globals.hpp revision 993:54b3b351d6f9
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(intx, ScavengeRootsInCode, 0, \ 718 "0: do not allow scavengable oops in the code cache; " \ 719 "1: allow scavenging from the code cache; " \ 720 "2: emit as many constants as the compiler can see") \ 721 \ 722 diagnostic(bool, TraceOSRBreakpoint, false, \ 723 "Trace OSR Breakpoint ") \ 724 \ 725 diagnostic(bool, TraceCompileTriggered, false, \ 726 "Trace compile triggered") \ 727 \ 728 diagnostic(bool, TraceTriggers, false, \ 729 "Trace triggers") \ 730 \ 731 product(bool, AlwaysRestoreFPU, false, \ 732 "Restore the FPU control word after every JNI call (expensive)") \ 733 \ 734 notproduct(bool, PrintCompilation2, false, \ 735 "Print additional statistics per compilation") \ 736 \ 737 diagnostic(bool, PrintAdapterHandlers, false, \ 738 "Print code generated for i2c/c2i adapters") \ 739 \ 740 diagnostic(bool, PrintAssembly, false, \ 741 "Print assembly code (using external disassembler.so)") \ 742 \ 743 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 744 "Options string passed to disassembler.so") \ 745 \ 746 diagnostic(bool, PrintNMethods, false, \ 747 "Print assembly code for nmethods when generated") \ 748 \ 749 diagnostic(bool, PrintNativeNMethods, false, \ 750 "Print assembly code for native nmethods when generated") \ 751 \ 752 develop(bool, PrintDebugInfo, false, \ 753 "Print debug information for all nmethods when generated") \ 754 \ 755 develop(bool, PrintRelocations, false, \ 756 "Print relocation information for all nmethods when generated") \ 757 \ 758 develop(bool, PrintDependencies, false, \ 759 "Print dependency information for all nmethods when generated") \ 760 \ 761 develop(bool, PrintExceptionHandlers, false, \ 762 "Print exception handler tables for all nmethods when generated") \ 763 \ 764 develop(bool, InterceptOSException, false, \ 765 "Starts debugger when an implicit OS (e.g., NULL) " \ 766 "exception happens") \ 767 \ 768 notproduct(bool, PrintCodeCache, false, \ 769 "Print the compiled_code cache when exiting") \ 770 \ 771 develop(bool, PrintCodeCache2, false, \ 772 "Print detailed info on the compiled_code cache when exiting") \ 773 \ 774 diagnostic(bool, PrintStubCode, false, \ 775 "Print generated stub code") \ 776 \ 777 product(bool, StackTraceInThrowable, true, \ 778 "Collect backtrace in throwable when exception happens") \ 779 \ 780 product(bool, OmitStackTraceInFastThrow, true, \ 781 "Omit backtraces for some 'hot' exceptions in optimized code") \ 782 \ 783 product(bool, ProfilerPrintByteCodeStatistics, false, \ 784 "Prints byte code statictics when dumping profiler output") \ 785 \ 786 product(bool, ProfilerRecordPC, false, \ 787 "Collects tick for each 16 byte interval of compiled code") \ 788 \ 789 product(bool, ProfileVM, false, \ 790 "Profiles ticks that fall within VM (either in the VM Thread " \ 791 "or VM code called through stubs)") \ 792 \ 793 product(bool, ProfileIntervals, false, \ 794 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 795 \ 796 notproduct(bool, ProfilerCheckIntervals, false, \ 797 "Collect and print info on spacing of profiler ticks") \ 798 \ 799 develop(bool, PrintJVMWarnings, false, \ 800 "Prints warnings for unimplemented JVM functions") \ 801 \ 802 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 803 "Prints warnings for stalled SpinLocks") \ 804 \ 805 develop(bool, InitializeJavaLangSystem, true, \ 806 "Initialize java.lang.System - turn off for individual " \ 807 "method debugging") \ 808 \ 809 develop(bool, InitializeJavaLangString, true, \ 810 "Initialize java.lang.String - turn off for individual " \ 811 "method debugging") \ 812 \ 813 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 814 "Initialize various error and exception classes - turn off for " \ 815 "individual method debugging") \ 816 \ 817 product(bool, RegisterFinalizersAtInit, true, \ 818 "Register finalizable objects at end of Object.<init> or " \ 819 "after allocation.") \ 820 \ 821 develop(bool, RegisterReferences, true, \ 822 "Tells whether the VM should register soft/weak/final/phantom " \ 823 "references") \ 824 \ 825 develop(bool, IgnoreRewrites, false, \ 826 "Supress rewrites of bytecodes in the oopmap generator. " \ 827 "This is unsafe!") \ 828 \ 829 develop(bool, PrintCodeCacheExtension, false, \ 830 "Print extension of code cache") \ 831 \ 832 develop(bool, UsePrivilegedStack, true, \ 833 "Enable the security JVM functions") \ 834 \ 835 develop(bool, IEEEPrecision, true, \ 836 "Enables IEEE precision (for INTEL only)") \ 837 \ 838 develop(bool, ProtectionDomainVerification, true, \ 839 "Verifies protection domain before resolution in system " \ 840 "dictionary") \ 841 \ 842 product(bool, ClassUnloading, true, \ 843 "Do unloading of classes") \ 844 \ 845 diagnostic(bool, LinkWellKnownClasses, false, \ 846 "Resolve a well known class as soon as its name is seen") \ 847 \ 848 develop(bool, DisableStartThread, false, \ 849 "Disable starting of additional Java threads " \ 850 "(for debugging only)") \ 851 \ 852 develop(bool, MemProfiling, false, \ 853 "Write memory usage profiling to log file") \ 854 \ 855 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 856 "Prints the system dictionary at exit") \ 857 \ 858 diagnostic(bool, UnsyncloadClass, false, \ 859 "Unstable: VM calls loadClass unsynchronized. Custom " \ 860 "class loader must call VM synchronized for findClass " \ 861 "and defineClass.") \ 862 \ 863 product(bool, AlwaysLockClassLoader, false, \ 864 "Require the VM to acquire the class loader lock before calling " \ 865 "loadClass() even for class loaders registering " \ 866 "as parallel capable. Default false. ") \ 867 \ 868 product(bool, AllowParallelDefineClass, false, \ 869 "Allow parallel defineClass requests for class loaders " \ 870 "registering as parallel capable. Default false") \ 871 \ 872 product(bool, MustCallLoadClassInternal, false, \ 873 "Call loadClassInternal() rather than loadClass().Default false") \ 874 \ 875 product_pd(bool, DontYieldALot, \ 876 "Throw away obvious excess yield calls (for SOLARIS only)") \ 877 \ 878 product_pd(bool, ConvertSleepToYield, \ 879 "Converts sleep(0) to thread yield " \ 880 "(may be off for SOLARIS to improve GUI)") \ 881 \ 882 product(bool, ConvertYieldToSleep, false, \ 883 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 884 "behavior (SOLARIS only)") \ 885 \ 886 product(bool, UseBoundThreads, true, \ 887 "Bind user level threads to kernel threads (for SOLARIS only)") \ 888 \ 889 develop(bool, UseDetachedThreads, true, \ 890 "Use detached threads that are recycled upon termination " \ 891 "(for SOLARIS only)") \ 892 \ 893 product(bool, UseLWPSynchronization, true, \ 894 "Use LWP-based instead of libthread-based synchronization " \ 895 "(SPARC only)") \ 896 \ 897 product(ccstr, SyncKnobs, NULL, \ 898 "(Unstable) Various monitor synchronization tunables") \ 899 \ 900 product(intx, EmitSync, 0, \ 901 "(Unsafe,Unstable) " \ 902 " Controls emission of inline sync fast-path code") \ 903 \ 904 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 905 \ 906 product(intx, Atomics, 0, \ 907 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 908 \ 909 product(intx, FenceInstruction, 0, \ 910 "(Unsafe,Unstable) Experimental") \ 911 \ 912 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 913 \ 914 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 915 \ 916 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 917 \ 918 product(intx, hashCode, 0, \ 919 "(Unstable) select hashCode generation algorithm" ) \ 920 \ 921 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 922 "(Unstable, Linux-specific)" \ 923 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 924 \ 925 product(bool, FilterSpuriousWakeups , true, \ 926 "Prevent spurious or premature wakeups from object.wait" \ 927 "(Solaris only)") \ 928 \ 929 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 930 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 931 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 932 \ 933 develop(bool, UsePthreads, false, \ 934 "Use pthread-based instead of libthread-based synchronization " \ 935 "(SPARC only)") \ 936 \ 937 product(bool, AdjustConcurrency, false, \ 938 "call thr_setconcurrency at thread create time to avoid " \ 939 "LWP starvation on MP systems (For Solaris Only)") \ 940 \ 941 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 942 "Should the system attempt to update the compiler file when " \ 943 "an error occurs?") \ 944 \ 945 product(bool, ReduceSignalUsage, false, \ 946 "Reduce the use of OS signals in Java and/or the VM") \ 947 \ 948 notproduct(bool, ValidateMarkSweep, false, \ 949 "Do extra validation during MarkSweep collection") \ 950 \ 951 notproduct(bool, RecordMarkSweepCompaction, false, \ 952 "Enable GC-to-GC recording and querying of compaction during " \ 953 "MarkSweep") \ 954 \ 955 develop_pd(bool, ShareVtableStubs, \ 956 "Share vtable stubs (smaller code but worse branch prediction") \ 957 \ 958 develop(bool, LoadLineNumberTables, true, \ 959 "Tells whether the class file parser loads line number tables") \ 960 \ 961 develop(bool, LoadLocalVariableTables, true, \ 962 "Tells whether the class file parser loads local variable tables")\ 963 \ 964 develop(bool, LoadLocalVariableTypeTables, true, \ 965 "Tells whether the class file parser loads local variable type tables")\ 966 \ 967 product(bool, AllowUserSignalHandlers, false, \ 968 "Do not complain if the application installs signal handlers " \ 969 "(Solaris & Linux only)") \ 970 \ 971 product(bool, UseSignalChaining, true, \ 972 "Use signal-chaining to invoke signal handlers installed " \ 973 "by the application (Solaris & Linux only)") \ 974 \ 975 product(bool, UseAltSigs, false, \ 976 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 977 "internal signals. (Solaris only)") \ 978 \ 979 product(bool, UseSpinning, false, \ 980 "Use spinning in monitor inflation and before entry") \ 981 \ 982 product(bool, PreSpinYield, false, \ 983 "Yield before inner spinning loop") \ 984 \ 985 product(bool, PostSpinYield, true, \ 986 "Yield after inner spinning loop") \ 987 \ 988 product(bool, AllowJNIEnvProxy, false, \ 989 "Allow JNIEnv proxies for jdbx") \ 990 \ 991 product(bool, JNIDetachReleasesMonitors, true, \ 992 "JNI DetachCurrentThread releases monitors owned by thread") \ 993 \ 994 product(bool, RestoreMXCSROnJNICalls, false, \ 995 "Restore MXCSR when returning from JNI calls") \ 996 \ 997 product(bool, CheckJNICalls, false, \ 998 "Verify all arguments to JNI calls") \ 999 \ 1000 product(bool, UseFastJNIAccessors, true, \ 1001 "Use optimized versions of Get<Primitive>Field") \ 1002 \ 1003 product(bool, EagerXrunInit, false, \ 1004 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1005 " but not all -Xrun libraries may support the state of the VM at this time") \ 1006 \ 1007 product(bool, PreserveAllAnnotations, false, \ 1008 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1009 \ 1010 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1011 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1012 \ 1013 product(bool, LazyBootClassLoader, true, \ 1014 "Enable/disable lazy opening of boot class path entries") \ 1015 \ 1016 diagnostic(bool, UseIncDec, true, \ 1017 "Use INC, DEC instructions on x86") \ 1018 \ 1019 product(bool, UseNewLongLShift, false, \ 1020 "Use optimized bitwise shift left") \ 1021 \ 1022 product(bool, UseStoreImmI16, true, \ 1023 "Use store immediate 16-bits value instruction on x86") \ 1024 \ 1025 product(bool, UseAddressNop, false, \ 1026 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1027 \ 1028 product(bool, UseXmmLoadAndClearUpper, true, \ 1029 "Load low part of XMM register and clear upper part") \ 1030 \ 1031 product(bool, UseXmmRegToRegMoveAll, false, \ 1032 "Copy all XMM register bits when moving value between registers") \ 1033 \ 1034 product(bool, UseXmmI2D, false, \ 1035 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1036 \ 1037 product(bool, UseXmmI2F, false, \ 1038 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1039 \ 1040 product(bool, UseXMMForArrayCopy, false, \ 1041 "Use SSE2 MOVQ instruction for Arraycopy") \ 1042 \ 1043 product(bool, UseUnalignedLoadStores, false, \ 1044 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1045 \ 1046 product(intx, FieldsAllocationStyle, 1, \ 1047 "0 - type based with oops first, 1 - with oops last") \ 1048 \ 1049 product(bool, CompactFields, true, \ 1050 "Allocate nonstatic fields in gaps between previous fields") \ 1051 \ 1052 notproduct(bool, PrintCompactFieldsSavings, false, \ 1053 "Print how many words were saved with CompactFields") \ 1054 \ 1055 product(bool, UseBiasedLocking, true, \ 1056 "Enable biased locking in JVM") \ 1057 \ 1058 product(intx, BiasedLockingStartupDelay, 4000, \ 1059 "Number of milliseconds to wait before enabling biased locking") \ 1060 \ 1061 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1062 "Print statistics of biased