globals.hpp revision 775:93c14e5562c4
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, NewRatio, 4); 53define_pd_global(intx, InlineClassNatives, true); 54define_pd_global(intx, InlineUnsafeOps, true); 55define_pd_global(intx, InitialCodeCacheSize, 160*K); 56define_pd_global(intx, ReservedCodeCacheSize, 32*M); 57define_pd_global(intx, CodeCacheExpansionSize, 32*K); 58define_pd_global(intx, CodeCacheMinBlockLength, 1); 59define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 60define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 61define_pd_global(bool, NeverActAsServerClassMachine, true); 62define_pd_global(uintx, DefaultMaxRAM, 1*G); 63#define CI_COMPILER_COUNT 0 64#else 65 66#ifdef COMPILER2 67#define CI_COMPILER_COUNT 2 68#else 69#define CI_COMPILER_COUNT 1 70#endif // COMPILER2 71 72#endif // no compilers 73 74 75// string type aliases used only in this file 76typedef const char* ccstr; 77typedef const char* ccstrlist; // represents string arguments which accumulate 78 79enum FlagValueOrigin { 80 DEFAULT = 0, 81 COMMAND_LINE = 1, 82 ENVIRON_VAR = 2, 83 CONFIG_FILE = 3, 84 MANAGEMENT = 4, 85 ERGONOMIC = 5, 86 ATTACH_ON_DEMAND = 6, 87 INTERNAL = 99 88}; 89 90struct Flag { 91 const char *type; 92 const char *name; 93 void* addr; 94 const char *kind; 95 FlagValueOrigin origin; 96 97 // points to all Flags static array 98 static Flag *flags; 99 100 // number of flags 101 static size_t numFlags; 102 103 static Flag* find_flag(char* name, size_t length); 104 105 bool is_bool() const { return strcmp(type, "bool") == 0; } 106 bool get_bool() const { return *((bool*) addr); } 107 void set_bool(bool value) { *((bool*) addr) = value; } 108 109 bool is_intx() const { return strcmp(type, "intx") == 0; } 110 intx get_intx() const { return *((intx*) addr); } 111 void set_intx(intx value) { *((intx*) addr) = value; } 112 113 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 114 uintx get_uintx() const { return *((uintx*) addr); } 115 void set_uintx(uintx value) { *((uintx*) addr) = value; } 116 117 bool is_double() const { return strcmp(type, "double") == 0; } 118 double get_double() const { return *((double*) addr); } 119 void set_double(double value) { *((double*) addr) = value; } 120 121 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 122 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 123 ccstr get_ccstr() const { return *((ccstr*) addr); } 124 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 125 126 bool is_unlocker() const; 127 bool is_unlocked() const; 128 bool is_writeable() const; 129 bool is_external() const; 130 131 void print_on(outputStream* st); 132 void print_as_flag(outputStream* st); 133}; 134 135// debug flags control various aspects of the VM and are global accessible 136 137// use FlagSetting to temporarily change some debug flag 138// e.g. FlagSetting fs(DebugThisAndThat, true); 139// restored to previous value upon leaving scope 140class FlagSetting { 141 bool val; 142 bool* flag; 143 public: 144 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 145 ~FlagSetting() { *flag = val; } 146}; 147 148 149class CounterSetting { 150 intx* counter; 151 public: 152 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 153 ~CounterSetting() { (*counter)--; } 154}; 155 156 157class IntFlagSetting { 158 intx val; 159 intx* flag; 160 public: 161 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 162 ~IntFlagSetting() { *flag = val; } 163}; 164 165 166class DoubleFlagSetting { 167 double val; 168 double* flag; 169 public: 170 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 171 ~DoubleFlagSetting() { *flag = val; } 172}; 173 174 175class CommandLineFlags { 176 public: 177 static bool boolAt(char* name, size_t len, bool* value); 178 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 179 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 180 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 181 182 static bool intxAt(char* name, size_t len, intx* value); 183 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 184 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 185 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 186 187 static bool uintxAt(char* name, size_t len, uintx* value); 188 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 189 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 190 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 191 192 static bool doubleAt(char* name, size_t len, double* value); 193 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 194 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 195 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 196 197 static bool ccstrAt(char* name, size_t len, ccstr* value); 198 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 199 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 200 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 201 202 // Returns false if name is not a command line flag. 203 static bool wasSetOnCmdline(const char* name, bool* value); 204 static void printSetFlags(); 205 206 static void printFlags() PRODUCT_RETURN; 207 208 static void verify() PRODUCT_RETURN; 209}; 210 211// use this for flags that are true by default in the debug version but 212// false in the optimized version, and vice versa 213#ifdef ASSERT 214#define trueInDebug true 215#define falseInDebug false 216#else 217#define trueInDebug false 218#define falseInDebug true 219#endif 220 221// use this for flags that are true per default in the product build 222// but false in development builds, and vice versa 223#ifdef PRODUCT 224#define trueInProduct true 225#define falseInProduct false 226#else 227#define trueInProduct false 228#define falseInProduct true 229#endif 230 231// use this for flags that are true per default in the tiered build 232// but false in non-tiered builds, and vice versa 233#ifdef TIERED 234#define trueInTiered true 235#define falseInTiered false 236#else 237#define trueInTiered false 238#define falseInTiered true 239#endif 240 241// develop flags are settable / visible only during development and are constant in the PRODUCT version 242// product flags are always settable / visible 243// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 244 245// A flag must be declared with one of the following types: 246// bool, intx, uintx, ccstr. 247// The type "ccstr" is an alias for "const char*" and is used 248// only in this file, because the macrology requires single-token type names. 249 250// Note: Diagnostic options not meant for VM tuning or for product modes. 251// They are to be used for VM quality assurance or field diagnosis 252// of VM bugs. They are hidden so that users will not be encouraged to 253// try them as if they were VM ordinary execution options. However, they 254// are available in the product version of the VM. Under instruction 255// from support engineers, VM customers can turn them on to collect 256// diagnostic information about VM problems. To use a VM diagnostic 257// option, you must first specify +UnlockDiagnosticVMOptions. 258// (This master switch also affects the behavior of -Xprintflags.) 259// 260// experimental flags are in support of features that are not 261// part of the officially supported product, but are available 262// for experimenting with. They could, for example, be performance 263// features that may not have undergone full or rigorous QA, but which may 264// help performance in some cases and released for experimentation 265// by the community of users and developers. This flag also allows one to 266// be able to build a fully supported product that nonetheless also 267// ships with some unsupported, lightly tested, experimental features. 268// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 269// UnlockExperimentalVMOptions flag, which allows the control and 270// modification of the experimental flags. 271// 272// manageable flags are writeable external product flags. 273// They are dynamically writeable through the JDK management interface 274// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 275// These flags are external exported interface (see CCC). The list of 276// manageable flags can be queried programmatically through the management 277// interface. 278// 279// A flag can be made as "manageable" only if 280// - the flag is defined in a CCC as an external exported interface. 281// - the VM implementation supports dynamic setting of the flag. 282// This implies that the VM must *always* query the flag variable 283// and not reuse state related to the flag state at any given time. 284// - you want the flag to be queried programmatically by the customers. 285// 286// product_rw flags are writeable internal product flags. 287// They are like "manageable" flags but for internal/private use. 288// The list of product_rw flags are internal/private flags which 289// may be changed/removed in a future release. It can be set 290// through the management interface to get/set value 291// when the name of flag is supplied. 292// 293// A flag can be made as "product_rw" only if 294// - the VM implementation supports dynamic setting of the flag. 295// This implies that the VM must *always* query the flag variable 296// and not reuse state related to the flag state at any given time. 297// 298// Note that when there is a need to support develop flags to be writeable, 299// it can be done in the same way as product_rw. 300 301#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 302 \ 303 lp64_product(bool, UseCompressedOops, false, \ 304 "Use 32-bit object references in 64-bit VM. " \ 305 "lp64_product means flag is always constant in 32 bit VM") \ 306 \ 307 notproduct(bool, CheckCompressedOops, true, \ 308 "generate checks in encoding/decoding code in debug VM") \ 309 \ 310 product_pd(uintx, HeapBaseMinAddress, \ 311 "OS specific low limit for heap base address") \ 312 \ 313 diagnostic(bool, PrintCompressedOopsMode, false, \ 314 "Print compressed oops base address and encoding mode") \ 315 \ 316 /* UseMembar is theoretically a temp flag used for memory barrier \ 317 * removal testing. It was supposed to be removed before FCS but has \ 318 * been re-added (see 6401008) */ \ 319 product(bool, UseMembar, false, \ 320 "(Unstable) Issues membars on thread state transitions") \ 321 \ 322 product(bool, PrintCommandLineFlags, false, \ 323 "Prints flags that appeared on the command line") \ 324 \ 325 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 326 "Enable normal processing of flags relating to field diagnostics")\ 327 \ 328 experimental(bool, UnlockExperimentalVMOptions, false, \ 329 "Enable normal processing of flags relating to experimental features")\ 330 \ 331 product(bool, JavaMonitorsInStackTrace, true, \ 332 "Print info. about Java monitor locks when the stacks are dumped")\ 333 \ 334 product_pd(bool, UseLargePages, \ 335 "Use large page memory") \ 336 \ 337 product_pd(bool, UseLargePagesIndividualAllocation, \ 338 "Allocate large pages individually for better affinity") \ 339 \ 340 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 341 "Fail large pages individual allocation") \ 342 \ 343 develop(bool, TracePageSizes, false, \ 344 "Trace page size selection and usage.") \ 345 \ 346 product(bool, UseNUMA, false, \ 347 "Use NUMA if available") \ 348 \ 349 product(bool, ForceNUMA, false, \ 350 "Force NUMA optimizations on single-node/UMA systems") \ 351 \ 352 product(intx, NUMAChunkResizeWeight, 20, \ 353 "Percentage (0-100) used to weight the current sample when " \ 354 "computing exponentially decaying average for " \ 355 "AdaptiveNUMAChunkSizing") \ 356 \ 357 product(intx, NUMASpaceResizeRate, 1*G, \ 358 "Do not reallocate more that this amount per collection") \ 359 \ 360 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 361 "Enable adaptive chunk sizing for NUMA") \ 362 \ 363 product(bool, NUMAStats, false, \ 364 "Print NUMA stats in detailed heap information") \ 365 \ 366 product(intx, NUMAPageScanRate, 256, \ 367 "Maximum number of pages to include in the page scan procedure") \ 368 \ 369 product_pd(bool, NeedsDeoptSuspend, \ 370 "True for register window machines (sparc/ia64)") \ 371 \ 372 product(intx, UseSSE, 99, \ 373 "Highest supported SSE instructions set on x86/x64") \ 374 \ 375 product(uintx, LargePageSizeInBytes, 0, \ 376 "Large page size (0 to let VM choose the page size") \ 377 \ 378 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 379 "Use large pages if max heap is at least this big") \ 380 \ 381 product(bool, ForceTimeHighResolution, false, \ 382 "Using high time resolution(For Win32 only)") \ 383 \ 384 develop(bool, TraceItables, false, \ 385 "Trace initialization and use of itables") \ 386 \ 387 develop(bool, TracePcPatching, false, \ 388 "Trace usage of frame::patch_pc") \ 389 \ 390 develop(bool, TraceJumps, false, \ 391 "Trace assembly jumps in thread ring buffer") \ 392 \ 393 develop(bool, TraceRelocator, false, \ 394 "Trace the bytecode relocator") \ 395 \ 396 develop(bool, TraceLongCompiles, false, \ 397 "Print out every time compilation is longer than " \ 398 "a given threashold") \ 399 \ 400 develop(bool, SafepointALot, false, \ 401 "Generates a lot of safepoints. Works with " \ 402 "GuaranteedSafepointInterval") \ 403 \ 404 product_pd(bool, BackgroundCompilation, \ 405 "A thread requesting compilation is not blocked during " \ 406 "compilation") \ 407 \ 408 product(bool, PrintVMQWaitTime, false, \ 409 "Prints out the waiting time in VM operation queue") \ 410 \ 411 develop(bool, BailoutToInterpreterForThrows, false, \ 412 "Compiled methods which throws/catches exceptions will be " \ 413 "deopt and intp.") \ 414 \ 415 develop(bool, NoYieldsInMicrolock, false, \ 416 "Disable yields in microlock") \ 417 \ 418 develop(bool, TraceOopMapGeneration, false, \ 419 "Shows oopmap generation") \ 420 \ 421 product(bool, MethodFlushing, true, \ 422 "Reclamation of zombie and not-entrant methods") \ 423 \ 424 develop(bool, VerifyStack, false, \ 425 "Verify stack of each thread when it is entering a runtime call") \ 426 \ 427 develop(bool, ForceUnreachable, false, \ 428 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 429 \ 430 notproduct(bool, StressDerivedPointers, false, \ 431 "Force scavenge when a derived pointers is detected on stack " \ 432 "after rtm call") \ 433 \ 434 develop(bool, TraceDerivedPointers, false, \ 435 "Trace traversal of derived pointers on stack") \ 436 \ 437 notproduct(bool, TraceCodeBlobStacks, false, \ 438 "Trace stack-walk of codeblobs") \ 439 \ 440 product(bool, PrintJNIResolving, false, \ 441 "Used to implement -v:jni") \ 442 \ 443 notproduct(bool, PrintRewrites, false, \ 444 "Print methods that are being rewritten") \ 445 \ 446 product(bool, UseInlineCaches, true, \ 447 "Use Inline Caches for virtual calls ") \ 448 \ 449 develop(bool, InlineArrayCopy, true, \ 450 "inline arraycopy native that is known to be part of " \ 451 "base library DLL") \ 452 \ 453 develop(bool, InlineObjectHash, true, \ 454 "inline Object::hashCode() native that is known to be part " \ 455 "of base library DLL") \ 456 \ 457 develop(bool, InlineObjectCopy, true, \ 458 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 459 \ 460 develop(bool, InlineNatives, true, \ 461 "inline natives that are known to be part of base library DLL") \ 462 \ 463 develop(bool, InlineMathNatives, true, \ 464 "inline SinD, CosD, etc.") \ 465 \ 466 develop(bool, InlineClassNatives, true, \ 467 "inline Class.isInstance, etc") \ 468 \ 469 develop(bool, InlineAtomicLong, true, \ 470 "inline sun.misc.AtomicLong") \ 471 \ 472 develop(bool, InlineThreadNatives, true, \ 473 "inline Thread.currentThread, etc") \ 474 \ 475 develop(bool, InlineReflectionGetCallerClass, true, \ 476 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 477 "of base library DLL") \ 478 \ 479 develop(bool, InlineUnsafeOps, true, \ 480 "inline memory ops (native methods) from sun.misc.Unsafe") \ 481 \ 482 develop(bool, ConvertCmpD2CmpF, true, \ 483 "Convert cmpD