globals.hpp revision 1311:2a1472c30599
1/* 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#if !defined(COMPILER1) && !defined(COMPILER2) 26define_pd_global(bool, BackgroundCompilation, false); 27define_pd_global(bool, UseTLAB, false); 28define_pd_global(bool, CICompileOSR, false); 29define_pd_global(bool, UseTypeProfile, false); 30define_pd_global(bool, UseOnStackReplacement, false); 31define_pd_global(bool, InlineIntrinsics, false); 32define_pd_global(bool, PreferInterpreterNativeStubs, true); 33define_pd_global(bool, ProfileInterpreter, false); 34define_pd_global(bool, ProfileTraps, false); 35define_pd_global(bool, TieredCompilation, false); 36 37define_pd_global(intx, CompileThreshold, 0); 38define_pd_global(intx, Tier2CompileThreshold, 0); 39define_pd_global(intx, Tier3CompileThreshold, 0); 40define_pd_global(intx, Tier4CompileThreshold, 0); 41 42define_pd_global(intx, BackEdgeThreshold, 0); 43define_pd_global(intx, Tier2BackEdgeThreshold, 0); 44define_pd_global(intx, Tier3BackEdgeThreshold, 0); 45define_pd_global(intx, Tier4BackEdgeThreshold, 0); 46 47define_pd_global(intx, OnStackReplacePercentage, 0); 48define_pd_global(bool, ResizeTLAB, false); 49define_pd_global(intx, FreqInlineSize, 0); 50define_pd_global(intx, InlineSmallCode, 0); 51define_pd_global(intx, NewSizeThreadIncrease, 4*K); 52define_pd_global(intx, InlineClassNatives, true); 53define_pd_global(intx, InlineUnsafeOps, true); 54define_pd_global(intx, InitialCodeCacheSize, 160*K); 55define_pd_global(intx, ReservedCodeCacheSize, 32*M); 56define_pd_global(intx, CodeCacheExpansionSize, 32*K); 57define_pd_global(intx, CodeCacheMinBlockLength, 1); 58define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 59define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 60define_pd_global(bool, NeverActAsServerClassMachine, true); 61define_pd_global(uint64_t,MaxRAM, 1ULL*G); 62#define CI_COMPILER_COUNT 0 63#else 64 65#ifdef COMPILER2 66#define CI_COMPILER_COUNT 2 67#else 68#define CI_COMPILER_COUNT 1 69#endif // COMPILER2 70 71#endif // no compilers 72 73 74// string type aliases used only in this file 75typedef const char* ccstr; 76typedef const char* ccstrlist; // represents string arguments which accumulate 77 78enum FlagValueOrigin { 79 DEFAULT = 0, 80 COMMAND_LINE = 1, 81 ENVIRON_VAR = 2, 82 CONFIG_FILE = 3, 83 MANAGEMENT = 4, 84 ERGONOMIC = 5, 85 ATTACH_ON_DEMAND = 6, 86 INTERNAL = 99 87}; 88 89struct Flag { 90 const char *type; 91 const char *name; 92 void* addr; 93 const char *kind; 94 FlagValueOrigin origin; 95 96 // points to all Flags static array 97 static Flag *flags; 98 99 // number of flags 100 static size_t numFlags; 101 102 static Flag* find_flag(char* name, size_t length); 103 104 bool is_bool() const { return strcmp(type, "bool") == 0; } 105 bool get_bool() const { return *((bool*) addr); } 106 void set_bool(bool value) { *((bool*) addr) = value; } 107 108 bool is_intx() const { return strcmp(type, "intx") == 0; } 109 intx get_intx() const { return *((intx*) addr); } 110 void set_intx(intx value) { *((intx*) addr) = value; } 111 112 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 113 uintx get_uintx() const { return *((uintx*) addr); } 114 void set_uintx(uintx value) { *((uintx*) addr) = value; } 115 116 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 117 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 118 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 119 120 bool is_double() const { return strcmp(type, "double") == 0; } 121 double get_double() const { return *((double*) addr); } 122 void set_double(double value) { *((double*) addr) = value; } 123 124 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 125 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 126 ccstr get_ccstr() const { return *((ccstr*) addr); } 127 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 128 129 bool is_unlocker() const; 130 bool is_unlocked() const; 131 bool is_writeable() const; 132 bool is_external() const; 133 134 void print_on(outputStream* st); 135 void print_as_flag(outputStream* st); 136}; 137 138// debug flags control various aspects of the VM and are global accessible 139 140// use FlagSetting to temporarily change some debug flag 141// e.g. FlagSetting fs(DebugThisAndThat, true); 142// restored to previous value upon leaving scope 143class FlagSetting { 144 bool val; 145 bool* flag; 146 public: 147 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 148 ~FlagSetting() { *flag = val; } 149}; 150 151 152class CounterSetting { 153 intx* counter; 154 public: 155 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 156 ~CounterSetting() { (*counter)--; } 157}; 158 159 160class IntFlagSetting { 161 intx val; 162 intx* flag; 163 public: 164 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 165 ~IntFlagSetting() { *flag = val; } 166}; 167 168 169class DoubleFlagSetting { 170 double val; 171 double* flag; 172 public: 173 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 174 ~DoubleFlagSetting() { *flag = val; } 175}; 176 177 178class CommandLineFlags { 179 public: 180 static bool boolAt(char* name, size_t len, bool* value); 181 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 182 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 183 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 184 185 static bool intxAt(char* name, size_t len, intx* value); 186 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 187 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 188 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 189 190 static bool uintxAt(char* name, size_t len, uintx* value); 191 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 192 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 193 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 194 195 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 196 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 197 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 198 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 199 200 static bool doubleAt(char* name, size_t len, double* value); 201 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 202 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 203 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 204 205 static bool ccstrAt(char* name, size_t len, ccstr* value); 206 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 207 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 208 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 209 210 // Returns false if name is not a command line flag. 211 static bool wasSetOnCmdline(const char* name, bool* value); 212 static void printSetFlags(); 213 214 static void printFlags(); 215 216 static void verify() PRODUCT_RETURN; 217}; 218 219// use this for flags that are true by default in the debug version but 220// false in the optimized version, and vice versa 221#ifdef ASSERT 222#define trueInDebug true 223#define falseInDebug false 224#else 225#define trueInDebug false 226#define falseInDebug true 227#endif 228 229// use this for flags that are true per default in the product build 230// but false in development builds, and vice versa 231#ifdef PRODUCT 232#define trueInProduct true 233#define falseInProduct false 234#else 235#define trueInProduct false 236#define falseInProduct true 237#endif 238 239// use this for flags that are true per default in the tiered build 240// but false in non-tiered builds, and vice versa 241#ifdef TIERED 242#define trueInTiered true 243#define falseInTiered false 244#else 245#define trueInTiered false 246#define falseInTiered true 247#endif 248 249// develop flags are settable / visible only during development and are constant in the PRODUCT version 250// product flags are always settable / visible 251// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 252 253// A flag must be declared with one of the following types: 254// bool, intx, uintx, ccstr. 255// The type "ccstr" is an alias for "const char*" and is used 256// only in this file, because the macrology requires single-token type names. 257 258// Note: Diagnostic options not meant for VM tuning or for product modes. 259// They are to be used for VM quality assurance or field diagnosis 260// of VM bugs. They are hidden so that users will not be encouraged to 261// try them as if they were VM ordinary execution options. However, they 262// are available in the product version of the VM. Under instruction 263// from support engineers, VM customers can turn them on to collect 264// diagnostic information about VM problems. To use a VM diagnostic 265// option, you must first specify +UnlockDiagnosticVMOptions. 266// (This master switch also affects the behavior of -Xprintflags.) 267// 268// experimental flags are in support of features that are not 269// part of the officially supported product, but are available 270// for experimenting with. They could, for example, be performance 271// features that may not have undergone full or rigorous QA, but which may 272// help performance in some cases and released for experimentation 273// by the community of users and developers. This flag also allows one to 274// be able to build a fully supported product that nonetheless also 275// ships with some unsupported, lightly tested, experimental features. 276// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 277// UnlockExperimentalVMOptions flag, which allows the control and 278// modification of the experimental flags. 279// 280// manageable flags are writeable external product flags. 281// They are dynamically writeable through the JDK management interface 282// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 283// These flags are external exported interface (see CCC). The list of 284// manageable flags can be queried programmatically through the management 285// interface. 286// 287// A flag can be made as "manageable" only if 288// - the flag is defined in a CCC as an external exported interface. 289// - the VM implementation supports dynamic setting of the flag. 290// This implies that the VM must *always* query the flag variable 291// and not reuse state related to the flag state at any given time. 292// - you want the flag to be queried programmatically by the customers. 293// 294// product_rw flags are writeable internal product flags. 295// They are like "manageable" flags but for internal/private use. 296// The list of product_rw flags are internal/private flags which 297// may be changed/removed in a future release. It can be set 298// through the management interface to get/set value 299// when the name of flag is supplied. 300// 301// A flag can be made as "product_rw" only if 302// - the VM implementation supports dynamic setting of the flag. 303// This implies that the VM must *always* query the flag variable 304// and not reuse state related to the flag state at any given time. 305// 306// Note that when there is a need to support develop flags to be writeable, 307// it can be done in the same way as product_rw. 308 309#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 310 \ 311 lp64_product(bool, UseCompressedOops, false, \ 312 "Use 32-bit object references in 64-bit VM. " \ 313 "lp64_product means flag is always constant in 32 bit VM") \ 314 \ 315 notproduct(bool, CheckCompressedOops, true, \ 316 "generate checks in encoding/decoding code in debug VM") \ 317 \ 318 product_pd(uintx, HeapBaseMinAddress, \ 319 "OS specific low limit for heap base address") \ 320 \ 321 diagnostic(bool, PrintCompressedOopsMode, false, \ 322 "Print compressed oops base address and encoding mode") \ 323 \ 324 /* UseMembar is theoretically a temp flag used for memory barrier \ 325 * removal testing. It was supposed to be removed before FCS but has \ 326 * been re-added (see 6401008) */ \ 327 product(bool, UseMembar, false, \ 328 "(Unstable) Issues membars on thread state transitions") \ 329 \ 330 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 develop(bool, Verbose, false, \ 656 "Prints additional debugging information from other modes") \ 657 \ 658 develop(bool, PrintMiscellaneous, false, \ 659 "Prints uncategorized debugging information (requires +Verbose)") \ 660 \ 661 develop(bool, WizardMode, false, \ 662 "Prints much more debugging information") \ 663 \ 664 product(bool, ShowMessageBoxOnError, false, \ 665 "Keep process alive on VM fatal error") \ 666 \ 667 product_pd(bool, UseOSErrorReporting, \ 668 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 669 \ 670 product(bool, SuppressFatalErrorMessage, false, \ 671 "Do NO Fatal Error report [Avoid deadlock]") \ 672 \ 673 product(ccstrlist, OnError, "", \ 674 "Run user-defined commands on fatal error; see VMError.cpp " \ 675 "for examples") \ 676 \ 677 product(ccstrlist, OnOutOfMemoryError, "", \ 678 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 679 \ 680 manageable(bool, HeapDumpBeforeFullGC, false, \ 681 "Dump heap to file before any major stop-world GC") \ 682 \ 683 manageable(bool, HeapDumpAfterFullGC, false, \ 684 "Dump heap to file after any major stop-world GC") \ 685 \ 686 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 687 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 688 \ 689 manageable(ccstr, HeapDumpPath, NULL, \ 690 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 691 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 692 "in the working directory)") \ 693 \ 694 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 695 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 696 "when the heap usage is larger than this") \ 697 \ 698 develop(uintx, HeapDumpSegmentSize, 1*G, \ 699 "Approximate segment size when generating a segmented heap dump") \ 700 \ 701 develop(bool, BreakAtWarning, false, \ 702 "Execute breakpoint upon encountering VM warning") \ 703 \ 704 product_pd(bool, UseVectoredExceptions, \ 705 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 706 \ 707 develop(bool, TraceVMOperation, false, \ 708 "Trace vm operations") \ 709 \ 710 develop(bool, UseFakeTimers, false, \ 711 "Tells whether the VM should use system time or a fake timer") \ 712 \ 713 diagnostic(bool, LogCompilation, false, \ 714 "Log compilation activity in detail to hotspot.log or LogFile") \ 715 \ 716 product(bool, PrintCompilation, false, \ 717 "Print compilations") \ 718 \ 719 diagnostic(bool, TraceNMethodInstalls, false, \ 720 "Trace nmethod intallation") \ 721 \ 722 diagnostic(intx, ScavengeRootsInCode, 0, \ 723 "0: do not allow scavengable oops in the code cache; " \ 724 "1: allow scavenging from the code cache; " \ 725 "2: emit as many constants as the compiler can see") \ 726 \ 727 diagnostic(bool, TraceOSRBreakpoint, false, \ 728 "Trace OSR Breakpoint ") \ 729 \ 730 diagnostic(bool, TraceCompileTriggered, false, \ 731 "Trace compile triggered") \ 732 \ 733 diagnostic(bool, TraceTriggers, false, \ 734 "Trace triggers") \ 735 \ 736 product(bool, AlwaysRestoreFPU, false, \ 737 "Restore the FPU control word after every JNI call (expensive)") \ 738 \ 739 notproduct(bool, PrintCompilation2, false, \ 740 "Print additional statistics per compilation") \ 741 \ 742 diagnostic(bool, PrintAdapterHandlers, false, \ 743 "Print code generated for i2c/c2i adapters") \ 744 \ 745 develop(bool, VerifyAdapterSharing, false, \ 746 "Verify that the code for shared adapters is the equivalent") \ 747 \ 748 diagnostic(bool, PrintAssembly, false, \ 749 "Print assembly code (using external disassembler.so)") \ 750 \ 751 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 752 "Options string