globals.hpp revision 1807:cd3ef3fd20dd
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, BackEdgeThreshold, 0); 39 40define_pd_global(intx, OnStackReplacePercentage, 0); 41define_pd_global(bool, ResizeTLAB, false); 42define_pd_global(intx, FreqInlineSize, 0); 43define_pd_global(intx, InlineSmallCode, 0); 44define_pd_global(intx, NewSizeThreadIncrease, 4*K); 45define_pd_global(intx, InlineClassNatives, true); 46define_pd_global(intx, InlineUnsafeOps, true); 47define_pd_global(intx, InitialCodeCacheSize, 160*K); 48define_pd_global(intx, ReservedCodeCacheSize, 32*M); 49define_pd_global(intx, CodeCacheExpansionSize, 32*K); 50define_pd_global(intx, CodeCacheMinBlockLength, 1); 51define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 52define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 53define_pd_global(bool, NeverActAsServerClassMachine, true); 54define_pd_global(uint64_t,MaxRAM, 1ULL*G); 55#define CI_COMPILER_COUNT 0 56#else 57 58#ifdef COMPILER2 59#define CI_COMPILER_COUNT 2 60#else 61#define CI_COMPILER_COUNT 1 62#endif // COMPILER2 63 64#endif // no compilers 65 66 67// string type aliases used only in this file 68typedef const char* ccstr; 69typedef const char* ccstrlist; // represents string arguments which accumulate 70 71enum FlagValueOrigin { 72 DEFAULT = 0, 73 COMMAND_LINE = 1, 74 ENVIRON_VAR = 2, 75 CONFIG_FILE = 3, 76 MANAGEMENT = 4, 77 ERGONOMIC = 5, 78 ATTACH_ON_DEMAND = 6, 79 INTERNAL = 99 80}; 81 82struct Flag { 83 const char *type; 84 const char *name; 85 void* addr; 86 87 NOT_PRODUCT(const char *doc;) 88 89 const char *kind; 90 FlagValueOrigin origin; 91 92 // points to all Flags static array 93 static Flag *flags; 94 95 // number of flags 96 static size_t numFlags; 97 98 static Flag* find_flag(char* name, size_t length); 99 100 bool is_bool() const { return strcmp(type, "bool") == 0; } 101 bool get_bool() const { return *((bool*) addr); } 102 void set_bool(bool value) { *((bool*) addr) = value; } 103 104 bool is_intx() const { return strcmp(type, "intx") == 0; } 105 intx get_intx() const { return *((intx*) addr); } 106 void set_intx(intx value) { *((intx*) addr) = value; } 107 108 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 109 uintx get_uintx() const { return *((uintx*) addr); } 110 void set_uintx(uintx value) { *((uintx*) addr) = value; } 111 112 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 113 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 114 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 115 116 bool is_double() const { return strcmp(type, "double") == 0; } 117 double get_double() const { return *((double*) addr); } 118 void set_double(double value) { *((double*) addr) = value; } 119 120 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 121 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 122 ccstr get_ccstr() const { return *((ccstr*) addr); } 123 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 124 125 bool is_unlocker() const; 126 bool is_unlocked() const; 127 bool is_writeable() const; 128 bool is_external() const; 129 130 void print_on(outputStream* st, bool withComments = false ); 131 void print_as_flag(outputStream* st); 132}; 133 134// debug flags control various aspects of the VM and are global accessible 135 136// use FlagSetting to temporarily change some debug flag 137// e.g. FlagSetting fs(DebugThisAndThat, true); 138// restored to previous value upon leaving scope 139class FlagSetting { 140 bool val; 141 bool* flag; 142 public: 143 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 144 ~FlagSetting() { *flag = val; } 145}; 146 147 148class CounterSetting { 149 intx* counter; 150 public: 151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 152 ~CounterSetting() { (*counter)--; } 153}; 154 155 156class IntFlagSetting { 157 intx val; 158 intx* flag; 159 public: 160 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 161 ~IntFlagSetting() { *flag = val; } 162}; 163 164 165class DoubleFlagSetting { 166 double val; 167 double* flag; 168 public: 169 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 170 ~DoubleFlagSetting() { *flag = val; } 171}; 172 173 174class CommandLineFlags { 175 public: 176 static bool boolAt(char* name, size_t len, bool* value); 177 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 178 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 179 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 180 181 static bool intxAt(char* name, size_t len, intx* value); 182 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 183 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 184 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 185 186 static bool uintxAt(char* name, size_t len, uintx* value); 187 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 188 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 189 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 190 191 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 192 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 193 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 194 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 195 196 static bool doubleAt(char* name, size_t len, double* value); 197 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 198 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 199 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 200 201 static bool ccstrAt(char* name, size_t len, ccstr* value); 202 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 203 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 204 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 205 206 // Returns false if name is not a command line flag. 207 static bool wasSetOnCmdline(const char* name, bool* value); 208 static void printSetFlags(); 209 210 static void printFlags(bool withComments = false ); 211 212 static void verify() PRODUCT_RETURN; 213}; 214 215// use this for flags that are true by default in the debug version but 216// false in the optimized version, and vice versa 217#ifdef ASSERT 218#define trueInDebug true 219#define falseInDebug false 220#else 221#define trueInDebug false 222#define falseInDebug true 223#endif 224 225// use this for flags that are true per default in the product build 226// but false in development builds, and vice versa 227#ifdef PRODUCT 228#define trueInProduct true 229#define falseInProduct false 230#else 231#define trueInProduct false 232#define falseInProduct true 233#endif 234 235// use this for flags that are true per default in the tiered build 236// but false in non-tiered builds, and vice versa 237#ifdef TIERED 238#define trueInTiered true 239#define falseInTiered false 240#else 241#define trueInTiered false 242#define falseInTiered true 243#endif 244 245// develop flags are settable / visible only during development and are constant in the PRODUCT version 246// product flags are always settable / visible 247// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 248 249// A flag must be declared with one of the following types: 250// bool, intx, uintx, ccstr. 251// The type "ccstr" is an alias for "const char*" and is used 252// only in this file, because the macrology requires single-token type names. 253 254// Note: Diagnostic options not meant for VM tuning or for product modes. 255// They are to be used for VM quality assurance or field diagnosis 256// of VM bugs. They are hidden so that users will not be encouraged to 257// try them as if they were VM ordinary execution options. However, they 258// are available in the product version of the VM. Under instruction 259// from support engineers, VM customers can turn them on to collect 260// diagnostic information about VM problems. To use a VM diagnostic 261// option, you must first specify +UnlockDiagnosticVMOptions. 262// (This master switch also affects the behavior of -Xprintflags.) 263// 264// experimental flags are in support of features that are not 265// part of the officially supported product, but are available 266// for experimenting with. They could, for example, be performance 267// features that may not have undergone full or rigorous QA, but which may 268// help performance in some cases and released for experimentation 269// by the community of users and developers. This flag also allows one to 270// be able to build a fully supported product that nonetheless also 271// ships with some unsupported, lightly tested, experimental features. 272// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 273// UnlockExperimentalVMOptions flag, which allows the control and 274// modification of the experimental flags. 275// 276// Nota bene: neither diagnostic nor experimental options should be used casually, 277// and they are not supported on production loads, except under explicit 278// direction from support engineers. 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 notproduct(bool, ZapStackSegments, trueInDebug, \ 642 "Zap allocated/freed Stack segments with 0xFADFADED") \ 643 \ 644 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 645 "Zap unused heap space with 0xBAADBABE") \ 646 \ 647 develop(bool, TraceZapUnusedHeapArea, false, \ 648 "Trace zapping of unused heap space") \ 649 \ 650 develop(bool, CheckZapUnusedHeapArea, false, \ 651 "Check zapping of unused heap space") \ 652 \ 653 develop(bool, ZapFillerObjects, trueInDebug, \ 654 "Zap filler objects with 0xDEAFBABE") \ 655 \ 656 develop(bool, PrintVMMessages, true, \ 657 "Print vm messages on console") \ 658 \ 659 product(bool, PrintGCApplicationConcurrentTime, false, \ 660 "Print the time the application has been running") \ 661 \ 662 product(bool, PrintGCApplicationStoppedTime, false, \ 663 "Print the time the application has been stopped") \ 664 \ 665 notproduct(uintx, ErrorHandlerTest, 0, \ 666 "If > 0, provokes an error after VM initialization; the value" \ 667 "determines which error to provoke. See test_error_handler()" \ 668 "in debug.cpp.") \ 669 \ 670 develop(bool, Verbose, false, \ 671 "Prints additional debugging information from other modes") \ 672 \ 673 develop(bool, PrintMiscellaneous, false, \ 674 "Prints uncategorized debugging information (requires +Verbose)") \ 675 \ 676 develop(bool, WizardMode, false, \ 677 "Prints much more debugging information") \ 678 \ 679 product(bool, ShowMessageBoxOnError, false, \ 680 "Keep process alive on VM fatal error") \ 681 \ 682 product_pd(bool, UseOSErrorReporting, \ 683 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 684 \ 685 product(bool, SuppressFatalErrorMessage, false, \ 686 "Do NO Fatal Error report [Avoid deadlock]") \ 687 \ 688 product(ccstrlist, OnError, "", \ 689 "Run user-defined commands on fatal error; see VMError.cpp " \ 690 "for examples") \ 691 \ 692 product(ccstrlist, OnOutOfMemoryError, "", \ 693 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 694 \ 695 manageable(bool, HeapDumpBeforeFullGC, false, \ 696 "Dump heap to file before any major stop-world GC") \ 697 \ 698 manageable(bool, HeapDumpAfterFullGC, false, \ 699 "Dump heap to file after any major stop-world GC") \ 700 \ 701 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 702 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 703 \ 704 manageable(ccstr, HeapDumpPath, NULL, \ 705 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 706 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 707 "in the working directory)") \ 708 \ 709 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 710 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 711 "when the heap usage is larger than this") \ 712 \ 713 develop(uintx, HeapDumpSegmentSize, 1*G, \ 714 "Approximate segment size when generating a segmented heap dump") \ 715 \ 716 develop(bool, BreakAtWarning, false, \ 717 "Execute breakpoint upon encountering VM warning") \ 718 \ 719 product_pd(bool, UseVectoredExceptions, \ 720 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 721 \ 722 develop(bool, TraceVMOperation, false, \ 723 "Trace vm operations") \ 724 \ 725 develop(bool, UseFakeTimers, false, \ 726 "Tells whether the VM should use system time or a fake timer") \ 727 \ 728 diagnostic(bool, LogCompilation, false, \ 729 "Log compilation activity in detail to hotspot.log or LogFile") \ 730 \ 731 product(bool, PrintCompilation, false, \ 732 "Print compilations") \ 733 \ 734 diagnostic(bool, TraceNMethodInstalls, false, \ 735 "Trace nmethod intallation") \ 736 \ 737 diagnostic(intx, ScavengeRootsInCode, 0, \ 738 "0: do not allow scavengable oops in the code cache; " \ 739 "1: allow scavenging from the code cache; " \ 740 "2: emit as many constants as the compiler can see") \ 741 \ 742 diagnostic(bool, TraceOSRBreakpoint, false, \ 743 "Trace OSR Breakpoint ") \ 744 \ 745 diagnostic(bool, TraceCompileTriggered, false, \ 746 "Trace compile triggered") \ 747 \ 748 diagnostic(bool, TraceTriggers, false, \ 749 "Trace triggers") \ 750 \ 751 product(bool, AlwaysRestoreFPU, false, \ 752 "Restore the FPU control word after every JNI call (expensive)") \ 753 \ 754 notproduct(bool, PrintCompilation2, false, \ 755 "Print additional statistics per compilation") \ 756 \ 757 diagnostic(bool, PrintAdapterHandlers, false, \ 758 "Print code generated for i2c/c2i adapters") \ 759 \ 760 develop(bool, VerifyAdapterSharing, false, \ 761 "Verify that the code for shared adapters is the equivalent") \ 762 \ 763 diagnostic(bool, PrintAssembly, false, \ 764 "Print assembly code (using external disassembler.so)") \ 765 \ 766 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 767 "Options string passed to disassembler.so") \ 768 \ 769 diagnostic(bool, PrintNMethods, false, \ 770 "Print assembly code for nmethods when generated") \ 771 \ 772 diagnostic(bool, PrintNativeNMethods, false, \ 773 "Print assembly code for native nmethods when generated") \ 774 \ 775 develop(bool, PrintDebugInfo, false, \ 776 "Print debug information for all nmethods when generated") \ 777 \ 778 develop(bool, PrintRelocations, false, \ 779 "Print relocation information for all nmethods when generated") \ 780 \ 781 develop(bool, PrintDependencies, false, \ 782 "Print dependency information for all nmethods when generated") \ 783 \ 784 develop(bool, PrintExceptionHandlers, false, \ 785 "Print exception handler tables for all nmethods when generated") \ 786 \ 787 develop(bool, InterceptOSException, false, \ 788 "Starts debugger when an implicit OS (e.g., NULL) " \ 789 "exception happens") \ 790 \ 791 notproduct(bool, PrintCodeCache, false, \ 792 "Print the compiled_code cache when exiting") \ 793 \ 794 develop(bool, PrintCodeCache2, false, \ 795 "Print detailed info on the compiled_code cache when exiting") \ 796 \ 797 diagnostic(bool, PrintStubCode, false, \ 798 "Print generated stub code") \ 799 \ 800 product(bool, StackTraceInThrowable, true, \ 801 "Collect backtrace in throwable when exception happens") \ 802 \ 803 product(bool, OmitStackTraceInFastThrow, true, \ 804 "Omit backtraces for some 'hot' exceptions in optimized code") \ 805 \ 806 product(bool, ProfilerPrintByteCodeStatistics, false, \ 807 "Prints byte code statictics when dumping profiler output") \ 808 \ 809 product(bool, ProfilerRecordPC, false, \ 810 "Collects tick for each 16 byte interval of compiled code") \ 811 \ 812 product(bool, ProfileVM, false, \ 813 "Profiles ticks that fall within VM (either in the VM Thread " \ 814 "or VM code called through stubs)") \ 815 \ 816 product(bool, ProfileIntervals, false, \ 817 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 818 \ 819 notproduct(bool, ProfilerCheckIntervals, false, \ 820 "Collect and print info on spacing of profiler ticks") \ 821 \ 822 develop(bool, PrintJVMWarnings, false, \ 823 "Prints warnings for unimplemented JVM functions") \ 824 \ 825 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 826 "Prints warnings for stalled SpinLocks") \ 827 \ 828 develop(bool, InitializeJavaLangSystem, true, \ 829 "Initialize java.lang.System - turn off for individual " \ 830 "method debugging") \ 831 \ 832 develop(bool, InitializeJavaLangString, true, \ 833 "Initialize java.lang.String - turn off for individual " \ 834 "method debugging") \ 835 \ 836 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 837 "Initialize various error and exception classes - turn off for " \ 838 "individual method debugging") \ 839 \ 840 product(bool, RegisterFinalizersAtInit, true, \ 841 "Register finalizable objects at end of Object.