globals.hpp revision 1810:f5c8d6e5bfee
1/* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 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, BackEdgeThreshold, 0); 39 40define_pd_global(intx, OnStackReplacePercentage, 0); 41define_pd_global(bool, ResizeTLAB, false); 42define_pd_global(intx, FreqInlineSize, 0); 43define_pd_global(intx, InlineSmallCode, 0); 44define_pd_global(intx, NewSizeThreadIncrease, 4*K); 45define_pd_global(intx, InlineClassNatives, true); 46define_pd_global(intx, InlineUnsafeOps, true); 47define_pd_global(intx, InitialCodeCacheSize, 160*K); 48define_pd_global(intx, ReservedCodeCacheSize, 32*M); 49define_pd_global(intx, CodeCacheExpansionSize, 32*K); 50define_pd_global(intx, CodeCacheMinBlockLength, 1); 51define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 52define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 53define_pd_global(bool, NeverActAsServerClassMachine, true); 54define_pd_global(uint64_t,MaxRAM, 1ULL*G); 55#define CI_COMPILER_COUNT 0 56#else 57 58#ifdef COMPILER2 59#define CI_COMPILER_COUNT 2 60#else 61#define CI_COMPILER_COUNT 1 62#endif // COMPILER2 63 64#endif // no compilers 65 66 67// string type aliases used only in this file 68typedef const char* ccstr; 69typedef const char* ccstrlist; // represents string arguments which accumulate 70 71enum FlagValueOrigin { 72 DEFAULT = 0, 73 COMMAND_LINE = 1, 74 ENVIRON_VAR = 2, 75 CONFIG_FILE = 3, 76 MANAGEMENT = 4, 77 ERGONOMIC = 5, 78 ATTACH_ON_DEMAND = 6, 79 INTERNAL = 99 80}; 81 82struct Flag { 83 const char *type; 84 const char *name; 85 void* addr; 86 87 NOT_PRODUCT(const char *doc;) 88 89 const char *kind; 90 FlagValueOrigin origin; 91 92 // points to all Flags static array 93 static Flag *flags; 94 95 // number of flags 96 static size_t numFlags; 97 98 static Flag* find_flag(char* name, size_t length); 99 100 bool is_bool() const { return strcmp(type, "bool") == 0; } 101 bool get_bool() const { return *((bool*) addr); } 102 void set_bool(bool value) { *((bool*) addr) = value; } 103 104 bool is_intx() const { return strcmp(type, "intx") == 0; } 105 intx get_intx() const { return *((intx*) addr); } 106 void set_intx(intx value) { *((intx*) addr) = value; } 107 108 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 109 uintx get_uintx() const { return *((uintx*) addr); } 110 void set_uintx(uintx value) { *((uintx*) addr) = value; } 111 112 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 113 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 114 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 115 116 bool is_double() const { return strcmp(type, "double") == 0; } 117 double get_double() const { return *((double*) addr); } 118 void set_double(double value) { *((double*) addr) = value; } 119 120 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 121 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 122 ccstr get_ccstr() const { return *((ccstr*) addr); } 123 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 124 125 bool is_unlocker() const; 126 bool is_unlocked() const; 127 bool is_writeable() const; 128 bool is_external() const; 129 130 void print_on(outputStream* st, bool withComments = false ); 131 void print_as_flag(outputStream* st); 132}; 133 134// debug flags control various aspects of the VM and are global accessible 135 136// use FlagSetting to temporarily change some debug flag 137// e.g. FlagSetting fs(DebugThisAndThat, true); 138// restored to previous value upon leaving scope 139class FlagSetting { 140 bool val; 141 bool* flag; 142 public: 143 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 144 ~FlagSetting() { *flag = val; } 145}; 146 147 148class CounterSetting { 149 intx* counter; 150 public: 151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 152 ~CounterSetting() { (*counter)--; } 153}; 154 155 156class IntFlagSetting { 157 intx val; 158 intx* flag; 159 public: 160 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 161 ~IntFlagSetting() { *flag = val; } 162}; 163 164 165class DoubleFlagSetting { 166 double val; 167 double* flag; 168 public: 169 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 170 ~DoubleFlagSetting() { *flag = val; } 171}; 172 173 174class CommandLineFlags { 175 public: 176 static bool boolAt(char* name, size_t len, bool* value); 177 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 178 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 179 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 180 181 static bool intxAt(char* name, size_t len, intx* value); 182 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 183 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 184 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 185 186 static bool uintxAt(char* name, size_t len, uintx* value); 187 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 188 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 189 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 190 191 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 192 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 193 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 194 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 195 196 static bool doubleAt(char* name, size_t len, double* value); 197 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 198 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 199 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 200 201 static bool ccstrAt(char* name, size_t len, ccstr* value); 202 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 203 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 204 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 205 206 // Returns false if name is not a command line flag. 207 static bool wasSetOnCmdline(const char* name, bool* value); 208 static void printSetFlags(); 209 210 static void printFlags(bool withComments = false ); 211 212 static void verify() PRODUCT_RETURN; 213}; 214 215// use this for flags that are true by default in the debug version but 216// false in the optimized version, and vice versa 217#ifdef ASSERT 218#define trueInDebug true 219#define falseInDebug false 220#else 221#define trueInDebug false 222#define falseInDebug true 223#endif 224 225// use this for flags that are true per default in the product build 226// but false in development builds, and vice versa 227#ifdef PRODUCT 228#define trueInProduct true 229#define falseInProduct false 230#else 231#define trueInProduct false 232#define falseInProduct true 233#endif 234 235// use this for flags that are true per default in the tiered build 236// but false in non-tiered builds, and vice versa 237#ifdef TIERED 238#define trueInTiered true 239#define falseInTiered false 240#else 241#define trueInTiered false 242#define falseInTiered true 243#endif 244 245// develop flags are settable / visible only during development and are constant in the PRODUCT version 246// product flags are always settable / visible 247// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 248 249// A flag must be declared with one of the following types: 250// bool, intx, uintx, ccstr. 251// The type "ccstr" is an alias for "const char*" and is used 252// only in this file, because the macrology requires single-token type names. 253 254// Note: Diagnostic options not meant for VM tuning or for product modes. 255// They are to be used for VM quality assurance or field diagnosis 256// of VM bugs. They are hidden so that users will not be encouraged to 257// try them as if they were VM ordinary execution options. However, they 258// are available in the product version of the VM. Under instruction 259// from support engineers, VM customers can turn them on to collect 260// diagnostic information about VM problems. To use a VM diagnostic 261// option, you must first specify +UnlockDiagnosticVMOptions. 262// (This master switch also affects the behavior of -Xprintflags.) 263// 264// experimental flags are in support of features that are not 265// part of the officially supported product, but are available 266// for experimenting with. They could, for example, be performance 267// features that may not have undergone full or rigorous QA, but which may 268// help performance in some cases and released for experimentation 269// by the community of users and developers. This flag also allows one to 270// be able to build a fully supported product that nonetheless also 271// ships with some unsupported, lightly tested, experimental features. 272// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 273// UnlockExperimentalVMOptions flag, which allows the control and 274// modification of the experimental flags. 275// 276// Nota bene: neither diagnostic nor experimental options should be used casually, 277// and they are not supported on production loads, except under explicit 278// direction from support engineers. 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 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 325 "Default object alignment in bytes, 8 is minimum") \ 326 \ 327 /* UseMembar is theoretically a temp flag used for memory barrier \ 328 * removal testing. It was supposed to be removed before FCS but has \ 329 * been re-added (see 6401008) */ \ 330 product_pd(bool, UseMembar, \ 331 "(Unstable) Issues membars on thread state transitions") \ 332 \ 333 /* Temporary: See 6948537 */ \ 334 experimental(bool, UseMemSetInBOT, true, \ 335 "(Unstable) uses memset in BOT updates in GC code") \ 336 \ 337 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 338 "Enable normal processing of flags relating to field diagnostics")\ 339 \ 340 experimental(bool, UnlockExperimentalVMOptions, false, \ 341 "Enable normal processing of flags relating to experimental features")\ 342 \ 343 product(bool, JavaMonitorsInStackTrace, true, \ 344 "Print info. about Java monitor locks when the stacks are dumped")\ 345 \ 346 product_pd(bool, UseLargePages, \ 347 "Use large page memory") \ 348 \ 349 product_pd(bool, UseLargePagesIndividualAllocation, \ 350 "Allocate large pages individually for better affinity") \ 351 \ 352 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 353 "Fail large pages individual allocation") \ 354 \ 355 develop(bool, TracePageSizes, false, \ 356 "Trace page size selection and usage.") \ 357 \ 358 product(bool, UseNUMA, false, \ 359 "Use NUMA if available") \ 360 \ 361 product(bool, ForceNUMA, false, \ 362 "Force NUMA optimizations on single-node/UMA systems") \ 363 \ 364 product(intx, NUMAChunkResizeWeight, 20, \ 365 "Percentage (0-100) used to weight the current sample when " \ 366 "computing exponentially decaying average for " \ 367 "AdaptiveNUMAChunkSizing") \ 368 \ 369 product(intx, NUMASpaceResizeRate, 1*G, \ 370 "Do not reallocate more that this amount per collection") \ 371 \ 372 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 373 "Enable adaptive chunk sizing for NUMA") \ 374 \ 375 product(bool, NUMAStats, false, \ 376 "Print NUMA stats in detailed heap information") \ 377 \ 378 product(intx, NUMAPageScanRate, 256, \ 379 "Maximum number of pages to include in the page scan procedure") \ 380 \ 381 product_pd(bool, NeedsDeoptSuspend, \ 382 "True for register window machines (sparc/ia64)") \ 383 \ 384 product(intx, UseSSE, 99, \ 385 "Highest supported SSE instructions set on x86/x64") \ 386 \ 387 product(uintx, LargePageSizeInBytes, 0, \ 388 "Large page size (0 to let VM choose the page size") \ 389 \ 390 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 391 "Use large pages if max heap is at least this big") \ 392 \ 393 product(bool, ForceTimeHighResolution, false, \ 394 "Using high time resolution(For Win32 only)") \ 395 \ 396 develop(bool, TraceItables, false, \ 397 "Trace initialization and use of itables") \ 398 \ 399 develop(bool, TracePcPatching, false, \ 400 "Trace usage of frame::patch_pc") \ 401 \ 402 develop(bool, TraceJumps, false, \ 403 "Trace assembly jumps in thread ring buffer") \ 404 \ 405 develop(bool, TraceRelocator, false, \ 406 "Trace the bytecode relocator") \ 407 \ 408 develop(bool, TraceLongCompiles, false, \ 409 "Print out every time compilation is longer than " \ 410 "a given threashold") \ 411 \ 412 develop(bool, SafepointALot, false, \ 413 "Generates a lot of safepoints. Works with " \ 414 "GuaranteedSafepointInterval") \ 415 \ 416 product_pd(bool, BackgroundCompilation, \ 417 "A thread requesting compilation is not blocked during " \ 418 "compilation") \ 419 \ 420 product(bool, PrintVMQWaitTime, false, \ 421 "Prints out the waiting time in VM operation queue") \ 422 \ 423 develop(bool, BailoutToInterpreterForThrows, false, \ 424 "Compiled methods which throws/catches exceptions will be " \ 425 "deopt and intp.") \ 426 \ 427 develop(bool, NoYieldsInMicrolock, false, \ 428 "Disable yields in microlock") \ 429 \ 430 develop(bool, TraceOopMapGeneration, false, \ 431 "Shows oopmap generation") \ 432 \ 433 product(bool, MethodFlushing, true, \ 434 "Reclamation of zombie and not-entrant methods") \ 435 \ 436 develop(bool, VerifyStack, false, \ 437 "Verify stack of each thread when it is entering a runtime call") \ 438 \ 439 develop(bool, ForceUnreachable, false, \ 440 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 441 \ 442 notproduct(bool, StressDerivedPointers, false, \ 443 "Force scavenge when a derived pointers is detected on stack " \ 444 "after rtm call") \ 445 \ 446 develop(bool, TraceDerivedPointers, false, \ 447 "Trace traversal of derived pointers on stack") \ 448 \ 449 notproduct(bool, TraceCodeBlobStacks, false, \ 450 "Trace stack-walk of codeblobs") \ 451 \ 452 product(bool, PrintJNIResolving, false, \ 453 "Used to implement -v:jni") \ 454 \ 455 notproduct(bool, PrintRewrites, false, \ 456 "Print methods that are being rewritten") \ 457 \ 458 product(bool, UseInlineCaches, true, \ 459 "Use Inline Caches for virtual calls ") \ 460 \ 461 develop(bool, InlineArrayCopy, true, \ 462 "inline arraycopy native that is known to be part of " \ 463 "base library DLL") \ 464 \ 465 develop(bool, InlineObjectHash, true, \ 466 "inline Object::hashCode() native that is known to be part " \ 467 "of base library DLL") \ 468 \ 469 develop(bool, InlineObjectCopy, true, \ 470 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 471 \ 472 develop(bool, InlineNatives, true, \ 473 "inline natives that are known to be part of base library DLL") \ 474 \ 475 develop(bool, InlineMathNatives, true, \ 476 "inline SinD, CosD, etc.") \ 477 \ 478 develop(bool, InlineClassNatives, true, \ 479 "inline Class.isInstance, etc") \ 480 \ 481 develop(bool, InlineAtomicLong, true, \ 482 "inline sun.misc.AtomicLong") \ 483 \ 484 develop(bool, InlineThreadNatives, true, \ 485 "inline Thread.currentThread, etc") \ 486 \ 487 develop(bool, InlineReflectionGetCallerClass, true, \ 488 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 489 "of base library DLL") \ 490 \ 491 develop(bool, InlineUnsafeOps, true, \ 492 "inline memory ops (native methods) from sun.misc.Unsafe") \ 493 \ 494 develop(bool, ConvertCmpD2CmpF, true, \ 495 "Convert cmpD to cmpF when one input is constant in float range") \ 496 \ 497 develop(bool, ConvertFloat2IntClipping, true, \ 498 "Convert float2int clipping idiom to integer clipping") \ 499 \ 500 develop(bool, SpecialStringCompareTo, true, \ 501 "special version of string compareTo") \ 502 \ 503 develop(bool, SpecialStringIndexOf, true, \ 504 "special version of string indexOf") \ 505 \ 506 develop(bool, SpecialStringEquals, true, \ 507 "special version of string equals") \ 508 \ 509 develop(bool, SpecialArraysEquals, true, \ 510 "special version of Arrays.equals(char[],char[])") \ 511 \ 512 product(bool, UseSSE42Intrinsics, false, \ 513 "SSE4.2 versions of intrinsics") \ 514 \ 515 develop(bool, TraceCallFixup, false, \ 516 "traces all call fixups") \ 517 \ 518 develop(bool, DeoptimizeALot, false, \ 519 "deoptimize at every exit from the runtime system") \ 520 \ 521 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 522 "a comma separated list of bcis to deoptimize at") \ 523 \ 524 product(bool, DeoptimizeRandom, false, \ 525 "deoptimize random frames on random exit from the runtime system")\ 526 \ 527 notproduct(bool, ZombieALot, false, \ 528 "creates zombies (non-entrant) at exit from the runt. system") \ 529 \ 530 notproduct(bool, WalkStackALot, false, \ 531 "trace stack (no print) at every exit from the runtime system") \ 532 \ 533 develop(bool, Debugging, false, \ 534 "set when executing debug methods in debug.ccp " \ 535 "(to prevent triggering assertions)") \ 536 \ 537 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 538 "Enable strict checks that safepoints cannot happen for threads " \ 539 "that used No_Safepoint_Verifier") \ 540 \ 541 notproduct(bool, VerifyLastFrame, false, \ 542 "Verify oops on last frame on entry to VM") \ 543 \ 544 develop(bool, TraceHandleAllocation, false, \ 545 "Prints out warnings when suspicious many handles are allocated") \ 546 \ 547 product(bool, UseCompilerSafepoints, true, \ 548 "Stop at safepoints in compiled code") \ 549 \ 550 product(bool, UseSplitVerifier, true, \ 551 "use split verifier with StackMapTable