globals.hpp revision 1757:c99c53f07c14
1/* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 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, InlineSmallCode, 0); 51define_pd_global(intx, NewSizeThreadIncrease, 4*K); 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(uint64_t,MaxRAM, 1ULL*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 94 NOT_PRODUCT(const char *doc;) 95 96 const char *kind; 97 FlagValueOrigin origin; 98 99 // points to all Flags static array 100 static Flag *flags; 101 102 // number of flags 103 static size_t numFlags; 104 105 static Flag* find_flag(char* name, size_t length); 106 107 bool is_bool() const { return strcmp(type, "bool") == 0; } 108 bool get_bool() const { return *((bool*) addr); } 109 void set_bool(bool value) { *((bool*) addr) = value; } 110 111 bool is_intx() const { return strcmp(type, "intx") == 0; } 112 intx get_intx() const { return *((intx*) addr); } 113 void set_intx(intx value) { *((intx*) addr) = value; } 114 115 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 116 uintx get_uintx() const { return *((uintx*) addr); } 117 void set_uintx(uintx value) { *((uintx*) addr) = value; } 118 119 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 120 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 121 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 122 123 bool is_double() const { return strcmp(type, "double") == 0; } 124 double get_double() const { return *((double*) addr); } 125 void set_double(double value) { *((double*) addr) = value; } 126 127 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 128 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 129 ccstr get_ccstr() const { return *((ccstr*) addr); } 130 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 131 132 bool is_unlocker() const; 133 bool is_unlocked() const; 134 bool is_writeable() const; 135 bool is_external() const; 136 137 void print_on(outputStream* st, bool withComments = false ); 138 void print_as_flag(outputStream* st); 139}; 140 141// debug flags control various aspects of the VM and are global accessible 142 143// use FlagSetting to temporarily change some debug flag 144// e.g. FlagSetting fs(DebugThisAndThat, true); 145// restored to previous value upon leaving scope 146class FlagSetting { 147 bool val; 148 bool* flag; 149 public: 150 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 151 ~FlagSetting() { *flag = val; } 152}; 153 154 155class CounterSetting { 156 intx* counter; 157 public: 158 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 159 ~CounterSetting() { (*counter)--; } 160}; 161 162 163class IntFlagSetting { 164 intx val; 165 intx* flag; 166 public: 167 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 168 ~IntFlagSetting() { *flag = val; } 169}; 170 171 172class DoubleFlagSetting { 173 double val; 174 double* flag; 175 public: 176 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 177 ~DoubleFlagSetting() { *flag = val; } 178}; 179 180 181class CommandLineFlags { 182 public: 183 static bool boolAt(char* name, size_t len, bool* value); 184 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 185 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 186 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 187 188 static bool intxAt(char* name, size_t len, intx* value); 189 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 190 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 191 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 192 193 static bool uintxAt(char* name, size_t len, uintx* value); 194 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 195 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 196 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 197 198 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 199 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 200 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 201 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 202 203 static bool doubleAt(char* name, size_t len, double* value); 204 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 205 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 206 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 207 208 static bool ccstrAt(char* name, size_t len, ccstr* value); 209 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 210 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 211 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 212 213 // Returns false if name is not a command line flag. 214 static bool wasSetOnCmdline(const char* name, bool* value); 215 static void printSetFlags(); 216 217 static void printFlags(bool withComments = false ); 218 219 static void verify() PRODUCT_RETURN; 220}; 221 222// use this for flags that are true by default in the debug version but 223// false in the optimized version, and vice versa 224#ifdef ASSERT 225#define trueInDebug true 226#define falseInDebug false 227#else 228#define trueInDebug false 229#define falseInDebug true 230#endif 231 232// use this for flags that are true per default in the product build 233// but false in development builds, and vice versa 234#ifdef PRODUCT 235#define trueInProduct true 236#define falseInProduct false 237#else 238#define trueInProduct false 239#define falseInProduct true 240#endif 241 242// use this for flags that are true per default in the tiered build 243// but false in non-tiered builds, and vice versa 244#ifdef TIERED 245#define trueInTiered true 246#define falseInTiered false 247#else 248#define trueInTiered false 249#define falseInTiered true 250#endif 251 252// develop flags are settable / visible only during development and are constant in the PRODUCT version 253// product flags are always settable / visible 254// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 255 256// A flag must be declared with one of the following types: 257// bool, intx, uintx, ccstr. 258// The type "ccstr" is an alias for "const char*" and is used 259// only in this file, because the macrology requires single-token type names. 260 261// Note: Diagnostic options not meant for VM tuning or for product modes. 262// They are to be used for VM quality assurance or field diagnosis 263// of VM bugs. They are hidden so that users will not be encouraged to 264// try them as if they were VM ordinary execution options. However, they 265// are available in the product version of the VM. Under instruction 266// from support engineers, VM customers can turn them on to collect 267// diagnostic information about VM problems. To use a VM diagnostic 268// option, you must first specify +UnlockDiagnosticVMOptions. 269// (This master switch also affects the behavior of -Xprintflags.) 270// 271// experimental flags are in support of features that are not 272// part of the officially supported product, but are available 273// for experimenting with. They could, for example, be performance 274// features that may not have undergone full or rigorous QA, but which may 275// help performance in some cases and released for experimentation 276// by the community of users and developers. This flag also allows one to 277// be able to build a fully supported product that nonetheless also 278// ships with some unsupported, lightly tested, experimental features. 279// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 280// UnlockExperimentalVMOptions flag, which allows the control and 281// modification of the experimental flags. 282// 283// Nota bene: neither diagnostic nor experimental options should be used casually, 284// and they are not supported on production loads, except under explicit 285// direction from support engineers. 286// 287// manageable flags are writeable external product flags. 288// They are dynamically writeable through the JDK management interface 289// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 290// These flags are external exported interface (see CCC). The list of 291// manageable flags can be queried programmatically through the management 292// interface. 293// 294// A flag can be made as "manageable" only if 295// - the flag is defined in a CCC as an external exported interface. 296// - the VM implementation supports dynamic setting of the flag. 297// This implies that the VM must *always* query the flag variable 298// and not reuse state related to the flag state at any given time. 299// - you want the flag to be queried programmatically by the customers. 300// 301// product_rw flags are writeable internal product flags. 302// They are like "manageable" flags but for internal/private use. 303// The list of product_rw flags are internal/private flags which 304// may be changed/removed in a future release. It can be set 305// through the management interface to get/set value 306// when the name of flag is supplied. 307// 308// A flag can be made as "product_rw" only if 309// - the VM implementation supports dynamic setting of the flag. 310// This implies that the VM must *always* query the flag variable 311// and not reuse state related to the flag state at any given time. 312// 313// Note that when there is a need to support develop flags to be writeable, 314// it can be done in the same way as product_rw. 315 316#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 317 \ 318 lp64_product(bool, UseCompressedOops, false, \ 319 "Use 32-bit object references in 64-bit VM. " \ 320 "lp64_product means flag is always constant in 32 bit VM") \ 321 \ 322 notproduct(bool, CheckCompressedOops, true, \ 323 "generate checks in encoding/decoding code in debug VM") \ 324 \ 325 product_pd(uintx, HeapBaseMinAddress, \ 326 "OS specific low limit for heap base address") \ 327 \ 328 diagnostic(bool, PrintCompressedOopsMode, false, \ 329 "Print compressed oops base address and encoding mode") \ 330 \ 331 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 332 "Default object alignment in bytes, 8 is minimum") \ 333 \ 334 /* UseMembar is theoretically a temp flag used for memory barrier \ 335 * removal testing. It was supposed to be removed before FCS but has \ 336 * been re-added (see 6401008) */ \ 337 product(bool, UseMembar, false, \ 338 "(Unstable) Issues membars on thread state transitions") \ 339 \ 340 /* Temporary: See 6948537 */ \ 341 experimental(bool, UseMemSetInBOT, true, \ 342 "(Unstable) uses memset in BOT updates in GC code") \ 343 \ 344 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 345 "Enable normal processing of flags relating to field diagnostics")\ 346 \ 347 experimental(bool, UnlockExperimentalVMOptions, false, \ 348 "Enable normal processing of flags relating to experimental features")\ 349 \ 350 product(bool, JavaMonitorsInStackTrace, true, \ 351 "Print info. about Java monitor locks when the stacks are dumped")\ 352 \ 353 product_pd(bool, UseLargePages, \ 354 "Use large page memory") \ 355 \ 356 product_pd(bool, UseLargePagesIndividualAllocation, \ 357 "Allocate large pages individually for better affinity") \ 358 \ 359 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 360 "Fail large pages individual allocation") \ 361 \ 362 develop(bool, TracePageSizes, false, \ 363 "Trace page size selection and usage.") \ 364 \ 365 product(bool, UseNUMA, false, \ 366 "Use NUMA if available") \ 367 \ 368 product(bool, ForceNUMA, false, \ 369 "Force NUMA optimizations on single-node/UMA systems") \ 370 \ 371 product(intx, NUMAChunkResizeWeight, 20, \ 372 "Percentage (0-100) used to weight the current sample when " \ 373 "computing exponentially decaying average for " \ 374 "AdaptiveNUMAChunkSizing") \ 375 \ 376 product(intx, NUMASpaceResizeRate, 1*G, \ 377 "Do not reallocate more that this amount per collection") \ 378 \ 379 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 380 "Enable adaptive chunk sizing for NUMA") \ 381 \ 382 product(bool, NUMAStats, false, \ 383 "Print NUMA stats in detailed heap information") \ 384 \ 385 product(intx, NUMAPageScanRate, 256, \ 386 "Maximum number of pages to include in the page scan procedure") \ 387 \ 388 product_pd(bool, NeedsDeoptSuspend, \ 389 "True for register window machines (sparc/ia64)") \ 390 \ 391 product(intx, UseSSE, 99, \ 392 "Highest supported SSE instructions set on x86/x64") \ 393 \ 394 product(uintx, LargePageSizeInBytes, 0, \ 395 "Large page size (0 to let VM choose the page size") \ 396 \ 397 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 398 "Use large pages if max heap is at least this big") \ 399 \ 400 product(bool, ForceTimeHighResolution, false, \ 401 "Using high time resolution(For Win32 only)") \ 402 \ 403 develop(bool, TraceItables, false, \ 404 "Trace initialization and use of itables") \ 405 \ 406 develop(bool, TracePcPatching, false, \ 407 "Trace usage of frame::patch_pc") \ 408 \ 409 develop(bool, TraceJumps, false, \ 410 "Trace assembly jumps in thread ring buffer") \ 411 \ 412 develop(bool, TraceRelocator, false, \ 413 "Trace the bytecode relocator") \ 414 \ 415 develop(bool, TraceLongCompiles, false, \ 416 "Print out every time compilation is longer than " \ 417 "a given threashold") \ 418 \ 419 develop(bool, SafepointALot, false, \ 420 "Generates a lot of safepoints. Works with " \ 421 "GuaranteedSafepointInterval") \ 422 \ 423 product_pd(bool, BackgroundCompilation, \ 424 "A thread requesting compilation is not blocked during " \ 425 "compilation") \ 426 \ 427 product(bool, PrintVMQWaitTime, false, \ 428 "Prints out the waiting time in VM operation queue") \ 429 \ 430 develop(bool, BailoutToInterpreterForThrows, false, \ 431 "Compiled methods which throws/catches exceptions will be " \ 432 "deopt and intp.") \ 433 \ 434 develop(bool, NoYieldsInMicrolock, false, \ 435 "Disable yields in microlock") \ 436 \ 437 develop(bool, TraceOopMapGeneration, false, \ 438 "Shows oopmap generation") \ 439 \ 440 product(bool, MethodFlushing, true, \ 441 "Reclamation of zombie and not-entrant methods") \ 442 \ 443 develop(bool, VerifyStack, false, \ 444 "Verify stack of each thread when it is entering a runtime call") \ 445 \ 446 develop(bool, ForceUnreachable, false, \ 447 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 448 \ 449 notproduct(bool, StressDerivedPointers, false, \ 450 "Force scavenge when a derived pointers is detected on stack " \ 451 "after rtm call") \ 452 \ 453 develop(bool, TraceDerivedPointers, false, \ 454 "Trace traversal of derived pointers on stack") \ 455 \ 456 notproduct(bool, TraceCodeBlobStacks, false, \ 457 "Trace stack-walk of codeblobs") \ 458 \ 459 product(bool, PrintJNIResolving, false, \ 460 "Used to implement -v:jni") \ 461 \ 462 notproduct(bool, PrintRewrites, false, \ 463 "Print methods that are being rewritten") \ 464 \ 465 product(bool, UseInlineCaches, true, \ 466 "Use Inline Caches for virtual calls ") \ 467 \ 468 develop(bool, InlineArrayCopy, true, \ 469 "inline arraycopy native that is known to be part of " \ 470 "base library DLL") \ 471 \ 472 develop(bool, InlineObjectHash, true, \ 473 "inline Object::hashCode() native that is known to be part " \ 474 "of base library DLL") \ 475 \ 476 develop(bool, InlineObjectCopy, true, \ 477 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 478 \ 479 develop(bool, InlineNatives, true, \ 480 "inline natives that are known to be part of base library DLL") \ 481 \ 482 develop(bool, InlineMathNatives, true, \ 483 "inline SinD, CosD, etc.") \ 484 \ 485 develop(bool, InlineClassNatives, true, \ 486 "inline Class.isInstance, etc") \ 487 \ 488 develop(bool, InlineAtomicLong, true, \ 489 "inline sun.misc.AtomicLong") \ 490 \ 491 develop(bool, InlineThreadNatives, true, \ 492 "inline Thread.currentThread, etc") \ 493 \ 494 develop(bool, InlineReflectionGetCallerClass, true, \ 495 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 496 "of base library DLL") \ 497 \ 498 develop(bool, InlineUnsafeOps, true, \ 499 "inline memory ops (native methods) from sun.misc.Unsafe") \ 500 \ 501 develop(bool, ConvertCmpD2CmpF, true, \ 502 "Convert cmpD to cmpF when one input is constant in float range") \ 503 \ 504 develop(bool, ConvertFloat2IntClipping, true, \ 505 "Convert float2int clipping idiom to integer clipping") \ 506 \ 507 develop(bool, SpecialStringCompareTo, true, \ 508 "special version of string compareTo") \ 509 \ 510 develop(bool, SpecialStringIndexOf, true, \ 511 "special version of string indexOf") \ 512 \ 513 develop(bool, SpecialStringEquals, true, \ 514 "special version of string equals") \ 515 \ 516 develop(bool, SpecialArraysEquals, true, \ 517 "special version of Arrays.equals(char[],char[])") \ 518 \ 519 product(bool, UseSSE42Intrinsics, false, \ 520 "SSE4.2 versions of intrinsics") \ 521 \ 522 develop(bool, TraceCallFixup, false, \ 523 "traces all call fixups") \ 524 \ 525 develop(bool, DeoptimizeALot, false, \ 526 "deoptimize at every exit from the runtime system") \ 527 \ 528 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 529 "a comma separated list of bcis to deoptimize at") \ 530 \ 531 product(bool, DeoptimizeRandom, false, \ 532 "deoptimize random frames on random exit from the runtime system")\ 533 \ 534 notproduct(bool, ZombieALot, false, \ 535 "creates zombies (non-entrant) at exit from the runt. system") \ 536 \ 537 notproduct(bool, WalkStackALot, false, \ 538 "trace stack (no print) at every exit from the runtime system") \ 539 \ 540 develop(bool, Debugging, false, \ 541 "set when executing debug methods in debug.ccp " \ 542 "(to prevent triggering assertions)") \ 543 \ 544 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 545 "Enable strict checks that safepoints cannot happen for threads " \ 546 "that used No_Safepoint_Verifier") \ 547 \ 548 notproduct(bool, VerifyLastFrame, false, \ 549 "Verify oops on last frame on entry to VM") \ 550 \ 551 develop(bool, TraceHandleAllocation, false, \ 552 "Prints out warnings when suspicious many handles are allocated") \ 553 \ 554 product(bool, UseCompilerSafepoints, true, \ 555 "Stop at safepoints in compiled code") \ 556 \ 557 product(bool, UseSplitVerifier, true, \ 558 "use split verifier with StackMapTable attributes") \ 559 \ 560 product(bool, FailOverToOldVerifier, true, \ 561 "fail over to old verifier when split verifier fails") \ 562 \ 563 develop(bool, ShowSafepointMsgs, false, \ 564 "Show msg. about safepoint synch.") \ 565 \ 566 product(bool, SafepointTimeout, false, \ 567 "Time out and warn or fail after SafepointTimeoutDelay " \ 568 "milliseconds if failed to reach safepoint") \ 569 \ 570 develop(bool, DieOnSafepointTimeout, false, \ 571 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 572 \ 573 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 574 /* typically, at most a few retries are needed */ \ 575 product(intx, SuspendRetryCount, 50, \ 576 "Maximum retry count for an external suspend request") \ 577 \ 578 product(intx, SuspendRetryDelay, 5, \ 579 "Milliseconds to delay per retry (* current_retry_count)") \ 580 \ 581 product(bool, AssertOnSuspendWaitFailure, false, \ 582 "Assert/Guarantee on external suspend wait failure") \ 583 \ 584 product(bool, TraceSuspendWaitFailures, false, \ 585 "Trace external suspend wait failures") \ 586 \ 587 product(bool, MaxFDLimit, true, \ 588 "Bump the number of file descriptors to max in solaris.") \ 589 \ 590 notproduct(bool, LogEvents, trueInDebug, \ 591 "Enable Event log") \ 592 \ 593 product(bool, BytecodeVerificationRemote, true, \ 594 "Enables the Java bytecode verifier for remote classes") \ 595 \ 596 product(bool, BytecodeVerificationLocal, false, \ 597 "Enables the Java bytecode verifier for local classes") \ 598 \ 599 develop(bool, ForceFloatExceptions, trueInDebug, \ 600 "Force exceptions on FP stack under/overflow") \ 601 \ 602 develop(bool, SoftMatchFailure, trueInProduct, \ 603 "If the DFA fails to match a node, print a message and bail out") \ 604 \ 605 develop(bool, VerifyStackAtCalls, false, \ 606 "Verify that the stack pointer is unchanged after calls") \ 607 \ 608 develop(bool, TraceJavaAssertions, false, \ 609 "Trace java language assertions") \ 610 \ 611 notproduct(bool, CheckAssertionStatusDirectives, false, \ 612 "temporary - see javaClasses.cpp") \ 613 \ 614 notproduct(bool, PrintMallocFree, false, \ 615 "Trace calls to C heap malloc/free allocation") \ 616 \ 617 product(bool, PrintOopAddress, false, \ 618 "Always print the location of the oop") \ 619 \ 620 notproduct(bool, VerifyCodeCacheOften, false, \ 621 "Verify compiled-code cache often") \ 622 \ 623 develop(bool, ZapDeadCompiledLocals, false, \ 624 "Zap dead locals in compiler frames") \ 625 \ 626 notproduct(bool, ZapDeadLocalsOld, false, \ 627 "Zap dead locals (old version, zaps all frames when " \ 628 "entering the VM") \ 629 \ 630 notproduct(bool, CheckOopishValues, false, \ 631 "Warn if value contains oop ( requires ZapDeadLocals)") \ 632 \ 633 develop(bool, UseMallocOnly, false, \ 634 "use only malloc/free for allocation (no resource area/arena)") \ 635 \ 636 develop(bool, PrintMalloc, false, \ 637 "print all malloc/free calls") \ 638 \ 639 develop(bool, ZapResourceArea, trueInDebug, \ 640 "Zap freed resource/arena space with 0xABABABAB") \ 641 \ 642 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 643 "Zap freed VM handle space with 0xBCBCBCBC") \ 644 \ 645 develop(bool, ZapJNIHandleArea, trueInDebug, \ 646 "Zap freed JNI handle space with 0xFEFEFEFE") \ 647 \ 648 notproduct(bool, ZapStackSegments, trueInDebug, \ 649 "Zap allocated/freed Stack segments with 0xFADFADED") \ 650 \ 651 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 652 "Zap unused heap space with 0xBAADBABE") \ 653 \ 654 develop(bool, TraceZapUnusedHeapArea, false, \ 655 "Trace zapping of unused heap space") \ 656 \ 657 develop(bool, CheckZapUnusedHeapArea, false, \ 658 "Check zapping of unused heap space") \ 659 \ 660 develop(bool, ZapFillerObjects, trueInDebug, \ 661 "Zap filler objects with 0xDEAFBABE") \ 662 \ 663 develop(bool, PrintVMMessages, true, \ 664 "Print vm messages on console") \ 665 \ 666 product(bool, PrintGCApplicationConcurrentTime, false, \ 667 "Print the time the application has been running") \ 668 \ 669 product(bool, PrintGCApplicationStoppedTime, false, \ 670 "Print the time the application has been stopped") \ 671 \ 672 notproduct(uintx, ErrorHandlerTest, 0, \ 673 "If > 0, provokes an error after VM initialization; the value" \ 674 "determines which error to provoke. See test_error_handler()" \ 675 "in debug.cpp.") \ 676 \ 677 develop(bool, Verbose, false, \ 678 "Prints additional debugging information from other modes") \ 679 \ 680 develop(bool, PrintMiscellaneous, false, \ 681 "Prints uncategorized debugging information (requires +Verbose)") \ 682 \ 683 develop(bool, WizardMode, false, \ 684 "Prints much more debugging information") \ 685 \ 686 product(bool, ShowMessageBoxOnError, false, \ 687 "Keep process alive on VM fatal error") \ 688 \ 689 product_pd(bool, UseOSErrorReporting, \ 690 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 691 \ 692 product(bool, SuppressFatalErrorMessage, false, \ 693 "Do NO Fatal Error report [Avoid deadlock]") \ 694 \ 695 product(ccstrlist, OnError, "", \ 696 "Run user-defined commands on fatal error; see VMError.cpp " \ 697 "for examples") \ 698 \ 699 product(ccstrlist, OnOutOfMemoryError, "", \ 700 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 701 \ 702 manageable(bool, HeapDumpBeforeFullGC, false, \ 703 "Dump heap to file before any major stop-world GC") \ 704 \ 705 manageable(bool, HeapDumpAfterFullGC, false, \ 706 "Dump heap to file after any major stop-world GC") \ 707 \ 708 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 709 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 710 \ 711 manageable(ccstr, HeapDumpPath, NULL, \ 712 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 713 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 714 "in the working directory)") \ 715 \ 716 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 717 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 718 "when the heap usage is larger than this") \ 719 \ 720 develop(uintx, HeapDumpSegmentSize, 1*G, \ 721 "Approximate segment size when generating a segmented heap dump") \ 722 \ 723 develop(bool, BreakAtWarning, false, \ 724 "Execute breakpoint upon encountering VM warning") \ 725 \ 726 product_pd(bool, UseVectoredExceptions, \ 727 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 728 \ 729 develop(bool, TraceVMOperation, false, \ 730 "Trace vm operations") \ 731 \ 732 develop(bool, UseFakeTimers, false, \ 733 "Tells whether the VM should use system time or a fake timer") \ 734 \ 735 diagnostic(bool, LogCompilation, false, \ 736 "Log compilation activity in detail to hotspot.log or LogFile") \ 737 \ 738 product(bool, PrintCompilation, false, \ 739 "Print compilations") \ 740 \ 741 diagnostic(bool, TraceNMethodInstalls, false, \ 742 "Trace nmethod intallation") \ 743 \ 744 diagnostic(intx, ScavengeRootsInCode, 0, \ 745 "0: do not allow scavengable oops in the code cache; " \ 746 "1: allow scavenging from the code cache; " \ 747 "2: emit as many constants as the compiler can see") \ 748 \ 749 diagnostic(bool, TraceOSRBreakpoint, false, \ 750 "Trace OSR Breakpoint ") \ 751 \ 752 diagnostic(bool, TraceCompileTriggered, false, \ 753 "Trace compile triggered") \ 754 \ 755 diagnostic(bool, TraceTriggers, false, \ 756 "Trace triggers") \ 757 \ 758 product(bool, AlwaysRestoreFPU, false, \ 759 "Restore the FPU control word after every JNI call (expensive)") \ 760 \ 761 notproduct(bool, PrintCompilation2, false, \ 762 "Print additional statistics per compilation") \ 763 \ 764 diagnostic(bool, PrintAdapterHandlers, false, \ 765 "Print code generated for i2c/c2i adapters") \ 766 \ 767 develop(bool, VerifyAdapterSharing, false, \ 768 "Verify that the code for shared adapters is the equivalent") \ 769 \ 770 diagnostic(bool, PrintAssembly, false, \ 771 "Print assembly code (using external disassembler.so)") \ 772 \ 773 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 774 "Options string passed to disassembler.so") \ 775 \ 776 diagnostic(bool, PrintNMethods, false, \ 777 "Print assembly code for nmethods when generated") \ 778 \ 779 diagnostic(bool, PrintNativeNMethods, false, \ 780 "Print assembly code for native nmethods when generated") \ 781 \ 782 develop(bool, PrintDebugInfo, false, \ 783 "Print debug information for all nmethods when generated") \ 784 \ 785 develop(bool, PrintRelocations, false, \ 786 "Print relocation information for all nmethods when generated") \ 787 \ 788 develop(bool, PrintDependencies, false, \ 789 "Print dependency information for all nmethods when generated") \ 790 \ 791 develop(bool, PrintExceptionHandlers, false, \ 792 "Print exception handler tables for all nmethods when generated") \ 793 \ 794 develop(bool, InterceptOSException, false, \ 795 "Starts debugger when an implicit OS (e.g., NULL) " \ 796 "exception happens") \ 797 \ 798 notproduct(bool, PrintCodeCache, false, \ 799 "Print the compiled_code cache when exiting") \ 800 \ 801 develop(bool, PrintCodeCache2, false, \ 802 "Print detailed info on the compiled_code cache when exiting") \ 803 \ 804 diagnostic(bool, PrintStubCode, false, \ 805 "Print generated stub code") \ 806 \ 807 product(bool, StackTraceInThrowable, true, \ 808 "Collect backtrace in throwable when exception happens") \ 809 \ 810 product(bool, OmitStackTraceInFastThrow, true, \ 811 "Omit backtraces for some 'hot' exceptions in optimized code") \ 812 \ 813 product(bool, ProfilerPrintByteCodeStatistics, false, \ 814 "Prints byte code statictics when dumping profiler output") \ 815 \ 816 product(bool, ProfilerRecordPC, false, \ 817 "Collects tick for each 16 byte interval of compiled code") \ 818 \ 819 product(bool, ProfileVM, false, \ 820 "Profiles ticks that fall within VM (either in the VM Thread " \ 821 "or VM code called through stubs)") \ 822 \ 823 product(bool, ProfileIntervals, false, \ 824 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 825 \ 826 notproduct(bool, ProfilerCheckIntervals, false, \ 827 "Collect and print info on spacing of profiler ticks") \ 828 \ 829 develop(bool, PrintJVMWarnings, false, \ 830 "Prints warnings for unimplemented JVM functions") \ 831 \ 832 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 833 "Prints warnings for stalled SpinLocks") \ 834 \ 835 develop(bool, InitializeJavaLangSystem, true, \ 836 "Initialize java.lang.System - turn off for individual " \ 837 "method debugging") \ 838 \ 839 develop(bool, InitializeJavaLangString, true, \ 840 "Initialize java.lang.String - turn off for individual " \ 841 "method debugging") \ 842 \ 843 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 844 "Initialize various error and exception classes - turn off for " \ 845 "individual method debugging") \ 846 \ 847 product(bool, RegisterFinalizersAtInit, true, \ 848 "Register finalizable objects at end of Object.<init> or " \ 849 "after allocation") \ 850 \ 851 develop(bool, RegisterReferences, true, \ 852 "Tells whether the VM should register soft/weak/final/phantom " \ 853 "references") \ 854 \ 855 develop(bool, IgnoreRewrites, false, \ 856 "Supress rewrites of bytecodes in the oopmap generator. " \ 857 "This is unsafe!") \ 858 \ 859 develop(bool, PrintCodeCacheExtension, false, \ 860 "Print extension of code cache") \ 861 \ 862 develop(bool, UsePrivilegedStack, true, \ 863 "Enable the security JVM functions") \ 864 \ 865 develop(bool, IEEEPrecision, true, \ 866 "Enables IEEE precision (for INTEL only)") \ 867 \ 868 develop(bool, ProtectionDomainVerification, true, \ 869 "Verifies protection domain before resolution in system " \ 870 "dictionary") \ 871 \ 872 product(bool, ClassUnloading, true, \ 873 "Do unloading of classes") \ 874 \ 875 diagnostic(bool, LinkWellKnownClasses, false, \ 876 "Resolve a well known class as soon as its name is seen") \ 877 \ 878 develop(bool, DisableStartThread, false, \ 879 "Disable starting of additional Java threads " \ 880 "(for debugging only)") \ 881 \ 882 develop(bool, MemProfiling, false, \ 883 "Write memory usage profiling to log file") \ 884 \ 885 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 886 "Prints the system dictionary at exit") \ 887 \ 888 diagnostic(bool, UnsyncloadClass, false, \ 889 "Unstable: VM calls loadClass unsynchronized. Custom " \ 890 "class loader must call VM synchronized for findClass " \ 891 "and defineClass.") \ 892 \ 893 product(bool, AlwaysLockClassLoader, false, \ 894 "Require the VM to acquire the class loader lock before calling " \ 895 "loadClass() even for class loaders registering " \ 896 "as parallel capable") \ 897 \ 898 product(bool, AllowParallelDefineClass, false, \ 899 "Allow parallel defineClass requests for class loaders " \ 900 "registering as parallel capable") \ 901 \ 902 product(bool, MustCallLoadClassInternal, false, \ 903 "Call loadClassInternal() rather than loadClass()") \ 904 \ 905 product_pd(bool, DontYieldALot, \ 906 "Throw away obvious excess yield calls (for SOLARIS only)") \ 907 \ 908 product_pd(bool, ConvertSleepToYield, \ 909 "Converts sleep(0) to thread yield " \ 910 "(may be off for SOLARIS to improve GUI)") \ 911 \ 912 product(bool, ConvertYieldToSleep, false, \ 913 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 914 "behavior (SOLARIS only)") \ 915 \ 916 product(bool, UseBoundThreads, true, \ 917 "Bind user level threads to kernel threads (for SOLARIS only)") \ 918 \ 919 develop(bool, UseDetachedThreads, true, \ 920 "Use detached threads that are recycled upon termination " \ 921 "(for SOLARIS only)") \ 922 \ 923 product(bool, UseLWPSynchronization, true, \ 924 "Use LWP-based instead of libthread-based synchronization " \ 925 "(SPARC only)") \ 926 \ 927 product(ccstr, SyncKnobs, NULL, \ 928 "(Unstable) Various monitor synchronization tunables") \ 929 \ 930 product(intx, EmitSync, 0, \ 931 "(Unsafe,Unstable) " \ 932 " Controls emission of inline sync fast-path code") \ 933 \ 934 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 935 \ 936 product(intx, MonitorBound, 0, "Bound Monitor population") \ 937 \ 938 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 939 \ 940 product(intx, Atomics, 0, \ 941 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 942 \ 943 product(intx, FenceInstruction, 0, \ 944 "(Unsafe,Unstable) Experimental") \ 945 \ 946 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 947 \ 948 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 949 \ 950 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 951 \ 952 product(intx, hashCode, 0, \ 953 "(Unstable) select hashCode generation algorithm" ) \ 954 \ 955 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 956 "(Unstable, Linux-specific)" \ 957 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 958 \ 959 product(bool, FilterSpuriousWakeups, true, \ 960 "Prevent spurious or premature wakeups from object.wait " \ 961 "(Solaris only)") \ 962 \ 963 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 964 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 965 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 966 \ 967 develop(bool, UsePthreads, false, \ 968 "Use pthread-based instead of libthread-based synchronization " \ 969 "(SPARC only)") \ 970 \ 971 product(bool, AdjustConcurrency, false, \ 972 "call thr_setconcurrency at thread create time to avoid " \ 973 "LWP starvation on MP systems (For Solaris Only)") \ 974 \ 975 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 976 "Should the system attempt to update the compiler file when " \ 977 "an error occurs?") \ 978 \ 979 product(bool, ReduceSignalUsage, false, \ 980 "Reduce the use of OS signals in Java and/or the VM") \ 981 \ 982 notproduct(bool, ValidateMarkSweep, false, \ 983 "Do extra validation during MarkSweep collection") \ 984 \ 985 notproduct(bool, RecordMarkSweepCompaction, false, \ 986 "Enable GC-to-GC recording and querying of compaction during " \ 987 "MarkSweep") \ 988 \ 989 develop_pd(bool, ShareVtableStubs, \ 990 "Share vtable stubs (smaller code