1 /* 2 * Copyright (c) 1997, 2018, 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 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/align.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 31 32 #include <float.h> // for DBL_MAX 33 34 // The larger HeapWordSize for 64bit requires larger heaps 35 // for the same application running in 64bit. See bug 4967770. 36 // The minimum alignment to a heap word size is done. Other 37 // parts of the memory system may require additional alignment 38 // and are responsible for those alignments. 39 #ifdef _LP64 40 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize) 41 #else 42 #define ScaleForWordSize(x) (x) 43 #endif 44 45 // use this for flags that are true per default in the tiered build 46 // but false in non-tiered builds, and vice versa 47 #ifdef TIERED 48 #define trueInTiered true 49 #define falseInTiered false 50 #else 51 #define trueInTiered false 52 #define falseInTiered true 53 #endif 54 55 #include CPU_HEADER(globals) 56 #include OS_HEADER(globals) 57 #include OS_CPU_HEADER(globals) 58 #ifdef COMPILER1 59 #include CPU_HEADER(c1_globals) 60 #include OS_HEADER(c1_globals) 61 #endif 62 #ifdef COMPILER2 63 #include CPU_HEADER(c2_globals) 64 #include OS_HEADER(c2_globals) 65 #endif 66 67 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI 68 define_pd_global(bool, BackgroundCompilation, false); 69 define_pd_global(bool, UseTLAB, false); 70 define_pd_global(bool, CICompileOSR, false); 71 define_pd_global(bool, UseTypeProfile, false); 72 define_pd_global(bool, UseOnStackReplacement, false); 73 define_pd_global(bool, InlineIntrinsics, false); 74 define_pd_global(bool, PreferInterpreterNativeStubs, true); 75 define_pd_global(bool, ProfileInterpreter, false); 76 define_pd_global(bool, ProfileTraps, false); 77 define_pd_global(bool, TieredCompilation, false); 78 79 define_pd_global(intx, CompileThreshold, 0); 80 81 define_pd_global(intx, OnStackReplacePercentage, 0); 82 define_pd_global(bool, ResizeTLAB, false); 83 define_pd_global(intx, FreqInlineSize, 0); 84 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 85 define_pd_global(bool, InlineClassNatives, true); 86 define_pd_global(bool, InlineUnsafeOps, true); 87 define_pd_global(uintx, InitialCodeCacheSize, 160*K); 88 define_pd_global(uintx, ReservedCodeCacheSize, 32*M); 89 define_pd_global(uintx, NonProfiledCodeHeapSize, 0); 90 define_pd_global(uintx, ProfiledCodeHeapSize, 0); 91 define_pd_global(uintx, NonNMethodCodeHeapSize, 32*M); 92 93 define_pd_global(uintx, CodeCacheExpansionSize, 32*K); 94 define_pd_global(uintx, CodeCacheMinBlockLength, 1); 95 define_pd_global(uintx, CodeCacheMinimumUseSpace, 200*K); 96 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 97 define_pd_global(bool, NeverActAsServerClassMachine, true); 98 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 99 #define CI_COMPILER_COUNT 0 100 #else 101 102 #if COMPILER2_OR_JVMCI 103 #define CI_COMPILER_COUNT 2 104 #else 105 #define CI_COMPILER_COUNT 1 106 #endif // COMPILER2_OR_JVMCI 107 108 #endif // no compilers 109 110 // use this for flags that are true by default in the debug version but 111 // false in the optimized version, and vice versa 112 #ifdef ASSERT 113 #define trueInDebug true 114 #define falseInDebug false 115 #else 116 #define trueInDebug false 117 #define falseInDebug true 118 #endif 119 120 // use this for flags that are true per default in the product build 121 // but false in development builds, and vice versa 122 #ifdef PRODUCT 123 #define trueInProduct true 124 #define falseInProduct false 125 #else 126 #define trueInProduct false 127 #define falseInProduct true 128 #endif 129 130 // develop flags are settable / visible only during development and are constant in the PRODUCT version 131 // product flags are always settable / visible 132 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 133 134 // A flag must be declared with one of the following types: 135 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 136 // The type "ccstr" is an alias for "const char*" and is used 137 // only in this file, because the macrology requires single-token type names. 138 139 // Note: Diagnostic options not meant for VM tuning or for product modes. 140 // They are to be used for VM quality assurance or field diagnosis 141 // of VM bugs. They are hidden so that users will not be encouraged to 142 // try them as if they were VM ordinary execution options. However, they 143 // are available in the product version of the VM. Under instruction 144 // from support engineers, VM customers can turn them on to collect 145 // diagnostic information about VM problems. To use a VM diagnostic 146 // option, you must first specify +UnlockDiagnosticVMOptions. 147 // (This master switch also affects the behavior of -Xprintflags.) 148 // 149 // experimental flags are in support of features that are not 150 // part of the officially supported product, but are available 151 // for experimenting with. They could, for example, be performance 152 // features that may not have undergone full or rigorous QA, but which may 153 // help performance in some cases and released for experimentation 154 // by the community of users and developers. This flag also allows one to 155 // be able to build a fully supported product that nonetheless also 156 // ships with some unsupported, lightly tested, experimental features. 157 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 158 // UnlockExperimentalVMOptions flag, which allows the control and 159 // modification of the experimental flags. 160 // 161 // Nota bene: neither diagnostic nor experimental options should be used casually, 162 // and they are not supported on production loads, except under explicit 163 // direction from support engineers. 164 // 165 // manageable flags are writeable external product flags. 166 // They are dynamically writeable through the JDK management interface 167 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 168 // These flags are external exported interface (see CCC). The list of 169 // manageable flags can be queried programmatically through the management 170 // interface. 171 // 172 // A flag can be made as "manageable" only if 173 // - the flag is defined in a CCC as an external exported interface. 174 // - the VM implementation supports dynamic setting of the flag. 175 // This implies that the VM must *always* query the flag variable 176 // and not reuse state related to the flag state at any given time. 177 // - you want the flag to be queried programmatically by the customers. 178 // 179 // product_rw flags are writeable internal product flags. 180 // They are like "manageable" flags but for internal/private use. 181 // The list of product_rw flags are internal/private flags which 182 // may be changed/removed in a future release. It can be set 183 // through the management interface to get/set value 184 // when the name of flag is supplied. 185 // 186 // A flag can be made as "product_rw" only if 187 // - the VM implementation supports dynamic setting of the flag. 188 // This implies that the VM must *always* query the flag variable 189 // and not reuse state related to the flag state at any given time. 190 // 191 // Note that when there is a need to support develop flags to be writeable, 192 // it can be done in the same way as product_rw. 193 // 194 // range is a macro that will expand to min and max arguments for range 195 // checking code if provided - see jvmFlagRangeList.hpp 196 // 197 // constraint is a macro that will expand to custom function call 198 // for constraint checking if provided - see jvmFlagConstraintList.hpp 199 // 200 // writeable is a macro that controls if and how the value can change during the runtime 201 // 202 // writeable(Always) is optional and allows the flag to have its value changed 203 // without any limitations at any time 204 // 205 // writeable(Once) flag value's can be only set once during the lifetime of VM 206 // 207 // writeable(CommandLineOnly) flag value's can be only set from command line 208 // (multiple times allowed) 209 // 210 211 212 #define RUNTIME_FLAGS(develop, \ 213 develop_pd, \ 214 product, \ 215 product_pd, \ 216 diagnostic, \ 217 diagnostic_pd, \ 218 experimental, \ 219 notproduct, \ 220 manageable, \ 221 product_rw, \ 222 lp64_product, \ 223 range, \ 224 constraint, \ 225 writeable) \ 226 \ 227 lp64_product(bool, UseCompressedOops, false, \ 228 "Use 32-bit object references in 64-bit VM. " \ 229 "lp64_product means flag is always constant in 32 bit VM") \ 230 \ 231 lp64_product(bool, UseCompressedClassPointers, false, \ 232 "Use 32-bit class pointers in 64-bit VM. " \ 233 "lp64_product means flag is always constant in 32 bit VM") \ 234 \ 235 notproduct(bool, CheckCompressedOops, true, \ 236 "Generate checks in encoding/decoding code in debug VM") \ 237 \ 238 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 239 "Heap allocation steps through preferred address regions to find" \ 240 " where it can allocate the heap. Number of steps to take per " \ 241 "region.") \ 242 range(1, max_uintx) \ 243 \ 244 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 245 "Default object alignment in bytes, 8 is minimum") \ 246 range(8, 256) \ 247 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 248 \ 249 product(bool, AssumeMP, true, \ 250 "(Deprecated) Instruct the VM to assume multiple processors are available")\ 251 \ 252 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 253 /* removal testing. It was supposed to be removed before FCS but has */ \ 254 /* been re-added (see 6401008) */ \ 255 product_pd(bool, UseMembar, \ 256 "(Unstable) Issues membars on thread state transitions") \ 257 \ 258 develop(bool, CleanChunkPoolAsync, true, \ 259 "Clean the chunk pool asynchronously") \ 260 \ 261 product_pd(bool, ThreadLocalHandshakes, \ 262 "Use thread-local polls instead of global poll for safepoints.") \ 263 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 264 \ 265 diagnostic(uint, HandshakeTimeout, 0, \ 266 "If nonzero set a timeout in milliseconds for handshakes") \ 267 \ 268 experimental(bool, AlwaysSafeConstructors, false, \ 269 "Force safe construction, as if all fields are final.") \ 270 \ 271 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 272 "Enable normal processing of flags relating to field diagnostics")\ 273 \ 274 experimental(bool, UnlockExperimentalVMOptions, false, \ 275 "Enable normal processing of flags relating to experimental " \ 276 "features") \ 277 \ 278 product(bool, JavaMonitorsInStackTrace, true, \ 279 "Print information about Java monitor locks when the stacks are" \ 280 "dumped") \ 281 \ 282 product_pd(bool, UseLargePages, \ 283 "Use large page memory") \ 284 \ 285 product_pd(bool, UseLargePagesIndividualAllocation, \ 286 "Allocate large pages individually for better affinity") \ 287 \ 288 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 289 "Fail large pages individual allocation") \ 290 \ 291 product(bool, UseLargePagesInMetaspace, false, \ 292 "Use large page memory in metaspace. " \ 293 "Only used if UseLargePages is enabled.") \ 294 \ 295 product(bool, UseNUMA, false, \ 296 "Use NUMA if available") \ 297 \ 298 product(bool, UseNUMAInterleaving, false, \ 299 "Interleave memory across NUMA nodes if available") \ 300 \ 301 product(size_t, NUMAInterleaveGranularity, 2*M, \ 302 "Granularity to use for NUMA interleaving on Windows OS") \ 303 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 304 \ 305 product(bool, ForceNUMA, false, \ 306 "Force NUMA optimizations on single-node/UMA systems") \ 307 \ 308 product(uintx, NUMAChunkResizeWeight, 20, \ 309 "Percentage (0-100) used to weight the current sample when " \ 310 "computing exponentially decaying average for " \ 311 "AdaptiveNUMAChunkSizing") \ 312 range(0, 100) \ 313 \ 314 product(size_t, NUMASpaceResizeRate, 1*G, \ 315 "Do not reallocate more than this amount per collection") \ 316 range(0, max_uintx) \ 317 \ 318 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 319 "Enable adaptive chunk sizing for NUMA") \ 320 \ 321 product(bool, NUMAStats, false, \ 322 "Print NUMA stats in detailed heap information") \ 323 \ 324 product(uintx, NUMAPageScanRate, 256, \ 325 "Maximum number of pages to include in the page scan procedure") \ 326 range(0, max_uintx) \ 327 \ 328 product_pd(bool, NeedsDeoptSuspend, \ 329 "True for register window machines (sparc/ia64)") \ 330 \ 331 product(intx, UseSSE, 99, \ 332 "Highest supported SSE instructions set on x86/x64") \ 333 range(0, 99) \ 334 \ 335 product(bool, UseAES, false, \ 336 "Control whether AES instructions are used when available") \ 337 \ 338 product(bool, UseFMA, false, \ 339 "Control whether FMA instructions are used when available") \ 340 \ 341 product(bool, UseSHA, false, \ 342 "Control whether SHA instructions are used when available") \ 343 \ 344 diagnostic(bool, UseGHASHIntrinsics, false, \ 345 "Use intrinsics for GHASH versions of crypto") \ 346 \ 347 product(size_t, LargePageSizeInBytes, 0, \ 348 "Large page size (0 to let VM choose the page size)") \ 349 range(0, max_uintx) \ 350 \ 351 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 352 "Use large pages if maximum heap is at least this big") \ 353 range(0, max_uintx) \ 354 \ 355 product(bool, ForceTimeHighResolution, false, \ 356 "Using high time resolution (for Win32 only)") \ 357 \ 358 develop(bool, TracePcPatching, false, \ 359 "Trace usage of frame::patch_pc") \ 360 \ 361 develop(bool, TraceRelocator, false, \ 362 "Trace the bytecode relocator") \ 363 \ 364 develop(bool, TraceLongCompiles, false, \ 365 "Print out every time compilation is longer than " \ 366 "a given threshold") \ 367 \ 368 develop(bool, SafepointALot, false, \ 369 "Generate a lot of safepoints. This works with " \ 370 "GuaranteedSafepointInterval") \ 371 \ 372 product_pd(bool, BackgroundCompilation, \ 373 "A thread requesting compilation is not blocked during " \ 374 "compilation") \ 375 \ 376 product(bool, PrintVMQWaitTime, false, \ 377 "Print out the waiting time in VM operation queue") \ 378 \ 379 product(bool, MethodFlushing, true, \ 380 "Reclamation of zombie and not-entrant methods") \ 381 \ 382 develop(bool, VerifyStack, false, \ 383 "Verify stack of each thread when it is entering a runtime call") \ 384 \ 385 diagnostic(bool, ForceUnreachable, false, \ 386 "Make all non code cache addresses to be unreachable by " \ 387 "forcing use of 64bit literal fixups") \ 388 \ 389 notproduct(bool, StressDerivedPointers, false, \ 390 "Force scavenge when a derived pointer is detected on stack " \ 391 "after rtm call") \ 392 \ 393 develop(bool, TraceDerivedPointers, false, \ 394 "Trace traversal of derived pointers on stack") \ 395 \ 396 notproduct(bool, TraceCodeBlobStacks, false, \ 397 "Trace stack-walk of codeblobs") \ 398 \ 399 product(bool, PrintJNIResolving, false, \ 400 "Used to implement -v:jni") \ 401 \ 402 notproduct(bool, PrintRewrites, false, \ 403 "Print methods that are being rewritten") \ 404 \ 405 product(bool, UseInlineCaches, true, \ 406 "Use Inline Caches for virtual calls ") \ 407 \ 408 diagnostic(bool, InlineArrayCopy, true, \ 409 "Inline arraycopy native that is known to be part of " \ 410 "base library DLL") \ 411 \ 412 diagnostic(bool, InlineObjectHash, true, \ 413 "Inline Object::hashCode() native that is known to be part " \ 414 "of base library DLL") \ 415 \ 416 diagnostic(bool, InlineNatives, true, \ 417 "Inline natives that are known to be part of base library DLL") \ 418 \ 419 diagnostic(bool, InlineMathNatives, true, \ 420 "Inline SinD, CosD, etc.") \ 421 \ 422 diagnostic(bool, InlineClassNatives, true, \ 423 "Inline Class.isInstance, etc") \ 424 \ 425 diagnostic(bool, InlineThreadNatives, true, \ 426 "Inline Thread.currentThread, etc") \ 427 \ 428 diagnostic(bool, InlineUnsafeOps, true, \ 429 "Inline memory ops (native methods) from Unsafe") \ 430 \ 431 product(bool, CriticalJNINatives, true, \ 432 "Check for critical JNI entry points") \ 433 \ 434 notproduct(bool, StressCriticalJNINatives, false, \ 435 "Exercise register saving code in critical natives") \ 436 \ 437 diagnostic(bool, UseAESIntrinsics, false, \ 438 "Use intrinsics for AES versions of crypto") \ 439 \ 440 diagnostic(bool, UseAESCTRIntrinsics, false, \ 441 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 442 \ 443 diagnostic(bool, UseSHA1Intrinsics, false, \ 444 "Use intrinsics for SHA-1 crypto hash function. " \ 445 "Requires that UseSHA is enabled.") \ 446 \ 447 diagnostic(bool, UseSHA256Intrinsics, false, \ 448 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 449 "Requires that UseSHA is enabled.") \ 450 \ 451 diagnostic(bool, UseSHA512Intrinsics, false, \ 452 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 453 "Requires that UseSHA is enabled.") \ 454 \ 455 diagnostic(bool, UseCRC32Intrinsics, false, \ 456 "use intrinsics for java.util.zip.CRC32") \ 457 \ 458 diagnostic(bool, UseCRC32CIntrinsics, false, \ 459 "use intrinsics for java.util.zip.CRC32C") \ 460 \ 461 diagnostic(bool, UseAdler32Intrinsics, false, \ 462 "use intrinsics for java.util.zip.Adler32") \ 463 \ 464 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 465 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 466 \ 467 diagnostic(ccstrlist, DisableIntrinsic, "", \ 468 "do not expand intrinsics whose (internal) names appear here") \ 469 \ 470 develop(bool, TraceCallFixup, false, \ 471 "Trace all call fixups") \ 472 \ 473 develop(bool, DeoptimizeALot, false, \ 474 "Deoptimize at every exit from the runtime system") \ 475 \ 476 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 477 "A comma separated list of bcis to deoptimize at") \ 478 \ 479 product(bool, DeoptimizeRandom, false, \ 480 "Deoptimize random frames on random exit from the runtime system")\ 481 \ 482 notproduct(bool, ZombieALot, false, \ 483 "Create zombies (non-entrant) at exit from the runtime system") \ 484 \ 485 product(bool, UnlinkSymbolsALot, false, \ 486 "Unlink unreferenced symbols from the symbol table at safepoints")\ 487 \ 488 notproduct(bool, WalkStackALot, false, \ 489 "Trace stack (no print) at every exit from the runtime system") \ 490 \ 491 product(bool, Debugging, false, \ 492 "Set when executing debug methods in debug.cpp " \ 493 "(to prevent triggering assertions)") \ 494 \ 495 