passed to disassembler.so") \ 753 \ 754 diagnostic(bool, PrintNMethods, false, \ 755 "Print assembly code for nmethods when generated") \ 756 \ 757 diagnostic(bool, PrintNativeNMethods, false, \ 758 "Print assembly code for native nmethods when generated") \ 759 \ 760 develop(bool, PrintDebugInfo, false, \ 761 "Print debug information for all nmethods when generated") \ 762 \ 763 develop(bool, PrintRelocations, false, \ 764 "Print relocation information for all nmethods when generated") \ 765 \ 766 develop(bool, PrintDependencies, false, \ 767 "Print dependency information for all nmethods when generated") \ 768 \ 769 develop(bool, PrintExceptionHandlers, false, \ 770 "Print exception handler tables for all nmethods when generated") \ 771 \ 772 develop(bool, InterceptOSException, false, \ 773 "Starts debugger when an implicit OS (e.g., NULL) " \ 774 "exception happens") \ 775 \ 776 notproduct(bool, PrintCodeCache, false, \ 777 "Print the compiled_code cache when exiting") \ 778 \ 779 develop(bool, PrintCodeCache2, false, \ 780 "Print detailed info on the compiled_code cache when exiting") \ 781 \ 782 diagnostic(bool, PrintStubCode, false, \ 783 "Print generated stub code") \ 784 \ 785 product(bool, StackTraceInThrowable, true, \ 786 "Collect backtrace in throwable when exception happens") \ 787 \ 788 product(bool, OmitStackTraceInFastThrow, true, \ 789 "Omit backtraces for some 'hot' exceptions in optimized code") \ 790 \ 791 product(bool, ProfilerPrintByteCodeStatistics, false, \ 792 "Prints byte code statictics when dumping profiler output") \ 793 \ 794 product(bool, ProfilerRecordPC, false, \ 795 "Collects tick for each 16 byte interval of compiled code") \ 796 \ 797 product(bool, ProfileVM, false, \ 798 "Profiles ticks that fall within VM (either in the VM Thread " \ 799 "or VM code called through stubs)") \ 800 \ 801 product(bool, ProfileIntervals, false, \ 802 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 803 \ 804 notproduct(bool, ProfilerCheckIntervals, false, \ 805 "Collect and print info on spacing of profiler ticks") \ 806 \ 807 develop(bool, PrintJVMWarnings, false, \ 808 "Prints warnings for unimplemented JVM functions") \ 809 \ 810 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 811 "Prints warnings for stalled SpinLocks") \ 812 \ 813 develop(bool, InitializeJavaLangSystem, true, \ 814 "Initialize java.lang.System - turn off for individual " \ 815 "method debugging") \ 816 \ 817 develop(bool, InitializeJavaLangString, true, \ 818 "Initialize java.lang.String - turn off for individual " \ 819 "method debugging") \ 820 \ 821 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 822 "Initialize various error and exception classes - turn off for " \ 823 "individual method debugging") \ 824 \ 825 product(bool, RegisterFinalizersAtInit, true, \ 826 "Register finalizable objects at end of Object.<init> or " \ 827 "after allocation") \ 828 \ 829 develop(bool, RegisterReferences, true, \ 830 "Tells whether the VM should register soft/weak/final/phantom " \ 831 "references") \ 832 \ 833 develop(bool, IgnoreRewrites, false, \ 834 "Supress rewrites of bytecodes in the oopmap generator. " \ 835 "This is unsafe!") \ 836 \ 837 develop(bool, PrintCodeCacheExtension, false, \ 838 "Print extension of code cache") \ 839 \ 840 develop(bool, UsePrivilegedStack, true, \ 841 "Enable the security JVM functions") \ 842 \ 843 develop(bool, IEEEPrecision, true, \ 844 "Enables IEEE precision (for INTEL only)") \ 845 \ 846 develop(bool, ProtectionDomainVerification, true, \ 847 "Verifies protection domain before resolution in system " \ 848 "dictionary") \ 849 \ 850 product(bool, ClassUnloading, true, \ 851 "Do unloading of classes") \ 852 \ 853 diagnostic(bool, LinkWellKnownClasses, false, \ 854 "Resolve a well known class as soon as its name is seen") \ 855 \ 856 develop(bool, DisableStartThread, false, \ 857 "Disable starting of additional Java threads " \ 858 "(for debugging only)") \ 859 \ 860 develop(bool, MemProfiling, false, \ 861 "Write memory usage profiling to log file") \ 862 \ 863 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 864 "Prints the system dictionary at exit") \ 865 \ 866 diagnostic(bool, UnsyncloadClass, false, \ 867 "Unstable: VM calls loadClass unsynchronized. Custom " \ 868 "class loader must call VM synchronized for findClass " \ 869 "and defineClass.") \ 870 \ 871 product(bool, AlwaysLockClassLoader, false, \ 872 "Require the VM to acquire the class loader lock before calling " \ 873 "loadClass() even for class loaders registering " \ 874 "as parallel capable") \ 875 \ 876 product(bool, AllowParallelDefineClass, false, \ 877 "Allow parallel defineClass requests for class loaders " \ 878 "registering as parallel capable") \ 879 \ 880 product(bool, MustCallLoadClassInternal, false, \ 881 "Call loadClassInternal() rather than loadClass()") \ 882 \ 883 product_pd(bool, DontYieldALot, \ 884 "Throw away obvious excess yield calls (for SOLARIS only)") \ 885 \ 886 product_pd(bool, ConvertSleepToYield, \ 887 "Converts sleep(0) to thread yield " \ 888 "(may be off for SOLARIS to improve GUI)") \ 889 \ 890 product(bool, ConvertYieldToSleep, false, \ 891 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 892 "behavior (SOLARIS only)") \ 893 \ 894 product(bool, UseBoundThreads, true, \ 895 "Bind user level threads to kernel threads (for SOLARIS only)") \ 896 \ 897 develop(bool, UseDetachedThreads, true, \ 898 "Use detached threads that are recycled upon termination " \ 899 "(for SOLARIS only)") \ 900 \ 901 product(bool, UseLWPSynchronization, true, \ 902 "Use LWP-based instead of libthread-based synchronization " \ 903 "(SPARC only)") \ 904 \ 905 product(ccstr, SyncKnobs, NULL, \ 906 "(Unstable) Various monitor synchronization tunables") \ 907 \ 908 product(intx, EmitSync, 0, \ 909 "(Unsafe,Unstable) " \ 910 " Controls emission of inline sync fast-path code") \ 911 \ 912 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 913 \ 914 product(intx, Atomics, 0, \ 915 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 916 \ 917 product(intx, FenceInstruction, 0, \ 918 "(Unsafe,Unstable) Experimental") \ 919 \ 920 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 921 \ 922 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 923 \ 924 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 925 \ 926 product(intx, hashCode, 0, \ 927 "(Unstable) select hashCode generation algorithm" ) \ 928 \ 929 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 930 "(Unstable, Linux-specific)" \ 931 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 932 \ 933 product(bool, FilterSpuriousWakeups, true, \ 934 "Prevent spurious or premature wakeups from object.wait " \ 935 "(Solaris only)") \ 936 \ 937 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 938 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 939 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 940 \ 941 develop(bool, UsePthreads, false, \ 942 "Use pthread-based instead of libthread-based synchronization " \ 943 "(SPARC only)") \ 944 \ 945 product(bool, AdjustConcurrency, false, \ 946 "call thr_setconcurrency at thread create time to avoid " \ 947 "LWP starvation on MP systems (For Solaris Only)") \ 948 \ 949 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 950 "Should the system attempt to update the compiler file when " \ 951 "an error occurs?") \ 952 \ 953 product(bool, ReduceSignalUsage, false, \ 954 "Reduce the use of OS signals in Java and/or the VM") \ 955 \ 956 notproduct(bool, ValidateMarkSweep, false, \ 957 "Do extra validation during MarkSweep collection") \ 958 \ 959 notproduct(bool, RecordMarkSweepCompaction, false, \ 960 "Enable GC-to-GC recording and querying of compaction during " \ 961 "MarkSweep") \ 962 \ 963 develop_pd(bool, ShareVtableStubs, \ 964 "Share vtable stubs (smaller code but worse branch prediction") \ 965 \ 966 develop(bool, LoadLineNumberTables, true, \ 967 "Tells whether the class file parser loads line number tables") \ 968 \ 969 develop(bool, LoadLocalVariableTables, true, \ 970 "Tells whether the class file parser loads local variable tables")\ 971 \ 972 develop(bool, LoadLocalVariableTypeTables, true, \ 973 "Tells whether the class file parser loads local variable type tables")\ 974 \ 975 product(bool, AllowUserSignalHandlers, false, \ 976 "Do not complain if the application installs signal handlers " \ 977 "(Solaris & Linux only)") \ 978 \ 979 product(bool, UseSignalChaining, true, \ 980 "Use signal-chaining to invoke signal handlers installed " \ 981 "by the application (Solaris & Linux only)") \ 982 \ 983 product(bool, UseAltSigs, false, \ 984 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 985 "internal signals (Solaris only)") \ 986 \ 987 product(bool, UseSpinning, false, \ 988 "Use spinning in monitor inflation and before entry") \ 989 \ 990 product(bool, PreSpinYield, false, \ 991 "Yield before inner spinning loop") \ 992 \ 993 product(bool, PostSpinYield, true, \ 994 "Yield after inner spinning loop") \ 995 \ 996 product(bool, AllowJNIEnvProxy, false, \ 997 "Allow JNIEnv proxies for jdbx") \ 998 \ 999 product(bool, JNIDetachReleasesMonitors, true, \ 1000 "JNI DetachCurrentThread releases monitors owned by thread") \ 1001 \ 1002 product(bool, RestoreMXCSROnJNICalls, false, \ 1003 "Restore MXCSR when returning from JNI calls") \ 1004 \ 1005 product(bool, CheckJNICalls, false, \ 1006 "Verify all arguments to JNI calls") \ 1007 \ 1008 product(bool, UseFastJNIAccessors, true, \ 1009 "Use optimized versions of Get<Primitive>Field") \ 1010 \ 1011 product(bool, EagerXrunInit, false, \ 1012 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1013 " but not all -Xrun libraries may support the state of the VM at this time") \ 1014 \ 1015 product(bool, PreserveAllAnnotations, false, \ 1016 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1017 \ 1018 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1019 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1020 \ 1021 product(bool, LazyBootClassLoader, true, \ 1022 "Enable/disable lazy opening of boot class path entries") \ 1023 \ 1024 diagnostic(bool, UseIncDec, true, \ 1025 "Use INC, DEC instructions on x86") \ 1026 \ 1027 product(bool, UseNewLongLShift, false, \ 1028 "Use optimized bitwise shift left") \ 1029 \ 1030 product(bool, UseStoreImmI16, true, \ 1031 "Use store immediate 16-bits value instruction on x86") \ 1032 \ 1033 product(bool, UseAddressNop, false, \ 1034 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1035 \ 1036 product(bool, UseXmmLoadAndClearUpper, true, \ 1037 "Load low part of XMM register and clear upper part") \ 1038 \ 1039 product(bool, UseXmmRegToRegMoveAll, false, \ 1040 "Copy all XMM register bits when moving value between registers") \ 1041 \ 1042 product(bool, UseXmmI2D, false, \ 1043 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1044 \ 1045 product(bool, UseXmmI2F, false, \ 1046 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1047 \ 1048 product(bool, UseXMMForArrayCopy, false, \ 1049 "Use SSE2 MOVQ instruction for Arraycopy") \ 1050 \ 1051 product(bool, UseUnalignedLoadStores, false, \ 1052 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1053 \ 1054 product(intx, FieldsAllocationStyle, 1, \ 1055 "0 - type based with oops first, 1 - with oops last") \ 1056 \ 1057 product(bool, CompactFields, true, \ 1058 "Allocate nonstatic fields in gaps between previous fields") \ 1059 \ 1060 notproduct(bool, PrintCompactFieldsSavings, false, \ 1061 "Print how many words were saved with CompactFields") \ 1062 \ 1063 product(bool, UseBiasedLocking, true, \ 1064 "Enable biased locking in JVM") \ 1065 \ 1066 product(intx, BiasedLockingStartupDelay, 4000, \ 1067 "Number of milliseconds to wait before enabling biased locking") \ 1068 \ 1069 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1070 "Print statistics of biased locking in JVM") \ 1071 \ 1072 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1073 "Threshold of number of revocations per type to try to " \ 1074 "rebias all objects in the heap of that type") \ 1075 \ 1076 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1077 "Threshold of number of revocations per type to permanently " \ 1078 "revoke biases of all objects in the heap of that type") \ 1079 \ 1080 product(intx, BiasedLockingDecayTime, 25000, \ 1081 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1082 "type after previous bulk rebias") \ 1083 \ 1084 /* tracing */ \ 1085 \ 1086 notproduct(bool, TraceRuntimeCalls, false, \ 1087 "Trace run-time calls") \ 1088 \ 1089 develop(bool, TraceJNICalls, false, \ 1090 "Trace JNI calls") \ 1091 \ 1092 notproduct(bool, TraceJVMCalls, false, \ 1093 "Trace JVM calls") \ 1094 \ 1095 product(ccstr, TraceJVMTI, NULL, \ 1096 "Trace flags for JVMTI functions and events") \ 1097 \ 1098 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1099 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1100 \ 1101 /* This option can change an EMCP method into an obsolete method. */ \ 1102 /* This can affect tests that except specific methods to be EMCP. */ \ 1103 /* This option should be used with caution. */ \ 1104 product(bool, StressLdcRewrite, false, \ 1105 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1106 \ 1107 product(intx, TraceRedefineClasses, 0, \ 1108 "Trace level for JVMTI RedefineClasses") \ 1109 \ 1110 /* change to false by default sometime after Mustang */ \ 1111 product(bool, VerifyMergedCPBytecodes, true, \ 1112 "Verify bytecodes after RedefineClasses constant pool merging") \ 1113 \ 1114 develop(bool, TraceJNIHandleAllocation, false, \ 1115 "Trace allocation/deallocation of JNI handle blocks") \ 1116 \ 1117 develop(bool, TraceThreadEvents, false, \ 1118 "Trace all thread events") \ 1119 \ 1120 develop(bool, TraceBytecodes, false, \ 1121 "Trace bytecode execution") \ 1122 \ 1123 develop(bool, TraceClassInitialization, false, \ 1124 "Trace class initialization") \ 1125 \ 1126 develop(bool, TraceExceptions, false, \ 1127 "Trace exceptions") \ 1128 \ 1129 develop(bool, TraceICs, false, \ 1130 "Trace inline cache changes") \ 1131 \ 1132 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1133 "Trace method invocation counter overflow") \ 1134 \ 1135 develop(bool, TraceInlineCacheClearing, false, \ 1136 "Trace clearing of inline caches in nmethods") \ 1137 \ 1138 develop(bool, TraceDependencies, false, \ 1139 "Trace dependencies") \ 1140 \ 1141 develop(bool, VerifyDependencies, trueInDebug, \ 1142 "Exercise and verify the compilation dependency mechanism") \ 1143 \ 1144 develop(bool, TraceNewOopMapGeneration, false, \ 1145 "Trace OopMapGeneration") \ 1146 \ 1147 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1148 "Trace OopMapGeneration: print detailed cell states") \ 1149 \ 1150 develop(bool, TimeOopMap, false, \ 1151 "Time calls to GenerateOopMap::compute_map() in sum") \ 1152 \ 1153 develop(bool, TimeOopMap2, false, \ 1154 "Time calls to GenerateOopMap::compute_map() individually") \ 1155 \ 1156 develop(bool, TraceMonitorMismatch, false, \ 1157 "Trace monitor matching failures during OopMapGeneration") \ 1158 \ 1159 develop(bool, TraceOopMapRewrites, false, \ 1160 "Trace rewritting of method oops during oop map generation") \ 1161 \ 1162 develop(bool, TraceSafepoint, false, \ 1163 "Trace safepoint operations") \ 1164 \ 1165 develop(bool, TraceICBuffer, false, \ 1166 "Trace usage of IC buffer") \ 1167 \ 1168 develop(bool, TraceCompiledIC, false, \ 1169 "Trace changes of compiled IC") \ 1170 \ 1171 notproduct(bool, TraceZapDeadLocals, false, \ 