globals.hpp revision 1438:3bfae429e2cf
1/* 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#if !defined(COMPILER1) && !defined(COMPILER2) 26define_pd_global(bool, BackgroundCompilation, false); 27define_pd_global(bool, UseTLAB, false); 28define_pd_global(bool, CICompileOSR, false); 29define_pd_global(bool, UseTypeProfile, false); 30define_pd_global(bool, UseOnStackReplacement, false); 31define_pd_global(bool, InlineIntrinsics, false); 32define_pd_global(bool, PreferInterpreterNativeStubs, true); 33define_pd_global(bool, ProfileInterpreter, false); 34define_pd_global(bool, ProfileTraps, false); 35define_pd_global(bool, TieredCompilation, false); 36 37define_pd_global(intx, CompileThreshold, 0); 38define_pd_global(intx, Tier2CompileThreshold, 0); 39define_pd_global(intx, Tier3CompileThreshold, 0); 40define_pd_global(intx, Tier4CompileThreshold, 0); 41 42define_pd_global(intx, BackEdgeThreshold, 0); 43define_pd_global(intx, Tier2BackEdgeThreshold, 0); 44define_pd_global(intx, Tier3BackEdgeThreshold, 0); 45define_pd_global(intx, Tier4BackEdgeThreshold, 0); 46 47define_pd_global(intx, OnStackReplacePercentage, 0); 48define_pd_global(bool, ResizeTLAB, false); 49define_pd_global(intx, FreqInlineSize, 0); 50define_pd_global(intx, InlineSmallCode, 0); 51define_pd_global(intx, NewSizeThreadIncrease, 4*K); 52define_pd_global(intx, InlineClassNatives, true); 53define_pd_global(intx, InlineUnsafeOps, true); 54define_pd_global(intx, InitialCodeCacheSize, 160*K); 55define_pd_global(intx, ReservedCodeCacheSize, 32*M); 56define_pd_global(intx, CodeCacheExpansionSize, 32*K); 57define_pd_global(intx, CodeCacheMinBlockLength, 1); 58define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 59define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 60define_pd_global(bool, NeverActAsServerClassMachine, true); 61define_pd_global(uint64_t,MaxRAM, 1ULL*G); 62#define CI_COMPILER_COUNT 0 63#else 64 65#ifdef COMPILER2 66#define CI_COMPILER_COUNT 2 67#else 68#define CI_COMPILER_COUNT 1 69#endif // COMPILER2 70 71#endif // no compilers 72 73 74// string type aliases used only in this file 75typedef const char* ccstr; 76typedef const char* ccstrlist; // represents string arguments which accumulate 77 78enum FlagValueOrigin { 79 DEFAULT = 0, 80 COMMAND_LINE = 1, 81 ENVIRON_VAR = 2, 82 CONFIG_FILE = 3, 83 MANAGEMENT = 4, 84 ERGONOMIC = 5, 85 ATTACH_ON_DEMAND = 6, 86 INTERNAL = 99 87}; 88 89struct Flag { 90 const char *type; 91 const char *name; 92 void* addr; 93 const char *kind; 94 FlagValueOrigin origin; 95 96 // points to all Flags static array 97 static Flag *flags; 98 99 // number of flags 100 static size_t numFlags; 101 102 static Flag* find_flag(char* name, size_t length); 103 104 bool is_bool() const { return strcmp(type, "bool") == 0; } 105 bool get_bool() const { return *((bool*) addr); } 106 void set_bool(bool value) { *((bool*) addr) = value; } 107 108 bool is_intx() const { return strcmp(type, "intx") == 0; } 109 intx get_intx() const { return *((intx*) addr); } 110 void set_intx(intx value) { *((intx*) addr) = value; } 111 112 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 113 uintx get_uintx() const { return *((uintx*) addr); } 114 void set_uintx(uintx value) { *((uintx*) addr) = value; } 115 116 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 117 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 118 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 119 120 bool is_double() const { return strcmp(type, "double") == 0; } 121 double get_double() const { return *((double*) addr); } 122 void set_double(double value) { *((double*) addr) = value; } 123 124 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 125 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 126 ccstr get_ccstr() const { return *((ccstr*) addr); } 127 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 128 129 bool is_unlocker() const; 130 bool is_unlocked() const; 131 bool is_writeable() const; 132 bool is_external() const; 133 134 void print_on(outputStream* st); 135 void print_as_flag(outputStream* st); 136}; 137 138// debug flags control various aspects of the VM and are global accessible 139 140// use FlagSetting to temporarily change some debug flag 141// e.g. FlagSetting fs(DebugThisAndThat, true); 142// restored to previous value upon leaving scope 143class FlagSetting { 144 bool val; 145 bool* flag; 146 public: 147 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 148 ~FlagSetting() { *flag = val; } 149}; 150 151 152class CounterSetting { 153 intx* counter; 154 public: 155 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 156 ~CounterSetting() { (*counter)--; } 157}; 158 159 160class IntFlagSetting { 161 intx val; 162 intx* flag; 163 public: 164 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 165 ~IntFlagSetting() { *flag = val; } 166}; 167 168 169class DoubleFlagSetting { 170 double val; 171 double* flag; 172 public: 173 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 174 ~DoubleFlagSetting() { *flag = val; } 175}; 176 177 178class CommandLineFlags { 179 public: 180 static bool boolAt(char* name, size_t len, bool* value); 181 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 182 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 183 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 184 185 static bool intxAt(char* name, size_t len, intx* value); 186 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 187 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 188 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 189 190 static bool uintxAt(char* name, size_t len, uintx* value); 191 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 192 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 193 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 194 195 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 196 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 197 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 198 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 199 200 static bool doubleAt(char* name, size_t len, double* value); 201 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 202 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 203 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 204 205 static bool ccstrAt(char* name, size_t len, ccstr* value); 206 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 207 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 208 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 209 210 // Returns false if name is not a command line flag. 211 static bool wasSetOnCmdline(const char* name, bool* value); 212 static void printSetFlags(); 213 214 static void printFlags(); 215 216 static void verify() PRODUCT_RETURN; 217}; 218 219// use this for flags that are true by default in the debug version but 220// false in the optimized version, and vice versa 221#ifdef ASSERT 222#define trueInDebug true 223#define falseInDebug false 224#else 225#define trueInDebug false 226#define falseInDebug true 227#endif 228 229// use this for flags that are true per default in the product build 230// but false in development builds, and vice versa 231#ifdef PRODUCT 232#define trueInProduct true 233#define falseInProduct false 234#else 235#define trueInProduct false 236#define falseInProduct true 237#endif 238 239// use this for flags that are true per default in the tiered build 240// but false in non-tiered builds, and vice versa 241#ifdef TIERED 242#define trueInTiered true 243#define falseInTiered false 244#else 245#define trueInTiered false 246#define falseInTiered true 247#endif 248 249// develop flags are settable / visible only during development and are constant in the PRODUCT version 250// product flags are always settable / visible 251// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 252 253// A flag must be declared with one of the following types: 254// bool, intx, uintx, ccstr. 255// The type "ccstr" is an alias for "const char*" and is used 256// only in this file, because the macrology requires single-token type names. 257 258// Note: Diagnostic options not meant for VM tuning or for product modes. 259// They are to be used for VM quality assurance or field diagnosis 260// of VM bugs. They are hidden so that users will not be encouraged to 261// try them as if they were VM ordinary execution options. However, they 262// are available in the product version of the VM. Under instruction 263// from support engineers, VM customers can turn them on to collect 264// diagnostic information about VM problems. To use a VM diagnostic 265// option, you must first specify +UnlockDiagnosticVMOptions. 266// (This master switch also affects the behavior of -Xprintflags.) 267// 268// experimental flags are in support of features that are not 269// part of the officially supported product, but are available 270// for experimenting with. They could, for example, be performance 271// features that may not have undergone full or rigorous QA, but which may 272// help performance in some cases and released for experimentation 273// by the community of users and developers. This flag also allows one to 274// be able to build a fully supported product that nonetheless also 275// ships with some unsupported, lightly tested, experimental features. 276// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 277// UnlockExperimentalVMOptions flag, which allows the control and 278// modification of the experimental flags. 279// 280// manageable flags are writeable external product flags. 281// They are dynamically writeable through the JDK management interface 282// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 283// These flags are external exported interface (see CCC). The list of 284// manageable flags can be queried programmatically through the management 285// interface. 286// 287// A flag can be made as "manageable" only if 288// - the flag is defined in a CCC as an external exported interface. 289// - the VM implementation supports dynamic setting of the flag. 290// This implies that the VM must *always* query the flag variable 291// and not reuse state related to the flag state at any given time. 292// - you want the flag to be queried programmatically by the customers. 293// 294// product_rw flags are writeable internal product flags. 295// They are like "manageable" flags but for internal/private use. 296// The list of product_rw flags are internal/private flags which 297// may be changed/removed in a future release. It can be set 298// through the management interface to get/set value 299// when the name of flag is supplied. 300// 301// A flag can be made as "product_rw" only if 302// - the VM implementation supports dynamic setting of the flag. 303// This implies that the VM must *always* query the flag variable 304// and not reuse state related to the flag state at any given time. 305// 306// Note that when there is a need to support develop flags to be writeable, 307// it can be done in the same way as product_rw. 308 309#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 310 \ 311 lp64_product(bool, UseCompressedOops, false, \ 312 "Use 32-bit object references in 64-bit VM. " \ 313 "lp64_product means flag is always constant in 32 bit VM") \ 314 \ 315 notproduct(bool, CheckCompressedOops, true, \ 316 "generate checks in encoding/decoding code in debug VM") \ 317 \ 318 product_pd(uintx, HeapBaseMinAddress, \ 319 "OS specific low limit for heap base address") \ 320 \ 321 diagnostic(bool, PrintCompressedOopsMode, false, \ 322 "Print compressed oops base address and encoding mode") \ 323 \ 324 /* UseMembar is theoretically a temp flag used for memory barrier \ 325 * removal testing. It was supposed to be removed before FCS but has \ 326 * been re-added (see 6401008) */ \ 327 product(bool, UseMembar, false, \ 328 "(Unstable) Issues membars on thread state transitions") \ 329 \ 330 /* Temporary: See 6948537 */ \ 331 experimental(bool, UseMemSetInBOT, true, \ 332 "(Unstable) uses memset in BOT updates in GC code") \ 333 \ 334 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 335 "Enable normal processing of flags relating to field diagnostics")\ 336 \ 337 experimental(bool, UnlockExperimentalVMOptions, false, \ 338 "Enable normal processing of flags relating to experimental features")\ 339 \ 340 product(bool, JavaMonitorsInStackTrace, true, \ 341 "Print info. about Java monitor locks when the stacks are dumped")\ 342 \ 343 product_pd(bool, UseLargePages, \ 344 "Use large page memory") \ 345 \ 346 product_pd(bool, UseLargePagesIndividualAllocation, \ 347 "Allocate large pages individually for better affinity") \ 348 \ 349 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 350 "Fail large pages individual allocation") \ 351 \ 352 develop(bool, TracePageSizes, false, \ 353 "Trace page size selection and usage.") \ 354 \ 355 product(bool, UseNUMA, false, \ 356 "Use NUMA if available") \ 357 \ 358 product(bool, ForceNUMA, false, \ 359 "Force NUMA optimizations on single-node/UMA systems") \ 360 \ 361 product(intx, NUMAChunkResizeWeight, 20, \ 362 "Percentage (0-100) used to weight the current sample when " \ 363 "computing exponentially decaying average for " \ 364 "AdaptiveNUMAChunkSizing") \ 365 \ 366 product(intx, NUMASpaceResizeRate, 1*G, \ 367 "Do not reallocate more that this amount per collection") \ 368 \ 369 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 370 "Enable adaptive chunk sizing for NUMA") \ 371 \ 372 product(bool, NUMAStats, false, \ 373 "Print NUMA stats in detailed heap information") \ 374 \ 375 product(intx, NUMAPageScanRate, 256, \ 376 "Maximum number of pages to include in the page scan procedure") \ 377 \ 378 product_pd(bool, NeedsDeoptSuspend, \ 379 "True for register window machines (sparc/ia64)") \ 380 \ 381 product(intx, UseSSE, 99, \ 382 "Highest supported SSE instructions set on x86/x64") \ 383 \ 384 product(uintx, LargePageSizeInBytes, 0, \ 385 "Large page size (0 to let VM choose the page size") \ 386 \ 387 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 388 "Use large pages if max heap is at least this big") \ 389 \ 390 product(bool, ForceTimeHighResolution, false, \ 391 "Using high time resolution(For Win32 only)") \ 392 \ 393 develop(bool, TraceItables, false, \ 394 "Trace initialization and use of itables") \ 395 \ 396 develop(bool, TracePcPatching, false, \ 397 "Trace usage of frame::patch_pc") \ 398 \ 399 develop(bool, TraceJumps, false, \ 400 "Trace assembly jumps in thread ring buffer") \ 401 \ 402 develop(bool, TraceRelocator, false, \ 403 "Trace the bytecode relocator") \ 404 \ 405 develop(bool, TraceLongCompiles, false, \ 406 "Print out every time compilation is longer than " \ 407 "a given threashold") \ 408 \ 409 develop(bool, SafepointALot, false, \ 410 "Generates a lot of safepoints. Works with " \ 411 "GuaranteedSafepointInterval") \ 412 \ 413 product_pd(bool, BackgroundCompilation, \ 414 "A thread requesting compilation is not blocked during " \ 415 "compilation") \ 416 \ 417 product(bool, PrintVMQWaitTime, false, \ 418 "Prints out the waiting time in VM operation queue") \ 419 \ 420 develop(bool, BailoutToInterpreterForThrows, false, \ 421 "Compiled methods which throws/catches exceptions will be " \ 422 "deopt and intp.") \ 423 \ 424 develop(bool, NoYieldsInMicrolock, false, \ 425 "Disable yields in microlock") \ 426 \ 427 develop(bool, TraceOopMapGeneration, false, \ 428 "Shows oopmap generation") \ 429 \ 430 product(bool, MethodFlushing, true, \ 431 "Reclamation of zombie and not-entrant methods") \ 432 \ 433 develop(bool, VerifyStack, false, \ 434 "Verify stack of each thread when it is entering a runtime call") \ 435 \ 436 develop(bool, ForceUnreachable, false, \ 437 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 438 \ 439 notproduct(bool, StressDerivedPointers, false, \ 440 "Force scavenge when a derived pointers is detected on stack " \ 441 "after rtm call") \ 442 \ 443 develop(bool, TraceDerivedPointers, false, \ 444 "Trace traversal of derived pointers on stack") \ 445 \ 446 notproduct(bool, TraceCodeBlobStacks, false, \ 447 "Trace stack-walk of