globals.hpp revision 3723:65d07d9ee446
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(uintx, LargePageSizeInBytes, 0, \ 537 "Large page size (0 to let VM choose the page size") \ 538 \ 539 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 540 "Use large pages if max heap is at least this big") \ 541 \ 542 product(bool, ForceTimeHighResolution, false, \ 543 "Using high time resolution(For Win32 only)") \ 544 \ 545 develop(bool, TraceItables, false, \ 546 "Trace initialization and use of itables") \ 547 \ 548 develop(bool, TracePcPatching, false, \ 549 "Trace usage of frame::patch_pc") \ 550 \ 551 develop(bool, TraceJumps, false, \ 552 "Trace assembly jumps in thread ring buffer") \ 553 \ 554 develop(bool, TraceRelocator, false, \ 555 "Trace the bytecode relocator") \ 556 \ 557 develop(bool, TraceLongCompiles, false, \ 558 "Print out every time compilation is longer than " \ 559 "a given threashold") \ 560 \ 561 develop(bool, SafepointALot, false, \ 562 "Generates a lot of safepoints. Works with " \ 563 "GuaranteedSafepointInterval") \ 564 \ 565 product_pd(bool, BackgroundCompilation, \ 566 "A thread requesting compilation is not blocked during " \ 567 "compilation") \ 568 \ 569 product(bool, PrintVMQWaitTime, false, \ 570 "Prints out the waiting time in VM operation queue") \ 571 \ 572 develop(bool, NoYieldsInMicrolock, false, \ 573 "Disable yields in microlock") \ 574 \ 575 develop(bool, TraceOopMapGeneration, false, \ 576 "Shows oopmap generation") \ 577 \ 578 product(bool, MethodFlushing, true, \ 579 "Reclamation of zombie and not-entrant methods") \ 580 \ 581 develop(bool, VerifyStack, false, \ 582 "Verify stack of each thread when it is entering a runtime call") \ 583 \ 584 diagnostic(bool, ForceUnreachable, false, \ 585 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 586 \ 587 notproduct(bool, StressDerivedPointers, false, \ 588 "Force scavenge when a derived pointers is detected on stack " \ 589 "after rtm call") \ 590 \ 591 develop(bool, TraceDerivedPointers, false, \ 592 "Trace traversal of derived pointers on stack") \ 593 \ 594 notproduct(bool, TraceCodeBlobStacks, false, \ 595 "Trace stack-walk of codeblobs") \ 596 \ 597 product(bool, PrintJNIResolving, false, \ 598 "Used to implement -v:jni") \ 599 \ 600 notproduct(bool, PrintRewrites, false, \ 601 "Print methods that are being rewritten") \ 602 \ 603 product(bool, UseInlineCaches, true, \ 604 "Use Inline Caches for virtual calls ") \ 605 \ 606 develop(bool, InlineArrayCopy, true, \ 607 "inline arraycopy native that is known to be part of " \ 608 "base library DLL") \ 609 \ 610 develop(bool, InlineObjectHash, true, \ 611 "inline Object::hashCode() native that is known to be part " \ 612 "of base library DLL") \ 613 \ 614 develop(bool, InlineNatives, true, \ 615 "inline natives that are known to be part of base library DLL") \ 616 \ 617 develop(bool, InlineMathNatives, true, \ 618 "inline SinD, CosD, etc.") \ 619 \ 620 develop(bool, InlineClassNatives, true, \ 621 "inline Class.isInstance, etc") \ 622 \ 623 develop(bool, InlineThreadNatives, true, \ 624 "inline Thread.currentThread, etc") \ 625 \ 626 develop(bool, InlineUnsafeOps, true, \ 627 "inline memory ops (native methods) from sun.misc.Unsafe") \ 628 \ 629 product(bool, CriticalJNINatives, true, \ 630 "check for critical JNI entry points") \ 631 \ 632 notproduct(bool, StressCriticalJNINatives, false, \ 633 "Exercise register saving code in critical natives") \ 634 \ 635 product(bool, UseSSE42Intrinsics, false, \ 636 "SSE4.2 versions of intrinsics") \ 637 \ 638 develop(bool, TraceCallFixup, false, \ 639 "traces all call fixups") \ 640 \ 641 develop(bool, DeoptimizeALot, false, \ 642 "deoptimize at every exit from the runtime system") \ 643 \ 644 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 645 "a comma separated list of bcis to deoptimize at") \ 646 \ 647 product(bool, DeoptimizeRandom, false, \ 648 "deoptimize random frames on random exit from the runtime system")\ 649 \ 650 notproduct(bool, ZombieALot, false, \ 651 "creates zombies (non-entrant) at exit from the runt. system") \ 652 \ 653 product(bool, UnlinkSymbolsALot, false, \ 654 "unlink unreferenced symbols from the symbol table at safepoints")\ 655 \ 656 notproduct(bool, WalkStackALot, false, \ 657 "trace stack (no print) at every exit from the runtime system") \ 658 \ 659 product(bool, Debugging, false, \ 660 "set when executing debug methods in debug.ccp " \ 661 "(to prevent triggering assertions)") \ 662 \ 663 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 664 "Enable strict checks that safepoints cannot happen for threads " \ 665 "that used No_Safepoint_Verifier") \ 666 \ 667 notproduct(bool, VerifyLastFrame, false, \ 668 "Verify oops on last frame on entry to VM") \ 669 \ 670 develop(bool, TraceHandleAllocation, false, \ 671 "Prints out warnings when suspicious many handles are allocated") \ 672 \ 673 product(bool, UseCompilerSafepoints, true, \ 674 "Stop at safepoints in compiled code") \ 675 \ 676 product(bool, UseSplitVerifier, true, \ 677 "use split verifier with StackMapTable attributes") \ 678 \ 679 product(bool, FailOverToOldVerifier, true, \ 680 "fail over to old verifier when split verifier fails") \ 681 \ 682 develop(bool, ShowSafepointMsgs, false, \ 683 "Show msg. about safepoint synch.") \ 684 \ 685 product(bool, SafepointTimeout, false, \ 686 "Time out and warn or fail after SafepointTimeoutDelay " \ 687 "milliseconds if failed to reach safepoint") \ 688 \ 689 develop(bool, DieOnSafepointTimeout, false, \ 690 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 691 \ 692 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 693 /* typically, at most a few retries are needed */ \ 694 product(intx, SuspendRetryCount, 50, \ 695 "Maximum retry count for an external suspend request") \ 696 \ 697 product(intx, SuspendRetryDelay, 5, \ 698 "Milliseconds to delay per retry (* current_retry_count)") \ 699 \ 700 product(bool, AssertOnSuspendWaitFailure, false, \ 701 "Assert/Guarantee on external suspend wait failure") \ 702 \ 703 product(bool, TraceSuspendWaitFailures, false, \ 704 "Trace external suspend wait failures") \ 705 \ 706 product(bool, MaxFDLimit, true, \ 707 "Bump the number of file descriptors to max in solaris.") \ 708 \ 709 diagnostic(bool, LogEvents, true, \ 710 "Enable the various ring buffer event logs") \ 711 \ 712 diagnostic(intx, LogEventsBufferEntries, 10, \ 713 "Enable the various ring buffer event logs") \ 714 \ 715 product(bool, BytecodeVerificationRemote, true, \ 716 "Enables the Java bytecode verifier for remote classes") \ 717 \ 718 product(bool, BytecodeVerificationLocal, false, \ 719 "Enables the Java bytecode verifier for local classes") \ 720 \ 721 develop(bool, ForceFloatExceptions, trueInDebug, \ 722 "Force exceptions on FP stack under/overflow") \ 723 \ 724 develop(bool, VerifyStackAtCalls, false, \ 725 "Verify that the stack pointer is unchanged after calls") \ 726 \ 727 develop(bool, TraceJavaAssertions, false, \ 728 "Trace java language assertions") \ 729 \ 730 notproduct(bool, CheckAssertionStatusDirectives, false, \ 731 "temporary - see javaClasses.cpp") \ 732 \ 733 notproduct(bool, PrintMallocFree, false, \ 734 "Trace calls to C heap malloc/free allocation") \ 735 \ 736 product(bool, PrintOopAddress, false, \ 737 "Always print the location of the oop") \ 738 \ 739 notproduct(bool, VerifyCodeCacheOften, false, \ 740 "Verify compiled-code cache often") \ 741 \ 742 develop(bool, ZapDeadCompiledLocals, false, \ 743 "Zap dead locals in compiler frames") \ 744 \ 745 notproduct(bool, ZapDeadLocalsOld, false, \ 746 "Zap dead locals (old version, zaps all frames when " \ 747 "entering the VM") \ 748 \ 749 notproduct(bool, CheckOopishValues, false, \ 750 "Warn if value contains oop ( requires ZapDeadLocals)") \ 751 \ 752 develop(bool, UseMallocOnly, false, \ 753 "use only malloc/free for allocation (no resource area/arena)") \ 754 \ 755 develop(bool, PrintMalloc, false, \ 756 "print all malloc/free calls") \ 757 \ 758 develop(bool, PrintMallocStatistics, false, \ 759 "print malloc/free statistics") \ 760 \ 761 develop(bool, ZapResourceArea, trueInDebug, \ 762 "Zap freed resource/arena space with 0xABABABAB") \ 763 \ 764 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 765 "Zap freed VM handle space with 0xBCBCBCBC") \ 766 \ 767 develop(bool, ZapJNIHandleArea, trueInDebug, \ 768 "Zap freed JNI handle space with 0xFEFEFEFE") \ 769 \ 770 notproduct(bool, ZapStackSegments, trueInDebug, \ 771 "Zap allocated/freed Stack segments with 0xFADFADED") \ 772 \ 773 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 774 "Zap unused heap space with 0xBAADBABE") \ 775 \ 776 develop(bool, TraceZapUnusedHeapArea, false, \ 777 "Trace zapping of unused heap space") \ 778 \ 779 develop(bool, CheckZapUnusedHeapArea, false, \ 780 "Check zapping of unused heap space") \ 781 \ 782 develop(bool, ZapFillerObjects, trueInDebug, \ 783 "Zap filler objects with 0xDEAFBABE") \ 784 \ 785 develop(bool, PrintVMMessages, true, \ 786 "Print vm messages on console") \ 787 \ 788 product(bool, PrintGCApplicationConcurrentTime, false, \ 789 "Print the time the application has been running") \ 790 \ 791 product(bool, PrintGCApplicationStoppedTime, false, \ 792 "Print the time the application has been stopped") \ 793 \ 794 diagnostic(bool, VerboseVerification, false, \ 795 "Display detailed verification details") \ 796 \ 797 notproduct(uintx, ErrorHandlerTest, 0, \ 798 "If > 0, provokes an error after VM initialization; the value" \ 799 "determines which error to provoke. See test_error_handler()" \ 800 "in debug.cpp.") \ 801 \ 802 develop(bool, Verbose, false, \ 803 "Prints additional debugging information from other modes") \ 804 \ 805 develop(bool, PrintMiscellaneous, false, \ 806 "Prints uncategorized debugging information (requires +Verbose)") \ 807 \ 808 develop(bool, WizardMode, false, \ 809 "Prints much more debugging information") \ 810 \ 811 product(bool, ShowMessageBoxOnError, false, \ 812 "Keep process alive on VM fatal error") \ 813 \ 814 product(bool, CreateMinidumpOnCrash, false, \ 815 "Create minidump on VM fatal error") \ 816 \ 817 product_pd(bool, UseOSErrorReporting, \ 818 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 819 \ 820 product(bool, SuppressFatalErrorMessage, false, \ 821 "Do NO Fatal Error report [Avoid deadlock]") \ 822 \ 823 product(ccstrlist, OnError, "", \ 824 "Run user-defined commands on fatal error; see VMError.cpp " \ 825 "for examples") \ 826 \ 827 product(ccstrlist, OnOutOfMemoryError, "", \ 828 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 829 \ 830 manageable(bool, HeapDumpBeforeFullGC, false, \ 831 "Dump heap to file before any major stop-world GC") \ 832 \ 833 manageable(bool, HeapDumpAfterFullGC, false, \ 834 "Dump heap to file after any major stop-world GC") \ 835 \ 836 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 837 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 838 \ 839 manageable(ccstr, HeapDumpPath, NULL, \ 840 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 841 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 842 "in the working directory)") \ 843 \ 844 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 845 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 846 "when the heap usage is larger than this") \ 847 \ 848 develop(uintx, HeapDumpSegmentSize, 1*G, \ 849 "Approximate segment size when generating a segmented heap dump") \ 850 \ 851 develop(bool, BreakAtWarning, false, \ 852 "Execute breakpoint upon encountering VM warning") \ 853 \ 854 product_pd(bool, UseVectoredExceptions, \ 855 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 856 \ 857 develop(bool, TraceVMOperation, false, \ 858 "Trace vm operations") \ 859 \ 860 develop(bool, UseFakeTimers, false, \ 861 "Tells whether the VM should use system time or a fake timer") \ 862 \ 863 product(ccstr, NativeMemoryTracking, "off", \ 864 "Native memory tracking options") \ 865 \ 866 diagnostic(bool, PrintNMTStatistics, false, \ 867 "Print native memory tracking summary data if it is on") \ 868 \ 869 diagnostic(bool, LogCompilation, false, \ 870 "Log compilation activity in detail to hotspot.log or LogFile") \ 871 \ 872 product(bool, PrintCompilation, false, \ 873 "Print compilations") \ 874 \ 875 diagnostic(bool, TraceNMethodInstalls, false, \ 876 "Trace nmethod intallation") \ 877 \ 878 diagnostic(intx, ScavengeRootsInCode, 2, \ 879 "0: do not allow scavengable oops in the code cache; " \ 880 "1: allow scavenging from the code cache; " \ 881 "2: emit as many constants as the compiler can see") \ 882 \ 883 product(bool, AlwaysRestoreFPU, false, \ 884 "Restore the FPU control word after every JNI call (expensive)") \ 885 \ 886 diagnostic(bool, PrintCompilation2, false, \ 887 "Print additional statistics per compilation") \ 888 \ 889 diagnostic(bool, PrintAdapterHandlers, false, \ 890 "Print code generated for i2c/c2i adapters") \ 891 \ 892 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 893 "Verify that i2c/c2i adapters are called properly") \ 894 \ 895 develop(bool, VerifyAdapterSharing, false, \ 896 "Verify that the code for shared adapters is the equivalent") \ 897 \ 898 diagnostic(bool, PrintAssembly, false, \ 899 "Print assembly code (using external disassembler.so)") \ 900 \ 901 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 902 "Options string passed to disassembler.so") \ 903 \ 904 diagnostic(bool, PrintNMethods, false, \ 905 "Print assembly code for nmethods when generated") \ 906 \ 907 diagnostic(bool, PrintNativeNMethods, false, \ 908 "Print assembly code for native nmethods when generated") \ 909 \ 910 develop(bool, PrintDebugInfo, false, \ 911 "Print debug information for all nmethods when generated") \ 912 \ 913 develop(bool, PrintRelocations, false, \ 914 "Print relocation information for all nmethods when generated") \ 915 \ 916 develop(bool, PrintDependencies, false, \ 917 "Print dependency information for all nmethods when generated") \ 918 \ 919 develop(bool, PrintExceptionHandlers, false, \ 920 "Print exception handler tables for all nmethods when generated") \ 921 \ 922 develop(bool, InterceptOSException, false, \ 923 "Starts debugger when an implicit OS (e.g., NULL) " \ 924 "exception happens") \ 925 \ 926 notproduct(bool, PrintCodeCache, false, \ 927 "Print the compiled_code cache when exiting") \ 928 \ 929 develop(bool, PrintCodeCache2, false, \ 930 "Print detailed info on the compiled_code cache when exiting") \ 931 \ 932 diagnostic(bool, PrintStubCode, false, \ 933 "Print generated stub code") \ 934 \ 935 product(bool, StackTraceInThrowable, true, \ 936 "Collect backtrace in throwable when exception happens") \ 937 \ 938 product(bool, OmitStackTraceInFastThrow, true, \ 939 "Omit backtraces for some 'hot' exceptions in optimized code") \ 940 \ 941 product(bool, ProfilerPrintByteCodeStatistics, false, \ 942 "Prints byte code statictics when dumping profiler output") \ 943 \ 944 product(bool, ProfilerRecordPC, false, \ 945 "Collects tick for each 16 byte interval of compiled code") \ 946 \ 947 product(bool, ProfileVM, false, \ 948 "Profiles ticks that fall within VM (either in the VM Thread " \ 949 "or VM code called through stubs)") \ 950 \ 951 product(bool, ProfileIntervals, false, \ 952 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 953 \ 954 notproduct(bool, ProfilerCheckIntervals, false, \ 955 "Collect and print info on spacing of profiler ticks") \ 956 \ 957 develop(bool, PrintJVMWarnings, false, \ 958 "Prints warnings for unimplemented JVM functions") \ 959 \ 960 product(bool, PrintWarnings, true, \ 961 "Prints JVM warnings to output stream") \ 962 \ 963 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 964 "Prints warnings for stalled SpinLocks") \ 965 \ 966 develop(bool, InitializeJavaLangSystem, true, \ 967 "Initialize java.lang.System - turn off for individual " \ 968 "method debugging") \ 969 \ 970 develop(bool, InitializeJavaLangString, true, \ 971 "Initialize java.lang.String - turn off for individual " \ 972 "method debugging") \ 973 \ 974 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 975 "Initialize various error and exception classes - turn off for " \ 976 "individual method debugging") \ 977 \ 978 product(bool, RegisterFinalizersAtInit, true, \ 979 "Register finalizable objects at end of Object.