globals.hpp revision 1010:354d3184f6b2
1/* 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#if !defined(COMPILER1) && !defined(COMPILER2) 26define_pd_global(bool, BackgroundCompilation, false); 27define_pd_global(bool, UseTLAB, false); 28define_pd_global(bool, CICompileOSR, false); 29define_pd_global(bool, UseTypeProfile, false); 30define_pd_global(bool, UseOnStackReplacement, false); 31define_pd_global(bool, InlineIntrinsics, false); 32define_pd_global(bool, PreferInterpreterNativeStubs, true); 33define_pd_global(bool, ProfileInterpreter, false); 34define_pd_global(bool, ProfileTraps, false); 35define_pd_global(bool, TieredCompilation, false); 36 37define_pd_global(intx, CompileThreshold, 0); 38define_pd_global(intx, Tier2CompileThreshold, 0); 39define_pd_global(intx, Tier3CompileThreshold, 0); 40define_pd_global(intx, Tier4CompileThreshold, 0); 41 42define_pd_global(intx, BackEdgeThreshold, 0); 43define_pd_global(intx, Tier2BackEdgeThreshold, 0); 44define_pd_global(intx, Tier3BackEdgeThreshold, 0); 45define_pd_global(intx, Tier4BackEdgeThreshold, 0); 46 47define_pd_global(intx, OnStackReplacePercentage, 0); 48define_pd_global(bool, ResizeTLAB, false); 49define_pd_global(intx, FreqInlineSize, 0); 50define_pd_global(intx, NewSizeThreadIncrease, 4*K); 51define_pd_global(intx, NewRatio, 4); 52define_pd_global(intx, InlineClassNatives, true); 53define_pd_global(intx, InlineUnsafeOps, true); 54define_pd_global(intx, InitialCodeCacheSize, 160*K); 55define_pd_global(intx, ReservedCodeCacheSize, 32*M); 56define_pd_global(intx, CodeCacheExpansionSize, 32*K); 57define_pd_global(intx, CodeCacheMinBlockLength, 1); 58define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 59define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 60define_pd_global(bool, NeverActAsServerClassMachine, true); 61define_pd_global(uintx, DefaultMaxRAM, 1*G); 62#define CI_COMPILER_COUNT 0 63#else 64 65#ifdef COMPILER2 66#define CI_COMPILER_COUNT 2 67#else 68#define CI_COMPILER_COUNT 1 69#endif // COMPILER2 70 71#endif // no compilers 72 73 74// string type aliases used only in this file 75typedef const char* ccstr; 76typedef const char* ccstrlist; // represents string arguments which accumulate 77 78enum FlagValueOrigin { 79 DEFAULT = 0, 80 COMMAND_LINE = 1, 81 ENVIRON_VAR = 2, 82 CONFIG_FILE = 3, 83 MANAGEMENT = 4, 84 ERGONOMIC = 5, 85 ATTACH_ON_DEMAND = 6, 86 INTERNAL = 99 87}; 88 89struct Flag { 90 const char *type; 91 const char *name; 92 void* addr; 93 const char *kind; 94 FlagValueOrigin origin; 95 96 // points to all Flags static array 97 static Flag *flags; 98 99 // number of flags 100 static size_t numFlags; 101 102 static Flag* find_flag(char* name, size_t length); 103 104 bool is_bool() const { return strcmp(type, "bool") == 0; } 105 bool get_bool() const { return *((bool*) addr); } 106 void set_bool(bool value) { *((bool*) addr) = value; } 107 108 bool is_intx() const { return strcmp(type, "intx") == 0; } 109 intx get_intx() const { return *((intx*) addr); } 110 void set_intx(intx value) { *((intx*) addr) = value; } 111 112 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 113 uintx get_uintx() const { return *((uintx*) addr); } 114 void set_uintx(uintx value) { *((uintx*) addr) = value; } 115 116 bool is_double() const { return strcmp(type, "double") == 0; } 117 double get_double() const { return *((double*) addr); } 118 void set_double(double value) { *((double*) addr) = value; } 119 120 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 121 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 122 ccstr get_ccstr() const { return *((ccstr*) addr); } 123 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 124 125 bool is_unlocker() const; 126 bool is_unlocked() const; 127 bool is_writeable() const; 128 bool is_external() const; 129 130 void print_on(outputStream* st); 131 void print_as_flag(outputStream* st); 132}; 133 134// debug flags control various aspects of the VM and are global accessible 135 136// use FlagSetting to temporarily change some debug flag 137// e.g. FlagSetting fs(DebugThisAndThat, true); 138// restored to previous value upon leaving scope 139class FlagSetting { 140 bool val; 141 bool* flag; 142 public: 143 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 144 ~FlagSetting() { *flag = val; } 145}; 146 147 148class CounterSetting { 149 intx* counter; 150 public: 151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 152 ~CounterSetting() { (*counter)--; } 153}; 154 155 156class IntFlagSetting { 157 intx val; 158 intx* flag; 159 public: 160 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 161 ~IntFlagSetting() { *flag = val; } 162}; 163 164 165class DoubleFlagSetting { 166 double val; 167 double* flag; 168 public: 169 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 170 ~DoubleFlagSetting() { *flag = val; } 171}; 172 173 174class CommandLineFlags { 175 public: 176 static bool boolAt(char* name, size_t len, bool* value); 177 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 178 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 179 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 180 181 static bool intxAt(char* name, size_t len, intx* value); 182 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 183 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 184 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 185 186 static bool uintxAt(char* name, size_t len, uintx* value); 187 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 188 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 189 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 190 191 static bool doubleAt(char* name, size_t len, double* value); 192 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 193 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 194 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 195 196 static bool ccstrAt(char* name, size_t len, ccstr* value); 197 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 198 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 199 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 200 201 // Returns false if name is not a command line flag. 202 static bool wasSetOnCmdline(const char* name, bool* value); 203 static void printSetFlags(); 204 205 static void printFlags() PRODUCT_RETURN; 206 207 static void verify() PRODUCT_RETURN; 208}; 209 210// use this for flags that are true by default in the debug version but 211// false in the optimized version, and vice versa 212#ifdef ASSERT 213#define trueInDebug true 214#define falseInDebug false 215#else 216#define trueInDebug false 217#define falseInDebug true 218#endif 219 220// use this for flags that are true per default in the product build 221// but false in development builds, and vice versa 222#ifdef PRODUCT 223#define trueInProduct true 224#define falseInProduct false 225#else 226#define trueInProduct false 227#define falseInProduct true 228#endif 229 230// use this for flags that are true per default in the tiered build 231// but false in non-tiered builds, and vice versa 232#ifdef TIERED 233#define trueInTiered true 234#define falseInTiered false 235#else 236#define trueInTiered false 237#define falseInTiered true 238#endif 239 240// develop flags are settable / visible only during development and are constant in the PRODUCT version 241// product flags are always settable / visible 242// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 243 244// A flag must be declared with one of the following types: 245// bool, intx, uintx, ccstr. 246// The type "ccstr" is an alias for "const char*" and is used 247// only in this file, because the macrology requires single-token type names. 248 249// Note: Diagnostic options not meant for VM tuning or for product modes. 250// They are to be used for VM quality assurance or field diagnosis 251// of VM bugs. They are hidden so that users will not be encouraged to 252// try them as if they were VM ordinary execution options. However, they 253// are available in the product version of the VM. Under instruction 254// from support engineers, VM customers can turn them on to collect 255// diagnostic information about VM problems. To use a VM diagnostic 256// option, you must first specify +UnlockDiagnosticVMOptions. 257// (This master switch also affects the behavior of -Xprintflags.) 258// 259// experimental flags are in support of features that are not 260// part of the officially supported product, but are available 261// for experimenting with. They could, for example, be performance 262// features that may not have undergone full or rigorous QA, but which may 263// help performance in some cases and released for experimentation 264// by the community of users and developers. This flag also allows one to 265// be able to build a fully supported product that nonetheless also 266// ships with some unsupported, lightly tested, experimental features. 267// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 268// UnlockExperimentalVMOptions flag, which allows the control and 269// modification of the experimental flags. 270// 271// manageable flags are writeable external product flags. 272// They are dynamically writeable through the JDK management interface 273// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 274// These flags are external exported interface (see CCC). The list of 275// manageable flags can be queried programmatically through the management 276// interface. 277// 278// A flag can be made as "manageable" only if 279// - the flag is defined in a CCC as an external exported interface. 280// - the VM implementation supports dynamic setting of the flag. 281// This implies that the VM must *always* query the flag variable 282// and not reuse state related to the flag state at any given time. 283// - you want the flag to be queried programmatically by the customers. 284// 285// product_rw flags are writeable internal product flags. 286// They are like "manageable" flags but for internal/private use. 287// The list of product_rw flags are internal/private flags which 288// may be changed/removed in a future release. It can be set 289// through the management interface to get/set value 290// when the name of flag is supplied. 291// 292// A flag can be made as "product_rw" only if 293// - the VM implementation supports dynamic setting of the flag. 294// This implies that the VM must *always* query the flag variable 295// and not reuse state related to the flag state at any given time. 296// 297// Note that when there is a need to support develop flags to be writeable, 298// it can be done in the same way as product_rw. 299 300#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 301 \ 302 lp64_product(bool, UseCompressedOops, false, \ 303 "Use 32-bit object references in 64-bit VM. " \ 304 "lp64_product means flag is always constant in 32 bit VM") \ 305 \ 306 notproduct(bool, CheckCompressedOops, true, \ 307 "generate checks in encoding/decoding code in debug VM") \ 308 \ 309 product_pd(uintx, HeapBaseMinAddress, \ 310 "OS specific low limit for heap base address") \ 311 \ 312 diagnostic(bool, PrintCompressedOopsMode, false, \ 313 "Print compressed oops base address and encoding mode") \ 314 \ 315 /* UseMembar is theoretically a temp flag used for memory barrier \ 316 * removal testing. It was supposed to be removed before FCS but has \ 317 * been re-added (see 6401008) */ \ 318 product(bool, UseMembar, false, \ 319 "(Unstable) Issues membars on thread state transitions") \ 320 \ 321 product(bool, PrintCommandLineFlags, false, \ 322 "Prints flags that appeared on the command line") \ 323 \ 324 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 325 "Enable normal processing of flags relating to field diagnostics")\ 326 \ 327 experimental(bool, UnlockExperimentalVMOptions, false, \ 328 "Enable normal processing of flags relating to experimental features")\ 329 \ 330 product(bool, JavaMonitorsInStackTrace, true, \ 331 "Print info. about Java monitor locks when the stacks are dumped")\ 332 \ 333 product_pd(bool, UseLargePages, \ 334 "Use large page memory") \ 335 \ 336 product_pd(bool, UseLargePagesIndividualAllocation, \ 337 "Allocate large pages individually for better affinity") \ 338 \ 339 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 340 "Fail large pages individual allocation") \ 341 \ 342 develop(bool, TracePageSizes, false, \ 343 "Trace page size selection and usage.") \ 344 \ 345 product(bool, UseNUMA, false, \ 346 "Use NUMA if available") \ 347 \ 348 product(bool, ForceNUMA, false, \ 349 "Force NUMA optimizations on single-node/UMA systems") \ 350 \ 351 product(intx, NUMAChunkResizeWeight, 20, \ 352 "Percentage (0-100) used to weight the current sample when " \ 353 "computing exponentially decaying average for " \ 354 "AdaptiveNUMAChunkSizing") \ 355 \ 356 product(intx, NUMASpaceResizeRate, 1*G, \ 357 "Do not reallocate more that this amount per collection") \ 358 \ 359 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 360 "Enable adaptive chunk sizing for NUMA") \ 361 \ 362 product(bool, NUMAStats, false, \ 363 "Print NUMA stats in detailed heap information") \ 364 \ 365 product(intx, NUMAPageScanRate, 256, \ 366 "Maximum number of pages to include in the page scan procedure") \ 367 \ 368 product_pd(bool, NeedsDeoptSuspend, \ 369 "True for register window machines (sparc/ia64)") \ 370 \ 371 product(intx, UseSSE, 99, \ 372 "Highest supported SSE instructions set on x86/x64") \ 373 \ 374 product(uintx, LargePageSizeInBytes, 0, \ 375 "Large page size (0 to let VM choose the page size") \ 376 \ 377 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 378 "Use large pages if max heap is at least this big") \ 379 \ 380 product(bool, ForceTimeHighResolution, false, \ 381 "Using high time resolution(For Win32 only)") \ 382 \ 383 develop(bool, TraceItables, false, \ 384 "Trace initialization and use of itables") \ 385 \ 386 develop(bool, TracePcPatching, false, \ 387 "Trace usage of frame::patch_pc") \ 388 \ 389 develop(bool, TraceJumps, false, \ 390 "Trace assembly jumps in thread ring buffer") \ 391 \ 392 develop(bool, TraceRelocator, false, \ 393 "Trace the bytecode relocator") \ 394 \ 395 develop(bool, TraceLongCompiles, false, \ 396 "Print out every time compilation is longer than " \ 397 "a given threashold") \ 398 \ 399 develop(bool, SafepointALot, false, \ 400 "Generates a lot of safepoints. Works with " \ 401 "GuaranteedSafepointInterval") \ 402 \ 403 product_pd(bool, BackgroundCompilation, \ 404 "A thread requesting compilation is not blocked during " \ 405 "compilation") \ 406 \ 407 product(bool, PrintVMQWaitTime, false, \ 408 "Prints out the waiting time in VM operation queue") \ 409 \ 410 develop(bool, BailoutToInterpreterForThrows, false, \ 411 "Compiled methods which throws/catches exceptions will be " \ 412 "deopt and intp.") \ 413 \ 414 develop(bool, NoYieldsInMicrolock, false, \ 415 "Disable yields in microlock") \ 416 \ 417 develop(bool, TraceOopMapGeneration, false, \ 418 "Shows oopmap generation") \ 419 \ 420 product(bool, MethodFlushing, true, \ 421 "Reclamation of zombie and not-entrant methods") \ 422 \ 423 develop(bool, VerifyStack, false, \ 424 "Verify stack of each thread when it is entering a runtime call") \ 425 \ 426 develop(bool, ForceUnreachable, false, \ 427 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 428 \ 429 notproduct(bool, StressDerivedPointers, false, \ 430 "Force scavenge when a derived pointers is detected on stack " \ 431 "after rtm call") \ 432 \ 433 develop(bool, TraceDerivedPointers, false, \ 434 "Trace traversal of derived pointers on stack") \ 435 \ 436 notproduct(bool, TraceCodeBlobStacks, false, \ 437 "Trace stack-walk of codeblobs") \ 438 \ 439 product(bool, PrintJNIResolving, false, \ 440 "Used to implement -v:jni") \ 441 \ 442 notproduct(bool, PrintRewrites, false, \ 443 "Print methods that are being rewritten") \ 444 \ 445 product(bool, UseInlineCaches, true, \ 446 "Use Inline Caches for virtual calls ") \ 447 \ 448 develop(bool, InlineArrayCopy, true, \ 449 "inline arraycopy native that is known to be part of " \ 450 "base library DLL") \ 451 \ 452 develop(bool, InlineObjectHash, true, \ 453 "inline Object::hashCode() native