codeblobs") \ 448 \ 449 product(bool, PrintJNIResolving, false, \ 450 "Used to implement -v:jni") \ 451 \ 452 notproduct(bool, PrintRewrites, false, \ 453 "Print methods that are being rewritten") \ 454 \ 455 product(bool, UseInlineCaches, true, \ 456 "Use Inline Caches for virtual calls ") \ 457 \ 458 develop(bool, InlineArrayCopy, true, \ 459 "inline arraycopy native that is known to be part of " \ 460 "base library DLL") \ 461 \ 462 develop(bool, InlineObjectHash, true, \ 463 "inline Object::hashCode() native that is known to be part " \ 464 "of base library DLL") \ 465 \ 466 develop(bool, InlineObjectCopy, true, \ 467 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 468 \ 469 develop(bool, InlineNatives, true, \ 470 "inline natives that are known to be part of base library DLL") \ 471 \ 472 develop(bool, InlineMathNatives, true, \ 473 "inline SinD, CosD, etc.") \ 474 \ 475 develop(bool, InlineClassNatives, true, \ 476 "inline Class.isInstance, etc") \ 477 \ 478 develop(bool, InlineAtomicLong, true, \ 479 "inline sun.misc.AtomicLong") \ 480 \ 481 develop(bool, InlineThreadNatives, true, \ 482 "inline Thread.currentThread, etc") \ 483 \ 484 develop(bool, InlineReflectionGetCallerClass, true, \ 485 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 486 "of base library DLL") \ 487 \ 488 develop(bool, InlineUnsafeOps, true, \ 489 "inline memory ops (native methods) from sun.misc.Unsafe") \ 490 \ 491 develop(bool, ConvertCmpD2CmpF, true, \ 492 "Convert cmpD to cmpF when one input is constant in float range") \ 493 \ 494 develop(bool, ConvertFloat2IntClipping, true, \ 495 "Convert float2int clipping idiom to integer clipping") \ 496 \ 497 develop(bool, SpecialStringCompareTo, true, \ 498 "special version of string compareTo") \ 499 \ 500 develop(bool, SpecialStringIndexOf, true, \ 501 "special version of string indexOf") \ 502 \ 503 develop(bool, SpecialStringEquals, true, \ 504 "special version of string equals") \ 505 \ 506 develop(bool, SpecialArraysEquals, true, \ 507 "special version of Arrays.equals(char[],char[])") \ 508 \ 509 product(bool, UseSSE42Intrinsics, false, \ 510 "SSE4.2 versions of intrinsics") \ 511 \ 512 develop(bool, TraceCallFixup, false, \ 513 "traces all call fixups") \ 514 \ 515 develop(bool, DeoptimizeALot, false, \ 516 "deoptimize at every exit from the runtime system") \ 517 \ 518 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 519 "a comma separated list of bcis to deoptimize at") \ 520 \ 521 product(bool, DeoptimizeRandom, false, \ 522 "deoptimize random frames on random exit from the runtime system")\ 523 \ 524 notproduct(bool, ZombieALot, false, \ 525 "creates zombies (non-entrant) at exit from the runt. system") \ 526 \ 527 notproduct(bool, WalkStackALot, false, \ 528 "trace stack (no print) at every exit from the runtime system") \ 529 \ 530 develop(bool, Debugging, false, \ 531 "set when executing debug methods in debug.ccp " \ 532 "(to prevent triggering assertions)") \ 533 \ 534 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 535 "Enable strict checks that safepoints cannot happen for threads " \ 536 "that used No_Safepoint_Verifier") \ 537 \ 538 notproduct(bool, VerifyLastFrame, false, \ 539 "Verify oops on last frame on entry to VM") \ 540 \ 541 develop(bool, TraceHandleAllocation, false, \ 542 "Prints out warnings when suspicious many handles are allocated") \ 543 \ 544 product(bool, UseCompilerSafepoints, true, \ 545 "Stop at safepoints in compiled code") \ 546 \ 547 product(bool, UseSplitVerifier, true, \ 548 "use split verifier with StackMapTable attributes") \ 549 \ 550 product(bool, FailOverToOldVerifier, true, \ 551 "fail over to old verifier when split verifier fails") \ 552 \ 553 develop(bool, ShowSafepointMsgs, false, \ 554 "Show msg. about safepoint synch.") \ 555 \ 556 product(bool, SafepointTimeout, false, \ 557 "Time out and warn or fail after SafepointTimeoutDelay " \ 558 "milliseconds if failed to reach safepoint") \ 559 \ 560 develop(bool, DieOnSafepointTimeout, false, \ 561 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 562 \ 563 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 564 /* typically, at most a few retries are needed */ \ 565 product(intx, SuspendRetryCount, 50, \ 566 "Maximum retry count for an external suspend request") \ 567 \ 568 product(intx, SuspendRetryDelay, 5, \ 569 "Milliseconds to delay per retry (* current_retry_count)") \ 570 \ 571 product(bool, AssertOnSuspendWaitFailure, false, \ 572 "Assert/Guarantee on external suspend wait failure") \ 573 \ 574 product(bool, TraceSuspendWaitFailures, false, \ 575 "Trace external suspend wait failures") \ 576 \ 577 product(bool, MaxFDLimit, true, \ 578 "Bump the number of file descriptors to max in solaris.") \ 579 \ 580 notproduct(bool, LogEvents, trueInDebug, \ 581 "Enable Event log") \ 582 \ 583 product(bool, BytecodeVerificationRemote, true, \ 584 "Enables the Java bytecode verifier for remote classes") \ 585 \ 586 product(bool, BytecodeVerificationLocal, false, \ 587 "Enables the Java bytecode verifier for local classes") \ 588 \ 589 develop(bool, ForceFloatExceptions, trueInDebug, \ 590 "Force exceptions on FP stack under/overflow") \ 591 \ 592 develop(bool, SoftMatchFailure, trueInProduct, \ 593 "If the DFA fails to match a node, print a message and bail out") \ 594 \ 595 develop(bool, VerifyStackAtCalls, false, \ 596 "Verify that the stack pointer is unchanged after calls") \ 597 \ 598 develop(bool, TraceJavaAssertions, false, \ 599 "Trace java language assertions") \ 600 \ 601 notproduct(bool, CheckAssertionStatusDirectives, false, \ 602 "temporary - see javaClasses.cpp") \ 603 \ 604 notproduct(bool, PrintMallocFree, false, \ 605 "Trace calls to C heap malloc/free allocation") \ 606 \ 607 notproduct(bool, PrintOopAddress, false, \ 608 "Always print the location of the oop") \ 609 \ 610 notproduct(bool, VerifyCodeCacheOften, false, \ 611 "Verify compiled-code cache often") \ 612 \ 613 develop(bool, ZapDeadCompiledLocals, false, \ 614 "Zap dead locals in compiler frames") \ 615 \ 616 notproduct(bool, ZapDeadLocalsOld, false, \ 617 "Zap dead locals (old version, zaps all frames when " \ 618 "entering the VM") \ 619 \ 620 notproduct(bool, CheckOopishValues, false, \ 621 "Warn if value contains oop ( requires ZapDeadLocals)") \ 622 \ 623 develop(bool, UseMallocOnly, false, \ 624 "use only malloc/free for allocation (no resource area/arena)") \ 625 \ 626 develop(bool, PrintMalloc, false, \ 627 "print all malloc/free calls") \ 628 \ 629 develop(bool, ZapResourceArea, trueInDebug, \ 630 "Zap freed resource/arena space with 0xABABABAB") \ 631 \ 632 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 633 "Zap freed VM handle space with 0xBCBCBCBC") \ 634 \ 635 develop(bool, ZapJNIHandleArea, trueInDebug, \ 636 "Zap freed JNI handle space with 0xFEFEFEFE") \ 637 \ 638 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 639 "Zap unused heap space with 0xBAADBABE") \ 640 \ 641 develop(bool, TraceZapUnusedHeapArea, false, \ 642 "Trace zapping of unused heap space") \ 643 \ 644 develop(bool, CheckZapUnusedHeapArea, false, \ 645 "Check zapping of unused heap space") \ 646 \ 647 develop(bool, ZapFillerObjects, trueInDebug, \ 648 "Zap filler objects with 0xDEAFBABE") \ 649 \ 650 develop(bool, PrintVMMessages, true, \ 651 "Print vm messages on console") \ 652 \ 653 product(bool, PrintGCApplicationConcurrentTime, false, \ 654 "Print the time the application has been running") \ 655 \ 656 product(bool, PrintGCApplicationStoppedTime, false, \ 657 "Print the time the application has been stopped") \ 658 \ 659 notproduct(uintx, ErrorHandlerTest, 0, \ 660 "If > 0, provokes an error after VM initialization; the value" \ 661 "determines which error to provoke. See test_error_handler()" \ 662 "in debug.cpp.") \ 663 \ 664 develop(bool, Verbose, false, \ 665 "Prints additional debugging information from other modes") \ 666 \ 667 develop(bool, PrintMiscellaneous, false, \ 668 "Prints uncategorized debugging information (requires +Verbose)") \ 669 \ 670 develop(bool, WizardMode, false, \ 671 "Prints much more debugging information") \ 672 \ 673 product(bool, ShowMessageBoxOnError, false, \ 674 "Keep process alive on VM fatal error") \ 675 \ 676 product_pd(bool, UseOSErrorReporting, \ 677 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 678 \ 679 product(bool, SuppressFatalErrorMessage, false, \ 680 "Do NO Fatal Error report [Avoid deadlock]") \ 681 \ 682 product(ccstrlist, OnError, "", \ 683 "Run user-defined commands on fatal error; see VMError.cpp " \ 684 "for examples") \ 685 \ 686 product(ccstrlist, OnOutOfMemoryError, "", \ 687 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 688 \ 689 manageable(bool, HeapDumpBeforeFullGC, false, \ 690 "Dump heap to file before any major stop-world GC") \ 691 \ 692 manageable(bool, HeapDumpAfterFullGC, false, \ 693 "Dump heap to file after any major stop-world GC") \ 694 \ 695 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 696 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 697 \ 698 manageable(ccstr, HeapDumpPath, NULL, \ 699 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 700 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 701 "in the working directory)") \ 702 \ 703 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 704 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 705 "when the heap usage is larger than this") \ 706 \ 707 develop(uintx, HeapDumpSegmentSize, 1*G, \ 708 "Approximate segment size when generating a segmented heap dump") \ 709 \ 710 develop(bool, BreakAtWarning, false, \ 711 "Execute breakpoint upon encountering VM warning") \ 712 \ 713 product_pd(bool, UseVectoredExceptions, \ 714 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 715 \ 716 develop(bool, TraceVMOperation, false, \ 717 "Trace vm operations") \ 718 \ 719 develop(bool, UseFakeTimers, false, \ 720 "Tells whether the VM should use system time or a fake timer") \ 721 \ 722 diagnostic(bool, LogCompilation, false, \ 723 "Log compilation activity in detail to hotspot.log or LogFile") \ 724 \ 725 product(bool, PrintCompilation, false, \ 726 "Print compilations") \ 727 \ 728 diagnostic(bool, TraceNMethodInstalls, false, \ 729 "Trace nmethod intallation") \ 730 \ 731 diagnostic(intx, ScavengeRootsInCode, 0, \ 732 "0: do not allow scavengable oops in the code cache; " \ 733 "1: allow scavenging from the code cache; " \ 734 "2: emit as many constants as the compiler can see") \ 735 \ 736 diagnostic(bool, TraceOSRBreakpoint, false, \ 737 "Trace OSR Breakpoint ") \ 738 \ 739 diagnostic(bool, TraceCompileTriggered, false, \ 740 "Trace compile triggered") \ 741 \ 742 diagnostic(bool, TraceTriggers, false, \ 743 "Trace triggers") \ 744 \ 745 product(bool, AlwaysRestoreFPU, false, \ 746 "Restore the FPU control word after every JNI call (expensive)") \ 747 \ 748 notproduct(bool, PrintCompilation2, false, \ 749 "Print additional statistics per compilation") \ 750 \ 751 diagnostic(bool, PrintAdapterHandlers, false, \ 752 "Print code generated for i2c/c2i adapters") \ 753 \ 754 develop(bool, VerifyAdapterSharing, false, \ 755 "Verify that the code for shared adapters is the equivalent") \ 756 \ 757 diagnostic(bool, PrintAssembly, false, \ 758 "Print assembly code (using external disassembler.so)") \ 759 \ 760 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 761 "Options string passed to disassembler.so") \ 762 \ 763 diagnostic(bool, PrintNMethods, false, \ 764 "Print assembly code for nmethods when generated") \ 765 \ 766 diagnostic(bool, PrintNativeNMethods, false, \ 767 "Print assembly code for native nmethods when generated") \ 768 \ 769 develop(bool, PrintDebugInfo, false, \ 770 "Print debug information for all nmethods when generated") \ 771 \ 772 develop(bool, PrintRelocations, false, \ 773 "Print relocation information for all nmethods when generated") \ 774 \ 775 develop(bool, PrintDependencies, false, \ 776 "Print dependency information for all nmethods when generated") \ 777 \ 778 develop(bool, PrintExceptionHandlers, false, \ 779 "Print exception handler tables for all nmethods when generated") \ 780 \ 781 develop(bool, InterceptOSException, false, \ 782 "Starts debugger when an implicit OS (e.g., NULL) " \ 783 "exception happens") \ 784 \ 785 notproduct(bool, PrintCodeCache, false, \ 786 "Print the compiled_code cache when exiting") \ 787 \ 788 develop(bool, PrintCodeCache2, false, \ 789 "Print detailed info on the compiled_code cache when exiting") \ 790 \ 791 diagnostic(bool, PrintStubCode, false, \ 792 "Print generated stub code") \ 793 \ 794 product(bool, StackTraceInThrowable, true, \ 795 "Collect backtrace in throwable when exception happens") \ 796 \ 797 product(bool, OmitStackTraceInFastThrow, true, \ 798 "Omit backtraces for some 'hot' exceptions in optimized code") \ 799 \ 800 product(bool, ProfilerPrintByteCodeStatistics, false, \ 801 "Prints byte code statictics when dumping profiler output") \ 802 \ 803 product(bool, ProfilerRecordPC, false, \ 804 "Collects tick for each 16 byte interval of compiled code") \ 805 \ 806 product(bool, ProfileVM, false, \ 807 "Profiles ticks that fall within VM (either in the VM Thread " \ 808 "or VM code called through stubs)") \ 809 \ 810 product(bool, ProfileIntervals, false, \ 811 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 812 \ 813 notproduct(bool, ProfilerCheckIntervals, false, \ 814 "Collect and print info on spacing of profiler ticks") \ 815 \ 816 develop(bool, PrintJVMWarnings, false, \ 817 "Prints warnings for unimplemented JVM functions") \ 818 \ 819 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 820 "Prints warnings for stalled SpinLocks") \ 821 \ 822 develop(bool, InitializeJavaLangSystem, true, \ 823 "Initialize java.lang.System - turn off for individual " \ 824 "method debugging") \ 825 \ 826 develop(bool, InitializeJavaLangString, true, \ 827 "Initialize java.lang.String - turn off for individual " \ 828 "method debugging") \ 829 \ 830 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 831 "Initialize various error and exception classes - turn off for " \ 832 "individual method debugging") \ 833 \ 834 product(bool, RegisterFinalizersAtInit, true, \ 835 "Register finalizable objects at end of Object.