but worse branch prediction") \ 991 \ 992 develop(bool, LoadLineNumberTables, true, \ 993 "Tells whether the class file parser loads line number tables") \ 994 \ 995 develop(bool, LoadLocalVariableTables, true, \ 996 "Tells whether the class file parser loads local variable tables")\ 997 \ 998 develop(bool, LoadLocalVariableTypeTables, true, \ 999 "Tells whether the class file parser loads local variable type tables")\ 1000 \ 1001 product(bool, AllowUserSignalHandlers, false, \ 1002 "Do not complain if the application installs signal handlers " \ 1003 "(Solaris & Linux only)") \ 1004 \ 1005 product(bool, UseSignalChaining, true, \ 1006 "Use signal-chaining to invoke signal handlers installed " \ 1007 "by the application (Solaris & Linux only)") \ 1008 \ 1009 product(bool, UseAltSigs, false, \ 1010 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1011 "internal signals (Solaris only)") \ 1012 \ 1013 product(bool, UseSpinning, false, \ 1014 "Use spinning in monitor inflation and before entry") \ 1015 \ 1016 product(bool, PreSpinYield, false, \ 1017 "Yield before inner spinning loop") \ 1018 \ 1019 product(bool, PostSpinYield, true, \ 1020 "Yield after inner spinning loop") \ 1021 \ 1022 product(bool, AllowJNIEnvProxy, false, \ 1023 "Allow JNIEnv proxies for jdbx") \ 1024 \ 1025 product(bool, JNIDetachReleasesMonitors, true, \ 1026 "JNI DetachCurrentThread releases monitors owned by thread") \ 1027 \ 1028 product(bool, RestoreMXCSROnJNICalls, false, \ 1029 "Restore MXCSR when returning from JNI calls") \ 1030 \ 1031 product(bool, CheckJNICalls, false, \ 1032 "Verify all arguments to JNI calls") \ 1033 \ 1034 product(bool, UseFastJNIAccessors, true, \ 1035 "Use optimized versions of Get<Primitive>Field") \ 1036 \ 1037 product(bool, EagerXrunInit, false, \ 1038 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1039 " but not all -Xrun libraries may support the state of the VM at this time") \ 1040 \ 1041 product(bool, PreserveAllAnnotations, false, \ 1042 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1043 \ 1044 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1045 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1046 \ 1047 product(bool, LazyBootClassLoader, true, \ 1048 "Enable/disable lazy opening of boot class path entries") \ 1049 \ 1050 diagnostic(bool, UseIncDec, true, \ 1051 "Use INC, DEC instructions on x86") \ 1052 \ 1053 product(bool, UseNewLongLShift, false, \ 1054 "Use optimized bitwise shift left") \ 1055 \ 1056 product(bool, UseStoreImmI16, true, \ 1057 "Use store immediate 16-bits value instruction on x86") \ 1058 \ 1059 product(bool, UseAddressNop, false, \ 1060 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1061 \ 1062 product(bool, UseXmmLoadAndClearUpper, true, \ 1063 "Load low part of XMM register and clear upper part") \ 1064 \ 1065 product(bool, UseXmmRegToRegMoveAll, false, \ 1066 "Copy all XMM register bits when moving value between registers") \ 1067 \ 1068 product(bool, UseXmmI2D, false, \ 1069 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1070 \ 1071 product(bool, UseXmmI2F, false, \ 1072 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1073 \ 1074 product(bool, UseXMMForArrayCopy, false, \ 1075 "Use SSE2 MOVQ instruction for Arraycopy") \ 1076 \ 1077 product(bool, UseUnalignedLoadStores, false, \ 1078 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1079 \ 1080 product(intx, FieldsAllocationStyle, 1, \ 1081 "0 - type based with oops first, 1 - with oops last, " \ 1082 "2 - oops in super and sub classes are together") \ 1083 \ 1084 product(bool, CompactFields, true, \ 1085 "Allocate nonstatic fields in gaps between previous fields") \ 1086 \ 1087 notproduct(bool, PrintCompactFieldsSavings, false, \ 1088 "Print how many words were saved with CompactFields") \ 1089 \ 1090 product(bool, UseBiasedLocking, true, \ 1091 "Enable biased locking in JVM") \ 1092 \ 1093 product(intx, BiasedLockingStartupDelay, 4000, \ 1094 "Number of milliseconds to wait before enabling biased locking") \ 1095 \ 1096 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1097 "Print statistics of biased locking in JVM") \ 1098 \ 1099 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1100 "Threshold of number of revocations per type to try to " \ 1101 "rebias all objects in the heap of that type") \ 1102 \ 1103 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1104 "Threshold of number of revocations per type to permanently " \ 1105 "revoke biases of all objects in the heap of that type") \ 1106 \ 1107 product(intx, BiasedLockingDecayTime, 25000, \ 1108 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1109 "type after previous bulk rebias") \ 1110 \ 1111 /* tracing */ \ 1112 \ 1113 notproduct(bool, TraceRuntimeCalls, false, \ 1114 "Trace run-time calls") \ 1115 \ 1116 develop(bool, TraceJNICalls, false, \ 1117 "Trace JNI calls") \ 1118 \ 1119 notproduct(bool, TraceJVMCalls, false, \ 1120 "Trace JVM calls") \ 1121 \ 1122 product(ccstr, TraceJVMTI, NULL, \ 1123 "Trace flags for JVMTI functions and events") \ 1124 \ 1125 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1126 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1127 \ 1128 /* This option can change an EMCP method into an obsolete method. */ \ 1129 /* This can affect tests that except specific methods to be EMCP. */ \ 1130 /* This option should be used with caution. */ \ 1131 product(bool, StressLdcRewrite, false, \ 1132 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1133 \ 1134 product(intx, TraceRedefineClasses, 0, \ 1135 "Trace level for JVMTI RedefineClasses") \ 1136 \ 1137 develop(bool, StressMethodComparator, false, \ 1138 "run the MethodComparator on all loaded methods") \ 1139 \ 1140 /* change to false by default sometime after Mustang */ \ 1141 product(bool, VerifyMergedCPBytecodes, true, \ 1142 "Verify bytecodes after RedefineClasses constant pool merging") \ 1143 \ 1144 develop(bool, TraceJNIHandleAllocation, false, \ 1145 "Trace allocation/deallocation of JNI handle blocks") \ 1146 \ 1147 develop(bool, TraceThreadEvents, false, \ 1148 "Trace all thread events") \ 1149 \ 1150 develop(bool, TraceBytecodes, false, \ 1151 "Trace bytecode execution") \ 1152 \ 1153 develop(bool, TraceClassInitialization, false, \ 1154 "Trace class initialization") \ 1155 \ 1156 develop(bool, TraceExceptions, false, \ 1157 "Trace exceptions") \ 1158 \ 1159 develop(bool, TraceICs, false, \ 1160 "Trace inline cache changes") \ 1161 \ 1162 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1163 "Trace method invocation counter overflow") \ 1164 \ 1165 develop(bool, TraceInlineCacheClearing, false, \ 1166 "Trace clearing of inline caches in nmethods") \ 1167 \ 1168 develop(bool, TraceDependencies, false, \ 1169 "Trace dependencies") \ 1170 \ 1171 develop(bool, VerifyDependencies, trueInDebug, \ 1172 "Exercise and verify the compilation dependency mechanism") \ 1173 \ 1174 develop(bool, TraceNewOopMapGeneration, false, \ 1175 "Trace OopMapGeneration") \ 1176 \ 1177 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1178 "Trace OopMapGeneration: print detailed cell states") \ 1179 \ 1180 develop(bool, TimeOopMap, false, \ 1181 "Time calls to GenerateOopMap::compute_map() in sum") \ 1182 \ 1183 develop(bool, TimeOopMap2, false, \ 1184 "Time calls to GenerateOopMap::compute_map() individually") \ 1185 \ 1186 develop(bool, TraceMonitorMismatch, false, \ 1187 "Trace monitor matching failures during OopMapGeneration") \ 1188 \ 1189 develop(bool, TraceOopMapRewrites, false, \ 1190 "Trace rewritting of method oops during oop map generation") \ 1191 \ 1192 develop(bool, TraceSafepoint, false, \ 1193 "Trace safepoint operations") \ 1194 \ 1195 develop(bool, TraceICBuffer, false, \ 1196 "Trace usage of IC buffer") \ 1197 \ 1198 develop(bool, TraceCompiledIC, false, \ 1199 "Trace changes of compiled IC") \ 1200 \ 1201 notproduct(bool, TraceZapDeadLocals, false, \ 1202 "Trace zapping dead locals") \ 1203 \ 1204 develop(bool, TraceStartupTime, false, \ 1205 "Trace setup time") \ 1206 \ 1207 develop(bool, TraceHPI, false, \ 1208 "Trace Host Porting Interface (HPI)") \ 1209 \ 1210 product(ccstr, HPILibPath, NULL, \ 1211 "Specify alternate path to HPI library") \ 1212 \ 1213 develop(bool, TraceProtectionDomainVerification, false, \ 1214 "Trace protection domain verifcation") \ 1215 \ 1216 develop(bool, TraceClearedExceptions, false, \ 1217 "Prints when an exception is forcibly cleared") \ 1218 \ 1219 product(bool, TraceClassResolution, false, \ 1220 "Trace all constant pool resolutions (for debugging)") \ 1221 \ 1222 product(bool, TraceBiasedLocking, false, \ 1223 "Trace biased locking in JVM") \ 1224 \ 1225 product(bool, TraceMonitorInflation, false, \ 1226 "Trace monitor inflation in JVM") \ 1227 \ 1228 /* assembler */ \ 1229 product(bool, Use486InstrsOnly, false, \ 1230 "Use 80486 Compliant instruction subset") \ 1231 \ 1232 /* gc */ \ 1233 \ 1234 product(bool, UseSerialGC, false, \ 1235 "Use the serial garbage collector") \ 1236 \ 1237 product(bool, UseG1GC, false, \ 1238 "Use the Garbage-First garbage collector") \ 1239 \ 1240 product(bool, UseParallelGC, false, \ 1241 "Use the Parallel Scavenge garbage collector") \ 1242 \ 1243 product(bool, UseParallelOldGC, false, \ 1244 "Use the Parallel Old garbage collector") \ 1245 \ 1246 product(bool, UseParallelOldGCCompacting, true, \ 1247 "In the Parallel Old garbage collector use parallel compaction") \ 1248 \ 1249 product(bool, UseParallelDensePrefixUpdate, true, \ 1250 "In the Parallel Old garbage collector use parallel dense" \ 1251 " prefix update") \ 1252 \ 1253 product(uintx, HeapMaximumCompactionInterval, 20, \ 1254 "How often should we maximally compact the heap (not allowing " \ 1255 "any dead space)") \ 1256 \ 1257 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1258 "The collection count for the first maximum compaction") \ 1259 \ 1260 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1261 "In the Parallel Old garbage collector maximum compaction for " \ 1262 "a system GC") \ 1263 \ 1264 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1265 "The mean used by the par compact dead wood" \ 1266 "limiter (a number between 0-100).") \ 1267 \ 1268 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1269 "The standard deviation used by the par compact dead wood" \ 1270 "limiter (a number between 0-100).") \ 1271 \ 1272 product(bool, UseParallelOldGCDensePrefix, true, \ 1273 "Use a dense prefix with the Parallel Old garbage collector") \ 1274 \ 1275 product(uintx, ParallelGCThreads, 0, \ 1276 "Number of parallel threads parallel gc will use") \ 1277 \ 1278 develop(bool, ParallelOldGCSplitALot, false, \ 1279 "Provoke splitting (copying data from a young gen space to" \ 1280 "multiple destination spaces)") \ 1281 \ 1282 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1283 "How often to provoke splitting a young gen space") \ 1284 \ 1285 develop(bool, TraceRegionTasksQueuing, false, \ 1286 "Trace the queuing of the region tasks") \ 1287 \ 1288 product(uintx, ConcGCThreads, 0, \ 1289 "Number of threads concurrent gc will use") \ 1290 \ 1291 product(uintx, YoungPLABSize, 4096, \ 1292 "Size of young gen promotion labs (in HeapWords)") \ 1293 \ 1294 product(uintx, OldPLABSize, 1024, \ 1295 "Size of old gen promotion labs (in HeapWords)") \ 1296 \ 1297 product(uintx, GCTaskTimeStampEntries, 200, \ 1298 "Number of time stamp entries per gc worker thread") \ 1299 \ 1300 product(bool, AlwaysTenure, false, \ 1301 "Always tenure objects in eden. (ParallelGC only)") \ 1302 \ 1303 product(bool, NeverTenure, false, \ 1304 "Never tenure objects in eden, May tenure on overflow " \ 1305 "(ParallelGC only)") \ 1306 \ 1307 product(bool, ScavengeBeforeFullGC, true, \ 1308 "Scavenge youngest generation before each full GC, " \ 1309 "used with UseParallelGC") \ 1310 \ 1311 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1312 "Allow scavenges to occur when to_space contains objects.") \ 1313 \ 1314 product(bool, UseConcMarkSweepGC, false, \ 1315 "Use Concurrent Mark-Sweep GC in the old generation") \ 1316 \ 1317 product(bool, ExplicitGCInvokesConcurrent, false, \ 1318 "A System.gc() request invokes a concurrent collection;" \ 1319 " (effective only when UseConcMarkSweepGC)") \ 1320 \ 1321 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1322 "A System.gc() request invokes a concurrent collection and " \ 1323 "also unloads classes during such a concurrent gc cycle " \ 1324 "(effective only when UseConcMarkSweepGC)") \ 1325 \ 1326 product(bool, GCLockerInvokesConcurrent, false, \ 1327 "The exit of a JNI CS necessitating a scavenge also" \ 1328 " kicks off a bkgrd concurrent collection") \ 1329 \ 1330 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1331 "Use Adaptive Free Lists in the CMS generation") \ 1332 \ 1333 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1334 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1335 \ 1336 develop(bool, RotateCMSCollectionTypes, false, \ 1337 "Rotate the CMS collections among concurrent and STW") \ 1338 \ 1339 product(bool, UseCMSBestFit, true, \ 1340 "Use CMS best fit allocation strategy") \ 1341 \ 1342 product(bool, UseCMSCollectionPassing, true, \ 1343 "Use passing of collection from background to foreground") \ 1344 \ 1345 product(bool, UseParNewGC, false, \ 1346 "Use parallel threads in the new generation.") \ 1347 \ 1348 product(bool, ParallelGCVerbose, false, \ 1349 "Verbose output for parallel GC.") \ 1350 \ 1351 product(intx, ParallelGCBufferWastePct, 10, \ 1352 "wasted fraction of parallel allocation buffer.") \ 1353 \ 1354 product(bool, ParallelGCRetainPLAB, true, \ 1355 "Retain parallel allocation buffers across scavenges.") \ 1356 \ 1357 product(intx, TargetPLABWastePct, 10, \ 1358 "target wasted space in last buffer as pct of overall allocation")\ 1359 \ 1360 product(uintx, PLABWeight, 75, \ 1361 "Percentage (0-100) used to weight the current sample when" \ 1362 "computing exponentially decaying average for ResizePLAB.") \ 1363 \ 1364 product(bool, ResizePLAB, true, \ 1365 "Dynamically resize (survivor space) promotion labs") \ 1366 \ 1367 product(bool, PrintPLAB, false, \ 1368 "Print (survivor space) promotion labs sizing decisions") \ 1369 \ 1370 product(intx, ParGCArrayScanChunk, 50, \ 1371 "Scan a subset and push remainder, if array is bigger than this") \ 1372 \ 1373 product(bool, ParGCUseLocalOverflow, false, \ 1374 "Instead of a global overflow list, use local overflow stacks") \ 1375 \ 1376 product(bool, ParGCTrimOverflow, true, \ 1377 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1378 \ 1379 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1380 "Whether we should simulate work queue overflow in ParNew") \ 1381 \ 1382 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1383 "An `interval' counter that determines how frequently " \ 1384 "we simulate overflow; a smaller number increases frequency") \ 1385 \ 1386 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1387 "The desired number of objects to claim from the overflow list") \ 1388 \ 1389 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1390 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1391 "parallel GC.") \ 1392 \ 1393 product(uintx, OldPLABWeight, 50, \ 1394 "Percentage (0-100) used to weight the current sample when" \ 1395 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1396 \ 1397 product(bool, ResizeOldPLAB, true, \ 1398 "Dynamically resize (old gen) promotion labs") \ 1399 \ 1400 product(bool, PrintOldPLAB, false, \ 1401 "Print (old gen) promotion labs sizing decisions") \ 1402 \ 1403 product(uintx, CMSOldPLABMin, 16, \ 1404 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1405 \ 1406 product(uintx, CMSOldPLABMax, 1024, \ 1407 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1408 \ 1409 product(uintx, CMSOldPLABNumRefills, 4, \ 1410 "Nominal number of refills of CMS gen promotion lab cache" \ 1411 " per worker per block size") \ 1412 \ 1413 product(bool, CMSOldPLABResizeQuicker, false, \ 1414 "Whether to react on-the-fly during a scavenge to a sudden" \ 1415 " change in block demand rate") \ 1416 \ 1417 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1418 "The tolerance of the phase-change detector for on-the-fly" \ 1419 " PLAB resizing during a scavenge") \ 1420 \ 1421 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1422 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1423 " during a scavenge") \ 1424 \ 1425 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1426 "The clamping of the gain in the feedback loop for on-the-fly" \ 1427 " PLAB resizing during a scavenge") \ 1428 \ 1429 product(bool, AlwaysPreTouch, false, \ 1430 "It forces all freshly committed pages to be pre-touched.") \ 1431 \ 1432 product(bool, CMSUseOldDefaults, false, \ 1433 "A flag temporarily introduced to allow reverting to some " \ 1434 "older default settings; older as of 6.0") \ 1435 \ 1436 product(intx, CMSYoungGenPerWorker, 