that is known to be part " \ 454 "of base library DLL") \ 455 \ 456 develop(bool, InlineObjectCopy, true, \ 457 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 458 \ 459 develop(bool, InlineNatives, true, \ 460 "inline natives that are known to be part of base library DLL") \ 461 \ 462 develop(bool, InlineMathNatives, true, \ 463 "inline SinD, CosD, etc.") \ 464 \ 465 develop(bool, InlineClassNatives, true, \ 466 "inline Class.isInstance, etc") \ 467 \ 468 develop(bool, InlineAtomicLong, true, \ 469 "inline sun.misc.AtomicLong") \ 470 \ 471 develop(bool, InlineThreadNatives, true, \ 472 "inline Thread.currentThread, etc") \ 473 \ 474 develop(bool, InlineReflectionGetCallerClass, true, \ 475 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 476 "of base library DLL") \ 477 \ 478 develop(bool, InlineUnsafeOps, true, \ 479 "inline memory ops (native methods) from sun.misc.Unsafe") \ 480 \ 481 develop(bool, ConvertCmpD2CmpF, true, \ 482 "Convert cmpD to cmpF when one input is constant in float range") \ 483 \ 484 develop(bool, ConvertFloat2IntClipping, true, \ 485 "Convert float2int clipping idiom to integer clipping") \ 486 \ 487 develop(bool, SpecialStringCompareTo, true, \ 488 "special version of string compareTo") \ 489 \ 490 develop(bool, SpecialStringIndexOf, true, \ 491 "special version of string indexOf") \ 492 \ 493 develop(bool, SpecialStringEquals, true, \ 494 "special version of string equals") \ 495 \ 496 develop(bool, SpecialArraysEquals, true, \ 497 "special version of Arrays.equals(char[],char[])") \ 498 \ 499 product(bool, UseSSE42Intrinsics, false, \ 500 "SSE4.2 versions of intrinsics") \ 501 \ 502 develop(bool, TraceCallFixup, false, \ 503 "traces all call fixups") \ 504 \ 505 develop(bool, DeoptimizeALot, false, \ 506 "deoptimize at every exit from the runtime system") \ 507 \ 508 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 509 "a comma separated list of bcis to deoptimize at") \ 510 \ 511 product(bool, DeoptimizeRandom, false, \ 512 "deoptimize random frames on random exit from the runtime system")\ 513 \ 514 notproduct(bool, ZombieALot, false, \ 515 "creates zombies (non-entrant) at exit from the runt. system") \ 516 \ 517 notproduct(bool, WalkStackALot, false, \ 518 "trace stack (no print) at every exit from the runtime system") \ 519 \ 520 develop(bool, Debugging, false, \ 521 "set when executing debug methods in debug.ccp " \ 522 "(to prevent triggering assertions)") \ 523 \ 524 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 525 "Enable strict checks that safepoints cannot happen for threads " \ 526 "that used No_Safepoint_Verifier") \ 527 \ 528 notproduct(bool, VerifyLastFrame, false, \ 529 "Verify oops on last frame on entry to VM") \ 530 \ 531 develop(bool, TraceHandleAllocation, false, \ 532 "Prints out warnings when suspicious many handles are allocated") \ 533 \ 534 product(bool, UseCompilerSafepoints, true, \ 535 "Stop at safepoints in compiled code") \ 536 \ 537 product(bool, UseSplitVerifier, true, \ 538 "use split verifier with StackMapTable attributes") \ 539 \ 540 product(bool, FailOverToOldVerifier, true, \ 541 "fail over to old verifier when split verifier fails") \ 542 \ 543 develop(bool, ShowSafepointMsgs, false, \ 544 "Show msg. about safepoint synch.") \ 545 \ 546 product(bool, SafepointTimeout, false, \ 547 "Time out and warn or fail after SafepointTimeoutDelay " \ 548 "milliseconds if failed to reach safepoint") \ 549 \ 550 develop(bool, DieOnSafepointTimeout, false, \ 551 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 552 \ 553 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 554 /* typically, at most a few retries are needed */ \ 555 product(intx, SuspendRetryCount, 50, \ 556 "Maximum retry count for an external suspend request") \ 557 \ 558 product(intx, SuspendRetryDelay, 5, \ 559 "Milliseconds to delay per retry (* current_retry_count)") \ 560 \ 561 product(bool, AssertOnSuspendWaitFailure, false, \ 562 "Assert/Guarantee on external suspend wait failure") \ 563 \ 564 product(bool, TraceSuspendWaitFailures, false, \ 565 "Trace external suspend wait failures") \ 566 \ 567 product(bool, MaxFDLimit, true, \ 568 "Bump the number of file descriptors to max in solaris.") \ 569 \ 570 notproduct(bool, LogEvents, trueInDebug, \ 571 "Enable Event log") \ 572 \ 573 product(bool, BytecodeVerificationRemote, true, \ 574 "Enables the Java bytecode verifier for remote classes") \ 575 \ 576 product(bool, BytecodeVerificationLocal, false, \ 577 "Enables the Java bytecode verifier for local classes") \ 578 \ 579 develop(bool, ForceFloatExceptions, trueInDebug, \ 580 "Force exceptions on FP stack under/overflow") \ 581 \ 582 develop(bool, SoftMatchFailure, trueInProduct, \ 583 "If the DFA fails to match a node, print a message and bail out") \ 584 \ 585 develop(bool, VerifyStackAtCalls, false, \ 586 "Verify that the stack pointer is unchanged after calls") \ 587 \ 588 develop(bool, TraceJavaAssertions, false, \ 589 "Trace java language assertions") \ 590 \ 591 notproduct(bool, CheckAssertionStatusDirectives, false, \ 592 "temporary - see javaClasses.cpp") \ 593 \ 594 notproduct(bool, PrintMallocFree, false, \ 595 "Trace calls to C heap malloc/free allocation") \ 596 \ 597 notproduct(bool, PrintOopAddress, false, \ 598 "Always print the location of the oop") \ 599 \ 600 notproduct(bool, VerifyCodeCacheOften, false, \ 601 "Verify compiled-code cache often") \ 602 \ 603 develop(bool, ZapDeadCompiledLocals, false, \ 604 "Zap dead locals in compiler frames") \ 605 \ 606 notproduct(bool, ZapDeadLocalsOld, false, \ 607 "Zap dead locals (old version, zaps all frames when " \ 608 "entering the VM") \ 609 \ 610 notproduct(bool, CheckOopishValues, false, \ 611 "Warn if value contains oop ( requires ZapDeadLocals)") \ 612 \ 613 develop(bool, UseMallocOnly, false, \ 614 "use only malloc/free for allocation (no resource area/arena)") \ 615 \ 616 develop(bool, PrintMalloc, false, \ 617 "print all malloc/free calls") \ 618 \ 619 develop(bool, ZapResourceArea, trueInDebug, \ 620 "Zap freed resource/arena space with 0xABABABAB") \ 621 \ 622 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 623 "Zap freed VM handle space with 0xBCBCBCBC") \ 624 \ 625 develop(bool, ZapJNIHandleArea, trueInDebug, \ 626 "Zap freed JNI handle space with 0xFEFEFEFE") \ 627 \ 628 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 629 "Zap unused heap space with 0xBAADBABE") \ 630 \ 631 develop(bool, TraceZapUnusedHeapArea, false, \ 632 "Trace zapping of unused heap space") \ 633 \ 634 develop(bool, CheckZapUnusedHeapArea, false, \ 635 "Check zapping of unused heap space") \ 636 \ 637 develop(bool, ZapFillerObjects, trueInDebug, \ 638 "Zap filler objects with 0xDEAFBABE") \ 639 \ 640 develop(bool, PrintVMMessages, true, \ 641 "Print vm messages on console") \ 642 \ 643 product(bool, PrintGCApplicationConcurrentTime, false, \ 644 "Print the time the application has been running") \ 645 \ 646 product(bool, PrintGCApplicationStoppedTime, false, \ 647 "Print the time the application has been stopped") \ 648 \ 649 develop(bool, Verbose, false, \ 650 "Prints additional debugging information from other modes") \ 651 \ 652 develop(bool, PrintMiscellaneous, false, \ 653 "Prints uncategorized debugging information (requires +Verbose)") \ 654 \ 655 develop(bool, WizardMode, false, \ 656 "Prints much more debugging information") \ 657 \ 658 product(bool, ShowMessageBoxOnError, false, \ 659 "Keep process alive on VM fatal error") \ 660 \ 661 product_pd(bool, UseOSErrorReporting, \ 662 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 663 \ 664 product(bool, SuppressFatalErrorMessage, false, \ 665 "Do NO Fatal Error report [Avoid deadlock]") \ 666 \ 667 product(ccstrlist, OnError, "", \ 668 "Run user-defined commands on fatal error; see VMError.cpp " \ 669 "for examples") \ 670 \ 671 product(ccstrlist, OnOutOfMemoryError, "", \ 672 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 673 \ 674 manageable(bool, HeapDumpBeforeFullGC, false, \ 675 "Dump heap to file before any major stop-world GC") \ 676 \ 677 manageable(bool, HeapDumpAfterFullGC, false, \ 678 "Dump heap to file after any major stop-world GC") \ 679 \ 680 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 681 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 682 \ 683 manageable(ccstr, HeapDumpPath, NULL, \ 684 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 685 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 686 "in the working directory)") \ 687 \ 688 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 689 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 690 "when the heap usage is larger than this") \ 691 \ 692 develop(uintx, HeapDumpSegmentSize, 1*G, \ 693 "Approximate segment size when generating a segmented heap dump") \ 694 \ 695 develop(bool, BreakAtWarning, false, \ 696 "Execute breakpoint upon encountering VM warning") \ 697 \ 698 product_pd(bool, UseVectoredExceptions, \ 699 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 700 \ 701 develop(bool, TraceVMOperation, false, \ 702 "Trace vm operations") \ 703 \ 704 develop(bool, UseFakeTimers, false, \ 705 "Tells whether the VM should use system time or a fake timer") \ 706 \ 707 diagnostic(bool, LogCompilation, false, \ 708 "Log compilation activity in detail to hotspot.log or LogFile") \ 709 \ 710 product(bool, PrintCompilation, false, \ 711 "Print compilations") \ 712 \ 713 diagnostic(bool, TraceNMethodInstalls, false, \ 714 "Trace nmethod intallation") \ 715 \ 716 diagnostic(intx, ScavengeRootsInCode, 0, \ 717 "0: do not allow scavengable oops in the code cache; " \ 718 "1: allow scavenging from the code cache; " \ 719 "2: emit as many constants as the compiler can see") \ 720 \ 721 diagnostic(bool, TraceOSRBreakpoint, false, \ 722 "Trace OSR Breakpoint ") \ 723 \ 724 diagnostic(bool, TraceCompileTriggered, false, \ 725 "Trace compile triggered") \ 726 \ 727 diagnostic(bool, TraceTriggers, false, \ 728 "Trace triggers") \ 729 \ 730 product(bool, AlwaysRestoreFPU, false, \ 731 "Restore the FPU control word after every JNI call (expensive)") \ 732 \ 733 notproduct(bool, PrintCompilation2, false, \ 734 "Print additional statistics per compilation") \ 735 \ 736 diagnostic(bool, PrintAdapterHandlers, false, \ 737 "Print code generated for i2c/c2i adapters") \ 738 \ 739 diagnostic(bool, PrintAssembly, false, \ 740 "Print assembly code (using external disassembler.so)") \ 741 \ 742 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 743 "Options string passed to disassembler.so") \ 744 \ 745 diagnostic(bool, PrintNMethods, false, \ 746 "Print assembly code for nmethods when generated") \ 747 \ 748 diagnostic(bool, PrintNativeNMethods, false, \ 749 "Print assembly code for native nmethods when generated") \ 750 \ 751 develop(bool, PrintDebugInfo, false, \ 752 "Print debug information for all nmethods when generated") \ 753 \ 754 develop(bool, PrintRelocations, false, \ 755 "Print relocation information for all nmethods when generated") \ 756 \ 757 develop(bool, PrintDependencies, false, \ 758 "Print dependency information for all nmethods when generated") \ 759 \ 760 develop(bool, PrintExceptionHandlers, false, \ 761 "Print exception handler tables for all nmethods when generated") \ 762 \ 763 develop(bool, InterceptOSException, false, \ 764 "Starts debugger when an implicit OS (e.g., NULL) " \ 765 "exception happens") \ 766 \ 767 notproduct(bool, PrintCodeCache, false, \ 768 "Print the compiled_code cache when exiting") \ 769 \ 770 develop(bool, PrintCodeCache2, false, \ 771 "Print detailed info on the compiled_code cache when exiting") \ 772 \ 773 diagnostic(bool, PrintStubCode, false, \ 774 "Print generated stub code") \ 775 \ 776 product(bool, StackTraceInThrowable, true, \ 777 "Collect backtrace in throwable when exception happens") \ 778 \ 779 product(bool, OmitStackTraceInFastThrow, true, \ 780 "Omit backtraces for some 'hot' exceptions in optimized code") \ 781 \ 782 product(bool, ProfilerPrintByteCodeStatistics, false, \ 783 "Prints byte code statictics when dumping profiler output") \ 784 \ 785 product(bool, ProfilerRecordPC, false, \ 786 "Collects tick for each 16 byte interval of compiled code") \ 787 \ 788 product(bool, ProfileVM, false, \ 789 "Profiles ticks that fall within VM (either in the VM Thread " \ 790 "or VM code called through stubs)") \ 791 \ 792 product(bool, ProfileIntervals, false, \ 793 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 794 \ 795 notproduct(bool, ProfilerCheckIntervals, false, \ 796 "Collect and print info on spacing of profiler ticks") \ 797 \ 798 develop(bool, PrintJVMWarnings, false, \ 799 "Prints warnings for unimplemented JVM functions") \ 800 \ 801 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 802 "Prints warnings for stalled SpinLocks") \ 803 \ 804 develop(bool, InitializeJavaLangSystem, true, \ 805 "Initialize java.lang.System - turn off for individual " \ 806 "method debugging") \ 807 \ 808 develop(bool, InitializeJavaLangString, true, \ 809 "Initialize java.lang.String - turn off for individual " \ 810 "method debugging") \ 811 \ 812 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 813 "Initialize various error and exception classes - turn off for " \ 814 "individual method debugging") \ 815 \ 816 product(bool, RegisterFinalizersAtInit, true, \ 817 "Register finalizable objects at end of Object.<init> or " \ 818 "after allocation.") \ 819 \ 820 develop(bool, RegisterReferences, true, \ 821 "Tells whether the VM should register soft/weak/final/phantom " \ 822 "references") \ 823 \ 824 develop(bool, IgnoreRewrites, false, \ 825 "Supress rewrites of bytecodes in the oopmap generator. " \ 826 "This is unsafe!") \ 827 \ 828 develop(bool, PrintCodeCacheExtension, false, \ 829 "Print extension of code cache") \ 830 \ 831 develop(bool, UsePrivilegedStack, true, \ 832 "Enable the security JVM functions") \ 833 \ 834 develop(bool, IEEEPrecision, true, \ 835 "Enables IEEE precision (for INTEL only)") \ 836 \ 837 develop(bool, ProtectionDomainVerification, true, \ 838 "Verifies protection domain before resolution in system " \ 839 "dictionary") \ 840 \ 841 product(bool, ClassUnloading, true, \ 842 "Do unloading of classes") \ 843 \ 844 diagnostic(bool, LinkWellKnownClasses, false, \ 845 "Resolve a well known class as soon as its name is seen") \ 846 \ 847 develop(bool, DisableStartThread, false, \ 848 "Disable starting of additional Java threads " \ 849 "(for debugging only)") \ 850 \ 851 develop(bool, MemProfiling, false, \ 852 "Write memory usage profiling to log file") \ 853 \ 854 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 855 "Prints the system dictionary at exit") \ 856 \ 857 diagnostic(bool, UnsyncloadClass, false, \ 858 "Unstable: VM calls loadClass unsynchronized. Custom " \ 859 "class loader must call VM synchronized for findClass " \ 860 "and defineClass.") \ 861 \ 862 product(bool, AlwaysLockClassLoader, false, \ 863 "Require the VM to acquire the class loader lock before calling " \ 864 "loadClass() even for class loaders registering " \ 865 "as parallel capable. Default false. ") \ 866 \ 867 product(bool, AllowParallelDefineClass, false, \ 868 "Allow parallel defineClass requests for class loaders " \ 869 "registering as parallel capable. Default false") \ 870 \ 871 product(bool, MustCallLoadClassInternal, false, \ 872 "Call loadClassInternal() rather than loadClass().Default false") \ 873 \ 874 product_pd(bool, DontYieldALot, \ 875 "Throw away obvious excess yield calls (for SOLARIS only)") \ 876 \ 877 product_pd(bool, ConvertSleepToYield, \ 878 "Converts sleep(0) to thread yield " \ 879 "(may be off for SOLARIS to improve GUI)") \ 880 \ 881 product(bool, ConvertYieldToSleep, false, \ 882 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 883 "behavior (SOLARIS only)") \ 884 \ 885 product(bool, UseBoundThreads, true, \ 886 "Bind user level threads to kernel threads (for SOLARIS only)") \ 887 \ 888 develop(bool, UseDetachedThreads, true, \ 889 "Use detached threads that are recycled upon termination " \ 890 "(for SOLARIS only)") \ 891 \ 892 product(bool, UseLWPSynchronization, true, \ 893 "Use LWP-based instead of libthread-based