globals.hpp revision 8610:da05ab7fde79
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29 30// use this for flags that are true per default in the tiered build 31// but false in non-tiered builds, and vice versa 32#ifdef TIERED 33#define trueInTiered true 34#define falseInTiered false 35#else 36#define trueInTiered false 37#define falseInTiered true 38#endif 39 40#ifdef TARGET_ARCH_x86 41# include "globals_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "globals_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "globals_zero.hpp" 48#endif 49#ifdef TARGET_ARCH_arm 50# include "globals_arm.hpp" 51#endif 52#ifdef TARGET_ARCH_ppc 53# include "globals_ppc.hpp" 54#endif 55#ifdef TARGET_ARCH_aarch64 56# include "globals_aarch64.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_linux 59# include "globals_linux.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_solaris 62# include "globals_solaris.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_windows 65# include "globals_windows.hpp" 66#endif 67#ifdef TARGET_OS_FAMILY_aix 68# include "globals_aix.hpp" 69#endif 70#ifdef TARGET_OS_FAMILY_bsd 71# include "globals_bsd.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_x86 74# include "globals_linux_x86.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_linux_sparc 77# include "globals_linux_sparc.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_linux_zero 80# include "globals_linux_zero.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_solaris_x86 83# include "globals_solaris_x86.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_solaris_sparc 86# include "globals_solaris_sparc.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_windows_x86 89# include "globals_windows_x86.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_linux_arm 92# include "globals_linux_arm.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_linux_ppc 95# include "globals_linux_ppc.hpp" 96#endif 97#ifdef TARGET_OS_ARCH_linux_aarch64 98# include "globals_linux_aarch64.hpp" 99#endif 100#ifdef TARGET_OS_ARCH_aix_ppc 101# include "globals_aix_ppc.hpp" 102#endif 103#ifdef TARGET_OS_ARCH_bsd_x86 104# include "globals_bsd_x86.hpp" 105#endif 106#ifdef TARGET_OS_ARCH_bsd_zero 107# include "globals_bsd_zero.hpp" 108#endif 109#ifdef COMPILER1 110#ifdef TARGET_ARCH_x86 111# include "c1_globals_x86.hpp" 112#endif 113#ifdef TARGET_ARCH_sparc 114# include "c1_globals_sparc.hpp" 115#endif 116#ifdef TARGET_ARCH_arm 117# include "c1_globals_arm.hpp" 118#endif 119#ifdef TARGET_ARCH_aarch64 120# include "c1_globals_aarch64.hpp" 121#endif 122#ifdef TARGET_OS_FAMILY_linux 123# include "c1_globals_linux.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_solaris 126# include "c1_globals_solaris.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_windows 129# include "c1_globals_windows.hpp" 130#endif 131#ifdef TARGET_OS_FAMILY_aix 132# include "c1_globals_aix.hpp" 133#endif 134#ifdef TARGET_OS_FAMILY_bsd 135# include "c1_globals_bsd.hpp" 136#endif 137#ifdef TARGET_ARCH_ppc 138# include "c1_globals_ppc.hpp" 139#endif 140#endif 141#ifdef COMPILER2 142#ifdef TARGET_ARCH_x86 143# include "c2_globals_x86.hpp" 144#endif 145#ifdef TARGET_ARCH_sparc 146# include "c2_globals_sparc.hpp" 147#endif 148#ifdef TARGET_ARCH_arm 149# include "c2_globals_arm.hpp" 150#endif 151#ifdef TARGET_ARCH_ppc 152# include "c2_globals_ppc.hpp" 153#endif 154#ifdef TARGET_ARCH_aarch64 155# include "c2_globals_aarch64.hpp" 156#endif 157#ifdef TARGET_OS_FAMILY_linux 158# include "c2_globals_linux.hpp" 159#endif 160#ifdef TARGET_OS_FAMILY_solaris 161# include "c2_globals_solaris.hpp" 162#endif 163#ifdef TARGET_OS_FAMILY_windows 164# include "c2_globals_windows.hpp" 165#endif 166#ifdef TARGET_OS_FAMILY_aix 167# include "c2_globals_aix.hpp" 168#endif 169#ifdef TARGET_OS_FAMILY_bsd 170# include "c2_globals_bsd.hpp" 171#endif 172#endif 173#ifdef SHARK 174#ifdef TARGET_ARCH_zero 175# include "shark_globals_zero.hpp" 176#endif 177#endif 178 179#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 180define_pd_global(bool, BackgroundCompilation, false); 181define_pd_global(bool, UseTLAB, false); 182define_pd_global(bool, CICompileOSR, false); 183define_pd_global(bool, UseTypeProfile, false); 184define_pd_global(bool, UseOnStackReplacement, false); 185define_pd_global(bool, InlineIntrinsics, false); 186define_pd_global(bool, PreferInterpreterNativeStubs, true); 187define_pd_global(bool, ProfileInterpreter, false); 188define_pd_global(bool, ProfileTraps, false); 189define_pd_global(bool, TieredCompilation, false); 190 191define_pd_global(intx, CompileThreshold, 0); 192 193define_pd_global(intx, OnStackReplacePercentage, 0); 194define_pd_global(bool, ResizeTLAB, false); 195define_pd_global(intx, FreqInlineSize, 0); 196define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 197define_pd_global(intx, InlineClassNatives, true); 198define_pd_global(intx, InlineUnsafeOps, true); 199define_pd_global(intx, InitialCodeCacheSize, 160*K); 200define_pd_global(intx, ReservedCodeCacheSize, 32*M); 201define_pd_global(intx, NonProfiledCodeHeapSize, 0); 202define_pd_global(intx, ProfiledCodeHeapSize, 0); 203define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 204 205define_pd_global(intx, CodeCacheExpansionSize, 32*K); 206define_pd_global(intx, CodeCacheMinBlockLength, 1); 207define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 208define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 209define_pd_global(bool, NeverActAsServerClassMachine, true); 210define_pd_global(uint64_t,MaxRAM, 1ULL*G); 211#define CI_COMPILER_COUNT 0 212#else 213 214#ifdef COMPILER2 215#define CI_COMPILER_COUNT 2 216#else 217#define CI_COMPILER_COUNT 1 218#endif // COMPILER2 219 220#endif // no compilers 221 222// string type aliases used only in this file 223typedef const char* ccstr; 224typedef const char* ccstrlist; // represents string arguments which accumulate 225 226struct Flag { 227 enum Flags { 228 // value origin 229 DEFAULT = 0, 230 COMMAND_LINE = 1, 231 ENVIRON_VAR = 2, 232 CONFIG_FILE = 3, 233 MANAGEMENT = 4, 234 ERGONOMIC = 5, 235 ATTACH_ON_DEMAND = 6, 236 INTERNAL = 7, 237 238 LAST_VALUE_ORIGIN = INTERNAL, 239 VALUE_ORIGIN_BITS = 4, 240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 241 242 // flag kind 243 KIND_PRODUCT = 1 << 4, 244 KIND_MANAGEABLE = 1 << 5, 245 KIND_DIAGNOSTIC = 1 << 6, 246 KIND_EXPERIMENTAL = 1 << 7, 247 KIND_NOT_PRODUCT = 1 << 8, 248 KIND_DEVELOP = 1 << 9, 249 KIND_PLATFORM_DEPENDENT = 1 << 10, 250 KIND_READ_WRITE = 1 << 11, 251 KIND_C1 = 1 << 12, 252 KIND_C2 = 1 << 13, 253 KIND_ARCH = 1 << 14, 254 KIND_SHARK = 1 << 15, 255 KIND_LP64_PRODUCT = 1 << 16, 256 KIND_COMMERCIAL = 1 << 17, 257 258 KIND_MASK = ~VALUE_ORIGIN_MASK 259 }; 260 261 enum Error { 262 // no error 263 SUCCESS = 0, 264 // flag name is missing 265 MISSING_NAME, 266 // flag value is missing 267 MISSING_VALUE, 268 // error parsing the textual form of the value 269 WRONG_FORMAT, 270 // flag is not writeable 271 NON_WRITABLE, 272 // flag value is outside of its bounds 273 OUT_OF_BOUNDS, 274 // flag value violates its constraint 275 VIOLATES_CONSTRAINT, 276 // there is no flag with the given name 277 INVALID_FLAG, 278 // other, unspecified error related to setting the flag 279 ERR_OTHER 280 }; 281 282 const char* _type; 283 const char* _name; 284 void* _addr; 285 NOT_PRODUCT(const char* _doc;) 286 Flags _flags; 287 288 // points to all Flags static array 289 static Flag* flags; 290 291 // number of flags 292 static size_t numFlags; 293 294 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 295 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 296 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 297 298 void check_writable(); 299 300 bool is_bool() const; 301 bool get_bool() const; 302 void set_bool(bool value); 303 304 bool is_int() const; 305 int get_int() const; 306 void set_int(int value); 307 308 bool is_uint() const; 309 uint get_uint() const; 310 void set_uint(uint value); 311 312 bool is_intx() const; 313 intx get_intx() const; 314 void set_intx(intx value); 315 316 bool is_uintx() const; 317 uintx get_uintx() const; 318 void set_uintx(uintx value); 319 320 bool is_uint64_t() const; 321 uint64_t get_uint64_t() const; 322 void set_uint64_t(uint64_t value); 323 324 bool is_size_t() const; 325 size_t get_size_t() const; 326 void set_size_t(size_t value); 327 328 bool is_double() const; 329 double get_double() const; 330 void set_double(double value); 331 332 bool is_ccstr() const; 333 bool ccstr_accumulates() const; 334 ccstr get_ccstr() const; 335 void set_ccstr(ccstr value); 336 337 Flags get_origin(); 338 void set_origin(Flags origin); 339 340 bool is_default(); 341 bool is_ergonomic(); 342 bool is_command_line(); 343 344 bool is_product() const; 345 bool is_manageable() const; 346 bool is_diagnostic() const; 347 bool is_experimental() const; 348 bool is_notproduct() const; 349 bool is_develop() const; 350 bool is_read_write() const; 351 bool is_commercial() const; 352 353 bool is_constant_in_binary() const; 354 355 bool is_unlocker() const; 356 bool is_unlocked() const; 357 bool is_writeable() const; 358 bool is_external() const; 359 360 bool is_unlocker_ext() const; 361 bool is_unlocked_ext() const; 362 bool is_writeable_ext() const; 363 bool is_external_ext() const; 364 365 void unlock_diagnostic(); 366 367 void get_locked_message(char*, int) const; 368 void get_locked_message_ext(char*, int) const; 369 370 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 371 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 372 void print_kind(outputStream* st); 373 void print_as_flag(outputStream* st); 374 375 static const char* flag_error_str(Flag::Error error) { 376 switch (error) { 377 case Flag::MISSING_NAME: return "MISSING_NAME"; 378 case Flag::MISSING_VALUE: return "MISSING_VALUE"; 379 case Flag::NON_WRITABLE: return "NON_WRITABLE"; 380 case Flag::OUT_OF_BOUNDS: return "OUT_OF_BOUNDS"; 381 case Flag::VIOLATES_CONSTRAINT: return "VIOLATES_CONSTRAINT"; 382 case Flag::INVALID_FLAG: return "INVALID_FLAG"; 383 case Flag::ERR_OTHER: return "ERR_OTHER"; 384 case Flag::SUCCESS: return "SUCCESS"; 385 default: return "NULL"; 386 } 387 } 388}; 389 390// debug flags control various aspects of the VM and are global accessible 391 392// use FlagSetting to temporarily change some debug flag 393// e.g. FlagSetting fs(DebugThisAndThat, true); 394// restored to previous value upon leaving scope 395class FlagSetting { 396 bool val; 397 bool* flag; 398 public: 399 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 400 ~FlagSetting() { *flag = val; } 401}; 402 403 404class CounterSetting { 405 intx* counter; 406 public: 407 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 408 ~CounterSetting() { (*counter)--; } 409}; 410 411class IntFlagSetting { 412 int val; 413 int* flag; 414 public: 415 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 416 ~IntFlagSetting() { *flag = val; } 417}; 418 419class UIntFlagSetting { 420 uint val; 421 uint* flag; 422 public: 423 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 424 ~UIntFlagSetting() { *flag = val; } 425}; 426 427class UIntXFlagSetting { 428 uintx val; 429 uintx* flag; 430 public: 431 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 432 ~UIntXFlagSetting() { *flag = val; } 433}; 434 435class DoubleFlagSetting { 436 double val; 437 double* flag; 438 public: 439 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 440 ~DoubleFlagSetting() { *flag = val; } 441}; 442 443class SizeTFlagSetting { 444 size_t val; 445 size_t* flag; 446 public: 447 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 448 ~SizeTFlagSetting() { *flag = val; } 449}; 450 451 452class CommandLineFlags { 453 static bool _finished_initializing; 454public: 455 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 456 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 457 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 458 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 459 460 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 461 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); } 462 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 463 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 464 465 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 466 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 467 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 468 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 469 470 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 471 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 472 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 473 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 474 475 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 476 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 477 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 478 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 479 480 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 481 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); } 482 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 483 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 484 485 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 486 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 487 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 488 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 489 490 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 491 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 492 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 493 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 494 495 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 496 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 497 // Contract: Flag will make private copy of the incoming value. 498 // Outgoing value is always malloc-ed, and caller MUST call free. 499 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 500 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 501 502 // Returns false if name is not a command line flag. 503 static bool wasSetOnCmdline(const char* name, bool* value); 504 static void printSetFlags(outputStream* out); 505 506 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 507 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 508 509 // Returns true if all flags have their final values set (ready for ranges and constraint check) 510 static bool finishedInitializing() { return _finished_initializing; } 511 512 // Check the final values of all flags for ranges and constraints 513 static bool check_all_ranges_and_constraints(); 514 515 static void verify() PRODUCT_RETURN; 516}; 517 518// use this for flags that are true by default in the debug version but 519// false in the optimized version, and vice versa 520#ifdef ASSERT 521#define trueInDebug true 522#define falseInDebug false 523#else 524#define trueInDebug false 525#define falseInDebug true 526#endif 527 528// use this for flags that are true per default in the product build 529// but false in development builds, and vice versa 530#ifdef PRODUCT 531#define trueInProduct true 532#define falseInProduct false 533#else 534#define trueInProduct false 535#define falseInProduct true 536#endif 537 538#ifdef JAVASE_EMBEDDED 539#define falseInEmbedded false 540#else 541#define falseInEmbedded true 542#endif 543 544// develop flags are settable / visible only during development and are constant in the PRODUCT version 545// product flags are always settable / visible 546// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 547 548// A flag must be declared with one of the following types: 549// bool, intx, uintx, size_t, ccstr, double, or uint64_t. 550// The type "ccstr" is an alias for "const char*" and is used 551// only in this file, because the macrology requires single-token type names. 552 553// Note: Diagnostic options not meant for VM tuning or for product modes. 554// They are to be used for VM quality assurance or field diagnosis 555// of VM bugs. They are hidden so that users will not be encouraged to 556// try them as if they were VM ordinary execution options. However, they 557// are available in the product version of the VM. Under instruction 558// from support engineers, VM customers can turn them on to collect 559// diagnostic information about VM problems. To use a VM diagnostic 560// option, you must first specify +UnlockDiagnosticVMOptions. 561// (This master switch also affects the behavior of -Xprintflags.) 562// 563// experimental flags are in support of features that are not 564// part of the officially supported product, but are available 565// for experimenting with. They could, for example, be performance 566// features that may not have undergone full or rigorous QA, but which may 567// help performance in some cases and released for experimentation 568// by the community of users and developers. This flag also allows one to 569// be able to build a fully supported product that nonetheless also 570// ships with some unsupported, lightly tested, experimental features. 571// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 572// UnlockExperimentalVMOptions flag, which allows the control and 573// modification of the experimental flags. 574// 575// Nota bene: neither diagnostic nor experimental options should be used casually, 576// and they are not supported on production loads, except under explicit 577// direction from support engineers. 578// 579// manageable flags are writeable external product flags. 580// They are dynamically writeable through the JDK management interface 581// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 582// These flags are external exported interface (see CCC). The list of 583// manageable flags can be queried programmatically through the management 584// interface. 585// 586// A flag can be made as "manageable" only if 587// - the flag is defined in a CCC as an external exported interface. 588// - the VM implementation supports dynamic setting of the flag. 589// This implies that the VM must *always* query the flag variable 590// and not reuse state related to the flag state at any given time. 591// - you want the flag to be queried programmatically by the customers. 592// 593// product_rw flags are writeable internal product flags. 594// They are like "manageable" flags but for internal/private use. 595// The list of product_rw flags are internal/private flags which 596// may be changed/removed in a future release. It can be set 597// through the management interface to get/set value 598// when the name of flag is supplied. 