globals.hpp revision 2967:4f25538b54c9
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_FAMILY_bsd 54# include "globals_bsd.hpp" 55#endif 56#ifdef TARGET_OS_ARCH_linux_x86 57# include "globals_linux_x86.hpp" 58#endif 59#ifdef TARGET_OS_ARCH_linux_sparc 60# include "globals_linux_sparc.hpp" 61#endif 62#ifdef TARGET_OS_ARCH_linux_zero 63# include "globals_linux_zero.hpp" 64#endif 65#ifdef TARGET_OS_ARCH_solaris_x86 66# include "globals_solaris_x86.hpp" 67#endif 68#ifdef TARGET_OS_ARCH_solaris_sparc 69# include "globals_solaris_sparc.hpp" 70#endif 71#ifdef TARGET_OS_ARCH_windows_x86 72# include "globals_windows_x86.hpp" 73#endif 74#ifdef TARGET_OS_ARCH_linux_arm 75# include "globals_linux_arm.hpp" 76#endif 77#ifdef TARGET_OS_ARCH_linux_ppc 78# include "globals_linux_ppc.hpp" 79#endif 80#ifdef TARGET_OS_ARCH_bsd_x86 81# include "globals_bsd_x86.hpp" 82#endif 83#ifdef TARGET_OS_ARCH_bsd_zero 84# include "globals_bsd_zero.hpp" 85#endif 86#ifdef COMPILER1 87#ifdef TARGET_ARCH_x86 88# include "c1_globals_x86.hpp" 89#endif 90#ifdef TARGET_ARCH_sparc 91# include "c1_globals_sparc.hpp" 92#endif 93#ifdef TARGET_ARCH_arm 94# include "c1_globals_arm.hpp" 95#endif 96#ifdef TARGET_ARCH_ppc 97# include "c1_globals_ppc.hpp" 98#endif 99#ifdef TARGET_OS_FAMILY_linux 100# include "c1_globals_linux.hpp" 101#endif 102#ifdef TARGET_OS_FAMILY_solaris 103# include "c1_globals_solaris.hpp" 104#endif 105#ifdef TARGET_OS_FAMILY_windows 106# include "c1_globals_windows.hpp" 107#endif 108#ifdef TARGET_OS_FAMILY_bsd 109# include "c1_globals_bsd.hpp" 110#endif 111#endif 112#ifdef COMPILER2 113#ifdef TARGET_ARCH_x86 114# include "c2_globals_x86.hpp" 115#endif 116#ifdef TARGET_ARCH_sparc 117# include "c2_globals_sparc.hpp" 118#endif 119#ifdef TARGET_ARCH_arm 120# include "c2_globals_arm.hpp" 121#endif 122#ifdef TARGET_OS_FAMILY_linux 123# include "c2_globals_linux.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_solaris 126# include "c2_globals_solaris.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_windows 129# include "c2_globals_windows.hpp" 130#endif 131#ifdef TARGET_OS_FAMILY_bsd 132# include "c2_globals_bsd.hpp" 133#endif 134#endif 135#ifdef SHARK 136#ifdef TARGET_ARCH_zero 137# include "shark_globals_zero.hpp" 138#endif 139#endif 140 141#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 142define_pd_global(bool, BackgroundCompilation, false); 143define_pd_global(bool, UseTLAB, false); 144define_pd_global(bool, CICompileOSR, false); 145define_pd_global(bool, UseTypeProfile, false); 146define_pd_global(bool, UseOnStackReplacement, false); 147define_pd_global(bool, InlineIntrinsics, false); 148define_pd_global(bool, PreferInterpreterNativeStubs, true); 149define_pd_global(bool, ProfileInterpreter, false); 150define_pd_global(bool, ProfileTraps, false); 151define_pd_global(bool, TieredCompilation, false); 152 153define_pd_global(intx, CompileThreshold, 0); 154define_pd_global(intx, BackEdgeThreshold, 0); 155 156define_pd_global(intx, OnStackReplacePercentage, 0); 157define_pd_global(bool, ResizeTLAB, false); 158define_pd_global(intx, FreqInlineSize, 0); 159define_pd_global(intx, InlineSmallCode, 0); 160define_pd_global(intx, NewSizeThreadIncrease, 4*K); 161define_pd_global(intx, InlineClassNatives, true); 162define_pd_global(intx, InlineUnsafeOps, true); 163define_pd_global(intx, InitialCodeCacheSize, 160*K); 164define_pd_global(intx, ReservedCodeCacheSize, 32*M); 165define_pd_global(intx, CodeCacheExpansionSize, 32*K); 166define_pd_global(intx, CodeCacheMinBlockLength, 1); 167define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 168define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 169define_pd_global(bool, NeverActAsServerClassMachine, true); 170define_pd_global(uint64_t,MaxRAM, 1ULL*G); 171#define CI_COMPILER_COUNT 0 172#else 173 174#ifdef COMPILER2 175#define CI_COMPILER_COUNT 2 176#else 177#define CI_COMPILER_COUNT 1 178#endif // COMPILER2 179 180#endif // no compilers 181 182 183// string type aliases used only in this file 184typedef const char* ccstr; 185typedef const char* ccstrlist; // represents string arguments which accumulate 186 187enum FlagValueOrigin { 188 DEFAULT = 0, 189 COMMAND_LINE = 1, 190 ENVIRON_VAR = 2, 191 CONFIG_FILE = 3, 192 MANAGEMENT = 4, 193 ERGONOMIC = 5, 194 ATTACH_ON_DEMAND = 6, 195 INTERNAL = 99 196}; 197 198struct Flag { 199 const char *type; 200 const char *name; 201 void* addr; 202 203 NOT_PRODUCT(const char *doc;) 204 205 const char *kind; 206 FlagValueOrigin origin; 207 208 // points to all Flags static array 209 static Flag *flags; 210 211 // number of flags 212 static size_t numFlags; 213 214 static Flag* find_flag(char* name, size_t length); 215 216 bool is_bool() const { return strcmp(type, "bool") == 0; } 217 bool get_bool() const { return *((bool*) addr); } 218 void set_bool(bool value) { *((bool*) addr) = value; } 219 220 bool is_intx() const { return strcmp(type, "intx") == 0; } 221 intx get_intx() const { return *((intx*) addr); } 222 void set_intx(intx value) { *((intx*) addr) = value; } 223 224 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 225 uintx get_uintx() const { return *((uintx*) addr); } 226 void set_uintx(uintx value) { *((uintx*) addr) = value; } 227 228 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 229 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 230 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 231 232 bool is_double() const { return strcmp(type, "double") == 0; } 233 double get_double() const { return *((double*) addr); } 234 void set_double(double value) { *((double*) addr) = value; } 235 236 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 237 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 238 ccstr get_ccstr() const { return *((ccstr*) addr); } 239 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 240 241 bool is_unlocker() const; 242 bool is_unlocked() const; 243 bool is_writeable() const; 244 bool is_external() const; 245 246 bool is_unlocker_ext() const; 247 bool is_unlocked_ext() const; 248 bool is_writeable_ext() const; 249 bool is_external_ext() const; 250 251 void print_on(outputStream* st, bool withComments = false ); 252 void print_as_flag(outputStream* st); 253}; 254 255// debug flags control various aspects of the VM and are global accessible 256 257// use FlagSetting to temporarily change some debug flag 258// e.g. FlagSetting fs(DebugThisAndThat, true); 259// restored to previous value upon leaving scope 260class FlagSetting { 261 bool val; 262 bool* flag; 263 public: 264 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 265 ~FlagSetting() { *flag = val; } 266}; 267 268 269class CounterSetting { 270 intx* counter; 271 public: 272 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 273 ~CounterSetting() { (*counter)--; } 274}; 275 276 277class IntFlagSetting { 278 intx val; 279 intx* flag; 280 public: 281 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 282 ~IntFlagSetting() { *flag = val; } 283}; 284 285 286class DoubleFlagSetting { 287 double val; 288 double* flag; 289 public: 290 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 291 ~DoubleFlagSetting() { *flag = val; } 292}; 293 294 295class CommandLineFlags { 296 public: 297 static bool boolAt(char* name, size_t len, bool* value); 298 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 299 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 300 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 301 302 static bool intxAt(char* name, size_t len, intx* value); 303 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 304 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 305 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 306 307 static bool uintxAt(char* name, size_t len, uintx* value); 308 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 309 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 310 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 311 312 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 313 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 314 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 315 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 316 317 static bool doubleAt(char* name, size_t len, double* value); 318 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 319 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 320 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 321 322 static bool ccstrAt(char* name, size_t len, ccstr* value); 323 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 324 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 325 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 326 327 // Returns false if name is not a command line flag. 328 static bool wasSetOnCmdline(const char* name, bool* value); 329 static void printSetFlags(outputStream* out); 330 331 static void printFlags(outputStream* out, bool withComments); 332 333 static void verify() PRODUCT_RETURN; 334}; 335 336// use this for flags that are true by default in the debug version but 337// false in the optimized version, and vice versa 338#ifdef ASSERT 339#define trueInDebug true 340#define falseInDebug false 341#else 342#define trueInDebug false 343#define falseInDebug true 344#endif 345 346// use this for flags that are true per default in the product build 347// but false in development builds, and vice versa 348#ifdef PRODUCT 349#define trueInProduct true 350#define falseInProduct false 351#else 352#define trueInProduct false 353#define falseInProduct true 354#endif 355 356// use this for flags that are true per default in the tiered build 357// but false in non-tiered builds, and vice versa 358#ifdef TIERED 359#define trueInTiered true 360#define falseInTiered false 361#else 362#define trueInTiered false 363#define falseInTiered true 364#endif 365 366#ifdef JAVASE_EMBEDDED 367#define falseInEmbedded false 368#else 369#define falseInEmbedded true 370#endif 371 372// develop flags are settable / visible only during development and are constant in the PRODUCT version 373// product flags are always settable / visible 374// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 375 376// A flag must be declared with one of the following types: 377// bool, intx, uintx, ccstr. 378// The type "ccstr" is an alias for "const char*" and is used 379// only in this file, because the macrology requires single-token type names. 380 381// Note: Diagnostic options not meant for VM tuning or for product modes. 382// They are to be used for VM quality assurance or field diagnosis 383// of VM bugs. They are hidden so that users will not be encouraged to 384// try them as if they were VM ordinary execution options. However, they 385// are available in the product version of the VM. Under instruction 386// from support engineers, VM customers can turn them on to collect 387// diagnostic information about VM problems. To use a VM diagnostic 388// option, you must first specify +UnlockDiagnosticVMOptions. 389// (This master switch also affects the behavior of -Xprintflags.) 390// 391// experimental flags are in support of features that are not 392// part of the officially supported product, but are available 393// for experimenting with. They could, for example, be performance 394// features that may not have undergone full or rigorous QA, but which may 395// help performance in some cases and released for experimentation 396// by the community of users and developers. This flag also allows one to 397// be able to build a fully supported product that nonetheless also 398// ships with some unsupported, lightly tested, experimental features. 399// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 400// UnlockExperimentalVMOptions flag, which allows the control and 401// modification of the experimental flags. 402// 403// Nota bene: neither diagnostic nor experimental options should be used casually, 404// and they are not supported on production loads, except under explicit 405// direction from support engineers. 406// 407// manageable flags are writeable external product flags. 408// They are dynamically writeable through the JDK management interface 409// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 410// These flags are external exported interface (see CCC). The list of 411// manageable flags can be queried programmatically through the management 412// interface. 413// 414// A flag can be made as "manageable" only if 415// - the flag is defined in a CCC as an external exported interface. 416// - the VM implementation supports dynamic setting of the flag. 417// This implies that the VM must *always* query the flag variable 418// and not reuse state related to the flag state at any given time. 419// - you want the flag to be queried programmatically by the customers. 420// 421// product_rw flags are writeable internal product flags. 422// They are like "manageable" flags but for internal/private use. 423// The list of product_rw flags are internal/private flags which 424// may be changed/removed in a future release. It can be set 425// through the management interface to get/set value 426// when the name of flag is supplied. 427// 428// A flag can be made as "product_rw" only if 429// - the VM implementation supports dynamic setting of the flag. 430// This implies that the VM must *always* query the flag variable 431// and not reuse state related to the flag state at any given time. 432// 433// Note that when there is a need to support develop flags to be writeable, 434// it can be done in the same way as product_rw. 435 436#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 437 \ 438 lp64_product(bool, UseCompressedOops, false, \ 439 "Use 32-bit object references in 64-bit VM. " \ 440 "lp64_product means flag is always constant in 32 bit VM") \ 441 \ 442 notproduct(bool, CheckCompressedOops, true, \ 443 "generate checks in encoding/decoding code in debug VM") \ 444 \ 445 product_pd(uintx, HeapBaseMinAddress, \ 446 "OS specific low limit for heap base address") \ 447 \ 448 diagnostic(bool, PrintCompressedOopsMode, false, \ 449 "Print compressed oops base address and encoding mode") \ 450 \ 451 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 452 "Default object alignment in bytes, 8 is minimum") \ 453 \ 454 /* UseMembar is theoretically a temp flag used for memory barrier \ 455 * removal testing. It was supposed to be removed before FCS but has \ 456 * been re-added (see 6401008) */ \ 457 product_pd(bool, UseMembar, \ 458 "(Unstable) Issues membars on thread state transitions") \ 459 \ 460 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 461 * that don't support it. This will be replaced by processor detection \ 462 * logic. \ 463 */ \ 464 product(bool, UsePPCLWSYNC, true, \ 465 "Use lwsync instruction if true, else use slower sync") \ 466 \ 467 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 468 "Whether to clean the chunk pool asynchronously") \ 469 \ 470 /* Temporary: See 6948537 */ \ 471 experimental(bool, UseMemSetInBOT, true, \ 472 "(Unstable) uses memset in BOT updates in GC code") \ 473 \ 474 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 475 "Enable normal processing of flags relating to field diagnostics")\ 476 \ 477 experimental(bool, UnlockExperimentalVMOptions, false, \ 478 "Enable normal processing of flags relating to experimental features")\ 479 \ 480 product(bool, JavaMonitorsInStackTrace, true, \ 481 "Print info. about Java monitor locks when the stacks are dumped")\ 482 \ 483 product_pd(bool, UseLargePages, \ 484 "Use large page memory") \ 485 \ 486 product_pd(bool, UseLargePagesIndividualAllocation, \ 487 "Allocate large pages individually for better affinity") \ 488 \ 489 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 490 "Fail large pages individual allocation") \ 491 \ 492 develop(bool, TracePageSizes, false, \ 493 "Trace page size selection and usage.") \ 494 \ 495 product(bool, UseNUMA, false, \ 496 "Use NUMA if available") \ 497 \ 498 product(bool, UseNUMAInterleaving, false, \ 499 "Interleave memory across NUMA nodes if available") \ 500 \ 501 product(uintx, NUMAInterleaveGranularity, 2*M, \ 502 "Granularity to use for NUMA interleaving on Windows OS") \ 503 \ 504 product(bool, ForceNUMA, false, \ 505 "Force NUMA optimizations on single-node/UMA systems") \ 506 \ 507 product(intx, NUMAChunkResizeWeight, 20, \ 508 "Percentage (0-100) used to weight the current sample when " \ 509 "computing exponentially decaying average for " \ 510 "AdaptiveNUMAChunkSizing") \ 511 \ 512 product(intx, NUMASpaceResizeRate, 1*G, \ 513 "Do not reallocate more that this amount per collection") \ 514 \ 515 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 516 "Enable adaptive chunk sizing for NUMA") \ 517 \ 518 product(bool, NUMAStats, false, \ 519 "Print NUMA stats in detailed heap information") \ 520 \ 521 product(intx, NUMAPageScanRate, 256, \ 522 "Maximum number of pages to include in the page scan procedure") \ 523 \ 524 product_pd(bool, NeedsDeoptSuspend, \ 525 "True for register window machines (sparc/ia64)") \ 526 \ 527 product(intx, UseSSE, 99, \ 528 "Highest supported SSE instructions set on x86/x64") \ 529 \ 530 product(intx, UseVIS, 99, \ 531 "Highest supported VIS instructions set on Sparc") \ 532 \ 533 product(uintx, LargePageSizeInBytes, 0, \ 534 "Large page size (0 to let VM choose the page size") \ 535 \ 536 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 537 "Use large pages if max heap is at least this big") \ 538 \ 539 product(bool, ForceTimeHighResolution, false, \ 540 "Using high time resolution(For Win32 only)") \ 541 \ 542 develop(bool, TraceItables, false, \ 543 "Trace initialization and use of itables") \ 544 \ 545 develop(bool, TracePcPatching, false, \ 546 "Trace usage of frame::patch_pc") \ 547 \ 548 develop(bool, TraceJumps, false, \ 549 "Trace assembly jumps in thread ring buffer") \ 550 \ 551 develop(bool, TraceRelocator, false, \ 552 "Trace the bytecode relocator") \ 553 \ 554 develop(bool, TraceLongCompiles, false, \ 555 "Print out every time compilation is longer than " \ 556 "a given threashold") \ 557 \ 558 develop(bool, SafepointALot, false, \ 559 "Generates a lot of safepoints. Works with " \ 560 "GuaranteedSafepointInterval") \ 561 \ 562 product_pd(bool, BackgroundCompilation, \ 563 "A thread requesting compilation is not blocked during " \ 564 "compilation") \ 565 \ 566 product(bool, PrintVMQWaitTime, false, \ 567 "Prints out the waiting time in VM operation queue") \ 568 \ 569 develop(bool, BailoutToInterpreterForThrows, false, \ 570 "Compiled methods which throws/catches exceptions will be " \ 571 "deopt and intp.") \ 572 \ 573 develop(bool, NoYieldsInMicrolock, false, \ 574 "Disable yields in microlock") \ 575 \ 576 develop(bool, TraceOopMapGeneration, false, \ 577 "Shows oopmap generation") \ 578 \ 579 product(bool, MethodFlushing, true, \ 580 "Reclamation of zombie and not-entrant methods") \ 581 \ 582 develop(bool, VerifyStack, false, \ 583 "Verify stack of each thread when it is entering a runtime call") \ 584 \ 585 diagnostic(bool, ForceUnreachable, false, \ 586 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 587 \ 588 notproduct(bool, StressDerivedPointers, false, \ 589 "Force scavenge when a derived pointers is detected on stack " \ 590 "after rtm call") \ 591 \ 592 develop(bool, TraceDerivedPointers, false, \ 593 "Trace traversal of derived pointers on stack") \ 594 \ 595 notproduct(bool, TraceCodeBlobStacks, false, \ 596 "Trace stack-walk of codeblobs") \ 597 \ 598 product(bool, PrintJNIResolving, false, \ 599 "Used to implement -v:jni") \ 600 \ 601 notproduct(bool, PrintRewrites, false, \ 602 "Print methods that are being rewritten") \ 603 \ 604 product(bool, UseInlineCaches, true, \ 605 "Use Inline Caches for virtual calls ") \ 606 \ 607 develop(bool, InlineArrayCopy, true, \ 608 "inline arraycopy native that is known to be part of " \ 609 "base library DLL") \ 610 \ 611 develop(bool, InlineObjectHash, true, \ 612 "inline Object::hashCode() native that is known to be part " \ 613 "of base library DLL") \ 614 \ 615 develop(bool, InlineObjectCopy, true, \ 616 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 617 \ 618 develop(bool, InlineNatives, true, \ 619 "inline natives that are known to be part of base library DLL") \ 620 \ 621 develop(bool, InlineMathNatives, true, \ 622 "inline SinD, CosD, etc.") \ 623 \ 624 develop(bool, InlineClassNatives, true, \ 625 "inline Class.isInstance, etc") \ 626 \ 627 develop(bool, InlineAtomicLong, true, \ 628 "inline sun.misc.AtomicLong") \ 629 \ 630 develop(bool, InlineThreadNatives, true, \ 631 "inline Thread.currentThread, etc") \ 632 \ 633 develop(bool, InlineReflectionGetCallerClass, true, \ 634 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 635 "of base library DLL") \ 636 \ 637 develop(bool, InlineUnsafeOps, true, \ 638 "inline memory ops (native methods) from sun.misc.Unsafe") \ 639 \ 640 develop(bool, ConvertCmpD2CmpF, true, \ 641 "Convert cmpD to cmpF when one input is constant in float range") \ 642 \ 643 develop(bool, ConvertFloat2IntClipping, true, \ 644 "Convert float2int clipping idiom to integer clipping") \ 645 \ 646 develop(bool, SpecialStringCompareTo, true, \ 647 "special version of string compareTo") \ 648 \ 649 develop(bool, SpecialStringIndexOf, true, \ 650 "special version of string indexOf") \ 651 \ 652 develop(bool, SpecialStringEquals, true, \ 653 "special version of string equals") \ 654 \ 655 develop(bool, SpecialArraysEquals, true, \ 656 "special version of Arrays.equals(char[],char[])") \ 657 \ 658 product(bool, UseSSE42Intrinsics, false, \ 659 "SSE4.2 versions of intrinsics") \ 660 \ 661 product(bool, UseCondCardMark, false, \ 662 "Check for already marked card before updating card table") \ 663 \ 664 develop(bool, TraceCallFixup, false, \ 665 "traces all call fixups") \ 666 \ 667 develop(bool, DeoptimizeALot, false, \ 668 "deoptimize at every exit from the runtime system") \ 669 \ 670 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 671 "a comma separated list of bcis to deoptimize at") \ 672 \ 673 product(bool, DeoptimizeRandom, false, \ 674 "deoptimize random frames on random exit from the runtime system")\ 675 \ 676 notproduct(bool, ZombieALot, false, \ 677 "creates zombies (non-entrant) at exit from the runt. system") \ 678 \ 679 product(bool, UnlinkSymbolsALot, false, \ 680 "unlink unreferenced symbols from the symbol table at safepoints")\ 681 \ 682 notproduct(bool, WalkStackALot, false, \ 683 "trace stack (no print) at every exit from the runtime system") \ 684 \ 685 product(bool, Debugging, false, \ 686 "set when executing debug methods in debug.ccp " \ 687 "(to prevent triggering assertions)") \ 688 \ 689 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 690 "Enable strict checks that safepoints cannot happen for threads " \ 691 "that used No_Safepoint_Verifier") \ 692 \ 693 notproduct(bool, VerifyLastFrame, false, \ 694 "Verify oops on last frame on entry to VM") \ 695 \ 696 develop(bool, TraceHandleAllocation, false, \ 697 "Prints out warnings when suspicious many handles are allocated") \ 698 \ 699 product(bool, UseCompilerSafepoints, true, \ 700 "Stop at safepoints in compiled code") \ 701 \ 702 product(bool, UseSplitVerifier, true, \ 703 "use split verifier with StackMapTable attributes") \ 704 \ 705 product(bool, FailOverToOldVerifier, true, \ 706 "fail over to old verifier when split verifier fails") \ 707 \ 708 develop(bool, ShowSafepointMsgs, false, \ 709 "Show msg. about safepoint synch.") \ 710 \ 711 product(bool, SafepointTimeout, false, \ 712 "Time out and warn or fail after SafepointTimeoutDelay " \ 713 "milliseconds if failed to reach safepoint") \ 714 \ 715 develop(bool, DieOnSafepointTimeout, false, \ 716 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 717 \ 718 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 719 /* typically, at most a few retries are needed */ \ 720 product(intx, SuspendRetryCount, 50, \ 721 "Maximum retry count for an external suspend request") \ 722 \ 723 product(intx, SuspendRetryDelay, 5, \ 724 "Milliseconds to delay per retry (* current_retry_count)") \ 725 \ 726 product(bool, AssertOnSuspendWaitFailure, false, \ 727 "Assert/Guarantee on external suspend wait failure") \ 728 \ 729 product(bool, TraceSuspendWaitFailures, false, \ 730 "Trace external suspend wait failures") \ 731 \ 732 product(bool, MaxFDLimit, true, \ 733 "Bump the number of file descriptors to max in solaris.") \ 734 \ 735 notproduct(bool, LogEvents, trueInDebug, \ 736 "Enable Event log") \ 737 \ 738 product(bool, BytecodeVerificationRemote, true, \ 739 "Enables the Java bytecode verifier for remote classes") \ 740 \ 741 product(bool, BytecodeVerificationLocal, false, \ 742 "Enables the Java bytecode verifier for local classes") \ 743 \ 744 develop(bool, ForceFloatExceptions, trueInDebug, \ 745 "Force exceptions on FP stack under/overflow") \ 746 \ 747 develop(bool, SoftMatchFailure, trueInProduct, \ 748 "If the DFA fails to match a node, print a message and bail out") \ 749 \ 750 develop(bool, VerifyStackAtCalls, false, \ 751 "Verify that the stack pointer is unchanged after calls") \ 752 \ 753 develop(bool, TraceJavaAssertions, false, \ 754 "Trace java language assertions") \ 755 \ 756 notproduct(bool, CheckAssertionStatusDirectives, false, \ 757 "temporary - see javaClasses.cpp") \ 758 \ 759 notproduct(bool, PrintMallocFree, false, \ 760 "Trace calls to C heap malloc/free allocation") \ 761 \ 762 product(bool, PrintOopAddress, false, \ 763 "Always print the location of the oop") \ 764 \ 765 notproduct(bool, VerifyCodeCacheOften, false, \ 766 "Verify compiled-code cache often") \ 767 \ 768 develop(bool, ZapDeadCompiledLocals, false, \ 769 "Zap dead locals in compiler frames") \ 770 \ 771 notproduct(bool, ZapDeadLocalsOld, false, \ 772 "Zap dead locals (old version, zaps all frames when " \ 773 "entering the VM") \ 774 \ 775 notproduct(bool, CheckOopishValues, false, \ 776 "Warn if value contains oop ( requires ZapDeadLocals)") \ 777 \ 778 develop(bool, UseMallocOnly, false, \ 779 "use only malloc/free for allocation (no resource area/arena)") \ 780 \ 781 develop(bool, PrintMalloc, false, \ 782 "print all malloc/free calls") \ 783 \ 784 develop(bool, PrintMallocStatistics, false, \ 785 "print malloc/free statistics") \ 786 \ 787 develop(bool, ZapResourceArea, trueInDebug, \ 788 "Zap freed resource/arena space with 0xABABABAB") \ 789 \ 790 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 791 "Zap freed VM handle space with 0xBCBCBCBC") \ 792 \ 793 develop(bool, ZapJNIHandleArea, trueInDebug, \ 794 "Zap freed JNI handle space with 0xFEFEFEFE") \ 795 \ 796 notproduct(bool, ZapStackSegments, trueInDebug, \ 797 "Zap allocated/freed Stack segments with 0xFADFADED") \ 798 \ 799 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 800 "Zap unused heap space with 0xBAADBABE") \ 801 \ 802 develop(bool, TraceZapUnusedHeapArea, false, \ 803 "Trace zapping of unused heap space") \ 804 \ 805 develop(bool, CheckZapUnusedHeapArea, false, \ 806 "Check zapping of unused heap space") \ 807 \ 808 develop(bool, ZapFillerObjects, trueInDebug, \ 809 "Zap filler objects with 0xDEAFBABE") \ 810 \ 811 develop(bool, PrintVMMessages, true, \ 812 "Print vm messages on console") \ 813 \ 814 product(bool, PrintGCApplicationConcurrentTime, false, \ 815 "Print the time the application has been running") \ 816 \ 817 product(bool, PrintGCApplicationStoppedTime, false, \ 818 "Print the time the application has been stopped") \ 819 \ 820 notproduct(uintx, ErrorHandlerTest, 0, \ 821 "If > 0, provokes an error after VM initialization; the value" \ 822 "determines which error to provoke. See test_error_handler()" \ 823 "in debug.cpp.") \ 824 \ 825 develop(bool, Verbose, false, \ 826 "Prints additional debugging information from other modes") \ 827 \ 828 develop(bool, PrintMiscellaneous, false, \ 829 "Prints uncategorized debugging information (requires +Verbose)") \ 830 \ 831 develop(bool, WizardMode, false, \ 832 "Prints much more debugging information") \ 833 \ 834 product(bool, ShowMessageBoxOnError, false, \ 835 "Keep process alive on VM fatal error") \ 836 \ 837 product(bool, CreateMinidumpOnCrash, false, \ 838 "Create minidump on VM fatal error") \ 839 \ 840 product_pd(bool, UseOSErrorReporting, \ 841 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 842 \ 843 product(bool, SuppressFatalErrorMessage, false, \ 844 "Do NO Fatal Error report [Avoid deadlock]") \ 845 \ 846 product(ccstrlist, OnError, "", \ 847 "Run user-defined commands on fatal error; see VMError.cpp " \ 848 "for examples") \ 849 \ 850 product(ccstrlist, OnOutOfMemoryError, "", \ 851 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 852 \ 853 manageable(bool, HeapDumpBeforeFullGC, false, \ 854 "Dump heap to file before any major stop-world GC") \ 855 \ 856 manageable(bool, HeapDumpAfterFullGC, false, \ 857 "Dump heap to file after any major stop-world GC") \ 858 \ 859 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 860 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 861 \ 862 manageable(ccstr, HeapDumpPath, NULL, \ 863 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 864 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 865 "in the working directory)") \ 866 \ 867 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 868 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 869 "when the heap usage is larger than this") \ 870 \ 871 develop(uintx, HeapDumpSegmentSize, 1*G, \ 872 "Approximate segment size when generating a segmented heap dump") \ 873 \ 874 develop(bool, BreakAtWarning, false, \ 875 "Execute breakpoint upon encountering VM warning") \ 876 \ 877 product_pd(bool, UseVectoredExceptions, \ 878 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 879 \ 880 develop(bool, TraceVMOperation, false, \ 881 "Trace vm operations") \ 882 \ 883 develop(bool, UseFakeTimers, false, \ 884 "Tells whether the VM should use system time or a fake timer") \ 885 \ 886 diagnostic(bool, LogCompilation, false, \ 887 "Log compilation activity in detail to hotspot.log or LogFile") \ 888 \ 889 product(bool, PrintCompilation, false, \ 890 "Print compilations") \ 891 \ 892 diagnostic(bool, TraceNMethodInstalls, false, \ 893 "Trace nmethod intallation") \ 894 \ 895 diagnostic(intx, ScavengeRootsInCode, 2, \ 896 "0: do not allow scavengable oops in the code cache; " \ 897 "1: allow scavenging from the code cache; " \ 898 "2: emit as many constants as the compiler can see") \ 899 \ 900 diagnostic(bool, TraceOSRBreakpoint, false, \ 901 "Trace OSR Breakpoint ") \ 902 \ 903 diagnostic(bool, TraceCompileTriggered, false, \ 904 "Trace compile triggered") \ 905 \ 906 diagnostic(bool, TraceTriggers, false, \ 907 "Trace triggers") \ 908 \ 909 product(bool, AlwaysRestoreFPU, false, \ 910 "Restore the FPU control word after every JNI call (expensive)") \ 911 \ 912 diagnostic(bool, PrintCompilation2, false, \ 913 "Print additional statistics per compilation") \ 914 \ 915 diagnostic(bool, PrintAdapterHandlers, false, \ 916 "Print code generated for i2c/c2i adapters") \ 917 \ 918 develop(bool, VerifyAdapterSharing, false, \ 919 "Verify that the code for shared adapters is the equivalent") \ 920 \ 921 diagnostic(bool, PrintAssembly, false, \ 922 "Print assembly code (using external disassembler.so)") \ 923 \ 924 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 925 "Options string passed to disassembler.so") \ 926 \ 927 diagnostic(bool, PrintNMethods, false, \ 928 "Print assembly code for nmethods when generated") \ 929 \ 930 diagnostic(bool, PrintNativeNMethods, false, \ 931 "Print assembly code for native nmethods when generated") \ 932 \ 933 develop(bool, PrintDebugInfo, false, \ 934 "Print debug information for all nmethods when generated") \ 935 \ 936 develop(bool, PrintRelocations, false, \ 937 "Print relocation information for all nmethods when generated") \ 938 \ 939 develop(bool, PrintDependencies, false, \ 940 "Print dependency information for all nmethods when generated") \ 941 \ 942 develop(bool, PrintExceptionHandlers, false, \ 943 "Print exception handler tables for all nmethods when generated") \ 944 \ 945 develop(bool, InterceptOSException, false, \ 946 "Starts debugger when an implicit OS (e.g., NULL) " \ 947 "exception happens") \ 948 \ 949 notproduct(bool, PrintCodeCache, false, \ 950 "Print the compiled_code cache when exiting") \ 951 \ 952 develop(bool, PrintCodeCache2, false, \ 953 "Print detailed info on the compiled_code cache when exiting") \ 954 \ 955 diagnostic(bool, PrintStubCode, false, \ 956 "Print generated stub code") \ 957 \ 958 product(bool, StackTraceInThrowable, true, \ 959 "Collect backtrace in throwable when exception happens") \ 960 \ 961 product(bool, OmitStackTraceInFastThrow, true, \ 962 "Omit backtraces for some 'hot' exceptions in optimized code") \ 963 \ 964 product(bool, ProfilerPrintByteCodeStatistics, false, \ 965 "Prints byte code statictics when dumping profiler output") \ 966 \ 967 product(bool, ProfilerRecordPC, false, \ 968 "Collects tick for each 16 byte interval of compiled code") \ 969 \ 970 product(bool, ProfileVM, false, \ 971 "Profiles ticks that fall within VM (either in the VM Thread " \ 972 "or VM code called through stubs)") \ 973 \ 974 product(bool, ProfileIntervals, false, \ 975 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 976 \ 977 notproduct(bool, ProfilerCheckIntervals, false, \ 978 "Collect and print info on spacing of profiler ticks") \ 979 \ 980 develop(bool, PrintJVMWarnings, false, \ 981 "Prints warnings for unimplemented JVM functions") \ 982 \ 983 product(bool, PrintWarnings, true, \ 984 "Prints JVM warnings to output stream") \ 985 \ 986 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 987 "Prints warnings for stalled SpinLocks") \ 988 \ 989 develop(bool, InitializeJavaLangSystem, true, \ 990 "Initialize java.lang.System - turn off for individual " \ 991 "method debugging") \ 992 \ 993 develop(bool, InitializeJavaLangString, true, \ 994 "Initialize java.lang.String - turn off for individual " \ 995 "method debugging") \ 996 \ 997 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 998 "Initialize various error and exception classes - turn off for " \ 999 "individual method debugging") \ 1000 \ 1001 product(bool, RegisterFinalizersAtInit, true, \ 1002 "Register finalizable objects at end of Object.