synchronization " \ 894 "(SPARC only)") \ 895 \ 896 product(ccstr, SyncKnobs, NULL, \ 897 "(Unstable) Various monitor synchronization tunables") \ 898 \ 899 product(intx, EmitSync, 0, \ 900 "(Unsafe,Unstable) " \ 901 " Controls emission of inline sync fast-path code") \ 902 \ 903 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 904 \ 905 product(intx, Atomics, 0, \ 906 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 907 \ 908 product(intx, FenceInstruction, 0, \ 909 "(Unsafe,Unstable) Experimental") \ 910 \ 911 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 912 \ 913 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 914 \ 915 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 916 \ 917 product(intx, hashCode, 0, \ 918 "(Unstable) select hashCode generation algorithm" ) \ 919 \ 920 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 921 "(Unstable, Linux-specific)" \ 922 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 923 \ 924 product(bool, FilterSpuriousWakeups , true, \ 925 "Prevent spurious or premature wakeups from object.wait" \ 926 "(Solaris only)") \ 927 \ 928 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 929 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 930 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 931 \ 932 develop(bool, UsePthreads, false, \ 933 "Use pthread-based instead of libthread-based synchronization " \ 934 "(SPARC only)") \ 935 \ 936 product(bool, AdjustConcurrency, false, \ 937 "call thr_setconcurrency at thread create time to avoid " \ 938 "LWP starvation on MP systems (For Solaris Only)") \ 939 \ 940 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 941 "Should the system attempt to update the compiler file when " \ 942 "an error occurs?") \ 943 \ 944 product(bool, ReduceSignalUsage, false, \ 945 "Reduce the use of OS signals in Java and/or the VM") \ 946 \ 947 notproduct(bool, ValidateMarkSweep, false, \ 948 "Do extra validation during MarkSweep collection") \ 949 \ 950 notproduct(bool, RecordMarkSweepCompaction, false, \ 951 "Enable GC-to-GC recording and querying of compaction during " \ 952 "MarkSweep") \ 953 \ 954 develop_pd(bool, ShareVtableStubs, \ 955 "Share vtable stubs (smaller code but worse branch prediction") \ 956 \ 957 develop(bool, LoadLineNumberTables, true, \ 958 "Tells whether the class file parser loads line number tables") \ 959 \ 960 develop(bool, LoadLocalVariableTables, true, \ 961 "Tells whether the class file parser loads local variable tables")\ 962 \ 963 develop(bool, LoadLocalVariableTypeTables, true, \ 964 "Tells whether the class file parser loads local variable type tables")\ 965 \ 966 product(bool, AllowUserSignalHandlers, false, \ 967 "Do not complain if the application installs signal handlers " \ 968 "(Solaris & Linux only)") \ 969 \ 970 product(bool, UseSignalChaining, true, \ 971 "Use signal-chaining to invoke signal handlers installed " \ 972 "by the application (Solaris & Linux only)") \ 973 \ 974 product(bool, UseAltSigs, false, \ 975 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 976 "internal signals. (Solaris only)") \ 977 \ 978 product(bool, UseSpinning, false, \ 979 "Use spinning in monitor inflation and before entry") \ 980 \ 981 product(bool, PreSpinYield, false, \ 982 "Yield before inner spinning loop") \ 983 \ 984 product(bool, PostSpinYield, true, \ 985 "Yield after inner spinning loop") \ 986 \ 987 product(bool, AllowJNIEnvProxy, false, \ 988 "Allow JNIEnv proxies for jdbx") \ 989 \ 990 product(bool, JNIDetachReleasesMonitors, true, \ 991 "JNI DetachCurrentThread releases monitors owned by thread") \ 992 \ 993 product(bool, RestoreMXCSROnJNICalls, false, \ 994 "Restore MXCSR when returning from JNI calls") \ 995 \ 996 product(bool, CheckJNICalls, false, \ 997 "Verify all arguments to JNI calls") \ 998 \ 999 product(bool, UseFastJNIAccessors, true, \ 1000 "Use optimized versions of Get<Primitive>Field") \ 1001 \ 1002 product(bool, EagerXrunInit, false, \ 1003 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1004 " but not all -Xrun libraries may support the state of the VM at this time") \ 1005 \ 1006 product(bool, PreserveAllAnnotations, false, \ 1007 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1008 \ 1009 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1010 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1011 \ 1012 product(bool, LazyBootClassLoader, true, \ 1013 "Enable/disable lazy opening of boot class path entries") \ 1014 \ 1015 diagnostic(bool, UseIncDec, true, \ 1016 "Use INC, DEC instructions on x86") \ 1017 \ 1018 product(bool, UseNewLongLShift, false, \ 1019 "Use optimized bitwise shift left") \ 1020 \ 1021 product(bool, UseStoreImmI16, true, \ 1022 "Use store immediate 16-bits value instruction on x86") \ 1023 \ 1024 product(bool, UseAddressNop, false, \ 1025 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1026 \ 1027 product(bool, UseXmmLoadAndClearUpper, true, \ 1028 "Load low part of XMM register and clear upper part") \ 1029 \ 1030 product(bool, UseXmmRegToRegMoveAll, false, \ 1031 "Copy all XMM register bits when moving value between registers") \ 1032 \ 1033 product(bool, UseXmmI2D, false, \ 1034 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1035 \ 1036 product(bool, UseXmmI2F, false, \ 1037 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1038 \ 1039 product(bool, UseXMMForArrayCopy, false, \ 1040 "Use SSE2 MOVQ instruction for Arraycopy") \ 1041 \ 1042 product(bool, UseUnalignedLoadStores, false, \ 1043 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1044 \ 1045 product(intx, FieldsAllocationStyle, 1, \ 1046 "0 - type based with oops first, 1 - with oops last") \ 1047 \ 1048 product(bool, CompactFields, true, \ 1049 "Allocate nonstatic fields in gaps between previous fields") \ 1050 \ 1051 notproduct(bool, PrintCompactFieldsSavings, false, \ 1052 "Print how many words were saved with CompactFields") \ 1053 \ 1054 product(bool, UseBiasedLocking, true, \ 1055 "Enable biased locking in JVM") \ 1056 \ 1057 product(intx, BiasedLockingStartupDelay, 4000, \ 1058 "Number of milliseconds to wait before enabling biased locking") \ 1059 \ 1060 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1061 "Print statistics of biased locking in JVM") \ 1062 \ 1063 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1064 "Threshold of number of revocations per type to try to " \ 1065 "rebias all objects in the heap of that type") \ 1066 \ 1067 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1068 "Threshold of number of revocations per type to permanently " \ 1069 "revoke biases of all objects in the heap of that type") \ 1070 \ 1071 product(intx, BiasedLockingDecayTime, 25000, \ 1072 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1073 "type after previous bulk rebias") \ 1074 \ 1075 /* tracing */ \ 1076 \ 1077 notproduct(bool, TraceRuntimeCalls, false, \ 1078 "Trace run-time calls") \ 1079 \ 1080 develop(bool, TraceJNICalls, false, \ 1081 "Trace JNI calls") \ 1082 \ 1083 notproduct(bool, TraceJVMCalls, false, \ 1084 "Trace JVM calls") \ 1085 \ 1086 product(ccstr, TraceJVMTI, NULL, \ 1087 "Trace flags for JVMTI functions and events") \ 1088 \ 1089 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1090 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1091 \ 1092 /* This option can change an EMCP method into an obsolete method. */ \ 1093 /* This can affect tests that except specific methods to be EMCP. */ \ 1094 /* This option should be used with caution. */ \ 1095 product(bool, StressLdcRewrite, false, \ 1096 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1097 \ 1098 product(intx, TraceRedefineClasses, 0, \ 1099 "Trace level for JVMTI RedefineClasses") \ 1100 \ 1101 /* change to false by default sometime after Mustang */ \ 1102 product(bool, VerifyMergedCPBytecodes, true, \ 1103 "Verify bytecodes after RedefineClasses constant pool merging") \ 1104 \ 1105 develop(bool, TraceJNIHandleAllocation, false, \ 1106 "Trace allocation/deallocation of JNI handle blocks") \ 1107 \ 1108 develop(bool, TraceThreadEvents, false, \ 1109 "Trace all thread events") \ 1110 \ 1111 develop(bool, TraceBytecodes, false, \ 1112 "Trace bytecode execution") \ 1113 \ 1114 develop(bool, TraceClassInitialization, false, \ 1115 "Trace class initialization") \ 1116 \ 1117 develop(bool, TraceExceptions, false, \ 1118 "Trace exceptions") \ 1119 \ 1120 develop(bool, TraceICs, false, \ 1121 "Trace inline cache changes") \ 1122 \ 1123 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1124 "Trace method invocation counter overflow") \ 1125 \ 1126 develop(bool, TraceInlineCacheClearing, false, \ 1127 "Trace clearing of inline caches in nmethods") \ 1128 \ 1129 develop(bool, TraceDependencies, false, \ 1130 "Trace dependencies") \ 1131 \ 1132 develop(bool, VerifyDependencies, trueInDebug, \ 1133 "Exercise and verify the compilation dependency mechanism") \ 1134 \ 1135 develop(bool, TraceNewOopMapGeneration, false, \ 1136 "Trace OopMapGeneration") \ 1137 \ 1138 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1139 "Trace OopMapGeneration: print detailed cell states") \ 1140 \ 1141 develop(bool, TimeOopMap, false, \ 1142 "Time calls to GenerateOopMap::compute_map() in sum") \ 1143 \ 1144 develop(bool, TimeOopMap2, false, \ 1145 "Time calls to GenerateOopMap::compute_map() individually") \ 1146 \ 1147 develop(bool, TraceMonitorMismatch, false, \ 1148 "Trace monitor matching failures during OopMapGeneration") \ 1149 \ 1150 develop(bool, TraceOopMapRewrites, false, \ 1151 "Trace rewritting of method oops during oop map generation") \ 1152 \ 1153 develop(bool, TraceSafepoint, false, \ 1154 "Trace safepoint operations") \ 1155 \ 1156 develop(bool, TraceICBuffer, false, \ 1157 "Trace usage of IC buffer") \ 1158 \ 1159 develop(bool, TraceCompiledIC, false, \ 1160 "Trace changes of compiled IC") \ 1161 \ 1162 notproduct(bool, TraceZapDeadLocals, false, \ 1163 "Trace zapping dead locals") \ 1164 \ 1165 develop(bool, TraceStartupTime, false, \ 1166 "Trace setup time") \ 1167 \ 1168 develop(bool, TraceHPI, false, \ 1169 "Trace Host Porting Interface (HPI)") \ 1170 \ 1171 product(ccstr, HPILibPath, NULL, \ 1172 "Specify alternate path to HPI library") \ 1173 \ 1174 develop(bool, TraceProtectionDomainVerification, false, \ 1175 "Trace protection domain verifcation") \ 1176 \ 1177 develop(bool, TraceClearedExceptions, false, \ 1178 "Prints when an exception is forcibly cleared") \ 1179 \ 1180 product(bool, TraceClassResolution, false, \ 1181 "Trace all constant pool resolutions (for debugging)") \ 1182 \ 1183 product(bool, TraceBiasedLocking, false, \ 1184 "Trace biased locking in JVM") \ 1185 \ 1186 product(bool, TraceMonitorInflation, false, \ 1187 "Trace monitor inflation in JVM") \ 1188 \ 1189 /* assembler */ \ 1190 product(bool, Use486InstrsOnly, false, \ 1191 "Use 80486 Compliant instruction subset") \ 1192 \ 1193 /* gc */ \ 1194 \ 1195 product(bool, UseSerialGC, false, \ 1196 "Use the serial garbage collector") \ 1197 \ 1198 experimental(bool, UseG1GC, false, \ 1199 "Use the Garbage-First garbage collector") \ 1200 \ 1201 product(bool, UseParallelGC, false, \ 1202 "Use the Parallel Scavenge garbage collector") \ 1203 \ 1204 product(bool, UseParallelOldGC, false, \ 1205 "Use the Parallel Old garbage collector") \ 1206 \ 1207 product(bool, UseParallelOldGCCompacting, true, \ 1208 "In the Parallel Old garbage collector use parallel compaction") \ 1209 \ 1210 product(bool, UseParallelDensePrefixUpdate, true, \ 1211 "In the Parallel Old garbage collector use parallel dense" \ 1212 " prefix update") \ 1213 \ 1214 product(uintx, HeapMaximumCompactionInterval, 20, \ 1215 "How often should we maximally compact the heap (not allowing " \ 1216 "any dead space)") \ 1217 \ 1218 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1219 "The collection count for the first maximum compaction") \ 1220 \ 1221 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1222 "In the Parallel Old garbage collector maximum compaction for " \ 1223 "a system GC") \ 1224 \ 1225 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1226 "The mean used by the par compact dead wood" \ 1227 "limiter (a number between 0-100).") \ 1228 \ 1229 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1230 "The standard deviation used by the par compact dead wood" \ 1231 "limiter (a number between 0-100).") \ 1232 \ 1233 product(bool, UseParallelOldGCDensePrefix, true, \ 1234 "Use a dense prefix with the Parallel Old garbage collector") \ 1235 \ 1236 product(uintx, ParallelGCThreads, 0, \ 1237 "Number of parallel threads parallel gc will use") \ 1238 \ 1239 product(uintx, ParallelCMSThreads, 0, \ 1240 "Max number of threads CMS will use for concurrent work") \ 1241 \ 1242 develop(bool, ParallelOldGCSplitALot, false, \ 1243 "Provoke splitting (copying data from a young gen space to" \ 1244 "multiple destination spaces)") \ 1245 \ 1246 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1247 "How often to provoke splitting a young gen space") \ 1248 \ 1249 develop(bool, TraceRegionTasksQueuing, false, \ 1250 "Trace the queuing of the region tasks") \ 1251 \ 1252 product(uintx, ParallelMarkingThreads, 0, \ 1253 "Number of marking threads concurrent gc will use") \ 1254 \ 1255 product(uintx, YoungPLABSize, 4096, \ 1256 "Size of young gen promotion labs (in HeapWords)") \ 1257 \ 1258 product(uintx, OldPLABSize, 1024, \ 1259 "Size of old gen promotion labs (in HeapWords)") \ 1260 \ 1261 product(uintx, GCTaskTimeStampEntries, 200, \ 1262 "Number of time stamp entries per gc worker thread") \ 1263 \ 1264 product(bool, AlwaysTenure, false, \ 1265 "Always tenure objects in eden. (ParallelGC only)") \ 1266 \ 1267 product(bool, NeverTenure, false, \ 1268 "Never tenure objects in eden, May tenure on overflow" \ 1269 " (ParallelGC only)") \ 1270 \ 1271 product(bool, ScavengeBeforeFullGC, true, \ 1272 "Scavenge youngest generation before each full GC," \ 1273 " used with UseParallelGC") \ 1274 \ 1275 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1276 "Allow scavenges to occur when to_space contains objects.") \ 1277 \ 1278 product(bool, UseConcMarkSweepGC, false, \ 1279 "Use Concurrent Mark-Sweep GC in the old generation") \ 1280 \ 1281 product(bool, ExplicitGCInvokesConcurrent, false, \ 1282 "A System.gc() request invokes a concurrent collection;" \ 1283 " (effective only when UseConcMarkSweepGC)") \ 1284 \ 1285 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1286 "A System.gc() request invokes a concurrent collection and" \ 1287 " also unloads classes during such a concurrent gc cycle " \ 1288 " (effective only when UseConcMarkSweepGC)") \ 1289 \ 1290 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1291 "Use Adaptive Free Lists in the CMS generation") \ 1292 \ 1293 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1294 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1295 \ 1296 develop(bool, RotateCMSCollectionTypes, false, \ 1297 "Rotate the CMS collections among concurrent and STW") \ 1298 \ 1299 product(bool, UseCMSBestFit, true, \ 1300 "Use CMS best fit allocation strategy") \ 1301 \ 1302 product(bool, UseCMSCollectionPassing, true, \ 1303 "Use passing of collection from background to foreground") \ 1304 \ 1305 product(bool, UseParNewGC, false, \ 1306 "Use parallel threads in the new generation.") \ 1307 \ 1308 product(bool, ParallelGCVerbose, false, \ 1309 "Verbose output for parallel GC.") \ 1310 \ 1311 product(intx, ParallelGCBufferWastePct, 10, \ 1312 "wasted fraction of parallel allocation buffer.") \ 1313 \ 1314 product(bool, ParallelGCRetainPLAB, true, \ 1315 "Retain parallel allocation buffers across scavenges.") \ 1316 \ 1317 product(intx, TargetPLABWastePct, 10, \ 1318 "target wasted space in last buffer as pct of overall allocation")\ 1319 \ 1320 product(uintx, PLABWeight, 75, \ 1321 "Percentage (0-100) used to weight the current sample when" \ 1322 "computing exponentially decaying average for ResizePLAB.") \ 1323 \ 1324 product(bool, ResizePLAB, true, \ 1325 "Dynamically resize (survivor space) promotion labs") \ 1326 \ 1327 product(bool, PrintPLAB, false, \ 1328 "Print (survivor space) promotion labs sizing decisions") \ 1329 \ 1330 