globals.hpp revision 4004:212c5b9c38e7
1/* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29 30// use this for flags that are true per default in the tiered build 31// but false in non-tiered builds, and vice versa 32#ifdef TIERED 33#define trueInTiered true 34#define falseInTiered false 35#else 36#define trueInTiered false 37#define falseInTiered true 38#endif 39 40#ifdef TARGET_ARCH_x86 41# include "globals_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "globals_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "globals_zero.hpp" 48#endif 49#ifdef TARGET_ARCH_arm 50# include "globals_arm.hpp" 51#endif 52#ifdef TARGET_ARCH_ppc 53# include "globals_ppc.hpp" 54#endif 55#ifdef TARGET_OS_FAMILY_linux 56# include "globals_linux.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_solaris 59# include "globals_solaris.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_windows 62# include "globals_windows.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_bsd 65# include "globals_bsd.hpp" 66#endif 67#ifdef TARGET_OS_ARCH_linux_x86 68# include "globals_linux_x86.hpp" 69#endif 70#ifdef TARGET_OS_ARCH_linux_sparc 71# include "globals_linux_sparc.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_zero 74# include "globals_linux_zero.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_solaris_x86 77# include "globals_solaris_x86.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_solaris_sparc 80# include "globals_solaris_sparc.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_windows_x86 83# include "globals_windows_x86.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_linux_arm 86# include "globals_linux_arm.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_linux_ppc 89# include "globals_linux_ppc.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_bsd_x86 92# include "globals_bsd_x86.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_bsd_zero 95# include "globals_bsd_zero.hpp" 96#endif 97#ifdef COMPILER1 98#ifdef TARGET_ARCH_x86 99# include "c1_globals_x86.hpp" 100#endif 101#ifdef TARGET_ARCH_sparc 102# include "c1_globals_sparc.hpp" 103#endif 104#ifdef TARGET_ARCH_arm 105# include "c1_globals_arm.hpp" 106#endif 107#ifdef TARGET_ARCH_ppc 108# include "c1_globals_ppc.hpp" 109#endif 110#ifdef TARGET_OS_FAMILY_linux 111# include "c1_globals_linux.hpp" 112#endif 113#ifdef TARGET_OS_FAMILY_solaris 114# include "c1_globals_solaris.hpp" 115#endif 116#ifdef TARGET_OS_FAMILY_windows 117# include "c1_globals_windows.hpp" 118#endif 119#ifdef TARGET_OS_FAMILY_bsd 120# include "c1_globals_bsd.hpp" 121#endif 122#endif 123#ifdef COMPILER2 124#ifdef TARGET_ARCH_x86 125# include "c2_globals_x86.hpp" 126#endif 127#ifdef TARGET_ARCH_sparc 128# include "c2_globals_sparc.hpp" 129#endif 130#ifdef TARGET_ARCH_arm 131# include "c2_globals_arm.hpp" 132#endif 133#ifdef TARGET_OS_FAMILY_linux 134# include "c2_globals_linux.hpp" 135#endif 136#ifdef TARGET_OS_FAMILY_solaris 137# include "c2_globals_solaris.hpp" 138#endif 139#ifdef TARGET_OS_FAMILY_windows 140# include "c2_globals_windows.hpp" 141#endif 142#ifdef TARGET_OS_FAMILY_bsd 143# include "c2_globals_bsd.hpp" 144#endif 145#endif 146#ifdef SHARK 147#ifdef TARGET_ARCH_zero 148# include "shark_globals_zero.hpp" 149#endif 150#endif 151 152#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 153define_pd_global(bool, BackgroundCompilation, false); 154define_pd_global(bool, UseTLAB, false); 155define_pd_global(bool, CICompileOSR, false); 156define_pd_global(bool, UseTypeProfile, false); 157define_pd_global(bool, UseOnStackReplacement, false); 158define_pd_global(bool, InlineIntrinsics, false); 159define_pd_global(bool, PreferInterpreterNativeStubs, true); 160define_pd_global(bool, ProfileInterpreter, false); 161define_pd_global(bool, ProfileTraps, false); 162define_pd_global(bool, TieredCompilation, false); 163 164define_pd_global(intx, CompileThreshold, 0); 165define_pd_global(intx, BackEdgeThreshold, 0); 166 167define_pd_global(intx, OnStackReplacePercentage, 0); 168define_pd_global(bool, ResizeTLAB, false); 169define_pd_global(intx, FreqInlineSize, 0); 170define_pd_global(intx, InlineSmallCode, 0); 171define_pd_global(intx, NewSizeThreadIncrease, 4*K); 172define_pd_global(intx, InlineClassNatives, true); 173define_pd_global(intx, InlineUnsafeOps, true); 174define_pd_global(intx, InitialCodeCacheSize, 160*K); 175define_pd_global(intx, ReservedCodeCacheSize, 32*M); 176define_pd_global(intx, CodeCacheExpansionSize, 32*K); 177define_pd_global(intx, CodeCacheMinBlockLength, 1); 178define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 179define_pd_global(bool, NeverActAsServerClassMachine, true); 180define_pd_global(uint64_t,MaxRAM, 1ULL*G); 181#define CI_COMPILER_COUNT 0 182#else 183 184#ifdef COMPILER2 185#define CI_COMPILER_COUNT 2 186#else 187#define CI_COMPILER_COUNT 1 188#endif // COMPILER2 189 190#endif // no compilers 191 192// string type aliases used only in this file 193typedef const char* ccstr; 194typedef const char* ccstrlist; // represents string arguments which accumulate 195 196enum FlagValueOrigin { 197 DEFAULT = 0, 198 COMMAND_LINE = 1, 199 ENVIRON_VAR = 2, 200 CONFIG_FILE = 3, 201 MANAGEMENT = 4, 202 ERGONOMIC = 5, 203 ATTACH_ON_DEMAND = 6, 204 INTERNAL = 99 205}; 206 207struct Flag { 208 const char *type; 209 const char *name; 210 void* addr; 211 212 NOT_PRODUCT(const char *doc;) 213 214 const char *kind; 215 FlagValueOrigin origin; 216 217 // points to all Flags static array 218 static Flag *flags; 219 220 // number of flags 221 static size_t numFlags; 222 223 static Flag* find_flag(char* name, size_t length, bool allow_locked = false); 224 225 bool is_bool() const { return strcmp(type, "bool") == 0; } 226 bool get_bool() const { return *((bool*) addr); } 227 void set_bool(bool value) { *((bool*) addr) = value; } 228 229 bool is_intx() const { return strcmp(type, "intx") == 0; } 230 intx get_intx() const { return *((intx*) addr); } 231 void set_intx(intx value) { *((intx*) addr) = value; } 232 233 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 234 uintx get_uintx() const { return *((uintx*) addr); } 235 void set_uintx(uintx value) { *((uintx*) addr) = value; } 236 237 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 238 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 239 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 240 241 bool is_double() const { return strcmp(type, "double") == 0; } 242 double get_double() const { return *((double*) addr); } 243 void set_double(double value) { *((double*) addr) = value; } 244 245 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 246 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 247 ccstr get_ccstr() const { return *((ccstr*) addr); } 248 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 249 250 bool is_unlocker() const; 251 bool is_unlocked() const; 252 bool is_writeable() const; 253 bool is_external() const; 254 255 bool is_unlocker_ext() const; 256 bool is_unlocked_ext() const; 257 bool is_writeable_ext() const; 258 bool is_external_ext() const; 259 260 void get_locked_message(char*, int) const; 261 void get_locked_message_ext(char*, int) const; 262 263 void print_on(outputStream* st, bool withComments = false ); 264 void print_as_flag(outputStream* st); 265}; 266 267// debug flags control various aspects of the VM and are global accessible 268 269// use FlagSetting to temporarily change some debug flag 270// e.g. FlagSetting fs(DebugThisAndThat, true); 271// restored to previous value upon leaving scope 272class FlagSetting { 273 bool val; 274 bool* flag; 275 public: 276 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 277 ~FlagSetting() { *flag = val; } 278}; 279 280 281class CounterSetting { 282 intx* counter; 283 public: 284 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 285 ~CounterSetting() { (*counter)--; } 286}; 287 288 289class IntFlagSetting { 290 intx val; 291 intx* flag; 292 public: 293 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 294 ~IntFlagSetting() { *flag = val; } 295}; 296 297 298class DoubleFlagSetting { 299 double val; 300 double* flag; 301 public: 302 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 303 ~DoubleFlagSetting() { *flag = val; } 304}; 305 306 307class CommandLineFlags { 308 public: 309 static bool boolAt(char* name, size_t len, bool* value); 310 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 311 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 312 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 313 314 static bool intxAt(char* name, size_t len, intx* value); 315 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 316 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 317 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 318 319 static bool uintxAt(char* name, size_t len, uintx* value); 320 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 321 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 322 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 323 324 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 325 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 326 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 327 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 328 329 static bool doubleAt(char* name, size_t len, double* value); 330 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 331 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 332 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 333 334 static bool ccstrAt(char* name, size_t len, ccstr* value); 335 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 336 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 337 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 338 339 // Returns false if name is not a command line flag. 340 static bool wasSetOnCmdline(const char* name, bool* value); 341 static void printSetFlags(outputStream* out); 342 343 static void printFlags(outputStream* out, bool withComments); 344 345 static void verify() PRODUCT_RETURN; 346}; 347 348// use this for flags that are true by default in the debug version but 349// false in the optimized version, and vice versa 350#ifdef ASSERT 351#define trueInDebug true 352#define falseInDebug false 353#else 354#define trueInDebug false 355#define falseInDebug true 356#endif 357 358// use this for flags that are true per default in the product build 359// but false in development builds, and vice versa 360#ifdef PRODUCT 361#define trueInProduct true 362#define falseInProduct false 363#else 364#define trueInProduct false 365#define falseInProduct true 366#endif 367 368#ifdef JAVASE_EMBEDDED 369#define falseInEmbedded false 370#else 371#define falseInEmbedded true 372#endif 373 374// develop flags are settable / visible only during development and are constant in the PRODUCT version 375// product flags are always settable / visible 376// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 377 378// A flag must be declared with one of the following types: 379// bool, intx, uintx, ccstr. 380// The type "ccstr" is an alias for "const char*" and is used 381// only in this file, because the macrology requires single-token type names. 382 383// Note: Diagnostic options not meant for VM tuning or for product modes. 384// They are to be used for VM quality assurance or field diagnosis 385// of VM bugs. They are hidden so that users will not be encouraged to 386// try them as if they were VM ordinary execution options. However, they 387// are available in the product version of the VM. Under instruction 388// from support engineers, VM customers can turn them on to collect 389// diagnostic information about VM problems. To use a VM diagnostic 390// option, you must first specify +UnlockDiagnosticVMOptions. 391// (This master switch also affects the behavior of -Xprintflags.) 392// 393// experimental flags are in support of features that are not 394// part of the officially supported product, but are available 395// for experimenting with. They could, for example, be performance 396// features that may not have undergone full or rigorous QA, but which may 397// help performance in some cases and released for experimentation 398// by the community of users and developers. This flag also allows one to 399// be able to build a fully supported product that nonetheless also 400// ships with some unsupported, lightly tested, experimental features. 401// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 402// UnlockExperimentalVMOptions flag, which allows the control and 403// modification of the experimental flags. 404// 405// Nota bene: neither diagnostic nor experimental options should be used casually, 406// and they are not supported on production loads, except under explicit 407// direction from support engineers. 408// 409// manageable flags are writeable external product flags. 410// They are dynamically writeable through the JDK management interface 411// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 412// These flags are external exported interface (see CCC). The list of 413// manageable flags can be queried programmatically through the management 414// interface. 415// 416// A flag can be made as "manageable" only if 417// - the flag is defined in a CCC as an external exported interface. 418// - the VM implementation supports dynamic setting of the flag. 419// This implies that the VM must *always* query the flag variable 420// and not reuse state related to the flag state at any given time. 421// - you want the flag to be queried programmatically by the customers. 422// 423// product_rw flags are writeable internal product flags. 424// They are like "manageable" flags but for internal/private use. 425// The list of product_rw flags are internal/private flags which 426// may be changed/removed in a future release. It can be set 427// through the management interface to get/set value 428// when the name of flag is supplied. 429// 430// A flag can be made as "product_rw" only if 431// - the VM implementation supports dynamic setting of the flag. 432// This implies that the VM must *always* query the flag variable 433// and not reuse state related to the flag state at any given time. 434// 435// Note that when there is a need to support develop flags to be writeable, 436// it can be done in the same way as product_rw. 437 438#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 439 \ 440 lp64_product(bool, UseCompressedOops, false, \ 441 "Use 32-bit object references in 64-bit VM " \ 442 "lp64_product means flag is always constant in 32 bit VM") \ 443 \ 444 lp64_product(bool, UseCompressedKlassPointers, false, \ 445 "Use 32-bit klass pointers in 64-bit VM " \ 446 "lp64_product means flag is always constant in 32 bit VM") \ 447 \ 448 notproduct(bool, CheckCompressedOops, true, \ 449 "generate checks in encoding/decoding code in debug VM") \ 450 \ 451 product_pd(uintx, HeapBaseMinAddress, \ 452 "OS specific low limit for heap base address") \ 453 \ 454 diagnostic(bool, PrintCompressedOopsMode, false, \ 455 "Print compressed oops base address and encoding mode") \ 456 \ 457 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 458 "Default object alignment in bytes, 8 is minimum") \ 459 \ 460 /* UseMembar is theoretically a temp flag used for memory barrier \ 461 * removal testing. It was supposed to be removed before FCS but has \ 462 * been re-added (see 6401008) */ \ 463 product_pd(bool, UseMembar, \ 464 "(Unstable) Issues membars on thread state transitions") \ 465 \ 466 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 467 * that don't support it. This will be replaced by processor detection \ 468 * logic. \ 469 */ \ 470 product(bool, UsePPCLWSYNC, true, \ 471 "Use lwsync instruction if true, else use slower sync") \ 472 \ 473 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 474 "Whether to clean the chunk pool asynchronously") \ 475 \ 476 /* Temporary: See 6948537 */ \ 477 experimental(bool, UseMemSetInBOT, true, \ 478 "(Unstable) uses memset in BOT updates in GC code") \ 479 \ 480 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 481 "Enable normal processing of flags relating to field diagnostics")\ 482 \ 483 experimental(bool, UnlockExperimentalVMOptions, false, \ 484 "Enable normal processing of flags relating to experimental features")\ 485 \ 486 product(bool, JavaMonitorsInStackTrace, true, \ 487 "Print info. about Java monitor locks when the stacks are dumped")\ 488 \ 489 product_pd(bool, UseLargePages, \ 490 "Use large page memory") \ 491 \ 492 product_pd(bool, UseLargePagesIndividualAllocation, \ 493 "Allocate large pages individually for better affinity") \ 494 \ 495 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 496 "Fail large pages individual allocation") \ 497 \ 498 develop(bool, TracePageSizes, false, \ 499 "Trace page size selection and usage.") \ 500 \ 501 product(bool, UseNUMA, false, \ 502 "Use NUMA if available") \ 503 \ 504 product(bool, UseNUMAInterleaving, false, \ 505 "Interleave memory across NUMA nodes if available") \ 506 \ 507 product(uintx, NUMAInterleaveGranularity, 2*M, \ 508 "Granularity to use for NUMA interleaving on Windows OS") \ 509 \ 510 product(bool, ForceNUMA, false, \ 511 "Force NUMA optimizations on single-node/UMA systems") \ 512 \ 513 product(intx, NUMAChunkResizeWeight, 20, \ 514 "Percentage (0-100) used to weight the current sample when " \ 515 "computing exponentially decaying average for " \ 516 "AdaptiveNUMAChunkSizing") \ 517 \ 518 product(intx, NUMASpaceResizeRate, 