to cmpF when one input is constant in float range") \ 484 \ 485 develop(bool, ConvertFloat2IntClipping, true, \ 486 "Convert float2int clipping idiom to integer clipping") \ 487 \ 488 develop(bool, SpecialStringCompareTo, true, \ 489 "special version of string compareTo") \ 490 \ 491 develop(bool, SpecialStringIndexOf, true, \ 492 "special version of string indexOf") \ 493 \ 494 develop(bool, SpecialStringEquals, true, \ 495 "special version of string equals") \ 496 \ 497 develop(bool, SpecialArraysEquals, true, \ 498 "special version of Arrays.equals(char[],char[])") \ 499 \ 500 product(bool, UseSSE42Intrinsics, false, \ 501 "SSE4.2 versions of intrinsics") \ 502 \ 503 develop(bool, TraceCallFixup, false, \ 504 "traces all call fixups") \ 505 \ 506 develop(bool, DeoptimizeALot, false, \ 507 "deoptimize at every exit from the runtime system") \ 508 \ 509 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 510 "a comma separated list of bcis to deoptimize at") \ 511 \ 512 product(bool, DeoptimizeRandom, false, \ 513 "deoptimize random frames on random exit from the runtime system")\ 514 \ 515 notproduct(bool, ZombieALot, false, \ 516 "creates zombies (non-entrant) at exit from the runt. system") \ 517 \ 518 notproduct(bool, WalkStackALot, false, \ 519 "trace stack (no print) at every exit from the runtime system") \ 520 \ 521 develop(bool, Debugging, false, \ 522 "set when executing debug methods in debug.ccp " \ 523 "(to prevent triggering assertions)") \ 524 \ 525 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 526 "Enable strict checks that safepoints cannot happen for threads " \ 527 "that used No_Safepoint_Verifier") \ 528 \ 529 notproduct(bool, VerifyLastFrame, false, \ 530 "Verify oops on last frame on entry to VM") \ 531 \ 532 develop(bool, TraceHandleAllocation, false, \ 533 "Prints out warnings when suspicious many handles are allocated") \ 534 \ 535 product(bool, UseCompilerSafepoints, true, \ 536 "Stop at safepoints in compiled code") \ 537 \ 538 product(bool, UseSplitVerifier, true, \ 539 "use split verifier with StackMapTable attributes") \ 540 \ 541 product(bool, FailOverToOldVerifier, true, \ 542 "fail over to old verifier when split verifier fails") \ 543 \ 544 develop(bool, ShowSafepointMsgs, false, \ 545 "Show msg. about safepoint synch.") \ 546 \ 547 product(bool, SafepointTimeout, false, \ 548 "Time out and warn or fail after SafepointTimeoutDelay " \ 549 "milliseconds if failed to reach safepoint") \ 550 \ 551 develop(bool, DieOnSafepointTimeout, false, \ 552 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 553 \ 554 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 555 /* typically, at most a few retries are needed */ \ 556 product(intx, SuspendRetryCount, 50, \ 557 "Maximum retry count for an external suspend request") \ 558 \ 559 product(intx, SuspendRetryDelay, 5, \ 560 "Milliseconds to delay per retry (* current_retry_count)") \ 561 \ 562 product(bool, AssertOnSuspendWaitFailure, false, \ 563 "Assert/Guarantee on external suspend wait failure") \ 564 \ 565 product(bool, TraceSuspendWaitFailures, false, \ 566 "Trace external suspend wait failures") \ 567 \ 568 product(bool, MaxFDLimit, true, \ 569 "Bump the number of file descriptors to max in solaris.") \ 570 \ 571 notproduct(bool, LogEvents, trueInDebug, \ 572 "Enable Event log") \ 573 \ 574 product(bool, BytecodeVerificationRemote, true, \ 575 "Enables the Java bytecode verifier for remote classes") \ 576 \ 577 product(bool, BytecodeVerificationLocal, false, \ 578 "Enables the Java bytecode verifier for local classes") \ 579 \ 580 develop(bool, ForceFloatExceptions, trueInDebug, \ 581 "Force exceptions on FP stack under/overflow") \ 582 \ 583 develop(bool, SoftMatchFailure, trueInProduct, \ 584 "If the DFA fails to match a node, print a message and bail out") \ 585 \ 586 develop(bool, VerifyStackAtCalls, false, \ 587 "Verify that the stack pointer is unchanged after calls") \ 588 \ 589 develop(bool, TraceJavaAssertions, false, \ 590 "Trace java language assertions") \ 591 \ 592 notproduct(bool, CheckAssertionStatusDirectives, false, \ 593 "temporary - see javaClasses.cpp") \ 594 \ 595 notproduct(bool, PrintMallocFree, false, \ 596 "Trace calls to C heap malloc/free allocation") \ 597 \ 598 notproduct(bool, PrintOopAddress, false, \ 599 "Always print the location of the oop") \ 600 \ 601 notproduct(bool, VerifyCodeCacheOften, false, \ 602 "Verify compiled-code cache often") \ 603 \ 604 develop(bool, ZapDeadCompiledLocals, false, \ 605 "Zap dead locals in compiler frames") \ 606 \ 607 notproduct(bool, ZapDeadLocalsOld, false, \ 608 "Zap dead locals (old version, zaps all frames when " \ 609 "entering the VM") \ 610 \ 611 notproduct(bool, CheckOopishValues, false, \ 612 "Warn if value contains oop ( requires ZapDeadLocals)") \ 613 \ 614 develop(bool, UseMallocOnly, false, \ 615 "use only malloc/free for allocation (no resource area/arena)") \ 616 \ 617 develop(bool, PrintMalloc, false, \ 618 "print all malloc/free calls") \ 619 \ 620 develop(bool, ZapResourceArea, trueInDebug, \ 621 "Zap freed resource/arena space with 0xABABABAB") \ 622 \ 623 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 624 "Zap freed VM handle space with 0xBCBCBCBC") \ 625 \ 626 develop(bool, ZapJNIHandleArea, trueInDebug, \ 627 "Zap freed JNI handle space with 0xFEFEFEFE") \ 628 \ 629 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 630 "Zap unused heap space with 0xBAADBABE") \ 631 \ 632 develop(bool, TraceZapUnusedHeapArea, false, \ 633 "Trace zapping of unused heap space") \ 634 \ 635 develop(bool, CheckZapUnusedHeapArea, false, \ 636 "Check zapping of unused heap space") \ 637 \ 638 develop(bool, ZapFillerObjects, trueInDebug, \ 639 "Zap filler objects with 0xDEAFBABE") \ 640 \ 641 develop(bool, PrintVMMessages, true, \ 642 "Print vm messages on console") \ 643 \ 644 product(bool, PrintGCApplicationConcurrentTime, false, \ 645 "Print the time the application has been running") \ 646 \ 647 product(bool, PrintGCApplicationStoppedTime, false, \ 648 "Print the time the application has been stopped") \ 649 \ 650 develop(bool, Verbose, false, \ 651 "Prints additional debugging information from other modes") \ 652 \ 653 develop(bool, PrintMiscellaneous, false, \ 654 "Prints uncategorized debugging information (requires +Verbose)") \ 655 \ 656 develop(bool, WizardMode, false, \ 657 "Prints much more debugging information") \ 658 \ 659 product(bool, ShowMessageBoxOnError, false, \ 660 "Keep process alive on VM fatal error") \ 661 \ 662 product_pd(bool, UseOSErrorReporting, \ 663 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 664 \ 665 product(bool, SuppressFatalErrorMessage, false, \ 666 "Do NO Fatal Error report [Avoid deadlock]") \ 667 \ 668 product(ccstrlist, OnError, "", \ 669 "Run user-defined commands on fatal error; see VMError.cpp " \ 670 "for examples") \ 671 \ 672 product(ccstrlist, OnOutOfMemoryError, "", \ 673 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 674 \ 675 manageable(bool, HeapDumpBeforeFullGC, false, \ 676 "Dump heap to file before any major stop-world GC") \ 677 \ 678 manageable(bool, HeapDumpAfterFullGC, false, \ 679 "Dump heap to file after any major stop-world GC") \ 680 \ 681 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 682 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 683 \ 684 manageable(ccstr, HeapDumpPath, NULL, \ 685 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 686 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 687 "in the working directory)") \ 688 \ 689 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 690 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 691 "when the heap usage is larger than this") \ 692 \ 693 develop(uintx, HeapDumpSegmentSize, 1*G, \ 694 "Approximate segment size when generating a segmented heap dump") \ 695 \ 696 develop(bool, BreakAtWarning, false, \ 697 "Execute breakpoint upon encountering VM warning") \ 698 \ 699 product_pd(bool, UseVectoredExceptions, \ 700 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 701 \ 702 develop(bool, TraceVMOperation, false, \ 703 "Trace vm operations") \ 704 \ 705 develop(bool, UseFakeTimers, false, \ 706 "Tells whether the VM should use system time or a fake timer") \ 707 \ 708 diagnostic(bool, LogCompilation, false, \ 709 "Log compilation activity in detail to hotspot.log or LogFile") \ 710 \ 711 product(bool, PrintCompilation, false, \ 712 "Print compilations") \ 713 \ 714 diagnostic(bool, TraceNMethodInstalls, false, \ 715 "Trace nmethod intallation") \ 716 \ 717 diagnostic(bool, TraceOSRBreakpoint, false, \ 718 "Trace OSR Breakpoint ") \ 719 \ 720 diagnostic(bool, TraceCompileTriggered, false, \ 721 "Trace compile triggered") \ 722 \ 723 diagnostic(bool, TraceTriggers, false, \ 724 "Trace triggers") \ 725 \ 726 product(bool, AlwaysRestoreFPU, false, \ 727 "Restore the FPU control word after every JNI call (expensive)") \ 728 \ 729 notproduct(bool, PrintCompilation2, false, \ 730 "Print additional statistics per compilation") \ 731 \ 732 diagnostic(bool, PrintAdapterHandlers, false, \ 733 "Print code generated for i2c/c2i adapters") \ 734 \ 735 diagnostic(bool, PrintAssembly, false, \ 736 "Print assembly code (using external disassembler.so)") \ 737 \ 738 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 739 "Options string passed to disassembler.so") \ 740 \ 741 diagnostic(bool, PrintNMethods, false, \ 742 "Print assembly code for nmethods when generated") \ 743 \ 744 diagnostic(bool, PrintNativeNMethods, false, \ 745 "Print assembly code for native nmethods when generated") \ 746 \ 747 develop(bool, PrintDebugInfo, false, \ 748 "Print debug information for all nmethods when generated") \ 749 \ 750 develop(bool, PrintRelocations, false, \ 751 "Print relocation information for all nmethods when generated") \ 752 \ 753 develop(bool, PrintDependencies, false, \ 754 "Print dependency information for all nmethods when generated") \ 755 \ 756 develop(bool, PrintExceptionHandlers, false, \ 757 "Print exception handler tables for all nmethods when generated") \ 758 \ 759 develop(bool, InterceptOSException, false, \ 760 "Starts debugger when an implicit OS (e.g., NULL) " \ 761 "exception happens") \ 762 \ 763 notproduct(bool, PrintCodeCache, false, \ 764 "Print the compiled_code cache when exiting") \ 765 \ 766 develop(bool, PrintCodeCache2, false, \ 767 "Print detailed info on the compiled_code cache when exiting") \ 768 \ 769 diagnostic(bool, PrintStubCode, false, \ 770 "Print generated stub code") \ 771 \ 772 product(bool, StackTraceInThrowable, true, \ 773 "Collect backtrace in throwable when exception happens") \ 774 \ 775 product(bool, OmitStackTraceInFastThrow, true, \ 776 "Omit backtraces for some 'hot' exceptions in optimized code") \ 777 \ 778 product(bool, ProfilerPrintByteCodeStatistics, false, \ 779 "Prints byte code statictics when dumping profiler output") \ 780 \ 781 product(bool, ProfilerRecordPC, false, \ 782 "Collects tick for each 16 byte interval of compiled code") \ 783 \ 784 product(bool, ProfileVM, false, \ 785 "Profiles ticks that fall within VM (either in the VM Thread " \ 786 "or VM code called through stubs)") \ 787 \ 788 product(bool, ProfileIntervals, false, \ 789 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 790 \ 791 notproduct(bool, ProfilerCheckIntervals, false, \ 792 "Collect and print info on spacing of profiler ticks") \ 793 \ 794 develop(bool, PrintJVMWarnings, false, \ 795 "Prints warnings for unimplemented JVM functions") \ 796 \ 797 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 798 "Prints warnings for stalled SpinLocks") \ 799 \ 800 develop(bool, InitializeJavaLangSystem, true, \ 801 "Initialize java.lang.System - turn off for individual " \ 802 "method debugging") \ 803 \ 804 develop(bool, InitializeJavaLangString, true, \ 805 "Initialize java.lang.String - turn off for individual " \ 806 "method debugging") \ 807 \ 808 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 809 "Initialize various error and exception classes - turn off for " \ 810 "individual method debugging") \ 811 \ 812 product(bool, RegisterFinalizersAtInit, true, \ 813 "Register finalizable objects at end of Object.<init> or " \ 814 "after allocation.") \ 815 \ 816 develop(bool, RegisterReferences, true, \ 817 "Tells whether the VM should register soft/weak/final/phantom " \ 818 "references") \ 819 \ 820 develop(bool, IgnoreRewrites, false, \ 821 "Supress rewrites of bytecodes in the oopmap generator. " \ 822 "This is unsafe!") \ 823 \ 824 develop(bool, PrintCodeCacheExtension, false, \ 825 "Print extension of code cache") \ 826 \ 827 develop(bool, UsePrivilegedStack, true, \ 828 "Enable the security JVM functions") \ 829 \ 830 develop(bool, IEEEPrecision, true, \ 831 "Enables IEEE precision (for INTEL only)") \ 832 \ 833 develop(bool, ProtectionDomainVerification, true, \ 834 "Verifies protection domain before resolution in system " \ 835 "dictionary") \ 836 \ 837 product(bool, ClassUnloading, true, \ 838 "Do unloading of classes") \ 839 \ 840 diagnostic(bool, LinkWellKnownClasses, false, \ 841 "Resolve a well known class as soon as its name is seen") \ 842 \ 843 develop(bool, DisableStartThread, false, \ 844 "Disable starting of additional Java threads " \ 845 "(for debugging only)") \ 846 \ 847 develop(bool, MemProfiling, false, \ 848 "Write memory usage profiling to log file") \ 849 \ 850 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 851 "Prints the system dictionary at exit") \ 852 \ 853 diagnostic(bool, UnsyncloadClass, false, \ 854 "Unstable: VM calls loadClass unsynchronized. Custom " \ 855 "class loader must call VM synchronized for findClass " \ 856 "and defineClass.") \ 857 \ 858 product(bool, AlwaysLockClassLoader, false, \ 859 "Require the VM to acquire the class loader lock before calling " \ 860 "loadClass() even for class loaders registering " \ 861 "as parallel capable. Default false. ") \ 862 \ 863 product(bool, AllowParallelDefineClass, false, \ 864 "Allow parallel defineClass requests for class loaders " \ 865 "registering as parallel capable. Default false") \ 866 \ 867 product(bool, MustCallLoadClassInternal, false, \ 868 "Call loadClassInternal() rather than loadClass().Default false") \ 869 \ 870 product_pd(bool, DontYieldALot, \ 871 "Throw away obvious excess yield calls (for SOLARIS only)") \ 872 \ 873 product_pd(bool, ConvertSleepToYield, \ 874 "Converts sleep(0) to thread yield " \ 875 "(may be off for SOLARIS to improve GUI)") \ 876 \ 877 product(bool, ConvertYieldToSleep, false, \ 878 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 879 "behavior (SOLARIS only)") \ 880 \ 881 product(bool, UseBoundThreads, true, \ 882 "Bind user level threads to kernel threads (for SOLARIS only)") \ 883 \ 884 develop(bool, UseDetachedThreads, true, \ 885 "Use detached threads that are recycled upon termination " \ 886 "(for SOLARIS only)") \ 887 \ 888 product(bool, UseLWPSynchronization, true, \ 889 "Use LWP-based instead of libthread-based synchronization " \ 890 "(SPARC only)") \ 891 \ 892 product(ccstr, SyncKnobs, NULL, \ 893 "(Unstable) Various monitor synchronization tunables") \ 894 \ 895 product(intx, EmitSync, 0, \ 896 "(Unsafe,Unstable) " \ 897 " Controls emission of inline sync fast-path code") \ 898 \ 899 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 900 \ 901 product(intx, Atomics, 0, \ 902 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 903 \ 904 product(intx, FenceInstruction, 0, \ 905 "(Unsafe,Unstable) Experimental") \ 906 \ 907 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 908 \ 909 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 910 \ 911 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 912 \ 913 product(intx, hashCode, 0, \ 914 "(Unstable) select hashCode generation algorithm" ) \ 915 \ 916 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 917 "(Unstable, Linux-specific)" \ 918 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 