<init> or " \ 980 "after allocation") \ 981 \ 982 develop(bool, RegisterReferences, true, \ 983 "Tells whether the VM should register soft/weak/final/phantom " \ 984 "references") \ 985 \ 986 develop(bool, IgnoreRewrites, false, \ 987 "Supress rewrites of bytecodes in the oopmap generator. " \ 988 "This is unsafe!") \ 989 \ 990 develop(bool, PrintCodeCacheExtension, false, \ 991 "Print extension of code cache") \ 992 \ 993 develop(bool, UsePrivilegedStack, true, \ 994 "Enable the security JVM functions") \ 995 \ 996 develop(bool, ProtectionDomainVerification, true, \ 997 "Verifies protection domain before resolution in system " \ 998 "dictionary") \ 999 \ 1000 product(bool, ClassUnloading, true, \ 1001 "Do unloading of classes") \ 1002 \ 1003 diagnostic(bool, LinkWellKnownClasses, true, \ 1004 "Resolve a well known class as soon as its name is seen") \ 1005 \ 1006 develop(bool, DisableStartThread, false, \ 1007 "Disable starting of additional Java threads " \ 1008 "(for debugging only)") \ 1009 \ 1010 develop(bool, MemProfiling, false, \ 1011 "Write memory usage profiling to log file") \ 1012 \ 1013 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1014 "Prints the system dictionary at exit") \ 1015 \ 1016 experimental(intx, PredictedLoadedClassCount, 0, \ 1017 "Experimental: Tune loaded class cache starting size.") \ 1018 \ 1019 diagnostic(bool, UnsyncloadClass, false, \ 1020 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1021 "class loader must call VM synchronized for findClass " \ 1022 "and defineClass.") \ 1023 \ 1024 product(bool, AlwaysLockClassLoader, false, \ 1025 "Require the VM to acquire the class loader lock before calling " \ 1026 "loadClass() even for class loaders registering " \ 1027 "as parallel capable") \ 1028 \ 1029 product(bool, AllowParallelDefineClass, false, \ 1030 "Allow parallel defineClass requests for class loaders " \ 1031 "registering as parallel capable") \ 1032 \ 1033 product(bool, MustCallLoadClassInternal, false, \ 1034 "Call loadClassInternal() rather than loadClass()") \ 1035 \ 1036 product_pd(bool, DontYieldALot, \ 1037 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1038 \ 1039 product_pd(bool, ConvertSleepToYield, \ 1040 "Converts sleep(0) to thread yield " \ 1041 "(may be off for SOLARIS to improve GUI)") \ 1042 \ 1043 product(bool, ConvertYieldToSleep, false, \ 1044 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1045 "behavior (SOLARIS only)") \ 1046 \ 1047 product(bool, UseBoundThreads, true, \ 1048 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1049 \ 1050 develop(bool, UseDetachedThreads, true, \ 1051 "Use detached threads that are recycled upon termination " \ 1052 "(for SOLARIS only)") \ 1053 \ 1054 product(bool, UseLWPSynchronization, true, \ 1055 "Use LWP-based instead of libthread-based synchronization " \ 1056 "(SPARC only)") \ 1057 \ 1058 product(ccstr, SyncKnobs, NULL, \ 1059 "(Unstable) Various monitor synchronization tunables") \ 1060 \ 1061 product(intx, EmitSync, 0, \ 1062 "(Unsafe,Unstable) " \ 1063 " Controls emission of inline sync fast-path code") \ 1064 \ 1065 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1066 \ 1067 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1068 \ 1069 product(intx, Atomics, 0, \ 1070 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1071 \ 1072 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1073 \ 1074 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1075 \ 1076 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1077 \ 1078 product(intx, hashCode, 0, \ 1079 "(Unstable) select hashCode generation algorithm" ) \ 1080 \ 1081 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1082 "(Unstable, Linux-specific)" \ 1083 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1084 \ 1085 product(bool, FilterSpuriousWakeups, true, \ 1086 "Prevent spurious or premature wakeups from object.wait " \ 1087 "(Solaris only)") \ 1088 \ 1089 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1090 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1091 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1092 \ 1093 develop(bool, UsePthreads, false, \ 1094 "Use pthread-based instead of libthread-based synchronization " \ 1095 "(SPARC only)") \ 1096 \ 1097 product(bool, AdjustConcurrency, false, \ 1098 "call thr_setconcurrency at thread create time to avoid " \ 1099 "LWP starvation on MP systems (For Solaris Only)") \ 1100 \ 1101 product(bool, ReduceSignalUsage, false, \ 1102 "Reduce the use of OS signals in Java and/or the VM") \ 1103 \ 1104 notproduct(bool, ValidateMarkSweep, false, \ 1105 "Do extra validation during MarkSweep collection") \ 1106 \ 1107 notproduct(bool, RecordMarkSweepCompaction, false, \ 1108 "Enable GC-to-GC recording and querying of compaction during " \ 1109 "MarkSweep") \ 1110 \ 1111 develop_pd(bool, ShareVtableStubs, \ 1112 "Share vtable stubs (smaller code but worse branch prediction") \ 1113 \ 1114 develop(bool, LoadLineNumberTables, true, \ 1115 "Tells whether the class file parser loads line number tables") \ 1116 \ 1117 develop(bool, LoadLocalVariableTables, true, \ 1118 "Tells whether the class file parser loads local variable tables")\ 1119 \ 1120 develop(bool, LoadLocalVariableTypeTables, true, \ 1121 "Tells whether the class file parser loads local variable type tables")\ 1122 \ 1123 product(bool, AllowUserSignalHandlers, false, \ 1124 "Do not complain if the application installs signal handlers " \ 1125 "(Solaris & Linux only)") \ 1126 \ 1127 product(bool, UseSignalChaining, true, \ 1128 "Use signal-chaining to invoke signal handlers installed " \ 1129 "by the application (Solaris & Linux only)") \ 1130 \ 1131 product(bool, UseAltSigs, false, \ 1132 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1133 "internal signals (Solaris only)") \ 1134 \ 1135 product(bool, AllowJNIEnvProxy, false, \ 1136 "Allow JNIEnv proxies for jdbx") \ 1137 \ 1138 product(bool, JNIDetachReleasesMonitors, true, \ 1139 "JNI DetachCurrentThread releases monitors owned by thread") \ 1140 \ 1141 product(bool, RestoreMXCSROnJNICalls, false, \ 1142 "Restore MXCSR when returning from JNI calls") \ 1143 \ 1144 product(bool, CheckJNICalls, false, \ 1145 "Verify all arguments to JNI calls") \ 1146 \ 1147 product(bool, UseFastJNIAccessors, true, \ 1148 "Use optimized versions of Get<Primitive>Field") \ 1149 \ 1150 product(bool, EagerXrunInit, false, \ 1151 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1152 " but not all -Xrun libraries may support the state of the VM at this time") \ 1153 \ 1154 product(bool, PreserveAllAnnotations, false, \ 1155 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1156 \ 1157 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1158 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1159 \ 1160 product(bool, LazyBootClassLoader, true, \ 1161 "Enable/disable lazy opening of boot class path entries") \ 1162 \ 1163 product(bool, UseXMMForArrayCopy, false, \ 1164 "Use SSE2 MOVQ instruction for Arraycopy") \ 1165 \ 1166 product(intx, FieldsAllocationStyle, 1, \ 1167 "0 - type based with oops first, 1 - with oops last, " \ 1168 "2 - oops in super and sub classes are together") \ 1169 \ 1170 product(bool, CompactFields, true, \ 1171 "Allocate nonstatic fields in gaps between previous fields") \ 1172 \ 1173 notproduct(bool, PrintCompactFieldsSavings, false, \ 1174 "Print how many words were saved with CompactFields") \ 1175 \ 1176 product(bool, UseBiasedLocking, true, \ 1177 "Enable biased locking in JVM") \ 1178 \ 1179 product(intx, BiasedLockingStartupDelay, 4000, \ 1180 "Number of milliseconds to wait before enabling biased locking") \ 1181 \ 1182 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1183 "Print statistics of biased locking in JVM") \ 1184 \ 1185 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1186 "Threshold of number of revocations per type to try to " \ 1187 "rebias all objects in the heap of that type") \ 1188 \ 1189 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1190 "Threshold of number of revocations per type to permanently " \ 1191 "revoke biases of all objects in the heap of that type") \ 1192 \ 1193 product(intx, BiasedLockingDecayTime, 25000, \ 1194 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1195 "type after previous bulk rebias") \ 1196 \ 1197 /* tracing */ \ 1198 \ 1199 notproduct(bool, TraceRuntimeCalls, false, \ 1200 "Trace run-time calls") \ 1201 \ 1202 develop(bool, TraceJNICalls, false, \ 1203 "Trace JNI calls") \ 1204 \ 1205 notproduct(bool, TraceJVMCalls, false, \ 1206 "Trace JVM calls") \ 1207 \ 1208 product(ccstr, TraceJVMTI, NULL, \ 1209 "Trace flags for JVMTI functions and events") \ 1210 \ 1211 /* This option can change an EMCP method into an obsolete method. */ \ 1212 /* This can affect tests that except specific methods to be EMCP. */ \ 1213 /* This option should be used with caution. */ \ 1214 product(bool, StressLdcRewrite, false, \ 1215 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1216 \ 1217 product(intx, TraceRedefineClasses, 0, \ 1218 "Trace level for JVMTI RedefineClasses") \ 1219 \ 1220 develop(bool, StressMethodComparator, false, \ 1221 "run the MethodComparator on all loaded methods") \ 1222 \ 1223 /* change to false by default sometime after Mustang */ \ 1224 product(bool, VerifyMergedCPBytecodes, true, \ 1225 "Verify bytecodes after RedefineClasses constant pool merging") \ 1226 \ 1227 develop(bool, TraceJNIHandleAllocation, false, \ 1228 "Trace allocation/deallocation of JNI handle blocks") \ 1229 \ 1230 develop(bool, TraceThreadEvents, false, \ 1231 "Trace all thread events") \ 1232 \ 1233 develop(bool, TraceBytecodes, false, \ 1234 "Trace bytecode execution") \ 1235 \ 1236 develop(bool, TraceClassInitialization, false, \ 1237 "Trace class initialization") \ 1238 \ 1239 develop(bool, TraceExceptions, false, \ 1240 "Trace exceptions") \ 1241 \ 1242 develop(bool, TraceICs, false, \ 1243 "Trace inline cache changes") \ 1244 \ 1245 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1246 "Trace method invocation counter overflow") \ 1247 \ 1248 develop(bool, TraceInlineCacheClearing, false, \ 1249 "Trace clearing of inline caches in nmethods") \ 1250 \ 1251 develop(bool, TraceDependencies, false, \ 1252 "Trace dependencies") \ 1253 \ 1254 develop(bool, VerifyDependencies, trueInDebug, \ 1255 "Exercise and verify the compilation dependency mechanism") \ 1256 \ 1257 develop(bool, TraceNewOopMapGeneration, false, \ 1258 "Trace OopMapGeneration") \ 1259 \ 1260 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1261 "Trace OopMapGeneration: print detailed cell states") \ 1262 \ 1263 develop(bool, TimeOopMap, false, \ 1264 "Time calls to GenerateOopMap::compute_map() in sum") \ 1265 \ 1266 develop(bool, TimeOopMap2, false, \ 1267 "Time calls to GenerateOopMap::compute_map() individually") \ 1268 \ 1269 develop(bool, TraceMonitorMismatch, false, \ 1270 "Trace monitor matching failures during OopMapGeneration") \ 1271 \ 1272 develop(bool, TraceOopMapRewrites, false, \ 1273 "Trace rewritting of method oops during oop map generation") \ 1274 \ 1275 develop(bool, TraceSafepoint, false, \ 1276 "Trace safepoint operations") \ 1277 \ 1278 develop(bool, TraceICBuffer, false, \ 1279 "Trace usage of IC buffer") \ 1280 \ 1281 develop(bool, TraceCompiledIC, false, \ 1282 "Trace changes of compiled IC") \ 1283 \ 1284 notproduct(bool, TraceZapDeadLocals, false, \ 1285 "Trace zapping dead locals") \ 1286 \ 1287 develop(bool, TraceStartupTime, false, \ 1288 "Trace setup time") \ 1289 \ 1290 develop(bool, TraceProtectionDomainVerification, false, \ 1291 "Trace protection domain verifcation") \ 1292 \ 1293 develop(bool, TraceClearedExceptions, false, \ 1294 "Prints when an exception is forcibly cleared") \ 1295 \ 1296 product(bool, TraceClassResolution, false, \ 1297 "Trace all constant pool resolutions (for debugging)") \ 1298 \ 1299 product(bool, TraceBiasedLocking, false, \ 1300 "Trace biased locking in JVM") \ 1301 \ 1302 product(bool, TraceMonitorInflation, false, \ 1303 "Trace monitor inflation in JVM") \ 1304 \ 1305 /* gc */ \ 1306 \ 1307 product(bool, UseSerialGC, false, \ 1308 "Use the serial garbage collector") \ 1309 \ 1310 product(bool, UseG1GC, false, \ 1311 "Use the Garbage-First garbage collector") \ 1312 \ 1313 product(bool, UseParallelGC, false, \ 1314 "Use the Parallel Scavenge garbage collector") \ 1315 \ 1316 product(bool, UseParallelOldGC, false, \ 1317 "Use the Parallel Old garbage collector") \ 1318 \ 1319 product(uintx, HeapMaximumCompactionInterval, 20, \ 1320 "How often should we maximally compact the heap (not allowing " \ 1321 "any dead space)") \ 1322 \ 1323 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1324 "The collection count for the first maximum compaction") \ 1325 \ 1326 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1327 "In the Parallel Old garbage collector maximum compaction for " \ 1328 "a system GC") \ 1329 \ 1330 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1331 "The mean used by the par compact dead wood" \ 1332 "limiter (a number between 0-100).") \ 1333 \ 1334 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1335 "The standard deviation used by the par compact dead wood" \ 1336 "limiter (a number between 0-100).") \ 1337 \ 1338 product(uintx, ParallelGCThreads, 0, \ 1339 "Number of parallel threads parallel gc will use") \ 1340 \ 1341 product(bool, UseDynamicNumberOfGCThreads, false, \ 1342 "Dynamically choose the number of parallel threads " \ 1343 "parallel gc will use") \ 1344 \ 1345 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1346 "Force dynamic selection of the number of" \ 1347 "parallel threads parallel gc will use to aid debugging") \ 1348 \ 1349 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1350 "Size of heap (bytes) per GC thread used in calculating the " \ 1351 "number of GC threads") \ 1352 \ 1353 product(bool, TraceDynamicGCThreads, false, \ 1354 "Trace the dynamic GC thread usage") \ 1355 \ 1356 develop(bool, ParallelOldGCSplitALot, false, \ 1357 "Provoke splitting (copying data from a young gen space to" \ 1358 "multiple destination spaces)") \ 1359 \ 1360 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1361 "How often to provoke splitting a young gen space") \ 1362 \ 1363 product(uintx, ConcGCThreads, 0, \ 1364 "Number of threads concurrent gc will use") \ 1365 \ 1366 product(uintx, YoungPLABSize, 4096, \ 1367 "Size of young gen promotion labs (in HeapWords)") \ 1368 \ 1369 product(uintx, OldPLABSize, 1024, \ 1370 "Size of old gen promotion labs (in HeapWords)") \ 1371 \ 1372 product(uintx, GCTaskTimeStampEntries, 200, \ 1373 "Number of time stamp entries per gc worker thread") \ 1374 \ 1375 product(bool, AlwaysTenure, false, \ 1376 "Always tenure objects in eden. (ParallelGC only)") \ 1377 \ 1378 product(bool, NeverTenure, false, \ 1379 "Never tenure objects in eden, May tenure on overflow " \ 1380 "(ParallelGC only)") \ 1381 \ 1382 product(bool, ScavengeBeforeFullGC, true, \ 1383 "Scavenge youngest generation before each full GC, " \ 1384 "used with UseParallelGC") \ 1385 \ 1386 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1387 "Allow scavenges to occur when to_space contains objects.") \ 1388 \ 1389 product(bool, UseConcMarkSweepGC, false, \ 1390 "Use Concurrent Mark-Sweep GC in the old generation") \ 1391 \ 1392 product(bool, ExplicitGCInvokesConcurrent, false, \ 1393 "A System.gc() request invokes a concurrent collection;" \ 1394 " (effective only when UseConcMarkSweepGC)") \ 1395 \ 1396 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1397 "A System.gc() request invokes a concurrent collection and " \ 1398 "also unloads classes during such a concurrent gc cycle " \ 1399 "(effective only when UseConcMarkSweepGC)") \ 1400 \ 1401 product(bool, GCLockerInvokesConcurrent, false, \ 1402 "The exit of a JNI CS necessitating a scavenge also" \ 1403 " kicks off a bkgrd concurrent collection") \ 1404 \ 1405 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1406 "How much the GC can expand the eden by while the GC locker " \ 1407 "is active (as a percentage)") \ 1408 \ 1409 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1410 "Use Adaptive Free Lists in the CMS generation") \ 1411 \ 1412 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1413 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1414 \ 1415 develop(bool, RotateCMSCollectionTypes, false, \ 1416 "Rotate the CMS collections among concurrent and STW") \ 1417 \ 1418 product(bool, UseCMSBestFit, true, \ 1419 "Use CMS best fit allocation strategy") \ 1420 \ 1421 product(bool, UseCMSCollectionPassing, true, \ 1422 "Use passing of collection from background to foreground") \ 1423 \ 1424 product(bool, UseParNewGC, false, \ 1425 "Use parallel threads in the new generation.") \ 1426 \ 1427 product(bool, ParallelGCVerbose, false, \ 1428 "Verbose output for parallel GC.") \ 1429 \ 1430 product(intx, ParallelGCBufferWastePct, 10, \ 1431 "wasted fraction of parallel allocation buffer.") \ 1432 \ 1433 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1434 "Retain parallel allocation buffers across scavenges; " \ 1435 " -- disabled because this currently conflicts with " \ 1436 " parallel card scanning under certain conditions ") \ 1437 \ 1438 product(intx, TargetPLABWastePct, 10, \ 1439 "target wasted space in last buffer as pct of overall allocation")\ 1440 \ 1441 product(uintx, PLABWeight, 75, \ 1442 "Percentage (0-100) used to weight the current sample when" \ 1443 "computing exponentially decaying average for ResizePLAB.") \ 1444 \ 1445 product(bool, ResizePLAB, true, \ 1446 "Dynamically resize (survivor space) promotion labs") \ 1447 \ 1448 product(bool, PrintPLAB, false, \ 1449 "Print (survivor space) promotion labs sizing decisions") \ 1450 \ 1451 product(intx, ParGCArrayScanChunk, 50, \ 1452 "Scan a subset and push remainder, if array is bigger than this") \ 1453 \ 1454 product(bool, ParGCUseLocalOverflow, false, \ 1455 "Instead of a global overflow list, use local overflow stacks") \ 1456 \ 1457 product(bool, ParGCTrimOverflow, true, \ 1458 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1459 \ 1460 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1461 "Whether we should simulate work queue overflow in ParNew") \ 1462 \ 1463 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1464 "An `interval' counter that determines how frequently " \ 1465 "we simulate overflow; a smaller number increases frequency") \ 1466 \ 1467 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1468 "The desired number of objects to claim from the overflow list") \ 1469 \ 1470 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1471 "The number of strides per worker thread that we divide up the " \ 1472 "card table scanning work into") \ 1473 \ 1474 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1475 "The number of cards in each chunk of the parallel chunks used " \ 1476 "during card table scanning") \ 1477 \ 1478 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1479 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1480 "parallel GC.") \ 1481 \ 1482 product(uintx, OldPLABWeight, 50, \ 1483 "Percentage (0-100) used to weight the current sample when" \ 1484 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1485 \ 1486 product(bool, ResizeOldPLAB, true, \ 1487 "Dynamically resize (old gen) promotion labs") \ 1488 \ 1489 product(bool, PrintOldPLAB, false, \ 1490 "Print (old gen) promotion labs sizing decisions") \ 1491 \ 1492 product(uintx, CMSOldPLABMin, 16, \ 1493 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1494 \ 1495 product(uintx, CMSOldPLABMax, 1024, \ 1496 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1497 \ 1498 product(uintx, CMSOldPLABNumRefills, 4, \ 1499 "Nominal number of refills of CMS gen promotion lab cache" \ 1500 " per worker per block size") \ 1501 \ 1502 product(bool, CMSOldPLABResizeQuicker, false, \ 1503 "Whether to react on-the-fly during a scavenge to a sudden" \ 1504 " change in block demand rate") \ 1505 \ 1506 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1507 "The tolerance of the phase-change detector for on-the-fly" \ 1508 " PLAB resizing during a scavenge") \ 1509 \ 1510 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1511 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1512 " during a scavenge") \ 1513 \ 1514 product(bool, AlwaysPreTouch, false, \ 1515 "It forces all freshly committed pages to be pre-touched.") \ 1516 \ 1517 product_pd(intx, CMSYoungGenPerWorker, \ 1518 "The maximum size of young gen chosen by default per GC worker " \ 1519 "thread available") \ 1520 \ 1521 product(bool, CMSIncrementalMode, false, \ 1522 "Whether CMS GC should operate in \"incremental\" mode") \ 1523 \ 1524 product(uintx, CMSIncrementalDutyCycle, 10, \ 1525 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1526 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1527 "value") \ 1528 \ 1529 product(bool, CMSIncrementalPacing, true, \ 1530 "Whether the CMS incremental mode duty cycle should be " \ 1531 "automatically adjusted") \ 1532 \ 1533 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1534 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1535 "enabled (a percentage, 0-100)") \ 1536 \ 1537 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1538 "Percentage (0-100) used to add conservatism when computing the " \ 1539 "duty cycle") \ 1540 \ 1541 product(uintx, CMSIncrementalOffset, 0, \ 1542 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1543 " is shifted to the right within the period between young GCs") \ 1544 \ 1545 product(uintx, CMSExpAvgFactor, 50, \ 1546 "Percentage (0-100) used to weight the current sample when" \ 1547 "computing exponential averages for CMS statistics.") \ 1548 \ 1549 product(uintx, CMS_FLSWeight, 75, \ 1550 "Percentage (0-100) used to weight the current sample when" \ 1551 "computing exponentially decating averages for CMS FLS statistics.") \ 1552 \ 1553 product(uintx, CMS_FLSPadding, 1, \ 1554 "The multiple of deviation from mean to use for buffering" \ 1555 "against volatility in free list demand.") \ 1556 \ 1557 product(uintx, FLSCoalescePolicy, 2, \ 1558 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1559 \ 1560 product(bool, FLSAlwaysCoalesceLarge, false, \ 1561 "CMS: Larger free blocks are always available for coalescing") \ 1562 \ 1563 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1564 "CMS: the smaller the percentage the greater the coalition force")\ 1565 \ 1566 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1567 "CMS: the factor by which to inflate estimated demand of small" \ 1568 " block sizes to prevent coalescing with an adjoining block") \ 1569 \ 1570 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1571 "CMS: the factor by which to inflate estimated demand of large" \ 1572 " block sizes to prevent coalescing with an adjoining block") \ 1573 \ 1574 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1575 "CMS: the factor by which to inflate estimated demand of small" \ 1576 " block sizes to prevent splitting to supply demand for smaller" \ 1577 " blocks") \ 1578 \ 1579 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1580 "CMS: the factor by which to inflate estimated demand of large" \ 1581 " block sizes to prevent splitting to supply demand for smaller" \ 1582 " blocks") \ 1583 \ 1584 product(bool, CMSExtrapolateSweep, false, \ 1585 "CMS: cushion for block demand during sweep") \ 1586 \ 1587 product(uintx, CMS_SweepWeight, 75, \ 1588 "Percentage (0-100) used to weight the current sample when " \ 1589 "computing exponentially decaying average for inter-sweep " \ 1590 "duration") \ 1591 \ 1592 product(uintx, CMS_SweepPadding, 1, \ 1593 "The multiple of deviation from mean to use for buffering " \ 1594 "against volatility in inter-sweep duration.") \ 1595 \ 1596 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1597 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1598 "duration exceeds this threhold in milliseconds") \ 1599 \ 1600 develop(bool, CMSTraceIncrementalMode, false, \ 1601 "Trace CMS incremental mode") \ 1602 \ 1603 develop(bool, CMSTraceIncrementalPacing, false, \ 1604 "Trace CMS incremental mode pacing computation") \ 1605 \ 1606 develop(bool, CMSTraceThreadState, false, \ 1607 "Trace the CMS thread state (enable the trace_state() method)") \ 1608 \ 1609 product(bool, CMSClassUnloadingEnabled, false, \ 1610 "Whether class unloading enabled when using CMS GC") \ 1611 \ 1612 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1613 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1614 " for which classes may not be unloaded") \ 1615 \ 1616 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1617 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1618 \ 1619 product(bool, UseCMSCompactAtFullCollection, true, \ 1620 "Use mark sweep compact at full collections") \ 1621 \ 1622 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1623 "Number of CMS full collection done before compaction if > 0") \ 1624 \ 1625 develop(intx, CMSDictionaryChoice, 0, \ 1626 "Use BinaryTreeDictionary as default in the CMS generation") \ 1627 \ 1628 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1629 "Replenish an indexed free list with this number of chunks") \ 1630 \ 1631 product(bool, CMSReplenishIntermediate, true, \ 1632 "Replenish all intermediate free-list caches") \ 1633 \ 1634 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1635 "When satisfying batched demand, split blocks from the " \ 1636 "IndexedFreeList whose size is a multiple of requested size") \ 1637 \ 1638 product(bool, CMSLoopWarn, false, \ 1639 "Warn in case of excessive CMS looping") \ 1640 \ 1641 develop(bool, CMSOverflowEarlyRestoration, false, \ 1642 "Whether preserved marks should be restored early") \ 1643 \ 1644 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1645 "Size of marking stack") \ 1646 \ 1647 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1648 "Max size of marking stack") \ 1649 \ 1650 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1651 "Whether we should simulate frequent marking stack / work queue" \ 1652 " overflow") \ 1653 \ 1654 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1655 "An `interval' counter that determines how frequently" \ 1656 " we simulate overflow; a smaller number increases frequency") \ 1657 \ 1658 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1659 "(Temporary, subject to experimentation)" \ 1660 "Maximum number of abortable preclean iterations, if > 0") \ 1661 \ 1662 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1663 "(Temporary, subject to experimentation)" \ 1664 "Maximum time in abortable preclean in ms") \ 1665 \ 1666 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1667 "(Temporary, subject to experimentation)" \ 1668 "Nominal minimum work per abortable preclean iteration") \ 1669 \ 1670 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1671 "(Temporary, subject to experimentation)" \ 1672 " Time that we sleep between iterations when not given" \ 1673 " enough work per iteration") \ 1674 \ 1675 product(uintx, CMSRescanMultiple, 32, \ 1676 "Size (in cards) of CMS parallel rescan task") \ 1677 \ 1678 product(uintx, CMSConcMarkMultiple, 32, \ 1679 "Size (in cards) of CMS concurrent MT marking task") \ 1680 \ 1681 product(bool, CMSAbortSemantics, false, \ 1682 "Whether abort-on-overflow semantics is implemented") \ 1683 \ 1684 product(bool, CMSParallelRemarkEnabled, true, \ 1685 "Whether parallel remark enabled (only if ParNewGC)") \ 1686 \ 1687 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1688 "Whether parallel remark of survivor space" \ 1689 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1690 \ 1691 product(bool, CMSPLABRecordAlways, true, \ 1692 "Whether to always record survivor space PLAB bdries" \ 1693 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1694 \ 1695 product(bool, CMSConcurrentMTEnabled, true, \ 1696 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1697 \ 1698 product(bool, CMSPrecleaningEnabled, true, \ 1699 "Whether concurrent precleaning enabled") \ 1700 \ 1701 product(uintx, CMSPrecleanIter, 3, \ 1702 "Maximum number of precleaning iteration passes") \ 1703 \ 1704 product(uintx, CMSPrecleanNumerator, 2, \ 1705 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1706 " ratio") \ 1707 \ 1708 product(uintx, CMSPrecleanDenominator, 3, \ 1709 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1710 " ratio") \ 1711 \ 1712 product(bool, CMSPrecleanRefLists1, true, \ 1713 "Preclean ref lists during (initial) preclean phase") \ 1714 \ 1715 product(bool, CMSPrecleanRefLists2, false, \ 1716 "Preclean ref lists during abortable preclean phase") \ 1717 \ 1718 product(bool, CMSPrecleanSurvivors1, false, \ 1719 "Preclean