globals.hpp revision 481:7d7a7c599c17
1/*
2 * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25#if !defined(COMPILER1) && !defined(COMPILER2)
26define_pd_global(bool, BackgroundCompilation,        false);
27define_pd_global(bool, UseTLAB,                      false);
28define_pd_global(bool, CICompileOSR,                 false);
29define_pd_global(bool, UseTypeProfile,               false);
30define_pd_global(bool, UseOnStackReplacement,        false);
31define_pd_global(bool, InlineIntrinsics,             false);
32define_pd_global(bool, PreferInterpreterNativeStubs, true);
33define_pd_global(bool, ProfileInterpreter,           false);
34define_pd_global(bool, ProfileTraps,                 false);
35define_pd_global(bool, TieredCompilation,            false);
36
37define_pd_global(intx, CompileThreshold,             0);
38define_pd_global(intx, Tier2CompileThreshold,        0);
39define_pd_global(intx, Tier3CompileThreshold,        0);
40define_pd_global(intx, Tier4CompileThreshold,        0);
41
42define_pd_global(intx, BackEdgeThreshold,            0);
43define_pd_global(intx, Tier2BackEdgeThreshold,       0);
44define_pd_global(intx, Tier3BackEdgeThreshold,       0);
45define_pd_global(intx, Tier4BackEdgeThreshold,       0);
46
47define_pd_global(intx, OnStackReplacePercentage,     0);
48define_pd_global(bool, ResizeTLAB,                   false);
49define_pd_global(intx, FreqInlineSize,               0);
50define_pd_global(intx, NewSizeThreadIncrease,        4*K);
51define_pd_global(intx, NewRatio,                     4);
52define_pd_global(intx, InlineClassNatives,           true);
53define_pd_global(intx, InlineUnsafeOps,              true);
54define_pd_global(intx, InitialCodeCacheSize,         160*K);
55define_pd_global(intx, ReservedCodeCacheSize,        32*M);
56define_pd_global(intx, CodeCacheExpansionSize,       32*K);
57define_pd_global(intx, CodeCacheMinBlockLength,      1);
58define_pd_global(uintx,PermSize,    ScaleForWordSize(4*M));
59define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
60define_pd_global(bool, NeverActAsServerClassMachine, true);
61define_pd_global(uintx, DefaultMaxRAM,               1*G);
62#define CI_COMPILER_COUNT 0
63#else
64
65#ifdef COMPILER2
66#define CI_COMPILER_COUNT 2
67#else
68#define CI_COMPILER_COUNT 1
69#endif // COMPILER2
70
71#endif // no compilers
72
73
74// string type aliases used only in this file
75typedef const char* ccstr;
76typedef const char* ccstrlist;   // represents string arguments which accumulate
77
78enum FlagValueOrigin {
79  DEFAULT          = 0,
80  COMMAND_LINE     = 1,
81  ENVIRON_VAR      = 2,
82  CONFIG_FILE      = 3,
83  MANAGEMENT       = 4,
84  ERGONOMIC        = 5,
85  ATTACH_ON_DEMAND = 6,
86  INTERNAL         = 99
87};
88
89struct Flag {
90  const char *type;
91  const char *name;
92  void*       addr;
93  const char *kind;
94  FlagValueOrigin origin;
95
96  // points to all Flags static array
97  static Flag *flags;
98
99  // number of flags
100  static size_t numFlags;
101
102  static Flag* find_flag(char* name, size_t length);
103
104  bool is_bool() const        { return strcmp(type, "bool") == 0; }
105  bool get_bool() const       { return *((bool*) addr); }
106  void set_bool(bool value)   { *((bool*) addr) = value; }
107
108  bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
109  intx get_intx() const       { return *((intx*) addr); }
110  void set_intx(intx value)   { *((intx*) addr) = value; }
111
112  bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
113  uintx get_uintx() const     { return *((uintx*) addr); }
114  void set_uintx(uintx value) { *((uintx*) addr) = value; }
115
116  bool is_double() const        { return strcmp(type, "double") == 0; }
117  double get_double() const     { return *((double*) addr); }
118  void set_double(double value) { *((double*) addr) = value; }
119
120  bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
121  bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
122  ccstr get_ccstr() const     { return *((ccstr*) addr); }
123  void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
124
125  bool is_unlocker() const;
126  bool is_unlocked() const;
127  bool is_writeable() const;
128  bool is_external() const;
129
130  void print_on(outputStream* st);
131  void print_as_flag(outputStream* st);
132};
133
134// debug flags control various aspects of the VM and are global accessible
135
136// use FlagSetting to temporarily change some debug flag
137// e.g. FlagSetting fs(DebugThisAndThat, true);
138// restored to previous value upon leaving scope
139class FlagSetting {
140  bool val;
141  bool* flag;
142 public:
143  FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
144  ~FlagSetting()                       { *flag = val; }
145};
146
147
148class CounterSetting {
149  intx* counter;
150 public:
151  CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
152  ~CounterSetting()         { (*counter)--; }
153};
154
155
156class IntFlagSetting {
157  intx val;
158  intx* flag;
159 public:
160  IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
161  ~IntFlagSetting()                       { *flag = val; }
162};
163
164
165class DoubleFlagSetting {
166  double val;
167  double* flag;
168 public:
169  DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
170  ~DoubleFlagSetting()                           { *flag = val; }
171};
172
173
174class CommandLineFlags {
175 public:
176  static bool boolAt(char* name, size_t len, bool* value);
177  static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
178  static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
179  static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
180
181  static bool intxAt(char* name, size_t len, intx* value);
182  static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
183  static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
184  static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
185
186  static bool uintxAt(char* name, size_t len, uintx* value);
187  static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
188  static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
189  static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
190
191  static bool doubleAt(char* name, size_t len, double* value);
192  static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
193  static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
194  static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
195
196  static bool ccstrAt(char* name, size_t len, ccstr* value);
197  static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
198  static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
199  static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
200
201  // Returns false if name is not a command line flag.
202  static bool wasSetOnCmdline(const char* name, bool* value);
203  static void printSetFlags();
204
205  static void printFlags() PRODUCT_RETURN;
206
207  static void verify() PRODUCT_RETURN;
208};
209
210// use this for flags that are true by default in the debug version but
211// false in the optimized version, and vice versa
212#ifdef ASSERT
213#define trueInDebug  true
214#define falseInDebug false
215#else
216#define trueInDebug  false
217#define falseInDebug true
218#endif
219
220// use this for flags that are true per default in the product build
221// but false in development builds, and vice versa
222#ifdef PRODUCT
223#define trueInProduct  true
224#define falseInProduct false
225#else
226#define trueInProduct  false
227#define falseInProduct true
228#endif
229
230// use this for flags that are true per default in the tiered build
231// but false in non-tiered builds, and vice versa
232#ifdef TIERED
233#define  trueInTiered true
234#define falseInTiered false
235#else
236#define  trueInTiered false
237#define falseInTiered true
238#endif
239
240// develop flags are settable / visible only during development and are constant in the PRODUCT version
241// product flags are always settable / visible
242// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
243
244// A flag must be declared with one of the following types:
245// bool, intx, uintx, ccstr.
246// The type "ccstr" is an alias for "const char*" and is used
247// only in this file, because the macrology requires single-token type names.
248
249// Note: Diagnostic options not meant for VM tuning or for product modes.
250// They are to be used for VM quality assurance or field diagnosis
251// of VM bugs.  They are hidden so that users will not be encouraged to
252// try them as if they were VM ordinary execution options.  However, they
253// are available in the product version of the VM.  Under instruction
254// from support engineers, VM customers can turn them on to collect
255// diagnostic information about VM problems.  To use a VM diagnostic
256// option, you must first specify +UnlockDiagnosticVMOptions.
257// (This master switch also affects the behavior of -Xprintflags.)
258//
259// experimental flags are in support of features that are not
260//    part of the officially supported product, but are available
261//    for experimenting with. They could, for example, be performance
262//    features that may not have undergone full or rigorous QA, but which may
263//    help performance in some cases and released for experimentation
264//    by the community of users and developers. This flag also allows one to
265//    be able to build a fully supported product that nonetheless also
266//    ships with some unsupported, lightly tested, experimental features.
267//    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
268//    UnlockExperimentalVMOptions flag, which allows the control and
269//    modification of the experimental flags.
270//
271// manageable flags are writeable external product flags.
272//    They are dynamically writeable through the JDK management interface
273//    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
274//    These flags are external exported interface (see CCC).  The list of
275//    manageable flags can be queried programmatically through the management
276//    interface.
277//
278//    A flag can be made as "manageable" only if
279//    - the flag is defined in a CCC as an external exported interface.
280//    - the VM implementation supports dynamic setting of the flag.
281//      This implies that the VM must *always* query the flag variable
282//      and not reuse state related to the flag state at any given time.
283//    - you want the flag to be queried programmatically by the customers.
284//
285// product_rw flags are writeable internal product flags.
286//    They are like "manageable" flags but for internal/private use.
287//    The list of product_rw flags are internal/private flags which
288//    may be changed/removed in a future release.  It can be set
289//    through the management interface to get/set value
290//    when the name of flag is supplied.
291//
292//    A flag can be made as "product_rw" only if
293//    - the VM implementation supports dynamic setting of the flag.
294//      This implies that the VM must *always* query the flag variable
295//      and not reuse state related to the flag state at any given time.
296//
297// Note that when there is a need to support develop flags to be writeable,
298// it can be done in the same way as product_rw.
299
300#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
301                                                                            \
302  lp64_product(bool, UseCompressedOops, false,                              \
303            "Use 32-bit object references in 64-bit VM. "                   \
304            "lp64_product means flag is always constant in 32 bit VM")      \
305                                                                            \
306  lp64_product(bool, CheckCompressedOops, trueInDebug,                      \
307            "generate checks in encoding/decoding code")                    \
308                                                                            \
309  product(bool, UseImplicitNullCheckForNarrowOop, true,                     \
310            "generate implicit null check in indexed addressing mode.")     \
311                                                                            \
312  /* UseMembar is theoretically a temp flag used for memory barrier         \
313   * removal testing.  It was supposed to be removed before FCS but has     \
314   * been re-added (see 6401008) */                                         \
315  product(bool, UseMembar, false,                                           \
316          "(Unstable) Issues membars on thread state transitions")          \
317                                                                            \
318  product(bool, PrintCommandLineFlags, false,                               \
319          "Prints flags that appeared on the command line")                 \
320                                                                            \
321  diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
322          "Enable normal processing of flags relating to field diagnostics")\
323                                                                            \
324  experimental(bool, UnlockExperimentalVMOptions, false,                    \
325          "Enable normal processing of flags relating to experimental features")\
326                                                                            \
327  product(bool, JavaMonitorsInStackTrace, true,                             \
328          "Print info. about Java monitor locks when the stacks are dumped")\
329                                                                            \
330  product_pd(bool, UseLargePages,                                           \
331          "Use large page memory")                                          \
332                                                                            \
333  product_pd(bool, UseLargePagesIndividualAllocation,                       \
334          "Allocate large pages individually for better affinity")          \
335                                                                            \
336  develop(bool, LargePagesIndividualAllocationInjectError, false,           \
337          "Fail large pages individual allocation")                         \
338                                                                            \
339  develop(bool, TracePageSizes, false,                                      \
340          "Trace page size selection and usage.")                           \
341                                                                            \
342  product(bool, UseNUMA, false,                                             \
343          "Use NUMA if available")                                          \
344                                                                            \
345  product(bool, ForceNUMA, false,                                           \
346          "Force NUMA optimizations on single-node/UMA systems")            \
347                                                                            \
348  product(intx, NUMAChunkResizeWeight, 20,                                  \
349          "Percentage (0-100) used to weight the current sample when "      \
350          "computing exponentially decaying average for "                   \
351          "AdaptiveNUMAChunkSizing")                                        \
352                                                                            \
353  product(intx, NUMASpaceResizeRate, 1*G,                                   \
354          "Do not reallocate more that this amount per collection")         \
355                                                                            \
356  product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
357          "Enable adaptive chunk sizing for NUMA")                          \
358                                                                            \
359  product(bool, NUMAStats, false,                                           \
360          "Print NUMA stats in detailed heap information")                  \
361                                                                            \
362  product(intx, NUMAPageScanRate, 256,                                      \
363          "Maximum number of pages to include in the page scan procedure")  \
364                                                                            \
365  product_pd(bool, NeedsDeoptSuspend,                                       \
366          "True for register window machines (sparc/ia64)")                 \
367                                                                            \
368  product(intx, UseSSE, 99,                                                 \
369          "Highest supported SSE instructions set on x86/x64")              \
370                                                                            \
371  product(uintx, LargePageSizeInBytes, 0,                                   \
372          "Large page size (0 to let VM choose the page size")              \
373                                                                            \
374  product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
375          "Use large pages if max heap is at least this big")               \
376                                                                            \
377  product(bool, ForceTimeHighResolution, false,                             \
378          "Using high time resolution(For Win32 only)")                     \
379                                                                            \
380  develop(bool, TraceItables, false,                                        \
381          "Trace initialization and use of itables")                        \
382                                                                            \
383  develop(bool, TracePcPatching, false,                                     \
384          "Trace usage of frame::patch_pc")                                 \
385                                                                            \
386  develop(bool, TraceJumps, false,                                          \
387          "Trace assembly jumps in thread ring buffer")                     \
388                                                                            \
389  develop(bool, TraceRelocator, false,                                      \
390          "Trace the bytecode relocator")                                   \
391                                                                            \
392  develop(bool, TraceLongCompiles, false,                                   \
393          "Print out every time compilation is longer than "                \
394          "a given threashold")                                             \
395                                                                            \
396  develop(bool, SafepointALot, false,                                       \
397          "Generates a lot of safepoints. Works with "                      \
398          "GuaranteedSafepointInterval")                                    \
399                                                                            \
400  product_pd(bool, BackgroundCompilation,                                   \
401          "A thread requesting compilation is not blocked during "          \
402          "compilation")                                                    \
403                                                                            \
404  product(bool, PrintVMQWaitTime, false,                                    \
405          "Prints out the waiting time in VM operation queue")              \
406                                                                            \
407  develop(bool, BailoutToInterpreterForThrows, false,                       \
408          "Compiled methods which throws/catches exceptions will be "       \
409          "deopt and intp.")                                                \
410                                                                            \
411  develop(bool, NoYieldsInMicrolock, false,                                 \
412          "Disable yields in microlock")                                    \
413                                                                            \
414  develop(bool, TraceOopMapGeneration, false,                               \
415          "Shows oopmap generation")                                        \
416                                                                            \
417  product(bool, MethodFlushing, true,                                       \
418          "Reclamation of zombie and not-entrant methods")                  \
419                                                                            \
420  develop(bool, VerifyStack, false,                                         \
421          "Verify stack of each thread when it is entering a runtime call") \
422                                                                            \
423  develop(bool, ForceUnreachable, false,                                    \
424          "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
425                                                                            \
426  notproduct(bool, StressDerivedPointers, false,                            \
427          "Force scavenge when a derived pointers is detected on stack "    \
428          "after rtm call")                                                 \
429                                                                            \
430  develop(bool, TraceDerivedPointers, false,                                \
431          "Trace traversal of derived pointers on stack")                   \
432                                                                            \
433  notproduct(bool, TraceCodeBlobStacks, false,                              \
434          "Trace stack-walk of codeblobs")                                  \
435                                                                            \
436  product(bool, PrintJNIResolving, false,                                   \
437          "Used to implement -v:jni")                                       \
438                                                                            \
439  notproduct(bool, PrintRewrites, false,                                    \
440          "Print methods that are being rewritten")                         \
441                                                                            \
442  product(bool, UseInlineCaches, true,                                      \
443          "Use Inline Caches for virtual calls ")                           \
444                                                                            \
445  develop(bool, InlineArrayCopy, true,                                      \
446          "inline arraycopy native that is known to be part of "            \
447          "base library DLL")                                               \
448                                                                            \
449  develop(bool, InlineObjectHash, true,                                     \
450          "inline Object::hashCode() native that is known to be part "      \
451          "of base library DLL")                                            \
452                                                                            \
453  develop(bool, InlineObjectCopy, true,                                     \
454          "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
455                                                                            \
456  develop(bool, InlineNatives, true,                                        \
457          "inline natives that are known to be part of base library DLL")   \
458                                                                            \
459  develop(bool, InlineMathNatives, true,                                    \
460          "inline SinD, CosD, etc.")                                        \
461                                                                            \
462  develop(bool, InlineClassNatives, true,                                   \
463          "inline Class.isInstance, etc")                                   \
464                                                                            \
465  develop(bool, InlineAtomicLong, true,                                     \
466          "inline sun.misc.AtomicLong")                                     \
467                                                                            \
468  develop(bool, InlineThreadNatives, true,                                  \
469          "inline Thread.currentThread, etc")                               \
470                                                                            \
471  develop(bool, InlineReflectionGetCallerClass, true,                       \
472          "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
473          "of base library DLL")                                            \
474                                                                            \
475  develop(bool, InlineUnsafeOps, true,                                      \
476          "inline memory ops (native methods) from sun.misc.Unsafe")        \
477                                                                            \
478  develop(bool, ConvertCmpD2CmpF, true,                                     \
479          "Convert cmpD to cmpF when one input is constant in float range") \
480                                                                            \
481  develop(bool, ConvertFloat2IntClipping, true,                             \
482          "Convert float2int clipping idiom to integer clipping")           \
483                                                                            \
484  develop(bool, SpecialStringCompareTo, true,                               \
485          "special version of string compareTo")                            \
486                                                                            \
487  develop(bool, SpecialStringIndexOf, true,                                 \
488          "special version of string indexOf")                              \
489                                                                            \
490  product(bool, SpecialArraysEquals, false,                                 \
491          "special version of Arrays.equals(char[],char[])")                \
492                                                                            \
493  develop(bool, TraceCallFixup, false,                                      \
494          "traces all call fixups")                                         \
495                                                                            \
496  develop(bool, DeoptimizeALot, false,                                      \
497          "deoptimize at every exit from the runtime system")               \
498                                                                            \
499  notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
500          "a comma separated list of bcis to deoptimize at")                \
501                                                                            \
502  product(bool, DeoptimizeRandom, false,                                    \
503          "deoptimize random frames on random exit from the runtime system")\
504                                                                            \
505  notproduct(bool, ZombieALot, false,                                       \
506          "creates zombies (non-entrant) at exit from the runt. system")    \
507                                                                            \
508  notproduct(bool, WalkStackALot, false,                                    \
509          "trace stack (no print) at every exit from the runtime system")   \
510                                                                            \
511  develop(bool, Debugging, false,                                           \
512          "set when executing debug methods in debug.ccp "                  \
513          "(to prevent triggering assertions)")                             \
514                                                                            \
515  notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
516          "Enable strict checks that safepoints cannot happen for threads " \
517          "that used No_Safepoint_Verifier")                                \
518                                                                            \
519  notproduct(bool, VerifyLastFrame, false,                                  \
520          "Verify oops on last frame on entry to VM")                       \
521                                                                            \
522  develop(bool, TraceHandleAllocation, false,                               \
523          "Prints out warnings when suspicious many handles are allocated") \
524                                                                            \
525  product(bool, UseCompilerSafepoints, true,                                \
526          "Stop at safepoints in compiled code")                            \
527                                                                            \
528  product(bool, UseSplitVerifier, true,                                     \
529          "use split verifier with StackMapTable attributes")               \
530                                                                            \
531  product(bool, FailOverToOldVerifier, true,                                \
532          "fail over to old verifier when split verifier fails")            \
533                                                                            \
534  develop(bool, ShowSafepointMsgs, false,                                   \
535          "Show msg. about safepoint synch.")                               \
536                                                                            \
537  product(bool, SafepointTimeout, false,                                    \
538          "Time out and warn or fail after SafepointTimeoutDelay "          \
539          "milliseconds if failed to reach safepoint")                      \
540                                                                            \
541  develop(bool, DieOnSafepointTimeout, false,                               \
542          "Die upon failure to reach safepoint (see SafepointTimeout)")     \
543                                                                            \
544  /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
545  /* typically, at most a few retries are needed */                         \
546  product(intx, SuspendRetryCount, 50,                                      \
547          "Maximum retry count for an external suspend request")            \
548                                                                            \
549  product(intx, SuspendRetryDelay, 5,                                       \
550          "Milliseconds to delay per retry (* current_retry_count)")        \
551                                                                            \
552  product(bool, AssertOnSuspendWaitFailure, false,                          \
553          "Assert/Guarantee on external suspend wait failure")              \