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 496 "Enable strict checks that safepoints cannot happen for threads " \ 497 "that use NoSafepointVerifier") \ 498 \ 499 notproduct(bool, VerifyLastFrame, false, \ 500 "Verify oops on last frame on entry to VM") \ 501 \ 502 product(bool, FailOverToOldVerifier, true, \ 503 "Fail over to old verifier when split verifier fails") \ 504 \ 505 product(bool, SafepointTimeout, false, \ 506 "Time out and warn or fail after SafepointTimeoutDelay " \ 507 "milliseconds if failed to reach safepoint") \ 508 \ 509 develop(bool, DieOnSafepointTimeout, false, \ 510 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 511 \ 512 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 513 /* typically, at most a few retries are needed */ \ 514 product(intx, SuspendRetryCount, 50, \ 515 "Maximum retry count for an external suspend request") \ 516 range(0, max_intx) \ 517 \ 518 product(intx, SuspendRetryDelay, 5, \ 519 "Milliseconds to delay per retry (* current_retry_count)") \ 520 range(0, max_intx) \ 521 \ 522 product(bool, AssertOnSuspendWaitFailure, false, \ 523 "Assert/Guarantee on external suspend wait failure") \ 524 \ 525 product(bool, TraceSuspendWaitFailures, false, \ 526 "Trace external suspend wait failures") \ 527 \ 528 product(bool, MaxFDLimit, true, \ 529 "Bump the number of file descriptors to maximum in Solaris") \ 530 \ 531 diagnostic(bool, LogEvents, true, \ 532 "Enable the various ring buffer event logs") \ 533 \ 534 diagnostic(uintx, LogEventsBufferEntries, 10, \ 535 "Number of ring buffer event logs") \ 536 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 537 \ 538 product(bool, BytecodeVerificationRemote, true, \ 539 "Enable the Java bytecode verifier for remote classes") \ 540 \ 541 product(bool, BytecodeVerificationLocal, false, \ 542 "Enable the Java bytecode verifier for local classes") \ 543 \ 544 develop(bool, ForceFloatExceptions, trueInDebug, \ 545 "Force exceptions on FP stack under/overflow") \ 546 \ 547 develop(bool, VerifyStackAtCalls, false, \ 548 "Verify that the stack pointer is unchanged after calls") \ 549 \ 550 develop(bool, TraceJavaAssertions, false, \ 551 "Trace java language assertions") \ 552 \ 553 notproduct(bool, VerifyCodeCache, false, \ 554 "Verify code cache on memory allocation/deallocation") \ 555 \ 556 develop(bool, UseMallocOnly, false, \ 557 "Use only malloc/free for allocation (no resource area/arena)") \ 558 \ 559 develop(bool, PrintMallocStatistics, false, \ 560 "Print malloc/free statistics") \ 561 \ 562 develop(bool, ZapResourceArea, trueInDebug, \ 563 "Zap freed resource/arena space with 0xABABABAB") \ 564 \ 565 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 566 "Zap freed VM handle space with 0xBCBCBCBC") \ 567 \ 568 notproduct(bool, ZapStackSegments, trueInDebug, \ 569 "Zap allocated/freed stack segments with 0xFADFADED") \ 570 \ 571 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 572 "Zap unused heap space with 0xBAADBABE") \ 573 \ 574 develop(bool, CheckZapUnusedHeapArea, false, \ 575 "Check zapping of unused heap space") \ 576 \ 577 develop(bool, ZapFillerObjects, trueInDebug, \ 578 "Zap filler objects with 0xDEAFBABE") \ 579 \ 580 develop(bool, PrintVMMessages, true, \ 581 "Print VM messages on console") \ 582 \ 583 notproduct(uintx, ErrorHandlerTest, 0, \ 584 "If > 0, provokes an error after VM initialization; the value " \ 585 "determines which error to provoke. See test_error_handler() " \ 586 "in vmError.cpp.") \ 587 \ 588 notproduct(uintx, TestCrashInErrorHandler, 0, \ 589 "If > 0, provokes an error inside VM error handler (a secondary " \ 590 "crash). see test_error_handler() in vmError.cpp") \ 591 \ 592 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 593 "If true, tests SafeFetch inside error handler.") \ 594 \ 595 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 596 "If true, simulates an unresponsive error handler.") \ 597 \ 598 develop(bool, Verbose, false, \ 599 "Print additional debugging information from other modes") \ 600 \ 601 develop(bool, PrintMiscellaneous, false, \ 602 "Print uncategorized debugging information (requires +Verbose)") \ 603 \ 604 develop(bool, WizardMode, false, \ 605 "Print much more debugging information") \ 606 \ 607 product(bool, ShowMessageBoxOnError, false, \ 608 "Keep process alive on VM fatal error") \ 609 \ 610 product(bool, CreateCoredumpOnCrash, true, \ 611 "Create core/mini dump on VM fatal error") \ 612 \ 613 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 614 "Timeout, in seconds, to limit the time spent on writing an " \ 615 "error log in case of a crash.") \ 616 range(0, (uint64_t)max_jlong/1000) \ 617 \ 618 product_pd(bool, UseOSErrorReporting, \ 619 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 620 \ 621 product(bool, SuppressFatalErrorMessage, false, \ 622 "Report NO fatal error message (avoid deadlock)") \ 623 \ 624 product(ccstrlist, OnError, "", \ 625 "Run user-defined commands on fatal error; see VMError.cpp " \ 626 "for examples") \ 627 \ 628 product(ccstrlist, OnOutOfMemoryError, "", \ 629 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 630 \ 631 manageable(bool, HeapDumpBeforeFullGC, false, \ 632 "Dump heap to file before any major stop-the-world GC") \ 633 \ 634 manageable(bool, HeapDumpAfterFullGC, false, \ 635 "Dump heap to file after any major stop-the-world GC") \ 636 \ 637 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 638 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 639 \ 640 manageable(ccstr, HeapDumpPath, NULL, \ 641 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 642 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 643 "in the working directory)") \ 644 \ 645 develop(bool, BreakAtWarning, false, \ 646 "Execute breakpoint upon encountering VM warning") \ 647 \ 648 develop(bool, UseFakeTimers, false, \ 649 "Tell whether the VM should use system time or a fake timer") \ 650 \ 651 product(ccstr, NativeMemoryTracking, "off", \ 652 "Native memory tracking options") \ 653 \ 654 diagnostic(bool, PrintNMTStatistics, false, \ 655 "Print native memory tracking summary data if it is on") \ 656 \ 657 diagnostic(bool, LogCompilation, false, \ 658 "Log compilation activity in detail to LogFile") \ 659 \ 660 product(bool, PrintCompilation, false, \ 661 "Print compilations") \ 662 \ 663 diagnostic(bool, TraceNMethodInstalls, false, \ 664 "Trace nmethod installation") \ 665 \ 666 diagnostic(intx, ScavengeRootsInCode, 2, \ 667 "0: do not allow scavengable oops in the code cache; " \ 668 "1: allow scavenging from the code cache; " \ 669 "2: emit as many constants as the compiler can see") \ 670 range(0, 2) \ 671 \ 672 product(bool, AlwaysRestoreFPU, false, \ 673 "Restore the FPU control word after every JNI call (expensive)") \ 674 \ 675 diagnostic(bool, PrintCompilation2, false, \ 676 "Print additional statistics per compilation") \ 677 \ 678 diagnostic(bool, PrintAdapterHandlers, false, \ 679 "Print code generated for i2c/c2i adapters") \ 680 \ 681 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 682 "Verify that i2c/c2i adapters are called properly") \ 683 \ 684 develop(bool, VerifyAdapterSharing, false, \ 685 "Verify that the code for shared adapters is the equivalent") \ 686 \ 687 diagnostic(bool, PrintAssembly, false, \ 688 "Print assembly code (using external disassembler.so)") \ 689 \ 690 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 691 "Print options string passed to disassembler.so") \ 692 \ 693 notproduct(bool, PrintNMethodStatistics, false, \ 694 "Print a summary statistic for the generated nmethods") \ 695 \ 696 diagnostic(bool, PrintNMethods, false, \ 697 "Print assembly code for nmethods when generated") \ 698 \ 699 diagnostic(bool, PrintNativeNMethods, false, \ 700 "Print assembly code for native nmethods when generated") \ 701 \ 702 develop(bool, PrintDebugInfo, false, \ 703 "Print debug information for all nmethods when generated") \ 704 \ 705 develop(bool, PrintRelocations, false, \ 706 "Print relocation information for all nmethods when generated") \ 707 \ 708 develop(bool, PrintDependencies, false, \ 709 "Print dependency information for all nmethods when generated") \ 710 \ 711 develop(bool, PrintExceptionHandlers, false, \ 712 "Print exception handler tables for all nmethods when generated") \ 713 \ 714 develop(bool, StressCompiledExceptionHandlers, false, \ 715 "Exercise compiled exception handlers") \ 716 \ 717 develop(bool, InterceptOSException, false, \ 718 "Start debugger when an implicit OS (e.g. NULL) " \ 719 "exception happens") \ 720 \ 721 product(bool, PrintCodeCache, false, \ 722 "Print the code cache memory usage when exiting") \ 723 \ 724 develop(bool, PrintCodeCache2, false, \ 725 "Print detailed usage information on the code cache when exiting")\ 726 \ 727 product(bool, PrintCodeCacheOnCompilation, false, \ 728 "Print the code cache memory usage each time a method is " \ 729 "compiled") \ 730 \ 731 diagnostic(bool, PrintStubCode, false, \ 732 "Print generated stub code") \ 733 \ 734 product(bool, StackTraceInThrowable, true, \ 735 "Collect backtrace in throwable when exception happens") \ 736 \ 737 product(bool, OmitStackTraceInFastThrow, true, \ 738 "Omit backtraces for some 'hot' exceptions in optimized code") \ 739 \ 740 product(bool, ProfilerPrintByteCodeStatistics, false, \ 741 "Print bytecode statistics when dumping profiler output") \ 742 \ 743 product(bool, ProfilerRecordPC, false, \ 744 "Collect ticks for each 16 byte interval of compiled code") \ 745 \ 746 product(bool, ProfileVM, false, \ 747 "Profile ticks that fall within VM (either in the VM Thread " \ 748 "or VM code called through stubs)") \ 749 \ 750 product(bool, ProfileIntervals, false, \ 751 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 752 \ 753 notproduct(bool, ProfilerCheckIntervals, false, \ 754 "Collect and print information on spacing of profiler ticks") \ 755 \ 756 product(bool, PrintWarnings, true, \ 757 "Print JVM warnings to output stream") \ 758 \ 759 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 760 "Print warnings for stalled SpinLocks") \ 761 \ 762 product(bool, RegisterFinalizersAtInit, true, \ 763 "Register finalizable objects at end of Object.<init> or " \ 764 "after allocation") \ 765 \ 766 develop(bool, RegisterReferences, true, \ 767 "Tell whether the VM should register soft/weak/final/phantom " \ 768 "references") \ 769 \ 770 develop(bool, IgnoreRewrites, false, \ 771 "Suppress rewrites of bytecodes in the oopmap generator. " \ 772 "This is unsafe!") \ 773 \ 774 develop(bool, PrintCodeCacheExtension, false, \ 775 "Print extension of code cache") \ 776 \ 777 develop(bool, UsePrivilegedStack, true, \ 778 "Enable the security JVM functions") \ 779 \ 780 develop(bool, ProtectionDomainVerification, true, \ 781 "Verify protection domain before resolution in system dictionary")\ 782 \ 783 product(bool, ClassUnloading, true, \ 784 "Do unloading of classes") \ 785 \ 786 product(bool, ClassUnloadingWithConcurrentMark, true, \ 787 "Do unloading of classes with a concurrent marking cycle") \ 788 \ 789 develop(bool, DisableStartThread, false, \ 790 "Disable starting of additional Java threads " \ 791 "(for debugging only)") \ 792 \ 793 develop(bool, MemProfiling, false, \ 794 "Write memory usage profiling to log file") \ 795 \ 796 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 797 "Print the system dictionary at exit") \ 798 \ 799 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 800 "Dynamically resize system dictionaries as needed") \ 801 \ 802 product(bool, AlwaysLockClassLoader, false, \ 803 "Require the VM to acquire the class loader lock before calling " \ 804 "loadClass() even for class loaders registering " \ 805 "as parallel capable") \ 806 \ 807 product(bool, AllowParallelDefineClass, false, \ 808 "Allow parallel defineClass requests for class loaders " \ 809 "registering as parallel capable") \ 810 \ 811 product_pd(bool, DontYieldALot, \ 812 "Throw away obvious excess yield calls") \ 813 \ 814 develop(bool, UseDetachedThreads, true, \ 815 "Use detached threads that are recycled upon termination " \ 816 "(for Solaris only)") \ 817 \ 818 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 819 "Disable the use of stack guard pages if the JVM is loaded " \ 820 "on the primordial process thread") \ 821 \ 822 product(bool, UseLWPSynchronization, true, \ 823 "Use LWP-based instead of libthread-based synchronization " \ 824 "(SPARC only)") \ 825 \ 826 experimental(ccstr, SyncKnobs, NULL, \ 827 "(Unstable) Various monitor synchronization tunables") \ 828 \ 829 experimental(intx, EmitSync, 0, \ 830 "(Unsafe, Unstable) " \ 831 "Control emission of inline sync fast-path code") \ 832 \ 833 product(intx, MonitorBound, 0, "Bound Monitor population") \ 834 range(0, max_jint) \ 835 \ 836 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 837 \ 838 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 839 "Percentage of used monitors before triggering cleanup " \ 840 "safepoint which deflates monitors (0 is off). " \ 841 "The check is performed on GuaranteedSafepointInterval.") \ 842 range(0, 100) \ 843 \ 844 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 845 "Experimental Sync flags") \ 846 \ 847 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 848 \ 849 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 850 \ 851 experimental(intx, hashCode, 5, \ 852 "(Unstable) select hashCode generation algorithm") \ 853 \ 854 product(bool, FilterSpuriousWakeups, true, \ 855 "When true prevents OS-level spurious, or premature, wakeups " \ 856 "from Object.wait (Ignored for Windows)") \ 857 \ 858 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 859 \ 860 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 861 \ 862 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 863 \ 864 develop(bool, UsePthreads, false, \ 865 "Use pthread-based instead of libthread-based synchronization " \ 866 "(SPARC only)") \ 867 \ 868 product(bool, ReduceSignalUsage, false, \ 869 "Reduce the use of OS signals in Java and/or the VM") \ 870 \ 871 develop_pd(bool, ShareVtableStubs, \ 872 "Share vtable stubs (smaller code but worse branch prediction") \ 873 \ 874 develop(bool, LoadLineNumberTables, true, \ 875 "Tell whether the class file parser loads line number tables") \ 876 \ 877 develop(bool, LoadLocalVariableTables, true, \ 878 "Tell whether the class file parser loads local variable tables") \ 879 \ 880 develop(bool, LoadLocalVariableTypeTables, true, \ 881 "Tell whether the class file parser loads local variable type" \ 882 "tables") \ 883 \ 884 product(bool, AllowUserSignalHandlers, false, \ 885 "Do not complain if the application installs signal handlers " \ 886 "(Solaris & Linux only)") \ 887 \ 888 product(bool, UseSignalChaining, true, \ 889 "Use signal-chaining to invoke signal handlers installed " \ 890 "by the application (Solaris & Linux only)") \ 891 \ 892 product(bool, AllowJNIEnvProxy, false, \ 893 "Allow JNIEnv proxies for jdbx") \ 894 \ 895 product(bool, RestoreMXCSROnJNICalls, false, \ 896 "Restore MXCSR when returning from JNI calls") \ 897 \ 898 product(bool, CheckJNICalls, false, \ 899 "Verify all arguments to JNI calls") \ 900 \ 901 product(bool, UseFastJNIAccessors, true, \ 902 "Use optimized versions of Get<Primitive>Field") \ 903 \ 904 product(intx, MaxJNILocalCapacity, 65536, \ 905 "Maximum allowable local JNI handle capacity to " \ 906 "EnsureLocalCapacity() and PushLocalFrame(), " \ 907 "where <= 0 is unlimited, default: 65536") \ 908 range(min_intx, max_intx) \ 909 \ 910 product(bool, EagerXrunInit, false, \ 911 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 912 "but not all -Xrun libraries may support the state of the VM " \ 913 "at this time") \ 914 \ 915 product(bool, PreserveAllAnnotations, false, \ 916 "Preserve RuntimeInvisibleAnnotations as well " \ 917 "as RuntimeVisibleAnnotations") \ 918 \ 919 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 920 "Number of OutOfMemoryErrors preallocated with backtrace") \ 921 \ 922 product(bool, UseXMMForArrayCopy, false, \ 923 "Use SSE2 MOVQ instruction for Arraycopy") \ 924 \ 925 product(intx, FieldsAllocationStyle, 1, \ 926 "0 - type based with oops first, " \ 927 "1 - with oops last, " \ 928 "2 - oops in super and sub classes are together") \ 929 range(0, 2) \ 930 \ 931 product(bool, CompactFields, true, \ 932 "Allocate nonstatic fields in gaps between previous fields") \ 933 \ 934 notproduct(bool, PrintFieldLayout, false, \ 935 "Print field layout for each class") \ 936 \ 937 /* Need to limit the extent of the padding to reasonable size. */\ 938 /* 8K is well beyond the reasonable HW cache line size, even with */\ 939 /* aggressive prefetching, while still leaving the room for segregating */\ 940 /* among the distinct pages. */\ 941 product(intx, ContendedPaddingWidth, 128, \ 942 "How many bytes to pad the fields/classes marked @Contended with")\ 943 range(0, 8192) \ 944 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 945 \ 946 product(bool, EnableContended, true, \ 947 "Enable @Contended annotation support") \ 948 \ 949 product(bool, RestrictContended, true, \ 950 "Restrict @Contended to trusted classes") \ 951 \ 952 product(bool, UseBiasedLocking, true, \ 953 "Enable biased locking in JVM") \ 954 \ 955 product(intx, BiasedLockingStartupDelay, 0, \ 956 "Number of milliseconds to wait before enabling biased locking") \ 957 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 958 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 959 \ 960 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 961 "Print statistics of biased locking in JVM") \ 962 \ 963 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 964 "Threshold of number of revocations per type to try to " \ 965 "rebias all objects in the heap of that type") \ 966 range(0, max_intx) \ 967 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 968 \ 969 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 970 "Threshold of number of revocations per type to permanently " \ 971 "revoke biases of all objects in the heap of that type") \ 972 range(0, max_intx) \ 973 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 974 \ 975 product(intx, BiasedLockingDecayTime, 25000, \ 976 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 977 "type after previous bulk rebias") \ 