globals.hpp revision 1458:bfe29ec02863
1/* 2 * Copyright 1997-2010 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#if !defined(COMPILER1) && !defined(COMPILER2) 26define_pd_global(bool, BackgroundCompilation, false); 27define_pd_global(bool, UseTLAB, false); 28define_pd_global(bool, CICompileOSR, false); 29define_pd_global(bool, UseTypeProfile, false); 30define_pd_global(bool, UseOnStackReplacement, false); 31define_pd_global(bool, InlineIntrinsics, false); 32define_pd_global(bool, PreferInterpreterNativeStubs, true); 33define_pd_global(bool, ProfileInterpreter, false); 34define_pd_global(bool, ProfileTraps, false); 35define_pd_global(bool, TieredCompilation, false); 36 37define_pd_global(intx, CompileThreshold, 0); 38define_pd_global(intx, Tier2CompileThreshold, 0); 39define_pd_global(intx, Tier3CompileThreshold, 0); 40define_pd_global(intx, Tier4CompileThreshold, 0); 41 42define_pd_global(intx, BackEdgeThreshold, 0); 43define_pd_global(intx, Tier2BackEdgeThreshold, 0); 44define_pd_global(intx, Tier3BackEdgeThreshold, 0); 45define_pd_global(intx, Tier4BackEdgeThreshold, 0); 46 47define_pd_global(intx, OnStackReplacePercentage, 0); 48define_pd_global(bool, ResizeTLAB, false); 49define_pd_global(intx, FreqInlineSize, 0); 50define_pd_global(intx, InlineSmallCode, 0); 51define_pd_global(intx, NewSizeThreadIncrease, 4*K); 52define_pd_global(intx, InlineClassNatives, true); 53define_pd_global(intx, InlineUnsafeOps, true); 54define_pd_global(intx, InitialCodeCacheSize, 160*K); 55define_pd_global(intx, ReservedCodeCacheSize, 32*M); 56define_pd_global(intx, CodeCacheExpansionSize, 32*K); 57define_pd_global(intx, CodeCacheMinBlockLength, 1); 58define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 59define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 60define_pd_global(bool, NeverActAsServerClassMachine, true); 61define_pd_global(uint64_t,MaxRAM, 1ULL*G); 62#define CI_COMPILER_COUNT 0 63#else 64 65#ifdef COMPILER2 66#define CI_COMPILER_COUNT 2 67#else 68#define CI_COMPILER_COUNT 1 69#endif // COMPILER2 70 71#endif // no compilers 72 73 74// string type aliases used only in this file 75typedef const char* ccstr; 76typedef const char* ccstrlist; // represents string arguments which accumulate 77 78enum FlagValueOrigin { 79 DEFAULT = 0, 80 COMMAND_LINE = 1, 81 ENVIRON_VAR = 2, 82 CONFIG_FILE = 3, 83 MANAGEMENT = 4, 84 ERGONOMIC = 5, 85 ATTACH_ON_DEMAND = 6, 86 INTERNAL = 99 87}; 88 89struct Flag { 90 const char *type; 91 const char *name; 92 void* addr; 93 const char *kind; 94 FlagValueOrigin origin; 95 96 // points to all Flags static array 97 static Flag *flags; 98 99 // number of flags 100 static size_t numFlags; 101 102 static Flag* find_flag(char* name, size_t length); 103 104 bool is_bool() const { return strcmp(type, "bool") == 0; } 105 bool get_bool() const { return *((bool*) addr); } 106 void set_bool(bool value) { *((bool*) addr) = value; } 107 108 bool is_intx() const { return strcmp(type, "intx") == 0; } 109 intx get_intx() const { return *((intx*) addr); } 110 void set_intx(intx value) { *((intx*) addr) = value; } 111 112 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 113 uintx get_uintx() const { return *((uintx*) addr); } 114 void set_uintx(uintx value) { *((uintx*) addr) = value; } 115 116 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 117 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 118 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 119 120 bool is_double() const { return strcmp(type, "double") == 0; } 121 double get_double() const { return *((double*) addr); } 122 void set_double(double value) { *((double*) addr) = value; } 123 124 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 125 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 126 ccstr get_ccstr() const { return *((ccstr*) addr); } 127 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 128 129 bool is_unlocker() const; 130 bool is_unlocked() const; 131 bool is_writeable() const; 132 bool is_external() const; 133 134 void print_on(outputStream* st); 135 void print_as_flag(outputStream* st); 136}; 137 138// debug flags control various aspects of the VM and are global accessible 139 140// use FlagSetting to temporarily change some debug flag 141// e.g. FlagSetting fs(DebugThisAndThat, true); 142// restored to previous value upon leaving scope 143class FlagSetting { 144 bool val; 145 bool* flag; 146 public: 147 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 148 ~FlagSetting() { *flag = val; } 149}; 150 151 152class CounterSetting { 153 intx* counter; 154 public: 155 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 156 ~CounterSetting() { (*counter)--; } 157}; 158 159 160class IntFlagSetting { 161 intx val; 162 intx* flag; 163 public: 164 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 165 ~IntFlagSetting() { *flag = val; } 166}; 167 168 169class DoubleFlagSetting { 170 double val; 171 double* flag; 172 public: 173 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 174 ~DoubleFlagSetting() { *flag = val; } 175}; 176 177 178class CommandLineFlags { 179 public: 180 static bool boolAt(char* name, size_t len, bool* value); 181 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 182 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 183 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 184 185 static bool intxAt(char* name, size_t len, intx* value); 186 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 187 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 188 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 189 190 static bool uintxAt(char* name, size_t len, uintx* value); 191 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 192 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 193 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 194 195 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 196 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 197 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 198 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 199 200 static bool doubleAt(char* name, size_t len, double* value); 201 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 202 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 203 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 204 205 static bool ccstrAt(char* name, size_t len, ccstr* value); 206 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 207 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 208 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 209 210 // Returns false if name is not a command line flag. 211 static bool wasSetOnCmdline(const char* name, bool* value); 212 static void printSetFlags(); 213 214 static void printFlags(); 215 216 static void verify() PRODUCT_RETURN; 217}; 218 219// use this for flags that are true by default in the debug version but 220// false in the optimized version, and vice versa 221#ifdef ASSERT 222#define trueInDebug true 223#define falseInDebug false 224#else 225#define trueInDebug false 226#define falseInDebug true 227#endif 228 229// use this for flags that are true per default in the product build 230// but false in development builds, and vice versa 231#ifdef PRODUCT 232#define trueInProduct true 233#define falseInProduct false 234#else 235#define trueInProduct false 236#define falseInProduct true 237#endif 238 239// use this for flags that are true per default in the tiered build 240// but false in non-tiered builds, and vice versa 241#ifdef TIERED 242#define trueInTiered true 243#define falseInTiered false 244#else 245#define trueInTiered false 246#define falseInTiered true 247#endif 248 249// develop flags are settable / visible only during development and are constant in the PRODUCT version 250// product flags are always settable / visible 251// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 252 253// A flag must be declared with one of the following types: 254// bool, intx, uintx, ccstr. 255// The type "ccstr" is an alias for "const char*" and is used 256// only in this file, because the macrology requires single-token type names. 257 258// Note: Diagnostic options not meant for VM tuning or for product modes. 259// They are to be used for VM quality assurance or field diagnosis 260// of VM bugs. They are hidden so that users will not be encouraged to 261// try them as if they were VM ordinary execution options. However, they 262// are available in the product version of the VM. Under instruction 263// from support engineers, VM customers can turn them on to collect 264// diagnostic information about VM problems. To use a VM diagnostic 265// option, you must first specify +UnlockDiagnosticVMOptions. 266// (This master switch also affects the behavior of -Xprintflags.) 267// 268// experimental flags are in support of features that are not 269// part of the officially supported product, but are available 270// for experimenting with. They could, for example, be performance 271// features that may not have undergone full or rigorous QA, but which may 272// help performance in some cases and released for experimentation 273// by the community of users and developers. This flag also allows one to 274// be able to build a fully supported product that nonetheless also 275// ships with some unsupported, lightly tested, experimental features. 276// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 277// UnlockExperimentalVMOptions flag, which allows the control and 278// modification of the experimental flags. 279// 280// manageable flags are writeable external product flags. 281// They are dynamically writeable through the JDK management interface 282// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 283// These flags are external exported interface (see CCC). The list of 284// manageable flags can be queried programmatically through the management 285// interface. 286// 287// A flag can be made as "manageable" only if 288// - the flag is defined in a CCC as an external exported interface. 289// - the VM implementation supports dynamic setting of the flag. 290// This implies that the VM must *always* query the flag variable 291// and not reuse state related to the flag state at any given time. 292// - you want the flag to be queried programmatically by the customers. 293// 294// product_rw flags are writeable internal product flags. 295// They are like "manageable" flags but for internal/private use. 296// The list of product_rw flags are internal/private flags which 297// may be changed/removed in a future release. It can be set 298// through the management interface to get/set value 299// when the name of flag is supplied. 300// 301// A flag can be made as "product_rw" only if 302// - the VM implementation supports dynamic setting of the flag. 303// This implies that the VM must *always* query the flag variable 304// and not reuse state related to the flag state at any given time. 305// 306// Note that when there is a need to support develop flags to be writeable, 307// it can be done in the same way as product_rw. 308 309#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 310 \ 311 lp64_product(bool, UseCompressedOops, false, \ 312 "Use 32-bit object references in 64-bit VM. " \ 313 "lp64_product means flag is always constant in 32 bit VM") \ 314 \ 315 notproduct(bool, CheckCompressedOops, true, \ 316 "generate checks in encoding/decoding code in debug VM") \ 317 \ 318 product_pd(uintx, HeapBaseMinAddress, \ 319 "OS specific low limit for heap base address") \ 320 \ 321 diagnostic(bool, PrintCompressedOopsMode, false, \ 322 "Print compressed oops base address and encoding mode") \ 323 \ 324 /* UseMembar is theoretically a temp flag used for memory barrier \ 325 * removal testing. It was supposed to be removed before FCS but has \ 326 * been re-added (see 6401008) */ \ 327 product(bool, UseMembar, false, \ 328 "(Unstable) Issues membars on thread state transitions") \ 329 \ 330 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 331 "Enable normal processing of flags relating to field diagnostics")\ 332 \ 333 experimental(bool, UnlockExperimentalVMOptions, false, \ 334 "Enable normal processing of flags relating to experimental features")\ 335 \ 336 product(bool, JavaMonitorsInStackTrace, true, \ 337 "Print info. about Java monitor locks when the stacks are dumped")\ 338 \ 339 product_pd(bool, UseLargePages, \ 340 "Use large page memory") \ 341 \ 342 product_pd(bool, UseLargePagesIndividualAllocation, \ 343 "Allocate large pages individually for better affinity") \ 344 \ 345 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 346 "Fail large pages individual allocation") \ 347 \ 348 develop(bool, TracePageSizes, false, \ 349 "Trace page size selection and usage.") \ 350 \ 351 product(bool, UseNUMA, false, \ 352 "Use NUMA if available") \ 353 \ 354 product(bool, ForceNUMA, false, \ 355 "Force NUMA optimizations on single-node/UMA systems") \ 356 \ 357 product(intx, NUMAChunkResizeWeight, 20, \ 358 "Percentage (0-100) used to weight the current sample when " \ 359 "computing exponentially decaying average for " \ 360 "AdaptiveNUMAChunkSizing") \ 361 \ 362 product(intx, NUMASpaceResizeRate, 1*G, \ 363 "Do not reallocate more that this amount per collection") \ 364 \ 365 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 366 "Enable adaptive chunk sizing for NUMA") \ 367 \ 368 product(bool, NUMAStats, false, \ 369 "Print NUMA stats in detailed heap information") \ 370 \ 371 product(intx, NUMAPageScanRate, 256, \ 372 "Maximum number of pages to include in the page scan procedure") \ 373 \ 374 product_pd(bool, NeedsDeoptSuspend, \ 375 "True for register window machines (sparc/ia64)") \ 376 \ 377 product(intx, UseSSE, 99, \ 378 "Highest supported SSE instructions set on x86/x64") \ 379 \ 380 product(uintx, LargePageSizeInBytes, 0, \ 381 "Large page size (0 to let VM choose the page size") \ 382 \ 383 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 384 "Use large pages if max heap is at least this big") \ 385 \ 386 product(bool, ForceTimeHighResolution, false, \ 387 "Using high time resolution(For Win32 only)") \ 388 \ 389 develop(bool, TraceItables, false, \ 390 "Trace initialization and use of itables") \ 391 \ 392 develop(bool, TracePcPatching, false, \ 393 "Trace usage of frame::patch_pc") \ 394 \ 395 develop(bool, TraceJumps, false, \ 396 "Trace assembly jumps in thread ring buffer") \ 397 \ 398 develop(bool, TraceRelocator, false, \ 399 "Trace the bytecode relocator") \ 400 \ 401 develop(bool, TraceLongCompiles, false, \ 402 "Print out every time compilation is longer than " \ 403 "a given threashold") \ 404 \ 405 develop(bool, SafepointALot, false, \ 406 "Generates a lot of safepoints. Works with " \ 407 "GuaranteedSafepointInterval") \ 408 \ 409 product_pd(bool, BackgroundCompilation, \ 410 "A thread requesting compilation is not blocked during " \ 411 "compilation") \ 412 \ 413 product(bool, PrintVMQWaitTime, false, \ 414 "Prints out the waiting time in VM operation queue") \ 415 \ 416 develop(bool, BailoutToInterpreterForThrows, false, \ 417 "Compiled methods which throws/catches exceptions will be " \ 418 "deopt and intp.") \ 419 \ 420 develop(bool, NoYieldsInMicrolock, false, \ 421 "Disable yields in microlock") \ 422 \ 423 develop(bool, TraceOopMapGeneration, false, \ 424 "Shows oopmap generation") \ 425 \ 426 product(bool, MethodFlushing, true, \ 427 "Reclamation of zombie and not-entrant methods") \ 428 \ 429 develop(bool, VerifyStack, false, \ 430 "Verify stack of each thread when it is entering a runtime call") \ 431 \ 432 develop(bool, ForceUnreachable, false, \ 433 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 434 \ 435 notproduct(bool, StressDerivedPointers, false, \ 436 "Force scavenge when a derived pointers is detected on stack " \ 437 "after rtm call") \ 438 \ 439 develop(bool, TraceDerivedPointers, false, \ 440 "Trace traversal of derived pointers on stack") \ 441 \ 442 notproduct(bool, TraceCodeBlobStacks, false, \ 443 "Trace stack-walk of codeblobs") \ 444 \ 445 product(bool, PrintJNIResolving, false, \ 446 "Used to implement -v:jni") \ 447 \ 448 notproduct(bool, PrintRewrites, false, \ 449 "Print methods that are being rewritten") \ 450 \ 451 product(bool, UseInlineCaches, true, \ 452 "Use Inline Caches for virtual calls ") \ 453 \ 454 develop(bool, InlineArrayCopy, true, \ 455 "inline arraycopy native that is known to be part of " \ 456 "base library DLL") \ 457 \ 458 develop(bool, InlineObjectHash, true, \ 459 "inline Object::hashCode() native that is known to be part " \ 460 "of base library DLL") \ 461 \ 462 develop(bool, InlineObjectCopy, true, \ 463 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 464 \ 465 develop(bool, InlineNatives, true, \ 466 "inline natives that are known to be part of base library DLL") \ 467 \ 468 develop(bool, InlineMathNatives, true, \ 469 "inline SinD, CosD, etc.") \ 470 \ 471 develop(bool, InlineClassNatives, true, \ 472 "inline Class.isInstance, etc") \ 473 \ 474 develop(bool, InlineAtomicLong, true, \ 475 "inline