survivors during (initial) preclean phase") \ 1720 \ 1721 product(bool, CMSPrecleanSurvivors2, true, \ 1722 "Preclean survivors during abortable preclean phase") \ 1723 \ 1724 product(uintx, CMSPrecleanThreshold, 1000, \ 1725 "Don't re-iterate if #dirty cards less than this") \ 1726 \ 1727 product(bool, CMSCleanOnEnter, true, \ 1728 "Clean-on-enter optimization for reducing number of dirty cards") \ 1729 \ 1730 product(uintx, CMSRemarkVerifyVariant, 1, \ 1731 "Choose variant (1,2) of verification following remark") \ 1732 \ 1733 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1734 "If Eden used is below this value, don't try to schedule remark") \ 1735 \ 1736 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1737 "The Eden occupancy % at which to try and schedule remark pause") \ 1738 \ 1739 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1740 "Start sampling Eden top at least before yg occupancy reaches" \ 1741 " 1/<ratio> of the size at which we plan to schedule remark") \ 1742 \ 1743 product(uintx, CMSSamplingGrain, 16*K, \ 1744 "The minimum distance between eden samples for CMS (see above)") \ 1745 \ 1746 product(bool, CMSScavengeBeforeRemark, false, \ 1747 "Attempt scavenge before the CMS remark step") \ 1748 \ 1749 develop(bool, CMSTraceSweeper, false, \ 1750 "Trace some actions of the CMS sweeper") \ 1751 \ 1752 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1753 "Don't drain below this size per parallel worker/thief") \ 1754 \ 1755 manageable(intx, CMSWaitDuration, 2000, \ 1756 "Time in milliseconds that CMS thread waits for young GC") \ 1757 \ 1758 product(bool, CMSYield, true, \ 1759 "Yield between steps of concurrent mark & sweep") \ 1760 \ 1761 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1762 "Bitmap operations should process at most this many bits" \ 1763 "between yields") \ 1764 \ 1765 product(bool, CMSDumpAtPromotionFailure, false, \ 1766 "Dump useful information about the state of the CMS old " \ 1767 " generation upon a promotion failure.") \ 1768 \ 1769 product(bool, CMSPrintChunksInDump, false, \ 1770 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1771 " more detailed information about the free chunks.") \ 1772 \ 1773 product(bool, CMSPrintObjectsInDump, false, \ 1774 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1775 " more detailed information about the allocated objects.") \ 1776 \ 1777 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1778 "Verify that all refs across the FLS boundary " \ 1779 " are to valid objects") \ 1780 \ 1781 diagnostic(bool, FLSVerifyLists, false, \ 1782 "Do lots of (expensive) FreeListSpace verification") \ 1783 \ 1784 diagnostic(bool, FLSVerifyIndexTable, false, \ 1785 "Do lots of (expensive) FLS index table verification") \ 1786 \ 1787 develop(bool, FLSVerifyDictionary, false, \ 1788 "Do lots of (expensive) FLS dictionary verification") \ 1789 \ 1790 develop(bool, VerifyBlockOffsetArray, false, \ 1791 "Do (expensive!) block offset array verification") \ 1792 \ 1793 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1794 "Maintain _unallocated_block in BlockOffsetArray" \ 1795 " (currently applicable only to CMS collector)") \ 1796 \ 1797 develop(bool, TraceCMSState, false, \ 1798 "Trace the state of the CMS collection") \ 1799 \ 1800 product(intx, RefDiscoveryPolicy, 0, \ 1801 "Whether reference-based(0) or referent-based(1)") \ 1802 \ 1803 product(bool, ParallelRefProcEnabled, false, \ 1804 "Enable parallel reference processing whenever possible") \ 1805 \ 1806 product(bool, ParallelRefProcBalancingEnabled, true, \ 1807 "Enable balancing of reference processing queues") \ 1808 \ 1809 product(intx, CMSTriggerRatio, 80, \ 1810 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1811 "allocated before a CMS collection cycle commences") \ 1812 \ 1813 product(uintx, CMSBootstrapOccupancy, 50, \ 1814 "Percentage CMS generation occupancy at which to " \ 1815 "initiate CMS collection for bootstrapping collection stats") \ 1816 \ 1817 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1818 "Percentage CMS generation occupancy to start a CMS collection " \ 1819 "cycle. A negative value means that CMSTriggerRatio is used") \ 1820 \ 1821 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1822 "Percentage of the (entire) heap occupancy to start a " \ 1823 "concurrent GC cycle. It us used by GCs that trigger a " \ 1824 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1825 "not just one of the generations (e.g., G1). A value of 0 " \ 1826 "denotes 'do constant GC cycles'.") \ 1827 \ 1828 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1829 "Only use occupancy as a crierion for starting a CMS collection") \ 1830 \ 1831 product(intx, CMSIsTooFullPercentage, 98, \ 1832 "An absolute ceiling above which CMS will always consider the " \ 1833 "perm gen ripe for collection") \ 1834 \ 1835 develop(bool, CMSTestInFreeList, false, \ 1836 "Check if the coalesced range is already in the " \ 1837 "free lists as claimed") \ 1838 \ 1839 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1840 "Check that all the garbage collected was returned to the " \ 1841 "free lists.") \ 1842 \ 1843 notproduct(bool, ScavengeALot, false, \ 1844 "Force scavenge at every Nth exit from the runtime system " \ 1845 "(N=ScavengeALotInterval)") \ 1846 \ 1847 develop(bool, FullGCALot, false, \ 1848 "Force full gc at every Nth exit from the runtime system " \ 1849 "(N=FullGCALotInterval)") \ 1850 \ 1851 notproduct(bool, GCALotAtAllSafepoints, false, \ 1852 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1853 \ 1854 product(bool, PrintPromotionFailure, false, \ 1855 "Print additional diagnostic information following " \ 1856 " promotion failure") \ 1857 \ 1858 notproduct(bool, PromotionFailureALot, false, \ 1859 "Use promotion failure handling on every youngest generation " \ 1860 "collection") \ 1861 \ 1862 develop(uintx, PromotionFailureALotCount, 1000, \ 1863 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1864 "refill attempts (ParNew) or promotion attempts " \ 1865 "(other young collectors) ") \ 1866 \ 1867 develop(uintx, PromotionFailureALotInterval, 5, \ 1868 "Total collections between promotion failures alot") \ 1869 \ 1870 experimental(intx, WorkStealingSleepMillis, 1, \ 1871 "Sleep time when sleep is used for yields") \ 1872 \ 1873 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1874 "Number of yields before a sleep is done during workstealing") \ 1875 \ 1876 experimental(uintx, WorkStealingHardSpins, 4096, \ 1877 "Number of iterations in a spin loop between checks on " \ 1878 "time out of hard spin") \ 1879 \ 1880 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1881 "Ratio of hard spins to calls to yield") \ 1882 \ 1883 develop(uintx, ObjArrayMarkingStride, 512, \ 1884 "Number of ObjArray elements to push onto the marking stack" \ 1885 "before pushing a continuation entry") \ 1886 \ 1887 develop(bool, MetadataAllocationFailALot, false, \ 1888 "Fail metadata allocations at intervals controlled by " \ 1889 "MetadataAllocationFailALotInterval") \ 1890 \ 1891 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1892 "metadata allocation failure alot interval") \ 1893 \ 1894 develop(bool, MetaDataDeallocateALot, false, \ 1895 "Deallocation bunches of metadata at intervals controlled by " \ 1896 "MetaDataAllocateALotInterval") \ 1897 \ 1898 develop(uintx, MetaDataDeallocateALotInterval, 100, \ 1899 "Metadata deallocation alot interval") \ 1900 \ 1901 develop(bool, TraceMetadataChunkAllocation, false, \ 1902 "Trace humongous metadata allocations") \ 1903 \ 1904 product(bool, TraceMetadataHumongousAllocation, false, \ 1905 "Trace humongous metadata allocations") \ 1906 \ 1907 develop(bool, TraceMetavirtualspaceAllocation, false, \ 1908 "Trace humongous metadata allocations") \ 1909 \ 1910 notproduct(bool, ExecuteInternalVMTests, false, \ 1911 "Enable execution of internal VM tests.") \ 1912 \ 1913 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1914 \ 1915 product_pd(bool, ResizeTLAB, \ 1916 "Dynamically resize tlab size for threads") \ 1917 \ 1918 product(bool, ZeroTLAB, false, \ 1919 "Zero out the newly created TLAB") \ 1920 \ 1921 product(bool, FastTLABRefill, true, \ 1922 "Use fast TLAB refill code") \ 1923 \ 1924 product(bool, PrintTLAB, false, \ 1925 "Print various TLAB related information") \ 1926 \ 1927 product(bool, TLABStats, true, \ 1928 "Print various TLAB related information") \ 1929 \ 1930 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 1931 "Enable LowMemoryProtection")) \ 1932 \ 1933 product_pd(bool, NeverActAsServerClassMachine, \ 1934 "Never act like a server-class machine") \ 1935 \ 1936 product(bool, AlwaysActAsServerClassMachine, false, \ 1937 "Always act like a server-class machine") \ 1938 \ 1939 product_pd(uint64_t, MaxRAM, \ 1940 "Real memory size (in bytes) used to set maximum heap size") \ 1941 \ 1942 product(uintx, ErgoHeapSizeLimit, 0, \ 1943 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1944 "MaxRAM / MaxRAMFraction") \ 1945 \ 1946 product(uintx, MaxRAMFraction, 4, \ 1947 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1948 "size") \ 1949 \ 1950 product(uintx, DefaultMaxRAMFraction, 4, \ 1951 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1952 "size; deprecated: to be renamed to MaxRAMFraction") \ 1953 \ 1954 product(uintx, MinRAMFraction, 2, \ 1955 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1956 "size on systems with small physical memory size") \ 1957 \ 1958 product(uintx, InitialRAMFraction, 64, \ 1959 "Fraction (1/n) of real memory used for initial heap size") \ 1960 \ 1961 product(bool, UseAutoGCSelectPolicy, false, \ 1962 "Use automatic collection selection policy") \ 1963 \ 1964 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1965 "Automatic GC selection pause threshhold in ms") \ 1966 \ 1967 product(bool, UseAdaptiveSizePolicy, true, \ 1968 "Use adaptive generation sizing policies") \ 1969 \ 1970 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1971 "Use adaptive survivor sizing policies") \ 1972 \ 1973 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1974 "Use adaptive young-old sizing policies at minor collections") \ 1975 \ 1976 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1977 "Use adaptive young-old sizing policies at major collections") \ 1978 \ 1979 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1980 "Use statistics from System.GC for adaptive size policy") \ 1981 \ 1982 product(bool, UseAdaptiveGCBoundary, false, \ 1983 "Allow young-old boundary to move") \ 1984 \ 1985 develop(bool, TraceAdaptiveGCBoundary, false, \ 1986 "Trace young-old boundary moves") \ 1987 \ 1988 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1989 "Resize the virtual spaces of the young or old generations") \ 1990 \ 1991 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1992 "Policy for changeing generation size for throughput goals") \ 1993 \ 1994 product(uintx, AdaptiveSizePausePolicy, 0, \ 1995 "Policy for changing generation size for pause goals") \ 1996 \ 1997 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1998 "Adjust tenured generation to achive a minor pause goal") \ 1999 \ 2000 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2001 "Adjust young generation to achive a major pause goal") \ 2002 \ 2003 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2004 "Number of steps where heuristics is used before data is used") \ 2005 \ 2006 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2007 "Number of collections before the adaptive sizing is started") \ 2008 \ 2009 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2010 "Collecton interval for printing information; zero => never") \ 2011 \ 2012 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2013 "Use adaptive minimum footprint as a goal") \ 2014 \ 2015 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2016 "Weight given to exponential resizing, between 0 and 100") \ 2017 \ 2018 product(uintx, AdaptiveTimeWeight, 25, \ 2019 "Weight given to time in adaptive policy, between 0 and 100") \ 2020 \ 2021 product(uintx, PausePadding, 1, \ 2022 "How much buffer to keep for pause time") \ 2023 \ 2024 product(uintx, PromotedPadding, 3, \ 2025 "How much buffer to keep for promotion failure") \ 2026 \ 2027 product(uintx, SurvivorPadding, 3, \ 2028 "How much buffer to keep for survivor overflow") \ 2029 \ 2030 product(uintx, ThresholdTolerance, 10, \ 2031 "Allowed collection cost difference between generations") \ 2032 \ 2033 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2034 "If collection costs are within margin, reduce both by full " \ 2035 "delta") \ 2036 \ 2037 product(uintx, YoungGenerationSizeIncrement, 20, \ 2038 "Adaptive size percentage change in young generation") \ 2039 \ 2040 product(uintx, YoungGenerationSizeSupplement, 80, \ 2041 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2042 \ 2043 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2044 "Decay factor to YoungedGenerationSizeSupplement") \ 2045 \ 2046 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2047 "Adaptive size percentage change in tenured generation") \ 2048 \ 2049 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2050 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2051 \ 2052 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2053 "Decay factor to TenuredGenerationSizeIncrement") \ 2054 \ 2055 product(uintx, MaxGCPauseMillis, max_uintx, \ 2056 "Adaptive size policy maximum GC pause time goal in msec, " \ 2057 "or (G1 Only) the max. GC time per MMU time slice") \ 2058 \ 2059 product(uintx, GCPauseIntervalMillis, 0, \ 2060 "Time slice for MMU specification") \ 2061 \ 2062 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2063 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2064 \ 2065 product(uintx, GCTimeRatio, 99, \ 2066 "Adaptive size policy application time to GC time ratio") \ 2067 \ 2068 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2069 "Adaptive size scale down factor for shrinking") \ 2070 \ 2071 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2072 "Adaptive size decays the major cost for long major intervals") \ 2073 \ 2074 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2075 "Time scale over which major costs decay") \ 2076 \ 2077 product(uintx, MinSurvivorRatio, 3, \ 2078 "Minimum ratio of young generation/survivor space size") \ 2079 \ 2080 product(uintx, InitialSurvivorRatio, 8, \ 2081 "Initial ratio of eden/survivor space size") \ 2082 \ 2083 product(uintx, BaseFootPrintEstimate, 256*M, \ 2084 "Estimate of footprint other than Java Heap") \ 2085 \ 2086 product(bool, UseGCOverheadLimit, true, \ 2087 "Use policy to limit of proportion of time spent in GC " \ 2088 "before an OutOfMemory error is thrown") \ 2089 \ 2090 product(uintx, GCTimeLimit, 98, \ 2091 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2092 "error is thrown (used with GCHeapFreeLimit)") \ 2093 \ 2094 product(uintx, GCHeapFreeLimit, 2, \ 2095 "Minimum percentage of free space after a full GC before an " \ 