16*M, \ 1437 "The amount of young gen chosen by default per GC worker " \ 1438 "thread available") \ 1439 \ 1440 product(bool, GCOverheadReporting, false, \ 1441 "Enables the GC overhead reporting facility") \ 1442 \ 1443 product(intx, GCOverheadReportingPeriodMS, 100, \ 1444 "Reporting period for conc GC overhead reporting, in ms ") \ 1445 \ 1446 product(bool, CMSIncrementalMode, false, \ 1447 "Whether CMS GC should operate in \"incremental\" mode") \ 1448 \ 1449 product(uintx, CMSIncrementalDutyCycle, 10, \ 1450 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1451 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1452 "value") \ 1453 \ 1454 product(bool, CMSIncrementalPacing, true, \ 1455 "Whether the CMS incremental mode duty cycle should be " \ 1456 "automatically adjusted") \ 1457 \ 1458 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1459 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1460 "enabled (a percentage, 0-100)") \ 1461 \ 1462 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1463 "Percentage (0-100) used to add conservatism when computing the " \ 1464 "duty cycle") \ 1465 \ 1466 product(uintx, CMSIncrementalOffset, 0, \ 1467 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1468 " is shifted to the right within the period between young GCs") \ 1469 \ 1470 product(uintx, CMSExpAvgFactor, 50, \ 1471 "Percentage (0-100) used to weight the current sample when" \ 1472 "computing exponential averages for CMS statistics.") \ 1473 \ 1474 product(uintx, CMS_FLSWeight, 75, \ 1475 "Percentage (0-100) used to weight the current sample when" \ 1476 "computing exponentially decating averages for CMS FLS statistics.") \ 1477 \ 1478 product(uintx, CMS_FLSPadding, 1, \ 1479 "The multiple of deviation from mean to use for buffering" \ 1480 "against volatility in free list demand.") \ 1481 \ 1482 product(uintx, FLSCoalescePolicy, 2, \ 1483 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1484 \ 1485 product(bool, FLSAlwaysCoalesceLarge, false, \ 1486 "CMS: Larger free blocks are always available for coalescing") \ 1487 \ 1488 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1489 "CMS: the smaller the percentage the greater the coalition force")\ 1490 \ 1491 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1492 "CMS: the factor by which to inflate estimated demand of small" \ 1493 " block sizes to prevent coalescing with an adjoining block") \ 1494 \ 1495 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1496 "CMS: the factor by which to inflate estimated demand of large" \ 1497 " block sizes to prevent coalescing with an adjoining block") \ 1498 \ 1499 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1500 "CMS: the factor by which to inflate estimated demand of small" \ 1501 " block sizes to prevent splitting to supply demand for smaller" \ 1502 " blocks") \ 1503 \ 1504 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1505 "CMS: the factor by which to inflate estimated demand of large" \ 1506 " block sizes to prevent splitting to supply demand for smaller" \ 1507 " blocks") \ 1508 \ 1509 product(bool, CMSExtrapolateSweep, false, \ 1510 "CMS: cushion for block demand during sweep") \ 1511 \ 1512 product(uintx, CMS_SweepWeight, 75, \ 1513 "Percentage (0-100) used to weight the current sample when " \ 1514 "computing exponentially decaying average for inter-sweep " \ 1515 "duration") \ 1516 \ 1517 product(uintx, CMS_SweepPadding, 1, \ 1518 "The multiple of deviation from mean to use for buffering " \ 1519 "against volatility in inter-sweep duration.") \ 1520 \ 1521 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1522 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1523 "duration exceeds this threhold in milliseconds") \ 1524 \ 1525 develop(bool, CMSTraceIncrementalMode, false, \ 1526 "Trace CMS incremental mode") \ 1527 \ 1528 develop(bool, CMSTraceIncrementalPacing, false, \ 1529 "Trace CMS incremental mode pacing computation") \ 1530 \ 1531 develop(bool, CMSTraceThreadState, false, \ 1532 "Trace the CMS thread state (enable the trace_state() method)") \ 1533 \ 1534 product(bool, CMSClassUnloadingEnabled, false, \ 1535 "Whether class unloading enabled when using CMS GC") \ 1536 \ 1537 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1538 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1539 " for which classes may not be unloaded") \ 1540 \ 1541 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1542 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1543 \ 1544 product(bool, UseCMSCompactAtFullCollection, true, \ 1545 "Use mark sweep compact at full collections") \ 1546 \ 1547 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1548 "Number of CMS full collection done before compaction if > 0") \ 1549 \ 1550 develop(intx, CMSDictionaryChoice, 0, \ 1551 "Use BinaryTreeDictionary as default in the CMS generation") \ 1552 \ 1553 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1554 "Replenish an indexed free list with this number of chunks") \ 1555 \ 1556 product(bool, CMSReplenishIntermediate, true, \ 1557 "Replenish all intermediate free-list caches") \ 1558 \ 1559 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1560 "When satisfying batched demand, split blocks from the " \ 1561 "IndexedFreeList whose size is a multiple of requested size") \ 1562 \ 1563 product(bool, CMSLoopWarn, false, \ 1564 "Warn in case of excessive CMS looping") \ 1565 \ 1566 develop(bool, CMSOverflowEarlyRestoration, false, \ 1567 "Whether preserved marks should be restored early") \ 1568 \ 1569 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1570 "Size of marking stack") \ 1571 \ 1572 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1573 "Max size of marking stack") \ 1574 \ 1575 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1576 "Whether we should simulate frequent marking stack / work queue" \ 1577 " overflow") \ 1578 \ 1579 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1580 "An `interval' counter that determines how frequently" \ 1581 " we simulate overflow; a smaller number increases frequency") \ 1582 \ 1583 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1584 "(Temporary, subject to experimentation)" \ 1585 "Maximum number of abortable preclean iterations, if > 0") \ 1586 \ 1587 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1588 "(Temporary, subject to experimentation)" \ 1589 "Maximum time in abortable preclean in ms") \ 1590 \ 1591 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1592 "(Temporary, subject to experimentation)" \ 1593 "Nominal minimum work per abortable preclean iteration") \ 1594 \ 1595 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1596 "(Temporary, subject to experimentation)" \ 1597 " Time that we sleep between iterations when not given" \ 1598 " enough work per iteration") \ 1599 \ 1600 product(uintx, CMSRescanMultiple, 32, \ 1601 "Size (in cards) of CMS parallel rescan task") \ 1602 \ 1603 product(uintx, CMSConcMarkMultiple, 32, \ 1604 "Size (in cards) of CMS concurrent MT marking task") \ 1605 \ 1606 product(uintx, CMSRevisitStackSize, 1*M, \ 1607 "Size of CMS KlassKlass revisit stack") \ 1608 \ 1609 product(bool, CMSAbortSemantics, false, \ 1610 "Whether abort-on-overflow semantics is implemented") \ 1611 \ 1612 product(bool, CMSParallelRemarkEnabled, true, \ 1613 "Whether parallel remark enabled (only if ParNewGC)") \ 1614 \ 1615 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1616 "Whether parallel remark of survivor space" \ 1617 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1618 \ 1619 product(bool, CMSPLABRecordAlways, true, \ 1620 "Whether to always record survivor space PLAB bdries" \ 1621 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1622 \ 1623 product(bool, CMSConcurrentMTEnabled, true, \ 1624 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1625 \ 1626 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1627 "Whether concurrent precleaning enabled in perm gen" \ 1628 " (effective only when CMSPrecleaningEnabled is true)") \ 1629 \ 1630 product(bool, CMSPrecleaningEnabled, true, \ 1631 "Whether concurrent precleaning enabled") \ 1632 \ 1633 product(uintx, CMSPrecleanIter, 3, \ 1634 "Maximum number of precleaning iteration passes") \ 1635 \ 1636 product(uintx, CMSPrecleanNumerator, 2, \ 1637 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1638 " ratio") \ 1639 \ 1640 product(uintx, CMSPrecleanDenominator, 3, \ 1641 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1642 " ratio") \ 1643 \ 1644 product(bool, CMSPrecleanRefLists1, true, \ 1645 "Preclean ref lists during (initial) preclean phase") \ 1646 \ 1647 product(bool, CMSPrecleanRefLists2, false, \ 1648 "Preclean ref lists during abortable preclean phase") \ 1649 \ 1650 product(bool, CMSPrecleanSurvivors1, false, \ 1651 "Preclean survivors during (initial) preclean phase") \ 1652 \ 1653 product(bool, CMSPrecleanSurvivors2, true, \ 1654 "Preclean survivors during abortable preclean phase") \ 1655 \ 1656 product(uintx, CMSPrecleanThreshold, 1000, \ 1657 "Don't re-iterate if #dirty cards less than this") \ 1658 \ 1659 product(bool, CMSCleanOnEnter, true, \ 1660 "Clean-on-enter optimization for reducing number of dirty cards") \ 1661 \ 1662 product(uintx, CMSRemarkVerifyVariant, 1, \ 1663 "Choose variant (1,2) of verification following remark") \ 1664 \ 1665 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1666 "If Eden used is below this value, don't try to schedule remark") \ 1667 \ 1668 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1669 "The Eden occupancy % at which to try and schedule remark pause") \ 1670 \ 1671 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1672 "Start sampling Eden top at least before yg occupancy reaches" \ 1673 " 1/<ratio> of the size at which we plan to schedule remark") \ 1674 \ 1675 product(uintx, CMSSamplingGrain, 16*K, \ 1676 "The minimum distance between eden samples for CMS (see above)") \ 1677 \ 1678 product(bool, CMSScavengeBeforeRemark, false, \ 1679 "Attempt scavenge before the CMS remark step") \ 1680 \ 1681 develop(bool, CMSTraceSweeper, false, \ 1682 "Trace some actions of the CMS sweeper") \ 1683 \ 1684 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1685 "Don't drain below this size per parallel worker/thief") \ 1686 \ 1687 product(intx, CMSWaitDuration, 2000, \ 1688 "Time in milliseconds that CMS thread waits for young GC") \ 1689 \ 1690 product(bool, CMSYield, true, \ 1691 "Yield between steps of concurrent mark & sweep") \ 1692 \ 1693 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1694 "Bitmap operations should process at most this many bits" \ 1695 "between yields") \ 1696 \ 1697 product(bool, CMSDumpAtPromotionFailure, false, \ 1698 "Dump useful information about the state of the CMS old " \ 1699 " generation upon a promotion failure.") \ 1700 \ 1701 product(bool, CMSPrintChunksInDump, false, \ 1702 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1703 " more detailed information about the free chunks.") \ 1704 \ 1705 product(bool, CMSPrintObjectsInDump, false, \ 1706 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1707 " more detailed information about the allocated objects.") \ 1708 \ 1709 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1710 "Verify that all refs across the FLS boundary " \ 1711 " are to valid objects") \ 1712 \ 1713 diagnostic(bool, FLSVerifyLists, false, \ 1714 "Do lots of (expensive) FreeListSpace verification") \ 1715 \ 1716 diagnostic(bool, FLSVerifyIndexTable, false, \ 1717 "Do lots of (expensive) FLS index table verification") \ 1718 \ 1719 develop(bool, FLSVerifyDictionary, false, \ 1720 "Do lots of (expensive) FLS dictionary verification") \ 1721 \ 1722 develop(bool, VerifyBlockOffsetArray, false, \ 1723 "Do (expensive!) block offset array verification") \ 1724 \ 1725 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1726 "Maintain _unallocated_block in BlockOffsetArray" \ 1727 " (currently applicable only to CMS collector)") \ 1728 \ 1729 develop(bool, TraceCMSState, false, \ 1730 "Trace the state of the CMS collection") \ 1731 \ 1732 product(intx, RefDiscoveryPolicy, 0, \ 1733 "Whether reference-based(0) or referent-based(1)") \ 1734 \ 1735 product(bool, ParallelRefProcEnabled, false, \ 1736 "Enable parallel reference processing whenever possible") \ 1737 \ 1738 product(bool, ParallelRefProcBalancingEnabled, true, \ 1739 "Enable balancing of reference processing queues") \ 1740 \ 1741 product(intx, CMSTriggerRatio, 80, \ 1742 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1743 "allocated before a CMS collection cycle commences") \ 1744 \ 1745 product(intx, CMSTriggerPermRatio, 80, \ 1746 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1747 "is allocated before a CMS collection cycle commences, that " \ 1748 "also collects the perm generation") \ 1749 \ 1750 product(uintx, CMSBootstrapOccupancy, 50, \ 1751 "Percentage CMS generation occupancy at which to " \ 1752 "initiate CMS collection for bootstrapping collection stats") \ 1753 \ 1754 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1755 "Percentage CMS generation occupancy to start a CMS collection " \ 1756 "cycle. A negative value means that CMSTriggerRatio is used") \ 1757 \ 1758 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1759 "Percentage of the (entire) heap occupancy to start a " \ 1760 "concurrent GC cycle. It us used by GCs that trigger a " \ 1761 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1762 "not just one of the generations (e.g., G1). A value of 0 " \ 1763 "denotes 'do constant GC cycles'.") \ 1764 \ 1765 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1766 "Percentage CMS perm generation occupancy to start a " \ 1767 "CMScollection cycle. A negative value means that " \ 1768 "CMSTriggerPermRatio is used") \ 1769 \ 1770 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1771 "Only use occupancy as a crierion for starting a CMS collection") \ 1772 \ 1773 product(intx, CMSIsTooFullPercentage, 98, \ 1774 "An absolute ceiling above which CMS will always consider the " \ 1775 "perm gen ripe for collection") \ 1776 \ 1777 develop(bool, CMSTestInFreeList, false, \ 1778 "Check if the coalesced range is already in the " \ 1779 "free lists as claimed") \ 1780 \ 1781 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1782 "Check that all the garbage collected was returned to the " \ 1783 "free lists.") \ 1784 \ 1785 notproduct(bool, ScavengeALot, false, \ 1786 "Force scavenge at every Nth exit from the runtime system " \ 1787 "(N=ScavengeALotInterval)") \ 1788 \ 1789 develop(bool, FullGCALot, false, \ 1790 "Force full gc at every Nth exit from the runtime system " \ 1791 "(N=FullGCALotInterval)") \ 1792 \ 1793 notproduct(bool, GCALotAtAllSafepoints, false, \ 1794 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1795 \ 1796 product(bool, HandlePromotionFailure, true, \ 1797 "The youngest generation collection does not require " \ 1798 "a guarantee of full promotion of all live objects.") \ 1799 \ 1800 product(bool, PrintPromotionFailure, false, \ 1801 "Print additional diagnostic information following " \ 1802 " promotion failure") \ 1803 \ 1804 notproduct(bool, PromotionFailureALot, false, \ 1805 "Use promotion failure handling on every youngest generation " \ 1806 "collection") \ 1807 \ 1808 develop(uintx, PromotionFailureALotCount, 1000, \ 1809 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1810 "refill attempts (ParNew) or promotion attempts " \ 1811 "(other young collectors) ") \ 1812 \ 1813 develop(uintx, PromotionFailureALotInterval, 5, \ 1814 "Total collections between promotion failures alot") \ 1815 \ 1816 experimental(intx, WorkStealingSleepMillis, 1, \ 1817 "Sleep time when sleep is used for yields") \ 1818 \ 1819 experimental(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1820 "Number of yields before a sleep is done during workstealing") \ 1821 \ 1822 experimental(uintx, WorkStealingHardSpins, 4096, \ 1823 "Number of iterations in a spin loop between checks on " \ 1824 "time out of hard spin") \ 1825 \ 1826 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1827 "Ratio of hard spins to calls to yield") \ 1828 \ 1829 product(uintx, PreserveMarkStackSize, 1024, \ 1830 "Size for stack used in promotion failure handling") \ 1831 \ 1832 develop(uintx, ObjArrayMarkingStride, 512, \ 1833 "Number of ObjArray elements to push onto the marking stack" \ 1834 "before pushing a continuation entry") \ 1835 \ 1836 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1837 \ 1838 product_pd(bool, ResizeTLAB, \ 1839 "Dynamically resize tlab size for threads") \ 1840 \ 1841 product(bool, ZeroTLAB, false, \ 1842 "Zero out the newly created TLAB") \ 1843 \ 1844 product(bool, FastTLABRefill, true, \ 1845 "Use fast TLAB refill code") \ 1846 \ 1847 product(bool, PrintTLAB, false, \ 1848 "Print various TLAB related information") \ 1849 \ 1850 product(bool, TLABStats, true, \ 