1172 "Trace zapping dead locals") \ 1173 \ 1174 develop(bool, TraceStartupTime, false, \ 1175 "Trace setup time") \ 1176 \ 1177 develop(bool, TraceHPI, false, \ 1178 "Trace Host Porting Interface (HPI)") \ 1179 \ 1180 product(ccstr, HPILibPath, NULL, \ 1181 "Specify alternate path to HPI library") \ 1182 \ 1183 develop(bool, TraceProtectionDomainVerification, false, \ 1184 "Trace protection domain verifcation") \ 1185 \ 1186 develop(bool, TraceClearedExceptions, false, \ 1187 "Prints when an exception is forcibly cleared") \ 1188 \ 1189 product(bool, TraceClassResolution, false, \ 1190 "Trace all constant pool resolutions (for debugging)") \ 1191 \ 1192 product(bool, TraceBiasedLocking, false, \ 1193 "Trace biased locking in JVM") \ 1194 \ 1195 product(bool, TraceMonitorInflation, false, \ 1196 "Trace monitor inflation in JVM") \ 1197 \ 1198 /* assembler */ \ 1199 product(bool, Use486InstrsOnly, false, \ 1200 "Use 80486 Compliant instruction subset") \ 1201 \ 1202 /* gc */ \ 1203 \ 1204 product(bool, UseSerialGC, false, \ 1205 "Use the serial garbage collector") \ 1206 \ 1207 product(bool, UseG1GC, false, \ 1208 "Use the Garbage-First garbage collector") \ 1209 \ 1210 product(bool, UseParallelGC, false, \ 1211 "Use the Parallel Scavenge garbage collector") \ 1212 \ 1213 product(bool, UseParallelOldGC, false, \ 1214 "Use the Parallel Old garbage collector") \ 1215 \ 1216 product(bool, UseParallelOldGCCompacting, true, \ 1217 "In the Parallel Old garbage collector use parallel compaction") \ 1218 \ 1219 product(bool, UseParallelDensePrefixUpdate, true, \ 1220 "In the Parallel Old garbage collector use parallel dense" \ 1221 " prefix update") \ 1222 \ 1223 product(uintx, HeapMaximumCompactionInterval, 20, \ 1224 "How often should we maximally compact the heap (not allowing " \ 1225 "any dead space)") \ 1226 \ 1227 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1228 "The collection count for the first maximum compaction") \ 1229 \ 1230 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1231 "In the Parallel Old garbage collector maximum compaction for " \ 1232 "a system GC") \ 1233 \ 1234 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1235 "The mean used by the par compact dead wood" \ 1236 "limiter (a number between 0-100).") \ 1237 \ 1238 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1239 "The standard deviation used by the par compact dead wood" \ 1240 "limiter (a number between 0-100).") \ 1241 \ 1242 product(bool, UseParallelOldGCDensePrefix, true, \ 1243 "Use a dense prefix with the Parallel Old garbage collector") \ 1244 \ 1245 product(uintx, ParallelGCThreads, 0, \ 1246 "Number of parallel threads parallel gc will use") \ 1247 \ 1248 develop(bool, ParallelOldGCSplitALot, false, \ 1249 "Provoke splitting (copying data from a young gen space to" \ 1250 "multiple destination spaces)") \ 1251 \ 1252 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1253 "How often to provoke splitting a young gen space") \ 1254 \ 1255 develop(bool, TraceRegionTasksQueuing, false, \ 1256 "Trace the queuing of the region tasks") \ 1257 \ 1258 product(uintx, ConcGCThreads, 0, \ 1259 "Number of threads concurrent gc will use") \ 1260 \ 1261 product(uintx, YoungPLABSize, 4096, \ 1262 "Size of young gen promotion labs (in HeapWords)") \ 1263 \ 1264 product(uintx, OldPLABSize, 1024, \ 1265 "Size of old gen promotion labs (in HeapWords)") \ 1266 \ 1267 product(uintx, GCTaskTimeStampEntries, 200, \ 1268 "Number of time stamp entries per gc worker thread") \ 1269 \ 1270 product(bool, AlwaysTenure, false, \ 1271 "Always tenure objects in eden. (ParallelGC only)") \ 1272 \ 1273 product(bool, NeverTenure, false, \ 1274 "Never tenure objects in eden, May tenure on overflow " \ 1275 "(ParallelGC only)") \ 1276 \ 1277 product(bool, ScavengeBeforeFullGC, true, \ 1278 "Scavenge youngest generation before each full GC, " \ 1279 "used with UseParallelGC") \ 1280 \ 1281 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1282 "Allow scavenges to occur when to_space contains objects.") \ 1283 \ 1284 product(bool, UseConcMarkSweepGC, false, \ 1285 "Use Concurrent Mark-Sweep GC in the old generation") \ 1286 \ 1287 product(bool, ExplicitGCInvokesConcurrent, false, \ 1288 "A System.gc() request invokes a concurrent collection;" \ 1289 " (effective only when UseConcMarkSweepGC)") \ 1290 \ 1291 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1292 "A System.gc() request invokes a concurrent collection and " \ 1293 "also unloads classes during such a concurrent gc cycle " \ 1294 "(effective only when UseConcMarkSweepGC)") \ 1295 \ 1296 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1297 "Use Adaptive Free Lists in the CMS generation") \ 1298 \ 1299 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1300 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1301 \ 1302 develop(bool, RotateCMSCollectionTypes, false, \ 1303 "Rotate the CMS collections among concurrent and STW") \ 1304 \ 1305 product(bool, UseCMSBestFit, true, \ 1306 "Use CMS best fit allocation strategy") \ 1307 \ 1308 product(bool, UseCMSCollectionPassing, true, \ 1309 "Use passing of collection from background to foreground") \ 1310 \ 1311 product(bool, UseParNewGC, false, \ 1312 "Use parallel threads in the new generation.") \ 1313 \ 1314 product(bool, ParallelGCVerbose, false, \ 1315 "Verbose output for parallel GC.") \ 1316 \ 1317 product(intx, ParallelGCBufferWastePct, 10, \ 1318 "wasted fraction of parallel allocation buffer.") \ 1319 \ 1320 product(bool, ParallelGCRetainPLAB, true, \ 1321 "Retain parallel allocation buffers across scavenges.") \ 1322 \ 1323 product(intx, TargetPLABWastePct, 10, \ 1324 "target wasted space in last buffer as pct of overall allocation")\ 1325 \ 1326 product(uintx, PLABWeight, 75, \ 1327 "Percentage (0-100) used to weight the current sample when" \ 1328 "computing exponentially decaying average for ResizePLAB.") \ 1329 \ 1330 product(bool, ResizePLAB, true, \ 1331 "Dynamically resize (survivor space) promotion labs") \ 1332 \ 1333 product(bool, PrintPLAB, false, \ 1334 "Print (survivor space) promotion labs sizing decisions") \ 1335 \ 1336 product(intx, ParGCArrayScanChunk, 50, \ 1337 "Scan a subset and push remainder, if array is bigger than this") \ 1338 \ 1339 product(bool, ParGCUseLocalOverflow, false, \ 1340 "Instead of a global overflow list, use local overflow stacks") \ 1341 \ 1342 product(bool, ParGCTrimOverflow, true, \ 1343 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1344 \ 1345 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1346 "Whether we should simulate work queue overflow in ParNew") \ 1347 \ 1348 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1349 "An `interval' counter that determines how frequently " \ 1350 "we simulate overflow; a smaller number increases frequency") \ 1351 \ 1352 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1353 "The desired number of objects to claim from the overflow list") \ 1354 \ 1355 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1356 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1357 "parallel GC.") \ 1358 \ 1359 product(uintx, OldPLABWeight, 50, \ 1360 "Percentage (0-100) used to weight the current sample when" \ 1361 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1362 \ 1363 product(bool, ResizeOldPLAB, true, \ 1364 "Dynamically resize (old gen) promotion labs") \ 1365 \ 1366 product(bool, PrintOldPLAB, false, \ 1367 "Print (old gen) promotion labs sizing decisions") \ 1368 \ 1369 product(uintx, CMSOldPLABMin, 16, \ 1370 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1371 \ 1372 product(uintx, CMSOldPLABMax, 1024, \ 1373 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1374 \ 1375 product(uintx, CMSOldPLABNumRefills, 4, \ 1376 "Nominal number of refills of CMS gen promotion lab cache" \ 1377 " per worker per block size") \ 1378 \ 1379 product(bool, CMSOldPLABResizeQuicker, false, \ 1380 "Whether to react on-the-fly during a scavenge to a sudden" \ 1381 " change in block demand rate") \ 1382 \ 1383 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1384 "The tolerance of the phase-change detector for on-the-fly" \ 1385 " PLAB resizing during a scavenge") \ 1386 \ 1387 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1388 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1389 " during a scavenge") \ 1390 \ 1391 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1392 "The clamping of the gain in the feedback loop for on-the-fly" \ 1393 " PLAB resizing during a scavenge") \ 1394 \ 1395 product(bool, AlwaysPreTouch, false, \ 1396 "It forces all freshly committed pages to be pre-touched.") \ 1397 \ 1398 product(bool, CMSUseOldDefaults, false, \ 1399 "A flag temporarily introduced to allow reverting to some " \ 1400 "older default settings; older as of 6.0") \ 1401 \ 1402 product(intx, CMSYoungGenPerWorker, 16*M, \ 1403 "The amount of young gen chosen by default per GC worker " \ 1404 "thread available") \ 1405 \ 1406 product(bool, GCOverheadReporting, false, \ 1407 "Enables the GC overhead reporting facility") \ 1408 \ 1409 product(intx, GCOverheadReportingPeriodMS, 100, \ 1410 "Reporting period for conc GC overhead reporting, in ms ") \ 1411 \ 1412 product(bool, CMSIncrementalMode, false, \ 1413 "Whether CMS GC should operate in \"incremental\" mode") \ 1414 \ 1415 product(uintx, CMSIncrementalDutyCycle, 10, \ 1416 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1417 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1418 "value") \ 1419 \ 1420 product(bool, CMSIncrementalPacing, true, \ 1421 "Whether the CMS incremental mode duty cycle should be " \ 1422 "automatically adjusted") \ 1423 \ 1424 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1425 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1426 "enabled (a percentage, 0-100)") \ 1427 \ 1428 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1429 "Percentage (0-100) used to add conservatism when computing the " \ 1430 "duty cycle") \ 1431 \ 1432 product(uintx, CMSIncrementalOffset, 0, \ 1433 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1434 " is shifted to the right within the period between young GCs") \ 1435 \ 1436 product(uintx, CMSExpAvgFactor, 50, \ 1437 "Percentage (0-100) used to weight the current sample when" \ 1438 "computing exponential averages for CMS statistics.") \ 1439 \ 1440 product(uintx, CMS_FLSWeight, 75, \ 1441 "Percentage (0-100) used to weight the current sample when" \ 1442 "computing exponentially decating averages for CMS FLS statistics.") \ 1443 \ 1444 product(uintx, CMS_FLSPadding, 1, \ 1445 "The multiple of deviation from mean to use for buffering" \ 1446 "against volatility in free list demand.") \ 1447 \ 1448 product(uintx, FLSCoalescePolicy, 2, \ 1449 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1450 \ 1451 product(bool, FLSAlwaysCoalesceLarge, false, \ 1452 "CMS: Larger free blocks are always available for coalescing") \ 1453 \ 1454 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1455 "CMS: the smaller the percentage the greater the coalition force")\ 1456 \ 1457 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1458 "CMS: the factor by which to inflate estimated demand of small" \ 1459 " block sizes to prevent coalescing with an adjoining block") \ 1460 \ 1461 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1462 "CMS: the factor by which to inflate estimated demand of large" \ 1463 " block sizes to prevent coalescing with an adjoining block") \ 1464 \ 1465 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1466 "CMS: the factor by which to inflate estimated demand of small" \ 1467 " block sizes to prevent splitting to supply demand for smaller" \ 1468 " blocks") \ 1469 \ 1470 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1471 "CMS: the factor by which to inflate estimated demand of large" \ 1472 " block sizes to prevent splitting to supply demand for smaller" \ 1473 " blocks") \ 1474 \ 1475 product(bool, CMSExtrapolateSweep, false, \ 1476 "CMS: cushion for block demand during sweep") \ 1477 \ 1478 product(uintx, CMS_SweepWeight, 75, \ 1479 "Percentage (0-100) used to weight the current sample when " \ 1480 "computing exponentially decaying average for inter-sweep " \ 1481 "duration") \ 1482 \ 1483 product(uintx, CMS_SweepPadding, 1, \ 1484 "The multiple of deviation from mean to use for buffering " \ 1485 "against volatility in inter-sweep duration.") \ 1486 \ 1487 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1488 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1489 "duration exceeds this threhold in milliseconds") \ 1490 \ 1491 develop(bool, CMSTraceIncrementalMode, false, \ 1492 "Trace CMS incremental mode") \ 1493 \ 1494 develop(bool, CMSTraceIncrementalPacing, false, \ 1495 "Trace CMS incremental mode pacing computation") \ 1496 \ 1497 develop(bool, CMSTraceThreadState, false, \ 1498 "Trace the CMS thread state (enable the trace_state() method)") \ 1499 \ 1500 product(bool, CMSClassUnloadingEnabled, false, \ 1501 "Whether class unloading enabled when using CMS GC") \ 1502 \ 1503 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1504 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1505 " for which classes may not be unloaded") \ 1506 \ 1507 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1508 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1509 \ 1510 product(bool, UseCMSCompactAtFullCollection, true, \ 1511 "Use mark sweep compact at full collections") \ 1512 \ 1513 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1514 "Number of CMS full collection done before compaction if > 0") \ 1515 \ 1516 develop(intx, CMSDictionaryChoice, 0, \ 1517 "Use BinaryTreeDictionary as default in the CMS generation") \ 1518 \ 1519 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1520 "Replenish and indexed free list with this number of chunks") \ 1521 \ 1522 product(bool, CMSReplenishIntermediate, true, \ 1523 "Replenish all intermediate free-list caches") \ 1524 \ 1525 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1526 "When satisfying batched demand, splot blocks from the " \ 1527 "IndexedFreeList whose size is a multiple of requested size") \ 1528 \ 1529 product(bool, CMSLoopWarn, false, \ 1530 "Warn in case of excessive CMS looping") \ 1531 \ 1532 develop(bool, CMSOverflowEarlyRestoration, false, \ 1533 "Whether preserved marks should be restored early") \ 1534 \ 1535 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1536 "Size of marking stack") \ 1537 \ 1538 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1539 "Max size of marking stack") \ 1540 \ 1541 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1542 "Whether we should simulate frequent marking stack / work queue" \ 1543 " overflow") \ 1544 \ 1545 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1546 "An `interval' counter that determines how frequently" \ 1547 " we simulate overflow; a smaller number increases frequency") \ 1548 \ 1549 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1550 "(Temporary, subject to experimentation)" \ 1551 "Maximum number of abortable preclean iterations, if > 0") \ 1552 \ 1553 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1554 "(Temporary, subject to experimentation)" \ 1555 "Maximum time in abortable preclean in ms") \ 1556 \ 1557 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1558 "(Temporary, subject to experimentation)" \ 1559 "Nominal minimum work per abortable preclean iteration") \ 1560 \ 1561 