attributes") \ 552 \ 553 product(bool, FailOverToOldVerifier, true, \ 554 "fail over to old verifier when split verifier fails") \ 555 \ 556 develop(bool, ShowSafepointMsgs, false, \ 557 "Show msg. about safepoint synch.") \ 558 \ 559 product(bool, SafepointTimeout, false, \ 560 "Time out and warn or fail after SafepointTimeoutDelay " \ 561 "milliseconds if failed to reach safepoint") \ 562 \ 563 develop(bool, DieOnSafepointTimeout, false, \ 564 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 565 \ 566 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 567 /* typically, at most a few retries are needed */ \ 568 product(intx, SuspendRetryCount, 50, \ 569 "Maximum retry count for an external suspend request") \ 570 \ 571 product(intx, SuspendRetryDelay, 5, \ 572 "Milliseconds to delay per retry (* current_retry_count)") \ 573 \ 574 product(bool, AssertOnSuspendWaitFailure, false, \ 575 "Assert/Guarantee on external suspend wait failure") \ 576 \ 577 product(bool, TraceSuspendWaitFailures, false, \ 578 "Trace external suspend wait failures") \ 579 \ 580 product(bool, MaxFDLimit, true, \ 581 "Bump the number of file descriptors to max in solaris.") \ 582 \ 583 notproduct(bool, LogEvents, trueInDebug, \ 584 "Enable Event log") \ 585 \ 586 product(bool, BytecodeVerificationRemote, true, \ 587 "Enables the Java bytecode verifier for remote classes") \ 588 \ 589 product(bool, BytecodeVerificationLocal, false, \ 590 "Enables the Java bytecode verifier for local classes") \ 591 \ 592 develop(bool, ForceFloatExceptions, trueInDebug, \ 593 "Force exceptions on FP stack under/overflow") \ 594 \ 595 develop(bool, SoftMatchFailure, trueInProduct, \ 596 "If the DFA fails to match a node, print a message and bail out") \ 597 \ 598 develop(bool, VerifyStackAtCalls, false, \ 599 "Verify that the stack pointer is unchanged after calls") \ 600 \ 601 develop(bool, TraceJavaAssertions, false, \ 602 "Trace java language assertions") \ 603 \ 604 notproduct(bool, CheckAssertionStatusDirectives, false, \ 605 "temporary - see javaClasses.cpp") \ 606 \ 607 notproduct(bool, PrintMallocFree, false, \ 608 "Trace calls to C heap malloc/free allocation") \ 609 \ 610 product(bool, PrintOopAddress, false, \ 611 "Always print the location of the oop") \ 612 \ 613 notproduct(bool, VerifyCodeCacheOften, false, \ 614 "Verify compiled-code cache often") \ 615 \ 616 develop(bool, ZapDeadCompiledLocals, false, \ 617 "Zap dead locals in compiler frames") \ 618 \ 619 notproduct(bool, ZapDeadLocalsOld, false, \ 620 "Zap dead locals (old version, zaps all frames when " \ 621 "entering the VM") \ 622 \ 623 notproduct(bool, CheckOopishValues, false, \ 624 "Warn if value contains oop ( requires ZapDeadLocals)") \ 625 \ 626 develop(bool, UseMallocOnly, false, \ 627 "use only malloc/free for allocation (no resource area/arena)") \ 628 \ 629 develop(bool, PrintMalloc, false, \ 630 "print all malloc/free calls") \ 631 \ 632 develop(bool, ZapResourceArea, trueInDebug, \ 633 "Zap freed resource/arena space with 0xABABABAB") \ 634 \ 635 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 636 "Zap freed VM handle space with 0xBCBCBCBC") \ 637 \ 638 develop(bool, ZapJNIHandleArea, trueInDebug, \ 639 "Zap freed JNI handle space with 0xFEFEFEFE") \ 640 \ 641 notproduct(bool, ZapStackSegments, trueInDebug, \ 642 "Zap allocated/freed Stack segments with 0xFADFADED") \ 643 \ 644 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 645 "Zap unused heap space with 0xBAADBABE") \ 646 \ 647 develop(bool, TraceZapUnusedHeapArea, false, \ 648 "Trace zapping of unused heap space") \ 649 \ 650 develop(bool, CheckZapUnusedHeapArea, false, \ 651 "Check zapping of unused heap space") \ 652 \ 653 develop(bool, ZapFillerObjects, trueInDebug, \ 654 "Zap filler objects with 0xDEAFBABE") \ 655 \ 656 develop(bool, PrintVMMessages, true, \ 657 "Print vm messages on console") \ 658 \ 659 product(bool, PrintGCApplicationConcurrentTime, false, \ 660 "Print the time the application has been running") \ 661 \ 662 product(bool, PrintGCApplicationStoppedTime, false, \ 663 "Print the time the application has been stopped") \ 664 \ 665 notproduct(uintx, ErrorHandlerTest, 0, \ 666 "If > 0, provokes an error after VM initialization; the value" \ 667 "determines which error to provoke. See test_error_handler()" \ 668 "in debug.cpp.") \ 669 \ 670 develop(bool, Verbose, false, \ 671 "Prints additional debugging information from other modes") \ 672 \ 673 develop(bool, PrintMiscellaneous, false, \ 674 "Prints uncategorized debugging information (requires +Verbose)") \ 675 \ 676 develop(bool, WizardMode, false, \ 677 "Prints much more debugging information") \ 678 \ 679 product(bool, ShowMessageBoxOnError, false, \ 680 "Keep process alive on VM fatal error") \ 681 \ 682 product_pd(bool, UseOSErrorReporting, \ 683 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 684 \ 685 product(bool, SuppressFatalErrorMessage, false, \ 686 "Do NO Fatal Error report [Avoid deadlock]") \ 687 \ 688 product(ccstrlist, OnError, "", \ 689 "Run user-defined commands on fatal error; see VMError.cpp " \ 690 "for examples") \ 691 \ 692 product(ccstrlist, OnOutOfMemoryError, "", \ 693 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 694 \ 695 manageable(bool, HeapDumpBeforeFullGC, false, \ 696 "Dump heap to file before any major stop-world GC") \ 697 \ 698 manageable(bool, HeapDumpAfterFullGC, false, \ 699 "Dump heap to file after any major stop-world GC") \ 700 \ 701 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 702 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 703 \ 704 manageable(ccstr, HeapDumpPath, NULL, \ 705 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 706 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 707 "in the working directory)") \ 708 \ 709 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 710 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 711 "when the heap usage is larger than this") \ 712 \ 713 develop(uintx, HeapDumpSegmentSize, 1*G, \ 714 "Approximate segment size when generating a segmented heap dump") \ 715 \ 716 develop(bool, BreakAtWarning, false, \ 717 "Execute breakpoint upon encountering VM warning") \ 718 \ 719 product_pd(bool, UseVectoredExceptions, \ 720 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 721 \ 722 develop(bool, TraceVMOperation, false, \ 723 "Trace vm operations") \ 724 \ 725 develop(bool, UseFakeTimers, false, \ 726 "Tells whether the VM should use system time or a fake timer") \ 727 \ 728 diagnostic(bool, LogCompilation, false, \ 729 "Log compilation activity in detail to hotspot.log or LogFile") \ 730 \ 731 product(bool, PrintCompilation, false, \ 732 "Print compilations") \ 733 \ 734 diagnostic(bool, TraceNMethodInstalls, false, \ 735 "Trace nmethod intallation") \ 736 \ 737 diagnostic(intx, ScavengeRootsInCode, 0, \ 738 "0: do not allow scavengable oops in the code cache; " \ 739 "1: allow scavenging from the code cache; " \ 740 "2: emit as many constants as the compiler can see") \ 741 \ 742 diagnostic(bool, TraceOSRBreakpoint, false, \ 743 "Trace OSR Breakpoint ") \ 744 \ 745 diagnostic(bool, TraceCompileTriggered, false, \ 746 "Trace compile triggered") \ 747 \ 748 diagnostic(bool, TraceTriggers, false, \ 749 "Trace triggers") \ 750 \ 751 product(bool, AlwaysRestoreFPU, false, \ 752 "Restore the FPU control word after every JNI call (expensive)") \ 753 \ 754 notproduct(bool, PrintCompilation2, false, \ 755 "Print additional statistics per compilation") \ 756 \ 757 diagnostic(bool, PrintAdapterHandlers, false, \ 758 "Print code generated for i2c/c2i adapters") \ 759 \ 760 develop(bool, VerifyAdapterSharing, false, \ 761 "Verify that the code for shared adapters is the equivalent") \ 762 \ 763 diagnostic(bool, PrintAssembly, false, \ 764 "Print assembly code (using external disassembler.so)") \ 765 \ 766 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 767 "Options string passed to disassembler.so") \ 768 \ 769 diagnostic(bool, PrintNMethods, false, \ 770 "Print assembly code for nmethods when generated") \ 771 \ 772 diagnostic(bool, PrintNativeNMethods, false, \ 773 "Print assembly code for native nmethods when generated") \ 774 \ 775 develop(bool, PrintDebugInfo, false, \ 776 "Print debug information for all nmethods when generated") \ 777 \ 778 develop(bool, PrintRelocations, false, \ 779 "Print relocation information for all nmethods when generated") \ 780 \ 781 develop(bool, PrintDependencies, false, \ 782 "Print dependency information for all nmethods when generated") \ 783 \ 784 develop(bool, PrintExceptionHandlers, false, \ 785 "Print exception handler tables for all nmethods when generated") \ 786 \ 787 develop(bool, InterceptOSException, false, \ 788 "Starts debugger when an implicit OS (e.g., NULL) " \ 789 "exception happens") \ 790 \ 791 notproduct(bool, PrintCodeCache, false, \ 792 "Print the compiled_code cache when exiting") \ 793 \ 794 develop(bool, PrintCodeCache2, false, \ 795 "Print detailed info on the compiled_code cache when exiting") \ 796 \ 797 diagnostic(bool, PrintStubCode, false, \ 798 "Print generated stub code") \ 799 \ 800 product(bool, StackTraceInThrowable, true, \ 801 "Collect backtrace in throwable when exception happens") \ 802 \ 803 product(bool, OmitStackTraceInFastThrow, true, \ 804 "Omit backtraces for some 'hot' exceptions in optimized code") \ 805 \ 806 product(bool, ProfilerPrintByteCodeStatistics, false, \ 807 "Prints byte code statictics when dumping profiler output") \ 808 \ 809 product(bool, ProfilerRecordPC, false, \ 810 "Collects tick for each 16 byte interval of compiled code") \ 811 \ 812 product(bool, ProfileVM, false, \ 813 "Profiles ticks that fall within VM (either in the VM Thread " \ 814 "or VM code called through stubs)") \ 815 \ 816 product(bool, ProfileIntervals, false, \ 817 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 818 \ 819 notproduct(bool, ProfilerCheckIntervals, false, \ 820 "Collect and print info on spacing of profiler ticks") \ 821 \ 822 develop(bool, PrintJVMWarnings, false, \ 823 "Prints warnings for unimplemented JVM functions") \ 824 \ 825 product(bool, PrintWarnings, true, \ 826 "Prints JVM warnings to output stream") \ 827 \ 828 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 829 "Prints warnings for stalled SpinLocks") \ 830 \ 831 develop(bool, InitializeJavaLangSystem, true, \ 832 "Initialize java.lang.System - turn off for individual " \ 833 "method debugging") \ 834 \ 835 develop(bool, InitializeJavaLangString, true, \ 836 "Initialize java.lang.String - turn off for individual " \ 837 "method debugging") \ 838 \ 839 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 840 "Initialize various error and exception classes - turn off for " \ 841 "individual method debugging") \ 842 \ 843 product(bool, RegisterFinalizersAtInit, true, \ 844 "Register finalizable objects at end of Object.<init> or " \ 845 "after allocation") \ 846 \ 847 develop(bool, RegisterReferences, true, \ 848 "Tells whether the VM should register soft/weak/final/phantom " \ 849 "references") \ 850 \ 851 develop(bool, IgnoreRewrites, false, \ 852 "Supress rewrites of bytecodes in the oopmap generator. " \ 853 "This is unsafe!") \ 854 \ 855 develop(bool, PrintCodeCacheExtension, false, \ 856 "Print extension of code cache") \ 857 \ 858 develop(bool, UsePrivilegedStack, true, \ 859 "Enable the security JVM functions") \ 860 \ 861 develop(bool, IEEEPrecision, true, \ 862 "Enables IEEE precision (for INTEL only)") \ 863 \ 864 develop(bool, ProtectionDomainVerification, true, \ 865 "Verifies protection domain before resolution in system " \ 866 "dictionary") \ 867 \ 868 product(bool, ClassUnloading, true, \ 869 "Do unloading of classes") \ 870 \ 871 diagnostic(bool, LinkWellKnownClasses, false, \ 872 "Resolve a well known class as soon as its name is seen") \ 873 \ 874 develop(bool, DisableStartThread, false, \ 875 "Disable starting of additional Java threads " \ 876 "(for debugging only)") \ 877 \ 878 develop(bool, MemProfiling, false, \ 879 "Write memory usage profiling to log file") \ 880 \ 881 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 882 "Prints the system dictionary at exit") \ 883 \ 884 diagnostic(bool, UnsyncloadClass, false, \ 885 "Unstable: VM calls loadClass unsynchronized. Custom " \ 886 "class loader must call VM synchronized for findClass " \ 887 "and defineClass.") \ 888 \ 889 product(bool, AlwaysLockClassLoader, false, \ 890 "Require the VM to acquire the class loader lock before calling " \ 891 "loadClass() even for class loaders registering " \ 892 "as parallel capable") \ 893 \ 894 product(bool, AllowParallelDefineClass, false, \ 895 "Allow parallel defineClass requests for class loaders " \ 896 "registering as parallel capable") \ 897 \ 898 product(bool, MustCallLoadClassInternal, false, \ 899 "Call loadClassInternal() rather than loadClass()") \ 900 \ 901 product_pd(bool, DontYieldALot, \ 902 "Throw away obvious excess yield calls (for SOLARIS only)") \ 903 \ 904 product_pd(bool, ConvertSleepToYield, \ 905 "Converts sleep(0) to thread yield " \ 906 "(may be off for SOLARIS to improve GUI)") \ 907 \ 908 product(bool, ConvertYieldToSleep, false, \ 909 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 910 "behavior (SOLARIS only)") \ 911 \ 912 product(bool, UseBoundThreads, true, \ 913 "Bind user level threads to kernel threads (for SOLARIS only)") \ 914 \ 915 develop(bool, UseDetachedThreads, true, \ 916 "Use detached threads that are recycled upon termination " \ 917 "(for SOLARIS only)") \ 918 \ 919 product(bool, UseLWPSynchronization, true, \ 920 "Use LWP-based instead of libthread-based synchronization " \ 921 "(SPARC only)") \ 922 \ 923 product(ccstr, SyncKnobs, NULL, \ 924 "(Unstable) Various monitor synchronization tunables") \ 925 \ 926 product(intx, EmitSync, 0, \ 927 "(Unsafe,Unstable) " \ 928 " Controls emission of inline sync fast-path code") \ 929 \ 930 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 931 \ 932 product(intx, MonitorBound, 0, "Bound Monitor population") \ 933 \ 934 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 935 \ 936 product(intx, Atomics, 0, \ 937 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 938 \ 939 product(intx, FenceInstruction, 0, \ 940 "(Unsafe,Unstable) Experimental") \ 941 \ 942 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 943 \ 944 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 945 \ 946 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 947 \ 948 product(intx, hashCode, 0, \ 949 "(Unstable) select hashCode generation algorithm" ) \ 950 \ 951 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 952 "(Unstable, Linux-specific)" \ 953 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 954 \ 955 product(bool, FilterSpuriousWakeups, true, \ 956 "Prevent spurious or premature wakeups from object.wait " \ 957 "(Solaris only)") \ 958 \ 959 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 960 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 961 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 962 \ 963 develop(bool, UsePthreads, false, \ 964 "Use pthread-based instead of libthread-based synchronization " \ 965 "(SPARC only)") \ 966 \ 967 product(bool, AdjustConcurrency, false, \ 968 "call thr_setconcurrency at thread create time to avoid " \ 969 "LWP starvation on MP systems (For Solaris Only)") \ 970 \ 971 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 972 "Should the system attempt to update the compiler file when " \ 973 "an error occurs?") \ 974 \ 975 product(bool, ReduceSignalUsage, false, \ 976 "Reduce the use of OS signals in Java and/or the VM") \ 977 \ 978 notproduct(bool, ValidateMarkSweep, false, \ 979 "Do extra validation during MarkSweep collection") \ 980 \ 981 notproduct(bool, RecordMarkSweepCompaction, false, \ 982 "Enable GC-to-GC recording and querying of compaction during " \ 983 "MarkSweep") \ 984 \ 985 develop_pd(bool, ShareVtableStubs, \ 986 "Share vtable stubs (smaller code but worse branch prediction") \ 987 \ 988 develop(bool, LoadLineNumberTables, true, \ 989 "Tells whether the class file parser loads line number tables") \ 990 \ 991 develop(bool, LoadLocalVariableTables, true, \ 992 "Tells whether the class file parser loads local variable tables")\ 993 \ 994 develop(bool, LoadLocalVariableTypeTables, true, \ 995 "Tells whether the class file parser loads local variable type tables")\ 996 \ 997 product(bool, AllowUserSignalHandlers, false, \ 998 "Do not complain if the application installs signal handlers " \ 999 "(Solaris & Linux only)") \ 1000 \ 1001 product(bool, UseSignalChaining, true, \ 1002 "Use signal-chaining to invoke signal handlers installed " \ 1003 "by the application (Solaris & Linux only)") \ 1004 \ 1005 product(bool, UseAltSigs, false, \ 1006 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1007 "internal signals (Solaris only)") \ 1008 \ 1009 product(bool, UseSpinning, false, \ 1010 "Use spinning in monitor inflation and before entry") \ 1011 \ 1012 product(bool, PreSpinYield, false, \ 1013 "Yield before inner spinning loop") \ 1014 \ 1015 product(bool, PostSpinYield, true, \ 