1 /* 2 * Copyright (c) 1997, 2019, 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_RUNTIME_GLOBALS_HPP 26 #define SHARE_RUNTIME_GLOBALS_HPP 27 28 #include "compiler/compiler_globals.hpp" 29 #include "gc/shared/gc_globals.hpp" 30 #include "runtime/globals_shared.hpp" 31 #include "utilities/align.hpp" 32 #include "utilities/globalDefinitions.hpp" 33 #include "utilities/macros.hpp" 34 #include CPU_HEADER(globals) 35 #include OS_HEADER(globals) 36 #include OS_CPU_HEADER(globals) 37 38 // develop flags are settable / visible only during development and are constant in the PRODUCT version 39 // product flags are always settable / visible 40 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 41 42 // A flag must be declared with one of the following types: 43 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t. 44 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used 45 // only in this file, because the macrology requires single-token type names. 46 47 // Note: Diagnostic options not meant for VM tuning or for product modes. 48 // They are to be used for VM quality assurance or field diagnosis 49 // of VM bugs. They are hidden so that users will not be encouraged to 50 // try them as if they were VM ordinary execution options. However, they 51 // are available in the product version of the VM. Under instruction 52 // from support engineers, VM customers can turn them on to collect 53 // diagnostic information about VM problems. To use a VM diagnostic 54 // option, you must first specify +UnlockDiagnosticVMOptions. 55 // (This master switch also affects the behavior of -Xprintflags.) 56 // 57 // experimental flags are in support of features that are not 58 // part of the officially supported product, but are available 59 // for experimenting with. They could, for example, be performance 60 // features that may not have undergone full or rigorous QA, but which may 61 // help performance in some cases and released for experimentation 62 // by the community of users and developers. This flag also allows one to 63 // be able to build a fully supported product that nonetheless also 64 // ships with some unsupported, lightly tested, experimental features. 65 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 66 // UnlockExperimentalVMOptions flag, which allows the control and 67 // modification of the experimental flags. 68 // 69 // Nota bene: neither diagnostic nor experimental options should be used casually, 70 // and they are not supported on production loads, except under explicit 71 // direction from support engineers. 72 // 73 // manageable flags are writeable external product flags. 74 // They are dynamically writeable through the JDK management interface 75 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 76 // These flags are external exported interface (see CCC). The list of 77 // manageable flags can be queried programmatically through the management 78 // interface. 79 // 80 // A flag can be made as "manageable" only if 81 // - the flag is defined in a CCC as an external exported interface. 82 // - the VM implementation supports dynamic setting of the flag. 83 // This implies that the VM must *always* query the flag variable 84 // and not reuse state related to the flag state at any given time. 85 // - you want the flag to be queried programmatically by the customers. 86 // 87 // product_rw flags are writeable internal product flags. 88 // They are like "manageable" flags but for internal/private use. 89 // The list of product_rw flags are internal/private flags which 90 // may be changed/removed in a future release. It can be set 91 // through the management interface to get/set value 92 // when the name of flag is supplied. 93 // 94 // A flag can be made as "product_rw" only if 95 // - the VM implementation supports dynamic setting of the flag. 96 // This implies that the VM must *always* query the flag variable 97 // and not reuse state related to the flag state at any given time. 98 // 99 // Note that when there is a need to support develop flags to be writeable, 100 // it can be done in the same way as product_rw. 101 // 102 // range is a macro that will expand to min and max arguments for range 103 // checking code if provided - see jvmFlagRangeList.hpp 104 // 105 // constraint is a macro that will expand to custom function call 106 // for constraint checking if provided - see jvmFlagConstraintList.hpp 107 // 108 // writeable is a macro that controls if and how the value can change during the runtime 109 // 110 // writeable(Always) is optional and allows the flag to have its value changed 111 // without any limitations at any time 112 // 113 // writeable(Once) flag value's can be only set once during the lifetime of VM 114 // 115 // writeable(CommandLineOnly) flag value's can be only set from command line 116 // (multiple times allowed) 117 // 118 119 // Default and minimum StringTable and SymbolTable size values 120 // Must be powers of 2 121 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 122 const size_t minimumStringTableSize = 128; 123 const size_t defaultSymbolTableSize = 32768; // 2^15 124 const size_t minimumSymbolTableSize = 1024; 125 126 #define RUNTIME_FLAGS(develop, \ 127 develop_pd, \ 128 product, \ 129 product_pd, \ 130 diagnostic, \ 131 diagnostic_pd, \ 132 experimental, \ 133 notproduct, \ 134 manageable, \ 135 product_rw, \ 136 lp64_product, \ 137 range, \ 138 constraint, \ 139 writeable) \ 140 \ 141 lp64_product(bool, UseCompressedOops, false, \ 142 "Use 32-bit object references in 64-bit VM. " \ 143 "lp64_product means flag is always constant in 32 bit VM") \ 144 \ 145 lp64_product(bool, UseCompressedClassPointers, false, \ 146 "Use 32-bit class pointers in 64-bit VM. " \ 147 "lp64_product means flag is always constant in 32 bit VM") \ 148 \ 149 notproduct(bool, CheckCompressedOops, true, \ 150 "Generate checks in encoding/decoding code in debug VM") \ 151 \ 152 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 153 "Heap allocation steps through preferred address regions to find" \ 154 " where it can allocate the heap. Number of steps to take per " \ 155 "region.") \ 156 range(1, max_uintx) \ 157 \ 158 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 159 "Default object alignment in bytes, 8 is minimum") \ 160 range(8, 256) \ 161 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 162 \ 163 develop(bool, CleanChunkPoolAsync, true, \ 164 "Clean the chunk pool asynchronously") \ 165 \ 166 product_pd(bool, ThreadLocalHandshakes, \ 167 "Use thread-local polls instead of global poll for safepoints.") \ 168 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 169 \ 170 diagnostic(uint, HandshakeTimeout, 0, \ 171 "If nonzero set a timeout in milliseconds for handshakes") \ 172 \ 173 experimental(bool, AlwaysSafeConstructors, false, \ 174 "Force safe construction, as if all fields are final.") \ 175 \ 176 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 177 "Enable normal processing of flags relating to field diagnostics")\ 178 \ 179 experimental(bool, UnlockExperimentalVMOptions, false, \ 180 "Enable normal processing of flags relating to experimental " \ 181 "features") \ 182 \ 183 product(bool, JavaMonitorsInStackTrace, true, \ 184 "Print information about Java monitor locks when the stacks are" \ 185 "dumped") \ 186 \ 187 product_pd(bool, UseLargePages, \ 188 "Use large page memory") \ 189 \ 190 product_pd(bool, UseLargePagesIndividualAllocation, \ 191 "Allocate large pages individually for better affinity") \ 192 \ 193 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 194 "Fail large pages individual allocation") \ 195 \ 196 product(bool, UseLargePagesInMetaspace, false, \ 197 "Use large page memory in metaspace. " \ 198 "Only used if UseLargePages is enabled.") \ 199 \ 200 product(bool, UseNUMA, false, \ 201 "Use NUMA if available") \ 202 \ 203 product(bool, UseNUMAInterleaving, false, \ 204 "Interleave memory across NUMA nodes if available") \ 205 \ 206 product(size_t, NUMAInterleaveGranularity, 2*M, \ 207 "Granularity to use for NUMA interleaving on Windows OS") \ 208 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 209 \ 210 product(bool, ForceNUMA, false, \ 211 "Force NUMA optimizations on single-node/UMA systems") \ 212 \ 213 product(uintx, NUMAChunkResizeWeight, 20, \ 214 "Percentage (0-100) used to weight the current sample when " \ 215 "computing exponentially decaying average for " \ 216 "AdaptiveNUMAChunkSizing") \ 217 range(0, 100) \ 218 \ 219 product(size_t, NUMASpaceResizeRate, 1*G, \ 220 "Do not reallocate more than this amount per collection") \ 221 range(0, max_uintx) \ 222 \ 223 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 224 "Enable adaptive chunk sizing for NUMA") \ 225 \ 226 product(bool, NUMAStats, false, \ 227 "Print NUMA stats in detailed heap information") \ 228 \ 229 product(uintx, NUMAPageScanRate, 256, \ 230 "Maximum number of pages to include in the page scan procedure") \ 231 range(0, max_uintx) \ 232 \ 233 product(intx, UseSSE, 99, \ 234 "Highest supported SSE instructions set on x86/x64") \ 235 range(0, 99) \ 236 \ 237 product(bool, UseAES, false, \ 238 "Control whether AES instructions are used when available") \ 239 \ 240 product(bool, UseFMA, false, \ 241 "Control whether FMA instructions are used when available") \ 242 \ 243 product(bool, UseSHA, false, \ 244 "Control whether SHA instructions are used when available") \ 245 \ 246 diagnostic(bool, UseGHASHIntrinsics, false, \ 247 "Use intrinsics for GHASH versions of crypto") \ 248 \ 249 product(bool, UseBASE64Intrinsics, false, \ 250 "Use intrinsics for java.util.Base64") \ 251 \ 252 product(size_t, LargePageSizeInBytes, 0, \ 253 "Large page size (0 to let VM choose the page size)") \ 254 range(0, max_uintx) \ 255 \ 256 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 257 "Use large pages if maximum heap is at least this big") \ 258 range(0, max_uintx) \ 259 \ 260 product(bool, ForceTimeHighResolution, false, \ 261 "Using high time resolution (for Win32 only)") \ 262 \ 263 develop(bool, TracePcPatching, false, \ 264 "Trace usage of frame::patch_pc") \ 265 \ 266 develop(bool, TraceRelocator, false, \ 267 "Trace the bytecode relocator") \ 268 \ 269 develop(bool, TraceLongCompiles, false, \ 270 "Print out every time compilation is longer than " \ 271 "a given threshold") \ 272 \ 273 diagnostic(bool, SafepointALot, false, \ 274 "Generate a lot of safepoints. This works with " \ 275 "GuaranteedSafepointInterval") \ 276 \ 277 diagnostic(bool, HandshakeALot, false, \ 278 "Generate a lot of handshakes. This works with " \ 279 "GuaranteedSafepointInterval") \ 280 \ 281 product_pd(bool, BackgroundCompilation, \ 282 "A thread requesting compilation is not blocked during " \ 283 "compilation") \ 284 \ 285 product(bool, PrintVMQWaitTime, false, \ 286 "Print out the waiting time in VM operation queue") \ 287 \ 288 product(bool, MethodFlushing, true, \ 289 "Reclamation of zombie and not-entrant methods") \ 290 \ 291 develop(bool, VerifyStack, false, \ 292 "Verify stack of each thread when it is entering a runtime call") \ 293 \ 294 diagnostic(bool, ForceUnreachable, false, \ 295 "Make all non code cache addresses to be unreachable by " \ 296 "forcing use of 64bit literal fixups") \ 297 \ 298 notproduct(bool, StressDerivedPointers, false, \ 299 "Force scavenge when a derived pointer is detected on stack " \ 300 "after rtm call") \ 301 \ 302 develop(bool, TraceDerivedPointers, false, \ 303 "Trace traversal of derived pointers on stack") \ 304 \ 305 notproduct(bool, TraceCodeBlobStacks, false, \ 306 "Trace stack-walk of codeblobs") \ 307 \ 308 product(bool, PrintJNIResolving, false, \ 309 "Used to implement -v:jni") \ 310 \ 311 notproduct(bool, PrintRewrites, false, \ 312 "Print methods that are being rewritten") \ 313 \ 314 product(bool, UseInlineCaches, true, \ 315 "Use Inline Caches for virtual calls ") \ 316 \ 317 diagnostic(bool, InlineArrayCopy, true, \ 