globals.hpp revision 1703:d5d065957597
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 const char *kind; 87 FlagValueOrigin origin; 88 89 // points to all Flags static array 90 static Flag *flags; 91 92 // number of flags 93 static size_t numFlags; 94 95 static Flag* find_flag(char* name, size_t length); 96 97 bool is_bool() const { return strcmp(type, "bool") == 0; } 98 bool get_bool() const { return *((bool*) addr); } 99 void set_bool(bool value) { *((bool*) addr) = value; } 100 101 bool is_intx() const { return strcmp(type, "intx") == 0; } 102 intx get_intx() const { return *((intx*) addr); } 103 void set_intx(intx value) { *((intx*) addr) = value; } 104 105 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 106 uintx get_uintx() const { return *((uintx*) addr); } 107 void set_uintx(uintx value) { *((uintx*) addr) = value; } 108 109 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 110 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 111 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 112 113 bool is_double() const { return strcmp(type, "double") == 0; } 114 double get_double() const { return *((double*) addr); } 115 void set_double(double value) { *((double*) addr) = value; } 116 117 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 118 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 119 ccstr get_ccstr() const { return *((ccstr*) addr); } 120 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 121 122 bool is_unlocker() const; 123 bool is_unlocked() const; 124 bool is_writeable() const; 125 bool is_external() const; 126 127 void print_on(outputStream* st); 128 void print_as_flag(outputStream* st); 129}; 130 131// debug flags control various aspects of the VM and are global accessible 132 133// use FlagSetting to temporarily change some debug flag 134// e.g. FlagSetting fs(DebugThisAndThat, true); 135// restored to previous value upon leaving scope 136class FlagSetting { 137 bool val; 138 bool* flag; 139 public: 140 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 141 ~FlagSetting() { *flag = val; } 142}; 143 144 145class CounterSetting { 146 intx* counter; 147 public: 148 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 149 ~CounterSetting() { (*counter)--; } 150}; 151 152 153class IntFlagSetting { 154 intx val; 155 intx* flag; 156 public: 157 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 158 ~IntFlagSetting() { *flag = val; } 159}; 160 161 162class DoubleFlagSetting { 163 double val; 164 double* flag; 165 public: 166 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 167 ~DoubleFlagSetting() { *flag = val; } 168}; 169 170 171class CommandLineFlags { 172 public: 173 static bool boolAt(char* name, size_t len, bool* value); 174 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 175 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 176 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 177 178 static bool intxAt(char* name, size_t len, intx* value); 179 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 180 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 181 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 182 183 static bool uintxAt(char* name, size_t len, uintx* value); 184 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 185 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 186 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 187 188 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 189 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 190 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 191 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 192 193 static bool doubleAt(char* name, size_t len, double* value); 194 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 195 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 196 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 197 198 static bool ccstrAt(char* name, size_t len, ccstr* value); 199 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 200 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 201 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 202 203 // Returns false if name is not a command line flag. 204 static bool wasSetOnCmdline(const char* name, bool* value); 205 static void printSetFlags(); 206 207 static void printFlags(); 208 209 static void verify() PRODUCT_RETURN; 210}; 211 212// use this for flags that are true by default in the debug version but 213// false in the optimized version, and vice versa 214#ifdef ASSERT 215#define trueInDebug true 216#define falseInDebug false 217#else 218#define trueInDebug false 219#define falseInDebug true 220#endif 221 222// use this for flags that are true per default in the product build 223// but false in development builds, and vice versa 224#ifdef PRODUCT 225#define trueInProduct true 226#define falseInProduct false 227#else 228#define trueInProduct false 229#define falseInProduct true 230#endif 231 232// use this for flags that are true per default in the tiered build 233// but false in non-tiered builds, and vice versa 234#ifdef TIERED 235#define trueInTiered true 236#define falseInTiered false 237#else 238#define trueInTiered false 239#define falseInTiered true 240#endif 241 242// develop flags are settable / visible only during development and are constant in the PRODUCT version 243// product flags are always settable / visible 244// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 245 246// A flag must be declared with one of the following types: 247// bool, intx, uintx, ccstr. 248// The type "ccstr" is an alias for "const char*" and is used 249// only in this file, because the macrology requires single-token type names. 250 251// Note: Diagnostic options not meant for VM tuning or for product modes. 252// They are to be used for VM quality assurance or field diagnosis 253// of VM bugs. They are hidden so that users will not be encouraged to 254// try them as if they were VM ordinary execution options. However, they 255// are available in the product version of the VM. Under instruction 256// from support engineers, VM customers can turn them on to collect 257// diagnostic information about VM problems. To use a VM diagnostic 258// option, you must first specify +UnlockDiagnosticVMOptions. 259// (This master switch also affects the behavior of -Xprintflags.) 260// 261// experimental flags are in support of features that are not 262// part of the officially supported product, but are available 263// for experimenting with. They could, for example, be performance 264// features that may not have undergone full or rigorous QA, but which may 265// help performance in some cases and released for experimentation 266// by the community of users and developers. This flag also allows one to 267// be able to build a fully supported product that nonetheless also 268// ships with some unsupported, lightly tested, experimental features. 269// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 270// UnlockExperimentalVMOptions flag, which allows the control and 271// modification of the experimental flags. 272// 273// manageable flags are writeable external product flags. 274// They are dynamically writeable through the JDK management interface 275// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 276// These flags are external exported interface (see CCC). The list of 277// manageable flags can be queried programmatically through the management 278// interface. 279// 280// A flag can be made as "manageable" only if 281// - the flag is defined in a CCC as an external exported interface. 282// - the VM implementation supports dynamic setting of the flag. 283// This implies that the VM must *always* query the flag variable 284// and not reuse state related to the flag state at any given time. 285// - you want the flag to be queried programmatically by the customers. 286// 287// product_rw flags are writeable internal product flags. 288// They are like "manageable" flags but for internal/private use. 289// The list of product_rw flags are internal/private flags which 290// may be changed/removed in a future release. It can be set 291// through the management interface to get/set value 292// when the name of flag is supplied. 293// 294// A flag can be made as "product_rw" only if 295// - the VM implementation supports dynamic setting of the flag. 296// This implies that the VM must *always* query the flag variable 297// and not reuse state related to the flag state at any given time. 298// 299// Note that when there is a need to support develop flags to be writeable, 300// it can be done in the same way as product_rw. 301 302#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 303 \ 304 lp64_product(bool, UseCompressedOops, false, \ 305 "Use 32-bit object references in 64-bit VM. " \ 306 "lp64_product means flag is always constant in 32 bit VM") \ 307 \ 308 notproduct(bool, CheckCompressedOops, true, \ 309 "generate checks in encoding/decoding code in debug VM") \ 310 \ 311 product_pd(uintx, HeapBaseMinAddress, \ 312 "OS specific low limit for heap base address") \ 313 \ 314 diagnostic(bool, PrintCompressedOopsMode, false, \ 315 "Print compressed oops base address and encoding mode") \ 316 \ 317 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 318 "Default object alignment in bytes, 8 is minimum") \ 319 \ 320 /* UseMembar is theoretically a temp flag used for memory barrier \ 321 * removal testing. It was supposed to be removed before FCS but has \ 322 * been re-added (see 6401008) */ \ 323 product(bool, UseMembar, false, \ 324 "(Unstable) Issues membars on thread state transitions") \ 325 \ 326 /* Temporary: See 6948537 */ \ 327 experimental(bool, UseMemSetInBOT, true, \ 328 "(Unstable) uses memset in BOT updates in GC code") \ 329 \ 330 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 331 "Enable normal processing of flags relating to field diagnostics")\ 332 \ 333 experimental(bool, UnlockExperimentalVMOptions, false, \ 334 "Enable normal processing of flags relating to experimental features")\ 335 \ 336 product(bool, JavaMonitorsInStackTrace, true, \ 337 "Print info. about Java monitor locks when the stacks are dumped")\ 338 \ 339 product_pd(bool, UseLargePages, \ 340 "Use large page memory") \ 341 \ 342 product_pd(bool, UseLargePagesIndividualAllocation, \ 343 "Allocate large pages individually for better affinity") \ 344 \ 345 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 346 "Fail large pages individual allocation") \ 347 \ 348 develop(bool, TracePageSizes, false, \ 349 "Trace page size selection and usage.") \ 350 \ 351 product(bool, UseNUMA, false, \ 352 "Use NUMA if available") \ 353 \ 354 product(bool, ForceNUMA, false, \ 355 "Force NUMA optimizations on single-node/UMA systems") \ 356 \ 357 product(intx, NUMAChunkResizeWeight, 20, \ 358 "Percentage (0-100) used to weight the current sample when " \ 359 "computing exponentially decaying average for " \ 360 "AdaptiveNUMAChunkSizing") \ 361 \ 362 product(intx, NUMASpaceResizeRate, 1*G, \ 363 "Do not reallocate more that this amount per collection") \ 364 \ 365 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 366 "Enable adaptive chunk sizing for NUMA") \ 367 \ 368 product(bool, NUMAStats, false, \ 369 "Print NUMA stats in detailed heap information") \ 370 \ 371 product(intx, NUMAPageScanRate, 256, \ 372 "Maximum number of pages to include in the page scan procedure") \ 373 \ 374 product_pd(bool, NeedsDeoptSuspend, \ 375 "True for register window machines (sparc/ia64)") \ 376 \ 377 product(intx, UseSSE, 99, \ 378 "Highest supported SSE instructions set on x86/x64") \ 379 \ 380 product(uintx, LargePageSizeInBytes, 0, \ 381 "Large page size (0 to let VM choose the page size") \ 382 \ 383 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 384 "Use large pages if max heap is at least this big") \ 385 \ 386 product(bool, ForceTimeHighResolution, false, \ 387 "Using high time resolution(For Win32 only)") \ 388 \ 389 develop(bool, TraceItables, false, \ 390 "Trace initialization and use of itables") \ 391 \ 392 develop(bool, TracePcPatching, false, \ 393 "Trace usage of frame::patch_pc") \ 394 \ 395 develop(bool, TraceJumps, false, \ 396 "Trace assembly jumps in thread ring buffer") \ 397 \ 398 develop(bool, TraceRelocator, false, \ 399 "Trace the bytecode relocator") \ 400 \ 401 develop(bool, TraceLongCompiles, false, \ 402 "Print out every time compilation is longer than " \ 403 "a given threashold") \ 404 \ 405 develop(bool, SafepointALot, false, \ 406 "Generates a lot of safepoints. Works with " \ 407 "GuaranteedSafepointInterval") \ 408 \ 409 product_pd(bool, BackgroundCompilation, \ 410 "A thread requesting compilation is not blocked during " \ 411 "compilation") \ 412 \ 413 product(bool, PrintVMQWaitTime, false, \ 414 "Prints out the waiting time in VM operation queue") \ 415 \ 416 develop(bool, BailoutToInterpreterForThrows, false, \ 417 "Compiled methods which throws/catches exceptions will be " \ 418 "deopt and intp.") \ 419 \ 420 develop(bool, NoYieldsInMicrolock, false, \ 421 "Disable yields in microlock") \ 422 \ 423 develop(bool, TraceOopMapGeneration, false, \ 424 "Shows oopmap generation") \ 425 \ 426 product(bool, MethodFlushing, true, \ 427 "Reclamation of zombie and not-entrant methods") \ 428 \ 429 develop(bool, VerifyStack, false, \ 430 "Verify stack of each thread when it is entering a runtime call") \ 431 \ 432 develop(bool, ForceUnreachable, false, \ 433 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 434 \ 435 notproduct(bool, StressDerivedPointers, false, \ 436 "Force scavenge when a derived pointers is detected on stack " \ 437 "after rtm call") \ 438 \ 439 develop(bool, TraceDerivedPointers, false, \ 440 "Trace traversal of derived pointers on stack") \ 441 \ 442 notproduct(bool, TraceCodeBlobStacks, false, \ 443 "Trace stack-walk of codeblobs") \ 444 \ 445 product(bool, PrintJNIResolving, false, \ 446 "Used to implement -v:jni") \ 447 \ 448 notproduct(bool, PrintRewrites, false, \ 449 "Print methods that are being rewritten") \ 450 \ 451 product(bool, UseInlineCaches, true, \ 452 "Use Inline Caches for virtual calls ") \ 453 \ 454 develop(bool, InlineArrayCopy, true, \ 455 "inline arraycopy native that is known to be part of " \ 456 "base library DLL") \ 457 \ 458 develop(bool, InlineObjectHash, true, \ 459 "inline Object::hashCode() native that is known to be part " \ 460 "of base library DLL") \ 461 \ 462 develop(bool, InlineObjectCopy, true, \ 463 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 464 \ 465 develop(bool, InlineNatives, true, \ 466 "inline natives that are known to be part of base library DLL") \ 467 \ 468 develop(bool, InlineMathNatives, true, \ 469 "inline SinD, CosD, etc.") \ 470 \ 471 develop(bool, InlineClassNatives, true, \ 472 "inline Class.isInstance, etc") \ 473 \ 474 develop(bool, InlineAtomicLong, true, \ 475 "inline sun.misc.AtomicLong") \ 476 \ 477 develop(bool, InlineThreadNatives, true, \ 478 "inline Thread.currentThread, etc") \ 479 \ 480 develop(bool, InlineReflectionGetCallerClass, true, \ 481 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 482 "of base library DLL") \ 483 \ 484 develop(bool, InlineUnsafeOps, true, \ 485 "inline memory ops (native methods) from sun.misc.Unsafe") \ 486 \ 487 develop(bool, ConvertCmpD2CmpF, true, \ 488 "Convert cmpD to cmpF when one input is constant in float range") \ 489 \ 490 develop(bool, ConvertFloat2IntClipping, true, \ 491 "Convert float2int clipping idiom to integer clipping") \ 492 \ 493 develop(bool, SpecialStringCompareTo, true, \ 494 "special version of string compareTo") \ 495 \ 496 develop(bool, SpecialStringIndexOf, true, \ 497 "special version of string indexOf") \ 498 \ 499 develop(bool, SpecialStringEquals, true, \ 500 "special version of string equals") \ 501 \ 502 develop(bool, SpecialArraysEquals, true, \ 503 "special version of Arrays.equals(char[],char[])") \ 504 \ 505 product(bool, UseSSE42Intrinsics, false, \ 506 "SSE4.2 versions of intrinsics") \ 507 \ 508 develop(bool, TraceCallFixup, false, \ 509 "traces all call fixups") \ 510 \ 511 develop(bool, DeoptimizeALot, false, \ 512 "deoptimize at every exit from the runtime system") \ 513 \ 514 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 515 "a comma separated list of bcis to deoptimize at") \ 516 \ 517 product(bool, DeoptimizeRandom, false, \ 518 "deoptimize random frames on random exit from the runtime system")\ 519 \ 520 notproduct(bool, ZombieALot, false, \ 521 "creates zombies (non-entrant) at exit from the runt. system") \ 522 \ 523 notproduct(bool, WalkStackALot, false, \ 524 "trace stack (no print) at every exit from the runtime system") \ 525 \ 526 develop(bool, Debugging, false, \ 527 "set when executing debug methods in debug.ccp " \ 528 "(to prevent triggering assertions)") \ 529 \ 530 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 531 "Enable strict checks that safepoints cannot happen for threads " \ 532 "that used No_Safepoint_Verifier") \ 533 \ 534 notproduct(bool, VerifyLastFrame, false, \ 535 "Verify oops on last frame on entry to VM") \ 536 \ 537 develop(bool, TraceHandleAllocation, false, \ 538 "Prints out warnings when suspicious many handles are allocated") \ 539 \ 540 product(bool, UseCompilerSafepoints, true, \ 541 "Stop at safepoints in compiled code") \ 542 \ 543 product(bool, UseSplitVerifier, true, \ 544 "use split verifier with StackMapTable attributes") \ 545 \ 546 product(bool, FailOverToOldVerifier, true, \ 547 "fail over to old verifier when split verifier fails") \ 548 \ 549 develop(bool, ShowSafepointMsgs, false, \ 550 "Show msg. about safepoint synch.") \ 551 \ 552 product(bool, SafepointTimeout, false, \ 553 "Time out and warn or fail after SafepointTimeoutDelay " \ 554 "milliseconds if failed to reach safepoint") \ 555 \ 556 develop(bool, DieOnSafepointTimeout, false, \ 557 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 558 \ 559 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 560 /* typically, at most a few retries are needed */ \ 561 product(intx, SuspendRetryCount, 50, \ 562 "Maximum retry count for an external suspend request") \ 563 \ 564 product(intx, SuspendRetryDelay, 5, \ 565 "Milliseconds to delay per retry (* current_retry_count)") \ 566 \ 567 product(bool, AssertOnSuspendWaitFailure, false, \ 568 "Assert/Guarantee on external suspend wait failure") \ 569 \ 570 product(bool, TraceSuspendWaitFailures, false, \ 571 "Trace external suspend wait failures") \ 572 \ 573 product(bool, MaxFDLimit, true, \ 574 "Bump the number of file descriptors to max in solaris.") \ 575 \ 576 notproduct(bool, LogEvents, trueInDebug, \ 577 "Enable Event log") \ 578 \ 579 product(bool, BytecodeVerificationRemote, true, \ 580 "Enables the Java bytecode verifier for remote classes") \ 581 \ 582 product(bool, BytecodeVerificationLocal, false, \ 583 "Enables the Java bytecode verifier for local classes") \ 584 \ 585 develop(bool, ForceFloatExceptions, trueInDebug, \ 586 "Force exceptions on FP stack under/overflow") \ 587 \ 588 develop(bool, SoftMatchFailure, trueInProduct, \ 589 "If the DFA fails to match a node, print a message and bail out") \ 590 \ 591 develop(bool, VerifyStackAtCalls, false, \ 592 "Verify that the stack pointer is unchanged after calls") \ 593 \ 594 develop(bool, TraceJavaAssertions, false, \ 595 "Trace java language assertions") \ 596 \ 597 notproduct(bool, CheckAssertionStatusDirectives, false, \ 598 "temporary - see javaClasses.cpp") \ 599 \ 600 notproduct(bool, PrintMallocFree, false, \ 601 "Trace calls to C heap malloc/free allocation") \ 602 \ 603 product(bool, PrintOopAddress, false, \ 604 "Always print the location of the oop") \ 605 \ 606 notproduct(bool, VerifyCodeCacheOften, false, \ 607 "Verify compiled-code cache often") \ 608 \ 609 develop(bool, ZapDeadCompiledLocals, false, \ 610 "Zap dead locals in compiler frames") \ 611 \ 612 notproduct(bool, ZapDeadLocalsOld, false, \ 613 "Zap dead locals (old version, zaps all frames when " \ 614 "entering the VM") \ 615 \ 616 notproduct(bool, CheckOopishValues, false, \ 617 "Warn if value contains oop ( requires ZapDeadLocals)") \ 618 \ 619 develop(bool, UseMallocOnly, false, \ 620 "use only malloc/free for allocation (no resource area/arena)") \ 621 \ 622 develop(bool, PrintMalloc, false, \ 623 "print all malloc/free calls") \ 624 \ 625 develop(bool, ZapResourceArea, trueInDebug, \ 626 "Zap freed resource/arena space with 0xABABABAB") \ 627 \ 628 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 629 "Zap freed VM handle space with 0xBCBCBCBC") \ 630 \ 631 develop(bool, ZapJNIHandleArea, trueInDebug, \ 632 "Zap freed JNI handle space with 0xFEFEFEFE") \ 633 \ 634 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 635 "Zap unused heap space with 0xBAADBABE") \ 636 \ 637 develop(bool, TraceZapUnusedHeapArea, false, \ 638 "Trace zapping of unused heap space") \ 639 \ 640 develop(bool, CheckZapUnusedHeapArea, false, \ 641 "Check zapping of unused heap space") \ 642 \ 643 develop(bool, ZapFillerObjects, trueInDebug, \ 644 "Zap filler objects with 0xDEAFBABE") \ 645 \ 646 develop(bool, PrintVMMessages, true, \ 647 "Print vm messages on console") \ 648 \ 649 product(bool, PrintGCApplicationConcurrentTime, false, \ 650 "Print the time the application has been running") \ 651 \ 652 product(bool, PrintGCApplicationStoppedTime, false, \ 653 "Print the time the application has been stopped") \ 654 \ 655 notproduct(uintx, ErrorHandlerTest, 0, \ 656 "If > 0, provokes an error after VM initialization; the value" \ 657 "determines which error to provoke. See test_error_handler()" \ 658 "in debug.cpp.") \ 659 \ 660 develop(bool, Verbose, false, \ 661 "Prints additional debugging information from other modes") \ 662 \ 663 develop(bool, PrintMiscellaneous, false, \ 664 "Prints uncategorized debugging information (requires +Verbose)") \ 665 \ 666 develop(bool, WizardMode, false, \ 667 "Prints much more debugging information") \ 668 \ 669 product(bool, ShowMessageBoxOnError, false, \ 670 "Keep process alive on VM fatal error") \ 671 \ 672 product_pd(bool, UseOSErrorReporting, \ 673 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 674 \ 675 product(bool, SuppressFatalErrorMessage, false, \ 676 "Do NO Fatal Error report [Avoid deadlock]") \ 677 \ 678 product(ccstrlist, OnError, "", \ 679 "Run user-defined commands on fatal error; see VMError.cpp " \ 680 "for examples") \ 681 \ 682 product(ccstrlist, OnOutOfMemoryError, "", \ 683 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 684 \ 685 manageable(bool, HeapDumpBeforeFullGC, false, \ 686 "Dump heap to file before any major stop-world GC") \ 687 \ 688 manageable(bool, HeapDumpAfterFullGC, false, \ 689 "Dump heap to file after any major stop-world GC") \ 690 \ 691 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 692 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 693 \ 694 manageable(ccstr, HeapDumpPath, NULL, \ 695 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 696 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 697 "in the working directory)") \ 698 \ 699 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 700 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 701 "when the heap usage is larger than this") \ 702 \ 703 develop(uintx, HeapDumpSegmentSize, 1*G, \ 704 "Approximate segment size when generating a segmented heap dump") \ 705 \ 706 develop(bool, BreakAtWarning, false, \ 707 "Execute breakpoint upon encountering VM warning") \ 708 \ 709 product_pd(bool, UseVectoredExceptions, \ 710 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 711 \ 712 develop(bool, TraceVMOperation, false, \ 713 "Trace vm operations") \ 714 \ 715 develop(bool, UseFakeTimers, false, \ 716 "Tells whether the VM should use system time or a fake timer") \ 717 \ 718 diagnostic(bool, LogCompilation, false, \ 719 "Log compilation activity in detail to hotspot.log or LogFile") \ 720 \ 721 product(bool, PrintCompilation, false, \ 722 "Print compilations") \ 723 \ 724 diagnostic(bool, TraceNMethodInstalls, false, \ 725 "Trace nmethod intallation") \ 726 \ 727 diagnostic(intx, ScavengeRootsInCode, 0, \ 728 "0: do not allow scavengable oops in the code cache; " \ 729 "1: allow scavenging from the code cache; " \ 730 "2: emit as many constants as the compiler can see") \ 731 \ 732 diagnostic(bool, TraceOSRBreakpoint, false, \ 733 "Trace OSR Breakpoint ") \ 734 \ 735 diagnostic(bool, TraceCompileTriggered, false, \ 736 "Trace compile triggered") \ 737 \ 738 diagnostic(bool, TraceTriggers, false, \ 739 "Trace triggers") \ 740 \ 741 product(bool, AlwaysRestoreFPU, false, \ 742 "Restore the FPU control word after every JNI call (expensive)") \ 743 \ 744 notproduct(bool, PrintCompilation2, false, \ 745 "Print additional statistics per compilation") \ 746 \ 747 diagnostic(bool, PrintAdapterHandlers, false, \ 748 "Print code generated for i2c/c2i adapters") \ 749 \ 750 develop(bool, VerifyAdapterSharing, false, \ 751 "Verify that the code for shared adapters is the equivalent") \ 752 \ 753 diagnostic(bool, PrintAssembly, false, \ 754 "Print assembly code (using external disassembler.so)") \ 755 \ 756 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 757 "Options string passed to disassembler.so") \ 758 \ 759 diagnostic(bool, PrintNMethods, false, \ 760 "Print assembly code for nmethods when generated") \ 761 \ 762 diagnostic(bool, PrintNativeNMethods, false, \ 763 "Print assembly code for native nmethods when generated") \ 764 \ 765 develop(bool, PrintDebugInfo, false, \ 766 "Print debug information for all nmethods when generated") \ 767 \ 768 develop(bool, PrintRelocations, false, \ 769 "Print relocation information for all nmethods when generated") \ 770 \ 771 develop(bool, PrintDependencies, false, \ 772 "Print dependency information for all nmethods when generated") \ 773 \ 774 develop(bool, PrintExceptionHandlers, false, \ 775 "Print exception handler tables for all nmethods when generated") \ 776 \ 777 develop(bool, InterceptOSException, false, \ 778 "Starts debugger when an implicit OS (e.g., NULL) " \ 779 "exception happens") \ 780 \ 781 notproduct(bool, PrintCodeCache, false, \ 782 "Print the compiled_code cache when exiting") \ 783 \ 784 develop(bool, PrintCodeCache2, false, \ 785 "Print detailed info on the compiled_code cache when exiting") \ 786 \ 787 diagnostic(bool, PrintStubCode, false, \ 788 "Print generated stub code") \ 789 \ 790 product(bool, StackTraceInThrowable, true, \ 791 "Collect backtrace in throwable when exception happens") \ 792 \ 793 product(bool, OmitStackTraceInFastThrow, true, \ 794 "Omit backtraces for some 'hot' exceptions in optimized code") \ 795 \ 796 product(bool, ProfilerPrintByteCodeStatistics, false, \ 797 "Prints byte code statictics when dumping profiler output") \ 798 \ 799 product(bool, ProfilerRecordPC, false, \ 800 "Collects tick for each 16 byte interval of compiled code") \ 801 \ 802 product(bool, ProfileVM, false, \ 803 "Profiles ticks that fall within VM (either in the VM Thread " \ 804 "or VM code called through stubs)") \ 805 \ 806 product(bool, ProfileIntervals, false, \ 807 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 808 \ 809 notproduct(bool, ProfilerCheckIntervals, false, \ 810 "Collect and print info on spacing of profiler ticks") \ 811 \ 812 develop(bool, PrintJVMWarnings, false, \ 813 "Prints warnings for unimplemented JVM functions") \ 814 \ 815 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 816 "Prints warnings for stalled SpinLocks") \ 817 \ 818 develop(bool, InitializeJavaLangSystem, true, \ 819 "Initialize java.lang.System - turn off for individual " \ 820 "method debugging") \ 821 \ 822 develop(bool, InitializeJavaLangString, true, \ 823 "Initialize java.lang.String - turn off for individual " \ 824 "method debugging") \ 825 \ 826 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 827 "Initialize various error and exception classes - turn off for " \ 828 "individual method debugging") \ 829 \ 830 product(bool, RegisterFinalizersAtInit, true, \ 831 "Register finalizable objects at end of Object.<init> or " \ 832 "after allocation") \ 833 \ 834 develop(bool, RegisterReferences, true, \ 835 "Tells whether the VM should register soft/weak/final/phantom " \ 836 "references") \ 837 \ 838 develop(bool, IgnoreRewrites, false, \ 839 "Supress rewrites of bytecodes in the oopmap generator. " \ 840 "This is unsafe!") \ 841 \ 842 develop(bool, PrintCodeCacheExtension, false, \ 843 "Print extension of code cache") \ 844 \ 845 develop(bool, UsePrivilegedStack, true, \ 846 "Enable the security JVM functions") \ 847 \ 848 develop(bool, IEEEPrecision, true, \ 849 "Enables IEEE precision (for INTEL only)") \ 850 \ 851 develop(bool, ProtectionDomainVerification, true, \ 852 "Verifies protection domain before resolution in system " \ 853 "dictionary") \ 854 \ 855 product(bool, ClassUnloading, true, \ 856 "Do unloading of classes") \ 857 \ 858 diagnostic(bool, LinkWellKnownClasses, false, \ 859 "Resolve a well known class as soon as its name is seen") \ 860 \ 861 develop(bool, DisableStartThread, false, \ 862 "Disable starting of additional Java threads " \ 863 "(for debugging only)") \ 864 \ 865 develop(bool, MemProfiling, false, \ 866 "Write memory usage profiling to log file") \ 867 \ 868 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 869 "Prints the system dictionary at exit") \ 870 \ 871 diagnostic(bool, UnsyncloadClass, false, \ 872 "Unstable: VM calls loadClass unsynchronized. Custom " \ 873 "class loader must call VM synchronized for findClass " \ 874 "and defineClass.") \ 875 \ 876 product(bool, AlwaysLockClassLoader, false, \ 877 "Require the VM to acquire the class loader lock before calling " \ 878 "loadClass() even for class loaders registering " \ 879 "as parallel capable") \ 880 \ 881 product(bool, AllowParallelDefineClass, false, \ 882 "Allow parallel defineClass requests for class loaders " \ 883 "registering as parallel capable") \ 884 \ 885 product(bool, MustCallLoadClassInternal, false, \ 886 "Call loadClassInternal() rather than loadClass()") \ 887 \ 888 product_pd(bool, DontYieldALot, \ 889 "Throw away obvious excess yield calls (for SOLARIS only)") \ 890 \ 891 product_pd(bool, ConvertSleepToYield, \ 892 "Converts sleep(0) to thread yield " \ 893 "(may be off for SOLARIS to improve GUI)") \ 894 \ 895 product(bool, ConvertYieldToSleep, false, \ 896 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 897 "behavior (SOLARIS only)") \ 898 \ 899 product(bool, UseBoundThreads, true, \ 900 "Bind user level threads to kernel threads (for SOLARIS only)") \ 901 \ 902 develop(bool, UseDetachedThreads, true, \ 903 "Use detached threads that are recycled upon termination " \ 904 "(for SOLARIS only)") \ 905 \ 906 product(bool, UseLWPSynchronization, true, \ 907 "Use LWP-based instead of libthread-based synchronization " \ 908 "(SPARC only)") \ 909 \ 910 product(ccstr, SyncKnobs, NULL, \ 911 "(Unstable) Various monitor synchronization tunables") \ 912 \ 913 product(intx, EmitSync, 0, \ 914 "(Unsafe,Unstable) " \ 915 " Controls emission of inline sync fast-path code") \ 916 \ 917 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 918 \ 919 product(intx, MonitorBound, 0, "Bound Monitor population") \ 920 \ 921 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 922 \ 923 product(intx, Atomics, 0, \ 924 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 925 \ 926 product(intx, FenceInstruction, 0, \ 927 "(Unsafe,Unstable) Experimental") \ 928 \ 929 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 930 \ 931 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 932 \ 933 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 934 \ 935 product(intx, hashCode, 0, \ 936 "(Unstable) select hashCode generation algorithm" ) \ 937 \ 938 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 939 "(Unstable, Linux-specific)" \ 940 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 941 \ 942 product(bool, FilterSpuriousWakeups, true, \ 943 "Prevent spurious or premature wakeups from object.wait " \ 944 "(Solaris only)") \ 945 \ 946 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 947 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 948 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 949 \ 950 develop(bool, UsePthreads, false, \ 951 "Use pthread-based instead of libthread-based synchronization " \ 952 "(SPARC only)") \ 953 \ 954 product(bool, AdjustConcurrency, false, \ 955 "call thr_setconcurrency at thread create time to avoid " \ 956 "LWP starvation on MP systems (For Solaris Only)") \ 957 \ 958 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 959 "Should the system attempt to update the compiler file when " \ 960 "an error occurs?") \ 961 \ 962 product(bool, ReduceSignalUsage, false, \ 963 "Reduce the use of OS signals in Java and/or the VM") \ 964 \ 965 notproduct(bool, ValidateMarkSweep, false, \ 966 "Do extra validation during MarkSweep collection") \ 967 \ 968 notproduct(bool, RecordMarkSweepCompaction, false, \ 969 "Enable GC-to-GC recording and querying of compaction during " \ 970 "MarkSweep") \ 971 \ 972 develop_pd(bool, ShareVtableStubs, \ 973 "Share vtable stubs (smaller code but worse branch prediction") \ 974 \ 975 develop(bool, LoadLineNumberTables, true, \ 976 "Tells whether the class file parser loads line number tables") \ 977 \ 978 develop(bool, LoadLocalVariableTables, true, \ 979 "Tells whether the class file parser loads local variable tables")\ 980 \ 981 develop(bool, LoadLocalVariableTypeTables, true, \ 982 "Tells whether the class file parser loads local variable type tables")\ 983 \ 984 product(bool, AllowUserSignalHandlers, false, \ 985 "Do not complain if the application installs signal handlers " \ 986 "(Solaris & Linux only)") \ 987 \ 988 product(bool, UseSignalChaining, true, \ 989 "Use signal-chaining to invoke signal handlers installed " \ 990 "by the application (Solaris & Linux only)") \ 991 \ 992 product(bool, UseAltSigs, false, \ 993 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 994 "internal signals (Solaris only)") \ 995 \ 996 product(bool, UseSpinning, false, \ 997 "Use spinning in monitor inflation and before entry") \ 998 \ 999 product(bool, PreSpinYield, false, \ 1000 "Yield before inner spinning loop") \ 1001 \ 1002 product(bool, PostSpinYield, true, \ 