sun.misc.AtomicLong") \ 476 \ 477 develop(bool, InlineThreadNatives, true, \ 478 "inline Thread.currentThread, etc") \ 479 \ 480 develop(bool, InlineReflectionGetCallerClass, true, \ 481 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 482 "of base library DLL") \ 483 \ 484 develop(bool, InlineUnsafeOps, true, \ 485 "inline memory ops (native methods) from sun.misc.Unsafe") \ 486 \ 487 develop(bool, ConvertCmpD2CmpF, true, \ 488 "Convert cmpD to cmpF when one input is constant in float range") \ 489 \ 490 develop(bool, ConvertFloat2IntClipping, true, \ 491 "Convert float2int clipping idiom to integer clipping") \ 492 \ 493 develop(bool, SpecialStringCompareTo, true, \ 494 "special version of string compareTo") \ 495 \ 496 develop(bool, SpecialStringIndexOf, true, \ 497 "special version of string indexOf") \ 498 \ 499 develop(bool, SpecialStringEquals, true, \ 500 "special version of string equals") \ 501 \ 502 develop(bool, SpecialArraysEquals, true, \ 503 "special version of Arrays.equals(char[],char[])") \ 504 \ 505 product(bool, UseSSE42Intrinsics, false, \ 506 "SSE4.2 versions of intrinsics") \ 507 \ 508 develop(bool, TraceCallFixup, false, \ 509 "traces all call fixups") \ 510 \ 511 develop(bool, DeoptimizeALot, false, \ 512 "deoptimize at every exit from the runtime system") \ 513 \ 514 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 515 "a comma separated list of bcis to deoptimize at") \ 516 \ 517 product(bool, DeoptimizeRandom, false, \ 518 "deoptimize random frames on random exit from the runtime system")\ 519 \ 520 notproduct(bool, ZombieALot, false, \ 521 "creates zombies (non-entrant) at exit from the runt. system") \ 522 \ 523 notproduct(bool, WalkStackALot, false, \ 524 "trace stack (no print) at every exit from the runtime system") \ 525 \ 526 develop(bool, Debugging, false, \ 527 "set when executing debug methods in debug.ccp " \ 528 "(to prevent triggering assertions)") \ 529 \ 530 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 531 "Enable strict checks that safepoints cannot happen for threads " \ 532 "that used No_Safepoint_Verifier") \ 533 \ 534 notproduct(bool, VerifyLastFrame, false, \ 535 "Verify oops on last frame on entry to VM") \ 536 \ 537 develop(bool, TraceHandleAllocation, false, \ 538 "Prints out warnings when suspicious many handles are allocated") \ 539 \ 540 product(bool, UseCompilerSafepoints, true, \ 541 "Stop at safepoints in compiled code") \ 542 \ 543 product(bool, UseSplitVerifier, true, \ 544 "use split verifier with StackMapTable attributes") \ 545 \ 546 product(bool, FailOverToOldVerifier, true, \ 547 "fail over to old verifier when split verifier fails") \ 548 \ 549 develop(bool, ShowSafepointMsgs, false, \ 550 "Show msg. about safepoint synch.") \ 551 \ 552 product(bool, SafepointTimeout, false, \ 553 "Time out and warn or fail after SafepointTimeoutDelay " \ 554 "milliseconds if failed to reach safepoint") \ 555 \ 556 develop(bool, DieOnSafepointTimeout, false, \ 557 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 558 \ 559 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 560 /* typically, at most a few retries are needed */ \ 561 product(intx, SuspendRetryCount, 50, \ 562 "Maximum retry count for an external suspend request") \ 563 \ 564 product(intx, SuspendRetryDelay, 5, \ 565 "Milliseconds to delay per retry (* current_retry_count)") \ 566 \ 567 product(bool, AssertOnSuspendWaitFailure, false, \ 568 "Assert/Guarantee on external suspend wait failure") \ 569 \ 570 product(bool, TraceSuspendWaitFailures, false, \ 571 "Trace external suspend wait failures") \ 572 \ 573 product(bool, MaxFDLimit, true, \ 574 "Bump the number of file descriptors to max in solaris.") \ 575 \ 576 notproduct(bool, LogEvents, trueInDebug, \ 577 "Enable Event log") \ 578 \ 579 product(bool, BytecodeVerificationRemote, true, \ 580 "Enables the Java bytecode verifier for remote classes") \ 581 \ 582 product(bool, BytecodeVerificationLocal, false, \ 583 "Enables the Java bytecode verifier for local classes") \ 584 \ 585 develop(bool, ForceFloatExceptions, trueInDebug, \ 586 "Force exceptions on FP stack under/overflow") \ 587 \ 588 develop(bool, SoftMatchFailure, trueInProduct, \ 589 "If the DFA fails to match a node, print a message and bail out") \ 590 \ 591 develop(bool, VerifyStackAtCalls, false, \ 592 "Verify that the stack pointer is unchanged after calls") \ 593 \ 594 develop(bool, TraceJavaAssertions, false, \ 595 "Trace java language assertions") \ 596 \ 597 notproduct(bool, CheckAssertionStatusDirectives, false, \ 598 "temporary - see javaClasses.cpp") \ 599 \ 600 notproduct(bool, PrintMallocFree, false, \ 601 "Trace calls to C heap malloc/free allocation") \ 602 \ 603 notproduct(bool, PrintOopAddress, false, \ 604 "Always print the location of the oop") \ 605 \ 606 notproduct(bool, VerifyCodeCacheOften, false, \ 607 "Verify compiled-code cache often") \ 608 \ 609 develop(bool, ZapDeadCompiledLocals, false, \ 610 "Zap dead locals in compiler frames") \ 611 \ 612 notproduct(bool, ZapDeadLocalsOld, false, \ 613 "Zap dead locals (old version, zaps all frames when " \ 614 "entering the VM") \ 615 \ 616 notproduct(bool, CheckOopishValues, false, \ 617 "Warn if value contains oop ( requires ZapDeadLocals)") \ 618 \ 619 develop(bool, UseMallocOnly, false, \ 620 "use only malloc/free for allocation (no resource area/arena)") \ 621 \ 622 develop(bool, PrintMalloc, false, \ 623 "print all malloc/free calls") \ 624 \ 625 develop(bool, ZapResourceArea, trueInDebug, \ 626 "Zap freed resource/arena space with 0xABABABAB") \ 627 \ 628 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 629 "Zap freed VM handle space with 0xBCBCBCBC") \ 630 \ 631 develop(bool, ZapJNIHandleArea, trueInDebug, \ 632 "Zap freed JNI handle space with 0xFEFEFEFE") \ 633 \ 634 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 635 "Zap unused heap space with 0xBAADBABE") \ 636 \ 637 develop(bool, TraceZapUnusedHeapArea, false, \ 638 "Trace zapping of unused heap space") \ 639 \ 640 develop(bool, CheckZapUnusedHeapArea, false, \ 641 "Check zapping of unused heap space") \ 642 \ 643 develop(bool, ZapFillerObjects, trueInDebug, \ 644 "Zap filler objects with 0xDEAFBABE") \ 645 \ 646 develop(bool, PrintVMMessages, true, \ 647 "Print vm messages on console") \ 648 \ 649 product(bool, PrintGCApplicationConcurrentTime, false, \ 650 "Print the time the application has been running") \ 651 \ 652 product(bool, PrintGCApplicationStoppedTime, false, \ 653 "Print the time the application has been stopped") \ 654 \ 655 notproduct(uintx, ErrorHandlerTest, 0, \ 656 "If > 0, provokes an error after VM initialization; the value" \ 657 "determines which error to provoke. See test_error_handler()" \ 658 "in debug.cpp.") \ 659 \ 660 develop(bool, Verbose, false, \ 661 "Prints additional debugging information from other modes") \ 662 \ 663 develop(bool, PrintMiscellaneous, false, \ 664 "Prints uncategorized debugging information (requires +Verbose)") \ 665 \ 666 develop(bool, WizardMode, false, \ 667 "Prints much more debugging information") \ 668 \ 669 product(bool, ShowMessageBoxOnError, false, \ 670 "Keep process alive on VM fatal error") \ 671 \ 672 product_pd(bool, UseOSErrorReporting, \ 673 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 674 \ 675 product(bool, SuppressFatalErrorMessage, false, \ 676 "Do NO Fatal Error report [Avoid deadlock]") \ 677 \ 678 product(ccstrlist, OnError, "", \ 679 "Run user-defined commands on fatal error; see VMError.cpp " \ 680 "for examples") \ 681 \ 682 product(ccstrlist, OnOutOfMemoryError, "", \ 683 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 684 \ 685 manageable(bool, HeapDumpBeforeFullGC, false, \ 686 "Dump heap to file before any major stop-world GC") \ 687 \ 688 manageable(bool, HeapDumpAfterFullGC, false, \ 689 "Dump heap to file after any major stop-world GC") \ 690 \ 691 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 692 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 693 \ 694 manageable(ccstr, HeapDumpPath, NULL, \ 695 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 696 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 697 "in the working directory)") \ 698 \ 699 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 700 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 701 "when the heap usage is larger than this") \ 702 \ 703 develop(uintx, HeapDumpSegmentSize, 1*G, \ 704 "Approximate segment size when generating a segmented heap dump") \ 705 \ 706 develop(bool, BreakAtWarning, false, \ 707 "Execute breakpoint upon encountering VM warning") \ 708 \ 709 product_pd(bool, UseVectoredExceptions, \ 710 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 711 \ 712 develop(bool, TraceVMOperation, false, \ 713 "Trace vm operations") \ 714 \ 715 develop(bool, UseFakeTimers, false, \ 716 "Tells whether the VM should use system time or a fake timer") \ 717 \ 718 diagnostic(bool, LogCompilation, false, \ 719 "Log compilation activity in detail to hotspot.log or LogFile") \ 720 \ 721 product(bool, PrintCompilation, false, \ 722 "Print compilations") \ 723 \ 724 diagnostic(bool, TraceNMethodInstalls, false, \ 725 "Trace nmethod intallation") \ 726 \ 727 diagnostic(intx, ScavengeRootsInCode, 0, \ 728 "0: do not allow scavengable oops in the code cache; " \ 729 "1: allow scavenging from the code cache; " \ 730 "2: emit as many constants as the compiler can see") \ 731 \ 732 diagnostic(bool, TraceOSRBreakpoint, false, \ 733 "Trace OSR Breakpoint ") \ 734 \ 735 diagnostic(bool, TraceCompileTriggered, false, \ 736 "Trace compile triggered") \ 737 \ 738 diagnostic(bool, TraceTriggers, false, \ 739 "Trace triggers") \ 740 \ 741 product(bool, AlwaysRestoreFPU, false, \ 742 "Restore the FPU control word after every JNI call (expensive)") \ 743 \ 744 notproduct(bool, PrintCompilation2, false, \ 745 "Print additional statistics per compilation") \ 746 \ 747 diagnostic(bool, PrintAdapterHandlers, false, \ 748 "Print code generated for i2c/c2i adapters") \ 749 \ 750 develop(bool, VerifyAdapterSharing, false, \ 751 "Verify that the code for shared adapters is the equivalent") \ 752 \ 753 diagnostic(bool, PrintAssembly, false, \ 754 "Print assembly code (using external disassembler.so)") \ 755 \ 756 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 757 "Options string passed to disassembler.so") \ 758 \ 759 diagnostic(bool, PrintNMethods, false, \ 760 "Print assembly code for nmethods when generated") \ 761 \ 762 diagnostic(bool, PrintNativeNMethods, false, \ 763 "Print assembly code for native nmethods when generated") \ 764 \ 765 develop(bool, PrintDebugInfo, false, \ 766 "Print debug information for all nmethods when generated") \ 767 \ 768 develop(bool, PrintRelocations, false, \ 769 "Print relocation information for all nmethods when generated") \ 770 \ 771 develop(bool, PrintDependencies, false, \ 772 "Print dependency information for all nmethods when generated") \ 773 \ 774 develop(bool, PrintExceptionHandlers, false, \ 775 "Print exception handler tables for all nmethods when generated") \ 776 \ 777 develop(bool, InterceptOSException, false, \ 778 "Starts debugger when an implicit OS (e.g., NULL) " \ 779 "exception happens") \ 780 \ 781 notproduct(bool, PrintCodeCache, false, \ 782 "Print the compiled_code cache when exiting") \ 783 \ 784 develop(bool, PrintCodeCache2, false, \ 785 "Print detailed info on the compiled_code cache when exiting") \ 786 \ 787 diagnostic(bool, PrintStubCode, false, \ 788 "Print generated stub code") \ 789 \ 790 product(bool, StackTraceInThrowable, true, \ 791 "Collect backtrace in throwable when exception happens") \ 792 \ 793 product(bool, OmitStackTraceInFastThrow, true, \ 794 "Omit backtraces for some 'hot' exceptions in optimized code") \ 795 \ 796 product(bool, ProfilerPrintByteCodeStatistics, false, \ 797 "Prints byte code statictics when dumping profiler output") \ 798 \ 799 product(bool, ProfilerRecordPC, false, \ 800 "Collects tick for each 16 byte interval of compiled code") \ 801 \ 802 product(bool, ProfileVM, false, \ 803 "Profiles ticks that fall within VM (either in the VM Thread " \ 804 "or VM code called through stubs)") \ 805 \ 806 product(bool, ProfileIntervals, false, \ 807 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 808 \ 809 notproduct(bool, ProfilerCheckIntervals, false, \ 810 "Collect and print info on spacing of profiler ticks") \ 811 \ 812 develop(bool, PrintJVMWarnings, false, \ 813 "Prints warnings for unimplemented JVM functions") \ 814 \ 815 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 816 "Prints warnings for stalled SpinLocks") \ 817 \ 818 develop(bool, InitializeJavaLangSystem, true, \ 819 "Initialize java.lang.System - turn off for individual " \ 820 "method debugging") \ 821 \ 822 develop(bool, InitializeJavaLangString, true, \ 823 "Initialize java.lang.String - turn off for individual " \ 824 "method debugging") \ 825 \ 826 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 827 "Initialize various error and exception classes - turn off for " \ 828 "individual method debugging") \ 829 \ 830 product(bool, RegisterFinalizersAtInit, true, \ 831 "Register finalizable objects at end of Object.<init> or " \ 832 "after allocation") \ 833 \ 834 develop(bool, RegisterReferences, true, \ 835 "Tells whether the VM should register soft/weak/final/phantom " \ 836 "references") \ 837 \ 838 develop(bool, IgnoreRewrites, false, \ 839 "Supress rewrites of bytecodes in the oopmap generator. " \ 840 "This is unsafe!") \ 841 \ 842 develop(bool, PrintCodeCacheExtension, false, \ 843 "Print extension of code cache") \ 844 \ 845 develop(bool, UsePrivilegedStack, true, \ 846 "Enable the security JVM functions") \ 847 \ 848 develop(bool, IEEEPrecision, true, \ 849 "Enables IEEE precision (for INTEL only)") \ 850 \ 851 develop(bool, ProtectionDomainVerification, true, \ 852 "Verifies protection domain before resolution in system " \ 853 "dictionary") \ 854 \ 855 product(bool, ClassUnloading, true, \ 856 "Do unloading of classes") \ 857 \ 858 diagnostic(bool, LinkWellKnownClasses, false, \ 859 "Resolve a well known class as soon as its name is seen") \ 860 \ 861 develop(bool, DisableStartThread, false, \ 862 "Disable starting of additional Java threads " \ 863 "(for debugging only)") \ 864 \ 865 develop(bool, MemProfiling, false, \ 866 "Write memory usage profiling to log file") \ 867 \ 868 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 869 "Prints the system dictionary at exit") \ 870 \ 871 diagnostic(bool, UnsyncloadClass, false, \ 872 "Unstable: VM calls loadClass unsynchronized. Custom " \ 873 "class loader must call VM synchronized for findClass " \ 874 "and defineClass.") \ 875 \ 876 product(bool, AlwaysLockClassLoader, false, \ 877 "Require the VM to acquire the class loader lock before calling " \ 878 "loadClass() even for class loaders registering " \ 879 "as parallel capable") \ 880 \ 881 product(bool, AllowParallelDefineClass, false, \ 882 "Allow parallel defineClass requests for class loaders " \ 883 "registering as parallel capable") \ 884 \ 885 product(bool, MustCallLoadClassInternal, false, \ 886 "Call loadClassInternal() rather than loadClass()") \ 887 \ 888 product_pd(bool, DontYieldALot, \ 889 "Throw away obvious excess yield calls (for SOLARIS only)") \ 890 \ 891 product_pd(bool, ConvertSleepToYield, \ 892 "Converts sleep(0) to thread yield " \ 893 "(may be off for SOLARIS to improve GUI)") \ 894 \ 895 product(bool, ConvertYieldToSleep, false, \ 896 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 897 "behavior (SOLARIS only)") \ 898 \ 899 product(bool, UseBoundThreads, true, \ 900 "Bind user level threads to kernel threads (for SOLARIS only)") \ 901 \ 902 develop(bool, UseDetachedThreads, true, \ 903 "Use detached threads that are recycled upon termination " \ 904 "(for SOLARIS only)") \ 905 \ 906 product(bool, UseLWPSynchronization, true, \ 907 "Use LWP-based instead of libthread-based synchronization " \ 908 "(SPARC only)") \ 909 \ 910 product(ccstr, SyncKnobs, NULL, \ 911 "(Unstable) Various monitor synchronization tunables") \ 912 \ 913 product(intx, EmitSync, 0, \ 914 "(Unsafe,Unstable) " \ 915 " Controls emission of inline sync fast-path code") \ 916 \ 917 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 918 \ 919 product(intx, Atomics, 0, \ 920 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 921 \ 922 product(intx, FenceInstruction, 0, \ 923 "(Unsafe,Unstable) Experimental") \ 924 \ 925 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 926 \ 927 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 928 \ 929 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 930 \ 931 product(intx, hashCode, 0, \ 932 "(Unstable) select hashCode generation algorithm" ) \ 933 \ 934 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 935 "(Unstable, Linux-specific)" \ 936 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 937 \ 938 product(bool, FilterSpuriousWakeups, true, \ 939 "Prevent spurious or premature wakeups from