1016 "Yield after inner spinning loop") \ 1017 \ 1018 product(bool, AllowJNIEnvProxy, false, \ 1019 "Allow JNIEnv proxies for jdbx") \ 1020 \ 1021 product(bool, JNIDetachReleasesMonitors, true, \ 1022 "JNI DetachCurrentThread releases monitors owned by thread") \ 1023 \ 1024 product(bool, RestoreMXCSROnJNICalls, false, \ 1025 "Restore MXCSR when returning from JNI calls") \ 1026 \ 1027 product(bool, CheckJNICalls, false, \ 1028 "Verify all arguments to JNI calls") \ 1029 \ 1030 product(bool, UseFastJNIAccessors, true, \ 1031 "Use optimized versions of Get<Primitive>Field") \ 1032 \ 1033 product(bool, EagerXrunInit, false, \ 1034 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1035 " but not all -Xrun libraries may support the state of the VM at this time") \ 1036 \ 1037 product(bool, PreserveAllAnnotations, false, \ 1038 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1039 \ 1040 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1041 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1042 \ 1043 product(bool, LazyBootClassLoader, true, \ 1044 "Enable/disable lazy opening of boot class path entries") \ 1045 \ 1046 diagnostic(bool, UseIncDec, true, \ 1047 "Use INC, DEC instructions on x86") \ 1048 \ 1049 product(bool, UseNewLongLShift, false, \ 1050 "Use optimized bitwise shift left") \ 1051 \ 1052 product(bool, UseStoreImmI16, true, \ 1053 "Use store immediate 16-bits value instruction on x86") \ 1054 \ 1055 product(bool, UseAddressNop, false, \ 1056 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1057 \ 1058 product(bool, UseXmmLoadAndClearUpper, true, \ 1059 "Load low part of XMM register and clear upper part") \ 1060 \ 1061 product(bool, UseXmmRegToRegMoveAll, false, \ 1062 "Copy all XMM register bits when moving value between registers") \ 1063 \ 1064 product(bool, UseXmmI2D, false, \ 1065 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1066 \ 1067 product(bool, UseXmmI2F, false, \ 1068 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1069 \ 1070 product(bool, UseXMMForArrayCopy, false, \ 1071 "Use SSE2 MOVQ instruction for Arraycopy") \ 1072 \ 1073 product(bool, UseUnalignedLoadStores, false, \ 1074 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1075 \ 1076 product(intx, FieldsAllocationStyle, 1, \ 1077 "0 - type based with oops first, 1 - with oops last, " \ 1078 "2 - oops in super and sub classes are together") \ 1079 \ 1080 product(bool, CompactFields, true, \ 1081 "Allocate nonstatic fields in gaps between previous fields") \ 1082 \ 1083 notproduct(bool, PrintCompactFieldsSavings, false, \ 1084 "Print how many words were saved with CompactFields") \ 1085 \ 1086 product(bool, UseBiasedLocking, true, \ 1087 "Enable biased locking in JVM") \ 1088 \ 1089 product(intx, BiasedLockingStartupDelay, 4000, \ 1090 "Number of milliseconds to wait before enabling biased locking") \ 1091 \ 1092 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1093 "Print statistics of biased locking in JVM") \ 1094 \ 1095 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1096 "Threshold of number of revocations per type to try to " \ 1097 "rebias all objects in the heap of that type") \ 1098 \ 1099 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1100 "Threshold of number of revocations per type to permanently " \ 1101 "revoke biases of all objects in the heap of that type") \ 1102 \ 1103 product(intx, BiasedLockingDecayTime, 25000, \ 1104 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1105 "type after previous bulk rebias") \ 1106 \ 1107 /* tracing */ \ 1108 \ 1109 notproduct(bool, TraceRuntimeCalls, false, \ 1110 "Trace run-time calls") \ 1111 \ 1112 develop(bool, TraceJNICalls, false, \ 1113 "Trace JNI calls") \ 1114 \ 1115 notproduct(bool, TraceJVMCalls, false, \ 1116 "Trace JVM calls") \ 1117 \ 1118 product(ccstr, TraceJVMTI, NULL, \ 1119 "Trace flags for JVMTI functions and events") \ 1120 \ 1121 product(bool, ForceFullGCJVMTIEpilogues, false, \ 1122 "Force 'Full GC' was done semantics for JVMTI GC epilogues") \ 1123 \ 1124 /* This option can change an EMCP method into an obsolete method. */ \ 1125 /* This can affect tests that except specific methods to be EMCP. */ \ 1126 /* This option should be used with caution. */ \ 1127 product(bool, StressLdcRewrite, false, \ 1128 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1129 \ 1130 product(intx, TraceRedefineClasses, 0, \ 1131 "Trace level for JVMTI RedefineClasses") \ 1132 \ 1133 develop(bool, StressMethodComparator, false, \ 1134 "run the MethodComparator on all loaded methods") \ 1135 \ 1136 /* change to false by default sometime after Mustang */ \ 1137 product(bool, VerifyMergedCPBytecodes, true, \ 1138 "Verify bytecodes after RedefineClasses constant pool merging") \ 1139 \ 1140 develop(bool, TraceJNIHandleAllocation, false, \ 1141 "Trace allocation/deallocation of JNI handle blocks") \ 1142 \ 1143 develop(bool, TraceThreadEvents, false, \ 1144 "Trace all thread events") \ 1145 \ 1146 develop(bool, TraceBytecodes, false, \ 1147 "Trace bytecode execution") \ 1148 \ 1149 develop(bool, TraceClassInitialization, false, \ 1150 "Trace class initialization") \ 1151 \ 1152 develop(bool, TraceExceptions, false, \ 1153 "Trace exceptions") \ 1154 \ 1155 develop(bool, TraceICs, false, \ 1156 "Trace inline cache changes") \ 1157 \ 1158 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1159 "Trace method invocation counter overflow") \ 1160 \ 1161 develop(bool, TraceInlineCacheClearing, false, \ 1162 "Trace clearing of inline caches in nmethods") \ 1163 \ 1164 develop(bool, TraceDependencies, false, \ 1165 "Trace dependencies") \ 1166 \ 1167 develop(bool, VerifyDependencies, trueInDebug, \ 1168 "Exercise and verify the compilation dependency mechanism") \ 1169 \ 1170 develop(bool, TraceNewOopMapGeneration, false, \ 1171 "Trace OopMapGeneration") \ 1172 \ 1173 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1174 "Trace OopMapGeneration: print detailed cell states") \ 1175 \ 1176 develop(bool, TimeOopMap, false, \ 1177 "Time calls to GenerateOopMap::compute_map() in sum") \ 1178 \ 1179 develop(bool, TimeOopMap2, false, \ 1180 "Time calls to GenerateOopMap::compute_map() individually") \ 1181 \ 1182 develop(bool, TraceMonitorMismatch, false, \ 1183 "Trace monitor matching failures during OopMapGeneration") \ 1184 \ 1185 develop(bool, TraceOopMapRewrites, false, \ 1186 "Trace rewritting of method oops during oop map generation") \ 1187 \ 1188 develop(bool, TraceSafepoint, false, \ 1189 "Trace safepoint operations") \ 1190 \ 1191 develop(bool, TraceICBuffer, false, \ 1192 "Trace usage of IC buffer") \ 1193 \ 1194 develop(bool, TraceCompiledIC, false, \ 1195 "Trace changes of compiled IC") \ 1196 \ 1197 notproduct(bool, TraceZapDeadLocals, false, \ 1198 "Trace zapping dead locals") \ 1199 \ 1200 develop(bool, TraceStartupTime, false, \ 1201 "Trace setup time") \ 1202 \ 1203 develop(bool, TraceHPI, false, \ 1204 "Trace Host Porting Interface (HPI)") \ 1205 \ 1206 product(ccstr, HPILibPath, NULL, \ 1207 "Specify alternate path to HPI library") \ 1208 \ 1209 develop(bool, TraceProtectionDomainVerification, false, \ 1210 "Trace protection domain verifcation") \ 1211 \ 1212 develop(bool, TraceClearedExceptions, false, \ 1213 "Prints when an exception is forcibly cleared") \ 1214 \ 1215 product(bool, TraceClassResolution, false, \ 1216 "Trace all constant pool resolutions (for debugging)") \ 1217 \ 1218 product(bool, TraceBiasedLocking, false, \ 1219 "Trace biased locking in JVM") \ 1220 \ 1221 product(bool, TraceMonitorInflation, false, \ 1222 "Trace monitor inflation in JVM") \ 1223 \ 1224 /* assembler */ \ 1225 product(bool, Use486InstrsOnly, false, \ 1226 "Use 80486 Compliant instruction subset") \ 1227 \ 1228 /* gc */ \ 1229 \ 1230 product(bool, UseSerialGC, false, \ 1231 "Use the serial garbage collector") \ 1232 \ 1233 product(bool, UseG1GC, false, \ 1234 "Use the Garbage-First garbage collector") \ 1235 \ 1236 product(bool, UseParallelGC, false, \ 1237 "Use the Parallel Scavenge garbage collector") \ 1238 \ 1239 product(bool, UseParallelOldGC, false, \ 1240 "Use the Parallel Old garbage collector") \ 1241 \ 1242 product(bool, UseParallelOldGCCompacting, true, \ 1243 "In the Parallel Old garbage collector use parallel compaction") \ 1244 \ 1245 product(bool, UseParallelDensePrefixUpdate, true, \ 1246 "In the Parallel Old garbage collector use parallel dense" \ 1247 " prefix update") \ 1248 \ 1249 product(uintx, HeapMaximumCompactionInterval, 20, \ 1250 "How often should we maximally compact the heap (not allowing " \ 1251 "any dead space)") \ 1252 \ 1253 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1254 "The collection count for the first maximum compaction") \ 1255 \ 1256 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1257 "In the Parallel Old garbage collector maximum compaction for " \ 1258 "a system GC") \ 1259 \ 1260 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1261 "The mean used by the par compact dead wood" \ 1262 "limiter (a number between 0-100).") \ 1263 \ 1264 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1265 "The standard deviation used by the par compact dead wood" \ 1266 "limiter (a number between 0-100).") \ 1267 \ 1268 product(bool, UseParallelOldGCDensePrefix, true, \ 1269 "Use a dense prefix with the Parallel Old garbage collector") \ 1270 \ 1271 product(uintx, ParallelGCThreads, 0, \ 1272 "Number of parallel threads parallel gc will use") \ 1273 \ 1274 develop(bool, ParallelOldGCSplitALot, false, \ 1275 "Provoke splitting (copying data from a young gen space to" \ 1276 "multiple destination spaces)") \ 1277 \ 1278 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1279 "How often to provoke splitting a young gen space") \ 1280 \ 1281 develop(bool, TraceRegionTasksQueuing, false, \ 1282 "Trace the queuing of the region tasks") \ 1283 \ 1284 product(uintx, ConcGCThreads, 0, \ 1285 "Number of threads concurrent gc will use") \ 1286 \ 1287 product(uintx, YoungPLABSize, 4096, \ 1288 "Size of young gen promotion labs (in HeapWords)") \ 1289 \ 1290 product(uintx, OldPLABSize, 1024, \ 1291 "Size of old gen promotion labs (in HeapWords)") \ 1292 \ 1293 product(uintx, GCTaskTimeStampEntries, 200, \ 1294 "Number of time stamp entries per gc worker thread") \ 1295 \ 1296 product(bool, AlwaysTenure, false, \ 1297 "Always tenure objects in eden. (ParallelGC only)") \ 1298 \ 1299 product(bool, NeverTenure, false, \ 1300 "Never tenure objects in eden, May tenure on overflow " \ 1301 "(ParallelGC only)") \ 1302 \ 1303 product(bool, ScavengeBeforeFullGC, true, \ 1304 "Scavenge youngest generation before each full GC, " \ 1305 "used with UseParallelGC") \ 1306 \ 1307 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1308 "Allow scavenges to occur when to_space contains objects.") \ 1309 \ 1310 product(bool, UseConcMarkSweepGC, false, \ 1311 "Use Concurrent Mark-Sweep GC in the old generation") \ 1312 \ 1313 product(bool, ExplicitGCInvokesConcurrent, false, \ 1314 "A System.gc() request invokes a concurrent collection;" \ 1315 " (effective only when UseConcMarkSweepGC)") \ 1316 \ 1317 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1318 "A System.gc() request invokes a concurrent collection and " \ 1319 "also unloads classes during such a concurrent gc cycle " \ 1320 "(effective only when UseConcMarkSweepGC)") \ 1321 \ 1322 product(bool, GCLockerInvokesConcurrent, false, \ 1323 "The exit of a JNI CS necessitating a scavenge also" \ 1324 " kicks off a bkgrd concurrent collection") \ 1325 \ 1326 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1327 "Use Adaptive Free Lists in the CMS generation") \ 1328 \ 1329 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1330 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1331 \ 1332 develop(bool, RotateCMSCollectionTypes, false, \ 1333 "Rotate the CMS collections among concurrent and STW") \ 1334 \ 1335 product(bool, UseCMSBestFit, true, \ 1336 "Use CMS best fit allocation strategy") \ 1337 \ 1338 product(bool, UseCMSCollectionPassing, true, \ 1339 "Use passing of collection from background to foreground") \ 1340 \ 1341 product(bool, UseParNewGC, false, \ 1342 "Use parallel threads in the new generation.") \ 1343 \ 1344 product(bool, ParallelGCVerbose, false, \ 1345 "Verbose output for parallel GC.") \ 1346 \ 1347 product(intx, ParallelGCBufferWastePct, 10, \ 1348 "wasted fraction of parallel allocation buffer.") \ 1349 \ 1350 product(bool, ParallelGCRetainPLAB, true, \ 1351 "Retain parallel allocation buffers across scavenges.") \ 1352 \ 1353 product(intx, TargetPLABWastePct, 10, \ 1354 "target wasted space in last buffer as pct of overall allocation")\ 1355 \ 1356 product(uintx, PLABWeight, 75, \ 1357 "Percentage (0-100) used to weight the current sample when" \ 1358 "computing exponentially decaying average for ResizePLAB.") \ 1359 \ 1360 product(bool, ResizePLAB, true, \ 1361 "Dynamically resize (survivor space) promotion labs") \ 1362 \ 1363 product(bool, PrintPLAB, false, \ 1364 "Print (survivor space) promotion labs sizing decisions") \ 1365 \ 1366 product(intx, ParGCArrayScanChunk, 50, \ 1367 "Scan a subset and push remainder, if array is bigger than this") \ 1368 \ 1369 product(bool, ParGCUseLocalOverflow, false, \ 1370 "Instead of a global overflow list, use local overflow stacks") \ 1371 \ 1372 product(bool, ParGCTrimOverflow, true, \ 1373 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1374 \ 1375 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1376 "Whether we should simulate work queue overflow in ParNew") \ 1377 \ 1378 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1379 "An `interval' counter that determines how frequently " \ 1380 "we simulate overflow; a smaller number increases frequency") \ 1381 \ 1382 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1383 "The desired number of objects to claim from the overflow list") \ 1384 \ 1385 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1386 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1387 "parallel GC.") \ 1388 \ 1389 product(uintx, OldPLABWeight, 50, \ 1390 "Percentage (0-100) used to weight the current sample when" \ 1391 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1392 \ 1393 product(bool, ResizeOldPLAB, true, \ 1394 "Dynamically resize (old gen) promotion labs") \ 1395 \ 1396 product(bool, PrintOldPLAB, false, \ 1397 "Print (old gen) promotion labs sizing decisions") \ 1398 \ 1399 product(uintx, CMSOldPLABMin, 16, \ 1400 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1401 \ 1402 product(uintx, CMSOldPLABMax, 1024, \ 1403 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1404 \ 1405 product(uintx, CMSOldPLABNumRefills, 4, \ 1406 "Nominal number of refills of CMS gen promotion lab cache" \ 1407 " per worker per block size") \ 1408 \ 1409 product(bool, CMSOldPLABResizeQuicker, false, \ 1410 "Whether to react on-the-fly during a scavenge to a sudden" \ 1411 " change in block demand rate") \ 1412 \ 1413 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1414 "The tolerance of the phase-change detector for on-the-fly" \ 1415 " PLAB resizing during a scavenge") \ 1416 \ 1417 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1418 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1419 " during a scavenge") \ 1420 \ 1421 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1422 "The clamping of the gain in the feedback loop for on-the-fly" \ 1423 " PLAB resizing during a scavenge") \ 1424 \ 1425 product(bool, AlwaysPreTouch, false, \ 1426 "It forces all freshly committed pages to be pre-touched.") \ 1427 \ 1428 product(bool, CMSUseOldDefaults, false, \ 1429 "A flag temporarily introduced to allow reverting to some " \ 1430 "older default settings; older as of 6.0") \ 1431 \ 1432 product(intx, CMSYoungGenPerWorker, 16*M, \ 1433 "The amount of young gen chosen by default per GC worker " \ 1434 "thread available") \ 1435 \ 1436 product(bool, GCOverheadReporting, false, \ 1437 "Enables the GC overhead reporting facility") \ 1438 \ 1439 product(intx, GCOverheadReportingPeriodMS, 100, \ 1440 "Reporting period for conc GC overhead reporting, in ms ") \ 1441 \ 1442 product(bool, CMSIncrementalMode, false, \ 1443 "Whether CMS GC should operate in \"incremental\" mode") \ 1444 \ 1445 product(uintx, CMSIncrementalDutyCycle, 10, \ 1446 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1447 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1448 "value") \ 1449 \ 1450 product(bool, CMSIncrementalPacing, true, \ 1451 "Whether the CMS incremental mode duty cycle should be " \ 1452 "automatically adjusted") \ 1453 \ 1454 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1455 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1456 "enabled (a percentage, 0-100)") \ 1457 \ 1458 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1459 "Percentage (0-100) used to add conservatism when computing the " \ 1460 "duty cycle") \ 1461 \ 1462 product(uintx, CMSIncrementalOffset, 0, \ 1463 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1464 " is shifted to the right within the period between young GCs") \ 1465 \ 1466 