<init> or " \ 842 "after allocation") \ 843 \ 844 develop(bool, RegisterReferences, true, \ 845 "Tells whether the VM should register soft/weak/final/phantom " \ 846 "references") \ 847 \ 848 develop(bool, IgnoreRewrites, false, \ 849 "Supress rewrites of bytecodes in the oopmap generator. " \ 850 "This is unsafe!") \ 851 \ 852 develop(bool, PrintCodeCacheExtension, false, \ 853 "Print extension of code cache") \ 854 \ 855 develop(bool, UsePrivilegedStack, true, \ 856 "Enable the security JVM functions") \ 857 \ 858 develop(bool, IEEEPrecision, true, \ 859 "Enables IEEE precision (for INTEL only)") \ 860 \ 861 develop(bool, ProtectionDomainVerification, true, \ 862 "Verifies protection domain before resolution in system " \ 863 "dictionary") \ 864 \ 865 product(bool, ClassUnloading, true, \ 866 "Do unloading of classes") \ 867 \ 868 diagnostic(bool, LinkWellKnownClasses, false, \ 869 "Resolve a well known class as soon as its name is seen") \ 870 \ 871 develop(bool, DisableStartThread, false, \ 872 "Disable starting of additional Java threads " \ 873 "(for debugging only)") \ 874 \ 875 develop(bool, MemProfiling, false, \ 876 "Write memory usage profiling to log file") \ 877 \ 878 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 879 "Prints the system dictionary at exit") \ 880 \ 881 diagnostic(bool, UnsyncloadClass, false, \ 882 "Unstable: VM calls loadClass unsynchronized. Custom " \ 883 "class loader must call VM synchronized for findClass " \ 884 "and defineClass.") \ 885 \ 886 product(bool, AlwaysLockClassLoader, false, \ 887 "Require the VM to acquire the class loader lock before calling " \ 888 "loadClass() even for class loaders registering " \ 889 "as parallel capable") \ 890 \ 891 product(bool, AllowParallelDefineClass, false, \ 892 "Allow parallel defineClass requests for class loaders " \ 893 "registering as parallel capable") \ 894 \ 895 product(bool, MustCallLoadClassInternal, false, \ 896 "Call loadClassInternal() rather than loadClass()") \ 897 \ 898 product_pd(bool, DontYieldALot, \ 899 "Throw away obvious excess yield calls (for SOLARIS only)") \ 900 \ 901 product_pd(bool, ConvertSleepToYield, \ 902 "Converts sleep(0) to thread yield " \ 903 "(may be off for SOLARIS to improve GUI)") \ 904 \ 905 product(bool, ConvertYieldToSleep, false, \ 906 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 907 "behavior (SOLARIS only)") \ 908 \ 909 product(bool, UseBoundThreads, true, \ 910 "Bind user level threads to kernel threads (for SOLARIS only)") \ 911 \ 912 develop(bool, UseDetachedThreads, true, \ 913 "Use detached threads that are recycled upon termination " \ 914 "(for SOLARIS only)") \ 915 \ 916 product(bool, UseLWPSynchronization, true, \ 917 "Use LWP-based instead of libthread-based synchronization " \ 918 "(SPARC only)") \ 919 \ 920 product(ccstr, SyncKnobs, NULL, \ 921 "(Unstable) Various monitor synchronization tunables") \ 922 \ 923 product(intx, EmitSync, 0, \ 924 "(Unsafe,Unstable) " \ 925 " Controls emission of inline sync fast-path code") \ 926 \ 927 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 928 \ 929 product(intx, MonitorBound, 0, "Bound Monitor population") \ 930 \ 931 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 932 \ 933 product(intx, Atomics, 0, \ 934 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 935 \ 936 product(intx, FenceInstruction, 0, \ 937 "(Unsafe,Unstable) Experimental") \ 938 \ 939 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 940 \ 941 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 942 \ 943 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 944 \ 945 product(intx, hashCode, 0, \ 946 "(Unstable) select hashCode generation algorithm" ) \ 947 \ 948 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 949 "(Unstable, Linux-specific)" \ 950 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 951 \ 952 product(bool, FilterSpuriousWakeups, true, \ 953 "Prevent spurious or premature wakeups from object.wait " \ 954 "(Solaris only)") \ 955 \ 956 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 957 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 958 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 959 \ 960 develop(bool, UsePthreads, false, \ 961 "Use pthread-based instead of libthread-based synchronization " \ 962 "(SPARC only)") \ 963 \ 964 product(bool, AdjustConcurrency, false, \ 965 "call thr_setconcurrency at thread create time to avoid " \ 966 "LWP starvation on MP systems (For Solaris Only)") \ 967 \ 968 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 969 "Should the system attempt to update the compiler file when " \ 970 "an error occurs?") \ 971 \ 972 product(bool, ReduceSignalUsage, false, \ 973 "Reduce the use of OS signals in Java and/or the VM") \ 974 \ 975 notproduct(bool, ValidateMarkSweep, false, \ 976 "Do extra validation during MarkSweep collection") \ 977 \ 978 notproduct(bool, RecordMarkSweepCompaction, false, \ 979 "Enable GC-to-GC recording and querying of compaction during " \ 980 "MarkSweep") \ 981 \ 982 develop_pd(bool, ShareVtableStubs, \ 983 "Share vtable stubs (smaller code but worse branch prediction") \ 984 \ 985 develop(bool, LoadLineNumberTables, true, \ 986 "Tells whether the class file parser loads line number tables") \ 987 \ 988 develop(bool, LoadLocalVariableTables, true, \ 989 "Tells whether the class file parser loads local variable tables")\ 990 \ 991 develop(bool, LoadLocalVariableTypeTables, true, \ 992 "Tells whether the class file parser loads local variable type tables")\ 993 \ 994 product(bool, AllowUserSignalHandlers, false, \ 995 "Do not complain if the application installs signal handlers " \ 996 "(Solaris & Linux only)") \ 997 \ 998 product(bool, UseSignalChaining, true, \ 999 "Use signal-chaining to invoke signal handlers installed " \ 1000 "by the application (Solaris & Linux only)") \ 1001 \ 1002 product(bool, UseAltSigs, false, \ 1003 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1004 "internal signals (Solaris only)") \ 1005 \ 1006 product(bool, UseSpinning, false, \ 1007 "Use spinning in monitor inflation and before entry") \ 1008 \ 1009 product(bool, PreSpinYield, false, \ 1010 "Yield before inner spinning loop") \ 1011 \ 1012 product(bool, PostSpinYield, true, \ 1013 "Yield after inner spinning loop") \ 1014 \ 1015 product(bool, AllowJNIEnvProxy, false, \ 1016 "Allow JNIEnv proxies for jdbx") \ 1017 \ 1018 product(bool, JNIDetachReleasesMonitors, true, \ 1019 "JNI DetachCurrentThread releases monitors owned by thread") \ 1020 \ 1021 product(bool, RestoreMXCSROnJNICalls, false, \ 1022 "Restore MXCSR when returning from JNI calls") \ 1023 \ 1024 product(bool, CheckJNICalls, false, \ 1025 "Verify all arguments to JNI calls") \ 1026 \ 1027 product(bool, UseFastJNIAccessors, true, \ 1028 "Use optimized versions of Get<Primitive>Field") \ 1029 \ 1030 product(bool, EagerXrunInit, false, \ 1031 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1032 " but not all -Xrun libraries may support the state of the VM at this time") \ 1033 \ 1034 product(bool, PreserveAllAnnotations, false, \ 1035 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1036 \ 1037 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1038 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1039 \ 1040 product(bool, LazyBootClassLoader, true, \ 1041 "Enable/disable lazy opening of boot class path entries") \ 1042 \ 1043 diagnostic(bool, UseIncDec, true, \ 1044 "Use INC, DEC instructions on x86") \ 1045 \ 1046 product(bool, UseNewLongLShift, false, \ 1047 "Use optimized bitwise shift left") \ 1048 \ 1049 product(bool, UseStoreImmI16, true, \ 1050 "Use store immediate 16-bits value instruction on x86") \ 1051 \ 1052 product(bool, UseAddressNop, false, \ 1053 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1054 \ 1055 product(bool, UseXmmLoadAndClearUpper, true, \ 1056 "Load low part of XMM register and clear upper part") \ 1057 \ 1058 product(bool, UseXmmRegToRegMoveAll, false, \ 1059 "Copy all XMM register bits when moving value between registers") \ 1060 \ 1061 product(bool, UseXmmI2D, false, \ 1062 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1063 \ 1064 product(bool, UseXmmI2F, false, \ 1065 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1066 \ 1067 product(bool, UseXMMForArrayCopy, false, \ 1068 "Use SSE2 MOVQ instruction for Arraycopy") \ 1069 \ 1070 product(bool, UseUnalignedLoadStores, false, \ 1071 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1072 \ 1073 product(intx, FieldsAllocationStyle, 1, \ 1074 "0 - type based with oops first, 1 - with oops last, " \ 1075 "2 - oops in super and sub classes are together") \ 1076 \ 1077 product(bool, CompactFields, true, \ 1078 "Allocate nonstatic fields in gaps between previous fields") \ 1079 \ 1080 notproduct(bool, PrintCompactFieldsSavings, false, \ 1081 "Print how many words were saved with CompactFields") \ 1082 \ 1083 product(bool, UseBiasedLocking, true, \ 1084 "Enable biased locking in JVM") \ 1085 \ 1086 product(intx, BiasedLockingStartupDelay, 4000, \ 1087 "Number of milliseconds to wait before enabling biased locking") \ 1088 \ 1089 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1090 "Print statistics of biased locking in JVM") \ 1091 \ 1092 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1093 "Threshold of number of revocations per type to try to " \ 1094 "rebias all objects in the heap of that type") \ 1095 \ 1096 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1097 "Threshold of number of revocations per type to permanently " \ 1098 "revoke biases of all objects in the heap of that type") \ 1099 \ 1100 product(intx, BiasedLockingDecayTime, 25000, \ 1101 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1102 "type after previous bulk rebias") \ 1103 \ 1104 /* tracing */ \ 1105 \ 1106 notproduct(bool, TraceRuntimeCalls, false, \ 1107 "Trace run-time calls") \ 1108 \ 1109 develop(bool, TraceJNICalls, false, \ 1110 "Trace JNI calls") \ 1111 \ 1112 notproduct(bool, TraceJVMCalls, false, \ 1113 "Trace JVM calls") \ 1114 \ 1115 product(ccstr, TraceJVMTI, NULL, \ 1116 "Trace flags for JVMTI functions and events") \ 1117 \ 1118 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1119 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1120 \ 1121 /* This option can change an EMCP method into an obsolete method. */ \ 1122 /* This can affect tests that except specific methods to be EMCP. */ \ 1123 /* This option should be used with caution. */ \ 1124 product(bool, StressLdcRewrite, false, \ 1125 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1126 \ 1127 product(intx, TraceRedefineClasses, 0, \ 1128 "Trace level for JVMTI RedefineClasses") \ 1129 \ 1130 develop(bool, StressMethodComparator, false, \ 1131 "run the MethodComparator on all loaded methods") \ 1132 \ 1133 /* change to false by default sometime after Mustang */ \ 1134 product(bool, VerifyMergedCPBytecodes, true, \ 1135 "Verify bytecodes after RedefineClasses constant pool merging") \ 1136 \ 1137 develop(bool, TraceJNIHandleAllocation, false, \ 1138 "Trace allocation/deallocation of JNI handle blocks") \ 1139 \ 1140 develop(bool, TraceThreadEvents, false, \ 1141 "Trace all thread events") \ 1142 \ 1143 develop(bool, TraceBytecodes, false, \ 1144 "Trace bytecode execution") \ 1145 \ 1146 develop(bool, TraceClassInitialization, false, \ 1147 "Trace class initialization") \ 1148 \ 1149 develop(bool, TraceExceptions, false, \ 1150 "Trace exceptions") \ 1151 \ 1152 develop(bool, TraceICs, false, \ 1153 "Trace inline cache changes") \ 1154 \ 1155 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1156 "Trace method invocation counter overflow") \ 1157 \ 1158 develop(bool, TraceInlineCacheClearing, false, \ 1159 "Trace clearing of inline caches in nmethods") \ 1160 \ 1161 develop(bool, TraceDependencies, false, \ 1162 "Trace dependencies") \ 1163 \ 1164 develop(bool, VerifyDependencies, trueInDebug, \ 1165 "Exercise and verify the compilation dependency mechanism") \ 1166 \ 1167 develop(bool, TraceNewOopMapGeneration, false, \ 1168 "Trace OopMapGeneration") \ 1169 \ 1170 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1171 "Trace OopMapGeneration: print detailed cell states") \ 1172 \ 1173 develop(bool, TimeOopMap, false, \ 1174 "Time calls to GenerateOopMap::compute_map() in sum") \ 1175 \ 1176 develop(bool, TimeOopMap2, false, \ 1177 "Time calls to GenerateOopMap::compute_map() individually") \ 1178 \ 1179 develop(bool, TraceMonitorMismatch, false, \ 1180 "Trace monitor matching failures during OopMapGeneration") \ 1181 \ 1182 develop(bool, TraceOopMapRewrites, false, \ 1183 "Trace rewritting of method oops during oop map generation") \ 1184 \ 1185 develop(bool, TraceSafepoint, false, \ 1186 "Trace safepoint operations") \ 1187 \ 1188 develop(bool, TraceICBuffer, false, \ 1189 "Trace usage of IC buffer") \ 1190 \ 1191 develop(bool, TraceCompiledIC, false, \ 1192 "Trace changes of compiled IC") \ 1193 \ 1194 notproduct(bool, TraceZapDeadLocals, false, \ 1195 "Trace zapping dead locals") \ 1196 \ 1197 develop(bool, TraceStartupTime, false, \ 1198 "Trace setup time") \ 1199 \ 1200 develop(bool, TraceHPI, false, \ 1201 "Trace Host Porting Interface (HPI)") \ 1202 \ 1203 product(ccstr, HPILibPath, NULL, \ 1204 "Specify alternate path to HPI library") \ 1205 \ 1206 develop(bool, TraceProtectionDomainVerification, false, \ 1207 "Trace protection domain verifcation") \ 1208 \ 1209 develop(bool, TraceClearedExceptions, false, \ 1210 "Prints when an exception is forcibly cleared") \ 1211 \ 1212 product(bool, TraceClassResolution, false, \ 1213 "Trace all constant pool resolutions (for debugging)") \ 1214 \ 1215 product(bool, TraceBiasedLocking, false, \ 1216 "Trace biased locking in JVM") \ 1217 \ 1218 product(bool, TraceMonitorInflation, false, \ 1219 "Trace monitor inflation in JVM") \ 1220 \ 1221 /* assembler */ \ 1222 product(bool, Use486InstrsOnly, false, \ 1223 "Use 80486 Compliant instruction subset") \ 1224 \ 1225 /* gc */ \ 1226 \ 1227 product(bool, UseSerialGC, false, \ 1228 "Use the serial garbage collector") \ 1229 \ 1230 product(bool, UseG1GC, false, \ 1231 "Use the Garbage-First garbage collector") \ 1232 \ 1233 product(bool, UseParallelGC, false, \ 1234 "Use the Parallel Scavenge garbage collector") \ 1235 \ 1236 product(bool, UseParallelOldGC, false, \ 1237 "Use the Parallel Old garbage collector") \ 1238 \ 1239 product(bool, UseParallelOldGCCompacting, true, \ 1240 "In the Parallel Old garbage collector use parallel compaction") \ 1241 \ 1242 product(bool, UseParallelDensePrefixUpdate, true, \ 1243 "In the Parallel Old garbage collector use parallel dense" \ 1244 " prefix update") \ 1245 \ 1246 