locking in JVM") \ 1063 \ 1064 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1065 "Threshold of number of revocations per type to try to " \ 1066 "rebias all objects in the heap of that type") \ 1067 \ 1068 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1069 "Threshold of number of revocations per type to permanently " \ 1070 "revoke biases of all objects in the heap of that type") \ 1071 \ 1072 product(intx, BiasedLockingDecayTime, 25000, \ 1073 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1074 "type after previous bulk rebias") \ 1075 \ 1076 /* tracing */ \ 1077 \ 1078 notproduct(bool, TraceRuntimeCalls, false, \ 1079 "Trace run-time calls") \ 1080 \ 1081 develop(bool, TraceJNICalls, false, \ 1082 "Trace JNI calls") \ 1083 \ 1084 notproduct(bool, TraceJVMCalls, false, \ 1085 "Trace JVM calls") \ 1086 \ 1087 product(ccstr, TraceJVMTI, NULL, \ 1088 "Trace flags for JVMTI functions and events") \ 1089 \ 1090 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1091 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1092 \ 1093 /* This option can change an EMCP method into an obsolete method. */ \ 1094 /* This can affect tests that except specific methods to be EMCP. */ \ 1095 /* This option should be used with caution. */ \ 1096 product(bool, StressLdcRewrite, false, \ 1097 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1098 \ 1099 product(intx, TraceRedefineClasses, 0, \ 1100 "Trace level for JVMTI RedefineClasses") \ 1101 \ 1102 /* change to false by default sometime after Mustang */ \ 1103 product(bool, VerifyMergedCPBytecodes, true, \ 1104 "Verify bytecodes after RedefineClasses constant pool merging") \ 1105 \ 1106 develop(bool, TraceJNIHandleAllocation, false, \ 1107 "Trace allocation/deallocation of JNI handle blocks") \ 1108 \ 1109 develop(bool, TraceThreadEvents, false, \ 1110 "Trace all thread events") \ 1111 \ 1112 develop(bool, TraceBytecodes, false, \ 1113 "Trace bytecode execution") \ 1114 \ 1115 develop(bool, TraceClassInitialization, false, \ 1116 "Trace class initialization") \ 1117 \ 1118 develop(bool, TraceExceptions, false, \ 1119 "Trace exceptions") \ 1120 \ 1121 develop(bool, TraceICs, false, \ 1122 "Trace inline cache changes") \ 1123 \ 1124 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1125 "Trace method invocation counter overflow") \ 1126 \ 1127 develop(bool, TraceInlineCacheClearing, false, \ 1128 "Trace clearing of inline caches in nmethods") \ 1129 \ 1130 develop(bool, TraceDependencies, false, \ 1131 "Trace dependencies") \ 1132 \ 1133 develop(bool, VerifyDependencies, trueInDebug, \ 1134 "Exercise and verify the compilation dependency mechanism") \ 1135 \ 1136 develop(bool, TraceNewOopMapGeneration, false, \ 1137 "Trace OopMapGeneration") \ 1138 \ 1139 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1140 "Trace OopMapGeneration: print detailed cell states") \ 1141 \ 1142 develop(bool, TimeOopMap, false, \ 1143 "Time calls to GenerateOopMap::compute_map() in sum") \ 1144 \ 1145 develop(bool, TimeOopMap2, false, \ 1146 "Time calls to GenerateOopMap::compute_map() individually") \ 1147 \ 1148 develop(bool, TraceMonitorMismatch, false, \ 1149 "Trace monitor matching failures during OopMapGeneration") \ 1150 \ 1151 develop(bool, TraceOopMapRewrites, false, \ 1152 "Trace rewritting of method oops during oop map generation") \ 1153 \ 1154 develop(bool, TraceSafepoint, false, \ 1155 "Trace safepoint operations") \ 1156 \ 1157 develop(bool, TraceICBuffer, false, \ 1158 "Trace usage of IC buffer") \ 1159 \ 1160 develop(bool, TraceCompiledIC, false, \ 1161 "Trace changes of compiled IC") \ 1162 \ 1163 notproduct(bool, TraceZapDeadLocals, false, \ 1164 "Trace zapping dead locals") \ 1165 \ 1166 develop(bool, TraceStartupTime, false, \ 1167 "Trace setup time") \ 1168 \ 1169 develop(bool, TraceHPI, false, \ 1170 "Trace Host Porting Interface (HPI)") \ 1171 \ 1172 product(ccstr, HPILibPath, NULL, \ 1173 "Specify alternate path to HPI library") \ 1174 \ 1175 develop(bool, TraceProtectionDomainVerification, false, \ 1176 "Trace protection domain verifcation") \ 1177 \ 1178 develop(bool, TraceClearedExceptions, false, \ 1179 "Prints when an exception is forcibly cleared") \ 1180 \ 1181 product(bool, TraceClassResolution, false, \ 1182 "Trace all constant pool resolutions (for debugging)") \ 1183 \ 1184 product(bool, TraceBiasedLocking, false, \ 1185 "Trace biased locking in JVM") \ 1186 \ 1187 product(bool, TraceMonitorInflation, false, \ 1188 "Trace monitor inflation in JVM") \ 1189 \ 1190 /* assembler */ \ 1191 product(bool, Use486InstrsOnly, false, \ 1192 "Use 80486 Compliant instruction subset") \ 1193 \ 1194 /* gc */ \ 1195 \ 1196 product(bool, UseSerialGC, false, \ 1197 "Use the serial garbage collector") \ 1198 \ 1199 experimental(bool, UseG1GC, false, \ 1200 "Use the Garbage-First garbage collector") \ 1201 \ 1202 product(bool, UseParallelGC, false, \ 1203 "Use the Parallel Scavenge garbage collector") \ 1204 \ 1205 product(bool, UseParallelOldGC, false, \ 1206 "Use the Parallel Old garbage collector") \ 1207 \ 1208 product(bool, UseParallelOldGCCompacting, true, \ 1209 "In the Parallel Old garbage collector use parallel compaction") \ 1210 \ 1211 product(bool, UseParallelDensePrefixUpdate, true, \ 1212 "In the Parallel Old garbage collector use parallel dense" \ 1213 " prefix update") \ 1214 \ 1215 product(uintx, HeapMaximumCompactionInterval, 20, \ 1216 "How often should we maximally compact the heap (not allowing " \ 1217 "any dead space)") \ 1218 \ 1219 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1220 "The collection count for the first maximum compaction") \ 1221 \ 1222 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1223 "In the Parallel Old garbage collector maximum compaction for " \ 1224 "a system GC") \ 1225 \ 1226 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1227 "The mean used by the par compact dead wood" \ 1228 "limiter (a number between 0-100).") \ 1229 \ 1230 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1231 "The standard deviation used by the par compact dead wood" \ 1232 "limiter (a number between 0-100).") \ 1233 \ 1234 product(bool, UseParallelOldGCDensePrefix, true, \ 1235 "Use a dense prefix with the Parallel Old garbage collector") \ 1236 \ 1237 product(uintx, ParallelGCThreads, 0, \ 1238 "Number of parallel threads parallel gc will use") \ 1239 \ 1240 product(uintx, ParallelCMSThreads, 0, \ 1241 "Max number of threads CMS will use for concurrent work") \ 1242 \ 1243 develop(bool, ParallelOldGCSplitALot, false, \ 1244 "Provoke splitting (copying data from a young gen space to" \ 1245 "multiple destination spaces)") \ 1246 \ 1247 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1248 "How often to provoke splitting a young gen space") \ 1249 \ 1250 develop(bool, TraceRegionTasksQueuing, false, \ 1251 "Trace the queuing of the region tasks") \ 1252 \ 1253 product(uintx, ParallelMarkingThreads, 0, \ 1254 "Number of marking threads concurrent gc will use") \ 1255 \ 1256 product(uintx, YoungPLABSize, 4096, \ 1257 "Size of young gen promotion labs (in HeapWords)") \ 1258 \ 1259 product(uintx, OldPLABSize, 1024, \ 1260 "Size of old gen promotion labs (in HeapWords)") \ 1261 \ 1262 product(uintx, GCTaskTimeStampEntries, 200, \ 1263 "Number of time stamp entries per gc worker thread") \ 1264 \ 1265 product(bool, AlwaysTenure, false, \ 1266 "Always tenure objects in eden. (ParallelGC only)") \ 1267 \ 1268 product(bool, NeverTenure, false, \ 1269 "Never tenure objects in eden, May tenure on overflow" \ 1270 " (ParallelGC only)") \ 1271 \ 1272 product(bool, ScavengeBeforeFullGC, true, \ 1273 "Scavenge youngest generation before each full GC," \ 1274 " used with UseParallelGC") \ 1275 \ 1276 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1277 "Allow scavenges to occur when to_space contains objects.") \ 1278 \ 1279 product(bool, UseConcMarkSweepGC, false, \ 1280 "Use Concurrent Mark-Sweep GC in the old generation") \ 1281 \ 1282 product(bool, ExplicitGCInvokesConcurrent, false, \ 1283 "A System.gc() request invokes a concurrent collection;" \ 1284 " (effective only when UseConcMarkSweepGC)") \ 1285 \ 1286 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1287 "A System.gc() request invokes a concurrent collection and" \ 1288 " also unloads classes during such a concurrent gc cycle " \ 1289 " (effective only when UseConcMarkSweepGC)") \ 1290 \ 1291 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1292 "Use Adaptive Free Lists in the CMS generation") \ 1293 \ 1294 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1295 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1296 \ 1297 develop(bool, RotateCMSCollectionTypes, false, \ 1298 "Rotate the CMS collections among concurrent and STW") \ 1299 \ 1300 product(bool, UseCMSBestFit, true, \ 1301 "Use CMS best fit allocation strategy") \ 1302 \ 1303 product(bool, UseCMSCollectionPassing, true, \ 1304 "Use passing of collection from background to foreground") \ 1305 \ 1306 product(bool, UseParNewGC, false, \ 1307 "Use parallel threads in the new generation.") \ 1308 \ 1309 product(bool, ParallelGCVerbose, false, \ 1310 "Verbose output for parallel GC.") \ 1311 \ 1312 product(intx, ParallelGCBufferWastePct, 10, \ 1313 "wasted fraction of parallel allocation buffer.") \ 1314 \ 1315 product(bool, ParallelGCRetainPLAB, true, \ 1316 "Retain parallel allocation buffers across scavenges.") \ 1317 \ 1318 product(intx, TargetPLABWastePct, 10, \ 1319 "target wasted space in last buffer as pct of overall allocation")\ 1320 \ 1321 product(uintx, PLABWeight, 75, \ 1322 "Percentage (0-100) used to weight the current sample when" \ 1323 "computing exponentially decaying average for ResizePLAB.") \ 1324 \ 1325 product(bool, ResizePLAB, true, \ 1326 "Dynamically resize (survivor space) promotion labs") \ 1327 \ 1328 product(bool, PrintPLAB, false, \ 1329 "Print (survivor space) promotion labs sizing decisions") \ 1330 \ 1331 product(intx, ParGCArrayScanChunk, 50, \ 1332 "Scan a subset and push remainder, if array is bigger than this") \ 1333 \ 1334 product(bool, ParGCUseLocalOverflow, false, \ 1335 "Instead of a global overflow list, use local overflow stacks") \ 1336 \ 1337 product(bool, ParGCTrimOverflow, true, \ 1338 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1339 \ 1340 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1341 "Whether we should simulate work queue overflow in ParNew") \ 1342 \ 1343 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1344 "An `interval' counter that determines how frequently" \ 1345 " we simulate overflow; a smaller number increases frequency") \ 1346 \ 1347 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1348 "The desired number of objects to claim from the overflow list") \ 1349 \ 1350 product(uintx, CMSParPromoteBlocksToClaim, 50, \ 1351 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1352 "parallel GC.") \ 1353 \ 1354 product(bool, AlwaysPreTouch, false, \ 1355 "It forces all freshly committed pages to be pre-touched.") \ 1356 \ 1357 product(bool, CMSUseOldDefaults, false, \ 1358 "A flag temporarily introduced to allow reverting to some older" \ 1359 "default settings; older as of 6.0 ") \ 1360 \ 1361 product(intx, CMSYoungGenPerWorker, 16*M, \ 1362 "The amount of young gen chosen by default per GC worker " \ 1363 "thread available ") \ 1364 \ 1365 product(bool, GCOverheadReporting, false, \ 1366 "Enables the GC overhead reporting facility") \ 1367 \ 1368 product(intx, GCOverheadReportingPeriodMS, 100, \ 1369 "Reporting period for conc GC overhead reporting, in ms ") \ 1370 \ 1371 product(bool, CMSIncrementalMode, false, \ 1372 "Whether CMS GC should operate in \"incremental\" mode") \ 1373 \ 1374 product(uintx, CMSIncrementalDutyCycle, 10, \ 1375 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1376 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1377 "value") \ 1378 \ 1379 product(bool, CMSIncrementalPacing, true, \ 1380 "Whether the CMS incremental mode duty cycle should be " \ 1381 "automatically adjusted") \ 1382 \ 1383 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1384 "Lower bound on the duty cycle when CMSIncrementalPacing is" \ 1385 "enabled (a percentage, 0-100).") \ 1386 \ 1387 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1388 "Percentage (0-100) used to add conservatism when computing the" \ 1389 "duty cycle.") \ 1390 \ 1391 product(uintx, CMSIncrementalOffset, 0, \ 1392 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1393 "is shifted to the right within the period between young GCs") \ 1394 \ 1395 product(uintx, CMSExpAvgFactor, 25, \ 1396 "Percentage (0-100) used to weight the current sample when" \ 1397 "computing exponential averages for CMS statistics.") \ 1398 \ 1399 product(uintx, CMS_FLSWeight, 50, \ 1400 "Percentage (0-100) used to weight the current sample when" \ 1401 "computing exponentially decating averages for CMS FLS statistics.") \ 1402 \ 1403 product(uintx, CMS_FLSPadding, 2, \ 1404 "The multiple of deviation from mean to use for buffering" \ 1405 "against volatility in free list demand.") \ 1406 \ 1407 product(uintx, FLSCoalescePolicy, 2, \ 1408 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1409 \ 1410 product(uintx, CMS_SweepWeight, 50, \ 1411 "Percentage (0-100) used to weight the current sample when" \ 1412 "computing exponentially decaying average for inter-sweep duration.") \ 1413 \ 1414 product(uintx, CMS_SweepPadding, 2, \ 1415 "The multiple of deviation from mean to use for buffering" \ 1416 "against volatility in inter-sweep duration.") \ 1417 \ 1418 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1419 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1420 " duration exceeds this threhold in milliseconds") \ 1421 \ 1422 develop(bool, CMSTraceIncrementalMode, false, \ 1423 "Trace CMS incremental mode") \ 1424 \ 1425 develop(bool, CMSTraceIncrementalPacing, false, \ 1426 "Trace CMS incremental mode pacing computation") \ 1427 \ 1428 develop(bool, CMSTraceThreadState, false, \ 1429 "Trace the CMS thread state (enable the trace_state() method)") \ 1430 \ 1431 product(bool, CMSClassUnloadingEnabled, false, \ 1432 "Whether class unloading enabled when using CMS GC") \ 1433 \ 1434 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1435 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1436 " for which classes may not be unloaded") \ 1437 \ 1438 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1439 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1440 \ 1441 product(bool, UseCMSCompactAtFullCollection, true, \ 1442 "Use mark sweep compact at full collections") \ 1443 \ 1444 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1445 "Number of CMS full collection done before compaction if > 0") \ 1446 \ 1447 develop(intx, CMSDictionaryChoice, 0, \ 1448 "Use BinaryTreeDictionary as default in the CMS generation") \ 1449 \ 1450 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1451 "Replenish and indexed free list with this number of chunks") \ 1452 \ 1453 product(bool, CMSLoopWarn, false, \ 1454 "Warn in case of excessive CMS looping") \ 1455 \ 1456 develop(bool, CMSOverflowEarlyRestoration, false, \ 1457 "Whether preserved marks should be restored early") \ 1458 \ 1459 product(uintx, CMSMarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1460 "Size of CMS marking stack") \ 1461 \ 1462 product(uintx, CMSMarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1463 "Max size of CMS marking stack") \ 1464 \ 1465 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1466 "Whether we should simulate frequent marking stack / work queue" \ 1467 " overflow") \ 1468 \ 1469 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1470 "An `interval' counter that determines how frequently" \ 1471 " we simulate overflow; a smaller number increases frequency") \ 1472 \ 1473 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1474 "(Temporary, subject to experimentation)" \ 1475 "Maximum number of abortable preclean iterations, if > 0") \ 1476 \ 1477 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1478 "(Temporary, subject to experimentation)" \ 1479 "Maximum time in abortable preclean in ms") \ 1480 \ 1481 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1482 "(Temporary, subject to experimentation)" \ 1483 "Nominal minimum work per abortable preclean iteration") \ 1484 \ 1485 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1486 "(Temporary, subject to experimentation)" \ 1487 " Time that we sleep between iterations when not given" \ 1488 " enough work per iteration") \ 1489 \ 1490 product(uintx, CMSRescanMultiple, 32, \ 1491 "Size (in cards) of CMS parallel rescan task") \ 1492 \ 1493 product(uintx, CMSConcMarkMultiple, 32, \ 1494 "Size (in cards) of CMS concurrent MT marking task") \ 1495 \ 1496 product(uintx, CMSRevisitStackSize, 1*M, \ 1497 "Size of CMS KlassKlass revisit stack") \ 1498 \ 1499 product(bool, CMSAbortSemantics, false, \ 1500 "Whether abort-on-overflow semantics is implemented") \ 1501 \ 1502 product(bool, CMSParallelRemarkEnabled, true, \ 1503 "Whether parallel remark enabled (only if ParNewGC)") \ 1504 \ 1505 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1506 "Whether parallel remark of survivor space" \ 1507 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1508 \ 1509 product(bool, CMSPLABRecordAlways, true, \ 1510 "Whether to always record survivor space PLAB bdries" \ 1511 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1512 \ 1513 product(bool, CMSConcurrentMTEnabled, true, \ 1514 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1515 \ 1516 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1517 "Whether concurrent precleaning enabled in perm gen" \ 1518 " (effective only when CMSPrecleaningEnabled is true)") \ 1519 \ 1520 product(bool, CMSPrecleaningEnabled, true, \ 1521 "Whether concurrent precleaning enabled") \ 1522 \ 1523 product(uintx, CMSPrecleanIter, 3, \ 1524 "Maximum number of precleaning iteration passes") \ 1525 \ 1526 product(uintx, CMSPrecleanNumerator, 2, \ 1527 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1528 " ratio") \ 1529 \ 1530 product(uintx, CMSPrecleanDenominator, 3, \ 1531 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1532 " ratio") \ 1533 \ 1534 product(bool, CMSPrecleanRefLists1, true, \ 1535 "Preclean ref lists during (initial) preclean phase") \ 1536 \ 1537 product(bool, CMSPrecleanRefLists2, false, \ 1538 "Preclean ref lists during abortable preclean phase") \ 1539 \ 1540 product(bool, CMSPrecleanSurvivors1, false, \ 1541 "Preclean survivors during (initial) preclean phase") \ 1542 \ 1543 product(bool, CMSPrecleanSurvivors2, true, \ 1544 "Preclean survivors during abortable preclean phase") \ 1545 \ 1546 product(uintx, CMSPrecleanThreshold, 1000, \ 1547 "Don't re-iterate if #dirty cards less than this") \ 1548 \ 1549 product(bool, CMSCleanOnEnter, true, \ 1550 "Clean-on-enter optimization for reducing number of dirty cards") \ 1551 \ 1552 product(uintx, CMSRemarkVerifyVariant, 1, \ 1553 "Choose variant (1,2) of verification following remark") \ 1554 \ 1555 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1556 "If Eden used is below this value, don't try to schedule remark") \ 1557 \ 1558 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1559 "The Eden occupancy % at which to try and schedule remark pause") \ 1560 \ 1561 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1562 "Start sampling Eden top at least before yg occupancy reaches" \ 1563 " 1/<ratio> of the size at which we plan to schedule remark") \ 1564 \ 1565 product(uintx, CMSSamplingGrain, 16*K, \ 1566 "The minimum distance between eden samples for CMS (see above)") \ 1567 \ 1568 product(bool, CMSScavengeBeforeRemark, false, \ 1569 "Attempt scavenge before the CMS remark step") \ 1570 \ 1571 develop(bool, CMSTraceSweeper, false, \ 1572 "Trace some actions of the CMS sweeper") \ 1573 \ 1574 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1575 "Don't drain below this size per parallel worker/thief") \ 1576 \ 1577 product(intx, CMSWaitDuration, 2000, \ 1578 "Time in milliseconds that CMS thread waits for young GC") \ 1579 \ 1580 product(bool, CMSYield, true, \ 1581 "Yield between steps of concurrent mark & sweep") \ 1582 \ 1583 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1584 "Bitmap operations should process at most this many bits" \ 1585 "between yields") \ 1586 \ 1587 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1588 "Verify that all refs across the FLS boundary " \ 1589 " are to valid objects") \ 1590 \ 1591 diagnostic(bool, FLSVerifyLists, false, \ 1592 "Do lots of (expensive) FreeListSpace verification") \ 1593 \ 1594 diagnostic(bool, FLSVerifyIndexTable, false, \ 1595 "Do lots of (expensive) FLS index table verification") \ 1596 \ 1597 develop(bool, FLSVerifyDictionary, false, \ 1598 "Do lots of (expensive) FLS dictionary verification") \ 1599 \ 1600 develop(bool, VerifyBlockOffsetArray, false, \ 1601 "Do (expensive!) block offset array verification") \ 1602 \ 1603 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1604 "Maintain _unallocated_block in BlockOffsetArray" \ 1605 " (currently applicable only to CMS collector)") \ 1606 \ 1607 develop(bool, TraceCMSState, false, \ 1608 "Trace the state of the CMS collection") \ 1609 \ 1610 product(intx, RefDiscoveryPolicy, 0, \ 1611 "Whether reference-based(0) or referent-based(1)") \ 1612 \ 1613 product(bool, ParallelRefProcEnabled, false, \ 1614 "Enable parallel reference processing whenever possible") \ 1615 \ 1616 product(bool, ParallelRefProcBalancingEnabled, true, \ 1617 "Enable balancing of reference processing queues") \ 1618 \ 1619 product(intx, CMSTriggerRatio, 80, \ 1620 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1621 " allocated before a CMS collection cycle commences") \ 1622 \ 1623 product(intx, CMSTriggerPermRatio, 80, \ 1624 "Percentage of MinHeapFreeRatio in the CMS perm generation that" \ 1625 " is allocated before a CMS collection cycle commences, that " \ 1626 " also collects the perm generation") \ 1627 \ 1628 product(uintx, CMSBootstrapOccupancy, 50, \ 1629 "Percentage CMS generation occupancy at which to " \ 1630 " initiate CMS collection for bootstrapping collection stats") \ 1631 \ 1632 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1633 "Percentage CMS generation occupancy to start a CMS collection " \ 1634 " cycle (A negative value means that CMSTriggerRatio is used)") \ 1635 \ 1636 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1637 "Percentage CMS perm generation occupancy to start a CMScollection"\ 1638 " cycle (A negative value means that CMSTriggerPermRatio is used)")\ 1639 \ 1640 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1641 "Only use occupancy as a crierion for starting a CMS collection") \ 1642 \ 1643 product(intx, CMSIsTooFullPercentage, 98, \ 1644 "An absolute ceiling above which CMS will always consider the" \ 1645 " perm gen ripe for collection") \ 1646 \ 1647 develop(bool, CMSTestInFreeList, false, \ 1648 "Check if the coalesced range is already in the " \ 1649 "free lists as claimed.") \ 1650 \ 1651 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1652 "Check that all the garbage collected was returned to the " \ 1653 "free lists.") \ 1654 \ 1655 notproduct(bool, ScavengeALot, false, \ 1656 "Force scavenge at every Nth exit from the runtime system " \ 1657 "(N=ScavengeALotInterval)") \ 1658 \ 1659 develop(bool, FullGCALot, false, \ 1660 "Force full gc at every Nth exit from the runtime system " \ 1661 "(N=FullGCALotInterval)") \ 1662 \ 1663 notproduct(bool, GCALotAtAllSafepoints, false, \ 1664 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1665 \ 1666 product(bool, HandlePromotionFailure, true, \ 1667 "The youngest generation collection does not require" \ 1668 " a guarantee of full promotion of all live objects.") \ 1669 \ 1670 notproduct(bool, PromotionFailureALot, false, \ 1671 "Use promotion failure handling on every youngest generation " \ 1672 "collection") \ 1673 \ 1674 develop(uintx, PromotionFailureALotCount, 1000, \ 1675 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1676 "refill attempts (ParNew) or promotion attempts " \ 1677 "(other young collectors) ") \ 1678 \ 1679 develop(uintx, PromotionFailureALotInterval, 5, \ 1680 "Total collections between promotion failures alot") \ 1681 \ 1682 develop(intx, WorkStealingSleepMillis, 1, \ 1683 "Sleep time when sleep is used for yields") \ 1684 \ 1685 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1686 "Number of yields before a sleep is done during workstealing") \ 1687 \ 1688 develop(uintx, WorkStealingHardSpins, 4096, \ 1689 "Number of iterations in a spin loop between checks on " \ 1690 "time out of hard spin") \ 1691 \ 1692 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1693 "Ratio of hard spins to calls to yield") \ 1694 \ 1695 product(uintx, PreserveMarkStackSize, 1024, \ 1696 "Size for stack used in promotion failure handling") \ 1697 \ 1698 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1699 \ 1700 product_pd(bool, ResizeTLAB, \ 1701 "Dynamically resize tlab size for threads") \ 1702 \ 1703 product(bool, ZeroTLAB, false, \ 1704 "Zero out the newly created TLAB") \ 1705 \ 1706 product(bool, FastTLABRefill, true, \ 1707 "Use fast TLAB refill code") \ 1708 \ 1709 product(bool, PrintTLAB, false, \ 1710 "Print various TLAB related information") \ 1711 \ 1712 product(bool, TLABStats, true, \ 1713 "Print various TLAB related information") \ 1714 \ 1715 product(bool, PrintRevisitStats, false, \ 1716 "Print revisit (klass and MDO) stack related information") \ 1717 \ 1718 product_pd(bool, NeverActAsServerClassMachine, \ 1719 "Never act like a server-class machine") \ 1720 \ 1721 product(bool, AlwaysActAsServerClassMachine, false, \ 1722 "Always act like a server-class machine") \ 1723 \ 1724 product_pd(uintx, DefaultMaxRAM, \ 1725 "Maximum real memory size for setting server class heap size") \ 1726 \ 