2096 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2097 \ 2098 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2099 "Number of consecutive collections before gc time limit fires") \ 2100 \ 2101 product(bool, PrintAdaptiveSizePolicy, false, \ 2102 "Print information about AdaptiveSizePolicy") \ 2103 \ 2104 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2105 "How far ahead to prefetch destination area (<= 0 means off)") \ 2106 \ 2107 product(intx, PrefetchScanIntervalInBytes, -1, \ 2108 "How far ahead to prefetch scan area (<= 0 means off)") \ 2109 \ 2110 product(intx, PrefetchFieldsAhead, -1, \ 2111 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2112 \ 2113 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2114 "Verify system before exiting") \ 2115 \ 2116 diagnostic(bool, VerifyBeforeGC, false, \ 2117 "Verify memory system before GC") \ 2118 \ 2119 diagnostic(bool, VerifyAfterGC, false, \ 2120 "Verify memory system after GC") \ 2121 \ 2122 diagnostic(bool, VerifyDuringGC, false, \ 2123 "Verify memory system during GC (between phases)") \ 2124 \ 2125 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2126 "Enable parallel memory system verification") \ 2127 \ 2128 diagnostic(bool, DeferInitialCardMark, false, \ 2129 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2130 "may arise from new_pre_store_barrier") \ 2131 \ 2132 diagnostic(bool, VerifyRememberedSets, false, \ 2133 "Verify GC remembered sets") \ 2134 \ 2135 diagnostic(bool, VerifyObjectStartArray, true, \ 2136 "Verify GC object start array if verify before/after") \ 2137 \ 2138 product(bool, DisableExplicitGC, false, \ 2139 "Tells whether calling System.gc() does a full GC") \ 2140 \ 2141 notproduct(bool, CheckMemoryInitialization, false, \ 2142 "Checks memory initialization") \ 2143 \ 2144 product(bool, CollectGen0First, false, \ 2145 "Collect youngest generation before each full GC") \ 2146 \ 2147 diagnostic(bool, BindCMSThreadToCPU, false, \ 2148 "Bind CMS Thread to CPU if possible") \ 2149 \ 2150 diagnostic(uintx, CPUForCMSThread, 0, \ 2151 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2152 \ 2153 product(bool, BindGCTaskThreadsToCPUs, false, \ 2154 "Bind GCTaskThreads to CPUs if possible") \ 2155 \ 2156 product(bool, UseGCTaskAffinity, false, \ 2157 "Use worker affinity when asking for GCTasks") \ 2158 \ 2159 product(uintx, ProcessDistributionStride, 4, \ 2160 "Stride through processors when distributing processes") \ 2161 \ 2162 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2163 "number of times the coordinator GC thread will sleep while " \ 2164 "yielding before giving up and resuming GC") \ 2165 \ 2166 product(uintx, CMSYieldSleepCount, 0, \ 2167 "number of times a GC thread (minus the coordinator) " \ 2168 "will sleep while yielding before giving up and resuming GC") \ 2169 \ 2170 /* gc tracing */ \ 2171 manageable(bool, PrintGC, false, \ 2172 "Print message at garbage collect") \ 2173 \ 2174 manageable(bool, PrintGCDetails, false, \ 2175 "Print more details at garbage collect") \ 2176 \ 2177 manageable(bool, PrintGCDateStamps, false, \ 2178 "Print date stamps at garbage collect") \ 2179 \ 2180 manageable(bool, PrintGCTimeStamps, false, \ 2181 "Print timestamps at garbage collect") \ 2182 \ 2183 product(bool, PrintGCTaskTimeStamps, false, \ 2184 "Print timestamps for individual gc worker thread tasks") \ 2185 \ 2186 develop(intx, ConcGCYieldTimeout, 0, \ 2187 "If non-zero, assert that GC threads yield within this # of ms.") \ 2188 \ 2189 notproduct(bool, TraceMarkSweep, false, \ 2190 "Trace mark sweep") \ 2191 \ 2192 product(bool, PrintReferenceGC, false, \ 2193 "Print times spent handling reference objects during GC " \ 2194 " (enabled only when PrintGCDetails)") \ 2195 \ 2196 develop(bool, TraceReferenceGC, false, \ 2197 "Trace handling of soft/weak/final/phantom references") \ 2198 \ 2199 develop(bool, TraceFinalizerRegistration, false, \ 2200 "Trace registration of final references") \ 2201 \ 2202 notproduct(bool, TraceScavenge, false, \ 2203 "Trace scavenge") \ 2204 \ 2205 product_rw(bool, TraceClassLoading, false, \ 2206 "Trace all classes loaded") \ 2207 \ 2208 product(bool, TraceClassLoadingPreorder, false, \ 2209 "Trace all classes loaded in order referenced (not loaded)") \ 2210 \ 2211 product_rw(bool, TraceClassUnloading, false, \ 2212 "Trace unloading of classes") \ 2213 \ 2214 product_rw(bool, TraceLoaderConstraints, false, \ 2215 "Trace loader constraints") \ 2216 \ 2217 develop(bool, TraceClassLoaderData, false, \ 2218 "Trace class loader loader_data lifetime") \ 2219 \ 2220 product(uintx, InitialBootClassLoaderMetaspaceSize, 3*M, \ 2221 "Initial size of the boot class loader data metaspace") \ 2222 \ 2223 product(bool, TraceGen0Time, false, \ 2224 "Trace accumulated time for Gen 0 collection") \ 2225 \ 2226 product(bool, TraceGen1Time, false, \ 2227 "Trace accumulated time for Gen 1 collection") \ 2228 \ 2229 product(bool, PrintTenuringDistribution, false, \ 2230 "Print tenuring age information") \ 2231 \ 2232 product_rw(bool, PrintHeapAtGC, false, \ 2233 "Print heap layout before and after each GC") \ 2234 \ 2235 product_rw(bool, PrintHeapAtGCExtended, false, \ 2236 "Prints extended information about the layout of the heap " \ 2237 "when -XX:+PrintHeapAtGC is set") \ 2238 \ 2239 product(bool, PrintHeapAtSIGBREAK, true, \ 2240 "Print heap layout in response to SIGBREAK") \ 2241 \ 2242 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2243 "Print a class histogram before any major stop-world GC") \ 2244 \ 2245 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2246 "Print a class histogram after any major stop-world GC") \ 2247 \ 2248 manageable(bool, PrintClassHistogram, false, \ 2249 "Print a histogram of class instances") \ 2250 \ 2251 develop(bool, TraceWorkGang, false, \ 2252 "Trace activities of work gangs") \ 2253 \ 2254 product(bool, TraceParallelOldGCTasks, false, \ 2255 "Trace multithreaded GC activity") \ 2256 \ 2257 develop(bool, TraceBlockOffsetTable, false, \ 2258 "Print BlockOffsetTable maps") \ 2259 \ 2260 develop(bool, TraceCardTableModRefBS, false, \ 2261 "Print CardTableModRefBS maps") \ 2262 \ 2263 develop(bool, TraceGCTaskManager, false, \ 2264 "Trace actions of the GC task manager") \ 2265 \ 2266 develop(bool, TraceGCTaskQueue, false, \ 2267 "Trace actions of the GC task queues") \ 2268 \ 2269 diagnostic(bool, TraceGCTaskThread, false, \ 2270 "Trace actions of the GC task threads") \ 2271 \ 2272 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2273 "Print the time taken by each parallel old gc phase." \ 2274 "PrintGCDetails must also be enabled.") \ 2275 \ 2276 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2277 "Trace parallel old gc marking phase") \ 2278 \ 2279 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2280 "Trace parallel old gc summary phase") \ 2281 \ 2282 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2283 "Trace parallel old gc compaction phase") \ 2284 \ 2285 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2286 "Trace parallel old gc dense prefix computation") \ 2287 \ 2288 develop(bool, IgnoreLibthreadGPFault, false, \ 2289 "Suppress workaround for libthread GP fault") \ 2290 \ 2291 product(bool, PrintJNIGCStalls, false, \ 2292 "Print diagnostic message when GC is stalled" \ 2293 "by JNI critical section") \ 2294 \ 2295 /* GC log rotation setting */ \ 2296 \ 2297 product(bool, UseGCLogFileRotation, false, \ 2298 "Prevent large gclog file for long running app. " \ 2299 "Requires -Xloggc:<filename>") \ 2300 \ 2301 product(uintx, NumberOfGCLogFiles, 0, \ 2302 "Number of gclog files in rotation, " \ 2303 "Default: 0, no rotation") \ 2304 \ 2305 product(uintx, GCLogFileSize, 0, \ 2306 "GC log file size, Default: 0 bytes, no rotation " \ 2307 "Only valid with UseGCLogFileRotation") \ 2308 \ 2309 /* JVMTI heap profiling */ \ 2310 \ 2311 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2312 "Trace JVMTI object tagging calls") \ 2313 \ 2314 diagnostic(bool, VerifyBeforeIteration, false, \ 2315 "Verify memory system before JVMTI iteration") \ 2316 \ 2317 /* compiler interface */ \ 2318 \ 2319 develop(bool, CIPrintCompilerName, false, \ 2320 "when CIPrint is active, print the name of the active compiler") \ 2321 \ 2322 develop(bool, CIPrintCompileQueue, false, \ 2323 "display the contents of the compile queue whenever a " \ 2324 "compilation is enqueued") \ 2325 \ 2326 develop(bool, CIPrintRequests, false, \ 2327 "display every request for compilation") \ 2328 \ 2329 product(bool, CITime, false, \ 2330 "collect timing information for compilation") \ 2331 \ 2332 develop(bool, CITimeEach, false, \ 2333 "display timing information after each successful compilation") \ 2334 \ 2335 develop(bool, CICountOSR, false, \ 2336 "use a separate counter when assigning ids to osr compilations") \ 2337 \ 2338 develop(bool, CICompileNatives, true, \ 2339 "compile native methods if supported by the compiler") \ 2340 \ 2341 develop_pd(bool, CICompileOSR, \ 2342 "compile on stack replacement methods if supported by the " \ 2343 "compiler") \ 2344 \ 2345 develop(bool, CIPrintMethodCodes, false, \ 2346 "print method bytecodes of the compiled code") \ 2347 \ 2348 develop(bool, CIPrintTypeFlow, false, \ 2349 "print the results of ciTypeFlow analysis") \ 2350 \ 2351 develop(bool, CITraceTypeFlow, false, \ 2352 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2353 \ 2354 develop(intx, OSROnlyBCI, -1, \ 2355 "OSR only at this bci. Negative values mean exclude that bci") \ 2356 \ 2357 /* compiler */ \ 2358 \ 2359 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2360 "Number of compiler threads to run") \ 2361 \ 2362 product(intx, CompilationPolicyChoice, 0, \ 2363 "which compilation policy (0/1)") \ 2364 \ 2365 develop(bool, UseStackBanging, true, \ 2366 "use stack banging for stack overflow checks (required for " \ 2367 "proper StackOverflow handling; disable only to measure cost " \ 2368 "of stackbanging)") \ 2369 \ 2370 develop(bool, UseStrictFP, true, \ 2371 "use strict fp if modifier strictfp is set") \ 2372 \ 2373 develop(bool, GenerateSynchronizationCode, true, \ 2374 "generate locking/unlocking code for synchronized methods and " \ 2375 "monitors") \ 2376 \ 2377 develop(bool, GenerateCompilerNullChecks, true, \ 2378 "Generate explicit null checks for loads/stores/calls") \ 2379 \ 2380 develop(bool, GenerateRangeChecks, true, \ 2381 "Generate range checks for array accesses") \ 2382 \ 2383 develop_pd(bool, ImplicitNullChecks, \ 2384 "generate code for implicit null checks") \ 2385 \ 2386 product(bool, PrintSafepointStatistics, false, \ 2387 "print statistics about safepoint synchronization") \ 2388 \ 2389 product(intx, PrintSafepointStatisticsCount, 300, \ 2390 "total number of safepoint statistics collected " \ 2391 "before printing them out") \ 2392 \ 2393 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2394 "print safepoint statistics only when safepoint takes" \ 2395 " more than PrintSafepointSatisticsTimeout in millis") \ 2396 \ 2397 product(bool, TraceSafepointCleanupTime, false, \ 2398 "print the break down of clean up tasks performed during" \ 2399 " safepoint") \ 2400 \ 2401 product(bool, Inline, true, \ 2402 "enable inlining") \ 2403 \ 2404 product(bool, ClipInlining, true, \ 2405 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2406 \ 2407 develop(bool, UseCHA, true, \ 2408 "enable CHA") \ 2409 \ 2410 product(bool, UseTypeProfile, true, \ 2411 "Check interpreter profile for historically monomorphic calls") \ 2412 \ 2413 notproduct(bool, TimeCompiler, false, \ 2414 "time the compiler") \ 2415 \ 2416 diagnostic(bool, PrintInlining, false, \ 2417 "prints inlining optimizations") \ 2418 \ 2419 product(bool, UsePopCountInstruction, false, \ 2420 "Use population count instruction") \ 2421 \ 2422 develop(bool, EagerInitialization, false, \ 2423 "Eagerly initialize classes if possible") \ 2424 \ 2425 develop(bool, TraceMethodReplacement, false, \ 2426 "Print when methods are replaced do to recompilation") \ 2427 \ 2428 develop(bool, PrintMethodFlushing, false, \ 2429 "print the nmethods being flushed") \ 2430 \ 2431 develop(bool, UseRelocIndex, false, \ 2432 "use an index to speed random access to relocations") \ 2433 \ 2434 develop(bool, StressCodeBuffers, false, \ 2435 "Exercise code buffer expansion and other rare state changes") \ 2436 \ 2437 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2438 "Generate extra debugging info for non-safepoints in nmethods") \ 2439 \ 2440 product(bool, PrintVMOptions, false, \ 2441 "Print flags that appeared on the command line") \ 2442 \ 2443 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2444 "Ignore unrecognized VM options") \ 2445 \ 2446 product(bool, PrintCommandLineFlags, false, \ 2447 "Print flags specified on command line or set by ergonomics") \ 2448 \ 2449 product(bool, PrintFlagsInitial, false, \ 2450 "Print all VM flags before argument processing and exit VM") \ 2451 \ 2452 product(bool, PrintFlagsFinal, false, \ 2453 "Print all VM flags after argument and ergonomic processing") \ 2454 \ 2455 notproduct(bool, PrintFlagsWithComments, false, \ 2456 "Print all VM flags with default values and descriptions and exit")\ 2457 \ 2458 diagnostic(bool, SerializeVMOutput, true, \ 2459 "Use a mutex to serialize output to tty and hotspot.log") \ 2460 \ 2461 diagnostic(bool, DisplayVMOutput, true, \ 2462 "Display all VM output on the tty, independently of LogVMOutput") \ 2463 \ 2464 diagnostic(bool, LogVMOutput, trueInDebug, \ 2465 "Save VM output to hotspot.log, or to LogFile") \ 2466 \ 2467 diagnostic(ccstr, LogFile, NULL, \ 2468 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2469 \ 2470 product(ccstr, ErrorFile, NULL, \ 2471 "If an error occurs, save the error data to this file " \ 2472 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2473 \ 2474 product(bool, DisplayVMOutputToStderr, false, \ 2475 "If DisplayVMOutput is true, display all VM output to stderr") \ 2476 \ 2477 product(bool, DisplayVMOutputToStdout, false, \ 2478 "If DisplayVMOutput is true, display all VM output to stdout") \ 2479 \ 2480 product(bool, UseHeavyMonitors, false, \ 2481 "use heavyweight instead of lightweight Java monitors") \ 2482 \ 2483 product(bool, PrintStringTableStatistics, false, \ 2484 "print statistics about the StringTable and SymbolTable") \ 2485 \ 2486 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2487 "print histogram of the symbol table") \ 2488 \ 2489 notproduct(bool, ExitVMOnVerifyError, false, \ 2490 "standard exit from VM if bytecode verify error " \ 2491 "(only in debug mode)") \ 2492 \ 2493 notproduct(ccstr, AbortVMOnException, NULL, \ 2494 "Call fatal if this exception is thrown. Example: " \ 2495 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2496 \ 2497 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2498 "Call fatal if the exception pointed by AbortVMOnException " \ 2499 "has this message.") \ 2500 \ 2501 develop(bool, DebugVtables, false, \ 2502 "add debugging code to vtable dispatch") \ 2503 \ 2504 