globals.hpp revision 2559:eb94b7226b7a
1/* 2 * Copyright (c) 1997, 2011, 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#ifdef TARGET_ARCH_x86 30# include "globals_x86.hpp" 31#endif 32#ifdef TARGET_ARCH_sparc 33# include "globals_sparc.hpp" 34#endif 35#ifdef TARGET_ARCH_zero 36# include "globals_zero.hpp" 37#endif 38#ifdef TARGET_ARCH_arm 39# include "globals_arm.hpp" 40#endif 41#ifdef TARGET_ARCH_ppc 42# include "globals_ppc.hpp" 43#endif 44#ifdef TARGET_OS_FAMILY_linux 45# include "globals_linux.hpp" 46#endif 47#ifdef TARGET_OS_FAMILY_solaris 48# include "globals_solaris.hpp" 49#endif 50#ifdef TARGET_OS_FAMILY_windows 51# include "globals_windows.hpp" 52#endif 53#ifdef TARGET_OS_ARCH_linux_x86 54# include "globals_linux_x86.hpp" 55#endif 56#ifdef TARGET_OS_ARCH_linux_sparc 57# include "globals_linux_sparc.hpp" 58#endif 59#ifdef TARGET_OS_ARCH_linux_zero 60# include "globals_linux_zero.hpp" 61#endif 62#ifdef TARGET_OS_ARCH_solaris_x86 63# include "globals_solaris_x86.hpp" 64#endif 65#ifdef TARGET_OS_ARCH_solaris_sparc 66# include "globals_solaris_sparc.hpp" 67#endif 68#ifdef TARGET_OS_ARCH_windows_x86 69# include "globals_windows_x86.hpp" 70#endif 71#ifdef TARGET_OS_ARCH_linux_arm 72# include "globals_linux_arm.hpp" 73#endif 74#ifdef TARGET_OS_ARCH_linux_ppc 75# include "globals_linux_ppc.hpp" 76#endif 77#ifdef COMPILER1 78#ifdef TARGET_ARCH_x86 79# include "c1_globals_x86.hpp" 80#endif 81#ifdef TARGET_ARCH_sparc 82# include "c1_globals_sparc.hpp" 83#endif 84#ifdef TARGET_ARCH_arm 85# include "c1_globals_arm.hpp" 86#endif 87#ifdef TARGET_ARCH_ppc 88# include "c1_globals_ppc.hpp" 89#endif 90#ifdef TARGET_OS_FAMILY_linux 91# include "c1_globals_linux.hpp" 92#endif 93#ifdef TARGET_OS_FAMILY_solaris 94# include "c1_globals_solaris.hpp" 95#endif 96#ifdef TARGET_OS_FAMILY_windows 97# include "c1_globals_windows.hpp" 98#endif 99#endif 100#ifdef COMPILER2 101#ifdef TARGET_ARCH_x86 102# include "c2_globals_x86.hpp" 103#endif 104#ifdef TARGET_ARCH_sparc 105# include "c2_globals_sparc.hpp" 106#endif 107#ifdef TARGET_ARCH_arm 108# include "c2_globals_arm.hpp" 109#endif 110#ifdef TARGET_OS_FAMILY_linux 111# include "c2_globals_linux.hpp" 112#endif 113#ifdef TARGET_OS_FAMILY_solaris 114# include "c2_globals_solaris.hpp" 115#endif 116#ifdef TARGET_OS_FAMILY_windows 117# include "c2_globals_windows.hpp" 118#endif 119#endif 120#ifdef SHARK 121#ifdef TARGET_ARCH_zero 122# include "shark_globals_zero.hpp" 123#endif 124#endif 125 126#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 127define_pd_global(bool, BackgroundCompilation, false); 128define_pd_global(bool, UseTLAB, false); 129define_pd_global(bool, CICompileOSR, false); 130define_pd_global(bool, UseTypeProfile, false); 131define_pd_global(bool, UseOnStackReplacement, false); 132define_pd_global(bool, InlineIntrinsics, false); 133define_pd_global(bool, PreferInterpreterNativeStubs, true); 134define_pd_global(bool, ProfileInterpreter, false); 135define_pd_global(bool, ProfileTraps, false); 136define_pd_global(bool, TieredCompilation, false); 137 138define_pd_global(intx, CompileThreshold, 0); 139define_pd_global(intx, BackEdgeThreshold, 0); 140 141define_pd_global(intx, OnStackReplacePercentage, 0); 142define_pd_global(bool, ResizeTLAB, false); 143define_pd_global(intx, FreqInlineSize, 0); 144define_pd_global(intx, InlineSmallCode, 0); 145define_pd_global(intx, NewSizeThreadIncrease, 4*K); 146define_pd_global(intx, InlineClassNatives, true); 147define_pd_global(intx, InlineUnsafeOps, true); 148define_pd_global(intx, InitialCodeCacheSize, 160*K); 149define_pd_global(intx, ReservedCodeCacheSize, 32*M); 150define_pd_global(intx, CodeCacheExpansionSize, 32*K); 151define_pd_global(intx, CodeCacheMinBlockLength, 1); 152define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 153define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 154define_pd_global(bool, NeverActAsServerClassMachine, true); 155define_pd_global(uint64_t,MaxRAM, 1ULL*G); 156#define CI_COMPILER_COUNT 0 157#else 158 159#ifdef COMPILER2 160#define CI_COMPILER_COUNT 2 161#else 162#define CI_COMPILER_COUNT 1 163#endif // COMPILER2 164 165#endif // no compilers 166 167 168// string type aliases used only in this file 169typedef const char* ccstr; 170typedef const char* ccstrlist; // represents string arguments which accumulate 171 172enum FlagValueOrigin { 173 DEFAULT = 0, 174 COMMAND_LINE = 1, 175 ENVIRON_VAR = 2, 176 CONFIG_FILE = 3, 177 MANAGEMENT = 4, 178 ERGONOMIC = 5, 179 ATTACH_ON_DEMAND = 6, 180 INTERNAL = 99 181}; 182 183struct Flag { 184 const char *type; 185 const char *name; 186 void* addr; 187 188 NOT_PRODUCT(const char *doc;) 189 190 const char *kind; 191 FlagValueOrigin origin; 192 193 // points to all Flags static array 194 static Flag *flags; 195 196 // number of flags 197 static size_t numFlags; 198 199 static Flag* find_flag(char* name, size_t length); 200 201 bool is_bool() const { return strcmp(type, "bool") == 0; } 202 bool get_bool() const { return *((bool*) addr); } 203 void set_bool(bool value) { *((bool*) addr) = value; } 204 205 bool is_intx() const { return strcmp(type, "intx") == 0; } 206 intx get_intx() const { return *((intx*) addr); } 207 void set_intx(intx value) { *((intx*) addr) = value; } 208 209 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 210 uintx get_uintx() const { return *((uintx*) addr); } 211 void set_uintx(uintx value) { *((uintx*) addr) = value; } 212 213 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 214 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 215 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 216 217 bool is_double() const { return strcmp(type, "double") == 0; } 218 double get_double() const { return *((double*) addr); } 219 void set_double(double value) { *((double*) addr) = value; } 220 221 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 222 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 223 ccstr get_ccstr() const { return *((ccstr*) addr); } 224 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 225 226 bool is_unlocker() const; 227 bool is_unlocked() const; 228 bool is_writeable() const; 229 bool is_external() const; 230 231 void print_on(outputStream* st, bool withComments = false ); 232 void print_as_flag(outputStream* st); 233}; 234 235// debug flags control various aspects of the VM and are global accessible 236 237// use FlagSetting to temporarily change some debug flag 238// e.g. FlagSetting fs(DebugThisAndThat, true); 239// restored to previous value upon leaving scope 240class FlagSetting { 241 bool val; 242 bool* flag; 243 public: 244 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 245 ~FlagSetting() { *flag = val; } 246}; 247 248 249class CounterSetting { 250 intx* counter; 251 public: 252 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 253 ~CounterSetting() { (*counter)--; } 254}; 255 256 257class IntFlagSetting { 258 intx val; 259 intx* flag; 260 public: 261 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 262 ~IntFlagSetting() { *flag = val; } 263}; 264 265 266class DoubleFlagSetting { 267 double val; 268 double* flag; 269 public: 270 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 271 ~DoubleFlagSetting() { *flag = val; } 272}; 273 274 275class CommandLineFlags { 276 public: 277 static bool boolAt(char* name, size_t len, bool* value); 278 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 279 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 280 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 281 282 static bool intxAt(char* name, size_t len, intx* value); 283 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 284 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 285 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 286 287 static bool uintxAt(char* name, size_t len, uintx* value); 288 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 289 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 290 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 291 292 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 293 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 294 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 295 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 296 297 static bool doubleAt(char* name, size_t len, double* value); 298 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 299 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 300 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 301 302 static bool ccstrAt(char* name, size_t len, ccstr* value); 303 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 304 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 305 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 306 307 // Returns false if name is not a command line flag. 308 static bool wasSetOnCmdline(const char* name, bool* value); 309 static void printSetFlags(); 310 311 static void printFlags(bool withComments = false ); 312 313 static void verify() PRODUCT_RETURN; 314}; 315 316// use this for flags that are true by default in the debug version but 317// false in the optimized version, and vice versa 318#ifdef ASSERT 319#define trueInDebug true 320#define falseInDebug false 321#else 322#define trueInDebug false 323#define falseInDebug true 324#endif 325 326// use this for flags that are true per default in the product build 327// but false in development builds, and vice versa 328#ifdef PRODUCT 329#define trueInProduct true 330#define falseInProduct false 331#else 332#define trueInProduct false 333#define falseInProduct true 334#endif 335 336// use this for flags that are true per default in the tiered build 337// but false in non-tiered builds, and vice versa 338#ifdef TIERED 339#define trueInTiered true 340#define falseInTiered false 341#else 342#define trueInTiered false 343#define falseInTiered true 344#endif 345 346#ifdef JAVASE_EMBEDDED 347#define falseInEmbedded false 348#else 349#define falseInEmbedded true 350#endif 351 352// develop flags are settable / visible only during development and are constant in the PRODUCT version 353// product flags are always settable / visible 354// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 355 356// A flag must be declared with one of the following types: 357// bool, intx, uintx, ccstr. 358// The type "ccstr" is an alias for "const char*" and is used 359// only in this file, because the macrology requires single-token type names. 360 361// Note: Diagnostic options not meant for VM tuning or for product modes. 362// They are to be used for VM quality assurance or field diagnosis 363// of VM bugs. They are hidden so that users will not be encouraged to 364// try them as if they were VM ordinary execution options. However, they 365// are available in the product version of the VM. Under instruction 366// from support engineers, VM customers can turn them on to collect 367// diagnostic information about VM problems. To use a VM diagnostic 368// option, you must first specify +UnlockDiagnosticVMOptions. 369// (This master switch also affects the behavior of -Xprintflags.) 370// 371// experimental flags are in support of features that are not 372// part of the officially supported product, but are available 373// for experimenting with. They could, for example, be performance 374// features that may not have undergone full or rigorous QA, but which may 375// help performance in some cases and released for experimentation 376// by the community of users and developers. This flag also allows one to 377// be able to build a fully supported product that nonetheless also 378// ships with some unsupported, lightly tested, experimental features. 379// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 380// UnlockExperimentalVMOptions flag, which allows the control and 381// modification of the experimental flags. 382// 383// Nota bene: neither diagnostic nor experimental options should be used casually, 384// and they are not supported on production loads, except under explicit 385// direction from support engineers. 386// 387// manageable flags are writeable external product flags. 388// They are dynamically writeable through the JDK management interface 389// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 390// These flags are external exported interface (see CCC). The list of 391// manageable flags can be queried programmatically through the management 392// interface. 393// 394// A flag can be made as "manageable" only if 395// - the flag is defined in a CCC as an external exported interface. 396// - the VM implementation supports dynamic setting of the flag. 397// This implies that the VM must *always* query the flag variable 398// and not reuse state related to the flag state at any given time. 399// - you want the flag to be queried programmatically by the customers. 400// 401// product_rw flags are writeable internal product flags. 402// They are like "manageable" flags but for internal/private use. 403// The list of product_rw flags are internal/private flags which 404// may be changed/removed in a future release. It can be set 405// through the management interface to get/set value 406// when the name of flag is supplied. 407// 408// A flag can be made as "product_rw" only if 409// - the VM implementation supports dynamic setting of the flag. 410// This implies that the VM must *always* query the flag variable 411// and not reuse state related to the flag state at any given time. 412// 413// Note that when there is a need to support develop flags to be writeable, 414// it can be done in the same way as product_rw. 415 416#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 417 \ 418 lp64_product(bool, UseCompressedOops, false, \ 419 "Use 32-bit object references in 64-bit VM. " \ 420 "lp64_product means flag is always constant in 32 bit VM") \ 421 \ 422 notproduct(bool, CheckCompressedOops, true, \ 423 "generate checks in encoding/decoding code in debug VM") \ 424 \ 425 product_pd(uintx, HeapBaseMinAddress, \ 426 "OS specific low limit for heap base address") \ 427 \ 428 diagnostic(bool, PrintCompressedOopsMode, false, \ 429 "Print compressed oops base address and encoding mode") \ 430 \ 431 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 432 "Default object alignment in bytes, 8 is minimum") \ 433 \ 434 /* UseMembar is theoretically a temp flag used for memory barrier \ 435 * removal testing. It was supposed to be removed before FCS but has \ 436 * been re-added (see 6401008) */ \ 437 product_pd(bool, UseMembar, \ 438 "(Unstable) Issues membars on thread state transitions") \ 439 \ 440 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 441 * that don't support it. This will be replaced by processor detection \ 442 * logic. \ 443 */ \ 444 product(bool, UsePPCLWSYNC, true, \ 445 "Use lwsync instruction if true, else use slower sync") \ 446 \ 447 /* Temporary: See 6948537 */ \ 448 experimental(bool, UseMemSetInBOT, true, \ 449 "(Unstable) uses memset in BOT updates in GC code") \ 450 \ 451 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 452 "Enable normal processing of flags relating to field diagnostics")\ 453 \ 454 experimental(bool, UnlockExperimentalVMOptions, false, \ 455 "Enable normal processing of flags relating to experimental features")\ 456 \ 457 product(bool, JavaMonitorsInStackTrace, true, \ 458 "Print info. about Java monitor locks when the stacks are dumped")\ 459 \ 460 product_pd(bool, UseLargePages, \ 461 "Use large page memory") \ 462 \ 463 product_pd(bool, UseLargePagesIndividualAllocation, \ 464 "Allocate large pages individually for better affinity") \ 465 \ 466 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 467 "Fail large pages individual allocation") \ 468 \ 469 develop(bool, TracePageSizes, false, \ 470 "Trace page size selection and usage.") \ 471 \ 472 product(bool, UseNUMA, false, \ 473 "Use NUMA if available") \ 474 \ 475 product(bool, ForceNUMA, false, \ 476 "Force NUMA optimizations on single-node/UMA systems") \ 477 \ 478 product(intx, NUMAChunkResizeWeight, 20, \ 479 "Percentage (0-100) used to weight the current sample when " \ 480 "computing exponentially decaying average for " \ 481 "AdaptiveNUMAChunkSizing") \ 482 \ 483 product(intx, NUMASpaceResizeRate, 1*G, \ 484 "Do not reallocate more that this amount per collection") \ 485 \ 486 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 487 "Enable adaptive chunk sizing for NUMA") \ 488 \ 489 product(bool, NUMAStats, false, \ 490 "Print NUMA stats in detailed heap information") \ 491 \ 492 product(intx, NUMAPageScanRate, 256, \ 493 "Maximum number of pages to include in the page scan procedure") \ 494 \ 495 product_pd(bool, NeedsDeoptSuspend, \ 496 "True for register window machines (sparc/ia64)") \ 497 \ 498 product(intx, UseSSE, 99, \ 499 "Highest supported SSE instructions set on x86/x64") \ 500 \ 501 product(uintx, LargePageSizeInBytes, 0, \ 502 "Large page size (0 to let VM choose the page size") \ 503 \ 504 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 505 "Use large pages if max heap is at least this big") \ 506 \ 507 product(bool, ForceTimeHighResolution, false, \ 508 "Using high time resolution(For Win32 only)") \ 509 \ 510 develop(bool, TraceItables, false, \ 511 "Trace initialization and use of itables") \ 512 \ 513 develop(bool, TracePcPatching, false, \ 514 "Trace usage of frame::patch_pc") \ 515 \ 516 develop(bool, TraceJumps, false, \ 517 "Trace assembly jumps in thread ring buffer") \ 518 \ 519 develop(bool, TraceRelocator, false, \ 520 "Trace the bytecode relocator") \ 521 \ 522 develop(bool, TraceLongCompiles, false, \ 523 "Print out every time compilation is longer than " \ 524 "a given threashold") \ 525 \ 526 develop(bool, SafepointALot, false, \ 527 "Generates a lot of safepoints. Works with " \ 528 "GuaranteedSafepointInterval") \ 529 \ 530 product_pd(bool, BackgroundCompilation, \ 531 "A thread requesting compilation is not blocked during " \ 532 "compilation") \ 533 \ 534 product(bool, PrintVMQWaitTime, false, \ 