product(uintx, CMSExpAvgFactor, 50, \ 1467 "Percentage (0-100) used to weight the current sample when" \ 1468 "computing exponential averages for CMS statistics.") \ 1469 \ 1470 product(uintx, CMS_FLSWeight, 75, \ 1471 "Percentage (0-100) used to weight the current sample when" \ 1472 "computing exponentially decating averages for CMS FLS statistics.") \ 1473 \ 1474 product(uintx, CMS_FLSPadding, 1, \ 1475 "The multiple of deviation from mean to use for buffering" \ 1476 "against volatility in free list demand.") \ 1477 \ 1478 product(uintx, FLSCoalescePolicy, 2, \ 1479 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1480 \ 1481 product(bool, FLSAlwaysCoalesceLarge, false, \ 1482 "CMS: Larger free blocks are always available for coalescing") \ 1483 \ 1484 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1485 "CMS: the smaller the percentage the greater the coalition force")\ 1486 \ 1487 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1488 "CMS: the factor by which to inflate estimated demand of small" \ 1489 " block sizes to prevent coalescing with an adjoining block") \ 1490 \ 1491 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1492 "CMS: the factor by which to inflate estimated demand of large" \ 1493 " block sizes to prevent coalescing with an adjoining block") \ 1494 \ 1495 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1496 "CMS: the factor by which to inflate estimated demand of small" \ 1497 " block sizes to prevent splitting to supply demand for smaller" \ 1498 " blocks") \ 1499 \ 1500 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1501 "CMS: the factor by which to inflate estimated demand of large" \ 1502 " block sizes to prevent splitting to supply demand for smaller" \ 1503 " blocks") \ 1504 \ 1505 product(bool, CMSExtrapolateSweep, false, \ 1506 "CMS: cushion for block demand during sweep") \ 1507 \ 1508 product(uintx, CMS_SweepWeight, 75, \ 1509 "Percentage (0-100) used to weight the current sample when " \ 1510 "computing exponentially decaying average for inter-sweep " \ 1511 "duration") \ 1512 \ 1513 product(uintx, CMS_SweepPadding, 1, \ 1514 "The multiple of deviation from mean to use for buffering " \ 1515 "against volatility in inter-sweep duration.") \ 1516 \ 1517 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1518 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1519 "duration exceeds this threhold in milliseconds") \ 1520 \ 1521 develop(bool, CMSTraceIncrementalMode, false, \ 1522 "Trace CMS incremental mode") \ 1523 \ 1524 develop(bool, CMSTraceIncrementalPacing, false, \ 1525 "Trace CMS incremental mode pacing computation") \ 1526 \ 1527 develop(bool, CMSTraceThreadState, false, \ 1528 "Trace the CMS thread state (enable the trace_state() method)") \ 1529 \ 1530 product(bool, CMSClassUnloadingEnabled, false, \ 1531 "Whether class unloading enabled when using CMS GC") \ 1532 \ 1533 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1534 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1535 " for which classes may not be unloaded") \ 1536 \ 1537 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1538 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1539 \ 1540 product(bool, UseCMSCompactAtFullCollection, true, \ 1541 "Use mark sweep compact at full collections") \ 1542 \ 1543 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1544 "Number of CMS full collection done before compaction if > 0") \ 1545 \ 1546 develop(intx, CMSDictionaryChoice, 0, \ 1547 "Use BinaryTreeDictionary as default in the CMS generation") \ 1548 \ 1549 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1550 "Replenish an indexed free list with this number of chunks") \ 1551 \ 1552 product(bool, CMSReplenishIntermediate, true, \ 1553 "Replenish all intermediate free-list caches") \ 1554 \ 1555 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1556 "When satisfying batched demand, split blocks from the " \ 1557 "IndexedFreeList whose size is a multiple of requested size") \ 1558 \ 1559 product(bool, CMSLoopWarn, false, \ 1560 "Warn in case of excessive CMS looping") \ 1561 \ 1562 develop(bool, CMSOverflowEarlyRestoration, false, \ 1563 "Whether preserved marks should be restored early") \ 1564 \ 1565 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1566 "Size of marking stack") \ 1567 \ 1568 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1569 "Max size of marking stack") \ 1570 \ 1571 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1572 "Whether we should simulate frequent marking stack / work queue" \ 1573 " overflow") \ 1574 \ 1575 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1576 "An `interval' counter that determines how frequently" \ 1577 " we simulate overflow; a smaller number increases frequency") \ 1578 \ 1579 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1580 "(Temporary, subject to experimentation)" \ 1581 "Maximum number of abortable preclean iterations, if > 0") \ 1582 \ 1583 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1584 "(Temporary, subject to experimentation)" \ 1585 "Maximum time in abortable preclean in ms") \ 1586 \ 1587 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1588 "(Temporary, subject to experimentation)" \ 1589 "Nominal minimum work per abortable preclean iteration") \ 1590 \ 1591 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1592 "(Temporary, subject to experimentation)" \ 1593 " Time that we sleep between iterations when not given" \ 1594 " enough work per iteration") \ 1595 \ 1596 product(uintx, CMSRescanMultiple, 32, \ 1597 "Size (in cards) of CMS parallel rescan task") \ 1598 \ 1599 product(uintx, CMSConcMarkMultiple, 32, \ 1600 "Size (in cards) of CMS concurrent MT marking task") \ 1601 \ 1602 product(uintx, CMSRevisitStackSize, 1*M, \ 1603 "Size of CMS KlassKlass revisit stack") \ 1604 \ 1605 product(bool, CMSAbortSemantics, false, \ 1606 "Whether abort-on-overflow semantics is implemented") \ 1607 \ 1608 product(bool, CMSParallelRemarkEnabled, true, \ 1609 "Whether parallel remark enabled (only if ParNewGC)") \ 1610 \ 1611 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1612 "Whether parallel remark of survivor space" \ 1613 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1614 \ 1615 product(bool, CMSPLABRecordAlways, true, \ 1616 "Whether to always record survivor space PLAB bdries" \ 1617 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1618 \ 1619 product(bool, CMSConcurrentMTEnabled, true, \ 1620 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1621 \ 1622 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1623 "Whether concurrent precleaning enabled in perm gen" \ 1624 " (effective only when CMSPrecleaningEnabled is true)") \ 1625 \ 1626 product(bool, CMSPrecleaningEnabled, true, \ 1627 "Whether concurrent precleaning enabled") \ 1628 \ 1629 product(uintx, CMSPrecleanIter, 3, \ 1630 "Maximum number of precleaning iteration passes") \ 1631 \ 1632 product(uintx, CMSPrecleanNumerator, 2, \ 1633 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1634 " ratio") \ 1635 \ 1636 product(uintx, CMSPrecleanDenominator, 3, \ 1637 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1638 " ratio") \ 1639 \ 1640 product(bool, CMSPrecleanRefLists1, true, \ 1641 "Preclean ref lists during (initial) preclean phase") \ 1642 \ 1643 product(bool, CMSPrecleanRefLists2, false, \ 1644 "Preclean ref lists during abortable preclean phase") \ 1645 \ 1646 product(bool, CMSPrecleanSurvivors1, false, \ 1647 "Preclean survivors during (initial) preclean phase") \ 1648 \ 1649 product(bool, CMSPrecleanSurvivors2, true, \ 1650 "Preclean survivors during abortable preclean phase") \ 1651 \ 1652 product(uintx, CMSPrecleanThreshold, 1000, \ 1653 "Don't re-iterate if #dirty cards less than this") \ 1654 \ 1655 product(bool, CMSCleanOnEnter, true, \ 1656 "Clean-on-enter optimization for reducing number of dirty cards") \ 1657 \ 1658 product(uintx, CMSRemarkVerifyVariant, 1, \ 1659 "Choose variant (1,2) of verification following remark") \ 1660 \ 1661 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1662 "If Eden used is below this value, don't try to schedule remark") \ 1663 \ 1664 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1665 "The Eden occupancy % at which to try and schedule remark pause") \ 1666 \ 1667 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1668 "Start sampling Eden top at least before yg occupancy reaches" \ 1669 " 1/<ratio> of the size at which we plan to schedule remark") \ 1670 \ 1671 product(uintx, CMSSamplingGrain, 16*K, \ 1672 "The minimum distance between eden samples for CMS (see above)") \ 1673 \ 1674 product(bool, CMSScavengeBeforeRemark, false, \ 1675 "Attempt scavenge before the CMS remark step") \ 1676 \ 1677 develop(bool, CMSTraceSweeper, false, \ 1678 "Trace some actions of the CMS sweeper") \ 1679 \ 1680 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1681 "Don't drain below this size per parallel worker/thief") \ 1682 \ 1683 manageable(intx, CMSWaitDuration, 2000, \ 1684 "Time in milliseconds that CMS thread waits for young GC") \ 1685 \ 1686 product(bool, CMSYield, true, \ 1687 "Yield between steps of concurrent mark & sweep") \ 1688 \ 1689 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1690 "Bitmap operations should process at most this many bits" \ 1691 "between yields") \ 1692 \ 1693 product(bool, CMSDumpAtPromotionFailure, false, \ 1694 "Dump useful information about the state of the CMS old " \ 1695 " generation upon a promotion failure.") \ 1696 \ 1697 product(bool, CMSPrintChunksInDump, false, \ 1698 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1699 " more detailed information about the free chunks.") \ 1700 \ 1701 product(bool, CMSPrintObjectsInDump, false, \ 1702 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1703 " more detailed information about the allocated objects.") \ 1704 \ 1705 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1706 "Verify that all refs across the FLS boundary " \ 1707 " are to valid objects") \ 1708 \ 1709 diagnostic(bool, FLSVerifyLists, false, \ 1710 "Do lots of (expensive) FreeListSpace verification") \ 1711 \ 1712 diagnostic(bool, FLSVerifyIndexTable, false, \ 1713 "Do lots of (expensive) FLS index table verification") \ 1714 \ 1715 develop(bool, FLSVerifyDictionary, false, \ 1716 "Do lots of (expensive) FLS dictionary verification") \ 1717 \ 1718 develop(bool, VerifyBlockOffsetArray, false, \ 1719 "Do (expensive!) block offset array verification") \ 1720 \ 1721 product(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1722 "Maintain _unallocated_block in BlockOffsetArray" \ 1723 " (currently applicable only to CMS collector)") \ 1724 \ 1725 develop(bool, TraceCMSState, false, \ 1726 "Trace the state of the CMS collection") \ 1727 \ 1728 product(intx, RefDiscoveryPolicy, 0, \ 1729 "Whether reference-based(0) or referent-based(1)") \ 1730 \ 1731 product(bool, ParallelRefProcEnabled, false, \ 1732 "Enable parallel reference processing whenever possible") \ 1733 \ 1734 product(bool, ParallelRefProcBalancingEnabled, true, \ 1735 "Enable balancing of reference processing queues") \ 1736 \ 1737 product(intx, CMSTriggerRatio, 80, \ 1738 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1739 "allocated before a CMS collection cycle commences") \ 1740 \ 1741 product(intx, CMSTriggerPermRatio, 80, \ 1742 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1743 "is allocated before a CMS collection cycle commences, that " \ 1744 "also collects the perm generation") \ 1745 \ 1746 product(uintx, CMSBootstrapOccupancy, 50, \ 1747 "Percentage CMS generation occupancy at which to " \ 1748 "initiate CMS collection for bootstrapping collection stats") \ 1749 \ 1750 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1751 "Percentage CMS generation occupancy to start a CMS collection " \ 1752 "cycle. A negative value means that CMSTriggerRatio is used") \ 1753 \ 1754 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1755 "Percentage of the (entire) heap occupancy to start a " \ 1756 "concurrent GC cycle. It us used by GCs that trigger a " \ 1757 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1758 "not just one of the generations (e.g., G1). A value of 0 " \ 1759 "denotes 'do constant GC cycles'.") \ 1760 \ 1761 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1762 "Percentage CMS perm generation occupancy to start a " \ 1763 "CMScollection cycle. A negative value means that " \ 1764 "CMSTriggerPermRatio is used") \ 1765 \ 1766 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1767 "Only use occupancy as a crierion for starting a CMS collection") \ 1768 \ 1769 product(intx, CMSIsTooFullPercentage, 98, \ 1770 "An absolute ceiling above which CMS will always consider the " \ 1771 "perm gen ripe for collection") \ 1772 \ 1773 develop(bool, CMSTestInFreeList, false, \ 1774 "Check if the coalesced range is already in the " \ 1775 "free lists as claimed") \ 1776 \ 1777 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1778 "Check that all the garbage collected was returned to the " \ 1779 "free lists.") \ 1780 \ 1781 notproduct(bool, ScavengeALot, false, \ 1782 "Force scavenge at every Nth exit from the runtime system " \ 1783 "(N=ScavengeALotInterval)") \ 1784 \ 1785 develop(bool, FullGCALot, false, \ 1786 "Force full gc at every Nth exit from the runtime system " \ 1787 "(N=FullGCALotInterval)") \ 1788 \ 1789 notproduct(bool, GCALotAtAllSafepoints, false, \ 1790 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1791 \ 1792 product(bool, PrintPromotionFailure, false, \ 1793 "Print additional diagnostic information following " \ 1794 " promotion failure") \ 1795 \ 1796 notproduct(bool, PromotionFailureALot, false, \ 1797 "Use promotion failure handling on every youngest generation " \ 1798 "collection") \ 1799 \ 1800 develop(uintx, PromotionFailureALotCount, 1000, \ 1801 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1802 "refill attempts (ParNew) or promotion attempts " \ 1803 "(other young collectors) ") \ 1804 \ 1805 develop(uintx, PromotionFailureALotInterval, 5, \ 1806 "Total collections between promotion failures alot") \ 1807 \ 1808 experimental(intx, WorkStealingSleepMillis, 1, \ 1809 "Sleep time when sleep is used for yields") \ 1810 \ 1811 experimental(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1812 "Number of yields before a sleep is done during workstealing") \ 1813 \ 1814 experimental(uintx, WorkStealingHardSpins, 4096, \ 1815 "Number of iterations in a spin loop between checks on " \ 1816 "time out of hard spin") \ 1817 \ 1818 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1819 "Ratio of hard spins to calls to yield") \ 1820 \ 1821 product(uintx, PreserveMarkStackSize, 1024, \ 1822 "Size for stack used in promotion failure handling") \ 1823 \ 1824 develop(uintx, ObjArrayMarkingStride, 512, \ 1825 "Number of ObjArray elements to push onto the marking stack" \ 1826 "before pushing a continuation entry") \ 1827 \ 1828 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1829 \ 1830 product_pd(bool, ResizeTLAB, \ 1831 "Dynamically resize tlab size for threads") \ 1832 \ 1833 product(bool, ZeroTLAB, false, \ 1834 "Zero out the newly created TLAB") \ 1835 \ 1836 product(bool, FastTLABRefill, true, \ 1837 "Use fast TLAB refill code") \ 1838 \ 1839 product(bool, PrintTLAB, false, \ 1840 "Print various TLAB related information") \ 1841 \ 1842 product(bool, TLABStats, true, \ 1843 "Print various TLAB related information") \ 1844 \ 1845 product(bool, PrintRevisitStats, false, \ 1846 "Print revisit (klass and MDO) stack related information") \ 1847 \ 1848 product_pd(bool, NeverActAsServerClassMachine, \ 1849 "Never act like a server-class machine") \ 1850 \ 1851 product(bool, AlwaysActAsServerClassMachine, false, \ 1852 "Always act like a server-class machine") \ 1853 \ 1854 product_pd(uint64_t, MaxRAM, \ 1855 "Real memory size (in bytes) used to set maximum heap size") \ 1856 \ 1857 product(uintx, ErgoHeapSizeLimit, 0, \ 1858 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1859 "MaxRAM / MaxRAMFraction") \ 1860 \ 1861 product(uintx, MaxRAMFraction, 4, \ 1862 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1863 "size") \ 1864 \ 1865 product(uintx, DefaultMaxRAMFraction, 4, \ 1866 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1867 "size; deprecated: to be renamed to MaxRAMFraction") \ 1868 \ 1869 product(uintx, MinRAMFraction, 2, \ 1870 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1871 "size on systems with small physical memory size") \ 1872 \ 1873 product(uintx, InitialRAMFraction, 64, \ 1874 "Fraction (1/n) of real memory used for initial heap size") \ 1875 \ 1876 product(bool, UseAutoGCSelectPolicy, false, \ 1877 "Use automatic collection selection policy") \ 1878 \ 1879 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1880 "Automatic GC selection pause threshhold in ms") \ 1881 \ 1882 product(bool, UseAdaptiveSizePolicy, true, \ 1883 "Use adaptive generation sizing policies") \ 1884 \ 1885 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1886 "Use adaptive survivor sizing policies") \ 1887 \ 1888 