globals.hpp revision 1145:e018e6884bd8
1101267Stjr/* 2118589Stjr * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3101267Stjr * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4101267Stjr * 5227753Stheraven * This code is free software; you can redistribute it and/or modify it 6227753Stheraven * under the terms of the GNU General Public License version 2 only, as 7227753Stheraven * published by the Free Software Foundation. 8227753Stheraven * 9227753Stheraven * This code is distributed in the hope that it will be useful, but WITHOUT 10101267Stjr * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11101267Stjr * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12101267Stjr * version 2 for more details (a copy is included in the LICENSE file that 13101267Stjr * accompanied this code). 14101267Stjr * 15101267Stjr * You should have received a copy of the GNU General Public License version 16101267Stjr * 2 along with this work; if not, write to the Free Software Foundation, 17101267Stjr * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18101267Stjr * 19101267Stjr * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20101267Stjr * CA 95054 USA or visit www.sun.com if you need additional information or 21101267Stjr * have any questions. 22101267Stjr * 23101267Stjr */ 24101267Stjr 25101267Stjr#if !defined(COMPILER1) && !defined(COMPILER2) 26101267Stjrdefine_pd_global(bool, BackgroundCompilation, false); 27101267Stjrdefine_pd_global(bool, UseTLAB, false); 28101267Stjrdefine_pd_global(bool, CICompileOSR, false); 29101267Stjrdefine_pd_global(bool, UseTypeProfile, false); 30101267Stjrdefine_pd_global(bool, UseOnStackReplacement, false); 31101267Stjrdefine_pd_global(bool, InlineIntrinsics, false); 32101267Stjrdefine_pd_global(bool, PreferInterpreterNativeStubs, true); 33101267Stjrdefine_pd_global(bool, ProfileInterpreter, false); 34101267Stjrdefine_pd_global(bool, ProfileTraps, false); 35118589Stjrdefine_pd_global(bool, TieredCompilation, false); 36101267Stjr 37129154Stjrdefine_pd_global(intx, CompileThreshold, 0); 38101267Stjrdefine_pd_global(intx, Tier2CompileThreshold, 0); 39101267Stjrdefine_pd_global(intx, Tier3CompileThreshold, 0); 40227753Stheravendefine_pd_global(intx, Tier4CompileThreshold, 0); 41101267Stjr 42127944Stjrdefine_pd_global(intx, BackEdgeThreshold, 0); 43127944Stjrdefine_pd_global(intx, Tier2BackEdgeThreshold, 0); 44101267Stjrdefine_pd_global(intx, Tier3BackEdgeThreshold, 0); 45118589Stjrdefine_pd_global(intx, Tier4BackEdgeThreshold, 0); 46227753Stheraven 47101267Stjrdefine_pd_global(intx, OnStackReplacePercentage, 0); 48101267Stjrdefine_pd_global(bool, ResizeTLAB, false); 49101267Stjrdefine_pd_global(intx, FreqInlineSize, 0); 50118589Stjrdefine_pd_global(intx, InlineSmallCode, 0); 51118589Stjrdefine_pd_global(intx, NewSizeThreadIncrease, 4*K); 52118589Stjrdefine_pd_global(intx, InlineClassNatives, true); 53118589Stjrdefine_pd_global(intx, InlineUnsafeOps, true); 54118589Stjrdefine_pd_global(intx, InitialCodeCacheSize, 160*K); 55127944Stjrdefine_pd_global(intx, ReservedCodeCacheSize, 32*M); 56227753Stheravendefine_pd_global(intx, CodeCacheExpansionSize, 32*K); 57101267Stjrdefine_pd_global(intx, CodeCacheMinBlockLength, 1); 58118589Stjrdefine_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 59101267Stjrdefine_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 60227753Stheravendefine_pd_global(bool, NeverActAsServerClassMachine, true); 61227753Stheravendefine_pd_global(uint64_t,MaxRAM, 1ULL*G); 62227753Stheraven#define CI_COMPILER_COUNT 0 63227753Stheraven#else 64227753Stheraven 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_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 117 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 118 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 119 120 bool is_double() const { return strcmp(type, "double") == 0; } 121 double get_double() const { return *((double*) addr); } 122 void set_double(double value) { *((double*) addr) = value; } 123 124 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 125 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 126 ccstr get_ccstr() const { return *((ccstr*) addr); } 127 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 128 129 bool is_unlocker() const; 130 bool is_unlocked() const; 131 bool is_writeable() const; 132 bool is_external() const; 133 134 void print_on(outputStream* st); 135 void print_as_flag(outputStream* st); 136}; 137 138// debug flags control various aspects of the VM and are global accessible 139 140// use FlagSetting to temporarily change some debug flag 141// e.g. FlagSetting fs(DebugThisAndThat, true); 142// restored to previous value upon leaving scope 143class FlagSetting { 144 bool val; 145 bool* flag; 146 public: 147 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 148 ~FlagSetting() { *flag = val; } 149}; 150 151 152class CounterSetting { 153 intx* counter; 154 public: 155 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 156 ~CounterSetting() { (*counter)--; } 157}; 158 159 160class IntFlagSetting { 161 intx val; 162 intx* flag; 163 public: 164 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 165 ~IntFlagSetting() { *flag = val; } 166}; 167 168 169class DoubleFlagSetting { 170 double val; 171 double* flag; 172 public: 173 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 174 ~DoubleFlagSetting() { *flag = val; } 175}; 176 177 178class CommandLineFlags { 179 public: 180 static bool boolAt(char* name, size_t len, bool* value); 181 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 182 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 183 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 184 185 static bool intxAt(char* name, size_t len, intx* value); 186 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 187 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 188 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 189 190 static bool uintxAt(char* name, size_t len, uintx* value); 191 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 192 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 193 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 194 195 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 196 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 197 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 198 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 199 200 static bool doubleAt(char* name, size_t len, double* value); 201 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 202 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 203 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 204 205 static bool ccstrAt(char* name, size_t len, ccstr* value); 206 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 207 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 208 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 209 210 // Returns false if name is not a command line flag. 211 static bool wasSetOnCmdline(const char* name, bool* value); 212 static void printSetFlags(); 213 214 static void printFlags() PRODUCT_RETURN; 215 216 static void verify() PRODUCT_RETURN; 217}; 218 219// use this for flags that are true by default in the debug version but 220// false in the optimized version, and vice versa 221#ifdef ASSERT 222#define trueInDebug true 223#define falseInDebug false 224#else 225#define trueInDebug false 226#define falseInDebug true 227#endif 228 229// use this for flags that are true per default in the product build 230// but false in development builds, and vice versa 231#ifdef PRODUCT 232#define trueInProduct true 233#define falseInProduct false 234#else 235#define trueInProduct false 236#define falseInProduct true 237#endif 238 239// use this for flags that are true per default in the tiered build 240// but false in non-tiered builds, and vice versa 241#ifdef TIERED 242#define trueInTiered true 243#define falseInTiered false 244#else 245#define trueInTiered false 246#define falseInTiered true 247#endif 248 249// develop flags are settable / visible only during development and are constant in the PRODUCT version 250// product flags are always settable / visible 251// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 252 253// A flag must be declared with one of the following types: 254// bool, intx, uintx, ccstr. 255// The type "ccstr" is an alias for "const char*" and is used 256// only in this file, because the macrology requires single-token type names. 257 258// Note: Diagnostic options not meant for VM tuning or for product modes. 259// They are to be used for VM quality assurance or field diagnosis 260// of VM bugs. They are hidden so that users will not be encouraged to 261// try them as if they were VM ordinary execution options. However, they 262// are available in the product version of the VM. Under instruction 263// from support engineers, VM customers can turn them on to collect 264// diagnostic information about VM problems. To use a VM diagnostic 265// option, you must first specify +UnlockDiagnosticVMOptions. 266// (This master switch also affects the behavior of -Xprintflags.) 267// 268// experimental flags are in support of features that are not 269// part of the officially supported product, but are available 270// for experimenting with. They could, for example, be performance 271// features that may not have undergone full or rigorous QA, but which may 272// help performance in some cases and released for experimentation 273// by the community of users and developers. This flag also allows one to 274// be able to build a fully supported product that nonetheless also 275// ships with some unsupported, lightly tested, experimental features. 276// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 277// UnlockExperimentalVMOptions flag, which allows the control and 278// modification of the experimental flags. 279// 280// manageable flags are writeable external product flags. 281// They are dynamically writeable through the JDK management interface 282// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 283// These flags are external exported interface (see CCC). The list of 284// manageable flags can be queried programmatically through the management 285// interface. 286// 287// A flag can be made as "manageable" only if 288// - the flag is defined in a CCC as an external exported interface. 289// - the VM implementation supports dynamic setting of the flag. 290// This implies that the VM must *always* query the flag variable 291// and not reuse state related to the flag state at any given time. 292// - you want the flag to be queried programmatically by the customers. 293// 294// product_rw flags are writeable internal product flags. 295// They are like "manageable" flags but for internal/private use. 296// The list of product_rw flags are internal/private flags which 297// may be changed/removed in a future release. It can be set 298// through the management interface to get/set value 299// when the name of flag is supplied. 300// 301// A flag can be made as "product_rw" only if 302// - the VM implementation supports dynamic setting of the flag. 303// This implies that the VM must *always* query the flag variable 304// and not reuse state related to the flag state at any given time. 305// 306// Note that when there is a need to support develop flags to be writeable, 307// it can be done in the same way as product_rw. 308 309#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 310 \ 311 lp64_product(bool, UseCompressedOops, false, \ 312 "Use 32-bit object references in 64-bit VM. " \ 313 "lp64_product means flag is always constant in 32 bit VM") \ 314 \ 315 notproduct(bool, CheckCompressedOops, true, \ 316 "generate checks in encoding/decoding code in debug VM") \ 317 \ 318 product_pd(uintx, HeapBaseMinAddress, \ 319 "OS specific low limit for heap base address") \ 320 \ 321 diagnostic(bool, PrintCompressedOopsMode, false, \ 322 "Print compressed oops base address and encoding mode") \ 323 \ 324 /* UseMembar is theoretically a temp flag used for memory barrier \ 325 * removal testing. It was supposed to be removed before FCS but has \ 326 * been re-added (see 6401008) */ \ 327 product(bool, UseMembar, false, \ 328 "(Unstable) Issues membars on thread state transitions") \ 329 \ 330 product(bool, PrintCommandLineFlags, false, \ 331 "Prints flags that appeared on the command line") \ 332 \ 333 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 334 "Enable normal processing of flags relating to field diagnostics")\ 335 \ 336 experimental(bool, UnlockExperimentalVMOptions, false, \ 337 "Enable normal processing of flags relating to experimental features")\ 338 \ 339 product(bool, JavaMonitorsInStackTrace, true, \ 340 "Print info. about Java monitor locks when the stacks are dumped")\ 341 \ 342 product_pd(bool, UseLargePages, \ 343 "Use large page memory") \ 344 \ 345 product_pd(bool, UseLargePagesIndividualAllocation, \ 346 "Allocate large pages individually for better affinity") \ 347 \ 348 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 349 "Fail large pages individual allocation") \ 350 \ 351 develop(bool, TracePageSizes, false, \ 352 "Trace page size selection and usage.") \ 353 \ 354 product(bool, UseNUMA, false, \ 355 "Use NUMA if available") \ 356 \ 357 product(bool, ForceNUMA, false, \ 358 "Force NUMA optimizations on single-node/UMA systems") \ 359 \ 360 product(intx, NUMAChunkResizeWeight, 20, \ 361 "Percentage (0-100) used to weight the current sample when " \ 362 "computing exponentially decaying average for " \ 363 "AdaptiveNUMAChunkSizing") \ 364 \ 365 product(intx, NUMASpaceResizeRate, 1*G, \ 366 "Do not reallocate more that this amount per collection") \ 367 \ 368 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 369 "Enable adaptive chunk sizing for NUMA") \ 370 \ 371 product(bool, NUMAStats, false, \ 372 "Print NUMA stats in detailed heap information") \ 373 \ 374 product(intx, NUMAPageScanRate, 256, \ 375 "Maximum number of pages to include in the page scan procedure") \ 376 \ 377 product_pd(bool, NeedsDeoptSuspend, \ 378 "True for register window machines (sparc/ia64)") \ 379 \ 380 product(intx, UseSSE, 99, \ 381 "Highest supported SSE instructions set on x86/x64") \ 382 \ 383 product(uintx, LargePageSizeInBytes, 0, \ 384 "Large page size (0 to let VM choose the page size") \ 385 \ 386 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 387 "Use large pages if max heap is at least this big") \ 388 \ 389 product(bool, ForceTimeHighResolution, false, \ 390 "Using high time resolution(For Win32 only)") \ 391 \ 392 develop(bool, TraceItables, false, \ 393 "Trace initialization and use of itables") \ 394 \ 395 develop(bool, TracePcPatching, false, \ 396 "Trace usage of frame::patch_pc") \ 397 \ 398 develop(bool, TraceJumps, false, \ 399 "Trace assembly jumps in thread ring buffer") \ 400 \ 401 develop(bool, TraceRelocator, false, \ 402 "Trace the bytecode relocator") \ 403 \ 404 develop(bool, TraceLongCompiles, false, \ 405 "Print out every time compilation is longer than " \ 406 "a given threashold") \ 407 \ 408 develop(bool, SafepointALot, false, \ 409 "Generates a lot of safepoints. Works with " \ 410 "GuaranteedSafepointInterval") \ 411 \ 412 product_pd(bool, BackgroundCompilation, \ 413 "A thread requesting compilation is not blocked during " \ 414 "compilation") \ 415 \ 416 product(bool, PrintVMQWaitTime, false, \ 417 "Prints out the waiting time in VM operation queue") \ 418 \ 419 develop(bool, BailoutToInterpreterForThrows, false, \ 420 "Compiled methods which throws/catches exceptions will be " \ 421 "deopt and intp.") \ 422 \ 423 develop(bool, NoYieldsInMicrolock, false, \ 424 "Disable yields in microlock") \ 425 \ 426 develop(bool, TraceOopMapGeneration, false, \ 427 "Shows oopmap generation") \ 428 \ 429 product(bool, MethodFlushing, true, \ 430 "Reclamation of zombie and not-entrant methods") \ 431 \ 432 develop(bool, VerifyStack, false, \ 433 "Verify stack of each thread when it is entering a runtime call") \ 434 \ 435 develop(bool, ForceUnreachable, false, \ 436 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 437 \ 438 notproduct(bool, StressDerivedPointers, false, \ 439 "Force scavenge when a derived pointers is detected on stack " \ 440 "after rtm call") \ 441 \ 442 develop(bool, TraceDerivedPointers, false, \ 443 "Trace traversal of derived pointers on stack") \ 444 \ 445 notproduct(bool, TraceCodeBlobStacks, false, \ 446 "Trace stack-walk of codeblobs") \ 447 \ 448 product(bool, PrintJNIResolving, false, \ 449 "Used to implement -v:jni") \ 450 \ 451 notproduct(bool, PrintRewrites, false, \ 452 "Print methods that are being rewritten") \ 453 \ 454 product(bool, UseInlineCaches, true, \ 455 "Use Inline Caches for virtual calls ") \ 456 \ 457 develop(bool, InlineArrayCopy, true, \ 458 "inline arraycopy native that is known to be part of " \ 459 "base library DLL") \ 460 \ 461 develop(bool, InlineObjectHash, true, \ 462 "inline Object::hashCode() native that is known to be part " \ 463 "of base library DLL") \ 464 \ 465 develop(bool, InlineObjectCopy, true, \ 466 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 467 \ 468 develop(bool, InlineNatives, true, \ 469 "inline natives that are known to be part of base library DLL") \ 470 \ 471 develop(bool, InlineMathNatives, true, \ 472 "inline SinD, CosD, etc.") \ 473 \ 474 develop(bool, InlineClassNatives, true, \ 475 "inline Class.isInstance, etc") \ 476 \ 477 develop(bool, InlineAtomicLong, true, \ 478 "inline sun.misc.AtomicLong") \ 479 \ 480 develop(bool, InlineThreadNatives, true, \ 481 "inline Thread.currentThread, etc") \ 482 \ 483 develop(bool, InlineReflectionGetCallerClass, true, \ 484 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 485 "of base library DLL") \ 486 \ 487 develop(bool, InlineUnsafeOps, true, \ 488 "inline memory ops (native methods) from sun.misc.Unsafe") \ 489 \ 490 develop(bool, ConvertCmpD2CmpF, true, \ 491 "Convert cmpD to cmpF when one input is constant in float range") \ 492 \ 493 develop(bool, ConvertFloat2IntClipping, true, \ 494 "Convert float2int clipping idiom to integer clipping") \ 495 \ 496 develop(bool, SpecialStringCompareTo, true, \ 497 "special version of string compareTo") \ 498 \ 499 develop(bool, SpecialStringIndexOf, true, \ 500 "special version of string indexOf") \ 501 \ 502 develop(bool, SpecialStringEquals, true, \ 503 "special version of string equals") \ 504 \ 505 develop(bool, SpecialArraysEquals, true, \ 506 "special version of Arrays.equals(char[],char[])") \ 507 \ 508 product(bool, UseSSE42Intrinsics, false, \ 509 "SSE4.2 versions of intrinsics") \ 510 \ 511 develop(bool, TraceCallFixup, false, \ 512 "traces all call fixups") \ 513 \ 514 develop(bool, DeoptimizeALot, false, \ 515 "deoptimize at every exit from the runtime system") \ 516 \ 517 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 518 "a comma separated list of bcis to deoptimize at") \ 519 \ 520 product(bool, DeoptimizeRandom, false, \ 521 "deoptimize random frames on random exit from the runtime system")\ 522 \ 523 notproduct(bool, ZombieALot, false, \ 524 "creates zombies (non-entrant) at exit from the runt. system") \ 525 \ 526 notproduct(bool, WalkStackALot, false, \ 527 "trace stack (no print) at every exit from the runtime system") \ 528 \ 529 develop(bool, Debugging, false, \ 530 "set when executing debug methods in debug.ccp " \ 531 "(to prevent triggering assertions)") \ 532 \ 533 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 534 "Enable strict checks that safepoints cannot happen for threads " \ 535 "that used No_Safepoint_Verifier") \ 536 \ 537 notproduct(bool, VerifyLastFrame, false, \ 538 "Verify oops on last frame on entry to VM") \ 539 \ 540 develop(bool, TraceHandleAllocation, false, \ 541 "Prints out warnings when suspicious many handles are allocated") \ 542 \ 543 product(bool, UseCompilerSafepoints, true, \ 544 "Stop at safepoints in compiled code") \ 545 \ 546 product(bool, UseSplitVerifier, true, \ 547 "use split verifier with StackMapTable attributes") \ 548 \ 549 product(bool, FailOverToOldVerifier, true, \ 550 "fail over to old verifier when split verifier fails") \ 551 \ 552 develop(bool, ShowSafepointMsgs, false, \ 553 "Show msg. about safepoint synch.") \ 554 \ 555 product(bool, SafepointTimeout, false, \ 556 "Time out and warn or fail after SafepointTimeoutDelay " \ 557 "milliseconds if failed to reach safepoint") \ 558 \ 559 develop(bool, DieOnSafepointTimeout, false, \ 560 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 561 \ 562 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 563 /* typically, at most a few retries are needed */ \ 564 product(intx, SuspendRetryCount, 50, \ 565 "Maximum retry count for an external suspend request") \ 566 \ 567 product(intx, SuspendRetryDelay, 5, \ 568 "Milliseconds to delay per retry (* current_retry_count)") \ 569 \ 570 product(bool, AssertOnSuspendWaitFailure, false, \ 571 "Assert/Guarantee on external suspend wait failure") \ 572 \ 573 product(bool, TraceSuspendWaitFailures, false, \ 574 "Trace external suspend wait failures") \ 575 \ 576 product(bool, MaxFDLimit, true, \ 577 "Bump the number of file descriptors to max in solaris.") \ 578 \ 579 notproduct(bool, LogEvents, trueInDebug, \ 580 "Enable Event log") \ 581 \ 582 product(bool, BytecodeVerificationRemote, true, \ 583 "Enables the Java bytecode verifier for remote classes") \ 584 \ 585 product(bool, BytecodeVerificationLocal, false, \ 586 "Enables the Java bytecode verifier for local classes") \ 587 \ 588 develop(bool, ForceFloatExceptions, trueInDebug, \ 589 "Force exceptions on FP stack under/overflow") \ 590 \ 591 develop(bool, SoftMatchFailure, trueInProduct, \ 592 "If the DFA fails to match a node, print a message and bail out") \ 593 \ 594 develop(bool, VerifyStackAtCalls, false, \ 595 "Verify that the stack pointer is unchanged after calls") \ 596 \ 597 develop(bool, TraceJavaAssertions, false, \ 598 "Trace java language assertions") \ 599 \ 600 notproduct(bool, CheckAssertionStatusDirectives, false, \ 601 "temporary - see javaClasses.cpp") \ 602 \ 603 notproduct(bool, PrintMallocFree, false, \ 604 "Trace calls to C heap malloc/free allocation") \ 605 \ 606 notproduct(bool, PrintOopAddress, false, \ 607 "Always print the location of the oop") \ 608 \ 609 notproduct(bool, VerifyCodeCacheOften, false, \ 610 "Verify compiled-code cache often") \ 611 \ 612 develop(bool, ZapDeadCompiledLocals, false, \ 613 "Zap dead locals in compiler frames") \ 614 \ 615 notproduct(bool, ZapDeadLocalsOld, false, \ 616 "Zap dead locals (old version, zaps all frames when " \ 617 "entering the VM") \ 618 \ 619 notproduct(bool, CheckOopishValues, false, \ 620 "Warn if value contains oop ( requires ZapDeadLocals)") \ 621 \ 622 develop(bool, UseMallocOnly, false, \ 623 "use only malloc/free for allocation (no resource area/arena)") \ 624 \ 625 develop(bool, PrintMalloc, false, \ 626 "print all malloc/free calls") \ 627 \ 628 develop(bool, ZapResourceArea, trueInDebug, \ 629 "Zap freed resource/arena space with 0xABABABAB") \ 630 \ 631 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 632 "Zap freed VM handle space with 0xBCBCBCBC") \ 633 \ 634 develop(bool, ZapJNIHandleArea, trueInDebug, \ 635 "Zap freed JNI handle space with 0xFEFEFEFE") \ 636 \ 637 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 638 "Zap unused heap space with 0xBAADBABE") \ 639 \ 640 develop(bool, TraceZapUnusedHeapArea, false, \ 641 "Trace zapping of unused heap space") \ 642 \ 643 develop(bool, CheckZapUnusedHeapArea, false, \ 644 "Check zapping of unused heap space") \ 645 \ 646 develop(bool, ZapFillerObjects, trueInDebug, \ 647 "Zap filler objects with 0xDEAFBABE") \ 648 \ 649 develop(bool, PrintVMMessages, true, \ 650 "Print vm messages on console") \ 651 \ 652 product(bool, PrintGCApplicationConcurrentTime, false, \ 653 "Print the time the application has been running") \ 654 \ 655 product(bool, PrintGCApplicationStoppedTime, false, \ 656 "Print the time the application has been stopped") \ 657 \ 658 develop(bool, Verbose, false, \ 659 "Prints additional debugging information from other modes") \ 660 \ 661 develop(bool, PrintMiscellaneous, false, \ 662 "Prints uncategorized debugging information (requires +Verbose)") \ 663 \ 664 develop(bool, WizardMode, false, \ 665 "Prints much more debugging information") \ 666 \ 667 product(bool, ShowMessageBoxOnError, false, \ 668 "Keep process alive on VM fatal error") \ 669 \ 670 product_pd(bool, UseOSErrorReporting, \ 671 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 672 \ 673 product(bool, SuppressFatalErrorMessage, false, \ 674 "Do NO Fatal Error report [Avoid deadlock]") \ 675 \ 676 product(ccstrlist, OnError, "", \ 677 "Run user-defined commands on fatal error; see VMError.cpp " \ 678 "for examples") \ 679 \ 680 product(ccstrlist, OnOutOfMemoryError, "", \ 681 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 682 \ 683 manageable(bool, HeapDumpBeforeFullGC, false, \ 684 "Dump heap to file before any major stop-world GC") \ 685 \ 686 manageable(bool, HeapDumpAfterFullGC, false, \ 687 "Dump heap to file after any major stop-world GC") \ 688 \ 689 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 690 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 691 \ 692 manageable(ccstr, HeapDumpPath, NULL, \ 693 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 694 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 695 "in the working directory)") \ 696 \ 697 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 698 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 699 "when the heap usage is larger than this") \ 700 \ 701 develop(uintx, HeapDumpSegmentSize, 1*G, \ 702 "Approximate segment size when generating a segmented heap dump") \ 703 \ 704 develop(bool, BreakAtWarning, false, \ 705 "Execute breakpoint upon encountering VM warning") \ 706 \ 707 product_pd(bool, UseVectoredExceptions, \ 708 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 709 \ 710 develop(bool, TraceVMOperation, false, \ 711 "Trace vm operations") \ 712 \ 713 develop(bool, UseFakeTimers, false, \ 714 "Tells whether the VM should use system time or a fake timer") \ 715 \ 716 diagnostic(bool, LogCompilation, false, \ 717 "Log compilation activity in detail to hotspot.log or LogFile") \ 718 \ 719 product(bool, PrintCompilation, false, \ 720 "Print compilations") \ 721 \ 722 diagnostic(bool, TraceNMethodInstalls, false, \ 723 "Trace nmethod intallation") \ 724 \ 725 diagnostic(intx, ScavengeRootsInCode, 0, \ 726 "0: do not allow scavengable oops in the code cache; " \ 727 "1: allow scavenging from the code cache; " \ 728 "2: emit as many constants as the compiler can see") \ 729 \ 730 diagnostic(bool, TraceOSRBreakpoint, false, \ 731 "Trace OSR Breakpoint ") \ 732 \ 733 diagnostic(bool, TraceCompileTriggered, false, \ 734 "Trace compile triggered") \ 735 \ 736 diagnostic(bool, TraceTriggers, false, \ 737 "Trace triggers") \ 738 \ 739 product(bool, AlwaysRestoreFPU, false, \ 740 "Restore the FPU control word after every JNI call (expensive)") \ 741 \ 742 notproduct(bool, PrintCompilation2, false, \ 743 "Print additional statistics per compilation") \ 744 \ 745 diagnostic(bool, PrintAdapterHandlers, false, \ 746 "Print code generated for i2c/c2i adapters") \ 747 \ 748 diagnostic(bool, PrintAssembly, false, \ 749 "Print assembly code (using external disassembler.so)") \ 750 \ 751 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 752 "Options string passed to disassembler.so") \ 753 \ 754 diagnostic(bool, PrintNMethods, false, \ 755 "Print assembly code for nmethods when generated") \ 756 \ 757 diagnostic(bool, PrintNativeNMethods, false, \ 758 "Print assembly code for native nmethods when generated") \ 759 \ 760 develop(bool, PrintDebugInfo, false, \ 761 "Print debug information for all nmethods when generated") \ 762 \ 763 develop(bool, PrintRelocations, false, \ 764 "Print relocation information for all nmethods when generated") \ 765 \ 766 develop(bool, PrintDependencies, false, \ 767 "Print dependency information for all nmethods when generated") \ 768 \ 769 develop(bool, PrintExceptionHandlers, false, \ 770 "Print exception handler tables for all nmethods when generated") \ 771 \ 772 develop(bool, InterceptOSException, false, \ 773 "Starts debugger when an implicit OS (e.g., NULL) " \ 774 "exception happens") \ 775 \ 776 notproduct(bool, PrintCodeCache, false, \ 777 "Print the compiled_code cache when exiting") \ 778 \ 779 develop(bool, PrintCodeCache2, false, \ 780 "Print detailed info on the compiled_code cache when exiting") \ 781 \ 782 diagnostic(bool, PrintStubCode, false, \ 783 "Print generated stub code") \ 784 \ 785 product(bool, StackTraceInThrowable, true, \ 786 "Collect backtrace in throwable when exception happens") \ 787 \ 788 product(bool, OmitStackTraceInFastThrow, true, \ 789 "Omit backtraces for some 'hot' exceptions in optimized code") \ 790 \ 791 product(bool, ProfilerPrintByteCodeStatistics, false, \ 792 "Prints byte code statictics when dumping profiler output") \ 793 \ 794 product(bool, ProfilerRecordPC, false, \ 795 "Collects tick for each 16 byte interval of compiled code") \ 796 \ 797 product(bool, ProfileVM, false, \ 798 "Profiles ticks that fall within VM (either in the VM Thread " \ 799 "or VM code called through stubs)") \ 800 \ 801 product(bool, ProfileIntervals, false, \ 802 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 803 \ 804 notproduct(bool, ProfilerCheckIntervals, false, \ 805 "Collect and print info on spacing of profiler ticks") \ 806 \ 807 develop(bool, PrintJVMWarnings, false, \ 808 "Prints warnings for unimplemented JVM functions") \ 809 \ 810 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 811 "Prints warnings for stalled SpinLocks") \ 812 \ 813 develop(bool, InitializeJavaLangSystem, true, \ 814 "Initialize java.lang.System - turn off for individual " \ 815 "method debugging") \ 816 \ 817 develop(bool, InitializeJavaLangString, true, \ 818 "Initialize java.lang.String - turn off for individual " \ 819 "method debugging") \ 820 \ 821 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 822 "Initialize various error and exception classes - turn off for " \ 823 "individual method debugging") \ 824 \ 825 product(bool, RegisterFinalizersAtInit, true, \ 826 "Register finalizable objects at end of Object.<init> or " \ 827 "after allocation") \ 828 \ 829 develop(bool, RegisterReferences, true, \ 830 "Tells whether the VM should register soft/weak/final/phantom " \ 831 "references") \ 832 \ 833 develop(bool, IgnoreRewrites, false, \ 834 "Supress rewrites of bytecodes in the oopmap generator. " \ 835 "This is unsafe!") \ 836 \ 837 develop(bool, PrintCodeCacheExtension, false, \ 838 "Print extension of code cache") \ 839 \ 840 develop(bool, UsePrivilegedStack, true, \ 841 "Enable the security JVM functions") \ 842 \ 843 develop(bool, IEEEPrecision, true, \ 844 "Enables IEEE precision (for INTEL only)") \ 845 \ 846 develop(bool, ProtectionDomainVerification, true, \ 847 "Verifies protection domain before resolution in system " \ 848 "dictionary") \ 849 \ 850 product(bool, ClassUnloading, true, \ 851 "Do unloading of classes") \ 852 \ 853 diagnostic(bool, LinkWellKnownClasses, false, \ 854 "Resolve a well known class as soon as its name is seen") \ 855 \ 856 develop(bool, DisableStartThread, false, \ 857 "Disable starting of additional Java threads " \ 858 "(for debugging only)") \ 859 \ 860 develop(bool, MemProfiling, false, \ 861 "Write memory usage profiling to log file") \ 862 \ 863 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 864 "Prints the system dictionary at exit") \ 865 \ 866 diagnostic(bool, UnsyncloadClass, false, \ 867 "Unstable: VM calls loadClass unsynchronized. Custom " \ 868 "class loader must call VM synchronized for findClass " \ 869 "and defineClass.") \ 870 \ 871 product(bool, AlwaysLockClassLoader, false, \ 872 "Require the VM to acquire the class loader lock before calling " \ 873 "loadClass() even for class loaders registering " \ 874 "as parallel capable") \ 875 \ 876 product(bool, AllowParallelDefineClass, false, \ 877 "Allow parallel defineClass requests for class loaders " \ 878 "registering as parallel capable") \ 879 \ 880 product(bool, MustCallLoadClassInternal, false, \ 881 "Call loadClassInternal() rather than loadClass()") \ 882 \ 883 product_pd(bool, DontYieldALot, \ 884 "Throw away obvious excess yield calls (for SOLARIS only)") \ 885 \ 886 product_pd(bool, ConvertSleepToYield, \ 887 "Converts sleep(0) to thread yield " \ 888 "(may be off for SOLARIS to improve GUI)") \ 889 \ 890 product(bool, ConvertYieldToSleep, false, \ 891 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 892 "behavior (SOLARIS only)") \ 893 \ 894 product(bool, UseBoundThreads, true, \ 895 "Bind user level threads to kernel threads (for SOLARIS only)") \ 896 \ 897 develop(bool, UseDetachedThreads, true, \ 898 "Use detached threads that are recycled upon termination " \ 899 "(for SOLARIS only)") \ 900 \ 901 product(bool, UseLWPSynchronization, true, \ 902 "Use LWP-based instead of libthread-based synchronization " \ 903 "(SPARC only)") \ 904 \ 905 product(ccstr, SyncKnobs, NULL, \ 906 "(Unstable) Various monitor synchronization tunables") \ 907 \ 908 product(intx, EmitSync, 0, \ 909 "(Unsafe,Unstable) " \ 910 " Controls emission of inline sync fast-path code") \ 911 \ 912 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 913 \ 914 product(intx, Atomics, 0, \ 915 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 916 \ 917 product(intx, FenceInstruction, 0, \ 918 "(Unsafe,Unstable) Experimental") \ 