535 "Prints out the waiting time in VM operation queue") \ 536 \ 537 develop(bool, BailoutToInterpreterForThrows, false, \ 538 "Compiled methods which throws/catches exceptions will be " \ 539 "deopt and intp.") \ 540 \ 541 develop(bool, NoYieldsInMicrolock, false, \ 542 "Disable yields in microlock") \ 543 \ 544 develop(bool, TraceOopMapGeneration, false, \ 545 "Shows oopmap generation") \ 546 \ 547 product(bool, MethodFlushing, true, \ 548 "Reclamation of zombie and not-entrant methods") \ 549 \ 550 develop(bool, VerifyStack, false, \ 551 "Verify stack of each thread when it is entering a runtime call") \ 552 \ 553 develop(bool, ForceUnreachable, false, \ 554 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 555 \ 556 notproduct(bool, StressDerivedPointers, false, \ 557 "Force scavenge when a derived pointers is detected on stack " \ 558 "after rtm call") \ 559 \ 560 develop(bool, TraceDerivedPointers, false, \ 561 "Trace traversal of derived pointers on stack") \ 562 \ 563 notproduct(bool, TraceCodeBlobStacks, false, \ 564 "Trace stack-walk of codeblobs") \ 565 \ 566 product(bool, PrintJNIResolving, false, \ 567 "Used to implement -v:jni") \ 568 \ 569 notproduct(bool, PrintRewrites, false, \ 570 "Print methods that are being rewritten") \ 571 \ 572 product(bool, UseInlineCaches, true, \ 573 "Use Inline Caches for virtual calls ") \ 574 \ 575 develop(bool, InlineArrayCopy, true, \ 576 "inline arraycopy native that is known to be part of " \ 577 "base library DLL") \ 578 \ 579 develop(bool, InlineObjectHash, true, \ 580 "inline Object::hashCode() native that is known to be part " \ 581 "of base library DLL") \ 582 \ 583 develop(bool, InlineObjectCopy, true, \ 584 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 585 \ 586 develop(bool, InlineNatives, true, \ 587 "inline natives that are known to be part of base library DLL") \ 588 \ 589 develop(bool, InlineMathNatives, true, \ 590 "inline SinD, CosD, etc.") \ 591 \ 592 develop(bool, InlineClassNatives, true, \ 593 "inline Class.isInstance, etc") \ 594 \ 595 develop(bool, InlineAtomicLong, true, \ 596 "inline sun.misc.AtomicLong") \ 597 \ 598 develop(bool, InlineThreadNatives, true, \ 599 "inline Thread.currentThread, etc") \ 600 \ 601 develop(bool, InlineReflectionGetCallerClass, true, \ 602 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 603 "of base library DLL") \ 604 \ 605 develop(bool, InlineUnsafeOps, true, \ 606 "inline memory ops (native methods) from sun.misc.Unsafe") \ 607 \ 608 develop(bool, ConvertCmpD2CmpF, true, \ 609 "Convert cmpD to cmpF when one input is constant in float range") \ 610 \ 611 develop(bool, ConvertFloat2IntClipping, true, \ 612 "Convert float2int clipping idiom to integer clipping") \ 613 \ 614 develop(bool, SpecialStringCompareTo, true, \ 615 "special version of string compareTo") \ 616 \ 617 develop(bool, SpecialStringIndexOf, true, \ 618 "special version of string indexOf") \ 619 \ 620 develop(bool, SpecialStringEquals, true, \ 621 "special version of string equals") \ 622 \ 623 develop(bool, SpecialArraysEquals, true, \ 624 "special version of Arrays.equals(char[],char[])") \ 625 \ 626 product(bool, UseSSE42Intrinsics, false, \ 627 "SSE4.2 versions of intrinsics") \ 628 \ 629 product(bool, UseCondCardMark, false, \ 630 "Check for already marked card before updating card table") \ 631 \ 632 develop(bool, TraceCallFixup, false, \ 633 "traces all call fixups") \ 634 \ 635 develop(bool, DeoptimizeALot, false, \ 636 "deoptimize at every exit from the runtime system") \ 637 \ 638 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 639 "a comma separated list of bcis to deoptimize at") \ 640 \ 641 product(bool, DeoptimizeRandom, false, \ 642 "deoptimize random frames on random exit from the runtime system")\ 643 \ 644 notproduct(bool, ZombieALot, false, \ 645 "creates zombies (non-entrant) at exit from the runt. system") \ 646 \ 647 product(bool, UnlinkSymbolsALot, false, \ 648 "unlink unreferenced symbols from the symbol table at safepoints")\ 649 \ 650 notproduct(bool, WalkStackALot, false, \ 651 "trace stack (no print) at every exit from the runtime system") \ 652 \ 653 develop(bool, Debugging, false, \ 654 "set when executing debug methods in debug.ccp " \ 655 "(to prevent triggering assertions)") \ 656 \ 657 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 658 "Enable strict checks that safepoints cannot happen for threads " \ 659 "that used No_Safepoint_Verifier") \ 660 \ 661 notproduct(bool, VerifyLastFrame, false, \ 662 "Verify oops on last frame on entry to VM") \ 663 \ 664 develop(bool, TraceHandleAllocation, false, \ 665 "Prints out warnings when suspicious many handles are allocated") \ 666 \ 667 product(bool, UseCompilerSafepoints, true, \ 668 "Stop at safepoints in compiled code") \ 669 \ 670 product(bool, UseSplitVerifier, true, \ 671 "use split verifier with StackMapTable attributes") \ 672 \ 673 product(bool, FailOverToOldVerifier, true, \ 674 "fail over to old verifier when split verifier fails") \ 675 \ 676 develop(bool, ShowSafepointMsgs, false, \ 677 "Show msg. about safepoint synch.") \ 678 \ 679 product(bool, SafepointTimeout, false, \ 680 "Time out and warn or fail after SafepointTimeoutDelay " \ 681 "milliseconds if failed to reach safepoint") \ 682 \ 683 develop(bool, DieOnSafepointTimeout, false, \ 684 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 685 \ 686 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 687 /* typically, at most a few retries are needed */ \ 688 product(intx, SuspendRetryCount, 50, \ 689 "Maximum retry count for an external suspend request") \ 690 \ 691 product(intx, SuspendRetryDelay, 5, \ 692 "Milliseconds to delay per retry (* current_retry_count)") \ 693 \ 694 product(bool, AssertOnSuspendWaitFailure, false, \ 695 "Assert/Guarantee on external suspend wait failure") \ 696 \ 697 product(bool, TraceSuspendWaitFailures, false, \ 698 "Trace external suspend wait failures") \ 699 \ 700 product(bool, MaxFDLimit, true, \ 701 "Bump the number of file descriptors to max in solaris.") \ 702 \ 703 notproduct(bool, LogEvents, trueInDebug, \ 704 "Enable Event log") \ 705 \ 706 product(bool, BytecodeVerificationRemote, true, \ 707 "Enables the Java bytecode verifier for remote classes") \ 708 \ 709 product(bool, BytecodeVerificationLocal, false, \ 710 "Enables the Java bytecode verifier for local classes") \ 711 \ 712 develop(bool, ForceFloatExceptions, trueInDebug, \ 713 "Force exceptions on FP stack under/overflow") \ 714 \ 715 develop(bool, SoftMatchFailure, trueInProduct, \ 716 "If the DFA fails to match a node, print a message and bail out") \ 717 \ 718 develop(bool, VerifyStackAtCalls, false, \ 719 "Verify that the stack pointer is unchanged after calls") \ 720 \ 721 develop(bool, TraceJavaAssertions, false, \ 722 "Trace java language assertions") \ 723 \ 724 notproduct(bool, CheckAssertionStatusDirectives, false, \ 725 "temporary - see javaClasses.cpp") \ 726 \ 727 notproduct(bool, PrintMallocFree, false, \ 728 "Trace calls to C heap malloc/free allocation") \ 729 \ 730 product(bool, PrintOopAddress, false, \ 731 "Always print the location of the oop") \ 732 \ 733 notproduct(bool, VerifyCodeCacheOften, false, \ 734 "Verify compiled-code cache often") \ 735 \ 736 develop(bool, ZapDeadCompiledLocals, false, \ 737 "Zap dead locals in compiler frames") \ 738 \ 739 notproduct(bool, ZapDeadLocalsOld, false, \ 740 "Zap dead locals (old version, zaps all frames when " \ 741 "entering the VM") \ 742 \ 743 notproduct(bool, CheckOopishValues, false, \ 744 "Warn if value contains oop ( requires ZapDeadLocals)") \ 745 \ 746 develop(bool, UseMallocOnly, false, \ 747 "use only malloc/free for allocation (no resource area/arena)") \ 748 \ 749 develop(bool, PrintMalloc, false, \ 750 "print all malloc/free calls") \ 751 \ 752 develop(bool, PrintMallocStatistics, false, \ 753 "print malloc/free statistics") \ 754 \ 755 develop(bool, ZapResourceArea, trueInDebug, \ 756 "Zap freed resource/arena space with 0xABABABAB") \ 757 \ 758 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 759 "Zap freed VM handle space with 0xBCBCBCBC") \ 760 \ 761 develop(bool, ZapJNIHandleArea, trueInDebug, \ 762 "Zap freed JNI handle space with 0xFEFEFEFE") \ 763 \ 764 notproduct(bool, ZapStackSegments, trueInDebug, \ 765 "Zap allocated/freed Stack segments with 0xFADFADED") \ 766 \ 767 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 768 "Zap unused heap space with 0xBAADBABE") \ 769 \ 770 develop(bool, TraceZapUnusedHeapArea, false, \ 771 "Trace zapping of unused heap space") \ 772 \ 773 develop(bool, CheckZapUnusedHeapArea, false, \ 774 "Check zapping of unused heap space") \ 775 \ 776 develop(bool, ZapFillerObjects, trueInDebug, \ 777 "Zap filler objects with 0xDEAFBABE") \ 778 \ 779 develop(bool, PrintVMMessages, true, \ 780 "Print vm messages on console") \ 781 \ 782 product(bool, PrintGCApplicationConcurrentTime, false, \ 783 "Print the time the application has been running") \ 784 \ 785 product(bool, PrintGCApplicationStoppedTime, false, \ 786 "Print the time the application has been stopped") \ 787 \ 788 notproduct(uintx, ErrorHandlerTest, 0, \ 789 "If > 0, provokes an error after VM initialization; the value" \ 790 "determines which error to provoke. See test_error_handler()" \ 791 "in debug.cpp.") \ 792 \ 793 develop(bool, Verbose, false, \ 794 "Prints additional debugging information from other modes") \ 795 \ 796 develop(bool, PrintMiscellaneous, false, \ 797 "Prints uncategorized debugging information (requires +Verbose)") \ 798 \ 799 develop(bool, WizardMode, false, \ 800 "Prints much more debugging information") \ 801 \ 802 product(bool, ShowMessageBoxOnError, false, \ 803 "Keep process alive on VM fatal error") \ 804 \ 805 product(bool, CreateMinidumpOnCrash, false, \ 806 "Create minidump on VM fatal error") \ 807 \ 808 product_pd(bool, UseOSErrorReporting, \ 809 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 810 \ 811 product(bool, SuppressFatalErrorMessage, false, \ 812 "Do NO Fatal Error report [Avoid deadlock]") \ 813 \ 814 product(ccstrlist, OnError, "", \ 815 "Run user-defined commands on fatal error; see VMError.cpp " \ 816 "for examples") \ 817 \ 818 product(ccstrlist, OnOutOfMemoryError, "", \ 819 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 820 \ 821 manageable(bool, HeapDumpBeforeFullGC, false, \ 822 "Dump heap to file before any major stop-world GC") \ 823 \ 824 manageable(bool, HeapDumpAfterFullGC, false, \ 825 "Dump heap to file after any major stop-world GC") \ 826 \ 827 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 828 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 829 \ 830 manageable(ccstr, HeapDumpPath, NULL, \ 831 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 832 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 833 "in the working directory)") \ 834 \ 835 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 836 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 837 "when the heap usage is larger than this") \ 838 \ 839 develop(uintx, HeapDumpSegmentSize, 1*G, \ 840 "Approximate segment size when generating a segmented heap dump") \ 841 \ 842 develop(bool, BreakAtWarning, false, \ 843 "Execute breakpoint upon encountering VM warning") \ 844 \ 845 product_pd(bool, UseVectoredExceptions, \ 846 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 847 \ 848 develop(bool, TraceVMOperation, false, \ 849 "Trace vm operations") \ 850 \ 851 develop(bool, UseFakeTimers, false, \ 852 "Tells whether the VM should use system time or a fake timer") \ 853 \ 854 diagnostic(bool, LogCompilation, false, \ 855 "Log compilation activity in detail to hotspot.log or LogFile") \ 856 \ 857 product(bool, PrintCompilation, false, \ 858 "Print compilations") \ 859 \ 860 diagnostic(bool, TraceNMethodInstalls, false, \ 861 "Trace nmethod intallation") \ 862 \ 863 diagnostic(intx, ScavengeRootsInCode, 1, \ 864 "0: do not allow scavengable oops in the code cache; " \ 865 "1: allow scavenging from the code cache; " \ 866 "2: emit as many constants as the compiler can see") \ 867 \ 868 diagnostic(bool, TraceOSRBreakpoint, false, \ 869 "Trace OSR Breakpoint ") \ 870 \ 871 diagnostic(bool, TraceCompileTriggered, false, \ 872 "Trace compile triggered") \ 873 \ 874 diagnostic(bool, TraceTriggers, false, \ 875 "Trace triggers") \ 876 \ 877 product(bool, AlwaysRestoreFPU, false, \ 878 "Restore the FPU control word after every JNI call (expensive)") \ 879 \ 880 notproduct(bool, PrintCompilation2, false, \ 881 "Print additional statistics per compilation") \ 882 \ 883 diagnostic(bool, PrintAdapterHandlers, false, \ 884 "Print code generated for i2c/c2i adapters") \ 885 \ 886 develop(bool, VerifyAdapterSharing, false, \ 887 "Verify that the code for shared adapters is the equivalent") \ 888 \ 889 diagnostic(bool, PrintAssembly, false, \ 890 "Print assembly code (using external disassembler.so)") \ 891 \ 892 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 893 "Options string passed to disassembler.so") \ 894 \ 895 diagnostic(bool, PrintNMethods, false, \ 896 "Print assembly code for nmethods when generated") \ 897 \ 898 diagnostic(bool, PrintNativeNMethods, false, \ 899 "Print assembly code for native nmethods when generated") \ 900 \ 901 develop(bool, PrintDebugInfo, false, \ 902 "Print debug information for all nmethods when generated") \ 903 \ 904 develop(bool, PrintRelocations, false, \ 905 "Print relocation information for all nmethods when generated") \ 906 \ 907 develop(bool, PrintDependencies, false, \ 908 "Print dependency information for all nmethods when generated") \ 909 \ 910 develop(bool, PrintExceptionHandlers, false, \ 911 "Print exception handler tables for all nmethods when generated") \ 912 \ 913 develop(bool, InterceptOSException, false, \ 914 "Starts debugger when an implicit OS (e.g., NULL) " \ 915 "exception happens") \ 916 \ 917 notproduct(bool, PrintCodeCache, false, \ 918 "Print the compiled_code cache when exiting") \ 919 \ 920 develop(bool, PrintCodeCache2, false, \ 921 "Print detailed info on the compiled_code cache when exiting") \ 922 \ 923 diagnostic(bool, PrintStubCode, false, \ 924 "Print generated stub code") \ 925 \ 926 product(bool, StackTraceInThrowable, true, \ 927 "Collect backtrace in throwable when exception happens") \ 928 \ 929 product(bool, OmitStackTraceInFastThrow, true, \ 930 "Omit backtraces for some 'hot' exceptions in optimized code") \ 931 \ 932 product(bool, ProfilerPrintByteCodeStatistics, false, \ 933 "Prints byte code statictics when dumping profiler output") \ 934 \ 935 product(bool, ProfilerRecordPC, false, \ 936 "Collects tick for each 16 byte interval of compiled code") \ 937 \ 938 product(bool, ProfileVM, false, \ 939 "Profiles ticks that fall within VM (either in the VM Thread " \ 940 "or VM code called through stubs)") \ 941 \ 942 product(bool, ProfileIntervals, false, \ 943 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 944 \ 945 notproduct(bool, ProfilerCheckIntervals, false, \ 946 "Collect and print info on spacing of profiler ticks") \ 947 \ 948 develop(bool, PrintJVMWarnings, false, \ 949 "Prints warnings for unimplemented JVM functions") \ 950 \ 951 product(bool, PrintWarnings, true, \ 952 "Prints JVM warnings to output stream") \ 953 \ 954 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 955 "Prints warnings for stalled SpinLocks") \ 956 \ 957 develop(bool, InitializeJavaLangSystem, true, \ 958 "Initialize java.lang.System - turn off for individual " \ 959 "method debugging") \ 960 \ 961 develop(bool, InitializeJavaLangString, true, \ 962 "Initialize java.lang.String - turn off for individual " \ 963 "method debugging") \ 964 \ 965 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 966 "Initialize various error and exception classes - turn off for " \ 967 "individual method debugging") \ 968 \ 969 product(bool, RegisterFinalizersAtInit, true, \ 970 "Register finalizable objects at end of Object.