978 range(500, max_intx) \ 979 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 980 \ 981 product(bool, ExitOnOutOfMemoryError, false, \ 982 "JVM exits on the first occurrence of an out-of-memory error") \ 983 \ 984 product(bool, CrashOnOutOfMemoryError, false, \ 985 "JVM aborts, producing an error log and core/mini dump, on the " \ 986 "first occurrence of an out-of-memory error") \ 987 \ 988 /* tracing */ \ 989 \ 990 develop(bool, StressRewriter, false, \ 991 "Stress linktime bytecode rewriting") \ 992 \ 993 product(ccstr, TraceJVMTI, NULL, \ 994 "Trace flags for JVMTI functions and events") \ 995 \ 996 /* This option can change an EMCP method into an obsolete method. */ \ 997 /* This can affect tests that except specific methods to be EMCP. */ \ 998 /* This option should be used with caution. */ \ 999 product(bool, StressLdcRewrite, false, \ 1000 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1001 \ 1002 /* change to false by default sometime after Mustang */ \ 1003 product(bool, VerifyMergedCPBytecodes, true, \ 1004 "Verify bytecodes after RedefineClasses constant pool merging") \ 1005 \ 1006 develop(bool, TraceBytecodes, false, \ 1007 "Trace bytecode execution") \ 1008 \ 1009 develop(bool, TraceICs, false, \ 1010 "Trace inline cache changes") \ 1011 \ 1012 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1013 "Trace method invocation counter overflow") \ 1014 \ 1015 develop(bool, TraceInlineCacheClearing, false, \ 1016 "Trace clearing of inline caches in nmethods") \ 1017 \ 1018 develop(bool, TraceDependencies, false, \ 1019 "Trace dependencies") \ 1020 \ 1021 develop(bool, VerifyDependencies, trueInDebug, \ 1022 "Exercise and verify the compilation dependency mechanism") \ 1023 \ 1024 develop(bool, TraceNewOopMapGeneration, false, \ 1025 "Trace OopMapGeneration") \ 1026 \ 1027 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1028 "Trace OopMapGeneration: print detailed cell states") \ 1029 \ 1030 develop(bool, TimeOopMap, false, \ 1031 "Time calls to GenerateOopMap::compute_map() in sum") \ 1032 \ 1033 develop(bool, TimeOopMap2, false, \ 1034 "Time calls to GenerateOopMap::compute_map() individually") \ 1035 \ 1036 develop(bool, TraceOopMapRewrites, false, \ 1037 "Trace rewriting of method oops during oop map generation") \ 1038 \ 1039 develop(bool, TraceICBuffer, false, \ 1040 "Trace usage of IC buffer") \ 1041 \ 1042 develop(bool, TraceCompiledIC, false, \ 1043 "Trace changes of compiled IC") \ 1044 \ 1045 /* gc */ \ 1046 \ 1047 product(bool, UseSerialGC, false, \ 1048 "Use the Serial garbage collector") \ 1049 \ 1050 product(bool, UseG1GC, false, \ 1051 "Use the Garbage-First garbage collector") \ 1052 \ 1053 product(bool, UseParallelGC, false, \ 1054 "Use the Parallel Scavenge garbage collector") \ 1055 \ 1056 product(bool, UseParallelOldGC, false, \ 1057 "Use the Parallel Old garbage collector") \ 1058 \ 1059 product(uintx, HeapMaximumCompactionInterval, 20, \ 1060 "How often should we maximally compact the heap (not allowing " \ 1061 "any dead space)") \ 1062 range(0, max_uintx) \ 1063 \ 1064 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1065 "The collection count for the first maximum compaction") \ 1066 range(0, max_uintx) \ 1067 \ 1068 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1069 "Use maximum compaction in the Parallel Old garbage collector " \ 1070 "for a system GC") \ 1071 \ 1072 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1073 "The mean used by the parallel compact dead wood " \ 1074 "limiter (a number between 0-100)") \ 1075 range(0, 100) \ 1076 \ 1077 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1078 "The standard deviation used by the parallel compact dead wood " \ 1079 "limiter (a number between 0-100)") \ 1080 range(0, 100) \ 1081 \ 1082 product(uint, ParallelGCThreads, 0, \ 1083 "Number of parallel threads parallel gc will use") \ 1084 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1085 \ 1086 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1087 "Use semaphore synchronization for the GC Threads, " \ 1088 "instead of synchronization based on mutexes") \ 1089 \ 1090 product(bool, UseDynamicNumberOfGCThreads, true, \ 1091 "Dynamically choose the number of threads up to a maximum of " \ 1092 "ParallelGCThreads parallel collectors will use for garbage " \ 1093 "collection work") \ 1094 \ 1095 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1096 "Inject thread creation failures for " \ 1097 "UseDynamicNumberOfGCThreads") \ 1098 \ 1099 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1100 "Force dynamic selection of the number of " \ 1101 "parallel threads parallel gc will use to aid debugging") \ 1102 \ 1103 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1104 "Size of heap (bytes) per GC thread used in calculating the " \ 1105 "number of GC threads") \ 1106 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1107 \ 1108 product(uint, ConcGCThreads, 0, \ 1109 "Number of threads concurrent gc will use") \ 1110 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1111 \ 1112 product(uint, GCTaskTimeStampEntries, 200, \ 1113 "Number of time stamp entries per gc worker thread") \ 1114 range(1, max_jint) \ 1115 \ 1116 product(bool, AlwaysTenure, false, \ 1117 "Always tenure objects in eden (ParallelGC only)") \ 1118 \ 1119 product(bool, NeverTenure, false, \ 1120 "Never tenure objects in eden, may tenure on overflow " \ 1121 "(ParallelGC only)") \ 1122 \ 1123 product(bool, ScavengeBeforeFullGC, true, \ 1124 "Scavenge youngest generation before each full GC.") \ 1125 \ 1126 product(bool, UseConcMarkSweepGC, false, \ 1127 "Use Concurrent Mark-Sweep GC in the old generation") \ 1128 \ 1129 product(bool, ExplicitGCInvokesConcurrent, false, \ 1130 "A System.gc() request invokes a concurrent collection; " \ 1131 "(effective only when using concurrent collectors)") \ 1132 \ 1133 product(bool, GCLockerInvokesConcurrent, false, \ 1134 "The exit of a JNI critical section necessitating a scavenge, " \ 1135 "also kicks off a background concurrent collection") \ 1136 \ 1137 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1138 "How much the GC can expand the eden by while the GC locker " \ 1139 "is active (as a percentage)") \ 1140 range(0, 100) \ 1141 \ 1142 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1143 "Number of times to retry allocations when " \ 1144 "blocked by the GC locker") \ 1145 range(0, max_uintx) \ 1146 \ 1147 product(bool, UseCMSBestFit, true, \ 1148 "Use CMS best fit allocation strategy") \ 1149 \ 1150 product(uintx, ParallelGCBufferWastePct, 10, \ 1151 "Wasted fraction of parallel allocation buffer") \ 1152 range(0, 100) \ 1153 \ 1154 product(uintx, TargetPLABWastePct, 10, \ 1155 "Target wasted space in last buffer as percent of overall " \ 1156 "allocation") \ 1157 range(1, 100) \ 1158 \ 1159 product(uintx, PLABWeight, 75, \ 1160 "Percentage (0-100) used to weight the current sample when " \ 1161 "computing exponentially decaying average for ResizePLAB") \ 1162 range(0, 100) \ 1163 \ 1164 product(bool, ResizePLAB, true, \ 1165 "Dynamically resize (survivor space) promotion LAB's") \ 1166 \ 1167 product(int, ParGCArrayScanChunk, 50, \ 1168 "Scan a subset of object array and push remainder, if array is " \ 1169 "bigger than this") \ 1170 range(1, max_jint/3) \ 1171 \ 1172 product(bool, ParGCUseLocalOverflow, false, \ 1173 "Instead of a global overflow list, use local overflow stacks") \ 1174 \ 1175 product(bool, ParGCTrimOverflow, true, \ 1176 "Eagerly trim the local overflow lists " \ 1177 "(when ParGCUseLocalOverflow)") \ 1178 \ 1179 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1180 "Simulate work queue overflow in ParNew") \ 1181 \ 1182 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1183 "An `interval' counter that determines how frequently " \ 1184 "we simulate overflow; a smaller number increases frequency") \ 1185 \ 1186 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1187 "The desired number of objects to claim from the overflow list") \ 1188 range(0, max_uintx) \ 1189 \ 1190 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1191 "The number of strides per worker thread that we divide up the " \ 1192 "card table scanning work into") \ 1193 range(1, max_uintx) \ 1194 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1195 \ 1196 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1197 "The number of cards in each chunk of the parallel chunks used " \ 1198 "during card table scanning") \ 1199 range(1, max_intx) \ 1200 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1201 \ 1202 product(uintx, OldPLABWeight, 50, \ 1203 "Percentage (0-100) used to weight the current sample when " \ 1204 "computing exponentially decaying average for resizing " \ 1205 "OldPLABSize") \ 1206 range(0, 100) \ 1207 \ 1208 product(bool, ResizeOldPLAB, true, \ 1209 "Dynamically resize (old gen) promotion LAB's") \ 1210 \ 1211 product(size_t, CMSOldPLABMax, 1024, \ 1212 "Maximum size of CMS gen promotion LAB caches per worker " \ 1213 "per block size") \ 1214 range(1, max_uintx) \ 1215 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1216 \ 1217 product(size_t, CMSOldPLABMin, 16, \ 1218 "Minimum size of CMS gen promotion LAB caches per worker " \ 1219 "per block size") \ 1220 range(1, max_uintx) \ 1221 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1222 \ 1223 product(uintx, CMSOldPLABNumRefills, 4, \ 1224 "Nominal number of refills of CMS gen promotion LAB cache " \ 1225 "per worker per block size") \ 1226 range(1, max_uintx) \ 1227 \ 1228 product(bool, CMSOldPLABResizeQuicker, false, \ 1229 "React on-the-fly during a scavenge to a sudden " \ 1230 "change in block demand rate") \ 1231 \ 1232 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1233 "The tolerance of the phase-change detector for on-the-fly " \ 1234 "PLAB resizing during a scavenge") \ 1235 range(1, max_uintx) \ 1236 \ 1237 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1238 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1239 "during a scavenge") \ 1240 range(1, max_uintx) \ 1241 \ 1242 product(bool, AlwaysPreTouch, false, \ 1243 "Force all freshly committed pages to be pre-touched") \ 1244 \ 1245 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1246 "Per-thread chunk size for parallel memory pre-touch.") \ 1247 range(1, SIZE_MAX / 2) \ 1248 \ 1249 product_pd(size_t, CMSYoungGenPerWorker, \ 1250 "The maximum size of young gen chosen by default per GC worker " \ 1251 "thread available") \ 1252 range(1, max_uintx) \ 1253 \ 1254 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1255 "Percentage (0-100) used to add conservatism when computing the " \ 1256 "duty cycle") \ 1257 range(0, 100) \ 1258 \ 1259 product(uintx, CMSExpAvgFactor, 50, \ 1260 "Percentage (0-100) used to weight the current sample when " \ 1261 "computing exponential averages for CMS statistics") \ 1262 range(0, 100) \ 1263 \ 1264 product(uintx, CMS_FLSWeight, 75, \ 1265 "Percentage (0-100) used to weight the current sample when " \ 1266 "computing exponentially decaying averages for CMS FLS " \ 1267 "statistics") \ 1268 range(0, 100) \ 1269 \ 1270 product(uintx, CMS_FLSPadding, 1, \ 1271 "The multiple of deviation from mean to use for buffering " \ 1272 "against volatility in free list demand") \ 1273 range(0, max_juint) \ 1274 \ 1275 product(uintx, FLSCoalescePolicy, 2, \ 1276 "CMS: aggressiveness level for coalescing, increasing " \ 1277 "from 0 to 4") \ 1278 range(0, 4) \ 1279 \ 1280 product(bool, FLSAlwaysCoalesceLarge, false, \ 1281 "CMS: larger free blocks are always available for coalescing") \ 1282 \ 1283 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1284 "CMS: the smaller the percentage the greater the coalescing " \ 1285 "force") \ 1286 range(0.0, 1.0) \ 1287 \ 1288 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1289 "CMS: the factor by which to inflate estimated demand of small " \ 1290 "block sizes to prevent coalescing with an adjoining block") \ 1291 range(0.0, DBL_MAX) \ 1292 \ 1293 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1294 "CMS: the factor by which to inflate estimated demand of large " \ 1295 "block sizes to prevent coalescing with an adjoining block") \ 1296 range(0.0, DBL_MAX) \ 1297 \ 1298 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1299 "CMS: the factor by which to inflate estimated demand of small " \ 1300 "block sizes to prevent splitting to supply demand for smaller " \ 1301 "blocks") \ 1302 range(0.0, DBL_MAX) \ 1303 \ 1304 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1305 "CMS: the factor by which to inflate estimated demand of large " \ 1306 "block sizes to prevent splitting to supply demand for smaller " \ 1307 "blocks") \ 1308 range(0.0, DBL_MAX) \ 1309 \ 1310 product(bool, CMSExtrapolateSweep, false, \ 1311 "CMS: cushion for block demand during sweep") \ 1312 \ 1313 product(uintx, CMS_SweepWeight, 75, \ 1314 "Percentage (0-100) used to weight the current sample when " \ 1315 "computing exponentially decaying average for inter-sweep " \ 1316 "duration") \ 1317 range(0, 100) \ 1318 \ 1319 product(uintx, CMS_SweepPadding, 1, \ 1320 "The multiple of deviation from mean to use for buffering " \ 1321 "against volatility in inter-sweep duration") \ 1322 range(0, max_juint) \ 1323 \ 1324 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1325 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1326 "duration exceeds this threshold in milliseconds") \ 1327 range(0, max_uintx) \ 1328 \ 1329 product(bool, CMSClassUnloadingEnabled, true, \ 1330 "Whether class unloading enabled when using CMS GC") \ 1331 \ 1332 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1333 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1334 "count for which classes may not be unloaded") \ 1335 range(0, max_uintx) \ 1336 \ 1337 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1338 "Replenish an indexed free list with this number of chunks") \ 1339 range(1, max_uintx) \ 1340 \ 1341 product(bool, CMSReplenishIntermediate, true, \ 1342 "Replenish all intermediate free-list caches") \ 1343 \ 1344 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1345 "When satisfying batched demand, split blocks from the " \ 1346 "IndexedFreeList whose size is a multiple of requested size") \ 1347 \ 1348 product(bool, CMSLoopWarn, false, \ 1349 "Warn in case of excessive CMS looping") \ 1350 \ 1351 /* where does the range max value of (max_jint - 1) come from? */ \ 1352 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1353 "Maximum size of marking stack") \ 1354 range(1, (max_jint - 1)) \ 1355 \ 1356 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1357 "Size of marking stack") \ 1358 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1359 \ 1360 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1361 "Simulate frequent marking stack / work queue overflow") \ 1362 \ 1363 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1364 "An \"interval\" counter that determines how frequently " \ 1365 "to simulate overflow; a smaller number increases frequency") \ 1366 \ 1367 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1368 "Maximum number of abortable preclean iterations, if > 0") \ 1369 range(0, max_uintx) \ 1370 \ 1371 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1372 "Maximum time in abortable preclean (in milliseconds)") \ 1373 range(0, max_intx) \ 1374 \ 1375 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1376 "Nominal minimum work per abortable preclean iteration") \ 1377 range(0, max_uintx) \ 1378 \ 1379 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1380 "Time that we sleep between iterations when not given " \ 1381 "enough work per iteration") \ 1382 range(0, max_intx) \ 1383 \ 1384 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \ 1385 product(size_t, CMSRescanMultiple, 32, \ 1386 "Size (in cards) of CMS parallel rescan task") \ 1387 range(1, SIZE_MAX / 4096) \ 1388 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1389 \ 1390 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \ 1391 product(size_t, CMSConcMarkMultiple, 32, \ 1392 "Size (in cards) of CMS concurrent MT marking task") \ 1393 range(1, SIZE_MAX / 4096) \ 1394 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1395 \ 1396 product(bool, CMSAbortSemantics, false, \ 1397 "Whether abort-on-overflow semantics is implemented") \ 1398 \ 1399 product(bool, CMSParallelInitialMarkEnabled, true, \ 1400 "Use the parallel initial mark.") \ 1401 \ 1402 product(bool, CMSParallelRemarkEnabled, true, \ 1403 "Whether parallel remark enabled (only if ParNewGC)") \ 1404 \ 1405 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1406 "Whether parallel remark of survivor space " \ 1407 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1408 \ 1409 product(bool, CMSPLABRecordAlways, true, \ 1410 "Always record survivor space PLAB boundaries (effective only " \ 1411 "if CMSParallelSurvivorRemarkEnabled)") \ 1412 \ 1413 product(bool, CMSEdenChunksRecordAlways, true, \ 1414 "Always record eden chunks used for the parallel initial mark " \ 1415 "or remark of eden") \ 1416 \ 1417 product(bool, CMSConcurrentMTEnabled, true, \ 1418 "Whether multi-threaded concurrent work enabled " \ 1419 "(effective only if ParNewGC)") \ 1420 \ 1421 product(bool, CMSPrecleaningEnabled, true, \ 1422 "Whether concurrent precleaning enabled") \ 1423 \ 1424 product(uintx, CMSPrecleanIter, 3, \ 1425 "Maximum number of precleaning iteration passes") \ 1426 range(0, 9) \ 1427 \ 1428 product(uintx, CMSPrecleanDenominator, 3, \ 1429 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1430 "ratio") \ 1431 range(1, max_uintx) \ 1432 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1433 \ 1434 product(uintx, CMSPrecleanNumerator, 2, \ 1435 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1436 "ratio") \ 1437 range(0, max_uintx-1) \ 1438 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1439 \ 1440 product(bool, CMSPrecleanRefLists1, true, \ 1441 "Preclean ref lists during (initial) preclean phase") \ 1442 \ 1443 product(bool, CMSPrecleanRefLists2, false, \ 1444 "Preclean ref lists during abortable preclean phase") \ 1445 \ 1446 product(bool, CMSPrecleanSurvivors1, false, \ 1447 "Preclean survivors during (initial) preclean phase") \ 1448 \ 1449 product(bool, CMSPrecleanSurvivors2, true, \ 