<init> or " \ 1003 "after allocation") \ 1004 \ 1005 develop(bool, RegisterReferences, true, \ 1006 "Tells whether the VM should register soft/weak/final/phantom " \ 1007 "references") \ 1008 \ 1009 develop(bool, IgnoreRewrites, false, \ 1010 "Supress rewrites of bytecodes in the oopmap generator. " \ 1011 "This is unsafe!") \ 1012 \ 1013 develop(bool, PrintCodeCacheExtension, false, \ 1014 "Print extension of code cache") \ 1015 \ 1016 develop(bool, UsePrivilegedStack, true, \ 1017 "Enable the security JVM functions") \ 1018 \ 1019 develop(bool, IEEEPrecision, true, \ 1020 "Enables IEEE precision (for INTEL only)") \ 1021 \ 1022 develop(bool, ProtectionDomainVerification, true, \ 1023 "Verifies protection domain before resolution in system " \ 1024 "dictionary") \ 1025 \ 1026 product(bool, ClassUnloading, true, \ 1027 "Do unloading of classes") \ 1028 \ 1029 diagnostic(bool, LinkWellKnownClasses, false, \ 1030 "Resolve a well known class as soon as its name is seen") \ 1031 \ 1032 develop(bool, DisableStartThread, false, \ 1033 "Disable starting of additional Java threads " \ 1034 "(for debugging only)") \ 1035 \ 1036 develop(bool, MemProfiling, false, \ 1037 "Write memory usage profiling to log file") \ 1038 \ 1039 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1040 "Prints the system dictionary at exit") \ 1041 \ 1042 diagnostic(bool, UnsyncloadClass, false, \ 1043 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1044 "class loader must call VM synchronized for findClass " \ 1045 "and defineClass.") \ 1046 \ 1047 product(bool, AlwaysLockClassLoader, false, \ 1048 "Require the VM to acquire the class loader lock before calling " \ 1049 "loadClass() even for class loaders registering " \ 1050 "as parallel capable") \ 1051 \ 1052 product(bool, AllowParallelDefineClass, false, \ 1053 "Allow parallel defineClass requests for class loaders " \ 1054 "registering as parallel capable") \ 1055 \ 1056 product(bool, MustCallLoadClassInternal, false, \ 1057 "Call loadClassInternal() rather than loadClass()") \ 1058 \ 1059 product_pd(bool, DontYieldALot, \ 1060 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1061 \ 1062 product_pd(bool, ConvertSleepToYield, \ 1063 "Converts sleep(0) to thread yield " \ 1064 "(may be off for SOLARIS to improve GUI)") \ 1065 \ 1066 product(bool, ConvertYieldToSleep, false, \ 1067 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1068 "behavior (SOLARIS only)") \ 1069 \ 1070 product(bool, UseBoundThreads, true, \ 1071 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1072 \ 1073 develop(bool, UseDetachedThreads, true, \ 1074 "Use detached threads that are recycled upon termination " \ 1075 "(for SOLARIS only)") \ 1076 \ 1077 product(bool, UseLWPSynchronization, true, \ 1078 "Use LWP-based instead of libthread-based synchronization " \ 1079 "(SPARC only)") \ 1080 \ 1081 product(ccstr, SyncKnobs, NULL, \ 1082 "(Unstable) Various monitor synchronization tunables") \ 1083 \ 1084 product(intx, EmitSync, 0, \ 1085 "(Unsafe,Unstable) " \ 1086 " Controls emission of inline sync fast-path code") \ 1087 \ 1088 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1089 \ 1090 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1091 \ 1092 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1093 \ 1094 product(intx, Atomics, 0, \ 1095 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1096 \ 1097 product(intx, FenceInstruction, 0, \ 1098 "(Unsafe,Unstable) Experimental") \ 1099 \ 1100 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1101 \ 1102 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1103 \ 1104 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1105 \ 1106 product(intx, hashCode, 0, \ 1107 "(Unstable) select hashCode generation algorithm" ) \ 1108 \ 1109 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1110 "(Unstable, Linux-specific)" \ 1111 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1112 \ 1113 product(bool, FilterSpuriousWakeups, true, \ 1114 "Prevent spurious or premature wakeups from object.wait " \ 1115 "(Solaris only)") \ 1116 \ 1117 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1118 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1119 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1120 \ 1121 develop(bool, UsePthreads, false, \ 1122 "Use pthread-based instead of libthread-based synchronization " \ 1123 "(SPARC only)") \ 1124 \ 1125 product(bool, AdjustConcurrency, false, \ 1126 "call thr_setconcurrency at thread create time to avoid " \ 1127 "LWP starvation on MP systems (For Solaris Only)") \ 1128 \ 1129 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1130 "Should the system attempt to update the compiler file when " \ 1131 "an error occurs?") \ 1132 \ 1133 product(bool, ReduceSignalUsage, false, \ 1134 "Reduce the use of OS signals in Java and/or the VM") \ 1135 \ 1136 notproduct(bool, ValidateMarkSweep, false, \ 1137 "Do extra validation during MarkSweep collection") \ 1138 \ 1139 notproduct(bool, RecordMarkSweepCompaction, false, \ 1140 "Enable GC-to-GC recording and querying of compaction during " \ 1141 "MarkSweep") \ 1142 \ 1143 develop_pd(bool, ShareVtableStubs, \ 1144 "Share vtable stubs (smaller code but worse branch prediction") \ 1145 \ 1146 develop(bool, LoadLineNumberTables, true, \ 1147 "Tells whether the class file parser loads line number tables") \ 1148 \ 1149 develop(bool, LoadLocalVariableTables, true, \ 1150 "Tells whether the class file parser loads local variable tables")\ 1151 \ 1152 develop(bool, LoadLocalVariableTypeTables, true, \ 1153 "Tells whether the class file parser loads local variable type tables")\ 1154 \ 1155 product(bool, AllowUserSignalHandlers, false, \ 1156 "Do not complain if the application installs signal handlers " \ 1157 "(Solaris & Linux only)") \ 1158 \ 1159 product(bool, UseSignalChaining, true, \ 1160 "Use signal-chaining to invoke signal handlers installed " \ 1161 "by the application (Solaris & Linux only)") \ 1162 \ 1163 product(bool, UseAltSigs, false, \ 1164 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1165 "internal signals (Solaris only)") \ 1166 \ 1167 product(bool, UseSpinning, false, \ 1168 "Use spinning in monitor inflation and before entry") \ 1169 \ 1170 product(bool, PreSpinYield, false, \ 1171 "Yield before inner spinning loop") \ 1172 \ 1173 product(bool, PostSpinYield, true, \ 1174 "Yield after inner spinning loop") \ 1175 \ 1176 product(bool, AllowJNIEnvProxy, false, \ 1177 "Allow JNIEnv proxies for jdbx") \ 1178 \ 1179 product(bool, JNIDetachReleasesMonitors, true, \ 1180 "JNI DetachCurrentThread releases monitors owned by thread") \ 1181 \ 1182 product(bool, RestoreMXCSROnJNICalls, false, \ 1183 "Restore MXCSR when returning from JNI calls") \ 1184 \ 1185 product(bool, CheckJNICalls, false, \ 1186 "Verify all arguments to JNI calls") \ 1187 \ 1188 product(bool, UseFastJNIAccessors, true, \ 1189 "Use optimized versions of Get<Primitive>Field") \ 1190 \ 1191 product(bool, EagerXrunInit, false, \ 1192 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1193 " but not all -Xrun libraries may support the state of the VM at this time") \ 1194 \ 1195 product(bool, PreserveAllAnnotations, false, \ 1196 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1197 \ 1198 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1199 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1200 \ 1201 product(bool, LazyBootClassLoader, true, \ 1202 "Enable/disable lazy opening of boot class path entries") \ 1203 \ 1204 diagnostic(bool, UseIncDec, true, \ 1205 "Use INC, DEC instructions on x86") \ 1206 \ 1207 product(bool, UseNewLongLShift, false, \ 1208 "Use optimized bitwise shift left") \ 1209 \ 1210 product(bool, UseStoreImmI16, true, \ 1211 "Use store immediate 16-bits value instruction on x86") \ 1212 \ 1213 product(bool, UseAddressNop, false, \ 1214 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1215 \ 1216 product(bool, UseXmmLoadAndClearUpper, true, \ 1217 "Load low part of XMM register and clear upper part") \ 1218 \ 1219 product(bool, UseXmmRegToRegMoveAll, false, \ 1220 "Copy all XMM register bits when moving value between registers") \ 1221 \ 1222 product(bool, UseXmmI2D, false, \ 1223 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1224 \ 1225 product(bool, UseXmmI2F, false, \ 1226 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1227 \ 1228 product(bool, UseXMMForArrayCopy, false, \ 1229 "Use SSE2 MOVQ instruction for Arraycopy") \ 1230 \ 1231 product(bool, UseUnalignedLoadStores, false, \ 1232 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1233 \ 1234 product(bool, UseCBCond, false, \ 1235 "Use compare and branch instruction on SPARC") \ 1236 \ 1237 product(intx, FieldsAllocationStyle, 1, \ 1238 "0 - type based with oops first, 1 - with oops last, " \ 1239 "2 - oops in super and sub classes are together") \ 1240 \ 1241 product(bool, CompactFields, true, \ 1242 "Allocate nonstatic fields in gaps between previous fields") \ 1243 \ 1244 notproduct(bool, PrintCompactFieldsSavings, false, \ 1245 "Print how many words were saved with CompactFields") \ 1246 \ 1247 product(bool, UseBiasedLocking, true, \ 1248 "Enable biased locking in JVM") \ 1249 \ 1250 product(intx, BiasedLockingStartupDelay, 4000, \ 1251 "Number of milliseconds to wait before enabling biased locking") \ 1252 \ 1253 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1254 "Print statistics of biased locking in JVM") \ 1255 \ 1256 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1257 "Threshold of number of revocations per type to try to " \ 1258 "rebias all objects in the heap of that type") \ 1259 \ 1260 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1261 "Threshold of number of revocations per type to permanently " \ 1262 "revoke biases of all objects in the heap of that type") \ 1263 \ 1264 product(intx, BiasedLockingDecayTime, 25000, \ 1265 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1266 "type after previous bulk rebias") \ 1267 \ 1268 develop(bool, JavaObjectsInPerm, false, \ 1269 "controls whether Classes and interned Strings are allocated" \ 1270 "in perm. This purely intended to allow debugging issues" \ 1271 "in production.") \ 1272 \ 1273 /* tracing */ \ 1274 \ 1275 notproduct(bool, TraceRuntimeCalls, false, \ 1276 "Trace run-time calls") \ 1277 \ 1278 develop(bool, TraceJNICalls, false, \ 1279 "Trace JNI calls") \ 1280 \ 1281 notproduct(bool, TraceJVMCalls, false, \ 1282 "Trace JVM calls") \ 1283 \ 1284 product(ccstr, TraceJVMTI, NULL, \ 1285 "Trace flags for JVMTI functions and events") \ 1286 \ 1287 /* This option can change an EMCP method into an obsolete method. */ \ 1288 /* This can affect tests that except specific methods to be EMCP. */ \ 1289 /* This option should be used with caution. */ \ 1290 product(bool, StressLdcRewrite, false, \ 1291 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1292 \ 1293 product(intx, TraceRedefineClasses, 0, \ 1294 "Trace level for JVMTI RedefineClasses") \ 1295 \ 1296 develop(bool, StressMethodComparator, false, \ 1297 "run the MethodComparator on all loaded methods") \ 1298 \ 1299 /* change to false by default sometime after Mustang */ \ 1300 product(bool, VerifyMergedCPBytecodes, true, \ 1301 "Verify bytecodes after RedefineClasses constant pool merging") \ 1302 \ 1303 develop(bool, TraceJNIHandleAllocation, false, \ 1304 "Trace allocation/deallocation of JNI handle blocks") \ 1305 \ 1306 develop(bool, TraceThreadEvents, false, \ 1307 "Trace all thread events") \ 1308 \ 1309 develop(bool, TraceBytecodes, false, \ 1310 "Trace bytecode execution") \ 1311 \ 1312 develop(bool, TraceClassInitialization, false, \ 1313 "Trace class initialization") \ 1314 \ 1315 develop(bool, TraceExceptions, false, \ 1316 "Trace exceptions") \ 1317 \ 1318 develop(bool, TraceICs, false, \ 1319 "Trace inline cache changes") \ 1320 \ 1321 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1322 "Trace method invocation counter overflow") \ 1323 \ 1324 develop(bool, TraceInlineCacheClearing, false, \ 1325 "Trace clearing of inline caches in nmethods") \ 1326 \ 1327 develop(bool, TraceDependencies, false, \ 1328 "Trace dependencies") \ 1329 \ 1330 develop(bool, VerifyDependencies, trueInDebug, \ 1331 "Exercise and verify the compilation dependency mechanism") \ 1332 \ 1333 develop(bool, TraceNewOopMapGeneration, false, \ 1334 "Trace OopMapGeneration") \ 1335 \ 1336 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1337 "Trace OopMapGeneration: print detailed cell states") \ 1338 \ 1339 develop(bool, TimeOopMap, false, \ 1340 "Time calls to GenerateOopMap::compute_map() in sum") \ 1341 \ 1342 develop(bool, TimeOopMap2, false, \ 1343 "Time calls to GenerateOopMap::compute_map() individually") \ 1344 \ 1345 develop(bool, TraceMonitorMismatch, false, \ 1346 "Trace monitor matching failures during OopMapGeneration") \ 1347 \ 1348 develop(bool, TraceOopMapRewrites, false, \ 1349 "Trace rewritting of method oops during oop map generation") \ 1350 \ 1351 develop(bool, TraceSafepoint, false, \ 1352 "Trace safepoint operations") \ 1353 \ 1354 develop(bool, TraceICBuffer, false, \ 1355 "Trace usage of IC buffer") \ 1356 \ 1357 develop(bool, TraceCompiledIC, false, \ 1358 "Trace changes of compiled IC") \ 1359 \ 1360 notproduct(bool, TraceZapDeadLocals, false, \ 1361 "Trace zapping dead locals") \ 1362 \ 1363 develop(bool, TraceStartupTime, false, \ 1364 "Trace setup time") \ 1365 \ 1366 product(ccstr, HPILibPath, NULL, \ 1367 "Specify alternate path to HPI library") \ 1368 \ 1369 develop(bool, TraceProtectionDomainVerification, false, \ 1370 "Trace protection domain verifcation") \ 1371 \ 1372 develop(bool, TraceClearedExceptions, false, \ 1373 "Prints when an exception is forcibly cleared") \ 1374 \ 1375 product(bool, TraceClassResolution, false, \ 1376 "Trace all constant pool resolutions (for debugging)") \ 1377 \ 1378 product(bool, TraceBiasedLocking, false, \ 1379 "Trace biased locking in JVM") \ 1380 \ 1381 product(bool, TraceMonitorInflation, false, \ 1382 "Trace monitor inflation in JVM") \ 1383 \ 1384 /* assembler */ \ 1385 product(bool, Use486InstrsOnly, false, \ 1386 "Use 80486 Compliant instruction subset") \ 1387 \ 1388 /* gc */ \ 1389 \ 1390 product(bool, UseSerialGC, false, \ 1391 "Use the serial garbage collector") \ 1392 \ 1393 product(bool, UseG1GC, false, \ 1394 "Use the Garbage-First garbage collector") \ 1395 \ 1396 product(bool, UseParallelGC, false, \ 1397 "Use the Parallel Scavenge garbage collector") \ 1398 \ 1399 product(bool, UseParallelOldGC, false, \ 1400 "Use the Parallel Old garbage collector") \ 1401 \ 1402 product(uintx, HeapMaximumCompactionInterval, 20, \ 1403 "How often should we maximally compact the heap (not allowing " \ 1404 "any dead space)") \ 1405 \ 1406 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1407 "The collection count for the first maximum compaction") \ 1408 \ 1409 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1410 "In the Parallel Old garbage collector maximum compaction for " \ 1411 "a system GC") \ 1412 \ 1413 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1414 "The mean used by the par compact dead wood" \ 1415 "limiter (a number between 0-100).") \ 1416 \ 1417 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1418 "The standard deviation used by the par compact dead wood" \ 1419 "limiter (a number between 0-100).") \ 1420 \ 1421 product(uintx, ParallelGCThreads, 0, \ 1422 "Number of parallel threads parallel gc will use") \ 1423 \ 1424 product(bool, UseDynamicNumberOfGCThreads, false, \ 1425 "Dynamically choose the number of parallel threads " \ 1426 "parallel gc will use") \ 1427 \ 1428 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1429 "Force dynamic selection of the number of" \ 1430 "parallel threads parallel gc will use to aid debugging") \ 1431 \ 1432 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1433 "Size of heap (bytes) per GC thread used in calculating the " \ 1434 "number of GC threads") \ 1435 \ 1436 product(bool, TraceDynamicGCThreads, false, \ 1437 "Trace the dynamic GC thread usage") \ 1438 \ 1439 develop(bool, ParallelOldGCSplitALot, false, \ 1440 "Provoke splitting (copying data from a young gen space to" \ 1441 "multiple destination spaces)") \ 1442 \ 1443 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1444 "How often to provoke splitting a young gen space") \ 1445 \ 1446 develop(bool, TraceRegionTasksQueuing, false, \ 1447 "Trace the queuing of the region tasks") \ 1448 \ 1449 product(uintx, ConcGCThreads, 0, \ 1450 "Number of threads concurrent gc will use") \ 1451 \ 1452 product(uintx, YoungPLABSize, 4096, \ 1453 "Size of young gen promotion labs (in HeapWords)") \ 1454 \ 1455 product(uintx, OldPLABSize, 1024, \ 1456 "Size of old gen promotion labs (in HeapWords)") \ 1457 \ 1458 product(uintx, GCTaskTimeStampEntries, 200, \ 1459 "Number of time stamp entries per gc worker thread") \ 1460 \ 1461 product(bool, AlwaysTenure, false, \ 1462 "Always tenure objects in eden. (ParallelGC only)") \ 1463 \ 1464 product(bool, NeverTenure, false, \ 1465 "Never tenure objects in eden, May tenure on overflow " \ 1466 "(ParallelGC only)") \ 1467 \ 1468 product(bool, ScavengeBeforeFullGC, true, \ 1469 "Scavenge youngest generation before each full GC, " \ 1470 "used with UseParallelGC") \ 1471 \ 1472 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1473 "Allow scavenges to occur when to_space contains objects.") \ 1474 \ 1475 product(bool, UseConcMarkSweepGC, false, \ 1476 "Use Concurrent Mark-Sweep GC in the old generation") \ 1477 \ 1478 product(bool, ExplicitGCInvokesConcurrent, false, \ 1479 "A System.gc() request invokes a concurrent collection;" \ 1480 " (effective only when UseConcMarkSweepGC)") \ 1481 \ 1482 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1483 "A System.gc() request invokes a concurrent collection and " \ 1484 "also unloads classes during such a concurrent gc cycle " \ 1485 "(effective only when UseConcMarkSweepGC)") \ 1486 \ 1487 product(bool, GCLockerInvokesConcurrent, false, \ 1488 "The exit of a JNI CS necessitating a scavenge also" \ 1489 " kicks off a bkgrd concurrent collection") \ 1490 \ 1491 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1492 "How much the GC can expand the eden by while the GC locker " \ 1493 "is active (as a percentage)") \ 1494 \ 1495 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1496 "Use Adaptive Free Lists in the CMS generation") \ 1497 \ 1498 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1499 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1500 \ 1501 develop(bool, RotateCMSCollectionTypes, false, \ 1502 "Rotate the CMS collections among concurrent and STW") \ 1503 \ 1504 product(bool, UseCMSBestFit, true, \ 1505 "Use CMS best fit allocation strategy") \ 1506 \ 1507 product(bool, UseCMSCollectionPassing, true, \ 1508 "Use passing of collection from background to foreground") \ 1509 \ 1510 product(bool, UseParNewGC, false, \ 1511 "Use parallel threads in the new generation.") \ 1512 \ 1513 product(bool, ParallelGCVerbose, false, \ 1514 "Verbose output for parallel GC.") \ 1515 \ 1516 product(intx, ParallelGCBufferWastePct, 10, \ 1517 "wasted fraction of parallel allocation buffer.") \ 1518 \ 1519 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1520 "Retain parallel allocation buffers across scavenges; " \ 1521 " -- disabled because this currently conflicts with " \ 1522 " parallel card scanning under certain conditions ") \ 1523 \ 1524 product(intx, TargetPLABWastePct, 10, \ 1525 "target wasted space in last buffer as pct of overall allocation")\ 1526 \ 1527 product(uintx, PLABWeight, 75, \ 1528 "Percentage (0-100) used to weight the current sample when" \ 1529 "computing exponentially decaying average for ResizePLAB.") \ 1530 \ 1531 product(bool, ResizePLAB, true, \ 1532 "Dynamically resize (survivor space) promotion labs") \ 1533 \ 1534 product(bool, PrintPLAB, false, \ 1535 "Print (survivor space) promotion labs sizing decisions") \ 1536 \ 1537 product(intx, ParGCArrayScanChunk, 50, \ 1538 "Scan a subset and push remainder, if array is bigger than this") \ 1539 \ 1540 product(bool, ParGCUseLocalOverflow, false, \ 1541 "Instead of a global overflow list, use local overflow stacks") \ 1542 \ 1543 product(bool, ParGCTrimOverflow, true, \ 1544 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1545 \ 1546 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1547 "Whether we should simulate work queue overflow in ParNew") \ 1548 \ 1549 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1550 "An `interval' counter that determines how frequently " \ 1551 "we simulate overflow; a smaller number increases frequency") \ 1552 \ 1553 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1554 "The desired number of objects to claim from the overflow list") \ 1555 \ 1556 