1003 "Yield after inner spinning loop") \ 1004 \ 1005 product(bool, AllowJNIEnvProxy, false, \ 1006 "Allow JNIEnv proxies for jdbx") \ 1007 \ 1008 product(bool, JNIDetachReleasesMonitors, true, \ 1009 "JNI DetachCurrentThread releases monitors owned by thread") \ 1010 \ 1011 product(bool, RestoreMXCSROnJNICalls, false, \ 1012 "Restore MXCSR when returning from JNI calls") \ 1013 \ 1014 product(bool, CheckJNICalls, false, \ 1015 "Verify all arguments to JNI calls") \ 1016 \ 1017 product(bool, UseFastJNIAccessors, true, \ 1018 "Use optimized versions of Get<Primitive>Field") \ 1019 \ 1020 product(bool, EagerXrunInit, false, \ 1021 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1022 " but not all -Xrun libraries may support the state of the VM at this time") \ 1023 \ 1024 product(bool, PreserveAllAnnotations, false, \ 1025 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1026 \ 1027 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1028 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1029 \ 1030 product(bool, LazyBootClassLoader, true, \ 1031 "Enable/disable lazy opening of boot class path entries") \ 1032 \ 1033 diagnostic(bool, UseIncDec, true, \ 1034 "Use INC, DEC instructions on x86") \ 1035 \ 1036 product(bool, UseNewLongLShift, false, \ 1037 "Use optimized bitwise shift left") \ 1038 \ 1039 product(bool, UseStoreImmI16, true, \ 1040 "Use store immediate 16-bits value instruction on x86") \ 1041 \ 1042 product(bool, UseAddressNop, false, \ 1043 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1044 \ 1045 product(bool, UseXmmLoadAndClearUpper, true, \ 1046 "Load low part of XMM register and clear upper part") \ 1047 \ 1048 product(bool, UseXmmRegToRegMoveAll, false, \ 1049 "Copy all XMM register bits when moving value between registers") \ 1050 \ 1051 product(bool, UseXmmI2D, false, \ 1052 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1053 \ 1054 product(bool, UseXmmI2F, false, \ 1055 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1056 \ 1057 product(bool, UseXMMForArrayCopy, false, \ 1058 "Use SSE2 MOVQ instruction for Arraycopy") \ 1059 \ 1060 product(bool, UseUnalignedLoadStores, false, \ 1061 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1062 \ 1063 product(intx, FieldsAllocationStyle, 1, \ 1064 "0 - type based with oops first, 1 - with oops last, " \ 1065 "2 - oops in super and sub classes are together") \ 1066 \ 1067 product(bool, CompactFields, true, \ 1068 "Allocate nonstatic fields in gaps between previous fields") \ 1069 \ 1070 notproduct(bool, PrintCompactFieldsSavings, false, \ 1071 "Print how many words were saved with CompactFields") \ 1072 \ 1073 product(bool, UseBiasedLocking, true, \ 1074 "Enable biased locking in JVM") \ 1075 \ 1076 product(intx, BiasedLockingStartupDelay, 4000, \ 1077 "Number of milliseconds to wait before enabling biased locking") \ 1078 \ 1079 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1080 "Print statistics of biased locking in JVM") \ 1081 \ 1082 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1083 "Threshold of number of revocations per type to try to " \ 1084 "rebias all objects in the heap of that type") \ 1085 \ 1086 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1087 "Threshold of number of revocations per type to permanently " \ 1088 "revoke biases of all objects in the heap of that type") \ 1089 \ 1090 product(intx, BiasedLockingDecayTime, 25000, \ 1091 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1092 "type after previous bulk rebias") \ 1093 \ 1094 /* tracing */ \ 1095 \ 1096 notproduct(bool, TraceRuntimeCalls, false, \ 1097 "Trace run-time calls") \ 1098 \ 1099 develop(bool, TraceJNICalls, false, \ 1100 "Trace JNI calls") \ 1101 \ 1102 notproduct(bool, TraceJVMCalls, false, \ 1103 "Trace JVM calls") \ 1104 \ 1105 product(ccstr, TraceJVMTI, NULL, \ 1106 "Trace flags for JVMTI functions and events") \ 1107 \ 1108 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1109 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1110 \ 1111 /* This option can change an EMCP method into an obsolete method. */ \ 1112 /* This can affect tests that except specific methods to be EMCP. */ \ 1113 /* This option should be used with caution. */ \ 1114 product(bool, StressLdcRewrite, false, \ 1115 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1116 \ 1117 product(intx, TraceRedefineClasses, 0, \ 1118 "Trace level for JVMTI RedefineClasses") \ 1119 \ 1120 develop(bool, StressMethodComparator, false, \ 1121 "run the MethodComparator on all loaded methods") \ 1122 \ 1123 /* change to false by default sometime after Mustang */ \ 1124 product(bool, VerifyMergedCPBytecodes, true, \ 1125 "Verify bytecodes after RedefineClasses constant pool merging") \ 1126 \ 1127 develop(bool, TraceJNIHandleAllocation, false, \ 1128 "Trace allocation/deallocation of JNI handle blocks") \ 1129 \ 1130 develop(bool, TraceThreadEvents, false, \ 1131 "Trace all thread events") \ 1132 \ 1133 develop(bool, TraceBytecodes, false, \ 1134 "Trace bytecode execution") \ 1135 \ 1136 develop(bool, TraceClassInitialization, false, \ 1137 "Trace class initialization") \ 1138 \ 1139 develop(bool, TraceExceptions, false, \ 1140 "Trace exceptions") \ 1141 \ 1142 develop(bool, TraceICs, false, \ 1143 "Trace inline cache changes") \ 1144 \ 1145 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1146 "Trace method invocation counter overflow") \ 1147 \ 1148 develop(bool, TraceInlineCacheClearing, false, \ 1149 "Trace clearing of inline caches in nmethods") \ 1150 \ 1151 develop(bool, TraceDependencies, false, \ 1152 "Trace dependencies") \ 1153 \ 1154 develop(bool, VerifyDependencies, trueInDebug, \ 1155 "Exercise and verify the compilation dependency mechanism") \ 1156 \ 1157 develop(bool, TraceNewOopMapGeneration, false, \ 1158 "Trace OopMapGeneration") \ 1159 \ 1160 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1161 "Trace OopMapGeneration: print detailed cell states") \ 1162 \ 1163 develop(bool, TimeOopMap, false, \ 1164 "Time calls to GenerateOopMap::compute_map() in sum") \ 1165 \ 1166 develop(bool, TimeOopMap2, false, \ 1167 "Time calls to GenerateOopMap::compute_map() individually") \ 1168 \ 1169 develop(bool, TraceMonitorMismatch, false, \ 1170 "Trace monitor matching failures during OopMapGeneration") \ 1171 \ 1172 develop(bool, TraceOopMapRewrites, false, \ 1173 "Trace rewritting of method oops during oop map generation") \ 1174 \ 1175 develop(bool, TraceSafepoint, false, \ 1176 "Trace safepoint operations") \ 1177 \ 1178 develop(bool, TraceICBuffer, false, \ 1179 "Trace usage of IC buffer") \ 1180 \ 1181 develop(bool, TraceCompiledIC, false, \ 1182 "Trace changes of compiled IC") \ 1183 \ 1184 notproduct(bool, TraceZapDeadLocals, false, \ 1185 "Trace zapping dead locals") \ 1186 \ 1187 develop(bool, TraceStartupTime, false, \ 1188 "Trace setup time") \ 1189 \ 1190 develop(bool, TraceHPI, false, \ 1191 "Trace Host Porting Interface (HPI)") \ 1192 \ 1193 product(ccstr, HPILibPath, NULL, \ 1194 "Specify alternate path to HPI library") \ 1195 \ 1196 develop(bool, TraceProtectionDomainVerification, false, \ 1197 "Trace protection domain verifcation") \ 1198 \ 1199 develop(bool, TraceClearedExceptions, false, \ 1200 "Prints when an exception is forcibly cleared") \ 1201 \ 1202 product(bool, TraceClassResolution, false, \ 1203 "Trace all constant pool resolutions (for debugging)") \ 1204 \ 1205 product(bool, TraceBiasedLocking, false, \ 1206 "Trace biased locking in JVM") \ 1207 \ 1208 product(bool, TraceMonitorInflation, false, \ 1209 "Trace monitor inflation in JVM") \ 1210 \ 1211 /* assembler */ \ 1212 product(bool, Use486InstrsOnly, false, \ 1213 "Use 80486 Compliant instruction subset") \ 1214 \ 1215 /* gc */ \ 1216 \ 1217 product(bool, UseSerialGC, false, \ 1218 "Use the serial garbage collector") \ 1219 \ 1220 product(bool, UseG1GC, false, \ 1221 "Use the Garbage-First garbage collector") \ 1222 \ 1223 product(bool, UseParallelGC, false, \ 1224 "Use the Parallel Scavenge garbage collector") \ 1225 \ 1226 product(bool, UseParallelOldGC, false, \ 1227 "Use the Parallel Old garbage collector") \ 1228 \ 1229 product(bool, UseParallelOldGCCompacting, true, \ 1230 "In the Parallel Old garbage collector use parallel compaction") \ 1231 \ 1232 product(bool, UseParallelDensePrefixUpdate, true, \ 1233 "In the Parallel Old garbage collector use parallel dense" \ 1234 " prefix update") \ 1235 \ 1236 product(uintx, HeapMaximumCompactionInterval, 20, \ 1237 "How often should we maximally compact the heap (not allowing " \ 1238 "any dead space)") \ 1239 \ 1240 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1241 "The collection count for the first maximum compaction") \ 1242 \ 1243 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1244 "In the Parallel Old garbage collector maximum compaction for " \ 1245 "a system GC") \ 1246 \ 1247 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1248 "The mean used by the par compact dead wood" \ 1249 "limiter (a number between 0-100).") \ 1250 \ 1251 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1252 "The standard deviation used by the par compact dead wood" \ 1253 "limiter (a number between 0-100).") \ 1254 \ 1255 product(bool, UseParallelOldGCDensePrefix, true, \ 1256 "Use a dense prefix with the Parallel Old garbage collector") \ 1257 \ 1258 product(uintx, ParallelGCThreads, 0, \ 1259 "Number of parallel threads parallel gc will use") \ 1260 \ 1261 develop(bool, ParallelOldGCSplitALot, false, \ 1262 "Provoke splitting (copying data from a young gen space to" \ 1263 "multiple destination spaces)") \ 1264 \ 1265 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1266 "How often to provoke splitting a young gen space") \ 1267 \ 1268 develop(bool, TraceRegionTasksQueuing, false, \ 1269 "Trace the queuing of the region tasks") \ 1270 \ 1271 product(uintx, ConcGCThreads, 0, \ 1272 "Number of threads concurrent gc will use") \ 1273 \ 1274 product(uintx, YoungPLABSize, 4096, \ 1275 "Size of young gen promotion labs (in HeapWords)") \ 1276 \ 1277 product(uintx, OldPLABSize, 1024, \ 1278 "Size of old gen promotion labs (in HeapWords)") \ 1279 \ 1280 product(uintx, GCTaskTimeStampEntries, 200, \ 1281 "Number of time stamp entries per gc worker thread") \ 1282 \ 1283 product(bool, AlwaysTenure, false, \ 1284 "Always tenure objects in eden. (ParallelGC only)") \ 1285 \ 1286 product(bool, NeverTenure, false, \ 1287 "Never tenure objects in eden, May tenure on overflow " \ 1288 "(ParallelGC only)") \ 1289 \ 1290 product(bool, ScavengeBeforeFullGC, true, \ 1291 "Scavenge youngest generation before each full GC, " \ 1292 "used with UseParallelGC") \ 1293 \ 1294 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1295 "Allow scavenges to occur when to_space contains objects.") \ 1296 \ 1297 product(bool, UseConcMarkSweepGC, false, \ 1298 "Use Concurrent Mark-Sweep GC in the old generation") \ 1299 \ 1300 product(bool, ExplicitGCInvokesConcurrent, false, \ 1301 "A System.gc() request invokes a concurrent collection;" \ 1302 " (effective only when UseConcMarkSweepGC)") \ 1303 \ 1304 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1305 "A System.gc() request invokes a concurrent collection and " \ 1306 "also unloads classes during such a concurrent gc cycle " \ 1307 "(effective only when UseConcMarkSweepGC)") \ 1308 \ 1309 product(bool, GCLockerInvokesConcurrent, false, \ 1310 "The exit of a JNI CS necessitating a scavenge also" \ 1311 " kicks off a bkgrd concurrent collection") \ 1312 \ 1313 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1314 "Use Adaptive Free Lists in the CMS generation") \ 1315 \ 1316 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1317 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1318 \ 1319 develop(bool, RotateCMSCollectionTypes, false, \ 1320 "Rotate the CMS collections among concurrent and STW") \ 1321 \ 1322 product(bool, UseCMSBestFit, true, \ 1323 "Use CMS best fit allocation strategy") \ 1324 \ 1325 product(bool, UseCMSCollectionPassing, true, \ 1326 "Use passing of collection from background to foreground") \ 1327 \ 1328 product(bool, UseParNewGC, false, \ 1329 "Use parallel threads in the new generation.") \ 1330 \ 1331 product(bool, ParallelGCVerbose, false, \ 1332 "Verbose output for parallel GC.") \ 1333 \ 1334 product(intx, ParallelGCBufferWastePct, 10, \ 1335 "wasted fraction of parallel allocation buffer.") \ 1336 \ 1337 product(bool, ParallelGCRetainPLAB, true, \ 1338 "Retain parallel allocation buffers across scavenges.") \ 1339 \ 1340 product(intx, TargetPLABWastePct, 10, \ 1341 "target wasted space in last buffer as pct of overall allocation")\ 1342 \ 1343 product(uintx, PLABWeight, 75, \ 1344 "Percentage (0-100) used to weight the current sample when" \ 1345 "computing exponentially decaying average for ResizePLAB.") \ 1346 \ 1347 product(bool, ResizePLAB, true, \ 1348 "Dynamically resize (survivor space) promotion labs") \ 1349 \ 1350 product(bool, PrintPLAB, false, \ 1351 "Print (survivor space) promotion labs sizing decisions") \ 1352 \ 1353 product(intx, ParGCArrayScanChunk, 50, \ 1354 "Scan a subset and push remainder, if array is bigger than this") \ 1355 \ 1356 product(bool, ParGCUseLocalOverflow, false, \ 1357 "Instead of a global overflow list, use local overflow stacks") \ 1358 \ 1359 product(bool, ParGCTrimOverflow, true, \ 1360 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1361 \ 1362 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1363 "Whether we should simulate work queue overflow in ParNew") \ 1364 \ 1365 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1366 "An `interval' counter that determines how frequently " \ 1367 "we simulate overflow; a smaller number increases frequency") \ 1368 \ 1369 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1370 "The desired number of objects to claim from the overflow list") \ 1371 \ 1372 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1373 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1374 "parallel GC.") \ 1375 \ 1376 product(uintx, OldPLABWeight, 50, \ 1377 "Percentage (0-100) used to weight the current sample when" \ 1378 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1379 \ 1380 product(bool, ResizeOldPLAB, true, \ 1381 "Dynamically resize (old gen) promotion labs") \ 1382 \ 1383 product(bool, PrintOldPLAB, false, \ 1384 "Print (old gen) promotion labs sizing decisions") \ 1385 \ 1386 product(uintx, CMSOldPLABMin, 16, \ 1387 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1388 \ 1389 product(uintx, CMSOldPLABMax, 1024, \ 1390 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1391 \ 1392 product(uintx, CMSOldPLABNumRefills, 4, \ 1393 "Nominal number of refills of CMS gen promotion lab cache" \ 1394 " per worker per block size") \ 1395 \ 1396 product(bool, CMSOldPLABResizeQuicker, false, \ 1397 "Whether to react on-the-fly during a scavenge to a sudden" \ 1398 " change in block demand rate") \ 1399 \ 1400 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1401 "The tolerance of the phase-change detector for on-the-fly" \ 1402 " PLAB resizing during a scavenge") \ 1403 \ 1404 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1405 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1406 " during a scavenge") \ 1407 \ 1408 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1409 "The clamping of the gain in the feedback loop for on-the-fly" \ 1410 " PLAB resizing during a scavenge") \ 1411 \ 1412 product(bool, AlwaysPreTouch, false, \ 1413 "It forces all freshly committed pages to be pre-touched.") \ 1414 \ 1415 product(bool, CMSUseOldDefaults, false, \ 1416 "A flag temporarily introduced to allow reverting to some " \ 1417 "older default settings; older as of 6.0") \ 1418 \ 1419 product(intx, CMSYoungGenPerWorker, 16*M, \ 1420 "The amount of young gen chosen by default per GC worker " \ 1421 "thread available") \ 1422 \ 1423 product(bool, GCOverheadReporting, false, \ 1424 "Enables the GC overhead reporting facility") \ 1425 \ 1426 product(intx, GCOverheadReportingPeriodMS, 100, \ 1427 "Reporting period for conc GC overhead reporting, in ms ") \ 1428 \ 1429 product(bool, CMSIncrementalMode, false, \ 1430 "Whether CMS GC should operate in \"incremental\" mode") \ 1431 \ 1432 product(uintx, CMSIncrementalDutyCycle, 10, \ 1433 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1434 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1435 "value") \ 1436 \ 1437 product(bool, CMSIncrementalPacing, true, \ 1438 "Whether the CMS incremental mode duty cycle should be " \ 1439 "automatically adjusted") \ 1440 \ 1441 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1442 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1443 "enabled (a percentage, 0-100)") \ 1444 \ 1445 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1446 "Percentage (0-100) used to add conservatism when computing the " \ 1447 "duty cycle") \ 1448 \ 1449 product(uintx, CMSIncrementalOffset, 0, \ 1450 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1451 " is shifted to the right within the period between young GCs") \ 1452 \ 1453 product(uintx, CMSExpAvgFactor, 