product(intx, ParGCArrayScanChunk, 50, \ 1331 "Scan a subset and push remainder, if array is bigger than this") \ 1332 \ 1333 product(bool, ParGCUseLocalOverflow, false, \ 1334 "Instead of a global overflow list, use local overflow stacks") \ 1335 \ 1336 product(bool, ParGCTrimOverflow, true, \ 1337 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1338 \ 1339 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1340 "Whether we should simulate work queue overflow in ParNew") \ 1341 \ 1342 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1343 "An `interval' counter that determines how frequently" \ 1344 " we simulate overflow; a smaller number increases frequency") \ 1345 \ 1346 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1347 "The desired number of objects to claim from the overflow list") \ 1348 \ 1349 product(uintx, CMSParPromoteBlocksToClaim, 50, \ 1350 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1351 "parallel GC.") \ 1352 \ 1353 product(bool, AlwaysPreTouch, false, \ 1354 "It forces all freshly committed pages to be pre-touched.") \ 1355 \ 1356 product(bool, CMSUseOldDefaults, false, \ 1357 "A flag temporarily introduced to allow reverting to some older" \ 1358 "default settings; older as of 6.0 ") \ 1359 \ 1360 product(intx, CMSYoungGenPerWorker, 16*M, \ 1361 "The amount of young gen chosen by default per GC worker " \ 1362 "thread available ") \ 1363 \ 1364 product(bool, GCOverheadReporting, false, \ 1365 "Enables the GC overhead reporting facility") \ 1366 \ 1367 product(intx, GCOverheadReportingPeriodMS, 100, \ 1368 "Reporting period for conc GC overhead reporting, in ms ") \ 1369 \ 1370 product(bool, CMSIncrementalMode, false, \ 1371 "Whether CMS GC should operate in \"incremental\" mode") \ 1372 \ 1373 product(uintx, CMSIncrementalDutyCycle, 10, \ 1374 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1375 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1376 "value") \ 1377 \ 1378 product(bool, CMSIncrementalPacing, true, \ 1379 "Whether the CMS incremental mode duty cycle should be " \ 1380 "automatically adjusted") \ 1381 \ 1382 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1383 "Lower bound on the duty cycle when CMSIncrementalPacing is" \ 1384 "enabled (a percentage, 0-100).") \ 1385 \ 1386 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1387 "Percentage (0-100) used to add conservatism when computing the" \ 1388 "duty cycle.") \ 1389 \ 1390 product(uintx, CMSIncrementalOffset, 0, \ 1391 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1392 "is shifted to the right within the period between young GCs") \ 1393 \ 1394 product(uintx, CMSExpAvgFactor, 25, \ 1395 "Percentage (0-100) used to weight the current sample when" \ 1396 "computing exponential averages for CMS statistics.") \ 1397 \ 1398 product(uintx, CMS_FLSWeight, 50, \ 1399 "Percentage (0-100) used to weight the current sample when" \ 1400 "computing exponentially decating averages for CMS FLS statistics.") \ 1401 \ 1402 product(uintx, CMS_FLSPadding, 2, \ 1403 "The multiple of deviation from mean to use for buffering" \ 1404 "against volatility in free list demand.") \ 1405 \ 1406 product(uintx, FLSCoalescePolicy, 2, \ 1407 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1408 \ 1409 product(uintx, CMS_SweepWeight, 50, \ 1410 "Percentage (0-100) used to weight the current sample when" \ 1411 "computing exponentially decaying average for inter-sweep duration.") \ 1412 \ 1413 product(uintx, CMS_SweepPadding, 2, \ 1414 "The multiple of deviation from mean to use for buffering" \ 1415 "against volatility in inter-sweep duration.") \ 1416 \ 1417 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1418 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1419 " duration exceeds this threhold in milliseconds") \ 1420 \ 1421 develop(bool, CMSTraceIncrementalMode, false, \ 1422 "Trace CMS incremental mode") \ 1423 \ 1424 develop(bool, CMSTraceIncrementalPacing, false, \ 1425 "Trace CMS incremental mode pacing computation") \ 1426 \ 1427 develop(bool, CMSTraceThreadState, false, \ 1428 "Trace the CMS thread state (enable the trace_state() method)") \ 1429 \ 1430 product(bool, CMSClassUnloadingEnabled, false, \ 1431 "Whether class unloading enabled when using CMS GC") \ 1432 \ 1433 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1434 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1435 " for which classes may not be unloaded") \ 1436 \ 1437 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1438 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1439 \ 1440 product(bool, UseCMSCompactAtFullCollection, true, \ 1441 "Use mark sweep compact at full collections") \ 1442 \ 1443 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1444 "Number of CMS full collection done before compaction if > 0") \ 1445 \ 1446 develop(intx, CMSDictionaryChoice, 0, \ 1447 "Use BinaryTreeDictionary as default in the CMS generation") \ 1448 \ 1449 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1450 "Replenish and indexed free list with this number of chunks") \ 1451 \ 1452 product(bool, CMSLoopWarn, false, \ 1453 "Warn in case of excessive CMS looping") \ 1454 \ 1455 develop(bool, CMSOverflowEarlyRestoration, false, \ 1456 "Whether preserved marks should be restored early") \ 1457 \ 1458 product(uintx, CMSMarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1459 "Size of CMS marking stack") \ 1460 \ 1461 product(uintx, CMSMarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1462 "Max size of CMS marking stack") \ 1463 \ 1464 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1465 "Whether we should simulate frequent marking stack / work queue" \ 1466 " overflow") \ 1467 \ 1468 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1469 "An `interval' counter that determines how frequently" \ 1470 " we simulate overflow; a smaller number increases frequency") \ 1471 \ 1472 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1473 "(Temporary, subject to experimentation)" \ 1474 "Maximum number of abortable preclean iterations, if > 0") \ 1475 \ 1476 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1477 "(Temporary, subject to experimentation)" \ 1478 "Maximum time in abortable preclean in ms") \ 1479 \ 1480 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1481 "(Temporary, subject to experimentation)" \ 1482 "Nominal minimum work per abortable preclean iteration") \ 1483 \ 1484 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1485 "(Temporary, subject to experimentation)" \ 1486 " Time that we sleep between iterations when not given" \ 1487 " enough work per iteration") \ 1488 \ 1489 product(uintx, CMSRescanMultiple, 32, \ 1490 "Size (in cards) of CMS parallel rescan task") \ 1491 \ 1492 product(uintx, CMSConcMarkMultiple, 32, \ 1493 "Size (in cards) of CMS concurrent MT marking task") \ 1494 \ 1495 product(uintx, CMSRevisitStackSize, 1*M, \ 1496 "Size of CMS KlassKlass revisit stack") \ 1497 \ 1498 product(bool, CMSAbortSemantics, false, \ 1499 "Whether abort-on-overflow semantics is implemented") \ 1500 \ 1501 product(bool, CMSParallelRemarkEnabled, true, \ 1502 "Whether parallel remark enabled (only if ParNewGC)") \ 1503 \ 1504 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1505 "Whether parallel remark of survivor space" \ 1506 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1507 \ 1508 product(bool, CMSPLABRecordAlways, true, \ 1509 "Whether to always record survivor space PLAB bdries" \ 1510 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1511 \ 1512 product(bool, CMSConcurrentMTEnabled, true, \ 1513 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1514 \ 1515 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1516 "Whether concurrent precleaning enabled in perm gen" \ 1517 " (effective only when CMSPrecleaningEnabled is true)") \ 1518 \ 1519 product(bool, CMSPrecleaningEnabled, true, \ 1520 "Whether concurrent precleaning enabled") \ 1521 \ 1522 product(uintx, CMSPrecleanIter, 3, \ 1523 "Maximum number of precleaning iteration passes") \ 1524 \ 1525 product(uintx, CMSPrecleanNumerator, 2, \ 1526 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1527 " ratio") \ 1528 \ 1529 product(uintx, CMSPrecleanDenominator, 3, \ 1530 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1531 " ratio") \ 1532 \ 1533 product(bool, CMSPrecleanRefLists1, true, \ 1534 "Preclean ref lists during (initial) preclean phase") \ 1535 \ 1536 product(bool, CMSPrecleanRefLists2, false, \ 1537 "Preclean ref lists during abortable preclean phase") \ 1538 \ 1539 product(bool, CMSPrecleanSurvivors1, false, \ 1540 "Preclean survivors during (initial) preclean phase") \ 1541 \ 1542 product(bool, CMSPrecleanSurvivors2, true, \ 1543 "Preclean survivors during abortable preclean phase") \ 1544 \ 1545 product(uintx, CMSPrecleanThreshold, 1000, \ 1546 "Don't re-iterate if #dirty cards less than this") \ 1547 \ 1548 product(bool, CMSCleanOnEnter, true, \ 1549 "Clean-on-enter optimization for reducing number of dirty cards") \ 1550 \ 1551 product(uintx, CMSRemarkVerifyVariant, 1, \ 1552 "Choose variant (1,2) of verification following remark") \ 1553 \ 1554 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1555 "If Eden used is below this value, don't try to schedule remark") \ 1556 \ 1557 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1558 "The Eden occupancy % at which to try and schedule remark pause") \ 1559 \ 1560 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1561 "Start sampling Eden top at least before yg occupancy reaches" \ 1562 " 1/<ratio> of the size at which we plan to schedule remark") \ 1563 \ 1564 product(uintx, CMSSamplingGrain, 16*K, \ 1565 "The minimum distance between eden samples for CMS (see above)") \ 1566 \ 1567 product(bool, CMSScavengeBeforeRemark, false, \ 1568 "Attempt scavenge before the CMS remark step") \ 1569 \ 1570 develop(bool, CMSTraceSweeper, false, \ 1571 "Trace some actions of the CMS sweeper") \ 1572 \ 1573 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1574 "Don't drain below this size per parallel worker/thief") \ 1575 \ 1576 product(intx, CMSWaitDuration, 2000, \ 1577 "Time in milliseconds that CMS thread waits for young GC") \ 1578 \ 1579 product(bool, CMSYield, true, \ 1580 "Yield between steps of concurrent mark & sweep") \ 1581 \ 1582 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1583 "Bitmap operations should process at most this many bits" \ 1584 "between yields") \ 1585 \ 1586 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1587 "Verify that all refs across the FLS boundary " \ 1588 " are to valid objects") \ 1589 \ 1590 diagnostic(bool, FLSVerifyLists, false, \ 1591 "Do lots of (expensive) FreeListSpace verification") \ 1592 \ 1593 diagnostic(bool, FLSVerifyIndexTable, false, \ 1594 "Do lots of (expensive) FLS index table verification") \ 1595 \ 1596 develop(bool, FLSVerifyDictionary, false, \ 1597 "Do lots of (expensive) FLS dictionary verification") \ 1598 \ 1599 develop(bool, VerifyBlockOffsetArray, false, \ 1600 "Do (expensive!) block offset array verification") \ 1601 \ 1602 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1603 "Maintain _unallocated_block in BlockOffsetArray" \ 1604 " (currently applicable only to CMS collector)") \ 1605 \ 1606 develop(bool, TraceCMSState, false, \ 1607 "Trace the state of the CMS collection") \ 1608 \ 1609 product(intx, RefDiscoveryPolicy, 0, \ 1610 "Whether reference-based(0) or referent-based(1)") \ 1611 \ 1612 product(bool, ParallelRefProcEnabled, false, \ 1613 "Enable parallel reference processing whenever possible") \ 1614 \ 1615 product(bool, ParallelRefProcBalancingEnabled, true, \ 1616 "Enable balancing of reference processing queues") \ 1617 \ 1618 product(intx, CMSTriggerRatio, 80, \ 1619 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1620 " allocated before a CMS collection cycle commences") \ 1621 \ 1622 product(intx, CMSTriggerPermRatio, 80, \ 1623 "Percentage of MinHeapFreeRatio in the CMS perm generation that" \ 1624 " is allocated before a CMS collection cycle commences, that " \ 1625 " also collects the perm generation") \ 1626 \ 1627 product(uintx, CMSBootstrapOccupancy, 50, \ 1628 "Percentage CMS generation occupancy at which to " \ 1629 " initiate CMS collection for bootstrapping collection stats") \ 1630 \ 1631 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1632 "Percentage CMS generation occupancy to start a CMS collection " \ 1633 " cycle (A negative value means that CMSTriggerRatio is used)") \ 1634 \ 1635 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1636 "Percentage CMS perm generation occupancy to start a CMScollection"\ 1637 " cycle (A negative value means that CMSTriggerPermRatio is used)")\ 1638 \ 1639 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1640 "Only use occupancy as a crierion for starting a CMS collection") \ 1641 \ 1642 product(intx, CMSIsTooFullPercentage, 98, \ 1643 "An absolute ceiling above which CMS will always consider the" \ 1644 " perm gen ripe for collection") \ 1645 \ 1646 develop(bool, CMSTestInFreeList, false, \ 1647 "Check if the coalesced range is already in the " \ 1648 "free lists as claimed.") \ 1649 \ 1650 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1651 "Check that all the garbage collected was returned to the " \ 1652 "free lists.") \ 1653 \ 1654 notproduct(bool, ScavengeALot, false, \ 1655 "Force scavenge at every Nth exit from the runtime system " \ 1656 "(N=ScavengeALotInterval)") \ 1657 \ 1658 develop(bool, FullGCALot, false, \ 1659 "Force full gc at every Nth exit from the runtime system " \ 1660 "(N=FullGCALotInterval)") \ 1661 \ 1662 notproduct(bool, GCALotAtAllSafepoints, false, \ 1663 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1664 \ 1665 product(bool, HandlePromotionFailure, true, \ 1666 "The youngest generation collection does not require" \ 1667 " a guarantee of full promotion of all live objects.") \ 1668 \ 1669 notproduct(bool, PromotionFailureALot, false, \ 1670 "Use promotion failure handling on every youngest generation " \ 1671 "collection") \ 1672 \ 1673 develop(uintx, PromotionFailureALotCount, 1000, \ 1674 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1675 "refill attempts (ParNew) or promotion attempts " \ 1676 "(other young collectors) ") \ 1677 \ 1678 develop(uintx, PromotionFailureALotInterval, 5, \ 1679 "Total collections between promotion failures alot") \ 1680 \ 1681 develop(intx, WorkStealingSleepMillis, 1, \ 1682 "Sleep time when sleep is used for yields") \ 1683 \ 1684 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1685 "Number of yields before a sleep is done during workstealing") \ 1686 \ 1687 develop(uintx, WorkStealingHardSpins, 4096, \ 1688 "Number of iterations in a spin loop between checks on " \ 1689 "time out of hard spin") \ 1690 \ 1691 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1692 "Ratio of hard spins to calls to yield") \ 1693 \ 1694 product(uintx, PreserveMarkStackSize, 1024, \ 1695 "Size for stack used in promotion failure handling") \ 1696 \ 1697 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1698 \ 1699 product_pd(bool, ResizeTLAB, \ 1700 "Dynamically resize tlab size for threads") \ 1701 \ 1702 product(bool, ZeroTLAB, false, \ 1703 "Zero out the newly created TLAB") \ 1704 \ 1705 product(bool, FastTLABRefill, true, \ 1706 "Use fast TLAB refill code") \ 1707 \ 1708 product(bool, PrintTLAB, false, \ 1709 "Print various TLAB related information") \ 1710 \ 1711 product(bool, TLABStats, true, \ 1712 "Print various TLAB related information") \ 1713 \ 1714 product(bool, PrintRevisitStats, false, \ 1715 "Print revisit (klass and MDO) stack related information") \ 1716 \ 1717 product_pd(bool, NeverActAsServerClassMachine, \ 1718 "Never act like a server-class machine") \ 1719 \ 1720 product(bool, AlwaysActAsServerClassMachine, false, \ 1721 "Always act like a server-class machine") \ 1722 \ 1723 product_pd(uintx, DefaultMaxRAM, \ 1724 "Maximum real memory size for setting server class heap size") \ 1725 \ 1726 product(uintx, DefaultMaxRAMFraction, 4, \ 1727 "Fraction (1/n) of real memory used for server class max heap") \ 1728 \ 1729 product(uintx, DefaultInitialRAMFraction, 64, \ 