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1562 "(Temporary, subject to experimentation)" \ 1563 " Time that we sleep between iterations when not given" \ 1564 " enough work per iteration") \ 1565 \ 1566 product(uintx, CMSRescanMultiple, 32, \ 1567 "Size (in cards) of CMS parallel rescan task") \ 1568 \ 1569 product(uintx, CMSConcMarkMultiple, 32, \ 1570 "Size (in cards) of CMS concurrent MT marking task") \ 1571 \ 1572 product(uintx, CMSRevisitStackSize, 1*M, \ 1573 "Size of CMS KlassKlass revisit stack") \ 1574 \ 1575 product(bool, CMSAbortSemantics, false, \ 1576 "Whether abort-on-overflow semantics is implemented") \ 1577 \ 1578 product(bool, CMSParallelRemarkEnabled, true, \ 1579 "Whether parallel remark enabled (only if ParNewGC)") \ 1580 \ 1581 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1582 "Whether parallel remark of survivor space" \ 1583 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1584 \ 1585 product(bool, CMSPLABRecordAlways, true, \ 1586 "Whether to always record survivor space PLAB bdries" \ 1587 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1588 \ 1589 product(bool, CMSConcurrentMTEnabled, true, \ 1590 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1591 \ 1592 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1593 "Whether concurrent precleaning enabled in perm gen" \ 1594 " (effective only when CMSPrecleaningEnabled is true)") \ 1595 \ 1596 product(bool, CMSPrecleaningEnabled, true, \ 1597 "Whether concurrent precleaning enabled") \ 1598 \ 1599 product(uintx, CMSPrecleanIter, 3, \ 1600 "Maximum number of precleaning iteration passes") \ 1601 \ 1602 product(uintx, CMSPrecleanNumerator, 2, \ 1603 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1604 " ratio") \ 1605 \ 1606 product(uintx, CMSPrecleanDenominator, 3, \ 1607 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1608 " ratio") \ 1609 \ 1610 product(bool, CMSPrecleanRefLists1, true, \ 1611 "Preclean ref lists during (initial) preclean phase") \ 1612 \ 1613 product(bool, CMSPrecleanRefLists2, false, \ 1614 "Preclean ref lists during abortable preclean phase") \ 1615 \ 1616 product(bool, CMSPrecleanSurvivors1, false, \ 1617 "Preclean survivors during (initial) preclean phase") \ 1618 \ 1619 product(bool, CMSPrecleanSurvivors2, true, \ 1620 "Preclean survivors during abortable preclean phase") \ 1621 \ 1622 product(uintx, CMSPrecleanThreshold, 1000, \ 1623 "Don't re-iterate if #dirty cards less than this") \ 1624 \ 1625 product(bool, CMSCleanOnEnter, true, \ 1626 "Clean-on-enter optimization for reducing number of dirty cards") \ 1627 \ 1628 product(uintx, CMSRemarkVerifyVariant, 1, \ 1629 "Choose variant (1,2) of verification following remark") \ 1630 \ 1631 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1632 "If Eden used is below this value, don't try to schedule remark") \ 1633 \ 1634 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1635 "The Eden occupancy % at which to try and schedule remark pause") \ 1636 \ 1637 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1638 "Start sampling Eden top at least before yg occupancy reaches" \ 1639 " 1/<ratio> of the size at which we plan to schedule remark") \ 1640 \ 1641 product(uintx, CMSSamplingGrain, 16*K, \ 1642 "The minimum distance between eden samples for CMS (see above)") \ 1643 \ 1644 product(bool, CMSScavengeBeforeRemark, false, \ 1645 "Attempt scavenge before the CMS remark step") \ 1646 \ 1647 develop(bool, CMSTraceSweeper, false, \ 1648 "Trace some actions of the CMS sweeper") \ 1649 \ 1650 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1651 "Don't drain below this size per parallel worker/thief") \ 1652 \ 1653 product(intx, CMSWaitDuration, 2000, \ 1654 "Time in milliseconds that CMS thread waits for young GC") \ 1655 \ 1656 product(bool, CMSYield, true, \ 1657 "Yield between steps of concurrent mark & sweep") \ 1658 \ 1659 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1660 "Bitmap operations should process at most this many bits" \ 1661 "between yields") \ 1662 \ 1663 product(bool, CMSDumpAtPromotionFailure, false, \ 1664 "Dump useful information about the state of the CMS old " \ 1665 " generation upon a promotion failure.") \ 1666 \ 1667 product(bool, CMSPrintChunksInDump, false, \ 1668 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1669 " more detailed information about the free chunks.") \ 1670 \ 1671 product(bool, CMSPrintObjectsInDump, false, \ 1672 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1673 " more detailed information about the allocated objects.") \ 1674 \ 1675 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1676 "Verify that all refs across the FLS boundary " \ 1677 " are to valid objects") \ 1678 \ 1679 diagnostic(bool, FLSVerifyLists, false, \ 1680 "Do lots of (expensive) FreeListSpace verification") \ 1681 \ 1682 diagnostic(bool, FLSVerifyIndexTable, false, \ 1683 "Do lots of (expensive) FLS index table verification") \ 1684 \ 1685 develop(bool, FLSVerifyDictionary, false, \ 1686 "Do lots of (expensive) FLS dictionary verification") \ 1687 \ 1688 develop(bool, VerifyBlockOffsetArray, false, \ 1689 "Do (expensive!) block offset array verification") \ 1690 \ 1691 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1692 "Maintain _unallocated_block in BlockOffsetArray" \ 1693 " (currently applicable only to CMS collector)") \ 1694 \ 1695 develop(bool, TraceCMSState, false, \ 1696 "Trace the state of the CMS collection") \ 1697 \ 1698 product(intx, RefDiscoveryPolicy, 0, \ 1699 "Whether reference-based(0) or referent-based(1)") \ 1700 \ 1701 product(bool, ParallelRefProcEnabled, false, \ 1702 "Enable parallel reference processing whenever possible") \ 1703 \ 1704 product(bool, ParallelRefProcBalancingEnabled, true, \ 1705 "Enable balancing of reference processing queues") \ 1706 \ 1707 product(intx, CMSTriggerRatio, 80, \ 1708 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1709 "allocated before a CMS collection cycle commences") \ 1710 \ 1711 product(intx, CMSTriggerPermRatio, 80, \ 1712 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1713 "is allocated before a CMS collection cycle commences, that " \ 1714 "also collects the perm generation") \ 1715 \ 1716 product(uintx, CMSBootstrapOccupancy, 50, \ 1717 "Percentage CMS generation occupancy at which to " \ 1718 "initiate CMS collection for bootstrapping collection stats") \ 1719 \ 1720 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1721 "Percentage CMS generation occupancy to start a CMS collection " \ 1722 "cycle. A negative value means that CMSTriggerRatio is used") \ 1723 \ 1724 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1725 "Percentage of the (entire) heap occupancy to start a " \ 1726 "concurrent GC cycle. It us used by GCs that trigger a " \ 1727 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1728 "not just one of the generations (e.g., G1). A value of 0 " \ 1729 "denotes 'do constant GC cycles'.") \ 1730 \ 1731 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1732 "Percentage CMS perm generation occupancy to start a " \ 1733 "CMScollection cycle. A negative value means that " \ 1734 "CMSTriggerPermRatio is used") \ 1735 \ 1736 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1737 "Only use occupancy as a crierion for starting a CMS collection") \ 1738 \ 1739 product(intx, CMSIsTooFullPercentage, 98, \ 1740 "An absolute ceiling above which CMS will always consider the " \ 1741 "perm gen ripe for collection") \ 1742 \ 1743 develop(bool, CMSTestInFreeList, false, \ 1744 "Check if the coalesced range is already in the " \ 1745 "free lists as claimed") \ 1746 \ 1747 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1748 "Check that all the garbage collected was returned to the " \ 1749 "free lists.") \ 1750 \ 1751 notproduct(bool, ScavengeALot, false, \ 1752 "Force scavenge at every Nth exit from the runtime system " \ 1753 "(N=ScavengeALotInterval)") \ 1754 \ 1755 develop(bool, FullGCALot, false, \ 1756 "Force full gc at every Nth exit from the runtime system " \ 1757 "(N=FullGCALotInterval)") \ 1758 \ 1759 notproduct(bool, GCALotAtAllSafepoints, false, \ 1760 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1761 \ 1762 product(bool, HandlePromotionFailure, true, \ 1763 "The youngest generation collection does not require " \ 1764 "a guarantee of full promotion of all live objects.") \ 1765 \ 1766 product(bool, PrintPromotionFailure, false, \ 1767 "Print additional diagnostic information following " \ 1768 " promotion failure") \ 1769 \ 1770 notproduct(bool, PromotionFailureALot, false, \ 1771 "Use promotion failure handling on every youngest generation " \ 1772 "collection") \ 1773 \ 1774 develop(uintx, PromotionFailureALotCount, 1000, \ 1775 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1776 "refill attempts (ParNew) or promotion attempts " \ 1777 "(other young collectors) ") \ 1778 \ 1779 develop(uintx, PromotionFailureALotInterval, 5, \ 1780 "Total collections between promotion failures alot") \ 1781 \ 1782 develop(intx, WorkStealingSleepMillis, 1, \ 1783 "Sleep time when sleep is used for yields") \ 1784 \ 1785 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1786 "Number of yields before a sleep is done during workstealing") \ 1787 \ 1788 develop(uintx, WorkStealingHardSpins, 4096, \ 1789 "Number of iterations in a spin loop between checks on " \ 1790 "time out of hard spin") \ 1791 \ 1792 develop(uintx, WorkStealingSpinToYieldRatio, 10, \ 1793 "Ratio of hard spins to calls to yield") \ 1794 \ 1795 product(uintx, PreserveMarkStackSize, 1024, \ 1796 "Size for stack used in promotion failure handling") \ 1797 \ 1798 develop(uintx, ObjArrayMarkingStride, 512, \ 1799 "Number of ObjArray elements to push onto the marking stack" \ 1800 "before pushing a continuation entry") \ 1801 \ 1802 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1803 \ 1804 product_pd(bool, ResizeTLAB, \ 1805 "Dynamically resize tlab size for threads") \ 1806 \ 1807 product(bool, ZeroTLAB, false, \ 1808 "Zero out the newly created TLAB") \ 1809 \ 1810 product(bool, FastTLABRefill, true, \ 1811 "Use fast TLAB refill code") \ 1812 \ 1813 product(bool, PrintTLAB, false, \ 1814 "Print various TLAB related information") \ 1815 \ 1816 product(bool, TLABStats, true, \ 1817 "Print various TLAB related information") \ 1818 \ 1819 product(bool, PrintRevisitStats, false, \ 1820 "Print revisit (klass and MDO) stack related information") \ 1821 \ 1822 product_pd(bool, NeverActAsServerClassMachine, \ 1823 "Never act like a server-class machine") \ 1824 \ 1825 product(bool, AlwaysActAsServerClassMachine, false, \ 1826 "Always act like a server-class machine") \ 1827 \ 1828 product_pd(uint64_t, MaxRAM, \ 1829 "Real memory size (in bytes) used to set maximum heap size") \ 1830 \ 1831 product(uintx, ErgoHeapSizeLimit, 0, \ 1832 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1833 "MaxRAM / MaxRAMFraction") \ 1834 \ 1835 product(uintx, MaxRAMFraction, 4, \ 1836 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1837 "size") \ 1838 \ 1839 product(uintx, DefaultMaxRAMFraction, 4, \ 1840 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1841 "size; deprecated: to be renamed to MaxRAMFraction") \ 1842 \ 1843 product(uintx, MinRAMFraction, 2, \ 1844 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1845 "size on systems with small physical memory size") \ 1846 \ 1847 product(uintx, InitialRAMFraction, 64, \ 1848 "Fraction (1/n) of real memory used for initial heap size") \ 1849 \ 1850 product(bool, UseAutoGCSelectPolicy, false, \ 1851 "Use automatic collection selection policy") \ 1852 \ 1853 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1854 "Automatic GC selection pause threshhold in ms") \ 1855 \ 1856 product(bool, UseAdaptiveSizePolicy, true, \ 1857 "Use adaptive generation sizing policies") \ 1858 \ 1859 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1860 "Use adaptive survivor sizing policies") \ 1861 \ 1862 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1863 "Use adaptive young-old sizing policies at minor collections") \ 1864 \ 1865 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1866 "Use adaptive young-old sizing policies at major collections") \ 1867 \ 1868 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1869 "Use statistics from System.GC for adaptive size policy") \ 1870 \ 1871 product(bool, UseAdaptiveGCBoundary, false, \ 1872 "Allow young-old boundary to move") \ 1873 \ 1874 develop(bool, TraceAdaptiveGCBoundary, false, \ 1875 "Trace young-old boundary moves") \ 1876 \ 1877 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1878 "Resize the virtual spaces of the young or old generations") \ 1879 \ 1880 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1881 "Policy for changeing generation size for throughput goals") \ 1882 \ 1883 product(uintx, AdaptiveSizePausePolicy, 0, \ 1884 "Policy for changing generation size for pause goals") \ 1885 \ 1886 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1887 "Adjust tenured generation to achive a minor pause goal") \ 1888 \ 1889 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1890 "Adjust young generation to achive a major pause goal") \ 1891 \ 1892 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1893 "Number of steps where heuristics is used before data is used") \ 1894 \ 1895 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1896 "Number of collections before the adaptive sizing is started") \ 1897 \ 1898 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1899 "Collecton interval for printing information; zero => never") \ 1900 \ 1901 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1902 "Use adaptive minimum footprint as a goal") \ 1903 \ 1904 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1905 "Weight given to exponential resizing, between 0 and 100") \ 1906 \ 1907 product(uintx, AdaptiveTimeWeight, 25, \ 1908 "Weight given to time in adaptive policy, between 0 and 100") \ 1909 \ 1910 product(uintx, PausePadding, 1, \ 1911 "How much buffer to keep for pause time") \ 1912 \ 1913 product(uintx, PromotedPadding, 3, \ 1914 "How much buffer to keep for promotion failure") \ 1915 \ 1916 product(uintx, SurvivorPadding, 3, \ 1917 "How much buffer to keep for survivor overflow") \ 1918 \ 1919 product(uintx, AdaptivePermSizeWeight, 20, \ 1920 "Weight for perm gen exponential resizing, between 0 and 100") \ 1921 \ 1922 product(uintx, PermGenPadding, 3, \ 1923 "How much buffer to keep for perm gen sizing") \ 1924 \ 1925 product(uintx, ThresholdTolerance, 10, \ 1926 "Allowed collection cost difference between generations") \ 1927 \ 1928 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1929 "If collection costs are within margin, reduce both by full " \ 1930 "delta") \ 1931 \ 1932 product(uintx, YoungGenerationSizeIncrement, 20, \ 1933 "Adaptive size percentage change in young generation") \ 1934 \ 1935 product(uintx, YoungGenerationSizeSupplement, 80, \ 1936 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1937 \ 1938 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1939 "Decay factor to YoungedGenerationSizeSupplement") \ 1940 \ 1941 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1942 "Adaptive size percentage change in tenured generation") \ 1943 \ 1944 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1945 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1946 \ 1947 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1948 "Decay factor to TenuredGenerationSizeIncrement") \ 1949 \ 1950 