<init> or " \ 971 "after allocation") \ 972 \ 973 develop(bool, RegisterReferences, true, \ 974 "Tells whether the VM should register soft/weak/final/phantom " \ 975 "references") \ 976 \ 977 develop(bool, IgnoreRewrites, false, \ 978 "Supress rewrites of bytecodes in the oopmap generator. " \ 979 "This is unsafe!") \ 980 \ 981 develop(bool, PrintCodeCacheExtension, false, \ 982 "Print extension of code cache") \ 983 \ 984 develop(bool, UsePrivilegedStack, true, \ 985 "Enable the security JVM functions") \ 986 \ 987 develop(bool, IEEEPrecision, true, \ 988 "Enables IEEE precision (for INTEL only)") \ 989 \ 990 develop(bool, ProtectionDomainVerification, true, \ 991 "Verifies protection domain before resolution in system " \ 992 "dictionary") \ 993 \ 994 product(bool, ClassUnloading, true, \ 995 "Do unloading of classes") \ 996 \ 997 diagnostic(bool, LinkWellKnownClasses, false, \ 998 "Resolve a well known class as soon as its name is seen") \ 999 \ 1000 develop(bool, DisableStartThread, false, \ 1001 "Disable starting of additional Java threads " \ 1002 "(for debugging only)") \ 1003 \ 1004 develop(bool, MemProfiling, false, \ 1005 "Write memory usage profiling to log file") \ 1006 \ 1007 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1008 "Prints the system dictionary at exit") \ 1009 \ 1010 diagnostic(bool, UnsyncloadClass, false, \ 1011 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1012 "class loader must call VM synchronized for findClass " \ 1013 "and defineClass.") \ 1014 \ 1015 product(bool, AlwaysLockClassLoader, false, \ 1016 "Require the VM to acquire the class loader lock before calling " \ 1017 "loadClass() even for class loaders registering " \ 1018 "as parallel capable") \ 1019 \ 1020 product(bool, AllowParallelDefineClass, false, \ 1021 "Allow parallel defineClass requests for class loaders " \ 1022 "registering as parallel capable") \ 1023 \ 1024 product(bool, MustCallLoadClassInternal, false, \ 1025 "Call loadClassInternal() rather than loadClass()") \ 1026 \ 1027 product_pd(bool, DontYieldALot, \ 1028 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1029 \ 1030 product_pd(bool, ConvertSleepToYield, \ 1031 "Converts sleep(0) to thread yield " \ 1032 "(may be off for SOLARIS to improve GUI)") \ 1033 \ 1034 product(bool, ConvertYieldToSleep, false, \ 1035 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1036 "behavior (SOLARIS only)") \ 1037 \ 1038 product(bool, UseBoundThreads, true, \ 1039 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1040 \ 1041 develop(bool, UseDetachedThreads, true, \ 1042 "Use detached threads that are recycled upon termination " \ 1043 "(for SOLARIS only)") \ 1044 \ 1045 product(bool, UseLWPSynchronization, true, \ 1046 "Use LWP-based instead of libthread-based synchronization " \ 1047 "(SPARC only)") \ 1048 \ 1049 product(ccstr, SyncKnobs, NULL, \ 1050 "(Unstable) Various monitor synchronization tunables") \ 1051 \ 1052 product(intx, EmitSync, 0, \ 1053 "(Unsafe,Unstable) " \ 1054 " Controls emission of inline sync fast-path code") \ 1055 \ 1056 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1057 \ 1058 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1059 \ 1060 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1061 \ 1062 product(intx, Atomics, 0, \ 1063 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1064 \ 1065 product(intx, FenceInstruction, 0, \ 1066 "(Unsafe,Unstable) Experimental") \ 1067 \ 1068 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1069 \ 1070 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1071 \ 1072 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1073 \ 1074 product(intx, hashCode, 0, \ 1075 "(Unstable) select hashCode generation algorithm" ) \ 1076 \ 1077 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1078 "(Unstable, Linux-specific)" \ 1079 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1080 \ 1081 product(bool, FilterSpuriousWakeups, true, \ 1082 "Prevent spurious or premature wakeups from object.wait " \ 1083 "(Solaris only)") \ 1084 \ 1085 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1086 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1087 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1088 \ 1089 develop(bool, UsePthreads, false, \ 1090 "Use pthread-based instead of libthread-based synchronization " \ 1091 "(SPARC only)") \ 1092 \ 1093 product(bool, AdjustConcurrency, false, \ 1094 "call thr_setconcurrency at thread create time to avoid " \ 1095 "LWP starvation on MP systems (For Solaris Only)") \ 1096 \ 1097 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1098 "Should the system attempt to update the compiler file when " \ 1099 "an error occurs?") \ 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, UseSpinning, false, \ 1136 "Use spinning in monitor inflation and before entry") \ 1137 \ 1138 product(bool, PreSpinYield, false, \ 1139 "Yield before inner spinning loop") \ 1140 \ 1141 product(bool, PostSpinYield, true, \ 1142 "Yield after inner spinning loop") \ 1143 \ 1144 product(bool, AllowJNIEnvProxy, false, \ 1145 "Allow JNIEnv proxies for jdbx") \ 1146 \ 1147 product(bool, JNIDetachReleasesMonitors, true, \ 1148 "JNI DetachCurrentThread releases monitors owned by thread") \ 1149 \ 1150 product(bool, RestoreMXCSROnJNICalls, false, \ 1151 "Restore MXCSR when returning from JNI calls") \ 1152 \ 1153 product(bool, CheckJNICalls, false, \ 1154 "Verify all arguments to JNI calls") \ 1155 \ 1156 product(bool, UseFastJNIAccessors, true, \ 1157 "Use optimized versions of Get<Primitive>Field") \ 1158 \ 1159 product(bool, EagerXrunInit, false, \ 1160 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1161 " but not all -Xrun libraries may support the state of the VM at this time") \ 1162 \ 1163 product(bool, PreserveAllAnnotations, false, \ 1164 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1165 \ 1166 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1167 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1168 \ 1169 product(bool, LazyBootClassLoader, true, \ 1170 "Enable/disable lazy opening of boot class path entries") \ 1171 \ 1172 diagnostic(bool, UseIncDec, true, \ 1173 "Use INC, DEC instructions on x86") \ 1174 \ 1175 product(bool, UseNewLongLShift, false, \ 1176 "Use optimized bitwise shift left") \ 1177 \ 1178 product(bool, UseStoreImmI16, true, \ 1179 "Use store immediate 16-bits value instruction on x86") \ 1180 \ 1181 product(bool, UseAddressNop, false, \ 1182 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1183 \ 1184 product(bool, UseXmmLoadAndClearUpper, true, \ 1185 "Load low part of XMM register and clear upper part") \ 1186 \ 1187 product(bool, UseXmmRegToRegMoveAll, false, \ 1188 "Copy all XMM register bits when moving value between registers") \ 1189 \ 1190 product(bool, UseXmmI2D, false, \ 1191 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1192 \ 1193 product(bool, UseXmmI2F, false, \ 1194 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1195 \ 1196 product(bool, UseXMMForArrayCopy, false, \ 1197 "Use SSE2 MOVQ instruction for Arraycopy") \ 1198 \ 1199 product(bool, UseUnalignedLoadStores, false, \ 1200 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1201 \ 1202 product(intx, FieldsAllocationStyle, 1, \ 1203 "0 - type based with oops first, 1 - with oops last, " \ 1204 "2 - oops in super and sub classes are together") \ 1205 \ 1206 product(bool, CompactFields, true, \ 1207 "Allocate nonstatic fields in gaps between previous fields") \ 1208 \ 1209 notproduct(bool, PrintCompactFieldsSavings, false, \ 1210 "Print how many words were saved with CompactFields") \ 1211 \ 1212 product(bool, UseBiasedLocking, true, \ 1213 "Enable biased locking in JVM") \ 1214 \ 1215 product(intx, BiasedLockingStartupDelay, 4000, \ 1216 "Number of milliseconds to wait before enabling biased locking") \ 1217 \ 1218 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1219 "Print statistics of biased locking in JVM") \ 1220 \ 1221 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1222 "Threshold of number of revocations per type to try to " \ 1223 "rebias all objects in the heap of that type") \ 1224 \ 1225 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1226 "Threshold of number of revocations per type to permanently " \ 1227 "revoke biases of all objects in the heap of that type") \ 1228 \ 1229 product(intx, BiasedLockingDecayTime, 25000, \ 1230 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1231 "type after previous bulk rebias") \ 1232 \ 1233 develop(bool, JavaObjectsInPerm, false, \ 1234 "controls whether Classes and interned Strings are allocated" \ 1235 "in perm. This purely intended to allow debugging issues" \ 1236 "in production.") \ 1237 \ 1238 /* tracing */ \ 1239 \ 1240 notproduct(bool, TraceRuntimeCalls, false, \ 1241 "Trace run-time calls") \ 1242 \ 1243 develop(bool, TraceJNICalls, false, \ 1244 "Trace JNI calls") \ 1245 \ 1246 notproduct(bool, TraceJVMCalls, false, \ 1247 "Trace JVM calls") \ 1248 \ 1249 product(ccstr, TraceJVMTI, NULL, \ 1250 "Trace flags for JVMTI functions and events") \ 1251 \ 1252 /* This option can change an EMCP method into an obsolete method. */ \ 1253 /* This can affect tests that except specific methods to be EMCP. */ \ 1254 /* This option should be used with caution. */ \ 1255 product(bool, StressLdcRewrite, false, \ 1256 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1257 \ 1258 product(intx, TraceRedefineClasses, 0, \ 1259 "Trace level for JVMTI RedefineClasses") \ 1260 \ 1261 develop(bool, StressMethodComparator, false, \ 1262 "run the MethodComparator on all loaded methods") \ 1263 \ 1264 /* change to false by default sometime after Mustang */ \ 1265 product(bool, VerifyMergedCPBytecodes, true, \ 1266 "Verify bytecodes after RedefineClasses constant pool merging") \ 1267 \ 1268 develop(bool, TraceJNIHandleAllocation, false, \ 1269 "Trace allocation/deallocation of JNI handle blocks") \ 1270 \ 1271 develop(bool, TraceThreadEvents, false, \ 1272 "Trace all thread events") \ 1273 \ 1274 develop(bool, TraceBytecodes, false, \ 1275 "Trace bytecode execution") \ 1276 \ 1277 develop(bool, TraceClassInitialization, false, \ 1278 "Trace class initialization") \ 1279 \ 1280 develop(bool, TraceExceptions, false, \ 1281 "Trace exceptions") \ 1282 \ 1283 develop(bool, TraceICs, false, \ 1284 "Trace inline cache changes") \ 1285 \ 1286 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1287 "Trace method invocation counter overflow") \ 1288 \ 1289 develop(bool, TraceInlineCacheClearing, false, \ 1290 "Trace clearing of inline caches in nmethods") \ 1291 \ 1292 develop(bool, TraceDependencies, false, \ 1293 "Trace dependencies") \ 1294 \ 1295 develop(bool, VerifyDependencies, trueInDebug, \ 1296 "Exercise and verify the compilation dependency mechanism") \ 1297 \ 1298 develop(bool, TraceNewOopMapGeneration, false, \ 1299 "Trace OopMapGeneration") \ 1300 \ 1301 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1302 "Trace OopMapGeneration: print detailed cell states") \ 1303 \ 1304 develop(bool, TimeOopMap, false, \ 1305 "Time calls to GenerateOopMap::compute_map() in sum") \ 1306 \ 1307 develop(bool, TimeOopMap2, false, \ 1308 "Time calls to GenerateOopMap::compute_map() individually") \ 1309 \ 1310 develop(bool, TraceMonitorMismatch, false, \ 1311 "Trace monitor matching failures during OopMapGeneration") \ 1312 \ 1313 develop(bool, TraceOopMapRewrites, false, \ 1314 "Trace rewritting of method oops during oop map generation") \ 1315 \ 1316 develop(bool, TraceSafepoint, false, \ 1317 "Trace safepoint operations") \ 1318 \ 1319 develop(bool, TraceICBuffer, false, \ 1320 "Trace usage of IC buffer") \ 1321 \ 1322 develop(bool, TraceCompiledIC, false, \ 1323 "Trace changes of compiled IC") \ 1324 \ 1325 notproduct(bool, TraceZapDeadLocals, false, \ 1326 "Trace zapping dead locals") \ 1327 \ 1328 develop(bool, TraceStartupTime, false, \ 1329 "Trace setup time") \ 1330 \ 1331 product(ccstr, HPILibPath, NULL, \ 1332 "Specify alternate path to HPI library") \ 1333 \ 1334 develop(bool, TraceProtectionDomainVerification, false, \ 1335 "Trace protection domain verifcation") \ 1336 \ 1337 develop(bool, TraceClearedExceptions, false, \ 1338 "Prints when an exception is forcibly cleared") \ 1339 \ 1340 product(bool, TraceClassResolution, false, \ 1341 "Trace all constant pool resolutions (for debugging)") \ 1342 \ 1343 product(bool, TraceBiasedLocking, false, \ 1344 "Trace biased locking in JVM") \ 1345 \ 1346 product(bool, TraceMonitorInflation, false, \ 1347 "Trace monitor inflation in JVM") \ 1348 \ 1349 /* assembler */ \ 1350 product(bool, Use486InstrsOnly, false, \ 1351 "Use 80486 Compliant instruction subset") \ 1352 \ 1353 /* gc */ \ 1354 \ 1355 product(bool, UseSerialGC, false, \ 1356 "Use the serial garbage collector") \ 1357 \ 1358 product(bool, UseG1GC, false, \ 1359 "Use the Garbage-First garbage collector") \ 1360 \ 1361 product(bool, UseParallelGC, false, \ 1362 "Use the Parallel Scavenge garbage collector") \ 1363 \ 1364 product(bool, UseParallelOldGC, false, \ 1365 "Use the Parallel Old garbage collector") \ 1366 \ 1367 product(uintx, HeapMaximumCompactionInterval, 20, \ 1368 "How often should we maximally compact the heap (not allowing " \ 1369 "any dead space)") \ 1370 \ 1371 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1372 "The collection count for the first maximum compaction") \ 1373 \ 1374 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1375 "In the Parallel Old garbage collector maximum compaction for " \ 1376 "a system GC") \ 1377 \ 1378 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1379 "The mean used by the par compact dead wood" \ 1380 "limiter (a number between 0-100).") \ 1381 \ 1382 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1383 "The standard deviation used by the par compact dead wood" \ 1384 "limiter (a number between 0-100).") \ 1385 \ 1386 product(uintx, ParallelGCThreads, 0, \ 1387 "Number of parallel threads parallel gc will use") \ 1388 \ 1389 develop(bool, ParallelOldGCSplitALot, false, \ 1390 "Provoke splitting (copying data from a young gen space to" \ 1391 "multiple destination spaces)") \ 1392 \ 1393 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1394 "How often to provoke splitting a young gen space") \ 1395 \ 1396 develop(bool, TraceRegionTasksQueuing, false, \ 1397 "Trace the queuing of the region tasks") \ 1398 \ 1399 product(uintx, ConcGCThreads, 0, \ 1400 "Number of threads concurrent gc will use") \ 1401 \ 1402 product(uintx, YoungPLABSize, 4096, \ 1403 "Size of young gen promotion labs (in HeapWords)") \ 1404 \ 1405 product(uintx, OldPLABSize, 1024, \ 1406 "Size of old gen promotion labs (in HeapWords)") \ 1407 \ 1408 product(uintx, GCTaskTimeStampEntries, 200, \ 1409 "Number of time stamp entries per gc worker thread") \ 1410 \ 1411 product(bool, AlwaysTenure, false, \ 1412 "Always tenure objects in eden. (ParallelGC only)") \ 1413 \ 1414 product(bool, NeverTenure, false, \ 1415 "Never tenure objects in eden, May tenure on overflow " \ 1416 "(ParallelGC only)") \ 1417 \ 1418 product(bool, ScavengeBeforeFullGC, true, \ 1419 "Scavenge youngest generation before each full GC, " \ 1420 "used with UseParallelGC") \ 1421 \ 1422 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1423 "Allow scavenges to occur when to_space contains objects.") \ 1424 \ 1425 product(bool, UseConcMarkSweepGC, false, \ 1426 "Use Concurrent Mark-Sweep GC in the old generation") \ 1427 \ 1428 product(bool, ExplicitGCInvokesConcurrent, false, \ 1429 "A System.gc() request invokes a concurrent collection;" \ 1430 " (effective only when UseConcMarkSweepGC)") \ 1431 \ 1432 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1433 "A System.gc() request invokes a concurrent collection and " \ 1434 "also unloads classes during such a concurrent gc cycle " \ 1435 "(effective only when UseConcMarkSweepGC)") \ 1436 \ 1437 product(bool, GCLockerInvokesConcurrent, false, \ 1438 "The exit of a JNI CS necessitating a scavenge also" \ 1439 " kicks off a bkgrd concurrent collection") \ 1440 \ 1441 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1442 "How much the GC can expand the eden by while the GC locker " \ 1443 "is active (as a percentage)") \ 1444 \ 1445 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1446 "Use Adaptive Free Lists in the CMS generation") \ 1447 \ 1448 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1449 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1450 \ 1451 develop(bool, RotateCMSCollectionTypes, false, \ 1452 "Rotate the CMS collections among concurrent and STW") \ 1453 \ 1454 product(bool, UseCMSBestFit, true, \ 1455 "Use CMS best fit allocation strategy") \ 1456 \ 1457 product(bool, UseCMSCollectionPassing, true, \ 1458 "Use passing of collection from background to foreground") \ 1459 \ 1460 product(bool, UseParNewGC, false, \ 1461 "Use parallel threads in the new generation.") \ 1462 \ 1463 product(bool, ParallelGCVerbose, false, \ 1464 "Verbose output for parallel GC.") \ 1465 \ 1466 product(intx, ParallelGCBufferWastePct, 10, \ 1467 "wasted fraction of parallel allocation buffer.") \ 1468 \ 1469 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1470 "Retain parallel allocation buffers across scavenges; " \ 1471 " -- disabled because this currently conflicts with " \ 1472 " parallel card scanning under certain conditions ") \ 1473 \ 1474 product(intx, TargetPLABWastePct, 10, \ 1475 "target wasted space in last buffer as pct of overall allocation")\ 1476 \ 1477 product(uintx, PLABWeight, 75, \ 1478 "Percentage (0-100) used to weight the current sample when" \ 1479 "computing exponentially decaying average for ResizePLAB.") \ 1480 \ 1481 product(bool, ResizePLAB, true, \ 1482 "Dynamically resize (survivor space) promotion labs") \ 1483 \ 1484 product(bool, PrintPLAB, false, \ 1485 "Print (survivor space) promotion labs sizing decisions") \ 1486 \ 1487 product(intx, ParGCArrayScanChunk, 50, \ 1488 "Scan a subset and push remainder, if array is bigger than this") \ 1489 \ 1490 product(bool, ParGCUseLocalOverflow, false, \ 1491 "Instead of a global overflow list, use local overflow stacks") \ 1492 \ 1493 product(bool, ParGCTrimOverflow, true, \ 1494 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1495 \ 1496 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1497 "Whether we should simulate work queue overflow in ParNew") \ 1498 \ 1499 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1500 "An `interval' counter that determines how frequently " \ 1501 "we simulate overflow; a smaller number increases frequency") \ 1502 \ 1503 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1504 "The desired number of objects to claim from the overflow list") \ 1505 \ 1506 diagnostic(intx, ParGCStridesPerThread, 2, \ 1507 "The number of strides per worker thread that we divide up the " \ 1508 "card table scanning work into") \ 1509 \ 1510 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1511 "The number of cards in each chunk of the parallel chunks used " \ 1512 "during card table scanning") \ 1513 \ 1514 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1515 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1516 "parallel GC.") \ 1517 \ 1518 product(uintx, OldPLABWeight, 50, \ 1519 "Percentage (0-100) used to weight the current sample when" \ 1520 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1521 \ 1522 product(bool, ResizeOldPLAB, true, \ 1523 "Dynamically resize (old gen) promotion labs") \ 1524 \ 1525 product(bool, PrintOldPLAB, false, \ 1526 "Print (old gen) promotion labs sizing decisions") \ 1527 \ 1528 product(uintx, CMSOldPLABMin, 16, \ 1529 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1530 \ 1531 product(uintx, CMSOldPLABMax, 1024, \ 1532 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1533 \ 1534 product(uintx, CMSOldPLABNumRefills, 4, \ 1535 "Nominal number of refills of CMS gen promotion lab