1*G, \ 519 "Do not reallocate more that this amount per collection") \ 520 \ 521 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 522 "Enable adaptive chunk sizing for NUMA") \ 523 \ 524 product(bool, NUMAStats, false, \ 525 "Print NUMA stats in detailed heap information") \ 526 \ 527 product(intx, NUMAPageScanRate, 256, \ 528 "Maximum number of pages to include in the page scan procedure") \ 529 \ 530 product_pd(bool, NeedsDeoptSuspend, \ 531 "True for register window machines (sparc/ia64)") \ 532 \ 533 product(intx, UseSSE, 99, \ 534 "Highest supported SSE instructions set on x86/x64") \ 535 \ 536 product(bool, UseAES, false, \ 537 "Control whether AES instructions can be used on x86/x64") \ 538 \ 539 product(uintx, LargePageSizeInBytes, 0, \ 540 "Large page size (0 to let VM choose the page size") \ 541 \ 542 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 543 "Use large pages if max heap is at least this big") \ 544 \ 545 product(bool, ForceTimeHighResolution, false, \ 546 "Using high time resolution(For Win32 only)") \ 547 \ 548 develop(bool, TraceItables, false, \ 549 "Trace initialization and use of itables") \ 550 \ 551 develop(bool, TracePcPatching, false, \ 552 "Trace usage of frame::patch_pc") \ 553 \ 554 develop(bool, TraceJumps, false, \ 555 "Trace assembly jumps in thread ring buffer") \ 556 \ 557 develop(bool, TraceRelocator, false, \ 558 "Trace the bytecode relocator") \ 559 \ 560 develop(bool, TraceLongCompiles, false, \ 561 "Print out every time compilation is longer than " \ 562 "a given threashold") \ 563 \ 564 develop(bool, SafepointALot, false, \ 565 "Generates a lot of safepoints. Works with " \ 566 "GuaranteedSafepointInterval") \ 567 \ 568 product_pd(bool, BackgroundCompilation, \ 569 "A thread requesting compilation is not blocked during " \ 570 "compilation") \ 571 \ 572 product(bool, PrintVMQWaitTime, false, \ 573 "Prints out the waiting time in VM operation queue") \ 574 \ 575 develop(bool, NoYieldsInMicrolock, false, \ 576 "Disable yields in microlock") \ 577 \ 578 develop(bool, TraceOopMapGeneration, false, \ 579 "Shows oopmap generation") \ 580 \ 581 product(bool, MethodFlushing, true, \ 582 "Reclamation of zombie and not-entrant methods") \ 583 \ 584 develop(bool, VerifyStack, false, \ 585 "Verify stack of each thread when it is entering a runtime call") \ 586 \ 587 diagnostic(bool, ForceUnreachable, false, \ 588 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 589 \ 590 notproduct(bool, StressDerivedPointers, false, \ 591 "Force scavenge when a derived pointers is detected on stack " \ 592 "after rtm call") \ 593 \ 594 develop(bool, TraceDerivedPointers, false, \ 595 "Trace traversal of derived pointers on stack") \ 596 \ 597 notproduct(bool, TraceCodeBlobStacks, false, \ 598 "Trace stack-walk of codeblobs") \ 599 \ 600 product(bool, PrintJNIResolving, false, \ 601 "Used to implement -v:jni") \ 602 \ 603 notproduct(bool, PrintRewrites, false, \ 604 "Print methods that are being rewritten") \ 605 \ 606 product(bool, UseInlineCaches, true, \ 607 "Use Inline Caches for virtual calls ") \ 608 \ 609 develop(bool, InlineArrayCopy, true, \ 610 "inline arraycopy native that is known to be part of " \ 611 "base library DLL") \ 612 \ 613 develop(bool, InlineObjectHash, true, \ 614 "inline Object::hashCode() native that is known to be part " \ 615 "of base library DLL") \ 616 \ 617 develop(bool, InlineNatives, true, \ 618 "inline natives that are known to be part of base library DLL") \ 619 \ 620 develop(bool, InlineMathNatives, true, \ 621 "inline SinD, CosD, etc.") \ 622 \ 623 develop(bool, InlineClassNatives, true, \ 624 "inline Class.isInstance, etc") \ 625 \ 626 develop(bool, InlineThreadNatives, true, \ 627 "inline Thread.currentThread, etc") \ 628 \ 629 develop(bool, InlineUnsafeOps, true, \ 630 "inline memory ops (native methods) from sun.misc.Unsafe") \ 631 \ 632 product(bool, CriticalJNINatives, true, \ 633 "check for critical JNI entry points") \ 634 \ 635 notproduct(bool, StressCriticalJNINatives, false, \ 636 "Exercise register saving code in critical natives") \ 637 \ 638 product(bool, UseSSE42Intrinsics, false, \ 639 "SSE4.2 versions of intrinsics") \ 640 \ 641 product(bool, UseAESIntrinsics, false, \ 642 "use intrinsics for AES versions of crypto") \ 643 \ 644 develop(bool, TraceCallFixup, false, \ 645 "traces all call fixups") \ 646 \ 647 develop(bool, DeoptimizeALot, false, \ 648 "deoptimize at every exit from the runtime system") \ 649 \ 650 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 651 "a comma separated list of bcis to deoptimize at") \ 652 \ 653 product(bool, DeoptimizeRandom, false, \ 654 "deoptimize random frames on random exit from the runtime system")\ 655 \ 656 notproduct(bool, ZombieALot, false, \ 657 "creates zombies (non-entrant) at exit from the runt. system") \ 658 \ 659 product(bool, UnlinkSymbolsALot, false, \ 660 "unlink unreferenced symbols from the symbol table at safepoints")\ 661 \ 662 notproduct(bool, WalkStackALot, false, \ 663 "trace stack (no print) at every exit from the runtime system") \ 664 \ 665 product(bool, Debugging, false, \ 666 "set when executing debug methods in debug.ccp " \ 667 "(to prevent triggering assertions)") \ 668 \ 669 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 670 "Enable strict checks that safepoints cannot happen for threads " \ 671 "that used No_Safepoint_Verifier") \ 672 \ 673 notproduct(bool, VerifyLastFrame, false, \ 674 "Verify oops on last frame on entry to VM") \ 675 \ 676 develop(bool, TraceHandleAllocation, false, \ 677 "Prints out warnings when suspicious many handles are allocated") \ 678 \ 679 product(bool, UseCompilerSafepoints, true, \ 680 "Stop at safepoints in compiled code") \ 681 \ 682 product(bool, UseSplitVerifier, true, \ 683 "use split verifier with StackMapTable attributes") \ 684 \ 685 product(bool, FailOverToOldVerifier, true, \ 686 "fail over to old verifier when split verifier fails") \ 687 \ 688 develop(bool, ShowSafepointMsgs, false, \ 689 "Show msg. about safepoint synch.") \ 690 \ 691 product(bool, SafepointTimeout, false, \ 692 "Time out and warn or fail after SafepointTimeoutDelay " \ 693 "milliseconds if failed to reach safepoint") \ 694 \ 695 develop(bool, DieOnSafepointTimeout, false, \ 696 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 697 \ 698 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 699 /* typically, at most a few retries are needed */ \ 700 product(intx, SuspendRetryCount, 50, \ 701 "Maximum retry count for an external suspend request") \ 702 \ 703 product(intx, SuspendRetryDelay, 5, \ 704 "Milliseconds to delay per retry (* current_retry_count)") \ 705 \ 706 product(bool, AssertOnSuspendWaitFailure, false, \ 707 "Assert/Guarantee on external suspend wait failure") \ 708 \ 709 product(bool, TraceSuspendWaitFailures, false, \ 710 "Trace external suspend wait failures") \ 711 \ 712 product(bool, MaxFDLimit, true, \ 713 "Bump the number of file descriptors to max in solaris.") \ 714 \ 715 diagnostic(bool, LogEvents, true, \ 716 "Enable the various ring buffer event logs") \ 717 \ 718 diagnostic(intx, LogEventsBufferEntries, 10, \ 719 "Enable the various ring buffer event logs") \ 720 \ 721 product(bool, BytecodeVerificationRemote, true, \ 722 "Enables the Java bytecode verifier for remote classes") \ 723 \ 724 product(bool, BytecodeVerificationLocal, false, \ 725 "Enables the Java bytecode verifier for local classes") \ 726 \ 727 develop(bool, ForceFloatExceptions, trueInDebug, \ 728 "Force exceptions on FP stack under/overflow") \ 729 \ 730 develop(bool, VerifyStackAtCalls, false, \ 731 "Verify that the stack pointer is unchanged after calls") \ 732 \ 733 develop(bool, TraceJavaAssertions, false, \ 734 "Trace java language assertions") \ 735 \ 736 notproduct(bool, CheckAssertionStatusDirectives, false, \ 737 "temporary - see javaClasses.cpp") \ 738 \ 739 notproduct(bool, PrintMallocFree, false, \ 740 "Trace calls to C heap malloc/free allocation") \ 741 \ 742 product(bool, PrintOopAddress, false, \ 743 "Always print the location of the oop") \ 744 \ 745 notproduct(bool, VerifyCodeCacheOften, false, \ 746 "Verify compiled-code cache often") \ 747 \ 748 develop(bool, ZapDeadCompiledLocals, false, \ 749 "Zap dead locals in compiler frames") \ 750 \ 751 notproduct(bool, ZapDeadLocalsOld, false, \ 752 "Zap dead locals (old version, zaps all frames when " \ 753 "entering the VM") \ 754 \ 755 notproduct(bool, CheckOopishValues, false, \ 756 "Warn if value contains oop ( requires ZapDeadLocals)") \ 757 \ 758 develop(bool, UseMallocOnly, false, \ 759 "use only malloc/free for allocation (no resource area/arena)") \ 760 \ 761 develop(bool, PrintMalloc, false, \ 762 "print all malloc/free calls") \ 763 \ 764 develop(bool, PrintMallocStatistics, false, \ 765 "print malloc/free statistics") \ 766 \ 767 develop(bool, ZapResourceArea, trueInDebug, \ 768 "Zap freed resource/arena space with 0xABABABAB") \ 769 \ 770 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 771 "Zap freed VM handle space with 0xBCBCBCBC") \ 772 \ 773 develop(bool, ZapJNIHandleArea, trueInDebug, \ 774 "Zap freed JNI handle space with 0xFEFEFEFE") \ 775 \ 776 notproduct(bool, ZapStackSegments, trueInDebug, \ 777 "Zap allocated/freed Stack segments with 0xFADFADED") \ 778 \ 779 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 780 "Zap unused heap space with 0xBAADBABE") \ 781 \ 782 develop(bool, TraceZapUnusedHeapArea, false, \ 783 "Trace zapping of unused heap space") \ 784 \ 785 develop(bool, CheckZapUnusedHeapArea, false, \ 786 "Check zapping of unused heap space") \ 787 \ 788 develop(bool, ZapFillerObjects, trueInDebug, \ 789 "Zap filler objects with 0xDEAFBABE") \ 790 \ 791 develop(bool, PrintVMMessages, true, \ 792 "Print vm messages on console") \ 793 \ 794 product(bool, PrintGCApplicationConcurrentTime, false, \ 795 "Print the time the application has been running") \ 796 \ 797 product(bool, PrintGCApplicationStoppedTime, false, \ 798 "Print the time the application has been stopped") \ 799 \ 800 diagnostic(bool, VerboseVerification, false, \ 801 "Display detailed verification details") \ 802 \ 803 notproduct(uintx, ErrorHandlerTest, 0, \ 804 "If > 0, provokes an error after VM initialization; the value" \ 805 "determines which error to provoke. See test_error_handler()" \ 806 "in debug.cpp.") \ 807 \ 808 develop(bool, Verbose, false, \ 809 "Prints additional debugging information from other modes") \ 810 \ 811 develop(bool, PrintMiscellaneous, false, \ 812 "Prints uncategorized debugging information (requires +Verbose)") \ 813 \ 814 develop(bool, WizardMode, false, \ 815 "Prints much more debugging information") \ 816 \ 817 product(bool, ShowMessageBoxOnError, false, \ 818 "Keep process alive on VM fatal error") \ 819 \ 820 product(bool, CreateMinidumpOnCrash, false, \ 821 "Create minidump on VM fatal error") \ 822 \ 823 product_pd(bool, UseOSErrorReporting, \ 824 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 825 \ 826 product(bool, SuppressFatalErrorMessage, false, \ 827 "Do NO Fatal Error report [Avoid deadlock]") \ 828 \ 829 product(ccstrlist, OnError, "", \ 830 "Run user-defined commands on fatal error; see VMError.cpp " \ 831 "for examples") \ 832 \ 833 product(ccstrlist, OnOutOfMemoryError, "", \ 834 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 835 \ 836 manageable(bool, HeapDumpBeforeFullGC, false, \ 837 "Dump heap to file before any major stop-world GC") \ 838 \ 839 manageable(bool, HeapDumpAfterFullGC, false, \ 840 "Dump heap to file after any major stop-world GC") \ 841 \ 842 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 843 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 844 \ 845 manageable(ccstr, HeapDumpPath, NULL, \ 846 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 847 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 848 "in the working directory)") \ 849 \ 850 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 851 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 852 "when the heap usage is larger than this") \ 853 \ 854 develop(uintx, HeapDumpSegmentSize, 1*G, \ 855 "Approximate segment size when generating a segmented heap dump") \ 856 \ 857 develop(bool, BreakAtWarning, false, \ 858 "Execute breakpoint upon encountering VM warning") \ 859 \ 860 develop(bool, TraceVMOperation, false, \ 861 "Trace vm operations") \ 862 \ 863 develop(bool, UseFakeTimers, false, \ 864 "Tells whether the VM should use system time or a fake timer") \ 865 \ 866 product(ccstr, NativeMemoryTracking, "off", \ 867 "Native memory tracking options") \ 868 \ 869 diagnostic(bool, PrintNMTStatistics, false, \ 870 "Print native memory tracking summary data if it is on") \ 871 \ 872 diagnostic(bool, LogCompilation, false, \ 873 "Log compilation activity in detail to hotspot.log or LogFile") \ 874 \ 875 product(bool, PrintCompilation, false, \ 876 "Print compilations") \ 877 \ 878 diagnostic(bool, TraceNMethodInstalls, false, \ 879 "Trace nmethod intallation") \ 880 \ 881 diagnostic(intx, ScavengeRootsInCode, 2, \ 882 "0: do not allow scavengable oops in the code cache; " \ 883 "1: allow scavenging from the code cache; " \ 884 "2: emit as many constants as the compiler can see") \ 885 \ 886 product(bool, AlwaysRestoreFPU, false, \ 887 "Restore the FPU control word after every JNI call (expensive)") \ 888 \ 889 diagnostic(bool, PrintCompilation2, false, \ 890 "Print additional statistics per compilation") \ 891 \ 892 diagnostic(bool, PrintAdapterHandlers, false, \ 893 "Print code generated for i2c/c2i adapters") \ 894 \ 895 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 896 "Verify that i2c/c2i adapters are called properly") \ 897 \ 898 develop(bool, VerifyAdapterSharing, false, \ 899 "Verify that the code for shared adapters is the equivalent") \ 900 \ 901 diagnostic(bool, PrintAssembly, false, \ 902 "Print assembly code (using external disassembler.so)") \ 903 \ 904 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 905 "Options string passed to disassembler.so") \ 906 \ 907 diagnostic(bool, PrintNMethods, false, \ 908 "Print assembly code for nmethods when generated") \ 909 \ 910 diagnostic(bool, PrintNativeNMethods, false, \ 911 "Print assembly code for native nmethods when generated") \ 912 \ 913 develop(bool, PrintDebugInfo, false, \ 914 "Print debug information for all nmethods when generated") \ 915 \ 916 develop(bool, PrintRelocations, false, \ 917 "Print relocation information for all nmethods when generated") \ 918 \ 919 develop(bool, PrintDependencies, false, \ 920 "Print dependency information for all nmethods when generated") \ 921 \ 922 develop(bool, PrintExceptionHandlers, false, \ 923 "Print exception handler tables for all nmethods when generated") \ 924 \ 925 develop(bool, StressCompiledExceptionHandlers, false, \ 926 "Exercise compiled exception handlers") \ 927 \ 928 develop(bool, InterceptOSException, false, \ 929 "Starts debugger when an implicit OS (e.g., NULL) " \ 930 "exception happens") \ 931 \ 932 product(bool, PrintCodeCache, false, \ 933 "Print the code cache memory usage when exiting") \ 934 \ 935 develop(bool, PrintCodeCache2, false, \ 936 "Print detailed usage info on the code cache when exiting") \ 937 \ 938 product(bool, PrintCodeCacheOnCompilation, false, \ 939 "Print the code cache memory usage each time a method is compiled") \ 940 \ 941 diagnostic(bool, PrintStubCode, false, \ 942 "Print generated stub code") \ 943 \ 944 product(bool, StackTraceInThrowable, true, \ 945 "Collect backtrace in throwable when exception happens") \ 946 \ 947 product(bool, OmitStackTraceInFastThrow, true, \ 948 "Omit backtraces for some 'hot' exceptions in optimized code") \ 949 \ 950 product(bool, ProfilerPrintByteCodeStatistics, false, \ 951 "Prints byte code statictics when dumping profiler output") \ 952 \ 953 product(bool, ProfilerRecordPC, false, \ 954 "Collects tick for each 16 byte interval of compiled code") \ 955 \ 956 product(bool, ProfileVM, false, \ 957 "Profiles ticks that fall within VM (either in the VM Thread " \ 958 "or VM code called through stubs)") \ 959 \ 960 product(bool, ProfileIntervals, false, \ 961 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 962 \ 963 notproduct(bool, ProfilerCheckIntervals, false, \ 964 "Collect and print info on spacing of profiler ticks") \ 965 \ 966 develop(bool, PrintJVMWarnings, false, \ 967 "Prints warnings for unimplemented JVM functions") \ 968 \ 969 product(bool, PrintWarnings, true, \ 970 "Prints JVM warnings to output stream") \ 971 \ 972 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 973 "Prints warnings for stalled SpinLocks") \ 974 \ 975 develop(bool, InitializeJavaLangSystem, true, \ 976 "Initialize java.lang.System - turn off for individual " \ 977 "method debugging") \ 978 \ 979 develop(bool, InitializeJavaLangString, true, \ 980 "Initialize java.lang.String - turn off for individual " \ 981 "method debugging") \ 982 \ 983 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 984 "Initialize various error and exception classes - turn off for " \ 985 "individual method debugging") \ 986 \ 987 product(bool, RegisterFinalizersAtInit, true, \ 988 "Register finalizable objects at end of Object.