object.wait " \ 940 "(Solaris only)") \ 941 \ 942 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 943 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 944 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 945 \ 946 develop(bool, UsePthreads, false, \ 947 "Use pthread-based instead of libthread-based synchronization " \ 948 "(SPARC only)") \ 949 \ 950 product(bool, AdjustConcurrency, false, \ 951 "call thr_setconcurrency at thread create time to avoid " \ 952 "LWP starvation on MP systems (For Solaris Only)") \ 953 \ 954 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 955 "Should the system attempt to update the compiler file when " \ 956 "an error occurs?") \ 957 \ 958 product(bool, ReduceSignalUsage, false, \ 959 "Reduce the use of OS signals in Java and/or the VM") \ 960 \ 961 notproduct(bool, ValidateMarkSweep, false, \ 962 "Do extra validation during MarkSweep collection") \ 963 \ 964 notproduct(bool, RecordMarkSweepCompaction, false, \ 965 "Enable GC-to-GC recording and querying of compaction during " \ 966 "MarkSweep") \ 967 \ 968 develop_pd(bool, ShareVtableStubs, \ 969 "Share vtable stubs (smaller code but worse branch prediction") \ 970 \ 971 develop(bool, LoadLineNumberTables, true, \ 972 "Tells whether the class file parser loads line number tables") \ 973 \ 974 develop(bool, LoadLocalVariableTables, true, \ 975 "Tells whether the class file parser loads local variable tables")\ 976 \ 977 develop(bool, LoadLocalVariableTypeTables, true, \ 978 "Tells whether the class file parser loads local variable type tables")\ 979 \ 980 product(bool, AllowUserSignalHandlers, false, \ 981 "Do not complain if the application installs signal handlers " \ 982 "(Solaris & Linux only)") \ 983 \ 984 product(bool, UseSignalChaining, true, \ 985 "Use signal-chaining to invoke signal handlers installed " \ 986 "by the application (Solaris & Linux only)") \ 987 \ 988 product(bool, UseAltSigs, false, \ 989 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 990 "internal signals (Solaris only)") \ 991 \ 992 product(bool, UseSpinning, false, \ 993 "Use spinning in monitor inflation and before entry") \ 994 \ 995 product(bool, PreSpinYield, false, \ 996 "Yield before inner spinning loop") \ 997 \ 998 product(bool, PostSpinYield, true, \ 999 "Yield after inner spinning loop") \ 1000 \ 1001 product(bool, AllowJNIEnvProxy, false, \ 1002 "Allow JNIEnv proxies for jdbx") \ 1003 \ 1004 product(bool, JNIDetachReleasesMonitors, true, \ 1005 "JNI DetachCurrentThread releases monitors owned by thread") \ 1006 \ 1007 product(bool, RestoreMXCSROnJNICalls, false, \ 1008 "Restore MXCSR when returning from JNI calls") \ 1009 \ 1010 product(bool, CheckJNICalls, false, \ 1011 "Verify all arguments to JNI calls") \ 1012 \ 1013 product(bool, UseFastJNIAccessors, true, \ 1014 "Use optimized versions of Get<Primitive>Field") \ 1015 \ 1016 product(bool, EagerXrunInit, false, \ 1017 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1018 " but not all -Xrun libraries may support the state of the VM at this time") \ 1019 \ 1020 product(bool, PreserveAllAnnotations, false, \ 1021 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1022 \ 1023 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1024 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1025 \ 1026 product(bool, LazyBootClassLoader, true, \ 1027 "Enable/disable lazy opening of boot class path entries") \ 1028 \ 1029 diagnostic(bool, UseIncDec, true, \ 1030 "Use INC, DEC instructions on x86") \ 1031 \ 1032 product(bool, UseNewLongLShift, false, \ 1033 "Use optimized bitwise shift left") \ 1034 \ 1035 product(bool, UseStoreImmI16, true, \ 1036 "Use store immediate 16-bits value instruction on x86") \ 1037 \ 1038 product(bool, UseAddressNop, false, \ 1039 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1040 \ 1041 product(bool, UseXmmLoadAndClearUpper, true, \ 1042 "Load low part of XMM register and clear upper part") \ 1043 \ 1044 product(bool, UseXmmRegToRegMoveAll, false, \ 1045 "Copy all XMM register bits when moving value between registers") \ 1046 \ 1047 product(bool, UseXmmI2D, false, \ 1048 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1049 \ 1050 product(bool, UseXmmI2F, false, \ 1051 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1052 \ 1053 product(bool, UseXMMForArrayCopy, false, \ 1054 "Use SSE2 MOVQ instruction for Arraycopy") \ 1055 \ 1056 product(bool, UseUnalignedLoadStores, false, \ 1057 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1058 \ 1059 product(intx, FieldsAllocationStyle, 1, \ 1060 "0 - type based with oops first, 1 - with oops last, " \ 1061 "2 - oops in super and sub classes are together") \ 1062 \ 1063 product(bool, CompactFields, true, \ 1064 "Allocate nonstatic fields in gaps between previous fields") \ 1065 \ 1066 notproduct(bool, PrintCompactFieldsSavings, false, \ 1067 "Print how many words were saved with CompactFields") \ 1068 \ 1069 product(bool, UseBiasedLocking, true, \ 1070 "Enable biased locking in JVM") \ 1071 \ 1072 product(intx, BiasedLockingStartupDelay, 4000, \ 1073 "Number of milliseconds to wait before enabling biased locking") \ 1074 \ 1075 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1076 "Print statistics of biased locking in JVM") \ 1077 \ 1078 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1079 "Threshold of number of revocations per type to try to " \ 1080 "rebias all objects in the heap of that type") \ 1081 \ 1082 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1083 "Threshold of number of revocations per type to permanently " \ 1084 "revoke biases of all objects in the heap of that type") \ 1085 \ 1086 product(intx, BiasedLockingDecayTime, 25000, \ 1087 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1088 "type after previous bulk rebias") \ 1089 \ 1090 /* tracing */ \ 1091 \ 1092 notproduct(bool, TraceRuntimeCalls, false, \ 1093 "Trace run-time calls") \ 1094 \ 1095 develop(bool, TraceJNICalls, false, \ 1096 "Trace JNI calls") \ 1097 \ 1098 notproduct(bool, TraceJVMCalls, false, \ 1099 "Trace JVM calls") \ 1100 \ 1101 product(ccstr, TraceJVMTI, NULL, \ 1102 "Trace flags for JVMTI functions and events") \ 1103 \ 1104 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1105 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1106 \ 1107 /* This option can change an EMCP method into an obsolete method. */ \ 1108 /* This can affect tests that except specific methods to be EMCP. */ \ 1109 /* This option should be used with caution. */ \ 1110 product(bool, StressLdcRewrite, false, \ 1111 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1112 \ 1113 product(intx, TraceRedefineClasses, 0, \ 1114 "Trace level for JVMTI RedefineClasses") \ 1115 \ 1116 /* change to false by default sometime after Mustang */ \ 1117 product(bool, VerifyMergedCPBytecodes, true, \ 1118 "Verify bytecodes after RedefineClasses constant pool merging") \ 1119 \ 1120 develop(bool, TraceJNIHandleAllocation, false, \ 1121 "Trace allocation/deallocation of JNI handle blocks") \ 1122 \ 1123 develop(bool, TraceThreadEvents, false, \ 1124 "Trace all thread events") \ 1125 \ 1126 develop(bool, TraceBytecodes, false, \ 1127 "Trace bytecode execution") \ 1128 \ 1129 develop(bool, TraceClassInitialization, false, \ 1130 "Trace class initialization") \ 1131 \ 1132 develop(bool, TraceExceptions, false, \ 1133 "Trace exceptions") \ 1134 \ 1135 develop(bool, TraceICs, false, \ 1136 "Trace inline cache changes") \ 1137 \ 1138 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1139 "Trace method invocation counter overflow") \ 1140 \ 1141 develop(bool, TraceInlineCacheClearing, false, \ 1142 "Trace clearing of inline caches in nmethods") \ 1143 \ 1144 develop(bool, TraceDependencies, false, \ 1145 "Trace dependencies") \ 1146 \ 1147 develop(bool, VerifyDependencies, trueInDebug, \ 1148 "Exercise and verify the compilation dependency mechanism") \ 1149 \ 1150 develop(bool, TraceNewOopMapGeneration, false, \ 1151 "Trace OopMapGeneration") \ 1152 \ 1153 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1154 "Trace OopMapGeneration: print detailed cell states") \ 1155 \ 1156 develop(bool, TimeOopMap, false, \ 1157 "Time calls to GenerateOopMap::compute_map() in sum") \ 1158 \ 1159 develop(bool, TimeOopMap2, false, \ 1160 "Time calls to GenerateOopMap::compute_map() individually") \ 1161 \ 1162 develop(bool, TraceMonitorMismatch, false, \ 1163 "Trace monitor matching failures during OopMapGeneration") \ 1164 \ 1165 develop(bool, TraceOopMapRewrites, false, \ 1166 "Trace rewritting of method oops during oop map generation") \ 1167 \ 1168 develop(bool, TraceSafepoint, false, \ 1169 "Trace safepoint operations") \ 1170 \ 1171 develop(bool, TraceICBuffer, false, \ 1172 "Trace usage of IC buffer") \ 1173 \ 1174 develop(bool, TraceCompiledIC, false, \ 1175 "Trace changes of compiled IC") \ 1176 \ 1177 notproduct(bool, TraceZapDeadLocals, false, \ 1178 "Trace zapping dead locals") \ 1179 \ 1180 develop(bool, TraceStartupTime, false, \ 1181 "Trace setup time") \ 1182 \ 1183 develop(bool, TraceHPI, false, \ 1184 "Trace Host Porting Interface (HPI)") \ 1185 \ 1186 product(ccstr, HPILibPath, NULL, \ 1187 "Specify alternate path to HPI library") \ 1188 \ 1189 develop(bool, TraceProtectionDomainVerification, false, \ 1190 "Trace protection domain verifcation") \ 1191 \ 1192 develop(bool, TraceClearedExceptions, false, \ 1193 "Prints when an exception is forcibly cleared") \ 1194 \ 1195 product(bool, TraceClassResolution, false, \ 1196 "Trace all constant pool resolutions (for debugging)") \ 1197 \ 1198 product(bool, TraceBiasedLocking, false, \ 1199 "Trace biased locking in JVM") \ 1200 \ 1201 product(bool, TraceMonitorInflation, false, \ 1202 "Trace monitor inflation in JVM") \ 1203 \ 1204 /* assembler */ \ 1205 product(bool, Use486InstrsOnly, false, \ 1206 "Use 80486 Compliant instruction subset") \ 1207 \ 1208 /* gc */ \ 1209 \ 1210 product(bool, UseSerialGC, false, \ 1211 "Use the serial garbage collector") \ 1212 \ 1213 product(bool, UseG1GC, false, \ 1214 "Use the Garbage-First garbage collector") \ 1215 \ 1216 product(bool, UseParallelGC, false, \ 1217 "Use the Parallel Scavenge garbage collector") \ 1218 \ 1219 product(bool, UseParallelOldGC, false, \ 1220 "Use the Parallel Old garbage collector") \ 1221 \ 1222 product(bool, UseParallelOldGCCompacting, true, \ 1223 "In the Parallel Old garbage collector use parallel compaction") \ 1224 \ 1225 product(bool, UseParallelDensePrefixUpdate, true, \ 1226 "In the Parallel Old garbage collector use parallel dense" \ 1227 " prefix update") \ 1228 \ 1229 product(uintx, HeapMaximumCompactionInterval, 20, \ 1230 "How often should we maximally compact the heap (not allowing " \ 1231 "any dead space)") \ 1232 \ 1233 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1234 "The collection count for the first maximum compaction") \ 1235 \ 1236 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1237 "In the Parallel Old garbage collector maximum compaction for " \ 1238 "a system GC") \ 1239 \ 1240 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1241 "The mean used by the par compact dead wood" \ 1242 "limiter (a number between 0-100).") \ 1243 \ 1244 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1245 "The standard deviation used by the par compact dead wood" \ 1246 "limiter (a number between 0-100).") \ 1247 \ 1248 product(bool, UseParallelOldGCDensePrefix, true, \ 1249 "Use a dense prefix with the Parallel Old garbage collector") \ 1250 \ 1251 product(uintx, ParallelGCThreads, 0, \ 1252 "Number of parallel threads parallel gc will use") \ 1253 \ 1254 develop(bool, ParallelOldGCSplitALot, false, \ 1255 "Provoke splitting (copying data from a young gen space to" \ 1256 "multiple destination spaces)") \ 1257 \ 1258 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1259 "How often to provoke splitting a young gen space") \ 1260 \ 1261 develop(bool, TraceRegionTasksQueuing, false, \ 1262 "Trace the queuing of the region tasks") \ 1263 \ 1264 product(uintx, ConcGCThreads, 0, \ 1265 "Number of threads concurrent gc will use") \ 1266 \ 1267 product(uintx, YoungPLABSize, 4096, \ 1268 "Size of young gen promotion labs (in HeapWords)") \ 1269 \ 1270 product(uintx, OldPLABSize, 1024, \ 1271 "Size of old gen promotion labs (in HeapWords)") \ 1272 \ 1273 product(uintx, GCTaskTimeStampEntries, 200, \ 1274 "Number of time stamp entries per gc worker thread") \ 1275 \ 1276 product(bool, AlwaysTenure, false, \ 1277 "Always tenure objects in eden. (ParallelGC only)") \ 1278 \ 1279 product(bool, NeverTenure, false, \ 1280 "Never tenure objects in eden, May tenure on overflow " \ 1281 "(ParallelGC only)") \ 1282 \ 1283 product(bool, ScavengeBeforeFullGC, true, \ 1284 "Scavenge youngest generation before each full GC, " \ 1285 "used with UseParallelGC") \ 1286 \ 1287 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1288 "Allow scavenges to occur when to_space contains objects.") \ 1289 \ 1290 product(bool, UseConcMarkSweepGC, false, \ 1291 "Use Concurrent Mark-Sweep GC in the old generation") \ 1292 \ 1293 product(bool, ExplicitGCInvokesConcurrent, false, \ 1294 "A System.gc() request invokes a concurrent collection;" \ 1295 " (effective only when UseConcMarkSweepGC)") \ 1296 \ 1297 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1298 "A System.gc() request invokes a concurrent collection and " \ 1299 "also unloads classes during such a concurrent gc cycle " \ 1300 "(effective only when UseConcMarkSweepGC)") \ 1301 \ 1302 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1303 "Use Adaptive Free Lists in the CMS generation") \ 1304 \ 1305 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1306 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1307 \ 1308 develop(bool, RotateCMSCollectionTypes, false, \ 1309 "Rotate the CMS collections among concurrent and STW") \ 1310 \ 1311 product(bool, UseCMSBestFit, true, \ 1312 "Use CMS best fit allocation strategy") \ 1313 \ 1314 product(bool, UseCMSCollectionPassing, true, \ 1315 "Use passing of collection from background to foreground") \ 1316 \ 1317 product(bool, UseParNewGC, false, \ 1318 "Use parallel threads in the new generation.") \ 1319 \ 1320 product(bool, ParallelGCVerbose, false, \ 1321 "Verbose output for parallel GC.") \ 1322 \ 1323 product(intx, ParallelGCBufferWastePct, 10, \ 1324 "wasted fraction of parallel allocation buffer.") \ 1325 \ 1326 product(bool, ParallelGCRetainPLAB, true, \ 1327 "Retain parallel allocation buffers across scavenges.") \ 1328 \ 1329 product(intx, TargetPLABWastePct, 10, \ 1330 "target wasted space in last buffer as pct of overall allocation")\ 1331 \ 1332 product(uintx, PLABWeight, 75, \ 1333 "Percentage (0-100) used to weight the current sample when" \ 1334 "computing exponentially decaying average for ResizePLAB.") \ 1335 \ 1336 product(bool, ResizePLAB, true, \ 1337 "Dynamically resize (survivor space) promotion labs") \ 1338 \ 1339 product(bool, PrintPLAB, false, \ 1340 "Print (survivor space) promotion labs sizing decisions") \ 1341 \ 1342 product(intx, ParGCArrayScanChunk, 50, \ 1343 "Scan a subset and push remainder, if array is bigger than this") \ 1344 \ 1345 product(bool, ParGCUseLocalOverflow, false, \ 1346 "Instead of a global overflow list, use local overflow stacks") \ 1347 \ 1348 product(bool, ParGCTrimOverflow, true, \ 1349 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1350 \ 1351 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1352 "Whether we should simulate work queue overflow in ParNew") \ 1353 \ 1354 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1355 "An `interval' counter that determines how frequently " \ 1356 "we simulate overflow; a smaller number increases frequency") \ 1357 \ 1358 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1359 "The desired number of objects to claim from the overflow list") \ 1360 \ 1361 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1362 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1363 "parallel GC.") \ 1364 \ 1365 product(uintx, OldPLABWeight, 50, \ 1366 "Percentage (0-100) used to weight the current sample when" \ 1367 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1368 \ 1369 product(bool, ResizeOldPLAB, true, \ 1370 "Dynamically resize (old gen) promotion labs") \ 1371 \ 1372 product(bool, PrintOldPLAB, false, \ 1373 "Print (old gen) promotion labs sizing decisions") \ 1374 \ 1375 product(uintx, CMSOldPLABMin, 16, \ 1376 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1377 \ 1378 product(uintx, CMSOldPLABMax, 1024, \ 1379 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1380 \ 1381 product(uintx, CMSOldPLABNumRefills, 4, \ 1382 "Nominal number of refills of CMS gen promotion lab cache" \ 1383 " per worker per block size") \ 1384 \ 1385 product(bool, CMSOldPLABResizeQuicker, false, \ 1386 "Whether to react on-the-fly during a scavenge to a sudden" \ 1387 " change in block demand rate") \ 1388 \ 1389 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1390 "The tolerance of the