globals.hpp revision 9688:cbc2d5fbdae1
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29#include <float.h> // for DBL_MAX 30 31// use this for flags that are true per default in the tiered build 32// but false in non-tiered builds, and vice versa 33#ifdef TIERED 34#define trueInTiered true 35#define falseInTiered false 36#else 37#define trueInTiered false 38#define falseInTiered true 39#endif 40 41#ifdef TARGET_ARCH_x86 42# include "globals_x86.hpp" 43#endif 44#ifdef TARGET_ARCH_sparc 45# include "globals_sparc.hpp" 46#endif 47#ifdef TARGET_ARCH_zero 48# include "globals_zero.hpp" 49#endif 50#ifdef TARGET_ARCH_arm 51# include "globals_arm.hpp" 52#endif 53#ifdef TARGET_ARCH_ppc 54# include "globals_ppc.hpp" 55#endif 56#ifdef TARGET_ARCH_aarch64 57# include "globals_aarch64.hpp" 58#endif 59#ifdef TARGET_OS_FAMILY_linux 60# include "globals_linux.hpp" 61#endif 62#ifdef TARGET_OS_FAMILY_solaris 63# include "globals_solaris.hpp" 64#endif 65#ifdef TARGET_OS_FAMILY_windows 66# include "globals_windows.hpp" 67#endif 68#ifdef TARGET_OS_FAMILY_aix 69# include "globals_aix.hpp" 70#endif 71#ifdef TARGET_OS_FAMILY_bsd 72# include "globals_bsd.hpp" 73#endif 74#ifdef TARGET_OS_ARCH_linux_x86 75# include "globals_linux_x86.hpp" 76#endif 77#ifdef TARGET_OS_ARCH_linux_sparc 78# include "globals_linux_sparc.hpp" 79#endif 80#ifdef TARGET_OS_ARCH_linux_zero 81# include "globals_linux_zero.hpp" 82#endif 83#ifdef TARGET_OS_ARCH_solaris_x86 84# include "globals_solaris_x86.hpp" 85#endif 86#ifdef TARGET_OS_ARCH_solaris_sparc 87# include "globals_solaris_sparc.hpp" 88#endif 89#ifdef TARGET_OS_ARCH_windows_x86 90# include "globals_windows_x86.hpp" 91#endif 92#ifdef TARGET_OS_ARCH_linux_arm 93# include "globals_linux_arm.hpp" 94#endif 95#ifdef TARGET_OS_ARCH_linux_ppc 96# include "globals_linux_ppc.hpp" 97#endif 98#ifdef TARGET_OS_ARCH_linux_aarch64 99# include "globals_linux_aarch64.hpp" 100#endif 101#ifdef TARGET_OS_ARCH_aix_ppc 102# include "globals_aix_ppc.hpp" 103#endif 104#ifdef TARGET_OS_ARCH_bsd_x86 105# include "globals_bsd_x86.hpp" 106#endif 107#ifdef TARGET_OS_ARCH_bsd_zero 108# include "globals_bsd_zero.hpp" 109#endif 110#ifdef COMPILER1 111#ifdef TARGET_ARCH_x86 112# include "c1_globals_x86.hpp" 113#endif 114#ifdef TARGET_ARCH_sparc 115# include "c1_globals_sparc.hpp" 116#endif 117#ifdef TARGET_ARCH_arm 118# include "c1_globals_arm.hpp" 119#endif 120#ifdef TARGET_ARCH_aarch64 121# include "c1_globals_aarch64.hpp" 122#endif 123#ifdef TARGET_OS_FAMILY_linux 124# include "c1_globals_linux.hpp" 125#endif 126#ifdef TARGET_OS_FAMILY_solaris 127# include "c1_globals_solaris.hpp" 128#endif 129#ifdef TARGET_OS_FAMILY_windows 130# include "c1_globals_windows.hpp" 131#endif 132#ifdef TARGET_OS_FAMILY_aix 133# include "c1_globals_aix.hpp" 134#endif 135#ifdef TARGET_OS_FAMILY_bsd 136# include "c1_globals_bsd.hpp" 137#endif 138#ifdef TARGET_ARCH_ppc 139# include "c1_globals_ppc.hpp" 140#endif 141#endif 142#ifdef COMPILER2 143#ifdef TARGET_ARCH_x86 144# include "c2_globals_x86.hpp" 145#endif 146#ifdef TARGET_ARCH_sparc 147# include "c2_globals_sparc.hpp" 148#endif 149#ifdef TARGET_ARCH_arm 150# include "c2_globals_arm.hpp" 151#endif 152#ifdef TARGET_ARCH_ppc 153# include "c2_globals_ppc.hpp" 154#endif 155#ifdef TARGET_ARCH_aarch64 156# include "c2_globals_aarch64.hpp" 157#endif 158#ifdef TARGET_OS_FAMILY_linux 159# include "c2_globals_linux.hpp" 160#endif 161#ifdef TARGET_OS_FAMILY_solaris 162# include "c2_globals_solaris.hpp" 163#endif 164#ifdef TARGET_OS_FAMILY_windows 165# include "c2_globals_windows.hpp" 166#endif 167#ifdef TARGET_OS_FAMILY_aix 168# include "c2_globals_aix.hpp" 169#endif 170#ifdef TARGET_OS_FAMILY_bsd 171# include "c2_globals_bsd.hpp" 172#endif 173#endif 174#ifdef SHARK 175#ifdef TARGET_ARCH_zero 176# include "shark_globals_zero.hpp" 177#endif 178#endif 179 180#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI 181define_pd_global(bool, BackgroundCompilation, false); 182define_pd_global(bool, UseTLAB, false); 183define_pd_global(bool, CICompileOSR, false); 184define_pd_global(bool, UseTypeProfile, false); 185define_pd_global(bool, UseOnStackReplacement, false); 186define_pd_global(bool, InlineIntrinsics, false); 187define_pd_global(bool, PreferInterpreterNativeStubs, true); 188define_pd_global(bool, ProfileInterpreter, false); 189define_pd_global(bool, ProfileTraps, false); 190define_pd_global(bool, TieredCompilation, false); 191 192define_pd_global(intx, CompileThreshold, 0); 193 194define_pd_global(intx, OnStackReplacePercentage, 0); 195define_pd_global(bool, ResizeTLAB, false); 196define_pd_global(intx, FreqInlineSize, 0); 197define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 198define_pd_global(intx, InlineClassNatives, true); 199define_pd_global(intx, InlineUnsafeOps, true); 200define_pd_global(intx, InitialCodeCacheSize, 160*K); 201define_pd_global(intx, ReservedCodeCacheSize, 32*M); 202define_pd_global(intx, NonProfiledCodeHeapSize, 0); 203define_pd_global(intx, ProfiledCodeHeapSize, 0); 204define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 205 206define_pd_global(intx, CodeCacheExpansionSize, 32*K); 207define_pd_global(intx, CodeCacheMinBlockLength, 1); 208define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 209define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 210define_pd_global(bool, NeverActAsServerClassMachine, true); 211define_pd_global(uint64_t,MaxRAM, 1ULL*G); 212#define CI_COMPILER_COUNT 0 213#else 214 215#if defined(COMPILER2) || INCLUDE_JVMCI 216#define CI_COMPILER_COUNT 2 217#else 218#define CI_COMPILER_COUNT 1 219#endif // COMPILER2 || INCLUDE_JVMCI 220 221#endif // no compilers 222 223// string type aliases used only in this file 224typedef const char* ccstr; 225typedef const char* ccstrlist; // represents string arguments which accumulate 226 227struct Flag { 228 enum Flags { 229 // value origin 230 DEFAULT = 0, 231 COMMAND_LINE = 1, 232 ENVIRON_VAR = 2, 233 CONFIG_FILE = 3, 234 MANAGEMENT = 4, 235 ERGONOMIC = 5, 236 ATTACH_ON_DEMAND = 6, 237 INTERNAL = 7, 238 239 LAST_VALUE_ORIGIN = INTERNAL, 240 VALUE_ORIGIN_BITS = 4, 241 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 242 243 // flag kind 244 KIND_PRODUCT = 1 << 4, 245 KIND_MANAGEABLE = 1 << 5, 246 KIND_DIAGNOSTIC = 1 << 6, 247 KIND_EXPERIMENTAL = 1 << 7, 248 KIND_NOT_PRODUCT = 1 << 8, 249 KIND_DEVELOP = 1 << 9, 250 KIND_PLATFORM_DEPENDENT = 1 << 10, 251 KIND_READ_WRITE = 1 << 11, 252 KIND_C1 = 1 << 12, 253 KIND_C2 = 1 << 13, 254 KIND_ARCH = 1 << 14, 255 KIND_SHARK = 1 << 15, 256 KIND_LP64_PRODUCT = 1 << 16, 257 KIND_COMMERCIAL = 1 << 17, 258 KIND_JVMCI = 1 << 18, 259 260 KIND_MASK = ~VALUE_ORIGIN_MASK 261 }; 262 263 enum Error { 264 // no error 265 SUCCESS = 0, 266 // flag name is missing 267 MISSING_NAME, 268 // flag value is missing 269 MISSING_VALUE, 270 // error parsing the textual form of the value 271 WRONG_FORMAT, 272 // flag is not writeable 273 NON_WRITABLE, 274 // flag value is outside of its bounds 275 OUT_OF_BOUNDS, 276 // flag value violates its constraint 277 VIOLATES_CONSTRAINT, 278 // there is no flag with the given name 279 INVALID_FLAG, 280 // other, unspecified error related to setting the flag 281 ERR_OTHER 282 }; 283 284 enum MsgType { 285 NONE = 0, 286 DIAGNOSTIC_FLAG_BUT_LOCKED, 287 EXPERIMENTAL_FLAG_BUT_LOCKED, 288 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 289 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 290 }; 291 292 const char* _type; 293 const char* _name; 294 void* _addr; 295 NOT_PRODUCT(const char* _doc;) 296 Flags _flags; 297 298 // points to all Flags static array 299 static Flag* flags; 300 301 // number of flags 302 static size_t numFlags; 303 304 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 305 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 306 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 307 308 void check_writable(); 309 310 bool is_bool() const; 311 bool get_bool() const; 312 void set_bool(bool value); 313 314 bool is_int() const; 315 int get_int() const; 316 void set_int(int value); 317 318 bool is_uint() const; 319 uint get_uint() const; 320 void set_uint(uint value); 321 322 bool is_intx() const; 323 intx get_intx() const; 324 void set_intx(intx value); 325 326 bool is_uintx() const; 327 uintx get_uintx() const; 328 void set_uintx(uintx value); 329 330 bool is_uint64_t() const; 331 uint64_t get_uint64_t() const; 332 void set_uint64_t(uint64_t value); 333 334 bool is_size_t() const; 335 size_t get_size_t() const; 336 void set_size_t(size_t value); 337 338 bool is_double() const; 339 double get_double() const; 340 void set_double(double value); 341 342 bool is_ccstr() const; 343 bool ccstr_accumulates() const; 344 ccstr get_ccstr() const; 345 void set_ccstr(ccstr value); 346 347 Flags get_origin(); 348 void set_origin(Flags origin); 349 350 bool is_default(); 351 bool is_ergonomic(); 352 bool is_command_line(); 353 354 bool is_product() const; 355 bool is_manageable() const; 356 bool is_diagnostic() const; 357 bool is_experimental() const; 358 bool is_notproduct() const; 359 bool is_develop() const; 360 bool is_read_write() const; 361 bool is_commercial() const; 362 363 bool is_constant_in_binary() const; 364 365 bool is_unlocker() const; 366 bool is_unlocked() const; 367 bool is_writeable() const; 368 bool is_external() const; 369 370 bool is_unlocker_ext() const; 371 bool is_unlocked_ext() const; 372 bool is_writeable_ext() const; 373 bool is_external_ext() const; 374 375 void unlock_diagnostic(); 376 377 Flag::MsgType get_locked_message(char*, int) const; 378 void get_locked_message_ext(char*, int) const; 379 380 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 381 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 382 void print_kind(outputStream* st); 383 void print_as_flag(outputStream* st); 384 385 static const char* flag_error_str(Flag::Error error); 386}; 387 388// debug flags control various aspects of the VM and are global accessible 389 390// use FlagSetting to temporarily change some debug flag 391// e.g. FlagSetting fs(DebugThisAndThat, true); 392// restored to previous value upon leaving scope 393class FlagSetting { 394 bool val; 395 bool* flag; 396 public: 397 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 398 ~FlagSetting() { *flag = val; } 399}; 400 401 402class CounterSetting { 403 intx* counter; 404 public: 405 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 406 ~CounterSetting() { (*counter)--; } 407}; 408 409class IntFlagSetting { 410 int val; 411 int* flag; 412 public: 413 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 414 ~IntFlagSetting() { *flag = val; } 415}; 416 417class UIntFlagSetting { 418 uint val; 419 uint* flag; 420 public: 421 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 422 ~UIntFlagSetting() { *flag = val; } 423}; 424 425class UIntXFlagSetting { 426 uintx val; 427 uintx* flag; 428 public: 429 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 430 ~UIntXFlagSetting() { *flag = val; } 431}; 432 433class DoubleFlagSetting { 434 double val; 435 double* flag; 436 public: 437 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 438 ~DoubleFlagSetting() { *flag = val; } 439}; 440 441class SizeTFlagSetting { 442 size_t val; 443 size_t* flag; 444 public: 445 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 446 ~SizeTFlagSetting() { *flag = val; } 447}; 448 449 450class CommandLineFlags { 451public: 452 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 453 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); } 454 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 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(Flag* flag, int* value, Flag::Flags origin); 461 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 462 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 463 464 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 465 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); } 466 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 467 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 468 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 469 470 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 471 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 472 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 473 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 474 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 475 476 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 477 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); } 478 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 479 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 480 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 481 482 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 483 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); } 484 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 485 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 486 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 487 488 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 489 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); } 490 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 491 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 492 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 493 494 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 495 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); } 496 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 497 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 498 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 499 500 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 501 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); } 502 // Contract: Flag will make private copy of the incoming value. 503 // Outgoing value is always malloc-ed, and caller MUST call free. 504 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 505 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 506 507 // Returns false if name is not a command line flag. 508 static bool wasSetOnCmdline(const char* name, bool* value); 509 static void printSetFlags(outputStream* out); 510 511 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 512 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 513 514 static void verify() PRODUCT_RETURN; 515}; 516 517// use this for flags that are true by default in the debug version but 518// false in the optimized version, and vice versa 519#ifdef ASSERT 520#define trueInDebug true 521#define falseInDebug false 522#else 523#define trueInDebug false 524#define falseInDebug true 525#endif 526 527// use this for flags that are true per default in the product build 528// but false in development builds, and vice versa 529#ifdef PRODUCT 530#define trueInProduct true 531#define falseInProduct false 532#else 533#define trueInProduct false 534#define falseInProduct true 535#endif 536 537#ifdef JAVASE_EMBEDDED 538#define falseInEmbedded false 539#else 540#define falseInEmbedded true 541#endif 542 543// develop flags are settable / visible only during development and are constant in the PRODUCT version 544// product flags are always settable / visible 545// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 546 547// A flag must be declared with one of the following types: 548// bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 549// The type "ccstr" is an alias for "const char*" and is used 550// only in this file, because the macrology requires single-token type names. 551 552// Note: Diagnostic options not meant for VM tuning or for product modes. 553// They are to be used for VM quality assurance or field diagnosis 554// of VM bugs. They are hidden so that users will not be encouraged to 555// try them as if they were VM ordinary execution options. However, they 556// are available in the product version of the VM. Under instruction 557// from support engineers, VM customers can turn them on to collect 558// diagnostic information about VM problems. To use a VM diagnostic 559// option, you must first specify +UnlockDiagnosticVMOptions. 560// (This master switch also affects the behavior of -Xprintflags.) 561// 562// experimental flags are in support of features that are not 563// part of the officially supported product, but are available 564// for experimenting with. They could, for example, be performance 565// features that may not have undergone full or rigorous QA, but which may 566// help performance in some cases and released for experimentation 567// by the community of users and developers. This flag also allows one to 568// be able to build a fully supported product that nonetheless also 569// ships with some unsupported, lightly tested, experimental features. 570// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 571// UnlockExperimentalVMOptions flag, which allows the control and 572// modification of the experimental flags. 573// 574// Nota bene: neither diagnostic nor experimental options should be used casually, 575// and they are not supported on production loads, except under explicit 576// direction from support engineers. 577// 578// manageable flags are writeable external product flags. 579// They are dynamically writeable through the JDK management interface 580// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 581// These flags are external exported interface (see CCC). The list of 582// manageable flags can be queried programmatically through the management 583// interface. 584// 585// A flag can be made as "manageable" only if 586// - the flag is defined in a CCC as an external exported interface. 587// - the VM implementation supports dynamic setting of the flag. 588// This implies that the VM must *always* query the flag variable 589// and not reuse state related to the flag state at any given time. 590// - you want the flag to be queried programmatically by the customers. 591// 592// product_rw flags are writeable internal product flags. 593// They are like "manageable" flags but for internal/private use. 594// The list of product_rw flags are internal/private flags which 595// may be changed/removed in a future release. It can be set 596// through the management interface to get/set value 597// when the name of flag is supplied. 598// 599// A flag can be made as "product_rw" only if 600// - the VM implementation supports dynamic setting of the flag. 601// This implies that the VM must *always* query the flag variable 602// and not reuse state related to the flag state at any given time. 603// 604// Note that when there is a need to support develop flags to be writeable, 605// it can be done in the same way as product_rw. 606// 607// range is a macro that will expand to min and max arguments for range 608// checking code if provided - see commandLineFlagRangeList.hpp 609// 610// constraint is a macro that will expand to custom function call 611// for constraint checking if provided - see commandLineFlagConstraintList.hpp 612// 613 614#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 615 \ 616 lp64_product(bool, UseCompressedOops, false, \ 617 "Use 32-bit object references in 64-bit VM. " \ 618 "lp64_product means flag is always constant in 32 bit VM") \ 619 \ 620 lp64_product(bool, UseCompressedClassPointers, false, \ 621 "Use 32-bit class pointers in 64-bit VM. " \ 622 "lp64_product means flag is always constant in 32 bit VM") \ 623 \ 624 notproduct(bool, CheckCompressedOops, true, \ 625 "Generate checks in encoding/decoding code in debug VM") \ 626 \ 627 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 628 "Heap allocation steps through preferred address regions to find" \ 629 " where it can allocate the heap. Number of steps to take per " \ 630 "region.") \ 631 range(1, max_uintx) \ 632 \ 633 diagnostic(bool, PrintCompressedOopsMode, false, \ 634 "Print compressed oops base address and encoding mode") \ 635 \ 636 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 637 "Default object alignment in bytes, 8 is minimum") \ 638 range(8, 256) \ 639 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 640 \ 641 product(bool, AssumeMP, false, \ 642 "Instruct the VM to assume multiple processors are available") \ 643 \ 644 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 645 /* removal testing. It was supposed to be removed before FCS but has */ \ 646 /* been re-added (see 6401008) */ \ 647 product_pd(bool, UseMembar, \ 648 "(Unstable) Issues membars on thread state transitions") \ 649 \ 650 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 651 "Clean the chunk pool asynchronously") \ 652 \ 653 experimental(bool, AlwaysSafeConstructors, false, \ 654 "Force safe construction, as if all fields are final.") \ 655 \ 656 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 657 "Enable normal processing of flags relating to field diagnostics")\ 658 \ 659 experimental(bool, UnlockExperimentalVMOptions, false, \ 660 "Enable normal processing of flags relating to experimental " \ 661 "features") \ 662 \ 663 product(bool, JavaMonitorsInStackTrace, true, \ 664 "Print information about Java monitor locks when the stacks are" \ 665 "dumped") \ 666 \ 667 product_pd(bool, UseLargePages, \ 668 "Use large page memory") \ 669 \ 670 product_pd(bool, UseLargePagesIndividualAllocation, \ 671 "Allocate large pages individually for better affinity") \ 672 \ 673 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 674 "Fail large pages individual allocation") \ 675 \ 676 product(bool, UseLargePagesInMetaspace, false, \ 677 "Use large page memory in metaspace. " \ 678 "Only used if UseLargePages is enabled.") \ 679 \ 680 develop(bool, TracePageSizes, false, \ 681 "Trace page size selection and usage") \ 682 \ 683 product(bool, UseNUMA, false, \ 684 "Use NUMA if available") \ 685 \ 686 product(bool, UseNUMAInterleaving, false, \ 687 "Interleave memory across NUMA nodes if available") \ 688 \ 689 product(size_t, NUMAInterleaveGranularity, 2*M, \ 690 "Granularity to use for NUMA interleaving on Windows OS") \ 691 range(os::vm_allocation_granularity(), max_uintx) \ 692 constraint(NUMAInterleaveGranularityConstraintFunc,AfterErgo) \ 693 \ 694 product(bool, ForceNUMA, false, \ 695 "Force NUMA optimizations on single-node/UMA systems") \ 696 \ 697 product(uintx, NUMAChunkResizeWeight, 20, \ 698 "Percentage (0-100) used to weight the current sample when " \ 699 "computing exponentially decaying average for " \ 700 "AdaptiveNUMAChunkSizing") \ 701 range(0, 100) \ 702 \ 703 product(size_t, NUMASpaceResizeRate, 1*G, \ 704 "Do not reallocate more than this amount per collection") \ 705 range(0, max_uintx) \ 706 \ 707 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 708 "Enable adaptive chunk sizing for NUMA") \ 709 \ 710 product(bool, NUMAStats, false, \ 711 "Print NUMA stats in detailed heap information") \ 712 \ 713 product(uintx, NUMAPageScanRate, 256, \ 714 "Maximum number of pages to include in the page scan procedure") \ 715 range(0, max_uintx) \ 716 \ 717 product_pd(bool, NeedsDeoptSuspend, \ 718 "True for register window machines (sparc/ia64)") \ 719 \ 720 product(intx, UseSSE, 99, \ 721 "Highest supported SSE instructions set on x86/x64") \ 722 range(0, 99) \ 723 \ 724 product(bool, UseAES, false, \ 725 "Control whether AES instructions can be used on x86/x64") \ 726 \ 727 product(bool, UseSHA, false, \ 728 "Control whether SHA instructions can be used " \ 729 "on SPARC and on ARM") \ 730 \ 731 product(bool, UseGHASHIntrinsics, false, \ 732 "Use intrinsics for GHASH versions of crypto") \ 733 \ 734 product(size_t, LargePageSizeInBytes, 0, \ 735 "Large page size (0 to let VM choose the page size)") \ 736 range(0, max_uintx) \ 737 \ 738 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 739 "Use large pages if maximum heap is at least this big") \ 740 range(0, max_uintx) \ 741 \ 742 product(bool, ForceTimeHighResolution, false, \ 743 "Using high time resolution (for Win32 only)") \ 744 \ 745 develop(bool, TraceItables, false, \ 746 "Trace initialization and use of itables") \ 747 \ 748 develop(bool, TracePcPatching, false, \ 749 "Trace usage of frame::patch_pc") \ 750 \ 751 develop(bool, TraceJumps, false, \ 752 "Trace assembly jumps in thread ring buffer") \ 753 \ 754 develop(bool, TraceRelocator, false, \ 755 "Trace the bytecode relocator") \ 756 \ 757 develop(bool, TraceLongCompiles, false, \ 758 "Print out every time compilation is longer than " \ 759 "a given threshold") \ 760 \ 761 develop(bool, SafepointALot, false, \ 762 "Generate a lot of safepoints. This works with " \ 763 "GuaranteedSafepointInterval") \ 764 \ 765 product_pd(bool, BackgroundCompilation, \ 766 "A thread requesting compilation is not blocked during " \ 767 "compilation") \ 768 \ 769 product(bool, PrintVMQWaitTime, false, \ 770 "Print out the waiting time in VM operation queue") \ 771 \ 772 develop(bool, TraceOopMapGeneration, false, \ 773 "Show OopMapGeneration") \ 774 \ 775 product(bool, MethodFlushing, true, \ 776 "Reclamation of zombie and not-entrant methods") \ 777 \ 778 develop(bool, VerifyStack, false, \ 779 "Verify stack of each thread when it is entering a runtime call") \ 780 \ 781 diagnostic(bool, ForceUnreachable, false, \ 782 "Make all non code cache addresses to be unreachable by " \ 783 "forcing use of 64bit literal fixups") \ 784 \ 785 notproduct(bool, StressDerivedPointers, false, \ 786 "Force scavenge when a derived pointer is detected on stack " \ 787 "after rtm call") \ 788 \ 789 develop(bool, TraceDerivedPointers, false, \ 790 "Trace traversal of derived pointers on stack") \ 791 \ 792 notproduct(bool, TraceCodeBlobStacks, false, \ 793 "Trace stack-walk of codeblobs") \ 794 \ 795 product(bool, PrintJNIResolving, false, \ 796 "Used to implement -v:jni") \ 797 \ 798 notproduct(bool, PrintRewrites, false, \ 799 "Print methods that are being rewritten") \ 800 \ 801 product(bool, UseInlineCaches, true, \ 802 "Use Inline Caches for virtual calls ") \ 803 \ 804 develop(bool, InlineArrayCopy, true, \ 805 "Inline arraycopy native that is known to be part of " \ 806 "base library DLL") \ 807 \ 808 develop(bool, InlineObjectHash, true, \ 809 "Inline Object::hashCode() native that is known to be part " \ 810 "of base library DLL") \ 811 \ 812 develop(bool, InlineNatives, true, \ 813 "Inline natives that are known to be part of base library DLL") \ 814 \ 815 develop(bool, InlineMathNatives, true, \ 816 "Inline SinD, CosD, etc.") \ 817 \ 818 develop(bool, InlineClassNatives, true, \ 819 "Inline Class.isInstance, etc") \ 820 \ 821 develop(bool, InlineThreadNatives, true, \ 822 "Inline Thread.currentThread, etc") \ 823 \ 824 develop(bool, InlineUnsafeOps, true, \ 825 "Inline memory ops (native methods) from Unsafe") \ 826 \ 827 product(bool, CriticalJNINatives, true, \ 828 "Check for critical JNI entry points") \ 829 \ 830 notproduct(bool, StressCriticalJNINatives, false, \ 831 "Exercise register saving code in critical natives") \ 832 \ 833 product(bool, UseSSE42Intrinsics, false, \ 834 "SSE4.2 versions of intrinsics") \ 835 \ 836 product(bool, UseAESIntrinsics, false, \ 837 "Use intrinsics for AES versions of crypto") \ 838 \ 839 product(bool, UseSHA1Intrinsics, false, \ 840 "Use intrinsics for SHA-1 crypto hash function. " \ 841 "Requires that UseSHA is enabled.") \ 842 \ 843 product(bool, UseSHA256Intrinsics, false, \ 844 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 845 "Requires that UseSHA is enabled.") \ 846 \ 847 product(bool, UseSHA512Intrinsics, false, \ 848 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 849 "Requires that UseSHA is enabled.") \ 850 \ 851 product(bool, UseCRC32Intrinsics, false, \ 852 "use intrinsics for java.util.zip.CRC32") \ 853 \ 854 product(bool, UseCRC32CIntrinsics, false, \ 855 "use intrinsics for java.util.zip.CRC32C") \ 856 \ 857 product(bool, UseAdler32Intrinsics, false, \ 858 "use intrinsics for java.util.zip.Adler32") \ 859 \ 860 diagnostic(ccstrlist, DisableIntrinsic, "", \ 861 "do not expand intrinsics whose (internal) names appear here") \ 862 \ 863 develop(bool, TraceCallFixup, false, \ 864 "Trace all call fixups") \ 865 \ 866 develop(bool, DeoptimizeALot, false, \ 867 "Deoptimize at every exit from the runtime system") \ 868 \ 869 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 870 "A comma separated list of bcis to deoptimize at") \ 871 \ 872 product(bool, DeoptimizeRandom, false, \ 873 "Deoptimize random frames on random exit from the runtime system")\ 874 \ 875 notproduct(bool, ZombieALot, false, \ 876 "Create zombies (non-entrant) at exit from the runtime system") \ 877 \ 878 product(bool, UnlinkSymbolsALot, false, \ 879 "Unlink unreferenced symbols from the symbol table at safepoints")\ 880 \ 881 notproduct(bool, WalkStackALot, false, \ 882 "Trace stack (no print) at every exit from the runtime system") \ 883 \ 884 product(bool, Debugging, false, \ 885 "Set when executing debug methods in debug.cpp " \ 886 "(to prevent triggering assertions)") \ 887 \ 888 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 889 "Enable strict checks that safepoints cannot happen for threads " \ 890 "that use No_Safepoint_Verifier") \ 891 \ 892 notproduct(bool, VerifyLastFrame, false, \ 893 "Verify oops on last frame on entry to VM") \ 894 \ 895 develop(bool, TraceHandleAllocation, false, \ 896 "Print out warnings when suspiciously many handles are allocated")\ 897 \ 898 product(bool, FailOverToOldVerifier, true, \ 899 "Fail over to old verifier when split verifier fails") \ 900 \ 901 develop(bool, ShowSafepointMsgs, false, \ 902 "Show message about safepoint synchronization") \ 903 \ 904 product(bool, SafepointTimeout, false, \ 905 "Time out and warn or fail after SafepointTimeoutDelay " \ 906 "milliseconds if failed to reach safepoint") \ 907 \ 908 develop(bool, DieOnSafepointTimeout, false, \ 909 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 910 \ 911 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 912 /* typically, at most a few retries are needed */ \ 913 product(intx, SuspendRetryCount, 50, \ 914 "Maximum retry count for an external suspend request") \ 915 range(0, max_intx) \ 916 \ 917 product(intx, SuspendRetryDelay, 5, \ 918 "Milliseconds to delay per retry (* current_retry_count)") \ 919 range(0, max_intx) \ 920 \ 921 product(bool, AssertOnSuspendWaitFailure, false, \ 922 "Assert/Guarantee on external suspend wait failure") \ 923 \ 924 product(bool, TraceSuspendWaitFailures, false, \ 925 "Trace external suspend wait failures") \ 926 \ 927 product(bool, MaxFDLimit, true, \ 928 "Bump the number of file descriptors to maximum in Solaris") \ 929 \ 930 diagnostic(bool, LogEvents, true, \ 931 "Enable the various ring buffer event logs") \ 932 \ 933 diagnostic(uintx, LogEventsBufferEntries, 10, \ 934 "Number of ring buffer event logs") \ 935 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 936 \ 937 product(bool, BytecodeVerificationRemote, true, \ 938 "Enable the Java bytecode verifier for remote classes") \ 939 \ 940 product(bool, BytecodeVerificationLocal, false, \ 941 "Enable the Java bytecode verifier for local classes") \ 942 \ 943 develop(bool, ForceFloatExceptions, trueInDebug, \ 944 "Force exceptions on FP stack under/overflow") \ 945 \ 946 develop(bool, VerifyStackAtCalls, false, \ 947 "Verify that the stack pointer is unchanged after calls") \ 948 \ 949 develop(bool, TraceJavaAssertions, false, \ 950 "Trace java language assertions") \ 951 \ 952 notproduct(bool, CheckAssertionStatusDirectives, false, \ 953 "Temporary - see javaClasses.cpp") \ 954 \ 955 notproduct(bool, PrintMallocFree, false, \ 956 "Trace calls to C heap malloc/free allocation") \ 957 \ 958 product(bool, PrintOopAddress, false, \ 959 "Always print the location of the oop") \ 960 \ 961 notproduct(bool, VerifyCodeCache, false, \ 962 "Verify code cache on memory allocation/deallocation") \ 963 \ 964 develop(bool, UseMallocOnly, false, \ 965 "Use only malloc/free for allocation (no resource area/arena)") \ 966 \ 967 develop(bool, PrintMalloc, false, \ 968 "Print all malloc/free calls") \ 969 \ 970 develop(bool, PrintMallocStatistics, false, \ 971 "Print malloc/free statistics") \ 972 \ 973 develop(bool, ZapResourceArea, trueInDebug, \ 974 "Zap freed resource/arena space with 0xABABABAB") \ 975 \ 976 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 977 "Zap freed VM handle space with 0xBCBCBCBC") \ 978 \ 979 develop(bool, ZapJNIHandleArea, trueInDebug, \ 980 "Zap freed JNI handle space with 0xFEFEFEFE") \ 981 \ 982 notproduct(bool, ZapStackSegments, trueInDebug, \ 983 "Zap allocated/freed stack segments with 0xFADFADED") \ 984 \ 985 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 986 "Zap unused heap space with 0xBAADBABE") \ 987 \ 988 develop(bool, TraceZapUnusedHeapArea, false, \ 989 "Trace zapping of unused heap space") \ 990 \ 991 develop(bool, CheckZapUnusedHeapArea, false, \ 992 "Check zapping of unused heap space") \ 993 \ 994 develop(bool, ZapFillerObjects, trueInDebug, \ 995 "Zap filler objects with 0xDEAFBABE") \ 996 \ 997 develop(bool, PrintVMMessages, true, \ 998 "Print VM messages on console") \ 999 \ 1000 product(bool, PrintGCApplicationConcurrentTime, false, \ 1001 "Print the time the application has been running") \ 1002 \ 1003 product(bool, PrintGCApplicationStoppedTime, false, \ 1004 "Print the time the application has been stopped") \ 1005 \ 1006 diagnostic(bool, VerboseVerification, false, \ 1007 "Display detailed verification details") \ 1008 \ 1009 notproduct(uintx, ErrorHandlerTest, 0, \ 1010 "If > 0, provokes an error after VM initialization; the value " \ 1011 "determines which error to provoke. See test_error_handler() " \ 1012 "in debug.cpp.") \ 1013 \ 1014 notproduct(uintx, TestCrashInErrorHandler, 0, \ 1015 "If > 0, provokes an error inside VM error handler (a secondary " \ 1016 "crash). see test_error_handler() in debug.cpp.") \ 1017 \ 1018 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1019 "If true, tests SafeFetch inside error handler.") \ 1020 \ 1021 develop(bool, Verbose, false, \ 1022 "Print additional debugging information from other modes") \ 1023 \ 1024 develop(bool, PrintMiscellaneous, false, \ 1025 "Print uncategorized debugging information (requires +Verbose)") \ 1026 \ 1027 develop(bool, WizardMode, false, \ 1028 "Print much more debugging information") \ 1029 \ 1030 product(bool, ShowMessageBoxOnError, false, \ 1031 "Keep process alive on VM fatal error") \ 1032 \ 1033 product(bool, CreateCoredumpOnCrash, true, \ 1034 "Create core/mini dump on VM fatal error") \ 1035 \ 1036 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 1037 "Timeout, in seconds, to limit the time spent on writing an " \ 1038 "error log in case of a crash.") \ 1039 range(0, (uint64_t)max_jlong/1000) \ 1040 \ 1041 product_pd(bool, UseOSErrorReporting, \ 1042 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1043 \ 1044 product(bool, SuppressFatalErrorMessage, false, \ 1045 "Report NO fatal error message (avoid deadlock)") \ 1046 \ 1047 product(ccstrlist, OnError, "", \ 1048 "Run user-defined commands on fatal error; see VMError.cpp " \ 1049 "for examples") \ 1050 \ 1051 product(ccstrlist, OnOutOfMemoryError, "", \ 1052 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1053 \ 1054 manageable(bool, HeapDumpBeforeFullGC, false, \ 1055 "Dump heap to file before any major stop-the-world GC") \ 1056 \ 1057 manageable(bool, HeapDumpAfterFullGC, false, \ 1058 "Dump heap to file after any major stop-the-world GC") \ 1059 \ 1060 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1061 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1062 \ 1063 manageable(ccstr, HeapDumpPath, NULL, \ 1064 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1065 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1066 "in the working directory)") \ 1067 \ 1068 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1069 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1070 "when the heap usage is larger than this") \ 1071 \ 1072 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1073 "Approximate segment size when generating a segmented heap dump") \ 1074 \ 1075 develop(bool, BreakAtWarning, false, \ 1076 "Execute breakpoint upon encountering VM warning") \ 1077 \ 1078 develop(bool, UseFakeTimers, false, \ 1079 "Tell whether the VM should use system time or a fake timer") \ 1080 \ 1081 product(ccstr, NativeMemoryTracking, "off", \ 1082 "Native memory tracking options") \ 1083 \ 1084 diagnostic(bool, PrintNMTStatistics, false, \ 1085 "Print native memory tracking summary data if it is on") \ 1086 \ 1087 diagnostic(bool, LogCompilation, false, \ 1088 "Log compilation activity in detail to LogFile") \ 1089 \ 1090 product(bool, PrintCompilation, false, \ 1091 "Print compilations") \ 1092 \ 1093 diagnostic(bool, TraceNMethodInstalls, false, \ 1094 "Trace nmethod installation") \ 1095 \ 1096 diagnostic(intx, ScavengeRootsInCode, 2, \ 1097 "0: do not allow scavengable oops in the code cache; " \ 1098 "1: allow scavenging from the code cache; " \ 1099 "2: emit as many constants as the compiler can see") \ 1100 range(0, 2) \ 1101 \ 1102 product(bool, AlwaysRestoreFPU, false, \ 1103 "Restore the FPU control word after every JNI call (expensive)") \ 1104 \ 1105 diagnostic(bool, PrintCompilation2, false, \ 1106 "Print additional statistics per compilation") \ 1107 \ 1108 diagnostic(bool, PrintAdapterHandlers, false, \ 1109 "Print code generated for i2c/c2i adapters") \ 1110 \ 1111 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1112 "Verify that i2c/c2i adapters are called properly") \ 1113 \ 1114 develop(bool, VerifyAdapterSharing, false, \ 1115 "Verify that the code for shared adapters is the equivalent") \ 1116 \ 1117 diagnostic(bool, PrintAssembly, false, \ 1118 "Print assembly code (using external disassembler.so)") \ 1119 \ 1120 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1121 "Print options string passed to disassembler.so") \ 1122 \ 1123 notproduct(bool, PrintNMethodStatistics, false, \ 1124 "Print a summary statistic for the generated nmethods") \ 1125 \ 1126 