919 \ 920 product(bool, FilterSpuriousWakeups , true, \ 921 "Prevent spurious or premature wakeups from object.wait" \ 922 "(Solaris only)") \ 923 \ 924 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 925 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 926 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 927 \ 928 develop(bool, UsePthreads, false, \ 929 "Use pthread-based instead of libthread-based synchronization " \ 930 "(SPARC only)") \ 931 \ 932 product(bool, AdjustConcurrency, false, \ 933 "call thr_setconcurrency at thread create time to avoid " \ 934 "LWP starvation on MP systems (For Solaris Only)") \ 935 \ 936 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 937 "Should the system attempt to update the compiler file when " \ 938 "an error occurs?") \ 939 \ 940 product(bool, ReduceSignalUsage, false, \ 941 "Reduce the use of OS signals in Java and/or the VM") \ 942 \ 943 notproduct(bool, ValidateMarkSweep, false, \ 944 "Do extra validation during MarkSweep collection") \ 945 \ 946 notproduct(bool, RecordMarkSweepCompaction, false, \ 947 "Enable GC-to-GC recording and querying of compaction during " \ 948 "MarkSweep") \ 949 \ 950 develop_pd(bool, ShareVtableStubs, \ 951 "Share vtable stubs (smaller code but worse branch prediction") \ 952 \ 953 develop(bool, LoadLineNumberTables, true, \ 954 "Tells whether the class file parser loads line number tables") \ 955 \ 956 develop(bool, LoadLocalVariableTables, true, \ 957 "Tells whether the class file parser loads local variable tables")\ 958 \ 959 develop(bool, LoadLocalVariableTypeTables, true, \ 960 "Tells whether the class file parser loads local variable type tables")\ 961 \ 962 product(bool, AllowUserSignalHandlers, false, \ 963 "Do not complain if the application installs signal handlers " \ 964 "(Solaris & Linux only)") \ 965 \ 966 product(bool, UseSignalChaining, true, \ 967 "Use signal-chaining to invoke signal handlers installed " \ 968 "by the application (Solaris & Linux only)") \ 969 \ 970 product(bool, UseAltSigs, false, \ 971 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 972 "internal signals. (Solaris only)") \ 973 \ 974 product(bool, UseSpinning, false, \ 975 "Use spinning in monitor inflation and before entry") \ 976 \ 977 product(bool, PreSpinYield, false, \ 978 "Yield before inner spinning loop") \ 979 \ 980 product(bool, PostSpinYield, true, \ 981 "Yield after inner spinning loop") \ 982 \ 983 product(bool, AllowJNIEnvProxy, false, \ 984 "Allow JNIEnv proxies for jdbx") \ 985 \ 986 product(bool, JNIDetachReleasesMonitors, true, \ 987 "JNI DetachCurrentThread releases monitors owned by thread") \ 988 \ 989 product(bool, RestoreMXCSROnJNICalls, false, \ 990 "Restore MXCSR when returning from JNI calls") \ 991 \ 992 product(bool, CheckJNICalls, false, \ 993 "Verify all arguments to JNI calls") \ 994 \ 995 product(bool, UseFastJNIAccessors, true, \ 996 "Use optimized versions of Get<Primitive>Field") \ 997 \ 998 product(bool, EagerXrunInit, false, \ 999 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1000 " but not all -Xrun libraries may support the state of the VM at this time") \ 1001 \ 1002 product(bool, PreserveAllAnnotations, false, \ 1003 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1004 \ 1005 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1006 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1007 \ 1008 product(bool, LazyBootClassLoader, true, \ 1009 "Enable/disable lazy opening of boot class path entries") \ 1010 \ 1011 diagnostic(bool, UseIncDec, true, \ 1012 "Use INC, DEC instructions on x86") \ 1013 \ 1014 product(bool, UseNewLongLShift, false, \ 1015 "Use optimized bitwise shift left") \ 1016 \ 1017 product(bool, UseStoreImmI16, true, \ 1018 "Use store immediate 16-bits value instruction on x86") \ 1019 \ 1020 product(bool, UseAddressNop, false, \ 1021 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1022 \ 1023 product(bool, UseXmmLoadAndClearUpper, true, \ 1024 "Load low part of XMM register and clear upper part") \ 1025 \ 1026 product(bool, UseXmmRegToRegMoveAll, false, \ 1027 "Copy all XMM register bits when moving value between registers") \ 1028 \ 1029 product(bool, UseXmmI2D, false, \ 1030 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1031 \ 1032 product(bool, UseXmmI2F, false, \ 1033 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1034 \ 1035 product(bool, UseXMMForArrayCopy, false, \ 1036 "Use SSE2 MOVQ instruction for Arraycopy") \ 1037 \ 1038 product(bool, UseUnalignedLoadStores, false, \ 1039 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1040 \ 1041 product(intx, FieldsAllocationStyle, 1, \ 1042 "0 - type based with oops first, 1 - with oops last") \ 1043 \ 1044 product(bool, CompactFields, true, \ 1045 "Allocate nonstatic fields in gaps between previous fields") \ 1046 \ 1047 notproduct(bool, PrintCompactFieldsSavings, false, \ 1048 "Print how many words were saved with CompactFields") \ 1049 \ 1050 product(bool, UseBiasedLocking, true, \ 1051 "Enable biased locking in JVM") \ 1052 \ 1053 product(intx, BiasedLockingStartupDelay, 4000, \ 1054 "Number of milliseconds to wait before enabling biased locking") \ 1055 \ 1056 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1057 "Print statistics of biased locking in JVM") \ 1058 \ 1059 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1060 "Threshold of number of revocations per type to try to " \ 1061 "rebias all objects in the heap of that type") \ 1062 \ 1063 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1064 "Threshold of number of revocations per type to permanently " \ 1065 "revoke biases of all objects in the heap of that type") \ 1066 \ 1067 product(intx, BiasedLockingDecayTime, 25000, \ 1068 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1069 "type after previous bulk rebias") \ 1070 \ 1071 /* tracing */ \ 1072 \ 1073 notproduct(bool, TraceRuntimeCalls, false, \ 1074 "Trace run-time calls") \ 1075 \ 1076 develop(bool, TraceJNICalls, false, \ 1077 "Trace JNI calls") \ 1078 \ 1079 notproduct(bool, TraceJVMCalls, false, \ 1080 "Trace JVM calls") \ 1081 \ 1082 product(ccstr, TraceJVMTI, NULL, \ 1083 "Trace flags for JVMTI functions and events") \ 1084 \ 1085 /* This option can change an EMCP method into an obsolete method. */ \ 1086 /* This can affect tests that except specific methods to be EMCP. */ \ 1087 /* This option should be used with caution. */ \ 1088 product(bool, StressLdcRewrite, false, \ 1089 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1090 \ 1091 product(intx, TraceRedefineClasses, 0, \ 1092 "Trace level for JVMTI RedefineClasses") \ 1093 \ 1094 /* change to false by default sometime after Mustang */ \ 1095 product(bool, VerifyMergedCPBytecodes, true, \ 1096 "Verify bytecodes after RedefineClasses constant pool merging") \ 1097 \ 1098 develop(bool, TraceJNIHandleAllocation, false, \ 1099 "Trace allocation/deallocation of JNI handle blocks") \ 1100 \ 1101 develop(bool, TraceThreadEvents, false, \ 1102 "Trace all thread events") \ 1103 \ 1104 develop(bool, TraceBytecodes, false, \ 1105 "Trace bytecode execution") \ 1106 \ 1107 develop(bool, TraceClassInitialization, false, \ 1108 "Trace class initialization") \ 1109 \ 1110 develop(bool, TraceExceptions, false, \ 1111 "Trace exceptions") \ 1112 \ 1113 develop(bool, TraceICs, false, \ 1114 "Trace inline cache changes") \ 1115 \ 1116 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1117 "Trace method invocation counter overflow") \ 1118 \ 1119 develop(bool, TraceInlineCacheClearing, false, \ 1120 "Trace clearing of inline caches in nmethods") \ 1121 \ 1122 develop(bool, TraceDependencies, false, \ 1123 "Trace dependencies") \ 1124 \ 1125 develop(bool, VerifyDependencies, trueInDebug, \ 1126 "Exercise and verify the compilation dependency mechanism") \ 1127 \ 1128 develop(bool, TraceNewOopMapGeneration, false, \ 1129 "Trace OopMapGeneration") \ 1130 \ 1131 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1132 "Trace OopMapGeneration: print detailed cell states") \ 1133 \ 1134 develop(bool, TimeOopMap, false, \ 1135 "Time calls to GenerateOopMap::compute_map() in sum") \ 1136 \ 1137 develop(bool, TimeOopMap2, false, \ 1138 "Time calls to GenerateOopMap::compute_map() individually") \ 1139 \ 1140 develop(bool, TraceMonitorMismatch, false, \ 1141 "Trace monitor matching failures during OopMapGeneration") \ 1142 \ 1143 develop(bool, TraceOopMapRewrites, false, \ 1144 "Trace rewritting of method oops during oop map generation") \ 1145 \ 1146 develop(bool, TraceSafepoint, false, \ 1147 "Trace safepoint operations") \ 1148 \ 1149 develop(bool, TraceICBuffer, false, \ 1150 "Trace usage of IC buffer") \ 1151 \ 1152 develop(bool, TraceCompiledIC, false, \ 1153 "Trace changes of compiled IC") \ 1154 \ 1155 notproduct(bool, TraceZapDeadLocals, false, \ 1156 "Trace zapping dead locals") \ 1157 \ 1158 develop(bool, TraceStartupTime, false, \ 1159 "Trace setup time") \ 1160 \ 1161 develop(bool, TraceHPI, false, \ 1162 "Trace Host Porting Interface (HPI)") \ 1163 \ 1164 product(ccstr, HPILibPath, NULL, \ 1165 "Specify alternate path to HPI library") \ 1166 \ 1167 develop(bool, TraceProtectionDomainVerification, false, \ 1168 "Trace protection domain verifcation") \ 1169 \ 1170 develop(bool, TraceClearedExceptions, false, \ 1171 "Prints when an exception is forcibly cleared") \ 1172 \ 1173 product(bool, TraceClassResolution, false, \ 1174 "Trace all constant pool resolutions (for debugging)") \ 1175 \ 1176 product(bool, TraceBiasedLocking, false, \ 1177 "Trace biased locking in JVM") \ 1178 \ 1179 product(bool, TraceMonitorInflation, false, \ 1180 "Trace monitor inflation in JVM") \ 1181 \ 1182 /* assembler */ \ 1183 product(bool, Use486InstrsOnly, false, \ 1184 "Use 80486 Compliant instruction subset") \ 1185 \ 1186 /* gc */ \ 1187 \ 1188 product(bool, UseSerialGC, false, \ 1189 "Use the serial garbage collector") \ 1190 \ 1191 experimental(bool, UseG1GC, false, \ 1192 "Use the Garbage-First garbage collector") \ 1193 \ 1194 product(bool, UseParallelGC, false, \ 1195 "Use the Parallel Scavenge garbage collector") \ 1196 \ 1197 product(bool, UseParallelOldGC, false, \ 1198 "Use the Parallel Old garbage collector") \ 1199 \ 1200 product(bool, UseParallelOldGCCompacting, true, \ 1201 "In the Parallel Old garbage collector use parallel compaction") \ 1202 \ 1203 product(bool, UseParallelDensePrefixUpdate, true, \ 1204 "In the Parallel Old garbage collector use parallel dense" \ 1205 " prefix update") \ 1206 \ 1207 product(uintx, HeapMaximumCompactionInterval, 20, \ 1208 "How often should we maximally compact the heap (not allowing " \ 1209 "any dead space)") \ 1210 \ 1211 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1212 "The collection count for the first maximum compaction") \ 1213 \ 1214 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1215 "In the Parallel Old garbage collector maximum compaction for " \ 1216 "a system GC") \ 1217 \ 1218 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1219 "The mean used by the par compact dead wood" \ 1220 "limiter (a number between 0-100).") \ 1221 \ 1222 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1223 "The standard deviation used by the par compact dead wood" \ 1224 "limiter (a number between 0-100).") \ 1225 \ 1226 product(bool, UseParallelOldGCDensePrefix, true, \ 1227 "Use a dense prefix with the Parallel Old garbage collector") \ 1228 \ 1229 product(uintx, ParallelGCThreads, 0, \ 1230 "Number of parallel threads parallel gc will use") \ 1231 \ 1232 product(uintx, ParallelCMSThreads, 0, \ 1233 "Max number of threads CMS will use for concurrent work") \ 1234 \ 1235 develop(bool, ParallelOldGCSplitALot, false, \ 1236 "Provoke splitting (copying data from a young gen space to" \ 1237 "multiple destination spaces)") \ 1238 \ 1239 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1240 "How often to provoke splitting a young gen space") \ 1241 \ 1242 develop(bool, TraceRegionTasksQueuing, false, \ 1243 "Trace the queuing of the region tasks") \ 1244 \ 1245 product(uintx, ParallelMarkingThreads, 0, \ 1246 "Number of marking threads concurrent gc will use") \ 1247 \ 1248 product(uintx, YoungPLABSize, 4096, \ 1249 "Size of young gen promotion labs (in HeapWords)") \ 1250 \ 1251 product(uintx, OldPLABSize, 1024, \ 1252 "Size of old gen promotion labs (in HeapWords)") \ 1253 \ 1254 product(uintx, GCTaskTimeStampEntries, 200, \ 1255 "Number of time stamp entries per gc worker thread") \ 1256 \ 1257 product(bool, AlwaysTenure, false, \ 1258 "Always tenure objects in eden. (ParallelGC only)") \ 1259 \ 1260 product(bool, NeverTenure, false, \ 1261 "Never tenure objects in eden, May tenure on overflow" \ 1262 " (ParallelGC only)") \ 1263 \ 1264 product(bool, ScavengeBeforeFullGC, true, \ 1265 "Scavenge youngest generation before each full GC," \ 1266 " used with UseParallelGC") \ 1267 \ 1268 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1269 "Allow scavenges to occur when to_space contains objects.") \ 1270 \ 1271 product(bool, UseConcMarkSweepGC, false, \ 1272 "Use Concurrent Mark-Sweep GC in the old generation") \ 1273 \ 1274 product(bool, ExplicitGCInvokesConcurrent, false, \ 1275 "A System.gc() request invokes a concurrent collection;" \ 1276 " (effective only when UseConcMarkSweepGC)") \ 1277 \ 1278 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1279 "A System.gc() request invokes a concurrent collection and" \ 1280 " also unloads classes during such a concurrent gc cycle " \ 1281 " (effective only when UseConcMarkSweepGC)") \ 1282 \ 1283 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1284 "Use Adaptive Free Lists in the CMS generation") \ 1285 \ 1286 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1287 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1288 \ 1289 develop(bool, RotateCMSCollectionTypes, false, \ 1290 "Rotate the CMS collections among concurrent and STW") \ 1291 \ 1292 product(bool, UseCMSBestFit, true, \ 1293 "Use CMS best fit allocation strategy") \ 1294 \ 1295 product(bool, UseCMSCollectionPassing, true, \ 1296 "Use passing of collection from background to foreground") \ 1297 \ 1298 product(bool, UseParNewGC, false, \ 1299 "Use parallel threads in the new generation.") \ 1300 \ 1301 product(bool, ParallelGCVerbose, false, \ 1302 "Verbose output for parallel GC.") \ 1303 \ 1304 product(intx, ParallelGCBufferWastePct, 10, \ 1305 "wasted fraction of parallel allocation buffer.") \ 1306 \ 1307 product(bool, ParallelGCRetainPLAB, true, \ 1308 "Retain parallel allocation buffers across scavenges.") \ 1309 \ 1310 product(intx, TargetPLABWastePct, 10, \ 1311 "target wasted space in last buffer as pct of overall allocation")\ 1312 \ 1313 product(uintx, PLABWeight, 75, \ 1314 "Percentage (0-100) used to weight the current sample when" \ 1315 "computing exponentially decaying average for ResizePLAB.") \ 1316 \ 1317 product(bool, ResizePLAB, true, \ 1318 "Dynamically resize (survivor space) promotion labs") \ 1319 \ 1320 product(bool, PrintPLAB, false, \ 1321 "Print (survivor space) promotion labs sizing decisions") \ 1322 \ 1323 product(intx, ParGCArrayScanChunk, 50, \ 1324 "Scan a subset and push remainder, if array is bigger than this") \ 1325 \ 1326 product(bool, ParGCUseLocalOverflow, false, \ 1327 "Instead of a global overflow list, use local overflow stacks") \ 1328 \ 1329 product(bool, ParGCTrimOverflow, true, \ 1330 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1331 \ 1332 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1333 "Whether we should simulate work queue overflow in ParNew") \ 1334 \ 1335 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1336 "An `interval' counter that determines how frequently" \ 1337 " we simulate overflow; a smaller number increases frequency") \ 1338 \ 1339 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1340 "The desired number of objects to claim from the overflow list") \ 1341 \ 1342 product(uintx, CMSParPromoteBlocksToClaim, 