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 diagnostic(uint, HandshakeTimeout, 0, \ 167 "If nonzero set a timeout in milliseconds for handshakes") \ 168 \ 169 experimental(bool, AlwaysSafeConstructors, false, \ 170 "Force safe construction, as if all fields are final.") \ 171 \ 172 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 173 "Enable normal processing of flags relating to field diagnostics")\ 174 \ 175 experimental(bool, UnlockExperimentalVMOptions, false, \ 176 "Enable normal processing of flags relating to experimental " \ 177 "features") \ 178 \ 179 product(bool, JavaMonitorsInStackTrace, true, \ 180 "Print information about Java monitor locks when the stacks are" \ 181 "dumped") \ 182 \ 183 product_pd(bool, UseLargePages, \ 184 "Use large page memory") \ 185 \ 186 product_pd(bool, UseLargePagesIndividualAllocation, \ 187 "Allocate large pages individually for better affinity") \ 188 \ 189 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 190 "Fail large pages individual allocation") \ 191 \ 192 product(bool, UseLargePagesInMetaspace, false, \ 193 "Use large page memory in metaspace. " \ 194 "Only used if UseLargePages is enabled.") \ 195 \ 196 product(bool, UseNUMA, false, \ 197 "Use NUMA if available") \ 198 \ 199 product(bool, UseNUMAInterleaving, false, \ 200 "Interleave memory across NUMA nodes if available") \ 201 \ 202 product(size_t, NUMAInterleaveGranularity, 2*M, \ 203 "Granularity to use for NUMA interleaving on Windows OS") \ 204 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 205 \ 206 product(bool, ForceNUMA, false, \ 207 "Force NUMA optimizations on single-node/UMA systems") \ 208 \ 209 product(uintx, NUMAChunkResizeWeight, 20, \ 210 "Percentage (0-100) used to weight the current sample when " \ 211 "computing exponentially decaying average for " \ 212 "AdaptiveNUMAChunkSizing") \ 213 range(0, 100) \ 214 \ 215 product(size_t, NUMASpaceResizeRate, 1*G, \ 216 "Do not reallocate more than this amount per collection") \ 217 range(0, max_uintx) \ 218 \ 219 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 220 "Enable adaptive chunk sizing for NUMA") \ 221 \ 222 product(bool, NUMAStats, false, \ 223 "Print NUMA stats in detailed heap information") \ 224 \ 225 product(uintx, NUMAPageScanRate, 256, \ 226 "Maximum number of pages to include in the page scan procedure") \ 227 range(0, max_uintx) \ 228 \ 229 product(intx, UseSSE, 99, \ 230 "Highest supported SSE instructions set on x86/x64") \ 231 range(0, 99) \ 232 \ 233 product(bool, UseAES, false, \ 234 "Control whether AES instructions are used when available") \ 235 \ 236 product(bool, UseFMA, false, \ 237 "Control whether FMA instructions are used when available") \ 238 \ 239 product(bool, UseSHA, false, \ 240 "Control whether SHA instructions are used when available") \ 241 \ 242 diagnostic(bool, UseGHASHIntrinsics, false, \ 243 "Use intrinsics for GHASH versions of crypto") \ 244 \ 245 product(bool, UseBASE64Intrinsics, false, \ 246 "Use intrinsics for java.util.Base64") \ 247 \ 248 product(size_t, LargePageSizeInBytes, 0, \ 249 "Large page size (0 to let VM choose the page size)") \ 250 range(0, max_uintx) \ 251 \ 252 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 253 "Use large pages if maximum heap is at least this big") \ 254 range(0, max_uintx) \ 255 \ 256 product(bool, ForceTimeHighResolution, false, \ 257 "Using high time resolution (for Win32 only)") \ 258 \ 259 develop(bool, TracePcPatching, false, \ 260 "Trace usage of frame::patch_pc") \ 261 \ 262 develop(bool, TraceRelocator, false, \ 263 "Trace the bytecode relocator") \ 264 \ 265 develop(bool, TraceLongCompiles, false, \ 266 "Print out every time compilation is longer than " \ 267 "a given threshold") \ 268 \ 269 diagnostic(bool, SafepointALot, false, \ 270 "Generate a lot of safepoints. This works with " \ 271 "GuaranteedSafepointInterval") \ 272 \ 273 diagnostic(bool, HandshakeALot, false, \ 274 "Generate a lot of handshakes. This works with " \ 275 "GuaranteedSafepointInterval") \ 276 \ 277 product_pd(bool, BackgroundCompilation, \ 278 "A thread requesting compilation is not blocked during " \ 279 "compilation") \ 280 \ 281 product(bool, PrintVMQWaitTime, false, \ 282 "Print out the waiting time in VM operation queue") \ 283 \ 284 product(bool, MethodFlushing, true, \ 285 "Reclamation of zombie and not-entrant methods") \ 286 \ 287 develop(bool, VerifyStack, false, \ 288 "Verify stack of each thread when it is entering a runtime call") \ 289 \ 290 diagnostic(bool, ForceUnreachable, false, \ 291 "Make all non code cache addresses to be unreachable by " \ 292 "forcing use of 64bit literal fixups") \ 293 \ 294 notproduct(bool, StressDerivedPointers, false, \ 295 "Force scavenge when a derived pointer is detected on stack " \ 296 "after rtm call") \ 297 \ 298 develop(bool, TraceDerivedPointers, false, \ 299 "Trace traversal of derived pointers on stack") \ 300 \ 301 notproduct(bool, TraceCodeBlobStacks, false, \ 302 "Trace stack-walk of codeblobs") \ 303 \ 304 notproduct(bool, PrintRewrites, false, \ 305 "Print methods that are being rewritten") \ 306 \ 307 product(bool, UseInlineCaches, true, \ 308 "Use Inline Caches for virtual calls ") \ 309 \ 310 diagnostic(bool, InlineArrayCopy, true, \ 311 "Inline arraycopy native that is known to be part of " \ 312 "base library DLL") \ 313 \ 314 diagnostic(bool, InlineObjectHash, true, \ 315 "Inline Object::hashCode() native that is known to be part " \ 316 "of base library DLL") \ 317 \ 318 diagnostic(bool, InlineNatives, true, \ 319 "Inline natives that are known to be part of base library DLL") \ 320 \ 321 diagnostic(bool, InlineMathNatives, true, \ 322 "Inline SinD, CosD, etc.") \ 323 \ 324 diagnostic(bool, InlineClassNatives, true, \ 325 "Inline Class.isInstance, etc") \ 326 \ 327 diagnostic(bool, InlineThreadNatives, true, \ 328 "Inline Thread.currentThread, etc") \ 329 \ 330 diagnostic(bool, InlineUnsafeOps, true, \ 331 "Inline memory ops (native methods) from Unsafe") \ 332 \ 333 product(bool, CriticalJNINatives, true, \ 334 "Check for critical JNI entry points") \ 335 \ 336 notproduct(bool, StressCriticalJNINatives, false, \ 337 "Exercise register saving code in critical natives") \ 338 \ 339 diagnostic(bool, UseAESIntrinsics, false, \ 340 "Use intrinsics for AES versions of crypto") \ 341 \ 342 diagnostic(bool, UseAESCTRIntrinsics, false, \ 343 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 344 \ 345 diagnostic(bool, UseSHA1Intrinsics, false, \ 346 "Use intrinsics for SHA-1 crypto hash function. " \ 347 "Requires that UseSHA is enabled.") \ 348 \ 349 diagnostic(bool, UseSHA256Intrinsics, false, \ 350 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 351 "Requires that UseSHA is enabled.") \ 352 \ 353 diagnostic(bool, UseSHA512Intrinsics, false, \ 354 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 355 "Requires that UseSHA is enabled.") \ 356 \ 357 diagnostic(bool, UseCRC32Intrinsics, false, \ 358 "use intrinsics for java.util.zip.CRC32") \ 359 \ 360 diagnostic(bool, UseCRC32CIntrinsics, false, \ 361 "use intrinsics for java.util.zip.CRC32C") \ 362 \ 363 diagnostic(bool, UseAdler32Intrinsics, false, \ 364 "use intrinsics for java.util.zip.Adler32") \ 365 \ 366 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 367 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 368 \ 369 diagnostic(ccstrlist, DisableIntrinsic, "", \ 370 "do not expand intrinsics whose (internal) names appear here") \ 371 \ 372 develop(bool, TraceCallFixup, false, \ 373 "Trace all call fixups") \ 374 \ 375 develop(bool, DeoptimizeALot, false, \ 376 "Deoptimize at every exit from the runtime system") \ 377 \ 378 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 379 "A comma separated list of bcis to deoptimize at") \ 380 \ 381 develop(bool, DeoptimizeRandom, false, \ 382 "Deoptimize random frames on random exit from the runtime system")\ 383 \ 384 notproduct(bool, ZombieALot, false, \ 385 "Create zombies (non-entrant) at exit from the runtime system") \ 386 \ 387 notproduct(bool, WalkStackALot, false, \ 388 "Trace stack (no print) at every exit from the runtime system") \ 389 \ 390 product(bool, Debugging, false, \ 391 "Set when executing debug methods in debug.cpp " \ 392 "(to prevent triggering assertions)") \ 393 \ 394 notproduct(bool, VerifyLastFrame, false, \ 395 "Verify oops on last frame on entry to VM") \ 396 \ 397 product(bool, SafepointTimeout, false, \ 398 "Time out and warn or fail after SafepointTimeoutDelay " \ 399 "milliseconds if failed to reach safepoint") \ 400 \ 401 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 402 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 403 \ 404 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 405 "Abort upon failure to complete VM operation promptly") \ 406 \ 407 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 408 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 409 range(0, max_intx) \ 410 \ 411 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 412 /* typically, at most a few retries are needed */ \ 413 product(intx, SuspendRetryCount, 50, \ 414 "Maximum retry count for an external suspend request") \ 415 range(0, max_intx) \ 416 \ 417 product(intx, SuspendRetryDelay, 5, \ 418 "Milliseconds to delay per retry (* current_retry_count)") \ 419 range(0, max_intx) \ 420 \ 421 product(bool, AssertOnSuspendWaitFailure, false, \ 422 "Assert/Guarantee on external suspend wait failure") \ 423 \ 424 product(bool, TraceSuspendWaitFailures, false, \ 425 "Trace external suspend wait failures") \ 426 \ 427 product(bool, MaxFDLimit, true, \ 428 "Bump the number of file descriptors to maximum in Solaris") \ 429 \ 430 diagnostic(bool, LogEvents, true, \ 431 "Enable the various ring buffer event logs") \ 432 \ 433 diagnostic(uintx, LogEventsBufferEntries, 20, \ 434 "Number of ring buffer event logs") \ 435 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 436 \ 437 diagnostic(bool, BytecodeVerificationRemote, true, \ 438 "Enable the Java bytecode verifier for remote classes") \ 439 \ 440 diagnostic(bool, BytecodeVerificationLocal, false, \ 441 "Enable the Java bytecode verifier for local classes") \ 442 \ 443 develop(bool, ForceFloatExceptions, trueInDebug, \ 444 "Force exceptions on FP stack under/overflow") \ 445 \ 446 develop(bool, VerifyStackAtCalls, false, \ 447 "Verify that the stack pointer is unchanged after calls") \ 448 \ 449 develop(bool, TraceJavaAssertions, false, \ 450 "Trace java language assertions") \ 451 \ 452 notproduct(bool, VerifyCodeCache, false, \ 453 "Verify code cache on memory allocation/deallocation") \ 454 \ 455 develop(bool, UseMallocOnly, false, \ 456 "Use only malloc/free for allocation (no resource area/arena)") \ 457 \ 458 develop(bool, ZapResourceArea, trueInDebug, \ 459 "Zap freed resource/arena space with 0xABABABAB") \ 460 \ 461 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 462 "Zap freed VM handle space with 0xBCBCBCBC") \ 463 \ 464 notproduct(bool, ZapStackSegments, trueInDebug, \ 465 "Zap allocated/freed stack segments with 0xFADFADED") \ 466 \ 467 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 468 "Zap unused heap space with 0xBAADBABE") \ 469 \ 470 develop(bool, CheckZapUnusedHeapArea, false, \ 471 "Check zapping of unused heap space") \ 472 \ 473 develop(bool, ZapFillerObjects, trueInDebug, \ 474 "Zap filler objects with 0xDEAFBABE") \ 475 \ 476 develop(bool, PrintVMMessages, true, \ 477 "Print VM messages on console") \ 478 \ 479 notproduct(uintx, ErrorHandlerTest, 0, \ 480 "If > 0, provokes an error after VM initialization; the value " \ 481 "determines which error to provoke. See test_error_handler() " \ 482 "in vmError.cpp.") \ 483 \ 484 notproduct(uintx, TestCrashInErrorHandler, 0, \ 485 "If > 0, provokes an error inside VM error handler (a secondary " \ 486 "crash). see test_error_handler() in vmError.cpp") \ 487 \ 488 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 489 "If true, tests SafeFetch inside error handler.") \ 490 \ 491 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 492 "If true, simulates an unresponsive error handler.") \ 493 \ 494 develop(bool, Verbose, false, \ 495 "Print additional debugging information from other modes") \ 496 \ 497 develop(bool, PrintMiscellaneous, false, \ 498 "Print uncategorized debugging information (requires +Verbose)") \ 499 \ 500 develop(bool, WizardMode, false, \ 501 "Print much more debugging information") \ 502 \ 503 product(bool, ShowMessageBoxOnError, false, \ 504 "Keep process alive on VM fatal error") \ 505 \ 506 product(bool, CreateCoredumpOnCrash, true, \ 507 "Create core/mini dump on VM fatal error") \ 508 \ 509 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 510 "Timeout, in seconds, to limit the time spent on writing an " \ 511 "error log in case of a crash.") \ 512 range(0, (uint64_t)max_jlong/1000) \ 513 \ 514 product_pd(bool, UseOSErrorReporting, \ 515 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 516 \ 517 product(bool, SuppressFatalErrorMessage, false, \ 518 "Report NO fatal error message (avoid deadlock)") \ 519 \ 520 product(ccstrlist, OnError, "", \ 521 "Run user-defined commands on fatal error; see VMError.cpp " \ 522 "for examples") \ 523 \ 524 product(ccstrlist, OnOutOfMemoryError, "", \ 525 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 526 \ 527 manageable(bool, HeapDumpBeforeFullGC, false, \ 528 "Dump heap to file before any major stop-the-world GC") \ 529 \ 530 manageable(bool, HeapDumpAfterFullGC, false, \ 531 "Dump heap to file after any major stop-the-world GC") \ 532 \ 533 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 534 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 535 \ 536 manageable(ccstr, HeapDumpPath, NULL, \ 537 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 538 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 539 "in the working directory)") \ 540 \ 541 develop(bool, BreakAtWarning, false, \ 542 "Execute breakpoint upon encountering VM warning") \ 543 \ 544 product(ccstr, NativeMemoryTracking, "off", \ 545 "Native memory tracking options") \ 546 \ 547 diagnostic(bool, PrintNMTStatistics, false, \ 548 "Print native memory tracking summary data if it is on") \ 549 \ 550 diagnostic(bool, LogCompilation, false, \ 551 "Log compilation activity in detail to LogFile") \ 552 \ 553 product(bool, PrintCompilation, false, \ 554 "Print compilations") \ 555 \ 556 product(bool, PrintExtendedThreadInfo, false, \ 557 "Print more information in thread dump") \ 558 \ 559 diagnostic(intx, ScavengeRootsInCode, 2, \ 560 "0: do not allow scavengable oops in the code cache; " \ 561 "1: allow scavenging from the code cache; " \ 562 "2: emit as many constants as the compiler can see") \ 563 range(0, 2) \ 564 \ 565 product(bool, AlwaysRestoreFPU, false, \ 566 "Restore the FPU control word after every JNI call (expensive)") \ 567 \ 568 diagnostic(bool, PrintCompilation2, false, \ 569 "Print additional statistics per compilation") \ 570 \ 571 diagnostic(bool, PrintAdapterHandlers, false, \ 572 "Print code generated for i2c/c2i adapters") \ 573 \ 574 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 575 "Verify that i2c/c2i adapters are called properly") \ 576 \ 577 develop(bool, VerifyAdapterSharing, false, \ 578 "Verify that the code for shared adapters is the equivalent") \ 579 \ 580 diagnostic(bool, PrintAssembly, false, \ 581 "Print assembly code (using external disassembler.so)") \ 582 \ 583 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 584 "Print options string passed to disassembler.so") \ 585 \ 586 notproduct(bool, PrintNMethodStatistics, false, \ 587 "Print a summary statistic for the generated nmethods") \ 588 \ 589 diagnostic(bool, PrintNMethods, false, \ 590 "Print assembly code for nmethods when generated") \ 591 \ 592 diagnostic(bool, PrintNativeNMethods, false, \ 593 "Print assembly code for native nmethods when generated") \ 594 \ 595 develop(bool, PrintDebugInfo, false, \ 596 "Print debug information for all nmethods when generated") \ 597 \ 598 develop(bool, PrintRelocations, false, \ 599 "Print relocation information for all nmethods when generated") \ 600 \ 601 develop(bool, PrintDependencies, false, \ 602 "Print dependency information for all nmethods when generated") \ 603 \ 604 develop(bool, PrintExceptionHandlers, false, \ 605 "Print exception handler tables for all nmethods when generated") \ 606 \ 607 develop(bool, StressCompiledExceptionHandlers, false, \ 608 "Exercise compiled exception handlers") \ 609 \ 610 develop(bool, InterceptOSException, false, \ 611 "Start debugger when an implicit OS (e.g. NULL) " \ 612 "exception happens") \ 613 \ 614 product(bool, PrintCodeCache, false, \ 615 "Print the code cache memory usage when exiting") \ 616 \ 617 develop(bool, PrintCodeCache2, false, \ 618 "Print detailed usage information on the code cache when exiting")\ 619 \ 620 product(bool, PrintCodeCacheOnCompilation, false, \ 621 "Print the code cache memory usage each time a method is " \ 622 "compiled") \ 623 \ 624 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 625 "Print code heap usage statistics on exit and on full condition") \ 626 \ 627 diagnostic(bool, PrintStubCode, false, \ 628 "Print generated stub code") \ 629 \ 630 product(bool, StackTraceInThrowable, true, \ 631 "Collect backtrace in throwable when exception happens") \ 632 \ 633 product(bool, OmitStackTraceInFastThrow, true, \ 634 "Omit backtraces for some 'hot' exceptions in optimized code") \ 635 \ 636 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \ 637 "Show exception messages from RuntimeExceptions that contain " \ 638 "snippets of the failing code. Disable this to improve privacy.") \ 639 \ 640 product(bool, PrintWarnings, true, \ 641 "Print JVM warnings to output stream") \ 642 \ 643 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 644 "Print warnings for stalled SpinLocks") \ 645 \ 646 product(bool, RegisterFinalizersAtInit, true, \ 647 "Register finalizable objects at end of Object.<init> or " \ 648 "after allocation") \ 649 \ 650 develop(bool, RegisterReferences, true, \ 651 "Tell whether the VM should register soft/weak/final/phantom " \ 652 "references") \ 653 \ 654 develop(bool, IgnoreRewrites, false, \ 655 "Suppress rewrites of bytecodes in the oopmap generator. " \ 656 "This is unsafe!") \ 657 \ 658 develop(bool, PrintCodeCacheExtension, false, \ 659 "Print extension of code cache") \ 660 \ 661 develop(bool, UsePrivilegedStack, true, \ 662 "Enable the security JVM functions") \ 663 \ 664 develop(bool, ProtectionDomainVerification, true, \ 665 "Verify protection domain before resolution in system dictionary")\ 666 \ 667 product(bool, ClassUnloading, true, \ 668 "Do unloading of classes") \ 669 \ 670 product(bool, ClassUnloadingWithConcurrentMark, true, \ 671 "Do unloading of classes with a concurrent marking cycle") \ 672 \ 673 develop(bool, DisableStartThread, false, \ 674 "Disable starting of additional Java threads " \ 675 "(for debugging only)") \ 676 \ 677 develop(bool, MemProfiling, false, \ 678 "Write memory usage profiling to log file") \ 679 \ 680 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 681 "Print the system dictionary at exit") \ 682 \ 683 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 684 "Dynamically resize system dictionaries as needed") \ 685 \ 686 product(bool, AlwaysLockClassLoader, false, \ 687 "Require the VM to acquire the class loader lock before calling " \ 688 "loadClass() even for class loaders registering " \ 689 "as parallel capable") \ 690 \ 691 product(bool, AllowParallelDefineClass, false, \ 692 "Allow parallel defineClass requests for class loaders " \ 693 "registering as parallel capable") \ 694 \ 695 product_pd(bool, DontYieldALot, \ 696 "Throw away obvious excess yield calls") \ 697 \ 698 develop(bool, UseDetachedThreads, true, \ 699 "Use detached threads that are recycled upon termination " \ 700 "(for Solaris only)") \ 701 \ 702 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 703 "Disable the use of stack guard pages if the JVM is loaded " \ 704 "on the primordial process thread") \ 705 \ 706 product(bool, UseLWPSynchronization, true, \ 707 "Use LWP-based instead of libthread-based synchronization " \ 708 "(SPARC only)") \ 709 \ 710 product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population") \ 711 range(0, max_jint) \ 712 \ 713 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 714 "Percentage of used monitors before triggering cleanup " \ 715 "safepoint which deflates monitors (0 is off). " \ 716 "The check is performed on GuaranteedSafepointInterval.") \ 717 range(0, 100) \ 718 \ 719 experimental(intx, hashCode, 5, \ 720 "(Unstable) select hashCode generation algorithm") \ 721 \ 722 product(bool, FilterSpuriousWakeups, true, \ 723 "When true prevents OS-level spurious, or premature, wakeups " \ 724 "from Object.wait (Ignored for Windows)") \ 725 \ 726 develop(bool, UsePthreads, false, \ 727 "Use pthread-based instead of libthread-based synchronization " \ 728 "(SPARC only)") \ 729 \ 730 product(bool, ReduceSignalUsage, false, \ 731 "Reduce the use of OS signals in Java and/or the VM") \ 732 \ 733 develop(bool, LoadLineNumberTables, true, \ 734 "Tell whether the class file parser loads line number tables") \ 735 \ 736 develop(bool, LoadLocalVariableTables, true, \ 737 "Tell whether the class file parser loads local variable tables") \ 738 \ 739 develop(bool, LoadLocalVariableTypeTables, true, \ 740 "Tell whether the class file parser loads local variable type" \ 741 "tables") \ 742 \ 743 product(bool, AllowUserSignalHandlers, false, \ 744 "Do not complain if the application installs signal handlers " \ 745 "(Solaris & Linux only)") \ 746 \ 747 product(bool, UseSignalChaining, true, \ 748 "Use signal-chaining to invoke signal handlers installed " \ 749 "by the application (Solaris & Linux only)") \ 750 \ 751 product(bool, RestoreMXCSROnJNICalls, false, \ 752 "Restore MXCSR when returning from JNI calls") \ 753 \ 754 product(bool, CheckJNICalls, false, \ 755 "Verify all arguments to JNI calls") \ 756 \ 757 product(bool, UseFastJNIAccessors, true, \ 758 "Use optimized versions of Get<Primitive>Field") \ 759 \ 760 product(intx, MaxJNILocalCapacity, 65536, \ 761 "Maximum allowable local JNI handle capacity to " \ 762 "EnsureLocalCapacity() and PushLocalFrame(), " \ 763 "where <= 0 is unlimited, default: 65536") \ 764 range(min_intx, max_intx) \ 765 \ 766 product(bool, EagerXrunInit, false, \ 767 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 768 "but not all -Xrun libraries may support the state of the VM " \ 769 "at this time") \ 770 \ 771 product(bool, PreserveAllAnnotations, false, \ 772 "Preserve RuntimeInvisibleAnnotations as well " \ 773 "as RuntimeVisibleAnnotations") \ 774 \ 775 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 776 "Number of OutOfMemoryErrors preallocated with