globals.hpp revision 1697:179464550c7d
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 const char *kind; 94 FlagValueOrigin origin; 95 96 // points to all Flags static array 97 static Flag *flags; 98 99 // number of flags 100 static size_t numFlags; 101 102 static Flag* find_flag(char* name, size_t length); 103 104 bool is_bool() const { return strcmp(type, "bool") == 0; } 105 bool get_bool() const { return *((bool*) addr); } 106 void set_bool(bool value) { *((bool*) addr) = value; } 107 108 bool is_intx() const { return strcmp(type, "intx") == 0; } 109 intx get_intx() const { return *((intx*) addr); } 110 void set_intx(intx value) { *((intx*) addr) = value; } 111 112 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 113 uintx get_uintx() const { return *((uintx*) addr); } 114 void set_uintx(uintx value) { *((uintx*) addr) = value; } 115 116 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 117 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 118 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 119 120 bool is_double() const { return strcmp(type, "double") == 0; } 121 double get_double() const { return *((double*) addr); } 122 void set_double(double value) { *((double*) addr) = value; } 123 124 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 125 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 126 ccstr get_ccstr() const { return *((ccstr*) addr); } 127 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 128 129 bool is_unlocker() const; 130 bool is_unlocked() const; 131 bool is_writeable() const; 132 bool is_external() const; 133 134 void print_on(outputStream* st); 135 void print_as_flag(outputStream* st); 136}; 137 138// debug flags control various aspects of the VM and are global accessible 139 140// use FlagSetting to temporarily change some debug flag 141// e.g. FlagSetting fs(DebugThisAndThat, true); 142// restored to previous value upon leaving scope 143class FlagSetting { 144 bool val; 145 bool* flag; 146 public: 147 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 148 ~FlagSetting() { *flag = val; } 149}; 150 151 152class CounterSetting { 153 intx* counter; 154 public: 155 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 156 ~CounterSetting() { (*counter)--; } 157}; 158 159 160class IntFlagSetting { 161 intx val; 162 intx* flag; 163 public: 164 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 165 ~IntFlagSetting() { *flag = val; } 166}; 167 168 169class DoubleFlagSetting { 170 double val; 171 double* flag; 172 public: 173 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 174 ~DoubleFlagSetting() { *flag = val; } 175}; 176 177 178class CommandLineFlags { 179 public: 180 static bool boolAt(char* name, size_t len, bool* value); 181 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 182 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 183 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 184 185 static bool intxAt(char* name, size_t len, intx* value); 186 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 187 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 188 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 189 190 static bool uintxAt(char* name, size_t len, uintx* value); 191 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 192 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 193 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 194 195 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 196 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 197 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 198 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 199 200 static bool doubleAt(char* name, size_t len, double* value); 201 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 202 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 203 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 204 205 static bool ccstrAt(char* name, size_t len, ccstr* value); 206 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 207 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 208 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 209 210 // Returns false if name is not a command line flag. 211 static bool wasSetOnCmdline(const char* name, bool* value); 212 static void printSetFlags(); 213 214 static void printFlags(); 215 216 static void verify() PRODUCT_RETURN; 217}; 218 219// use this for flags that are true by default in the debug version but 220// false in the optimized version, and vice versa 221#ifdef ASSERT 222#define trueInDebug true 223#define falseInDebug false 224#else 225#define trueInDebug false 226#define falseInDebug true 227#endif 228 229// use this for flags that are true per default in the product build 230// but false in development builds, and vice versa 231#ifdef PRODUCT 232#define trueInProduct true 233#define falseInProduct false 234#else 235#define trueInProduct false 236#define falseInProduct true 237#endif 238 239// use this for flags that are true per default in the tiered build 240// but false in non-tiered builds, and vice versa 241#ifdef TIERED 242#define trueInTiered true 243#define falseInTiered false 244#else 245#define trueInTiered false 246#define falseInTiered true 247#endif 248 249// develop flags are settable / visible only during development and are constant in the PRODUCT version 250// product flags are always settable / visible 251// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 252 253// A flag must be declared with one of the following types: 254// bool, intx, uintx, ccstr. 255// The type "ccstr" is an alias for "const char*" and is used 256// only in this file, because the macrology requires single-token type names. 257 258// Note: Diagnostic options not meant for VM tuning or for product modes. 259// They are to be used for VM quality assurance or field diagnosis 260// of VM bugs. They are hidden so that users will not be encouraged to 261// try them as if they were VM ordinary execution options. However, they 262// are available in the product version of the VM. Under instruction 263// from support engineers, VM customers can turn them on to collect 264// diagnostic information about VM problems. To use a VM diagnostic 265// option, you must first specify +UnlockDiagnosticVMOptions. 266// (This master switch also affects the behavior of -Xprintflags.) 267// 268// experimental flags are in support of features that are not 269// part of the officially supported product, but are available 270// for experimenting with. They could, for example, be performance 271// features that may not have undergone full or rigorous QA, but which may 272// help performance in some cases and released for experimentation 273// by the community of users and developers. This flag also allows one to 274// be able to build a fully supported product that nonetheless also 275// ships with some unsupported, lightly tested, experimental features. 276// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 277// UnlockExperimentalVMOptions flag, which allows the control and 278// modification of the experimental flags. 279// 280// manageable flags are writeable external product flags. 281// They are dynamically writeable through the JDK management interface 282// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 283// These flags are external exported interface (see CCC). The list of 284// manageable flags can be queried programmatically through the management 285// interface. 286// 287// A flag can be made as "manageable" only if 288// - the flag is defined in a CCC as an external exported interface. 289// - the VM implementation supports dynamic setting of the flag. 290// This implies that the VM must *always* query the flag variable 291// and not reuse state related to the flag state at any given time. 292// - you want the flag to be queried programmatically by the customers. 293// 294// product_rw flags are writeable internal product flags. 295// They are like "manageable" flags but for internal/private use. 296// The list of product_rw flags are internal/private flags which 297// may be changed/removed in a future release. It can be set 298// through the management interface to get/set value 299// when the name of flag is supplied. 300// 301// A flag can be made as "product_rw" only if 302// - the VM implementation supports dynamic setting of the flag. 303// This implies that the VM must *always* query the flag variable 304// and not reuse state related to the flag state at any given time. 305// 306// Note that when there is a need to support develop flags to be writeable, 307// it can be done in the same way as product_rw. 308 309#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 310 \ 311 lp64_product(bool, UseCompressedOops, false, \ 312 "Use 32-bit object references in 64-bit VM. " \ 313 "lp64_product means flag is always constant in 32 bit VM") \ 314 \ 315 notproduct(bool, CheckCompressedOops, true, \ 316 "generate checks in encoding/decoding code in debug VM") \ 317 \ 318 product_pd(uintx, HeapBaseMinAddress, \ 319 "OS specific low limit for heap base address") \ 320 \ 321 diagnostic(bool, PrintCompressedOopsMode, false, \ 322 "Print compressed oops base address and encoding mode") \ 323 \ 324 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 325 "Default object alignment in bytes, 8 is minimum") \ 326 \ 327 /* UseMembar is theoretically a temp flag used for memory barrier \ 328 * removal testing. It was supposed to be removed before FCS but has \ 329 * been re-added (see 6401008) */ \ 330 product(bool, UseMembar, false, \ 331 "(Unstable) Issues membars on thread state transitions") \ 332 \ 333 /* Temporary: See 6948537 */ \ 334 experimental(bool, UseMemSetInBOT, true, \ 335 "(Unstable) uses memset in BOT updates in GC code") \ 336 \ 337 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 338 "Enable normal processing of flags relating to field diagnostics")\ 339 \ 340 experimental(bool, UnlockExperimentalVMOptions, false, \ 341 "Enable normal processing of flags relating to experimental features")\ 342 \ 343 product(bool, JavaMonitorsInStackTrace, true, \ 344 "Print info. about Java monitor locks when the stacks are dumped")\ 345 \ 346 product_pd(bool, UseLargePages, \ 347 "Use large page memory") \ 348 \ 349 product_pd(bool, UseLargePagesIndividualAllocation, \ 350 "Allocate large pages individually for better affinity") \ 351 \ 352 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 353 "Fail large pages individual allocation") \ 354 \ 355 develop(bool, TracePageSizes, false, \ 356 "Trace page size selection and usage.") \ 357 \ 358 product(bool, UseNUMA, false, \ 359 "Use NUMA if available") \ 360 \ 361 product(bool, ForceNUMA, false, \ 362 "Force NUMA optimizations on single-node/UMA systems") \ 363 \ 364 product(intx, NUMAChunkResizeWeight, 20, \ 365 "Percentage (0-100) used to weight the current sample when " \ 366 "computing exponentially decaying average for " \ 367 "AdaptiveNUMAChunkSizing") \ 368 \ 369 product(intx, NUMASpaceResizeRate, 1*G, \ 370 "Do not reallocate more that this amount per collection") \ 371 \ 372 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 373 "Enable adaptive chunk sizing for NUMA") \ 374 \ 375 product(bool, NUMAStats, false, \ 376 "Print NUMA stats in detailed heap information") \ 377 \ 378 product(intx, NUMAPageScanRate, 256, \ 379 "Maximum number of pages to include in the page scan procedure") \ 380 \ 381 product_pd(bool, NeedsDeoptSuspend, \ 382 "True for register window machines (sparc/ia64)") \ 383 \ 384 product(intx, UseSSE, 99, \ 385 "Highest supported SSE instructions set on x86/x64") \ 386 \ 387 product(uintx, LargePageSizeInBytes, 0, \ 388 "Large page size (0 to let VM choose the page size") \ 389 \ 390 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 391 "Use large pages if max heap is at least this big") \ 392 \ 393 product(bool, ForceTimeHighResolution, false, \ 394 "Using high time resolution(For Win32 only)") \ 395 \ 396 develop(bool, TraceItables, false, \ 397 "Trace initialization and use of itables") \ 398 \ 399 develop(bool, TracePcPatching, false, \ 400 "Trace usage of frame::patch_pc") \ 401 \ 402 develop(bool, TraceJumps, false, \ 403 "Trace assembly jumps in thread ring buffer") \ 404 \ 405 develop(bool, TraceRelocator, false, \ 406 "Trace the bytecode relocator") \ 407 \ 408 develop(bool, TraceLongCompiles, false, \ 409 "Print out every time compilation is longer than " \ 410 "a given threashold") \ 411 \ 412 develop(bool, SafepointALot, false, \ 413 "Generates a lot of safepoints. Works with " \ 414 "GuaranteedSafepointInterval") \ 415 \ 416 product_pd(bool, BackgroundCompilation, \ 417 "A thread requesting compilation is not blocked during " \ 418 "compilation") \ 419 \ 420 product(bool, PrintVMQWaitTime, false, \ 421 "Prints out the waiting time in VM operation queue") \ 422 \ 423 develop(bool, BailoutToInterpreterForThrows, false, \ 424 "Compiled methods which throws/catches exceptions will be " \ 425 "deopt and intp.") \ 426 \ 427 develop(bool, NoYieldsInMicrolock, false, \ 428 "Disable yields in microlock") \ 429 \ 430 develop(bool, TraceOopMapGeneration, false, \ 431 "Shows oopmap generation") \ 432 \ 433 product(bool, MethodFlushing, true, \ 434 "Reclamation of zombie and not-entrant methods") \ 435 \ 436 develop(bool, VerifyStack, false, \ 437 "Verify stack of each thread when it is entering a runtime call") \ 438 \ 439 develop(bool, ForceUnreachable, false, \ 440 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 441 \ 442 notproduct(bool, StressDerivedPointers, false, \ 443 "Force scavenge when a derived pointers is detected on stack " \ 444 "after rtm call") \ 445 \ 446 develop(bool, TraceDerivedPointers, false, \ 447 "Trace traversal of derived pointers on stack") \ 448 \ 449 notproduct(bool, TraceCodeBlobStacks, false, \ 450 "Trace stack-walk of codeblobs") \ 451 \ 452 product(bool, PrintJNIResolving, false, \ 453 "Used to implement -v:jni") \ 454 \ 455 notproduct(bool, PrintRewrites, false, \ 456 "Print methods that are being rewritten") \ 457 \ 458 product(bool, UseInlineCaches, true, \ 459 "Use Inline Caches for virtual calls ") \ 460 \ 461 develop(bool, InlineArrayCopy, true, \ 462 "inline arraycopy native that is known to be part of " \ 463 "base library DLL") \ 464 \ 465 develop(bool, InlineObjectHash, true, \ 466 "inline Object::hashCode() native that is known to be part " \ 467 "of base library DLL") \ 468 \ 469 develop(bool, InlineObjectCopy, true, \ 470 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 471 \ 472 develop(bool, InlineNatives, true, \ 473 "inline natives that are known to be part of base library DLL") \ 474 \ 475 develop(bool, InlineMathNatives, true, \ 476 "inline SinD, CosD, etc.") \ 477 \ 478 develop(bool, InlineClassNatives, true, \ 479 "inline Class.isInstance, etc") \ 480 \ 481 develop(bool, InlineAtomicLong, true, \ 482 "inline sun.misc.AtomicLong") \ 483 \ 484 develop(bool, InlineThreadNatives, true, \ 485 "inline Thread.currentThread, etc") \ 486 \ 487 develop(bool, InlineReflectionGetCallerClass, true, \ 488 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 489 "of base library DLL") \ 490 \ 491 develop(bool, InlineUnsafeOps, true, \ 492 "inline memory ops (native methods) from sun.misc.Unsafe") \ 493 \ 494 develop(bool, ConvertCmpD2CmpF, true, \ 495 "Convert cmpD to cmpF when one input is constant in float range") \ 496 \ 497 develop(bool, ConvertFloat2IntClipping, true, \ 498 "Convert float2int clipping idiom to integer clipping") \ 499 \ 500 develop(bool, SpecialStringCompareTo, true, \ 501 "special version of string compareTo") \ 502 \ 503 develop(bool, SpecialStringIndexOf, true, \ 504 "special version of string indexOf") \ 505 \ 506 develop(bool, SpecialStringEquals, true, \ 507 "special version of string equals") \ 508 \ 509 develop(bool, SpecialArraysEquals, true, \ 510 "special version of Arrays.equals(char[],char[])") \ 511 \ 512 product(bool, UseSSE42Intrinsics, false, \ 513 "SSE4.2 versions of intrinsics") \ 514 \ 515 develop(bool, TraceCallFixup, false, \ 516 "traces all call fixups") \ 517 \ 518 develop(bool, DeoptimizeALot, false, \ 519 "deoptimize at every exit from the runtime system") \ 520 \ 521 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 522 "a comma separated list of bcis to deoptimize at") \ 523 \ 524 product(bool, DeoptimizeRandom, false, \ 525 "deoptimize random frames on random exit from the runtime system")\ 526 \ 527 notproduct(bool, ZombieALot, false, \ 528 "creates zombies (non-entrant) at exit from the runt. system") \ 529 \ 530 notproduct(bool, WalkStackALot, false, \ 531 "trace stack (no print) at every exit from the runtime system") \ 532 \ 533 develop(bool, Debugging, false, \ 534 "set when executing debug methods in debug.ccp " \ 535 "(to prevent triggering assertions)") \ 536 \ 537 