599// 600// A flag can be made as "product_rw" only if 601// - the VM implementation supports dynamic setting of the flag. 602// This implies that the VM must *always* query the flag variable 603// and not reuse state related to the flag state at any given time. 604// 605// Note that when there is a need to support develop flags to be writeable, 606// it can be done in the same way as product_rw. 607// 608// range is a macro that will expand to min and max arguments for range 609// checking code if provided - see commandLineFlagRangeList.hpp 610// 611// constraint is a macro that will expand to custom function call 612// for constraint checking if provided - see commandLineFlagConstraintList.hpp 613// 614 615#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 616 \ 617 lp64_product(bool, UseCompressedOops, false, \ 618 "Use 32-bit object references in 64-bit VM. " \ 619 "lp64_product means flag is always constant in 32 bit VM") \ 620 \ 621 lp64_product(bool, UseCompressedClassPointers, false, \ 622 "Use 32-bit class pointers in 64-bit VM. " \ 623 "lp64_product means flag is always constant in 32 bit VM") \ 624 \ 625 notproduct(bool, CheckCompressedOops, true, \ 626 "Generate checks in encoding/decoding code in debug VM") \ 627 \ 628 product_pd(size_t, HeapBaseMinAddress, \ 629 "OS specific low limit for heap base address") \ 630 \ 631 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 632 "Heap allocation steps through preferred address regions to find" \ 633 " where it can allocate the heap. Number of steps to take per " \ 634 "region.") \ 635 range(1, max_uintx) \ 636 \ 637 diagnostic(bool, PrintCompressedOopsMode, false, \ 638 "Print compressed oops base address and encoding mode") \ 639 \ 640 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 641 "Default object alignment in bytes, 8 is minimum") \ 642 range(8, 256) \ 643 constraint(ObjectAlignmentInBytesConstraintFunc) \ 644 \ 645 product(bool, AssumeMP, false, \ 646 "Instruct the VM to assume multiple processors are available") \ 647 \ 648 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 649 /* removal testing. It was supposed to be removed before FCS but has */ \ 650 /* been re-added (see 6401008) */ \ 651 product_pd(bool, UseMembar, \ 652 "(Unstable) Issues membars on thread state transitions") \ 653 \ 654 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 655 "Clean the chunk pool asynchronously") \ 656 \ 657 experimental(bool, AlwaysSafeConstructors, false, \ 658 "Force safe construction, as if all fields are final.") \ 659 \ 660 /* Temporary: See 6948537 */ \ 661 experimental(bool, UseMemSetInBOT, true, \ 662 "(Unstable) uses memset in BOT updates in GC code") \ 663 \ 664 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 665 "Enable normal processing of flags relating to field diagnostics")\ 666 \ 667 experimental(bool, UnlockExperimentalVMOptions, false, \ 668 "Enable normal processing of flags relating to experimental " \ 669 "features") \ 670 \ 671 product(bool, JavaMonitorsInStackTrace, true, \ 672 "Print information about Java monitor locks when the stacks are" \ 673 "dumped") \ 674 \ 675 product_pd(bool, UseLargePages, \ 676 "Use large page memory") \ 677 \ 678 product_pd(bool, UseLargePagesIndividualAllocation, \ 679 "Allocate large pages individually for better affinity") \ 680 \ 681 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 682 "Fail large pages individual allocation") \ 683 \ 684 product(bool, UseLargePagesInMetaspace, false, \ 685 "Use large page memory in metaspace. " \ 686 "Only used if UseLargePages is enabled.") \ 687 \ 688 develop(bool, TracePageSizes, false, \ 689 "Trace page size selection and usage") \ 690 \ 691 product(bool, UseNUMA, false, \ 692 "Use NUMA if available") \ 693 \ 694 product(bool, UseNUMAInterleaving, false, \ 695 "Interleave memory across NUMA nodes if available") \ 696 \ 697 product(size_t, NUMAInterleaveGranularity, 2*M, \ 698 "Granularity to use for NUMA interleaving on Windows OS") \ 699 \ 700 product(bool, ForceNUMA, false, \ 701 "Force NUMA optimizations on single-node/UMA systems") \ 702 \ 703 product(uintx, NUMAChunkResizeWeight, 20, \ 704 "Percentage (0-100) used to weight the current sample when " \ 705 "computing exponentially decaying average for " \ 706 "AdaptiveNUMAChunkSizing") \ 707 range(0, 100) \ 708 \ 709 product(size_t, NUMASpaceResizeRate, 1*G, \ 710 "Do not reallocate more than this amount per collection") \ 711 \ 712 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 713 "Enable adaptive chunk sizing for NUMA") \ 714 \ 715 product(bool, NUMAStats, false, \ 716 "Print NUMA stats in detailed heap information") \ 717 \ 718 product(uintx, NUMAPageScanRate, 256, \ 719 "Maximum number of pages to include in the page scan procedure") \ 720 \ 721 product_pd(bool, NeedsDeoptSuspend, \ 722 "True for register window machines (sparc/ia64)") \ 723 \ 724 product(intx, UseSSE, 99, \ 725 "Highest supported SSE instructions set on x86/x64") \ 726 \ 727 product(bool, UseAES, false, \ 728 "Control whether AES instructions can be used on x86/x64") \ 729 \ 730 product(bool, UseSHA, false, \ 731 "Control whether SHA instructions can be used on SPARC") \ 732 \ 733 product(bool, UseGHASHIntrinsics, false, \ 734 "Use intrinsics for GHASH versions of crypto") \ 735 \ 736 product(size_t, LargePageSizeInBytes, 0, \ 737 "Large page size (0 to let VM choose the page size)") \ 738 \ 739 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 740 "Use large pages if maximum heap is at least this big") \ 741 \ 742 product(bool, ForceTimeHighResolution, false, \ 743 "Using high time resolution (for Win32 only)") \ 744 \ 745 develop(bool, TraceItables, false, \ 746 "Trace initialization and use of itables") \ 747 \ 748 develop(bool, TracePcPatching, false, \ 749 "Trace usage of frame::patch_pc") \ 750 \ 751 develop(bool, TraceJumps, false, \ 752 "Trace assembly jumps in thread ring buffer") \ 753 \ 754 develop(bool, TraceRelocator, false, \ 755 "Trace the bytecode relocator") \ 756 \ 757 develop(bool, TraceLongCompiles, false, \ 758 "Print out every time compilation is longer than " \ 759 "a given threshold") \ 760 \ 761 develop(bool, SafepointALot, false, \ 762 "Generate a lot of safepoints. This works with " \ 763 "GuaranteedSafepointInterval") \ 764 \ 765 product_pd(bool, BackgroundCompilation, \ 766 "A thread requesting compilation is not blocked during " \ 767 "compilation") \ 768 \ 769 product(bool, PrintVMQWaitTime, false, \ 770 "Print out the waiting time in VM operation queue") \ 771 \ 772 develop(bool, TraceOopMapGeneration, false, \ 773 "Show OopMapGeneration") \ 774 \ 775 product(bool, MethodFlushing, true, \ 776 "Reclamation of zombie and not-entrant methods") \ 777 \ 778 develop(bool, VerifyStack, false, \ 779 "Verify stack of each thread when it is entering a runtime call") \ 780 \ 781 diagnostic(bool, ForceUnreachable, false, \ 782 "Make all non code cache addresses to be unreachable by " \ 783 "forcing use of 64bit literal fixups") \ 784 \ 785 notproduct(bool, StressDerivedPointers, false, \ 786 "Force scavenge when a derived pointer is detected on stack " \ 787 "after rtm call") \ 788 \ 789 develop(bool, TraceDerivedPointers, false, \ 790 "Trace traversal of derived pointers on stack") \ 791 \ 792 notproduct(bool, TraceCodeBlobStacks, false, \ 793 "Trace stack-walk of codeblobs") \ 794 \ 795 product(bool, PrintJNIResolving, false, \ 796 "Used to implement -v:jni") \ 797 \ 798 notproduct(bool, PrintRewrites, false, \ 799 "Print methods that are being rewritten") \ 800 \ 801 product(bool, UseInlineCaches, true, \ 802 "Use Inline Caches for virtual calls ") \ 803 \ 804 develop(bool, InlineArrayCopy, true, \ 805 "Inline arraycopy native that is known to be part of " \ 806 "base library DLL") \ 807 \ 808 develop(bool, InlineObjectHash, true, \ 809 "Inline Object::hashCode() native that is known to be part " \ 810 "of base library DLL") \ 811 \ 812 develop(bool, InlineNatives, true, \ 813 "Inline natives that are known to be part of base library DLL") \ 814 \ 815 develop(bool, InlineMathNatives, true, \ 816 "Inline SinD, CosD, etc.") \ 817 \ 818 develop(bool, InlineClassNatives, true, \ 819 "Inline Class.isInstance, etc") \ 820 \ 821 develop(bool, InlineThreadNatives, true, \ 822 "Inline Thread.currentThread, etc") \ 823 \ 824 develop(bool, InlineUnsafeOps, true, \ 825 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 826 \ 827 product(bool, CriticalJNINatives, true, \ 828 "Check for critical JNI entry points") \ 829 \ 830 notproduct(bool, StressCriticalJNINatives, false, \ 831 "Exercise register saving code in critical natives") \ 832 \ 833 product(bool, UseSSE42Intrinsics, false, \ 834 "SSE4.2 versions of intrinsics") \ 835 \ 836 product(bool, UseAESIntrinsics, false, \ 837 "Use intrinsics for AES versions of crypto") \ 838 \ 839 product(bool, UseSHA1Intrinsics, false, \ 840 "Use intrinsics for SHA-1 crypto hash function") \ 841 \ 842 product(bool, UseSHA256Intrinsics, false, \ 843 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 844 \ 845 product(bool, UseSHA512Intrinsics, false, \ 846 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 847 \ 848 product(bool, UseCRC32Intrinsics, false, \ 849 "use intrinsics for java.util.zip.CRC32") \ 850 \ 851 develop(bool, TraceCallFixup, false, \ 852 "Trace all call fixups") \ 853 \ 854 develop(bool, DeoptimizeALot, false, \ 855 "Deoptimize at every exit from the runtime system") \ 856 \ 857 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 858 "A comma separated list of bcis to deoptimize at") \ 859 \ 860 product(bool, DeoptimizeRandom, false, \ 861 "Deoptimize random frames on random exit from the runtime system")\ 862 \ 863 notproduct(bool, ZombieALot, false, \ 864 "Create zombies (non-entrant) at exit from the runtime system") \ 865 \ 866 product(bool, UnlinkSymbolsALot, false, \ 867 "Unlink unreferenced symbols from the symbol table at safepoints")\ 868 \ 869 notproduct(bool, WalkStackALot, false, \ 870 "Trace stack (no print) at every exit from the runtime system") \ 871 \ 872 product(bool, Debugging, false, \ 873 "Set when executing debug methods in debug.cpp " \ 874 "(to prevent triggering assertions)") \ 875 \ 876 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 877 "Enable strict checks that safepoints cannot happen for threads " \ 878 "that use No_Safepoint_Verifier") \ 879 \ 880 notproduct(bool, VerifyLastFrame, false, \ 881 "Verify oops on last frame on entry to VM") \ 882 \ 883 develop(bool, TraceHandleAllocation, false, \ 884 "Print out warnings when suspiciously many handles are allocated")\ 885 \ 886 product(bool, FailOverToOldVerifier, true, \ 887 "Fail over to old verifier when split verifier fails") \ 888 \ 889 develop(bool, ShowSafepointMsgs, false, \ 890 "Show message about safepoint synchronization") \ 891 \ 892 product(bool, SafepointTimeout, false, \ 893 "Time out and warn or fail after SafepointTimeoutDelay " \ 894 "milliseconds if failed to reach safepoint") \ 895 \ 896 develop(bool, DieOnSafepointTimeout, false, \ 897 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 898 \ 899 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 900 /* typically, at most a few retries are needed */ \ 901 product(intx, SuspendRetryCount, 50, \ 902 "Maximum retry count for an external suspend request") \ 903 \ 904 product(intx, SuspendRetryDelay, 5, \ 905 "Milliseconds to delay per retry (* current_retry_count)") \ 906 \ 907 product(bool, AssertOnSuspendWaitFailure, false, \ 908 "Assert/Guarantee on external suspend wait failure") \ 909 \ 910 product(bool, TraceSuspendWaitFailures, false, \ 911 "Trace external suspend wait failures") \ 912 \ 913 product(bool, MaxFDLimit, true, \ 914 "Bump the number of file descriptors to maximum in Solaris") \ 915 \ 916 diagnostic(bool, LogEvents, true, \ 917 "Enable the various ring buffer event logs") \ 918 \ 919 diagnostic(uintx, LogEventsBufferEntries, 10, \ 920 "Number of ring buffer event logs") \ 921 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 922 \ 923 product(bool, BytecodeVerificationRemote, true, \ 924 "Enable the Java bytecode verifier for remote classes") \ 925 \ 926 product(bool, BytecodeVerificationLocal, false, \ 927 "Enable the Java bytecode verifier for local classes") \ 928 \ 929 develop(bool, ForceFloatExceptions, trueInDebug, \ 930 "Force exceptions on FP stack under/overflow") \ 931 \ 932 develop(bool, VerifyStackAtCalls, false, \ 933 "Verify that the stack pointer is unchanged after calls") \ 934 \ 935 develop(bool, TraceJavaAssertions, false, \ 936 "Trace java language assertions") \ 937 \ 938 notproduct(bool, CheckAssertionStatusDirectives, false, \ 939 "Temporary - see javaClasses.cpp") \ 940 \ 941 notproduct(bool, PrintMallocFree, false, \ 942 "Trace calls to C heap malloc/free allocation") \ 943 \ 944 product(bool, PrintOopAddress, false, \ 945 "Always print the location of the oop") \ 946 \ 947 notproduct(bool, VerifyCodeCache, false, \ 948 "Verify code cache on memory allocation/deallocation") \ 949 \ 950 develop(bool, ZapDeadCompiledLocals, false, \ 951 "Zap dead locals in compiler frames") \ 952 \ 953 notproduct(bool, ZapDeadLocalsOld, false, \ 954 "Zap dead locals (old version, zaps all frames when " \ 955 "entering the VM") \ 956 \ 957 notproduct(bool, CheckOopishValues, false, \ 958 "Warn if value contains oop (requires ZapDeadLocals)") \ 959 \ 960 develop(bool, UseMallocOnly, false, \ 961 "Use only malloc/free for allocation (no resource area/arena)") \ 962 \ 963 develop(bool, PrintMalloc, false, \ 964 "Print all malloc/free calls") \ 965 \ 966 develop(bool, PrintMallocStatistics, false, \ 967 "Print malloc/free statistics") \ 968 \ 969 develop(bool, ZapResourceArea, trueInDebug, \ 970 "Zap freed resource/arena space with 0xABABABAB") \ 971 \ 972 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 973 "Zap freed VM handle space with 0xBCBCBCBC") \ 974 \ 975 develop(bool, ZapJNIHandleArea, trueInDebug, \ 976 "Zap freed JNI handle space with 0xFEFEFEFE") \ 977 \ 978 notproduct(bool, ZapStackSegments, trueInDebug, \ 979 "Zap allocated/freed stack segments with 0xFADFADED") \ 980 \ 981 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 982 "Zap unused heap space with 0xBAADBABE") \ 983 \ 984 develop(bool, TraceZapUnusedHeapArea, false, \ 985 "Trace zapping of unused heap space") \ 986 \ 987 develop(bool, CheckZapUnusedHeapArea, false, \ 988 "Check zapping of unused heap space") \ 989 \ 990 develop(bool, ZapFillerObjects, trueInDebug, \ 991 "Zap filler objects with 0xDEAFBABE") \ 992 \ 993 develop(bool, PrintVMMessages, true, \ 994 "Print VM messages on console") \ 995 \ 996 product(bool, PrintGCApplicationConcurrentTime, false, \ 997 "Print the time the application has been running") \ 998 \ 999 product(bool, PrintGCApplicationStoppedTime, false, \ 1000 "Print the time the application has been stopped") \ 1001 \ 1002 diagnostic(bool, VerboseVerification, false, \ 1003 "Display detailed verification details") \ 1004 \ 1005 notproduct(uintx, ErrorHandlerTest, 0, \ 1006 "If > 0, provokes an error after VM initialization; the value " \ 1007 "determines which error to provoke. See test_error_handler() " \ 1008 "in debug.cpp.") \ 1009 \ 1010 notproduct(uintx, TestCrashInErrorHandler, 0, \ 1011 "If > 0, provokes an error inside VM error handler (a secondary " \ 1012 "crash). see test_error_handler() in debug.cpp.") \ 1013 \ 1014 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1015 "If true, tests SafeFetch inside error handler.") \ 1016 \ 1017 develop(bool, Verbose, false, \ 1018 "Print additional debugging information from other modes") \ 1019 \ 1020 develop(bool, PrintMiscellaneous, false, \ 1021 "Print uncategorized debugging information (requires +Verbose)") \ 1022 \ 1023 develop(bool, WizardMode, false, \ 1024 "Print much more debugging information") \ 1025 \ 1026 product(bool, ShowMessageBoxOnError, false, \ 1027 "Keep process alive on VM fatal error") \ 1028 \ 1029 product(bool, CreateCoredumpOnCrash, true, \ 1030 "Create core/mini dump on VM fatal error") \ 1031 \ 1032 product_pd(bool, UseOSErrorReporting, \ 1033 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1034 \ 1035 product(bool, SuppressFatalErrorMessage, false, \ 1036 "Report NO fatal error message (avoid deadlock)") \ 1037 \ 1038 product(ccstrlist, OnError, "", \ 1039 "Run user-defined commands on fatal error; see VMError.cpp " \ 1040 "for examples") \ 1041 \ 1042 product(ccstrlist, OnOutOfMemoryError, "", \ 1043 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1044 \ 1045 manageable(bool, HeapDumpBeforeFullGC, false, \ 1046 "Dump heap to file before any major stop-the-world GC") \ 1047 \ 1048 manageable(bool, HeapDumpAfterFullGC, false, \ 1049 "Dump heap to file after any major stop-the-world GC") \ 1050 \ 1051 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1052 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1053 \ 1054 manageable(ccstr, HeapDumpPath, NULL, \ 1055 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1056 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1057 "in the working directory)") \ 1058 \ 1059 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1060 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1061 "when the heap usage is larger than this") \ 1062 \ 1063 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1064 "Approximate segment size when generating a segmented heap dump") \ 1065 \ 1066 develop(bool, BreakAtWarning, false, \ 1067 "Execute breakpoint upon encountering VM warning") \ 1068 \ 1069 develop(bool, TraceVMOperation, false, \ 1070 "Trace VM operations") \ 1071 \ 1072 develop(bool, UseFakeTimers, false, \ 1073 "Tell whether the VM should use system time or a fake timer") \ 1074 \ 1075 product(ccstr, NativeMemoryTracking, "off", \ 1076 "Native memory tracking options") \ 1077 \ 1078 diagnostic(bool, PrintNMTStatistics, false, \ 1079 "Print native memory tracking summary data if it is on") \ 1080 \ 1081 diagnostic(bool, LogCompilation, false, \ 1082 "Log compilation activity in detail to LogFile") \ 1083 \ 1084 product(bool, PrintCompilation, false, \ 1085 "Print compilations") \ 1086 \ 1087 diagnostic(bool, TraceNMethodInstalls, false, \ 1088 "Trace nmethod installation") \ 1089 \ 1090 diagnostic(intx, ScavengeRootsInCode, 2, \ 1091 "0: do not allow scavengable oops in the code cache; " \ 1092 "1: allow scavenging from the code cache; " \ 1093 "2: emit as many constants as the compiler can see") \ 1094 range(0, 2) \ 1095 \ 1096 product(bool, AlwaysRestoreFPU, false, \ 1097 "Restore the FPU control word after every JNI call (expensive)") \ 1098 \ 1099 diagnostic(bool, PrintCompilation2, false, \ 1100 "Print additional statistics per compilation") \ 1101 \ 1102 diagnostic(bool, PrintAdapterHandlers, false, \ 1103 "Print code generated for i2c/c2i adapters") \ 1104 \ 1105 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1106 "Verify that i2c/c2i adapters are called properly") \ 1107 \ 1108 develop(bool, VerifyAdapterSharing, false, \ 1109 "Verify that the code for shared adapters is the equivalent") \ 1110 \ 1111 diagnostic(bool, PrintAssembly, false, \ 1112 "Print assembly code (using external disassembler.so)") \ 1113 \ 1114 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1115 "Print options string passed to disassembler.so") \ 1116 \ 1117 diagnostic(bool, PrintNMethods, false, \ 1118 "Print assembly code for nmethods when generated") \ 1119 \ 1120 diagnostic(bool, PrintNativeNMethods, false, \ 1121 "Print assembly code for native nmethods when generated") \ 1122 \ 1123 develop(bool, PrintDebugInfo, false, \ 1124 "Print debug information for all nmethods when generated") \ 1125 \ 1126 develop(bool, PrintRelocations, false, \ 1127 "Print relocation information for all nmethods when generated") \ 1128 \ 1129 develop(bool, PrintDependencies, false, \ 1130 "Print dependency information for all nmethods when generated") \ 1131 \ 1132 develop(bool, PrintExceptionHandlers, false, \ 1133 "Print exception handler tables for all nmethods when generated") \ 1134 \ 1135 develop(bool, StressCompiledExceptionHandlers, false, \ 1136 "Exercise compiled exception handlers") \ 1137 \ 1138 develop(bool, InterceptOSException, false, \ 1139 "Start debugger when an implicit OS (e.g. NULL) " \ 1140 "exception happens") \ 1141 \ 1142 product(bool, PrintCodeCache, false, \ 1143 "Print the code cache memory usage when exiting") \ 1144 \ 1145 develop(bool, PrintCodeCache2, false, \ 1146 "Print detailed usage information on the code cache when exiting")\ 1147 \ 1148 product(bool, PrintCodeCacheOnCompilation, false, \ 1149 "Print the code cache memory usage each time a method is " \ 1150 "compiled") \ 1151 \ 1152 diagnostic(bool, PrintStubCode, false, \ 1153 "Print generated stub code") \ 1154 \ 1155 product(bool, StackTraceInThrowable, true, \ 1156 "Collect backtrace in throwable when exception happens") \ 1157 \ 1158 product(bool, OmitStackTraceInFastThrow, true, \ 1159 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1160 \ 1161 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1162 "Print bytecode statistics when dumping profiler output") \ 1163 \ 1164 product(bool, ProfilerRecordPC, false, \ 1165 "Collect ticks for each 16 byte interval of compiled code") \ 1166 \ 1167 product(bool, ProfileVM, false, \ 1168 "Profile ticks that fall within VM (either in the VM Thread " \ 1169 "or VM code called through stubs)") \ 1170 \ 1171 product(bool, ProfileIntervals, false, \ 1172 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1173 \ 1174 notproduct(bool, ProfilerCheckIntervals, false, \ 1175 "Collect and print information on spacing of profiler ticks") \ 1176 \ 1177 product(bool, PrintWarnings, true, \ 1178 "Print JVM warnings to output stream") \ 1179 \ 1180 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1181 "Print warnings for stalled SpinLocks") \ 1182 \ 1183 product(bool, RegisterFinalizersAtInit, true, \ 1184 "Register finalizable objects at end of Object.