919 \ 920 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 921 \ 922 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 923 \ 924 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 925 \ 926 product(intx, hashCode, 0, \ 927 "(Unstable) select hashCode generation algorithm" ) \ 928 \ 929 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 930 "(Unstable, Linux-specific)" \ 931 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 932 \ 933 product(bool, FilterSpuriousWakeups, true, \ 934 "Prevent spurious or premature wakeups from object.wait " \ 935 "(Solaris only)") \ 936 \ 937 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 938 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 939 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 940 \ 941 develop(bool, UsePthreads, false, \ 942 "Use pthread-based instead of libthread-based synchronization " \ 943 "(SPARC only)") \ 944 \ 945 product(bool, AdjustConcurrency, false, \ 946 "call thr_setconcurrency at thread create time to avoid " \ 947 "LWP starvation on MP systems (For Solaris Only)") \ 948 \ 949 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 950 "Should the system attempt to update the compiler file when " \ 951 "an error occurs?") \ 952 \ 953 product(bool, ReduceSignalUsage, false, \ 954 "Reduce the use of OS signals in Java and/or the VM") \ 955 \ 956 notproduct(bool, ValidateMarkSweep, false, \ 957 "Do extra validation during MarkSweep collection") \ 958 \ 959 notproduct(bool, RecordMarkSweepCompaction, false, \ 960 "Enable GC-to-GC recording and querying of compaction during " \ 961 "MarkSweep") \ 962 \ 963 develop_pd(bool, ShareVtableStubs, \ 964 "Share vtable stubs (smaller code but worse branch prediction") \ 965 \ 966 develop(bool, LoadLineNumberTables, true, \ 967 "Tells whether the class file parser loads line number tables") \ 968 \ 969 develop(bool, LoadLocalVariableTables, true, \ 970 "Tells whether the class file parser loads local variable tables")\ 971 \ 972 develop(bool, LoadLocalVariableTypeTables, true, \ 973 "Tells whether the class file parser loads local variable type tables")\ 974 \ 975 product(bool, AllowUserSignalHandlers, false, \ 976 "Do not complain if the application installs signal handlers " \ 977 "(Solaris & Linux only)") \ 978 \ 979 product(bool, UseSignalChaining, true, \ 980 "Use signal-chaining to invoke signal handlers installed " \ 981 "by the application (Solaris & Linux only)") \ 982 \ 983 product(bool, UseAltSigs, false, \ 984 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 985 "internal signals (Solaris only)") \ 986 \ 987 product(bool, UseSpinning, false, \ 988 "Use spinning in monitor inflation and before entry") \ 989 \ 990 product(bool, PreSpinYield, false, \ 991 "Yield before inner spinning loop") \ 992 \ 993 product(bool, PostSpinYield, true, \ 994 "Yield after inner spinning loop") \ 995 \ 996 product(bool, AllowJNIEnvProxy, false, \ 997 "Allow JNIEnv proxies for jdbx") \ 998 \ 999 product(bool, JNIDetachReleasesMonitors, true, \ 1000 "JNI DetachCurrentThread releases monitors owned by thread") \ 1001 \ 1002 product(bool, RestoreMXCSROnJNICalls, false, \ 1003 "Restore MXCSR when returning from JNI calls") \ 1004 \ 1005 product(bool, CheckJNICalls, false, \ 1006 "Verify all arguments to JNI calls") \ 1007 \ 1008 product(bool, UseFastJNIAccessors, true, \ 1009 "Use optimized versions of Get<Primitive>Field") \ 1010 \ 1011 product(bool, EagerXrunInit, false, \ 1012 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1013 " but not all -Xrun libraries may support the state of the VM at this time") \ 1014 \ 1015 product(bool, PreserveAllAnnotations, false, \ 1016 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1017 \ 1018 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1019 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1020 \ 1021 product(bool, LazyBootClassLoader, true, \ 1022 "Enable/disable lazy opening of boot class path entries") \ 1023 \ 1024 diagnostic(bool, UseIncDec, true, \ 1025 "Use INC, DEC instructions on x86") \ 1026 \ 1027 product(bool, UseNewLongLShift, false, \ 1028 "Use optimized bitwise shift left") \ 1029 \ 1030 product(bool, UseStoreImmI16, true, \ 1031 "Use store immediate 16-bits value instruction on x86") \ 1032 \ 1033 product(bool, UseAddressNop, false, \ 1034 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1035 \ 1036 product(bool, UseXmmLoadAndClearUpper, true, \ 1037 "Load low part of XMM register and clear upper part") \ 1038 \ 1039 product(bool, UseXmmRegToRegMoveAll, false, \ 1040 "Copy all XMM register bits when moving value between registers") \ 1041 \ 1042 product(bool, UseXmmI2D, false, \ 1043 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1044 \ 1045 product(bool, UseXmmI2F, false, \ 1046 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1047 \ 1048 product(bool, UseXMMForArrayCopy, false, \ 1049 "Use SSE2 MOVQ instruction for Arraycopy") \ 1050 \ 1051 product(bool, UseUnalignedLoadStores, false, \ 1052 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1053 \ 1054 product(intx, FieldsAllocationStyle, 1, \ 1055 "0 - type based with oops first, 1 - with oops last") \ 1056 \ 1057 product(bool, CompactFields, true, \ 1058 "Allocate nonstatic fields in gaps between previous fields") \ 1059 \ 1060 notproduct(bool, PrintCompactFieldsSavings, false, \ 1061 "Print how many words were saved with CompactFields") \ 1062 \ 1063 product(bool, UseBiasedLocking, true, \ 1064 "Enable biased locking in JVM") \ 1065 \ 1066 product(intx, BiasedLockingStartupDelay, 4000, \ 1067 "Number of milliseconds to wait before enabling biased locking") \ 1068 \ 1069 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1070 "Print statistics of biased locking in JVM") \ 1071 \ 1072 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1073 "Threshold of number of revocations per type to try to " \ 1074 "rebias all objects in the heap of that type") \ 1075 \ 1076 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1077 "Threshold of number of revocations per type to permanently " \ 1078 "revoke biases of all objects in the heap of that type") \ 1079 \ 1080 product(intx, BiasedLockingDecayTime, 25000, \ 1081 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1082 "type after previous bulk rebias") \ 1083 \ 1084 /* tracing */ \ 1085 \ 1086 notproduct(bool, TraceRuntimeCalls, false, \ 1087 "Trace run-time calls") \ 1088 \ 1089 develop(bool, TraceJNICalls, false, \ 1090 "Trace JNI calls") \ 1091 \ 1092 notproduct(bool, TraceJVMCalls, false, \ 1093 "Trace JVM calls") \ 1094 \ 1095 product(ccstr, TraceJVMTI, NULL, \ 1096 "Trace flags for JVMTI functions and events") \ 1097 \ 1098 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1099 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1100 \ 1101 /* This option can change an EMCP method into an obsolete method. */ \ 1102 /* This can affect tests that except specific methods to be EMCP. */ \ 1103 /* This option should be used with caution. */ \ 1104 product(bool, StressLdcRewrite, false, \ 1105 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1106 \ 1107 product(intx, TraceRedefineClasses, 0, \ 1108 "Trace level for JVMTI RedefineClasses") \ 1109 \ 1110 /* change to false by default sometime after Mustang */ \ 1111 product(bool, VerifyMergedCPBytecodes, true, \ 1112 "Verify bytecodes after RedefineClasses constant pool merging") \ 1113 \ 1114 develop(bool, TraceJNIHandleAllocation, false, \ 1115 "Trace allocation/deallocation of JNI handle blocks") \ 1116 \ 1117 develop(bool, TraceThreadEvents, false, \ 1118 "Trace all thread events") \ 1119 \ 1120 develop(bool, TraceBytecodes, false, \ 1121 "Trace bytecode execution") \ 1122 \ 1123 develop(bool, TraceClassInitialization, false, \ 1124 "Trace class initialization") \ 1125 \ 1126 develop(bool, TraceExceptions, false, \ 1127 "Trace exceptions") \ 1128 \ 1129 develop(bool, TraceICs, false, \ 1130 "Trace inline cache changes") \ 1131 \ 1132 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1133 "Trace method invocation counter overflow") \ 1134 \ 1135 develop(bool, TraceInlineCacheClearing, false, \ 1136 "Trace clearing of inline caches in nmethods") \ 1137 \ 1138 develop(bool, TraceDependencies, false, \ 1139 "Trace dependencies") \ 1140 \ 1141 develop(bool, VerifyDependencies, trueInDebug, \ 1142 "Exercise and verify the compilation dependency mechanism") \ 1143 \ 1144 develop(bool, TraceNewOopMapGeneration, false, \ 1145 "Trace OopMapGeneration") \ 1146 \ 1147 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1148 "Trace OopMapGeneration: print detailed cell states") \ 1149 \ 1150 develop(bool, TimeOopMap, false, \ 1151 "Time calls to GenerateOopMap::compute_map() in sum") \ 1152 \ 1153 develop(bool, TimeOopMap2, false, \ 1154 "Time calls to GenerateOopMap::compute_map() individually") \ 1155 \ 1156 develop(bool, TraceMonitorMismatch, false, \ 1157 "Trace monitor matching failures during OopMapGeneration") \ 1158 \ 1159 develop(bool, TraceOopMapRewrites, false, \ 1160 "Trace rewritting of method oops during oop map generation") \ 1161 \ 1162 develop(bool, TraceSafepoint, false, \ 1163 "Trace safepoint operations") \ 1164 \ 1165 develop(bool, TraceICBuffer, false, \ 1166 "Trace usage of IC buffer") \ 1167 \ 1168 develop(bool, TraceCompiledIC, false, \ 1169 "Trace changes of compiled IC") \ 1170 \ 1171 notproduct(bool, TraceZapDeadLocals, false, \ 1172 "Trace zapping dead locals") \ 1173 \ 1174 develop(bool, TraceStartupTime, false, \ 1175 "Trace setup time") \ 1176 \ 1177 develop(bool, TraceHPI, false, \ 1178 "Trace Host Porting Interface (HPI)") \ 1179 \ 1180 product(ccstr, HPILibPath, NULL, \ 1181 "Specify alternate path to HPI library") \ 1182 \ 1183 develop(bool, TraceProtectionDomainVerification, false, \ 1184 "Trace protection domain verifcation") \ 1185 \ 1186 develop(bool, TraceClearedExceptions, false, \ 1187 "Prints when an exception is forcibly cleared") \ 1188 \ 1189 product(bool, TraceClassResolution, false, \ 1190 "Trace all constant pool resolutions (for debugging)") \ 1191 \ 1192 product(bool, TraceBiasedLocking, false, \ 1193 "Trace biased locking in JVM") \ 1194 \ 1195 product(bool, TraceMonitorInflation, false, \ 1196 "Trace monitor inflation in JVM") \ 1197 \ 1198 /* assembler */ \ 1199 product(bool, Use486InstrsOnly, false, \ 1200 "Use 80486 Compliant instruction subset") \ 1201 \ 1202 /* gc */ \ 1203 \ 1204 product(bool, UseSerialGC, false, \ 1205 "Use the serial garbage collector") \ 1206 \ 1207 experimental(bool, UseG1GC, false, \ 1208 "Use the Garbage-First garbage collector") \ 1209 \ 1210 product(bool, UseParallelGC, false, \ 1211 "Use the Parallel Scavenge garbage collector") \ 1212 \ 1213 product(bool, UseParallelOldGC, false, \ 1214 "Use the Parallel Old garbage collector") \ 1215 \ 1216 product(bool, UseParallelOldGCCompacting, true, \ 1217 "In the Parallel Old garbage collector use parallel compaction") \ 1218 \ 1219 product(bool, UseParallelDensePrefixUpdate, true, \ 1220 "In the Parallel Old garbage collector use parallel dense" \ 1221 " prefix update") \ 1222 \ 1223 product(uintx, HeapMaximumCompactionInterval, 20, \ 1224 "How often should we maximally compact the heap (not allowing " \ 1225 "any dead space)") \ 1226 \ 1227 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1228 "The collection count for the first maximum compaction") \ 1229 \ 1230 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1231 "In the Parallel Old garbage collector maximum compaction for " \ 1232 "a system GC") \ 1233 \ 1234 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1235 "The mean used by the par compact dead wood" \ 1236 "limiter (a number between 0-100).") \ 1237 \ 1238 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1239 "The standard deviation used by the par compact dead wood" \ 1240 "limiter (a number between 0-100).") \ 1241 \ 1242 product(bool, UseParallelOldGCDensePrefix, true, \ 1243 "Use a dense prefix with the Parallel Old garbage collector") \ 1244 \ 1245 product(uintx, ParallelGCThreads, 0, \ 1246 "Number of parallel threads parallel gc will use") \ 1247 \ 1248 product(uintx, ParallelCMSThreads, 0, \ 1249 "Max number of threads CMS will use for concurrent work") \ 1250 \ 1251 develop(bool, ParallelOldGCSplitALot, false, \ 1252 "Provoke splitting (copying data from a young gen space to" \ 1253 "multiple destination spaces)") \ 1254 \ 1255 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1256 "How often to provoke splitting a young gen space") \ 1257 \ 1258 develop(bool, TraceRegionTasksQueuing, false, \ 1259 "Trace the queuing of the region tasks") \ 1260 \ 1261 product(uintx, ParallelMarkingThreads, 0, \ 1262 "Number of marking threads concurrent gc will use") \ 1263 \ 1264 product(uintx, YoungPLABSize, 4096, \ 1265 "Size of young gen promotion labs (in HeapWords)") \ 1266 \ 1267 product(uintx, OldPLABSize, 1024, \ 1268 "Size of old gen promotion labs (in HeapWords)") \ 1269 \ 1270 product(uintx, GCTaskTimeStampEntries, 200, \ 1271 "Number of time stamp entries per gc worker thread") \ 1272 \ 1273 product(bool, AlwaysTenure, false, \ 1274 "Always tenure objects in eden. (ParallelGC only)") \ 1275 \ 1276 product(bool, NeverTenure, false, \ 1277 "Never tenure objects in eden, May tenure on overflow " \ 1278 "(ParallelGC only)") \ 1279 \ 1280 product(bool, ScavengeBeforeFullGC, true, \ 1281 "Scavenge youngest generation before each full GC, " \ 1282 "used with UseParallelGC") \ 1283 \ 1284 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1285 "Allow scavenges to occur when to_space contains objects.") \ 1286 \ 1287 product(bool, UseConcMarkSweepGC, false, \ 1288 "Use Concurrent Mark-Sweep GC in the old generation") \ 1289 \ 1290 product(bool, ExplicitGCInvokesConcurrent, false, \ 1291 "A System.gc() request invokes a concurrent collection;" \ 1292 " (effective only when UseConcMarkSweepGC)") \ 1293 \ 1294 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1295 "A System.gc() request invokes a concurrent collection and " \ 1296 "also unloads classes during such a concurrent gc cycle " \ 1297 "(effective only when UseConcMarkSweepGC)") \ 1298 \ 1299 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1300 "Use Adaptive Free Lists in the CMS generation") \ 1301 \ 1302 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1303 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1304 \ 1305 develop(bool, RotateCMSCollectionTypes, false, \ 1306 "Rotate the CMS collections among concurrent and STW") \ 1307 \ 1308 product(bool, UseCMSBestFit, true, \ 1309 "Use CMS best fit allocation strategy") \ 1310 \ 1311 product(bool, UseCMSCollectionPassing, true, \ 1312 "Use passing of collection from background to foreground") \ 1313 \ 1314 product(bool, UseParNewGC, false, \ 1315 "Use parallel threads in the new generation.") \ 1316 \ 1317 product(bool, ParallelGCVerbose, false, \ 1318 "Verbose output for parallel GC.") \ 1319 \ 1320 product(intx, ParallelGCBufferWastePct, 10, \ 1321 "wasted fraction of parallel allocation buffer.") \ 1322 \ 1323 product(bool, ParallelGCRetainPLAB, true, \ 1324 "Retain parallel allocation buffers across scavenges.") \ 1325 \ 1326 product(intx, TargetPLABWastePct, 10, \ 1327 "target wasted space in last buffer as pct of overall allocation")\ 1328 \ 1329 product(uintx, PLABWeight, 75, \ 1330 "Percentage (0-100) used to weight the current sample when" \ 1331 "computing exponentially decaying average for ResizePLAB.") \ 1332 \ 1333 product(bool, ResizePLAB, true, \ 1334 "Dynamically resize (survivor space) promotion labs") \ 1335 \ 1336 product(bool, PrintPLAB, false, \ 1337 "Print (survivor space) promotion labs sizing decisions") \ 1338 \ 1339 product(intx, ParGCArrayScanChunk, 50, \ 1340 "Scan a subset and push remainder, if array is bigger than this") \ 1341 \ 1342 product(bool, ParGCUseLocalOverflow, false, \ 1343 "Instead of a global overflow list, use local overflow stacks") \ 1344 \ 1345 product(bool, ParGCTrimOverflow, true, \ 1346 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1347 \ 1348 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1349 "Whether we should simulate work queue overflow in ParNew") \ 1350 \ 1351 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1352 "An `interval' counter that determines how frequently " \ 1353 "we simulate overflow; a smaller number increases frequency") \ 1354 \ 1355 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1356 "The desired number of objects to claim from the overflow list") \ 1357 \ 1358 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1359 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1360 "parallel GC.") \ 1361 \ 1362 product(uintx, OldPLABWeight, 50, \ 1363 "Percentage (0-100) used to weight the current sample when" \ 1364 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1365 \ 1366 product(bool, ResizeOldPLAB, true, \ 1367 "Dynamically resize (old gen) promotion labs") \ 1368 \ 1369 product(bool, PrintOldPLAB, false, \ 1370 "Print (old gen) promotion labs sizing decisions") \ 1371 \ 1372 product(uintx, CMSOldPLABMin, 16, \ 1373 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1374 \ 1375 product(uintx, CMSOldPLABMax, 1024, \ 1376 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1377 \ 1378 product(uintx, CMSOldPLABNumRefills, 4, \ 1379 "Nominal number of refills of CMS gen promotion lab cache" \ 1380 " per worker per block size") \ 1381 \ 1382 product(bool, CMSOldPLABResizeQuicker, false, \ 1383 "Whether to react on-the-fly during a scavenge to a sudden" \ 1384 " change in block demand rate") \ 1385 \ 1386 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1387 "The tolerance of the phase-change detector for on-the-fly" \ 1388 " PLAB resizing during a scavenge") \ 1389 \ 1390 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1391 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1392 " during a scavenge") \ 1393 \ 1394 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1395 "The clamping of the gain in the feedback loop for on-the-fly" \ 1396 " PLAB resizing during a scavenge") \ 1397 \ 1398 product(bool, AlwaysPreTouch, false, \ 1399 "It forces all freshly committed pages to be pre-touched.") \ 1400 \ 1401 product(bool, CMSUseOldDefaults, false, \ 1402 "A flag temporarily introduced to allow reverting to some " \ 1403 "older default settings; older as of 6.0") \ 1404 \ 1405 product(intx, CMSYoungGenPerWorker, 16*M, \ 1406 "The amount of young gen chosen by default per GC worker " \ 1407 "thread available") \ 1408 \ 1409 product(bool, GCOverheadReporting, false, \ 1410 "Enables the GC overhead reporting facility") \ 1411 \ 1412 product(intx, GCOverheadReportingPeriodMS, 100, \ 1413 "Reporting period for conc GC overhead reporting, in ms ") \ 1414 \ 1415 product(bool, CMSIncrementalMode, false, \ 1416 "Whether CMS GC should operate in \"incremental\" mode") \ 1417 \ 1418 product(uintx, CMSIncrementalDutyCycle, 10, \ 1419 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1420 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1421 "value") \ 1422 \ 1423 product(bool, CMSIncrementalPacing, true, \ 1424 "Whether the CMS incremental mode duty cycle should be " \ 1425 "automatically adjusted") \ 1426 \ 1427 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1428 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1429 "enabled (a percentage, 0-100)") \ 1430 \ 1431 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1432 "Percentage (0-100) used to add conservatism when computing the " \ 1433 "duty cycle") \ 1434 \ 1435 product(uintx, CMSIncrementalOffset, 0, \ 1436 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1437 " is shifted to the right within the period between young GCs") \ 1438 \ 1439 product(uintx, CMSExpAvgFactor, 50, \ 1440 "Percentage (0-100) used to weight the current sample when" \ 1441 "computing exponential averages for CMS statistics.") \ 1442 \ 1443 product(uintx, CMS_FLSWeight, 75, \ 1444 "Percentage (0-100) used to weight the current sample when" \ 1445 "computing exponentially decating averages for CMS FLS statistics.") \ 1446 \ 1447 product(uintx, CMS_FLSPadding, 1, \ 1448 "The multiple of deviation from mean to use for buffering" \ 1449 "against volatility in free list demand.") \ 1450 \ 1451 product(uintx, FLSCoalescePolicy, 2, \ 1452 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1453 \ 1454 product(bool, FLSAlwaysCoalesceLarge, false, \ 1455 "CMS: Larger free blocks are always available for coalescing") \ 1456 \ 1457 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1458 "CMS: the smaller the percentage the greater the coalition force")\ 1459 \ 1460 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1461 "CMS: the factor by which to inflate estimated demand of small" \ 1462 " block sizes to prevent coalescing with an adjoining block") \ 1463 \ 1464 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1465 "CMS: the factor by which to inflate estimated demand of large" \ 1466 " block sizes to prevent coalescing with an adjoining block") \ 1467 \ 1468 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1469 "CMS: the factor by which to inflate estimated demand of small" \ 1470 " block sizes to prevent splitting to supply demand for smaller" \ 1471 " blocks") \ 1472 \ 1473 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1474 "CMS: the factor by which to inflate estimated demand of large" \ 1475 " block sizes to prevent splitting to supply demand for smaller" \ 1476 " blocks") \ 1477 \ 1478 product(bool, CMSExtrapolateSweep, false, \ 1479 "CMS: cushion for block demand during sweep") \ 1480 \ 1481 product(uintx, CMS_SweepWeight, 75, \ 1482 "Percentage (0-100) used to weight the current sample when " \ 1483 "computing exponentially decaying average for inter-sweep " \ 1484 "duration") \ 1485 \ 1486 product(uintx, CMS_SweepPadding, 1, \ 1487 "The multiple of deviation from mean to use for buffering " \ 1488 "against volatility in inter-sweep duration.") \ 1489 \ 1490 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1491 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1492 "duration exceeds this threhold in milliseconds") \ 1493 \ 1494 develop(bool, CMSTraceIncrementalMode, false, \ 1495 "Trace CMS incremental mode") \ 1496 \ 1497 develop(bool, CMSTraceIncrementalPacing, false, \ 1498 "Trace CMS incremental mode pacing computation") \ 1499 \ 1500 develop(bool, CMSTraceThreadState, false, \ 1501 "Trace the CMS thread state (enable the trace_state() method)") \ 1502 \ 1503 product(bool, CMSClassUnloadingEnabled, false, \ 1504 "Whether class unloading enabled when using CMS GC") \ 1505 \ 1506 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1507 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1508 " for which classes may not be unloaded") \ 1509 \ 1510 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1511 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1512 \ 1513 product(bool, UseCMSCompactAtFullCollection, true, \ 1514 "Use mark sweep compact at full collections") \ 1515 \ 1516 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1517 "Number of CMS full collection done before compaction if > 0") \ 1518 \ 1519 develop(intx, CMSDictionaryChoice, 0, \ 1520 "Use BinaryTreeDictionary as default in the CMS generation") \ 1521 \ 1522 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1523 "Replenish and indexed free list with this number of chunks") \ 1524 \ 1525 product(bool, CMSReplenishIntermediate, true, \ 1526 "Replenish all intermediate free-list caches") \ 1527 \ 1528 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1529 "When satisfying batched demand, splot blocks from the " \ 1530 "IndexedFreeList whose size is a multiple of requested size") \ 1531 \ 1532 product(bool, CMSLoopWarn, false, \ 1533 "Warn in case of excessive CMS looping") \ 1534 \ 1535 develop(bool, CMSOverflowEarlyRestoration, false, \ 1536 "Whether preserved marks should be restored early") \ 1537 \ 1538 product(uintx, CMSMarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1539 "Size of CMS marking stack") \ 1540 \ 1541 product(uintx, CMSMarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1542 "Max size of CMS marking stack") \ 1543 \ 1544 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1545 "Whether we should simulate frequent marking stack / work queue" \ 1546 " overflow") \ 1547 \ 1548 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1549 "An `interval' counter that determines how frequently" \ 1550 " we simulate overflow; a smaller number increases frequency") \ 1551 \ 1552 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1553 "(Temporary, subject to experimentation)" \ 1554 "Maximum number of abortable preclean iterations, if > 0") \ 1555 \ 1556 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1557 "(Temporary, subject to experimentation)" \ 1558 "Maximum time in abortable preclean in ms") \ 1559 \ 1560 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1561 "(Temporary, subject to experimentation)" \ 1562 "Nominal minimum work per abortable preclean iteration") \ 1563 \ 1564 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1565 "(Temporary, subject to experimentation)" \ 1566 " Time that we sleep between iterations when not given" \ 1567 " enough work per iteration") \ 1568 \ 1569 product(uintx, CMSRescanMultiple, 32, \ 1570 "Size (in cards) of CMS parallel rescan task") \ 1571 \ 1572 product(uintx, CMSConcMarkMultiple, 32, \ 1573 "Size (in cards) of CMS concurrent MT marking task") \ 1574 \ 1575 product(uintx, CMSRevisitStackSize, 1*M, \ 1576 "Size of CMS KlassKlass revisit stack") \ 1577 \ 1578 product(bool, CMSAbortSemantics, false, \ 1579 "Whether abort-on-overflow semantics is implemented") \ 1580 \ 1581 product(bool, CMSParallelRemarkEnabled, true, \ 1582 "Whether parallel remark enabled (only if ParNewGC)") \ 1583 \ 1584 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1585 "Whether parallel remark of survivor space" \ 1586 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1587 \ 1588 product(bool, CMSPLABRecordAlways, true, \ 1589 "Whether to always record survivor space PLAB bdries" \ 1590 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1591 \ 1592 product(bool, CMSConcurrentMTEnabled, true, \ 1593 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1594 \ 1595 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1596 "Whether concurrent precleaning enabled in perm gen" \ 1597 " (effective only when CMSPrecleaningEnabled is true)") \ 1598 \ 1599 product(bool, CMSPrecleaningEnabled, true, \ 1600 "Whether concurrent precleaning enabled") \ 1601 \ 1602 product(uintx, CMSPrecleanIter, 3, \ 1603 "Maximum number of precleaning iteration passes") \ 1604 \ 1605 product(uintx, CMSPrecleanNumerator, 2, \ 1606 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1607 " ratio") \ 1608 \ 1609 product(uintx, CMSPrecleanDenominator, 3, \ 1610 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1611 " ratio") \ 1612 \ 1613 product(bool, CMSPrecleanRefLists1, true, \ 1614 "Preclean ref lists during (initial) preclean phase") \ 1615 \ 1616 product(bool, CMSPrecleanRefLists2, false, \ 1617 "Preclean ref lists during abortable preclean phase") \ 1618 \ 1619 product(bool, CMSPrecleanSurvivors1, false, \ 1620 "Preclean survivors during (initial) preclean phase") \ 1621 \ 1622 product(bool, CMSPrecleanSurvivors2, true, \ 1623 "Preclean survivors during abortable preclean phase") \ 1624 \ 1625 product(uintx, CMSPrecleanThreshold, 1000, \ 1626 "Don't re-iterate if #dirty cards less than this") \ 1627 \ 1628 product(bool, CMSCleanOnEnter, true, \ 1629 "Clean-on-enter optimization for reducing number of dirty cards") \ 1630 \ 1631 product(uintx, CMSRemarkVerifyVariant, 1, \ 1632 "Choose variant (1,2) of verification following remark") \ 1633 \ 1634 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1635 "If Eden used is below this value, don't try to schedule remark") \ 1636 \ 1637 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1638 "The Eden occupancy % at which to try and schedule remark pause") \ 1639 \ 1640 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1641 "Start sampling Eden top at least before yg occupancy reaches" \ 1642 " 1/<ratio> of the size at which we plan to schedule remark") \ 1643 \ 1644 product(uintx, CMSSamplingGrain, 16*K, \ 1645 "The minimum distance between eden samples for CMS (see above)") \ 1646 \ 1647 product(bool, CMSScavengeBeforeRemark, false, \ 1648 "Attempt scavenge before the CMS remark step") \ 1649 \ 1650 develop(bool, CMSTraceSweeper, false, \ 1651 "Trace some actions of the CMS sweeper") \ 1652 \ 1653 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1654 "Don't drain below this size per parallel worker/thief") \ 1655 \ 1656 product(intx, CMSWaitDuration, 2000, \ 1657 "Time in milliseconds that CMS thread waits for young GC") \ 1658 \ 1659 product(bool, CMSYield, true, \ 1660 "Yield between steps of concurrent mark & sweep") \ 1661 \ 1662 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1663 "Bitmap operations should process at most this many bits" \ 1664 "between yields") \ 1665 \ 1666 product(bool, CMSDumpAtPromotionFailure, false, \ 1667 "Dump useful information about the state of the CMS old " \ 1668 " generation upon a promotion failure.") \ 1669 \ 1670 product(bool, CMSPrintChunksInDump, false, \ 1671 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1672 " more detailed information about the free chunks.") \ 1673 \ 1674 product(bool, CMSPrintObjectsInDump, false, \ 1675 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1676 " more detailed information about the allocated objects.") \ 1677 \ 1678 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1679 "Verify that all refs across the FLS boundary " \ 1680 " are to valid objects") \ 1681 \ 1682 diagnostic(bool, FLSVerifyLists, false, \ 1683 "Do lots of (expensive) FreeListSpace verification") \ 1684 \ 1685 diagnostic(bool, FLSVerifyIndexTable, false, \ 1686 "Do lots of (expensive) FLS index table verification") \ 1687 \ 1688 develop(bool, FLSVerifyDictionary, false, \ 1689 "Do lots of (expensive) FLS dictionary verification") \ 1690 \ 1691 develop(bool, VerifyBlockOffsetArray, false, \ 1692 "Do (expensive!) block offset array verification") \ 1693 \ 1694 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1695 "Maintain _unallocated_block in BlockOffsetArray" \ 1696 " (currently applicable only to CMS collector)") \ 1697 \ 1698 develop(bool, TraceCMSState, false, \ 1699 "Trace the state of the CMS collection") \ 1700 \ 1701 product(intx, RefDiscoveryPolicy, 0, \ 1702 "Whether reference-based(0) or referent-based(1)") \ 1703 \ 1704 product(bool, ParallelRefProcEnabled, false, \ 1705 "Enable parallel reference processing whenever possible") \ 1706 \ 1707 product(bool, ParallelRefProcBalancingEnabled, true, \ 1708 "Enable balancing of reference processing queues") \ 1709 \ 1710 product(intx, CMSTriggerRatio, 80, \ 1711 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1712 "allocated before a CMS collection cycle commences") \ 1713 \ 1714 product(intx, CMSTriggerPermRatio, 80, \ 1715 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1716 "is allocated before a CMS collection cycle commences, that " \ 1717 "also collects the perm generation") \ 1718 \ 1719 product(uintx, CMSBootstrapOccupancy, 50, \ 1720 "Percentage CMS generation occupancy at which to " \ 1721 "initiate CMS collection for bootstrapping collection stats") \ 1722 \ 1723 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1724 "Percentage CMS generation occupancy to start a CMS collection " \ 1725 "cycle. A negative value means that CMSTriggerRatio is used") \ 1726 \ 1727 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1728 "Percentage CMS perm generation occupancy to start a " \ 1729 "CMScollection cycle. A negative value means that " \ 1730 "CMSTriggerPermRatio is used") \ 1731 \ 1732 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1733 "Only use occupancy as a crierion for starting a CMS collection") \ 1734 \ 1735 product(intx, CMSIsTooFullPercentage, 98, \ 1736 "An absolute ceiling above which CMS will always consider the " \ 1737 "perm gen ripe for collection") \ 1738 \ 1739 develop(bool, CMSTestInFreeList, false, \ 1740 "Check if the coalesced range is already in the " \ 1741 "free lists as claimed") \ 1742 \ 1743 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1744 "Check that all the garbage collected was returned to the " \ 1745 "free lists.") \ 1746 \ 1747 notproduct(bool, ScavengeALot, false, \ 1748 "Force scavenge at every Nth exit from the runtime system " \ 1749 "(N=ScavengeALotInterval)") \ 1750 \ 1751 develop(bool, FullGCALot, false, \ 1752 "Force full gc at every Nth exit from the runtime system " \ 1753 "(N=FullGCALotInterval)") \ 1754 \ 1755 notproduct(bool, GCALotAtAllSafepoints, false, \ 1756 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1757 \ 1758 product(bool, HandlePromotionFailure, true, \ 1759 "The youngest generation collection does not require " \ 1760 "a guarantee of full promotion of all live objects.") \ 1761 \ 1762 product(bool, PrintPromotionFailure, false, \ 1763 "Print additional diagnostic information following " \ 1764 " promotion failure") \ 1765 \ 1766 notproduct(bool, PromotionFailureALot, false, \ 1767 "Use promotion failure handling on every youngest generation " \ 1768 "collection") \ 1769 \ 1770 develop(uintx, PromotionFailureALotCount, 1000, \ 1771 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1772 "refill attempts (ParNew) or promotion attempts " \ 1773 "(other young collectors) ") \ 1774 \ 1775 