50, \ 1343 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1344 "parallel GC.") \ 1345 \ 1346 product(bool, AlwaysPreTouch, false, \ 1347 "It forces all freshly committed pages to be pre-touched.") \ 1348 \ 1349 product(bool, CMSUseOldDefaults, false, \ 1350 "A flag temporarily introduced to allow reverting to some older" \ 1351 "default settings; older as of 6.0 ") \ 1352 \ 1353 product(intx, CMSYoungGenPerWorker, 16*M, \ 1354 "The amount of young gen chosen by default per GC worker " \ 1355 "thread available ") \ 1356 \ 1357 product(bool, GCOverheadReporting, false, \ 1358 "Enables the GC overhead reporting facility") \ 1359 \ 1360 product(intx, GCOverheadReportingPeriodMS, 100, \ 1361 "Reporting period for conc GC overhead reporting, in ms ") \ 1362 \ 1363 product(bool, CMSIncrementalMode, false, \ 1364 "Whether CMS GC should operate in \"incremental\" mode") \ 1365 \ 1366 product(uintx, CMSIncrementalDutyCycle, 10, \ 1367 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1368 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1369 "value") \ 1370 \ 1371 product(bool, CMSIncrementalPacing, true, \ 1372 "Whether the CMS incremental mode duty cycle should be " \ 1373 "automatically adjusted") \ 1374 \ 1375 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1376 "Lower bound on the duty cycle when CMSIncrementalPacing is" \ 1377 "enabled (a percentage, 0-100).") \ 1378 \ 1379 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1380 "Percentage (0-100) used to add conservatism when computing the" \ 1381 "duty cycle.") \ 1382 \ 1383 product(uintx, CMSIncrementalOffset, 0, \ 1384 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1385 "is shifted to the right within the period between young GCs") \ 1386 \ 1387 product(uintx, CMSExpAvgFactor, 25, \ 1388 "Percentage (0-100) used to weight the current sample when" \ 1389 "computing exponential averages for CMS statistics.") \ 1390 \ 1391 product(uintx, CMS_FLSWeight, 50, \ 1392 "Percentage (0-100) used to weight the current sample when" \ 1393 "computing exponentially decating averages for CMS FLS statistics.") \ 1394 \ 1395 product(uintx, CMS_FLSPadding, 2, \ 1396 "The multiple of deviation from mean to use for buffering" \ 1397 "against volatility in free list demand.") \ 1398 \ 1399 product(uintx, FLSCoalescePolicy, 2, \ 1400 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1401 \ 1402 product(uintx, CMS_SweepWeight, 50, \ 1403 "Percentage (0-100) used to weight the current sample when" \ 1404 "computing exponentially decaying average for inter-sweep duration.") \ 1405 \ 1406 product(uintx, CMS_SweepPadding, 2, \ 1407 "The multiple of deviation from mean to use for buffering" \ 1408 "against volatility in inter-sweep duration.") \ 1409 \ 1410 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1411 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1412 " duration exceeds this threhold in milliseconds") \ 1413 \ 1414 develop(bool, CMSTraceIncrementalMode, false, \ 1415 "Trace CMS incremental mode") \ 1416 \ 1417 develop(bool, CMSTraceIncrementalPacing, false, \ 1418 "Trace CMS incremental mode pacing computation") \ 1419 \ 1420 develop(bool, CMSTraceThreadState, false, \ 1421 "Trace the CMS thread state (enable the trace_state() method)") \ 1422 \ 1423 product(bool, CMSClassUnloadingEnabled, false, \ 1424 "Whether class unloading enabled when using CMS GC") \ 1425 \ 1426 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1427 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1428 " for which classes may not be unloaded") \ 1429 \ 1430 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1431 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1432 \ 1433 product(bool, UseCMSCompactAtFullCollection, true, \ 1434 "Use mark sweep compact at full collections") \ 1435 \ 1436 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1437 "Number of CMS full collection done before compaction if > 0") \ 1438 \ 1439 develop(intx, CMSDictionaryChoice, 0, \ 1440 "Use BinaryTreeDictionary as default in the CMS generation") \ 1441 \ 1442 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1443 "Replenish and indexed free list with this number of chunks") \ 1444 \ 1445 product(bool, CMSLoopWarn, false, \ 1446 "Warn in case of excessive CMS looping") \ 1447 \ 1448 develop(bool, CMSOverflowEarlyRestoration, false, \ 1449 "Whether preserved marks should be restored early") \ 1450 \ 1451 product(uintx, CMSMarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1452 "Size of CMS marking stack") \ 1453 \ 1454 product(uintx, CMSMarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1455 "Max size of CMS marking stack") \ 1456 \ 1457 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1458 "Whether we should simulate frequent marking stack / work queue" \ 1459 " overflow") \ 1460 \ 1461 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1462 "An `interval' counter that determines how frequently" \ 1463 " we simulate overflow; a smaller number increases frequency") \ 1464 \ 1465 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1466 "(Temporary, subject to experimentation)" \ 1467 "Maximum number of abortable preclean iterations, if > 0") \ 1468 \ 1469 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1470 "(Temporary, subject to experimentation)" \ 1471 "Maximum time in abortable preclean in ms") \ 1472 \ 1473 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1474 "(Temporary, subject to experimentation)" \ 1475 "Nominal minimum work per abortable preclean iteration") \ 1476 \ 1477 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1478 "(Temporary, subject to experimentation)" \ 1479 " Time that we sleep between iterations when not given" \ 1480 " enough work per iteration") \ 1481 \ 1482 product(uintx, CMSRescanMultiple, 32, \ 1483 "Size (in cards) of CMS parallel rescan task") \ 1484 \ 1485 product(uintx, CMSConcMarkMultiple, 32, \ 1486 "Size (in cards) of CMS concurrent MT marking task") \ 1487 \ 1488 product(uintx, CMSRevisitStackSize, 1*M, \ 1489 "Size of CMS KlassKlass revisit stack") \ 1490 \ 1491 product(bool, CMSAbortSemantics, false, \ 1492 "Whether abort-on-overflow semantics is implemented") \ 1493 \ 1494 product(bool, CMSParallelRemarkEnabled, true, \ 1495 "Whether parallel remark enabled (only if ParNewGC)") \ 1496 \ 1497 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1498 "Whether parallel remark of survivor space" \ 1499 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1500 \ 1501 product(bool, CMSPLABRecordAlways, true, \ 1502 "Whether to always record survivor space PLAB bdries" \ 1503 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1504 \ 1505 product(bool, CMSConcurrentMTEnabled, true, \ 1506 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1507 \ 1508 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1509 "Whether concurrent precleaning enabled in perm gen" \ 1510 " (effective only when CMSPrecleaningEnabled is true)") \ 1511 \ 1512 product(bool, CMSPrecleaningEnabled, true, \ 1513 "Whether concurrent precleaning enabled") \ 1514 \ 1515 product(uintx, CMSPrecleanIter, 3, \ 1516 "Maximum number of precleaning iteration passes") \ 1517 \ 1518 product(uintx, CMSPrecleanNumerator, 2, \ 1519 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1520 " ratio") \ 1521 \ 1522 product(uintx, CMSPrecleanDenominator, 3, \ 1523 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1524 " ratio") \ 1525 \ 1526 product(bool, CMSPrecleanRefLists1, true, \ 1527 "Preclean ref lists during (initial) preclean phase") \ 1528 \ 1529 product(bool, CMSPrecleanRefLists2, false, \ 1530 "Preclean ref lists during abortable preclean phase") \ 1531 \ 1532 product(bool, CMSPrecleanSurvivors1, false, \ 1533 "Preclean survivors during (initial) preclean phase") \ 1534 \ 1535 product(bool, CMSPrecleanSurvivors2, true, \ 1536 "Preclean survivors during abortable preclean phase") \ 1537 \ 1538 product(uintx, CMSPrecleanThreshold, 1000, \ 1539 "Don't re-iterate if #dirty cards less than this") \ 1540 \ 1541 product(bool, CMSCleanOnEnter, true, \ 1542 "Clean-on-enter optimization for reducing number of dirty cards") \ 1543 \ 1544 product(uintx, CMSRemarkVerifyVariant, 1, \ 1545 "Choose variant (1,2) of verification following remark") \ 1546 \ 1547 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1548 "If Eden used is below this value, don't try to schedule remark") \ 1549 \ 1550 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1551 "The Eden occupancy % at which to try and schedule remark pause") \ 1552 \ 1553 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1554 "Start sampling Eden top at least before yg occupancy reaches" \ 1555 " 1/<ratio> of the size at which we plan to schedule remark") \ 1556 \ 1557 product(uintx, CMSSamplingGrain, 16*K, \ 1558 "The minimum distance between eden samples for CMS (see above)") \ 1559 \ 1560 product(bool, CMSScavengeBeforeRemark, false, \ 1561 "Attempt scavenge before the CMS remark step") \ 1562 \ 1563 develop(bool, CMSTraceSweeper, false, \ 1564 "Trace some actions of the CMS sweeper") \ 1565 \ 1566 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1567 "Don't drain below this size per parallel worker/thief") \ 1568 \ 1569 product(intx, CMSWaitDuration, 2000, \ 1570 "Time in milliseconds that CMS thread waits for young GC") \ 1571 \ 1572 product(bool, CMSYield, true, \ 1573 "Yield between steps of concurrent mark & sweep") \ 1574 \ 1575 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1576 "Bitmap operations should process at most this many bits" \ 1577 "between yields") \ 1578 \ 1579 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1580 "Verify that all refs across the FLS boundary " \ 1581 " are to valid objects") \ 1582 \ 1583 diagnostic(bool, FLSVerifyLists, false, \ 1584 "Do lots of (expensive) FreeListSpace verification") \ 1585 \ 1586 diagnostic(bool, FLSVerifyIndexTable, false, \ 1587 "Do lots of (expensive) FLS index table verification") \ 1588 \ 1589 develop(bool, FLSVerifyDictionary, false, \ 1590 "Do lots of (expensive) FLS dictionary verification") \ 1591 \ 1592 develop(bool, VerifyBlockOffsetArray, false, \ 1593 "Do (expensive!) block offset array verification") \ 1594 \ 1595 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1596 "Maintain _unallocated_block in BlockOffsetArray" \ 1597 " (currently applicable only to CMS collector)") \ 1598 \ 1599 develop(bool, TraceCMSState, false, \ 1600 "Trace the state of the CMS collection") \ 1601 \ 1602 product(intx, RefDiscoveryPolicy, 0, \ 1603 "Whether reference-based(0) or referent-based(1)") \ 1604 \ 1605 product(bool, ParallelRefProcEnabled, false, \ 1606 "Enable parallel reference processing whenever possible") \ 1607 \ 1608 product(bool, ParallelRefProcBalancingEnabled, true, \ 1609 "Enable balancing of reference processing queues") \ 1610 \ 1611 product(intx, CMSTriggerRatio, 80, \ 1612 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1613 " allocated before a CMS collection cycle commences") \ 1614 \ 1615 product(intx, CMSTriggerPermRatio, 80, \ 1616 "Percentage of MinHeapFreeRatio in the CMS perm generation that" \ 1617 " is allocated before a CMS collection cycle commences, that " \ 1618 " also collects the perm generation") \ 1619 \ 1620 product(uintx, CMSBootstrapOccupancy, 50, \ 1621 "Percentage CMS generation occupancy at which to " \ 1622 " initiate CMS collection for bootstrapping collection stats") \ 1623 \ 1624 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1625 "Percentage CMS generation occupancy to start a CMS collection " \ 1626 " cycle (A negative value means that CMSTriggerRatio is used)") \ 1627 \ 1628 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1629 "Percentage CMS perm generation occupancy to start a CMScollection"\ 1630 " cycle (A negative value means that CMSTriggerPermRatio is used)")\ 1631 \ 1632 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1633 "Only use occupancy as a crierion for starting a CMS collection") \ 1634 \ 1635 product(intx, CMSIsTooFullPercentage, 98, \ 1636 "An absolute ceiling above which CMS will always consider the" \ 1637 " perm gen ripe for collection") \ 1638 \ 1639 develop(bool, CMSTestInFreeList, false, \ 1640 "Check if the coalesced range is already in the " \ 1641 "free lists as claimed.") \ 1642 \ 1643 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1644 "Check that all the garbage collected was returned to the " \ 1645 "free lists.") \ 1646 \ 1647 notproduct(bool, ScavengeALot, false, \ 1648 "Force scavenge at every Nth exit from the runtime system " \ 1649 "(N=ScavengeALotInterval)") \ 1650 \ 1651 develop(bool, FullGCALot, false, \ 1652 "Force full gc at every Nth exit from the runtime system " \ 1653 "(N=FullGCALotInterval)") \ 1654 \ 1655 notproduct(bool, GCALotAtAllSafepoints, false, \ 1656 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1657 \ 1658 product(bool, HandlePromotionFailure, true, \ 1659 "The youngest generation collection does not require" \ 1660 " a guarantee of full promotion of all live objects.") \ 1661 \ 1662 notproduct(bool, PromotionFailureALot, false, \ 1663 "Use promotion failure handling on every youngest generation " \ 1664 "collection") \ 1665 \ 1666 develop(uintx, PromotionFailureALotCount, 1000, \ 1667 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1668 "refill attempts (ParNew) or promotion attempts " \ 1669 "(other young collectors) ") \ 1670 \ 1671 develop(uintx, PromotionFailureALotInterval, 5, \ 1672 "Total collections between promotion failures alot") \ 1673 \ 1674 develop(intx, WorkStealingSleepMillis, 1, \ 1675 "Sleep time when sleep is used for yields") \ 1676 \ 1677 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1678 "Number of yields before a sleep is done during workstealing") \ 1679 \ 1680 develop(uintx, WorkStealingHardSpins, 4096, \ 1681 "Number of iterations in a spin loop between checks on " \ 1682 "time out of hard spin") \ 1683 \ 1684 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1685 "Ratio of hard spins to calls to yield") \ 1686 \ 1687 product(uintx, PreserveMarkStackSize, 1024, \ 1688 "Size for stack used in promotion failure handling") \ 1689 \ 1690 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1691 \ 1692 product_pd(bool, ResizeTLAB, \ 1693 "Dynamically resize tlab size for threads") \ 1694 \ 1695 product(bool, ZeroTLAB, false, \ 1696 "Zero out the newly created TLAB") \ 1697 \ 1698 product(bool, FastTLABRefill, true, \ 1699 "Use fast TLAB refill code") \ 1700 \ 1701 product(bool, PrintTLAB, false, \ 1702 "Print various TLAB related information") \ 1703 \ 1704 product(bool, TLABStats, true, \ 1705 "Print various TLAB related information") \ 1706 \ 1707 product_pd(bool, NeverActAsServerClassMachine, \ 1708 "Never act like a server-class machine") \ 1709 \ 1710 product(bool, AlwaysActAsServerClassMachine, false, \ 1711 "Always act like a server-class machine") \ 1712 \ 1713 product_pd(uintx, DefaultMaxRAM, \ 1714 "Maximum real memory size for setting server class heap size") \ 1715 \ 1716 product(uintx, DefaultMaxRAMFraction, 4, \ 1717 "Fraction (1/n) of real memory used for server class max heap") \ 1718 \ 1719 product(uintx, DefaultInitialRAMFraction, 64, \ 1720 "Fraction (1/n) of real memory used for server class initial heap") \ 1721 \ 1722 product(bool, UseAutoGCSelectPolicy, false, \ 1723 "Use automatic collection selection policy") \ 1724 \ 1725 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1726 "Automatic GC selection pause threshhold in ms") \ 1727 \ 1728 product(bool, UseAdaptiveSizePolicy, true, \ 1729 "Use adaptive generation sizing policies") \ 1730 \ 1731 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1732 "Use adaptive survivor sizing policies") \ 1733 \ 1734 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1735 "Use adaptive young-old sizing policies at minor collections") \ 1736 \ 1737 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1738 "Use adaptive young-old sizing policies at major collections") \ 1739 \ 1740 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1741 "Use statistics from System.GC for adaptive size policy") \ 1742 \ 1743 product(bool, UseAdaptiveGCBoundary, false, \ 1744 "Allow young-old boundary to move") \ 1745 \ 1746 develop(bool, TraceAdaptiveGCBoundary, false, \ 1747 "Trace young-old boundary moves") \ 1748 \ 1749 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1750 "Resize the virtual spaces of the young or old generations") \ 1751 \ 1752 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1753 "Policy for changeing generation size for throughput goals") \ 1754 \ 1755 product(uintx, AdaptiveSizePausePolicy, 0, \ 1756 "Policy for changing generation size for pause goals") \ 1757 \ 1758 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1759 "Adjust tenured generation to achive a minor pause goal") \ 1760 \ 1761 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1762 "Adjust young generation to achive a major pause goal") \ 1763 \ 1764 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1765 "Number of steps where heuristics is used before data is used") \ 1766 \ 1767 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1768 "Number of collections before the adaptive sizing is started") \ 1769 \ 1770 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1771 "Collecton interval for printing information, zero => never") \ 1772 \ 1773 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1774 "Use adaptive minimum footprint as a goal") \ 1775 \ 1776 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1777 "Weight given to exponential resizing, between 0 and 100") \ 1778 \ 1779 product(uintx, AdaptiveTimeWeight, 25, \ 1780 "Weight given to time in adaptive policy, between 0 and 100") \ 1781 \ 1782 product(uintx, PausePadding, 1, \ 1783 "How much buffer to keep for pause time") \ 1784 \ 1785 product(uintx, PromotedPadding, 3, \ 1786 "How much buffer to keep for promotion failure") \ 1787 \ 1788 product(uintx, SurvivorPadding, 3, \ 1789 "How much buffer to keep for survivor overflow") \ 1790 \ 1791 product(uintx, AdaptivePermSizeWeight, 20, \ 1792 "Weight for perm gen exponential resizing, between 0 and 100") \ 1793 \ 1794 product(uintx, PermGenPadding, 3, \ 1795 "How much buffer to keep for perm gen sizing") \ 1796 \ 1797 product(uintx, ThresholdTolerance, 10, \ 1798 "Allowed collection cost difference between generations") \ 1799 \ 1800 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1801 "If collection costs are within margin, reduce both by full delta") \ 1802 \ 1803 product(uintx, YoungGenerationSizeIncrement, 20, \ 1804 "Adaptive size percentage change in young generation") \ 1805 \ 1806 product(uintx, YoungGenerationSizeSupplement, 80, \ 1807 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1808 \ 1809 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1810 "Decay factor to YoungedGenerationSizeSupplement") \ 1811 \ 1812 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1813 "Adaptive size percentage change in tenured generation") \ 1814 \ 1815 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1816 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1817 \ 1818 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1819 "Decay factor to TenuredGenerationSizeIncrement") \ 1820 \ 1821 product(uintx, MaxGCPauseMillis, max_uintx, \ 1822 "Adaptive size policy maximum GC pause time goal in msec") \ 1823 \ 1824 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1825 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1826 \ 1827 product(uintx, GCTimeRatio, 99, \ 1828 "Adaptive size policy application time to GC time ratio") \ 1829 \ 1830 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1831 "Adaptive size scale down factor for shrinking") \ 1832 \ 1833 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1834 "Adaptive size decays the major cost for long major intervals") \ 1835 \ 1836 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1837 "Time scale over which major costs decay") \ 1838 \ 1839 product(uintx, MinSurvivorRatio, 3, \ 1840 "Minimum ratio of young generation/survivor space size") \ 1841 \ 1842 product(uintx, InitialSurvivorRatio, 8, \ 1843 "Initial ratio of eden/survivor space size") \ 1844 \ 1845 product(uintx, BaseFootPrintEstimate, 256*M, \ 1846 "Estimate of footprint other than Java Heap") \ 1847 \ 1848 product(bool, UseGCOverheadLimit, true, \ 1849 "Use policy to limit of proportion of time spent in GC " \ 1850 "before an OutOfMemory error is thrown") \ 1851 \ 1852 product(uintx, GCTimeLimit, 98, \ 1853 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1854 "error is thrown (used with GCHeapFreeLimit)") \ 1855 \ 1856 product(uintx, GCHeapFreeLimit, 2, \ 1857 "Minimum percentage of free space after a full GC before an " \ 1858 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1859 \ 1860 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 1861 "Number of consecutive collections before gc time limit fires") \ 1862 \ 1863 product(bool, PrintAdaptiveSizePolicy, false, \ 1864 "Print information about AdaptiveSizePolicy") \ 1865 \ 1866 product(intx, PrefetchCopyIntervalInBytes, -1, \ 1867 "How far ahead to prefetch destination area (<= 0 means off)") \ 1868 \ 1869 product(intx, PrefetchScanIntervalInBytes, -1, \ 1870 "How far ahead to prefetch scan area (<= 0 means off)") \ 1871 \ 1872 product(intx, PrefetchFieldsAhead, -1, \ 1873 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 1874 \ 1875 develop(bool, UsePrefetchQueue, true, \ 1876 "Use the prefetch queue during PS promotion") \ 1877 \ 1878 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 1879 "Verify system before exiting") \ 1880 \ 1881 diagnostic(bool, VerifyBeforeGC, false, \ 1882 "Verify memory system before GC") \ 1883 \ 1884 diagnostic(bool, VerifyAfterGC, false, \ 1885 "Verify memory system after GC") \ 1886 \ 1887 diagnostic(bool, VerifyDuringGC, false, \ 1888 "Verify memory system during GC (between phases)") \ 1889 \ 1890 diagnostic(bool, GCParallelVerificationEnabled, true, \ 1891 "Enable parallel memory system verification") \ 1892 \ 1893 diagnostic(bool, VerifyRememberedSets, false, \ 1894 "Verify GC remembered sets") \ 1895 \ 1896 diagnostic(bool, VerifyObjectStartArray, true, \ 1897 "Verify GC object start array if verify before/after") \ 1898 \ 1899 product(bool, DisableExplicitGC, false, \ 1900 "Tells whether calling System.gc() does a full GC") \ 1901 \ 1902 notproduct(bool, CheckMemoryInitialization, false, \ 1903 "Checks memory initialization") \ 1904 \ 1905 product(bool, CollectGen0First, false, \ 1906 "Collect youngest generation before each full GC") \ 1907 \ 1908 diagnostic(bool, BindCMSThreadToCPU, false, \ 1909 "Bind CMS Thread to CPU if possible") \ 1910 \ 1911 diagnostic(uintx, CPUForCMSThread, 0, \ 1912 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 1913 \ 1914 product(bool, BindGCTaskThreadsToCPUs, false, \ 1915 "Bind GCTaskThreads to CPUs if possible") \ 1916 \ 1917 product(bool, UseGCTaskAffinity, false, \ 1918 "Use worker affinity when asking for GCTasks") \ 1919 \ 1920 product(uintx, ProcessDistributionStride, 4, \ 1921 "Stride through processors when distributing processes") \ 1922 \ 1923 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 1924 "number of times the coordinator GC thread will sleep while " \ 1925 "yielding before giving up and resuming GC") \ 1926 \ 1927 product(uintx, CMSYieldSleepCount, 0, \ 1928 "number of times a GC thread (minus the coordinator) " \ 1929 "will sleep while yielding before giving up and resuming GC") \ 1930 \ 1931 notproduct(bool, PrintFlagsFinal, false, \ 1932 "Print all command line flags after argument processing") \ 1933 \ 1934 /* gc tracing */ \ 1935 manageable(bool, PrintGC, false, \ 1936 "Print message at garbage collect") \ 1937 \ 1938 manageable(bool, PrintGCDetails, false, \ 1939 "Print more details at garbage collect") \ 1940 \ 1941 manageable(bool, PrintGCDateStamps, false, \ 1942 "Print date stamps at garbage collect") \ 1943 \ 1944 manageable(bool, PrintGCTimeStamps, false, \ 1945 "Print timestamps at garbage collect") \ 1946 \ 1947 product(bool, PrintGCTaskTimeStamps, false, \ 1948 "Print timestamps for individual gc worker thread tasks") \ 1949 \ 1950 develop(intx, ConcGCYieldTimeout, 0, \ 1951 "If non-zero, assert that GC threads yield within this # of ms.") \ 1952 \ 1953 notproduct(bool, TraceMarkSweep, false, \ 1954 "Trace mark sweep") \ 1955 \ 1956 product(bool, PrintReferenceGC, false, \ 1957 "Print times spent handling reference objects during GC " \ 1958 " (enabled only when PrintGCDetails)") \ 1959 \ 1960 develop(bool, TraceReferenceGC, false, \ 1961 "Trace handling of soft/weak/final/phantom references") \ 1962 \ 1963 develop(bool, TraceFinalizerRegistration, false, \ 1964 "Trace registration of final references") \ 1965 \ 1966 notproduct(bool, TraceScavenge, false, \ 1967 "Trace scavenge") \ 1968 \ 1969 product_rw(bool, TraceClassLoading, false, \ 1970 "Trace all classes loaded") \ 1971 \ 1972 product(bool, TraceClassLoadingPreorder, false, \ 1973 "Trace all classes loaded in order referenced (not loaded)") \ 1974 \ 1975 product_rw(bool, TraceClassUnloading, false, \ 1976 "Trace unloading of classes") \ 1977 \ 1978 product_rw(bool, TraceLoaderConstraints, false, \ 1979 "Trace loader constraints") \ 1980 \ 1981 product(bool, TraceGen0Time, false, \ 1982 "Trace accumulated time for Gen 0 collection") \ 1983 \ 1984 product(bool, TraceGen1Time, false, \ 1985 "Trace accumulated time for Gen 1 collection") \ 1986 \ 1987 product(bool, PrintTenuringDistribution, false, \ 1988 "Print tenuring age information") \ 1989 \ 1990 product_rw(bool, PrintHeapAtGC, false, \ 1991 "Print heap layout before and after each GC") \ 1992 \ 1993 product(bool, PrintHeapAtSIGBREAK, true, \ 1994 "Print heap layout in response to SIGBREAK") \ 1995 \ 1996 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 1997 "Print a class histogram before any major stop-world GC") \ 1998 \ 1999 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2000 "Print a class histogram after any major stop-world GC") \ 2001 \ 2002 manageable(bool, PrintClassHistogram, false, \ 2003 "Print a histogram of class instances") \ 2004 \ 2005 develop(bool, TraceWorkGang, false, \ 2006 "Trace activities of work gangs") \ 2007 \ 2008 product(bool, TraceParallelOldGCTasks, false, \ 2009 "Trace multithreaded GC activity") \ 2010 \ 2011 develop(bool, TraceBlockOffsetTable, false, \ 2012 "Print BlockOffsetTable maps") \ 2013 \ 2014 develop(bool, TraceCardTableModRefBS, false, \ 2015 "Print CardTableModRefBS maps") \ 2016 \ 2017 develop(bool, TraceGCTaskManager, false, \ 2018 "Trace actions of the GC task manager") \ 2019 \ 2020 develop(bool, TraceGCTaskQueue, false, \ 2021 "Trace actions of the GC task queues") \ 2022 \ 2023 develop(bool, TraceGCTaskThread, false, \ 2024 "Trace actions of the GC task threads") \ 2025 \ 2026 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2027 "Print the time taken by each parallel old gc phase." \ 2028 "PrintGCDetails must also be enabled.") \ 2029 \ 2030 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2031 "Trace parallel old gc marking phase") \ 2032 \ 2033 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2034 "Trace parallel old gc summary phase") \ 2035 \ 2036 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2037 "Trace parallel old gc compaction phase") \ 2038 \ 2039 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2040 "Trace parallel old gc dense prefix computation") \ 2041 \ 2042 develop(bool, IgnoreLibthreadGPFault, false, \ 2043 "Suppress workaround for libthread GP fault") \ 2044 \ 2045 product(bool, PrintJNIGCStalls, false, \ 2046 "Print diagnostic message when GC is stalled" \ 2047 "by JNI critical section") \ 2048 \ 2049 /* JVMTI heap profiling */ \ 2050 \ 2051 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2052 "Trace JVMTI object tagging calls") \ 2053 \ 2054 diagnostic(bool, VerifyBeforeIteration, false, \ 2055 "Verify memory system before JVMTI iteration") \ 2056 \ 2057 /* compiler interface */ \ 2058 \ 2059 develop(bool, CIPrintCompilerName, false, \ 2060 "when CIPrint is active, print the name of the active compiler") \ 2061 \ 2062 develop(bool, CIPrintCompileQueue, false, \ 2063 "display the contents of the compile queue whenever a " \ 2064 "compilation is enqueued") \ 2065 \ 2066 develop(bool, CIPrintRequests, false, \ 2067 "display every request for compilation") \ 2068 \ 2069 product(bool, CITime, false, \ 2070 "collect timing information for compilation") \ 2071 \ 2072 develop(bool, CITimeEach, false, \ 2073 "display timing information after each successful compilation") \ 2074 \ 2075 develop(bool, CICountOSR, true, \ 2076 "use a separate counter when assigning ids to osr compilations") \ 2077 \ 2078 develop(bool, CICompileNatives, true, \ 2079 "compile native methods if supported by the compiler") \ 2080 \ 2081 develop_pd(bool, CICompileOSR, \ 2082 "compile on stack replacement methods if supported by the " \ 2083 "compiler") \ 2084 \ 2085 develop(bool, CIPrintMethodCodes, false, \ 2086 "print method bytecodes of the compiled code") \ 2087 \ 2088 develop(bool, CIPrintTypeFlow, false, \ 2089 "print the results of ciTypeFlow analysis") \ 2090 \ 2091 develop(bool, CITraceTypeFlow, false, \ 2092 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2093 \ 2094 develop(intx, CICloneLoopTestLimit, 100, \ 2095 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2096 \ 2097 /* temp diagnostics */ \ 2098 \ 2099 diagnostic(bool, TraceRedundantCompiles, false, \ 2100 "Have compile broker print when a request already in the queue is"\ 2101 " requested again") \ 2102 \ 2103 diagnostic(bool, InitialCompileFast, false, \ 2104 "Initial compile at CompLevel_fast_compile") \ 2105 \ 2106 diagnostic(bool, InitialCompileReallyFast, false, \ 2107 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2108 \ 2109 diagnostic(bool, FullProfileOnReInterpret, true, \ 2110 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2111 \ 2112 /* compiler */ \ 2113 \ 2114 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2115 "Number of compiler threads to run") \ 2116 \ 2117 product(intx, CompilationPolicyChoice, 0, \ 2118 "which compilation policy (0/1)") \ 2119 \ 2120 develop(bool, UseStackBanging, true, \ 2121 "use stack banging for stack overflow checks (required for " \ 2122 "proper StackOverflow handling; disable only to measure cost " \ 2123 "of stackbanging)") \ 2124 \ 2125 develop(bool, Use24BitFPMode, true, \ 2126 "Set 24-bit FPU mode on a per-compile basis ") \ 2127 \ 2128 develop(bool, Use24BitFP, true, \ 2129 "use FP instructions that produce 24-bit precise results") \ 2130 \ 2131 develop(bool, UseStrictFP, true, \ 2132 "use strict fp if modifier strictfp is set") \ 2133 \ 2134 develop(bool, GenerateSynchronizationCode, true, \ 2135 "generate locking/unlocking code for synchronized methods and " \ 2136 "monitors") \ 2137 \ 2138 develop(bool, GenerateCompilerNullChecks, true, \ 2139 "Generate explicit null checks for loads/stores/calls") \ 2140 \ 2141 develop(bool, GenerateRangeChecks, true, \ 2142 "Generate range checks for array accesses") \ 2143 \ 2144 develop_pd(bool, ImplicitNullChecks, \ 2145 "generate code for implicit null checks") \ 2146 \ 2147 product(bool, PrintSafepointStatistics, false, \ 2148 "print statistics about safepoint synchronization") \ 2149 \ 2150 product(intx, PrintSafepointStatisticsCount, 300, \ 2151 "total number of safepoint statistics collected " \ 2152 "before printing them out") \ 2153 \ 2154 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2155 "print safepoint statistics only when safepoint takes" \ 2156 " more than PrintSafepointSatisticsTimeout in millis") \ 2157 \ 2158 develop(bool, InlineAccessors, true, \ 2159 "inline accessor methods (get/set)") \ 2160 \ 2161 product(bool, Inline, true, \ 2162 "enable