318 "Inline arraycopy native that is known to be part of " \ 319 "base library DLL") \ 320 \ 321 diagnostic(bool, InlineObjectHash, true, \ 322 "Inline Object::hashCode() native that is known to be part " \ 323 "of base library DLL") \ 324 \ 325 diagnostic(bool, InlineNatives, true, \ 326 "Inline natives that are known to be part of base library DLL") \ 327 \ 328 diagnostic(bool, InlineMathNatives, true, \ 329 "Inline SinD, CosD, etc.") \ 330 \ 331 diagnostic(bool, InlineClassNatives, true, \ 332 "Inline Class.isInstance, etc") \ 333 \ 334 diagnostic(bool, InlineThreadNatives, true, \ 335 "Inline Thread.currentThread, etc") \ 336 \ 337 diagnostic(bool, InlineUnsafeOps, true, \ 338 "Inline memory ops (native methods) from Unsafe") \ 339 \ 340 product(bool, CriticalJNINatives, true, \ 341 "Check for critical JNI entry points") \ 342 \ 343 notproduct(bool, StressCriticalJNINatives, false, \ 344 "Exercise register saving code in critical natives") \ 345 \ 346 diagnostic(bool, UseAESIntrinsics, false, \ 347 "Use intrinsics for AES versions of crypto") \ 348 \ 349 diagnostic(bool, UseAESCTRIntrinsics, false, \ 350 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 351 \ 352 diagnostic(bool, UseSHA1Intrinsics, false, \ 353 "Use intrinsics for SHA-1 crypto hash function. " \ 354 "Requires that UseSHA is enabled.") \ 355 \ 356 diagnostic(bool, UseSHA256Intrinsics, false, \ 357 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 358 "Requires that UseSHA is enabled.") \ 359 \ 360 diagnostic(bool, UseSHA512Intrinsics, false, \ 361 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 362 "Requires that UseSHA is enabled.") \ 363 \ 364 diagnostic(bool, UseCRC32Intrinsics, false, \ 365 "use intrinsics for java.util.zip.CRC32") \ 366 \ 367 diagnostic(bool, UseCRC32CIntrinsics, false, \ 368 "use intrinsics for java.util.zip.CRC32C") \ 369 \ 370 diagnostic(bool, UseAdler32Intrinsics, false, \ 371 "use intrinsics for java.util.zip.Adler32") \ 372 \ 373 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 374 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 375 \ 376 diagnostic(ccstrlist, DisableIntrinsic, "", \ 377 "do not expand intrinsics whose (internal) names appear here") \ 378 \ 379 develop(bool, TraceCallFixup, false, \ 380 "Trace all call fixups") \ 381 \ 382 develop(bool, DeoptimizeALot, false, \ 383 "Deoptimize at every exit from the runtime system") \ 384 \ 385 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 386 "A comma separated list of bcis to deoptimize at") \ 387 \ 388 product(bool, DeoptimizeRandom, false, \ 389 "Deoptimize random frames on random exit from the runtime system")\ 390 \ 391 notproduct(bool, ZombieALot, false, \ 392 "Create zombies (non-entrant) at exit from the runtime system") \ 393 \ 394 notproduct(bool, WalkStackALot, false, \ 395 "Trace stack (no print) at every exit from the runtime system") \ 396 \ 397 product(bool, Debugging, false, \ 398 "Set when executing debug methods in debug.cpp " \ 399 "(to prevent triggering assertions)") \ 400 \ 401 notproduct(bool, VerifyLastFrame, false, \ 402 "Verify oops on last frame on entry to VM") \ 403 \ 404 product(bool, SafepointTimeout, false, \ 405 "Time out and warn or fail after SafepointTimeoutDelay " \ 406 "milliseconds if failed to reach safepoint") \ 407 \ 408 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 409 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 410 \ 411 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 412 "Abort upon failure to complete VM operation promptly") \ 413 \ 414 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 415 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 416 range(0, max_intx) \ 417 \ 418 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 419 /* typically, at most a few retries are needed */ \ 420 product(intx, SuspendRetryCount, 50, \ 421 "Maximum retry count for an external suspend request") \ 422 range(0, max_intx) \ 423 \ 424 product(intx, SuspendRetryDelay, 5, \ 425 "Milliseconds to delay per retry (* current_retry_count)") \ 426 range(0, max_intx) \ 427 \ 428 product(bool, AssertOnSuspendWaitFailure, false, \ 429 "Assert/Guarantee on external suspend wait failure") \ 430 \ 431 product(bool, TraceSuspendWaitFailures, false, \ 432 "Trace external suspend wait failures") \ 433 \ 434 product(bool, MaxFDLimit, true, \ 435 "Bump the number of file descriptors to maximum in Solaris") \ 436 \ 437 diagnostic(bool, LogEvents, true, \ 438 "Enable the various ring buffer event logs") \ 439 \ 440 diagnostic(uintx, LogEventsBufferEntries, 20, \ 441 "Number of ring buffer event logs") \ 442 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 443 \ 444 diagnostic(bool, BytecodeVerificationRemote, true, \ 445 "Enable the Java bytecode verifier for remote classes") \ 446 \ 447 diagnostic(bool, BytecodeVerificationLocal, false, \ 448 "Enable the Java bytecode verifier for local classes") \ 449 \ 450 develop(bool, ForceFloatExceptions, trueInDebug, \ 451 "Force exceptions on FP stack under/overflow") \ 452 \ 453 develop(bool, VerifyStackAtCalls, false, \ 454 "Verify that the stack pointer is unchanged after calls") \ 455 \ 456 develop(bool, TraceJavaAssertions, false, \ 457 "Trace java language assertions") \ 458 \ 459 notproduct(bool, VerifyCodeCache, false, \ 460 "Verify code cache on memory allocation/deallocation") \ 461 \ 462 develop(bool, UseMallocOnly, false, \ 463 "Use only malloc/free for allocation (no resource area/arena)") \ 464 \ 465 develop(bool, ZapResourceArea, trueInDebug, \ 466 "Zap freed resource/arena space with 0xABABABAB") \ 467 \ 468 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 469 "Zap freed VM handle space with 0xBCBCBCBC") \ 470 \ 471 notproduct(bool, ZapStackSegments, trueInDebug, \ 472 "Zap allocated/freed stack segments with 0xFADFADED") \ 473 \ 474 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 475 "Zap unused heap space with 0xBAADBABE") \ 476 \ 477 develop(bool, CheckZapUnusedHeapArea, false, \ 478 "Check zapping of unused heap space") \ 479 \ 480 develop(bool, ZapFillerObjects, trueInDebug, \ 481 "Zap filler objects with 0xDEAFBABE") \ 482 \ 483 develop(bool, PrintVMMessages, true, \ 484 "Print VM messages on console") \ 485 \ 486 notproduct(uintx, ErrorHandlerTest, 0, \ 487 "If > 0, provokes an error after VM initialization; the value " \ 488 "determines which error to provoke. See test_error_handler() " \ 489 "in vmError.cpp.") \ 490 \ 491 notproduct(uintx, TestCrashInErrorHandler, 0, \ 492 "If > 0, provokes an error inside VM error handler (a secondary " \ 493 "crash). see test_error_handler() in vmError.cpp") \ 494 \ 495 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 496 "If true, tests SafeFetch inside error handler.") \ 497 \ 498 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 499 "If true, simulates an unresponsive error handler.") \ 500 \ 501 develop(bool, Verbose, false, \ 502 "Print additional debugging information from other modes") \ 503 \ 504 develop(bool, PrintMiscellaneous, false, \ 505 "Print uncategorized debugging information (requires +Verbose)") \ 506 \ 507 develop(bool, WizardMode, false, \ 508 "Print much more debugging information") \ 509 \ 510 product(bool, ShowMessageBoxOnError, false, \ 511 "Keep process alive on VM fatal error") \ 512 \ 513 product(bool, CreateCoredumpOnCrash, true, \ 514 "Create core/mini dump on VM fatal error") \ 515 \ 516 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 517 "Timeout, in seconds, to limit the time spent on writing an " \ 518 "error log in case of a crash.") \ 519 range(0, (uint64_t)max_jlong/1000) \ 520 \ 521 product_pd(bool, UseOSErrorReporting, \ 522 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 523 \ 524 product(bool, SuppressFatalErrorMessage, false, \ 525 "Report NO fatal error message (avoid deadlock)") \ 526 \ 527 product(ccstrlist, OnError, "", \ 528 "Run user-defined commands on fatal error; see VMError.cpp " \ 529 "for examples") \ 530 \ 531 product(ccstrlist, OnOutOfMemoryError, "", \ 532 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 533 \ 534 manageable(bool, HeapDumpBeforeFullGC, false, \ 535 "Dump heap to file before any major stop-the-world GC") \ 536 \ 537 manageable(bool, HeapDumpAfterFullGC, false, \ 538 "Dump heap to file after any major stop-the-world GC") \ 539 \ 540 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 541 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 542 \ 543 manageable(ccstr, HeapDumpPath, NULL, \ 544 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 545 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 546 "in the working directory)") \ 547 \ 548 develop(bool, BreakAtWarning, false, \ 549 "Execute breakpoint upon encountering VM warning") \ 550 \ 551 product(ccstr, NativeMemoryTracking, "off", \ 552 "Native memory tracking options") \ 553 \ 554 diagnostic(bool, PrintNMTStatistics, false, \ 555 "Print native memory tracking summary data if it is on") \ 556 \ 557 diagnostic(bool, LogCompilation, false, \ 558 "Log compilation activity in detail to LogFile") \ 559 \ 560 product(bool, PrintCompilation, false, \ 561 "Print compilations") \ 562 \ 563 product(bool, PrintExtendedThreadInfo, false, \ 564 "Print more information in thread dump") \ 565 \ 566 diagnostic(bool, TraceNMethodInstalls, false, \ 567 "Trace nmethod installation") \ 568 \ 569 diagnostic(intx, ScavengeRootsInCode, 2, \ 570 "0: do not allow scavengable oops in the code cache; " \ 571 "1: allow scavenging from the code cache; " \ 572 "2: emit as many constants as the compiler can see") \ 573 range(0, 2) \ 574 \ 575 product(bool, AlwaysRestoreFPU, false, \ 576 "Restore the FPU control word after every JNI call (expensive)") \ 577 \ 578 diagnostic(bool, PrintCompilation2, false, \ 579 "Print additional statistics per compilation") \ 580 \ 581 diagnostic(bool, PrintAdapterHandlers, false, \ 582 "Print code generated for i2c/c2i adapters") \ 583 \ 584 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 585 "Verify that i2c/c2i adapters are called properly") \ 586 \ 587 develop(bool, VerifyAdapterSharing, false, \ 588 "Verify that the code for shared adapters is the equivalent") \ 589 \ 590 diagnostic(bool, PrintAssembly, false, \ 591 "Print assembly code (using external disassembler.so)") \ 592 \ 593 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 594 "Print options string passed to disassembler.so") \ 595 \ 596 notproduct(bool, PrintNMethodStatistics, false, \ 597 "Print a summary statistic for the generated nmethods") \ 598 \ 599 diagnostic(bool, PrintNMethods, false, \ 600 "Print assembly code for nmethods when generated") \ 601 \ 602 diagnostic(bool, PrintNativeNMethods, false, \ 603 "Print assembly code for native nmethods when generated") \ 604 \ 605 develop(bool, PrintDebugInfo, false, \ 606 "Print debug information for all nmethods when generated") \ 607 \ 608 develop(bool, PrintRelocations, false, \ 609 "Print relocation information for all nmethods when generated") \ 610 \ 611 develop(bool, PrintDependencies, false, \ 612 "Print dependency information for all nmethods when generated") \ 613 \ 614 develop(bool, PrintExceptionHandlers, false, \ 615 "Print exception handler tables for all nmethods when generated") \ 616 \ 617 develop(bool, StressCompiledExceptionHandlers, false, \ 618 "Exercise compiled exception handlers") \ 619 \ 620 develop(bool, InterceptOSException, false, \ 621 "Start debugger when an implicit OS (e.g. NULL) " \ 622 "exception happens") \ 623 \ 624 product(bool, PrintCodeCache, false, \ 625 "Print the code cache memory usage when exiting") \ 626 \ 627 develop(bool, PrintCodeCache2, false, \ 628 "Print detailed usage information on the code cache when exiting")\ 629 \ 630 product(bool, PrintCodeCacheOnCompilation, false, \ 631 "Print the code cache memory usage each time a method is " \ 632 "compiled") \ 633 \ 634 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 635 "Print code heap usage statistics on exit and on full condition") \ 636 \ 637 diagnostic(bool, PrintStubCode, false, \ 638 "Print generated stub code") \ 639 \ 640 product(bool, StackTraceInThrowable, true, \ 641 "Collect backtrace in throwable when exception happens") \ 642 \ 643 product(bool, OmitStackTraceInFastThrow, true, \ 644 "Omit backtraces for some 'hot' exceptions in optimized code") \ 645 \ 646 product(bool, PrintWarnings, true, \ 647 "Print JVM warnings to output stream") \ 648 \ 649 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 650 "Print warnings for stalled SpinLocks") \ 651 \ 652 product(bool, RegisterFinalizersAtInit, true, \ 653 "Register finalizable objects at end of Object.