diagnostic(intx, ParGCStridesPerThread, 2, \ 1557 "The number of strides per worker thread that we divide up the " \ 1558 "card table scanning work into") \ 1559 \ 1560 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1561 "The number of cards in each chunk of the parallel chunks used " \ 1562 "during card table scanning") \ 1563 \ 1564 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1565 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1566 "parallel GC.") \ 1567 \ 1568 product(uintx, OldPLABWeight, 50, \ 1569 "Percentage (0-100) used to weight the current sample when" \ 1570 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1571 \ 1572 product(bool, ResizeOldPLAB, true, \ 1573 "Dynamically resize (old gen) promotion labs") \ 1574 \ 1575 product(bool, PrintOldPLAB, false, \ 1576 "Print (old gen) promotion labs sizing decisions") \ 1577 \ 1578 product(uintx, CMSOldPLABMin, 16, \ 1579 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1580 \ 1581 product(uintx, CMSOldPLABMax, 1024, \ 1582 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1583 \ 1584 product(uintx, CMSOldPLABNumRefills, 4, \ 1585 "Nominal number of refills of CMS gen promotion lab cache" \ 1586 " per worker per block size") \ 1587 \ 1588 product(bool, CMSOldPLABResizeQuicker, false, \ 1589 "Whether to react on-the-fly during a scavenge to a sudden" \ 1590 " change in block demand rate") \ 1591 \ 1592 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1593 "The tolerance of the phase-change detector for on-the-fly" \ 1594 " PLAB resizing during a scavenge") \ 1595 \ 1596 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1597 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1598 " during a scavenge") \ 1599 \ 1600 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1601 "The clamping of the gain in the feedback loop for on-the-fly" \ 1602 " PLAB resizing during a scavenge") \ 1603 \ 1604 product(bool, AlwaysPreTouch, false, \ 1605 "It forces all freshly committed pages to be pre-touched.") \ 1606 \ 1607 product_pd(intx, CMSYoungGenPerWorker, \ 1608 "The maximum size of young gen chosen by default per GC worker " \ 1609 "thread available") \ 1610 \ 1611 product(bool, GCOverheadReporting, false, \ 1612 "Enables the GC overhead reporting facility") \ 1613 \ 1614 product(intx, GCOverheadReportingPeriodMS, 100, \ 1615 "Reporting period for conc GC overhead reporting, in ms ") \ 1616 \ 1617 product(bool, CMSIncrementalMode, false, \ 1618 "Whether CMS GC should operate in \"incremental\" mode") \ 1619 \ 1620 product(uintx, CMSIncrementalDutyCycle, 10, \ 1621 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1622 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1623 "value") \ 1624 \ 1625 product(bool, CMSIncrementalPacing, true, \ 1626 "Whether the CMS incremental mode duty cycle should be " \ 1627 "automatically adjusted") \ 1628 \ 1629 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1630 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1631 "enabled (a percentage, 0-100)") \ 1632 \ 1633 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1634 "Percentage (0-100) used to add conservatism when computing the " \ 1635 "duty cycle") \ 1636 \ 1637 product(uintx, CMSIncrementalOffset, 0, \ 1638 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1639 " is shifted to the right within the period between young GCs") \ 1640 \ 1641 product(uintx, CMSExpAvgFactor, 50, \ 1642 "Percentage (0-100) used to weight the current sample when" \ 1643 "computing exponential averages for CMS statistics.") \ 1644 \ 1645 product(uintx, CMS_FLSWeight, 75, \ 1646 "Percentage (0-100) used to weight the current sample when" \ 1647 "computing exponentially decating averages for CMS FLS statistics.") \ 1648 \ 1649 product(uintx, CMS_FLSPadding, 1, \ 1650 "The multiple of deviation from mean to use for buffering" \ 1651 "against volatility in free list demand.") \ 1652 \ 1653 product(uintx, FLSCoalescePolicy, 2, \ 1654 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1655 \ 1656 product(bool, FLSAlwaysCoalesceLarge, false, \ 1657 "CMS: Larger free blocks are always available for coalescing") \ 1658 \ 1659 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1660 "CMS: the smaller the percentage the greater the coalition force")\ 1661 \ 1662 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1663 "CMS: the factor by which to inflate estimated demand of small" \ 1664 " block sizes to prevent coalescing with an adjoining block") \ 1665 \ 1666 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1667 "CMS: the factor by which to inflate estimated demand of large" \ 1668 " block sizes to prevent coalescing with an adjoining block") \ 1669 \ 1670 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1671 "CMS: the factor by which to inflate estimated demand of small" \ 1672 " block sizes to prevent splitting to supply demand for smaller" \ 1673 " blocks") \ 1674 \ 1675 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1676 "CMS: the factor by which to inflate estimated demand of large" \ 1677 " block sizes to prevent splitting to supply demand for smaller" \ 1678 " blocks") \ 1679 \ 1680 product(bool, CMSExtrapolateSweep, false, \ 1681 "CMS: cushion for block demand during sweep") \ 1682 \ 1683 product(uintx, CMS_SweepWeight, 75, \ 1684 "Percentage (0-100) used to weight the current sample when " \ 1685 "computing exponentially decaying average for inter-sweep " \ 1686 "duration") \ 1687 \ 1688 product(uintx, CMS_SweepPadding, 1, \ 1689 "The multiple of deviation from mean to use for buffering " \ 1690 "against volatility in inter-sweep duration.") \ 1691 \ 1692 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1693 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1694 "duration exceeds this threhold in milliseconds") \ 1695 \ 1696 develop(bool, CMSTraceIncrementalMode, false, \ 1697 "Trace CMS incremental mode") \ 1698 \ 1699 develop(bool, CMSTraceIncrementalPacing, false, \ 1700 "Trace CMS incremental mode pacing computation") \ 1701 \ 1702 develop(bool, CMSTraceThreadState, false, \ 1703 "Trace the CMS thread state (enable the trace_state() method)") \ 1704 \ 1705 product(bool, CMSClassUnloadingEnabled, false, \ 1706 "Whether class unloading enabled when using CMS GC") \ 1707 \ 1708 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1709 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1710 " for which classes may not be unloaded") \ 1711 \ 1712 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1713 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1714 \ 1715 product(bool, UseCMSCompactAtFullCollection, true, \ 1716 "Use mark sweep compact at full collections") \ 1717 \ 1718 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1719 "Number of CMS full collection done before compaction if > 0") \ 1720 \ 1721 develop(intx, CMSDictionaryChoice, 0, \ 1722 "Use BinaryTreeDictionary as default in the CMS generation") \ 1723 \ 1724 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1725 "Replenish an indexed free list with this number of chunks") \ 1726 \ 1727 product(bool, CMSReplenishIntermediate, true, \ 1728 "Replenish all intermediate free-list caches") \ 1729 \ 1730 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1731 "When satisfying batched demand, split blocks from the " \ 1732 "IndexedFreeList whose size is a multiple of requested size") \ 1733 \ 1734 product(bool, CMSLoopWarn, false, \ 1735 "Warn in case of excessive CMS looping") \ 1736 \ 1737 develop(bool, CMSOverflowEarlyRestoration, false, \ 1738 "Whether preserved marks should be restored early") \ 1739 \ 1740 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1741 "Size of marking stack") \ 1742 \ 1743 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1744 "Max size of marking stack") \ 1745 \ 1746 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1747 "Whether we should simulate frequent marking stack / work queue" \ 1748 " overflow") \ 1749 \ 1750 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1751 "An `interval' counter that determines how frequently" \ 1752 " we simulate overflow; a smaller number increases frequency") \ 1753 \ 1754 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1755 "(Temporary, subject to experimentation)" \ 1756 "Maximum number of abortable preclean iterations, if > 0") \ 1757 \ 1758 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1759 "(Temporary, subject to experimentation)" \ 1760 "Maximum time in abortable preclean in ms") \ 1761 \ 1762 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1763 "(Temporary, subject to experimentation)" \ 1764 "Nominal minimum work per abortable preclean iteration") \ 1765 \ 1766 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1767 "(Temporary, subject to experimentation)" \ 1768 " Time that we sleep between iterations when not given" \ 1769 " enough work per iteration") \ 1770 \ 1771 product(uintx, CMSRescanMultiple, 32, \ 1772 "Size (in cards) of CMS parallel rescan task") \ 1773 \ 1774 product(uintx, CMSConcMarkMultiple, 32, \ 1775 "Size (in cards) of CMS concurrent MT marking task") \ 1776 \ 1777 product(uintx, CMSRevisitStackSize, 1*M, \ 1778 "Size of CMS KlassKlass revisit stack") \ 1779 \ 1780 product(bool, CMSAbortSemantics, false, \ 1781 "Whether abort-on-overflow semantics is implemented") \ 1782 \ 1783 product(bool, CMSParallelRemarkEnabled, true, \ 1784 "Whether parallel remark enabled (only if ParNewGC)") \ 1785 \ 1786 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1787 "Whether parallel remark of survivor space" \ 1788 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1789 \ 1790 product(bool, CMSPLABRecordAlways, true, \ 1791 "Whether to always record survivor space PLAB bdries" \ 1792 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1793 \ 1794 product(bool, CMSConcurrentMTEnabled, true, \ 1795 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1796 \ 1797 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1798 "Whether concurrent precleaning enabled in perm gen" \ 1799 " (effective only when CMSPrecleaningEnabled is true)") \ 1800 \ 1801 product(bool, CMSPrecleaningEnabled, true, \ 1802 "Whether concurrent precleaning enabled") \ 1803 \ 1804 product(uintx, CMSPrecleanIter, 3, \ 1805 "Maximum number of precleaning iteration passes") \ 1806 \ 1807 product(uintx, CMSPrecleanNumerator, 2, \ 1808 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1809 " ratio") \ 1810 \ 1811 product(uintx, CMSPrecleanDenominator, 3, \ 1812 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1813 " ratio") \ 1814 \ 1815 product(bool, CMSPrecleanRefLists1, true, \ 1816 "Preclean ref lists during (initial) preclean phase") \ 1817 \ 1818 product(bool, CMSPrecleanRefLists2, false, \ 1819 "Preclean ref lists during abortable preclean phase") \ 1820 \ 1821 product(bool, CMSPrecleanSurvivors1, false, \ 1822 "Preclean survivors during (initial) preclean phase") \ 1823 \ 1824 product(bool, CMSPrecleanSurvivors2, true, \ 1825 "Preclean survivors during abortable preclean phase") \ 1826 \ 1827 product(uintx, CMSPrecleanThreshold, 1000, \ 1828 "Don't re-iterate if #dirty cards less than this") \ 1829 \ 1830 product(bool, CMSCleanOnEnter, true, \ 1831 "Clean-on-enter optimization for reducing number of dirty cards") \ 1832 \ 1833 product(uintx, CMSRemarkVerifyVariant, 1, \ 1834 "Choose variant (1,2) of verification following remark") \ 1835 \ 1836 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1837 "If Eden used is below this value, don't try to schedule remark") \ 1838 \ 1839 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1840 "The Eden occupancy % at which to try and schedule remark pause") \ 1841 \ 1842 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1843 "Start sampling Eden top at least before yg occupancy reaches" \ 1844 " 1/<ratio> of the size at which we plan to schedule remark") \ 1845 \ 1846 product(uintx, CMSSamplingGrain, 16*K, \ 1847 "The minimum distance between eden samples for CMS (see above)") \ 1848 \ 1849 product(bool, CMSScavengeBeforeRemark, false, \ 1850 "Attempt scavenge before the CMS remark step") \ 1851 \ 1852 develop(bool, CMSTraceSweeper, false, \ 1853 "Trace some actions of the CMS sweeper") \ 1854 \ 1855 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1856 "Don't drain below this size per parallel worker/thief") \ 1857 \ 1858 manageable(intx, CMSWaitDuration, 2000, \ 1859 "Time in milliseconds that CMS thread waits for young GC") \ 1860 \ 1861 product(bool, CMSYield, true, \ 1862 "Yield between steps of concurrent mark & sweep") \ 1863 \ 1864 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1865 "Bitmap operations should process at most this many bits" \ 1866 "between yields") \ 1867 \ 1868 product(bool, CMSDumpAtPromotionFailure, false, \ 1869 "Dump useful information about the state of the CMS old " \ 1870 " generation upon a promotion failure.") \ 1871 \ 1872 product(bool, CMSPrintChunksInDump, false, \ 1873 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1874 " more detailed information about the free chunks.") \ 1875 \ 1876 product(bool, CMSPrintObjectsInDump, false, \ 1877 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1878 " more detailed information about the allocated objects.") \ 1879 \ 1880 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1881 "Verify that all refs across the FLS boundary " \ 1882 " are to valid objects") \ 1883 \ 1884 diagnostic(bool, FLSVerifyLists, false, \ 1885 "Do lots of (expensive) FreeListSpace verification") \ 1886 \ 1887 diagnostic(bool, FLSVerifyIndexTable, false, \ 1888 "Do lots of (expensive) FLS index table verification") \ 1889 \ 1890 develop(bool, FLSVerifyDictionary, false, \ 1891 "Do lots of (expensive) FLS dictionary verification") \ 1892 \ 1893 develop(bool, VerifyBlockOffsetArray, false, \ 1894 "Do (expensive!) block offset array verification") \ 1895 \ 1896 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1897 "Maintain _unallocated_block in BlockOffsetArray" \ 1898 " (currently applicable only to CMS collector)") \ 1899 \ 1900 develop(bool, TraceCMSState, false, \ 1901 "Trace the state of the CMS collection") \ 1902 \ 1903 product(intx, RefDiscoveryPolicy, 0, \ 1904 "Whether reference-based(0) or referent-based(1)") \ 1905 \ 1906 product(bool, ParallelRefProcEnabled, false, \ 1907 "Enable parallel reference processing whenever possible") \ 1908 \ 1909 product(bool, ParallelRefProcBalancingEnabled, true, \ 1910 "Enable balancing of reference processing queues") \ 1911 \ 1912 product(intx, CMSTriggerRatio, 80, \ 1913 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1914 "allocated before a CMS collection cycle commences") \ 1915 \ 1916 product(intx, CMSTriggerPermRatio, 80, \ 1917 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1918 "is allocated before a CMS collection cycle commences, that " \ 1919 "also collects the perm generation") \ 1920 \ 1921 product(uintx, CMSBootstrapOccupancy, 50, \ 1922 "Percentage CMS generation occupancy at which to " \ 1923 "initiate CMS collection for bootstrapping collection stats") \ 1924 \ 1925 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1926 "Percentage CMS generation occupancy to start a CMS collection " \ 1927 "cycle. A negative value means that CMSTriggerRatio is used") \ 1928 \ 1929 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1930 "Percentage of the (entire) heap occupancy to start a " \ 1931 "concurrent GC cycle. It us used by GCs that trigger a " \ 1932 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1933 "not just one of the generations (e.g., G1). A value of 0 " \ 1934 "denotes 'do constant GC cycles'.") \ 1935 \ 1936 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1937 "Percentage CMS perm generation occupancy to start a " \ 1938 "CMScollection cycle. A negative value means that " \ 1939 "CMSTriggerPermRatio is used") \ 1940 \ 1941 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1942 "Only use occupancy as a crierion for starting a CMS collection") \ 1943 \ 1944 product(intx, CMSIsTooFullPercentage, 98, \ 1945 "An absolute ceiling above which CMS will always consider the " \ 1946 "perm gen ripe for collection") \ 1947 \ 1948 develop(bool, CMSTestInFreeList, false, \ 1949 "Check if the coalesced range is already in the " \ 1950 "free lists as claimed") \ 1951 \ 1952 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1953 "Check that all the garbage collected was returned to the " \ 1954 "free lists.") \ 1955 \ 1956 notproduct(bool, ScavengeALot, false, \ 1957 "Force scavenge at every Nth exit from the runtime system " \ 1958 "(N=ScavengeALotInterval)") \ 1959 \ 1960 develop(bool, FullGCALot, false, \ 1961 "Force full gc at every Nth exit from the runtime system " \ 1962 "(N=FullGCALotInterval)") \ 1963 \ 1964 notproduct(bool, GCALotAtAllSafepoints, false, \ 1965 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1966 \ 1967 product(bool, PrintPromotionFailure, false, \ 1968 "Print additional diagnostic information following " \ 1969 " promotion failure") \ 1970 \ 1971 notproduct(bool, PromotionFailureALot, false, \ 1972 "Use promotion failure handling on every youngest generation " \ 1973 "collection") \ 1974 \ 1975 develop(uintx, PromotionFailureALotCount, 1000, \ 1976 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1977 "refill attempts (ParNew) or promotion attempts " \ 1978 "(other young collectors) ") \ 1979 \ 1980 develop(uintx, PromotionFailureALotInterval, 5, \ 1981 "Total collections between promotion failures alot") \ 1982 \ 1983 experimental(intx, WorkStealingSleepMillis, 1, \ 1984 "Sleep time when sleep is used for yields") \ 1985 \ 1986 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1987 "Number of yields before a sleep is done during workstealing") \ 1988 \ 1989 experimental(uintx, WorkStealingHardSpins, 4096, \ 1990 "Number of iterations in a spin loop between checks on " \ 1991 "time out of hard spin") \ 1992 \ 1993 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1994 "Ratio of hard spins to calls to yield") \ 1995 \ 1996 product(uintx, PreserveMarkStackSize, 1024, \ 1997 "Size for stack used in promotion failure handling") \ 1998 \ 1999 develop(uintx, ObjArrayMarkingStride, 512, \ 2000 "Number of ObjArray elements to push onto the marking stack" \ 2001 "before pushing a continuation entry") \ 2002 \ 2003 notproduct(bool, ExecuteInternalVMTests, false, \ 2004 "Enable execution of internal VM tests.") \ 2005 \ 2006 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2007 \ 2008 product_pd(bool, ResizeTLAB, \ 2009 "Dynamically resize tlab size for threads") \ 2010 \ 2011 product(bool, ZeroTLAB, false, \ 2012 "Zero out the newly created TLAB") \ 2013 \ 2014 product(bool, FastTLABRefill, true, \ 2015 "Use fast TLAB refill code") \ 2016 \ 2017 product(bool, PrintTLAB, false, \ 2018 "Print various TLAB related information") \ 2019 \ 2020 product(bool, TLABStats, true, \ 2021 "Print various TLAB related information") \ 2022 \ 2023 product(bool, UseBlockZeroing, false, \ 2024 "Use special cpu instructions for block zeroing") \ 2025 \ 2026 product(intx, BlockZeroingLowLimit, 2048, \ 2027 "Minimum size in bytes when block zeroing will be used") \ 2028 \ 2029 product(bool, UseBlockCopy, false, \ 2030 "Use special cpu instructions for block copy") \ 2031 \ 2032 product(intx, BlockCopyLowLimit, 2048, \ 2033 "Minimum size in bytes when block copy will be used") \ 2034 \ 2035 product(bool, PrintRevisitStats, false, \ 2036 "Print revisit (klass and MDO) stack related information") \ 2037 \ 2038 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2039 "Enable LowMemoryProtection")) \ 2040 \ 2041 product_pd(bool, NeverActAsServerClassMachine, \ 2042 "Never act like a server-class machine") \ 2043 \ 2044 product(bool, AlwaysActAsServerClassMachine, false, \ 2045 "Always act like a server-class machine") \ 2046 \ 2047 product_pd(uint64_t, MaxRAM, \ 2048 "Real memory size (in bytes) used to set maximum heap size") \ 2049 \ 2050 product(uintx, ErgoHeapSizeLimit, 0, \ 2051 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2052 "MaxRAM / MaxRAMFraction") \ 2053 \ 2054 product(uintx, MaxRAMFraction, 4, \ 2055 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2056 "size") \ 2057 \ 2058 product(uintx, DefaultMaxRAMFraction, 4, \ 2059 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2060 "size; deprecated: to be renamed to MaxRAMFraction") \ 2061 \ 2062 product(uintx, MinRAMFraction, 2, \ 2063 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2064 "size on systems with small physical memory size") \ 2065 \ 2066 product(uintx, InitialRAMFraction, 64, \ 2067 "Fraction (1/n) of real memory used for initial heap size") \ 2068 \ 2069 product(bool, UseAutoGCSelectPolicy, false, \ 2070 "Use automatic collection selection policy") \ 2071 \ 2072 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2073 "Automatic GC selection pause threshhold in ms") \ 2074 \ 2075 product(bool, UseAdaptiveSizePolicy, true, \ 2076 "Use adaptive generation sizing policies") \ 2077 \ 2078 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2079 "Use adaptive survivor sizing policies") \ 2080 \ 2081 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2082 "Use adaptive young-old sizing policies at minor collections") \ 2083 \ 2084 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2085 "Use adaptive young-old sizing policies at major collections") \ 2086 \ 2087 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2088 "Use statistics from System.GC for adaptive size policy") \ 2089 \ 2090 product(bool, UseAdaptiveGCBoundary, false, \ 2091 "Allow young-old boundary to move") \ 2092 \ 2093 develop(bool, TraceAdaptiveGCBoundary, false, \ 2094 "Trace young-old boundary moves") \ 2095 \ 2096 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2097 "Resize the virtual spaces of the young or old generations") \ 2098 \ 2099 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2100 "Policy for changeing generation size for throughput goals") \ 2101 \ 2102 product(uintx, AdaptiveSizePausePolicy, 0, \ 2103 "Policy for changing generation size for pause goals") \ 2104 \ 2105 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2106 "Adjust tenured generation to achive a minor pause goal") \ 2107 \ 2108 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2109 "Adjust young generation to achive a major pause goal") \ 2110 \ 2111 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2112 "Number of steps where heuristics is used before data is used") \ 2113 \ 2114 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2115 "Number of collections before the adaptive sizing is started") \ 2116 \ 2117 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2118 "Collecton interval for printing information; zero => never") \ 2119 \ 2120 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2121 "Use adaptive minimum footprint as a goal") \ 2122 \ 2123 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2124 "Weight given to exponential resizing, between 0 and 100") \ 2125 \ 2126 product(uintx, AdaptiveTimeWeight, 25, \ 2127 "Weight given to time in adaptive policy, between 0 and 100") \ 2128 \ 2129 product(uintx, PausePadding, 1, \ 2130 "How much buffer to keep for pause time") \ 2131 \ 2132 product(uintx, PromotedPadding, 3, \ 2133 "How much buffer to keep for promotion failure") \ 2134 \ 2135 product(uintx, SurvivorPadding, 3, \ 2136 "How much buffer to keep for survivor overflow") \ 2137 \ 2138 product(uintx, AdaptivePermSizeWeight, 20, \ 2139 "Weight for perm gen exponential resizing, between 0 and 100") \ 2140 \ 2141 product(uintx, PermGenPadding, 3, \ 2142 "How much buffer to keep for perm gen sizing") \ 2143 \ 2144 product(uintx, ThresholdTolerance, 10, \ 2145 "Allowed collection cost difference between generations") \ 2146 \ 2147 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2148 "If collection costs are within margin, reduce both by full " \ 2149 "delta") \ 2150 \ 2151 product(uintx, YoungGenerationSizeIncrement, 20, \ 2152 "Adaptive size percentage change in young generation") \ 2153 \ 2154 product(uintx, YoungGenerationSizeSupplement, 80, \ 2155 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2156 \ 2157 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2158 "Decay factor to YoungedGenerationSizeSupplement") \ 2159 \ 2160 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2161 "Adaptive size percentage change in tenured generation") \ 2162 \ 2163 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2164 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2165 \ 2166 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2167 "Decay factor to TenuredGenerationSizeIncrement") \ 2168 \ 2169 product(uintx, MaxGCPauseMillis, max_uintx, \ 2170 "Adaptive size policy maximum GC pause time goal in msec, " \ 2171 "or (G1 Only) the max. GC time per MMU time slice") \ 2172 \ 2173 product(uintx, GCPauseIntervalMillis, 0, \ 2174 "Time slice for MMU specification") \ 2175 \ 2176 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2177 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2178 \ 2179 product(uintx, GCTimeRatio, 99, \ 2180 "Adaptive size policy application time to GC time ratio") \ 2181 \ 2182 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2183 "Adaptive size scale down factor for shrinking") \ 2184 \ 2185 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2186 "Adaptive size decays the major cost for long major intervals") \ 2187 \ 2188 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2189 "Time scale over which major costs decay") \ 2190 \ 2191 product(uintx, MinSurvivorRatio, 3, \ 2192 "Minimum ratio of young generation/survivor space size") \ 2193 \ 2194 product(uintx, InitialSurvivorRatio, 8, \ 2195 "Initial ratio of eden/survivor space size") \ 2196 \ 2197 product(uintx, BaseFootPrintEstimate, 256*M, \ 2198 "Estimate of footprint other than Java Heap") \ 2199 \ 2200 product(bool, UseGCOverheadLimit, true, \ 2201 "Use policy to limit of proportion of time spent in GC " \ 2202 "before an OutOfMemory error is thrown") \ 2203 \ 2204 product(uintx, GCTimeLimit, 98, \ 2205 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2206 "error is thrown (used with GCHeapFreeLimit)") \ 2207 \ 2208 product(uintx, GCHeapFreeLimit, 2, \ 2209 "Minimum percentage of free space after a full GC before an " \ 2210 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2211 \ 2212 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2213 "Number of consecutive collections before gc time limit fires") \ 2214 \ 2215 product(bool, PrintAdaptiveSizePolicy, false, \ 2216 "Print information about AdaptiveSizePolicy") \ 2217 \ 2218 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2219 "How far ahead to prefetch destination area (<= 0 means off)") \ 2220 \ 2221 product(intx, PrefetchScanIntervalInBytes, -1, \ 2222 "How far ahead to prefetch scan area (<= 0 means off)") \ 2223 \ 2224 product(intx, PrefetchFieldsAhead, -1, \ 2225 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2226 \ 2227 develop(bool, UsePrefetchQueue, true, \ 2228 "Use the prefetch queue during PS promotion") \ 2229 \ 2230 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2231 "Verify system before exiting") \ 2232 \ 2233 diagnostic(bool, VerifyBeforeGC, false, \ 2234 "Verify memory system before GC") \ 2235 \ 2236 diagnostic(bool, VerifyAfterGC, false, \ 2237 "Verify memory system after GC") \ 2238 \ 2239 diagnostic(bool, VerifyDuringGC, false, \ 2240 "Verify memory system during GC (between phases)") \ 2241 \ 2242 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2243 "Enable parallel memory system verification") \ 2244 \ 2245 diagnostic(bool, DeferInitialCardMark, false, \ 2246 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2247 "may arise from new_pre_store_barrier") \ 2248 \ 2249 diagnostic(bool, VerifyRememberedSets, false, \ 2250 "Verify GC remembered sets") \ 2251 \ 2252 diagnostic(bool, VerifyObjectStartArray, true, \ 2253 "Verify GC object start array if verify before/after") \ 2254 \ 2255 product(bool, DisableExplicitGC, false, \ 2256 "Tells whether calling System.gc() does a full GC") \ 2257 \ 2258 notproduct(bool, CheckMemoryInitialization, false, \ 2259 "Checks memory initialization") \ 2260 \ 2261 product(bool, CollectGen0First, false, \ 2262 "Collect youngest generation before each full GC") \ 2263 \ 2264 diagnostic(bool, BindCMSThreadToCPU, false, \ 2265 "Bind CMS Thread to CPU if possible") \ 2266 \ 2267 diagnostic(uintx, CPUForCMSThread, 0, \ 2268 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2269 \ 2270 product(bool, BindGCTaskThreadsToCPUs, false, \ 2271 "Bind GCTaskThreads to CPUs if possible") \ 2272 \ 2273 product(bool, UseGCTaskAffinity, false, \ 2274 "Use worker affinity when asking for GCTasks") \ 2275 \ 2276 product(uintx, ProcessDistributionStride, 4, \ 2277 "Stride through processors when distributing processes") \ 2278 \ 2279 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2280 "number of times the coordinator GC thread will sleep while " \ 2281 "yielding before giving up and resuming GC") \ 2282 \ 2283 product(uintx, CMSYieldSleepCount, 0, \ 2284 "number of times a GC thread (minus the coordinator) " \ 2285 "will sleep while yielding before giving up and resuming GC") \ 2286 \ 2287 /* gc tracing */ \ 2288 manageable(bool, PrintGC, false, \ 2289 "Print message at garbage collect") \ 2290 \ 2291 manageable(bool, PrintGCDetails, false, \ 2292 "Print more details at garbage collect") \ 2293 \ 2294 manageable(bool, PrintGCDateStamps, false, \ 2295 "Print date stamps at garbage collect") \ 2296 \ 2297 manageable(bool, PrintGCTimeStamps, false, \ 2298 "Print timestamps at garbage collect") \ 2299 \ 2300 product(bool, PrintGCTaskTimeStamps, false, \ 2301 "Print timestamps for individual gc worker thread tasks") \ 2302 \ 2303 develop(intx, ConcGCYieldTimeout, 0, \ 2304 "If non-zero, assert that GC threads yield within this # of ms.") \ 2305 \ 2306 notproduct(bool, TraceMarkSweep, false, \ 2307 "Trace mark sweep") \ 2308 \ 2309 product(bool, PrintReferenceGC, false, \ 2310 "Print times spent handling reference objects during GC " \ 2311 " (enabled only when PrintGCDetails)") \ 2312 \ 2313 develop(bool, TraceReferenceGC, false, \ 2314 "Trace handling of soft/weak/final/phantom references") \ 2315 \ 2316 develop(bool, TraceFinalizerRegistration, false, \ 2317 "Trace registration of final references") \ 2318 \ 2319 notproduct(bool, TraceScavenge, false, \ 2320 "Trace scavenge") \ 2321 \ 2322 product_rw(bool, TraceClassLoading, false, \ 2323 "Trace all classes loaded") \ 2324 \ 2325 product(bool, TraceClassLoadingPreorder, false, \ 2326 "Trace all classes loaded in order referenced (not loaded)") \ 2327 \ 2328 product_rw(bool, TraceClassUnloading, false, \ 2329 "Trace unloading of classes") \ 2330 \ 2331 product_rw(bool, TraceLoaderConstraints, false, \ 2332 "Trace loader constraints") \ 2333 \ 2334 product(bool, TraceGen0Time, false, \ 2335 "Trace accumulated time for Gen 0 collection") \ 2336 \ 2337 product(bool, TraceGen1Time, false, \ 2338 "Trace accumulated time for Gen 1 collection") \ 2339 \ 2340 product(bool, PrintTenuringDistribution, false, \ 2341 "Print tenuring age information") \ 2342 \ 2343 product_rw(bool, PrintHeapAtGC, false, \ 2344 "Print heap layout before and after each GC") \ 2345 \ 2346 product_rw(bool, PrintHeapAtGCExtended, false, \ 2347 "Prints extended information about the layout of the heap " \ 2348 "when -XX:+PrintHeapAtGC is set") \ 2349 \ 2350 product(bool, PrintHeapAtSIGBREAK, true, \ 2351 "Print heap layout in response to SIGBREAK") \ 2352 \ 2353 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2354 "Print a class histogram before any major stop-world GC") \ 2355 \ 2356 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2357 "Print a class histogram after any major stop-world GC") \ 2358 \ 2359 manageable(bool, PrintClassHistogram, false, \ 2360 "Print a histogram of class instances") \ 2361 \ 2362 develop(bool, TraceWorkGang, false, \ 2363 "Trace activities of work gangs") \ 2364 \ 2365 product(bool, TraceParallelOldGCTasks, false, \ 2366 "Trace multithreaded GC activity") \ 2367 \ 2368 develop(bool, TraceBlockOffsetTable, false, \ 2369 "Print BlockOffsetTable maps") \ 2370 \ 2371 develop(bool, TraceCardTableModRefBS, false, \ 2372 "Print CardTableModRefBS maps") \ 2373 \ 2374 develop(bool, TraceGCTaskManager, false, \ 2375 "Trace actions of the GC task manager") \ 2376 \ 2377 develop(bool, TraceGCTaskQueue, false, \ 2378 "Trace actions of the GC task queues") \ 2379 \ 2380 diagnostic(bool, TraceGCTaskThread, false, \ 2381 "Trace actions of the GC task threads") \ 2382 \ 2383 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2384 "Print the time taken by each parallel old gc phase." \ 2385 "PrintGCDetails must also be enabled.") \ 2386 \ 2387 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2388 "Trace parallel old gc marking phase") \ 2389 \ 2390 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2391 "Trace parallel old gc summary phase") \ 2392 \ 2393 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2394 "Trace parallel old gc compaction phase") \ 2395 \ 2396 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2397 "Trace parallel old gc dense prefix computation") \ 2398 \ 2399 develop(bool, IgnoreLibthreadGPFault, false, \ 2400 "Suppress workaround for libthread GP fault") \ 2401 \ 2402 product(bool, PrintJNIGCStalls, false, \ 2403 "Print diagnostic message when GC is stalled" \ 2404 "by JNI critical section") \ 2405 \ 2406 /* GC log rotation setting */ \ 2407 \ 2408 product(bool, UseGCLogFileRotation, false, \ 2409 "Prevent large gclog file for long running app. " \ 2410 "Requires -Xloggc:<filename>") \ 2411 \ 2412 product(uintx, NumberOfGCLogFiles, 0, \ 2413 "Number of gclog files in rotation, " \ 2414 "Default: 0, no rotation") \ 2415 \ 2416 product(uintx, GCLogFileSize, 0, \ 2417 "GC log file size, Default: 0 bytes, no rotation " \ 2418 "Only valid with UseGCLogFileRotation") \ 2419 \ 2420 /* JVMTI heap profiling */ \ 2421 \ 2422 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2423 "Trace JVMTI object tagging calls") \ 2424 \ 2425 diagnostic(bool, VerifyBeforeIteration, false, \ 2426 "Verify memory system before JVMTI iteration") \ 2427 \ 2428 /* compiler interface */ \ 2429 \ 2430 develop(bool, CIPrintCompilerName, false, \ 2431 "when CIPrint is active, print the name of the active compiler") \ 2432 \ 2433 develop(bool, CIPrintCompileQueue, false, \ 2434 "display the contents of the compile queue whenever a " \ 2435 "compilation is enqueued") \ 2436 \ 2437 develop(bool, CIPrintRequests, false, \ 2438 "display every request for compilation") \ 2439 \ 2440 product(bool, CITime, false, \ 2441 "collect timing information for compilation") \ 2442 \ 2443 develop(bool, CITimeEach, false, \ 2444 "display timing information after each successful compilation") \ 2445 \ 2446 develop(bool, CICountOSR, true, \ 2447 "use a separate counter when assigning ids to osr compilations") \ 2448 \ 2449 develop(bool, CICompileNatives, true, \ 2450 "compile native methods if supported by the compiler") \ 2451 \ 2452 develop_pd(bool, CICompileOSR, \ 2453 "compile on stack replacement methods if supported by the " \ 2454 "compiler") \ 2455 \ 2456 develop(bool, CIPrintMethodCodes, false, \ 2457 "print method bytecodes of the compiled code") \ 2458 \ 2459 develop(bool, CIPrintTypeFlow, false, \ 2460 "print the results of ciTypeFlow analysis") \ 2461 \ 2462 develop(bool, CITraceTypeFlow, false, \ 2463 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2464 \ 2465 develop(intx, CICloneLoopTestLimit, 100, \ 2466 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2467 \ 2468 develop(intx, OSROnlyBCI, -1, \ 2469 "OSR only at this bci. Negative values mean exclude that bci") \ 2470 \ 2471 /* temp diagnostics */ \ 2472 \ 2473 diagnostic(bool, TraceRedundantCompiles, false, \ 2474 "Have compile broker print when a request already in the queue is"\ 2475 " requested again") \ 2476 \ 2477 diagnostic(bool, InitialCompileFast, false, \ 2478 "Initial compile at CompLevel_fast_compile") \ 2479 \ 2480 diagnostic(bool, InitialCompileReallyFast, false, \ 2481 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2482 \ 2483 diagnostic(bool, FullProfileOnReInterpret, true, \ 2484 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2485 \ 2486 /* compiler */ \ 2487 \ 2488 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2489 "Number of compiler threads to run") \ 2490 \ 2491 product(intx, CompilationPolicyChoice, 0, \ 2492 "which compilation policy (0/1)") \ 2493 \ 2494 develop(bool, UseStackBanging, true, \ 2495 "use stack banging for stack overflow checks (required for " \ 2496 "proper StackOverflow