1851 "Print various TLAB related information") \ 1852 \ 1853 product(bool, PrintRevisitStats, false, \ 1854 "Print revisit (klass and MDO) stack related information") \ 1855 \ 1856 product_pd(bool, NeverActAsServerClassMachine, \ 1857 "Never act like a server-class machine") \ 1858 \ 1859 product(bool, AlwaysActAsServerClassMachine, false, \ 1860 "Always act like a server-class machine") \ 1861 \ 1862 product_pd(uint64_t, MaxRAM, \ 1863 "Real memory size (in bytes) used to set maximum heap size") \ 1864 \ 1865 product(uintx, ErgoHeapSizeLimit, 0, \ 1866 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1867 "MaxRAM / MaxRAMFraction") \ 1868 \ 1869 product(uintx, MaxRAMFraction, 4, \ 1870 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1871 "size") \ 1872 \ 1873 product(uintx, DefaultMaxRAMFraction, 4, \ 1874 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1875 "size; deprecated: to be renamed to MaxRAMFraction") \ 1876 \ 1877 product(uintx, MinRAMFraction, 2, \ 1878 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1879 "size on systems with small physical memory size") \ 1880 \ 1881 product(uintx, InitialRAMFraction, 64, \ 1882 "Fraction (1/n) of real memory used for initial heap size") \ 1883 \ 1884 product(bool, UseAutoGCSelectPolicy, false, \ 1885 "Use automatic collection selection policy") \ 1886 \ 1887 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1888 "Automatic GC selection pause threshhold in ms") \ 1889 \ 1890 product(bool, UseAdaptiveSizePolicy, true, \ 1891 "Use adaptive generation sizing policies") \ 1892 \ 1893 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1894 "Use adaptive survivor sizing policies") \ 1895 \ 1896 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1897 "Use adaptive young-old sizing policies at minor collections") \ 1898 \ 1899 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1900 "Use adaptive young-old sizing policies at major collections") \ 1901 \ 1902 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1903 "Use statistics from System.GC for adaptive size policy") \ 1904 \ 1905 product(bool, UseAdaptiveGCBoundary, false, \ 1906 "Allow young-old boundary to move") \ 1907 \ 1908 develop(bool, TraceAdaptiveGCBoundary, false, \ 1909 "Trace young-old boundary moves") \ 1910 \ 1911 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1912 "Resize the virtual spaces of the young or old generations") \ 1913 \ 1914 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1915 "Policy for changeing generation size for throughput goals") \ 1916 \ 1917 product(uintx, AdaptiveSizePausePolicy, 0, \ 1918 "Policy for changing generation size for pause goals") \ 1919 \ 1920 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1921 "Adjust tenured generation to achive a minor pause goal") \ 1922 \ 1923 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1924 "Adjust young generation to achive a major pause goal") \ 1925 \ 1926 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1927 "Number of steps where heuristics is used before data is used") \ 1928 \ 1929 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1930 "Number of collections before the adaptive sizing is started") \ 1931 \ 1932 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1933 "Collecton interval for printing information; zero => never") \ 1934 \ 1935 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1936 "Use adaptive minimum footprint as a goal") \ 1937 \ 1938 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1939 "Weight given to exponential resizing, between 0 and 100") \ 1940 \ 1941 product(uintx, AdaptiveTimeWeight, 25, \ 1942 "Weight given to time in adaptive policy, between 0 and 100") \ 1943 \ 1944 product(uintx, PausePadding, 1, \ 1945 "How much buffer to keep for pause time") \ 1946 \ 1947 product(uintx, PromotedPadding, 3, \ 1948 "How much buffer to keep for promotion failure") \ 1949 \ 1950 product(uintx, SurvivorPadding, 3, \ 1951 "How much buffer to keep for survivor overflow") \ 1952 \ 1953 product(uintx, AdaptivePermSizeWeight, 20, \ 1954 "Weight for perm gen exponential resizing, between 0 and 100") \ 1955 \ 1956 product(uintx, PermGenPadding, 3, \ 1957 "How much buffer to keep for perm gen sizing") \ 1958 \ 1959 product(uintx, ThresholdTolerance, 10, \ 1960 "Allowed collection cost difference between generations") \ 1961 \ 1962 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1963 "If collection costs are within margin, reduce both by full " \ 1964 "delta") \ 1965 \ 1966 product(uintx, YoungGenerationSizeIncrement, 20, \ 1967 "Adaptive size percentage change in young generation") \ 1968 \ 1969 product(uintx, YoungGenerationSizeSupplement, 80, \ 1970 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1971 \ 1972 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1973 "Decay factor to YoungedGenerationSizeSupplement") \ 1974 \ 1975 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1976 "Adaptive size percentage change in tenured generation") \ 1977 \ 1978 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1979 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1980 \ 1981 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1982 "Decay factor to TenuredGenerationSizeIncrement") \ 1983 \ 1984 product(uintx, MaxGCPauseMillis, max_uintx, \ 1985 "Adaptive size policy maximum GC pause time goal in msec, " \ 1986 "or (G1 Only) the max. GC time per MMU time slice") \ 1987 \ 1988 product(uintx, GCPauseIntervalMillis, 0, \ 1989 "Time slice for MMU specification") \ 1990 \ 1991 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1992 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1993 \ 1994 product(uintx, GCTimeRatio, 99, \ 1995 "Adaptive size policy application time to GC time ratio") \ 1996 \ 1997 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1998 "Adaptive size scale down factor for shrinking") \ 1999 \ 2000 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2001 "Adaptive size decays the major cost for long major intervals") \ 2002 \ 2003 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2004 "Time scale over which major costs decay") \ 2005 \ 2006 product(uintx, MinSurvivorRatio, 3, \ 2007 "Minimum ratio of young generation/survivor space size") \ 2008 \ 2009 product(uintx, InitialSurvivorRatio, 8, \ 2010 "Initial ratio of eden/survivor space size") \ 2011 \ 2012 product(uintx, BaseFootPrintEstimate, 256*M, \ 2013 "Estimate of footprint other than Java Heap") \ 2014 \ 2015 product(bool, UseGCOverheadLimit, true, \ 2016 "Use policy to limit of proportion of time spent in GC " \ 2017 "before an OutOfMemory error is thrown") \ 2018 \ 2019 product(uintx, GCTimeLimit, 98, \ 2020 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2021 "error is thrown (used with GCHeapFreeLimit)") \ 2022 \ 2023 product(uintx, GCHeapFreeLimit, 2, \ 2024 "Minimum percentage of free space after a full GC before an " \ 2025 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2026 \ 2027 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2028 "Number of consecutive collections before gc time limit fires") \ 2029 \ 2030 product(bool, PrintAdaptiveSizePolicy, false, \ 2031 "Print information about AdaptiveSizePolicy") \ 2032 \ 2033 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2034 "How far ahead to prefetch destination area (<= 0 means off)") \ 2035 \ 2036 product(intx, PrefetchScanIntervalInBytes, -1, \ 2037 "How far ahead to prefetch scan area (<= 0 means off)") \ 2038 \ 2039 product(intx, PrefetchFieldsAhead, -1, \ 2040 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2041 \ 2042 develop(bool, UsePrefetchQueue, true, \ 2043 "Use the prefetch queue during PS promotion") \ 2044 \ 2045 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2046 "Verify system before exiting") \ 2047 \ 2048 diagnostic(bool, VerifyBeforeGC, false, \ 2049 "Verify memory system before GC") \ 2050 \ 2051 diagnostic(bool, VerifyAfterGC, false, \ 2052 "Verify memory system after GC") \ 2053 \ 2054 diagnostic(bool, VerifyDuringGC, false, \ 2055 "Verify memory system during GC (between phases)") \ 2056 \ 2057 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2058 "Enable parallel memory system verification") \ 2059 \ 2060 diagnostic(bool, DeferInitialCardMark, false, \ 2061 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2062 "may arise from new_pre_store_barrier") \ 2063 \ 2064 diagnostic(bool, VerifyRememberedSets, false, \ 2065 "Verify GC remembered sets") \ 2066 \ 2067 diagnostic(bool, VerifyObjectStartArray, true, \ 2068 "Verify GC object start array if verify before/after") \ 2069 \ 2070 product(bool, DisableExplicitGC, false, \ 2071 "Tells whether calling System.gc() does a full GC") \ 2072 \ 2073 notproduct(bool, CheckMemoryInitialization, false, \ 2074 "Checks memory initialization") \ 2075 \ 2076 product(bool, CollectGen0First, false, \ 2077 "Collect youngest generation before each full GC") \ 2078 \ 2079 diagnostic(bool, BindCMSThreadToCPU, false, \ 2080 "Bind CMS Thread to CPU if possible") \ 2081 \ 2082 diagnostic(uintx, CPUForCMSThread, 0, \ 2083 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2084 \ 2085 product(bool, BindGCTaskThreadsToCPUs, false, \ 2086 "Bind GCTaskThreads to CPUs if possible") \ 2087 \ 2088 product(bool, UseGCTaskAffinity, false, \ 2089 "Use worker affinity when asking for GCTasks") \ 2090 \ 2091 product(uintx, ProcessDistributionStride, 4, \ 2092 "Stride through processors when distributing processes") \ 2093 \ 2094 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2095 "number of times the coordinator GC thread will sleep while " \ 2096 "yielding before giving up and resuming GC") \ 2097 \ 2098 product(uintx, CMSYieldSleepCount, 0, \ 2099 "number of times a GC thread (minus the coordinator) " \ 2100 "will sleep while yielding before giving up and resuming GC") \ 2101 \ 2102 /* gc tracing */ \ 2103 manageable(bool, PrintGC, false, \ 2104 "Print message at garbage collect") \ 2105 \ 2106 manageable(bool, PrintGCDetails, false, \ 2107 "Print more details at garbage collect") \ 2108 \ 2109 manageable(bool, PrintGCDateStamps, false, \ 2110 "Print date stamps at garbage collect") \ 2111 \ 2112 manageable(bool, PrintGCTimeStamps, false, \ 2113 "Print timestamps at garbage collect") \ 2114 \ 2115 product(bool, PrintGCTaskTimeStamps, false, \ 2116 "Print timestamps for individual gc worker thread tasks") \ 2117 \ 2118 develop(intx, ConcGCYieldTimeout, 0, \ 2119 "If non-zero, assert that GC threads yield within this # of ms.") \ 2120 \ 2121 notproduct(bool, TraceMarkSweep, false, \ 2122 "Trace mark sweep") \ 2123 \ 2124 product(bool, PrintReferenceGC, false, \ 2125 "Print times spent handling reference objects during GC " \ 2126 " (enabled only when PrintGCDetails)") \ 2127 \ 2128 develop(bool, TraceReferenceGC, false, \ 2129 "Trace handling of soft/weak/final/phantom references") \ 2130 \ 2131 develop(bool, TraceFinalizerRegistration, false, \ 2132 "Trace registration of final references") \ 2133 \ 2134 notproduct(bool, TraceScavenge, false, \ 2135 "Trace scavenge") \ 2136 \ 2137 product_rw(bool, TraceClassLoading, false, \ 2138 "Trace all classes loaded") \ 2139 \ 2140 product(bool, TraceClassLoadingPreorder, false, \ 2141 "Trace all classes loaded in order referenced (not loaded)") \ 2142 \ 2143 product_rw(bool, TraceClassUnloading, false, \ 2144 "Trace unloading of classes") \ 2145 \ 2146 product_rw(bool, TraceLoaderConstraints, false, \ 2147 "Trace loader constraints") \ 2148 \ 2149 product(bool, TraceGen0Time, false, \ 2150 "Trace accumulated time for Gen 0 collection") \ 2151 \ 2152 product(bool, TraceGen1Time, false, \ 2153 "Trace accumulated time for Gen 1 collection") \ 2154 \ 2155 product(bool, PrintTenuringDistribution, false, \ 2156 "Print tenuring age information") \ 2157 \ 2158 product_rw(bool, PrintHeapAtGC, false, \ 2159 "Print heap layout before and after each GC") \ 2160 \ 2161 product_rw(bool, PrintHeapAtGCExtended, false, \ 2162 "Prints extended information about the layout of the heap " \ 2163 "when -XX:+PrintHeapAtGC is set") \ 2164 \ 2165 product(bool, PrintHeapAtSIGBREAK, true, \ 2166 "Print heap layout in response to SIGBREAK") \ 2167 \ 2168 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2169 "Print a class histogram before any major stop-world GC") \ 2170 \ 2171 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2172 "Print a class histogram after any major stop-world GC") \ 2173 \ 2174 manageable(bool, PrintClassHistogram, false, \ 2175 "Print a histogram of class instances") \ 2176 \ 2177 develop(bool, TraceWorkGang, false, \ 2178 "Trace activities of work gangs") \ 2179 \ 2180 product(bool, TraceParallelOldGCTasks, false, \ 2181 "Trace multithreaded GC activity") \ 2182 \ 2183 develop(bool, TraceBlockOffsetTable, false, \ 2184 "Print BlockOffsetTable maps") \ 2185 \ 2186 develop(bool, TraceCardTableModRefBS, false, \ 2187 "Print CardTableModRefBS maps") \ 2188 \ 2189 develop(bool, TraceGCTaskManager, false, \ 2190 "Trace actions of the GC task manager") \ 2191 \ 2192 develop(bool, TraceGCTaskQueue, false, \ 2193 "Trace actions of the GC task queues") \ 2194 \ 2195 develop(bool, TraceGCTaskThread, false, \ 2196 "Trace actions of the GC task threads") \ 2197 \ 2198 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2199 "Print the time taken by each parallel old gc phase." \ 2200 "PrintGCDetails must also be enabled.") \ 2201 \ 2202 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2203 "Trace parallel old gc marking phase") \ 2204 \ 2205 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2206 "Trace parallel old gc summary phase") \ 2207 \ 2208 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2209 "Trace parallel old gc compaction phase") \ 2210 \ 2211 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2212 "Trace parallel old gc dense prefix computation") \ 2213 \ 2214 develop(bool, IgnoreLibthreadGPFault, false, \ 2215 "Suppress workaround for libthread GP fault") \ 2216 \ 2217 product(bool, PrintJNIGCStalls, false, \ 2218 "Print diagnostic message when GC is stalled" \ 2219 "by JNI critical section") \ 2220 \ 2221 /* JVMTI heap profiling */ \ 2222 \ 2223 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2224 "Trace JVMTI object tagging calls") \ 2225 \ 2226 diagnostic(bool, VerifyBeforeIteration, false, \ 2227 "Verify memory system before JVMTI iteration") \ 2228 \ 2229 /* compiler interface */ \ 2230 \ 2231 develop(bool, CIPrintCompilerName, false, \ 2232 "when CIPrint is active, print the name of the active compiler") \ 2233 \ 2234 develop(bool, CIPrintCompileQueue, false, \ 2235 "display the contents of the compile queue whenever a " \ 2236 "compilation is enqueued") \ 2237 \ 2238 develop(bool, CIPrintRequests, false, \ 2239 "display every request for compilation") \ 2240 \ 2241 product(bool, CITime, false, \ 2242 "collect timing information for compilation") \ 2243 \ 2244 develop(bool, CITimeEach, false, \ 2245 "display timing information after each successful compilation") \ 2246 \ 2247 develop(bool, CICountOSR, true, \ 2248 "use a separate counter when assigning ids to osr compilations") \ 2249 \ 2250 develop(bool, CICompileNatives, true, \ 2251 "compile native methods if supported by the compiler") \ 2252 \ 2253 develop_pd(bool, CICompileOSR, \ 2254 "compile on stack replacement methods if supported by the " \ 2255 "compiler") \ 2256 \ 2257 develop(bool, CIPrintMethodCodes, false, \ 2258 "print method bytecodes of the compiled code") \ 2259 \ 2260 develop(bool, CIPrintTypeFlow, false, \ 2261 "print the results of ciTypeFlow analysis") \ 2262 \ 2263 develop(bool, CITraceTypeFlow, false, \ 2264 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2265 \ 2266 develop(intx, CICloneLoopTestLimit, 100, \ 2267 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2268 \ 2269 /* temp diagnostics */ \ 2270 \ 2271 diagnostic(bool, TraceRedundantCompiles, false, \ 2272 "Have compile broker print when a request already in the queue is"\ 2273 " requested again") \ 2274 \ 2275 diagnostic(bool, InitialCompileFast, false, \ 2276 "Initial compile at CompLevel_fast_compile") \ 2277 \ 2278 diagnostic(bool, InitialCompileReallyFast, false, \ 2279 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2280 \ 2281 diagnostic(bool, FullProfileOnReInterpret, true, \ 2282 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2283 \ 2284 /* compiler */ \ 2285 \ 2286 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2287 "Number of compiler threads to run") \ 2288 \ 2289 product(intx, CompilationPolicyChoice, 0, \ 2290 "which compilation policy (0/1)") \ 2291 \ 2292 develop(bool, UseStackBanging, true, \ 2293 "use stack banging for stack overflow checks (required for " \ 2294 "proper StackOverflow handling; disable only to measure cost " \ 2295 "of stackbanging)") \ 2296 \ 2297 develop(bool, Use24BitFPMode, true, \ 2298 "Set 24-bit FPU mode on a per-compile basis ") \ 2299 \ 2300 develop(bool, Use24BitFP, true, \ 