product(uintx, HeapMaximumCompactionInterval, 20, \ 1247 "How often should we maximally compact the heap (not allowing " \ 1248 "any dead space)") \ 1249 \ 1250 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1251 "The collection count for the first maximum compaction") \ 1252 \ 1253 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1254 "In the Parallel Old garbage collector maximum compaction for " \ 1255 "a system GC") \ 1256 \ 1257 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1258 "The mean used by the par compact dead wood" \ 1259 "limiter (a number between 0-100).") \ 1260 \ 1261 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1262 "The standard deviation used by the par compact dead wood" \ 1263 "limiter (a number between 0-100).") \ 1264 \ 1265 product(bool, UseParallelOldGCDensePrefix, true, \ 1266 "Use a dense prefix with the Parallel Old garbage collector") \ 1267 \ 1268 product(uintx, ParallelGCThreads, 0, \ 1269 "Number of parallel threads parallel gc will use") \ 1270 \ 1271 develop(bool, ParallelOldGCSplitALot, false, \ 1272 "Provoke splitting (copying data from a young gen space to" \ 1273 "multiple destination spaces)") \ 1274 \ 1275 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1276 "How often to provoke splitting a young gen space") \ 1277 \ 1278 develop(bool, TraceRegionTasksQueuing, false, \ 1279 "Trace the queuing of the region tasks") \ 1280 \ 1281 product(uintx, ConcGCThreads, 0, \ 1282 "Number of threads concurrent gc will use") \ 1283 \ 1284 product(uintx, YoungPLABSize, 4096, \ 1285 "Size of young gen promotion labs (in HeapWords)") \ 1286 \ 1287 product(uintx, OldPLABSize, 1024, \ 1288 "Size of old gen promotion labs (in HeapWords)") \ 1289 \ 1290 product(uintx, GCTaskTimeStampEntries, 200, \ 1291 "Number of time stamp entries per gc worker thread") \ 1292 \ 1293 product(bool, AlwaysTenure, false, \ 1294 "Always tenure objects in eden. (ParallelGC only)") \ 1295 \ 1296 product(bool, NeverTenure, false, \ 1297 "Never tenure objects in eden, May tenure on overflow " \ 1298 "(ParallelGC only)") \ 1299 \ 1300 product(bool, ScavengeBeforeFullGC, true, \ 1301 "Scavenge youngest generation before each full GC, " \ 1302 "used with UseParallelGC") \ 1303 \ 1304 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1305 "Allow scavenges to occur when to_space contains objects.") \ 1306 \ 1307 product(bool, UseConcMarkSweepGC, false, \ 1308 "Use Concurrent Mark-Sweep GC in the old generation") \ 1309 \ 1310 product(bool, ExplicitGCInvokesConcurrent, false, \ 1311 "A System.gc() request invokes a concurrent collection;" \ 1312 " (effective only when UseConcMarkSweepGC)") \ 1313 \ 1314 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1315 "A System.gc() request invokes a concurrent collection and " \ 1316 "also unloads classes during such a concurrent gc cycle " \ 1317 "(effective only when UseConcMarkSweepGC)") \ 1318 \ 1319 product(bool, GCLockerInvokesConcurrent, false, \ 1320 "The exit of a JNI CS necessitating a scavenge also" \ 1321 " kicks off a bkgrd concurrent collection") \ 1322 \ 1323 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1324 "Use Adaptive Free Lists in the CMS generation") \ 1325 \ 1326 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1327 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1328 \ 1329 develop(bool, RotateCMSCollectionTypes, false, \ 1330 "Rotate the CMS collections among concurrent and STW") \ 1331 \ 1332 product(bool, UseCMSBestFit, true, \ 1333 "Use CMS best fit allocation strategy") \ 1334 \ 1335 product(bool, UseCMSCollectionPassing, true, \ 1336 "Use passing of collection from background to foreground") \ 1337 \ 1338 product(bool, UseParNewGC, false, \ 1339 "Use parallel threads in the new generation.") \ 1340 \ 1341 product(bool, ParallelGCVerbose, false, \ 1342 "Verbose output for parallel GC.") \ 1343 \ 1344 product(intx, ParallelGCBufferWastePct, 10, \ 1345 "wasted fraction of parallel allocation buffer.") \ 1346 \ 1347 product(bool, ParallelGCRetainPLAB, true, \ 1348 "Retain parallel allocation buffers across scavenges.") \ 1349 \ 1350 product(intx, TargetPLABWastePct, 10, \ 1351 "target wasted space in last buffer as pct of overall allocation")\ 1352 \ 1353 product(uintx, PLABWeight, 75, \ 1354 "Percentage (0-100) used to weight the current sample when" \ 1355 "computing exponentially decaying average for ResizePLAB.") \ 1356 \ 1357 product(bool, ResizePLAB, true, \ 1358 "Dynamically resize (survivor space) promotion labs") \ 1359 \ 1360 product(bool, PrintPLAB, false, \ 1361 "Print (survivor space) promotion labs sizing decisions") \ 1362 \ 1363 product(intx, ParGCArrayScanChunk, 50, \ 1364 "Scan a subset and push remainder, if array is bigger than this") \ 1365 \ 1366 product(bool, ParGCUseLocalOverflow, false, \ 1367 "Instead of a global overflow list, use local overflow stacks") \ 1368 \ 1369 product(bool, ParGCTrimOverflow, true, \ 1370 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1371 \ 1372 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1373 "Whether we should simulate work queue overflow in ParNew") \ 1374 \ 1375 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1376 "An `interval' counter that determines how frequently " \ 1377 "we simulate overflow; a smaller number increases frequency") \ 1378 \ 1379 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1380 "The desired number of objects to claim from the overflow list") \ 1381 \ 1382 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1383 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1384 "parallel GC.") \ 1385 \ 1386 product(uintx, OldPLABWeight, 50, \ 1387 "Percentage (0-100) used to weight the current sample when" \ 1388 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1389 \ 1390 product(bool, ResizeOldPLAB, true, \ 1391 "Dynamically resize (old gen) promotion labs") \ 1392 \ 1393 product(bool, PrintOldPLAB, false, \ 1394 "Print (old gen) promotion labs sizing decisions") \ 1395 \ 1396 product(uintx, CMSOldPLABMin, 16, \ 1397 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1398 \ 1399 product(uintx, CMSOldPLABMax, 1024, \ 1400 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1401 \ 1402 product(uintx, CMSOldPLABNumRefills, 4, \ 1403 "Nominal number of refills of CMS gen promotion lab cache" \ 1404 " per worker per block size") \ 1405 \ 1406 product(bool, CMSOldPLABResizeQuicker, false, \ 1407 "Whether to react on-the-fly during a scavenge to a sudden" \ 1408 " change in block demand rate") \ 1409 \ 1410 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1411 "The tolerance of the phase-change detector for on-the-fly" \ 1412 " PLAB resizing during a scavenge") \ 1413 \ 1414 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1415 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1416 " during a scavenge") \ 1417 \ 1418 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1419 "The clamping of the gain in the feedback loop for on-the-fly" \ 1420 " PLAB resizing during a scavenge") \ 1421 \ 1422 product(bool, AlwaysPreTouch, false, \ 1423 "It forces all freshly committed pages to be pre-touched.") \ 1424 \ 1425 product(bool, CMSUseOldDefaults, false, \ 1426 "A flag temporarily introduced to allow reverting to some " \ 1427 "older default settings; older as of 6.0") \ 1428 \ 1429 product(intx, CMSYoungGenPerWorker, 16*M, \ 1430 "The amount of young gen chosen by default per GC worker " \ 1431 "thread available") \ 1432 \ 1433 product(bool, GCOverheadReporting, false, \ 1434 "Enables the GC overhead reporting facility") \ 1435 \ 1436 product(intx, GCOverheadReportingPeriodMS, 100, \ 1437 "Reporting period for conc GC overhead reporting, in ms ") \ 1438 \ 1439 product(bool, CMSIncrementalMode, false, \ 1440 "Whether CMS GC should operate in \"incremental\" mode") \ 1441 \ 1442 product(uintx, CMSIncrementalDutyCycle, 10, \ 1443 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1444 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1445 "value") \ 1446 \ 1447 product(bool, CMSIncrementalPacing, true, \ 1448 "Whether the CMS incremental mode duty cycle should be " \ 1449 "automatically adjusted") \ 1450 \ 1451 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1452 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1453 "enabled (a percentage, 0-100)") \ 1454 \ 1455 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1456 "Percentage (0-100) used to add conservatism when computing the " \ 1457 "duty cycle") \ 1458 \ 1459 product(uintx, CMSIncrementalOffset, 0, \ 1460 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1461 " is shifted to the right within the period between young GCs") \ 1462 \ 1463 product(uintx, CMSExpAvgFactor, 50, \ 1464 "Percentage (0-100) used to weight the current sample when" \ 1465 "computing exponential averages for CMS statistics.") \ 1466 \ 1467 product(uintx, CMS_FLSWeight, 75, \ 1468 "Percentage (0-100) used to weight the current sample when" \ 1469 "computing exponentially decating averages for CMS FLS statistics.") \ 1470 \ 1471 product(uintx, CMS_FLSPadding, 1, \ 1472 "The multiple of deviation from mean to use for buffering" \ 1473 "against volatility in free list demand.") \ 1474 \ 1475 product(uintx, FLSCoalescePolicy, 2, \ 1476 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1477 \ 1478 product(bool, FLSAlwaysCoalesceLarge, false, \ 1479 "CMS: Larger free blocks are always available for coalescing") \ 1480 \ 1481 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1482 "CMS: the smaller the percentage the greater the coalition force")\ 1483 \ 1484 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1485 "CMS: the factor by which to inflate estimated demand of small" \ 1486 " block sizes to prevent coalescing with an adjoining block") \ 1487 \ 1488 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1489 "CMS: the factor by which to inflate estimated demand of large" \ 1490 " block sizes to prevent coalescing with an adjoining block") \ 1491 \ 1492 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1493 "CMS: the factor by which to inflate estimated demand of small" \ 1494 " block sizes to prevent splitting to supply demand for smaller" \ 1495 " blocks") \ 1496 \ 1497 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1498 "CMS: the factor by which to inflate estimated demand of large" \ 1499 " block sizes to prevent splitting to supply demand for smaller" \ 1500 " blocks") \ 1501 \ 1502 product(bool, CMSExtrapolateSweep, false, \ 1503 "CMS: cushion for block demand during sweep") \ 1504 \ 1505 product(uintx, CMS_SweepWeight, 75, \ 1506 "Percentage (0-100) used to weight the current sample when " \ 1507 "computing exponentially decaying average for inter-sweep " \ 1508 "duration") \ 1509 \ 1510 product(uintx, CMS_SweepPadding, 1, \ 1511 "The multiple of deviation from mean to use for buffering " \ 1512 "against volatility in inter-sweep duration.") \ 1513 \ 1514 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1515 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1516 "duration exceeds this threhold in milliseconds") \ 1517 \ 1518 develop(bool, CMSTraceIncrementalMode, false, \ 1519 "Trace CMS incremental mode") \ 1520 \ 1521 develop(bool, CMSTraceIncrementalPacing, false, \ 1522 "Trace CMS incremental mode pacing computation") \ 1523 \ 1524 develop(bool, CMSTraceThreadState, false, \ 1525 "Trace the CMS thread state (enable the trace_state() method)") \ 1526 \ 1527 product(bool, CMSClassUnloadingEnabled, false, \ 1528 "Whether class unloading enabled when using CMS GC") \ 1529 \ 1530 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1531 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1532 " for which classes may not be unloaded") \ 1533 \ 1534 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1535 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1536 \ 1537 product(bool, UseCMSCompactAtFullCollection, true, \ 1538 "Use mark sweep compact at full collections") \ 1539 \ 1540 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1541 "Number of CMS full collection done before compaction if > 0") \ 1542 \ 1543 develop(intx, CMSDictionaryChoice, 0, \ 1544 "Use BinaryTreeDictionary as default in the CMS generation") \ 1545 \ 1546 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1547 "Replenish an indexed free list with this number of chunks") \ 1548 \ 1549 product(bool, CMSReplenishIntermediate, true, \ 1550 "Replenish all intermediate free-list caches") \ 1551 \ 1552 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1553 "When satisfying batched demand, split blocks from the " \ 1554 "IndexedFreeList whose size is a multiple of requested size") \ 1555 \ 1556 product(bool, CMSLoopWarn, false, \ 1557 "Warn in case of excessive CMS looping") \ 1558 \ 1559 develop(bool, CMSOverflowEarlyRestoration, false, \ 1560 "Whether preserved marks should be restored early") \ 1561 \ 1562 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1563 "Size of marking stack") \ 1564 \ 1565 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1566 "Max size of marking stack") \ 1567 \ 1568 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1569 "Whether we should simulate frequent marking stack / work queue" \ 1570 " overflow") \ 1571 \ 1572 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1573 "An `interval' counter that determines how frequently" \ 1574 " we simulate overflow; a smaller number increases frequency") \ 1575 \ 1576 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1577 "(Temporary, subject to experimentation)" \ 1578 "Maximum number of abortable preclean iterations, if > 0") \ 1579 \ 1580 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1581 "(Temporary, subject to experimentation)" \ 1582 "Maximum time in abortable preclean in ms") \ 1583 \ 1584 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1585 "(Temporary, subject to experimentation)" \ 1586 "Nominal minimum work per abortable preclean iteration") \ 1587 \ 1588 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1589 "(Temporary, subject to experimentation)" \ 1590 " Time that we sleep between iterations when not given" \ 1591 " enough work per iteration") \ 1592 \ 1593 product(uintx, CMSRescanMultiple, 32, \ 1594 "Size (in cards) of CMS parallel rescan task") \ 1595 \ 1596 product(uintx, CMSConcMarkMultiple, 32, \ 1597 "Size (in cards) of CMS concurrent MT marking task") \ 1598 \ 1599 product(uintx, CMSRevisitStackSize, 1*M, \ 1600 "Size of CMS KlassKlass revisit stack") \ 1601 \ 1602 product(bool, CMSAbortSemantics, false, \ 1603 "Whether abort-on-overflow semantics is implemented") \ 1604 \ 1605 product(bool, CMSParallelRemarkEnabled, true, \ 1606 "Whether parallel remark enabled (only if ParNewGC)") \ 1607 \ 1608 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1609 "Whether parallel remark of survivor space" \ 1610 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1611 \ 1612 product(bool, CMSPLABRecordAlways, true, \ 1613 "Whether to always record survivor space PLAB bdries" \ 1614 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1615 \ 1616 product(bool, CMSConcurrentMTEnabled, true, \ 1617 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1618 \ 1619 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1620 "Whether concurrent precleaning enabled in perm gen" \ 1621 " (effective only when CMSPrecleaningEnabled is true)") \ 1622 \ 1623 product(bool, CMSPrecleaningEnabled, true, \ 1624 "Whether concurrent precleaning enabled") \ 1625 \ 1626 product(uintx, CMSPrecleanIter, 