backtrace") \ 777 \ 778 product(bool, UseXMMForArrayCopy, false, \ 779 "Use SSE2 MOVQ instruction for Arraycopy") \ 780 \ 781 product(intx, FieldsAllocationStyle, 1, \ 782 "(Deprecated) 0 - type based with oops first, " \ 783 "1 - with oops last, " \ 784 "2 - oops in super and sub classes are together") \ 785 range(0, 2) \ 786 \ 787 product(bool, CompactFields, true, \ 788 "(Deprecated) Allocate nonstatic fields in gaps " \ 789 "between previous fields") \ 790 \ 791 notproduct(bool, PrintFieldLayout, false, \ 792 "Print field layout for each class") \ 793 \ 794 /* Need to limit the extent of the padding to reasonable size. */\ 795 /* 8K is well beyond the reasonable HW cache line size, even with */\ 796 /* aggressive prefetching, while still leaving the room for segregating */\ 797 /* among the distinct pages. */\ 798 product(intx, ContendedPaddingWidth, 128, \ 799 "How many bytes to pad the fields/classes marked @Contended with")\ 800 range(0, 8192) \ 801 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 802 \ 803 product(bool, EnableContended, true, \ 804 "Enable @Contended annotation support") \ 805 \ 806 product(bool, RestrictContended, true, \ 807 "Restrict @Contended to trusted classes") \ 808 \ 809 product(bool, UseBiasedLocking, true, \ 810 "Enable biased locking in JVM") \ 811 \ 812 product(intx, BiasedLockingStartupDelay, 0, \ 813 "Number of milliseconds to wait before enabling biased locking") \ 814 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 815 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 816 \ 817 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 818 "Print statistics of biased locking in JVM") \ 819 \ 820 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 821 "Threshold of number of revocations per type to try to " \ 822 "rebias all objects in the heap of that type") \ 823 range(0, max_intx) \ 824 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 825 \ 826 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 827 "Threshold of number of revocations per type to permanently " \ 828 "revoke biases of all objects in the heap of that type") \ 829 range(0, max_intx) \ 830 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 831 \ 832 product(intx, BiasedLockingDecayTime, 25000, \ 833 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 834 "type after previous bulk rebias") \ 835 range(500, max_intx) \ 836 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 837 \ 838 product(bool, ExitOnOutOfMemoryError, false, \ 839 "JVM exits on the first occurrence of an out-of-memory error") \ 840 \ 841 product(bool, CrashOnOutOfMemoryError, false, \ 842 "JVM aborts, producing an error log and core/mini dump, on the " \ 843 "first occurrence of an out-of-memory error") \ 844 \ 845 /* tracing */ \ 846 \ 847 develop(bool, StressRewriter, false, \ 848 "Stress linktime bytecode rewriting") \ 849 \ 850 product(ccstr, TraceJVMTI, NULL, \ 851 "Trace flags for JVMTI functions and events") \ 852 \ 853 /* This option can change an EMCP method into an obsolete method. */ \ 854 /* This can affect tests that except specific methods to be EMCP. */ \ 855 /* This option should be used with caution. */ \ 856 product(bool, StressLdcRewrite, false, \ 857 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 858 \ 859 /* change to false by default sometime after Mustang */ \ 860 product(bool, VerifyMergedCPBytecodes, true, \ 861 "Verify bytecodes after RedefineClasses constant pool merging") \ 862 \ 863 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 864 "(Deprecated) Allow redefinition to add and delete private " \ 865 "static or final methods for compatibility with old releases") \ 866 \ 867 develop(bool, TraceBytecodes, false, \ 868 "Trace bytecode execution") \ 869 \ 870 develop(bool, TraceICs, false, \ 871 "Trace inline cache changes") \ 872 \ 873 notproduct(bool, TraceInvocationCounterOverflow, false, \ 874 "Trace method invocation counter overflow") \ 875 \ 876 develop(bool, TraceInlineCacheClearing, false, \ 877 "Trace clearing of inline caches in nmethods") \ 878 \ 879 develop(bool, TraceDependencies, false, \ 880 "Trace dependencies") \ 881 \ 882 develop(bool, VerifyDependencies, trueInDebug, \ 883 "Exercise and verify the compilation dependency mechanism") \ 884 \ 885 develop(bool, TraceNewOopMapGeneration, false, \ 886 "Trace OopMapGeneration") \ 887 \ 888 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 889 "Trace OopMapGeneration: print detailed cell states") \ 890 \ 891 develop(bool, TimeOopMap, false, \ 892 "Time calls to GenerateOopMap::compute_map() in sum") \ 893 \ 894 develop(bool, TimeOopMap2, false, \ 895 "Time calls to GenerateOopMap::compute_map() individually") \ 896 \ 897 develop(bool, TraceOopMapRewrites, false, \ 898 "Trace rewriting of method oops during oop map generation") \ 899 \ 900 develop(bool, TraceICBuffer, false, \ 901 "Trace usage of IC buffer") \ 902 \ 903 develop(bool, TraceCompiledIC, false, \ 904 "Trace changes of compiled IC") \ 905 \ 906 develop(bool, FLSVerifyDictionary, false, \ 907 "Do lots of (expensive) FLS dictionary verification") \ 908 \ 909 \ 910 notproduct(bool, CheckMemoryInitialization, false, \ 911 "Check memory initialization") \ 912 \ 913 product(uintx, ProcessDistributionStride, 4, \ 914 "Stride through processors when distributing processes") \ 915 range(0, max_juint) \ 916 \ 917 develop(bool, TraceFinalizerRegistration, false, \ 918 "Trace registration of final references") \ 919 \ 920 product(bool, IgnoreEmptyClassPaths, false, \ 921 "Ignore empty path elements in -classpath") \ 922 \ 923 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 924 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 925 "Initial size of the boot class loader data metaspace") \ 926 range(30*K, max_uintx/BytesPerWord) \ 927 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 928 \ 929 product(bool, PrintHeapAtSIGBREAK, true, \ 930 "Print heap layout in response to SIGBREAK") \ 931 \ 932 manageable(bool, PrintClassHistogram, false, \ 933 "Print a histogram of class instances") \ 934 \ 935 experimental(double, ObjectCountCutOffPercent, 0.5, \ 936 "The percentage of the used heap that the instances of a class " \ 937 "must occupy for the class to generate a trace event") \ 938 range(0.0, 100.0) \ 939 \ 940 /* JVMTI heap profiling */ \ 941 \ 942 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 943 "Trace JVMTI object tagging calls") \ 944 \ 945 diagnostic(bool, VerifyBeforeIteration, false, \ 946 "Verify memory system before JVMTI iteration") \ 947 \ 948 /* compiler interface */ \ 949 \ 950 develop(bool, CIPrintCompilerName, false, \ 951 "when CIPrint is active, print the name of the active compiler") \ 952 \ 953 diagnostic(bool, CIPrintCompileQueue, false, \ 954 "display the contents of the compile queue whenever a " \ 955 "compilation is enqueued") \ 956 \ 957 develop(bool, CIPrintRequests, false, \ 958 "display every request for compilation") \ 959 \ 960 product(bool, CITime, false, \ 961 "collect timing information for compilation") \ 962 \ 963 develop(bool, CITimeVerbose, false, \ 964 "be more verbose in compilation timings") \ 965 \ 966 develop(bool, CITimeEach, false, \ 967 "display timing information after each successful compilation") \ 968 \ 969 develop(bool, CICountOSR, false, \ 970 "use a separate counter when assigning ids to osr compilations") \ 971 \ 972 develop(bool, CICompileNatives, true, \ 973 "compile native methods if supported by the compiler") \ 974 \ 975 develop_pd(bool, CICompileOSR, \ 976 "compile on stack replacement methods if supported by the " \ 977 "compiler") \ 978 \ 979 develop(bool, CIPrintMethodCodes, false, \ 980 "print method bytecodes of the compiled code") \ 981 \ 982 develop(bool, CIPrintTypeFlow, false, \ 983 "print the results of ciTypeFlow analysis") \ 984 \ 985 develop(bool, CITraceTypeFlow, false, \ 986 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 987 \ 988 develop(intx, OSROnlyBCI, -1, \ 989 "OSR only at this bci. Negative values mean exclude that bci") \ 990 \ 991 /* compiler */ \ 992 \ 993 /* notice: the max range value here is max_jint, not max_intx */ \ 994 /* because of overflow issue */ \ 995 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 996 "Number of compiler threads to run") \ 997 range(0, max_jint) \ 998 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 999 \ 1000 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 1001 "Dynamically choose the number of parallel compiler threads") \ 1002 \ 1003 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1004 "Reduce the number of parallel compiler threads when they " \ 1005 "are not used") \ 1006 \ 1007 diagnostic(bool, TraceCompilerThreads, false, \ 1008 "Trace creation and removal of compiler threads") \ 1009 \ 1010 develop(bool, InjectCompilerCreationFailure, false, \ 1011 "Inject thread creation failures for " \ 1012 "UseDynamicNumberOfCompilerThreads") \ 1013 \ 1014 develop(bool, UseStackBanging, true, \ 1015 "use stack banging for stack overflow checks (required for " \ 1016 "proper StackOverflow handling; disable only to measure cost " \ 1017 "of stackbanging)") \ 1018 \ 1019 develop(bool, UseStrictFP, true, \ 1020 "use strict fp if modifier strictfp is set") \ 1021 \ 1022 develop(bool, GenerateSynchronizationCode, true, \ 1023 "generate locking/unlocking code for synchronized methods and " \ 1024 "monitors") \ 1025 \ 1026 develop(bool, GenerateRangeChecks, true, \ 1027 "Generate range checks for array accesses") \ 1028 \ 1029 diagnostic_pd(bool, ImplicitNullChecks, \ 1030 "Generate code for implicit null checks") \ 1031 \ 1032 product_pd(bool, TrapBasedNullChecks, \ 1033 "Generate code for null checks that uses a cmp and trap " \ 1034 "instruction raising SIGTRAP. This is only used if an access to" \ 1035 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1036 "ImplicitNullChecks don't work (PPC64).") \ 1037 \ 1038 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1039 "Enable Thread SMR extra validity checks") \ 1040 \ 1041 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1042 "Enable Thread SMR Statistics") \ 1043 \ 1044 product(bool, UseNotificationThread, true, \ 1045 "Use Notification Thread") \ 1046 \ 1047 product(bool, Inline, true, \ 1048 "Enable inlining") \ 1049 \ 1050 product(bool, ClipInlining, true, \ 1051 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1052 \ 1053 develop(bool, UseCHA, true, \ 1054 "Enable CHA") \ 1055 \ 1056 product(bool, UseTypeProfile, true, \ 1057 "Check interpreter profile for historically monomorphic calls") \ 1058 \ 1059 diagnostic(bool, PrintInlining, false, \ 1060 "Print inlining optimizations") \ 1061 \ 1062 product(bool, UsePopCountInstruction, false, \ 1063 "Use population count instruction") \ 1064 \ 1065 develop(bool, EagerInitialization, false, \ 1066 "Eagerly initialize classes if possible") \ 1067 \ 1068 diagnostic(bool, LogTouchedMethods, false, \ 1069 "Log methods which have been ever touched in runtime") \ 1070 \ 1071 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1072 "Print all methods that have been ever touched in runtime") \ 1073 \ 1074 develop(bool, TraceMethodReplacement, false, \ 1075 "Print when methods are replaced do to recompilation") \ 1076 \ 1077 develop(bool, PrintMethodFlushing, false, \ 1078 "Print the nmethods being flushed") \ 1079 \ 1080 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1081 "print statistics about method flushing") \ 