<init> or " \ 654 "after allocation") \ 655 \ 656 develop(bool, RegisterReferences, true, \ 657 "Tell whether the VM should register soft/weak/final/phantom " \ 658 "references") \ 659 \ 660 develop(bool, IgnoreRewrites, false, \ 661 "Suppress rewrites of bytecodes in the oopmap generator. " \ 662 "This is unsafe!") \ 663 \ 664 develop(bool, PrintCodeCacheExtension, false, \ 665 "Print extension of code cache") \ 666 \ 667 develop(bool, UsePrivilegedStack, true, \ 668 "Enable the security JVM functions") \ 669 \ 670 develop(bool, ProtectionDomainVerification, true, \ 671 "Verify protection domain before resolution in system dictionary")\ 672 \ 673 product(bool, ClassUnloading, true, \ 674 "Do unloading of classes") \ 675 \ 676 product(bool, ClassUnloadingWithConcurrentMark, true, \ 677 "Do unloading of classes with a concurrent marking cycle") \ 678 \ 679 develop(bool, DisableStartThread, false, \ 680 "Disable starting of additional Java threads " \ 681 "(for debugging only)") \ 682 \ 683 develop(bool, MemProfiling, false, \ 684 "Write memory usage profiling to log file") \ 685 \ 686 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 687 "Print the system dictionary at exit") \ 688 \ 689 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 690 "Dynamically resize system dictionaries as needed") \ 691 \ 692 product(bool, AlwaysLockClassLoader, false, \ 693 "Require the VM to acquire the class loader lock before calling " \ 694 "loadClass() even for class loaders registering " \ 695 "as parallel capable") \ 696 \ 697 product(bool, AllowParallelDefineClass, false, \ 698 "Allow parallel defineClass requests for class loaders " \ 699 "registering as parallel capable") \ 700 \ 701 product_pd(bool, DontYieldALot, \ 702 "Throw away obvious excess yield calls") \ 703 \ 704 develop(bool, UseDetachedThreads, true, \ 705 "Use detached threads that are recycled upon termination " \ 706 "(for Solaris only)") \ 707 \ 708 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 709 "Disable the use of stack guard pages if the JVM is loaded " \ 710 "on the primordial process thread") \ 711 \ 712 product(bool, UseLWPSynchronization, true, \ 713 "Use LWP-based instead of libthread-based synchronization " \ 714 "(SPARC only)") \ 715 \ 716 product(intx, MonitorBound, 0, "Bound Monitor population") \ 717 range(0, max_jint) \ 718 \ 719 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 720 "Percentage of used monitors before triggering cleanup " \ 721 "safepoint which deflates monitors (0 is off). " \ 722 "The check is performed on GuaranteedSafepointInterval.") \ 723 range(0, 100) \ 724 \ 725 experimental(intx, hashCode, 5, \ 726 "(Unstable) select hashCode generation algorithm") \ 727 \ 728 product(bool, FilterSpuriousWakeups, true, \ 729 "When true prevents OS-level spurious, or premature, wakeups " \ 730 "from Object.wait (Ignored for Windows)") \ 731 \ 732 develop(bool, UsePthreads, false, \ 733 "Use pthread-based instead of libthread-based synchronization " \ 734 "(SPARC only)") \ 735 \ 736 product(bool, ReduceSignalUsage, false, \ 737 "Reduce the use of OS signals in Java and/or the VM") \ 738 \ 739 develop_pd(bool, ShareVtableStubs, \ 740 "Share vtable stubs (smaller code but worse branch prediction") \ 741 \ 742 develop(bool, LoadLineNumberTables, true, \ 743 "Tell whether the class file parser loads line number tables") \ 744 \ 745 develop(bool, LoadLocalVariableTables, true, \ 746 "Tell whether the class file parser loads local variable tables") \ 747 \ 748 develop(bool, LoadLocalVariableTypeTables, true, \ 749 "Tell whether the class file parser loads local variable type" \ 750 "tables") \ 751 \ 752 product(bool, AllowUserSignalHandlers, false, \ 753 "Do not complain if the application installs signal handlers " \ 754 "(Solaris & Linux only)") \ 755 \ 756 product(bool, UseSignalChaining, true, \ 757 "Use signal-chaining to invoke signal handlers installed " \ 758 "by the application (Solaris & Linux only)") \ 759 \ 760 product(bool, RestoreMXCSROnJNICalls, false, \ 761 "Restore MXCSR when returning from JNI calls") \ 762 \ 763 product(bool, CheckJNICalls, false, \ 764 "Verify all arguments to JNI calls") \ 765 \ 766 product(bool, UseFastJNIAccessors, true, \ 767 "Use optimized versions of Get<Primitive>Field") \ 768 \ 769 product(intx, MaxJNILocalCapacity, 65536, \ 770 "Maximum allowable local JNI handle capacity to " \ 771 "EnsureLocalCapacity() and PushLocalFrame(), " \ 772 "where <= 0 is unlimited, default: 65536") \ 773 range(min_intx, max_intx) \ 774 \ 775 product(bool, EagerXrunInit, false, \ 776 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 777 "but not all -Xrun libraries may support the state of the VM " \ 778 "at this time") \ 779 \ 780 product(bool, PreserveAllAnnotations, false, \ 781 "Preserve RuntimeInvisibleAnnotations as well " \ 782 "as RuntimeVisibleAnnotations") \ 783 \ 784 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 785 "Number of OutOfMemoryErrors preallocated with backtrace") \ 786 \ 787 product(bool, UseXMMForArrayCopy, false, \ 788 "Use SSE2 MOVQ instruction for Arraycopy") \ 789 \ 790 product(intx, FieldsAllocationStyle, 1, \ 791 "(Deprecated) 0 - type based with oops first, " \ 792 "1 - with oops last, " \ 793 "2 - oops in super and sub classes are together") \ 794 range(0, 2) \ 795 \ 796 product(bool, CompactFields, true, \ 797 "(Deprecated) Allocate nonstatic fields in gaps " \ 798 "between previous fields") \ 799 \ 800 notproduct(bool, PrintFieldLayout, false, \ 801 "Print field layout for each class") \ 802 \ 803 /* Need to limit the extent of the padding to reasonable size. */\ 804 /* 8K is well beyond the reasonable HW cache line size, even with */\ 805 /* aggressive prefetching, while still leaving the room for segregating */\ 806 /* among the distinct pages. */\ 807 product(intx, ContendedPaddingWidth, 128, \ 808 "How many bytes to pad the fields/classes marked @Contended with")\ 809 range(0, 8192) \ 810 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 811 \ 812 product(bool, EnableContended, true, \ 813 "Enable @Contended annotation support") \ 814 \ 815 product(bool, RestrictContended, true, \ 816 "Restrict @Contended to trusted classes") \ 817 \ 818 product(bool, UseBiasedLocking, true, \ 819 "Enable biased locking in JVM") \ 820 \ 821 product(intx, BiasedLockingStartupDelay, 0, \ 822 "Number of milliseconds to wait before enabling biased locking") \ 823 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 824 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 825 \ 826 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 827 "Print statistics of biased locking in JVM") \ 828 \ 829 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 830 "Threshold of number of revocations per type to try to " \ 831 "rebias all objects in the heap of that type") \ 832 range(0, max_intx) \ 833 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 834 \ 835 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 836 "Threshold of number of revocations per type to permanently " \ 837 "revoke biases of all objects in the heap of that type") \ 838 range(0, max_intx) \ 839 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 840 \ 841 product(intx, BiasedLockingDecayTime, 25000, \ 842 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 843 "type after previous bulk rebias") \ 844 range(500, max_intx) \ 845 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 846 \ 847 product(bool, ExitOnOutOfMemoryError, false, \ 848 "JVM exits on the first occurrence of an out-of-memory error") \ 849 \ 850 product(bool, CrashOnOutOfMemoryError, false, \ 851 "JVM aborts, producing an error log and core/mini dump, on the " \ 852 "first occurrence of an out-of-memory error") \ 853 \ 854 /* tracing */ \ 855 \ 856 develop(bool, StressRewriter, false, \ 857 "Stress linktime bytecode rewriting") \ 858 \ 859 product(ccstr, TraceJVMTI, NULL, \ 860 "Trace flags for JVMTI functions and events") \ 861 \ 862 /* This option can change an EMCP method into an obsolete method. */ \ 863 /* This can affect tests that except specific methods to be EMCP. */ \ 864 /* This option should be used with caution. */ \ 865 product(bool, StressLdcRewrite, false, \ 866 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 867 \ 868 /* change to false by default sometime after Mustang */ \ 869 product(bool, VerifyMergedCPBytecodes, true, \ 870 "Verify bytecodes after RedefineClasses constant pool merging") \ 871 \ 872 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 873 "(Deprecated) Allow redefinition to add and delete private " \ 874 "static or final methods for compatibility with old releases") \ 875 \ 876 develop(bool, TraceBytecodes, false, \ 877 "Trace bytecode execution") \ 878 \ 879 develop(bool, TraceICs, false, \ 880 "Trace inline cache changes") \ 881 \ 882 notproduct(bool, TraceInvocationCounterOverflow, false, \ 883 "Trace method invocation counter overflow") \ 884 \ 885 develop(bool, TraceInlineCacheClearing, false, \ 886 "Trace clearing of inline caches in nmethods") \ 887 \ 888 develop(bool, TraceDependencies, false, \ 889 "Trace dependencies") \ 890 \ 891 develop(bool, VerifyDependencies, trueInDebug, \ 892 "Exercise and verify the compilation dependency mechanism") \ 893 \ 894 develop(bool, TraceNewOopMapGeneration, false, \ 895 "Trace OopMapGeneration") \ 896 \ 897 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 898 "Trace OopMapGeneration: print detailed cell states") \ 899 \ 900 develop(bool, TimeOopMap, false, \ 901 "Time calls to GenerateOopMap::compute_map() in sum") \ 902 \ 903 develop(bool, TimeOopMap2, false, \ 904 "Time calls to GenerateOopMap::compute_map() individually") \ 905 \ 906 develop(bool, TraceOopMapRewrites, false, \ 907 "Trace rewriting of method oops during oop map generation") \ 908 \ 909 develop(bool, TraceICBuffer, false, \ 910 "Trace usage of IC buffer") \ 911 \ 912 develop(bool, TraceCompiledIC, false, \ 913 "Trace changes of compiled IC") \ 914 \ 915 develop(bool, FLSVerifyDictionary, false, \ 916 "Do lots of (expensive) FLS dictionary verification") \ 917 \ 918 \ 919 notproduct(bool, CheckMemoryInitialization, false, \ 920 "Check memory initialization") \ 921 \ 922 product(uintx, ProcessDistributionStride, 4, \ 923 "Stride through processors when distributing processes") \ 924 range(0, max_juint) \ 925 \ 926 develop(bool, TraceFinalizerRegistration, false, \ 927 "Trace registration of final references") \ 928 \ 929 product(bool, IgnoreEmptyClassPaths, false, \ 930 "Ignore empty path elements in -classpath") \ 931 \ 932 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 933 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 934 "Initial size of the boot class loader data metaspace") \ 935 range(30*K, max_uintx/BytesPerWord) \ 936 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 937 \ 938 product(bool, PrintHeapAtSIGBREAK, true, \ 939 "Print heap layout in response to SIGBREAK") \ 940 \ 941 manageable(bool, PrintClassHistogram, false, \ 942 "Print a histogram of class instances") \ 943 \ 944 experimental(double, ObjectCountCutOffPercent, 0.5, \ 945 "The percentage of the used heap that the instances of a class " \ 946 "must occupy for the class to generate a