phase-change detector for on-the-fly" \ 1391 " PLAB resizing during a scavenge") \ 1392 \ 1393 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1394 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1395 " during a scavenge") \ 1396 \ 1397 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1398 "The clamping of the gain in the feedback loop for on-the-fly" \ 1399 " PLAB resizing during a scavenge") \ 1400 \ 1401 product(bool, AlwaysPreTouch, false, \ 1402 "It forces all freshly committed pages to be pre-touched.") \ 1403 \ 1404 product(bool, CMSUseOldDefaults, false, \ 1405 "A flag temporarily introduced to allow reverting to some " \ 1406 "older default settings; older as of 6.0") \ 1407 \ 1408 product(intx, CMSYoungGenPerWorker, 16*M, \ 1409 "The amount of young gen chosen by default per GC worker " \ 1410 "thread available") \ 1411 \ 1412 product(bool, GCOverheadReporting, false, \ 1413 "Enables the GC overhead reporting facility") \ 1414 \ 1415 product(intx, GCOverheadReportingPeriodMS, 100, \ 1416 "Reporting period for conc GC overhead reporting, in ms ") \ 1417 \ 1418 product(bool, CMSIncrementalMode, false, \ 1419 "Whether CMS GC should operate in \"incremental\" mode") \ 1420 \ 1421 product(uintx, CMSIncrementalDutyCycle, 10, \ 1422 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1423 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1424 "value") \ 1425 \ 1426 product(bool, CMSIncrementalPacing, true, \ 1427 "Whether the CMS incremental mode duty cycle should be " \ 1428 "automatically adjusted") \ 1429 \ 1430 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1431 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1432 "enabled (a percentage, 0-100)") \ 1433 \ 1434 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1435 "Percentage (0-100) used to add conservatism when computing the " \ 1436 "duty cycle") \ 1437 \ 1438 product(uintx, CMSIncrementalOffset, 0, \ 1439 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1440 " is shifted to the right within the period between young GCs") \ 1441 \ 1442 product(uintx, CMSExpAvgFactor, 50, \ 1443 "Percentage (0-100) used to weight the current sample when" \ 1444 "computing exponential averages for CMS statistics.") \ 1445 \ 1446 product(uintx, CMS_FLSWeight, 75, \ 1447 "Percentage (0-100) used to weight the current sample when" \ 1448 "computing exponentially decating averages for CMS FLS statistics.") \ 1449 \ 1450 product(uintx, CMS_FLSPadding, 1, \ 1451 "The multiple of deviation from mean to use for buffering" \ 1452 "against volatility in free list demand.") \ 1453 \ 1454 product(uintx, FLSCoalescePolicy, 2, \ 1455 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1456 \ 1457 product(bool, FLSAlwaysCoalesceLarge, false, \ 1458 "CMS: Larger free blocks are always available for coalescing") \ 1459 \ 1460 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1461 "CMS: the smaller the percentage the greater the coalition force")\ 1462 \ 1463 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1464 "CMS: the factor by which to inflate estimated demand of small" \ 1465 " block sizes to prevent coalescing with an adjoining block") \ 1466 \ 1467 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1468 "CMS: the factor by which to inflate estimated demand of large" \ 1469 " block sizes to prevent coalescing with an adjoining block") \ 1470 \ 1471 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1472 "CMS: the factor by which to inflate estimated demand of small" \ 1473 " block sizes to prevent splitting to supply demand for smaller" \ 1474 " blocks") \ 1475 \ 1476 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1477 "CMS: the factor by which to inflate estimated demand of large" \ 1478 " block sizes to prevent splitting to supply demand for smaller" \ 1479 " blocks") \ 1480 \ 1481 product(bool, CMSExtrapolateSweep, false, \ 1482 "CMS: cushion for block demand during sweep") \ 1483 \ 1484 product(uintx, CMS_SweepWeight, 75, \ 1485 "Percentage (0-100) used to weight the current sample when " \ 1486 "computing exponentially decaying average for inter-sweep " \ 1487 "duration") \ 1488 \ 1489 product(uintx, CMS_SweepPadding, 1, \ 1490 "The multiple of deviation from mean to use for buffering " \ 1491 "against volatility in inter-sweep duration.") \ 1492 \ 1493 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1494 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1495 "duration exceeds this threhold in milliseconds") \ 1496 \ 1497 develop(bool, CMSTraceIncrementalMode, false, \ 1498 "Trace CMS incremental mode") \ 1499 \ 1500 develop(bool, CMSTraceIncrementalPacing, false, \ 1501 "Trace CMS incremental mode pacing computation") \ 1502 \ 1503 develop(bool, CMSTraceThreadState, false, \ 1504 "Trace the CMS thread state (enable the trace_state() method)") \ 1505 \ 1506 product(bool, CMSClassUnloadingEnabled, false, \ 1507 "Whether class unloading enabled when using CMS GC") \ 1508 \ 1509 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1510 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1511 " for which classes may not be unloaded") \ 1512 \ 1513 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1514 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1515 \ 1516 product(bool, UseCMSCompactAtFullCollection, true, \ 1517 "Use mark sweep compact at full collections") \ 1518 \ 1519 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1520 "Number of CMS full collection done before compaction if > 0") \ 1521 \ 1522 develop(intx, CMSDictionaryChoice, 0, \ 1523 "Use BinaryTreeDictionary as default in the CMS generation") \ 1524 \ 1525 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1526 "Replenish and indexed free list with this number of chunks") \ 1527 \ 1528 product(bool, CMSReplenishIntermediate, true, \ 1529 "Replenish all intermediate free-list caches") \ 1530 \ 1531 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1532 "When satisfying batched demand, splot blocks from the " \ 1533 "IndexedFreeList whose size is a multiple of requested size") \ 1534 \ 1535 product(bool, CMSLoopWarn, false, \ 1536 "Warn in case of excessive CMS looping") \ 1537 \ 1538 develop(bool, CMSOverflowEarlyRestoration, false, \ 1539 "Whether preserved marks should be restored early") \ 1540 \ 1541 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1542 "Size of marking stack") \ 1543 \ 1544 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1545 "Max size of marking stack") \ 1546 \ 1547 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1548 "Whether we should simulate frequent marking stack / work queue" \ 1549 " overflow") \ 1550 \ 1551 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1552 "An `interval' counter that determines how frequently" \ 1553 " we simulate overflow; a smaller number increases frequency") \ 1554 \ 1555 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1556 "(Temporary, subject to experimentation)" \ 1557 "Maximum number of abortable preclean iterations, if > 0") \ 1558 \ 1559 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1560 "(Temporary, subject to experimentation)" \ 1561 "Maximum time in abortable preclean in ms") \ 1562 \ 1563 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1564 "(Temporary, subject to experimentation)" \ 1565 "Nominal minimum work per abortable preclean iteration") \ 1566 \ 1567 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1568 "(Temporary, subject to experimentation)" \ 1569 " Time that we sleep between iterations when not given" \ 1570 " enough work per iteration") \ 1571 \ 1572 product(uintx, CMSRescanMultiple, 32, \ 1573 "Size (in cards) of CMS parallel rescan task") \ 1574 \ 1575 product(uintx, CMSConcMarkMultiple, 32, \ 1576 "Size (in cards) of CMS concurrent MT marking task") \ 1577 \ 1578 product(uintx, CMSRevisitStackSize, 1*M, \ 1579 "Size of CMS KlassKlass revisit stack") \ 1580 \ 1581 product(bool, CMSAbortSemantics, false, \ 1582 "Whether abort-on-overflow semantics is implemented") \ 1583 \ 1584 product(bool, CMSParallelRemarkEnabled, true, \ 1585 "Whether parallel remark enabled (only if ParNewGC)") \ 1586 \ 1587 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1588 "Whether parallel remark of survivor space" \ 1589 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1590 \ 1591 product(bool, CMSPLABRecordAlways, true, \ 1592 "Whether to always record survivor space PLAB bdries" \ 1593 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1594 \ 1595 product(bool, CMSConcurrentMTEnabled, true, \ 1596 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1597 \ 1598 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1599 "Whether concurrent precleaning enabled in perm gen" \ 1600 " (effective only when CMSPrecleaningEnabled is true)") \ 1601 \ 1602 product(bool, CMSPrecleaningEnabled, true, \ 1603 "Whether concurrent precleaning enabled") \ 1604 \ 1605 product(uintx, CMSPrecleanIter, 3, \ 1606 "Maximum number of precleaning iteration passes") \ 1607 \ 1608 product(uintx, CMSPrecleanNumerator, 2, \ 1609 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1610 " ratio") \ 1611 \ 1612 product(uintx, CMSPrecleanDenominator, 3, \ 1613 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1614 " ratio") \ 1615 \ 1616 product(bool, CMSPrecleanRefLists1, true, \ 1617 "Preclean ref lists during (initial) preclean phase") \ 1618 \ 1619 product(bool, CMSPrecleanRefLists2, false, \ 1620 "Preclean ref lists during abortable preclean phase") \ 1621 \ 1622 product(bool, CMSPrecleanSurvivors1, false, \ 1623 "Preclean survivors during (initial) preclean phase") \ 1624 \ 1625 product(bool, CMSPrecleanSurvivors2, true, \ 1626 "Preclean survivors during abortable preclean phase") \ 1627 \ 1628 product(uintx, CMSPrecleanThreshold, 1000, \ 1629 "Don't re-iterate if #dirty cards less than this") \ 1630 \ 1631 product(bool, CMSCleanOnEnter, true, \ 1632 "Clean-on-enter optimization for reducing number of dirty cards") \ 1633 \ 1634 product(uintx, CMSRemarkVerifyVariant, 1, \ 1635 "Choose variant (1,2) of verification following remark") \ 1636 \ 1637 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1638 "If Eden used is below this value, don't try to schedule remark") \ 1639 \ 1640 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1641 "The Eden occupancy % at which to try and schedule remark pause") \ 1642 \ 1643 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1644 "Start sampling Eden top at least before yg occupancy reaches" \ 1645 " 1/<ratio> of the size at which we plan to schedule remark") \ 1646 \ 1647 product(uintx, CMSSamplingGrain, 16*K, \ 1648 "The minimum distance between eden samples for CMS (see above)") \ 1649 \ 1650 product(bool, CMSScavengeBeforeRemark, false, \ 1651 "Attempt scavenge before the CMS remark step") \ 1652 \ 1653 develop(bool, CMSTraceSweeper, false, \ 1654 "Trace some actions of the CMS sweeper") \ 1655 \ 1656 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1657 "Don't drain below this size per parallel worker/thief") \ 1658 \ 1659 product(intx, CMSWaitDuration, 2000, \ 1660 "Time in milliseconds that CMS thread waits for young GC") \ 1661 \ 1662 product(bool, CMSYield, true, \ 1663 "Yield between steps of concurrent mark & sweep") \ 1664 \ 1665 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1666 "Bitmap operations should process at most this many bits" \ 1667 "between yields") \ 1668 \ 1669 product(bool, CMSDumpAtPromotionFailure, false, \ 1670 "Dump useful information about the state of the CMS old " \ 1671 " generation upon a promotion failure.") \ 1672 \ 1673 product(bool, CMSPrintChunksInDump, false, \ 1674 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1675 " more detailed information about the free chunks.") \ 1676 \ 1677 product(bool, CMSPrintObjectsInDump, false, \ 1678 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1679 " more detailed information about the allocated objects.") \ 1680 \ 1681 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1682 "Verify that all refs across the FLS boundary " \ 1683 " are to valid objects") \ 1684 \ 1685 diagnostic(bool, FLSVerifyLists, false, \ 1686 "Do lots of (expensive) FreeListSpace verification") \ 1687 \ 1688 diagnostic(bool, FLSVerifyIndexTable, false, \ 1689 "Do lots of (expensive) FLS index table verification") \ 1690 \ 1691 develop(bool, FLSVerifyDictionary, false, \ 1692 "Do lots of (expensive) FLS dictionary verification") \ 1693 \ 1694 develop(bool, VerifyBlockOffsetArray, false, \ 1695 "Do (expensive!) block offset array verification") \ 1696 \ 1697 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1698 "Maintain _unallocated_block in BlockOffsetArray" \ 1699 " (currently applicable only to CMS collector)") \ 1700 \ 1701 develop(bool, TraceCMSState, false, \ 1702 "Trace the state of the CMS collection") \ 1703 \ 1704 product(intx, RefDiscoveryPolicy, 0, \ 1705 "Whether reference-based(0) or referent-based(1)") \ 1706 \ 1707 product(bool, ParallelRefProcEnabled, false, \ 1708 "Enable parallel reference processing whenever possible") \ 1709 \ 1710 product(bool, ParallelRefProcBalancingEnabled, true, \ 1711 "Enable balancing of reference processing queues") \ 1712 \ 1713 product(intx, CMSTriggerRatio, 80, \ 1714 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1715 "allocated before a CMS collection cycle commences") \ 1716 \ 1717 product(intx, CMSTriggerPermRatio, 80, \ 1718 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1719 "is allocated before a CMS collection cycle commences, that " \ 1720 "also collects the perm generation") \ 1721 \ 1722 product(uintx, CMSBootstrapOccupancy, 50, \ 1723 "Percentage CMS generation occupancy at which to " \ 1724 "initiate CMS collection for bootstrapping collection stats") \ 1725 \ 1726 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1727 "Percentage CMS generation occupancy to start a CMS collection " \ 1728 "cycle. A negative value means that CMSTriggerRatio is used") \ 1729 \ 1730 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1731 "Percentage of the (entire) heap occupancy to start a " \ 1732 "concurrent GC cycle. It us used by GCs that trigger a " \ 1733 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1734 "not just one of the generations (e.g., G1). A value of 0 " \ 1735 "denotes 'do constant GC cycles'.") \ 1736 \ 1737 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1738 "Percentage CMS perm generation occupancy to start a " \ 1739 "CMScollection cycle. A negative value means that " \ 1740 "CMSTriggerPermRatio is used") \ 1741 \ 1742 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1743 "Only use occupancy as a crierion for starting a CMS collection") \ 1744 \ 1745 product(intx, CMSIsTooFullPercentage, 98, \ 1746 "An absolute ceiling above which CMS will always consider the " \ 1747 "perm gen ripe for collection") \ 1748 \ 1749 develop(bool, CMSTestInFreeList, false, \ 1750 "Check if the coalesced range is already in the " \ 1751 "free lists as claimed") \ 1752 \ 1753 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1754 "Check that all the garbage collected was returned to the " \ 1755 "free lists.") \ 1756 \ 1757 notproduct(bool, ScavengeALot, false, \ 1758 "Force scavenge at every Nth exit from the runtime system " \ 1759 "(N=ScavengeALotInterval)") \ 1760 \ 1761 develop(bool, FullGCALot, false, \ 1762 "Force full gc at every Nth exit from the runtime system " \ 1763 "(N=FullGCALotInterval)") \ 1764 \ 1765 notproduct(bool, GCALotAtAllSafepoints, false, \ 1766 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1767 \ 1768 product(bool, HandlePromotionFailure, true, \ 1769 "The youngest generation collection does not require " \ 1770 "a guarantee of full promotion of all live objects.") \ 1771 \ 1772 product(bool, PrintPromotionFailure, false, \ 1773 "Print additional diagnostic information following " \ 1774 " promotion failure") \ 1775 \ 1776 notproduct(bool, PromotionFailureALot, false, \ 1777 "Use promotion failure handling on every youngest generation " \ 1778 "collection") \ 1779 \ 1780 develop(uintx, PromotionFailureALotCount, 1000, \ 1781 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1782 "refill attempts (ParNew) or promotion attempts " \ 1783 "(other young collectors) ") \ 1784 \ 1785 develop(uintx, PromotionFailureALotInterval, 5, \ 1786 "Total collections between promotion failures alot") \ 1787 \ 1788 develop(intx, WorkStealingSleepMillis, 1, \ 1789 "Sleep time when sleep is used for yields") \ 1790 \ 1791 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1792 "Number of yields before a sleep is done during workstealing") \ 1793 \ 1794 develop(uintx, WorkStealingHardSpins, 4096, \ 1795 "Number of iterations in a spin loop between checks on " \ 1796 "time out of hard spin") \ 1797 \ 1798 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1799 "Ratio of hard spins to calls to yield") \ 1800 \ 1801 product(uintx, PreserveMarkStackSize, 1024, \ 1802 "Size for stack used in promotion failure handling") \ 1803 \ 1804 