<init> or " \ 1185 "after allocation") \ 1186 \ 1187 develop(bool, RegisterReferences, true, \ 1188 "Tell whether the VM should register soft/weak/final/phantom " \ 1189 "references") \ 1190 \ 1191 develop(bool, IgnoreRewrites, false, \ 1192 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1193 "This is unsafe!") \ 1194 \ 1195 develop(bool, PrintCodeCacheExtension, false, \ 1196 "Print extension of code cache") \ 1197 \ 1198 develop(bool, UsePrivilegedStack, true, \ 1199 "Enable the security JVM functions") \ 1200 \ 1201 develop(bool, ProtectionDomainVerification, true, \ 1202 "Verify protection domain before resolution in system dictionary")\ 1203 \ 1204 product(bool, ClassUnloading, true, \ 1205 "Do unloading of classes") \ 1206 \ 1207 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1208 "Do unloading of classes with a concurrent marking cycle") \ 1209 \ 1210 develop(bool, DisableStartThread, false, \ 1211 "Disable starting of additional Java threads " \ 1212 "(for debugging only)") \ 1213 \ 1214 develop(bool, MemProfiling, false, \ 1215 "Write memory usage profiling to log file") \ 1216 \ 1217 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1218 "Print the system dictionary at exit") \ 1219 \ 1220 experimental(intx, PredictedLoadedClassCount, 0, \ 1221 "Experimental: Tune loaded class cache starting size") \ 1222 \ 1223 diagnostic(bool, UnsyncloadClass, false, \ 1224 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1225 "class loader must call VM synchronized for findClass " \ 1226 "and defineClass.") \ 1227 \ 1228 product(bool, AlwaysLockClassLoader, false, \ 1229 "Require the VM to acquire the class loader lock before calling " \ 1230 "loadClass() even for class loaders registering " \ 1231 "as parallel capable") \ 1232 \ 1233 product(bool, AllowParallelDefineClass, false, \ 1234 "Allow parallel defineClass requests for class loaders " \ 1235 "registering as parallel capable") \ 1236 \ 1237 product(bool, MustCallLoadClassInternal, false, \ 1238 "Call loadClassInternal() rather than loadClass()") \ 1239 \ 1240 product_pd(bool, DontYieldALot, \ 1241 "Throw away obvious excess yield calls") \ 1242 \ 1243 product_pd(bool, ConvertSleepToYield, \ 1244 "Convert sleep(0) to thread yield " \ 1245 "(may be off for Solaris to improve GUI)") \ 1246 \ 1247 product(bool, ConvertYieldToSleep, false, \ 1248 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1249 "behavior") \ 1250 \ 1251 develop(bool, UseDetachedThreads, true, \ 1252 "Use detached threads that are recycled upon termination " \ 1253 "(for Solaris only)") \ 1254 \ 1255 product(bool, UseLWPSynchronization, true, \ 1256 "Use LWP-based instead of libthread-based synchronization " \ 1257 "(SPARC only)") \ 1258 \ 1259 experimental(ccstr, SyncKnobs, NULL, \ 1260 "(Unstable) Various monitor synchronization tunables") \ 1261 \ 1262 experimental(intx, EmitSync, 0, \ 1263 "(Unsafe, Unstable) " \ 1264 "Control emission of inline sync fast-path code") \ 1265 \ 1266 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1267 \ 1268 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1269 \ 1270 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1271 "Experimental Sync flags") \ 1272 \ 1273 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1274 \ 1275 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1276 \ 1277 experimental(intx, hashCode, 5, \ 1278 "(Unstable) select hashCode generation algorithm") \ 1279 \ 1280 experimental(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1281 "(Unstable, Linux-specific) " \ 1282 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1283 \ 1284 product(bool, FilterSpuriousWakeups, true, \ 1285 "When true prevents OS-level spurious, or premature, wakeups " \ 1286 "from Object.wait (Ignored for Windows)") \ 1287 \ 1288 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1289 \ 1290 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1291 \ 1292 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1293 \ 1294 develop(bool, UsePthreads, false, \ 1295 "Use pthread-based instead of libthread-based synchronization " \ 1296 "(SPARC only)") \ 1297 \ 1298 product(bool, ReduceSignalUsage, false, \ 1299 "Reduce the use of OS signals in Java and/or the VM") \ 1300 \ 1301 develop_pd(bool, ShareVtableStubs, \ 1302 "Share vtable stubs (smaller code but worse branch prediction") \ 1303 \ 1304 develop(bool, LoadLineNumberTables, true, \ 1305 "Tell whether the class file parser loads line number tables") \ 1306 \ 1307 develop(bool, LoadLocalVariableTables, true, \ 1308 "Tell whether the class file parser loads local variable tables") \ 1309 \ 1310 develop(bool, LoadLocalVariableTypeTables, true, \ 1311 "Tell whether the class file parser loads local variable type" \ 1312 "tables") \ 1313 \ 1314 product(bool, AllowUserSignalHandlers, false, \ 1315 "Do not complain if the application installs signal handlers " \ 1316 "(Solaris & Linux only)") \ 1317 \ 1318 product(bool, UseSignalChaining, true, \ 1319 "Use signal-chaining to invoke signal handlers installed " \ 1320 "by the application (Solaris & Linux only)") \ 1321 \ 1322 product(bool, UseAltSigs, false, \ 1323 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1324 "internal signals (Solaris only)") \ 1325 \ 1326 product(bool, AllowJNIEnvProxy, false, \ 1327 "Allow JNIEnv proxies for jdbx") \ 1328 \ 1329 product(bool, JNIDetachReleasesMonitors, true, \ 1330 "JNI DetachCurrentThread releases monitors owned by thread") \ 1331 \ 1332 product(bool, RestoreMXCSROnJNICalls, false, \ 1333 "Restore MXCSR when returning from JNI calls") \ 1334 \ 1335 product(bool, CheckJNICalls, false, \ 1336 "Verify all arguments to JNI calls") \ 1337 \ 1338 product(bool, CheckEndorsedAndExtDirs, false, \ 1339 "Verify the endorsed and extension directories are not used") \ 1340 \ 1341 product(bool, UseFastJNIAccessors, true, \ 1342 "Use optimized versions of Get<Primitive>Field") \ 1343 \ 1344 product(intx, MaxJNILocalCapacity, 65536, \ 1345 "Maximum allowable local JNI handle capacity to " \ 1346 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1347 "where <= 0 is unlimited, default: 65536") \ 1348 \ 1349 product(bool, EagerXrunInit, false, \ 1350 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1351 "but not all -Xrun libraries may support the state of the VM " \ 1352 "at this time") \ 1353 \ 1354 product(bool, PreserveAllAnnotations, false, \ 1355 "Preserve RuntimeInvisibleAnnotations as well " \ 1356 "as RuntimeVisibleAnnotations") \ 1357 \ 1358 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1359 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1360 \ 1361 product(bool, LazyBootClassLoader, true, \ 1362 "Enable/disable lazy opening of boot class path entries") \ 1363 \ 1364 product(bool, UseXMMForArrayCopy, false, \ 1365 "Use SSE2 MOVQ instruction for Arraycopy") \ 1366 \ 1367 product(intx, FieldsAllocationStyle, 1, \ 1368 "0 - type based with oops first, " \ 1369 "1 - with oops last, " \ 1370 "2 - oops in super and sub classes are together") \ 1371 range(0, 2) \ 1372 \ 1373 product(bool, CompactFields, true, \ 1374 "Allocate nonstatic fields in gaps between previous fields") \ 1375 \ 1376 notproduct(bool, PrintFieldLayout, false, \ 1377 "Print field layout for each class") \ 1378 \ 1379 /* Need to limit the extent of the padding to reasonable size. */\ 1380 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1381 /* aggressive prefetching, while still leaving the room for segregating */\ 1382 /* among the distinct pages. */\ 1383 product(intx, ContendedPaddingWidth, 128, \ 1384 "How many bytes to pad the fields/classes marked @Contended with")\ 1385 range(0, 8192) \ 1386 constraint(ContendedPaddingWidthConstraintFunc) \ 1387 \ 1388 product(bool, EnableContended, true, \ 1389 "Enable @Contended annotation support") \ 1390 \ 1391 product(bool, RestrictContended, true, \ 1392 "Restrict @Contended to trusted classes") \ 1393 \ 1394 product(bool, UseBiasedLocking, true, \ 1395 "Enable biased locking in JVM") \ 1396 \ 1397 product(intx, BiasedLockingStartupDelay, 4000, \ 1398 "Number of milliseconds to wait before enabling biased locking") \ 1399 \ 1400 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1401 "Print statistics of biased locking in JVM") \ 1402 \ 1403 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1404 "Threshold of number of revocations per type to try to " \ 1405 "rebias all objects in the heap of that type") \ 1406 \ 1407 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1408 "Threshold of number of revocations per type to permanently " \ 1409 "revoke biases of all objects in the heap of that type") \ 1410 \ 1411 product(intx, BiasedLockingDecayTime, 25000, \ 1412 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1413 "type after previous bulk rebias") \ 1414 \ 1415 /* tracing */ \ 1416 \ 1417 notproduct(bool, TraceRuntimeCalls, false, \ 1418 "Trace run-time calls") \ 1419 \ 1420 develop(bool, TraceJNICalls, false, \ 1421 "Trace JNI calls") \ 1422 \ 1423 develop(bool, StressRewriter, false, \ 1424 "Stress linktime bytecode rewriting") \ 1425 \ 1426 notproduct(bool, TraceJVMCalls, false, \ 1427 "Trace JVM calls") \ 1428 \ 1429 product(ccstr, TraceJVMTI, NULL, \ 1430 "Trace flags for JVMTI functions and events") \ 1431 \ 1432 /* This option can change an EMCP method into an obsolete method. */ \ 1433 /* This can affect tests that except specific methods to be EMCP. */ \ 1434 /* This option should be used with caution. */ \ 1435 product(bool, StressLdcRewrite, false, \ 1436 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1437 \ 1438 product(intx, TraceRedefineClasses, 0, \ 1439 "Trace level for JVMTI RedefineClasses") \ 1440 \ 1441 /* change to false by default sometime after Mustang */ \ 1442 product(bool, VerifyMergedCPBytecodes, true, \ 1443 "Verify bytecodes after RedefineClasses constant pool merging") \ 1444 \ 1445 develop(bool, TraceJNIHandleAllocation, false, \ 1446 "Trace allocation/deallocation of JNI handle blocks") \ 1447 \ 1448 develop(bool, TraceBytecodes, false, \ 1449 "Trace bytecode execution") \ 1450 \ 1451 develop(bool, TraceClassInitialization, false, \ 1452 "Trace class initialization") \ 1453 \ 1454 product(bool, TraceExceptions, false, \ 1455 "Trace exceptions") \ 1456 \ 1457 develop(bool, TraceICs, false, \ 1458 "Trace inline cache changes") \ 1459 \ 1460 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1461 "Trace method invocation counter overflow") \ 1462 \ 1463 develop(bool, TraceInlineCacheClearing, false, \ 1464 "Trace clearing of inline caches in nmethods") \ 1465 \ 1466 develop(bool, TraceDependencies, false, \ 1467 "Trace dependencies") \ 1468 \ 1469 develop(bool, VerifyDependencies, trueInDebug, \ 1470 "Exercise and verify the compilation dependency mechanism") \ 1471 \ 1472 develop(bool, TraceNewOopMapGeneration, false, \ 1473 "Trace OopMapGeneration") \ 1474 \ 1475 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1476 "Trace OopMapGeneration: print detailed cell states") \ 1477 \ 1478 develop(bool, TimeOopMap, false, \ 1479 "Time calls to GenerateOopMap::compute_map() in sum") \ 1480 \ 1481 develop(bool, TimeOopMap2, false, \ 1482 "Time calls to GenerateOopMap::compute_map() individually") \ 1483 \ 1484 develop(bool, TraceMonitorMismatch, false, \ 1485 "Trace monitor matching failures during OopMapGeneration") \ 1486 \ 1487 develop(bool, TraceOopMapRewrites, false, \ 1488 "Trace rewriting of method oops during oop map generation") \ 1489 \ 1490 develop(bool, TraceSafepoint, false, \ 1491 "Trace safepoint operations") \ 1492 \ 1493 develop(bool, TraceICBuffer, false, \ 1494 "Trace usage of IC buffer") \ 1495 \ 1496 develop(bool, TraceCompiledIC, false, \ 1497 "Trace changes of compiled IC") \ 1498 \ 1499 notproduct(bool, TraceZapDeadLocals, false, \ 1500 "Trace zapping dead locals") \ 1501 \ 1502 develop(bool, TraceStartupTime, false, \ 1503 "Trace setup time") \ 1504 \ 1505 develop(bool, TraceProtectionDomainVerification, false, \ 1506 "Trace protection domain verification") \ 1507 \ 1508 develop(bool, TraceClearedExceptions, false, \ 1509 "Print when an exception is forcibly cleared") \ 1510 \ 1511 product(bool, TraceClassResolution, false, \ 1512 "Trace all constant pool resolutions (for debugging)") \ 1513 \ 1514 product(bool, TraceBiasedLocking, false, \ 1515 "Trace biased locking in JVM") \ 1516 \ 1517 product(bool, TraceMonitorInflation, false, \ 1518 "Trace monitor inflation in JVM") \ 1519 \ 1520 /* gc */ \ 1521 \ 1522 product(bool, UseSerialGC, false, \ 1523 "Use the Serial garbage collector") \ 1524 \ 1525 product(bool, UseG1GC, false, \ 1526 "Use the Garbage-First garbage collector") \ 1527 \ 1528 product(bool, UseParallelGC, false, \ 1529 "Use the Parallel Scavenge garbage collector") \ 1530 \ 1531 product(bool, UseParallelOldGC, false, \ 1532 "Use the Parallel Old garbage collector") \ 1533 \ 1534 product(uintx, HeapMaximumCompactionInterval, 20, \ 1535 "How often should we maximally compact the heap (not allowing " \ 1536 "any dead space)") \ 1537 \ 1538 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1539 "The collection count for the first maximum compaction") \ 1540 \ 1541 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1542 "Use maximum compaction in the Parallel Old garbage collector " \ 1543 "for a system GC") \ 1544 \ 1545 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1546 "The mean used by the parallel compact dead wood " \ 1547 "limiter (a number between 0-100)") \ 1548 range(0, 100) \ 1549 \ 1550 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1551 "The standard deviation used by the parallel compact dead wood " \ 1552 "limiter (a number between 0-100)") \ 1553 range(0, 100) \ 1554 \ 1555 product(uint, ParallelGCThreads, 0, \ 1556 "Number of parallel threads parallel gc will use") \ 1557 \ 1558 product(bool, UseDynamicNumberOfGCThreads, false, \ 1559 "Dynamically choose the number of parallel threads " \ 1560 "parallel gc will use") \ 1561 \ 1562 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1563 "Force dynamic selection of the number of " \ 1564 "parallel threads parallel gc will use to aid debugging") \ 1565 \ 1566 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1567 "Size of heap (bytes) per GC thread used in calculating the " \ 1568 "number of GC threads") \ 1569 range((uintx)os::vm_page_size(), max_uintx) \ 1570 \ 1571 product(bool, TraceDynamicGCThreads, false, \ 1572 "Trace the dynamic GC thread usage") \ 1573 \ 1574 develop(bool, ParallelOldGCSplitALot, false, \ 1575 "Provoke splitting (copying data from a young gen space to " \ 1576 "multiple destination spaces)") \ 1577 \ 1578 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1579 "How often to provoke splitting a young gen space") \ 1580 range(0, max_uintx) \ 1581 \ 1582 product(uint, ConcGCThreads, 0, \ 1583 "Number of threads concurrent gc will use") \ 1584 \ 1585 product(size_t, YoungPLABSize, 4096, \ 1586 "Size of young gen promotion LAB's (in HeapWords)") \ 1587 \ 1588 product(size_t, OldPLABSize, 1024, \ 1589 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1590 of blocks to attempt to claim when refilling CMS LAB's") \ 1591 \ 1592 product(uintx, GCTaskTimeStampEntries, 200, \ 1593 "Number of time stamp entries per gc worker thread") \ 1594 range(1, max_uintx) \ 1595 \ 1596 product(bool, AlwaysTenure, false, \ 1597 "Always tenure objects in eden (ParallelGC only)") \ 1598 \ 1599 product(bool, NeverTenure, false, \ 1600 "Never tenure objects in eden, may tenure on overflow " \ 1601 "(ParallelGC only)") \ 1602 \ 1603 product(bool, ScavengeBeforeFullGC, true, \ 1604 "Scavenge youngest generation before each full GC.") \ 1605 \ 1606 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1607 "Allow scavenges to occur when to-space contains objects") \ 1608 \ 1609 product(bool, UseConcMarkSweepGC, false, \ 1610 "Use Concurrent Mark-Sweep GC in the old generation") \ 1611 \ 1612 product(bool, ExplicitGCInvokesConcurrent, false, \ 1613 "A System.gc() request invokes a concurrent collection; " \ 1614 "(effective only when using concurrent collectors)") \ 1615 \ 1616 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1617 "A System.gc() request invokes a concurrent collection and " \ 1618 "also unloads classes during such a concurrent gc cycle " \ 1619 "(effective only when UseConcMarkSweepGC)") \ 1620 \ 1621 product(bool, GCLockerInvokesConcurrent, false, \ 1622 "The exit of a JNI critical section necessitating a scavenge, " \ 1623 "also kicks off a background concurrent collection") \ 1624 \ 1625 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1626 "How much the GC can expand the eden by while the GC locker " \ 1627 "is active (as a percentage)") \ 1628 range(0, 100) \ 1629 \ 1630 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1631 "Number of times to retry allocations when " \ 1632 "blocked by the GC locker") \ 1633 \ 1634 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1635 "Use adaptive free lists in the CMS generation") \ 1636 \ 1637 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1638 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1639 \ 1640 product(bool, UseCMSBestFit, true, \ 1641 "Use CMS best fit allocation strategy") \ 1642 \ 1643 product(bool, UseParNewGC, false, \ 1644 "Use parallel threads in the new generation") \ 1645 \ 1646 product(bool, PrintTaskqueue, false, \ 1647 "Print taskqueue statistics for parallel collectors") \ 1648 \ 1649 product(bool, PrintTerminationStats, false, \ 1650 "Print termination statistics for parallel collectors") \ 1651 \ 1652 product(uintx, ParallelGCBufferWastePct, 10, \ 1653 "Wasted fraction of parallel allocation buffer") \ 1654 range(0, 100) \ 1655 \ 1656 product(uintx, TargetPLABWastePct, 10, \ 1657 "Target wasted space in last buffer as percent of overall " \ 1658 "allocation") \ 1659 range(1, 100) \ 1660 \ 1661 product(uintx, PLABWeight, 75, \ 1662 "Percentage (0-100) used to weight the current sample when " \ 1663 "computing exponentially decaying average for ResizePLAB") \ 1664 range(0, 100) \ 1665 \ 1666 product(bool, ResizePLAB, true, \ 1667 "Dynamically resize (survivor