trace event") \ 947 range(0.0, 100.0) \ 948 \ 949 /* JVMTI heap profiling */ \ 950 \ 951 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 952 "Trace JVMTI object tagging calls") \ 953 \ 954 diagnostic(bool, VerifyBeforeIteration, false, \ 955 "Verify memory system before JVMTI iteration") \ 956 \ 957 /* compiler interface */ \ 958 \ 959 develop(bool, CIPrintCompilerName, false, \ 960 "when CIPrint is active, print the name of the active compiler") \ 961 \ 962 diagnostic(bool, CIPrintCompileQueue, false, \ 963 "display the contents of the compile queue whenever a " \ 964 "compilation is enqueued") \ 965 \ 966 develop(bool, CIPrintRequests, false, \ 967 "display every request for compilation") \ 968 \ 969 product(bool, CITime, false, \ 970 "collect timing information for compilation") \ 971 \ 972 develop(bool, CITimeVerbose, false, \ 973 "be more verbose in compilation timings") \ 974 \ 975 develop(bool, CITimeEach, false, \ 976 "display timing information after each successful compilation") \ 977 \ 978 develop(bool, CICountOSR, false, \ 979 "use a separate counter when assigning ids to osr compilations") \ 980 \ 981 develop(bool, CICompileNatives, true, \ 982 "compile native methods if supported by the compiler") \ 983 \ 984 develop_pd(bool, CICompileOSR, \ 985 "compile on stack replacement methods if supported by the " \ 986 "compiler") \ 987 \ 988 develop(bool, CIPrintMethodCodes, false, \ 989 "print method bytecodes of the compiled code") \ 990 \ 991 develop(bool, CIPrintTypeFlow, false, \ 992 "print the results of ciTypeFlow analysis") \ 993 \ 994 develop(bool, CITraceTypeFlow, false, \ 995 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 996 \ 997 develop(intx, OSROnlyBCI, -1, \ 998 "OSR only at this bci. Negative values mean exclude that bci") \ 999 \ 1000 /* compiler */ \ 1001 \ 1002 /* notice: the max range value here is max_jint, not max_intx */ \ 1003 /* because of overflow issue */ \ 1004 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 1005 "Number of compiler threads to run") \ 1006 range(0, max_jint) \ 1007 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 1008 \ 1009 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 1010 "Dynamically choose the number of parallel compiler threads") \ 1011 \ 1012 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1013 "Reduce the number of parallel compiler threads when they " \ 1014 "are not used") \ 1015 \ 1016 diagnostic(bool, TraceCompilerThreads, false, \ 1017 "Trace creation and removal of compiler threads") \ 1018 \ 1019 develop(bool, InjectCompilerCreationFailure, false, \ 1020 "Inject thread creation failures for " \ 1021 "UseDynamicNumberOfCompilerThreads") \ 1022 \ 1023 product(intx, CompilationPolicyChoice, 0, \ 1024 "which compilation policy (0-2)") \ 1025 range(0, 2) \ 1026 \ 1027 develop(bool, UseStackBanging, true, \ 1028 "use stack banging for stack overflow checks (required for " \ 1029 "proper StackOverflow handling; disable only to measure cost " \ 1030 "of stackbanging)") \ 1031 \ 1032 develop(bool, UseStrictFP, true, \ 1033 "use strict fp if modifier strictfp is set") \ 1034 \ 1035 develop(bool, GenerateSynchronizationCode, true, \ 1036 "generate locking/unlocking code for synchronized methods and " \ 1037 "monitors") \ 1038 \ 1039 develop(bool, GenerateRangeChecks, true, \ 1040 "Generate range checks for array accesses") \ 1041 \ 1042 diagnostic_pd(bool, ImplicitNullChecks, \ 1043 "Generate code for implicit null checks") \ 1044 \ 1045 product_pd(bool, TrapBasedNullChecks, \ 1046 "Generate code for null checks that uses a cmp and trap " \ 1047 "instruction raising SIGTRAP. This is only used if an access to" \ 1048 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1049 "ImplicitNullChecks don't work (PPC64).") \ 1050 \ 1051 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1052 "Enable Thread SMR extra validity checks") \ 1053 \ 1054 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1055 "Enable Thread SMR Statistics") \ 1056 \ 1057 product(bool, Inline, true, \ 1058 "Enable inlining") \ 1059 \ 1060 product(bool, ClipInlining, true, \ 1061 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1062 \ 1063 develop(bool, UseCHA, true, \ 1064 "Enable CHA") \ 1065 \ 1066 product(bool, UseTypeProfile, true, \ 1067 "Check interpreter profile for historically monomorphic calls") \ 1068 \ 1069 diagnostic(bool, PrintInlining, false, \ 1070 "Print inlining optimizations") \ 1071 \ 1072 product(bool, UsePopCountInstruction, false, \ 1073 "Use population count instruction") \ 1074 \ 1075 develop(bool, EagerInitialization, false, \ 1076 "Eagerly initialize classes if possible") \ 1077 \ 1078 diagnostic(bool, LogTouchedMethods, false, \ 1079 "Log methods which have been ever touched in runtime") \ 1080 \ 1081 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1082 "Print all methods that have been ever touched in runtime") \ 1083 \ 1084 develop(bool, TraceMethodReplacement, false, \ 1085 "Print when methods are replaced do to recompilation") \ 1086 \ 1087 develop(bool, PrintMethodFlushing, false, \ 1088 "Print the nmethods being flushed") \ 1089 \ 1090 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1091 "print statistics about method flushing") \ 1092 \ 1093 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1094 "Number of compiled code invocations after which " \ 1095 "the method is considered as hot by the flusher") \ 1096 range(1, max_jint) \ 1097 \ 1098 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1099 "Minimum number of sweeper passes before an nmethod " \ 1100 "can be flushed") \ 1101 range(0, max_intx) \ 1102 \ 1103 product(bool, UseCodeAging, true, \ 1104 "Insert counter to detect warm methods") \ 1105 \ 1106 diagnostic(bool, StressCodeAging, false, \ 1107 "Start with counters compiled in") \ 1108 \ 1109 develop(bool, StressCodeBuffers, false, \ 1110 "Exercise code buffer expansion and other rare state changes") \ 1111 \ 1112 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1113 "Generate extra debugging information for non-safepoints in " \ 1114 "nmethods") \ 1115 \ 1116 product(bool, PrintVMOptions, false, \ 1117 "Print flags that appeared on the command line") \ 1118 \ 1119 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1120 "Ignore unrecognized VM options") \ 1121 \ 1122 product(bool, PrintCommandLineFlags, false, \ 1123 "Print flags specified on command line or set by ergonomics") \ 1124 \ 1125 product(bool, PrintFlagsInitial, false, \ 1126 "Print all VM flags before argument processing and exit VM") \ 1127 \ 1128 product(bool, PrintFlagsFinal, false, \ 1129 "Print all VM flags after argument and ergonomic processing") \ 1130 \ 1131 notproduct(bool, PrintFlagsWithComments, false, \ 1132 "Print all VM flags with default values and descriptions and " \ 1133 "exit") \ 1134 \ 1135 product(bool, PrintFlagsRanges, false, \ 1136 "Print VM flags and their ranges") \ 1137 \ 1138 diagnostic(bool, SerializeVMOutput, true, \ 1139 "Use a mutex to serialize output to tty and LogFile") \ 1140 \ 1141 diagnostic(bool, DisplayVMOutput, true, \ 1142 "Display all VM output on the tty, independently of LogVMOutput") \ 1143 \ 1144 diagnostic(bool, LogVMOutput, false, \ 1145 "Save VM output to LogFile") \ 1146 \ 1147 diagnostic(ccstr, LogFile, NULL, \ 1148 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1149 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1150 \ 1151 product(ccstr, ErrorFile, NULL, \ 1152 "If an error occurs, save the error data to this file " \ 1153 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1154 \ 1155 product(bool, ExtensiveErrorReports, \ 1156 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1157 "Error reports are more extensive.") \ 1158 \ 1159 product(bool, DisplayVMOutputToStderr, false, \ 1160 "If DisplayVMOutput is true, display all VM output to stderr") \ 1161 \ 1162 product(bool, DisplayVMOutputToStdout, false, \ 1163 "If DisplayVMOutput is true, display all VM output to stdout") \ 1164 \ 1165 product(bool, ErrorFileToStderr, false, \ 1166 "If true, error data is printed to stderr instead of a file") \ 1167 \ 1168 product(bool, ErrorFileToStdout, false, \ 1169 "If true, error data is printed to stdout instead of a file") \ 1170 \ 1171 product(bool, UseHeavyMonitors, false, \ 1172 "use heavyweight instead of lightweight Java monitors") \ 1173 \ 1174 product(bool, PrintStringTableStatistics, false, \ 1175 "print statistics about the StringTable and SymbolTable") \ 1176 \ 1177 diagnostic(bool, VerifyStringTableAtExit, false, \ 1178 "verify StringTable contents at exit") \ 1179 \ 1180 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1181 "print histogram of the symbol table") \ 1182 \ 1183 notproduct(bool, ExitVMOnVerifyError, false, \ 1184 "standard exit from VM if bytecode verify error " \ 1185 "(only in debug mode)") \ 1186 \ 1187 diagnostic(ccstr, AbortVMOnException, NULL, \ 1188 "Call fatal if this exception is thrown. Example: " \ 1189 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1190 \ 1191 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1192 "Call fatal if the exception pointed by AbortVMOnException " \ 1193 "has this message") \ 1194 \ 1195 develop(bool, DebugVtables, false, \ 1196 "add debugging code to vtable dispatch") \ 1197 \ 1198 notproduct(bool, PrintVtableStats, false, \ 1199 "print vtables stats at end of run") \ 1200 \ 1201 develop(bool, TraceCreateZombies, false, \ 1202 "trace creation of zombie nmethods") \ 1203 \ 1204 notproduct(bool, IgnoreLockingAssertions, false, \ 1205 "disable locking assertions (for speed)") \ 1206 \ 1207 product(bool, RangeCheckElimination, true, \ 1208 "Eliminate range checks") \ 1209 \ 1210 develop_pd(bool, UncommonNullCast, \ 1211 "track occurrences of null in casts; adjust compiler tactics") \ 1212 \ 1213 develop(bool, TypeProfileCasts, true, \ 1214 "treat casts like calls for purposes of type profiling") \ 1215 \ 1216 develop(bool, TraceLivenessGen, false, \ 1217 "Trace the generation of liveness analysis information") \ 1218 \ 1219 notproduct(bool, TraceLivenessQuery, false, \ 1220 "Trace queries of liveness analysis information") \ 1221 \ 1222 notproduct(bool, CollectIndexSetStatistics, false, \ 1223 "Collect information about IndexSets") \ 1224 \ 1225 develop(bool, UseLoopSafepoints, true, \ 1226 "Generate Safepoint nodes in every loop") \ 1227 \ 1228 develop(intx, FastAllocateSizeLimit, 128*K, \ 1229 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1230 "Inline allocations larger than this in doublewords must go slow")\ 1231 \ 1232 product_pd(bool, CompactStrings, \ 1233 "Enable Strings to use single byte chars in backing store") \ 1234 \ 1235 product_pd(uintx, TypeProfileLevel, \ 1236 "=XYZ, with Z: Type profiling of arguments at call; " \ 1237 "Y: Type profiling of return value at call; " \ 1238 "X: Type profiling of parameters to methods; " \ 1239 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1240 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1241 \ 1242 product(intx, TypeProfileArgsLimit, 2, \ 1243 "max number of call arguments to consider for type profiling") \ 1244 range(0, 16) \ 1245 \ 1246 product(intx, TypeProfileParmsLimit, 2, \ 1247 "max number of incoming parameters to consider for type profiling"\ 1248 ", -1 for all") \ 1249 range(-1, 64) \ 1250 \ 1251 /* statistics */ \ 1252 develop(bool, CountCompiledCalls, false, \ 1253 "Count method invocations") \ 1254 \ 1255 notproduct(bool, CountRuntimeCalls, false, \ 1256 "Count VM runtime calls") \ 1257 \ 1258 develop(bool, CountJNICalls, false, \ 1259 "Count jni method invocations") \ 1260 \ 1261 notproduct(bool, CountJVMCalls, false, \ 1262 "Count jvm method invocations") \ 1263 \ 1264 notproduct(bool, CountRemovableExceptions, false, \ 1265 "Count exceptions that could be replaced by branches due to " \ 1266 "inlining") \ 1267 \ 1268 notproduct(bool, ICMissHistogram, false, \ 1269 "Produce histogram of IC