handling; disable only to measure cost " \ 2497 "of stackbanging)") \ 2498 \ 2499 develop(bool, Use24BitFPMode, true, \ 2500 "Set 24-bit FPU mode on a per-compile basis ") \ 2501 \ 2502 develop(bool, Use24BitFP, true, \ 2503 "use FP instructions that produce 24-bit precise results") \ 2504 \ 2505 develop(bool, UseStrictFP, true, \ 2506 "use strict fp if modifier strictfp is set") \ 2507 \ 2508 develop(bool, GenerateSynchronizationCode, true, \ 2509 "generate locking/unlocking code for synchronized methods and " \ 2510 "monitors") \ 2511 \ 2512 develop(bool, GenerateCompilerNullChecks, true, \ 2513 "Generate explicit null checks for loads/stores/calls") \ 2514 \ 2515 develop(bool, GenerateRangeChecks, true, \ 2516 "Generate range checks for array accesses") \ 2517 \ 2518 develop_pd(bool, ImplicitNullChecks, \ 2519 "generate code for implicit null checks") \ 2520 \ 2521 product(bool, PrintSafepointStatistics, false, \ 2522 "print statistics about safepoint synchronization") \ 2523 \ 2524 product(intx, PrintSafepointStatisticsCount, 300, \ 2525 "total number of safepoint statistics collected " \ 2526 "before printing them out") \ 2527 \ 2528 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2529 "print safepoint statistics only when safepoint takes" \ 2530 " more than PrintSafepointSatisticsTimeout in millis") \ 2531 \ 2532 product(bool, TraceSafepointCleanupTime, false, \ 2533 "print the break down of clean up tasks performed during" \ 2534 " safepoint") \ 2535 \ 2536 develop(bool, InlineAccessors, true, \ 2537 "inline accessor methods (get/set)") \ 2538 \ 2539 product(bool, Inline, true, \ 2540 "enable inlining") \ 2541 \ 2542 product(bool, ClipInlining, true, \ 2543 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2544 \ 2545 develop(bool, UseCHA, true, \ 2546 "enable CHA") \ 2547 \ 2548 product(bool, UseTypeProfile, true, \ 2549 "Check interpreter profile for historically monomorphic calls") \ 2550 \ 2551 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2552 "% of major receiver type to all profiled receivers") \ 2553 \ 2554 notproduct(bool, TimeCompiler, false, \ 2555 "time the compiler") \ 2556 \ 2557 notproduct(bool, TimeCompiler2, false, \ 2558 "detailed time the compiler (requires +TimeCompiler)") \ 2559 \ 2560 diagnostic(bool, PrintInlining, false, \ 2561 "prints inlining optimizations") \ 2562 \ 2563 diagnostic(bool, PrintIntrinsics, false, \ 2564 "prints attempted and successful inlining of intrinsics") \ 2565 \ 2566 product(bool, UseCountLeadingZerosInstruction, false, \ 2567 "Use count leading zeros instruction") \ 2568 \ 2569 product(bool, UsePopCountInstruction, false, \ 2570 "Use population count instruction") \ 2571 \ 2572 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2573 "do not expand intrinsics whose (internal) names appear here") \ 2574 \ 2575 develop(bool, StressReflectiveCode, false, \ 2576 "Use inexact types at allocations, etc., to test reflection") \ 2577 \ 2578 develop(bool, EagerInitialization, false, \ 2579 "Eagerly initialize classes if possible") \ 2580 \ 2581 develop(bool, TraceMethodReplacement, false, \ 2582 "Print when methods are replaced do to recompilation") \ 2583 \ 2584 develop(bool, PrintMethodFlushing, false, \ 2585 "print the nmethods being flushed") \ 2586 \ 2587 notproduct(bool, LogMultipleMutexLocking, false, \ 2588 "log locking and unlocking of mutexes (only if multiple locks " \ 2589 "are held)") \ 2590 \ 2591 develop(bool, UseRelocIndex, false, \ 2592 "use an index to speed random access to relocations") \ 2593 \ 2594 develop(bool, StressCodeBuffers, false, \ 2595 "Exercise code buffer expansion and other rare state changes") \ 2596 \ 2597 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2598 "Generate extra debugging info for non-safepoints in nmethods") \ 2599 \ 2600 diagnostic(bool, DebugInlinedCalls, true, \ 2601 "If false, restricts profiled locations to the root method only") \ 2602 \ 2603 product(bool, PrintVMOptions, false, \ 2604 "Print flags that appeared on the command line") \ 2605 \ 2606 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2607 "Ignore unrecognized VM options") \ 2608 \ 2609 product(bool, PrintCommandLineFlags, false, \ 2610 "Print flags specified on command line or set by ergonomics") \ 2611 \ 2612 product(bool, PrintFlagsInitial, false, \ 2613 "Print all VM flags before argument processing and exit VM") \ 2614 \ 2615 product(bool, PrintFlagsFinal, false, \ 2616 "Print all VM flags after argument and ergonomic processing") \ 2617 \ 2618 notproduct(bool, PrintFlagsWithComments, false, \ 2619 "Print all VM flags with default values and descriptions and exit")\ 2620 \ 2621 diagnostic(bool, SerializeVMOutput, true, \ 2622 "Use a mutex to serialize output to tty and hotspot.log") \ 2623 \ 2624 diagnostic(bool, DisplayVMOutput, true, \ 2625 "Display all VM output on the tty, independently of LogVMOutput") \ 2626 \ 2627 diagnostic(bool, LogVMOutput, trueInDebug, \ 2628 "Save VM output to hotspot.log, or to LogFile") \ 2629 \ 2630 diagnostic(ccstr, LogFile, NULL, \ 2631 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2632 \ 2633 product(ccstr, ErrorFile, NULL, \ 2634 "If an error occurs, save the error data to this file " \ 2635 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2636 \ 2637 product(bool, DisplayVMOutputToStderr, false, \ 2638 "If DisplayVMOutput is true, display all VM output to stderr") \ 2639 \ 2640 product(bool, DisplayVMOutputToStdout, false, \ 2641 "If DisplayVMOutput is true, display all VM output to stdout") \ 2642 \ 2643 product(bool, UseHeavyMonitors, false, \ 2644 "use heavyweight instead of lightweight Java monitors") \ 2645 \ 2646 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2647 "print histogram of the symbol table") \ 2648 \ 2649 notproduct(bool, ExitVMOnVerifyError, false, \ 2650 "standard exit from VM if bytecode verify error " \ 2651 "(only in debug mode)") \ 2652 \ 2653 notproduct(ccstr, AbortVMOnException, NULL, \ 2654 "Call fatal if this exception is thrown. Example: " \ 2655 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2656 \ 2657 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2658 "Call fatal if the exception pointed by AbortVMOnException " \ 2659 "has this message.") \ 2660 \ 2661 develop(bool, DebugVtables, false, \ 2662 "add debugging code to vtable dispatch") \ 2663 \ 2664 develop(bool, PrintVtables, false, \ 2665 "print vtables when printing klass") \ 2666 \ 2667 notproduct(bool, PrintVtableStats, false, \ 2668 "print vtables stats at end of run") \ 2669 \ 2670 develop(bool, TraceCreateZombies, false, \ 2671 "trace creation of zombie nmethods") \ 2672 \ 2673 notproduct(bool, IgnoreLockingAssertions, false, \ 2674 "disable locking assertions (for speed)") \ 2675 \ 2676 notproduct(bool, VerifyLoopOptimizations, false, \ 2677 "verify major loop optimizations") \ 2678 \ 2679 product(bool, RangeCheckElimination, true, \ 2680 "Split loop iterations to eliminate range checks") \ 2681 \ 2682 develop_pd(bool, UncommonNullCast, \ 2683 "track occurrences of null in casts; adjust compiler tactics") \ 2684 \ 2685 develop(bool, TypeProfileCasts, true, \ 2686 "treat casts like calls for purposes of type profiling") \ 2687 \ 2688 develop(bool, MonomorphicArrayCheck, true, \ 2689 "Uncommon-trap array store checks that require full type check") \ 2690 \ 2691 diagnostic(bool, ProfileDynamicTypes, true, \ 2692 "do extra type profiling and use it more aggressively") \ 2693 \ 2694 develop(bool, DelayCompilationDuringStartup, true, \ 2695 "Delay invoking the compiler until main application class is " \ 2696 "loaded") \ 2697 \ 2698 develop(bool, CompileTheWorld, false, \ 2699 "Compile all methods in all classes in bootstrap class path " \ 2700 "(stress test)") \ 2701 \ 2702 develop(bool, CompileTheWorldPreloadClasses, true, \ 2703 "Preload all classes used by a class before start loading") \ 2704 \ 2705 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2706 "Force a safepoint every n compiles so sweeper can keep up") \ 2707 \ 2708 develop(bool, TraceIterativeGVN, false, \ 2709 "Print progress during Iterative Global Value Numbering") \ 2710 \ 2711 develop(bool, FillDelaySlots, true, \ 2712 "Fill delay slots (on SPARC only)") \ 2713 \ 2714 develop(bool, VerifyIterativeGVN, false, \ 2715 "Verify Def-Use modifications during sparse Iterative Global " \ 2716 "Value Numbering") \ 2717 \ 2718 notproduct(bool, TracePhaseCCP, false, \ 2719 "Print progress during Conditional Constant Propagation") \ 2720 \ 2721 develop(bool, TimeLivenessAnalysis, false, \ 2722 "Time computation of bytecode liveness analysis") \ 2723 \ 2724 develop(bool, TraceLivenessGen, false, \ 2725 "Trace the generation of liveness analysis information") \ 2726 \ 2727 notproduct(bool, TraceLivenessQuery, false, \ 2728 "Trace queries of liveness analysis information") \ 2729 \ 2730 notproduct(bool, CollectIndexSetStatistics, false, \ 2731 "Collect information about IndexSets") \ 2732 \ 2733 develop(bool, PrintDominators, false, \ 2734 "Print out dominator trees for GVN") \ 2735 \ 2736 develop(bool, UseLoopSafepoints, true, \ 2737 "Generate Safepoint nodes in every loop") \ 2738 \ 2739 notproduct(bool, TraceCISCSpill, false, \ 2740 "Trace allocators use of cisc spillable instructions") \ 2741 \ 2742 notproduct(bool, TraceSpilling, false, \ 2743 "Trace spilling") \ 2744 \ 2745 product(bool, SplitIfBlocks, true, \ 2746 "Clone compares and control flow through merge points to fold " \ 2747 "some branches") \ 2748 \ 2749 develop(intx, FastAllocateSizeLimit, 128*K, \ 2750 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2751 "Inline allocations larger than this in doublewords must go slow")\ 2752 \ 2753 product(bool, AggressiveOpts, false, \ 2754 "Enable aggressive optimizations - see arguments.cpp") \ 2755 \ 2756 product(bool, UseStringCache, false, \ 2757 "Enable String cache capabilities on String.java") \ 2758 \ 2759 /* statistics */ \ 2760 develop(bool, CountCompiledCalls, false, \ 2761 "counts method invocations") \ 2762 \ 2763 notproduct(bool, CountRuntimeCalls, false, \ 2764 "counts VM runtime calls") \ 2765 \ 2766 develop(bool, CountJNICalls, false, \ 2767 "counts jni method invocations") \ 2768 \ 2769 notproduct(bool, CountJVMCalls, false, \ 2770 "counts jvm method invocations") \ 2771 \ 2772 notproduct(bool, CountRemovableExceptions, false, \ 2773 "count exceptions that could be replaced by branches due to " \ 2774 "inlining") \ 2775 \ 2776 notproduct(bool, ICMissHistogram, false, \ 2777 "produce histogram of IC misses") \ 2778 \ 2779 notproduct(bool, PrintClassStatistics, false, \ 2780 "prints class statistics at end of run") \ 2781 \ 2782 notproduct(bool, PrintMethodStatistics, false, \ 2783 "prints method statistics at end of run") \ 2784 \ 2785 /* interpreter */ \ 2786 develop(bool, ClearInterpreterLocals, false, \ 2787 "Always clear local variables of interpreter activations upon " \ 2788 "entry") \ 2789 \ 2790 product_pd(bool, RewriteBytecodes, \ 2791 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2792 \ 2793 product_pd(bool, RewriteFrequentPairs, \ 2794 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2795 \ 2796 diagnostic(bool, PrintInterpreter, false, \ 2797 "Prints the generated interpreter code") \ 2798 \ 2799 product(bool, UseInterpreter, true, \ 2800 "Use interpreter for non-compiled methods") \ 2801 \ 2802 develop(bool, UseFastSignatureHandlers, true, \ 2803 "Use fast signature handlers for native calls") \ 2804 \ 2805 develop(bool, UseV8InstrsOnly, false, \ 2806 "Use SPARC-V8 Compliant instruction subset") \ 2807 \ 2808 product(bool, UseNiagaraInstrs, false, \ 2809 "Use Niagara-efficient instruction subset") \ 2810 \ 2811 develop(bool, UseCASForSwap, false, \ 2812 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2813 \ 2814 product(bool, UseLoopCounter, true, \ 2815 "Increment invocation counter on backward branch") \ 2816 \ 2817 product(bool, UseFastEmptyMethods, true, \ 2818 "Use fast method entry code for empty methods") \ 2819 \ 2820 product(bool, UseFastAccessorMethods, true, \ 2821 "Use fast method entry code for accessor methods") \ 2822 \ 2823 product_pd(bool, UseOnStackReplacement, \ 2824 "Use on stack replacement, calls runtime if invoc. counter " \ 2825 "overflows in loop") \ 2826 \ 2827 notproduct(bool, TraceOnStackReplacement, false, \ 2828 "Trace on stack replacement") \ 2829 \ 2830 develop(bool, PoisonOSREntry, true, \ 2831 "Detect abnormal calls to OSR code") \ 2832 \ 2833 product_pd(bool, PreferInterpreterNativeStubs, \ 2834 "Use always interpreter stubs for native methods invoked via " \ 2835 "interpreter") \ 2836 \ 2837 develop(bool, CountBytecodes, false, \ 2838 "Count number of bytecodes executed") \ 2839 \ 2840 develop(bool, PrintBytecodeHistogram, false, \ 2841 "Print histogram of the executed bytecodes") \ 2842 \ 2843 develop(bool, PrintBytecodePairHistogram, false, \ 2844 "Print histogram of the executed bytecode pairs") \ 2845 \ 2846 diagnostic(bool, PrintSignatureHandlers, false, \ 2847 "Print code generated for native method signature handlers") \ 2848 \ 2849 develop(bool, VerifyOops, false, \ 2850 "Do plausibility checks for oops") \ 2851 \ 2852 develop(bool, CheckUnhandledOops, false, \ 2853 "Check for unhandled oops in VM code") \ 2854 \ 2855 develop(bool, VerifyJNIFields, trueInDebug, \ 2856 "Verify jfieldIDs for instance fields") \ 2857 \ 2858 notproduct(bool, VerifyJNIEnvThread, false, \ 2859 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2860 "from JNI") \ 2861 \ 2862 develop(bool, VerifyFPU, false, \ 2863 "Verify FPU state (check for NaN's, etc.)") \ 2864 \ 2865 develop(bool, VerifyThread, false, \ 2866 "Watch the thread register for corruption (SPARC only)") \ 2867 \ 2868 develop(bool, VerifyActivationFrameSize, false, \ 2869 "Verify that activation frame didn't become smaller than its " \ 2870 "minimal size") \ 2871 \ 2872 develop(bool, TraceFrequencyInlining, false, \ 2873 "Trace frequency based inlining") \ 2874 \ 2875 notproduct(bool, TraceTypeProfile, false, \ 2876 "Trace type profile") \ 2877 \ 2878 develop_pd(bool, InlineIntrinsics, \ 2879 "Inline intrinsics that can be statically resolved") \ 2880 \ 2881 product_pd(bool, ProfileInterpreter, \ 2882 "Profile at the bytecode level during interpretation") \ 2883 \ 2884 develop_pd(bool, ProfileTraps, \ 2885 "Profile deoptimization traps at the bytecode level") \ 2886 \ 2887 product(intx, ProfileMaturityPercentage, 20, \ 2888 "number of method invocations/branches (expressed as % of " \ 2889 "CompileThreshold) before using the method's profile") \ 2890 \ 2891 develop(bool, PrintMethodData, false, \ 2892 "Print the results of +ProfileInterpreter at end of run") \ 2893 \ 2894 develop(bool, VerifyDataPointer, trueInDebug, \ 2895 "Verify the method data pointer during interpreter profiling") \ 2896 \ 2897 develop(bool, VerifyCompiledCode, false, \ 2898 "Include miscellaneous runtime verifications in nmethod code; " \ 2899 "default off because it disturbs nmethod size heuristics") \ 2900 \ 2901 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2902 "Manually make GC thread crash then dump java stack trace; " \ 2903 "Test only") \ 2904 \ 2905 /* compilation */ \ 2906 product(bool, UseCompiler, true, \ 2907 "use compilation") \ 2908 \ 2909 develop(bool, TraceCompilationPolicy, false, \ 2910 "Trace compilation policy") \ 2911 \ 2912 develop(bool, TimeCompilationPolicy, false, \ 2913 "Time the compilation policy") \ 2914 \ 2915 product(bool, UseCounterDecay, true, \ 2916 "adjust recompilation counters") \ 2917 \ 2918 develop(intx, CounterHalfLifeTime, 30, \ 2919 "half-life time of invocation counters (in secs)") \ 2920 \ 2921 develop(intx, CounterDecayMinIntervalLength, 500, \ 2922 "Min. ms. between invocation of CounterDecay") \ 2923 \ 2924 product(bool, AlwaysCompileLoopMethods, false, \ 2925 "when using recompilation, never interpret methods " \ 2926 "containing loops") \ 2927 \ 2928 product(bool, DontCompileHugeMethods, true, \ 2929 "don't compile methods > HugeMethodLimit") \ 2930 \ 2931 /* Bytecode escape analysis estimation. */ \ 2932 product(bool, EstimateArgEscape, true, \ 2933 "Analyze bytecodes to estimate escape state of arguments") \ 2934 \ 2935 product(intx, BCEATraceLevel, 0, \ 2936 "How much tracing to do of bytecode escape analysis estimates") \ 2937 \ 2938 product(intx, MaxBCEAEstimateLevel, 5, \ 2939 "Maximum number of nested calls that are analyzed by BC EA.") \ 2940 \ 2941 product(intx, MaxBCEAEstimateSize, 150, \ 2942 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2943 \ 2944 product(intx, AllocatePrefetchStyle, 1, \ 2945 "0 = no prefetch, " \ 2946 "1 = prefetch instructions for each allocation, " \ 2947 "2 = use TLAB watermark to gate allocation prefetch, " \ 2948 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2949 \ 2950 product(intx, AllocatePrefetchDistance, -1, \ 2951 "Distance to prefetch ahead of allocation pointer") \ 2952 \ 2953 product(intx, AllocatePrefetchLines, 3, \ 2954 "Number of lines to prefetch ahead of array allocation pointer") \ 2955 \ 2956 product(intx, AllocateInstancePrefetchLines, 1, \ 2957 "Number of lines to prefetch ahead of instance allocation pointer") \ 2958 \ 2959 product(intx, AllocatePrefetchStepSize, 16, \ 2960 "Step size in bytes of sequential prefetch instructions") \ 2961 \ 2962 product(intx, AllocatePrefetchInstr, 0, \ 2963 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2964 \ 2965 product(intx, ReadPrefetchInstr, 0, \ 2966 "Prefetch instruction to prefetch ahead") \ 2967 \ 2968 product(uintx, ArraycopySrcPrefetchDistance, 0, \ 2969 "Distance to prefetch source array in arracopy") \ 2970 \ 2971 product(uintx, ArraycopyDstPrefetchDistance, 0, \ 2972 "Distance to prefetch destination array in arracopy") \ 2973 \ 2974 /* deoptimization */ \ 2975 develop(bool, TraceDeoptimization, false, \ 2976 "Trace deoptimization") \ 2977 \ 2978 develop(bool, DebugDeoptimization, false, \ 2979 "Tracing various information while debugging deoptimization") \ 2980 \ 2981 product(intx, SelfDestructTimer, 0, \ 2982 "Will cause VM to terminate after a given time (in minutes) " \ 2983 "(0 means off)") \ 2984 \ 2985 product(intx, MaxJavaStackTraceDepth, 1024, \ 2986 "Max. no. of lines in the stack trace for Java exceptions " \ 2987 "(0 means all)") \ 2988 \ 2989 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2990 "Guarantee a safepoint (at least) every so many milliseconds " \ 2991 "(0 means none)")) \ 2992 \ 2993 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2994 "Guarantee a safepoint (at least) every so many milliseconds " \ 2995 "(0 means none)")) \ 2996 \ 2997 product(intx, SafepointTimeoutDelay, 10000, \ 2998 "Delay in milliseconds for option SafepointTimeout") \ 2999 \ 3000 product(intx, NmethodSweepFraction, 4, \ 3001 "Number of invocations of sweeper to cover all nmethods") \ 3002 \ 3003 product(intx, NmethodSweepCheckInterval, 5, \ 3004 "Compilers wake up every n seconds to possibly sweep nmethods") \ 3005 \ 3006 notproduct(bool, LogSweeper, false, \ 3007 "Keep a ring buffer of sweeper activity") \ 3008 \ 3009 notproduct(intx, SweeperLogEntries, 1024, \ 3010 "Number of records in the ring buffer of sweeper activity") \ 3011 \ 3012 notproduct(intx, MemProfilingInterval, 500, \ 3013 "Time between each invocation of the MemProfiler") \ 3014 \ 3015 develop(intx, MallocCatchPtr, -1, \ 3016 "Hit breakpoint when mallocing/freeing this pointer") \ 3017 \ 3018 notproduct(intx, AssertRepeat, 1, \ 3019 "number of times to evaluate expression in assert " \ 3020 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3021 \ 3022 notproduct(ccstrlist, SuppressErrorAt, "", \ 3023 "List of assertions (file:line) to muzzle") \ 3024 \ 3025 notproduct(uintx, HandleAllocationLimit, 1024, \ 3026 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3027 "is used") \ 3028 \ 3029 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3030 "Threshold for total handle allocation when " \ 3031 "+TraceHandleAllocation is used") \ 3032 \ 3033 develop(intx, StackPrintLimit, 100, \ 3034 "number of stack frames to print in VM-level stack dump") \ 3035 \ 3036 notproduct(intx, MaxElementPrintSize, 256, \ 3037 "maximum number of elements to print") \ 3038 \ 3039 notproduct(intx, MaxSubklassPrintSize, 4, \ 3040 "maximum number of subklasses to print when printing klass") \ 3041 \ 3042 product(intx, MaxInlineLevel, 9, \ 3043 "maximum number of nested calls that are inlined") \ 3044 \ 3045 product(intx, MaxRecursiveInlineLevel, 1, \ 3046 "maximum number of nested recursive calls that are inlined") \ 3047 \ 3048 product_pd(intx, InlineSmallCode, \ 3049 "Only inline already compiled methods if their code size is " \ 3050 "less than this") \ 3051 \ 3052 product(intx, MaxInlineSize, 35, \ 3053 "maximum bytecode size of a method to be inlined") \ 3054 \ 3055 product_pd(intx, FreqInlineSize, \ 3056 "maximum bytecode size of a frequent method to be inlined") \ 3057 \ 3058 product(intx, MaxTrivialSize, 6, \ 3059 "maximum bytecode size of a trivial method to be inlined") \ 3060 \ 3061 product(intx, MinInliningThreshold, 250, \ 3062 "min. invocation count a method needs to have to be inlined") \ 3063 \ 3064 develop(intx, AlignEntryCode, 4, \ 3065 "aligns entry code to specified value (in bytes)") \ 3066 \ 3067 develop(intx, MethodHistogramCutoff, 100, \ 3068 "cutoff value for method invoc. histogram (+CountCalls)") \ 3069 \ 3070 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3071 "# of interpreted methods to show in profile") \ 3072 \ 3073 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3074 "# of compiled methods to show in profile") \ 3075 \ 3076 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3077 "# of stub methods to show in profile") \ 3078 \ 3079 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3080 "# of runtime stub nodes to show in profile") \ 3081 \ 3082 product(intx, ProfileIntervalsTicks, 100, \ 3083 "# of ticks between printing of interval profile " \ 3084 "(+ProfileIntervals)") \ 3085 \ 3086 notproduct(intx, ScavengeALotInterval, 1, \ 3087 "Interval between which scavenge will occur with +ScavengeALot") \ 3088 \ 3089 notproduct(intx, FullGCALotInterval, 1, \ 3090 "Interval between which full gc will occur with +FullGCALot") \ 3091 \ 3092 notproduct(intx, FullGCALotStart, 0, \ 3093 "For which invocation to start FullGCAlot") \ 3094 \ 3095 notproduct(intx, FullGCALotDummies, 32*K, \ 3096 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3097 "to move") \ 3098 \ 3099 develop(intx, DontYieldALotInterval, 10, \ 3100 "Interval between which yields will be dropped (milliseconds)") \ 3101 \ 3102 develop(intx, MinSleepInterval, 1, \ 3103 "Minimum sleep() interval (milliseconds) when " \ 3104 "ConvertSleepToYield is off (used for SOLARIS)") \ 3105 \ 3106 product(intx, EventLogLength, 2000, \ 3107 "maximum nof events in event log") \ 3108 \ 3109 develop(intx, ProfilerPCTickThreshold, 15, \ 3110 "Number of ticks in a PC buckets to be a hotspot") \ 3111 \ 3112 notproduct(intx, DeoptimizeALotInterval, 5, \ 3113 "Number of exits until DeoptimizeALot kicks in") \ 3114 \ 3115 notproduct(intx, ZombieALotInterval, 5, \ 3116 "Number of exits until ZombieALot kicks in") \ 3117 \ 3118 develop(bool, StressNonEntrant, false, \ 3119 "Mark nmethods non-entrant at registration") \ 3120 \ 3121 diagnostic(intx, MallocVerifyInterval, 0, \ 3122 "if non-zero, verify C heap after every N calls to " \ 3123 "malloc/realloc/free") \ 3124 \ 3125 diagnostic(intx, MallocVerifyStart, 0, \ 3126 "if non-zero, start verifying C heap after Nth call to " \ 3127 "malloc/realloc/free") \ 3128 \ 3129 product(intx, TypeProfileWidth, 2, \ 3130 "number of receiver types to record in call/cast profile") \ 3131 \ 3132 develop(intx, BciProfileWidth, 2, \ 3133 "number of return bci's to record in ret profile") \ 3134 \ 3135 product(intx, PerMethodRecompilationCutoff, 400, \ 3136 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3137 \ 3138 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3139 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3140 \ 3141 product(intx, PerMethodTrapLimit, 100, \ 3142 "Limit on traps (of one kind) in a method (includes inlines)") \ 3143 \ 3144 product(intx, PerBytecodeTrapLimit, 4, \ 3145 "Limit on traps (of one kind) at a particular BCI") \ 3146 \ 3147 develop(intx, FreqCountInvocations, 1, \ 3148 "Scaling factor for branch frequencies (deprecated)") \ 3149 \ 3150 develop(intx, InlineFrequencyRatio, 20, \ 3151 "Ratio of call site execution to caller method invocation") \ 3152 \ 3153 develop_pd(intx, InlineFrequencyCount, \ 3154 "Count of call site execution necessary to trigger frequent " \ 3155 "inlining") \ 3156 \ 3157 develop(intx, InlineThrowCount, 50, \ 3158 "Force inlining of interpreted methods that throw this often") \ 3159 \ 3160 develop(intx, InlineThrowMaxSize, 200, \ 3161 "Force inlining of throwing methods smaller than this") \ 3162 \ 3163 product(intx, AliasLevel, 3, \ 3164 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3165 "2 for class split, 3 for unique instances") \ 3166 \ 3167 develop(bool, VerifyAliases, false, \ 3168 "perform extra checks on the results of alias analysis") \ 3169 \ 3170 develop(intx, ProfilerNodeSize, 1024, \ 3171 "Size in K to allocate for the Profile Nodes of each thread") \ 3172 \ 3173 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3174 "Number of times to spin wait on a v8 atomic operation lock") \ 3175 \ 3176 product(intx, ReadSpinIterations, 100, \ 3177 "Number of read attempts before a yield (spin inner loop)") \ 3178 \ 3179 product_pd(intx, PreInflateSpin, \ 3180 "Number of times to spin wait before inflation") \ 3181 \ 3182 product(intx, PreBlockSpin, 10, \ 3183 "Number of times to spin in an inflated lock before going to " \ 3184 "an OS lock") \ 3185 \ 3186 /* gc parameters */ \ 3187 product(uintx, InitialHeapSize, 0, \ 3188 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3189 \ 3190 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3191 "Maximum heap size (in bytes)") \ 3192 \ 3193 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3194 "Initial tenured generation size (in bytes)") \ 3195 \ 3196 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3197 "Initial new generation size (in bytes)") \ 3198 \ 3199 product(uintx, MaxNewSize, max_uintx, \ 3200 "Maximum new generation size (in bytes), max_uintx means set " \ 3201 "ergonomically") \ 3202 \ 3203 product(uintx, PretenureSizeThreshold, 0, \ 3204 "Maximum size in bytes of objects allocated in DefNew " \ 3205 "generation; zero means no maximum") \ 3206 \ 3207 product(uintx, TLABSize, 0, \ 3208 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3209 \ 3210 product(uintx, MinTLABSize, 2*K, \ 3211 "Minimum allowed TLAB size (in bytes)") \ 3212 \ 3213 product(uintx, TLABAllocationWeight, 35, \ 3214 "Allocation averaging weight") \ 3215 \ 3216 product(uintx, TLABWasteTargetPercent, 1, \ 3217 "Percentage of Eden that can be wasted") \ 3218 \ 3219 product(uintx, TLABRefillWasteFraction, 64, \ 3220 "Max TLAB waste at a refill (internal fragmentation)") \ 3221 \ 3222 product(uintx, TLABWasteIncrement, 4, \ 3223 "Increment allowed waste at slow allocation") \ 3224 \ 3225 product(intx, SurvivorRatio, 8, \ 3226 "Ratio of eden/survivor space size") \ 3227 \ 3228 product(intx, NewRatio, 2, \ 3229 "Ratio of new/old generation sizes") \ 3230 \ 3231 product_pd(uintx, NewSizeThreadIncrease, \ 3232 "Additional size added to desired new generation size per " \ 3233 "non-daemon thread (in bytes)") \ 3234 \ 3235 product_pd(uintx, PermSize, \ 3236 "Initial size of permanent generation (in bytes)") \ 3237 \ 3238 product_pd(uintx, MaxPermSize, \ 3239 "Maximum size of permanent generation (in bytes)") \ 3240 \ 3241 product(uintx, MinHeapFreeRatio, 40, \ 3242 "Min percentage of heap free after GC to avoid expansion") \ 3243 \ 3244 product(uintx, MaxHeapFreeRatio, 70, \ 3245 "Max percentage of heap free after GC to avoid shrinking") \ 3246 \ 3247 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3248 "Number of milliseconds per MB of free space in the heap") \ 3249 \ 3250 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3251 "Min change in heap space due to GC (in bytes)") \ 3252 \ 3253 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3254 "Min expansion of permanent heap (in bytes)") \ 3255 \ 3256 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3257 "Max expansion of permanent heap without full GC (in bytes)") \ 3258 \ 3259 product(intx, QueuedAllocationWarningCount, 0, \ 3260 "Number of times an allocation that queues behind a GC " \ 3261 "will retry before printing a warning") \ 3262 \ 3263 diagnostic(uintx, VerifyGCStartAt, 0, \ 3264 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3265 \ 3266 diagnostic(intx, VerifyGCLevel, 0, \ 3267 "Generation level at which to start +VerifyBefore/AfterGC") \ 3268 \ 3269 develop(uintx, ExitAfterGCNum, 0, \ 3270 "If non-zero, exit after this GC.") \ 3271 \ 3272 product(intx, MaxTenuringThreshold, 15, \ 3273 "Maximum value for tenuring threshold") \ 3274 \ 3275 product(intx, InitialTenuringThreshold, 7, \ 3276 "Initial value for tenuring threshold") \ 3277 \ 3278 product(intx, TargetSurvivorRatio, 50, \ 3279 "Desired percentage of survivor space used after scavenge") \ 3280 \ 3281 product(uintx, MarkSweepDeadRatio, 5, \ 3282 "Percentage (0-100) of the old gen allowed as dead wood." \ 3283 "Serial mark sweep treats this as both the min and max value." \ 3284 "CMS uses this value only if it falls back to mark sweep." \ 3285 "Par compact uses a variable scale based on the density of the" \ 3286 "generation and treats this as the max value when the heap is" \ 3287 "either completely full or completely empty. Par compact also" \ 3288 "has a smaller default value; see arguments.cpp.") \ 3289 \ 3290 product(uintx, PermMarkSweepDeadRatio, 20, \ 3291 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3292 "See MarkSweepDeadRatio for collector-specific comments.") \ 3293 \ 3294 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3295 "How often should we fully compact the heap (ignoring the dead " \ 3296 "space parameters)") \ 3297 \ 3298 product(intx, PrintCMSStatistics, 0, \ 3299 "Statistics for CMS") \ 3300 \ 3301 product(bool, PrintCMSInitiationStatistics, false, \ 3302 "Statistics for initiating a CMS collection") \ 3303 \ 3304 product(intx, PrintFLSStatistics, 0, \ 3305 "Statistics for CMS' FreeListSpace") \ 3306 \ 3307 product(intx, PrintFLSCensus, 0, \ 3308 "Census for CMS' FreeListSpace") \ 3309 \ 3310 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3311 "Delay in ms between expansion and allocation") \ 3312 \ 3313 product(intx, DeferThrSuspendLoopCount, 4000, \ 3314 "(Unstable) Number of times to iterate in safepoint loop " \ 3315 " before blocking VM threads ") \ 3316 \ 3317 product(intx, DeferPollingPageLoopCount, -1, \ 3318 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3319 "before changing safepoint polling page to RO ") \ 3320 \ 3321 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3322 \ 3323 product(bool, PSChunkLargeArrays, true, \ 3324 "true: process large arrays in chunks") \ 3325 \ 3326 product(uintx, GCDrainStackTargetSize, 64, \ 3327 "how many entries we'll try to leave on the stack during " \ 3328 "parallel GC") \ 3329 \ 3330 /* stack parameters */ \ 3331 product_pd(intx, StackYellowPages, \ 3332 "Number of yellow zone (recoverable overflows) pages") \ 3333 \ 3334 product_pd(intx, StackRedPages, \ 3335 "Number of red zone (unrecoverable overflows) pages") \ 3336 \ 3337 product_pd(intx, StackShadowPages, \ 3338 "Number of shadow zone (for overflow checking) pages" \ 3339 " this should exceed the depth of the VM and native call stack") \ 3340 \ 3341 product_pd(intx, ThreadStackSize, \ 3342 "Thread Stack Size (in Kbytes)") \ 3343 \ 3344 product_pd(intx, VMThreadStackSize, \ 3345 "Non-Java Thread Stack Size (in Kbytes)") \ 3346 \ 3347 product_pd(intx, CompilerThreadStackSize, \ 3348 "Compiler Thread Stack Size (in Kbytes)") \ 3349 \ 3350 develop_pd(uintx, JVMInvokeMethodSlack, \ 3351 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3352 \ 3353 product(uintx, ThreadSafetyMargin, 50*M, \ 3354 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3355 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3356 "disable this feature") \ 3357 \ 3358 /* code cache parameters */ \ 3359 develop(uintx, CodeCacheSegmentSize, 64, \ 3360 "Code cache segment size (in bytes) - smallest unit of " \ 3361 "allocation") \ 3362 \ 3363 develop_pd(intx, CodeEntryAlignment, \ 3364 "Code entry alignment for generated code (in bytes)") \ 3365 \ 3366 product_pd(intx, OptoLoopAlignment, \ 3367 "Align inner loops to zero relative to this modulus") \ 3368 \ 3369 product_pd(uintx, InitialCodeCacheSize, \ 3370 "Initial code cache size (in bytes)") \ 3371 \ 3372 product_pd(uintx, ReservedCodeCacheSize, \ 3373 "Reserved code cache size (in bytes) - maximum code cache size") \ 3374 \ 3375 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3376 "When less than X space left, we stop compiling.") \ 3377 \ 3378 product_pd(uintx, CodeCacheExpansionSize, \ 3379 "Code cache expansion size (in bytes)") \ 3380 \ 3381 develop_pd(uintx, CodeCacheMinBlockLength, \ 3382 "Minimum number of segments in a code cache block.") \ 3383 \ 3384 notproduct(bool, ExitOnFullCodeCache, false, \ 3385 "Exit the VM if we fill the code cache.") \ 3386 \ 3387 product(bool, UseCodeCacheFlushing, true, \ 3388 "Attempt to clean the code cache before shutting off compiler") \ 3389 \ 3390 product(intx, MinCodeCacheFlushingInterval, 30, \ 3391 "Min number of seconds between code cache cleaning sessions") \ 3392 \ 3393 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3394 "When less than X space left, start code cache cleaning") \ 3395 \ 3396 /* interpreter debugging */ \ 3397 develop(intx, BinarySwitchThreshold, 5, \ 3398 "Minimal number of lookupswitch entries for rewriting to binary " \ 3399 "switch") \ 3400 \ 3401 develop(intx, StopInterpreterAt, 0, \ 3402 "Stops interpreter execution at specified bytecode number") \ 3403 \ 3404 develop(intx, TraceBytecodesAt, 0, \ 3405 "Traces bytecodes starting with specified bytecode number") \ 3406 \ 3407 /* compiler interface */ \ 3408 develop(intx, CIStart, 0, \ 3409 "the id of the first compilation to permit") \ 3410 \ 3411 develop(intx, CIStop, -1, \ 3412 "the id of the last compilation to permit") \ 3413 \ 3414 develop(intx, CIStartOSR, 0, \ 3415 "the id of the first osr compilation to permit " \ 3416 "(CICountOSR must be on)") \ 3417 \ 3418 develop(intx, CIStopOSR, -1, \ 3419 "the id of the last osr compilation to permit " \ 3420 "(CICountOSR must be on)") \ 3421 \ 3422 develop(intx, CIBreakAtOSR, -1, \ 3423 "id of osr compilation to break at") \ 3424 \ 3425 develop(intx, CIBreakAt, -1, \ 3426 "id of compilation to break at") \ 3427 \ 3428 product(ccstrlist, CompileOnly, "", \ 3429 "List of methods (pkg/class.name) to restrict compilation to") \ 3430 \ 3431 product(ccstr, CompileCommandFile, NULL, \ 3432 "Read compiler commands from this file [.hotspot_compiler]") \ 3433 \ 3434 product(ccstrlist, CompileCommand, "", \ 3435 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3436 \ 3437 product(bool, CICompilerCountPerCPU, false, \ 3438 "1 compiler thread for log(N CPUs)") \ 3439 \ 3440 develop(intx, CIFireOOMAt, -1, \ 3441 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3442 "(non-negative value throws OOM after this many CI accesses " \ 3443 "in each compile)") \ 3444 \ 3445 develop(intx, CIFireOOMAtDelay, -1, \ 3446 "Wait for this many CI accesses to occur in all compiles before " \ 3447 "beginning to throw OutOfMemoryErrors in each compile") \ 3448 \ 3449 notproduct(bool, CIObjectFactoryVerify, false, \ 3450 "enable potentially expensive verification in ciObjectFactory") \ 3451 \ 3452 /* Priorities */ \ 3453 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3454 \ 3455 product(intx, ThreadPriorityPolicy, 0, \ 3456 "0 : Normal. "\ 3457 " VM chooses priorities that are appropriate for normal "\ 3458 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3459 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3460 " map to lower native priority values. On Windows applications"\ 3461 " are allowed to use higher native priorities. However, with "\ 3462 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3463 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3464 " interfere with system threads. On Linux thread priorities "\ 3465 " are ignored because the OS does not support static priority "\ 3466 " in SCHED_OTHER scheduling class which is the only choice for"\ 3467 " non-root, non-realtime applications. "\ 3468 "1 : Aggressive. "\ 3469 " Java thread priorities map over to the entire range of "\ 3470 " native thread priorities. Higher Java thread