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1889 "Use adaptive young-old sizing policies at minor collections") \ 1890 \ 1891 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1892 "Use adaptive young-old sizing policies at major collections") \ 1893 \ 1894 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1895 "Use statistics from System.GC for adaptive size policy") \ 1896 \ 1897 product(bool, UseAdaptiveGCBoundary, false, \ 1898 "Allow young-old boundary to move") \ 1899 \ 1900 develop(bool, TraceAdaptiveGCBoundary, false, \ 1901 "Trace young-old boundary moves") \ 1902 \ 1903 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1904 "Resize the virtual spaces of the young or old generations") \ 1905 \ 1906 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1907 "Policy for changeing generation size for throughput goals") \ 1908 \ 1909 product(uintx, AdaptiveSizePausePolicy, 0, \ 1910 "Policy for changing generation size for pause goals") \ 1911 \ 1912 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1913 "Adjust tenured generation to achive a minor pause goal") \ 1914 \ 1915 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1916 "Adjust young generation to achive a major pause goal") \ 1917 \ 1918 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1919 "Number of steps where heuristics is used before data is used") \ 1920 \ 1921 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1922 "Number of collections before the adaptive sizing is started") \ 1923 \ 1924 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1925 "Collecton interval for printing information; zero => never") \ 1926 \ 1927 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1928 "Use adaptive minimum footprint as a goal") \ 1929 \ 1930 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1931 "Weight given to exponential resizing, between 0 and 100") \ 1932 \ 1933 product(uintx, AdaptiveTimeWeight, 25, \ 1934 "Weight given to time in adaptive policy, between 0 and 100") \ 1935 \ 1936 product(uintx, PausePadding, 1, \ 1937 "How much buffer to keep for pause time") \ 1938 \ 1939 product(uintx, PromotedPadding, 3, \ 1940 "How much buffer to keep for promotion failure") \ 1941 \ 1942 product(uintx, SurvivorPadding, 3, \ 1943 "How much buffer to keep for survivor overflow") \ 1944 \ 1945 product(uintx, AdaptivePermSizeWeight, 20, \ 1946 "Weight for perm gen exponential resizing, between 0 and 100") \ 1947 \ 1948 product(uintx, PermGenPadding, 3, \ 1949 "How much buffer to keep for perm gen sizing") \ 1950 \ 1951 product(uintx, ThresholdTolerance, 10, \ 1952 "Allowed collection cost difference between generations") \ 1953 \ 1954 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1955 "If collection costs are within margin, reduce both by full " \ 1956 "delta") \ 1957 \ 1958 product(uintx, YoungGenerationSizeIncrement, 20, \ 1959 "Adaptive size percentage change in young generation") \ 1960 \ 1961 product(uintx, YoungGenerationSizeSupplement, 80, \ 1962 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1963 \ 1964 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1965 "Decay factor to YoungedGenerationSizeSupplement") \ 1966 \ 1967 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1968 "Adaptive size percentage change in tenured generation") \ 1969 \ 1970 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1971 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1972 \ 1973 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1974 "Decay factor to TenuredGenerationSizeIncrement") \ 1975 \ 1976 product(uintx, MaxGCPauseMillis, max_uintx, \ 1977 "Adaptive size policy maximum GC pause time goal in msec, " \ 1978 "or (G1 Only) the max. GC time per MMU time slice") \ 1979 \ 1980 product(uintx, GCPauseIntervalMillis, 0, \ 1981 "Time slice for MMU specification") \ 1982 \ 1983 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1984 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1985 \ 1986 product(uintx, GCTimeRatio, 99, \ 1987 "Adaptive size policy application time to GC time ratio") \ 1988 \ 1989 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1990 "Adaptive size scale down factor for shrinking") \ 1991 \ 1992 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1993 "Adaptive size decays the major cost for long major intervals") \ 1994 \ 1995 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1996 "Time scale over which major costs decay") \ 1997 \ 1998 product(uintx, MinSurvivorRatio, 3, \ 1999 "Minimum ratio of young generation/survivor space size") \ 2000 \ 2001 product(uintx, InitialSurvivorRatio, 8, \ 2002 "Initial ratio of eden/survivor space size") \ 2003 \ 2004 product(uintx, BaseFootPrintEstimate, 256*M, \ 2005 "Estimate of footprint other than Java Heap") \ 2006 \ 2007 product(bool, UseGCOverheadLimit, true, \ 2008 "Use policy to limit of proportion of time spent in GC " \ 2009 "before an OutOfMemory error is thrown") \ 2010 \ 2011 product(uintx, GCTimeLimit, 98, \ 2012 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2013 "error is thrown (used with GCHeapFreeLimit)") \ 2014 \ 2015 product(uintx, GCHeapFreeLimit, 2, \ 2016 "Minimum percentage of free space after a full GC before an " \ 2017 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2018 \ 2019 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2020 "Number of consecutive collections before gc time limit fires") \ 2021 \ 2022 product(bool, PrintAdaptiveSizePolicy, false, \ 2023 "Print information about AdaptiveSizePolicy") \ 2024 \ 2025 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2026 "How far ahead to prefetch destination area (<= 0 means off)") \ 2027 \ 2028 product(intx, PrefetchScanIntervalInBytes, -1, \ 2029 "How far ahead to prefetch scan area (<= 0 means off)") \ 2030 \ 2031 product(intx, PrefetchFieldsAhead, -1, \ 2032 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2033 \ 2034 develop(bool, UsePrefetchQueue, true, \ 2035 "Use the prefetch queue during PS promotion") \ 2036 \ 2037 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2038 "Verify system before exiting") \ 2039 \ 2040 diagnostic(bool, VerifyBeforeGC, false, \ 2041 "Verify memory system before GC") \ 2042 \ 2043 diagnostic(bool, VerifyAfterGC, false, \ 2044 "Verify memory system after GC") \ 2045 \ 2046 diagnostic(bool, VerifyDuringGC, false, \ 2047 "Verify memory system during GC (between phases)") \ 2048 \ 2049 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2050 "Enable parallel memory system verification") \ 2051 \ 2052 diagnostic(bool, DeferInitialCardMark, false, \ 2053 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2054 "may arise from new_pre_store_barrier") \ 2055 \ 2056 diagnostic(bool, VerifyRememberedSets, false, \ 2057 "Verify GC remembered sets") \ 2058 \ 2059 diagnostic(bool, VerifyObjectStartArray, true, \ 2060 "Verify GC object start array if verify before/after") \ 2061 \ 2062 product(bool, DisableExplicitGC, false, \ 2063 "Tells whether calling System.gc() does a full GC") \ 2064 \ 2065 notproduct(bool, CheckMemoryInitialization, false, \ 2066 "Checks memory initialization") \ 2067 \ 2068 product(bool, CollectGen0First, false, \ 2069 "Collect youngest generation before each full GC") \ 2070 \ 2071 diagnostic(bool, BindCMSThreadToCPU, false, \ 2072 "Bind CMS Thread to CPU if possible") \ 2073 \ 2074 diagnostic(uintx, CPUForCMSThread, 0, \ 2075 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2076 \ 2077 product(bool, BindGCTaskThreadsToCPUs, false, \ 2078 "Bind GCTaskThreads to CPUs if possible") \ 2079 \ 2080 product(bool, UseGCTaskAffinity, false, \ 2081 "Use worker affinity when asking for GCTasks") \ 2082 \ 2083 product(uintx, ProcessDistributionStride, 4, \ 2084 "Stride through processors when distributing processes") \ 2085 \ 2086 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2087 "number of times the coordinator GC thread will sleep while " \ 2088 "yielding before giving up and resuming GC") \ 2089 \ 2090 product(uintx, CMSYieldSleepCount, 0, \ 2091 "number of times a GC thread (minus the coordinator) " \ 2092 "will sleep while yielding before giving up and resuming GC") \ 2093 \ 2094 /* gc tracing */ \ 2095 manageable(bool, PrintGC, false, \ 2096 "Print message at garbage collect") \ 2097 \ 2098 manageable(bool, PrintGCDetails, false, \ 2099 "Print more details at garbage collect") \ 2100 \ 2101 manageable(bool, PrintGCDateStamps, false, \ 2102 "Print date stamps at garbage collect") \ 2103 \ 2104 manageable(bool, PrintGCTimeStamps, false, \ 2105 "Print timestamps at garbage collect") \ 2106 \ 2107 product(bool, PrintGCTaskTimeStamps, false, \ 2108 "Print timestamps for individual gc worker thread tasks") \ 2109 \ 2110 develop(intx, ConcGCYieldTimeout, 0, \ 2111 "If non-zero, assert that GC threads yield within this # of ms.") \ 2112 \ 2113 notproduct(bool, TraceMarkSweep, false, \ 2114 "Trace mark sweep") \ 2115 \ 2116 product(bool, PrintReferenceGC, false, \ 2117 "Print times spent handling reference objects during GC " \ 2118 " (enabled only when PrintGCDetails)") \ 2119 \ 2120 develop(bool, TraceReferenceGC, false, \ 2121 "Trace handling of soft/weak/final/phantom references") \ 2122 \ 2123 develop(bool, TraceFinalizerRegistration, false, \ 2124 "Trace registration of final references") \ 2125 \ 2126 notproduct(bool, TraceScavenge, false, \ 2127 "Trace scavenge") \ 2128 \ 2129 product_rw(bool, TraceClassLoading, false, \ 2130 "Trace all classes loaded") \ 2131 \ 2132 product(bool, TraceClassLoadingPreorder, false, \ 2133 "Trace all classes loaded in order referenced (not loaded)") \ 2134 \ 2135 product_rw(bool, TraceClassUnloading, false, \ 2136 "Trace unloading of classes") \ 2137 \ 2138 product_rw(bool, TraceLoaderConstraints, false, \ 2139 "Trace loader constraints") \ 2140 \ 2141 product(bool, TraceGen0Time, false, \ 2142 "Trace accumulated time for Gen 0 collection") \ 2143 \ 2144 product(bool, TraceGen1Time, false, \ 2145 "Trace accumulated time for Gen 1 collection") \ 2146 \ 2147 product(bool, PrintTenuringDistribution, false, \ 2148 "Print tenuring age information") \ 2149 \ 2150 product_rw(bool, PrintHeapAtGC, false, \ 2151 "Print heap layout before and after each GC") \ 2152 \ 2153 product_rw(bool, PrintHeapAtGCExtended, false, \ 2154 "Prints extended information about the layout of the heap " \ 2155 "when -XX:+PrintHeapAtGC is set") \ 2156 \ 2157 product(bool, PrintHeapAtSIGBREAK, true, \ 2158 "Print heap layout in response to SIGBREAK") \ 2159 \ 2160 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2161 "Print a class histogram before any major stop-world GC") \ 2162 \ 2163 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2164 "Print a class histogram after any major stop-world GC") \ 2165 \ 2166 manageable(bool, PrintClassHistogram, false, \ 2167 "Print a histogram of class instances") \ 2168 \ 2169 develop(bool, TraceWorkGang, false, \ 2170 "Trace activities of work gangs") \ 2171 \ 2172 product(bool, TraceParallelOldGCTasks, false, \ 2173 "Trace multithreaded GC activity") \ 2174 \ 2175 develop(bool, TraceBlockOffsetTable, false, \ 2176 "Print BlockOffsetTable maps") \ 2177 \ 2178 develop(bool, TraceCardTableModRefBS, false, \ 2179 "Print CardTableModRefBS maps") \ 2180 \ 2181 develop(bool, TraceGCTaskManager, false, \ 2182 "Trace actions of the GC task manager") \ 2183 \ 2184 develop(bool, TraceGCTaskQueue, false, \ 2185 "Trace actions of the GC task queues") \ 2186 \ 2187 develop(bool, TraceGCTaskThread, false, \ 2188 "Trace actions of the GC task threads") \ 2189 \ 2190 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2191 "Print the time taken by each parallel old gc phase." \ 2192 "PrintGCDetails must also be enabled.") \ 2193 \ 2194 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2195 "Trace parallel old gc marking phase") \ 2196 \ 2197 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2198 "Trace parallel old gc summary phase") \ 2199 \ 2200 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2201 "Trace parallel old gc compaction phase") \ 2202 \ 2203 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2204 "Trace parallel old gc dense prefix computation") \ 2205 \ 2206 develop(bool, IgnoreLibthreadGPFault, false, \ 2207 "Suppress workaround for libthread GP fault") \ 2208 \ 2209 product(bool, PrintJNIGCStalls, false, \ 2210 "Print diagnostic message when GC is stalled" \ 2211 "by JNI critical section") \ 2212 \ 2213 /* JVMTI heap profiling */ \ 2214 \ 2215 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2216 "Trace JVMTI object tagging calls") \ 2217 \ 2218 diagnostic(bool, VerifyBeforeIteration, false, \ 2219 "Verify memory system before JVMTI iteration") \ 2220 \ 2221 /* compiler interface */ \ 2222 \ 2223 develop(bool, CIPrintCompilerName, false, \ 2224 "when CIPrint is active, print the name of the active compiler") \ 2225 \ 2226 develop(bool, CIPrintCompileQueue, false, \ 2227 "display the contents of the compile queue whenever a " \ 2228 "compilation is enqueued") \ 2229 \ 2230 develop(bool, CIPrintRequests, false, \ 2231 "display every request for compilation") \ 2232 \ 2233 product(bool, CITime, false, \ 2234 "collect timing information for compilation") \ 2235 \ 2236 develop(bool, CITimeEach, false, \ 2237 "display timing information after each successful compilation") \ 2238 \ 2239 develop(bool, CICountOSR, true, \ 2240 "use a separate counter when assigning ids to osr compilations") \ 2241 \ 2242 develop(bool, CICompileNatives, true, \ 2243 "compile native methods if supported by the compiler") \ 2244 \ 2245 develop_pd(bool, CICompileOSR, \ 2246 "compile on stack replacement methods if supported by the " \ 2247 "compiler") \ 2248 \ 2249 develop(bool, CIPrintMethodCodes, false, \ 2250 "print method bytecodes of the compiled code") \ 2251 \ 2252 develop(bool, CIPrintTypeFlow, false, \ 2253 "print the results of ciTypeFlow analysis") \ 2254 \ 2255 develop(bool, CITraceTypeFlow, false, \ 2256 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2257 \ 2258 develop(intx, CICloneLoopTestLimit, 100, \ 2259 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2260 \ 2261 /* temp diagnostics */ \ 2262 \ 2263 diagnostic(bool, TraceRedundantCompiles, false, \ 2264 "Have compile broker print when a request already in the queue is"\ 2265 " requested again") \ 2266 \ 2267 diagnostic(bool, InitialCompileFast, false, \ 2268 "Initial compile at CompLevel_fast_compile") \ 2269 \ 2270 diagnostic(bool, InitialCompileReallyFast, false, \ 2271 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2272 \ 2273 diagnostic(bool, FullProfileOnReInterpret, true, \ 2274 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2275 \ 2276 /* compiler */ \ 2277 \ 2278 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2279 "Number of compiler threads to run") \ 2280 \ 2281 product(intx, CompilationPolicyChoice, 0, \ 2282 "which compilation policy (0/1)") \ 2283 \ 2284 develop(bool, UseStackBanging, true, \ 2285 "use stack banging for stack overflow checks (required for " \ 2286 "proper StackOverflow handling; disable only to measure cost " \ 2287 "of stackbanging)") \ 2288 \ 2289 develop(bool, Use24BitFPMode, true, \ 2290 "Set 24-bit FPU mode on a per-compile basis ") \ 2291 \ 2292 develop(bool, Use24BitFP, true, \ 2293 "use FP instructions that produce 24-bit precise results") \ 2294 \ 2295 develop(bool, UseStrictFP, true, \ 2296 "use strict fp if modifier strictfp is set") \ 2297 \ 2298 develop(bool, GenerateSynchronizationCode, true, \ 2299 "generate locking/unlocking code for synchronized methods and " \ 2300 "monitors") \ 2301 \ 2302 develop(bool, GenerateCompilerNullChecks, true, \ 2303 "Generate explicit null checks for loads/stores/calls") \ 2304 \ 2305 develop(bool, GenerateRangeChecks, true, \ 2306 "Generate range checks for array accesses") \ 2307 \ 2308 develop_pd(bool, ImplicitNullChecks, \ 2309 "generate code for implicit null checks") \ 2310 \ 2311 product(bool, PrintSafepointStatistics, false, \ 2312 "print statistics about safepoint synchronization") \ 2313 \ 2314 product(intx, PrintSafepointStatisticsCount, 300, \ 2315 "total number of safepoint statistics collected " \ 2316 "before printing them out") \ 2317 \ 2318 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2319 "print safepoint statistics only when safepoint takes" \ 2320 " more than PrintSafepointSatisticsTimeout in millis") \ 2321 \ 2322 product(bool, TraceSafepointCleanupTime, false, \ 2323 "print the break down of clean up tasks performed during" \ 2324 " safepoint") \ 2325 \ 2326 develop(bool, InlineAccessors, true, \ 2327 "inline accessor methods (get/set)") \ 2328 \ 2329 product(bool, Inline, true, \ 2330 "enable inlining") \ 2331 \ 2332 product(bool, ClipInlining, true, \ 2333 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2334 \ 2335 develop(bool, UseCHA, true, \ 2336 "enable CHA") \ 2337 \ 2338 product(bool, UseTypeProfile, true, \ 2339 "Check interpreter profile for historically monomorphic calls") \ 2340 \ 2341 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2342 "% of major receiver type to all profiled receivers") \ 2343 \ 2344 notproduct(bool, TimeCompiler, false, \ 