1727 product(uintx, DefaultMaxRAMFraction, 4, \ 1728 "Fraction (1/n) of real memory used for server class max heap") \ 1729 \ 1730 product(uintx, DefaultInitialRAMFraction, 64, \ 1731 "Fraction (1/n) of real memory used for server class initial heap") \ 1732 \ 1733 product(bool, UseAutoGCSelectPolicy, false, \ 1734 "Use automatic collection selection policy") \ 1735 \ 1736 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1737 "Automatic GC selection pause threshhold in ms") \ 1738 \ 1739 product(bool, UseAdaptiveSizePolicy, true, \ 1740 "Use adaptive generation sizing policies") \ 1741 \ 1742 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1743 "Use adaptive survivor sizing policies") \ 1744 \ 1745 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1746 "Use adaptive young-old sizing policies at minor collections") \ 1747 \ 1748 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1749 "Use adaptive young-old sizing policies at major collections") \ 1750 \ 1751 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1752 "Use statistics from System.GC for adaptive size policy") \ 1753 \ 1754 product(bool, UseAdaptiveGCBoundary, false, \ 1755 "Allow young-old boundary to move") \ 1756 \ 1757 develop(bool, TraceAdaptiveGCBoundary, false, \ 1758 "Trace young-old boundary moves") \ 1759 \ 1760 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1761 "Resize the virtual spaces of the young or old generations") \ 1762 \ 1763 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1764 "Policy for changeing generation size for throughput goals") \ 1765 \ 1766 product(uintx, AdaptiveSizePausePolicy, 0, \ 1767 "Policy for changing generation size for pause goals") \ 1768 \ 1769 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1770 "Adjust tenured generation to achive a minor pause goal") \ 1771 \ 1772 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1773 "Adjust young generation to achive a major pause goal") \ 1774 \ 1775 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1776 "Number of steps where heuristics is used before data is used") \ 1777 \ 1778 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1779 "Number of collections before the adaptive sizing is started") \ 1780 \ 1781 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1782 "Collecton interval for printing information, zero => never") \ 1783 \ 1784 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1785 "Use adaptive minimum footprint as a goal") \ 1786 \ 1787 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1788 "Weight given to exponential resizing, between 0 and 100") \ 1789 \ 1790 product(uintx, AdaptiveTimeWeight, 25, \ 1791 "Weight given to time in adaptive policy, between 0 and 100") \ 1792 \ 1793 product(uintx, PausePadding, 1, \ 1794 "How much buffer to keep for pause time") \ 1795 \ 1796 product(uintx, PromotedPadding, 3, \ 1797 "How much buffer to keep for promotion failure") \ 1798 \ 1799 product(uintx, SurvivorPadding, 3, \ 1800 "How much buffer to keep for survivor overflow") \ 1801 \ 1802 product(uintx, AdaptivePermSizeWeight, 20, \ 1803 "Weight for perm gen exponential resizing, between 0 and 100") \ 1804 \ 1805 product(uintx, PermGenPadding, 3, \ 1806 "How much buffer to keep for perm gen sizing") \ 1807 \ 1808 product(uintx, ThresholdTolerance, 10, \ 1809 "Allowed collection cost difference between generations") \ 1810 \ 1811 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1812 "If collection costs are within margin, reduce both by full delta") \ 1813 \ 1814 product(uintx, YoungGenerationSizeIncrement, 20, \ 1815 "Adaptive size percentage change in young generation") \ 1816 \ 1817 product(uintx, YoungGenerationSizeSupplement, 80, \ 1818 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1819 \ 1820 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1821 "Decay factor to YoungedGenerationSizeSupplement") \ 1822 \ 1823 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1824 "Adaptive size percentage change in tenured generation") \ 1825 \ 1826 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1827 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1828 \ 1829 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1830 "Decay factor to TenuredGenerationSizeIncrement") \ 1831 \ 1832 product(uintx, MaxGCPauseMillis, max_uintx, \ 1833 "Adaptive size policy maximum GC pause time goal in msec, " \ 1834 "or (G1 Only) the max. GC time per MMU time slice") \ 1835 \ 1836 product(intx, GCPauseIntervalMillis, 500, \ 1837 "Time slice for MMU specification") \ 1838 \ 1839 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1840 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1841 \ 1842 product(uintx, GCTimeRatio, 99, \ 1843 "Adaptive size policy application time to GC time ratio") \ 1844 \ 1845 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1846 "Adaptive size scale down factor for shrinking") \ 1847 \ 1848 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1849 "Adaptive size decays the major cost for long major intervals") \ 1850 \ 1851 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1852 "Time scale over which major costs decay") \ 1853 \ 1854 product(uintx, MinSurvivorRatio, 3, \ 1855 "Minimum ratio of young generation/survivor space size") \ 1856 \ 1857 product(uintx, InitialSurvivorRatio, 8, \ 1858 "Initial ratio of eden/survivor space size") \ 1859 \ 1860 product(uintx, BaseFootPrintEstimate, 256*M, \ 1861 "Estimate of footprint other than Java Heap") \ 1862 \ 1863 product(bool, UseGCOverheadLimit, true, \ 1864 "Use policy to limit of proportion of time spent in GC " \ 1865 "before an OutOfMemory error is thrown") \ 1866 \ 1867 product(uintx, GCTimeLimit, 98, \ 1868 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1869 "error is thrown (used with GCHeapFreeLimit)") \ 1870 \ 1871 product(uintx, GCHeapFreeLimit, 2, \ 1872 "Minimum percentage of free space after a full GC before an " \ 1873 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1874 \ 1875 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 1876 "Number of consecutive collections before gc time limit fires") \ 1877 \ 1878 product(bool, PrintAdaptiveSizePolicy, false, \ 1879 "Print information about AdaptiveSizePolicy") \ 1880 \ 1881 product(intx, PrefetchCopyIntervalInBytes, -1, \ 1882 "How far ahead to prefetch destination area (<= 0 means off)") \ 1883 \ 1884 product(intx, PrefetchScanIntervalInBytes, -1, \ 1885 "How far ahead to prefetch scan area (<= 0 means off)") \ 1886 \ 1887 product(intx, PrefetchFieldsAhead, -1, \ 1888 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 1889 \ 1890 develop(bool, UsePrefetchQueue, true, \ 1891 "Use the prefetch queue during PS promotion") \ 1892 \ 1893 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 1894 "Verify system before exiting") \ 1895 \ 1896 diagnostic(bool, VerifyBeforeGC, false, \ 1897 "Verify memory system before GC") \ 1898 \ 1899 diagnostic(bool, VerifyAfterGC, false, \ 1900 "Verify memory system after GC") \ 1901 \ 1902 diagnostic(bool, VerifyDuringGC, false, \ 1903 "Verify memory system during GC (between phases)") \ 1904 \ 1905 diagnostic(bool, GCParallelVerificationEnabled, true, \ 1906 "Enable parallel memory system verification") \ 1907 \ 1908 diagnostic(bool, VerifyRememberedSets, false, \ 1909 "Verify GC remembered sets") \ 1910 \ 1911 diagnostic(bool, VerifyObjectStartArray, true, \ 1912 "Verify GC object start array if verify before/after") \ 1913 \ 1914 product(bool, DisableExplicitGC, false, \ 1915 "Tells whether calling System.gc() does a full GC") \ 1916 \ 1917 notproduct(bool, CheckMemoryInitialization, false, \ 1918 "Checks memory initialization") \ 1919 \ 1920 product(bool, CollectGen0First, false, \ 1921 "Collect youngest generation before each full GC") \ 1922 \ 1923 diagnostic(bool, BindCMSThreadToCPU, false, \ 1924 "Bind CMS Thread to CPU if possible") \ 1925 \ 1926 diagnostic(uintx, CPUForCMSThread, 0, \ 1927 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 1928 \ 1929 product(bool, BindGCTaskThreadsToCPUs, false, \ 1930 "Bind GCTaskThreads to CPUs if possible") \ 1931 \ 1932 product(bool, UseGCTaskAffinity, false, \ 1933 "Use worker affinity when asking for GCTasks") \ 1934 \ 1935 product(uintx, ProcessDistributionStride, 4, \ 1936 "Stride through processors when distributing processes") \ 1937 \ 1938 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 1939 "number of times the coordinator GC thread will sleep while " \ 1940 "yielding before giving up and resuming GC") \ 1941 \ 1942 product(uintx, CMSYieldSleepCount, 0, \ 1943 "number of times a GC thread (minus the coordinator) " \ 1944 "will sleep while yielding before giving up and resuming GC") \ 1945 \ 1946 notproduct(bool, PrintFlagsFinal, false, \ 1947 "Print all command line flags after argument processing") \ 1948 \ 1949 /* gc tracing */ \ 1950 manageable(bool, PrintGC, false, \ 1951 "Print message at garbage collect") \ 1952 \ 1953 manageable(bool, PrintGCDetails, false, \ 1954 "Print more details at garbage collect") \ 1955 \ 1956 manageable(bool, PrintGCDateStamps, false, \ 1957 "Print date stamps at garbage collect") \ 1958 \ 1959 manageable(bool, PrintGCTimeStamps, false, \ 1960 "Print timestamps at garbage collect") \ 1961 \ 1962 product(bool, PrintGCTaskTimeStamps, false, \ 1963 "Print timestamps for individual gc worker thread tasks") \ 1964 \ 1965 develop(intx, ConcGCYieldTimeout, 0, \ 1966 "If non-zero, assert that GC threads yield within this # of ms.") \ 1967 \ 1968 notproduct(bool, TraceMarkSweep, false, \ 1969 "Trace mark sweep") \ 1970 \ 1971 product(bool, PrintReferenceGC, false, \ 1972 "Print times spent handling reference objects during GC " \ 1973 " (enabled only when PrintGCDetails)") \ 1974 \ 1975 develop(bool, TraceReferenceGC, false, \ 1976 "Trace handling of soft/weak/final/phantom references") \ 1977 \ 1978 develop(bool, TraceFinalizerRegistration, false, \ 1979 "Trace registration of final references") \ 1980 \ 1981 notproduct(bool, TraceScavenge, false, \ 1982 "Trace scavenge") \ 1983 \ 1984 product_rw(bool, TraceClassLoading, false, \ 1985 "Trace all classes loaded") \ 1986 \ 1987 product(bool, TraceClassLoadingPreorder, false, \ 1988 "Trace all classes loaded in order referenced (not loaded)") \ 1989 \ 1990 product_rw(bool, TraceClassUnloading, false, \ 1991 "Trace unloading of classes") \ 1992 \ 1993 product_rw(bool, TraceLoaderConstraints, false, \ 1994 "Trace loader constraints") \ 1995 \ 1996 product(bool, TraceGen0Time, false, \ 1997 "Trace accumulated time for Gen 0 collection") \ 1998 \ 1999 product(bool, TraceGen1Time, false, \ 2000 "Trace accumulated time for Gen 1 collection") \ 2001 \ 2002 product(bool, PrintTenuringDistribution, false, \ 2003 "Print tenuring age information") \ 2004 \ 2005 product_rw(bool, PrintHeapAtGC, false, \ 2006 "Print heap layout before and after each GC") \ 2007 \ 2008 product_rw(bool, PrintHeapAtGCExtended, false, \ 2009 "Prints extended information about the layout of the heap " \ 2010 "when -XX:+PrintHeapAtGC is set") \ 2011 \ 2012 product(bool, PrintHeapAtSIGBREAK, true, \ 2013 "Print heap layout in response to SIGBREAK") \ 2014 \ 2015 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2016 "Print a class histogram before any major stop-world GC") \ 2017 \ 2018 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2019 "Print a class histogram after any major stop-world GC") \ 2020 \ 2021 manageable(bool, PrintClassHistogram, false, \ 2022 "Print a histogram of class instances") \ 2023 \ 2024 develop(bool, TraceWorkGang, false, \ 2025 "Trace activities of work gangs") \ 2026 \ 2027 product(bool, TraceParallelOldGCTasks, false, \ 2028 "Trace multithreaded GC activity") \ 2029 \ 2030 develop(bool, TraceBlockOffsetTable, false, \ 2031 "Print BlockOffsetTable maps") \ 2032 \ 2033 develop(bool, TraceCardTableModRefBS, false, \ 2034 "Print CardTableModRefBS maps") \ 2035 \ 2036 develop(bool, TraceGCTaskManager, false, \ 2037 "Trace actions of the GC task manager") \ 2038 \ 2039 develop(bool, TraceGCTaskQueue, false, \ 2040 "Trace actions of the GC task queues") \ 2041 \ 2042 develop(bool, TraceGCTaskThread, false, \ 2043 "Trace actions of the GC task threads") \ 2044 \ 2045 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2046 "Print the time taken by each parallel old gc phase." \ 2047 "PrintGCDetails must also be enabled.") \ 2048 \ 2049 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2050 "Trace parallel old gc marking phase") \ 2051 \ 2052 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2053 "Trace parallel old gc summary phase") \ 2054 \ 2055 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2056 "Trace parallel old gc compaction phase") \ 2057 \ 2058 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2059 "Trace parallel old gc dense prefix computation") \ 2060 \ 2061 develop(bool, IgnoreLibthreadGPFault, false, \ 2062 "Suppress workaround for libthread GP fault") \ 2063 \ 2064 product(bool, PrintJNIGCStalls, false, \ 