1082 \ 1083 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1084 "Number of compiled code invocations after which " \ 1085 "the method is considered as hot by the flusher") \ 1086 range(1, max_jint) \ 1087 \ 1088 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1089 "Minimum number of sweeper passes before an nmethod " \ 1090 "can be flushed") \ 1091 range(0, max_intx) \ 1092 \ 1093 product(bool, UseCodeAging, true, \ 1094 "Insert counter to detect warm methods") \ 1095 \ 1096 diagnostic(bool, StressCodeAging, false, \ 1097 "Start with counters compiled in") \ 1098 \ 1099 develop(bool, StressCodeBuffers, false, \ 1100 "Exercise code buffer expansion and other rare state changes") \ 1101 \ 1102 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1103 "Generate extra debugging information for non-safepoints in " \ 1104 "nmethods") \ 1105 \ 1106 product(bool, PrintVMOptions, false, \ 1107 "Print flags that appeared on the command line") \ 1108 \ 1109 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1110 "Ignore unrecognized VM options") \ 1111 \ 1112 product(bool, PrintCommandLineFlags, false, \ 1113 "Print flags specified on command line or set by ergonomics") \ 1114 \ 1115 product(bool, PrintFlagsInitial, false, \ 1116 "Print all VM flags before argument processing and exit VM") \ 1117 \ 1118 product(bool, PrintFlagsFinal, false, \ 1119 "Print all VM flags after argument and ergonomic processing") \ 1120 \ 1121 notproduct(bool, PrintFlagsWithComments, false, \ 1122 "Print all VM flags with default values and descriptions and " \ 1123 "exit") \ 1124 \ 1125 product(bool, PrintFlagsRanges, false, \ 1126 "Print VM flags and their ranges") \ 1127 \ 1128 diagnostic(bool, SerializeVMOutput, true, \ 1129 "Use a mutex to serialize output to tty and LogFile") \ 1130 \ 1131 diagnostic(bool, DisplayVMOutput, true, \ 1132 "Display all VM output on the tty, independently of LogVMOutput") \ 1133 \ 1134 diagnostic(bool, LogVMOutput, false, \ 1135 "Save VM output to LogFile") \ 1136 \ 1137 diagnostic(ccstr, LogFile, NULL, \ 1138 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1139 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1140 \ 1141 product(ccstr, ErrorFile, NULL, \ 1142 "If an error occurs, save the error data to this file " \ 1143 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1144 \ 1145 product(bool, ExtensiveErrorReports, \ 1146 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1147 "Error reports are more extensive.") \ 1148 \ 1149 product(bool, DisplayVMOutputToStderr, false, \ 1150 "If DisplayVMOutput is true, display all VM output to stderr") \ 1151 \ 1152 product(bool, DisplayVMOutputToStdout, false, \ 1153 "If DisplayVMOutput is true, display all VM output to stdout") \ 1154 \ 1155 product(bool, ErrorFileToStderr, false, \ 1156 "If true, error data is printed to stderr instead of a file") \ 1157 \ 1158 product(bool, ErrorFileToStdout, false, \ 1159 "If true, error data is printed to stdout instead of a file") \ 1160 \ 1161 product(bool, UseHeavyMonitors, false, \ 1162 "use heavyweight instead of lightweight Java monitors") \ 1163 \ 1164 product(bool, PrintStringTableStatistics, false, \ 1165 "print statistics about the StringTable and SymbolTable") \ 1166 \ 1167 diagnostic(bool, VerifyStringTableAtExit, false, \ 1168 "verify StringTable contents at exit") \ 1169 \ 1170 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1171 "print histogram of the symbol table") \ 1172 \ 1173 notproduct(bool, ExitVMOnVerifyError, false, \ 1174 "standard exit from VM if bytecode verify error " \ 1175 "(only in debug mode)") \ 1176 \ 1177 diagnostic(ccstr, AbortVMOnException, NULL, \ 1178 "Call fatal if this exception is thrown. Example: " \ 1179 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1180 \ 1181 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1182 "Call fatal if the exception pointed by AbortVMOnException " \ 1183 "has this message") \ 1184 \ 1185 develop(bool, DebugVtables, false, \ 1186 "add debugging code to vtable dispatch") \ 1187 \ 1188 notproduct(bool, PrintVtableStats, false, \ 1189 "print vtables stats at end of run") \ 1190 \ 1191 develop(bool, TraceCreateZombies, false, \ 1192 "trace creation of zombie nmethods") \ 1193 \ 1194 product(bool, RangeCheckElimination, true, \ 1195 "Eliminate range checks") \ 1196 \ 1197 develop_pd(bool, UncommonNullCast, \ 1198 "track occurrences of null in casts; adjust compiler tactics") \ 1199 \ 1200 develop(bool, TypeProfileCasts, true, \ 1201 "treat casts like calls for purposes of type profiling") \ 1202 \ 1203 develop(bool, TraceLivenessGen, false, \ 1204 "Trace the generation of liveness analysis information") \ 1205 \ 1206 notproduct(bool, TraceLivenessQuery, false, \ 1207 "Trace queries of liveness analysis information") \ 1208 \ 1209 notproduct(bool, CollectIndexSetStatistics, false, \ 1210 "Collect information about IndexSets") \ 1211 \ 1212 develop(bool, UseLoopSafepoints, true, \ 1213 "Generate Safepoint nodes in every loop") \ 1214 \ 1215 develop(intx, FastAllocateSizeLimit, 128*K, \ 1216 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1217 "Inline allocations larger than this in doublewords must go slow")\ 1218 \ 1219 product_pd(bool, CompactStrings, \ 1220 "Enable Strings to use single byte chars in backing store") \ 1221 \ 1222 product_pd(uintx, TypeProfileLevel, \ 1223 "=XYZ, with Z: Type profiling of arguments at call; " \ 1224 "Y: Type profiling of return value at call; " \ 1225 "X: Type profiling of parameters to methods; " \ 1226 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1227 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1228 \ 1229 product(intx, TypeProfileArgsLimit, 2, \ 1230 "max number of call arguments to consider for type profiling") \ 1231 range(0, 16) \ 1232 \ 1233 product(intx, TypeProfileParmsLimit, 2, \ 1234 "max number of incoming parameters to consider for type profiling"\ 1235 ", -1 for all") \ 1236 range(-1, 64) \ 1237 \ 1238 /* statistics */ \ 1239 develop(bool, CountCompiledCalls, false, \ 1240 "Count method invocations") \ 1241 \ 1242 notproduct(bool, CountRuntimeCalls, false, \ 1243 "Count VM runtime calls") \ 1244 \ 1245 develop(bool, CountJNICalls, false, \ 1246 "Count jni method invocations") \ 1247 \ 1248 notproduct(bool, CountJVMCalls, false, \ 1249 "Count jvm method invocations") \ 1250 \ 1251 notproduct(bool, CountRemovableExceptions, false, \ 1252 "Count exceptions that could be replaced by branches due to " \ 1253 "inlining") \ 1254 \ 1255 notproduct(bool, ICMissHistogram, false, \ 1256 "Produce histogram of IC misses") \ 1257 \ 1258 /* interpreter */ \ 1259 product_pd(bool, RewriteBytecodes, \ 1260 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1261 \ 1262 product_pd(bool, RewriteFrequentPairs, \ 1263 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1264 \ 1265 diagnostic(bool, PrintInterpreter, false, \ 1266 "Print the generated interpreter code") \ 1267 \ 1268 product(bool, UseInterpreter, true, \ 1269 "Use interpreter for non-compiled methods") \ 1270 \ 1271 develop(bool, UseFastSignatureHandlers, true, \ 1272 "Use fast signature handlers for native calls") \ 1273 \ 1274 product(bool, UseLoopCounter, true, \ 1275 "Increment invocation counter on backward branch") \ 1276 \ 1277 product_pd(bool, UseOnStackReplacement, \ 1278 "Use on stack replacement, calls runtime if invoc. counter " \ 1279 "overflows in loop") \ 1280 \ 1281 notproduct(bool, TraceOnStackReplacement, false, \ 1282 "Trace on stack replacement") \ 1283 \ 1284 product_pd(bool, PreferInterpreterNativeStubs, \ 1285 "Use always interpreter stubs for native methods invoked via " \ 1286 "interpreter") \ 1287 \ 1288 develop(bool, CountBytecodes, false, \ 1289 "Count number of bytecodes executed") \ 1290 \ 1291 develop(bool, PrintBytecodeHistogram, false, \ 1292 "Print histogram of the executed bytecodes") \ 1293 \ 1294 develop(bool, PrintBytecodePairHistogram, false, \ 1295 "Print histogram of the executed bytecode pairs") \ 1296 \ 1297 diagnostic(bool, PrintSignatureHandlers, false, \ 1298 "Print code generated for native method signature handlers") \ 1299 \ 1300 develop(bool, VerifyOops, false, \ 1301 "Do plausibility checks for oops") \ 1302 \ 1303 develop(bool, CheckUnhandledOops, false, \ 1304 "Check for unhandled oops in VM code") \ 1305 \ 1306 develop(bool, VerifyJNIFields, trueInDebug, \ 1307 "Verify jfieldIDs for instance fields") \ 1308 \ 1309 notproduct(bool, VerifyJNIEnvThread, false, \ 1310 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1311 "from JNI") \ 1312 \ 1313 develop(bool, VerifyFPU, false, \ 1314 "Verify FPU state (check for NaN's, etc.)") \ 1315 \ 1316 develop(bool, VerifyThread, false, \ 1317 "Watch the thread register for corruption (SPARC only)") \ 1318 \ 1319 develop(bool, VerifyActivationFrameSize, false, \ 1320 "Verify that activation frame didn't become smaller than its " \ 1321 "minimal size") \ 1322 \ 1323 develop(bool, TraceFrequencyInlining, false, \ 1324 "Trace frequency based inlining") \ 1325 \ 1326 develop_pd(bool, InlineIntrinsics, \ 1327 "Inline intrinsics that can be statically resolved") \ 1328 \ 1329 product_pd(bool, ProfileInterpreter, \ 1330 "Profile at the bytecode level during interpretation") \ 1331 \ 1332 develop(bool, TraceProfileInterpreter, false, \ 1333 "Trace profiling at the bytecode level during interpretation. " \ 1334 "This outputs the profiling information collected to improve " \ 1335 "jit compilation.") \ 1336 \ 1337 develop_pd(bool, ProfileTraps, \ 1338 "Profile deoptimization traps at the bytecode level") \ 1339 \ 1340 product(intx, ProfileMaturityPercentage, 20, \ 1341 "number of method invocations/branches (expressed as % of " \ 1342 "CompileThreshold) before using the method's profile") \ 1343 range(0, 100) \ 1344 \ 1345 diagnostic(bool, PrintMethodData, false, \ 1346 "Print the results of +ProfileInterpreter at end of run") \ 1347 \ 1348 develop(bool, VerifyDataPointer, trueInDebug, \ 1349 "Verify the method data pointer during interpreter profiling") \ 1350 \ 1351 develop(bool, VerifyCompiledCode, false, \ 1352 "Include miscellaneous runtime verifications in nmethod code; " \ 1353 "default off because it disturbs nmethod size heuristics") \ 1354 \ 1355 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1356 "Manually make GC thread crash then dump java stack trace; " \ 1357 "Test only") \ 1358 \ 1359 /* compilation */ \ 1360 product(bool, UseCompiler, true, \ 1361 "Use Just-In-Time compilation") \ 1362 \ 1363 product(bool, UseCounterDecay, true, \ 1364 "Adjust recompilation counters") \ 1365 \ 1366 develop(intx, CounterHalfLifeTime, 30, \ 1367 "Half-life time of invocation counters (in seconds)") \ 1368 \ 1369 develop(intx, CounterDecayMinIntervalLength, 500, \ 1370 "The minimum interval (in milliseconds) between invocation of " \ 1371 "CounterDecay") \ 1372 \ 1373 product(bool, AlwaysCompileLoopMethods, false, \ 1374 "When using recompilation, never interpret methods " \ 1375 "containing loops") \ 1376 \ 1377 product(bool, DontCompileHugeMethods, true, \ 1378 "Do not compile methods > HugeMethodLimit") \ 1379 \ 1380 /* Bytecode escape analysis estimation. */ \ 1381 product(bool, EstimateArgEscape, true, \ 1382 "Analyze bytecodes to estimate escape state of arguments") \ 1383 \ 1384 product(intx, BCEATraceLevel, 0, \ 1385 "How much tracing to do of bytecode escape analysis estimates " \ 1386 "(0-3)") \ 1387 range(0, 3) \ 1388 \ 1389 