<init> or " \ 989 "after allocation") \ 990 \ 991 develop(bool, RegisterReferences, true, \ 992 "Tells whether the VM should register soft/weak/final/phantom " \ 993 "references") \ 994 \ 995 develop(bool, IgnoreRewrites, false, \ 996 "Supress rewrites of bytecodes in the oopmap generator. " \ 997 "This is unsafe!") \ 998 \ 999 develop(bool, PrintCodeCacheExtension, false, \ 1000 "Print extension of code cache") \ 1001 \ 1002 develop(bool, UsePrivilegedStack, true, \ 1003 "Enable the security JVM functions") \ 1004 \ 1005 develop(bool, ProtectionDomainVerification, true, \ 1006 "Verifies protection domain before resolution in system " \ 1007 "dictionary") \ 1008 \ 1009 product(bool, ClassUnloading, true, \ 1010 "Do unloading of classes") \ 1011 \ 1012 develop(bool, DisableStartThread, false, \ 1013 "Disable starting of additional Java threads " \ 1014 "(for debugging only)") \ 1015 \ 1016 develop(bool, MemProfiling, false, \ 1017 "Write memory usage profiling to log file") \ 1018 \ 1019 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1020 "Prints the system dictionary at exit") \ 1021 \ 1022 experimental(intx, PredictedLoadedClassCount, 0, \ 1023 "Experimental: Tune loaded class cache starting size.") \ 1024 \ 1025 diagnostic(bool, UnsyncloadClass, false, \ 1026 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1027 "class loader must call VM synchronized for findClass " \ 1028 "and defineClass.") \ 1029 \ 1030 product(bool, AlwaysLockClassLoader, false, \ 1031 "Require the VM to acquire the class loader lock before calling " \ 1032 "loadClass() even for class loaders registering " \ 1033 "as parallel capable") \ 1034 \ 1035 product(bool, AllowParallelDefineClass, false, \ 1036 "Allow parallel defineClass requests for class loaders " \ 1037 "registering as parallel capable") \ 1038 \ 1039 product(bool, MustCallLoadClassInternal, false, \ 1040 "Call loadClassInternal() rather than loadClass()") \ 1041 \ 1042 product_pd(bool, DontYieldALot, \ 1043 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1044 \ 1045 product_pd(bool, ConvertSleepToYield, \ 1046 "Converts sleep(0) to thread yield " \ 1047 "(may be off for SOLARIS to improve GUI)") \ 1048 \ 1049 product(bool, ConvertYieldToSleep, false, \ 1050 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1051 "behavior (SOLARIS only)") \ 1052 \ 1053 product(bool, UseBoundThreads, true, \ 1054 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1055 \ 1056 develop(bool, UseDetachedThreads, true, \ 1057 "Use detached threads that are recycled upon termination " \ 1058 "(for SOLARIS only)") \ 1059 \ 1060 product(bool, UseLWPSynchronization, true, \ 1061 "Use LWP-based instead of libthread-based synchronization " \ 1062 "(SPARC only)") \ 1063 \ 1064 product(ccstr, SyncKnobs, NULL, \ 1065 "(Unstable) Various monitor synchronization tunables") \ 1066 \ 1067 product(intx, EmitSync, 0, \ 1068 "(Unsafe,Unstable) " \ 1069 " Controls emission of inline sync fast-path code") \ 1070 \ 1071 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1072 \ 1073 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1074 \ 1075 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1076 \ 1077 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1078 \ 1079 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1080 \ 1081 product(intx, hashCode, 5, \ 1082 "(Unstable) select hashCode generation algorithm" ) \ 1083 \ 1084 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1085 "(Unstable, Linux-specific)" \ 1086 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1087 \ 1088 product(bool, FilterSpuriousWakeups, true, \ 1089 "Prevent spurious or premature wakeups from object.wait " \ 1090 "(Solaris only)") \ 1091 \ 1092 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1093 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1094 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1095 \ 1096 develop(bool, UsePthreads, false, \ 1097 "Use pthread-based instead of libthread-based synchronization " \ 1098 "(SPARC only)") \ 1099 \ 1100 product(bool, AdjustConcurrency, false, \ 1101 "call thr_setconcurrency at thread create time to avoid " \ 1102 "LWP starvation on MP systems (For Solaris Only)") \ 1103 \ 1104 product(bool, ReduceSignalUsage, false, \ 1105 "Reduce the use of OS signals in Java and/or the VM") \ 1106 \ 1107 develop_pd(bool, ShareVtableStubs, \ 1108 "Share vtable stubs (smaller code but worse branch prediction") \ 1109 \ 1110 develop(bool, LoadLineNumberTables, true, \ 1111 "Tells whether the class file parser loads line number tables") \ 1112 \ 1113 develop(bool, LoadLocalVariableTables, true, \ 1114 "Tells whether the class file parser loads local variable tables")\ 1115 \ 1116 develop(bool, LoadLocalVariableTypeTables, true, \ 1117 "Tells whether the class file parser loads local variable type tables")\ 1118 \ 1119 product(bool, AllowUserSignalHandlers, false, \ 1120 "Do not complain if the application installs signal handlers " \ 1121 "(Solaris & Linux only)") \ 1122 \ 1123 product(bool, UseSignalChaining, true, \ 1124 "Use signal-chaining to invoke signal handlers installed " \ 1125 "by the application (Solaris & Linux only)") \ 1126 \ 1127 product(bool, UseAltSigs, false, \ 1128 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1129 "internal signals (Solaris only)") \ 1130 \ 1131 product(bool, AllowJNIEnvProxy, false, \ 1132 "Allow JNIEnv proxies for jdbx") \ 1133 \ 1134 product(bool, JNIDetachReleasesMonitors, true, \ 1135 "JNI DetachCurrentThread releases monitors owned by thread") \ 1136 \ 1137 product(bool, RestoreMXCSROnJNICalls, false, \ 1138 "Restore MXCSR when returning from JNI calls") \ 1139 \ 1140 product(bool, CheckJNICalls, false, \ 1141 "Verify all arguments to JNI calls") \ 1142 \ 1143 product(bool, UseFastJNIAccessors, true, \ 1144 "Use optimized versions of Get<Primitive>Field") \ 1145 \ 1146 product(bool, EagerXrunInit, false, \ 1147 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1148 " but not all -Xrun libraries may support the state of the VM at this time") \ 1149 \ 1150 product(bool, PreserveAllAnnotations, false, \ 1151 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1152 \ 1153 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1154 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1155 \ 1156 product(bool, LazyBootClassLoader, true, \ 1157 "Enable/disable lazy opening of boot class path entries") \ 1158 \ 1159 product(bool, UseXMMForArrayCopy, false, \ 1160 "Use SSE2 MOVQ instruction for Arraycopy") \ 1161 \ 1162 product(intx, FieldsAllocationStyle, 1, \ 1163 "0 - type based with oops first, 1 - with oops last, " \ 1164 "2 - oops in super and sub classes are together") \ 1165 \ 1166 product(bool, CompactFields, true, \ 1167 "Allocate nonstatic fields in gaps between previous fields") \ 1168 \ 1169 notproduct(bool, PrintCompactFieldsSavings, false, \ 1170 "Print how many words were saved with CompactFields") \ 1171 \ 1172 notproduct(bool, PrintFieldLayout, false, \ 1173 "Print field layout for each class") \ 1174 \ 1175 product(intx, ContendedPaddingWidth, 128, \ 1176 "How many bytes to pad the fields/classes marked @Contended with")\ 1177 \ 1178 product(bool, EnableContended, true, \ 1179 "Enable @Contended annotation support") \ 1180 \ 1181 product(bool, RestrictContended, true, \ 1182 "Restrict @Contended to trusted classes") \ 1183 \ 1184 product(bool, UseBiasedLocking, true, \ 1185 "Enable biased locking in JVM") \ 1186 \ 1187 product(intx, BiasedLockingStartupDelay, 4000, \ 1188 "Number of milliseconds to wait before enabling biased locking") \ 1189 \ 1190 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1191 "Print statistics of biased locking in JVM") \ 1192 \ 1193 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1194 "Threshold of number of revocations per type to try to " \ 1195 "rebias all objects in the heap of that type") \ 1196 \ 1197 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1198 "Threshold of number of revocations per type to permanently " \ 1199 "revoke biases of all objects in the heap of that type") \ 1200 \ 1201 product(intx, BiasedLockingDecayTime, 25000, \ 1202 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1203 "type after previous bulk rebias") \ 1204 \ 1205 /* tracing */ \ 1206 \ 1207 notproduct(bool, TraceRuntimeCalls, false, \ 1208 "Trace run-time calls") \ 1209 \ 1210 develop(bool, TraceJNICalls, false, \ 1211 "Trace JNI calls") \ 1212 \ 1213 notproduct(bool, TraceJVMCalls, false, \ 1214 "Trace JVM calls") \ 1215 \ 1216 product(ccstr, TraceJVMTI, NULL, \ 1217 "Trace flags for JVMTI functions and events") \ 1218 \ 1219 /* This option can change an EMCP method into an obsolete method. */ \ 1220 /* This can affect tests that except specific methods to be EMCP. */ \ 1221 /* This option should be used with caution. */ \ 1222 product(bool, StressLdcRewrite, false, \ 1223 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1224 \ 1225 product(intx, TraceRedefineClasses, 0, \ 1226 "Trace level for JVMTI RedefineClasses") \ 1227 \ 1228 develop(bool, StressMethodComparator, false, \ 1229 "run the MethodComparator on all loaded methods") \ 1230 \ 1231 /* change to false by default sometime after Mustang */ \ 1232 product(bool, VerifyMergedCPBytecodes, true, \ 1233 "Verify bytecodes after RedefineClasses constant pool merging") \ 1234 \ 1235 develop(bool, TraceJNIHandleAllocation, false, \ 1236 "Trace allocation/deallocation of JNI handle blocks") \ 1237 \ 1238 develop(bool, TraceThreadEvents, false, \ 1239 "Trace all thread events") \ 1240 \ 1241 develop(bool, TraceBytecodes, false, \ 1242 "Trace bytecode execution") \ 1243 \ 1244 develop(bool, TraceClassInitialization, false, \ 1245 "Trace class initialization") \ 1246 \ 1247 develop(bool, TraceExceptions, false, \ 1248 "Trace exceptions") \ 1249 \ 1250 develop(bool, TraceICs, false, \ 1251 "Trace inline cache changes") \ 1252 \ 1253 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1254 "Trace method invocation counter overflow") \ 1255 \ 1256 develop(bool, TraceInlineCacheClearing, false, \ 1257 "Trace clearing of inline caches in nmethods") \ 1258 \ 1259 develop(bool, TraceDependencies, false, \ 1260 "Trace dependencies") \ 1261 \ 1262 develop(bool, VerifyDependencies, trueInDebug, \ 1263 "Exercise and verify the compilation dependency mechanism") \ 1264 \ 1265 develop(bool, TraceNewOopMapGeneration, false, \ 1266 "Trace OopMapGeneration") \ 1267 \ 1268 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1269 "Trace OopMapGeneration: print detailed cell states") \ 1270 \ 1271 develop(bool, TimeOopMap, false, \ 1272 "Time calls to GenerateOopMap::compute_map() in sum") \ 1273 \ 1274 develop(bool, TimeOopMap2, false, \ 1275 "Time calls to GenerateOopMap::compute_map() individually") \ 1276 \ 1277 develop(bool, TraceMonitorMismatch, false, \ 1278 "Trace monitor matching failures during OopMapGeneration") \ 1279 \ 1280 develop(bool, TraceOopMapRewrites, false, \ 1281 "Trace rewritting of method oops during oop map generation") \ 1282 \ 1283 develop(bool, TraceSafepoint, false, \ 1284 "Trace safepoint operations") \ 1285 \ 1286 develop(bool, TraceICBuffer, false, \ 1287 "Trace usage of IC buffer") \ 1288 \ 1289 develop(bool, TraceCompiledIC, false, \ 1290 "Trace changes of compiled IC") \ 1291 \ 1292 notproduct(bool, TraceZapDeadLocals, false, \ 1293 "Trace zapping dead locals") \ 1294 \ 1295 develop(bool, TraceStartupTime, false, \ 1296 "Trace setup time") \ 1297 \ 1298 develop(bool, TraceProtectionDomainVerification, false, \ 1299 "Trace protection domain verifcation") \ 1300 \ 1301 develop(bool, TraceClearedExceptions, false, \ 1302 "Prints when an exception is forcibly cleared") \ 1303 \ 1304 product(bool, TraceClassResolution, false, \ 1305 "Trace all constant pool resolutions (for debugging)") \ 1306 \ 1307 product(bool, TraceBiasedLocking, false, \ 1308 "Trace biased locking in JVM") \ 1309 \ 1310 product(bool, TraceMonitorInflation, false, \ 1311 "Trace monitor inflation in JVM") \ 1312 \ 1313 /* gc */ \ 1314 \ 1315 product(bool, UseSerialGC, false, \ 1316 "Use the serial garbage collector") \ 1317 \ 1318 product(bool, UseG1GC, false, \ 1319 "Use the Garbage-First garbage collector") \ 1320 \ 1321 product(bool, UseParallelGC, false, \ 1322 "Use the Parallel Scavenge garbage collector") \ 1323 \ 1324 product(bool, UseParallelOldGC, false, \ 1325 "Use the Parallel Old garbage collector") \ 1326 \ 1327 product(uintx, HeapMaximumCompactionInterval, 20, \ 1328 "How often should we maximally compact the heap (not allowing " \ 1329 "any dead space)") \ 1330 \ 1331 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1332 "The collection count for the first maximum compaction") \ 1333 \ 1334 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1335 "In the Parallel Old garbage collector maximum compaction for " \ 1336 "a system GC") \ 1337 \ 1338 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1339 "The mean used by the par compact dead wood" \ 1340 "limiter (a number between 0-100).") \ 1341 \ 1342 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1343 "The standard deviation used by the par compact dead wood" \ 1344 "limiter (a number between 0-100).") \ 1345 \ 1346 product(uintx, ParallelGCThreads, 0, \ 1347 "Number of parallel threads parallel gc will use") \ 1348 \ 1349 product(bool, UseDynamicNumberOfGCThreads, false, \ 1350 "Dynamically choose the number of parallel threads " \ 1351 "parallel gc will use") \ 1352 \ 1353 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1354 "Force dynamic selection of the number of" \ 1355 "parallel threads parallel gc will use to aid debugging") \ 1356 \ 1357 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1358 "Size of heap (bytes) per GC thread used in calculating the " \ 1359 "number of GC threads") \ 1360 \ 1361 product(bool, TraceDynamicGCThreads, false, \ 1362 "Trace the dynamic GC thread usage") \ 1363 \ 1364 develop(bool, ParallelOldGCSplitALot, false, \ 1365 "Provoke splitting (copying data from a young gen space to" \ 1366 "multiple destination spaces)") \ 1367 \ 1368 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1369 "How often to provoke splitting a young gen space") \ 1370 \ 1371 product(uintx, ConcGCThreads, 0, \ 1372 "Number of threads concurrent gc will use") \ 1373 \ 1374 product(uintx, YoungPLABSize, 4096, \ 1375 "Size of young gen promotion labs (in HeapWords)") \ 1376 \ 1377 product(uintx, OldPLABSize, 1024, \ 1378 "Size of old gen promotion labs (in HeapWords)") \ 1379 \ 1380 product(uintx, GCTaskTimeStampEntries, 200, \ 1381 "Number of time stamp entries per gc worker thread") \ 1382 \ 1383 product(bool, AlwaysTenure, false, \ 1384 "Always tenure objects in eden. (ParallelGC only)") \ 1385 \ 1386 product(bool, NeverTenure, false, \ 1387 "Never tenure objects in eden, May tenure on overflow " \ 1388 "(ParallelGC only)") \ 1389 \ 1390 product(bool, ScavengeBeforeFullGC, true, \ 1391 "Scavenge youngest generation before each full GC, " \ 1392 "used with UseParallelGC") \ 1393 \ 1394 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1395 "Allow scavenges to occur when to_space contains objects.") \ 1396 \ 1397 product(bool, UseConcMarkSweepGC, false, \ 1398 "Use Concurrent Mark-Sweep GC in the old generation") \ 1399 \ 1400 product(bool, ExplicitGCInvokesConcurrent, false, \ 1401 "A System.gc() request invokes a concurrent collection;" \ 1402 " (effective only when UseConcMarkSweepGC)") \ 1403 \ 1404 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1405 "A System.gc() request invokes a concurrent collection and " \ 1406 "also unloads classes during such a concurrent gc cycle " \ 1407 "(effective only when UseConcMarkSweepGC)") \ 1408 \ 1409 product(bool, GCLockerInvokesConcurrent, false, \ 1410 "The exit of a JNI CS necessitating a scavenge also" \ 1411 " kicks off a bkgrd concurrent collection") \ 1412 \ 1413 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1414 "How much the GC can expand the eden by while the GC locker " \ 1415 "is active (as a percentage)") \ 1416 \ 1417 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1418 "Use Adaptive Free Lists in the CMS generation") \ 1419 \ 1420 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1421 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1422 \ 1423 develop(bool, RotateCMSCollectionTypes, false, \ 1424 "Rotate the CMS collections among concurrent and STW") \ 1425 \ 1426 product(bool, UseCMSBestFit, true, \ 1427 "Use CMS best fit allocation strategy") \ 1428 \ 1429 product(bool, UseCMSCollectionPassing, true, \ 1430 "Use passing of collection from background to foreground") \ 1431 \ 1432 product(bool, UseParNewGC, false, \ 1433 "Use parallel threads in the new generation.") \ 1434 \ 1435 product(bool, ParallelGCVerbose, false, \ 1436 "Verbose output for parallel GC.") \ 1437 \ 1438 product(intx, ParallelGCBufferWastePct, 10, \ 1439 "wasted fraction of parallel allocation buffer.") \ 1440 \ 1441 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1442 "Retain parallel allocation buffers across scavenges; " \ 1443 " -- disabled because this currently conflicts with " \ 1444 " parallel card scanning under certain conditions ") \ 1445 \ 1446 product(intx, TargetPLABWastePct, 10, \ 1447 "target wasted space in last buffer as pct of overall allocation")\ 1448 \ 1449 product(uintx, PLABWeight, 75, \ 1450 "Percentage (0-100) used to weight the current sample when" \ 1451 "computing exponentially decaying average for ResizePLAB.") \ 1452 \ 1453 product(bool, ResizePLAB, true, \ 1454 "Dynamically resize (survivor space) promotion labs") \ 1455 \ 1456 product(bool, PrintPLAB, false, \ 1457 "Print (survivor space) promotion labs sizing decisions") \ 1458 \ 