1450 "Preclean survivors during abortable preclean phase") \ 1451 \ 1452 product(uintx, CMSPrecleanThreshold, 1000, \ 1453 "Do not iterate again if number of dirty cards is less than this")\ 1454 range(100, max_uintx) \ 1455 \ 1456 product(bool, CMSCleanOnEnter, true, \ 1457 "Clean-on-enter optimization for reducing number of dirty cards") \ 1458 \ 1459 product(uintx, CMSRemarkVerifyVariant, 1, \ 1460 "Choose variant (1,2) of verification following remark") \ 1461 range(1, 2) \ 1462 \ 1463 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1464 "If Eden size is below this, do not try to schedule remark") \ 1465 range(0, max_uintx) \ 1466 \ 1467 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1468 "The Eden occupancy percentage (0-100) at which " \ 1469 "to try and schedule remark pause") \ 1470 range(0, 100) \ 1471 \ 1472 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1473 "Start sampling eden top at least before young gen " \ 1474 "occupancy reaches 1/<ratio> of the size at which " \ 1475 "we plan to schedule remark") \ 1476 range(1, max_uintx) \ 1477 \ 1478 product(uintx, CMSSamplingGrain, 16*K, \ 1479 "The minimum distance between eden samples for CMS (see above)") \ 1480 range(ObjectAlignmentInBytes, max_uintx) \ 1481 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1482 \ 1483 product(bool, CMSScavengeBeforeRemark, false, \ 1484 "Attempt scavenge before the CMS remark step") \ 1485 \ 1486 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1487 "Don't drain below this size per parallel worker/thief") \ 1488 range(1, max_juint) \ 1489 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1490 \ 1491 manageable(intx, CMSWaitDuration, 2000, \ 1492 "Time in milliseconds that CMS thread waits for young GC") \ 1493 range(min_jint, max_jint) \ 1494 \ 1495 develop(uintx, CMSCheckInterval, 1000, \ 1496 "Interval in milliseconds that CMS thread checks if it " \ 1497 "should start a collection cycle") \ 1498 \ 1499 product(bool, CMSYield, true, \ 1500 "Yield between steps of CMS") \ 1501 \ 1502 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1503 "Bitmap operations should process at most this many bits " \ 1504 "between yields") \ 1505 range(1, max_uintx) \ 1506 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1507 \ 1508 product(bool, CMSPrintChunksInDump, false, \ 1509 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1510 "trace level include more detailed information about the" \ 1511 "free chunks") \ 1512 \ 1513 product(bool, CMSPrintObjectsInDump, false, \ 1514 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1515 "trace level include more detailed information about the" \ 1516 "allocated objects") \ 1517 \ 1518 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1519 "Verify that all references across the FLS boundary " \ 1520 "are to valid objects") \ 1521 \ 1522 diagnostic(bool, FLSVerifyLists, false, \ 1523 "Do lots of (expensive) FreeListSpace verification") \ 1524 \ 1525 diagnostic(bool, FLSVerifyIndexTable, false, \ 1526 "Do lots of (expensive) FLS index table verification") \ 1527 \ 1528 develop(bool, FLSVerifyDictionary, false, \ 1529 "Do lots of (expensive) FLS dictionary verification") \ 1530 \ 1531 develop(bool, VerifyBlockOffsetArray, false, \ 1532 "Do (expensive) block offset array verification") \ 1533 \ 1534 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1535 "Maintain _unallocated_block in BlockOffsetArray " \ 1536 "(currently applicable only to CMS collector)") \ 1537 \ 1538 product(intx, RefDiscoveryPolicy, 0, \ 1539 "Select type of reference discovery policy: " \ 1540 "reference-based(0) or referent-based(1)") \ 1541 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1542 ReferenceProcessor::DiscoveryPolicyMax) \ 1543 \ 1544 product(bool, ParallelRefProcEnabled, false, \ 1545 "Enable parallel reference processing whenever possible") \ 1546 \ 1547 product(bool, ParallelRefProcBalancingEnabled, true, \ 1548 "Enable balancing of reference processing queues") \ 1549 \ 1550 product(uintx, CMSTriggerRatio, 80, \ 1551 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1552 "allocated before a CMS collection cycle commences") \ 1553 range(0, 100) \ 1554 \ 1555 product(uintx, CMSBootstrapOccupancy, 50, \ 1556 "Percentage CMS generation occupancy at which to " \ 1557 "initiate CMS collection for bootstrapping collection stats") \ 1558 range(0, 100) \ 1559 \ 1560 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1561 "Percentage CMS generation occupancy to start a CMS collection " \ 1562 "cycle. A negative value means that CMSTriggerRatio is used") \ 1563 range(min_intx, 100) \ 1564 \ 1565 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1566 "The percent occupancy (IHOP) of the current old generation " \ 1567 "capacity above which a concurrent mark cycle will be initiated " \ 1568 "Its value may change over time if adaptive IHOP is enabled, " \ 1569 "otherwise the value remains constant. " \ 1570 "In the latter case a value of 0 will result as frequent as " \ 1571 "possible concurrent marking cycles. A value of 100 disables " \ 1572 "concurrent marking. " \ 1573 "Fragmentation waste in the old generation is not considered " \ 1574 "free space in this calculation. (G1 collector only)") \ 1575 range(0, 100) \ 1576 \ 1577 manageable(intx, CMSTriggerInterval, -1, \ 1578 "Commence a CMS collection cycle (at least) every so many " \ 1579 "milliseconds (0 permanently, -1 disabled)") \ 1580 range(-1, max_intx) \ 1581 \ 1582 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1583 "Only use occupancy as a criterion for starting a CMS collection")\ 1584 \ 1585 product(uintx, CMSIsTooFullPercentage, 98, \ 1586 "An absolute ceiling above which CMS will always consider the " \ 1587 "unloading of classes when class unloading is enabled") \ 1588 range(0, 100) \ 1589 \ 1590 develop(bool, CMSTestInFreeList, false, \ 1591 "Check if the coalesced range is already in the " \ 1592 "free lists as claimed") \ 1593 \ 1594 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1595 "Check that all the garbage collected was returned to the " \ 1596 "free lists") \ 1597 \ 1598 notproduct(bool, ScavengeALot, false, \ 1599 "Force scavenge at every Nth exit from the runtime system " \ 1600 "(N=ScavengeALotInterval)") \ 1601 \ 1602 develop(bool, FullGCALot, false, \ 1603 "Force full gc at every Nth exit from the runtime system " \ 1604 "(N=FullGCALotInterval)") \ 1605 \ 1606 notproduct(bool, GCALotAtAllSafepoints, false, \ 1607 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1608 \ 1609 notproduct(bool, PromotionFailureALot, false, \ 1610 "Use promotion failure handling on every youngest generation " \ 1611 "collection") \ 1612 \ 1613 develop(uintx, PromotionFailureALotCount, 1000, \ 1614 "Number of promotion failures occurring at PLAB " \ 1615 "refill attempts (ParNew) or promotion attempts " \ 1616 "(other young collectors)") \ 1617 \ 1618 develop(uintx, PromotionFailureALotInterval, 5, \ 1619 "Total collections between promotion failures a lot") \ 1620 \ 1621 experimental(uintx, WorkStealingSleepMillis, 1, \ 1622 "Sleep time when sleep is used for yields") \ 1623 \ 1624 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1625 "Number of yields before a sleep is done during work stealing") \ 1626 \ 1627 experimental(uintx, WorkStealingHardSpins, 4096, \ 1628 "Number of iterations in a spin loop between checks on " \ 1629 "time out of hard spin") \ 1630 \ 1631 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1632 "Ratio of hard spins to calls to yield") \ 1633 \ 1634 develop(uintx, ObjArrayMarkingStride, 2048, \ 1635 "Number of object array elements to push onto the marking stack " \ 1636 "before pushing a continuation entry") \ 1637 \ 1638 develop(bool, MetadataAllocationFailALot, false, \ 1639 "Fail metadata allocations at intervals controlled by " \ 1640 "MetadataAllocationFailALotInterval") \ 1641 \ 1642 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1643 "Metadata allocation failure a lot interval") \ 1644 \ 1645 notproduct(bool, ExecuteInternalVMTests, false, \ 1646 "Enable execution of internal VM tests") \ 1647 \ 1648 notproduct(bool, VerboseInternalVMTests, false, \ 1649 "Turn on logging for internal VM tests.") \ 1650 \ 1651 product(bool, ExecutingUnitTests, false, \ 1652 "Whether the JVM is running unit tests or not") \ 1653 \ 1654 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1655 \ 1656 product_pd(bool, ResizeTLAB, \ 1657 "Dynamically resize TLAB size for threads") \ 1658 \ 1659 product(bool, ZeroTLAB, false, \ 1660 "Zero out the newly created TLAB") \ 1661 \ 1662 product(bool, TLABStats, true, \ 1663 "Provide more detailed and expensive TLAB statistics.") \ 1664 \ 1665 product_pd(bool, NeverActAsServerClassMachine, \ 1666 "Never act like a server-class machine") \ 1667 \ 1668 product(bool, AlwaysActAsServerClassMachine, false, \ 1669 "Always act like a server-class machine") \ 1670 \ 1671 product_pd(uint64_t, MaxRAM, \ 1672 "Real memory size (in bytes) used to set maximum heap size") \ 1673 range(0, 0XFFFFFFFFFFFFFFFF) \ 1674 \ 1675 product(bool, AggressiveHeap, false, \ 1676 "Optimize heap options for long-running memory intensive apps") \ 1677 \ 1678 product(size_t, ErgoHeapSizeLimit, 0, \ 1679 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1680 "MaxRAM * MaxRAMPercentage / 100") \ 1681 range(0, max_uintx) \ 1682 \ 1683 product(uintx, MaxRAMFraction, 4, \ 1684 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1685 "size. " \ 1686 "Deprecated, use MaxRAMPercentage instead") \ 1687 range(1, max_uintx) \ 1688 \ 1689 product(uintx, MinRAMFraction, 2, \ 1690 "Minimum fraction (1/n) of real memory used for maximum heap " \ 1691 "size on systems with small physical memory size. " \ 1692 "Deprecated, use MinRAMPercentage instead") \ 1693 range(1, max_uintx) \ 1694 \ 1695 product(uintx, InitialRAMFraction, 64, \ 1696 "Fraction (1/n) of real memory used for initial heap size. " \ 1697 "Deprecated, use InitialRAMPercentage instead") \ 1698 range(1, max_uintx) \ 1699 \ 1700 product(double, MaxRAMPercentage, 25.0, \ 1701 "Maximum percentage of real memory used for maximum heap size") \ 1702 range(0.0, 100.0) \ 1703 \ 1704 product(double, MinRAMPercentage, 50.0, \ 1705 "Minimum percentage of real memory used for maximum heap" \ 1706 "size on systems with small physical memory size") \ 1707 range(0.0, 100.0) \ 1708 \ 1709 product(double, InitialRAMPercentage, 1.5625, \ 1710 "Percentage of real memory used for initial heap size") \ 1711 range(0.0, 100.0) \ 1712 \ 1713 product(int, ActiveProcessorCount, -1, \ 1714 "Specify the CPU count the VM should use and report as active") \ 1715 \ 1716 develop(uintx, MaxVirtMemFraction, 2, \ 1717 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 1718 "determining maximum heap size") \ 1719 \ 1720 product(bool, UseAdaptiveSizePolicy, true, \ 1721 "Use adaptive generation sizing policies") \ 1722 \ 1723 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1724 "Use adaptive survivor sizing policies") \ 1725 \ 1726 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1727 "Use adaptive young-old sizing policies at minor collections") \ 1728 \ 1729 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1730 "Use adaptive young-old sizing policies at major collections") \ 1731 \ 1732 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1733 "Include statistics from System.gc() for adaptive size policy") \ 1734 \ 1735 product(bool, UseAdaptiveGCBoundary, false, \ 1736 "Allow young-old boundary to move") \ 1737 \ 1738 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1739 "Resize the virtual spaces of the young or old generations") \ 1740 range(-1, 1) \ 1741 \ 1742 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1743 "Policy for changing generation size for throughput goals") \ 1744 range(0, 1) \ 1745 \ 1746 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1747 "Number of steps where heuristics is used before data is used") \ 1748 range(0, max_uintx) \ 1749 \ 1750 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1751 "Number of collections before the adaptive sizing is started") \ 1752 \ 1753 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1754 "Collection interval for printing information; zero means never") \ 1755 range(0, max_uintx) \ 1756 \ 1757 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1758 "Use adaptive minimum footprint as a goal") \ 1759 \ 1760 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1761 "Weight given to exponential resizing, between 0 and 100") \ 1762 range(0, 100) \ 1763 \ 1764 product(uintx, AdaptiveTimeWeight, 25, \ 1765 "Weight given to time in adaptive policy, between 0 and 100") \ 1766 range(0, 100) \ 1767 \ 1768 product(uintx, PausePadding, 1, \ 1769 "How much buffer to keep for pause time") \ 1770 range(0, max_juint) \ 1771 \ 1772 product(uintx, PromotedPadding, 3, \ 1773 "How much buffer to keep for promotion failure") \ 1774 range(0, max_juint) \ 1775 \ 1776 product(uintx, SurvivorPadding, 3, \ 1777 "How much buffer to keep for survivor overflow") \ 1778 range(0, max_juint) \ 1779 \ 1780 product(uintx, ThresholdTolerance, 10, \ 1781 "Allowed collection cost difference between generations") \ 1782 range(0, 100) \ 1783 \ 1784 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1785 "If collection costs are within margin, reduce both by full " \ 1786 "delta") \ 1787 range(0, 100) \ 1788 \ 1789 product(uintx, YoungGenerationSizeIncrement, 20, \ 1790 "Adaptive size percentage change in young generation") \ 1791 range(0, 100) \ 1792 \ 1793 product(uintx, YoungGenerationSizeSupplement, 80, \ 1794 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1795 range(0, 100) \ 1796 \ 1797 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1798 "Decay factor to YoungedGenerationSizeSupplement") \ 1799 range(1, max_uintx) \ 1800 \ 1801 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1802 "Adaptive size percentage change in tenured generation") \ 1803 range(0, 100) \ 1804 \ 1805 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1806 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1807 range(0, 100) \ 1808 \ 1809 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1810 "Decay factor to TenuredGenerationSizeIncrement") \ 1811 range(1, max_uintx) \ 1812 \ 1813 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 1814 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 1815 "or (G1 Only) the maximum GC time per MMU time slice") \ 1816 range(1, max_uintx - 1) \ 1817 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 1818 \ 1819 product(uintx, GCPauseIntervalMillis, 0, \ 1820 "Time slice for MMU specification") \ 1821 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 1822 \ 1823 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1824 "Adaptive size policy maximum GC minor pause time goal " \ 1825 "in millisecond") \ 1826 range(0, max_uintx) \ 1827 \ 1828 product(uintx, GCTimeRatio, 99, \ 1829 "Adaptive size policy application time to GC time ratio") \ 1830 range(0, max_juint) \ 1831 \ 1832 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1833 "Adaptive size scale down factor for shrinking") \ 1834 range(1, max_uintx) \ 1835 \ 1836 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1837 "Adaptive size decays the major cost for long major intervals") \ 1838 \ 1839 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1840 "Time scale over which major costs decay") \ 1841 range(0, max_uintx) \ 1842 \ 1843 product(uintx, MinSurvivorRatio, 3, \ 1844 "Minimum ratio of young generation/survivor space size") \ 1845 range(3, max_uintx) \ 1846 \ 1847 product(uintx, InitialSurvivorRatio, 8, \ 1848 "Initial ratio of young generation/survivor space size") \ 1849 range(0, max_uintx) \ 1850 \ 1851 product(size_t, BaseFootPrintEstimate, 256*M, \ 1852 "Estimate of footprint other than Java Heap") \ 1853 range(0, max_uintx) \ 1854 \ 1855 product(bool, UseGCOverheadLimit, true, \ 1856 "Use policy to limit of proportion of time spent in GC " \ 1857 "before an OutOfMemory error is thrown") \ 1858 \ 1859 product(uintx, GCTimeLimit, 98, \ 1860 "Limit of the proportion of time spent in GC before " \ 1861 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 1862 range(0, 100) \ 1863 \ 1864 product(uintx, GCHeapFreeLimit, 2, \ 1865 "Minimum percentage of free space after a full GC before an " \ 1866 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1867 range(0, 100) \ 1868 \ 1869 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 1870 "Number of consecutive collections before gc time limit fires") \ 1871 range(1, max_uintx) \ 1872 \ 1873 product(intx, PrefetchCopyIntervalInBytes, -1, \ 1874 "How far ahead to prefetch destination area (<= 0 means off)") \ 1875 range(-1, max_jint) \ 1876 \ 1877 product(intx, PrefetchScanIntervalInBytes, -1, \ 1878 "How far ahead to prefetch scan area (<= 0 means off)") \ 1879 range(-1, max_jint) \ 1880 \ 1881 product(intx, PrefetchFieldsAhead, -1, \ 1882 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 1883 range(-1, max_jint) \ 1884 \ 1885 diagnostic(bool, VerifyDuringStartup, false, \ 1886 "Verify memory system before executing any Java code " \ 1887 "during VM initialization") \ 1888 \ 1889 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 1890 "Verify system before exiting") \ 1891 \ 1892 diagnostic(bool, VerifyBeforeGC, false, \ 1893 "Verify memory system before GC") \ 1894 \ 1895 diagnostic(bool, VerifyAfterGC, false, \ 1896 "Verify memory system after GC") \ 1897 \ 1898 diagnostic(bool, VerifyDuringGC, false, \ 1899 "Verify memory system during GC (between phases)") \ 1900 \ 1901 diagnostic(ccstrlist, VerifyGCType, "", \ 1902 "GC type(s) to verify when Verify*GC is enabled." \ 1903 "Available types are collector specific.") \ 1904 \ 1905 diagnostic(ccstrlist, VerifySubSet, "", \ 1906 "Memory sub-systems to verify when Verify*GC flag(s) " \ 1907 "are enabled. One or more sub-systems can be specified " \ 1908 "in a comma separated string. Sub-systems are: " \ 1909 "threads, heap, symbol_table, string_table, codecache, " \ 1910 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 1911 "codecache_oops") \ 1912 \ 1913 diagnostic(bool, GCParallelVerificationEnabled, true, \ 1914 "Enable parallel memory system verification") \ 1915 \ 1916 