50, \ 1454 "Percentage (0-100) used to weight the current sample when" \ 1455 "computing exponential averages for CMS statistics.") \ 1456 \ 1457 product(uintx, CMS_FLSWeight, 75, \ 1458 "Percentage (0-100) used to weight the current sample when" \ 1459 "computing exponentially decating averages for CMS FLS statistics.") \ 1460 \ 1461 product(uintx, CMS_FLSPadding, 1, \ 1462 "The multiple of deviation from mean to use for buffering" \ 1463 "against volatility in free list demand.") \ 1464 \ 1465 product(uintx, FLSCoalescePolicy, 2, \ 1466 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1467 \ 1468 product(bool, FLSAlwaysCoalesceLarge, false, \ 1469 "CMS: Larger free blocks are always available for coalescing") \ 1470 \ 1471 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1472 "CMS: the smaller the percentage the greater the coalition force")\ 1473 \ 1474 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1475 "CMS: the factor by which to inflate estimated demand of small" \ 1476 " block sizes to prevent coalescing with an adjoining block") \ 1477 \ 1478 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1479 "CMS: the factor by which to inflate estimated demand of large" \ 1480 " block sizes to prevent coalescing with an adjoining block") \ 1481 \ 1482 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1483 "CMS: the factor by which to inflate estimated demand of small" \ 1484 " block sizes to prevent splitting to supply demand for smaller" \ 1485 " blocks") \ 1486 \ 1487 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1488 "CMS: the factor by which to inflate estimated demand of large" \ 1489 " block sizes to prevent splitting to supply demand for smaller" \ 1490 " blocks") \ 1491 \ 1492 product(bool, CMSExtrapolateSweep, false, \ 1493 "CMS: cushion for block demand during sweep") \ 1494 \ 1495 product(uintx, CMS_SweepWeight, 75, \ 1496 "Percentage (0-100) used to weight the current sample when " \ 1497 "computing exponentially decaying average for inter-sweep " \ 1498 "duration") \ 1499 \ 1500 product(uintx, CMS_SweepPadding, 1, \ 1501 "The multiple of deviation from mean to use for buffering " \ 1502 "against volatility in inter-sweep duration.") \ 1503 \ 1504 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1505 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1506 "duration exceeds this threhold in milliseconds") \ 1507 \ 1508 develop(bool, CMSTraceIncrementalMode, false, \ 1509 "Trace CMS incremental mode") \ 1510 \ 1511 develop(bool, CMSTraceIncrementalPacing, false, \ 1512 "Trace CMS incremental mode pacing computation") \ 1513 \ 1514 develop(bool, CMSTraceThreadState, false, \ 1515 "Trace the CMS thread state (enable the trace_state() method)") \ 1516 \ 1517 product(bool, CMSClassUnloadingEnabled, false, \ 1518 "Whether class unloading enabled when using CMS GC") \ 1519 \ 1520 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1521 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1522 " for which classes may not be unloaded") \ 1523 \ 1524 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1525 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1526 \ 1527 product(bool, UseCMSCompactAtFullCollection, true, \ 1528 "Use mark sweep compact at full collections") \ 1529 \ 1530 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1531 "Number of CMS full collection done before compaction if > 0") \ 1532 \ 1533 develop(intx, CMSDictionaryChoice, 0, \ 1534 "Use BinaryTreeDictionary as default in the CMS generation") \ 1535 \ 1536 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1537 "Replenish and indexed free list with this number of chunks") \ 1538 \ 1539 product(bool, CMSReplenishIntermediate, true, \ 1540 "Replenish all intermediate free-list caches") \ 1541 \ 1542 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1543 "When satisfying batched demand, splot blocks from the " \ 1544 "IndexedFreeList whose size is a multiple of requested size") \ 1545 \ 1546 product(bool, CMSLoopWarn, false, \ 1547 "Warn in case of excessive CMS looping") \ 1548 \ 1549 develop(bool, CMSOverflowEarlyRestoration, false, \ 1550 "Whether preserved marks should be restored early") \ 1551 \ 1552 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1553 "Size of marking stack") \ 1554 \ 1555 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1556 "Max size of marking stack") \ 1557 \ 1558 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1559 "Whether we should simulate frequent marking stack / work queue" \ 1560 " overflow") \ 1561 \ 1562 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1563 "An `interval' counter that determines how frequently" \ 1564 " we simulate overflow; a smaller number increases frequency") \ 1565 \ 1566 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1567 "(Temporary, subject to experimentation)" \ 1568 "Maximum number of abortable preclean iterations, if > 0") \ 1569 \ 1570 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1571 "(Temporary, subject to experimentation)" \ 1572 "Maximum time in abortable preclean in ms") \ 1573 \ 1574 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1575 "(Temporary, subject to experimentation)" \ 1576 "Nominal minimum work per abortable preclean iteration") \ 1577 \ 1578 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1579 "(Temporary, subject to experimentation)" \ 1580 " Time that we sleep between iterations when not given" \ 1581 " enough work per iteration") \ 1582 \ 1583 product(uintx, CMSRescanMultiple, 32, \ 1584 "Size (in cards) of CMS parallel rescan task") \ 1585 \ 1586 product(uintx, CMSConcMarkMultiple, 32, \ 1587 "Size (in cards) of CMS concurrent MT marking task") \ 1588 \ 1589 product(uintx, CMSRevisitStackSize, 1*M, \ 1590 "Size of CMS KlassKlass revisit stack") \ 1591 \ 1592 product(bool, CMSAbortSemantics, false, \ 1593 "Whether abort-on-overflow semantics is implemented") \ 1594 \ 1595 product(bool, CMSParallelRemarkEnabled, true, \ 1596 "Whether parallel remark enabled (only if ParNewGC)") \ 1597 \ 1598 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1599 "Whether parallel remark of survivor space" \ 1600 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1601 \ 1602 product(bool, CMSPLABRecordAlways, true, \ 1603 "Whether to always record survivor space PLAB bdries" \ 1604 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1605 \ 1606 product(bool, CMSConcurrentMTEnabled, true, \ 1607 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1608 \ 1609 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1610 "Whether concurrent precleaning enabled in perm gen" \ 1611 " (effective only when CMSPrecleaningEnabled is true)") \ 1612 \ 1613 product(bool, CMSPrecleaningEnabled, true, \ 1614 "Whether concurrent precleaning enabled") \ 1615 \ 1616 product(uintx, CMSPrecleanIter, 3, \ 1617 "Maximum number of precleaning iteration passes") \ 1618 \ 1619 product(uintx, CMSPrecleanNumerator, 2, \ 1620 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1621 " ratio") \ 1622 \ 1623 product(uintx, CMSPrecleanDenominator, 3, \ 1624 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1625 " ratio") \ 1626 \ 1627 product(bool, CMSPrecleanRefLists1, true, \ 1628 "Preclean ref lists during (initial) preclean phase") \ 1629 \ 1630 product(bool, CMSPrecleanRefLists2, false, \ 1631 "Preclean ref lists during abortable preclean phase") \ 1632 \ 1633 product(bool, CMSPrecleanSurvivors1, false, \ 1634 "Preclean survivors during (initial) preclean phase") \ 1635 \ 1636 product(bool, CMSPrecleanSurvivors2, true, \ 1637 "Preclean survivors during abortable preclean phase") \ 1638 \ 1639 product(uintx, CMSPrecleanThreshold, 1000, \ 1640 "Don't re-iterate if #dirty cards less than this") \ 1641 \ 1642 product(bool, CMSCleanOnEnter, true, \ 1643 "Clean-on-enter optimization for reducing number of dirty cards") \ 1644 \ 1645 product(uintx, CMSRemarkVerifyVariant, 1, \ 1646 "Choose variant (1,2) of verification following remark") \ 1647 \ 1648 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1649 "If Eden used is below this value, don't try to schedule remark") \ 1650 \ 1651 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1652 "The Eden occupancy % at which to try and schedule remark pause") \ 1653 \ 1654 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1655 "Start sampling Eden top at least before yg occupancy reaches" \ 1656 " 1/<ratio> of the size at which we plan to schedule remark") \ 1657 \ 1658 product(uintx, CMSSamplingGrain, 16*K, \ 1659 "The minimum distance between eden samples for CMS (see above)") \ 1660 \ 1661 product(bool, CMSScavengeBeforeRemark, false, \ 1662 "Attempt scavenge before the CMS remark step") \ 1663 \ 1664 develop(bool, CMSTraceSweeper, false, \ 1665 "Trace some actions of the CMS sweeper") \ 1666 \ 1667 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1668 "Don't drain below this size per parallel worker/thief") \ 1669 \ 1670 product(intx, CMSWaitDuration, 2000, \ 1671 "Time in milliseconds that CMS thread waits for young GC") \ 1672 \ 1673 product(bool, CMSYield, true, \ 1674 "Yield between steps of concurrent mark & sweep") \ 1675 \ 1676 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1677 "Bitmap operations should process at most this many bits" \ 1678 "between yields") \ 1679 \ 1680 product(bool, CMSDumpAtPromotionFailure, false, \ 1681 "Dump useful information about the state of the CMS old " \ 1682 " generation upon a promotion failure.") \ 1683 \ 1684 product(bool, CMSPrintChunksInDump, false, \ 1685 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1686 " more detailed information about the free chunks.") \ 1687 \ 1688 product(bool, CMSPrintObjectsInDump, false, \ 1689 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1690 " more detailed information about the allocated objects.") \ 1691 \ 1692 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1693 "Verify that all refs across the FLS boundary " \ 1694 " are to valid objects") \ 1695 \ 1696 diagnostic(bool, FLSVerifyLists, false, \ 1697 "Do lots of (expensive) FreeListSpace verification") \ 1698 \ 1699 diagnostic(bool, FLSVerifyIndexTable, false, \ 1700 "Do lots of (expensive) FLS index table verification") \ 1701 \ 1702 develop(bool, FLSVerifyDictionary, false, \ 1703 "Do lots of (expensive) FLS dictionary verification") \ 1704 \ 1705 develop(bool, VerifyBlockOffsetArray, false, \ 1706 "Do (expensive!) block offset array verification") \ 1707 \ 1708 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1709 "Maintain _unallocated_block in BlockOffsetArray" \ 1710 " (currently applicable only to CMS collector)") \ 1711 \ 1712 develop(bool, TraceCMSState, false, \ 1713 "Trace the state of the CMS collection") \ 1714 \ 1715 product(intx, RefDiscoveryPolicy, 0, \ 1716 "Whether reference-based(0) or referent-based(1)") \ 1717 \ 1718 product(bool, ParallelRefProcEnabled, false, \ 1719 "Enable parallel reference processing whenever possible") \ 1720 \ 1721 product(bool, ParallelRefProcBalancingEnabled, true, \ 1722 "Enable balancing of reference processing queues") \ 1723 \ 1724 product(intx, CMSTriggerRatio, 80, \ 1725 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1726 "allocated before a CMS collection cycle commences") \ 1727 \ 1728 product(intx, CMSTriggerPermRatio, 80, \ 1729 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1730 "is allocated before a CMS collection cycle commences, that " \ 1731 "also collects the perm generation") \ 1732 \ 1733 product(uintx, CMSBootstrapOccupancy, 50, \ 1734 "Percentage CMS generation occupancy at which to " \ 1735 "initiate CMS collection for bootstrapping collection stats") \ 1736 \ 1737 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1738 "Percentage CMS generation occupancy to start a CMS collection " \ 1739 "cycle. A negative value means that CMSTriggerRatio is used") \ 1740 \ 1741 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1742 "Percentage of the (entire) heap occupancy to start a " \ 1743 "concurrent GC cycle. It us used by GCs that trigger a " \ 1744 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1745 "not just one of the generations (e.g., G1). A value of 0 " \ 1746 "denotes 'do constant GC cycles'.") \ 1747 \ 1748 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1749 "Percentage CMS perm generation occupancy to start a " \ 1750 "CMScollection cycle. A negative value means that " \ 1751 "CMSTriggerPermRatio is used") \ 1752 \ 1753 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1754 "Only use occupancy as a crierion for starting a CMS collection") \ 1755 \ 1756 product(intx, CMSIsTooFullPercentage, 98, \ 1757 "An absolute ceiling above which CMS will always consider the " \ 1758 "perm gen ripe for collection") \ 1759 \ 1760 develop(bool, CMSTestInFreeList, false, \ 1761 "Check if the coalesced range is already in the " \ 1762 "free lists as claimed") \ 1763 \ 1764 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1765 "Check that all the garbage collected was returned to the " \ 1766 "free lists.") \ 1767 \ 1768 notproduct(bool, ScavengeALot, false, \ 1769 "Force scavenge at every Nth exit from the runtime system " \ 1770 "(N=ScavengeALotInterval)") \ 1771 \ 1772 develop(bool, FullGCALot, false, \ 1773 "Force full gc at every Nth exit from the runtime system " \ 1774 "(N=FullGCALotInterval)") \ 1775 \ 1776 notproduct(bool, GCALotAtAllSafepoints, false, \ 1777 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1778 \ 1779 product(bool, HandlePromotionFailure, true, \ 1780 "The youngest generation collection does not require " \ 1781 "a guarantee of full promotion of all live objects.") \ 1782 \ 1783 product(bool, PrintPromotionFailure, false, \ 1784 "Print additional diagnostic information following " \ 1785 " promotion failure") \ 1786 \ 1787 notproduct(bool, PromotionFailureALot, false, \ 1788 "Use promotion failure handling on every youngest generation " \ 1789 "collection") \ 1790 \ 1791 develop(uintx, PromotionFailureALotCount, 1000, \ 1792 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1793 "refill attempts (ParNew) or promotion attempts " \ 1794 "(other young collectors) ") \ 1795 \ 1796 develop(uintx, PromotionFailureALotInterval, 5, \ 1797 "Total collections between promotion failures alot") \ 1798 \ 1799 develop(intx, WorkStealingSleepMillis, 1, \ 1800 "Sleep time when sleep is used for yields") \ 1801 \ 1802 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1803 "Number of yields before a sleep is done during workstealing") \ 1804 \ 1805 develop(uintx, WorkStealingHardSpins, 4096, \ 1806 "Number of iterations in a spin loop between checks on " \ 1807 "time out of hard spin") \ 1808 \ 1809 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1810 "Ratio of hard spins to calls to yield") \ 1811 \ 1812 product(uintx, PreserveMarkStackSize, 1024, \ 1813 "Size for stack used in promotion failure handling") \ 1814 \ 1815 develop(uintx, ObjArrayMarkingStride, 512, \ 1816 "Number of ObjArray elements to push onto the marking stack" \ 1817 "before pushing a continuation entry") \ 1818 \ 1819 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1820 \ 1821 product_pd(bool, ResizeTLAB, \ 1822 "Dynamically resize tlab size for threads") \ 1823 \ 1824 product(bool, ZeroTLAB, false, \ 1825 "Zero out the newly created TLAB") \ 1826 \ 1827 product(bool, FastTLABRefill, true, \ 1828 "Use fast TLAB refill code") \ 1829 \ 1830 product(bool, PrintTLAB, false, \ 1831 "Print various TLAB related information") \ 1832 \ 1833 product(bool, TLABStats, true, \ 1834 "Print various TLAB related information") \ 1835 \ 1836 product(bool, PrintRevisitStats, false, \ 1837 "Print revisit (klass and MDO) stack related information") \ 1838 \ 1839 product_pd(bool, NeverActAsServerClassMachine, \ 1840 "Never act like a server-class machine") \ 1841 \ 1842 product(bool, AlwaysActAsServerClassMachine, false, \ 1843 "Always act like a server-class machine") \ 1844 \ 1845 product_pd(uint64_t, MaxRAM, \ 1846 "Real memory size (in bytes) used to set maximum heap size") \ 1847 \ 1848 product(uintx, ErgoHeapSizeLimit, 0, \ 1849 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1850 "MaxRAM / MaxRAMFraction") \ 1851 \ 1852 product(uintx, MaxRAMFraction, 4, \ 1853 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1854 "size") \ 1855 \ 1856 product(uintx, DefaultMaxRAMFraction, 4, \ 1857 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1858 "size; deprecated: to be renamed to MaxRAMFraction") \ 1859 \ 1860 product(uintx, MinRAMFraction, 2, \ 1861 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1862 "size on systems with small physical memory size") \ 1863 \ 1864 product(uintx, InitialRAMFraction, 64, \ 1865 "Fraction (1/n) of real memory used for initial heap size") \ 1866 \ 1867 product(bool, UseAutoGCSelectPolicy, false, \ 1868 "Use automatic collection selection policy") \ 1869 \ 1870 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1871 "Automatic GC selection pause threshhold in ms") \ 1872 \ 1873 product(bool, UseAdaptiveSizePolicy, true, \ 1874 "Use adaptive generation sizing policies") \ 1875 \ 1876 