3, \ 1627 "Maximum number of precleaning iteration passes") \ 1628 \ 1629 product(uintx, CMSPrecleanNumerator, 2, \ 1630 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1631 " ratio") \ 1632 \ 1633 product(uintx, CMSPrecleanDenominator, 3, \ 1634 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1635 " ratio") \ 1636 \ 1637 product(bool, CMSPrecleanRefLists1, true, \ 1638 "Preclean ref lists during (initial) preclean phase") \ 1639 \ 1640 product(bool, CMSPrecleanRefLists2, false, \ 1641 "Preclean ref lists during abortable preclean phase") \ 1642 \ 1643 product(bool, CMSPrecleanSurvivors1, false, \ 1644 "Preclean survivors during (initial) preclean phase") \ 1645 \ 1646 product(bool, CMSPrecleanSurvivors2, true, \ 1647 "Preclean survivors during abortable preclean phase") \ 1648 \ 1649 product(uintx, CMSPrecleanThreshold, 1000, \ 1650 "Don't re-iterate if #dirty cards less than this") \ 1651 \ 1652 product(bool, CMSCleanOnEnter, true, \ 1653 "Clean-on-enter optimization for reducing number of dirty cards") \ 1654 \ 1655 product(uintx, CMSRemarkVerifyVariant, 1, \ 1656 "Choose variant (1,2) of verification following remark") \ 1657 \ 1658 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1659 "If Eden used is below this value, don't try to schedule remark") \ 1660 \ 1661 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1662 "The Eden occupancy % at which to try and schedule remark pause") \ 1663 \ 1664 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1665 "Start sampling Eden top at least before yg occupancy reaches" \ 1666 " 1/<ratio> of the size at which we plan to schedule remark") \ 1667 \ 1668 product(uintx, CMSSamplingGrain, 16*K, \ 1669 "The minimum distance between eden samples for CMS (see above)") \ 1670 \ 1671 product(bool, CMSScavengeBeforeRemark, false, \ 1672 "Attempt scavenge before the CMS remark step") \ 1673 \ 1674 develop(bool, CMSTraceSweeper, false, \ 1675 "Trace some actions of the CMS sweeper") \ 1676 \ 1677 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1678 "Don't drain below this size per parallel worker/thief") \ 1679 \ 1680 manageable(intx, CMSWaitDuration, 2000, \ 1681 "Time in milliseconds that CMS thread waits for young GC") \ 1682 \ 1683 product(bool, CMSYield, true, \ 1684 "Yield between steps of concurrent mark & sweep") \ 1685 \ 1686 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1687 "Bitmap operations should process at most this many bits" \ 1688 "between yields") \ 1689 \ 1690 product(bool, CMSDumpAtPromotionFailure, false, \ 1691 "Dump useful information about the state of the CMS old " \ 1692 " generation upon a promotion failure.") \ 1693 \ 1694 product(bool, CMSPrintChunksInDump, false, \ 1695 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1696 " more detailed information about the free chunks.") \ 1697 \ 1698 product(bool, CMSPrintObjectsInDump, false, \ 1699 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1700 " more detailed information about the allocated objects.") \ 1701 \ 1702 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1703 "Verify that all refs across the FLS boundary " \ 1704 " are to valid objects") \ 1705 \ 1706 diagnostic(bool, FLSVerifyLists, false, \ 1707 "Do lots of (expensive) FreeListSpace verification") \ 1708 \ 1709 diagnostic(bool, FLSVerifyIndexTable, false, \ 1710 "Do lots of (expensive) FLS index table verification") \ 1711 \ 1712 develop(bool, FLSVerifyDictionary, false, \ 1713 "Do lots of (expensive) FLS dictionary verification") \ 1714 \ 1715 develop(bool, VerifyBlockOffsetArray, false, \ 1716 "Do (expensive!) block offset array verification") \ 1717 \ 1718 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1719 "Maintain _unallocated_block in BlockOffsetArray" \ 1720 " (currently applicable only to CMS collector)") \ 1721 \ 1722 develop(bool, TraceCMSState, false, \ 1723 "Trace the state of the CMS collection") \ 1724 \ 1725 product(intx, RefDiscoveryPolicy, 0, \ 1726 "Whether reference-based(0) or referent-based(1)") \ 1727 \ 1728 product(bool, ParallelRefProcEnabled, false, \ 1729 "Enable parallel reference processing whenever possible") \ 1730 \ 1731 product(bool, ParallelRefProcBalancingEnabled, true, \ 1732 "Enable balancing of reference processing queues") \ 1733 \ 1734 product(intx, CMSTriggerRatio, 80, \ 1735 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1736 "allocated before a CMS collection cycle commences") \ 1737 \ 1738 product(intx, CMSTriggerPermRatio, 80, \ 1739 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1740 "is allocated before a CMS collection cycle commences, that " \ 1741 "also collects the perm generation") \ 1742 \ 1743 product(uintx, CMSBootstrapOccupancy, 50, \ 1744 "Percentage CMS generation occupancy at which to " \ 1745 "initiate CMS collection for bootstrapping collection stats") \ 1746 \ 1747 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1748 "Percentage CMS generation occupancy to start a CMS collection " \ 1749 "cycle. A negative value means that CMSTriggerRatio is used") \ 1750 \ 1751 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1752 "Percentage of the (entire) heap occupancy to start a " \ 1753 "concurrent GC cycle. It us used by GCs that trigger a " \ 1754 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1755 "not just one of the generations (e.g., G1). A value of 0 " \ 1756 "denotes 'do constant GC cycles'.") \ 1757 \ 1758 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1759 "Percentage CMS perm generation occupancy to start a " \ 1760 "CMScollection cycle. A negative value means that " \ 1761 "CMSTriggerPermRatio is used") \ 1762 \ 1763 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1764 "Only use occupancy as a crierion for starting a CMS collection") \ 1765 \ 1766 product(intx, CMSIsTooFullPercentage, 98, \ 1767 "An absolute ceiling above which CMS will always consider the " \ 1768 "perm gen ripe for collection") \ 1769 \ 1770 develop(bool, CMSTestInFreeList, false, \ 1771 "Check if the coalesced range is already in the " \ 1772 "free lists as claimed") \ 1773 \ 1774 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1775 "Check that all the garbage collected was returned to the " \ 1776 "free lists.") \ 1777 \ 1778 notproduct(bool, ScavengeALot, false, \ 1779 "Force scavenge at every Nth exit from the runtime system " \ 1780 "(N=ScavengeALotInterval)") \ 1781 \ 1782 develop(bool, FullGCALot, false, \ 1783 "Force full gc at every Nth exit from the runtime system " \ 1784 "(N=FullGCALotInterval)") \ 1785 \ 1786 notproduct(bool, GCALotAtAllSafepoints, false, \ 1787 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1788 \ 1789 product(bool, HandlePromotionFailure, true, \ 1790 "The youngest generation collection does not require " \ 1791 "a guarantee of full promotion of all live objects.") \ 1792 \ 1793 product(bool, PrintPromotionFailure, false, \ 1794 "Print additional diagnostic information following " \ 1795 " promotion failure") \ 1796 \ 1797 notproduct(bool, PromotionFailureALot, false, \ 1798 "Use promotion failure handling on every youngest generation " \ 1799 "collection") \ 1800 \ 1801 develop(uintx, PromotionFailureALotCount, 1000, \ 1802 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1803 "refill attempts (ParNew) or promotion attempts " \ 1804 "(other young collectors) ") \ 1805 \ 1806 develop(uintx, PromotionFailureALotInterval, 5, \ 1807 "Total collections between promotion failures alot") \ 1808 \ 1809 experimental(intx, WorkStealingSleepMillis, 1, \ 1810 "Sleep time when sleep is used for yields") \ 1811 \ 1812 experimental(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1813 "Number of yields before a sleep is done during workstealing") \ 1814 \ 1815 experimental(uintx, WorkStealingHardSpins, 4096, \ 1816 "Number of iterations in a spin loop between checks on " \ 1817 "time out of hard spin") \ 1818 \ 1819 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1820 "Ratio of hard spins to calls to yield") \ 1821 \ 1822 product(uintx, PreserveMarkStackSize, 1024, \ 1823 "Size for stack used in promotion failure handling") \ 1824 \ 1825 develop(uintx, ObjArrayMarkingStride, 512, \ 1826 "Number of ObjArray elements to push onto the marking stack" \ 1827 "before pushing a continuation entry") \ 1828 \ 1829 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1830 \ 1831 product_pd(bool, ResizeTLAB, \ 1832 "Dynamically resize tlab size for threads") \ 1833 \ 1834 product(bool, ZeroTLAB, false, \ 1835 "Zero out the newly created TLAB") \ 1836 \ 1837 product(bool, FastTLABRefill, true, \ 1838 "Use fast TLAB refill code") \ 1839 \ 1840 product(bool, PrintTLAB, false, \ 1841 "Print various TLAB related information") \ 1842 \ 1843 product(bool, TLABStats, true, \ 1844 "Print various TLAB related information") \ 1845 \ 1846 product(bool, PrintRevisitStats, false, \ 1847 "Print revisit (klass and MDO) stack related information") \ 1848 \ 1849 product_pd(bool, NeverActAsServerClassMachine, \ 1850 "Never act like a server-class machine") \ 1851 \ 1852 product(bool, AlwaysActAsServerClassMachine, false, \ 1853 "Always act like a server-class machine") \ 1854 \ 1855 product_pd(uint64_t, MaxRAM, \ 1856 "Real memory size (in bytes) used to set maximum heap size") \ 1857 \ 1858 product(uintx, ErgoHeapSizeLimit, 0, \ 1859 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1860 "MaxRAM / MaxRAMFraction") \ 1861 \ 1862 product(uintx, MaxRAMFraction, 4, \ 1863 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1864 "size") \ 1865 \ 1866 product(uintx, DefaultMaxRAMFraction, 4, \ 1867 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1868 "size; deprecated: to be renamed to MaxRAMFraction") \ 1869 \ 1870 product(uintx, MinRAMFraction, 2, \ 1871 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1872 "size on systems with small physical memory size") \ 1873 \ 1874 product(uintx, InitialRAMFraction, 64, \ 1875 "Fraction (1/n) of real memory used for initial heap size") \ 1876 \ 1877 product(bool, UseAutoGCSelectPolicy, false, \ 1878 "Use automatic collection selection policy") \ 1879 \ 1880 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1881 "Automatic GC selection pause threshhold in ms") \ 1882 \ 1883 product(bool, UseAdaptiveSizePolicy, true, \ 1884 "Use adaptive generation sizing policies") \ 1885 \ 1886 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1887 "Use adaptive survivor sizing policies") \ 1888 \ 1889 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1890 "Use adaptive young-old sizing policies at minor collections") \ 1891 \ 1892 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1893 "Use adaptive young-old sizing policies at major collections") \ 1894 \ 1895 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1896 "Use statistics from System.GC for adaptive size policy") \ 1897 \ 1898 product(bool, UseAdaptiveGCBoundary, false, \ 1899 "Allow young-old boundary to move") \ 1900 \ 1901 develop(bool, TraceAdaptiveGCBoundary, false, \ 1902 "Trace young-old boundary moves") \ 1903 \ 1904 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1905 "Resize the virtual spaces of the young or old generations") \ 1906 \ 1907 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1908 "Policy for changeing generation size for throughput goals") \ 1909 \ 1910 product(uintx, AdaptiveSizePausePolicy, 0, \ 1911 "Policy for changing generation size for pause goals") \ 1912 \ 1913 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1914 "Adjust tenured generation to achive a minor pause goal") \ 1915 \ 1916 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1917 "Adjust young generation to achive a major pause goal") \ 1918 \ 1919 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1920 "Number of steps where heuristics is used before data is used") \ 1921 \ 1922 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1923 "Number of collections before the adaptive sizing is started") \ 1924 \ 1925 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1926 "Collecton interval for printing information; zero => never") \ 1927 \ 1928 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1929 "Use adaptive minimum footprint as a goal") \ 1930 \ 1931 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1932 "Weight given to exponential resizing, between 0 and 100") \ 1933 \ 1934 product(uintx, AdaptiveTimeWeight, 25, \ 1935 "Weight given to time in adaptive policy, between 0 and 100") \ 1936 \ 1937 product(uintx, PausePadding, 1, \ 1938 "How much buffer to keep for pause time") \ 1939 \ 1940 product(uintx, PromotedPadding, 3, \ 1941 "How much buffer to keep for promotion failure") \ 1942 \ 1943 product(uintx, SurvivorPadding, 3, \ 1944 "How much buffer to keep for survivor overflow") \ 1945 \ 1946 product(uintx, AdaptivePermSizeWeight, 20, \ 1947 "Weight for perm gen exponential resizing, between 0 and 100") \ 1948 \ 1949 product(uintx, PermGenPadding, 3, \ 1950 "How much buffer to keep for perm gen sizing") \ 1951 \ 1952 product(uintx, ThresholdTolerance, 10, \ 1953 "Allowed collection cost difference between generations") \ 1954 \ 1955 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1956 "If collection costs are within margin, reduce both by full " \ 1957 "delta") \ 1958 \ 1959 product(uintx, YoungGenerationSizeIncrement, 20, \ 1960 "Adaptive size percentage change in young generation") \ 1961 \ 1962 product(uintx, YoungGenerationSizeSupplement, 80, \ 1963 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1964 \ 1965 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1966 "Decay factor to YoungedGenerationSizeSupplement") \ 1967 \ 1968 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1969 "Adaptive size percentage change in tenured generation") \ 1970 \ 1971 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1972 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1973 \ 1974 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1975 "Decay factor to TenuredGenerationSizeIncrement") \ 1976 \ 1977 product(uintx, MaxGCPauseMillis, max_uintx, \ 1978 "Adaptive size policy maximum GC pause time goal in msec, " \ 1979 "or (G1 Only) the max. GC time per MMU time slice") \ 1980 \ 1981 product(uintx, GCPauseIntervalMillis, 0, \ 1982 "Time slice for MMU specification") \ 1983 \ 1984 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1985 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1986 \ 1987 product(uintx, GCTimeRatio, 99, \ 1988 "Adaptive size policy application time to GC time ratio") \ 1989 \ 1990 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1991 "Adaptive size scale down factor for shrinking") \ 1992 \ 1993 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1994 "Adaptive size decays the major cost for long major intervals") \ 1995 \ 1996 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1997 "Time scale over which major costs decay") \ 1998 \ 1999 product(uintx, MinSurvivorRatio, 3, \ 2000 "Minimum ratio of young generation/survivor space size") \ 2001 \ 2002 product(uintx, InitialSurvivorRatio, 8, \ 2003 "Initial ratio of eden/survivor space size") \ 2004 \ 2005 product(uintx, BaseFootPrintEstimate, 256*M, \ 2006 "Estimate of footprint other than Java Heap") \ 2007 \ 2008 product(bool, UseGCOverheadLimit, true, \ 2009 "Use policy to limit of proportion of time spent in GC " \ 2010 "before an OutOfMemory error is thrown") \ 2011 \ 2012 product(uintx, GCTimeLimit, 98, \ 2013 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2014 "error is thrown (used with GCHeapFreeLimit)") \ 