inlining") \ 2163 \ 2164 product(bool, ClipInlining, true, \ 2165 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2166 \ 2167 develop(bool, UseCHA, true, \ 2168 "enable CHA") \ 2169 \ 2170 product(bool, UseTypeProfile, true, \ 2171 "Check interpreter profile for historically monomorphic calls") \ 2172 \ 2173 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2174 "% of major receiver type to all profiled receivers") \ 2175 \ 2176 notproduct(bool, TimeCompiler, false, \ 2177 "time the compiler") \ 2178 \ 2179 notproduct(bool, TimeCompiler2, false, \ 2180 "detailed time the compiler (requires +TimeCompiler)") \ 2181 \ 2182 diagnostic(bool, PrintInlining, false, \ 2183 "prints inlining optimizations") \ 2184 \ 2185 diagnostic(bool, PrintIntrinsics, false, \ 2186 "prints attempted and successful inlining of intrinsics") \ 2187 \ 2188 product(bool, UseCountLeadingZerosInstruction, false, \ 2189 "Use count leading zeros instruction") \ 2190 \ 2191 product(bool, UsePopCountInstruction, false, \ 2192 "Use population count instruction") \ 2193 \ 2194 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2195 "do not expand intrinsics whose (internal) names appear here") \ 2196 \ 2197 develop(bool, StressReflectiveCode, false, \ 2198 "Use inexact types at allocations, etc., to test reflection") \ 2199 \ 2200 develop(bool, EagerInitialization, false, \ 2201 "Eagerly initialize classes if possible") \ 2202 \ 2203 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2204 "Update methodDataOops in Tier1-generated code") \ 2205 \ 2206 develop(bool, TraceMethodReplacement, false, \ 2207 "Print when methods are replaced do to recompilation") \ 2208 \ 2209 develop(bool, PrintMethodFlushing, false, \ 2210 "print the nmethods being flushed") \ 2211 \ 2212 notproduct(bool, LogMultipleMutexLocking, false, \ 2213 "log locking and unlocking of mutexes (only if multiple locks " \ 2214 "are held)") \ 2215 \ 2216 develop(bool, UseRelocIndex, false, \ 2217 "use an index to speed random access to relocations") \ 2218 \ 2219 develop(bool, StressCodeBuffers, false, \ 2220 "Exercise code buffer expansion and other rare state changes") \ 2221 \ 2222 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2223 "Generate extra debugging info for non-safepoints in nmethods") \ 2224 \ 2225 diagnostic(bool, DebugInlinedCalls, true, \ 2226 "If false, restricts profiled locations to the root method only") \ 2227 \ 2228 product(bool, PrintVMOptions, trueInDebug, \ 2229 "print VM flag settings") \ 2230 \ 2231 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2232 "Ignore unrecognized VM options") \ 2233 \ 2234 diagnostic(bool, SerializeVMOutput, true, \ 2235 "Use a mutex to serialize output to tty and hotspot.log") \ 2236 \ 2237 diagnostic(bool, DisplayVMOutput, true, \ 2238 "Display all VM output on the tty, independently of LogVMOutput") \ 2239 \ 2240 diagnostic(bool, LogVMOutput, trueInDebug, \ 2241 "Save VM output to hotspot.log, or to LogFile") \ 2242 \ 2243 diagnostic(ccstr, LogFile, NULL, \ 2244 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2245 \ 2246 product(ccstr, ErrorFile, NULL, \ 2247 "If an error occurs, save the error data to this file " \ 2248 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2249 \ 2250 product(bool, DisplayVMOutputToStderr, false, \ 2251 "If DisplayVMOutput is true, display all VM output to stderr") \ 2252 \ 2253 product(bool, DisplayVMOutputToStdout, false, \ 2254 "If DisplayVMOutput is true, display all VM output to stdout") \ 2255 \ 2256 product(bool, UseHeavyMonitors, false, \ 2257 "use heavyweight instead of lightweight Java monitors") \ 2258 \ 2259 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2260 "print histogram of the symbol table") \ 2261 \ 2262 notproduct(bool, ExitVMOnVerifyError, false, \ 2263 "standard exit from VM if bytecode verify error " \ 2264 "(only in debug mode)") \ 2265 \ 2266 notproduct(ccstr, AbortVMOnException, NULL, \ 2267 "Call fatal if this exception is thrown. Example: " \ 2268 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2269 \ 2270 develop(bool, DebugVtables, false, \ 2271 "add debugging code to vtable dispatch") \ 2272 \ 2273 develop(bool, PrintVtables, false, \ 2274 "print vtables when printing klass") \ 2275 \ 2276 notproduct(bool, PrintVtableStats, false, \ 2277 "print vtables stats at end of run") \ 2278 \ 2279 develop(bool, TraceCreateZombies, false, \ 2280 "trace creation of zombie nmethods") \ 2281 \ 2282 notproduct(bool, IgnoreLockingAssertions, false, \ 2283 "disable locking assertions (for speed)") \ 2284 \ 2285 notproduct(bool, VerifyLoopOptimizations, false, \ 2286 "verify major loop optimizations") \ 2287 \ 2288 product(bool, RangeCheckElimination, true, \ 2289 "Split loop iterations to eliminate range checks") \ 2290 \ 2291 develop_pd(bool, UncommonNullCast, \ 2292 "track occurrences of null in casts; adjust compiler tactics") \ 2293 \ 2294 develop(bool, TypeProfileCasts, true, \ 2295 "treat casts like calls for purposes of type profiling") \ 2296 \ 2297 develop(bool, MonomorphicArrayCheck, true, \ 2298 "Uncommon-trap array store checks that require full type check") \ 2299 \ 2300 develop(bool, DelayCompilationDuringStartup, true, \ 2301 "Delay invoking the compiler until main application class is " \ 2302 "loaded") \ 2303 \ 2304 develop(bool, CompileTheWorld, false, \ 2305 "Compile all methods in all classes in bootstrap class path " \ 2306 "(stress test)") \ 2307 \ 2308 develop(bool, CompileTheWorldPreloadClasses, true, \ 2309 "Preload all classes used by a class before start loading") \ 2310 \ 2311 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2312 "Compile all methods although class initializer failed") \ 2313 \ 2314 develop(bool, TraceIterativeGVN, false, \ 2315 "Print progress during Iterative Global Value Numbering") \ 2316 \ 2317 develop(bool, FillDelaySlots, true, \ 2318 "Fill delay slots (on SPARC only)") \ 2319 \ 2320 develop(bool, VerifyIterativeGVN, false, \ 2321 "Verify Def-Use modifications during sparse Iterative Global " \ 2322 "Value Numbering") \ 2323 \ 2324 notproduct(bool, TracePhaseCCP, false, \ 2325 "Print progress during Conditional Constant Propagation") \ 2326 \ 2327 develop(bool, TimeLivenessAnalysis, false, \ 2328 "Time computation of bytecode liveness analysis") \ 2329 \ 2330 develop(bool, TraceLivenessGen, false, \ 2331 "Trace the generation of liveness analysis information") \ 2332 \ 2333 notproduct(bool, TraceLivenessQuery, false, \ 2334 "Trace queries of liveness analysis information") \ 2335 \ 2336 notproduct(bool, CollectIndexSetStatistics, false, \ 2337 "Collect information about IndexSets") \ 2338 \ 2339 develop(bool, PrintDominators, false, \ 2340 "Print out dominator trees for GVN") \ 2341 \ 2342 develop(bool, UseLoopSafepoints, true, \ 2343 "Generate Safepoint nodes in every loop") \ 2344 \ 2345 notproduct(bool, TraceCISCSpill, false, \ 2346 "Trace allocators use of cisc spillable instructions") \ 2347 \ 2348 notproduct(bool, TraceSpilling, false, \ 2349 "Trace spilling") \ 2350 \ 2351 develop(bool, DeutschShiffmanExceptions, true, \ 2352 "Fast check to find exception handler for precisely typed " \ 2353 "exceptions") \ 2354 \ 2355 product(bool, SplitIfBlocks, true, \ 2356 "Clone compares and control flow through merge points to fold " \ 2357 "some branches") \ 2358 \ 2359 develop(intx, FastAllocateSizeLimit, 128*K, \ 2360 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2361 "Inline allocations larger than this in doublewords must go slow")\ 2362 \ 2363 product(bool, AggressiveOpts, false, \ 2364 "Enable aggressive optimizations - see arguments.cpp") \ 2365 \ 2366 product(bool, UseStringCache, false, \ 2367 "Enable String cache capabilities on String.java") \ 2368 \ 2369 /* statistics */ \ 2370 develop(bool, UseVTune, false, \ 2371 "enable support for Intel's VTune profiler") \ 2372 \ 2373 develop(bool, CountCompiledCalls, false, \ 2374 "counts method invocations") \ 2375 \ 2376 notproduct(bool, CountRuntimeCalls, false, \ 2377 "counts VM runtime calls") \ 2378 \ 2379 develop(bool, CountJNICalls, false, \ 2380 "counts jni method invocations") \ 2381 \ 2382 notproduct(bool, CountJVMCalls, false, \ 2383 "counts jvm method invocations") \ 2384 \ 2385 notproduct(bool, CountRemovableExceptions, false, \ 2386 "count exceptions that could be replaced by branches due to " \ 2387 "inlining") \ 2388 \ 2389 notproduct(bool, ICMissHistogram, false, \ 2390 "produce histogram of IC misses") \ 2391 \ 2392 notproduct(bool, PrintClassStatistics, false, \ 2393 "prints class statistics at end of run") \ 2394 \ 2395 notproduct(bool, PrintMethodStatistics, false, \ 2396 "prints method statistics at end of run") \ 2397 \ 2398 /* interpreter */ \ 2399 develop(bool, ClearInterpreterLocals, false, \ 2400 "Always clear local variables of interpreter activations upon " \ 2401 "entry") \ 2402 \ 2403 product_pd(bool, RewriteBytecodes, \ 2404 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2405 \ 2406 product_pd(bool, RewriteFrequentPairs, \ 2407 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2408 \ 2409 diagnostic(bool, PrintInterpreter, false, \ 2410 "Prints the generated interpreter code") \ 2411 \ 2412 product(bool, UseInterpreter, true, \ 2413 "Use interpreter for non-compiled methods") \ 2414 \ 2415 develop(bool, UseFastSignatureHandlers, true, \ 2416 "Use fast signature handlers for native calls") \ 2417 \ 2418 develop(bool, UseV8InstrsOnly, false, \ 2419 "Use SPARC-V8 Compliant instruction subset") \ 2420 \ 2421 product(bool, UseNiagaraInstrs, false, \ 2422 "Use Niagara-efficient instruction subset") \ 2423 \ 2424 develop(bool, UseCASForSwap, false, \ 2425 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2426 \ 2427 product(bool, UseLoopCounter, true, \ 2428 "Increment invocation counter on backward branch") \ 2429 \ 2430 product(bool, UseFastEmptyMethods, true, \ 2431 "Use fast method entry code for empty methods") \ 2432 \ 2433 product(bool, UseFastAccessorMethods, true, \ 2434 "Use fast method entry code for accessor methods") \ 2435 \ 2436 product_pd(bool, UseOnStackReplacement, \ 2437 "Use on stack replacement, calls runtime if invoc. counter " \ 2438 "overflows in loop") \ 2439 \ 2440 notproduct(bool, TraceOnStackReplacement, false, \ 2441 "Trace on stack replacement") \ 2442 \ 2443 develop(bool, PoisonOSREntry, true, \ 2444 "Detect abnormal calls to OSR code") \ 2445 \ 2446 product_pd(bool, PreferInterpreterNativeStubs, \ 2447 "Use always interpreter stubs for native methods invoked via " \ 2448 "interpreter") \ 2449 \ 2450 develop(bool, CountBytecodes, false, \ 2451 "Count number of bytecodes executed") \ 2452 \ 2453 develop(bool, PrintBytecodeHistogram, false, \ 2454 "Print histogram of the executed bytecodes") \ 2455 \ 2456 develop(bool, PrintBytecodePairHistogram, false, \ 2457 "Print histogram of the executed bytecode pairs") \ 2458 \ 2459 diagnostic(bool, PrintSignatureHandlers, false, \ 2460 "Print code generated for native method signature handlers") \ 2461 \ 2462 develop(bool, VerifyOops, false, \ 2463 "Do plausibility checks for oops") \ 2464 \ 2465 develop(bool, CheckUnhandledOops, false, \ 2466 "Check for unhandled oops in VM code") \ 2467 \ 2468 develop(bool, VerifyJNIFields, trueInDebug, \ 2469 "Verify jfieldIDs for instance fields") \ 2470 \ 2471 notproduct(bool, VerifyJNIEnvThread, false, \ 2472 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2473 "from JNI") \ 2474 \ 2475 develop(bool, VerifyFPU, false, \ 2476 "Verify FPU state (check for NaN's, etc.)") \ 2477 \ 2478 develop(bool, VerifyThread, false, \ 2479 "Watch the thread register for corruption (SPARC only)") \ 2480 \ 2481 develop(bool, VerifyActivationFrameSize, false, \ 2482 "Verify that activation frame didn't become smaller than its " \ 2483 "minimal size") \ 2484 \ 2485 develop(bool, TraceFrequencyInlining, false, \ 2486 "Trace frequency based inlining") \ 2487 \ 2488 notproduct(bool, TraceTypeProfile, false, \ 2489 "Trace type profile") \ 2490 \ 2491 develop_pd(bool, InlineIntrinsics, \ 2492 "Inline intrinsics that can be statically resolved") \ 2493 \ 2494 product_pd(bool, ProfileInterpreter, \ 2495 "Profile at the bytecode level during interpretation") \ 2496 \ 2497 develop_pd(bool, ProfileTraps, \ 2498 "Profile deoptimization traps at the bytecode level") \ 2499 \ 2500 product(intx, ProfileMaturityPercentage, 20, \ 2501 "number of method invocations/branches (expressed as % of " \ 2502 "CompileThreshold) before using the method's profile") \ 2503 \ 2504 develop(bool, PrintMethodData, false, \ 2505 "Print the results of +ProfileInterpreter at end of run") \ 2506 \ 2507 develop(bool, VerifyDataPointer, trueInDebug, \ 2508 "Verify the method data pointer during interpreter profiling") \ 2509 \ 2510 develop(bool, VerifyCompiledCode, false, \ 2511 "Include miscellaneous runtime verifications in nmethod code; " \ 2512 "off by default because it disturbs nmethod size heuristics.") \ 2513 \ 2514 \ 2515 /* compilation */ \ 2516 product(bool, UseCompiler, true, \ 2517 "use compilation") \ 2518 \ 2519 develop(bool, TraceCompilationPolicy, false, \ 2520 "Trace compilation policy") \ 2521 \ 2522 develop(bool, TimeCompilationPolicy, false, \ 2523 "Time the compilation policy") \ 2524 \ 2525 product(bool, UseCounterDecay, true, \ 2526 "adjust recompilation counters") \ 2527 \ 2528 develop(intx, CounterHalfLifeTime, 30, \ 2529 "half-life time of invocation counters (in secs)") \ 2530 \ 2531 develop(intx, CounterDecayMinIntervalLength, 500, \ 2532 "Min. ms. between invocation of CounterDecay") \ 2533 \ 2534 product(bool, AlwaysCompileLoopMethods, false, \ 2535 "when using recompilation, never interpret methods " \ 2536 "containing loops") \ 2537 \ 2538 product(bool, DontCompileHugeMethods, true, \ 2539 "don't compile methods > HugeMethodLimit") \ 2540 \ 2541 /* Bytecode escape analysis estimation. */ \ 2542 product(bool, EstimateArgEscape, true, \ 2543 "Analyze bytecodes to estimate escape state of arguments") \ 2544 \ 2545 product(intx, BCEATraceLevel, 0, \ 2546 "How much tracing to do of bytecode escape analysis estimates") \ 2547 \ 2548 product(intx, MaxBCEAEstimateLevel, 5, \ 2549 "Maximum number of nested calls that are analyzed by BC EA.") \ 2550 \ 2551 product(intx, MaxBCEAEstimateSize, 150, \ 2552 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2553 \ 2554 product(intx, AllocatePrefetchStyle, 1, \ 2555 "0 = no prefetch, " \ 2556 "1 = prefetch instructions for each allocation, " \ 2557 "2 = use TLAB watermark to gate allocation prefetch") \ 2558 \ 2559 product(intx, AllocatePrefetchDistance, -1, \ 2560 "Distance to prefetch ahead of allocation pointer") \ 2561 \ 2562 product(intx, AllocatePrefetchLines, 1, \ 2563 "Number of lines to prefetch ahead of allocation pointer") \ 2564 \ 2565 product(intx, AllocatePrefetchStepSize, 16, \ 2566 "Step size in bytes of sequential prefetch instructions") \ 2567 \ 2568 product(intx, AllocatePrefetchInstr, 0, \ 2569 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2570 \ 2571 product(intx, ReadPrefetchInstr, 0, \ 2572 "Prefetch instruction to prefetch ahead") \ 2573 \ 2574 /* deoptimization */ \ 2575 develop(bool, TraceDeoptimization, false, \ 2576 "Trace deoptimization") \ 2577 \ 2578 develop(bool, DebugDeoptimization, false, \ 2579 "Tracing various information while debugging deoptimization") \ 2580 \ 2581 product(intx, SelfDestructTimer, 0, \ 2582 "Will cause VM to terminate after a given time (in minutes) " \ 2583 "(0 means off)") \ 2584 \ 2585 product(intx, MaxJavaStackTraceDepth, 1024, \ 2586 "Max. no. of lines in the stack trace for Java exceptions " \ 2587 "(0 means all)") \ 2588 \ 2589 develop(intx, GuaranteedSafepointInterval, 1000, \ 2590 "Guarantee a safepoint (at least) every so many milliseconds " \ 2591 "(0 means none)") \ 2592 \ 2593 product(intx, SafepointTimeoutDelay, 10000, \ 2594 "Delay in milliseconds for option SafepointTimeout") \ 2595 \ 2596 product(intx, NmethodSweepFraction, 4, \ 2597 "Number