<init> or " \ 836 "after allocation") \ 837 \ 838 develop(bool, RegisterReferences, true, \ 839 "Tells whether the VM should register soft/weak/final/phantom " \ 840 "references") \ 841 \ 842 develop(bool, IgnoreRewrites, false, \ 843 "Supress rewrites of bytecodes in the oopmap generator. " \ 844 "This is unsafe!") \ 845 \ 846 develop(bool, PrintCodeCacheExtension, false, \ 847 "Print extension of code cache") \ 848 \ 849 develop(bool, UsePrivilegedStack, true, \ 850 "Enable the security JVM functions") \ 851 \ 852 develop(bool, IEEEPrecision, true, \ 853 "Enables IEEE precision (for INTEL only)") \ 854 \ 855 develop(bool, ProtectionDomainVerification, true, \ 856 "Verifies protection domain before resolution in system " \ 857 "dictionary") \ 858 \ 859 product(bool, ClassUnloading, true, \ 860 "Do unloading of classes") \ 861 \ 862 diagnostic(bool, LinkWellKnownClasses, false, \ 863 "Resolve a well known class as soon as its name is seen") \ 864 \ 865 develop(bool, DisableStartThread, false, \ 866 "Disable starting of additional Java threads " \ 867 "(for debugging only)") \ 868 \ 869 develop(bool, MemProfiling, false, \ 870 "Write memory usage profiling to log file") \ 871 \ 872 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 873 "Prints the system dictionary at exit") \ 874 \ 875 diagnostic(bool, UnsyncloadClass, false, \ 876 "Unstable: VM calls loadClass unsynchronized. Custom " \ 877 "class loader must call VM synchronized for findClass " \ 878 "and defineClass.") \ 879 \ 880 product(bool, AlwaysLockClassLoader, false, \ 881 "Require the VM to acquire the class loader lock before calling " \ 882 "loadClass() even for class loaders registering " \ 883 "as parallel capable") \ 884 \ 885 product(bool, AllowParallelDefineClass, false, \ 886 "Allow parallel defineClass requests for class loaders " \ 887 "registering as parallel capable") \ 888 \ 889 product(bool, MustCallLoadClassInternal, false, \ 890 "Call loadClassInternal() rather than loadClass()") \ 891 \ 892 product_pd(bool, DontYieldALot, \ 893 "Throw away obvious excess yield calls (for SOLARIS only)") \ 894 \ 895 product_pd(bool, ConvertSleepToYield, \ 896 "Converts sleep(0) to thread yield " \ 897 "(may be off for SOLARIS to improve GUI)") \ 898 \ 899 product(bool, ConvertYieldToSleep, false, \ 900 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 901 "behavior (SOLARIS only)") \ 902 \ 903 product(bool, UseBoundThreads, true, \ 904 "Bind user level threads to kernel threads (for SOLARIS only)") \ 905 \ 906 develop(bool, UseDetachedThreads, true, \ 907 "Use detached threads that are recycled upon termination " \ 908 "(for SOLARIS only)") \ 909 \ 910 product(bool, UseLWPSynchronization, true, \ 911 "Use LWP-based instead of libthread-based synchronization " \ 912 "(SPARC only)") \ 913 \ 914 product(ccstr, SyncKnobs, NULL, \ 915 "(Unstable) Various monitor synchronization tunables") \ 916 \ 917 product(intx, EmitSync, 0, \ 918 "(Unsafe,Unstable) " \ 919 " Controls emission of inline sync fast-path code") \ 920 \ 921 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 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 /* change to false by default sometime after Mustang */ \ 1121 product(bool, VerifyMergedCPBytecodes, true, \ 1122 "Verify bytecodes after RedefineClasses constant pool merging") \ 1123 \ 1124 develop(bool, TraceJNIHandleAllocation, false, \ 1125 "Trace allocation/deallocation of JNI handle blocks") \ 1126 \ 1127 develop(bool, TraceThreadEvents, false, \ 1128 "Trace all thread events") \ 1129 \ 1130 develop(bool, TraceBytecodes, false, \ 1131 "Trace bytecode execution") \ 1132 \ 1133 develop(bool, TraceClassInitialization, false, \ 1134 "Trace class initialization") \ 1135 \ 1136 develop(bool, TraceExceptions, false, \ 1137 "Trace exceptions") \ 1138 \ 1139 develop(bool, TraceICs, false, \ 1140 "Trace inline cache changes") \ 1141 \ 1142 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1143 "Trace method invocation counter overflow") \ 1144 \ 1145 develop(bool, TraceInlineCacheClearing, false, \ 1146 "Trace clearing of inline caches in nmethods") \ 1147 \ 1148 develop(bool, TraceDependencies, false, \ 1149 "Trace dependencies") \ 1150 \ 1151 develop(bool, VerifyDependencies, trueInDebug, \ 1152 "Exercise and verify the compilation dependency mechanism") \ 1153 \ 1154 develop(bool, TraceNewOopMapGeneration, false, \ 1155 "Trace OopMapGeneration") \ 1156 \ 1157 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1158 "Trace OopMapGeneration: print detailed cell states") \ 1159 \ 1160 develop(bool, TimeOopMap, false, \ 1161 "Time calls to GenerateOopMap::compute_map() in sum") \ 1162 \ 1163 develop(bool, TimeOopMap2, false, \ 1164 "Time calls to GenerateOopMap::compute_map() individually") \ 1165 \ 1166 develop(bool, TraceMonitorMismatch, false, \ 1167 "Trace monitor matching failures during OopMapGeneration") \ 1168 \ 1169 develop(bool, TraceOopMapRewrites, false, \ 1170 "Trace rewritting of method oops during oop map generation") \ 1171 \ 1172 develop(bool, TraceSafepoint, false, \ 1173 "Trace safepoint operations") \ 1174 \ 1175 develop(bool, TraceICBuffer, false, \ 1176 "Trace usage of IC buffer") \ 1177 \ 1178 develop(bool, TraceCompiledIC, false, \ 1179 "Trace changes of compiled IC") \ 1180 \ 1181 notproduct(bool, TraceZapDeadLocals, false, \ 1182 "Trace zapping dead locals") \ 1183 \ 1184 develop(bool, TraceStartupTime, false, \ 1185 "Trace setup time") \ 1186 \ 1187 develop(bool, TraceHPI, false, \ 1188 "Trace Host Porting Interface (HPI)") \ 1189 \ 1190 product(ccstr, HPILibPath, NULL, \ 1191 "Specify alternate path to HPI library") \ 1192 \ 1193 develop(bool, TraceProtectionDomainVerification, false, \ 1194 "Trace protection domain verifcation") \ 1195 \ 1196 develop(bool, TraceClearedExceptions, false, \ 1197 "Prints when an exception is forcibly cleared") \ 1198 \ 1199 product(bool, TraceClassResolution, false, \ 1200 "Trace all constant pool resolutions (for debugging)") \ 1201 \ 1202 product(bool, TraceBiasedLocking, false, \ 1203 "Trace biased locking in JVM") \ 1204 \ 1205 product(bool, TraceMonitorInflation, false, \ 1206 "Trace monitor inflation in JVM") \ 1207 \ 1208 /* assembler */ \ 1209 product(bool, Use486InstrsOnly, false, \ 1210 "Use 80486 Compliant instruction subset") \ 1211 \ 1212 /* gc */ \ 1213 \ 1214 product(bool, UseSerialGC, false, \ 1215 "Use the serial garbage collector") \ 1216 \ 1217 product(bool, UseG1GC, false, \ 1218 "Use the Garbage-First garbage collector") \ 1219 \ 1220 product(bool, UseParallelGC, false, \ 1221 "Use the Parallel Scavenge garbage collector") \ 1222 \ 1223 product(bool, UseParallelOldGC, false, \ 1224 "Use the Parallel Old garbage collector") \ 1225 \ 1226 product(bool, UseParallelOldGCCompacting, true, \ 1227 "In the Parallel Old garbage collector use parallel compaction") \ 1228 \ 1229 product(bool, UseParallelDensePrefixUpdate, true, \ 1230 "In the Parallel Old garbage collector use parallel dense" \ 1231 " prefix update") \ 1232 \ 1233 product(uintx, HeapMaximumCompactionInterval, 20, \ 1234 "How often should we maximally compact the heap (not allowing " \ 1235 "any dead space)") \ 1236 \ 1237 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1238 "The collection count for the first maximum compaction") \ 1239 \ 1240 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1241 "In the Parallel Old garbage collector maximum compaction for " \ 1242 "a system GC") \ 1243 \ 1244 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1245 "The mean used by the par compact dead wood" \ 1246 "limiter (a number between 0-100).") \ 1247 \ 1248 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1249 "The standard deviation used by the par compact dead wood" \ 1250 "limiter (a number between 0-100).") \ 1251 \ 1252 product(bool, UseParallelOldGCDensePrefix, true, \ 1253 "Use a dense prefix with the Parallel Old garbage collector") \ 1254 \ 1255 product(uintx, ParallelGCThreads, 0, \ 1256 "Number of parallel threads parallel gc will use") \ 1257 \ 1258 develop(bool, ParallelOldGCSplitALot, false, \ 1259 "Provoke splitting (copying data from a young gen space to" \ 1260 "multiple destination spaces)") \ 1261 \ 1262 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1263 "How often to provoke splitting a young gen space") \ 1264 \ 1265 develop(bool, TraceRegionTasksQueuing, false, \ 1266 "Trace the queuing of the region tasks") \ 1267 \ 1268 product(uintx, ConcGCThreads, 0, \ 1269 "Number of threads concurrent gc will use") \ 1270 \ 1271 product(uintx, YoungPLABSize, 4096, \ 1272 "Size of young gen promotion labs (in HeapWords)") \ 1273 \ 1274 product(uintx, OldPLABSize, 1024, \ 1275 "Size of old gen promotion labs (in HeapWords)") \ 1276 \ 1277 product(uintx, GCTaskTimeStampEntries, 200, \ 1278 "Number of time stamp entries per gc worker thread") \ 1279 \ 1280 product(bool, AlwaysTenure, false, \ 1281 "Always tenure objects in eden. (ParallelGC only)") \ 1282 \ 1283 product(bool, NeverTenure, false, \ 1284 "Never tenure objects in eden, May tenure on overflow " \ 1285 "(ParallelGC only)") \ 1286 \ 1287 product(bool, ScavengeBeforeFullGC, true, \ 1288 "Scavenge youngest generation before each full GC, " \ 1289 "used with UseParallelGC") \ 1290 \ 1291 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1292 "Allow scavenges to occur when to_space contains objects.") \ 1293 \ 1294 product(bool, UseConcMarkSweepGC, false, \ 1295 "Use Concurrent Mark-Sweep GC in the old generation") \ 1296 \ 1297 product(bool, ExplicitGCInvokesConcurrent, false, \ 1298 "A System.gc() request invokes a concurrent collection;" \ 1299 " (effective only when UseConcMarkSweepGC)") \ 1300 \ 1301 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1302 "A System.gc() request invokes a concurrent collection and " \ 1303 "also unloads classes during such a concurrent gc cycle " \ 1304 "(effective only when UseConcMarkSweepGC)") \ 1305 \ 1306 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1307 "Use Adaptive Free Lists in the CMS generation") \ 1308 \ 1309 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1310 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1311 \ 1312 develop(bool, RotateCMSCollectionTypes, false, \ 1313 "Rotate the CMS collections among concurrent and STW") \ 1314 \ 1315 product(bool, UseCMSBestFit, true, \ 1316 "Use CMS best fit allocation strategy") \ 1317 \ 1318 product(bool, UseCMSCollectionPassing, true, \ 1319 "Use passing of collection from background to foreground") \ 1320 \ 1321 product(bool, UseParNewGC, false, \ 1322 "Use parallel threads in the new generation.") \ 1323 \ 1324 product(bool, ParallelGCVerbose, false, \ 1325 "Verbose output for parallel GC.") \ 1326 \ 1327 product(intx, ParallelGCBufferWastePct, 10, \ 1328 "wasted fraction of parallel allocation buffer.") \ 1329 \ 1330 product(bool, ParallelGCRetainPLAB, true, \ 1331 "Retain parallel allocation buffers across scavenges.") \ 1332 \ 1333 product(intx, TargetPLABWastePct, 10, \ 1334 "target wasted space in last buffer as pct of overall allocation")\ 1335 \ 1336 product(uintx, PLABWeight, 75, \ 1337 "Percentage (0-100) used to weight the current sample when" \ 1338 "computing exponentially decaying average for ResizePLAB.") \ 1339 \ 1340 product(bool, ResizePLAB, true, \ 1341 "Dynamically resize (survivor space) promotion labs") \ 1342 \ 1343 product(bool, PrintPLAB, false, \ 1344 "Print (survivor space) promotion labs sizing decisions") \ 1345 \ 1346 product(intx, ParGCArrayScanChunk, 50, \ 1347 "Scan a subset and push remainder, if array is bigger than this") \ 1348 \ 1349 product(bool, ParGCUseLocalOverflow, false, \ 1350 "Instead of a global overflow list, use local overflow stacks") \ 1351 \ 1352 product(bool, ParGCTrimOverflow, true, \ 1353 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1354 \ 1355 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1356 "Whether we should simulate work queue overflow in ParNew") \ 1357 \ 1358 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1359 "An `interval' counter that determines how frequently " \ 1360 "we simulate overflow; a smaller number increases frequency") \ 1361 \ 1362 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1363 "The desired number of objects to claim from the overflow list") \ 1364 \ 1365 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1366 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1367 "parallel GC.") \ 1368 \ 1369 product(uintx, OldPLABWeight, 50, \ 1370 "Percentage (0-100) used to weight the current sample when" \ 1371 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1372 \ 1373 product(bool, ResizeOldPLAB, true, \ 1374 "Dynamically resize (old gen) promotion labs") \ 1375 \ 1376 product(bool, PrintOldPLAB, false, \ 1377 "Print (old gen) promotion labs sizing decisions") \ 1378 \ 1379 product(uintx, CMSOldPLABMin, 16, \ 1380 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1381 \ 1382 product(uintx, CMSOldPLABMax, 1024, \ 1383 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1384 \ 1385 product(uintx, CMSOldPLABNumRefills, 4, \ 1386 "Nominal number of refills of CMS gen promotion lab cache" \ 1387 " per worker per block size") \ 1388 \ 1389 product(bool, CMSOldPLABResizeQuicker, false, \ 1390 "Whether to react on-the-fly during a scavenge to a sudden" \ 1391 " change in block demand rate") \ 1392 \ 1393 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1394 "The tolerance of the phase-change detector for on-the-fly" \ 1395 " PLAB resizing during a scavenge") \ 1396 \ 1397 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1398 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1399 " during a scavenge") \ 1400 \ 1401 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1402 "The clamping of the gain in the feedback loop for on-the-fly" \ 1403 " PLAB resizing during a scavenge") \ 1404 \ 1405 product(bool, AlwaysPreTouch, false, \ 1406 "It forces all freshly committed pages to be pre-touched.") \ 1407 \ 1408 product(bool, CMSUseOldDefaults, false, \ 1409 "A flag temporarily introduced to allow reverting to some " \ 1410 "older default settings; older as of 6.0") \ 1411 \ 1412 product(intx, CMSYoungGenPerWorker, 16*M, \ 1413 "The amount of young gen chosen by default per GC worker " \ 1414 "thread available") \ 1415 \ 1416 product(bool, GCOverheadReporting, false, \ 1417 "Enables the GC overhead reporting facility") \ 1418 \ 1419 product(intx, GCOverheadReportingPeriodMS, 100, \ 1420 "Reporting period for conc GC overhead reporting, in ms ") \ 1421 \ 1422 product(bool, CMSIncrementalMode, false, \ 1423 "Whether CMS GC should operate in \"incremental\" mode") \ 1424 \ 1425 product(uintx, CMSIncrementalDutyCycle, 10, \ 1426 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1427 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1428 "value") \ 1429 \ 1430 product(bool, CMSIncrementalPacing, true, \ 1431 "Whether the CMS incremental mode duty cycle should be " \ 1432 "automatically adjusted") \ 1433 \ 1434 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1435 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1436 "enabled (a percentage, 0-100)") \ 1437 \ 1438 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1439 "Percentage (0-100) used to add conservatism when computing the " \ 1440 "duty cycle") \ 1441 \ 1442 product(uintx, CMSIncrementalOffset, 0, \ 1443 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1444 " is shifted to the right within the period between young GCs") \ 1445 \ 1446 product(uintx, CMSExpAvgFactor, 50, \ 1447 "Percentage (0-100) used to weight the current sample when" \ 1448 "computing exponential averages for CMS statistics.") \ 1449 \ 1450 product(uintx, CMS_FLSWeight, 75, \ 1451 "Percentage (0-100) used to weight the current sample when" \ 1452 "computing exponentially decating averages for CMS FLS statistics.") \ 1453 \ 1454 product(uintx, CMS_FLSPadding, 1, \ 1455 "The multiple of deviation from mean to use for buffering" \ 1456 "against volatility in free list demand.") \ 1457 \ 1458 product(uintx, FLSCoalescePolicy, 2, \ 1459 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1460 \ 1461 product(bool, FLSAlwaysCoalesceLarge, false, \ 1462 "CMS: Larger free blocks are always available for coalescing") \ 1463 \ 1464 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1465 "CMS: the smaller the percentage the greater the coalition force")\ 1466 \ 1467 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1468 "CMS: the factor by which to inflate estimated demand of small" \ 1469 " block sizes to prevent coalescing with an adjoining block") \ 1470 \ 1471 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1472 "CMS: the factor by which to inflate estimated demand of large" \ 1473 " block sizes to prevent coalescing with an adjoining block") \ 1474 \ 1475 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1476 "CMS: the factor by which to inflate estimated demand of small" \ 1477 " block sizes to prevent splitting to supply demand for smaller" \ 1478 " blocks") \ 1479 \ 1480 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1481 "CMS: the factor by which to inflate estimated demand of large" \ 1482 " block sizes to prevent splitting to supply demand for smaller" \ 1483 " blocks") \ 1484 \ 1485 product(bool, CMSExtrapolateSweep, false, \ 1486 "CMS: cushion for block demand during sweep") \ 1487 \ 1488 product(uintx, CMS_SweepWeight, 75, \ 1489 "Percentage (0-100) used to weight the current sample when " \ 1490 "computing exponentially decaying average for inter-sweep " \ 1491 "duration") \ 1492 \ 1493 product(uintx, CMS_SweepPadding, 1, \ 1494 "The multiple of deviation from mean to use for buffering " \ 1495 "against volatility in inter-sweep duration.") \ 1496 \ 1497 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1498 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1499 "duration exceeds this threhold in milliseconds") \ 1500 \ 1501 develop(bool, CMSTraceIncrementalMode, false, \ 1502 "Trace CMS incremental mode") \ 1503 \ 1504 develop(bool, CMSTraceIncrementalPacing, false, \ 1505 "Trace CMS incremental mode pacing computation") \ 1506 \ 1507 develop(bool, CMSTraceThreadState, false, \ 1508 "Trace the CMS thread state (enable the trace_state() method)") \ 1509 \ 1510 product(bool, CMSClassUnloadingEnabled, false, \ 1511 "Whether class unloading enabled when using CMS GC") \ 1512 \ 1513 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1514 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1515 " for which classes may not be unloaded") \ 1516 \ 1517 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1518 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1519 \ 1520 product(bool, UseCMSCompactAtFullCollection, true, \ 1521 "Use mark sweep compact at full collections") \ 1522 \ 1523 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1524 "Number of CMS full collection done before compaction if > 0") \ 1525 \ 1526 develop(intx, CMSDictionaryChoice, 0, \ 1527 "Use BinaryTreeDictionary as default in the CMS generation") \ 1528 \ 1529 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1530 "Replenish and indexed free list with this number of chunks") \ 1531 \ 1532 product(bool, CMSReplenishIntermediate, true, \ 1533 "Replenish all intermediate free-list caches") \ 1534 \ 1535 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1536 "When satisfying batched demand, splot blocks from the " \ 1537 "IndexedFreeList whose size is a multiple of requested size") \ 1538 \ 1539 product(bool, CMSLoopWarn, false, \ 1540 "Warn in case of excessive CMS looping") \ 1541 \ 1542 develop(bool, CMSOverflowEarlyRestoration, false, \ 1543 "Whether preserved marks should be restored early") \ 1544 \ 1545 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1546 "Size of marking stack") \ 1547 \ 1548 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1549 "Max size of marking stack") \ 1550 \ 1551 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1552 "Whether we should simulate frequent marking stack / work queue" \ 1553 " overflow") \ 1554 \ 1555 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1556 "An `interval' counter that determines how frequently" \ 1557 " we simulate overflow; a smaller number increases frequency") \ 1558 \ 1559 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1560 "(Temporary, subject to experimentation)" \ 1561 "Maximum number of abortable preclean iterations, if > 0") \ 1562 \ 1563 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1564 "(Temporary, subject to experimentation)" \ 1565 "Maximum time in abortable preclean in ms") \ 1566 \ 1567 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1568 "(Temporary, subject to experimentation)" \ 1569 "Nominal minimum work per abortable preclean iteration") \ 1570 \ 1571 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1572 "(Temporary, subject to experimentation)" \ 1573 " Time that we sleep between iterations when not given" \ 1574 " enough work per iteration") \ 1575 \ 1576 product(uintx, CMSRescanMultiple, 32, \ 1577 "Size (in cards) of CMS parallel rescan task") \ 1578 \ 1579 product(uintx, CMSConcMarkMultiple, 32, \ 1580 "Size (in cards) of CMS concurrent MT marking task") \ 1581 \ 1582 product(uintx, CMSRevisitStackSize, 1*M, \ 1583 "Size of CMS KlassKlass revisit stack") \ 1584 \ 1585 product(bool, CMSAbortSemantics, false, \ 1586 "Whether abort-on-overflow semantics is implemented") \ 1587 \ 1588 product(bool, CMSParallelRemarkEnabled, true, \ 1589 "Whether parallel remark enabled (only if ParNewGC)") \ 1590 \ 1591 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1592 "Whether parallel remark of survivor space" \ 1593 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1594 \ 1595 product(bool, CMSPLABRecordAlways, true, \ 1596 "Whether to always record survivor space PLAB bdries" \ 1597 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1598 \ 1599 product(bool, CMSConcurrentMTEnabled, true, \ 1600 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1601 \ 1602 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1603 "Whether concurrent precleaning enabled in perm gen" \ 1604 " (effective only when CMSPrecleaningEnabled is true)") \ 1605 \ 1606 product(bool, CMSPrecleaningEnabled, true, \ 1607 "Whether concurrent precleaning enabled") \ 1608 \ 1609 product(uintx, CMSPrecleanIter, 3, \ 1610 "Maximum number of precleaning iteration passes") \ 1611 \ 1612 product(uintx, CMSPrecleanNumerator, 2, \ 1613 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1614 " ratio") \ 1615 \ 1616 product(uintx, CMSPrecleanDenominator, 3, \ 1617 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1618 " ratio") \ 1619 \ 1620 product(bool, CMSPrecleanRefLists1, true, \ 1621 "Preclean ref lists during (initial) preclean phase") \ 1622 \ 1623 product(bool, CMSPrecleanRefLists2, false, \ 1624 "Preclean ref lists during abortable preclean phase") \ 1625 \ 1626 product(bool, CMSPrecleanSurvivors1, false, \ 1627 "Preclean survivors during (initial) preclean phase") \ 1628 \ 1629 product(bool, CMSPrecleanSurvivors2, true, \ 1630 "Preclean survivors during abortable preclean phase") \ 1631 \ 1632 product(uintx, CMSPrecleanThreshold, 1000, \ 1633 "Don't re-iterate if #dirty cards less than this") \ 1634 \ 1635 product(bool, CMSCleanOnEnter, true, \ 1636 "Clean-on-enter optimization for reducing number of dirty cards") \ 1637 \ 1638 product(uintx, CMSRemarkVerifyVariant, 1, \ 1639 "Choose variant (1,2) of verification following remark") \ 1640 \ 1641 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1642 "If Eden used is below this value, don't try to schedule remark") \ 1643 \ 1644 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1645 "The Eden occupancy % at which to try and schedule remark pause") \ 1646 \ 1647 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1648 "Start sampling Eden top at least before yg occupancy reaches" \ 1649 " 1/<ratio> of the size at which we plan to schedule remark") \ 1650 \ 1651 product(uintx, CMSSamplingGrain, 16*K, \ 1652 "The minimum distance between eden samples for CMS (see above)") \ 1653 \ 1654 product(bool, CMSScavengeBeforeRemark, false, \ 1655 "Attempt scavenge before the CMS remark step") \ 1656 \ 1657 develop(bool, CMSTraceSweeper, false, \ 1658 "Trace some actions of the CMS sweeper") \ 1659 \ 1660 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1661 "Don't drain below this size per parallel worker/thief") \ 1662 \ 1663 product(intx, CMSWaitDuration, 2000, \ 1664 "Time in milliseconds that CMS thread waits for young GC") \ 1665 \ 1666 product(bool, CMSYield, true, \ 1667 "Yield between steps of concurrent mark & sweep") \ 1668 \ 1669 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1670 "Bitmap operations should process at most this many bits" \ 1671 "between yields") \ 1672 \ 1673 product(bool, CMSDumpAtPromotionFailure, false, \ 1674 "Dump useful information about the state of the CMS old " \ 1675 " generation upon a promotion failure.") \ 1676 \ 1677 product(bool, CMSPrintChunksInDump, false, \ 1678 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1679 " more detailed information about the free chunks.") \ 1680 \ 1681 product(bool, CMSPrintObjectsInDump, false, \ 1682 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1683 " more detailed information about the allocated objects.") \ 1684 \ 1685 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1686 "Verify that all refs across the FLS boundary " \ 1687 " are to valid objects") \ 1688 \ 1689 diagnostic(bool, FLSVerifyLists, false, \ 1690 "Do lots of (expensive) FreeListSpace verification") \ 1691 \ 1692 diagnostic(bool, FLSVerifyIndexTable, false, \ 1693 "Do lots of (expensive) FLS index table verification") \ 1694 \ 1695 develop(bool, FLSVerifyDictionary, false, \ 1696 "Do lots of (expensive) FLS dictionary verification") \ 1697 \ 1698 develop(bool, VerifyBlockOffsetArray, false, \ 1699 "Do (expensive!) block offset array verification") \ 1700 \ 1701 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1702 "Maintain _unallocated_block in BlockOffsetArray" \ 1703 " (currently applicable only to CMS collector)") \ 1704 \ 1705 develop(bool, TraceCMSState, false, \ 1706 "Trace the state of the CMS collection") \ 1707 \ 1708 product(intx, RefDiscoveryPolicy, 0, \ 1709 "Whether reference-based(0) or referent-based(1)") \ 1710 \ 1711 product(bool, ParallelRefProcEnabled, false, \ 1712 "Enable parallel reference processing whenever possible") \ 1713 \ 1714 product(bool, ParallelRefProcBalancingEnabled, true, \ 1715 "Enable balancing of reference processing queues") \ 1716 \ 1717 product(intx, CMSTriggerRatio, 80, \ 1718 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1719 "allocated before a CMS collection cycle commences") \ 1720 \ 1721 product(intx, CMSTriggerPermRatio, 80, \ 1722 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1723 "is allocated before a CMS collection cycle commences, that " \ 1724 "also collects the perm generation") \ 1725 \ 1726 product(uintx, CMSBootstrapOccupancy, 50, \ 1727 "Percentage CMS generation occupancy at which to " \ 1728 "initiate CMS collection for bootstrapping collection stats") \ 1729 \ 1730 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1731 "Percentage CMS generation occupancy to start a CMS collection " \ 1732 "cycle. A negative value means that CMSTriggerRatio is used") \ 1733 \ 1734 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1735 "Percentage of the (entire) heap occupancy to start a " \ 1736 "concurrent GC cycle. It us used by GCs that trigger a " \ 1737 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1738 "not just one of the generations (e.g., G1). A value of 0 " \ 1739 "denotes 'do constant GC cycles'.") \ 1740 \ 1741 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1742 "Percentage CMS perm generation occupancy to start a " \ 1743 "CMScollection cycle. A negative value means that " \ 1744 "CMSTriggerPermRatio is used") \ 1745 \ 1746 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1747 "Only use occupancy as a crierion for starting a CMS collection") \ 1748 \ 1749 product(intx, CMSIsTooFullPercentage, 98, \ 1750 "An absolute ceiling above which CMS will always consider the " \ 1751 "perm gen ripe for collection") \ 1752 \ 1753 develop(bool, CMSTestInFreeList, false, \ 1754 "Check if the coalesced range is already in the " \ 1755 "free lists as claimed") \ 1756 \ 1757 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1758 "Check that all the garbage collected was returned to the " \ 1759 "free lists.") \ 1760 \ 1761 notproduct(bool, ScavengeALot, false, \ 1762 "Force scavenge at every Nth exit from the runtime system " \ 1763 "(N=ScavengeALotInterval)") \ 1764 \ 1765 develop(bool, FullGCALot, false, \ 1766 "Force full gc at every Nth exit from the runtime system " \ 1767 "(N=FullGCALotInterval)") \ 1768 \ 1769 notproduct(bool, GCALotAtAllSafepoints, false, \ 1770 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1771 \ 1772 product(bool, HandlePromotionFailure, true, \ 1773 "The youngest generation collection does not require " \ 1774 "a guarantee of full promotion of all live objects.") \ 1775 \ 1776 product(bool, PrintPromotionFailure, false, \ 1777 "Print additional diagnostic information following " \ 1778 " promotion failure") \ 1779 \ 1780 notproduct(bool, PromotionFailureALot, false, \ 1781 "Use promotion failure handling on every youngest generation " \ 1782 "collection") \ 1783 \ 1784 develop(uintx, PromotionFailureALotCount, 1000, \ 1785 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1786 "refill attempts (ParNew) or promotion attempts " \ 1787 "(other young collectors) ") \ 1788 \ 1789 develop(uintx, PromotionFailureALotInterval, 5, \ 1790 "Total collections between promotion failures alot") \ 1791 \ 1792 develop(intx, WorkStealingSleepMillis, 1, \ 1793 "Sleep time when sleep is used for yields") \ 1794 \ 1795 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1796 "Number of yields before a sleep is done during workstealing") \ 1797 \ 1798 develop(uintx, WorkStealingHardSpins, 4096, \ 1799 "Number of iterations in a spin loop between checks on " \ 1800 "time out of hard spin") \ 1801 \ 1802 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1803 "Ratio of hard spins to calls to yield") \ 1804 \ 1805 product(uintx, PreserveMarkStackSize, 1024, \ 1806 "Size for stack used in promotion failure handling") \ 1807 \ 1808 develop(uintx, ObjArrayMarkingStride, 512, \ 1809 "Number of ObjArray elements to push onto the marking stack" \ 1810 "before pushing a continuation entry") \ 1811 \ 1812 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1813 \ 1814 product_pd(bool, ResizeTLAB, \ 1815 "Dynamically resize tlab size for threads") \ 1816 \ 1817 product(bool, ZeroTLAB, false, \ 1818 "Zero out the newly created TLAB") \ 1819 \ 1820 product(bool, FastTLABRefill, true, \ 1821 "Use fast TLAB refill code") \ 1822 \ 1823 product(bool, PrintTLAB, false, \ 1824 "Print various TLAB related information") \ 1825 \ 1826 product(bool, TLABStats, true, \ 1827 "Print various TLAB related information") \ 1828 \ 1829 product(bool, PrintRevisitStats, false, \ 1830 "Print revisit (klass and MDO) stack related information") \ 1831 \ 1832 product_pd(bool, NeverActAsServerClassMachine, \ 1833 "Never act like a server-class machine") \ 1834 \ 1835 product(bool, AlwaysActAsServerClassMachine, false, \ 1836 "Always act like a server-class machine") \ 1837 \ 1838 product_pd(uint64_t, MaxRAM, \ 1839 "Real memory size (in bytes) used to set maximum heap size") \ 1840 \ 1841 product(uintx, ErgoHeapSizeLimit, 0, \ 1842 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1843 "MaxRAM / MaxRAMFraction") \ 1844 \ 1845 product(uintx, MaxRAMFraction, 4, \ 1846 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1847 "size") \ 1848 \ 1849 product(uintx, DefaultMaxRAMFraction, 4, \ 1850 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1851 "size; deprecated: to be renamed to MaxRAMFraction") \ 1852 \ 1853 product(uintx, MinRAMFraction, 2, \ 1854 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1855 "size on systems with small physical memory size") \ 1856 \ 1857 product(uintx, InitialRAMFraction, 64, \ 1858 "Fraction (1/n) of real memory used for initial heap size") \ 1859 \ 1860 product(bool, UseAutoGCSelectPolicy, false, \ 1861 "Use automatic collection selection policy") \ 1862 \ 1863 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1864 "Automatic GC selection pause threshhold in ms") \ 1865 \ 1866 product(bool, UseAdaptiveSizePolicy, true, \ 1867 "Use adaptive generation sizing policies") \ 1868 \ 1869 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1870 "Use adaptive survivor sizing policies") \ 1871 \ 1872 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1873 "Use adaptive young-old sizing policies at minor collections") \ 1874 \ 1875 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1876 "Use adaptive young-old sizing policies at major collections") \ 1877 \ 1878 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1879 "Use statistics from System.GC for adaptive size policy") \ 1880 \ 1881 product(bool, UseAdaptiveGCBoundary, false, \ 1882 "Allow young-old boundary to move") \ 1883 \ 1884 develop(bool, TraceAdaptiveGCBoundary, false, \ 1885 "Trace young-old boundary moves") \ 1886 \ 1887 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1888 "Resize the virtual spaces of the young or old generations") \ 1889 \ 1890 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1891 "Policy for changeing generation size for throughput goals") \ 1892 \ 1893 product(uintx, AdaptiveSizePausePolicy, 0, \ 1894 "Policy for changing generation size for pause goals") \ 1895 \ 1896 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1897 "Adjust tenured generation to achive a minor pause goal") \ 1898 \ 1899 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1900 "Adjust young generation to achive a major pause goal") \ 1901 \ 1902 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1903 "Number of steps where heuristics