misses") \ 1270 \ 1271 /* interpreter */ \ 1272 product_pd(bool, RewriteBytecodes, \ 1273 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1274 \ 1275 product_pd(bool, RewriteFrequentPairs, \ 1276 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1277 \ 1278 diagnostic(bool, PrintInterpreter, false, \ 1279 "Print the generated interpreter code") \ 1280 \ 1281 product(bool, UseInterpreter, true, \ 1282 "Use interpreter for non-compiled methods") \ 1283 \ 1284 develop(bool, UseFastSignatureHandlers, true, \ 1285 "Use fast signature handlers for native calls") \ 1286 \ 1287 product(bool, UseLoopCounter, true, \ 1288 "Increment invocation counter on backward branch") \ 1289 \ 1290 product_pd(bool, UseOnStackReplacement, \ 1291 "Use on stack replacement, calls runtime if invoc. counter " \ 1292 "overflows in loop") \ 1293 \ 1294 notproduct(bool, TraceOnStackReplacement, false, \ 1295 "Trace on stack replacement") \ 1296 \ 1297 product_pd(bool, PreferInterpreterNativeStubs, \ 1298 "Use always interpreter stubs for native methods invoked via " \ 1299 "interpreter") \ 1300 \ 1301 develop(bool, CountBytecodes, false, \ 1302 "Count number of bytecodes executed") \ 1303 \ 1304 develop(bool, PrintBytecodeHistogram, false, \ 1305 "Print histogram of the executed bytecodes") \ 1306 \ 1307 develop(bool, PrintBytecodePairHistogram, false, \ 1308 "Print histogram of the executed bytecode pairs") \ 1309 \ 1310 diagnostic(bool, PrintSignatureHandlers, false, \ 1311 "Print code generated for native method signature handlers") \ 1312 \ 1313 develop(bool, VerifyOops, false, \ 1314 "Do plausibility checks for oops") \ 1315 \ 1316 develop(bool, CheckUnhandledOops, false, \ 1317 "Check for unhandled oops in VM code") \ 1318 \ 1319 develop(bool, VerifyJNIFields, trueInDebug, \ 1320 "Verify jfieldIDs for instance fields") \ 1321 \ 1322 notproduct(bool, VerifyJNIEnvThread, false, \ 1323 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1324 "from JNI") \ 1325 \ 1326 develop(bool, VerifyFPU, false, \ 1327 "Verify FPU state (check for NaN's, etc.)") \ 1328 \ 1329 develop(bool, VerifyThread, false, \ 1330 "Watch the thread register for corruption (SPARC only)") \ 1331 \ 1332 develop(bool, VerifyActivationFrameSize, false, \ 1333 "Verify that activation frame didn't become smaller than its " \ 1334 "minimal size") \ 1335 \ 1336 develop(bool, TraceFrequencyInlining, false, \ 1337 "Trace frequency based inlining") \ 1338 \ 1339 develop_pd(bool, InlineIntrinsics, \ 1340 "Inline intrinsics that can be statically resolved") \ 1341 \ 1342 product_pd(bool, ProfileInterpreter, \ 1343 "Profile at the bytecode level during interpretation") \ 1344 \ 1345 develop(bool, TraceProfileInterpreter, false, \ 1346 "Trace profiling at the bytecode level during interpretation. " \ 1347 "This outputs the profiling information collected to improve " \ 1348 "jit compilation.") \ 1349 \ 1350 develop_pd(bool, ProfileTraps, \ 1351 "Profile deoptimization traps at the bytecode level") \ 1352 \ 1353 product(intx, ProfileMaturityPercentage, 20, \ 1354 "number of method invocations/branches (expressed as % of " \ 1355 "CompileThreshold) before using the method's profile") \ 1356 range(0, 100) \ 1357 \ 1358 diagnostic(bool, PrintMethodData, false, \ 1359 "Print the results of +ProfileInterpreter at end of run") \ 1360 \ 1361 develop(bool, VerifyDataPointer, trueInDebug, \ 1362 "Verify the method data pointer during interpreter profiling") \ 1363 \ 1364 develop(bool, VerifyCompiledCode, false, \ 1365 "Include miscellaneous runtime verifications in nmethod code; " \ 1366 "default off because it disturbs nmethod size heuristics") \ 1367 \ 1368 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1369 "Manually make GC thread crash then dump java stack trace; " \ 1370 "Test only") \ 1371 \ 1372 /* compilation */ \ 1373 product(bool, UseCompiler, true, \ 1374 "Use Just-In-Time compilation") \ 1375 \ 1376 product(bool, UseCounterDecay, true, \ 1377 "Adjust recompilation counters") \ 1378 \ 1379 develop(intx, CounterHalfLifeTime, 30, \ 1380 "Half-life time of invocation counters (in seconds)") \ 1381 \ 1382 develop(intx, CounterDecayMinIntervalLength, 500, \ 1383 "The minimum interval (in milliseconds) between invocation of " \ 1384 "CounterDecay") \ 1385 \ 1386 product(bool, AlwaysCompileLoopMethods, false, \ 1387 "When using recompilation, never interpret methods " \ 1388 "containing loops") \ 1389 \ 1390 product(bool, DontCompileHugeMethods, true, \ 1391 "Do not compile methods > HugeMethodLimit") \ 1392 \ 1393 /* Bytecode escape analysis estimation. */ \ 1394 product(bool, EstimateArgEscape, true, \ 1395 "Analyze bytecodes to estimate escape state of arguments") \ 1396 \ 1397 product(intx, BCEATraceLevel, 0, \ 1398 "How much tracing to do of bytecode escape analysis estimates " \ 1399 "(0-3)") \ 1400 range(0, 3) \ 1401 \ 1402 product(intx, MaxBCEAEstimateLevel, 5, \ 1403 "Maximum number of nested calls that are analyzed by BC EA") \ 1404 range(0, max_jint) \ 1405 \ 1406 product(intx, MaxBCEAEstimateSize, 150, \ 1407 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1408 range(0, max_jint) \ 1409 \ 1410 product(intx, AllocatePrefetchStyle, 1, \ 1411 "0 = no prefetch, " \ 1412 "1 = generate prefetch instructions for each allocation, " \ 1413 "2 = use TLAB watermark to gate allocation prefetch, " \ 1414 "3 = generate one prefetch instruction per cache line") \ 1415 range(0, 3) \ 1416 \ 1417 product(intx, AllocatePrefetchDistance, -1, \ 1418 "Distance to prefetch ahead of allocation pointer. " \ 1419 "-1: use system-specific value (automatically determined") \ 1420 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 1421 \ 1422 product(intx, AllocatePrefetchLines, 3, \ 1423 "Number of lines to prefetch ahead of array allocation pointer") \ 1424 range(1, 64) \ 1425 \ 1426 product(intx, AllocateInstancePrefetchLines, 1, \ 1427 "Number of lines to prefetch ahead of instance allocation " \ 1428 "pointer") \ 1429 range(1, 64) \ 1430 \ 1431 product(intx, AllocatePrefetchStepSize, 16, \ 1432 "Step size in bytes of sequential prefetch instructions") \ 1433 range(1, 512) \ 1434 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1435 \ 1436 product(intx, AllocatePrefetchInstr, 0, \ 1437 "Select instruction to prefetch ahead of allocation pointer") \ 1438 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1439 \ 1440 /* deoptimization */ \ 1441 develop(bool, TraceDeoptimization, false, \ 1442 "Trace deoptimization") \ 1443 \ 1444 develop(bool, PrintDeoptimizationDetails, false, \ 1445 "Print more information about deoptimization") \ 1446 \ 1447 develop(bool, DebugDeoptimization, false, \ 1448 "Tracing various information while debugging deoptimization") \ 1449 \ 1450 product(intx, SelfDestructTimer, 0, \ 1451 "Will cause VM to terminate after a given time (in minutes) " \ 1452 "(0 means off)") \ 1453 range(0, max_intx) \ 1454 \ 1455 product(intx, MaxJavaStackTraceDepth, 1024, \ 1456 "The maximum number of lines in the stack trace for Java " \ 1457 "exceptions (0 means all)") \ 1458 range(0, max_jint/2) \ 1459 \ 1460 /* notice: the max range value here is max_jint, not max_intx */ \ 1461 /* because of overflow issue */ \ 1462 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1463 "Guarantee a safepoint (at least) every so many milliseconds " \ 1464 "(0 means none)") \ 1465 range(0, max_jint) \ 1466 \ 1467 product(intx, SafepointTimeoutDelay, 10000, \ 1468 "Delay in milliseconds for option SafepointTimeout") \ 1469 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1470 NOT_LP64(range(0, max_intx)) \ 1471 \ 1472 product(intx, NmethodSweepActivity, 10, \ 1473 "Removes cold nmethods from code cache if > 0. Higher values " \ 1474 "result in more aggressive sweeping") \ 1475 range(0, 2000) \ 1476 \ 1477 notproduct(bool, LogSweeper, false, \ 1478 "Keep a ring buffer of sweeper activity") \ 1479 \ 1480 notproduct(intx, SweeperLogEntries, 1024, \ 1481 "Number of records in the ring buffer of sweeper activity") \ 1482 \ 1483 notproduct(intx, MemProfilingInterval, 500, \ 1484 "Time between each invocation of the MemProfiler") \ 1485 \ 1486 develop(intx, MallocCatchPtr, -1, \ 1487 "Hit breakpoint when mallocing/freeing this pointer") \ 1488 \ 1489 notproduct(ccstrlist, SuppressErrorAt, "", \ 1490 "List of assertions (file:line) to muzzle") \ 1491 \ 1492 develop(intx, StackPrintLimit, 100, \ 1493 "number of stack frames to print in VM-level stack dump") \ 1494 \ 1495 notproduct(intx, MaxElementPrintSize, 256, \ 1496 "maximum number of elements to print") \ 1497 \ 1498 notproduct(intx, MaxSubklassPrintSize, 4, \ 1499 "maximum number of subklasses to print when printing klass") \ 1500 \ 1501 product(intx, MaxInlineLevel, 9, \ 1502 "maximum number of nested calls that are inlined") \ 1503 range(0, max_jint) \ 1504 \ 1505 product(intx, MaxRecursiveInlineLevel, 1, \ 1506 "maximum number of nested recursive calls that are inlined") \ 1507 range(0, max_jint) \ 1508 \ 1509 develop(intx, MaxForceInlineLevel, 100, \ 1510 "maximum number of nested calls that are forced for inlining " \ 1511 "(using CompileCommand or marked w/ @ForceInline)") \ 1512 range(0, max_jint) \ 1513 \ 1514 product_pd(intx, InlineSmallCode, \ 1515 "Only inline already compiled methods if their code size is " \ 1516 "less than this") \ 1517 range(0, max_jint) \ 1518 \ 1519 product(intx, MaxInlineSize, 35, \ 1520 "The maximum bytecode size of a method to be inlined") \ 1521 range(0, max_jint) \ 1522 \ 1523 product_pd(intx, FreqInlineSize, \ 1524 "The maximum bytecode size of a frequent method to be inlined") \ 1525 range(0, max_jint) \ 1526 \ 1527 product(intx, MaxTrivialSize, 6, \ 1528 "The maximum bytecode size of a trivial method to be inlined") \ 1529 range(0, max_jint) \ 1530 \ 1531 product(intx, MinInliningThreshold, 250, \ 1532 "The minimum invocation count a method needs to have to be " \ 1533 "inlined") \ 1534 range(0, max_jint) \ 1535 \ 1536 develop(intx, MethodHistogramCutoff, 100, \ 1537 "The cutoff value for method invocation histogram (+CountCalls)") \ 1538 \ 1539 develop(intx, DontYieldALotInterval, 10, \ 1540 "Interval between which yields will be dropped (milliseconds)") \ 1541 \ 1542 notproduct(intx, DeoptimizeALotInterval, 5, \ 1543 "Number of exits until DeoptimizeALot kicks in") \ 1544 \ 1545 notproduct(intx, ZombieALotInterval, 5, \ 1546 "Number of exits until ZombieALot kicks in") \ 1547 \ 1548 diagnostic(uintx, MallocMaxTestWords, 0, \ 1549 "If non-zero, maximum number of words that malloc/realloc can " \ 1550 "allocate (for testing only)") \ 1551 range(0, max_uintx) \ 1552 \ 1553 product(intx, TypeProfileWidth, 2, \ 1554 "Number of receiver types to record in call/cast profile") \ 1555 range(0, 8) \ 1556 \ 1557 develop(intx, BciProfileWidth, 2, \ 1558 "Number of return bci's to record in ret profile") \ 1559 \ 1560 product(intx, PerMethodRecompilationCutoff, 400, \ 1561 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1562 range(-1, max_intx) \ 1563 \ 1564 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1565 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1566 range(-1, max_intx) \ 1567 \ 1568 product(intx, PerMethodTrapLimit, 100, \ 1569 "Limit on traps (of one kind) in a method (includes inlines)") \ 1570 range(0, max_jint) \ 1571 \ 1572 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1573 "Limit on speculative traps (of one kind) in a method " \ 1574 "(includes inlines)") \ 1575 range(0, max_jint) \ 1576 \ 1577 product(intx, PerBytecodeTrapLimit, 4, \ 1578 "Limit on traps (of one kind) at a particular BCI") \ 1579 range(0, max_jint) \ 1580 \ 1581 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1582 "Extra method data trap entries for speculation") \ 1583 \ 1584 develop(intx, InlineFrequencyRatio, 20, \ 1585 "Ratio of call site execution to caller method invocation") \ 1586 range(0, max_jint) \ 1587 \ 1588 diagnostic_pd(intx, InlineFrequencyCount, \ 1589 "Count of call site execution necessary to trigger frequent " \ 1590 "inlining") \ 1591 range(0, max_jint) \ 1592 \ 1593 develop(intx, InlineThrowCount, 50, \ 1594 "Force inlining of interpreted methods that throw this often") \ 1595 range(0, max_jint) \ 1596 \ 1597 develop(intx, InlineThrowMaxSize, 200, \ 1598 "Force inlining of throwing methods smaller than this") \ 1599 range(0, max_jint) \ 1600 \ 1601 develop(intx, ProfilerNodeSize, 1024, \ 1602 "Size in K to allocate for the Profile Nodes of each thread") \ 1603 range(0, 1024) \ 1604 \ 1605 product_pd(size_t, MetaspaceSize, \ 1606 "Initial threshold (in bytes) at which a garbage collection " \ 1607 "is done to reduce Metaspace usage") \ 1608 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1609 \ 1610 product(size_t, MaxMetaspaceSize, max_uintx, \ 1611 "Maximum size of Metaspaces (in bytes)") \ 1612 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1613 \ 1614 product(size_t, CompressedClassSpaceSize, 1*G, \ 1615 "Maximum size of class area in Metaspace when compressed " \ 1616 "class pointers are used") \ 1617 range(1*M, 3*G) \ 1618 \ 1619 manageable(uintx, MinHeapFreeRatio, 40, \ 1620 "The minimum percentage of heap free after GC to avoid expansion."