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 538 "Enable strict checks that safepoints cannot happen for threads " \ 539 "that used No_Safepoint_Verifier") \ 540 \ 541 notproduct(bool, VerifyLastFrame, false, \ 542 "Verify oops on last frame on entry to VM") \ 543 \ 544 develop(bool, TraceHandleAllocation, false, \ 545 "Prints out warnings when suspicious many handles are allocated") \ 546 \ 547 product(bool, UseCompilerSafepoints, true, \ 548 "Stop at safepoints in compiled code") \ 549 \ 550 product(bool, UseSplitVerifier, true, \ 551 "use split verifier with StackMapTable attributes") \ 552 \ 553 product(bool, FailOverToOldVerifier, true, \ 554 "fail over to old verifier when split verifier fails") \ 555 \ 556 develop(bool, ShowSafepointMsgs, false, \ 557 "Show msg. about safepoint synch.") \ 558 \ 559 product(bool, SafepointTimeout, false, \ 560 "Time out and warn or fail after SafepointTimeoutDelay " \ 561 "milliseconds if failed to reach safepoint") \ 562 \ 563 develop(bool, DieOnSafepointTimeout, false, \ 564 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 565 \ 566 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 567 /* typically, at most a few retries are needed */ \ 568 product(intx, SuspendRetryCount, 50, \ 569 "Maximum retry count for an external suspend request") \ 570 \ 571 product(intx, SuspendRetryDelay, 5, \ 572 "Milliseconds to delay per retry (* current_retry_count)") \ 573 \ 574 product(bool, AssertOnSuspendWaitFailure, false, \ 575 "Assert/Guarantee on external suspend wait failure") \ 576 \ 577 product(bool, TraceSuspendWaitFailures, false, \ 578 "Trace external suspend wait failures") \ 579 \ 580 product(bool, MaxFDLimit, true, \ 581 "Bump the number of file descriptors to max in solaris.") \ 582 \ 583 notproduct(bool, LogEvents, trueInDebug, \ 584 "Enable Event log") \ 585 \ 586 product(bool, BytecodeVerificationRemote, true, \ 587 "Enables the Java bytecode verifier for remote classes") \ 588 \ 589 product(bool, BytecodeVerificationLocal, false, \ 590 "Enables the Java bytecode verifier for local classes") \ 591 \ 592 develop(bool, ForceFloatExceptions, trueInDebug, \ 593 "Force exceptions on FP stack under/overflow") \ 594 \ 595 develop(bool, SoftMatchFailure, trueInProduct, \ 596 "If the DFA fails to match a node, print a message and bail out") \ 597 \ 598 develop(bool, VerifyStackAtCalls, false, \ 599 "Verify that the stack pointer is unchanged after calls") \ 600 \ 601 develop(bool, TraceJavaAssertions, false, \ 602 "Trace java language assertions") \ 603 \ 604 notproduct(bool, CheckAssertionStatusDirectives, false, \ 605 "temporary - see javaClasses.cpp") \ 606 \ 607 notproduct(bool, PrintMallocFree, false, \ 608 "Trace calls to C heap malloc/free allocation") \ 609 \ 610 product(bool, PrintOopAddress, false, \ 611 "Always print the location of the oop") \ 612 \ 613 notproduct(bool, VerifyCodeCacheOften, false, \ 614 "Verify compiled-code cache often") \ 615 \ 616 develop(bool, ZapDeadCompiledLocals, false, \ 617 "Zap dead locals in compiler frames") \ 618 \ 619 notproduct(bool, ZapDeadLocalsOld, false, \ 620 "Zap dead locals (old version, zaps all frames when " \ 621 "entering the VM") \ 622 \ 623 notproduct(bool, CheckOopishValues, false, \ 624 "Warn if value contains oop ( requires ZapDeadLocals)") \ 625 \ 626 develop(bool, UseMallocOnly, false, \ 627 "use only malloc/free for allocation (no resource area/arena)") \ 628 \ 629 develop(bool, PrintMalloc, false, \ 630 "print all malloc/free calls") \ 631 \ 632 develop(bool, ZapResourceArea, trueInDebug, \ 633 "Zap freed resource/arena space with 0xABABABAB") \ 634 \ 635 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 636 "Zap freed VM handle space with 0xBCBCBCBC") \ 637 \ 638 develop(bool, ZapJNIHandleArea, trueInDebug, \ 639 "Zap freed JNI handle space with 0xFEFEFEFE") \ 640 \ 641 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 642 "Zap unused heap space with 0xBAADBABE") \ 643 \ 644 develop(bool, TraceZapUnusedHeapArea, false, \ 645 "Trace zapping of unused heap space") \ 646 \ 647 develop(bool, CheckZapUnusedHeapArea, false, \ 648 "Check zapping of unused heap space") \ 649 \ 650 develop(bool, ZapFillerObjects, trueInDebug, \ 651 "Zap filler objects with 0xDEAFBABE") \ 652 \ 653 develop(bool, PrintVMMessages, true, \ 654 "Print vm messages on console") \ 655 \ 656 product(bool, PrintGCApplicationConcurrentTime, false, \ 657 "Print the time the application has been running") \ 658 \ 659 product(bool, PrintGCApplicationStoppedTime, false, \ 660 "Print the time the application has been stopped") \ 661 \ 662 notproduct(uintx, ErrorHandlerTest, 0, \ 663 "If > 0, provokes an error after VM initialization; the value" \ 664 "determines which error to provoke. See test_error_handler()" \ 665 "in debug.cpp.") \ 666 \ 667 develop(bool, Verbose, false, \ 668 "Prints additional debugging information from other modes") \ 669 \ 670 develop(bool, PrintMiscellaneous, false, \ 671 "Prints uncategorized debugging information (requires +Verbose)") \ 672 \ 673 develop(bool, WizardMode, false, \ 674 "Prints much more debugging information") \ 675 \ 676 product(bool, ShowMessageBoxOnError, false, \ 677 "Keep process alive on VM fatal error") \ 678 \ 679 product_pd(bool, UseOSErrorReporting, \ 680 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 681 \ 682 product(bool, SuppressFatalErrorMessage, false, \ 683 "Do NO Fatal Error report [Avoid deadlock]") \ 684 \ 685 product(ccstrlist, OnError, "", \ 686 "Run user-defined commands on fatal error; see VMError.cpp " \ 687 "for examples") \ 688 \ 689 product(ccstrlist, OnOutOfMemoryError, "", \ 690 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 691 \ 692 manageable(bool, HeapDumpBeforeFullGC, false, \ 693 "Dump heap to file before any major stop-world GC") \ 694 \ 695 manageable(bool, HeapDumpAfterFullGC, false, \ 696 "Dump heap to file after any major stop-world GC") \ 697 \ 698 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 699 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 700 \ 701 manageable(ccstr, HeapDumpPath, NULL, \ 702 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 703 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 704 "in the working directory)") \ 705 \ 706 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 707 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 708 "when the heap usage is larger than this") \ 709 \ 710 develop(uintx, HeapDumpSegmentSize, 1*G, \ 711 "Approximate segment size when generating a segmented heap dump") \ 712 \ 713 develop(bool, BreakAtWarning, false, \ 714 "Execute breakpoint upon encountering VM warning") \ 715 \ 716 product_pd(bool, UseVectoredExceptions, \ 717 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 718 \ 719 develop(bool, TraceVMOperation, false, \ 720 "Trace vm operations") \ 721 \ 722 develop(bool, UseFakeTimers, false, \ 723 "Tells whether the VM should use system time or a fake timer") \ 724 \ 725 diagnostic(bool, LogCompilation, false, \ 726 "Log compilation activity in detail to hotspot.log or LogFile") \ 727 \ 728 product(bool, PrintCompilation, false, \ 729 "Print compilations") \ 730 \ 731 diagnostic(bool, TraceNMethodInstalls, false, \ 732 "Trace nmethod intallation") \ 733 \ 734 diagnostic(intx, ScavengeRootsInCode, 0, \ 735 "0: do not allow scavengable oops in the code cache; " \ 736 "1: allow scavenging from the code cache; " \ 737 "2: emit as many constants as the compiler can see") \ 738 \ 739 diagnostic(bool, TraceOSRBreakpoint, false, \ 740 "Trace OSR Breakpoint ") \ 741 \ 742 diagnostic(bool, TraceCompileTriggered, false, \ 743 "Trace compile triggered") \ 744 \ 745 diagnostic(bool, TraceTriggers, false, \ 746 "Trace triggers") \ 747 \ 748 product(bool, AlwaysRestoreFPU, false, \ 749 "Restore the FPU control word after every JNI call (expensive)") \ 750 \ 751 notproduct(bool, PrintCompilation2, false, \ 752 "Print additional statistics per compilation") \ 753 \ 754 diagnostic(bool, PrintAdapterHandlers, false, \ 755 "Print code generated for i2c/c2i adapters") \ 756 \ 757 develop(bool, VerifyAdapterSharing, false, \ 758 "Verify that the code for shared adapters is the equivalent") \ 759 \ 760 diagnostic(bool, PrintAssembly, false, \ 761 "Print assembly code (using external disassembler.so)") \ 762 \ 763 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 764 "Options string passed to disassembler.so") \ 765 \ 766 diagnostic(bool, PrintNMethods, false, \ 767 "Print assembly code for nmethods when generated") \ 768 \ 769 diagnostic(bool, PrintNativeNMethods, false, \ 770 "Print assembly code for native nmethods when generated") \ 771 \ 772 develop(bool, PrintDebugInfo, false, \ 773 "Print debug information for all nmethods when generated") \ 774 \ 775 develop(bool, PrintRelocations, false, \ 776 "Print relocation information for all nmethods when generated") \ 777 \ 778 develop(bool, PrintDependencies, false, \ 779 "Print dependency information for all nmethods when generated") \ 780 \ 781 develop(bool, PrintExceptionHandlers, false, \ 782 "Print exception handler tables for all nmethods when generated") \ 783 \ 784 develop(bool, InterceptOSException, false, \ 785 "Starts debugger when an implicit OS (e.g., NULL) " \ 786 "exception happens") \ 787 \ 788 notproduct(bool, PrintCodeCache, false, \ 789 "Print the compiled_code cache when exiting") \ 790 \ 791 develop(bool, PrintCodeCache2, false, \ 792 "Print detailed info on the compiled_code cache when exiting") \ 793 \ 794 diagnostic(bool, PrintStubCode, false, \ 795 "Print generated stub code") \ 796 \ 797 product(bool, StackTraceInThrowable, true, \ 798 "Collect backtrace in throwable when exception happens") \ 799 \ 800 product(bool, OmitStackTraceInFastThrow, true, \ 801 "Omit backtraces for some 'hot' exceptions in optimized code") \ 802 \ 803 product(bool, ProfilerPrintByteCodeStatistics, false, \ 804 "Prints byte code statictics when dumping profiler output") \ 805 \ 806 product(bool, ProfilerRecordPC, false, \ 807 "Collects tick for each 16 byte interval of compiled code") \ 808 \ 809 product(bool, ProfileVM, false, \ 810 "Profiles ticks that fall within VM (either in the VM Thread " \ 811 "or VM code called through stubs)") \ 812 \ 813 product(bool, ProfileIntervals, false, \ 814 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 815 \ 816 notproduct(bool, ProfilerCheckIntervals, false, \ 817 "Collect and print info on spacing of profiler ticks") \ 818 \ 819 develop(bool, PrintJVMWarnings, false, \ 820 "Prints warnings for unimplemented JVM functions") \ 821 \ 822 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 823 "Prints warnings for stalled SpinLocks") \ 824 \ 825 develop(bool, InitializeJavaLangSystem, true, \ 826 "Initialize java.lang.System - turn off for individual " \ 827 "method debugging") \ 828 \ 829 develop(bool, InitializeJavaLangString, true, \ 830 "Initialize java.lang.String - turn off for individual " \ 831 "method debugging") \ 832 \ 833 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 834 "Initialize various error and exception classes - turn off for " \ 835 "individual method debugging") \ 836 \ 837 product(bool, RegisterFinalizersAtInit, true, \ 838 "Register finalizable objects at end of Object.<init> or " \ 839 "after allocation") \ 840 \ 841 develop(bool, RegisterReferences, true, \ 842 "Tells whether the VM should register soft/weak/final/phantom " \ 843 "references") \ 844 \ 845 develop(bool, IgnoreRewrites, false, \ 846 "Supress rewrites of bytecodes in the oopmap generator. " \ 847 "This is unsafe!") \ 848 \ 849 develop(bool, PrintCodeCacheExtension, false, \ 850 "Print extension of code cache") \ 851 \ 852 develop(bool, UsePrivilegedStack, true, \ 853 "Enable the security JVM functions") \ 854 \ 855 develop(bool, IEEEPrecision, true, \ 856 "Enables IEEE precision (for INTEL only)") \ 857 \ 858 develop(bool, ProtectionDomainVerification, true, \ 859 "Verifies protection domain before resolution in system " \ 860 "dictionary") \ 861 \ 862 product(bool, ClassUnloading, true, \ 863 "Do unloading of classes") \ 864 \ 865 diagnostic(bool, LinkWellKnownClasses, false, \ 866 "Resolve a well known class as soon as its name is seen") \ 867 \ 868 develop(bool, DisableStartThread, false, \ 869 "Disable starting of additional Java threads " \ 870 "(for debugging only)") \ 871 \ 872 develop(bool, MemProfiling, false, \ 873 "Write memory usage profiling to log file") \ 874 \ 875 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 876 "Prints the system dictionary at exit") \ 877 \ 878 diagnostic(bool, UnsyncloadClass, false, \ 879 "Unstable: VM calls loadClass unsynchronized. Custom " \ 880 "class loader must call VM synchronized for findClass " \ 881 "and defineClass.") \ 882 \ 883 product(bool, AlwaysLockClassLoader, false, \ 884 "Require the VM to acquire the class loader lock before calling " \ 885 "loadClass() even for class loaders registering " \ 886 "as parallel capable") \ 887 \ 888 product(bool, AllowParallelDefineClass, false, \ 889 "Allow parallel defineClass requests for class loaders " \ 890 "registering as parallel capable") \ 891 \ 892 product(bool, MustCallLoadClassInternal, false, \ 893 "Call loadClassInternal() rather than loadClass()") \ 894 \ 895 product_pd(bool, DontYieldALot, \ 896 "Throw away obvious excess yield calls (for SOLARIS only)") \ 897 \ 898 product_pd(bool, ConvertSleepToYield, \ 899 "Converts sleep(0) to thread yield " \ 900 "(may be off for SOLARIS to improve GUI)") \ 901 \ 902 product(bool, ConvertYieldToSleep, false, \ 903 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 904 "behavior (SOLARIS only)") \ 905 \ 906 product(bool, UseBoundThreads, true, \ 907 "Bind user level threads to kernel threads (for SOLARIS only)") \ 908 \ 909 develop(bool, UseDetachedThreads, true, \ 910 "Use detached threads that are recycled upon termination " \ 911 "(for SOLARIS only)") \ 912 \ 913 product(bool, UseLWPSynchronization, true, \ 914 "Use LWP-based instead of libthread-based synchronization " \ 915 "(SPARC only)") \ 916 \ 917 product(ccstr, SyncKnobs, NULL, \ 918 "(Unstable) Various monitor synchronization tunables") \ 919 \ 920 product(intx, EmitSync, 0, \ 921 "(Unsafe,Unstable) " \ 922 " Controls emission of inline sync fast-path code") \ 923 \ 924 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 925 \ 926 product(intx, MonitorBound, 0, "Bound Monitor population") \ 927 \ 928 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 929 \ 930 product(intx, Atomics, 0, \ 931 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 932 \ 933 product(intx, FenceInstruction, 0, \ 934 "(Unsafe,Unstable) Experimental") \ 935 \ 936 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 937 \ 938 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 939 \ 940 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 941 \ 942 product(intx, hashCode, 0, \ 943 "(Unstable) select hashCode generation algorithm" ) \ 944 \ 945 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 946 "(Unstable, Linux-specific)" \ 947 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 948 \ 949 product(bool, FilterSpuriousWakeups, true, \ 950 "Prevent spurious or premature wakeups from object.wait " \ 951 "(Solaris only)") \ 952 \ 953 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 954 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 955 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 956 \ 957 develop(bool, UsePthreads, false, \ 958 "Use pthread-based instead of libthread-based synchronization " \ 959 "(SPARC only)") \ 960 \ 961 product(bool, AdjustConcurrency, false, \ 962 "call thr_setconcurrency at thread create time to avoid " \ 963 "LWP starvation on MP systems (For Solaris Only)") \ 964 \ 965 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 966 "Should the system attempt to update the compiler file when " \ 967 "an error occurs?") \ 968 \ 969 product(bool, ReduceSignalUsage, false, \ 970 "Reduce the use of OS signals in Java and/or the VM") \ 971 \ 972 notproduct(bool, ValidateMarkSweep, false, \ 973 "Do extra validation during MarkSweep collection") \ 974 \ 975 notproduct(bool, RecordMarkSweepCompaction, false, \ 976 "Enable GC-to-GC recording and querying of compaction during " \ 977 "MarkSweep") \ 978 \ 979 develop_pd(bool, ShareVtableStubs, \ 980 "Share vtable stubs (smaller code but worse branch prediction") \ 981 \ 982 develop(bool, LoadLineNumberTables, true, \ 983 "Tells whether the class file parser loads line number tables") \ 984 \ 985 develop(bool, LoadLocalVariableTables, true, \ 986 "Tells whether the class file parser loads local variable tables")\ 987 \ 988 develop(bool, LoadLocalVariableTypeTables, true, \ 989 "Tells whether the class file parser loads local variable type tables")\ 990 \ 991 product(bool, AllowUserSignalHandlers, false, \ 