1730 "Fraction (1/n) of real memory used for server class initial heap") \ 1731 \ 1732 product(bool, UseAutoGCSelectPolicy, false, \ 1733 "Use automatic collection selection policy") \ 1734 \ 1735 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1736 "Automatic GC selection pause threshhold in ms") \ 1737 \ 1738 product(bool, UseAdaptiveSizePolicy, true, \ 1739 "Use adaptive generation sizing policies") \ 1740 \ 1741 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1742 "Use adaptive survivor sizing policies") \ 1743 \ 1744 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1745 "Use adaptive young-old sizing policies at minor collections") \ 1746 \ 1747 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1748 "Use adaptive young-old sizing policies at major collections") \ 1749 \ 1750 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1751 "Use statistics from System.GC for adaptive size policy") \ 1752 \ 1753 product(bool, UseAdaptiveGCBoundary, false, \ 1754 "Allow young-old boundary to move") \ 1755 \ 1756 develop(bool, TraceAdaptiveGCBoundary, false, \ 1757 "Trace young-old boundary moves") \ 1758 \ 1759 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1760 "Resize the virtual spaces of the young or old generations") \ 1761 \ 1762 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1763 "Policy for changeing generation size for throughput goals") \ 1764 \ 1765 product(uintx, AdaptiveSizePausePolicy, 0, \ 1766 "Policy for changing generation size for pause goals") \ 1767 \ 1768 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1769 "Adjust tenured generation to achive a minor pause goal") \ 1770 \ 1771 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1772 "Adjust young generation to achive a major pause goal") \ 1773 \ 1774 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1775 "Number of steps where heuristics is used before data is used") \ 1776 \ 1777 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1778 "Number of collections before the adaptive sizing is started") \ 1779 \ 1780 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1781 "Collecton interval for printing information, zero => never") \ 1782 \ 1783 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1784 "Use adaptive minimum footprint as a goal") \ 1785 \ 1786 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1787 "Weight given to exponential resizing, between 0 and 100") \ 1788 \ 1789 product(uintx, AdaptiveTimeWeight, 25, \ 1790 "Weight given to time in adaptive policy, between 0 and 100") \ 1791 \ 1792 product(uintx, PausePadding, 1, \ 1793 "How much buffer to keep for pause time") \ 1794 \ 1795 product(uintx, PromotedPadding, 3, \ 1796 "How much buffer to keep for promotion failure") \ 1797 \ 1798 product(uintx, SurvivorPadding, 3, \ 1799 "How much buffer to keep for survivor overflow") \ 1800 \ 1801 product(uintx, AdaptivePermSizeWeight, 20, \ 1802 "Weight for perm gen exponential resizing, between 0 and 100") \ 1803 \ 1804 product(uintx, PermGenPadding, 3, \ 1805 "How much buffer to keep for perm gen sizing") \ 1806 \ 1807 product(uintx, ThresholdTolerance, 10, \ 1808 "Allowed collection cost difference between generations") \ 1809 \ 1810 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1811 "If collection costs are within margin, reduce both by full delta") \ 1812 \ 1813 product(uintx, YoungGenerationSizeIncrement, 20, \ 1814 "Adaptive size percentage change in young generation") \ 1815 \ 1816 product(uintx, YoungGenerationSizeSupplement, 80, \ 1817 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1818 \ 1819 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1820 "Decay factor to YoungedGenerationSizeSupplement") \ 1821 \ 1822 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1823 "Adaptive size percentage change in tenured generation") \ 1824 \ 1825 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1826 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1827 \ 1828 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1829 "Decay factor to TenuredGenerationSizeIncrement") \ 1830 \ 1831 product(uintx, MaxGCPauseMillis, max_uintx, \ 1832 "Adaptive size policy maximum GC pause time goal in msec, " \ 1833 "or (G1 Only) the max. GC time per MMU time slice") \ 1834 \ 1835 product(intx, GCPauseIntervalMillis, 500, \ 1836 "Time slice for MMU specification") \ 1837 \ 1838 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1839 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1840 \ 1841 product(uintx, GCTimeRatio, 99, \ 1842 "Adaptive size policy application time to GC time ratio") \ 1843 \ 1844 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1845 "Adaptive size scale down factor for shrinking") \ 1846 \ 1847 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1848 "Adaptive size decays the major cost for long major intervals") \ 1849 \ 1850 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1851 "Time scale over which major costs decay") \ 1852 \ 1853 product(uintx, MinSurvivorRatio, 3, \ 1854 "Minimum ratio of young generation/survivor space size") \ 1855 \ 1856 product(uintx, InitialSurvivorRatio, 8, \ 1857 "Initial ratio of eden/survivor space size") \ 1858 \ 1859 product(uintx, BaseFootPrintEstimate, 256*M, \ 1860 "Estimate of footprint other than Java Heap") \ 1861 \ 1862 product(bool, UseGCOverheadLimit, true, \ 1863 "Use policy to limit of proportion of time spent in GC " \ 1864 "before an OutOfMemory error is thrown") \ 1865 \ 1866 product(uintx, GCTimeLimit, 98, \ 1867 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1868 "error is thrown (used with GCHeapFreeLimit)") \ 1869 \ 1870 product(uintx, GCHeapFreeLimit, 2, \ 1871 "Minimum percentage of free space after a full GC before an " \ 1872 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1873 \ 1874 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 1875 "Number of consecutive collections before gc time limit fires") \ 1876 \ 1877 product(bool, PrintAdaptiveSizePolicy, false, \ 1878 "Print information about AdaptiveSizePolicy") \ 1879 \ 1880 product(intx, PrefetchCopyIntervalInBytes, -1, \ 1881 "How far ahead to prefetch destination area (<= 0 means off)") \ 1882 \ 1883 product(intx, PrefetchScanIntervalInBytes, -1, \ 1884 "How far ahead to prefetch scan area (<= 0 means off)") \ 1885 \ 1886 product(intx, PrefetchFieldsAhead, -1, \ 1887 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 1888 \ 1889 develop(bool, UsePrefetchQueue, true, \ 1890 "Use the prefetch queue during PS promotion") \ 1891 \ 1892 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 1893 "Verify system before exiting") \ 1894 \ 1895 diagnostic(bool, VerifyBeforeGC, false, \ 1896 "Verify memory system before GC") \ 1897 \ 1898 diagnostic(bool, VerifyAfterGC, false, \ 1899 "Verify memory system after GC") \ 1900 \ 1901 diagnostic(bool, VerifyDuringGC, false, \ 1902 "Verify memory system during GC (between phases)") \ 1903 \ 1904 diagnostic(bool, GCParallelVerificationEnabled, true, \ 1905 "Enable parallel memory system verification") \ 1906 \ 1907 diagnostic(bool, VerifyRememberedSets, false, \ 1908 "Verify GC remembered sets") \ 1909 \ 1910 diagnostic(bool, VerifyObjectStartArray, true, \ 1911 "Verify GC object start array if verify before/after") \ 1912 \ 1913 product(bool, DisableExplicitGC, false, \ 1914 "Tells whether calling System.gc() does a full GC") \ 1915 \ 1916 notproduct(bool, CheckMemoryInitialization, false, \ 1917 "Checks memory initialization") \ 1918 \ 1919 product(bool, CollectGen0First, false, \ 1920 "Collect youngest generation before each full GC") \ 1921 \ 1922 diagnostic(bool, BindCMSThreadToCPU, false, \ 1923 "Bind CMS Thread to CPU if possible") \ 1924 \ 1925 diagnostic(uintx, CPUForCMSThread, 0, \ 1926 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 1927 \ 1928 product(bool, BindGCTaskThreadsToCPUs, false, \ 1929 "Bind GCTaskThreads to CPUs if possible") \ 1930 \ 1931 product(bool, UseGCTaskAffinity, false, \ 1932 "Use worker affinity when asking for GCTasks") \ 1933 \ 1934 product(uintx, ProcessDistributionStride, 4, \ 1935 "Stride through processors when distributing processes") \ 1936 \ 1937 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 1938 "number of times the coordinator GC thread will sleep while " \ 1939 "yielding before giving up and resuming GC") \ 1940 \ 1941 product(uintx, CMSYieldSleepCount, 0, \ 1942 "number of times a GC thread (minus the coordinator) " \ 1943 "will sleep while yielding before giving up and resuming GC") \ 1944 \ 1945 notproduct(bool, PrintFlagsFinal, false, \ 1946 "Print all command line flags after argument processing") \ 1947 \ 1948 /* gc tracing */ \ 1949 manageable(bool, PrintGC, false, \ 1950 "Print message at garbage collect") \ 1951 \ 1952 manageable(bool, PrintGCDetails, false, \ 1953 "Print more details at garbage collect") \ 1954 \ 1955 manageable(bool, PrintGCDateStamps, false, \ 1956 "Print date stamps at garbage collect") \ 1957 \ 1958 manageable(bool, PrintGCTimeStamps, false, \ 1959 "Print timestamps at garbage collect") \ 1960 \ 1961 product(bool, PrintGCTaskTimeStamps, false, \ 1962 "Print timestamps for individual gc worker thread tasks") \ 1963 \ 1964 develop(intx, ConcGCYieldTimeout, 0, \ 1965 "If non-zero, assert that GC threads yield within this # of ms.") \ 1966 \ 1967 notproduct(bool, TraceMarkSweep, false, \ 1968 "Trace mark sweep") \ 1969 \ 1970 product(bool, PrintReferenceGC, false, \ 1971 "Print times spent handling reference objects during GC " \ 1972 " (enabled only when PrintGCDetails)") \ 1973 \ 1974 develop(bool, TraceReferenceGC, false, \ 1975 "Trace handling of soft/weak/final/phantom references") \ 1976 \ 1977 develop(bool, TraceFinalizerRegistration, false, \ 1978 "Trace registration of final references") \ 1979 \ 1980 notproduct(bool, TraceScavenge, false, \ 1981 "Trace scavenge") \ 1982 \ 1983 product_rw(bool, TraceClassLoading, false, \ 1984 "Trace all classes loaded") \ 1985 \ 1986 product(bool, TraceClassLoadingPreorder, false, \ 1987 "Trace all classes loaded in order referenced (not loaded)") \ 1988 \ 1989 product_rw(bool, TraceClassUnloading, false, \ 1990 "Trace unloading of classes") \ 1991 \ 1992 product_rw(bool, TraceLoaderConstraints, false, \ 1993 "Trace loader constraints") \ 1994 \ 1995 product(bool, TraceGen0Time, false, \ 1996 "Trace accumulated time for Gen 0 collection") \ 1997 \ 1998 product(bool, TraceGen1Time, false, \ 1999 "Trace accumulated time for Gen 1 collection") \ 2000 \ 2001 product(bool, PrintTenuringDistribution, false, \ 2002 "Print tenuring age information") \ 2003 \ 2004 product_rw(bool, PrintHeapAtGC, false, \ 2005 "Print heap layout before and after each GC") \ 2006 \ 2007 product_rw(bool, PrintHeapAtGCExtended, false, \ 2008 "Prints extended information about the layout of the heap " \ 2009 "when -XX:+PrintHeapAtGC is set") \ 2010 \ 2011 product(bool, PrintHeapAtSIGBREAK, true, \ 2012 "Print heap layout in response to SIGBREAK") \ 2013 \ 2014 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2015 "Print a class histogram before any major stop-world GC") \ 2016 \ 2017 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2018 "Print a class histogram after any major stop-world GC") \ 2019 \ 2020 manageable(bool, PrintClassHistogram, false, \ 2021 "Print a histogram of class instances") \ 2022 \ 2023 develop(bool, TraceWorkGang, false, \ 2024 "Trace activities of work gangs") \ 2025 \ 2026 product(bool, TraceParallelOldGCTasks, false, \ 2027 "Trace multithreaded GC activity") \ 2028 \ 2029 develop(bool, TraceBlockOffsetTable, false, \ 2030 "Print BlockOffsetTable maps") \ 2031 \ 2032 develop(bool, TraceCardTableModRefBS, false, \ 2033 "Print CardTableModRefBS maps") \ 2034 \ 2035 develop(bool, TraceGCTaskManager, false, \ 2036 "Trace actions of the GC task manager") \ 2037 \ 2038 develop(bool, TraceGCTaskQueue, false, \ 2039 "Trace actions of the GC task queues") \ 2040 \ 2041 develop(bool, TraceGCTaskThread, false, \ 2042 "Trace actions of the GC task threads") \ 2043 \ 2044 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2045 "Print the time taken by each parallel old gc phase." \ 2046 "PrintGCDetails must also be enabled.") \ 2047 \ 2048 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2049 "Trace parallel old gc marking phase") \ 2050 \ 2051 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2052 "Trace parallel old gc summary phase") \ 2053 \ 2054 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2055 "Trace parallel old gc compaction phase") \ 2056 \ 2057 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2058 "Trace parallel old gc dense prefix computation") \ 2059 \ 2060 develop(bool, IgnoreLibthreadGPFault, false, \ 2061 "Suppress workaround for libthread GP fault") \ 2062 \ 2063 product(bool, PrintJNIGCStalls, false, \ 2064 "Print diagnostic message when GC is stalled" \ 2065 "by JNI critical section") \ 2066 \ 2067 /* JVMTI heap profiling */ \ 2068 \ 2069 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2070 "Trace JVMTI object tagging calls") \ 2071 \ 2072 diagnostic(bool, VerifyBeforeIteration, false, \ 2073 "Verify memory system before JVMTI iteration") \ 2074 \ 2075 /* compiler interface */ \ 2076 \ 2077 develop(bool, CIPrintCompilerName, false, \ 2078 "when CIPrint is active, print the name of the active compiler") \ 2079 \ 2080 develop(bool, CIPrintCompileQueue, false, \ 2081 "display the contents of the compile queue whenever a " \ 2082 "compilation is enqueued") \ 2083 \ 2084 develop(bool, CIPrintRequests, false, \ 2085 "display every request for compilation") \ 2086 \ 2087 product(bool, CITime, false, \ 2088 "collect timing information for compilation") \ 2089 \ 2090 develop(bool, CITimeEach, false, \ 2091 "display timing information after each successful compilation") \ 2092 \ 2093 develop(bool, CICountOSR, true, \ 2094 "use a separate counter when assigning ids to osr compilations") \ 2095 \ 2096 develop(bool, CICompileNatives, true, \ 2097 "compile native methods if supported by the compiler") \ 2098 \ 2099 develop_pd(bool, CICompileOSR, \ 2100 "compile on stack replacement methods if supported by the " \ 2101 "compiler") \ 2102 \ 2103 develop(bool, CIPrintMethodCodes, false, \ 2104 "print method bytecodes of the compiled code") \ 2105 \ 2106 develop(bool, CIPrintTypeFlow, false, \ 2107 "print the results of ciTypeFlow analysis") \ 2108 \ 2109 develop(bool, CITraceTypeFlow, false, \ 2110 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2111 \ 2112 develop(intx, CICloneLoopTestLimit, 100, \ 2113 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2114 \ 2115 /* temp diagnostics */ \ 2116 \ 2117 diagnostic(bool, TraceRedundantCompiles, false, \ 2118 "Have compile broker print when a request already in the queue is"\ 2119 " requested again") \ 2120 \ 2121 diagnostic(bool, InitialCompileFast, false, \ 2122 "Initial compile at CompLevel_fast_compile") \ 2123 \ 2124 diagnostic(bool, InitialCompileReallyFast, false, \ 2125 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2126 \ 2127 diagnostic(bool, FullProfileOnReInterpret, true, \ 2128 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2129 \ 2130 /* compiler */ \ 2131 \ 2132 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2133 "Number of compiler threads to run") \ 2134 \ 2135 product(intx, CompilationPolicyChoice, 0, \ 2136 "which compilation policy (0/1)") \ 2137 \ 2138 develop(bool, UseStackBanging, true, \ 2139 "use stack banging for stack overflow checks (required for " \ 2140 "proper StackOverflow handling; disable only to measure cost " \ 2141 "of stackbanging)") \ 2142 \ 2143 develop(bool, Use24BitFPMode, true, \ 2144 "Set 24-bit FPU mode on a per-compile basis ") \ 2145 \ 2146 develop(bool, Use24BitFP, true, \ 2147 "use FP instructions that produce 24-bit precise results") \ 2148 \ 2149 develop(bool, UseStrictFP, true, \ 2150 "use strict fp if modifier strictfp is set") \ 2151 \ 2152 develop(bool, GenerateSynchronizationCode, true, \ 2153 "generate locking/unlocking code for synchronized methods and " \ 2154 "monitors") \ 2155 \ 2156 develop(bool, GenerateCompilerNullChecks, true, \ 2157 "Generate explicit null checks for loads/stores/calls") \ 