is used before data is used") \ 1904 \ 1905 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1906 "Number of collections before the adaptive sizing is started") \ 1907 \ 1908 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1909 "Collecton interval for printing information; zero => never") \ 1910 \ 1911 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1912 "Use adaptive minimum footprint as a goal") \ 1913 \ 1914 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1915 "Weight given to exponential resizing, between 0 and 100") \ 1916 \ 1917 product(uintx, AdaptiveTimeWeight, 25, \ 1918 "Weight given to time in adaptive policy, between 0 and 100") \ 1919 \ 1920 product(uintx, PausePadding, 1, \ 1921 "How much buffer to keep for pause time") \ 1922 \ 1923 product(uintx, PromotedPadding, 3, \ 1924 "How much buffer to keep for promotion failure") \ 1925 \ 1926 product(uintx, SurvivorPadding, 3, \ 1927 "How much buffer to keep for survivor overflow") \ 1928 \ 1929 product(uintx, AdaptivePermSizeWeight, 20, \ 1930 "Weight for perm gen exponential resizing, between 0 and 100") \ 1931 \ 1932 product(uintx, PermGenPadding, 3, \ 1933 "How much buffer to keep for perm gen sizing") \ 1934 \ 1935 product(uintx, ThresholdTolerance, 10, \ 1936 "Allowed collection cost difference between generations") \ 1937 \ 1938 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1939 "If collection costs are within margin, reduce both by full " \ 1940 "delta") \ 1941 \ 1942 product(uintx, YoungGenerationSizeIncrement, 20, \ 1943 "Adaptive size percentage change in young generation") \ 1944 \ 1945 product(uintx, YoungGenerationSizeSupplement, 80, \ 1946 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1947 \ 1948 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1949 "Decay factor to YoungedGenerationSizeSupplement") \ 1950 \ 1951 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1952 "Adaptive size percentage change in tenured generation") \ 1953 \ 1954 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1955 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1956 \ 1957 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1958 "Decay factor to TenuredGenerationSizeIncrement") \ 1959 \ 1960 product(uintx, MaxGCPauseMillis, max_uintx, \ 1961 "Adaptive size policy maximum GC pause time goal in msec, " \ 1962 "or (G1 Only) the max. GC time per MMU time slice") \ 1963 \ 1964 product(intx, GCPauseIntervalMillis, 500, \ 1965 "Time slice for MMU specification") \ 1966 \ 1967 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1968 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1969 \ 1970 product(uintx, GCTimeRatio, 99, \ 1971 "Adaptive size policy application time to GC time ratio") \ 1972 \ 1973 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1974 "Adaptive size scale down factor for shrinking") \ 1975 \ 1976 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1977 "Adaptive size decays the major cost for long major intervals") \ 1978 \ 1979 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1980 "Time scale over which major costs decay") \ 1981 \ 1982 product(uintx, MinSurvivorRatio, 3, \ 1983 "Minimum ratio of young generation/survivor space size") \ 1984 \ 1985 product(uintx, InitialSurvivorRatio, 8, \ 1986 "Initial ratio of eden/survivor space size") \ 1987 \ 1988 product(uintx, BaseFootPrintEstimate, 256*M, \ 1989 "Estimate of footprint other than Java Heap") \ 1990 \ 1991 product(bool, UseGCOverheadLimit, true, \ 1992 "Use policy to limit of proportion of time spent in GC " \ 1993 "before an OutOfMemory error is thrown") \ 1994 \ 1995 product(uintx, GCTimeLimit, 98, \ 1996 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1997 "error is thrown (used with GCHeapFreeLimit)") \ 1998 \ 1999 product(uintx, GCHeapFreeLimit, 2, \ 2000 "Minimum percentage of free space after a full GC before an " \ 2001 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2002 \ 2003 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2004 "Number of consecutive collections before gc time limit fires") \ 2005 \ 2006 product(bool, PrintAdaptiveSizePolicy, false, \ 2007 "Print information about AdaptiveSizePolicy") \ 2008 \ 2009 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2010 "How far ahead to prefetch destination area (<= 0 means off)") \ 2011 \ 2012 product(intx, PrefetchScanIntervalInBytes, -1, \ 2013 "How far ahead to prefetch scan area (<= 0 means off)") \ 2014 \ 2015 product(intx, PrefetchFieldsAhead, -1, \ 2016 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2017 \ 2018 develop(bool, UsePrefetchQueue, true, \ 2019 "Use the prefetch queue during PS promotion") \ 2020 \ 2021 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2022 "Verify system before exiting") \ 2023 \ 2024 diagnostic(bool, VerifyBeforeGC, false, \ 2025 "Verify memory system before GC") \ 2026 \ 2027 diagnostic(bool, VerifyAfterGC, false, \ 2028 "Verify memory system after GC") \ 2029 \ 2030 diagnostic(bool, VerifyDuringGC, false, \ 2031 "Verify memory system during GC (between phases)") \ 2032 \ 2033 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2034 "Enable parallel memory system verification") \ 2035 \ 2036 diagnostic(bool, DeferInitialCardMark, false, \ 2037 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2038 "may arise from new_pre_store_barrier") \ 2039 \ 2040 diagnostic(bool, VerifyRememberedSets, false, \ 2041 "Verify GC remembered sets") \ 2042 \ 2043 diagnostic(bool, VerifyObjectStartArray, true, \ 2044 "Verify GC object start array if verify before/after") \ 2045 \ 2046 product(bool, DisableExplicitGC, false, \ 2047 "Tells whether calling System.gc() does a full GC") \ 2048 \ 2049 notproduct(bool, CheckMemoryInitialization, false, \ 2050 "Checks memory initialization") \ 2051 \ 2052 product(bool, CollectGen0First, false, \ 2053 "Collect youngest generation before each full GC") \ 2054 \ 2055 diagnostic(bool, BindCMSThreadToCPU, false, \ 2056 "Bind CMS Thread to CPU if possible") \ 2057 \ 2058 diagnostic(uintx, CPUForCMSThread, 0, \ 2059 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2060 \ 2061 product(bool, BindGCTaskThreadsToCPUs, false, \ 2062 "Bind GCTaskThreads to CPUs if possible") \ 2063 \ 2064 product(bool, UseGCTaskAffinity, false, \ 2065 "Use worker affinity when asking for GCTasks") \ 2066 \ 2067 product(uintx, ProcessDistributionStride, 4, \ 2068 "Stride through processors when distributing processes") \ 2069 \ 2070 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2071 "number of times the coordinator GC thread will sleep while " \ 2072 "yielding before giving up and resuming GC") \ 2073 \ 2074 product(uintx, CMSYieldSleepCount, 0, \ 2075 "number of times a GC thread (minus the coordinator) " \ 2076 "will sleep while yielding before giving up and resuming GC") \ 2077 \ 2078 /* gc tracing */ \ 2079 manageable(bool, PrintGC, false, \ 2080 "Print message at garbage collect") \ 2081 \ 2082 manageable(bool, PrintGCDetails, false, \ 2083 "Print more details at garbage collect") \ 2084 \ 2085 manageable(bool, PrintGCDateStamps, false, \ 2086 "Print date stamps at garbage collect") \ 2087 \ 2088 manageable(bool, PrintGCTimeStamps, false, \ 2089 "Print timestamps at garbage collect") \ 2090 \ 2091 product(bool, PrintGCTaskTimeStamps, false, \ 2092 "Print timestamps for individual gc worker thread tasks") \ 2093 \ 2094 develop(intx, ConcGCYieldTimeout, 0, \ 2095 "If non-zero, assert that GC threads yield within this # of ms.") \ 2096 \ 2097 notproduct(bool, TraceMarkSweep, false, \ 2098 "Trace mark sweep") \ 2099 \ 2100 product(bool, PrintReferenceGC, false, \ 2101 "Print times spent handling reference objects during GC " \ 2102 " (enabled only when PrintGCDetails)") \ 2103 \ 2104 develop(bool, TraceReferenceGC, false, \ 2105 "Trace handling of soft/weak/final/phantom references") \ 2106 \ 2107 develop(bool, TraceFinalizerRegistration, false, \ 2108 "Trace registration of final references") \ 2109 \ 2110 notproduct(bool, TraceScavenge, false, \ 2111 "Trace scavenge") \ 2112 \ 2113 product_rw(bool, TraceClassLoading, false, \ 2114 "Trace all classes loaded") \ 2115 \ 2116 product(bool, TraceClassLoadingPreorder, false, \ 2117 "Trace all classes loaded in order referenced (not loaded)") \ 2118 \ 2119 product_rw(bool, TraceClassUnloading, false, \ 2120 "Trace unloading of classes") \ 2121 \ 2122 product_rw(bool, TraceLoaderConstraints, false, \ 2123 "Trace loader constraints") \ 2124 \ 2125 product(bool, TraceGen0Time, false, \ 2126 "Trace accumulated time for Gen 0 collection") \ 2127 \ 2128 product(bool, TraceGen1Time, false, \ 2129 "Trace accumulated time for Gen 1 collection") \ 2130 \ 2131 product(bool, PrintTenuringDistribution, false, \ 2132 "Print tenuring age information") \ 2133 \ 2134 product_rw(bool, PrintHeapAtGC, false, \ 2135 "Print heap layout before and after each GC") \ 2136 \ 2137 product_rw(bool, PrintHeapAtGCExtended, false, \ 2138 "Prints extended information about the layout of the heap " \ 2139 "when -XX:+PrintHeapAtGC is set") \ 2140 \ 2141 product(bool, PrintHeapAtSIGBREAK, true, \ 2142 "Print heap layout in response to SIGBREAK") \ 2143 \ 2144 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2145 "Print a class histogram before any major stop-world GC") \ 2146 \ 2147 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2148 "Print a class histogram after any major stop-world GC") \ 2149 \ 2150 manageable(bool, PrintClassHistogram, false, \ 2151 "Print a histogram of class instances") \ 2152 \ 2153 develop(bool, TraceWorkGang, false, \ 2154 "Trace activities of work gangs") \ 2155 \ 2156 product(bool, TraceParallelOldGCTasks, false, \ 2157 "Trace multithreaded GC activity") \ 2158 \ 2159 develop(bool, TraceBlockOffsetTable, false, \ 2160 "Print BlockOffsetTable maps") \ 2161 \ 2162 develop(bool, TraceCardTableModRefBS, false, \ 2163 "Print CardTableModRefBS maps") \ 2164 \ 2165 develop(bool, TraceGCTaskManager, false, \ 2166 "Trace actions of the GC task manager") \ 2167 \ 2168 develop(bool, TraceGCTaskQueue, false, \ 2169 "Trace actions of the GC task queues") \ 2170 \ 2171 develop(bool, TraceGCTaskThread, false, \ 2172 "Trace actions of the GC task threads") \ 2173 \ 2174 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2175 "Print the time taken by each parallel old gc phase." \ 2176 "PrintGCDetails must also be enabled.") \ 2177 \ 2178 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2179 "Trace parallel old gc marking phase") \ 2180 \ 2181 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2182 "Trace parallel old gc summary phase") \ 2183 \ 2184 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2185 "Trace parallel old gc compaction phase") \ 2186 \ 2187 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2188 "Trace parallel old gc dense prefix computation") \ 2189 \ 2190 develop(bool, IgnoreLibthreadGPFault, false, \ 2191 "Suppress workaround for libthread GP fault") \ 2192 \ 2193 product(bool, PrintJNIGCStalls, false, \ 2194 "Print diagnostic message when GC is stalled" \ 2195 "by JNI critical section") \ 2196 \ 2197 /* JVMTI heap profiling */ \ 2198 \ 2199 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2200 "Trace JVMTI object tagging calls") \ 2201 \ 2202 diagnostic(bool, VerifyBeforeIteration, false, \ 2203 "Verify memory system before JVMTI iteration") \ 2204 \ 2205 /* compiler interface */ \ 2206 \ 2207 develop(bool, CIPrintCompilerName, false, \ 2208 "when CIPrint is active, print the name of the active compiler") \ 2209 \ 2210 develop(bool, CIPrintCompileQueue, false, \ 2211 "display the contents of the compile queue whenever a " \ 2212 "compilation is enqueued") \ 2213 \ 2214 develop(bool, CIPrintRequests, false, \ 2215 "display every request for compilation") \ 2216 \ 2217 product(bool, CITime, false, \ 2218 "collect timing information for compilation") \ 2219 \ 2220 develop(bool, CITimeEach, false, \ 2221 "display timing information after each successful compilation") \ 2222 \ 2223 develop(bool, CICountOSR, true, \ 2224 "use a separate counter when assigning ids to osr compilations") \ 2225 \ 2226 develop(bool, CICompileNatives, true, \ 2227 "compile native methods if supported by the compiler") \ 2228 \ 2229 develop_pd(bool, CICompileOSR, \ 2230 "compile on stack replacement methods if supported by the " \ 2231 "compiler") \ 2232 \ 2233 develop(bool, CIPrintMethodCodes, false, \ 2234 "print method bytecodes of the compiled code") \ 2235 \ 2236 develop(bool, CIPrintTypeFlow, false, \ 2237 "print the results of ciTypeFlow analysis") \ 2238 \ 2239 develop(bool, CITraceTypeFlow, false, \ 2240 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2241 \ 2242 develop(intx, CICloneLoopTestLimit, 100, \ 2243 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2244 \ 2245 /* temp diagnostics */ \ 2246 \ 2247 diagnostic(bool, TraceRedundantCompiles, false, \ 2248 "Have compile broker print when a request already in the queue is"\ 2249 " requested again") \ 2250 \ 2251 diagnostic(bool, InitialCompileFast, false, \ 2252 "Initial compile at CompLevel_fast_compile") \ 2253 \ 2254 diagnostic(bool, InitialCompileReallyFast, false, \ 2255 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2256 \ 2257 diagnostic(bool, FullProfileOnReInterpret, true, \ 2258 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2259 \ 2260 /* compiler */ \ 2261 \ 2262 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2263 "Number of compiler threads to run") \ 2264 \ 2265 product(intx, CompilationPolicyChoice, 0, \ 2266 "which compilation policy (0/1)") \ 2267 \ 2268 develop(bool, UseStackBanging, true, \ 2269 "use stack banging for stack overflow checks (required for " \ 2270 "proper StackOverflow handling; disable only to measure cost " \ 2271 "of stackbanging)") \ 2272 \ 2273 develop(bool, Use24BitFPMode, true, \ 2274 "Set 24-bit FPU mode on a per-compile basis ") \ 2275 \ 2276 develop(bool, Use24BitFP, true, \ 2277 "use FP instructions that produce 24-bit precise results") \ 2278 \ 2279 develop(bool, UseStrictFP, true, \ 2280 "use strict fp if modifier strictfp is set") \ 2281 \ 2282 develop(bool, GenerateSynchronizationCode, true, \ 2283 "generate locking/unlocking code for synchronized methods and " \ 2284 "monitors") \ 2285 \ 2286 develop(bool, GenerateCompilerNullChecks, true, \ 2287 "Generate explicit null checks for loads/stores/calls") \ 2288 \ 2289 develop(bool, GenerateRangeChecks, true, \ 2290 "Generate range checks for array accesses") \ 2291 \ 2292 develop_pd(bool, ImplicitNullChecks, \ 2293 "generate code for implicit null checks") \ 2294 \ 2295 product(bool, PrintSafepointStatistics, false, \ 2296 "print statistics about safepoint synchronization") \ 2297 \ 2298 product(intx, PrintSafepointStatisticsCount, 300, \ 2299 "total number of safepoint statistics collected " \ 2300 "before printing them out") \ 2301 \ 2302 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2303 "print safepoint statistics only when safepoint takes" \ 2304 " more than PrintSafepointSatisticsTimeout in millis") \ 2305 \ 2306 product(bool, TraceSafepointCleanupTime, false, \ 2307 "print the break down of clean up tasks performed during" \ 2308 " safepoint") \ 2309 \ 2310 develop(bool, InlineAccessors, true, \ 2311 "inline accessor methods (get/set)") \ 2312 \ 2313 product(bool, Inline, true, \ 2314 "enable inlining") \ 2315 \ 2316 product(bool, ClipInlining, true, \ 2317 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2318 \ 2319 develop(bool, UseCHA, true, \ 2320 "enable CHA") \ 2321 \ 2322 product(bool, UseTypeProfile, true, \ 2323 "Check interpreter profile for historically monomorphic calls") \ 2324 \ 2325 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2326 "% of major receiver type to all profiled receivers") \ 2327 \ 2328 notproduct(bool, TimeCompiler, false, \ 2329 "time the compiler") \ 2330 \ 2331 notproduct(bool, TimeCompiler2, false, \ 2332 "detailed time the compiler (requires +TimeCompiler)") \ 2333 \ 2334 diagnostic(bool, PrintInlining, false, \ 2335 "prints inlining optimizations") \ 2336 \ 2337 diagnostic(bool, PrintIntrinsics, false, \ 2338 "prints