2065 "Print diagnostic message when GC is stalled" \ 2066 "by JNI critical section") \ 2067 \ 2068 /* JVMTI heap profiling */ \ 2069 \ 2070 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2071 "Trace JVMTI object tagging calls") \ 2072 \ 2073 diagnostic(bool, VerifyBeforeIteration, false, \ 2074 "Verify memory system before JVMTI iteration") \ 2075 \ 2076 /* compiler interface */ \ 2077 \ 2078 develop(bool, CIPrintCompilerName, false, \ 2079 "when CIPrint is active, print the name of the active compiler") \ 2080 \ 2081 develop(bool, CIPrintCompileQueue, false, \ 2082 "display the contents of the compile queue whenever a " \ 2083 "compilation is enqueued") \ 2084 \ 2085 develop(bool, CIPrintRequests, false, \ 2086 "display every request for compilation") \ 2087 \ 2088 product(bool, CITime, false, \ 2089 "collect timing information for compilation") \ 2090 \ 2091 develop(bool, CITimeEach, false, \ 2092 "display timing information after each successful compilation") \ 2093 \ 2094 develop(bool, CICountOSR, true, \ 2095 "use a separate counter when assigning ids to osr compilations") \ 2096 \ 2097 develop(bool, CICompileNatives, true, \ 2098 "compile native methods if supported by the compiler") \ 2099 \ 2100 develop_pd(bool, CICompileOSR, \ 2101 "compile on stack replacement methods if supported by the " \ 2102 "compiler") \ 2103 \ 2104 develop(bool, CIPrintMethodCodes, false, \ 2105 "print method bytecodes of the compiled code") \ 2106 \ 2107 develop(bool, CIPrintTypeFlow, false, \ 2108 "print the results of ciTypeFlow analysis") \ 2109 \ 2110 develop(bool, CITraceTypeFlow, false, \ 2111 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2112 \ 2113 develop(intx, CICloneLoopTestLimit, 100, \ 2114 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2115 \ 2116 /* temp diagnostics */ \ 2117 \ 2118 diagnostic(bool, TraceRedundantCompiles, false, \ 2119 "Have compile broker print when a request already in the queue is"\ 2120 " requested again") \ 2121 \ 2122 diagnostic(bool, InitialCompileFast, false, \ 2123 "Initial compile at CompLevel_fast_compile") \ 2124 \ 2125 diagnostic(bool, InitialCompileReallyFast, false, \ 2126 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2127 \ 2128 diagnostic(bool, FullProfileOnReInterpret, true, \ 2129 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2130 \ 2131 /* compiler */ \ 2132 \ 2133 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2134 "Number of compiler threads to run") \ 2135 \ 2136 product(intx, CompilationPolicyChoice, 0, \ 2137 "which compilation policy (0/1)") \ 2138 \ 2139 develop(bool, UseStackBanging, true, \ 2140 "use stack banging for stack overflow checks (required for " \ 2141 "proper StackOverflow handling; disable only to measure cost " \ 2142 "of stackbanging)") \ 2143 \ 2144 develop(bool, Use24BitFPMode, true, \ 2145 "Set 24-bit FPU mode on a per-compile basis ") \ 2146 \ 2147 develop(bool, Use24BitFP, true, \ 2148 "use FP instructions that produce 24-bit precise results") \ 2149 \ 2150 develop(bool, UseStrictFP, true, \ 2151 "use strict fp if modifier strictfp is set") \ 2152 \ 2153 develop(bool, GenerateSynchronizationCode, true, \ 2154 "generate locking/unlocking code for synchronized methods and " \ 2155 "monitors") \ 2156 \ 2157 develop(bool, GenerateCompilerNullChecks, true, \ 2158 "Generate explicit null checks for loads/stores/calls") \ 2159 \ 2160 develop(bool, GenerateRangeChecks, true, \ 2161 "Generate range checks for array accesses") \ 2162 \ 2163 develop_pd(bool, ImplicitNullChecks, \ 2164 "generate code for implicit null checks") \ 2165 \ 2166 product(bool, PrintSafepointStatistics, false, \ 2167 "print statistics about safepoint synchronization") \ 2168 \ 2169 product(intx, PrintSafepointStatisticsCount, 300, \ 2170 "total number of safepoint statistics collected " \ 2171 "before printing them out") \ 2172 \ 2173 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2174 "print safepoint statistics only when safepoint takes" \ 2175 " more than PrintSafepointSatisticsTimeout in millis") \ 2176 \ 2177 develop(bool, InlineAccessors, true, \ 2178 "inline accessor methods (get/set)") \ 2179 \ 2180 product(bool, Inline, true, \ 2181 "enable inlining") \ 2182 \ 2183 product(bool, ClipInlining, true, \ 2184 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2185 \ 2186 develop(bool, UseCHA, true, \ 2187 "enable CHA") \ 2188 \ 2189 product(bool, UseTypeProfile, true, \ 2190 "Check interpreter profile for historically monomorphic calls") \ 2191 \ 2192 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2193 "% of major receiver type to all profiled receivers") \ 2194 \ 2195 notproduct(bool, TimeCompiler, false, \ 2196 "time the compiler") \ 2197 \ 2198 notproduct(bool, TimeCompiler2, false, \ 2199 "detailed time the compiler (requires +TimeCompiler)") \ 2200 \ 2201 diagnostic(bool, PrintInlining, false, \ 2202 "prints inlining optimizations") \ 2203 \ 2204 diagnostic(bool, PrintIntrinsics, false, \ 2205 "prints attempted and successful inlining of intrinsics") \ 2206 \ 2207 product(bool, UseCountLeadingZerosInstruction, false, \ 2208 "Use count leading zeros instruction") \ 2209 \ 2210 product(bool, UsePopCountInstruction, false, \ 2211 "Use population count instruction") \ 2212 \ 2213 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2214 "do not expand intrinsics whose (internal) names appear here") \ 2215 \ 2216 develop(bool, StressReflectiveCode, false, \ 2217 "Use inexact types at allocations, etc., to test reflection") \ 2218 \ 2219 develop(bool, EagerInitialization, false, \ 2220 "Eagerly initialize classes if possible") \ 2221 \ 2222 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2223 "Update methodDataOops in Tier1-generated code") \ 2224 \ 2225 develop(bool, TraceMethodReplacement, false, \ 2226 "Print when methods are replaced do to recompilation") \ 2227 \ 2228 develop(bool, PrintMethodFlushing, false, \ 2229 "print the nmethods being flushed") \ 2230 \ 2231 notproduct(bool, LogMultipleMutexLocking, false, \ 2232 "log locking and unlocking of mutexes (only if multiple locks " \ 2233 "are held)") \ 2234 \ 2235 develop(bool, UseRelocIndex, false, \ 2236 "use an index to speed random access to relocations") \ 2237 \ 2238 develop(bool, StressCodeBuffers, false, \ 2239 "Exercise code buffer expansion and other rare state changes") \ 2240 \ 2241 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2242 "Generate extra debugging info for non-safepoints in nmethods") \ 2243 \ 2244 diagnostic(bool, DebugInlinedCalls, true, \ 2245 "If false, restricts profiled locations to the root method only") \ 2246 \ 2247 product(bool, PrintVMOptions, trueInDebug, \ 2248 "print VM flag settings") \ 2249 \ 2250 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2251 "Ignore unrecognized VM options") \ 2252 \ 2253 diagnostic(bool, SerializeVMOutput, true, \ 2254 "Use a mutex to serialize output to tty and hotspot.log") \ 2255 \ 2256 diagnostic(bool, DisplayVMOutput, true, \ 2257 "Display all VM output on the tty, independently of LogVMOutput") \ 2258 \ 2259 diagnostic(bool, LogVMOutput, trueInDebug, \ 2260 "Save VM output to hotspot.log, or to LogFile") \ 2261 \ 2262 diagnostic(ccstr, LogFile, NULL, \ 2263 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2264 \ 2265 product(ccstr, ErrorFile, NULL, \ 2266 "If an error occurs, save the error data to this file " \ 2267 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2268 \ 2269 product(bool, DisplayVMOutputToStderr, false, \ 2270 "If DisplayVMOutput is true, display all VM output to stderr") \ 2271 \ 2272 product(bool, DisplayVMOutputToStdout, false, \ 2273 "If DisplayVMOutput is true, display all VM output to stdout") \ 2274 \ 2275 product(bool, UseHeavyMonitors, false, \ 2276 "use heavyweight instead of lightweight Java monitors") \ 2277 \ 2278 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2279 "print histogram of the symbol table") \ 2280 \ 2281 notproduct(bool, ExitVMOnVerifyError, false, \ 2282 "standard exit from VM if bytecode verify error " \ 2283 "(only in debug mode)") \ 2284 \ 2285 notproduct(ccstr, AbortVMOnException, NULL, \ 2286 "Call fatal if this exception is thrown. Example: " \ 2287 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2288 \ 2289 develop(bool, DebugVtables, false, \ 2290 "add debugging code to vtable dispatch") \ 2291 \ 2292 develop(bool, PrintVtables, false, \ 2293 "print vtables when printing klass") \ 2294 \ 2295 notproduct(bool, PrintVtableStats, false, \ 2296 "print vtables stats at end of run") \ 2297 \ 2298 develop(bool, TraceCreateZombies, false, \ 2299 "trace creation of zombie nmethods") \ 2300 \ 2301 notproduct(bool, IgnoreLockingAssertions, false, \ 2302 "disable locking assertions (for speed)") \ 2303 \ 2304 notproduct(bool, VerifyLoopOptimizations, false, \ 2305 "verify major loop optimizations") \ 2306 \ 2307 product(bool, RangeCheckElimination, true, \ 2308 "Split loop iterations to eliminate range checks") \ 2309 \ 2310 develop_pd(bool, UncommonNullCast, \ 2311 "track occurrences of null in casts; adjust compiler tactics") \ 2312 \ 2313 develop(bool, TypeProfileCasts, true, \ 2314 "treat casts like calls for purposes of type profiling") \ 2315 \ 2316 develop(bool, MonomorphicArrayCheck, true, \ 2317 "Uncommon-trap array store checks that require full type check") \ 2318 \ 2319 develop(bool, DelayCompilationDuringStartup, true, \ 2320 "Delay invoking the compiler until main application class is " \ 2321 "loaded") \ 2322 \ 2323 develop(bool, CompileTheWorld, false, \ 2324 "Compile all methods in all classes in bootstrap class path " \ 2325 "(stress test)") \ 2326 \ 2327 develop(bool, CompileTheWorldPreloadClasses, true, \ 2328 "Preload all classes used by a class before start loading") \ 2329 \ 2330 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2331 "Compile all methods although class initializer failed") \ 2332 \ 2333 develop(bool, TraceIterativeGVN, false, \ 2334 "Print progress during Iterative Global Value Numbering") \ 2335 \ 2336 develop(bool, FillDelaySlots, true, \ 2337 "Fill delay slots (on SPARC only)") \ 2338 \ 2339 develop(bool, VerifyIterativeGVN, false, \ 2340 "Verify Def-Use modifications during sparse Iterative Global " \ 2341 "Value Numbering") \ 2342 \ 2343 notproduct(bool, TracePhaseCCP, false, \ 2344 "Print progress during Conditional Constant Propagation") \ 2345 \ 2346 develop(bool, TimeLivenessAnalysis, false, \ 2347 "Time computation of bytecode liveness analysis") \ 2348 \ 2349 develop(bool, TraceLivenessGen, false, \ 2350 "Trace the generation of liveness analysis information") \ 2351 \ 2352 notproduct(bool, TraceLivenessQuery, false, \ 2353 "Trace queries of liveness analysis information") \ 2354 \ 2355 notproduct(bool, CollectIndexSetStatistics, false, \ 2356 "Collect information about IndexSets") \ 2357 \ 2358 develop(bool, PrintDominators, false, \ 2359 "Print out dominator trees for GVN") \ 2360 \ 2361 develop(bool, UseLoopSafepoints, true, \ 2362 "Generate Safepoint nodes in every loop") \ 2363 \ 2364 notproduct(bool, TraceCISCSpill, false, \ 2365 "Trace allocators use of cisc spillable instructions") \ 2366 \ 2367 notproduct(bool, TraceSpilling, false, \ 2368 "Trace spilling") \ 2369 \ 2370 develop(bool, DeutschShiffmanExceptions, true, \ 2371 "Fast check to find exception handler for precisely typed " \ 2372 "exceptions") \ 2373 \ 2374 product(bool, SplitIfBlocks, true, \ 2375 "Clone compares and control flow through merge points to fold " \ 2376 "some branches") \ 2377 \ 2378 develop(intx, FastAllocateSizeLimit, 128*K, \ 2379 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2380 "Inline allocations larger than this in doublewords must go slow")\ 2381 \ 2382 product(bool, AggressiveOpts, false, \ 2383 "Enable aggressive optimizations - see arguments.cpp") \ 2384 \ 2385 product(bool, UseStringCache, false, \ 2386 "Enable String cache capabilities on String.java") \ 2387 \ 2388 /* statistics */ \ 2389 develop(bool, UseVTune, false, \ 2390 "enable support for Intel's VTune profiler") \ 2391 \ 2392 develop(bool, CountCompiledCalls, false, \ 2393 "counts method invocations") \ 2394 \ 2395 notproduct(bool, CountRuntimeCalls, false, \ 2396 "counts VM runtime calls") \ 2397 \ 2398 develop(bool, CountJNICalls, false, \ 2399 "counts jni method invocations") \ 2400 \ 2401 notproduct(bool, CountJVMCalls, false, \ 2402 "counts jvm method invocations") \ 2403 \ 2404 notproduct(bool, CountRemovableExceptions, false, \ 2405 "count exceptions that could be replaced by branches due to " \ 2406 "inlining") \ 2407 \ 2408 notproduct(bool, ICMissHistogram, false, \ 2409 "produce histogram of IC misses") \ 2410 \ 2411 notproduct(bool, PrintClassStatistics, false, \ 2412 "prints class statistics at end of run") \ 2413 \ 2414 notproduct(bool, PrintMethodStatistics, false, \ 2415 "prints method statistics at end of run") \ 2416 \ 2417 /* interpreter */ \ 2418 develop(bool, ClearInterpreterLocals, false, \ 2419 "Always clear local variables