develop(bool, PrintVtables, false, \ 2505 "print vtables when printing klass") \ 2506 \ 2507 notproduct(bool, PrintVtableStats, false, \ 2508 "print vtables stats at end of run") \ 2509 \ 2510 develop(bool, TraceCreateZombies, false, \ 2511 "trace creation of zombie nmethods") \ 2512 \ 2513 notproduct(bool, IgnoreLockingAssertions, false, \ 2514 "disable locking assertions (for speed)") \ 2515 \ 2516 product(bool, RangeCheckElimination, true, \ 2517 "Split loop iterations to eliminate range checks") \ 2518 \ 2519 develop_pd(bool, UncommonNullCast, \ 2520 "track occurrences of null in casts; adjust compiler tactics") \ 2521 \ 2522 develop(bool, TypeProfileCasts, true, \ 2523 "treat casts like calls for purposes of type profiling") \ 2524 \ 2525 develop(bool, DelayCompilationDuringStartup, true, \ 2526 "Delay invoking the compiler until main application class is " \ 2527 "loaded") \ 2528 \ 2529 develop(bool, CompileTheWorld, false, \ 2530 "Compile all methods in all classes in bootstrap class path " \ 2531 "(stress test)") \ 2532 \ 2533 develop(bool, CompileTheWorldPreloadClasses, true, \ 2534 "Preload all classes used by a class before start loading") \ 2535 \ 2536 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2537 "Force a safepoint every n compiles so sweeper can keep up") \ 2538 \ 2539 develop(bool, FillDelaySlots, true, \ 2540 "Fill delay slots (on SPARC only)") \ 2541 \ 2542 develop(bool, TimeLivenessAnalysis, false, \ 2543 "Time computation of bytecode liveness analysis") \ 2544 \ 2545 develop(bool, TraceLivenessGen, false, \ 2546 "Trace the generation of liveness analysis information") \ 2547 \ 2548 notproduct(bool, TraceLivenessQuery, false, \ 2549 "Trace queries of liveness analysis information") \ 2550 \ 2551 notproduct(bool, CollectIndexSetStatistics, false, \ 2552 "Collect information about IndexSets") \ 2553 \ 2554 develop(bool, UseLoopSafepoints, true, \ 2555 "Generate Safepoint nodes in every loop") \ 2556 \ 2557 develop(intx, FastAllocateSizeLimit, 128*K, \ 2558 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2559 "Inline allocations larger than this in doublewords must go slow")\ 2560 \ 2561 product(bool, AggressiveOpts, false, \ 2562 "Enable aggressive optimizations - see arguments.cpp") \ 2563 \ 2564 product(bool, UseStringCache, false, \ 2565 "Enable String cache capabilities on String.java") \ 2566 \ 2567 /* statistics */ \ 2568 develop(bool, CountCompiledCalls, false, \ 2569 "counts method invocations") \ 2570 \ 2571 notproduct(bool, CountRuntimeCalls, false, \ 2572 "counts VM runtime calls") \ 2573 \ 2574 develop(bool, CountJNICalls, false, \ 2575 "counts jni method invocations") \ 2576 \ 2577 notproduct(bool, CountJVMCalls, false, \ 2578 "counts jvm method invocations") \ 2579 \ 2580 notproduct(bool, CountRemovableExceptions, false, \ 2581 "count exceptions that could be replaced by branches due to " \ 2582 "inlining") \ 2583 \ 2584 notproduct(bool, ICMissHistogram, false, \ 2585 "produce histogram of IC misses") \ 2586 \ 2587 notproduct(bool, PrintClassStatistics, false, \ 2588 "prints class statistics at end of run") \ 2589 \ 2590 notproduct(bool, PrintMethodStatistics, false, \ 2591 "prints method statistics at end of run") \ 2592 \ 2593 /* interpreter */ \ 2594 develop(bool, ClearInterpreterLocals, false, \ 2595 "Always clear local variables of interpreter activations upon " \ 2596 "entry") \ 2597 \ 2598 product_pd(bool, RewriteBytecodes, \ 2599 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2600 \ 2601 product_pd(bool, RewriteFrequentPairs, \ 2602 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2603 \ 2604 diagnostic(bool, PrintInterpreter, false, \ 2605 "Prints the generated interpreter code") \ 2606 \ 2607 product(bool, UseInterpreter, true, \ 2608 "Use interpreter for non-compiled methods") \ 2609 \ 2610 develop(bool, UseFastSignatureHandlers, true, \ 2611 "Use fast signature handlers for native calls") \ 2612 \ 2613 product(bool, UseLoopCounter, true, \ 2614 "Increment invocation counter on backward branch") \ 2615 \ 2616 product(bool, UseFastEmptyMethods, true, \ 2617 "Use fast method entry code for empty methods") \ 2618 \ 2619 product(bool, UseFastAccessorMethods, true, \ 2620 "Use fast method entry code for accessor methods") \ 2621 \ 2622 product_pd(bool, UseOnStackReplacement, \ 2623 "Use on stack replacement, calls runtime if invoc. counter " \ 2624 "overflows in loop") \ 2625 \ 2626 notproduct(bool, TraceOnStackReplacement, false, \ 2627 "Trace on stack replacement") \ 2628 \ 2629 product_pd(bool, PreferInterpreterNativeStubs, \ 2630 "Use always interpreter stubs for native methods invoked via " \ 2631 "interpreter") \ 2632 \ 2633 develop(bool, CountBytecodes, false, \ 2634 "Count number of bytecodes executed") \ 2635 \ 2636 develop(bool, PrintBytecodeHistogram, false, \ 2637 "Print histogram of the executed bytecodes") \ 2638 \ 2639 develop(bool, PrintBytecodePairHistogram, false, \ 2640 "Print histogram of the executed bytecode pairs") \ 2641 \ 2642 diagnostic(bool, PrintSignatureHandlers, false, \ 2643 "Print code generated for native method signature handlers") \ 2644 \ 2645 develop(bool, VerifyOops, false, \ 2646 "Do plausibility checks for oops") \ 2647 \ 2648 develop(bool, CheckUnhandledOops, false, \ 2649 "Check for unhandled oops in VM code") \ 2650 \ 2651 develop(bool, VerifyJNIFields, trueInDebug, \ 2652 "Verify jfieldIDs for instance fields") \ 2653 \ 2654 notproduct(bool, VerifyJNIEnvThread, false, \ 2655 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2656 "from JNI") \ 2657 \ 2658 develop(bool, VerifyFPU, false, \ 2659 "Verify FPU state (check for NaN's, etc.)") \ 2660 \ 2661 develop(bool, VerifyThread, false, \ 2662 "Watch the thread register for corruption (SPARC only)") \ 2663 \ 2664 develop(bool, VerifyActivationFrameSize, false, \ 2665 "Verify that activation frame didn't become smaller than its " \ 2666 "minimal size") \ 2667 \ 2668 develop(bool, TraceFrequencyInlining, false, \ 2669 "Trace frequency based inlining") \ 2670 \ 2671 develop_pd(bool, InlineIntrinsics, \ 2672 "Inline intrinsics that can be statically resolved") \ 2673 \ 2674 product_pd(bool, ProfileInterpreter, \ 2675 "Profile at the bytecode level during interpretation") \ 2676 \ 2677 develop_pd(bool, ProfileTraps, \ 2678 "Profile deoptimization traps at the bytecode level") \ 2679 \ 2680 product(intx, ProfileMaturityPercentage, 20, \ 2681 "number of method invocations/branches (expressed as % of " \ 2682 "CompileThreshold) before using the method's profile") \ 2683 \ 2684 develop(bool, PrintMethodData, false, \ 2685 "Print the results of +ProfileInterpreter at end of run") \ 2686 \ 2687 develop(bool, VerifyDataPointer, trueInDebug, \ 2688 "Verify the method data pointer during interpreter profiling") \ 2689 \ 2690 develop(bool, VerifyCompiledCode, false, \ 2691 "Include miscellaneous runtime verifications in nmethod code; " \ 2692 "default off because it disturbs nmethod size heuristics") \ 2693 \ 2694 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2695 "Manually make GC thread crash then dump java stack trace; " \ 2696 "Test only") \ 2697 \ 2698 /* compilation */ \ 2699 product(bool, UseCompiler, true, \ 2700 "use compilation") \ 2701 \ 2702 develop(bool, TraceCompilationPolicy, false, \ 2703 "Trace compilation policy") \ 2704 \ 2705 develop(bool, TimeCompilationPolicy, false, \ 2706 "Time the compilation policy") \ 2707 \ 2708 product(bool, UseCounterDecay, true, \ 2709 "adjust recompilation counters") \ 2710 \ 2711 develop(intx, CounterHalfLifeTime, 30, \ 2712 "half-life time of invocation counters (in secs)") \ 2713 \ 2714 develop(intx, CounterDecayMinIntervalLength, 500, \ 2715 "Min. ms. between invocation of CounterDecay") \ 2716 \ 2717 product(bool, AlwaysCompileLoopMethods, false, \ 2718 "when using recompilation, never interpret methods " \ 2719 "containing loops") \ 2720 \ 2721 product(bool, DontCompileHugeMethods, true, \ 2722 "don't compile methods > HugeMethodLimit") \ 2723 \ 2724 /* Bytecode escape analysis estimation. */ \ 2725 product(bool, EstimateArgEscape, true, \ 2726 "Analyze bytecodes to estimate escape state of arguments") \ 2727 \ 2728 product(intx, BCEATraceLevel, 0, \ 2729 "How much tracing to do of bytecode escape analysis estimates") \ 2730 \ 2731 product(intx, MaxBCEAEstimateLevel, 5, \ 2732 "Maximum number of nested calls that are analyzed by BC EA.") \ 2733 \ 2734 product(intx, MaxBCEAEstimateSize, 150, \ 2735 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2736 \ 2737 product(intx, AllocatePrefetchStyle, 1, \ 2738 "0 = no prefetch, " \ 2739 "1 = prefetch instructions for each allocation, " \ 2740 "2 = use TLAB watermark to gate allocation prefetch, " \ 2741 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2742 \ 2743 product(intx, AllocatePrefetchDistance, -1, \ 2744 "Distance to prefetch ahead of allocation pointer") \ 2745 \ 2746 product(intx, AllocatePrefetchLines, 3, \ 2747 "Number of lines to prefetch ahead of array allocation pointer") \ 2748 \ 2749 product(intx, AllocateInstancePrefetchLines, 1, \ 2750 "Number of lines to prefetch ahead of instance allocation pointer") \ 2751 \ 2752 product(intx, AllocatePrefetchStepSize, 16, \ 2753 "Step size in bytes of sequential prefetch instructions") \ 2754 \ 2755 product(intx, AllocatePrefetchInstr, 0, \ 2756 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2757 \ 2758 /* deoptimization */ \ 2759 develop(bool, TraceDeoptimization, false, \ 2760 "Trace deoptimization") \ 2761 \ 2762 develop(bool, DebugDeoptimization, false, \ 2763 "Tracing various information while debugging deoptimization") \ 2764 \ 2765 product(intx, SelfDestructTimer, 0, \ 2766 "Will cause VM to terminate after a given time (in minutes) " \ 2767 "(0 means off)") \ 2768 \ 2769 product(intx, MaxJavaStackTraceDepth, 1024, \ 2770 "Max. no. of lines in the stack trace for Java exceptions " \ 2771 "(0 means all)") \ 2772 \ 2773 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2774 "Guarantee a safepoint (at least) every so many milliseconds " \ 2775 "(0 means none)")) \ 2776 \ 2777 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2778 "Guarantee a safepoint (at least) every so many milliseconds " \ 2779 "(0 means none)")) \ 2780 \ 2781 product(intx, SafepointTimeoutDelay, 10000, \ 2782 "Delay in milliseconds for option SafepointTimeout") \ 2783 \ 2784 product(intx, NmethodSweepFraction, 16, \ 2785 "Number of invocations of sweeper to cover all nmethods") \ 2786 \ 2787 product(intx, NmethodSweepCheckInterval, 5, \ 2788 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2789 \ 2790 notproduct(bool, LogSweeper, false, \ 2791 "Keep a ring buffer of sweeper activity") \ 2792 \ 2793 notproduct(intx, SweeperLogEntries, 1024, \ 2794 "Number of records in the ring buffer of sweeper activity") \ 2795 \ 2796 notproduct(intx, MemProfilingInterval, 500, \ 2797 "Time between each invocation of the MemProfiler") \ 2798 \ 2799 develop(intx, MallocCatchPtr, -1, \ 2800 "Hit breakpoint when mallocing/freeing this pointer") \ 2801 \ 2802 notproduct(intx, AssertRepeat, 1, \ 2803 "number of times to evaluate expression in assert " \ 2804 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2805 \ 2806 notproduct(ccstrlist, SuppressErrorAt, "", \ 2807 "List of assertions (file:line) to muzzle") \ 2808 \ 2809 notproduct(uintx, HandleAllocationLimit, 1024, \ 2810 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2811 "is used") \ 2812 \ 2813 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2814 "Threshold for total handle allocation when " \ 2815 "+TraceHandleAllocation is used") \ 2816 \ 2817 develop(intx, StackPrintLimit, 100, \ 2818 "number of stack frames to print in VM-level stack dump") \ 2819 \ 2820 notproduct(intx, MaxElementPrintSize, 256, \ 2821 "maximum number of elements to print") \ 2822 \ 2823 notproduct(intx, MaxSubklassPrintSize, 4, \ 2824 "maximum number of subklasses to print when printing klass") \ 2825 \ 2826 product(intx, MaxInlineLevel, 9, \ 2827 "maximum number of nested calls that are inlined") \ 2828 \ 2829 product(intx, MaxRecursiveInlineLevel, 1, \ 2830 "maximum number of nested recursive calls that are inlined") \ 2831 \ 2832 product_pd(intx, InlineSmallCode, \ 2833 "Only inline already compiled methods if their code size is " \ 2834 "less than this") \ 2835 \ 2836 product(intx, MaxInlineSize, 35, \ 2837 "maximum bytecode size of a method to be inlined") \ 2838 \ 2839 product_pd(intx, FreqInlineSize, \ 2840 "maximum bytecode size of a frequent method to be inlined") \ 2841 \ 2842 product(intx, MaxTrivialSize, 6, \ 2843 "maximum bytecode size of a trivial method to be inlined") \ 2844 \ 2845 product(intx, MinInliningThreshold, 250, \ 2846 "min. invocation count a method needs to have to be inlined") \ 2847 \ 2848 develop(intx, MethodHistogramCutoff, 100, \ 2849 "cutoff value for method invoc. histogram (+CountCalls)") \ 2850 \ 2851 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2852 "# of interpreted methods to show in profile") \ 2853 \ 2854 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2855 "# of compiled methods to show in profile") \ 2856 \ 2857 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2858 "# of stub methods to show in profile") \ 2859 \ 2860 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2861 "# of runtime stub nodes to show in profile") \ 2862 \ 2863 product(intx, ProfileIntervalsTicks, 100, \ 2864 "# of ticks between printing of interval profile " \ 2865 "(+ProfileIntervals)") \ 2866 \ 2867 notproduct(intx, ScavengeALotInterval, 1, \ 2868 "Interval between which scavenge will occur with +ScavengeALot") \ 2869 \ 2870 notproduct(intx, FullGCALotInterval, 1, \ 2871 "Interval between which full gc will occur with +FullGCALot") \ 2872 \ 2873 notproduct(intx, FullGCALotStart, 0, \ 2874 "For which invocation to start FullGCAlot") \ 2875 \ 2876 notproduct(intx, FullGCALotDummies, 32*K, \ 2877 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2878 "to move") \ 2879 \ 2880 develop(intx, DontYieldALotInterval, 10, \ 2881 "Interval between which yields will be dropped (milliseconds)") \ 2882 \ 2883 develop(intx, MinSleepInterval, 1, \ 2884 "Minimum sleep() interval (milliseconds) when " \ 2885 "ConvertSleepToYield is off (used for SOLARIS)") \ 2886 \ 2887 develop(intx, ProfilerPCTickThreshold, 15, \ 2888 "Number of ticks in a PC buckets to be a hotspot") \ 2889 \ 2890 notproduct(intx, DeoptimizeALotInterval, 5, \ 2891 "Number of exits until DeoptimizeALot kicks in") \ 2892 \ 2893 notproduct(intx, ZombieALotInterval, 5, \ 2894 "Number of exits until ZombieALot kicks in") \ 2895 \ 2896 develop(bool, StressNonEntrant, false, \ 2897 "Mark nmethods non-entrant at registration") \ 2898 \ 2899 diagnostic(intx, MallocVerifyInterval, 0, \ 2900 "if non-zero, verify C heap after every N calls to " \ 2901 "malloc/realloc/free") \ 2902 \ 2903 diagnostic(intx, MallocVerifyStart, 0, \ 2904 "if non-zero, start verifying C heap after Nth call to " \ 2905 "malloc/realloc/free") \ 2906 \ 2907 product(intx, TypeProfileWidth, 