attempted and successful inlining of intrinsics") \ 2339 \ 2340 product(bool, UseCountLeadingZerosInstruction, false, \ 2341 "Use count leading zeros instruction") \ 2342 \ 2343 product(bool, UsePopCountInstruction, false, \ 2344 "Use population count instruction") \ 2345 \ 2346 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2347 "do not expand intrinsics whose (internal) names appear here") \ 2348 \ 2349 develop(bool, StressReflectiveCode, false, \ 2350 "Use inexact types at allocations, etc., to test reflection") \ 2351 \ 2352 develop(bool, EagerInitialization, false, \ 2353 "Eagerly initialize classes if possible") \ 2354 \ 2355 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2356 "Update methodDataOops in Tier1-generated code") \ 2357 \ 2358 develop(bool, TraceMethodReplacement, false, \ 2359 "Print when methods are replaced do to recompilation") \ 2360 \ 2361 develop(bool, PrintMethodFlushing, false, \ 2362 "print the nmethods being flushed") \ 2363 \ 2364 notproduct(bool, LogMultipleMutexLocking, false, \ 2365 "log locking and unlocking of mutexes (only if multiple locks " \ 2366 "are held)") \ 2367 \ 2368 develop(bool, UseRelocIndex, false, \ 2369 "use an index to speed random access to relocations") \ 2370 \ 2371 develop(bool, StressCodeBuffers, false, \ 2372 "Exercise code buffer expansion and other rare state changes") \ 2373 \ 2374 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2375 "Generate extra debugging info for non-safepoints in nmethods") \ 2376 \ 2377 diagnostic(bool, DebugInlinedCalls, true, \ 2378 "If false, restricts profiled locations to the root method only") \ 2379 \ 2380 product(bool, PrintVMOptions, trueInDebug, \ 2381 "Print flags that appeared on the command line") \ 2382 \ 2383 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2384 "Ignore unrecognized VM options") \ 2385 \ 2386 product(bool, PrintCommandLineFlags, false, \ 2387 "Print flags specified on command line or set by ergonomics") \ 2388 \ 2389 product(bool, PrintFlagsInitial, false, \ 2390 "Print all VM flags before argument processing and exit VM") \ 2391 \ 2392 product(bool, PrintFlagsFinal, false, \ 2393 "Print all VM flags after argument and ergonomic processing") \ 2394 \ 2395 diagnostic(bool, SerializeVMOutput, true, \ 2396 "Use a mutex to serialize output to tty and hotspot.log") \ 2397 \ 2398 diagnostic(bool, DisplayVMOutput, true, \ 2399 "Display all VM output on the tty, independently of LogVMOutput") \ 2400 \ 2401 diagnostic(bool, LogVMOutput, trueInDebug, \ 2402 "Save VM output to hotspot.log, or to LogFile") \ 2403 \ 2404 diagnostic(ccstr, LogFile, NULL, \ 2405 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2406 \ 2407 product(ccstr, ErrorFile, NULL, \ 2408 "If an error occurs, save the error data to this file " \ 2409 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2410 \ 2411 product(bool, DisplayVMOutputToStderr, false, \ 2412 "If DisplayVMOutput is true, display all VM output to stderr") \ 2413 \ 2414 product(bool, DisplayVMOutputToStdout, false, \ 2415 "If DisplayVMOutput is true, display all VM output to stdout") \ 2416 \ 2417 product(bool, UseHeavyMonitors, false, \ 2418 "use heavyweight instead of lightweight Java monitors") \ 2419 \ 2420 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2421 "print histogram of the symbol table") \ 2422 \ 2423 notproduct(bool, ExitVMOnVerifyError, false, \ 2424 "standard exit from VM if bytecode verify error " \ 2425 "(only in debug mode)") \ 2426 \ 2427 notproduct(ccstr, AbortVMOnException, NULL, \ 2428 "Call fatal if this exception is thrown. Example: " \ 2429 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2430 \ 2431 develop(bool, DebugVtables, false, \ 2432 "add debugging code to vtable dispatch") \ 2433 \ 2434 develop(bool, PrintVtables, false, \ 2435 "print vtables when printing klass") \ 2436 \ 2437 notproduct(bool, PrintVtableStats, false, \ 2438 "print vtables stats at end of run") \ 2439 \ 2440 develop(bool, TraceCreateZombies, false, \ 2441 "trace creation of zombie nmethods") \ 2442 \ 2443 notproduct(bool, IgnoreLockingAssertions, false, \ 2444 "disable locking assertions (for speed)") \ 2445 \ 2446 notproduct(bool, VerifyLoopOptimizations, false, \ 2447 "verify major loop optimizations") \ 2448 \ 2449 product(bool, RangeCheckElimination, true, \ 2450 "Split loop iterations to eliminate range checks") \ 2451 \ 2452 develop_pd(bool, UncommonNullCast, \ 2453 "track occurrences of null in casts; adjust compiler tactics") \ 2454 \ 2455 develop(bool, TypeProfileCasts, true, \ 2456 "treat casts like calls for purposes of type profiling") \ 2457 \ 2458 develop(bool, MonomorphicArrayCheck, true, \ 2459 "Uncommon-trap array store checks that require full type check") \ 2460 \ 2461 develop(bool, DelayCompilationDuringStartup, true, \ 2462 "Delay invoking the compiler until main application class is " \ 2463 "loaded") \ 2464 \ 2465 develop(bool, CompileTheWorld, false, \ 2466 "Compile all methods in all classes in bootstrap class path " \ 2467 "(stress test)") \ 2468 \ 2469 develop(bool, CompileTheWorldPreloadClasses, true, \ 2470 "Preload all classes used by a class before start loading") \ 2471 \ 2472 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2473 "Compile all methods although class initializer failed") \ 2474 \ 2475 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2476 "Force a safepoint every n compiles so sweeper can keep up") \ 2477 \ 2478 develop(bool, TraceIterativeGVN, false, \ 2479 "Print progress during Iterative Global Value Numbering") \ 2480 \ 2481 develop(bool, FillDelaySlots, true, \ 2482 "Fill delay slots (on SPARC only)") \ 2483 \ 2484 develop(bool, VerifyIterativeGVN, false, \ 2485 "Verify Def-Use modifications during sparse Iterative Global " \ 2486 "Value Numbering") \ 2487 \ 2488 notproduct(bool, TracePhaseCCP, false, \ 2489 "Print progress during Conditional Constant Propagation") \ 2490 \ 2491 develop(bool, TimeLivenessAnalysis, false, \ 2492 "Time computation of bytecode liveness analysis") \ 2493 \ 2494 develop(bool, TraceLivenessGen, false, \ 2495 "Trace the generation of liveness analysis information") \ 2496 \ 2497 notproduct(bool, TraceLivenessQuery, false, \ 2498 "Trace queries of liveness analysis information") \ 2499 \ 2500 notproduct(bool, CollectIndexSetStatistics, false, \ 2501 "Collect information about IndexSets") \ 2502 \ 2503 develop(bool, PrintDominators, false, \ 2504 "Print out dominator trees for GVN") \ 2505 \ 2506 develop(bool, UseLoopSafepoints, true, \ 2507 "Generate Safepoint nodes in every loop") \ 2508 \ 2509 notproduct(bool, TraceCISCSpill, false, \ 2510 "Trace allocators use of cisc spillable instructions") \ 2511 \ 2512 notproduct(bool, TraceSpilling, false, \ 2513 "Trace spilling") \ 2514 \ 2515 product(bool, SplitIfBlocks, true, \ 2516 "Clone compares and control flow through merge points to fold " \ 2517 "some branches") \ 2518 \ 2519 develop(intx, FastAllocateSizeLimit, 128*K, \ 2520 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2521 "Inline allocations larger than this in doublewords must go slow")\ 2522 \ 2523 product(bool, AggressiveOpts, false, \ 2524 "Enable aggressive optimizations - see arguments.cpp") \ 2525 \ 2526 product(bool, UseStringCache, false, \ 2527 "Enable String cache capabilities on String.java") \ 2528 \ 2529 /* statistics */ \ 2530 develop(bool, UseVTune, false, \ 2531 "enable support for Intel's VTune profiler") \ 2532 \ 2533 develop(bool, CountCompiledCalls, false, \ 2534 "counts method invocations") \ 2535 \ 2536 notproduct(bool, CountRuntimeCalls, false, \ 2537 "counts VM runtime calls") \ 2538 \ 2539 develop(bool, CountJNICalls, false, \ 2540 "counts jni method invocations") \ 2541 \ 2542 notproduct(bool, CountJVMCalls, false, \ 2543 "counts jvm method invocations") \ 2544 \ 2545 notproduct(bool, CountRemovableExceptions, false, \ 2546 "count exceptions that could be replaced by branches due to " \ 2547 "inlining") \ 2548 \ 2549 notproduct(bool, ICMissHistogram, false, \ 2550 "produce histogram of IC misses") \ 2551 \ 2552 notproduct(bool, PrintClassStatistics, false, \ 2553 "prints class statistics at end of run") \ 2554 \ 2555 notproduct(bool, PrintMethodStatistics, false, \ 2556 "prints method statistics at end of run") \ 2557 \ 2558 /* interpreter */ \ 2559 develop(bool, ClearInterpreterLocals, false, \ 2560 "Always clear local variables of interpreter activations upon " \ 2561 "entry") \ 2562 \ 2563 product_pd(bool, RewriteBytecodes, \ 2564 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2565 \ 2566 product_pd(bool, RewriteFrequentPairs, \ 2567 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2568 \ 2569 diagnostic(bool, PrintInterpreter, false, \ 2570 "Prints the generated interpreter code") \ 2571 \ 2572 product(bool, UseInterpreter, true, \ 2573 "Use interpreter for non-compiled methods") \ 2574 \ 2575 develop(bool, UseFastSignatureHandlers, true, \ 2576 "Use fast signature handlers for native calls") \ 2577 \ 2578 develop(bool, UseV8InstrsOnly, false, \ 2579 "Use SPARC-V8 Compliant instruction subset") \ 2580 \ 2581 product(bool, UseNiagaraInstrs, false, \ 2582 "Use Niagara-efficient instruction subset") \ 2583 \ 2584 develop(bool, UseCASForSwap, false, \ 2585 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2586 \ 2587 product(bool, UseLoopCounter, true, \ 2588 "Increment invocation counter on backward branch") \ 2589 \ 2590 product(bool, UseFastEmptyMethods, true, \ 2591 "Use fast method entry code for empty methods") \ 2592 \ 2593 product(bool, UseFastAccessorMethods, true, \ 2594 "Use fast method entry code for accessor methods") \ 2595 \ 2596 product_pd(bool, UseOnStackReplacement, \ 2597 "Use on stack replacement, calls runtime if invoc. counter " \ 2598 "overflows in loop") \ 2599 \ 2600 notproduct(bool, TraceOnStackReplacement, false, \ 2601 "Trace on stack replacement") \ 2602 \ 2603 develop(bool, PoisonOSREntry, true, \ 2604 "Detect abnormal calls to OSR code") \ 2605 \ 2606 product_pd(bool, PreferInterpreterNativeStubs, \ 2607 "Use always interpreter stubs for native methods invoked via " \ 2608 "interpreter") \ 2609 \ 2610 develop(bool, CountBytecodes, false, \ 2611 "Count number of bytecodes executed") \ 2612 \ 2613 develop(bool, PrintBytecodeHistogram, false, \ 2614 "Print histogram of the executed bytecodes") \ 2615 \ 2616 develop(bool, PrintBytecodePairHistogram, false, \ 2617 "Print histogram of the executed bytecode pairs") \ 2618 \ 2619 diagnostic(bool, PrintSignatureHandlers, false, \ 2620 "Print code generated for native method signature handlers") \ 2621 \ 2622 develop(bool, VerifyOops, false, \ 2623 "Do plausibility checks for oops") \ 2624 \ 2625 develop(bool, CheckUnhandledOops, false, \ 2626 "Check for unhandled oops in VM code") \ 2627 \ 2628 develop(bool, VerifyJNIFields, trueInDebug, \ 2629 "Verify jfieldIDs for instance fields") \ 2630 \ 2631 notproduct(bool, VerifyJNIEnvThread, false, \ 2632 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2633 "from JNI") \ 2634 \ 2635 develop(bool, VerifyFPU, false, \ 2636 "Verify FPU state (check for NaN's, etc.)") \ 2637 \ 2638 develop(bool, VerifyThread, false, \ 2639 "Watch the thread register for corruption (SPARC only)") \ 2640 \ 2641 develop(bool, VerifyActivationFrameSize, false, \ 2642 "Verify that activation frame didn't become smaller than its " \ 2643 "minimal size") \ 2644 \ 2645 develop(bool, TraceFrequencyInlining, false, \ 2646 "Trace frequency based inlining") \ 2647 \ 2648 notproduct(bool, TraceTypeProfile, false, \ 2649 "Trace type profile") \ 2650 \ 2651 develop_pd(bool, InlineIntrinsics, \ 2652 "Inline intrinsics that can be statically resolved") \ 2653 \ 2654 product_pd(bool, ProfileInterpreter, \ 2655 "Profile at the bytecode level during interpretation") \ 2656 \ 2657 develop_pd(bool, ProfileTraps, \ 2658 "Profile deoptimization traps at the bytecode level") \ 2659 \ 2660 product(intx, ProfileMaturityPercentage, 20, \ 2661 "number of method invocations/branches (expressed as % of " \ 2662 "CompileThreshold) before using the method's profile") \ 2663 \ 2664 develop(bool, PrintMethodData, false, \ 2665 "Print the results of +ProfileInterpreter at end of run") \ 2666 \ 2667 develop(bool, VerifyDataPointer, trueInDebug, \ 2668 "Verify the method data pointer during interpreter profiling") \ 2669 \ 2670 develop(bool, VerifyCompiledCode, false, \ 2671 "Include miscellaneous runtime verifications in nmethod code; " \ 2672 "default off because it disturbs nmethod size heuristics") \ 2673 \ 2674 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2675 "Manually make GC thread crash then dump java stack trace; " \ 2676 "Test only") \ 2677 \ 2678 /* compilation */ \ 2679 product(bool, UseCompiler, true, \ 2680 "use compilation") \ 2681 \ 2682 develop(bool, TraceCompilationPolicy, false, \ 2683 "Trace compilation policy") \ 2684 \ 2685 develop(bool, TimeCompilationPolicy, false, \ 2686 "Time the compilation policy") \ 2687 \ 2688 product(bool, UseCounterDecay, true, \ 2689 "adjust recompilation counters") \ 2690 \ 2691 develop(intx, CounterHalfLifeTime, 30, \ 2692 "half-life time of invocation counters (in secs)") \ 2693 \ 2694 develop(intx, CounterDecayMinIntervalLength, 500, \ 2695 "Min. ms. between invocation of CounterDecay") \ 2696 \ 2697 product(bool, AlwaysCompileLoopMethods, false, \ 2698 "when using recompilation, never interpret methods " \ 2699 "containing loops") \ 2700 \ 2701 product(bool, DontCompileHugeMethods, true, \ 2702 "don't compile methods > HugeMethodLimit") \ 2703 \ 2704 /* Bytecode escape analysis estimation. */ \ 2705 product(bool, EstimateArgEscape, true, \ 2706 "Analyze bytecodes to estimate escape state of arguments") \ 2707 \ 2708 product(intx, BCEATraceLevel, 0, \ 2709 "How much tracing to do of bytecode escape analysis estimates") \ 2710 \ 2711 product(intx, MaxBCEAEstimateLevel, 5, \ 2712 "Maximum number of nested calls that are analyzed by BC EA.") \ 2713 \ 2714 product(intx, MaxBCEAEstimateSize, 150, \ 2715 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2716 \ 2717 product(intx, AllocatePrefetchStyle, 1, \ 2718 "0 = no prefetch, " \ 2719 "1 = prefetch instructions for each allocation, " \ 2720 "2 = use TLAB watermark to gate allocation prefetch, " \ 2721 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2722 \ 2723 product(intx, AllocatePrefetchDistance, -1, \ 2724 "Distance to prefetch ahead of allocation pointer") \ 2725 \ 2726 product(intx, AllocatePrefetchLines, 1, \ 2727 "Number of lines to prefetch ahead of allocation pointer") \ 2728 \ 2729 product(intx, AllocatePrefetchStepSize, 16, \ 2730 "Step size in bytes of sequential prefetch instructions") \ 2731 \ 2732 product(intx, AllocatePrefetchInstr, 0, \ 2733 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2734 \ 2735 product(intx, ReadPrefetchInstr, 0, \ 2736 "Prefetch instruction to prefetch ahead") \ 2737 \ 2738 /* deoptimization */ \ 2739 develop(bool, TraceDeoptimization, false, \ 2740 "Trace deoptimization") \ 2741 \ 2742 develop(bool, DebugDeoptimization, false, \ 2743 "Tracing various information while debugging deoptimization") \ 2744 \ 2745 product(intx, SelfDestructTimer, 0, \ 2746 "Will cause VM to terminate after a given time (in minutes) " \ 2747 "(0 means off)") \ 2748 \ 2749 product(intx, MaxJavaStackTraceDepth, 1024, \ 2750 "Max. no. of lines in the stack trace for Java exceptions " \ 2751 "(0 means all)") \ 2752 \ 2753 develop(intx, GuaranteedSafepointInterval, 1000, \ 2754 "Guarantee a safepoint (at least) every so many milliseconds " \ 2755 "(0 means none)") \ 2756 \ 2757 product(intx, SafepointTimeoutDelay, 10000, \ 2758 "Delay in milliseconds for option SafepointTimeout") \ 2759 \ 2760 product(intx, NmethodSweepFraction, 4, \ 2761 "Number of invocations of sweeper to cover all nmethods") \ 2762 \ 2763 notproduct(intx, MemProfilingInterval, 500, \ 2764 "Time between each invocation of the MemProfiler") \ 2765 \ 2766 develop(intx, MallocCatchPtr, -1, \ 2767 "Hit breakpoint when mallocing/freeing this pointer") \ 2768 \ 2769 notproduct(intx, AssertRepeat, 1, \ 2770 "number of times to evaluate expression