of interpreter activations upon " \ 2420 "entry") \ 2421 \ 2422 product_pd(bool, RewriteBytecodes, \ 2423 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2424 \ 2425 product_pd(bool, RewriteFrequentPairs, \ 2426 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2427 \ 2428 diagnostic(bool, PrintInterpreter, false, \ 2429 "Prints the generated interpreter code") \ 2430 \ 2431 product(bool, UseInterpreter, true, \ 2432 "Use interpreter for non-compiled methods") \ 2433 \ 2434 develop(bool, UseFastSignatureHandlers, true, \ 2435 "Use fast signature handlers for native calls") \ 2436 \ 2437 develop(bool, UseV8InstrsOnly, false, \ 2438 "Use SPARC-V8 Compliant instruction subset") \ 2439 \ 2440 product(bool, UseNiagaraInstrs, false, \ 2441 "Use Niagara-efficient instruction subset") \ 2442 \ 2443 develop(bool, UseCASForSwap, false, \ 2444 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2445 \ 2446 product(bool, UseLoopCounter, true, \ 2447 "Increment invocation counter on backward branch") \ 2448 \ 2449 product(bool, UseFastEmptyMethods, true, \ 2450 "Use fast method entry code for empty methods") \ 2451 \ 2452 product(bool, UseFastAccessorMethods, true, \ 2453 "Use fast method entry code for accessor methods") \ 2454 \ 2455 product_pd(bool, UseOnStackReplacement, \ 2456 "Use on stack replacement, calls runtime if invoc. counter " \ 2457 "overflows in loop") \ 2458 \ 2459 notproduct(bool, TraceOnStackReplacement, false, \ 2460 "Trace on stack replacement") \ 2461 \ 2462 develop(bool, PoisonOSREntry, true, \ 2463 "Detect abnormal calls to OSR code") \ 2464 \ 2465 product_pd(bool, PreferInterpreterNativeStubs, \ 2466 "Use always interpreter stubs for native methods invoked via " \ 2467 "interpreter") \ 2468 \ 2469 develop(bool, CountBytecodes, false, \ 2470 "Count number of bytecodes executed") \ 2471 \ 2472 develop(bool, PrintBytecodeHistogram, false, \ 2473 "Print histogram of the executed bytecodes") \ 2474 \ 2475 develop(bool, PrintBytecodePairHistogram, false, \ 2476 "Print histogram of the executed bytecode pairs") \ 2477 \ 2478 diagnostic(bool, PrintSignatureHandlers, false, \ 2479 "Print code generated for native method signature handlers") \ 2480 \ 2481 develop(bool, VerifyOops, false, \ 2482 "Do plausibility checks for oops") \ 2483 \ 2484 develop(bool, CheckUnhandledOops, false, \ 2485 "Check for unhandled oops in VM code") \ 2486 \ 2487 develop(bool, VerifyJNIFields, trueInDebug, \ 2488 "Verify jfieldIDs for instance fields") \ 2489 \ 2490 notproduct(bool, VerifyJNIEnvThread, false, \ 2491 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2492 "from JNI") \ 2493 \ 2494 develop(bool, VerifyFPU, false, \ 2495 "Verify FPU state (check for NaN's, etc.)") \ 2496 \ 2497 develop(bool, VerifyThread, false, \ 2498 "Watch the thread register for corruption (SPARC only)") \ 2499 \ 2500 develop(bool, VerifyActivationFrameSize, false, \ 2501 "Verify that activation frame didn't become smaller than its " \ 2502 "minimal size") \ 2503 \ 2504 develop(bool, TraceFrequencyInlining, false, \ 2505 "Trace frequency based inlining") \ 2506 \ 2507 notproduct(bool, TraceTypeProfile, false, \ 2508 "Trace type profile") \ 2509 \ 2510 develop_pd(bool, InlineIntrinsics, \ 2511 "Inline intrinsics that can be statically resolved") \ 2512 \ 2513 product_pd(bool, ProfileInterpreter, \ 2514 "Profile at the bytecode level during interpretation") \ 2515 \ 2516 develop_pd(bool, ProfileTraps, \ 2517 "Profile deoptimization traps at the bytecode level") \ 2518 \ 2519 product(intx, ProfileMaturityPercentage, 20, \ 2520 "number of method invocations/branches (expressed as % of " \ 2521 "CompileThreshold) before using the method's profile") \ 2522 \ 2523 develop(bool, PrintMethodData, false, \ 2524 "Print the results of +ProfileInterpreter at end of run") \ 2525 \ 2526 develop(bool, VerifyDataPointer, trueInDebug, \ 2527 "Verify the method data pointer during interpreter profiling") \ 2528 \ 2529 develop(bool, VerifyCompiledCode, false, \ 2530 "Include miscellaneous runtime verifications in nmethod code; " \ 2531 "off by default because it disturbs nmethod size heuristics.") \ 2532 \ 2533 \ 2534 /* compilation */ \ 2535 product(bool, UseCompiler, true, \ 2536 "use compilation") \ 2537 \ 2538 develop(bool, TraceCompilationPolicy, false, \ 2539 "Trace compilation policy") \ 2540 \ 2541 develop(bool, TimeCompilationPolicy, false, \ 2542 "Time the compilation policy") \ 2543 \ 2544 product(bool, UseCounterDecay, true, \ 2545 "adjust recompilation counters") \ 2546 \ 2547 develop(intx, CounterHalfLifeTime, 30, \ 2548 "half-life time of invocation counters (in secs)") \ 2549 \ 2550 develop(intx, CounterDecayMinIntervalLength, 500, \ 2551 "Min. ms. between invocation of CounterDecay") \ 2552 \ 2553 product(bool, AlwaysCompileLoopMethods, false, \ 2554 "when using recompilation, never interpret methods " \ 2555 "containing loops") \ 2556 \ 2557 product(bool, DontCompileHugeMethods, true, \ 2558 "don't compile methods > HugeMethodLimit") \ 2559 \ 2560 /* Bytecode escape analysis estimation. */ \ 2561 product(bool, EstimateArgEscape, true, \ 2562 "Analyze bytecodes to estimate escape state of arguments") \ 2563 \ 2564 product(intx, BCEATraceLevel, 0, \ 2565 "How much tracing to do of bytecode escape analysis estimates") \ 2566 \ 2567 product(intx, MaxBCEAEstimateLevel, 5, \ 2568 "Maximum number of nested calls that are analyzed by BC EA.") \ 2569 \ 2570 product(intx, MaxBCEAEstimateSize, 150, \ 2571 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2572 \ 2573 product(intx, AllocatePrefetchStyle, 1, \ 2574 "0 = no prefetch, " \ 2575 "1 = prefetch instructions for each allocation, " \ 2576 "2 = use TLAB watermark to gate allocation prefetch") \ 2577 \ 2578 product(intx, AllocatePrefetchDistance, -1, \ 2579 "Distance to prefetch ahead of allocation pointer") \ 2580 \ 2581 product(intx, AllocatePrefetchLines, 1, \ 2582 "Number of lines to prefetch ahead of allocation pointer") \ 2583 \ 2584 product(intx, AllocatePrefetchStepSize, 16, \ 2585 "Step size in bytes of sequential prefetch instructions") \ 2586 \ 2587 product(intx, AllocatePrefetchInstr, 0, \ 2588 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2589 \ 2590 product(intx, ReadPrefetchInstr, 0, \ 2591 "Prefetch instruction to prefetch ahead") \ 2592 \ 2593 /* deoptimization */ \ 2594 develop(bool, TraceDeoptimization, false, \ 2595 "Trace deoptimization") \ 2596 \ 2597 develop(bool, DebugDeoptimization, false, \ 2598 "Tracing various information while debugging deoptimization") \ 2599 \ 2600 product(intx, SelfDestructTimer, 0, \ 2601 "Will cause VM to terminate after a given time (in minutes) " \ 2602 "(0 means off)") \ 2603 \ 2604 product(intx, MaxJavaStackTraceDepth, 1024, \ 2605 "Max. no. of lines in the stack trace for Java exceptions " \ 2606 "(0 means all)") \ 2607 \ 2608 develop(intx, GuaranteedSafepointInterval, 1000, \ 2609 "Guarantee a safepoint (at least) every so many milliseconds " \ 2610 "(0 means none)") \ 2611 \ 2612 product(intx, SafepointTimeoutDelay, 10000, \ 2613 "Delay in milliseconds for option SafepointTimeout") \ 2614 \ 2615 product(intx, NmethodSweepFraction, 4, \ 2616 "Number of invocations of sweeper to cover all nmethods") \ 2617 \ 2618 notproduct(intx, MemProfilingInterval, 500, \ 2619 "Time between each invocation of the MemProfiler") \ 2620 \ 2621 develop(intx, MallocCatchPtr, -1, \ 2622 "Hit breakpoint when mallocing/freeing this pointer") \ 2623 \ 2624 notproduct(intx, AssertRepeat, 1, \ 2625 "number of times to evaluate expression in assert " \ 2626 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2627 \ 2628 notproduct(ccstrlist, SuppressErrorAt, "", \ 2629 "List of assertions (file:line) to muzzle") \ 2630 \ 2631 notproduct(uintx, HandleAllocationLimit, 1024, \ 2632 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2633 "is used") \ 2634 \ 2635 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2636 "Threshold for total handle allocation when " \ 2637 "+TraceHandleAllocation is used") \ 2638 \ 2639 develop(intx, StackPrintLimit, 100, \ 2640 "number of stack frames to print in VM-level stack dump") \ 2641 \ 2642 notproduct(intx, MaxElementPrintSize, 256, \ 2643 "maximum number of elements to print") \ 2644 \ 2645 notproduct(intx, MaxSubklassPrintSize, 4, \ 2646 "maximum number of subklasses to print when printing klass") \ 2647 \ 2648 develop(intx, MaxInlineLevel, 9, \ 2649 "maximum number of nested calls that are inlined") \ 2650 \ 2651 develop(intx, MaxRecursiveInlineLevel, 1, \ 2652 "maximum number of nested recursive calls that are inlined") \ 2653 \ 2654 product_pd(intx, InlineSmallCode, \ 2655 "Only inline already compiled methods if their code size is " \ 2656 "less than this") \ 2657 \ 2658 product(intx, MaxInlineSize, 35, \ 2659 "maximum bytecode size of a method to be inlined") \ 2660 \ 2661 product_pd(intx, FreqInlineSize, \ 2662 "maximum bytecode size of a frequent method to be inlined") \ 2663 \ 2664 develop(intx, MaxTrivialSize, 6, \ 2665 "maximum bytecode size of a trivial method to be inlined") \ 2666 \ 2667 develop(intx, MinInliningThreshold, 250, \ 2668 "min. invocation count a method needs to have to be inlined") \ 2669 \ 2670 develop(intx, AlignEntryCode, 4, \ 2671 "aligns entry code to specified value (in bytes)") \ 2672 \ 2673 develop(intx, MethodHistogramCutoff, 100, \ 2674 "cutoff value for method invoc. histogram (+CountCalls)") \ 2675 \ 2676 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2677 "# of interpreted methods to show in profile") \ 2678 \ 2679 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2680 "# of compiled methods to show in profile") \ 2681 \ 2682 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2683 "# of stub methods to show in profile") \ 2684 \ 2685 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2686 "# of runtime stub nodes to show in profile") \ 2687 \ 2688 product(intx, ProfileIntervalsTicks, 100, \ 2689 "# of ticks between printing of interval profile " \ 2690 "(+ProfileIntervals)") \ 2691 \ 2692 notproduct(intx, ScavengeALotInterval, 1, \ 2693 "Interval between which scavenge will occur with +ScavengeALot") \ 2694 \ 2695 notproduct(intx, FullGCALotInterval, 1, \ 2696 "Interval between which full gc will occur with +FullGCALot") \ 2697 \ 2698 notproduct(intx, FullGCALotStart, 0, \ 2699 "For which invocation to start FullGCAlot") \ 2700 \ 2701 notproduct(intx, FullGCALotDummies, 32*K, \ 2702 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2703 "to move") \ 2704 \ 2705 develop(intx, DontYieldALotInterval, 10, \ 2706 "Interval between which yields will be dropped (milliseconds)") \ 2707 \ 2708 develop(intx, MinSleepInterval, 1, \ 2709 "Minimum sleep() interval (milliseconds) when " \ 2710 "ConvertSleepToYield is off (used for SOLARIS)") \ 2711 \ 2712 product(intx, EventLogLength, 2000, \ 2713 "maximum nof events in event log") \ 2714 \ 2715 develop(intx, ProfilerPCTickThreshold, 15, \ 2716 "Number of ticks in a PC buckets to be a hotspot") \ 2717 \ 2718 notproduct(intx, DeoptimizeALotInterval, 5, \ 2719 "Number of exits until DeoptimizeALot kicks in") \ 2720 \ 2721 notproduct(intx, ZombieALotInterval, 5, \ 2722 "Number of exits until ZombieALot kicks in") \ 2723 \ 2724 develop(bool, StressNonEntrant, false, \ 2725 "Mark nmethods non-entrant at registration") \ 2726 \ 2727 diagnostic(intx, MallocVerifyInterval, 0, \ 2728 "if non-zero, verify C heap after every N calls to " \ 2729 "malloc/realloc/free") \ 2730 \ 2731 diagnostic(intx, MallocVerifyStart, 0, \ 2732 "if non-zero, start verifying C heap after Nth call to " \ 2733 "malloc/realloc/free") \ 2734 \ 2735 product(intx, TypeProfileWidth, 2, \ 2736 "number of receiver types to record in call/cast profile") \ 2737 \ 2738 develop(intx, BciProfileWidth, 2, \ 2739 "number of return bci's to record in ret profile") \ 2740 \ 2741 product(intx, PerMethodRecompilationCutoff, 400, \ 2742 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2743 \ 2744 product(intx, PerBytecodeRecompilationCutoff, 100, \ 2745 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2746 \ 2747 product(intx, PerMethodTrapLimit, 100, \ 2748 "Limit on traps (of one kind) in a method (includes inlines)") \ 2749 \ 2750 product(intx, PerBytecodeTrapLimit, 4, \ 2751 "Limit on traps (of one kind) at a particular BCI") \ 2752 \ 2753 develop(intx, FreqCountInvocations, 1, \ 2754 "Scaling factor for branch frequencies (deprecated)") \ 2755 \ 2756 develop(intx, InlineFrequencyRatio, 20, \ 2757 "Ratio of call site execution to caller method invocation") \ 2758 \ 2759 develop_pd(intx, InlineFrequencyCount, \ 2760 "Count of call site execution necessary to trigger frequent " \ 2761 "inlining") \ 2762 \ 2763 develop(intx, InlineThrowCount, 50, \ 2764 "Force inlining of interpreted methods that throw this often") \ 2765 \ 2766 develop(intx, InlineThrowMaxSize, 200, \ 2767 "Force inlining of throwing methods smaller than this") \ 2768 \ 2769 product(intx, AliasLevel, 3, \ 2770 