554                                                                            \
555  product(bool, TraceSuspendWaitFailures, false,                            \
556          "Trace external suspend wait failures")                           \
557                                                                            \
558  product(bool, MaxFDLimit, true,                                           \
559          "Bump the number of file descriptors to max in solaris.")         \
560                                                                            \
561  notproduct(bool, LogEvents, trueInDebug,                                  \
562          "Enable Event log")                                               \
563                                                                            \
564  product(bool, BytecodeVerificationRemote, true,                           \
565          "Enables the Java bytecode verifier for remote classes")          \
566                                                                            \
567  product(bool, BytecodeVerificationLocal, false,                           \
568          "Enables the Java bytecode verifier for local classes")           \
569                                                                            \
570  develop(bool, ForceFloatExceptions, trueInDebug,                          \
571          "Force exceptions on FP stack under/overflow")                    \
572                                                                            \
573  develop(bool, SoftMatchFailure, trueInProduct,                            \
574          "If the DFA fails to match a node, print a message and bail out") \
575                                                                            \
576  develop(bool, VerifyStackAtCalls, false,                                  \
577          "Verify that the stack pointer is unchanged after calls")         \
578                                                                            \
579  develop(bool, TraceJavaAssertions, false,                                 \
580          "Trace java language assertions")                                 \
581                                                                            \
582  notproduct(bool, CheckAssertionStatusDirectives, false,                   \
583          "temporary - see javaClasses.cpp")                                \
584                                                                            \
585  notproduct(bool, PrintMallocFree, false,                                  \
586          "Trace calls to C heap malloc/free allocation")                   \
587                                                                            \
588  notproduct(bool, PrintOopAddress, false,                                  \
589          "Always print the location of the oop")                           \
590                                                                            \
591  notproduct(bool, VerifyCodeCacheOften, false,                             \
592          "Verify compiled-code cache often")                               \
593                                                                            \
594  develop(bool, ZapDeadCompiledLocals, false,                               \
595          "Zap dead locals in compiler frames")                             \
596                                                                            \
597  notproduct(bool, ZapDeadLocalsOld, false,                                 \
598          "Zap dead locals (old version, zaps all frames when "             \
599          "entering the VM")                                                \
600                                                                            \
601  notproduct(bool, CheckOopishValues, false,                                \
602          "Warn if value contains oop ( requires ZapDeadLocals)")           \
603                                                                            \
604  develop(bool, UseMallocOnly, false,                                       \
605          "use only malloc/free for allocation (no resource area/arena)")   \
606                                                                            \
607  develop(bool, PrintMalloc, false,                                         \
608          "print all malloc/free calls")                                    \
609                                                                            \
610  develop(bool, ZapResourceArea, trueInDebug,                               \
611          "Zap freed resource/arena space with 0xABABABAB")                 \
612                                                                            \
613  notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
614          "Zap freed VM handle space with 0xBCBCBCBC")                      \
615                                                                            \
616  develop(bool, ZapJNIHandleArea, trueInDebug,                              \
617          "Zap freed JNI handle space with 0xFEFEFEFE")                     \
618                                                                            \
619  develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
620          "Zap unused heap space with 0xBAADBABE")                          \
621                                                                            \
622  develop(bool, TraceZapUnusedHeapArea, false,                              \
623          "Trace zapping of unused heap space")                             \
624                                                                            \
625  develop(bool, CheckZapUnusedHeapArea, false,                              \
626          "Check zapping of unused heap space")                             \
627                                                                            \
628  develop(bool, ZapFillerObjects, trueInDebug,                              \
629          "Zap filler objects with 0xDEAFBABE")                             \
630                                                                            \
631  develop(bool, PrintVMMessages, true,                                      \
632          "Print vm messages on console")                                   \
633                                                                            \
634  product(bool, PrintGCApplicationConcurrentTime, false,                    \
635          "Print the time the application has been running")                \
636                                                                            \
637  product(bool, PrintGCApplicationStoppedTime, false,                       \
638          "Print the time the application has been stopped")                \
639                                                                            \
640  develop(bool, Verbose, false,                                             \
641          "Prints additional debugging information from other modes")       \
642                                                                            \
643  develop(bool, PrintMiscellaneous, false,                                  \
644          "Prints uncategorized debugging information (requires +Verbose)") \
645                                                                            \
646  develop(bool, WizardMode, false,                                          \
647          "Prints much more debugging information")                         \
648                                                                            \
649  product(bool, ShowMessageBoxOnError, false,                               \
650          "Keep process alive on VM fatal error")                           \
651                                                                            \
652  product_pd(bool, UseOSErrorReporting,                                     \
653          "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
654                                                                            \
655  product(bool, SuppressFatalErrorMessage, false,                           \
656          "Do NO Fatal Error report [Avoid deadlock]")                      \
657                                                                            \
658  product(ccstrlist, OnError, "",                                           \
659          "Run user-defined commands on fatal error; see VMError.cpp "      \
660          "for examples")                                                   \
661                                                                            \
662  product(ccstrlist, OnOutOfMemoryError, "",                                \
663          "Run user-defined commands on first java.lang.OutOfMemoryError")  \
664                                                                            \
665  manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
666          "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
667                                                                            \
668  manageable(ccstr, HeapDumpPath, NULL,                                     \
669          "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
670          "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
671          "in the working directory)")                                      \
672                                                                            \
673  develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
674          "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
675          "when the heap usage is larger than this")                        \
676                                                                            \
677  develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
678          "Approximate segment size when generating a segmented heap dump") \
679                                                                            \
680  develop(bool, BreakAtWarning, false,                                      \
681          "Execute breakpoint upon encountering VM warning")                \
682                                                                            \
683  product_pd(bool, UseVectoredExceptions,                                   \
684          "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
685                                                                            \
686  develop(bool, TraceVMOperation, false,                                    \
687          "Trace vm operations")                                            \
688                                                                            \
689  develop(bool, UseFakeTimers, false,                                       \
690          "Tells whether the VM should use system time or a fake timer")    \
691                                                                            \
692  diagnostic(bool, LogCompilation, false,                                   \
693          "Log compilation activity in detail to hotspot.log or LogFile")   \
694                                                                            \
695  product(bool, PrintCompilation, false,                                    \
696          "Print compilations")                                             \
697                                                                            \
698  diagnostic(bool, TraceNMethodInstalls, false,                             \
699             "Trace nmethod intallation")                                   \
700                                                                            \
701  diagnostic(bool, TraceOSRBreakpoint, false,                               \
702             "Trace OSR Breakpoint ")                                       \
703                                                                            \
704  diagnostic(bool, TraceCompileTriggered, false,                            \
705             "Trace compile triggered")                                     \
706                                                                            \
707  diagnostic(bool, TraceTriggers, false,                                    \
708             "Trace triggers")                                              \
709                                                                            \
710  product(bool, AlwaysRestoreFPU, false,                                    \
711          "Restore the FPU control word after every JNI call (expensive)")  \
712                                                                            \
713  notproduct(bool, PrintCompilation2, false,                                \
714          "Print additional statistics per compilation")                    \
715                                                                            \
716  diagnostic(bool, PrintAdapterHandlers, false,                             \
717          "Print code generated for i2c/c2i adapters")                      \
718                                                                            \
719  diagnostic(bool, PrintAssembly, false,                                    \
720          "Print assembly code (using external disassembler.so)")           \
721                                                                            \
722  diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
723          "Options string passed to disassembler.so")                       \
724                                                                            \
725  diagnostic(bool, PrintNMethods, false,                                    \
726          "Print assembly code for nmethods when generated")                \
727                                                                            \
728  diagnostic(bool, PrintNativeNMethods, false,                              \
729          "Print assembly code for native nmethods when generated")         \
730                                                                            \
731  develop(bool, PrintDebugInfo, false,                                      \
732          "Print debug information for all nmethods when generated")        \
733                                                                            \
734  develop(bool, PrintRelocations, false,                                    \
735          "Print relocation information for all nmethods when generated")   \
736                                                                            \
737  develop(bool, PrintDependencies, false,                                   \
738          "Print dependency information for all nmethods when generated")   \
739                                                                            \
740  develop(bool, PrintExceptionHandlers, false,                              \
741          "Print exception handler tables for all nmethods when generated") \
742                                                                            \
743  develop(bool, InterceptOSException, false,                                \
744          "Starts debugger when an implicit OS (e.g., NULL) "               \
745          "exception happens")                                              \
746                                                                            \
747  notproduct(bool, PrintCodeCache, false,                                   \
748          "Print the compiled_code cache when exiting")                     \
749                                                                            \
750  develop(bool, PrintCodeCache2, false,                                     \
751          "Print detailed info on the compiled_code cache when exiting")    \
752                                                                            \
753  diagnostic(bool, PrintStubCode, false,                                    \
754          "Print generated stub code")                                      \
755                                                                            \
756  product(bool, StackTraceInThrowable, true,                                \
757          "Collect backtrace in throwable when exception happens")          \
758                                                                            \
759  product(bool, OmitStackTraceInFastThrow, true,                            \
760          "Omit backtraces for some 'hot' exceptions in optimized code")    \
761                                                                            \
762  product(bool, ProfilerPrintByteCodeStatistics, false,                     \
763          "Prints byte code statictics when dumping profiler output")       \
764                                                                            \
765  product(bool, ProfilerRecordPC, false,                                    \
766          "Collects tick for each 16 byte interval of compiled code")       \
767                                                                            \
768  product(bool, ProfileVM,  false,                                          \
769          "Profiles ticks that fall within VM (either in the VM Thread "    \
770          "or VM code called through stubs)")                               \
771                                                                            \
772  product(bool, ProfileIntervals, false,                                    \
773          "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
774                                                                            \
775  notproduct(bool, ProfilerCheckIntervals, false,                           \
776          "Collect and print info on spacing of profiler ticks")            \
777                                                                            \
778  develop(bool, PrintJVMWarnings, false,                                    \
779          "Prints warnings for unimplemented JVM functions")                \
780                                                                            \
781  notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
782          "Prints warnings for stalled SpinLocks")                          \
783                                                                            \
784  develop(bool, InitializeJavaLangSystem, true,                             \
785          "Initialize java.lang.System - turn off for individual "          \
786          "method debugging")                                               \
787                                                                            \
788  develop(bool, InitializeJavaLangString, true,                             \
789          "Initialize java.lang.String - turn off for individual "          \
790          "method debugging")                                               \
791                                                                            \
792  develop(bool, InitializeJavaLangExceptionsErrors, true,                   \
793          "Initialize various error and exception classes - turn off for "  \
794          "individual method debugging")                                    \
795                                                                            \
796  product(bool, RegisterFinalizersAtInit, true,                             \
797          "Register finalizable objects at end of Object.<init> or "        \
798          "after allocation.")                                              \
799                                                                            \
800  develop(bool, RegisterReferences, true,                                   \
801          "Tells whether the VM should register soft/weak/final/phantom "   \
802          "references")                                                     \
803                                                                            \
804  develop(bool, IgnoreRewrites, false,                                      \
805          "Supress rewrites of bytecodes in the oopmap generator. "         \
806          "This is unsafe!")                                                \
807                                                                            \
808  develop(bool, PrintCodeCacheExtension, false,                             \
809          "Print extension of code cache")                                  \
810                                                                            \
811  develop(bool, UsePrivilegedStack, true,                                   \
812          "Enable the security JVM functions")                              \
813                                                                            \
814  develop(bool, IEEEPrecision, true,                                        \
815          "Enables IEEE precision (for INTEL only)")                        \
816                                                                            \
817  develop(bool, ProtectionDomainVerification, true,                         \
818          "Verifies protection domain before resolution in system "         \
819          "dictionary")                                                     \
820                                                                            \
821  product(bool, ClassUnloading, true,                                       \
822          "Do unloading of classes")                                        \
823                                                                            \
824  diagnostic(bool, LinkWellKnownClasses, true,                              \
825          "Resolve a well known class as soon as its name is seen")         \
826                                                                            \
827  develop(bool, DisableStartThread, false,                                  \
828          "Disable starting of additional Java threads "                    \
829          "(for debugging only)")                                           \
830                                                                            \
831  develop(bool, MemProfiling, false,                                        \
832          "Write memory usage profiling to log file")                       \
833                                                                            \
834  notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
835          "Prints the system dictionary at exit")                           \
836                                                                            \
837  diagnostic(bool, UnsyncloadClass, false,                                  \
838          "Unstable: VM calls loadClass unsynchronized. Custom classloader "\
839          "must call VM synchronized for findClass & defineClass")          \
840                                                                            \
841  product_pd(bool, DontYieldALot,                                           \
842          "Throw away obvious excess yield calls (for SOLARIS only)")       \
843                                                                            \
844  product_pd(bool, ConvertSleepToYield,                                     \
845          "Converts sleep(0) to thread yield "                              \
846          "(may be off for SOLARIS to improve GUI)")                        \
847                                                                            \
848  product(bool, ConvertYieldToSleep, false,                                 \
849          "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
850          "behavior (SOLARIS only)")                                        \
851                                                                            \
852  product(bool, UseBoundThreads, true,                                      \
853          "Bind user level threads to kernel threads (for SOLARIS only)")   \
854                                                                            \
855  develop(bool, UseDetachedThreads, true,                                   \
856          "Use detached threads that are recycled upon termination "        \
857          "(for SOLARIS only)")                                             \
858                                                                            \
859  product(bool, UseLWPSynchronization, true,                                \
860          "Use LWP-based instead of libthread-based synchronization "       \
861          "(SPARC only)")                                                   \
862                                                                            \
863  product(ccstr, SyncKnobs, NULL,                                           \
864          "(Unstable) Various monitor synchronization tunables")            \
865                                                                            \
866  product(intx, EmitSync, 0,                                                \
867          "(Unsafe,Unstable) "                                              \
868          " Controls emission of inline sync fast-path code")               \
869                                                                            \
870  product(intx, AlwaysInflate, 0, "(Unstable) Force inflation")             \
871                                                                            \
872  product(intx, Atomics, 0,                                                 \
873          "(Unsafe,Unstable) Diagnostic - Controls emission of atomics")    \
874                                                                            \
875  product(intx, FenceInstruction, 0,                                        \
876          "(Unsafe,Unstable) Experimental")                                 \
877                                                                            \
878  product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
879                                                                            \
880  product(intx, SyncVerbose, 0, "(Unstable)" )                              \
881                                                                            \
882  product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
883                                                                            \
884  product(intx, hashCode, 0,                                                \
885         "(Unstable) select hashCode generation algorithm" )                \
886                                                                            \
887  product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
888         "(Unstable, Linux-specific)"                                       \
889         " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
890                                                                            \
891  product(bool, FilterSpuriousWakeups , true,                               \
892          "Prevent spurious or premature wakeups from object.wait"              \
893          "(Solaris only)")                                                     \
894                                                                            \
895  product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
896  product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
897  product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
898                                                                            \
899  develop(bool, UsePthreads, false,                                         \
900          "Use pthread-based instead of libthread-based synchronization "   \
901          "(SPARC only)")                                                   \
902                                                                            \
903  product(bool, AdjustConcurrency, false,                                   \
904          "call thr_setconcurrency at thread create time to avoid "         \
905          "LWP starvation on MP systems (For Solaris Only)")                \
906                                                                            \
907  develop(bool, UpdateHotSpotCompilerFileOnError, true,                     \
908          "Should the system attempt to update the compiler file when "     \
909          "an error occurs?")                                               \
910                                                                            \
911  product(bool, ReduceSignalUsage, false,                                   \
912          "Reduce the use of OS signals in Java and/or the VM")             \
913                                                                            \
914  notproduct(bool, ValidateMarkSweep, false,                                \
915          "Do extra validation during MarkSweep collection")                \
916                                                                            \
917  notproduct(bool, RecordMarkSweepCompaction, false,                        \
918          "Enable GC-to-GC recording and querying of compaction during "    \
919          "MarkSweep")                                                      \
920                                                                            \
921  develop_pd(bool, ShareVtableStubs,                                        \
922          "Share vtable stubs (smaller code but worse branch prediction")   \
923                                                                            \
924  develop(bool, LoadLineNumberTables, true,                                 \
925          "Tells whether the class file parser loads line number tables")   \
926                                                                            \
927  develop(bool, LoadLocalVariableTables, true,                              \
928          "Tells whether the class file parser loads local variable tables")\
929                                                                            \
930  develop(bool, LoadLocalVariableTypeTables, true,                          \
931          "Tells whether the class file parser loads local variable type tables")\
932                                                                            \
933  product(bool, AllowUserSignalHandlers, false,                             \
934          "Do not complain if the application installs signal handlers "    \
935          "(Solaris & Linux only)")                                         \
936                                                                            \
937  product(bool, UseSignalChaining, true,                                    \
938          "Use signal-chaining to invoke signal handlers installed "        \
939          "by the application (Solaris & Linux only)")                      \
940                                                                            \
941  product(bool, UseAltSigs, false,                                          \
942          "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
943          "internal signals. (Solaris only)")                               \
944                                                                            \
945  product(bool, UseSpinning, false,                                         \
946          "Use spinning in monitor inflation and before entry")             \
947                                                                            \
948  product(bool, PreSpinYield, false,                                        \
949          "Yield before inner spinning loop")                               \