product(uintx, MaxGCPauseMillis, max_uintx, \ 1951 "Adaptive size policy maximum GC pause time goal in msec, " \ 1952 "or (G1 Only) the max. GC time per MMU time slice") \ 1953 \ 1954 product(intx, GCPauseIntervalMillis, 500, \ 1955 "Time slice for MMU specification") \ 1956 \ 1957 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1958 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1959 \ 1960 product(uintx, GCTimeRatio, 99, \ 1961 "Adaptive size policy application time to GC time ratio") \ 1962 \ 1963 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1964 "Adaptive size scale down factor for shrinking") \ 1965 \ 1966 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1967 "Adaptive size decays the major cost for long major intervals") \ 1968 \ 1969 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1970 "Time scale over which major costs decay") \ 1971 \ 1972 product(uintx, MinSurvivorRatio, 3, \ 1973 "Minimum ratio of young generation/survivor space size") \ 1974 \ 1975 product(uintx, InitialSurvivorRatio, 8, \ 1976 "Initial ratio of eden/survivor space size") \ 1977 \ 1978 product(uintx, BaseFootPrintEstimate, 256*M, \ 1979 "Estimate of footprint other than Java Heap") \ 1980 \ 1981 product(bool, UseGCOverheadLimit, true, \ 1982 "Use policy to limit of proportion of time spent in GC " \ 1983 "before an OutOfMemory error is thrown") \ 1984 \ 1985 product(uintx, GCTimeLimit, 98, \ 1986 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1987 "error is thrown (used with GCHeapFreeLimit)") \ 1988 \ 1989 product(uintx, GCHeapFreeLimit, 2, \ 1990 "Minimum percentage of free space after a full GC before an " \ 1991 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1992 \ 1993 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 1994 "Number of consecutive collections before gc time limit fires") \ 1995 \ 1996 product(bool, PrintAdaptiveSizePolicy, false, \ 1997 "Print information about AdaptiveSizePolicy") \ 1998 \ 1999 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2000 "How far ahead to prefetch destination area (<= 0 means off)") \ 2001 \ 2002 product(intx, PrefetchScanIntervalInBytes, -1, \ 2003 "How far ahead to prefetch scan area (<= 0 means off)") \ 2004 \ 2005 product(intx, PrefetchFieldsAhead, -1, \ 2006 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2007 \ 2008 develop(bool, UsePrefetchQueue, true, \ 2009 "Use the prefetch queue during PS promotion") \ 2010 \ 2011 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2012 "Verify system before exiting") \ 2013 \ 2014 diagnostic(bool, VerifyBeforeGC, false, \ 2015 "Verify memory system before GC") \ 2016 \ 2017 diagnostic(bool, VerifyAfterGC, false, \ 2018 "Verify memory system after GC") \ 2019 \ 2020 diagnostic(bool, VerifyDuringGC, false, \ 2021 "Verify memory system during GC (between phases)") \ 2022 \ 2023 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2024 "Enable parallel memory system verification") \ 2025 \ 2026 diagnostic(bool, DeferInitialCardMark, false, \ 2027 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2028 "may arise from new_pre_store_barrier") \ 2029 \ 2030 diagnostic(bool, VerifyRememberedSets, false, \ 2031 "Verify GC remembered sets") \ 2032 \ 2033 diagnostic(bool, VerifyObjectStartArray, true, \ 2034 "Verify GC object start array if verify before/after") \ 2035 \ 2036 product(bool, DisableExplicitGC, false, \ 2037 "Tells whether calling System.gc() does a full GC") \ 2038 \ 2039 notproduct(bool, CheckMemoryInitialization, false, \ 2040 "Checks memory initialization") \ 2041 \ 2042 product(bool, CollectGen0First, false, \ 2043 "Collect youngest generation before each full GC") \ 2044 \ 2045 diagnostic(bool, BindCMSThreadToCPU, false, \ 2046 "Bind CMS Thread to CPU if possible") \ 2047 \ 2048 diagnostic(uintx, CPUForCMSThread, 0, \ 2049 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2050 \ 2051 product(bool, BindGCTaskThreadsToCPUs, false, \ 2052 "Bind GCTaskThreads to CPUs if possible") \ 2053 \ 2054 product(bool, UseGCTaskAffinity, false, \ 2055 "Use worker affinity when asking for GCTasks") \ 2056 \ 2057 product(uintx, ProcessDistributionStride, 4, \ 2058 "Stride through processors when distributing processes") \ 2059 \ 2060 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2061 "number of times the coordinator GC thread will sleep while " \ 2062 "yielding before giving up and resuming GC") \ 2063 \ 2064 product(uintx, CMSYieldSleepCount, 0, \ 2065 "number of times a GC thread (minus the coordinator) " \ 2066 "will sleep while yielding before giving up and resuming GC") \ 2067 \ 2068 /* gc tracing */ \ 2069 manageable(bool, PrintGC, false, \ 2070 "Print message at garbage collect") \ 2071 \ 2072 manageable(bool, PrintGCDetails, false, \ 2073 "Print more details at garbage collect") \ 2074 \ 2075 manageable(bool, PrintGCDateStamps, false, \ 2076 "Print date stamps at garbage collect") \ 2077 \ 2078 manageable(bool, PrintGCTimeStamps, false, \ 2079 "Print timestamps at garbage collect") \ 2080 \ 2081 product(bool, PrintGCTaskTimeStamps, false, \ 2082 "Print timestamps for individual gc worker thread tasks") \ 2083 \ 2084 develop(intx, ConcGCYieldTimeout, 0, \ 2085 "If non-zero, assert that GC threads yield within this # of ms.") \ 2086 \ 2087 notproduct(bool, TraceMarkSweep, false, \ 2088 "Trace mark sweep") \ 2089 \ 2090 product(bool, PrintReferenceGC, false, \ 2091 "Print times spent handling reference objects during GC " \ 2092 " (enabled only when PrintGCDetails)") \ 2093 \ 2094 develop(bool, TraceReferenceGC, false, \ 2095 "Trace handling of soft/weak/final/phantom references") \ 2096 \ 2097 develop(bool, TraceFinalizerRegistration, false, \ 2098 "Trace registration of final references") \ 2099 \ 2100 notproduct(bool, TraceScavenge, false, \ 2101 "Trace scavenge") \ 2102 \ 2103 product_rw(bool, TraceClassLoading, false, \ 2104 "Trace all classes loaded") \ 2105 \ 2106 product(bool, TraceClassLoadingPreorder, false, \ 2107 "Trace all classes loaded in order referenced (not loaded)") \ 2108 \ 2109 product_rw(bool, TraceClassUnloading, false, \ 2110 "Trace unloading of classes") \ 2111 \ 2112 product_rw(bool, TraceLoaderConstraints, false, \ 2113 "Trace loader constraints") \ 2114 \ 2115 product(bool, TraceGen0Time, false, \ 2116 "Trace accumulated time for Gen 0 collection") \ 2117 \ 2118 product(bool, TraceGen1Time, false, \ 2119 "Trace accumulated time for Gen 1 collection") \ 2120 \ 2121 product(bool, PrintTenuringDistribution, false, \ 2122 "Print tenuring age information") \ 2123 \ 2124 product_rw(bool, PrintHeapAtGC, false, \ 2125 "Print heap layout before and after each GC") \ 2126 \ 2127 product_rw(bool, PrintHeapAtGCExtended, false, \ 2128 "Prints extended information about the layout of the heap " \ 2129 "when -XX:+PrintHeapAtGC is set") \ 2130 \ 2131 product(bool, PrintHeapAtSIGBREAK, true, \ 2132 "Print heap layout in response to SIGBREAK") \ 2133 \ 2134 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2135 "Print a class histogram before any major stop-world GC") \ 2136 \ 2137 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2138 "Print a class histogram after any major stop-world GC") \ 2139 \ 2140 manageable(bool, PrintClassHistogram, false, \ 2141 "Print a histogram of class instances") \ 2142 \ 2143 develop(bool, TraceWorkGang, false, \ 2144 "Trace activities of work gangs") \ 2145 \ 2146 product(bool, TraceParallelOldGCTasks, false, \ 2147 "Trace multithreaded GC activity") \ 2148 \ 2149 develop(bool, TraceBlockOffsetTable, false, \ 2150 "Print BlockOffsetTable maps") \ 2151 \ 2152 develop(bool, TraceCardTableModRefBS, false, \ 2153 "Print CardTableModRefBS maps") \ 2154 \ 2155 develop(bool, TraceGCTaskManager, false, \ 2156 "Trace actions of the GC task manager") \ 2157 \ 2158 develop(bool, TraceGCTaskQueue, false, \ 2159 "Trace actions of the GC task queues") \ 2160 \ 2161 develop(bool, TraceGCTaskThread, false, \ 2162 "Trace actions of the GC task threads") \ 2163 \ 2164 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2165 "Print the time taken by each parallel old gc phase." \ 2166 "PrintGCDetails must also be enabled.") \ 2167 \ 2168 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2169 "Trace parallel old gc marking phase") \ 2170 \ 2171 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2172 "Trace parallel old gc summary phase") \ 2173 \ 2174 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2175 "Trace parallel old gc compaction phase") \ 2176 \ 2177 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2178 "Trace parallel old gc dense prefix computation") \ 2179 \ 2180 develop(bool, IgnoreLibthreadGPFault, false, \ 2181 "Suppress workaround for libthread GP fault") \ 2182 \ 2183 product(bool, PrintJNIGCStalls, false, \ 2184 "Print diagnostic message when GC is stalled" \ 2185 "by JNI critical section") \ 2186 \ 2187 /* JVMTI heap profiling */ \ 2188 \ 2189 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2190 "Trace JVMTI object tagging calls") \ 2191 \ 2192 diagnostic(bool, VerifyBeforeIteration, false, \ 2193 "Verify memory system before JVMTI iteration") \ 2194 \ 2195 /* compiler interface */ \ 2196 \ 2197 develop(bool, CIPrintCompilerName, false, \ 2198 "when CIPrint is active, print the name of the active compiler") \ 2199 \ 2200 develop(bool, CIPrintCompileQueue, false, \ 2201 "display the contents of the compile queue whenever a " \ 2202 "compilation is enqueued") \ 2203 \ 2204 develop(bool, CIPrintRequests, false, \ 2205 "display every request for compilation") \ 2206 \ 2207 product(bool, CITime, false, \ 2208 "collect timing information for compilation") \ 2209 \ 2210 develop(bool, CITimeEach, false, \ 2211 "display timing information after each successful compilation") \ 2212 \ 2213 develop(bool, CICountOSR, true, \ 2214 "use a separate counter when assigning ids to osr compilations") \ 2215 \ 2216 develop(bool, CICompileNatives, true, \ 2217 "compile native methods if supported by the compiler") \ 2218 \ 2219 develop_pd(bool, CICompileOSR, \ 2220 "compile on stack replacement methods if supported by the " \ 2221 "compiler") \ 2222 \ 2223 develop(bool, CIPrintMethodCodes, false, \ 2224 "print method bytecodes of the compiled code") \ 2225 \ 2226 develop(bool, CIPrintTypeFlow, false, \ 2227 "print the results of ciTypeFlow analysis") \ 2228 \ 2229 develop(bool, CITraceTypeFlow, false, \ 2230 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2231 \ 2232 develop(intx, CICloneLoopTestLimit, 100, \ 2233 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2234 \ 2235 /* temp diagnostics */ \ 2236 \ 2237 diagnostic(bool, TraceRedundantCompiles, false, \ 2238 "Have compile broker print when a request already in the queue is"\ 2239 " requested again") \ 2240 \ 2241 diagnostic(bool, InitialCompileFast, false, \ 2242 "Initial compile at CompLevel_fast_compile") \ 2243 \ 2244 diagnostic(bool, InitialCompileReallyFast, false, \ 2245 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2246 \ 2247 diagnostic(bool, FullProfileOnReInterpret, true, \ 2248 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2249 \ 2250 /* compiler */ \ 2251 \ 2252 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2253 "Number of compiler threads to run") \ 2254 \ 2255 product(intx, CompilationPolicyChoice, 0, \ 2256 "which compilation policy (0/1)") \ 2257 \ 2258 develop(bool, UseStackBanging, true, \ 2259 "use stack banging for stack overflow checks (required for " \ 2260 "proper StackOverflow handling; disable only to measure cost " \ 2261 "of stackbanging)") \ 2262 \ 2263 develop(bool, Use24BitFPMode, true, \ 2264 "Set 24-bit FPU mode on a per-compile basis ") \ 2265 \ 2266 develop(bool, Use24BitFP, true, \ 2267 "use FP instructions that produce 24-bit precise results") \ 2268 \ 2269 develop(bool, UseStrictFP, true, \ 2270 "use strict fp if modifier strictfp is set") \ 2271 \ 2272 develop(bool, GenerateSynchronizationCode, true, \ 2273 "generate locking/unlocking code for synchronized methods and " \ 2274 "monitors") \ 2275 \ 2276 develop(bool, GenerateCompilerNullChecks, true, \ 2277 "Generate explicit null checks for loads/stores/calls") \ 2278 \ 2279 develop(bool, GenerateRangeChecks, true, \ 2280 "Generate range checks for array accesses") \ 2281 \ 2282 develop_pd(bool, ImplicitNullChecks, \ 2283 "generate code for implicit null checks") \ 2284 \ 2285 product(bool, PrintSafepointStatistics, false, \ 2286 "print statistics about safepoint synchronization") \ 2287 \ 2288 product(intx, PrintSafepointStatisticsCount, 300, \ 2289 "total number of safepoint statistics collected " \ 2290 "before printing them out") \ 2291 \ 2292 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2293 "print safepoint statistics only when safepoint takes" \ 2294 " more than PrintSafepointSatisticsTimeout in millis") \ 2295 \ 2296 develop(bool, InlineAccessors, true, \ 2297 "inline accessor methods (get/set)") \ 2298 \ 2299 product(bool, Inline, true, \ 2300 "enable inlining") \ 2301 \ 2302 product(bool, ClipInlining, true, \ 2303 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2304 \ 2305 develop(bool, UseCHA, true, \ 2306 "enable CHA") \ 2307 \ 2308 product(bool, UseTypeProfile, true, \ 2309 "Check interpreter profile for historically monomorphic calls") \ 2310 \ 2311 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2312 "% of major receiver type to all profiled receivers") \ 2313 \ 2314 notproduct(bool, TimeCompiler, false, \ 2315 "time the compiler") \ 2316 \ 2317 notproduct(bool, TimeCompiler2, false, \ 2318 "detailed time the compiler (requires +TimeCompiler)") \ 2319 \ 2320 diagnostic(bool, PrintInlining, false, \ 2321 "prints inlining optimizations") \ 2322 \ 2323 diagnostic(bool, PrintIntrinsics, false, \ 2324 "prints attempted and successful inlining of intrinsics") \ 2325 \ 2326 product(bool, UseCountLeadingZerosInstruction, false, \ 2327 "Use count leading zeros instruction") \ 2328 \ 2329 product(bool, UsePopCountInstruction, false, \ 2330 "Use population count instruction") \ 2331 \ 2332 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2333 "do not expand intrinsics whose (internal) names appear here") \ 2334 \ 2335 develop(bool, StressReflectiveCode, false, \ 2336 "Use inexact types at allocations, etc., to test reflection") \ 2337 \ 2338 develop(bool, EagerInitialization, false, \ 2339 "Eagerly initialize classes if possible") \ 2340 \ 2341 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2342 "Update methodDataOops in Tier1-generated code") \ 2343 \ 2344 develop(bool, TraceMethodReplacement, false, \ 2345 "Print when methods are replaced do to recompilation") \ 2346 \ 2347 develop(bool, PrintMethodFlushing, false, \ 2348 "print the nmethods being flushed") \ 2349 \ 2350 notproduct(bool, LogMultipleMutexLocking, false, \ 2351 "log locking and unlocking of mutexes (only if multiple locks " \ 2352 "are held)") \ 2353 \ 2354 develop(bool, UseRelocIndex, false, \ 2355 "use an index to speed random access to relocations") \ 2356 \ 2357 develop(bool, StressCodeBuffers, false, \ 2358 "Exercise code buffer expansion and other rare state changes") \ 2359 \ 2360 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2361 "Generate extra debugging info for non-safepoints in nmethods") \ 2362 \ 2363 diagnostic(bool, DebugInlinedCalls, true, \ 2364 "If false, restricts profiled locations to the root method only") \ 2365 \ 2366 product(bool, PrintVMOptions, trueInDebug, \ 2367 "Print flags that appeared on the command line") \ 2368 \ 2369 