2158 \ 2159 develop(bool, GenerateRangeChecks, true, \ 2160 "Generate range checks for array accesses") \ 2161 \ 2162 develop_pd(bool, ImplicitNullChecks, \ 2163 "generate code for implicit null checks") \ 2164 \ 2165 product(bool, PrintSafepointStatistics, false, \ 2166 "print statistics about safepoint synchronization") \ 2167 \ 2168 product(intx, PrintSafepointStatisticsCount, 300, \ 2169 "total number of safepoint statistics collected " \ 2170 "before printing them out") \ 2171 \ 2172 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2173 "print safepoint statistics only when safepoint takes" \ 2174 " more than PrintSafepointSatisticsTimeout in millis") \ 2175 \ 2176 develop(bool, InlineAccessors, true, \ 2177 "inline accessor methods (get/set)") \ 2178 \ 2179 product(bool, Inline, true, \ 2180 "enable inlining") \ 2181 \ 2182 product(bool, ClipInlining, true, \ 2183 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2184 \ 2185 develop(bool, UseCHA, true, \ 2186 "enable CHA") \ 2187 \ 2188 product(bool, UseTypeProfile, true, \ 2189 "Check interpreter profile for historically monomorphic calls") \ 2190 \ 2191 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2192 "% of major receiver type to all profiled receivers") \ 2193 \ 2194 notproduct(bool, TimeCompiler, false, \ 2195 "time the compiler") \ 2196 \ 2197 notproduct(bool, TimeCompiler2, false, \ 2198 "detailed time the compiler (requires +TimeCompiler)") \ 2199 \ 2200 diagnostic(bool, PrintInlining, false, \ 2201 "prints inlining optimizations") \ 2202 \ 2203 diagnostic(bool, PrintIntrinsics, false, \ 2204 "prints attempted and successful inlining of intrinsics") \ 2205 \ 2206 product(bool, UseCountLeadingZerosInstruction, false, \ 2207 "Use count leading zeros instruction") \ 2208 \ 2209 product(bool, UsePopCountInstruction, false, \ 2210 "Use population count instruction") \ 2211 \ 2212 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2213 "do not expand intrinsics whose (internal) names appear here") \ 2214 \ 2215 develop(bool, StressReflectiveCode, false, \ 2216 "Use inexact types at allocations, etc., to test reflection") \ 2217 \ 2218 develop(bool, EagerInitialization, false, \ 2219 "Eagerly initialize classes if possible") \ 2220 \ 2221 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2222 "Update methodDataOops in Tier1-generated code") \ 2223 \ 2224 develop(bool, TraceMethodReplacement, false, \ 2225 "Print when methods are replaced do to recompilation") \ 2226 \ 2227 develop(bool, PrintMethodFlushing, false, \ 2228 "print the nmethods being flushed") \ 2229 \ 2230 notproduct(bool, LogMultipleMutexLocking, false, \ 2231 "log locking and unlocking of mutexes (only if multiple locks " \ 2232 "are held)") \ 2233 \ 2234 develop(bool, UseRelocIndex, false, \ 2235 "use an index to speed random access to relocations") \ 2236 \ 2237 develop(bool, StressCodeBuffers, false, \ 2238 "Exercise code buffer expansion and other rare state changes") \ 2239 \ 2240 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2241 "Generate extra debugging info for non-safepoints in nmethods") \ 2242 \ 2243 diagnostic(bool, DebugInlinedCalls, true, \ 2244 "If false, restricts profiled locations to the root method only") \ 2245 \ 2246 product(bool, PrintVMOptions, trueInDebug, \ 2247 "print VM flag settings") \ 2248 \ 2249 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2250 "Ignore unrecognized VM options") \ 2251 \ 2252 diagnostic(bool, SerializeVMOutput, true, \ 2253 "Use a mutex to serialize output to tty and hotspot.log") \ 2254 \ 2255 diagnostic(bool, DisplayVMOutput, true, \ 2256 "Display all VM output on the tty, independently of LogVMOutput") \ 2257 \ 2258 diagnostic(bool, LogVMOutput, trueInDebug, \ 2259 "Save VM output to hotspot.log, or to LogFile") \ 2260 \ 2261 diagnostic(ccstr, LogFile, NULL, \ 2262 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2263 \ 2264 product(ccstr, ErrorFile, NULL, \ 2265 "If an error occurs, save the error data to this file " \ 2266 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2267 \ 2268 product(bool, DisplayVMOutputToStderr, false, \ 2269 "If DisplayVMOutput is true, display all VM output to stderr") \ 2270 \ 2271 product(bool, DisplayVMOutputToStdout, false, \ 2272 "If DisplayVMOutput is true, display all VM output to stdout") \ 2273 \ 2274 product(bool, UseHeavyMonitors, false, \ 2275 "use heavyweight instead of lightweight Java monitors") \ 2276 \ 2277 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2278 "print histogram of the symbol table") \ 2279 \ 2280 notproduct(bool, ExitVMOnVerifyError, false, \ 2281 "standard exit from VM if bytecode verify error " \ 2282 "(only in debug mode)") \ 2283 \ 2284 notproduct(ccstr, AbortVMOnException, NULL, \ 2285 "Call fatal if this exception is thrown. Example: " \ 2286 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2287 \ 2288 develop(bool, DebugVtables, false, \ 2289 "add debugging code to vtable dispatch") \ 2290 \ 2291 develop(bool, PrintVtables, false, \ 2292 "print vtables when printing klass") \ 2293 \ 2294 notproduct(bool, PrintVtableStats, false, \ 2295 "print vtables stats at end of run") \ 2296 \ 2297 develop(bool, TraceCreateZombies, false, \ 2298 "trace creation of zombie nmethods") \ 2299 \ 2300 notproduct(bool, IgnoreLockingAssertions, false, \ 2301 "disable locking assertions (for speed)") \ 2302 \ 2303 notproduct(bool, VerifyLoopOptimizations, false, \ 2304 "verify major loop optimizations") \ 2305 \ 2306 product(bool, RangeCheckElimination, true, \ 2307 "Split loop iterations to eliminate range checks") \ 2308 \ 2309 develop_pd(bool, UncommonNullCast, \ 2310 "track occurrences of null in casts; adjust compiler tactics") \ 2311 \ 2312 develop(bool, TypeProfileCasts, true, \ 2313 "treat casts like calls for purposes of type profiling") \ 2314 \ 2315 develop(bool, MonomorphicArrayCheck, true, \ 2316 "Uncommon-trap array store checks that require full type check") \ 2317 \ 2318 develop(bool, DelayCompilationDuringStartup, true, \ 2319 "Delay invoking the compiler until main application class is " \ 2320 "loaded") \ 2321 \ 2322 develop(bool, CompileTheWorld, false, \ 2323 "Compile all methods in all classes in bootstrap class path " \ 2324 "(stress test)") \ 2325 \ 2326 develop(bool, CompileTheWorldPreloadClasses, true, \ 2327 "Preload all classes used by a class before start loading") \ 2328 \ 2329 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2330 "Compile all methods although class initializer failed") \ 2331 \ 2332 develop(bool, TraceIterativeGVN, false, \ 2333 "Print progress during Iterative Global Value Numbering") \ 2334 \ 2335 develop(bool, FillDelaySlots, true, \ 2336 "Fill delay slots (on SPARC only)") \ 2337 \ 2338 develop(bool, VerifyIterativeGVN, false, \ 2339 "Verify Def-Use modifications during sparse Iterative Global " \ 2340 "Value Numbering") \ 2341 \ 2342 notproduct(bool, TracePhaseCCP, false, \ 2343 "Print progress during Conditional Constant Propagation") \ 2344 \ 2345 develop(bool, TimeLivenessAnalysis, false, \ 2346 "Time computation of bytecode liveness analysis") \ 2347 \ 2348 develop(bool, TraceLivenessGen, false, \ 2349 "Trace the generation of liveness analysis information") \ 2350 \ 2351 notproduct(bool, TraceLivenessQuery, false, \ 2352 "Trace queries of liveness analysis information") \ 2353 \ 2354 notproduct(bool, CollectIndexSetStatistics, false, \ 2355 "Collect information about IndexSets") \ 2356 \ 2357 develop(bool, PrintDominators, false, \ 2358 "Print out dominator trees for GVN") \ 2359 \ 2360 develop(bool, UseLoopSafepoints, true, \ 2361 "Generate Safepoint nodes in every loop") \ 2362 \ 2363 notproduct(bool, TraceCISCSpill, false, \ 2364 "Trace allocators use of cisc spillable instructions") \ 2365 \ 2366 notproduct(bool, TraceSpilling, false, \ 2367 "Trace spilling") \ 2368 \ 2369 develop(bool, DeutschShiffmanExceptions, true, \ 2370 "Fast check to find exception handler for precisely typed " \ 2371 "exceptions") \ 2372 \ 2373 product(bool, SplitIfBlocks, true, \ 2374 "Clone compares and control flow through merge points to fold " \ 2375 "some branches") \ 2376 \ 2377 develop(intx, FastAllocateSizeLimit, 128*K, \ 2378 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2379 "Inline allocations larger than this in doublewords must go slow")\ 2380 \ 2381 product(bool, AggressiveOpts, false, \ 2382 "Enable aggressive optimizations - see arguments.cpp") \ 2383 \ 2384 product(bool, UseStringCache, false, \ 2385 "Enable String cache capabilities on String.java") \ 2386 \ 2387 /* statistics */ \ 2388 develop(bool, UseVTune, false, \ 2389 "enable support for Intel's VTune profiler") \ 2390 \ 2391 develop(bool, CountCompiledCalls, false, \ 2392 "counts method invocations") \ 2393 \ 2394 notproduct(bool, CountRuntimeCalls, false, \ 2395 "counts VM runtime calls") \ 2396 \ 2397 develop(bool, CountJNICalls, false, \ 2398 "counts jni method invocations") \ 2399 \ 2400 notproduct(bool, CountJVMCalls, false, \ 2401 "counts jvm method invocations") \ 2402 \ 2403 notproduct(bool, CountRemovableExceptions, false, \ 2404 "count exceptions that could be replaced by branches due to " \ 2405 "inlining") \ 2406 \ 2407 notproduct(bool, ICMissHistogram, false, \ 2408 "produce histogram of IC misses") \ 2409 \ 2410 notproduct(bool, PrintClassStatistics, false, \ 2411 "prints class statistics at end of run") \ 2412 \ 2413 notproduct(bool, PrintMethodStatistics, false, \ 2414 "prints method statistics at end of run") \ 2415 \ 2416 /* interpreter */ \ 2417 develop(bool, ClearInterpreterLocals, false, \ 2418 "Always clear local variables of interpreter activations upon " \ 2419 "entry") \ 2420 \ 2421 product_pd(bool, RewriteBytecodes, \ 2422 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2423 \ 2424 product_pd(bool, RewriteFrequentPairs, \ 2425 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2426 \ 2427 diagnostic(bool, PrintInterpreter, false, \ 2428 "Prints the generated interpreter code") \ 2429 \ 2430 product(bool, UseInterpreter, true, \ 2431 "Use interpreter for non-compiled methods") \ 2432 \ 2433 develop(bool, UseFastSignatureHandlers, true, \ 2434 "Use fast signature handlers for native calls") \ 2435 \ 2436 develop(bool, UseV8InstrsOnly, false, \ 2437 "Use SPARC-V8 Compliant instruction subset") \ 2438 \ 2439 product(bool, UseNiagaraInstrs, false, \ 2440 "Use Niagara-efficient instruction subset") \ 2441 \ 2442 develop(bool, UseCASForSwap, false, \ 2443 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2444 \ 2445 product(bool, UseLoopCounter, true, \ 2446 "Increment invocation counter on backward branch") \ 2447 \ 2448 product(bool, UseFastEmptyMethods, true, \ 2449 "Use fast method entry code for empty methods") \ 2450 \ 2451 product(bool, UseFastAccessorMethods, true, \ 2452 "Use fast method entry code for accessor methods") \ 2453 \ 2454 product_pd(bool, UseOnStackReplacement, \ 2455 "Use on stack replacement, calls runtime if invoc. counter " \ 2456 "overflows in loop") \ 2457 \ 2458 notproduct(bool, TraceOnStackReplacement, false, \ 2459 "Trace on stack replacement") \ 2460 \ 2461 develop(bool, PoisonOSREntry, true, \ 2462 "Detect abnormal calls to OSR code") \ 2463 \ 2464 product_pd(bool, PreferInterpreterNativeStubs, \ 2465 "Use always interpreter stubs for native methods invoked via " \ 2466 "interpreter") \ 2467 \ 2468 develop(bool, CountBytecodes, false, \ 2469 "Count number of bytecodes executed") \ 2470 \ 2471 develop(bool, PrintBytecodeHistogram, false, \ 2472 "Print histogram of the executed bytecodes") \ 2473 \ 2474 develop(bool, PrintBytecodePairHistogram, false, \ 2475 "Print histogram of the executed bytecode pairs") \ 2476 \ 2477 diagnostic(bool, PrintSignatureHandlers, false, \ 2478 "Print code generated for native method signature handlers") \ 2479 \ 2480 develop(bool, VerifyOops, false, \ 2481 "Do plausibility checks for oops") \ 2482 \ 2483 develop(bool, CheckUnhandledOops, false, \ 2484 "Check for unhandled oops in VM code") \ 2485 \ 2486 develop(bool, VerifyJNIFields, trueInDebug, \ 2487 "Verify jfieldIDs for instance fields") \ 2488 \ 2489 notproduct(bool, VerifyJNIEnvThread, false, \ 2490 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2491 "from JNI") \ 2492 \ 2493 develop(bool, VerifyFPU, false, \ 2494 "Verify FPU state (check for NaN's, etc.)") \ 2495 \ 2496 develop(bool, VerifyThread, false, \ 2497 "Watch the thread register for corruption (SPARC only)") \ 2498 \ 2499 develop(bool, VerifyActivationFrameSize, false, \ 2500 "Verify that activation frame didn't become smaller than its " \ 2501 "minimal size") \ 2502 \ 2503 develop(bool, TraceFrequencyInlining, false, \ 2504 "Trace frequency based inlining") \ 2505 \ 2506 notproduct(bool, TraceTypeProfile, false, \ 2507 "Trace type profile") \ 2508 \ 2509 develop_pd(bool, InlineIntrinsics, \ 2510 "Inline intrinsics that can be statically resolved") \ 2511 \ 2512 product_pd(bool, ProfileInterpreter, \ 2513 "Profile at the bytecode level during interpretation") \ 2514 \ 2515 develop_pd(bool, ProfileTraps, \ 2516 "Profile deoptimization traps at the bytecode level") \ 2517 \ 2518 product(intx, ProfileMaturityPercentage, 20, \ 2519 "number of method invocations/branches (expressed as % of " \ 2520 "CompileThreshold) before using the method's profile") \ 2521 \ 2522 develop(bool, PrintMethodData, false, \ 2523 "Print the results of +ProfileInterpreter at end of run") \ 2524 \ 2525 develop(bool, VerifyDataPointer, trueInDebug, \ 2526 "Verify the method data pointer during interpreter profiling") \ 2527 \ 2528 develop(bool, VerifyCompiledCode, false, \ 2529 "Include miscellaneous runtime verifications in nmethod code; " \ 2530 "off by default because it disturbs nmethod size heuristics.") \ 2531 \ 2532 \ 2533 /* compilation */ \ 2534 product(bool, UseCompiler, true, \ 2535 "use compilation") \ 2536 \ 2537 develop(bool, TraceCompilationPolicy, false, \ 2538 "Trace compilation policy") \ 2539 \ 2540 develop(bool, TimeCompilationPolicy, false, \ 2541 "Time the compilation policy") \ 2542 \ 2543 product(bool, UseCounterDecay, true, \ 2544 "adjust recompilation counters") \ 2545 \ 2546 develop(intx, CounterHalfLifeTime, 30, \ 2547 "half-life time of invocation counters (in secs)") \ 2548 \ 2549 develop(intx, CounterDecayMinIntervalLength, 500, \ 2550 "Min. ms. between invocation of CounterDecay") \ 2551 \ 2552 product(bool, AlwaysCompileLoopMethods, false, \ 2553 "when using recompilation, never interpret methods " \ 2554 "containing loops") \ 2555 \ 2556 product(bool, DontCompileHugeMethods, true, \ 2557 "don't compile methods > HugeMethodLimit") \ 2558 \ 2559 /* Bytecode escape analysis estimation. */ \ 2560 product(bool, EstimateArgEscape, true, \ 2561 "Analyze bytecodes to estimate escape state of arguments") \ 2562 \ 2563 product(intx, BCEATraceLevel, 0, \ 2564 "How much tracing to do of bytecode escape analysis estimates") \ 2565 \ 2566 product(intx, MaxBCEAEstimateLevel, 5, \ 2567 "Maximum number of nested calls that are analyzed by BC EA.") \ 2568 \ 2569 product(intx, MaxBCEAEstimateSize, 150, \ 2570 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2571 \ 2572 product(intx, AllocatePrefetchStyle, 1, \ 2573 "0 = no prefetch, " \ 2574 "1 = prefetch instructions for each allocation, " \ 2575 "2 = use TLAB watermark to gate allocation prefetch") \ 2576 \ 2577 product(intx, AllocatePrefetchDistance, -1, \ 2578 "Distance to prefetch ahead of allocation pointer") \ 2579 \ 2580 product(intx, AllocatePrefetchLines, 1, \ 2581 "Number of lines to prefetch ahead of allocation pointer") \ 2582 \ 2583 product(intx, AllocatePrefetchStepSize, 16, \ 2584 "Step size in bytes of sequential prefetch instructions") \ 2585 \ 2586 product(intx, AllocatePrefetchInstr, 0, \ 2587 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2588 \ 2589 product(intx, ReadPrefetchInstr, 0, \ 2590 "Prefetch instruction to prefetch ahead") \ 2591 \ 2592 /* deoptimization */ \ 2593 develop(bool, TraceDeoptimization, false, \ 2594 "Trace deoptimization") \ 2595 \ 2596 develop(bool, DebugDeoptimization, false, \ 2597 "Tracing various information while debugging deoptimization") \ 2598 \ 2599 product(intx, SelfDestructTimer, 0, \ 