cache" \ 1536 " per worker per block size") \ 1537 \ 1538 product(bool, CMSOldPLABResizeQuicker, false, \ 1539 "Whether to react on-the-fly during a scavenge to a sudden" \ 1540 " change in block demand rate") \ 1541 \ 1542 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1543 "The tolerance of the phase-change detector for on-the-fly" \ 1544 " PLAB resizing during a scavenge") \ 1545 \ 1546 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1547 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1548 " during a scavenge") \ 1549 \ 1550 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1551 "The clamping of the gain in the feedback loop for on-the-fly" \ 1552 " PLAB resizing during a scavenge") \ 1553 \ 1554 product(bool, AlwaysPreTouch, false, \ 1555 "It forces all freshly committed pages to be pre-touched.") \ 1556 \ 1557 product_pd(intx, CMSYoungGenPerWorker, \ 1558 "The maximum size of young gen chosen by default per GC worker " \ 1559 "thread available") \ 1560 \ 1561 product(bool, GCOverheadReporting, false, \ 1562 "Enables the GC overhead reporting facility") \ 1563 \ 1564 product(intx, GCOverheadReportingPeriodMS, 100, \ 1565 "Reporting period for conc GC overhead reporting, in ms ") \ 1566 \ 1567 product(bool, CMSIncrementalMode, false, \ 1568 "Whether CMS GC should operate in \"incremental\" mode") \ 1569 \ 1570 product(uintx, CMSIncrementalDutyCycle, 10, \ 1571 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1572 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1573 "value") \ 1574 \ 1575 product(bool, CMSIncrementalPacing, true, \ 1576 "Whether the CMS incremental mode duty cycle should be " \ 1577 "automatically adjusted") \ 1578 \ 1579 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1580 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1581 "enabled (a percentage, 0-100)") \ 1582 \ 1583 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1584 "Percentage (0-100) used to add conservatism when computing the " \ 1585 "duty cycle") \ 1586 \ 1587 product(uintx, CMSIncrementalOffset, 0, \ 1588 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1589 " is shifted to the right within the period between young GCs") \ 1590 \ 1591 product(uintx, CMSExpAvgFactor, 50, \ 1592 "Percentage (0-100) used to weight the current sample when" \ 1593 "computing exponential averages for CMS statistics.") \ 1594 \ 1595 product(uintx, CMS_FLSWeight, 75, \ 1596 "Percentage (0-100) used to weight the current sample when" \ 1597 "computing exponentially decating averages for CMS FLS statistics.") \ 1598 \ 1599 product(uintx, CMS_FLSPadding, 1, \ 1600 "The multiple of deviation from mean to use for buffering" \ 1601 "against volatility in free list demand.") \ 1602 \ 1603 product(uintx, FLSCoalescePolicy, 2, \ 1604 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1605 \ 1606 product(bool, FLSAlwaysCoalesceLarge, false, \ 1607 "CMS: Larger free blocks are always available for coalescing") \ 1608 \ 1609 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1610 "CMS: the smaller the percentage the greater the coalition force")\ 1611 \ 1612 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1613 "CMS: the factor by which to inflate estimated demand of small" \ 1614 " block sizes to prevent coalescing with an adjoining block") \ 1615 \ 1616 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1617 "CMS: the factor by which to inflate estimated demand of large" \ 1618 " block sizes to prevent coalescing with an adjoining block") \ 1619 \ 1620 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1621 "CMS: the factor by which to inflate estimated demand of small" \ 1622 " block sizes to prevent splitting to supply demand for smaller" \ 1623 " blocks") \ 1624 \ 1625 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1626 "CMS: the factor by which to inflate estimated demand of large" \ 1627 " block sizes to prevent splitting to supply demand for smaller" \ 1628 " blocks") \ 1629 \ 1630 product(bool, CMSExtrapolateSweep, false, \ 1631 "CMS: cushion for block demand during sweep") \ 1632 \ 1633 product(uintx, CMS_SweepWeight, 75, \ 1634 "Percentage (0-100) used to weight the current sample when " \ 1635 "computing exponentially decaying average for inter-sweep " \ 1636 "duration") \ 1637 \ 1638 product(uintx, CMS_SweepPadding, 1, \ 1639 "The multiple of deviation from mean to use for buffering " \ 1640 "against volatility in inter-sweep duration.") \ 1641 \ 1642 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1643 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1644 "duration exceeds this threhold in milliseconds") \ 1645 \ 1646 develop(bool, CMSTraceIncrementalMode, false, \ 1647 "Trace CMS incremental mode") \ 1648 \ 1649 develop(bool, CMSTraceIncrementalPacing, false, \ 1650 "Trace CMS incremental mode pacing computation") \ 1651 \ 1652 develop(bool, CMSTraceThreadState, false, \ 1653 "Trace the CMS thread state (enable the trace_state() method)") \ 1654 \ 1655 product(bool, CMSClassUnloadingEnabled, false, \ 1656 "Whether class unloading enabled when using CMS GC") \ 1657 \ 1658 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1659 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1660 " for which classes may not be unloaded") \ 1661 \ 1662 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1663 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1664 \ 1665 product(bool, UseCMSCompactAtFullCollection, true, \ 1666 "Use mark sweep compact at full collections") \ 1667 \ 1668 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1669 "Number of CMS full collection done before compaction if > 0") \ 1670 \ 1671 develop(intx, CMSDictionaryChoice, 0, \ 1672 "Use BinaryTreeDictionary as default in the CMS generation") \ 1673 \ 1674 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1675 "Replenish an indexed free list with this number of chunks") \ 1676 \ 1677 product(bool, CMSReplenishIntermediate, true, \ 1678 "Replenish all intermediate free-list caches") \ 1679 \ 1680 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1681 "When satisfying batched demand, split blocks from the " \ 1682 "IndexedFreeList whose size is a multiple of requested size") \ 1683 \ 1684 product(bool, CMSLoopWarn, false, \ 1685 "Warn in case of excessive CMS looping") \ 1686 \ 1687 develop(bool, CMSOverflowEarlyRestoration, false, \ 1688 "Whether preserved marks should be restored early") \ 1689 \ 1690 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1691 "Size of marking stack") \ 1692 \ 1693 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1694 "Max size of marking stack") \ 1695 \ 1696 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1697 "Whether we should simulate frequent marking stack / work queue" \ 1698 " overflow") \ 1699 \ 1700 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1701 "An `interval' counter that determines how frequently" \ 1702 " we simulate overflow; a smaller number increases frequency") \ 1703 \ 1704 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1705 "(Temporary, subject to experimentation)" \ 1706 "Maximum number of abortable preclean iterations, if > 0") \ 1707 \ 1708 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1709 "(Temporary, subject to experimentation)" \ 1710 "Maximum time in abortable preclean in ms") \ 1711 \ 1712 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1713 "(Temporary, subject to experimentation)" \ 1714 "Nominal minimum work per abortable preclean iteration") \ 1715 \ 1716 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1717 "(Temporary, subject to experimentation)" \ 1718 " Time that we sleep between iterations when not given" \ 1719 " enough work per iteration") \ 1720 \ 1721 product(uintx, CMSRescanMultiple, 32, \ 1722 "Size (in cards) of CMS parallel rescan task") \ 1723 \ 1724 product(uintx, CMSConcMarkMultiple, 32, \ 1725 "Size (in cards) of CMS concurrent MT marking task") \ 1726 \ 1727 product(uintx, CMSRevisitStackSize, 1*M, \ 1728 "Size of CMS KlassKlass revisit stack") \ 1729 \ 1730 product(bool, CMSAbortSemantics, false, \ 1731 "Whether abort-on-overflow semantics is implemented") \ 1732 \ 1733 product(bool, CMSParallelRemarkEnabled, true, \ 1734 "Whether parallel remark enabled (only if ParNewGC)") \ 1735 \ 1736 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1737 "Whether parallel remark of survivor space" \ 1738 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1739 \ 1740 product(bool, CMSPLABRecordAlways, true, \ 1741 "Whether to always record survivor space PLAB bdries" \ 1742 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1743 \ 1744 product(bool, CMSConcurrentMTEnabled, true, \ 1745 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1746 \ 1747 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1748 "Whether concurrent precleaning enabled in perm gen" \ 1749 " (effective only when CMSPrecleaningEnabled is true)") \ 1750 \ 1751 product(bool, CMSPrecleaningEnabled, true, \ 1752 "Whether concurrent precleaning enabled") \ 1753 \ 1754 product(uintx, CMSPrecleanIter, 3, \ 1755 "Maximum number of precleaning iteration passes") \ 1756 \ 1757 product(uintx, CMSPrecleanNumerator, 2, \ 1758 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1759 " ratio") \ 1760 \ 1761 product(uintx, CMSPrecleanDenominator, 3, \ 1762 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1763 " ratio") \ 1764 \ 1765 product(bool, CMSPrecleanRefLists1, true, \ 1766 "Preclean ref lists during (initial) preclean phase") \ 1767 \ 1768 product(bool, CMSPrecleanRefLists2, false, \ 1769 "Preclean ref lists during abortable preclean phase") \ 1770 \ 1771 product(bool, CMSPrecleanSurvivors1, false, \ 1772 "Preclean survivors during (initial) preclean phase") \ 1773 \ 1774 product(bool, CMSPrecleanSurvivors2, true, \ 1775 "Preclean survivors during abortable preclean phase") \ 1776 \ 1777 product(uintx, CMSPrecleanThreshold, 1000, \ 1778 "Don't re-iterate if #dirty cards less than this") \ 1779 \ 1780 product(bool, CMSCleanOnEnter, true, \ 1781 "Clean-on-enter optimization for reducing number of dirty cards") \ 1782 \ 1783 product(uintx, CMSRemarkVerifyVariant, 1, \ 1784 "Choose variant (1,2) of verification following remark") \ 1785 \ 1786 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1787 "If Eden used is below this value, don't try to schedule remark") \ 1788 \ 1789 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1790 "The Eden occupancy % at which to try and schedule remark pause") \ 1791 \ 1792 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1793 "Start sampling Eden top at least before yg occupancy reaches" \ 1794 " 1/<ratio> of the size at which we plan to schedule remark") \ 1795 \ 1796 product(uintx, CMSSamplingGrain, 16*K, \ 1797 "The minimum distance between eden samples for CMS (see above)") \ 1798 \ 1799 product(bool, CMSScavengeBeforeRemark, false, \ 1800 "Attempt scavenge before the CMS remark step") \ 1801 \ 1802 develop(bool, CMSTraceSweeper, false, \ 1803 "Trace some actions of the CMS sweeper") \ 1804 \ 1805 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1806 "Don't drain below this size per parallel worker/thief") \ 1807 \ 1808 manageable(intx, CMSWaitDuration, 2000, \ 1809 "Time in milliseconds that CMS thread waits for young GC") \ 1810 \ 1811 product(bool, CMSYield, true, \ 1812 "Yield between steps of concurrent mark & sweep") \ 1813 \ 1814 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1815 "Bitmap operations should process at most this many bits" \ 1816 "between yields") \ 1817 \ 1818 product(bool, CMSDumpAtPromotionFailure, false, \ 1819 "Dump useful information about the state of the CMS old " \ 1820 " generation upon a promotion failure.") \ 1821 \ 1822 product(bool, CMSPrintChunksInDump, false, \ 1823 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1824 " more detailed information about the free chunks.") \ 1825 \ 1826 product(bool, CMSPrintObjectsInDump, false, \ 1827 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1828 " more detailed information about the allocated objects.") \ 1829 \ 1830 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1831 "Verify that all refs across the FLS boundary " \ 1832 " are to valid objects") \ 1833 \ 1834 diagnostic(bool, FLSVerifyLists, false, \ 1835 "Do lots of (expensive) FreeListSpace verification") \ 1836 \ 1837 diagnostic(bool, FLSVerifyIndexTable, false, \ 1838 "Do lots of (expensive) FLS index table verification") \ 1839 \ 1840 develop(bool, FLSVerifyDictionary, false, \ 1841 "Do lots of (expensive) FLS dictionary verification") \ 1842 \ 1843 develop(bool, VerifyBlockOffsetArray, false, \ 1844 "Do (expensive!) block offset array verification") \ 1845 \ 1846 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1847 "Maintain _unallocated_block in BlockOffsetArray" \ 1848 " (currently applicable only to CMS collector)") \ 1849 \ 1850 develop(bool, TraceCMSState, false, \ 1851 "Trace the state of the CMS collection") \ 1852 \ 1853 product(intx, RefDiscoveryPolicy, 0, \ 1854 "Whether reference-based(0) or referent-based(1)") \ 1855 \ 1856 product(bool, ParallelRefProcEnabled, false, \ 1857 "Enable parallel reference processing whenever possible") \ 1858 \ 1859 product(bool, ParallelRefProcBalancingEnabled, true, \ 1860 "Enable balancing of reference processing queues") \ 1861 \ 1862 product(intx, CMSTriggerRatio, 80, \ 1863 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1864 "allocated before a CMS collection cycle commences") \ 1865 \ 1866 product(intx, CMSTriggerPermRatio, 80, \ 1867 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1868 "is allocated before a CMS collection cycle commences, that " \ 1869 "also collects the perm generation") \ 1870 \ 1871 product(uintx, CMSBootstrapOccupancy, 50, \ 1872 "Percentage CMS generation occupancy at which to " \ 1873 "initiate CMS collection for bootstrapping collection stats") \ 1874 \ 1875 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1876 "Percentage CMS generation occupancy to start a CMS collection " \ 1877 "cycle. A negative value means that CMSTriggerRatio is used") \ 1878 \ 1879 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1880 "Percentage of the (entire) heap occupancy to start a " \ 1881 "concurrent GC cycle. It us used by GCs that trigger a " \ 1882 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1883 "not just one of the generations (e.g., G1). A value of 0 " \ 1884 "denotes 'do constant GC cycles'.") \ 1885 \ 1886 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1887 "Percentage CMS perm generation occupancy to start a " \ 1888 "CMScollection cycle. A negative value means that " \ 1889 "CMSTriggerPermRatio is used") \ 1890 \ 1891 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1892 "Only use occupancy as a crierion for starting a CMS collection") \ 1893 \ 1894 product(intx, CMSIsTooFullPercentage, 98, \ 1895 "An absolute ceiling above which CMS will always consider the " \ 1896 "perm gen ripe for collection") \ 1897 \ 1898 develop(bool, CMSTestInFreeList, false, \ 1899 "Check if the coalesced range is already in the " \ 1900 "free lists as claimed") \ 1901 \ 1902 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1903 "Check that all the garbage collected was returned to the " \ 1904 "free lists.") \ 1905 \ 1906 notproduct(bool, ScavengeALot, false, \ 1907 "Force scavenge at every Nth exit from the runtime system " \ 1908 "(N=ScavengeALotInterval)") \ 1909 \ 1910 develop(bool, FullGCALot, false, \ 1911 "Force full gc at every Nth exit from the runtime system " \ 1912 "(N=FullGCALotInterval)") \ 1913 \ 1914 notproduct(bool, GCALotAtAllSafepoints, false, \ 1915 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1916 \ 1917 product(bool, PrintPromotionFailure, false, \ 1918 "Print additional diagnostic information following " \ 1919 " promotion failure") \ 1920 \ 1921 notproduct(bool, PromotionFailureALot, false, \ 1922 "Use promotion failure handling on every youngest generation " \ 1923 "collection") \ 1924 \ 1925 develop(uintx, PromotionFailureALotCount, 1000, \ 1926 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1927 "refill attempts (ParNew) or promotion attempts " \ 1928 "(other young collectors) ") \ 1929 \ 1930 develop(uintx, PromotionFailureALotInterval, 5, \ 1931 "Total collections between promotion failures alot") \ 1932 \ 1933 experimental(intx, WorkStealingSleepMillis, 1, \ 1934 "Sleep time when sleep is used for yields") \ 1935 \ 1936 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1937 "Number of yields before a sleep is done during workstealing") \ 1938 \ 1939 experimental(uintx, WorkStealingHardSpins, 4096, \ 1940 "Number of iterations in a spin loop between checks on " \ 1941 "time out of hard spin") \ 1942 \ 1943 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1944 "Ratio of hard spins to calls to yield") \ 1945 \ 1946 product(uintx, PreserveMarkStackSize, 1024, \ 1947 "Size for stack used in promotion failure handling") \ 1948 \ 1949 develop(uintx, ObjArrayMarkingStride, 512, \ 1950 "Number of ObjArray elements to push onto the marking stack" \ 1951 "before pushing a continuation entry") \ 1952 \ 1953 notproduct(bool, ExecuteInternalVMTests, false, \ 1954 "Enable execution of internal VM tests.") \ 1955 \ 1956 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1957 \ 1958 product_pd(bool, ResizeTLAB, \ 1959 "Dynamically resize tlab size for threads") \ 1960 \ 1961 product(bool, ZeroTLAB, false, \ 1962 "Zero out the newly created TLAB") \ 1963 \ 1964 product(bool, FastTLABRefill, true, \ 1965 "Use fast TLAB refill code") \ 1966 \ 1967 product(bool, PrintTLAB, false, \ 1968 "Print various TLAB related information") \ 1969 \ 1970 product(bool, TLABStats, true, \ 1971 "Print various TLAB related information") \ 1972 \ 1973 product(bool, PrintRevisitStats, false, \ 1974 "Print revisit (klass and MDO) stack related information") \ 1975 \ 1976 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 