2, \ 2908 "number of receiver types to record in call/cast profile") \ 2909 \ 2910 develop(intx, BciProfileWidth, 2, \ 2911 "number of return bci's to record in ret profile") \ 2912 \ 2913 product(intx, PerMethodRecompilationCutoff, 400, \ 2914 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2915 \ 2916 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2917 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2918 \ 2919 product(intx, PerMethodTrapLimit, 100, \ 2920 "Limit on traps (of one kind) in a method (includes inlines)") \ 2921 \ 2922 product(intx, PerBytecodeTrapLimit, 4, \ 2923 "Limit on traps (of one kind) at a particular BCI") \ 2924 \ 2925 develop(intx, InlineFrequencyRatio, 20, \ 2926 "Ratio of call site execution to caller method invocation") \ 2927 \ 2928 develop_pd(intx, InlineFrequencyCount, \ 2929 "Count of call site execution necessary to trigger frequent " \ 2930 "inlining") \ 2931 \ 2932 develop(intx, InlineThrowCount, 50, \ 2933 "Force inlining of interpreted methods that throw this often") \ 2934 \ 2935 develop(intx, InlineThrowMaxSize, 200, \ 2936 "Force inlining of throwing methods smaller than this") \ 2937 \ 2938 develop(intx, ProfilerNodeSize, 1024, \ 2939 "Size in K to allocate for the Profile Nodes of each thread") \ 2940 \ 2941 product_pd(intx, PreInflateSpin, \ 2942 "Number of times to spin wait before inflation") \ 2943 \ 2944 /* gc parameters */ \ 2945 product(uintx, InitialHeapSize, 0, \ 2946 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2947 \ 2948 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2949 "Maximum heap size (in bytes)") \ 2950 \ 2951 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2952 "Initial tenured generation size (in bytes)") \ 2953 \ 2954 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2955 "Initial new generation size (in bytes)") \ 2956 \ 2957 product(uintx, MaxNewSize, max_uintx, \ 2958 "Maximum new generation size (in bytes), max_uintx means set " \ 2959 "ergonomically") \ 2960 \ 2961 product(uintx, PretenureSizeThreshold, 0, \ 2962 "Maximum size in bytes of objects allocated in DefNew " \ 2963 "generation; zero means no maximum") \ 2964 \ 2965 product(uintx, TLABSize, 0, \ 2966 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2967 \ 2968 product(uintx, MinTLABSize, 2*K, \ 2969 "Minimum allowed TLAB size (in bytes)") \ 2970 \ 2971 product(uintx, TLABAllocationWeight, 35, \ 2972 "Allocation averaging weight") \ 2973 \ 2974 product(uintx, TLABWasteTargetPercent, 1, \ 2975 "Percentage of Eden that can be wasted") \ 2976 \ 2977 product(uintx, TLABRefillWasteFraction, 64, \ 2978 "Max TLAB waste at a refill (internal fragmentation)") \ 2979 \ 2980 product(uintx, TLABWasteIncrement, 4, \ 2981 "Increment allowed waste at slow allocation") \ 2982 \ 2983 product(intx, SurvivorRatio, 8, \ 2984 "Ratio of eden/survivor space size") \ 2985 \ 2986 product(intx, NewRatio, 2, \ 2987 "Ratio of new/old generation sizes") \ 2988 \ 2989 product_pd(uintx, NewSizeThreadIncrease, \ 2990 "Additional size added to desired new generation size per " \ 2991 "non-daemon thread (in bytes)") \ 2992 \ 2993 product_pd(uintx, MetaspaceSize, \ 2994 "Initial size of Metaspaces (in bytes)") \ 2995 \ 2996 product(uintx, MaxMetaspaceSize, max_uintx, \ 2997 "Maximum size of Metaspaces (in bytes)") \ 2998 \ 2999 product(uintx, ClassMetaspaceSize, 2*M, \ 3000 "Maximum size of InstanceKlass area in Metaspace used for " \ 3001 "UseCompressedKlassPointers") \ 3002 \ 3003 product(uintx, MinHeapFreeRatio, 40, \ 3004 "Min percentage of heap free after GC to avoid expansion") \ 3005 \ 3006 product(uintx, MaxHeapFreeRatio, 70, \ 3007 "Max percentage of heap free after GC to avoid shrinking") \ 3008 \ 3009 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3010 "Number of milliseconds per MB of free space in the heap") \ 3011 \ 3012 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3013 "Min change in heap space due to GC (in bytes)") \ 3014 \ 3015 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3016 "Min expansion of permanent heap (in bytes)") \ 3017 \ 3018 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3019 "Max expansion of permanent heap without full GC (in bytes)") \ 3020 \ 3021 product(intx, QueuedAllocationWarningCount, 0, \ 3022 "Number of times an allocation that queues behind a GC " \ 3023 "will retry before printing a warning") \ 3024 \ 3025 diagnostic(uintx, VerifyGCStartAt, 0, \ 3026 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3027 \ 3028 diagnostic(intx, VerifyGCLevel, 0, \ 3029 "Generation level at which to start +VerifyBefore/AfterGC") \ 3030 \ 3031 product(uintx, MaxTenuringThreshold, 15, \ 3032 "Maximum value for tenuring threshold") \ 3033 \ 3034 product(uintx, InitialTenuringThreshold, 7, \ 3035 "Initial value for tenuring threshold") \ 3036 \ 3037 product(intx, TargetSurvivorRatio, 50, \ 3038 "Desired percentage of survivor space used after scavenge") \ 3039 \ 3040 product(uintx, MarkSweepDeadRatio, 5, \ 3041 "Percentage (0-100) of the old gen allowed as dead wood." \ 3042 "Serial mark sweep treats this as both the min and max value." \ 3043 "CMS uses this value only if it falls back to mark sweep." \ 3044 "Par compact uses a variable scale based on the density of the" \ 3045 "generation and treats this as the max value when the heap is" \ 3046 "either completely full or completely empty. Par compact also" \ 3047 "has a smaller default value; see arguments.cpp.") \ 3048 \ 3049 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3050 "How often should we fully compact the heap (ignoring the dead " \ 3051 "space parameters)") \ 3052 \ 3053 product(intx, PrintCMSStatistics, 0, \ 3054 "Statistics for CMS") \ 3055 \ 3056 product(bool, PrintCMSInitiationStatistics, false, \ 3057 "Statistics for initiating a CMS collection") \ 3058 \ 3059 product(intx, PrintFLSStatistics, 0, \ 3060 "Statistics for CMS' FreeListSpace") \ 3061 \ 3062 product(intx, PrintFLSCensus, 0, \ 3063 "Census for CMS' FreeListSpace") \ 3064 \ 3065 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3066 "Delay in ms between expansion and allocation") \ 3067 \ 3068 develop(uintx, GCWorkerDelayMillis, 0, \ 3069 "Delay in ms in scheduling GC workers") \ 3070 \ 3071 product(intx, DeferThrSuspendLoopCount, 4000, \ 3072 "(Unstable) Number of times to iterate in safepoint loop " \ 3073 " before blocking VM threads ") \ 3074 \ 3075 product(intx, DeferPollingPageLoopCount, -1, \ 3076 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3077 "before changing safepoint polling page to RO ") \ 3078 \ 3079 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3080 \ 3081 product(bool, PSChunkLargeArrays, true, \ 3082 "true: process large arrays in chunks") \ 3083 \ 3084 product(uintx, GCDrainStackTargetSize, 64, \ 3085 "how many entries we'll try to leave on the stack during " \ 3086 "parallel GC") \ 3087 \ 3088 /* stack parameters */ \ 3089 product_pd(intx, StackYellowPages, \ 3090 "Number of yellow zone (recoverable overflows) pages") \ 3091 \ 3092 product_pd(intx, StackRedPages, \ 3093 "Number of red zone (unrecoverable overflows) pages") \ 3094 \ 3095 product_pd(intx, StackShadowPages, \ 3096 "Number of shadow zone (for overflow checking) pages" \ 3097 " this should exceed the depth of the VM and native call stack") \ 3098 \ 3099 product_pd(intx, ThreadStackSize, \ 3100 "Thread Stack Size (in Kbytes)") \ 3101 \ 3102 product_pd(intx, VMThreadStackSize, \ 3103 "Non-Java Thread Stack Size (in Kbytes)") \ 3104 \ 3105 product_pd(intx, CompilerThreadStackSize, \ 3106 "Compiler Thread Stack Size (in Kbytes)") \ 3107 \ 3108 develop_pd(uintx, JVMInvokeMethodSlack, \ 3109 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3110 \ 3111 product(uintx, ThreadSafetyMargin, 50*M, \ 3112 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3113 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3114 "disable this feature") \ 3115 \ 3116 /* code cache parameters */ \ 3117 develop(uintx, CodeCacheSegmentSize, 64, \ 3118 "Code cache segment size (in bytes) - smallest unit of " \ 3119 "allocation") \ 3120 \ 3121 develop_pd(intx, CodeEntryAlignment, \ 3122 "Code entry alignment for generated code (in bytes)") \ 3123 \ 3124 product_pd(intx, OptoLoopAlignment, \ 3125 "Align inner loops to zero relative to this modulus") \ 3126 \ 3127 product_pd(uintx, InitialCodeCacheSize, \ 3128 "Initial code cache size (in bytes)") \ 3129 \ 3130 product_pd(uintx, ReservedCodeCacheSize, \ 3131 "Reserved code cache size (in bytes) - maximum code cache size") \ 3132 \ 3133 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3134 "When less than X space left, we stop compiling.") \ 3135 \ 3136 product_pd(uintx, CodeCacheExpansionSize, \ 3137 "Code cache expansion size (in bytes)") \ 3138 \ 3139 develop_pd(uintx, CodeCacheMinBlockLength, \ 3140 "Minimum number of segments in a code cache block.") \ 3141 \ 3142 notproduct(bool, ExitOnFullCodeCache, false, \ 3143 "Exit the VM if we fill the code cache.") \ 3144 \ 3145 product(bool, UseCodeCacheFlushing, true, \ 3146 "Attempt to clean the code cache before shutting off compiler") \ 3147 \ 3148 product(intx, MinCodeCacheFlushingInterval, 30, \ 3149 "Min number of seconds between code cache cleaning sessions") \ 3150 \ 3151 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3152 "When less than X space left, start code cache cleaning") \ 3153 \ 3154 /* interpreter debugging */ \ 3155 develop(intx, BinarySwitchThreshold, 5, \ 3156 "Minimal number of lookupswitch entries for rewriting to binary " \ 3157 "switch") \ 3158 \ 3159 develop(intx, StopInterpreterAt, 0, \ 3160 "Stops interpreter execution at specified bytecode number") \ 3161 \ 3162 develop(intx, TraceBytecodesAt, 0, \ 3163 "Traces bytecodes starting with specified bytecode number") \ 3164 \ 3165 /* compiler interface */ \ 3166 develop(intx, CIStart, 0, \ 3167 "the id of the first compilation to permit") \ 3168 \ 3169 develop(intx, CIStop, -1, \ 3170 "the id of the last compilation to permit") \ 3171 \ 3172 develop(intx, CIStartOSR, 0, \ 3173 "the id of the first osr compilation to permit " \ 3174 "(CICountOSR must be on)") \ 3175 \ 3176 develop(intx, CIStopOSR, -1, \ 3177 "the id of the last osr compilation to permit " \ 3178 "(CICountOSR must be on)") \ 3179 \ 3180 develop(intx, CIBreakAtOSR, -1, \ 3181 "id of osr compilation to break at") \ 3182 \ 3183 develop(intx, CIBreakAt, -1, \ 3184 "id of compilation to break at") \ 3185 \ 3186 product(ccstrlist, CompileOnly, "", \ 3187 "List of methods (pkg/class.name) to restrict compilation to") \ 3188 \ 3189 product(ccstr, CompileCommandFile, NULL, \ 3190 "Read compiler commands from this file [.hotspot_compiler]") \ 3191 \ 3192 product(ccstrlist, CompileCommand, "", \ 3193 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3194 \ 3195 product(bool, CICompilerCountPerCPU, false, \ 3196 "1 compiler thread for log(N CPUs)") \ 3197 \ 3198 develop(intx, CIFireOOMAt, -1, \ 3199 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3200 "(non-negative value throws OOM after this many CI accesses " \ 3201 "in each compile)") \ 3202 \ 3203 notproduct(bool, CIObjectFactoryVerify, false, \ 3204 "enable potentially expensive verification in ciObjectFactory") \ 3205 \ 3206 /* Priorities */ \ 3207 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3208 \ 3209 product(intx, ThreadPriorityPolicy, 0, \ 3210 "0 : Normal. "\ 3211 " VM chooses priorities that are appropriate for normal "\ 3212 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3213 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3214 " map to lower native priority values. On Windows applications"\ 3215 " are allowed to use higher native priorities. However, with "\ 3216 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3217 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3218 " interfere with system threads. On Linux thread priorities "\ 3219 " are ignored because the OS does not support static priority "\ 3220 " in SCHED_OTHER scheduling class which is the only choice for"\ 3221 " non-root, non-realtime applications. "\ 3222 "1 : Aggressive. "\ 3223 " Java thread priorities map over to the entire range of "\ 3224 " native thread priorities. Higher Java thread priorities map "\ 3225 " to higher native thread priorities. This policy should be "\ 3226 " used with care, as sometimes it can cause performance "\ 3227 " degradation in the application and/or the entire system. On "\ 3228 " Linux this policy requires root privilege.") \ 3229 \ 3230 product(bool, ThreadPriorityVerbose, false, \ 3231 "Print priority changes") \ 3232 \ 3233 product(intx, DefaultThreadPriority, -1, \ 3234 "The native priority at which threads run if not elsewhere " \ 3235 "specified (-1 means no change)") \ 3236 \ 3237 product(intx, CompilerThreadPriority, -1, \ 3238 "The native priority at which compiler threads should run " \ 3239 "(-1 means no change)") \ 3240 \ 3241 product(intx, VMThreadPriority, -1, \ 3242 "The native priority at which the VM thread should run " \ 3243 "(-1 means no change)") \ 3244 \ 3245 product(bool, CompilerThreadHintNoPreempt, true, \ 3246 "(Solaris only) Give compiler threads an extra quanta") \ 3247 \ 3248 product(bool, VMThreadHintNoPreempt, false, \ 3249 "(Solaris only) Give VM thread an extra quanta") \ 3250 \ 3251 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3252 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3253 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3254 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3255 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3256 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3257 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3258 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3259 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3260 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3261 \ 3262 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3263 "Java thread priority 10 maps to critical scheduling priority") \ 3264 \ 3265 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3266 "Compiler thread(s) run at critical scheduling priority") \ 3267 \ 3268 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3269 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3270 \ 3271 /* compiler debugging */ \ 3272 notproduct(intx, CompileTheWorldStartAt, 1, \ 3273 "First class to consider when using +CompileTheWorld") \ 3274 \ 3275 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3276 "Last class to consider when using +CompileTheWorld") \ 3277 \ 3278 develop(intx, NewCodeParameter, 0, \ 3279 "Testing Only: Create a dedicated integer parameter before " \ 3280 "putback") \ 3281 \ 3282 /* new oopmap storage allocation */ \ 3283 develop(intx, MinOopMapAllocation, 8, \ 3284 "Minimum number of OopMap entries in an OopMapSet") \ 3285 \ 3286 /* Background Compilation */ \ 3287 develop(intx, LongCompileThreshold, 50, \ 3288 "Used with +TraceLongCompiles") \ 3289 \ 3290 product(intx, StarvationMonitorInterval, 200, \ 3291 "Pause between each check