2600 "Will cause VM to terminate after a given time (in minutes) " \ 2601 "(0 means off)") \ 2602 \ 2603 product(intx, MaxJavaStackTraceDepth, 1024, \ 2604 "Max. no. of lines in the stack trace for Java exceptions " \ 2605 "(0 means all)") \ 2606 \ 2607 develop(intx, GuaranteedSafepointInterval, 1000, \ 2608 "Guarantee a safepoint (at least) every so many milliseconds " \ 2609 "(0 means none)") \ 2610 \ 2611 product(intx, SafepointTimeoutDelay, 10000, \ 2612 "Delay in milliseconds for option SafepointTimeout") \ 2613 \ 2614 product(intx, NmethodSweepFraction, 4, \ 2615 "Number of invocations of sweeper to cover all nmethods") \ 2616 \ 2617 notproduct(intx, MemProfilingInterval, 500, \ 2618 "Time between each invocation of the MemProfiler") \ 2619 \ 2620 develop(intx, MallocCatchPtr, -1, \ 2621 "Hit breakpoint when mallocing/freeing this pointer") \ 2622 \ 2623 notproduct(intx, AssertRepeat, 1, \ 2624 "number of times to evaluate expression in assert " \ 2625 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2626 \ 2627 notproduct(ccstrlist, SuppressErrorAt, "", \ 2628 "List of assertions (file:line) to muzzle") \ 2629 \ 2630 notproduct(uintx, HandleAllocationLimit, 1024, \ 2631 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2632 "is used") \ 2633 \ 2634 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2635 "Threshold for total handle allocation when " \ 2636 "+TraceHandleAllocation is used") \ 2637 \ 2638 develop(intx, StackPrintLimit, 100, \ 2639 "number of stack frames to print in VM-level stack dump") \ 2640 \ 2641 notproduct(intx, MaxElementPrintSize, 256, \ 2642 "maximum number of elements to print") \ 2643 \ 2644 notproduct(intx, MaxSubklassPrintSize, 4, \ 2645 "maximum number of subklasses to print when printing klass") \ 2646 \ 2647 develop(intx, MaxInlineLevel, 9, \ 2648 "maximum number of nested calls that are inlined") \ 2649 \ 2650 develop(intx, MaxRecursiveInlineLevel, 1, \ 2651 "maximum number of nested recursive calls that are inlined") \ 2652 \ 2653 product_pd(intx, InlineSmallCode, \ 2654 "Only inline already compiled methods if their code size is " \ 2655 "less than this") \ 2656 \ 2657 product(intx, MaxInlineSize, 35, \ 2658 "maximum bytecode size of a method to be inlined") \ 2659 \ 2660 product_pd(intx, FreqInlineSize, \ 2661 "maximum bytecode size of a frequent method to be inlined") \ 2662 \ 2663 develop(intx, MaxTrivialSize, 6, \ 2664 "maximum bytecode size of a trivial method to be inlined") \ 2665 \ 2666 develop(intx, MinInliningThreshold, 250, \ 2667 "min. invocation count a method needs to have to be inlined") \ 2668 \ 2669 develop(intx, AlignEntryCode, 4, \ 2670 "aligns entry code to specified value (in bytes)") \ 2671 \ 2672 develop(intx, MethodHistogramCutoff, 100, \ 2673 "cutoff value for method invoc. histogram (+CountCalls)") \ 2674 \ 2675 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2676 "# of interpreted methods to show in profile") \ 2677 \ 2678 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2679 "# of compiled methods to show in profile") \ 2680 \ 2681 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2682 "# of stub methods to show in profile") \ 2683 \ 2684 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2685 "# of runtime stub nodes to show in profile") \ 2686 \ 2687 product(intx, ProfileIntervalsTicks, 100, \ 2688 "# of ticks between printing of interval profile " \ 2689 "(+ProfileIntervals)") \ 2690 \ 2691 notproduct(intx, ScavengeALotInterval, 1, \ 2692 "Interval between which scavenge will occur with +ScavengeALot") \ 2693 \ 2694 notproduct(intx, FullGCALotInterval, 1, \ 2695 "Interval between which full gc will occur with +FullGCALot") \ 2696 \ 2697 notproduct(intx, FullGCALotStart, 0, \ 2698 "For which invocation to start FullGCAlot") \ 2699 \ 2700 notproduct(intx, FullGCALotDummies, 32*K, \ 2701 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2702 "to move") \ 2703 \ 2704 develop(intx, DontYieldALotInterval, 10, \ 2705 "Interval between which yields will be dropped (milliseconds)") \ 2706 \ 2707 develop(intx, MinSleepInterval, 1, \ 2708 "Minimum sleep() interval (milliseconds) when " \ 2709 "ConvertSleepToYield is off (used for SOLARIS)") \ 2710 \ 2711 product(intx, EventLogLength, 2000, \ 2712 "maximum nof events in event log") \ 2713 \ 2714 develop(intx, ProfilerPCTickThreshold, 15, \ 2715 "Number of ticks in a PC buckets to be a hotspot") \ 2716 \ 2717 notproduct(intx, DeoptimizeALotInterval, 5, \ 2718 "Number of exits until DeoptimizeALot kicks in") \ 2719 \ 2720 notproduct(intx, ZombieALotInterval, 5, \ 2721 "Number of exits until ZombieALot kicks in") \ 2722 \ 2723 develop(bool, StressNonEntrant, false, \ 2724 "Mark nmethods non-entrant at registration") \ 2725 \ 2726 diagnostic(intx, MallocVerifyInterval, 0, \ 2727 "if non-zero, verify C heap after every N calls to " \ 2728 "malloc/realloc/free") \ 2729 \ 2730 diagnostic(intx, MallocVerifyStart, 0, \ 2731 "if non-zero, start verifying C heap after Nth call to " \ 2732 "malloc/realloc/free") \ 2733 \ 2734 product(intx, TypeProfileWidth, 2, \ 2735 "number of receiver types to record in call/cast profile") \ 2736 \ 2737 develop(intx, BciProfileWidth, 2, \ 2738 "number of return bci's to record in ret profile") \ 2739 \ 2740 product(intx, PerMethodRecompilationCutoff, 400, \ 2741 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2742 \ 2743 product(intx, PerBytecodeRecompilationCutoff, 100, \ 2744 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2745 \ 2746 product(intx, PerMethodTrapLimit, 100, \ 2747 "Limit on traps (of one kind) in a method (includes inlines)") \ 2748 \ 2749 product(intx, PerBytecodeTrapLimit, 4, \ 2750 "Limit on traps (of one kind) at a particular BCI") \ 2751 \ 2752 develop(intx, FreqCountInvocations, 1, \ 2753 "Scaling factor for branch frequencies (deprecated)") \ 2754 \ 2755 develop(intx, InlineFrequencyRatio, 20, \ 2756 "Ratio of call site execution to caller method invocation") \ 2757 \ 2758 develop_pd(intx, InlineFrequencyCount, \ 2759 "Count of call site execution necessary to trigger frequent " \ 2760 "inlining") \ 2761 \ 2762 develop(intx, InlineThrowCount, 50, \ 2763 "Force inlining of interpreted methods that throw this often") \ 2764 \ 2765 develop(intx, InlineThrowMaxSize, 200, \ 2766 "Force inlining of throwing methods smaller than this") \ 2767 \ 2768 product(intx, AliasLevel, 3, \ 2769 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2770 "2 for class split, 3 for unique instances") \ 2771 \ 2772 develop(bool, VerifyAliases, false, \ 2773 "perform extra checks on the results of alias analysis") \ 2774 \ 2775 develop(intx, ProfilerNodeSize, 1024, \ 2776 "Size in K to allocate for the Profile Nodes of each thread") \ 2777 \ 2778 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2779 "Number of times to spin wait on a v8 atomic operation lock") \ 2780 \ 2781 product(intx, ReadSpinIterations, 100, \ 2782 "Number of read attempts before a yield (spin inner loop)") \ 2783 \ 2784 product_pd(intx, PreInflateSpin, \ 2785 "Number of times to spin wait before inflation") \ 2786 \ 2787 product(intx, PreBlockSpin, 10, \ 2788 "Number of times to spin in an inflated lock before going to " \ 2789 "an OS lock") \ 2790 \ 2791 /* gc parameters */ \ 2792 product(uintx, MaxHeapSize, ScaleForWordSize(64*M), \ 2793 "Default maximum size for object heap (in bytes)") \ 2794 \ 2795 product_pd(uintx, NewSize, \ 2796 "Default size of new generation (in bytes)") \ 2797 \ 2798 product(uintx, MaxNewSize, max_uintx, \ 2799 "Maximum size of new generation (in bytes)") \ 2800 \ 2801 product(uintx, PretenureSizeThreshold, 0, \ 2802 "Max size in bytes of objects allocated in DefNew generation") \ 2803 \ 2804 product_pd(uintx, TLABSize, \ 2805 "Default (or starting) size of TLAB (in bytes)") \ 2806 \ 2807 product(uintx, MinTLABSize, 2*K, \ 2808 "Minimum allowed TLAB size (in bytes)") \ 2809 \ 2810 product(uintx, TLABAllocationWeight, 35, \ 2811 "Allocation averaging weight") \ 2812 \ 2813 product(uintx, TLABWasteTargetPercent, 1, \ 2814 "Percentage of Eden that can be wasted") \ 2815 \ 2816 product(uintx, TLABRefillWasteFraction, 64, \ 2817 "Max TLAB waste at a refill (internal fragmentation)") \ 2818 \ 2819 product(uintx, TLABWasteIncrement, 4, \ 2820 "Increment allowed waste at slow allocation") \ 2821 \ 2822 product_pd(intx, SurvivorRatio, \ 2823 "Ratio of eden/survivor space size") \ 2824 \ 2825 product_pd(intx, NewRatio, \ 2826 "Ratio of new/old generation sizes") \ 2827 \ 2828 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2829 "Max percent of eden objects that will be live at scavenge") \ 2830 \ 2831 product_pd(uintx, NewSizeThreadIncrease, \ 2832 "Additional size added to desired new generation size per " \ 2833 "non-daemon thread (in bytes)") \ 2834 \ 2835 product(uintx, OldSize, ScaleForWordSize(4096*K), \ 2836 "Default size of tenured generation (in bytes)") \ 2837 \ 2838 product_pd(uintx, PermSize, \ 2839 "Default size of permanent generation (in bytes)") \ 2840 \ 2841 product_pd(uintx, MaxPermSize, \ 2842 "Maximum size of permanent generation (in bytes)") \ 2843 \ 2844 product(uintx, MinHeapFreeRatio, 40, \ 2845 "Min percentage of heap free after GC to avoid expansion") \ 2846 \ 2847 product(uintx, MaxHeapFreeRatio, 70, \ 2848 "Max percentage of heap free after GC to avoid shrinking") \ 2849 \ 2850 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2851 "Number of milliseconds per MB of free space in the heap") \ 2852 \ 2853 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2854 "Min change in heap space due to GC (in bytes)") \ 2855 \ 2856 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 2857 "Min expansion of permanent heap (in bytes)") \ 2858 \ 2859 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 2860 "Max expansion of permanent heap without full GC (in bytes)") \ 2861 \ 2862 product(intx, QueuedAllocationWarningCount, 0, \ 2863 "Number of times an allocation that queues behind a GC " \ 2864 "will retry before printing a warning") \ 2865 \ 2866 diagnostic(uintx, VerifyGCStartAt, 0, \ 2867 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 2868 \ 2869 diagnostic(intx, VerifyGCLevel, 0, \ 2870 "Generation level at which to start +VerifyBefore/AfterGC") \ 2871 \ 2872 develop(uintx, ExitAfterGCNum, 0, \ 2873 "If non-zero, exit after this GC.") \ 2874 \ 2875 product(intx, MaxTenuringThreshold, 15, \ 2876 "Maximum value for tenuring threshold") \ 2877 \ 2878 product(intx, InitialTenuringThreshold, 7, \ 2879 "Initial value for tenuring threshold") \ 2880 \ 2881 product(intx, TargetSurvivorRatio, 50, \ 2882 "Desired percentage of survivor space used after scavenge") \ 2883 \ 2884 product(uintx, MarkSweepDeadRatio, 5, \ 2885 "Percentage (0-100) of the old gen allowed as dead wood." \ 2886 "Serial mark sweep treats this as both the min and max value." \ 2887 "CMS uses this value only if it falls back to mark sweep." \ 2888 "Par compact uses a variable scale based on the density of the" \ 2889 "generation and treats this as the max value when the heap is" \ 2890 "either completely full or completely empty. Par compact also" \ 2891 "has a smaller default value; see arguments.cpp.") \ 2892 \ 2893 product(uintx, PermMarkSweepDeadRatio, 20, \ 2894 "Percentage (0-100) of the perm gen allowed as dead wood." \ 2895 "See MarkSweepDeadRatio for collector-specific comments.") \ 2896 \ 2897 product(intx, MarkSweepAlwaysCompactCount, 4, \ 2898 "How often should we fully compact the heap (ignoring the dead " \ 2899 "space parameters)") \ 2900 \ 2901 product(intx, PrintCMSStatistics, 0, \ 2902 "Statistics for CMS") \ 2903 \ 2904 product(bool, PrintCMSInitiationStatistics, false, \ 2905 "Statistics for initiating a CMS collection") \ 2906 \ 2907 product(intx, PrintFLSStatistics, 0, \ 2908 "Statistics for CMS' FreeListSpace") \ 2909 \ 2910 product(intx, PrintFLSCensus, 0, \ 2911 "Census for CMS' FreeListSpace") \ 2912 \ 2913 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 2914 "Delay in ms between expansion and allocation") \ 2915 \ 2916 product(intx, DeferThrSuspendLoopCount, 4000, \ 2917 "(Unstable) Number of times to iterate in safepoint loop " \ 2918 " before blocking VM threads ") \ 2919 \ 2920 product(intx, DeferPollingPageLoopCount, -1, \ 2921 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 2922 "before changing safepoint polling page to RO ") \ 2923 \ 2924 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 2925 \ 2926 product(bool, UseDepthFirstScavengeOrder, true, \ 2927 "true: the scavenge order will be depth-first, " \ 2928 "false: the scavenge order will be breadth-first") \ 2929 \ 2930 product(bool, PSChunkLargeArrays, true, \ 2931 "true: process large arrays in chunks") \ 2932 \ 2933 product(uintx, GCDrainStackTargetSize, 64, \ 2934 "how many entries we'll try to leave on the stack during " \ 2935 "parallel GC") \ 2936 \ 2937 /* stack parameters */ \ 2938 product_pd(intx, StackYellowPages, \ 2939 "Number of yellow zone (recoverable overflows) pages") \ 2940 \ 2941 product_pd(intx, StackRedPages, \ 2942 "Number of red zone (unrecoverable overflows) pages") \ 2943 \ 2944 product_pd(intx, StackShadowPages, \ 2945 "Number of shadow zone (for overflow checking) pages" \ 2946 " this should exceed the depth of the VM and native call stack") \ 2947 \ 2948 product_pd(intx, ThreadStackSize, \ 2949 "Thread Stack Size (in Kbytes)") \ 2950 \ 2951 product_pd(intx, VMThreadStackSize, \ 2952 "Non-Java Thread Stack Size (in Kbytes)") \ 2953 \ 2954 product_pd(intx, CompilerThreadStackSize, \ 2955 "Compiler Thread Stack Size (in Kbytes)") \ 2956 \ 2957 develop_pd(uintx, JVMInvokeMethodSlack, \ 2958 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 2959 \ 2960 product(uintx, ThreadSafetyMargin, 50*M, \ 2961 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 2962 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 2963 "disable this feature") \ 2964 \ 2965 /* code cache parameters */ \ 2966 develop(uintx, CodeCacheSegmentSize, 64, \ 2967 "Code cache segment size (in bytes) - smallest unit of " \ 2968 "allocation") \ 2969 \ 2970 develop_pd(intx, CodeEntryAlignment, \ 2971 "Code entry alignment for generated code (in bytes)") \ 2972 \ 2973 product_pd(uintx, InitialCodeCacheSize, \ 2974 "Initial code cache size (in bytes)") \ 2975 \ 2976 product_pd(uintx, ReservedCodeCacheSize, \ 2977 "Reserved code cache size (in bytes) - maximum code cache size") \ 2978 \ 2979 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 2980 "When less than X space left, we stop compiling.") \ 2981 \ 2982 product_pd(uintx, CodeCacheExpansionSize, \ 2983 "Code cache expansion size (in bytes)") \ 2984 \ 2985 develop_pd(uintx, CodeCacheMinBlockLength, \ 2986 "Minimum number of segments in a code cache block.") \ 2987 \ 2988 notproduct(bool, ExitOnFullCodeCache, false, \ 2989 "Exit the VM if we fill the code cache.") \ 2990 \ 2991 /* interpreter debugging */ \ 2992 develop(intx, BinarySwitchThreshold, 5, \ 2993 "Minimal number of lookupswitch entries for rewriting to binary " \ 2994 "switch") \ 2995 \ 2996 develop(intx, StopInterpreterAt, 0, \ 2997 "Stops interpreter execution at specified bytecode number") \ 2998 \ 2999 develop(intx, TraceBytecodesAt, 0, \ 3000 "Traces bytecodes starting with specified bytecode number") \ 3001 \ 3002 /* compiler interface */ \ 3003 develop(intx, CIStart, 0, \ 3004 "the id of the first compilation to permit") \ 3005 \ 3006 develop(intx, CIStop, -1, \ 3007 "the id of the last compilation to permit") \ 3008 \ 3009 develop(intx, CIStartOSR, 0, \ 3010 "the id of the first osr compilation to permit " \ 3011 "(CICountOSR must be on)") \ 3012 \ 3013 develop(intx, CIStopOSR, -1, \ 3014 "the id of the last osr compilation to permit " \ 3015 "(CICountOSR must be on)") \ 3016 \ 3017 develop(intx, CIBreakAtOSR, -1, \ 3018 "id of osr compilation to break at") \ 3019 \ 3020 develop(intx, CIBreakAt, -1, \ 3021 "id of compilation to break at") \ 3022 \ 3023 product(ccstrlist, CompileOnly, "", \ 3024 "List of methods (pkg/class.name) to restrict compilation to") \ 3025 \ 3026 product(ccstr, CompileCommandFile, NULL, \ 3027 "Read compiler commands from this file [.hotspot_compiler]") \ 3028 \ 3029 