2015 \ 2016 product(uintx, GCHeapFreeLimit, 2, \ 2017 "Minimum percentage of free space after a full GC before an " \ 2018 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2019 \ 2020 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2021 "Number of consecutive collections before gc time limit fires") \ 2022 \ 2023 product(bool, PrintAdaptiveSizePolicy, false, \ 2024 "Print information about AdaptiveSizePolicy") \ 2025 \ 2026 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2027 "How far ahead to prefetch destination area (<= 0 means off)") \ 2028 \ 2029 product(intx, PrefetchScanIntervalInBytes, -1, \ 2030 "How far ahead to prefetch scan area (<= 0 means off)") \ 2031 \ 2032 product(intx, PrefetchFieldsAhead, -1, \ 2033 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2034 \ 2035 develop(bool, UsePrefetchQueue, true, \ 2036 "Use the prefetch queue during PS promotion") \ 2037 \ 2038 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2039 "Verify system before exiting") \ 2040 \ 2041 diagnostic(bool, VerifyBeforeGC, false, \ 2042 "Verify memory system before GC") \ 2043 \ 2044 diagnostic(bool, VerifyAfterGC, false, \ 2045 "Verify memory system after GC") \ 2046 \ 2047 diagnostic(bool, VerifyDuringGC, false, \ 2048 "Verify memory system during GC (between phases)") \ 2049 \ 2050 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2051 "Enable parallel memory system verification") \ 2052 \ 2053 diagnostic(bool, DeferInitialCardMark, false, \ 2054 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2055 "may arise from new_pre_store_barrier") \ 2056 \ 2057 diagnostic(bool, VerifyRememberedSets, false, \ 2058 "Verify GC remembered sets") \ 2059 \ 2060 diagnostic(bool, VerifyObjectStartArray, true, \ 2061 "Verify GC object start array if verify before/after") \ 2062 \ 2063 product(bool, DisableExplicitGC, false, \ 2064 "Tells whether calling System.gc() does a full GC") \ 2065 \ 2066 notproduct(bool, CheckMemoryInitialization, false, \ 2067 "Checks memory initialization") \ 2068 \ 2069 product(bool, CollectGen0First, false, \ 2070 "Collect youngest generation before each full GC") \ 2071 \ 2072 diagnostic(bool, BindCMSThreadToCPU, false, \ 2073 "Bind CMS Thread to CPU if possible") \ 2074 \ 2075 diagnostic(uintx, CPUForCMSThread, 0, \ 2076 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2077 \ 2078 product(bool, BindGCTaskThreadsToCPUs, false, \ 2079 "Bind GCTaskThreads to CPUs if possible") \ 2080 \ 2081 product(bool, UseGCTaskAffinity, false, \ 2082 "Use worker affinity when asking for GCTasks") \ 2083 \ 2084 product(uintx, ProcessDistributionStride, 4, \ 2085 "Stride through processors when distributing processes") \ 2086 \ 2087 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2088 "number of times the coordinator GC thread will sleep while " \ 2089 "yielding before giving up and resuming GC") \ 2090 \ 2091 product(uintx, CMSYieldSleepCount, 0, \ 2092 "number of times a GC thread (minus the coordinator) " \ 2093 "will sleep while yielding before giving up and resuming GC") \ 2094 \ 2095 /* gc tracing */ \ 2096 manageable(bool, PrintGC, false, \ 2097 "Print message at garbage collect") \ 2098 \ 2099 manageable(bool, PrintGCDetails, false, \ 2100 "Print more details at garbage collect") \ 2101 \ 2102 manageable(bool, PrintGCDateStamps, false, \ 2103 "Print date stamps at garbage collect") \ 2104 \ 2105 manageable(bool, PrintGCTimeStamps, false, \ 2106 "Print timestamps at garbage collect") \ 2107 \ 2108 product(bool, PrintGCTaskTimeStamps, false, \ 2109 "Print timestamps for individual gc worker thread tasks") \ 2110 \ 2111 develop(intx, ConcGCYieldTimeout, 0, \ 2112 "If non-zero, assert that GC threads yield within this # of ms.") \ 2113 \ 2114 notproduct(bool, TraceMarkSweep, false, \ 2115 "Trace mark sweep") \ 2116 \ 2117 product(bool, PrintReferenceGC, false, \ 2118 "Print times spent handling reference objects during GC " \ 2119 " (enabled only when PrintGCDetails)") \ 2120 \ 2121 develop(bool, TraceReferenceGC, false, \ 2122 "Trace handling of soft/weak/final/phantom references") \ 2123 \ 2124 develop(bool, TraceFinalizerRegistration, false, \ 2125 "Trace registration of final references") \ 2126 \ 2127 notproduct(bool, TraceScavenge, false, \ 2128 "Trace scavenge") \ 2129 \ 2130 product_rw(bool, TraceClassLoading, false, \ 2131 "Trace all classes loaded") \ 2132 \ 2133 product(bool, TraceClassLoadingPreorder, false, \ 2134 "Trace all classes loaded in order referenced (not loaded)") \ 2135 \ 2136 product_rw(bool, TraceClassUnloading, false, \ 2137 "Trace unloading of classes") \ 2138 \ 2139 product_rw(bool, TraceLoaderConstraints, false, \ 2140 "Trace loader constraints") \ 2141 \ 2142 product(bool, TraceGen0Time, false, \ 2143 "Trace accumulated time for Gen 0 collection") \ 2144 \ 2145 product(bool, TraceGen1Time, false, \ 2146 "Trace accumulated time for Gen 1 collection") \ 2147 \ 2148 product(bool, PrintTenuringDistribution, false, \ 2149 "Print tenuring age information") \ 2150 \ 2151 product_rw(bool, PrintHeapAtGC, false, \ 2152 "Print heap layout before and after each GC") \ 2153 \ 2154 product_rw(bool, PrintHeapAtGCExtended, false, \ 2155 "Prints extended information about the layout of the heap " \ 2156 "when -XX:+PrintHeapAtGC is set") \ 2157 \ 2158 product(bool, PrintHeapAtSIGBREAK, true, \ 2159 "Print heap layout in response to SIGBREAK") \ 2160 \ 2161 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2162 "Print a class histogram before any major stop-world GC") \ 2163 \ 2164 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2165 "Print a class histogram after any major stop-world GC") \ 2166 \ 2167 manageable(bool, PrintClassHistogram, false, \ 2168 "Print a histogram of class instances") \ 2169 \ 2170 develop(bool, TraceWorkGang, false, \ 2171 "Trace activities of work gangs") \ 2172 \ 2173 product(bool, TraceParallelOldGCTasks, false, \ 2174 "Trace multithreaded GC activity") \ 2175 \ 2176 develop(bool, TraceBlockOffsetTable, false, \ 2177 "Print BlockOffsetTable maps") \ 2178 \ 2179 develop(bool, TraceCardTableModRefBS, false, \ 2180 "Print CardTableModRefBS maps") \ 2181 \ 2182 develop(bool, TraceGCTaskManager, false, \ 2183 "Trace actions of the GC task manager") \ 2184 \ 2185 develop(bool, TraceGCTaskQueue, false, \ 2186 "Trace actions of the GC task queues") \ 2187 \ 2188 develop(bool, TraceGCTaskThread, false, \ 2189 "Trace actions of the GC task threads") \ 2190 \ 2191 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2192 "Print the time taken by each parallel old gc phase." \ 2193 "PrintGCDetails must also be enabled.") \ 2194 \ 2195 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2196 "Trace parallel old gc marking phase") \ 2197 \ 2198 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2199 "Trace parallel old gc summary phase") \ 2200 \ 2201 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2202 "Trace parallel old gc compaction phase") \ 2203 \ 2204 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2205 "Trace parallel old gc dense prefix computation") \ 2206 \ 2207 develop(bool, IgnoreLibthreadGPFault, false, \ 2208 "Suppress workaround for libthread GP fault") \ 2209 \ 2210 product(bool, PrintJNIGCStalls, false, \ 2211 "Print diagnostic message when GC is stalled" \ 2212 "by JNI critical section") \ 2213 \ 2214 /* JVMTI heap profiling */ \ 2215 \ 2216 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2217 "Trace JVMTI object tagging calls") \ 2218 \ 2219 diagnostic(bool, VerifyBeforeIteration, false, \ 2220 "Verify memory system before JVMTI iteration") \ 2221 \ 2222 /* compiler interface */ \ 2223 \ 2224 develop(bool, CIPrintCompilerName, false, \ 2225 "when CIPrint is active, print the name of the active compiler") \ 2226 \ 2227 develop(bool, CIPrintCompileQueue, false, \ 2228 "display the contents of the compile queue whenever a " \ 2229 "compilation is enqueued") \ 2230 \ 2231 develop(bool, CIPrintRequests, false, \ 2232 "display every request for compilation") \ 2233 \ 2234 product(bool, CITime, false, \ 2235 "collect timing information for compilation") \ 2236 \ 2237 develop(bool, CITimeEach, false, \ 2238 "display timing information after each successful compilation") \ 2239 \ 2240 develop(bool, CICountOSR, true, \ 2241 "use a separate counter when assigning ids to osr compilations") \ 2242 \ 2243 develop(bool, CICompileNatives, true, \ 2244 "compile native methods if supported by the compiler") \ 2245 \ 2246 develop_pd(bool, CICompileOSR, \ 2247 "compile on stack replacement methods if supported by the " \ 2248 "compiler") \ 2249 \ 2250 develop(bool, CIPrintMethodCodes, false, \ 2251 "print method bytecodes of the compiled code") \ 2252 \ 2253 develop(bool, CIPrintTypeFlow, false, \ 2254 "print the results of ciTypeFlow analysis") \ 2255 \ 2256 develop(bool, CITraceTypeFlow, false, \ 2257 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2258 \ 2259 develop(intx, CICloneLoopTestLimit, 100, \ 2260 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2261 \ 2262 /* temp diagnostics */ \ 2263 \ 2264 diagnostic(bool, TraceRedundantCompiles, false, \ 2265 "Have compile broker print when a request already in the queue is"\ 2266 " requested again") \ 2267 \ 2268 diagnostic(bool, InitialCompileFast, false, \ 2269 "Initial compile at CompLevel_fast_compile") \ 2270 \ 2271 diagnostic(bool, InitialCompileReallyFast, false, \ 2272 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2273 \ 2274 diagnostic(bool, FullProfileOnReInterpret, true, \ 2275 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2276 \ 2277 /* compiler */ \ 2278 \ 2279 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2280 "Number of compiler threads to run") \ 2281 \ 2282 product(intx, CompilationPolicyChoice, 0, \ 2283 "which compilation policy (0/1)") \ 2284 \ 2285 develop(bool, UseStackBanging, true, \ 2286 "use stack banging for stack overflow checks (required for " \ 2287 "proper StackOverflow handling; disable only to measure cost " \ 2288 "of stackbanging)") \ 2289 \ 2290 develop(bool, Use24BitFPMode, true, \ 2291 "Set 24-bit FPU mode on a per-compile basis ") \ 2292 \ 2293 develop(bool, Use24BitFP, true, \ 2294 "use FP instructions that produce 24-bit precise results") \ 2295 \ 2296 develop(bool, UseStrictFP, true, \ 2297 "use strict fp if modifier strictfp is set") \ 2298 \ 2299 develop(bool, GenerateSynchronizationCode, true, \ 2300 "generate locking/unlocking code for synchronized methods and " \ 2301 "monitors") \ 2302 \ 2303 develop(bool, GenerateCompilerNullChecks, true, \ 2304 "Generate explicit null checks for loads/stores/calls") \ 2305 \ 2306 develop(bool, GenerateRangeChecks, true, \ 2307 "Generate range checks for array accesses") \ 2308 \ 2309 develop_pd(bool, ImplicitNullChecks, \ 2310 "generate code for implicit null checks") \ 2311 \ 2312 product(bool, PrintSafepointStatistics, false, \ 2313 "print statistics about safepoint synchronization") \ 2314 \ 2315 product(intx, PrintSafepointStatisticsCount, 300, \ 2316 "total number of safepoint statistics collected " \ 2317 "before printing them out") \ 2318 \ 2319 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2320 "print safepoint statistics only when safepoint takes" \ 2321 " more than PrintSafepointSatisticsTimeout in millis") \ 2322 \ 2323 product(bool, TraceSafepointCleanupTime, false, \ 2324 "print the break down of clean up tasks performed during" \ 2325 " safepoint") \ 2326 \ 2327 develop(bool, InlineAccessors, true, \ 2328 "inline accessor methods (get/set)") \ 2329 \ 2330 product(bool, Inline, true, \ 2331 "enable inlining") \ 2332 \ 2333 product(bool, ClipInlining, true, \ 2334 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2335 \ 2336 develop(bool, UseCHA, true, \ 2337 "enable CHA") \ 2338 \ 2339 product(bool, UseTypeProfile, true, \ 2340 "Check interpreter profile for historically monomorphic calls") \ 2341 \ 2342 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2343 "% of major receiver type to all profiled receivers") \ 2344 \ 2345 notproduct(bool, TimeCompiler, false, \ 2346 "time the compiler") \ 2347 \ 2348 notproduct(bool, TimeCompiler2, false, \ 2349 "detailed time the compiler (requires +TimeCompiler)") \ 2350 \ 2351 diagnostic(bool, PrintInlining, false, \ 2352 "prints inlining optimizations") \ 2353 \ 2354 diagnostic(bool, PrintIntrinsics, false, \ 2355 "prints attempted and successful inlining of intrinsics") \ 2356 \ 2357 product(bool, UseCountLeadingZerosInstruction, false, \ 2358 "Use count leading zeros instruction") \ 2359 \ 2360 product(bool, UsePopCountInstruction, false, \ 2361 "Use population count instruction") \ 2362 \ 2363 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2364 "do not expand intrinsics whose (internal) names appear here") \ 2365 \ 2366 develop(bool, StressReflectiveCode, false, \ 2367 "Use inexact types at allocations, etc., to test reflection") \ 2368 \ 2369 develop(bool, EagerInitialization, false, \ 2370 "Eagerly initialize classes if possible") \ 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 notproduct(bool, PrintFlagsWithComments, false, \ 2410 "Print all VM flags with default values and descriptions and exit")\ 2411 \ 2412 diagnostic(bool, SerializeVMOutput, true, \ 2413 "Use a mutex to serialize output to tty and hotspot.log") \ 2414 \ 2415 diagnostic(bool, DisplayVMOutput, true, \ 2416 "Display all VM output on the tty, independently of LogVMOutput") \ 2417 \ 2418 diagnostic(bool, LogVMOutput, trueInDebug, \ 2419 "Save VM output to hotspot.log, or to LogFile") \ 2420 \ 2421 diagnostic(ccstr, LogFile, NULL, \ 2422 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2423 \ 2424 product(ccstr, ErrorFile, NULL, \ 2425 "If an error occurs, save the error data to this file " \ 2426 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2427 \ 2428 product(bool, DisplayVMOutputToStderr, false, \ 2429 "If DisplayVMOutput is true, display all VM output to stderr") \ 2430 \ 2431 product(bool, DisplayVMOutputToStdout, false, \ 2432 "If DisplayVMOutput is true, display all VM output to stdout") \ 2433 \ 2434 product(bool, UseHeavyMonitors, false, \ 2435 "use heavyweight instead of lightweight Java monitors") \ 2436 \ 2437 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2438 "print histogram of the symbol table") \ 2439 \ 2440 notproduct(bool, ExitVMOnVerifyError, false, \ 2441 "standard exit from VM if bytecode verify error " \ 2442 "(only in debug mode)") \ 2443 \ 2444 notproduct(ccstr, AbortVMOnException, NULL, \ 2445 "Call fatal if this exception is thrown. Example: " \ 2446 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2447 \ 2448 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2449 "Call fatal if the exception pointed by AbortVMOnException " \ 2450 "has this message.") \ 2451 \ 2452 develop(bool, DebugVtables, false, \ 2453 "add debugging code to vtable dispatch") \ 2454 \ 2455 develop(bool, PrintVtables, false, \ 2456 "print vtables when printing klass") \ 2457 \ 2458 notproduct(bool, PrintVtableStats, false, \ 2459 "print vtables stats at end of run") \ 2460 \ 2461 develop(bool, TraceCreateZombies, false, \ 2462 "trace creation of zombie nmethods") \ 2463 \ 2464 notproduct(bool, IgnoreLockingAssertions, false, \ 2465 "disable locking assertions (for speed)") \ 2466 \ 2467 notproduct(bool, VerifyLoopOptimizations, false, \ 2468 "verify major loop optimizations") \ 2469 \ 2470 product(bool, RangeCheckElimination, true, \ 2471 "Split loop iterations to eliminate range checks") \ 2472 \ 2473 develop_pd(bool, UncommonNullCast, \ 