develop(uintx, ObjArrayMarkingStride, 512, \ 1805 "Number of ObjArray elements to push onto the marking stack" \ 1806 "before pushing a continuation entry") \ 1807 \ 1808 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1809 \ 1810 product_pd(bool, ResizeTLAB, \ 1811 "Dynamically resize tlab size for threads") \ 1812 \ 1813 product(bool, ZeroTLAB, false, \ 1814 "Zero out the newly created TLAB") \ 1815 \ 1816 product(bool, FastTLABRefill, true, \ 1817 "Use fast TLAB refill code") \ 1818 \ 1819 product(bool, PrintTLAB, false, \ 1820 "Print various TLAB related information") \ 1821 \ 1822 product(bool, TLABStats, true, \ 1823 "Print various TLAB related information") \ 1824 \ 1825 product(bool, PrintRevisitStats, false, \ 1826 "Print revisit (klass and MDO) stack related information") \ 1827 \ 1828 product_pd(bool, NeverActAsServerClassMachine, \ 1829 "Never act like a server-class machine") \ 1830 \ 1831 product(bool, AlwaysActAsServerClassMachine, false, \ 1832 "Always act like a server-class machine") \ 1833 \ 1834 product_pd(uint64_t, MaxRAM, \ 1835 "Real memory size (in bytes) used to set maximum heap size") \ 1836 \ 1837 product(uintx, ErgoHeapSizeLimit, 0, \ 1838 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1839 "MaxRAM / MaxRAMFraction") \ 1840 \ 1841 product(uintx, MaxRAMFraction, 4, \ 1842 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1843 "size") \ 1844 \ 1845 product(uintx, DefaultMaxRAMFraction, 4, \ 1846 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1847 "size; deprecated: to be renamed to MaxRAMFraction") \ 1848 \ 1849 product(uintx, MinRAMFraction, 2, \ 1850 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1851 "size on systems with small physical memory size") \ 1852 \ 1853 product(uintx, InitialRAMFraction, 64, \ 1854 "Fraction (1/n) of real memory used for initial heap size") \ 1855 \ 1856 product(bool, UseAutoGCSelectPolicy, false, \ 1857 "Use automatic collection selection policy") \ 1858 \ 1859 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1860 "Automatic GC selection pause threshhold in ms") \ 1861 \ 1862 product(bool, UseAdaptiveSizePolicy, true, \ 1863 "Use adaptive generation sizing policies") \ 1864 \ 1865 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1866 "Use adaptive survivor sizing policies") \ 1867 \ 1868 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1869 "Use adaptive young-old sizing policies at minor collections") \ 1870 \ 1871 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1872 "Use adaptive young-old sizing policies at major collections") \ 1873 \ 1874 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1875 "Use statistics from System.GC for adaptive size policy") \ 1876 \ 1877 product(bool, UseAdaptiveGCBoundary, false, \ 1878 "Allow young-old boundary to move") \ 1879 \ 1880 develop(bool, TraceAdaptiveGCBoundary, false, \ 1881 "Trace young-old boundary moves") \ 1882 \ 1883 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1884 "Resize the virtual spaces of the young or old generations") \ 1885 \ 1886 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1887 "Policy for changeing generation size for throughput goals") \ 1888 \ 1889 product(uintx, AdaptiveSizePausePolicy, 0, \ 1890 "Policy for changing generation size for pause goals") \ 1891 \ 1892 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1893 "Adjust tenured generation to achive a minor pause goal") \ 1894 \ 1895 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1896 "Adjust young generation to achive a major pause goal") \ 1897 \ 1898 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1899 "Number of steps where heuristics is used before data is used") \ 1900 \ 1901 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1902 "Number of collections before the adaptive sizing is started") \ 1903 \ 1904 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1905 "Collecton interval for printing information; zero => never") \ 1906 \ 1907 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1908 "Use adaptive minimum footprint as a goal") \ 1909 \ 1910 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1911 "Weight given to exponential resizing, between 0 and 100") \ 1912 \ 1913 product(uintx, AdaptiveTimeWeight, 25, \ 1914 "Weight given to time in adaptive policy, between 0 and 100") \ 1915 \ 1916 product(uintx, PausePadding, 1, \ 1917 "How much buffer to keep for pause time") \ 1918 \ 1919 product(uintx, PromotedPadding, 3, \ 1920 "How much buffer to keep for promotion failure") \ 1921 \ 1922 product(uintx, SurvivorPadding, 3, \ 1923 "How much buffer to keep for survivor overflow") \ 1924 \ 1925 product(uintx, AdaptivePermSizeWeight, 20, \ 1926 "Weight for perm gen exponential resizing, between 0 and 100") \ 1927 \ 1928 product(uintx, PermGenPadding, 3, \ 1929 "How much buffer to keep for perm gen sizing") \ 1930 \ 1931 product(uintx, ThresholdTolerance, 10, \ 1932 "Allowed collection cost difference between generations") \ 1933 \ 1934 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1935 "If collection costs are within margin, reduce both by full " \ 1936 "delta") \ 1937 \ 1938 product(uintx, YoungGenerationSizeIncrement, 20, \ 1939 "Adaptive size percentage change in young generation") \ 1940 \ 1941 product(uintx, YoungGenerationSizeSupplement, 80, \ 1942 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1943 \ 1944 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1945 "Decay factor to YoungedGenerationSizeSupplement") \ 1946 \ 1947 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1948 "Adaptive size percentage change in tenured generation") \ 1949 \ 1950 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1951 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1952 \ 1953 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1954 "Decay factor to TenuredGenerationSizeIncrement") \ 1955 \ 1956 product(uintx, MaxGCPauseMillis, max_uintx, \ 1957 "Adaptive size policy maximum GC pause time goal in msec, " \ 1958 "or (G1 Only) the max. GC time per MMU time slice") \ 1959 \ 1960 product(intx, GCPauseIntervalMillis, 500, \ 1961 "Time slice for MMU specification") \ 1962 \ 1963 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1964 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1965 \ 1966 product(uintx, GCTimeRatio, 99, \ 1967 "Adaptive size policy application time to GC time ratio") \ 1968 \ 1969 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1970 "Adaptive size scale down factor for shrinking") \ 1971 \ 1972 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1973 "Adaptive size decays the major cost for long major intervals") \ 1974 \ 1975 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1976 "Time scale over which major costs decay") \ 1977 \ 1978 product(uintx, MinSurvivorRatio, 3, \ 1979 "Minimum ratio of young generation/survivor space size") \ 1980 \ 1981 product(uintx, InitialSurvivorRatio, 8, \ 1982 "Initial ratio of eden/survivor space size") \ 1983 \ 1984 product(uintx, BaseFootPrintEstimate, 256*M, \ 1985 "Estimate of footprint other than Java Heap") \ 1986 \ 1987 product(bool, UseGCOverheadLimit, true, \ 1988 "Use policy to limit of proportion of time spent in GC " \ 1989 "before an OutOfMemory error is thrown") \ 1990 \ 1991 product(uintx, GCTimeLimit, 98, \ 1992 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1993 "error is thrown (used with GCHeapFreeLimit)") \ 1994 \ 1995 product(uintx, GCHeapFreeLimit, 2, \ 1996 "Minimum percentage of free space after a full GC before an " \ 1997 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1998 \ 1999 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2000 "Number of consecutive collections before gc time limit fires") \ 2001 \ 2002 product(bool, PrintAdaptiveSizePolicy, false, \ 2003 "Print information about AdaptiveSizePolicy") \ 2004 \ 2005 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2006 "How far ahead to prefetch destination area (<= 0 means off)") \ 2007 \ 2008 product(intx, PrefetchScanIntervalInBytes, -1, \ 2009 "How far ahead to prefetch scan area (<= 0 means off)") \ 2010 \ 2011 product(intx, PrefetchFieldsAhead, -1, \ 2012 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2013 \ 2014 develop(bool, UsePrefetchQueue, true, \ 2015 "Use the prefetch queue during PS promotion") \ 2016 \ 2017 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2018 "Verify system before exiting") \ 2019 \ 2020 diagnostic(bool, VerifyBeforeGC, false, \ 2021 "Verify memory system before GC") \ 2022 \ 2023 diagnostic(bool, VerifyAfterGC, false, \ 2024 "Verify memory system after GC") \ 2025 \ 2026 diagnostic(bool, VerifyDuringGC, false, \ 2027 "Verify memory system during GC (between phases)") \ 2028 \ 2029 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2030 "Enable parallel memory system verification") \ 2031 \ 2032 diagnostic(bool, DeferInitialCardMark, false, \ 2033 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2034 "may arise from new_pre_store_barrier") \ 2035 \ 2036 diagnostic(bool, VerifyRememberedSets, false, \ 2037 "Verify GC remembered sets") \ 2038 \ 2039 diagnostic(bool, VerifyObjectStartArray, true, \ 2040 "Verify GC object start array if verify before/after") \ 2041 \ 2042 product(bool, DisableExplicitGC, false, \ 2043 "Tells whether calling System.gc() does a full GC") \ 2044 \ 2045 notproduct(bool, CheckMemoryInitialization, false, \ 2046 "Checks memory initialization") \ 2047 \ 2048 product(bool, CollectGen0First, false, \ 2049 "Collect youngest generation before each full GC") \ 2050 \ 2051 diagnostic(bool, BindCMSThreadToCPU, false, \ 2052 "Bind CMS Thread to CPU if possible") \ 2053 \ 2054 diagnostic(uintx, CPUForCMSThread, 0, \ 2055 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2056 \ 2057 product(bool, BindGCTaskThreadsToCPUs, false, \ 2058 "Bind GCTaskThreads to CPUs if possible") \ 2059 \ 2060 product(bool, UseGCTaskAffinity, false, \ 2061 "Use worker affinity when asking for GCTasks") \ 2062 \ 2063 product(uintx, ProcessDistributionStride, 4, \ 2064 "Stride through processors when distributing processes") \ 2065 \ 2066 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2067 "number of times the coordinator GC thread will sleep while " \ 2068 "yielding before giving up and resuming GC") \ 2069 \ 2070 product(uintx, CMSYieldSleepCount, 0, \ 2071 "number of times a GC thread (minus the coordinator) " \ 2072 "will sleep while yielding before giving up and resuming GC") \ 2073 \ 2074 /* gc tracing */ \ 2075 manageable(bool, PrintGC, false, \ 2076 "Print message at garbage collect") \ 2077 \ 2078 manageable(bool, PrintGCDetails, false, \ 2079 "Print more details at garbage collect") \ 2080 \ 2081 manageable(bool, PrintGCDateStamps, false, \ 2082 "Print date stamps at garbage collect") \ 2083 \ 2084 manageable(bool, PrintGCTimeStamps, false, \ 2085 "Print timestamps at garbage collect") \ 2086 \ 2087 product(bool, PrintGCTaskTimeStamps, false, \ 2088 "Print timestamps for individual gc worker thread tasks") \ 2089 \ 2090 develop(intx, ConcGCYieldTimeout, 0, \ 2091 "If non-zero, assert that GC threads yield within this # of ms.") \ 2092 \ 2093 notproduct(bool, TraceMarkSweep, false, \ 2094 "Trace mark sweep") \ 2095 \ 2096 product(bool, PrintReferenceGC, false, \ 2097 "Print times spent handling reference objects during GC " \ 2098 " (enabled only when PrintGCDetails)") \ 2099 \ 2100 develop(bool, TraceReferenceGC, false, \ 2101 "Trace handling of soft/weak/final/phantom references") \ 2102 \ 2103 develop(bool, TraceFinalizerRegistration, false, \ 2104 "Trace registration of final references") \ 2105 \ 2106 notproduct(bool, TraceScavenge, false, \ 2107 "Trace scavenge") \ 2108 \ 2109 product_rw(bool, TraceClassLoading, false, \ 2110 "Trace all classes loaded") \ 2111 \ 2112 product(bool, TraceClassLoadingPreorder, false, \ 2113 "Trace all classes loaded in order referenced (not loaded)") \ 2114 \ 2115 product_rw(bool, TraceClassUnloading, false, \ 2116 "Trace unloading of classes") \ 2117 \ 2118 product_rw(bool, TraceLoaderConstraints, false, \ 2119 "Trace loader constraints") \ 2120 \ 2121 product(bool, TraceGen0Time, false, \ 2122 "Trace accumulated time for Gen 0 collection") \ 2123 \ 2124 product(bool, TraceGen1Time, false, \ 2125 "Trace accumulated time for Gen 1 collection") \ 2126 \ 2127 product(bool, PrintTenuringDistribution, false, \ 2128 "Print tenuring age information") \ 2129 \ 2130 product_rw(bool, PrintHeapAtGC, false, \ 2131 "Print heap layout before and after each GC") \ 2132 \ 2133 product_rw(bool, PrintHeapAtGCExtended, false, \ 2134 "Prints extended information about the layout of the heap " \ 2135 "when -XX:+PrintHeapAtGC is set") \ 2136 \ 2137 product(bool, PrintHeapAtSIGBREAK, true, \ 2138 "Print heap layout in response to SIGBREAK") \ 2139 \ 2140 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2141 "Print a class histogram before any major stop-world GC") \ 2142 \ 2143 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2144 "Print a class histogram after any major stop-world GC") \ 2145 \ 2146 manageable(bool, PrintClassHistogram, false, \ 2147 "Print a histogram of class instances") \ 2148 \ 2149 develop(bool, TraceWorkGang, false, \ 2150 "Trace activities of work gangs") \ 2151 \ 2152 product(bool, TraceParallelOldGCTasks, false, \ 2153 "Trace multithreaded GC activity") \ 2154 \ 2155 develop(bool, TraceBlockOffsetTable, false, \ 2156 "Print BlockOffsetTable maps") \ 2157 \ 2158 develop(bool, TraceCardTableModRefBS, false, \ 2159 "Print CardTableModRefBS maps") \ 2160 \ 2161 develop(bool, TraceGCTaskManager, false, \ 2162 "Trace actions of the GC task manager") \ 2163 \ 2164 develop(bool, TraceGCTaskQueue, false, \ 2165 "Trace actions of the GC task queues") \ 2166 \ 2167 develop(bool, TraceGCTaskThread, false, \ 2168 "Trace actions of the GC task threads") \ 2169 \ 2170 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2171 "Print the time taken by each parallel old gc phase." \ 2172 "PrintGCDetails must also be enabled.") \ 2173 \ 2174 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2175 "Trace parallel old gc marking phase") \ 2176 \ 2177 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2178 "Trace parallel old gc summary phase") \ 2179 \ 2180 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2181 "Trace parallel old gc compaction phase") \ 2182 \ 2183 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2184 "Trace parallel old gc dense prefix computation") \ 2185 \ 2186 develop(bool, IgnoreLibthreadGPFault, false, \ 2187 "Suppress workaround for libthread GP fault") \ 2188 \ 2189 product(bool, PrintJNIGCStalls, false, \ 2190 "Print diagnostic message when GC is stalled" \ 2191 "by JNI critical section") \ 2192 \ 2193 /* JVMTI heap profiling */ \ 2194 \ 2195 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2196 "Trace JVMTI object tagging calls") \ 2197 \ 2198 diagnostic(bool, VerifyBeforeIteration, false, \ 2199 "Verify memory system before JVMTI iteration") \ 2200 \ 2201 /* compiler interface */ \ 2202 \ 2203 develop(bool, CIPrintCompilerName, false, \ 2204 "when CIPrint is active, print the name of the active compiler") \ 2205 \ 2206 develop(bool, CIPrintCompileQueue, false, \ 2207 "display the contents of the compile queue whenever a " \ 2208 "compilation is enqueued") \ 2209 \ 2210 develop(bool, CIPrintRequests, false, \ 2211 "display every request for compilation") \ 2212 \ 2213 product(bool, CITime, false, \ 2214 "collect timing information for compilation") \ 2215 \ 2216 develop(bool, CITimeEach, false, \ 2217 "display timing information after each successful compilation") \ 2218 \ 2219 develop(bool, CICountOSR, true, \ 2220 "use a separate counter when assigning ids to osr compilations") \ 2221 \ 2222 develop(bool, CICompileNatives, true, \ 2223 "compile native methods if supported by the compiler") \ 2224 \ 2225 develop_pd(bool, CICompileOSR, \ 2226 "compile on stack replacement methods if supported by the " \ 2227 "compiler") \ 2228 \ 2229 develop(bool, CIPrintMethodCodes, false, \ 2230 "print method bytecodes of the compiled code") \ 2231 \ 2232 develop(bool, CIPrintTypeFlow, false, \ 2233 "print the results of ciTypeFlow analysis") \ 2234 \ 2235 develop(bool, CITraceTypeFlow, false, \ 2236 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2237 \ 2238 develop(intx, CICloneLoopTestLimit, 100, \ 2239 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2240 \ 2241 /* temp diagnostics */ \ 2242 \ 2243 diagnostic(bool, TraceRedundantCompiles, false, \ 2244 "Have compile broker print when a request already in the queue is"\ 2245 " requested again") \ 2246 \ 2247 diagnostic(bool, InitialCompileFast, false, \ 2248 "Initial compile at CompLevel_fast_compile") \ 2249 \ 2250 diagnostic(bool, InitialCompileReallyFast, false, \ 2251 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2252 \ 2253 diagnostic(bool, FullProfileOnReInterpret, true, \ 2254 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2255 \ 2256 /* compiler */ \ 2257 \ 2258 