2301 "use FP instructions that produce 24-bit precise results") \ 2302 \ 2303 develop(bool, UseStrictFP, true, \ 2304 "use strict fp if modifier strictfp is set") \ 2305 \ 2306 develop(bool, GenerateSynchronizationCode, true, \ 2307 "generate locking/unlocking code for synchronized methods and " \ 2308 "monitors") \ 2309 \ 2310 develop(bool, GenerateCompilerNullChecks, true, \ 2311 "Generate explicit null checks for loads/stores/calls") \ 2312 \ 2313 develop(bool, GenerateRangeChecks, true, \ 2314 "Generate range checks for array accesses") \ 2315 \ 2316 develop_pd(bool, ImplicitNullChecks, \ 2317 "generate code for implicit null checks") \ 2318 \ 2319 product(bool, PrintSafepointStatistics, false, \ 2320 "print statistics about safepoint synchronization") \ 2321 \ 2322 product(intx, PrintSafepointStatisticsCount, 300, \ 2323 "total number of safepoint statistics collected " \ 2324 "before printing them out") \ 2325 \ 2326 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2327 "print safepoint statistics only when safepoint takes" \ 2328 " more than PrintSafepointSatisticsTimeout in millis") \ 2329 \ 2330 product(bool, TraceSafepointCleanupTime, false, \ 2331 "print the break down of clean up tasks performed during" \ 2332 " safepoint") \ 2333 \ 2334 develop(bool, InlineAccessors, true, \ 2335 "inline accessor methods (get/set)") \ 2336 \ 2337 product(bool, Inline, true, \ 2338 "enable inlining") \ 2339 \ 2340 product(bool, ClipInlining, true, \ 2341 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2342 \ 2343 develop(bool, UseCHA, true, \ 2344 "enable CHA") \ 2345 \ 2346 product(bool, UseTypeProfile, true, \ 2347 "Check interpreter profile for historically monomorphic calls") \ 2348 \ 2349 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2350 "% of major receiver type to all profiled receivers") \ 2351 \ 2352 notproduct(bool, TimeCompiler, false, \ 2353 "time the compiler") \ 2354 \ 2355 notproduct(bool, TimeCompiler2, false, \ 2356 "detailed time the compiler (requires +TimeCompiler)") \ 2357 \ 2358 diagnostic(bool, PrintInlining, false, \ 2359 "prints inlining optimizations") \ 2360 \ 2361 diagnostic(bool, PrintIntrinsics, false, \ 2362 "prints attempted and successful inlining of intrinsics") \ 2363 \ 2364 product(bool, UseCountLeadingZerosInstruction, false, \ 2365 "Use count leading zeros instruction") \ 2366 \ 2367 product(bool, UsePopCountInstruction, false, \ 2368 "Use population count instruction") \ 2369 \ 2370 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2371 "do not expand intrinsics whose (internal) names appear here") \ 2372 \ 2373 develop(bool, StressReflectiveCode, false, \ 2374 "Use inexact types at allocations, etc., to test reflection") \ 2375 \ 2376 develop(bool, EagerInitialization, false, \ 2377 "Eagerly initialize classes if possible") \ 2378 \ 2379 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2380 "Update methodDataOops in Tier1-generated code") \ 2381 \ 2382 develop(bool, TraceMethodReplacement, false, \ 2383 "Print when methods are replaced do to recompilation") \ 2384 \ 2385 develop(bool, PrintMethodFlushing, false, \ 2386 "print the nmethods being flushed") \ 2387 \ 2388 notproduct(bool, LogMultipleMutexLocking, false, \ 2389 "log locking and unlocking of mutexes (only if multiple locks " \ 2390 "are held)") \ 2391 \ 2392 develop(bool, UseRelocIndex, false, \ 2393 "use an index to speed random access to relocations") \ 2394 \ 2395 develop(bool, StressCodeBuffers, false, \ 2396 "Exercise code buffer expansion and other rare state changes") \ 2397 \ 2398 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2399 "Generate extra debugging info for non-safepoints in nmethods") \ 2400 \ 2401 diagnostic(bool, DebugInlinedCalls, true, \ 2402 "If false, restricts profiled locations to the root method only") \ 2403 \ 2404 product(bool, PrintVMOptions, trueInDebug, \ 2405 "Print flags that appeared on the command line") \ 2406 \ 2407 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2408 "Ignore unrecognized VM options") \ 2409 \ 2410 product(bool, PrintCommandLineFlags, false, \ 2411 "Print flags specified on command line or set by ergonomics") \ 2412 \ 2413 product(bool, PrintFlagsInitial, false, \ 2414 "Print all VM flags before argument processing and exit VM") \ 2415 \ 2416 product(bool, PrintFlagsFinal, false, \ 2417 "Print all VM flags after argument and ergonomic processing") \ 2418 \ 2419 notproduct(bool, PrintFlagsWithComments, false, \ 2420 "Print all VM flags with default values and descriptions and exit")\ 2421 \ 2422 diagnostic(bool, SerializeVMOutput, true, \ 2423 "Use a mutex to serialize output to tty and hotspot.log") \ 2424 \ 2425 diagnostic(bool, DisplayVMOutput, true, \ 2426 "Display all VM output on the tty, independently of LogVMOutput") \ 2427 \ 2428 diagnostic(bool, LogVMOutput, trueInDebug, \ 2429 "Save VM output to hotspot.log, or to LogFile") \ 2430 \ 2431 diagnostic(ccstr, LogFile, NULL, \ 2432 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2433 \ 2434 product(ccstr, ErrorFile, NULL, \ 2435 "If an error occurs, save the error data to this file " \ 2436 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2437 \ 2438 product(bool, DisplayVMOutputToStderr, false, \ 2439 "If DisplayVMOutput is true, display all VM output to stderr") \ 2440 \ 2441 product(bool, DisplayVMOutputToStdout, false, \ 2442 "If DisplayVMOutput is true, display all VM output to stdout") \ 2443 \ 2444 product(bool, UseHeavyMonitors, false, \ 2445 "use heavyweight instead of lightweight Java monitors") \ 2446 \ 2447 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2448 "print histogram of the symbol table") \ 2449 \ 2450 notproduct(bool, ExitVMOnVerifyError, false, \ 2451 "standard exit from VM if bytecode verify error " \ 2452 "(only in debug mode)") \ 2453 \ 2454 notproduct(ccstr, AbortVMOnException, NULL, \ 2455 "Call fatal if this exception is thrown. Example: " \ 2456 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2457 \ 2458 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2459 "Call fatal if the exception pointed by AbortVMOnException " \ 2460 "has this message.") \ 2461 \ 2462 develop(bool, DebugVtables, false, \ 2463 "add debugging code to vtable dispatch") \ 2464 \ 2465 develop(bool, PrintVtables, false, \ 2466 "print vtables when printing klass") \ 2467 \ 2468 notproduct(bool, PrintVtableStats, false, \ 2469 "print vtables stats at end of run") \ 2470 \ 2471 develop(bool, TraceCreateZombies, false, \ 2472 "trace creation of zombie nmethods") \ 2473 \ 2474 notproduct(bool, IgnoreLockingAssertions, false, \ 2475 "disable locking assertions (for speed)") \ 2476 \ 2477 notproduct(bool, VerifyLoopOptimizations, false, \ 2478 "verify major loop optimizations") \ 2479 \ 2480 product(bool, RangeCheckElimination, true, \ 2481 "Split loop iterations to eliminate range checks") \ 2482 \ 2483 develop_pd(bool, UncommonNullCast, \ 2484 "track occurrences of null in casts; adjust compiler tactics") \ 2485 \ 2486 develop(bool, TypeProfileCasts, true, \ 2487 "treat casts like calls for purposes of type profiling") \ 2488 \ 2489 develop(bool, MonomorphicArrayCheck, true, \ 2490 "Uncommon-trap array store checks that require full type check") \ 2491 \ 2492 diagnostic(bool, ProfileDynamicTypes, true, \ 2493 "do extra type profiling and use it more aggressively") \ 2494 \ 2495 develop(bool, DelayCompilationDuringStartup, true, \ 2496 "Delay invoking the compiler until main application class is " \ 2497 "loaded") \ 2498 \ 2499 develop(bool, CompileTheWorld, false, \ 2500 "Compile all methods in all classes in bootstrap class path " \ 2501 "(stress test)") \ 2502 \ 2503 develop(bool, CompileTheWorldPreloadClasses, true, \ 2504 "Preload all classes used by a class before start loading") \ 2505 \ 2506 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2507 "Compile all methods although class initializer failed") \ 2508 \ 2509 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2510 "Force a safepoint every n compiles so sweeper can keep up") \ 2511 \ 2512 develop(bool, TraceIterativeGVN, false, \ 2513 "Print progress during Iterative Global Value Numbering") \ 2514 \ 2515 develop(bool, FillDelaySlots, true, \ 2516 "Fill delay slots (on SPARC only)") \ 2517 \ 2518 develop(bool, VerifyIterativeGVN, false, \ 2519 "Verify Def-Use modifications during sparse Iterative Global " \ 2520 "Value Numbering") \ 2521 \ 2522 notproduct(bool, TracePhaseCCP, false, \ 2523 "Print progress during Conditional Constant Propagation") \ 2524 \ 2525 develop(bool, TimeLivenessAnalysis, false, \ 2526 "Time computation of bytecode liveness analysis") \ 2527 \ 2528 develop(bool, TraceLivenessGen, false, \ 2529 "Trace the generation of liveness analysis information") \ 2530 \ 2531 notproduct(bool, TraceLivenessQuery, false, \ 2532 "Trace queries of liveness analysis information") \ 2533 \ 2534 notproduct(bool, CollectIndexSetStatistics, false, \ 2535 "Collect information about IndexSets") \ 2536 \ 2537 develop(bool, PrintDominators, false, \ 2538 "Print out dominator trees for GVN") \ 2539 \ 2540 develop(bool, UseLoopSafepoints, true, \ 2541 "Generate Safepoint nodes in every loop") \ 2542 \ 2543 notproduct(bool, TraceCISCSpill, false, \ 2544 "Trace allocators use of cisc spillable instructions") \ 2545 \ 2546 notproduct(bool, TraceSpilling, false, \ 2547 "Trace spilling") \ 2548 \ 2549 product(bool, SplitIfBlocks, true, \ 2550 "Clone compares and control flow through merge points to fold " \ 2551 "some branches") \ 2552 \ 2553 develop(intx, FastAllocateSizeLimit, 128*K, \ 2554 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2555 "Inline allocations larger than this in doublewords must go slow")\ 2556 \ 2557 product(bool, AggressiveOpts, false, \ 2558 "Enable aggressive optimizations - see arguments.cpp") \ 2559 \ 2560 product(bool, UseStringCache, false, \ 2561 "Enable String cache capabilities on String.java") \ 2562 \ 2563 /* statistics */ \ 2564 develop(bool, CountCompiledCalls, false, \ 2565 "counts method invocations") \ 2566 \ 2567 notproduct(bool, CountRuntimeCalls, false, \ 2568 "counts VM runtime calls") \ 2569 \ 2570 develop(bool, CountJNICalls, false, \ 2571 "counts jni method invocations") \ 2572 \ 2573 notproduct(bool, CountJVMCalls, false, \ 2574 "counts jvm method invocations") \ 2575 \ 2576 notproduct(bool, CountRemovableExceptions, false, \ 2577 "count exceptions that could be replaced by branches due to " \ 2578 "inlining") \ 2579 \ 2580 notproduct(bool, ICMissHistogram, false, \ 2581 "produce histogram of IC misses") \ 2582 \ 2583 notproduct(bool, PrintClassStatistics, false, \ 2584 "prints class statistics at end of run") \ 2585 \ 2586 notproduct(bool, PrintMethodStatistics, false, \ 2587 "prints method statistics at end of run") \ 2588 \ 2589 /* interpreter */ \ 2590 develop(bool, ClearInterpreterLocals, false, \ 2591 "Always clear local variables of interpreter activations upon " \ 2592 "entry") \ 2593 \ 2594 product_pd(bool, RewriteBytecodes, \ 2595 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2596 \ 2597 product_pd(bool, RewriteFrequentPairs, \ 2598 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2599 \ 2600 diagnostic(bool, PrintInterpreter, false, \ 2601 "Prints the generated interpreter code") \ 2602 \ 2603 product(bool, UseInterpreter, true, \ 2604 "Use interpreter for non-compiled methods") \ 2605 \ 2606 develop(bool, UseFastSignatureHandlers, true, \ 2607 "Use fast signature handlers for native calls") \ 2608 \ 2609 develop(bool, UseV8InstrsOnly, false, \ 2610 "Use SPARC-V8 Compliant instruction subset") \ 2611 \ 2612 product(bool, UseNiagaraInstrs, false, \ 2613 "Use Niagara-efficient instruction subset") \ 2614 \ 2615 develop(bool, UseCASForSwap, false, \ 2616 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2617 \ 2618 product(bool, UseLoopCounter, true, \ 2619 "Increment invocation counter on backward branch") \ 2620 \ 2621 product(bool, UseFastEmptyMethods, true, \ 2622 "Use fast method entry code for empty methods") \ 2623 \ 2624 product(bool, UseFastAccessorMethods, true, \ 2625 "Use fast method entry code for accessor methods") \ 2626 \ 2627 product_pd(bool, UseOnStackReplacement, \ 2628 "Use on stack replacement, calls runtime if invoc. counter " \ 2629 "overflows in loop") \ 2630 \ 2631 notproduct(bool, TraceOnStackReplacement, false, \ 2632 "Trace on stack replacement") \ 2633 \ 2634 develop(bool, PoisonOSREntry, true, \ 2635 "Detect abnormal calls to OSR code") \ 2636 \ 2637 product_pd(bool, PreferInterpreterNativeStubs, \ 2638 "Use always interpreter stubs for native methods invoked via " \ 2639 "interpreter") \ 2640 \ 2641 develop(bool, CountBytecodes, false, \ 2642 "Count number of bytecodes executed") \ 2643 \ 2644 develop(bool, PrintBytecodeHistogram, false, \ 2645 "Print histogram of the executed bytecodes") \ 2646 \ 2647 develop(bool, PrintBytecodePairHistogram, false, \ 2648 "Print histogram of the executed bytecode pairs") \ 2649 \ 2650 diagnostic(bool, PrintSignatureHandlers, false, \ 2651 "Print code generated for native method signature handlers") \ 2652 \ 2653 develop(bool, VerifyOops, false, \ 2654 "Do plausibility checks for oops") \ 2655 \ 2656 develop(bool, CheckUnhandledOops, false, \ 2657 "Check for unhandled oops in VM code") \ 2658 \ 2659 develop(bool, VerifyJNIFields, trueInDebug, \ 2660 "Verify jfieldIDs for instance fields") \ 2661 \ 2662 notproduct(bool, VerifyJNIEnvThread, false, \ 2663 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2664 "from JNI") \ 2665 \ 2666 develop(bool, VerifyFPU, false, \ 2667 "Verify FPU state (check for NaN's, etc.)") \ 2668 \ 2669 develop(bool, VerifyThread, false, \ 2670 "Watch the thread register for corruption (SPARC only)") \ 2671 \ 2672 develop(bool, VerifyActivationFrameSize, false, \ 2673 "Verify that activation frame didn't become smaller than its " \ 2674 "minimal size") \ 2675 \ 2676 develop(bool, TraceFrequencyInlining, false, \ 2677 "Trace frequency based inlining") \ 2678 \ 2679 notproduct(bool, TraceTypeProfile, false, \ 2680 "Trace type profile") \ 2681 \ 2682 develop_pd(bool, InlineIntrinsics, \ 2683 "Inline intrinsics that can be statically resolved") \ 2684 \ 2685 product_pd(bool, ProfileInterpreter, \ 2686 "Profile at the bytecode level during interpretation") \ 2687 \ 2688 develop_pd(bool, ProfileTraps, \ 2689 "Profile deoptimization traps at the bytecode level") \ 2690 \ 2691 product(intx, ProfileMaturityPercentage, 20, \ 2692 "number of method invocations/branches (expressed as % of " \ 2693 "CompileThreshold) before using the method's profile") \ 2694 \ 2695 develop(bool, PrintMethodData, false, \ 2696 "Print the results of +ProfileInterpreter at end of run") \ 2697 \ 2698 develop(bool, VerifyDataPointer, trueInDebug, \ 2699 "Verify the method data pointer during interpreter profiling") \ 2700 \ 2701 develop(bool, VerifyCompiledCode, false, \ 2702 "Include miscellaneous runtime verifications in nmethod code; " \ 2703 "default off because it disturbs nmethod size heuristics") \ 2704 \ 2705 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2706 "Manually make GC thread crash then dump java stack trace; " \ 2707 "Test only") \ 2708 \ 2709 /* compilation */ \ 2710 product(bool, UseCompiler, true, \ 2711 "use compilation") \ 2712 \ 2713 develop(bool, TraceCompilationPolicy, false, \ 2714 "Trace compilation policy") \ 2715 \ 2716 develop(bool, TimeCompilationPolicy, false, \ 2717 "Time the compilation policy") \ 2718 \ 2719 product(bool, UseCounterDecay, true, \ 2720 "adjust recompilation counters") \ 2721 \ 2722 develop(intx, CounterHalfLifeTime, 30, \ 2723 "half-life time of invocation counters (in secs)") \ 2724 \ 2725 develop(intx, CounterDecayMinIntervalLength, 500, \ 2726 "Min. ms. between invocation of CounterDecay") \ 2727 \ 2728 product(bool, AlwaysCompileLoopMethods, false, \ 2729 "when using recompilation, never interpret methods " \ 2730 "containing loops") \ 2731 \ 2732 product(bool, DontCompileHugeMethods, true, \ 2733 "don't compile methods > HugeMethodLimit") \ 2734 \ 2735 /* Bytecode escape analysis estimation. */ \ 2736 product(bool, EstimateArgEscape, true, \ 2737 "Analyze bytecodes to estimate escape state of arguments") \ 2738 \ 2739 product(intx, BCEATraceLevel, 0, \ 2740 "How much tracing to do of bytecode escape analysis estimates") \ 2741 \ 2742 product(intx, MaxBCEAEstimateLevel, 5, \ 2743 "Maximum number of nested calls that are analyzed by BC EA.") \ 2744 \ 2745 product(intx, MaxBCEAEstimateSize, 150, \ 2746 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2747 \ 2748 product(intx, AllocatePrefetchStyle, 1, \ 2749 "0 = no prefetch, " \ 2750 "1 = prefetch instructions for each allocation, " \ 2751 "2 = use TLAB watermark to gate allocation prefetch, " \ 2752 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2753 \ 2754 product(intx, AllocatePrefetchDistance, -1, \ 2755 "Distance to prefetch ahead of allocation