in assert " \ 2771 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2772 \ 2773 notproduct(ccstrlist, SuppressErrorAt, "", \ 2774 "List of assertions (file:line) to muzzle") \ 2775 \ 2776 notproduct(uintx, HandleAllocationLimit, 1024, \ 2777 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2778 "is used") \ 2779 \ 2780 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2781 "Threshold for total handle allocation when " \ 2782 "+TraceHandleAllocation is used") \ 2783 \ 2784 develop(intx, StackPrintLimit, 100, \ 2785 "number of stack frames to print in VM-level stack dump") \ 2786 \ 2787 notproduct(intx, MaxElementPrintSize, 256, \ 2788 "maximum number of elements to print") \ 2789 \ 2790 notproduct(intx, MaxSubklassPrintSize, 4, \ 2791 "maximum number of subklasses to print when printing klass") \ 2792 \ 2793 product(intx, MaxInlineLevel, 9, \ 2794 "maximum number of nested calls that are inlined") \ 2795 \ 2796 product(intx, MaxRecursiveInlineLevel, 1, \ 2797 "maximum number of nested recursive calls that are inlined") \ 2798 \ 2799 product_pd(intx, InlineSmallCode, \ 2800 "Only inline already compiled methods if their code size is " \ 2801 "less than this") \ 2802 \ 2803 product(intx, MaxInlineSize, 35, \ 2804 "maximum bytecode size of a method to be inlined") \ 2805 \ 2806 product_pd(intx, FreqInlineSize, \ 2807 "maximum bytecode size of a frequent method to be inlined") \ 2808 \ 2809 product(intx, MaxTrivialSize, 6, \ 2810 "maximum bytecode size of a trivial method to be inlined") \ 2811 \ 2812 product(intx, MinInliningThreshold, 250, \ 2813 "min. invocation count a method needs to have to be inlined") \ 2814 \ 2815 develop(intx, AlignEntryCode, 4, \ 2816 "aligns entry code to specified value (in bytes)") \ 2817 \ 2818 develop(intx, MethodHistogramCutoff, 100, \ 2819 "cutoff value for method invoc. histogram (+CountCalls)") \ 2820 \ 2821 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2822 "# of interpreted methods to show in profile") \ 2823 \ 2824 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2825 "# of compiled methods to show in profile") \ 2826 \ 2827 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2828 "# of stub methods to show in profile") \ 2829 \ 2830 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2831 "# of runtime stub nodes to show in profile") \ 2832 \ 2833 product(intx, ProfileIntervalsTicks, 100, \ 2834 "# of ticks between printing of interval profile " \ 2835 "(+ProfileIntervals)") \ 2836 \ 2837 notproduct(intx, ScavengeALotInterval, 1, \ 2838 "Interval between which scavenge will occur with +ScavengeALot") \ 2839 \ 2840 notproduct(intx, FullGCALotInterval, 1, \ 2841 "Interval between which full gc will occur with +FullGCALot") \ 2842 \ 2843 notproduct(intx, FullGCALotStart, 0, \ 2844 "For which invocation to start FullGCAlot") \ 2845 \ 2846 notproduct(intx, FullGCALotDummies, 32*K, \ 2847 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2848 "to move") \ 2849 \ 2850 develop(intx, DontYieldALotInterval, 10, \ 2851 "Interval between which yields will be dropped (milliseconds)") \ 2852 \ 2853 develop(intx, MinSleepInterval, 1, \ 2854 "Minimum sleep() interval (milliseconds) when " \ 2855 "ConvertSleepToYield is off (used for SOLARIS)") \ 2856 \ 2857 product(intx, EventLogLength, 2000, \ 2858 "maximum nof events in event log") \ 2859 \ 2860 develop(intx, ProfilerPCTickThreshold, 15, \ 2861 "Number of ticks in a PC buckets to be a hotspot") \ 2862 \ 2863 notproduct(intx, DeoptimizeALotInterval, 5, \ 2864 "Number of exits until DeoptimizeALot kicks in") \ 2865 \ 2866 notproduct(intx, ZombieALotInterval, 5, \ 2867 "Number of exits until ZombieALot kicks in") \ 2868 \ 2869 develop(bool, StressNonEntrant, false, \ 2870 "Mark nmethods non-entrant at registration") \ 2871 \ 2872 diagnostic(intx, MallocVerifyInterval, 0, \ 2873 "if non-zero, verify C heap after every N calls to " \ 2874 "malloc/realloc/free") \ 2875 \ 2876 diagnostic(intx, MallocVerifyStart, 0, \ 2877 "if non-zero, start verifying C heap after Nth call to " \ 2878 "malloc/realloc/free") \ 2879 \ 2880 product(intx, TypeProfileWidth, 2, \ 2881 "number of receiver types to record in call/cast profile") \ 2882 \ 2883 develop(intx, BciProfileWidth, 2, \ 2884 "number of return bci's to record in ret profile") \ 2885 \ 2886 product(intx, PerMethodRecompilationCutoff, 400, \ 2887 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2888 \ 2889 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2890 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2891 \ 2892 product(intx, PerMethodTrapLimit, 100, \ 2893 "Limit on traps (of one kind) in a method (includes inlines)") \ 2894 \ 2895 product(intx, PerBytecodeTrapLimit, 4, \ 2896 "Limit on traps (of one kind) at a particular BCI") \ 2897 \ 2898 develop(intx, FreqCountInvocations, 1, \ 2899 "Scaling factor for branch frequencies (deprecated)") \ 2900 \ 2901 develop(intx, InlineFrequencyRatio, 20, \ 2902 "Ratio of call site execution to caller method invocation") \ 2903 \ 2904 develop_pd(intx, InlineFrequencyCount, \ 2905 "Count of call site execution necessary to trigger frequent " \ 2906 "inlining") \ 2907 \ 2908 develop(intx, InlineThrowCount, 50, \ 2909 "Force inlining of interpreted methods that throw this often") \ 2910 \ 2911 develop(intx, InlineThrowMaxSize, 200, \ 2912 "Force inlining of throwing methods smaller than this") \ 2913 \ 2914 product(intx, AliasLevel, 3, \ 2915 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2916 "2 for class split, 3 for unique instances") \ 2917 \ 2918 develop(bool, VerifyAliases, false, \ 2919 "perform extra checks on the results of alias analysis") \ 2920 \ 2921 develop(intx, ProfilerNodeSize, 1024, \ 2922 "Size in K to allocate for the Profile Nodes of each thread") \ 2923 \ 2924 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2925 "Number of times to spin wait on a v8 atomic operation lock") \ 2926 \ 2927 product(intx, ReadSpinIterations, 100, \ 2928 "Number of read attempts before a yield (spin inner loop)") \ 2929 \ 2930 product_pd(intx, PreInflateSpin, \ 2931 "Number of times to spin wait before inflation") \ 2932 \ 2933 product(intx, PreBlockSpin, 10, \ 2934 "Number of times to spin in an inflated lock before going to " \ 2935 "an OS lock") \ 2936 \ 2937 /* gc parameters */ \ 2938 product(uintx, InitialHeapSize, 0, \ 2939 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2940 \ 2941 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2942 "Maximum heap size (in bytes)") \ 2943 \ 2944 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2945 "Initial tenured generation size (in bytes)") \ 2946 \ 2947 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2948 "Initial new generation size (in bytes)") \ 2949 \ 2950 product(uintx, MaxNewSize, max_uintx, \ 2951 "Maximum new generation size (in bytes), max_uintx means set " \ 2952 "ergonomically") \ 2953 \ 2954 product(uintx, PretenureSizeThreshold, 0, \ 2955 "Maximum size in bytes of objects allocated in DefNew " \ 2956 "generation; zero means no maximum") \ 2957 \ 2958 product(uintx, TLABSize, 0, \ 2959 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2960 \ 2961 product(uintx, MinTLABSize, 2*K, \ 2962 "Minimum allowed TLAB size (in bytes)") \ 2963 \ 2964 product(uintx, TLABAllocationWeight, 35, \ 2965 "Allocation averaging weight") \ 2966 \ 2967 product(uintx, TLABWasteTargetPercent, 1, \ 2968 "Percentage of Eden that can be wasted") \ 2969 \ 2970 product(uintx, TLABRefillWasteFraction, 64, \ 2971 "Max TLAB waste at a refill (internal fragmentation)") \ 2972 \ 2973 product(uintx, TLABWasteIncrement, 4, \ 2974 "Increment allowed waste at slow allocation") \ 2975 \ 2976 product(intx, SurvivorRatio, 8, \ 2977 "Ratio of eden/survivor space size") \ 2978 \ 2979 product(intx, NewRatio, 2, \ 2980 "Ratio of new/old generation sizes") \ 2981 \ 2982 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2983 "Max percent of eden objects that will be live at scavenge") \ 2984 \ 2985 product_pd(uintx, NewSizeThreadIncrease, \ 2986 "Additional size added to desired new generation size per " \ 2987 "non-daemon thread (in bytes)") \ 2988 \ 2989 product_pd(uintx, PermSize, \ 2990 "Initial size of permanent generation (in bytes)") \ 2991 \ 2992 product_pd(uintx, MaxPermSize, \ 2993 "Maximum size of permanent generation (in bytes)") \ 2994 \ 2995 product(uintx, MinHeapFreeRatio, 40, \ 2996 "Min percentage of heap free after GC to avoid expansion") \ 2997 \ 2998 product(uintx, MaxHeapFreeRatio, 70, \ 2999 "Max percentage of heap free after GC to avoid shrinking") \ 3000 \ 3001 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3002 "Number of milliseconds per MB of free space in the heap") \ 3003 \ 3004 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3005 "Min change in heap space due to GC (in bytes)") \ 3006 \ 3007 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3008 "Min expansion of permanent heap (in bytes)") \ 3009 \ 3010 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3011 "Max expansion of permanent heap without full GC (in bytes)") \ 3012 \ 3013 product(intx, QueuedAllocationWarningCount, 0, \ 3014 "Number of times an allocation that queues behind a GC " \ 3015 "will retry before printing a warning") \ 3016 \ 3017 diagnostic(uintx, VerifyGCStartAt, 0, \ 3018 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3019 \ 3020 diagnostic(intx, VerifyGCLevel, 0, \ 3021 "Generation level at which to start +VerifyBefore/AfterGC") \ 3022 \ 3023 develop(uintx, ExitAfterGCNum, 0, \ 3024 "If non-zero, exit after this GC.") \ 3025 \ 3026 product(intx, MaxTenuringThreshold, 15, \ 3027 "Maximum value for tenuring threshold") \ 3028 \ 3029 product(intx, InitialTenuringThreshold, 7, \ 3030 "Initial value for tenuring threshold") \ 3031 \ 3032 product(intx, TargetSurvivorRatio, 50, \ 3033 "Desired percentage of survivor space used after scavenge") \ 3034 \ 3035 product(uintx, MarkSweepDeadRatio, 5, \ 3036 "Percentage (0-100) of the old gen allowed as dead wood." \ 3037 "Serial mark sweep treats this as both the min and max value." \ 3038 "CMS uses this value only if it falls back to mark sweep." \ 3039 "Par compact uses a variable scale based on the density of the" \ 3040 "generation and treats this as the max value when the heap is" \ 3041 "either completely full or completely empty. Par compact also" \ 3042 "has a smaller default value; see arguments.cpp.") \ 3043 \ 3044 product(uintx, PermMarkSweepDeadRatio, 20, \ 3045 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3046 "See MarkSweepDeadRatio for collector-specific comments.") \ 3047 \ 3048 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3049 "How often should we fully compact the heap (ignoring the dead " \ 3050 "space parameters)") \ 3051 \ 3052 product(intx, PrintCMSStatistics, 0, \ 3053 "Statistics for CMS") \ 3054 \ 3055 product(bool, PrintCMSInitiationStatistics, false, \ 3056 "Statistics for initiating a CMS collection") \ 3057 \ 3058 product(intx, PrintFLSStatistics, 0, \ 3059 "Statistics for CMS' FreeListSpace") \ 3060 \ 3061 product(intx, PrintFLSCensus, 0, \ 3062 "Census for CMS' FreeListSpace") \ 3063 \ 3064 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3065 "Delay in ms between expansion and allocation") \ 3066 \ 3067 product(intx, DeferThrSuspendLoopCount, 4000, \ 3068 "(Unstable) Number of times to iterate in safepoint loop " \ 3069 " before blocking VM threads ") \ 3070 \ 3071 product(intx, DeferPollingPageLoopCount, -1, \ 3072 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3073 "before changing safepoint polling page to RO ") \ 3074 \ 3075 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3076 \ 3077 product(bool, UseDepthFirstScavengeOrder, true, \ 3078 "true: the scavenge order will be depth-first, " \ 3079 "false: the scavenge order will be breadth-first") \ 3080 \ 3081 product(bool, PSChunkLargeArrays, true, \ 3082 "true: process large arrays in chunks") \ 3083 \ 3084 product(uintx, GCDrainStackTargetSize, 64, \ 3085 "how many entries we'll try to leave on the stack during " \ 3086 "parallel GC") \ 3087 \ 3088 /* stack parameters */ \ 3089 product_pd(intx, StackYellowPages, \ 3090 "Number of yellow zone (recoverable overflows) pages") \ 3091 \ 3092 product_pd(intx, StackRedPages, \ 3093 "Number of red zone (unrecoverable overflows) pages") \ 3094 \ 3095 product_pd(intx, StackShadowPages, \ 3096 "Number of shadow zone (for overflow checking) pages" \ 3097 " this should exceed the depth of the VM and native call stack") \ 3098 \ 3099 product_pd(intx, ThreadStackSize, \ 3100 "Thread Stack Size (in Kbytes)") \ 3101 \ 3102 product_pd(intx, VMThreadStackSize, \ 3103 "Non-Java Thread Stack Size (in Kbytes)") \ 3104 \ 3105 product_pd(intx, CompilerThreadStackSize, \ 3106 "Compiler Thread Stack Size (in Kbytes)") \ 3107 \ 3108 develop_pd(uintx, JVMInvokeMethodSlack, \ 3109 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3110 \ 3111 product(uintx, ThreadSafetyMargin, 50*M, \ 3112 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3113 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3114 "disable this feature") \ 3115 \ 3116 /* code cache parameters */ \ 3117 develop(uintx, CodeCacheSegmentSize, 64, \ 3118 "Code cache segment size (in bytes) - smallest unit of " \ 3119 "allocation") \ 3120 \ 3121 develop_pd(intx, CodeEntryAlignment, \ 3122 "Code entry alignment for generated code (in bytes)") \ 3123 \ 3124 product_pd(intx, OptoLoopAlignment, \ 3125 "Align inner loops to zero relative to this modulus") \ 3126 \ 3127 product_pd(uintx, InitialCodeCacheSize, \ 3128 "Initial code cache size (in bytes)") \ 3129 \ 3130 product_pd(uintx, ReservedCodeCacheSize, \ 3131 "Reserved code cache size (in bytes) - maximum code cache size") \ 3132 \ 3133 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3134 "When less than X space left, we stop compiling.") \ 3135 \ 3136 product_pd(uintx, CodeCacheExpansionSize, \ 3137 "Code cache expansion size (in bytes)") \ 3138 \ 3139 develop_pd(uintx, CodeCacheMinBlockLength, \ 3140 "Minimum number of segments in a code cache block.") \ 3141 \ 3142 notproduct(bool, ExitOnFullCodeCache, false, \ 3143 "Exit the VM if we fill the code cache.") \ 3144 \ 3145 product(bool, UseCodeCacheFlushing, false, \ 3146 "Attempt to clean the code cache before shutting off compiler") \ 3147 \ 3148 product(intx, MinCodeCacheFlushingInterval, 30, \ 3149 "Min number of seconds between code cache cleaning sessions") \ 3150 \ 3151 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3152 "When less than X space left, start code cache cleaning") \ 3153 \ 3154 /* interpreter debugging */ \ 3155 develop(intx, BinarySwitchThreshold, 5, \ 3156 "Minimal number of lookupswitch entries for rewriting to binary " \ 3157 "switch") \ 3158 \ 3159 develop(intx, StopInterpreterAt, 0, \ 3160 "Stops interpreter execution at specified bytecode number") \ 3161 \ 3162 develop(intx, TraceBytecodesAt, 0, \ 3163 "Traces bytecodes starting with specified bytecode number") \ 3164 \ 3165 /* compiler interface */ \ 3166 develop(intx, CIStart, 0, \ 3167 "the id of the first compilation to permit") \ 3168 \ 3169 develop(intx, CIStop, -1, \ 3170 "the id of the last compilation to permit") \ 3171 \ 3172 develop(intx, CIStartOSR, 0, \ 3173 "the id of the first osr compilation to permit " \ 3174 "(CICountOSR must be on)") \ 3175 \ 3176 develop(intx, CIStopOSR, -1, \ 3177 "the id of the last osr compilation to permit " \ 3178 "(CICountOSR must be on)") \ 3179 \ 3180 develop(intx, CIBreakAtOSR, -1, \ 3181 "id of osr compilation to break at") \ 3182 \ 3183 develop(intx, CIBreakAt, -1, \ 3184 "id of compilation to break at") \ 3185 \ 3186 product(ccstrlist, CompileOnly, "", \ 3187 "List of methods (pkg/class.name) to restrict compilation to") \ 3188 \ 3189 product(ccstr, CompileCommandFile, NULL, \ 3190 "Read compiler commands from this file [.hotspot_compiler]") \ 3191 \ 3192 product(ccstrlist, CompileCommand, "", \ 3193 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3194 \ 3195 product(bool, CICompilerCountPerCPU, false, \ 3196 "1 compiler thread for log(N CPUs)") \ 3197 \ 3198 