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2370 "Ignore unrecognized VM options") \ 2371 \ 2372 product(bool, PrintCommandLineFlags, false, \ 2373 "Print flags specified on command line or set by ergonomics") \ 2374 \ 2375 product(bool, PrintFlagsInitial, false, \ 2376 "Print all VM flags before argument processing and exit VM") \ 2377 \ 2378 product(bool, PrintFlagsFinal, false, \ 2379 "Print all VM flags after argument and ergonomic processing") \ 2380 \ 2381 diagnostic(bool, SerializeVMOutput, true, \ 2382 "Use a mutex to serialize output to tty and hotspot.log") \ 2383 \ 2384 diagnostic(bool, DisplayVMOutput, true, \ 2385 "Display all VM output on the tty, independently of LogVMOutput") \ 2386 \ 2387 diagnostic(bool, LogVMOutput, trueInDebug, \ 2388 "Save VM output to hotspot.log, or to LogFile") \ 2389 \ 2390 diagnostic(ccstr, LogFile, NULL, \ 2391 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2392 \ 2393 product(ccstr, ErrorFile, NULL, \ 2394 "If an error occurs, save the error data to this file " \ 2395 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2396 \ 2397 product(bool, DisplayVMOutputToStderr, false, \ 2398 "If DisplayVMOutput is true, display all VM output to stderr") \ 2399 \ 2400 product(bool, DisplayVMOutputToStdout, false, \ 2401 "If DisplayVMOutput is true, display all VM output to stdout") \ 2402 \ 2403 product(bool, UseHeavyMonitors, false, \ 2404 "use heavyweight instead of lightweight Java monitors") \ 2405 \ 2406 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2407 "print histogram of the symbol table") \ 2408 \ 2409 notproduct(bool, ExitVMOnVerifyError, false, \ 2410 "standard exit from VM if bytecode verify error " \ 2411 "(only in debug mode)") \ 2412 \ 2413 notproduct(ccstr, AbortVMOnException, NULL, \ 2414 "Call fatal if this exception is thrown. Example: " \ 2415 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2416 \ 2417 develop(bool, DebugVtables, false, \ 2418 "add debugging code to vtable dispatch") \ 2419 \ 2420 develop(bool, PrintVtables, false, \ 2421 "print vtables when printing klass") \ 2422 \ 2423 notproduct(bool, PrintVtableStats, false, \ 2424 "print vtables stats at end of run") \ 2425 \ 2426 develop(bool, TraceCreateZombies, false, \ 2427 "trace creation of zombie nmethods") \ 2428 \ 2429 notproduct(bool, IgnoreLockingAssertions, false, \ 2430 "disable locking assertions (for speed)") \ 2431 \ 2432 notproduct(bool, VerifyLoopOptimizations, false, \ 2433 "verify major loop optimizations") \ 2434 \ 2435 product(bool, RangeCheckElimination, true, \ 2436 "Split loop iterations to eliminate range checks") \ 2437 \ 2438 develop_pd(bool, UncommonNullCast, \ 2439 "track occurrences of null in casts; adjust compiler tactics") \ 2440 \ 2441 develop(bool, TypeProfileCasts, true, \ 2442 "treat casts like calls for purposes of type profiling") \ 2443 \ 2444 develop(bool, MonomorphicArrayCheck, true, \ 2445 "Uncommon-trap array store checks that require full type check") \ 2446 \ 2447 develop(bool, DelayCompilationDuringStartup, true, \ 2448 "Delay invoking the compiler until main application class is " \ 2449 "loaded") \ 2450 \ 2451 develop(bool, CompileTheWorld, false, \ 2452 "Compile all methods in all classes in bootstrap class path " \ 2453 "(stress test)") \ 2454 \ 2455 develop(bool, CompileTheWorldPreloadClasses, true, \ 2456 "Preload all classes used by a class before start loading") \ 2457 \ 2458 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2459 "Compile all methods although class initializer failed") \ 2460 \ 2461 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2462 "Force a safepoint every n compiles so sweeper can keep up") \ 2463 \ 2464 develop(bool, TraceIterativeGVN, false, \ 2465 "Print progress during Iterative Global Value Numbering") \ 2466 \ 2467 develop(bool, FillDelaySlots, true, \ 2468 "Fill delay slots (on SPARC only)") \ 2469 \ 2470 develop(bool, VerifyIterativeGVN, false, \ 2471 "Verify Def-Use modifications during sparse Iterative Global " \ 2472 "Value Numbering") \ 2473 \ 2474 notproduct(bool, TracePhaseCCP, false, \ 2475 "Print progress during Conditional Constant Propagation") \ 2476 \ 2477 develop(bool, TimeLivenessAnalysis, false, \ 2478 "Time computation of bytecode liveness analysis") \ 2479 \ 2480 develop(bool, TraceLivenessGen, false, \ 2481 "Trace the generation of liveness analysis information") \ 2482 \ 2483 notproduct(bool, TraceLivenessQuery, false, \ 2484 "Trace queries of liveness analysis information") \ 2485 \ 2486 notproduct(bool, CollectIndexSetStatistics, false, \ 2487 "Collect information about IndexSets") \ 2488 \ 2489 develop(bool, PrintDominators, false, \ 2490 "Print out dominator trees for GVN") \ 2491 \ 2492 develop(bool, UseLoopSafepoints, true, \ 2493 "Generate Safepoint nodes in every loop") \ 2494 \ 2495 notproduct(bool, TraceCISCSpill, false, \ 2496 "Trace allocators use of cisc spillable instructions") \ 2497 \ 2498 notproduct(bool, TraceSpilling, false, \ 2499 "Trace spilling") \ 2500 \ 2501 develop(bool, DeutschShiffmanExceptions, true, \ 2502 "Fast check to find exception handler for precisely typed " \ 2503 "exceptions") \ 2504 \ 2505 product(bool, SplitIfBlocks, true, \ 2506 "Clone compares and control flow through merge points to fold " \ 2507 "some branches") \ 2508 \ 2509 develop(intx, FastAllocateSizeLimit, 128*K, \ 2510 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2511 "Inline allocations larger than this in doublewords must go slow")\ 2512 \ 2513 product(bool, AggressiveOpts, false, \ 2514 "Enable aggressive optimizations - see arguments.cpp") \ 2515 \ 2516 product(bool, UseStringCache, false, \ 2517 "Enable String cache capabilities on String.java") \ 2518 \ 2519 /* statistics */ \ 2520 develop(bool, UseVTune, false, \ 2521 "enable support for Intel's VTune profiler") \ 2522 \ 2523 develop(bool, CountCompiledCalls, false, \ 2524 "counts method invocations") \ 2525 \ 2526 notproduct(bool, CountRuntimeCalls, false, \ 2527 "counts VM runtime calls") \ 2528 \ 2529 develop(bool, CountJNICalls, false, \ 2530 "counts jni method invocations") \ 2531 \ 2532 notproduct(bool, CountJVMCalls, false, \ 2533 "counts jvm method invocations") \ 2534 \ 2535 notproduct(bool, CountRemovableExceptions, false, \ 2536 "count exceptions that could be replaced by branches due to " \ 2537 "inlining") \ 2538 \ 2539 notproduct(bool, ICMissHistogram, false, \ 2540 "produce histogram of IC misses") \ 2541 \ 2542 notproduct(bool, PrintClassStatistics, false, \ 2543 "prints class statistics at end of run") \ 2544 \ 2545 notproduct(bool, PrintMethodStatistics, false, \ 2546 "prints method statistics at end of run") \ 2547 \ 2548 /* interpreter */ \ 2549 develop(bool, ClearInterpreterLocals, false, \ 2550 "Always clear local variables of interpreter activations upon " \ 2551 "entry") \ 2552 \ 2553 product_pd(bool, RewriteBytecodes, \ 2554 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2555 \ 2556 product_pd(bool, RewriteFrequentPairs, \ 2557 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2558 \ 2559 diagnostic(bool, PrintInterpreter, false, \ 2560 "Prints the generated interpreter code") \ 2561 \ 2562 product(bool, UseInterpreter, true, \ 2563 "Use interpreter for non-compiled methods") \ 2564 \ 2565 develop(bool, UseFastSignatureHandlers, true, \ 2566 "Use fast signature handlers for native calls") \ 2567 \ 2568 develop(bool, UseV8InstrsOnly, false, \ 2569 "Use SPARC-V8 Compliant instruction subset") \ 2570 \ 2571 product(bool, UseNiagaraInstrs, false, \ 2572 "Use Niagara-efficient instruction subset") \ 2573 \ 2574 develop(bool, UseCASForSwap, false, \ 2575 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2576 \ 2577 product(bool, UseLoopCounter, true, \ 2578 "Increment invocation counter on backward branch") \ 2579 \ 2580 product(bool, UseFastEmptyMethods, true, \ 2581 "Use fast method entry code for empty methods") \ 2582 \ 2583 product(bool, UseFastAccessorMethods, true, \ 2584 "Use fast method entry code for accessor methods") \ 2585 \ 2586 product_pd(bool, UseOnStackReplacement, \ 2587 "Use on stack replacement, calls runtime if invoc. counter " \ 2588 "overflows in loop") \ 2589 \ 2590 notproduct(bool, TraceOnStackReplacement, false, \ 2591 "Trace on stack replacement") \ 2592 \ 2593 develop(bool, PoisonOSREntry, true, \ 2594 "Detect abnormal calls to OSR code") \ 2595 \ 2596 product_pd(bool, PreferInterpreterNativeStubs, \ 2597 "Use always interpreter stubs for native methods invoked via " \ 2598 "interpreter") \ 2599 \ 2600 develop(bool, CountBytecodes, false, \ 2601 "Count number of bytecodes executed") \ 2602 \ 2603 develop(bool, PrintBytecodeHistogram, false, \ 2604 "Print histogram of the executed bytecodes") \ 2605 \ 2606 develop(bool, PrintBytecodePairHistogram, false, \ 2607 "Print histogram of the executed bytecode pairs") \ 2608 \ 2609 diagnostic(bool, PrintSignatureHandlers, false, \ 2610 "Print code generated for native method signature handlers") \ 2611 \ 2612 develop(bool, VerifyOops, false, \ 2613 "Do plausibility checks for oops") \ 2614 \ 2615 develop(bool, CheckUnhandledOops, false, \ 2616 "Check for unhandled oops in VM code") \ 2617 \ 2618 develop(bool, VerifyJNIFields, trueInDebug, \ 2619 "Verify jfieldIDs for instance fields") \ 2620 \ 2621 notproduct(bool, VerifyJNIEnvThread, false, \ 2622 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2623 "from JNI") \ 2624 \ 2625 develop(bool, VerifyFPU, false, \ 2626 "Verify FPU state (check for NaN's, etc.)") \ 2627 \ 2628 develop(bool, VerifyThread, false, \ 2629 "Watch the thread register for corruption (SPARC only)") \ 2630 \ 2631 develop(bool, VerifyActivationFrameSize, false, \ 2632 "Verify that activation frame didn't become smaller than its " \ 2633 "minimal size") \ 2634 \ 2635 develop(bool, TraceFrequencyInlining, false, \ 2636 "Trace frequency based inlining") \ 2637 \ 2638 notproduct(bool, TraceTypeProfile, false, \ 2639 "Trace type profile") \ 2640 \ 2641 develop_pd(bool, InlineIntrinsics, \ 2642 "Inline intrinsics that can be statically resolved") \ 2643 \ 2644 product_pd(bool, ProfileInterpreter, \ 2645 "Profile at the bytecode level during interpretation") \ 2646 \ 2647 develop_pd(bool, ProfileTraps, \ 2648 "Profile deoptimization traps at the bytecode level") \ 2649 \ 2650 product(intx, ProfileMaturityPercentage, 20, \ 2651 "number of method invocations/branches (expressed as % of " \ 2652 "CompileThreshold) before using the method's profile") \ 2653 \ 2654 develop(bool, PrintMethodData, false, \ 2655 "Print the results of +ProfileInterpreter at end of run") \ 2656 \ 2657 develop(bool, VerifyDataPointer, trueInDebug, \ 2658 "Verify the method data pointer during interpreter profiling") \ 2659 \ 2660 develop(bool, VerifyCompiledCode, false, \ 2661 "Include miscellaneous runtime verifications in nmethod code; " \ 2662 "default off because it disturbs nmethod size heuristics") \ 2663 \ 2664 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2665 "Manually make GC thread crash then dump java stack trace; " \ 2666 "Test only") \ 2667 \ 2668 /* compilation */ \ 2669 product(bool, UseCompiler, true, \ 2670 "use compilation") \ 2671 \ 2672 develop(bool, TraceCompilationPolicy, false, \ 2673 "Trace compilation policy") \ 2674 \ 2675 develop(bool, TimeCompilationPolicy, false, \ 2676 "Time the compilation policy") \ 2677 \ 2678 product(bool, UseCounterDecay, true, \ 2679 "adjust recompilation counters") \ 2680 \ 2681 develop(intx, CounterHalfLifeTime, 30, \ 2682 "half-life time of invocation counters (in secs)") \ 2683 \ 2684 develop(intx, CounterDecayMinIntervalLength, 500, \ 2685 "Min. ms. between invocation of CounterDecay") \ 2686 \ 2687 product(bool, AlwaysCompileLoopMethods, false, \ 2688 "when using recompilation, never interpret methods " \ 2689 "containing loops") \ 2690 \ 2691 product(bool, DontCompileHugeMethods, true, \ 2692 "don't compile methods > HugeMethodLimit") \ 2693 \ 2694 /* Bytecode escape analysis estimation. */ \ 2695 product(bool, EstimateArgEscape, true, \ 2696 "Analyze bytecodes to estimate escape state of arguments") \ 2697 \ 2698 product(intx, BCEATraceLevel, 0, \ 2699 "How much tracing to do of bytecode escape analysis estimates") \ 2700 \ 2701 product(intx, MaxBCEAEstimateLevel, 5, \ 2702 "Maximum number of nested calls that are analyzed by BC EA.") \ 2703 \ 2704 product(intx, MaxBCEAEstimateSize, 150, \ 2705 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2706 \ 2707 product(intx, AllocatePrefetchStyle, 1, \ 2708 "0 = no prefetch, " \ 2709 "1 = prefetch instructions for each allocation, " \ 2710 "2 = use TLAB watermark to gate allocation prefetch") \ 2711 \ 2712 product(intx, AllocatePrefetchDistance, -1, \ 2713 "Distance to prefetch ahead of allocation pointer") \ 2714 \ 2715 product(intx, AllocatePrefetchLines, 1, \ 2716 "Number of lines to prefetch ahead of allocation pointer") \ 2717 \ 2718 product(intx, AllocatePrefetchStepSize, 16, \ 2719 "Step size in bytes of sequential prefetch instructions") \ 2720 \ 2721 product(intx, AllocatePrefetchInstr, 0, \ 2722 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2723 \ 2724 product(intx, ReadPrefetchInstr, 0, \ 2725 "Prefetch instruction to prefetch ahead") \ 2726 \ 2727 /* deoptimization */ \ 2728 develop(bool, TraceDeoptimization, false, \ 2729 "Trace deoptimization") \ 2730 \ 2731 develop(bool, DebugDeoptimization, false, \ 2732 "Tracing various information while debugging deoptimization") \ 2733 \ 2734 product(intx, SelfDestructTimer, 0, \ 2735 "Will cause VM to terminate after a given time (in minutes) " \ 2736 "(0 means off)") \ 2737 \ 2738 product(intx, MaxJavaStackTraceDepth, 1024, \ 2739 "Max. no. of lines in the stack trace for Java exceptions " \ 2740 "(0 means all)") \ 2741 \ 2742 develop(intx, GuaranteedSafepointInterval, 1000, \ 2743 "Guarantee a safepoint (at least) every so many milliseconds " \ 2744 "(0 means none)") \ 2745 \ 2746 product(intx, SafepointTimeoutDelay, 10000, \ 2747 "Delay in milliseconds for option SafepointTimeout") \ 2748 \ 2749 product(intx, NmethodSweepFraction, 4, \ 2750 "Number of invocations of sweeper to cover all nmethods") \ 2751 \ 2752 notproduct(intx, MemProfilingInterval, 500, \ 2753 "Time between each invocation of the MemProfiler") \ 2754 \ 2755 develop(intx, MallocCatchPtr, -1, \ 2756 "Hit breakpoint when mallocing/freeing this pointer") \ 2757 \ 2758 notproduct(intx, AssertRepeat, 1, \ 2759 "number of times to evaluate expression in assert " \ 2760 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2761 \ 2762 notproduct(ccstrlist, SuppressErrorAt, "", \ 2763 "List of assertions (file:line) to muzzle") \ 2764 \ 2765 notproduct(uintx, HandleAllocationLimit, 1024, \ 2766 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2767 "is used") \ 2768 \ 2769 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2770 "Threshold for total handle allocation when " \ 2771 "+TraceHandleAllocation is used") \ 2772 \ 2773 develop(intx, StackPrintLimit, 100, \ 2774 "number of stack frames to print in VM-level stack dump") \ 2775 \ 2776 notproduct(intx, MaxElementPrintSize, 256, \ 2777 "maximum number of elements to print") \ 2778 \ 2779 notproduct(intx, MaxSubklassPrintSize, 4, \ 2780 "maximum number of subklasses to print when printing klass") \ 2781 \ 2782 product(intx, MaxInlineLevel, 9, \ 2783 "maximum number of nested calls that are inlined") \ 2784 \ 2785 product(intx, MaxRecursiveInlineLevel, 1, \ 2786 "maximum number of nested recursive calls that are inlined") \ 2787 \ 2788 product_pd(intx, InlineSmallCode, \ 