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2771 "2 for class split, 3 for unique instances") \ 2772 \ 2773 develop(bool, VerifyAliases, false, \ 2774 "perform extra checks on the results of alias analysis") \ 2775 \ 2776 develop(intx, ProfilerNodeSize, 1024, \ 2777 "Size in K to allocate for the Profile Nodes of each thread") \ 2778 \ 2779 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2780 "Number of times to spin wait on a v8 atomic operation lock") \ 2781 \ 2782 product(intx, ReadSpinIterations, 100, \ 2783 "Number of read attempts before a yield (spin inner loop)") \ 2784 \ 2785 product_pd(intx, PreInflateSpin, \ 2786 "Number of times to spin wait before inflation") \ 2787 \ 2788 product(intx, PreBlockSpin, 10, \ 2789 "Number of times to spin in an inflated lock before going to " \ 2790 "an OS lock") \ 2791 \ 2792 /* gc parameters */ \ 2793 product(uintx, MaxHeapSize, ScaleForWordSize(64*M), \ 2794 "Default maximum size for object heap (in bytes)") \ 2795 \ 2796 product_pd(uintx, NewSize, \ 2797 "Default size of new generation (in bytes)") \ 2798 \ 2799 product(uintx, MaxNewSize, max_uintx, \ 2800 "Maximum size of new generation (in bytes)") \ 2801 \ 2802 product(uintx, PretenureSizeThreshold, 0, \ 2803 "Max size in bytes of objects allocated in DefNew generation") \ 2804 \ 2805 product_pd(uintx, TLABSize, \ 2806 "Default (or starting) size of TLAB (in bytes)") \ 2807 \ 2808 product(uintx, MinTLABSize, 2*K, \ 2809 "Minimum allowed TLAB size (in bytes)") \ 2810 \ 2811 product(uintx, TLABAllocationWeight, 35, \ 2812 "Allocation averaging weight") \ 2813 \ 2814 product(uintx, TLABWasteTargetPercent, 1, \ 2815 "Percentage of Eden that can be wasted") \ 2816 \ 2817 product(uintx, TLABRefillWasteFraction, 64, \ 2818 "Max TLAB waste at a refill (internal fragmentation)") \ 2819 \ 2820 product(uintx, TLABWasteIncrement, 4, \ 2821 "Increment allowed waste at slow allocation") \ 2822 \ 2823 product_pd(intx, SurvivorRatio, \ 2824 "Ratio of eden/survivor space size") \ 2825 \ 2826 product_pd(intx, NewRatio, \ 2827 "Ratio of new/old generation sizes") \ 2828 \ 2829 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2830 "Max percent of eden objects that will be live at scavenge") \ 2831 \ 2832 product_pd(uintx, NewSizeThreadIncrease, \ 2833 "Additional size added to desired new generation size per " \ 2834 "non-daemon thread (in bytes)") \ 2835 \ 2836 product(uintx, OldSize, ScaleForWordSize(4096*K), \ 2837 "Default size of tenured generation (in bytes)") \ 2838 \ 2839 product_pd(uintx, PermSize, \ 2840 "Default size of permanent generation (in bytes)") \ 2841 \ 2842 product_pd(uintx, MaxPermSize, \ 2843 "Maximum size of permanent generation (in bytes)") \ 2844 \ 2845 product(uintx, MinHeapFreeRatio, 40, \ 2846 "Min percentage of heap free after GC to avoid expansion") \ 2847 \ 2848 product(uintx, MaxHeapFreeRatio, 70, \ 2849 "Max percentage of heap free after GC to avoid shrinking") \ 2850 \ 2851 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2852 "Number of milliseconds per MB of free space in the heap") \ 2853 \ 2854 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2855 "Min change in heap space due to GC (in bytes)") \ 2856 \ 2857 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 2858 "Min expansion of permanent heap (in bytes)") \ 2859 \ 2860 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 2861 "Max expansion of permanent heap without full GC (in bytes)") \ 2862 \ 2863 product(intx, QueuedAllocationWarningCount, 0, \ 2864 "Number of times an allocation that queues behind a GC " \ 2865 "will retry before printing a warning") \ 2866 \ 2867 diagnostic(uintx, VerifyGCStartAt, 0, \ 2868 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 2869 \ 2870 diagnostic(intx, VerifyGCLevel, 0, \ 2871 "Generation level at which to start +VerifyBefore/AfterGC") \ 2872 \ 2873 develop(uintx, ExitAfterGCNum, 0, \ 2874 "If non-zero, exit after this GC.") \ 2875 \ 2876 product(intx, MaxTenuringThreshold, 15, \ 2877 "Maximum value for tenuring threshold") \ 2878 \ 2879 product(intx, InitialTenuringThreshold, 7, \ 2880 "Initial value for tenuring threshold") \ 2881 \ 2882 product(intx, TargetSurvivorRatio, 50, \ 2883 "Desired percentage of survivor space used after scavenge") \ 2884 \ 2885 product(uintx, MarkSweepDeadRatio, 5, \ 2886 "Percentage (0-100) of the old gen allowed as dead wood." \ 2887 "Serial mark sweep treats this as both the min and max value." \ 2888 "CMS uses this value only if it falls back to mark sweep." \ 2889 "Par compact uses a variable scale based on the density of the" \ 2890 "generation and treats this as the max value when the heap is" \ 2891 "either completely full or completely empty. Par compact also" \ 2892 "has a smaller default value; see arguments.cpp.") \ 2893 \ 2894 product(uintx, PermMarkSweepDeadRatio, 20, \ 2895 "Percentage (0-100) of the perm gen allowed as dead wood." \ 2896 "See MarkSweepDeadRatio for collector-specific comments.") \ 2897 \ 2898 product(intx, MarkSweepAlwaysCompactCount, 4, \ 2899 "How often should we fully compact the heap (ignoring the dead " \ 2900 "space parameters)") \ 2901 \ 2902 product(intx, PrintCMSStatistics, 0, \ 2903 "Statistics for CMS") \ 2904 \ 2905 product(bool, PrintCMSInitiationStatistics, false, \ 2906 "Statistics for initiating a CMS collection") \ 2907 \ 2908 product(intx, PrintFLSStatistics, 0, \ 2909 "Statistics for CMS' FreeListSpace") \ 2910 \ 2911 product(intx, PrintFLSCensus, 0, \ 2912 "Census for CMS' FreeListSpace") \ 2913 \ 2914 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 2915 "Delay in ms between expansion and allocation") \ 2916 \ 2917 product(intx, DeferThrSuspendLoopCount, 4000, \ 2918 "(Unstable) Number of times to iterate in safepoint loop " \ 2919 " before blocking VM threads ") \ 2920 \ 2921 product(intx, DeferPollingPageLoopCount, -1, \ 2922 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 2923 "before changing safepoint polling page to RO ") \ 2924 \ 2925 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 2926 \ 2927 product(bool, UseDepthFirstScavengeOrder, true, \ 2928 "true: the scavenge order will be depth-first, " \ 2929 "false: the scavenge order will be breadth-first") \ 2930 \ 2931 product(bool, PSChunkLargeArrays, true, \ 2932 "true: process large arrays in chunks") \ 2933 \ 2934 product(uintx, GCDrainStackTargetSize, 64, \ 2935 "how many entries we'll try to leave on the stack during " \ 2936 "parallel GC") \ 2937 \ 2938 /* stack parameters */ \ 2939 product_pd(intx, StackYellowPages, \ 2940 "Number of yellow zone (recoverable overflows) pages") \ 2941 \ 2942 product_pd(intx, StackRedPages, \ 2943 "Number of red zone (unrecoverable overflows) pages") \ 2944 \ 2945 product_pd(intx, StackShadowPages, \ 2946 "Number of shadow zone (for overflow checking) pages" \ 2947 " this should exceed the depth of the VM and native call stack") \ 2948 \ 2949 product_pd(intx, ThreadStackSize, \ 2950 "Thread Stack Size (in Kbytes)") \ 2951 \ 2952 product_pd(intx, VMThreadStackSize, \ 2953 "Non-Java Thread Stack Size (in Kbytes)") \ 2954 \ 2955 product_pd(intx, CompilerThreadStackSize, \ 2956 "Compiler Thread Stack Size (in Kbytes)") \ 2957 \ 2958 develop_pd(uintx, JVMInvokeMethodSlack, \ 2959 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 2960 \ 2961 product(uintx, ThreadSafetyMargin, 50*M, \ 2962 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 2963 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 2964 "disable this feature") \ 2965 \ 2966 /* code cache parameters */ \ 2967 develop(uintx, CodeCacheSegmentSize, 64, \ 2968 "Code cache segment size (in bytes) - smallest unit of " \ 2969 "allocation") \ 2970 \ 2971 develop_pd(intx, CodeEntryAlignment, \ 2972 "Code entry alignment for generated code (in bytes)") \ 2973 \ 2974 product_pd(uintx, InitialCodeCacheSize, \ 2975 "Initial code cache size (in bytes)") \ 2976 \ 2977 product_pd(uintx, ReservedCodeCacheSize, \ 2978 "Reserved code cache size (in bytes) - maximum code cache size") \ 2979 \ 2980 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 2981 "When less than X space left, we stop compiling.") \ 2982 \ 2983 product_pd(uintx, CodeCacheExpansionSize, \ 2984 "Code cache expansion size (in bytes)") \ 2985 \ 2986 develop_pd(uintx, CodeCacheMinBlockLength, \ 2987 "Minimum number of segments in a code cache block.") \ 2988 \ 2989 notproduct(bool, ExitOnFullCodeCache, false, \ 2990 "Exit the VM if we fill the code cache.") \ 2991 \ 2992 /* interpreter debugging */ \ 2993 develop(intx, BinarySwitchThreshold, 5, \ 2994 "Minimal number of lookupswitch entries for rewriting to binary " \ 2995 "switch") \ 2996 \ 2997 develop(intx, StopInterpreterAt, 0, \ 2998 "Stops interpreter execution at specified bytecode number") \ 2999 \ 3000 develop(intx, TraceBytecodesAt, 0, \ 3001 "Traces bytecodes starting with specified bytecode number") \ 3002 \ 3003 /* compiler interface */ \ 3004 develop(intx, CIStart, 0, \ 3005 "the id of the first compilation to permit") \ 3006 \ 3007 develop(intx, CIStop, -1, \ 3008 "the id of the last compilation to permit") \ 3009 \ 3010 develop(intx, CIStartOSR, 0, \ 3011 "the id of the first osr compilation to permit " \ 3012 "(CICountOSR must be on)") \ 3013 \ 3014 develop(intx, CIStopOSR, -1, \ 3015 "the id of the last osr compilation to permit " \ 3016 "(CICountOSR must be on)") \ 3017 \ 3018 develop(intx, CIBreakAtOSR, -1, \ 3019 "id of osr compilation to break at") \ 3020 \ 3021 develop(intx, CIBreakAt, -1, \ 3022 "id of compilation to break at") \ 3023 \ 3024 product(ccstrlist, CompileOnly, "", \ 3025 "List of methods (pkg/class.name) to restrict compilation to") \ 3026 \ 3027 product(ccstr, CompileCommandFile, NULL, \ 3028 "Read compiler commands from this file [.hotspot_compiler]") \ 3029 \ 3030 product(ccstrlist, CompileCommand, "", \ 3031 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3032 \ 3033 product(bool, CICompilerCountPerCPU, false, \ 3034 "1 compiler thread for log(N CPUs)") \ 3035 \ 3036 develop(intx, CIFireOOMAt, -1, \ 3037 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3038 "(non-negative value throws OOM after this many CI accesses " \ 3039 "in each compile)") \ 3040 \ 3041 develop(intx, CIFireOOMAtDelay, -1, \ 3042 "Wait for this many CI accesses to occur in all compiles before " \ 3043 "beginning to throw OutOfMemoryErrors in each compile") \ 3044 \ 3045 notproduct(bool, CIObjectFactoryVerify, false, \ 3046 "enable potentially expensive verification in ciObjectFactory") \ 3047 \ 3048 /* Priorities */ \ 3049 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3050 \ 3051 product(intx, ThreadPriorityPolicy, 0, \ 3052 "0 : Normal. "\ 3053 " VM chooses priorities that are appropriate for normal "\ 3054 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3055 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3056 " map to lower native priority values. On Windows applications"\ 3057 " are allowed to use higher native priorities. However, with "\ 3058 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3059 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3060 " interfere with system threads. On Linux thread priorities "\ 3061 " are ignored because the OS does not support static priority "\ 3062 " in SCHED_OTHER scheduling class which is the only choice for"\ 3063 " non-root, non-realtime applications. "\ 3064 "1 : Aggressive. "\ 3065 " Java thread priorities map over to the entire range of "\ 3066 " native thread priorities. Higher Java thread priorities map "\ 3067 " to higher native thread priorities. This policy should be "\ 3068 " used with care, as sometimes it can cause performance "\ 3069 " degradation in the application and/or the entire system. On "\ 3070 " Linux this policy requires root privilege.") \ 3071 \ 3072 product(bool, ThreadPriorityVerbose, false, \ 3073 "print priority changes") \ 3074 \ 3075 product(intx, DefaultThreadPriority, -1, \ 3076 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3077 \ 3078 product(intx, CompilerThreadPriority, -1, \ 3079 "what priority should compiler threads run at (-1 means no change)") \ 3080 \ 3081 product(intx, VMThreadPriority, -1, \ 3082 "what priority should VM threads run at (-1 means no change)") \ 3083 \ 3084 product(bool, CompilerThreadHintNoPreempt, true, \ 3085 "(Solaris only) Give compiler threads an extra quanta") \ 3086 \ 3087 product(bool, VMThreadHintNoPreempt, false, \ 3088 "(Solaris only) Give VM thread an extra quanta") \ 3089 \ 3090 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3091 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3092 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3093 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3094 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3095 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3096 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3097 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3098 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3099 