pointer") \ 2756 \ 2757 product(intx, AllocatePrefetchLines, 1, \ 2758 "Number of lines to prefetch ahead of allocation pointer") \ 2759 \ 2760 product(intx, AllocatePrefetchStepSize, 16, \ 2761 "Step size in bytes of sequential prefetch instructions") \ 2762 \ 2763 product(intx, AllocatePrefetchInstr, 0, \ 2764 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2765 \ 2766 product(intx, ReadPrefetchInstr, 0, \ 2767 "Prefetch instruction to prefetch ahead") \ 2768 \ 2769 /* deoptimization */ \ 2770 develop(bool, TraceDeoptimization, false, \ 2771 "Trace deoptimization") \ 2772 \ 2773 develop(bool, DebugDeoptimization, false, \ 2774 "Tracing various information while debugging deoptimization") \ 2775 \ 2776 product(intx, SelfDestructTimer, 0, \ 2777 "Will cause VM to terminate after a given time (in minutes) " \ 2778 "(0 means off)") \ 2779 \ 2780 product(intx, MaxJavaStackTraceDepth, 1024, \ 2781 "Max. no. of lines in the stack trace for Java exceptions " \ 2782 "(0 means all)") \ 2783 \ 2784 develop(intx, GuaranteedSafepointInterval, 1000, \ 2785 "Guarantee a safepoint (at least) every so many milliseconds " \ 2786 "(0 means none)") \ 2787 \ 2788 product(intx, SafepointTimeoutDelay, 10000, \ 2789 "Delay in milliseconds for option SafepointTimeout") \ 2790 \ 2791 product(intx, NmethodSweepFraction, 4, \ 2792 "Number of invocations of sweeper to cover all nmethods") \ 2793 \ 2794 product(intx, NmethodSweepCheckInterval, 5, \ 2795 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2796 \ 2797 notproduct(intx, MemProfilingInterval, 500, \ 2798 "Time between each invocation of the MemProfiler") \ 2799 \ 2800 develop(intx, MallocCatchPtr, -1, \ 2801 "Hit breakpoint when mallocing/freeing this pointer") \ 2802 \ 2803 notproduct(intx, AssertRepeat, 1, \ 2804 "number of times to evaluate expression in assert " \ 2805 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2806 \ 2807 notproduct(ccstrlist, SuppressErrorAt, "", \ 2808 "List of assertions (file:line) to muzzle") \ 2809 \ 2810 notproduct(uintx, HandleAllocationLimit, 1024, \ 2811 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2812 "is used") \ 2813 \ 2814 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2815 "Threshold for total handle allocation when " \ 2816 "+TraceHandleAllocation is used") \ 2817 \ 2818 develop(intx, StackPrintLimit, 100, \ 2819 "number of stack frames to print in VM-level stack dump") \ 2820 \ 2821 notproduct(intx, MaxElementPrintSize, 256, \ 2822 "maximum number of elements to print") \ 2823 \ 2824 notproduct(intx, MaxSubklassPrintSize, 4, \ 2825 "maximum number of subklasses to print when printing klass") \ 2826 \ 2827 product(intx, MaxInlineLevel, 9, \ 2828 "maximum number of nested calls that are inlined") \ 2829 \ 2830 product(intx, MaxRecursiveInlineLevel, 1, \ 2831 "maximum number of nested recursive calls that are inlined") \ 2832 \ 2833 product_pd(intx, InlineSmallCode, \ 2834 "Only inline already compiled methods if their code size is " \ 2835 "less than this") \ 2836 \ 2837 product(intx, MaxInlineSize, 35, \ 2838 "maximum bytecode size of a method to be inlined") \ 2839 \ 2840 product_pd(intx, FreqInlineSize, \ 2841 "maximum bytecode size of a frequent method to be inlined") \ 2842 \ 2843 product(intx, MaxTrivialSize, 6, \ 2844 "maximum bytecode size of a trivial method to be inlined") \ 2845 \ 2846 product(intx, MinInliningThreshold, 250, \ 2847 "min. invocation count a method needs to have to be inlined") \ 2848 \ 2849 develop(intx, AlignEntryCode, 4, \ 2850 "aligns entry code to specified value (in bytes)") \ 2851 \ 2852 develop(intx, MethodHistogramCutoff, 100, \ 2853 "cutoff value for method invoc. histogram (+CountCalls)") \ 2854 \ 2855 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2856 "# of interpreted methods to show in profile") \ 2857 \ 2858 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2859 "# of compiled methods to show in profile") \ 2860 \ 2861 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2862 "# of stub methods to show in profile") \ 2863 \ 2864 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2865 "# of runtime stub nodes to show in profile") \ 2866 \ 2867 product(intx, ProfileIntervalsTicks, 100, \ 2868 "# of ticks between printing of interval profile " \ 2869 "(+ProfileIntervals)") \ 2870 \ 2871 notproduct(intx, ScavengeALotInterval, 1, \ 2872 "Interval between which scavenge will occur with +ScavengeALot") \ 2873 \ 2874 notproduct(intx, FullGCALotInterval, 1, \ 2875 "Interval between which full gc will occur with +FullGCALot") \ 2876 \ 2877 notproduct(intx, FullGCALotStart, 0, \ 2878 "For which invocation to start FullGCAlot") \ 2879 \ 2880 notproduct(intx, FullGCALotDummies, 32*K, \ 2881 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2882 "to move") \ 2883 \ 2884 develop(intx, DontYieldALotInterval, 10, \ 2885 "Interval between which yields will be dropped (milliseconds)") \ 2886 \ 2887 develop(intx, MinSleepInterval, 1, \ 2888 "Minimum sleep() interval (milliseconds) when " \ 2889 "ConvertSleepToYield is off (used for SOLARIS)") \ 2890 \ 2891 product(intx, EventLogLength, 2000, \ 2892 "maximum nof events in event log") \ 2893 \ 2894 develop(intx, ProfilerPCTickThreshold, 15, \ 2895 "Number of ticks in a PC buckets to be a hotspot") \ 2896 \ 2897 notproduct(intx, DeoptimizeALotInterval, 5, \ 2898 "Number of exits until DeoptimizeALot kicks in") \ 2899 \ 2900 notproduct(intx, ZombieALotInterval, 5, \ 2901 "Number of exits until ZombieALot kicks in") \ 2902 \ 2903 develop(bool, StressNonEntrant, false, \ 2904 "Mark nmethods non-entrant at registration") \ 2905 \ 2906 diagnostic(intx, MallocVerifyInterval, 0, \ 2907 "if non-zero, verify C heap after every N calls to " \ 2908 "malloc/realloc/free") \ 2909 \ 2910 diagnostic(intx, MallocVerifyStart, 0, \ 2911 "if non-zero, start verifying C heap after Nth call to " \ 2912 "malloc/realloc/free") \ 2913 \ 2914 product(intx, TypeProfileWidth, 2, \ 2915 "number of receiver types to record in call/cast profile") \ 2916 \ 2917 develop(intx, BciProfileWidth, 2, \ 2918 "number of return bci's to record in ret profile") \ 2919 \ 2920 product(intx, PerMethodRecompilationCutoff, 400, \ 2921 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2922 \ 2923 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2924 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2925 \ 2926 product(intx, PerMethodTrapLimit, 100, \ 2927 "Limit on traps (of one kind) in a method (includes inlines)") \ 2928 \ 2929 product(intx, PerBytecodeTrapLimit, 4, \ 2930 "Limit on traps (of one kind) at a particular BCI") \ 2931 \ 2932 develop(intx, FreqCountInvocations, 1, \ 2933 "Scaling factor for branch frequencies (deprecated)") \ 2934 \ 2935 develop(intx, InlineFrequencyRatio, 20, \ 2936 "Ratio of call site execution to caller method invocation") \ 2937 \ 2938 develop_pd(intx, InlineFrequencyCount, \ 2939 "Count of call site execution necessary to trigger frequent " \ 2940 "inlining") \ 2941 \ 2942 develop(intx, InlineThrowCount, 50, \ 2943 "Force inlining of interpreted methods that throw this often") \ 2944 \ 2945 develop(intx, InlineThrowMaxSize, 200, \ 2946 "Force inlining of throwing methods smaller than this") \ 2947 \ 2948 product(intx, AliasLevel, 3, \ 2949 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2950 "2 for class split, 3 for unique instances") \ 2951 \ 2952 develop(bool, VerifyAliases, false, \ 2953 "perform extra checks on the results of alias analysis") \ 2954 \ 2955 develop(intx, ProfilerNodeSize, 1024, \ 2956 "Size in K to allocate for the Profile Nodes of each thread") \ 2957 \ 2958 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2959 "Number of times to spin wait on a v8 atomic operation lock") \ 2960 \ 2961 product(intx, ReadSpinIterations, 100, \ 2962 "Number of read attempts before a yield (spin inner loop)") \ 2963 \ 2964 product_pd(intx, PreInflateSpin, \ 2965 "Number of times to spin wait before inflation") \ 2966 \ 2967 product(intx, PreBlockSpin, 10, \ 2968 "Number of times to spin in an inflated lock before going to " \ 2969 "an OS lock") \ 2970 \ 2971 /* gc parameters */ \ 2972 product(uintx, InitialHeapSize, 0, \ 2973 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2974 \ 2975 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2976 "Maximum heap size (in bytes)") \ 2977 \ 2978 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2979 "Initial tenured generation size (in bytes)") \ 2980 \ 2981 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2982 "Initial new generation size (in bytes)") \ 2983 \ 2984 product(uintx, MaxNewSize, max_uintx, \ 2985 "Maximum new generation size (in bytes), max_uintx means set " \ 2986 "ergonomically") \ 2987 \ 2988 product(uintx, PretenureSizeThreshold, 0, \ 2989 "Maximum size in bytes of objects allocated in DefNew " \ 2990 "generation; zero means no maximum") \ 2991 \ 2992 product(uintx, TLABSize, 0, \ 2993 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2994 \ 2995 product(uintx, MinTLABSize, 2*K, \ 2996 "Minimum allowed TLAB size (in bytes)") \ 2997 \ 2998 product(uintx, TLABAllocationWeight, 35, \ 2999 "Allocation averaging weight") \ 3000 \ 3001 product(uintx, TLABWasteTargetPercent, 1, \ 3002 "Percentage of Eden that can be wasted") \ 3003 \ 3004 product(uintx, TLABRefillWasteFraction, 64, \ 3005 "Max TLAB waste at a refill (internal fragmentation)") \ 3006 \ 3007 product(uintx, TLABWasteIncrement, 4, \ 3008 "Increment allowed waste at slow allocation") \ 3009 \ 3010 product(intx, SurvivorRatio, 8, \ 3011 "Ratio of eden/survivor space size") \ 3012 \ 3013 product(intx, NewRatio, 2, \ 3014 "Ratio of new/old generation sizes") \ 3015 \ 3016 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 3017 "Max percent of eden objects that will be live at scavenge") \ 3018 \ 3019 product_pd(uintx, NewSizeThreadIncrease, \ 3020 "Additional size added to desired new generation size per " \ 3021 "non-daemon thread (in bytes)") \ 3022 \ 3023 product_pd(uintx, PermSize, \ 3024 "Initial size of permanent generation (in bytes)") \ 3025 \ 3026 product_pd(uintx, MaxPermSize, \ 3027 "Maximum size of permanent generation (in bytes)") \ 3028 \ 3029 product(uintx, MinHeapFreeRatio, 40, \ 3030 "Min percentage of heap free after GC to avoid expansion") \ 3031 \ 3032 product(uintx, MaxHeapFreeRatio, 70, \ 3033 "Max percentage of heap free after GC to avoid shrinking") \ 3034 \ 3035 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3036 "Number of milliseconds per MB of free space in the heap") \ 3037 \ 3038 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3039 "Min change in heap space due to GC (in bytes)") \ 3040 \ 3041 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3042 "Min expansion of permanent heap (in bytes)") \ 3043 \ 3044 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3045 "Max expansion of permanent heap without full GC (in bytes)") \ 3046 \ 3047 product(intx, QueuedAllocationWarningCount, 0, \ 3048 "Number of times an allocation that queues behind a GC " \ 3049 "will retry before printing a warning") \ 3050 \ 3051 diagnostic(uintx, VerifyGCStartAt, 0, \ 3052 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3053 \ 3054 diagnostic(intx, VerifyGCLevel, 0, \ 3055 "Generation level at which to start +VerifyBefore/AfterGC") \ 3056 \ 3057 develop(uintx, ExitAfterGCNum, 0, \ 3058 "If non-zero, exit after this GC.") \ 3059 \ 3060 product(intx, MaxTenuringThreshold, 15, \ 3061 "Maximum value for tenuring threshold") \ 3062 \ 3063 product(intx, InitialTenuringThreshold, 7, \ 3064 "Initial value for tenuring threshold") \ 3065 \ 3066 product(intx, TargetSurvivorRatio, 50, \ 3067 "Desired percentage of survivor space used after scavenge") \ 3068 \ 3069 product(uintx, MarkSweepDeadRatio, 5, \ 3070 "Percentage (0-100) of the old gen allowed as dead wood." \ 3071 "Serial mark sweep treats this as both the min and max value." \ 3072 "CMS uses this value only if it falls back to mark sweep." \ 3073 "Par compact uses a variable scale based on the density of the" \ 3074 "generation and treats this as the max value when the heap is" \ 3075 "either completely full or completely empty. Par compact also" \ 3076 "has a smaller default value; see arguments.cpp.") \ 3077 \ 3078 product(uintx, PermMarkSweepDeadRatio, 20, \ 3079 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3080 "See MarkSweepDeadRatio for collector-specific comments.") \ 3081 \ 3082 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3083 "How often should we fully compact the heap (ignoring the dead " \ 3084 "space parameters)") \ 3085 \ 3086 product(intx, PrintCMSStatistics, 0, \ 3087 "Statistics for CMS") \ 3088 \ 3089 product(bool, PrintCMSInitiationStatistics, false, \ 3090 "Statistics for initiating a CMS collection") \ 3091 \ 3092 product(intx, PrintFLSStatistics, 0, \ 3093 "Statistics for CMS' FreeListSpace") \ 3094 \ 3095 product(intx, PrintFLSCensus, 0, \ 3096 "Census for CMS' FreeListSpace") \ 3097 \ 3098 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3099 "Delay in ms between expansion and allocation") \ 3100 \ 3101 product(intx, DeferThrSuspendLoopCount, 4000, \ 3102 "(Unstable) Number of times to iterate in safepoint loop " \ 3103 " before blocking VM threads ") \ 3104 \ 3105 product(intx, DeferPollingPageLoopCount, -1, \ 3106 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3107 "before changing safepoint polling page to RO ") \ 3108 \ 3109 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3110 \ 3111 product(bool, PSChunkLargeArrays, true, \ 3112 "true: process large arrays in chunks") \ 3113 \ 3114 product(uintx, GCDrainStackTargetSize, 64, \ 3115 "how many entries we'll try to leave on the stack during " \ 3116 "parallel GC") \ 3117 \ 3118 /* stack parameters */ \ 3119 product_pd(intx, StackYellowPages, \ 3120 "Number of yellow zone (recoverable overflows) pages") \ 3121 \ 3122 product_pd(intx, StackRedPages, \ 3123 "Number of red zone (unrecoverable overflows) pages") \ 3124 \ 3125 product_pd(intx, StackShadowPages, \ 3126 "Number of shadow zone (for overflow checking) pages" \ 3127 " this should exceed the depth of the VM and native call stack") \ 3128 \ 3129 product_pd(intx, ThreadStackSize, \ 3130 "Thread Stack Size (in Kbytes)") \ 3131 \ 3132 product_pd(intx, VMThreadStackSize, \ 3133 "Non-Java Thread Stack Size (in Kbytes)") \ 3134 \ 3135 product_pd(intx, CompilerThreadStackSize, \ 3136 "Compiler Thread Stack Size (in Kbytes)") \ 3137 \ 3138 develop_pd(uintx, JVMInvokeMethodSlack, \ 3139 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3140 \ 3141 product(uintx, ThreadSafetyMargin, 50*M, \ 3142 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3143 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3144 "disable this feature") \ 3145 \ 3146 /* code cache parameters */ \ 3147 develop(uintx, CodeCacheSegmentSize, 64, \ 3148 "Code cache segment size (in bytes) - smallest unit of " \ 3149 "allocation") \ 3150 \ 3151 develop_pd(intx, CodeEntryAlignment, \ 3152 "Code entry alignment for generated code (in bytes)") \ 3153 \ 3154 product_pd(intx, OptoLoopAlignment, \ 3155 "Align inner loops to zero relative to this modulus") \ 3156 \ 3157 product_pd(uintx, InitialCodeCacheSize, \ 3158 "Initial code cache size (in bytes)") \ 3159 \ 3160 product_pd(uintx, ReservedCodeCacheSize, \ 3161 "Reserved code cache size (in bytes) - maximum code cache size") \ 3162 \ 3163 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3164 "When less than X space left, we stop compiling.") \ 3165 \ 3166 product_pd(uintx, CodeCacheExpansionSize, \ 3167 "Code cache expansion size (in bytes)") \ 3168 \ 3169 develop_pd(uintx, CodeCacheMinBlockLength, \ 3170 "Minimum number of segments in a code cache block.") \ 3171 \ 3172 notproduct(bool, ExitOnFullCodeCache, false, \ 3173 "Exit the VM if we fill the code cache.") \ 3174 \ 3175 product(bool, UseCodeCacheFlushing, false, \ 3176 "Attempt to clean the code cache before shutting off compiler") \ 3177 \ 3178 product(intx, MinCodeCacheFlushingInterval, 30, \ 3179 "Min number of seconds between code cache cleaning sessions") \ 3180 \ 3181 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3182 "When less than X space left, start code cache cleaning") \ 3183 \ 3184 /* interpreter debugging */ \ 3185 develop(intx, BinarySwitchThreshold, 5, \ 3186 "Minimal number of lookupswitch entries for rewriting to binary " \ 3187 "switch") \ 3188 \ 3189 develop(intx, StopInterpreterAt, 0, \ 3190 "Stops interpreter execution at specified bytecode number") \ 3191 \ 3192 develop(intx, TraceBytecodesAt, 0, \ 3193 "Traces bytecodes starting with specified bytecode number") \ 3194 \ 3195 /* compiler interface */ \ 3196 develop(intx, CIStart, 0, \ 3197 "the id of the first compilation to permit") \ 3198 \ 3199 develop(intx, CIStop, -1, \ 3200 "the id of the last compilation to permit") \ 3201 \ 3202 develop(intx, CIStartOSR, 0, \ 3203 "the id of the first osr compilation