in ms") \ 3292 \ 3293 /* recompilation */ \ 3294 product_pd(intx, CompileThreshold, \ 3295 "number of interpreted method invocations before (re-)compiling") \ 3296 \ 3297 product_pd(intx, BackEdgeThreshold, \ 3298 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3299 \ 3300 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3301 "Interpreter (tier 0) invocation notification frequency.") \ 3302 \ 3303 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3304 "C1 without MDO (tier 2) invocation notification frequency.") \ 3305 \ 3306 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3307 "C1 with MDO profiling (tier 3) invocation notification " \ 3308 "frequency.") \ 3309 \ 3310 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3311 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3312 \ 3313 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3314 "Interpreter (tier 0) invocation notification frequency.") \ 3315 \ 3316 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3317 "C1 without MDO (tier 2) invocation notification frequency.") \ 3318 \ 3319 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3320 "C1 with MDO profiling (tier 3) invocation notification " \ 3321 "frequency.") \ 3322 \ 3323 product(intx, Tier2CompileThreshold, 0, \ 3324 "threshold at which tier 2 compilation is invoked") \ 3325 \ 3326 product(intx, Tier2BackEdgeThreshold, 0, \ 3327 "Back edge threshold at which tier 2 compilation is invoked") \ 3328 \ 3329 product(intx, Tier3InvocationThreshold, 200, \ 3330 "Compile if number of method invocations crosses this " \ 3331 "threshold") \ 3332 \ 3333 product(intx, Tier3MinInvocationThreshold, 100, \ 3334 "Minimum invocation to compile at tier 3") \ 3335 \ 3336 product(intx, Tier3CompileThreshold, 2000, \ 3337 "Threshold at which tier 3 compilation is invoked (invocation " \ 3338 "minimum must be satisfied.") \ 3339 \ 3340 product(intx, Tier3BackEdgeThreshold, 60000, \ 3341 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3342 \ 3343 product(intx, Tier4InvocationThreshold, 5000, \ 3344 "Compile if number of method invocations crosses this " \ 3345 "threshold") \ 3346 \ 3347 product(intx, Tier4MinInvocationThreshold, 600, \ 3348 "Minimum invocation to compile at tier 4") \ 3349 \ 3350 product(intx, Tier4CompileThreshold, 15000, \ 3351 "Threshold at which tier 4 compilation is invoked (invocation " \ 3352 "minimum must be satisfied.") \ 3353 \ 3354 product(intx, Tier4BackEdgeThreshold, 40000, \ 3355 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3356 \ 3357 product(intx, Tier3DelayOn, 5, \ 3358 "If C2 queue size grows over this amount per compiler thread " \ 3359 "stop compiling at tier 3 and start compiling at tier 2") \ 3360 \ 3361 product(intx, Tier3DelayOff, 2, \ 3362 "If C2 queue size is less than this amount per compiler thread " \ 3363 "allow methods compiled at tier 2 transition to tier 3") \ 3364 \ 3365 product(intx, Tier3LoadFeedback, 5, \ 3366 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3367 "reaches this amount per compiler thread") \ 3368 \ 3369 product(intx, Tier4LoadFeedback, 3, \ 3370 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3371 "reaches this amount per compiler thread") \ 3372 \ 3373 product(intx, TieredCompileTaskTimeout, 50, \ 3374 "Kill compile task if method was not used within " \ 3375 "given timeout in milliseconds") \ 3376 \ 3377 product(intx, TieredStopAtLevel, 4, \ 3378 "Stop at given compilation level") \ 3379 \ 3380 product(intx, Tier0ProfilingStartPercentage, 200, \ 3381 "Start profiling in interpreter if the counters exceed tier 3" \ 3382 "thresholds by the specified percentage") \ 3383 \ 3384 product(intx, TieredRateUpdateMinTime, 1, \ 3385 "Minimum rate sampling interval (in milliseconds)") \ 3386 \ 3387 product(intx, TieredRateUpdateMaxTime, 25, \ 3388 "Maximum rate sampling interval (in milliseconds)") \ 3389 \ 3390 product_pd(bool, TieredCompilation, \ 3391 "Enable tiered compilation") \ 3392 \ 3393 product(bool, PrintTieredEvents, false, \ 3394 "Print tiered events notifications") \ 3395 \ 3396 product_pd(intx, OnStackReplacePercentage, \ 3397 "NON_TIERED number of method invocations/branches (expressed as %"\ 3398 "of CompileThreshold) before (re-)compiling OSR code") \ 3399 \ 3400 product(intx, InterpreterProfilePercentage, 33, \ 3401 "NON_TIERED number of method invocations/branches (expressed as %"\ 3402 "of CompileThreshold) before profiling in the interpreter") \ 3403 \ 3404 develop(intx, MaxRecompilationSearchLength, 10, \ 3405 "max. # frames to inspect searching for recompilee") \ 3406 \ 3407 develop(intx, MaxInterpretedSearchLength, 3, \ 3408 "max. # interp. frames to skip when searching for recompilee") \ 3409 \ 3410 develop(intx, DesiredMethodLimit, 8000, \ 3411 "desired max. method size (in bytecodes) after inlining") \ 3412 \ 3413 develop(intx, HugeMethodLimit, 8000, \ 3414 "don't compile methods larger than this if " \ 3415 "+DontCompileHugeMethods") \ 3416 \ 3417 /* New JDK 1.4 reflection implementation */ \ 3418 \ 3419 develop(bool, UseNewReflection, true, \ 3420 "Temporary flag for transition to reflection based on dynamic " \ 3421 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3422 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3423 "changes were needed") \ 3424 \ 3425 develop(bool, VerifyReflectionBytecodes, false, \ 3426 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3427 "in situations like that described in 4486457 or for " \ 3428 "constructors generated for serialization, so can not be enabled "\ 3429 "in product.") \ 3430 \ 3431 product(bool, ReflectionWrapResolutionErrors, true, \ 3432 "Temporary flag for transition to AbstractMethodError wrapped " \ 3433 "in InvocationTargetException. See 6531596") \ 3434 \ 3435 \ 3436 develop(intx, FastSuperclassLimit, 8, \ 3437 "Depth of hardwired instanceof accelerator array") \ 3438 \ 3439 /* Properties for Java libraries */ \ 3440 \ 3441 product(uintx, MaxDirectMemorySize, 0, \ 3442 "Maximum total size of NIO direct-buffer allocations") \ 3443 \ 3444 /* temporary developer defined flags */ \ 3445 \ 3446 diagnostic(bool, UseNewCode, false, \ 3447 "Testing Only: Use the new version while testing") \ 3448 \ 3449 diagnostic(bool, UseNewCode2, false, \ 3450 "Testing Only: Use the new version while testing") \ 3451 \ 3452 diagnostic(bool, UseNewCode3, false, \ 3453 "Testing Only: Use the new version while testing") \ 3454 \ 3455 /* flags for performance data collection */ \ 3456 \ 3457 product(bool, UsePerfData, falseInEmbedded, \ 3458 "Flag to disable jvmstat instrumentation for performance testing" \ 3459 "and problem isolation purposes.") \ 3460 \ 3461 product(bool, PerfDataSaveToFile, false, \ 3462 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3463 \ 3464 product(ccstr, PerfDataSaveFile, NULL, \ 3465 "Save PerfData memory to the specified absolute pathname," \ 3466 "%p in the file name if present will be replaced by pid") \ 3467 \ 3468 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3469 "Data sampling interval in milliseconds") \ 3470 \ 3471 develop(bool, PerfTraceDataCreation, false, \ 3472 "Trace creation of Performance Data Entries") \ 3473 \ 3474 develop(bool, PerfTraceMemOps, false, \ 3475 "Trace PerfMemory create/attach/detach calls") \ 3476 \ 3477 product(bool, PerfDisableSharedMem, false, \ 3478 "Store performance data in standard memory") \ 3479 \ 3480 product(intx, PerfDataMemorySize, 32*K, \ 3481 "Size of performance data memory region. Will be rounded " \ 3482 "up to a multiple of the native os page size.") \ 3483 \ 3484 product(intx, PerfMaxStringConstLength, 1024, \ 3485 "Maximum PerfStringConstant string length before truncation") \ 3486 \ 3487 product(bool, PerfAllowAtExitRegistration, false, \ 3488 "Allow registration of atexit() methods") \ 3489 \ 3490 product(bool, PerfBypassFileSystemCheck, false, \ 3491 "Bypass Win32 file system criteria checks (Windows Only)") \ 3492 \ 3493 product(intx, UnguardOnExecutionViolation, 0, \ 3494 "Unguard page and retry on no-execute fault (Win32 only)" \ 3495 "0=off, 1=conservative, 2=aggressive") \ 3496 \ 3497 /* Serviceability Support */ \ 3498 \ 3499 product(bool, ManagementServer, false, \ 3500 "Create JMX Management Server") \ 3501 \ 3502 product(bool, DisableAttachMechanism, false, \ 3503 "Disable mechanism that allows tools to attach to this VM") \ 3504 \ 3505 product(bool, StartAttachListener, false, \ 3506 "Always start Attach Listener at VM startup") \ 3507 \ 3508 manageable(bool, PrintConcurrentLocks, false, \ 3509 "Print java.util.concurrent locks in thread dump") \ 3510 \ 3511 product(bool, TransmitErrorReport, false, \ 3512 "Enable error report transmission on erroneous termination") \ 3513 \ 3514 product(ccstr, ErrorReportServer, NULL, \ 3515 "Override built-in error report server address") \ 3516 \ 3517 /* Shared spaces */ \ 3518 \ 3519 product(bool, UseSharedSpaces, true, \ 3520 "Use shared spaces in the permanent generation") \ 3521 \ 3522 product(bool, RequireSharedSpaces, false, \ 3523 "Require shared spaces in the permanent generation") \ 3524 \ 3525 product(bool, DumpSharedSpaces, false, \ 3526 "Special mode: JVM reads a class list, loads classes, builds " \ 3527 "shared spaces, and dumps the shared spaces to a file to be " \ 3528 "used in future JVM runs.") \ 3529 \ 3530 product(bool, PrintSharedSpaces, false, \ 3531 "Print usage of shared spaces") \ 3532 \ 3533 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3534 "Size of read-write space in permanent generation (in bytes)") \ 3535 \ 3536 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3537 "Size of read-only space in permanent generation (in bytes)") \ 3538 \ 3539 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3540 "Size of the shared data area adjacent to the heap (in bytes)") \ 3541 \ 3542 product(uintx, SharedMiscCodeSize, 120*K, \ 3543 "Size of the shared code area adjacent to the heap (in bytes)") \ 3544 \ 3545 product(uintx, SharedDummyBlockSize, 0, \ 3546 "Size of dummy block used to shift heap addresses (in bytes)") \ 3547 \ 3548 diagnostic(bool, SharedSkipVerify, false, \ 3549 "Skip assert() and verify() which page-in unwanted shared " \ 3550 "objects. ") \ 3551 \ 3552 diagnostic(bool, EnableInvokeDynamic, true, \ 3553 "support JSR 292 (method handles, invokedynamic, " \ 3554 "anonymous classes") \ 3555 \ 3556 diagnostic(bool, PrintMethodHandleStubs, false, \ 3557 "Print generated stub code for method handles") \ 3558 \ 3559 develop(bool, TraceMethodHandles, false, \ 3560 "trace internal method handle operations") \ 3561 \ 3562 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3563 "perform extra checks when constructing method handles") \ 3564 \ 3565 diagnostic(bool, ShowHiddenFrames, false, \ 3566 "show method handle implementation frames (usually hidden)") \ 3567 \ 3568 experimental(bool, TrustFinalNonStaticFields, false, \ 3569 "trust final non-static declarations for constant folding") \ 3570 \ 3571 develop(bool, TraceInvokeDynamic, false, \ 3572 "trace internal invoke dynamic operations") \ 3573 \ 3574 diagnostic(bool, PauseAtStartup, false, \ 3575 "Causes the VM to pause at startup time and wait for the pause " \ 3576 "file to be removed (default: ./vm.paused.<pid>)") \ 3577 \ 3578 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3579 "The file to create and for whose removal to await when pausing " \ 3580 "at startup. (default: ./vm.paused.<pid>)") \ 3581 \ 3582 diagnostic(bool, PauseAtExit, false, \ 3583 "Pause and wait for keypress on exit if a debugger is attached") \ 3584 \ 3585 product(bool, ExtendedDTraceProbes, false, \ 3586 "Enable performance-impacting dtrace probes") \ 3587 \ 3588 product(bool, DTraceMethodProbes, false, \ 3589 "Enable dtrace probes for method-entry and method-exit") \ 3590 \ 3591 product(bool, DTraceAllocProbes, false, \ 3592 "Enable dtrace probes for object allocation") \ 3593 \ 3594 product(bool, DTraceMonitorProbes, false, \ 3595 "Enable dtrace probes for monitor events") \ 3596 \ 3597 product(bool, RelaxAccessControlCheck, false, \ 3598 "Relax the access control checks in the verifier") \ 3599 \ 3600 diagnostic(bool, PrintDTraceDOF, false, \ 3601 "Print the DTrace DOF passed to the system for JSDT probes") \ 3602 \ 3603 product(uintx, StringTableSize, 1009, \ 3604 "Number of buckets in the interned String table") \ 3605 \ 3606 product(bool, UseVMInterruptibleIO, false, \ 3607 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3608 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3609 " of this flag is true for JDK 6 and earlier") \ 3610 \ 3611 diagnostic(bool, WhiteBoxAPI, false, \ 3612 "Enable internal testing APIs") \ 3613 \ 3614 product(bool, PrintGCCause, true, \ 3615 "Include GC cause in GC logging") 3616 3617/* 3618 * Macros for factoring of globals 3619 */ 3620 3621// Interface macros 3622#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3623#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3624#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3625#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3626#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3627#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3628#ifdef PRODUCT 3629#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3630#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3631#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3632#else 3633#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3634#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3635#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3636#endif 3637// Special LP64 flags, product only needed for now. 3638#ifdef _LP64 3639#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3640#else 3641#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3642#endif // _LP64 3643 3644// Implementation macros 3645#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3646#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3647#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3648#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3649#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3650#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3651#ifdef PRODUCT 3652#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3653#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3654#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3655#else 3656#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3657#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3658#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3659#endif 3660#ifdef _LP64 3661#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3662#else 3663#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3664#endif // _LP64 3665 3666RUNTIME_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) 3667 3668RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3669 3670ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3671 3672// Extensions 3673 3674#include "runtime/globals_ext.hpp" 3675 3676#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3677