\ 1621 " For most GCs this applies to the old generation. In G1 and" \ 1622 " ParallelGC it applies to the whole heap.") \ 1623 range(0, 100) \ 1624 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1625 \ 1626 manageable(uintx, MaxHeapFreeRatio, 70, \ 1627 "The maximum percentage of heap free after GC to avoid shrinking."\ 1628 " For most GCs this applies to the old generation. In G1 and" \ 1629 " ParallelGC it applies to the whole heap.") \ 1630 range(0, 100) \ 1631 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1632 \ 1633 product(bool, ShrinkHeapInSteps, true, \ 1634 "When disabled, informs the GC to shrink the java heap directly" \ 1635 " to the target size at the next full GC rather than requiring" \ 1636 " smaller steps during multiple full GCs.") \ 1637 \ 1638 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1639 "Number of milliseconds per MB of free space in the heap") \ 1640 range(0, max_intx) \ 1641 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1642 \ 1643 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1644 "The minimum change in heap space due to GC (in bytes)") \ 1645 range(0, max_uintx) \ 1646 \ 1647 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1648 "The minimum expansion of Metaspace (in bytes)") \ 1649 range(0, max_uintx) \ 1650 \ 1651 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1652 "The maximum percentage of Metaspace free after GC to avoid " \ 1653 "shrinking") \ 1654 range(0, 100) \ 1655 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1656 \ 1657 product(uintx, MinMetaspaceFreeRatio, 40, \ 1658 "The minimum percentage of Metaspace free after GC to avoid " \ 1659 "expansion") \ 1660 range(0, 99) \ 1661 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1662 \ 1663 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1664 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1665 range(0, max_uintx) \ 1666 \ 1667 /* stack parameters */ \ 1668 product_pd(intx, StackYellowPages, \ 1669 "Number of yellow zone (recoverable overflows) pages of size " \ 1670 "4KB. If pages are bigger yellow zone is aligned up.") \ 1671 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1672 \ 1673 product_pd(intx, StackRedPages, \ 1674 "Number of red zone (unrecoverable overflows) pages of size " \ 1675 "4KB. If pages are bigger red zone is aligned up.") \ 1676 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1677 \ 1678 product_pd(intx, StackReservedPages, \ 1679 "Number of reserved zone (reserved to annotated methods) pages" \ 1680 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1681 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1682 \ 1683 product(bool, RestrictReservedStack, true, \ 1684 "Restrict @ReservedStackAccess to trusted classes") \ 1685 \ 1686 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1687 product_pd(intx, StackShadowPages, \ 1688 "Number of shadow zone (for overflow checking) pages of size " \ 1689 "4KB. If pages are bigger shadow zone is aligned up. " \ 1690 "This should exceed the depth of the VM and native call stack.") \ 1691 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1692 \ 1693 product_pd(intx, ThreadStackSize, \ 1694 "Thread Stack Size (in Kbytes)") \ 1695 range(0, 1 * M) \ 1696 \ 1697 product_pd(intx, VMThreadStackSize, \ 1698 "Non-Java Thread Stack Size (in Kbytes)") \ 1699 range(0, max_intx/(1 * K)) \ 1700 \ 1701 product_pd(intx, CompilerThreadStackSize, \ 1702 "Compiler Thread Stack Size (in Kbytes)") \ 1703 range(0, max_intx/(1 * K)) \ 1704 \ 1705 develop_pd(size_t, JVMInvokeMethodSlack, \ 1706 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1707 \ 1708 /* code cache parameters */ \ 1709 develop_pd(uintx, CodeCacheSegmentSize, \ 1710 "Code cache segment size (in bytes) - smallest unit of " \ 1711 "allocation") \ 1712 range(1, 1024) \ 1713 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1714 \ 1715 develop_pd(intx, CodeEntryAlignment, \ 1716 "Code entry alignment for generated code (in bytes)") \ 1717 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1718 \ 1719 product_pd(intx, OptoLoopAlignment, \ 1720 "Align inner loops to zero relative to this modulus") \ 1721 range(1, 16) \ 1722 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1723 \ 1724 product_pd(uintx, InitialCodeCacheSize, \ 1725 "Initial code cache size (in bytes)") \ 1726 range(os::vm_page_size(), max_uintx) \ 1727 \ 1728 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1729 "Minimum code cache size (in bytes) required to start VM.") \ 1730 range(0, max_uintx) \ 1731 \ 1732 product(bool, SegmentedCodeCache, false, \ 1733 "Use a segmented code cache") \ 1734 \ 1735 product_pd(uintx, ReservedCodeCacheSize, \ 1736 "Reserved code cache size (in bytes) - maximum code cache size") \ 1737 range(os::vm_page_size(), max_uintx) \ 1738 \ 1739 product_pd(uintx, NonProfiledCodeHeapSize, \ 1740 "Size of code heap with non-profiled methods (in bytes)") \ 1741 range(0, max_uintx) \ 1742 \ 1743 product_pd(uintx, ProfiledCodeHeapSize, \ 1744 "Size of code heap with profiled methods (in bytes)") \ 1745 range(0, max_uintx) \ 1746 \ 1747 product_pd(uintx, NonNMethodCodeHeapSize, \ 1748 "Size of code heap with non-nmethods (in bytes)") \ 1749 range(os::vm_page_size(), max_uintx) \ 1750 \ 1751 product_pd(uintx, CodeCacheExpansionSize, \ 1752 "Code cache expansion size (in bytes)") \ 1753 range(32*K, max_uintx) \ 1754 \ 1755 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1756 "Minimum number of segments in a code cache block") \ 1757 range(1, 100) \ 1758 \ 1759 notproduct(bool, ExitOnFullCodeCache, false, \ 1760 "Exit the VM if we fill the code cache") \ 1761 \ 1762 product(bool, UseCodeCacheFlushing, true, \ 1763 "Remove cold/old nmethods from the code cache") \ 1764 \ 1765 product(uintx, StartAggressiveSweepingAt, 10, \ 1766 "Start aggressive sweeping if X[%] of the code cache is free." \ 1767 "Segmented code cache: X[%] of the non-profiled heap." \ 1768 "Non-segmented code cache: X[%] of the total code cache") \ 1769 range(0, 100) \ 1770 \ 1771 /* AOT parameters */ \ 1772 experimental(bool, UseAOT, false, \ 1773 "Use AOT compiled files") \ 1774 \ 1775 experimental(ccstrlist, AOTLibrary, NULL, \ 1776 "AOT library") \ 1777 \ 1778 experimental(bool, PrintAOT, false, \ 1779 "Print used AOT klasses and methods") \ 1780 \ 1781 notproduct(bool, PrintAOTStatistics, false, \ 1782 "Print AOT statistics") \ 1783 \ 1784 diagnostic(bool, UseAOTStrictLoading, false, \ 1785 "Exit the VM if any of the AOT libraries has invalid config") \ 1786 \ 1787 product(bool, CalculateClassFingerprint, false, \ 1788 "Calculate class fingerprint") \ 1789 \ 1790 /* interpreter debugging */ \ 1791 develop(intx, BinarySwitchThreshold, 5, \ 1792 "Minimal number of lookupswitch entries for rewriting to binary " \ 1793 "switch") \ 1794 \ 1795 develop(intx, StopInterpreterAt, 0, \ 1796 "Stop interpreter execution at specified bytecode number") \ 1797 \ 1798 develop(intx, TraceBytecodesAt, 0, \ 1799 "Trace bytecodes starting with specified bytecode number") \ 1800 \ 1801 /* compiler interface */ \ 1802 develop(intx, CIStart, 0, \ 1803 "The id of the first compilation to permit") \ 1804 \ 1805 develop(intx, CIStop, max_jint, \ 1806 "The id of the last compilation to permit") \ 1807 \ 1808 develop(intx, CIStartOSR, 0, \ 1809 "The id of the first osr compilation to permit " \ 1810 "(CICountOSR must be on)") \ 1811 \ 1812 develop(intx, CIStopOSR, max_jint, \ 1813 "The id of the last osr compilation to permit " \ 1814 "(CICountOSR must be on)") \ 1815 \ 1816 develop(intx, CIBreakAtOSR, -1, \ 1817 "The id of osr compilation to break at") \ 1818 \ 1819 develop(intx, CIBreakAt, -1, \ 1820 "The id of compilation to break at") \ 1821 \ 1822 product(ccstrlist, CompileOnly, "", \ 1823 "List of methods (pkg/class.name) to restrict compilation to") \ 1824 \ 1825 product(ccstr, CompileCommandFile, NULL, \ 1826 "Read compiler commands from this file [.hotspot_compiler]") \ 1827 \ 1828 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1829 "Read compiler directives from this file") \ 1830 \ 1831 product(ccstrlist, CompileCommand, "", \ 1832 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1833 \ 1834 develop(bool, ReplayCompiles, false, \ 1835 "Enable replay of compilations from ReplayDataFile") \ 1836 \ 1837 product(ccstr, ReplayDataFile, NULL, \ 1838 "File containing compilation replay information" \ 1839 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1840 \ 1841 product(ccstr, InlineDataFile, NULL, \ 1842 "File containing inlining replay information" \ 1843 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1844 \ 1845 develop(intx, ReplaySuppressInitializers, 2, \ 1846 "Control handling of class initialization during replay: " \ 1847 "0 - don't do anything special; " \ 1848 "1 - treat all class initializers as empty; " \ 1849 "2 - treat class initializers for application classes as empty; " \ 1850 "3 - allow all class initializers to run during bootstrap but " \ 1851 " pretend they are empty after starting replay") \ 1852 range(0, 3) \ 1853 \ 1854 develop(bool, ReplayIgnoreInitErrors, false, \ 1855 "Ignore exceptions thrown during initialization for replay") \ 1856 \ 1857 product(bool, DumpReplayDataOnError, true, \ 1858 "Record replay data for crashing compiler threads") \ 1859 \ 1860 product(bool, CICompilerCountPerCPU, false, \ 1861 "1 compiler thread for log(N CPUs)") \ 1862 \ 1863 notproduct(intx, CICrashAt, -1, \ 1864 "id of compilation to trigger assert in compiler thread for " \ 1865 "the purpose of testing, e.g. generation of replay data") \ 1866 notproduct(bool, CIObjectFactoryVerify, false, \ 1867 "enable potentially expensive verification in ciObjectFactory") \ 1868 \ 1869 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1870 "Abort VM when method had failed to compile.") \ 1871 \ 1872 /* Priorities */ \ 1873 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1874 \ 1875 product(intx, ThreadPriorityPolicy, 0, \ 1876 "0 : Normal. "\ 1877 " VM chooses priorities that are appropriate for normal "\ 1878 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1879 " to normal native priority. Java priorities below " \ 1880 " NORM_PRIORITY map to lower native priority values. On "\ 1881 " Windows applications are allowed to use higher native "\ 1882 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1883 " not use the highest possible native priority, "\ 1884 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1885 " system threads. On Linux thread priorities are ignored "\ 1886 " because the OS does not support static priority in "\ 1887 " SCHED_OTHER scheduling class which is the only choice for "\ 1888 " non-root, non-realtime applications. "\ 1889 "1 : Aggressive. "\ 