950                                                                            \
951  product(bool, PostSpinYield, true,                                        \
952          "Yield after inner spinning loop")                                \
953                                                                            \
954  product(bool, AllowJNIEnvProxy, false,                                    \
955          "Allow JNIEnv proxies for jdbx")                                  \
956                                                                            \
957  product(bool, JNIDetachReleasesMonitors, true,                            \
958          "JNI DetachCurrentThread releases monitors owned by thread")      \
959                                                                            \
960  product(bool, RestoreMXCSROnJNICalls, false,                              \
961          "Restore MXCSR when returning from JNI calls")                    \
962                                                                            \
963  product(bool, CheckJNICalls, false,                                       \
964          "Verify all arguments to JNI calls")                              \
965                                                                            \
966  product(bool, UseFastJNIAccessors, true,                                  \
967          "Use optimized versions of Get<Primitive>Field")                  \
968                                                                            \
969  product(bool, EagerXrunInit, false,                                       \
970          "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
971          " but not all -Xrun libraries may support the state of the VM at this time") \
972                                                                            \
973  product(bool, PreserveAllAnnotations, false,                              \
974          "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
975                                                                            \
976  develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
977          "Number of OutOfMemoryErrors preallocated with backtrace")        \
978                                                                            \
979  product(bool, LazyBootClassLoader, true,                                  \
980          "Enable/disable lazy opening of boot class path entries")         \
981                                                                            \
982  diagnostic(bool, UseIncDec, true,                                         \
983          "Use INC, DEC instructions on x86")                               \
984                                                                            \
985  product(bool, UseNewLongLShift, false,                                    \
986          "Use optimized bitwise shift left")                               \
987                                                                            \
988  product(bool, UseStoreImmI16, true,                                       \
989          "Use store immediate 16-bits value instruction on x86")           \
990                                                                            \
991  product(bool, UseAddressNop, false,                                       \
992          "Use '0F 1F [addr]' NOP instructions on x86 cpus")                \
993                                                                            \
994  product(bool, UseXmmLoadAndClearUpper, true,                              \
995          "Load low part of XMM register and clear upper part")             \
996                                                                            \
997  product(bool, UseXmmRegToRegMoveAll, false,                               \
998          "Copy all XMM register bits when moving value between registers") \
999                                                                            \
1000  product(bool, UseXmmI2D, false,                                           \
1001          "Use SSE2 CVTDQ2PD instruction to convert Integer to Double")     \
1002                                                                            \
1003  product(bool, UseXmmI2F, false,                                           \
1004          "Use SSE2 CVTDQ2PS instruction to convert Integer to Float")      \
1005                                                                            \
1006  product(bool, UseXMMForArrayCopy, false,                                  \
1007          "Use SSE2 MOVQ instruction for Arraycopy")                        \
1008                                                                            \
1009  product(bool, UseUnalignedLoadStores, false,                              \
1010          "Use SSE2 MOVDQU instruction for Arraycopy")                      \
1011                                                                            \
1012  product(intx, FieldsAllocationStyle, 1,                                   \
1013          "0 - type based with oops first, 1 - with oops last")             \
1014                                                                            \
1015  product(bool, CompactFields, true,                                        \
1016          "Allocate nonstatic fields in gaps between previous fields")      \
1017                                                                            \
1018  notproduct(bool, PrintCompactFieldsSavings, false,                        \
1019          "Print how many words were saved with CompactFields")             \
1020                                                                            \
1021  product(bool, UseBiasedLocking, true,                                     \
1022          "Enable biased locking in JVM")                                   \
1023                                                                            \
1024  product(intx, BiasedLockingStartupDelay, 4000,                            \
1025          "Number of milliseconds to wait before enabling biased locking")  \
1026                                                                            \
1027  diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1028          "Print statistics of biased locking in JVM")                      \
1029                                                                            \
1030  product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1031          "Threshold of number of revocations per type to try to "          \
1032          "rebias all objects in the heap of that type")                    \
1033                                                                            \
1034  product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1035          "Threshold of number of revocations per type to permanently "     \
1036          "revoke biases of all objects in the heap of that type")          \
1037                                                                            \
1038  product(intx, BiasedLockingDecayTime, 25000,                              \
1039          "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1040          "type after previous bulk rebias")                                \
1041                                                                            \
1042  /* tracing */                                                             \
1043                                                                            \
1044  notproduct(bool, TraceRuntimeCalls, false,                                \
1045          "Trace run-time calls")                                           \
1046                                                                            \
1047  develop(bool, TraceJNICalls, false,                                       \
1048          "Trace JNI calls")                                                \
1049                                                                            \
1050  notproduct(bool, TraceJVMCalls, false,                                    \
1051          "Trace JVM calls")                                                \
1052                                                                            \
1053  product(ccstr, TraceJVMTI, NULL,                                          \
1054          "Trace flags for JVMTI functions and events")                     \
1055                                                                            \
1056  /* This option can change an EMCP method into an obsolete method. */      \
1057  /* This can affect tests that except specific methods to be EMCP. */      \
1058  /* This option should be used with caution. */                            \
1059  product(bool, StressLdcRewrite, false,                                    \
1060          "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1061                                                                            \
1062  product(intx, TraceRedefineClasses, 0,                                    \
1063          "Trace level for JVMTI RedefineClasses")                          \
1064                                                                            \
1065  /* change to false by default sometime after Mustang */                   \
1066  product(bool, VerifyMergedCPBytecodes, true,                              \
1067          "Verify bytecodes after RedefineClasses constant pool merging")   \
1068                                                                            \
1069  develop(bool, TraceJNIHandleAllocation, false,                            \
1070          "Trace allocation/deallocation of JNI handle blocks")             \
1071                                                                            \
1072  develop(bool, TraceThreadEvents, false,                                   \
1073          "Trace all thread events")                                        \
1074                                                                            \
1075  develop(bool, TraceBytecodes, false,                                      \
1076          "Trace bytecode execution")                                       \
1077                                                                            \
1078  develop(bool, TraceClassInitialization, false,                            \
1079          "Trace class initialization")                                     \
1080                                                                            \
1081  develop(bool, TraceExceptions, false,                                     \
1082          "Trace exceptions")                                               \
1083                                                                            \
1084  develop(bool, TraceICs, false,                                            \
1085          "Trace inline cache changes")                                     \
1086                                                                            \
1087  notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1088          "Trace method invocation counter overflow")                       \
1089                                                                            \
1090  develop(bool, TraceInlineCacheClearing, false,                            \
1091          "Trace clearing of inline caches in nmethods")                    \
1092                                                                            \
1093  develop(bool, TraceDependencies, false,                                   \
1094          "Trace dependencies")                                             \
1095                                                                            \
1096  develop(bool, VerifyDependencies, trueInDebug,                            \
1097         "Exercise and verify the compilation dependency mechanism")        \
1098                                                                            \
1099  develop(bool, TraceNewOopMapGeneration, false,                            \
1100          "Trace OopMapGeneration")                                         \
1101                                                                            \
1102  develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1103          "Trace OopMapGeneration: print detailed cell states")             \
1104                                                                            \
1105  develop(bool, TimeOopMap, false,                                          \
1106          "Time calls to GenerateOopMap::compute_map() in sum")             \
1107                                                                            \
1108  develop(bool, TimeOopMap2, false,                                         \
1109          "Time calls to GenerateOopMap::compute_map() individually")       \
1110                                                                            \
1111  develop(bool, TraceMonitorMismatch, false,                                \
1112          "Trace monitor matching failures during OopMapGeneration")        \
1113                                                                            \
1114  develop(bool, TraceOopMapRewrites, false,                                 \
1115          "Trace rewritting of method oops during oop map generation")      \
1116                                                                            \
1117  develop(bool, TraceSafepoint, false,                                      \
1118          "Trace safepoint operations")                                     \
1119                                                                            \
1120  develop(bool, TraceICBuffer, false,                                       \
1121          "Trace usage of IC buffer")                                       \
1122                                                                            \
1123  develop(bool, TraceCompiledIC, false,                                     \
1124          "Trace changes of compiled IC")                                   \
1125                                                                            \
1126  notproduct(bool, TraceZapDeadLocals, false,                               \
1127          "Trace zapping dead locals")                                      \
1128                                                                            \
1129  develop(bool, TraceStartupTime, false,                                    \
1130          "Trace setup time")                                               \
1131                                                                            \
1132  develop(bool, TraceHPI, false,                                            \
1133          "Trace Host Porting Interface (HPI)")                             \
1134                                                                            \
1135  product(ccstr, HPILibPath, NULL,                                          \
1136          "Specify alternate path to HPI library")                          \
1137                                                                            \
1138  develop(bool, TraceProtectionDomainVerification, false,                   \
1139          "Trace protection domain verifcation")                            \
1140                                                                            \
1141  develop(bool, TraceClearedExceptions, false,                              \
1142          "Prints when an exception is forcibly cleared")                   \
1143                                                                            \
1144  product(bool, TraceClassResolution, false,                                \
1145          "Trace all constant pool resolutions (for debugging)")            \
1146                                                                            \
1147  product(bool, TraceBiasedLocking, false,                                  \
1148          "Trace biased locking in JVM")                                    \
1149                                                                            \
1150  product(bool, TraceMonitorInflation, false,                               \
1151          "Trace monitor inflation in JVM")                                 \
1152                                                                            \
1153  /* assembler */                                                           \
1154  product(bool, Use486InstrsOnly, false,                                    \
1155          "Use 80486 Compliant instruction subset")                         \
1156                                                                            \
1157  /* gc */                                                                  \
1158                                                                            \
1159  product(bool, UseSerialGC, false,                                         \
1160          "Use the serial garbage collector")                               \
1161                                                                            \
1162  experimental(bool, UseG1GC, false,                                        \
1163          "Use the Garbage-First garbage collector")                        \
1164                                                                            \
1165  product(bool, UseParallelGC, false,                                       \
1166          "Use the Parallel Scavenge garbage collector")                    \
1167                                                                            \
1168  product(bool, UseParallelOldGC, false,                                    \
1169          "Use the Parallel Old garbage collector")                         \
1170                                                                            \
1171  product(bool, UseParallelOldGCCompacting, true,                           \
1172          "In the Parallel Old garbage collector use parallel compaction")  \
1173                                                                            \
1174  product(bool, UseParallelDensePrefixUpdate, true,                         \
1175          "In the Parallel Old garbage collector use parallel dense"        \
1176          " prefix update")                                                 \
1177                                                                            \
1178  product(uintx, HeapMaximumCompactionInterval, 20,                         \
1179          "How often should we maximally compact the heap (not allowing "   \
1180          "any dead space)")                                                \
1181                                                                            \
1182  product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1183          "The collection count for the first maximum compaction")          \
1184                                                                            \
1185  product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1186          "In the Parallel Old garbage collector maximum compaction for "   \
1187          "a system GC")                                                    \
1188                                                                            \
1189  product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1190          "The mean used by the par compact dead wood"                      \
1191          "limiter (a number between 0-100).")                              \
1192                                                                            \
1193  product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1194          "The standard deviation used by the par compact dead wood"        \
1195          "limiter (a number between 0-100).")                              \
1196                                                                            \
1197  product(bool, UseParallelOldGCDensePrefix, true,                          \
1198          "Use a dense prefix with the Parallel Old garbage collector")     \
1199                                                                            \
1200  product(uintx, ParallelGCThreads, 0,                                      \
1201          "Number of parallel threads parallel gc will use")                \
1202                                                                            \
1203  product(uintx, ParallelCMSThreads, 0,                                     \
1204          "Max number of threads CMS will use for concurrent work")         \
1205                                                                            \
1206  develop(bool, ParallelOldMTUnsafeMarkBitMap, false,                       \
1207          "Use the Parallel Old MT unsafe in marking the bitmap")           \
1208                                                                            \
1209  develop(bool, ParallelOldMTUnsafeUpdateLiveData, false,                   \
1210          "Use the Parallel Old MT unsafe in update of live size")          \
1211                                                                            \
1212  develop(bool, TraceRegionTasksQueuing, false,                             \
1213          "Trace the queuing of the region tasks")                          \
1214                                                                            \
1215  product(uintx, ParallelMarkingThreads, 0,                                 \
1216          "Number of marking threads concurrent gc will use")               \
1217                                                                            \
1218  product(uintx, YoungPLABSize, 4096,                                       \
1219          "Size of young gen promotion labs (in HeapWords)")                \
1220                                                                            \
1221  product(uintx, OldPLABSize, 1024,                                         \
1222          "Size of old gen promotion labs (in HeapWords)")                  \
1223                                                                            \
1224  product(uintx, GCTaskTimeStampEntries, 200,                               \
1225          "Number of time stamp entries per gc worker thread")              \
1226                                                                            \
1227  product(bool, AlwaysTenure, false,                                        \
1228          "Always tenure objects in eden. (ParallelGC only)")               \
1229                                                                            \
1230  product(bool, NeverTenure, false,                                         \
1231          "Never tenure objects in eden, May tenure on overflow"            \
1232          " (ParallelGC only)")                                             \
1233                                                                            \
1234  product(bool, ScavengeBeforeFullGC, true,                                 \
1235          "Scavenge youngest generation before each full GC,"               \
1236          " used with UseParallelGC")                                       \
1237                                                                            \
1238  develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1239          "Allow scavenges to occur when to_space contains objects.")       \
1240                                                                            \
1241  product(bool, UseConcMarkSweepGC, false,                                  \
1242          "Use Concurrent Mark-Sweep GC in the old generation")             \
1243                                                                            \
1244  product(bool, ExplicitGCInvokesConcurrent, false,                         \
1245          "A System.gc() request invokes a concurrent collection;"          \
1246          " (effective only when UseConcMarkSweepGC)")                      \
1247                                                                            \
1248  product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1249          "A System.gc() request invokes a concurrent collection and"       \
1250          " also unloads classes during such a concurrent gc cycle  "       \
1251          " (effective only when UseConcMarkSweepGC)")                      \
1252                                                                            \
1253  develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1254          "Use Adaptive Free Lists in the CMS generation")                  \
1255                                                                            \
1256  develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1257          "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1258                                                                            \
1259  develop(bool, RotateCMSCollectionTypes, false,                            \
1260          "Rotate the CMS collections among concurrent and STW")            \
1261                                                                            \
1262  product(bool, UseCMSBestFit, true,                                        \
1263          "Use CMS best fit allocation strategy")                           \
1264                                                                            \
1265  product(bool, UseCMSCollectionPassing, true,                              \
1266          "Use passing of collection from background to foreground")        \
1267                                                                            \
1268  product(bool, UseParNewGC, false,                                         \
1269          "Use parallel threads in the new generation.")                    \
1270                                                                            \
1271  product(bool, ParallelGCVerbose, false,                                   \
1272          "Verbose output for parallel GC.")                                \
1273                                                                            \
1274  product(intx, ParallelGCBufferWastePct, 10,                               \
1275          "wasted fraction of parallel allocation buffer.")                 \
1276                                                                            \
1277  product(bool, ParallelGCRetainPLAB, true,                                 \
1278          "Retain parallel allocation buffers across scavenges.")           \
1279                                                                            \
1280  product(intx, TargetPLABWastePct, 10,                                     \
1281          "target wasted space in last buffer as pct of overall allocation")\
1282                                                                            \
1283  product(uintx, PLABWeight, 75,                                            \
1284          "Percentage (0-100) used to weight the current sample when"       \
1285          "computing exponentially decaying average for ResizePLAB.")       \
1286                                                                            \
1287  product(bool, ResizePLAB, true,                                           \
1288          "Dynamically resize (survivor space) promotion labs")             \
1289                                                                            \
1290  product(bool, PrintPLAB, false,                                           \
1291          "Print (survivor space) promotion labs sizing decisions")         \
1292                                                                            \
1293  product(intx, ParGCArrayScanChunk, 50,                                    \
1294          "Scan a subset and push remainder, if array is bigger than this") \
1295                                                                            \
1296  product(intx, ParGCDesiredObjsFromOverflowList, 20,                       \
1297          "The desired number of objects to claim from the overflow list")  \
1298                                                                            \
1299  product(uintx, CMSParPromoteBlocksToClaim, 50,                            \
1300          "Number of blocks to attempt to claim when refilling CMS LAB for "\
1301          "parallel GC.")                                                   \
1302                                                                            \
1303  product(bool, AlwaysPreTouch, false,                                      \
1304          "It forces all freshly committed pages to be pre-touched.")       \
1305                                                                            \
1306  product(bool, CMSUseOldDefaults, false,                                   \
1307          "A flag temporarily  introduced to allow reverting to some older" \
1308          "default settings; older as of 6.0 ")                             \
1309                                                                            \
1310  product(intx, CMSYoungGenPerWorker, 16*M,                                 \
1311          "The amount of young gen chosen by default per GC worker "        \
1312          "thread available ")                                              \
1313                                                                            \
1314  product(bool, GCOverheadReporting, false,                                 \
1315         "Enables the GC overhead reporting facility")                      \
1316                                                                            \
1317  product(intx, GCOverheadReportingPeriodMS, 100,                           \
1318          "Reporting period for conc GC overhead reporting, in ms ")        \
1319                                                                            \
1320  product(bool, CMSIncrementalMode, false,                                  \
1321          "Whether CMS GC should operate in \"incremental\" mode")          \
1322                                                                            \
1323  product(uintx, CMSIncrementalDutyCycle, 10,                               \
1324          "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1325          "CMSIncrementalPacing is enabled, then this is just the initial"  \
1326          "value")                                                          \
1327                                                                            \
1328  product(bool, CMSIncrementalPacing, true,                                 \
1329          "Whether the CMS incremental mode duty cycle should be "          \
1330          "automatically adjusted")                                         \
1331                                                                            \
1332  product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1333          "Lower bound on the duty cycle when CMSIncrementalPacing is"      \
1334          "enabled (a percentage, 0-100).")                                 \
1335                                                                            \
1336  product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1337          "Percentage (0-100) used to add conservatism when computing the"  \
1338          "duty cycle.")                                                    \
1339                                                                            \
1340  product(uintx, CMSIncrementalOffset, 0,                                   \
1341          "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1342          "is shifted to the right within the period between young GCs")    \