992 "Do not complain if the application installs signal handlers " \ 993 "(Solaris & Linux only)") \ 994 \ 995 product(bool, UseSignalChaining, true, \ 996 "Use signal-chaining to invoke signal handlers installed " \ 997 "by the application (Solaris & Linux only)") \ 998 \ 999 product(bool, UseAltSigs, false, \ 1000 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1001 "internal signals (Solaris only)") \ 1002 \ 1003 product(bool, UseSpinning, false, \ 1004 "Use spinning in monitor inflation and before entry") \ 1005 \ 1006 product(bool, PreSpinYield, false, \ 1007 "Yield before inner spinning loop") \ 1008 \ 1009 product(bool, PostSpinYield, true, \ 1010 "Yield after inner spinning loop") \ 1011 \ 1012 product(bool, AllowJNIEnvProxy, false, \ 1013 "Allow JNIEnv proxies for jdbx") \ 1014 \ 1015 product(bool, JNIDetachReleasesMonitors, true, \ 1016 "JNI DetachCurrentThread releases monitors owned by thread") \ 1017 \ 1018 product(bool, RestoreMXCSROnJNICalls, false, \ 1019 "Restore MXCSR when returning from JNI calls") \ 1020 \ 1021 product(bool, CheckJNICalls, false, \ 1022 "Verify all arguments to JNI calls") \ 1023 \ 1024 product(bool, UseFastJNIAccessors, true, \ 1025 "Use optimized versions of Get<Primitive>Field") \ 1026 \ 1027 product(bool, EagerXrunInit, false, \ 1028 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1029 " but not all -Xrun libraries may support the state of the VM at this time") \ 1030 \ 1031 product(bool, PreserveAllAnnotations, false, \ 1032 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1033 \ 1034 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1035 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1036 \ 1037 product(bool, LazyBootClassLoader, true, \ 1038 "Enable/disable lazy opening of boot class path entries") \ 1039 \ 1040 diagnostic(bool, UseIncDec, true, \ 1041 "Use INC, DEC instructions on x86") \ 1042 \ 1043 product(bool, UseNewLongLShift, false, \ 1044 "Use optimized bitwise shift left") \ 1045 \ 1046 product(bool, UseStoreImmI16, true, \ 1047 "Use store immediate 16-bits value instruction on x86") \ 1048 \ 1049 product(bool, UseAddressNop, false, \ 1050 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1051 \ 1052 product(bool, UseXmmLoadAndClearUpper, true, \ 1053 "Load low part of XMM register and clear upper part") \ 1054 \ 1055 product(bool, UseXmmRegToRegMoveAll, false, \ 1056 "Copy all XMM register bits when moving value between registers") \ 1057 \ 1058 product(bool, UseXmmI2D, false, \ 1059 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1060 \ 1061 product(bool, UseXmmI2F, false, \ 1062 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1063 \ 1064 product(bool, UseXMMForArrayCopy, false, \ 1065 "Use SSE2 MOVQ instruction for Arraycopy") \ 1066 \ 1067 product(bool, UseUnalignedLoadStores, false, \ 1068 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1069 \ 1070 product(intx, FieldsAllocationStyle, 1, \ 1071 "0 - type based with oops first, 1 - with oops last, " \ 1072 "2 - oops in super and sub classes are together") \ 1073 \ 1074 product(bool, CompactFields, true, \ 1075 "Allocate nonstatic fields in gaps between previous fields") \ 1076 \ 1077 notproduct(bool, PrintCompactFieldsSavings, false, \ 1078 "Print how many words were saved with CompactFields") \ 1079 \ 1080 product(bool, UseBiasedLocking, true, \ 1081 "Enable biased locking in JVM") \ 1082 \ 1083 product(intx, BiasedLockingStartupDelay, 4000, \ 1084 "Number of milliseconds to wait before enabling biased locking") \ 1085 \ 1086 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1087 "Print statistics of biased locking in JVM") \ 1088 \ 1089 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1090 "Threshold of number of revocations per type to try to " \ 1091 "rebias all objects in the heap of that type") \ 1092 \ 1093 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1094 "Threshold of number of revocations per type to permanently " \ 1095 "revoke biases of all objects in the heap of that type") \ 1096 \ 1097 product(intx, BiasedLockingDecayTime, 25000, \ 1098 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1099 "type after previous bulk rebias") \ 1100 \ 1101 /* tracing */ \ 1102 \ 1103 notproduct(bool, TraceRuntimeCalls, false, \ 1104 "Trace run-time calls") \ 1105 \ 1106 develop(bool, TraceJNICalls, false, \ 1107 "Trace JNI calls") \ 1108 \ 1109 notproduct(bool, TraceJVMCalls, false, \ 1110 "Trace JVM calls") \ 1111 \ 1112 product(ccstr, TraceJVMTI, NULL, \ 1113 "Trace flags for JVMTI functions and events") \ 1114 \ 1115 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1116 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1117 \ 1118 /* This option can change an EMCP method into an obsolete method. */ \ 1119 /* This can affect tests that except specific methods to be EMCP. */ \ 1120 /* This option should be used with caution. */ \ 1121 product(bool, StressLdcRewrite, false, \ 1122 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1123 \ 1124 product(intx, TraceRedefineClasses, 0, \ 1125 "Trace level for JVMTI RedefineClasses") \ 1126 \ 1127 develop(bool, StressMethodComparator, false, \ 1128 "run the MethodComparator on all loaded methods") \ 1129 \ 1130 /* change to false by default sometime after Mustang */ \ 1131 product(bool, VerifyMergedCPBytecodes, true, \ 1132 "Verify bytecodes after RedefineClasses constant pool merging") \ 1133 \ 1134 develop(bool, TraceJNIHandleAllocation, false, \ 1135 "Trace allocation/deallocation of JNI handle blocks") \ 1136 \ 1137 develop(bool, TraceThreadEvents, false, \ 1138 "Trace all thread events") \ 1139 \ 1140 develop(bool, TraceBytecodes, false, \ 1141 "Trace bytecode execution") \ 1142 \ 1143 develop(bool, TraceClassInitialization, false, \ 1144 "Trace class initialization") \ 1145 \ 1146 develop(bool, TraceExceptions, false, \ 1147 "Trace exceptions") \ 1148 \ 1149 develop(bool, TraceICs, false, \ 1150 "Trace inline cache changes") \ 1151 \ 1152 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1153 "Trace method invocation counter overflow") \ 1154 \ 1155 develop(bool, TraceInlineCacheClearing, false, \ 1156 "Trace clearing of inline caches in nmethods") \ 1157 \ 1158 develop(bool, TraceDependencies, false, \ 1159 "Trace dependencies") \ 1160 \ 1161 develop(bool, VerifyDependencies, trueInDebug, \ 1162 "Exercise and verify the compilation dependency mechanism") \ 1163 \ 1164 develop(bool, TraceNewOopMapGeneration, false, \ 1165 "Trace OopMapGeneration") \ 1166 \ 1167 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1168 "Trace OopMapGeneration: print detailed cell states") \ 1169 \ 1170 develop(bool, TimeOopMap, false, \ 1171 "Time calls to GenerateOopMap::compute_map() in sum") \ 1172 \ 1173 develop(bool, TimeOopMap2, false, \ 1174 "Time calls to GenerateOopMap::compute_map() individually") \ 1175 \ 1176 develop(bool, TraceMonitorMismatch, false, \ 1177 "Trace monitor matching failures during OopMapGeneration") \ 1178 \ 1179 develop(bool, TraceOopMapRewrites, false, \ 1180 "Trace rewritting of method oops during oop map generation") \ 1181 \ 1182 develop(bool, TraceSafepoint, false, \ 1183 "Trace safepoint operations") \ 1184 \ 1185 develop(bool, TraceICBuffer, false, \ 1186 "Trace usage of IC buffer") \ 1187 \ 1188 develop(bool, TraceCompiledIC, false, \ 1189 "Trace changes of compiled IC") \ 1190 \ 1191 notproduct(bool, TraceZapDeadLocals, false, \ 1192 "Trace zapping dead locals") \ 1193 \ 1194 develop(bool, TraceStartupTime, false, \ 1195 "Trace setup time") \ 1196 \ 1197 develop(bool, TraceHPI, false, \ 1198 "Trace Host Porting Interface (HPI)") \ 1199 \ 1200 product(ccstr, HPILibPath, NULL, \ 1201 "Specify alternate path to HPI library") \ 1202 \ 1203 develop(bool, TraceProtectionDomainVerification, false, \ 1204 "Trace protection domain verifcation") \ 1205 \ 1206 develop(bool, TraceClearedExceptions, false, \ 1207 "Prints when an exception is forcibly cleared") \ 1208 \ 1209 product(bool, TraceClassResolution, false, \ 1210 "Trace all constant pool resolutions (for debugging)") \ 1211 \ 1212 product(bool, TraceBiasedLocking, false, \ 1213 "Trace biased locking in JVM") \ 1214 \ 1215 product(bool, TraceMonitorInflation, false, \ 1216 "Trace monitor inflation in JVM") \ 1217 \ 1218 /* assembler */ \ 1219 product(bool, Use486InstrsOnly, false, \ 1220 "Use 80486 Compliant instruction subset") \ 1221 \ 1222 /* gc */ \ 1223 \ 1224 product(bool, UseSerialGC, false, \ 1225 "Use the serial garbage collector") \ 1226 \ 1227 product(bool, UseG1GC, false, \ 1228 "Use the Garbage-First garbage collector") \ 1229 \ 1230 product(bool, UseParallelGC, false, \ 1231 "Use the Parallel Scavenge garbage collector") \ 1232 \ 1233 product(bool, UseParallelOldGC, false, \ 1234 "Use the Parallel Old garbage collector") \ 1235 \ 1236 product(bool, UseParallelOldGCCompacting, true, \ 1237 "In the Parallel Old garbage collector use parallel compaction") \ 1238 \ 1239 product(bool, UseParallelDensePrefixUpdate, true, \ 1240 "In the Parallel Old garbage collector use parallel dense" \ 1241 " prefix update") \ 1242 \ 1243 product(uintx, HeapMaximumCompactionInterval, 20, \ 1244 "How often should we maximally compact the heap (not allowing " \ 1245 "any dead space)") \ 1246 \ 1247 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1248 "The collection count for the first maximum compaction") \ 1249 \ 1250 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1251 "In the Parallel Old garbage collector maximum compaction for " \ 1252 "a system GC") \ 1253 \ 1254 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1255 "The mean used by the par compact dead wood" \ 1256 "limiter (a number between 0-100).") \ 1257 \ 1258 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1259 "The standard deviation used by the par compact dead wood" \ 1260 "limiter (a number between 0-100).") \ 1261 \ 1262 product(bool, UseParallelOldGCDensePrefix, true, \ 1263 "Use a dense prefix with the Parallel Old garbage collector") \ 1264 \ 1265 product(uintx, ParallelGCThreads, 0, \ 1266 "Number of parallel threads parallel gc will use") \ 1267 \ 1268 develop(bool, ParallelOldGCSplitALot, false, \ 1269 "Provoke splitting (copying data from a young gen space to" \ 1270 "multiple destination spaces)") \ 1271 \ 1272 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1273 "How often to provoke splitting a young gen space") \ 1274 \ 1275 develop(bool, TraceRegionTasksQueuing, false, \ 1276 "Trace the queuing of the region tasks") \ 1277 \ 1278 product(uintx, ConcGCThreads, 0, \ 1279 "Number of threads concurrent gc will use") \ 1280 \ 1281 product(uintx, YoungPLABSize, 4096, \ 1282 "Size of young gen promotion labs (in HeapWords)") \ 1283 \ 1284 product(uintx, OldPLABSize, 1024, \ 1285 "Size of old gen promotion labs (in HeapWords)") \ 1286 \ 1287 product(uintx, GCTaskTimeStampEntries, 200, \ 1288 "Number of time stamp entries per gc worker thread") \ 1289 \ 1290 product(bool, AlwaysTenure, false, \ 1291 "Always tenure objects in eden. (ParallelGC only)") \ 1292 \ 1293 product(bool, NeverTenure, false, \ 1294 "Never tenure objects in eden, May tenure on overflow " \ 1295 "(ParallelGC only)") \ 1296 \ 1297 product(bool, ScavengeBeforeFullGC, true, \ 1298 "Scavenge youngest generation before each full GC, " \ 1299 "used with UseParallelGC") \ 1300 \ 1301 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1302 "Allow scavenges to occur when to_space contains objects.") \ 1303 \ 1304 product(bool, UseConcMarkSweepGC, false, \ 1305 "Use Concurrent Mark-Sweep GC in the old generation") \ 1306 \ 1307 product(bool, ExplicitGCInvokesConcurrent, false, \ 1308 "A System.gc() request invokes a concurrent collection;" \ 1309 " (effective only when UseConcMarkSweepGC)") \ 1310 \ 1311 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1312 "A System.gc() request invokes a concurrent collection and " \ 1313 "also unloads classes during such a concurrent gc cycle " \ 1314 "(effective only when UseConcMarkSweepGC)") \ 1315 \ 1316 product(bool, GCLockerInvokesConcurrent, false, \ 1317 "The exit of a JNI CS necessitating a scavenge also" \ 1318 " kicks off a bkgrd concurrent collection") \ 1319 \ 1320 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1321 "Use Adaptive Free Lists in the CMS generation") \ 1322 \ 1323 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1324 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1325 \ 1326 develop(bool, RotateCMSCollectionTypes, false, \ 1327 "Rotate the CMS collections among concurrent and STW") \ 1328 \ 1329 product(bool, UseCMSBestFit, true, \ 1330 "Use CMS best fit allocation strategy") \ 1331 \ 1332 product(bool, UseCMSCollectionPassing, true, \ 1333 "Use passing of collection from background to foreground") \ 1334 \ 1335 product(bool, UseParNewGC, false, \ 1336 "Use parallel threads in the new generation.") \ 1337 \ 1338 product(bool, ParallelGCVerbose, false, \ 1339 "Verbose output for parallel GC.") \ 1340 \ 1341 product(intx, ParallelGCBufferWastePct, 10, \ 1342 "wasted fraction of parallel allocation buffer.") \ 1343 \ 1344 product(bool, ParallelGCRetainPLAB, true, \ 1345 "Retain parallel allocation buffers across scavenges.") \ 1346 \ 1347 product(intx, TargetPLABWastePct, 10, \ 1348 "target wasted space in last buffer as pct of overall allocation")\ 1349 \ 1350 product(uintx, PLABWeight, 75, \ 1351 "Percentage (0-100) used to weight the current sample when" \ 1352 "computing exponentially decaying average for ResizePLAB.") \ 1353 \ 1354 product(bool, ResizePLAB, true, \ 1355 "Dynamically resize (survivor space) promotion labs") \ 1356 \ 1357 product(bool, PrintPLAB, false, \ 1358 "Print (survivor space) promotion labs sizing decisions") \ 1359 \ 1360 product(intx, ParGCArrayScanChunk, 50, \ 1361 "Scan a subset and push remainder, if array is bigger than this") \ 1362 \ 1363 product(bool, ParGCUseLocalOverflow, false, \ 1364 "Instead of a global overflow list, use local overflow stacks") \ 1365 \ 1366 product(bool, ParGCTrimOverflow, true, \ 1367 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1368 \ 1369 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1370 "Whether we should simulate work queue overflow in ParNew") \ 1371 \ 1372 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1373 "An `interval' counter that determines how frequently " \ 1374 "we simulate overflow; a smaller number increases frequency") \ 1375 \ 1376 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1377 "The desired number of objects to claim from the overflow list") \ 1378 \ 1379 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1380 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1381 "parallel GC.") \ 1382 \ 1383 product(uintx, OldPLABWeight, 50, \ 1384 "Percentage (0-100) used to weight the current sample when" \ 1385 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1386 \ 1387 product(bool, ResizeOldPLAB, true, \ 1388 "Dynamically resize (old gen) promotion labs") \ 1389 \ 1390 product(bool, PrintOldPLAB, false, \ 1391 "Print (old gen) promotion labs sizing decisions") \ 1392 \ 1393 product(uintx, CMSOldPLABMin, 16, \ 1394 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1395 \ 1396 product(uintx, CMSOldPLABMax, 1024, \ 1397 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1398 \ 1399 product(uintx, CMSOldPLABNumRefills, 4, \ 1400 "Nominal number of refills of CMS gen promotion lab cache" \ 1401 " per worker per block size") \ 1402 \ 1403 product(bool, CMSOldPLABResizeQuicker, false, \ 1404 "Whether to react on-the-fly during a scavenge to a sudden" \ 1405 " change in block demand rate") \ 1406 \ 1407 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1408 "The tolerance of the phase-change detector for on-the-fly" \ 1409 " PLAB resizing during a scavenge") \ 1410 \ 1411 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1412 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1413 " during a scavenge") \ 1414 \ 1415 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1416 "The clamping of the gain in the feedback loop for on-the-fly" \ 1417 " PLAB resizing during a scavenge") \ 1418 \ 1419 product(bool, AlwaysPreTouch, false, \ 1420 "It forces all freshly committed pages to be pre-touched.") \ 1421 \ 1422 product(bool, CMSUseOldDefaults, false, \ 1423 "A flag temporarily introduced to allow reverting to some " \ 1424 "older default settings; older as of 6.0") \ 1425 \ 1426 product(intx, CMSYoungGenPerWorker, 16*M, \ 1427 "The amount of young gen chosen by default per GC worker " \ 1428 "thread available") \ 1429 \ 1430 product(bool, GCOverheadReporting, false, \ 1431 "Enables the GC overhead reporting facility") \ 1432 \ 1433 product(intx, GCOverheadReportingPeriodMS, 100, \ 1434 "Reporting period for conc GC overhead reporting, in ms ") \ 1435 \ 1436 