2345 "time the compiler") \ 2346 \ 2347 notproduct(bool, TimeCompiler2, false, \ 2348 "detailed time the compiler (requires +TimeCompiler)") \ 2349 \ 2350 diagnostic(bool, PrintInlining, false, \ 2351 "prints inlining optimizations") \ 2352 \ 2353 diagnostic(bool, PrintIntrinsics, false, \ 2354 "prints attempted and successful inlining of intrinsics") \ 2355 \ 2356 product(bool, UseCountLeadingZerosInstruction, false, \ 2357 "Use count leading zeros instruction") \ 2358 \ 2359 product(bool, UsePopCountInstruction, false, \ 2360 "Use population count instruction") \ 2361 \ 2362 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2363 "do not expand intrinsics whose (internal) names appear here") \ 2364 \ 2365 develop(bool, StressReflectiveCode, false, \ 2366 "Use inexact types at allocations, etc., to test reflection") \ 2367 \ 2368 develop(bool, EagerInitialization, false, \ 2369 "Eagerly initialize classes if possible") \ 2370 \ 2371 develop(bool, TraceMethodReplacement, false, \ 2372 "Print when methods are replaced do to recompilation") \ 2373 \ 2374 develop(bool, PrintMethodFlushing, false, \ 2375 "print the nmethods being flushed") \ 2376 \ 2377 notproduct(bool, LogMultipleMutexLocking, false, \ 2378 "log locking and unlocking of mutexes (only if multiple locks " \ 2379 "are held)") \ 2380 \ 2381 develop(bool, UseRelocIndex, false, \ 2382 "use an index to speed random access to relocations") \ 2383 \ 2384 develop(bool, StressCodeBuffers, false, \ 2385 "Exercise code buffer expansion and other rare state changes") \ 2386 \ 2387 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2388 "Generate extra debugging info for non-safepoints in nmethods") \ 2389 \ 2390 diagnostic(bool, DebugInlinedCalls, true, \ 2391 "If false, restricts profiled locations to the root method only") \ 2392 \ 2393 product(bool, PrintVMOptions, trueInDebug, \ 2394 "Print flags that appeared on the command line") \ 2395 \ 2396 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2397 "Ignore unrecognized VM options") \ 2398 \ 2399 product(bool, PrintCommandLineFlags, false, \ 2400 "Print flags specified on command line or set by ergonomics") \ 2401 \ 2402 product(bool, PrintFlagsInitial, false, \ 2403 "Print all VM flags before argument processing and exit VM") \ 2404 \ 2405 product(bool, PrintFlagsFinal, false, \ 2406 "Print all VM flags after argument and ergonomic processing") \ 2407 \ 2408 notproduct(bool, PrintFlagsWithComments, false, \ 2409 "Print all VM flags with default values and descriptions and exit")\ 2410 \ 2411 diagnostic(bool, SerializeVMOutput, true, \ 2412 "Use a mutex to serialize output to tty and hotspot.log") \ 2413 \ 2414 diagnostic(bool, DisplayVMOutput, true, \ 2415 "Display all VM output on the tty, independently of LogVMOutput") \ 2416 \ 2417 diagnostic(bool, LogVMOutput, trueInDebug, \ 2418 "Save VM output to hotspot.log, or to LogFile") \ 2419 \ 2420 diagnostic(ccstr, LogFile, NULL, \ 2421 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2422 \ 2423 product(ccstr, ErrorFile, NULL, \ 2424 "If an error occurs, save the error data to this file " \ 2425 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2426 \ 2427 product(bool, DisplayVMOutputToStderr, false, \ 2428 "If DisplayVMOutput is true, display all VM output to stderr") \ 2429 \ 2430 product(bool, DisplayVMOutputToStdout, false, \ 2431 "If DisplayVMOutput is true, display all VM output to stdout") \ 2432 \ 2433 product(bool, UseHeavyMonitors, false, \ 2434 "use heavyweight instead of lightweight Java monitors") \ 2435 \ 2436 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2437 "print histogram of the symbol table") \ 2438 \ 2439 notproduct(bool, ExitVMOnVerifyError, false, \ 2440 "standard exit from VM if bytecode verify error " \ 2441 "(only in debug mode)") \ 2442 \ 2443 notproduct(ccstr, AbortVMOnException, NULL, \ 2444 "Call fatal if this exception is thrown. Example: " \ 2445 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2446 \ 2447 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2448 "Call fatal if the exception pointed by AbortVMOnException " \ 2449 "has this message.") \ 2450 \ 2451 develop(bool, DebugVtables, false, \ 2452 "add debugging code to vtable dispatch") \ 2453 \ 2454 develop(bool, PrintVtables, false, \ 2455 "print vtables when printing klass") \ 2456 \ 2457 notproduct(bool, PrintVtableStats, false, \ 2458 "print vtables stats at end of run") \ 2459 \ 2460 develop(bool, TraceCreateZombies, false, \ 2461 "trace creation of zombie nmethods") \ 2462 \ 2463 notproduct(bool, IgnoreLockingAssertions, false, \ 2464 "disable locking assertions (for speed)") \ 2465 \ 2466 notproduct(bool, VerifyLoopOptimizations, false, \ 2467 "verify major loop optimizations") \ 2468 \ 2469 product(bool, RangeCheckElimination, true, \ 2470 "Split loop iterations to eliminate range checks") \ 2471 \ 2472 develop_pd(bool, UncommonNullCast, \ 2473 "track occurrences of null in casts; adjust compiler tactics") \ 2474 \ 2475 develop(bool, TypeProfileCasts, true, \ 2476 "treat casts like calls for purposes of type profiling") \ 2477 \ 2478 develop(bool, MonomorphicArrayCheck, true, \ 2479 "Uncommon-trap array store checks that require full type check") \ 2480 \ 2481 diagnostic(bool, ProfileDynamicTypes, true, \ 2482 "do extra type profiling and use it more aggressively") \ 2483 \ 2484 develop(bool, DelayCompilationDuringStartup, true, \ 2485 "Delay invoking the compiler until main application class is " \ 2486 "loaded") \ 2487 \ 2488 develop(bool, CompileTheWorld, false, \ 2489 "Compile all methods in all classes in bootstrap class path " \ 2490 "(stress test)") \ 2491 \ 2492 develop(bool, CompileTheWorldPreloadClasses, true, \ 2493 "Preload all classes used by a class before start loading") \ 2494 \ 2495 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2496 "Compile all methods although class initializer failed") \ 2497 \ 2498 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2499 "Force a safepoint every n compiles so sweeper can keep up") \ 2500 \ 2501 develop(bool, TraceIterativeGVN, false, \ 2502 "Print progress during Iterative Global Value Numbering") \ 2503 \ 2504 develop(bool, FillDelaySlots, true, \ 2505 "Fill delay slots (on SPARC only)") \ 2506 \ 2507 develop(bool, VerifyIterativeGVN, false, \ 2508 "Verify Def-Use modifications during sparse Iterative Global " \ 2509 "Value Numbering") \ 2510 \ 2511 notproduct(bool, TracePhaseCCP, false, \ 2512 "Print progress during Conditional Constant Propagation") \ 2513 \ 2514 develop(bool, TimeLivenessAnalysis, false, \ 2515 "Time computation of bytecode liveness analysis") \ 2516 \ 2517 develop(bool, TraceLivenessGen, false, \ 2518 "Trace the generation of liveness analysis information") \ 2519 \ 2520 notproduct(bool, TraceLivenessQuery, false, \ 2521 "Trace queries of liveness analysis information") \ 2522 \ 2523 notproduct(bool, CollectIndexSetStatistics, false, \ 2524 "Collect information about IndexSets") \ 2525 \ 2526 develop(bool, PrintDominators, false, \ 2527 "Print out dominator trees for GVN") \ 2528 \ 2529 develop(bool, UseLoopSafepoints, true, \ 2530 "Generate Safepoint nodes in every loop") \ 2531 \ 2532 notproduct(bool, TraceCISCSpill, false, \ 2533 "Trace allocators use of cisc spillable instructions") \ 2534 \ 2535 notproduct(bool, TraceSpilling, false, \ 2536 "Trace spilling") \ 2537 \ 2538 product(bool, SplitIfBlocks, true, \ 2539 "Clone compares and control flow through merge points to fold " \ 2540 "some branches") \ 2541 \ 2542 develop(intx, FastAllocateSizeLimit, 128*K, \ 2543 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2544 "Inline allocations larger than this in doublewords must go slow")\ 2545 \ 2546 product(bool, AggressiveOpts, false, \ 2547 "Enable aggressive optimizations - see arguments.cpp") \ 2548 \ 2549 product(bool, UseStringCache, false, \ 2550 "Enable String cache capabilities on String.java") \ 2551 \ 2552 /* statistics */ \ 2553 develop(bool, CountCompiledCalls, false, \ 2554 "counts method invocations") \ 2555 \ 2556 notproduct(bool, CountRuntimeCalls, false, \ 2557 "counts VM runtime calls") \ 2558 \ 2559 develop(bool, CountJNICalls, false, \ 2560 "counts jni method invocations") \ 2561 \ 2562 notproduct(bool, CountJVMCalls, false, \ 2563 "counts jvm method invocations") \ 2564 \ 2565 notproduct(bool, CountRemovableExceptions, false, \ 2566 "count exceptions that could be replaced by branches due to " \ 2567 "inlining") \ 2568 \ 2569 notproduct(bool, ICMissHistogram, false, \ 2570 "produce histogram of IC misses") \ 2571 \ 2572 notproduct(bool, PrintClassStatistics, false, \ 2573 "prints class statistics at end of run") \ 2574 \ 2575 notproduct(bool, PrintMethodStatistics, false, \ 2576 "prints method statistics at end of run") \ 2577 \ 2578 /* interpreter */ \ 2579 develop(bool, ClearInterpreterLocals, false, \ 2580 "Always clear local variables of interpreter activations upon " \ 2581 "entry") \ 2582 \ 2583 product_pd(bool, RewriteBytecodes, \ 2584 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2585 \ 2586 product_pd(bool, RewriteFrequentPairs, \ 2587 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2588 \ 2589 diagnostic(bool, PrintInterpreter, false, \ 2590 "Prints the generated interpreter code") \ 2591 \ 2592 product(bool, UseInterpreter, true, \ 2593 "Use interpreter for non-compiled methods") \ 2594 \ 2595 develop(bool, UseFastSignatureHandlers, true, \ 2596 "Use fast signature handlers for native calls") \ 2597 \ 2598 develop(bool, UseV8InstrsOnly, false, \ 2599 "Use SPARC-V8 Compliant instruction subset") \ 2600 \ 2601 product(bool, UseNiagaraInstrs, false, \ 2602 "Use Niagara-efficient instruction subset") \ 2603 \ 2604 develop(bool, UseCASForSwap, false, \ 2605 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2606 \ 2607 product(bool, UseLoopCounter, true, \ 2608 "Increment invocation counter on backward branch") \ 2609 \ 2610 product(bool, UseFastEmptyMethods, true, \ 2611 "Use fast method entry code for empty methods") \ 2612 \ 2613 product(bool, UseFastAccessorMethods, true, \ 2614 "Use fast method entry code for accessor methods") \ 2615 \ 2616 product_pd(bool, UseOnStackReplacement, \ 2617 "Use on stack replacement, calls runtime if invoc. counter " \ 2618 "overflows in loop") \ 2619 \ 2620 notproduct(bool, TraceOnStackReplacement, false, \ 2621 "Trace on stack replacement") \ 2622 \ 2623 develop(bool, PoisonOSREntry, true, \ 2624 "Detect abnormal calls to OSR code") \ 2625 \ 2626 product_pd(bool, PreferInterpreterNativeStubs, \ 2627 "Use always interpreter stubs for native methods invoked via " \ 2628 "interpreter") \ 2629 \ 2630 develop(bool, CountBytecodes, false, \ 2631 "Count number of bytecodes executed") \ 2632 \ 2633 develop(bool, PrintBytecodeHistogram, false, \ 2634 "Print histogram of the executed bytecodes") \ 2635 \ 2636 develop(bool, PrintBytecodePairHistogram, false, \ 2637 "Print histogram of the executed bytecode pairs") \ 2638 \ 2639 diagnostic(bool, PrintSignatureHandlers, false, \ 2640 "Print code generated for native method signature handlers") \ 2641 \ 2642 develop(bool, VerifyOops, false, \ 2643 "Do plausibility checks for oops") \ 2644 \ 2645 develop(bool, CheckUnhandledOops, false, \ 2646 "Check for unhandled oops in VM code") \ 2647 \ 2648 develop(bool, VerifyJNIFields, trueInDebug, \ 2649 "Verify jfieldIDs for instance fields") \ 2650 \ 2651 notproduct(bool, VerifyJNIEnvThread, false, \ 2652 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2653 "from JNI") \ 2654 \ 2655 develop(bool, VerifyFPU, false, \ 2656 "Verify FPU state (check for NaN's, etc.)") \ 2657 \ 2658 develop(bool, VerifyThread, false, \ 2659 "Watch the thread register for corruption (SPARC only)") \ 2660 \ 2661 develop(bool, VerifyActivationFrameSize, false, \ 2662 "Verify that activation frame didn't become smaller than its " \ 2663 "minimal size") \ 2664 \ 2665 develop(bool, TraceFrequencyInlining, false, \ 2666 "Trace frequency based inlining") \ 2667 \ 2668 notproduct(bool, TraceTypeProfile, false, \ 2669 "Trace type profile") \ 2670 \ 2671 develop_pd(bool, InlineIntrinsics, \ 2672 "Inline intrinsics that can be statically resolved") \ 2673 \ 2674 product_pd(bool, ProfileInterpreter, \ 2675 "Profile at the bytecode level during interpretation") \ 2676 \ 2677 develop_pd(bool, ProfileTraps, \ 2678 "Profile deoptimization traps at the bytecode level") \ 2679 \ 2680 product(intx, ProfileMaturityPercentage, 20, \ 2681 "number of method invocations/branches (expressed as % of " \ 2682 "CompileThreshold) before using the method's profile") \ 2683 \ 2684 develop(bool, PrintMethodData, false, \ 2685 "Print the results of +ProfileInterpreter at end of run") \ 2686 \ 2687 develop(bool, VerifyDataPointer, trueInDebug, \ 2688 "Verify the method data pointer during interpreter profiling") \ 2689 \ 2690 develop(bool, VerifyCompiledCode, false, \ 2691 "Include miscellaneous runtime verifications in nmethod code; " \ 2692 "default off because it disturbs nmethod size heuristics") \ 2693 \ 2694 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2695 "Manually make GC thread crash then dump java stack trace; " \ 2696 "Test only") \ 2697 \ 2698 /* compilation */ \ 2699 product(bool, UseCompiler, true, \ 2700 "use compilation") \ 2701 \ 2702 develop(bool, TraceCompilationPolicy, false, \ 2703 "Trace compilation policy") \ 2704 \ 2705 develop(bool, TimeCompilationPolicy, false, \ 2706 "Time the compilation policy") \ 2707 \ 2708 product(bool, UseCounterDecay, true, \ 2709 "adjust recompilation counters") \ 2710 \ 2711 develop(intx, CounterHalfLifeTime, 30, \ 2712 "half-life time of invocation counters (in secs)") \ 2713 \ 2714 develop(intx, CounterDecayMinIntervalLength, 500, \ 2715 "Min. ms. between invocation of CounterDecay") \ 2716 \ 2717 product(bool, AlwaysCompileLoopMethods, false, \ 2718 "when using recompilation, never interpret methods " \ 2719 "containing loops") \ 2720 \ 2721 product(bool, DontCompileHugeMethods, true, \ 2722 "don't compile methods > HugeMethodLimit") \ 2723 \ 2724 /* Bytecode escape analysis estimation. */ \ 2725 product(bool, EstimateArgEscape, true, \ 2726 "Analyze bytecodes to estimate escape state of arguments") \ 2727 \ 2728 product(intx, BCEATraceLevel, 0, \ 2729 "How much tracing to do of bytecode escape analysis estimates") \ 2730 \ 2731 product(intx, MaxBCEAEstimateLevel, 5, \ 2732 "Maximum number of nested calls that are analyzed by BC EA.") \ 2733 \ 2734 product(intx, MaxBCEAEstimateSize, 150, \ 2735 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2736 \ 2737 product(intx, AllocatePrefetchStyle, 1, \ 2738 "0 = no prefetch, " \ 2739 "1 = prefetch instructions for each allocation, " \ 2740 "2 = use TLAB watermark to gate allocation prefetch, " \ 2741 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2742 \ 2743 product(intx, AllocatePrefetchDistance, -1, \ 2744 "Distance to prefetch ahead of allocation pointer") \ 2745 \ 2746 product(intx, AllocatePrefetchLines, 1, \ 2747 "Number of lines to prefetch ahead of allocation pointer") \ 2748 \ 2749 product(intx, AllocatePrefetchStepSize, 16, \ 2750 "Step size in bytes of sequential prefetch instructions") \ 2751 \ 2752 product(intx, AllocatePrefetchInstr, 0, \ 2753 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2754 \ 2755 product(intx, ReadPrefetchInstr, 0, \ 2756 "Prefetch instruction to prefetch ahead") \ 2757 \ 2758 /* deoptimization */ \ 2759 develop(bool, TraceDeoptimization, false, \ 2760 "Trace deoptimization") \ 2761 \ 2762 develop(bool, DebugDeoptimization, false, \ 2763 "Tracing various information while debugging deoptimization") \ 2764 \ 2765 product(intx, SelfDestructTimer, 0, \ 2766 "Will cause VM to terminate after a given time (in minutes) " \ 2767 "(0 means off)") \ 2768 \ 2769 product(intx, MaxJavaStackTraceDepth, 1024, \ 2770 "Max. no. of lines in the stack trace for Java exceptions " \ 2771 "(0 means all)") \ 2772 \ 2773 develop(intx, GuaranteedSafepointInterval, 1000, \ 2774 "Guarantee a safepoint (at least) every so many milliseconds " \ 2775 "(0 means none)") \ 2776 \ 2777 product(intx, SafepointTimeoutDelay, 10000, \ 2778 "Delay in milliseconds for option SafepointTimeout") \ 2779 \ 2780 product(intx, NmethodSweepFraction, 4, \ 2781 "Number of invocations of sweeper to cover all nmethods") \ 2782 \ 2783 product(intx, NmethodSweepCheckInterval, 5, \ 2784 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2785 \ 2786 notproduct(intx, MemProfilingInterval, 500, \ 2787 "Time between each invocation of the MemProfiler") \ 2788 \ 2789 develop(intx, MallocCatchPtr, -1, \ 2790 "Hit breakpoint when mallocing/freeing this pointer") \ 2791 \ 2792 notproduct(intx, AssertRepeat, 1, \ 2793 "number of times to evaluate expression in assert " \ 2794 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2795 \ 2796 notproduct(ccstrlist, SuppressErrorAt, "", \ 2797 "List of assertions (file:line) to muzzle") \ 2798 \ 2799 notproduct(uintx, HandleAllocationLimit, 1024, \ 2800 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2801 "is used") \ 2802 \ 2803 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2804 "Threshold for total handle allocation when " \ 2805 "+TraceHandleAllocation is used") \ 2806 \ 2807 develop(intx, StackPrintLimit, 100, \ 2808 "number of stack frames to print in VM-level stack dump") \ 2809 \ 2810 notproduct(intx, MaxElementPrintSize, 256, \ 2811 "maximum number of elements to print") \ 2812 \ 2813 notproduct(intx, MaxSubklassPrintSize, 4, \ 2814 "maximum number of subklasses to print when printing klass") \ 2815 \ 2816 product(intx, MaxInlineLevel, 9, \ 2817 "maximum number of nested calls that are inlined") \ 2818 \ 2819 product(intx, MaxRecursiveInlineLevel, 1, \ 2820 "maximum number of nested recursive calls that are inlined") \ 2821 \ 2822 product_pd(intx, InlineSmallCode, \ 2823 "Only inline already compiled methods if their code size is " \ 2824 "less than this") \ 2825 \ 2826 product(intx, MaxInlineSize, 35, \ 2827 "maximum bytecode size of a method to be inlined") \ 2828 \ 2829 product_pd(intx, FreqInlineSize, \ 2830 "maximum bytecode size of a frequent method to be inlined") \ 2831 \ 2832 product(intx, MaxTrivialSize, 6, \ 2833 "maximum bytecode size of a trivial method to be inlined") \ 2834 \ 2835 product(intx, MinInliningThreshold, 250, \ 2836 "min. invocation count a method needs to have to be inlined") \ 2837 \ 2838 develop(intx, AlignEntryCode, 4, \ 2839 "aligns entry code to specified value (in bytes)") \ 2840 \ 2841 develop(intx, MethodHistogramCutoff, 100, \ 2842 "cutoff value for method invoc. histogram (+CountCalls)") \ 2843 \ 2844 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2845 "# of interpreted methods to show in profile") \ 2846 \ 2847 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2848 "# of compiled methods to show in profile") \ 2849 \ 2850 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2851 "# of stub methods to show in profile") \ 2852 \ 2853 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2854 "# of runtime stub nodes to show in profile") \ 2855 \ 2856 product(intx, ProfileIntervalsTicks, 100, \ 2857 "# of ticks between printing of interval profile " \ 2858 "(+ProfileIntervals)") \ 2859 \ 2860 notproduct(intx, ScavengeALotInterval, 1, \ 2861 "Interval between which scavenge will occur with +ScavengeALot") \ 2862 \ 2863 notproduct(intx, FullGCALotInterval, 1, \ 2864 "Interval between which full gc will occur with +FullGCALot") \ 2865 \ 2866 notproduct(intx, FullGCALotStart, 0, \ 2867 "For which invocation to start FullGCAlot") \ 2868 \ 2869 notproduct(intx, FullGCALotDummies, 32*K, \ 2870 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2871 "to move") \ 2872 \ 2873 develop(intx, DontYieldALotInterval, 10, \ 2874 "Interval between which yields will be dropped (milliseconds)") \ 2875 \ 2876 develop(intx, MinSleepInterval, 1, \ 2877 "Minimum sleep() interval (milliseconds) when " \ 2878 "ConvertSleepToYield is off (used for SOLARIS)") \ 2879 \ 2880 product(intx, EventLogLength, 2000, \ 2881 "maximum nof events in event log") \ 2882 \ 2883 develop(intx, ProfilerPCTickThreshold, 15, \ 2884 "Number of ticks in a PC buckets to be a hotspot") \ 2885 \ 2886 notproduct(intx, DeoptimizeALotInterval, 5, \ 2887 "Number of exits until DeoptimizeALot kicks in") \ 2888 \ 2889 notproduct(intx, ZombieALotInterval, 5, \ 2890 "Number of exits until ZombieALot kicks in") \ 2891 \ 2892 develop(bool, StressNonEntrant, false, \ 2893 "Mark nmethods non-entrant at registration") \ 2894 \ 2895 diagnostic(intx, MallocVerifyInterval, 0, \ 2896 "if non-zero, verify C heap after every N calls to " \ 2897 "malloc/realloc/free") \ 2898 \ 2899 diagnostic(intx, MallocVerifyStart, 0, \ 2900 "if non-zero, start verifying C heap after Nth call to " \ 2901 "malloc/realloc/free") \ 2902 \ 2903 product(intx, TypeProfileWidth, 2, \ 2904 "number of receiver types to record in call/cast profile") \ 2905 \ 2906 develop(intx, BciProfileWidth, 2, \ 2907 "number of return bci's to record in ret profile") \ 2908 \ 2909 product(intx, PerMethodRecompilationCutoff, 400, \ 2910 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2911 \ 2912 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2913 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2914 \ 2915 product(intx, PerMethodTrapLimit, 100, \ 2916 "Limit on traps (of one kind) in a method (includes inlines)") \ 2917 \ 2918 product(intx, PerBytecodeTrapLimit, 4, \ 2919 "Limit on traps (of one kind) at a particular BCI") \ 2920 \ 2921 develop(intx, FreqCountInvocations, 1, \ 2922 "Scaling factor for branch frequencies (deprecated)") \ 2923 \ 2924 develop(intx, InlineFrequencyRatio, 20, \ 2925 "Ratio of call site execution to caller method invocation") \ 2926 \ 2927 develop_pd(intx, InlineFrequencyCount, \ 2928 "Count of call site execution necessary to trigger frequent " \ 2929 "inlining") \ 2930 \ 2931 develop(intx, InlineThrowCount, 50, \ 2932 "Force inlining of interpreted methods that throw this often") \ 2933 \ 2934 develop(intx, InlineThrowMaxSize, 200, \ 2935 "Force inlining of throwing methods smaller than this") \ 2936 \ 2937 product(intx, AliasLevel, 3, \ 2938 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2939 "2 for class split, 3 for unique instances") \ 2940 \ 2941 develop(bool, VerifyAliases, false, \ 2942 "perform extra checks on the results of alias analysis") \ 2943 \ 2944 develop(intx, ProfilerNodeSize, 1024, \ 2945 "Size in K to allocate for the Profile Nodes of each thread") \ 2946 \ 2947 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2948 "Number of times to spin wait on a v8 atomic operation lock") \ 2949 \ 2950 product(intx, ReadSpinIterations, 100, \ 2951 "Number of read attempts before a yield (spin inner loop)") \ 2952 \ 2953 product_pd(intx, PreInflateSpin, \ 2954 "Number of times to spin wait before inflation") \ 2955 \ 2956 product(intx, PreBlockSpin, 10, \ 2957 "Number of times to spin in an inflated lock before going to " \ 2958 "an OS lock") \ 2959 \ 2960 /* gc parameters */ \ 2961 product(uintx, InitialHeapSize, 0, \ 2962 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2963 \ 2964 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2965 "Maximum heap size (in bytes)") \ 2966 \ 2967 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2968 "Initial tenured generation size (in bytes)") \ 2969 \ 2970 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2971 "Initial new generation size (in bytes)") \ 2972 \ 2973 product(uintx, MaxNewSize, max_uintx, \ 2974 "Maximum new generation size (in bytes), max_uintx means set " \ 2975 "ergonomically") \ 2976 \ 2977 product(uintx, PretenureSizeThreshold, 0, \ 2978 "Maximum size in bytes of objects allocated in DefNew " \ 2979 "generation; zero means no maximum") \ 2980 \ 2981 product(uintx, TLABSize, 0, \ 2982 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2983 \ 2984 product(uintx, MinTLABSize, 2*K, \ 2985 "Minimum allowed TLAB size (in bytes)") \ 2986 \ 2987 product(uintx, TLABAllocationWeight, 35, \ 2988 "Allocation averaging weight") \ 2989 \ 2990 product(uintx, TLABWasteTargetPercent, 1, \ 2991 "Percentage of Eden that can be wasted") \ 2992 \ 2993 product(uintx, TLABRefillWasteFraction, 64, \ 2994 "Max TLAB waste at a refill (internal fragmentation)") \ 2995 \ 2996 product(uintx, TLABWasteIncrement, 4, \ 2997 "Increment allowed waste at slow allocation") \ 2998 \ 2999 product(intx, SurvivorRatio, 8, \ 3000 "Ratio of eden/survivor space size") \ 3001 \ 3002 product(intx, NewRatio, 2, \ 3003 "Ratio of new/old generation sizes") \ 3004 \ 3005 product_pd(uintx, NewSizeThreadIncrease, \ 3006 "Additional size added to desired new generation size per " \ 3007 "non-daemon thread (in bytes)") \ 3008 \ 3009 product_pd(uintx, PermSize, \ 3010 "Initial size of permanent generation (in bytes)") \ 3011 \ 3012 product_pd(uintx, MaxPermSize, \ 3013 "Maximum size of permanent generation (in bytes)") \ 3014 \ 3015 product(uintx, MinHeapFreeRatio, 40, \ 3016 "Min percentage of heap free after GC to avoid expansion") \ 3017 \ 3018 product(uintx, MaxHeapFreeRatio, 70, \ 3019 "Max percentage of heap free after GC to avoid shrinking") \ 3020 \ 3021 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3022 "Number of milliseconds per MB of free space in the heap") \ 3023 \ 3024 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3025 "Min change in heap space due to GC (in bytes)") \ 3026 \ 3027 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3028 "Min expansion of permanent heap (in bytes)") \ 3029 \ 3030 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3031 "Max expansion of permanent heap without full GC (in bytes)") \ 3032 \ 3033 product(intx, QueuedAllocationWarningCount, 0, \ 3034 "Number of times an allocation that queues behind a GC " \ 3035 "will retry before printing a warning") \ 3036 \ 3037 diagnostic(uintx, VerifyGCStartAt, 0, \ 3038 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3039 \ 3040 diagnostic(intx, VerifyGCLevel, 0, \ 3041 "Generation level at which to start +VerifyBefore/AfterGC") \ 3042 \ 3043 develop(uintx, ExitAfterGCNum, 0, \ 3044 "If non-zero, exit after this GC.") \ 3045 \ 3046 product(intx, MaxTenuringThreshold, 15, \ 3047 "Maximum value for tenuring threshold") \ 3048 \ 3049 product(intx, InitialTenuringThreshold, 7, \ 3050 "Initial value for tenuring threshold") \ 3051 \ 3052 product(intx, TargetSurvivorRatio, 50, \ 3053 "Desired percentage of survivor space used after scavenge") \ 3054 \ 3055 product(uintx, MarkSweepDeadRatio, 5, \ 3056 "Percentage (0-100) of the old gen allowed as dead wood." \ 3057 "Serial mark sweep treats this as both the min and max value." \ 3058 "CMS uses this value only if it falls back to mark sweep." \ 3059 "Par compact uses a variable scale based on the density of the" \ 3060 "generation and treats this as the max value when the heap is" \ 3061 "either completely full or completely empty. Par compact also" \ 3062 "has a smaller default value; see arguments.cpp.") \ 3063 \ 3064 product(uintx, PermMarkSweepDeadRatio, 20, \ 3065 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3066 "See MarkSweepDeadRatio for collector-specific comments.") \ 3067 \ 3068 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3069 "How often should we fully compact the heap (ignoring the dead " \ 3070 "space parameters)") \ 3071 \ 3072 product(intx, PrintCMSStatistics, 0, \ 3073 "Statistics for CMS") \ 3074 \ 3075 product(bool, PrintCMSInitiationStatistics, false, \ 3076 "Statistics for initiating a CMS collection") \ 3077 \ 3078 product(intx, PrintFLSStatistics, 0, \ 3079 "Statistics for CMS' FreeListSpace") \ 3080 \ 3081 product(intx, PrintFLSCensus, 0, \ 3082 "Census for CMS' FreeListSpace") \ 3083 \ 3084 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3085 "Delay in ms between expansion and allocation") \ 3086 \ 3087 product(intx, DeferThrSuspendLoopCount, 4000, \ 3088 "(Unstable) Number of times to iterate in safepoint loop " \ 3089 " before blocking VM threads ") \ 3090 \ 3091 product(intx, DeferPollingPageLoopCount, -1, \ 3092 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3093 "before changing safepoint polling page to RO ") \ 3094 \ 3095 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3096 \ 3097 product(bool, PSChunkLargeArrays, true, \ 3098 "true: process large arrays in chunks") \ 3099 \ 3100 product(uintx, GCDrainStackTargetSize, 64, \ 3101 "how many entries we'll try to leave on the stack during " \ 3102 "parallel GC") \ 3103 \ 3104 /* stack parameters */ \ 3105 product_pd(intx, StackYellowPages, \ 3106 "Number of yellow zone (recoverable overflows) pages") \ 3107 \ 3108 product_pd(intx, StackRedPages, \ 3109 "Number of red zone (unrecoverable overflows) pages") \ 3110 \ 3111 product_pd(intx, StackShadowPages, \ 3112 "Number of shadow zone (for overflow checking) pages" \ 3113 " this should exceed the depth of the VM and native call stack") \ 3114 \ 3115 product_pd(intx, ThreadStackSize, \ 3116 "Thread Stack Size (in Kbytes)") \ 3117 \ 3118 product_pd(intx, VMThreadStackSize, \ 3119 "Non-Java Thread Stack Size (in Kbytes)") \ 3120 \ 3121 product_pd(intx, CompilerThreadStackSize, \ 3122 "Compiler Thread Stack Size (in Kbytes)") \ 3123 \ 3124 develop_pd(uintx, JVMInvokeMethodSlack, \ 3125 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3126 \ 3127 product(uintx, ThreadSafetyMargin, 50*M, \ 3128 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3129 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3130 "disable this feature") \ 3131 \ 3132 /* code cache parameters */ \ 3133 develop(uintx, CodeCacheSegmentSize, 64, \ 3134 "Code cache segment size (in bytes) - smallest unit of " \ 3135 "allocation") \ 3136 \ 3137 develop_pd(intx, CodeEntryAlignment, \ 3138 "Code entry alignment for generated code (in bytes)") \ 3139 \ 3140 product_pd(intx, OptoLoopAlignment, \ 3141 "Align inner loops to zero relative to this modulus") \ 3142 \ 3143 product_pd(uintx, InitialCodeCacheSize, \ 3144 "Initial code cache size (in bytes)") \ 3145 \ 3146 product_pd(uintx, ReservedCodeCacheSize, \ 3147 "Reserved code cache size (in bytes) - maximum code cache size") \ 3148 \ 3149 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3150 "When less than X space left, we stop compiling.") \ 3151 \ 3152 product_pd(uintx, CodeCacheExpansionSize, \ 3153 "Code cache expansion size (in bytes)") \ 3154 \ 3155 develop_pd(uintx, CodeCacheMinBlockLength, \ 3156 "Minimum number of segments in a code cache block.") \ 3157 \ 3158 notproduct(bool, ExitOnFullCodeCache, false, \ 3159 "Exit the VM if we fill the code cache.") \ 3160 \ 3161 product(bool, UseCodeCacheFlushing, false, \ 3162 "Attempt to clean the code cache before shutting off compiler") \ 3163 \ 3164 product(intx, MinCodeCacheFlushingInterval, 30, \ 3165 "Min number of seconds between code cache cleaning sessions") \ 3166 \ 3167 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3168 "When less than X space left, start code cache cleaning") \ 3169 \ 3170 /* interpreter debugging */ \ 3171 develop(intx, BinarySwitchThreshold, 5, \ 3172 "Minimal number of lookupswitch entries for rewriting to binary " \ 3173 "switch") \ 3174 \ 3175 develop(intx, StopInterpreterAt, 0, \ 3176 "Stops interpreter execution at specified bytecode number") \ 3177 \ 3178 develop(intx, TraceBytecodesAt, 0, \ 3179 "Traces bytecodes starting with specified bytecode number") \ 3180 \ 3181 /* compiler interface */ \ 3182 develop(intx, CIStart, 0, \ 3183 "the id of the first compilation to permit") \ 3184 \ 3185 develop(intx, CIStop, -1, \ 3186 "the id of the last compilation to permit") \ 3187 \ 3188 develop(intx, CIStartOSR, 0, \ 3189 "the id of the first osr compilation to permit " \ 3190 "(CICountOSR must be on)") \ 3191 \ 3192 develop(intx, CIStopOSR, -1, \ 3193 "the id of the last osr compilation to permit " \ 3194 "(CICountOSR must be on)") \ 3195 \ 3196 develop(intx, CIBreakAtOSR, -1, \ 3197 "id of osr compilation to break at") \ 3198 \ 3199 develop(intx, CIBreakAt, -1, \ 3200 "id of compilation to break at") \ 3201 \ 3202 product(ccstrlist, CompileOnly, "", \ 3203 "List of methods (pkg/class.name) to restrict compilation to") \ 3204 \ 3205 product(ccstr, CompileCommandFile, NULL, \ 3206 "Read compiler commands from this file [.hotspot_compiler]") \ 3207 \ 3208 product(ccstrlist, CompileCommand, "", \ 3209 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3210 \ 3211 product(bool, CICompilerCountPerCPU, false, \ 3212 "1 compiler thread for log(N CPUs)") \ 3213 \ 3214 develop(intx, CIFireOOMAt, -1, \ 3215 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3216 "(non-negative value throws OOM after this many CI accesses " \ 3217 "in each compile)") \ 3218 \ 3219 develop(intx, CIFireOOMAtDelay, -1, \ 3220 "Wait for this many CI accesses to occur in all compiles before " \ 3221 "beginning to throw OutOfMemoryErrors in each compile") \ 3222 \ 3223 notproduct(bool, CIObjectFactoryVerify, false, \ 3224 "enable potentially expensive verification in ciObjectFactory") \ 3225 \ 3226 /* Priorities */ \ 3227 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3228 \ 3229 product(intx, ThreadPriorityPolicy, 0, \ 3230 "0 : Normal. "\ 3231 " VM chooses priorities that are appropriate for normal "\ 3232 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3233 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3234 " map to lower native priority values. On Windows applications"\ 3235 " are allowed to use higher native priorities. However, with "\ 3236 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3237 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3238 " interfere with system threads. On Linux thread priorities "\ 3239 " are ignored because the OS does not support static priority "\ 3240 " in SCHED_OTHER scheduling class which is the only choice for"\ 3241 " non-root, non-realtime applications. "\ 3242 "1 : Aggressive. "\ 3243 " Java thread priorities map over to the entire range of "\ 3244 " native thread priorities. Higher Java thread priorities map "\ 3245 " to higher native thread priorities. This policy should be "\ 3246 " used with care, as sometimes it can cause performance "\ 3247 " degradation in the application and/or the