1343                                                                            \
1344  product(uintx, CMSExpAvgFactor, 25,                                       \
1345          "Percentage (0-100) used to weight the current sample when"       \
1346          "computing exponential averages for CMS statistics.")             \
1347                                                                            \
1348  product(uintx, CMS_FLSWeight, 50,                                         \
1349          "Percentage (0-100) used to weight the current sample when"       \
1350          "computing exponentially decating averages for CMS FLS statistics.") \
1351                                                                            \
1352  product(uintx, CMS_FLSPadding, 2,                                         \
1353          "The multiple of deviation from mean to use for buffering"        \
1354          "against volatility in free list demand.")                        \
1355                                                                            \
1356  product(uintx, FLSCoalescePolicy, 2,                                      \
1357          "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1358                                                                            \
1359  product(uintx, CMS_SweepWeight, 50,                                       \
1360          "Percentage (0-100) used to weight the current sample when"       \
1361          "computing exponentially decaying average for inter-sweep duration.") \
1362                                                                            \
1363  product(uintx, CMS_SweepPadding, 2,                                       \
1364          "The multiple of deviation from mean to use for buffering"        \
1365          "against volatility in inter-sweep duration.")                    \
1366                                                                            \
1367  product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1368          "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1369          " duration exceeds this threhold in milliseconds")                \
1370                                                                            \
1371  develop(bool, CMSTraceIncrementalMode, false,                             \
1372          "Trace CMS incremental mode")                                     \
1373                                                                            \
1374  develop(bool, CMSTraceIncrementalPacing, false,                           \
1375          "Trace CMS incremental mode pacing computation")                  \
1376                                                                            \
1377  develop(bool, CMSTraceThreadState, false,                                 \
1378          "Trace the CMS thread state (enable the trace_state() method)")   \
1379                                                                            \
1380  product(bool, CMSClassUnloadingEnabled, false,                            \
1381          "Whether class unloading enabled when using CMS GC")              \
1382                                                                            \
1383  product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1384          "When CMS class unloading is enabled, the maximum CMS cycle count"\
1385          " for which classes may not be unloaded")                         \
1386                                                                            \
1387  product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1388          "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1389                                                                            \
1390  product(bool, UseCMSCompactAtFullCollection, true,                        \
1391          "Use mark sweep compact at full collections")                     \
1392                                                                            \
1393  product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1394          "Number of CMS full collection done before compaction if > 0")    \
1395                                                                            \
1396  develop(intx, CMSDictionaryChoice, 0,                                     \
1397          "Use BinaryTreeDictionary as default in the CMS generation")      \
1398                                                                            \
1399  product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1400          "Replenish and indexed free list with this number of chunks")     \
1401                                                                            \
1402  product(bool, CMSLoopWarn, false,                                         \
1403          "Warn in case of excessive CMS looping")                          \
1404                                                                            \
1405  develop(bool, CMSOverflowEarlyRestoration, false,                         \
1406          "Whether preserved marks should be restored early")               \
1407                                                                            \
1408  product(uintx, CMSMarkStackSize, 32*K,                                    \
1409          "Size of CMS marking stack")                                      \
1410                                                                            \
1411  product(uintx, CMSMarkStackSizeMax, 4*M,                                  \
1412          "Max size of CMS marking stack")                                  \
1413                                                                            \
1414  notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1415          "Whether we should simulate frequent marking stack / work queue"  \
1416          " overflow")                                                      \
1417                                                                            \
1418  notproduct(intx, CMSMarkStackOverflowInterval, 1000,                      \
1419          "A per-thread `interval' counter that determines how frequently"  \
1420          " we simulate overflow; a smaller number increases frequency")    \
1421                                                                            \
1422  product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1423          "(Temporary, subject to experimentation)"                         \
1424          "Maximum number of abortable preclean iterations, if > 0")        \
1425                                                                            \
1426  product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1427          "(Temporary, subject to experimentation)"                         \
1428          "Maximum time in abortable preclean in ms")                       \
1429                                                                            \
1430  product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1431          "(Temporary, subject to experimentation)"                         \
1432          "Nominal minimum work per abortable preclean iteration")          \
1433                                                                            \
1434  product(intx, CMSAbortablePrecleanWaitMillis, 100,                        \
1435          "(Temporary, subject to experimentation)"                         \
1436          " Time that we sleep between iterations when not given"           \
1437          " enough work per iteration")                                     \
1438                                                                            \
1439  product(uintx, CMSRescanMultiple, 32,                                     \
1440          "Size (in cards) of CMS parallel rescan task")                    \
1441                                                                            \
1442  product(uintx, CMSConcMarkMultiple, 32,                                   \
1443          "Size (in cards) of CMS concurrent MT marking task")              \
1444                                                                            \
1445  product(uintx, CMSRevisitStackSize, 1*M,                                  \
1446          "Size of CMS KlassKlass revisit stack")                           \
1447                                                                            \
1448  product(bool, CMSAbortSemantics, false,                                   \
1449          "Whether abort-on-overflow semantics is implemented")             \
1450                                                                            \
1451  product(bool, CMSParallelRemarkEnabled, true,                             \
1452          "Whether parallel remark enabled (only if ParNewGC)")             \
1453                                                                            \
1454  product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1455          "Whether parallel remark of survivor space"                       \
1456          " enabled (effective only if CMSParallelRemarkEnabled)")          \
1457                                                                            \
1458  product(bool, CMSPLABRecordAlways, true,                                  \
1459          "Whether to always record survivor space PLAB bdries"             \
1460          " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1461                                                                            \
1462  product(bool, CMSConcurrentMTEnabled, true,                               \
1463          "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1464                                                                            \
1465  product(bool, CMSPermGenPrecleaningEnabled, true,                         \
1466          "Whether concurrent precleaning enabled in perm gen"              \
1467          " (effective only when CMSPrecleaningEnabled is true)")           \
1468                                                                            \
1469  product(bool, CMSPrecleaningEnabled, true,                                \
1470          "Whether concurrent precleaning enabled")                         \
1471                                                                            \
1472  product(uintx, CMSPrecleanIter, 3,                                        \
1473          "Maximum number of precleaning iteration passes")                 \
1474                                                                            \
1475  product(uintx, CMSPrecleanNumerator, 2,                                   \
1476          "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1477          " ratio")                                                         \
1478                                                                            \
1479  product(uintx, CMSPrecleanDenominator, 3,                                 \
1480          "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1481          " ratio")                                                         \
1482                                                                            \
1483  product(bool, CMSPrecleanRefLists1, true,                                 \
1484          "Preclean ref lists during (initial) preclean phase")             \
1485                                                                            \
1486  product(bool, CMSPrecleanRefLists2, false,                                \
1487          "Preclean ref lists during abortable preclean phase")             \
1488                                                                            \
1489  product(bool, CMSPrecleanSurvivors1, false,                               \
1490          "Preclean survivors during (initial) preclean phase")             \
1491                                                                            \
1492  product(bool, CMSPrecleanSurvivors2, true,                                \
1493          "Preclean survivors during abortable preclean phase")             \
1494                                                                            \
1495  product(uintx, CMSPrecleanThreshold, 1000,                                \
1496          "Don't re-iterate if #dirty cards less than this")                \
1497                                                                            \
1498  product(bool, CMSCleanOnEnter, true,                                      \
1499          "Clean-on-enter optimization for reducing number of dirty cards") \
1500                                                                            \
1501  product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1502          "Choose variant (1,2) of verification following remark")          \
1503                                                                            \
1504  product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1505          "If Eden used is below this value, don't try to schedule remark") \
1506                                                                            \
1507  product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1508          "The Eden occupancy % at which to try and schedule remark pause") \
1509                                                                            \
1510  product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1511          "Start sampling Eden top at least before yg occupancy reaches"    \
1512          " 1/<ratio> of the size at which we plan to schedule remark")     \
1513                                                                            \
1514  product(uintx, CMSSamplingGrain, 16*K,                                    \
1515          "The minimum distance between eden samples for CMS (see above)")  \
1516                                                                            \
1517  product(bool, CMSScavengeBeforeRemark, false,                             \
1518          "Attempt scavenge before the CMS remark step")                    \
1519                                                                            \
1520  develop(bool, CMSTraceSweeper, false,                                     \
1521          "Trace some actions of the CMS sweeper")                          \
1522                                                                            \
1523  product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1524          "Don't drain below this size per parallel worker/thief")          \
1525                                                                            \
1526  product(intx, CMSWaitDuration, 2000,                                      \
1527          "Time in milliseconds that CMS thread waits for young GC")        \
1528                                                                            \
1529  product(bool, CMSYield, true,                                             \
1530          "Yield between steps of concurrent mark & sweep")                 \
1531                                                                            \
1532  product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1533          "Bitmap operations should process at most this many bits"         \
1534          "between yields")                                                 \
1535                                                                            \
1536  diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1537          "Verify that all refs across the FLS boundary "                   \
1538          " are to valid objects")                                          \
1539                                                                            \
1540  diagnostic(bool, FLSVerifyLists, false,                                   \
1541          "Do lots of (expensive) FreeListSpace verification")              \
1542                                                                            \
1543  diagnostic(bool, FLSVerifyIndexTable, false,                              \
1544          "Do lots of (expensive) FLS index table verification")            \
1545                                                                            \
1546  develop(bool, FLSVerifyDictionary, false,                                 \
1547          "Do lots of (expensive) FLS dictionary verification")             \
1548                                                                            \
1549  develop(bool, VerifyBlockOffsetArray, false,                              \
1550          "Do (expensive!) block offset array verification")                \
1551                                                                            \
1552  product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug,           \
1553          "Maintain _unallocated_block in BlockOffsetArray"                 \
1554          " (currently applicable only to CMS collector)")                  \
1555                                                                            \
1556  develop(bool, TraceCMSState, false,                                       \
1557          "Trace the state of the CMS collection")                          \
1558                                                                            \
1559  product(intx, RefDiscoveryPolicy, 0,                                      \
1560          "Whether reference-based(0) or referent-based(1)")                \
1561                                                                            \
1562  product(bool, ParallelRefProcEnabled, false,                              \
1563          "Enable parallel reference processing whenever possible")         \
1564                                                                            \
1565  product(bool, ParallelRefProcBalancingEnabled, true,                      \
1566          "Enable balancing of reference processing queues")                \
1567                                                                            \
1568  product(intx, CMSTriggerRatio, 80,                                        \
1569          "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1570          "  allocated before a CMS collection cycle commences")            \
1571                                                                            \
1572  product(intx, CMSTriggerPermRatio, 80,                                    \
1573          "Percentage of MinHeapFreeRatio in the CMS perm generation that"  \
1574          "  is allocated before a CMS collection cycle commences, that  "  \
1575          "  also collects the perm generation")                            \
1576                                                                            \
1577  product(uintx, CMSBootstrapOccupancy, 50,                                 \
1578          "Percentage CMS generation occupancy at which to "                \
1579          " initiate CMS collection for bootstrapping collection stats")    \
1580                                                                            \
1581  product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1582          "Percentage CMS generation occupancy to start a CMS collection "  \
1583          " cycle (A negative value means that CMSTriggerRatio is used)")   \
1584                                                                            \
1585  product(intx, CMSInitiatingPermOccupancyFraction, -1,                     \
1586          "Percentage CMS perm generation occupancy to start a CMScollection"\
1587          " cycle (A negative value means that CMSTriggerPermRatio is used)")\
1588                                                                            \
1589  product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1590          "Only use occupancy as a crierion for starting a CMS collection") \
1591                                                                            \
1592  product(intx, CMSIsTooFullPercentage, 98,                                 \
1593          "An absolute ceiling above which CMS will always consider the"    \
1594          " perm gen ripe for collection")                                  \
1595                                                                            \
1596  develop(bool, CMSTestInFreeList, false,                                   \
1597          "Check if the coalesced range is already in the "                 \
1598          "free lists as claimed.")                                         \
1599                                                                            \
1600  notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1601          "Check that all the garbage collected was returned to the "       \
1602          "free lists.")                                                    \
1603                                                                            \
1604  notproduct(bool, ScavengeALot, false,                                     \
1605          "Force scavenge at every Nth exit from the runtime system "       \
1606          "(N=ScavengeALotInterval)")                                       \
1607                                                                            \
1608  develop(bool, FullGCALot, false,                                          \
1609          "Force full gc at every Nth exit from the runtime system "        \
1610          "(N=FullGCALotInterval)")                                         \
1611                                                                            \
1612  notproduct(bool, GCALotAtAllSafepoints, false,                            \
1613          "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1614                                                                            \
1615  product(bool, HandlePromotionFailure, true,                               \
1616          "The youngest generation collection does not require"             \
1617          " a guarantee of full promotion of all live objects.")            \
1618                                                                            \
1619  notproduct(bool, PromotionFailureALot, false,                             \
1620          "Use promotion failure handling on every youngest generation "    \
1621          "collection")                                                     \
1622                                                                            \
1623  develop(uintx, PromotionFailureALotCount, 1000,                           \
1624          "Number of promotion failures occurring at ParGCAllocBuffer"      \
1625          "refill attempts (ParNew) or promotion attempts "                 \
1626          "(other young collectors) ")                                      \
1627                                                                            \
1628  develop(uintx, PromotionFailureALotInterval, 5,                           \
1629          "Total collections between promotion failures alot")              \
1630                                                                            \
1631  develop(intx, WorkStealingSleepMillis, 1,                                 \
1632          "Sleep time when sleep is used for yields")                       \
1633                                                                            \
1634  develop(uintx, WorkStealingYieldsBeforeSleep, 1000,                       \
1635          "Number of yields before a sleep is done during workstealing")    \
1636                                                                            \
1637  product(uintx, PreserveMarkStackSize, 40,                                 \
1638           "Size for stack used in promotion failure handling")             \
1639                                                                            \
1640  product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1641                                                                            \
1642  product_pd(bool, ResizeTLAB,                                              \
1643          "Dynamically resize tlab size for threads")                       \
1644                                                                            \
1645  product(bool, ZeroTLAB, false,                                            \
1646          "Zero out the newly created TLAB")                                \
1647                                                                            \
1648  product(bool, FastTLABRefill, true,                                       \
1649          "Use fast TLAB refill code")                                      \
1650                                                                            \
1651  product(bool, PrintTLAB, false,                                           \
1652          "Print various TLAB related information")                         \
1653                                                                            \
1654  product(bool, TLABStats, true,                                            \
1655          "Print various TLAB related information")                         \
1656                                                                            \
1657  product_pd(bool, NeverActAsServerClassMachine,                            \
1658          "Never act like a server-class machine")                          \
1659                                                                            \
1660  product(bool, AlwaysActAsServerClassMachine, false,                       \
1661          "Always act like a server-class machine")                         \
1662                                                                            \
1663  product_pd(uintx, DefaultMaxRAM,                                          \
1664          "Maximum real memory size for setting server class heap size")    \
1665                                                                            \
1666  product(uintx, DefaultMaxRAMFraction, 4,                                  \
1667          "Fraction (1/n) of real memory used for server class max heap")   \
1668                                                                            \
1669  product(uintx, DefaultInitialRAMFraction, 64,                             \
1670          "Fraction (1/n) of real memory used for server class initial heap")  \
1671                                                                            \
1672  product(bool, UseAutoGCSelectPolicy, false,                               \
1673          "Use automatic collection selection policy")                      \
1674                                                                            \
1675  product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1676          "Automatic GC selection pause threshhold in ms")                  \
1677                                                                            \
1678  product(bool, UseAdaptiveSizePolicy, true,                                \
1679          "Use adaptive generation sizing policies")                        \
1680                                                                            \
1681  product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
1682          "Use adaptive survivor sizing policies")                          \
1683                                                                            \
1684  product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
1685          "Use adaptive young-old sizing policies at minor collections")    \
1686                                                                            \
1687  product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
1688          "Use adaptive young-old sizing policies at major collections")    \
1689                                                                            \
1690  product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
1691          "Use statistics from System.GC for adaptive size policy")         \
1692                                                                            \
1693  product(bool, UseAdaptiveGCBoundary, false,                               \
1694          "Allow young-old boundary to move")                               \
1695                                                                            \
1696  develop(bool, TraceAdaptiveGCBoundary, false,                             \
1697          "Trace young-old boundary moves")                                 \
1698                                                                            \
1699  develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
1700          "Resize the virtual spaces of the young or old generations")      \
1701                                                                            \
1702  product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
1703          "Policy for changeing generation size for throughput goals")      \
1704                                                                            \
1705  product(uintx, AdaptiveSizePausePolicy, 0,                                \
1706          "Policy for changing generation size for pause goals")            \
1707                                                                            \
1708  develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
1709          "Adjust tenured generation to achive a minor pause goal")         \
1710                                                                            \
1711  develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
1712          "Adjust young generation to achive a major pause goal")           \
1713                                                                            \
1714  product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
1715          "Number of steps where heuristics is used before data is used")   \
1716                                                                            \
1717  develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
1718          "Number of collections before the adaptive sizing is started")    \
1719                                                                            \
1720  product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
1721          "Collecton interval for printing information, zero => never")     \
1722                                                                            \
1723  product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
1724          "Use adaptive minimum footprint as a goal")                       \
1725                                                                            \
1726  product(uintx, AdaptiveSizePolicyWeight, 10,                              \
1727          "Weight given to exponential resizing, between 0 and 100")        \
1728                                                                            \
1729  product(uintx, AdaptiveTimeWeight,       25,                              \
1730          "Weight given to time in adaptive policy, between 0 and 100")     \
1731                                                                            \
1732  product(uintx, PausePadding, 1,                                           \
1733          "How much buffer to keep for pause time")                         \
1734                                                                            \
1735  product(uintx, PromotedPadding, 3,                                        \
1736          "How much buffer to keep for promotion failure")                  \
1737                                                                            \