product(bool, CMSIncrementalMode, false, \ 1437 "Whether CMS GC should operate in \"incremental\" mode") \ 1438 \ 1439 product(uintx, CMSIncrementalDutyCycle, 10, \ 1440 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1441 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1442 "value") \ 1443 \ 1444 product(bool, CMSIncrementalPacing, true, \ 1445 "Whether the CMS incremental mode duty cycle should be " \ 1446 "automatically adjusted") \ 1447 \ 1448 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1449 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1450 "enabled (a percentage, 0-100)") \ 1451 \ 1452 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1453 "Percentage (0-100) used to add conservatism when computing the " \ 1454 "duty cycle") \ 1455 \ 1456 product(uintx, CMSIncrementalOffset, 0, \ 1457 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1458 " is shifted to the right within the period between young GCs") \ 1459 \ 1460 product(uintx, CMSExpAvgFactor, 50, \ 1461 "Percentage (0-100) used to weight the current sample when" \ 1462 "computing exponential averages for CMS statistics.") \ 1463 \ 1464 product(uintx, CMS_FLSWeight, 75, \ 1465 "Percentage (0-100) used to weight the current sample when" \ 1466 "computing exponentially decating averages for CMS FLS statistics.") \ 1467 \ 1468 product(uintx, CMS_FLSPadding, 1, \ 1469 "The multiple of deviation from mean to use for buffering" \ 1470 "against volatility in free list demand.") \ 1471 \ 1472 product(uintx, FLSCoalescePolicy, 2, \ 1473 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1474 \ 1475 product(bool, FLSAlwaysCoalesceLarge, false, \ 1476 "CMS: Larger free blocks are always available for coalescing") \ 1477 \ 1478 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1479 "CMS: the smaller the percentage the greater the coalition force")\ 1480 \ 1481 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1482 "CMS: the factor by which to inflate estimated demand of small" \ 1483 " block sizes to prevent coalescing with an adjoining block") \ 1484 \ 1485 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1486 "CMS: the factor by which to inflate estimated demand of large" \ 1487 " block sizes to prevent coalescing with an adjoining block") \ 1488 \ 1489 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1490 "CMS: the factor by which to inflate estimated demand of small" \ 1491 " block sizes to prevent splitting to supply demand for smaller" \ 1492 " blocks") \ 1493 \ 1494 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1495 "CMS: the factor by which to inflate estimated demand of large" \ 1496 " block sizes to prevent splitting to supply demand for smaller" \ 1497 " blocks") \ 1498 \ 1499 product(bool, CMSExtrapolateSweep, false, \ 1500 "CMS: cushion for block demand during sweep") \ 1501 \ 1502 product(uintx, CMS_SweepWeight, 75, \ 1503 "Percentage (0-100) used to weight the current sample when " \ 1504 "computing exponentially decaying average for inter-sweep " \ 1505 "duration") \ 1506 \ 1507 product(uintx, CMS_SweepPadding, 1, \ 1508 "The multiple of deviation from mean to use for buffering " \ 1509 "against volatility in inter-sweep duration.") \ 1510 \ 1511 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1512 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1513 "duration exceeds this threhold in milliseconds") \ 1514 \ 1515 develop(bool, CMSTraceIncrementalMode, false, \ 1516 "Trace CMS incremental mode") \ 1517 \ 1518 develop(bool, CMSTraceIncrementalPacing, false, \ 1519 "Trace CMS incremental mode pacing computation") \ 1520 \ 1521 develop(bool, CMSTraceThreadState, false, \ 1522 "Trace the CMS thread state (enable the trace_state() method)") \ 1523 \ 1524 product(bool, CMSClassUnloadingEnabled, false, \ 1525 "Whether class unloading enabled when using CMS GC") \ 1526 \ 1527 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1528 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1529 " for which classes may not be unloaded") \ 1530 \ 1531 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1532 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1533 \ 1534 product(bool, UseCMSCompactAtFullCollection, true, \ 1535 "Use mark sweep compact at full collections") \ 1536 \ 1537 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1538 "Number of CMS full collection done before compaction if > 0") \ 1539 \ 1540 develop(intx, CMSDictionaryChoice, 0, \ 1541 "Use BinaryTreeDictionary as default in the CMS generation") \ 1542 \ 1543 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1544 "Replenish an indexed free list with this number of chunks") \ 1545 \ 1546 product(bool, CMSReplenishIntermediate, true, \ 1547 "Replenish all intermediate free-list caches") \ 1548 \ 1549 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1550 "When satisfying batched demand, split blocks from the " \ 1551 "IndexedFreeList whose size is a multiple of requested size") \ 1552 \ 1553 product(bool, CMSLoopWarn, false, \ 1554 "Warn in case of excessive CMS looping") \ 1555 \ 1556 develop(bool, CMSOverflowEarlyRestoration, false, \ 1557 "Whether preserved marks should be restored early") \ 1558 \ 1559 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1560 "Size of marking stack") \ 1561 \ 1562 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1563 "Max size of marking stack") \ 1564 \ 1565 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1566 "Whether we should simulate frequent marking stack / work queue" \ 1567 " overflow") \ 1568 \ 1569 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1570 "An `interval' counter that determines how frequently" \ 1571 " we simulate overflow; a smaller number increases frequency") \ 1572 \ 1573 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1574 "(Temporary, subject to experimentation)" \ 1575 "Maximum number of abortable preclean iterations, if > 0") \ 1576 \ 1577 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1578 "(Temporary, subject to experimentation)" \ 1579 "Maximum time in abortable preclean in ms") \ 1580 \ 1581 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1582 "(Temporary, subject to experimentation)" \ 1583 "Nominal minimum work per abortable preclean iteration") \ 1584 \ 1585 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1586 "(Temporary, subject to experimentation)" \ 1587 " Time that we sleep between iterations when not given" \ 1588 " enough work per iteration") \ 1589 \ 1590 product(uintx, CMSRescanMultiple, 32, \ 1591 "Size (in cards) of CMS parallel rescan task") \ 1592 \ 1593 product(uintx, CMSConcMarkMultiple, 32, \ 1594 "Size (in cards) of CMS concurrent MT marking task") \ 1595 \ 1596 product(uintx, CMSRevisitStackSize, 1*M, \ 1597 "Size of CMS KlassKlass revisit stack") \ 1598 \ 1599 product(bool, CMSAbortSemantics, false, \ 1600 "Whether abort-on-overflow semantics is implemented") \ 1601 \ 1602 product(bool, CMSParallelRemarkEnabled, true, \ 1603 "Whether parallel remark enabled (only if ParNewGC)") \ 1604 \ 1605 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1606 "Whether parallel remark of survivor space" \ 1607 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1608 \ 1609 product(bool, CMSPLABRecordAlways, true, \ 1610 "Whether to always record survivor space PLAB bdries" \ 1611 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1612 \ 1613 product(bool, CMSConcurrentMTEnabled, true, \ 1614 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1615 \ 1616 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1617 "Whether concurrent precleaning enabled in perm gen" \ 1618 " (effective only when CMSPrecleaningEnabled is true)") \ 1619 \ 1620 product(bool, CMSPrecleaningEnabled, true, \ 1621 "Whether concurrent precleaning enabled") \ 1622 \ 1623 product(uintx, CMSPrecleanIter, 3, \ 1624 "Maximum number of precleaning iteration passes") \ 1625 \ 1626 product(uintx, CMSPrecleanNumerator, 2, \ 1627 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1628 " ratio") \ 1629 \ 1630 product(uintx, CMSPrecleanDenominator, 3, \ 1631 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1632 " ratio") \ 1633 \ 1634 product(bool, CMSPrecleanRefLists1, true, \ 1635 "Preclean ref lists during (initial) preclean phase") \ 1636 \ 1637 product(bool, CMSPrecleanRefLists2, false, \ 1638 "Preclean ref lists during abortable preclean phase") \ 1639 \ 1640 product(bool, CMSPrecleanSurvivors1, false, \ 1641 "Preclean survivors during (initial) preclean phase") \ 1642 \ 1643 product(bool, CMSPrecleanSurvivors2, true, \ 1644 "Preclean survivors during abortable preclean phase") \ 1645 \ 1646 product(uintx, CMSPrecleanThreshold, 1000, \ 1647 "Don't re-iterate if #dirty cards less than this") \ 1648 \ 1649 product(bool, CMSCleanOnEnter, true, \ 1650 "Clean-on-enter optimization for reducing number of dirty cards") \ 1651 \ 1652 product(uintx, CMSRemarkVerifyVariant, 1, \ 1653 "Choose variant (1,2) of verification following remark") \ 1654 \ 1655 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1656 "If Eden used is below this value, don't try to schedule remark") \ 1657 \ 1658 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1659 "The Eden occupancy % at which to try and schedule remark pause") \ 1660 \ 1661 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1662 "Start sampling Eden top at least before yg occupancy reaches" \ 1663 " 1/<ratio> of the size at which we plan to schedule remark") \ 1664 \ 1665 product(uintx, CMSSamplingGrain, 16*K, \ 1666 "The minimum distance between eden samples for CMS (see above)") \ 1667 \ 1668 product(bool, CMSScavengeBeforeRemark, false, \ 1669 "Attempt scavenge before the CMS remark step") \ 1670 \ 1671 develop(bool, CMSTraceSweeper, false, \ 1672 "Trace some actions of the CMS sweeper") \ 1673 \ 1674 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1675 "Don't drain below this size per parallel worker/thief") \ 1676 \ 1677 product(intx, CMSWaitDuration, 2000, \ 1678 "Time in milliseconds that CMS thread waits for young GC") \ 1679 \ 1680 product(bool, CMSYield, true, \ 1681 "Yield between steps of concurrent mark & sweep") \ 1682 \ 1683 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1684 "Bitmap operations should process at most this many bits" \ 1685 "between yields") \ 1686 \ 1687 product(bool, CMSDumpAtPromotionFailure, false, \ 1688 "Dump useful information about the state of the CMS old " \ 1689 " generation upon a promotion failure.") \ 1690 \ 1691 product(bool, CMSPrintChunksInDump, false, \ 1692 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1693 " more detailed information about the free chunks.") \ 1694 \ 1695 product(bool, CMSPrintObjectsInDump, false, \ 1696 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1697 " more detailed information about the allocated objects.") \ 1698 \ 1699 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1700 "Verify that all refs across the FLS boundary " \ 1701 " are to valid objects") \ 1702 \ 1703 diagnostic(bool, FLSVerifyLists, false, \ 1704 "Do lots of (expensive) FreeListSpace verification") \ 1705 \ 1706 diagnostic(bool, FLSVerifyIndexTable, false, \ 1707 "Do lots of (expensive) FLS index table verification") \ 1708 \ 1709 develop(bool, FLSVerifyDictionary, false, \ 1710 "Do lots of (expensive) FLS dictionary verification") \ 1711 \ 1712 develop(bool, VerifyBlockOffsetArray, false, \ 1713 "Do (expensive!) block offset array verification") \ 1714 \ 1715 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1716 "Maintain _unallocated_block in BlockOffsetArray" \ 1717 " (currently applicable only to CMS collector)") \ 1718 \ 1719 develop(bool, TraceCMSState, false, \ 1720 "Trace the state of the CMS collection") \ 1721 \ 1722 product(intx, RefDiscoveryPolicy, 0, \ 1723 "Whether reference-based(0) or referent-based(1)") \ 1724 \ 1725 product(bool, ParallelRefProcEnabled, false, \ 1726 "Enable parallel reference processing whenever possible") \ 1727 \ 1728 product(bool, ParallelRefProcBalancingEnabled, true, \ 1729 "Enable balancing of reference processing queues") \ 1730 \ 1731 product(intx, CMSTriggerRatio, 80, \ 1732 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1733 "allocated before a CMS collection cycle commences") \ 1734 \ 1735 product(intx, CMSTriggerPermRatio, 80, \ 1736 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1737 "is allocated before a CMS collection cycle commences, that " \ 1738 "also collects the perm generation") \ 1739 \ 1740 product(uintx, CMSBootstrapOccupancy, 50, \ 1741 "Percentage CMS generation occupancy at which to " \ 1742 "initiate CMS collection for bootstrapping collection stats") \ 1743 \ 1744 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1745 "Percentage CMS generation occupancy to start a CMS collection " \ 1746 "cycle. A negative value means that CMSTriggerRatio is used") \ 1747 \ 1748 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1749 "Percentage of the (entire) heap occupancy to start a " \ 1750 "concurrent GC cycle. It us used by GCs that trigger a " \ 1751 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1752 "not just one of the generations (e.g., G1). A value of 0 " \ 1753 "denotes 'do constant GC cycles'.") \ 1754 \ 1755 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1756 "Percentage CMS perm generation occupancy to start a " \ 1757 "CMScollection cycle. A negative value means that " \ 1758 "CMSTriggerPermRatio is used") \ 1759 \ 1760 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1761 "Only use occupancy as a crierion for starting a CMS collection") \ 1762 \ 1763 product(intx, CMSIsTooFullPercentage, 98, \ 1764 "An absolute ceiling above which CMS will always consider the " \ 1765 "perm gen ripe for collection") \ 1766 \ 1767 develop(bool, CMSTestInFreeList, false, \ 1768 "Check if the coalesced range is already in the " \ 1769 "free lists as claimed") \ 1770 \ 1771 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1772 "Check that all the garbage collected was returned to the " \ 1773 "free lists.") \ 1774 \ 1775 notproduct(bool, ScavengeALot, false, \ 1776 "Force scavenge at every Nth exit from the runtime system " \ 1777 "(N=ScavengeALotInterval)") \ 1778 \ 1779 develop(bool, FullGCALot, false, \ 1780 "Force full gc at every Nth exit from the runtime system " \ 1781 "(N=FullGCALotInterval)") \ 1782 \ 1783 notproduct(bool, GCALotAtAllSafepoints, false, \ 1784 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1785 \ 1786 product(bool, HandlePromotionFailure, true, \ 1787 "The youngest generation collection does not require " \ 1788 "a guarantee of full promotion of all live objects.") \ 1789 \ 1790 product(bool, PrintPromotionFailure, false, \ 1791 "Print additional diagnostic information following " \ 1792 " promotion failure") \ 1793 \ 1794 notproduct(bool, PromotionFailureALot, false, \ 1795 "Use promotion failure handling on every youngest generation " \ 1796 "collection") \ 1797 \ 1798 develop(uintx, PromotionFailureALotCount, 1000, \ 1799 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1800 "refill attempts (ParNew) or promotion attempts " \ 1801 "(other young collectors) ") \ 1802 \ 1803 develop(uintx, PromotionFailureALotInterval, 5, \ 1804 "Total collections between promotion failures alot") \ 1805 \ 1806 develop(intx, WorkStealingSleepMillis, 1, \ 1807 "Sleep time when sleep is used for yields") \ 1808 \ 1809 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1810 "Number of yields before a sleep is done during workstealing") \ 1811 \ 1812 develop(uintx, WorkStealingHardSpins, 4096, \ 1813 "Number of iterations in a spin loop between checks on " \ 1814 "time out of hard spin") \ 1815 \ 1816 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1817 "Ratio of hard spins to calls to yield") \ 1818 \ 1819 product(uintx, PreserveMarkStackSize, 1024, \ 1820 "Size for stack used in promotion failure handling") \ 1821 \ 1822 develop(uintx, ObjArrayMarkingStride, 512, \ 1823 "Number of ObjArray elements to push onto the marking stack" \ 1824 "before pushing a continuation entry") \ 1825 \ 1826 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1827 \ 1828 product_pd(bool, ResizeTLAB, \ 1829 "Dynamically resize tlab size for threads") \ 1830 \ 1831 product(bool, ZeroTLAB, false, \ 1832 "Zero out the newly created TLAB") \ 1833 \ 1834 product(bool, FastTLABRefill, true, \ 1835 "Use fast TLAB refill code") \ 1836 \ 1837 product(bool, PrintTLAB, false, \ 1838 "Print various TLAB related information") \ 1839 \ 1840 product(bool, TLABStats, true, \ 1841 "Print various TLAB related information") \ 1842 \ 1843 product(bool, PrintRevisitStats, false, \ 1844 "Print revisit (klass and MDO) stack related information") \ 1845 \ 1846 product_pd(bool, NeverActAsServerClassMachine, \ 1847 "Never act like a server-class machine") \ 1848 \ 1849 