product(intx, MaxBCEAEstimateLevel, 5, \ 1390 "Maximum number of nested calls that are analyzed by BC EA") \ 1391 range(0, max_jint) \ 1392 \ 1393 product(intx, MaxBCEAEstimateSize, 150, \ 1394 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1395 range(0, max_jint) \ 1396 \ 1397 product(intx, AllocatePrefetchStyle, 1, \ 1398 "0 = no prefetch, " \ 1399 "1 = generate prefetch instructions for each allocation, " \ 1400 "2 = use TLAB watermark to gate allocation prefetch, " \ 1401 "3 = generate one prefetch instruction per cache line") \ 1402 range(0, 3) \ 1403 \ 1404 product(intx, AllocatePrefetchDistance, -1, \ 1405 "Distance to prefetch ahead of allocation pointer. " \ 1406 "-1: use system-specific value (automatically determined") \ 1407 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1408 \ 1409 product(intx, AllocatePrefetchLines, 3, \ 1410 "Number of lines to prefetch ahead of array allocation pointer") \ 1411 range(1, 64) \ 1412 \ 1413 product(intx, AllocateInstancePrefetchLines, 1, \ 1414 "Number of lines to prefetch ahead of instance allocation " \ 1415 "pointer") \ 1416 range(1, 64) \ 1417 \ 1418 product(intx, AllocatePrefetchStepSize, 16, \ 1419 "Step size in bytes of sequential prefetch instructions") \ 1420 range(1, 512) \ 1421 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1422 \ 1423 product(intx, AllocatePrefetchInstr, 0, \ 1424 "Select instruction to prefetch ahead of allocation pointer") \ 1425 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1426 \ 1427 /* deoptimization */ \ 1428 develop(bool, TraceDeoptimization, false, \ 1429 "Trace deoptimization") \ 1430 \ 1431 develop(bool, PrintDeoptimizationDetails, false, \ 1432 "Print more information about deoptimization") \ 1433 \ 1434 develop(bool, DebugDeoptimization, false, \ 1435 "Tracing various information while debugging deoptimization") \ 1436 \ 1437 product(intx, SelfDestructTimer, 0, \ 1438 "Will cause VM to terminate after a given time (in minutes) " \ 1439 "(0 means off)") \ 1440 range(0, max_intx) \ 1441 \ 1442 product(intx, MaxJavaStackTraceDepth, 1024, \ 1443 "The maximum number of lines in the stack trace for Java " \ 1444 "exceptions (0 means all)") \ 1445 range(0, max_jint/2) \ 1446 \ 1447 /* notice: the max range value here is max_jint, not max_intx */ \ 1448 /* because of overflow issue */ \ 1449 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1450 "Guarantee a safepoint (at least) every so many milliseconds " \ 1451 "(0 means none)") \ 1452 range(0, max_jint) \ 1453 \ 1454 product(intx, SafepointTimeoutDelay, 10000, \ 1455 "Delay in milliseconds for option SafepointTimeout") \ 1456 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1457 NOT_LP64(range(0, max_intx)) \ 1458 \ 1459 product(intx, NmethodSweepActivity, 10, \ 1460 "Removes cold nmethods from code cache if > 0. Higher values " \ 1461 "result in more aggressive sweeping") \ 1462 range(0, 2000) \ 1463 \ 1464 notproduct(bool, LogSweeper, false, \ 1465 "Keep a ring buffer of sweeper activity") \ 1466 \ 1467 notproduct(intx, SweeperLogEntries, 1024, \ 1468 "Number of records in the ring buffer of sweeper activity") \ 1469 \ 1470 notproduct(intx, MemProfilingInterval, 500, \ 1471 "Time between each invocation of the MemProfiler") \ 1472 \ 1473 develop(intx, MallocCatchPtr, -1, \ 1474 "Hit breakpoint when mallocing/freeing this pointer") \ 1475 \ 1476 notproduct(ccstrlist, SuppressErrorAt, "", \ 1477 "List of assertions (file:line) to muzzle") \ 1478 \ 1479 develop(intx, StackPrintLimit, 100, \ 1480 "number of stack frames to print in VM-level stack dump") \ 1481 \ 1482 notproduct(intx, MaxElementPrintSize, 256, \ 1483 "maximum number of elements to print") \ 1484 \ 1485 notproduct(intx, MaxSubklassPrintSize, 4, \ 1486 "maximum number of subklasses to print when printing klass") \ 1487 \ 1488 product(intx, MaxInlineLevel, 15, \ 1489 "maximum number of nested calls that are inlined") \ 1490 range(0, max_jint) \ 1491 \ 1492 product(intx, MaxRecursiveInlineLevel, 1, \ 1493 "maximum number of nested recursive calls that are inlined") \ 1494 range(0, max_jint) \ 1495 \ 1496 develop(intx, MaxForceInlineLevel, 100, \ 1497 "maximum number of nested calls that are forced for inlining " \ 1498 "(using CompileCommand or marked w/ @ForceInline)") \ 1499 range(0, max_jint) \ 1500 \ 1501 product_pd(intx, InlineSmallCode, \ 1502 "Only inline already compiled methods if their code size is " \ 1503 "less than this") \ 1504 range(0, max_jint) \ 1505 \ 1506 product(intx, MaxInlineSize, 35, \ 1507 "The maximum bytecode size of a method to be inlined") \ 1508 range(0, max_jint) \ 1509 \ 1510 product_pd(intx, FreqInlineSize, \ 1511 "The maximum bytecode size of a frequent method to be inlined") \ 1512 range(0, max_jint) \ 1513 \ 1514 product(intx, MaxTrivialSize, 6, \ 1515 "The maximum bytecode size of a trivial method to be inlined") \ 1516 range(0, max_jint) \ 1517 \ 1518 product(intx, MinInliningThreshold, 250, \ 1519 "The minimum invocation count a method needs to have to be " \ 1520 "inlined") \ 1521 range(0, max_jint) \ 1522 \ 1523 develop(intx, MethodHistogramCutoff, 100, \ 1524 "The cutoff value for method invocation histogram (+CountCalls)") \ 1525 \ 1526 develop(intx, DontYieldALotInterval, 10, \ 1527 "Interval between which yields will be dropped (milliseconds)") \ 1528 \ 1529 notproduct(intx, DeoptimizeALotInterval, 5, \ 1530 "Number of exits until DeoptimizeALot kicks in") \ 1531 \ 1532 notproduct(intx, ZombieALotInterval, 5, \ 1533 "Number of exits until ZombieALot kicks in") \ 1534 \ 1535 diagnostic(uintx, MallocMaxTestWords, 0, \ 1536 "If non-zero, maximum number of words that malloc/realloc can " \ 1537 "allocate (for testing only)") \ 1538 range(0, max_uintx) \ 1539 \ 1540 product(intx, TypeProfileWidth, 2, \ 1541 "Number of receiver types to record in call/cast profile") \ 1542 range(0, 8) \ 1543 \ 1544 develop(intx, BciProfileWidth, 2, \ 1545 "Number of return bci's to record in ret profile") \ 1546 \ 1547 product(intx, PerMethodRecompilationCutoff, 400, \ 1548 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1549 range(-1, max_intx) \ 1550 \ 1551 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1552 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1553 range(-1, max_intx) \ 1554 \ 1555 product(intx, PerMethodTrapLimit, 100, \ 1556 "Limit on traps (of one kind) in a method (includes inlines)") \ 1557 range(0, max_jint) \ 1558 \ 1559 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1560 "Limit on speculative traps (of one kind) in a method " \ 1561 "(includes inlines)") \ 1562 range(0, max_jint) \ 1563 \ 1564 product(intx, PerBytecodeTrapLimit, 4, \ 1565 "Limit on traps (of one kind) at a particular BCI") \ 1566 range(0, max_jint) \ 1567 \ 1568 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1569 "Extra method data trap entries for speculation") \ 1570 \ 1571 develop(intx, InlineFrequencyRatio, 20, \ 1572 "Ratio of call site execution to caller method invocation") \ 1573 range(0, max_jint) \ 1574 \ 1575 diagnostic_pd(intx, InlineFrequencyCount, \ 1576 "Count of call site execution necessary to trigger frequent " \ 1577 "inlining") \ 1578 range(0, max_jint) \ 1579 \ 1580 develop(intx, InlineThrowCount, 50, \ 1581 "Force inlining of interpreted methods that throw this often") \ 1582 range(0, max_jint) \ 1583 \ 1584 develop(intx, InlineThrowMaxSize, 200, \ 1585 "Force inlining of throwing methods smaller than this") \ 1586 range(0, max_jint) \ 1587 \ 1588 develop(intx, ProfilerNodeSize, 1024, \ 1589 "Size in K to allocate for the Profile Nodes of each thread") \ 1590 range(0, 1024) \ 1591 \ 1592 product_pd(size_t, MetaspaceSize, \ 1593 "Initial threshold (in bytes) at which a garbage collection " \ 1594 "is done to reduce Metaspace usage") \ 1595 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1596 \ 1597 product(size_t, MaxMetaspaceSize, max_uintx, \ 1598 "Maximum size of Metaspaces (in bytes)") \ 1599 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1600 \ 1601 product(size_t, CompressedClassSpaceSize, 1*G, \ 1602 "Maximum size of class area in Metaspace when compressed " \ 1603 "class pointers are used") \ 1604 range(1*M, 3*G) \ 1605 \ 1606 manageable(uintx, MinHeapFreeRatio, 40, \ 1607 "The minimum percentage of heap free after GC to avoid expansion."\ 1608 " For most GCs this applies to the old generation. In G1 and" \ 1609 " ParallelGC it applies to the whole heap.") \ 1610 range(0, 100) \ 1611 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1612 \ 1613 manageable(uintx, MaxHeapFreeRatio, 70, \ 1614 "The maximum percentage of heap free after GC to avoid shrinking."\ 1615 " For most GCs this applies to the old generation. In G1 and" \ 1616 " ParallelGC it applies to the whole heap.") \ 1617 range(0, 100) \ 1618 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1619 \ 1620 product(bool, ShrinkHeapInSteps, true, \ 1621 "When disabled, informs the GC to shrink the java heap directly" \ 1622 " to the target size at the next full GC rather than requiring" \ 1623 " smaller steps during multiple full GCs.") \ 1624 \ 1625 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1626 "Number of milliseconds per MB of free space in the heap") \ 1627 range(0, max_intx) \ 1628 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1629 \ 1630 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1631 "The minimum change in heap space due to GC (in bytes)") \ 1632 range(0, max_uintx) \ 1633 \ 1634 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1635 "The minimum expansion of Metaspace (in bytes)") \ 1636 range(0, max_uintx) \ 1637 \ 1638 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1639 "The maximum percentage of Metaspace free after GC to avoid " \ 1640 "shrinking") \ 1641 range(0, 100) \ 1642 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1643 \ 1644 product(uintx, MinMetaspaceFreeRatio, 40, \ 1645 "The minimum percentage of Metaspace free after GC to avoid " \ 1646 "expansion") \ 1647 range(0, 99) \ 1648 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1649 \ 1650 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1651 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1652 range(0, max_uintx) \ 1653 \ 1654 /* stack parameters */ \ 1655 product_pd(intx, StackYellowPages, \ 1656 "Number of yellow zone (recoverable overflows) pages of size " \ 1657 "4KB. If pages are bigger yellow zone is aligned up.") \ 1658 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1659 \ 1660 product_pd(intx, StackRedPages, \ 1661 "Number of red zone (unrecoverable overflows) pages of size " \ 1662 "4KB. If pages are bigger red zone is aligned up.") \ 1663 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1664 \ 1665 product_pd(intx, StackReservedPages, \ 1666 "Number of reserved zone (reserved to annotated methods) pages" \ 1667 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1668 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1669 \ 1670 product(bool, RestrictReservedStack, true, \ 1671 "Restrict @ReservedStackAccess to trusted classes") \ 1672 \ 1673 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1674 product_pd(intx, StackShadowPages, \ 1675 "Number of shadow zone (for overflow checking) pages of size " \ 1676 "4KB. If pages are bigger shadow zone is aligned up. " \ 1677 "This should exceed the depth of the VM and native call stack.") \ 1678 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1679 \ 1680 product_pd(intx, ThreadStackSize, \ 