space) promotion LAB's") \ 1668 \ 1669 product(bool, PrintPLAB, false, \ 1670 "Print (survivor space) promotion LAB's sizing decisions") \ 1671 \ 1672 product(intx, ParGCArrayScanChunk, 50, \ 1673 "Scan a subset of object array and push remainder, if array is " \ 1674 "bigger than this") \ 1675 range(1, max_intx) \ 1676 \ 1677 product(bool, ParGCUseLocalOverflow, false, \ 1678 "Instead of a global overflow list, use local overflow stacks") \ 1679 \ 1680 product(bool, ParGCTrimOverflow, true, \ 1681 "Eagerly trim the local overflow lists " \ 1682 "(when ParGCUseLocalOverflow)") \ 1683 \ 1684 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1685 "Simulate work queue overflow in ParNew") \ 1686 \ 1687 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1688 "An `interval' counter that determines how frequently " \ 1689 "we simulate overflow; a smaller number increases frequency") \ 1690 \ 1691 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1692 "The desired number of objects to claim from the overflow list") \ 1693 \ 1694 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1695 "The number of strides per worker thread that we divide up the " \ 1696 "card table scanning work into") \ 1697 range(1, max_uintx) \ 1698 \ 1699 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1700 "The number of cards in each chunk of the parallel chunks used " \ 1701 "during card table scanning") \ 1702 range(1, max_intx) \ 1703 \ 1704 product(uintx, OldPLABWeight, 50, \ 1705 "Percentage (0-100) used to weight the current sample when " \ 1706 "computing exponentially decaying average for resizing " \ 1707 "OldPLABSize") \ 1708 range(0, 100) \ 1709 \ 1710 product(bool, ResizeOldPLAB, true, \ 1711 "Dynamically resize (old gen) promotion LAB's") \ 1712 \ 1713 product(bool, PrintOldPLAB, false, \ 1714 "Print (old gen) promotion LAB's sizing decisions") \ 1715 \ 1716 product(size_t, CMSOldPLABMax, 1024, \ 1717 "Maximum size of CMS gen promotion LAB caches per worker " \ 1718 "per block size") \ 1719 range(1, max_uintx) \ 1720 \ 1721 product(size_t, CMSOldPLABMin, 16, \ 1722 "Minimum size of CMS gen promotion LAB caches per worker " \ 1723 "per block size") \ 1724 range(1, max_uintx) \ 1725 constraint(CMSOldPLABMinConstraintFunc) \ 1726 \ 1727 product(uintx, CMSOldPLABNumRefills, 4, \ 1728 "Nominal number of refills of CMS gen promotion LAB cache " \ 1729 "per worker per block size") \ 1730 range(1, max_uintx) \ 1731 \ 1732 product(bool, CMSOldPLABResizeQuicker, false, \ 1733 "React on-the-fly during a scavenge to a sudden " \ 1734 "change in block demand rate") \ 1735 \ 1736 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1737 "The tolerance of the phase-change detector for on-the-fly " \ 1738 "PLAB resizing during a scavenge") \ 1739 range(1, max_uintx) \ 1740 \ 1741 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1742 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1743 "during a scavenge") \ 1744 \ 1745 product(bool, AlwaysPreTouch, false, \ 1746 "Force all freshly committed pages to be pre-touched") \ 1747 \ 1748 product_pd(size_t, CMSYoungGenPerWorker, \ 1749 "The maximum size of young gen chosen by default per GC worker " \ 1750 "thread available") \ 1751 range(1, max_uintx) \ 1752 \ 1753 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1754 "Percentage (0-100) used to add conservatism when computing the " \ 1755 "duty cycle") \ 1756 range(0, 100) \ 1757 \ 1758 product(uintx, CMSExpAvgFactor, 50, \ 1759 "Percentage (0-100) used to weight the current sample when " \ 1760 "computing exponential averages for CMS statistics") \ 1761 range(0, 100) \ 1762 \ 1763 product(uintx, CMS_FLSWeight, 75, \ 1764 "Percentage (0-100) used to weight the current sample when " \ 1765 "computing exponentially decaying averages for CMS FLS " \ 1766 "statistics") \ 1767 range(0, 100) \ 1768 \ 1769 product(uintx, CMS_FLSPadding, 1, \ 1770 "The multiple of deviation from mean to use for buffering " \ 1771 "against volatility in free list demand") \ 1772 \ 1773 product(uintx, FLSCoalescePolicy, 2, \ 1774 "CMS: aggressiveness level for coalescing, increasing " \ 1775 "from 0 to 4") \ 1776 range(0, 4) \ 1777 \ 1778 product(bool, FLSAlwaysCoalesceLarge, false, \ 1779 "CMS: larger free blocks are always available for coalescing") \ 1780 \ 1781 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1782 "CMS: the smaller the percentage the greater the coalescing " \ 1783 "force") \ 1784 \ 1785 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1786 "CMS: the factor by which to inflate estimated demand of small " \ 1787 "block sizes to prevent coalescing with an adjoining block") \ 1788 \ 1789 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1790 "CMS: the factor by which to inflate estimated demand of large " \ 1791 "block sizes to prevent coalescing with an adjoining block") \ 1792 \ 1793 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1794 "CMS: the factor by which to inflate estimated demand of small " \ 1795 "block sizes to prevent splitting to supply demand for smaller " \ 1796 "blocks") \ 1797 \ 1798 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1799 "CMS: the factor by which to inflate estimated demand of large " \ 1800 "block sizes to prevent splitting to supply demand for smaller " \ 1801 "blocks") \ 1802 \ 1803 product(bool, CMSExtrapolateSweep, false, \ 1804 "CMS: cushion for block demand during sweep") \ 1805 \ 1806 product(uintx, CMS_SweepWeight, 75, \ 1807 "Percentage (0-100) used to weight the current sample when " \ 1808 "computing exponentially decaying average for inter-sweep " \ 1809 "duration") \ 1810 range(0, 100) \ 1811 \ 1812 product(uintx, CMS_SweepPadding, 1, \ 1813 "The multiple of deviation from mean to use for buffering " \ 1814 "against volatility in inter-sweep duration") \ 1815 \ 1816 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1817 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1818 "duration exceeds this threshold in milliseconds") \ 1819 \ 1820 product(bool, CMSClassUnloadingEnabled, true, \ 1821 "Whether class unloading enabled when using CMS GC") \ 1822 \ 1823 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1824 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1825 "count for which classes may not be unloaded") \ 1826 \ 1827 develop(intx, CMSDictionaryChoice, 0, \ 1828 "Use BinaryTreeDictionary as default in the CMS generation") \ 1829 \ 1830 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1831 "Replenish an indexed free list with this number of chunks") \ 1832 \ 1833 product(bool, CMSReplenishIntermediate, true, \ 1834 "Replenish all intermediate free-list caches") \ 1835 \ 1836 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1837 "When satisfying batched demand, split blocks from the " \ 1838 "IndexedFreeList whose size is a multiple of requested size") \ 1839 \ 1840 product(bool, CMSLoopWarn, false, \ 1841 "Warn in case of excessive CMS looping") \ 1842 \ 1843 develop(bool, CMSOverflowEarlyRestoration, false, \ 1844 "Restore preserved marks early") \ 1845 \ 1846 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1847 "Size of marking stack") \ 1848 \ 1849 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1850 "Maximum size of marking stack") \ 1851 range(1, (max_jint - 1)) \ 1852 \ 1853 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1854 "Simulate frequent marking stack / work queue overflow") \ 1855 \ 1856 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1857 "An \"interval\" counter that determines how frequently " \ 1858 "to simulate overflow; a smaller number increases frequency") \ 1859 \ 1860 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1861 "Maximum number of abortable preclean iterations, if > 0") \ 1862 \ 1863 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1864 "Maximum time in abortable preclean (in milliseconds)") \ 1865 \ 1866 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1867 "Nominal minimum work per abortable preclean iteration") \ 1868 \ 1869 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1870 "Time that we sleep between iterations when not given " \ 1871 "enough work per iteration") \ 1872 \ 1873 product(size_t, CMSRescanMultiple, 32, \ 1874 "Size (in cards) of CMS parallel rescan task") \ 1875 range(1, max_uintx) \ 1876 \ 1877 product(size_t, CMSConcMarkMultiple, 32, \ 1878 "Size (in cards) of CMS concurrent MT marking task") \ 1879 range(1, max_uintx) \ 1880 \ 1881 product(bool, CMSAbortSemantics, false, \ 1882 "Whether abort-on-overflow semantics is implemented") \ 1883 \ 1884 product(bool, CMSParallelInitialMarkEnabled, true, \ 1885 "Use the parallel initial mark.") \ 1886 \ 1887 product(bool, CMSParallelRemarkEnabled, true, \ 1888 "Whether parallel remark enabled (only if ParNewGC)") \ 1889 \ 1890 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1891 "Whether parallel remark of survivor space " \ 1892 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1893 \ 1894 product(bool, CMSPLABRecordAlways, true, \ 1895 "Always record survivor space PLAB boundaries (effective only " \ 1896 "if CMSParallelSurvivorRemarkEnabled)") \ 1897 \ 1898 product(bool, CMSEdenChunksRecordAlways, true, \ 1899 "Always record eden chunks used for the parallel initial mark " \ 1900 "or remark of eden") \ 1901 \ 1902 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1903 "Print the eden and the survivor chunks used for the parallel " \ 1904 "initial mark or remark of the eden/survivor spaces") \ 1905 \ 1906 product(bool, CMSConcurrentMTEnabled, true, \ 1907 "Whether multi-threaded concurrent work enabled " \ 1908 "(effective only if ParNewGC)") \ 1909 \ 1910 product(bool, CMSPrecleaningEnabled, true, \ 1911 "Whether concurrent precleaning enabled") \ 1912 \ 1913 product(uintx, CMSPrecleanIter, 3, \ 1914 "Maximum number of precleaning iteration passes") \ 1915 range(0, 9) \ 1916 \ 1917 product(uintx, CMSPrecleanDenominator, 3, \ 1918 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1919 "ratio") \ 1920 range(1, max_uintx) \ 1921 constraint(CMSPrecleanDenominatorConstraintFunc) \ 1922 \ 1923 product(uintx, CMSPrecleanNumerator, 2, \ 1924 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1925 "ratio") \ 1926 range(0, max_uintx-1) \ 1927 constraint(CMSPrecleanNumeratorConstraintFunc) \ 1928 \ 1929 product(bool, CMSPrecleanRefLists1, true, \ 1930 "Preclean ref lists during (initial) preclean phase") \ 1931 \ 1932 product(bool, CMSPrecleanRefLists2, false, \ 1933 "Preclean ref lists during abortable preclean phase") \ 1934 \ 1935 product(bool, CMSPrecleanSurvivors1, false, \ 1936 "Preclean survivors during (initial) preclean phase") \ 1937 \ 1938 product(bool, CMSPrecleanSurvivors2, true, \ 1939 "Preclean survivors during abortable preclean phase") \ 1940 \ 1941 product(uintx, CMSPrecleanThreshold, 1000, \ 1942 "Do not iterate again if number of dirty cards is less than this")\ 1943 range(100, max_uintx) \ 1944 \ 1945 product(bool, CMSCleanOnEnter, true, \ 1946 "Clean-on-enter optimization for reducing number of dirty cards") \ 1947 \ 1948 product(uintx, CMSRemarkVerifyVariant, 1, \ 1949 "Choose variant (1,2) of verification following remark") \ 1950 range(1, 2) \ 1951 \ 1952 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1953 "If Eden size is below this, do not try to schedule remark") \ 1954 \ 1955 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1956 "The Eden occupancy percentage (0-100) at which " \ 1957 "to try and schedule remark pause") \ 1958 range(0, 100) \ 1959 \ 1960 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1961 "Start sampling eden top at least before young gen " \ 1962 "occupancy reaches 1/<ratio> of the size at which " \ 1963 "we plan to schedule remark") \ 1964 range(1, max_uintx) \ 1965 \ 1966 product(uintx, CMSSamplingGrain, 16*K, \ 1967 "The minimum distance between eden samples for CMS (see above)") \ 1968 range(1, max_uintx) \ 1969 \ 1970 product(bool, CMSScavengeBeforeRemark, false, \ 1971 "Attempt scavenge before the CMS remark step") \ 1972 \ 1973 develop(bool, CMSTraceSweeper, false, \ 1974 "Trace some actions of the CMS sweeper") \ 1975 \ 1976 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1977 "Don't drain below this size per parallel worker/thief") \ 1978 \ 1979 manageable(intx, CMSWaitDuration, 2000, \ 1980 "Time in milliseconds that CMS thread waits for young GC") \ 1981 \ 1982 develop(uintx, CMSCheckInterval, 1000, \ 1983 "Interval in milliseconds that CMS thread checks if it " \ 1984 "should start a collection cycle") \ 1985 \ 1986 product(bool, CMSYield, true, \ 1987 "Yield between steps of CMS") \ 1988 \ 1989 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1990 "Bitmap operations should process at most this many bits " \ 1991 "between yields") \ 1992 range(1, max_uintx) \ 1993 \ 1994 product(bool, CMSDumpAtPromotionFailure, false, \ 1995 "Dump useful information about the state of the CMS old " \ 1996 "generation upon a promotion failure") \ 1997 \ 1998 product(bool, CMSPrintChunksInDump, false, \ 1999 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2000 "more detailed information about the free chunks") \ 2001 \ 2002 product(bool, CMSPrintObjectsInDump, false, \ 2003 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2004 "more detailed information about the allocated objects") \ 2005 \ 2006 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 2007 "Verify that all references across the FLS boundary " \ 2008 "are to valid objects") \ 2009 \ 2010 diagnostic(bool, FLSVerifyLists, false, \ 2011 "Do lots of (expensive) FreeListSpace verification") \ 2012 \ 2013 diagnostic(bool, FLSVerifyIndexTable, false, \ 2014 "Do lots of (expensive) FLS index table verification") \ 2015 \ 2016 develop(bool, FLSVerifyDictionary, false, \ 2017 "Do lots of (expensive) FLS dictionary verification") \ 2018 \ 2019 develop(bool, VerifyBlockOffsetArray, false, \ 2020 "Do (expensive) block offset array verification") \ 2021 \ 2022 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2023 "Maintain _unallocated_block in BlockOffsetArray " \ 2024 "(currently applicable only to CMS collector)") \ 2025 \ 2026 develop(bool, TraceCMSState, false, \ 2027 "Trace the state of the CMS collection") \ 2028 \ 2029 product(intx, RefDiscoveryPolicy, 0, \ 2030 "Select type of reference discovery policy: " \ 2031 "reference-based(0) or referent-based(1)") \ 2032 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2033 ReferenceProcessor::DiscoveryPolicyMax) \ 2034 \ 2035 product(bool, ParallelRefProcEnabled, false, \ 2036 "Enable parallel reference processing whenever possible") \ 2037 \ 2038 product(bool, ParallelRefProcBalancingEnabled, true, \ 2039 "Enable balancing of reference processing queues") \ 2040 \ 2041 product(uintx, CMSTriggerRatio, 80, \ 2042 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2043 "allocated before a CMS collection cycle commences") \ 2044 range(0, 100) \ 2045 \ 2046 product(uintx, CMSBootstrapOccupancy, 50, \ 2047 "Percentage CMS generation occupancy at which to " \ 2048 "initiate CMS collection for bootstrapping collection stats") \ 2049 range(0, 100) \ 2050 \ 2051 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2052 "Percentage CMS generation occupancy to start a CMS collection " \ 2053 "cycle. A negative value means that CMSTriggerRatio is used") \ 2054 range(min_intx, 100) \ 2055 \ 2056 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2057 "Percentage of the (entire) heap occupancy to start a " \ 2058 "concurrent GC cycle. It is used by GCs that trigger a " \ 2059 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2060 "not just one of the generations (e.g., G1). A value of 0 " \ 2061 "denotes 'do constant GC cycles'.") \ 2062 range(0, 100) \ 2063 \ 2064 manageable(intx, CMSTriggerInterval, -1, \ 2065 "Commence a CMS collection cycle (at least) every so many " \ 2066 "milliseconds (0 permanently, -1 disabled)") \ 2067 range(-1, max_intx) \ 2068 \ 2069 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2070 "Only use occupancy as a criterion for starting a CMS collection")\ 2071 \ 2072 product(uintx, CMSIsTooFullPercentage, 98, \ 2073 "An absolute ceiling above which CMS will always consider the " \ 2074 "unloading of classes when class unloading is enabled") \ 2075 range(0, 100) \ 2076 \ 2077 develop(bool, CMSTestInFreeList, false, \ 2078 "Check if the coalesced range is already in the " \ 2079 "free lists as claimed") \ 2080 \ 2081 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2082 "Check that all the garbage collected was returned to the " \ 2083 "free lists") \ 2084 \ 2085 notproduct(bool, ScavengeALot, false, \ 2086 "Force scavenge at every Nth exit from the runtime system " \ 2087 "(N=ScavengeALotInterval)") \ 2088 \ 2089 develop(bool, FullGCALot, false, \ 2090 "Force full gc at every Nth exit from the runtime system " \ 2091 "(N=FullGCALotInterval)") \ 2092 \ 2093 notproduct(bool, GCALotAtAllSafepoints, false, \ 2094 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2095 \ 2096 product(bool, PrintPromotionFailure, false, \ 2097 "Print additional diagnostic information following " \ 2098 "promotion failure") \ 2099 \ 2100 notproduct(bool, PromotionFailureALot, false, \ 2101 "Use promotion failure handling on every youngest generation " \ 2102 "collection") \ 2103 \ 2104 develop(uintx, PromotionFailureALotCount, 1000, \ 2105 "Number of promotion failures occurring at PLAB " \ 2106 "refill attempts (ParNew) or promotion attempts " \ 2107 "(other young collectors)") \ 2108 \ 2109 develop(uintx, PromotionFailureALotInterval, 5, \ 2110 "Total collections between promotion failures a lot") \ 2111 \ 2112 experimental(uintx, WorkStealingSleepMillis, 1, \ 2113 "Sleep time when sleep is used for yields") \ 2114 \ 2115 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2116 "Number of yields before a sleep is done during work stealing") \ 2117 \ 2118 experimental(uintx, WorkStealingHardSpins, 4096, \ 2119 "Number of iterations in a spin loop between checks on " \ 2120 "time out of hard spin") \ 2121 \ 2122 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2123 "Ratio of hard spins to calls to yield") \ 2124 \ 2125 develop(uintx, ObjArrayMarkingStride, 512, \ 2126 "Number of object array elements to push onto the marking stack " \ 2127 "before pushing a continuation entry") \ 2128 \ 2129 develop(bool, MetadataAllocationFailALot, false, \ 2130 "Fail metadata allocations at intervals controlled by " \ 2131 "MetadataAllocationFailALotInterval") \ 2132 \ 2133 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2134 "Metadata allocation failure a lot interval") \ 2135 \ 2136 develop(bool, TraceMetadataChunkAllocation, false, \ 2137 "Trace chunk metadata allocations") \ 2138 \ 2139 product(bool, TraceMetadataHumongousAllocation, false, \ 2140 "Trace humongous metadata allocations") \ 2141 \ 2142 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2143 "Trace virtual space metadata allocations") \ 2144 \ 2145 notproduct(bool, ExecuteInternalVMTests, false, \ 2146 "Enable execution of internal VM tests") \ 2147 \ 2148 notproduct(bool, VerboseInternalVMTests, false, \ 2149 "Turn on logging for internal VM tests.") \ 2150 \ 2151 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2152 \ 2153 product_pd(bool, ResizeTLAB, \ 2154 "Dynamically resize TLAB size for threads") \ 2155 \ 2156 product(bool, ZeroTLAB, false, \ 2157 "Zero out the newly created TLAB") \ 2158 \ 2159 product(bool, FastTLABRefill, true, \ 2160 "Use fast TLAB refill code") \ 2161 \ 2162 product(bool, PrintTLAB, false, \ 2163 "Print