product(bool, AlwaysActAsServerClassMachine, false, \ 1850 "Always act like a server-class machine") \ 1851 \ 1852 product_pd(uint64_t, MaxRAM, \ 1853 "Real memory size (in bytes) used to set maximum heap size") \ 1854 \ 1855 product(uintx, ErgoHeapSizeLimit, 0, \ 1856 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1857 "MaxRAM / MaxRAMFraction") \ 1858 \ 1859 product(uintx, MaxRAMFraction, 4, \ 1860 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1861 "size") \ 1862 \ 1863 product(uintx, DefaultMaxRAMFraction, 4, \ 1864 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1865 "size; deprecated: to be renamed to MaxRAMFraction") \ 1866 \ 1867 product(uintx, MinRAMFraction, 2, \ 1868 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1869 "size on systems with small physical memory size") \ 1870 \ 1871 product(uintx, InitialRAMFraction, 64, \ 1872 "Fraction (1/n) of real memory used for initial heap size") \ 1873 \ 1874 product(bool, UseAutoGCSelectPolicy, false, \ 1875 "Use automatic collection selection policy") \ 1876 \ 1877 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1878 "Automatic GC selection pause threshhold in ms") \ 1879 \ 1880 product(bool, UseAdaptiveSizePolicy, true, \ 1881 "Use adaptive generation sizing policies") \ 1882 \ 1883 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1884 "Use adaptive survivor sizing policies") \ 1885 \ 1886 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1887 "Use adaptive young-old sizing policies at minor collections") \ 1888 \ 1889 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1890 "Use adaptive young-old sizing policies at major collections") \ 1891 \ 1892 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1893 "Use statistics from System.GC for adaptive size policy") \ 1894 \ 1895 product(bool, UseAdaptiveGCBoundary, false, \ 1896 "Allow young-old boundary to move") \ 1897 \ 1898 develop(bool, TraceAdaptiveGCBoundary, false, \ 1899 "Trace young-old boundary moves") \ 1900 \ 1901 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1902 "Resize the virtual spaces of the young or old generations") \ 1903 \ 1904 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1905 "Policy for changeing generation size for throughput goals") \ 1906 \ 1907 product(uintx, AdaptiveSizePausePolicy, 0, \ 1908 "Policy for changing generation size for pause goals") \ 1909 \ 1910 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1911 "Adjust tenured generation to achive a minor pause goal") \ 1912 \ 1913 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1914 "Adjust young generation to achive a major pause goal") \ 1915 \ 1916 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1917 "Number of steps where heuristics is used before data is used") \ 1918 \ 1919 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1920 "Number of collections before the adaptive sizing is started") \ 1921 \ 1922 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1923 "Collecton interval for printing information; zero => never") \ 1924 \ 1925 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1926 "Use adaptive minimum footprint as a goal") \ 1927 \ 1928 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1929 "Weight given to exponential resizing, between 0 and 100") \ 1930 \ 1931 product(uintx, AdaptiveTimeWeight, 25, \ 1932 "Weight given to time in adaptive policy, between 0 and 100") \ 1933 \ 1934 product(uintx, PausePadding, 1, \ 1935 "How much buffer to keep for pause time") \ 1936 \ 1937 product(uintx, PromotedPadding, 3, \ 1938 "How much buffer to keep for promotion failure") \ 1939 \ 1940 product(uintx, SurvivorPadding, 3, \ 1941 "How much buffer to keep for survivor overflow") \ 1942 \ 1943 product(uintx, AdaptivePermSizeWeight, 20, \ 1944 "Weight for perm gen exponential resizing, between 0 and 100") \ 1945 \ 1946 product(uintx, PermGenPadding, 3, \ 1947 "How much buffer to keep for perm gen sizing") \ 1948 \ 1949 product(uintx, ThresholdTolerance, 10, \ 1950 "Allowed collection cost difference between generations") \ 1951 \ 1952 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1953 "If collection costs are within margin, reduce both by full " \ 1954 "delta") \ 1955 \ 1956 product(uintx, YoungGenerationSizeIncrement, 20, \ 1957 "Adaptive size percentage change in young generation") \ 1958 \ 1959 product(uintx, YoungGenerationSizeSupplement, 80, \ 1960 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1961 \ 1962 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1963 "Decay factor to YoungedGenerationSizeSupplement") \ 1964 \ 1965 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1966 "Adaptive size percentage change in tenured generation") \ 1967 \ 1968 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1969 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1970 \ 1971 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1972 "Decay factor to TenuredGenerationSizeIncrement") \ 1973 \ 1974 product(uintx, MaxGCPauseMillis, max_uintx, \ 1975 "Adaptive size policy maximum GC pause time goal in msec, " \ 1976 "or (G1 Only) the max. GC time per MMU time slice") \ 1977 \ 1978 product(uintx, GCPauseIntervalMillis, 0, \ 1979 "Time slice for MMU specification") \ 1980 \ 1981 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1982 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1983 \ 1984 product(uintx, GCTimeRatio, 99, \ 1985 "Adaptive size policy application time to GC time ratio") \ 1986 \ 1987 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1988 "Adaptive size scale down factor for shrinking") \ 1989 \ 1990 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1991 "Adaptive size decays the major cost for long major intervals") \ 1992 \ 1993 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1994 "Time scale over which major costs decay") \ 1995 \ 1996 product(uintx, MinSurvivorRatio, 3, \ 1997 "Minimum ratio of young generation/survivor space size") \ 1998 \ 1999 product(uintx, InitialSurvivorRatio, 8, \ 2000 "Initial ratio of eden/survivor space size") \ 2001 \ 2002 product(uintx, BaseFootPrintEstimate, 256*M, \ 2003 "Estimate of footprint other than Java Heap") \ 2004 \ 2005 product(bool, UseGCOverheadLimit, true, \ 2006 "Use policy to limit of proportion of time spent in GC " \ 2007 "before an OutOfMemory error is thrown") \ 2008 \ 2009 product(uintx, GCTimeLimit, 98, \ 2010 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2011 "error is thrown (used with GCHeapFreeLimit)") \ 2012 \ 2013 product(uintx, GCHeapFreeLimit, 2, \ 2014 "Minimum percentage of free space after a full GC before an " \ 2015 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2016 \ 2017 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2018 "Number of consecutive collections before gc time limit fires") \ 2019 \ 2020 product(bool, PrintAdaptiveSizePolicy, false, \ 2021 "Print information about AdaptiveSizePolicy") \ 2022 \ 2023 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2024 "How far ahead to prefetch destination area (<= 0 means off)") \ 2025 \ 2026 product(intx, PrefetchScanIntervalInBytes, -1, \ 2027 "How far ahead to prefetch scan area (<= 0 means off)") \ 2028 \ 2029 product(intx, PrefetchFieldsAhead, -1, \ 2030 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2031 \ 2032 develop(bool, UsePrefetchQueue, true, \ 2033 "Use the prefetch queue during PS promotion") \ 2034 \ 2035 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2036 "Verify system before exiting") \ 2037 \ 2038 diagnostic(bool, VerifyBeforeGC, false, \ 2039 "Verify memory system before GC") \ 2040 \ 2041 diagnostic(bool, VerifyAfterGC, false, \ 2042 "Verify memory system after GC") \ 2043 \ 2044 diagnostic(bool, VerifyDuringGC, false, \ 2045 "Verify memory system during GC (between phases)") \ 2046 \ 2047 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2048 "Enable parallel memory system verification") \ 2049 \ 2050 diagnostic(bool, DeferInitialCardMark, false, \ 2051 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2052 "may arise from new_pre_store_barrier") \ 2053 \ 2054 diagnostic(bool, VerifyRememberedSets, false, \ 2055 "Verify GC remembered sets") \ 2056 \ 2057 diagnostic(bool, VerifyObjectStartArray, true, \ 2058 "Verify GC object start array if verify before/after") \ 2059 \ 2060 product(bool, DisableExplicitGC, false, \ 2061 "Tells whether calling System.gc() does a full GC") \ 2062 \ 2063 notproduct(bool, CheckMemoryInitialization, false, \ 2064 "Checks memory initialization") \ 2065 \ 2066 product(bool, CollectGen0First, false, \ 2067 "Collect youngest generation before each full GC") \ 2068 \ 2069 diagnostic(bool, BindCMSThreadToCPU, false, \ 2070 "Bind CMS Thread to CPU if possible") \ 2071 \ 2072 diagnostic(uintx, CPUForCMSThread, 0, \ 2073 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2074 \ 2075 product(bool, BindGCTaskThreadsToCPUs, false, \ 2076 "Bind GCTaskThreads to CPUs if possible") \ 2077 \ 2078 product(bool, UseGCTaskAffinity, false, \ 2079 "Use worker affinity when asking for GCTasks") \ 2080 \ 2081 product(uintx, ProcessDistributionStride, 4, \ 2082 "Stride through processors when distributing processes") \ 2083 \ 2084 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2085 "number of times the coordinator GC thread will sleep while " \ 2086 "yielding before giving up and resuming GC") \ 2087 \ 2088 product(uintx, CMSYieldSleepCount, 0, \ 2089 "number of times a GC thread (minus the coordinator) " \ 2090 "will sleep while yielding before giving up and resuming GC") \ 2091 \ 2092 /* gc tracing */ \ 2093 manageable(bool, PrintGC, false, \ 2094 "Print message at garbage collect") \ 2095 \ 2096 manageable(bool, PrintGCDetails, false, \ 2097 "Print more details at garbage collect") \ 2098 \ 2099 manageable(bool, PrintGCDateStamps, false, \ 2100 "Print date stamps at garbage collect") \ 2101 \ 2102 manageable(bool, PrintGCTimeStamps, false, \ 2103 "Print timestamps at garbage collect") \ 2104 \ 2105 product(bool, PrintGCTaskTimeStamps, false, \ 2106 "Print timestamps for individual gc worker thread tasks") \ 2107 \ 2108 develop(intx, ConcGCYieldTimeout, 0, \ 2109 "If non-zero, assert that GC threads yield within this # of ms.") \ 2110 \ 2111 notproduct(bool, TraceMarkSweep, false, \ 2112 "Trace mark sweep") \ 2113 \ 2114 product(bool, PrintReferenceGC, false, \ 2115 "Print times spent handling reference objects during GC " \ 2116 " (enabled only when PrintGCDetails)") \ 2117 \ 2118 develop(bool, TraceReferenceGC, false, \ 2119 "Trace handling of soft/weak/final/phantom references") \ 2120 \ 2121 develop(bool, TraceFinalizerRegistration, false, \ 2122 "Trace registration of final references") \ 2123 \ 2124 notproduct(bool, TraceScavenge, false, \ 2125 "Trace scavenge") \ 2126 \ 2127 product_rw(bool, TraceClassLoading, false, \ 2128 "Trace all classes loaded") \ 2129 \ 2130 product(bool, TraceClassLoadingPreorder, false, \ 2131 "Trace all classes loaded in order referenced (not loaded)") \ 2132 \ 2133 product_rw(bool, TraceClassUnloading, false, \ 2134 "Trace unloading of classes") \ 2135 \ 2136 product_rw(bool, TraceLoaderConstraints, false, \ 2137 "Trace loader constraints") \ 2138 \ 2139 product(bool, TraceGen0Time, false, \ 2140 "Trace accumulated time for Gen 0 collection") \ 2141 \ 2142 product(bool, TraceGen1Time, false, \ 2143 "Trace accumulated time for Gen 1 collection") \ 2144 \ 2145 product(bool, PrintTenuringDistribution, false, \ 2146 "Print tenuring age information") \ 2147 \ 2148 product_rw(bool, PrintHeapAtGC, false, \ 2149 "Print heap layout before and after each GC") \ 2150 \ 2151 product_rw(bool, PrintHeapAtGCExtended, false, \ 2152 "Prints extended information about the layout of the heap " \ 2153 "when -XX:+PrintHeapAtGC is set") \ 2154 \ 2155 product(bool, PrintHeapAtSIGBREAK, true, \ 2156 "Print heap layout in response to SIGBREAK") \ 2157 \ 2158 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2159 "Print a class histogram before any major stop-world GC") \ 2160 \ 2161 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2162 "Print a class histogram after any major stop-world GC") \ 2163 \ 2164 manageable(bool, PrintClassHistogram, false, \ 2165 "Print a histogram of class instances") \ 2166 \ 2167 develop(bool, TraceWorkGang, false, \ 2168 "Trace activities of work gangs") \ 2169 \ 2170 product(bool, TraceParallelOldGCTasks, false, \ 2171 "Trace multithreaded GC activity") \ 2172 \ 2173 develop(bool, TraceBlockOffsetTable, false, \ 2174 "Print BlockOffsetTable maps") \ 2175 \ 2176 develop(bool, TraceCardTableModRefBS, false, \ 2177 "Print CardTableModRefBS maps") \ 2178 \ 2179 develop(bool, TraceGCTaskManager, false, \ 2180 "Trace actions of the GC task manager") \ 2181 \ 2182 develop(bool, TraceGCTaskQueue, false, \ 2183 "Trace actions of the GC task queues") \ 2184 \ 2185 develop(bool, TraceGCTaskThread, false, \ 2186 "Trace actions of the GC task threads") \ 2187 \ 2188 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2189 "Print the time taken by each parallel old gc phase." \ 2190 "PrintGCDetails must also be enabled.") \ 2191 \ 2192 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2193 "Trace parallel old gc marking phase") \ 2194 \ 2195 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2196 "Trace parallel old gc summary phase") \ 2197 \ 2198 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2199 "Trace parallel old gc compaction phase") \ 2200 \ 2201 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2202 "Trace parallel old gc dense prefix computation") \ 2203 \ 2204 develop(bool, IgnoreLibthreadGPFault, false, \ 2205 "Suppress workaround for libthread GP fault") \ 2206 \ 2207 product(bool, PrintJNIGCStalls, false, \ 2208 "Print diagnostic message when GC is stalled" \ 2209 "by JNI critical section") \ 2210 \ 2211 /* JVMTI heap profiling */ \ 2212 \ 2213 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2214 "Trace JVMTI object tagging calls") \ 2215 \ 2216 diagnostic(bool, VerifyBeforeIteration, false, \ 2217 "Verify memory system before JVMTI iteration") \ 2218 \ 2219 /* compiler interface */ \ 2220 \ 2221 develop(bool, CIPrintCompilerName, false, \ 2222 "when CIPrint is active, print the name of the active compiler") \ 2223 \ 2224 develop(bool, CIPrintCompileQueue, false, \ 2225 "display the contents of the compile queue whenever a " \ 2226 "compilation is enqueued") \ 2227 \ 2228 develop(bool, CIPrintRequests, false, \ 2229 "display every request for compilation") \ 2230 \ 2231 product(bool, CITime, false, \ 2232 "collect timing information for compilation") \ 2233 \ 2234 develop(bool, CITimeEach, false, \ 2235 "display timing information after each successful compilation") \ 2236 \ 2237 develop(bool, CICountOSR, true, \ 2238 "use a separate counter when assigning ids to osr compilations") \ 2239 \ 2240 develop(bool, CICompileNatives, true, \ 2241 "compile native methods if supported by the compiler") \ 2242 \ 2243 develop_pd(bool, CICompileOSR, \ 2244 "compile on stack replacement methods if supported by the " \ 2245 "compiler") \ 2246 \ 2247 develop(bool, CIPrintMethodCodes, false, \ 2248 "print method bytecodes of the compiled code") \ 2249 \ 2250 develop(bool, CIPrintTypeFlow, false, \ 2251 "print the results of ciTypeFlow analysis") \ 2252 \ 2253 develop(bool, CITraceTypeFlow, false, \ 2254 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2255 \ 2256 develop(intx, CICloneLoopTestLimit, 100, \ 2257 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2258 \ 2259 /* temp diagnostics */ \ 2260 \ 2261 diagnostic(bool, TraceRedundantCompiles, false, \ 2262 "Have compile broker print when a request already in the queue is"\ 2263 " requested again") \ 2264 \ 2265 diagnostic(bool, InitialCompileFast, false, \ 2266 "Initial compile at CompLevel_fast_compile") \ 2267 \ 2268 diagnostic(bool, InitialCompileReallyFast, false, \ 2269 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2270 \ 2271 diagnostic(bool, FullProfileOnReInterpret, true, \ 2272 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2273 \ 2274 /* compiler */ \ 2275 \ 2276 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2277 "Number of compiler threads to run") \ 2278 \ 2279 product(intx, CompilationPolicyChoice, 0, \ 2280 "which compilation policy (0/1)") \ 2281 \ 2282 develop(bool, UseStackBanging, true, \ 2283 "use stack banging for stack overflow checks (required for " \ 2284 "proper StackOverflow handling; disable only to measure cost " \ 2285 "of stackbanging)") \ 2286 \ 2287 develop(bool, Use24BitFPMode, true, \ 2288 "Set 24-bit FPU mode on a per-compile basis ") \ 2289 \ 2290 develop(bool, Use24BitFP, true, \ 2291 "use FP instructions that produce 24-bit precise results") \ 2292 \ 2293 develop(bool, UseStrictFP, true, \ 2294 "use strict fp if modifier strictfp is set") \ 2295 \ 2296 