1890 " Java thread priorities map over to the entire range of "\ 1891 " native thread priorities. Higher Java thread priorities map "\ 1892 " to higher native thread priorities. This policy should be "\ 1893 " used with care, as sometimes it can cause performance "\ 1894 " degradation in the application and/or the entire system. On "\ 1895 " Linux/BSD/macOS this policy requires root privilege or an "\ 1896 " extended capability.") \ 1897 range(0, 1) \ 1898 \ 1899 product(bool, ThreadPriorityVerbose, false, \ 1900 "Print priority changes") \ 1901 \ 1902 product(intx, CompilerThreadPriority, -1, \ 1903 "The native priority at which compiler threads should run " \ 1904 "(-1 means no change)") \ 1905 range(min_jint, max_jint) \ 1906 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1907 \ 1908 product(intx, VMThreadPriority, -1, \ 1909 "The native priority at which the VM thread should run " \ 1910 "(-1 means no change)") \ 1911 range(-1, 127) \ 1912 \ 1913 product(intx, JavaPriority1_To_OSPriority, -1, \ 1914 "Map Java priorities to OS priorities") \ 1915 range(-1, 127) \ 1916 \ 1917 product(intx, JavaPriority2_To_OSPriority, -1, \ 1918 "Map Java priorities to OS priorities") \ 1919 range(-1, 127) \ 1920 \ 1921 product(intx, JavaPriority3_To_OSPriority, -1, \ 1922 "Map Java priorities to OS priorities") \ 1923 range(-1, 127) \ 1924 \ 1925 product(intx, JavaPriority4_To_OSPriority, -1, \ 1926 "Map Java priorities to OS priorities") \ 1927 range(-1, 127) \ 1928 \ 1929 product(intx, JavaPriority5_To_OSPriority, -1, \ 1930 "Map Java priorities to OS priorities") \ 1931 range(-1, 127) \ 1932 \ 1933 product(intx, JavaPriority6_To_OSPriority, -1, \ 1934 "Map Java priorities to OS priorities") \ 1935 range(-1, 127) \ 1936 \ 1937 product(intx, JavaPriority7_To_OSPriority, -1, \ 1938 "Map Java priorities to OS priorities") \ 1939 range(-1, 127) \ 1940 \ 1941 product(intx, JavaPriority8_To_OSPriority, -1, \ 1942 "Map Java priorities to OS priorities") \ 1943 range(-1, 127) \ 1944 \ 1945 product(intx, JavaPriority9_To_OSPriority, -1, \ 1946 "Map Java priorities to OS priorities") \ 1947 range(-1, 127) \ 1948 \ 1949 product(intx, JavaPriority10_To_OSPriority,-1, \ 1950 "Map Java priorities to OS priorities") \ 1951 range(-1, 127) \ 1952 \ 1953 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1954 "Java thread priority 10 maps to critical scheduling priority") \ 1955 \ 1956 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1957 "Compiler thread(s) run at critical scheduling priority") \ 1958 \ 1959 experimental(bool, UseCriticalCMSThreadPriority, false, \ 1960 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 1961 \ 1962 develop(intx, NewCodeParameter, 0, \ 1963 "Testing Only: Create a dedicated integer parameter before " \ 1964 "putback") \ 1965 \ 1966 /* new oopmap storage allocation */ \ 1967 develop(intx, MinOopMapAllocation, 8, \ 1968 "Minimum number of OopMap entries in an OopMapSet") \ 1969 \ 1970 /* Background Compilation */ \ 1971 develop(intx, LongCompileThreshold, 50, \ 1972 "Used with +TraceLongCompiles") \ 1973 \ 1974 /* recompilation */ \ 1975 product_pd(intx, CompileThreshold, \ 1976 "number of interpreted method invocations before (re-)compiling") \ 1977 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1978 \ 1979 product(double, CompileThresholdScaling, 1.0, \ 1980 "Factor to control when first compilation happens " \ 1981 "(both with and without tiered compilation): " \ 1982 "values greater than 1.0 delay counter overflow, " \ 1983 "values between 0 and 1.0 rush counter overflow, " \ 1984 "value of 1.0 leaves compilation thresholds unchanged " \ 1985 "value of 0.0 is equivalent to -Xint. " \ 1986 "" \ 1987 "Flag can be set as per-method option. " \ 1988 "If a value is specified for a method, compilation thresholds " \ 1989 "for that method are scaled by both the value of the global flag "\ 1990 "and the value of the per-method flag.") \ 1991 range(0.0, DBL_MAX) \ 1992 \ 1993 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1994 "Interpreter (tier 0) invocation notification frequency") \ 1995 range(0, 30) \ 1996 \ 1997 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1998 "C1 without MDO (tier 2) invocation notification frequency") \ 1999 range(0, 30) \ 2000 \ 2001 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 2002 "C1 with MDO profiling (tier 3) invocation notification " \ 2003 "frequency") \ 2004 range(0, 30) \ 2005 \ 2006 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 2007 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 2008 range(0, 30) \ 2009 \ 2010 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 2011 "Interpreter (tier 0) invocation notification frequency") \ 2012 range(0, 30) \ 2013 \ 2014 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 2015 "C1 without MDO (tier 2) invocation notification frequency") \ 2016 range(0, 30) \ 2017 \ 2018 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 2019 "C1 with MDO profiling (tier 3) invocation notification " \ 2020 "frequency") \ 2021 range(0, 30) \ 2022 \ 2023 product(intx, Tier2CompileThreshold, 0, \ 2024 "threshold at which tier 2 compilation is invoked") \ 2025 range(0, max_jint) \ 2026 \ 2027 product(intx, Tier2BackEdgeThreshold, 0, \ 2028 "Back edge threshold at which tier 2 compilation is invoked") \ 2029 range(0, max_jint) \ 2030 \ 2031 product(intx, Tier3InvocationThreshold, 200, \ 2032 "Compile if number of method invocations crosses this " \ 2033 "threshold") \ 2034 range(0, max_jint) \ 2035 \ 2036 product(intx, Tier3MinInvocationThreshold, 100, \ 2037 "Minimum invocation to compile at tier 3") \ 2038 range(0, max_jint) \ 2039 \ 2040 product(intx, Tier3CompileThreshold, 2000, \ 2041 "Threshold at which tier 3 compilation is invoked (invocation " \ 2042 "minimum must be satisfied)") \ 2043 range(0, max_jint) \ 2044 \ 2045 product(intx, Tier3BackEdgeThreshold, 60000, \ 2046 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2047 range(0, max_jint) \ 2048 \ 2049 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2050 "Compile if number of method invocations crosses this " \ 2051 "threshold if coming from AOT") \ 2052 range(0, max_jint) \ 2053 \ 2054 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2055 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2056 range(0, max_jint) \ 2057 \ 2058 product(intx, Tier3AOTCompileThreshold, 15000, \ 2059 "Threshold at which tier 3 compilation is invoked (invocation " \ 2060 "minimum must be satisfied) if coming from AOT") \ 2061 range(0, max_jint) \ 2062 \ 2063 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2064 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2065 "if coming from AOT") \ 2066 range(0, max_jint) \ 2067 \ 2068 product(intx, Tier4InvocationThreshold, 5000, \ 2069 "Compile if number of method invocations crosses this " \ 2070 "threshold") \ 2071 range(0, max_jint) \ 2072 \ 2073 product(intx, Tier4MinInvocationThreshold, 600, \ 2074 "Minimum invocation to compile at tier 4") \ 2075 range(0, max_jint) \ 2076 \ 2077 product(intx, Tier4CompileThreshold, 15000, \ 2078 "Threshold at which tier 4 compilation is invoked (invocation " \ 2079 "minimum must be satisfied") \ 2080 range(0, max_jint) \ 2081 \ 2082 product(intx, Tier4BackEdgeThreshold, 40000, \ 2083 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2084 range(0, max_jint) \ 2085 \ 2086 product(intx, Tier3DelayOn, 5, \ 2087 "If C2 queue size grows over this amount per compiler thread " \ 2088 "stop compiling at tier 3 and start compiling at tier 2") \ 2089 range(0, max_jint) \ 2090 \ 2091 product(intx, Tier3DelayOff, 2, \ 2092 "If C2 queue size is less than this amount per compiler thread " \ 2093 "allow methods compiled at tier 2 transition to tier 3") \ 2094 range(0, max_jint) \ 2095 \ 2096 product(intx, Tier3LoadFeedback, 5, \ 2097 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2098 "reaches this amount per compiler thread") \ 2099 range(0, max_jint) \ 2100 \ 2101 product(intx, Tier4LoadFeedback, 3, \ 2102 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2103 "reaches this amount per compiler thread") \ 2104 range(0, max_jint) \ 2105 \ 2106 product(intx, TieredCompileTaskTimeout, 50, \ 2107 "Kill compile task if method was not used within " \ 2108 "given timeout in milliseconds") \ 2109 range(0, max_intx) \ 2110 \ 2111 product(intx, TieredStopAtLevel, 4, \ 2112 "Stop at given compilation level") \ 2113 range(0, 4) \ 2114 \ 2115 product(intx, Tier0ProfilingStartPercentage, 200, \ 2116 "Start profiling in interpreter if the counters exceed tier 3 " \ 2117 "thresholds by the specified percentage") \ 2118 range(0, max_jint) \ 2119 \ 2120 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2121 "Increase the compile threshold for C1 compilation if the code " \ 2122 "cache is filled by the specified percentage") \ 2123 range(0, 99) \ 2124 \ 2125 product(intx, TieredRateUpdateMinTime, 1, \ 2126 "Minimum rate sampling interval (in milliseconds)") \ 2127 range(0, max_intx) \ 2128 \ 2129 product(intx, TieredRateUpdateMaxTime, 25, \ 2130 "Maximum rate sampling interval (in milliseconds)") \ 2131 range(0, max_intx) \ 2132 \ 2133 product_pd(bool, TieredCompilation, \ 2134 "Enable tiered compilation") \ 2135 \ 2136 product(bool, PrintTieredEvents, false, \ 2137 "Print tiered events notifications") \ 2138 \ 2139 product_pd(intx, OnStackReplacePercentage, \ 2140 "NON_TIERED number of method invocations/branches (expressed as " \ 2141 "% of CompileThreshold) before (re-)compiling OSR code") \ 2142 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2143 \ 2144 product(intx, InterpreterProfilePercentage, 33, \ 2145 "NON_TIERED number of method invocations/branches (expressed as " \ 2146 "% of CompileThreshold) before profiling in the interpreter") \ 2147 range(0, 100) \ 2148 \ 2149 develop(intx, MaxRecompilationSearchLength, 10, \ 2150 "The maximum number of frames to inspect when searching for " \ 2151 "recompilee") \ 2152 \ 2153 develop(intx, MaxInterpretedSearchLength, 3, \ 2154 "The maximum number of interpreted frames to skip when searching "\ 2155 "for recompilee") \ 2156 \ 2157 develop(intx, DesiredMethodLimit, 8000, \ 2158 "The desired maximum method size (in bytecodes) after inlining") \ 2159 \ 2160 develop(intx, HugeMethodLimit, 8000, \ 2161 "Don't compile methods larger than this if " \ 2162 "+DontCompileHugeMethods") \ 2163 \ 2164 /* Properties for Java libraries */ \ 2165 \ 2166 product(uint64_t, MaxDirectMemorySize, 0, \ 2167 "Maximum total size of NIO direct-buffer allocations") \ 2168 range(0, max_jlong) \ 2169 \ 2170 /* Flags used for temporary code during development */ \ 2171 \ 2172 diagnostic(bool, UseNewCode, false, \ 2173 "Testing Only: Use the new version while testing") \ 2174 \ 2175 diagnostic(bool, UseNewCode2, false, \ 2176 "Testing Only: Use the new version while testing") \ 2177 \ 2178 diagnostic(bool, UseNewCode3, false, \ 2179 "Testing Only: Use the new version while testing") \ 2180 \ 2181 /* flags for performance data collection */ \ 2182 \ 2183 product(bool, UsePerfData, true, \ 2184 "Flag to disable jvmstat instrumentation for performance testing "\ 2185 "and problem isolation purposes") \ 2186 \ 2187 product(bool, PerfDataSaveToFile, false, \ 2188 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2189 \ 2190 product(ccstr, PerfDataSaveFile, NULL, \ 2191 "Save PerfData memory to the specified absolute pathname. " \ 2192 "The string %p in the file name (if present) " \ 2193 "will be replaced by pid") \ 2194 \ 2195 product(intx, PerfDataSamplingInterval, 50, \ 2196 "Data sampling interval (in milliseconds)") \ 2197 range(PeriodicTask::min_interval, max_jint) \ 2198 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2199 \ 2200 product(bool, PerfDisableSharedMem, false, \ 2201 "Store performance data in standard memory") \ 2202 \ 2203 product(intx, PerfDataMemorySize, 32*K, \ 2204 "Size of performance data memory region. Will be rounded " \ 2205 "up to a multiple of the native os page size.") \ 2206 range(128, 32*64*K) \ 2207 \ 2208 product(intx, PerfMaxStringConstLength, 1024, \ 2209 "Maximum PerfStringConstant string length before truncation") \ 2210 range(32, 32*K) \ 2211 \ 2212 product(bool, PerfAllowAtExitRegistration, false, \ 2213 "Allow registration of atexit() methods") \ 2214 \ 2215 product(bool, PerfBypassFileSystemCheck, false, \ 2216 "Bypass Win32 file system criteria checks (Windows Only)") \ 2217 \ 2218 product(intx, UnguardOnExecutionViolation, 0, \ 2219 "Unguard page and retry on no-execute fault (Win32 only) " \ 2220 "0=off, 1=conservative, 2=aggressive") \ 2221 range(0, 2) \ 2222 \ 2223 /* Serviceability Support */ \ 2224 \ 2225 product(bool, ManagementServer, false, \ 2226 "Create JMX Management Server") \ 2227 \ 2228 product(bool, DisableAttachMechanism, false, \ 2229 "Disable mechanism that allows tools to attach to this VM") \ 2230 \ 2231 product(bool, StartAttachListener, false, \ 2232 "Always start Attach Listener at VM startup") \ 2233 \ 2234 product(bool, EnableDynamicAgentLoading, true, \ 2235 "Allow tools to load agents with the attach mechanism") \ 2236 \ 2237 manageable(bool, PrintConcurrentLocks, false, \ 2238 "Print java.util.concurrent locks in thread dump") \ 2239 \ 2240 /* Shared spaces */ \ 2241 \ 2242 product(bool, UseSharedSpaces, true, \ 2243 "Use shared spaces for metadata") \ 2244 \ 2245 product(bool, VerifySharedSpaces, false, \ 2246 "Verify integrity of shared spaces") \ 2247 \ 2248 product(bool, RequireSharedSpaces, false, \ 2249 "Require shared spaces for metadata") \ 2250 \ 2251 product(bool, DumpSharedSpaces, false, \ 2252 "Special mode: JVM reads a class list, loads classes, builds " \ 2253 "shared spaces, and dumps the shared spaces to a file to be " \ 2254 "used in future JVM runs") \ 2255 \ 2256 product(bool, DynamicDumpSharedSpaces, false, \ 2257 "Dynamic archive") \ 2258 \ 2259 product(bool, PrintSharedArchiveAndExit, false, \ 2260 "Print shared archive file contents") \ 2261 \ 2262 product(bool, PrintSharedDictionary, false, \ 2263 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2264 "dictionary") \ 2265 \ 2266 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2267 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2268 "Address to allocate shared memory region for class data") \ 2269 range(0, SIZE_MAX) \ 2270 \ 2271 product(ccstr, SharedArchiveConfigFile, NULL, \ 2272 "Data to add to the CDS archive file") \ 2273 \ 2274 product(uintx, SharedSymbolTableBucketSize, 4, \ 2275 "Average number of symbols per bucket in shared table") \ 2276 range(2, 246) \ 2277 \ 2278 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2279 "Allow Java agent to be run with CDS dumping") \ 2280 \ 2281 diagnostic(bool, PrintMethodHandleStubs, false, \ 2282 "Print generated stub code for method handles") \ 2283 \ 2284 develop(bool, TraceMethodHandles, false, \ 2285 "trace internal method handle operations") \ 2286 \ 2287 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2288 "perform extra checks when constructing method handles") \ 2289 \ 2290 diagnostic(bool, ShowHiddenFrames, false, \ 2291 "show method handle implementation frames (usually hidden)") \ 2292 \ 2293 experimental(bool, TrustFinalNonStaticFields, false, \ 2294 "trust final non-static declarations for constant folding") \ 2295 \ 2296 diagnostic(bool, FoldStableValues, true, \ 2297 "Optimize loads from stable fields (marked w/ @Stable)") \ 2298 \ 2299 develop(bool, TraceInvokeDynamic, false, \ 2300 "trace internal invoke dynamic operations") \ 2301 \ 2302 diagnostic(int, UseBootstrapCallInfo, 1, \ 2303 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2304 "resolved before the bootstrap method is called; 1: when a BSM " \ 2305 "that may accept a BootstrapCallInfo is detected, use that API " \ 2306 "to pass BSM arguments, which allows the BSM to delay their " \ 2307 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2308 "via that API, instead of with the eagerly-resolved array.") \ 2309 \ 2310 diagnostic(bool, PauseAtStartup, false, \ 2311 "Causes the VM to pause at startup time and wait for the pause " \ 2312 "file to be removed (default: ./vm.paused.<pid>)") \ 2313 \ 2314 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2315 "The file to create and for whose removal to await when pausing " \ 2316 "at startup. (default: ./vm.paused.<pid>)") \ 2317 \ 2318 diagnostic(bool, PauseAtExit, false, \ 2319 "Pause and wait for keypress on exit if a debugger is attached") \ 2320 \ 2321 product(bool, ExtendedDTraceProbes, false, \ 2322 "Enable performance-impacting dtrace probes") \ 2323 \ 2324 product(bool, DTraceMethodProbes, false, \ 2325 "Enable dtrace probes for method-entry and method-exit") \ 2326 \ 2327 product(bool, DTraceAllocProbes, false, \ 2328 "Enable dtrace probes for object allocation") \ 2329 \ 2330 product(bool, DTraceMonitorProbes, false, \ 2331 "Enable dtrace probes for monitor events") \ 2332 \ 2333 product(bool, RelaxAccessControlCheck, false, \ 2334 "Relax the access control checks in the verifier") \ 2335 \ 2336 product(uintx, StringTableSize, defaultStringTableSize, \ 2337 "Number of buckets in the interned String table " \ 2338 "(will be rounded to nearest higher power of 2)") \ 2339 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2340 \ 2341 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2342 "Number of buckets in the JVM internal Symbol table") \ 2343 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2344 \ 2345 product(bool, UseStringDeduplication, false, \ 2346 "Use string deduplication") \ 2347 \ 2348 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2349 "A string must reach this age (or be promoted to an old region) " \ 2350 "to be considered for deduplication") \ 2351 range(1, markOopDesc::max_age) \ 2352 \ 2353 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2354 "Force table resize every time the table is scanned") \ 2355 \ 2356 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2357 "Force table rehash every time the table is scanned") \ 2358 \ 2359 diagnostic(bool, WhiteBoxAPI, false, \ 2360 "Enable internal testing APIs") \ 2361 \ 2362 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2363 "Default survivor space alignment in bytes") \ 2364 range(8, 256) \ 2365 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2366 \ 2367 product(ccstr, DumpLoadedClassList, NULL, \ 2368 "Dump the names all loaded classes, that could be stored into " \ 2369 "the CDS archive, in the specified file") \ 2370 \ 2371 product(ccstr, SharedClassListFile, NULL, \ 2372 "Override the default CDS class list") \ 2373 \ 2374 product(ccstr, SharedArchiveFile, NULL, \ 2375 "Override the default location of the CDS archive file") \ 2376 \ 2377 product(ccstr, ArchiveClassesAtExit, NULL, \ 2378 "The path and name of the dynamic archive file") \ 2379 \ 2380 product(ccstr, ExtraSharedClassListFile, NULL, \ 2381 "Extra classlist for building the CDS archive file") \ 2382 \ 2383 experimental(size_t, ArrayAllocatorMallocLimit, \ 2384 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2385 "Allocation less than this value will be allocated " \ 2386 "using malloc. Larger allocations will use mmap.") \ 2387 \ 2388 experimental(bool, AlwaysAtomicAccesses, false, \ 2389 "Accesses to all variables should always be atomic") \ 2390 \ 2391 diagnostic(bool, UseUnalignedAccesses, false, \ 2392 "Use unaligned memory accesses in Unsafe") \ 2393 \ 2394 product_pd(bool, PreserveFramePointer, \ 2395 "Use the FP register for holding the frame pointer " \ 2396 "and not as a general purpose register.") \ 2397 \ 2398 diagnostic(bool, CheckIntrinsics, true, \ 2399 "When a class C is loaded, check that " \ 2400 "(1) all intrinsics defined by the VM for class C are present "\ 2401 "in the loaded class file and are marked with the " \ 2402 "@HotSpotIntrinsicCandidate annotation, that " \ 2403 "(2) there is an intrinsic registered for all loaded methods " \ 2404 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2405 "annotation, and that " \ 2406 "(3) no orphan methods exist for class C (i.e., methods for " \ 2407 "which the VM declares an intrinsic but that are not declared "\ 2408 "in the loaded class C. " \ 2409 "Check (3) is available only in debug builds.") \ 2410 \ 2411 diagnostic_pd(intx, InitArrayShortSize, \ 2412 "Threshold small size (in bytes) for clearing arrays. " \ 2413 "Anything this size or smaller may get converted to discrete " \ 2414 "scalar stores.") \ 2415 range(0, max_intx) \ 2416 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2417 \ 2418 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2419 "Disable backwards compatibility for compile commands.") \ 2420 \ 2421 diagnostic(bool, CompilerDirectivesPrint, false, \ 2422 "Print compiler directives on installation.") \ 2423 diagnostic(int, CompilerDirectivesLimit, 50, \ 2424 "Limit on number of compiler directives.") \ 2425 \ 2426 product(ccstr, AllocateHeapAt, NULL, \ 2427 "Path to the directoy where a temporary file will be created " \ 2428 "to use as the backing store for Java Heap.") \ 2429 \ 2430 experimental(ccstr, AllocateOldGenAt, NULL, \ 2431 "Path to the directoy where a temporary file will be " \ 2432 "created to use as the backing store for old generation." \ 2433 "File of size Xmx is pre-allocated for performance reason, so" \ 2434 "we need that much space available") \ 2435 \ 2436 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2437 "Run periodic metaspace verifications (0 - none, " \ 2438 "1 - always, >1 every nth interval)") \ 2439 \ 2440 diagnostic(bool, ShowRegistersOnAssert, true, \ 2441 "On internal errors, include registers in error report.") \ 2442 \ 2443 experimental(bool, UseSwitchProfiling, true, \ 2444 "leverage profiling for table/lookup switch") \ 2445 \ 2446 JFR_ONLY(product(bool, FlightRecorder, false, \ 2447 "(Deprecated) Enable Flight Recorder")) \ 2448 \ 2449 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2450 "Flight Recorder options")) \ 2451 \ 2452 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2453 "Start flight recording with options")) \ 2454 \ 2455 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2456 "Use platform unstable time where supported for timestamps only") 2457 2458 // Interface macros 2459 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2460 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2461 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2462 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2463 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2464 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2465 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2466 #ifdef PRODUCT 2467 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2468 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2469 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2470 #else 2471 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2472 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2473 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2474 #endif // PRODUCT 2475 // Special LP64 flags, product only needed for now. 2476 #ifdef _LP64 2477 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2478 #else 2479 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2480 #endif // _LP64 2481 2482 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2483 DECLARE_PD_DEVELOPER_FLAG, \ 2484 DECLARE_PRODUCT_FLAG, \ 2485 DECLARE_PD_PRODUCT_FLAG, \ 2486 DECLARE_DIAGNOSTIC_FLAG, \ 2487 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2488 DECLARE_EXPERIMENTAL_FLAG, \ 2489 DECLARE_NOTPRODUCT_FLAG, \ 2490 DECLARE_MANAGEABLE_FLAG, \ 2491 DECLARE_PRODUCT_RW_FLAG, \ 2492 DECLARE_LP64_PRODUCT_FLAG, \ 2493 IGNORE_RANGE, \ 2494 IGNORE_CONSTRAINT, \ 2495 IGNORE_WRITEABLE) 2496 2497 // Extensions 2498 2499 #include "runtime/globals_ext.hpp" 2500 2501 #endif // SHARE_RUNTIME_GLOBALS_HPP