various TLAB related information") \ 2164 \ 2165 product(bool, TLABStats, true, \ 2166 "Provide more detailed and expensive TLAB statistics " \ 2167 "(with PrintTLAB)") \ 2168 \ 2169 product_pd(bool, NeverActAsServerClassMachine, \ 2170 "Never act like a server-class machine") \ 2171 \ 2172 product(bool, AlwaysActAsServerClassMachine, false, \ 2173 "Always act like a server-class machine") \ 2174 \ 2175 product_pd(uint64_t, MaxRAM, \ 2176 "Real memory size (in bytes) used to set maximum heap size") \ 2177 \ 2178 product(size_t, ErgoHeapSizeLimit, 0, \ 2179 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2180 "MaxRAM / MaxRAMFraction") \ 2181 \ 2182 product(uintx, MaxRAMFraction, 4, \ 2183 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2184 "size") \ 2185 range(1, max_uintx) \ 2186 \ 2187 product(uintx, DefaultMaxRAMFraction, 4, \ 2188 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2189 "size; deprecated: to be renamed to MaxRAMFraction") \ 2190 range(1, max_uintx) \ 2191 \ 2192 product(uintx, MinRAMFraction, 2, \ 2193 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2194 "size on systems with small physical memory size") \ 2195 range(1, max_uintx) \ 2196 \ 2197 product(uintx, InitialRAMFraction, 64, \ 2198 "Fraction (1/n) of real memory used for initial heap size") \ 2199 range(1, max_uintx) \ 2200 \ 2201 develop(uintx, MaxVirtMemFraction, 2, \ 2202 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2203 "determining maximum heap size") \ 2204 \ 2205 product(bool, UseAutoGCSelectPolicy, false, \ 2206 "Use automatic collection selection policy") \ 2207 \ 2208 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2209 "Automatic GC selection pause threshold in milliseconds") \ 2210 \ 2211 product(bool, UseAdaptiveSizePolicy, true, \ 2212 "Use adaptive generation sizing policies") \ 2213 \ 2214 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2215 "Use adaptive survivor sizing policies") \ 2216 \ 2217 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2218 "Use adaptive young-old sizing policies at minor collections") \ 2219 \ 2220 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2221 "Use adaptive young-old sizing policies at major collections") \ 2222 \ 2223 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2224 "Include statistics from System.gc() for adaptive size policy") \ 2225 \ 2226 product(bool, UseAdaptiveGCBoundary, false, \ 2227 "Allow young-old boundary to move") \ 2228 \ 2229 develop(bool, TraceAdaptiveGCBoundary, false, \ 2230 "Trace young-old boundary moves") \ 2231 \ 2232 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2233 "Resize the virtual spaces of the young or old generations") \ 2234 \ 2235 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2236 "Policy for changing generation size for throughput goals") \ 2237 \ 2238 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2239 "Adjust tenured generation to achieve a minor pause goal") \ 2240 \ 2241 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2242 "Adjust young generation to achieve a major pause goal") \ 2243 \ 2244 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2245 "Number of steps where heuristics is used before data is used") \ 2246 \ 2247 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2248 "Number of collections before the adaptive sizing is started") \ 2249 \ 2250 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2251 "Collection interval for printing information; zero means never") \ 2252 \ 2253 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2254 "Use adaptive minimum footprint as a goal") \ 2255 \ 2256 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2257 "Weight given to exponential resizing, between 0 and 100") \ 2258 range(0, 100) \ 2259 \ 2260 product(uintx, AdaptiveTimeWeight, 25, \ 2261 "Weight given to time in adaptive policy, between 0 and 100") \ 2262 range(0, 100) \ 2263 \ 2264 product(uintx, PausePadding, 1, \ 2265 "How much buffer to keep for pause time") \ 2266 \ 2267 product(uintx, PromotedPadding, 3, \ 2268 "How much buffer to keep for promotion failure") \ 2269 \ 2270 product(uintx, SurvivorPadding, 3, \ 2271 "How much buffer to keep for survivor overflow") \ 2272 \ 2273 product(uintx, ThresholdTolerance, 10, \ 2274 "Allowed collection cost difference between generations") \ 2275 range(0, 100) \ 2276 \ 2277 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2278 "If collection costs are within margin, reduce both by full " \ 2279 "delta") \ 2280 \ 2281 product(uintx, YoungGenerationSizeIncrement, 20, \ 2282 "Adaptive size percentage change in young generation") \ 2283 range(0, 100) \ 2284 \ 2285 product(uintx, YoungGenerationSizeSupplement, 80, \ 2286 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2287 range(0, 100) \ 2288 \ 2289 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2290 "Decay factor to YoungedGenerationSizeSupplement") \ 2291 range(1, max_uintx) \ 2292 \ 2293 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2294 "Adaptive size percentage change in tenured generation") \ 2295 range(0, 100) \ 2296 \ 2297 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2298 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2299 range(0, 100) \ 2300 \ 2301 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2302 "Decay factor to TenuredGenerationSizeIncrement") \ 2303 range(1, max_uintx) \ 2304 \ 2305 product(uintx, MaxGCPauseMillis, max_uintx, \ 2306 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2307 "or (G1 Only) the maximum GC time per MMU time slice") \ 2308 \ 2309 product(uintx, GCPauseIntervalMillis, 0, \ 2310 "Time slice for MMU specification") \ 2311 \ 2312 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2313 "Adaptive size policy maximum GC minor pause time goal " \ 2314 "in millisecond") \ 2315 \ 2316 product(uintx, GCTimeRatio, 99, \ 2317 "Adaptive size policy application time to GC time ratio") \ 2318 \ 2319 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2320 "Adaptive size scale down factor for shrinking") \ 2321 range(1, max_uintx) \ 2322 \ 2323 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2324 "Adaptive size decays the major cost for long major intervals") \ 2325 \ 2326 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2327 "Time scale over which major costs decay") \ 2328 \ 2329 product(uintx, MinSurvivorRatio, 3, \ 2330 "Minimum ratio of young generation/survivor space size") \ 2331 \ 2332 product(uintx, InitialSurvivorRatio, 8, \ 2333 "Initial ratio of young generation/survivor space size") \ 2334 \ 2335 product(size_t, BaseFootPrintEstimate, 256*M, \ 2336 "Estimate of footprint other than Java Heap") \ 2337 \ 2338 product(bool, UseGCOverheadLimit, true, \ 2339 "Use policy to limit of proportion of time spent in GC " \ 2340 "before an OutOfMemory error is thrown") \ 2341 \ 2342 product(uintx, GCTimeLimit, 98, \ 2343 "Limit of the proportion of time spent in GC before " \ 2344 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2345 range(0, 100) \ 2346 \ 2347 product(uintx, GCHeapFreeLimit, 2, \ 2348 "Minimum percentage of free space after a full GC before an " \ 2349 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2350 range(0, 100) \ 2351 \ 2352 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2353 "Number of consecutive collections before gc time limit fires") \ 2354 \ 2355 product(bool, PrintAdaptiveSizePolicy, false, \ 2356 "Print information about AdaptiveSizePolicy") \ 2357 \ 2358 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2359 "How far ahead to prefetch destination area (<= 0 means off)") \ 2360 \ 2361 product(intx, PrefetchScanIntervalInBytes, -1, \ 2362 "How far ahead to prefetch scan area (<= 0 means off)") \ 2363 \ 2364 product(intx, PrefetchFieldsAhead, -1, \ 2365 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2366 \ 2367 diagnostic(bool, VerifySilently, false, \ 2368 "Do not print the verification progress") \ 2369 \ 2370 diagnostic(bool, VerifyDuringStartup, false, \ 2371 "Verify memory system before executing any Java code " \ 2372 "during VM initialization") \ 2373 \ 2374 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2375 "Verify system before exiting") \ 2376 \ 2377 diagnostic(bool, VerifyBeforeGC, false, \ 2378 "Verify memory system before GC") \ 2379 \ 2380 diagnostic(bool, VerifyAfterGC, false, \ 2381 "Verify memory system after GC") \ 2382 \ 2383 diagnostic(bool, VerifyDuringGC, false, \ 2384 "Verify memory system during GC (between phases)") \ 2385 \ 2386 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2387 "Enable parallel memory system verification") \ 2388 \ 2389 diagnostic(bool, DeferInitialCardMark, false, \ 2390 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2391 "may arise from new_pre_store_barrier") \ 2392 \ 2393 product(bool, UseCondCardMark, false, \ 2394 "Check for already marked card before updating card table") \ 2395 \ 2396 diagnostic(bool, VerifyRememberedSets, false, \ 2397 "Verify GC remembered sets") \ 2398 \ 2399 diagnostic(bool, VerifyObjectStartArray, true, \ 2400 "Verify GC object start array if verify before/after") \ 2401 \ 2402 product(bool, DisableExplicitGC, false, \ 2403 "Ignore calls to System.gc()") \ 2404 \ 2405 notproduct(bool, CheckMemoryInitialization, false, \ 2406 "Check memory initialization") \ 2407 \ 2408 diagnostic(bool, BindCMSThreadToCPU, false, \ 2409 "Bind CMS Thread to CPU if possible") \ 2410 \ 2411 diagnostic(uintx, CPUForCMSThread, 0, \ 2412 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2413 \ 2414 product(bool, BindGCTaskThreadsToCPUs, false, \ 2415 "Bind GCTaskThreads to CPUs if possible") \ 2416 \ 2417 product(bool, UseGCTaskAffinity, false, \ 2418 "Use worker affinity when asking for GCTasks") \ 2419 \ 2420 product(uintx, ProcessDistributionStride, 4, \ 2421 "Stride through processors when distributing processes") \ 2422 \ 2423 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2424 "Number of times the coordinator GC thread will sleep while " \ 2425 "yielding before giving up and resuming GC") \ 2426 \ 2427 product(uintx, CMSYieldSleepCount, 0, \ 2428 "Number of times a GC thread (minus the coordinator) " \ 2429 "will sleep while yielding before giving up and resuming GC") \ 2430 \ 2431 /* gc tracing */ \ 2432 manageable(bool, PrintGC, false, \ 2433 "Print message at garbage collection") \ 2434 \ 2435 manageable(bool, PrintGCDetails, false, \ 2436 "Print more details at garbage collection") \ 2437 \ 2438 manageable(bool, PrintGCDateStamps, false, \ 2439 "Print date stamps at garbage collection") \ 2440 \ 2441 manageable(bool, PrintGCTimeStamps, false, \ 2442 "Print timestamps at garbage collection") \ 2443 \ 2444 manageable(bool, PrintGCID, true, \ 2445 "Print an identifier for each garbage collection") \ 2446 \ 2447 product(bool, PrintGCTaskTimeStamps, false, \ 2448 "Print timestamps for individual gc worker thread tasks") \ 2449 \ 2450 develop(intx, ConcGCYieldTimeout, 0, \ 2451 "If non-zero, assert that GC threads yield within this " \ 2452 "number of milliseconds") \ 2453 \ 2454 product(bool, PrintReferenceGC, false, \ 2455 "Print times spent handling reference objects during GC " \ 2456 "(enabled only when PrintGCDetails)") \ 2457 \ 2458 develop(bool, TraceReferenceGC, false, \ 2459 "Trace handling of soft/weak/final/phantom references") \ 2460 \ 2461 develop(bool, TraceFinalizerRegistration, false, \ 2462 "Trace registration of final references") \ 2463 \ 2464 notproduct(bool, TraceScavenge, false, \ 2465 "Trace scavenge") \ 2466 \ 2467 product(bool, IgnoreEmptyClassPaths, false, \ 2468 "Ignore empty path elements in -classpath") \ 2469 \ 2470 product(bool, TraceClassPaths, false, \ 2471 "Trace processing of class paths") \ 2472 \ 2473 product_rw(bool, TraceClassLoading, false, \ 2474 "Trace all classes loaded") \ 2475 \ 2476 product(bool, TraceClassLoadingPreorder, false, \ 2477 "Trace all classes loaded in order referenced (not loaded)") \ 2478 \ 2479 product_rw(bool, TraceClassUnloading, false, \ 2480 "Trace unloading of classes") \ 2481 \ 2482 product_rw(bool, TraceLoaderConstraints, false, \ 2483 "Trace loader constraints") \ 2484 \ 2485 develop(bool, TraceClassLoaderData, false, \ 2486 "Trace class loader loader_data lifetime") \ 2487 \ 2488 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2489 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2490 "Initial size of the boot class loader data metaspace") \ 2491 \ 2492 product(bool, TraceYoungGenTime, false, \ 2493 "Trace accumulated time for young collection") \ 2494 \ 2495 product(bool, TraceOldGenTime, false, \ 2496 "Trace accumulated time for old collection") \ 2497 \ 2498 product(bool, PrintTenuringDistribution, false, \ 2499 "Print tenuring age information") \ 2500 \ 2501 product_rw(bool, PrintHeapAtGC, false, \ 2502 "Print heap layout before and after each GC") \ 2503 \ 2504 product_rw(bool, PrintHeapAtGCExtended, false, \ 2505 "Print extended information about the layout of the heap " \ 2506 "when -XX:+PrintHeapAtGC is set") \ 2507 \ 2508 product(bool, PrintHeapAtSIGBREAK, true, \ 2509 "Print heap layout in response to SIGBREAK") \ 2510 \ 2511 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2512 "Print a class histogram before any major stop-world GC") \ 2513 \ 2514 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2515 "Print a class histogram after any major stop-world GC") \ 2516 \ 2517 manageable(bool, PrintClassHistogram, false, \ 2518 "Print a histogram of class instances") \ 2519 \ 2520 develop(bool, TraceWorkGang, false, \ 2521 "Trace activities of work gangs") \ 2522 \ 2523 product(bool, TraceParallelOldGCTasks, false, \ 2524 "Trace multithreaded GC activity") \ 2525 \ 2526 develop(bool, TraceBlockOffsetTable, false, \ 2527 "Print BlockOffsetTable maps") \ 2528 \ 2529 develop(bool, TraceCardTableModRefBS, false, \ 2530 "Print CardTableModRefBS maps") \ 2531 \ 2532 develop(bool, TraceGCTaskManager, false, \ 2533 "Trace actions of the GC task manager") \ 2534 \ 2535 develop(bool, TraceGCTaskQueue, false, \ 2536 "Trace actions of the GC task queues") \ 2537 \ 2538 diagnostic(bool, TraceGCTaskThread, false, \ 2539 "Trace actions of the GC task threads") \ 2540 \ 2541 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2542 "Print the time taken by each phase in ParallelOldGC " \ 2543 "(PrintGCDetails must also be enabled)") \ 2544 \ 2545 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2546 "Trace marking phase in ParallelOldGC") \ 2547 \ 2548 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2549 "Trace summary phase in ParallelOldGC") \ 2550 \ 2551 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2552 "Trace compaction phase in ParallelOldGC") \ 2553 \ 2554 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2555 "Trace dense prefix computation for ParallelOldGC") \ 2556 \ 2557 develop(bool, IgnoreLibthreadGPFault, false, \ 2558 "Suppress workaround for libthread GP fault") \ 2559 \ 2560 product(bool, PrintJNIGCStalls, false, \ 2561 "Print diagnostic message when GC is stalled " \ 2562 "by JNI critical section") \ 2563 \ 2564 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2565 "The percentage of the used heap that the instances of a class " \ 2566 "must occupy for the class to generate a trace event") \ 2567 \ 2568 /* GC log rotation setting */ \ 2569 \ 2570 product(bool, UseGCLogFileRotation, false, \ 2571 "Rotate gclog files (for long running applications). It requires "\ 2572 "-Xloggc:<filename>") \ 2573 \ 2574 product(uintx, NumberOfGCLogFiles, 0, \ 2575 "Number of gclog files in rotation " \ 2576 "(default: 0, no rotation)") \ 2577 \ 2578 product(size_t, GCLogFileSize, 8*K, \ 2579 "GC log file size, requires UseGCLogFileRotation. " \ 2580 "Set to 0 to only trigger rotation via jcmd") \ 2581 \ 2582 /* JVMTI heap profiling */ \ 2583 \ 2584 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2585 "Trace JVMTI object tagging calls") \ 2586 \ 2587 diagnostic(bool, VerifyBeforeIteration, false, \ 2588 "Verify memory system before JVMTI iteration") \ 2589 \ 2590 /* compiler interface */ \ 2591 \ 2592 develop(bool, CIPrintCompilerName, false, \ 2593 "when CIPrint is active, print the name of the active compiler") \ 2594 \ 2595 diagnostic(bool, CIPrintCompileQueue, false, \ 2596 "display the contents of the compile queue whenever a " \ 2597 "compilation is enqueued") \ 2598 \ 2599 develop(bool, CIPrintRequests, false, \ 2600 "display every request for compilation") \ 2601 \ 2602 product(bool, CITime, false, \ 2603 "collect timing information for compilation") \ 2604 \ 2605 develop(bool, CITimeVerbose, false, \ 2606 "be more verbose in compilation timings") \ 2607 \ 2608 develop(bool, CITimeEach, false, \ 2609 "display timing information after each successful compilation") \ 2610 \ 2611 develop(bool, CICountOSR, false, \ 2612 "use a separate counter when assigning ids to osr compilations") \ 2613 \ 2614 develop(bool, CICompileNatives, true, \ 2615 "compile native methods if supported by the compiler") \ 2616 \ 2617 develop_pd(bool, CICompileOSR, \ 2618 "compile on stack replacement methods if supported by the " \ 2619 "compiler") \ 2620 \ 2621 develop(bool, CIPrintMethodCodes, false, \ 2622 "print method bytecodes of the compiled code") \ 2623 \ 2624 develop(bool, CIPrintTypeFlow, false, \ 2625 "print the results of ciTypeFlow analysis") \ 2626 \ 2627 develop(bool, CITraceTypeFlow, false, \ 2628 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2629 \ 2630 develop(intx, OSROnlyBCI, -1, \ 2631 "OSR only at this bci. Negative values mean exclude that bci") \ 2632 \ 2633 /* compiler */ \ 2634 \ 2635 /* notice: the max range value here is max_jint, not max_intx */ \ 2636 /* because of overflow issue */ \ 2637 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2638 "Number of compiler threads to run") \ 2639 range((intx)Arguments::get_min_number_of_compiler_threads(), \ 2640 max_jint) \ 2641 \ 2642 product(intx, CompilationPolicyChoice, 0, \ 2643 "which compilation policy (0-3)") \ 2644 range(0, 3) \ 2645 \ 2646 develop(bool, UseStackBanging, true, \ 2647 "use stack banging for stack overflow checks (required for " \ 2648 "proper StackOverflow handling; disable only to measure cost " \ 2649 "of stackbanging)") \ 2650 \ 2651 develop(bool, UseStrictFP, true, \ 2652 "use strict fp if modifier strictfp is set") \ 2653 \ 2654 develop(bool, GenerateSynchronizationCode, true, \ 2655 "generate locking/unlocking code for synchronized methods and " \ 2656 "monitors") \ 2657 \ 2658 develop(bool, GenerateCompilerNullChecks, true, \ 2659 "Generate explicit null checks for loads/stores/calls") \ 2660 \ 2661 develop(bool, GenerateRangeChecks, true, \ 2662 "Generate range checks for array accesses") \ 2663 \ 2664 develop_pd(bool, ImplicitNullChecks, \ 2665 "Generate code for implicit null checks") \ 2666 \ 2667 product_pd(bool, TrapBasedNullChecks, \ 2668 "Generate code for null checks that uses a cmp and trap " \ 2669 "instruction raising SIGTRAP. This is only used if an access to" \ 2670 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2671 "ImplicitNullChecks don't work (PPC64).") \ 2672 \ 2673 product(bool, PrintSafepointStatistics, false, \ 2674 "Print statistics about safepoint synchronization") \ 2675 \ 2676 product(intx, PrintSafepointStatisticsCount, 300, \ 2677 "Total number of safepoint statistics collected " \ 2678 "before printing them out") \ 2679 \ 2680 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2681 "Print safepoint statistics only when safepoint takes " \ 2682 "more than PrintSafepointSatisticsTimeout in millis") \ 2683 \ 2684 product(bool, TraceSafepointCleanupTime, false, \ 2685 "Print the break down of clean up tasks performed during " \ 2686 "safepoint") \ 2687 \ 2688 product(bool, Inline, true, \ 2689 "Enable inlining") \ 2690 \ 2691 product(bool, ClipInlining, true, \ 2692 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2693 \ 2694 develop(bool, UseCHA, true, \ 2695 "Enable CHA") \ 2696 \ 2697 product(bool, UseTypeProfile, true, \ 2698 "Check interpreter profile for historically monomorphic calls") \ 2699 \ 2700 diagnostic(bool, PrintInlining, false, \ 2701 "Print inlining optimizations") \ 2702 \ 2703 product(bool, UsePopCountInstruction, false, \ 2704 "Use population count instruction") \ 2705 \ 2706 develop(bool, EagerInitialization, false, \ 2707 "Eagerly initialize classes if possible") \ 2708 \ 2709 develop(bool, TraceMethodReplacement, false, \ 2710 "Print when methods are replaced do to recompilation") \ 2711 \ 2712 develop(bool, PrintMethodFlushing, false, \ 2713 "Print the nmethods being flushed") \ 2714 \ 2715 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2716 "print statistics about method flushing") \ 2717 \ 2718 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2719 "Number of compiled code invocations after which " \ 2720 "the method is considered as hot by the flusher") \ 2721 \ 2722 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2723 "Minimum number of sweeper passes before an nmethod " \ 2724 "can be flushed") \ 2725 \ 2726 product(bool, UseCodeAging, true, \ 2727 "Insert counter to detect warm methods") \ 2728 \ 2729 diagnostic(bool, StressCodeAging, false, \ 2730 "Start with counters compiled in") \ 2731 \ 2732 develop(bool, UseRelocIndex, false, \ 2733 "Use an index to speed random access to relocations") \ 2734 \ 2735 develop(bool, StressCodeBuffers, false, \ 2736 "Exercise code buffer expansion and other rare state changes") \ 2737 \ 2738 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2739 "Generate extra debugging information for non-safepoints in " \ 2740 "nmethods") \ 2741 \ 2742 product(bool, PrintVMOptions, false, \ 2743 "Print flags that appeared on the command line") \ 2744 \ 2745 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2746 "Ignore unrecognized VM options") \ 2747 \ 2748 product(bool, PrintCommandLineFlags, false, \ 2749 "Print flags specified on command line or set by ergonomics") \ 2750 \ 2751 product(bool, PrintFlagsInitial, false, \ 2752 "Print all VM flags before argument processing and exit VM") \ 2753 \ 2754 product(bool, PrintFlagsFinal, false, \ 2755 "Print all VM flags after argument and ergonomic processing") \ 2756 \ 2757 notproduct(bool, PrintFlagsWithComments, false, \ 2758 "Print all VM flags with default values and descriptions and " \ 2759 "exit") \ 2760 \ 2761 product(bool, PrintFlagsRanges, false, \ 2762 "Print VM flags and their ranges and exit VM") \ 2763 \ 2764 diagnostic(bool, SerializeVMOutput, true, \ 2765 "Use a mutex to serialize output to tty and LogFile") \ 2766 \ 2767 diagnostic(bool, DisplayVMOutput, true, \ 2768 "Display all VM output on the tty, independently of LogVMOutput") \ 2769 \ 2770 diagnostic(bool, LogVMOutput, false, \ 2771 "Save VM output to LogFile") \ 2772 \ 2773 diagnostic(ccstr, LogFile, NULL, \ 2774 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2775 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2776 \ 2777 product(ccstr, ErrorFile, NULL, \ 2778 "If an error occurs, save the error data to this file " \ 2779 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2780 \ 2781 product(bool, DisplayVMOutputToStderr, false, \ 2782 "If DisplayVMOutput is true, display all VM output to stderr") \ 2783 \ 2784 product(bool, DisplayVMOutputToStdout, false, \ 2785 "If DisplayVMOutput is true, display all VM output to stdout") \ 2786 \ 2787 product(bool, UseHeavyMonitors, false, \ 2788 "use heavyweight instead of lightweight Java monitors") \ 2789 \ 2790 product(bool, PrintStringTableStatistics, false, \ 2791 "print statistics about the StringTable and SymbolTable") \ 2792 \ 2793 diagnostic(bool, VerifyStringTableAtExit, false, \ 2794 "verify StringTable contents at exit") \ 2795 \ 2796 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2797 "print histogram of the symbol table") \ 2798 \ 2799 notproduct(bool, ExitVMOnVerifyError, false, \ 2800 "standard exit from VM if bytecode verify error " \ 2801 "(only in debug mode)") \ 2802 \ 2803 notproduct(ccstr, AbortVMOnException, NULL, \ 2804 "Call fatal if this exception is thrown. Example: " \ 2805 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2806 \ 2807 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2808 "Call fatal if the exception pointed by AbortVMOnException " \ 2809 "has this message") \ 2810 \ 2811 develop(bool, DebugVtables, false, \ 2812 "add debugging code to vtable dispatch") \ 2813 \ 2814 develop(bool, PrintVtables, false, \ 2815 "print vtables when printing klass") \ 2816 \ 2817 notproduct(bool, PrintVtableStats, false, \ 2818 "print vtables stats at end of run") \ 2819 \ 2820 develop(bool, TraceCreateZombies, false, \ 2821 "trace creation of zombie nmethods") \ 2822 \ 2823 notproduct(bool, IgnoreLockingAssertions, false, \ 2824 "disable locking assertions (for speed)") \ 2825 \ 2826 product(bool, RangeCheckElimination, true, \ 2827 "Eliminate range checks") \ 2828 \ 2829 develop_pd(bool, UncommonNullCast, \ 2830 "track occurrences of null in casts; adjust compiler tactics") \ 2831 \ 2832 develop(bool, TypeProfileCasts, true, \ 2833 "treat casts like calls for purposes of type profiling") \ 2834 \ 2835 develop(bool, DelayCompilationDuringStartup, true, \ 2836 "Delay invoking the compiler until main application class is " \ 2837 "loaded") \ 2838 \ 2839 develop(bool, CompileTheWorld, false, \ 2840 "Compile all methods in all classes in bootstrap class path " \ 2841 "(stress test)") \ 2842 \ 2843 develop(bool, CompileTheWorldPreloadClasses, true, \ 2844 "Preload all classes used by a class before start loading") \ 2845 \ 2846 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2847 "Force a safepoint every n compiles so sweeper can keep up") \ 2848 \ 2849 develop(bool, FillDelaySlots, true, \ 2850 "Fill delay slots (on SPARC only)") \ 2851 \ 2852 develop(bool, TimeLivenessAnalysis, false, \ 2853 "Time computation of bytecode liveness analysis") \ 2854 \ 2855 develop(bool, TraceLivenessGen, false, \ 2856 "Trace the generation of liveness analysis information") \ 2857 \ 2858 notproduct(bool, TraceLivenessQuery, false, \ 2859 "Trace queries of liveness analysis information") \ 2860 \ 2861 notproduct(bool, CollectIndexSetStatistics, false, \ 2862 "Collect information about IndexSets") \ 2863 \ 2864 develop(bool, UseLoopSafepoints, true, \ 2865 "Generate Safepoint nodes in every loop") \ 2866 \ 2867 develop(intx, FastAllocateSizeLimit, 128*K, \ 2868 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2869 "Inline allocations larger than this in doublewords must go slow")\ 2870 \ 2871 product(bool, AggressiveOpts, false, \ 2872 "Enable aggressive optimizations - see arguments.cpp") \ 2873 \ 2874 product_pd(uintx, TypeProfileLevel, \ 2875 "=XYZ, with Z: Type profiling of arguments at call; " \ 2876 "Y: Type profiling of return value at call; " \ 2877 "X: Type profiling of parameters to methods; " \ 2878 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2879 \ 2880 product(intx, TypeProfileArgsLimit, 2, \ 2881 "max number of call arguments to consider for type profiling") \ 2882 \ 2883 product(intx, TypeProfileParmsLimit, 2, \ 2884 "max number of incoming parameters to consider for type profiling"\ 2885 ", -1 for all") \ 2886 \ 2887 /* statistics */ \ 2888 develop(bool, CountCompiledCalls, false, \ 2889 "Count method invocations") \ 2890 \ 2891 notproduct(bool, CountRuntimeCalls, false, \ 2892 "Count VM runtime calls") \ 2893 \ 2894 develop(bool, CountJNICalls, false, \ 2895 "Count jni method invocations") \ 2896 \ 2897 notproduct(bool, CountJVMCalls, false, \ 2898 "Count jvm method invocations") \ 2899 \ 2900 notproduct(bool, CountRemovableExceptions, false, \ 2901 "Count exceptions that could be replaced by branches due to " \ 2902 "inlining") \ 2903 \ 2904 notproduct(bool, ICMissHistogram, false, \ 2905 "Produce histogram of IC misses") \ 2906 \ 2907 notproduct(bool, PrintClassStatistics, false, \ 2908 "Print class statistics at end of run") \ 2909 \ 2910 notproduct(bool, PrintMethodStatistics, false, \ 2911 "Print method statistics at end of run") \ 2912 \ 2913 /* interpreter */ \ 2914 develop(bool, ClearInterpreterLocals, false, \ 2915 "Always clear local variables of interpreter activations upon " \ 2916 "entry") \ 2917 \ 2918 product_pd(bool, RewriteBytecodes, \ 2919 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2920 \ 2921 product_pd(bool, RewriteFrequentPairs, \ 2922 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2923 \ 2924 diagnostic(bool, PrintInterpreter, false, \ 2925 "Print the generated interpreter code") \ 2926 \ 2927 product(bool, UseInterpreter, true, \ 2928 "Use interpreter for non-compiled methods") \ 2929 \ 2930 develop(bool, UseFastSignatureHandlers, true, \ 2931 "Use fast signature handlers for native calls") \ 2932 \ 2933 product(bool, UseLoopCounter, true, \ 2934 "Increment invocation counter on backward branch") \ 2935 \ 2936 product_pd(bool, UseOnStackReplacement, \ 2937 "Use on stack replacement, calls runtime if invoc. counter " \ 2938 "overflows in loop") \ 2939 \ 2940 notproduct(bool, TraceOnStackReplacement, false, \ 2941 "Trace on stack replacement") \ 2942 \ 2943 product_pd(bool, PreferInterpreterNativeStubs, \ 2944 "Use always interpreter stubs for native methods invoked via " \ 2945 "interpreter") \ 2946 \ 2947 develop(bool, CountBytecodes, false, \ 2948 "Count number of bytecodes executed") \ 2949 \ 2950 develop(bool, PrintBytecodeHistogram, false, \ 2951 "Print histogram of the executed bytecodes") \ 2952 \ 2953 develop(bool, PrintBytecodePairHistogram, false, \ 2954 "Print histogram of the executed bytecode pairs") \ 2955 \ 2956 diagnostic(bool, PrintSignatureHandlers, false, \ 2957 "Print code generated for native method signature handlers") \ 2958 \ 2959 develop(bool, VerifyOops, false, \ 2960 "Do plausibility checks for oops") \ 2961 \ 2962 develop(bool, CheckUnhandledOops, false, \ 2963 "Check for unhandled oops in VM code") \ 2964 \ 2965 develop(bool, VerifyJNIFields, trueInDebug, \ 2966 "Verify jfieldIDs for instance fields") \ 2967 \ 2968 notproduct(bool, VerifyJNIEnvThread, false, \ 2969 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2970 "from JNI") \ 2971 \ 2972 develop(bool, VerifyFPU, false, \ 2973 "Verify FPU state (check for NaN's, etc.)") \ 2974 \ 2975 develop(bool, VerifyThread, false, \ 2976 "Watch the thread register for corruption (SPARC only)") \ 2977 \ 2978 develop(bool, VerifyActivationFrameSize, false, \ 2979 "Verify that activation frame didn't become smaller than its " \ 2980 "minimal size") \ 2981 \ 2982 develop(bool, TraceFrequencyInlining, false, \ 2983 "Trace frequency based inlining") \ 2984 \ 2985 develop_pd(bool, InlineIntrinsics, \ 2986 "Inline intrinsics that can be statically resolved") \ 2987 \ 2988 product_pd(bool, ProfileInterpreter, \ 2989 "Profile at the bytecode level during interpretation") \ 2990 \ 2991 develop(bool, TraceProfileInterpreter, false, \ 2992 "Trace profiling at the bytecode level during interpretation. " \ 2993 "This outputs the profiling information collected to improve " \ 2994 "jit compilation.") \ 2995 \ 2996 develop_pd(bool, ProfileTraps, \ 2997 "Profile deoptimization traps at the bytecode level") \ 2998 \ 2999 product(intx, ProfileMaturityPercentage, 20, \ 3000 "number of method invocations/branches (expressed as % of " \ 3001 "CompileThreshold) before using the method's profile") \ 3002 range(0, 100) \ 3003 \ 3004 diagnostic(bool, PrintMethodData, false, \ 3005 "Print the results of +ProfileInterpreter at end of run") \ 3006 \ 3007 develop(bool, VerifyDataPointer, trueInDebug, \ 3008 "Verify the method data pointer during interpreter profiling") \ 3009 \ 3010 develop(bool, VerifyCompiledCode, false, \ 3011 "Include miscellaneous runtime verifications in nmethod code; " \ 3012 "default off because it disturbs nmethod size heuristics") \ 3013 \ 3014 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 3015 "Manually make GC thread crash then dump java stack trace; " \ 3016 "Test only") \ 3017 \ 3018 /* compilation */ \ 3019 product(bool, UseCompiler, true, \ 3020 "Use Just-In-Time compilation") \ 3021 \ 3022 develop(bool, TraceCompilationPolicy, false, \ 3023 "Trace compilation policy") \ 3024 \ 3025 develop(bool, TimeCompilationPolicy, false, \ 3026 "Time the compilation policy") \ 3027 \ 3028 product(bool, UseCounterDecay, true, \ 3029 "Adjust recompilation counters") \ 3030 \ 3031 develop(intx, CounterHalfLifeTime, 30, \ 3032 "Half-life time of invocation counters (in seconds)") \ 3033 \ 3034 develop(intx, CounterDecayMinIntervalLength, 500, \ 3035 "The minimum interval (in milliseconds) between invocation of " \ 3036 "CounterDecay") \ 3037 \ 3038 product(bool, AlwaysCompileLoopMethods, false, \ 3039 "When using recompilation, never interpret methods " \ 3040 "containing loops") \ 3041 \ 3042 product(bool, DontCompileHugeMethods, true, \ 3043 "Do not compile methods > HugeMethodLimit") \ 3044 \ 3045 /* Bytecode escape analysis estimation. */ \ 3046 product(bool, EstimateArgEscape, true, \ 3047 "Analyze bytecodes to estimate escape state of arguments") \ 3048 \ 3049 product(intx, BCEATraceLevel, 0, \ 3050 "How much tracing to do of bytecode escape analysis estimates") \ 3051 \ 3052 product(intx, MaxBCEAEstimateLevel, 5, \ 3053 "Maximum number of nested calls that are analyzed by BC EA") \ 3054 \ 3055 product(intx, MaxBCEAEstimateSize, 150, \ 3056 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3057 \ 3058 product(intx, AllocatePrefetchStyle, 1, \ 3059 "0 = no prefetch, " \ 3060 "1 = prefetch instructions for each allocation, " \ 3061 "2 = use TLAB watermark to gate allocation prefetch, " \ 3062 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3063 range(0, 3) \ 3064 \ 3065 product(intx, AllocatePrefetchDistance, -1, \ 3066 "Distance to prefetch ahead of allocation pointer") \ 3067 \ 3068 product(intx, AllocatePrefetchLines, 3, \ 3069 "Number of lines to prefetch ahead of array allocation pointer") \ 3070 \ 3071 product(intx, AllocateInstancePrefetchLines, 1, \ 3072 "Number of lines to prefetch ahead of instance allocation " \ 3073 "pointer") \ 3074 \ 3075 product(intx, AllocatePrefetchStepSize, 16, \ 3076 "Step size in bytes of sequential prefetch instructions") \ 3077 \ 3078 product(intx, AllocatePrefetchInstr, 0, \ 3079 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3080 \ 3081 /* deoptimization */ \ 3082 develop(bool, TraceDeoptimization, false, \ 3083 "Trace deoptimization") \ 3084 \ 3085 develop(bool, DebugDeoptimization, false, \ 3086 "Tracing various information while debugging deoptimization") \ 3087 \ 3088 product(intx, SelfDestructTimer, 0, \ 3089 "Will cause VM to terminate after a given time (in minutes) " \ 3090 "(0 means off)") \ 3091 \ 3092 product(intx, MaxJavaStackTraceDepth, 1024, \ 3093 "The maximum number of lines in the stack trace for Java " \ 3094 "exceptions (0 means all)") \ 3095 \ 3096 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3097 "Guarantee a safepoint (at least) every so many milliseconds " \ 3098 "(0 means none)")) \ 3099 \ 3100 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3101 "Guarantee a safepoint (at least) every so many milliseconds " \ 3102 "(0 means none)")) \ 3103 \ 3104 product(intx, SafepointTimeoutDelay, 10000, \ 3105 "Delay in milliseconds for option SafepointTimeout") \ 3106 \ 3107 product(intx, NmethodSweepActivity, 10, \ 3108 "Removes cold nmethods from code cache if > 0. Higher values " \ 3109 "result in more aggressive sweeping") \ 3110 range(0, 2000) \ 3111 \ 3112 notproduct(bool, LogSweeper, false, \ 3113 "Keep a ring buffer of sweeper activity") \ 3114 \ 3115 notproduct(intx, SweeperLogEntries, 1024, \ 3116 "Number of records in the ring buffer of sweeper activity") \ 3117 \ 3118 notproduct(intx, MemProfilingInterval, 500, \ 3119 "Time between each invocation of the MemProfiler") \ 3120 \ 3121 develop(intx, MallocCatchPtr, -1, \ 3122 "Hit breakpoint when mallocing/freeing this pointer") \ 3123 \ 3124 notproduct(ccstrlist, SuppressErrorAt, "", \ 3125 "List of assertions (file:line) to muzzle") \ 3126 \ 3127 notproduct(size_t, HandleAllocationLimit, 1024, \ 3128 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3129 "is used") \ 3130 \ 3131 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3132 "Threshold for total handle allocation when " \ 3133 "+TraceHandleAllocation is used") \ 3134 \ 3135 develop(intx, StackPrintLimit, 100, \ 3136 "number of stack frames to print in VM-level stack dump") \ 3137 \ 3138 notproduct(intx, MaxElementPrintSize, 256, \ 3139 "maximum number of elements to print") \ 3140 \ 3141 notproduct(intx, MaxSubklassPrintSize, 4, \ 3142 "maximum number of subklasses to print when printing klass") \ 3143 \ 3144 product(intx, MaxInlineLevel, 9, \ 3145 "maximum number of nested calls that are inlined") \ 3146 \ 3147 product(intx, MaxRecursiveInlineLevel, 1, \ 3148 "maximum number of nested recursive calls that are inlined") \ 3149 \ 3150 develop(intx, MaxForceInlineLevel, 100, \ 3151 "maximum number of nested calls that are forced for inlining " \ 3152 "(using CompilerOracle or marked w/ @ForceInline)") \ 3153 \ 3154 product_pd(intx, InlineSmallCode, \ 3155 "Only inline already compiled methods if their code size is " \ 3156 "less than this") \ 3157 \ 3158 product(intx, MaxInlineSize, 35, \ 3159 "The maximum bytecode size of a method to be inlined") \ 3160 \ 3161 product_pd(intx, FreqInlineSize, \ 3162 "The maximum bytecode size of a frequent method to be inlined") \ 3163 \ 3164 product(intx, MaxTrivialSize, 6, \ 3165 "The maximum bytecode size of a trivial method to be inlined") \ 3166 \ 3167 product(intx, MinInliningThreshold, 250, \ 3168 "The minimum invocation count a method needs to have to be " \ 3169 "inlined") \ 3170 \ 3171 develop(intx, MethodHistogramCutoff, 100, \ 3172 "The cutoff value for method invocation histogram (+CountCalls)") \ 3173 \ 3174 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3175 "Number of interpreted methods to show in profile") \ 3176 \ 3177 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3178 "Number of compiled methods to show in profile") \ 3179 \ 3180 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3181 "Number of stub methods to show in profile") \ 3182 \ 3183 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3184 "Number of runtime stub nodes to show in profile") \ 3185 \ 3186 product(intx, ProfileIntervalsTicks, 100, \ 3187 "Number of ticks between printing of interval profile " \ 3188 "(+ProfileIntervals)") \ 3189 \ 3190 notproduct(intx, ScavengeALotInterval, 1, \ 3191 "Interval between which scavenge will occur with +ScavengeALot") \ 3192 \ 3193 notproduct(intx, FullGCALotInterval, 1, \ 3194 "Interval between which full gc will occur with +FullGCALot") \ 3195 \ 3196 notproduct(intx, FullGCALotStart, 0, \ 3197 "For which invocation to start FullGCAlot") \ 3198 \ 3199 notproduct(intx, FullGCALotDummies, 32*K, \ 3200 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3201 "to move") \ 3202 \ 3203 develop(intx, DontYieldALotInterval, 10, \ 3204 "Interval between which yields will be dropped (milliseconds)") \ 3205 \ 3206 develop(intx, MinSleepInterval, 