1977 "Enable LowMemoryProtection")) \ 1978 \ 1979 product_pd(bool, NeverActAsServerClassMachine, \ 1980 "Never act like a server-class machine") \ 1981 \ 1982 product(bool, AlwaysActAsServerClassMachine, false, \ 1983 "Always act like a server-class machine") \ 1984 \ 1985 product_pd(uint64_t, MaxRAM, \ 1986 "Real memory size (in bytes) used to set maximum heap size") \ 1987 \ 1988 product(uintx, ErgoHeapSizeLimit, 0, \ 1989 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1990 "MaxRAM / MaxRAMFraction") \ 1991 \ 1992 product(uintx, MaxRAMFraction, 4, \ 1993 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1994 "size") \ 1995 \ 1996 product(uintx, DefaultMaxRAMFraction, 4, \ 1997 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1998 "size; deprecated: to be renamed to MaxRAMFraction") \ 1999 \ 2000 product(uintx, MinRAMFraction, 2, \ 2001 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2002 "size on systems with small physical memory size") \ 2003 \ 2004 product(uintx, InitialRAMFraction, 64, \ 2005 "Fraction (1/n) of real memory used for initial heap size") \ 2006 \ 2007 product(bool, UseAutoGCSelectPolicy, false, \ 2008 "Use automatic collection selection policy") \ 2009 \ 2010 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2011 "Automatic GC selection pause threshhold in ms") \ 2012 \ 2013 product(bool, UseAdaptiveSizePolicy, true, \ 2014 "Use adaptive generation sizing policies") \ 2015 \ 2016 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2017 "Use adaptive survivor sizing policies") \ 2018 \ 2019 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2020 "Use adaptive young-old sizing policies at minor collections") \ 2021 \ 2022 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2023 "Use adaptive young-old sizing policies at major collections") \ 2024 \ 2025 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2026 "Use statistics from System.GC for adaptive size policy") \ 2027 \ 2028 product(bool, UseAdaptiveGCBoundary, false, \ 2029 "Allow young-old boundary to move") \ 2030 \ 2031 develop(bool, TraceAdaptiveGCBoundary, false, \ 2032 "Trace young-old boundary moves") \ 2033 \ 2034 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2035 "Resize the virtual spaces of the young or old generations") \ 2036 \ 2037 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2038 "Policy for changeing generation size for throughput goals") \ 2039 \ 2040 product(uintx, AdaptiveSizePausePolicy, 0, \ 2041 "Policy for changing generation size for pause goals") \ 2042 \ 2043 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2044 "Adjust tenured generation to achive a minor pause goal") \ 2045 \ 2046 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2047 "Adjust young generation to achive a major pause goal") \ 2048 \ 2049 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2050 "Number of steps where heuristics is used before data is used") \ 2051 \ 2052 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2053 "Number of collections before the adaptive sizing is started") \ 2054 \ 2055 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2056 "Collecton interval for printing information; zero => never") \ 2057 \ 2058 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2059 "Use adaptive minimum footprint as a goal") \ 2060 \ 2061 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2062 "Weight given to exponential resizing, between 0 and 100") \ 2063 \ 2064 product(uintx, AdaptiveTimeWeight, 25, \ 2065 "Weight given to time in adaptive policy, between 0 and 100") \ 2066 \ 2067 product(uintx, PausePadding, 1, \ 2068 "How much buffer to keep for pause time") \ 2069 \ 2070 product(uintx, PromotedPadding, 3, \ 2071 "How much buffer to keep for promotion failure") \ 2072 \ 2073 product(uintx, SurvivorPadding, 3, \ 2074 "How much buffer to keep for survivor overflow") \ 2075 \ 2076 product(uintx, AdaptivePermSizeWeight, 20, \ 2077 "Weight for perm gen exponential resizing, between 0 and 100") \ 2078 \ 2079 product(uintx, PermGenPadding, 3, \ 2080 "How much buffer to keep for perm gen sizing") \ 2081 \ 2082 product(uintx, ThresholdTolerance, 10, \ 2083 "Allowed collection cost difference between generations") \ 2084 \ 2085 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2086 "If collection costs are within margin, reduce both by full " \ 2087 "delta") \ 2088 \ 2089 product(uintx, YoungGenerationSizeIncrement, 20, \ 2090 "Adaptive size percentage change in young generation") \ 2091 \ 2092 product(uintx, YoungGenerationSizeSupplement, 80, \ 2093 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2094 \ 2095 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2096 "Decay factor to YoungedGenerationSizeSupplement") \ 2097 \ 2098 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2099 "Adaptive size percentage change in tenured generation") \ 2100 \ 2101 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2102 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2103 \ 2104 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2105 "Decay factor to TenuredGenerationSizeIncrement") \ 2106 \ 2107 product(uintx, MaxGCPauseMillis, max_uintx, \ 2108 "Adaptive size policy maximum GC pause time goal in msec, " \ 2109 "or (G1 Only) the max. GC time per MMU time slice") \ 2110 \ 2111 product(uintx, GCPauseIntervalMillis, 0, \ 2112 "Time slice for MMU specification") \ 2113 \ 2114 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2115 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2116 \ 2117 product(uintx, GCTimeRatio, 99, \ 2118 "Adaptive size policy application time to GC time ratio") \ 2119 \ 2120 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2121 "Adaptive size scale down factor for shrinking") \ 2122 \ 2123 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2124 "Adaptive size decays the major cost for long major intervals") \ 2125 \ 2126 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2127 "Time scale over which major costs decay") \ 2128 \ 2129 product(uintx, MinSurvivorRatio, 3, \ 2130 "Minimum ratio of young generation/survivor space size") \ 2131 \ 2132 product(uintx, InitialSurvivorRatio, 8, \ 2133 "Initial ratio of eden/survivor space size") \ 2134 \ 2135 product(uintx, BaseFootPrintEstimate, 256*M, \ 2136 "Estimate of footprint other than Java Heap") \ 2137 \ 2138 product(bool, UseGCOverheadLimit, true, \ 2139 "Use policy to limit of proportion of time spent in GC " \ 2140 "before an OutOfMemory error is thrown") \ 2141 \ 2142 product(uintx, GCTimeLimit, 98, \ 2143 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2144 "error is thrown (used with GCHeapFreeLimit)") \ 2145 \ 2146 product(uintx, GCHeapFreeLimit, 2, \ 2147 "Minimum percentage of free space after a full GC before an " \ 2148 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2149 \ 2150 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2151 "Number of consecutive collections before gc time limit fires") \ 2152 \ 2153 product(bool, PrintAdaptiveSizePolicy, false, \ 2154 "Print information about AdaptiveSizePolicy") \ 2155 \ 2156 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2157 "How far ahead to prefetch destination area (<= 0 means off)") \ 2158 \ 2159 product(intx, PrefetchScanIntervalInBytes, -1, \ 2160 "How far ahead to prefetch scan area (<= 0 means off)") \ 2161 \ 2162 product(intx, PrefetchFieldsAhead, -1, \ 2163 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2164 \ 2165 develop(bool, UsePrefetchQueue, true, \ 2166 "Use the prefetch queue during PS promotion") \ 2167 \ 2168 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2169 "Verify system before exiting") \ 2170 \ 2171 diagnostic(bool, VerifyBeforeGC, false, \ 2172 "Verify memory system before GC") \ 2173 \ 2174 diagnostic(bool, VerifyAfterGC, false, \ 2175 "Verify memory system after GC") \ 2176 \ 2177 diagnostic(bool, VerifyDuringGC, false, \ 2178 "Verify memory system during GC (between phases)") \ 2179 \ 2180 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2181 "Enable parallel memory system verification") \ 2182 \ 2183 diagnostic(bool, DeferInitialCardMark, false, \ 2184 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2185 "may arise from new_pre_store_barrier") \ 2186 \ 2187 diagnostic(bool, VerifyRememberedSets, false, \ 2188 "Verify GC remembered sets") \ 2189 \ 2190 diagnostic(bool, VerifyObjectStartArray, true, \ 2191 "Verify GC object start array if verify before/after") \ 2192 \ 2193 product(bool, DisableExplicitGC, false, \ 2194 "Tells whether calling System.gc() does a full GC") \ 2195 \ 2196 notproduct(bool, CheckMemoryInitialization, false, \ 2197 "Checks memory initialization") \ 2198 \ 2199 product(bool, CollectGen0First, false, \ 2200 "Collect youngest generation before each full GC") \ 2201 \ 2202 diagnostic(bool, BindCMSThreadToCPU, false, \ 2203 "Bind CMS Thread to CPU if possible") \ 2204 \ 2205 diagnostic(uintx, CPUForCMSThread, 0, \ 2206 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2207 \ 2208 product(bool, BindGCTaskThreadsToCPUs, false, \ 2209 "Bind GCTaskThreads to CPUs if possible") \ 2210 \ 2211 product(bool, UseGCTaskAffinity, false, \ 2212 "Use worker affinity when asking for GCTasks") \ 2213 \ 2214 product(uintx, ProcessDistributionStride, 4, \ 2215 "Stride through processors when distributing processes") \ 2216 \ 2217 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2218 "number of times the coordinator GC thread will sleep while " \ 2219 "yielding before giving up and resuming GC") \ 2220 \ 2221 product(uintx, CMSYieldSleepCount, 0, \ 2222 "number of times a GC thread (minus the coordinator) " \ 2223 "will sleep while yielding before giving up and resuming GC") \ 2224 \ 2225 /* gc tracing */ \ 2226 manageable(bool, PrintGC, false, \ 2227 "Print message at garbage collect") \ 2228 \ 2229 manageable(bool, PrintGCDetails, false, \ 2230 "Print more details at garbage collect") \ 2231 \ 2232 manageable(bool, PrintGCDateStamps, false, \ 2233 "Print date stamps at garbage collect") \ 2234 \ 2235 manageable(bool, PrintGCTimeStamps, false, \ 2236 "Print timestamps at garbage collect") \ 2237 \ 2238 product(bool, PrintGCTaskTimeStamps, false, \ 2239 "Print timestamps for individual gc worker thread tasks") \ 2240 \ 2241 develop(intx, ConcGCYieldTimeout, 0, \ 2242 "If non-zero, assert that GC threads yield within this # of ms.") \ 2243 \ 2244 notproduct(bool, TraceMarkSweep, false, \ 2245 "Trace mark sweep") \ 2246 \ 2247 product(bool, PrintReferenceGC, false, \ 2248 "Print times spent handling reference objects during GC " \ 2249 " (enabled only when PrintGCDetails)") \ 2250 \ 2251 develop(bool, TraceReferenceGC, false, \ 2252 "Trace handling of soft/weak/final/phantom references") \ 2253 \ 2254 develop(bool, TraceFinalizerRegistration, false, \ 2255 "Trace registration of final references") \ 2256 \ 2257 notproduct(bool, TraceScavenge, false, \ 2258 "Trace scavenge") \ 2259 \ 2260 product_rw(bool, TraceClassLoading, false, \ 2261 "Trace all classes loaded") \ 2262 \ 2263 product(bool, TraceClassLoadingPreorder, false, \ 2264 "Trace all classes loaded in order referenced (not loaded)") \ 2265 \ 2266 product_rw(bool, TraceClassUnloading, false, \ 2267 "Trace unloading of classes") \ 2268 \ 2269 product_rw(bool, TraceLoaderConstraints, false, \ 2270 "Trace loader constraints") \ 2271 \ 2272 product(bool, TraceGen0Time, false, \ 2273 "Trace accumulated time for Gen 0 collection") \ 2274 \ 2275 product(bool, TraceGen1Time, false, \ 2276 "Trace accumulated time for Gen 1 collection") \ 2277 \ 2278 product(bool, PrintTenuringDistribution, false, \ 2279 "Print tenuring age information") \ 2280 \ 2281 product_rw(bool, PrintHeapAtGC, false, \ 2282 "Print heap layout before and after each GC") \ 2283 \ 2284 product_rw(bool, PrintHeapAtGCExtended, false, \ 2285 "Prints extended information about the layout of the heap " \ 2286 "when -XX:+PrintHeapAtGC is set") \ 2287 \ 2288 product(bool, PrintHeapAtSIGBREAK, true, \ 2289 "Print heap layout in response to SIGBREAK") \ 2290 \ 2291 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2292 "Print a class histogram before any major stop-world GC") \ 2293 \ 2294 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2295 "Print a class histogram after any major stop-world GC") \ 2296 \ 2297 manageable(bool, PrintClassHistogram, false, \ 2298 "Print a histogram of class instances") \ 2299 \ 2300 develop(bool, TraceWorkGang, false, \ 2301 "Trace activities of work gangs") \ 2302 \ 2303 product(bool, TraceParallelOldGCTasks, false, \ 2304 "Trace multithreaded GC activity") \ 2305 \ 2306 develop(bool, TraceBlockOffsetTable, false, \ 2307 "Print BlockOffsetTable maps") \ 2308 \ 2309 develop(bool, TraceCardTableModRefBS, false, \ 2310 "Print CardTableModRefBS maps") \ 2311 \ 2312 develop(bool, TraceGCTaskManager, false, \ 2313 "Trace actions of the GC task manager") \ 2314 \ 2315 develop(bool, TraceGCTaskQueue, false, \ 2316 "Trace actions of the GC task queues") \ 2317 \ 2318 develop(bool, TraceGCTaskThread, false, \ 2319 "Trace actions of the GC task threads") \ 2320 \ 2321 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2322 "Print the time taken by each parallel old gc phase." \ 2323 "PrintGCDetails must also be enabled.") \ 2324 \ 2325 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2326 "Trace parallel old gc marking phase") \ 2327 \ 2328 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2329 "Trace parallel old gc summary phase") \ 2330 \ 2331 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2332 "Trace parallel old gc compaction phase") \ 2333 \ 2334 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2335 "Trace parallel old gc dense prefix computation") \ 2336 \ 2337 develop(bool, IgnoreLibthreadGPFault, false, \ 2338 "Suppress workaround for libthread GP fault") \ 2339 \ 2340 product(bool, PrintJNIGCStalls, false, \ 2341 "Print diagnostic message when GC is stalled" \ 2342 "by JNI critical section") \ 2343 \ 2344 /* GC log rotation setting */ \ 2345 \ 2346 product(bool, UseGCLogFileRotation, false, \ 2347 "Prevent large gclog file for long running app. " \ 2348 "Requires -Xloggc:<filename>") \ 2349 \ 2350 product(uintx, NumberOfGCLogFiles, 0, \ 2351 "Number of gclog files in rotation, " \ 2352 "Default: 0, no rotation") \ 2353 \ 2354 product(uintx, GCLogFileSize, 0, \ 2355 "GC log file size, Default: 0 bytes, no rotation " \ 2356 "Only valid with UseGCLogFileRotation") \ 2357 \ 2358 /* JVMTI heap profiling */ \ 2359 \ 2360 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2361 "Trace JVMTI object tagging calls") \ 2362 \ 2363 diagnostic(bool, VerifyBeforeIteration, false, \ 2364 "Verify memory system before JVMTI iteration") \ 2365 \ 2366 /* compiler interface */ \ 2367 \ 2368 develop(bool, CIPrintCompilerName, false, \ 2369 "when CIPrint is active, print the name of the active compiler") \ 2370 \ 2371 develop(bool, CIPrintCompileQueue, false, \ 2372 "display the contents of the compile queue whenever a " \ 2373 "compilation is enqueued") \ 2374 \ 2375 develop(bool, CIPrintRequests, false, \ 2376 "display every request for compilation") \ 2377 \ 2378 product(bool, CITime, false, \ 2379 "collect timing information for compilation") \ 2380 \ 2381 develop(bool, CITimeEach, false, \ 2382 "display timing information after each successful compilation") \ 2383 \ 2384 develop(bool, CICountOSR, true, \ 2385 "use a separate counter when assigning ids to osr compilations") \ 2386 \ 2387 develop(bool, CICompileNatives, true, \ 2388 "compile native methods if supported by the compiler") \ 2389 \ 2390 develop_pd(bool, CICompileOSR, \ 2391 "compile on stack replacement methods if supported by the " \ 2392 "compiler") \ 2393 \ 2394 develop(bool, CIPrintMethodCodes, false, \ 2395 "print method bytecodes of the compiled code") \ 2396 \ 2397 develop(bool, CIPrintTypeFlow, false, \ 2398 "print the results of ciTypeFlow analysis") \ 2399 \ 2400 develop(bool, CITraceTypeFlow, false, \ 2401 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2402 \ 2403 develop(intx, CICloneLoopTestLimit, 100, \ 2404 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2405 \ 2406 develop(intx, OSROnlyBCI, -1, \ 2407 "OSR only at this bci. Negative values mean exclude that bci") \ 2408 \ 2409 /* temp diagnostics */ \ 2410 \ 2411 diagnostic(bool, TraceRedundantCompiles, false, \ 2412 "Have compile broker print when a request already in the queue is"\ 2413 " requested again") \ 2414 \ 2415 diagnostic(bool, InitialCompileFast, false, \ 2416 "Initial compile at CompLevel_fast_compile") \ 2417 \ 2418 diagnostic(bool, InitialCompileReallyFast, false, \ 2419 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2420 \ 2421 diagnostic(bool, FullProfileOnReInterpret, true, \ 2422 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2423 \ 2424 /* compiler */ \ 2425 \ 2426 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2427 "Number of compiler threads to run") \ 2428 \ 2429 product(intx, CompilationPolicyChoice, 0, \ 2430 "which compilation policy (0/1)") \ 2431 \ 2432 develop(bool, UseStackBanging, true, \ 2433 "use stack banging for stack overflow checks (required for " \ 2434 "proper StackOverflow handling; disable only to measure cost " \ 2435 "of stackbanging)") \ 2436 \ 2437 develop(bool, Use24BitFPMode, true, \ 2438 "Set 24-bit FPU mode on a per-compile basis ") \ 2439 \ 2440 develop(bool, Use24BitFP, true, \ 2441 "use FP instructions that produce 24-bit precise results") \ 2442 \ 2443 develop(bool, UseStrictFP, true, \ 2444 "use strict fp if modifier strictfp is set") \ 2445 \ 2446 develop(bool, GenerateSynchronizationCode, true, \ 2447 "generate locking/unlocking code for synchronized methods and " \ 2448 "monitors") \ 2449 \ 2450 develop(bool, GenerateCompilerNullChecks, true, \ 2451 "Generate explicit null checks for loads/stores/calls") \ 2452 \ 2453 develop(bool, GenerateRangeChecks, true, \ 2454 "Generate range checks for array