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2259 "Number of compiler threads to run") \ 2260 \ 2261 product(intx, CompilationPolicyChoice, 0, \ 2262 "which compilation policy (0/1)") \ 2263 \ 2264 develop(bool, UseStackBanging, true, \ 2265 "use stack banging for stack overflow checks (required for " \ 2266 "proper StackOverflow handling; disable only to measure cost " \ 2267 "of stackbanging)") \ 2268 \ 2269 develop(bool, Use24BitFPMode, true, \ 2270 "Set 24-bit FPU mode on a per-compile basis ") \ 2271 \ 2272 develop(bool, Use24BitFP, true, \ 2273 "use FP instructions that produce 24-bit precise results") \ 2274 \ 2275 develop(bool, UseStrictFP, true, \ 2276 "use strict fp if modifier strictfp is set") \ 2277 \ 2278 develop(bool, GenerateSynchronizationCode, true, \ 2279 "generate locking/unlocking code for synchronized methods and " \ 2280 "monitors") \ 2281 \ 2282 develop(bool, GenerateCompilerNullChecks, true, \ 2283 "Generate explicit null checks for loads/stores/calls") \ 2284 \ 2285 develop(bool, GenerateRangeChecks, true, \ 2286 "Generate range checks for array accesses") \ 2287 \ 2288 develop_pd(bool, ImplicitNullChecks, \ 2289 "generate code for implicit null checks") \ 2290 \ 2291 product(bool, PrintSafepointStatistics, false, \ 2292 "print statistics about safepoint synchronization") \ 2293 \ 2294 product(intx, PrintSafepointStatisticsCount, 300, \ 2295 "total number of safepoint statistics collected " \ 2296 "before printing them out") \ 2297 \ 2298 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2299 "print safepoint statistics only when safepoint takes" \ 2300 " more than PrintSafepointSatisticsTimeout in millis") \ 2301 \ 2302 product(bool, TraceSafepointCleanupTime, false, \ 2303 "print the break down of clean up tasks performed during" \ 2304 " safepoint") \ 2305 \ 2306 develop(bool, InlineAccessors, true, \ 2307 "inline accessor methods (get/set)") \ 2308 \ 2309 product(bool, Inline, true, \ 2310 "enable inlining") \ 2311 \ 2312 product(bool, ClipInlining, true, \ 2313 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2314 \ 2315 develop(bool, UseCHA, true, \ 2316 "enable CHA") \ 2317 \ 2318 product(bool, UseTypeProfile, true, \ 2319 "Check interpreter profile for historically monomorphic calls") \ 2320 \ 2321 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2322 "% of major receiver type to all profiled receivers") \ 2323 \ 2324 notproduct(bool, TimeCompiler, false, \ 2325 "time the compiler") \ 2326 \ 2327 notproduct(bool, TimeCompiler2, false, \ 2328 "detailed time the compiler (requires +TimeCompiler)") \ 2329 \ 2330 diagnostic(bool, PrintInlining, false, \ 2331 "prints inlining optimizations") \ 2332 \ 2333 diagnostic(bool, PrintIntrinsics, false, \ 2334 "prints attempted and successful inlining of intrinsics") \ 2335 \ 2336 product(bool, UseCountLeadingZerosInstruction, false, \ 2337 "Use count leading zeros instruction") \ 2338 \ 2339 product(bool, UsePopCountInstruction, false, \ 2340 "Use population count instruction") \ 2341 \ 2342 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2343 "do not expand intrinsics whose (internal) names appear here") \ 2344 \ 2345 develop(bool, StressReflectiveCode, false, \ 2346 "Use inexact types at allocations, etc., to test reflection") \ 2347 \ 2348 develop(bool, EagerInitialization, false, \ 2349 "Eagerly initialize classes if possible") \ 2350 \ 2351 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2352 "Update methodDataOops in Tier1-generated code") \ 2353 \ 2354 develop(bool, TraceMethodReplacement, false, \ 2355 "Print when methods are replaced do to recompilation") \ 2356 \ 2357 develop(bool, PrintMethodFlushing, false, \ 2358 "print the nmethods being flushed") \ 2359 \ 2360 notproduct(bool, LogMultipleMutexLocking, false, \ 2361 "log locking and unlocking of mutexes (only if multiple locks " \ 2362 "are held)") \ 2363 \ 2364 develop(bool, UseRelocIndex, false, \ 2365 "use an index to speed random access to relocations") \ 2366 \ 2367 develop(bool, StressCodeBuffers, false, \ 2368 "Exercise code buffer expansion and other rare state changes") \ 2369 \ 2370 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2371 "Generate extra debugging info for non-safepoints in nmethods") \ 2372 \ 2373 diagnostic(bool, DebugInlinedCalls, true, \ 2374 "If false, restricts profiled locations to the root method only") \ 2375 \ 2376 product(bool, PrintVMOptions, trueInDebug, \ 2377 "Print flags that appeared on the command line") \ 2378 \ 2379 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2380 "Ignore unrecognized VM options") \ 2381 \ 2382 product(bool, PrintCommandLineFlags, false, \ 2383 "Print flags specified on command line or set by ergonomics") \ 2384 \ 2385 product(bool, PrintFlagsInitial, false, \ 2386 "Print all VM flags before argument processing and exit VM") \ 2387 \ 2388 product(bool, PrintFlagsFinal, false, \ 2389 "Print all VM flags after argument and ergonomic processing") \ 2390 \ 2391 diagnostic(bool, SerializeVMOutput, true, \ 2392 "Use a mutex to serialize output to tty and hotspot.log") \ 2393 \ 2394 diagnostic(bool, DisplayVMOutput, true, \ 2395 "Display all VM output on the tty, independently of LogVMOutput") \ 2396 \ 2397 diagnostic(bool, LogVMOutput, trueInDebug, \ 2398 "Save VM output to hotspot.log, or to LogFile") \ 2399 \ 2400 diagnostic(ccstr, LogFile, NULL, \ 2401 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2402 \ 2403 product(ccstr, ErrorFile, NULL, \ 2404 "If an error occurs, save the error data to this file " \ 2405 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2406 \ 2407 product(bool, DisplayVMOutputToStderr, false, \ 2408 "If DisplayVMOutput is true, display all VM output to stderr") \ 2409 \ 2410 product(bool, DisplayVMOutputToStdout, false, \ 2411 "If DisplayVMOutput is true, display all VM output to stdout") \ 2412 \ 2413 product(bool, UseHeavyMonitors, false, \ 2414 "use heavyweight instead of lightweight Java monitors") \ 2415 \ 2416 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2417 "print histogram of the symbol table") \ 2418 \ 2419 notproduct(bool, ExitVMOnVerifyError, false, \ 2420 "standard exit from VM if bytecode verify error " \ 2421 "(only in debug mode)") \ 2422 \ 2423 notproduct(ccstr, AbortVMOnException, NULL, \ 2424 "Call fatal if this exception is thrown. Example: " \ 2425 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2426 \ 2427 develop(bool, DebugVtables, false, \ 2428 "add debugging code to vtable dispatch") \ 2429 \ 2430 develop(bool, PrintVtables, false, \ 2431 "print vtables when printing klass") \ 2432 \ 2433 notproduct(bool, PrintVtableStats, false, \ 2434 "print vtables stats at end of run") \ 2435 \ 2436 develop(bool, TraceCreateZombies, false, \ 2437 "trace creation of zombie nmethods") \ 2438 \ 2439 notproduct(bool, IgnoreLockingAssertions, false, \ 2440 "disable locking assertions (for speed)") \ 2441 \ 2442 notproduct(bool, VerifyLoopOptimizations, false, \ 2443 "verify major loop optimizations") \ 2444 \ 2445 product(bool, RangeCheckElimination, true, \ 2446 "Split loop iterations to eliminate range checks") \ 2447 \ 2448 develop_pd(bool, UncommonNullCast, \ 2449 "track occurrences of null in casts; adjust compiler tactics") \ 2450 \ 2451 develop(bool, TypeProfileCasts, true, \ 2452 "treat casts like calls for purposes of type profiling") \ 2453 \ 2454 develop(bool, MonomorphicArrayCheck, true, \ 2455 "Uncommon-trap array store checks that require full type check") \ 2456 \ 2457 develop(bool, DelayCompilationDuringStartup, true, \ 2458 "Delay invoking the compiler until main application class is " \ 2459 "loaded") \ 2460 \ 2461 develop(bool, CompileTheWorld, false, \ 2462 "Compile all methods in all classes in bootstrap class path " \ 2463 "(stress test)") \ 2464 \ 2465 develop(bool, CompileTheWorldPreloadClasses, true, \ 2466 "Preload all classes used by a class before start loading") \ 2467 \ 2468 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2469 "Compile all methods although class initializer failed") \ 2470 \ 2471 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2472 "Force a safepoint every n compiles so sweeper can keep up") \ 2473 \ 2474 develop(bool, TraceIterativeGVN, false, \ 2475 "Print progress during Iterative Global Value Numbering") \ 2476 \ 2477 develop(bool, FillDelaySlots, true, \ 2478 "Fill delay slots (on SPARC only)") \ 2479 \ 2480 develop(bool, VerifyIterativeGVN, false, \ 2481 "Verify Def-Use modifications during sparse Iterative Global " \ 2482 "Value Numbering") \ 2483 \ 2484 notproduct(bool, TracePhaseCCP, false, \ 2485 "Print progress during Conditional Constant Propagation") \ 2486 \ 2487 develop(bool, TimeLivenessAnalysis, false, \ 2488 "Time computation of bytecode liveness analysis") \ 2489 \ 2490 develop(bool, TraceLivenessGen, false, \ 2491 "Trace the generation of liveness analysis information") \ 2492 \ 2493 notproduct(bool, TraceLivenessQuery, false, \ 2494 "Trace queries of liveness analysis information") \ 2495 \ 2496 notproduct(bool, CollectIndexSetStatistics, false, \ 2497 "Collect information about IndexSets") \ 2498 \ 2499 develop(bool, PrintDominators, false, \ 2500 "Print out dominator trees for GVN") \ 2501 \ 2502 develop(bool, UseLoopSafepoints, true, \ 2503 "Generate Safepoint nodes in every loop") \ 2504 \ 2505 notproduct(bool, TraceCISCSpill, false, \ 2506 "Trace allocators use of cisc spillable instructions") \ 2507 \ 2508 notproduct(bool, TraceSpilling, false, \ 2509 "Trace spilling") \ 2510 \ 2511 product(bool, SplitIfBlocks, true, \ 2512 "Clone compares and control flow through merge points to fold " \ 2513 "some branches") \ 2514 \ 2515 develop(intx, FastAllocateSizeLimit, 128*K, \ 2516 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2517 "Inline allocations larger than this in doublewords must go slow")\ 2518 \ 2519 product(bool, AggressiveOpts, false, \ 2520 "Enable aggressive optimizations - see arguments.cpp") \ 2521 \ 2522 product(bool, UseStringCache, false, \ 2523 "Enable String cache capabilities on String.java") \ 2524 \ 2525 /* statistics */ \ 2526 develop(bool, UseVTune, false, \ 2527 "enable support for Intel's VTune profiler") \ 2528 \ 2529 develop(bool, CountCompiledCalls, false, \ 2530 "counts method invocations") \ 2531 \ 2532 notproduct(bool, CountRuntimeCalls, false, \ 2533 "counts VM runtime calls") \ 2534 \ 2535 develop(bool, CountJNICalls, false, \ 2536 "counts jni method invocations") \ 2537 \ 2538 notproduct(bool, CountJVMCalls, false, \ 2539 "counts jvm method invocations") \ 2540 \ 2541 notproduct(bool, CountRemovableExceptions, false, \ 2542 "count exceptions that could be replaced by branches due to " \ 2543 "inlining") \ 2544 \ 2545 notproduct(bool, ICMissHistogram, false, \ 2546 "produce histogram of IC misses") \ 2547 \ 2548 notproduct(bool, PrintClassStatistics, false, \ 2549 "prints class statistics at end of run") \ 2550 \ 2551 notproduct(bool, PrintMethodStatistics, false, \ 2552 "prints method statistics at end of run") \ 2553 \ 2554 /* interpreter */ \ 2555 develop(bool, ClearInterpreterLocals, false, \ 2556 "Always clear local variables of interpreter activations upon " \ 2557 "entry") \ 2558 \ 2559 product_pd(bool, RewriteBytecodes, \ 2560 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2561 \ 2562 product_pd(bool, RewriteFrequentPairs, \ 2563 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2564 \ 2565 diagnostic(bool, PrintInterpreter, false, \ 2566 "Prints the generated interpreter code") \ 2567 \ 2568 product(bool, UseInterpreter, true, \ 2569 "Use interpreter for non-compiled methods") \ 2570 \ 2571 develop(bool, UseFastSignatureHandlers, true, \ 2572 "Use fast signature handlers for native calls") \ 2573 \ 2574 develop(bool, UseV8InstrsOnly, false, \ 2575 "Use SPARC-V8 Compliant instruction subset") \ 2576 \ 2577 product(bool, UseNiagaraInstrs, false, \ 2578 "Use Niagara-efficient instruction subset") \ 2579 \ 2580 develop(bool, UseCASForSwap, false, \ 2581 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2582 \ 2583 product(bool, UseLoopCounter, true, \ 2584 "Increment invocation counter on backward branch") \ 2585 \ 2586 product(bool, UseFastEmptyMethods, true, \ 2587 "Use fast method entry code for empty methods") \ 2588 \ 2589 product(bool, UseFastAccessorMethods, true, \ 2590 "Use fast method entry code for accessor methods") \ 2591 \ 2592 product_pd(bool, UseOnStackReplacement, \ 2593 "Use on stack replacement, calls runtime if invoc. counter " \ 2594 "overflows in loop") \ 2595 \ 2596 notproduct(bool, TraceOnStackReplacement, false, \ 2597 "Trace on stack replacement") \ 2598 \ 2599 develop(bool, PoisonOSREntry, true, \ 2600 "Detect abnormal calls to OSR code") \ 2601 \ 2602 product_pd(bool, PreferInterpreterNativeStubs, \ 2603 "Use always interpreter stubs for native methods invoked via " \ 2604 "interpreter") \ 2605 \ 2606 develop(bool, CountBytecodes, false, \ 2607 "Count number of bytecodes executed") \ 2608 \ 2609 develop(bool, PrintBytecodeHistogram, false, \ 2610 "Print histogram of the executed bytecodes") \ 2611 \ 2612 develop(bool, PrintBytecodePairHistogram, false, \ 2613 "Print histogram of the executed bytecode pairs") \ 2614 \ 2615 diagnostic(bool, PrintSignatureHandlers, false, \ 2616 "Print code generated for native method signature handlers") \ 2617 \ 2618 develop(bool, VerifyOops, false, \ 2619 "Do plausibility checks for oops") \ 2620 \ 2621 develop(bool, CheckUnhandledOops, false, \ 2622 "Check for unhandled oops in VM code") \ 2623 \ 2624 develop(bool, VerifyJNIFields, trueInDebug, \ 2625 "Verify jfieldIDs for instance fields") \ 2626 \ 2627 notproduct(bool, VerifyJNIEnvThread, false, \ 2628 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2629 "from JNI") \ 2630 \ 2631 develop(bool, VerifyFPU, false, \ 2632 "Verify FPU state (check for NaN's, etc.)") \ 2633 \ 2634 develop(bool, VerifyThread, false, \ 2635 "Watch the thread register for corruption (SPARC only)") \ 2636 \ 2637 develop(bool, VerifyActivationFrameSize, false, \ 2638 "Verify that activation frame didn't become smaller than its " \ 2639 "minimal size") \ 2640 \ 2641 develop(bool, TraceFrequencyInlining, false, \ 2642 "Trace frequency based inlining") \ 2643 \ 2644 notproduct(bool, TraceTypeProfile, false, \ 2645 "Trace type profile") \ 2646 \ 2647 develop_pd(bool, InlineIntrinsics, \ 2648 "Inline intrinsics that can be statically resolved") \ 2649 \ 2650 product_pd(bool, ProfileInterpreter, \ 2651 "Profile at the bytecode level during interpretation") \ 2652 \ 2653 develop_pd(bool, ProfileTraps, \ 2654 "Profile deoptimization traps at the bytecode level") \ 2655 \ 2656 product(intx, ProfileMaturityPercentage, 20, \ 2657 "number of method invocations/branches (expressed as % of " \ 2658 "CompileThreshold) before using the method's profile") \ 2659 \ 2660 develop(bool, PrintMethodData, false, \ 2661 "Print the results of +ProfileInterpreter at end of run") \ 2662 \ 2663 develop(bool, VerifyDataPointer, trueInDebug, \ 2664 "Verify the method data pointer during interpreter profiling") \ 2665 \ 2666 develop(bool, VerifyCompiledCode, false, \ 2667 "Include miscellaneous runtime verifications in nmethod code; " \ 2668 "default off because it disturbs nmethod size heuristics") \ 2669 \ 2670 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2671 "Manually make GC thread crash then dump java stack trace; " \ 2672 "Test only") \ 2673 \ 2674 /* compilation */ \ 2675 product(bool, UseCompiler, true, \ 2676 "use compilation") \ 2677 \ 2678 develop(bool, TraceCompilationPolicy, false, \ 2679 "Trace compilation policy") \ 2680 \ 2681 develop(bool, TimeCompilationPolicy, false, \ 2682 "Time the compilation policy") \ 2683 \ 2684 product(bool, UseCounterDecay, true, \ 2685 "adjust recompilation counters") \ 2686 \ 2687 develop(intx, CounterHalfLifeTime, 30, \ 2688 "half-life time of invocation counters (in secs)") \ 2689 \ 2690 develop(intx, CounterDecayMinIntervalLength, 500, \ 2691 "Min. ms. between invocation of CounterDecay") \ 2692 \ 2693 product(bool, AlwaysCompileLoopMethods, false, \ 2694 "when using recompilation, never interpret methods " \ 2695 "containing loops") \ 2696 \ 2697 product(bool, DontCompileHugeMethods, true, \ 2698 "don't compile methods > HugeMethodLimit") \ 2699 \ 2700 /* Bytecode escape analysis estimation. */ \ 2701 product(bool, EstimateArgEscape, true, \ 2702 "Analyze bytecodes to estimate escape state of arguments") \ 2703 \ 2704 product(intx, BCEATraceLevel, 0, \ 2705 "How much tracing to do of bytecode escape analysis estimates") \ 2706 \ 2707 product(intx, MaxBCEAEstimateLevel, 5, \ 2708 "Maximum number of nested calls that are analyzed by BC EA.") \ 2709 \ 2710 product(intx, MaxBCEAEstimateSize, 150, \ 2711 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2712 \ 2713 product(intx, AllocatePrefetchStyle, 1, \ 2714 "0 = no prefetch, " \ 2715 "1 = prefetch instructions for each allocation, " \ 2716 "2 = use TLAB watermark to gate allocation prefetch, " \ 2717 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2718 \ 2719 product(intx, AllocatePrefetchDistance, -1, \ 2720 "Distance to prefetch ahead of allocation pointer") \ 2721 \ 2722 product(intx, AllocatePrefetchLines, 1, \ 2723 "Number of lines to prefetch ahead of allocation pointer") \ 2724 \ 2725 product(intx, AllocatePrefetchStepSize, 16, \ 2726 "Step size in bytes of sequential prefetch instructions") \ 2727 \ 2728 product(intx, AllocatePrefetchInstr, 0, \ 2729 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2730 \ 2731 product(intx, ReadPrefetchInstr, 0, \ 2732 "Prefetch instruction to prefetch ahead") \ 2733 \ 2734 /* deoptimization */ \ 2735 develop(bool, TraceDeoptimization, false, \ 2736 "Trace deoptimization") \ 2737 \ 2738 develop(bool, DebugDeoptimization, false, \ 2739 "Tracing various information while debugging deoptimization") \ 2740 \ 2741 product(intx, SelfDestructTimer, 0, \ 2742 "Will cause VM to terminate after a given time (in minutes) " \ 2743 "(0 means off)") \ 2744 \ 2745 product(intx, MaxJavaStackTraceDepth, 1024, \ 2746 "Max. no. of lines in the stack trace for Java exceptions " \ 2747 "(0 means all)") \ 2748 \ 2749 develop(intx, GuaranteedSafepointInterval, 1000, \ 2750 "Guarantee a safepoint (at least) every so many milliseconds " \ 2751 "(0 means none)") \ 2752 \ 2753 product(intx, SafepointTimeoutDelay, 10000, \ 2754 "Delay in milliseconds for option SafepointTimeout") \ 2755 \ 2756 product(intx, NmethodSweepFraction, 4, \ 2757 "Number of invocations of sweeper to cover all nmethods") \ 2758 \ 2759 product(intx, NmethodSweepCheckInterval, 5, \ 2760 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2761 \ 2762 notproduct(intx, MemProfilingInterval, 500, \ 2763 "Time between each invocation of the MemProfiler") \ 2764 \ 2765 develop(intx, MallocCatchPtr, -1, \ 2766 "Hit breakpoint when mallocing/freeing this pointer") \ 2767 \ 2768 notproduct(intx, AssertRepeat, 1, \ 2769 "number of times to evaluate expression in assert " \ 2770 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2771 \ 2772 notproduct(ccstrlist, SuppressErrorAt, "", \ 2773 "List of assertions (file:line) to muzzle") \ 2774 \ 2775 notproduct(uintx, HandleAllocationLimit, 1024, \ 2776 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2777 "is used") \ 2778 \ 2779 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2780 "Threshold for total handle allocation when " \ 2781 "+TraceHandleAllocation is used") \ 2782 \ 2783 develop(intx, StackPrintLimit, 100, \ 2784 "number of stack frames to print in VM-level stack dump") \ 2785 \ 2786 notproduct(intx, MaxElementPrintSize, 256, \ 2787 "maximum number of elements to print") \ 2788 \ 2789 notproduct(intx, MaxSubklassPrintSize, 4, \ 2790 "maximum number of subklasses to print when printing klass") \ 2791 \ 2792 product(intx, MaxInlineLevel, 9, \ 2793 "maximum number of nested calls that are inlined") \ 2794 \ 2795 product(intx, MaxRecursiveInlineLevel, 1, \ 2796 "maximum number of nested recursive calls that are inlined") \ 2797 \ 2798 product_pd(intx, InlineSmallCode, \ 2799 "Only inline already compiled methods if their code size is " \ 2800 "less than this") \ 2801 \ 2802 product(intx, MaxInlineSize, 35, \ 2803 "maximum bytecode size of a method to be inlined") \ 2804 \ 2805 product_pd(intx, FreqInlineSize, \ 2806 "maximum bytecode size of a frequent method to be inlined") \ 2807 \ 2808 product(intx, MaxTrivialSize, 6, \ 2809 "maximum bytecode size of a trivial method to be inlined") \ 2810 \ 2811 product(intx, MinInliningThreshold, 250, \ 2812 "min. invocation count a method needs to have to be inlined") \ 2813 \ 2814 develop(intx, AlignEntryCode, 4, \ 2815 "aligns entry code to specified value (in bytes)") \ 2816 \ 2817 develop(intx, MethodHistogramCutoff, 100, \ 2818 "cutoff value for method invoc. histogram (+CountCalls)") \ 2819 \ 2820 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2821 "# of interpreted methods to show in profile") \ 2822 \ 2823 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2824 "# of compiled methods to show in profile") \ 2825 \ 2826 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2827 "# of stub methods to show in profile") \ 2828 \ 2829 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2830 "# of runtime stub nodes to show in profile") \ 2831 \ 2832 product(intx, ProfileIntervalsTicks, 100, \ 2833 "# of ticks between printing of interval profile " \ 2834 "(+ProfileIntervals)") \ 2835 \ 2836 notproduct(intx, ScavengeALotInterval, 1, \ 2837 "Interval between which scavenge will occur with +ScavengeALot") \ 2838 \ 2839 notproduct(intx, FullGCALotInterval, 1, \ 2840 "Interval between which full gc will occur with +FullGCALot") \ 2841 \ 2842 notproduct(intx, FullGCALotStart, 0, \ 2843 "For which invocation to start FullGCAlot") \ 2844 \ 2845 notproduct(intx, FullGCALotDummies, 32*K, \ 2846 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2847 "to move") \ 2848 \ 2849 develop(intx, DontYieldALotInterval, 10, \ 2850 "Interval between which yields will be dropped (milliseconds)") \ 2851 \ 2852 develop(intx, MinSleepInterval, 1, \ 2853 "Minimum sleep() interval (milliseconds) when " \ 2854 "ConvertSleepToYield is off (used for SOLARIS)") \ 2855 \ 2856 product(intx, EventLogLength, 2000, \ 2857 "maximum nof events in event log") \ 2858 \ 2859 develop(intx, ProfilerPCTickThreshold, 15, \ 2860 "Number of ticks in a PC buckets to be a hotspot") \ 2861 \ 2862 notproduct(intx, DeoptimizeALotInterval, 5, \ 2863 "Number of exits until DeoptimizeALot kicks in") \ 2864 \ 2865 notproduct(intx, ZombieALotInterval, 5, \ 2866 "Number of exits until ZombieALot kicks in") \ 2867 \ 2868 develop(bool, StressNonEntrant, false, \ 2869 "Mark nmethods non-entrant at registration") \ 2870 \ 2871 diagnostic(intx, MallocVerifyInterval, 0, \ 2872 "if non-zero, verify C heap after every N calls to " \ 2873 "malloc/realloc/free") \ 2874 \ 2875 diagnostic(intx, MallocVerifyStart, 0, \ 2876 "if non-zero, start verifying C heap after Nth call to " \ 2877 "malloc/realloc/free") \ 2878 \ 2879 product(intx, TypeProfileWidth, 2, \ 2880 "number of receiver types to record in call/cast profile") \ 2881 \ 2882 develop(intx, BciProfileWidth, 2, \ 2883 "number of return bci's to record in ret profile") \ 2884 \ 2885 product(intx, PerMethodRecompilationCutoff, 400, \ 2886 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2887 \ 2888 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2889 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2890 \ 2891 product(intx, PerMethodTrapLimit, 100, \ 2892 "Limit on traps (of one kind) in a method (includes inlines)") \ 2893 \ 2894 product(intx, PerBytecodeTrapLimit, 4, \ 2895 "Limit on traps (of one kind) at a particular BCI") \ 2896 \ 2897 develop(intx, FreqCountInvocations, 1, \ 2898 "Scaling factor for branch frequencies (deprecated)") \ 2899 \ 2900 develop(intx, InlineFrequencyRatio, 20, \ 2901 "Ratio of call site execution to caller method invocation") \ 2902 \ 2903 develop_pd(intx, InlineFrequencyCount, \ 2904 "Count of call site execution necessary to trigger frequent " \ 2905 "inlining") \ 2906 \ 2907 develop(intx, InlineThrowCount, 50, \ 2908 "Force inlining of interpreted methods that throw this often") \ 2909 \ 2910 develop(intx, InlineThrowMaxSize, 200, \ 2911 "Force inlining of throwing methods smaller than this") \ 2912 \ 2913 product(intx, AliasLevel, 3, \ 2914 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2915 "2 for class split, 3 for unique instances") \ 2916 \ 2917 develop(bool, VerifyAliases, false, \ 2918 "perform extra checks on the results of alias analysis") \ 2919 \ 2920 develop(intx, ProfilerNodeSize, 1024, \ 2921 "Size in K to allocate for the Profile Nodes of each thread") \ 2922 \ 2923 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2924 "Number of times to spin wait on a v8 atomic operation lock") \ 2925 \ 2926 product(intx, ReadSpinIterations, 100, \ 2927 "Number of read attempts before a yield (spin inner loop)") \ 2928 \ 2929 product_pd(intx, PreInflateSpin, \ 2930 "Number of times to spin wait before inflation") \ 2931 \ 2932 product(intx, PreBlockSpin, 10, \ 2933 "Number of times to spin in an inflated lock before going to " \ 2934 "an OS lock") \ 2935 \ 2936 /* gc parameters */ \ 2937 product(uintx, InitialHeapSize, 0, \ 2938 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2939 \ 2940 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2941 "Maximum heap size (in bytes)") \ 2942 \ 2943 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2944 "Initial tenured generation size (in bytes)") \ 2945 \ 2946 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2947 "Initial new generation size (in bytes)") \ 2948 \ 2949 product(uintx, MaxNewSize, max_uintx, \ 2950 "Maximum new generation size (in bytes), max_uintx means set " \ 2951 "ergonomically") \ 2952 \ 2953 product(uintx, PretenureSizeThreshold, 0, \ 2954 "Maximum size in bytes of objects allocated in DefNew " \ 2955 "generation; zero means no maximum") \ 2956 \ 2957 product(uintx, TLABSize, 0, \ 2958 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2959 \ 2960 product(uintx, MinTLABSize, 2*K, \ 2961 "Minimum allowed TLAB size (in bytes)") \ 2962 \ 2963 product(uintx, TLABAllocationWeight, 35, \ 2964 "Allocation averaging weight") \ 2965 \ 2966 product(uintx, TLABWasteTargetPercent, 1, \ 2967 "Percentage of Eden that can be wasted") \ 2968 \ 2969 product(uintx, TLABRefillWasteFraction, 64, \ 2970 "Max TLAB waste at a refill (internal fragmentation)") \ 2971 \ 2972 product(uintx, TLABWasteIncrement, 4, \ 2973 "Increment allowed waste at slow allocation") \ 2974 \ 2975 product(intx, SurvivorRatio, 8, \ 2976 "Ratio of eden/survivor space size") \ 2977 \ 2978 product(intx, NewRatio, 2, \ 2979 "Ratio of new/old generation sizes") \ 2980 \ 2981 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2982 "Max percent of eden objects that will be live at scavenge") \ 2983 \ 2984 product_pd(uintx, NewSizeThreadIncrease, \ 2985 "Additional size added to desired new generation size per " \ 2986 "non-daemon thread (in bytes)") \ 2987 \ 2988 product_pd(uintx, PermSize, \ 2989 "Initial size of permanent generation (in bytes)") \ 2990 \ 2991 product_pd(uintx, MaxPermSize, \ 2992 "Maximum size of permanent generation (in bytes)") \ 2993 \ 2994 product(uintx, MinHeapFreeRatio, 40, \ 2995 "Min percentage of heap free after GC to avoid expansion") \ 2996 \ 2997 product(uintx, MaxHeapFreeRatio, 70, \ 2998 "Max percentage of heap free after GC to avoid shrinking") \ 2999 \ 3000 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3001 "Number of milliseconds per MB of free space in the heap") \ 3002 \ 3003 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3004 "Min change in heap space due to GC (in bytes)") \ 3005 \ 3006 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3007 "Min expansion of permanent heap (in bytes)") \ 3008 \ 3009 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3010 "Max expansion of permanent heap without full GC (in bytes)") \ 3011 \ 3012 product(intx, QueuedAllocationWarningCount, 0, \ 3013 "Number of times an allocation that queues behind a GC " \ 3014 "will retry before printing a warning") \ 3015 \ 3016 diagnostic(uintx, VerifyGCStartAt, 0, \ 3017 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3018 \ 3019 diagnostic(intx, VerifyGCLevel, 0, \ 3020 "Generation level at which to start +VerifyBefore/AfterGC") \ 3021 \ 3022 develop(uintx, ExitAfterGCNum, 0, \ 3023 "If non-zero, exit after this GC.") \ 3024 \ 3025 product(intx, MaxTenuringThreshold, 15, \ 3026 "Maximum value for tenuring threshold") \ 3027 \ 3028 product(intx, InitialTenuringThreshold, 7, \ 3029 "Initial value for tenuring threshold") \ 3030 \ 3031 product(intx, TargetSurvivorRatio, 50, \ 3032 "Desired percentage of survivor space used after scavenge") \ 3033 \ 3034 product(uintx, MarkSweepDeadRatio, 5, \ 3035 "Percentage (0-100) of the old gen allowed as dead wood." \ 3036 "Serial mark sweep treats this as both the min and max value." \ 3037 "CMS uses this value only if it falls back to mark sweep." \ 3038 "Par compact uses a variable scale based on the density of the" \ 3039 "generation and treats this as the max value when the heap is" \ 3040 "either completely full or completely empty. Par compact also" \ 3041 "has a smaller default value; see arguments.cpp.") \ 3042 \ 3043 product(uintx, PermMarkSweepDeadRatio, 20, \ 3044 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3045 "See MarkSweepDeadRatio for collector-specific comments.") \ 3046 \ 3047 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3048 "How often should we fully compact the heap (ignoring the dead " \ 3049 "space parameters)") \ 3050 \ 3051 product(intx, PrintCMSStatistics, 0, \ 3052 "Statistics for CMS") \ 3053 \ 3054 product(bool, PrintCMSInitiationStatistics, false, \ 3055 "Statistics for initiating a CMS collection") \ 3056 \ 3057 product(intx, PrintFLSStatistics, 0, \ 3058 "Statistics for CMS' FreeListSpace") \ 3059 \ 3060 product(intx, PrintFLSCensus, 0, \ 3061 "Census for CMS' FreeListSpace") \ 3062 \ 3063 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3064 "Delay in ms between expansion and allocation") \ 3065 \ 3066 product(intx, DeferThrSuspendLoopCount, 4000, \ 3067 "(Unstable) Number of times to iterate in safepoint loop " \ 3068 " before blocking VM threads ") \ 3069 \ 3070 product(intx, DeferPollingPageLoopCount, -1, \ 3071 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3072 "before changing safepoint polling page to RO ") \ 3073 \ 3074 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3075 \ 3076 product(bool, UseDepthFirstScavengeOrder, true, \ 3077 "true: the scavenge order will be depth-first, " \ 3078 "false: the scavenge order will be breadth-first") \ 3079 \ 3080 product(bool, PSChunkLargeArrays, true, \ 3081 "true: process large arrays in chunks") \ 3082 \ 3083 product(uintx, GCDrainStackTargetSize, 64, \ 3084 "how many entries we'll try to leave on the stack during " \ 3085 "parallel GC") \ 3086 \ 3087 /* stack parameters */ \ 3088 product_pd(intx, StackYellowPages, \ 3089 "Number of yellow zone (recoverable overflows) pages") \ 3090 \ 3091 product_pd(intx, StackRedPages, \ 3092 "Number of red zone (unrecoverable overflows) pages") \ 3093 \ 3094 product_pd(intx, StackShadowPages, \ 3095 "Number of shadow zone (for overflow checking) pages" \ 3096 " this should exceed the depth of the VM and native call stack") \ 3097 \ 3098 product_pd(intx, ThreadStackSize, \ 3099 "Thread Stack Size (in Kbytes)") \ 3100 \ 3101 product_pd(intx, VMThreadStackSize, \ 3102 "Non-Java Thread Stack Size (in Kbytes)") \ 3103 \ 3104 product_pd(intx, CompilerThreadStackSize, \ 3105 "Compiler Thread Stack Size (in Kbytes)") \ 3106 \ 3107 develop_pd(uintx, JVMInvokeMethodSlack, \ 3108 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3109 \ 3110 product(uintx, ThreadSafetyMargin, 50*M, \ 3111 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3112 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3113 "disable this feature") \ 3114 \ 3115 /* code cache parameters */ \ 3116 develop(uintx, CodeCacheSegmentSize, 64, \ 3117 "Code cache segment size (in bytes) - smallest unit of " \ 3118 "allocation") \ 3119 \ 3120 develop_pd(intx, CodeEntryAlignment, \ 3121 "Code entry alignment for generated code (in bytes)") \ 3122 \ 3123 product_pd(intx, OptoLoopAlignment, \ 3124 "Align inner loops to zero relative to this modulus") \ 3125 \ 3126 product_pd(uintx, InitialCodeCacheSize, \ 3127 "Initial code cache size (in bytes)") \ 3128 \ 3129 product_pd(uintx, ReservedCodeCacheSize, \ 3130 "Reserved code cache size (in bytes) - maximum code cache size") \ 3131 \ 3132 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3133 "When less than X space left, we stop compiling.") \ 3134 \ 3135 product_pd(uintx, CodeCacheExpansionSize, \ 3136 "Code cache expansion size (in bytes)") \ 3137 \ 3138 develop_pd(uintx, CodeCacheMinBlockLength, \ 3139 "Minimum number of segments in a code cache block.") \ 3140 \ 3141 notproduct(bool, ExitOnFullCodeCache, false, \ 3142 "Exit the VM if we fill the code cache.") \ 3143 \ 3144 product(bool, UseCodeCacheFlushing, false, \ 3145 "Attempt to clean the code cache before shutting off compiler") \ 3146 \ 3147 product(intx, MinCodeCacheFlushingInterval, 30, \ 3148 "Min number of seconds between code cache cleaning sessions") \ 3149 \ 3150 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3151 "When less than X space left, start code cache cleaning") \ 3152 \ 3153 /* interpreter debugging */ \ 3154 develop(intx, BinarySwitchThreshold, 5, \ 3155 "Minimal number of lookupswitch entries for rewriting to binary " \ 3156 "switch") \ 3157 \ 3158 develop(intx, StopInterpreterAt, 0, \ 3159 "Stops interpreter execution at specified bytecode number") \ 3160 \ 3161 develop(intx, TraceBytecodesAt, 0, \ 3162 "Traces bytecodes starting with specified bytecode number") \ 3163 \ 3164 /* compiler interface */ \ 3165 develop(intx, CIStart, 0, \ 3166 "the id of the