1, \ 3207 "Minimum sleep() interval (milliseconds) when " \ 3208 "ConvertSleepToYield is off (used for Solaris)") \ 3209 \ 3210 develop(intx, ProfilerPCTickThreshold, 15, \ 3211 "Number of ticks in a PC buckets to be a hotspot") \ 3212 \ 3213 notproduct(intx, DeoptimizeALotInterval, 5, \ 3214 "Number of exits until DeoptimizeALot kicks in") \ 3215 \ 3216 notproduct(intx, ZombieALotInterval, 5, \ 3217 "Number of exits until ZombieALot kicks in") \ 3218 \ 3219 diagnostic(intx, MallocVerifyInterval, 0, \ 3220 "If non-zero, verify C heap after every N calls to " \ 3221 "malloc/realloc/free") \ 3222 \ 3223 diagnostic(intx, MallocVerifyStart, 0, \ 3224 "If non-zero, start verifying C heap after Nth call to " \ 3225 "malloc/realloc/free") \ 3226 \ 3227 diagnostic(uintx, MallocMaxTestWords, 0, \ 3228 "If non-zero, maximum number of words that malloc/realloc can " \ 3229 "allocate (for testing only)") \ 3230 \ 3231 product(intx, TypeProfileWidth, 2, \ 3232 "Number of receiver types to record in call/cast profile") \ 3233 \ 3234 develop(intx, BciProfileWidth, 2, \ 3235 "Number of return bci's to record in ret profile") \ 3236 \ 3237 product(intx, PerMethodRecompilationCutoff, 400, \ 3238 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3239 range(-1, max_intx) \ 3240 \ 3241 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3242 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3243 range(-1, max_intx) \ 3244 \ 3245 product(intx, PerMethodTrapLimit, 100, \ 3246 "Limit on traps (of one kind) in a method (includes inlines)") \ 3247 \ 3248 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3249 "Limit on speculative traps (of one kind) in a method " \ 3250 "(includes inlines)") \ 3251 \ 3252 product(intx, PerBytecodeTrapLimit, 4, \ 3253 "Limit on traps (of one kind) at a particular BCI") \ 3254 \ 3255 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3256 "Extra method data trap entries for speculation") \ 3257 \ 3258 develop(intx, InlineFrequencyRatio, 20, \ 3259 "Ratio of call site execution to caller method invocation") \ 3260 \ 3261 develop_pd(intx, InlineFrequencyCount, \ 3262 "Count of call site execution necessary to trigger frequent " \ 3263 "inlining") \ 3264 \ 3265 develop(intx, InlineThrowCount, 50, \ 3266 "Force inlining of interpreted methods that throw this often") \ 3267 \ 3268 develop(intx, InlineThrowMaxSize, 200, \ 3269 "Force inlining of throwing methods smaller than this") \ 3270 \ 3271 develop(intx, ProfilerNodeSize, 1024, \ 3272 "Size in K to allocate for the Profile Nodes of each thread") \ 3273 \ 3274 product_pd(intx, PreInflateSpin, \ 3275 "Number of times to spin wait before inflation") \ 3276 \ 3277 /* gc parameters */ \ 3278 product(size_t, InitialHeapSize, 0, \ 3279 "Initial heap size (in bytes); zero means use ergonomics") \ 3280 \ 3281 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3282 "Maximum heap size (in bytes)") \ 3283 \ 3284 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3285 "Initial tenured generation size (in bytes)") \ 3286 \ 3287 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3288 "Initial new generation size (in bytes)") \ 3289 \ 3290 product(size_t, MaxNewSize, max_uintx, \ 3291 "Maximum new generation size (in bytes), max_uintx means set " \ 3292 "ergonomically") \ 3293 \ 3294 product(size_t, PretenureSizeThreshold, 0, \ 3295 "Maximum size in bytes of objects allocated in DefNew " \ 3296 "generation; zero means no maximum") \ 3297 \ 3298 product(size_t, TLABSize, 0, \ 3299 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3300 \ 3301 product(size_t, MinTLABSize, 2*K, \ 3302 "Minimum allowed TLAB size (in bytes)") \ 3303 range(1, max_uintx) \ 3304 \ 3305 product(uintx, TLABAllocationWeight, 35, \ 3306 "Allocation averaging weight") \ 3307 range(0, 100) \ 3308 \ 3309 /* Limit the lower bound of this flag to 1 as it is used */ \ 3310 /* in a division expression. */ \ 3311 product(uintx, TLABWasteTargetPercent, 1, \ 3312 "Percentage of Eden that can be wasted") \ 3313 range(1, 100) \ 3314 \ 3315 product(uintx, TLABRefillWasteFraction, 64, \ 3316 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3317 range(1, max_uintx) \ 3318 \ 3319 product(uintx, TLABWasteIncrement, 4, \ 3320 "Increment allowed waste at slow allocation") \ 3321 \ 3322 product(uintx, SurvivorRatio, 8, \ 3323 "Ratio of eden/survivor space size") \ 3324 \ 3325 product(uintx, NewRatio, 2, \ 3326 "Ratio of old/new generation sizes") \ 3327 \ 3328 product_pd(size_t, NewSizeThreadIncrease, \ 3329 "Additional size added to desired new generation size per " \ 3330 "non-daemon thread (in bytes)") \ 3331 \ 3332 product_pd(size_t, MetaspaceSize, \ 3333 "Initial size of Metaspaces (in bytes)") \ 3334 \ 3335 product(size_t, MaxMetaspaceSize, max_uintx, \ 3336 "Maximum size of Metaspaces (in bytes)") \ 3337 \ 3338 product(size_t, CompressedClassSpaceSize, 1*G, \ 3339 "Maximum size of class area in Metaspace when compressed " \ 3340 "class pointers are used") \ 3341 range(1*M, 3*G) \ 3342 \ 3343 manageable(uintx, MinHeapFreeRatio, 40, \ 3344 "The minimum percentage of heap free after GC to avoid expansion."\ 3345 " For most GCs this applies to the old generation. In G1 and" \ 3346 " ParallelGC it applies to the whole heap.") \ 3347 range(0, 100) \ 3348 constraint(MinHeapFreeRatioConstraintFunc) \ 3349 \ 3350 manageable(uintx, MaxHeapFreeRatio, 70, \ 3351 "The maximum percentage of heap free after GC to avoid shrinking."\ 3352 " For most GCs this applies to the old generation. In G1 and" \ 3353 " ParallelGC it applies to the whole heap.") \ 3354 range(0, 100) \ 3355 constraint(MaxHeapFreeRatioConstraintFunc) \ 3356 \ 3357 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3358 "Number of milliseconds per MB of free space in the heap") \ 3359 \ 3360 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3361 "The minimum change in heap space due to GC (in bytes)") \ 3362 \ 3363 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3364 "The minimum expansion of Metaspace (in bytes)") \ 3365 \ 3366 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3367 "The maximum percentage of Metaspace free after GC to avoid " \ 3368 "shrinking") \ 3369 range(0, 100) \ 3370 constraint(MaxMetaspaceFreeRatioConstraintFunc) \ 3371 \ 3372 product(uintx, MinMetaspaceFreeRatio, 40, \ 3373 "The minimum percentage of Metaspace free after GC to avoid " \ 3374 "expansion") \ 3375 range(0, 99) \ 3376 constraint(MinMetaspaceFreeRatioConstraintFunc) \ 3377 \ 3378 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3379 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3380 \ 3381 product(uintx, QueuedAllocationWarningCount, 0, \ 3382 "Number of times an allocation that queues behind a GC " \ 3383 "will retry before printing a warning") \ 3384 \ 3385 diagnostic(uintx, VerifyGCStartAt, 0, \ 3386 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3387 \ 3388 diagnostic(intx, VerifyGCLevel, 0, \ 3389 "Generation level at which to start +VerifyBefore/AfterGC") \ 3390 \ 3391 product(uintx, MaxTenuringThreshold, 15, \ 3392 "Maximum value for tenuring threshold") \ 3393 range(0, markOopDesc::max_age + 1) \ 3394 constraint(MaxTenuringThresholdConstraintFunc) \ 3395 \ 3396 product(uintx, InitialTenuringThreshold, 7, \ 3397 "Initial value for tenuring threshold") \ 3398 range(0, markOopDesc::max_age + 1) \ 3399 constraint(InitialTenuringThresholdConstraintFunc) \ 3400 \ 3401 product(uintx, TargetSurvivorRatio, 50, \ 3402 "Desired percentage of survivor space used after scavenge") \ 3403 range(0, 100) \ 3404 \ 3405 product(uintx, MarkSweepDeadRatio, 5, \ 3406 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3407 "Serial mark sweep treats this as both the minimum and maximum " \ 3408 "value. " \ 3409 "CMS uses this value only if it falls back to mark sweep. " \ 3410 "Par compact uses a variable scale based on the density of the " \ 3411 "generation and treats this as the maximum value when the heap " \ 3412 "is either completely full or completely empty. Par compact " \ 3413 "also has a smaller default value; see arguments.cpp.") \ 3414 range(0, 100) \ 3415 \ 3416 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3417 "How often should we fully compact the heap (ignoring the dead " \ 3418 "space parameters)") \ 3419 range(1, max_uintx) \ 3420 \ 3421 product(intx, PrintCMSStatistics, 0, \ 3422 "Statistics for CMS") \ 3423 \ 3424 product(bool, PrintCMSInitiationStatistics, false, \ 3425 "Statistics for initiating a CMS collection") \ 3426 \ 3427 product(intx, PrintFLSStatistics, 0, \ 3428 "Statistics for CMS' FreeListSpace") \ 3429 \ 3430 product(intx, PrintFLSCensus, 0, \ 3431 "Census for CMS' FreeListSpace") \ 3432 \ 3433 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3434 "Delay between expansion and allocation (in milliseconds)") \ 3435 \ 3436 develop(uintx, GCWorkerDelayMillis, 0, \ 3437 "Delay in scheduling GC workers (in milliseconds)") \ 3438 \ 3439 product(intx, DeferThrSuspendLoopCount, 4000, \ 3440 "(Unstable) Number of times to iterate in safepoint loop " \ 3441 "before blocking VM threads ") \ 3442 \ 3443 product(intx, DeferPollingPageLoopCount, -1, \ 3444 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3445 "before changing safepoint polling page to RO ") \ 3446 \ 3447 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3448 \ 3449 product(bool, PSChunkLargeArrays, true, \ 3450 "Process large arrays in chunks") \ 3451 \ 3452 product(uintx, GCDrainStackTargetSize, 64, \ 3453 "Number of entries we will try to leave on the stack " \ 3454 "during parallel gc") \ 3455 \ 3456 /* stack parameters */ \ 3457 product_pd(intx, StackYellowPages, \ 3458 "Number of yellow zone (recoverable overflows) pages") \ 3459 range(1, max_intx) \ 3460 \ 3461 product_pd(intx, StackRedPages, \ 3462 "Number of red zone (unrecoverable overflows) pages") \ 3463 range(1, max_intx) \ 3464 \ 3465 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3466 product_pd(intx, StackShadowPages, \ 3467 "Number of shadow zone (for overflow checking) pages " \ 3468 "this should exceed the depth of the VM and native call stack") \ 3469 range(1, 50) \ 3470 \ 3471 product_pd(intx, ThreadStackSize, \ 3472 "Thread Stack Size (in Kbytes)") \ 3473 \ 3474 product_pd(intx, VMThreadStackSize, \ 3475 "Non-Java Thread Stack Size (in Kbytes)") \ 3476 \ 3477 product_pd(intx, CompilerThreadStackSize, \ 3478 "Compiler Thread Stack Size (in Kbytes)") \ 3479 \ 3480 develop_pd(size_t, JVMInvokeMethodSlack, \ 3481 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3482 \ 3483 /* code cache parameters */ \ 3484 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3485 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3486 "Code cache segment size (in bytes) - smallest unit of " \ 3487 "allocation") \ 3488 range(1, 1024) \ 3489 \ 3490 develop_pd(intx, CodeEntryAlignment, \ 3491 "Code entry alignment for generated code (in bytes)") \ 3492 \ 3493 product_pd(intx, OptoLoopAlignment, \ 3494 "Align inner loops to zero relative to this modulus") \ 3495 \ 3496 product_pd(uintx, InitialCodeCacheSize, \ 3497 "Initial code cache size (in bytes)") \ 3498 \ 3499 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3500 "Minimum code cache size (in bytes) required to start VM.") \ 3501 \ 3502 product(bool, SegmentedCodeCache, false, \ 3503 "Use a segmented code cache") \ 3504 \ 3505 product_pd(uintx, ReservedCodeCacheSize, \ 3506 "Reserved code cache size (in bytes) - maximum code cache size") \ 3507 \ 3508 product_pd(uintx, NonProfiledCodeHeapSize, \ 3509 "Size of code heap with non-profiled methods (in bytes)") \ 3510 \ 3511 product_pd(uintx, ProfiledCodeHeapSize, \ 3512 "Size of code heap with profiled methods (in bytes)") \ 3513 \ 3514 product_pd(uintx, NonNMethodCodeHeapSize, \ 3515 "Size of code heap with non-nmethods (in bytes)") \ 3516 \ 3517 product_pd(uintx, CodeCacheExpansionSize, \ 3518 "Code cache expansion size (in bytes)") \ 3519 \ 3520 develop_pd(uintx, CodeCacheMinBlockLength, \ 3521 "Minimum number of segments in a code cache block") \ 3522 range(1, 100) \ 3523 \ 3524 notproduct(bool, ExitOnFullCodeCache, false, \ 3525 "Exit the VM if we fill the code cache") \ 3526 \ 3527 product(bool, UseCodeCacheFlushing, true, \ 3528 "Remove cold/old nmethods from the code cache") \ 3529 \ 3530 product(uintx, StartAggressiveSweepingAt, 10, \ 3531 "Start aggressive sweeping if X[%] of the code cache is free." \ 3532 "Segmented code cache: X[%] of the non-profiled heap." \ 3533 "Non-segmented code cache: X[%] of the total code cache") \ 3534 range(0, 100) \ 3535 \ 3536 /* interpreter debugging */ \ 3537 develop(intx, BinarySwitchThreshold, 5, \ 3538 "Minimal number of lookupswitch entries for rewriting to binary " \ 3539 "switch") \ 3540 \ 3541 develop(intx, StopInterpreterAt, 0, \ 3542 "Stop interpreter execution at specified bytecode number") \ 3543 \ 3544 develop(intx, TraceBytecodesAt, 0, \ 3545 "Trace bytecodes starting with specified bytecode number") \ 3546 \ 3547 /* compiler interface */ \ 3548 develop(intx, CIStart, 0, \ 3549 "The id of the first compilation to permit") \ 3550 \ 3551 develop(intx, CIStop, max_jint, \ 3552 "The id of the last compilation to permit") \ 3553 \ 3554 develop(intx, CIStartOSR, 0, \ 3555 "The id of the first osr compilation to permit " \ 3556 "(CICountOSR must be on)") \ 3557 \ 3558 develop(intx, CIStopOSR, max_jint, \ 3559 "The id of the last osr compilation to permit " \ 3560 "(CICountOSR must be on)") \ 3561 \ 3562 develop(intx, CIBreakAtOSR, -1, \ 3563 "The id of osr compilation to break at") \ 3564 \ 3565 develop(intx, CIBreakAt, -1, \ 3566 "The id of compilation to break at") \ 3567 \ 3568 product(ccstrlist, CompileOnly, "", \ 3569 "List of methods (pkg/class.name) to restrict compilation to") \ 3570 \ 3571 product(ccstr, CompileCommandFile, NULL, \ 3572 "Read compiler commands from this file [.hotspot_compiler]") \ 3573 \ 3574 product(ccstrlist, CompileCommand, "", \ 3575 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3576 \ 3577 develop(bool, ReplayCompiles, false, \ 3578 "Enable replay of compilations from ReplayDataFile") \ 3579 \ 3580 product(ccstr, ReplayDataFile, NULL, \ 3581 "File containing compilation replay information" \ 3582 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3583 \ 3584 product(ccstr, InlineDataFile, NULL, \ 3585 "File containing inlining replay information" \ 3586 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3587 \ 3588 develop(intx, ReplaySuppressInitializers, 2, \ 3589 "Control handling of class initialization during replay: " \ 3590 "0 - don't do anything special; " \ 3591 "1 - treat all class initializers as empty; " \ 3592 "2 - treat class initializers for application classes as empty; " \ 3593 "3 - allow all class initializers to run during bootstrap but " \ 3594 " pretend they are empty after starting replay") \ 3595 range(0, 3) \ 3596 \ 3597 develop(bool, ReplayIgnoreInitErrors, false, \ 3598 "Ignore exceptions thrown during initialization for replay") \ 3599 \ 3600 product(bool, DumpReplayDataOnError, true, \ 3601 "Record replay data for crashing compiler threads") \ 3602 \ 3603 product(bool, CICompilerCountPerCPU, false, \ 3604 "1 compiler thread for log(N CPUs)") \ 3605 \ 3606 develop(intx, CIFireOOMAt, -1, \ 3607 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3608 "(non-negative value throws OOM after this many CI accesses " \ 3609 "in each compile)") \ 3610 notproduct(intx, CICrashAt, -1, \ 3611 "id of compilation to trigger assert in compiler thread for " \ 3612 "the purpose of testing, e.g. generation of replay data") \ 3613 notproduct(bool, CIObjectFactoryVerify, false, \ 3614 "enable potentially expensive verification in ciObjectFactory") \ 3615 \ 3616 /* Priorities */ \ 3617 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3618 \ 3619 product(intx, ThreadPriorityPolicy, 0, \ 3620 "0 : Normal. "\ 3621 " VM chooses priorities that are appropriate for normal "\ 3622 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3623 " to normal native priority. Java priorities below " \ 3624 " NORM_PRIORITY map to lower native priority values. On "\ 3625 " Windows applications are allowed to use higher native "\ 3626 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3627 " not use the highest possible native priority, "\ 3628 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3629 " system threads. On Linux thread priorities are ignored "\ 3630 " because the OS does not support static priority in "\ 3631 " SCHED_OTHER scheduling class which is the only choice for "\ 3632 " non-root, non-realtime applications. "\ 3633 "1 : Aggressive. "\ 3634 " Java thread priorities map over to the entire range of "\ 3635 " native thread priorities. Higher Java thread priorities map "\ 3636 " to higher native thread priorities. This policy should be "\ 3637 " used with care, as sometimes it can cause performance "\ 3638 " degradation in the application and/or the entire system. On "\ 3639 " Linux this policy requires root privilege.") \ 3640 range(0, 1) \ 3641 \ 3642 product(bool, ThreadPriorityVerbose, false, \ 3643 "Print priority changes") \ 3644 \ 3645 product(intx, CompilerThreadPriority, -1, \ 3646 "The native priority at which compiler threads should run " \ 3647 "(-1 means no change)") \ 3648 \ 3649 product(intx, VMThreadPriority, -1, \ 3650 "The native priority at which the VM thread should run " \ 3651 "(-1 means no change)") \ 3652 \ 3653 product(bool, CompilerThreadHintNoPreempt, true, \ 3654 "(Solaris only) Give compiler threads an extra quanta") \ 3655 \ 3656 product(bool, VMThreadHintNoPreempt, false, \ 3657 "(Solaris only) Give VM thread an extra quanta") \ 3658 \ 3659 product(intx, JavaPriority1_To_OSPriority, -1, \ 3660 "Map Java priorities to OS priorities") \ 3661 \ 3662 product(intx, JavaPriority2_To_OSPriority, -1, \ 3663 "Map Java priorities to OS priorities") \ 3664 \ 3665 product(intx, JavaPriority3_To_OSPriority, -1, \ 3666 "Map Java priorities to OS priorities") \ 3667 \ 3668 product(intx, JavaPriority4_To_OSPriority, -1, \ 3669 "Map Java priorities to OS priorities") \ 3670 \ 3671 product(intx, JavaPriority5_To_OSPriority, -1, \ 3672 "Map Java priorities to OS priorities") \ 3673 \ 3674 product(intx, JavaPriority6_To_OSPriority, -1, \ 3675 "Map Java priorities to OS priorities") \ 3676 \ 3677 product(intx, JavaPriority7_To_OSPriority, -1, \ 3678 "Map Java priorities to OS priorities") \ 3679 \ 3680 product(intx, JavaPriority8_To_OSPriority, -1, \ 3681 "Map Java priorities to OS priorities") \ 3682 \ 3683 product(intx, JavaPriority9_To_OSPriority, -1, \ 3684 "Map Java priorities to OS priorities") \ 3685 \ 3686 product(intx, JavaPriority10_To_OSPriority,-1, \ 3687 "Map Java priorities to OS priorities") \ 3688 \ 3689 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3690 "Java thread priority 10 maps to critical scheduling priority") \ 3691 \ 3692 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3693 "Compiler thread(s) run at critical scheduling priority") \ 3694 \ 3695 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3696 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3697 \ 3698 /* compiler debugging */ \ 3699 notproduct(intx, CompileTheWorldStartAt, 1, \ 3700 "First class to consider when using +CompileTheWorld") \ 3701 \ 3702 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3703 "Last class to consider when using +CompileTheWorld") \ 3704 \ 3705 develop(intx, NewCodeParameter, 0, \ 3706 "Testing Only: Create a dedicated integer parameter before " \ 3707 "putback") \ 3708 \ 3709 /* new oopmap storage