accesses") \ 2455 \ 2456 develop_pd(bool, ImplicitNullChecks, \ 2457 "generate code for implicit null checks") \ 2458 \ 2459 product(bool, PrintSafepointStatistics, false, \ 2460 "print statistics about safepoint synchronization") \ 2461 \ 2462 product(intx, PrintSafepointStatisticsCount, 300, \ 2463 "total number of safepoint statistics collected " \ 2464 "before printing them out") \ 2465 \ 2466 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2467 "print safepoint statistics only when safepoint takes" \ 2468 " more than PrintSafepointSatisticsTimeout in millis") \ 2469 \ 2470 product(bool, TraceSafepointCleanupTime, false, \ 2471 "print the break down of clean up tasks performed during" \ 2472 " safepoint") \ 2473 \ 2474 develop(bool, InlineAccessors, true, \ 2475 "inline accessor methods (get/set)") \ 2476 \ 2477 product(bool, Inline, true, \ 2478 "enable inlining") \ 2479 \ 2480 product(bool, ClipInlining, true, \ 2481 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2482 \ 2483 develop(bool, UseCHA, true, \ 2484 "enable CHA") \ 2485 \ 2486 product(bool, UseTypeProfile, true, \ 2487 "Check interpreter profile for historically monomorphic calls") \ 2488 \ 2489 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2490 "% of major receiver type to all profiled receivers") \ 2491 \ 2492 notproduct(bool, TimeCompiler, false, \ 2493 "time the compiler") \ 2494 \ 2495 notproduct(bool, TimeCompiler2, false, \ 2496 "detailed time the compiler (requires +TimeCompiler)") \ 2497 \ 2498 diagnostic(bool, PrintInlining, false, \ 2499 "prints inlining optimizations") \ 2500 \ 2501 diagnostic(bool, PrintIntrinsics, false, \ 2502 "prints attempted and successful inlining of intrinsics") \ 2503 \ 2504 product(bool, UseCountLeadingZerosInstruction, false, \ 2505 "Use count leading zeros instruction") \ 2506 \ 2507 product(bool, UsePopCountInstruction, false, \ 2508 "Use population count instruction") \ 2509 \ 2510 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2511 "do not expand intrinsics whose (internal) names appear here") \ 2512 \ 2513 develop(bool, StressReflectiveCode, false, \ 2514 "Use inexact types at allocations, etc., to test reflection") \ 2515 \ 2516 develop(bool, EagerInitialization, false, \ 2517 "Eagerly initialize classes if possible") \ 2518 \ 2519 develop(bool, TraceMethodReplacement, false, \ 2520 "Print when methods are replaced do to recompilation") \ 2521 \ 2522 develop(bool, PrintMethodFlushing, false, \ 2523 "print the nmethods being flushed") \ 2524 \ 2525 notproduct(bool, LogMultipleMutexLocking, false, \ 2526 "log locking and unlocking of mutexes (only if multiple locks " \ 2527 "are held)") \ 2528 \ 2529 develop(bool, UseRelocIndex, false, \ 2530 "use an index to speed random access to relocations") \ 2531 \ 2532 develop(bool, StressCodeBuffers, false, \ 2533 "Exercise code buffer expansion and other rare state changes") \ 2534 \ 2535 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2536 "Generate extra debugging info for non-safepoints in nmethods") \ 2537 \ 2538 diagnostic(bool, DebugInlinedCalls, true, \ 2539 "If false, restricts profiled locations to the root method only") \ 2540 \ 2541 product(bool, PrintVMOptions, trueInDebug, \ 2542 "Print flags that appeared on the command line") \ 2543 \ 2544 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2545 "Ignore unrecognized VM options") \ 2546 \ 2547 product(bool, PrintCommandLineFlags, false, \ 2548 "Print flags specified on command line or set by ergonomics") \ 2549 \ 2550 product(bool, PrintFlagsInitial, false, \ 2551 "Print all VM flags before argument processing and exit VM") \ 2552 \ 2553 product(bool, PrintFlagsFinal, false, \ 2554 "Print all VM flags after argument and ergonomic processing") \ 2555 \ 2556 notproduct(bool, PrintFlagsWithComments, false, \ 2557 "Print all VM flags with default values and descriptions and exit")\ 2558 \ 2559 diagnostic(bool, SerializeVMOutput, true, \ 2560 "Use a mutex to serialize output to tty and hotspot.log") \ 2561 \ 2562 diagnostic(bool, DisplayVMOutput, true, \ 2563 "Display all VM output on the tty, independently of LogVMOutput") \ 2564 \ 2565 diagnostic(bool, LogVMOutput, trueInDebug, \ 2566 "Save VM output to hotspot.log, or to LogFile") \ 2567 \ 2568 diagnostic(ccstr, LogFile, NULL, \ 2569 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2570 \ 2571 product(ccstr, ErrorFile, NULL, \ 2572 "If an error occurs, save the error data to this file " \ 2573 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2574 \ 2575 product(bool, DisplayVMOutputToStderr, false, \ 2576 "If DisplayVMOutput is true, display all VM output to stderr") \ 2577 \ 2578 product(bool, DisplayVMOutputToStdout, false, \ 2579 "If DisplayVMOutput is true, display all VM output to stdout") \ 2580 \ 2581 product(bool, UseHeavyMonitors, false, \ 2582 "use heavyweight instead of lightweight Java monitors") \ 2583 \ 2584 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2585 "print histogram of the symbol table") \ 2586 \ 2587 notproduct(bool, ExitVMOnVerifyError, false, \ 2588 "standard exit from VM if bytecode verify error " \ 2589 "(only in debug mode)") \ 2590 \ 2591 notproduct(ccstr, AbortVMOnException, NULL, \ 2592 "Call fatal if this exception is thrown. Example: " \ 2593 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2594 \ 2595 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2596 "Call fatal if the exception pointed by AbortVMOnException " \ 2597 "has this message.") \ 2598 \ 2599 develop(bool, DebugVtables, false, \ 2600 "add debugging code to vtable dispatch") \ 2601 \ 2602 develop(bool, PrintVtables, false, \ 2603 "print vtables when printing klass") \ 2604 \ 2605 notproduct(bool, PrintVtableStats, false, \ 2606 "print vtables stats at end of run") \ 2607 \ 2608 develop(bool, TraceCreateZombies, false, \ 2609 "trace creation of zombie nmethods") \ 2610 \ 2611 notproduct(bool, IgnoreLockingAssertions, false, \ 2612 "disable locking assertions (for speed)") \ 2613 \ 2614 notproduct(bool, VerifyLoopOptimizations, false, \ 2615 "verify major loop optimizations") \ 2616 \ 2617 product(bool, RangeCheckElimination, true, \ 2618 "Split loop iterations to eliminate range checks") \ 2619 \ 2620 develop_pd(bool, UncommonNullCast, \ 2621 "track occurrences of null in casts; adjust compiler tactics") \ 2622 \ 2623 develop(bool, TypeProfileCasts, true, \ 2624 "treat casts like calls for purposes of type profiling") \ 2625 \ 2626 develop(bool, MonomorphicArrayCheck, true, \ 2627 "Uncommon-trap array store checks that require full type check") \ 2628 \ 2629 diagnostic(bool, ProfileDynamicTypes, true, \ 2630 "do extra type profiling and use it more aggressively") \ 2631 \ 2632 develop(bool, DelayCompilationDuringStartup, true, \ 2633 "Delay invoking the compiler until main application class is " \ 2634 "loaded") \ 2635 \ 2636 develop(bool, CompileTheWorld, false, \ 2637 "Compile all methods in all classes in bootstrap class path " \ 2638 "(stress test)") \ 2639 \ 2640 develop(bool, CompileTheWorldPreloadClasses, true, \ 2641 "Preload all classes used by a class before start loading") \ 2642 \ 2643 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2644 "Force a safepoint every n compiles so sweeper can keep up") \ 2645 \ 2646 develop(bool, TraceIterativeGVN, false, \ 2647 "Print progress during Iterative Global Value Numbering") \ 2648 \ 2649 develop(bool, FillDelaySlots, true, \ 2650 "Fill delay slots (on SPARC only)") \ 2651 \ 2652 develop(bool, VerifyIterativeGVN, false, \ 2653 "Verify Def-Use modifications during sparse Iterative Global " \ 2654 "Value Numbering") \ 2655 \ 2656 notproduct(bool, TracePhaseCCP, false, \ 2657 "Print progress during Conditional Constant Propagation") \ 2658 \ 2659 develop(bool, TimeLivenessAnalysis, false, \ 2660 "Time computation of bytecode liveness analysis") \ 2661 \ 2662 develop(bool, TraceLivenessGen, false, \ 2663 "Trace the generation of liveness analysis information") \ 2664 \ 2665 notproduct(bool, TraceLivenessQuery, false, \ 2666 "Trace queries of liveness analysis information") \ 2667 \ 2668 notproduct(bool, CollectIndexSetStatistics, false, \ 2669 "Collect information about IndexSets") \ 2670 \ 2671 develop(bool, PrintDominators, false, \ 2672 "Print out dominator trees for GVN") \ 2673 \ 2674 develop(bool, UseLoopSafepoints, true, \ 2675 "Generate Safepoint nodes in every loop") \ 2676 \ 2677 notproduct(bool, TraceCISCSpill, false, \ 2678 "Trace allocators use of cisc spillable instructions") \ 2679 \ 2680 notproduct(bool, TraceSpilling, false, \ 2681 "Trace spilling") \ 2682 \ 2683 product(bool, SplitIfBlocks, true, \ 2684 "Clone compares and control flow through merge points to fold " \ 2685 "some branches") \ 2686 \ 2687 develop(intx, FastAllocateSizeLimit, 128*K, \ 2688 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2689 "Inline allocations larger than this in doublewords must go slow")\ 2690 \ 2691 product(bool, AggressiveOpts, false, \ 2692 "Enable aggressive optimizations - see arguments.cpp") \ 2693 \ 2694 product(bool, UseStringCache, false, \ 2695 "Enable String cache capabilities on String.java") \ 2696 \ 2697 /* statistics */ \ 2698 develop(bool, CountCompiledCalls, false, \ 2699 "counts method invocations") \ 2700 \ 2701 notproduct(bool, CountRuntimeCalls, false, \ 2702 "counts VM runtime calls") \ 2703 \ 2704 develop(bool, CountJNICalls, false, \ 2705 "counts jni method invocations") \ 2706 \ 2707 notproduct(bool, CountJVMCalls, false, \ 2708 "counts jvm method invocations") \ 2709 \ 2710 notproduct(bool, CountRemovableExceptions, false, \ 2711 "count exceptions that could be replaced by branches due to " \ 2712 "inlining") \ 2713 \ 2714 notproduct(bool, ICMissHistogram, false, \ 2715 "produce histogram of IC misses") \ 2716 \ 2717 notproduct(bool, PrintClassStatistics, false, \ 2718 "prints class statistics at end of run") \ 2719 \ 2720 notproduct(bool, PrintMethodStatistics, false, \ 2721 "prints method statistics at end of run") \ 2722 \ 2723 /* interpreter */ \ 2724 develop(bool, ClearInterpreterLocals, false, \ 2725 "Always clear local variables of interpreter activations upon " \ 2726 "entry") \ 2727 \ 2728 product_pd(bool, RewriteBytecodes, \ 2729 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2730 \ 2731 product_pd(bool, RewriteFrequentPairs, \ 2732 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2733 \ 2734 diagnostic(bool, PrintInterpreter, false, \ 2735 "Prints the generated interpreter code") \ 2736 \ 2737 product(bool, UseInterpreter, true, \ 2738 "Use interpreter for non-compiled methods") \ 2739 \ 2740 develop(bool, UseFastSignatureHandlers, true, \ 2741 "Use fast signature handlers for native calls") \ 2742 \ 2743 develop(bool, UseV8InstrsOnly, false, \ 2744 "Use SPARC-V8 Compliant instruction subset") \ 2745 \ 2746 product(bool, UseNiagaraInstrs, false, \ 2747 "Use Niagara-efficient instruction subset") \ 2748 \ 2749 develop(bool, UseCASForSwap, false, \ 2750 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2751 \ 2752 product(bool, UseLoopCounter, true, \ 2753 "Increment invocation counter on backward branch") \ 2754 \ 2755 product(bool, UseFastEmptyMethods, true, \ 2756 "Use fast method entry code for empty methods") \ 2757 \ 2758 product(bool, UseFastAccessorMethods, true, \ 2759 "Use fast method entry code for accessor methods") \ 2760 \ 2761 product_pd(bool, UseOnStackReplacement, \ 2762 "Use on stack replacement, calls runtime if invoc. counter " \ 2763 "overflows in loop") \ 2764 \ 2765 notproduct(bool, TraceOnStackReplacement, false, \ 2766 "Trace on stack replacement") \ 2767 \ 2768 develop(bool, PoisonOSREntry, true, \ 2769 "Detect abnormal calls to OSR code") \ 2770 \ 2771 product_pd(bool, PreferInterpreterNativeStubs, \ 2772 "Use always interpreter stubs for native methods invoked via " \ 2773 "interpreter") \ 2774 \ 2775 develop(bool, CountBytecodes, false, \ 2776 "Count number of bytecodes executed") \ 2777 \ 2778 develop(bool, PrintBytecodeHistogram, false, \ 2779 "Print histogram of the executed bytecodes") \ 2780 \ 2781 develop(bool, PrintBytecodePairHistogram, false, \ 2782 "Print histogram of the executed bytecode pairs") \ 2783 \ 2784 diagnostic(bool, PrintSignatureHandlers, false, \ 2785 "Print code generated for native method signature handlers") \ 2786 \ 2787 develop(bool, VerifyOops, false, \ 2788 "Do plausibility checks for oops") \ 2789 \ 2790 develop(bool, CheckUnhandledOops, false, \ 2791 "Check for unhandled oops in VM code") \ 2792 \ 2793 develop(bool, VerifyJNIFields, trueInDebug, \ 2794 "Verify jfieldIDs for instance fields") \ 2795 \ 2796 notproduct(bool, VerifyJNIEnvThread, false, \ 2797 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2798 "from JNI") \ 2799 \ 2800 develop(bool, VerifyFPU, false, \ 2801 "Verify FPU state (check for NaN's, etc.)") \ 2802 \ 2803 develop(bool, VerifyThread, false, \ 2804 "Watch the thread register for corruption (SPARC only)") \ 2805 \ 2806 develop(bool, VerifyActivationFrameSize, false, \ 2807 "Verify that activation frame didn't become smaller than its " \ 2808 "minimal size") \ 2809 \ 2810 develop(bool, TraceFrequencyInlining, false, \ 2811 "Trace frequency based inlining") \ 2812 \ 2813 notproduct(bool, TraceTypeProfile, false, \ 2814 "Trace type profile") \ 2815 \ 2816 develop_pd(bool, InlineIntrinsics, \ 2817 "Inline intrinsics that can be statically resolved") \ 2818 \ 2819 product_pd(bool, ProfileInterpreter, \ 2820 "Profile at the bytecode level during interpretation") \ 2821 \ 2822 develop_pd(bool, ProfileTraps, \ 2823 "Profile deoptimization traps at the bytecode level") \ 2824 \ 2825 product(intx, ProfileMaturityPercentage, 20, \ 2826 "number of method invocations/branches (expressed as % of " \ 2827 "CompileThreshold) before using the method's profile") \ 2828 \ 2829 develop(bool, PrintMethodData, false, \ 2830 "Print the results of +ProfileInterpreter at end of run") \ 2831 \ 2832 develop(bool, VerifyDataPointer, trueInDebug, \ 2833 "Verify the method data pointer during interpreter profiling") \ 2834 \ 2835 develop(bool, VerifyCompiledCode, false, \ 2836 "Include miscellaneous runtime verifications in nmethod code; " \ 2837 "default off because it disturbs nmethod size heuristics") \ 2838 \ 2839 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2840 "Manually make GC thread crash then dump java stack trace; " \ 2841 "Test only") \ 2842 \ 2843 /* compilation */ \ 2844 product(bool, UseCompiler, true, \ 2845 "use compilation") \ 2846 \ 2847 develop(bool, TraceCompilationPolicy, false, \ 2848 "Trace compilation policy") \ 2849 \ 2850 develop(bool, TimeCompilationPolicy, false, \ 2851 "Time the compilation policy") \ 2852 \ 2853 product(bool, UseCounterDecay, true, \ 2854 "adjust recompilation counters") \ 2855 \ 2856 develop(intx, CounterHalfLifeTime, 30, \ 2857 "half-life time of invocation counters (in secs)") \ 2858 \ 2859 develop(intx, CounterDecayMinIntervalLength, 500, \ 2860 "Min. ms. between invocation of CounterDecay") \ 2861 \ 2862 product(bool, AlwaysCompileLoopMethods, false, \ 2863 "when using recompilation, never interpret methods " \ 2864 "containing loops") \ 2865 \ 2866 product(bool, DontCompileHugeMethods, true, \ 2867 "don't compile methods > HugeMethodLimit") \ 2868 \ 2869 /* Bytecode escape analysis estimation. */ \ 2870 product(bool, EstimateArgEscape, true, \ 2871 "Analyze bytecodes to estimate escape state of arguments") \ 2872 \ 2873 product(intx, BCEATraceLevel, 0, \ 2874 "How much tracing to do of bytecode escape analysis estimates") \ 2875 \ 2876 product(intx, MaxBCEAEstimateLevel, 5, \ 2877 "Maximum number of nested calls that are analyzed by BC EA.") \ 2878 \ 2879 product(intx, MaxBCEAEstimateSize, 150, \ 2880 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2881 \ 2882 product(intx, AllocatePrefetchStyle, 1, \ 2883 "0 = no prefetch, " \ 2884 "1 = prefetch instructions for each allocation, " \ 2885 "2 = use TLAB watermark to gate allocation prefetch, " \ 2886 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2887 \ 2888 product(intx, AllocatePrefetchDistance, -1, \ 2889 "Distance to prefetch ahead of allocation pointer") \ 2890 \ 2891 product(intx, AllocatePrefetchLines, 1, \ 2892 "Number of lines to prefetch ahead of allocation pointer") \ 2893 \ 2894 product(intx, AllocatePrefetchStepSize, 16, \ 2895 "Step size in bytes of sequential prefetch instructions") \ 2896 \ 2897 product(intx, AllocatePrefetchInstr, 0, \ 2898 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2899 \ 2900 product(intx, ReadPrefetchInstr, 0, \ 2901 "Prefetch instruction to prefetch ahead") \ 2902 \ 2903 /* deoptimization */ \ 2904 develop(bool, TraceDeoptimization, false, \ 2905 "Trace deoptimization") \ 2906 \ 2907 develop(bool, DebugDeoptimization, false, \ 2908 "Tracing various information while debugging deoptimization") \ 2909 \ 2910 product(intx, SelfDestructTimer, 0, \ 2911 "Will cause VM to terminate after a given time (in minutes) " \ 2912 "(0 means off)") \ 2913 \ 2914 product(intx, MaxJavaStackTraceDepth, 1024, \ 2915 "Max. no. of lines in the stack trace for Java exceptions " \ 2916 "(0 means all)") \ 2917 \ 2918 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2919 "Guarantee a safepoint (at least) every so many milliseconds " \ 2920 "(0 means none)")) \ 2921 \ 2922 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2923 "Guarantee a safepoint (at least) every so many milliseconds " \ 2924 "(0 means none)")) \ 2925 \ 2926 product(intx, SafepointTimeoutDelay, 10000, \ 2927 "Delay in milliseconds for option SafepointTimeout") \ 2928 \ 2929 product(intx, NmethodSweepFraction, 4, \ 2930 "Number of invocations of sweeper to cover all nmethods") \ 2931 \ 2932 product(intx, NmethodSweepCheckInterval, 5, \ 2933 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2934 \ 2935 notproduct(bool, LogSweeper, false, \ 2936 "Keep a ring buffer of sweeper activity") \ 2937 \ 2938 notproduct(intx, SweeperLogEntries, 