1459 product(intx, ParGCArrayScanChunk, 50, \ 1460 "Scan a subset and push remainder, if array is bigger than this") \ 1461 \ 1462 product(bool, ParGCUseLocalOverflow, false, \ 1463 "Instead of a global overflow list, use local overflow stacks") \ 1464 \ 1465 product(bool, ParGCTrimOverflow, true, \ 1466 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1467 \ 1468 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1469 "Whether we should simulate work queue overflow in ParNew") \ 1470 \ 1471 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1472 "An `interval' counter that determines how frequently " \ 1473 "we simulate overflow; a smaller number increases frequency") \ 1474 \ 1475 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1476 "The desired number of objects to claim from the overflow list") \ 1477 \ 1478 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1479 "The number of strides per worker thread that we divide up the " \ 1480 "card table scanning work into") \ 1481 \ 1482 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1483 "The number of cards in each chunk of the parallel chunks used " \ 1484 "during card table scanning") \ 1485 \ 1486 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1487 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1488 "parallel GC.") \ 1489 \ 1490 product(uintx, OldPLABWeight, 50, \ 1491 "Percentage (0-100) used to weight the current sample when" \ 1492 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1493 \ 1494 product(bool, ResizeOldPLAB, true, \ 1495 "Dynamically resize (old gen) promotion labs") \ 1496 \ 1497 product(bool, PrintOldPLAB, false, \ 1498 "Print (old gen) promotion labs sizing decisions") \ 1499 \ 1500 product(uintx, CMSOldPLABMin, 16, \ 1501 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1502 \ 1503 product(uintx, CMSOldPLABMax, 1024, \ 1504 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1505 \ 1506 product(uintx, CMSOldPLABNumRefills, 4, \ 1507 "Nominal number of refills of CMS gen promotion lab cache" \ 1508 " per worker per block size") \ 1509 \ 1510 product(bool, CMSOldPLABResizeQuicker, false, \ 1511 "Whether to react on-the-fly during a scavenge to a sudden" \ 1512 " change in block demand rate") \ 1513 \ 1514 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1515 "The tolerance of the phase-change detector for on-the-fly" \ 1516 " PLAB resizing during a scavenge") \ 1517 \ 1518 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1519 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1520 " during a scavenge") \ 1521 \ 1522 product(bool, AlwaysPreTouch, false, \ 1523 "It forces all freshly committed pages to be pre-touched.") \ 1524 \ 1525 product_pd(intx, CMSYoungGenPerWorker, \ 1526 "The maximum size of young gen chosen by default per GC worker " \ 1527 "thread available") \ 1528 \ 1529 product(bool, CMSIncrementalMode, false, \ 1530 "Whether CMS GC should operate in \"incremental\" mode") \ 1531 \ 1532 product(uintx, CMSIncrementalDutyCycle, 10, \ 1533 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1534 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1535 "value") \ 1536 \ 1537 product(bool, CMSIncrementalPacing, true, \ 1538 "Whether the CMS incremental mode duty cycle should be " \ 1539 "automatically adjusted") \ 1540 \ 1541 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1542 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1543 "enabled (a percentage, 0-100)") \ 1544 \ 1545 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1546 "Percentage (0-100) used to add conservatism when computing the " \ 1547 "duty cycle") \ 1548 \ 1549 product(uintx, CMSIncrementalOffset, 0, \ 1550 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1551 " is shifted to the right within the period between young GCs") \ 1552 \ 1553 product(uintx, CMSExpAvgFactor, 50, \ 1554 "Percentage (0-100) used to weight the current sample when" \ 1555 "computing exponential averages for CMS statistics.") \ 1556 \ 1557 product(uintx, CMS_FLSWeight, 75, \ 1558 "Percentage (0-100) used to weight the current sample when" \ 1559 "computing exponentially decating averages for CMS FLS statistics.") \ 1560 \ 1561 product(uintx, CMS_FLSPadding, 1, \ 1562 "The multiple of deviation from mean to use for buffering" \ 1563 "against volatility in free list demand.") \ 1564 \ 1565 product(uintx, FLSCoalescePolicy, 2, \ 1566 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1567 \ 1568 product(bool, FLSAlwaysCoalesceLarge, false, \ 1569 "CMS: Larger free blocks are always available for coalescing") \ 1570 \ 1571 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1572 "CMS: the smaller the percentage the greater the coalition force")\ 1573 \ 1574 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1575 "CMS: the factor by which to inflate estimated demand of small" \ 1576 " block sizes to prevent coalescing with an adjoining block") \ 1577 \ 1578 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1579 "CMS: the factor by which to inflate estimated demand of large" \ 1580 " block sizes to prevent coalescing with an adjoining block") \ 1581 \ 1582 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1583 "CMS: the factor by which to inflate estimated demand of small" \ 1584 " block sizes to prevent splitting to supply demand for smaller" \ 1585 " blocks") \ 1586 \ 1587 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1588 "CMS: the factor by which to inflate estimated demand of large" \ 1589 " block sizes to prevent splitting to supply demand for smaller" \ 1590 " blocks") \ 1591 \ 1592 product(bool, CMSExtrapolateSweep, false, \ 1593 "CMS: cushion for block demand during sweep") \ 1594 \ 1595 product(uintx, CMS_SweepWeight, 75, \ 1596 "Percentage (0-100) used to weight the current sample when " \ 1597 "computing exponentially decaying average for inter-sweep " \ 1598 "duration") \ 1599 \ 1600 product(uintx, CMS_SweepPadding, 1, \ 1601 "The multiple of deviation from mean to use for buffering " \ 1602 "against volatility in inter-sweep duration.") \ 1603 \ 1604 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1605 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1606 "duration exceeds this threhold in milliseconds") \ 1607 \ 1608 develop(bool, CMSTraceIncrementalMode, false, \ 1609 "Trace CMS incremental mode") \ 1610 \ 1611 develop(bool, CMSTraceIncrementalPacing, false, \ 1612 "Trace CMS incremental mode pacing computation") \ 1613 \ 1614 develop(bool, CMSTraceThreadState, false, \ 1615 "Trace the CMS thread state (enable the trace_state() method)") \ 1616 \ 1617 product(bool, CMSClassUnloadingEnabled, true, \ 1618 "Whether class unloading enabled when using CMS GC") \ 1619 \ 1620 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1621 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1622 " for which classes may not be unloaded") \ 1623 \ 1624 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1625 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1626 \ 1627 product(bool, UseCMSCompactAtFullCollection, true, \ 1628 "Use mark sweep compact at full collections") \ 1629 \ 1630 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1631 "Number of CMS full collection done before compaction if > 0") \ 1632 \ 1633 develop(intx, CMSDictionaryChoice, 0, \ 1634 "Use BinaryTreeDictionary as default in the CMS generation") \ 1635 \ 1636 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1637 "Replenish an indexed free list with this number of chunks") \ 1638 \ 1639 product(bool, CMSReplenishIntermediate, true, \ 1640 "Replenish all intermediate free-list caches") \ 1641 \ 1642 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1643 "When satisfying batched demand, split blocks from the " \ 1644 "IndexedFreeList whose size is a multiple of requested size") \ 1645 \ 1646 product(bool, CMSLoopWarn, false, \ 1647 "Warn in case of excessive CMS looping") \ 1648 \ 1649 develop(bool, CMSOverflowEarlyRestoration, false, \ 1650 "Whether preserved marks should be restored early") \ 1651 \ 1652 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1653 "Size of marking stack") \ 1654 \ 1655 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1656 "Max size of marking stack") \ 1657 \ 1658 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1659 "Whether we should simulate frequent marking stack / work queue" \ 1660 " overflow") \ 1661 \ 1662 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1663 "An `interval' counter that determines how frequently" \ 1664 " we simulate overflow; a smaller number increases frequency") \ 1665 \ 1666 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1667 "(Temporary, subject to experimentation)" \ 1668 "Maximum number of abortable preclean iterations, if > 0") \ 1669 \ 1670 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1671 "(Temporary, subject to experimentation)" \ 1672 "Maximum time in abortable preclean in ms") \ 1673 \ 1674 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1675 "(Temporary, subject to experimentation)" \ 1676 "Nominal minimum work per abortable preclean iteration") \ 1677 \ 1678 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1679 "(Temporary, subject to experimentation)" \ 1680 " Time that we sleep between iterations when not given" \ 1681 " enough work per iteration") \ 1682 \ 1683 product(uintx, CMSRescanMultiple, 32, \ 1684 "Size (in cards) of CMS parallel rescan task") \ 1685 \ 1686 product(uintx, CMSConcMarkMultiple, 32, \ 1687 "Size (in cards) of CMS concurrent MT marking task") \ 1688 \ 1689 product(bool, CMSAbortSemantics, false, \ 1690 "Whether abort-on-overflow semantics is implemented") \ 1691 \ 1692 product(bool, CMSParallelRemarkEnabled, true, \ 1693 "Whether parallel remark enabled (only if ParNewGC)") \ 1694 \ 1695 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1696 "Whether parallel remark of survivor space" \ 1697 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1698 \ 1699 product(bool, CMSPLABRecordAlways, true, \ 1700 "Whether to always record survivor space PLAB bdries" \ 1701 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1702 \ 1703 product(bool, CMSConcurrentMTEnabled, true, \ 1704 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1705 \ 1706 product(bool, CMSPrecleaningEnabled, true, \ 1707 "Whether concurrent precleaning enabled") \ 1708 \ 1709 product(uintx, CMSPrecleanIter, 3, \ 1710 "Maximum number of precleaning iteration passes") \ 1711 \ 1712 product(uintx, CMSPrecleanNumerator, 2, \ 1713 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1714 " ratio") \ 1715 \ 1716 product(uintx, CMSPrecleanDenominator, 3, \ 1717 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1718 " ratio") \ 1719 \ 1720 product(bool, CMSPrecleanRefLists1, true, \ 1721 "Preclean ref lists during (initial) preclean phase") \ 1722 \ 1723 product(bool, CMSPrecleanRefLists2, false, \ 1724 "Preclean ref lists during abortable preclean phase") \ 1725 \ 1726 product(bool, CMSPrecleanSurvivors1, false, \ 1727 "Preclean survivors during (initial) preclean phase") \ 1728 \ 1729 product(bool, CMSPrecleanSurvivors2, true, \ 1730 "Preclean survivors during abortable preclean phase") \ 1731 \ 1732 product(uintx, CMSPrecleanThreshold, 1000, \ 1733 "Don't re-iterate if #dirty cards less than this") \ 1734 \ 1735 product(bool, CMSCleanOnEnter, true, \ 1736 "Clean-on-enter optimization for reducing number of dirty cards") \ 1737 \ 1738 product(uintx, CMSRemarkVerifyVariant, 1, \ 1739 "Choose variant (1,2) of verification following remark") \ 1740 \ 1741 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1742 "If Eden used is below this value, don't try to schedule remark") \ 1743 \ 1744 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1745 "The Eden occupancy % at which to try and schedule remark pause") \ 1746 \ 1747 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1748 "Start sampling Eden top at least before yg occupancy reaches" \ 1749 " 1/<ratio> of the size at which we plan to schedule remark") \ 1750 \ 1751 product(uintx, CMSSamplingGrain, 16*K, \ 1752 "The minimum distance between eden samples for CMS (see above)") \ 1753 \ 1754 product(bool, CMSScavengeBeforeRemark, false, \ 1755 "Attempt scavenge before the CMS remark step") \ 1756 \ 1757 develop(bool, CMSTraceSweeper, false, \ 1758 "Trace some actions of the CMS sweeper") \ 1759 \ 1760 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1761 "Don't drain below this size per parallel worker/thief") \ 1762 \ 1763 manageable(intx, CMSWaitDuration, 2000, \ 1764 "Time in milliseconds that CMS thread waits for young GC") \ 1765 \ 1766 product(bool, CMSYield, true, \ 1767 "Yield between steps of concurrent mark & sweep") \ 1768 \ 1769 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1770 "Bitmap operations should process at most this many bits" \ 1771 "between yields") \ 1772 \ 1773 product(bool, CMSDumpAtPromotionFailure, false, \ 1774 "Dump useful information about the state of the CMS old " \ 1775 " generation upon a promotion failure.") \ 1776 \ 1777 product(bool, CMSPrintChunksInDump, false, \ 1778 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1779 " more detailed information about the free chunks.") \ 1780 \ 1781 product(bool, CMSPrintObjectsInDump, false, \ 1782 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1783 " more detailed information about the allocated objects.") \ 1784 \ 1785 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1786 "Verify that all refs across the FLS boundary " \ 1787 " are to valid objects") \ 1788 \ 1789 diagnostic(bool, FLSVerifyLists, false, \ 1790 "Do lots of (expensive) FreeListSpace verification") \ 1791 \ 1792 diagnostic(bool, FLSVerifyIndexTable, false, \ 1793 "Do lots of (expensive) FLS index table verification") \ 1794 \ 1795 develop(bool, FLSVerifyDictionary, false, \ 1796 "Do lots of (expensive) FLS dictionary verification") \ 1797 \ 1798 develop(bool, VerifyBlockOffsetArray, false, \ 1799 "Do (expensive!) block offset array verification") \ 1800 \ 1801 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1802 "Maintain _unallocated_block in BlockOffsetArray" \ 1803 " (currently applicable only to CMS collector)") \ 1804 \ 1805 develop(bool, TraceCMSState, false, \ 1806 "Trace the state of the CMS collection") \ 1807 \ 1808 product(intx, RefDiscoveryPolicy, 0, \ 1809 "Whether reference-based(0) or referent-based(1)") \ 1810 \ 1811 product(bool, ParallelRefProcEnabled, false, \ 1812 "Enable parallel reference processing whenever possible") \ 1813 \ 1814 product(bool, ParallelRefProcBalancingEnabled, true, \ 1815 "Enable balancing of reference processing queues") \ 1816 \ 1817 product(intx, CMSTriggerRatio, 80, \ 1818 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1819 "allocated before a CMS collection cycle commences") \ 1820 \ 1821 product(uintx, CMSBootstrapOccupancy, 50, \ 1822 "Percentage CMS generation occupancy at which to " \ 1823 "initiate CMS collection for bootstrapping collection stats") \ 1824 \ 1825 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1826 "Percentage CMS generation occupancy to start a CMS collection " \ 1827 "cycle. A negative value means that CMSTriggerRatio is used") \ 1828 \ 1829 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1830 "Percentage of the (entire) heap occupancy to start a " \ 1831 "concurrent GC cycle. It us used by GCs that trigger a " \ 1832 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1833 "not just one of the generations (e.g., G1). A value of 0 " \ 1834 "denotes 'do constant GC cycles'.") \ 1835 \ 1836 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1837 "Only use occupancy as a crierion for starting a CMS collection") \ 1838 \ 1839 product(intx, CMSIsTooFullPercentage, 98, \ 1840 "An absolute ceiling above which CMS will always consider the " \ 1841 "unloading of classes when class unloading is enabled") \ 1842 \ 1843 develop(bool, CMSTestInFreeList, false, \ 1844 "Check if the coalesced range is already in the " \ 1845 "free lists as claimed") \ 1846 \ 1847 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1848 "Check that all the garbage collected was returned to the " \ 1849 "free lists.") \ 1850 \ 1851 notproduct(bool, ScavengeALot, false, \ 1852 "Force scavenge at every Nth exit from the runtime system " \ 1853 "(N=ScavengeALotInterval)") \ 1854 \ 1855 develop(bool, FullGCALot, false, \ 1856 "Force full gc at every Nth exit from the runtime system " \ 1857 "(N=FullGCALotInterval)") \ 1858 \ 1859 notproduct(bool, GCALotAtAllSafepoints, false, \ 1860 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1861 \ 1862 product(bool, PrintPromotionFailure, false, \ 1863 "Print additional diagnostic information following " \ 1864 " promotion failure") \ 1865 \ 1866 notproduct(bool, PromotionFailureALot, false, \ 1867 "Use promotion failure handling on every youngest generation " \ 1868 "collection") \ 1869 \ 1870 develop(uintx, PromotionFailureALotCount, 1000, \ 1871 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1872 "refill attempts (ParNew) or promotion attempts " \ 1873 "(other young collectors) ") \ 1874 \ 1875 develop(uintx, PromotionFailureALotInterval, 5, \ 1876 "Total collections between promotion failures alot") \ 1877 \ 1878 experimental(intx, WorkStealingSleepMillis, 1, \ 1879 "Sleep time when sleep is used for yields") \ 1880 \ 1881 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1882 "Number of yields before a sleep is done during