2474 "track occurrences of null in casts; adjust compiler tactics") \ 2475 \ 2476 develop(bool, TypeProfileCasts, true, \ 2477 "treat casts like calls for purposes of type profiling") \ 2478 \ 2479 develop(bool, MonomorphicArrayCheck, true, \ 2480 "Uncommon-trap array store checks that require full type check") \ 2481 \ 2482 diagnostic(bool, ProfileDynamicTypes, true, \ 2483 "do extra type profiling and use it more aggressively") \ 2484 \ 2485 develop(bool, DelayCompilationDuringStartup, true, \ 2486 "Delay invoking the compiler until main application class is " \ 2487 "loaded") \ 2488 \ 2489 develop(bool, CompileTheWorld, false, \ 2490 "Compile all methods in all classes in bootstrap class path " \ 2491 "(stress test)") \ 2492 \ 2493 develop(bool, CompileTheWorldPreloadClasses, true, \ 2494 "Preload all classes used by a class before start loading") \ 2495 \ 2496 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2497 "Compile all methods although class initializer failed") \ 2498 \ 2499 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2500 "Force a safepoint every n compiles so sweeper can keep up") \ 2501 \ 2502 develop(bool, TraceIterativeGVN, false, \ 2503 "Print progress during Iterative Global Value Numbering") \ 2504 \ 2505 develop(bool, FillDelaySlots, true, \ 2506 "Fill delay slots (on SPARC only)") \ 2507 \ 2508 develop(bool, VerifyIterativeGVN, false, \ 2509 "Verify Def-Use modifications during sparse Iterative Global " \ 2510 "Value Numbering") \ 2511 \ 2512 notproduct(bool, TracePhaseCCP, false, \ 2513 "Print progress during Conditional Constant Propagation") \ 2514 \ 2515 develop(bool, TimeLivenessAnalysis, false, \ 2516 "Time computation of bytecode liveness analysis") \ 2517 \ 2518 develop(bool, TraceLivenessGen, false, \ 2519 "Trace the generation of liveness analysis information") \ 2520 \ 2521 notproduct(bool, TraceLivenessQuery, false, \ 2522 "Trace queries of liveness analysis information") \ 2523 \ 2524 notproduct(bool, CollectIndexSetStatistics, false, \ 2525 "Collect information about IndexSets") \ 2526 \ 2527 develop(bool, PrintDominators, false, \ 2528 "Print out dominator trees for GVN") \ 2529 \ 2530 develop(bool, UseLoopSafepoints, true, \ 2531 "Generate Safepoint nodes in every loop") \ 2532 \ 2533 notproduct(bool, TraceCISCSpill, false, \ 2534 "Trace allocators use of cisc spillable instructions") \ 2535 \ 2536 notproduct(bool, TraceSpilling, false, \ 2537 "Trace spilling") \ 2538 \ 2539 product(bool, SplitIfBlocks, true, \ 2540 "Clone compares and control flow through merge points to fold " \ 2541 "some branches") \ 2542 \ 2543 develop(intx, FastAllocateSizeLimit, 128*K, \ 2544 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2545 "Inline allocations larger than this in doublewords must go slow")\ 2546 \ 2547 product(bool, AggressiveOpts, false, \ 2548 "Enable aggressive optimizations - see arguments.cpp") \ 2549 \ 2550 product(bool, UseStringCache, false, \ 2551 "Enable String cache capabilities on String.java") \ 2552 \ 2553 /* statistics */ \ 2554 develop(bool, CountCompiledCalls, false, \ 2555 "counts method invocations") \ 2556 \ 2557 notproduct(bool, CountRuntimeCalls, false, \ 2558 "counts VM runtime calls") \ 2559 \ 2560 develop(bool, CountJNICalls, false, \ 2561 "counts jni method invocations") \ 2562 \ 2563 notproduct(bool, CountJVMCalls, false, \ 2564 "counts jvm method invocations") \ 2565 \ 2566 notproduct(bool, CountRemovableExceptions, false, \ 2567 "count exceptions that could be replaced by branches due to " \ 2568 "inlining") \ 2569 \ 2570 notproduct(bool, ICMissHistogram, false, \ 2571 "produce histogram of IC misses") \ 2572 \ 2573 notproduct(bool, PrintClassStatistics, false, \ 2574 "prints class statistics at end of run") \ 2575 \ 2576 notproduct(bool, PrintMethodStatistics, false, \ 2577 "prints method statistics at end of run") \ 2578 \ 2579 /* interpreter */ \ 2580 develop(bool, ClearInterpreterLocals, false, \ 2581 "Always clear local variables of interpreter activations upon " \ 2582 "entry") \ 2583 \ 2584 product_pd(bool, RewriteBytecodes, \ 2585 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2586 \ 2587 product_pd(bool, RewriteFrequentPairs, \ 2588 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2589 \ 2590 diagnostic(bool, PrintInterpreter, false, \ 2591 "Prints the generated interpreter code") \ 2592 \ 2593 product(bool, UseInterpreter, true, \ 2594 "Use interpreter for non-compiled methods") \ 2595 \ 2596 develop(bool, UseFastSignatureHandlers, true, \ 2597 "Use fast signature handlers for native calls") \ 2598 \ 2599 develop(bool, UseV8InstrsOnly, false, \ 2600 "Use SPARC-V8 Compliant instruction subset") \ 2601 \ 2602 product(bool, UseNiagaraInstrs, false, \ 2603 "Use Niagara-efficient instruction subset") \ 2604 \ 2605 develop(bool, UseCASForSwap, false, \ 2606 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2607 \ 2608 product(bool, UseLoopCounter, true, \ 2609 "Increment invocation counter on backward branch") \ 2610 \ 2611 product(bool, UseFastEmptyMethods, true, \ 2612 "Use fast method entry code for empty methods") \ 2613 \ 2614 product(bool, UseFastAccessorMethods, true, \ 2615 "Use fast method entry code for accessor methods") \ 2616 \ 2617 product_pd(bool, UseOnStackReplacement, \ 2618 "Use on stack replacement, calls runtime if invoc. counter " \ 2619 "overflows in loop") \ 2620 \ 2621 notproduct(bool, TraceOnStackReplacement, false, \ 2622 "Trace on stack replacement") \ 2623 \ 2624 develop(bool, PoisonOSREntry, true, \ 2625 "Detect abnormal calls to OSR code") \ 2626 \ 2627 product_pd(bool, PreferInterpreterNativeStubs, \ 2628 "Use always interpreter stubs for native methods invoked via " \ 2629 "interpreter") \ 2630 \ 2631 develop(bool, CountBytecodes, false, \ 2632 "Count number of bytecodes executed") \ 2633 \ 2634 develop(bool, PrintBytecodeHistogram, false, \ 2635 "Print histogram of the executed bytecodes") \ 2636 \ 2637 develop(bool, PrintBytecodePairHistogram, false, \ 2638 "Print histogram of the executed bytecode pairs") \ 2639 \ 2640 diagnostic(bool, PrintSignatureHandlers, false, \ 2641 "Print code generated for native method signature handlers") \ 2642 \ 2643 develop(bool, VerifyOops, false, \ 2644 "Do plausibility checks for oops") \ 2645 \ 2646 develop(bool, CheckUnhandledOops, false, \ 2647 "Check for unhandled oops in VM code") \ 2648 \ 2649 develop(bool, VerifyJNIFields, trueInDebug, \ 2650 "Verify jfieldIDs for instance fields") \ 2651 \ 2652 notproduct(bool, VerifyJNIEnvThread, false, \ 2653 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2654 "from JNI") \ 2655 \ 2656 develop(bool, VerifyFPU, false, \ 2657 "Verify FPU state (check for NaN's, etc.)") \ 2658 \ 2659 develop(bool, VerifyThread, false, \ 2660 "Watch the thread register for corruption (SPARC only)") \ 2661 \ 2662 develop(bool, VerifyActivationFrameSize, false, \ 2663 "Verify that activation frame didn't become smaller than its " \ 2664 "minimal size") \ 2665 \ 2666 develop(bool, TraceFrequencyInlining, false, \ 2667 "Trace frequency based inlining") \ 2668 \ 2669 notproduct(bool, TraceTypeProfile, false, \ 2670 "Trace type profile") \ 2671 \ 2672 develop_pd(bool, InlineIntrinsics, \ 2673 "Inline intrinsics that can be statically resolved") \ 2674 \ 2675 product_pd(bool, ProfileInterpreter, \ 2676 "Profile at the bytecode level during interpretation") \ 2677 \ 2678 develop_pd(bool, ProfileTraps, \ 2679 "Profile deoptimization traps at the bytecode level") \ 2680 \ 2681 product(intx, ProfileMaturityPercentage, 20, \ 2682 "number of method invocations/branches (expressed as % of " \ 2683 "CompileThreshold) before using the method's profile") \ 2684 \ 2685 develop(bool, PrintMethodData, false, \ 2686 "Print the results of +ProfileInterpreter at end of run") \ 2687 \ 2688 develop(bool, VerifyDataPointer, trueInDebug, \ 2689 "Verify the method data pointer during interpreter profiling") \ 2690 \ 2691 develop(bool, VerifyCompiledCode, false, \ 2692 "Include miscellaneous runtime verifications in nmethod code; " \ 2693 "default off because it disturbs nmethod size heuristics") \ 2694 \ 2695 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2696 "Manually make GC thread crash then dump java stack trace; " \ 2697 "Test only") \ 2698 \ 2699 /* compilation */ \ 2700 product(bool, UseCompiler, true, \ 2701 "use compilation") \ 2702 \ 2703 develop(bool, TraceCompilationPolicy, false, \ 2704 "Trace compilation policy") \ 2705 \ 2706 develop(bool, TimeCompilationPolicy, false, \ 2707 "Time the compilation policy") \ 2708 \ 2709 product(bool, UseCounterDecay, true, \ 2710 "adjust recompilation counters") \ 2711 \ 2712 develop(intx, CounterHalfLifeTime, 30, \ 2713 "half-life time of invocation counters (in secs)") \ 2714 \ 2715 develop(intx, CounterDecayMinIntervalLength, 500, \ 2716 "Min. ms. between invocation of CounterDecay") \ 2717 \ 2718 product(bool, AlwaysCompileLoopMethods, false, \ 2719 "when using recompilation, never interpret methods " \ 2720 "containing loops") \ 2721 \ 2722 product(bool, DontCompileHugeMethods, true, \ 2723 "don't compile methods > HugeMethodLimit") \ 2724 \ 2725 /* Bytecode escape analysis estimation. */ \ 2726 product(bool, EstimateArgEscape, true, \ 2727 "Analyze bytecodes to estimate escape state of arguments") \ 2728 \ 2729 product(intx, BCEATraceLevel, 0, \ 2730 "How much tracing to do of bytecode escape analysis estimates") \ 2731 \ 2732 product(intx, MaxBCEAEstimateLevel, 5, \ 2733 "Maximum number of nested calls that are analyzed by BC EA.") \ 2734 \ 2735 product(intx, MaxBCEAEstimateSize, 150, \ 2736 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2737 \ 2738 product(intx, AllocatePrefetchStyle, 1, \ 2739 "0 = no prefetch, " \ 2740 "1 = prefetch instructions for each allocation, " \ 2741 "2 = use TLAB watermark to gate allocation prefetch, " \ 2742 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2743 \ 2744 product(intx, AllocatePrefetchDistance, -1, \ 2745 "Distance to prefetch ahead of allocation pointer") \ 2746 \ 2747 product(intx, AllocatePrefetchLines, 1, \ 2748 "Number of lines to prefetch ahead of allocation pointer") \ 2749 \ 2750 product(intx, AllocatePrefetchStepSize, 16, \ 2751 "Step size in bytes of sequential prefetch instructions") \ 2752 \ 2753 product(intx, AllocatePrefetchInstr, 0, \ 2754 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2755 \ 2756 product(intx, ReadPrefetchInstr, 0, \ 2757 "Prefetch instruction to prefetch ahead") \ 2758 \ 2759 /* deoptimization */ \ 2760 develop(bool, TraceDeoptimization, false, \ 2761 "Trace deoptimization") \ 2762 \ 2763 develop(bool, DebugDeoptimization, false, \ 2764 "Tracing various information while debugging deoptimization") \ 2765 \ 2766 product(intx, SelfDestructTimer, 0, \ 2767 "Will cause VM to terminate after a given time (in minutes) " \ 2768 "(0 means off)") \ 2769 \ 2770 product(intx, MaxJavaStackTraceDepth, 1024, \ 2771 "Max. no. of lines in the stack trace for Java exceptions " \ 2772 "(0 means all)") \ 2773 \ 2774 develop(intx, GuaranteedSafepointInterval, 1000, \ 2775 "Guarantee a safepoint (at least) every so many milliseconds " \ 2776 "(0 means none)") \ 2777 \ 2778 product(intx, SafepointTimeoutDelay, 10000, \ 2779 "Delay in milliseconds for option SafepointTimeout") \ 2780 \ 2781 product(intx, NmethodSweepFraction, 4, \ 2782 "Number of invocations of sweeper to cover all nmethods") \ 2783 \ 2784 product(intx, NmethodSweepCheckInterval, 5, \ 2785 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2786 \ 2787 notproduct(intx, MemProfilingInterval, 500, \ 2788 "Time between each invocation of the MemProfiler") \ 2789 \ 2790 develop(intx, MallocCatchPtr, -1, \ 2791 "Hit breakpoint when mallocing/freeing this pointer") \ 2792 \ 2793 notproduct(intx, AssertRepeat, 1, \ 2794 "number of times to evaluate expression in assert " \ 2795 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2796 \ 2797 notproduct(ccstrlist, SuppressErrorAt, "", \ 2798 "List of assertions (file:line) to muzzle") \ 2799 \ 2800 notproduct(uintx, HandleAllocationLimit, 1024, \ 2801 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2802 "is used") \ 2803 \ 2804 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2805 "Threshold for total handle allocation when " \ 2806 "+TraceHandleAllocation is used") \ 2807 \ 2808 develop(intx, StackPrintLimit, 100, \ 2809 "number of stack frames to print in VM-level stack dump") \ 2810 \ 2811 notproduct(intx, MaxElementPrintSize, 256, \ 2812 "maximum number of elements to print") \ 2813 \ 2814 notproduct(intx, MaxSubklassPrintSize, 4, \ 2815 "maximum number of subklasses to print when printing klass") \ 2816 \ 2817 product(intx, MaxInlineLevel, 9, \ 2818 "maximum number of nested calls that are inlined") \ 2819 \ 2820 product(intx, MaxRecursiveInlineLevel, 1, \ 2821 "maximum number of nested recursive calls that are inlined") \ 2822 \ 2823 product_pd(intx, InlineSmallCode, \ 2824 "Only inline already compiled methods if their code size is " \ 2825 "less than this") \ 2826 \ 2827 product(intx, MaxInlineSize, 35, \ 2828 "maximum bytecode size of a method to be inlined") \ 2829 \ 2830 product_pd(intx, FreqInlineSize, \ 2831 "maximum bytecode size of a frequent method to be inlined") \ 2832 \ 2833 product(intx, MaxTrivialSize, 6, \ 2834 "maximum bytecode size of a trivial method to be inlined") \ 2835 \ 2836 product(intx, MinInliningThreshold, 250, \ 2837 "min. invocation count a method needs to have to be inlined") \ 2838 \ 2839 develop(intx, AlignEntryCode, 4, \ 2840 "aligns entry code to specified value (in bytes)") \ 2841 \ 2842 develop(intx, MethodHistogramCutoff, 100, \ 2843 "cutoff value for method invoc. histogram (+CountCalls)") \ 2844 \ 2845 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2846 "# of interpreted methods to show in profile") \ 2847 \ 2848 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2849 "# of compiled methods to show in profile") \ 2850 \ 2851 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2852 "# of stub methods to show in profile") \ 2853 \ 2854 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2855 "# of runtime stub nodes to show in profile") \ 2856 \ 2857 product(intx, ProfileIntervalsTicks, 100, \ 2858 "# of ticks between printing of interval profile " \ 2859 "(+ProfileIntervals)") \ 2860 \ 2861 notproduct(intx, ScavengeALotInterval, 1, \ 2862 "Interval between which scavenge will occur with +ScavengeALot") \ 2863 \ 2864 notproduct(intx, FullGCALotInterval, 1, \ 2865 "Interval between which full gc will occur with +FullGCALot") \ 2866 \ 2867 notproduct(intx, FullGCALotStart, 0, \ 2868 "For which invocation to start FullGCAlot") \ 2869 \ 2870 notproduct(intx, FullGCALotDummies, 32*K, \ 2871 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2872 "to move") \ 2873 \ 2874 develop(intx, DontYieldALotInterval, 10, \ 2875 "Interval between which yields will be dropped (milliseconds)") \ 2876 \ 2877 develop(intx, MinSleepInterval, 1, \ 2878 "Minimum sleep() interval (milliseconds) when " \ 2879 "ConvertSleepToYield is off (used for SOLARIS)") \ 2880 \ 2881 product(intx, EventLogLength, 2000, \ 2882 "maximum nof events in event log") \ 2883 \ 2884 develop(intx, ProfilerPCTickThreshold, 15, \ 2885 "Number of ticks in a PC buckets to be a hotspot") \ 2886 \ 2887 notproduct(intx, DeoptimizeALotInterval, 5, \ 2888 "Number of exits until DeoptimizeALot kicks in") \ 2889 \ 2890 notproduct(intx, ZombieALotInterval, 5, \ 2891 "Number of exits until ZombieALot kicks in") \ 2892 \ 