product(ccstrlist, CompileCommand, "", \ 3030 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3031 \ 3032 product(bool, CICompilerCountPerCPU, false, \ 3033 "1 compiler thread for log(N CPUs)") \ 3034 \ 3035 develop(intx, CIFireOOMAt, -1, \ 3036 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3037 "(non-negative value throws OOM after this many CI accesses " \ 3038 "in each compile)") \ 3039 \ 3040 develop(intx, CIFireOOMAtDelay, -1, \ 3041 "Wait for this many CI accesses to occur in all compiles before " \ 3042 "beginning to throw OutOfMemoryErrors in each compile") \ 3043 \ 3044 notproduct(bool, CIObjectFactoryVerify, false, \ 3045 "enable potentially expensive verification in ciObjectFactory") \ 3046 \ 3047 /* Priorities */ \ 3048 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3049 \ 3050 product(intx, ThreadPriorityPolicy, 0, \ 3051 "0 : Normal. "\ 3052 " VM chooses priorities that are appropriate for normal "\ 3053 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3054 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3055 " map to lower native priority values. On Windows applications"\ 3056 " are allowed to use higher native priorities. However, with "\ 3057 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3058 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3059 " interfere with system threads. On Linux thread priorities "\ 3060 " are ignored because the OS does not support static priority "\ 3061 " in SCHED_OTHER scheduling class which is the only choice for"\ 3062 " non-root, non-realtime applications. "\ 3063 "1 : Aggressive. "\ 3064 " Java thread priorities map over to the entire range of "\ 3065 " native thread priorities. Higher Java thread priorities map "\ 3066 " to higher native thread priorities. This policy should be "\ 3067 " used with care, as sometimes it can cause performance "\ 3068 " degradation in the application and/or the entire system. On "\ 3069 " Linux this policy requires root privilege.") \ 3070 \ 3071 product(bool, ThreadPriorityVerbose, false, \ 3072 "print priority changes") \ 3073 \ 3074 product(intx, DefaultThreadPriority, -1, \ 3075 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3076 \ 3077 product(intx, CompilerThreadPriority, -1, \ 3078 "what priority should compiler threads run at (-1 means no change)") \ 3079 \ 3080 product(intx, VMThreadPriority, -1, \ 3081 "what priority should VM threads run at (-1 means no change)") \ 3082 \ 3083 product(bool, CompilerThreadHintNoPreempt, true, \ 3084 "(Solaris only) Give compiler threads an extra quanta") \ 3085 \ 3086 product(bool, VMThreadHintNoPreempt, false, \ 3087 "(Solaris only) Give VM thread an extra quanta") \ 3088 \ 3089 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3090 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3091 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3092 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3093 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3094 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3095 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3096 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3097 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3098 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3099 \ 3100 /* compiler debugging */ \ 3101 notproduct(intx, CompileTheWorldStartAt, 1, \ 3102 "First class to consider when using +CompileTheWorld") \ 3103 \ 3104 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3105 "Last class to consider when using +CompileTheWorld") \ 3106 \ 3107 develop(intx, NewCodeParameter, 0, \ 3108 "Testing Only: Create a dedicated integer parameter before " \ 3109 "putback") \ 3110 \ 3111 /* new oopmap storage allocation */ \ 3112 develop(intx, MinOopMapAllocation, 8, \ 3113 "Minimum number of OopMap entries in an OopMapSet") \ 3114 \ 3115 /* Background Compilation */ \ 3116 develop(intx, LongCompileThreshold, 50, \ 3117 "Used with +TraceLongCompiles") \ 3118 \ 3119 product(intx, StarvationMonitorInterval, 200, \ 3120 "Pause between each check in ms") \ 3121 \ 3122 /* recompilation */ \ 3123 product_pd(intx, CompileThreshold, \ 3124 "number of interpreted method invocations before (re-)compiling") \ 3125 \ 3126 product_pd(intx, BackEdgeThreshold, \ 3127 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3128 \ 3129 product(intx, Tier1BytecodeLimit, 10, \ 3130 "Must have at least this many bytecodes before tier1" \ 3131 "invocation counters are used") \ 3132 \ 3133 product_pd(intx, Tier2CompileThreshold, \ 3134 "threshold at which a tier 2 compilation is invoked") \ 3135 \ 3136 product_pd(intx, Tier2BackEdgeThreshold, \ 3137 "Back edge threshold at which a tier 2 compilation is invoked") \ 3138 \ 3139 product_pd(intx, Tier3CompileThreshold, \ 3140 "threshold at which a tier 3 compilation is invoked") \ 3141 \ 3142 product_pd(intx, Tier3BackEdgeThreshold, \ 3143 "Back edge threshold at which a tier 3 compilation is invoked") \ 3144 \ 3145 product_pd(intx, Tier4CompileThreshold, \ 3146 "threshold at which a tier 4 compilation is invoked") \ 3147 \ 3148 product_pd(intx, Tier4BackEdgeThreshold, \ 3149 "Back edge threshold at which a tier 4 compilation is invoked") \ 3150 \ 3151 product_pd(bool, TieredCompilation, \ 3152 "Enable two-tier compilation") \ 3153 \ 3154 product(bool, StressTieredRuntime, false, \ 3155 "Alternate client and server compiler on compile requests") \ 3156 \ 3157 product_pd(intx, OnStackReplacePercentage, \ 3158 "NON_TIERED number of method invocations/branches (expressed as %"\ 3159 "of CompileThreshold) before (re-)compiling OSR code") \ 3160 \ 3161 product(intx, InterpreterProfilePercentage, 33, \ 3162 "NON_TIERED number of method invocations/branches (expressed as %"\ 3163 "of CompileThreshold) before profiling in the interpreter") \ 3164 \ 3165 develop(intx, MaxRecompilationSearchLength, 10, \ 3166 "max. # frames to inspect searching for recompilee") \ 3167 \ 3168 develop(intx, MaxInterpretedSearchLength, 3, \ 3169 "max. # interp. frames to skip when searching for recompilee") \ 3170 \ 3171 develop(intx, DesiredMethodLimit, 8000, \ 3172 "desired max. method size (in bytecodes) after inlining") \ 3173 \ 3174 develop(intx, HugeMethodLimit, 8000, \ 3175 "don't compile methods larger than this if " \ 3176 "+DontCompileHugeMethods") \ 3177 \ 3178 /* New JDK 1.4 reflection implementation */ \ 3179 \ 3180 develop(bool, UseNewReflection, true, \ 3181 "Temporary flag for transition to reflection based on dynamic " \ 3182 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3183 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3184 "changes were needed") \ 3185 \ 3186 develop(bool, VerifyReflectionBytecodes, false, \ 3187 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3188 "in situations like that described in 4486457 or for " \ 3189 "constructors generated for serialization, so can not be enabled "\ 3190 "in product.") \ 3191 \ 3192 product(bool, ReflectionWrapResolutionErrors, true, \ 3193 "Temporary flag for transition to AbstractMethodError wrapped " \ 3194 "in InvocationTargetException. See 6531596") \ 3195 \ 3196 \ 3197 develop(intx, FastSuperclassLimit, 8, \ 3198 "Depth of hardwired instanceof accelerator array") \ 3199 \ 3200 /* Properties for Java libraries */ \ 3201 \ 3202 product(intx, MaxDirectMemorySize, -1, \ 3203 "Maximum total size of NIO direct-buffer allocations") \ 3204 \ 3205 /* temporary developer defined flags */ \ 3206 \ 3207 diagnostic(bool, UseNewCode, false, \ 3208 "Testing Only: Use the new version while testing") \ 3209 \ 3210 diagnostic(bool, UseNewCode2, false, \ 3211 "Testing Only: Use the new version while testing") \ 3212 \ 3213 diagnostic(bool, UseNewCode3, false, \ 3214 "Testing Only: Use the new version while testing") \ 3215 \ 3216 /* flags for performance data collection */ \ 3217 \ 3218 product(bool, UsePerfData, true, \ 3219 "Flag to disable jvmstat instrumentation for performance testing" \ 3220 "and problem isolation purposes.") \ 3221 \ 3222 product(bool, PerfDataSaveToFile, false, \ 3223 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3224 \ 3225 product(ccstr, PerfDataSaveFile, NULL, \ 3226 "Save PerfData memory to the specified absolute pathname," \ 3227 "%p in the file name if present will be replaced by pid") \ 3228 \ 3229 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3230 "Data sampling interval in milliseconds") \ 3231 \ 3232 develop(bool, PerfTraceDataCreation, false, \ 3233 "Trace creation of Performance Data Entries") \ 3234 \ 3235 develop(bool, PerfTraceMemOps, false, \ 3236 "Trace PerfMemory create/attach/detach calls") \ 3237 \ 3238 product(bool, PerfDisableSharedMem, false, \ 3239 "Store performance data in standard memory") \ 3240 \ 3241 product(intx, PerfDataMemorySize, 32*K, \ 3242 "Size of performance data memory region. Will be rounded " \ 3243 "up to a multiple of the native os page size.") \ 3244 \ 3245 product(intx, PerfMaxStringConstLength, 1024, \ 3246 "Maximum PerfStringConstant string length before truncation") \ 3247 \ 3248 product(bool, PerfAllowAtExitRegistration, false, \ 3249 "Allow registration of atexit() methods") \ 3250 \ 3251 product(bool, PerfBypassFileSystemCheck, false, \ 3252 "Bypass Win32 file system criteria checks (Windows Only)") \ 3253 \ 3254 product(intx, UnguardOnExecutionViolation, 0, \ 3255 "Unguard page and retry on no-execute fault (Win32 only)" \ 3256 "0=off, 1=conservative, 2=aggressive") \ 3257 \ 3258 /* Serviceability Support */ \ 3259 \ 3260 product(bool, ManagementServer, false, \ 3261 "Create JMX Management Server") \ 3262 \ 3263 product(bool, DisableAttachMechanism, false, \ 3264 "Disable mechanism that allows tools to attach to this VM") \ 3265 \ 3266 product(bool, StartAttachListener, false, \ 3267 "Always start Attach Listener at VM startup") \ 3268 \ 3269 manageable(bool, PrintConcurrentLocks, false, \ 3270 "Print java.util.concurrent locks in thread dump") \ 3271 \ 3272 /* Shared spaces */ \ 3273 \ 3274 product(bool, UseSharedSpaces, true, \ 3275 "Use shared spaces in the permanent generation") \ 3276 \ 3277 product(bool, RequireSharedSpaces, false, \ 3278 "Require shared spaces in the permanent generation") \ 3279 \ 3280 product(bool, ForceSharedSpaces, false, \ 3281 "Require shared spaces in the permanent generation") \ 3282 \ 3283 product(bool, DumpSharedSpaces, false, \ 3284 "Special mode: JVM reads a class list, loads classes, builds " \ 3285 "shared spaces, and dumps the shared spaces to a file to be " \ 3286 "used in future JVM runs.") \ 3287 \ 3288 product(bool, PrintSharedSpaces, false, \ 3289 "Print usage of shared spaces") \ 3290 \ 3291 product(uintx, SharedDummyBlockSize, 512*M, \ 3292 "Size of dummy block used to shift heap addresses (in bytes)") \ 3293 \ 3294 product(uintx, SharedReadWriteSize, 12*M, \ 3295 "Size of read-write space in permanent generation (in bytes)") \ 3296 \ 3297 product(uintx, SharedReadOnlySize, 10*M, \ 3298 "Size of read-only space in permanent generation (in bytes)") \ 3299 \ 3300 product(uintx, SharedMiscDataSize, 4*M, \ 3301 "Size of the shared data area adjacent to the heap (in bytes)") \ 3302 \ 3303 product(uintx, SharedMiscCodeSize, 4*M, \ 3304 "Size of the shared code area adjacent to the heap (in bytes)") \ 3305 \ 3306 diagnostic(bool, SharedOptimizeColdStart, true, \ 3307 "At dump time, order shared objects to achieve better " \ 3308 "cold startup time.") \ 3309 \ 3310 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3311 "Reordering policy for SharedOptimizeColdStart " \ 3312 "0=favor classload-time locality, 1=balanced, " \ 3313 "2=favor runtime locality") \ 3314 \ 3315 diagnostic(bool, SharedSkipVerify, false, \ 3316 "Skip assert() and verify() which page-in unwanted shared " \ 3317 "objects. ") \ 3318 \ 3319 product(bool, AnonymousClasses, false, \ 3320 "support sun.misc.Unsafe.defineAnonymousClass") \ 3321 \ 3322 experimental(bool, EnableMethodHandles, false, \ 3323 "support method handles (true by default under JSR 292)") \ 3324 \ 3325 diagnostic(intx, MethodHandlePushLimit, 3, \ 3326 "number of additional stack slots a method handle may push") \ 3327 \ 3328 develop(bool, TraceMethodHandles, false, \ 3329 "trace internal method handle operations") \ 3330 \ 3331 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3332 "perform extra checks when constructing method handles") \ 3333 \ 3334 diagnostic(bool, OptimizeMethodHandles, true, \ 3335 "when constructing method handles, try to improve them") \ 3336 \ 3337 experimental(bool, EnableInvokeDynamic, false, \ 3338 "recognize the invokedynamic instruction") \ 3339 \ 3340 develop(bool, TraceInvokeDynamic, false, \ 3341 "trace internal invoke dynamic operations") \ 3342 \ 3343 product(bool, TaggedStackInterpreter, false, \ 3344 "Insert tags in interpreter execution stack for oopmap generaion")\ 3345 \ 3346 diagnostic(bool, PauseAtStartup, false, \ 3347 "Causes the VM to pause at startup time and wait for the pause " \ 3348 "file to be removed (default: ./vm.paused.<pid>)") \ 3349 \ 3350 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3351 "The file to create and for whose removal to await when pausing " \ 3352 "at startup. (default: ./vm.paused.<pid>)") \ 3353 \ 3354 product(bool, ExtendedDTraceProbes, false, \ 3355 "Enable performance-impacting dtrace probes") \ 3356 \ 3357 product(bool, DTraceMethodProbes, false, \ 3358 "Enable dtrace probes for method-entry and method-exit") \ 3359 \ 3360 product(bool, DTraceAllocProbes, false, \ 3361 "Enable dtrace probes for object allocation") \ 3362 \ 3363 product(bool, DTraceMonitorProbes, false, \ 3364 "Enable dtrace probes for monitor events") \ 3365 \ 3366 product(bool, RelaxAccessControlCheck, false, \ 3367 "Relax the access control checks in the verifier") \ 3368 \ 3369 diagnostic(bool, PrintDTraceDOF, false, \ 3370 "Print the DTrace DOF passed to the system for JSDT probes") \ 3371 \ 3372 product(bool, UseVMInterruptibleIO, false, \ 3373 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3374 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3375 " of this flag is true for JDK 6 and earliers") 3376 3377 3378/* 3379 * Macros for factoring of globals 3380 */ 3381 3382// Interface macros 3383#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3384#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3385#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3386#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3387#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3388#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3389#ifdef PRODUCT 3390#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3391#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3392#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3393#else 3394#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3395#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3396#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3397#endif 3398// Special LP64 flags, product only needed for now. 3399#ifdef _LP64 3400#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3401#else 3402#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3403#endif // _LP64 3404 3405// Implementation macros 3406#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3407#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3408#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3409#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3410#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3411#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3412#ifdef PRODUCT 3413#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3414#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3415#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3416#else 3417#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3418#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3419#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3420#endif 3421#ifdef _LP64 3422#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3423#else 3424#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3425#endif // _LP64 3426 3427RUNTIME_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) 3428 3429RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3430