workstealing") \ 1883 \ 1884 experimental(uintx, WorkStealingHardSpins, 4096, \ 1885 "Number of iterations in a spin loop between checks on " \ 1886 "time out of hard spin") \ 1887 \ 1888 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1889 "Ratio of hard spins to calls to yield") \ 1890 \ 1891 develop(uintx, ObjArrayMarkingStride, 512, \ 1892 "Number of ObjArray elements to push onto the marking stack" \ 1893 "before pushing a continuation entry") \ 1894 \ 1895 develop(bool, MetadataAllocationFailALot, false, \ 1896 "Fail metadata allocations at intervals controlled by " \ 1897 "MetadataAllocationFailALotInterval") \ 1898 \ 1899 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1900 "metadata allocation failure alot interval") \ 1901 \ 1902 develop(bool, MetaDataDeallocateALot, false, \ 1903 "Deallocation bunches of metadata at intervals controlled by " \ 1904 "MetaDataAllocateALotInterval") \ 1905 \ 1906 develop(uintx, MetaDataDeallocateALotInterval, 100, \ 1907 "Metadata deallocation alot interval") \ 1908 \ 1909 develop(bool, TraceMetadataChunkAllocation, false, \ 1910 "Trace chunk metadata allocations") \ 1911 \ 1912 product(bool, TraceMetadataHumongousAllocation, false, \ 1913 "Trace humongous metadata allocations") \ 1914 \ 1915 develop(bool, TraceMetavirtualspaceAllocation, false, \ 1916 "Trace virtual space metadata allocations") \ 1917 \ 1918 notproduct(bool, ExecuteInternalVMTests, false, \ 1919 "Enable execution of internal VM tests.") \ 1920 \ 1921 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1922 \ 1923 product_pd(bool, ResizeTLAB, \ 1924 "Dynamically resize tlab size for threads") \ 1925 \ 1926 product(bool, ZeroTLAB, false, \ 1927 "Zero out the newly created TLAB") \ 1928 \ 1929 product(bool, FastTLABRefill, true, \ 1930 "Use fast TLAB refill code") \ 1931 \ 1932 product(bool, PrintTLAB, false, \ 1933 "Print various TLAB related information") \ 1934 \ 1935 product(bool, TLABStats, true, \ 1936 "Print various TLAB related information") \ 1937 \ 1938 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 1939 "Enable LowMemoryProtection")) \ 1940 \ 1941 product_pd(bool, NeverActAsServerClassMachine, \ 1942 "Never act like a server-class machine") \ 1943 \ 1944 product(bool, AlwaysActAsServerClassMachine, false, \ 1945 "Always act like a server-class machine") \ 1946 \ 1947 product_pd(uint64_t, MaxRAM, \ 1948 "Real memory size (in bytes) used to set maximum heap size") \ 1949 \ 1950 product(uintx, ErgoHeapSizeLimit, 0, \ 1951 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1952 "MaxRAM / MaxRAMFraction") \ 1953 \ 1954 product(uintx, MaxRAMFraction, 4, \ 1955 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1956 "size") \ 1957 \ 1958 product(uintx, DefaultMaxRAMFraction, 4, \ 1959 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1960 "size; deprecated: to be renamed to MaxRAMFraction") \ 1961 \ 1962 product(uintx, MinRAMFraction, 2, \ 1963 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1964 "size on systems with small physical memory size") \ 1965 \ 1966 product(uintx, InitialRAMFraction, 64, \ 1967 "Fraction (1/n) of real memory used for initial heap size") \ 1968 \ 1969 product(bool, UseAutoGCSelectPolicy, false, \ 1970 "Use automatic collection selection policy") \ 1971 \ 1972 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1973 "Automatic GC selection pause threshhold in ms") \ 1974 \ 1975 product(bool, UseAdaptiveSizePolicy, true, \ 1976 "Use adaptive generation sizing policies") \ 1977 \ 1978 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1979 "Use adaptive survivor sizing policies") \ 1980 \ 1981 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1982 "Use adaptive young-old sizing policies at minor collections") \ 1983 \ 1984 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1985 "Use adaptive young-old sizing policies at major collections") \ 1986 \ 1987 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1988 "Use statistics from System.GC for adaptive size policy") \ 1989 \ 1990 product(bool, UseAdaptiveGCBoundary, false, \ 1991 "Allow young-old boundary to move") \ 1992 \ 1993 develop(bool, TraceAdaptiveGCBoundary, false, \ 1994 "Trace young-old boundary moves") \ 1995 \ 1996 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1997 "Resize the virtual spaces of the young or old generations") \ 1998 \ 1999 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2000 "Policy for changeing generation size for throughput goals") \ 2001 \ 2002 product(uintx, AdaptiveSizePausePolicy, 0, \ 2003 "Policy for changing generation size for pause goals") \ 2004 \ 2005 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2006 "Adjust tenured generation to achive a minor pause goal") \ 2007 \ 2008 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2009 "Adjust young generation to achive a major pause goal") \ 2010 \ 2011 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2012 "Number of steps where heuristics is used before data is used") \ 2013 \ 2014 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2015 "Number of collections before the adaptive sizing is started") \ 2016 \ 2017 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2018 "Collecton interval for printing information; zero => never") \ 2019 \ 2020 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2021 "Use adaptive minimum footprint as a goal") \ 2022 \ 2023 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2024 "Weight given to exponential resizing, between 0 and 100") \ 2025 \ 2026 product(uintx, AdaptiveTimeWeight, 25, \ 2027 "Weight given to time in adaptive policy, between 0 and 100") \ 2028 \ 2029 product(uintx, PausePadding, 1, \ 2030 "How much buffer to keep for pause time") \ 2031 \ 2032 product(uintx, PromotedPadding, 3, \ 2033 "How much buffer to keep for promotion failure") \ 2034 \ 2035 product(uintx, SurvivorPadding, 3, \ 2036 "How much buffer to keep for survivor overflow") \ 2037 \ 2038 product(uintx, ThresholdTolerance, 10, \ 2039 "Allowed collection cost difference between generations") \ 2040 \ 2041 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2042 "If collection costs are within margin, reduce both by full " \ 2043 "delta") \ 2044 \ 2045 product(uintx, YoungGenerationSizeIncrement, 20, \ 2046 "Adaptive size percentage change in young generation") \ 2047 \ 2048 product(uintx, YoungGenerationSizeSupplement, 80, \ 2049 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2050 \ 2051 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2052 "Decay factor to YoungedGenerationSizeSupplement") \ 2053 \ 2054 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2055 "Adaptive size percentage change in tenured generation") \ 2056 \ 2057 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2058 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2059 \ 2060 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2061 "Decay factor to TenuredGenerationSizeIncrement") \ 2062 \ 2063 product(uintx, MaxGCPauseMillis, max_uintx, \ 2064 "Adaptive size policy maximum GC pause time goal in msec, " \ 2065 "or (G1 Only) the max. GC time per MMU time slice") \ 2066 \ 2067 product(uintx, GCPauseIntervalMillis, 0, \ 2068 "Time slice for MMU specification") \ 2069 \ 2070 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2071 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2072 \ 2073 product(uintx, GCTimeRatio, 99, \ 2074 "Adaptive size policy application time to GC time ratio") \ 2075 \ 2076 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2077 "Adaptive size scale down factor for shrinking") \ 2078 \ 2079 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2080 "Adaptive size decays the major cost for long major intervals") \ 2081 \ 2082 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2083 "Time scale over which major costs decay") \ 2084 \ 2085 product(uintx, MinSurvivorRatio, 3, \ 2086 "Minimum ratio of young generation/survivor space size") \ 2087 \ 2088 product(uintx, InitialSurvivorRatio, 8, \ 2089 "Initial ratio of eden/survivor space size") \ 2090 \ 2091 product(uintx, BaseFootPrintEstimate, 256*M, \ 2092 "Estimate of footprint other than Java Heap") \ 2093 \ 2094 product(bool, UseGCOverheadLimit, true, \ 2095 "Use policy to limit of proportion of time spent in GC " \ 2096 "before an OutOfMemory error is thrown") \ 2097 \ 2098 product(uintx, GCTimeLimit, 98, \ 2099 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2100 "error is thrown (used with GCHeapFreeLimit)") \ 2101 \ 2102 product(uintx, GCHeapFreeLimit, 2, \ 2103 "Minimum percentage of free space after a full GC before an " \ 2104 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2105 \ 2106 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2107 "Number of consecutive collections before gc time limit fires") \ 2108 \ 2109 product(bool, PrintAdaptiveSizePolicy, false, \ 2110 "Print information about AdaptiveSizePolicy") \ 2111 \ 2112 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2113 "How far ahead to prefetch destination area (<= 0 means off)") \ 2114 \ 2115 product(intx, PrefetchScanIntervalInBytes, -1, \ 2116 "How far ahead to prefetch scan area (<= 0 means off)") \ 2117 \ 2118 product(intx, PrefetchFieldsAhead, -1, \ 2119 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2120 \ 2121 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2122 "Verify system before exiting") \ 2123 \ 2124 diagnostic(bool, VerifyBeforeGC, false, \ 2125 "Verify memory system before GC") \ 2126 \ 2127 diagnostic(bool, VerifyAfterGC, false, \ 2128 "Verify memory system after GC") \ 2129 \ 2130 diagnostic(bool, VerifyDuringGC, false, \ 2131 "Verify memory system during GC (between phases)") \ 2132 \ 2133 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2134 "Enable parallel memory system verification") \ 2135 \ 2136 diagnostic(bool, DeferInitialCardMark, false, \ 2137 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2138 "may arise from new_pre_store_barrier") \ 2139 \ 2140 diagnostic(bool, VerifyRememberedSets, false, \ 2141 "Verify GC remembered sets") \ 2142 \ 2143 diagnostic(bool, VerifyObjectStartArray, true, \ 2144 "Verify GC object start array if verify before/after") \ 2145 \ 2146 product(bool, DisableExplicitGC, false, \ 2147 "Tells whether calling System.gc() does a full GC") \ 2148 \ 2149 notproduct(bool, CheckMemoryInitialization, false, \ 2150 "Checks memory initialization") \ 2151 \ 2152 product(bool, CollectGen0First, false, \ 2153 "Collect youngest generation before each full GC") \ 2154 \ 2155 diagnostic(bool, BindCMSThreadToCPU, false, \ 2156 "Bind CMS Thread to CPU if possible") \ 2157 \ 2158 diagnostic(uintx, CPUForCMSThread, 0, \ 2159 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2160 \ 2161 product(bool, BindGCTaskThreadsToCPUs, false, \ 2162 "Bind GCTaskThreads to CPUs if possible") \ 2163 \ 2164 product(bool, UseGCTaskAffinity, false, \ 2165 "Use worker affinity when asking for GCTasks") \ 2166 \ 2167 product(uintx, ProcessDistributionStride, 4, \ 2168 "Stride through processors when distributing processes") \ 2169 \ 2170 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2171 "number of times the coordinator GC thread will sleep while " \ 2172 "yielding before giving up and resuming GC") \ 2173 \ 2174 product(uintx, CMSYieldSleepCount, 0, \ 2175 "number of times a GC thread (minus the coordinator) " \ 2176 "will sleep while yielding before giving up and resuming GC") \ 2177 \ 2178 /* gc tracing */ \ 2179 manageable(bool, PrintGC, false, \ 2180 "Print message at garbage collect") \ 2181 \ 2182 manageable(bool, PrintGCDetails, false, \ 2183 "Print more details at garbage collect") \ 2184 \ 2185 manageable(bool, PrintGCDateStamps, false, \ 2186 "Print date stamps at garbage collect") \ 2187 \ 2188 manageable(bool, PrintGCTimeStamps, false, \ 2189 "Print timestamps at garbage collect") \ 2190 \ 2191 product(bool, PrintGCTaskTimeStamps, false, \ 2192 "Print timestamps for individual gc worker thread tasks") \ 2193 \ 2194 develop(intx, ConcGCYieldTimeout, 0, \ 2195 "If non-zero, assert that GC threads yield within this # of ms.") \ 2196 \ 2197 notproduct(bool, TraceMarkSweep, false, \ 2198 "Trace mark sweep") \ 2199 \ 2200 product(bool, PrintReferenceGC, false, \ 2201 "Print times spent handling reference objects during GC " \ 2202 " (enabled only when PrintGCDetails)") \ 2203 \ 2204 develop(bool, TraceReferenceGC, false, \ 2205 "Trace handling of soft/weak/final/phantom references") \ 2206 \ 2207 develop(bool, TraceFinalizerRegistration, false, \ 2208 "Trace registration of final references") \ 2209 \ 2210 notproduct(bool, TraceScavenge, false, \ 2211 "Trace scavenge") \ 2212 \ 2213 product_rw(bool, TraceClassLoading, false, \ 2214 "Trace all classes loaded") \ 2215 \ 2216 product(bool, TraceClassLoadingPreorder, false, \ 2217 "Trace all classes loaded in order referenced (not loaded)") \ 2218 \ 2219 product_rw(bool, TraceClassUnloading, false, \ 2220 "Trace unloading of classes") \ 2221 \ 2222 product_rw(bool, TraceLoaderConstraints, false, \ 2223 "Trace loader constraints") \ 2224 \ 2225 develop(bool, TraceClassLoaderData, false, \ 2226 "Trace class loader loader_data lifetime") \ 2227 \ 2228 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2229 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2230 "Initial size of the boot class loader data metaspace") \ 2231 \ 2232 product(bool, TraceGen0Time, false, \ 2233 "Trace accumulated time for Gen 0 collection") \ 2234 \ 2235 product(bool, TraceGen1Time, false, \ 2236 "Trace accumulated time for Gen 1 collection") \ 2237 \ 2238 product(bool, PrintTenuringDistribution, false, \ 2239 "Print tenuring age information") \ 2240 \ 2241 product_rw(bool, PrintHeapAtGC, false, \ 2242 "Print heap layout before and after each GC") \ 2243 \ 2244 product_rw(bool, PrintHeapAtGCExtended, false, \ 2245 "Prints extended information about the layout of the heap " \ 2246 "when -XX:+PrintHeapAtGC is set") \ 2247 \ 2248 product(bool, PrintHeapAtSIGBREAK, true, \ 2249 "Print heap layout in response to SIGBREAK") \ 2250 \ 2251 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2252 "Print a class histogram before any major stop-world GC") \ 2253 \ 2254 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2255 "Print a class histogram after any major stop-world GC") \ 2256 \ 2257 manageable(bool, PrintClassHistogram, false, \ 2258 "Print a histogram of class instances") \ 2259 \ 2260 develop(bool, TraceWorkGang, false, \ 2261 "Trace activities of work gangs") \ 2262 \ 2263 product(bool, TraceParallelOldGCTasks, false, \ 2264 "Trace multithreaded GC activity") \ 2265 \ 2266 develop(bool, TraceBlockOffsetTable, false, \ 2267 "Print BlockOffsetTable maps") \ 2268 \ 2269 develop(bool, TraceCardTableModRefBS, false, \ 2270 "Print CardTableModRefBS maps") \ 2271 \ 2272 develop(bool, TraceGCTaskManager, false, \ 2273 "Trace actions of the GC task manager") \ 2274 \ 2275 develop(bool, TraceGCTaskQueue, false, \ 2276 "Trace actions of the GC task queues") \ 2277 \ 2278 diagnostic(bool, TraceGCTaskThread, false, \ 2279 "Trace actions of the GC task threads") \ 2280 \ 2281 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2282 "Print the time taken by each parallel old gc phase." \ 2283 "PrintGCDetails must also be enabled.") \ 2284 \ 2285 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2286 "Trace parallel old gc marking phase") \ 2287 \ 2288 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2289 "Trace parallel old gc summary phase") \ 2290 \ 2291 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2292 "Trace parallel old gc compaction phase") \ 2293 \ 2294 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2295 "Trace parallel old gc dense prefix computation") \ 2296 \ 2297 develop(bool, IgnoreLibthreadGPFault, false, \ 2298 "Suppress workaround for libthread GP fault") \ 2299 \ 2300 product(bool, PrintJNIGCStalls, false, \ 2301 "Print diagnostic message when GC is stalled" \ 2302 "by JNI critical section") \ 2303 \ 2304 /* GC log rotation setting */ \ 2305 \ 2306 product(bool, UseGCLogFileRotation, false, \ 2307 "Prevent large gclog file for long running app. " \ 2308 "Requires -Xloggc:<filename>") \ 2309 \ 2310 product(uintx, NumberOfGCLogFiles, 0, \ 2311 "Number of gclog files in rotation, " \ 2312 "Default: 0, no rotation") \ 2313 \ 2314 product(uintx, GCLogFileSize, 0, \ 2315 "GC log file size, Default: 0 bytes, no rotation " \ 2316 "Only valid with UseGCLogFileRotation") \ 2317 \ 2318 /* JVMTI heap profiling */ \ 2319 \ 2320 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2321 "Trace JVMTI object tagging calls") \ 2322 \ 2323 diagnostic(bool, VerifyBeforeIteration, false, \ 2324 "Verify memory system before JVMTI iteration") \ 2325 \ 2326 /* compiler interface */ \ 2327 \ 2328 develop(bool, CIPrintCompilerName, false, \ 2329 "when CIPrint is active, print the name of the active compiler") \ 2330 \ 2331 develop(bool, CIPrintCompileQueue, false, \ 2332 "display the contents of the compile queue whenever a " \ 2333 "compilation is enqueued") \ 2334 \ 2335 develop(bool, CIPrintRequests, false, \ 2336 "display every request for compilation") \ 2337 \ 2338 product(bool, CITime, false, \ 2339 "collect timing information for compilation") \ 2340 \ 2341 develop(bool, CITimeEach, false, \ 2342 "display timing information after each successful compilation") \ 2343 \ 2344 develop(bool, CICountOSR, false, \ 2345 "use a separate counter when assigning