1681 "Thread Stack Size (in Kbytes)") \ 1682 range(0, 1 * M) \ 1683 \ 1684 product_pd(intx, VMThreadStackSize, \ 1685 "Non-Java Thread Stack Size (in Kbytes)") \ 1686 range(0, max_intx/(1 * K)) \ 1687 \ 1688 product_pd(intx, CompilerThreadStackSize, \ 1689 "Compiler Thread Stack Size (in Kbytes)") \ 1690 range(0, max_intx/(1 * K)) \ 1691 \ 1692 develop_pd(size_t, JVMInvokeMethodSlack, \ 1693 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1694 \ 1695 /* code cache parameters */ \ 1696 develop_pd(uintx, CodeCacheSegmentSize, \ 1697 "Code cache segment size (in bytes) - smallest unit of " \ 1698 "allocation") \ 1699 range(1, 1024) \ 1700 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1701 \ 1702 develop_pd(intx, CodeEntryAlignment, \ 1703 "Code entry alignment for generated code (in bytes)") \ 1704 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1705 \ 1706 product_pd(intx, OptoLoopAlignment, \ 1707 "Align inner loops to zero relative to this modulus") \ 1708 range(1, 16) \ 1709 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1710 \ 1711 product_pd(uintx, InitialCodeCacheSize, \ 1712 "Initial code cache size (in bytes)") \ 1713 range(os::vm_page_size(), max_uintx) \ 1714 \ 1715 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1716 "Minimum code cache size (in bytes) required to start VM.") \ 1717 range(0, max_uintx) \ 1718 \ 1719 product(bool, SegmentedCodeCache, false, \ 1720 "Use a segmented code cache") \ 1721 \ 1722 product_pd(uintx, ReservedCodeCacheSize, \ 1723 "Reserved code cache size (in bytes) - maximum code cache size") \ 1724 range(os::vm_page_size(), max_uintx) \ 1725 \ 1726 product_pd(uintx, NonProfiledCodeHeapSize, \ 1727 "Size of code heap with non-profiled methods (in bytes)") \ 1728 range(0, max_uintx) \ 1729 \ 1730 product_pd(uintx, ProfiledCodeHeapSize, \ 1731 "Size of code heap with profiled methods (in bytes)") \ 1732 range(0, max_uintx) \ 1733 \ 1734 product_pd(uintx, NonNMethodCodeHeapSize, \ 1735 "Size of code heap with non-nmethods (in bytes)") \ 1736 range(os::vm_page_size(), max_uintx) \ 1737 \ 1738 product_pd(uintx, CodeCacheExpansionSize, \ 1739 "Code cache expansion size (in bytes)") \ 1740 range(32*K, max_uintx) \ 1741 \ 1742 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1743 "Minimum number of segments in a code cache block") \ 1744 range(1, 100) \ 1745 \ 1746 notproduct(bool, ExitOnFullCodeCache, false, \ 1747 "Exit the VM if we fill the code cache") \ 1748 \ 1749 product(bool, UseCodeCacheFlushing, true, \ 1750 "Remove cold/old nmethods from the code cache") \ 1751 \ 1752 product(uintx, StartAggressiveSweepingAt, 10, \ 1753 "Start aggressive sweeping if X[%] of the code cache is free." \ 1754 "Segmented code cache: X[%] of the non-profiled heap." \ 1755 "Non-segmented code cache: X[%] of the total code cache") \ 1756 range(0, 100) \ 1757 \ 1758 /* AOT parameters */ \ 1759 experimental(bool, UseAOT, false, \ 1760 "Use AOT compiled files") \ 1761 \ 1762 experimental(ccstrlist, AOTLibrary, NULL, \ 1763 "AOT library") \ 1764 \ 1765 experimental(bool, PrintAOT, false, \ 1766 "Print used AOT klasses and methods") \ 1767 \ 1768 notproduct(bool, PrintAOTStatistics, false, \ 1769 "Print AOT statistics") \ 1770 \ 1771 diagnostic(bool, UseAOTStrictLoading, false, \ 1772 "Exit the VM if any of the AOT libraries has invalid config") \ 1773 \ 1774 product(bool, CalculateClassFingerprint, false, \ 1775 "Calculate class fingerprint") \ 1776 \ 1777 /* interpreter debugging */ \ 1778 develop(intx, BinarySwitchThreshold, 5, \ 1779 "Minimal number of lookupswitch entries for rewriting to binary " \ 1780 "switch") \ 1781 \ 1782 develop(intx, StopInterpreterAt, 0, \ 1783 "Stop interpreter execution at specified bytecode number") \ 1784 \ 1785 develop(intx, TraceBytecodesAt, 0, \ 1786 "Trace bytecodes starting with specified bytecode number") \ 1787 \ 1788 /* compiler interface */ \ 1789 develop(intx, CIStart, 0, \ 1790 "The id of the first compilation to permit") \ 1791 \ 1792 develop(intx, CIStop, max_jint, \ 1793 "The id of the last compilation to permit") \ 1794 \ 1795 develop(intx, CIStartOSR, 0, \ 1796 "The id of the first osr compilation to permit " \ 1797 "(CICountOSR must be on)") \ 1798 \ 1799 develop(intx, CIStopOSR, max_jint, \ 1800 "The id of the last osr compilation to permit " \ 1801 "(CICountOSR must be on)") \ 1802 \ 1803 develop(intx, CIBreakAtOSR, -1, \ 1804 "The id of osr compilation to break at") \ 1805 \ 1806 develop(intx, CIBreakAt, -1, \ 1807 "The id of compilation to break at") \ 1808 \ 1809 product(ccstrlist, CompileOnly, "", \ 1810 "List of methods (pkg/class.name) to restrict compilation to") \ 1811 \ 1812 product(ccstr, CompileCommandFile, NULL, \ 1813 "Read compiler commands from this file [.hotspot_compiler]") \ 1814 \ 1815 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1816 "Read compiler directives from this file") \ 1817 \ 1818 product(ccstrlist, CompileCommand, "", \ 1819 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1820 \ 1821 develop(bool, ReplayCompiles, false, \ 1822 "Enable replay of compilations from ReplayDataFile") \ 1823 \ 1824 product(ccstr, ReplayDataFile, NULL, \ 1825 "File containing compilation replay information" \ 1826 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1827 \ 1828 product(ccstr, InlineDataFile, NULL, \ 1829 "File containing inlining replay information" \ 1830 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1831 \ 1832 develop(intx, ReplaySuppressInitializers, 2, \ 1833 "Control handling of class initialization during replay: " \ 1834 "0 - don't do anything special; " \ 1835 "1 - treat all class initializers as empty; " \ 1836 "2 - treat class initializers for application classes as empty; " \ 1837 "3 - allow all class initializers to run during bootstrap but " \ 1838 " pretend they are empty after starting replay") \ 1839 range(0, 3) \ 1840 \ 1841 develop(bool, ReplayIgnoreInitErrors, false, \ 1842 "Ignore exceptions thrown during initialization for replay") \ 1843 \ 1844 product(bool, DumpReplayDataOnError, true, \ 1845 "Record replay data for crashing compiler threads") \ 1846 \ 1847 product(bool, CICompilerCountPerCPU, false, \ 1848 "1 compiler thread for log(N CPUs)") \ 1849 \ 1850 notproduct(intx, CICrashAt, -1, \ 1851 "id of compilation to trigger assert in compiler thread for " \ 1852 "the purpose of testing, e.g. generation of replay data") \ 1853 notproduct(bool, CIObjectFactoryVerify, false, \ 1854 "enable potentially expensive verification in ciObjectFactory") \ 1855 \ 1856 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1857 "Abort VM when method had failed to compile.") \ 1858 \ 1859 /* Priorities */ \ 1860 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1861 \ 1862 product(intx, ThreadPriorityPolicy, 0, \ 1863 "0 : Normal. "\ 1864 " VM chooses priorities that are appropriate for normal "\ 1865 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1866 " to normal native priority. Java priorities below " \ 1867 " NORM_PRIORITY map to lower native priority values. On "\ 1868 " Windows applications are allowed to use higher native "\ 1869 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1870 " not use the highest possible native priority, "\ 1871 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1872 " system threads. On Linux thread priorities are ignored "\ 1873 " because the OS does not support static priority in "\ 1874 " SCHED_OTHER scheduling class which is the only choice for "\ 1875 " non-root, non-realtime applications. "\ 1876 "1 : Aggressive. "\ 1877 " Java thread priorities map over to the entire range of "\ 1878 " native thread priorities. Higher Java thread priorities map "\ 1879 " to higher native thread priorities. This policy should be "\ 1880 " used with care, as sometimes it can cause performance "\ 1881 " degradation in the application and/or the entire system. On "\ 1882 " Linux/BSD/macOS this policy requires root privilege or an "\ 1883 " extended capability.") \ 1884 range(0, 1) \ 1885 \ 1886 product(bool, ThreadPriorityVerbose, false, \ 1887 "Print priority changes") \ 1888 \ 1889 product(intx, CompilerThreadPriority, -1, \ 1890 "The native priority at which compiler threads should run " \ 1891 "(-1 means no change)") \ 1892 range(min_jint, max_jint) \ 1893 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1894 \ 1895 product(intx, VMThreadPriority, -1, \ 1896 "The native priority at which the VM thread should run " \ 1897 "(-1 means no change)") \ 1898 range(-1, 127) \ 1899 \ 1900 product(intx, JavaPriority1_To_OSPriority, -1, \ 1901 "Map Java priorities to OS priorities") \ 1902 range(-1, 127) \ 1903 \ 1904 product(intx, JavaPriority2_To_OSPriority, -1, \ 1905 "Map Java priorities to OS priorities") \ 1906 range(-1, 127) \ 1907 \ 1908 product(intx, JavaPriority3_To_OSPriority, -1, \ 1909 "Map Java priorities to OS priorities") \ 1910 range(-1, 127) \ 1911 \ 1912 product(intx, JavaPriority4_To_OSPriority, -1, \ 1913 "Map Java priorities to OS priorities") \ 1914 range(-1, 127) \ 1915 \ 1916 product(intx, JavaPriority5_To_OSPriority, -1, \ 1917 "Map Java priorities to OS priorities") \ 1918 range(-1, 127) \ 1919 \ 1920 product(intx, JavaPriority6_To_OSPriority, -1, \ 1921 "Map Java priorities to OS priorities") \ 1922 range(-1, 127) \ 1923 \ 1924 product(intx, JavaPriority7_To_OSPriority, -1, \ 1925 "Map Java priorities to OS priorities") \ 1926 range(-1, 127) \ 1927 \ 1928 product(intx, JavaPriority8_To_OSPriority, -1, \ 1929 "Map Java priorities to OS priorities") \ 1930 range(-1, 127) \ 1931 \ 1932 product(intx, JavaPriority9_To_OSPriority, -1, \ 1933 "Map Java priorities to OS priorities") \ 1934 range(-1, 127) \ 1935 \ 1936 product(intx, JavaPriority10_To_OSPriority,-1, \ 1937 "Map Java priorities to OS priorities") \ 1938 range(-1, 127) \ 1939 \ 1940 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1941 "Java thread priority 10 maps to critical scheduling priority") \ 1942 \ 1943 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1944 "Compiler thread(s) run at critical scheduling priority") \ 1945 \ 1946 develop(intx, NewCodeParameter, 0, \ 1947 "Testing Only: Create a dedicated integer parameter before " \ 1948 "putback") \ 1949 \ 1950 /* new oopmap storage allocation */ \ 1951 develop(intx, MinOopMapAllocation, 8, \ 1952 "Minimum number of OopMap entries in an OopMapSet") \ 1953 \ 1954 /* Background Compilation */ \ 1955 develop(intx, LongCompileThreshold, 50, \ 1956 "Used with +TraceLongCompiles") \ 1957 \ 1958 /* recompilation */ \ 1959 product_pd(intx, CompileThreshold, \ 1960 "number of interpreted method invocations before (re-)compiling") \ 1961 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1962 \ 1963 product(double, CompileThresholdScaling, 1.0, \ 1964 "Factor to control when first compilation happens " \ 1965 "(both with and without tiered compilation): " \ 1966 "values greater than 1.0 delay counter overflow, " \ 1967 "values between 0 and 1.0 rush counter overflow, " \ 1968 "value of 1.0 leaves compilation thresholds unchanged " \ 1969 "value of 0.0 is equivalent to -Xint. " \ 1970 "" \ 1971 "Flag can be set as per-method option. " \ 1972 "If a value is specified for a method, compilation thresholds " \ 1973 "for that method are scaled by both the value of the global flag "\ 1974 "and the value of the per-method flag.") \ 1975 range(0.0, DBL_MAX) \ 1976 \ 1977 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1978 "Interpreter (tier 0) invocation notification frequency") \ 1979 range(0, 30) \ 1980 \ 1981 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1982 "C1 without MDO (tier 2) invocation notification frequency") \ 1983 range(0, 30) \ 1984 \ 1985 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 1986 "C1 with MDO profiling (tier 3) invocation notification " \ 1987 "frequency") \ 1988 range(0, 30) \ 1989 \ 1990 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 1991 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 1992 range(0, 30) \ 1993 \ 1994 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 1995 "Interpreter (tier 0) invocation notification frequency") \ 1996 range(0, 30) \ 1997 \ 1998 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 1999 "C1 without MDO (tier 2) invocation notification frequency") \ 2000 range(0, 30) \ 2001 \ 2002 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 2003 "C1 with MDO profiling (tier 3) invocation notification " \ 2004 "frequency") \ 2005 range(0, 30) \ 2006 \ 2007 product(intx, Tier2CompileThreshold, 0, \ 2008 "threshold at which tier 2 compilation is invoked") \ 2009 range(0, max_jint) \ 2010 \ 2011 product(intx, Tier2BackEdgeThreshold, 0, \ 2012 "Back edge threshold at which tier 2 compilation is invoked") \ 2013 range(0, max_jint) \ 2014 \ 2015 product(intx, Tier3InvocationThreshold, 200, \ 2016 "Compile if number of method invocations crosses this " \ 2017 "threshold") \ 2018 range(0, max_jint) \ 2019 \ 2020 product(intx, Tier3MinInvocationThreshold, 100, \ 2021 "Minimum invocation to compile at tier 3") \ 2022 range(0, max_jint) \ 2023 \ 2024 product(intx, Tier3CompileThreshold, 2000, \ 2025 "Threshold at which tier 3 compilation is invoked (invocation " \ 2026 "minimum must be satisfied)") \ 2027 range(0, max_jint) \ 2028 \ 2029 product(intx, Tier3BackEdgeThreshold, 60000, \ 2030 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2031 range(0, max_jint) \ 2032 \ 2033 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2034 "Compile if number of method invocations crosses this " \ 2035 "threshold if coming from AOT") \ 2036 range(0, max_jint) \ 2037 \ 2038 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2039 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2040 range(0, max_jint) \ 2041 \ 2042 product(intx, Tier3AOTCompileThreshold, 15000, \ 2043 "Threshold at which tier 3 compilation is invoked (invocation " \ 2044 "minimum must be satisfied) if coming from AOT") \ 2045 range(0, max_jint) \ 2046 \ 2047 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2048 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2049 "if coming from AOT") \ 2050 range(0, max_jint) \ 2051 \ 2052 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \ 2053 "Switch to interpreter to profile if the number of method " \ 2054 "invocations crosses this threshold if coming from AOT " \ 2055 "(applicable only with " \ 2056 "CompilationMode=high-only|high-only-quick-internal)") \ 2057 range(0, max_jint) \ 2058 \ 2059 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \ 2060 "Minimum number of invocations to switch to interpreter " \ 2061 "to profile if coming from AOT " \ 2062 "(applicable only with " \ 2063 "CompilationMode=high-only|high-only-quick-internal)") \ 2064 range(0, max_jint) \ 2065 \ 2066 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \ 2067 "Threshold at which to switch to interpreter to profile " \ 2068 "if coming from AOT " \ 2069 "(invocation minimum must be satisfied, " \ 2070 "applicable only with " \ 2071 "CompilationMode=high-only|high-only-quick-internal)") \ 2072 range(0, max_jint) \ 2073 \ 2074 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \ 2075 "Back edge threshold at which to switch to interpreter " \ 2076 "to profile if coming from AOT " \ 2077 "(applicable only with " \ 2078 "CompilationMode=high-only|high-only-quick-internal)") \ 2079 range(0, max_jint) \ 2080 \ 2081 product(intx, Tier4InvocationThreshold, 5000, \ 2082 "Compile if number of method invocations crosses this " \ 2083 "threshold") \ 2084 range(0, max_jint) \ 2085 \ 2086 product(intx, Tier4MinInvocationThreshold, 600, \ 2087 "Minimum invocation to compile at tier 4") \ 2088 range(0, max_jint) \ 2089 \ 2090 product(intx, Tier4CompileThreshold, 15000, \ 2091 "Threshold at which tier 4 compilation is invoked (invocation " \ 2092 "minimum must be satisfied)") \ 2093 range(0, max_jint) \ 2094 \ 2095 product(intx, Tier4BackEdgeThreshold, 40000, \ 2096 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2097 range(0, max_jint) \ 2098 \ 2099 diagnostic(intx, Tier40InvocationThreshold, 5000, \ 2100 "Compile if number of method invocations crosses this " \ 2101 "threshold (applicable only with " \ 2102 "CompilationMode=high-only|high-only-quick-internal)") \ 2103 range(0, max_jint) \ 2104 \ 2105 diagnostic(intx, Tier40MinInvocationThreshold, 600, \ 2106 "Minimum number of invocations to compile at tier 4 " \ 2107 "(applicable only with " \ 2108 "CompilationMode=high-only|high-only-quick-internal)") \ 2109 range(0, max_jint) \ 2110 \ 2111 diagnostic(intx, Tier40CompileThreshold, 10000, \ 2112 "Threshold at which tier 4 compilation is invoked (invocation " \ 2113 "minimum must be satisfied, applicable only with " \ 2114 "CompilationMode=high-only|high-only-quick-internal)") \ 2115 range(0, max_jint) \ 2116 \ 2117 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \ 2118 "Back edge threshold at which tier 4 OSR compilation is invoked " \ 2119 "(applicable only with " \ 2120 "CompilationMode=high-only|high-only-quick-internal)") \ 2121 range(0, max_jint) \ 2122 \ 2123 diagnostic(intx, Tier0Delay, 5, \ 2124 "If C2 queue size grows over this amount per compiler thread " \ 2125 "do not start profiling in the interpreter " \ 2126 "(applicable only with " \ 2127 "CompilationMode=high-only|high-only-quick-internal)") \ 2128 range(0, max_jint) \ 2129 \ 2130 product(intx, Tier3DelayOn, 5, \ 2131 "If C2 queue size grows over this amount per compiler thread " \ 2132 "stop compiling at tier 3 and start compiling at tier 2") \ 2133 range(0, max_jint) \ 2134 \ 2135 product(intx, Tier3DelayOff, 2, \ 2136 "If C2 queue size is less than this amount per compiler thread " \ 2137 "allow methods compiled at tier 2 transition to tier 3") \ 2138 range(0, max_jint) \ 2139 \ 2140 product(intx, Tier3LoadFeedback, 5, \ 2141 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2142 "reaches this amount per compiler thread") \ 2143 range(0, max_jint) \ 2144 \ 2145 product(intx, Tier4LoadFeedback, 3, \ 2146 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2147 "reaches this amount per compiler thread") \ 2148 range(0, max_jint) \ 2149 \ 2150 product(intx, TieredCompileTaskTimeout, 50, \ 2151 "Kill compile task if method was not used within " \ 2152 "given timeout in milliseconds") \ 2153 range(0, max_intx) \ 2154 \ 2155 product(intx, TieredStopAtLevel, 4, \ 2156 "Stop at given compilation level") \ 2157 range(0, 4) \ 2158 \ 2159 product(intx, Tier0ProfilingStartPercentage, 200, \ 2160 "Start profiling in interpreter if the counters exceed tier 3 " \ 2161 "thresholds (tier 4 thresholds with " \ 2162 "CompilationMode=high-only|high-only-quick-internal)" \ 2163 "by the specified percentage") \ 2164 range(0, max_jint) \ 2165 \ 2166 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2167 "Increase the compile threshold for C1 compilation if the code " \ 2168 "cache is filled by the specified percentage") \ 2169 range(0, 99) \ 2170 \ 2171 product(intx, TieredRateUpdateMinTime, 1, \ 2172 "Minimum rate sampling interval (in milliseconds)") \ 2173 range(0, max_intx) \ 2174 \ 2175 product(intx, TieredRateUpdateMaxTime, 25, \ 2176 "Maximum rate sampling interval (in milliseconds)") \ 2177 range(0, max_intx) \ 2178 \ 2179 product(ccstr, CompilationMode, "default", \ 2180 "Compilation modes: " \ 2181 "default: normal tiered compilation; " \ 2182 "quick-only: C1-only mode; " \ 2183 "high-only: C2/JVMCI-only mode; " \ 2184 "high-only-quick-internal: C2/JVMCI-only mode, " \ 2185 "with JVMCI compiler compiled with C1.") \ 2186 \ 2187 product_pd(bool, TieredCompilation, \ 2188 "Enable tiered compilation") \ 2189 \ 2190 product(bool, PrintTieredEvents, false, \ 2191 "Print tiered events notifications") \ 2192 \ 2193 product_pd(intx, OnStackReplacePercentage, \ 2194 "NON_TIERED number of method invocations/branches (expressed as " \ 2195 "% of CompileThreshold) before (re-)compiling OSR code") \ 2196 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2197 \ 2198 product(intx, InterpreterProfilePercentage, 33, \ 2199 "NON_TIERED number of method invocations/branches (expressed as " \ 2200 "% of CompileThreshold) before profiling in the interpreter") \ 2201 range(0, 100) \ 2202 \ 2203 develop(intx, DesiredMethodLimit, 8000, \ 2204 "The desired maximum method size (in bytecodes) after inlining") \ 2205 \ 2206 develop(intx, HugeMethodLimit, 8000, \ 2207 "Don't compile methods larger than this if " \ 2208 "+DontCompileHugeMethods") \ 2209 \ 2210 /* Properties for Java libraries */ \ 2211 \ 2212 product(uint64_t, MaxDirectMemorySize, 0, \ 2213 "Maximum total size of NIO direct-buffer allocations") \ 2214 range(0, max_jlong) \ 2215 \ 2216 /* Flags used for temporary code during development */ \ 2217 \ 2218 diagnostic(bool, UseNewCode, false, \ 2219 "Testing Only: Use the new version while testing") \ 2220 \ 2221 diagnostic(bool, UseNewCode2, false, \ 2222 "Testing Only: Use the new version while testing") \ 2223 \ 2224 diagnostic(bool, UseNewCode3, false, \ 2225 "Testing Only: Use the new version while testing") \ 2226 \ 2227 /* flags for performance data collection */ \ 2228 \ 2229 product(bool, UsePerfData, true, \ 2230 "Flag to disable jvmstat instrumentation for performance testing "\ 2231 "and problem isolation purposes") \ 2232 \ 2233 product(bool, PerfDataSaveToFile, false, \ 2234 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2235 \ 2236 product(ccstr, PerfDataSaveFile, NULL, \ 2237 "Save PerfData memory to the specified absolute pathname. " \ 2238 "The string %p in the file name (if present) " \ 2239 "will be replaced by pid") \ 2240 \ 2241 product(intx, PerfDataSamplingInterval, 50, \ 2242 "Data sampling interval (in milliseconds)") \ 2243 range(PeriodicTask::min_interval, max_jint) \ 2244 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2245 \ 2246 product(bool, PerfDisableSharedMem, false, \ 2247 "Store performance data in standard memory") \ 2248 \ 2249 product(intx, PerfDataMemorySize, 32*K, \ 2250 "Size of performance data memory region. Will be rounded " \ 2251 "up to a multiple of the native os page size.") \ 2252 range(128, 32*64*K) \ 2253 \ 2254 product(intx, PerfMaxStringConstLength, 1024, \ 2255 "Maximum PerfStringConstant string length before truncation") \ 2256 range(32, 32*K) \ 2257 \ 2258 product(bool, PerfAllowAtExitRegistration, false, \ 2259 "Allow registration of atexit() methods") \ 2260 \ 2261 product(bool, PerfBypassFileSystemCheck, false, \ 2262 "Bypass Win32 file system criteria checks (Windows Only)") \ 2263 \ 2264 product(intx, UnguardOnExecutionViolation, 0, \ 2265 "Unguard page and retry on no-execute fault (Win32 only) " \ 2266 "0=off, 1=conservative, 2=aggressive") \ 2267 range(0, 2) \ 2268 \ 2269 /* Serviceability Support */ \ 2270 \ 2271 product(bool, ManagementServer, false, \ 2272 "Create JMX Management Server") \ 2273 \ 2274 product(bool, DisableAttachMechanism, false, \ 