1738  product(uintx, SurvivorPadding, 3,                                        \
1739          "How much buffer to keep for survivor overflow")                  \
1740                                                                            \
1741  product(uintx, AdaptivePermSizeWeight, 20,                                \
1742          "Weight for perm gen exponential resizing, between 0 and 100")    \
1743                                                                            \
1744  product(uintx, PermGenPadding, 3,                                         \
1745          "How much buffer to keep for perm gen sizing")                    \
1746                                                                            \
1747  product(uintx, ThresholdTolerance, 10,                                    \
1748          "Allowed collection cost difference between generations")         \
1749                                                                            \
1750  product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
1751          "If collection costs are within margin, reduce both by full delta") \
1752                                                                            \
1753  product(uintx, YoungGenerationSizeIncrement, 20,                          \
1754          "Adaptive size percentage change in young generation")            \
1755                                                                            \
1756  product(uintx, YoungGenerationSizeSupplement, 80,                         \
1757          "Supplement to YoungedGenerationSizeIncrement used at startup")   \
1758                                                                            \
1759  product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
1760          "Decay factor to YoungedGenerationSizeSupplement")                \
1761                                                                            \
1762  product(uintx, TenuredGenerationSizeIncrement, 20,                        \
1763          "Adaptive size percentage change in tenured generation")          \
1764                                                                            \
1765  product(uintx, TenuredGenerationSizeSupplement, 80,                       \
1766          "Supplement to TenuredGenerationSizeIncrement used at startup")   \
1767                                                                            \
1768  product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
1769          "Decay factor to TenuredGenerationSizeIncrement")                 \
1770                                                                            \
1771  product(uintx, MaxGCPauseMillis, max_uintx,                               \
1772          "Adaptive size policy maximum GC pause time goal in msec")        \
1773                                                                            \
1774  product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
1775          "Adaptive size policy maximum GC minor pause time goal in msec")  \
1776                                                                            \
1777  product(uintx, GCTimeRatio, 99,                                           \
1778          "Adaptive size policy application time to GC time ratio")         \
1779                                                                            \
1780  product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
1781          "Adaptive size scale down factor for shrinking")                  \
1782                                                                            \
1783  product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
1784          "Adaptive size decays the major cost for long major intervals")   \
1785                                                                            \
1786  product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
1787          "Time scale over which major costs decay")                        \
1788                                                                            \
1789  product(uintx, MinSurvivorRatio, 3,                                       \
1790          "Minimum ratio of young generation/survivor space size")          \
1791                                                                            \
1792  product(uintx, InitialSurvivorRatio, 8,                                   \
1793          "Initial ratio of eden/survivor space size")                      \
1794                                                                            \
1795  product(uintx, BaseFootPrintEstimate, 256*M,                              \
1796          "Estimate of footprint other than Java Heap")                     \
1797                                                                            \
1798  product(bool, UseGCOverheadLimit, true,                                   \
1799          "Use policy to limit of proportion of time spent in GC "          \
1800          "before an OutOfMemory error is thrown")                          \
1801                                                                            \
1802  product(uintx, GCTimeLimit, 98,                                           \
1803          "Limit of proportion of time spent in GC before an OutOfMemory"   \
1804          "error is thrown (used with GCHeapFreeLimit)")                    \
1805                                                                            \
1806  product(uintx, GCHeapFreeLimit, 2,                                        \
1807          "Minimum percentage of free space after a full GC before an "     \
1808          "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
1809                                                                            \
1810  develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
1811          "Number of consecutive collections before gc time limit fires")   \
1812                                                                            \
1813  product(bool, PrintAdaptiveSizePolicy, false,                             \
1814          "Print information about AdaptiveSizePolicy")                     \
1815                                                                            \
1816  product(intx, PrefetchCopyIntervalInBytes, -1,                            \
1817          "How far ahead to prefetch destination area (<= 0 means off)")    \
1818                                                                            \
1819  product(intx, PrefetchScanIntervalInBytes, -1,                            \
1820          "How far ahead to prefetch scan area (<= 0 means off)")           \
1821                                                                            \
1822  product(intx, PrefetchFieldsAhead, -1,                                    \
1823          "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
1824                                                                            \
1825  develop(bool, UsePrefetchQueue, true,                                     \
1826          "Use the prefetch queue during PS promotion")                     \
1827                                                                            \
1828  diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
1829          "Verify system before exiting")                                   \
1830                                                                            \
1831  diagnostic(bool, VerifyBeforeGC, false,                                   \
1832          "Verify memory system before GC")                                 \
1833                                                                            \
1834  diagnostic(bool, VerifyAfterGC, false,                                    \
1835          "Verify memory system after GC")                                  \
1836                                                                            \
1837  diagnostic(bool, VerifyDuringGC, false,                                   \
1838          "Verify memory system during GC (between phases)")                \
1839                                                                            \
1840  diagnostic(bool, GCParallelVerificationEnabled, true,                     \
1841          "Enable parallel memory system verification")                     \
1842                                                                            \
1843  diagnostic(bool, VerifyRememberedSets, false,                             \
1844          "Verify GC remembered sets")                                      \
1845                                                                            \
1846  diagnostic(bool, VerifyObjectStartArray, true,                            \
1847          "Verify GC object start array if verify before/after")            \
1848                                                                            \
1849  product(bool, DisableExplicitGC, false,                                   \
1850          "Tells whether calling System.gc() does a full GC")               \
1851                                                                            \
1852  notproduct(bool, CheckMemoryInitialization, false,                        \
1853          "Checks memory initialization")                                   \
1854                                                                            \
1855  product(bool, CollectGen0First, false,                                    \
1856          "Collect youngest generation before each full GC")                \
1857                                                                            \
1858  diagnostic(bool, BindCMSThreadToCPU, false,                               \
1859          "Bind CMS Thread to CPU if possible")                             \
1860                                                                            \
1861  diagnostic(uintx, CPUForCMSThread, 0,                                     \
1862          "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
1863                                                                            \
1864  product(bool, BindGCTaskThreadsToCPUs, false,                             \
1865          "Bind GCTaskThreads to CPUs if possible")                         \
1866                                                                            \
1867  product(bool, UseGCTaskAffinity, false,                                   \
1868          "Use worker affinity when asking for GCTasks")                    \
1869                                                                            \
1870  product(uintx, ProcessDistributionStride, 4,                              \
1871          "Stride through processors when distributing processes")          \
1872                                                                            \
1873  product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
1874          "number of times the coordinator GC thread will sleep while "     \
1875          "yielding before giving up and resuming GC")                      \
1876                                                                            \
1877  product(uintx, CMSYieldSleepCount, 0,                                     \
1878          "number of times a GC thread (minus the coordinator) "            \
1879          "will sleep while yielding before giving up and resuming GC")     \
1880                                                                            \
1881  notproduct(bool, PrintFlagsFinal, false,                                  \
1882          "Print all command line flags after argument processing")         \
1883                                                                            \
1884  /* gc tracing */                                                          \
1885  manageable(bool, PrintGC, false,                                          \
1886          "Print message at garbage collect")                               \
1887                                                                            \
1888  manageable(bool, PrintGCDetails, false,                                   \
1889          "Print more details at garbage collect")                          \
1890                                                                            \
1891  manageable(bool, PrintGCDateStamps, false,                                \
1892          "Print date stamps at garbage collect")                           \
1893                                                                            \
1894  manageable(bool, PrintGCTimeStamps, false,                                \
1895          "Print timestamps at garbage collect")                            \
1896                                                                            \
1897  product(bool, PrintGCTaskTimeStamps, false,                               \
1898          "Print timestamps for individual gc worker thread tasks")         \
1899                                                                            \
1900  develop(intx, ConcGCYieldTimeout, 0,                                      \
1901          "If non-zero, assert that GC threads yield within this # of ms.") \
1902                                                                            \
1903  notproduct(bool, TraceMarkSweep, false,                                   \
1904          "Trace mark sweep")                                               \
1905                                                                            \
1906  product(bool, PrintReferenceGC, false,                                    \
1907          "Print times spent handling reference objects during GC "         \
1908          " (enabled only when PrintGCDetails)")                            \
1909                                                                            \
1910  develop(bool, TraceReferenceGC, false,                                    \
1911          "Trace handling of soft/weak/final/phantom references")           \
1912                                                                            \
1913  develop(bool, TraceFinalizerRegistration, false,                          \
1914         "Trace registration of final references")                          \
1915                                                                            \
1916  notproduct(bool, TraceScavenge, false,                                    \
1917          "Trace scavenge")                                                 \
1918                                                                            \
1919  product_rw(bool, TraceClassLoading, false,                                \
1920          "Trace all classes loaded")                                       \
1921                                                                            \
1922  product(bool, TraceClassLoadingPreorder, false,                           \
1923          "Trace all classes loaded in order referenced (not loaded)")      \
1924                                                                            \
1925  product_rw(bool, TraceClassUnloading, false,                              \
1926          "Trace unloading of classes")                                     \
1927                                                                            \
1928  product_rw(bool, TraceLoaderConstraints, false,                           \
1929          "Trace loader constraints")                                       \
1930                                                                            \
1931  product(bool, TraceGen0Time, false,                                       \
1932          "Trace accumulated time for Gen 0 collection")                    \
1933                                                                            \
1934  product(bool, TraceGen1Time, false,                                       \
1935          "Trace accumulated time for Gen 1 collection")                    \
1936                                                                            \
1937  product(bool, PrintTenuringDistribution, false,                           \
1938          "Print tenuring age information")                                 \
1939                                                                            \
1940  product_rw(bool, PrintHeapAtGC, false,                                    \
1941          "Print heap layout before and after each GC")                     \
1942                                                                            \
1943  product(bool, PrintHeapAtSIGBREAK, true,                                  \
1944          "Print heap layout in response to SIGBREAK")                      \
1945                                                                            \
1946  manageable(bool, PrintClassHistogram, false,                              \
1947          "Print a histogram of class instances")                           \
1948                                                                            \
1949  develop(bool, TraceWorkGang, false,                                       \
1950          "Trace activities of work gangs")                                 \
1951                                                                            \
1952  product(bool, TraceParallelOldGCTasks, false,                             \
1953          "Trace multithreaded GC activity")                                \
1954                                                                            \
1955  develop(bool, TraceBlockOffsetTable, false,                               \
1956          "Print BlockOffsetTable maps")                                    \
1957                                                                            \
1958  develop(bool, TraceCardTableModRefBS, false,                              \
1959          "Print CardTableModRefBS maps")                                   \
1960                                                                            \
1961  develop(bool, TraceGCTaskManager, false,                                  \
1962          "Trace actions of the GC task manager")                           \
1963                                                                            \
1964  develop(bool, TraceGCTaskQueue, false,                                    \
1965          "Trace actions of the GC task queues")                            \
1966                                                                            \
1967  develop(bool, TraceGCTaskThread, false,                                   \
1968          "Trace actions of the GC task threads")                           \
1969                                                                            \
1970  product(bool, PrintParallelOldGCPhaseTimes, false,                        \
1971          "Print the time taken by each parallel old gc phase."             \
1972          "PrintGCDetails must also be enabled.")                           \
1973                                                                            \
1974  develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
1975          "Trace parallel old gc marking phase")                            \
1976                                                                            \
1977  develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
1978          "Trace parallel old gc summary phase")                            \
1979                                                                            \
1980  develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
1981          "Trace parallel old gc compaction phase")                         \
1982                                                                            \
1983  develop(bool, TraceParallelOldGCDensePrefix, false,                       \
1984          "Trace parallel old gc dense prefix computation")                 \
1985                                                                            \
1986  develop(bool, IgnoreLibthreadGPFault, false,                              \
1987          "Suppress workaround for libthread GP fault")                     \
1988                                                                            \
1989  product(bool, PrintJNIGCStalls, false,                                    \
1990          "Print diagnostic message when GC is stalled"                     \
1991          "by JNI critical section")                                        \
1992                                                                            \
1993  /* JVMTI heap profiling */                                                \
1994                                                                            \
1995  diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
1996          "Trace JVMTI object tagging calls")                               \
1997                                                                            \
1998  diagnostic(bool, VerifyBeforeIteration, false,                            \
1999          "Verify memory system before JVMTI iteration")                    \
2000                                                                            \
2001  /* compiler interface */                                                  \
2002                                                                            \
2003  develop(bool, CIPrintCompilerName, false,                                 \
2004          "when CIPrint is active, print the name of the active compiler")  \
2005                                                                            \
2006  develop(bool, CIPrintCompileQueue, false,                                 \
2007          "display the contents of the compile queue whenever a "           \
2008          "compilation is enqueued")                                        \
2009                                                                            \
2010  develop(bool, CIPrintRequests, false,                                     \
2011          "display every request for compilation")                          \
2012                                                                            \
2013  product(bool, CITime, false,                                              \
2014          "collect timing information for compilation")                     \
2015                                                                            \
2016  develop(bool, CITimeEach, false,                                          \
2017          "display timing information after each successful compilation")   \
2018                                                                            \
2019  develop(bool, CICountOSR, true,                                           \
2020          "use a separate counter when assigning ids to osr compilations")  \
2021                                                                            \
2022  develop(bool, CICompileNatives, true,                                     \
2023          "compile native methods if supported by the compiler")            \
2024                                                                            \
2025  develop_pd(bool, CICompileOSR,                                            \
2026          "compile on stack replacement methods if supported by the "       \
2027          "compiler")                                                       \
2028                                                                            \
2029  develop(bool, CIPrintMethodCodes, false,                                  \
2030          "print method bytecodes of the compiled code")                    \
2031                                                                            \
2032  develop(bool, CIPrintTypeFlow, false,                                     \
2033          "print the results of ciTypeFlow analysis")                       \
2034                                                                            \
2035  develop(bool, CITraceTypeFlow, false,                                     \
2036          "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2037                                                                            \
2038  develop(intx, CICloneLoopTestLimit, 100,                                  \
2039          "size limit for blocks heuristically cloned in ciTypeFlow")       \
2040                                                                            \
2041  /* temp diagnostics */                                                    \
2042                                                                            \
2043  diagnostic(bool, TraceRedundantCompiles, false,                           \
2044          "Have compile broker print when a request already in the queue is"\
2045          " requested again")                                               \
2046                                                                            \
2047  diagnostic(bool, InitialCompileFast, false,                               \
2048          "Initial compile at CompLevel_fast_compile")                      \
2049                                                                            \
2050  diagnostic(bool, InitialCompileReallyFast, false,                         \
2051          "Initial compile at CompLevel_really_fast_compile (no profile)")  \
2052                                                                            \
2053  diagnostic(bool, FullProfileOnReInterpret, true,                          \
2054          "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2055                                                                            \
2056  /* compiler */                                                            \
2057                                                                            \
2058  product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2059          "Number of compiler threads to run")                              \
2060                                                                            \
2061  product(intx, CompilationPolicyChoice, 0,                                 \
2062          "which compilation policy (0/1)")                                 \
2063                                                                            \
2064  develop(bool, UseStackBanging, true,                                      \
2065          "use stack banging for stack overflow checks (required for "      \
2066          "proper StackOverflow handling; disable only to measure cost "    \
2067          "of stackbanging)")                                               \
2068                                                                            \
2069  develop(bool, Use24BitFPMode, true,                                       \
2070          "Set 24-bit FPU mode on a per-compile basis ")                    \
2071                                                                            \
2072  develop(bool, Use24BitFP, true,                                           \
2073          "use FP instructions that produce 24-bit precise results")        \
2074                                                                            \
2075  develop(bool, UseStrictFP, true,                                          \
2076          "use strict fp if modifier strictfp is set")                      \
2077                                                                            \
2078  develop(bool, GenerateSynchronizationCode, true,                          \
2079          "generate locking/unlocking code for synchronized methods and "   \
2080          "monitors")                                                       \
2081                                                                            \
2082  develop(bool, GenerateCompilerNullChecks, true,                           \
2083          "Generate explicit null checks for loads/stores/calls")           \
2084                                                                            \
2085  develop(bool, GenerateRangeChecks, true,                                  \
2086          "Generate range checks for array accesses")                       \
2087                                                                            \
2088  develop_pd(bool, ImplicitNullChecks,                                      \
2089          "generate code for implicit null checks")                         \
2090                                                                            \
2091  product(bool, PrintSafepointStatistics, false,                            \
2092          "print statistics about safepoint synchronization")               \
2093                                                                            \
2094  product(intx, PrintSafepointStatisticsCount, 300,                         \
2095          "total number of safepoint statistics collected "                 \
2096          "before printing them out")                                       \
2097                                                                            \
2098  product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2099          "print safepoint statistics only when safepoint takes"            \
2100          " more than PrintSafepointSatisticsTimeout in millis")            \
2101                                                                            \
2102  develop(bool, InlineAccessors, true,                                      \
2103          "inline accessor methods (get/set)")                              \
2104                                                                            \
2105  product(bool, Inline, true,                                               \
2106          "enable inlining")                                                \
2107                                                                            \
2108  product(bool, ClipInlining, true,                                         \
2109          "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2110                                                                            \
2111  develop(bool, UseCHA, true,                                               \
2112          "enable CHA")                                                     \
2113                                                                            \
2114  product(bool, UseTypeProfile, true,                                       \
2115          "Check interpreter profile for historically monomorphic calls")   \
2116                                                                            \
2117  product(intx, TypeProfileMajorReceiverPercent, 90,                        \
2118          "% of major receiver type to all profiled receivers")             \
2119                                                                            \
2120  notproduct(bool, TimeCompiler, false,                                     \
2121          "time the compiler")                                              \
2122                                                                            \
2123  notproduct(bool, TimeCompiler2, false,                                    \
2124          "detailed time the compiler (requires +TimeCompiler)")            \
2125                                                                            \
2126  diagnostic(bool, PrintInlining, false,                                    \
2127          "prints inlining optimizations")                                  \
2128                                                                            \