2789 "Only inline already compiled methods if their code size is " \ 2790 "less than this") \ 2791 \ 2792 product(intx, MaxInlineSize, 35, \ 2793 "maximum bytecode size of a method to be inlined") \ 2794 \ 2795 product_pd(intx, FreqInlineSize, \ 2796 "maximum bytecode size of a frequent method to be inlined") \ 2797 \ 2798 product(intx, MaxTrivialSize, 6, \ 2799 "maximum bytecode size of a trivial method to be inlined") \ 2800 \ 2801 product(intx, MinInliningThreshold, 250, \ 2802 "min. invocation count a method needs to have to be inlined") \ 2803 \ 2804 develop(intx, AlignEntryCode, 4, \ 2805 "aligns entry code to specified value (in bytes)") \ 2806 \ 2807 develop(intx, MethodHistogramCutoff, 100, \ 2808 "cutoff value for method invoc. histogram (+CountCalls)") \ 2809 \ 2810 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2811 "# of interpreted methods to show in profile") \ 2812 \ 2813 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2814 "# of compiled methods to show in profile") \ 2815 \ 2816 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2817 "# of stub methods to show in profile") \ 2818 \ 2819 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2820 "# of runtime stub nodes to show in profile") \ 2821 \ 2822 product(intx, ProfileIntervalsTicks, 100, \ 2823 "# of ticks between printing of interval profile " \ 2824 "(+ProfileIntervals)") \ 2825 \ 2826 notproduct(intx, ScavengeALotInterval, 1, \ 2827 "Interval between which scavenge will occur with +ScavengeALot") \ 2828 \ 2829 notproduct(intx, FullGCALotInterval, 1, \ 2830 "Interval between which full gc will occur with +FullGCALot") \ 2831 \ 2832 notproduct(intx, FullGCALotStart, 0, \ 2833 "For which invocation to start FullGCAlot") \ 2834 \ 2835 notproduct(intx, FullGCALotDummies, 32*K, \ 2836 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2837 "to move") \ 2838 \ 2839 develop(intx, DontYieldALotInterval, 10, \ 2840 "Interval between which yields will be dropped (milliseconds)") \ 2841 \ 2842 develop(intx, MinSleepInterval, 1, \ 2843 "Minimum sleep() interval (milliseconds) when " \ 2844 "ConvertSleepToYield is off (used for SOLARIS)") \ 2845 \ 2846 product(intx, EventLogLength, 2000, \ 2847 "maximum nof events in event log") \ 2848 \ 2849 develop(intx, ProfilerPCTickThreshold, 15, \ 2850 "Number of ticks in a PC buckets to be a hotspot") \ 2851 \ 2852 notproduct(intx, DeoptimizeALotInterval, 5, \ 2853 "Number of exits until DeoptimizeALot kicks in") \ 2854 \ 2855 notproduct(intx, ZombieALotInterval, 5, \ 2856 "Number of exits until ZombieALot kicks in") \ 2857 \ 2858 develop(bool, StressNonEntrant, false, \ 2859 "Mark nmethods non-entrant at registration") \ 2860 \ 2861 diagnostic(intx, MallocVerifyInterval, 0, \ 2862 "if non-zero, verify C heap after every N calls to " \ 2863 "malloc/realloc/free") \ 2864 \ 2865 diagnostic(intx, MallocVerifyStart, 0, \ 2866 "if non-zero, start verifying C heap after Nth call to " \ 2867 "malloc/realloc/free") \ 2868 \ 2869 product(intx, TypeProfileWidth, 2, \ 2870 "number of receiver types to record in call/cast profile") \ 2871 \ 2872 develop(intx, BciProfileWidth, 2, \ 2873 "number of return bci's to record in ret profile") \ 2874 \ 2875 product(intx, PerMethodRecompilationCutoff, 400, \ 2876 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2877 \ 2878 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2879 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2880 \ 2881 product(intx, PerMethodTrapLimit, 100, \ 2882 "Limit on traps (of one kind) in a method (includes inlines)") \ 2883 \ 2884 product(intx, PerBytecodeTrapLimit, 4, \ 2885 "Limit on traps (of one kind) at a particular BCI") \ 2886 \ 2887 develop(intx, FreqCountInvocations, 1, \ 2888 "Scaling factor for branch frequencies (deprecated)") \ 2889 \ 2890 develop(intx, InlineFrequencyRatio, 20, \ 2891 "Ratio of call site execution to caller method invocation") \ 2892 \ 2893 develop_pd(intx, InlineFrequencyCount, \ 2894 "Count of call site execution necessary to trigger frequent " \ 2895 "inlining") \ 2896 \ 2897 develop(intx, InlineThrowCount, 50, \ 2898 "Force inlining of interpreted methods that throw this often") \ 2899 \ 2900 develop(intx, InlineThrowMaxSize, 200, \ 2901 "Force inlining of throwing methods smaller than this") \ 2902 \ 2903 product(intx, AliasLevel, 3, \ 2904 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2905 "2 for class split, 3 for unique instances") \ 2906 \ 2907 develop(bool, VerifyAliases, false, \ 2908 "perform extra checks on the results of alias analysis") \ 2909 \ 2910 develop(intx, ProfilerNodeSize, 1024, \ 2911 "Size in K to allocate for the Profile Nodes of each thread") \ 2912 \ 2913 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2914 "Number of times to spin wait on a v8 atomic operation lock") \ 2915 \ 2916 product(intx, ReadSpinIterations, 100, \ 2917 "Number of read attempts before a yield (spin inner loop)") \ 2918 \ 2919 product_pd(intx, PreInflateSpin, \ 2920 "Number of times to spin wait before inflation") \ 2921 \ 2922 product(intx, PreBlockSpin, 10, \ 2923 "Number of times to spin in an inflated lock before going to " \ 2924 "an OS lock") \ 2925 \ 2926 /* gc parameters */ \ 2927 product(uintx, InitialHeapSize, 0, \ 2928 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2929 \ 2930 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2931 "Maximum heap size (in bytes)") \ 2932 \ 2933 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2934 "Initial tenured generation size (in bytes)") \ 2935 \ 2936 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2937 "Initial new generation size (in bytes)") \ 2938 \ 2939 product(uintx, MaxNewSize, max_uintx, \ 2940 "Maximum new generation size (in bytes), max_uintx means set " \ 2941 "ergonomically") \ 2942 \ 2943 product(uintx, PretenureSizeThreshold, 0, \ 2944 "Maximum size in bytes of objects allocated in DefNew " \ 2945 "generation; zero means no maximum") \ 2946 \ 2947 product(uintx, TLABSize, 0, \ 2948 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2949 \ 2950 product(uintx, MinTLABSize, 2*K, \ 2951 "Minimum allowed TLAB size (in bytes)") \ 2952 \ 2953 product(uintx, TLABAllocationWeight, 35, \ 2954 "Allocation averaging weight") \ 2955 \ 2956 product(uintx, TLABWasteTargetPercent, 1, \ 2957 "Percentage of Eden that can be wasted") \ 2958 \ 2959 product(uintx, TLABRefillWasteFraction, 64, \ 2960 "Max TLAB waste at a refill (internal fragmentation)") \ 2961 \ 2962 product(uintx, TLABWasteIncrement, 4, \ 2963 "Increment allowed waste at slow allocation") \ 2964 \ 2965 product(intx, SurvivorRatio, 8, \ 2966 "Ratio of eden/survivor space size") \ 2967 \ 2968 product(intx, NewRatio, 2, \ 2969 "Ratio of new/old generation sizes") \ 2970 \ 2971 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2972 "Max percent of eden objects that will be live at scavenge") \ 2973 \ 2974 product_pd(uintx, NewSizeThreadIncrease, \ 2975 "Additional size added to desired new generation size per " \ 2976 "non-daemon thread (in bytes)") \ 2977 \ 2978 product_pd(uintx, PermSize, \ 2979 "Initial size of permanent generation (in bytes)") \ 2980 \ 2981 product_pd(uintx, MaxPermSize, \ 2982 "Maximum size of permanent generation (in bytes)") \ 2983 \ 2984 product(uintx, MinHeapFreeRatio, 40, \ 2985 "Min percentage of heap free after GC to avoid expansion") \ 2986 \ 2987 product(uintx, MaxHeapFreeRatio, 70, \ 2988 "Max percentage of heap free after GC to avoid shrinking") \ 2989 \ 2990 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2991 "Number of milliseconds per MB of free space in the heap") \ 2992 \ 2993 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2994 "Min change in heap space due to GC (in bytes)") \ 2995 \ 2996 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 2997 "Min expansion of permanent heap (in bytes)") \ 2998 \ 2999 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3000 "Max expansion of permanent heap without full GC (in bytes)") \ 3001 \ 3002 product(intx, QueuedAllocationWarningCount, 0, \ 3003 "Number of times an allocation that queues behind a GC " \ 3004 "will retry before printing a warning") \ 3005 \ 3006 diagnostic(uintx, VerifyGCStartAt, 0, \ 3007 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3008 \ 3009 diagnostic(intx, VerifyGCLevel, 0, \ 3010 "Generation level at which to start +VerifyBefore/AfterGC") \ 3011 \ 3012 develop(uintx, ExitAfterGCNum, 0, \ 3013 "If non-zero, exit after this GC.") \ 3014 \ 3015 product(intx, MaxTenuringThreshold, 15, \ 3016 "Maximum value for tenuring threshold") \ 3017 \ 3018 product(intx, InitialTenuringThreshold, 7, \ 3019 "Initial value for tenuring threshold") \ 3020 \ 3021 product(intx, TargetSurvivorRatio, 50, \ 3022 "Desired percentage of survivor space used after scavenge") \ 3023 \ 3024 product(uintx, MarkSweepDeadRatio, 5, \ 3025 "Percentage (0-100) of the old gen allowed as dead wood." \ 3026 "Serial mark sweep treats this as both the min and max value." \ 3027 "CMS uses this value only if it falls back to mark sweep." \ 3028 "Par compact uses a variable scale based on the density of the" \ 3029 "generation and treats this as the max value when the heap is" \ 3030 "either completely full or completely empty. Par compact also" \ 3031 "has a smaller default value; see arguments.cpp.") \ 3032 \ 3033 product(uintx, PermMarkSweepDeadRatio, 20, \ 3034 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3035 "See MarkSweepDeadRatio for collector-specific comments.") \ 3036 \ 3037 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3038 "How often should we fully compact the heap (ignoring the dead " \ 3039 "space parameters)") \ 3040 \ 3041 product(intx, PrintCMSStatistics, 0, \ 3042 "Statistics for CMS") \ 3043 \ 3044 product(bool, PrintCMSInitiationStatistics, false, \ 3045 "Statistics for initiating a CMS collection") \ 3046 \ 3047 product(intx, PrintFLSStatistics, 0, \ 3048 "Statistics for CMS' FreeListSpace") \ 3049 \ 3050 product(intx, PrintFLSCensus, 0, \ 3051 "Census for CMS' FreeListSpace") \ 3052 \ 3053 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3054 "Delay in ms between expansion and allocation") \ 3055 \ 3056 product(intx, DeferThrSuspendLoopCount, 4000, \ 3057 "(Unstable) Number of times to iterate in safepoint loop " \ 3058 " before blocking VM threads ") \ 3059 \ 3060 product(intx, DeferPollingPageLoopCount, -1, \ 3061 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3062 "before changing safepoint polling page to RO ") \ 3063 \ 3064 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3065 \ 3066 product(bool, UseDepthFirstScavengeOrder, true, \ 3067 "true: the scavenge order will be depth-first, " \ 3068 "false: the scavenge order will be breadth-first") \ 3069 \ 3070 product(bool, PSChunkLargeArrays, true, \ 3071 "true: process large arrays in chunks") \ 3072 \ 3073 product(uintx, GCDrainStackTargetSize, 64, \ 3074 "how many entries we'll try to leave on the stack during " \ 3075 "parallel GC") \ 3076 \ 3077 /* stack parameters */ \ 3078 product_pd(intx, StackYellowPages, \ 3079 "Number of yellow zone (recoverable overflows) pages") \ 3080 \ 3081 product_pd(intx, StackRedPages, \ 3082 "Number of red zone (unrecoverable overflows) pages") \ 3083 \ 3084 product_pd(intx, StackShadowPages, \ 3085 "Number of shadow zone (for overflow checking) pages" \ 3086 " this should exceed the depth of the VM and native call stack") \ 3087 \ 3088 product_pd(intx, ThreadStackSize, \ 3089 "Thread Stack Size (in Kbytes)") \ 3090 \ 3091 product_pd(intx, VMThreadStackSize, \ 3092 "Non-Java Thread Stack Size (in Kbytes)") \ 3093 \ 3094 product_pd(intx, CompilerThreadStackSize, \ 3095 "Compiler Thread Stack Size (in Kbytes)") \ 3096 \ 3097 develop_pd(uintx, JVMInvokeMethodSlack, \ 3098 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3099 \ 3100 product(uintx, ThreadSafetyMargin, 50*M, \ 3101 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3102 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3103 "disable this feature") \ 3104 \ 3105 /* code cache parameters */ \ 3106 develop(uintx, CodeCacheSegmentSize, 64, \ 3107 "Code cache segment size (in bytes) - smallest unit of " \ 3108 "allocation") \ 3109 \ 3110 develop_pd(intx, CodeEntryAlignment, \ 3111 "Code entry alignment for generated code (in bytes)") \ 3112 \ 3113 product_pd(uintx, InitialCodeCacheSize, \ 3114 "Initial code cache size (in bytes)") \ 3115 \ 3116 product_pd(uintx, ReservedCodeCacheSize, \ 3117 "Reserved code cache size (in bytes) - maximum code cache size") \ 3118 \ 3119 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3120 "When less than X space left, we stop compiling.") \ 3121 \ 3122 product_pd(uintx, CodeCacheExpansionSize, \ 3123 "Code cache expansion size (in bytes)") \ 3124 \ 3125 develop_pd(uintx, CodeCacheMinBlockLength, \ 3126 "Minimum number of segments in a code cache block.") \ 3127 \ 3128 notproduct(bool, ExitOnFullCodeCache, false, \ 3129 "Exit the VM if we fill the code cache.") \ 3130 \ 3131 product(bool, UseCodeCacheFlushing, false, \ 3132 "Attempt to clean the code cache before shutting off compiler") \ 3133 \ 3134 product(intx, MinCodeCacheFlushingInterval, 30, \ 3135 "Min number of seconds between code cache cleaning sessions") \ 3136 \ 3137 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3138 "When less than X space left, start code cache cleaning") \ 3139 \ 3140 /* interpreter debugging */ \ 3141 develop(intx, BinarySwitchThreshold, 5, \ 3142 "Minimal number of lookupswitch entries for rewriting to binary " \ 3143 "switch") \ 3144 \ 3145 develop(intx, StopInterpreterAt, 0, \ 3146 "Stops interpreter execution at specified bytecode number") \ 3147 \ 3148 develop(intx, TraceBytecodesAt, 0, \ 3149 "Traces bytecodes starting with specified bytecode number") \ 3150 \ 3151 /* compiler interface */ \ 3152 develop(intx, CIStart, 0, \ 3153 "the id of the first compilation to permit") \ 3154 \ 3155 develop(intx, CIStop, -1, \ 3156 "the id of the last compilation to permit") \ 3157 \ 3158 develop(intx, CIStartOSR, 0, \ 3159 "the id of the first osr compilation to permit " \ 3160 "(CICountOSR must be on)") \ 3161 \ 3162 develop(intx, CIStopOSR, -1, \ 3163 "the id of the last osr compilation to permit " \ 3164 "(CICountOSR must be on)") \ 3165 \ 3166 develop(intx, CIBreakAtOSR, -1, \ 3167 "id of osr compilation to break at") \ 3168 \ 3169 develop(intx, CIBreakAt, -1, \ 3170 "id of compilation to break at") \ 3171 \ 3172 product(ccstrlist, CompileOnly, "", \ 3173 "List of methods (pkg/class.name) to restrict compilation to") \ 3174 \ 3175 product(ccstr, CompileCommandFile, NULL, \ 3176 "Read compiler commands from this file [.hotspot_compiler]") \ 3177 \ 3178 product(ccstrlist, CompileCommand, "", \ 3179 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3180 \ 3181 product(bool, CICompilerCountPerCPU, false, \ 3182 "1 compiler thread for log(N CPUs)") \ 3183 \ 3184 develop(intx, CIFireOOMAt, -1, \ 3185 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3186 "(non-negative value throws OOM after this many CI accesses " \ 3187 "in each compile)") \ 3188 \ 3189 develop(intx, CIFireOOMAtDelay, -1, \ 3190 "Wait for this many CI accesses to occur in all compiles before " \ 3191 "beginning to throw OutOfMemoryErrors in each compile") \ 3192 \ 3193 notproduct(bool, CIObjectFactoryVerify, false, \ 3194 "enable potentially expensive verification in ciObjectFactory") \ 3195 \ 3196 /* Priorities */ \ 3197 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3198 \ 3199 