allocation */ \ 3710 develop(intx, MinOopMapAllocation, 8, \ 3711 "Minimum number of OopMap entries in an OopMapSet") \ 3712 \ 3713 /* Background Compilation */ \ 3714 develop(intx, LongCompileThreshold, 50, \ 3715 "Used with +TraceLongCompiles") \ 3716 \ 3717 product(intx, StarvationMonitorInterval, 200, \ 3718 "Pause between each check (in milliseconds)") \ 3719 \ 3720 /* recompilation */ \ 3721 product_pd(intx, CompileThreshold, \ 3722 "number of interpreted method invocations before (re-)compiling") \ 3723 \ 3724 product(double, CompileThresholdScaling, 1.0, \ 3725 "Factor to control when first compilation happens " \ 3726 "(both with and without tiered compilation): " \ 3727 "values greater than 1.0 delay counter overflow, " \ 3728 "values between 0 and 1.0 rush counter overflow, " \ 3729 "value of 1.0 leaves compilation thresholds unchanged " \ 3730 "value of 0.0 is equivalent to -Xint. " \ 3731 "" \ 3732 "Flag can be set as per-method option. " \ 3733 "If a value is specified for a method, compilation thresholds " \ 3734 "for that method are scaled by both the value of the global flag "\ 3735 "and the value of the per-method flag.") \ 3736 \ 3737 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3738 "Interpreter (tier 0) invocation notification frequency") \ 3739 \ 3740 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3741 "C1 without MDO (tier 2) invocation notification frequency") \ 3742 \ 3743 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3744 "C1 with MDO profiling (tier 3) invocation notification " \ 3745 "frequency") \ 3746 \ 3747 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3748 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3749 \ 3750 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3751 "Interpreter (tier 0) invocation notification frequency") \ 3752 \ 3753 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3754 "C1 without MDO (tier 2) invocation notification frequency") \ 3755 \ 3756 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3757 "C1 with MDO profiling (tier 3) invocation notification " \ 3758 "frequency") \ 3759 \ 3760 product(intx, Tier2CompileThreshold, 0, \ 3761 "threshold at which tier 2 compilation is invoked") \ 3762 \ 3763 product(intx, Tier2BackEdgeThreshold, 0, \ 3764 "Back edge threshold at which tier 2 compilation is invoked") \ 3765 \ 3766 product(intx, Tier3InvocationThreshold, 200, \ 3767 "Compile if number of method invocations crosses this " \ 3768 "threshold") \ 3769 \ 3770 product(intx, Tier3MinInvocationThreshold, 100, \ 3771 "Minimum invocation to compile at tier 3") \ 3772 \ 3773 product(intx, Tier3CompileThreshold, 2000, \ 3774 "Threshold at which tier 3 compilation is invoked (invocation " \ 3775 "minimum must be satisfied") \ 3776 \ 3777 product(intx, Tier3BackEdgeThreshold, 60000, \ 3778 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3779 \ 3780 product(intx, Tier4InvocationThreshold, 5000, \ 3781 "Compile if number of method invocations crosses this " \ 3782 "threshold") \ 3783 \ 3784 product(intx, Tier4MinInvocationThreshold, 600, \ 3785 "Minimum invocation to compile at tier 4") \ 3786 \ 3787 product(intx, Tier4CompileThreshold, 15000, \ 3788 "Threshold at which tier 4 compilation is invoked (invocation " \ 3789 "minimum must be satisfied") \ 3790 \ 3791 product(intx, Tier4BackEdgeThreshold, 40000, \ 3792 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3793 \ 3794 product(intx, Tier3DelayOn, 5, \ 3795 "If C2 queue size grows over this amount per compiler thread " \ 3796 "stop compiling at tier 3 and start compiling at tier 2") \ 3797 \ 3798 product(intx, Tier3DelayOff, 2, \ 3799 "If C2 queue size is less than this amount per compiler thread " \ 3800 "allow methods compiled at tier 2 transition to tier 3") \ 3801 \ 3802 product(intx, Tier3LoadFeedback, 5, \ 3803 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3804 "reaches this amount per compiler thread") \ 3805 \ 3806 product(intx, Tier4LoadFeedback, 3, \ 3807 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3808 "reaches this amount per compiler thread") \ 3809 \ 3810 product(intx, TieredCompileTaskTimeout, 50, \ 3811 "Kill compile task if method was not used within " \ 3812 "given timeout in milliseconds") \ 3813 \ 3814 product(intx, TieredStopAtLevel, 4, \ 3815 "Stop at given compilation level") \ 3816 \ 3817 product(intx, Tier0ProfilingStartPercentage, 200, \ 3818 "Start profiling in interpreter if the counters exceed tier 3 " \ 3819 "thresholds by the specified percentage") \ 3820 \ 3821 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3822 "Increase the compile threshold for C1 compilation if the code " \ 3823 "cache is filled by the specified percentage") \ 3824 range(0, 99) \ 3825 \ 3826 product(intx, TieredRateUpdateMinTime, 1, \ 3827 "Minimum rate sampling interval (in milliseconds)") \ 3828 \ 3829 product(intx, TieredRateUpdateMaxTime, 25, \ 3830 "Maximum rate sampling interval (in milliseconds)") \ 3831 \ 3832 product_pd(bool, TieredCompilation, \ 3833 "Enable tiered compilation") \ 3834 \ 3835 product(bool, PrintTieredEvents, false, \ 3836 "Print tiered events notifications") \ 3837 \ 3838 product_pd(intx, OnStackReplacePercentage, \ 3839 "NON_TIERED number of method invocations/branches (expressed as " \ 3840 "% of CompileThreshold) before (re-)compiling OSR code") \ 3841 \ 3842 product(intx, InterpreterProfilePercentage, 33, \ 3843 "NON_TIERED number of method invocations/branches (expressed as " \ 3844 "% of CompileThreshold) before profiling in the interpreter") \ 3845 range(0, 100) \ 3846 \ 3847 develop(intx, MaxRecompilationSearchLength, 10, \ 3848 "The maximum number of frames to inspect when searching for " \ 3849 "recompilee") \ 3850 \ 3851 develop(intx, MaxInterpretedSearchLength, 3, \ 3852 "The maximum number of interpreted frames to skip when searching "\ 3853 "for recompilee") \ 3854 \ 3855 develop(intx, DesiredMethodLimit, 8000, \ 3856 "The desired maximum method size (in bytecodes) after inlining") \ 3857 \ 3858 develop(intx, HugeMethodLimit, 8000, \ 3859 "Don't compile methods larger than this if " \ 3860 "+DontCompileHugeMethods") \ 3861 \ 3862 /* New JDK 1.4 reflection implementation */ \ 3863 \ 3864 develop(intx, FastSuperclassLimit, 8, \ 3865 "Depth of hardwired instanceof accelerator array") \ 3866 \ 3867 /* Properties for Java libraries */ \ 3868 \ 3869 product(size_t, MaxDirectMemorySize, 0, \ 3870 "Maximum total size of NIO direct-buffer allocations") \ 3871 \ 3872 /* Flags used for temporary code during development */ \ 3873 \ 3874 diagnostic(bool, UseNewCode, false, \ 3875 "Testing Only: Use the new version while testing") \ 3876 \ 3877 diagnostic(bool, UseNewCode2, false, \ 3878 "Testing Only: Use the new version while testing") \ 3879 \ 3880 diagnostic(bool, UseNewCode3, false, \ 3881 "Testing Only: Use the new version while testing") \ 3882 \ 3883 /* flags for performance data collection */ \ 3884 \ 3885 product(bool, UsePerfData, falseInEmbedded, \ 3886 "Flag to disable jvmstat instrumentation for performance testing "\ 3887 "and problem isolation purposes") \ 3888 \ 3889 product(bool, PerfDataSaveToFile, false, \ 3890 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3891 \ 3892 product(ccstr, PerfDataSaveFile, NULL, \ 3893 "Save PerfData memory to the specified absolute pathname. " \ 3894 "The string %p in the file name (if present) " \ 3895 "will be replaced by pid") \ 3896 \ 3897 product(intx, PerfDataSamplingInterval, 50, \ 3898 "Data sampling interval (in milliseconds)") \ 3899 \ 3900 develop(bool, PerfTraceDataCreation, false, \ 3901 "Trace creation of Performance Data Entries") \ 3902 \ 3903 develop(bool, PerfTraceMemOps, false, \ 3904 "Trace PerfMemory create/attach/detach calls") \ 3905 \ 3906 product(bool, PerfDisableSharedMem, false, \ 3907 "Store performance data in standard memory") \ 3908 \ 3909 product(intx, PerfDataMemorySize, 32*K, \ 3910 "Size of performance data memory region. Will be rounded " \ 3911 "up to a multiple of the native os page size.") \ 3912 \ 3913 product(intx, PerfMaxStringConstLength, 1024, \ 3914 "Maximum PerfStringConstant string length before truncation") \ 3915 \ 3916 product(bool, PerfAllowAtExitRegistration, false, \ 3917 "Allow registration of atexit() methods") \ 3918 \ 3919 product(bool, PerfBypassFileSystemCheck, false, \ 3920 "Bypass Win32 file system criteria checks (Windows Only)") \ 3921 \ 3922 product(intx, UnguardOnExecutionViolation, 0, \ 3923 "Unguard page and retry on no-execute fault (Win32 only) " \ 3924 "0=off, 1=conservative, 2=aggressive") \ 3925 range(0, 2) \ 3926 \ 3927 /* Serviceability Support */ \ 3928 \ 3929 product(bool, ManagementServer, false, \ 3930 "Create JMX Management Server") \ 3931 \ 3932 product(bool, DisableAttachMechanism, false, \ 3933 "Disable mechanism that allows tools to attach to this VM") \ 3934 \ 3935 product(bool, StartAttachListener, false, \ 3936 "Always start Attach Listener at VM startup") \ 3937 \ 3938 manageable(bool, PrintConcurrentLocks, false, \ 3939 "Print java.util.concurrent locks in thread dump") \ 3940 \ 3941 product(bool, TransmitErrorReport, false, \ 3942 "Enable error report transmission on erroneous termination") \ 3943 \ 3944 product(ccstr, ErrorReportServer, NULL, \ 3945 "Override built-in error report server address") \ 3946 \ 3947 /* Shared spaces */ \ 3948 \ 3949 product(bool, UseSharedSpaces, true, \ 3950 "Use shared spaces for metadata") \ 3951 \ 3952 product(bool, VerifySharedSpaces, false, \ 3953 "Verify shared spaces (false for default archive, true for " \ 3954 "archive specified by -XX:SharedArchiveFile)") \ 3955 \ 3956 product(bool, RequireSharedSpaces, false, \ 3957 "Require shared spaces for metadata") \ 3958 \ 3959 product(bool, DumpSharedSpaces, false, \ 3960 "Special mode: JVM reads a class list, loads classes, builds " \ 3961 "shared spaces, and dumps the shared spaces to a file to be " \ 3962 "used in future JVM runs") \ 3963 \ 3964 product(bool, PrintSharedSpaces, false, \ 3965 "Print usage of shared spaces") \ 3966 \ 3967 product(bool, PrintSharedArchiveAndExit, false, \ 3968 "Print shared archive file contents") \ 3969 \ 3970 product(bool, PrintSharedDictionary, false, \ 3971 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3972 "dictionary") \ 3973 \ 3974 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3975 "Size of read-write space for metadata (in bytes)") \ 3976 \ 3977 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3978 "Size of read-only space for metadata (in bytes)") \ 3979 \ 3980 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3981 "Size of the shared miscellaneous data area (in bytes)") \ 3982 \ 3983 product(uintx, SharedMiscCodeSize, 120*K, \ 3984 "Size of the shared miscellaneous code area (in bytes)") \ 3985 \ 3986 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3987 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3988 "Address to allocate shared memory region for class data") \ 3989 \ 3990 product(uintx, SharedSymbolTableBucketSize, 4, \ 3991 "Average number of symbols per bucket in shared table") \ 3992 \ 3993 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3994 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3995 "classes. Just exclude them from the shared dictionary.") \ 3996 \ 3997 diagnostic(bool, PrintMethodHandleStubs, false, \ 3998 "Print generated stub code for method handles") \ 3999 \ 4000 develop(bool, TraceMethodHandles, false, \ 4001 "trace internal method handle operations") \ 4002 \ 4003 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4004 "perform extra checks when constructing method handles") \ 4005 \ 4006 diagnostic(bool, ShowHiddenFrames, false, \ 4007 "show method handle implementation frames (usually hidden)") \ 4008 \ 4009 experimental(bool, TrustFinalNonStaticFields, false, \ 4010 "trust final non-static declarations for constant folding") \ 4011 \ 4012 diagnostic(bool, FoldStableValues, true, \ 4013 "Optimize loads from stable fields (marked w/ @Stable)") \ 4014 \ 4015 develop(bool, TraceInvokeDynamic, false, \ 4016 "trace internal invoke dynamic operations") \ 4017 \ 4018 diagnostic(bool, PauseAtStartup, false, \ 4019 "Causes the VM to pause at startup time and wait for the pause " \ 4020 "file to be removed (default: ./vm.paused.<pid>)") \ 4021 \ 4022 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4023 "The file to create and for whose removal to await when pausing " \ 4024 "at startup. (default: ./vm.paused.<pid>)") \ 4025 \ 4026 diagnostic(bool, PauseAtExit, false, \ 4027 "Pause and wait for keypress on exit if a debugger is attached") \ 4028 \ 4029 product(bool, ExtendedDTraceProbes, false, \ 4030 "Enable performance-impacting dtrace probes") \ 4031 \ 4032 product(bool, DTraceMethodProbes, false, \ 4033 "Enable dtrace probes for method-entry and method-exit") \ 4034 \ 4035 product(bool, DTraceAllocProbes, false, \ 4036 "Enable dtrace probes for object allocation") \ 4037 \ 4038 product(bool, DTraceMonitorProbes, false, \ 4039 "Enable dtrace probes for monitor events") \ 4040 \ 4041 product(bool, RelaxAccessControlCheck, false, \ 4042 "Relax the access control checks in the verifier") \ 4043 \ 4044 product(uintx, StringTableSize, defaultStringTableSize, \ 4045 "Number of buckets in the interned String table") \ 4046 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4047 \ 4048 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4049 "Number of buckets in the JVM internal Symbol table") \ 4050 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4051 \ 4052 product(bool, UseStringDeduplication, false, \ 4053 "Use string deduplication") \ 4054 \ 4055 product(bool, PrintStringDeduplicationStatistics, false, \ 4056 "Print string deduplication statistics") \ 4057 \ 4058 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4059 "A string must reach this age (or be promoted to an old region) " \ 4060 "to be considered for deduplication") \ 4061 range(1, markOopDesc::max_age) \ 4062 \ 4063 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4064 "Force table resize every time the table is scanned") \ 4065 \ 4066 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4067 "Force table rehash every time the table is scanned") \ 4068 \ 4069 develop(bool, TraceDefaultMethods, false, \ 4070 "Trace the default method processing steps") \ 4071 \ 4072 develop(bool, VerifyGenericSignatures, false, \ 4073 "Abort VM on erroneous or inconsistent generic signatures") \ 4074 \ 4075 diagnostic(bool, WhiteBoxAPI, false, \ 4076 "Enable internal testing APIs") \ 4077 \ 4078 product(bool, PrintGCCause, true, \ 4079 "Include GC cause in GC logging") \ 4080 \ 4081 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4082 "Default survivor space alignment in bytes") \ 4083 constraint(SurvivorAlignmentInBytesConstraintFunc) \ 4084 \ 4085 product(bool , AllowNonVirtualCalls, false, \ 4086 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4087 \ 4088 product(ccstr, DumpLoadedClassList, NULL, \ 4089 "Dump the names all loaded classes, that could be stored into " \ 4090 "the CDS archive, in the specified file") \ 4091 \ 4092 product(ccstr, SharedClassListFile, NULL, \ 4093 "Override the default CDS class list") \ 4094 \ 4095 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4096 "Override the default location of the CDS archive file") \ 4097 \ 4098 product(ccstr, ExtraSharedClassListFile, NULL, \ 4099 "Extra classlist for building the CDS archive file") \ 4100 \ 4101 experimental(size_t, ArrayAllocatorMallocLimit, \ 4102 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4103 "Allocation less than this value will be allocated " \ 4104 "using malloc. Larger allocations will use mmap.") \ 4105 \ 4106 experimental(bool, AlwaysAtomicAccesses, false, \ 4107 "Accesses to all variables should always be atomic") \ 4108 \ 4109 product(bool, EnableTracing, false, \ 4110 "Enable event-based tracing") \ 4111 \ 4112 product(bool, UseLockedTracing, false, \ 4113 "Use locked-tracing when doing event-based tracing") \ 4114 \ 4115 diagnostic(bool, UseUnalignedAccesses, false, \ 4116 "Use unaligned memory accesses in sun.misc.Unsafe") \ 4117 \ 4118 product_pd(bool, PreserveFramePointer, \ 4119 "Use the FP register for holding the frame pointer " \ 4120 "and not as a general purpose register.") 4121 4122/* 4123 * Macros for factoring of globals 4124 */ 4125 4126// Interface macros 4127#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4128#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4129#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4130#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4131#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4132#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4133#ifdef PRODUCT 4134#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4135#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4136#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4137#else 4138#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4139#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4140#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4141#endif // PRODUCT 4142// Special LP64 flags, product only needed for now. 4143#ifdef _LP64 4144#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4145#else 4146#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4147#endif // _LP64 4148 4149// Implementation macros 4150#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4151#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4152#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4153#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4154#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4155#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4156#ifdef PRODUCT 4157#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4158#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4159#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4160#else 4161#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4162#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4163#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4164#endif // PRODUCT 4165#ifdef _LP64 4166#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4167#else 4168#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4169#endif // _LP64 4170 4171// Only materialize src code for range checking when required, ignore otherwise 4172#define IGNORE_RANGE(a, b) 4173// Only materialize src code for contraint checking when required, ignore otherwise 4174#define IGNORE_CONSTRAINT(func) 4175 4176RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4177 DECLARE_PD_DEVELOPER_FLAG, \ 4178 DECLARE_PRODUCT_FLAG, \ 4179 DECLARE_PD_PRODUCT_FLAG, \ 4180 DECLARE_DIAGNOSTIC_FLAG, \ 4181 DECLARE_EXPERIMENTAL_FLAG, \ 4182 DECLARE_NOTPRODUCT_FLAG, \ 4183 DECLARE_MANAGEABLE_FLAG, \ 4184 DECLARE_PRODUCT_RW_FLAG, \ 4185 DECLARE_LP64_PRODUCT_FLAG, \ 4186 IGNORE_RANGE, \ 4187 IGNORE_CONSTRAINT) 4188 4189RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4190 DECLARE_PD_DEVELOPER_FLAG, \ 4191 DECLARE_PRODUCT_FLAG, \ 4192 DECLARE_PD_PRODUCT_FLAG, \ 4193 DECLARE_DIAGNOSTIC_FLAG, \ 4194 DECLARE_NOTPRODUCT_FLAG, \ 4195 IGNORE_RANGE, \ 4196 IGNORE_CONSTRAINT) 4197 4198ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4199 DECLARE_PRODUCT_FLAG, \ 4200 DECLARE_DIAGNOSTIC_FLAG, \ 4201 DECLARE_EXPERIMENTAL_FLAG, \ 4202 DECLARE_NOTPRODUCT_FLAG, \ 4203 IGNORE_RANGE, \ 4204 IGNORE_CONSTRAINT) 4205 4206// Extensions 4207 4208#include "runtime/globals_ext.hpp" 4209 4210#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4211