first compilation to permit") \ 3167 \ 3168 develop(intx, CIStop, -1, \ 3169 "the id of the last compilation to permit") \ 3170 \ 3171 develop(intx, CIStartOSR, 0, \ 3172 "the id of the first osr compilation to permit " \ 3173 "(CICountOSR must be on)") \ 3174 \ 3175 develop(intx, CIStopOSR, -1, \ 3176 "the id of the last osr compilation to permit " \ 3177 "(CICountOSR must be on)") \ 3178 \ 3179 develop(intx, CIBreakAtOSR, -1, \ 3180 "id of osr compilation to break at") \ 3181 \ 3182 develop(intx, CIBreakAt, -1, \ 3183 "id of compilation to break at") \ 3184 \ 3185 product(ccstrlist, CompileOnly, "", \ 3186 "List of methods (pkg/class.name) to restrict compilation to") \ 3187 \ 3188 product(ccstr, CompileCommandFile, NULL, \ 3189 "Read compiler commands from this file [.hotspot_compiler]") \ 3190 \ 3191 product(ccstrlist, CompileCommand, "", \ 3192 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3193 \ 3194 product(bool, CICompilerCountPerCPU, false, \ 3195 "1 compiler thread for log(N CPUs)") \ 3196 \ 3197 develop(intx, CIFireOOMAt, -1, \ 3198 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3199 "(non-negative value throws OOM after this many CI accesses " \ 3200 "in each compile)") \ 3201 \ 3202 develop(intx, CIFireOOMAtDelay, -1, \ 3203 "Wait for this many CI accesses to occur in all compiles before " \ 3204 "beginning to throw OutOfMemoryErrors in each compile") \ 3205 \ 3206 notproduct(bool, CIObjectFactoryVerify, false, \ 3207 "enable potentially expensive verification in ciObjectFactory") \ 3208 \ 3209 /* Priorities */ \ 3210 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3211 \ 3212 product(intx, ThreadPriorityPolicy, 0, \ 3213 "0 : Normal. "\ 3214 " VM chooses priorities that are appropriate for normal "\ 3215 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3216 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3217 " map to lower native priority values. On Windows applications"\ 3218 " are allowed to use higher native priorities. However, with "\ 3219 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3220 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3221 " interfere with system threads. On Linux thread priorities "\ 3222 " are ignored because the OS does not support static priority "\ 3223 " in SCHED_OTHER scheduling class which is the only choice for"\ 3224 " non-root, non-realtime applications. "\ 3225 "1 : Aggressive. "\ 3226 " Java thread priorities map over to the entire range of "\ 3227 " native thread priorities. Higher Java thread priorities map "\ 3228 " to higher native thread priorities. This policy should be "\ 3229 " used with care, as sometimes it can cause performance "\ 3230 " degradation in the application and/or the entire system. On "\ 3231 " Linux this policy requires root privilege.") \ 3232 \ 3233 product(bool, ThreadPriorityVerbose, false, \ 3234 "print priority changes") \ 3235 \ 3236 product(intx, DefaultThreadPriority, -1, \ 3237 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3238 \ 3239 product(intx, CompilerThreadPriority, -1, \ 3240 "what priority should compiler threads run at (-1 means no change)") \ 3241 \ 3242 product(intx, VMThreadPriority, -1, \ 3243 "what priority should VM threads run at (-1 means no change)") \ 3244 \ 3245 product(bool, CompilerThreadHintNoPreempt, true, \ 3246 "(Solaris only) Give compiler threads an extra quanta") \ 3247 \ 3248 product(bool, VMThreadHintNoPreempt, false, \ 3249 "(Solaris only) Give VM thread an extra quanta") \ 3250 \ 3251 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3252 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3253 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3254 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3255 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3256 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3257 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3258 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3259 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3260 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3261 \ 3262 /* compiler debugging */ \ 3263 notproduct(intx, CompileTheWorldStartAt, 1, \ 3264 "First class to consider when using +CompileTheWorld") \ 3265 \ 3266 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3267 "Last class to consider when using +CompileTheWorld") \ 3268 \ 3269 develop(intx, NewCodeParameter, 0, \ 3270 "Testing Only: Create a dedicated integer parameter before " \ 3271 "putback") \ 3272 \ 3273 /* new oopmap storage allocation */ \ 3274 develop(intx, MinOopMapAllocation, 8, \ 3275 "Minimum number of OopMap entries in an OopMapSet") \ 3276 \ 3277 /* Background Compilation */ \ 3278 develop(intx, LongCompileThreshold, 50, \ 3279 "Used with +TraceLongCompiles") \ 3280 \ 3281 product(intx, StarvationMonitorInterval, 200, \ 3282 "Pause between each check in ms") \ 3283 \ 3284 /* recompilation */ \ 3285 product_pd(intx, CompileThreshold, \ 3286 "number of interpreted method invocations before (re-)compiling") \ 3287 \ 3288 product_pd(intx, BackEdgeThreshold, \ 3289 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3290 \ 3291 product(intx, Tier1BytecodeLimit, 10, \ 3292 "Must have at least this many bytecodes before tier1" \ 3293 "invocation counters are used") \ 3294 \ 3295 product_pd(intx, Tier2CompileThreshold, \ 3296 "threshold at which a tier 2 compilation is invoked") \ 3297 \ 3298 product_pd(intx, Tier2BackEdgeThreshold, \ 3299 "Back edge threshold at which a tier 2 compilation is invoked") \ 3300 \ 3301 product_pd(intx, Tier3CompileThreshold, \ 3302 "threshold at which a tier 3 compilation is invoked") \ 3303 \ 3304 product_pd(intx, Tier3BackEdgeThreshold, \ 3305 "Back edge threshold at which a tier 3 compilation is invoked") \ 3306 \ 3307 product_pd(intx, Tier4CompileThreshold, \ 3308 "threshold at which a tier 4 compilation is invoked") \ 3309 \ 3310 product_pd(intx, Tier4BackEdgeThreshold, \ 3311 "Back edge threshold at which a tier 4 compilation is invoked") \ 3312 \ 3313 product_pd(bool, TieredCompilation, \ 3314 "Enable two-tier compilation") \ 3315 \ 3316 product(bool, StressTieredRuntime, false, \ 3317 "Alternate client and server compiler on compile requests") \ 3318 \ 3319 product_pd(intx, OnStackReplacePercentage, \ 3320 "NON_TIERED number of method invocations/branches (expressed as %"\ 3321 "of CompileThreshold) before (re-)compiling OSR code") \ 3322 \ 3323 product(intx, InterpreterProfilePercentage, 33, \ 3324 "NON_TIERED number of method invocations/branches (expressed as %"\ 3325 "of CompileThreshold) before profiling in the interpreter") \ 3326 \ 3327 develop(intx, MaxRecompilationSearchLength, 10, \ 3328 "max. # frames to inspect searching for recompilee") \ 3329 \ 3330 develop(intx, MaxInterpretedSearchLength, 3, \ 3331 "max. # interp. frames to skip when searching for recompilee") \ 3332 \ 3333 develop(intx, DesiredMethodLimit, 8000, \ 3334 "desired max. method size (in bytecodes) after inlining") \ 3335 \ 3336 develop(intx, HugeMethodLimit, 8000, \ 3337 "don't compile methods larger than this if " \ 3338 "+DontCompileHugeMethods") \ 3339 \ 3340 /* New JDK 1.4 reflection implementation */ \ 3341 \ 3342 develop(bool, UseNewReflection, true, \ 3343 "Temporary flag for transition to reflection based on dynamic " \ 3344 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3345 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3346 "changes were needed") \ 3347 \ 3348 develop(bool, VerifyReflectionBytecodes, false, \ 3349 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3350 "in situations like that described in 4486457 or for " \ 3351 "constructors generated for serialization, so can not be enabled "\ 3352 "in product.") \ 3353 \ 3354 product(bool, ReflectionWrapResolutionErrors, true, \ 3355 "Temporary flag for transition to AbstractMethodError wrapped " \ 3356 "in InvocationTargetException. See 6531596") \ 3357 \ 3358 \ 3359 develop(intx, FastSuperclassLimit, 8, \ 3360 "Depth of hardwired instanceof accelerator array") \ 3361 \ 3362 /* Properties for Java libraries */ \ 3363 \ 3364 product(intx, MaxDirectMemorySize, -1, \ 3365 "Maximum total size of NIO direct-buffer allocations") \ 3366 \ 3367 /* temporary developer defined flags */ \ 3368 \ 3369 diagnostic(bool, UseNewCode, false, \ 3370 "Testing Only: Use the new version while testing") \ 3371 \ 3372 diagnostic(bool, UseNewCode2, false, \ 3373 "Testing Only: Use the new version while testing") \ 3374 \ 3375 diagnostic(bool, UseNewCode3, false, \ 3376 "Testing Only: Use the new version while testing") \ 3377 \ 3378 /* flags for performance data collection */ \ 3379 \ 3380 product(bool, UsePerfData, true, \ 3381 "Flag to disable jvmstat instrumentation for performance testing" \ 3382 "and problem isolation purposes.") \ 3383 \ 3384 product(bool, PerfDataSaveToFile, false, \ 3385 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3386 \ 3387 product(ccstr, PerfDataSaveFile, NULL, \ 3388 "Save PerfData memory to the specified absolute pathname," \ 3389 "%p in the file name if present will be replaced by pid") \ 3390 \ 3391 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3392 "Data sampling interval in milliseconds") \ 3393 \ 3394 develop(bool, PerfTraceDataCreation, false, \ 3395 "Trace creation of Performance Data Entries") \ 3396 \ 3397 develop(bool, PerfTraceMemOps, false, \ 3398 "Trace PerfMemory create/attach/detach calls") \ 3399 \ 3400 product(bool, PerfDisableSharedMem, false, \ 3401 "Store performance data in standard memory") \ 3402 \ 3403 product(intx, PerfDataMemorySize, 32*K, \ 3404 "Size of performance data memory region. Will be rounded " \ 3405 "up to a multiple of the native os page size.") \ 3406 \ 3407 product(intx, PerfMaxStringConstLength, 1024, \ 3408 "Maximum PerfStringConstant string length before truncation") \ 3409 \ 3410 product(bool, PerfAllowAtExitRegistration, false, \ 3411 "Allow registration of atexit() methods") \ 3412 \ 3413 product(bool, PerfBypassFileSystemCheck, false, \ 3414 "Bypass Win32 file system criteria checks (Windows Only)") \ 3415 \ 3416 product(intx, UnguardOnExecutionViolation, 0, \ 3417 "Unguard page and retry on no-execute fault (Win32 only)" \ 3418 "0=off, 1=conservative, 2=aggressive") \ 3419 \ 3420 /* Serviceability Support */ \ 3421 \ 3422 product(bool, ManagementServer, false, \ 3423 "Create JMX Management Server") \ 3424 \ 3425 product(bool, DisableAttachMechanism, false, \ 3426 "Disable mechanism that allows tools to attach to this VM") \ 3427 \ 3428 product(bool, StartAttachListener, false, \ 3429 "Always start Attach Listener at VM startup") \ 3430 \ 3431 manageable(bool, PrintConcurrentLocks, false, \ 3432 "Print java.util.concurrent locks in thread dump") \ 3433 \ 3434 /* Shared spaces */ \ 3435 \ 3436 product(bool, UseSharedSpaces, true, \ 3437 "Use shared spaces in the permanent generation") \ 3438 \ 3439 product(bool, RequireSharedSpaces, false, \ 3440 "Require shared spaces in the permanent generation") \ 3441 \ 3442 product(bool, ForceSharedSpaces, false, \ 3443 "Require shared spaces in the permanent generation") \ 3444 \ 3445 product(bool, DumpSharedSpaces, false, \ 3446 "Special mode: JVM reads a class list, loads classes, builds " \ 3447 "shared spaces, and dumps the shared spaces to a file to be " \ 3448 "used in future JVM runs.") \ 3449 \ 3450 product(bool, PrintSharedSpaces, false, \ 3451 "Print usage of shared spaces") \ 3452 \ 3453 product(uintx, SharedDummyBlockSize, 512*M, \ 3454 "Size of dummy block used to shift heap addresses (in bytes)") \ 3455 \ 3456 product(uintx, SharedReadWriteSize, 12*M, \ 3457 "Size of read-write space in permanent generation (in bytes)") \ 3458 \ 3459 product(uintx, SharedReadOnlySize, 10*M, \ 3460 "Size of read-only space in permanent generation (in bytes)") \ 3461 \ 3462 product(uintx, SharedMiscDataSize, 4*M, \ 3463 "Size of the shared data area adjacent to the heap (in bytes)") \ 3464 \ 3465 product(uintx, SharedMiscCodeSize, 4*M, \ 3466 "Size of the shared code area adjacent to the heap (in bytes)") \ 3467 \ 3468 diagnostic(bool, SharedOptimizeColdStart, true, \ 3469 "At dump time, order shared objects to achieve better " \ 3470 "cold startup time.") \ 3471 \ 3472 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3473 "Reordering policy for SharedOptimizeColdStart " \ 3474 "0=favor classload-time locality, 1=balanced, " \ 3475 "2=favor runtime locality") \ 3476 \ 3477 diagnostic(bool, SharedSkipVerify, false, \ 3478 "Skip assert() and verify() which page-in unwanted shared " \ 3479 "objects. ") \ 3480 \ 3481 product(bool, AnonymousClasses, false, \ 3482 "support sun.misc.Unsafe.defineAnonymousClass") \ 3483 \ 3484 experimental(bool, EnableMethodHandles, false, \ 3485 "support method handles (true by default under JSR 292)") \ 3486 \ 3487 diagnostic(intx, MethodHandlePushLimit, 3, \ 3488 "number of additional stack slots a method handle may push") \ 3489 \ 3490 develop(bool, TraceMethodHandles, false, \ 3491 "trace internal method handle operations") \ 3492 \ 3493 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3494 "perform extra checks when constructing method handles") \ 3495 \ 3496 diagnostic(bool, OptimizeMethodHandles, true, \ 3497 "when constructing method handles, try to improve them") \ 3498 \ 3499 experimental(bool, TrustFinalNonStaticFields, false, \ 3500 "trust final non-static declarations for constant folding") \ 3501 \ 3502 experimental(bool, EnableInvokeDynamic, false, \ 3503 "recognize the invokedynamic instruction") \ 3504 \ 3505 develop(bool, TraceInvokeDynamic, false, \ 3506 "trace internal invoke dynamic operations") \ 3507 \ 3508 diagnostic(bool, PauseAtStartup, false, \ 3509 "Causes the VM to pause at startup time and wait for the pause " \ 3510 "file to be removed (default: ./vm.paused.<pid>)") \ 3511 \ 3512 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3513 "The file to create and for whose removal to await when pausing " \ 3514 "at startup. (default: ./vm.paused.<pid>)") \ 3515 \ 3516 product(bool, ExtendedDTraceProbes, false, \ 3517 "Enable performance-impacting dtrace probes") \ 3518 \ 3519 product(bool, DTraceMethodProbes, false, \ 3520 "Enable dtrace probes for method-entry and method-exit") \ 3521 \ 3522 product(bool, DTraceAllocProbes, false, \ 3523 "Enable dtrace probes for object allocation") \ 3524 \ 3525 product(bool, DTraceMonitorProbes, false, \ 3526 "Enable dtrace probes for monitor events") \ 3527 \ 3528 product(bool, RelaxAccessControlCheck, false, \ 3529 "Relax the access control checks in the verifier") \ 3530 \ 3531 diagnostic(bool, PrintDTraceDOF, false, \ 3532 "Print the DTrace DOF passed to the system for JSDT probes") \ 3533 \ 3534 product(bool, UseVMInterruptibleIO, false, \ 3535 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3536 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3537 " of this flag is true for JDK 6 and earliers") 3538 3539 3540/* 3541 * Macros for factoring of globals 3542 */ 3543 3544// Interface macros 3545#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3546#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3547#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3548#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3549#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3550#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3551#ifdef PRODUCT 3552#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3553#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3554#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3555#else 3556#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3557#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3558#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3559#endif 3560// Special LP64 flags, product only needed for now. 3561#ifdef _LP64 3562#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3563#else 3564#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3565#endif // _LP64 3566 3567// Implementation macros 3568#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3569#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3570#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3571#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3572#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3573#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3574#ifdef PRODUCT 3575#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3576#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3577#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3578#else 3579#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3580#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3581#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3582#endif 3583#ifdef _LP64 3584#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3585#else 3586#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3587#endif // _LP64 3588 3589RUNTIME_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) 3590 3591RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3592