develop(uintx, PromotionFailureALotInterval, 5, \ 1776 "Total collections between promotion failures alot") \ 1777 \ 1778 develop(intx, WorkStealingSleepMillis, 1, \ 1779 "Sleep time when sleep is used for yields") \ 1780 \ 1781 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1782 "Number of yields before a sleep is done during workstealing") \ 1783 \ 1784 develop(uintx, WorkStealingHardSpins, 4096, \ 1785 "Number of iterations in a spin loop between checks on " \ 1786 "time out of hard spin") \ 1787 \ 1788 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1789 "Ratio of hard spins to calls to yield") \ 1790 \ 1791 product(uintx, PreserveMarkStackSize, 1024, \ 1792 "Size for stack used in promotion failure handling") \ 1793 \ 1794 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1795 \ 1796 product_pd(bool, ResizeTLAB, \ 1797 "Dynamically resize tlab size for threads") \ 1798 \ 1799 product(bool, ZeroTLAB, false, \ 1800 "Zero out the newly created TLAB") \ 1801 \ 1802 product(bool, FastTLABRefill, true, \ 1803 "Use fast TLAB refill code") \ 1804 \ 1805 product(bool, PrintTLAB, false, \ 1806 "Print various TLAB related information") \ 1807 \ 1808 product(bool, TLABStats, true, \ 1809 "Print various TLAB related information") \ 1810 \ 1811 product(bool, PrintRevisitStats, false, \ 1812 "Print revisit (klass and MDO) stack related information") \ 1813 \ 1814 product_pd(bool, NeverActAsServerClassMachine, \ 1815 "Never act like a server-class machine") \ 1816 \ 1817 product(bool, AlwaysActAsServerClassMachine, false, \ 1818 "Always act like a server-class machine") \ 1819 \ 1820 product_pd(uint64_t, MaxRAM, \ 1821 "Real memory size (in bytes) used to set maximum heap size") \ 1822 \ 1823 product(uintx, ErgoHeapSizeLimit, 0, \ 1824 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1825 "MaxRAM / MaxRAMFraction") \ 1826 \ 1827 product(uintx, MaxRAMFraction, 4, \ 1828 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1829 "size") \ 1830 \ 1831 product(uintx, DefaultMaxRAMFraction, 4, \ 1832 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1833 "size; deprecated: to be renamed to MaxRAMFraction") \ 1834 \ 1835 product(uintx, MinRAMFraction, 2, \ 1836 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1837 "size on systems with small physical memory size") \ 1838 \ 1839 product(uintx, InitialRAMFraction, 64, \ 1840 "Fraction (1/n) of real memory used for initial heap size") \ 1841 \ 1842 product(bool, UseAutoGCSelectPolicy, false, \ 1843 "Use automatic collection selection policy") \ 1844 \ 1845 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1846 "Automatic GC selection pause threshhold in ms") \ 1847 \ 1848 product(bool, UseAdaptiveSizePolicy, true, \ 1849 "Use adaptive generation sizing policies") \ 1850 \ 1851 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1852 "Use adaptive survivor sizing policies") \ 1853 \ 1854 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1855 "Use adaptive young-old sizing policies at minor collections") \ 1856 \ 1857 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1858 "Use adaptive young-old sizing policies at major collections") \ 1859 \ 1860 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1861 "Use statistics from System.GC for adaptive size policy") \ 1862 \ 1863 product(bool, UseAdaptiveGCBoundary, false, \ 1864 "Allow young-old boundary to move") \ 1865 \ 1866 develop(bool, TraceAdaptiveGCBoundary, false, \ 1867 "Trace young-old boundary moves") \ 1868 \ 1869 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1870 "Resize the virtual spaces of the young or old generations") \ 1871 \ 1872 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1873 "Policy for changeing generation size for throughput goals") \ 1874 \ 1875 product(uintx, AdaptiveSizePausePolicy, 0, \ 1876 "Policy for changing generation size for pause goals") \ 1877 \ 1878 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1879 "Adjust tenured generation to achive a minor pause goal") \ 1880 \ 1881 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1882 "Adjust young generation to achive a major pause goal") \ 1883 \ 1884 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1885 "Number of steps where heuristics is used before data is used") \ 1886 \ 1887 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1888 "Number of collections before the adaptive sizing is started") \ 1889 \ 1890 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1891 "Collecton interval for printing information; zero => never") \ 1892 \ 1893 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1894 "Use adaptive minimum footprint as a goal") \ 1895 \ 1896 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1897 "Weight given to exponential resizing, between 0 and 100") \ 1898 \ 1899 product(uintx, AdaptiveTimeWeight, 25, \ 1900 "Weight given to time in adaptive policy, between 0 and 100") \ 1901 \ 1902 product(uintx, PausePadding, 1, \ 1903 "How much buffer to keep for pause time") \ 1904 \ 1905 product(uintx, PromotedPadding, 3, \ 1906 "How much buffer to keep for promotion failure") \ 1907 \ 1908 product(uintx, SurvivorPadding, 3, \ 1909 "How much buffer to keep for survivor overflow") \ 1910 \ 1911 product(uintx, AdaptivePermSizeWeight, 20, \ 1912 "Weight for perm gen exponential resizing, between 0 and 100") \ 1913 \ 1914 product(uintx, PermGenPadding, 3, \ 1915 "How much buffer to keep for perm gen sizing") \ 1916 \ 1917 product(uintx, ThresholdTolerance, 10, \ 1918 "Allowed collection cost difference between generations") \ 1919 \ 1920 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1921 "If collection costs are within margin, reduce both by full " \ 1922 "delta") \ 1923 \ 1924 product(uintx, YoungGenerationSizeIncrement, 20, \ 1925 "Adaptive size percentage change in young generation") \ 1926 \ 1927 product(uintx, YoungGenerationSizeSupplement, 80, \ 1928 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1929 \ 1930 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1931 "Decay factor to YoungedGenerationSizeSupplement") \ 1932 \ 1933 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1934 "Adaptive size percentage change in tenured generation") \ 1935 \ 1936 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1937 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1938 \ 1939 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1940 "Decay factor to TenuredGenerationSizeIncrement") \ 1941 \ 1942 product(uintx, MaxGCPauseMillis, max_uintx, \ 1943 "Adaptive size policy maximum GC pause time goal in msec, " \ 1944 "or (G1 Only) the max. GC time per MMU time slice") \ 1945 \ 1946 product(intx, GCPauseIntervalMillis, 500, \ 1947 "Time slice for MMU specification") \ 1948 \ 1949 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1950 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1951 \ 1952 product(uintx, GCTimeRatio, 99, \ 1953 "Adaptive size policy application time to GC time ratio") \ 1954 \ 1955 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1956 "Adaptive size scale down factor for shrinking") \ 1957 \ 1958 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1959 "Adaptive size decays the major cost for long major intervals") \ 1960 \ 1961 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1962 "Time scale over which major costs decay") \ 1963 \ 1964 product(uintx, MinSurvivorRatio, 3, \ 1965 "Minimum ratio of young generation/survivor space size") \ 1966 \ 1967 product(uintx, InitialSurvivorRatio, 8, \ 1968 "Initial ratio of eden/survivor space size") \ 1969 \ 1970 product(uintx, BaseFootPrintEstimate, 256*M, \ 1971 "Estimate of footprint other than Java Heap") \ 1972 \ 1973 product(bool, UseGCOverheadLimit, true, \ 1974 "Use policy to limit of proportion of time spent in GC " \ 1975 "before an OutOfMemory error is thrown") \ 1976 \ 1977 product(uintx, GCTimeLimit, 98, \ 1978 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1979 "error is thrown (used with GCHeapFreeLimit)") \ 1980 \ 1981 product(uintx, GCHeapFreeLimit, 2, \ 1982 "Minimum percentage of free space after a full GC before an " \ 1983 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1984 \ 1985 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 1986 "Number of consecutive collections before gc time limit fires") \ 1987 \ 1988 product(bool, PrintAdaptiveSizePolicy, false, \ 1989 "Print information about AdaptiveSizePolicy") \ 1990 \ 1991 product(intx, PrefetchCopyIntervalInBytes, -1, \ 1992 "How far ahead to prefetch destination area (<= 0 means off)") \ 1993 \ 1994 product(intx, PrefetchScanIntervalInBytes, -1, \ 1995 "How far ahead to prefetch scan area (<= 0 means off)") \ 1996 \ 1997 product(intx, PrefetchFieldsAhead, -1, \ 1998 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 1999 \ 2000 develop(bool, UsePrefetchQueue, true, \ 2001 "Use the prefetch queue during PS promotion") \ 2002 \ 2003 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2004 "Verify system before exiting") \ 2005 \ 2006 diagnostic(bool, VerifyBeforeGC, false, \ 2007 "Verify memory system before GC") \ 2008 \ 2009 diagnostic(bool, VerifyAfterGC, false, \ 2010 "Verify memory system after GC") \ 2011 \ 2012 diagnostic(bool, VerifyDuringGC, false, \ 2013 "Verify memory system during GC (between phases)") \ 2014 \ 2015 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2016 "Enable parallel memory system verification") \ 2017 \ 2018 diagnostic(bool, VerifyRememberedSets, false, \ 2019 "Verify GC remembered sets") \ 2020 \ 2021 diagnostic(bool, VerifyObjectStartArray, true, \ 2022 "Verify GC object start array if verify before/after") \ 2023 \ 2024 product(bool, DisableExplicitGC, false, \ 2025 "Tells whether calling System.gc() does a full GC") \ 2026 \ 2027 notproduct(bool, CheckMemoryInitialization, false, \ 2028 "Checks memory initialization") \ 2029 \ 2030 product(bool, CollectGen0First, false, \ 2031 "Collect youngest generation before each full GC") \ 2032 \ 2033 diagnostic(bool, BindCMSThreadToCPU, false, \ 2034 "Bind CMS Thread to CPU if possible") \ 2035 \ 2036 diagnostic(uintx, CPUForCMSThread, 0, \ 2037 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2038 \ 2039 product(bool, BindGCTaskThreadsToCPUs, false, \ 2040 "Bind GCTaskThreads to CPUs if possible") \ 2041 \ 2042 product(bool, UseGCTaskAffinity, false, \ 2043 "Use worker affinity when asking for GCTasks") \ 2044 \ 2045 product(uintx, ProcessDistributionStride, 4, \ 2046 "Stride through processors when distributing processes") \ 2047 \ 2048 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2049 "number of times the coordinator GC thread will sleep while " \ 2050 "yielding before giving up and resuming GC") \ 2051 \ 2052 product(uintx, CMSYieldSleepCount, 0, \ 2053 "number of times a GC thread (minus the coordinator) " \ 2054 "will sleep while yielding before giving up and resuming GC") \ 2055 \ 2056 notproduct(bool, PrintFlagsFinal, false, \ 2057 "Print all command line flags after argument processing") \ 2058 \ 2059 /* gc tracing */ \ 2060 manageable(bool, PrintGC, false, \ 2061 "Print message at garbage collect") \ 2062 \ 2063 manageable(bool, PrintGCDetails, false, \ 2064 "Print more details at garbage collect") \ 2065 \ 2066 manageable(bool, PrintGCDateStamps, false, \ 2067 "Print date stamps at garbage collect") \ 2068 \ 2069 manageable(bool, PrintGCTimeStamps, false, \ 2070 "Print timestamps at garbage collect") \ 2071 \ 2072 product(bool, PrintGCTaskTimeStamps, false, \ 2073 "Print timestamps for individual gc worker thread tasks") \ 2074 \ 2075 develop(intx, ConcGCYieldTimeout, 0, \ 2076 "If non-zero, assert that GC threads yield within this # of ms.") \ 2077 \ 2078 notproduct(bool, TraceMarkSweep, false, \ 2079 "Trace mark sweep") \ 2080 \ 2081 product(bool, PrintReferenceGC, false, \ 2082 "Print times spent handling reference objects during GC " \ 2083 " (enabled only when PrintGCDetails)") \ 2084 \ 2085 develop(bool, TraceReferenceGC, false, \ 2086 "Trace handling of soft/weak/final/phantom references") \ 2087 \ 2088 develop(bool, TraceFinalizerRegistration, false, \ 2089 "Trace registration of final references") \ 2090 \ 2091 notproduct(bool, TraceScavenge, false, \ 2092 "Trace scavenge") \ 2093 \ 2094 product_rw(bool, TraceClassLoading, false, \ 2095 "Trace all classes loaded") \ 2096 \ 2097 product(bool, TraceClassLoadingPreorder, false, \ 2098 "Trace all classes loaded in order referenced (not loaded)") \ 2099 \ 2100 product_rw(bool, TraceClassUnloading, false, \ 2101 "Trace unloading of classes") \ 2102 \ 2103 product_rw(bool, TraceLoaderConstraints, false, \ 2104 "Trace loader constraints") \ 2105 \ 2106 product(bool, TraceGen0Time, false, \ 2107 "Trace accumulated time for Gen 0 collection") \ 2108 \ 2109 product(bool, TraceGen1Time, false, \ 2110 "Trace accumulated time for Gen 1 collection") \ 2111 \ 2112 product(bool, PrintTenuringDistribution, false, \ 2113 "Print tenuring age information") \ 2114 \ 2115 product_rw(bool, PrintHeapAtGC, false, \ 2116 "Print heap layout before and after each GC") \ 2117 \ 2118 product_rw(bool, PrintHeapAtGCExtended, false, \ 2119 "Prints extended information about the layout of the heap " \ 2120 "when -XX:+PrintHeapAtGC is set") \ 2121 \ 2122 product(bool, PrintHeapAtSIGBREAK, true, \ 2123 "Print heap layout in response to SIGBREAK") \ 2124 \ 2125 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2126 "Print a class histogram before any major stop-world GC") \ 2127 \ 2128 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2129 "Print a class histogram after any major stop-world GC") \ 2130 \ 2131 manageable(bool, PrintClassHistogram, false, \ 2132 "Print a histogram of class instances") \ 2133 \ 2134 develop(bool, TraceWorkGang, false, \ 2135 "Trace activities of work gangs") \ 2136 \ 2137 product(bool, TraceParallelOldGCTasks, false, \ 2138 "Trace multithreaded GC activity") \ 2139 \ 2140 develop(bool, TraceBlockOffsetTable, false, \ 2141 "Print BlockOffsetTable maps") \ 2142 \ 2143 develop(bool, TraceCardTableModRefBS, false, \ 2144 "Print CardTableModRefBS maps") \ 2145 \ 2146 develop(bool, TraceGCTaskManager, false, \ 2147 "Trace actions of the GC task manager") \ 2148 \ 2149 develop(bool, TraceGCTaskQueue, false, \ 2150 "Trace actions of the GC task queues") \ 2151 \ 2152 develop(bool, TraceGCTaskThread, false, \ 2153 "Trace actions of the GC task threads") \ 2154 \ 2155 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2156 "Print the time taken by each parallel old gc phase." \ 2157 "PrintGCDetails must also be enabled.") \ 2158 \ 2159 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2160 "Trace parallel old gc marking phase") \ 2161 \ 2162 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2163 "Trace parallel old gc summary phase") \ 2164 \ 2165 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2166 "Trace parallel old gc compaction phase") \ 2167 \ 2168 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2169 "Trace parallel old gc dense prefix computation") \ 2170 \ 2171 develop(bool, IgnoreLibthreadGPFault, false, \ 2172 "Suppress workaround for libthread GP fault") \ 2173 \ 2174 product(bool, PrintJNIGCStalls, false, \ 2175 "Print diagnostic message when GC is stalled" \ 2176 "by JNI critical section") \ 2177 \ 2178 /* JVMTI heap profiling */ \ 2179 \ 2180 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2181 "Trace JVMTI object tagging calls") \ 2182 \ 2183 diagnostic(bool, VerifyBeforeIteration, false, \ 2184 "Verify memory system before JVMTI iteration") \ 2185 \ 2186 /* compiler interface */ \ 2187 \ 2188 develop(bool, CIPrintCompilerName, false, \ 2189 "when CIPrint is active, print the name of the active compiler") \ 2190 \ 2191 develop(bool, CIPrintCompileQueue, false, \ 2192 "display the contents of the compile queue whenever a " \ 2193 "compilation is enqueued") \ 2194 \ 2195 develop(bool, CIPrintRequests, false, \ 2196 "display every request for compilation") \ 2197 \ 2198 product(bool, CITime, false, \ 2199 "collect timing information for compilation") \ 2200 \ 2201 develop(bool, CITimeEach, false, \ 2202 "display timing information after each successful compilation") \ 2203 \ 2204 develop(bool, CICountOSR, true, \ 2205 "use a separate counter when assigning ids to osr compilations") \ 2206 \ 2207 develop(bool, CICompileNatives, true, \ 2208 "compile native methods if supported by the compiler") \ 2209 \ 2210 develop_pd(bool, CICompileOSR, \ 2211 "compile on stack replacement methods if supported by the " \ 2212 "compiler") \ 2213 \ 2214 develop(bool, CIPrintMethodCodes, false, \ 2215 "print method bytecodes of the compiled code") \ 2216 \ 2217 develop(bool, CIPrintTypeFlow, false, \ 2218 "print the results of ciTypeFlow analysis") \ 2219 \ 2220 develop(bool, CITraceTypeFlow, false, \ 2221 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2222 \ 2223 develop(intx, CICloneLoopTestLimit, 100, \ 2224 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2225 \ 2226 /* temp diagnostics */ \ 2227 \ 2228 diagnostic(bool, TraceRedundantCompiles, false, \ 2229 "Have compile broker print when a request already in the queue is"\ 2230 " requested again") \ 2231 \ 2232 diagnostic(bool, InitialCompileFast, false, \ 2233 "Initial compile at CompLevel_fast_compile") \ 2234 \ 2235 diagnostic(bool, InitialCompileReallyFast, false, \ 2236 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2237 \ 2238 diagnostic(bool, FullProfileOnReInterpret, true, \ 2239 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2240 \ 2241 /* compiler */ \ 2242 \ 2243 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2244 "Number of compiler threads to run") \ 2245 \ 2246 product(intx, CompilationPolicyChoice, 0, \ 2247 "which compilation policy (0/1)") \ 2248 \ 2249 develop(bool, UseStackBanging, true, \ 2250 "use stack banging for stack overflow checks (required for " \ 2251 "proper StackOverflow handling; disable only to measure cost " \ 2252 "of stackbanging)") \ 2253 \ 2254 develop(bool, Use24BitFPMode, true, \ 2255 "Set 24-bit FPU mode on a per-compile basis ") \ 2256 \ 2257 develop(bool, Use24BitFP, true, \ 2258 "use FP instructions that produce 24-bit precise results") \ 2259 \ 2260 develop(bool, UseStrictFP, true, \ 2261 "use strict fp if modifier strictfp is set") \ 2262 \ 2263 develop(bool, GenerateSynchronizationCode, true, \ 2264 "generate locking/unlocking code for synchronized methods and " \ 2265 "monitors") \ 2266 \ 2267 develop(bool, GenerateCompilerNullChecks, true, \ 2268 "Generate explicit null checks for loads/stores/calls") \ 2269 \ 2270 develop(bool, GenerateRangeChecks, true, \ 2271 "Generate range checks for array accesses") \ 2272 \ 2273 develop_pd(bool, ImplicitNullChecks, \ 2274 "generate code for implicit null checks") \ 2275 \ 2276 product(bool, PrintSafepointStatistics, false, \ 2277 "print statistics about safepoint synchronization") \ 2278 \ 2279 product(intx, PrintSafepointStatisticsCount, 300, \ 2280 "total number of safepoint statistics collected " \ 2281 "before printing them out") \ 2282 \ 2283 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2284 "print safepoint statistics only when safepoint takes" \ 2285 " more than PrintSafepointSatisticsTimeout in millis") \ 2286 \ 2287 develop(bool, InlineAccessors, true, \ 2288 "inline accessor methods (get/set)") \ 2289 \ 2290 product(bool, Inline, true, \ 2291 "enable inlining") \ 2292 \ 2293 product(bool, ClipInlining, true, \ 2294 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2295 \ 2296 develop(bool, UseCHA, true, \ 2297 "enable CHA") \ 2298 \ 2299 product(bool, UseTypeProfile, true, \ 2300 "Check interpreter profile for historically monomorphic calls") \ 2301 \ 2302 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2303 "% of major receiver type to all profiled receivers") \ 2304 \ 2305 notproduct(bool, TimeCompiler, false, \ 2306 "time the compiler") \ 2307 \ 2308 notproduct(bool, TimeCompiler2, false, \ 2309 "detailed time the compiler (requires +TimeCompiler)") \ 2310 \ 2311 diagnostic(bool, PrintInlining, false, \ 2312 "prints inlining optimizations") \ 2313 \ 2314 diagnostic(bool, PrintIntrinsics, false, \ 2315 "prints attempted and successful inlining of intrinsics") \ 2316 \ 2317 product(bool, UseCountLeadingZerosInstruction, false, \ 2318 "Use count leading zeros instruction") \ 2319 \ 2320 product(bool, UsePopCountInstruction, false, \ 2321 "Use population count instruction") \ 2322 \ 2323 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2324 "do not expand intrinsics whose (internal) names appear here") \ 2325 \ 2326 develop(bool, StressReflectiveCode, false, \ 2327 "Use inexact types at allocations, etc., to test reflection") \ 2328 \ 2329 develop(bool, EagerInitialization, false, \ 2330 "Eagerly initialize classes if possible") \ 2331 \ 2332 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2333 "Update methodDataOops in Tier1-generated code") \ 2334 \ 2335 develop(bool, TraceMethodReplacement, false, \ 2336 "Print when methods are replaced do to recompilation") \ 2337 \ 2338 develop(bool, PrintMethodFlushing, false, \ 2339 "print the nmethods being flushed") \ 2340 \ 2341 notproduct(bool, LogMultipleMutexLocking, false, \ 2342 "log locking and unlocking of mutexes (only if multiple locks " \ 2343 "are held)") \ 2344 \ 2345 develop(bool, UseRelocIndex, false, \ 2346 "use an index to speed random access to relocations") \ 2347 \ 2348 develop(bool, StressCodeBuffers, false, \ 2349 "Exercise code buffer expansion and other rare state changes") \ 2350 \ 2351 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2352 "Generate extra debugging info for non-safepoints in nmethods") \ 2353 \ 2354 diagnostic(bool, DebugInlinedCalls, true, \ 2355 "If false, restricts profiled locations to the root method only") \ 2356 \ 2357 product(bool, PrintVMOptions, trueInDebug, \ 2358 "print VM flag settings") \ 2359 \ 2360 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2361 "Ignore unrecognized VM options") \ 2362 \ 2363 diagnostic(bool, SerializeVMOutput, true, \ 2364 "Use a mutex to serialize output to tty and hotspot.log") \ 2365 \ 2366 diagnostic(bool, DisplayVMOutput, true, \ 2367 "Display all VM output on the tty, independently of LogVMOutput") \ 2368 \ 2369 diagnostic(bool, LogVMOutput, trueInDebug, \ 2370 "Save VM output to hotspot.log, or to LogFile") \ 2371 \ 2372 diagnostic(ccstr, LogFile, NULL, \ 2373 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2374 \ 2375 product(ccstr, ErrorFile, NULL, \ 2376 "If an error occurs, save the error data to this file " \ 2377 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2378 \ 2379 product(bool, DisplayVMOutputToStderr, false, \ 2380 "If DisplayVMOutput is true, display all VM output to stderr") \ 2381 \ 2382 product(bool, DisplayVMOutputToStdout, false, \ 2383 "If DisplayVMOutput is true, display all VM output to stdout") \ 2384 \ 2385 product(bool, UseHeavyMonitors, false, \ 2386 "use heavyweight instead of lightweight Java monitors") \ 2387 \ 2388 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2389 "print histogram of the symbol table") \ 2390 \ 2391 notproduct(bool, ExitVMOnVerifyError, false, \ 2392 "standard exit from VM if bytecode verify error " \ 2393 "(only in debug mode)") \ 2394 \ 2395 notproduct(ccstr, AbortVMOnException, NULL, \ 2396 "Call fatal if this exception is thrown. Example: " \ 2397 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2398 \ 2399 develop(bool, DebugVtables, false, \ 2400 "add debugging code to vtable dispatch") \ 2401 \ 2402 develop(bool, PrintVtables, false, \ 2403 "print vtables when printing klass") \ 2404 \ 2405 notproduct(bool, PrintVtableStats, false, \ 2406 "print vtables stats at end of run") \ 2407 \ 2408 develop(bool, TraceCreateZombies, false, \ 2409 "trace creation of zombie nmethods") \ 2410 \ 2411 notproduct(bool, IgnoreLockingAssertions, false, \ 2412 "disable locking assertions (for speed)") \ 2413 \ 2414 notproduct(bool, VerifyLoopOptimizations, false, \ 2415 "verify major loop optimizations") \ 2416 \ 2417 product(bool, RangeCheckElimination, true, \ 2418 "Split loop iterations to eliminate range checks") \ 2419 \ 2420 develop_pd(bool, UncommonNullCast, \ 2421 "track occurrences of null in casts; adjust compiler tactics") \ 2422 \ 2423 develop(bool, TypeProfileCasts, true, \ 2424 "treat casts like calls for purposes of type profiling") \ 2425 \ 2426 develop(bool, MonomorphicArrayCheck, true, \ 2427 "Uncommon-trap array store checks that require full type check") \ 2428 \ 2429 develop(bool, DelayCompilationDuringStartup, true, \ 2430 "Delay invoking the compiler until main application class is " \ 2431 "loaded") \ 2432 \ 2433 develop(bool, CompileTheWorld, false, \ 2434 "Compile all methods in all classes in bootstrap class path " \ 2435 "(stress test)") \ 2436 \ 2437 develop(bool, CompileTheWorldPreloadClasses, true, \ 2438 "Preload all classes used by a class before start loading") \ 2439 \ 2440 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2441 "Compile all methods although class initializer failed") \ 2442 \ 2443 develop(bool, TraceIterativeGVN, false, \ 2444 "Print progress during Iterative Global Value Numbering") \ 2445 \ 2446 develop(bool, FillDelaySlots, true, \ 2447 "Fill delay slots (on SPARC only)") \ 2448 \ 2449 develop(bool, VerifyIterativeGVN, false, \ 2450 "Verify Def-Use modifications during sparse Iterative Global " \ 2451 "Value Numbering") \ 2452 \ 2453 notproduct(bool, TracePhaseCCP, false, \ 2454 "Print progress during Conditional Constant Propagation") \ 2455 \ 2456 develop(bool, TimeLivenessAnalysis, false, \ 2457 "Time computation of bytecode liveness analysis") \ 2458 \ 2459 develop(bool, TraceLivenessGen, false, \ 2460 "Trace the generation of liveness analysis information") \ 2461 \ 2462 notproduct(bool, TraceLivenessQuery, false, \ 2463 "Trace queries of liveness analysis information") \ 2464 \ 2465 notproduct(bool, CollectIndexSetStatistics, false, \ 2466 "Collect information about IndexSets") \ 2467 \ 2468 develop(bool, PrintDominators, false, \ 2469 "Print out dominator trees for GVN") \ 2470 \ 2471 develop(bool, UseLoopSafepoints, true, \ 2472 "Generate Safepoint nodes in every loop") \ 2473 \ 2474 notproduct(bool, TraceCISCSpill, false, \ 2475 "Trace allocators use of cisc spillable instructions") \ 2476 \ 2477 notproduct(bool, TraceSpilling, false, \ 2478 "Trace spilling") \ 2479 \ 2480 develop(bool, DeutschShiffmanExceptions, true, \ 2481 "Fast check to find exception handler for precisely typed " \ 2482 "exceptions") \ 2483 \ 2484 product(bool, SplitIfBlocks, true, \ 2485 "Clone compares and control flow through merge points to fold " \ 2486 "some branches") \ 2487 \ 2488 develop(intx, FastAllocateSizeLimit, 128*K, \ 2489 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2490 "Inline allocations larger than this in doublewords must go slow")\ 2491 \ 2492 product(bool, AggressiveOpts, false, \ 2493 "Enable aggressive optimizations - see arguments.cpp") \ 2494 \ 2495 product(bool, UseStringCache, false, \ 2496 "Enable String cache capabilities on String.java") \ 2497 \ 2498 /* statistics */ \ 2499 develop(bool, UseVTune, false, \ 2500 "enable support for Intel's VTune profiler") \ 2501 \ 2502 develop(bool, CountCompiledCalls, false, \ 2503 "counts method invocations") \ 2504 \ 2505 notproduct(bool, CountRuntimeCalls, false, \ 2506 "counts VM runtime calls") \ 2507 \ 2508 develop(bool, CountJNICalls, false, \ 2509 "counts jni method invocations") \ 2510 \ 2511 notproduct(bool, CountJVMCalls, false, \ 2512 "counts jvm method invocations") \ 2513 \ 2514 notproduct(bool, CountRemovableExceptions, false, \ 2515 "count exceptions that could be replaced by branches due to " \ 2516 "inlining") \ 2517 \ 2518 notproduct(bool, ICMissHistogram, false, \ 2519 "produce histogram of IC misses") \ 2520 \ 2521 notproduct(bool, PrintClassStatistics, false, \ 2522 "prints class statistics at end of run") \ 2523 \ 2524 notproduct(bool, PrintMethodStatistics, false, \ 2525 "prints method statistics at end of run") \ 2526 \ 2527 /* interpreter */ \ 2528 develop(bool, ClearInterpreterLocals, false, \ 2529 "Always clear local variables of interpreter activations upon " \ 2530 "entry") \ 2531 \ 2532 product_pd(bool, RewriteBytecodes, \ 2533 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2534 \ 2535 product_pd(bool, RewriteFrequentPairs, \ 2536 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2537 \ 2538 diagnostic(bool, PrintInterpreter, false, \ 2539 "Prints the generated interpreter code") \ 2540 \ 2541 product(bool, UseInterpreter, true, \ 2542 "Use interpreter for non-compiled methods") \ 2543 \ 2544 develop(bool, UseFastSignatureHandlers, true, \ 2545 "Use fast signature handlers for native calls") \ 2546 \ 2547 develop(bool, UseV8InstrsOnly, false, \ 2548 "Use SPARC-V8 Compliant instruction subset") \ 2549 \ 2550 product(bool, UseNiagaraInstrs, false, \ 2551 "Use Niagara-efficient instruction subset") \ 2552 \ 2553 develop(bool, UseCASForSwap, false, \ 2554 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2555 \ 2556 product(bool, UseLoopCounter, true, \ 2557 "Increment invocation counter on backward branch") \ 2558 \ 2559 product(bool, UseFastEmptyMethods, true, \ 2560 "Use fast method entry code for empty methods") \ 2561 \ 2562 product(bool, UseFastAccessorMethods, true, \ 2563 "Use fast method entry code for accessor methods") \ 2564 \ 2565 product_pd(bool, UseOnStackReplacement, \ 2566 "Use on stack replacement, calls runtime if invoc. counter " \ 2567 "overflows in loop") \ 2568 \ 2569 notproduct(bool, TraceOnStackReplacement, false, \ 2570 "Trace on stack replacement") \ 2571 \ 2572 develop(bool, PoisonOSREntry, true, \ 2573 "Detect abnormal calls to OSR code") \ 2574 \ 2575 product_pd(bool, PreferInterpreterNativeStubs, \ 2576 "Use always interpreter stubs for native methods invoked via " \ 2577 "interpreter") \ 2578 \ 2579 develop(bool, CountBytecodes, false, \ 2580 "Count number of bytecodes executed") \ 2581 \ 2582 develop(bool, PrintBytecodeHistogram, false, \ 2583 "Print histogram of the executed bytecodes") \ 2584 \ 2585 develop(bool, PrintBytecodePairHistogram, false, \ 2586 "Print histogram of the executed bytecode pairs") \ 2587 \ 2588 diagnostic(bool, PrintSignatureHandlers, false, \ 2589 "Print code generated for native method signature handlers") \ 2590 \ 2591 develop(bool, VerifyOops, false, \ 2592 "Do plausibility checks for oops") \ 2593 \ 2594 develop(bool, CheckUnhandledOops, false, \ 2595 "Check for unhandled oops in VM code") \ 2596 \ 2597 develop(bool, VerifyJNIFields, trueInDebug, \ 2598 "Verify jfieldIDs for instance fields") \ 2599 \ 2600 notproduct(bool, VerifyJNIEnvThread, false, \ 2601 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2602 "from JNI") \ 2603 \ 2604 develop(bool, VerifyFPU, false, \ 2605 "Verify FPU state (check for NaN's, etc.)") \ 2606 \ 2607 develop(bool, VerifyThread, false, \ 2608 "Watch the thread register for corruption (SPARC only)") \ 2609 \ 2610 develop(bool, VerifyActivationFrameSize, false, \ 2611 "Verify that activation frame didn't become smaller than its " \ 2612 "minimal size") \ 2613 \ 2614 develop(bool, TraceFrequencyInlining, false, \ 2615 "Trace frequency based inlining") \ 2616 \ 2617 notproduct(bool, TraceTypeProfile, false, \ 2618 "Trace type profile") \ 2619 \ 2620 develop_pd(bool, InlineIntrinsics, \ 2621 "Inline intrinsics that can be statically resolved") \ 2622 \ 2623 product_pd(bool, ProfileInterpreter, \ 2624 "Profile at the bytecode level during interpretation") \ 2625 \ 2626 develop_pd(bool, ProfileTraps, \ 2627 "Profile deoptimization traps at the bytecode level") \ 2628 \ 2629 product(intx, ProfileMaturityPercentage, 20, \ 2630 "number of method invocations/branches (expressed as % of " \ 2631 "CompileThreshold) before using the method's profile") \ 2632 \ 2633 develop(bool, PrintMethodData, false, \ 2634 "Print the results of +ProfileInterpreter at end of run") \ 2635 \ 2636 develop(bool, VerifyDataPointer, trueInDebug, \ 2637 "Verify the method data pointer during interpreter profiling") \ 2638 \ 2639 develop(bool, VerifyCompiledCode, false, \ 2640 "Include miscellaneous runtime verifications in nmethod code; " \ 2641 "default off because it disturbs nmethod size heuristics") \ 2642 \ 2643 \ 2644 /* compilation */ \ 2645 product(bool, UseCompiler, true, \ 2646 "use compilation") \ 2647 \ 2648 develop(bool, TraceCompilationPolicy, false, \ 2649 "Trace compilation policy") \ 2650 \ 2651 develop(bool, TimeCompilationPolicy, false, \ 2652 "Time the compilation policy") \ 2653 \ 2654 product(bool, UseCounterDecay, true, \ 2655 "adjust recompilation counters") \ 2656 \ 2657 develop(intx, CounterHalfLifeTime, 30, \ 2658 "half-life time of invocation counters (in secs)") \ 2659 \ 2660 develop(intx, CounterDecayMinIntervalLength, 500, \ 2661 "Min. ms. between invocation of CounterDecay") \ 2662 \ 2663 product(bool, AlwaysCompileLoopMethods, false, \ 2664 "when using recompilation, never interpret methods " \ 2665 "containing loops") \ 2666 \ 2667 product(bool, DontCompileHugeMethods, true, \ 2668 "don't compile methods > HugeMethodLimit") \ 2669 \ 2670 /* Bytecode escape analysis estimation. */ \ 2671 product(bool, EstimateArgEscape, true, \ 2672 "Analyze bytecodes to estimate escape state of arguments") \ 2673 \ 2674 product(intx, BCEATraceLevel, 0, \ 2675 "How much tracing to do of bytecode escape analysis estimates") \ 2676 \ 2677 product(intx, MaxBCEAEstimateLevel, 5, \ 2678 "Maximum number of nested calls that are analyzed by BC EA.") \ 2679 \ 2680 product(intx, MaxBCEAEstimateSize, 150, \ 2681 