2893 develop(bool, StressNonEntrant, false, \ 2894 "Mark nmethods non-entrant at registration") \ 2895 \ 2896 diagnostic(intx, MallocVerifyInterval, 0, \ 2897 "if non-zero, verify C heap after every N calls to " \ 2898 "malloc/realloc/free") \ 2899 \ 2900 diagnostic(intx, MallocVerifyStart, 0, \ 2901 "if non-zero, start verifying C heap after Nth call to " \ 2902 "malloc/realloc/free") \ 2903 \ 2904 product(intx, TypeProfileWidth, 2, \ 2905 "number of receiver types to record in call/cast profile") \ 2906 \ 2907 develop(intx, BciProfileWidth, 2, \ 2908 "number of return bci's to record in ret profile") \ 2909 \ 2910 product(intx, PerMethodRecompilationCutoff, 400, \ 2911 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2912 \ 2913 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2914 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2915 \ 2916 product(intx, PerMethodTrapLimit, 100, \ 2917 "Limit on traps (of one kind) in a method (includes inlines)") \ 2918 \ 2919 product(intx, PerBytecodeTrapLimit, 4, \ 2920 "Limit on traps (of one kind) at a particular BCI") \ 2921 \ 2922 develop(intx, FreqCountInvocations, 1, \ 2923 "Scaling factor for branch frequencies (deprecated)") \ 2924 \ 2925 develop(intx, InlineFrequencyRatio, 20, \ 2926 "Ratio of call site execution to caller method invocation") \ 2927 \ 2928 develop_pd(intx, InlineFrequencyCount, \ 2929 "Count of call site execution necessary to trigger frequent " \ 2930 "inlining") \ 2931 \ 2932 develop(intx, InlineThrowCount, 50, \ 2933 "Force inlining of interpreted methods that throw this often") \ 2934 \ 2935 develop(intx, InlineThrowMaxSize, 200, \ 2936 "Force inlining of throwing methods smaller than this") \ 2937 \ 2938 product(intx, AliasLevel, 3, \ 2939 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2940 "2 for class split, 3 for unique instances") \ 2941 \ 2942 develop(bool, VerifyAliases, false, \ 2943 "perform extra checks on the results of alias analysis") \ 2944 \ 2945 develop(intx, ProfilerNodeSize, 1024, \ 2946 "Size in K to allocate for the Profile Nodes of each thread") \ 2947 \ 2948 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2949 "Number of times to spin wait on a v8 atomic operation lock") \ 2950 \ 2951 product(intx, ReadSpinIterations, 100, \ 2952 "Number of read attempts before a yield (spin inner loop)") \ 2953 \ 2954 product_pd(intx, PreInflateSpin, \ 2955 "Number of times to spin wait before inflation") \ 2956 \ 2957 product(intx, PreBlockSpin, 10, \ 2958 "Number of times to spin in an inflated lock before going to " \ 2959 "an OS lock") \ 2960 \ 2961 /* gc parameters */ \ 2962 product(uintx, InitialHeapSize, 0, \ 2963 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2964 \ 2965 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2966 "Maximum heap size (in bytes)") \ 2967 \ 2968 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2969 "Initial tenured generation size (in bytes)") \ 2970 \ 2971 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2972 "Initial new generation size (in bytes)") \ 2973 \ 2974 product(uintx, MaxNewSize, max_uintx, \ 2975 "Maximum new generation size (in bytes), max_uintx means set " \ 2976 "ergonomically") \ 2977 \ 2978 product(uintx, PretenureSizeThreshold, 0, \ 2979 "Maximum size in bytes of objects allocated in DefNew " \ 2980 "generation; zero means no maximum") \ 2981 \ 2982 product(uintx, TLABSize, 0, \ 2983 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2984 \ 2985 product(uintx, MinTLABSize, 2*K, \ 2986 "Minimum allowed TLAB size (in bytes)") \ 2987 \ 2988 product(uintx, TLABAllocationWeight, 35, \ 2989 "Allocation averaging weight") \ 2990 \ 2991 product(uintx, TLABWasteTargetPercent, 1, \ 2992 "Percentage of Eden that can be wasted") \ 2993 \ 2994 product(uintx, TLABRefillWasteFraction, 64, \ 2995 "Max TLAB waste at a refill (internal fragmentation)") \ 2996 \ 2997 product(uintx, TLABWasteIncrement, 4, \ 2998 "Increment allowed waste at slow allocation") \ 2999 \ 3000 product(intx, SurvivorRatio, 8, \ 3001 "Ratio of eden/survivor space size") \ 3002 \ 3003 product(intx, NewRatio, 2, \ 3004 "Ratio of new/old generation sizes") \ 3005 \ 3006 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 3007 "Max percent of eden objects that will be live at scavenge") \ 3008 \ 3009 product_pd(uintx, NewSizeThreadIncrease, \ 3010 "Additional size added to desired new generation size per " \ 3011 "non-daemon thread (in bytes)") \ 3012 \ 3013 product_pd(uintx, PermSize, \ 3014 "Initial size of permanent generation (in bytes)") \ 3015 \ 3016 product_pd(uintx, MaxPermSize, \ 3017 "Maximum size of permanent generation (in bytes)") \ 3018 \ 3019 product(uintx, MinHeapFreeRatio, 40, \ 3020 "Min percentage of heap free after GC to avoid expansion") \ 3021 \ 3022 product(uintx, MaxHeapFreeRatio, 70, \ 3023 "Max percentage of heap free after GC to avoid shrinking") \ 3024 \ 3025 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3026 "Number of milliseconds per MB of free space in the heap") \ 3027 \ 3028 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3029 "Min change in heap space due to GC (in bytes)") \ 3030 \ 3031 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3032 "Min expansion of permanent heap (in bytes)") \ 3033 \ 3034 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3035 "Max expansion of permanent heap without full GC (in bytes)") \ 3036 \ 3037 product(intx, QueuedAllocationWarningCount, 0, \ 3038 "Number of times an allocation that queues behind a GC " \ 3039 "will retry before printing a warning") \ 3040 \ 3041 diagnostic(uintx, VerifyGCStartAt, 0, \ 3042 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3043 \ 3044 diagnostic(intx, VerifyGCLevel, 0, \ 3045 "Generation level at which to start +VerifyBefore/AfterGC") \ 3046 \ 3047 develop(uintx, ExitAfterGCNum, 0, \ 3048 "If non-zero, exit after this GC.") \ 3049 \ 3050 product(intx, MaxTenuringThreshold, 15, \ 3051 "Maximum value for tenuring threshold") \ 3052 \ 3053 product(intx, InitialTenuringThreshold, 7, \ 3054 "Initial value for tenuring threshold") \ 3055 \ 3056 product(intx, TargetSurvivorRatio, 50, \ 3057 "Desired percentage of survivor space used after scavenge") \ 3058 \ 3059 product(uintx, MarkSweepDeadRatio, 5, \ 3060 "Percentage (0-100) of the old gen allowed as dead wood." \ 3061 "Serial mark sweep treats this as both the min and max value." \ 3062 "CMS uses this value only if it falls back to mark sweep." \ 3063 "Par compact uses a variable scale based on the density of the" \ 3064 "generation and treats this as the max value when the heap is" \ 3065 "either completely full or completely empty. Par compact also" \ 3066 "has a smaller default value; see arguments.cpp.") \ 3067 \ 3068 product(uintx, PermMarkSweepDeadRatio, 20, \ 3069 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3070 "See MarkSweepDeadRatio for collector-specific comments.") \ 3071 \ 3072 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3073 "How often should we fully compact the heap (ignoring the dead " \ 3074 "space parameters)") \ 3075 \ 3076 product(intx, PrintCMSStatistics, 0, \ 3077 "Statistics for CMS") \ 3078 \ 3079 product(bool, PrintCMSInitiationStatistics, false, \ 3080 "Statistics for initiating a CMS collection") \ 3081 \ 3082 product(intx, PrintFLSStatistics, 0, \ 3083 "Statistics for CMS' FreeListSpace") \ 3084 \ 3085 product(intx, PrintFLSCensus, 0, \ 3086 "Census for CMS' FreeListSpace") \ 3087 \ 3088 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3089 "Delay in ms between expansion and allocation") \ 3090 \ 3091 product(intx, DeferThrSuspendLoopCount, 4000, \ 3092 "(Unstable) Number of times to iterate in safepoint loop " \ 3093 " before blocking VM threads ") \ 3094 \ 3095 product(intx, DeferPollingPageLoopCount, -1, \ 3096 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3097 "before changing safepoint polling page to RO ") \ 3098 \ 3099 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3100 \ 3101 product(bool, PSChunkLargeArrays, true, \ 3102 "true: process large arrays in chunks") \ 3103 \ 3104 product(uintx, GCDrainStackTargetSize, 64, \ 3105 "how many entries we'll try to leave on the stack during " \ 3106 "parallel GC") \ 3107 \ 3108 /* stack parameters */ \ 3109 product_pd(intx, StackYellowPages, \ 3110 "Number of yellow zone (recoverable overflows) pages") \ 3111 \ 3112 product_pd(intx, StackRedPages, \ 3113 "Number of red zone (unrecoverable overflows) pages") \ 3114 \ 3115 product_pd(intx, StackShadowPages, \ 3116 "Number of shadow zone (for overflow checking) pages" \ 3117 " this should exceed the depth of the VM and native call stack") \ 3118 \ 3119 product_pd(intx, ThreadStackSize, \ 3120 "Thread Stack Size (in Kbytes)") \ 3121 \ 3122 product_pd(intx, VMThreadStackSize, \ 3123 "Non-Java Thread Stack Size (in Kbytes)") \ 3124 \ 3125 product_pd(intx, CompilerThreadStackSize, \ 3126 "Compiler Thread Stack Size (in Kbytes)") \ 3127 \ 3128 develop_pd(uintx, JVMInvokeMethodSlack, \ 3129 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3130 \ 3131 product(uintx, ThreadSafetyMargin, 50*M, \ 3132 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3133 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3134 "disable this feature") \ 3135 \ 3136 /* code cache parameters */ \ 3137 develop(uintx, CodeCacheSegmentSize, 64, \ 3138 "Code cache segment size (in bytes) - smallest unit of " \ 3139 "allocation") \ 3140 \ 3141 develop_pd(intx, CodeEntryAlignment, \ 3142 "Code entry alignment for generated code (in bytes)") \ 3143 \ 3144 product_pd(intx, OptoLoopAlignment, \ 3145 "Align inner loops to zero relative to this modulus") \ 3146 \ 3147 product_pd(uintx, InitialCodeCacheSize, \ 3148 "Initial code cache size (in bytes)") \ 3149 \ 3150 product_pd(uintx, ReservedCodeCacheSize, \ 3151 "Reserved code cache size (in bytes) - maximum code cache size") \ 3152 \ 3153 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3154 "When less than X space left, we stop compiling.") \ 3155 \ 3156 product_pd(uintx, CodeCacheExpansionSize, \ 3157 "Code cache expansion size (in bytes)") \ 3158 \ 3159 develop_pd(uintx, CodeCacheMinBlockLength, \ 3160 "Minimum number of segments in a code cache block.") \ 3161 \ 3162 notproduct(bool, ExitOnFullCodeCache, false, \ 3163 "Exit the VM if we fill the code cache.") \ 3164 \ 3165 product(bool, UseCodeCacheFlushing, false, \ 3166 "Attempt to clean the code cache before shutting off compiler") \ 3167 \ 3168 product(intx, MinCodeCacheFlushingInterval, 30, \ 3169 "Min number of seconds between code cache cleaning sessions") \ 3170 \ 3171 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3172 "When less than X space left, start code cache cleaning") \ 3173 \ 3174 /* interpreter debugging */ \ 3175 develop(intx, BinarySwitchThreshold, 5, \ 3176 "Minimal number of lookupswitch entries for rewriting to binary " \ 3177 "switch") \ 3178 \ 3179 develop(intx, StopInterpreterAt, 0, \ 3180 "Stops interpreter execution at specified bytecode number") \ 3181 \ 3182 develop(intx, TraceBytecodesAt, 0, \ 3183 "Traces bytecodes starting with specified bytecode number") \ 3184 \ 3185 /* compiler interface */ \ 3186 develop(intx, CIStart, 0, \ 3187 "the id of the first compilation to permit") \ 3188 \ 3189 develop(intx, CIStop, -1, \ 3190 "the id of the last compilation to permit") \ 3191 \ 3192 develop(intx, CIStartOSR, 0, \ 3193 "the id of the first osr compilation to permit " \ 3194 "(CICountOSR must be on)") \ 3195 \ 3196 develop(intx, CIStopOSR, -1, \ 3197 "the id of the last osr compilation to permit " \ 3198 "(CICountOSR must be on)") \ 3199 \ 3200 develop(intx, CIBreakAtOSR, -1, \ 3201 "id of osr compilation to break at") \ 3202 \ 3203 develop(intx, CIBreakAt, -1, \ 3204 "id of compilation to break at") \ 3205 \ 3206 product(ccstrlist, CompileOnly, "", \ 3207 "List of methods (pkg/class.name) to restrict compilation to") \ 3208 \ 3209 product(ccstr, CompileCommandFile, NULL, \ 3210 "Read compiler commands from this file [.hotspot_compiler]") \ 3211 \ 3212 product(ccstrlist, CompileCommand, "", \ 3213 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3214 \ 3215 product(bool, CICompilerCountPerCPU, false, \ 3216 "1 compiler thread for log(N CPUs)") \ 3217 \ 3218 develop(intx, CIFireOOMAt, -1, \ 3219 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3220 "(non-negative value throws OOM after this many CI accesses " \ 3221 "in each compile)") \ 3222 \ 3223 develop(intx, CIFireOOMAtDelay, -1, \ 3224 "Wait for this many CI accesses to occur in all compiles before " \ 3225 "beginning to throw OutOfMemoryErrors in each compile") \ 3226 \ 3227 notproduct(bool, CIObjectFactoryVerify, false, \ 3228 "enable potentially expensive verification in ciObjectFactory") \ 3229 \ 3230 /* Priorities */ \ 3231 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3232 \ 3233 product(intx, ThreadPriorityPolicy, 0, \ 3234 "0 : Normal. "\ 3235 " VM chooses priorities that are appropriate for normal "\ 3236 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3237 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3238 " map to lower native priority values. On Windows applications"\ 3239 " are allowed to use higher native priorities. However, with "\ 3240 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3241 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3242 " interfere with system threads. On Linux thread priorities "\ 3243 " are ignored because the OS does not support static priority "\ 3244 " in SCHED_OTHER scheduling class which is the only choice for"\ 3245 " non-root, non-realtime applications. "\ 3246 "1 : Aggressive. "\ 3247 " Java thread priorities map over to the entire range of "\ 3248 " native thread priorities. Higher Java thread priorities map "\ 3249 " to higher native thread priorities. This policy should be "\ 3250 " used with care, as sometimes it can cause performance "\ 3251 " degradation in the application and/or the entire system. On "\ 3252 " Linux this policy requires root privilege.") \ 3253 \ 3254 product(bool, ThreadPriorityVerbose, false, \ 3255 "print priority changes") \ 3256 \ 3257 product(intx, DefaultThreadPriority, -1, \ 3258 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3259 \ 3260 product(intx, CompilerThreadPriority, -1, \ 3261 "what priority should compiler threads run at (-1 means no change)") \ 3262 \ 3263 product(intx, VMThreadPriority, -1, \ 3264 "what priority should VM threads run at (-1 means no change)") \ 3265 \ 3266 product(bool, CompilerThreadHintNoPreempt, true, \ 3267 "(Solaris only) Give compiler threads an extra quanta") \ 3268 \ 3269 product(bool, VMThreadHintNoPreempt, false, \ 3270 "(Solaris only) Give VM thread an extra quanta") \ 3271 \ 3272 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3273 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3274 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3275 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3276 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3277 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3278 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3279 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3280 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3281 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3282 \ 3283 /* compiler debugging */ \ 3284 notproduct(intx, CompileTheWorldStartAt, 1, \ 3285 "First class to consider when using +CompileTheWorld") \ 3286 \ 3287 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3288 "Last