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1877 "Use adaptive survivor sizing policies") \ 1878 \ 1879 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1880 "Use adaptive young-old sizing policies at minor collections") \ 1881 \ 1882 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1883 "Use adaptive young-old sizing policies at major collections") \ 1884 \ 1885 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1886 "Use statistics from System.GC for adaptive size policy") \ 1887 \ 1888 product(bool, UseAdaptiveGCBoundary, false, \ 1889 "Allow young-old boundary to move") \ 1890 \ 1891 develop(bool, TraceAdaptiveGCBoundary, false, \ 1892 "Trace young-old boundary moves") \ 1893 \ 1894 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1895 "Resize the virtual spaces of the young or old generations") \ 1896 \ 1897 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1898 "Policy for changeing generation size for throughput goals") \ 1899 \ 1900 product(uintx, AdaptiveSizePausePolicy, 0, \ 1901 "Policy for changing generation size for pause goals") \ 1902 \ 1903 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1904 "Adjust tenured generation to achive a minor pause goal") \ 1905 \ 1906 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1907 "Adjust young generation to achive a major pause goal") \ 1908 \ 1909 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1910 "Number of steps where heuristics is used before data is used") \ 1911 \ 1912 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1913 "Number of collections before the adaptive sizing is started") \ 1914 \ 1915 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1916 "Collecton interval for printing information; zero => never") \ 1917 \ 1918 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1919 "Use adaptive minimum footprint as a goal") \ 1920 \ 1921 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1922 "Weight given to exponential resizing, between 0 and 100") \ 1923 \ 1924 product(uintx, AdaptiveTimeWeight, 25, \ 1925 "Weight given to time in adaptive policy, between 0 and 100") \ 1926 \ 1927 product(uintx, PausePadding, 1, \ 1928 "How much buffer to keep for pause time") \ 1929 \ 1930 product(uintx, PromotedPadding, 3, \ 1931 "How much buffer to keep for promotion failure") \ 1932 \ 1933 product(uintx, SurvivorPadding, 3, \ 1934 "How much buffer to keep for survivor overflow") \ 1935 \ 1936 product(uintx, AdaptivePermSizeWeight, 20, \ 1937 "Weight for perm gen exponential resizing, between 0 and 100") \ 1938 \ 1939 product(uintx, PermGenPadding, 3, \ 1940 "How much buffer to keep for perm gen sizing") \ 1941 \ 1942 product(uintx, ThresholdTolerance, 10, \ 1943 "Allowed collection cost difference between generations") \ 1944 \ 1945 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1946 "If collection costs are within margin, reduce both by full " \ 1947 "delta") \ 1948 \ 1949 product(uintx, YoungGenerationSizeIncrement, 20, \ 1950 "Adaptive size percentage change in young generation") \ 1951 \ 1952 product(uintx, YoungGenerationSizeSupplement, 80, \ 1953 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1954 \ 1955 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1956 "Decay factor to YoungedGenerationSizeSupplement") \ 1957 \ 1958 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1959 "Adaptive size percentage change in tenured generation") \ 1960 \ 1961 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1962 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1963 \ 1964 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1965 "Decay factor to TenuredGenerationSizeIncrement") \ 1966 \ 1967 product(uintx, MaxGCPauseMillis, max_uintx, \ 1968 "Adaptive size policy maximum GC pause time goal in msec, " \ 1969 "or (G1 Only) the max. GC time per MMU time slice") \ 1970 \ 1971 product(uintx, GCPauseIntervalMillis, 0, \ 1972 "Time slice for MMU specification") \ 1973 \ 1974 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1975 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1976 \ 1977 product(uintx, GCTimeRatio, 99, \ 1978 "Adaptive size policy application time to GC time ratio") \ 1979 \ 1980 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1981 "Adaptive size scale down factor for shrinking") \ 1982 \ 1983 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1984 "Adaptive size decays the major cost for long major intervals") \ 1985 \ 1986 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1987 "Time scale over which major costs decay") \ 1988 \ 1989 product(uintx, MinSurvivorRatio, 3, \ 1990 "Minimum ratio of young generation/survivor space size") \ 1991 \ 1992 product(uintx, InitialSurvivorRatio, 8, \ 1993 "Initial ratio of eden/survivor space size") \ 1994 \ 1995 product(uintx, BaseFootPrintEstimate, 256*M, \ 1996 "Estimate of footprint other than Java Heap") \ 1997 \ 1998 product(bool, UseGCOverheadLimit, true, \ 1999 "Use policy to limit of proportion of time spent in GC " \ 2000 "before an OutOfMemory error is thrown") \ 2001 \ 2002 product(uintx, GCTimeLimit, 98, \ 2003 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2004 "error is thrown (used with GCHeapFreeLimit)") \ 2005 \ 2006 product(uintx, GCHeapFreeLimit, 2, \ 2007 "Minimum percentage of free space after a full GC before an " \ 2008 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2009 \ 2010 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2011 "Number of consecutive collections before gc time limit fires") \ 2012 \ 2013 product(bool, PrintAdaptiveSizePolicy, false, \ 2014 "Print information about AdaptiveSizePolicy") \ 2015 \ 2016 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2017 "How far ahead to prefetch destination area (<= 0 means off)") \ 2018 \ 2019 product(intx, PrefetchScanIntervalInBytes, -1, \ 2020 "How far ahead to prefetch scan area (<= 0 means off)") \ 2021 \ 2022 product(intx, PrefetchFieldsAhead, -1, \ 2023 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2024 \ 2025 develop(bool, UsePrefetchQueue, true, \ 2026 "Use the prefetch queue during PS promotion") \ 2027 \ 2028 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2029 "Verify system before exiting") \ 2030 \ 2031 diagnostic(bool, VerifyBeforeGC, false, \ 2032 "Verify memory system before GC") \ 2033 \ 2034 diagnostic(bool, VerifyAfterGC, false, \ 2035 "Verify memory system after GC") \ 2036 \ 2037 diagnostic(bool, VerifyDuringGC, false, \ 2038 "Verify memory system during GC (between phases)") \ 2039 \ 2040 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2041 "Enable parallel memory system verification") \ 2042 \ 2043 diagnostic(bool, DeferInitialCardMark, false, \ 2044 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2045 "may arise from new_pre_store_barrier") \ 2046 \ 2047 diagnostic(bool, VerifyRememberedSets, false, \ 2048 "Verify GC remembered sets") \ 2049 \ 2050 diagnostic(bool, VerifyObjectStartArray, true, \ 2051 "Verify GC object start array if verify before/after") \ 2052 \ 2053 product(bool, DisableExplicitGC, false, \ 2054 "Tells whether calling System.gc() does a full GC") \ 2055 \ 2056 notproduct(bool, CheckMemoryInitialization, false, \ 2057 "Checks memory initialization") \ 2058 \ 2059 product(bool, CollectGen0First, false, \ 2060 "Collect youngest generation before each full GC") \ 2061 \ 2062 diagnostic(bool, BindCMSThreadToCPU, false, \ 2063 "Bind CMS Thread to CPU if possible") \ 2064 \ 2065 diagnostic(uintx, CPUForCMSThread, 0, \ 2066 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2067 \ 2068 product(bool, BindGCTaskThreadsToCPUs, false, \ 2069 "Bind GCTaskThreads to CPUs if possible") \ 2070 \ 2071 product(bool, UseGCTaskAffinity, false, \ 2072 "Use worker affinity when asking for GCTasks") \ 2073 \ 2074 product(uintx, ProcessDistributionStride, 4, \ 2075 "Stride through processors when distributing processes") \ 2076 \ 2077 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2078 "number of times the coordinator GC thread will sleep while " \ 2079 "yielding before giving up and resuming GC") \ 2080 \ 2081 product(uintx, CMSYieldSleepCount, 0, \ 2082 "number of times a GC thread (minus the coordinator) " \ 2083 "will sleep while yielding before giving up and resuming GC") \ 2084 \ 2085 /* gc tracing */ \ 2086 manageable(bool, PrintGC, false, \ 2087 "Print message at garbage collect") \ 2088 \ 2089 manageable(bool, PrintGCDetails, false, \ 2090 "Print more details at garbage collect") \ 2091 \ 2092 manageable(bool, PrintGCDateStamps, false, \ 2093 "Print date stamps at garbage collect") \ 2094 \ 2095 manageable(bool, PrintGCTimeStamps, false, \ 2096 "Print timestamps at garbage collect") \ 2097 \ 2098 product(bool, PrintGCTaskTimeStamps, false, \ 2099 "Print timestamps for individual gc worker thread tasks") \ 2100 \ 2101 develop(intx, ConcGCYieldTimeout, 0, \ 2102 "If non-zero, assert that GC threads yield within this # of ms.") \ 2103 \ 2104 notproduct(bool, TraceMarkSweep, false, \ 2105 "Trace mark sweep") \ 2106 \ 2107 product(bool, PrintReferenceGC, false, \ 2108 "Print times spent handling reference objects during GC " \ 2109 " (enabled only when PrintGCDetails)") \ 2110 \ 2111 develop(bool, TraceReferenceGC, false, \ 2112 "Trace handling of soft/weak/final/phantom references") \ 2113 \ 2114 develop(bool, TraceFinalizerRegistration, false, \ 2115 "Trace registration of final references") \ 2116 \ 2117 notproduct(bool, TraceScavenge, false, \ 2118 "Trace scavenge") \ 2119 \ 2120 product_rw(bool, TraceClassLoading, false, \ 2121 "Trace all classes loaded") \ 2122 \ 2123 product(bool, TraceClassLoadingPreorder, false, \ 2124 "Trace all classes loaded in order referenced (not loaded)") \ 2125 \ 2126 product_rw(bool, TraceClassUnloading, false, \ 2127 "Trace unloading of classes") \ 2128 \ 2129 product_rw(bool, TraceLoaderConstraints, false, \ 2130 "Trace loader constraints") \ 2131 \ 2132 product(bool, TraceGen0Time, false, \ 2133 "Trace accumulated time for Gen 0 collection") \ 2134 \ 2135 product(bool, TraceGen1Time, false, \ 2136 "Trace accumulated time for Gen 1 collection") \ 2137 \ 2138 product(bool, PrintTenuringDistribution, false, \ 2139 "Print tenuring age information") \ 2140 \ 2141 product_rw(bool, PrintHeapAtGC, false, \ 2142 "Print heap layout before and after each GC") \ 2143 \ 2144 product_rw(bool, PrintHeapAtGCExtended, false, \ 2145 "Prints extended information about the layout of the heap " \ 2146 "when -XX:+PrintHeapAtGC is set") \ 2147 \ 2148 product(bool, PrintHeapAtSIGBREAK, true, \ 2149 "Print heap layout in response to SIGBREAK") \ 2150 \ 2151 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2152 "Print a class histogram before any major stop-world GC") \ 2153 \ 2154 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2155 "Print a class histogram after any major stop-world GC") \ 2156 \ 2157 manageable(bool, PrintClassHistogram, false, \ 2158 "Print a histogram of class instances") \ 2159 \ 2160 develop(bool, TraceWorkGang, false, \ 2161 "Trace activities of work gangs") \ 2162 \ 2163 product(bool, TraceParallelOldGCTasks, false, \ 2164 "Trace multithreaded GC activity") \ 2165 \ 2166 develop(bool, TraceBlockOffsetTable, false, \ 2167 "Print BlockOffsetTable maps") \ 2168 \ 2169 develop(bool, TraceCardTableModRefBS, false, \ 2170 "Print CardTableModRefBS maps") \ 2171 \ 2172 develop(bool, TraceGCTaskManager, false, \ 2173 "Trace actions of the GC task manager") \ 2174 \ 2175 develop(bool, TraceGCTaskQueue, false, \ 2176 "Trace actions of the GC task queues") \ 2177 \ 2178 develop(bool, TraceGCTaskThread, false, \ 2179 "Trace actions of the GC task threads") \ 2180 \ 2181 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2182 "Print the time taken by each parallel old gc phase." \ 2183 "PrintGCDetails must also be enabled.") \ 2184 \ 2185 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2186 "Trace parallel old gc marking phase") \ 2187 \ 2188 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2189 "Trace parallel old gc summary phase") \ 2190 \ 2191 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2192 "Trace parallel old gc compaction phase") \ 2193 \ 2194 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2195 "Trace parallel old gc dense prefix computation") \ 2196 \ 2197 develop(bool, IgnoreLibthreadGPFault, false, \ 2198 "Suppress workaround for libthread GP fault") \ 2199 \ 2200 product(bool, PrintJNIGCStalls, false, \ 2201 "Print diagnostic message when GC is stalled" \ 2202 "by JNI critical section") \ 2203 \ 2204 /* JVMTI heap profiling */ \ 2205 \ 2206 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2207 "Trace JVMTI object tagging calls") \ 2208 \ 2209 diagnostic(bool, VerifyBeforeIteration, false, \ 2210 "Verify memory system before JVMTI iteration") \ 2211 \ 2212 /* compiler interface */ \ 2213 \ 2214 develop(bool, CIPrintCompilerName, false, \ 2215 "when CIPrint is active, print the name of the active compiler") \ 2216 \ 2217 develop(bool, CIPrintCompileQueue, false, \ 2218 "display the contents of the compile queue whenever a " \ 2219 "compilation is enqueued") \ 2220 \ 2221 develop(bool, CIPrintRequests, false, \ 2222 "display every request for compilation") \ 2223 \ 2224 product(bool, CITime, false, \ 2225 "collect timing information for compilation") \ 2226 \ 2227 develop(bool, CITimeEach, false, \ 2228 "display timing information after each successful compilation") \ 2229 \ 2230 develop(bool, CICountOSR, true, \ 2231 "use a separate counter when assigning ids to osr compilations") \ 2232 \ 2233 develop(bool, CICompileNatives, true, \ 2234 "compile native methods if supported by the compiler") \ 2235 \ 2236 develop_pd(bool, CICompileOSR, \ 2237 "compile on stack replacement methods if supported by the " \ 2238 "compiler") \ 2239 \ 2240 develop(bool, CIPrintMethodCodes, false, \ 2241 "print method bytecodes of the compiled code") \ 2242 \ 2243 develop(bool, CIPrintTypeFlow, false, \ 2244 "print the results of ciTypeFlow analysis") \ 2245 \ 2246 develop(bool, CITraceTypeFlow, false, \ 2247 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2248 \ 2249 develop(intx, CICloneLoopTestLimit, 100, \ 2250 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2251 \ 2252 /* temp diagnostics */ \ 2253 \ 2254 diagnostic(bool, TraceRedundantCompiles, false, \ 2255 "Have compile broker print when a request already in the queue is"\ 2256 " requested again") \ 2257 \ 2258 diagnostic(bool, InitialCompileFast, false, \ 2259 "Initial compile at CompLevel_fast_compile") \ 2260 \ 2261 diagnostic(bool, InitialCompileReallyFast, false, \ 2262 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2263 \ 2264 diagnostic(bool, FullProfileOnReInterpret, true, \ 2265 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2266 \ 2267 /* compiler */ \ 2268 \ 2269 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2270 "Number of compiler threads to run") \ 2271 \ 2272 product(intx, CompilationPolicyChoice, 0, \ 2273 "which compilation policy (0/1)") \ 2274 \ 2275 develop(bool, UseStackBanging, true, \ 2276 "use stack banging for stack overflow checks (required for " \ 2277 "proper StackOverflow handling; disable only to measure cost " \ 2278 "of stackbanging)") \ 2279 \ 2280 develop(bool, Use24BitFPMode, true, \ 2281 "Set 24-bit FPU mode on a per-compile basis ") \ 2282 \ 2283 develop(bool, Use24BitFP, true, \ 2284 "use FP instructions that produce 24-bit precise results") \ 2285 \ 2286 develop(bool, UseStrictFP, true, \ 2287 "use strict fp if modifier strictfp is set") \ 2288 \ 2289 develop(bool, GenerateSynchronizationCode, true, \ 2290 "generate locking/unlocking code for synchronized methods and " \ 2291 "monitors") \ 2292 \ 2293 develop(bool, GenerateCompilerNullChecks, true, \ 2294 "Generate explicit null checks for loads/stores/calls") \ 2295 \ 2296 develop(bool, GenerateRangeChecks, true, \ 2297 "Generate range checks for array accesses") \ 2298 \ 2299 develop_pd(bool, ImplicitNullChecks, \ 2300 "generate code for implicit null checks") \ 2301 \ 2302 product(bool, PrintSafepointStatistics, false, \ 2303 "print statistics about safepoint synchronization") \ 2304 \ 2305 product(intx, PrintSafepointStatisticsCount, 300, \ 2306 "total number of safepoint statistics collected " \ 2307 "before printing them out") \ 2308 \ 2309 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2310 "print safepoint statistics only when safepoint takes" \ 2311 " more than PrintSafepointSatisticsTimeout in millis") \ 2312 \ 2313 product(bool, TraceSafepointCleanupTime, false, \ 2314 "print the break down of clean up tasks performed during" \ 2315 " safepoint") \ 2316 \ 2317 develop(bool, InlineAccessors, true, \ 2318 "inline accessor methods (get/set)") \ 2319 \ 2320 product(bool, Inline, true, \ 2321 "enable inlining") \ 2322 \ 2323 product(bool, ClipInlining, true, \ 2324 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2325 \ 2326 develop(bool, UseCHA, true, \ 2327 "enable CHA") \ 2328 \ 2329 product(bool, UseTypeProfile, true, \ 2330 "Check interpreter profile for historically monomorphic calls") \ 2331 \ 2332 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2333 "% of