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2682 \ 2683 product(intx, AllocatePrefetchStyle, 1, \ 2684 "0 = no prefetch, " \ 2685 "1 = prefetch instructions for each allocation, " \ 2686 "2 = use TLAB watermark to gate allocation prefetch") \ 2687 \ 2688 product(intx, AllocatePrefetchDistance, -1, \ 2689 "Distance to prefetch ahead of allocation pointer") \ 2690 \ 2691 product(intx, AllocatePrefetchLines, 1, \ 2692 "Number of lines to prefetch ahead of allocation pointer") \ 2693 \ 2694 product(intx, AllocatePrefetchStepSize, 16, \ 2695 "Step size in bytes of sequential prefetch instructions") \ 2696 \ 2697 product(intx, AllocatePrefetchInstr, 0, \ 2698 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2699 \ 2700 product(intx, ReadPrefetchInstr, 0, \ 2701 "Prefetch instruction to prefetch ahead") \ 2702 \ 2703 /* deoptimization */ \ 2704 develop(bool, TraceDeoptimization, false, \ 2705 "Trace deoptimization") \ 2706 \ 2707 develop(bool, DebugDeoptimization, false, \ 2708 "Tracing various information while debugging deoptimization") \ 2709 \ 2710 product(intx, SelfDestructTimer, 0, \ 2711 "Will cause VM to terminate after a given time (in minutes) " \ 2712 "(0 means off)") \ 2713 \ 2714 product(intx, MaxJavaStackTraceDepth, 1024, \ 2715 "Max. no. of lines in the stack trace for Java exceptions " \ 2716 "(0 means all)") \ 2717 \ 2718 develop(intx, GuaranteedSafepointInterval, 1000, \ 2719 "Guarantee a safepoint (at least) every so many milliseconds " \ 2720 "(0 means none)") \ 2721 \ 2722 product(intx, SafepointTimeoutDelay, 10000, \ 2723 "Delay in milliseconds for option SafepointTimeout") \ 2724 \ 2725 product(intx, NmethodSweepFraction, 4, \ 2726 "Number of invocations of sweeper to cover all nmethods") \ 2727 \ 2728 notproduct(intx, MemProfilingInterval, 500, \ 2729 "Time between each invocation of the MemProfiler") \ 2730 \ 2731 develop(intx, MallocCatchPtr, -1, \ 2732 "Hit breakpoint when mallocing/freeing this pointer") \ 2733 \ 2734 notproduct(intx, AssertRepeat, 1, \ 2735 "number of times to evaluate expression in assert " \ 2736 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2737 \ 2738 notproduct(ccstrlist, SuppressErrorAt, "", \ 2739 "List of assertions (file:line) to muzzle") \ 2740 \ 2741 notproduct(uintx, HandleAllocationLimit, 1024, \ 2742 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2743 "is used") \ 2744 \ 2745 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2746 "Threshold for total handle allocation when " \ 2747 "+TraceHandleAllocation is used") \ 2748 \ 2749 develop(intx, StackPrintLimit, 100, \ 2750 "number of stack frames to print in VM-level stack dump") \ 2751 \ 2752 notproduct(intx, MaxElementPrintSize, 256, \ 2753 "maximum number of elements to print") \ 2754 \ 2755 notproduct(intx, MaxSubklassPrintSize, 4, \ 2756 "maximum number of subklasses to print when printing klass") \ 2757 \ 2758 develop(intx, MaxInlineLevel, 9, \ 2759 "maximum number of nested calls that are inlined") \ 2760 \ 2761 develop(intx, MaxRecursiveInlineLevel, 1, \ 2762 "maximum number of nested recursive calls that are inlined") \ 2763 \ 2764 product_pd(intx, InlineSmallCode, \ 2765 "Only inline already compiled methods if their code size is " \ 2766 "less than this") \ 2767 \ 2768 product(intx, MaxInlineSize, 35, \ 2769 "maximum bytecode size of a method to be inlined") \ 2770 \ 2771 product_pd(intx, FreqInlineSize, \ 2772 "maximum bytecode size of a frequent method to be inlined") \ 2773 \ 2774 develop(intx, MaxTrivialSize, 6, \ 2775 "maximum bytecode size of a trivial method to be inlined") \ 2776 \ 2777 develop(intx, MinInliningThreshold, 250, \ 2778 "min. invocation count a method needs to have to be inlined") \ 2779 \ 2780 develop(intx, AlignEntryCode, 4, \ 2781 "aligns entry code to specified value (in bytes)") \ 2782 \ 2783 develop(intx, MethodHistogramCutoff, 100, \ 2784 "cutoff value for method invoc. histogram (+CountCalls)") \ 2785 \ 2786 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2787 "# of interpreted methods to show in profile") \ 2788 \ 2789 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2790 "# of compiled methods to show in profile") \ 2791 \ 2792 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2793 "# of stub methods to show in profile") \ 2794 \ 2795 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2796 "# of runtime stub nodes to show in profile") \ 2797 \ 2798 product(intx, ProfileIntervalsTicks, 100, \ 2799 "# of ticks between printing of interval profile " \ 2800 "(+ProfileIntervals)") \ 2801 \ 2802 notproduct(intx, ScavengeALotInterval, 1, \ 2803 "Interval between which scavenge will occur with +ScavengeALot") \ 2804 \ 2805 notproduct(intx, FullGCALotInterval, 1, \ 2806 "Interval between which full gc will occur with +FullGCALot") \ 2807 \ 2808 notproduct(intx, FullGCALotStart, 0, \ 2809 "For which invocation to start FullGCAlot") \ 2810 \ 2811 notproduct(intx, FullGCALotDummies, 32*K, \ 2812 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2813 "to move") \ 2814 \ 2815 develop(intx, DontYieldALotInterval, 10, \ 2816 "Interval between which yields will be dropped (milliseconds)") \ 2817 \ 2818 develop(intx, MinSleepInterval, 1, \ 2819 "Minimum sleep() interval (milliseconds) when " \ 2820 "ConvertSleepToYield is off (used for SOLARIS)") \ 2821 \ 2822 product(intx, EventLogLength, 2000, \ 2823 "maximum nof events in event log") \ 2824 \ 2825 develop(intx, ProfilerPCTickThreshold, 15, \ 2826 "Number of ticks in a PC buckets to be a hotspot") \ 2827 \ 2828 notproduct(intx, DeoptimizeALotInterval, 5, \ 2829 "Number of exits until DeoptimizeALot kicks in") \ 2830 \ 2831 notproduct(intx, ZombieALotInterval, 5, \ 2832 "Number of exits until ZombieALot kicks in") \ 2833 \ 2834 develop(bool, StressNonEntrant, false, \ 2835 "Mark nmethods non-entrant at registration") \ 2836 \ 2837 diagnostic(intx, MallocVerifyInterval, 0, \ 2838 "if non-zero, verify C heap after every N calls to " \ 2839 "malloc/realloc/free") \ 2840 \ 2841 diagnostic(intx, MallocVerifyStart, 0, \ 2842 "if non-zero, start verifying C heap after Nth call to " \ 2843 "malloc/realloc/free") \ 2844 \ 2845 product(intx, TypeProfileWidth, 2, \ 2846 "number of receiver types to record in call/cast profile") \ 2847 \ 2848 develop(intx, BciProfileWidth, 2, \ 2849 "number of return bci's to record in ret profile") \ 2850 \ 2851 product(intx, PerMethodRecompilationCutoff, 400, \ 2852 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2853 \ 2854 product(intx, PerBytecodeRecompilationCutoff, 100, \ 2855 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2856 \ 2857 product(intx, PerMethodTrapLimit, 100, \ 2858 "Limit on traps (of one kind) in a method (includes inlines)") \ 2859 \ 2860 product(intx, PerBytecodeTrapLimit, 4, \ 2861 "Limit on traps (of one kind) at a particular BCI") \ 2862 \ 2863 develop(intx, FreqCountInvocations, 1, \ 2864 "Scaling factor for branch frequencies (deprecated)") \ 2865 \ 2866 develop(intx, InlineFrequencyRatio, 20, \ 2867 "Ratio of call site execution to caller method invocation") \ 2868 \ 2869 develop_pd(intx, InlineFrequencyCount, \ 2870 "Count of call site execution necessary to trigger frequent " \ 2871 "inlining") \ 2872 \ 2873 develop(intx, InlineThrowCount, 50, \ 2874 "Force inlining of interpreted methods that throw this often") \ 2875 \ 2876 develop(intx, InlineThrowMaxSize, 200, \ 2877 "Force inlining of throwing methods smaller than this") \ 2878 \ 2879 product(intx, AliasLevel, 3, \ 2880 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2881 "2 for class split, 3 for unique instances") \ 2882 \ 2883 develop(bool, VerifyAliases, false, \ 2884 "perform extra checks on the results of alias analysis") \ 2885 \ 2886 develop(intx, ProfilerNodeSize, 1024, \ 2887 "Size in K to allocate for the Profile Nodes of each thread") \ 2888 \ 2889 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2890 "Number of times to spin wait on a v8 atomic operation lock") \ 2891 \ 2892 product(intx, ReadSpinIterations, 100, \ 2893 "Number of read attempts before a yield (spin inner loop)") \ 2894 \ 2895 product_pd(intx, PreInflateSpin, \ 2896 "Number of times to spin wait before inflation") \ 2897 \ 2898 product(intx, PreBlockSpin, 10, \ 2899 "Number of times to spin in an inflated lock before going to " \ 2900 "an OS lock") \ 2901 \ 2902 /* gc parameters */ \ 2903 product(uintx, InitialHeapSize, 0, \ 2904 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2905 \ 2906 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2907 "Maximum heap size (in bytes)") \ 2908 \ 2909 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2910 "Initial tenured generation size (in bytes)") \ 2911 \ 2912 product(uintx, NewSize, ScaleForWordSize(4*M), \ 2913 "Initial new generation size (in bytes)") \ 2914 \ 2915 product(uintx, MaxNewSize, max_uintx, \ 2916 "Maximum new generation size (in bytes), max_uintx means set " \ 2917 "ergonomically") \ 2918 \ 2919 product(uintx, PretenureSizeThreshold, 0, \ 2920 "Maximum size in bytes of objects allocated in DefNew " \ 2921 "generation; zero means no maximum") \ 2922 \ 2923 product(uintx, TLABSize, 0, \ 2924 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2925 \ 2926 product(uintx, MinTLABSize, 2*K, \ 2927 "Minimum allowed TLAB size (in bytes)") \ 2928 \ 2929 product(uintx, TLABAllocationWeight, 35, \ 2930 "Allocation averaging weight") \ 2931 \ 2932 product(uintx, TLABWasteTargetPercent, 1, \ 2933 "Percentage of Eden that can be wasted") \ 2934 \ 2935 product(uintx, TLABRefillWasteFraction, 64, \ 2936 "Max TLAB waste at a refill (internal fragmentation)") \ 2937 \ 2938 product(uintx, TLABWasteIncrement, 4, \ 2939 "Increment allowed waste at slow allocation") \ 2940 \ 2941 product(intx, SurvivorRatio, 8, \ 2942 "Ratio of eden/survivor space size") \ 2943 \ 2944 product(intx, NewRatio, 2, \ 2945 "Ratio of new/old generation sizes") \ 2946 \ 2947 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2948 "Max percent of eden objects that will be live at scavenge") \ 2949 \ 2950 product_pd(uintx, NewSizeThreadIncrease, \ 2951 "Additional size added to desired new generation size per " \ 2952 "non-daemon thread (in bytes)") \ 2953 \ 2954 product_pd(uintx, PermSize, \ 2955 "Initial size of permanent generation (in bytes)") \ 2956 \ 2957 product_pd(uintx, MaxPermSize, \ 2958 "Maximum size of permanent generation (in bytes)") \ 2959 \ 2960 product(uintx, MinHeapFreeRatio, 40, \ 2961 "Min percentage of heap free after GC to avoid expansion") \ 2962 \ 2963 product(uintx, MaxHeapFreeRatio, 70, \ 2964 "Max percentage of heap free after GC to avoid shrinking") \ 2965 \ 2966 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2967 "Number of milliseconds per MB of free space in the heap") \ 2968 \ 2969 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2970 "Min change in heap space due to GC (in bytes)") \ 2971 \ 2972 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 2973 "Min expansion of permanent heap (in bytes)") \ 2974 \ 2975 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 2976 "Max expansion of permanent heap without full GC (in bytes)") \ 2977 \ 2978 product(intx, QueuedAllocationWarningCount, 0, \ 2979 "Number of times an allocation that queues behind a GC " \ 2980 "will retry before printing a warning") \ 2981 \ 2982 diagnostic(uintx, VerifyGCStartAt, 0, \ 2983 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 2984 \ 2985 diagnostic(intx, VerifyGCLevel, 0, \ 2986 "Generation level at which to start +VerifyBefore/AfterGC") \ 2987 \ 2988 develop(uintx, ExitAfterGCNum, 0, \ 2989 "If non-zero, exit after this GC.") \ 2990 \ 2991 product(intx, MaxTenuringThreshold, 15, \ 2992 "Maximum value for tenuring threshold") \ 2993 \ 2994 product(intx, InitialTenuringThreshold, 7, \ 2995 "Initial value for tenuring threshold") \ 2996 \ 2997 product(intx, TargetSurvivorRatio, 50, \ 2998 "Desired percentage of survivor space used after scavenge") \ 2999 \ 3000 product(uintx, MarkSweepDeadRatio, 5, \ 3001 "Percentage (0-100) of the old gen allowed as dead wood." \ 3002 "Serial mark sweep treats this as both the min and max value." \ 3003 "CMS uses this value only if it falls back to mark sweep." \ 3004 "Par compact uses a variable scale based on the density of the" \ 3005 "generation and treats this as the max value when the heap is" \ 3006 "either completely full or completely empty. Par compact also" \ 3007 "has a smaller default value; see arguments.cpp.") \ 3008 \ 3009 product(uintx, PermMarkSweepDeadRatio, 20, \ 3010 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3011 "See MarkSweepDeadRatio for collector-specific comments.") \ 3012 \ 3013 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3014 "How often should we fully compact the heap (ignoring the dead " \ 3015 "space parameters)") \ 3016 \ 3017 product(intx, PrintCMSStatistics, 0, \ 3018 "Statistics for CMS") \ 3019 \ 3020 product(bool, PrintCMSInitiationStatistics, false, \ 3021 "Statistics for initiating a CMS collection") \ 3022 \ 3023 product(intx, PrintFLSStatistics, 0, \ 3024 "Statistics for CMS' FreeListSpace") \ 3025 \ 3026 product(intx, PrintFLSCensus, 0, \ 3027 "Census for CMS' FreeListSpace") \ 3028 \ 3029 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3030 "Delay in ms between expansion and allocation") \ 3031 \ 3032 product(intx, DeferThrSuspendLoopCount, 4000, \ 3033 "(Unstable) Number of times to iterate in safepoint loop " \ 3034 " before blocking VM threads ") \ 3035 \ 3036 product(intx, DeferPollingPageLoopCount, -1, \ 3037 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3038 "before changing safepoint polling page to RO ") \ 3039 \ 3040 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3041 \ 3042 product(bool, UseDepthFirstScavengeOrder, true, \ 3043 "true: the scavenge order will be depth-first, " \ 3044 "false: the scavenge order will be breadth-first") \ 3045 \ 3046 product(bool, PSChunkLargeArrays, true, \ 3047 "true: process large arrays in chunks") \ 3048 \ 3049 product(uintx, GCDrainStackTargetSize, 64, \ 3050 "how many entries we'll try to leave on the stack during " \ 3051 "parallel GC") \ 3052 \ 3053 /* stack parameters */ \ 3054 product_pd(intx, StackYellowPages, \ 3055 "Number of yellow zone (recoverable overflows) pages") \ 3056 \ 3057 product_pd(intx, StackRedPages, \ 3058 "Number of red zone (unrecoverable overflows) pages") \ 3059 \ 3060 product_pd(intx, StackShadowPages, \ 3061 "Number of shadow zone (for overflow checking) pages" \ 3062 " this should exceed the depth of the VM and native call stack") \ 3063 \ 3064 product_pd(intx, ThreadStackSize, \ 3065 "Thread Stack Size (in Kbytes)") \ 3066 \ 3067 product_pd(intx, VMThreadStackSize, \ 3068 "Non-Java Thread Stack Size (in Kbytes)") \ 3069 \ 3070 product_pd(intx, CompilerThreadStackSize, \ 3071 "Compiler Thread Stack Size (in Kbytes)") \ 3072 \ 3073 develop_pd(uintx, JVMInvokeMethodSlack, \ 3074 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3075 \ 3076 product(uintx, ThreadSafetyMargin, 50*M, \ 3077 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3078 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3079 "disable this feature") \ 3080 \ 3081 /* code cache parameters */ \ 3082 develop(uintx, CodeCacheSegmentSize, 64, \ 3083 "Code cache segment size (in bytes) - smallest unit of " \ 3084 "allocation") \ 3085 \ 3086 develop_pd(intx, CodeEntryAlignment, \ 3087 "Code entry alignment for generated code (in bytes)") \ 3088 \ 3089 product_pd(uintx, InitialCodeCacheSize, \ 3090 "Initial code cache size (in bytes)") \ 3091 \ 3092 product_pd(uintx, ReservedCodeCacheSize, \ 3093 "Reserved code cache size (in bytes) - maximum code cache size") \ 3094 \ 3095 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3096 "When less than X space left, we stop compiling.") \ 3097 \ 3098 product_pd(uintx, CodeCacheExpansionSize, \ 3099 "Code cache expansion size (in bytes)") \ 3100 \ 3101 develop_pd(uintx, CodeCacheMinBlockLength, \ 3102 "Minimum number of segments in a code cache block.") \ 3103 \ 3104 notproduct(bool, ExitOnFullCodeCache, false, \ 3105 "Exit the VM if we fill the code cache.") \ 3106 \ 3107 /* interpreter debugging */ \ 3108 develop(intx, BinarySwitchThreshold, 5, \ 3109 "Minimal number of lookupswitch entries for rewriting to binary " \ 3110 "switch") \ 3111 \ 3112 develop(intx, StopInterpreterAt, 0, \ 3113 "Stops interpreter execution at specified bytecode number") \ 3114 \ 3115 develop(intx, TraceBytecodesAt, 0, \ 3116 "Traces bytecodes starting with specified bytecode number") \ 3117 \ 3118 /* compiler interface */ \ 3119 develop(intx, CIStart, 0, \ 3120 "the id of the first compilation to permit") \ 3121 \ 3122 develop(intx, CIStop, -1, \ 3123 "the id of the last compilation to permit") \ 3124 \ 3125 develop(intx, CIStartOSR, 0, \ 3126 "the id of the first osr compilation