2275 "Disable mechanism that allows tools to attach to this VM") \ 2276 \ 2277 product(bool, StartAttachListener, false, \ 2278 "Always start Attach Listener at VM startup") \ 2279 \ 2280 product(bool, EnableDynamicAgentLoading, true, \ 2281 "Allow tools to load agents with the attach mechanism") \ 2282 \ 2283 manageable(bool, PrintConcurrentLocks, false, \ 2284 "Print java.util.concurrent locks in thread dump") \ 2285 \ 2286 /* Shared spaces */ \ 2287 \ 2288 product(bool, UseSharedSpaces, true, \ 2289 "Use shared spaces for metadata") \ 2290 \ 2291 product(bool, VerifySharedSpaces, false, \ 2292 "Verify integrity of shared spaces") \ 2293 \ 2294 product(bool, RequireSharedSpaces, false, \ 2295 "Require shared spaces for metadata") \ 2296 \ 2297 product(bool, DumpSharedSpaces, false, \ 2298 "Special mode: JVM reads a class list, loads classes, builds " \ 2299 "shared spaces, and dumps the shared spaces to a file to be " \ 2300 "used in future JVM runs") \ 2301 \ 2302 product(bool, DynamicDumpSharedSpaces, false, \ 2303 "Dynamic archive") \ 2304 \ 2305 product(bool, PrintSharedArchiveAndExit, false, \ 2306 "Print shared archive file contents") \ 2307 \ 2308 product(bool, PrintSharedDictionary, false, \ 2309 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2310 "dictionary") \ 2311 \ 2312 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2313 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2314 "Address to allocate shared memory region for class data") \ 2315 range(0, SIZE_MAX) \ 2316 \ 2317 product(ccstr, SharedArchiveConfigFile, NULL, \ 2318 "Data to add to the CDS archive file") \ 2319 \ 2320 product(uintx, SharedSymbolTableBucketSize, 4, \ 2321 "Average number of symbols per bucket in shared table") \ 2322 range(2, 246) \ 2323 \ 2324 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2325 "Allow Java agent to be run with CDS dumping") \ 2326 \ 2327 diagnostic(bool, PrintMethodHandleStubs, false, \ 2328 "Print generated stub code for method handles") \ 2329 \ 2330 develop(bool, TraceMethodHandles, false, \ 2331 "trace internal method handle operations") \ 2332 \ 2333 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2334 "perform extra checks when constructing method handles") \ 2335 \ 2336 diagnostic(bool, ShowHiddenFrames, false, \ 2337 "show method handle implementation frames (usually hidden)") \ 2338 \ 2339 experimental(bool, TrustFinalNonStaticFields, false, \ 2340 "trust final non-static declarations for constant folding") \ 2341 \ 2342 diagnostic(bool, FoldStableValues, true, \ 2343 "Optimize loads from stable fields (marked w/ @Stable)") \ 2344 \ 2345 develop(bool, TraceInvokeDynamic, false, \ 2346 "trace internal invoke dynamic operations") \ 2347 \ 2348 diagnostic(int, UseBootstrapCallInfo, 1, \ 2349 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2350 "resolved before the bootstrap method is called; 1: when a BSM " \ 2351 "that may accept a BootstrapCallInfo is detected, use that API " \ 2352 "to pass BSM arguments, which allows the BSM to delay their " \ 2353 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2354 "via that API, instead of with the eagerly-resolved array.") \ 2355 \ 2356 diagnostic(bool, PauseAtStartup, false, \ 2357 "Causes the VM to pause at startup time and wait for the pause " \ 2358 "file to be removed (default: ./vm.paused.<pid>)") \ 2359 \ 2360 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2361 "The file to create and for whose removal to await when pausing " \ 2362 "at startup. (default: ./vm.paused.<pid>)") \ 2363 \ 2364 diagnostic(bool, PauseAtExit, false, \ 2365 "Pause and wait for keypress on exit if a debugger is attached") \ 2366 \ 2367 product(bool, ExtendedDTraceProbes, false, \ 2368 "Enable performance-impacting dtrace probes") \ 2369 \ 2370 product(bool, DTraceMethodProbes, false, \ 2371 "Enable dtrace probes for method-entry and method-exit") \ 2372 \ 2373 product(bool, DTraceAllocProbes, false, \ 2374 "Enable dtrace probes for object allocation") \ 2375 \ 2376 product(bool, DTraceMonitorProbes, false, \ 2377 "Enable dtrace probes for monitor events") \ 2378 \ 2379 product(bool, RelaxAccessControlCheck, false, \ 2380 "Relax the access control checks in the verifier") \ 2381 \ 2382 product(uintx, StringTableSize, defaultStringTableSize, \ 2383 "Number of buckets in the interned String table " \ 2384 "(will be rounded to nearest higher power of 2)") \ 2385 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2386 \ 2387 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2388 "Number of buckets in the JVM internal Symbol table") \ 2389 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2390 \ 2391 product(bool, UseStringDeduplication, false, \ 2392 "Use string deduplication") \ 2393 \ 2394 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2395 "A string must reach this age (or be promoted to an old region) " \ 2396 "to be considered for deduplication") \ 2397 range(1, markWord::max_age) \ 2398 \ 2399 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2400 "Force table resize every time the table is scanned") \ 2401 \ 2402 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2403 "Force table rehash every time the table is scanned") \ 2404 \ 2405 diagnostic(bool, WhiteBoxAPI, false, \ 2406 "Enable internal testing APIs") \ 2407 \ 2408 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2409 "Default survivor space alignment in bytes") \ 2410 range(8, 256) \ 2411 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2412 \ 2413 product(ccstr, DumpLoadedClassList, NULL, \ 2414 "Dump the names all loaded classes, that could be stored into " \ 2415 "the CDS archive, in the specified file") \ 2416 \ 2417 product(ccstr, SharedClassListFile, NULL, \ 2418 "Override the default CDS class list") \ 2419 \ 2420 product(ccstr, SharedArchiveFile, NULL, \ 2421 "Override the default location of the CDS archive file") \ 2422 \ 2423 product(ccstr, ArchiveClassesAtExit, NULL, \ 2424 "The path and name of the dynamic archive file") \ 2425 \ 2426 product(ccstr, ExtraSharedClassListFile, NULL, \ 2427 "Extra classlist for building the CDS archive file") \ 2428 \ 2429 diagnostic(intx, ArchiveRelocationMode, 0, \ 2430 "(0) first map at preferred address, and if " \ 2431 "unsuccessful, map at alternative address (default); " \ 2432 "(1) always map at alternative address; " \ 2433 "(2) always map at preferred address, and if unsuccessful, " \ 2434 "do not map the archive") \ 2435 range(0, 2) \ 2436 \ 2437 experimental(size_t, ArrayAllocatorMallocLimit, \ 2438 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2439 "Allocation less than this value will be allocated " \ 2440 "using malloc. Larger allocations will use mmap.") \ 2441 \ 2442 experimental(bool, AlwaysAtomicAccesses, false, \ 2443 "Accesses to all variables should always be atomic") \ 2444 \ 2445 diagnostic(bool, UseUnalignedAccesses, false, \ 2446 "Use unaligned memory accesses in Unsafe") \ 2447 \ 2448 product_pd(bool, PreserveFramePointer, \ 2449 "Use the FP register for holding the frame pointer " \ 2450 "and not as a general purpose register.") \ 2451 \ 2452 diagnostic(bool, CheckIntrinsics, true, \ 2453 "When a class C is loaded, check that " \ 2454 "(1) all intrinsics defined by the VM for class C are present "\ 2455 "in the loaded class file and are marked with the " \ 2456 "@HotSpotIntrinsicCandidate annotation, that " \ 2457 "(2) there is an intrinsic registered for all loaded methods " \ 2458 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2459 "annotation, and that " \ 2460 "(3) no orphan methods exist for class C (i.e., methods for " \ 2461 "which the VM declares an intrinsic but that are not declared "\ 2462 "in the loaded class C. " \ 2463 "Check (3) is available only in debug builds.") \ 2464 \ 2465 diagnostic_pd(intx, InitArrayShortSize, \ 2466 "Threshold small size (in bytes) for clearing arrays. " \ 2467 "Anything this size or smaller may get converted to discrete " \ 2468 "scalar stores.") \ 2469 range(0, max_intx) \ 2470 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2471 \ 2472 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2473 "Disable backwards compatibility for compile commands.") \ 2474 \ 2475 diagnostic(bool, CompilerDirectivesPrint, false, \ 2476 "Print compiler directives on installation.") \ 2477 diagnostic(int, CompilerDirectivesLimit, 50, \ 2478 "Limit on number of compiler directives.") \ 2479 \ 2480 product(ccstr, AllocateHeapAt, NULL, \ 2481 "Path to the directoy where a temporary file will be created " \ 2482 "to use as the backing store for Java Heap.") \ 2483 \ 2484 experimental(ccstr, AllocateOldGenAt, NULL, \ 2485 "Path to the directoy where a temporary file will be " \ 2486 "created to use as the backing store for old generation." \ 2487 "File of size Xmx is pre-allocated for performance reason, so" \ 2488 "we need that much space available") \ 2489 \ 2490 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2491 "Run periodic metaspace verifications (0 - none, " \ 2492 "1 - always, >1 every nth interval)") \ 2493 \ 2494 diagnostic(bool, ShowRegistersOnAssert, true, \ 2495 "On internal errors, include registers in error report.") \ 2496 \ 2497 diagnostic(bool, UseSwitchProfiling, true, \ 2498 "leverage profiling for table/lookup switch") \ 2499 \ 2500 develop(bool, TraceMemoryWriteback, false, \ 2501 "Trace memory writeback operations") \ 2502 \ 2503 JFR_ONLY(product(bool, FlightRecorder, false, \ 2504 "(Deprecated) Enable Flight Recorder")) \ 2505 \ 2506 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2507 "Flight Recorder options")) \ 2508 \ 2509 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2510 "Start flight recording with options")) \ 2511 \ 2512 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2513 "Use platform unstable time where supported for timestamps only") 2514 2515 // Interface macros 2516 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2517 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2518 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2519 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2520 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2521 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2522 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2523 #ifdef PRODUCT 2524 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2525 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2526 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2527 #else 2528 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2529 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2530 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2531 #endif // PRODUCT 2532 // Special LP64 flags, product only needed for now. 2533 #ifdef _LP64 2534 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2535 #else 2536 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2537 #endif // _LP64 2538 2539 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2540 DECLARE_PD_DEVELOPER_FLAG, \ 2541 DECLARE_PRODUCT_FLAG, \ 2542 DECLARE_PD_PRODUCT_FLAG, \ 2543 DECLARE_DIAGNOSTIC_FLAG, \ 2544 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2545 DECLARE_EXPERIMENTAL_FLAG, \ 2546 DECLARE_NOTPRODUCT_FLAG, \ 2547 DECLARE_MANAGEABLE_FLAG, \ 2548 DECLARE_PRODUCT_RW_FLAG, \ 2549 DECLARE_LP64_PRODUCT_FLAG, \ 2550 IGNORE_RANGE, \ 2551 IGNORE_CONSTRAINT, \ 2552 IGNORE_WRITEABLE) 2553 2554 #endif // SHARE_RUNTIME_GLOBALS_HPP