1024, \ 2939 "Number of records in the ring buffer of sweeper activity") \ 2940 \ 2941 notproduct(intx, MemProfilingInterval, 500, \ 2942 "Time between each invocation of the MemProfiler") \ 2943 \ 2944 develop(intx, MallocCatchPtr, -1, \ 2945 "Hit breakpoint when mallocing/freeing this pointer") \ 2946 \ 2947 notproduct(intx, AssertRepeat, 1, \ 2948 "number of times to evaluate expression in assert " \ 2949 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2950 \ 2951 notproduct(ccstrlist, SuppressErrorAt, "", \ 2952 "List of assertions (file:line) to muzzle") \ 2953 \ 2954 notproduct(uintx, HandleAllocationLimit, 1024, \ 2955 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2956 "is used") \ 2957 \ 2958 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2959 "Threshold for total handle allocation when " \ 2960 "+TraceHandleAllocation is used") \ 2961 \ 2962 develop(intx, StackPrintLimit, 100, \ 2963 "number of stack frames to print in VM-level stack dump") \ 2964 \ 2965 notproduct(intx, MaxElementPrintSize, 256, \ 2966 "maximum number of elements to print") \ 2967 \ 2968 notproduct(intx, MaxSubklassPrintSize, 4, \ 2969 "maximum number of subklasses to print when printing klass") \ 2970 \ 2971 product(intx, MaxInlineLevel, 9, \ 2972 "maximum number of nested calls that are inlined") \ 2973 \ 2974 product(intx, MaxRecursiveInlineLevel, 1, \ 2975 "maximum number of nested recursive calls that are inlined") \ 2976 \ 2977 product_pd(intx, InlineSmallCode, \ 2978 "Only inline already compiled methods if their code size is " \ 2979 "less than this") \ 2980 \ 2981 product(intx, MaxInlineSize, 35, \ 2982 "maximum bytecode size of a method to be inlined") \ 2983 \ 2984 product_pd(intx, FreqInlineSize, \ 2985 "maximum bytecode size of a frequent method to be inlined") \ 2986 \ 2987 product(intx, MaxTrivialSize, 6, \ 2988 "maximum bytecode size of a trivial method to be inlined") \ 2989 \ 2990 product(intx, MinInliningThreshold, 250, \ 2991 "min. invocation count a method needs to have to be inlined") \ 2992 \ 2993 develop(intx, AlignEntryCode, 4, \ 2994 "aligns entry code to specified value (in bytes)") \ 2995 \ 2996 develop(intx, MethodHistogramCutoff, 100, \ 2997 "cutoff value for method invoc. histogram (+CountCalls)") \ 2998 \ 2999 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3000 "# of interpreted methods to show in profile") \ 3001 \ 3002 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3003 "# of compiled methods to show in profile") \ 3004 \ 3005 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3006 "# of stub methods to show in profile") \ 3007 \ 3008 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3009 "# of runtime stub nodes to show in profile") \ 3010 \ 3011 product(intx, ProfileIntervalsTicks, 100, \ 3012 "# of ticks between printing of interval profile " \ 3013 "(+ProfileIntervals)") \ 3014 \ 3015 notproduct(intx, ScavengeALotInterval, 1, \ 3016 "Interval between which scavenge will occur with +ScavengeALot") \ 3017 \ 3018 notproduct(intx, FullGCALotInterval, 1, \ 3019 "Interval between which full gc will occur with +FullGCALot") \ 3020 \ 3021 notproduct(intx, FullGCALotStart, 0, \ 3022 "For which invocation to start FullGCAlot") \ 3023 \ 3024 notproduct(intx, FullGCALotDummies, 32*K, \ 3025 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3026 "to move") \ 3027 \ 3028 develop(intx, DontYieldALotInterval, 10, \ 3029 "Interval between which yields will be dropped (milliseconds)") \ 3030 \ 3031 develop(intx, MinSleepInterval, 1, \ 3032 "Minimum sleep() interval (milliseconds) when " \ 3033 "ConvertSleepToYield is off (used for SOLARIS)") \ 3034 \ 3035 product(intx, EventLogLength, 2000, \ 3036 "maximum nof events in event log") \ 3037 \ 3038 develop(intx, ProfilerPCTickThreshold, 15, \ 3039 "Number of ticks in a PC buckets to be a hotspot") \ 3040 \ 3041 notproduct(intx, DeoptimizeALotInterval, 5, \ 3042 "Number of exits until DeoptimizeALot kicks in") \ 3043 \ 3044 notproduct(intx, ZombieALotInterval, 5, \ 3045 "Number of exits until ZombieALot kicks in") \ 3046 \ 3047 develop(bool, StressNonEntrant, false, \ 3048 "Mark nmethods non-entrant at registration") \ 3049 \ 3050 diagnostic(intx, MallocVerifyInterval, 0, \ 3051 "if non-zero, verify C heap after every N calls to " \ 3052 "malloc/realloc/free") \ 3053 \ 3054 diagnostic(intx, MallocVerifyStart, 0, \ 3055 "if non-zero, start verifying C heap after Nth call to " \ 3056 "malloc/realloc/free") \ 3057 \ 3058 product(intx, TypeProfileWidth, 2, \ 3059 "number of receiver types to record in call/cast profile") \ 3060 \ 3061 develop(intx, BciProfileWidth, 2, \ 3062 "number of return bci's to record in ret profile") \ 3063 \ 3064 product(intx, PerMethodRecompilationCutoff, 400, \ 3065 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3066 \ 3067 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3068 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3069 \ 3070 product(intx, PerMethodTrapLimit, 100, \ 3071 "Limit on traps (of one kind) in a method (includes inlines)") \ 3072 \ 3073 product(intx, PerBytecodeTrapLimit, 4, \ 3074 "Limit on traps (of one kind) at a particular BCI") \ 3075 \ 3076 develop(intx, FreqCountInvocations, 1, \ 3077 "Scaling factor for branch frequencies (deprecated)") \ 3078 \ 3079 develop(intx, InlineFrequencyRatio, 20, \ 3080 "Ratio of call site execution to caller method invocation") \ 3081 \ 3082 develop_pd(intx, InlineFrequencyCount, \ 3083 "Count of call site execution necessary to trigger frequent " \ 3084 "inlining") \ 3085 \ 3086 develop(intx, InlineThrowCount, 50, \ 3087 "Force inlining of interpreted methods that throw this often") \ 3088 \ 3089 develop(intx, InlineThrowMaxSize, 200, \ 3090 "Force inlining of throwing methods smaller than this") \ 3091 \ 3092 product(intx, AliasLevel, 3, \ 3093 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3094 "2 for class split, 3 for unique instances") \ 3095 \ 3096 develop(bool, VerifyAliases, false, \ 3097 "perform extra checks on the results of alias analysis") \ 3098 \ 3099 develop(intx, ProfilerNodeSize, 1024, \ 3100 "Size in K to allocate for the Profile Nodes of each thread") \ 3101 \ 3102 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3103 "Number of times to spin wait on a v8 atomic operation lock") \ 3104 \ 3105 product(intx, ReadSpinIterations, 100, \ 3106 "Number of read attempts before a yield (spin inner loop)") \ 3107 \ 3108 product_pd(intx, PreInflateSpin, \ 3109 "Number of times to spin wait before inflation") \ 3110 \ 3111 product(intx, PreBlockSpin, 10, \ 3112 "Number of times to spin in an inflated lock before going to " \ 3113 "an OS lock") \ 3114 \ 3115 /* gc parameters */ \ 3116 product(uintx, InitialHeapSize, 0, \ 3117 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3118 \ 3119 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3120 "Maximum heap size (in bytes)") \ 3121 \ 3122 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3123 "Initial tenured generation size (in bytes)") \ 3124 \ 3125 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3126 "Initial new generation size (in bytes)") \ 3127 \ 3128 product(uintx, MaxNewSize, max_uintx, \ 3129 "Maximum new generation size (in bytes), max_uintx means set " \ 3130 "ergonomically") \ 3131 \ 3132 product(uintx, PretenureSizeThreshold, 0, \ 3133 "Maximum size in bytes of objects allocated in DefNew " \ 3134 "generation; zero means no maximum") \ 3135 \ 3136 product(uintx, TLABSize, 0, \ 3137 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3138 \ 3139 product(uintx, MinTLABSize, 2*K, \ 3140 "Minimum allowed TLAB size (in bytes)") \ 3141 \ 3142 product(uintx, TLABAllocationWeight, 35, \ 3143 "Allocation averaging weight") \ 3144 \ 3145 product(uintx, TLABWasteTargetPercent, 1, \ 3146 "Percentage of Eden that can be wasted") \ 3147 \ 3148 product(uintx, TLABRefillWasteFraction, 64, \ 3149 "Max TLAB waste at a refill (internal fragmentation)") \ 3150 \ 3151 product(uintx, TLABWasteIncrement, 4, \ 3152 "Increment allowed waste at slow allocation") \ 3153 \ 3154 product(intx, SurvivorRatio, 8, \ 3155 "Ratio of eden/survivor space size") \ 3156 \ 3157 product(intx, NewRatio, 2, \ 3158 "Ratio of new/old generation sizes") \ 3159 \ 3160 product_pd(uintx, NewSizeThreadIncrease, \ 3161 "Additional size added to desired new generation size per " \ 3162 "non-daemon thread (in bytes)") \ 3163 \ 3164 product_pd(uintx, PermSize, \ 3165 "Initial size of permanent generation (in bytes)") \ 3166 \ 3167 product_pd(uintx, MaxPermSize, \ 3168 "Maximum size of permanent generation (in bytes)") \ 3169 \ 3170 product(uintx, MinHeapFreeRatio, 40, \ 3171 "Min percentage of heap free after GC to avoid expansion") \ 3172 \ 3173 product(uintx, MaxHeapFreeRatio, 70, \ 3174 "Max percentage of heap free after GC to avoid shrinking") \ 3175 \ 3176 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3177 "Number of milliseconds per MB of free space in the heap") \ 3178 \ 3179 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3180 "Min change in heap space due to GC (in bytes)") \ 3181 \ 3182 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3183 "Min expansion of permanent heap (in bytes)") \ 3184 \ 3185 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3186 "Max expansion of permanent heap without full GC (in bytes)") \ 3187 \ 3188 product(intx, QueuedAllocationWarningCount, 0, \ 3189 "Number of times an allocation that queues behind a GC " \ 3190 "will retry before printing a warning") \ 3191 \ 3192 diagnostic(uintx, VerifyGCStartAt, 0, \ 3193 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3194 \ 3195 diagnostic(intx, VerifyGCLevel, 0, \ 3196 "Generation level at which to start +VerifyBefore/AfterGC") \ 3197 \ 3198 develop(uintx, ExitAfterGCNum, 0, \ 3199 "If non-zero, exit after this GC.") \ 3200 \ 3201 product(intx, MaxTenuringThreshold, 15, \ 3202 "Maximum value for tenuring threshold") \ 3203 \ 3204 product(intx, InitialTenuringThreshold, 7, \ 3205 "Initial value for tenuring threshold") \ 3206 \ 3207 product(intx, TargetSurvivorRatio, 50, \ 3208 "Desired percentage of survivor space used after scavenge") \ 3209 \ 3210 product(uintx, MarkSweepDeadRatio, 5, \ 3211 "Percentage (0-100) of the old gen allowed as dead wood." \ 3212 "Serial mark sweep treats this as both the min and max value." \ 3213 "CMS uses this value only if it falls back to mark sweep." \ 3214 "Par compact uses a variable scale based on the density of the" \ 3215 "generation and treats this as the max value when the heap is" \ 3216 "either completely full or completely empty. Par compact also" \ 3217 "has a smaller default value; see arguments.cpp.") \ 3218 \ 3219 product(uintx, PermMarkSweepDeadRatio, 20, \ 3220 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3221 "See MarkSweepDeadRatio for collector-specific comments.") \ 3222 \ 3223 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3224 "How often should we fully compact the heap (ignoring the dead " \ 3225 "space parameters)") \ 3226 \ 3227 product(intx, PrintCMSStatistics, 0, \ 3228 "Statistics for CMS") \ 3229 \ 3230 product(bool, PrintCMSInitiationStatistics, false, \ 3231 "Statistics for initiating a CMS collection") \ 3232 \ 3233 product(intx, PrintFLSStatistics, 0, \ 3234 "Statistics for CMS' FreeListSpace") \ 3235 \ 3236 product(intx, PrintFLSCensus, 0, \ 3237 "Census for CMS' FreeListSpace") \ 3238 \ 3239 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3240 "Delay in ms between expansion and allocation") \ 3241 \ 3242 product(intx, DeferThrSuspendLoopCount, 4000, \ 3243 "(Unstable) Number of times to iterate in safepoint loop " \ 3244 " before blocking VM threads ") \ 3245 \ 3246 product(intx, DeferPollingPageLoopCount, -1, \ 3247 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3248 "before changing safepoint polling page to RO ") \ 3249 \ 3250 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3251 \ 3252 product(bool, PSChunkLargeArrays, true, \ 3253 "true: process large arrays in chunks") \ 3254 \ 3255 product(uintx, GCDrainStackTargetSize, 64, \ 3256 "how many entries we'll try to leave on the stack during " \ 3257 "parallel GC") \ 3258 \ 3259 /* stack parameters */ \ 3260 product_pd(intx, StackYellowPages, \ 3261 "Number of yellow zone (recoverable overflows) pages") \ 3262 \ 3263 product_pd(intx, StackRedPages, \ 3264 "Number of red zone (unrecoverable overflows) pages") \ 3265 \ 3266 product_pd(intx, StackShadowPages, \ 3267 "Number of shadow zone (for overflow checking) pages" \ 3268 " this should exceed the depth of the VM and native call stack") \ 3269 \ 3270 product_pd(intx, ThreadStackSize, \ 3271 "Thread Stack Size (in Kbytes)") \ 3272 \ 3273 product_pd(intx, VMThreadStackSize, \ 3274 "Non-Java Thread Stack Size (in Kbytes)") \ 3275 \ 3276 product_pd(intx, CompilerThreadStackSize, \ 3277 "Compiler Thread Stack Size (in Kbytes)") \ 3278 \ 3279 develop_pd(uintx, JVMInvokeMethodSlack, \ 3280 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3281 \ 3282 product(uintx, ThreadSafetyMargin, 50*M, \ 3283 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3284 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3285 "disable this feature") \ 3286 \ 3287 /* code cache parameters */ \ 3288 develop(uintx, CodeCacheSegmentSize, 64, \ 3289 "Code cache segment size (in bytes) - smallest unit of " \ 3290 "allocation") \ 3291 \ 3292 develop_pd(intx, CodeEntryAlignment, \ 3293 "Code entry alignment for generated code (in bytes)") \ 3294 \ 3295 product_pd(intx, OptoLoopAlignment, \ 3296 "Align inner loops to zero relative to this modulus") \ 3297 \ 3298 product_pd(uintx, InitialCodeCacheSize, \ 3299 "Initial code cache size (in bytes)") \ 3300 \ 3301 product_pd(uintx, ReservedCodeCacheSize, \ 3302 "Reserved code cache size (in bytes) - maximum code cache size") \ 3303 \ 3304 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3305 "When less than X space left, we stop compiling.") \ 3306 \ 3307 product_pd(uintx, CodeCacheExpansionSize, \ 3308 "Code cache expansion size (in bytes)") \ 3309 \ 3310 develop_pd(uintx, CodeCacheMinBlockLength, \ 3311 "Minimum number of segments in a code cache block.") \ 3312 \ 3313 notproduct(bool, ExitOnFullCodeCache, false, \ 3314 "Exit the VM if we fill the code cache.") \ 3315 \ 3316 product(bool, UseCodeCacheFlushing, false, \ 3317 "Attempt to clean the code cache before shutting off compiler") \ 3318 \ 3319 product(intx, MinCodeCacheFlushingInterval, 30, \ 3320 "Min number of seconds between code cache cleaning sessions") \ 3321 \ 3322 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3323 "When less than X space left, start code cache cleaning") \ 3324 \ 3325 /* interpreter debugging */ \ 3326 develop(intx, BinarySwitchThreshold, 5, \ 3327 "Minimal number of lookupswitch entries for rewriting to binary " \ 3328 "switch") \ 3329 \ 3330 develop(intx, StopInterpreterAt, 0, \ 3331 "Stops interpreter execution at specified bytecode number") \ 3332 \ 3333 develop(intx, TraceBytecodesAt, 0, \ 3334 "Traces bytecodes starting with specified bytecode number") \ 3335 \ 3336 /* compiler interface */ \ 3337 develop(intx, CIStart, 0, \ 3338 "the id of the first compilation to permit") \ 3339 \ 3340 develop(intx, CIStop, -1, \ 3341 "the id of the last compilation to permit") \ 3342 \ 3343 develop(intx, CIStartOSR, 0, \ 3344 "the id of the first osr compilation to permit " \ 3345 "(CICountOSR must be on)") \ 3346 \ 3347 develop(intx, CIStopOSR, -1, \ 3348 "the id of the last osr compilation to permit " \ 3349 "(CICountOSR must be on)") \ 3350 \ 3351 develop(intx, CIBreakAtOSR, -1, \ 3352 "id of osr compilation to break at") \ 3353 \ 3354 develop(intx, CIBreakAt, -1, \ 3355 "id of compilation to break at") \ 3356 \ 3357 product(ccstrlist, CompileOnly, "", \ 3358 "List of methods (pkg/class.name) to restrict compilation to") \ 3359 \ 3360 product(ccstr, CompileCommandFile, NULL, \ 3361 "Read compiler commands from this file [.hotspot_compiler]") \ 3362 \ 3363 product(ccstrlist, CompileCommand, "", \ 3364 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3365 \ 3366 product(bool, CICompilerCountPerCPU, false, \ 3367 "1 compiler thread for log(N CPUs)") \ 3368 \ 3369 develop(intx, CIFireOOMAt, -1, \ 3370 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3371 "(non-negative value throws OOM after this many CI accesses " \ 3372 "in each compile)") \ 3373 \ 3374 develop(intx, CIFireOOMAtDelay, -1, \ 3375 "Wait for this many CI accesses to occur in all compiles before " \ 3376 "beginning to throw OutOfMemoryErrors in each compile") \ 3377 \ 3378 notproduct(bool, CIObjectFactoryVerify, false, \ 3379 "enable potentially expensive verification in ciObjectFactory") \ 3380 \ 3381 /* Priorities */ \ 3382 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3383 \ 3384 product(intx, ThreadPriorityPolicy, 0, \ 3385 "0 : Normal. "\ 3386 " VM chooses priorities that are appropriate for normal "\ 3387 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3388 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3389 " map to lower native priority values. On Windows applications"\ 3390 " are allowed to use higher native priorities. However, with "\ 3391 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3392 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3393 " interfere with system threads. On Linux thread priorities "\ 3394 " are ignored because the OS does not support static priority "\ 3395 " in SCHED_OTHER scheduling class which is the only choice for"\ 3396 " non-root, non-realtime applications. "\ 3397 "1 : Aggressive. "\ 3398 " Java thread priorities map over to the entire range of "\ 3399 " native thread priorities. Higher Java thread priorities map "\ 3400 " to higher native thread priorities. This policy should be "\ 3401 " used with care, as sometimes it can cause performance "\ 3402 " degradation in the application and/or the entire system. On "\ 3403 " Linux this policy requires