major receiver type to all profiled receivers") \ 2334 \ 2335 notproduct(bool, TimeCompiler, false, \ 2336 "time the compiler") \ 2337 \ 2338 notproduct(bool, TimeCompiler2, false, \ 2339 "detailed time the compiler (requires +TimeCompiler)") \ 2340 \ 2341 diagnostic(bool, PrintInlining, false, \ 2342 "prints inlining optimizations") \ 2343 \ 2344 diagnostic(bool, PrintIntrinsics, false, \ 2345 "prints attempted and successful inlining of intrinsics") \ 2346 \ 2347 product(bool, UseCountLeadingZerosInstruction, false, \ 2348 "Use count leading zeros instruction") \ 2349 \ 2350 product(bool, UsePopCountInstruction, false, \ 2351 "Use population count instruction") \ 2352 \ 2353 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2354 "do not expand intrinsics whose (internal) names appear here") \ 2355 \ 2356 develop(bool, StressReflectiveCode, false, \ 2357 "Use inexact types at allocations, etc., to test reflection") \ 2358 \ 2359 develop(bool, EagerInitialization, false, \ 2360 "Eagerly initialize classes if possible") \ 2361 \ 2362 develop(bool, TraceMethodReplacement, false, \ 2363 "Print when methods are replaced do to recompilation") \ 2364 \ 2365 develop(bool, PrintMethodFlushing, false, \ 2366 "print the nmethods being flushed") \ 2367 \ 2368 notproduct(bool, LogMultipleMutexLocking, false, \ 2369 "log locking and unlocking of mutexes (only if multiple locks " \ 2370 "are held)") \ 2371 \ 2372 develop(bool, UseRelocIndex, false, \ 2373 "use an index to speed random access to relocations") \ 2374 \ 2375 develop(bool, StressCodeBuffers, false, \ 2376 "Exercise code buffer expansion and other rare state changes") \ 2377 \ 2378 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2379 "Generate extra debugging info for non-safepoints in nmethods") \ 2380 \ 2381 diagnostic(bool, DebugInlinedCalls, true, \ 2382 "If false, restricts profiled locations to the root method only") \ 2383 \ 2384 product(bool, PrintVMOptions, trueInDebug, \ 2385 "Print flags that appeared on the command line") \ 2386 \ 2387 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2388 "Ignore unrecognized VM options") \ 2389 \ 2390 product(bool, PrintCommandLineFlags, false, \ 2391 "Print flags specified on command line or set by ergonomics") \ 2392 \ 2393 product(bool, PrintFlagsInitial, false, \ 2394 "Print all VM flags before argument processing and exit VM") \ 2395 \ 2396 product(bool, PrintFlagsFinal, false, \ 2397 "Print all VM flags after argument and ergonomic processing") \ 2398 \ 2399 diagnostic(bool, SerializeVMOutput, true, \ 2400 "Use a mutex to serialize output to tty and hotspot.log") \ 2401 \ 2402 diagnostic(bool, DisplayVMOutput, true, \ 2403 "Display all VM output on the tty, independently of LogVMOutput") \ 2404 \ 2405 diagnostic(bool, LogVMOutput, trueInDebug, \ 2406 "Save VM output to hotspot.log, or to LogFile") \ 2407 \ 2408 diagnostic(ccstr, LogFile, NULL, \ 2409 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2410 \ 2411 product(ccstr, ErrorFile, NULL, \ 2412 "If an error occurs, save the error data to this file " \ 2413 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2414 \ 2415 product(bool, DisplayVMOutputToStderr, false, \ 2416 "If DisplayVMOutput is true, display all VM output to stderr") \ 2417 \ 2418 product(bool, DisplayVMOutputToStdout, false, \ 2419 "If DisplayVMOutput is true, display all VM output to stdout") \ 2420 \ 2421 product(bool, UseHeavyMonitors, false, \ 2422 "use heavyweight instead of lightweight Java monitors") \ 2423 \ 2424 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2425 "print histogram of the symbol table") \ 2426 \ 2427 notproduct(bool, ExitVMOnVerifyError, false, \ 2428 "standard exit from VM if bytecode verify error " \ 2429 "(only in debug mode)") \ 2430 \ 2431 notproduct(ccstr, AbortVMOnException, NULL, \ 2432 "Call fatal if this exception is thrown. Example: " \ 2433 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2434 \ 2435 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2436 "Call fatal if the exception pointed by AbortVMOnException " \ 2437 "has this message.") \ 2438 \ 2439 develop(bool, DebugVtables, false, \ 2440 "add debugging code to vtable dispatch") \ 2441 \ 2442 develop(bool, PrintVtables, false, \ 2443 "print vtables when printing klass") \ 2444 \ 2445 notproduct(bool, PrintVtableStats, false, \ 2446 "print vtables stats at end of run") \ 2447 \ 2448 develop(bool, TraceCreateZombies, false, \ 2449 "trace creation of zombie nmethods") \ 2450 \ 2451 notproduct(bool, IgnoreLockingAssertions, false, \ 2452 "disable locking assertions (for speed)") \ 2453 \ 2454 notproduct(bool, VerifyLoopOptimizations, false, \ 2455 "verify major loop optimizations") \ 2456 \ 2457 product(bool, RangeCheckElimination, true, \ 2458 "Split loop iterations to eliminate range checks") \ 2459 \ 2460 develop_pd(bool, UncommonNullCast, \ 2461 "track occurrences of null in casts; adjust compiler tactics") \ 2462 \ 2463 develop(bool, TypeProfileCasts, true, \ 2464 "treat casts like calls for purposes of type profiling") \ 2465 \ 2466 develop(bool, MonomorphicArrayCheck, true, \ 2467 "Uncommon-trap array store checks that require full type check") \ 2468 \ 2469 diagnostic(bool, ProfileDynamicTypes, true, \ 2470 "do extra type profiling and use it more aggressively") \ 2471 \ 2472 develop(bool, DelayCompilationDuringStartup, true, \ 2473 "Delay invoking the compiler until main application class is " \ 2474 "loaded") \ 2475 \ 2476 develop(bool, CompileTheWorld, false, \ 2477 "Compile all methods in all classes in bootstrap class path " \ 2478 "(stress test)") \ 2479 \ 2480 develop(bool, CompileTheWorldPreloadClasses, true, \ 2481 "Preload all classes used by a class before start loading") \ 2482 \ 2483 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2484 "Compile all methods although class initializer failed") \ 2485 \ 2486 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2487 "Force a safepoint every n compiles so sweeper can keep up") \ 2488 \ 2489 develop(bool, TraceIterativeGVN, false, \ 2490 "Print progress during Iterative Global Value Numbering") \ 2491 \ 2492 develop(bool, FillDelaySlots, true, \ 2493 "Fill delay slots (on SPARC only)") \ 2494 \ 2495 develop(bool, VerifyIterativeGVN, false, \ 2496 "Verify Def-Use modifications during sparse Iterative Global " \ 2497 "Value Numbering") \ 2498 \ 2499 notproduct(bool, TracePhaseCCP, false, \ 2500 "Print progress during Conditional Constant Propagation") \ 2501 \ 2502 develop(bool, TimeLivenessAnalysis, false, \ 2503 "Time computation of bytecode liveness analysis") \ 2504 \ 2505 develop(bool, TraceLivenessGen, false, \ 2506 "Trace the generation of liveness analysis information") \ 2507 \ 2508 notproduct(bool, TraceLivenessQuery, false, \ 2509 "Trace queries of liveness analysis information") \ 2510 \ 2511 notproduct(bool, CollectIndexSetStatistics, false, \ 2512 "Collect information about IndexSets") \ 2513 \ 2514 develop(bool, PrintDominators, false, \ 2515 "Print out dominator trees for GVN") \ 2516 \ 2517 develop(bool, UseLoopSafepoints, true, \ 2518 "Generate Safepoint nodes in every loop") \ 2519 \ 2520 notproduct(bool, TraceCISCSpill, false, \ 2521 "Trace allocators use of cisc spillable instructions") \ 2522 \ 2523 notproduct(bool, TraceSpilling, false, \ 2524 "Trace spilling") \ 2525 \ 2526 product(bool, SplitIfBlocks, true, \ 2527 "Clone compares and control flow through merge points to fold " \ 2528 "some branches") \ 2529 \ 2530 develop(intx, FastAllocateSizeLimit, 128*K, \ 2531 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2532 "Inline allocations larger than this in doublewords must go slow")\ 2533 \ 2534 product(bool, AggressiveOpts, false, \ 2535 "Enable aggressive optimizations - see arguments.cpp") \ 2536 \ 2537 product(bool, UseStringCache, false, \ 2538 "Enable String cache capabilities on String.java") \ 2539 \ 2540 /* statistics */ \ 2541 develop(bool, CountCompiledCalls, false, \ 2542 "counts method invocations") \ 2543 \ 2544 notproduct(bool, CountRuntimeCalls, false, \ 2545 "counts VM runtime calls") \ 2546 \ 2547 develop(bool, CountJNICalls, false, \ 2548 "counts jni method invocations") \ 2549 \ 2550 notproduct(bool, CountJVMCalls, false, \ 2551 "counts jvm method invocations") \ 2552 \ 2553 notproduct(bool, CountRemovableExceptions, false, \ 2554 "count exceptions that could be replaced by branches due to " \ 2555 "inlining") \ 2556 \ 2557 notproduct(bool, ICMissHistogram, false, \ 2558 "produce histogram of IC misses") \ 2559 \ 2560 notproduct(bool, PrintClassStatistics, false, \ 2561 "prints class statistics at end of run") \ 2562 \ 2563 notproduct(bool, PrintMethodStatistics, false, \ 2564 "prints method statistics at end of run") \ 2565 \ 2566 /* interpreter */ \ 2567 develop(bool, ClearInterpreterLocals, false, \ 2568 "Always clear local variables of interpreter activations upon " \ 2569 "entry") \ 2570 \ 2571 product_pd(bool, RewriteBytecodes, \ 2572 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2573 \ 2574 product_pd(bool, RewriteFrequentPairs, \ 2575 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2576 \ 2577 diagnostic(bool, PrintInterpreter, false, \ 2578 "Prints the generated interpreter code") \ 2579 \ 2580 product(bool, UseInterpreter, true, \ 2581 "Use interpreter for non-compiled methods") \ 2582 \ 2583 develop(bool, UseFastSignatureHandlers, true, \ 2584 "Use fast signature handlers for native calls") \ 2585 \ 2586 develop(bool, UseV8InstrsOnly, false, \ 2587 "Use SPARC-V8 Compliant instruction subset") \ 2588 \ 2589 product(bool, UseNiagaraInstrs, false, \ 2590 "Use Niagara-efficient instruction subset") \ 2591 \ 2592 develop(bool, UseCASForSwap, false, \ 2593 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2594 \ 2595 product(bool, UseLoopCounter, true, \ 2596 "Increment invocation counter on backward branch") \ 2597 \ 2598 product(bool, UseFastEmptyMethods, true, \ 2599 "Use fast method entry code for empty methods") \ 2600 \ 2601 product(bool, UseFastAccessorMethods, true, \ 2602 "Use fast method entry code for accessor methods") \ 2603 \ 2604 product_pd(bool, UseOnStackReplacement, \ 2605 "Use on stack replacement, calls runtime if invoc. counter " \ 2606 "overflows in loop") \ 2607 \ 2608 notproduct(bool, TraceOnStackReplacement, false, \ 2609 "Trace on stack replacement") \ 2610 \ 2611 develop(bool, PoisonOSREntry, true, \ 2612 "Detect abnormal calls to OSR code") \ 2613 \ 2614 product_pd(bool, PreferInterpreterNativeStubs, \ 2615 "Use always interpreter stubs for native methods invoked via " \ 2616 "interpreter") \ 2617 \ 2618 develop(bool, CountBytecodes, false, \ 2619 "Count number of bytecodes executed") \ 2620 \ 2621 develop(bool, PrintBytecodeHistogram, false, \ 2622 "Print histogram of the executed bytecodes") \ 2623 \ 2624 develop(bool, PrintBytecodePairHistogram, false, \ 2625 "Print histogram of the executed bytecode pairs") \ 2626 \ 2627 diagnostic(bool, PrintSignatureHandlers, false, \ 2628 "Print code generated for native method signature handlers") \ 2629 \ 2630 develop(bool, VerifyOops, false, \ 2631 "Do plausibility checks for oops") \ 2632 \ 2633 develop(bool, CheckUnhandledOops, false, \ 2634 "Check for unhandled oops in VM code") \ 2635 \ 2636 develop(bool, VerifyJNIFields, trueInDebug, \ 2637 "Verify jfieldIDs for instance fields") \ 2638 \ 2639 notproduct(bool, VerifyJNIEnvThread, false, \ 2640 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2641 "from JNI") \ 2642 \ 2643 develop(bool, VerifyFPU, false, \ 2644 "Verify FPU state (check for NaN's, etc.)") \ 2645 \ 2646 develop(bool, VerifyThread, false, \ 2647 "Watch the thread register for corruption (SPARC only)") \ 2648 \ 2649 develop(bool, VerifyActivationFrameSize, false, \ 2650 "Verify that activation frame didn't become smaller than its " \ 2651 "minimal size") \ 2652 \ 2653 develop(bool, TraceFrequencyInlining, false, \ 2654 "Trace frequency based inlining") \ 2655 \ 2656 notproduct(bool, TraceTypeProfile, false, \ 2657 "Trace type profile") \ 2658 \ 2659 develop_pd(bool, InlineIntrinsics, \ 2660 "Inline intrinsics that can be statically resolved") \ 2661 \ 2662 product_pd(bool, ProfileInterpreter, \ 2663 "Profile at the bytecode level during interpretation") \ 2664 \ 2665 develop_pd(bool, ProfileTraps, \ 2666 "Profile deoptimization traps at the bytecode level") \ 2667 \ 2668 product(intx, ProfileMaturityPercentage, 20, \ 2669 "number of method invocations/branches (expressed as % of " \ 2670 "CompileThreshold) before using the method's profile") \ 2671 \ 2672 develop(bool, PrintMethodData, false, \ 2673 "Print the results of +ProfileInterpreter at end of run") \ 2674 \ 2675 develop(bool, VerifyDataPointer, trueInDebug, \ 2676 "Verify the method data pointer during interpreter profiling") \ 2677 \ 2678 develop(bool, VerifyCompiledCode, false, \ 2679 "Include miscellaneous runtime verifications in nmethod code; " \ 2680 "default off because it disturbs nmethod size heuristics") \ 2681 \ 2682 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2683 "Manually make GC thread crash then dump java stack trace; " \ 2684 "Test only") \ 2685 \ 2686 /* compilation */ \ 2687 product(bool, UseCompiler, true, \ 2688 "use compilation") \ 2689 \ 2690 develop(bool, TraceCompilationPolicy, false, \ 2691 "Trace compilation policy") \ 2692 \ 2693 develop(bool, TimeCompilationPolicy, false, \ 2694 "Time the compilation policy") \ 2695 \ 2696 product(bool, UseCounterDecay, true, \ 2697 "adjust recompilation counters") \ 2698 \ 2699 develop(intx, CounterHalfLifeTime, 30, \ 2700 "half-life time of invocation counters (in secs)") \ 2701 \ 2702 develop(intx, CounterDecayMinIntervalLength, 500, \ 2703 "Min. ms. between invocation of CounterDecay") \ 2704 \ 2705 product(bool, AlwaysCompileLoopMethods, false, \ 2706 "when using recompilation, never interpret methods " \ 2707 "containing loops") \ 2708 \ 2709 product(bool, DontCompileHugeMethods, true, \ 2710 "don't compile methods > HugeMethodLimit") \ 2711 \ 2712 /* Bytecode escape analysis estimation. */ \ 2713 product(bool, EstimateArgEscape, true, \ 2714 "Analyze bytecodes to estimate escape state of arguments") \ 2715 \ 2716 product(intx, BCEATraceLevel, 0, \ 2717 "How much tracing to do of bytecode escape analysis estimates") \ 2718 \ 2719 product(intx, MaxBCEAEstimateLevel, 5, \ 2720 "Maximum number of nested calls that are analyzed by BC EA.") \ 2721 \ 2722 product(intx, MaxBCEAEstimateSize, 150, \ 2723 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2724 \ 2725 product(intx, AllocatePrefetchStyle, 1, \ 2726 "0 = no prefetch, " \ 2727 "1 = prefetch instructions for each allocation, " \ 2728 "2 = use TLAB watermark to gate allocation prefetch, " \ 2729 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2730 \ 2731 product(intx, AllocatePrefetchDistance, -1, \ 2732 "Distance to prefetch ahead of allocation pointer") \ 2733 \ 2734 product(intx, AllocatePrefetchLines, 1, \ 2735 "Number of lines to prefetch ahead of allocation pointer") \ 2736 \ 2737 product(intx, AllocatePrefetchStepSize, 16, \ 2738 "Step size in bytes of sequential prefetch instructions") \ 2739 \ 2740 product(intx, AllocatePrefetchInstr, 0, \ 2741 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2742 \ 2743 product(intx, ReadPrefetchInstr, 0, \ 2744 "Prefetch instruction to prefetch ahead") \ 2745 \ 2746 /* deoptimization */ \ 2747 develop(bool, TraceDeoptimization, false, \ 2748 "Trace deoptimization") \ 2749 \ 2750 develop(bool, DebugDeoptimization, false, \ 2751 "Tracing various information while debugging deoptimization") \ 2752 \ 2753 product(intx, SelfDestructTimer, 0, \ 2754 "Will cause VM to terminate after a given time (in minutes) " \ 2755 "(0 means off)") \ 2756 \ 2757 product(intx, MaxJavaStackTraceDepth, 1024, \ 2758 "Max. no. of lines in the stack trace for Java exceptions " \ 2759 "(0 means all)") \ 2760 \ 2761 develop(intx, GuaranteedSafepointInterval, 1000, \ 2762 "Guarantee a safepoint (at least) every so many milliseconds " \ 2763 "(0 means none)") \ 2764 \ 2765 product(intx, SafepointTimeoutDelay, 10000, \ 2766 "Delay in milliseconds for option SafepointTimeout") \ 2767 \ 2768 product(intx, NmethodSweepFraction, 4, \ 2769 "Number of invocations of sweeper to cover all nmethods") \ 2770 \ 2771 product(intx, NmethodSweepCheckInterval, 5, \ 2772 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2773 \ 2774 notproduct(intx, MemProfilingInterval, 500, \ 2775 "Time between each invocation of the MemProfiler") \ 2776 \ 2777 develop(intx, MallocCatchPtr, -1, \ 2778 "Hit breakpoint when mallocing/freeing this pointer") \ 2779 \ 2780 notproduct(intx, AssertRepeat, 1, \ 2781 "number of times to evaluate expression in assert " \ 2782 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2783 \ 2784 notproduct(ccstrlist, SuppressErrorAt, "", \ 2785 "List of assertions (file:line) to muzzle") \ 2786 \ 2787 notproduct(uintx, HandleAllocationLimit, 1024, \ 2788 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2789 "is used") \ 2790 \ 2791 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2792 "Threshold for total handle allocation when " \ 2793 "+TraceHandleAllocation is used") \ 2794 \ 2795 develop(intx, StackPrintLimit, 100, \ 2796 "number of stack frames to print in VM-level stack dump") \ 2797 \ 2798 notproduct(intx, MaxElementPrintSize, 256, \ 2799 "maximum number of elements to print") \ 2800 \ 2801 notproduct(intx, MaxSubklassPrintSize, 4, \ 2802 "maximum number of subklasses to print when printing klass") \ 2803 \ 2804 product(intx, MaxInlineLevel, 9, \ 2805 "maximum number of nested calls that are inlined") \ 2806 \ 2807 product(intx, MaxRecursiveInlineLevel, 1, \ 2808 "maximum number of nested recursive calls that are inlined") \ 2809 \ 2810 product_pd(intx, InlineSmallCode, \ 2811 "Only inline already compiled methods if their code size is " \ 2812 "less than this") \ 2813 \ 2814 product(intx, MaxInlineSize, 35, \ 2815 "maximum bytecode size of a method to be inlined") \ 2816 \ 2817 product_pd(intx, FreqInlineSize, \ 2818 "maximum bytecode size of a frequent method to be inlined") \ 2819 \ 2820 product(intx, MaxTrivialSize, 6, \ 2821 "maximum bytecode size of a trivial method to be inlined") \ 2822 \ 2823 product(intx, MinInliningThreshold, 250, \ 2824 "min. invocation count a method needs to have to be inlined") \ 2825 \ 2826 develop(intx, AlignEntryCode, 4, \ 2827 "aligns entry code to specified value (in bytes)") \ 2828 \ 2829 develop(intx, MethodHistogramCutoff, 100, \ 2830 "cutoff value for method invoc. histogram (+CountCalls)") \ 2831 \ 2832 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2833 "# of interpreted methods to show in profile") \ 2834 \ 2835 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2836 "# of compiled methods to show in profile") \ 2837 \ 2838 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2839 "# of stub methods to show in profile") \ 2840 \ 2841 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2842 "# of runtime stub nodes to show in profile") \ 2843 \ 2844 product(intx, ProfileIntervalsTicks, 100, \ 2845 "# of ticks between printing of interval profile " \ 2846 "(+ProfileIntervals)") \ 2847 \ 2848 notproduct(intx, ScavengeALotInterval, 1, \ 2849 "Interval between which scavenge will occur with +ScavengeALot") \ 2850 \ 2851 notproduct(intx, FullGCALotInterval, 1, \ 2852 "Interval between which full gc will occur with +FullGCALot") \ 2853 \ 2854 notproduct(intx, FullGCALotStart, 0, \ 2855 "For which invocation to start FullGCAlot") \ 2856 \ 2857 notproduct(intx, FullGCALotDummies, 32*K, \ 2858 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2859 "to move") \ 2860 \ 2861 develop(intx, DontYieldALotInterval, 10, \ 2862 "Interval between which yields will be dropped (milliseconds)") \ 2863 \ 2864 develop(intx, MinSleepInterval, 1, \ 2865 "Minimum sleep() interval (milliseconds) when " \ 2866 "ConvertSleepToYield is off (used for SOLARIS)") \ 2867 \ 2868 product(intx, EventLogLength, 2000, \ 2869 "maximum nof events in event log") \ 2870 \ 2871 develop(intx, ProfilerPCTickThreshold, 15, \ 2872 "Number of ticks in a PC buckets to be a hotspot") \ 2873 \ 2874 notproduct(intx, DeoptimizeALotInterval, 5, \ 2875 "Number of exits until DeoptimizeALot kicks in") \ 2876 \ 2877 notproduct(intx, ZombieALotInterval, 5, \ 2878 "Number of exits until ZombieALot kicks in") \ 2879 \ 2880 develop(bool, StressNonEntrant, false, \ 2881 "Mark nmethods non-entrant at registration") \ 2882 \ 2883 diagnostic(intx, MallocVerifyInterval, 0, \ 2884 "if non-zero, verify C heap after every N calls to " \ 2885 "malloc/realloc/free") \ 2886 \ 2887 diagnostic(intx, MallocVerifyStart, 0, \ 2888 "if non-zero, start verifying C heap after Nth call to " \ 2889 "malloc/realloc/free") \ 2890 \ 2891 product(intx, TypeProfileWidth, 2, \ 2892 "number of receiver types to record in call/cast profile") \ 2893 \ 2894 develop(intx, BciProfileWidth, 2, \ 2895 "number of return bci's to record in ret profile") \ 2896 \ 2897 product(intx, PerMethodRecompilationCutoff, 400, \ 2898 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2899 \ 2900 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2901 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2902 \ 2903 product(intx, PerMethodTrapLimit, 100, \ 2904 "Limit on traps (of one kind) in a method (includes inlines)") \ 2905 \ 2906 product(intx, PerBytecodeTrapLimit, 4, \ 2907 "Limit on traps (of one kind) at a particular BCI") \ 2908 \ 2909 develop(intx, FreqCountInvocations, 1, \ 2910 "Scaling factor for branch frequencies (deprecated)") \ 2911 \ 2912 develop(intx, InlineFrequencyRatio, 20, \ 2913 "Ratio of call site execution to caller method invocation") \ 2914 \ 2915 develop_pd(intx, InlineFrequencyCount, \ 2916 "Count of call site execution necessary to trigger frequent " \ 2917 "inlining") \ 2918 \ 2919 develop(intx, InlineThrowCount, 50, \ 2920 "Force inlining of interpreted methods that throw this often") \ 2921 \ 2922 develop(intx, InlineThrowMaxSize, 200, \ 2923 "Force inlining of throwing methods smaller than this") \ 2924 \ 2925 product(intx, AliasLevel, 3, \ 2926 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2927 "2 for class split, 3 for unique instances") \ 2928 \ 2929 develop(bool, VerifyAliases, false, \ 2930 "perform extra checks on the results of alias analysis") \ 2931 \ 2932 develop(intx, ProfilerNodeSize, 1024, \ 2933 "Size in K to allocate for the Profile Nodes of each thread") \ 2934 \ 2935 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2936 "Number of times to spin wait on a v8 atomic operation lock") \ 2937 \ 2938 product(intx, ReadSpinIterations, 100, \ 2939 "Number of read attempts before a yield (spin inner loop)") \ 2940 \ 2941 product_pd(intx, PreInflateSpin, \ 2942 "Number of times to spin wait before inflation") \ 2943 \ 2944 product(intx, PreBlockSpin, 10, \ 2945 "Number of times to spin in an inflated lock before going to " \ 2946 "an OS lock") \ 2947 \ 2948 /* gc parameters */ \ 2949 product(uintx, InitialHeapSize, 0, \ 2950 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2951 \ 2952 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2953 "Maximum heap size (in bytes)") \ 2954 \ 2955 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2956 "Initial tenured generation size (in bytes)") \ 2957 \ 2958 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2959 "Initial new generation size (in bytes)") \ 2960 \ 2961 product(uintx, MaxNewSize, max_uintx, \ 2962 "Maximum new generation size (in bytes), max_uintx means set " \ 2963 "ergonomically") \ 2964 \ 2965 product(uintx, PretenureSizeThreshold, 0, \ 2966 "Maximum size in bytes of objects allocated in DefNew " \ 2967 "generation; zero means no maximum") \ 2968 \ 2969 product(uintx, TLABSize, 0, \ 2970 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2971 \ 2972 product(uintx, MinTLABSize, 2*K, \ 2973 "Minimum allowed TLAB size (in bytes)") \ 2974 \ 2975 product(uintx, TLABAllocationWeight, 35, \ 2976 "Allocation averaging weight") \ 2977 \ 2978 product(uintx, TLABWasteTargetPercent, 1, \ 2979 "Percentage of Eden that can be wasted") \ 2980 \ 2981 product(uintx, TLABRefillWasteFraction, 64, \ 2982 "Max TLAB waste at a refill (internal fragmentation)") \ 2983 \ 2984 product(uintx, TLABWasteIncrement, 4, \ 2985 "Increment allowed waste at slow allocation") \ 2986 \ 2987 product(intx, SurvivorRatio, 8, \ 2988 "Ratio of eden/survivor space size") \ 2989 \ 2990 product(intx, NewRatio, 2, \ 2991 "Ratio of new/old generation sizes") \ 2992 \ 2993 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2994 "Max percent of eden objects that will be live at scavenge") \ 2995 \ 2996 product_pd(uintx, NewSizeThreadIncrease, \ 2997 "Additional size added to desired new generation size per " \ 2998 "non-daemon thread (in bytes)") \ 2999 \ 3000 product_pd(uintx, PermSize, \ 3001 "Initial size of permanent generation (in bytes)") \ 3002 \ 3003 product_pd(uintx, MaxPermSize, \ 3004 "Maximum size of permanent generation (in bytes)") \ 3005 \ 3006 product(uintx, MinHeapFreeRatio, 40, \ 3007 "Min percentage of heap free after GC to avoid expansion") \ 3008 \ 3009 product(uintx, MaxHeapFreeRatio, 70, \ 3010 "Max percentage of heap free after GC to avoid shrinking") \ 3011 \ 3012 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3013 "Number of milliseconds per MB of free space in the heap") \ 3014 \ 3015 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3016 "Min change in heap space due to GC (in bytes)") \ 3017 \ 3018 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3019 "Min expansion of permanent heap (in bytes)") \ 3020 \ 3021 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3022 "Max expansion of permanent heap without full GC (in bytes)") \ 3023 \ 3024 product(intx, QueuedAllocationWarningCount, 0, \ 3025 "Number of times an allocation that queues behind a GC " \ 3026 "will retry before printing a warning") \ 3027 \ 3028 diagnostic(uintx, VerifyGCStartAt, 0, \ 3029 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3030 \ 3031 diagnostic(intx, VerifyGCLevel, 0, \ 3032 "Generation level at which to start +VerifyBefore/AfterGC") \ 3033 \ 3034 develop(uintx, ExitAfterGCNum, 0, \ 3035 "If non-zero, exit after this GC.") \ 3036 \ 3037 product(intx, MaxTenuringThreshold, 15, \ 3038 "Maximum value for tenuring threshold") \ 3039 \ 3040 product(intx, InitialTenuringThreshold, 7, \ 3041 "Initial value for tenuring threshold") \ 3042 \ 3043 product(intx, TargetSurvivorRatio, 50, \ 3044 "Desired percentage of survivor space used after scavenge") \ 3045 \ 3046 product(uintx, MarkSweepDeadRatio, 5, \ 3047 "Percentage (0-100) of the old gen allowed as dead wood." \ 3048 "Serial mark sweep treats this as both the min and max value." \ 3049 "CMS uses this value only if it falls back to mark sweep." \ 3050 "Par compact uses a variable scale based on the density of the" \ 3051 "generation and treats this as the max value when the heap is" \ 3052 "either completely full or completely empty. Par compact also" \ 3053 "has a smaller default value; see arguments.cpp.") \ 3054 \ 3055 product(uintx, PermMarkSweepDeadRatio, 20, \ 3056 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3057 "See MarkSweepDeadRatio for collector-specific comments.") \ 3058 \ 3059 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3060 "How often should we fully compact the heap (ignoring the dead " \ 3061 "space parameters)") \ 3062 \ 3063 product(intx, PrintCMSStatistics, 0, \ 3064 "Statistics for CMS") \ 3065 \ 3066 product(bool, PrintCMSInitiationStatistics, false, \ 3067 "Statistics for initiating a CMS collection") \ 3068 \ 3069 product(intx, PrintFLSStatistics, 0, \ 3070 "Statistics for CMS' FreeListSpace") \ 3071 \ 3072 product(intx, PrintFLSCensus, 0, \ 3073 "Census for CMS' FreeListSpace") \ 3074 \ 3075 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3076 "Delay in ms between expansion and allocation") \ 3077 \ 3078 product(intx, DeferThrSuspendLoopCount, 4000, \ 3079 "(Unstable) Number of times to iterate in safepoint loop " \ 3080 " before blocking VM threads ") \ 3081 \ 3082 product(intx, DeferPollingPageLoopCount, -1, \ 3083 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3084 "before changing safepoint polling page to RO ") \ 3085 \ 3086 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3087 \ 3088 product(bool, PSChunkLargeArrays, true, \ 3089 "true: process large arrays in chunks") \ 3090 \ 3091 product(uintx, GCDrainStackTargetSize, 64, \ 3092 "how many entries we'll try to leave on the stack during " \ 3093 "parallel GC") \ 3094 \ 3095 /* stack parameters */ \ 3096 product_pd(intx, StackYellowPages, \ 3097 "Number of yellow zone (recoverable overflows) pages") \ 3098 \ 3099 product_pd(intx, StackRedPages, \ 3100 "Number of red zone (unrecoverable overflows) pages") \ 3101 \ 3102 product_pd(intx, StackShadowPages, \ 3103 "Number of shadow zone (for overflow checking) pages" \ 3104 " this should exceed the depth of the VM and native call stack") \ 3105 \ 3106 product_pd(intx, ThreadStackSize, \ 3107 "Thread Stack Size (in Kbytes)") \ 3108 \ 3109 product_pd(intx, VMThreadStackSize, \ 3110 "Non-Java Thread Stack Size (in Kbytes)") \ 3111 \ 3112 product_pd(intx, CompilerThreadStackSize, \ 3113 "Compiler Thread Stack Size (in Kbytes)") \ 3114 \ 3115 develop_pd(uintx, JVMInvokeMethodSlack, \ 3116 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3117 \ 3118 product(uintx, ThreadSafetyMargin, 50*M, \ 3119 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3120 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3121 "disable this feature") \ 3122 \ 3123 /* code cache parameters */ \ 3124 develop(uintx, CodeCacheSegmentSize, 64, \ 3125 "Code cache segment size (in bytes) - smallest unit of " \ 3126 "allocation") \ 3127 \ 3128 develop_pd(intx, CodeEntryAlignment, \ 3129 "Code entry alignment for generated code (in bytes)") \ 3130 \ 3131 product_pd(intx, OptoLoopAlignment, \ 3132 "Align inner loops to zero relative to this modulus") \ 3133 \ 3134 product_pd(uintx, InitialCodeCacheSize, \ 3135 "Initial code cache size (in bytes)") \ 3136 \ 3137 product_pd(uintx, ReservedCodeCacheSize, \ 3138 "Reserved code cache size (in bytes) - maximum code cache size") \ 3139 \ 3140 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3141 "When less than X space left, we stop compiling.") \ 3142 \ 3143 product_pd(uintx, CodeCacheExpansionSize, \ 3144 "Code cache expansion size (in bytes)") \ 3145 \ 3146 develop_pd(uintx, CodeCacheMinBlockLength, \ 3147 "Minimum number of segments in a code cache block.") \ 3148 \ 3149 notproduct(bool, ExitOnFullCodeCache, false, \ 3150 "Exit the VM if we fill the code cache.") \ 3151 \ 3152 product(bool, UseCodeCacheFlushing, false, \ 3153 "Attempt to clean the code cache before shutting off compiler") \ 3154 \ 3155 product(intx, MinCodeCacheFlushingInterval, 30, \ 3156 "Min number of seconds between code cache cleaning sessions") \ 3157 \ 3158 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3159 "When less than X space left, start code cache cleaning") \ 3160 \ 3161 /* interpreter debugging */ \ 3162 develop(intx, BinarySwitchThreshold, 5, \ 3163 "Minimal number of lookupswitch entries for rewriting to binary " \ 3164 "switch") \ 3165 \ 3166 develop(intx, StopInterpreterAt, 0, \ 3167 "Stops interpreter execution at specified bytecode number") \ 3168 \ 3169 develop(intx, TraceBytecodesAt, 0, \ 3170 "Traces bytecodes starting with specified bytecode number") \ 3171 \ 3172 /* compiler interface */ \ 3173 develop(intx, CIStart, 0, \ 3174 "the id of the first compilation to permit") \ 3175 \ 3176 develop(intx, CIStop, -1, \ 3177 "the id of the last compilation to permit") \ 3178 \ 3179 develop(intx, CIStartOSR, 0, \ 3180 "the id of the first osr compilation to permit " \ 3181 "(CICountOSR must be on)") \ 3182 \ 3183 develop(intx, CIStopOSR, -1, \ 3184 "the id of the last osr compilation to permit " \ 3185 "(CICountOSR must be on)") \ 3186 \ 3187 develop(intx, CIBreakAtOSR, -1, \ 3188 "id of osr compilation to break at") \ 3189 \ 3190 develop(intx, CIBreakAt, -1, \ 3191 "id of compilation to break at") \ 3192 \ 3193 product(ccstrlist, CompileOnly, "", \ 3194 "List of methods (pkg/class.name) to restrict compilation to") \ 3195 \ 3196 product(ccstr, CompileCommandFile, NULL, \ 3197 "Read compiler commands from this file [.hotspot_compiler]") \ 3198 \ 3199 product(ccstrlist, CompileCommand, "", \ 3200 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3201 \ 3202 product(bool, CICompilerCountPerCPU, false, \ 3203 "1 compiler thread for log(N CPUs)") \ 3204 \ 3205 develop(intx, CIFireOOMAt, -1, \ 3206 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3207 "(non-negative value throws OOM after this many CI accesses " \ 3208 "in each compile)") \ 3209 \ 3210 develop(intx, CIFireOOMAtDelay, -1, \ 3211 "Wait for this many CI accesses to occur in all compiles before " \ 3212 "beginning to throw OutOfMemoryErrors in each compile") \ 3213 \ 3214 notproduct(bool, CIObjectFactoryVerify, false, \ 3215 "enable potentially expensive verification in ciObjectFactory") \ 3216 \ 3217 /* Priorities */ \ 3218 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3219 \ 3220 product(intx, ThreadPriorityPolicy, 0, \ 3221 "0 : Normal. "\ 3222 " VM chooses priorities that are appropriate for normal "\ 3223 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3224 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3225 " map to lower native priority values. On Windows applications"\ 3226 " are allowed to use higher native priorities. However, with "\ 3227 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3228 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3229 " interfere with system threads. On Linux thread priorities "\ 3230 " are ignored because the OS does not support static priority "\ 3231 " in SCHED_OTHER scheduling class which is the only choice for"\ 3232 " non-root, non-realtime applications. "\ 3233 "1 : Aggressive. "\ 3234 " Java thread priorities map over to the entire range of "\ 3235 " native thread priorities. Higher Java thread priorities map "\ 3236 " to higher native thread priorities. This policy should be "\ 3237 " used with care, as sometimes it can cause performance "\ 3238 " degradation