ids to osr compilations") \ 2346 \ 2347 develop(bool, CICompileNatives, true, \ 2348 "compile native methods if supported by the compiler") \ 2349 \ 2350 develop_pd(bool, CICompileOSR, \ 2351 "compile on stack replacement methods if supported by the " \ 2352 "compiler") \ 2353 \ 2354 develop(bool, CIPrintMethodCodes, false, \ 2355 "print method bytecodes of the compiled code") \ 2356 \ 2357 develop(bool, CIPrintTypeFlow, false, \ 2358 "print the results of ciTypeFlow analysis") \ 2359 \ 2360 develop(bool, CITraceTypeFlow, false, \ 2361 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2362 \ 2363 develop(intx, OSROnlyBCI, -1, \ 2364 "OSR only at this bci. Negative values mean exclude that bci") \ 2365 \ 2366 /* compiler */ \ 2367 \ 2368 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2369 "Number of compiler threads to run") \ 2370 \ 2371 product(intx, CompilationPolicyChoice, 0, \ 2372 "which compilation policy (0/1)") \ 2373 \ 2374 develop(bool, UseStackBanging, true, \ 2375 "use stack banging for stack overflow checks (required for " \ 2376 "proper StackOverflow handling; disable only to measure cost " \ 2377 "of stackbanging)") \ 2378 \ 2379 develop(bool, UseStrictFP, true, \ 2380 "use strict fp if modifier strictfp is set") \ 2381 \ 2382 develop(bool, GenerateSynchronizationCode, true, \ 2383 "generate locking/unlocking code for synchronized methods and " \ 2384 "monitors") \ 2385 \ 2386 develop(bool, GenerateCompilerNullChecks, true, \ 2387 "Generate explicit null checks for loads/stores/calls") \ 2388 \ 2389 develop(bool, GenerateRangeChecks, true, \ 2390 "Generate range checks for array accesses") \ 2391 \ 2392 develop_pd(bool, ImplicitNullChecks, \ 2393 "generate code for implicit null checks") \ 2394 \ 2395 product(bool, PrintSafepointStatistics, false, \ 2396 "print statistics about safepoint synchronization") \ 2397 \ 2398 product(intx, PrintSafepointStatisticsCount, 300, \ 2399 "total number of safepoint statistics collected " \ 2400 "before printing them out") \ 2401 \ 2402 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2403 "print safepoint statistics only when safepoint takes" \ 2404 " more than PrintSafepointSatisticsTimeout in millis") \ 2405 \ 2406 product(bool, TraceSafepointCleanupTime, false, \ 2407 "print the break down of clean up tasks performed during" \ 2408 " safepoint") \ 2409 \ 2410 product(bool, Inline, true, \ 2411 "enable inlining") \ 2412 \ 2413 product(bool, ClipInlining, true, \ 2414 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2415 \ 2416 develop(bool, UseCHA, true, \ 2417 "enable CHA") \ 2418 \ 2419 product(bool, UseTypeProfile, true, \ 2420 "Check interpreter profile for historically monomorphic calls") \ 2421 \ 2422 notproduct(bool, TimeCompiler, false, \ 2423 "time the compiler") \ 2424 \ 2425 diagnostic(bool, PrintInlining, false, \ 2426 "prints inlining optimizations") \ 2427 \ 2428 product(bool, UsePopCountInstruction, false, \ 2429 "Use population count instruction") \ 2430 \ 2431 develop(bool, EagerInitialization, false, \ 2432 "Eagerly initialize classes if possible") \ 2433 \ 2434 develop(bool, TraceMethodReplacement, false, \ 2435 "Print when methods are replaced do to recompilation") \ 2436 \ 2437 develop(bool, PrintMethodFlushing, false, \ 2438 "print the nmethods being flushed") \ 2439 \ 2440 develop(bool, UseRelocIndex, false, \ 2441 "use an index to speed random access to relocations") \ 2442 \ 2443 develop(bool, StressCodeBuffers, false, \ 2444 "Exercise code buffer expansion and other rare state changes") \ 2445 \ 2446 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2447 "Generate extra debugging info for non-safepoints in nmethods") \ 2448 \ 2449 product(bool, PrintVMOptions, false, \ 2450 "Print flags that appeared on the command line") \ 2451 \ 2452 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2453 "Ignore unrecognized VM options") \ 2454 \ 2455 product(bool, PrintCommandLineFlags, false, \ 2456 "Print flags specified on command line or set by ergonomics") \ 2457 \ 2458 product(bool, PrintFlagsInitial, false, \ 2459 "Print all VM flags before argument processing and exit VM") \ 2460 \ 2461 product(bool, PrintFlagsFinal, false, \ 2462 "Print all VM flags after argument and ergonomic processing") \ 2463 \ 2464 notproduct(bool, PrintFlagsWithComments, false, \ 2465 "Print all VM flags with default values and descriptions and exit")\ 2466 \ 2467 diagnostic(bool, SerializeVMOutput, true, \ 2468 "Use a mutex to serialize output to tty and hotspot.log") \ 2469 \ 2470 diagnostic(bool, DisplayVMOutput, true, \ 2471 "Display all VM output on the tty, independently of LogVMOutput") \ 2472 \ 2473 diagnostic(bool, LogVMOutput, trueInDebug, \ 2474 "Save VM output to hotspot.log, or to LogFile") \ 2475 \ 2476 diagnostic(ccstr, LogFile, NULL, \ 2477 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2478 \ 2479 product(ccstr, ErrorFile, NULL, \ 2480 "If an error occurs, save the error data to this file " \ 2481 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2482 \ 2483 product(bool, DisplayVMOutputToStderr, false, \ 2484 "If DisplayVMOutput is true, display all VM output to stderr") \ 2485 \ 2486 product(bool, DisplayVMOutputToStdout, false, \ 2487 "If DisplayVMOutput is true, display all VM output to stdout") \ 2488 \ 2489 product(bool, UseHeavyMonitors, false, \ 2490 "use heavyweight instead of lightweight Java monitors") \ 2491 \ 2492 product(bool, PrintStringTableStatistics, false, \ 2493 "print statistics about the StringTable and SymbolTable") \ 2494 \ 2495 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2496 "print histogram of the symbol table") \ 2497 \ 2498 notproduct(bool, ExitVMOnVerifyError, false, \ 2499 "standard exit from VM if bytecode verify error " \ 2500 "(only in debug mode)") \ 2501 \ 2502 notproduct(ccstr, AbortVMOnException, NULL, \ 2503 "Call fatal if this exception is thrown. Example: " \ 2504 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2505 \ 2506 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2507 "Call fatal if the exception pointed by AbortVMOnException " \ 2508 "has this message.") \ 2509 \ 2510 develop(bool, DebugVtables, false, \ 2511 "add debugging code to vtable dispatch") \ 2512 \ 2513 develop(bool, PrintVtables, false, \ 2514 "print vtables when printing klass") \ 2515 \ 2516 notproduct(bool, PrintVtableStats, false, \ 2517 "print vtables stats at end of run") \ 2518 \ 2519 develop(bool, TraceCreateZombies, false, \ 2520 "trace creation of zombie nmethods") \ 2521 \ 2522 notproduct(bool, IgnoreLockingAssertions, false, \ 2523 "disable locking assertions (for speed)") \ 2524 \ 2525 product(bool, RangeCheckElimination, true, \ 2526 "Split loop iterations to eliminate range checks") \ 2527 \ 2528 develop_pd(bool, UncommonNullCast, \ 2529 "track occurrences of null in casts; adjust compiler tactics") \ 2530 \ 2531 develop(bool, TypeProfileCasts, true, \ 2532 "treat casts like calls for purposes of type profiling") \ 2533 \ 2534 develop(bool, DelayCompilationDuringStartup, true, \ 2535 "Delay invoking the compiler until main application class is " \ 2536 "loaded") \ 2537 \ 2538 develop(bool, CompileTheWorld, false, \ 2539 "Compile all methods in all classes in bootstrap class path " \ 2540 "(stress test)") \ 2541 \ 2542 develop(bool, CompileTheWorldPreloadClasses, true, \ 2543 "Preload all classes used by a class before start loading") \ 2544 \ 2545 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2546 "Force a safepoint every n compiles so sweeper can keep up") \ 2547 \ 2548 develop(bool, FillDelaySlots, true, \ 2549 "Fill delay slots (on SPARC only)") \ 2550 \ 2551 develop(bool, TimeLivenessAnalysis, false, \ 2552 "Time computation of bytecode liveness analysis") \ 2553 \ 2554 develop(bool, TraceLivenessGen, false, \ 2555 "Trace the generation of liveness analysis information") \ 2556 \ 2557 notproduct(bool, TraceLivenessQuery, false, \ 2558 "Trace queries of liveness analysis information") \ 2559 \ 2560 notproduct(bool, CollectIndexSetStatistics, false, \ 2561 "Collect information about IndexSets") \ 2562 \ 2563 develop(bool, UseLoopSafepoints, true, \ 2564 "Generate Safepoint nodes in every loop") \ 2565 \ 2566 develop(intx, FastAllocateSizeLimit, 128*K, \ 2567 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2568 "Inline allocations larger than this in doublewords must go slow")\ 2569 \ 2570 product(bool, AggressiveOpts, false, \ 2571 "Enable aggressive optimizations - see arguments.cpp") \ 2572 \ 2573 product(bool, UseStringCache, false, \ 2574 "Enable String cache capabilities on String.java") \ 2575 \ 2576 /* statistics */ \ 2577 develop(bool, CountCompiledCalls, false, \ 2578 "counts method invocations") \ 2579 \ 2580 notproduct(bool, CountRuntimeCalls, false, \ 2581 "counts VM runtime calls") \ 2582 \ 2583 develop(bool, CountJNICalls, false, \ 2584 "counts jni method invocations") \ 2585 \ 2586 notproduct(bool, CountJVMCalls, false, \ 2587 "counts jvm method invocations") \ 2588 \ 2589 notproduct(bool, CountRemovableExceptions, false, \ 2590 "count exceptions that could be replaced by branches due to " \ 2591 "inlining") \ 2592 \ 2593 notproduct(bool, ICMissHistogram, false, \ 2594 "produce histogram of IC misses") \ 2595 \ 2596 notproduct(bool, PrintClassStatistics, false, \ 2597 "prints class statistics at end of run") \ 2598 \ 2599 notproduct(bool, PrintMethodStatistics, false, \ 2600 "prints method statistics at end of run") \ 2601 \ 2602 /* interpreter */ \ 2603 develop(bool, ClearInterpreterLocals, false, \ 2604 "Always clear local variables of interpreter activations upon " \ 2605 "entry") \ 2606 \ 2607 product_pd(bool, RewriteBytecodes, \ 2608 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2609 \ 2610 product_pd(bool, RewriteFrequentPairs, \ 2611 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2612 \ 2613 diagnostic(bool, PrintInterpreter, false, \ 2614 "Prints the generated interpreter code") \ 2615 \ 2616 product(bool, UseInterpreter, true, \ 2617 "Use interpreter for non-compiled methods") \ 2618 \ 2619 develop(bool, UseFastSignatureHandlers, true, \ 2620 "Use fast signature handlers for native calls") \ 2621 \ 2622 product(bool, UseLoopCounter, true, \ 2623 "Increment invocation counter on backward branch") \ 2624 \ 2625 product(bool, UseFastEmptyMethods, true, \ 2626 "Use fast method entry code for empty methods") \ 2627 \ 2628 product(bool, UseFastAccessorMethods, true, \ 2629 "Use fast method entry code for accessor methods") \ 2630 \ 2631 product_pd(bool, UseOnStackReplacement, \ 2632 "Use on stack replacement, calls runtime if invoc. counter " \ 2633 "overflows in loop") \ 2634 \ 2635 notproduct(bool, TraceOnStackReplacement, false, \ 2636 "Trace on stack replacement") \ 2637 \ 2638 product_pd(bool, PreferInterpreterNativeStubs, \ 2639 "Use always interpreter stubs for native methods invoked via " \ 2640 "interpreter") \ 2641 \ 2642 develop(bool, CountBytecodes, false, \ 2643 "Count number of bytecodes executed") \ 2644 \ 2645 develop(bool, PrintBytecodeHistogram, false, \ 2646 "Print histogram of the executed bytecodes") \ 2647 \ 2648 develop(bool, PrintBytecodePairHistogram, false, \ 2649 "Print histogram of the executed bytecode pairs") \ 2650 \ 2651 diagnostic(bool, PrintSignatureHandlers, false, \ 2652 "Print code generated for native method signature handlers") \ 2653 \ 2654 develop(bool, VerifyOops, false, \ 2655 "Do plausibility checks for oops") \ 2656 \ 2657 develop(bool, CheckUnhandledOops, false, \ 2658 "Check for unhandled oops in VM code") \ 2659 \ 2660 develop(bool, VerifyJNIFields, trueInDebug, \ 2661 "Verify jfieldIDs for instance fields") \ 2662 \ 2663 notproduct(bool, VerifyJNIEnvThread, false, \ 2664 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2665 "from JNI") \ 2666 \ 2667 develop(bool, VerifyFPU, false, \ 2668 "Verify FPU state (check for NaN's, etc.)") \ 2669 \ 2670 develop(bool, VerifyThread, false, \ 2671 "Watch the thread register for corruption (SPARC only)") \ 2672 \ 2673 develop(bool, VerifyActivationFrameSize, false, \ 2674 "Verify that activation frame didn't become smaller than its " \ 2675 "minimal size") \ 2676 \ 2677 develop(bool, TraceFrequencyInlining, false, \ 2678 "Trace frequency based inlining") \ 2679 \ 2680 develop_pd(bool, InlineIntrinsics, \ 2681 "Inline intrinsics that can be statically resolved") \ 2682 \ 2683 product_pd(bool, ProfileInterpreter, \ 2684 "Profile at the bytecode level during interpretation") \ 2685 \ 2686 develop_pd(bool, ProfileTraps, \ 2687 "Profile deoptimization traps at the bytecode level") \ 2688 \ 2689 product(intx, ProfileMaturityPercentage, 20, \ 2690 "number of method invocations/branches (expressed as % of " \ 2691 "CompileThreshold) before using the method's profile") \ 2692 \ 2693 develop(bool, PrintMethodData, false, \ 2694 "Print the results of +ProfileInterpreter at end of run") \ 2695 \ 2696 develop(bool, VerifyDataPointer, trueInDebug, \ 2697 "Verify the method data pointer during interpreter profiling") \ 2698 \ 2699 develop(bool, VerifyCompiledCode, false, \ 2700 "Include miscellaneous runtime verifications in nmethod code; " \ 2701 "default off because it disturbs nmethod size heuristics") \ 2702 \ 2703 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2704 "Manually make GC thread crash then dump java stack trace; " \ 2705 "Test only") \ 2706 \ 2707 /* compilation */ \ 2708 product(bool, UseCompiler, true, \ 2709 "use compilation") \ 2710 \ 2711 develop(bool, TraceCompilationPolicy, false, \ 2712 "Trace compilation policy") \ 2713 \ 2714 develop(bool, TimeCompilationPolicy, false, \ 2715 "Time the compilation policy") \ 2716 \ 2717 product(bool, UseCounterDecay, true, \ 2718 "adjust recompilation counters") \ 2719 \ 2720 develop(intx, CounterHalfLifeTime, 30, \ 2721 "half-life time of invocation counters (in secs)") \ 2722 \ 2723 develop(intx, CounterDecayMinIntervalLength, 500, \ 2724 "Min. ms. between invocation of CounterDecay") \ 2725 \ 2726 product(bool, AlwaysCompileLoopMethods, false, \ 2727 "when using recompilation, never interpret methods " \ 2728 "containing loops") \ 2729 \ 2730 product(bool, DontCompileHugeMethods, true, \ 2731 "don't compile methods > HugeMethodLimit") \ 2732 \ 2733 /* Bytecode escape analysis estimation. */ \ 2734 product(bool, EstimateArgEscape, true, \ 2735 "Analyze bytecodes to estimate escape state of arguments") \ 2736 \ 2737 product(intx, BCEATraceLevel, 0, \ 2738 "How much tracing to do of bytecode escape analysis estimates") \ 2739 \ 2740 product(intx, MaxBCEAEstimateLevel, 5, \ 2741 "Maximum number of nested calls that are analyzed by BC EA.") \ 2742 \ 2743 product(intx, MaxBCEAEstimateSize, 150, \ 2744 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2745 \ 2746 product(intx, AllocatePrefetchStyle, 1, \ 2747 "0 = no prefetch, " \ 2748 "1 = prefetch instructions for each allocation, " \ 2749 "2 = use TLAB watermark to gate allocation prefetch, " \ 2750 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2751 \ 2752 product(intx, AllocatePrefetchDistance, -1, \ 2753 "Distance to prefetch ahead of allocation pointer") \ 2754 \ 2755 product(intx, AllocatePrefetchLines, 3, \ 2756 "Number of lines to prefetch ahead of array allocation pointer") \ 2757 \ 2758 product(intx, AllocateInstancePrefetchLines, 1, \ 2759 "Number of lines to prefetch ahead of instance allocation pointer") \ 2760 \ 2761 product(intx, AllocatePrefetchStepSize, 16, \ 2762 "Step size in bytes of sequential prefetch instructions") \ 2763 \ 2764 product(intx, AllocatePrefetchInstr, 0, \ 2765 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2766 \ 2767 /* deoptimization */ \ 2768 develop(bool, TraceDeoptimization, false, \ 2769 "Trace deoptimization") \ 2770 \ 2771 develop(bool, DebugDeoptimization, false, \ 2772 "Tracing various information while debugging deoptimization") \ 2773 \ 2774 product(intx, SelfDestructTimer, 0, \ 2775 "Will cause VM to terminate after a given time (in minutes) " \ 2776 "(0 means off)") \ 2777 \ 2778 product(intx, MaxJavaStackTraceDepth, 1024, \ 2779 "Max. no. of lines in the stack trace for Java exceptions " \ 2780 "(0 means all)") \ 2781 \ 2782 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2783 "Guarantee a safepoint (at least) every so many milliseconds " \ 2784 "(0 means none)")) \ 2785 \ 2786 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2787 "Guarantee a safepoint (at least) every so many milliseconds " \ 2788 "(0 means none)")) \ 2789 \ 2790 product(intx, SafepointTimeoutDelay, 10000, \ 2791 "Delay in milliseconds for option SafepointTimeout") \ 2792 \ 2793 product(intx, NmethodSweepFraction, 16, \ 2794 "Number of invocations of sweeper to cover all nmethods") \ 2795 \ 2796 product(intx, NmethodSweepCheckInterval, 5, \ 2797 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2798 \ 2799 notproduct(bool, LogSweeper, false, \ 2800 "Keep a ring buffer of sweeper activity") \ 2801 \ 2802 notproduct(intx, SweeperLogEntries, 1024, \ 2803 "Number of records in the ring buffer of sweeper activity") \ 2804 \ 2805 notproduct(intx, MemProfilingInterval, 500, \ 2806 "Time between each invocation of the MemProfiler") \ 2807 \ 2808 develop(intx, MallocCatchPtr, -1, \ 2809 "Hit breakpoint when mallocing/freeing this pointer") \ 2810 \ 2811 notproduct(intx, AssertRepeat, 1, \ 2812 "number of times to evaluate expression in assert " \ 2813 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2814 \ 2815 