diagnostic(bool, DeferInitialCardMark, false, \ 1917 "When +ReduceInitialCardMarks, explicitly defer any that " \ 1918 "may arise from new_pre_store_barrier") \ 1919 \ 1920 product(bool, UseCondCardMark, false, \ 1921 "Check for already marked card before updating card table") \ 1922 \ 1923 diagnostic(bool, VerifyRememberedSets, false, \ 1924 "Verify GC remembered sets") \ 1925 \ 1926 diagnostic(bool, VerifyObjectStartArray, true, \ 1927 "Verify GC object start array if verify before/after") \ 1928 \ 1929 product(bool, DisableExplicitGC, false, \ 1930 "Ignore calls to System.gc()") \ 1931 \ 1932 notproduct(bool, CheckMemoryInitialization, false, \ 1933 "Check memory initialization") \ 1934 \ 1935 diagnostic(bool, BindCMSThreadToCPU, false, \ 1936 "Bind CMS Thread to CPU if possible") \ 1937 \ 1938 diagnostic(uintx, CPUForCMSThread, 0, \ 1939 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 1940 range(0, max_juint) \ 1941 \ 1942 product(bool, BindGCTaskThreadsToCPUs, false, \ 1943 "Bind GCTaskThreads to CPUs if possible") \ 1944 \ 1945 product(bool, UseGCTaskAffinity, false, \ 1946 "Use worker affinity when asking for GCTasks") \ 1947 \ 1948 product(uintx, ProcessDistributionStride, 4, \ 1949 "Stride through processors when distributing processes") \ 1950 range(0, max_juint) \ 1951 \ 1952 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 1953 "Number of times the coordinator GC thread will sleep while " \ 1954 "yielding before giving up and resuming GC") \ 1955 range(0, max_juint) \ 1956 \ 1957 product(uintx, CMSYieldSleepCount, 0, \ 1958 "Number of times a GC thread (minus the coordinator) " \ 1959 "will sleep while yielding before giving up and resuming GC") \ 1960 range(0, max_juint) \ 1961 \ 1962 product(bool, PrintGC, false, \ 1963 "Print message at garbage collection. " \ 1964 "Deprecated, use -Xlog:gc instead.") \ 1965 \ 1966 product(bool, PrintGCDetails, false, \ 1967 "Print more details at garbage collection. " \ 1968 "Deprecated, use -Xlog:gc* instead.") \ 1969 \ 1970 develop(intx, ConcGCYieldTimeout, 0, \ 1971 "If non-zero, assert that GC threads yield within this " \ 1972 "number of milliseconds") \ 1973 range(0, max_intx) \ 1974 \ 1975 develop(bool, TraceFinalizerRegistration, false, \ 1976 "Trace registration of final references") \ 1977 \ 1978 notproduct(bool, TraceScavenge, false, \ 1979 "Trace scavenge") \ 1980 \ 1981 product(bool, IgnoreEmptyClassPaths, false, \ 1982 "Ignore empty path elements in -classpath") \ 1983 \ 1984 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 1985 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 1986 "Initial size of the boot class loader data metaspace") \ 1987 range(30*K, max_uintx/BytesPerWord) \ 1988 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 1989 \ 1990 product(bool, PrintHeapAtSIGBREAK, true, \ 1991 "Print heap layout in response to SIGBREAK") \ 1992 \ 1993 manageable(bool, PrintClassHistogram, false, \ 1994 "Print a histogram of class instances") \ 1995 \ 1996 develop(bool, TraceGCTaskManager, false, \ 1997 "Trace actions of the GC task manager") \ 1998 \ 1999 develop(bool, TraceGCTaskQueue, false, \ 2000 "Trace actions of the GC task queues") \ 2001 \ 2002 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2003 "Trace marking phase in ParallelOldGC") \ 2004 \ 2005 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2006 "Trace dense prefix computation for ParallelOldGC") \ 2007 \ 2008 develop(bool, IgnoreLibthreadGPFault, false, \ 2009 "Suppress workaround for libthread GP fault") \ 2010 \ 2011 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2012 "The percentage of the used heap that the instances of a class " \ 2013 "must occupy for the class to generate a trace event") \ 2014 range(0.0, 100.0) \ 2015 \ 2016 /* JVMTI heap profiling */ \ 2017 \ 2018 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2019 "Trace JVMTI object tagging calls") \ 2020 \ 2021 diagnostic(bool, VerifyBeforeIteration, false, \ 2022 "Verify memory system before JVMTI iteration") \ 2023 \ 2024 /* compiler interface */ \ 2025 \ 2026 develop(bool, CIPrintCompilerName, false, \ 2027 "when CIPrint is active, print the name of the active compiler") \ 2028 \ 2029 diagnostic(bool, CIPrintCompileQueue, false, \ 2030 "display the contents of the compile queue whenever a " \ 2031 "compilation is enqueued") \ 2032 \ 2033 develop(bool, CIPrintRequests, false, \ 2034 "display every request for compilation") \ 2035 \ 2036 product(bool, CITime, false, \ 2037 "collect timing information for compilation") \ 2038 \ 2039 develop(bool, CITimeVerbose, false, \ 2040 "be more verbose in compilation timings") \ 2041 \ 2042 develop(bool, CITimeEach, false, \ 2043 "display timing information after each successful compilation") \ 2044 \ 2045 develop(bool, CICountOSR, false, \ 2046 "use a separate counter when assigning ids to osr compilations") \ 2047 \ 2048 develop(bool, CICompileNatives, true, \ 2049 "compile native methods if supported by the compiler") \ 2050 \ 2051 develop_pd(bool, CICompileOSR, \ 2052 "compile on stack replacement methods if supported by the " \ 2053 "compiler") \ 2054 \ 2055 develop(bool, CIPrintMethodCodes, false, \ 2056 "print method bytecodes of the compiled code") \ 2057 \ 2058 develop(bool, CIPrintTypeFlow, false, \ 2059 "print the results of ciTypeFlow analysis") \ 2060 \ 2061 develop(bool, CITraceTypeFlow, false, \ 2062 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2063 \ 2064 develop(intx, OSROnlyBCI, -1, \ 2065 "OSR only at this bci. Negative values mean exclude that bci") \ 2066 \ 2067 /* compiler */ \ 2068 \ 2069 /* notice: the max range value here is max_jint, not max_intx */ \ 2070 /* because of overflow issue */ \ 2071 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2072 "Number of compiler threads to run") \ 2073 range(0, max_jint) \ 2074 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2075 \ 2076 product(intx, CompilationPolicyChoice, 0, \ 2077 "which compilation policy (0-3)") \ 2078 range(0, 3) \ 2079 \ 2080 develop(bool, UseStackBanging, true, \ 2081 "use stack banging for stack overflow checks (required for " \ 2082 "proper StackOverflow handling; disable only to measure cost " \ 2083 "of stackbanging)") \ 2084 \ 2085 develop(bool, UseStrictFP, true, \ 2086 "use strict fp if modifier strictfp is set") \ 2087 \ 2088 develop(bool, GenerateSynchronizationCode, true, \ 2089 "generate locking/unlocking code for synchronized methods and " \ 2090 "monitors") \ 2091 \ 2092 develop(bool, GenerateRangeChecks, true, \ 2093 "Generate range checks for array accesses") \ 2094 \ 2095 diagnostic_pd(bool, ImplicitNullChecks, \ 2096 "Generate code for implicit null checks") \ 2097 \ 2098 product_pd(bool, TrapBasedNullChecks, \ 2099 "Generate code for null checks that uses a cmp and trap " \ 2100 "instruction raising SIGTRAP. This is only used if an access to" \ 2101 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2102 "ImplicitNullChecks don't work (PPC64).") \ 2103 \ 2104 product(bool, PrintSafepointStatistics, false, \ 2105 "(Deprecated) Print statistics about safepoint synchronization") \ 2106 \ 2107 product(intx, PrintSafepointStatisticsCount, 300, \ 2108 "(Deprecated) Total number of safepoint statistics collected " \ 2109 "before printing them out") \ 2110 range(1, max_intx) \ 2111 \ 2112 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2113 "(Deprecated) Print safepoint statistics only when safepoint takes " \ 2114 "more than PrintSafepointSatisticsTimeout in millis") \ 2115 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2116 NOT_LP64(range(-1, max_intx)) \ 2117 \ 2118 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 2119 "Enable Thread SMR extra validity checks") \ 2120 \ 2121 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 2122 "Enable Thread SMR Statistics") \ 2123 \ 2124 product(bool, Inline, true, \ 2125 "Enable inlining") \ 2126 \ 2127 product(bool, ClipInlining, true, \ 2128 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2129 \ 2130 develop(bool, UseCHA, true, \ 2131 "Enable CHA") \ 2132 \ 2133 product(bool, UseTypeProfile, true, \ 2134 "Check interpreter profile for historically monomorphic calls") \ 2135 \ 2136 diagnostic(bool, PrintInlining, false, \ 2137 "Print inlining optimizations") \ 2138 \ 2139 product(bool, UsePopCountInstruction, false, \ 2140 "Use population count instruction") \ 2141 \ 2142 develop(bool, EagerInitialization, false, \ 2143 "Eagerly initialize classes if possible") \ 2144 \ 2145 diagnostic(bool, LogTouchedMethods, false, \ 2146 "Log methods which have been ever touched in runtime") \ 2147 \ 2148 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2149 "Print all methods that have been ever touched in runtime") \ 2150 \ 2151 develop(bool, TraceMethodReplacement, false, \ 2152 "Print when methods are replaced do to recompilation") \ 2153 \ 2154 develop(bool, PrintMethodFlushing, false, \ 2155 "Print the nmethods being flushed") \ 2156 \ 2157 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2158 "print statistics about method flushing") \ 2159 \ 2160 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2161 "Number of compiled code invocations after which " \ 2162 "the method is considered as hot by the flusher") \ 2163 range(1, max_jint) \ 2164 \ 2165 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2166 "Minimum number of sweeper passes before an nmethod " \ 2167 "can be flushed") \ 2168 range(0, max_intx) \ 2169 \ 2170 product(bool, UseCodeAging, true, \ 2171 "Insert counter to detect warm methods") \ 2172 \ 2173 diagnostic(bool, StressCodeAging, false, \ 2174 "Start with counters compiled in") \ 2175 \ 2176 develop(bool, StressCodeBuffers, false, \ 2177 "Exercise code buffer expansion and other rare state changes") \ 2178 \ 2179 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2180 "Generate extra debugging information for non-safepoints in " \ 2181 "nmethods") \ 2182 \ 2183 product(bool, PrintVMOptions, false, \ 2184 "Print flags that appeared on the command line") \ 2185 \ 2186 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2187 "Ignore unrecognized VM options") \ 2188 \ 2189 product(bool, PrintCommandLineFlags, false, \ 2190 "Print flags specified on command line or set by ergonomics") \ 2191 \ 2192 product(bool, PrintFlagsInitial, false, \ 2193 "Print all VM flags before argument processing and exit VM") \ 2194 \ 2195 product(bool, PrintFlagsFinal, false, \ 2196 "Print all VM flags after argument and ergonomic processing") \ 2197 \ 2198 notproduct(bool, PrintFlagsWithComments, false, \ 2199 "Print all VM flags with default values and descriptions and " \ 2200 "exit") \ 2201 \ 2202 product(bool, PrintFlagsRanges, false, \ 2203 "Print VM flags and their ranges and exit VM") \ 2204 \ 2205 diagnostic(bool, SerializeVMOutput, true, \ 2206 "Use a mutex to serialize output to tty and LogFile") \ 2207 \ 2208 diagnostic(bool, DisplayVMOutput, true, \ 2209 "Display all VM output on the tty, independently of LogVMOutput") \ 2210 \ 2211 diagnostic(bool, LogVMOutput, false, \ 2212 "Save VM output to LogFile") \ 2213 \ 2214 diagnostic(ccstr, LogFile, NULL, \ 2215 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2216 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2217 \ 2218 product(ccstr, ErrorFile, NULL, \ 2219 "If an error occurs, save the error data to this file " \ 2220 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2221 \ 2222 product(bool, DisplayVMOutputToStderr, false, \ 2223 "If DisplayVMOutput is true, display all VM output to stderr") \ 2224 \ 2225 product(bool, DisplayVMOutputToStdout, false, \ 2226 "If DisplayVMOutput is true, display all VM output to stdout") \ 2227 \ 2228 product(bool, UseHeavyMonitors, false, \ 2229 "use heavyweight instead of lightweight Java monitors") \ 2230 \ 2231 product(bool, PrintStringTableStatistics, false, \ 2232 "print statistics about the StringTable and SymbolTable") \ 2233 \ 2234 diagnostic(bool, VerifyStringTableAtExit, false, \ 2235 "verify StringTable contents at exit") \ 2236 \ 2237 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2238 "print histogram of the symbol table") \ 2239 \ 2240 notproduct(bool, ExitVMOnVerifyError, false, \ 2241 "standard exit from VM if bytecode verify error " \ 2242 "(only in debug mode)") \ 2243 \ 2244 diagnostic(ccstr, AbortVMOnException, NULL, \ 2245 "Call fatal if this exception is thrown. Example: " \ 2246 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2247 \ 2248 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2249 "Call fatal if the exception pointed by AbortVMOnException " \ 2250 "has this message") \ 2251 \ 2252 develop(bool, DebugVtables, false, \ 2253 "add debugging code to vtable dispatch") \ 2254 \ 2255 notproduct(bool, PrintVtableStats, false, \ 2256 "print vtables stats at end of run") \ 2257 \ 2258 develop(bool, TraceCreateZombies, false, \ 2259 "trace creation of zombie nmethods") \ 2260 \ 2261 notproduct(bool, IgnoreLockingAssertions, false, \ 2262 "disable locking assertions (for speed)") \ 2263 \ 2264 product(bool, RangeCheckElimination, true, \ 2265 "Eliminate range checks") \ 2266 \ 2267 develop_pd(bool, UncommonNullCast, \ 2268 "track occurrences of null in casts; adjust compiler tactics") \ 2269 \ 2270 develop(bool, TypeProfileCasts, true, \ 2271 "treat casts like calls for purposes of type profiling") \ 2272 \ 2273 develop(bool, DelayCompilationDuringStartup, true, \ 2274 "Delay invoking the compiler until main application class is " \ 2275 "loaded") \ 2276 \ 2277 develop(bool, CompileTheWorld, false, \ 2278 "Compile all methods in all classes in bootstrap class path " \ 2279 "(stress test)") \ 2280 \ 2281 develop(bool, CompileTheWorldPreloadClasses, true, \ 2282 "Preload all classes used by a class before start loading") \ 2283 \ 2284 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2285 "Force a safepoint every n compiles so sweeper can keep up") \ 2286 \ 2287 develop(bool, FillDelaySlots, true, \ 2288 "Fill delay slots (on SPARC only)") \ 2289 \ 2290 develop(bool, TimeLivenessAnalysis, false, \ 2291 "Time computation of bytecode liveness analysis") \ 2292 \ 2293 develop(bool, TraceLivenessGen, false, \ 2294 "Trace the generation of liveness analysis information") \ 2295 \ 2296 notproduct(bool, TraceLivenessQuery, false, \ 2297 "Trace queries of liveness analysis information") \ 2298 \ 2299 notproduct(bool, CollectIndexSetStatistics, false, \ 2300 "Collect information about IndexSets") \ 2301 \ 2302 develop(bool, UseLoopSafepoints, true, \ 2303 "Generate Safepoint nodes in every loop") \ 2304 \ 2305 develop(intx, FastAllocateSizeLimit, 128*K, \ 2306 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2307 "Inline allocations larger than this in doublewords must go slow")\ 2308 \ 2309 product(bool, AggressiveOpts, false, \ 2310 "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \ 2311 \ 2312 product_pd(bool, CompactStrings, \ 2313 "Enable Strings to use single byte chars in backing store") \ 2314 \ 2315 product_pd(uintx, TypeProfileLevel, \ 2316 "=XYZ, with Z: Type profiling of arguments at call; " \ 2317 "Y: Type profiling of return value at call; " \ 2318 "X: Type profiling of parameters to methods; " \ 2319 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2320 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2321 \ 2322 product(intx, TypeProfileArgsLimit, 2, \ 2323 "max number of call arguments to consider for type profiling") \ 2324 range(0, 16) \ 2325 \ 2326 product(intx, TypeProfileParmsLimit, 2, \ 2327 "max number of incoming parameters to consider for type profiling"\ 2328 ", -1 for all") \ 2329 range(-1, 64) \ 2330 \ 2331 /* statistics */ \ 2332 develop(bool, CountCompiledCalls, false, \ 2333 "Count method invocations") \ 2334 \ 2335 notproduct(bool, CountRuntimeCalls, false, \ 2336 "Count VM runtime calls") \ 2337 \ 2338 develop(bool, CountJNICalls, false, \ 2339 "Count jni method invocations") \ 2340 \ 2341 notproduct(bool, CountJVMCalls, false, \ 2342 "Count jvm method invocations") \ 2343 \ 2344 notproduct(bool, CountRemovableExceptions, false, \ 2345 "Count exceptions that could be replaced by branches due to " \ 2346 "inlining") \ 2347 \ 2348 notproduct(bool, ICMissHistogram, false, \ 2349 "Produce histogram of IC misses") \ 2350 \ 2351 /* interpreter */ \ 2352 product_pd(bool, RewriteBytecodes, \ 2353 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2354 \ 2355 product_pd(bool, RewriteFrequentPairs, \ 2356 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2357 \ 2358 diagnostic(bool, PrintInterpreter, false, \ 2359 "Print the generated interpreter code") \ 2360 \ 2361 product(bool, UseInterpreter, true, \ 2362 "Use interpreter for non-compiled methods") \ 2363 \ 2364 develop(bool, UseFastSignatureHandlers, true, \ 2365 "Use fast signature handlers for native calls") \ 2366 \ 2367 product(bool, UseLoopCounter, true, \ 2368 "Increment invocation counter on backward branch") \ 2369 \ 2370 product_pd(bool, UseOnStackReplacement, \ 2371 "Use on stack replacement, calls runtime if invoc. counter " \ 2372 "overflows in loop") \ 2373 \ 2374 notproduct(bool, TraceOnStackReplacement, false, \ 2375 "Trace on stack replacement") \ 2376 \ 2377 product_pd(bool, PreferInterpreterNativeStubs, \ 2378 "Use always interpreter stubs for native methods invoked via " \ 2379 "interpreter") \ 2380 \ 2381 develop(bool, CountBytecodes, false, \ 2382 "Count number of bytecodes executed") \ 2383 \ 2384 develop(bool, PrintBytecodeHistogram, false, \ 2385 "Print histogram of the executed bytecodes") \ 2386 \ 2387 develop(bool, PrintBytecodePairHistogram, false, \ 2388 "Print histogram of the executed bytecode pairs") \ 2389 \ 2390 diagnostic(bool, PrintSignatureHandlers, false, \ 2391 "Print code generated for native method signature handlers") \ 2392 \ 2393 develop(bool, VerifyOops, false, \ 2394 "Do plausibility checks for oops") \ 2395 \ 2396 develop(bool, CheckUnhandledOops, false, \ 2397 "Check for unhandled oops in VM code") \ 2398 \ 2399 develop(bool, VerifyJNIFields, trueInDebug, \ 2400 "Verify jfieldIDs for instance fields") \ 2401 \ 2402 notproduct(bool, VerifyJNIEnvThread, false, \ 2403 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2404 "from JNI") \ 2405 \ 2406 develop(bool, VerifyFPU, false, \ 2407 "Verify FPU state (check for NaN's, etc.)") \ 2408 \ 2409 develop(bool, VerifyThread, false, \ 2410 "Watch the thread register for corruption (SPARC only)") \ 2411 \ 2412 develop(bool, VerifyActivationFrameSize, false, \ 2413 "Verify that activation frame didn't become smaller than its " \ 2414 "minimal size") \ 2415 \ 2416 develop(bool, TraceFrequencyInlining, false, \ 2417 "Trace frequency based inlining") \ 2418 \ 2419 develop_pd(bool, InlineIntrinsics, \ 2420 "Inline intrinsics that can be statically resolved") \ 2421 \ 2422 product_pd(bool, ProfileInterpreter, \ 2423 "Profile at the bytecode level during interpretation") \ 2424 \ 2425 develop(bool, TraceProfileInterpreter, false, \ 2426 "Trace profiling at the bytecode level during interpretation. " \ 2427 "This outputs the profiling information collected to improve " \ 2428 "jit compilation.") \ 2429 \ 2430 develop_pd(bool, ProfileTraps, \ 2431 "Profile deoptimization traps at the bytecode level") \ 2432 \ 2433 product(intx, ProfileMaturityPercentage, 20, \ 2434 "number of method invocations/branches (expressed as % of " \ 2435 "CompileThreshold) before using the method's profile") \ 2436 range(0, 100) \ 2437 \ 2438 diagnostic(bool, PrintMethodData, false, \ 2439 "Print the results of +ProfileInterpreter at end of run") \ 2440 \ 2441 develop(bool, VerifyDataPointer, trueInDebug, \ 2442 "Verify the method data pointer during interpreter profiling") \ 2443 \ 2444 develop(bool, VerifyCompiledCode, false, \ 2445 "Include miscellaneous runtime verifications in nmethod code; " \ 2446 "default off because it disturbs nmethod size heuristics") \ 2447 \ 2448 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2449 "Manually make GC thread crash then dump java stack trace; " \ 2450 "Test only") \ 2451 \ 2452 /* compilation */ \ 2453 product(bool, UseCompiler, true, \ 2454 "Use Just-In-Time compilation") \ 2455 \ 2456 develop(bool, TraceCompilationPolicy, false, \ 2457 "Trace compilation policy") \ 2458 \ 2459 develop(bool, TimeCompilationPolicy, false, \ 2460 "Time the compilation policy") \ 2461 \ 2462 product(bool, UseCounterDecay, true, \ 2463 "Adjust recompilation counters") \ 2464 \ 2465 develop(intx, CounterHalfLifeTime, 30, \ 2466 "Half-life time of invocation counters (in seconds)") \ 2467 \ 2468 develop(intx, CounterDecayMinIntervalLength, 500, \ 2469 "The minimum interval (in milliseconds) between invocation of " \ 2470 "CounterDecay") \ 2471 \ 2472 product(bool, AlwaysCompileLoopMethods, false, \ 2473 "When using recompilation, never interpret methods " \ 2474 "containing loops") \ 2475 \ 2476 product(bool, DontCompileHugeMethods, true, \ 2477 "Do not compile methods > HugeMethodLimit") \ 2478 \ 2479 /* Bytecode escape analysis estimation. */ \ 2480 product(bool, EstimateArgEscape, true, \ 2481 "Analyze bytecodes to estimate escape state of arguments") \ 2482 \ 2483 product(intx, BCEATraceLevel, 0, \ 2484 "How much tracing to do of bytecode escape analysis estimates " \ 2485 "(0-3)") \ 2486 range(0, 3) \ 2487 \ 2488 product(intx, MaxBCEAEstimateLevel, 5, \ 2489 "Maximum number of nested calls that are analyzed by BC EA") \ 2490 range(0, max_jint) \ 2491 \ 2492 product(intx, MaxBCEAEstimateSize, 150, \ 2493 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2494 range(0, max_jint) \ 2495 \ 2496 product(intx, AllocatePrefetchStyle, 1, \ 2497 "0 = no prefetch, " \ 2498 "1 = generate prefetch instructions for each allocation, " \ 2499 "2 = use TLAB watermark to gate allocation prefetch, " \ 2500 "3 = generate one prefetch instruction per cache line") \ 2501 range(0, 3) \ 2502 \ 2503 product(intx, AllocatePrefetchDistance, -1, \ 2504 "Distance to prefetch ahead of allocation pointer. " \ 2505 "-1: use system-specific value (automatically determined") \ 2506 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2507 \ 2508 product(intx, AllocatePrefetchLines, 3, \ 2509 "Number of lines to prefetch ahead of array allocation pointer") \ 2510 range(1, 64) \ 2511 \ 2512 product(intx, AllocateInstancePrefetchLines, 1, \ 2513 "Number of lines to prefetch ahead of instance allocation " \ 2514 "pointer") \ 2515 range(1, 64) \ 2516 \ 2517 product(intx, AllocatePrefetchStepSize, 16, \ 2518 "Step size in bytes of sequential prefetch instructions") \ 2519 range(1, 512) \ 2520 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2521 \ 2522 product(intx, AllocatePrefetchInstr, 0, \ 2523 "Select instruction to prefetch ahead of allocation pointer") \ 2524 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2525 \ 2526 /* deoptimization */ \ 2527 develop(bool, TraceDeoptimization, false, \ 2528 "Trace deoptimization") \ 2529 \ 2530 develop(bool, PrintDeoptimizationDetails, false, \ 2531 "Print more information about deoptimization") \ 2532 \ 2533 develop(bool, DebugDeoptimization, false, \ 2534 "Tracing various information while debugging deoptimization") \ 2535 \ 2536 product(intx, SelfDestructTimer, 0, \ 2537 "Will cause VM to terminate after a given time (in minutes) " \ 2538 "(0 means off)") \ 2539 range(0, max_intx) \ 2540 \ 2541 product(intx, MaxJavaStackTraceDepth, 1024, \ 2542 "The maximum number of lines in the stack trace for Java " \ 2543 "exceptions (0 means all)") \ 2544 range(0, max_jint/2) \ 2545 \ 2546 /* notice: the max range value here is max_jint, not max_intx */ \ 2547 /* because of overflow issue */ \ 2548 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2549 "Guarantee a safepoint (at least) every so many milliseconds " \ 2550 "(0 means none)") \ 2551 range(0, max_jint) \ 2552 \ 2553 product(intx, SafepointTimeoutDelay, 10000, \ 2554 "Delay in milliseconds for option SafepointTimeout") \ 2555 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2556 NOT_LP64(range(0, max_intx)) \ 2557 \ 2558 product(intx, NmethodSweepActivity, 10, \ 2559 "Removes cold nmethods from code cache if > 0. Higher values " \ 2560 "result in more aggressive sweeping") \ 2561 range(0, 2000) \ 2562 \ 2563 notproduct(bool, LogSweeper, false, \ 2564 "Keep a ring buffer of sweeper activity") \ 2565 \ 2566 notproduct(intx, SweeperLogEntries, 1024, \ 2567 "Number of records in the ring buffer of sweeper activity") \ 2568 \ 2569 notproduct(intx, MemProfilingInterval, 500, \ 2570 "Time between each invocation of the MemProfiler") \ 2571 \ 2572 develop(intx, MallocCatchPtr, -1, \ 2573 "Hit breakpoint when mallocing/freeing this pointer") \ 2574 \ 2575 notproduct(ccstrlist, SuppressErrorAt, "", \ 2576 "List of assertions (file:line) to muzzle") \ 2577 \ 2578 develop(intx, StackPrintLimit, 100, \ 2579 "number of stack frames to print in VM-level stack dump") \ 2580 \ 2581 notproduct(intx, MaxElementPrintSize, 256, \ 2582 "maximum number of elements to print") \ 2583 \ 2584 notproduct(intx, MaxSubklassPrintSize, 4, \ 2585 "maximum number of subklasses to print when printing klass") \ 2586 \ 2587 product(intx, MaxInlineLevel, 9, \ 2588 "maximum number of nested calls that are inlined") \ 2589 range(0, max_jint) \ 2590 \ 2591 product(intx, MaxRecursiveInlineLevel, 1, \ 2592 "maximum number of nested recursive calls that are inlined") \ 2593 range(0, max_jint) \ 2594 \ 2595 develop(intx, MaxForceInlineLevel, 100, \ 2596 "maximum number of nested calls that are forced for inlining " \ 2597 "(using CompileCommand or marked w/ @ForceInline)") \ 2598 range(0, max_jint) \ 2599 \ 2600 product_pd(intx, InlineSmallCode, \ 2601 "Only inline already compiled methods if their code size is " \ 2602 "less than this") \ 2603 range(0, max_jint) \ 2604 \ 2605 product(intx, MaxInlineSize, 35, \ 2606 "The maximum bytecode size of a method to be inlined") \ 2607 range(0, max_jint) \ 2608 \ 2609 product_pd(intx, FreqInlineSize, \ 2610 "The maximum bytecode size of a frequent method to be inlined") \ 2611 range(0, max_jint) \ 2612 \ 2613 product(intx, MaxTrivialSize, 6, \ 2614 "The maximum bytecode size of a trivial method to be inlined") \ 2615 range(0, max_jint) \ 2616 \ 2617 product(intx, MinInliningThreshold, 250, \ 2618 "The minimum invocation count a method needs to have to be " \ 2619 "inlined") \ 2620 range(0, max_jint) \ 2621 \ 2622 develop(intx, MethodHistogramCutoff, 100, \ 2623 "The cutoff value for method invocation histogram (+CountCalls)") \ 2624 \ 2625 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2626 "Number of interpreted methods to show in profile") \ 2627 \ 2628 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2629 "Number of compiled methods to show in profile") \ 2630 \ 2631 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2632 "Number of stub methods to show in profile") \ 2633 \ 2634 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2635 "Number of runtime stub nodes to show in profile") \ 2636 \ 2637 product(intx, ProfileIntervalsTicks, 100, \ 2638 "Number of ticks between printing of interval profile " \ 2639 "(+ProfileIntervals)") \ 2640 range(0, max_intx) \ 2641 \ 2642 notproduct(intx, ScavengeALotInterval, 1, \ 2643 "Interval between which scavenge will occur with +ScavengeALot") \ 2644 \ 2645 notproduct(intx, FullGCALotInterval, 1, \ 2646 "Interval between which full gc will occur with +FullGCALot") \ 2647 \ 2648 notproduct(intx, FullGCALotStart, 0, \ 2649 "For which invocation to start FullGCAlot") \ 2650 \ 2651 notproduct(intx, FullGCALotDummies, 32*K, \ 2652 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2653 "to move") \ 2654 \ 2655 develop(intx, DontYieldALotInterval, 10, \ 2656 "Interval between which yields will be dropped (milliseconds)") \ 2657 \ 2658 develop(intx, ProfilerPCTickThreshold, 15, \ 2659 "Number of ticks in a PC buckets to be a hotspot") \ 2660 \ 2661 notproduct(intx, DeoptimizeALotInterval, 5, \ 2662 "Number of exits until DeoptimizeALot kicks in") \ 2663 \ 2664 notproduct(intx, ZombieALotInterval, 5, \ 2665 "Number of exits until ZombieALot kicks in") \ 2666 \ 2667 diagnostic(uintx, MallocMaxTestWords, 0, \ 2668 "If non-zero, maximum number of words that malloc/realloc can " \ 2669 "allocate (for testing only)") \ 2670 range(0, max_uintx) \ 2671 \ 2672 product(intx, TypeProfileWidth, 2, \ 2673 "Number of receiver types to record in call/cast profile") \ 2674 range(0, 8) \ 2675 \ 2676 develop(intx, BciProfileWidth, 2, \ 2677 "Number of return bci's to record in ret profile") \ 2678 \ 2679 product(intx, PerMethodRecompilationCutoff, 400, \ 2680 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2681 range(-1, max_intx) \ 2682 \ 2683 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2684 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2685 range(-1, max_intx) \ 2686 \ 2687 product(intx, PerMethodTrapLimit, 100, \ 2688 "Limit on traps (of one kind) in a method (includes inlines)") \ 2689 range(0, max_jint) \ 2690 \ 2691 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 2692 "Limit on speculative traps (of one kind) in a method " \ 2693 "(includes inlines)") \ 2694 range(0, max_jint) \ 2695 \ 2696 product(intx, PerBytecodeTrapLimit, 4, \ 2697 "Limit on traps (of one kind) at a particular BCI") \ 2698 range(0, max_jint) \ 2699 \ 2700 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 2701 "Extra method data trap entries for speculation") \ 2702 \ 2703 develop(intx, InlineFrequencyRatio, 20, \ 2704 "Ratio of call site execution to caller method invocation") \ 2705 range(0, max_jint) \ 2706 \ 2707 diagnostic_pd(intx, InlineFrequencyCount, \ 2708 "Count of call site execution necessary to trigger frequent " \ 2709 "inlining") \ 2710 range(0, max_jint) \ 2711 \ 2712 develop(intx, InlineThrowCount, 50, \ 2713 "Force inlining of interpreted methods that throw this often") \ 2714 range(0, max_jint) \ 2715 \ 2716 develop(intx, InlineThrowMaxSize, 200, \ 2717 "Force inlining of throwing methods smaller than this") \ 2718 range(0, max_jint) \ 2719 \ 2720 develop(intx, ProfilerNodeSize, 1024, \ 2721 "Size in K to allocate for the Profile Nodes of each thread") \ 2722 range(0, 1024) \ 2723 \ 2724 /* gc parameters */ \ 2725 product(size_t, InitialHeapSize, 0, \ 2726 "Initial heap size (in bytes); zero means use ergonomics") \ 2727 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 2728 \ 2729 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 2730 "Maximum heap size (in bytes)") \ 2731 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 2732 \ 2733 product(size_t, OldSize, ScaleForWordSize(4*M), \ 2734 "Initial tenured generation size (in bytes)") \ 2735 range(0, max_uintx) \ 2736 \ 2737 product(size_t, NewSize, ScaleForWordSize(1*M), \ 2738 "Initial new generation size (in bytes)") \ 2739 constraint(NewSizeConstraintFunc,AfterErgo) \ 2740 \ 2741 product(size_t, MaxNewSize, max_uintx, \ 2742 "Maximum new generation size (in bytes), max_uintx means set " \ 2743 "ergonomically") \ 2744 range(0, max_uintx) \ 2745 \ 2746 product_pd(size_t, HeapBaseMinAddress, \ 2747 "OS specific low limit for heap base address") \ 2748 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 2749 \ 2750 product(size_t, PretenureSizeThreshold, 0, \ 2751 "Maximum size in bytes of objects allocated in DefNew " \ 2752 "generation; zero means no maximum") \ 2753 range(0, max_uintx) \ 2754 \ 2755 product(size_t, MinTLABSize, 2*K, \ 2756 "Minimum allowed TLAB size (in bytes)") \ 2757 range(1, max_uintx/2) \ 2758 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 2759 \ 2760 product(size_t, TLABSize, 0, \ 2761 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2762 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 2763 \ 2764 product(size_t, YoungPLABSize, 4096, \ 2765 "Size of young gen promotion LAB's (in HeapWords)") \ 2766 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 2767 \ 2768 product(size_t, OldPLABSize, 1024, \ 2769 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 2770 "of blocks to attempt to claim when refilling CMS LAB's") \ 2771 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 2772 \ 2773 product(uintx, TLABAllocationWeight, 35, \ 2774 "Allocation averaging weight") \ 2775 range(0, 100) \ 2776 \ 2777 /* Limit the lower bound of this flag to 1 as it is used */ \ 2778 /* in a division expression. */ \ 2779 product(uintx, TLABWasteTargetPercent, 1, \ 2780 "Percentage of Eden that can be wasted") \ 2781 range(1, 100) \ 2782 \ 2783 product(uintx, TLABRefillWasteFraction, 64, \ 2784 "Maximum TLAB waste at a refill (internal fragmentation)") \ 2785 range(1, max_juint) \ 2786 \ 2787 product(uintx, TLABWasteIncrement, 4, \ 2788 "Increment allowed waste at slow allocation") \ 2789 range(0, max_jint) \ 2790 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 2791 \ 2792 product(uintx, SurvivorRatio, 8, \ 2793 "Ratio of eden/survivor space size") \ 2794 range(1, max_uintx-2) \ 2795 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 2796 \ 2797 product(uintx, NewRatio, 2, \ 2798 "Ratio of old/new generation sizes") \ 2799 range(0, max_uintx-1) \ 2800 \ 2801 product_pd(size_t, NewSizeThreadIncrease, \ 2802 "Additional size added to desired new generation size per " \ 2803 "non-daemon thread (in bytes)") \ 2804 range(0, max_uintx) \ 2805 \ 2806 product_pd(size_t, MetaspaceSize, \ 2807 "Initial threshold (in bytes) at which a garbage collection " \ 2808 "is done to reduce Metaspace usage") \ 2809 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 2810 \ 2811 product(size_t, MaxMetaspaceSize, max_uintx, \ 2812 "Maximum size of Metaspaces (in bytes)") \ 2813 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 2814 \ 2815 product(size_t, CompressedClassSpaceSize, 1*G, \ 2816 "Maximum size of class area in Metaspace when compressed " \ 2817 "class pointers are used") \ 2818 range(1*M, 3*G) \ 2819 \ 2820 manageable(uintx, MinHeapFreeRatio, 40, \ 2821 "The minimum percentage of heap free after GC to avoid expansion."\ 2822 " For most GCs this applies to the old generation. In G1 and" \ 2823 " ParallelGC it applies to the whole heap.") \ 2824 range(0, 100) \ 2825 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 2826 \ 2827 manageable(uintx, MaxHeapFreeRatio, 70, \ 2828 "The maximum percentage of heap free after GC to avoid shrinking."