2129  diagnostic(bool, PrintIntrinsics, false,                                  \
2130          "prints attempted and successful inlining of intrinsics")         \
2131                                                                            \
2132  diagnostic(ccstrlist, DisableIntrinsic, "",                               \
2133          "do not expand intrinsics whose (internal) names appear here")    \
2134                                                                            \
2135  develop(bool, StressReflectiveCode, false,                                \
2136          "Use inexact types at allocations, etc., to test reflection")     \
2137                                                                            \
2138  develop(bool, EagerInitialization, false,                                 \
2139          "Eagerly initialize classes if possible")                         \
2140                                                                            \
2141  product(bool, Tier1UpdateMethodData, trueInTiered,                        \
2142          "Update methodDataOops in Tier1-generated code")                  \
2143                                                                            \
2144  develop(bool, TraceMethodReplacement, false,                              \
2145          "Print when methods are replaced do to recompilation")            \
2146                                                                            \
2147  develop(bool, PrintMethodFlushing, false,                                 \
2148          "print the nmethods being flushed")                               \
2149                                                                            \
2150  notproduct(bool, LogMultipleMutexLocking, false,                          \
2151          "log locking and unlocking of mutexes (only if multiple locks "   \
2152          "are held)")                                                      \
2153                                                                            \
2154  develop(bool, UseRelocIndex, false,                                       \
2155         "use an index to speed random access to relocations")              \
2156                                                                            \
2157  develop(bool, StressCodeBuffers, false,                                   \
2158         "Exercise code buffer expansion and other rare state changes")     \
2159                                                                            \
2160  diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2161         "Generate extra debugging info for non-safepoints in nmethods")    \
2162                                                                            \
2163  diagnostic(bool, DebugInlinedCalls, true,                                 \
2164         "If false, restricts profiled locations to the root method only")  \
2165                                                                            \
2166  product(bool, PrintVMOptions, trueInDebug,                                \
2167         "print VM flag settings")                                          \
2168                                                                            \
2169  diagnostic(bool, SerializeVMOutput, true,                                 \
2170         "Use a mutex to serialize output to tty and hotspot.log")          \
2171                                                                            \
2172  diagnostic(bool, DisplayVMOutput, true,                                   \
2173         "Display all VM output on the tty, independently of LogVMOutput")  \
2174                                                                            \
2175  diagnostic(bool, LogVMOutput, trueInDebug,                                \
2176         "Save VM output to hotspot.log, or to LogFile")                    \
2177                                                                            \
2178  diagnostic(ccstr, LogFile, NULL,                                          \
2179         "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2180                                                                            \
2181  product(ccstr, ErrorFile, NULL,                                           \
2182         "If an error occurs, save the error data to this file "            \
2183         "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2184                                                                            \
2185  product(bool, DisplayVMOutputToStderr, false,                             \
2186         "If DisplayVMOutput is true, display all VM output to stderr")     \
2187                                                                            \
2188  product(bool, DisplayVMOutputToStdout, false,                             \
2189         "If DisplayVMOutput is true, display all VM output to stdout")     \
2190                                                                            \
2191  product(bool, UseHeavyMonitors, false,                                    \
2192          "use heavyweight instead of lightweight Java monitors")           \
2193                                                                            \
2194  notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2195          "print histogram of the symbol table")                            \
2196                                                                            \
2197  notproduct(bool, ExitVMOnVerifyError, false,                              \
2198          "standard exit from VM if bytecode verify error "                 \
2199          "(only in debug mode)")                                           \
2200                                                                            \
2201  notproduct(ccstr, AbortVMOnException, NULL,                               \
2202          "Call fatal if this exception is thrown.  Example: "              \
2203          "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2204                                                                            \
2205  develop(bool, DebugVtables, false,                                        \
2206          "add debugging code to vtable dispatch")                          \
2207                                                                            \
2208  develop(bool, PrintVtables, false,                                        \
2209          "print vtables when printing klass")                              \
2210                                                                            \
2211  notproduct(bool, PrintVtableStats, false,                                 \
2212          "print vtables stats at end of run")                              \
2213                                                                            \
2214  develop(bool, TraceCreateZombies, false,                                  \
2215          "trace creation of zombie nmethods")                              \
2216                                                                            \
2217  notproduct(bool, IgnoreLockingAssertions, false,                          \
2218          "disable locking assertions (for speed)")                         \
2219                                                                            \
2220  notproduct(bool, VerifyLoopOptimizations, false,                          \
2221          "verify major loop optimizations")                                \
2222                                                                            \
2223  product(bool, RangeCheckElimination, true,                                \
2224          "Split loop iterations to eliminate range checks")                \
2225                                                                            \
2226  develop_pd(bool, UncommonNullCast,                                        \
2227          "track occurrences of null in casts; adjust compiler tactics")    \
2228                                                                            \
2229  develop(bool, TypeProfileCasts,  true,                                    \
2230          "treat casts like calls for purposes of type profiling")          \
2231                                                                            \
2232  develop(bool, MonomorphicArrayCheck, true,                                \
2233          "Uncommon-trap array store checks that require full type check")  \
2234                                                                            \
2235  develop(bool, DelayCompilationDuringStartup, true,                        \
2236          "Delay invoking the compiler until main application class is "    \
2237          "loaded")                                                         \
2238                                                                            \
2239  develop(bool, CompileTheWorld, false,                                     \
2240          "Compile all methods in all classes in bootstrap class path "     \
2241          "(stress test)")                                                  \
2242                                                                            \
2243  develop(bool, CompileTheWorldPreloadClasses, true,                        \
2244          "Preload all classes used by a class before start loading")       \
2245                                                                            \
2246  notproduct(bool, CompileTheWorldIgnoreInitErrors, false,                  \
2247          "Compile all methods although class initializer failed")          \
2248                                                                            \
2249  develop(bool, TraceIterativeGVN, false,                                   \
2250          "Print progress during Iterative Global Value Numbering")         \
2251                                                                            \
2252  develop(bool, FillDelaySlots, true,                                       \
2253          "Fill delay slots (on SPARC only)")                               \
2254                                                                            \
2255  develop(bool, VerifyIterativeGVN, false,                                  \
2256          "Verify Def-Use modifications during sparse Iterative Global "    \
2257          "Value Numbering")                                                \
2258                                                                            \
2259  notproduct(bool, TracePhaseCCP, false,                                    \
2260          "Print progress during Conditional Constant Propagation")         \
2261                                                                            \
2262  develop(bool, TimeLivenessAnalysis, false,                                \
2263          "Time computation of bytecode liveness analysis")                 \
2264                                                                            \
2265  develop(bool, TraceLivenessGen, false,                                    \
2266          "Trace the generation of liveness analysis information")          \
2267                                                                            \
2268  notproduct(bool, TraceLivenessQuery, false,                               \
2269          "Trace queries of liveness analysis information")                 \
2270                                                                            \
2271  notproduct(bool, CollectIndexSetStatistics, false,                        \
2272          "Collect information about IndexSets")                            \
2273                                                                            \
2274  develop(bool, PrintDominators, false,                                     \
2275          "Print out dominator trees for GVN")                              \
2276                                                                            \
2277  develop(bool, UseLoopSafepoints, true,                                    \
2278          "Generate Safepoint nodes in every loop")                         \
2279                                                                            \
2280  notproduct(bool, TraceCISCSpill, false,                                   \
2281          "Trace allocators use of cisc spillable instructions")            \
2282                                                                            \
2283  notproduct(bool, TraceSpilling, false,                                    \
2284          "Trace spilling")                                                 \
2285                                                                            \
2286  develop(bool, DeutschShiffmanExceptions, true,                            \
2287          "Fast check to find exception handler for precisely typed "       \
2288          "exceptions")                                                     \
2289                                                                            \
2290  product(bool, SplitIfBlocks, true,                                        \
2291          "Clone compares and control flow through merge points to fold "   \
2292          "some branches")                                                  \
2293                                                                            \
2294  develop(intx, FastAllocateSizeLimit, 128*K,                               \
2295          /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2296          "Inline allocations larger than this in doublewords must go slow")\
2297                                                                            \
2298  product(bool, AggressiveOpts, false,                                      \
2299          "Enable aggressive optimizations - see arguments.cpp")            \
2300                                                                            \
2301  product(bool, UseStringCache, false,                                      \
2302          "Enable String cache capabilities on String.java")                \
2303                                                                            \
2304  /* statistics */                                                          \
2305  develop(bool, UseVTune, false,                                            \
2306          "enable support for Intel's VTune profiler")                      \
2307                                                                            \
2308  develop(bool, CountCompiledCalls, false,                                  \
2309          "counts method invocations")                                      \
2310                                                                            \
2311  notproduct(bool, CountRuntimeCalls, false,                                \
2312          "counts VM runtime calls")                                        \
2313                                                                            \
2314  develop(bool, CountJNICalls, false,                                       \
2315          "counts jni method invocations")                                  \
2316                                                                            \
2317  notproduct(bool, CountJVMCalls, false,                                    \
2318          "counts jvm method invocations")                                  \
2319                                                                            \
2320  notproduct(bool, CountRemovableExceptions, false,                         \
2321          "count exceptions that could be replaced by branches due to "     \
2322          "inlining")                                                       \
2323                                                                            \
2324  notproduct(bool, ICMissHistogram, false,                                  \
2325          "produce histogram of IC misses")                                 \
2326                                                                            \
2327  notproduct(bool, PrintClassStatistics, false,                             \
2328          "prints class statistics at end of run")                          \
2329                                                                            \
2330  notproduct(bool, PrintMethodStatistics, false,                            \
2331          "prints method statistics at end of run")                         \
2332                                                                            \
2333  /* interpreter */                                                         \
2334  develop(bool, ClearInterpreterLocals, false,                              \
2335          "Always clear local variables of interpreter activations upon "   \
2336          "entry")                                                          \
2337                                                                            \
2338  product_pd(bool, RewriteBytecodes,                                        \
2339          "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2340                                                                            \
2341  product_pd(bool, RewriteFrequentPairs,                                    \
2342          "Rewrite frequently used bytecode pairs into a single bytecode")  \
2343                                                                            \
2344  diagnostic(bool, PrintInterpreter, false,                                 \
2345          "Prints the generated interpreter code")                          \
2346                                                                            \
2347  product(bool, UseInterpreter, true,                                       \
2348          "Use interpreter for non-compiled methods")                       \
2349                                                                            \
2350  develop(bool, UseFastSignatureHandlers, true,                             \
2351          "Use fast signature handlers for native calls")                   \
2352                                                                            \
2353  develop(bool, UseV8InstrsOnly, false,                                     \
2354          "Use SPARC-V8 Compliant instruction subset")                      \
2355                                                                            \
2356  product(bool, UseNiagaraInstrs, false,                                    \
2357          "Use Niagara-efficient instruction subset")                       \
2358                                                                            \
2359  develop(bool, UseCASForSwap, false,                                       \
2360          "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2361                                                                            \
2362  product(bool, UseLoopCounter, true,                                       \
2363          "Increment invocation counter on backward branch")                \
2364                                                                            \
2365  product(bool, UseFastEmptyMethods, true,                                  \
2366          "Use fast method entry code for empty methods")                   \
2367                                                                            \
2368  product(bool, UseFastAccessorMethods, true,                               \
2369          "Use fast method entry code for accessor methods")                \
2370                                                                            \
2371  product_pd(bool, UseOnStackReplacement,                                   \
2372           "Use on stack replacement, calls runtime if invoc. counter "     \
2373           "overflows in loop")                                             \
2374                                                                            \
2375  notproduct(bool, TraceOnStackReplacement, false,                          \
2376          "Trace on stack replacement")                                     \
2377                                                                            \
2378  develop(bool, PoisonOSREntry, true,                                       \
2379           "Detect abnormal calls to OSR code")                             \
2380                                                                            \
2381  product_pd(bool, PreferInterpreterNativeStubs,                            \
2382          "Use always interpreter stubs for native methods invoked via "    \
2383          "interpreter")                                                    \
2384                                                                            \
2385  develop(bool, CountBytecodes, false,                                      \
2386          "Count number of bytecodes executed")                             \
2387                                                                            \
2388  develop(bool, PrintBytecodeHistogram, false,                              \
2389          "Print histogram of the executed bytecodes")                      \
2390                                                                            \
2391  develop(bool, PrintBytecodePairHistogram, false,                          \
2392          "Print histogram of the executed bytecode pairs")                 \
2393                                                                            \
2394  diagnostic(bool, PrintSignatureHandlers, false,                           \
2395          "Print code generated for native method signature handlers")      \
2396                                                                            \
2397  develop(bool, VerifyOops, false,                                          \
2398          "Do plausibility checks for oops")                                \
2399                                                                            \
2400  develop(bool, CheckUnhandledOops, false,                                  \
2401          "Check for unhandled oops in VM code")                            \
2402                                                                            \
2403  develop(bool, VerifyJNIFields, trueInDebug,                               \
2404          "Verify jfieldIDs for instance fields")                           \
2405                                                                            \
2406  notproduct(bool, VerifyJNIEnvThread, false,                               \
2407          "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2408          "from JNI")                                                       \
2409                                                                            \
2410  develop(bool, VerifyFPU, false,                                           \
2411          "Verify FPU state (check for NaN's, etc.)")                       \
2412                                                                            \
2413  develop(bool, VerifyThread, false,                                        \
2414          "Watch the thread register for corruption (SPARC only)")          \
2415                                                                            \
2416  develop(bool, VerifyActivationFrameSize, false,                           \
2417          "Verify that activation frame didn't become smaller than its "    \
2418          "minimal size")                                                   \
2419                                                                            \
2420  develop(bool, TraceFrequencyInlining, false,                              \
2421          "Trace frequency based inlining")                                 \
2422                                                                            \
2423  notproduct(bool, TraceTypeProfile, false,                                 \
2424          "Trace type profile")                                             \
2425                                                                            \
2426  develop_pd(bool, InlineIntrinsics,                                        \
2427           "Inline intrinsics that can be statically resolved")             \
2428                                                                            \
2429  product_pd(bool, ProfileInterpreter,                                      \
2430           "Profile at the bytecode level during interpretation")           \
2431                                                                            \
2432  develop_pd(bool, ProfileTraps,                                            \
2433          "Profile deoptimization traps at the bytecode level")             \
2434                                                                            \
2435  product(intx, ProfileMaturityPercentage, 20,                              \
2436          "number of method invocations/branches (expressed as % of "       \
2437          "CompileThreshold) before using the method's profile")            \
2438                                                                            \
2439  develop(bool, PrintMethodData, false,                                     \
2440           "Print the results of +ProfileInterpreter at end of run")        \
2441                                                                            \
2442  develop(bool, VerifyDataPointer, trueInDebug,                             \
2443          "Verify the method data pointer during interpreter profiling")    \
2444                                                                            \
2445  develop(bool, VerifyCompiledCode, false,                                  \
2446          "Include miscellaneous runtime verifications in nmethod code; "   \
2447          "off by default because it disturbs nmethod size heuristics.")    \
2448                                                                            \
2449                                                                            \
2450  /* compilation */                                                         \
2451  product(bool, UseCompiler, true,                                          \
2452          "use compilation")                                                \
2453                                                                            \
2454  develop(bool, TraceCompilationPolicy, false,                              \
2455          "Trace compilation policy")                                       \
2456                                                                            \
2457  develop(bool, TimeCompilationPolicy, false,                               \
2458          "Time the compilation policy")                                    \
2459                                                                            \
2460  product(bool, UseCounterDecay, true,                                      \
2461           "adjust recompilation counters")                                 \
2462                                                                            \
2463  develop(intx, CounterHalfLifeTime,    30,                                 \
2464          "half-life time of invocation counters (in secs)")                \
2465                                                                            \
2466  develop(intx, CounterDecayMinIntervalLength,   500,                       \
2467          "Min. ms. between invocation of CounterDecay")                    \
2468                                                                            \
2469  product(bool, AlwaysCompileLoopMethods, false,                            \
2470          "when using recompilation, never interpret methods "              \
2471          "containing loops")                                               \
2472                                                                            \
2473  product(bool, DontCompileHugeMethods, true,                               \
2474          "don't compile methods > HugeMethodLimit")                        \
2475                                                                            \
2476  /* Bytecode escape analysis estimation. */                                \
2477  product(bool, EstimateArgEscape, true,                                    \
2478          "Analyze bytecodes to estimate escape state of arguments")        \
2479                                                                            \
2480  product(intx, BCEATraceLevel, 0,                                          \
2481          "How much tracing to do of bytecode escape analysis estimates")   \
2482                                                                            \
2483  product(intx, MaxBCEAEstimateLevel, 5,                                    \
2484          "Maximum number of nested calls that are analyzed by BC EA.")     \
2485                                                                            \
2486  product(intx, MaxBCEAEstimateSize, 150,                                   \
2487          "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2488                                                                            \
2489  product(intx,  AllocatePrefetchStyle, 1,                                  \
2490          "0 = no prefetch, "                                               \
2491          "1 = prefetch instructions for each allocation, "                 \
2492          "2 = use TLAB watermark to gate allocation prefetch")             \
2493                                                                            \
2494  product(intx,  AllocatePrefetchDistance, -1,                              \
2495          "Distance to prefetch ahead of allocation pointer")               \
2496                                                                            \
2497  product(intx,  AllocatePrefetchLines, 1,                                  \
2498          "Number of lines to prefetch ahead of allocation pointer")        \
2499                                                                            \
2500  product(intx,  AllocatePrefetchStepSize, 16,                              \
2501          "Step size in bytes of sequential prefetch instructions")         \
2502                                                                            \
2503  product(intx,  AllocatePrefetchInstr, 0,                                  \
2504          "Prefetch instruction to prefetch ahead of allocation pointer")   \
2505                                                                            \
2506  product(intx,  ReadPrefetchInstr, 0,                                      \
2507          "Prefetch instruction to prefetch ahead")                         \
2508                                                                            \
2509  /* deoptimization */                                                      \
2510  develop(bool, TraceDeoptimization, false,                                 \
2511          "Trace deoptimization")                                           \
2512                                                                            \
2513  develop(bool, DebugDeoptimization, false,                                 \
2514          "Tracing various information while debugging deoptimization")     \
2515                                                                            \
2516  product(intx, SelfDestructTimer, 0,                                       \
2517          "Will cause VM to terminate after a given time (in minutes) "     \