notproduct(ccstrlist, SuppressErrorAt, "", \ 2816 "List of assertions (file:line) to muzzle") \ 2817 \ 2818 notproduct(uintx, HandleAllocationLimit, 1024, \ 2819 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2820 "is used") \ 2821 \ 2822 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2823 "Threshold for total handle allocation when " \ 2824 "+TraceHandleAllocation is used") \ 2825 \ 2826 develop(intx, StackPrintLimit, 100, \ 2827 "number of stack frames to print in VM-level stack dump") \ 2828 \ 2829 notproduct(intx, MaxElementPrintSize, 256, \ 2830 "maximum number of elements to print") \ 2831 \ 2832 notproduct(intx, MaxSubklassPrintSize, 4, \ 2833 "maximum number of subklasses to print when printing klass") \ 2834 \ 2835 product(intx, MaxInlineLevel, 9, \ 2836 "maximum number of nested calls that are inlined") \ 2837 \ 2838 product(intx, MaxRecursiveInlineLevel, 1, \ 2839 "maximum number of nested recursive calls that are inlined") \ 2840 \ 2841 product_pd(intx, InlineSmallCode, \ 2842 "Only inline already compiled methods if their code size is " \ 2843 "less than this") \ 2844 \ 2845 product(intx, MaxInlineSize, 35, \ 2846 "maximum bytecode size of a method to be inlined") \ 2847 \ 2848 product_pd(intx, FreqInlineSize, \ 2849 "maximum bytecode size of a frequent method to be inlined") \ 2850 \ 2851 product(intx, MaxTrivialSize, 6, \ 2852 "maximum bytecode size of a trivial method to be inlined") \ 2853 \ 2854 product(intx, MinInliningThreshold, 250, \ 2855 "min. invocation count a method needs to have to be inlined") \ 2856 \ 2857 develop(intx, MethodHistogramCutoff, 100, \ 2858 "cutoff value for method invoc. histogram (+CountCalls)") \ 2859 \ 2860 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2861 "# of interpreted methods to show in profile") \ 2862 \ 2863 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2864 "# of compiled methods to show in profile") \ 2865 \ 2866 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2867 "# of stub methods to show in profile") \ 2868 \ 2869 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2870 "# of runtime stub nodes to show in profile") \ 2871 \ 2872 product(intx, ProfileIntervalsTicks, 100, \ 2873 "# of ticks between printing of interval profile " \ 2874 "(+ProfileIntervals)") \ 2875 \ 2876 notproduct(intx, ScavengeALotInterval, 1, \ 2877 "Interval between which scavenge will occur with +ScavengeALot") \ 2878 \ 2879 notproduct(intx, FullGCALotInterval, 1, \ 2880 "Interval between which full gc will occur with +FullGCALot") \ 2881 \ 2882 notproduct(intx, FullGCALotStart, 0, \ 2883 "For which invocation to start FullGCAlot") \ 2884 \ 2885 notproduct(intx, FullGCALotDummies, 32*K, \ 2886 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2887 "to move") \ 2888 \ 2889 develop(intx, DontYieldALotInterval, 10, \ 2890 "Interval between which yields will be dropped (milliseconds)") \ 2891 \ 2892 develop(intx, MinSleepInterval, 1, \ 2893 "Minimum sleep() interval (milliseconds) when " \ 2894 "ConvertSleepToYield is off (used for SOLARIS)") \ 2895 \ 2896 develop(intx, ProfilerPCTickThreshold, 15, \ 2897 "Number of ticks in a PC buckets to be a hotspot") \ 2898 \ 2899 notproduct(intx, DeoptimizeALotInterval, 5, \ 2900 "Number of exits until DeoptimizeALot kicks in") \ 2901 \ 2902 notproduct(intx, ZombieALotInterval, 5, \ 2903 "Number of exits until ZombieALot kicks in") \ 2904 \ 2905 develop(bool, StressNonEntrant, false, \ 2906 "Mark nmethods non-entrant at registration") \ 2907 \ 2908 diagnostic(intx, MallocVerifyInterval, 0, \ 2909 "if non-zero, verify C heap after every N calls to " \ 2910 "malloc/realloc/free") \ 2911 \ 2912 diagnostic(intx, MallocVerifyStart, 0, \ 2913 "if non-zero, start verifying C heap after Nth call to " \ 2914 "malloc/realloc/free") \ 2915 \ 2916 product(intx, TypeProfileWidth, 2, \ 2917 "number of receiver types to record in call/cast profile") \ 2918 \ 2919 develop(intx, BciProfileWidth, 2, \ 2920 "number of return bci's to record in ret profile") \ 2921 \ 2922 product(intx, PerMethodRecompilationCutoff, 400, \ 2923 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2924 \ 2925 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2926 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2927 \ 2928 product(intx, PerMethodTrapLimit, 100, \ 2929 "Limit on traps (of one kind) in a method (includes inlines)") \ 2930 \ 2931 product(intx, PerBytecodeTrapLimit, 4, \ 2932 "Limit on traps (of one kind) at a particular BCI") \ 2933 \ 2934 develop(intx, InlineFrequencyRatio, 20, \ 2935 "Ratio of call site execution to caller method invocation") \ 2936 \ 2937 develop_pd(intx, InlineFrequencyCount, \ 2938 "Count of call site execution necessary to trigger frequent " \ 2939 "inlining") \ 2940 \ 2941 develop(intx, InlineThrowCount, 50, \ 2942 "Force inlining of interpreted methods that throw this often") \ 2943 \ 2944 develop(intx, InlineThrowMaxSize, 200, \ 2945 "Force inlining of throwing methods smaller than this") \ 2946 \ 2947 develop(intx, ProfilerNodeSize, 1024, \ 2948 "Size in K to allocate for the Profile Nodes of each thread") \ 2949 \ 2950 product_pd(intx, PreInflateSpin, \ 2951 "Number of times to spin wait before inflation") \ 2952 \ 2953 /* gc parameters */ \ 2954 product(uintx, InitialHeapSize, 0, \ 2955 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2956 \ 2957 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2958 "Maximum heap size (in bytes)") \ 2959 \ 2960 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2961 "Initial tenured generation size (in bytes)") \ 2962 \ 2963 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2964 "Initial new generation size (in bytes)") \ 2965 \ 2966 product(uintx, MaxNewSize, max_uintx, \ 2967 "Maximum new generation size (in bytes), max_uintx means set " \ 2968 "ergonomically") \ 2969 \ 2970 product(uintx, PretenureSizeThreshold, 0, \ 2971 "Maximum size in bytes of objects allocated in DefNew " \ 2972 "generation; zero means no maximum") \ 2973 \ 2974 product(uintx, TLABSize, 0, \ 2975 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2976 \ 2977 product(uintx, MinTLABSize, 2*K, \ 2978 "Minimum allowed TLAB size (in bytes)") \ 2979 \ 2980 product(uintx, TLABAllocationWeight, 35, \ 2981 "Allocation averaging weight") \ 2982 \ 2983 product(uintx, TLABWasteTargetPercent, 1, \ 2984 "Percentage of Eden that can be wasted") \ 2985 \ 2986 product(uintx, TLABRefillWasteFraction, 64, \ 2987 "Max TLAB waste at a refill (internal fragmentation)") \ 2988 \ 2989 product(uintx, TLABWasteIncrement, 4, \ 2990 "Increment allowed waste at slow allocation") \ 2991 \ 2992 product(intx, SurvivorRatio, 8, \ 2993 "Ratio of eden/survivor space size") \ 2994 \ 2995 product(intx, NewRatio, 2, \ 2996 "Ratio of new/old generation sizes") \ 2997 \ 2998 product_pd(uintx, NewSizeThreadIncrease, \ 2999 "Additional size added to desired new generation size per " \ 3000 "non-daemon thread (in bytes)") \ 3001 \ 3002 product_pd(uintx, MetaspaceSize, \ 3003 "Initial size of Metaspaces (in bytes)") \ 3004 \ 3005 product(uintx, MaxMetaspaceSize, max_uintx, \ 3006 "Maximum size of Metaspaces (in bytes)") \ 3007 \ 3008 product(uintx, ClassMetaspaceSize, 2*M, \ 3009 "Maximum size of InstanceKlass area in Metaspace used for " \ 3010 "UseCompressedKlassPointers") \ 3011 \ 3012 product(uintx, MinHeapFreeRatio, 40, \ 3013 "Min percentage of heap free after GC to avoid expansion") \ 3014 \ 3015 product(uintx, MaxHeapFreeRatio, 70, \ 3016 "Max percentage of heap free after GC to avoid shrinking") \ 3017 \ 3018 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3019 "Number of milliseconds per MB of free space in the heap") \ 3020 \ 3021 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3022 "Min change in heap space due to GC (in bytes)") \ 3023 \ 3024 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3025 "Min expansion of permanent heap (in bytes)") \ 3026 \ 3027 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3028 "Max expansion of permanent heap without full GC (in bytes)") \ 3029 \ 3030 product(intx, QueuedAllocationWarningCount, 0, \ 3031 "Number of times an allocation that queues behind a GC " \ 3032 "will retry before printing a warning") \ 3033 \ 3034 diagnostic(uintx, VerifyGCStartAt, 0, \ 3035 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3036 \ 3037 diagnostic(intx, VerifyGCLevel, 0, \ 3038 "Generation level at which to start +VerifyBefore/AfterGC") \ 3039 \ 3040 product(uintx, MaxTenuringThreshold, 15, \ 3041 "Maximum value for tenuring threshold") \ 3042 \ 3043 product(uintx, InitialTenuringThreshold, 7, \ 3044 "Initial value for tenuring threshold") \ 3045 \ 3046 product(intx, TargetSurvivorRatio, 50, \ 3047 "Desired percentage of survivor space used after scavenge") \ 3048 \ 3049 product(uintx, MarkSweepDeadRatio, 5, \ 3050 "Percentage (0-100) of the old gen allowed as dead wood." \ 3051 "Serial mark sweep treats this as both the min and max value." \ 3052 "CMS uses this value only if it falls back to mark sweep." \ 3053 "Par compact uses a variable scale based on the density of the" \ 3054 "generation and treats this as the max value when the heap is" \ 3055 "either completely full or completely empty. Par compact also" \ 3056 "has a smaller default value; see arguments.cpp.") \ 3057 \ 3058 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3059 "How often should we fully compact the heap (ignoring the dead " \ 3060 "space parameters)") \ 3061 \ 3062 product(intx, PrintCMSStatistics, 0, \ 3063 "Statistics for CMS") \ 3064 \ 3065 product(bool, PrintCMSInitiationStatistics, false, \ 3066 "Statistics for initiating a CMS collection") \ 3067 \ 3068 product(intx, PrintFLSStatistics, 0, \ 3069 "Statistics for CMS' FreeListSpace") \ 3070 \ 3071 product(intx, PrintFLSCensus, 0, \ 3072 "Census for CMS' FreeListSpace") \ 3073 \ 3074 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3075 "Delay in ms between expansion and allocation") \ 3076 \ 3077 develop(uintx, GCWorkerDelayMillis, 0, \ 3078 "Delay in ms in scheduling GC workers") \ 3079 \ 3080 product(intx, DeferThrSuspendLoopCount, 4000, \ 3081 "(Unstable) Number of times to iterate in safepoint loop " \ 3082 " before blocking VM threads ") \ 3083 \ 3084 product(intx, DeferPollingPageLoopCount, -1, \ 3085 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3086 "before changing safepoint polling page to RO ") \ 3087 \ 3088 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3089 \ 3090 product(bool, PSChunkLargeArrays, true, \ 3091 "true: process large arrays in chunks") \ 3092 \ 3093 product(uintx, GCDrainStackTargetSize, 64, \ 3094 "how many entries we'll try to leave on the stack during " \ 3095 "parallel GC") \ 3096 \ 3097 /* stack parameters */ \ 3098 product_pd(intx, StackYellowPages, \ 3099 "Number of yellow zone (recoverable overflows) pages") \ 3100 \ 3101 product_pd(intx, StackRedPages, \ 3102 "Number of red zone (unrecoverable overflows) pages") \ 3103 \ 3104 product_pd(intx, StackShadowPages, \ 3105 "Number of shadow zone (for overflow checking) pages" \ 3106 " this should exceed the depth of the VM and native call stack") \ 3107 \ 3108 product_pd(intx, ThreadStackSize, \ 3109 "Thread Stack Size (in Kbytes)") \ 3110 \ 3111 product_pd(intx, VMThreadStackSize, \ 3112 "Non-Java Thread Stack Size (in Kbytes)") \ 3113 \ 3114 product_pd(intx, CompilerThreadStackSize, \ 3115 "Compiler Thread Stack Size (in Kbytes)") \ 3116 \ 3117 develop_pd(uintx, JVMInvokeMethodSlack, \ 3118 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3119 \ 3120 product(uintx, ThreadSafetyMargin, 50*M, \ 3121 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3122 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3123 "disable this feature") \ 3124 \ 3125 /* code cache parameters */ \ 3126 develop(uintx, CodeCacheSegmentSize, 64, \ 3127 "Code cache segment size (in bytes) - smallest unit of " \ 3128 "allocation") \ 3129 \ 3130 develop_pd(intx, CodeEntryAlignment, \ 3131 "Code entry alignment for generated code (in bytes)") \ 3132 \ 3133 product_pd(intx, OptoLoopAlignment, \ 3134 "Align inner loops to zero relative to this modulus") \ 3135 \ 3136 product_pd(uintx, InitialCodeCacheSize, \ 3137 "Initial code cache size (in bytes)") \ 3138 \ 3139 product_pd(uintx, ReservedCodeCacheSize, \ 3140 "Reserved code cache size (in bytes) - maximum code cache size") \ 3141 \ 3142 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3143 "When less than X space left, we stop compiling.") \ 3144 \ 3145 product_pd(uintx, CodeCacheExpansionSize, \ 3146 "Code cache expansion size (in bytes)") \ 3147 \ 3148 develop_pd(uintx, CodeCacheMinBlockLength, \ 3149 "Minimum number of segments in a code cache block.") \ 3150 \ 3151 notproduct(bool, ExitOnFullCodeCache, false, \ 3152 "Exit the VM if we fill the code cache.") \ 3153 \ 3154 product(bool, UseCodeCacheFlushing, true, \ 3155 "Attempt to clean the code cache before shutting off compiler") \ 3156 \ 3157 product(intx, MinCodeCacheFlushingInterval, 30, \ 3158 "Min number of seconds between code cache cleaning sessions") \ 3159 \ 3160 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3161 "When less than X space left, start code cache cleaning") \ 3162 \ 3163 /* interpreter debugging */ \ 3164 develop(intx, BinarySwitchThreshold, 5, \ 3165 "Minimal number of lookupswitch entries for rewriting to binary " \ 3166 "switch") \ 3167 \ 3168 develop(intx, StopInterpreterAt, 0, \ 3169 "Stops interpreter execution at specified bytecode number") \ 3170 \ 3171 develop(intx, TraceBytecodesAt, 0, \ 3172 "Traces bytecodes starting with specified bytecode number") \ 3173 \ 3174 /* compiler interface */ \ 3175 develop(intx, CIStart, 0, \ 3176 "the id of the first compilation to permit") \ 3177 \ 3178 develop(intx, CIStop, -1, \ 3179 "the id of the last compilation to permit") \ 3180 \ 3181 develop(intx, CIStartOSR, 0, \ 3182 "the id of the first osr compilation to permit " \ 3183 "(CICountOSR must be on)") \ 3184 \ 3185 develop(intx, CIStopOSR, -1, \ 3186 "the id of the last osr compilation to permit " \ 3187 "(CICountOSR must be on)") \ 3188 \ 3189 develop(intx, CIBreakAtOSR, -1, \ 3190 "id of osr compilation to break at") \ 3191 \ 3192 develop(intx, CIBreakAt, -1, \ 3193 "id of compilation to break at") \ 3194 \ 3195 product(ccstrlist, CompileOnly, "", \ 3196 "List of methods (pkg/class.name) to restrict compilation to") \ 3197 \ 3198 product(ccstr, CompileCommandFile, NULL, \ 3199 "Read compiler commands from this file [.hotspot_compiler]") \ 3200 \ 3201 product(ccstrlist, CompileCommand, "", \ 3202 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3203 \ 3204 develop(bool, ReplayCompiles, false, \ 3205 "Enable replay of compilations from ReplayDataFile") \ 3206 \ 3207 develop(ccstr, ReplayDataFile, "replay.txt", \ 3208 "file containing compilation replay information") \ 3209 \ 3210 develop(intx, ReplaySuppressInitializers, 2, \ 3211 "Controls handling of class initialization during replay" \ 3212 "0 - don't do anything special" \ 3213 "1 - treat all class initializers as empty" \ 3214 "2 - treat class initializers for application classes as empty" \ 3215 "3 - allow all class initializers to run during bootstrap but" \ 3216 " pretend they are empty after starting replay") \ 3217 \ 3218 develop(bool, ReplayIgnoreInitErrors, false, \ 3219 "Ignore exceptions thrown during initialization for replay") \ 3220 \ 3221 develop(bool, DumpReplayDataOnError, true, \ 3222 "record replay data for crashing compiler threads") \ 3223 \ 3224 product(bool, CICompilerCountPerCPU, false, \ 3225 "1 compiler thread for log(N CPUs)") \ 3226 \ 3227 develop(intx, CIFireOOMAt, -1, \ 3228 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3229 "(non-negative value throws OOM after this many CI accesses " \ 3230 "in each compile)") \ 3231 \ 3232 notproduct(bool, CIObjectFactoryVerify, false, \ 3233 "enable potentially expensive verification in ciObjectFactory") \ 3234 \ 3235 /* Priorities */ \ 3236 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3237 \ 3238 product(intx, ThreadPriorityPolicy, 0, \ 3239 "0 : Normal. "\ 3240 " VM chooses priorities that are appropriate for normal "\ 3241 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3242 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3243 " map to lower native priority values. On Windows applications"\ 3244 " are allowed to use higher native priorities. However, with "\ 3245 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3246 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3247 " interfere with system threads. On Linux thread priorities "\ 3248 " are ignored because the OS does not support static priority "\ 3249 " in SCHED_OTHER scheduling class which is the only choice for"\ 3250 " non-root, non-realtime applications. "\ 3251 "1 : Aggressive. "\ 3252 " Java thread priorities map over to the entire range of "\ 3253 " native thread priorities. Higher Java thread priorities map "\ 3254 " to higher native thread priorities. This policy should be "\ 3255 " used with care, as sometimes it can cause performance "\ 3256 " degradation in the application and/or the entire system. On "\ 3257 " Linux this policy requires root privilege.") \ 3258 \ 3259 product(bool, ThreadPriorityVerbose, false, \ 3260 "Print priority changes") \ 3261 \ 3262 product(intx, DefaultThreadPriority, -1, \ 3263 "The native priority at which threads run if not elsewhere " \ 3264 "specified (-1 means no change)") \ 3265 \ 3266 product(intx, CompilerThreadPriority, -1, \ 