\ 2829 " For most GCs this applies to the old generation. In G1 and" \ 2830 " ParallelGC it applies to the whole heap.") \ 2831 range(0, 100) \ 2832 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 2833 \ 2834 product(bool, ShrinkHeapInSteps, true, \ 2835 "When disabled, informs the GC to shrink the java heap directly" \ 2836 " to the target size at the next full GC rather than requiring" \ 2837 " smaller steps during multiple full GCs.") \ 2838 \ 2839 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2840 "Number of milliseconds per MB of free space in the heap") \ 2841 range(0, max_intx) \ 2842 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 2843 \ 2844 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2845 "The minimum change in heap space due to GC (in bytes)") \ 2846 range(0, max_uintx) \ 2847 \ 2848 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 2849 "The minimum expansion of Metaspace (in bytes)") \ 2850 range(0, max_uintx) \ 2851 \ 2852 product(uintx, MaxMetaspaceFreeRatio, 70, \ 2853 "The maximum percentage of Metaspace free after GC to avoid " \ 2854 "shrinking") \ 2855 range(0, 100) \ 2856 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 2857 \ 2858 product(uintx, MinMetaspaceFreeRatio, 40, \ 2859 "The minimum percentage of Metaspace free after GC to avoid " \ 2860 "expansion") \ 2861 range(0, 99) \ 2862 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 2863 \ 2864 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 2865 "The maximum expansion of Metaspace without full GC (in bytes)") \ 2866 range(0, max_uintx) \ 2867 \ 2868 product(uintx, QueuedAllocationWarningCount, 0, \ 2869 "Number of times an allocation that queues behind a GC " \ 2870 "will retry before printing a warning") \ 2871 range(0, max_uintx) \ 2872 \ 2873 diagnostic(uintx, VerifyGCStartAt, 0, \ 2874 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 2875 range(0, max_uintx) \ 2876 \ 2877 diagnostic(intx, VerifyGCLevel, 0, \ 2878 "Generation level at which to start +VerifyBefore/AfterGC") \ 2879 range(0, 1) \ 2880 \ 2881 product(uintx, MaxTenuringThreshold, 15, \ 2882 "Maximum value for tenuring threshold") \ 2883 range(0, markOopDesc::max_age + 1) \ 2884 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 2885 \ 2886 product(uintx, InitialTenuringThreshold, 7, \ 2887 "Initial value for tenuring threshold") \ 2888 range(0, markOopDesc::max_age + 1) \ 2889 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 2890 \ 2891 product(uintx, TargetSurvivorRatio, 50, \ 2892 "Desired percentage of survivor space used after scavenge") \ 2893 range(0, 100) \ 2894 \ 2895 product(uintx, MarkSweepDeadRatio, 5, \ 2896 "Percentage (0-100) of the old gen allowed as dead wood. " \ 2897 "Serial mark sweep treats this as both the minimum and maximum " \ 2898 "value. " \ 2899 "CMS uses this value only if it falls back to mark sweep. " \ 2900 "Par compact uses a variable scale based on the density of the " \ 2901 "generation and treats this as the maximum value when the heap " \ 2902 "is either completely full or completely empty. Par compact " \ 2903 "also has a smaller default value; see arguments.cpp.") \ 2904 range(0, 100) \ 2905 \ 2906 product(uint, MarkSweepAlwaysCompactCount, 4, \ 2907 "How often should we fully compact the heap (ignoring the dead " \ 2908 "space parameters)") \ 2909 range(1, max_juint) \ 2910 \ 2911 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 2912 "Delay between expansion and allocation (in milliseconds)") \ 2913 \ 2914 develop(uintx, GCWorkerDelayMillis, 0, \ 2915 "Delay in scheduling GC workers (in milliseconds)") \ 2916 \ 2917 product(bool, PSChunkLargeArrays, true, \ 2918 "Process large arrays in chunks") \ 2919 \ 2920 product(uintx, GCDrainStackTargetSize, 64, \ 2921 "Number of entries we will try to leave on the stack " \ 2922 "during parallel gc") \ 2923 range(0, max_juint) \ 2924 \ 2925 /* stack parameters */ \ 2926 product_pd(intx, StackYellowPages, \ 2927 "Number of yellow zone (recoverable overflows) pages of size " \ 2928 "4KB. If pages are bigger yellow zone is aligned up.") \ 2929 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 2930 \ 2931 product_pd(intx, StackRedPages, \ 2932 "Number of red zone (unrecoverable overflows) pages of size " \ 2933 "4KB. If pages are bigger red zone is aligned up.") \ 2934 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 2935 \ 2936 product_pd(intx, StackReservedPages, \ 2937 "Number of reserved zone (reserved to annotated methods) pages" \ 2938 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 2939 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 2940 \ 2941 product(bool, RestrictReservedStack, true, \ 2942 "Restrict @ReservedStackAccess to trusted classes") \ 2943 \ 2944 /* greater stack shadow pages can't generate instruction to bang stack */ \ 2945 product_pd(intx, StackShadowPages, \ 2946 "Number of shadow zone (for overflow checking) pages of size " \ 2947 "4KB. If pages are bigger shadow zone is aligned up. " \ 2948 "This should exceed the depth of the VM and native call stack.") \ 2949 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 2950 \ 2951 product_pd(intx, ThreadStackSize, \ 2952 "Thread Stack Size (in Kbytes)") \ 2953 range(0, 1 * M) \ 2954 \ 2955 product_pd(intx, VMThreadStackSize, \ 2956 "Non-Java Thread Stack Size (in Kbytes)") \ 2957 range(0, max_intx/(1 * K)) \ 2958 \ 2959 product_pd(intx, CompilerThreadStackSize, \ 2960 "Compiler Thread Stack Size (in Kbytes)") \ 2961 range(0, max_intx/(1 * K)) \ 2962 \ 2963 develop_pd(size_t, JVMInvokeMethodSlack, \ 2964 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 2965 \ 2966 /* code cache parameters */ \ 2967 develop_pd(uintx, CodeCacheSegmentSize, \ 2968 "Code cache segment size (in bytes) - smallest unit of " \ 2969 "allocation") \ 2970 range(1, 1024) \ 2971 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 2972 \ 2973 develop_pd(intx, CodeEntryAlignment, \ 2974 "Code entry alignment for generated code (in bytes)") \ 2975 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 2976 \ 2977 product_pd(intx, OptoLoopAlignment, \ 2978 "Align inner loops to zero relative to this modulus") \ 2979 range(1, 16) \ 2980 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 2981 \ 2982 product_pd(uintx, InitialCodeCacheSize, \ 2983 "Initial code cache size (in bytes)") \ 2984 range(os::vm_page_size(), max_uintx) \ 2985 \ 2986 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 2987 "Minimum code cache size (in bytes) required to start VM.") \ 2988 range(0, max_uintx) \ 2989 \ 2990 product(bool, SegmentedCodeCache, false, \ 2991 "Use a segmented code cache") \ 2992 \ 2993 product_pd(uintx, ReservedCodeCacheSize, \ 2994 "Reserved code cache size (in bytes) - maximum code cache size") \ 2995 range(os::vm_page_size(), max_uintx) \ 2996 \ 2997 product_pd(uintx, NonProfiledCodeHeapSize, \ 2998 "Size of code heap with non-profiled methods (in bytes)") \ 2999 range(0, max_uintx) \ 3000 \ 3001 product_pd(uintx, ProfiledCodeHeapSize, \ 3002 "Size of code heap with profiled methods (in bytes)") \ 3003 range(0, max_uintx) \ 3004 \ 3005 product_pd(uintx, NonNMethodCodeHeapSize, \ 3006 "Size of code heap with non-nmethods (in bytes)") \ 3007 range(os::vm_page_size(), max_uintx) \ 3008 \ 3009 product_pd(uintx, CodeCacheExpansionSize, \ 3010 "Code cache expansion size (in bytes)") \ 3011 range(32*K, max_uintx) \ 3012 \ 3013 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 3014 "Minimum number of segments in a code cache block") \ 3015 range(1, 100) \ 3016 \ 3017 notproduct(bool, ExitOnFullCodeCache, false, \ 3018 "Exit the VM if we fill the code cache") \ 3019 \ 3020 product(bool, UseCodeCacheFlushing, true, \ 3021 "Remove cold/old nmethods from the code cache") \ 3022 \ 3023 product(uintx, StartAggressiveSweepingAt, 10, \ 3024 "Start aggressive sweeping if X[%] of the code cache is free." \ 3025 "Segmented code cache: X[%] of the non-profiled heap." \ 3026 "Non-segmented code cache: X[%] of the total code cache") \ 3027 range(0, 100) \ 3028 \ 3029 /* AOT parameters */ \ 3030 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3031 "Use AOT compiled files") \ 3032 \ 3033 product(ccstrlist, AOTLibrary, NULL, \ 3034 "AOT library") \ 3035 \ 3036 product(bool, PrintAOT, false, \ 3037 "Print used AOT klasses and methods") \ 3038 \ 3039 notproduct(bool, PrintAOTStatistics, false, \ 3040 "Print AOT statistics") \ 3041 \ 3042 diagnostic(bool, UseAOTStrictLoading, false, \ 3043 "Exit the VM if any of the AOT libraries has invalid config") \ 3044 \ 3045 product(bool, CalculateClassFingerprint, false, \ 3046 "Calculate class fingerprint") \ 3047 \ 3048 /* interpreter debugging */ \ 3049 develop(intx, BinarySwitchThreshold, 5, \ 3050 "Minimal number of lookupswitch entries for rewriting to binary " \ 3051 "switch") \ 3052 \ 3053 develop(intx, StopInterpreterAt, 0, \ 3054 "Stop interpreter execution at specified bytecode number") \ 3055 \ 3056 develop(intx, TraceBytecodesAt, 0, \ 3057 "Trace bytecodes starting with specified bytecode number") \ 3058 \ 3059 /* compiler interface */ \ 3060 develop(intx, CIStart, 0, \ 3061 "The id of the first compilation to permit") \ 3062 \ 3063 develop(intx, CIStop, max_jint, \ 3064 "The id of the last compilation to permit") \ 3065 \ 3066 develop(intx, CIStartOSR, 0, \ 3067 "The id of the first osr compilation to permit " \ 3068 "(CICountOSR must be on)") \ 3069 \ 3070 develop(intx, CIStopOSR, max_jint, \ 3071 "The id of the last osr compilation to permit " \ 3072 "(CICountOSR must be on)") \ 3073 \ 3074 develop(intx, CIBreakAtOSR, -1, \ 3075 "The id of osr compilation to break at") \ 3076 \ 3077 develop(intx, CIBreakAt, -1, \ 3078 "The id of compilation to break at") \ 3079 \ 3080 product(ccstrlist, CompileOnly, "", \ 3081 "List of methods (pkg/class.name) to restrict compilation to") \ 3082 \ 3083 product(ccstr, CompileCommandFile, NULL, \ 3084 "Read compiler commands from this file [.hotspot_compiler]") \ 3085 \ 3086 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3087 "Read compiler directives from this file") \ 3088 \ 3089 product(ccstrlist, CompileCommand, "", \ 3090 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3091 \ 3092 develop(bool, ReplayCompiles, false, \ 3093 "Enable replay of compilations from ReplayDataFile") \ 3094 \ 3095 product(ccstr, ReplayDataFile, NULL, \ 3096 "File containing compilation replay information" \ 3097 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3098 \ 3099 product(ccstr, InlineDataFile, NULL, \ 3100 "File containing inlining replay information" \ 3101 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3102 \ 3103 develop(intx, ReplaySuppressInitializers, 2, \ 3104 "Control handling of class initialization during replay: " \ 3105 "0 - don't do anything special; " \ 3106 "1 - treat all class initializers as empty; " \ 3107 "2 - treat class initializers for application classes as empty; " \ 3108 "3 - allow all class initializers to run during bootstrap but " \ 3109 " pretend they are empty after starting replay") \ 3110 range(0, 3) \ 3111 \ 3112 develop(bool, ReplayIgnoreInitErrors, false, \ 3113 "Ignore exceptions thrown during initialization for replay") \ 3114 \ 3115 product(bool, DumpReplayDataOnError, true, \ 3116 "Record replay data for crashing compiler threads") \ 3117 \ 3118 product(bool, CICompilerCountPerCPU, false, \ 3119 "1 compiler thread for log(N CPUs)") \ 3120 \ 3121 develop(intx, CIFireOOMAt, -1, \ 3122 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3123 "(non-negative value throws OOM after this many CI accesses " \ 3124 "in each compile)") \ 3125 notproduct(intx, CICrashAt, -1, \ 3126 "id of compilation to trigger assert in compiler thread for " \ 3127 "the purpose of testing, e.g. generation of replay data") \ 3128 notproduct(bool, CIObjectFactoryVerify, false, \ 3129 "enable potentially expensive verification in ciObjectFactory") \ 3130 \ 3131 /* Priorities */ \ 3132 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3133 \ 3134 product(intx, ThreadPriorityPolicy, 0, \ 3135 "0 : Normal. "\ 3136 " VM chooses priorities that are appropriate for normal "\ 3137 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3138 " to normal native priority. Java priorities below " \ 3139 " NORM_PRIORITY map to lower native priority values. On "\ 3140 " Windows applications are allowed to use higher native "\ 3141 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3142 " not use the highest possible native priority, "\ 3143 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3144 " system threads. On Linux thread priorities are ignored "\ 3145 " because the OS does not support static priority in "\ 3146 " SCHED_OTHER scheduling class which is the only choice for "\ 3147 " non-root, non-realtime applications. "\ 3148 "1 : Aggressive. "\ 3149 " Java thread priorities map over to the entire range of "\ 3150 " native thread priorities. Higher Java thread priorities map "\ 3151 " to higher native thread priorities. This policy should be "\ 3152 " used with care, as sometimes it can cause performance "\ 3153 " degradation in the application and/or the entire system. On "\ 3154 " Linux this policy requires root privilege.") \ 3155 range(0, 1) \ 3156 \ 3157 product(bool, ThreadPriorityVerbose, false, \ 3158 "Print priority changes") \ 3159 \ 3160 product(intx, CompilerThreadPriority, -1, \ 3161 "The native priority at which compiler threads should run " \ 3162 "(-1 means no change)") \ 3163 range(min_jint, max_jint) \ 3164 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3165 \ 3166 product(intx, VMThreadPriority, -1, \ 3167 "The native priority at which the VM thread should run " \ 3168 "(-1 means no change)") \ 3169 range(-1, 127) \ 3170 \ 3171 product(bool, CompilerThreadHintNoPreempt, false, \ 3172 "(Solaris only) Give compiler threads an extra quanta") \ 3173 \ 3174 product(bool, VMThreadHintNoPreempt, false, \ 3175 "(Solaris only) Give VM thread an extra quanta") \ 3176 \ 3177 product(intx, JavaPriority1_To_OSPriority, -1, \ 3178 "Map Java priorities to OS priorities") \ 3179 range(-1, 127) \ 3180 \ 3181 product(intx, JavaPriority2_To_OSPriority, -1, \ 3182 "Map Java priorities to OS priorities") \ 3183 range(-1, 127) \ 3184 \ 3185 product(intx, JavaPriority3_To_OSPriority, -1, \ 3186 "Map Java priorities to OS priorities") \ 3187 range(-1, 127) \ 3188 \ 3189 product(intx, JavaPriority4_To_OSPriority, -1, \ 3190 "Map Java priorities to OS priorities") \ 3191 range(-1, 127) \ 3192 \ 3193 product(intx, JavaPriority5_To_OSPriority, -1, \ 3194 "Map Java priorities to OS priorities") \ 3195 range(-1, 127) \ 3196 \ 3197 product(intx, JavaPriority6_To_OSPriority, -1, \ 3198 "Map Java priorities to OS priorities") \ 3199 range(-1, 127) \ 3200 \ 3201 product(intx, JavaPriority7_To_OSPriority, -1, \ 3202 "Map Java priorities to OS priorities") \ 3203 range(-1, 127) \ 3204 \ 3205 product(intx, JavaPriority8_To_OSPriority, -1, \ 3206 "Map Java priorities to OS priorities") \ 3207 range(-1, 127) \ 3208 \ 3209 product(intx, JavaPriority9_To_OSPriority, -1, \ 3210 "Map Java priorities to OS priorities") \ 3211 range(-1, 127) \ 3212 \ 3213 product(intx, JavaPriority10_To_OSPriority,-1, \ 3214 "Map Java priorities to OS priorities") \ 3215 range(-1, 127) \ 3216 \ 3217 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3218 "Java thread priority 10 maps to critical scheduling priority") \ 3219 \ 3220 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3221 "Compiler thread(s) run at critical scheduling priority") \ 3222 \ 3223 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3224 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3225 \ 3226 /* compiler debugging */ \ 3227 notproduct(intx, CompileTheWorldStartAt, 1, \ 3228 "First class to consider when using +CompileTheWorld") \ 3229 \ 3230 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3231 "Last class to consider when using +CompileTheWorld") \ 3232 \ 3233 develop(intx, NewCodeParameter, 0, \ 3234 "Testing Only: Create a dedicated integer parameter before " \ 3235 "putback") \ 3236 \ 3237 /* new oopmap storage allocation */ \ 3238 develop(intx, MinOopMapAllocation, 8, \ 3239 "Minimum number of OopMap entries in an OopMapSet") \ 3240 \ 3241 /* Background Compilation */ \ 3242 develop(intx, LongCompileThreshold, 50, \ 3243 "Used with +TraceLongCompiles") \ 3244 \ 3245 /* recompilation */ \ 3246 product_pd(intx, CompileThreshold, \ 3247 "number of interpreted method invocations before (re-)compiling") \ 3248 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3249 \ 3250 product(double, CompileThresholdScaling, 1.0, \ 3251 "Factor to control when first compilation happens " \ 3252 "(both with and without tiered compilation): " \ 3253 "values greater than 1.0 delay counter overflow, " \ 3254 "values between 0 and 1.0 rush counter overflow, " \ 3255 "value of 1.0 leaves compilation thresholds unchanged " \ 3256 "value of 0.0 is equivalent to -Xint. " \ 3257 "" \ 3258 "Flag can be set as per-method option. " \ 3259 "If a value is specified for a method, compilation thresholds " \ 3260 "for that method are scaled by both the value of the global flag "\ 3261 "and the value of the per-method flag.") \ 3262 range(0.0, DBL_MAX) \ 3263 \ 3264 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3265 "Interpreter (tier 0) invocation notification frequency") \ 3266 range(0, 30) \ 3267 \ 3268 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3269 "C1 without MDO (tier 2) invocation notification frequency") \ 3270 range(0, 30) \ 3271 \ 3272 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3273 "C1 with MDO profiling (tier 3) invocation notification " \ 3274 "frequency") \ 3275 range(0, 30) \ 3276 \ 3277 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3278 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3279 range(0, 30) \ 3280 \ 3281 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3282 "Interpreter (tier 0) invocation notification frequency") \ 3283 range(0, 30) \ 3284 \ 3285 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3286 "C1 without MDO (tier 2) invocation notification frequency") \ 3287 range(0, 30) \ 3288 \ 3289 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3290 "C1 with MDO profiling (tier 3) invocation notification " \ 3291 "frequency") \ 3292 range(0, 30) \ 3293 \ 3294 product(intx, Tier2CompileThreshold, 0, \ 3295 "threshold at which tier 2 compilation is invoked") \ 3296 range(0, max_jint) \ 3297 \ 3298 product(intx, Tier2BackEdgeThreshold, 0, \ 3299 "Back edge threshold at which tier 2 compilation is invoked") \ 3300 range(0, max_jint) \ 3301 \ 3302 product(intx, Tier3InvocationThreshold, 200, \ 3303 "Compile if number of method invocations crosses this " \ 3304 "threshold") \ 3305 range(0, max_jint) \ 3306 \ 3307 product(intx, Tier3MinInvocationThreshold, 100, \ 3308 "Minimum invocation to compile at tier 3") \ 3309 range(0, max_jint) \ 3310 \ 3311 product(intx, Tier3CompileThreshold, 2000, \ 3312 "Threshold at which tier 3 compilation is invoked (invocation " \ 3313 "minimum must be satisfied)") \ 3314 range(0, max_jint) \ 3315 \ 3316 product(intx, Tier3BackEdgeThreshold, 60000, \ 3317 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3318 range(0, max_jint) \ 3319 \ 3320 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3321 "Compile if number of method invocations crosses this " \ 3322 "threshold if coming from AOT") \ 3323 range(0, max_jint) \ 3324 \ 3325 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3326 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3327 range(0, max_jint) \ 3328 \ 3329 product(intx, Tier3AOTCompileThreshold, 15000, \ 3330 "Threshold at which tier 3 compilation is invoked (invocation " \ 3331 "minimum must be satisfied) if coming from AOT") \ 3332 range(0, max_jint) \ 3333 \ 3334 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3335 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3336 "if coming from AOT") \ 3337 range(0, max_jint) \ 3338 \ 3339 product(intx, Tier4InvocationThreshold, 5000, \ 3340 "Compile if number of method invocations crosses this " \ 3341 "threshold") \ 3342 range(0, max_jint) \ 3343 \ 3344 product(intx, Tier4MinInvocationThreshold, 600, \ 3345 "Minimum invocation to compile at tier 4") \ 3346 range(0, max_jint) \ 3347 \ 3348 product(intx, Tier4CompileThreshold, 15000, \ 3349 "Threshold at which tier 4 compilation is invoked (invocation " \ 3350 "minimum must be satisfied") \ 3351 range(0, max_jint) \ 3352 \ 3353 product(intx, Tier4BackEdgeThreshold, 40000, \ 3354 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3355 range(0, max_jint) \ 3356 \ 3357 