root privilege.") \ 3404 \ 3405 product(bool, ThreadPriorityVerbose, false, \ 3406 "print priority changes") \ 3407 \ 3408 product(intx, DefaultThreadPriority, -1, \ 3409 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3410 \ 3411 product(intx, CompilerThreadPriority, -1, \ 3412 "what priority should compiler threads run at (-1 means no change)") \ 3413 \ 3414 product(intx, VMThreadPriority, -1, \ 3415 "what priority should VM threads run at (-1 means no change)") \ 3416 \ 3417 product(bool, CompilerThreadHintNoPreempt, true, \ 3418 "(Solaris only) Give compiler threads an extra quanta") \ 3419 \ 3420 product(bool, VMThreadHintNoPreempt, false, \ 3421 "(Solaris only) Give VM thread an extra quanta") \ 3422 \ 3423 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3424 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3425 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3426 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3427 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3428 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3429 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3430 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3431 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3432 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3433 \ 3434 /* compiler debugging */ \ 3435 notproduct(intx, CompileTheWorldStartAt, 1, \ 3436 "First class to consider when using +CompileTheWorld") \ 3437 \ 3438 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3439 "Last class to consider when using +CompileTheWorld") \ 3440 \ 3441 develop(intx, NewCodeParameter, 0, \ 3442 "Testing Only: Create a dedicated integer parameter before " \ 3443 "putback") \ 3444 \ 3445 /* new oopmap storage allocation */ \ 3446 develop(intx, MinOopMapAllocation, 8, \ 3447 "Minimum number of OopMap entries in an OopMapSet") \ 3448 \ 3449 /* Background Compilation */ \ 3450 develop(intx, LongCompileThreshold, 50, \ 3451 "Used with +TraceLongCompiles") \ 3452 \ 3453 product(intx, StarvationMonitorInterval, 200, \ 3454 "Pause between each check in ms") \ 3455 \ 3456 /* recompilation */ \ 3457 product_pd(intx, CompileThreshold, \ 3458 "number of interpreted method invocations before (re-)compiling") \ 3459 \ 3460 product_pd(intx, BackEdgeThreshold, \ 3461 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3462 \ 3463 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3464 "Interpreter (tier 0) invocation notification frequency.") \ 3465 \ 3466 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3467 "C1 without MDO (tier 2) invocation notification frequency.") \ 3468 \ 3469 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3470 "C1 with MDO profiling (tier 3) invocation notification " \ 3471 "frequency.") \ 3472 \ 3473 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3474 "Interpreter (tier 0) invocation notification frequency.") \ 3475 \ 3476 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3477 "C1 without MDO (tier 2) invocation notification frequency.") \ 3478 \ 3479 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3480 "C1 with MDO profiling (tier 3) invocation notification " \ 3481 "frequency.") \ 3482 \ 3483 product(intx, Tier2CompileThreshold, 0, \ 3484 "threshold at which tier 2 compilation is invoked") \ 3485 \ 3486 product(intx, Tier2BackEdgeThreshold, 0, \ 3487 "Back edge threshold at which tier 2 compilation is invoked") \ 3488 \ 3489 product(intx, Tier3InvocationThreshold, 200, \ 3490 "Compile if number of method invocations crosses this " \ 3491 "threshold") \ 3492 \ 3493 product(intx, Tier3MinInvocationThreshold, 100, \ 3494 "Minimum invocation to compile at tier 3") \ 3495 \ 3496 product(intx, Tier3CompileThreshold, 2000, \ 3497 "Threshold at which tier 3 compilation is invoked (invocation " \ 3498 "minimum must be satisfied.") \ 3499 \ 3500 product(intx, Tier3BackEdgeThreshold, 7000, \ 3501 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3502 \ 3503 product(intx, Tier4InvocationThreshold, 5000, \ 3504 "Compile if number of method invocations crosses this " \ 3505 "threshold") \ 3506 \ 3507 product(intx, Tier4MinInvocationThreshold, 600, \ 3508 "Minimum invocation to compile at tier 4") \ 3509 \ 3510 product(intx, Tier4CompileThreshold, 15000, \ 3511 "Threshold at which tier 4 compilation is invoked (invocation " \ 3512 "minimum must be satisfied.") \ 3513 \ 3514 product(intx, Tier4BackEdgeThreshold, 40000, \ 3515 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3516 \ 3517 product(intx, Tier3DelayOn, 5, \ 3518 "If C2 queue size grows over this amount per compiler thread " \ 3519 "stop compiling at tier 3 and start compiling at tier 2") \ 3520 \ 3521 product(intx, Tier3DelayOff, 2, \ 3522 "If C2 queue size is less than this amount per compiler thread " \ 3523 "allow methods compiled at tier 2 transition to tier 3") \ 3524 \ 3525 product(intx, Tier3LoadFeedback, 5, \ 3526 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3527 "reaches this amount per compiler thread") \ 3528 \ 3529 product(intx, Tier4LoadFeedback, 3, \ 3530 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3531 "reaches this amount per compiler thread") \ 3532 \ 3533 product(intx, TieredCompileTaskTimeout, 50, \ 3534 "Kill compile task if method was not used within " \ 3535 "given timeout in milliseconds") \ 3536 \ 3537 product(intx, TieredStopAtLevel, 4, \ 3538 "Stop at given compilation level") \ 3539 \ 3540 product(intx, Tier0ProfilingStartPercentage, 200, \ 3541 "Start profiling in interpreter if the counters exceed tier 3" \ 3542 "thresholds by the specified percentage") \ 3543 \ 3544 product(intx, TieredRateUpdateMinTime, 1, \ 3545 "Minimum rate sampling interval (in milliseconds)") \ 3546 \ 3547 product(intx, TieredRateUpdateMaxTime, 25, \ 3548 "Maximum rate sampling interval (in milliseconds)") \ 3549 \ 3550 product_pd(bool, TieredCompilation, \ 3551 "Enable tiered compilation") \ 3552 \ 3553 product(bool, PrintTieredEvents, false, \ 3554 "Print tiered events notifications") \ 3555 \ 3556 product(bool, StressTieredRuntime, false, \ 3557 "Alternate client and server compiler on compile requests") \ 3558 \ 3559 product_pd(intx, OnStackReplacePercentage, \ 3560 "NON_TIERED number of method invocations/branches (expressed as %"\ 3561 "of CompileThreshold) before (re-)compiling OSR code") \ 3562 \ 3563 product(intx, InterpreterProfilePercentage, 33, \ 3564 "NON_TIERED number of method invocations/branches (expressed as %"\ 3565 "of CompileThreshold) before profiling in the interpreter") \ 3566 \ 3567 develop(intx, MaxRecompilationSearchLength, 10, \ 3568 "max. # frames to inspect searching for recompilee") \ 3569 \ 3570 develop(intx, MaxInterpretedSearchLength, 3, \ 3571 "max. # interp. frames to skip when searching for recompilee") \ 3572 \ 3573 develop(intx, DesiredMethodLimit, 8000, \ 3574 "desired max. method size (in bytecodes) after inlining") \ 3575 \ 3576 develop(intx, HugeMethodLimit, 8000, \ 3577 "don't compile methods larger than this if " \ 3578 "+DontCompileHugeMethods") \ 3579 \ 3580 /* New JDK 1.4 reflection implementation */ \ 3581 \ 3582 develop(bool, UseNewReflection, true, \ 3583 "Temporary flag for transition to reflection based on dynamic " \ 3584 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3585 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3586 "changes were needed") \ 3587 \ 3588 develop(bool, VerifyReflectionBytecodes, false, \ 3589 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3590 "in situations like that described in 4486457 or for " \ 3591 "constructors generated for serialization, so can not be enabled "\ 3592 "in product.") \ 3593 \ 3594 product(bool, ReflectionWrapResolutionErrors, true, \ 3595 "Temporary flag for transition to AbstractMethodError wrapped " \ 3596 "in InvocationTargetException. See 6531596") \ 3597 \ 3598 \ 3599 develop(intx, FastSuperclassLimit, 8, \ 3600 "Depth of hardwired instanceof accelerator array") \ 3601 \ 3602 /* Properties for Java libraries */ \ 3603 \ 3604 product(intx, MaxDirectMemorySize, -1, \ 3605 "Maximum total size of NIO direct-buffer allocations") \ 3606 \ 3607 /* temporary developer defined flags */ \ 3608 \ 3609 diagnostic(bool, UseNewCode, false, \ 3610 "Testing Only: Use the new version while testing") \ 3611 \ 3612 diagnostic(bool, UseNewCode2, false, \ 3613 "Testing Only: Use the new version while testing") \ 3614 \ 3615 diagnostic(bool, UseNewCode3, false, \ 3616 "Testing Only: Use the new version while testing") \ 3617 \ 3618 /* flags for performance data collection */ \ 3619 \ 3620 product(bool, UsePerfData, falseInEmbedded, \ 3621 "Flag to disable jvmstat instrumentation for performance testing" \ 3622 "and problem isolation purposes.") \ 3623 \ 3624 product(bool, PerfDataSaveToFile, false, \ 3625 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3626 \ 3627 product(ccstr, PerfDataSaveFile, NULL, \ 3628 "Save PerfData memory to the specified absolute pathname," \ 3629 "%p in the file name if present will be replaced by pid") \ 3630 \ 3631 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3632 "Data sampling interval in milliseconds") \ 3633 \ 3634 develop(bool, PerfTraceDataCreation, false, \ 3635 "Trace creation of Performance Data Entries") \ 3636 \ 3637 develop(bool, PerfTraceMemOps, false, \ 3638 "Trace PerfMemory create/attach/detach calls") \ 3639 \ 3640 product(bool, PerfDisableSharedMem, false, \ 3641 "Store performance data in standard memory") \ 3642 \ 3643 product(intx, PerfDataMemorySize, 32*K, \ 3644 "Size of performance data memory region. Will be rounded " \ 3645 "up to a multiple of the native os page size.") \ 3646 \ 3647 product(intx, PerfMaxStringConstLength, 1024, \ 3648 "Maximum PerfStringConstant string length before truncation") \ 3649 \ 3650 product(bool, PerfAllowAtExitRegistration, false, \ 3651 "Allow registration of atexit() methods") \ 3652 \ 3653 product(bool, PerfBypassFileSystemCheck, false, \ 3654 "Bypass Win32 file system criteria checks (Windows Only)") \ 3655 \ 3656 product(intx, UnguardOnExecutionViolation, 0, \ 3657 "Unguard page and retry on no-execute fault (Win32 only)" \ 3658 "0=off, 1=conservative, 2=aggressive") \ 3659 \ 3660 /* Serviceability Support */ \ 3661 \ 3662 product(bool, ManagementServer, false, \ 3663 "Create JMX Management Server") \ 3664 \ 3665 product(bool, DisableAttachMechanism, false, \ 3666 "Disable mechanism that allows tools to attach to this VM") \ 3667 \ 3668 product(bool, StartAttachListener, false, \ 3669 "Always start Attach Listener at VM startup") \ 3670 \ 3671 manageable(bool, PrintConcurrentLocks, false, \ 3672 "Print java.util.concurrent locks in thread dump") \ 3673 \ 3674 product(bool, TransmitErrorReport, false, \ 3675 "Enable error report transmission on erroneous termination") \ 3676 \ 3677 product(ccstr, ErrorReportServer, NULL, \ 3678 "Override built-in error report server address") \ 3679 \ 3680 /* Shared spaces */ \ 3681 \ 3682 product(bool, UseSharedSpaces, true, \ 3683 "Use shared spaces in the permanent generation") \ 3684 \ 3685 product(bool, RequireSharedSpaces, false, \ 3686 "Require shared spaces in the permanent generation") \ 3687 \ 3688 product(bool, DumpSharedSpaces, false, \ 3689 "Special mode: JVM reads a class list, loads classes, builds " \ 3690 "shared spaces, and dumps the shared spaces to a file to be " \ 3691 "used in future JVM runs.") \ 3692 \ 3693 product(bool, PrintSharedSpaces, false, \ 3694 "Print usage of shared spaces") \ 3695 \ 3696 product(uintx, SharedDummyBlockSize, 512*M, \ 3697 "Size of dummy block used to shift heap addresses (in bytes)") \ 3698 \ 3699 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3700 "Size of read-write space in permanent generation (in bytes)") \ 3701 \ 3702 product(uintx, SharedReadOnlySize, 10*M, \ 3703 "Size of read-only space in permanent generation (in bytes)") \ 3704 \ 3705 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3706 "Size of the shared data area adjacent to the heap (in bytes)") \ 3707 \ 3708 product(uintx, SharedMiscCodeSize, 4*M, \ 3709 "Size of the shared code area adjacent to the heap (in bytes)") \ 3710 \ 3711 diagnostic(bool, SharedOptimizeColdStart, true, \ 3712 "At dump time, order shared objects to achieve better " \ 3713 "cold startup time.") \ 3714 \ 3715 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3716 "Reordering policy for SharedOptimizeColdStart " \ 3717 "0=favor classload-time locality, 1=balanced, " \ 3718 "2=favor runtime locality") \ 3719 \ 3720 diagnostic(bool, SharedSkipVerify, false, \ 3721 "Skip assert() and verify() which page-in unwanted shared " \ 3722 "objects. ") \ 3723 \ 3724 diagnostic(bool, EnableInvokeDynamic, true, \ 3725 "support JSR 292 (method handles, invokedynamic, " \ 3726 "anonymous classes") \ 3727 \ 3728 product(bool, AnonymousClasses, false, \ 3729 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3730 \ 3731 experimental(bool, EnableMethodHandles, false, \ 3732 "support method handles (deprecated)") \ 3733 \ 3734 diagnostic(intx, MethodHandlePushLimit, 3, \ 3735 "number of additional stack slots a method handle may push") \ 3736 \ 3737 diagnostic(bool, PrintMethodHandleStubs, false, \ 3738 "Print generated stub code for method handles") \ 3739 \ 3740 develop(bool, TraceMethodHandles, false, \ 3741 "trace internal method handle operations") \ 3742 \ 3743 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3744 "perform extra checks when constructing method handles") \ 3745 \ 3746 diagnostic(bool, OptimizeMethodHandles, true, \ 3747 "when constructing method handles, try to improve them") \ 3748 \ 3749 develop(bool, StressMethodHandleWalk, false, \ 3750 "Process all method handles with MethodHandleWalk") \ 3751 \ 3752 diagnostic(bool, UseRicochetFrames, true, \ 3753 "use ricochet stack frames for method handle combination, " \ 3754 "if the platform supports them") \ 3755 \ 3756 experimental(bool, TrustFinalNonStaticFields, false, \ 3757 "trust final non-static declarations for constant folding") \ 3758 \ 3759 experimental(bool, AllowInvokeGeneric, false, \ 3760 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3761 "as equivalent methods") \ 3762 \ 3763 develop(bool, TraceInvokeDynamic, false, \ 3764 "trace internal invoke dynamic operations") \ 3765 \ 3766 diagnostic(bool, PauseAtStartup, false, \ 3767 "Causes the VM to pause at startup time and wait for the pause " \ 3768 "file to be removed (default: ./vm.paused.<pid>)") \ 3769 \ 3770 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3771 "The file to create and for whose removal to await when pausing " \ 3772 "at startup. (default: ./vm.paused.<pid>)") \ 3773 \ 3774 diagnostic(bool, PauseAtExit, false, \ 3775 "Pause and wait for keypress on exit if a debugger is attached") \ 3776 \ 3777 product(bool, ExtendedDTraceProbes, false, \ 3778 "Enable performance-impacting dtrace probes") \ 3779 \ 3780 product(bool, DTraceMethodProbes, false, \ 3781 "Enable dtrace probes for method-entry and method-exit") \ 3782 \ 3783 product(bool, DTraceAllocProbes, false, \ 3784 "Enable dtrace probes for object allocation") \ 3785 \ 3786 product(bool, DTraceMonitorProbes, false, \ 3787 "Enable dtrace probes for monitor events") \ 3788 \ 3789 product(bool, RelaxAccessControlCheck, false, \ 3790 "Relax the access control checks in the verifier") \ 3791 \ 3792 diagnostic(bool, PrintDTraceDOF, false, \ 3793 "Print the DTrace DOF passed to the system for JSDT probes") \ 3794 \ 3795 product(uintx, StringTableSize, 1009, \ 3796 "Number of buckets in the interned String table") \ 3797 \ 3798 product(bool, UseVMInterruptibleIO, false, \ 3799 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3800 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3801 " of this flag is true for JDK 6 and earliers") 3802 3803/* 3804 * Macros for factoring of globals 3805 */ 3806 3807// Interface macros 3808#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3809#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3810#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3811#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3812#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3813#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3814#ifdef PRODUCT 3815#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3816#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3817#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3818#else 3819#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3820#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3821#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3822#endif 3823// Special LP64 flags, product only needed for now. 3824#ifdef _LP64 3825#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3826#else 3827#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3828#endif // _LP64 3829 3830// Implementation macros 3831#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3832#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3833#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3834#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3835#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3836#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3837#ifdef PRODUCT 3838#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3839#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3840#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3841#else 3842#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3843#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3844#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3845#endif 3846#ifdef _LP64 3847#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3848#else 3849#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3850#endif // _LP64 3851 3852RUNTIME_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) 3853 3854RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3855 3856#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3857