class to consider when using +CompileTheWorld") \ 3289 \ 3290 develop(intx, NewCodeParameter, 0, \ 3291 "Testing Only: Create a dedicated integer parameter before " \ 3292 "putback") \ 3293 \ 3294 /* new oopmap storage allocation */ \ 3295 develop(intx, MinOopMapAllocation, 8, \ 3296 "Minimum number of OopMap entries in an OopMapSet") \ 3297 \ 3298 /* Background Compilation */ \ 3299 develop(intx, LongCompileThreshold, 50, \ 3300 "Used with +TraceLongCompiles") \ 3301 \ 3302 product(intx, StarvationMonitorInterval, 200, \ 3303 "Pause between each check in ms") \ 3304 \ 3305 /* recompilation */ \ 3306 product_pd(intx, CompileThreshold, \ 3307 "number of interpreted method invocations before (re-)compiling") \ 3308 \ 3309 product_pd(intx, BackEdgeThreshold, \ 3310 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3311 \ 3312 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3313 "Interpreter (tier 0) invocation notification frequency.") \ 3314 \ 3315 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3316 "C1 without MDO (tier 2) invocation notification frequency.") \ 3317 \ 3318 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3319 "C1 with MDO profiling (tier 3) invocation notification " \ 3320 "frequency.") \ 3321 \ 3322 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3323 "Interpreter (tier 0) invocation notification frequency.") \ 3324 \ 3325 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3326 "C1 without MDO (tier 2) invocation notification frequency.") \ 3327 \ 3328 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3329 "C1 with MDO profiling (tier 3) invocation notification " \ 3330 "frequency.") \ 3331 \ 3332 product(intx, Tier2CompileThreshold, 0, \ 3333 "threshold at which tier 2 compilation is invoked") \ 3334 \ 3335 product(intx, Tier2BackEdgeThreshold, 0, \ 3336 "Back edge threshold at which tier 2 compilation is invoked") \ 3337 \ 3338 product(intx, Tier3InvocationThreshold, 200, \ 3339 "Compile if number of method invocations crosses this " \ 3340 "threshold") \ 3341 \ 3342 product(intx, Tier3MinInvocationThreshold, 100, \ 3343 "Minimum invocation to compile at tier 3") \ 3344 \ 3345 product(intx, Tier3CompileThreshold, 2000, \ 3346 "Threshold at which tier 3 compilation is invoked (invocation " \ 3347 "minimum must be satisfied.") \ 3348 \ 3349 product(intx, Tier3BackEdgeThreshold, 7000, \ 3350 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3351 \ 3352 product(intx, Tier4InvocationThreshold, 5000, \ 3353 "Compile if number of method invocations crosses this " \ 3354 "threshold") \ 3355 \ 3356 product(intx, Tier4MinInvocationThreshold, 600, \ 3357 "Minimum invocation to compile at tier 4") \ 3358 \ 3359 product(intx, Tier4CompileThreshold, 15000, \ 3360 "Threshold at which tier 4 compilation is invoked (invocation " \ 3361 "minimum must be satisfied.") \ 3362 \ 3363 product(intx, Tier4BackEdgeThreshold, 40000, \ 3364 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3365 \ 3366 product(intx, Tier3DelayOn, 5, \ 3367 "If C2 queue size grows over this amount per compiler thread " \ 3368 "stop compiling at tier 3 and start compiling at tier 2") \ 3369 \ 3370 product(intx, Tier3DelayOff, 2, \ 3371 "If C2 queue size is less than this amount per compiler thread " \ 3372 "allow methods compiled at tier 2 transition to tier 3") \ 3373 \ 3374 product(intx, Tier3LoadFeedback, 5, \ 3375 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3376 "reaches this amount per compiler thread") \ 3377 \ 3378 product(intx, Tier4LoadFeedback, 3, \ 3379 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3380 "reaches this amount per compiler thread") \ 3381 \ 3382 product(intx, TieredCompileTaskTimeout, 50, \ 3383 "Kill compile task if method was not used within " \ 3384 "given timeout in milliseconds") \ 3385 \ 3386 product(intx, TieredStopAtLevel, 4, \ 3387 "Stop at given compilation level") \ 3388 \ 3389 product(intx, Tier0ProfilingStartPercentage, 200, \ 3390 "Start profiling in interpreter if the counters exceed tier 3" \ 3391 "thresholds by the specified percentage") \ 3392 \ 3393 product(intx, TieredRateUpdateMinTime, 1, \ 3394 "Minimum rate sampling interval (in milliseconds)") \ 3395 \ 3396 product(intx, TieredRateUpdateMaxTime, 25, \ 3397 "Maximum rate sampling interval (in milliseconds)") \ 3398 \ 3399 product_pd(bool, TieredCompilation, \ 3400 "Enable tiered compilation") \ 3401 \ 3402 product(bool, PrintTieredEvents, false, \ 3403 "Print tiered events notifications") \ 3404 \ 3405 product(bool, StressTieredRuntime, false, \ 3406 "Alternate client and server compiler on compile requests") \ 3407 \ 3408 product_pd(intx, OnStackReplacePercentage, \ 3409 "NON_TIERED number of method invocations/branches (expressed as %"\ 3410 "of CompileThreshold) before (re-)compiling OSR code") \ 3411 \ 3412 product(intx, InterpreterProfilePercentage, 33, \ 3413 "NON_TIERED number of method invocations/branches (expressed as %"\ 3414 "of CompileThreshold) before profiling in the interpreter") \ 3415 \ 3416 develop(intx, MaxRecompilationSearchLength, 10, \ 3417 "max. # frames to inspect searching for recompilee") \ 3418 \ 3419 develop(intx, MaxInterpretedSearchLength, 3, \ 3420 "max. # interp. frames to skip when searching for recompilee") \ 3421 \ 3422 develop(intx, DesiredMethodLimit, 8000, \ 3423 "desired max. method size (in bytecodes) after inlining") \ 3424 \ 3425 develop(intx, HugeMethodLimit, 8000, \ 3426 "don't compile methods larger than this if " \ 3427 "+DontCompileHugeMethods") \ 3428 \ 3429 /* New JDK 1.4 reflection implementation */ \ 3430 \ 3431 develop(bool, UseNewReflection, true, \ 3432 "Temporary flag for transition to reflection based on dynamic " \ 3433 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3434 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3435 "changes were needed") \ 3436 \ 3437 develop(bool, VerifyReflectionBytecodes, false, \ 3438 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3439 "in situations like that described in 4486457 or for " \ 3440 "constructors generated for serialization, so can not be enabled "\ 3441 "in product.") \ 3442 \ 3443 product(bool, ReflectionWrapResolutionErrors, true, \ 3444 "Temporary flag for transition to AbstractMethodError wrapped " \ 3445 "in InvocationTargetException. See 6531596") \ 3446 \ 3447 \ 3448 develop(intx, FastSuperclassLimit, 8, \ 3449 "Depth of hardwired instanceof accelerator array") \ 3450 \ 3451 /* Properties for Java libraries */ \ 3452 \ 3453 product(intx, MaxDirectMemorySize, -1, \ 3454 "Maximum total size of NIO direct-buffer allocations") \ 3455 \ 3456 /* temporary developer defined flags */ \ 3457 \ 3458 diagnostic(bool, UseNewCode, false, \ 3459 "Testing Only: Use the new version while testing") \ 3460 \ 3461 diagnostic(bool, UseNewCode2, false, \ 3462 "Testing Only: Use the new version while testing") \ 3463 \ 3464 diagnostic(bool, UseNewCode3, false, \ 3465 "Testing Only: Use the new version while testing") \ 3466 \ 3467 /* flags for performance data collection */ \ 3468 \ 3469 product(bool, UsePerfData, true, \ 3470 "Flag to disable jvmstat instrumentation for performance testing" \ 3471 "and problem isolation purposes.") \ 3472 \ 3473 product(bool, PerfDataSaveToFile, false, \ 3474 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3475 \ 3476 product(ccstr, PerfDataSaveFile, NULL, \ 3477 "Save PerfData memory to the specified absolute pathname," \ 3478 "%p in the file name if present will be replaced by pid") \ 3479 \ 3480 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3481 "Data sampling interval in milliseconds") \ 3482 \ 3483 develop(bool, PerfTraceDataCreation, false, \ 3484 "Trace creation of Performance Data Entries") \ 3485 \ 3486 develop(bool, PerfTraceMemOps, false, \ 3487 "Trace PerfMemory create/attach/detach calls") \ 3488 \ 3489 product(bool, PerfDisableSharedMem, false, \ 3490 "Store performance data in standard memory") \ 3491 \ 3492 product(intx, PerfDataMemorySize, 32*K, \ 3493 "Size of performance data memory region. Will be rounded " \ 3494 "up to a multiple of the native os page size.") \ 3495 \ 3496 product(intx, PerfMaxStringConstLength, 1024, \ 3497 "Maximum PerfStringConstant string length before truncation") \ 3498 \ 3499 product(bool, PerfAllowAtExitRegistration, false, \ 3500 "Allow registration of atexit() methods") \ 3501 \ 3502 product(bool, PerfBypassFileSystemCheck, false, \ 3503 "Bypass Win32 file system criteria checks (Windows Only)") \ 3504 \ 3505 product(intx, UnguardOnExecutionViolation, 0, \ 3506 "Unguard page and retry on no-execute fault (Win32 only)" \ 3507 "0=off, 1=conservative, 2=aggressive") \ 3508 \ 3509 /* Serviceability Support */ \ 3510 \ 3511 product(bool, ManagementServer, false, \ 3512 "Create JMX Management Server") \ 3513 \ 3514 product(bool, DisableAttachMechanism, false, \ 3515 "Disable mechanism that allows tools to attach to this VM") \ 3516 \ 3517 product(bool, StartAttachListener, false, \ 3518 "Always start Attach Listener at VM startup") \ 3519 \ 3520 manageable(bool, PrintConcurrentLocks, false, \ 3521 "Print java.util.concurrent locks in thread dump") \ 3522 \ 3523 /* Shared spaces */ \ 3524 \ 3525 product(bool, UseSharedSpaces, true, \ 3526 "Use shared spaces in the permanent generation") \ 3527 \ 3528 product(bool, RequireSharedSpaces, false, \ 3529 "Require shared spaces in the permanent generation") \ 3530 \ 3531 product(bool, ForceSharedSpaces, false, \ 3532 "Require shared spaces in the permanent generation") \ 3533 \ 3534 product(bool, DumpSharedSpaces, false, \ 3535 "Special mode: JVM reads a class list, loads classes, builds " \ 3536 "shared spaces, and dumps the shared spaces to a file to be " \ 3537 "used in future JVM runs.") \ 3538 \ 3539 product(bool, PrintSharedSpaces, false, \ 3540 "Print usage of shared spaces") \ 3541 \ 3542 product(uintx, SharedDummyBlockSize, 512*M, \ 3543 "Size of dummy block used to shift heap addresses (in bytes)") \ 3544 \ 3545 product(uintx, SharedReadWriteSize, 12*M, \ 3546 "Size of read-write space in permanent generation (in bytes)") \ 3547 \ 3548 product(uintx, SharedReadOnlySize, 10*M, \ 3549 "Size of read-only space in permanent generation (in bytes)") \ 3550 \ 3551 product(uintx, SharedMiscDataSize, 4*M, \ 3552 "Size of the shared data area adjacent to the heap (in bytes)") \ 3553 \ 3554 product(uintx, SharedMiscCodeSize, 4*M, \ 3555 "Size of the shared code area adjacent to the heap (in bytes)") \ 3556 \ 3557 diagnostic(bool, SharedOptimizeColdStart, true, \ 3558 "At dump time, order shared objects to achieve better " \ 3559 "cold startup time.") \ 3560 \ 3561 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3562 "Reordering policy for SharedOptimizeColdStart " \ 3563 "0=favor classload-time locality, 1=balanced, " \ 3564 "2=favor runtime locality") \ 3565 \ 3566 diagnostic(bool, SharedSkipVerify, false, \ 3567 "Skip assert() and verify() which page-in unwanted shared " \ 3568 "objects. ") \ 3569 \ 3570 product(bool, AnonymousClasses, false, \ 3571 "support sun.misc.Unsafe.defineAnonymousClass") \ 3572 \ 3573 experimental(bool, EnableMethodHandles, false, \ 3574 "support method handles (true by default under JSR 292)") \ 3575 \ 3576 diagnostic(intx, MethodHandlePushLimit, 3, \ 3577 "number of additional stack slots a method handle may push") \ 3578 \ 3579 develop(bool, TraceMethodHandles, false, \ 3580 "trace internal method handle operations") \ 3581 \ 3582 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3583 "perform extra checks when constructing method handles") \ 3584 \ 3585 diagnostic(bool, OptimizeMethodHandles, true, \ 3586 "when constructing method handles, try to improve them") \ 3587 \ 3588 experimental(bool, TrustFinalNonStaticFields, false, \ 3589 "trust final non-static declarations for constant folding") \ 3590 \ 3591 experimental(bool, EnableInvokeDynamic, false, \ 3592 "recognize the invokedynamic instruction") \ 3593 \ 3594 experimental(bool, AllowTransitionalJSR292, true, \ 3595 "recognize pre-PFD formats of invokedynamic") \ 3596 \ 3597 develop(bool, TraceInvokeDynamic, false, \ 3598 "trace internal invoke dynamic operations") \ 3599 \ 3600 diagnostic(bool, PauseAtStartup, false, \ 3601 "Causes the VM to pause at startup time and wait for the pause " \ 3602 "file to be removed (default: ./vm.paused.<pid>)") \ 3603 \ 3604 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3605 "The file to create and for whose removal to await when pausing " \ 3606 "at startup. (default: ./vm.paused.<pid>)") \ 3607 \ 3608 product(bool, ExtendedDTraceProbes, false, \ 3609 "Enable performance-impacting dtrace probes") \ 3610 \ 3611 product(bool, DTraceMethodProbes, false, \ 3612 "Enable dtrace probes for method-entry and method-exit") \ 3613 \ 3614 product(bool, DTraceAllocProbes, false, \ 3615 "Enable dtrace probes for object allocation") \ 3616 \ 3617 product(bool, DTraceMonitorProbes, false, \ 3618 "Enable dtrace probes for monitor events") \ 3619 \ 3620 product(bool, RelaxAccessControlCheck, false, \ 3621 "Relax the access control checks in the verifier") \ 3622 \ 3623 diagnostic(bool, PrintDTraceDOF, false, \ 3624 "Print the DTrace DOF passed to the system for JSDT probes") \ 3625 \ 3626 product(bool, UseVMInterruptibleIO, false, \ 3627 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3628 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3629 " of this flag is true for JDK 6 and earliers") 3630 3631/* 3632 * Macros for factoring of globals 3633 */ 3634 3635// Interface macros 3636#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3637#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3638#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3639#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3640#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3641#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3642#ifdef PRODUCT 3643#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3644#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3645#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3646#else 3647#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3648#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3649#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3650#endif 3651// Special LP64 flags, product only needed for now. 3652#ifdef _LP64 3653#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3654#else 3655#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3656#endif // _LP64 3657 3658// Implementation macros 3659#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3660#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3661#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3662#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3663#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3664#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3665#ifdef PRODUCT 3666#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3667#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3668#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3669#else 3670#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3671#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3672#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3673#endif 3674#ifdef _LP64 3675#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3676#else 3677#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3678#endif // _LP64 3679 3680RUNTIME_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) 3681 3682RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3683