priorities map "\ 3471 " to higher native thread priorities. This policy should be "\ 3472 " used with care, as sometimes it can cause performance "\ 3473 " degradation in the application and/or the entire system. On "\ 3474 " Linux this policy requires root privilege.") \ 3475 \ 3476 product(bool, ThreadPriorityVerbose, false, \ 3477 "print priority changes") \ 3478 \ 3479 product(intx, DefaultThreadPriority, -1, \ 3480 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3481 \ 3482 product(intx, CompilerThreadPriority, -1, \ 3483 "what priority should compiler threads run at (-1 means no change)") \ 3484 \ 3485 product(intx, VMThreadPriority, -1, \ 3486 "what priority should VM threads run at (-1 means no change)") \ 3487 \ 3488 product(bool, CompilerThreadHintNoPreempt, true, \ 3489 "(Solaris only) Give compiler threads an extra quanta") \ 3490 \ 3491 product(bool, VMThreadHintNoPreempt, false, \ 3492 "(Solaris only) Give VM thread an extra quanta") \ 3493 \ 3494 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3495 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3496 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3497 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3498 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3499 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3500 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3501 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3502 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3503 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3504 \ 3505 /* compiler debugging */ \ 3506 notproduct(intx, CompileTheWorldStartAt, 1, \ 3507 "First class to consider when using +CompileTheWorld") \ 3508 \ 3509 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3510 "Last class to consider when using +CompileTheWorld") \ 3511 \ 3512 develop(intx, NewCodeParameter, 0, \ 3513 "Testing Only: Create a dedicated integer parameter before " \ 3514 "putback") \ 3515 \ 3516 /* new oopmap storage allocation */ \ 3517 develop(intx, MinOopMapAllocation, 8, \ 3518 "Minimum number of OopMap entries in an OopMapSet") \ 3519 \ 3520 /* Background Compilation */ \ 3521 develop(intx, LongCompileThreshold, 50, \ 3522 "Used with +TraceLongCompiles") \ 3523 \ 3524 product(intx, StarvationMonitorInterval, 200, \ 3525 "Pause between each check in ms") \ 3526 \ 3527 /* recompilation */ \ 3528 product_pd(intx, CompileThreshold, \ 3529 "number of interpreted method invocations before (re-)compiling") \ 3530 \ 3531 product_pd(intx, BackEdgeThreshold, \ 3532 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3533 \ 3534 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3535 "Interpreter (tier 0) invocation notification frequency.") \ 3536 \ 3537 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3538 "C1 without MDO (tier 2) invocation notification frequency.") \ 3539 \ 3540 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3541 "C1 with MDO profiling (tier 3) invocation notification " \ 3542 "frequency.") \ 3543 \ 3544 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3545 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3546 \ 3547 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3548 "Interpreter (tier 0) invocation notification frequency.") \ 3549 \ 3550 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3551 "C1 without MDO (tier 2) invocation notification frequency.") \ 3552 \ 3553 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3554 "C1 with MDO profiling (tier 3) invocation notification " \ 3555 "frequency.") \ 3556 \ 3557 product(intx, Tier2CompileThreshold, 0, \ 3558 "threshold at which tier 2 compilation is invoked") \ 3559 \ 3560 product(intx, Tier2BackEdgeThreshold, 0, \ 3561 "Back edge threshold at which tier 2 compilation is invoked") \ 3562 \ 3563 product(intx, Tier3InvocationThreshold, 200, \ 3564 "Compile if number of method invocations crosses this " \ 3565 "threshold") \ 3566 \ 3567 product(intx, Tier3MinInvocationThreshold, 100, \ 3568 "Minimum invocation to compile at tier 3") \ 3569 \ 3570 product(intx, Tier3CompileThreshold, 2000, \ 3571 "Threshold at which tier 3 compilation is invoked (invocation " \ 3572 "minimum must be satisfied.") \ 3573 \ 3574 product(intx, Tier3BackEdgeThreshold, 7000, \ 3575 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3576 \ 3577 product(intx, Tier4InvocationThreshold, 5000, \ 3578 "Compile if number of method invocations crosses this " \ 3579 "threshold") \ 3580 \ 3581 product(intx, Tier4MinInvocationThreshold, 600, \ 3582 "Minimum invocation to compile at tier 4") \ 3583 \ 3584 product(intx, Tier4CompileThreshold, 15000, \ 3585 "Threshold at which tier 4 compilation is invoked (invocation " \ 3586 "minimum must be satisfied.") \ 3587 \ 3588 product(intx, Tier4BackEdgeThreshold, 40000, \ 3589 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3590 \ 3591 product(intx, Tier3DelayOn, 5, \ 3592 "If C2 queue size grows over this amount per compiler thread " \ 3593 "stop compiling at tier 3 and start compiling at tier 2") \ 3594 \ 3595 product(intx, Tier3DelayOff, 2, \ 3596 "If C2 queue size is less than this amount per compiler thread " \ 3597 "allow methods compiled at tier 2 transition to tier 3") \ 3598 \ 3599 product(intx, Tier3LoadFeedback, 5, \ 3600 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3601 "reaches this amount per compiler thread") \ 3602 \ 3603 product(intx, Tier4LoadFeedback, 3, \ 3604 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3605 "reaches this amount per compiler thread") \ 3606 \ 3607 product(intx, TieredCompileTaskTimeout, 50, \ 3608 "Kill compile task if method was not used within " \ 3609 "given timeout in milliseconds") \ 3610 \ 3611 product(intx, TieredStopAtLevel, 4, \ 3612 "Stop at given compilation level") \ 3613 \ 3614 product(intx, Tier0ProfilingStartPercentage, 200, \ 3615 "Start profiling in interpreter if the counters exceed tier 3" \ 3616 "thresholds by the specified percentage") \ 3617 \ 3618 product(intx, TieredRateUpdateMinTime, 1, \ 3619 "Minimum rate sampling interval (in milliseconds)") \ 3620 \ 3621 product(intx, TieredRateUpdateMaxTime, 25, \ 3622 "Maximum rate sampling interval (in milliseconds)") \ 3623 \ 3624 product_pd(bool, TieredCompilation, \ 3625 "Enable tiered compilation") \ 3626 \ 3627 product(bool, PrintTieredEvents, false, \ 3628 "Print tiered events notifications") \ 3629 \ 3630 product(bool, StressTieredRuntime, false, \ 3631 "Alternate client and server compiler on compile requests") \ 3632 \ 3633 product_pd(intx, OnStackReplacePercentage, \ 3634 "NON_TIERED number of method invocations/branches (expressed as %"\ 3635 "of CompileThreshold) before (re-)compiling OSR code") \ 3636 \ 3637 product(intx, InterpreterProfilePercentage, 33, \ 3638 "NON_TIERED number of method invocations/branches (expressed as %"\ 3639 "of CompileThreshold) before profiling in the interpreter") \ 3640 \ 3641 develop(intx, MaxRecompilationSearchLength, 10, \ 3642 "max. # frames to inspect searching for recompilee") \ 3643 \ 3644 develop(intx, MaxInterpretedSearchLength, 3, \ 3645 "max. # interp. frames to skip when searching for recompilee") \ 3646 \ 3647 develop(intx, DesiredMethodLimit, 8000, \ 3648 "desired max. method size (in bytecodes) after inlining") \ 3649 \ 3650 develop(intx, HugeMethodLimit, 8000, \ 3651 "don't compile methods larger than this if " \ 3652 "+DontCompileHugeMethods") \ 3653 \ 3654 /* New JDK 1.4 reflection implementation */ \ 3655 \ 3656 develop(bool, UseNewReflection, true, \ 3657 "Temporary flag for transition to reflection based on dynamic " \ 3658 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3659 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3660 "changes were needed") \ 3661 \ 3662 develop(bool, VerifyReflectionBytecodes, false, \ 3663 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3664 "in situations like that described in 4486457 or for " \ 3665 "constructors generated for serialization, so can not be enabled "\ 3666 "in product.") \ 3667 \ 3668 product(bool, ReflectionWrapResolutionErrors, true, \ 3669 "Temporary flag for transition to AbstractMethodError wrapped " \ 3670 "in InvocationTargetException. See 6531596") \ 3671 \ 3672 \ 3673 develop(intx, FastSuperclassLimit, 8, \ 3674 "Depth of hardwired instanceof accelerator array") \ 3675 \ 3676 /* Properties for Java libraries */ \ 3677 \ 3678 product(intx, MaxDirectMemorySize, -1, \ 3679 "Maximum total size of NIO direct-buffer allocations") \ 3680 \ 3681 /* temporary developer defined flags */ \ 3682 \ 3683 diagnostic(bool, UseNewCode, false, \ 3684 "Testing Only: Use the new version while testing") \ 3685 \ 3686 diagnostic(bool, UseNewCode2, false, \ 3687 "Testing Only: Use the new version while testing") \ 3688 \ 3689 diagnostic(bool, UseNewCode3, false, \ 3690 "Testing Only: Use the new version while testing") \ 3691 \ 3692 /* flags for performance data collection */ \ 3693 \ 3694 product(bool, UsePerfData, falseInEmbedded, \ 3695 "Flag to disable jvmstat instrumentation for performance testing" \ 3696 "and problem isolation purposes.") \ 3697 \ 3698 product(bool, PerfDataSaveToFile, false, \ 3699 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3700 \ 3701 product(ccstr, PerfDataSaveFile, NULL, \ 3702 "Save PerfData memory to the specified absolute pathname," \ 3703 "%p in the file name if present will be replaced by pid") \ 3704 \ 3705 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3706 "Data sampling interval in milliseconds") \ 3707 \ 3708 develop(bool, PerfTraceDataCreation, false, \ 3709 "Trace creation of Performance Data Entries") \ 3710 \ 3711 develop(bool, PerfTraceMemOps, false, \ 3712 "Trace PerfMemory create/attach/detach calls") \ 3713 \ 3714 product(bool, PerfDisableSharedMem, false, \ 3715 "Store performance data in standard memory") \ 3716 \ 3717 product(intx, PerfDataMemorySize, 32*K, \ 3718 "Size of performance data memory region. Will be rounded " \ 3719 "up to a multiple of the native os page size.") \ 3720 \ 3721 product(intx, PerfMaxStringConstLength, 1024, \ 3722 "Maximum PerfStringConstant string length before truncation") \ 3723 \ 3724 product(bool, PerfAllowAtExitRegistration, false, \ 3725 "Allow registration of atexit() methods") \ 3726 \ 3727 product(bool, PerfBypassFileSystemCheck, false, \ 3728 "Bypass Win32 file system criteria checks (Windows Only)") \ 3729 \ 3730 product(intx, UnguardOnExecutionViolation, 0, \ 3731 "Unguard page and retry on no-execute fault (Win32 only)" \ 3732 "0=off, 1=conservative, 2=aggressive") \ 3733 \ 3734 /* Serviceability Support */ \ 3735 \ 3736 product(bool, ManagementServer, false, \ 3737 "Create JMX Management Server") \ 3738 \ 3739 product(bool, DisableAttachMechanism, false, \ 3740 "Disable mechanism that allows tools to attach to this VM") \ 3741 \ 3742 product(bool, StartAttachListener, false, \ 3743 "Always start Attach Listener at VM startup") \ 3744 \ 3745 manageable(bool, PrintConcurrentLocks, false, \ 3746 "Print java.util.concurrent locks in thread dump") \ 3747 \ 3748 product(bool, TransmitErrorReport, false, \ 3749 "Enable error report transmission on erroneous termination") \ 3750 \ 3751 product(ccstr, ErrorReportServer, NULL, \ 3752 "Override built-in error report server address") \ 3753 \ 3754 /* Shared spaces */ \ 3755 \ 3756 product(bool, UseSharedSpaces, true, \ 3757 "Use shared spaces in the permanent generation") \ 3758 \ 3759 product(bool, RequireSharedSpaces, false, \ 3760 "Require shared spaces in the permanent generation") \ 3761 \ 3762 product(bool, DumpSharedSpaces, false, \ 3763 "Special mode: JVM reads a class list, loads classes, builds " \ 3764 "shared spaces, and dumps the shared spaces to a file to be " \ 3765 "used in future JVM runs.") \ 3766 \ 3767 product(bool, PrintSharedSpaces, false, \ 3768 "Print usage of shared spaces") \ 3769 \ 3770 product(uintx, SharedDummyBlockSize, 512*M, \ 3771 "Size of dummy block used to shift heap addresses (in bytes)") \ 3772 \ 3773 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3774 "Size of read-write space in permanent generation (in bytes)") \ 3775 \ 3776 product(uintx, SharedReadOnlySize, 10*M, \ 3777 "Size of read-only space in permanent generation (in bytes)") \ 3778 \ 3779 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3780 "Size of the shared data area adjacent to the heap (in bytes)") \ 3781 \ 3782 product(uintx, SharedMiscCodeSize, 4*M, \ 3783 "Size of the shared code area adjacent to the heap (in bytes)") \ 3784 \ 3785 diagnostic(bool, SharedOptimizeColdStart, true, \ 3786 "At dump time, order shared objects to achieve better " \ 3787 "cold startup time.") \ 3788 \ 3789 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3790 "Reordering policy for SharedOptimizeColdStart " \ 3791 "0=favor classload-time locality, 1=balanced, " \ 3792 "2=favor runtime locality") \ 3793 \ 3794 diagnostic(bool, SharedSkipVerify, false, \ 3795 "Skip assert() and verify() which page-in unwanted shared " \ 3796 "objects. ") \ 3797 \ 3798 diagnostic(bool, EnableInvokeDynamic, true, \ 3799 "support JSR 292 (method handles, invokedynamic, " \ 3800 "anonymous classes") \ 3801 \ 3802 product(bool, AnonymousClasses, false, \ 3803 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3804 \ 3805 experimental(bool, EnableMethodHandles, false, \ 3806 "support method handles (deprecated)") \ 3807 \ 3808 diagnostic(intx, MethodHandlePushLimit, 3, \ 3809 "number of additional stack slots a method handle may push") \ 3810 \ 3811 diagnostic(bool, PrintMethodHandleStubs, false, \ 3812 "Print generated stub code for method handles") \ 3813 \ 3814 develop(bool, TraceMethodHandles, false, \ 3815 "trace internal method handle operations") \ 3816 \ 3817 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3818 "perform extra checks when constructing method handles") \ 3819 \ 3820 diagnostic(bool, OptimizeMethodHandles, true, \ 3821 "when constructing method handles, try to improve them") \ 3822 \ 3823 develop(bool, StressMethodHandleWalk, false, \ 3824 "Process all method handles with MethodHandleWalk") \ 3825 \ 3826 diagnostic(bool, UseRicochetFrames, true, \ 3827 "use ricochet stack frames for method handle combination, " \ 3828 "if the platform supports them") \ 3829 \ 3830 experimental(bool, TrustFinalNonStaticFields, false, \ 3831 "trust final non-static declarations for constant folding") \ 3832 \ 3833 experimental(bool, AllowInvokeGeneric, false, \ 3834 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3835 "as equivalent methods") \ 3836 \ 3837 develop(bool, TraceInvokeDynamic, false, \ 3838 "trace internal invoke dynamic operations") \ 3839 \ 3840 diagnostic(bool, PauseAtStartup, false, \ 3841 "Causes the VM to pause at startup time and wait for the pause " \ 3842 "file to be removed (default: ./vm.paused.<pid>)") \ 3843 \ 3844 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3845 "The file to create and for whose removal to await when pausing " \ 3846 "at startup. (default: ./vm.paused.<pid>)") \ 3847 \ 3848 diagnostic(bool, PauseAtExit, false, \ 3849 "Pause and wait for keypress on exit if a debugger is attached") \ 3850 \ 3851 product(bool, ExtendedDTraceProbes, false, \ 3852 "Enable performance-impacting dtrace probes") \ 3853 \ 3854 product(bool, DTraceMethodProbes, false, \ 3855 "Enable dtrace probes for method-entry and method-exit") \ 3856 \ 3857 product(bool, DTraceAllocProbes, false, \ 3858 "Enable dtrace probes for object allocation") \ 3859 \ 3860 product(bool, DTraceMonitorProbes, false, \ 3861 "Enable dtrace probes for monitor events") \ 3862 \ 3863 product(bool, RelaxAccessControlCheck, false, \ 3864 "Relax the access control checks in the verifier") \ 3865 \ 3866 diagnostic(bool, PrintDTraceDOF, false, \ 3867 "Print the DTrace DOF passed to the system for JSDT probes") \ 3868 \ 3869 product(uintx, StringTableSize, 1009, \ 3870 "Number of buckets in the interned String table") \ 3871 \ 3872 product(bool, UseVMInterruptibleIO, false, \ 3873 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3874 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3875 " of this flag is true for JDK 6 and earliers") 3876 3877/* 3878 * Macros for factoring of globals 3879 */ 3880 3881// Interface macros 3882#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3883#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3884#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3885#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3886#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3887#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3888#ifdef PRODUCT 3889#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3890#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3891#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3892#else 3893#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3894#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3895#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3896#endif 3897// Special LP64 flags, product only needed for now. 3898#ifdef _LP64 3899#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3900#else 3901#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3902#endif // _LP64 3903 3904// Implementation macros 3905#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3906#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3907#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3908#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3909#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3910#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3911#ifdef PRODUCT 3912#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3913#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3914#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3915#else 3916#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3917#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3918#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3919#endif 3920#ifdef _LP64 3921#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3922#else 3923#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3924#endif // _LP64 3925 3926RUNTIME_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) 3927 3928RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3929 3930// Extensions 3931 3932#include "runtime/globals_ext.hpp" 3933 3934#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3935