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3100 \ 3101 /* compiler debugging */ \ 3102 notproduct(intx, CompileTheWorldStartAt, 1, \ 3103 "First class to consider when using +CompileTheWorld") \ 3104 \ 3105 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3106 "Last class to consider when using +CompileTheWorld") \ 3107 \ 3108 develop(intx, NewCodeParameter, 0, \ 3109 "Testing Only: Create a dedicated integer parameter before " \ 3110 "putback") \ 3111 \ 3112 /* new oopmap storage allocation */ \ 3113 develop(intx, MinOopMapAllocation, 8, \ 3114 "Minimum number of OopMap entries in an OopMapSet") \ 3115 \ 3116 /* Background Compilation */ \ 3117 develop(intx, LongCompileThreshold, 50, \ 3118 "Used with +TraceLongCompiles") \ 3119 \ 3120 product(intx, StarvationMonitorInterval, 200, \ 3121 "Pause between each check in ms") \ 3122 \ 3123 /* recompilation */ \ 3124 product_pd(intx, CompileThreshold, \ 3125 "number of interpreted method invocations before (re-)compiling") \ 3126 \ 3127 product_pd(intx, BackEdgeThreshold, \ 3128 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3129 \ 3130 product(intx, Tier1BytecodeLimit, 10, \ 3131 "Must have at least this many bytecodes before tier1" \ 3132 "invocation counters are used") \ 3133 \ 3134 product_pd(intx, Tier2CompileThreshold, \ 3135 "threshold at which a tier 2 compilation is invoked") \ 3136 \ 3137 product_pd(intx, Tier2BackEdgeThreshold, \ 3138 "Back edge threshold at which a tier 2 compilation is invoked") \ 3139 \ 3140 product_pd(intx, Tier3CompileThreshold, \ 3141 "threshold at which a tier 3 compilation is invoked") \ 3142 \ 3143 product_pd(intx, Tier3BackEdgeThreshold, \ 3144 "Back edge threshold at which a tier 3 compilation is invoked") \ 3145 \ 3146 product_pd(intx, Tier4CompileThreshold, \ 3147 "threshold at which a tier 4 compilation is invoked") \ 3148 \ 3149 product_pd(intx, Tier4BackEdgeThreshold, \ 3150 "Back edge threshold at which a tier 4 compilation is invoked") \ 3151 \ 3152 product_pd(bool, TieredCompilation, \ 3153 "Enable two-tier compilation") \ 3154 \ 3155 product(bool, StressTieredRuntime, false, \ 3156 "Alternate client and server compiler on compile requests") \ 3157 \ 3158 product_pd(intx, OnStackReplacePercentage, \ 3159 "NON_TIERED number of method invocations/branches (expressed as %"\ 3160 "of CompileThreshold) before (re-)compiling OSR code") \ 3161 \ 3162 product(intx, InterpreterProfilePercentage, 33, \ 3163 "NON_TIERED number of method invocations/branches (expressed as %"\ 3164 "of CompileThreshold) before profiling in the interpreter") \ 3165 \ 3166 develop(intx, MaxRecompilationSearchLength, 10, \ 3167 "max. # frames to inspect searching for recompilee") \ 3168 \ 3169 develop(intx, MaxInterpretedSearchLength, 3, \ 3170 "max. # interp. frames to skip when searching for recompilee") \ 3171 \ 3172 develop(intx, DesiredMethodLimit, 8000, \ 3173 "desired max. method size (in bytecodes) after inlining") \ 3174 \ 3175 develop(intx, HugeMethodLimit, 8000, \ 3176 "don't compile methods larger than this if " \ 3177 "+DontCompileHugeMethods") \ 3178 \ 3179 /* New JDK 1.4 reflection implementation */ \ 3180 \ 3181 develop(bool, UseNewReflection, true, \ 3182 "Temporary flag for transition to reflection based on dynamic " \ 3183 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3184 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3185 "changes were needed") \ 3186 \ 3187 develop(bool, VerifyReflectionBytecodes, false, \ 3188 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3189 "in situations like that described in 4486457 or for " \ 3190 "constructors generated for serialization, so can not be enabled "\ 3191 "in product.") \ 3192 \ 3193 product(bool, ReflectionWrapResolutionErrors, true, \ 3194 "Temporary flag for transition to AbstractMethodError wrapped " \ 3195 "in InvocationTargetException. See 6531596") \ 3196 \ 3197 \ 3198 develop(intx, FastSuperclassLimit, 8, \ 3199 "Depth of hardwired instanceof accelerator array") \ 3200 \ 3201 /* Properties for Java libraries */ \ 3202 \ 3203 product(intx, MaxDirectMemorySize, -1, \ 3204 "Maximum total size of NIO direct-buffer allocations") \ 3205 \ 3206 /* temporary developer defined flags */ \ 3207 \ 3208 diagnostic(bool, UseNewCode, false, \ 3209 "Testing Only: Use the new version while testing") \ 3210 \ 3211 diagnostic(bool, UseNewCode2, false, \ 3212 "Testing Only: Use the new version while testing") \ 3213 \ 3214 diagnostic(bool, UseNewCode3, false, \ 3215 "Testing Only: Use the new version while testing") \ 3216 \ 3217 /* flags for performance data collection */ \ 3218 \ 3219 product(bool, UsePerfData, true, \ 3220 "Flag to disable jvmstat instrumentation for performance testing" \ 3221 "and problem isolation purposes.") \ 3222 \ 3223 product(bool, PerfDataSaveToFile, false, \ 3224 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3225 \ 3226 product(ccstr, PerfDataSaveFile, NULL, \ 3227 "Save PerfData memory to the specified absolute pathname," \ 3228 "%p in the file name if present will be replaced by pid") \ 3229 \ 3230 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3231 "Data sampling interval in milliseconds") \ 3232 \ 3233 develop(bool, PerfTraceDataCreation, false, \ 3234 "Trace creation of Performance Data Entries") \ 3235 \ 3236 develop(bool, PerfTraceMemOps, false, \ 3237 "Trace PerfMemory create/attach/detach calls") \ 3238 \ 3239 product(bool, PerfDisableSharedMem, false, \ 3240 "Store performance data in standard memory") \ 3241 \ 3242 product(intx, PerfDataMemorySize, 32*K, \ 3243 "Size of performance data memory region. Will be rounded " \ 3244 "up to a multiple of the native os page size.") \ 3245 \ 3246 product(intx, PerfMaxStringConstLength, 1024, \ 3247 "Maximum PerfStringConstant string length before truncation") \ 3248 \ 3249 product(bool, PerfAllowAtExitRegistration, false, \ 3250 "Allow registration of atexit() methods") \ 3251 \ 3252 product(bool, PerfBypassFileSystemCheck, false, \ 3253 "Bypass Win32 file system criteria checks (Windows Only)") \ 3254 \ 3255 product(intx, UnguardOnExecutionViolation, 0, \ 3256 "Unguard page and retry on no-execute fault (Win32 only)" \ 3257 "0=off, 1=conservative, 2=aggressive") \ 3258 \ 3259 /* Serviceability Support */ \ 3260 \ 3261 product(bool, ManagementServer, false, \ 3262 "Create JMX Management Server") \ 3263 \ 3264 product(bool, DisableAttachMechanism, false, \ 3265 "Disable mechanism that allows tools to attach to this VM") \ 3266 \ 3267 product(bool, StartAttachListener, false, \ 3268 "Always start Attach Listener at VM startup") \ 3269 \ 3270 manageable(bool, PrintConcurrentLocks, false, \ 3271 "Print java.util.concurrent locks in thread dump") \ 3272 \ 3273 /* Shared spaces */ \ 3274 \ 3275 product(bool, UseSharedSpaces, true, \ 3276 "Use shared spaces in the permanent generation") \ 3277 \ 3278 product(bool, RequireSharedSpaces, false, \ 3279 "Require shared spaces in the permanent generation") \ 3280 \ 3281 product(bool, ForceSharedSpaces, false, \ 3282 "Require shared spaces in the permanent generation") \ 3283 \ 3284 product(bool, DumpSharedSpaces, false, \ 3285 "Special mode: JVM reads a class list, loads classes, builds " \ 3286 "shared spaces, and dumps the shared spaces to a file to be " \ 3287 "used in future JVM runs.") \ 3288 \ 3289 product(bool, PrintSharedSpaces, false, \ 3290 "Print usage of shared spaces") \ 3291 \ 3292 product(uintx, SharedDummyBlockSize, 512*M, \ 3293 "Size of dummy block used to shift heap addresses (in bytes)") \ 3294 \ 3295 product(uintx, SharedReadWriteSize, 12*M, \ 3296 "Size of read-write space in permanent generation (in bytes)") \ 3297 \ 3298 product(uintx, SharedReadOnlySize, 10*M, \ 3299 "Size of read-only space in permanent generation (in bytes)") \ 3300 \ 3301 product(uintx, SharedMiscDataSize, 4*M, \ 3302 "Size of the shared data area adjacent to the heap (in bytes)") \ 3303 \ 3304 product(uintx, SharedMiscCodeSize, 4*M, \ 3305 "Size of the shared code area adjacent to the heap (in bytes)") \ 3306 \ 3307 diagnostic(bool, SharedOptimizeColdStart, true, \ 3308 "At dump time, order shared objects to achieve better " \ 3309 "cold startup time.") \ 3310 \ 3311 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3312 "Reordering policy for SharedOptimizeColdStart " \ 3313 "0=favor classload-time locality, 1=balanced, " \ 3314 "2=favor runtime locality") \ 3315 \ 3316 diagnostic(bool, SharedSkipVerify, false, \ 3317 "Skip assert() and verify() which page-in unwanted shared " \ 3318 "objects. ") \ 3319 \ 3320 product(bool, AnonymousClasses, false, \ 3321 "support sun.misc.Unsafe.defineAnonymousClass") \ 3322 \ 3323 experimental(bool, EnableMethodHandles, false, \ 3324 "support method handles (true by default under JSR 292)") \ 3325 \ 3326 diagnostic(intx, MethodHandlePushLimit, 3, \ 3327 "number of additional stack slots a method handle may push") \ 3328 \ 3329 develop(bool, TraceMethodHandles, false, \ 3330 "trace internal method handle operations") \ 3331 \ 3332 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3333 "perform extra checks when constructing method handles") \ 3334 \ 3335 diagnostic(bool, OptimizeMethodHandles, true, \ 3336 "when constructing method handles, try to improve them") \ 3337 \ 3338 experimental(bool, EnableInvokeDynamic, false, \ 3339 "recognize the invokedynamic instruction") \ 3340 \ 3341 develop(bool, TraceInvokeDynamic, false, \ 3342 "trace internal invoke dynamic operations") \ 3343 \ 3344 product(bool, TaggedStackInterpreter, false, \ 3345 "Insert tags in interpreter execution stack for oopmap generaion")\ 3346 \ 3347 diagnostic(bool, PauseAtStartup, false, \ 3348 "Causes the VM to pause at startup time and wait for the pause " \ 3349 "file to be removed (default: ./vm.paused.<pid>)") \ 3350 \ 3351 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3352 "The file to create and for whose removal to await when pausing " \ 3353 "at startup. (default: ./vm.paused.<pid>)") \ 3354 \ 3355 product(bool, ExtendedDTraceProbes, false, \ 3356 "Enable performance-impacting dtrace probes") \ 3357 \ 3358 product(bool, DTraceMethodProbes, false, \ 3359 "Enable dtrace probes for method-entry and method-exit") \ 3360 \ 3361 product(bool, DTraceAllocProbes, false, \ 3362 "Enable dtrace probes for object allocation") \ 3363 \ 3364 product(bool, DTraceMonitorProbes, false, \ 3365 "Enable dtrace probes for monitor events") \ 3366 \ 3367 product(bool, RelaxAccessControlCheck, false, \ 3368 "Relax the access control checks in the verifier") \ 3369 \ 3370 diagnostic(bool, PrintDTraceDOF, false, \ 3371 "Print the DTrace DOF passed to the system for JSDT probes") \ 3372 \ 3373 product(bool, UseVMInterruptibleIO, false, \ 3374 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3375 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3376 " of this flag is true for JDK 6 and earliers") 3377 3378 3379/* 3380 * Macros for factoring of globals 3381 */ 3382 3383// Interface macros 3384#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3385#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3386#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3387#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3388#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3389#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3390#ifdef PRODUCT 3391#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3392#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3393#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3394#else 3395#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3396#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3397#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3398#endif 3399// Special LP64 flags, product only needed for now. 3400#ifdef _LP64 3401#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3402#else 3403#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3404#endif // _LP64 3405 3406// Implementation macros 3407#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3408#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3409#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3410#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3411#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3412#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3413#ifdef PRODUCT 3414#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3415#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3416#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3417#else 3418#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3419#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3420#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3421#endif 3422#ifdef _LP64 3423#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3424#else 3425#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3426#endif // _LP64 3427 3428RUNTIME_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) 3429 3430RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3431