to permit " \ 3204 "(CICountOSR must be on)") \ 3205 \ 3206 develop(intx, CIStopOSR, -1, \ 3207 "the id of the last osr compilation to permit " \ 3208 "(CICountOSR must be on)") \ 3209 \ 3210 develop(intx, CIBreakAtOSR, -1, \ 3211 "id of osr compilation to break at") \ 3212 \ 3213 develop(intx, CIBreakAt, -1, \ 3214 "id of compilation to break at") \ 3215 \ 3216 product(ccstrlist, CompileOnly, "", \ 3217 "List of methods (pkg/class.name) to restrict compilation to") \ 3218 \ 3219 product(ccstr, CompileCommandFile, NULL, \ 3220 "Read compiler commands from this file [.hotspot_compiler]") \ 3221 \ 3222 product(ccstrlist, CompileCommand, "", \ 3223 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3224 \ 3225 product(bool, CICompilerCountPerCPU, false, \ 3226 "1 compiler thread for log(N CPUs)") \ 3227 \ 3228 develop(intx, CIFireOOMAt, -1, \ 3229 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3230 "(non-negative value throws OOM after this many CI accesses " \ 3231 "in each compile)") \ 3232 \ 3233 develop(intx, CIFireOOMAtDelay, -1, \ 3234 "Wait for this many CI accesses to occur in all compiles before " \ 3235 "beginning to throw OutOfMemoryErrors in each compile") \ 3236 \ 3237 notproduct(bool, CIObjectFactoryVerify, false, \ 3238 "enable potentially expensive verification in ciObjectFactory") \ 3239 \ 3240 /* Priorities */ \ 3241 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3242 \ 3243 product(intx, ThreadPriorityPolicy, 0, \ 3244 "0 : Normal. "\ 3245 " VM chooses priorities that are appropriate for normal "\ 3246 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3247 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3248 " map to lower native priority values. On Windows applications"\ 3249 " are allowed to use higher native priorities. However, with "\ 3250 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3251 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3252 " interfere with system threads. On Linux thread priorities "\ 3253 " are ignored because the OS does not support static priority "\ 3254 " in SCHED_OTHER scheduling class which is the only choice for"\ 3255 " non-root, non-realtime applications. "\ 3256 "1 : Aggressive. "\ 3257 " Java thread priorities map over to the entire range of "\ 3258 " native thread priorities. Higher Java thread priorities map "\ 3259 " to higher native thread priorities. This policy should be "\ 3260 " used with care, as sometimes it can cause performance "\ 3261 " degradation in the application and/or the entire system. On "\ 3262 " Linux this policy requires root privilege.") \ 3263 \ 3264 product(bool, ThreadPriorityVerbose, false, \ 3265 "print priority changes") \ 3266 \ 3267 product(intx, DefaultThreadPriority, -1, \ 3268 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3269 \ 3270 product(intx, CompilerThreadPriority, -1, \ 3271 "what priority should compiler threads run at (-1 means no change)") \ 3272 \ 3273 product(intx, VMThreadPriority, -1, \ 3274 "what priority should VM threads run at (-1 means no change)") \ 3275 \ 3276 product(bool, CompilerThreadHintNoPreempt, true, \ 3277 "(Solaris only) Give compiler threads an extra quanta") \ 3278 \ 3279 product(bool, VMThreadHintNoPreempt, false, \ 3280 "(Solaris only) Give VM thread an extra quanta") \ 3281 \ 3282 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3283 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3284 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3285 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3286 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3287 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3288 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3289 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3290 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3291 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3292 \ 3293 /* compiler debugging */ \ 3294 notproduct(intx, CompileTheWorldStartAt, 1, \ 3295 "First class to consider when using +CompileTheWorld") \ 3296 \ 3297 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3298 "Last class to consider when using +CompileTheWorld") \ 3299 \ 3300 develop(intx, NewCodeParameter, 0, \ 3301 "Testing Only: Create a dedicated integer parameter before " \ 3302 "putback") \ 3303 \ 3304 /* new oopmap storage allocation */ \ 3305 develop(intx, MinOopMapAllocation, 8, \ 3306 "Minimum number of OopMap entries in an OopMapSet") \ 3307 \ 3308 /* Background Compilation */ \ 3309 develop(intx, LongCompileThreshold, 50, \ 3310 "Used with +TraceLongCompiles") \ 3311 \ 3312 product(intx, StarvationMonitorInterval, 200, \ 3313 "Pause between each check in ms") \ 3314 \ 3315 /* recompilation */ \ 3316 product_pd(intx, CompileThreshold, \ 3317 "number of interpreted method invocations before (re-)compiling") \ 3318 \ 3319 product_pd(intx, BackEdgeThreshold, \ 3320 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3321 \ 3322 product(intx, Tier1BytecodeLimit, 10, \ 3323 "Must have at least this many bytecodes before tier1" \ 3324 "invocation counters are used") \ 3325 \ 3326 product_pd(intx, Tier2CompileThreshold, \ 3327 "threshold at which a tier 2 compilation is invoked") \ 3328 \ 3329 product_pd(intx, Tier2BackEdgeThreshold, \ 3330 "Back edge threshold at which a tier 2 compilation is invoked") \ 3331 \ 3332 product_pd(intx, Tier3CompileThreshold, \ 3333 "threshold at which a tier 3 compilation is invoked") \ 3334 \ 3335 product_pd(intx, Tier3BackEdgeThreshold, \ 3336 "Back edge threshold at which a tier 3 compilation is invoked") \ 3337 \ 3338 product_pd(intx, Tier4CompileThreshold, \ 3339 "threshold at which a tier 4 compilation is invoked") \ 3340 \ 3341 product_pd(intx, Tier4BackEdgeThreshold, \ 3342 "Back edge threshold at which a tier 4 compilation is invoked") \ 3343 \ 3344 product_pd(bool, TieredCompilation, \ 3345 "Enable two-tier compilation") \ 3346 \ 3347 product(bool, StressTieredRuntime, false, \ 3348 "Alternate client and server compiler on compile requests") \ 3349 \ 3350 product_pd(intx, OnStackReplacePercentage, \ 3351 "NON_TIERED number of method invocations/branches (expressed as %"\ 3352 "of CompileThreshold) before (re-)compiling OSR code") \ 3353 \ 3354 product(intx, InterpreterProfilePercentage, 33, \ 3355 "NON_TIERED number of method invocations/branches (expressed as %"\ 3356 "of CompileThreshold) before profiling in the interpreter") \ 3357 \ 3358 develop(intx, MaxRecompilationSearchLength, 10, \ 3359 "max. # frames to inspect searching for recompilee") \ 3360 \ 3361 develop(intx, MaxInterpretedSearchLength, 3, \ 3362 "max. # interp. frames to skip when searching for recompilee") \ 3363 \ 3364 develop(intx, DesiredMethodLimit, 8000, \ 3365 "desired max. method size (in bytecodes) after inlining") \ 3366 \ 3367 develop(intx, HugeMethodLimit, 8000, \ 3368 "don't compile methods larger than this if " \ 3369 "+DontCompileHugeMethods") \ 3370 \ 3371 /* New JDK 1.4 reflection implementation */ \ 3372 \ 3373 develop(bool, UseNewReflection, true, \ 3374 "Temporary flag for transition to reflection based on dynamic " \ 3375 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3376 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3377 "changes were needed") \ 3378 \ 3379 develop(bool, VerifyReflectionBytecodes, false, \ 3380 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3381 "in situations like that described in 4486457 or for " \ 3382 "constructors generated for serialization, so can not be enabled "\ 3383 "in product.") \ 3384 \ 3385 product(bool, ReflectionWrapResolutionErrors, true, \ 3386 "Temporary flag for transition to AbstractMethodError wrapped " \ 3387 "in InvocationTargetException. See 6531596") \ 3388 \ 3389 \ 3390 develop(intx, FastSuperclassLimit, 8, \ 3391 "Depth of hardwired instanceof accelerator array") \ 3392 \ 3393 /* Properties for Java libraries */ \ 3394 \ 3395 product(intx, MaxDirectMemorySize, -1, \ 3396 "Maximum total size of NIO direct-buffer allocations") \ 3397 \ 3398 /* temporary developer defined flags */ \ 3399 \ 3400 diagnostic(bool, UseNewCode, false, \ 3401 "Testing Only: Use the new version while testing") \ 3402 \ 3403 diagnostic(bool, UseNewCode2, false, \ 3404 "Testing Only: Use the new version while testing") \ 3405 \ 3406 diagnostic(bool, UseNewCode3, false, \ 3407 "Testing Only: Use the new version while testing") \ 3408 \ 3409 /* flags for performance data collection */ \ 3410 \ 3411 product(bool, UsePerfData, true, \ 3412 "Flag to disable jvmstat instrumentation for performance testing" \ 3413 "and problem isolation purposes.") \ 3414 \ 3415 product(bool, PerfDataSaveToFile, false, \ 3416 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3417 \ 3418 product(ccstr, PerfDataSaveFile, NULL, \ 3419 "Save PerfData memory to the specified absolute pathname," \ 3420 "%p in the file name if present will be replaced by pid") \ 3421 \ 3422 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3423 "Data sampling interval in milliseconds") \ 3424 \ 3425 develop(bool, PerfTraceDataCreation, false, \ 3426 "Trace creation of Performance Data Entries") \ 3427 \ 3428 develop(bool, PerfTraceMemOps, false, \ 3429 "Trace PerfMemory create/attach/detach calls") \ 3430 \ 3431 product(bool, PerfDisableSharedMem, false, \ 3432 "Store performance data in standard memory") \ 3433 \ 3434 product(intx, PerfDataMemorySize, 32*K, \ 3435 "Size of performance data memory region. Will be rounded " \ 3436 "up to a multiple of the native os page size.") \ 3437 \ 3438 product(intx, PerfMaxStringConstLength, 1024, \ 3439 "Maximum PerfStringConstant string length before truncation") \ 3440 \ 3441 product(bool, PerfAllowAtExitRegistration, false, \ 3442 "Allow registration of atexit() methods") \ 3443 \ 3444 product(bool, PerfBypassFileSystemCheck, false, \ 3445 "Bypass Win32 file system criteria checks (Windows Only)") \ 3446 \ 3447 product(intx, UnguardOnExecutionViolation, 0, \ 3448 "Unguard page and retry on no-execute fault (Win32 only)" \ 3449 "0=off, 1=conservative, 2=aggressive") \ 3450 \ 3451 /* Serviceability Support */ \ 3452 \ 3453 product(bool, ManagementServer, false, \ 3454 "Create JMX Management Server") \ 3455 \ 3456 product(bool, DisableAttachMechanism, false, \ 3457 "Disable mechanism that allows tools to attach to this VM") \ 3458 \ 3459 product(bool, StartAttachListener, false, \ 3460 "Always start Attach Listener at VM startup") \ 3461 \ 3462 manageable(bool, PrintConcurrentLocks, false, \ 3463 "Print java.util.concurrent locks in thread dump") \ 3464 \ 3465 /* Shared spaces */ \ 3466 \ 3467 product(bool, UseSharedSpaces, true, \ 3468 "Use shared spaces in the permanent generation") \ 3469 \ 3470 product(bool, RequireSharedSpaces, false, \ 3471 "Require shared spaces in the permanent generation") \ 3472 \ 3473 product(bool, ForceSharedSpaces, false, \ 3474 "Require shared spaces in the permanent generation") \ 3475 \ 3476 product(bool, DumpSharedSpaces, false, \ 3477 "Special mode: JVM reads a class list, loads classes, builds " \ 3478 "shared spaces, and dumps the shared spaces to a file to be " \ 3479 "used in future JVM runs.") \ 3480 \ 3481 product(bool, PrintSharedSpaces, false, \ 3482 "Print usage of shared spaces") \ 3483 \ 3484 product(uintx, SharedDummyBlockSize, 512*M, \ 3485 "Size of dummy block used to shift heap addresses (in bytes)") \ 3486 \ 3487 product(uintx, SharedReadWriteSize, 12*M, \ 3488 "Size of read-write space in permanent generation (in bytes)") \ 3489 \ 3490 product(uintx, SharedReadOnlySize, 10*M, \ 3491 "Size of read-only space in permanent generation (in bytes)") \ 3492 \ 3493 product(uintx, SharedMiscDataSize, 4*M, \ 3494 "Size of the shared data area adjacent to the heap (in bytes)") \ 3495 \ 3496 product(uintx, SharedMiscCodeSize, 4*M, \ 3497 "Size of the shared code area adjacent to the heap (in bytes)") \ 3498 \ 3499 diagnostic(bool, SharedOptimizeColdStart, true, \ 3500 "At dump time, order shared objects to achieve better " \ 3501 "cold startup time.") \ 3502 \ 3503 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3504 "Reordering policy for SharedOptimizeColdStart " \ 3505 "0=favor classload-time locality, 1=balanced, " \ 3506 "2=favor runtime locality") \ 3507 \ 3508 diagnostic(bool, SharedSkipVerify, false, \ 3509 "Skip assert() and verify() which page-in unwanted shared " \ 3510 "objects. ") \ 3511 \ 3512 product(bool, AnonymousClasses, false, \ 3513 "support sun.misc.Unsafe.defineAnonymousClass") \ 3514 \ 3515 experimental(bool, EnableMethodHandles, false, \ 3516 "support method handles (true by default under JSR 292)") \ 3517 \ 3518 diagnostic(intx, MethodHandlePushLimit, 3, \ 3519 "number of additional stack slots a method handle may push") \ 3520 \ 3521 develop(bool, TraceMethodHandles, false, \ 3522 "trace internal method handle operations") \ 3523 \ 3524 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3525 "perform extra checks when constructing method handles") \ 3526 \ 3527 diagnostic(bool, OptimizeMethodHandles, true, \ 3528 "when constructing method handles, try to improve them") \ 3529 \ 3530 experimental(bool, TrustFinalNonStaticFields, false, \ 3531 "trust final non-static declarations for constant folding") \ 3532 \ 3533 experimental(bool, EnableInvokeDynamic, false, \ 3534 "recognize the invokedynamic instruction") \ 3535 \ 3536 experimental(bool, AllowTransitionalJSR292, true, \ 3537 "recognize pre-PFD formats of invokedynamic") \ 3538 \ 3539 develop(bool, TraceInvokeDynamic, false, \ 3540 "trace internal invoke dynamic operations") \ 3541 \ 3542 diagnostic(bool, PauseAtStartup, false, \ 3543 "Causes the VM to pause at startup time and wait for the pause " \ 3544 "file to be removed (default: ./vm.paused.<pid>)") \ 3545 \ 3546 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3547 "The file to create and for whose removal to await when pausing " \ 3548 "at startup. (default: ./vm.paused.<pid>)") \ 3549 \ 3550 product(bool, ExtendedDTraceProbes, false, \ 3551 "Enable performance-impacting dtrace probes") \ 3552 \ 3553 product(bool, DTraceMethodProbes, false, \ 3554 "Enable dtrace probes for method-entry and method-exit") \ 3555 \ 3556 product(bool, DTraceAllocProbes, false, \ 3557 "Enable dtrace probes for object allocation") \ 3558 \ 3559 product(bool, DTraceMonitorProbes, false, \ 3560 "Enable dtrace probes for monitor events") \ 3561 \ 3562 product(bool, RelaxAccessControlCheck, false, \ 3563 "Relax the access control checks in the verifier") \ 3564 \ 3565 diagnostic(bool, PrintDTraceDOF, false, \ 3566 "Print the DTrace DOF passed to the system for JSDT probes") \ 3567 \ 3568 product(bool, UseVMInterruptibleIO, false, \ 3569 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3570 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3571 " of this flag is true for JDK 6 and earliers") 3572 3573/* 3574 * Macros for factoring of globals 3575 */ 3576 3577// Interface macros 3578#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3579#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3580#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3581#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3582#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3583#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3584#ifdef PRODUCT 3585#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3586#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3587#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3588#else 3589#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3590#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3591#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3592#endif 3593// Special LP64 flags, product only needed for now. 3594#ifdef _LP64 3595#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3596#else 3597#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3598#endif // _LP64 3599 3600// Implementation macros 3601#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3602#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3603#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3604#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3605#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3606#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3607#ifdef PRODUCT 3608#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3609#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3610#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3611#else 3612#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3613#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3614#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3615#endif 3616#ifdef _LP64 3617#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3618#else 3619#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3620#endif // _LP64 3621 3622RUNTIME_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) 3623 3624RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3625