entire system. On "\ 3248 " Linux this policy requires root privilege.") \ 3249 \ 3250 product(bool, ThreadPriorityVerbose, false, \ 3251 "print priority changes") \ 3252 \ 3253 product(intx, DefaultThreadPriority, -1, \ 3254 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3255 \ 3256 product(intx, CompilerThreadPriority, -1, \ 3257 "what priority should compiler threads run at (-1 means no change)") \ 3258 \ 3259 product(intx, VMThreadPriority, -1, \ 3260 "what priority should VM threads run at (-1 means no change)") \ 3261 \ 3262 product(bool, CompilerThreadHintNoPreempt, true, \ 3263 "(Solaris only) Give compiler threads an extra quanta") \ 3264 \ 3265 product(bool, VMThreadHintNoPreempt, false, \ 3266 "(Solaris only) Give VM thread an extra quanta") \ 3267 \ 3268 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3269 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3270 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3271 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3272 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3273 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3274 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3275 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3276 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3277 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3278 \ 3279 /* compiler debugging */ \ 3280 notproduct(intx, CompileTheWorldStartAt, 1, \ 3281 "First class to consider when using +CompileTheWorld") \ 3282 \ 3283 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3284 "Last class to consider when using +CompileTheWorld") \ 3285 \ 3286 develop(intx, NewCodeParameter, 0, \ 3287 "Testing Only: Create a dedicated integer parameter before " \ 3288 "putback") \ 3289 \ 3290 /* new oopmap storage allocation */ \ 3291 develop(intx, MinOopMapAllocation, 8, \ 3292 "Minimum number of OopMap entries in an OopMapSet") \ 3293 \ 3294 /* Background Compilation */ \ 3295 develop(intx, LongCompileThreshold, 50, \ 3296 "Used with +TraceLongCompiles") \ 3297 \ 3298 product(intx, StarvationMonitorInterval, 200, \ 3299 "Pause between each check in ms") \ 3300 \ 3301 /* recompilation */ \ 3302 product_pd(intx, CompileThreshold, \ 3303 "number of interpreted method invocations before (re-)compiling") \ 3304 \ 3305 product_pd(intx, BackEdgeThreshold, \ 3306 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3307 \ 3308 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3309 "Interpreter (tier 0) invocation notification frequency.") \ 3310 \ 3311 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3312 "C1 without MDO (tier 2) invocation notification frequency.") \ 3313 \ 3314 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3315 "C1 with MDO profiling (tier 3) invocation notification " \ 3316 "frequency.") \ 3317 \ 3318 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3319 "Interpreter (tier 0) invocation notification frequency.") \ 3320 \ 3321 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3322 "C1 without MDO (tier 2) invocation notification frequency.") \ 3323 \ 3324 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3325 "C1 with MDO profiling (tier 3) invocation notification " \ 3326 "frequency.") \ 3327 \ 3328 product(intx, Tier2CompileThreshold, 0, \ 3329 "threshold at which tier 2 compilation is invoked") \ 3330 \ 3331 product(intx, Tier2BackEdgeThreshold, 0, \ 3332 "Back edge threshold at which tier 2 compilation is invoked") \ 3333 \ 3334 product(intx, Tier3InvocationThreshold, 200, \ 3335 "Compile if number of method invocations crosses this " \ 3336 "threshold") \ 3337 \ 3338 product(intx, Tier3MinInvocationThreshold, 100, \ 3339 "Minimum invocation to compile at tier 3") \ 3340 \ 3341 product(intx, Tier3CompileThreshold, 2000, \ 3342 "Threshold at which tier 3 compilation is invoked (invocation " \ 3343 "minimum must be satisfied.") \ 3344 \ 3345 product(intx, Tier3BackEdgeThreshold, 7000, \ 3346 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3347 \ 3348 product(intx, Tier4InvocationThreshold, 5000, \ 3349 "Compile if number of method invocations crosses this " \ 3350 "threshold") \ 3351 \ 3352 product(intx, Tier4MinInvocationThreshold, 600, \ 3353 "Minimum invocation to compile at tier 4") \ 3354 \ 3355 product(intx, Tier4CompileThreshold, 15000, \ 3356 "Threshold at which tier 4 compilation is invoked (invocation " \ 3357 "minimum must be satisfied.") \ 3358 \ 3359 product(intx, Tier4BackEdgeThreshold, 40000, \ 3360 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3361 \ 3362 product(intx, Tier3DelayOn, 5, \ 3363 "If C2 queue size grows over this amount per compiler thread " \ 3364 "stop compiling at tier 3 and start compiling at tier 2") \ 3365 \ 3366 product(intx, Tier3DelayOff, 2, \ 3367 "If C2 queue size is less than this amount per compiler thread " \ 3368 "allow methods compiled at tier 2 transition to tier 3") \ 3369 \ 3370 product(intx, Tier3LoadFeedback, 5, \ 3371 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3372 "reaches this amount per compiler thread") \ 3373 \ 3374 product(intx, Tier4LoadFeedback, 3, \ 3375 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3376 "reaches this amount per compiler thread") \ 3377 \ 3378 product(intx, TieredCompileTaskTimeout, 50, \ 3379 "Kill compile task if method was not used within " \ 3380 "given timeout in milliseconds") \ 3381 \ 3382 product(intx, TieredStopAtLevel, 4, \ 3383 "Stop at given compilation level") \ 3384 \ 3385 product(intx, Tier0ProfilingStartPercentage, 200, \ 3386 "Start profiling in interpreter if the counters exceed tier 3" \ 3387 "thresholds by the specified percentage") \ 3388 \ 3389 product(intx, TieredRateUpdateMinTime, 1, \ 3390 "Minimum rate sampling interval (in milliseconds)") \ 3391 \ 3392 product(intx, TieredRateUpdateMaxTime, 25, \ 3393 "Maximum rate sampling interval (in milliseconds)") \ 3394 \ 3395 product_pd(bool, TieredCompilation, \ 3396 "Enable tiered compilation") \ 3397 \ 3398 product(bool, PrintTieredEvents, false, \ 3399 "Print tiered events notifications") \ 3400 \ 3401 product(bool, StressTieredRuntime, false, \ 3402 "Alternate client and server compiler on compile requests") \ 3403 \ 3404 product_pd(intx, OnStackReplacePercentage, \ 3405 "NON_TIERED number of method invocations/branches (expressed as %"\ 3406 "of CompileThreshold) before (re-)compiling OSR code") \ 3407 \ 3408 product(intx, InterpreterProfilePercentage, 33, \ 3409 "NON_TIERED number of method invocations/branches (expressed as %"\ 3410 "of CompileThreshold) before profiling in the interpreter") \ 3411 \ 3412 develop(intx, MaxRecompilationSearchLength, 10, \ 3413 "max. # frames to inspect searching for recompilee") \ 3414 \ 3415 develop(intx, MaxInterpretedSearchLength, 3, \ 3416 "max. # interp. frames to skip when searching for recompilee") \ 3417 \ 3418 develop(intx, DesiredMethodLimit, 8000, \ 3419 "desired max. method size (in bytecodes) after inlining") \ 3420 \ 3421 develop(intx, HugeMethodLimit, 8000, \ 3422 "don't compile methods larger than this if " \ 3423 "+DontCompileHugeMethods") \ 3424 \ 3425 /* New JDK 1.4 reflection implementation */ \ 3426 \ 3427 develop(bool, UseNewReflection, true, \ 3428 "Temporary flag for transition to reflection based on dynamic " \ 3429 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3430 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3431 "changes were needed") \ 3432 \ 3433 develop(bool, VerifyReflectionBytecodes, false, \ 3434 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3435 "in situations like that described in 4486457 or for " \ 3436 "constructors generated for serialization, so can not be enabled "\ 3437 "in product.") \ 3438 \ 3439 product(bool, ReflectionWrapResolutionErrors, true, \ 3440 "Temporary flag for transition to AbstractMethodError wrapped " \ 3441 "in InvocationTargetException. See 6531596") \ 3442 \ 3443 \ 3444 develop(intx, FastSuperclassLimit, 8, \ 3445 "Depth of hardwired instanceof accelerator array") \ 3446 \ 3447 /* Properties for Java libraries */ \ 3448 \ 3449 product(intx, MaxDirectMemorySize, -1, \ 3450 "Maximum total size of NIO direct-buffer allocations") \ 3451 \ 3452 /* temporary developer defined flags */ \ 3453 \ 3454 diagnostic(bool, UseNewCode, false, \ 3455 "Testing Only: Use the new version while testing") \ 3456 \ 3457 diagnostic(bool, UseNewCode2, false, \ 3458 "Testing Only: Use the new version while testing") \ 3459 \ 3460 diagnostic(bool, UseNewCode3, false, \ 3461 "Testing Only: Use the new version while testing") \ 3462 \ 3463 /* flags for performance data collection */ \ 3464 \ 3465 product(bool, UsePerfData, true, \ 3466 "Flag to disable jvmstat instrumentation for performance testing" \ 3467 "and problem isolation purposes.") \ 3468 \ 3469 product(bool, PerfDataSaveToFile, false, \ 3470 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3471 \ 3472 product(ccstr, PerfDataSaveFile, NULL, \ 3473 "Save PerfData memory to the specified absolute pathname," \ 3474 "%p in the file name if present will be replaced by pid") \ 3475 \ 3476 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3477 "Data sampling interval in milliseconds") \ 3478 \ 3479 develop(bool, PerfTraceDataCreation, false, \ 3480 "Trace creation of Performance Data Entries") \ 3481 \ 3482 develop(bool, PerfTraceMemOps, false, \ 3483 "Trace PerfMemory create/attach/detach calls") \ 3484 \ 3485 product(bool, PerfDisableSharedMem, false, \ 3486 "Store performance data in standard memory") \ 3487 \ 3488 product(intx, PerfDataMemorySize, 32*K, \ 3489 "Size of performance data memory region. Will be rounded " \ 3490 "up to a multiple of the native os page size.") \ 3491 \ 3492 product(intx, PerfMaxStringConstLength, 1024, \ 3493 "Maximum PerfStringConstant string length before truncation") \ 3494 \ 3495 product(bool, PerfAllowAtExitRegistration, false, \ 3496 "Allow registration of atexit() methods") \ 3497 \ 3498 product(bool, PerfBypassFileSystemCheck, false, \ 3499 "Bypass Win32 file system criteria checks (Windows Only)") \ 3500 \ 3501 product(intx, UnguardOnExecutionViolation, 0, \ 3502 "Unguard page and retry on no-execute fault (Win32 only)" \ 3503 "0=off, 1=conservative, 2=aggressive") \ 3504 \ 3505 /* Serviceability Support */ \ 3506 \ 3507 product(bool, ManagementServer, false, \ 3508 "Create JMX Management Server") \ 3509 \ 3510 product(bool, DisableAttachMechanism, false, \ 3511 "Disable mechanism that allows tools to attach to this VM") \ 3512 \ 3513 product(bool, StartAttachListener, false, \ 3514 "Always start Attach Listener at VM startup") \ 3515 \ 3516 manageable(bool, PrintConcurrentLocks, false, \ 3517 "Print java.util.concurrent locks in thread dump") \ 3518 \ 3519 /* Shared spaces */ \ 3520 \ 3521 product(bool, UseSharedSpaces, true, \ 3522 "Use shared spaces in the permanent generation") \ 3523 \ 3524 product(bool, RequireSharedSpaces, false, \ 3525 "Require shared spaces in the permanent generation") \ 3526 \ 3527 product(bool, ForceSharedSpaces, false, \ 3528 "Require shared spaces in the permanent generation") \ 3529 \ 3530 product(bool, DumpSharedSpaces, false, \ 3531 "Special mode: JVM reads a class list, loads classes, builds " \ 3532 "shared spaces, and dumps the shared spaces to a file to be " \ 3533 "used in future JVM runs.") \ 3534 \ 3535 product(bool, PrintSharedSpaces, false, \ 3536 "Print usage of shared spaces") \ 3537 \ 3538 product(uintx, SharedDummyBlockSize, 512*M, \ 3539 "Size of dummy block used to shift heap addresses (in bytes)") \ 3540 \ 3541 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3542 "Size of read-write space in permanent generation (in bytes)") \ 3543 \ 3544 product(uintx, SharedReadOnlySize, 10*M, \ 3545 "Size of read-only space in permanent generation (in bytes)") \ 3546 \ 3547 product(uintx, SharedMiscDataSize, 4*M, \ 3548 "Size of the shared data area adjacent to the heap (in bytes)") \ 3549 \ 3550 product(uintx, SharedMiscCodeSize, 4*M, \ 3551 "Size of the shared code area adjacent to the heap (in bytes)") \ 3552 \ 3553 diagnostic(bool, SharedOptimizeColdStart, true, \ 3554 "At dump time, order shared objects to achieve better " \ 3555 "cold startup time.") \ 3556 \ 3557 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3558 "Reordering policy for SharedOptimizeColdStart " \ 3559 "0=favor classload-time locality, 1=balanced, " \ 3560 "2=favor runtime locality") \ 3561 \ 3562 diagnostic(bool, SharedSkipVerify, false, \ 3563 "Skip assert() and verify() which page-in unwanted shared " \ 3564 "objects. ") \ 3565 \ 3566 product(bool, AnonymousClasses, false, \ 3567 "support sun.misc.Unsafe.defineAnonymousClass") \ 3568 \ 3569 experimental(bool, EnableMethodHandles, false, \ 3570 "support method handles (true by default under JSR 292)") \ 3571 \ 3572 diagnostic(intx, MethodHandlePushLimit, 3, \ 3573 "number of additional stack slots a method handle may push") \ 3574 \ 3575 develop(bool, TraceMethodHandles, false, \ 3576 "trace internal method handle operations") \ 3577 \ 3578 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3579 "perform extra checks when constructing method handles") \ 3580 \ 3581 diagnostic(bool, OptimizeMethodHandles, true, \ 3582 "when constructing method handles, try to improve them") \ 3583 \ 3584 experimental(bool, TrustFinalNonStaticFields, false, \ 3585 "trust final non-static declarations for constant folding") \ 3586 \ 3587 experimental(bool, EnableInvokeDynamic, false, \ 3588 "recognize the invokedynamic instruction") \ 3589 \ 3590 experimental(bool, AllowTransitionalJSR292, true, \ 3591 "recognize pre-PFD formats of invokedynamic") \ 3592 \ 3593 develop(bool, TraceInvokeDynamic, false, \ 3594 "trace internal invoke dynamic operations") \ 3595 \ 3596 diagnostic(bool, PauseAtStartup, false, \ 3597 "Causes the VM to pause at startup time and wait for the pause " \ 3598 "file to be removed (default: ./vm.paused.<pid>)") \ 3599 \ 3600 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3601 "The file to create and for whose removal to await when pausing " \ 3602 "at startup. (default: ./vm.paused.<pid>)") \ 3603 \ 3604 product(bool, ExtendedDTraceProbes, false, \ 3605 "Enable performance-impacting dtrace probes") \ 3606 \ 3607 product(bool, DTraceMethodProbes, false, \ 3608 "Enable dtrace probes for method-entry and method-exit") \ 3609 \ 3610 product(bool, DTraceAllocProbes, false, \ 3611 "Enable dtrace probes for object allocation") \ 3612 \ 3613 product(bool, DTraceMonitorProbes, false, \ 3614 "Enable dtrace probes for monitor events") \ 3615 \ 3616 product(bool, RelaxAccessControlCheck, false, \ 3617 "Relax the access control checks in the verifier") \ 3618 \ 3619 diagnostic(bool, PrintDTraceDOF, false, \ 3620 "Print the DTrace DOF passed to the system for JSDT probes") \ 3621 \ 3622 product(bool, UseVMInterruptibleIO, false, \ 3623 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3624 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3625 " of this flag is true for JDK 6 and earliers") 3626 3627/* 3628 * Macros for factoring of globals 3629 */ 3630 3631// Interface macros 3632#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3633#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3634#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3635#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3636#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3637#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3638#ifdef PRODUCT 3639#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3640#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3641#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3642#else 3643#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3644#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3645#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3646#endif 3647// Special LP64 flags, product only needed for now. 3648#ifdef _LP64 3649#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3650#else 3651#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3652#endif // _LP64 3653 3654// Implementation macros 3655#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3656#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3657#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3658#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3659#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3660#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3661#ifdef PRODUCT 3662#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3663#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3664#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3665#else 3666#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3667#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3668#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3669#endif 3670#ifdef _LP64 3671#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3672#else 3673#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3674#endif // _LP64 3675 3676RUNTIME_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) 3677 3678RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3679