3267 "The native priority at which compiler threads should run " \ 3268 "(-1 means no change)") \ 3269 \ 3270 product(intx, VMThreadPriority, -1, \ 3271 "The native priority at which the VM thread should run " \ 3272 "(-1 means no change)") \ 3273 \ 3274 product(bool, CompilerThreadHintNoPreempt, true, \ 3275 "(Solaris only) Give compiler threads an extra quanta") \ 3276 \ 3277 product(bool, VMThreadHintNoPreempt, false, \ 3278 "(Solaris only) Give VM thread an extra quanta") \ 3279 \ 3280 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3281 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3282 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3283 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3284 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3285 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3286 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3287 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3288 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3289 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3290 \ 3291 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3292 "Java thread priority 10 maps to critical scheduling priority") \ 3293 \ 3294 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3295 "Compiler thread(s) run at critical scheduling priority") \ 3296 \ 3297 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3298 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3299 \ 3300 /* compiler debugging */ \ 3301 notproduct(intx, CompileTheWorldStartAt, 1, \ 3302 "First class to consider when using +CompileTheWorld") \ 3303 \ 3304 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3305 "Last class to consider when using +CompileTheWorld") \ 3306 \ 3307 develop(intx, NewCodeParameter, 0, \ 3308 "Testing Only: Create a dedicated integer parameter before " \ 3309 "putback") \ 3310 \ 3311 /* new oopmap storage allocation */ \ 3312 develop(intx, MinOopMapAllocation, 8, \ 3313 "Minimum number of OopMap entries in an OopMapSet") \ 3314 \ 3315 /* Background Compilation */ \ 3316 develop(intx, LongCompileThreshold, 50, \ 3317 "Used with +TraceLongCompiles") \ 3318 \ 3319 product(intx, StarvationMonitorInterval, 200, \ 3320 "Pause between each check in ms") \ 3321 \ 3322 /* recompilation */ \ 3323 product_pd(intx, CompileThreshold, \ 3324 "number of interpreted method invocations before (re-)compiling") \ 3325 \ 3326 product_pd(intx, BackEdgeThreshold, \ 3327 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3328 \ 3329 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3330 "Interpreter (tier 0) invocation notification frequency.") \ 3331 \ 3332 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3333 "C1 without MDO (tier 2) invocation notification frequency.") \ 3334 \ 3335 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3336 "C1 with MDO profiling (tier 3) invocation notification " \ 3337 "frequency.") \ 3338 \ 3339 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3340 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3341 \ 3342 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3343 "Interpreter (tier 0) invocation notification frequency.") \ 3344 \ 3345 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3346 "C1 without MDO (tier 2) invocation notification frequency.") \ 3347 \ 3348 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3349 "C1 with MDO profiling (tier 3) invocation notification " \ 3350 "frequency.") \ 3351 \ 3352 product(intx, Tier2CompileThreshold, 0, \ 3353 "threshold at which tier 2 compilation is invoked") \ 3354 \ 3355 product(intx, Tier2BackEdgeThreshold, 0, \ 3356 "Back edge threshold at which tier 2 compilation is invoked") \ 3357 \ 3358 product(intx, Tier3InvocationThreshold, 200, \ 3359 "Compile if number of method invocations crosses this " \ 3360 "threshold") \ 3361 \ 3362 product(intx, Tier3MinInvocationThreshold, 100, \ 3363 "Minimum invocation to compile at tier 3") \ 3364 \ 3365 product(intx, Tier3CompileThreshold, 2000, \ 3366 "Threshold at which tier 3 compilation is invoked (invocation " \ 3367 "minimum must be satisfied.") \ 3368 \ 3369 product(intx, Tier3BackEdgeThreshold, 60000, \ 3370 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3371 \ 3372 product(intx, Tier4InvocationThreshold, 5000, \ 3373 "Compile if number of method invocations crosses this " \ 3374 "threshold") \ 3375 \ 3376 product(intx, Tier4MinInvocationThreshold, 600, \ 3377 "Minimum invocation to compile at tier 4") \ 3378 \ 3379 product(intx, Tier4CompileThreshold, 15000, \ 3380 "Threshold at which tier 4 compilation is invoked (invocation " \ 3381 "minimum must be satisfied.") \ 3382 \ 3383 product(intx, Tier4BackEdgeThreshold, 40000, \ 3384 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3385 \ 3386 product(intx, Tier3DelayOn, 5, \ 3387 "If C2 queue size grows over this amount per compiler thread " \ 3388 "stop compiling at tier 3 and start compiling at tier 2") \ 3389 \ 3390 product(intx, Tier3DelayOff, 2, \ 3391 "If C2 queue size is less than this amount per compiler thread " \ 3392 "allow methods compiled at tier 2 transition to tier 3") \ 3393 \ 3394 product(intx, Tier3LoadFeedback, 5, \ 3395 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3396 "reaches this amount per compiler thread") \ 3397 \ 3398 product(intx, Tier4LoadFeedback, 3, \ 3399 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3400 "reaches this amount per compiler thread") \ 3401 \ 3402 product(intx, TieredCompileTaskTimeout, 50, \ 3403 "Kill compile task if method was not used within " \ 3404 "given timeout in milliseconds") \ 3405 \ 3406 product(intx, TieredStopAtLevel, 4, \ 3407 "Stop at given compilation level") \ 3408 \ 3409 product(intx, Tier0ProfilingStartPercentage, 200, \ 3410 "Start profiling in interpreter if the counters exceed tier 3" \ 3411 "thresholds by the specified percentage") \ 3412 \ 3413 product(intx, TieredRateUpdateMinTime, 1, \ 3414 "Minimum rate sampling interval (in milliseconds)") \ 3415 \ 3416 product(intx, TieredRateUpdateMaxTime, 25, \ 3417 "Maximum rate sampling interval (in milliseconds)") \ 3418 \ 3419 product_pd(bool, TieredCompilation, \ 3420 "Enable tiered compilation") \ 3421 \ 3422 product(bool, PrintTieredEvents, false, \ 3423 "Print tiered events notifications") \ 3424 \ 3425 product_pd(intx, OnStackReplacePercentage, \ 3426 "NON_TIERED number of method invocations/branches (expressed as %"\ 3427 "of CompileThreshold) before (re-)compiling OSR code") \ 3428 \ 3429 product(intx, InterpreterProfilePercentage, 33, \ 3430 "NON_TIERED number of method invocations/branches (expressed as %"\ 3431 "of CompileThreshold) before profiling in the interpreter") \ 3432 \ 3433 develop(intx, MaxRecompilationSearchLength, 10, \ 3434 "max. # frames to inspect searching for recompilee") \ 3435 \ 3436 develop(intx, MaxInterpretedSearchLength, 3, \ 3437 "max. # interp. frames to skip when searching for recompilee") \ 3438 \ 3439 develop(intx, DesiredMethodLimit, 8000, \ 3440 "desired max. method size (in bytecodes) after inlining") \ 3441 \ 3442 develop(intx, HugeMethodLimit, 8000, \ 3443 "don't compile methods larger than this if " \ 3444 "+DontCompileHugeMethods") \ 3445 \ 3446 /* New JDK 1.4 reflection implementation */ \ 3447 \ 3448 develop(bool, UseNewReflection, true, \ 3449 "Temporary flag for transition to reflection based on dynamic " \ 3450 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3451 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3452 "changes were needed") \ 3453 \ 3454 develop(bool, VerifyReflectionBytecodes, false, \ 3455 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3456 "in situations like that described in 4486457 or for " \ 3457 "constructors generated for serialization, so can not be enabled "\ 3458 "in product.") \ 3459 \ 3460 product(bool, ReflectionWrapResolutionErrors, true, \ 3461 "Temporary flag for transition to AbstractMethodError wrapped " \ 3462 "in InvocationTargetException. See 6531596") \ 3463 \ 3464 \ 3465 develop(intx, FastSuperclassLimit, 8, \ 3466 "Depth of hardwired instanceof accelerator array") \ 3467 \ 3468 /* Properties for Java libraries */ \ 3469 \ 3470 product(uintx, MaxDirectMemorySize, 0, \ 3471 "Maximum total size of NIO direct-buffer allocations") \ 3472 \ 3473 /* temporary developer defined flags */ \ 3474 \ 3475 diagnostic(bool, UseNewCode, false, \ 3476 "Testing Only: Use the new version while testing") \ 3477 \ 3478 diagnostic(bool, UseNewCode2, false, \ 3479 "Testing Only: Use the new version while testing") \ 3480 \ 3481 diagnostic(bool, UseNewCode3, false, \ 3482 "Testing Only: Use the new version while testing") \ 3483 \ 3484 /* flags for performance data collection */ \ 3485 \ 3486 product(bool, UsePerfData, falseInEmbedded, \ 3487 "Flag to disable jvmstat instrumentation for performance testing" \ 3488 "and problem isolation purposes.") \ 3489 \ 3490 product(bool, PerfDataSaveToFile, false, \ 3491 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3492 \ 3493 product(ccstr, PerfDataSaveFile, NULL, \ 3494 "Save PerfData memory to the specified absolute pathname," \ 3495 "%p in the file name if present will be replaced by pid") \ 3496 \ 3497 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3498 "Data sampling interval in milliseconds") \ 3499 \ 3500 develop(bool, PerfTraceDataCreation, false, \ 3501 "Trace creation of Performance Data Entries") \ 3502 \ 3503 develop(bool, PerfTraceMemOps, false, \ 3504 "Trace PerfMemory create/attach/detach calls") \ 3505 \ 3506 product(bool, PerfDisableSharedMem, false, \ 3507 "Store performance data in standard memory") \ 3508 \ 3509 product(intx, PerfDataMemorySize, 32*K, \ 3510 "Size of performance data memory region. Will be rounded " \ 3511 "up to a multiple of the native os page size.") \ 3512 \ 3513 product(intx, PerfMaxStringConstLength, 1024, \ 3514 "Maximum PerfStringConstant string length before truncation") \ 3515 \ 3516 product(bool, PerfAllowAtExitRegistration, false, \ 3517 "Allow registration of atexit() methods") \ 3518 \ 3519 product(bool, PerfBypassFileSystemCheck, false, \ 3520 "Bypass Win32 file system criteria checks (Windows Only)") \ 3521 \ 3522 product(intx, UnguardOnExecutionViolation, 0, \ 3523 "Unguard page and retry on no-execute fault (Win32 only)" \ 3524 "0=off, 1=conservative, 2=aggressive") \ 3525 \ 3526 /* Serviceability Support */ \ 3527 \ 3528 product(bool, ManagementServer, false, \ 3529 "Create JMX Management Server") \ 3530 \ 3531 product(bool, DisableAttachMechanism, false, \ 3532 "Disable mechanism that allows tools to attach to this VM") \ 3533 \ 3534 product(bool, StartAttachListener, false, \ 3535 "Always start Attach Listener at VM startup") \ 3536 \ 3537 manageable(bool, PrintConcurrentLocks, false, \ 3538 "Print java.util.concurrent locks in thread dump") \ 3539 \ 3540 product(bool, TransmitErrorReport, false, \ 3541 "Enable error report transmission on erroneous termination") \ 3542 \ 3543 product(ccstr, ErrorReportServer, NULL, \ 3544 "Override built-in error report server address") \ 3545 \ 3546 /* Shared spaces */ \ 3547 \ 3548 product(bool, UseSharedSpaces, true, \ 3549 "Use shared spaces for metadata") \ 3550 \ 3551 product(bool, RequireSharedSpaces, false, \ 3552 "Require shared spaces for metadata") \ 3553 \ 3554 product(bool, DumpSharedSpaces, false, \ 3555 "Special mode: JVM reads a class list, loads classes, builds " \ 3556 "shared spaces, and dumps the shared spaces to a file to be " \ 3557 "used in future JVM runs.") \ 3558 \ 3559 product(bool, PrintSharedSpaces, false, \ 3560 "Print usage of shared spaces") \ 3561 \ 3562 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3563 "Size of read-write space for metadata (in bytes)") \ 3564 \ 3565 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3566 "Size of read-only space for metadata (in bytes)") \ 3567 \ 3568 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3569 "Size of the shared miscellaneous data area (in bytes)") \ 3570 \ 3571 product(uintx, SharedMiscCodeSize, 120*K, \ 3572 "Size of the shared miscellaneous code area (in bytes)") \ 3573 \ 3574 product(uintx, SharedDummyBlockSize, 0, \ 3575 "Size of dummy block used to shift heap addresses (in bytes)") \ 3576 \ 3577 diagnostic(bool, EnableInvokeDynamic, true, \ 3578 "support JSR 292 (method handles, invokedynamic, " \ 3579 "anonymous classes") \ 3580 \ 3581 diagnostic(bool, PrintMethodHandleStubs, false, \ 3582 "Print generated stub code for method handles") \ 3583 \ 3584 develop(bool, TraceMethodHandles, false, \ 3585 "trace internal method handle operations") \ 3586 \ 3587 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3588 "perform extra checks when constructing method handles") \ 3589 \ 3590 diagnostic(bool, ShowHiddenFrames, false, \ 3591 "show method handle implementation frames (usually hidden)") \ 3592 \ 3593 experimental(bool, TrustFinalNonStaticFields, false, \ 3594 "trust final non-static declarations for constant folding") \ 3595 \ 3596 develop(bool, TraceInvokeDynamic, false, \ 3597 "trace internal invoke dynamic operations") \ 3598 \ 3599 diagnostic(bool, PauseAtStartup, false, \ 3600 "Causes the VM to pause at startup time and wait for the pause " \ 3601 "file to be removed (default: ./vm.paused.<pid>)") \ 3602 \ 3603 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3604 "The file to create and for whose removal to await when pausing " \ 3605 "at startup. (default: ./vm.paused.<pid>)") \ 3606 \ 3607 diagnostic(bool, PauseAtExit, false, \ 3608 "Pause and wait for keypress on exit if a debugger is attached") \ 3609 \ 3610 product(bool, ExtendedDTraceProbes, false, \ 3611 "Enable performance-impacting dtrace probes") \ 3612 \ 3613 product(bool, DTraceMethodProbes, false, \ 3614 "Enable dtrace probes for method-entry and method-exit") \ 3615 \ 3616 product(bool, DTraceAllocProbes, false, \ 3617 "Enable dtrace probes for object allocation") \ 3618 \ 3619 product(bool, DTraceMonitorProbes, false, \ 3620 "Enable dtrace probes for monitor events") \ 3621 \ 3622 product(bool, RelaxAccessControlCheck, false, \ 3623 "Relax the access control checks in the verifier") \ 3624 \ 3625 diagnostic(bool, PrintDTraceDOF, false, \ 3626 "Print the DTrace DOF passed to the system for JSDT probes") \ 3627 \ 3628 product(uintx, StringTableSize, defaultStringTableSize, \ 3629 "Number of buckets in the interned String table") \ 3630 \ 3631 develop(bool, TraceDefaultMethods, false, \ 3632 "Trace the default method processing steps") \ 3633 \ 3634 develop(bool, ParseAllGenericSignatures, false, \ 3635 "Parse all generic signatures while classloading") \ 3636 \ 3637 develop(bool, VerifyGenericSignatures, false, \ 3638 "Abort VM on erroneous or inconsistent generic signatures") \ 3639 \ 3640 product(bool, UseVMInterruptibleIO, false, \ 3641 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3642 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3643 " of this flag is true for JDK 6 and earlier") \ 3644 \ 3645 diagnostic(bool, WhiteBoxAPI, false, \ 3646 "Enable internal testing APIs") \ 3647 \ 3648 product(bool, PrintGCCause, true, \ 3649 "Include GC cause in GC logging") 3650 3651/* 3652 * Macros for factoring of globals 3653 */ 3654 3655// Interface macros 3656#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3657#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3658#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3659#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3660#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3661#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3662#ifdef PRODUCT 3663#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3664#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3665#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3666#else 3667#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3668#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3669#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3670#endif 3671// Special LP64 flags, product only needed for now. 3672#ifdef _LP64 3673#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3674#else 3675#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3676#endif // _LP64 3677 3678// Implementation macros 3679#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3680#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3681#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3682#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3683#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3684#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3685#ifdef PRODUCT 3686#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3687#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3688#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3689#else 3690#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3691#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3692#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3693#endif 3694#ifdef _LP64 3695#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3696#else 3697#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3698#endif // _LP64 3699 3700RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG) 3701 3702RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3703 3704ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3705 3706// Extensions 3707 3708#include "runtime/globals_ext.hpp" 3709 3710#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3711