develop(bool, GenerateSynchronizationCode, true, \ 2297 "generate locking/unlocking code for synchronized methods and " \ 2298 "monitors") \ 2299 \ 2300 develop(bool, GenerateCompilerNullChecks, true, \ 2301 "Generate explicit null checks for loads/stores/calls") \ 2302 \ 2303 develop(bool, GenerateRangeChecks, true, \ 2304 "Generate range checks for array accesses") \ 2305 \ 2306 develop_pd(bool, ImplicitNullChecks, \ 2307 "generate code for implicit null checks") \ 2308 \ 2309 product(bool, PrintSafepointStatistics, false, \ 2310 "print statistics about safepoint synchronization") \ 2311 \ 2312 product(intx, PrintSafepointStatisticsCount, 300, \ 2313 "total number of safepoint statistics collected " \ 2314 "before printing them out") \ 2315 \ 2316 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2317 "print safepoint statistics only when safepoint takes" \ 2318 " more than PrintSafepointSatisticsTimeout in millis") \ 2319 \ 2320 product(bool, TraceSafepointCleanupTime, false, \ 2321 "print the break down of clean up tasks performed during" \ 2322 " safepoint") \ 2323 \ 2324 develop(bool, InlineAccessors, true, \ 2325 "inline accessor methods (get/set)") \ 2326 \ 2327 product(bool, Inline, true, \ 2328 "enable inlining") \ 2329 \ 2330 product(bool, ClipInlining, true, \ 2331 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2332 \ 2333 develop(bool, UseCHA, true, \ 2334 "enable CHA") \ 2335 \ 2336 product(bool, UseTypeProfile, true, \ 2337 "Check interpreter profile for historically monomorphic calls") \ 2338 \ 2339 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2340 "% of major receiver type to all profiled receivers") \ 2341 \ 2342 notproduct(bool, TimeCompiler, false, \ 2343 "time the compiler") \ 2344 \ 2345 notproduct(bool, TimeCompiler2, false, \ 2346 "detailed time the compiler (requires +TimeCompiler)") \ 2347 \ 2348 diagnostic(bool, PrintInlining, false, \ 2349 "prints inlining optimizations") \ 2350 \ 2351 diagnostic(bool, PrintIntrinsics, false, \ 2352 "prints attempted and successful inlining of intrinsics") \ 2353 \ 2354 product(bool, UseCountLeadingZerosInstruction, false, \ 2355 "Use count leading zeros instruction") \ 2356 \ 2357 product(bool, UsePopCountInstruction, false, \ 2358 "Use population count instruction") \ 2359 \ 2360 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2361 "do not expand intrinsics whose (internal) names appear here") \ 2362 \ 2363 develop(bool, StressReflectiveCode, false, \ 2364 "Use inexact types at allocations, etc., to test reflection") \ 2365 \ 2366 develop(bool, EagerInitialization, false, \ 2367 "Eagerly initialize classes if possible") \ 2368 \ 2369 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2370 "Update methodDataOops in Tier1-generated code") \ 2371 \ 2372 develop(bool, TraceMethodReplacement, false, \ 2373 "Print when methods are replaced do to recompilation") \ 2374 \ 2375 develop(bool, PrintMethodFlushing, false, \ 2376 "print the nmethods being flushed") \ 2377 \ 2378 notproduct(bool, LogMultipleMutexLocking, false, \ 2379 "log locking and unlocking of mutexes (only if multiple locks " \ 2380 "are held)") \ 2381 \ 2382 develop(bool, UseRelocIndex, false, \ 2383 "use an index to speed random access to relocations") \ 2384 \ 2385 develop(bool, StressCodeBuffers, false, \ 2386 "Exercise code buffer expansion and other rare state changes") \ 2387 \ 2388 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2389 "Generate extra debugging info for non-safepoints in nmethods") \ 2390 \ 2391 diagnostic(bool, DebugInlinedCalls, true, \ 2392 "If false, restricts profiled locations to the root method only") \ 2393 \ 2394 product(bool, PrintVMOptions, trueInDebug, \ 2395 "Print flags that appeared on the command line") \ 2396 \ 2397 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2398 "Ignore unrecognized VM options") \ 2399 \ 2400 product(bool, PrintCommandLineFlags, false, \ 2401 "Print flags specified on command line or set by ergonomics") \ 2402 \ 2403 product(bool, PrintFlagsInitial, false, \ 2404 "Print all VM flags before argument processing and exit VM") \ 2405 \ 2406 product(bool, PrintFlagsFinal, false, \ 2407 "Print all VM flags after argument and ergonomic processing") \ 2408 \ 2409 diagnostic(bool, SerializeVMOutput, true, \ 2410 "Use a mutex to serialize output to tty and hotspot.log") \ 2411 \ 2412 diagnostic(bool, DisplayVMOutput, true, \ 2413 "Display all VM output on the tty, independently of LogVMOutput") \ 2414 \ 2415 diagnostic(bool, LogVMOutput, trueInDebug, \ 2416 "Save VM output to hotspot.log, or to LogFile") \ 2417 \ 2418 diagnostic(ccstr, LogFile, NULL, \ 2419 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2420 \ 2421 product(ccstr, ErrorFile, NULL, \ 2422 "If an error occurs, save the error data to this file " \ 2423 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2424 \ 2425 product(bool, DisplayVMOutputToStderr, false, \ 2426 "If DisplayVMOutput is true, display all VM output to stderr") \ 2427 \ 2428 product(bool, DisplayVMOutputToStdout, false, \ 2429 "If DisplayVMOutput is true, display all VM output to stdout") \ 2430 \ 2431 product(bool, UseHeavyMonitors, false, \ 2432 "use heavyweight instead of lightweight Java monitors") \ 2433 \ 2434 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2435 "print histogram of the symbol table") \ 2436 \ 2437 notproduct(bool, ExitVMOnVerifyError, false, \ 2438 "standard exit from VM if bytecode verify error " \ 2439 "(only in debug mode)") \ 2440 \ 2441 notproduct(ccstr, AbortVMOnException, NULL, \ 2442 "Call fatal if this exception is thrown. Example: " \ 2443 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2444 \ 2445 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2446 "Call fatal if the exception pointed by AbortVMOnException " \ 2447 "has this message.") \ 2448 \ 2449 develop(bool, DebugVtables, false, \ 2450 "add debugging code to vtable dispatch") \ 2451 \ 2452 develop(bool, PrintVtables, false, \ 2453 "print vtables when printing klass") \ 2454 \ 2455 notproduct(bool, PrintVtableStats, false, \ 2456 "print vtables stats at end of run") \ 2457 \ 2458 develop(bool, TraceCreateZombies, false, \ 2459 "trace creation of zombie nmethods") \ 2460 \ 2461 notproduct(bool, IgnoreLockingAssertions, false, \ 2462 "disable locking assertions (for speed)") \ 2463 \ 2464 notproduct(bool, VerifyLoopOptimizations, false, \ 2465 "verify major loop optimizations") \ 2466 \ 2467 product(bool, RangeCheckElimination, true, \ 2468 "Split loop iterations to eliminate range checks") \ 2469 \ 2470 develop_pd(bool, UncommonNullCast, \ 2471 "track occurrences of null in casts; adjust compiler tactics") \ 2472 \ 2473 develop(bool, TypeProfileCasts, true, \ 2474 "treat casts like calls for purposes of type profiling") \ 2475 \ 2476 develop(bool, MonomorphicArrayCheck, true, \ 2477 "Uncommon-trap array store checks that require full type check") \ 2478 \ 2479 diagnostic(bool, ProfileDynamicTypes, true, \ 2480 "do extra type profiling and use it more aggressively") \ 2481 \ 2482 develop(bool, DelayCompilationDuringStartup, true, \ 2483 "Delay invoking the compiler until main application class is " \ 2484 "loaded") \ 2485 \ 2486 develop(bool, CompileTheWorld, false, \ 2487 "Compile all methods in all classes in bootstrap class path " \ 2488 "(stress test)") \ 2489 \ 2490 develop(bool, CompileTheWorldPreloadClasses, true, \ 2491 "Preload all classes used by a class before start loading") \ 2492 \ 2493 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2494 "Compile all methods although class initializer failed") \ 2495 \ 2496 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2497 "Force a safepoint every n compiles so sweeper can keep up") \ 2498 \ 2499 develop(bool, TraceIterativeGVN, false, \ 2500 "Print progress during Iterative Global Value Numbering") \ 2501 \ 2502 develop(bool, FillDelaySlots, true, \ 2503 "Fill delay slots (on SPARC only)") \ 2504 \ 2505 develop(bool, VerifyIterativeGVN, false, \ 2506 "Verify Def-Use modifications during sparse Iterative Global " \ 2507 "Value Numbering") \ 2508 \ 2509 notproduct(bool, TracePhaseCCP, false, \ 2510 "Print progress during Conditional Constant Propagation") \ 2511 \ 2512 develop(bool, TimeLivenessAnalysis, false, \ 2513 "Time computation of bytecode liveness analysis") \ 2514 \ 2515 develop(bool, TraceLivenessGen, false, \ 2516 "Trace the generation of liveness analysis information") \ 2517 \ 2518 notproduct(bool, TraceLivenessQuery, false, \ 2519 "Trace queries of liveness analysis information") \ 2520 \ 2521 notproduct(bool, CollectIndexSetStatistics, false, \ 2522 "Collect information about IndexSets") \ 2523 \ 2524 develop(bool, PrintDominators, false, \ 2525 "Print out dominator trees for GVN") \ 2526 \ 2527 develop(bool, UseLoopSafepoints, true, \ 2528 "Generate Safepoint nodes in every loop") \ 2529 \ 2530 notproduct(bool, TraceCISCSpill, false, \ 2531 "Trace allocators use of cisc spillable instructions") \ 2532 \ 2533 notproduct(bool, TraceSpilling, false, \ 2534 "Trace spilling") \ 2535 \ 2536 product(bool, SplitIfBlocks, true, \ 2537 "Clone compares and control flow through merge points to fold " \ 2538 "some branches") \ 2539 \ 2540 develop(intx, FastAllocateSizeLimit, 128*K, \ 2541 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2542 "Inline allocations larger than this in doublewords must go slow")\ 2543 \ 2544 product(bool, AggressiveOpts, false, \ 2545 "Enable aggressive optimizations - see arguments.cpp") \ 2546 \ 2547 product(bool, UseStringCache, false, \ 2548 "Enable String cache capabilities on String.java") \ 2549 \ 2550 /* statistics */ \ 2551 develop(bool, CountCompiledCalls, false, \ 2552 "counts method invocations") \ 2553 \ 2554 notproduct(bool, CountRuntimeCalls, false, \ 2555 "counts VM runtime calls") \ 2556 \ 2557 develop(bool, CountJNICalls, false, \ 2558 "counts jni method invocations") \ 2559 \ 2560 notproduct(bool, CountJVMCalls, false, \ 2561 "counts jvm method invocations") \ 2562 \ 2563 notproduct(bool, CountRemovableExceptions, false, \ 2564 "count exceptions that could be replaced by branches due to " \ 2565 "inlining") \ 2566 \ 2567 notproduct(bool, ICMissHistogram, false, \ 2568 "produce histogram of IC misses") \ 2569 \ 2570 notproduct(bool, PrintClassStatistics, false, \ 2571 "prints class statistics at end of run") \ 2572 \ 2573 notproduct(bool, PrintMethodStatistics, false, \ 2574 "prints method statistics at end of run") \ 2575 \ 2576 /* interpreter */ \ 2577 develop(bool, ClearInterpreterLocals, false, \ 2578 "Always clear local variables of interpreter activations upon " \ 2579 "entry") \ 2580 \ 2581 product_pd(bool, RewriteBytecodes, \ 2582 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2583 \ 2584 product_pd(bool, RewriteFrequentPairs, \ 2585 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2586 \ 2587 diagnostic(bool, PrintInterpreter, false, \ 2588 "Prints the generated interpreter code") \ 2589 \ 2590 product(bool, UseInterpreter, true, \ 2591 "Use interpreter for non-compiled methods") \ 2592 \ 2593 develop(bool, UseFastSignatureHandlers, true, \ 2594 "Use fast signature handlers for native calls") \ 2595 \ 2596 develop(bool, UseV8InstrsOnly, false, \ 2597 "Use SPARC-V8 Compliant instruction subset") \ 2598 \ 2599 product(bool, UseNiagaraInstrs, false, \ 2600 "Use Niagara-efficient instruction subset") \ 2601 \ 2602 develop(bool, UseCASForSwap, false, \ 2603 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2604 \ 2605 product(bool, UseLoopCounter, true, \ 2606 "Increment invocation counter on backward branch") \ 2607 \ 2608 product(bool, UseFastEmptyMethods, true, \ 2609 "Use fast method entry code for empty methods") \ 2610 \ 2611 product(bool, UseFastAccessorMethods, true, \ 2612 "Use fast method entry code for accessor methods") \ 2613 \ 2614 product_pd(bool, UseOnStackReplacement, \ 2615 "Use on stack replacement, calls runtime if invoc. counter " \ 2616 "overflows in loop") \ 2617 \ 2618 notproduct(bool, TraceOnStackReplacement, false, \ 2619 "Trace on stack replacement") \ 2620 \ 2621 develop(bool, PoisonOSREntry, true, \ 2622 "Detect abnormal calls to OSR code") \ 2623 \ 2624 product_pd(bool, PreferInterpreterNativeStubs, \ 2625 "Use always interpreter stubs for native methods invoked via " \ 2626 "interpreter") \ 2627 \ 2628 develop(bool, CountBytecodes, false, \ 2629 "Count number of bytecodes executed") \ 2630 \ 2631 develop(bool, PrintBytecodeHistogram, false, \ 2632 "Print histogram of the executed bytecodes") \ 2633 \ 2634 develop(bool, PrintBytecodePairHistogram, false, \ 2635 "Print histogram of the executed bytecode pairs") \ 2636 \ 2637 diagnostic(bool, PrintSignatureHandlers, false, \ 2638 "Print code generated for native method signature handlers") \ 2639 \ 2640 develop(bool, VerifyOops, false, \ 2641 "Do plausibility checks for oops") \ 2642 \ 2643 develop(bool, CheckUnhandledOops, false, \ 2644 "Check for unhandled oops in VM code") \ 2645 \ 2646 develop(bool, VerifyJNIFields, trueInDebug, \ 2647 "Verify jfieldIDs for instance fields") \ 2648 \ 2649 notproduct(bool, VerifyJNIEnvThread, false, \ 2650 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2651 "from JNI") \ 2652 \ 2653 develop(bool, VerifyFPU, false, \ 2654 "Verify FPU state (check for NaN's, etc.)") \ 2655 \ 2656 develop(bool, VerifyThread, false, \ 2657 "Watch the thread register for corruption (SPARC only)") \ 2658 \ 2659 develop(bool, VerifyActivationFrameSize, false, \ 2660 "Verify that activation frame didn't become smaller than its " \ 2661 "minimal size") \ 2662 \ 2663 develop(bool, TraceFrequencyInlining, false, \ 2664 "Trace frequency based inlining") \ 2665 \ 2666 notproduct(bool, TraceTypeProfile, false, \ 2667 "Trace type profile") \ 2668 \ 2669 develop_pd(bool, InlineIntrinsics, \ 2670 "Inline intrinsics that can be statically resolved") \ 2671 \ 2672 product_pd(bool, ProfileInterpreter, \ 2673 "Profile at the bytecode level during interpretation") \ 2674 \ 2675 develop_pd(bool, ProfileTraps, \ 2676 "Profile deoptimization traps at the bytecode level") \ 2677 \ 2678 product(intx, ProfileMaturityPercentage, 20, \ 2679 "number of method invocations/branches (expressed as % of " \ 2680 "CompileThreshold) before using the method's profile") \ 2681 \ 2682 develop(bool, PrintMethodData, false, \ 2683 "Print the results of +ProfileInterpreter at end of run") \ 2684 \ 2685 develop(bool, VerifyDataPointer, trueInDebug, \ 2686 "Verify the method data pointer during interpreter profiling") \ 2687 \ 2688 develop(bool, VerifyCompiledCode, false, \ 2689 "Include miscellaneous runtime verifications in nmethod code; " \ 2690 "default off because it disturbs nmethod size heuristics") \ 2691 \ 2692 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2693 "Manually make GC thread crash then dump java stack trace; " \ 2694 "Test only") \ 2695 \ 2696 /* compilation */ \ 2697 product(bool, UseCompiler, true, \ 2698 "use compilation") \ 2699 \ 2700 develop(bool, TraceCompilationPolicy, false, \ 2701 "Trace compilation policy") \ 2702 \ 2703 develop(bool, TimeCompilationPolicy, false, \ 2704 "Time the compilation policy") \ 2705 \ 2706 product(bool, UseCounterDecay, true, \ 2707 "adjust recompilation counters") \ 2708 \ 2709 develop(intx, CounterHalfLifeTime, 30, \ 2710 "half-life time of invocation counters (in secs)") \ 2711 \ 2712 develop(intx, CounterDecayMinIntervalLength, 500, \ 2713 "Min. ms. between invocation of CounterDecay") \ 2714 \ 2715 product(bool, AlwaysCompileLoopMethods, false, \ 2716 "when using recompilation, never interpret methods " \ 2717 "containing loops") \ 2718 \ 2719 product(bool, DontCompileHugeMethods, true, \ 2720 "don't compile methods > HugeMethodLimit") \ 2721 \ 2722 /* Bytecode escape analysis estimation. */ \ 2723 product(bool, EstimateArgEscape, true, \ 2724 "Analyze bytecodes to estimate escape state of arguments") \ 2725 \ 2726 product(intx, BCEATraceLevel, 0, \ 2727 "How much tracing to do of bytecode escape analysis estimates") \ 2728 \ 2729 product(intx, MaxBCEAEstimateLevel, 5, \ 2730 "Maximum number of nested calls that are analyzed by BC EA.") \ 2731 \ 2732 product(intx, MaxBCEAEstimateSize, 150, \ 2733 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2734 \ 2735 product(intx, AllocatePrefetchStyle, 1, \ 2736 "0 = no prefetch, " \ 2737 "1 = prefetch instructions for each allocation, " \ 2738 "2 = use TLAB watermark to gate allocation prefetch, " \ 2739 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2740 \ 2741 product(intx, AllocatePrefetchDistance, -1, \ 2742 "Distance to prefetch ahead of allocation pointer") \ 2743 \ 2744 product(intx, AllocatePrefetchLines, 1, \ 2745 "Number of lines to prefetch ahead of allocation pointer") \ 2746 \ 2747 product(intx, AllocatePrefetchStepSize, 16, \ 2748 "Step size in