develop(intx, CIFireOOMAt, -1, \ 3199 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3200 "(non-negative value throws OOM after this many CI accesses " \ 3201 "in each compile)") \ 3202 \ 3203 develop(intx, CIFireOOMAtDelay, -1, \ 3204 "Wait for this many CI accesses to occur in all compiles before " \ 3205 "beginning to throw OutOfMemoryErrors in each compile") \ 3206 \ 3207 notproduct(bool, CIObjectFactoryVerify, false, \ 3208 "enable potentially expensive verification in ciObjectFactory") \ 3209 \ 3210 /* Priorities */ \ 3211 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3212 \ 3213 product(intx, ThreadPriorityPolicy, 0, \ 3214 "0 : Normal. "\ 3215 " VM chooses priorities that are appropriate for normal "\ 3216 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3217 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3218 " map to lower native priority values. On Windows applications"\ 3219 " are allowed to use higher native priorities. However, with "\ 3220 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3221 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3222 " interfere with system threads. On Linux thread priorities "\ 3223 " are ignored because the OS does not support static priority "\ 3224 " in SCHED_OTHER scheduling class which is the only choice for"\ 3225 " non-root, non-realtime applications. "\ 3226 "1 : Aggressive. "\ 3227 " Java thread priorities map over to the entire range of "\ 3228 " native thread priorities. Higher Java thread priorities map "\ 3229 " to higher native thread priorities. This policy should be "\ 3230 " used with care, as sometimes it can cause performance "\ 3231 " degradation in the application and/or the entire system. On "\ 3232 " Linux this policy requires root privilege.") \ 3233 \ 3234 product(bool, ThreadPriorityVerbose, false, \ 3235 "print priority changes") \ 3236 \ 3237 product(intx, DefaultThreadPriority, -1, \ 3238 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3239 \ 3240 product(intx, CompilerThreadPriority, -1, \ 3241 "what priority should compiler threads run at (-1 means no change)") \ 3242 \ 3243 product(intx, VMThreadPriority, -1, \ 3244 "what priority should VM threads run at (-1 means no change)") \ 3245 \ 3246 product(bool, CompilerThreadHintNoPreempt, true, \ 3247 "(Solaris only) Give compiler threads an extra quanta") \ 3248 \ 3249 product(bool, VMThreadHintNoPreempt, false, \ 3250 "(Solaris only) Give VM thread an extra quanta") \ 3251 \ 3252 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3253 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3254 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3255 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3256 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3257 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3258 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3259 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3260 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3261 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3262 \ 3263 /* compiler debugging */ \ 3264 notproduct(intx, CompileTheWorldStartAt, 1, \ 3265 "First class to consider when using +CompileTheWorld") \ 3266 \ 3267 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3268 "Last class to consider when using +CompileTheWorld") \ 3269 \ 3270 develop(intx, NewCodeParameter, 0, \ 3271 "Testing Only: Create a dedicated integer parameter before " \ 3272 "putback") \ 3273 \ 3274 /* new oopmap storage allocation */ \ 3275 develop(intx, MinOopMapAllocation, 8, \ 3276 "Minimum number of OopMap entries in an OopMapSet") \ 3277 \ 3278 /* Background Compilation */ \ 3279 develop(intx, LongCompileThreshold, 50, \ 3280 "Used with +TraceLongCompiles") \ 3281 \ 3282 product(intx, StarvationMonitorInterval, 200, \ 3283 "Pause between each check in ms") \ 3284 \ 3285 /* recompilation */ \ 3286 product_pd(intx, CompileThreshold, \ 3287 "number of interpreted method invocations before (re-)compiling") \ 3288 \ 3289 product_pd(intx, BackEdgeThreshold, \ 3290 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3291 \ 3292 product(intx, Tier1BytecodeLimit, 10, \ 3293 "Must have at least this many bytecodes before tier1" \ 3294 "invocation counters are used") \ 3295 \ 3296 product_pd(intx, Tier2CompileThreshold, \ 3297 "threshold at which a tier 2 compilation is invoked") \ 3298 \ 3299 product_pd(intx, Tier2BackEdgeThreshold, \ 3300 "Back edge threshold at which a tier 2 compilation is invoked") \ 3301 \ 3302 product_pd(intx, Tier3CompileThreshold, \ 3303 "threshold at which a tier 3 compilation is invoked") \ 3304 \ 3305 product_pd(intx, Tier3BackEdgeThreshold, \ 3306 "Back edge threshold at which a tier 3 compilation is invoked") \ 3307 \ 3308 product_pd(intx, Tier4CompileThreshold, \ 3309 "threshold at which a tier 4 compilation is invoked") \ 3310 \ 3311 product_pd(intx, Tier4BackEdgeThreshold, \ 3312 "Back edge threshold at which a tier 4 compilation is invoked") \ 3313 \ 3314 product_pd(bool, TieredCompilation, \ 3315 "Enable two-tier compilation") \ 3316 \ 3317 product(bool, StressTieredRuntime, false, \ 3318 "Alternate client and server compiler on compile requests") \ 3319 \ 3320 product_pd(intx, OnStackReplacePercentage, \ 3321 "NON_TIERED number of method invocations/branches (expressed as %"\ 3322 "of CompileThreshold) before (re-)compiling OSR code") \ 3323 \ 3324 product(intx, InterpreterProfilePercentage, 33, \ 3325 "NON_TIERED number of method invocations/branches (expressed as %"\ 3326 "of CompileThreshold) before profiling in the interpreter") \ 3327 \ 3328 develop(intx, MaxRecompilationSearchLength, 10, \ 3329 "max. # frames to inspect searching for recompilee") \ 3330 \ 3331 develop(intx, MaxInterpretedSearchLength, 3, \ 3332 "max. # interp. frames to skip when searching for recompilee") \ 3333 \ 3334 develop(intx, DesiredMethodLimit, 8000, \ 3335 "desired max. method size (in bytecodes) after inlining") \ 3336 \ 3337 develop(intx, HugeMethodLimit, 8000, \ 3338 "don't compile methods larger than this if " \ 3339 "+DontCompileHugeMethods") \ 3340 \ 3341 /* New JDK 1.4 reflection implementation */ \ 3342 \ 3343 develop(bool, UseNewReflection, true, \ 3344 "Temporary flag for transition to reflection based on dynamic " \ 3345 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3346 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3347 "changes were needed") \ 3348 \ 3349 develop(bool, VerifyReflectionBytecodes, false, \ 3350 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3351 "in situations like that described in 4486457 or for " \ 3352 "constructors generated for serialization, so can not be enabled "\ 3353 "in product.") \ 3354 \ 3355 product(bool, ReflectionWrapResolutionErrors, true, \ 3356 "Temporary flag for transition to AbstractMethodError wrapped " \ 3357 "in InvocationTargetException. See 6531596") \ 3358 \ 3359 \ 3360 develop(intx, FastSuperclassLimit, 8, \ 3361 "Depth of hardwired instanceof accelerator array") \ 3362 \ 3363 /* Properties for Java libraries */ \ 3364 \ 3365 product(intx, MaxDirectMemorySize, -1, \ 3366 "Maximum total size of NIO direct-buffer allocations") \ 3367 \ 3368 /* temporary developer defined flags */ \ 3369 \ 3370 diagnostic(bool, UseNewCode, false, \ 3371 "Testing Only: Use the new version while testing") \ 3372 \ 3373 diagnostic(bool, UseNewCode2, false, \ 3374 "Testing Only: Use the new version while testing") \ 3375 \ 3376 diagnostic(bool, UseNewCode3, false, \ 3377 "Testing Only: Use the new version while testing") \ 3378 \ 3379 /* flags for performance data collection */ \ 3380 \ 3381 product(bool, UsePerfData, true, \ 3382 "Flag to disable jvmstat instrumentation for performance testing" \ 3383 "and problem isolation purposes.") \ 3384 \ 3385 product(bool, PerfDataSaveToFile, false, \ 3386 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3387 \ 3388 product(ccstr, PerfDataSaveFile, NULL, \ 3389 "Save PerfData memory to the specified absolute pathname," \ 3390 "%p in the file name if present will be replaced by pid") \ 3391 \ 3392 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3393 "Data sampling interval in milliseconds") \ 3394 \ 3395 develop(bool, PerfTraceDataCreation, false, \ 3396 "Trace creation of Performance Data Entries") \ 3397 \ 3398 develop(bool, PerfTraceMemOps, false, \ 3399 "Trace PerfMemory create/attach/detach calls") \ 3400 \ 3401 product(bool, PerfDisableSharedMem, false, \ 3402 "Store performance data in standard memory") \ 3403 \ 3404 product(intx, PerfDataMemorySize, 32*K, \ 3405 "Size of performance data memory region. Will be rounded " \ 3406 "up to a multiple of the native os page size.") \ 3407 \ 3408 product(intx, PerfMaxStringConstLength, 1024, \ 3409 "Maximum PerfStringConstant string length before truncation") \ 3410 \ 3411 product(bool, PerfAllowAtExitRegistration, false, \ 3412 "Allow registration of atexit() methods") \ 3413 \ 3414 product(bool, PerfBypassFileSystemCheck, false, \ 3415 "Bypass Win32 file system criteria checks (Windows Only)") \ 3416 \ 3417 product(intx, UnguardOnExecutionViolation, 0, \ 3418 "Unguard page and retry on no-execute fault (Win32 only)" \ 3419 "0=off, 1=conservative, 2=aggressive") \ 3420 \ 3421 /* Serviceability Support */ \ 3422 \ 3423 product(bool, ManagementServer, false, \ 3424 "Create JMX Management Server") \ 3425 \ 3426 product(bool, DisableAttachMechanism, false, \ 3427 "Disable mechanism that allows tools to attach to this VM") \ 3428 \ 3429 product(bool, StartAttachListener, false, \ 3430 "Always start Attach Listener at VM startup") \ 3431 \ 3432 manageable(bool, PrintConcurrentLocks, false, \ 3433 "Print java.util.concurrent locks in thread dump") \ 3434 \ 3435 /* Shared spaces */ \ 3436 \ 3437 product(bool, UseSharedSpaces, true, \ 3438 "Use shared spaces in the permanent generation") \ 3439 \ 3440 product(bool, RequireSharedSpaces, false, \ 3441 "Require shared spaces in the permanent generation") \ 3442 \ 3443 product(bool, ForceSharedSpaces, false, \ 3444 "Require shared spaces in the permanent generation") \ 3445 \ 3446 product(bool, DumpSharedSpaces, false, \ 3447 "Special mode: JVM reads a class list, loads classes, builds " \ 3448 "shared spaces, and dumps the shared spaces to a file to be " \ 3449 "used in future JVM runs.") \ 3450 \ 3451 product(bool, PrintSharedSpaces, false, \ 3452 "Print usage of shared spaces") \ 3453 \ 3454 product(uintx, SharedDummyBlockSize, 512*M, \ 3455 "Size of dummy block used to shift heap addresses (in bytes)") \ 3456 \ 3457 product(uintx, SharedReadWriteSize, 12*M, \ 3458 "Size of read-write space in permanent generation (in bytes)") \ 3459 \ 3460 product(uintx, SharedReadOnlySize, 10*M, \ 3461 "Size of read-only space in permanent generation (in bytes)") \ 3462 \ 3463 product(uintx, SharedMiscDataSize, 4*M, \ 3464 "Size of the shared data area adjacent to the heap (in bytes)") \ 3465 \ 3466 product(uintx, SharedMiscCodeSize, 4*M, \ 3467 "Size of the shared code area adjacent to the heap (in bytes)") \ 3468 \ 3469 diagnostic(bool, SharedOptimizeColdStart, true, \ 3470 "At dump time, order shared objects to achieve better " \ 3471 "cold startup time.") \ 3472 \ 3473 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3474 "Reordering policy for SharedOptimizeColdStart " \ 3475 "0=favor classload-time locality, 1=balanced, " \ 3476 "2=favor runtime locality") \ 3477 \ 3478 diagnostic(bool, SharedSkipVerify, false, \ 3479 "Skip assert() and verify() which page-in unwanted shared " \ 3480 "objects. ") \ 3481 \ 3482 product(bool, AnonymousClasses, false, \ 3483 "support sun.misc.Unsafe.defineAnonymousClass") \ 3484 \ 3485 experimental(bool, EnableMethodHandles, false, \ 3486 "support method handles (true by default under JSR 292)") \ 3487 \ 3488 diagnostic(intx, MethodHandlePushLimit, 3, \ 3489 "number of additional stack slots a method handle may push") \ 3490 \ 3491 develop(bool, TraceMethodHandles, false, \ 3492 "trace internal method handle operations") \ 3493 \ 3494 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3495 "perform extra checks when constructing method handles") \ 3496 \ 3497 diagnostic(bool, OptimizeMethodHandles, true, \ 3498 "when constructing method handles, try to improve them") \ 3499 \ 3500 experimental(bool, TrustFinalNonStaticFields, false, \ 3501 "trust final non-static declarations for constant folding") \ 3502 \ 3503 experimental(bool, EnableInvokeDynamic, false, \ 3504 "recognize the invokedynamic instruction") \ 3505 \ 3506 develop(bool, TraceInvokeDynamic, false, \ 3507 "trace internal invoke dynamic operations") \ 3508 \ 3509 product(bool, TaggedStackInterpreter, false, \ 3510 "Insert tags in interpreter execution stack for oopmap generaion")\ 3511 \ 3512 diagnostic(bool, PauseAtStartup, false, \ 3513 "Causes the VM to pause at startup time and wait for the pause " \ 3514 "file to be removed (default: ./vm.paused.<pid>)") \ 3515 \ 3516 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3517 "The file to create and for whose removal to await when pausing " \ 3518 "at startup. (default: ./vm.paused.<pid>)") \ 3519 \ 3520 product(bool, ExtendedDTraceProbes, false, \ 3521 "Enable performance-impacting dtrace probes") \ 3522 \ 3523 product(bool, DTraceMethodProbes, false, \ 3524 "Enable dtrace probes for method-entry and method-exit") \ 3525 \ 3526 product(bool, DTraceAllocProbes, false, \ 3527 "Enable dtrace probes for object allocation") \ 3528 \ 3529 product(bool, DTraceMonitorProbes, false, \ 3530 "Enable dtrace probes for monitor events") \ 3531 \ 3532 product(bool, RelaxAccessControlCheck, false, \ 3533 "Relax the access control checks in the verifier") \ 3534 \ 3535 diagnostic(bool, PrintDTraceDOF, false, \ 3536 "Print the DTrace DOF passed to the system for JSDT probes") \ 3537 \ 3538 product(bool, UseVMInterruptibleIO, false, \ 3539 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3540 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3541 " of this flag is true for JDK 6 and earliers") 3542 3543 3544/* 3545 * Macros for factoring of globals 3546 */ 3547 3548// Interface macros 3549#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3550#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3551#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3552#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3553#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3554#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3555#ifdef PRODUCT 3556#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3557#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3558#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3559#else 3560#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3561#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3562#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3563#endif 3564// Special LP64 flags, product only needed for now. 3565#ifdef _LP64 3566#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3567#else 3568#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3569#endif // _LP64 3570 3571// Implementation macros 3572#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3573#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3574#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3575#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3576#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3577#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3578#ifdef PRODUCT 3579#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3580#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3581#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3582#else 3583#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3584#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3585#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3586#endif 3587#ifdef _LP64 3588#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3589#else 3590#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3591#endif // _LP64 3592 3593RUNTIME_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) 3594 3595RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3596