product(intx, ThreadPriorityPolicy, 0, \ 3200 "0 : Normal. "\ 3201 " VM chooses priorities that are appropriate for normal "\ 3202 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3203 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3204 " map to lower native priority values. On Windows applications"\ 3205 " are allowed to use higher native priorities. However, with "\ 3206 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3207 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3208 " interfere with system threads. On Linux thread priorities "\ 3209 " are ignored because the OS does not support static priority "\ 3210 " in SCHED_OTHER scheduling class which is the only choice for"\ 3211 " non-root, non-realtime applications. "\ 3212 "1 : Aggressive. "\ 3213 " Java thread priorities map over to the entire range of "\ 3214 " native thread priorities. Higher Java thread priorities map "\ 3215 " to higher native thread priorities. This policy should be "\ 3216 " used with care, as sometimes it can cause performance "\ 3217 " degradation in the application and/or the entire system. On "\ 3218 " Linux this policy requires root privilege.") \ 3219 \ 3220 product(bool, ThreadPriorityVerbose, false, \ 3221 "print priority changes") \ 3222 \ 3223 product(intx, DefaultThreadPriority, -1, \ 3224 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3225 \ 3226 product(intx, CompilerThreadPriority, -1, \ 3227 "what priority should compiler threads run at (-1 means no change)") \ 3228 \ 3229 product(intx, VMThreadPriority, -1, \ 3230 "what priority should VM threads run at (-1 means no change)") \ 3231 \ 3232 product(bool, CompilerThreadHintNoPreempt, true, \ 3233 "(Solaris only) Give compiler threads an extra quanta") \ 3234 \ 3235 product(bool, VMThreadHintNoPreempt, false, \ 3236 "(Solaris only) Give VM thread an extra quanta") \ 3237 \ 3238 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3239 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3240 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3241 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3242 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3243 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3244 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3245 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3246 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3247 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3248 \ 3249 /* compiler debugging */ \ 3250 notproduct(intx, CompileTheWorldStartAt, 1, \ 3251 "First class to consider when using +CompileTheWorld") \ 3252 \ 3253 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3254 "Last class to consider when using +CompileTheWorld") \ 3255 \ 3256 develop(intx, NewCodeParameter, 0, \ 3257 "Testing Only: Create a dedicated integer parameter before " \ 3258 "putback") \ 3259 \ 3260 /* new oopmap storage allocation */ \ 3261 develop(intx, MinOopMapAllocation, 8, \ 3262 "Minimum number of OopMap entries in an OopMapSet") \ 3263 \ 3264 /* Background Compilation */ \ 3265 develop(intx, LongCompileThreshold, 50, \ 3266 "Used with +TraceLongCompiles") \ 3267 \ 3268 product(intx, StarvationMonitorInterval, 200, \ 3269 "Pause between each check in ms") \ 3270 \ 3271 /* recompilation */ \ 3272 product_pd(intx, CompileThreshold, \ 3273 "number of interpreted method invocations before (re-)compiling") \ 3274 \ 3275 product_pd(intx, BackEdgeThreshold, \ 3276 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3277 \ 3278 product(intx, Tier1BytecodeLimit, 10, \ 3279 "Must have at least this many bytecodes before tier1" \ 3280 "invocation counters are used") \ 3281 \ 3282 product_pd(intx, Tier2CompileThreshold, \ 3283 "threshold at which a tier 2 compilation is invoked") \ 3284 \ 3285 product_pd(intx, Tier2BackEdgeThreshold, \ 3286 "Back edge threshold at which a tier 2 compilation is invoked") \ 3287 \ 3288 product_pd(intx, Tier3CompileThreshold, \ 3289 "threshold at which a tier 3 compilation is invoked") \ 3290 \ 3291 product_pd(intx, Tier3BackEdgeThreshold, \ 3292 "Back edge threshold at which a tier 3 compilation is invoked") \ 3293 \ 3294 product_pd(intx, Tier4CompileThreshold, \ 3295 "threshold at which a tier 4 compilation is invoked") \ 3296 \ 3297 product_pd(intx, Tier4BackEdgeThreshold, \ 3298 "Back edge threshold at which a tier 4 compilation is invoked") \ 3299 \ 3300 product_pd(bool, TieredCompilation, \ 3301 "Enable two-tier compilation") \ 3302 \ 3303 product(bool, StressTieredRuntime, false, \ 3304 "Alternate client and server compiler on compile requests") \ 3305 \ 3306 product_pd(intx, OnStackReplacePercentage, \ 3307 "NON_TIERED number of method invocations/branches (expressed as %"\ 3308 "of CompileThreshold) before (re-)compiling OSR code") \ 3309 \ 3310 product(intx, InterpreterProfilePercentage, 33, \ 3311 "NON_TIERED number of method invocations/branches (expressed as %"\ 3312 "of CompileThreshold) before profiling in the interpreter") \ 3313 \ 3314 develop(intx, MaxRecompilationSearchLength, 10, \ 3315 "max. # frames to inspect searching for recompilee") \ 3316 \ 3317 develop(intx, MaxInterpretedSearchLength, 3, \ 3318 "max. # interp. frames to skip when searching for recompilee") \ 3319 \ 3320 develop(intx, DesiredMethodLimit, 8000, \ 3321 "desired max. method size (in bytecodes) after inlining") \ 3322 \ 3323 develop(intx, HugeMethodLimit, 8000, \ 3324 "don't compile methods larger than this if " \ 3325 "+DontCompileHugeMethods") \ 3326 \ 3327 /* New JDK 1.4 reflection implementation */ \ 3328 \ 3329 develop(bool, UseNewReflection, true, \ 3330 "Temporary flag for transition to reflection based on dynamic " \ 3331 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3332 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3333 "changes were needed") \ 3334 \ 3335 develop(bool, VerifyReflectionBytecodes, false, \ 3336 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3337 "in situations like that described in 4486457 or for " \ 3338 "constructors generated for serialization, so can not be enabled "\ 3339 "in product.") \ 3340 \ 3341 product(bool, ReflectionWrapResolutionErrors, true, \ 3342 "Temporary flag for transition to AbstractMethodError wrapped " \ 3343 "in InvocationTargetException. See 6531596") \ 3344 \ 3345 \ 3346 develop(intx, FastSuperclassLimit, 8, \ 3347 "Depth of hardwired instanceof accelerator array") \ 3348 \ 3349 /* Properties for Java libraries */ \ 3350 \ 3351 product(intx, MaxDirectMemorySize, -1, \ 3352 "Maximum total size of NIO direct-buffer allocations") \ 3353 \ 3354 /* temporary developer defined flags */ \ 3355 \ 3356 diagnostic(bool, UseNewCode, false, \ 3357 "Testing Only: Use the new version while testing") \ 3358 \ 3359 diagnostic(bool, UseNewCode2, false, \ 3360 "Testing Only: Use the new version while testing") \ 3361 \ 3362 diagnostic(bool, UseNewCode3, false, \ 3363 "Testing Only: Use the new version while testing") \ 3364 \ 3365 /* flags for performance data collection */ \ 3366 \ 3367 product(bool, UsePerfData, true, \ 3368 "Flag to disable jvmstat instrumentation for performance testing" \ 3369 "and problem isolation purposes.") \ 3370 \ 3371 product(bool, PerfDataSaveToFile, false, \ 3372 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3373 \ 3374 product(ccstr, PerfDataSaveFile, NULL, \ 3375 "Save PerfData memory to the specified absolute pathname," \ 3376 "%p in the file name if present will be replaced by pid") \ 3377 \ 3378 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3379 "Data sampling interval in milliseconds") \ 3380 \ 3381 develop(bool, PerfTraceDataCreation, false, \ 3382 "Trace creation of Performance Data Entries") \ 3383 \ 3384 develop(bool, PerfTraceMemOps, false, \ 3385 "Trace PerfMemory create/attach/detach calls") \ 3386 \ 3387 product(bool, PerfDisableSharedMem, false, \ 3388 "Store performance data in standard memory") \ 3389 \ 3390 product(intx, PerfDataMemorySize, 32*K, \ 3391 "Size of performance data memory region. Will be rounded " \ 3392 "up to a multiple of the native os page size.") \ 3393 \ 3394 product(intx, PerfMaxStringConstLength, 1024, \ 3395 "Maximum PerfStringConstant string length before truncation") \ 3396 \ 3397 product(bool, PerfAllowAtExitRegistration, false, \ 3398 "Allow registration of atexit() methods") \ 3399 \ 3400 product(bool, PerfBypassFileSystemCheck, false, \ 3401 "Bypass Win32 file system criteria checks (Windows Only)") \ 3402 \ 3403 product(intx, UnguardOnExecutionViolation, 0, \ 3404 "Unguard page and retry on no-execute fault (Win32 only)" \ 3405 "0=off, 1=conservative, 2=aggressive") \ 3406 \ 3407 /* Serviceability Support */ \ 3408 \ 3409 product(bool, ManagementServer, false, \ 3410 "Create JMX Management Server") \ 3411 \ 3412 product(bool, DisableAttachMechanism, false, \ 3413 "Disable mechanism that allows tools to attach to this VM") \ 3414 \ 3415 product(bool, StartAttachListener, false, \ 3416 "Always start Attach Listener at VM startup") \ 3417 \ 3418 manageable(bool, PrintConcurrentLocks, false, \ 3419 "Print java.util.concurrent locks in thread dump") \ 3420 \ 3421 /* Shared spaces */ \ 3422 \ 3423 product(bool, UseSharedSpaces, true, \ 3424 "Use shared spaces in the permanent generation") \ 3425 \ 3426 product(bool, RequireSharedSpaces, false, \ 3427 "Require shared spaces in the permanent generation") \ 3428 \ 3429 product(bool, ForceSharedSpaces, false, \ 3430 "Require shared spaces in the permanent generation") \ 3431 \ 3432 product(bool, DumpSharedSpaces, false, \ 3433 "Special mode: JVM reads a class list, loads classes, builds " \ 3434 "shared spaces, and dumps the shared spaces to a file to be " \ 3435 "used in future JVM runs.") \ 3436 \ 3437 product(bool, PrintSharedSpaces, false, \ 3438 "Print usage of shared spaces") \ 3439 \ 3440 product(uintx, SharedDummyBlockSize, 512*M, \ 3441 "Size of dummy block used to shift heap addresses (in bytes)") \ 3442 \ 3443 product(uintx, SharedReadWriteSize, 12*M, \ 3444 "Size of read-write space in permanent generation (in bytes)") \ 3445 \ 3446 product(uintx, SharedReadOnlySize, 10*M, \ 3447 "Size of read-only space in permanent generation (in bytes)") \ 3448 \ 3449 product(uintx, SharedMiscDataSize, 4*M, \ 3450 "Size of the shared data area adjacent to the heap (in bytes)") \ 3451 \ 3452 product(uintx, SharedMiscCodeSize, 4*M, \ 3453 "Size of the shared code area adjacent to the heap (in bytes)") \ 3454 \ 3455 diagnostic(bool, SharedOptimizeColdStart, true, \ 3456 "At dump time, order shared objects to achieve better " \ 3457 "cold startup time.") \ 3458 \ 3459 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3460 "Reordering policy for SharedOptimizeColdStart " \ 3461 "0=favor classload-time locality, 1=balanced, " \ 3462 "2=favor runtime locality") \ 3463 \ 3464 diagnostic(bool, SharedSkipVerify, false, \ 3465 "Skip assert() and verify() which page-in unwanted shared " \ 3466 "objects. ") \ 3467 \ 3468 product(bool, AnonymousClasses, false, \ 3469 "support sun.misc.Unsafe.defineAnonymousClass") \ 3470 \ 3471 experimental(bool, EnableMethodHandles, false, \ 3472 "support method handles (true by default under JSR 292)") \ 3473 \ 3474 diagnostic(intx, MethodHandlePushLimit, 3, \ 3475 "number of additional stack slots a method handle may push") \ 3476 \ 3477 develop(bool, TraceMethodHandles, false, \ 3478 "trace internal method handle operations") \ 3479 \ 3480 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3481 "perform extra checks when constructing method handles") \ 3482 \ 3483 diagnostic(bool, OptimizeMethodHandles, true, \ 3484 "when constructing method handles, try to improve them") \ 3485 \ 3486 experimental(bool, TrustFinalNonStaticFields, false, \ 3487 "trust final non-static declarations for constant folding") \ 3488 \ 3489 experimental(bool, EnableInvokeDynamic, false, \ 3490 "recognize the invokedynamic instruction") \ 3491 \ 3492 develop(bool, TraceInvokeDynamic, false, \ 3493 "trace internal invoke dynamic operations") \ 3494 \ 3495 product(bool, TaggedStackInterpreter, false, \ 3496 "Insert tags in interpreter execution stack for oopmap generaion")\ 3497 \ 3498 diagnostic(bool, PauseAtStartup, false, \ 3499 "Causes the VM to pause at startup time and wait for the pause " \ 3500 "file to be removed (default: ./vm.paused.<pid>)") \ 3501 \ 3502 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3503 "The file to create and for whose removal to await when pausing " \ 3504 "at startup. (default: ./vm.paused.<pid>)") \ 3505 \ 3506 product(bool, ExtendedDTraceProbes, false, \ 3507 "Enable performance-impacting dtrace probes") \ 3508 \ 3509 product(bool, DTraceMethodProbes, false, \ 3510 "Enable dtrace probes for method-entry and method-exit") \ 3511 \ 3512 product(bool, DTraceAllocProbes, false, \ 3513 "Enable dtrace probes for object allocation") \ 3514 \ 3515 product(bool, DTraceMonitorProbes, false, \ 3516 "Enable dtrace probes for monitor events") \ 3517 \ 3518 product(bool, RelaxAccessControlCheck, false, \ 3519 "Relax the access control checks in the verifier") \ 3520 \ 3521 diagnostic(bool, PrintDTraceDOF, false, \ 3522 "Print the DTrace DOF passed to the system for JSDT probes") \ 3523 \ 3524 product(bool, UseVMInterruptibleIO, false, \ 3525 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3526 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3527 " of this flag is true for JDK 6 and earliers") 3528 3529 3530/* 3531 * Macros for factoring of globals 3532 */ 3533 3534// Interface macros 3535#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3536#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3537#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3538#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3539#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3540#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3541#ifdef PRODUCT 3542#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3543#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3544#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3545#else 3546#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3547#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3548#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3549#endif 3550// Special LP64 flags, product only needed for now. 3551#ifdef _LP64 3552#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3553#else 3554#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3555#endif // _LP64 3556 3557// Implementation macros 3558#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3559#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3560#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3561#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3562#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3563#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3564#ifdef PRODUCT 3565#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3566#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3567#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3568#else 3569#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3570#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3571#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3572#endif 3573#ifdef _LP64 3574#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3575#else 3576#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3577#endif // _LP64 3578 3579RUNTIME_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) 3580 3581RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3582