of invocations of sweeper to cover all nmethods") \ 2598 \ 2599 notproduct(intx, MemProfilingInterval, 500, \ 2600 "Time between each invocation of the MemProfiler") \ 2601 \ 2602 develop(intx, MallocCatchPtr, -1, \ 2603 "Hit breakpoint when mallocing/freeing this pointer") \ 2604 \ 2605 notproduct(intx, AssertRepeat, 1, \ 2606 "number of times to evaluate expression in assert " \ 2607 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2608 \ 2609 notproduct(ccstrlist, SuppressErrorAt, "", \ 2610 "List of assertions (file:line) to muzzle") \ 2611 \ 2612 notproduct(uintx, HandleAllocationLimit, 1024, \ 2613 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2614 "is used") \ 2615 \ 2616 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2617 "Threshold for total handle allocation when " \ 2618 "+TraceHandleAllocation is used") \ 2619 \ 2620 develop(intx, StackPrintLimit, 100, \ 2621 "number of stack frames to print in VM-level stack dump") \ 2622 \ 2623 notproduct(intx, MaxElementPrintSize, 256, \ 2624 "maximum number of elements to print") \ 2625 \ 2626 notproduct(intx, MaxSubklassPrintSize, 4, \ 2627 "maximum number of subklasses to print when printing klass") \ 2628 \ 2629 develop(intx, MaxInlineLevel, 9, \ 2630 "maximum number of nested calls that are inlined") \ 2631 \ 2632 develop(intx, MaxRecursiveInlineLevel, 1, \ 2633 "maximum number of nested recursive calls that are inlined") \ 2634 \ 2635 product_pd(intx, InlineSmallCode, \ 2636 "Only inline already compiled methods if their code size is " \ 2637 "less than this") \ 2638 \ 2639 product(intx, MaxInlineSize, 35, \ 2640 "maximum bytecode size of a method to be inlined") \ 2641 \ 2642 product_pd(intx, FreqInlineSize, \ 2643 "maximum bytecode size of a frequent method to be inlined") \ 2644 \ 2645 develop(intx, MaxTrivialSize, 6, \ 2646 "maximum bytecode size of a trivial method to be inlined") \ 2647 \ 2648 develop(intx, MinInliningThreshold, 250, \ 2649 "min. invocation count a method needs to have to be inlined") \ 2650 \ 2651 develop(intx, AlignEntryCode, 4, \ 2652 "aligns entry code to specified value (in bytes)") \ 2653 \ 2654 develop(intx, MethodHistogramCutoff, 100, \ 2655 "cutoff value for method invoc. histogram (+CountCalls)") \ 2656 \ 2657 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2658 "# of interpreted methods to show in profile") \ 2659 \ 2660 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2661 "# of compiled methods to show in profile") \ 2662 \ 2663 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2664 "# of stub methods to show in profile") \ 2665 \ 2666 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2667 "# of runtime stub nodes to show in profile") \ 2668 \ 2669 product(intx, ProfileIntervalsTicks, 100, \ 2670 "# of ticks between printing of interval profile " \ 2671 "(+ProfileIntervals)") \ 2672 \ 2673 notproduct(intx, ScavengeALotInterval, 1, \ 2674 "Interval between which scavenge will occur with +ScavengeALot") \ 2675 \ 2676 notproduct(intx, FullGCALotInterval, 1, \ 2677 "Interval between which full gc will occur with +FullGCALot") \ 2678 \ 2679 notproduct(intx, FullGCALotStart, 0, \ 2680 "For which invocation to start FullGCAlot") \ 2681 \ 2682 notproduct(intx, FullGCALotDummies, 32*K, \ 2683 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2684 "to move") \ 2685 \ 2686 develop(intx, DontYieldALotInterval, 10, \ 2687 "Interval between which yields will be dropped (milliseconds)") \ 2688 \ 2689 develop(intx, MinSleepInterval, 1, \ 2690 "Minimum sleep() interval (milliseconds) when " \ 2691 "ConvertSleepToYield is off (used for SOLARIS)") \ 2692 \ 2693 product(intx, EventLogLength, 2000, \ 2694 "maximum nof events in event log") \ 2695 \ 2696 develop(intx, ProfilerPCTickThreshold, 15, \ 2697 "Number of ticks in a PC buckets to be a hotspot") \ 2698 \ 2699 notproduct(intx, DeoptimizeALotInterval, 5, \ 2700 "Number of exits until DeoptimizeALot kicks in") \ 2701 \ 2702 notproduct(intx, ZombieALotInterval, 5, \ 2703 "Number of exits until ZombieALot kicks in") \ 2704 \ 2705 develop(bool, StressNonEntrant, false, \ 2706 "Mark nmethods non-entrant at registration") \ 2707 \ 2708 diagnostic(intx, MallocVerifyInterval, 0, \ 2709 "if non-zero, verify C heap after every N calls to " \ 2710 "malloc/realloc/free") \ 2711 \ 2712 diagnostic(intx, MallocVerifyStart, 0, \ 2713 "if non-zero, start verifying C heap after Nth call to " \ 2714 "malloc/realloc/free") \ 2715 \ 2716 product(intx, TypeProfileWidth, 2, \ 2717 "number of receiver types to record in call/cast profile") \ 2718 \ 2719 develop(intx, BciProfileWidth, 2, \ 2720 "number of return bci's to record in ret profile") \ 2721 \ 2722 product(intx, PerMethodRecompilationCutoff, 400, \ 2723 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2724 \ 2725 product(intx, PerBytecodeRecompilationCutoff, 100, \ 2726 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2727 \ 2728 product(intx, PerMethodTrapLimit, 100, \ 2729 "Limit on traps (of one kind) in a method (includes inlines)") \ 2730 \ 2731 product(intx, PerBytecodeTrapLimit, 4, \ 2732 "Limit on traps (of one kind) at a particular BCI") \ 2733 \ 2734 develop(intx, FreqCountInvocations, 1, \ 2735 "Scaling factor for branch frequencies (deprecated)") \ 2736 \ 2737 develop(intx, InlineFrequencyRatio, 20, \ 2738 "Ratio of call site execution to caller method invocation") \ 2739 \ 2740 develop_pd(intx, InlineFrequencyCount, \ 2741 "Count of call site execution necessary to trigger frequent " \ 2742 "inlining") \ 2743 \ 2744 develop(intx, InlineThrowCount, 50, \ 2745 "Force inlining of interpreted methods that throw this often") \ 2746 \ 2747 develop(intx, InlineThrowMaxSize, 200, \ 2748 "Force inlining of throwing methods smaller than this") \ 2749 \ 2750 product(intx, AliasLevel, 3, \ 2751 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2752 "2 for class split, 3 for unique instances") \ 2753 \ 2754 develop(bool, VerifyAliases, false, \ 2755 "perform extra checks on the results of alias analysis") \ 2756 \ 2757 develop(intx, ProfilerNodeSize, 1024, \ 2758 "Size in K to allocate for the Profile Nodes of each thread") \ 2759 \ 2760 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2761 "Number of times to spin wait on a v8 atomic operation lock") \ 2762 \ 2763 product(intx, ReadSpinIterations, 100, \ 2764 "Number of read attempts before a yield (spin inner loop)") \ 2765 \ 2766 product_pd(intx, PreInflateSpin, \ 2767 "Number of times to spin wait before inflation") \ 2768 \ 2769 product(intx, PreBlockSpin, 10, \ 2770 "Number of times to spin in an inflated lock before going to " \ 2771 "an OS lock") \ 2772 \ 2773 /* gc parameters */ \ 2774 product(uintx, MaxHeapSize, ScaleForWordSize(64*M), \ 2775 "Default maximum size for object heap (in bytes)") \ 2776 \ 2777 product_pd(uintx, NewSize, \ 2778 "Default size of new generation (in bytes)") \ 2779 \ 2780 product(uintx, MaxNewSize, max_uintx, \ 2781 "Maximum size of new generation (in bytes)") \ 2782 \ 2783 product(uintx, PretenureSizeThreshold, 0, \ 2784 "Max size in bytes of objects allocated in DefNew generation") \ 2785 \ 2786 product_pd(uintx, TLABSize, \ 2787 "Default (or starting) size of TLAB (in bytes)") \ 2788 \ 2789 product(uintx, MinTLABSize, 2*K, \ 2790 "Minimum allowed TLAB size (in bytes)") \ 2791 \ 2792 product(uintx, TLABAllocationWeight, 35, \ 2793 "Allocation averaging weight") \ 2794 \ 2795 product(uintx, TLABWasteTargetPercent, 1, \ 2796 "Percentage of Eden that can be wasted") \ 2797 \ 2798 product(uintx, TLABRefillWasteFraction, 64, \ 2799 "Max TLAB waste at a refill (internal fragmentation)") \ 2800 \ 2801 product(uintx, TLABWasteIncrement, 4, \ 2802 "Increment allowed waste at slow allocation") \ 2803 \ 2804 product_pd(intx, SurvivorRatio, \ 2805 "Ratio of eden/survivor space size") \ 2806 \ 2807 product_pd(intx, NewRatio, \ 2808 "Ratio of new/old generation sizes") \ 2809 \ 2810 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2811 "Max percent of eden objects that will be live at scavenge") \ 2812 \ 2813 product_pd(uintx, NewSizeThreadIncrease, \ 2814 "Additional size added to desired new generation size per " \ 2815 "non-daemon thread (in bytes)") \ 2816 \ 2817 product(uintx, OldSize, ScaleForWordSize(4096*K), \ 2818 "Default size of tenured generation (in bytes)") \ 2819 \ 2820 product_pd(uintx, PermSize, \ 2821 "Default size of permanent generation (in bytes)") \ 2822 \ 2823 product_pd(uintx, MaxPermSize, \ 2824 "Maximum size of permanent generation (in bytes)") \ 2825 \ 2826 product(uintx, MinHeapFreeRatio, 40, \ 2827 "Min percentage of heap free after GC to avoid expansion") \ 2828 \ 2829 product(uintx, MaxHeapFreeRatio, 70, \ 2830 "Max percentage of heap free after GC to avoid shrinking") \ 2831 \ 2832 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2833 "Number of milliseconds per MB of free space in the heap") \ 2834 \ 2835 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2836 "Min change in heap space due to GC (in bytes)") \ 2837 \ 2838 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 2839 "Min expansion of permanent heap (in bytes)") \ 2840 \ 2841 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 2842 "Max expansion of permanent heap without full GC (in bytes)") \ 2843 \ 2844 product(intx, QueuedAllocationWarningCount, 0, \ 2845 "Number of times an allocation that queues behind a GC " \ 2846 "will retry before printing a warning") \ 2847 \ 2848 diagnostic(uintx, VerifyGCStartAt, 0, \ 2849 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 2850 \ 2851 diagnostic(intx, VerifyGCLevel, 0, \ 2852 "Generation level at which to start +VerifyBefore/AfterGC") \ 2853 \ 2854 develop(uintx, ExitAfterGCNum, 0, \ 2855 "If non-zero, exit after this GC.") \ 2856 \ 2857 product(intx, MaxTenuringThreshold, 15, \ 2858 "Maximum value for tenuring threshold") \ 2859 \ 2860 product(intx, InitialTenuringThreshold, 7, \ 2861 "Initial value for tenuring threshold") \ 2862 \ 2863 product(intx, TargetSurvivorRatio, 50, \ 2864 "Desired percentage of survivor space used after scavenge") \ 2865 \ 2866 product(uintx, MarkSweepDeadRatio, 5, \ 2867 "Percentage (0-100) of the old gen allowed as dead wood." \ 2868 "Serial mark sweep treats this as both the min and max value." \ 2869 "CMS uses this value only if it falls back to mark sweep." \ 2870 "Par compact uses a variable scale based on the density of the" \ 2871 "generation and treats this as the max value when the heap is" \ 2872 "either completely full or completely empty. Par compact also" \ 2873 "has a smaller default value; see arguments.cpp.") \ 2874 \ 2875 product(uintx, PermMarkSweepDeadRatio, 20, \ 2876 "Percentage (0-100) of the perm gen allowed as dead wood." \ 2877 "See MarkSweepDeadRatio for collector-specific comments.") \ 2878 \ 2879 product(intx, MarkSweepAlwaysCompactCount, 4, \ 2880 "How often should we fully compact the heap (ignoring the dead " \ 2881 "space parameters)") \ 2882 \ 2883 product(intx, PrintCMSStatistics, 0, \ 2884 "Statistics for CMS") \ 2885 \ 2886 product(bool, PrintCMSInitiationStatistics, false, \ 2887 "Statistics for initiating a CMS collection") \ 2888 \ 2889 product(intx, PrintFLSStatistics, 0, \ 2890 "Statistics for CMS' FreeListSpace") \ 2891 \ 2892 product(intx, PrintFLSCensus, 0, \ 2893 "Census for CMS' FreeListSpace") \ 2894 \ 2895 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 2896 "Delay in ms between expansion and allocation") \ 2897 \ 2898 product(intx, DeferThrSuspendLoopCount, 4000, \ 2899 "(Unstable) Number of times to iterate in safepoint loop " \ 2900 " before blocking VM threads ") \ 2901 \ 2902 product(intx, DeferPollingPageLoopCount, -1, \ 2903 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 2904 "before changing safepoint polling page to RO ") \ 2905 \ 2906 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 2907 \ 2908 product(bool, UseDepthFirstScavengeOrder, true, \ 2909 "true: the scavenge order will be depth-first, " \ 2910 "false: the scavenge order will be breadth-first") \ 2911 \ 2912 product(bool, PSChunkLargeArrays, true, \ 2913 "true: process large arrays in chunks") \ 2914 \ 2915 product(uintx, GCDrainStackTargetSize, 64, \ 2916 "how many entries we'll try to leave on the stack during " \ 2917 "parallel GC") \ 2918 \ 2919 product(intx, DCQBarrierQueueBufferSize, 256, \ 2920 "Number of elements in a dirty card queue buffer") \ 2921 \ 2922 product(intx, DCQBarrierProcessCompletedThreshold, 5, \ 2923 "Number of completed dirty card buffers to trigger processing.") \ 2924 \ 2925 /* stack parameters */ \ 2926 product_pd(intx, StackYellowPages, \ 2927 "Number of yellow zone (recoverable overflows) pages") \ 2928 \ 2929 product_pd(intx, StackRedPages, \ 2930 "Number of red zone (unrecoverable overflows) pages") \ 2931 \ 2932 product_pd(intx, StackShadowPages, \ 2933 "Number of shadow zone (for overflow checking) pages" \ 2934 " this should exceed the depth of the VM and native call stack") \ 2935 \ 2936 product_pd(intx, ThreadStackSize, \ 2937 "Thread Stack Size (in Kbytes)") \ 2938 \ 2939 product_pd(intx, VMThreadStackSize, \ 2940 "Non-Java Thread Stack Size (in Kbytes)") \ 2941 \ 2942 product_pd(intx, CompilerThreadStackSize, \ 2943 "Compiler Thread Stack Size (in Kbytes)") \ 2944 \ 2945 develop_pd(uintx, JVMInvokeMethodSlack, \ 2946 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 2947 \ 2948 product(uintx, ThreadSafetyMargin, 50*M, \ 2949 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 2950 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 2951 "disable this feature") \ 2952 \ 2953 /* code cache parameters */ \ 2954 develop(uintx, CodeCacheSegmentSize, 64, \ 2955 "Code cache segment size (in bytes) - smallest unit of " \ 2956 "allocation") \ 2957 \ 2958 develop_pd(intx, CodeEntryAlignment, \ 2959 "Code entry alignment for generated code (in bytes)") \ 2960 \ 2961 product_pd(uintx, InitialCodeCacheSize, \ 2962 "Initial code cache size (in bytes)") \ 2963 \ 2964 product_pd(uintx, ReservedCodeCacheSize, \ 2965 "Reserved code cache size (in bytes) - maximum code cache size") \ 2966 \ 2967 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 2968 "When less than X space left, we stop compiling.") \ 2969 \ 2970 product_pd(uintx, CodeCacheExpansionSize, \ 2971 "Code cache expansion size (in bytes)") \ 2972 \ 2973 develop_pd(uintx, CodeCacheMinBlockLength, \ 2974 "Minimum number of segments in a code cache block.") \ 2975 \ 2976 notproduct(bool, ExitOnFullCodeCache, false, \ 2977 "Exit the VM if we fill the code cache.") \ 2978 \ 2979 /* interpreter debugging */ \ 2980 develop(intx, BinarySwitchThreshold, 5, \ 2981 "Minimal number of lookupswitch entries for rewriting to binary " \ 2982 "switch") \ 2983 \ 2984 develop(intx, StopInterpreterAt, 0, \ 2985 "Stops interpreter execution at specified bytecode number") \ 2986 \ 2987 develop(intx, TraceBytecodesAt, 0, \ 2988 "Traces bytecodes starting with specified bytecode number") \ 2989 \ 2990 /* compiler interface */ \ 2991 develop(intx, CIStart, 0, \ 2992 "the id of the first compilation to permit") \ 2993 \ 2994 develop(intx, CIStop, -1, \ 2995 "the id of the last compilation to permit") \ 2996 \ 2997 develop(intx, CIStartOSR, 0, \ 2998 "the id of the first osr compilation to permit " \ 2999 "(CICountOSR must be on)") \ 3000 \ 3001 develop(intx, CIStopOSR, -1, \ 3002 "the id of the last osr compilation to permit " \ 3003 "(CICountOSR must be on)") \ 3004 \ 3005 develop(intx, CIBreakAtOSR, -1, \ 3006 "id of osr compilation to break at") \ 3007 \ 3008 develop(intx, CIBreakAt, -1, \ 3009 "id of compilation to break at") \ 3010 \ 3011 product(ccstrlist, CompileOnly, "", \ 3012 "List of methods (pkg/class.name) to restrict compilation to") \ 3013 \ 3014 product(ccstr, CompileCommandFile, NULL, \ 3015 "Read compiler commands from this file [.hotspot_compiler]") \ 3016 \ 3017 product(ccstrlist, CompileCommand, "", \ 3018 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3019 \ 3020 