product(intx, Tier3DelayOn, 5, \ 3358 "If C2 queue size grows over this amount per compiler thread " \ 3359 "stop compiling at tier 3 and start compiling at tier 2") \ 3360 range(0, max_jint) \ 3361 \ 3362 product(intx, Tier3DelayOff, 2, \ 3363 "If C2 queue size is less than this amount per compiler thread " \ 3364 "allow methods compiled at tier 2 transition to tier 3") \ 3365 range(0, max_jint) \ 3366 \ 3367 product(intx, Tier3LoadFeedback, 5, \ 3368 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3369 "reaches this amount per compiler thread") \ 3370 range(0, max_jint) \ 3371 \ 3372 product(intx, Tier4LoadFeedback, 3, \ 3373 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3374 "reaches this amount per compiler thread") \ 3375 range(0, max_jint) \ 3376 \ 3377 product(intx, TieredCompileTaskTimeout, 50, \ 3378 "Kill compile task if method was not used within " \ 3379 "given timeout in milliseconds") \ 3380 range(0, max_intx) \ 3381 \ 3382 product(intx, TieredStopAtLevel, 4, \ 3383 "Stop at given compilation level") \ 3384 range(0, 4) \ 3385 \ 3386 product(intx, Tier0ProfilingStartPercentage, 200, \ 3387 "Start profiling in interpreter if the counters exceed tier 3 " \ 3388 "thresholds by the specified percentage") \ 3389 range(0, max_jint) \ 3390 \ 3391 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3392 "Increase the compile threshold for C1 compilation if the code " \ 3393 "cache is filled by the specified percentage") \ 3394 range(0, 99) \ 3395 \ 3396 product(intx, TieredRateUpdateMinTime, 1, \ 3397 "Minimum rate sampling interval (in milliseconds)") \ 3398 range(0, max_intx) \ 3399 \ 3400 product(intx, TieredRateUpdateMaxTime, 25, \ 3401 "Maximum rate sampling interval (in milliseconds)") \ 3402 range(0, max_intx) \ 3403 \ 3404 product_pd(bool, TieredCompilation, \ 3405 "Enable tiered compilation") \ 3406 \ 3407 product(bool, PrintTieredEvents, false, \ 3408 "Print tiered events notifications") \ 3409 \ 3410 product_pd(intx, OnStackReplacePercentage, \ 3411 "NON_TIERED number of method invocations/branches (expressed as " \ 3412 "% of CompileThreshold) before (re-)compiling OSR code") \ 3413 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3414 \ 3415 product(intx, InterpreterProfilePercentage, 33, \ 3416 "NON_TIERED number of method invocations/branches (expressed as " \ 3417 "% of CompileThreshold) before profiling in the interpreter") \ 3418 range(0, 100) \ 3419 \ 3420 develop(intx, MaxRecompilationSearchLength, 10, \ 3421 "The maximum number of frames to inspect when searching for " \ 3422 "recompilee") \ 3423 \ 3424 develop(intx, MaxInterpretedSearchLength, 3, \ 3425 "The maximum number of interpreted frames to skip when searching "\ 3426 "for recompilee") \ 3427 \ 3428 develop(intx, DesiredMethodLimit, 8000, \ 3429 "The desired maximum method size (in bytecodes) after inlining") \ 3430 \ 3431 develop(intx, HugeMethodLimit, 8000, \ 3432 "Don't compile methods larger than this if " \ 3433 "+DontCompileHugeMethods") \ 3434 \ 3435 /* New JDK 1.4 reflection implementation */ \ 3436 \ 3437 develop(intx, FastSuperclassLimit, 8, \ 3438 "Depth of hardwired instanceof accelerator array") \ 3439 \ 3440 /* Properties for Java libraries */ \ 3441 \ 3442 product(uint64_t, MaxDirectMemorySize, 0, \ 3443 "Maximum total size of NIO direct-buffer allocations") \ 3444 range(0, max_jlong) \ 3445 \ 3446 /* Flags used for temporary code during development */ \ 3447 \ 3448 diagnostic(bool, UseNewCode, false, \ 3449 "Testing Only: Use the new version while testing") \ 3450 \ 3451 diagnostic(bool, UseNewCode2, false, \ 3452 "Testing Only: Use the new version while testing") \ 3453 \ 3454 diagnostic(bool, UseNewCode3, false, \ 3455 "Testing Only: Use the new version while testing") \ 3456 \ 3457 /* flags for performance data collection */ \ 3458 \ 3459 product(bool, UsePerfData, true, \ 3460 "Flag to disable jvmstat instrumentation for performance testing "\ 3461 "and problem isolation purposes") \ 3462 \ 3463 product(bool, PerfDataSaveToFile, false, \ 3464 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3465 \ 3466 product(ccstr, PerfDataSaveFile, NULL, \ 3467 "Save PerfData memory to the specified absolute pathname. " \ 3468 "The string %p in the file name (if present) " \ 3469 "will be replaced by pid") \ 3470 \ 3471 product(intx, PerfDataSamplingInterval, 50, \ 3472 "Data sampling interval (in milliseconds)") \ 3473 range(PeriodicTask::min_interval, max_jint) \ 3474 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3475 \ 3476 product(bool, PerfDisableSharedMem, false, \ 3477 "Store performance data in standard memory") \ 3478 \ 3479 product(intx, PerfDataMemorySize, 32*K, \ 3480 "Size of performance data memory region. Will be rounded " \ 3481 "up to a multiple of the native os page size.") \ 3482 range(128, 32*64*K) \ 3483 \ 3484 product(intx, PerfMaxStringConstLength, 1024, \ 3485 "Maximum PerfStringConstant string length before truncation") \ 3486 range(32, 32*K) \ 3487 \ 3488 product(bool, PerfAllowAtExitRegistration, false, \ 3489 "Allow registration of atexit() methods") \ 3490 \ 3491 product(bool, PerfBypassFileSystemCheck, false, \ 3492 "Bypass Win32 file system criteria checks (Windows Only)") \ 3493 \ 3494 product(intx, UnguardOnExecutionViolation, 0, \ 3495 "Unguard page and retry on no-execute fault (Win32 only) " \ 3496 "0=off, 1=conservative, 2=aggressive") \ 3497 range(0, 2) \ 3498 \ 3499 /* Serviceability Support */ \ 3500 \ 3501 product(bool, ManagementServer, false, \ 3502 "Create JMX Management Server") \ 3503 \ 3504 product(bool, DisableAttachMechanism, false, \ 3505 "Disable mechanism that allows tools to attach to this VM") \ 3506 \ 3507 product(bool, StartAttachListener, false, \ 3508 "Always start Attach Listener at VM startup") \ 3509 \ 3510 product(bool, EnableDynamicAgentLoading, true, \ 3511 "Allow tools to load agents with the attach mechanism") \ 3512 \ 3513 manageable(bool, PrintConcurrentLocks, false, \ 3514 "Print java.util.concurrent locks in thread dump") \ 3515 \ 3516 product(bool, TransmitErrorReport, false, \ 3517 "Enable error report transmission on erroneous termination") \ 3518 \ 3519 product(ccstr, ErrorReportServer, NULL, \ 3520 "Override built-in error report server address") \ 3521 \ 3522 /* Shared spaces */ \ 3523 \ 3524 product(bool, UseSharedSpaces, true, \ 3525 "Use shared spaces for metadata") \ 3526 \ 3527 product(bool, VerifySharedSpaces, false, \ 3528 "Verify shared spaces (false for default archive, true for " \ 3529 "archive specified by -XX:SharedArchiveFile)") \ 3530 \ 3531 product(bool, RequireSharedSpaces, false, \ 3532 "Require shared spaces for metadata") \ 3533 \ 3534 product(bool, DumpSharedSpaces, false, \ 3535 "Special mode: JVM reads a class list, loads classes, builds " \ 3536 "shared spaces, and dumps the shared spaces to a file to be " \ 3537 "used in future JVM runs") \ 3538 \ 3539 product(bool, PrintSharedArchiveAndExit, false, \ 3540 "Print shared archive file contents") \ 3541 \ 3542 product(bool, PrintSharedDictionary, false, \ 3543 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3544 "dictionary") \ 3545 \ 3546 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3547 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3548 "Address to allocate shared memory region for class data") \ 3549 range(0, SIZE_MAX) \ 3550 \ 3551 product(bool, UseAppCDS, false, \ 3552 "Enable Application Class Data Sharing when using shared spaces") \ 3553 writeable(CommandLineOnly) \ 3554 \ 3555 product(ccstr, SharedArchiveConfigFile, NULL, \ 3556 "Data to add to the CDS archive file") \ 3557 \ 3558 product(uintx, SharedSymbolTableBucketSize, 4, \ 3559 "Average number of symbols per bucket in shared table") \ 3560 range(2, 246) \ 3561 \ 3562 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \ 3563 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3564 "classes. Just exclude them from the shared dictionary.") \ 3565 \ 3566 diagnostic(bool, PrintMethodHandleStubs, false, \ 3567 "Print generated stub code for method handles") \ 3568 \ 3569 develop(bool, TraceMethodHandles, false, \ 3570 "trace internal method handle operations") \ 3571 \ 3572 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3573 "perform extra checks when constructing method handles") \ 3574 \ 3575 diagnostic(bool, ShowHiddenFrames, false, \ 3576 "show method handle implementation frames (usually hidden)") \ 3577 \ 3578 experimental(bool, TrustFinalNonStaticFields, false, \ 3579 "trust final non-static declarations for constant folding") \ 3580 \ 3581 diagnostic(bool, FoldStableValues, true, \ 3582 "Optimize loads from stable fields (marked w/ @Stable)") \ 3583 \ 3584 develop(bool, TraceInvokeDynamic, false, \ 3585 "trace internal invoke dynamic operations") \ 3586 \ 3587 diagnostic(int, UseBootstrapCallInfo, 1, \ 3588 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 3589 "resolved before the bootstrap method is called; 1: when a BSM " \ 3590 "that may accept a BootstrapCallInfo is detected, use that API " \ 3591 "to pass BSM arguments, which allows the BSM to delay their " \ 3592 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 3593 "via that API, instead of with the eagerly-resolved array.") \ 3594 \ 3595 diagnostic(bool, PauseAtStartup, false, \ 3596 "Causes the VM to pause at startup time and wait for the pause " \ 3597 "file to be removed (default: ./vm.paused.<pid>)") \ 3598 \ 3599 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3600 "The file to create and for whose removal to await when pausing " \ 3601 "at startup. (default: ./vm.paused.<pid>)") \ 3602 \ 3603 diagnostic(bool, PauseAtExit, false, \ 3604 "Pause and wait for keypress on exit if a debugger is attached") \ 3605 \ 3606 product(bool, ExtendedDTraceProbes, false, \ 3607 "Enable performance-impacting dtrace probes") \ 3608 \ 3609 product(bool, DTraceMethodProbes, false, \ 3610 "Enable dtrace probes for method-entry and method-exit") \ 3611 \ 3612 product(bool, DTraceAllocProbes, false, \ 3613 "Enable dtrace probes for object allocation") \ 3614 \ 3615 product(bool, DTraceMonitorProbes, false, \ 3616 "Enable dtrace probes for monitor events") \ 3617 \ 3618 product(bool, RelaxAccessControlCheck, false, \ 3619 "Relax the access control checks in the verifier") \ 3620 \ 3621 product(uintx, StringTableSize, defaultStringTableSize, \ 3622 "Number of buckets in the interned String table") \ 3623 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3624 \ 3625 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3626 "Number of buckets in the JVM internal Symbol table") \ 3627 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3628 \ 3629 product(bool, UseStringDeduplication, false, \ 3630 "Use string deduplication") \ 3631 \ 3632 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3633 "A string must reach this age (or be promoted to an old region) " \ 3634 "to be considered for deduplication") \ 3635 range(1, markOopDesc::max_age) \ 3636 \ 3637 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3638 "Force table resize every time the table is scanned") \ 3639 \ 3640 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3641 "Force table rehash every time the table is scanned") \ 3642 \ 3643 diagnostic(bool, WhiteBoxAPI, false, \ 3644 "Enable internal testing APIs") \ 3645 \ 3646 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3647 "Default survivor space alignment in bytes") \ 3648 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 3649 \ 3650 product(bool , AllowNonVirtualCalls, false, \ 3651 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3652 \ 3653 product(ccstr, DumpLoadedClassList, NULL, \ 3654 "Dump the names all loaded classes, that could be stored into " \ 3655 "the CDS archive, in the specified file") \ 3656 \ 3657 product(ccstr, SharedClassListFile, NULL, \ 3658 "Override the default CDS class list") \ 3659 \ 3660 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3661 "Override the default location of the CDS archive file") \ 3662 \ 3663 product(ccstr, ExtraSharedClassListFile, NULL, \ 3664 "Extra classlist for building the CDS archive file") \ 3665 \ 3666 experimental(size_t, ArrayAllocatorMallocLimit, \ 3667 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 3668 "Allocation less than this value will be allocated " \ 3669 "using malloc. Larger allocations will use mmap.") \ 3670 \ 3671 experimental(bool, AlwaysAtomicAccesses, false, \ 3672 "Accesses to all variables should always be atomic") \ 3673 \ 3674 product(bool, EnableTracing, false, \ 3675 "Enable event-based tracing") \ 3676 \ 3677 product(bool, UseLockedTracing, false, \ 3678 "Use locked-tracing when doing event-based tracing") \ 3679 \ 3680 diagnostic(bool, UseUnalignedAccesses, false, \ 3681 "Use unaligned memory accesses in Unsafe") \ 3682 \ 3683 product_pd(bool, PreserveFramePointer, \ 3684 "Use the FP register for holding the frame pointer " \ 3685 "and not as a general purpose register.") \ 3686 \ 3687 diagnostic(bool, CheckIntrinsics, true, \ 3688 "When a class C is loaded, check that " \ 3689 "(1) all intrinsics defined by the VM for class C are present "\ 3690 "in the loaded class file and are marked with the " \ 3691 "@HotSpotIntrinsicCandidate annotation, that " \ 3692 "(2) there is an intrinsic registered for all loaded methods " \ 3693 "that are annotated with the @HotSpotIntrinsicCandidate " \ 3694 "annotation, and that " \ 3695 "(3) no orphan methods exist for class C (i.e., methods for " \ 3696 "which the VM declares an intrinsic but that are not declared "\ 3697 "in the loaded class C. " \ 3698 "Check (3) is available only in debug builds.") \ 3699 \ 3700 diagnostic_pd(intx, InitArrayShortSize, \ 3701 "Threshold small size (in bytes) for clearing arrays. " \ 3702 "Anything this size or smaller may get converted to discrete " \ 3703 "scalar stores.") \ 3704 range(0, max_intx) \ 3705 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 3706 \ 3707 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 3708 "Disable backwards compatibility for compile commands.") \ 3709 \ 3710 diagnostic(bool, CompilerDirectivesPrint, false, \ 3711 "Print compiler directives on installation.") \ 3712 diagnostic(int, CompilerDirectivesLimit, 50, \ 3713 "Limit on number of compiler directives.") \ 3714 \ 3715 product(ccstr, AllocateHeapAt, NULL, \ 3716 "Path to the directoy where a temporary file will be created " \ 3717 "to use as the backing store for Java Heap.") \ 3718 \ 3719 develop(bool, VerifyMetaspace, false, \ 3720 "Verify metaspace on chunk movements.") \ 3721 \ 3722 diagnostic(bool, ShowRegistersOnAssert, false, \ 3723 "On internal errors, include registers in error report.") \ 3724 \ 3725 3726 3727 3728 /* 3729 * Macros for factoring of globals 3730 */ 3731 3732 // Interface macros 3733 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3734 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3735 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3736 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 3737 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3738 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3739 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3740 #ifdef PRODUCT 3741 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3742 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3743 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 3744 #else 3745 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3746 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3747 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3748 #endif // PRODUCT 3749 // Special LP64 flags, product only needed for now. 3750 #ifdef _LP64 3751 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3752 #else 3753 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3754 #endif // _LP64 3755 3756 // Implementation macros 3757 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3758 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3759 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3760 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 3761 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3762 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3763 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3764 #ifdef PRODUCT 3765 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 3766 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 3767 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3768 #else 3769 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3770 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3771 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3772 #endif // PRODUCT 3773 #ifdef _LP64 3774 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3775 #else 3776 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3777 #endif // _LP64 3778 3779 // Only materialize src code for range checking when required, ignore otherwise 3780 #define IGNORE_RANGE(a, b) 3781 // Only materialize src code for contraint checking when required, ignore otherwise 3782 #define IGNORE_CONSTRAINT(func,type) 3783 3784 #define IGNORE_WRITEABLE(type) 3785 3786 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 3787 DECLARE_PD_DEVELOPER_FLAG, \ 3788 DECLARE_PRODUCT_FLAG, \ 3789 DECLARE_PD_PRODUCT_FLAG, \ 3790 DECLARE_DIAGNOSTIC_FLAG, \ 3791 DECLARE_PD_DIAGNOSTIC_FLAG, \ 3792 DECLARE_EXPERIMENTAL_FLAG, \ 3793 DECLARE_NOTPRODUCT_FLAG, \ 3794 DECLARE_MANAGEABLE_FLAG, \ 3795 DECLARE_PRODUCT_RW_FLAG, \ 3796 DECLARE_LP64_PRODUCT_FLAG, \ 3797 IGNORE_RANGE, \ 3798 IGNORE_CONSTRAINT, \ 3799 IGNORE_WRITEABLE) 3800 3801 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 3802 DECLARE_PD_DEVELOPER_FLAG, \ 3803 DECLARE_PRODUCT_FLAG, \ 3804 DECLARE_PD_PRODUCT_FLAG, \ 3805 DECLARE_DIAGNOSTIC_FLAG, \ 3806 DECLARE_PD_DIAGNOSTIC_FLAG, \ 3807 DECLARE_NOTPRODUCT_FLAG, \ 3808 IGNORE_RANGE, \ 3809 IGNORE_CONSTRAINT, \ 3810 IGNORE_WRITEABLE) 3811 3812 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 3813 DECLARE_PRODUCT_FLAG, \ 3814 DECLARE_DIAGNOSTIC_FLAG, \ 3815 DECLARE_EXPERIMENTAL_FLAG, \ 3816 DECLARE_NOTPRODUCT_FLAG, \ 3817 IGNORE_RANGE, \ 3818 IGNORE_CONSTRAINT, \ 3819 IGNORE_WRITEABLE) 3820 3821 // Extensions 3822 3823 #include "runtime/globals_ext.hpp" 3824 3825 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP