globals.hpp revision 9299:050821833f00
1254794Sdumbbell/* 2254794Sdumbbell * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3254794Sdumbbell * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4254794Sdumbbell * 5254794Sdumbbell * This code is free software; you can redistribute it and/or modify it 6254794Sdumbbell * under the terms of the GNU General Public License version 2 only, as 7254794Sdumbbell * published by the Free Software Foundation. 8254794Sdumbbell * 9254794Sdumbbell * This code is distributed in the hope that it will be useful, but WITHOUT 10254794Sdumbbell * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11254794Sdumbbell * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12254794Sdumbbell * version 2 for more details (a copy is included in the LICENSE file that 13254794Sdumbbell * accompanied this code). 14254794Sdumbbell * 15254794Sdumbbell * You should have received a copy of the GNU General Public License version 16254794Sdumbbell * 2 along with this work; if not, write to the Free Software Foundation, 17254794Sdumbbell * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18254794Sdumbbell * 19254794Sdumbbell * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20254794Sdumbbell * or visit www.oracle.com if you need additional information or have any 21254794Sdumbbell * questions. 22254794Sdumbbell * 23254794Sdumbbell */ 24254794Sdumbbell 25254794Sdumbbell#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26254794Sdumbbell#define SHARE_VM_RUNTIME_GLOBALS_HPP 27254794Sdumbbell 28254794Sdumbbell#include <float.h> 29254794Sdumbbell#include "utilities/debug.hpp" 30254794Sdumbbell#include <float.h> // for DBL_MAX 31254794Sdumbbell 32254794Sdumbbell// use this for flags that are true per default in the tiered build 33254794Sdumbbell// but false in non-tiered builds, and vice versa 34254794Sdumbbell#ifdef TIERED 35254794Sdumbbell#define trueInTiered true 36254794Sdumbbell#define falseInTiered false 37254794Sdumbbell#else 38254794Sdumbbell#define trueInTiered false 39254794Sdumbbell#define falseInTiered true 40254794Sdumbbell#endif 41254794Sdumbbell 42254794Sdumbbell#ifdef TARGET_ARCH_x86 43254794Sdumbbell# include "globals_x86.hpp" 44254794Sdumbbell#endif 45254794Sdumbbell#ifdef TARGET_ARCH_sparc 46254794Sdumbbell# include "globals_sparc.hpp" 47254794Sdumbbell#endif 48254794Sdumbbell#ifdef TARGET_ARCH_zero 49254794Sdumbbell# include "globals_zero.hpp" 50254794Sdumbbell#endif 51254794Sdumbbell#ifdef TARGET_ARCH_arm 52254794Sdumbbell# include "globals_arm.hpp" 53254794Sdumbbell#endif 54254794Sdumbbell#ifdef TARGET_ARCH_ppc 55254794Sdumbbell# include "globals_ppc.hpp" 56254794Sdumbbell#endif 57254794Sdumbbell#ifdef TARGET_ARCH_aarch64 58254794Sdumbbell# include "globals_aarch64.hpp" 59254794Sdumbbell#endif 60254794Sdumbbell#ifdef TARGET_OS_FAMILY_linux 61254794Sdumbbell# include "globals_linux.hpp" 62254794Sdumbbell#endif 63254794Sdumbbell#ifdef TARGET_OS_FAMILY_solaris 64254794Sdumbbell# include "globals_solaris.hpp" 65254794Sdumbbell#endif 66254794Sdumbbell#ifdef TARGET_OS_FAMILY_windows 67254794Sdumbbell# include "globals_windows.hpp" 68254794Sdumbbell#endif 69254794Sdumbbell#ifdef TARGET_OS_FAMILY_aix 70254794Sdumbbell# include "globals_aix.hpp" 71254794Sdumbbell#endif 72254794Sdumbbell#ifdef TARGET_OS_FAMILY_bsd 73254794Sdumbbell# include "globals_bsd.hpp" 74254794Sdumbbell#endif 75254794Sdumbbell#ifdef TARGET_OS_ARCH_linux_x86 76254794Sdumbbell# include "globals_linux_x86.hpp" 77254794Sdumbbell#endif 78254794Sdumbbell#ifdef TARGET_OS_ARCH_linux_sparc 79254794Sdumbbell# include "globals_linux_sparc.hpp" 80254794Sdumbbell#endif 81254794Sdumbbell#ifdef TARGET_OS_ARCH_linux_zero 82254794Sdumbbell# include "globals_linux_zero.hpp" 83254794Sdumbbell#endif 84254794Sdumbbell#ifdef TARGET_OS_ARCH_solaris_x86 85254794Sdumbbell# include "globals_solaris_x86.hpp" 86254794Sdumbbell#endif 87254794Sdumbbell#ifdef TARGET_OS_ARCH_solaris_sparc 88254794Sdumbbell# include "globals_solaris_sparc.hpp" 89254794Sdumbbell#endif 90254794Sdumbbell#ifdef TARGET_OS_ARCH_windows_x86 91254794Sdumbbell# include "globals_windows_x86.hpp" 92254794Sdumbbell#endif 93254794Sdumbbell#ifdef TARGET_OS_ARCH_linux_arm 94254794Sdumbbell# include "globals_linux_arm.hpp" 95280183Sdumbbell#endif 96254794Sdumbbell#ifdef TARGET_OS_ARCH_linux_ppc 97254794Sdumbbell# include "globals_linux_ppc.hpp" 98254794Sdumbbell#endif 99254794Sdumbbell#ifdef TARGET_OS_ARCH_linux_aarch64 100254794Sdumbbell# include "globals_linux_aarch64.hpp" 101254794Sdumbbell#endif 102254794Sdumbbell#ifdef TARGET_OS_ARCH_aix_ppc 103254794Sdumbbell# include "globals_aix_ppc.hpp" 104254794Sdumbbell#endif 105254794Sdumbbell#ifdef TARGET_OS_ARCH_bsd_x86 106254794Sdumbbell# include "globals_bsd_x86.hpp" 107254794Sdumbbell#endif 108254794Sdumbbell#ifdef TARGET_OS_ARCH_bsd_zero 109254794Sdumbbell# include "globals_bsd_zero.hpp" 110254794Sdumbbell#endif 111254794Sdumbbell#ifdef COMPILER1 112254794Sdumbbell#ifdef TARGET_ARCH_x86 113254794Sdumbbell# include "c1_globals_x86.hpp" 114254794Sdumbbell#endif 115254794Sdumbbell#ifdef TARGET_ARCH_sparc 116254794Sdumbbell# include "c1_globals_sparc.hpp" 117254794Sdumbbell#endif 118254794Sdumbbell#ifdef TARGET_ARCH_arm 119254794Sdumbbell# include "c1_globals_arm.hpp" 120254794Sdumbbell#endif 121254794Sdumbbell#ifdef TARGET_ARCH_aarch64 122254794Sdumbbell# include "c1_globals_aarch64.hpp" 123254794Sdumbbell#endif 124254794Sdumbbell#ifdef TARGET_OS_FAMILY_linux 125254794Sdumbbell# include "c1_globals_linux.hpp" 126254794Sdumbbell#endif 127254794Sdumbbell#ifdef TARGET_OS_FAMILY_solaris 128254794Sdumbbell# include "c1_globals_solaris.hpp" 129254794Sdumbbell#endif 130254794Sdumbbell#ifdef TARGET_OS_FAMILY_windows 131254794Sdumbbell# include "c1_globals_windows.hpp" 132280183Sdumbbell#endif 133254794Sdumbbell#ifdef TARGET_OS_FAMILY_aix 134254794Sdumbbell# include "c1_globals_aix.hpp" 135254794Sdumbbell#endif 136254794Sdumbbell#ifdef TARGET_OS_FAMILY_bsd 137254794Sdumbbell# include "c1_globals_bsd.hpp" 138254794Sdumbbell#endif 139254794Sdumbbell#ifdef TARGET_ARCH_ppc 140254794Sdumbbell# include "c1_globals_ppc.hpp" 141254794Sdumbbell#endif 142254794Sdumbbell#endif 143254794Sdumbbell#ifdef COMPILER2 144254794Sdumbbell#ifdef TARGET_ARCH_x86 145254794Sdumbbell# include "c2_globals_x86.hpp" 146254794Sdumbbell#endif 147254794Sdumbbell#ifdef TARGET_ARCH_sparc 148254794Sdumbbell# include "c2_globals_sparc.hpp" 149254794Sdumbbell#endif 150280183Sdumbbell#ifdef TARGET_ARCH_arm 151254794Sdumbbell# include "c2_globals_arm.hpp" 152254794Sdumbbell#endif 153254794Sdumbbell#ifdef TARGET_ARCH_ppc 154254794Sdumbbell# include "c2_globals_ppc.hpp" 155254794Sdumbbell#endif 156254794Sdumbbell#ifdef TARGET_ARCH_aarch64 157254794Sdumbbell# include "c2_globals_aarch64.hpp" 158254794Sdumbbell#endif 159254794Sdumbbell#ifdef TARGET_OS_FAMILY_linux 160254794Sdumbbell# include "c2_globals_linux.hpp" 161254794Sdumbbell#endif 162254794Sdumbbell#ifdef TARGET_OS_FAMILY_solaris 163254794Sdumbbell# include "c2_globals_solaris.hpp" 164254794Sdumbbell#endif 165254794Sdumbbell#ifdef TARGET_OS_FAMILY_windows 166254794Sdumbbell# include "c2_globals_windows.hpp" 167254794Sdumbbell#endif 168254794Sdumbbell#ifdef TARGET_OS_FAMILY_aix 169254794Sdumbbell# include "c2_globals_aix.hpp" 170254794Sdumbbell#endif 171254794Sdumbbell#ifdef TARGET_OS_FAMILY_bsd 172254794Sdumbbell# include "c2_globals_bsd.hpp" 173254794Sdumbbell#endif 174254794Sdumbbell#endif 175254794Sdumbbell#ifdef SHARK 176254794Sdumbbell#ifdef TARGET_ARCH_zero 177254794Sdumbbell# include "shark_globals_zero.hpp" 178254794Sdumbbell#endif 179254794Sdumbbell#endif 180254794Sdumbbell 181254794Sdumbbell#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI 182254794Sdumbbelldefine_pd_global(bool, BackgroundCompilation, false); 183254794Sdumbbelldefine_pd_global(bool, UseTLAB, false); 184254794Sdumbbelldefine_pd_global(bool, CICompileOSR, false); 185254794Sdumbbelldefine_pd_global(bool, UseTypeProfile, false); 186254794Sdumbbelldefine_pd_global(bool, UseOnStackReplacement, false); 187280183Sdumbbelldefine_pd_global(bool, InlineIntrinsics, false); 188define_pd_global(bool, PreferInterpreterNativeStubs, true); 189define_pd_global(bool, ProfileInterpreter, false); 190define_pd_global(bool, ProfileTraps, false); 191define_pd_global(bool, TieredCompilation, false); 192 193define_pd_global(intx, CompileThreshold, 0); 194 195define_pd_global(intx, OnStackReplacePercentage, 0); 196define_pd_global(bool, ResizeTLAB, false); 197define_pd_global(intx, FreqInlineSize, 0); 198define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 199define_pd_global(intx, InlineClassNatives, true); 200define_pd_global(intx, InlineUnsafeOps, true); 201define_pd_global(intx, InitialCodeCacheSize, 160*K); 202define_pd_global(intx, ReservedCodeCacheSize, 32*M); 203define_pd_global(intx, NonProfiledCodeHeapSize, 0); 204define_pd_global(intx, ProfiledCodeHeapSize, 0); 205define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 206 207define_pd_global(intx, CodeCacheExpansionSize, 32*K); 208define_pd_global(intx, CodeCacheMinBlockLength, 1); 209define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 210define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 211define_pd_global(bool, NeverActAsServerClassMachine, true); 212define_pd_global(uint64_t,MaxRAM, 1ULL*G); 213#define CI_COMPILER_COUNT 0 214#else 215 216#if defined(COMPILER2) || INCLUDE_JVMCI 217#define CI_COMPILER_COUNT 2 218#else 219#define CI_COMPILER_COUNT 1 220#endif // COMPILER2 || INCLUDE_JVMCI 221 222#endif // no compilers 223 224// string type aliases used only in this file 225typedef const char* ccstr; 226typedef const char* ccstrlist; // represents string arguments which accumulate 227 228struct Flag { 229 enum Flags { 230 // value origin 231 DEFAULT = 0, 232 COMMAND_LINE = 1, 233 ENVIRON_VAR = 2, 234 CONFIG_FILE = 3, 235 MANAGEMENT = 4, 236 ERGONOMIC = 5, 237 ATTACH_ON_DEMAND = 6, 238 INTERNAL = 7, 239 240 LAST_VALUE_ORIGIN = INTERNAL, 241 VALUE_ORIGIN_BITS = 4, 242 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 243 244 // flag kind 245 KIND_PRODUCT = 1 << 4, 246 KIND_MANAGEABLE = 1 << 5, 247 KIND_DIAGNOSTIC = 1 << 6, 248 KIND_EXPERIMENTAL = 1 << 7, 249 KIND_NOT_PRODUCT = 1 << 8, 250 KIND_DEVELOP = 1 << 9, 251 KIND_PLATFORM_DEPENDENT = 1 << 10, 252 KIND_READ_WRITE = 1 << 11, 253 KIND_C1 = 1 << 12, 254 KIND_C2 = 1 << 13, 255 KIND_ARCH = 1 << 14, 256 KIND_SHARK = 1 << 15, 257 KIND_LP64_PRODUCT = 1 << 16, 258 KIND_COMMERCIAL = 1 << 17, 259 KIND_JVMCI = 1 << 18, 260 261 KIND_MASK = ~VALUE_ORIGIN_MASK 262 }; 263 264 enum Error { 265 // no error 266 SUCCESS = 0, 267 // flag name is missing 268 MISSING_NAME, 269 // flag value is missing 270 MISSING_VALUE, 271 // error parsing the textual form of the value 272 WRONG_FORMAT, 273 // flag is not writeable 274 NON_WRITABLE, 275 // flag value is outside of its bounds 276 OUT_OF_BOUNDS, 277 // flag value violates its constraint 278 VIOLATES_CONSTRAINT, 279 // there is no flag with the given name 280 INVALID_FLAG, 281 // other, unspecified error related to setting the flag 282 ERR_OTHER 283 }; 284 285 enum MsgType { 286 NONE = 0, 287 DIAGNOSTIC_FLAG_BUT_LOCKED, 288 EXPERIMENTAL_FLAG_BUT_LOCKED, 289 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 290 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 291 }; 292 293 const char* _type; 294 const char* _name; 295 void* _addr; 296 NOT_PRODUCT(const char* _doc;) 297 Flags _flags; 298 299 // points to all Flags static array 300 static Flag* flags; 301 302 // number of flags 303 static size_t numFlags; 304 305 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 306 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 307 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 308 309 void check_writable(); 310 311 bool is_bool() const; 312 bool get_bool() const; 313 void set_bool(bool value); 314 315 bool is_int() const; 316 int get_int() const; 317 void set_int(int value); 318 319 bool is_uint() const; 320 uint get_uint() const; 321 void set_uint(uint value); 322 323 bool is_intx() const; 324 intx get_intx() const; 325 void set_intx(intx value); 326 327 bool is_uintx() const; 328 uintx get_uintx() const; 329 void set_uintx(uintx value); 330 331 bool is_uint64_t() const; 332 uint64_t get_uint64_t() const; 333 void set_uint64_t(uint64_t value); 334 335 bool is_size_t() const; 336 size_t get_size_t() const; 337 void set_size_t(size_t value); 338 339 bool is_double() const; 340 double get_double() const; 341 void set_double(double value); 342 343 bool is_ccstr() const; 344 bool ccstr_accumulates() const; 345 ccstr get_ccstr() const; 346 void set_ccstr(ccstr value); 347 348 Flags get_origin(); 349 void set_origin(Flags origin); 350 351 bool is_default(); 352 bool is_ergonomic(); 353 bool is_command_line(); 354 355 bool is_product() const; 356 bool is_manageable() const; 357 bool is_diagnostic() const; 358 bool is_experimental() const; 359 bool is_notproduct() const; 360 bool is_develop() const; 361 bool is_read_write() const; 362 bool is_commercial() const; 363 364 bool is_constant_in_binary() const; 365 366 bool is_unlocker() const; 367 bool is_unlocked() const; 368 bool is_writeable() const; 369 bool is_external() const; 370 371 bool is_unlocker_ext() const; 372 bool is_unlocked_ext() const; 373 bool is_writeable_ext() const; 374 bool is_external_ext() const; 375 376 void unlock_diagnostic(); 377 378 Flag::MsgType get_locked_message(char*, int) const; 379 void get_locked_message_ext(char*, int) const; 380 381 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 382 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 383 void print_kind(outputStream* st); 384 void print_as_flag(outputStream* st); 385 386 static const char* flag_error_str(Flag::Error error); 387}; 388 389// debug flags control various aspects of the VM and are global accessible 390 391// use FlagSetting to temporarily change some debug flag 392// e.g. FlagSetting fs(DebugThisAndThat, true); 393// restored to previous value upon leaving scope 394class FlagSetting { 395 bool val; 396 bool* flag; 397 public: 398 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 399 ~FlagSetting() { *flag = val; } 400}; 401 402 403class CounterSetting { 404 intx* counter; 405 public: 406 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 407 ~CounterSetting() { (*counter)--; } 408}; 409 410class IntFlagSetting { 411 int val; 412 int* flag; 413 public: 414 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 415 ~IntFlagSetting() { *flag = val; } 416}; 417 418class UIntFlagSetting { 419 uint val; 420 uint* flag; 421 public: 422 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 423 ~UIntFlagSetting() { *flag = val; } 424}; 425 426class UIntXFlagSetting { 427 uintx val; 428 uintx* flag; 429 public: 430 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 431 ~UIntXFlagSetting() { *flag = val; } 432}; 433 434class DoubleFlagSetting { 435 double val; 436 double* flag; 437 public: 438 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 439 ~DoubleFlagSetting() { *flag = val; } 440}; 441 442class SizeTFlagSetting { 443 size_t val; 444 size_t* flag; 445 public: 446 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 447 ~SizeTFlagSetting() { *flag = val; } 448}; 449 450 451class CommandLineFlags { 452public: 453 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 454 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); } 455 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 456 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 457 458 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 459 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); } 460 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 461 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 462 463 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 464 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); } 465 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 466 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 467 468 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 469 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); } 470 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 471 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 472 473 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 474 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); } 475 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 476 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 477 478 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 479 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); } 480 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 481 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 482 483 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 484 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); } 485 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 486 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 487 488 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 489 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); } 490 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 491 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 492 493 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 494 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); } 495 // Contract: Flag will make private copy of the incoming value. 496 // Outgoing value is always malloc-ed, and caller MUST call free. 497 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 498 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 499 500 // Returns false if name is not a command line flag. 501 static bool wasSetOnCmdline(const char* name, bool* value); 502 static void printSetFlags(outputStream* out); 503 504 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 505 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 506 507 static void verify() PRODUCT_RETURN; 508}; 509 510// use this for flags that are true by default in the debug version but 511// false in the optimized version, and vice versa 512#ifdef ASSERT 513#define trueInDebug true 514#define falseInDebug false 515#else 516#define trueInDebug false 517#define falseInDebug true 518#endif 519 520// use this for flags that are true per default in the product build 521// but false in development builds, and vice versa 522#ifdef PRODUCT 523#define trueInProduct true 524#define falseInProduct false 525#else 526#define trueInProduct false 527#define falseInProduct true 528#endif 529 530#ifdef JAVASE_EMBEDDED 531#define falseInEmbedded false 532#else 533#define falseInEmbedded true 534#endif 535 536// develop flags are settable / visible only during development and are constant in the PRODUCT version 537// product flags are always settable / visible 538// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 539 540// A flag must be declared with one of the following types: 541// bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 542// The type "ccstr" is an alias for "const char*" and is used 543// only in this file, because the macrology requires single-token type names. 544 545// Note: Diagnostic options not meant for VM tuning or for product modes. 546// They are to be used for VM quality assurance or field diagnosis 547// of VM bugs. They are hidden so that users will not be encouraged to 548// try them as if they were VM ordinary execution options. However, they 549// are available in the product version of the VM. Under instruction 550// from support engineers, VM customers can turn them on to collect 551// diagnostic information about VM problems. To use a VM diagnostic 552// option, you must first specify +UnlockDiagnosticVMOptions. 553// (This master switch also affects the behavior of -Xprintflags.) 554// 555// experimental flags are in support of features that are not 556// part of the officially supported product, but are available 557// for experimenting with. They could, for example, be performance 558// features that may not have undergone full or rigorous QA, but which may 559// help performance in some cases and released for experimentation 560// by the community of users and developers. This flag also allows one to 561// be able to build a fully supported product that nonetheless also 562// ships with some unsupported, lightly tested, experimental features. 563// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 564// UnlockExperimentalVMOptions flag, which allows the control and 565// modification of the experimental flags. 566// 567// Nota bene: neither diagnostic nor experimental options should be used casually, 568// and they are not supported on production loads, except under explicit 569// direction from support engineers. 570// 571// manageable flags are writeable external product flags. 572// They are dynamically writeable through the JDK management interface 573// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 574// These flags are external exported interface (see CCC). The list of 575// manageable flags can be queried programmatically through the management 576// interface. 577// 578// A flag can be made as "manageable" only if 579// - the flag is defined in a CCC as an external exported interface. 580// - the VM implementation supports dynamic setting of the flag. 581// This implies that the VM must *always* query the flag variable 582// and not reuse state related to the flag state at any given time. 583// - you want the flag to be queried programmatically by the customers. 584// 585// product_rw flags are writeable internal product flags. 586// They are like "manageable" flags but for internal/private use. 587// The list of product_rw flags are internal/private flags which 588// may be changed/removed in a future release. It can be set 589// through the management interface to get/set value 590// when the name of flag is supplied. 591// 592// A flag can be made as "product_rw" only if 593// - the VM implementation supports dynamic setting of the flag. 594// This implies that the VM must *always* query the flag variable 595// and not reuse state related to the flag state at any given time. 596// 597// Note that when there is a need to support develop flags to be writeable, 598// it can be done in the same way as product_rw. 599// 600// range is a macro that will expand to min and max arguments for range 601// checking code if provided - see commandLineFlagRangeList.hpp 602// 603// constraint is a macro that will expand to custom function call 604// for constraint checking if provided - see commandLineFlagConstraintList.hpp 605// 606 607#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 608 \ 609 lp64_product(bool, UseCompressedOops, false, \ 610 "Use 32-bit object references in 64-bit VM. " \ 611 "lp64_product means flag is always constant in 32 bit VM") \ 612 \ 613 lp64_product(bool, UseCompressedClassPointers, false, \ 614 "Use 32-bit class pointers in 64-bit VM. " \ 615 "lp64_product means flag is always constant in 32 bit VM") \ 616 \ 617 notproduct(bool, CheckCompressedOops, true, \ 618 "Generate checks in encoding/decoding code in debug VM") \ 619 \ 620 product_pd(size_t, HeapBaseMinAddress, \ 621 "OS specific low limit for heap base address") \ 622 \ 623 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 624 "Heap allocation steps through preferred address regions to find" \ 625 " where it can allocate the heap. Number of steps to take per " \ 626 "region.") \ 627 range(1, max_uintx) \ 628 \ 629 diagnostic(bool, PrintCompressedOopsMode, false, \ 630 "Print compressed oops base address and encoding mode") \ 631 \ 632 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 633 "Default object alignment in bytes, 8 is minimum") \ 634 range(8, 256) \ 635 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 636 \ 637 product(bool, AssumeMP, false, \ 638 "Instruct the VM to assume multiple processors are available") \ 639 \ 640 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 641 /* removal testing. It was supposed to be removed before FCS but has */ \ 642 /* been re-added (see 6401008) */ \ 643 product_pd(bool, UseMembar, \ 644 "(Unstable) Issues membars on thread state transitions") \ 645 \ 646 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 647 "Clean the chunk pool asynchronously") \ 648 \ 649 experimental(bool, AlwaysSafeConstructors, false, \ 650 "Force safe construction, as if all fields are final.") \ 651 \ 652 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 653 "Enable normal processing of flags relating to field diagnostics")\ 654 \ 655 experimental(bool, UnlockExperimentalVMOptions, false, \ 656 "Enable normal processing of flags relating to experimental " \ 657 "features") \ 658 \ 659 product(bool, JavaMonitorsInStackTrace, true, \ 660 "Print information about Java monitor locks when the stacks are" \ 661 "dumped") \ 662 \ 663 product_pd(bool, UseLargePages, \ 664 "Use large page memory") \ 665 \ 666 product_pd(bool, UseLargePagesIndividualAllocation, \ 667 "Allocate large pages individually for better affinity") \ 668 \ 669 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 670 "Fail large pages individual allocation") \ 671 \ 672 product(bool, UseLargePagesInMetaspace, false, \ 673 "Use large page memory in metaspace. " \ 674 "Only used if UseLargePages is enabled.") \ 675 \ 676 develop(bool, TracePageSizes, false, \ 677 "Trace page size selection and usage") \ 678 \ 679 product(bool, UseNUMA, false, \ 680 "Use NUMA if available") \ 681 \ 682 product(bool, UseNUMAInterleaving, false, \ 683 "Interleave memory across NUMA nodes if available") \ 684 \ 685 product(size_t, NUMAInterleaveGranularity, 2*M, \ 686 "Granularity to use for NUMA interleaving on Windows OS") \ 687 \ 688 product(bool, ForceNUMA, false, \ 689 "Force NUMA optimizations on single-node/UMA systems") \ 690 \ 691 product(uintx, NUMAChunkResizeWeight, 20, \ 692 "Percentage (0-100) used to weight the current sample when " \ 693 "computing exponentially decaying average for " \ 694 "AdaptiveNUMAChunkSizing") \ 695 range(0, 100) \ 696 \ 697 product(size_t, NUMASpaceResizeRate, 1*G, \ 698 "Do not reallocate more than this amount per collection") \ 699 \ 700 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 701 "Enable adaptive chunk sizing for NUMA") \ 702 \ 703 product(bool, NUMAStats, false, \ 704 "Print NUMA stats in detailed heap information") \ 705 \ 706 product(uintx, NUMAPageScanRate, 256, \ 707 "Maximum number of pages to include in the page scan procedure") \ 708 \ 709 product_pd(bool, NeedsDeoptSuspend, \ 710 "True for register window machines (sparc/ia64)") \ 711 \ 712 product(intx, UseSSE, 99, \ 713 "Highest supported SSE instructions set on x86/x64") \ 714 range(0, 99) \ 715 \ 716 product(bool, UseAES, false, \ 717 "Control whether AES instructions can be used on x86/x64") \ 718 \ 719 product(bool, UseSHA, false, \ 720 "Control whether SHA instructions can be used " \ 721 "on SPARC and on ARM") \ 722 \ 723 product(bool, UseGHASHIntrinsics, false, \ 724 "Use intrinsics for GHASH versions of crypto") \ 725 \ 726 product(size_t, LargePageSizeInBytes, 0, \ 727 "Large page size (0 to let VM choose the page size)") \ 728 \ 729 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 730 "Use large pages if maximum heap is at least this big") \ 731 \ 732 product(bool, ForceTimeHighResolution, false, \ 733 "Using high time resolution (for Win32 only)") \ 734 \ 735 develop(bool, TraceItables, false, \ 736 "Trace initialization and use of itables") \ 737 \ 738 develop(bool, TracePcPatching, false, \ 739 "Trace usage of frame::patch_pc") \ 740 \ 741 develop(bool, TraceJumps, false, \ 742 "Trace assembly jumps in thread ring buffer") \ 743 \ 744 develop(bool, TraceRelocator, false, \ 745 "Trace the bytecode relocator") \ 746 \ 747 develop(bool, TraceLongCompiles, false, \ 748 "Print out every time compilation is longer than " \ 749 "a given threshold") \ 750 \ 751 develop(bool, SafepointALot, false, \ 752 "Generate a lot of safepoints. This works with " \ 753 "GuaranteedSafepointInterval") \ 754 \ 755 product_pd(bool, BackgroundCompilation, \ 756 "A thread requesting compilation is not blocked during " \ 757 "compilation") \ 758 \ 759 product(bool, PrintVMQWaitTime, false, \ 760 "Print out the waiting time in VM operation queue") \ 761 \ 762 develop(bool, TraceOopMapGeneration, false, \ 763 "Show OopMapGeneration") \ 764 \ 765 product(bool, MethodFlushing, true, \ 766 "Reclamation of zombie and not-entrant methods") \ 767 \ 768 develop(bool, VerifyStack, false, \ 769 "Verify stack of each thread when it is entering a runtime call") \ 770 \ 771 diagnostic(bool, ForceUnreachable, false, \ 772 "Make all non code cache addresses to be unreachable by " \ 773 "forcing use of 64bit literal fixups") \ 774 \ 775 notproduct(bool, StressDerivedPointers, false, \ 776 "Force scavenge when a derived pointer is detected on stack " \ 777 "after rtm call") \ 778 \ 779 develop(bool, TraceDerivedPointers, false, \ 780 "Trace traversal of derived pointers on stack") \ 781 \ 782 notproduct(bool, TraceCodeBlobStacks, false, \ 783 "Trace stack-walk of codeblobs") \ 784 \ 785 product(bool, PrintJNIResolving, false, \ 786 "Used to implement -v:jni") \ 787 \ 788 notproduct(bool, PrintRewrites, false, \ 789 "Print methods that are being rewritten") \ 790 \ 791 product(bool, UseInlineCaches, true, \ 792 "Use Inline Caches for virtual calls ") \ 793 \ 794 develop(bool, InlineArrayCopy, true, \ 795 "Inline arraycopy native that is known to be part of " \ 796 "base library DLL") \ 797 \ 798 develop(bool, InlineObjectHash, true, \ 799 "Inline Object::hashCode() native that is known to be part " \ 800 "of base library DLL") \ 801 \ 802 develop(bool, InlineNatives, true, \ 803 "Inline natives that are known to be part of base library DLL") \ 804 \ 805 develop(bool, InlineMathNatives, true, \ 806 "Inline SinD, CosD, etc.") \ 807 \ 808 develop(bool, InlineClassNatives, true, \ 809 "Inline Class.isInstance, etc") \ 810 \ 811 develop(bool, InlineThreadNatives, true, \ 812 "Inline Thread.currentThread, etc") \ 813 \ 814 develop(bool, InlineUnsafeOps, true, \ 815 "Inline memory ops (native methods) from Unsafe") \ 816 \ 817 product(bool, CriticalJNINatives, true, \ 818 "Check for critical JNI entry points") \ 819 \ 820 notproduct(bool, StressCriticalJNINatives, false, \ 821 "Exercise register saving code in critical natives") \ 822 \ 823 product(bool, UseSSE42Intrinsics, false, \ 824 "SSE4.2 versions of intrinsics") \ 825 \ 826 product(bool, UseAESIntrinsics, false, \ 827 "Use intrinsics for AES versions of crypto") \ 828 \ 829 product(bool, UseSHA1Intrinsics, false, \ 830 "Use intrinsics for SHA-1 crypto hash function. " \ 831 "Requires that UseSHA is enabled.") \ 832 \ 833 product(bool, UseSHA256Intrinsics, false, \ 834 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 835 "Requires that UseSHA is enabled.") \ 836 \ 837 product(bool, UseSHA512Intrinsics, false, \ 838 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 839 "Requires that UseSHA is enabled.") \ 840 \ 841 product(bool, UseCRC32Intrinsics, false, \ 842 "use intrinsics for java.util.zip.CRC32") \ 843 \ 844 product(bool, UseCRC32CIntrinsics, false, \ 845 "use intrinsics for java.util.zip.CRC32C") \ 846 \ 847 product(bool, UseAdler32Intrinsics, false, \ 848 "use intrinsics for java.util.zip.Adler32") \ 849 \ 850 diagnostic(ccstrlist, DisableIntrinsic, "", \ 851 "do not expand intrinsics whose (internal) names appear here") \ 852 \ 853 develop(bool, TraceCallFixup, false, \ 854 "Trace all call fixups") \ 855 \ 856 develop(bool, DeoptimizeALot, false, \ 857 "Deoptimize at every exit from the runtime system") \ 858 \ 859 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 860 "A comma separated list of bcis to deoptimize at") \ 861 \ 862 product(bool, DeoptimizeRandom, false, \ 863 "Deoptimize random frames on random exit from the runtime system")\ 864 \ 865 notproduct(bool, ZombieALot, false, \ 866 "Create zombies (non-entrant) at exit from the runtime system") \ 867 \ 868 product(bool, UnlinkSymbolsALot, false, \ 869 "Unlink unreferenced symbols from the symbol table at safepoints")\ 870 \ 871 notproduct(bool, WalkStackALot, false, \ 872 "Trace stack (no print) at every exit from the runtime system") \ 873 \ 874 product(bool, Debugging, false, \ 875 "Set when executing debug methods in debug.cpp " \ 876 "(to prevent triggering assertions)") \ 877 \ 878 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 879 "Enable strict checks that safepoints cannot happen for threads " \ 880 "that use No_Safepoint_Verifier") \ 881 \ 882 notproduct(bool, VerifyLastFrame, false, \ 883 "Verify oops on last frame on entry to VM") \ 884 \ 885 develop(bool, TraceHandleAllocation, false, \ 886 "Print out warnings when suspiciously many handles are allocated")\ 887 \ 888 product(bool, FailOverToOldVerifier, true, \ 889 "Fail over to old verifier when split verifier fails") \ 890 \ 891 develop(bool, ShowSafepointMsgs, false, \ 892 "Show message about safepoint synchronization") \ 893 \ 894 product(bool, SafepointTimeout, false, \ 895 "Time out and warn or fail after SafepointTimeoutDelay " \ 896 "milliseconds if failed to reach safepoint") \ 897 \ 898 develop(bool, DieOnSafepointTimeout, false, \ 899 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 900 \ 901 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 902 /* typically, at most a few retries are needed */ \ 903 product(intx, SuspendRetryCount, 50, \ 904 "Maximum retry count for an external suspend request") \ 905 range(0, max_intx) \ 906 \ 907 product(intx, SuspendRetryDelay, 5, \ 908 "Milliseconds to delay per retry (* current_retry_count)") \ 909 range(0, max_intx) \ 910 \ 911 product(bool, AssertOnSuspendWaitFailure, false, \ 912 "Assert/Guarantee on external suspend wait failure") \ 913 \ 914 product(bool, TraceSuspendWaitFailures, false, \ 915 "Trace external suspend wait failures") \ 916 \ 917 product(bool, MaxFDLimit, true, \ 918 "Bump the number of file descriptors to maximum in Solaris") \ 919 \ 920 diagnostic(bool, LogEvents, true, \ 921 "Enable the various ring buffer event logs") \ 922 \ 923 diagnostic(uintx, LogEventsBufferEntries, 10, \ 924 "Number of ring buffer event logs") \ 925 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 926 \ 927 product(bool, BytecodeVerificationRemote, true, \ 928 "Enable the Java bytecode verifier for remote classes") \ 929 \ 930 product(bool, BytecodeVerificationLocal, false, \ 931 "Enable the Java bytecode verifier for local classes") \ 932 \ 933 develop(bool, ForceFloatExceptions, trueInDebug, \ 934 "Force exceptions on FP stack under/overflow") \ 935 \ 936 develop(bool, VerifyStackAtCalls, false, \ 937 "Verify that the stack pointer is unchanged after calls") \ 938 \ 939 develop(bool, TraceJavaAssertions, false, \ 940 "Trace java language assertions") \ 941 \ 942 notproduct(bool, CheckAssertionStatusDirectives, false, \ 943 "Temporary - see javaClasses.cpp") \ 944 \ 945 notproduct(bool, PrintMallocFree, false, \ 946 "Trace calls to C heap malloc/free allocation") \ 947 \ 948 product(bool, PrintOopAddress, false, \ 949 "Always print the location of the oop") \ 950 \ 951 notproduct(bool, VerifyCodeCache, false, \ 952 "Verify code cache on memory allocation/deallocation") \ 953 \ 954 develop(bool, UseMallocOnly, false, \ 955 "Use only malloc/free for allocation (no resource area/arena)") \ 956 \ 957 develop(bool, PrintMalloc, false, \ 958 "Print all malloc/free calls") \ 959 \ 960 develop(bool, PrintMallocStatistics, false, \ 961 "Print malloc/free statistics") \ 962 \ 963 develop(bool, ZapResourceArea, trueInDebug, \ 964 "Zap freed resource/arena space with 0xABABABAB") \ 965 \ 966 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 967 "Zap freed VM handle space with 0xBCBCBCBC") \ 968 \ 969 develop(bool, ZapJNIHandleArea, trueInDebug, \ 970 "Zap freed JNI handle space with 0xFEFEFEFE") \ 971 \ 972 notproduct(bool, ZapStackSegments, trueInDebug, \ 973 "Zap allocated/freed stack segments with 0xFADFADED") \ 974 \ 975 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 976 "Zap unused heap space with 0xBAADBABE") \ 977 \ 978 develop(bool, TraceZapUnusedHeapArea, false, \ 979 "Trace zapping of unused heap space") \ 980 \ 981 develop(bool, CheckZapUnusedHeapArea, false, \ 982 "Check zapping of unused heap space") \ 983 \ 984 develop(bool, ZapFillerObjects, trueInDebug, \ 985 "Zap filler objects with 0xDEAFBABE") \ 986 \ 987 develop(bool, PrintVMMessages, true, \ 988 "Print VM messages on console") \ 989 \ 990 product(bool, PrintGCApplicationConcurrentTime, false, \ 991 "Print the time the application has been running") \ 992 \ 993 product(bool, PrintGCApplicationStoppedTime, false, \ 994 "Print the time the application has been stopped") \ 995 \ 996 diagnostic(bool, VerboseVerification, false, \ 997 "Display detailed verification details") \ 998 \ 999 notproduct(uintx, ErrorHandlerTest, 0, \ 1000 "If > 0, provokes an error after VM initialization; the value " \ 1001 "determines which error to provoke. See test_error_handler() " \ 1002 "in debug.cpp.") \ 1003 \ 1004 notproduct(uintx, TestCrashInErrorHandler, 0, \ 1005 "If > 0, provokes an error inside VM error handler (a secondary " \ 1006 "crash). see test_error_handler() in debug.cpp.") \ 1007 \ 1008 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1009 "If true, tests SafeFetch inside error handler.") \ 1010 \ 1011 develop(bool, Verbose, false, \ 1012 "Print additional debugging information from other modes") \ 1013 \ 1014 develop(bool, PrintMiscellaneous, false, \ 1015 "Print uncategorized debugging information (requires +Verbose)") \ 1016 \ 1017 develop(bool, WizardMode, false, \ 1018 "Print much more debugging information") \ 1019 \ 1020 product(bool, ShowMessageBoxOnError, false, \ 1021 "Keep process alive on VM fatal error") \ 1022 \ 1023 product(bool, CreateCoredumpOnCrash, true, \ 1024 "Create core/mini dump on VM fatal error") \ 1025 \ 1026 product(uintx, ErrorLogTimeout, 2 * 60, \ 1027 "Timeout, in seconds, to limit the time spent on writing an " \ 1028 "error log in case of a crash.") \ 1029 \ 1030 product_pd(bool, UseOSErrorReporting, \ 1031 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1032 \ 1033 product(bool, SuppressFatalErrorMessage, false, \ 1034 "Report NO fatal error message (avoid deadlock)") \ 1035 \ 1036 product(ccstrlist, OnError, "", \ 1037 "Run user-defined commands on fatal error; see VMError.cpp " \ 1038 "for examples") \ 1039 \ 1040 product(ccstrlist, OnOutOfMemoryError, "", \ 1041 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1042 \ 1043 manageable(bool, HeapDumpBeforeFullGC, false, \ 1044 "Dump heap to file before any major stop-the-world GC") \ 1045 \ 1046 manageable(bool, HeapDumpAfterFullGC, false, \ 1047 "Dump heap to file after any major stop-the-world GC") \ 1048 \ 1049 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1050 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1051 \ 1052 manageable(ccstr, HeapDumpPath, NULL, \ 1053 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1054 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1055 "in the working directory)") \ 1056 \ 1057 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1058 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1059 "when the heap usage is larger than this") \ 1060 \ 1061 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1062 "Approximate segment size when generating a segmented heap dump") \ 1063 \ 1064 develop(bool, BreakAtWarning, false, \ 1065 "Execute breakpoint upon encountering VM warning") \ 1066 \ 1067 develop(bool, TraceVMOperation, false, \ 1068 "Trace VM operations") \ 1069 \ 1070 develop(bool, UseFakeTimers, false, \ 1071 "Tell whether the VM should use system time or a fake timer") \ 1072 \ 1073 product(ccstr, NativeMemoryTracking, "off", \ 1074 "Native memory tracking options") \ 1075 \ 1076 diagnostic(bool, PrintNMTStatistics, false, \ 1077 "Print native memory tracking summary data if it is on") \ 1078 \ 1079 diagnostic(bool, LogCompilation, false, \ 1080 "Log compilation activity in detail to LogFile") \ 1081 \ 1082 product(bool, PrintCompilation, false, \ 1083 "Print compilations") \ 1084 \ 1085 diagnostic(bool, TraceNMethodInstalls, false, \ 1086 "Trace nmethod installation") \ 1087 \ 1088 diagnostic(intx, ScavengeRootsInCode, 2, \ 1089 "0: do not allow scavengable oops in the code cache; " \ 1090 "1: allow scavenging from the code cache; " \ 1091 "2: emit as many constants as the compiler can see") \ 1092 range(0, 2) \ 1093 \ 1094 product(bool, AlwaysRestoreFPU, false, \ 1095 "Restore the FPU control word after every JNI call (expensive)") \ 1096 \ 1097 diagnostic(bool, PrintCompilation2, false, \ 1098 "Print additional statistics per compilation") \ 1099 \ 1100 diagnostic(bool, PrintAdapterHandlers, false, \ 1101 "Print code generated for i2c/c2i adapters") \ 1102 \ 1103 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1104 "Verify that i2c/c2i adapters are called properly") \ 1105 \ 1106 develop(bool, VerifyAdapterSharing, false, \ 1107 "Verify that the code for shared adapters is the equivalent") \ 1108 \ 1109 diagnostic(bool, PrintAssembly, false, \ 1110 "Print assembly code (using external disassembler.so)") \ 1111 \ 1112 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1113 "Print options string passed to disassembler.so") \ 1114 \ 1115 notproduct(bool, PrintNMethodStatistics, false, \ 1116 "Print a summary statistic for the generated nmethods") \ 1117 \ 1118 diagnostic(bool, PrintNMethods, false, \ 1119 "Print assembly code for nmethods when generated") \ 1120 \ 1121 diagnostic(intx, PrintNMethodsAtLevel, -1, \ 1122 "Only print code for nmethods at the given compilation level") \ 1123 \ 1124 diagnostic(bool, PrintNativeNMethods, false, \ 1125 "Print assembly code for native nmethods when generated") \ 1126 \ 1127 develop(bool, PrintDebugInfo, false, \ 1128 "Print debug information for all nmethods when generated") \ 1129 \ 1130 develop(bool, PrintRelocations, false, \ 1131 "Print relocation information for all nmethods when generated") \ 1132 \ 1133 develop(bool, PrintDependencies, false, \ 1134 "Print dependency information for all nmethods when generated") \ 1135 \ 1136 develop(bool, PrintExceptionHandlers, false, \ 1137 "Print exception handler tables for all nmethods when generated") \ 1138 \ 1139 develop(bool, StressCompiledExceptionHandlers, false, \ 1140 "Exercise compiled exception handlers") \ 1141 \ 1142 develop(bool, InterceptOSException, false, \ 1143 "Start debugger when an implicit OS (e.g. NULL) " \ 1144 "exception happens") \ 1145 \ 1146 product(bool, PrintCodeCache, false, \ 1147 "Print the code cache memory usage when exiting") \ 1148 \ 1149 develop(bool, PrintCodeCache2, false, \ 1150 "Print detailed usage information on the code cache when exiting")\ 1151 \ 1152 product(bool, PrintCodeCacheOnCompilation, false, \ 1153 "Print the code cache memory usage each time a method is " \ 1154 "compiled") \ 1155 \ 1156 diagnostic(bool, PrintStubCode, false, \ 1157 "Print generated stub code") \ 1158 \ 1159 product(bool, StackTraceInThrowable, true, \ 1160 "Collect backtrace in throwable when exception happens") \ 1161 \ 1162 product(bool, OmitStackTraceInFastThrow, true, \ 1163 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1164 \ 1165 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1166 "Print bytecode statistics when dumping profiler output") \ 1167 \ 1168 product(bool, ProfilerRecordPC, false, \ 1169 "Collect ticks for each 16 byte interval of compiled code") \ 1170 \ 1171 product(bool, ProfileVM, false, \ 1172 "Profile ticks that fall within VM (either in the VM Thread " \ 1173 "or VM code called through stubs)") \ 1174 \ 1175 product(bool, ProfileIntervals, false, \ 1176 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1177 \ 1178 notproduct(bool, ProfilerCheckIntervals, false, \ 1179 "Collect and print information on spacing of profiler ticks") \ 1180 \ 1181 product(bool, PrintWarnings, true, \ 1182 "Print JVM warnings to output stream") \ 1183 \ 1184 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1185 "Print warnings for stalled SpinLocks") \ 1186 \ 1187 product(bool, RegisterFinalizersAtInit, true, \ 1188 "Register finalizable objects at end of Object.<init> or " \ 1189 "after allocation") \ 1190 \ 1191 develop(bool, RegisterReferences, true, \ 1192 "Tell whether the VM should register soft/weak/final/phantom " \ 1193 "references") \ 1194 \ 1195 develop(bool, IgnoreRewrites, false, \ 1196 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1197 "This is unsafe!") \ 1198 \ 1199 develop(bool, PrintCodeCacheExtension, false, \ 1200 "Print extension of code cache") \ 1201 \ 1202 develop(bool, UsePrivilegedStack, true, \ 1203 "Enable the security JVM functions") \ 1204 \ 1205 develop(bool, ProtectionDomainVerification, true, \ 1206 "Verify protection domain before resolution in system dictionary")\ 1207 \ 1208 product(bool, ClassUnloading, true, \ 1209 "Do unloading of classes") \ 1210 \ 1211 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1212 "Do unloading of classes with a concurrent marking cycle") \ 1213 \ 1214 develop(bool, DisableStartThread, false, \ 1215 "Disable starting of additional Java threads " \ 1216 "(for debugging only)") \ 1217 \ 1218 develop(bool, MemProfiling, false, \ 1219 "Write memory usage profiling to log file") \ 1220 \ 1221 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1222 "Print the system dictionary at exit") \ 1223 \ 1224 experimental(intx, PredictedLoadedClassCount, 0, \ 1225 "Experimental: Tune loaded class cache starting size") \ 1226 \ 1227 diagnostic(bool, UnsyncloadClass, false, \ 1228 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1229 "class loader must call VM synchronized for findClass " \ 1230 "and defineClass.") \ 1231 \ 1232 product(bool, AlwaysLockClassLoader, false, \ 1233 "Require the VM to acquire the class loader lock before calling " \ 1234 "loadClass() even for class loaders registering " \ 1235 "as parallel capable") \ 1236 \ 1237 product(bool, AllowParallelDefineClass, false, \ 1238 "Allow parallel defineClass requests for class loaders " \ 1239 "registering as parallel capable") \ 1240 \ 1241 product(bool, MustCallLoadClassInternal, false, \ 1242 "Call loadClassInternal() rather than loadClass()") \ 1243 \ 1244 product_pd(bool, DontYieldALot, \ 1245 "Throw away obvious excess yield calls") \ 1246 \ 1247 product_pd(bool, ConvertSleepToYield, \ 1248 "Convert sleep(0) to thread yield " \ 1249 "(may be off for Solaris to improve GUI)") \ 1250 \ 1251 product(bool, ConvertYieldToSleep, false, \ 1252 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1253 "behavior") \ 1254 \ 1255 develop(bool, UseDetachedThreads, true, \ 1256 "Use detached threads that are recycled upon termination " \ 1257 "(for Solaris only)") \ 1258 \ 1259 product(bool, UseLWPSynchronization, true, \ 1260 "Use LWP-based instead of libthread-based synchronization " \ 1261 "(SPARC only)") \ 1262 \ 1263 experimental(ccstr, SyncKnobs, NULL, \ 1264 "(Unstable) Various monitor synchronization tunables") \ 1265 \ 1266 experimental(intx, EmitSync, 0, \ 1267 "(Unsafe, Unstable) " \ 1268 "Control emission of inline sync fast-path code") \ 1269 \ 1270 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1271 range(0, max_jint) \ 1272 \ 1273 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1274 \ 1275 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1276 "Experimental Sync flags") \ 1277 \ 1278 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1279 \ 1280 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1281 \ 1282 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1283 \ 1284 experimental(intx, hashCode, 5, \ 1285 "(Unstable) select hashCode generation algorithm") \ 1286 \ 1287 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1288 "(Unstable, Linux-specific) " \ 1289 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1290 \ 1291 product(bool, FilterSpuriousWakeups, true, \ 1292 "When true prevents OS-level spurious, or premature, wakeups " \ 1293 "from Object.wait (Ignored for Windows)") \ 1294 \ 1295 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1296 \ 1297 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1298 \ 1299 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1300 \ 1301 develop(bool, UsePthreads, false, \ 1302 "Use pthread-based instead of libthread-based synchronization " \ 1303 "(SPARC only)") \ 1304 \ 1305 product(bool, ReduceSignalUsage, false, \ 1306 "Reduce the use of OS signals in Java and/or the VM") \ 1307 \ 1308 develop_pd(bool, ShareVtableStubs, \ 1309 "Share vtable stubs (smaller code but worse branch prediction") \ 1310 \ 1311 develop(bool, LoadLineNumberTables, true, \ 1312 "Tell whether the class file parser loads line number tables") \ 1313 \ 1314 develop(bool, LoadLocalVariableTables, true, \ 1315 "Tell whether the class file parser loads local variable tables") \ 1316 \ 1317 develop(bool, LoadLocalVariableTypeTables, true, \ 1318 "Tell whether the class file parser loads local variable type" \ 1319 "tables") \ 1320 \ 1321 product(bool, AllowUserSignalHandlers, false, \ 1322 "Do not complain if the application installs signal handlers " \ 1323 "(Solaris & Linux only)") \ 1324 \ 1325 product(bool, UseSignalChaining, true, \ 1326 "Use signal-chaining to invoke signal handlers installed " \ 1327 "by the application (Solaris & Linux only)") \ 1328 \ 1329 product(bool, UseAltSigs, false, \ 1330 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1331 "internal signals (Solaris only)") \ 1332 \ 1333 product(bool, AllowJNIEnvProxy, false, \ 1334 "Allow JNIEnv proxies for jdbx") \ 1335 \ 1336 product(bool, RestoreMXCSROnJNICalls, false, \ 1337 "Restore MXCSR when returning from JNI calls") \ 1338 \ 1339 product(bool, CheckJNICalls, false, \ 1340 "Verify all arguments to JNI calls") \ 1341 \ 1342 product(bool, CheckEndorsedAndExtDirs, false, \ 1343 "Verify the endorsed and extension directories are not used") \ 1344 \ 1345 product(bool, UseFastJNIAccessors, true, \ 1346 "Use optimized versions of Get<Primitive>Field") \ 1347 \ 1348 product(intx, MaxJNILocalCapacity, 65536, \ 1349 "Maximum allowable local JNI handle capacity to " \ 1350 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1351 "where <= 0 is unlimited, default: 65536") \ 1352 range(min_intx, max_intx) \ 1353 \ 1354 product(bool, EagerXrunInit, false, \ 1355 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1356 "but not all -Xrun libraries may support the state of the VM " \ 1357 "at this time") \ 1358 \ 1359 product(bool, PreserveAllAnnotations, false, \ 1360 "Preserve RuntimeInvisibleAnnotations as well " \ 1361 "as RuntimeVisibleAnnotations") \ 1362 \ 1363 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1364 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1365 \ 1366 product(bool, UseXMMForArrayCopy, false, \ 1367 "Use SSE2 MOVQ instruction for Arraycopy") \ 1368 \ 1369 product(intx, FieldsAllocationStyle, 1, \ 1370 "0 - type based with oops first, " \ 1371 "1 - with oops last, " \ 1372 "2 - oops in super and sub classes are together") \ 1373 range(0, 2) \ 1374 \ 1375 product(bool, CompactFields, true, \ 1376 "Allocate nonstatic fields in gaps between previous fields") \ 1377 \ 1378 notproduct(bool, PrintFieldLayout, false, \ 1379 "Print field layout for each class") \ 1380 \ 1381 /* Need to limit the extent of the padding to reasonable size. */\ 1382 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1383 /* aggressive prefetching, while still leaving the room for segregating */\ 1384 /* among the distinct pages. */\ 1385 product(intx, ContendedPaddingWidth, 128, \ 1386 "How many bytes to pad the fields/classes marked @Contended with")\ 1387 range(0, 8192) \ 1388 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1389 \ 1390 product(bool, EnableContended, true, \ 1391 "Enable @Contended annotation support") \ 1392 \ 1393 product(bool, RestrictContended, true, \ 1394 "Restrict @Contended to trusted classes") \ 1395 \ 1396 product(bool, UseBiasedLocking, true, \ 1397 "Enable biased locking in JVM") \ 1398 \ 1399 product(intx, BiasedLockingStartupDelay, 4000, \ 1400 "Number of milliseconds to wait before enabling biased locking") \ 1401 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1402 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1403 \ 1404 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1405 "Print statistics of biased locking in JVM") \ 1406 \ 1407 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1408 "Threshold of number of revocations per type to try to " \ 1409 "rebias all objects in the heap of that type") \ 1410 range(0, max_intx) \ 1411 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1412 \ 1413 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1414 "Threshold of number of revocations per type to permanently " \ 1415 "revoke biases of all objects in the heap of that type") \ 1416 range(0, max_intx) \ 1417 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1418 \ 1419 product(intx, BiasedLockingDecayTime, 25000, \ 1420 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1421 "type after previous bulk rebias") \ 1422 range(500, max_intx) \ 1423 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1424 \ 1425 /* tracing */ \ 1426 \ 1427 notproduct(bool, TraceRuntimeCalls, false, \ 1428 "Trace run-time calls") \ 1429 \ 1430 develop(bool, TraceJNICalls, false, \ 1431 "Trace JNI calls") \ 1432 \ 1433 develop(bool, StressRewriter, false, \ 1434 "Stress linktime bytecode rewriting") \ 1435 \ 1436 notproduct(bool, TraceJVMCalls, false, \ 1437 "Trace JVM calls") \ 1438 \ 1439 product(ccstr, TraceJVMTI, NULL, \ 1440 "Trace flags for JVMTI functions and events") \ 1441 \ 1442 /* This option can change an EMCP method into an obsolete method. */ \ 1443 /* This can affect tests that except specific methods to be EMCP. */ \ 1444 /* This option should be used with caution. */ \ 1445 product(bool, StressLdcRewrite, false, \ 1446 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1447 \ 1448 product(uintx, TraceRedefineClasses, 0, \ 1449 "Trace level for JVMTI RedefineClasses") \ 1450 range(0, 0xFFFFFFFF) \ 1451 \ 1452 /* change to false by default sometime after Mustang */ \ 1453 product(bool, VerifyMergedCPBytecodes, true, \ 1454 "Verify bytecodes after RedefineClasses constant pool merging") \ 1455 \ 1456 develop(bool, TraceJNIHandleAllocation, false, \ 1457 "Trace allocation/deallocation of JNI handle blocks") \ 1458 \ 1459 develop(bool, TraceBytecodes, false, \ 1460 "Trace bytecode execution") \ 1461 \ 1462 develop(bool, TraceClassInitialization, false, \ 1463 "Trace class initialization") \ 1464 \ 1465 product(bool, TraceExceptions, false, \ 1466 "Trace exceptions") \ 1467 \ 1468 develop(bool, TraceICs, false, \ 1469 "Trace inline cache changes") \ 1470 \ 1471 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1472 "Trace method invocation counter overflow") \ 1473 \ 1474 develop(bool, TraceInlineCacheClearing, false, \ 1475 "Trace clearing of inline caches in nmethods") \ 1476 \ 1477 develop(bool, TraceDependencies, false, \ 1478 "Trace dependencies") \ 1479 \ 1480 develop(bool, VerifyDependencies, trueInDebug, \ 1481 "Exercise and verify the compilation dependency mechanism") \ 1482 \ 1483 develop(bool, TraceNewOopMapGeneration, false, \ 1484 "Trace OopMapGeneration") \ 1485 \ 1486 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1487 "Trace OopMapGeneration: print detailed cell states") \ 1488 \ 1489 develop(bool, TimeOopMap, false, \ 1490 "Time calls to GenerateOopMap::compute_map() in sum") \ 1491 \ 1492 develop(bool, TimeOopMap2, false, \ 1493 "Time calls to GenerateOopMap::compute_map() individually") \ 1494 \ 1495 develop(bool, TraceMonitorMismatch, false, \ 1496 "Trace monitor matching failures during OopMapGeneration") \ 1497 \ 1498 develop(bool, TraceOopMapRewrites, false, \ 1499 "Trace rewriting of method oops during oop map generation") \ 1500 \ 1501 develop(bool, TraceSafepoint, false, \ 1502 "Trace safepoint operations") \ 1503 \ 1504 develop(bool, TraceICBuffer, false, \ 1505 "Trace usage of IC buffer") \ 1506 \ 1507 develop(bool, TraceCompiledIC, false, \ 1508 "Trace changes of compiled IC") \ 1509 \ 1510 develop(bool, TraceStartupTime, false, \ 1511 "Trace setup time") \ 1512 \ 1513 develop(bool, TraceProtectionDomainVerification, false, \ 1514 "Trace protection domain verification") \ 1515 \ 1516 develop(bool, TraceClearedExceptions, false, \ 1517 "Print when an exception is forcibly cleared") \ 1518 \ 1519 product(bool, TraceClassResolution, false, \ 1520 "Trace all constant pool resolutions (for debugging)") \ 1521 \ 1522 product(bool, TraceBiasedLocking, false, \ 1523 "Trace biased locking in JVM") \ 1524 \ 1525 product(bool, TraceMonitorInflation, false, \ 1526 "Trace monitor inflation in JVM") \ 1527 \ 1528 /* gc */ \ 1529 \ 1530 product(bool, UseSerialGC, false, \ 1531 "Use the Serial garbage collector") \ 1532 \ 1533 product(bool, UseG1GC, false, \ 1534 "Use the Garbage-First garbage collector") \ 1535 \ 1536 product(bool, UseParallelGC, false, \ 1537 "Use the Parallel Scavenge garbage collector") \ 1538 \ 1539 product(bool, UseParallelOldGC, false, \ 1540 "Use the Parallel Old garbage collector") \ 1541 \ 1542 product(uintx, HeapMaximumCompactionInterval, 20, \ 1543 "How often should we maximally compact the heap (not allowing " \ 1544 "any dead space)") \ 1545 \ 1546 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1547 "The collection count for the first maximum compaction") \ 1548 \ 1549 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1550 "Use maximum compaction in the Parallel Old garbage collector " \ 1551 "for a system GC") \ 1552 \ 1553 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1554 "The mean used by the parallel compact dead wood " \ 1555 "limiter (a number between 0-100)") \ 1556 range(0, 100) \ 1557 \ 1558 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1559 "The standard deviation used by the parallel compact dead wood " \ 1560 "limiter (a number between 0-100)") \ 1561 range(0, 100) \ 1562 \ 1563 product(uint, ParallelGCThreads, 0, \ 1564 "Number of parallel threads parallel gc will use") \ 1565 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1566 \ 1567 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1568 "Use semaphore synchronization for the GC Threads, " \ 1569 "instead of synchronization based on mutexes") \ 1570 \ 1571 product(bool, UseDynamicNumberOfGCThreads, false, \ 1572 "Dynamically choose the number of parallel threads " \ 1573 "parallel gc will use") \ 1574 \ 1575 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1576 "Force dynamic selection of the number of " \ 1577 "parallel threads parallel gc will use to aid debugging") \ 1578 \ 1579 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1580 "Size of heap (bytes) per GC thread used in calculating the " \ 1581 "number of GC threads") \ 1582 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1583 \ 1584 product(bool, TraceDynamicGCThreads, false, \ 1585 "Trace the dynamic GC thread usage") \ 1586 \ 1587 product(uint, ConcGCThreads, 0, \ 1588 "Number of threads concurrent gc will use") \ 1589 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1590 \ 1591 product(uintx, GCTaskTimeStampEntries, 200, \ 1592 "Number of time stamp entries per gc worker thread") \ 1593 range(1, max_uintx) \ 1594 \ 1595 product(bool, AlwaysTenure, false, \ 1596 "Always tenure objects in eden (ParallelGC only)") \ 1597 \ 1598 product(bool, NeverTenure, false, \ 1599 "Never tenure objects in eden, may tenure on overflow " \ 1600 "(ParallelGC only)") \ 1601 \ 1602 product(bool, ScavengeBeforeFullGC, true, \ 1603 "Scavenge youngest generation before each full GC.") \ 1604 \ 1605 product(bool, UseConcMarkSweepGC, false, \ 1606 "Use Concurrent Mark-Sweep GC in the old generation") \ 1607 \ 1608 product(bool, ExplicitGCInvokesConcurrent, false, \ 1609 "A System.gc() request invokes a concurrent collection; " \ 1610 "(effective only when using concurrent collectors)") \ 1611 \ 1612 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1613 "A System.gc() request invokes a concurrent collection and " \ 1614 "also unloads classes during such a concurrent gc cycle " \ 1615 "(effective only when UseConcMarkSweepGC)") \ 1616 \ 1617 product(bool, GCLockerInvokesConcurrent, false, \ 1618 "The exit of a JNI critical section necessitating a scavenge, " \ 1619 "also kicks off a background concurrent collection") \ 1620 \ 1621 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1622 "How much the GC can expand the eden by while the GC locker " \ 1623 "is active (as a percentage)") \ 1624 range(0, 100) \ 1625 \ 1626 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1627 "Number of times to retry allocations when " \ 1628 "blocked by the GC locker") \ 1629 \ 1630 product(bool, UseCMSBestFit, true, \ 1631 "Use CMS best fit allocation strategy") \ 1632 \ 1633 product(bool, UseParNewGC, false, \ 1634 "Use parallel threads in the new generation") \ 1635 \ 1636 product(bool, PrintTaskqueue, false, \ 1637 "Print taskqueue statistics for parallel collectors") \ 1638 \ 1639 product(bool, PrintTerminationStats, false, \ 1640 "Print termination statistics for parallel collectors") \ 1641 \ 1642 product(uintx, ParallelGCBufferWastePct, 10, \ 1643 "Wasted fraction of parallel allocation buffer") \ 1644 range(0, 100) \ 1645 \ 1646 product(uintx, TargetPLABWastePct, 10, \ 1647 "Target wasted space in last buffer as percent of overall " \ 1648 "allocation") \ 1649 range(1, 100) \ 1650 \ 1651 product(uintx, PLABWeight, 75, \ 1652 "Percentage (0-100) used to weight the current sample when " \ 1653 "computing exponentially decaying average for ResizePLAB") \ 1654 range(0, 100) \ 1655 \ 1656 product(bool, ResizePLAB, true, \ 1657 "Dynamically resize (survivor space) promotion LAB's") \ 1658 \ 1659 product(bool, PrintPLAB, false, \ 1660 "Print (survivor space) promotion LAB's sizing decisions") \ 1661 \ 1662 product(intx, ParGCArrayScanChunk, 50, \ 1663 "Scan a subset of object array and push remainder, if array is " \ 1664 "bigger than this") \ 1665 range(1, max_intx) \ 1666 \ 1667 product(bool, ParGCUseLocalOverflow, false, \ 1668 "Instead of a global overflow list, use local overflow stacks") \ 1669 \ 1670 product(bool, ParGCTrimOverflow, true, \ 1671 "Eagerly trim the local overflow lists " \ 1672 "(when ParGCUseLocalOverflow)") \ 1673 \ 1674 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1675 "Simulate work queue overflow in ParNew") \ 1676 \ 1677 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1678 "An `interval' counter that determines how frequently " \ 1679 "we simulate overflow; a smaller number increases frequency") \ 1680 \ 1681 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1682 "The desired number of objects to claim from the overflow list") \ 1683 \ 1684 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1685 "The number of strides per worker thread that we divide up the " \ 1686 "card table scanning work into") \ 1687 range(1, max_uintx) \ 1688 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1689 \ 1690 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1691 "The number of cards in each chunk of the parallel chunks used " \ 1692 "during card table scanning") \ 1693 range(1, max_intx) \ 1694 \ 1695 product(uintx, OldPLABWeight, 50, \ 1696 "Percentage (0-100) used to weight the current sample when " \ 1697 "computing exponentially decaying average for resizing " \ 1698 "OldPLABSize") \ 1699 range(0, 100) \ 1700 \ 1701 product(bool, ResizeOldPLAB, true, \ 1702 "Dynamically resize (old gen) promotion LAB's") \ 1703 \ 1704 product(bool, PrintOldPLAB, false, \ 1705 "Print (old gen) promotion LAB's sizing decisions") \ 1706 \ 1707 product(size_t, CMSOldPLABMax, 1024, \ 1708 "Maximum size of CMS gen promotion LAB caches per worker " \ 1709 "per block size") \ 1710 range(1, max_uintx) \ 1711 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1712 \ 1713 product(size_t, CMSOldPLABMin, 16, \ 1714 "Minimum size of CMS gen promotion LAB caches per worker " \ 1715 "per block size") \ 1716 range(1, max_uintx) \ 1717 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1718 \ 1719 product(uintx, CMSOldPLABNumRefills, 4, \ 1720 "Nominal number of refills of CMS gen promotion LAB cache " \ 1721 "per worker per block size") \ 1722 range(1, max_uintx) \ 1723 \ 1724 product(bool, CMSOldPLABResizeQuicker, false, \ 1725 "React on-the-fly during a scavenge to a sudden " \ 1726 "change in block demand rate") \ 1727 \ 1728 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1729 "The tolerance of the phase-change detector for on-the-fly " \ 1730 "PLAB resizing during a scavenge") \ 1731 range(1, max_uintx) \ 1732 \ 1733 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1734 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1735 "during a scavenge") \ 1736 \ 1737 product(bool, AlwaysPreTouch, false, \ 1738 "Force all freshly committed pages to be pre-touched") \ 1739 \ 1740 product_pd(size_t, CMSYoungGenPerWorker, \ 1741 "The maximum size of young gen chosen by default per GC worker " \ 1742 "thread available") \ 1743 range(1, max_uintx) \ 1744 \ 1745 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1746 "Percentage (0-100) used to add conservatism when computing the " \ 1747 "duty cycle") \ 1748 range(0, 100) \ 1749 \ 1750 product(uintx, CMSExpAvgFactor, 50, \ 1751 "Percentage (0-100) used to weight the current sample when " \ 1752 "computing exponential averages for CMS statistics") \ 1753 range(0, 100) \ 1754 \ 1755 product(uintx, CMS_FLSWeight, 75, \ 1756 "Percentage (0-100) used to weight the current sample when " \ 1757 "computing exponentially decaying averages for CMS FLS " \ 1758 "statistics") \ 1759 range(0, 100) \ 1760 \ 1761 product(uintx, CMS_FLSPadding, 1, \ 1762 "The multiple of deviation from mean to use for buffering " \ 1763 "against volatility in free list demand") \ 1764 \ 1765 product(uintx, FLSCoalescePolicy, 2, \ 1766 "CMS: aggressiveness level for coalescing, increasing " \ 1767 "from 0 to 4") \ 1768 range(0, 4) \ 1769 \ 1770 product(bool, FLSAlwaysCoalesceLarge, false, \ 1771 "CMS: larger free blocks are always available for coalescing") \ 1772 \ 1773 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1774 "CMS: the smaller the percentage the greater the coalescing " \ 1775 "force") \ 1776 range(0.0, 1.0) \ 1777 \ 1778 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1779 "CMS: the factor by which to inflate estimated demand of small " \ 1780 "block sizes to prevent coalescing with an adjoining block") \ 1781 range(0.0, DBL_MAX) \ 1782 \ 1783 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1784 "CMS: the factor by which to inflate estimated demand of large " \ 1785 "block sizes to prevent coalescing with an adjoining block") \ 1786 range(0.0, DBL_MAX) \ 1787 \ 1788 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1789 "CMS: the factor by which to inflate estimated demand of small " \ 1790 "block sizes to prevent splitting to supply demand for smaller " \ 1791 "blocks") \ 1792 range(0.0, DBL_MAX) \ 1793 \ 1794 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1795 "CMS: the factor by which to inflate estimated demand of large " \ 1796 "block sizes to prevent splitting to supply demand for smaller " \ 1797 "blocks") \ 1798 range(0.0, DBL_MAX) \ 1799 \ 1800 product(bool, CMSExtrapolateSweep, false, \ 1801 "CMS: cushion for block demand during sweep") \ 1802 \ 1803 product(uintx, CMS_SweepWeight, 75, \ 1804 "Percentage (0-100) used to weight the current sample when " \ 1805 "computing exponentially decaying average for inter-sweep " \ 1806 "duration") \ 1807 range(0, 100) \ 1808 \ 1809 product(uintx, CMS_SweepPadding, 1, \ 1810 "The multiple of deviation from mean to use for buffering " \ 1811 "against volatility in inter-sweep duration") \ 1812 \ 1813 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1814 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1815 "duration exceeds this threshold in milliseconds") \ 1816 \ 1817 product(bool, CMSClassUnloadingEnabled, true, \ 1818 "Whether class unloading enabled when using CMS GC") \ 1819 \ 1820 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1821 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1822 "count for which classes may not be unloaded") \ 1823 \ 1824 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1825 "Replenish an indexed free list with this number of chunks") \ 1826 range(1, max_uintx) \ 1827 \ 1828 product(bool, CMSReplenishIntermediate, true, \ 1829 "Replenish all intermediate free-list caches") \ 1830 \ 1831 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1832 "When satisfying batched demand, split blocks from the " \ 1833 "IndexedFreeList whose size is a multiple of requested size") \ 1834 \ 1835 product(bool, CMSLoopWarn, false, \ 1836 "Warn in case of excessive CMS looping") \ 1837 \ 1838 /* where does the range max value of (max_jint - 1) come from? */ \ 1839 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1840 "Maximum size of marking stack") \ 1841 range(1, (max_jint - 1)) \ 1842 \ 1843 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1844 "Size of marking stack") \ 1845 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1846 \ 1847 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1848 "Simulate frequent marking stack / work queue overflow") \ 1849 \ 1850 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1851 "An \"interval\" counter that determines how frequently " \ 1852 "to simulate overflow; a smaller number increases frequency") \ 1853 \ 1854 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1855 "Maximum number of abortable preclean iterations, if > 0") \ 1856 \ 1857 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1858 "Maximum time in abortable preclean (in milliseconds)") \ 1859 range(0, max_intx) \ 1860 \ 1861 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1862 "Nominal minimum work per abortable preclean iteration") \ 1863 \ 1864 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1865 "Time that we sleep between iterations when not given " \ 1866 "enough work per iteration") \ 1867 range(0, max_intx) \ 1868 \ 1869 product(size_t, CMSRescanMultiple, 32, \ 1870 "Size (in cards) of CMS parallel rescan task") \ 1871 range(1, max_uintx) \ 1872 \ 1873 product(size_t, CMSConcMarkMultiple, 32, \ 1874 "Size (in cards) of CMS concurrent MT marking task") \ 1875 range(1, max_uintx) \ 1876 \ 1877 product(bool, CMSAbortSemantics, false, \ 1878 "Whether abort-on-overflow semantics is implemented") \ 1879 \ 1880 product(bool, CMSParallelInitialMarkEnabled, true, \ 1881 "Use the parallel initial mark.") \ 1882 \ 1883 product(bool, CMSParallelRemarkEnabled, true, \ 1884 "Whether parallel remark enabled (only if ParNewGC)") \ 1885 \ 1886 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1887 "Whether parallel remark of survivor space " \ 1888 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1889 \ 1890 product(bool, CMSPLABRecordAlways, true, \ 1891 "Always record survivor space PLAB boundaries (effective only " \ 1892 "if CMSParallelSurvivorRemarkEnabled)") \ 1893 \ 1894 product(bool, CMSEdenChunksRecordAlways, true, \ 1895 "Always record eden chunks used for the parallel initial mark " \ 1896 "or remark of eden") \ 1897 \ 1898 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1899 "Print the eden and the survivor chunks used for the parallel " \ 1900 "initial mark or remark of the eden/survivor spaces") \ 1901 \ 1902 product(bool, CMSConcurrentMTEnabled, true, \ 1903 "Whether multi-threaded concurrent work enabled " \ 1904 "(effective only if ParNewGC)") \ 1905 \ 1906 product(bool, CMSPrecleaningEnabled, true, \ 1907 "Whether concurrent precleaning enabled") \ 1908 \ 1909 product(uintx, CMSPrecleanIter, 3, \ 1910 "Maximum number of precleaning iteration passes") \ 1911 range(0, 9) \ 1912 \ 1913 product(uintx, CMSPrecleanDenominator, 3, \ 1914 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1915 "ratio") \ 1916 range(1, max_uintx) \ 1917 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1918 \ 1919 product(uintx, CMSPrecleanNumerator, 2, \ 1920 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1921 "ratio") \ 1922 range(0, max_uintx-1) \ 1923 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1924 \ 1925 product(bool, CMSPrecleanRefLists1, true, \ 1926 "Preclean ref lists during (initial) preclean phase") \ 1927 \ 1928 product(bool, CMSPrecleanRefLists2, false, \ 1929 "Preclean ref lists during abortable preclean phase") \ 1930 \ 1931 product(bool, CMSPrecleanSurvivors1, false, \ 1932 "Preclean survivors during (initial) preclean phase") \ 1933 \ 1934 product(bool, CMSPrecleanSurvivors2, true, \ 1935 "Preclean survivors during abortable preclean phase") \ 1936 \ 1937 product(uintx, CMSPrecleanThreshold, 1000, \ 1938 "Do not iterate again if number of dirty cards is less than this")\ 1939 range(100, max_uintx) \ 1940 \ 1941 product(bool, CMSCleanOnEnter, true, \ 1942 "Clean-on-enter optimization for reducing number of dirty cards") \ 1943 \ 1944 product(uintx, CMSRemarkVerifyVariant, 1, \ 1945 "Choose variant (1,2) of verification following remark") \ 1946 range(1, 2) \ 1947 \ 1948 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1949 "If Eden size is below this, do not try to schedule remark") \ 1950 \ 1951 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1952 "The Eden occupancy percentage (0-100) at which " \ 1953 "to try and schedule remark pause") \ 1954 range(0, 100) \ 1955 \ 1956 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1957 "Start sampling eden top at least before young gen " \ 1958 "occupancy reaches 1/<ratio> of the size at which " \ 1959 "we plan to schedule remark") \ 1960 range(1, max_uintx) \ 1961 \ 1962 product(uintx, CMSSamplingGrain, 16*K, \ 1963 "The minimum distance between eden samples for CMS (see above)") \ 1964 range(1, max_uintx) \ 1965 \ 1966 product(bool, CMSScavengeBeforeRemark, false, \ 1967 "Attempt scavenge before the CMS remark step") \ 1968 \ 1969 develop(bool, CMSTraceSweeper, false, \ 1970 "Trace some actions of the CMS sweeper") \ 1971 \ 1972 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1973 "Don't drain below this size per parallel worker/thief") \ 1974 range(1, max_juint) \ 1975 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1976 \ 1977 manageable(intx, CMSWaitDuration, 2000, \ 1978 "Time in milliseconds that CMS thread waits for young GC") \ 1979 \ 1980 develop(uintx, CMSCheckInterval, 1000, \ 1981 "Interval in milliseconds that CMS thread checks if it " \ 1982 "should start a collection cycle") \ 1983 \ 1984 product(bool, CMSYield, true, \ 1985 "Yield between steps of CMS") \ 1986 \ 1987 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1988 "Bitmap operations should process at most this many bits " \ 1989 "between yields") \ 1990 range(1, max_uintx) \ 1991 \ 1992 product(bool, CMSDumpAtPromotionFailure, false, \ 1993 "Dump useful information about the state of the CMS old " \ 1994 "generation upon a promotion failure") \ 1995 \ 1996 product(bool, CMSPrintChunksInDump, false, \ 1997 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1998 "more detailed information about the free chunks") \ 1999 \ 2000 product(bool, CMSPrintObjectsInDump, false, \ 2001 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2002 "more detailed information about the allocated objects") \ 2003 \ 2004 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 2005 "Verify that all references across the FLS boundary " \ 2006 "are to valid objects") \ 2007 \ 2008 diagnostic(bool, FLSVerifyLists, false, \ 2009 "Do lots of (expensive) FreeListSpace verification") \ 2010 \ 2011 diagnostic(bool, FLSVerifyIndexTable, false, \ 2012 "Do lots of (expensive) FLS index table verification") \ 2013 \ 2014 develop(bool, FLSVerifyDictionary, false, \ 2015 "Do lots of (expensive) FLS dictionary verification") \ 2016 \ 2017 develop(bool, VerifyBlockOffsetArray, false, \ 2018 "Do (expensive) block offset array verification") \ 2019 \ 2020 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2021 "Maintain _unallocated_block in BlockOffsetArray " \ 2022 "(currently applicable only to CMS collector)") \ 2023 \ 2024 develop(bool, TraceCMSState, false, \ 2025 "Trace the state of the CMS collection") \ 2026 \ 2027 product(intx, RefDiscoveryPolicy, 0, \ 2028 "Select type of reference discovery policy: " \ 2029 "reference-based(0) or referent-based(1)") \ 2030 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2031 ReferenceProcessor::DiscoveryPolicyMax) \ 2032 \ 2033 product(bool, ParallelRefProcEnabled, false, \ 2034 "Enable parallel reference processing whenever possible") \ 2035 \ 2036 product(bool, ParallelRefProcBalancingEnabled, true, \ 2037 "Enable balancing of reference processing queues") \ 2038 \ 2039 product(uintx, CMSTriggerRatio, 80, \ 2040 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2041 "allocated before a CMS collection cycle commences") \ 2042 range(0, 100) \ 2043 \ 2044 product(uintx, CMSBootstrapOccupancy, 50, \ 2045 "Percentage CMS generation occupancy at which to " \ 2046 "initiate CMS collection for bootstrapping collection stats") \ 2047 range(0, 100) \ 2048 \ 2049 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2050 "Percentage CMS generation occupancy to start a CMS collection " \ 2051 "cycle. A negative value means that CMSTriggerRatio is used") \ 2052 range(min_intx, 100) \ 2053 \ 2054 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2055 "Percentage of the (entire) heap occupancy to start a " \ 2056 "concurrent GC cycle. It is used by GCs that trigger a " \ 2057 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2058 "not just one of the generations (e.g., G1). A value of 0 " \ 2059 "denotes 'do constant GC cycles'.") \ 2060 range(0, 100) \ 2061 \ 2062 manageable(intx, CMSTriggerInterval, -1, \ 2063 "Commence a CMS collection cycle (at least) every so many " \ 2064 "milliseconds (0 permanently, -1 disabled)") \ 2065 range(-1, max_intx) \ 2066 \ 2067 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2068 "Only use occupancy as a criterion for starting a CMS collection")\ 2069 \ 2070 product(uintx, CMSIsTooFullPercentage, 98, \ 2071 "An absolute ceiling above which CMS will always consider the " \ 2072 "unloading of classes when class unloading is enabled") \ 2073 range(0, 100) \ 2074 \ 2075 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2076 "Check that all the garbage collected was returned to the " \ 2077 "free lists") \ 2078 \ 2079 notproduct(bool, ScavengeALot, false, \ 2080 "Force scavenge at every Nth exit from the runtime system " \ 2081 "(N=ScavengeALotInterval)") \ 2082 \ 2083 develop(bool, FullGCALot, false, \ 2084 "Force full gc at every Nth exit from the runtime system " \ 2085 "(N=FullGCALotInterval)") \ 2086 \ 2087 notproduct(bool, GCALotAtAllSafepoints, false, \ 2088 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2089 \ 2090 product(bool, PrintPromotionFailure, false, \ 2091 "Print additional diagnostic information following " \ 2092 "promotion failure") \ 2093 \ 2094 notproduct(bool, PromotionFailureALot, false, \ 2095 "Use promotion failure handling on every youngest generation " \ 2096 "collection") \ 2097 \ 2098 develop(uintx, PromotionFailureALotCount, 1000, \ 2099 "Number of promotion failures occurring at PLAB " \ 2100 "refill attempts (ParNew) or promotion attempts " \ 2101 "(other young collectors)") \ 2102 \ 2103 develop(uintx, PromotionFailureALotInterval, 5, \ 2104 "Total collections between promotion failures a lot") \ 2105 \ 2106 experimental(uintx, WorkStealingSleepMillis, 1, \ 2107 "Sleep time when sleep is used for yields") \ 2108 \ 2109 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2110 "Number of yields before a sleep is done during work stealing") \ 2111 \ 2112 experimental(uintx, WorkStealingHardSpins, 4096, \ 2113 "Number of iterations in a spin loop between checks on " \ 2114 "time out of hard spin") \ 2115 \ 2116 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2117 "Ratio of hard spins to calls to yield") \ 2118 \ 2119 develop(uintx, ObjArrayMarkingStride, 512, \ 2120 "Number of object array elements to push onto the marking stack " \ 2121 "before pushing a continuation entry") \ 2122 \ 2123 develop(bool, MetadataAllocationFailALot, false, \ 2124 "Fail metadata allocations at intervals controlled by " \ 2125 "MetadataAllocationFailALotInterval") \ 2126 \ 2127 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2128 "Metadata allocation failure a lot interval") \ 2129 \ 2130 develop(bool, TraceMetadataChunkAllocation, false, \ 2131 "Trace chunk metadata allocations") \ 2132 \ 2133 product(bool, TraceMetadataHumongousAllocation, false, \ 2134 "Trace humongous metadata allocations") \ 2135 \ 2136 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2137 "Trace virtual space metadata allocations") \ 2138 \ 2139 notproduct(bool, ExecuteInternalVMTests, false, \ 2140 "Enable execution of internal VM tests") \ 2141 \ 2142 notproduct(bool, VerboseInternalVMTests, false, \ 2143 "Turn on logging for internal VM tests.") \ 2144 \ 2145 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2146 \ 2147 product_pd(bool, ResizeTLAB, \ 2148 "Dynamically resize TLAB size for threads") \ 2149 \ 2150 product(bool, ZeroTLAB, false, \ 2151 "Zero out the newly created TLAB") \ 2152 \ 2153 product(bool, FastTLABRefill, true, \ 2154 "Use fast TLAB refill code") \ 2155 \ 2156 product(bool, PrintTLAB, false, \ 2157 "Print various TLAB related information") \ 2158 \ 2159 product(bool, TLABStats, true, \ 2160 "Provide more detailed and expensive TLAB statistics " \ 2161 "(with PrintTLAB)") \ 2162 \ 2163 product_pd(bool, NeverActAsServerClassMachine, \ 2164 "Never act like a server-class machine") \ 2165 \ 2166 product(bool, AlwaysActAsServerClassMachine, false, \ 2167 "Always act like a server-class machine") \ 2168 \ 2169 product_pd(uint64_t, MaxRAM, \ 2170 "Real memory size (in bytes) used to set maximum heap size") \ 2171 range(0, 0XFFFFFFFFFFFFFFFF) \ 2172 \ 2173 product(size_t, ErgoHeapSizeLimit, 0, \ 2174 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2175 "MaxRAM / MaxRAMFraction") \ 2176 \ 2177 product(uintx, MaxRAMFraction, 4, \ 2178 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2179 "size") \ 2180 range(1, max_uintx) \ 2181 \ 2182 product(uintx, MinRAMFraction, 2, \ 2183 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2184 "size on systems with small physical memory size") \ 2185 range(1, max_uintx) \ 2186 \ 2187 product(uintx, InitialRAMFraction, 64, \ 2188 "Fraction (1/n) of real memory used for initial heap size") \ 2189 range(1, max_uintx) \ 2190 \ 2191 develop(uintx, MaxVirtMemFraction, 2, \ 2192 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2193 "determining maximum heap size") \ 2194 \ 2195 product(bool, UseAutoGCSelectPolicy, false, \ 2196 "Use automatic collection selection policy") \ 2197 \ 2198 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2199 "Automatic GC selection pause threshold in milliseconds") \ 2200 \ 2201 product(bool, UseAdaptiveSizePolicy, true, \ 2202 "Use adaptive generation sizing policies") \ 2203 \ 2204 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2205 "Use adaptive survivor sizing policies") \ 2206 \ 2207 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2208 "Use adaptive young-old sizing policies at minor collections") \ 2209 \ 2210 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2211 "Use adaptive young-old sizing policies at major collections") \ 2212 \ 2213 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2214 "Include statistics from System.gc() for adaptive size policy") \ 2215 \ 2216 product(bool, UseAdaptiveGCBoundary, false, \ 2217 "Allow young-old boundary to move") \ 2218 \ 2219 develop(bool, TraceAdaptiveGCBoundary, false, \ 2220 "Trace young-old boundary moves") \ 2221 \ 2222 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2223 "Resize the virtual spaces of the young or old generations") \ 2224 range(-1, 1) \ 2225 \ 2226 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2227 "Policy for changing generation size for throughput goals") \ 2228 range(0, 1) \ 2229 \ 2230 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2231 "Number of steps where heuristics is used before data is used") \ 2232 \ 2233 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2234 "Number of collections before the adaptive sizing is started") \ 2235 \ 2236 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2237 "Collection interval for printing information; zero means never") \ 2238 \ 2239 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2240 "Use adaptive minimum footprint as a goal") \ 2241 \ 2242 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2243 "Weight given to exponential resizing, between 0 and 100") \ 2244 range(0, 100) \ 2245 \ 2246 product(uintx, AdaptiveTimeWeight, 25, \ 2247 "Weight given to time in adaptive policy, between 0 and 100") \ 2248 range(0, 100) \ 2249 \ 2250 product(uintx, PausePadding, 1, \ 2251 "How much buffer to keep for pause time") \ 2252 \ 2253 product(uintx, PromotedPadding, 3, \ 2254 "How much buffer to keep for promotion failure") \ 2255 \ 2256 product(uintx, SurvivorPadding, 3, \ 2257 "How much buffer to keep for survivor overflow") \ 2258 \ 2259 product(uintx, ThresholdTolerance, 10, \ 2260 "Allowed collection cost difference between generations") \ 2261 range(0, 100) \ 2262 \ 2263 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2264 "If collection costs are within margin, reduce both by full " \ 2265 "delta") \ 2266 \ 2267 product(uintx, YoungGenerationSizeIncrement, 20, \ 2268 "Adaptive size percentage change in young generation") \ 2269 range(0, 100) \ 2270 \ 2271 product(uintx, YoungGenerationSizeSupplement, 80, \ 2272 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2273 range(0, 100) \ 2274 \ 2275 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2276 "Decay factor to YoungedGenerationSizeSupplement") \ 2277 range(1, max_uintx) \ 2278 \ 2279 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2280 "Adaptive size percentage change in tenured generation") \ 2281 range(0, 100) \ 2282 \ 2283 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2284 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2285 range(0, 100) \ 2286 \ 2287 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2288 "Decay factor to TenuredGenerationSizeIncrement") \ 2289 range(1, max_uintx) \ 2290 \ 2291 product(uintx, MaxGCPauseMillis, max_uintx, \ 2292 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2293 "or (G1 Only) the maximum GC time per MMU time slice") \ 2294 range(1, max_uintx) \ 2295 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \ 2296 \ 2297 product(uintx, GCPauseIntervalMillis, 0, \ 2298 "Time slice for MMU specification") \ 2299 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \ 2300 \ 2301 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2302 "Adaptive size policy maximum GC minor pause time goal " \ 2303 "in millisecond") \ 2304 \ 2305 product(uintx, GCTimeRatio, 99, \ 2306 "Adaptive size policy application time to GC time ratio") \ 2307 \ 2308 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2309 "Adaptive size scale down factor for shrinking") \ 2310 range(1, max_uintx) \ 2311 \ 2312 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2313 "Adaptive size decays the major cost for long major intervals") \ 2314 \ 2315 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2316 "Time scale over which major costs decay") \ 2317 \ 2318 product(uintx, MinSurvivorRatio, 3, \ 2319 "Minimum ratio of young generation/survivor space size") \ 2320 range(3, max_uintx) \ 2321 \ 2322 product(uintx, InitialSurvivorRatio, 8, \ 2323 "Initial ratio of young generation/survivor space size") \ 2324 \ 2325 product(size_t, BaseFootPrintEstimate, 256*M, \ 2326 "Estimate of footprint other than Java Heap") \ 2327 \ 2328 product(bool, UseGCOverheadLimit, true, \ 2329 "Use policy to limit of proportion of time spent in GC " \ 2330 "before an OutOfMemory error is thrown") \ 2331 \ 2332 product(uintx, GCTimeLimit, 98, \ 2333 "Limit of the proportion of time spent in GC before " \ 2334 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2335 range(0, 100) \ 2336 \ 2337 product(uintx, GCHeapFreeLimit, 2, \ 2338 "Minimum percentage of free space after a full GC before an " \ 2339 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2340 range(0, 100) \ 2341 \ 2342 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2343 "Number of consecutive collections before gc time limit fires") \ 2344 range(1, max_uintx) \ 2345 \ 2346 product(bool, PrintAdaptiveSizePolicy, false, \ 2347 "Print information about AdaptiveSizePolicy") \ 2348 \ 2349 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2350 "How far ahead to prefetch destination area (<= 0 means off)") \ 2351 \ 2352 product(intx, PrefetchScanIntervalInBytes, -1, \ 2353 "How far ahead to prefetch scan area (<= 0 means off)") \ 2354 \ 2355 product(intx, PrefetchFieldsAhead, -1, \ 2356 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2357 \ 2358 diagnostic(bool, VerifySilently, false, \ 2359 "Do not print the verification progress") \ 2360 \ 2361 diagnostic(bool, VerifyDuringStartup, false, \ 2362 "Verify memory system before executing any Java code " \ 2363 "during VM initialization") \ 2364 \ 2365 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2366 "Verify system before exiting") \ 2367 \ 2368 diagnostic(bool, VerifyBeforeGC, false, \ 2369 "Verify memory system before GC") \ 2370 \ 2371 diagnostic(bool, VerifyAfterGC, false, \ 2372 "Verify memory system after GC") \ 2373 \ 2374 diagnostic(bool, VerifyDuringGC, false, \ 2375 "Verify memory system during GC (between phases)") \ 2376 \ 2377 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2378 "Enable parallel memory system verification") \ 2379 \ 2380 diagnostic(bool, DeferInitialCardMark, false, \ 2381 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2382 "may arise from new_pre_store_barrier") \ 2383 \ 2384 product(bool, UseCondCardMark, false, \ 2385 "Check for already marked card before updating card table") \ 2386 \ 2387 diagnostic(bool, VerifyRememberedSets, false, \ 2388 "Verify GC remembered sets") \ 2389 \ 2390 diagnostic(bool, VerifyObjectStartArray, true, \ 2391 "Verify GC object start array if verify before/after") \ 2392 \ 2393 product(bool, DisableExplicitGC, false, \ 2394 "Ignore calls to System.gc()") \ 2395 \ 2396 notproduct(bool, CheckMemoryInitialization, false, \ 2397 "Check memory initialization") \ 2398 \ 2399 diagnostic(bool, BindCMSThreadToCPU, false, \ 2400 "Bind CMS Thread to CPU if possible") \ 2401 \ 2402 diagnostic(uintx, CPUForCMSThread, 0, \ 2403 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2404 \ 2405 product(bool, BindGCTaskThreadsToCPUs, false, \ 2406 "Bind GCTaskThreads to CPUs if possible") \ 2407 \ 2408 product(bool, UseGCTaskAffinity, false, \ 2409 "Use worker affinity when asking for GCTasks") \ 2410 \ 2411 product(uintx, ProcessDistributionStride, 4, \ 2412 "Stride through processors when distributing processes") \ 2413 \ 2414 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2415 "Number of times the coordinator GC thread will sleep while " \ 2416 "yielding before giving up and resuming GC") \ 2417 \ 2418 product(uintx, CMSYieldSleepCount, 0, \ 2419 "Number of times a GC thread (minus the coordinator) " \ 2420 "will sleep while yielding before giving up and resuming GC") \ 2421 \ 2422 /* gc tracing */ \ 2423 manageable(bool, PrintGC, false, \ 2424 "Print message at garbage collection") \ 2425 \ 2426 manageable(bool, PrintGCDetails, false, \ 2427 "Print more details at garbage collection") \ 2428 \ 2429 manageable(bool, PrintGCDateStamps, false, \ 2430 "Print date stamps at garbage collection") \ 2431 \ 2432 manageable(bool, PrintGCTimeStamps, false, \ 2433 "Print timestamps at garbage collection") \ 2434 \ 2435 manageable(bool, PrintGCID, true, \ 2436 "Print an identifier for each garbage collection") \ 2437 \ 2438 product(bool, PrintGCTaskTimeStamps, false, \ 2439 "Print timestamps for individual gc worker thread tasks") \ 2440 \ 2441 develop(intx, ConcGCYieldTimeout, 0, \ 2442 "If non-zero, assert that GC threads yield within this " \ 2443 "number of milliseconds") \ 2444 range(0, max_intx) \ 2445 \ 2446 product(bool, PrintReferenceGC, false, \ 2447 "Print times spent handling reference objects during GC " \ 2448 "(enabled only when PrintGCDetails)") \ 2449 \ 2450 develop(bool, TraceReferenceGC, false, \ 2451 "Trace handling of soft/weak/final/phantom references") \ 2452 \ 2453 develop(bool, TraceFinalizerRegistration, false, \ 2454 "Trace registration of final references") \ 2455 \ 2456 notproduct(bool, TraceScavenge, false, \ 2457 "Trace scavenge") \ 2458 \ 2459 product(bool, IgnoreEmptyClassPaths, false, \ 2460 "Ignore empty path elements in -classpath") \ 2461 \ 2462 product(bool, TraceClassPaths, false, \ 2463 "Trace processing of class paths") \ 2464 \ 2465 product_rw(bool, TraceClassLoading, false, \ 2466 "Trace all classes loaded") \ 2467 \ 2468 product(bool, TraceClassLoadingPreorder, false, \ 2469 "Trace all classes loaded in order referenced (not loaded)") \ 2470 \ 2471 product_rw(bool, TraceClassUnloading, false, \ 2472 "Trace unloading of classes") \ 2473 \ 2474 product_rw(bool, TraceLoaderConstraints, false, \ 2475 "Trace loader constraints") \ 2476 \ 2477 develop(bool, TraceClassLoaderData, false, \ 2478 "Trace class loader loader_data lifetime") \ 2479 \ 2480 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2481 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2482 "Initial size of the boot class loader data metaspace") \ 2483 range(30*K, max_uintx/BytesPerWord) \ 2484 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2485 \ 2486 product(bool, TraceYoungGenTime, false, \ 2487 "Trace accumulated time for young collection") \ 2488 \ 2489 product(bool, TraceOldGenTime, false, \ 2490 "Trace accumulated time for old collection") \ 2491 \ 2492 product(bool, PrintTenuringDistribution, false, \ 2493 "Print tenuring age information") \ 2494 \ 2495 product_rw(bool, PrintHeapAtGC, false, \ 2496 "Print heap layout before and after each GC") \ 2497 \ 2498 product_rw(bool, PrintHeapAtGCExtended, false, \ 2499 "Print extended information about the layout of the heap " \ 2500 "when -XX:+PrintHeapAtGC is set") \ 2501 \ 2502 product(bool, PrintHeapAtSIGBREAK, true, \ 2503 "Print heap layout in response to SIGBREAK") \ 2504 \ 2505 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2506 "Print a class histogram before any major stop-world GC") \ 2507 \ 2508 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2509 "Print a class histogram after any major stop-world GC") \ 2510 \ 2511 manageable(bool, PrintClassHistogram, false, \ 2512 "Print a histogram of class instances") \ 2513 \ 2514 develop(bool, TraceWorkGang, false, \ 2515 "Trace activities of work gangs") \ 2516 \ 2517 product(bool, TraceParallelOldGCTasks, false, \ 2518 "Trace multithreaded GC activity") \ 2519 \ 2520 develop(bool, TraceBlockOffsetTable, false, \ 2521 "Print BlockOffsetTable maps") \ 2522 \ 2523 develop(bool, TraceCardTableModRefBS, false, \ 2524 "Print CardTableModRefBS maps") \ 2525 \ 2526 develop(bool, TraceGCTaskManager, false, \ 2527 "Trace actions of the GC task manager") \ 2528 \ 2529 develop(bool, TraceGCTaskQueue, false, \ 2530 "Trace actions of the GC task queues") \ 2531 \ 2532 diagnostic(bool, TraceGCTaskThread, false, \ 2533 "Trace actions of the GC task threads") \ 2534 \ 2535 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2536 "Print the time taken by each phase in ParallelOldGC " \ 2537 "(PrintGCDetails must also be enabled)") \ 2538 \ 2539 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2540 "Trace marking phase in ParallelOldGC") \ 2541 \ 2542 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2543 "Trace summary phase in ParallelOldGC") \ 2544 \ 2545 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2546 "Trace compaction phase in ParallelOldGC") \ 2547 \ 2548 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2549 "Trace dense prefix computation for ParallelOldGC") \ 2550 \ 2551 develop(bool, IgnoreLibthreadGPFault, false, \ 2552 "Suppress workaround for libthread GP fault") \ 2553 \ 2554 product(bool, PrintJNIGCStalls, false, \ 2555 "Print diagnostic message when GC is stalled " \ 2556 "by JNI critical section") \ 2557 \ 2558 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2559 "The percentage of the used heap that the instances of a class " \ 2560 "must occupy for the class to generate a trace event") \ 2561 range(0.0, 100.0) \ 2562 \ 2563 /* GC log rotation setting */ \ 2564 \ 2565 product(bool, UseGCLogFileRotation, false, \ 2566 "Rotate gclog files (for long running applications). It requires "\ 2567 "-Xloggc:<filename>") \ 2568 \ 2569 product(uintx, NumberOfGCLogFiles, 0, \ 2570 "Number of gclog files in rotation " \ 2571 "(default: 0, no rotation)") \ 2572 \ 2573 product(size_t, GCLogFileSize, 8*K, \ 2574 "GC log file size, requires UseGCLogFileRotation. " \ 2575 "Set to 0 to only trigger rotation via jcmd") \ 2576 \ 2577 /* JVMTI heap profiling */ \ 2578 \ 2579 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2580 "Trace JVMTI object tagging calls") \ 2581 \ 2582 diagnostic(bool, VerifyBeforeIteration, false, \ 2583 "Verify memory system before JVMTI iteration") \ 2584 \ 2585 /* compiler interface */ \ 2586 \ 2587 develop(bool, CIPrintCompilerName, false, \ 2588 "when CIPrint is active, print the name of the active compiler") \ 2589 \ 2590 diagnostic(bool, CIPrintCompileQueue, false, \ 2591 "display the contents of the compile queue whenever a " \ 2592 "compilation is enqueued") \ 2593 \ 2594 develop(bool, CIPrintRequests, false, \ 2595 "display every request for compilation") \ 2596 \ 2597 product(bool, CITime, false, \ 2598 "collect timing information for compilation") \ 2599 \ 2600 develop(bool, CITimeVerbose, false, \ 2601 "be more verbose in compilation timings") \ 2602 \ 2603 develop(bool, CITimeEach, false, \ 2604 "display timing information after each successful compilation") \ 2605 \ 2606 develop(bool, CICountOSR, false, \ 2607 "use a separate counter when assigning ids to osr compilations") \ 2608 \ 2609 develop(bool, CICompileNatives, true, \ 2610 "compile native methods if supported by the compiler") \ 2611 \ 2612 develop_pd(bool, CICompileOSR, \ 2613 "compile on stack replacement methods if supported by the " \ 2614 "compiler") \ 2615 \ 2616 develop(bool, CIPrintMethodCodes, false, \ 2617 "print method bytecodes of the compiled code") \ 2618 \ 2619 develop(bool, CIPrintTypeFlow, false, \ 2620 "print the results of ciTypeFlow analysis") \ 2621 \ 2622 develop(bool, CITraceTypeFlow, false, \ 2623 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2624 \ 2625 develop(intx, OSROnlyBCI, -1, \ 2626 "OSR only at this bci. Negative values mean exclude that bci") \ 2627 \ 2628 /* compiler */ \ 2629 \ 2630 /* notice: the max range value here is max_jint, not max_intx */ \ 2631 /* because of overflow issue */ \ 2632 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2633 "Number of compiler threads to run") \ 2634 range(0, max_jint) \ 2635 constraint(CICompilerCountConstraintFunc, AtParse) \ 2636 \ 2637 product(intx, CompilationPolicyChoice, 0, \ 2638 "which compilation policy (0-3)") \ 2639 range(0, 3) \ 2640 \ 2641 develop(bool, UseStackBanging, true, \ 2642 "use stack banging for stack overflow checks (required for " \ 2643 "proper StackOverflow handling; disable only to measure cost " \ 2644 "of stackbanging)") \ 2645 \ 2646 develop(bool, UseStrictFP, true, \ 2647 "use strict fp if modifier strictfp is set") \ 2648 \ 2649 develop(bool, GenerateSynchronizationCode, true, \ 2650 "generate locking/unlocking code for synchronized methods and " \ 2651 "monitors") \ 2652 \ 2653 develop(bool, GenerateCompilerNullChecks, true, \ 2654 "Generate explicit null checks for loads/stores/calls") \ 2655 \ 2656 develop(bool, GenerateRangeChecks, true, \ 2657 "Generate range checks for array accesses") \ 2658 \ 2659 develop_pd(bool, ImplicitNullChecks, \ 2660 "Generate code for implicit null checks") \ 2661 \ 2662 product_pd(bool, TrapBasedNullChecks, \ 2663 "Generate code for null checks that uses a cmp and trap " \ 2664 "instruction raising SIGTRAP. This is only used if an access to" \ 2665 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2666 "ImplicitNullChecks don't work (PPC64).") \ 2667 \ 2668 product(bool, PrintSafepointStatistics, false, \ 2669 "Print statistics about safepoint synchronization") \ 2670 \ 2671 product(intx, PrintSafepointStatisticsCount, 300, \ 2672 "Total number of safepoint statistics collected " \ 2673 "before printing them out") \ 2674 range(1, max_intx) \ 2675 \ 2676 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2677 "Print safepoint statistics only when safepoint takes " \ 2678 "more than PrintSafepointSatisticsTimeout in millis") \ 2679 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2680 NOT_LP64(range(-1, max_intx)) \ 2681 \ 2682 product(bool, TraceSafepointCleanupTime, false, \ 2683 "Print the break down of clean up tasks performed during " \ 2684 "safepoint") \ 2685 \ 2686 product(bool, Inline, true, \ 2687 "Enable inlining") \ 2688 \ 2689 product(bool, ClipInlining, true, \ 2690 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2691 \ 2692 develop(bool, UseCHA, true, \ 2693 "Enable CHA") \ 2694 \ 2695 product(bool, UseTypeProfile, true, \ 2696 "Check interpreter profile for historically monomorphic calls") \ 2697 \ 2698 diagnostic(bool, PrintInlining, false, \ 2699 "Print inlining optimizations") \ 2700 \ 2701 product(bool, UsePopCountInstruction, false, \ 2702 "Use population count instruction") \ 2703 \ 2704 develop(bool, EagerInitialization, false, \ 2705 "Eagerly initialize classes if possible") \ 2706 \ 2707 diagnostic(bool, LogTouchedMethods, false, \ 2708 "Log methods which have been ever touched in runtime") \ 2709 \ 2710 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2711 "Print all methods that have been ever touched in runtime") \ 2712 \ 2713 develop(bool, TraceMethodReplacement, false, \ 2714 "Print when methods are replaced do to recompilation") \ 2715 \ 2716 develop(bool, PrintMethodFlushing, false, \ 2717 "Print the nmethods being flushed") \ 2718 \ 2719 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2720 "print statistics about method flushing") \ 2721 \ 2722 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2723 "Number of compiled code invocations after which " \ 2724 "the method is considered as hot by the flusher") \ 2725 range(1, max_jint) \ 2726 \ 2727 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2728 "Minimum number of sweeper passes before an nmethod " \ 2729 "can be flushed") \ 2730 range(0, max_intx) \ 2731 \ 2732 product(bool, UseCodeAging, true, \ 2733 "Insert counter to detect warm methods") \ 2734 \ 2735 diagnostic(bool, StressCodeAging, false, \ 2736 "Start with counters compiled in") \ 2737 \ 2738 develop(bool, UseRelocIndex, false, \ 2739 "Use an index to speed random access to relocations") \ 2740 \ 2741 develop(bool, StressCodeBuffers, false, \ 2742 "Exercise code buffer expansion and other rare state changes") \ 2743 \ 2744 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2745 "Generate extra debugging information for non-safepoints in " \ 2746 "nmethods") \ 2747 \ 2748 product(bool, PrintVMOptions, false, \ 2749 "Print flags that appeared on the command line") \ 2750 \ 2751 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2752 "Ignore unrecognized VM options") \ 2753 \ 2754 product(bool, PrintCommandLineFlags, false, \ 2755 "Print flags specified on command line or set by ergonomics") \ 2756 \ 2757 product(bool, PrintFlagsInitial, false, \ 2758 "Print all VM flags before argument processing and exit VM") \ 2759 \ 2760 product(bool, PrintFlagsFinal, false, \ 2761 "Print all VM flags after argument and ergonomic processing") \ 2762 \ 2763 notproduct(bool, PrintFlagsWithComments, false, \ 2764 "Print all VM flags with default values and descriptions and " \ 2765 "exit") \ 2766 \ 2767 product(bool, PrintFlagsRanges, false, \ 2768 "Print VM flags and their ranges and exit VM") \ 2769 \ 2770 diagnostic(bool, SerializeVMOutput, true, \ 2771 "Use a mutex to serialize output to tty and LogFile") \ 2772 \ 2773 diagnostic(bool, DisplayVMOutput, true, \ 2774 "Display all VM output on the tty, independently of LogVMOutput") \ 2775 \ 2776 diagnostic(bool, LogVMOutput, false, \ 2777 "Save VM output to LogFile") \ 2778 \ 2779 diagnostic(ccstr, LogFile, NULL, \ 2780 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2781 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2782 \ 2783 product(ccstr, ErrorFile, NULL, \ 2784 "If an error occurs, save the error data to this file " \ 2785 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2786 \ 2787 product(bool, DisplayVMOutputToStderr, false, \ 2788 "If DisplayVMOutput is true, display all VM output to stderr") \ 2789 \ 2790 product(bool, DisplayVMOutputToStdout, false, \ 2791 "If DisplayVMOutput is true, display all VM output to stdout") \ 2792 \ 2793 product(bool, UseHeavyMonitors, false, \ 2794 "use heavyweight instead of lightweight Java monitors") \ 2795 \ 2796 product(bool, PrintStringTableStatistics, false, \ 2797 "print statistics about the StringTable and SymbolTable") \ 2798 \ 2799 diagnostic(bool, VerifyStringTableAtExit, false, \ 2800 "verify StringTable contents at exit") \ 2801 \ 2802 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2803 "print histogram of the symbol table") \ 2804 \ 2805 notproduct(bool, ExitVMOnVerifyError, false, \ 2806 "standard exit from VM if bytecode verify error " \ 2807 "(only in debug mode)") \ 2808 \ 2809 diagnostic(ccstr, AbortVMOnException, NULL, \ 2810 "Call fatal if this exception is thrown. Example: " \ 2811 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2812 \ 2813 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2814 "Call fatal if the exception pointed by AbortVMOnException " \ 2815 "has this message") \ 2816 \ 2817 develop(bool, DebugVtables, false, \ 2818 "add debugging code to vtable dispatch") \ 2819 \ 2820 develop(bool, PrintVtables, false, \ 2821 "print vtables when printing klass") \ 2822 \ 2823 notproduct(bool, PrintVtableStats, false, \ 2824 "print vtables stats at end of run") \ 2825 \ 2826 develop(bool, TraceCreateZombies, false, \ 2827 "trace creation of zombie nmethods") \ 2828 \ 2829 notproduct(bool, IgnoreLockingAssertions, false, \ 2830 "disable locking assertions (for speed)") \ 2831 \ 2832 product(bool, RangeCheckElimination, true, \ 2833 "Eliminate range checks") \ 2834 \ 2835 develop_pd(bool, UncommonNullCast, \ 2836 "track occurrences of null in casts; adjust compiler tactics") \ 2837 \ 2838 develop(bool, TypeProfileCasts, true, \ 2839 "treat casts like calls for purposes of type profiling") \ 2840 \ 2841 develop(bool, DelayCompilationDuringStartup, true, \ 2842 "Delay invoking the compiler until main application class is " \ 2843 "loaded") \ 2844 \ 2845 develop(bool, CompileTheWorld, false, \ 2846 "Compile all methods in all classes in bootstrap class path " \ 2847 "(stress test)") \ 2848 \ 2849 develop(bool, CompileTheWorldPreloadClasses, true, \ 2850 "Preload all classes used by a class before start loading") \ 2851 \ 2852 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2853 "Force a safepoint every n compiles so sweeper can keep up") \ 2854 \ 2855 develop(bool, FillDelaySlots, true, \ 2856 "Fill delay slots (on SPARC only)") \ 2857 \ 2858 develop(bool, TimeLivenessAnalysis, false, \ 2859 "Time computation of bytecode liveness analysis") \ 2860 \ 2861 develop(bool, TraceLivenessGen, false, \ 2862 "Trace the generation of liveness analysis information") \ 2863 \ 2864 notproduct(bool, TraceLivenessQuery, false, \ 2865 "Trace queries of liveness analysis information") \ 2866 \ 2867 notproduct(bool, CollectIndexSetStatistics, false, \ 2868 "Collect information about IndexSets") \ 2869 \ 2870 develop(bool, UseLoopSafepoints, true, \ 2871 "Generate Safepoint nodes in every loop") \ 2872 \ 2873 develop(intx, FastAllocateSizeLimit, 128*K, \ 2874 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2875 "Inline allocations larger than this in doublewords must go slow")\ 2876 \ 2877 product(bool, AggressiveOpts, false, \ 2878 "Enable aggressive optimizations - see arguments.cpp") \ 2879 \ 2880 product_pd(uintx, TypeProfileLevel, \ 2881 "=XYZ, with Z: Type profiling of arguments at call; " \ 2882 "Y: Type profiling of return value at call; " \ 2883 "X: Type profiling of parameters to methods; " \ 2884 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2885 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2886 \ 2887 product(intx, TypeProfileArgsLimit, 2, \ 2888 "max number of call arguments to consider for type profiling") \ 2889 range(0, 16) \ 2890 \ 2891 product(intx, TypeProfileParmsLimit, 2, \ 2892 "max number of incoming parameters to consider for type profiling"\ 2893 ", -1 for all") \ 2894 range(-1, 64) \ 2895 \ 2896 /* statistics */ \ 2897 develop(bool, CountCompiledCalls, false, \ 2898 "Count method invocations") \ 2899 \ 2900 notproduct(bool, CountRuntimeCalls, false, \ 2901 "Count VM runtime calls") \ 2902 \ 2903 develop(bool, CountJNICalls, false, \ 2904 "Count jni method invocations") \ 2905 \ 2906 notproduct(bool, CountJVMCalls, false, \ 2907 "Count jvm method invocations") \ 2908 \ 2909 notproduct(bool, CountRemovableExceptions, false, \ 2910 "Count exceptions that could be replaced by branches due to " \ 2911 "inlining") \ 2912 \ 2913 notproduct(bool, ICMissHistogram, false, \ 2914 "Produce histogram of IC misses") \ 2915 \ 2916 /* interpreter */ \ 2917 develop(bool, ClearInterpreterLocals, false, \ 2918 "Always clear local variables of interpreter activations upon " \ 2919 "entry") \ 2920 \ 2921 product_pd(bool, RewriteBytecodes, \ 2922 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2923 \ 2924 product_pd(bool, RewriteFrequentPairs, \ 2925 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2926 \ 2927 diagnostic(bool, PrintInterpreter, false, \ 2928 "Print the generated interpreter code") \ 2929 \ 2930 product(bool, UseInterpreter, true, \ 2931 "Use interpreter for non-compiled methods") \ 2932 \ 2933 develop(bool, UseFastSignatureHandlers, true, \ 2934 "Use fast signature handlers for native calls") \ 2935 \ 2936 product(bool, UseLoopCounter, true, \ 2937 "Increment invocation counter on backward branch") \ 2938 \ 2939 product_pd(bool, UseOnStackReplacement, \ 2940 "Use on stack replacement, calls runtime if invoc. counter " \ 2941 "overflows in loop") \ 2942 \ 2943 notproduct(bool, TraceOnStackReplacement, false, \ 2944 "Trace on stack replacement") \ 2945 \ 2946 product_pd(bool, PreferInterpreterNativeStubs, \ 2947 "Use always interpreter stubs for native methods invoked via " \ 2948 "interpreter") \ 2949 \ 2950 develop(bool, CountBytecodes, false, \ 2951 "Count number of bytecodes executed") \ 2952 \ 2953 develop(bool, PrintBytecodeHistogram, false, \ 2954 "Print histogram of the executed bytecodes") \ 2955 \ 2956 develop(bool, PrintBytecodePairHistogram, false, \ 2957 "Print histogram of the executed bytecode pairs") \ 2958 \ 2959 diagnostic(bool, PrintSignatureHandlers, false, \ 2960 "Print code generated for native method signature handlers") \ 2961 \ 2962 develop(bool, VerifyOops, false, \ 2963 "Do plausibility checks for oops") \ 2964 \ 2965 develop(bool, CheckUnhandledOops, false, \ 2966 "Check for unhandled oops in VM code") \ 2967 \ 2968 develop(bool, VerifyJNIFields, trueInDebug, \ 2969 "Verify jfieldIDs for instance fields") \ 2970 \ 2971 notproduct(bool, VerifyJNIEnvThread, false, \ 2972 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2973 "from JNI") \ 2974 \ 2975 develop(bool, VerifyFPU, false, \ 2976 "Verify FPU state (check for NaN's, etc.)") \ 2977 \ 2978 develop(bool, VerifyThread, false, \ 2979 "Watch the thread register for corruption (SPARC only)") \ 2980 \ 2981 develop(bool, VerifyActivationFrameSize, false, \ 2982 "Verify that activation frame didn't become smaller than its " \ 2983 "minimal size") \ 2984 \ 2985 develop(bool, TraceFrequencyInlining, false, \ 2986 "Trace frequency based inlining") \ 2987 \ 2988 develop_pd(bool, InlineIntrinsics, \ 2989 "Inline intrinsics that can be statically resolved") \ 2990 \ 2991 product_pd(bool, ProfileInterpreter, \ 2992 "Profile at the bytecode level during interpretation") \ 2993 \ 2994 develop(bool, TraceProfileInterpreter, false, \ 2995 "Trace profiling at the bytecode level during interpretation. " \ 2996 "This outputs the profiling information collected to improve " \ 2997 "jit compilation.") \ 2998 \ 2999 develop_pd(bool, ProfileTraps, \ 3000 "Profile deoptimization traps at the bytecode level") \ 3001 \ 3002 product(intx, ProfileMaturityPercentage, 20, \ 3003 "number of method invocations/branches (expressed as % of " \ 3004 "CompileThreshold) before using the method's profile") \ 3005 range(0, 100) \ 3006 \ 3007 diagnostic(bool, PrintMethodData, false, \ 3008 "Print the results of +ProfileInterpreter at end of run") \ 3009 \ 3010 develop(bool, VerifyDataPointer, trueInDebug, \ 3011 "Verify the method data pointer during interpreter profiling") \ 3012 \ 3013 develop(bool, VerifyCompiledCode, false, \ 3014 "Include miscellaneous runtime verifications in nmethod code; " \ 3015 "default off because it disturbs nmethod size heuristics") \ 3016 \ 3017 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 3018 "Manually make GC thread crash then dump java stack trace; " \ 3019 "Test only") \ 3020 \ 3021 /* compilation */ \ 3022 product(bool, UseCompiler, true, \ 3023 "Use Just-In-Time compilation") \ 3024 \ 3025 develop(bool, TraceCompilationPolicy, false, \ 3026 "Trace compilation policy") \ 3027 \ 3028 develop(bool, TimeCompilationPolicy, false, \ 3029 "Time the compilation policy") \ 3030 \ 3031 product(bool, UseCounterDecay, true, \ 3032 "Adjust recompilation counters") \ 3033 \ 3034 develop(intx, CounterHalfLifeTime, 30, \ 3035 "Half-life time of invocation counters (in seconds)") \ 3036 \ 3037 develop(intx, CounterDecayMinIntervalLength, 500, \ 3038 "The minimum interval (in milliseconds) between invocation of " \ 3039 "CounterDecay") \ 3040 \ 3041 product(bool, AlwaysCompileLoopMethods, false, \ 3042 "When using recompilation, never interpret methods " \ 3043 "containing loops") \ 3044 \ 3045 product(bool, DontCompileHugeMethods, true, \ 3046 "Do not compile methods > HugeMethodLimit") \ 3047 \ 3048 /* Bytecode escape analysis estimation. */ \ 3049 product(bool, EstimateArgEscape, true, \ 3050 "Analyze bytecodes to estimate escape state of arguments") \ 3051 \ 3052 product(intx, BCEATraceLevel, 0, \ 3053 "How much tracing to do of bytecode escape analysis estimates " \ 3054 "(0-3)") \ 3055 range(0, 3) \ 3056 \ 3057 product(intx, MaxBCEAEstimateLevel, 5, \ 3058 "Maximum number of nested calls that are analyzed by BC EA") \ 3059 range(0, max_jint) \ 3060 \ 3061 product(intx, MaxBCEAEstimateSize, 150, \ 3062 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3063 range(0, max_jint) \ 3064 \ 3065 product(intx, AllocatePrefetchStyle, 1, \ 3066 "0 = no prefetch, " \ 3067 "1 = prefetch instructions for each allocation, " \ 3068 "2 = use TLAB watermark to gate allocation prefetch, " \ 3069 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3070 range(0, 3) \ 3071 \ 3072 product(intx, AllocatePrefetchDistance, -1, \ 3073 "Distance to prefetch ahead of allocation pointer. " \ 3074 "-1: use system-specific value (automatically determined") \ 3075 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 3076 \ 3077 product(intx, AllocatePrefetchLines, 3, \ 3078 "Number of lines to prefetch ahead of array allocation pointer") \ 3079 range(1, max_jint / 2) \ 3080 \ 3081 product(intx, AllocateInstancePrefetchLines, 1, \ 3082 "Number of lines to prefetch ahead of instance allocation " \ 3083 "pointer") \ 3084 range(1, max_jint / 2) \ 3085 \ 3086 product(intx, AllocatePrefetchStepSize, 16, \ 3087 "Step size in bytes of sequential prefetch instructions") \ 3088 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 3089 \ 3090 product(intx, AllocatePrefetchInstr, 0, \ 3091 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3092 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \ 3093 \ 3094 /* deoptimization */ \ 3095 develop(bool, TraceDeoptimization, false, \ 3096 "Trace deoptimization") \ 3097 \ 3098 develop(bool, PrintDeoptimizationDetails, false, \ 3099 "Print more information about deoptimization") \ 3100 \ 3101 develop(bool, DebugDeoptimization, false, \ 3102 "Tracing various information while debugging deoptimization") \ 3103 \ 3104 product(intx, SelfDestructTimer, 0, \ 3105 "Will cause VM to terminate after a given time (in minutes) " \ 3106 "(0 means off)") \ 3107 range(0, max_intx) \ 3108 \ 3109 product(intx, MaxJavaStackTraceDepth, 1024, \ 3110 "The maximum number of lines in the stack trace for Java " \ 3111 "exceptions (0 means all)") \ 3112 range(0, max_jint/2) \ 3113 \ 3114 /* notice: the max range value here is max_jint, not max_intx */ \ 3115 /* because of overflow issue */ \ 3116 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3117 "Guarantee a safepoint (at least) every so many milliseconds " \ 3118 "(0 means none)")) \ 3119 NOT_EMBEDDED(range(0, max_jint)) \ 3120 \ 3121 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3122 "Guarantee a safepoint (at least) every so many milliseconds " \ 3123 "(0 means none)")) \ 3124 EMBEDDED_ONLY(range(0, max_jint)) \ 3125 \ 3126 product(intx, SafepointTimeoutDelay, 10000, \ 3127 "Delay in milliseconds for option SafepointTimeout") \ 3128 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 3129 NOT_LP64(range(0, max_intx)) \ 3130 \ 3131 product(intx, NmethodSweepActivity, 10, \ 3132 "Removes cold nmethods from code cache if > 0. Higher values " \ 3133 "result in more aggressive sweeping") \ 3134 range(0, 2000) \ 3135 \ 3136 notproduct(bool, LogSweeper, false, \ 3137 "Keep a ring buffer of sweeper activity") \ 3138 \ 3139 notproduct(intx, SweeperLogEntries, 1024, \ 3140 "Number of records in the ring buffer of sweeper activity") \ 3141 \ 3142 notproduct(intx, MemProfilingInterval, 500, \ 3143 "Time between each invocation of the MemProfiler") \ 3144 \ 3145 develop(intx, MallocCatchPtr, -1, \ 3146 "Hit breakpoint when mallocing/freeing this pointer") \ 3147 \ 3148 notproduct(ccstrlist, SuppressErrorAt, "", \ 3149 "List of assertions (file:line) to muzzle") \ 3150 \ 3151 notproduct(size_t, HandleAllocationLimit, 1024, \ 3152 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3153 "is used") \ 3154 \ 3155 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3156 "Threshold for total handle allocation when " \ 3157 "+TraceHandleAllocation is used") \ 3158 \ 3159 develop(intx, StackPrintLimit, 100, \ 3160 "number of stack frames to print in VM-level stack dump") \ 3161 \ 3162 notproduct(intx, MaxElementPrintSize, 256, \ 3163 "maximum number of elements to print") \ 3164 \ 3165 notproduct(intx, MaxSubklassPrintSize, 4, \ 3166 "maximum number of subklasses to print when printing klass") \ 3167 \ 3168 product(intx, MaxInlineLevel, 9, \ 3169 "maximum number of nested calls that are inlined") \ 3170 range(0, max_jint) \ 3171 \ 3172 product(intx, MaxRecursiveInlineLevel, 1, \ 3173 "maximum number of nested recursive calls that are inlined") \ 3174 range(0, max_jint) \ 3175 \ 3176 develop(intx, MaxForceInlineLevel, 100, \ 3177 "maximum number of nested calls that are forced for inlining " \ 3178 "(using CompileCommand or marked w/ @ForceInline)") \ 3179 range(0, max_jint) \ 3180 \ 3181 product_pd(intx, InlineSmallCode, \ 3182 "Only inline already compiled methods if their code size is " \ 3183 "less than this") \ 3184 range(0, max_jint) \ 3185 \ 3186 product(intx, MaxInlineSize, 35, \ 3187 "The maximum bytecode size of a method to be inlined") \ 3188 range(0, max_jint) \ 3189 \ 3190 product_pd(intx, FreqInlineSize, \ 3191 "The maximum bytecode size of a frequent method to be inlined") \ 3192 range(0, max_jint) \ 3193 \ 3194 product(intx, MaxTrivialSize, 6, \ 3195 "The maximum bytecode size of a trivial method to be inlined") \ 3196 range(0, max_jint) \ 3197 \ 3198 product(intx, MinInliningThreshold, 250, \ 3199 "The minimum invocation count a method needs to have to be " \ 3200 "inlined") \ 3201 range(0, max_jint) \ 3202 \ 3203 develop(intx, MethodHistogramCutoff, 100, \ 3204 "The cutoff value for method invocation histogram (+CountCalls)") \ 3205 \ 3206 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3207 "Number of interpreted methods to show in profile") \ 3208 \ 3209 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3210 "Number of compiled methods to show in profile") \ 3211 \ 3212 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3213 "Number of stub methods to show in profile") \ 3214 \ 3215 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3216 "Number of runtime stub nodes to show in profile") \ 3217 \ 3218 product(intx, ProfileIntervalsTicks, 100, \ 3219 "Number of ticks between printing of interval profile " \ 3220 "(+ProfileIntervals)") \ 3221 range(0, max_intx) \ 3222 \ 3223 notproduct(intx, ScavengeALotInterval, 1, \ 3224 "Interval between which scavenge will occur with +ScavengeALot") \ 3225 \ 3226 notproduct(intx, FullGCALotInterval, 1, \ 3227 "Interval between which full gc will occur with +FullGCALot") \ 3228 \ 3229 notproduct(intx, FullGCALotStart, 0, \ 3230 "For which invocation to start FullGCAlot") \ 3231 \ 3232 notproduct(intx, FullGCALotDummies, 32*K, \ 3233 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3234 "to move") \ 3235 \ 3236 develop(intx, DontYieldALotInterval, 10, \ 3237 "Interval between which yields will be dropped (milliseconds)") \ 3238 \ 3239 develop(intx, MinSleepInterval, 1, \ 3240 "Minimum sleep() interval (milliseconds) when " \ 3241 "ConvertSleepToYield is off (used for Solaris)") \ 3242 \ 3243 develop(intx, ProfilerPCTickThreshold, 15, \ 3244 "Number of ticks in a PC buckets to be a hotspot") \ 3245 \ 3246 notproduct(intx, DeoptimizeALotInterval, 5, \ 3247 "Number of exits until DeoptimizeALot kicks in") \ 3248 \ 3249 notproduct(intx, ZombieALotInterval, 5, \ 3250 "Number of exits until ZombieALot kicks in") \ 3251 \ 3252 diagnostic(intx, MallocVerifyInterval, 0, \ 3253 "If non-zero, verify C heap after every N calls to " \ 3254 "malloc/realloc/free") \ 3255 range(0, max_intx) \ 3256 \ 3257 diagnostic(intx, MallocVerifyStart, 0, \ 3258 "If non-zero, start verifying C heap after Nth call to " \ 3259 "malloc/realloc/free") \ 3260 range(0, max_intx) \ 3261 \ 3262 diagnostic(uintx, MallocMaxTestWords, 0, \ 3263 "If non-zero, maximum number of words that malloc/realloc can " \ 3264 "allocate (for testing only)") \ 3265 range(0, max_uintx) \ 3266 \ 3267 product(intx, TypeProfileWidth, 2, \ 3268 "Number of receiver types to record in call/cast profile") \ 3269 range(0, 8) \ 3270 \ 3271 experimental(intx, MethodProfileWidth, 0, \ 3272 "Number of methods to record in call profile") \ 3273 \ 3274 develop(intx, BciProfileWidth, 2, \ 3275 "Number of return bci's to record in ret profile") \ 3276 \ 3277 product(intx, PerMethodRecompilationCutoff, 400, \ 3278 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3279 range(-1, max_intx) \ 3280 \ 3281 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3282 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3283 range(-1, max_intx) \ 3284 \ 3285 product(intx, PerMethodTrapLimit, 100, \ 3286 "Limit on traps (of one kind) in a method (includes inlines)") \ 3287 range(0, max_jint) \ 3288 \ 3289 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3290 "Limit on speculative traps (of one kind) in a method " \ 3291 "(includes inlines)") \ 3292 range(0, max_jint) \ 3293 \ 3294 product(intx, PerBytecodeTrapLimit, 4, \ 3295 "Limit on traps (of one kind) at a particular BCI") \ 3296 range(0, max_jint) \ 3297 \ 3298 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3299 "Extra method data trap entries for speculation") \ 3300 \ 3301 develop(intx, InlineFrequencyRatio, 20, \ 3302 "Ratio of call site execution to caller method invocation") \ 3303 range(0, max_jint) \ 3304 \ 3305 develop_pd(intx, InlineFrequencyCount, \ 3306 "Count of call site execution necessary to trigger frequent " \ 3307 "inlining") \ 3308 range(0, max_jint) \ 3309 \ 3310 develop(intx, InlineThrowCount, 50, \ 3311 "Force inlining of interpreted methods that throw this often") \ 3312 range(0, max_jint) \ 3313 \ 3314 develop(intx, InlineThrowMaxSize, 200, \ 3315 "Force inlining of throwing methods smaller than this") \ 3316 range(0, max_jint) \ 3317 \ 3318 develop(intx, ProfilerNodeSize, 1024, \ 3319 "Size in K to allocate for the Profile Nodes of each thread") \ 3320 range(0, 1024) \ 3321 \ 3322 /* gc parameters */ \ 3323 product(size_t, InitialHeapSize, 0, \ 3324 "Initial heap size (in bytes); zero means use ergonomics") \ 3325 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3326 \ 3327 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3328 "Maximum heap size (in bytes)") \ 3329 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3330 \ 3331 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3332 "Initial tenured generation size (in bytes)") \ 3333 \ 3334 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3335 "Initial new generation size (in bytes)") \ 3336 constraint(NewSizeConstraintFunc,AfterErgo) \ 3337 \ 3338 product(size_t, MaxNewSize, max_uintx, \ 3339 "Maximum new generation size (in bytes), max_uintx means set " \ 3340 "ergonomically") \ 3341 \ 3342 product(size_t, PretenureSizeThreshold, 0, \ 3343 "Maximum size in bytes of objects allocated in DefNew " \ 3344 "generation; zero means no maximum") \ 3345 \ 3346 product(size_t, MinTLABSize, 2*K, \ 3347 "Minimum allowed TLAB size (in bytes)") \ 3348 range(1, max_uintx) \ 3349 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3350 \ 3351 product(size_t, TLABSize, 0, \ 3352 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3353 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3354 \ 3355 product(size_t, YoungPLABSize, 4096, \ 3356 "Size of young gen promotion LAB's (in HeapWords)") \ 3357 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3358 \ 3359 product(size_t, OldPLABSize, 1024, \ 3360 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3361 "of blocks to attempt to claim when refilling CMS LAB's") \ 3362 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3363 \ 3364 product(uintx, TLABAllocationWeight, 35, \ 3365 "Allocation averaging weight") \ 3366 range(0, 100) \ 3367 \ 3368 /* Limit the lower bound of this flag to 1 as it is used */ \ 3369 /* in a division expression. */ \ 3370 product(uintx, TLABWasteTargetPercent, 1, \ 3371 "Percentage of Eden that can be wasted") \ 3372 range(1, 100) \ 3373 \ 3374 product(uintx, TLABRefillWasteFraction, 64, \ 3375 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3376 range(1, max_uintx) \ 3377 \ 3378 product(uintx, TLABWasteIncrement, 4, \ 3379 "Increment allowed waste at slow allocation") \ 3380 \ 3381 product(uintx, SurvivorRatio, 8, \ 3382 "Ratio of eden/survivor space size") \ 3383 range(1, max_uintx-2) \ 3384 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3385 \ 3386 product(uintx, NewRatio, 2, \ 3387 "Ratio of old/new generation sizes") \ 3388 range(0, max_uintx-1) \ 3389 \ 3390 product_pd(size_t, NewSizeThreadIncrease, \ 3391 "Additional size added to desired new generation size per " \ 3392 "non-daemon thread (in bytes)") \ 3393 \ 3394 product_pd(size_t, MetaspaceSize, \ 3395 "Initial size of Metaspaces (in bytes)") \ 3396 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3397 \ 3398 product(size_t, MaxMetaspaceSize, max_uintx, \ 3399 "Maximum size of Metaspaces (in bytes)") \ 3400 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3401 \ 3402 product(size_t, CompressedClassSpaceSize, 1*G, \ 3403 "Maximum size of class area in Metaspace when compressed " \ 3404 "class pointers are used") \ 3405 range(1*M, 3*G) \ 3406 \ 3407 manageable(uintx, MinHeapFreeRatio, 40, \ 3408 "The minimum percentage of heap free after GC to avoid expansion."\ 3409 " For most GCs this applies to the old generation. In G1 and" \ 3410 " ParallelGC it applies to the whole heap.") \ 3411 range(0, 100) \ 3412 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3413 \ 3414 manageable(uintx, MaxHeapFreeRatio, 70, \ 3415 "The maximum percentage of heap free after GC to avoid shrinking."\ 3416 " For most GCs this applies to the old generation. In G1 and" \ 3417 " ParallelGC it applies to the whole heap.") \ 3418 range(0, 100) \ 3419 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3420 \ 3421 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3422 "Number of milliseconds per MB of free space in the heap") \ 3423 range(0, max_intx) \ 3424 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3425 \ 3426 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3427 "The minimum change in heap space due to GC (in bytes)") \ 3428 \ 3429 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3430 "The minimum expansion of Metaspace (in bytes)") \ 3431 \ 3432 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3433 "The maximum percentage of Metaspace free after GC to avoid " \ 3434 "shrinking") \ 3435 range(0, 100) \ 3436 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3437 \ 3438 product(uintx, MinMetaspaceFreeRatio, 40, \ 3439 "The minimum percentage of Metaspace free after GC to avoid " \ 3440 "expansion") \ 3441 range(0, 99) \ 3442 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3443 \ 3444 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3445 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3446 \ 3447 product(uintx, QueuedAllocationWarningCount, 0, \ 3448 "Number of times an allocation that queues behind a GC " \ 3449 "will retry before printing a warning") \ 3450 \ 3451 diagnostic(uintx, VerifyGCStartAt, 0, \ 3452 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3453 \ 3454 diagnostic(intx, VerifyGCLevel, 0, \ 3455 "Generation level at which to start +VerifyBefore/AfterGC") \ 3456 range(0, 1) \ 3457 \ 3458 product(uintx, MaxTenuringThreshold, 15, \ 3459 "Maximum value for tenuring threshold") \ 3460 range(0, markOopDesc::max_age + 1) \ 3461 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3462 \ 3463 product(uintx, InitialTenuringThreshold, 7, \ 3464 "Initial value for tenuring threshold") \ 3465 range(0, markOopDesc::max_age + 1) \ 3466 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3467 \ 3468 product(uintx, TargetSurvivorRatio, 50, \ 3469 "Desired percentage of survivor space used after scavenge") \ 3470 range(0, 100) \ 3471 \ 3472 product(uintx, MarkSweepDeadRatio, 5, \ 3473 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3474 "Serial mark sweep treats this as both the minimum and maximum " \ 3475 "value. " \ 3476 "CMS uses this value only if it falls back to mark sweep. " \ 3477 "Par compact uses a variable scale based on the density of the " \ 3478 "generation and treats this as the maximum value when the heap " \ 3479 "is either completely full or completely empty. Par compact " \ 3480 "also has a smaller default value; see arguments.cpp.") \ 3481 range(0, 100) \ 3482 \ 3483 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3484 "How often should we fully compact the heap (ignoring the dead " \ 3485 "space parameters)") \ 3486 range(1, max_uintx) \ 3487 \ 3488 product(intx, PrintCMSStatistics, 0, \ 3489 "Statistics for CMS") \ 3490 \ 3491 product(bool, PrintCMSInitiationStatistics, false, \ 3492 "Statistics for initiating a CMS collection") \ 3493 \ 3494 product(intx, PrintFLSStatistics, 0, \ 3495 "Statistics for CMS' FreeListSpace") \ 3496 \ 3497 product(intx, PrintFLSCensus, 0, \ 3498 "Census for CMS' FreeListSpace") \ 3499 \ 3500 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3501 "Delay between expansion and allocation (in milliseconds)") \ 3502 \ 3503 develop(uintx, GCWorkerDelayMillis, 0, \ 3504 "Delay in scheduling GC workers (in milliseconds)") \ 3505 \ 3506 product(intx, DeferThrSuspendLoopCount, 4000, \ 3507 "(Unstable) Number of times to iterate in safepoint loop " \ 3508 "before blocking VM threads ") \ 3509 range(-1, max_jint-1) \ 3510 \ 3511 product(intx, DeferPollingPageLoopCount, -1, \ 3512 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3513 "before changing safepoint polling page to RO ") \ 3514 range(-1, max_jint-1) \ 3515 \ 3516 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3517 range(0, max_intx) \ 3518 \ 3519 product(bool, PSChunkLargeArrays, true, \ 3520 "Process large arrays in chunks") \ 3521 \ 3522 product(uintx, GCDrainStackTargetSize, 64, \ 3523 "Number of entries we will try to leave on the stack " \ 3524 "during parallel gc") \ 3525 \ 3526 /* stack parameters */ \ 3527 product_pd(intx, StackYellowPages, \ 3528 "Number of yellow zone (recoverable overflows) pages") \ 3529 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3530 \ 3531 product_pd(intx, StackRedPages, \ 3532 "Number of red zone (unrecoverable overflows) pages") \ 3533 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3534 \ 3535 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3536 product_pd(intx, StackShadowPages, \ 3537 "Number of shadow zone (for overflow checking) pages " \ 3538 "this should exceed the depth of the VM and native call stack") \ 3539 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3540 \ 3541 product_pd(intx, ThreadStackSize, \ 3542 "Thread Stack Size (in Kbytes)") \ 3543 range(0, max_intx-os::vm_page_size()) \ 3544 \ 3545 product_pd(intx, VMThreadStackSize, \ 3546 "Non-Java Thread Stack Size (in Kbytes)") \ 3547 range(0, max_intx/(1 * K)) \ 3548 \ 3549 product_pd(intx, CompilerThreadStackSize, \ 3550 "Compiler Thread Stack Size (in Kbytes)") \ 3551 range(0, max_intx) \ 3552 \ 3553 develop_pd(size_t, JVMInvokeMethodSlack, \ 3554 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3555 \ 3556 /* code cache parameters */ \ 3557 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3558 develop(uintx, CodeCacheSegmentSize, \ 3559 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \ 3560 "Code cache segment size (in bytes) - smallest unit of " \ 3561 "allocation") \ 3562 range(1, 1024) \ 3563 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3564 \ 3565 develop_pd(intx, CodeEntryAlignment, \ 3566 "Code entry alignment for generated code (in bytes)") \ 3567 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3568 \ 3569 product_pd(intx, OptoLoopAlignment, \ 3570 "Align inner loops to zero relative to this modulus") \ 3571 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3572 \ 3573 product_pd(uintx, InitialCodeCacheSize, \ 3574 "Initial code cache size (in bytes)") \ 3575 range(0, max_uintx) \ 3576 \ 3577 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3578 "Minimum code cache size (in bytes) required to start VM.") \ 3579 range(0, max_uintx) \ 3580 \ 3581 product(bool, SegmentedCodeCache, false, \ 3582 "Use a segmented code cache") \ 3583 \ 3584 product_pd(uintx, ReservedCodeCacheSize, \ 3585 "Reserved code cache size (in bytes) - maximum code cache size") \ 3586 range(0, max_uintx) \ 3587 \ 3588 product_pd(uintx, NonProfiledCodeHeapSize, \ 3589 "Size of code heap with non-profiled methods (in bytes)") \ 3590 range(0, max_uintx) \ 3591 \ 3592 product_pd(uintx, ProfiledCodeHeapSize, \ 3593 "Size of code heap with profiled methods (in bytes)") \ 3594 range(0, max_uintx) \ 3595 \ 3596 product_pd(uintx, NonNMethodCodeHeapSize, \ 3597 "Size of code heap with non-nmethods (in bytes)") \ 3598 range(0, max_uintx) \ 3599 \ 3600 product_pd(uintx, CodeCacheExpansionSize, \ 3601 "Code cache expansion size (in bytes)") \ 3602 range(0, max_uintx) \ 3603 \ 3604 develop_pd(uintx, CodeCacheMinBlockLength, \ 3605 "Minimum number of segments in a code cache block") \ 3606 range(1, 100) \ 3607 \ 3608 notproduct(bool, ExitOnFullCodeCache, false, \ 3609 "Exit the VM if we fill the code cache") \ 3610 \ 3611 product(bool, UseCodeCacheFlushing, true, \ 3612 "Remove cold/old nmethods from the code cache") \ 3613 \ 3614 product(uintx, StartAggressiveSweepingAt, 10, \ 3615 "Start aggressive sweeping if X[%] of the code cache is free." \ 3616 "Segmented code cache: X[%] of the non-profiled heap." \ 3617 "Non-segmented code cache: X[%] of the total code cache") \ 3618 range(0, 100) \ 3619 \ 3620 /* interpreter debugging */ \ 3621 develop(intx, BinarySwitchThreshold, 5, \ 3622 "Minimal number of lookupswitch entries for rewriting to binary " \ 3623 "switch") \ 3624 \ 3625 develop(intx, StopInterpreterAt, 0, \ 3626 "Stop interpreter execution at specified bytecode number") \ 3627 \ 3628 develop(intx, TraceBytecodesAt, 0, \ 3629 "Trace bytecodes starting with specified bytecode number") \ 3630 \ 3631 /* compiler interface */ \ 3632 develop(intx, CIStart, 0, \ 3633 "The id of the first compilation to permit") \ 3634 \ 3635 develop(intx, CIStop, max_jint, \ 3636 "The id of the last compilation to permit") \ 3637 \ 3638 develop(intx, CIStartOSR, 0, \ 3639 "The id of the first osr compilation to permit " \ 3640 "(CICountOSR must be on)") \ 3641 \ 3642 develop(intx, CIStopOSR, max_jint, \ 3643 "The id of the last osr compilation to permit " \ 3644 "(CICountOSR must be on)") \ 3645 \ 3646 develop(intx, CIBreakAtOSR, -1, \ 3647 "The id of osr compilation to break at") \ 3648 \ 3649 develop(intx, CIBreakAt, -1, \ 3650 "The id of compilation to break at") \ 3651 \ 3652 product(ccstrlist, CompileOnly, "", \ 3653 "List of methods (pkg/class.name) to restrict compilation to") \ 3654 \ 3655 product(ccstr, CompileCommandFile, NULL, \ 3656 "Read compiler commands from this file [.hotspot_compiler]") \ 3657 \ 3658 product(ccstrlist, CompileCommand, "", \ 3659 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3660 \ 3661 develop(bool, ReplayCompiles, false, \ 3662 "Enable replay of compilations from ReplayDataFile") \ 3663 \ 3664 product(ccstr, ReplayDataFile, NULL, \ 3665 "File containing compilation replay information" \ 3666 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3667 \ 3668 product(ccstr, InlineDataFile, NULL, \ 3669 "File containing inlining replay information" \ 3670 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3671 \ 3672 develop(intx, ReplaySuppressInitializers, 2, \ 3673 "Control handling of class initialization during replay: " \ 3674 "0 - don't do anything special; " \ 3675 "1 - treat all class initializers as empty; " \ 3676 "2 - treat class initializers for application classes as empty; " \ 3677 "3 - allow all class initializers to run during bootstrap but " \ 3678 " pretend they are empty after starting replay") \ 3679 range(0, 3) \ 3680 \ 3681 develop(bool, ReplayIgnoreInitErrors, false, \ 3682 "Ignore exceptions thrown during initialization for replay") \ 3683 \ 3684 product(bool, DumpReplayDataOnError, true, \ 3685 "Record replay data for crashing compiler threads") \ 3686 \ 3687 product(bool, CICompilerCountPerCPU, false, \ 3688 "1 compiler thread for log(N CPUs)") \ 3689 \ 3690 develop(intx, CIFireOOMAt, -1, \ 3691 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3692 "(non-negative value throws OOM after this many CI accesses " \ 3693 "in each compile)") \ 3694 notproduct(intx, CICrashAt, -1, \ 3695 "id of compilation to trigger assert in compiler thread for " \ 3696 "the purpose of testing, e.g. generation of replay data") \ 3697 notproduct(bool, CIObjectFactoryVerify, false, \ 3698 "enable potentially expensive verification in ciObjectFactory") \ 3699 \ 3700 /* Priorities */ \ 3701 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3702 \ 3703 product(intx, ThreadPriorityPolicy, 0, \ 3704 "0 : Normal. "\ 3705 " VM chooses priorities that are appropriate for normal "\ 3706 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3707 " to normal native priority. Java priorities below " \ 3708 " NORM_PRIORITY map to lower native priority values. On "\ 3709 " Windows applications are allowed to use higher native "\ 3710 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3711 " not use the highest possible native priority, "\ 3712 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3713 " system threads. On Linux thread priorities are ignored "\ 3714 " because the OS does not support static priority in "\ 3715 " SCHED_OTHER scheduling class which is the only choice for "\ 3716 " non-root, non-realtime applications. "\ 3717 "1 : Aggressive. "\ 3718 " Java thread priorities map over to the entire range of "\ 3719 " native thread priorities. Higher Java thread priorities map "\ 3720 " to higher native thread priorities. This policy should be "\ 3721 " used with care, as sometimes it can cause performance "\ 3722 " degradation in the application and/or the entire system. On "\ 3723 " Linux this policy requires root privilege.") \ 3724 range(0, 1) \ 3725 \ 3726 product(bool, ThreadPriorityVerbose, false, \ 3727 "Print priority changes") \ 3728 \ 3729 product(intx, CompilerThreadPriority, -1, \ 3730 "The native priority at which compiler threads should run " \ 3731 "(-1 means no change)") \ 3732 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3733 \ 3734 product(intx, VMThreadPriority, -1, \ 3735 "The native priority at which the VM thread should run " \ 3736 "(-1 means no change)") \ 3737 range(-1, 127) \ 3738 \ 3739 product(bool, CompilerThreadHintNoPreempt, true, \ 3740 "(Solaris only) Give compiler threads an extra quanta") \ 3741 \ 3742 product(bool, VMThreadHintNoPreempt, false, \ 3743 "(Solaris only) Give VM thread an extra quanta") \ 3744 \ 3745 product(intx, JavaPriority1_To_OSPriority, -1, \ 3746 "Map Java priorities to OS priorities") \ 3747 range(-1, 127) \ 3748 \ 3749 product(intx, JavaPriority2_To_OSPriority, -1, \ 3750 "Map Java priorities to OS priorities") \ 3751 range(-1, 127) \ 3752 \ 3753 product(intx, JavaPriority3_To_OSPriority, -1, \ 3754 "Map Java priorities to OS priorities") \ 3755 range(-1, 127) \ 3756 \ 3757 product(intx, JavaPriority4_To_OSPriority, -1, \ 3758 "Map Java priorities to OS priorities") \ 3759 range(-1, 127) \ 3760 \ 3761 product(intx, JavaPriority5_To_OSPriority, -1, \ 3762 "Map Java priorities to OS priorities") \ 3763 range(-1, 127) \ 3764 \ 3765 product(intx, JavaPriority6_To_OSPriority, -1, \ 3766 "Map Java priorities to OS priorities") \ 3767 range(-1, 127) \ 3768 \ 3769 product(intx, JavaPriority7_To_OSPriority, -1, \ 3770 "Map Java priorities to OS priorities") \ 3771 range(-1, 127) \ 3772 \ 3773 product(intx, JavaPriority8_To_OSPriority, -1, \ 3774 "Map Java priorities to OS priorities") \ 3775 range(-1, 127) \ 3776 \ 3777 product(intx, JavaPriority9_To_OSPriority, -1, \ 3778 "Map Java priorities to OS priorities") \ 3779 range(-1, 127) \ 3780 \ 3781 product(intx, JavaPriority10_To_OSPriority,-1, \ 3782 "Map Java priorities to OS priorities") \ 3783 range(-1, 127) \ 3784 \ 3785 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3786 "Java thread priority 10 maps to critical scheduling priority") \ 3787 \ 3788 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3789 "Compiler thread(s) run at critical scheduling priority") \ 3790 \ 3791 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3792 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3793 \ 3794 /* compiler debugging */ \ 3795 notproduct(intx, CompileTheWorldStartAt, 1, \ 3796 "First class to consider when using +CompileTheWorld") \ 3797 \ 3798 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3799 "Last class to consider when using +CompileTheWorld") \ 3800 \ 3801 develop(intx, NewCodeParameter, 0, \ 3802 "Testing Only: Create a dedicated integer parameter before " \ 3803 "putback") \ 3804 \ 3805 /* new oopmap storage allocation */ \ 3806 develop(intx, MinOopMapAllocation, 8, \ 3807 "Minimum number of OopMap entries in an OopMapSet") \ 3808 \ 3809 /* Background Compilation */ \ 3810 develop(intx, LongCompileThreshold, 50, \ 3811 "Used with +TraceLongCompiles") \ 3812 \ 3813 /* recompilation */ \ 3814 product_pd(intx, CompileThreshold, \ 3815 "number of interpreted method invocations before (re-)compiling") \ 3816 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3817 \ 3818 product(double, CompileThresholdScaling, 1.0, \ 3819 "Factor to control when first compilation happens " \ 3820 "(both with and without tiered compilation): " \ 3821 "values greater than 1.0 delay counter overflow, " \ 3822 "values between 0 and 1.0 rush counter overflow, " \ 3823 "value of 1.0 leaves compilation thresholds unchanged " \ 3824 "value of 0.0 is equivalent to -Xint. " \ 3825 "" \ 3826 "Flag can be set as per-method option. " \ 3827 "If a value is specified for a method, compilation thresholds " \ 3828 "for that method are scaled by both the value of the global flag "\ 3829 "and the value of the per-method flag.") \ 3830 range(0.0, DBL_MAX) \ 3831 \ 3832 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3833 "Interpreter (tier 0) invocation notification frequency") \ 3834 range(0, 30) \ 3835 \ 3836 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3837 "C1 without MDO (tier 2) invocation notification frequency") \ 3838 range(0, 30) \ 3839 \ 3840 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3841 "C1 with MDO profiling (tier 3) invocation notification " \ 3842 "frequency") \ 3843 range(0, 30) \ 3844 \ 3845 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3846 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3847 range(0, 30) \ 3848 \ 3849 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3850 "Interpreter (tier 0) invocation notification frequency") \ 3851 range(0, 30) \ 3852 \ 3853 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3854 "C1 without MDO (tier 2) invocation notification frequency") \ 3855 range(0, 30) \ 3856 \ 3857 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3858 "C1 with MDO profiling (tier 3) invocation notification " \ 3859 "frequency") \ 3860 range(0, 30) \ 3861 \ 3862 product(intx, Tier2CompileThreshold, 0, \ 3863 "threshold at which tier 2 compilation is invoked") \ 3864 range(0, max_jint) \ 3865 \ 3866 product(intx, Tier2BackEdgeThreshold, 0, \ 3867 "Back edge threshold at which tier 2 compilation is invoked") \ 3868 range(0, max_jint) \ 3869 \ 3870 product(intx, Tier3InvocationThreshold, 200, \ 3871 "Compile if number of method invocations crosses this " \ 3872 "threshold") \ 3873 range(0, max_jint) \ 3874 \ 3875 product(intx, Tier3MinInvocationThreshold, 100, \ 3876 "Minimum invocation to compile at tier 3") \ 3877 range(0, max_jint) \ 3878 \ 3879 product(intx, Tier3CompileThreshold, 2000, \ 3880 "Threshold at which tier 3 compilation is invoked (invocation " \ 3881 "minimum must be satisfied)") \ 3882 range(0, max_jint) \ 3883 \ 3884 product(intx, Tier3BackEdgeThreshold, 60000, \ 3885 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3886 range(0, max_jint) \ 3887 \ 3888 product(intx, Tier4InvocationThreshold, 5000, \ 3889 "Compile if number of method invocations crosses this " \ 3890 "threshold") \ 3891 range(0, max_jint) \ 3892 \ 3893 product(intx, Tier4MinInvocationThreshold, 600, \ 3894 "Minimum invocation to compile at tier 4") \ 3895 range(0, max_jint) \ 3896 \ 3897 product(intx, Tier4CompileThreshold, 15000, \ 3898 "Threshold at which tier 4 compilation is invoked (invocation " \ 3899 "minimum must be satisfied") \ 3900 range(0, max_jint) \ 3901 \ 3902 product(intx, Tier4BackEdgeThreshold, 40000, \ 3903 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3904 range(0, max_jint) \ 3905 \ 3906 product(intx, Tier3DelayOn, 5, \ 3907 "If C2 queue size grows over this amount per compiler thread " \ 3908 "stop compiling at tier 3 and start compiling at tier 2") \ 3909 range(0, max_jint) \ 3910 \ 3911 product(intx, Tier3DelayOff, 2, \ 3912 "If C2 queue size is less than this amount per compiler thread " \ 3913 "allow methods compiled at tier 2 transition to tier 3") \ 3914 range(0, max_jint) \ 3915 \ 3916 product(intx, Tier3LoadFeedback, 5, \ 3917 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3918 "reaches this amount per compiler thread") \ 3919 range(0, max_jint) \ 3920 \ 3921 product(intx, Tier4LoadFeedback, 3, \ 3922 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3923 "reaches this amount per compiler thread") \ 3924 range(0, max_jint) \ 3925 \ 3926 product(intx, TieredCompileTaskTimeout, 50, \ 3927 "Kill compile task if method was not used within " \ 3928 "given timeout in milliseconds") \ 3929 range(0, max_intx) \ 3930 \ 3931 product(intx, TieredStopAtLevel, 4, \ 3932 "Stop at given compilation level") \ 3933 range(0, 4) \ 3934 \ 3935 product(intx, Tier0ProfilingStartPercentage, 200, \ 3936 "Start profiling in interpreter if the counters exceed tier 3 " \ 3937 "thresholds by the specified percentage") \ 3938 range(0, max_jint) \ 3939 \ 3940 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3941 "Increase the compile threshold for C1 compilation if the code " \ 3942 "cache is filled by the specified percentage") \ 3943 range(0, 99) \ 3944 \ 3945 product(intx, TieredRateUpdateMinTime, 1, \ 3946 "Minimum rate sampling interval (in milliseconds)") \ 3947 range(0, max_intx) \ 3948 \ 3949 product(intx, TieredRateUpdateMaxTime, 25, \ 3950 "Maximum rate sampling interval (in milliseconds)") \ 3951 range(0, max_intx) \ 3952 \ 3953 product_pd(bool, TieredCompilation, \ 3954 "Enable tiered compilation") \ 3955 \ 3956 product(bool, PrintTieredEvents, false, \ 3957 "Print tiered events notifications") \ 3958 \ 3959 product_pd(intx, OnStackReplacePercentage, \ 3960 "NON_TIERED number of method invocations/branches (expressed as " \ 3961 "% of CompileThreshold) before (re-)compiling OSR code") \ 3962 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3963 \ 3964 product(intx, InterpreterProfilePercentage, 33, \ 3965 "NON_TIERED number of method invocations/branches (expressed as " \ 3966 "% of CompileThreshold) before profiling in the interpreter") \ 3967 range(0, 100) \ 3968 \ 3969 develop(intx, MaxRecompilationSearchLength, 10, \ 3970 "The maximum number of frames to inspect when searching for " \ 3971 "recompilee") \ 3972 \ 3973 develop(intx, MaxInterpretedSearchLength, 3, \ 3974 "The maximum number of interpreted frames to skip when searching "\ 3975 "for recompilee") \ 3976 \ 3977 develop(intx, DesiredMethodLimit, 8000, \ 3978 "The desired maximum method size (in bytecodes) after inlining") \ 3979 \ 3980 develop(intx, HugeMethodLimit, 8000, \ 3981 "Don't compile methods larger than this if " \ 3982 "+DontCompileHugeMethods") \ 3983 \ 3984 /* New JDK 1.4 reflection implementation */ \ 3985 \ 3986 develop(intx, FastSuperclassLimit, 8, \ 3987 "Depth of hardwired instanceof accelerator array") \ 3988 \ 3989 /* Properties for Java libraries */ \ 3990 \ 3991 product(size_t, MaxDirectMemorySize, 0, \ 3992 "Maximum total size of NIO direct-buffer allocations") \ 3993 range(0, (size_t)SIZE_MAX) \ 3994 \ 3995 /* Flags used for temporary code during development */ \ 3996 \ 3997 diagnostic(bool, UseNewCode, false, \ 3998 "Testing Only: Use the new version while testing") \ 3999 \ 4000 diagnostic(bool, UseNewCode2, false, \ 4001 "Testing Only: Use the new version while testing") \ 4002 \ 4003 diagnostic(bool, UseNewCode3, false, \ 4004 "Testing Only: Use the new version while testing") \ 4005 \ 4006 /* flags for performance data collection */ \ 4007 \ 4008 product(bool, UsePerfData, falseInEmbedded, \ 4009 "Flag to disable jvmstat instrumentation for performance testing "\ 4010 "and problem isolation purposes") \ 4011 \ 4012 product(bool, PerfDataSaveToFile, false, \ 4013 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 4014 \ 4015 product(ccstr, PerfDataSaveFile, NULL, \ 4016 "Save PerfData memory to the specified absolute pathname. " \ 4017 "The string %p in the file name (if present) " \ 4018 "will be replaced by pid") \ 4019 \ 4020 product(intx, PerfDataSamplingInterval, 50, \ 4021 "Data sampling interval (in milliseconds)") \ 4022 range(PeriodicTask::min_interval, max_jint) \ 4023 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 4024 \ 4025 develop(bool, PerfTraceDataCreation, false, \ 4026 "Trace creation of Performance Data Entries") \ 4027 \ 4028 develop(bool, PerfTraceMemOps, false, \ 4029 "Trace PerfMemory create/attach/detach calls") \ 4030 \ 4031 product(bool, PerfDisableSharedMem, false, \ 4032 "Store performance data in standard memory") \ 4033 \ 4034 product(intx, PerfDataMemorySize, 64*K, \ 4035 "Size of performance data memory region. Will be rounded " \ 4036 "up to a multiple of the native os page size.") \ 4037 range(128, 32*64*K) \ 4038 \ 4039 product(intx, PerfMaxStringConstLength, 1024, \ 4040 "Maximum PerfStringConstant string length before truncation") \ 4041 range(32, 32*K) \ 4042 \ 4043 product(bool, PerfAllowAtExitRegistration, false, \ 4044 "Allow registration of atexit() methods") \ 4045 \ 4046 product(bool, PerfBypassFileSystemCheck, false, \ 4047 "Bypass Win32 file system criteria checks (Windows Only)") \ 4048 \ 4049 product(intx, UnguardOnExecutionViolation, 0, \ 4050 "Unguard page and retry on no-execute fault (Win32 only) " \ 4051 "0=off, 1=conservative, 2=aggressive") \ 4052 range(0, 2) \ 4053 \ 4054 /* Serviceability Support */ \ 4055 \ 4056 product(bool, ManagementServer, false, \ 4057 "Create JMX Management Server") \ 4058 \ 4059 product(bool, DisableAttachMechanism, false, \ 4060 "Disable mechanism that allows tools to attach to this VM") \ 4061 \ 4062 product(bool, StartAttachListener, false, \ 4063 "Always start Attach Listener at VM startup") \ 4064 \ 4065 manageable(bool, PrintConcurrentLocks, false, \ 4066 "Print java.util.concurrent locks in thread dump") \ 4067 \ 4068 product(bool, TransmitErrorReport, false, \ 4069 "Enable error report transmission on erroneous termination") \ 4070 \ 4071 product(ccstr, ErrorReportServer, NULL, \ 4072 "Override built-in error report server address") \ 4073 \ 4074 /* Shared spaces */ \ 4075 \ 4076 product(bool, UseSharedSpaces, true, \ 4077 "Use shared spaces for metadata") \ 4078 \ 4079 product(bool, VerifySharedSpaces, false, \ 4080 "Verify shared spaces (false for default archive, true for " \ 4081 "archive specified by -XX:SharedArchiveFile)") \ 4082 \ 4083 product(bool, RequireSharedSpaces, false, \ 4084 "Require shared spaces for metadata") \ 4085 \ 4086 product(bool, DumpSharedSpaces, false, \ 4087 "Special mode: JVM reads a class list, loads classes, builds " \ 4088 "shared spaces, and dumps the shared spaces to a file to be " \ 4089 "used in future JVM runs") \ 4090 \ 4091 product(bool, PrintSharedSpaces, false, \ 4092 "Print usage of shared spaces") \ 4093 \ 4094 product(bool, PrintSharedArchiveAndExit, false, \ 4095 "Print shared archive file contents") \ 4096 \ 4097 product(bool, PrintSharedDictionary, false, \ 4098 "If PrintSharedArchiveAndExit is true, also print the shared " \ 4099 "dictionary") \ 4100 \ 4101 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 4102 "Size of read-write space for metadata (in bytes)") \ 4103 \ 4104 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 4105 "Size of read-only space for metadata (in bytes)") \ 4106 \ 4107 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 4108 "Size of the shared miscellaneous data area (in bytes)") \ 4109 \ 4110 product(uintx, SharedMiscCodeSize, 120*K, \ 4111 "Size of the shared miscellaneous code area (in bytes)") \ 4112 \ 4113 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 4114 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 4115 "Address to allocate shared memory region for class data") \ 4116 \ 4117 product(uintx, SharedSymbolTableBucketSize, 4, \ 4118 "Average number of symbols per bucket in shared table") \ 4119 range(2, 246) \ 4120 \ 4121 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 4122 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 4123 "classes. Just exclude them from the shared dictionary.") \ 4124 \ 4125 diagnostic(bool, PrintMethodHandleStubs, false, \ 4126 "Print generated stub code for method handles") \ 4127 \ 4128 develop(bool, TraceMethodHandles, false, \ 4129 "trace internal method handle operations") \ 4130 \ 4131 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4132 "perform extra checks when constructing method handles") \ 4133 \ 4134 diagnostic(bool, ShowHiddenFrames, false, \ 4135 "show method handle implementation frames (usually hidden)") \ 4136 \ 4137 experimental(bool, TrustFinalNonStaticFields, false, \ 4138 "trust final non-static declarations for constant folding") \ 4139 \ 4140 diagnostic(bool, FoldStableValues, true, \ 4141 "Optimize loads from stable fields (marked w/ @Stable)") \ 4142 \ 4143 develop(bool, TraceInvokeDynamic, false, \ 4144 "trace internal invoke dynamic operations") \ 4145 \ 4146 diagnostic(bool, PauseAtStartup, false, \ 4147 "Causes the VM to pause at startup time and wait for the pause " \ 4148 "file to be removed (default: ./vm.paused.<pid>)") \ 4149 \ 4150 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4151 "The file to create and for whose removal to await when pausing " \ 4152 "at startup. (default: ./vm.paused.<pid>)") \ 4153 \ 4154 diagnostic(bool, PauseAtExit, false, \ 4155 "Pause and wait for keypress on exit if a debugger is attached") \ 4156 \ 4157 product(bool, ExtendedDTraceProbes, false, \ 4158 "Enable performance-impacting dtrace probes") \ 4159 \ 4160 product(bool, DTraceMethodProbes, false, \ 4161 "Enable dtrace probes for method-entry and method-exit") \ 4162 \ 4163 product(bool, DTraceAllocProbes, false, \ 4164 "Enable dtrace probes for object allocation") \ 4165 \ 4166 product(bool, DTraceMonitorProbes, false, \ 4167 "Enable dtrace probes for monitor events") \ 4168 \ 4169 product(bool, RelaxAccessControlCheck, false, \ 4170 "Relax the access control checks in the verifier") \ 4171 \ 4172 product(uintx, StringTableSize, defaultStringTableSize, \ 4173 "Number of buckets in the interned String table") \ 4174 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4175 \ 4176 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4177 "Number of buckets in the JVM internal Symbol table") \ 4178 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4179 \ 4180 product(bool, UseStringDeduplication, false, \ 4181 "Use string deduplication") \ 4182 \ 4183 product(bool, PrintStringDeduplicationStatistics, false, \ 4184 "Print string deduplication statistics") \ 4185 \ 4186 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4187 "A string must reach this age (or be promoted to an old region) " \ 4188 "to be considered for deduplication") \ 4189 range(1, markOopDesc::max_age) \ 4190 \ 4191 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4192 "Force table resize every time the table is scanned") \ 4193 \ 4194 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4195 "Force table rehash every time the table is scanned") \ 4196 \ 4197 develop(bool, TraceDefaultMethods, false, \ 4198 "Trace the default method processing steps") \ 4199 \ 4200 diagnostic(bool, WhiteBoxAPI, false, \ 4201 "Enable internal testing APIs") \ 4202 \ 4203 product(bool, PrintGCCause, true, \ 4204 "Include GC cause in GC logging") \ 4205 \ 4206 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4207 "Default survivor space alignment in bytes") \ 4208 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4209 \ 4210 product(bool , AllowNonVirtualCalls, false, \ 4211 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4212 \ 4213 product(ccstr, DumpLoadedClassList, NULL, \ 4214 "Dump the names all loaded classes, that could be stored into " \ 4215 "the CDS archive, in the specified file") \ 4216 \ 4217 product(ccstr, SharedClassListFile, NULL, \ 4218 "Override the default CDS class list") \ 4219 \ 4220 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4221 "Override the default location of the CDS archive file") \ 4222 \ 4223 product(ccstr, ExtraSharedClassListFile, NULL, \ 4224 "Extra classlist for building the CDS archive file") \ 4225 \ 4226 experimental(size_t, ArrayAllocatorMallocLimit, \ 4227 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4228 "Allocation less than this value will be allocated " \ 4229 "using malloc. Larger allocations will use mmap.") \ 4230 \ 4231 experimental(bool, AlwaysAtomicAccesses, false, \ 4232 "Accesses to all variables should always be atomic") \ 4233 \ 4234 product(bool, EnableTracing, false, \ 4235 "Enable event-based tracing") \ 4236 \ 4237 product(bool, UseLockedTracing, false, \ 4238 "Use locked-tracing when doing event-based tracing") \ 4239 \ 4240 diagnostic(bool, UseUnalignedAccesses, false, \ 4241 "Use unaligned memory accesses in Unsafe") \ 4242 \ 4243 product_pd(bool, PreserveFramePointer, \ 4244 "Use the FP register for holding the frame pointer " \ 4245 "and not as a general purpose register.") \ 4246 \ 4247 diagnostic(bool, CheckIntrinsics, true, \ 4248 "When a class C is loaded, check that " \ 4249 "(1) all intrinsics defined by the VM for class C are present "\ 4250 "in the loaded class file and are marked with the " \ 4251 "@HotSpotIntrinsicCandidate annotation, that " \ 4252 "(2) there is an intrinsic registered for all loaded methods " \ 4253 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4254 "annotation, and that " \ 4255 "(3) no orphan methods exist for class C (i.e., methods for " \ 4256 "which the VM declares an intrinsic but that are not declared "\ 4257 "in the loaded class C. " \ 4258 "Check (3) is available only in debug builds.") 4259 4260/* 4261 * Macros for factoring of globals 4262 */ 4263 4264// Interface macros 4265#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4266#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4267#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4268#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4269#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4270#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4271#ifdef PRODUCT 4272#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4273#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4274#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4275#else 4276#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4277#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4278#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4279#endif // PRODUCT 4280// Special LP64 flags, product only needed for now. 4281#ifdef _LP64 4282#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4283#else 4284#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4285#endif // _LP64 4286 4287// Implementation macros 4288#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4289#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4290#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4291#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4292#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4293#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4294#ifdef PRODUCT 4295#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4296#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4297#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4298#else 4299#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4300#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4301#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4302#endif // PRODUCT 4303#ifdef _LP64 4304#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4305#else 4306#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4307#endif // _LP64 4308 4309// Only materialize src code for range checking when required, ignore otherwise 4310#define IGNORE_RANGE(a, b) 4311// Only materialize src code for contraint checking when required, ignore otherwise 4312#define IGNORE_CONSTRAINT(func,type) 4313 4314RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4315 DECLARE_PD_DEVELOPER_FLAG, \ 4316 DECLARE_PRODUCT_FLAG, \ 4317 DECLARE_PD_PRODUCT_FLAG, \ 4318 DECLARE_DIAGNOSTIC_FLAG, \ 4319 DECLARE_EXPERIMENTAL_FLAG, \ 4320 DECLARE_NOTPRODUCT_FLAG, \ 4321 DECLARE_MANAGEABLE_FLAG, \ 4322 DECLARE_PRODUCT_RW_FLAG, \ 4323 DECLARE_LP64_PRODUCT_FLAG, \ 4324 IGNORE_RANGE, \ 4325 IGNORE_CONSTRAINT) 4326 4327RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4328 DECLARE_PD_DEVELOPER_FLAG, \ 4329 DECLARE_PRODUCT_FLAG, \ 4330 DECLARE_PD_PRODUCT_FLAG, \ 4331 DECLARE_DIAGNOSTIC_FLAG, \ 4332 DECLARE_NOTPRODUCT_FLAG, \ 4333 IGNORE_RANGE, \ 4334 IGNORE_CONSTRAINT) 4335 4336ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4337 DECLARE_PRODUCT_FLAG, \ 4338 DECLARE_DIAGNOSTIC_FLAG, \ 4339 DECLARE_EXPERIMENTAL_FLAG, \ 4340 DECLARE_NOTPRODUCT_FLAG, \ 4341 IGNORE_RANGE, \ 4342 IGNORE_CONSTRAINT) 4343 4344// Extensions 4345 4346#include "runtime/globals_ext.hpp" 4347 4348#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4349