bytes of sequential prefetch instructions") \ 2749 \ 2750 product(intx, AllocatePrefetchInstr, 0, \ 2751 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2752 \ 2753 product(intx, ReadPrefetchInstr, 0, \ 2754 "Prefetch instruction to prefetch ahead") \ 2755 \ 2756 /* deoptimization */ \ 2757 develop(bool, TraceDeoptimization, false, \ 2758 "Trace deoptimization") \ 2759 \ 2760 develop(bool, DebugDeoptimization, false, \ 2761 "Tracing various information while debugging deoptimization") \ 2762 \ 2763 product(intx, SelfDestructTimer, 0, \ 2764 "Will cause VM to terminate after a given time (in minutes) " \ 2765 "(0 means off)") \ 2766 \ 2767 product(intx, MaxJavaStackTraceDepth, 1024, \ 2768 "Max. no. of lines in the stack trace for Java exceptions " \ 2769 "(0 means all)") \ 2770 \ 2771 develop(intx, GuaranteedSafepointInterval, 1000, \ 2772 "Guarantee a safepoint (at least) every so many milliseconds " \ 2773 "(0 means none)") \ 2774 \ 2775 product(intx, SafepointTimeoutDelay, 10000, \ 2776 "Delay in milliseconds for option SafepointTimeout") \ 2777 \ 2778 product(intx, NmethodSweepFraction, 4, \ 2779 "Number of invocations of sweeper to cover all nmethods") \ 2780 \ 2781 product(intx, NmethodSweepCheckInterval, 5, \ 2782 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2783 \ 2784 notproduct(intx, MemProfilingInterval, 500, \ 2785 "Time between each invocation of the MemProfiler") \ 2786 \ 2787 develop(intx, MallocCatchPtr, -1, \ 2788 "Hit breakpoint when mallocing/freeing this pointer") \ 2789 \ 2790 notproduct(intx, AssertRepeat, 1, \ 2791 "number of times to evaluate expression in assert " \ 2792 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2793 \ 2794 notproduct(ccstrlist, SuppressErrorAt, "", \ 2795 "List of assertions (file:line) to muzzle") \ 2796 \ 2797 notproduct(uintx, HandleAllocationLimit, 1024, \ 2798 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2799 "is used") \ 2800 \ 2801 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2802 "Threshold for total handle allocation when " \ 2803 "+TraceHandleAllocation is used") \ 2804 \ 2805 develop(intx, StackPrintLimit, 100, \ 2806 "number of stack frames to print in VM-level stack dump") \ 2807 \ 2808 notproduct(intx, MaxElementPrintSize, 256, \ 2809 "maximum number of elements to print") \ 2810 \ 2811 notproduct(intx, MaxSubklassPrintSize, 4, \ 2812 "maximum number of subklasses to print when printing klass") \ 2813 \ 2814 product(intx, MaxInlineLevel, 9, \ 2815 "maximum number of nested calls that are inlined") \ 2816 \ 2817 product(intx, MaxRecursiveInlineLevel, 1, \ 2818 "maximum number of nested recursive calls that are inlined") \ 2819 \ 2820 product_pd(intx, InlineSmallCode, \ 2821 "Only inline already compiled methods if their code size is " \ 2822 "less than this") \ 2823 \ 2824 product(intx, MaxInlineSize, 35, \ 2825 "maximum bytecode size of a method to be inlined") \ 2826 \ 2827 product_pd(intx, FreqInlineSize, \ 2828 "maximum bytecode size of a frequent method to be inlined") \ 2829 \ 2830 product(intx, MaxTrivialSize, 6, \ 2831 "maximum bytecode size of a trivial method to be inlined") \ 2832 \ 2833 product(intx, MinInliningThreshold, 250, \ 2834 "min. invocation count a method needs to have to be inlined") \ 2835 \ 2836 develop(intx, AlignEntryCode, 4, \ 2837 "aligns entry code to specified value (in bytes)") \ 2838 \ 2839 develop(intx, MethodHistogramCutoff, 100, \ 2840 "cutoff value for method invoc. histogram (+CountCalls)") \ 2841 \ 2842 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2843 "# of interpreted methods to show in profile") \ 2844 \ 2845 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2846 "# of compiled methods to show in profile") \ 2847 \ 2848 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2849 "# of stub methods to show in profile") \ 2850 \ 2851 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2852 "# of runtime stub nodes to show in profile") \ 2853 \ 2854 product(intx, ProfileIntervalsTicks, 100, \ 2855 "# of ticks between printing of interval profile " \ 2856 "(+ProfileIntervals)") \ 2857 \ 2858 notproduct(intx, ScavengeALotInterval, 1, \ 2859 "Interval between which scavenge will occur with +ScavengeALot") \ 2860 \ 2861 notproduct(intx, FullGCALotInterval, 1, \ 2862 "Interval between which full gc will occur with +FullGCALot") \ 2863 \ 2864 notproduct(intx, FullGCALotStart, 0, \ 2865 "For which invocation to start FullGCAlot") \ 2866 \ 2867 notproduct(intx, FullGCALotDummies, 32*K, \ 2868 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2869 "to move") \ 2870 \ 2871 develop(intx, DontYieldALotInterval, 10, \ 2872 "Interval between which yields will be dropped (milliseconds)") \ 2873 \ 2874 develop(intx, MinSleepInterval, 1, \ 2875 "Minimum sleep() interval (milliseconds) when " \ 2876 "ConvertSleepToYield is off (used for SOLARIS)") \ 2877 \ 2878 product(intx, EventLogLength, 2000, \ 2879 "maximum nof events in event log") \ 2880 \ 2881 develop(intx, ProfilerPCTickThreshold, 15, \ 2882 "Number of ticks in a PC buckets to be a hotspot") \ 2883 \ 2884 notproduct(intx, DeoptimizeALotInterval, 5, \ 2885 "Number of exits until DeoptimizeALot kicks in") \ 2886 \ 2887 notproduct(intx, ZombieALotInterval, 5, \ 2888 "Number of exits until ZombieALot kicks in") \ 2889 \ 2890 develop(bool, StressNonEntrant, false, \ 2891 "Mark nmethods non-entrant at registration") \ 2892 \ 2893 diagnostic(intx, MallocVerifyInterval, 0, \ 2894 "if non-zero, verify C heap after every N calls to " \ 2895 "malloc/realloc/free") \ 2896 \ 2897 diagnostic(intx, MallocVerifyStart, 0, \ 2898 "if non-zero, start verifying C heap after Nth call to " \ 2899 "malloc/realloc/free") \ 2900 \ 2901 product(intx, TypeProfileWidth, 2, \ 2902 "number of receiver types to record in call/cast profile") \ 2903 \ 2904 develop(intx, BciProfileWidth, 2, \ 2905 "number of return bci's to record in ret profile") \ 2906 \ 2907 product(intx, PerMethodRecompilationCutoff, 400, \ 2908 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2909 \ 2910 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2911 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2912 \ 2913 product(intx, PerMethodTrapLimit, 100, \ 2914 "Limit on traps (of one kind) in a method (includes inlines)") \ 2915 \ 2916 product(intx, PerBytecodeTrapLimit, 4, \ 2917 "Limit on traps (of one kind) at a particular BCI") \ 2918 \ 2919 develop(intx, FreqCountInvocations, 1, \ 2920 "Scaling factor for branch frequencies (deprecated)") \ 2921 \ 2922 develop(intx, InlineFrequencyRatio, 20, \ 2923 "Ratio of call site execution to caller method invocation") \ 2924 \ 2925 develop_pd(intx, InlineFrequencyCount, \ 2926 "Count of call site execution necessary to trigger frequent " \ 2927 "inlining") \ 2928 \ 2929 develop(intx, InlineThrowCount, 50, \ 2930 "Force inlining of interpreted methods that throw this often") \ 2931 \ 2932 develop(intx, InlineThrowMaxSize, 200, \ 2933 "Force inlining of throwing methods smaller than this") \ 2934 \ 2935 product(intx, AliasLevel, 3, \ 2936 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2937 "2 for class split, 3 for unique instances") \ 2938 \ 2939 develop(bool, VerifyAliases, false, \ 2940 "perform extra checks on the results of alias analysis") \ 2941 \ 2942 develop(intx, ProfilerNodeSize, 1024, \ 2943 "Size in K to allocate for the Profile Nodes of each thread") \ 2944 \ 2945 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2946 "Number of times to spin wait on a v8 atomic operation lock") \ 2947 \ 2948 product(intx, ReadSpinIterations, 100, \ 2949 "Number of read attempts before a yield (spin inner loop)") \ 2950 \ 2951 product_pd(intx, PreInflateSpin, \ 2952 "Number of times to spin wait before inflation") \ 2953 \ 2954 product(intx, PreBlockSpin, 10, \ 2955 "Number of times to spin in an inflated lock before going to " \ 2956 "an OS lock") \ 2957 \ 2958 /* gc parameters */ \ 2959 product(uintx, InitialHeapSize, 0, \ 2960 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2961 \ 2962 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2963 "Maximum heap size (in bytes)") \ 2964 \ 2965 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2966 "Initial tenured generation size (in bytes)") \ 2967 \ 2968 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2969 "Initial new generation size (in bytes)") \ 2970 \ 2971 product(uintx, MaxNewSize, max_uintx, \ 2972 "Maximum new generation size (in bytes), max_uintx means set " \ 2973 "ergonomically") \ 2974 \ 2975 product(uintx, PretenureSizeThreshold, 0, \ 2976 "Maximum size in bytes of objects allocated in DefNew " \ 2977 "generation; zero means no maximum") \ 2978 \ 2979 product(uintx, TLABSize, 0, \ 2980 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2981 \ 2982 product(uintx, MinTLABSize, 2*K, \ 2983 "Minimum allowed TLAB size (in bytes)") \ 2984 \ 2985 product(uintx, TLABAllocationWeight, 35, \ 2986 "Allocation averaging weight") \ 2987 \ 2988 product(uintx, TLABWasteTargetPercent, 1, \ 2989 "Percentage of Eden that can be wasted") \ 2990 \ 2991 product(uintx, TLABRefillWasteFraction, 64, \ 2992 "Max TLAB waste at a refill (internal fragmentation)") \ 2993 \ 2994 product(uintx, TLABWasteIncrement, 4, \ 2995 "Increment allowed waste at slow allocation") \ 2996 \ 2997 product(intx, SurvivorRatio, 8, \ 2998 "Ratio of eden/survivor space size") \ 2999 \ 3000 product(intx, NewRatio, 2, \ 3001 "Ratio of new/old generation sizes") \ 3002 \ 3003 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 3004 "Max percent of eden objects that will be live at scavenge") \ 3005 \ 3006 product_pd(uintx, NewSizeThreadIncrease, \ 3007 "Additional size added to desired new generation size per " \ 3008 "non-daemon thread (in bytes)") \ 3009 \ 3010 product_pd(uintx, PermSize, \ 3011 "Initial size of permanent generation (in bytes)") \ 3012 \ 3013 product_pd(uintx, MaxPermSize, \ 3014 "Maximum size of permanent generation (in bytes)") \ 3015 \ 3016 product(uintx, MinHeapFreeRatio, 40, \ 3017 "Min percentage of heap free after GC to avoid expansion") \ 3018 \ 3019 product(uintx, MaxHeapFreeRatio, 70, \ 3020 "Max percentage of heap free after GC to avoid shrinking") \ 3021 \ 3022 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3023 "Number of milliseconds per MB of free space in the heap") \ 3024 \ 3025 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3026 "Min change in heap space due to GC (in bytes)") \ 3027 \ 3028 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3029 "Min expansion of permanent heap (in bytes)") \ 3030 \ 3031 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3032 "Max expansion of permanent heap without full GC (in bytes)") \ 3033 \ 3034 product(intx, QueuedAllocationWarningCount, 0, \ 3035 "Number of times an allocation that queues behind a GC " \ 3036 "will retry before printing a warning") \ 3037 \ 3038 diagnostic(uintx, VerifyGCStartAt, 0, \ 3039 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3040 \ 3041 diagnostic(intx, VerifyGCLevel, 0, \ 3042 "Generation level at which to start +VerifyBefore/AfterGC") \ 3043 \ 3044 develop(uintx, ExitAfterGCNum, 0, \ 3045 "If non-zero, exit after this GC.") \ 3046 \ 3047 product(intx, MaxTenuringThreshold, 15, \ 3048 "Maximum value for tenuring threshold") \ 3049 \ 3050 product(intx, InitialTenuringThreshold, 7, \ 3051 "Initial value for tenuring threshold") \ 3052 \ 3053 product(intx, TargetSurvivorRatio, 50, \ 3054 "Desired percentage of survivor space used after scavenge") \ 3055 \ 3056 product(uintx, MarkSweepDeadRatio, 5, \ 3057 "Percentage (0-100) of the old gen allowed as dead wood." \ 3058 "Serial mark sweep treats this as both the min and max value." \ 3059 "CMS uses this value only if it falls back to mark sweep." \ 3060 "Par compact uses a variable scale based on the density of the" \ 3061 "generation and treats this as the max value when the heap is" \ 3062 "either completely full or completely empty. Par compact also" \ 3063 "has a smaller default value; see arguments.cpp.") \ 3064 \ 3065 product(uintx, PermMarkSweepDeadRatio, 20, \ 3066 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3067 "See MarkSweepDeadRatio for collector-specific comments.") \ 3068 \ 3069 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3070 "How often should we fully compact the heap (ignoring the dead " \ 3071 "space parameters)") \ 3072 \ 3073 product(intx, PrintCMSStatistics, 0, \ 3074 "Statistics for CMS") \ 3075 \ 3076 product(bool, PrintCMSInitiationStatistics, false, \ 3077 "Statistics for initiating a CMS collection") \ 3078 \ 3079 product(intx, PrintFLSStatistics, 0, \ 3080 "Statistics for CMS' FreeListSpace") \ 3081 \ 3082 product(intx, PrintFLSCensus, 0, \ 3083 "Census for CMS' FreeListSpace") \ 3084 \ 3085 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3086 "Delay in ms between expansion and allocation") \ 3087 \ 3088 product(intx, DeferThrSuspendLoopCount, 4000, \ 3089 "(Unstable) Number of times to iterate in safepoint loop " \ 3090 " before blocking VM threads ") \ 3091 \ 3092 product(intx, DeferPollingPageLoopCount, -1, \ 3093 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3094 "before changing safepoint polling page to RO ") \ 3095 \ 3096 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3097 \ 3098 product(bool, PSChunkLargeArrays, true, \ 3099 "true: process large arrays in chunks") \ 3100 \ 3101 product(uintx, GCDrainStackTargetSize, 64, \ 3102 "how many entries we'll try to leave on the stack during " \ 3103 "parallel GC") \ 3104 \ 3105 /* stack parameters */ \ 3106 product_pd(intx, StackYellowPages, \ 3107 "Number of yellow zone (recoverable overflows) pages") \ 3108 \ 3109 product_pd(intx, StackRedPages, \ 3110 "Number of red zone (unrecoverable overflows) pages") \ 3111 \ 3112 product_pd(intx, StackShadowPages, \ 3113 "Number of shadow zone (for overflow checking) pages" \ 3114 " this should exceed the depth of the VM and native call stack") \ 3115 \ 3116 product_pd(intx, ThreadStackSize, \ 3117 "Thread Stack Size (in Kbytes)") \ 3118 \ 3119 product_pd(intx, VMThreadStackSize, \ 3120 "Non-Java Thread Stack Size (in Kbytes)") \ 3121 \ 3122 product_pd(intx, CompilerThreadStackSize, \ 3123 "Compiler Thread Stack Size (in Kbytes)") \ 3124 \ 3125 develop_pd(uintx, JVMInvokeMethodSlack, \ 3126 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3127 \ 3128 product(uintx, ThreadSafetyMargin, 50*M, \ 3129 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3130 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3131 "disable this feature") \ 3132 \ 3133 /* code cache parameters */ \ 3134 develop(uintx, CodeCacheSegmentSize, 64, \ 3135 "Code cache segment size (in bytes) - smallest unit of " \ 3136 "allocation") \ 3137 \ 3138 develop_pd(intx, CodeEntryAlignment, \ 3139 "Code entry alignment for generated code (in bytes)") \ 3140 \ 3141 product_pd(intx, OptoLoopAlignment, \ 3142 "Align inner loops to zero relative to this modulus") \ 3143 \ 3144 product_pd(uintx, InitialCodeCacheSize, \ 3145 "Initial code cache size (in bytes)") \ 3146 \ 3147 product_pd(uintx, ReservedCodeCacheSize, \ 3148 "Reserved code cache size (in bytes) - maximum code cache size") \ 3149 \ 3150 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3151 "When less than X space left, we stop compiling.") \ 3152 \ 3153 product_pd(uintx, CodeCacheExpansionSize, \ 3154 "Code cache expansion size (in bytes)") \ 3155 \ 3156 develop_pd(uintx, CodeCacheMinBlockLength, \ 3157 "Minimum number of segments in a code cache block.") \ 3158 \ 3159 notproduct(bool, ExitOnFullCodeCache, false, \ 3160 "Exit the VM if we fill the code cache.") \ 3161 \ 3162 product(bool, UseCodeCacheFlushing, false, \ 3163 "Attempt to clean the code cache before shutting off compiler") \ 3164 \ 3165 product(intx, MinCodeCacheFlushingInterval, 30, \ 3166 "Min number of seconds between code cache cleaning sessions") \ 3167 \ 3168 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3169 "When less than X space left, start code cache cleaning") \ 3170 \ 3171 /* interpreter debugging */ \ 3172 develop(intx, BinarySwitchThreshold, 5, \ 3173 "Minimal number of lookupswitch entries for rewriting to binary " \ 3174 "switch") \ 3175 \ 3176 develop(intx, StopInterpreterAt, 0, \ 3177 "Stops interpreter execution at specified bytecode number") \ 3178 \ 3179 develop(intx, TraceBytecodesAt, 0, \ 3180 "Traces bytecodes starting with specified bytecode number") \ 3181 \ 3182 /* compiler interface */ \ 3183 develop(intx, CIStart, 0, \ 3184 "the id of the first compilation to permit") \ 3185 \ 3186 develop(intx, CIStop, -1, \ 3187 "the id of the last compilation to permit") \ 3188 \ 3189 develop(intx, CIStartOSR, 0, \ 3190 "the id of the first osr compilation to permit " \ 3191 "(CICountOSR must be on)") \ 3192 \ 3193 develop(intx, CIStopOSR, -1, \ 3194 "the id