product(bool, CICompilerCountPerCPU, false, \ 3021 "1 compiler thread for log(N CPUs)") \ 3022 \ 3023 develop(intx, CIFireOOMAt, -1, \ 3024 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3025 "(non-negative value throws OOM after this many CI accesses " \ 3026 "in each compile)") \ 3027 \ 3028 develop(intx, CIFireOOMAtDelay, -1, \ 3029 "Wait for this many CI accesses to occur in all compiles before " \ 3030 "beginning to throw OutOfMemoryErrors in each compile") \ 3031 \ 3032 /* Priorities */ \ 3033 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3034 \ 3035 product(intx, ThreadPriorityPolicy, 0, \ 3036 "0 : Normal. "\ 3037 " VM chooses priorities that are appropriate for normal "\ 3038 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3039 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3040 " map to lower native priority values. On Windows applications"\ 3041 " are allowed to use higher native priorities. However, with "\ 3042 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3043 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3044 " interfere with system threads. On Linux thread priorities "\ 3045 " are ignored because the OS does not support static priority "\ 3046 " in SCHED_OTHER scheduling class which is the only choice for"\ 3047 " non-root, non-realtime applications. "\ 3048 "1 : Aggressive. "\ 3049 " Java thread priorities map over to the entire range of "\ 3050 " native thread priorities. Higher Java thread priorities map "\ 3051 " to higher native thread priorities. This policy should be "\ 3052 " used with care, as sometimes it can cause performance "\ 3053 " degradation in the application and/or the entire system. On "\ 3054 " Linux this policy requires root privilege.") \ 3055 \ 3056 product(bool, ThreadPriorityVerbose, false, \ 3057 "print priority changes") \ 3058 \ 3059 product(intx, DefaultThreadPriority, -1, \ 3060 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3061 \ 3062 product(intx, CompilerThreadPriority, -1, \ 3063 "what priority should compiler threads run at (-1 means no change)") \ 3064 \ 3065 product(intx, VMThreadPriority, -1, \ 3066 "what priority should VM threads run at (-1 means no change)") \ 3067 \ 3068 product(bool, CompilerThreadHintNoPreempt, true, \ 3069 "(Solaris only) Give compiler threads an extra quanta") \ 3070 \ 3071 product(bool, VMThreadHintNoPreempt, false, \ 3072 "(Solaris only) Give VM thread an extra quanta") \ 3073 \ 3074 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3075 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3076 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3077 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3078 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3079 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3080 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3081 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3082 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3083 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3084 \ 3085 /* compiler debugging */ \ 3086 notproduct(intx, CompileTheWorldStartAt, 1, \ 3087 "First class to consider when using +CompileTheWorld") \ 3088 \ 3089 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3090 "Last class to consider when using +CompileTheWorld") \ 3091 \ 3092 develop(intx, NewCodeParameter, 0, \ 3093 "Testing Only: Create a dedicated integer parameter before " \ 3094 "putback") \ 3095 \ 3096 /* new oopmap storage allocation */ \ 3097 develop(intx, MinOopMapAllocation, 8, \ 3098 "Minimum number of OopMap entries in an OopMapSet") \ 3099 \ 3100 /* Background Compilation */ \ 3101 develop(intx, LongCompileThreshold, 50, \ 3102 "Used with +TraceLongCompiles") \ 3103 \ 3104 product(intx, StarvationMonitorInterval, 200, \ 3105 "Pause between each check in ms") \ 3106 \ 3107 /* recompilation */ \ 3108 product_pd(intx, CompileThreshold, \ 3109 "number of interpreted method invocations before (re-)compiling") \ 3110 \ 3111 product_pd(intx, BackEdgeThreshold, \ 3112 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3113 \ 3114 product(intx, Tier1BytecodeLimit, 10, \ 3115 "Must have at least this many bytecodes before tier1" \ 3116 "invocation counters are used") \ 3117 \ 3118 product_pd(intx, Tier2CompileThreshold, \ 3119 "threshold at which a tier 2 compilation is invoked") \ 3120 \ 3121 product_pd(intx, Tier2BackEdgeThreshold, \ 3122 "Back edge threshold at which a tier 2 compilation is invoked") \ 3123 \ 3124 product_pd(intx, Tier3CompileThreshold, \ 3125 "threshold at which a tier 3 compilation is invoked") \ 3126 \ 3127 product_pd(intx, Tier3BackEdgeThreshold, \ 3128 "Back edge threshold at which a tier 3 compilation is invoked") \ 3129 \ 3130 product_pd(intx, Tier4CompileThreshold, \ 3131 "threshold at which a tier 4 compilation is invoked") \ 3132 \ 3133 product_pd(intx, Tier4BackEdgeThreshold, \ 3134 "Back edge threshold at which a tier 4 compilation is invoked") \ 3135 \ 3136 product_pd(bool, TieredCompilation, \ 3137 "Enable two-tier compilation") \ 3138 \ 3139 product(bool, StressTieredRuntime, false, \ 3140 "Alternate client and server compiler on compile requests") \ 3141 \ 3142 product_pd(intx, OnStackReplacePercentage, \ 3143 "NON_TIERED number of method invocations/branches (expressed as %"\ 3144 "of CompileThreshold) before (re-)compiling OSR code") \ 3145 \ 3146 product(intx, InterpreterProfilePercentage, 33, \ 3147 "NON_TIERED number of method invocations/branches (expressed as %"\ 3148 "of CompileThreshold) before profiling in the interpreter") \ 3149 \ 3150 develop(intx, MaxRecompilationSearchLength, 10, \ 3151 "max. # frames to inspect searching for recompilee") \ 3152 \ 3153 develop(intx, MaxInterpretedSearchLength, 3, \ 3154 "max. # interp. frames to skip when searching for recompilee") \ 3155 \ 3156 develop(intx, DesiredMethodLimit, 8000, \ 3157 "desired max. method size (in bytecodes) after inlining") \ 3158 \ 3159 develop(intx, HugeMethodLimit, 8000, \ 3160 "don't compile methods larger than this if " \ 3161 "+DontCompileHugeMethods") \ 3162 \ 3163 /* New JDK 1.4 reflection implementation */ \ 3164 \ 3165 develop(bool, UseNewReflection, true, \ 3166 "Temporary flag for transition to reflection based on dynamic " \ 3167 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3168 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3169 "changes were needed") \ 3170 \ 3171 develop(bool, VerifyReflectionBytecodes, false, \ 3172 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3173 "in situations like that described in 4486457 or for " \ 3174 "constructors generated for serialization, so can not be enabled "\ 3175 "in product.") \ 3176 \ 3177 product(bool, ReflectionWrapResolutionErrors, true, \ 3178 "Temporary flag for transition to AbstractMethodError wrapped " \ 3179 "in InvocationTargetException. See 6531596") \ 3180 \ 3181 \ 3182 develop(intx, FastSuperclassLimit, 8, \ 3183 "Depth of hardwired instanceof accelerator array") \ 3184 \ 3185 /* Properties for Java libraries */ \ 3186 \ 3187 product(intx, MaxDirectMemorySize, -1, \ 3188 "Maximum total size of NIO direct-buffer allocations") \ 3189 \ 3190 /* temporary developer defined flags */ \ 3191 \ 3192 diagnostic(bool, UseNewCode, false, \ 3193 "Testing Only: Use the new version while testing") \ 3194 \ 3195 diagnostic(bool, UseNewCode2, false, \ 3196 "Testing Only: Use the new version while testing") \ 3197 \ 3198 diagnostic(bool, UseNewCode3, false, \ 3199 "Testing Only: Use the new version while testing") \ 3200 \ 3201 /* flags for performance data collection */ \ 3202 \ 3203 product(bool, UsePerfData, true, \ 3204 "Flag to disable jvmstat instrumentation for performance testing" \ 3205 "and problem isolation purposes.") \ 3206 \ 3207 product(bool, PerfDataSaveToFile, false, \ 3208 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3209 \ 3210 product(ccstr, PerfDataSaveFile, NULL, \ 3211 "Save PerfData memory to the specified absolute pathname," \ 3212 "%p in the file name if present will be replaced by pid") \ 3213 \ 3214 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3215 "Data sampling interval in milliseconds") \ 3216 \ 3217 develop(bool, PerfTraceDataCreation, false, \ 3218 "Trace creation of Performance Data Entries") \ 3219 \ 3220 develop(bool, PerfTraceMemOps, false, \ 3221 "Trace PerfMemory create/attach/detach calls") \ 3222 \ 3223 product(bool, PerfDisableSharedMem, false, \ 3224 "Store performance data in standard memory") \ 3225 \ 3226 product(intx, PerfDataMemorySize, 32*K, \ 3227 "Size of performance data memory region. Will be rounded " \ 3228 "up to a multiple of the native os page size.") \ 3229 \ 3230 product(intx, PerfMaxStringConstLength, 1024, \ 3231 "Maximum PerfStringConstant string length before truncation") \ 3232 \ 3233 product(bool, PerfAllowAtExitRegistration, false, \ 3234 "Allow registration of atexit() methods") \ 3235 \ 3236 product(bool, PerfBypassFileSystemCheck, false, \ 3237 "Bypass Win32 file system criteria checks (Windows Only)") \ 3238 \ 3239 product(intx, UnguardOnExecutionViolation, 0, \ 3240 "Unguard page and retry on no-execute fault (Win32 only)" \ 3241 "0=off, 1=conservative, 2=aggressive") \ 3242 \ 3243 /* Serviceability Support */ \ 3244 \ 3245 product(bool, ManagementServer, false, \ 3246 "Create JMX Management Server") \ 3247 \ 3248 product(bool, DisableAttachMechanism, false, \ 3249 "Disable mechanism that allows tools to attach to this VM") \ 3250 \ 3251 product(bool, StartAttachListener, false, \ 3252 "Always start Attach Listener at VM startup") \ 3253 \ 3254 manageable(bool, PrintConcurrentLocks, false, \ 3255 "Print java.util.concurrent locks in thread dump") \ 3256 \ 3257 /* Shared spaces */ \ 3258 \ 3259 product(bool, UseSharedSpaces, true, \ 3260 "Use shared spaces in the permanent generation") \ 3261 \ 3262 product(bool, RequireSharedSpaces, false, \ 3263 "Require shared spaces in the permanent generation") \ 3264 \ 3265 product(bool, ForceSharedSpaces, false, \ 3266 "Require shared spaces in the permanent generation") \ 3267 \ 3268 product(bool, DumpSharedSpaces, false, \ 3269 "Special mode: JVM reads a class list, loads classes, builds " \ 3270 "shared spaces, and dumps the shared spaces to a file to be " \ 3271 "used in future JVM runs.") \ 3272 \ 3273 product(bool, PrintSharedSpaces, false, \ 3274 "Print usage of shared spaces") \ 3275 \ 3276 product(uintx, SharedDummyBlockSize, 512*M, \ 3277 "Size of dummy block used to shift heap addresses (in bytes)") \ 3278 \ 3279 product(uintx, SharedReadWriteSize, 12*M, \ 3280 "Size of read-write space in permanent generation (in bytes)") \ 3281 \ 3282 product(uintx, SharedReadOnlySize, 8*M, \ 3283 "Size of read-only space in permanent generation (in bytes)") \ 3284 \ 3285 product(uintx, SharedMiscDataSize, 4*M, \ 3286 "Size of the shared data area adjacent to the heap (in bytes)") \ 3287 \ 3288 product(uintx, SharedMiscCodeSize, 4*M, \ 3289 "Size of the shared code area adjacent to the heap (in bytes)") \ 3290 \ 3291 diagnostic(bool, SharedOptimizeColdStart, true, \ 3292 "At dump time, order shared objects to achieve better " \ 3293 "cold startup time.") \ 3294 \ 3295 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3296 "Reordering policy for SharedOptimizeColdStart " \ 3297 "0=favor classload-time locality, 1=balanced, " \ 3298 "2=favor runtime locality") \ 3299 \ 3300 diagnostic(bool, SharedSkipVerify, false, \ 3301 "Skip assert() and verify() which page-in unwanted shared " \ 3302 "objects. ") \ 3303 \ 3304 product(bool, AnonymousClasses, false, \ 3305 "support sun.misc.Unsafe.defineAnonymousClass") \ 3306 \ 3307 product(bool, EnableMethodHandles, false, \ 3308 "support method handles (true by default under JSR 292)") \ 3309 \ 3310 diagnostic(intx, MethodHandlePushLimit, 3, \ 3311 "number of additional stack slots a method handle may push") \ 3312 \ 3313 develop(bool, TraceMethodHandles, false, \ 3314 "trace internal method handle operations") \ 3315 \ 3316 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3317 "perform extra checks when constructing method handles") \ 3318 \ 3319 diagnostic(bool, OptimizeMethodHandles, true, \ 3320 "when constructing method handles, try to improve them") \ 3321 \ 3322 product(bool, EnableInvokeDynamic, false, \ 3323 "recognize the invokedynamic instruction") \ 3324 \ 3325 develop(bool, TraceInvokeDynamic, false, \ 3326 "trace internal invoke dynamic operations") \ 3327 \ 3328 product(bool, TaggedStackInterpreter, false, \ 3329 "Insert tags in interpreter execution stack for oopmap generaion")\ 3330 \ 3331 diagnostic(bool, PauseAtStartup, false, \ 3332 "Causes the VM to pause at startup time and wait for the pause " \ 3333 "file to be removed (default: ./vm.paused.<pid>)") \ 3334 \ 3335 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3336 "The file to create and for whose removal to await when pausing " \ 3337 "at startup. (default: ./vm.paused.<pid>)") \ 3338 \ 3339 product(bool, ExtendedDTraceProbes, false, \ 3340 "Enable performance-impacting dtrace probes") \ 3341 \ 3342 product(bool, DTraceMethodProbes, false, \ 3343 "Enable dtrace probes for method-entry and method-exit") \ 3344 \ 3345 product(bool, DTraceAllocProbes, false, \ 3346 "Enable dtrace probes for object allocation") \ 3347 \ 3348 product(bool, DTraceMonitorProbes, false, \ 3349 "Enable dtrace probes for monitor events") \ 3350 \ 3351 product(bool, RelaxAccessControlCheck, false, \ 3352 "Relax the access control checks in the verifier") \ 3353 \ 3354 diagnostic(bool, PrintDTraceDOF, false, \ 3355 "Print the DTrace DOF passed to the system for JSDT probes") \ 3356 \ 3357 product(bool, UseVMInterruptibleIO, false, \ 3358 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3359 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3360 " of this flag is true for JDK 6 and earliers") 3361 3362 3363/* 3364 * Macros for factoring of globals 3365 */ 3366 3367// Interface macros 3368#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3369#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3370#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3371#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3372#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3373#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3374#ifdef PRODUCT 3375#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3376#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3377#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3378#else 3379#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3380#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3381#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3382#endif 3383// Special LP64 flags, product only needed for now. 3384#ifdef _LP64 3385#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3386#else 3387#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3388#endif // _LP64 3389 3390// Implementation macros 3391#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3392#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3393#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3394#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3395#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3396#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3397#ifdef PRODUCT 3398#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3399#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3400#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3401#else 3402#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3403#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3404#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3405#endif 3406#ifdef _LP64 3407#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3408#else 3409#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3410#endif // _LP64 3411 3412RUNTIME_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) 3413 3414RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3415