in the application and/or the entire system. On "\ 3239 " Linux this policy requires root privilege.") \ 3240 \ 3241 product(bool, ThreadPriorityVerbose, false, \ 3242 "print priority changes") \ 3243 \ 3244 product(intx, DefaultThreadPriority, -1, \ 3245 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3246 \ 3247 product(intx, CompilerThreadPriority, -1, \ 3248 "what priority should compiler threads run at (-1 means no change)") \ 3249 \ 3250 product(intx, VMThreadPriority, -1, \ 3251 "what priority should VM threads run at (-1 means no change)") \ 3252 \ 3253 product(bool, CompilerThreadHintNoPreempt, true, \ 3254 "(Solaris only) Give compiler threads an extra quanta") \ 3255 \ 3256 product(bool, VMThreadHintNoPreempt, false, \ 3257 "(Solaris only) Give VM thread an extra quanta") \ 3258 \ 3259 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3260 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3261 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3262 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3263 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3264 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3265 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3266 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3267 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3268 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3269 \ 3270 /* compiler debugging */ \ 3271 notproduct(intx, CompileTheWorldStartAt, 1, \ 3272 "First class to consider when using +CompileTheWorld") \ 3273 \ 3274 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3275 "Last class to consider when using +CompileTheWorld") \ 3276 \ 3277 develop(intx, NewCodeParameter, 0, \ 3278 "Testing Only: Create a dedicated integer parameter before " \ 3279 "putback") \ 3280 \ 3281 /* new oopmap storage allocation */ \ 3282 develop(intx, MinOopMapAllocation, 8, \ 3283 "Minimum number of OopMap entries in an OopMapSet") \ 3284 \ 3285 /* Background Compilation */ \ 3286 develop(intx, LongCompileThreshold, 50, \ 3287 "Used with +TraceLongCompiles") \ 3288 \ 3289 product(intx, StarvationMonitorInterval, 200, \ 3290 "Pause between each check in ms") \ 3291 \ 3292 /* recompilation */ \ 3293 product_pd(intx, CompileThreshold, \ 3294 "number of interpreted method invocations before (re-)compiling") \ 3295 \ 3296 product_pd(intx, BackEdgeThreshold, \ 3297 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3298 \ 3299 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3300 "Interpreter (tier 0) invocation notification frequency.") \ 3301 \ 3302 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3303 "C1 without MDO (tier 2) invocation notification frequency.") \ 3304 \ 3305 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3306 "C1 with MDO profiling (tier 3) invocation notification " \ 3307 "frequency.") \ 3308 \ 3309 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3310 "Interpreter (tier 0) invocation notification frequency.") \ 3311 \ 3312 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3313 "C1 without MDO (tier 2) invocation notification frequency.") \ 3314 \ 3315 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3316 "C1 with MDO profiling (tier 3) invocation notification " \ 3317 "frequency.") \ 3318 \ 3319 product(intx, Tier2CompileThreshold, 0, \ 3320 "threshold at which tier 2 compilation is invoked") \ 3321 \ 3322 product(intx, Tier2BackEdgeThreshold, 0, \ 3323 "Back edge threshold at which tier 2 compilation is invoked") \ 3324 \ 3325 product(intx, Tier3InvocationThreshold, 200, \ 3326 "Compile if number of method invocations crosses this " \ 3327 "threshold") \ 3328 \ 3329 product(intx, Tier3MinInvocationThreshold, 100, \ 3330 "Minimum invocation to compile at tier 3") \ 3331 \ 3332 product(intx, Tier3CompileThreshold, 2000, \ 3333 "Threshold at which tier 3 compilation is invoked (invocation " \ 3334 "minimum must be satisfied.") \ 3335 \ 3336 product(intx, Tier3BackEdgeThreshold, 7000, \ 3337 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3338 \ 3339 product(intx, Tier4InvocationThreshold, 5000, \ 3340 "Compile if number of method invocations crosses this " \ 3341 "threshold") \ 3342 \ 3343 product(intx, Tier4MinInvocationThreshold, 600, \ 3344 "Minimum invocation to compile at tier 4") \ 3345 \ 3346 product(intx, Tier4CompileThreshold, 15000, \ 3347 "Threshold at which tier 4 compilation is invoked (invocation " \ 3348 "minimum must be satisfied.") \ 3349 \ 3350 product(intx, Tier4BackEdgeThreshold, 40000, \ 3351 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3352 \ 3353 product(intx, Tier3DelayOn, 5, \ 3354 "If C2 queue size grows over this amount per compiler thread " \ 3355 "stop compiling at tier 3 and start compiling at tier 2") \ 3356 \ 3357 product(intx, Tier3DelayOff, 2, \ 3358 "If C2 queue size is less than this amount per compiler thread " \ 3359 "allow methods compiled at tier 2 transition to tier 3") \ 3360 \ 3361 product(intx, Tier3LoadFeedback, 5, \ 3362 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3363 "reaches this amount per compiler thread") \ 3364 \ 3365 product(intx, Tier4LoadFeedback, 3, \ 3366 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3367 "reaches this amount per compiler thread") \ 3368 \ 3369 product(intx, TieredCompileTaskTimeout, 50, \ 3370 "Kill compile task if method was not used within " \ 3371 "given timeout in milliseconds") \ 3372 \ 3373 product(intx, TieredStopAtLevel, 4, \ 3374 "Stop at given compilation level") \ 3375 \ 3376 product(intx, Tier0ProfilingStartPercentage, 200, \ 3377 "Start profiling in interpreter if the counters exceed tier 3" \ 3378 "thresholds by the specified percentage") \ 3379 \ 3380 product(intx, TieredRateUpdateMinTime, 1, \ 3381 "Minimum rate sampling interval (in milliseconds)") \ 3382 \ 3383 product(intx, TieredRateUpdateMaxTime, 25, \ 3384 "Maximum rate sampling interval (in milliseconds)") \ 3385 \ 3386 product_pd(bool, TieredCompilation, \ 3387 "Enable tiered compilation") \ 3388 \ 3389 product(bool, PrintTieredEvents, false, \ 3390 "Print tiered events notifications") \ 3391 \ 3392 product(bool, StressTieredRuntime, false, \ 3393 "Alternate client and server compiler on compile requests") \ 3394 \ 3395 product_pd(intx, OnStackReplacePercentage, \ 3396 "NON_TIERED number of method invocations/branches (expressed as %"\ 3397 "of CompileThreshold) before (re-)compiling OSR code") \ 3398 \ 3399 product(intx, InterpreterProfilePercentage, 33, \ 3400 "NON_TIERED number of method invocations/branches (expressed as %"\ 3401 "of CompileThreshold) before profiling in the interpreter") \ 3402 \ 3403 develop(intx, MaxRecompilationSearchLength, 10, \ 3404 "max. # frames to inspect searching for recompilee") \ 3405 \ 3406 develop(intx, MaxInterpretedSearchLength, 3, \ 3407 "max. # interp. frames to skip when searching for recompilee") \ 3408 \ 3409 develop(intx, DesiredMethodLimit, 8000, \ 3410 "desired max. method size (in bytecodes) after inlining") \ 3411 \ 3412 develop(intx, HugeMethodLimit, 8000, \ 3413 "don't compile methods larger than this if " \ 3414 "+DontCompileHugeMethods") \ 3415 \ 3416 /* New JDK 1.4 reflection implementation */ \ 3417 \ 3418 develop(bool, UseNewReflection, true, \ 3419 "Temporary flag for transition to reflection based on dynamic " \ 3420 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3421 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3422 "changes were needed") \ 3423 \ 3424 develop(bool, VerifyReflectionBytecodes, false, \ 3425 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3426 "in situations like that described in 4486457 or for " \ 3427 "constructors generated for serialization, so can not be enabled "\ 3428 "in product.") \ 3429 \ 3430 product(bool, ReflectionWrapResolutionErrors, true, \ 3431 "Temporary flag for transition to AbstractMethodError wrapped " \ 3432 "in InvocationTargetException. See 6531596") \ 3433 \ 3434 \ 3435 develop(intx, FastSuperclassLimit, 8, \ 3436 "Depth of hardwired instanceof accelerator array") \ 3437 \ 3438 /* Properties for Java libraries */ \ 3439 \ 3440 product(intx, MaxDirectMemorySize, -1, \ 3441 "Maximum total size of NIO direct-buffer allocations") \ 3442 \ 3443 /* temporary developer defined flags */ \ 3444 \ 3445 diagnostic(bool, UseNewCode, false, \ 3446 "Testing Only: Use the new version while testing") \ 3447 \ 3448 diagnostic(bool, UseNewCode2, false, \ 3449 "Testing Only: Use the new version while testing") \ 3450 \ 3451 diagnostic(bool, UseNewCode3, false, \ 3452 "Testing Only: Use the new version while testing") \ 3453 \ 3454 /* flags for performance data collection */ \ 3455 \ 3456 product(bool, UsePerfData, true, \ 3457 "Flag to disable jvmstat instrumentation for performance testing" \ 3458 "and problem isolation purposes.") \ 3459 \ 3460 product(bool, PerfDataSaveToFile, false, \ 3461 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3462 \ 3463 product(ccstr, PerfDataSaveFile, NULL, \ 3464 "Save PerfData memory to the specified absolute pathname," \ 3465 "%p in the file name if present will be replaced by pid") \ 3466 \ 3467 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3468 "Data sampling interval in milliseconds") \ 3469 \ 3470 develop(bool, PerfTraceDataCreation, false, \ 3471 "Trace creation of Performance Data Entries") \ 3472 \ 3473 develop(bool, PerfTraceMemOps, false, \ 3474 "Trace PerfMemory create/attach/detach calls") \ 3475 \ 3476 product(bool, PerfDisableSharedMem, false, \ 3477 "Store performance data in standard memory") \ 3478 \ 3479 product(intx, PerfDataMemorySize, 32*K, \ 3480 "Size of performance data memory region. Will be rounded " \ 3481 "up to a multiple of the native os page size.") \ 3482 \ 3483 product(intx, PerfMaxStringConstLength, 1024, \ 3484 "Maximum PerfStringConstant string length before truncation") \ 3485 \ 3486 product(bool, PerfAllowAtExitRegistration, false, \ 3487 "Allow registration of atexit() methods") \ 3488 \ 3489 product(bool, PerfBypassFileSystemCheck, false, \ 3490 "Bypass Win32 file system criteria checks (Windows Only)") \ 3491 \ 3492 product(intx, UnguardOnExecutionViolation, 0, \ 3493 "Unguard page and retry on no-execute fault (Win32 only)" \ 3494 "0=off, 1=conservative, 2=aggressive") \ 3495 \ 3496 /* Serviceability Support */ \ 3497 \ 3498 product(bool, ManagementServer, false, \ 3499 "Create JMX Management Server") \ 3500 \ 3501 product(bool, DisableAttachMechanism, false, \ 3502 "Disable mechanism that allows tools to attach to this VM") \ 3503 \ 3504 product(bool, StartAttachListener, false, \ 3505 "Always start Attach Listener at VM startup") \ 3506 \ 3507 manageable(bool, PrintConcurrentLocks, false, \ 3508 "Print java.util.concurrent locks in thread dump") \ 3509 \ 3510 /* Shared spaces */ \ 3511 \ 3512 product(bool, UseSharedSpaces, true, \ 3513 "Use shared spaces in the permanent generation") \ 3514 \ 3515 product(bool, RequireSharedSpaces, false, \ 3516 "Require shared spaces in the permanent generation") \ 3517 \ 3518 product(bool, ForceSharedSpaces, false, \ 3519 "Require shared spaces in the permanent generation") \ 3520 \ 3521 product(bool, DumpSharedSpaces, false, \ 3522 "Special mode: JVM reads a class list, loads classes, builds " \ 3523 "shared spaces, and dumps the shared spaces to a file to be " \ 3524 "used in future JVM runs.") \ 3525 \ 3526 product(bool, PrintSharedSpaces, false, \ 3527 "Print usage of shared spaces") \ 3528 \ 3529 product(uintx, SharedDummyBlockSize, 512*M, \ 3530 "Size of dummy block used to shift heap addresses (in bytes)") \ 3531 \ 3532 product(uintx, SharedReadWriteSize, 12*M, \ 3533 "Size of read-write space in permanent generation (in bytes)") \ 3534 \ 3535 product(uintx, SharedReadOnlySize, 10*M, \ 3536 "Size of read-only space in permanent generation (in bytes)") \ 3537 \ 3538 product(uintx, SharedMiscDataSize, 4*M, \ 3539 "Size of the shared data area adjacent to the heap (in bytes)") \ 3540 \ 3541 product(uintx, SharedMiscCodeSize, 4*M, \ 3542 "Size of the shared code area adjacent to the heap (in bytes)") \ 3543 \ 3544 diagnostic(bool, SharedOptimizeColdStart, true, \ 3545 "At dump time, order shared objects to achieve better " \ 3546 "cold startup time.") \ 3547 \ 3548 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3549 "Reordering policy for SharedOptimizeColdStart " \ 3550 "0=favor classload-time locality, 1=balanced, " \ 3551 "2=favor runtime locality") \ 3552 \ 3553 diagnostic(bool, SharedSkipVerify, false, \ 3554 "Skip assert() and verify() which page-in unwanted shared " \ 3555 "objects. ") \ 3556 \ 3557 product(bool, AnonymousClasses, false, \ 3558 "support sun.misc.Unsafe.defineAnonymousClass") \ 3559 \ 3560 experimental(bool, EnableMethodHandles, false, \ 3561 "support method handles (true by default under JSR 292)") \ 3562 \ 3563 diagnostic(intx, MethodHandlePushLimit, 3, \ 3564 "number of additional stack slots a method handle may push") \ 3565 \ 3566 develop(bool, TraceMethodHandles, false, \ 3567 "trace internal method handle operations") \ 3568 \ 3569 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3570 "perform extra checks when constructing method handles") \ 3571 \ 3572 diagnostic(bool, OptimizeMethodHandles, true, \ 3573 "when constructing method handles, try to improve them") \ 3574 \ 3575 experimental(bool, TrustFinalNonStaticFields, false, \ 3576 "trust final non-static declarations for constant folding") \ 3577 \ 3578 experimental(bool, EnableInvokeDynamic, false, \ 3579 "recognize the invokedynamic instruction") \ 3580 \ 3581 experimental(bool, AllowTransitionalJSR292, true, \ 3582 "recognize pre-PFD formats of invokedynamic") \ 3583 \ 3584 develop(bool, TraceInvokeDynamic, false, \ 3585 "trace internal invoke dynamic operations") \ 3586 \ 3587 diagnostic(bool, PauseAtStartup, false, \ 3588 "Causes the VM to pause at startup time and wait for the pause " \ 3589 "file to be removed (default: ./vm.paused.<pid>)") \ 3590 \ 3591 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3592 "The file to create and for whose removal to await when pausing " \ 3593 "at startup. (default: ./vm.paused.<pid>)") \ 3594 \ 3595 product(bool, ExtendedDTraceProbes, false, \ 3596 "Enable performance-impacting dtrace probes") \ 3597 \ 3598 product(bool, DTraceMethodProbes, false, \ 3599 "Enable dtrace probes for method-entry and method-exit") \ 3600 \ 3601 product(bool, DTraceAllocProbes, false, \ 3602 "Enable dtrace probes for object allocation") \ 3603 \ 3604 product(bool, DTraceMonitorProbes, false, \ 3605 "Enable dtrace probes for monitor events") \ 3606 \ 3607 product(bool, RelaxAccessControlCheck, false, \ 3608 "Relax the access control checks in the verifier") \ 3609 \ 3610 diagnostic(bool, PrintDTraceDOF, false, \ 3611 "Print the DTrace DOF passed to the system for JSDT probes") \ 3612 \ 3613 product(bool, UseVMInterruptibleIO, false, \ 3614 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3615 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3616 " of this flag is true for JDK 6 and earliers") 3617 3618/* 3619 * Macros for factoring of globals 3620 */ 3621 3622// Interface macros 3623#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3624#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3625#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3626#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3627#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3628#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3629#ifdef PRODUCT 3630#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3631#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3632#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3633#else 3634#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3635#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3636#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3637#endif 3638// Special LP64 flags, product only needed for now. 3639#ifdef _LP64 3640#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3641#else 3642#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3643#endif // _LP64 3644 3645// Implementation macros 3646#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3647#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3648#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3649#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3650#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3651#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3652#ifdef PRODUCT 3653#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3654#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3655#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3656#else 3657#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3658#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3659#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3660#endif 3661#ifdef _LP64 3662#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3663#else 3664#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3665#endif // _LP64 3666 3667RUNTIME_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) 3668 3669RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3670