of the last osr compilation to permit " \ 3195 "(CICountOSR must be on)") \ 3196 \ 3197 develop(intx, CIBreakAtOSR, -1, \ 3198 "id of osr compilation to break at") \ 3199 \ 3200 develop(intx, CIBreakAt, -1, \ 3201 "id of compilation to break at") \ 3202 \ 3203 product(ccstrlist, CompileOnly, "", \ 3204 "List of methods (pkg/class.name) to restrict compilation to") \ 3205 \ 3206 product(ccstr, CompileCommandFile, NULL, \ 3207 "Read compiler commands from this file [.hotspot_compiler]") \ 3208 \ 3209 product(ccstrlist, CompileCommand, "", \ 3210 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3211 \ 3212 product(bool, CICompilerCountPerCPU, false, \ 3213 "1 compiler thread for log(N CPUs)") \ 3214 \ 3215 develop(intx, CIFireOOMAt, -1, \ 3216 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3217 "(non-negative value throws OOM after this many CI accesses " \ 3218 "in each compile)") \ 3219 \ 3220 develop(intx, CIFireOOMAtDelay, -1, \ 3221 "Wait for this many CI accesses to occur in all compiles before " \ 3222 "beginning to throw OutOfMemoryErrors in each compile") \ 3223 \ 3224 notproduct(bool, CIObjectFactoryVerify, false, \ 3225 "enable potentially expensive verification in ciObjectFactory") \ 3226 \ 3227 /* Priorities */ \ 3228 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3229 \ 3230 product(intx, ThreadPriorityPolicy, 0, \ 3231 "0 : Normal. "\ 3232 " VM chooses priorities that are appropriate for normal "\ 3233 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3234 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3235 " map to lower native priority values. On Windows applications"\ 3236 " are allowed to use higher native priorities. However, with "\ 3237 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3238 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3239 " interfere with system threads. On Linux thread priorities "\ 3240 " are ignored because the OS does not support static priority "\ 3241 " in SCHED_OTHER scheduling class which is the only choice for"\ 3242 " non-root, non-realtime applications. "\ 3243 "1 : Aggressive. "\ 3244 " Java thread priorities map over to the entire range of "\ 3245 " native thread priorities. Higher Java thread priorities map "\ 3246 " to higher native thread priorities. This policy should be "\ 3247 " used with care, as sometimes it can cause performance "\ 3248 " degradation in the application and/or the entire system. On "\ 3249 " Linux this policy requires root privilege.") \ 3250 \ 3251 product(bool, ThreadPriorityVerbose, false, \ 3252 "print priority changes") \ 3253 \ 3254 product(intx, DefaultThreadPriority, -1, \ 3255 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3256 \ 3257 product(intx, CompilerThreadPriority, -1, \ 3258 "what priority should compiler threads run at (-1 means no change)") \ 3259 \ 3260 product(intx, VMThreadPriority, -1, \ 3261 "what priority should VM threads run at (-1 means no change)") \ 3262 \ 3263 product(bool, CompilerThreadHintNoPreempt, true, \ 3264 "(Solaris only) Give compiler threads an extra quanta") \ 3265 \ 3266 product(bool, VMThreadHintNoPreempt, false, \ 3267 "(Solaris only) Give VM thread an extra quanta") \ 3268 \ 3269 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3270 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3271 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3272 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3273 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3274 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3275 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3276 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3277 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3278 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3279 \ 3280 /* compiler debugging */ \ 3281 notproduct(intx, CompileTheWorldStartAt, 1, \ 3282 "First class to consider when using +CompileTheWorld") \ 3283 \ 3284 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3285 "Last class to consider when using +CompileTheWorld") \ 3286 \ 3287 develop(intx, NewCodeParameter, 0, \ 3288 "Testing Only: Create a dedicated integer parameter before " \ 3289 "putback") \ 3290 \ 3291 /* new oopmap storage allocation */ \ 3292 develop(intx, MinOopMapAllocation, 8, \ 3293 "Minimum number of OopMap entries in an OopMapSet") \ 3294 \ 3295 /* Background Compilation */ \ 3296 develop(intx, LongCompileThreshold, 50, \ 3297 "Used with +TraceLongCompiles") \ 3298 \ 3299 product(intx, StarvationMonitorInterval, 200, \ 3300 "Pause between each check in ms") \ 3301 \ 3302 /* recompilation */ \ 3303 product_pd(intx, CompileThreshold, \ 3304 "number of interpreted method invocations before (re-)compiling") \ 3305 \ 3306 product_pd(intx, BackEdgeThreshold, \ 3307 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3308 \ 3309 product(intx, Tier1BytecodeLimit, 10, \ 3310 "Must have at least this many bytecodes before tier1" \ 3311 "invocation counters are used") \ 3312 \ 3313 product_pd(intx, Tier2CompileThreshold, \ 3314 "threshold at which a tier 2 compilation is invoked") \ 3315 \ 3316 product_pd(intx, Tier2BackEdgeThreshold, \ 3317 "Back edge threshold at which a tier 2 compilation is invoked") \ 3318 \ 3319 product_pd(intx, Tier3CompileThreshold, \ 3320 "threshold at which a tier 3 compilation is invoked") \ 3321 \ 3322 product_pd(intx, Tier3BackEdgeThreshold, \ 3323 "Back edge threshold at which a tier 3 compilation is invoked") \ 3324 \ 3325 product_pd(intx, Tier4CompileThreshold, \ 3326 "threshold at which a tier 4 compilation is invoked") \ 3327 \ 3328 product_pd(intx, Tier4BackEdgeThreshold, \ 3329 "Back edge threshold at which a tier 4 compilation is invoked") \ 3330 \ 3331 product_pd(bool, TieredCompilation, \ 3332 "Enable two-tier compilation") \ 3333 \ 3334 product(bool, StressTieredRuntime, false, \ 3335 "Alternate client and server compiler on compile requests") \ 3336 \ 3337 product_pd(intx, OnStackReplacePercentage, \ 3338 "NON_TIERED number of method invocations/branches (expressed as %"\ 3339 "of CompileThreshold) before (re-)compiling OSR code") \ 3340 \ 3341 product(intx, InterpreterProfilePercentage, 33, \ 3342 "NON_TIERED number of method invocations/branches (expressed as %"\ 3343 "of CompileThreshold) before profiling in the interpreter") \ 3344 \ 3345 develop(intx, MaxRecompilationSearchLength, 10, \ 3346 "max. # frames to inspect searching for recompilee") \ 3347 \ 3348 develop(intx, MaxInterpretedSearchLength, 3, \ 3349 "max. # interp. frames to skip when searching for recompilee") \ 3350 \ 3351 develop(intx, DesiredMethodLimit, 8000, \ 3352 "desired max. method size (in bytecodes) after inlining") \ 3353 \ 3354 develop(intx, HugeMethodLimit, 8000, \ 3355 "don't compile methods larger than this if " \ 3356 "+DontCompileHugeMethods") \ 3357 \ 3358 /* New JDK 1.4 reflection implementation */ \ 3359 \ 3360 develop(bool, UseNewReflection, true, \ 3361 "Temporary flag for transition to reflection based on dynamic " \ 3362 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3363 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3364 "changes were needed") \ 3365 \ 3366 develop(bool, VerifyReflectionBytecodes, false, \ 3367 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3368 "in situations like that described in 4486457 or for " \ 3369 "constructors generated for serialization, so can not be enabled "\ 3370 "in product.") \ 3371 \ 3372 product(bool, ReflectionWrapResolutionErrors, true, \ 3373 "Temporary flag for transition to AbstractMethodError wrapped " \ 3374 "in InvocationTargetException. See 6531596") \ 3375 \ 3376 \ 3377 develop(intx, FastSuperclassLimit, 8, \ 3378 "Depth of hardwired instanceof accelerator array") \ 3379 \ 3380 /* Properties for Java libraries */ \ 3381 \ 3382 product(intx, MaxDirectMemorySize, -1, \ 3383 "Maximum total size of NIO direct-buffer allocations") \ 3384 \ 3385 /* temporary developer defined flags */ \ 3386 \ 3387 diagnostic(bool, UseNewCode, false, \ 3388 "Testing Only: Use the new version while testing") \ 3389 \ 3390 diagnostic(bool, UseNewCode2, false, \ 3391 "Testing Only: Use the new version while testing") \ 3392 \ 3393 diagnostic(bool, UseNewCode3, false, \ 3394 "Testing Only: Use the new version while testing") \ 3395 \ 3396 /* flags for performance data collection */ \ 3397 \ 3398 product(bool, UsePerfData, true, \ 3399 "Flag to disable jvmstat instrumentation for performance testing" \ 3400 "and problem isolation purposes.") \ 3401 \ 3402 product(bool, PerfDataSaveToFile, false, \ 3403 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3404 \ 3405 product(ccstr, PerfDataSaveFile, NULL, \ 3406 "Save PerfData memory to the specified absolute pathname," \ 3407 "%p in the file name if present will be replaced by pid") \ 3408 \ 3409 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3410 "Data sampling interval in milliseconds") \ 3411 \ 3412 develop(bool, PerfTraceDataCreation, false, \ 3413 "Trace creation of Performance Data Entries") \ 3414 \ 3415 develop(bool, PerfTraceMemOps, false, \ 3416 "Trace PerfMemory create/attach/detach calls") \ 3417 \ 3418 product(bool, PerfDisableSharedMem, false, \ 3419 "Store performance data in standard memory") \ 3420 \ 3421 product(intx, PerfDataMemorySize, 32*K, \ 3422 "Size of performance data memory region. Will be rounded " \ 3423 "up to a multiple of the native os page size.") \ 3424 \ 3425 product(intx, PerfMaxStringConstLength, 1024, \ 3426 "Maximum PerfStringConstant string length before truncation") \ 3427 \ 3428 product(bool, PerfAllowAtExitRegistration, false, \ 3429 "Allow registration of atexit() methods") \ 3430 \ 3431 product(bool, PerfBypassFileSystemCheck, false, \ 3432 "Bypass Win32 file system criteria checks (Windows Only)") \ 3433 \ 3434 product(intx, UnguardOnExecutionViolation, 0, \ 3435 "Unguard page and retry on no-execute fault (Win32 only)" \ 3436 "0=off, 1=conservative, 2=aggressive") \ 3437 \ 3438 /* Serviceability Support */ \ 3439 \ 3440 product(bool, ManagementServer, false, \ 3441 "Create JMX Management Server") \ 3442 \ 3443 product(bool, DisableAttachMechanism, false, \ 3444 "Disable mechanism that allows tools to attach to this VM") \ 3445 \ 3446 product(bool, StartAttachListener, false, \ 3447 "Always start Attach Listener at VM startup") \ 3448 \ 3449 manageable(bool, PrintConcurrentLocks, false, \ 3450 "Print java.util.concurrent locks in thread dump") \ 3451 \ 3452 /* Shared spaces */ \ 3453 \ 3454 product(bool, UseSharedSpaces, true, \ 3455 "Use shared spaces in the permanent generation") \ 3456 \ 3457 product(bool, RequireSharedSpaces, false, \ 3458 "Require shared spaces in the permanent generation") \ 3459 \ 3460 product(bool, ForceSharedSpaces, false, \ 3461 "Require shared spaces in the permanent generation") \ 3462 \ 3463 product(bool, DumpSharedSpaces, false, \ 3464 "Special mode: JVM reads a class list, loads classes, builds " \ 3465 "shared spaces, and dumps the shared spaces to a file to be " \ 3466 "used in future JVM runs.") \ 3467 \ 3468 product(bool, PrintSharedSpaces, false, \ 3469 "Print usage of shared spaces") \ 3470 \ 3471 product(uintx, SharedDummyBlockSize, 512*M, \ 3472 "Size of dummy block used to shift heap addresses (in bytes)") \ 3473 \ 3474 product(uintx, SharedReadWriteSize, 12*M, \ 3475 "Size of read-write space in permanent generation (in bytes)") \ 3476 \ 3477 product(uintx, SharedReadOnlySize, 10*M, \ 3478 "Size of read-only space in permanent generation (in bytes)") \ 3479 \ 3480 product(uintx, SharedMiscDataSize, 4*M, \ 3481 "Size of the shared data area adjacent to the heap (in bytes)") \ 3482 \ 3483 product(uintx, SharedMiscCodeSize, 4*M, \ 3484 "Size of the shared code area adjacent to the heap (in bytes)") \ 3485 \ 3486 diagnostic(bool, SharedOptimizeColdStart, true, \ 3487 "At dump time, order shared objects to achieve better " \ 3488 "cold startup time.") \ 3489 \ 3490 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3491 "Reordering policy for SharedOptimizeColdStart " \ 3492 "0=favor classload-time locality, 1=balanced, " \ 3493 "2=favor runtime locality") \ 3494 \ 3495 diagnostic(bool, SharedSkipVerify, false, \ 3496 "Skip assert() and verify() which page-in unwanted shared " \ 3497 "objects. ") \ 3498 \ 3499 product(bool, AnonymousClasses, false, \ 3500 "support sun.misc.Unsafe.defineAnonymousClass") \ 3501 \ 3502 experimental(bool, EnableMethodHandles, false, \ 3503 "support method handles (true by default under JSR 292)") \ 3504 \ 3505 diagnostic(intx, MethodHandlePushLimit, 3, \ 3506 "number of additional stack slots a method handle may push") \ 3507 \ 3508 develop(bool, TraceMethodHandles, false, \ 3509 "trace internal method handle operations") \ 3510 \ 3511 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3512 "perform extra checks when constructing method handles") \ 3513 \ 3514 diagnostic(bool, OptimizeMethodHandles, true, \ 3515 "when constructing method handles, try to improve them") \ 3516 \ 3517 experimental(bool, TrustFinalNonStaticFields, false, \ 3518 "trust final non-static declarations for constant folding") \ 3519 \ 3520 experimental(bool, EnableInvokeDynamic, false, \ 3521 "recognize the invokedynamic instruction") \ 3522 \ 3523 experimental(bool, AllowTransitionalJSR292, true, \ 3524 "recognize pre-PFD formats of invokedynamic") \ 3525 \ 3526 develop(bool, TraceInvokeDynamic, false, \ 3527 "trace internal invoke dynamic operations") \ 3528 \ 3529 diagnostic(bool, PauseAtStartup, false, \ 3530 "Causes the VM to pause at startup time and wait for the pause " \ 3531 "file to be removed (default: ./vm.paused.<pid>)") \ 3532 \ 3533 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3534 "The file to create and for whose removal to await when pausing " \ 3535 "at startup. (default: ./vm.paused.<pid>)") \ 3536 \ 3537 product(bool, ExtendedDTraceProbes, false, \ 3538 "Enable performance-impacting dtrace probes") \ 3539 \ 3540 product(bool, DTraceMethodProbes, false, \ 3541 "Enable dtrace probes for method-entry and method-exit") \ 3542 \ 3543 product(bool, DTraceAllocProbes, false, \ 3544 "Enable dtrace probes for object allocation") \ 3545 \ 3546 product(bool, DTraceMonitorProbes, false, \ 3547 "Enable dtrace probes for monitor events") \ 3548 \ 3549 product(bool, RelaxAccessControlCheck, false, \ 3550 "Relax the access control checks in the verifier") \ 3551 \ 3552 diagnostic(bool, PrintDTraceDOF, false, \ 3553 "Print the DTrace DOF passed to the system for JSDT probes") \ 3554 \ 3555 product(bool, UseVMInterruptibleIO, false, \ 3556 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3557 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3558 " of this flag is true for JDK 6 and earliers") 3559 3560/* 3561 * Macros for factoring of globals 3562 */ 3563 3564// Interface macros 3565#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3566#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3567#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3568#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3569#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3570#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3571#ifdef PRODUCT 3572#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3573#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3574#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3575#else 3576#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3577#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3578#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3579#endif 3580// Special LP64 flags, product only needed for now. 3581#ifdef _LP64 3582#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3583#else 3584#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3585#endif // _LP64 3586 3587// Implementation macros 3588#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3589#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3590#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3591#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3592#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3593#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3594#ifdef PRODUCT 3595#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3596#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3597#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3598#else 3599#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3600#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3601#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3602#endif 3603#ifdef _LP64 3604#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3605#else 3606#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3607#endif // _LP64 3608 3609RUNTIME_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) 3610 3611RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3612