2518          "(0 means off)")                                                  \
2519                                                                            \
2520  product(intx, MaxJavaStackTraceDepth, 1024,                               \
2521          "Max. no. of lines in the stack trace for Java exceptions "       \
2522          "(0 means all)")                                                  \
2523                                                                            \
2524  develop(intx, GuaranteedSafepointInterval, 1000,                          \
2525          "Guarantee a safepoint (at least) every so many milliseconds "    \
2526          "(0 means none)")                                                 \
2527                                                                            \
2528  product(intx, SafepointTimeoutDelay, 10000,                               \
2529          "Delay in milliseconds for option SafepointTimeout")              \
2530                                                                            \
2531  product(intx, NmethodSweepFraction, 4,                                    \
2532          "Number of invocations of sweeper to cover all nmethods")         \
2533                                                                            \
2534  notproduct(intx, MemProfilingInterval, 500,                               \
2535          "Time between each invocation of the MemProfiler")                \
2536                                                                            \
2537  develop(intx, MallocCatchPtr, -1,                                         \
2538          "Hit breakpoint when mallocing/freeing this pointer")             \
2539                                                                            \
2540  notproduct(intx, AssertRepeat, 1,                                         \
2541          "number of times to evaluate expression in assert "               \
2542          "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2543                                                                            \
2544  notproduct(ccstrlist, SuppressErrorAt, "",                                \
2545          "List of assertions (file:line) to muzzle")                       \
2546                                                                            \
2547  notproduct(uintx, HandleAllocationLimit, 1024,                            \
2548          "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2549          "is used")                                                        \
2550                                                                            \
2551  develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2552          "Threshold for total handle allocation when "                     \
2553          "+TraceHandleAllocation is used")                                 \
2554                                                                            \
2555  develop(intx, StackPrintLimit, 100,                                       \
2556          "number of stack frames to print in VM-level stack dump")         \
2557                                                                            \
2558  notproduct(intx, MaxElementPrintSize, 256,                                \
2559          "maximum number of elements to print")                            \
2560                                                                            \
2561  notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2562          "maximum number of subklasses to print when printing klass")      \
2563                                                                            \
2564  develop(intx, MaxInlineLevel, 9,                                          \
2565          "maximum number of nested calls that are inlined")                \
2566                                                                            \
2567  develop(intx, MaxRecursiveInlineLevel, 1,                                 \
2568          "maximum number of nested recursive calls that are inlined")      \
2569                                                                            \
2570  product(intx, InlineSmallCode, 1000,                                      \
2571          "Only inline already compiled methods if their code size is "     \
2572          "less than this")                                                 \
2573                                                                            \
2574  product(intx, MaxInlineSize, 35,                                          \
2575          "maximum bytecode size of a method to be inlined")                \
2576                                                                            \
2577  product_pd(intx, FreqInlineSize,                                          \
2578          "maximum bytecode size of a frequent method to be inlined")       \
2579                                                                            \
2580  develop(intx, MaxTrivialSize, 6,                                          \
2581          "maximum bytecode size of a trivial method to be inlined")        \
2582                                                                            \
2583  develop(intx, MinInliningThreshold, 250,                                  \
2584          "min. invocation count a method needs to have to be inlined")     \
2585                                                                            \
2586  develop(intx, AlignEntryCode, 4,                                          \
2587          "aligns entry code to specified value (in bytes)")                \
2588                                                                            \
2589  develop(intx, MethodHistogramCutoff, 100,                                 \
2590          "cutoff value for method invoc. histogram (+CountCalls)")         \
2591                                                                            \
2592  develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2593          "# of interpreted methods to show in profile")                    \
2594                                                                            \
2595  develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2596          "# of compiled methods to show in profile")                       \
2597                                                                            \
2598  develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2599          "# of stub methods to show in profile")                           \
2600                                                                            \
2601  develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2602          "# of runtime stub nodes to show in profile")                     \
2603                                                                            \
2604  product(intx, ProfileIntervalsTicks, 100,                                 \
2605          "# of ticks between printing of interval profile "                \
2606          "(+ProfileIntervals)")                                            \
2607                                                                            \
2608  notproduct(intx, ScavengeALotInterval,     1,                             \
2609          "Interval between which scavenge will occur with +ScavengeALot")  \
2610                                                                            \
2611  notproduct(intx, FullGCALotInterval,     1,                               \
2612          "Interval between which full gc will occur with +FullGCALot")     \
2613                                                                            \
2614  notproduct(intx, FullGCALotStart,     0,                                  \
2615          "For which invocation to start FullGCAlot")                       \
2616                                                                            \
2617  notproduct(intx, FullGCALotDummies,  32*K,                                \
2618          "Dummy object allocated with +FullGCALot, forcing all objects "   \
2619          "to move")                                                        \
2620                                                                            \
2621  develop(intx, DontYieldALotInterval,    10,                               \
2622          "Interval between which yields will be dropped (milliseconds)")   \
2623                                                                            \
2624  develop(intx, MinSleepInterval,     1,                                    \
2625          "Minimum sleep() interval (milliseconds) when "                   \
2626          "ConvertSleepToYield is off (used for SOLARIS)")                  \
2627                                                                            \
2628  product(intx, EventLogLength,  2000,                                      \
2629          "maximum nof events in event log")                                \
2630                                                                            \
2631  develop(intx, ProfilerPCTickThreshold,    15,                             \
2632          "Number of ticks in a PC buckets to be a hotspot")                \
2633                                                                            \
2634  notproduct(intx, DeoptimizeALotInterval,     5,                           \
2635          "Number of exits until DeoptimizeALot kicks in")                  \
2636                                                                            \
2637  notproduct(intx, ZombieALotInterval,     5,                               \
2638          "Number of exits until ZombieALot kicks in")                      \
2639                                                                            \
2640  develop(bool, StressNonEntrant, false,                                    \
2641          "Mark nmethods non-entrant at registration")                      \
2642                                                                            \
2643  diagnostic(intx, MallocVerifyInterval,     0,                             \
2644          "if non-zero, verify C heap after every N calls to "              \
2645          "malloc/realloc/free")                                            \
2646                                                                            \
2647  diagnostic(intx, MallocVerifyStart,     0,                                \
2648          "if non-zero, start verifying C heap after Nth call to "          \
2649          "malloc/realloc/free")                                            \
2650                                                                            \
2651  product(intx, TypeProfileWidth,      2,                                   \
2652          "number of receiver types to record in call/cast profile")        \
2653                                                                            \
2654  develop(intx, BciProfileWidth,      2,                                    \
2655          "number of return bci's to record in ret profile")                \
2656                                                                            \
2657  product(intx, PerMethodRecompilationCutoff, 400,                          \
2658          "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2659                                                                            \
2660  product(intx, PerBytecodeRecompilationCutoff, 100,                        \
2661          "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2662                                                                            \
2663  product(intx, PerMethodTrapLimit,  100,                                   \
2664          "Limit on traps (of one kind) in a method (includes inlines)")    \
2665                                                                            \
2666  product(intx, PerBytecodeTrapLimit,  4,                                   \
2667          "Limit on traps (of one kind) at a particular BCI")               \
2668                                                                            \
2669  develop(intx, FreqCountInvocations,  1,                                   \
2670          "Scaling factor for branch frequencies (deprecated)")             \
2671                                                                            \
2672  develop(intx, InlineFrequencyRatio,    20,                                \
2673          "Ratio of call site execution to caller method invocation")       \
2674                                                                            \
2675  develop_pd(intx, InlineFrequencyCount,                                    \
2676          "Count of call site execution necessary to trigger frequent "     \
2677          "inlining")                                                       \
2678                                                                            \
2679  develop(intx, InlineThrowCount,    50,                                    \
2680          "Force inlining of interpreted methods that throw this often")    \
2681                                                                            \
2682  develop(intx, InlineThrowMaxSize,   200,                                  \
2683          "Force inlining of throwing methods smaller than this")           \
2684                                                                            \
2685  product(intx, AliasLevel,     3,                                          \
2686          "0 for no aliasing, 1 for oop/field/static/array split, "         \
2687          "2 for class split, 3 for unique instances")                      \
2688                                                                            \
2689  develop(bool, VerifyAliases, false,                                       \
2690          "perform extra checks on the results of alias analysis")          \
2691                                                                            \
2692  develop(intx, ProfilerNodeSize,  1024,                                    \
2693          "Size in K to allocate for the Profile Nodes of each thread")     \
2694                                                                            \
2695  develop(intx, V8AtomicOperationUnderLockSpinCount,    50,                 \
2696          "Number of times to spin wait on a v8 atomic operation lock")     \
2697                                                                            \
2698  product(intx, ReadSpinIterations,   100,                                  \
2699          "Number of read attempts before a yield (spin inner loop)")       \
2700                                                                            \
2701  product_pd(intx, PreInflateSpin,                                          \
2702          "Number of times to spin wait before inflation")                  \
2703                                                                            \
2704  product(intx, PreBlockSpin,    10,                                        \
2705          "Number of times to spin in an inflated lock before going to "    \
2706          "an OS lock")                                                     \
2707                                                                            \
2708  /* gc parameters */                                                       \
2709  product(uintx, MaxHeapSize, ScaleForWordSize(64*M),                       \
2710          "Default maximum size for object heap (in bytes)")                \
2711                                                                            \
2712  product_pd(uintx, NewSize,                                                \
2713          "Default size of new generation (in bytes)")                      \
2714                                                                            \
2715  product(uintx, MaxNewSize, max_uintx,                                     \
2716          "Maximum size of new generation (in bytes)")                      \
2717                                                                            \
2718  product(uintx, PretenureSizeThreshold, 0,                                 \
2719          "Max size in bytes of objects allocated in DefNew generation")    \
2720                                                                            \
2721  product_pd(uintx, TLABSize,                                               \
2722          "Default (or starting) size of TLAB (in bytes)")                  \
2723                                                                            \
2724  product(uintx, MinTLABSize, 2*K,                                          \
2725          "Minimum allowed TLAB size (in bytes)")                           \
2726                                                                            \
2727  product(uintx, TLABAllocationWeight, 35,                                  \
2728          "Allocation averaging weight")                                    \
2729                                                                            \
2730  product(uintx, TLABWasteTargetPercent, 1,                                 \
2731          "Percentage of Eden that can be wasted")                          \
2732                                                                            \
2733  product(uintx, TLABRefillWasteFraction,    64,                            \
2734          "Max TLAB waste at a refill (internal fragmentation)")            \
2735                                                                            \
2736  product(uintx, TLABWasteIncrement,    4,                                  \
2737          "Increment allowed waste at slow allocation")                     \
2738                                                                            \
2739  product_pd(intx, SurvivorRatio,                                           \
2740          "Ratio of eden/survivor space size")                              \
2741                                                                            \
2742  product_pd(intx, NewRatio,                                                \
2743          "Ratio of new/old generation sizes")                              \
2744                                                                            \
2745  product(uintx, MaxLiveObjectEvacuationRatio, 100,                         \
2746          "Max percent of eden objects that will be live at scavenge")      \
2747                                                                            \
2748  product_pd(uintx, NewSizeThreadIncrease,                                  \
2749          "Additional size added to desired new generation size per "       \
2750          "non-daemon thread (in bytes)")                                   \
2751                                                                            \
2752  product(uintx, OldSize, ScaleForWordSize(4096*K),                         \
2753          "Default size of tenured generation (in bytes)")                  \
2754                                                                            \
2755  product_pd(uintx, PermSize,                                               \
2756          "Default size of permanent generation (in bytes)")                \
2757                                                                            \
2758  product_pd(uintx, MaxPermSize,                                            \
2759          "Maximum size of permanent generation (in bytes)")                \
2760                                                                            \
2761  product(uintx, MinHeapFreeRatio,    40,                                   \
2762          "Min percentage of heap free after GC to avoid expansion")        \
2763                                                                            \
2764  product(uintx, MaxHeapFreeRatio,    70,                                   \
2765          "Max percentage of heap free after GC to avoid shrinking")        \
2766                                                                            \
2767  product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
2768          "Number of milliseconds per MB of free space in the heap")        \
2769                                                                            \
2770  product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
2771          "Min change in heap space due to GC (in bytes)")                  \
2772                                                                            \
2773  product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K),             \
2774          "Min expansion of permanent heap (in bytes)")                     \
2775                                                                            \
2776  product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M),               \
2777          "Max expansion of permanent heap without full GC (in bytes)")     \
2778                                                                            \
2779  product(intx, QueuedAllocationWarningCount, 0,                            \
2780          "Number of times an allocation that queues behind a GC "          \
2781          "will retry before printing a warning")                           \
2782                                                                            \
2783  diagnostic(uintx, VerifyGCStartAt,   0,                                   \
2784          "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
2785                                                                            \
2786  diagnostic(intx, VerifyGCLevel,     0,                                    \
2787          "Generation level at which to start +VerifyBefore/AfterGC")       \
2788                                                                            \
2789  develop(uintx, ExitAfterGCNum,   0,                                       \
2790          "If non-zero, exit after this GC.")                               \
2791                                                                            \
2792  product(intx, MaxTenuringThreshold,    15,                                \
2793          "Maximum value for tenuring threshold")                           \
2794                                                                            \
2795  product(intx, InitialTenuringThreshold,     7,                            \
2796          "Initial value for tenuring threshold")                           \
2797                                                                            \
2798  product(intx, TargetSurvivorRatio,    50,                                 \
2799          "Desired percentage of survivor space used after scavenge")       \
2800                                                                            \
2801  product(uintx, MarkSweepDeadRatio,     5,                                 \
2802          "Percentage (0-100) of the old gen allowed as dead wood."         \
2803          "Serial mark sweep treats this as both the min and max value."    \
2804          "CMS uses this value only if it falls back to mark sweep."        \
2805          "Par compact uses a variable scale based on the density of the"   \
2806          "generation and treats this as the max value when the heap is"    \
2807          "either completely full or completely empty.  Par compact also"   \
2808          "has a smaller default value; see arguments.cpp.")                \
2809                                                                            \
2810  product(uintx, PermMarkSweepDeadRatio,    20,                             \
2811          "Percentage (0-100) of the perm gen allowed as dead wood."        \
2812          "See MarkSweepDeadRatio for collector-specific comments.")        \
2813                                                                            \
2814  product(intx, MarkSweepAlwaysCompactCount,     4,                         \
2815          "How often should we fully compact the heap (ignoring the dead "  \
2816          "space parameters)")                                              \
2817                                                                            \
2818  product(intx, PrintCMSStatistics, 0,                                      \
2819          "Statistics for CMS")                                             \
2820                                                                            \
2821  product(bool, PrintCMSInitiationStatistics, false,                        \
2822          "Statistics for initiating a CMS collection")                     \
2823                                                                            \
2824  product(intx, PrintFLSStatistics, 0,                                      \
2825          "Statistics for CMS' FreeListSpace")                              \
2826                                                                            \
2827  product(intx, PrintFLSCensus, 0,                                          \
2828          "Census for CMS' FreeListSpace")                                  \
2829                                                                            \
2830  develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
2831          "Delay in ms between expansion and allocation")                   \
2832                                                                            \
2833  product(intx, DeferThrSuspendLoopCount,     4000,                         \
2834          "(Unstable) Number of times to iterate in safepoint loop "        \
2835          " before blocking VM threads ")                                   \
2836                                                                            \
2837  product(intx, DeferPollingPageLoopCount,     -1,                          \
2838          "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
2839          "before changing safepoint polling page to RO ")                  \
2840                                                                            \
2841  product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
2842                                                                            \
2843  product(bool, UseDepthFirstScavengeOrder, true,                           \
2844          "true: the scavenge order will be depth-first, "                  \
2845          "false: the scavenge order will be breadth-first")                \
2846                                                                            \
2847  product(bool, PSChunkLargeArrays, true,                                   \
2848          "true: process large arrays in chunks")                           \
2849                                                                            \
2850  product(uintx, GCDrainStackTargetSize, 64,                                \
2851          "how many entries we'll try to leave on the stack during "        \
2852          "parallel GC")                                                    \
2853                                                                            \
2854  product(intx, DCQBarrierQueueBufferSize, 256,                             \
2855          "Number of elements in a dirty card queue buffer")                \
2856                                                                            \
2857  product(intx, DCQBarrierProcessCompletedThreshold, 5,                     \
2858          "Number of completed dirty card buffers to trigger processing.")  \
2859                                                                            \
2860  /* stack parameters */                                                    \
2861  product_pd(intx, StackYellowPages,                                        \
2862          "Number of yellow zone (recoverable overflows) pages")            \
2863                                                                            \
2864  product_pd(intx, StackRedPages,                                           \
2865          "Number of red zone (unrecoverable overflows) pages")             \
2866                                                                            \
2867  product_pd(intx, StackShadowPages,                                        \
2868          "Number of shadow zone (for overflow checking) pages"             \
2869          " this should exceed the depth of the VM and native call stack")  \
2870                                                                            \
2871  product_pd(intx, ThreadStackSize,                                         \
2872          "Thread Stack Size (in Kbytes)")                                  \
2873                                                                            \
2874  product_pd(intx, VMThreadStackSize,                                       \
2875          "Non-Java Thread Stack Size (in Kbytes)")                         \
2876                                                                            \
2877  product_pd(intx, CompilerThreadStackSize,                                 \
2878          "Compiler Thread Stack Size (in Kbytes)")                         \
2879                                                                            \
2880  develop_pd(uintx, JVMInvokeMethodSlack,                                   \
2881          "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
2882                                                                            \
2883  product(uintx, ThreadSafetyMargin, 50*M,                                  \
2884          "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
2885          "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
2886          "disable this feature")                                           \
2887                                                                            \
2888  /* code cache parameters */                                               \
2889  develop(uintx, CodeCacheSegmentSize, 64,                                  \
2890          "Code cache segment size (in bytes) - smallest unit of "          \
2891          "allocation")                                                     \
2892                                                                            \
2893  develop_pd(intx, CodeEntryAlignment,                                      \
2894          "Code entry alignment for generated code (in bytes)")             \
2895                                                                            \
2896  product_pd(uintx, InitialCodeCacheSize,                                   \
2897          "Initial code cache size (in bytes)")                             \
2898                                                                            \
2899  product_pd(uintx, ReservedCodeCacheSize,                                  \
2900          "Reserved code cache size (in bytes) - maximum code cache size")  \
2901                                                                            \
2902  product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
2903          "When less than X space left, we stop compiling.")                \
2904                                                                            \
2905  product_pd(uintx, CodeCacheExpansionSize,                                 \
2906          "Code cache expansion size (in bytes)")                           \
2907                                                                            \
2908  develop_pd(uintx, CodeCacheMinBlockLength,                                \