to permit " \ 3127 "(CICountOSR must be on)") \ 3128 \ 3129 develop(intx, CIStopOSR, -1, \ 3130 "the id of the last osr compilation to permit " \ 3131 "(CICountOSR must be on)") \ 3132 \ 3133 develop(intx, CIBreakAtOSR, -1, \ 3134 "id of osr compilation to break at") \ 3135 \ 3136 develop(intx, CIBreakAt, -1, \ 3137 "id of compilation to break at") \ 3138 \ 3139 product(ccstrlist, CompileOnly, "", \ 3140 "List of methods (pkg/class.name) to restrict compilation to") \ 3141 \ 3142 product(ccstr, CompileCommandFile, NULL, \ 3143 "Read compiler commands from this file [.hotspot_compiler]") \ 3144 \ 3145 product(ccstrlist, CompileCommand, "", \ 3146 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3147 \ 3148 product(bool, CICompilerCountPerCPU, false, \ 3149 "1 compiler thread for log(N CPUs)") \ 3150 \ 3151 develop(intx, CIFireOOMAt, -1, \ 3152 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3153 "(non-negative value throws OOM after this many CI accesses " \ 3154 "in each compile)") \ 3155 \ 3156 develop(intx, CIFireOOMAtDelay, -1, \ 3157 "Wait for this many CI accesses to occur in all compiles before " \ 3158 "beginning to throw OutOfMemoryErrors in each compile") \ 3159 \ 3160 notproduct(bool, CIObjectFactoryVerify, false, \ 3161 "enable potentially expensive verification in ciObjectFactory") \ 3162 \ 3163 /* Priorities */ \ 3164 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3165 \ 3166 product(intx, ThreadPriorityPolicy, 0, \ 3167 "0 : Normal. "\ 3168 " VM chooses priorities that are appropriate for normal "\ 3169 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3170 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3171 " map to lower native priority values. On Windows applications"\ 3172 " are allowed to use higher native priorities. However, with "\ 3173 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3174 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3175 " interfere with system threads. On Linux thread priorities "\ 3176 " are ignored because the OS does not support static priority "\ 3177 " in SCHED_OTHER scheduling class which is the only choice for"\ 3178 " non-root, non-realtime applications. "\ 3179 "1 : Aggressive. "\ 3180 " Java thread priorities map over to the entire range of "\ 3181 " native thread priorities. Higher Java thread priorities map "\ 3182 " to higher native thread priorities. This policy should be "\ 3183 " used with care, as sometimes it can cause performance "\ 3184 " degradation in the application and/or the entire system. On "\ 3185 " Linux this policy requires root privilege.") \ 3186 \ 3187 product(bool, ThreadPriorityVerbose, false, \ 3188 "print priority changes") \ 3189 \ 3190 product(intx, DefaultThreadPriority, -1, \ 3191 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3192 \ 3193 product(intx, CompilerThreadPriority, -1, \ 3194 "what priority should compiler threads run at (-1 means no change)") \ 3195 \ 3196 product(intx, VMThreadPriority, -1, \ 3197 "what priority should VM threads run at (-1 means no change)") \ 3198 \ 3199 product(bool, CompilerThreadHintNoPreempt, true, \ 3200 "(Solaris only) Give compiler threads an extra quanta") \ 3201 \ 3202 product(bool, VMThreadHintNoPreempt, false, \ 3203 "(Solaris only) Give VM thread an extra quanta") \ 3204 \ 3205 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3206 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3207 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3208 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3209 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3210 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3211 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3212 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3213 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3214 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3215 \ 3216 /* compiler debugging */ \ 3217 notproduct(intx, CompileTheWorldStartAt, 1, \ 3218 "First class to consider when using +CompileTheWorld") \ 3219 \ 3220 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3221 "Last class to consider when using +CompileTheWorld") \ 3222 \ 3223 develop(intx, NewCodeParameter, 0, \ 3224 "Testing Only: Create a dedicated integer parameter before " \ 3225 "putback") \ 3226 \ 3227 /* new oopmap storage allocation */ \ 3228 develop(intx, MinOopMapAllocation, 8, \ 3229 "Minimum number of OopMap entries in an OopMapSet") \ 3230 \ 3231 /* Background Compilation */ \ 3232 develop(intx, LongCompileThreshold, 50, \ 3233 "Used with +TraceLongCompiles") \ 3234 \ 3235 product(intx, StarvationMonitorInterval, 200, \ 3236 "Pause between each check in ms") \ 3237 \ 3238 /* recompilation */ \ 3239 product_pd(intx, CompileThreshold, \ 3240 "number of interpreted method invocations before (re-)compiling") \ 3241 \ 3242 product_pd(intx, BackEdgeThreshold, \ 3243 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3244 \ 3245 product(intx, Tier1BytecodeLimit, 10, \ 3246 "Must have at least this many bytecodes before tier1" \ 3247 "invocation counters are used") \ 3248 \ 3249 product_pd(intx, Tier2CompileThreshold, \ 3250 "threshold at which a tier 2 compilation is invoked") \ 3251 \ 3252 product_pd(intx, Tier2BackEdgeThreshold, \ 3253 "Back edge threshold at which a tier 2 compilation is invoked") \ 3254 \ 3255 product_pd(intx, Tier3CompileThreshold, \ 3256 "threshold at which a tier 3 compilation is invoked") \ 3257 \ 3258 product_pd(intx, Tier3BackEdgeThreshold, \ 3259 "Back edge threshold at which a tier 3 compilation is invoked") \ 3260 \ 3261 product_pd(intx, Tier4CompileThreshold, \ 3262 "threshold at which a tier 4 compilation is invoked") \ 3263 \ 3264 product_pd(intx, Tier4BackEdgeThreshold, \ 3265 "Back edge threshold at which a tier 4 compilation is invoked") \ 3266 \ 3267 product_pd(bool, TieredCompilation, \ 3268 "Enable two-tier compilation") \ 3269 \ 3270 product(bool, StressTieredRuntime, false, \ 3271 "Alternate client and server compiler on compile requests") \ 3272 \ 3273 product_pd(intx, OnStackReplacePercentage, \ 3274 "NON_TIERED number of method invocations/branches (expressed as %"\ 3275 "of CompileThreshold) before (re-)compiling OSR code") \ 3276 \ 3277 product(intx, InterpreterProfilePercentage, 33, \ 3278 "NON_TIERED number of method invocations/branches (expressed as %"\ 3279 "of CompileThreshold) before profiling in the interpreter") \ 3280 \ 3281 develop(intx, MaxRecompilationSearchLength, 10, \ 3282 "max. # frames to inspect searching for recompilee") \ 3283 \ 3284 develop(intx, MaxInterpretedSearchLength, 3, \ 3285 "max. # interp. frames to skip when searching for recompilee") \ 3286 \ 3287 develop(intx, DesiredMethodLimit, 8000, \ 3288 "desired max. method size (in bytecodes) after inlining") \ 3289 \ 3290 develop(intx, HugeMethodLimit, 8000, \ 3291 "don't compile methods larger than this if " \ 3292 "+DontCompileHugeMethods") \ 3293 \ 3294 /* New JDK 1.4 reflection implementation */ \ 3295 \ 3296 develop(bool, UseNewReflection, true, \ 3297 "Temporary flag for transition to reflection based on dynamic " \ 3298 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3299 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3300 "changes were needed") \ 3301 \ 3302 develop(bool, VerifyReflectionBytecodes, false, \ 3303 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3304 "in situations like that described in 4486457 or for " \ 3305 "constructors generated for serialization, so can not be enabled "\ 3306 "in product.") \ 3307 \ 3308 product(bool, ReflectionWrapResolutionErrors, true, \ 3309 "Temporary flag for transition to AbstractMethodError wrapped " \ 3310 "in InvocationTargetException. See 6531596") \ 3311 \ 3312 \ 3313 develop(intx, FastSuperclassLimit, 8, \ 3314 "Depth of hardwired instanceof accelerator array") \ 3315 \ 3316 /* Properties for Java libraries */ \ 3317 \ 3318 product(intx, MaxDirectMemorySize, -1, \ 3319 "Maximum total size of NIO direct-buffer allocations") \ 3320 \ 3321 /* temporary developer defined flags */ \ 3322 \ 3323 diagnostic(bool, UseNewCode, false, \ 3324 "Testing Only: Use the new version while testing") \ 3325 \ 3326 diagnostic(bool, UseNewCode2, false, \ 3327 "Testing Only: Use the new version while testing") \ 3328 \ 3329 diagnostic(bool, UseNewCode3, false, \ 3330 "Testing Only: Use the new version while testing") \ 3331 \ 3332 /* flags for performance data collection */ \ 3333 \ 3334 product(bool, UsePerfData, true, \ 3335 "Flag to disable jvmstat instrumentation for performance testing" \ 3336 "and problem isolation purposes.") \ 3337 \ 3338 product(bool, PerfDataSaveToFile, false, \ 3339 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3340 \ 3341 product(ccstr, PerfDataSaveFile, NULL, \ 3342 "Save PerfData memory to the specified absolute pathname," \ 3343 "%p in the file name if present will be replaced by pid") \ 3344 \ 3345 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3346 "Data sampling interval in milliseconds") \ 3347 \ 3348 develop(bool, PerfTraceDataCreation, false, \ 3349 "Trace creation of Performance Data Entries") \ 3350 \ 3351 develop(bool, PerfTraceMemOps, false, \ 3352 "Trace PerfMemory create/attach/detach calls") \ 3353 \ 3354 product(bool, PerfDisableSharedMem, false, \ 3355 "Store performance data in standard memory") \ 3356 \ 3357 product(intx, PerfDataMemorySize, 32*K, \ 3358 "Size of performance data memory region. Will be rounded " \ 3359 "up to a multiple of the native os page size.") \ 3360 \ 3361 product(intx, PerfMaxStringConstLength, 1024, \ 3362 "Maximum PerfStringConstant string length before truncation") \ 3363 \ 3364 product(bool, PerfAllowAtExitRegistration, false, \ 3365 "Allow registration of atexit() methods") \ 3366 \ 3367 product(bool, PerfBypassFileSystemCheck, false, \ 3368 "Bypass Win32 file system criteria checks (Windows Only)") \ 3369 \ 3370 product(intx, UnguardOnExecutionViolation, 0, \ 3371 "Unguard page and retry on no-execute fault (Win32 only)" \ 3372 "0=off, 1=conservative, 2=aggressive") \ 3373 \ 3374 /* Serviceability Support */ \ 3375 \ 3376 product(bool, ManagementServer, false, \ 3377 "Create JMX Management Server") \ 3378 \ 3379 product(bool, DisableAttachMechanism, false, \ 3380 "Disable mechanism that allows tools to attach to this VM") \ 3381 \ 3382 product(bool, StartAttachListener, false, \ 3383 "Always start Attach Listener at VM startup") \ 3384 \ 3385 manageable(bool, PrintConcurrentLocks, false, \ 3386 "Print java.util.concurrent locks in thread dump") \ 3387 \ 3388 /* Shared spaces */ \ 3389 \ 3390 product(bool, UseSharedSpaces, true, \ 3391 "Use shared spaces in the permanent generation") \ 3392 \ 3393 product(bool, RequireSharedSpaces, false, \ 3394 "Require shared spaces in the permanent generation") \ 3395 \ 3396 product(bool, ForceSharedSpaces, false, \ 3397 "Require shared spaces in the permanent generation") \ 3398 \ 3399 product(bool, DumpSharedSpaces, false, \ 3400 "Special mode: JVM reads a class list, loads classes, builds " \ 3401 "shared spaces, and dumps the shared spaces to a file to be " \ 3402 "used in future JVM runs.") \ 3403 \ 3404 product(bool, PrintSharedSpaces, false, \ 3405 "Print usage of shared spaces") \ 3406 \ 3407 product(uintx, SharedDummyBlockSize, 512*M, \ 3408 "Size of dummy block used to shift heap addresses (in bytes)") \ 3409 \ 3410 product(uintx, SharedReadWriteSize, 12*M, \ 3411 "Size of read-write space in permanent generation (in bytes)") \ 3412 \ 3413 product(uintx, SharedReadOnlySize, 10*M, \ 3414 "Size of read-only space in permanent generation (in bytes)") \ 3415 \ 3416 product(uintx, SharedMiscDataSize, 4*M, \ 3417 "Size of the shared data area adjacent to the heap (in bytes)") \ 3418 \ 3419 product(uintx, SharedMiscCodeSize, 4*M, \ 3420 "Size of the shared code area adjacent to the heap (in bytes)") \ 3421 \ 3422 diagnostic(bool, SharedOptimizeColdStart, true, \ 3423 "At dump time, order shared objects to achieve better " \ 3424 "cold startup time.") \ 3425 \ 3426 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3427 "Reordering policy for SharedOptimizeColdStart " \ 3428 "0=favor classload-time locality, 1=balanced, " \ 3429 "2=favor runtime locality") \ 3430 \ 3431 diagnostic(bool, SharedSkipVerify, false, \ 3432 "Skip assert() and verify() which page-in unwanted shared " \ 3433 "objects. ") \ 3434 \ 3435 product(bool, AnonymousClasses, false, \ 3436 "support sun.misc.Unsafe.defineAnonymousClass") \ 3437 \ 3438 experimental(bool, EnableMethodHandles, false, \ 3439 "support method handles (true by default under JSR 292)") \ 3440 \ 3441 diagnostic(intx, MethodHandlePushLimit, 3, \ 3442 "number of additional stack slots a method handle may push") \ 3443 \ 3444 develop(bool, TraceMethodHandles, false, \ 3445 "trace internal method handle operations") \ 3446 \ 3447 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3448 "perform extra checks when constructing method handles") \ 3449 \ 3450 diagnostic(bool, OptimizeMethodHandles, true, \ 3451 "when constructing method handles, try to improve them") \ 3452 \ 3453 experimental(bool, EnableInvokeDynamic, false, \ 3454 "recognize the invokedynamic instruction") \ 3455 \ 3456 develop(bool, TraceInvokeDynamic, false, \ 3457 "trace internal invoke dynamic operations") \ 3458 \ 3459 product(bool, TaggedStackInterpreter, false, \ 3460 "Insert tags in interpreter execution stack for oopmap generaion")\ 3461 \ 3462 diagnostic(bool, PauseAtStartup, false, \ 3463 "Causes the VM to pause at startup time and wait for the pause " \ 3464 "file to be removed (default: ./vm.paused.<pid>)") \ 3465 \ 3466 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3467 "The file to create and for whose removal to await when pausing " \ 3468 "at startup. (default: ./vm.paused.<pid>)") \ 3469 \ 3470 product(bool, ExtendedDTraceProbes, false, \ 3471 "Enable performance-impacting dtrace probes") \ 3472 \ 3473 product(bool, DTraceMethodProbes, false, \ 3474 "Enable dtrace probes for method-entry and method-exit") \ 3475 \ 3476 product(bool, DTraceAllocProbes, false, \ 3477 "Enable dtrace probes for object allocation") \ 3478 \ 3479 product(bool, DTraceMonitorProbes, false, \ 3480 "Enable dtrace probes for monitor events") \ 3481 \ 3482 product(bool, RelaxAccessControlCheck, false, \ 3483 "Relax the access control checks in the verifier") \ 3484 \ 3485 diagnostic(bool, PrintDTraceDOF, false, \ 3486 "Print the DTrace DOF passed to the system for JSDT probes") \ 3487 \ 3488 product(bool, UseVMInterruptibleIO, false, \ 3489 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3490 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3491 " of this flag is true for JDK 6 and earliers") 3492 3493 3494/* 3495 * Macros for factoring of globals 3496 */ 3497 3498// Interface macros 3499#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3500#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3501#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3502#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3503#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3504#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3505#ifdef PRODUCT 3506#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3507#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3508#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3509#else 3510#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3511#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3512#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3513#endif 3514// Special LP64 flags, product only needed for now. 3515#ifdef _LP64 3516#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3517#else 3518#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3519#endif // _LP64 3520 3521// Implementation macros 3522#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3523#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3524#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3525#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3526#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3527#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3528#ifdef PRODUCT 3529#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3530#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3531#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3532#else 3533#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3534#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3535#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3536#endif 3537#ifdef _LP64 3538#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3539#else 3540#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3541#endif // _LP64 3542 3543RUNTIME_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) 3544 3545RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3546