2909          "Minimum number of segments in a code cache block.")              \
2910                                                                            \
2911  notproduct(bool, ExitOnFullCodeCache, false,                              \
2912          "Exit the VM if we fill the code cache.")                         \
2913                                                                            \
2914  /* interpreter debugging */                                               \
2915  develop(intx, BinarySwitchThreshold, 5,                                   \
2916          "Minimal number of lookupswitch entries for rewriting to binary " \
2917          "switch")                                                         \
2918                                                                            \
2919  develop(intx, StopInterpreterAt, 0,                                       \
2920          "Stops interpreter execution at specified bytecode number")       \
2921                                                                            \
2922  develop(intx, TraceBytecodesAt, 0,                                        \
2923          "Traces bytecodes starting with specified bytecode number")       \
2924                                                                            \
2925  /* compiler interface */                                                  \
2926  develop(intx, CIStart, 0,                                                 \
2927          "the id of the first compilation to permit")                      \
2928                                                                            \
2929  develop(intx, CIStop,    -1,                                              \
2930          "the id of the last compilation to permit")                       \
2931                                                                            \
2932  develop(intx, CIStartOSR,     0,                                          \
2933          "the id of the first osr compilation to permit "                  \
2934          "(CICountOSR must be on)")                                        \
2935                                                                            \
2936  develop(intx, CIStopOSR,    -1,                                           \
2937          "the id of the last osr compilation to permit "                   \
2938          "(CICountOSR must be on)")                                        \
2939                                                                            \
2940  develop(intx, CIBreakAtOSR,    -1,                                        \
2941          "id of osr compilation to break at")                              \
2942                                                                            \
2943  develop(intx, CIBreakAt,    -1,                                           \
2944          "id of compilation to break at")                                  \
2945                                                                            \
2946  product(ccstrlist, CompileOnly, "",                                       \
2947          "List of methods (pkg/class.name) to restrict compilation to")    \
2948                                                                            \
2949  product(ccstr, CompileCommandFile, NULL,                                  \
2950          "Read compiler commands from this file [.hotspot_compiler]")      \
2951                                                                            \
2952  product(ccstrlist, CompileCommand, "",                                    \
2953          "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
2954                                                                            \
2955  product(bool, CICompilerCountPerCPU, false,                               \
2956          "1 compiler thread for log(N CPUs)")                              \
2957                                                                            \
2958  develop(intx, CIFireOOMAt,    -1,                                         \
2959          "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
2960          "(non-negative value throws OOM after this many CI accesses "     \
2961          "in each compile)")                                               \
2962                                                                            \
2963  develop(intx, CIFireOOMAtDelay, -1,                                       \
2964          "Wait for this many CI accesses to occur in all compiles before " \
2965          "beginning to throw OutOfMemoryErrors in each compile")           \
2966                                                                            \
2967  /* Priorities */                                                          \
2968  product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
2969                                                                            \
2970  product(intx, ThreadPriorityPolicy, 0,                                    \
2971          "0 : Normal.                                                     "\
2972          "    VM chooses priorities that are appropriate for normal       "\
2973          "    applications. On Solaris NORM_PRIORITY and above are mapped "\
2974          "    to normal native priority. Java priorities below NORM_PRIORITY"\
2975          "    map to lower native priority values. On Windows applications"\
2976          "    are allowed to use higher native priorities. However, with  "\
2977          "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
2978          "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
2979          "    interfere with system threads. On Linux thread priorities   "\
2980          "    are ignored because the OS does not support static priority "\
2981          "    in SCHED_OTHER scheduling class which is the only choice for"\
2982          "    non-root, non-realtime applications.                        "\
2983          "1 : Aggressive.                                                 "\
2984          "    Java thread priorities map over to the entire range of      "\
2985          "    native thread priorities. Higher Java thread priorities map "\
2986          "    to higher native thread priorities. This policy should be   "\
2987          "    used with care, as sometimes it can cause performance       "\
2988          "    degradation in the application and/or the entire system. On "\
2989          "    Linux this policy requires root privilege.")                 \
2990                                                                            \
2991  product(bool, ThreadPriorityVerbose, false,                               \
2992          "print priority changes")                                         \
2993                                                                            \
2994  product(intx, DefaultThreadPriority, -1,                                  \
2995          "what native priority threads run at if not specified elsewhere (-1 means no change)") \
2996                                                                            \
2997  product(intx, CompilerThreadPriority, -1,                                 \
2998          "what priority should compiler threads run at (-1 means no change)") \
2999                                                                            \
3000  product(intx, VMThreadPriority, -1,                                       \
3001          "what priority should VM threads run at (-1 means no change)")    \
3002                                                                            \
3003  product(bool, CompilerThreadHintNoPreempt, true,                          \
3004          "(Solaris only) Give compiler threads an extra quanta")           \
3005                                                                            \
3006  product(bool, VMThreadHintNoPreempt, false,                               \
3007          "(Solaris only) Give VM thread an extra quanta")                  \
3008                                                                            \
3009  product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3010  product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3011  product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3012  product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3013  product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3014  product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3015  product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3016  product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3017  product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3018  product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3019                                                                            \
3020  /* compiler debugging */                                                  \
3021  notproduct(intx, CompileTheWorldStartAt,     1,                           \
3022          "First class to consider when using +CompileTheWorld")            \
3023                                                                            \
3024  notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3025          "Last class to consider when using +CompileTheWorld")             \
3026                                                                            \
3027  develop(intx, NewCodeParameter,      0,                                   \
3028          "Testing Only: Create a dedicated integer parameter before "      \
3029          "putback")                                                        \
3030                                                                            \
3031  /* new oopmap storage allocation */                                       \
3032  develop(intx, MinOopMapAllocation,     8,                                 \
3033          "Minimum number of OopMap entries in an OopMapSet")               \
3034                                                                            \
3035  /* Background Compilation */                                              \
3036  develop(intx, LongCompileThreshold,     50,                               \
3037          "Used with +TraceLongCompiles")                                   \
3038                                                                            \
3039  product(intx, StarvationMonitorInterval,    200,                          \
3040          "Pause between each check in ms")                                 \
3041                                                                            \
3042  /* recompilation */                                                       \
3043  product_pd(intx, CompileThreshold,                                        \
3044          "number of interpreted method invocations before (re-)compiling") \
3045                                                                            \
3046  product_pd(intx, BackEdgeThreshold,                                       \
3047          "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3048                                                                            \
3049  product(intx, Tier1BytecodeLimit,      10,                                \
3050          "Must have at least this many bytecodes before tier1"             \
3051          "invocation counters are used")                                   \
3052                                                                            \
3053  product_pd(intx, Tier2CompileThreshold,                                   \
3054          "threshold at which a tier 2 compilation is invoked")             \
3055                                                                            \
3056  product_pd(intx, Tier2BackEdgeThreshold,                                  \
3057          "Back edge threshold at which a tier 2 compilation is invoked")   \
3058                                                                            \
3059  product_pd(intx, Tier3CompileThreshold,                                   \
3060          "threshold at which a tier 3 compilation is invoked")             \
3061                                                                            \
3062  product_pd(intx, Tier3BackEdgeThreshold,                                  \
3063          "Back edge threshold at which a tier 3 compilation is invoked")   \
3064                                                                            \
3065  product_pd(intx, Tier4CompileThreshold,                                   \
3066          "threshold at which a tier 4 compilation is invoked")             \
3067                                                                            \
3068  product_pd(intx, Tier4BackEdgeThreshold,                                  \
3069          "Back edge threshold at which a tier 4 compilation is invoked")   \
3070                                                                            \
3071  product_pd(bool, TieredCompilation,                                       \
3072          "Enable two-tier compilation")                                    \
3073                                                                            \
3074  product(bool, StressTieredRuntime, false,                                 \
3075          "Alternate client and server compiler on compile requests")       \
3076                                                                            \
3077  product_pd(intx, OnStackReplacePercentage,                                \
3078          "NON_TIERED number of method invocations/branches (expressed as %"\
3079          "of CompileThreshold) before (re-)compiling OSR code")            \
3080                                                                            \
3081  product(intx, InterpreterProfilePercentage, 33,                           \
3082          "NON_TIERED number of method invocations/branches (expressed as %"\
3083          "of CompileThreshold) before profiling in the interpreter")       \
3084                                                                            \
3085  develop(intx, MaxRecompilationSearchLength,    10,                        \
3086          "max. # frames to inspect searching for recompilee")              \
3087                                                                            \
3088  develop(intx, MaxInterpretedSearchLength,     3,                          \
3089          "max. # interp. frames to skip when searching for recompilee")    \
3090                                                                            \
3091  develop(intx, DesiredMethodLimit,  8000,                                  \
3092          "desired max. method size (in bytecodes) after inlining")         \
3093                                                                            \
3094  develop(intx, HugeMethodLimit,  8000,                                     \
3095          "don't compile methods larger than this if "                      \
3096          "+DontCompileHugeMethods")                                        \
3097                                                                            \
3098  /* New JDK 1.4 reflection implementation */                               \
3099                                                                            \
3100  develop(bool, UseNewReflection, true,                                     \
3101          "Temporary flag for transition to reflection based on dynamic "   \
3102          "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3103          "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3104          "changes were needed")                                            \
3105                                                                            \
3106  develop(bool, VerifyReflectionBytecodes, false,                           \
3107          "Force verification of 1.4 reflection bytecodes. Does not work "  \
3108          "in situations like that described in 4486457 or for "            \
3109          "constructors generated for serialization, so can not be enabled "\
3110          "in product.")                                                    \
3111                                                                            \
3112  product(bool, ReflectionWrapResolutionErrors, true,                       \
3113          "Temporary flag for transition to AbstractMethodError wrapped "   \
3114          "in InvocationTargetException. See 6531596")                      \
3115                                                                            \
3116                                                                            \
3117  develop(intx, FastSuperclassLimit, 8,                                     \
3118          "Depth of hardwired instanceof accelerator array")                \
3119                                                                            \
3120  /* Properties for Java libraries  */                                      \
3121                                                                            \
3122  product(intx, MaxDirectMemorySize, -1,                                    \
3123          "Maximum total size of NIO direct-buffer allocations")            \
3124                                                                            \
3125  /* temporary developer defined flags  */                                  \
3126                                                                            \
3127  diagnostic(bool, UseNewCode, false,                                       \
3128          "Testing Only: Use the new version while testing")                \
3129                                                                            \
3130  diagnostic(bool, UseNewCode2, false,                                      \
3131          "Testing Only: Use the new version while testing")                \
3132                                                                            \
3133  diagnostic(bool, UseNewCode3, false,                                      \
3134          "Testing Only: Use the new version while testing")                \
3135                                                                            \
3136  /* flags for performance data collection */                               \
3137                                                                            \
3138  product(bool, UsePerfData, true,                                          \
3139          "Flag to disable jvmstat instrumentation for performance testing" \
3140          "and problem isolation purposes.")                                \
3141                                                                            \
3142  product(bool, PerfDataSaveToFile, false,                                  \
3143          "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3144                                                                            \
3145  product(ccstr, PerfDataSaveFile, NULL,                                    \
3146          "Save PerfData memory to the specified absolute pathname,"        \
3147           "%p in the file name if present will be replaced by pid")        \
3148                                                                            \
3149  product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3150          "Data sampling interval in milliseconds")                         \
3151                                                                            \
3152  develop(bool, PerfTraceDataCreation, false,                               \
3153          "Trace creation of Performance Data Entries")                     \
3154                                                                            \
3155  develop(bool, PerfTraceMemOps, false,                                     \
3156          "Trace PerfMemory create/attach/detach calls")                    \
3157                                                                            \
3158  product(bool, PerfDisableSharedMem, false,                                \
3159          "Store performance data in standard memory")                      \
3160                                                                            \
3161  product(intx, PerfDataMemorySize, 32*K,                                   \
3162          "Size of performance data memory region. Will be rounded "        \
3163          "up to a multiple of the native os page size.")                   \
3164                                                                            \
3165  product(intx, PerfMaxStringConstLength, 1024,                             \
3166          "Maximum PerfStringConstant string length before truncation")     \
3167                                                                            \
3168  product(bool, PerfAllowAtExitRegistration, false,                         \
3169          "Allow registration of atexit() methods")                         \
3170                                                                            \
3171  product(bool, PerfBypassFileSystemCheck, false,                           \
3172          "Bypass Win32 file system criteria checks (Windows Only)")        \
3173                                                                            \
3174  product(intx, UnguardOnExecutionViolation, 0,                             \
3175          "Unguard page and retry on no-execute fault (Win32 only)"         \
3176          "0=off, 1=conservative, 2=aggressive")                            \
3177                                                                            \
3178  /* Serviceability Support */                                              \
3179                                                                            \
3180  product(bool, ManagementServer, false,                                    \
3181          "Create JMX Management Server")                                   \
3182                                                                            \
3183  product(bool, DisableAttachMechanism, false,                              \
3184         "Disable mechanism that allows tools to attach to this VM")        \
3185                                                                            \
3186  product(bool, StartAttachListener, false,                                 \
3187          "Always start Attach Listener at VM startup")                     \
3188                                                                            \
3189  manageable(bool, PrintConcurrentLocks, false,                             \
3190          "Print java.util.concurrent locks in thread dump")                \
3191                                                                            \
3192  /* Shared spaces */                                                       \
3193                                                                            \
3194  product(bool, UseSharedSpaces, true,                                      \
3195          "Use shared spaces in the permanent generation")                  \
3196                                                                            \
3197  product(bool, RequireSharedSpaces, false,                                 \
3198          "Require shared spaces in the permanent generation")              \
3199                                                                            \
3200  product(bool, ForceSharedSpaces, false,                                   \
3201          "Require shared spaces in the permanent generation")              \
3202                                                                            \
3203  product(bool, DumpSharedSpaces, false,                                    \
3204           "Special mode: JVM reads a class list, loads classes, builds "   \
3205            "shared spaces, and dumps the shared spaces to a file to be "   \
3206            "used in future JVM runs.")                                     \
3207                                                                            \
3208  product(bool, PrintSharedSpaces, false,                                   \
3209          "Print usage of shared spaces")                                   \
3210                                                                            \
3211  product(uintx, SharedDummyBlockSize, 512*M,                               \
3212          "Size of dummy block used to shift heap addresses (in bytes)")    \
3213                                                                            \
3214  product(uintx, SharedReadWriteSize,  12*M,                                \
3215          "Size of read-write space in permanent generation (in bytes)")    \
3216                                                                            \
3217  product(uintx, SharedReadOnlySize,    8*M,                                \
3218          "Size of read-only space in permanent generation (in bytes)")     \
3219                                                                            \
3220  product(uintx, SharedMiscDataSize,    4*M,                                \
3221          "Size of the shared data area adjacent to the heap (in bytes)")   \
3222                                                                            \
3223  product(uintx, SharedMiscCodeSize,    4*M,                                \
3224          "Size of the shared code area adjacent to the heap (in bytes)")   \
3225                                                                            \
3226  diagnostic(bool, SharedOptimizeColdStart, true,                           \
3227          "At dump time, order shared objects to achieve better "           \
3228          "cold startup time.")                                             \
3229                                                                            \
3230  develop(intx, SharedOptimizeColdStartPolicy, 2,                           \
3231          "Reordering policy for SharedOptimizeColdStart "                  \
3232          "0=favor classload-time locality, 1=balanced, "                   \
3233          "2=favor runtime locality")                                       \
3234                                                                            \
3235  diagnostic(bool, SharedSkipVerify, false,                                 \
3236          "Skip assert() and verify() which page-in unwanted shared "       \
3237          "objects. ")                                                      \
3238                                                                            \
3239  product(bool, AnonymousClasses, false,                                    \
3240          "support sun.misc.Unsafe.defineAnonymousClass")                   \
3241                                                                            \
3242  product(bool, TaggedStackInterpreter, false,                              \
3243          "Insert tags in interpreter execution stack for oopmap generaion")\
3244                                                                            \
3245  diagnostic(bool, PauseAtStartup,      false,                              \
3246          "Causes the VM to pause at startup time and wait for the pause "  \
3247          "file to be removed (default: ./vm.paused.<pid>)")                \
3248                                                                            \
3249  diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3250          "The file to create and for whose removal to await when pausing " \
3251          "at startup. (default: ./vm.paused.<pid>)")                       \
3252                                                                            \
3253  product(bool, ExtendedDTraceProbes,    false,                             \
3254          "Enable performance-impacting dtrace probes")                     \
3255                                                                            \
3256  product(bool, DTraceMethodProbes, false,                                  \
3257          "Enable dtrace probes for method-entry and method-exit")          \
3258                                                                            \
3259  product(bool, DTraceAllocProbes, false,                                   \
3260          "Enable dtrace probes for object allocation")                     \
3261                                                                            \
3262  product(bool, DTraceMonitorProbes, false,                                 \
3263          "Enable dtrace probes for monitor events")                        \
3264                                                                            \
3265  product(bool, RelaxAccessControlCheck, false,                             \
3266          "Relax the access control checks in the verifier")                \
3267                                                                            \
3268  diagnostic(bool, PrintDTraceDOF, false,                                   \
3269             "Print the DTrace DOF passed to the system for JSDT probes")   \
3270                                                                            \
3271  product(bool, UseVMInterruptibleIO, false,                                \
3272          "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3273          "EINTR for I/O operations results in OS_INTRPT. The default value"\
3274          " of this flag is true for JDK 6 and earliers")
3275
3276
3277/*
3278 *  Macros for factoring of globals
3279 */
3280
3281// Interface macros
3282#define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3283#define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3284#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3285#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3286#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3287#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3288#ifdef PRODUCT
3289#define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3290#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3291#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3292#else
3293#define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3294#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3295#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3296#endif
3297// Special LP64 flags, product only needed for now.
3298#ifdef _LP64
3299#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3300#else
3301#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3302#endif // _LP64
3303
3304// Implementation macros
3305#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3306#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3307#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3308#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3309#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3310#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3311#ifdef PRODUCT
3312#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3313#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3314#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3315#else
3316#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3317#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3318#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3319#endif
3320#ifdef _LP64
3321#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3322#else
3323#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3324#endif // _LP64
3325
3326RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3327
3328RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3329