diagnostic(bool, PrintNMethods, false, \ 1127 "Print assembly code for nmethods when generated") \ 1128 \ 1129 diagnostic(bool, PrintNativeNMethods, false, \ 1130 "Print assembly code for native nmethods when generated") \ 1131 \ 1132 develop(bool, PrintDebugInfo, false, \ 1133 "Print debug information for all nmethods when generated") \ 1134 \ 1135 develop(bool, PrintRelocations, false, \ 1136 "Print relocation information for all nmethods when generated") \ 1137 \ 1138 develop(bool, PrintDependencies, false, \ 1139 "Print dependency information for all nmethods when generated") \ 1140 \ 1141 develop(bool, PrintExceptionHandlers, false, \ 1142 "Print exception handler tables for all nmethods when generated") \ 1143 \ 1144 develop(bool, StressCompiledExceptionHandlers, false, \ 1145 "Exercise compiled exception handlers") \ 1146 \ 1147 develop(bool, InterceptOSException, false, \ 1148 "Start debugger when an implicit OS (e.g. NULL) " \ 1149 "exception happens") \ 1150 \ 1151 product(bool, PrintCodeCache, false, \ 1152 "Print the code cache memory usage when exiting") \ 1153 \ 1154 develop(bool, PrintCodeCache2, false, \ 1155 "Print detailed usage information on the code cache when exiting")\ 1156 \ 1157 product(bool, PrintCodeCacheOnCompilation, false, \ 1158 "Print the code cache memory usage each time a method is " \ 1159 "compiled") \ 1160 \ 1161 diagnostic(bool, PrintStubCode, false, \ 1162 "Print generated stub code") \ 1163 \ 1164 product(bool, StackTraceInThrowable, true, \ 1165 "Collect backtrace in throwable when exception happens") \ 1166 \ 1167 product(bool, OmitStackTraceInFastThrow, true, \ 1168 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1169 \ 1170 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1171 "Print bytecode statistics when dumping profiler output") \ 1172 \ 1173 product(bool, ProfilerRecordPC, false, \ 1174 "Collect ticks for each 16 byte interval of compiled code") \ 1175 \ 1176 product(bool, ProfileVM, false, \ 1177 "Profile ticks that fall within VM (either in the VM Thread " \ 1178 "or VM code called through stubs)") \ 1179 \ 1180 product(bool, ProfileIntervals, false, \ 1181 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1182 \ 1183 notproduct(bool, ProfilerCheckIntervals, false, \ 1184 "Collect and print information on spacing of profiler ticks") \ 1185 \ 1186 product(bool, PrintWarnings, true, \ 1187 "Print JVM warnings to output stream") \ 1188 \ 1189 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1190 "Print warnings for stalled SpinLocks") \ 1191 \ 1192 product(bool, RegisterFinalizersAtInit, true, \ 1193 "Register finalizable objects at end of Object.<init> or " \ 1194 "after allocation") \ 1195 \ 1196 develop(bool, RegisterReferences, true, \ 1197 "Tell whether the VM should register soft/weak/final/phantom " \ 1198 "references") \ 1199 \ 1200 develop(bool, IgnoreRewrites, false, \ 1201 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1202 "This is unsafe!") \ 1203 \ 1204 develop(bool, PrintCodeCacheExtension, false, \ 1205 "Print extension of code cache") \ 1206 \ 1207 develop(bool, UsePrivilegedStack, true, \ 1208 "Enable the security JVM functions") \ 1209 \ 1210 develop(bool, ProtectionDomainVerification, true, \ 1211 "Verify protection domain before resolution in system dictionary")\ 1212 \ 1213 product(bool, ClassUnloading, true, \ 1214 "Do unloading of classes") \ 1215 \ 1216 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1217 "Do unloading of classes with a concurrent marking cycle") \ 1218 \ 1219 develop(bool, DisableStartThread, false, \ 1220 "Disable starting of additional Java threads " \ 1221 "(for debugging only)") \ 1222 \ 1223 develop(bool, MemProfiling, false, \ 1224 "Write memory usage profiling to log file") \ 1225 \ 1226 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1227 "Print the system dictionary at exit") \ 1228 \ 1229 experimental(intx, PredictedLoadedClassCount, 0, \ 1230 "Experimental: Tune loaded class cache starting size") \ 1231 \ 1232 diagnostic(bool, UnsyncloadClass, false, \ 1233 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1234 "class loader must call VM synchronized for findClass " \ 1235 "and defineClass.") \ 1236 \ 1237 product(bool, AlwaysLockClassLoader, false, \ 1238 "Require the VM to acquire the class loader lock before calling " \ 1239 "loadClass() even for class loaders registering " \ 1240 "as parallel capable") \ 1241 \ 1242 product(bool, AllowParallelDefineClass, false, \ 1243 "Allow parallel defineClass requests for class loaders " \ 1244 "registering as parallel capable") \ 1245 \ 1246 product(bool, MustCallLoadClassInternal, false, \ 1247 "Call loadClassInternal() rather than loadClass()") \ 1248 \ 1249 product_pd(bool, DontYieldALot, \ 1250 "Throw away obvious excess yield calls") \ 1251 \ 1252 product_pd(bool, ConvertSleepToYield, \ 1253 "Convert sleep(0) to thread yield " \ 1254 "(may be off for Solaris to improve GUI)") \ 1255 \ 1256 product(bool, ConvertYieldToSleep, false, \ 1257 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1258 "behavior") \ 1259 \ 1260 develop(bool, UseDetachedThreads, true, \ 1261 "Use detached threads that are recycled upon termination " \ 1262 "(for Solaris only)") \ 1263 \ 1264 product(bool, UseLWPSynchronization, true, \ 1265 "Use LWP-based instead of libthread-based synchronization " \ 1266 "(SPARC only)") \ 1267 \ 1268 experimental(ccstr, SyncKnobs, NULL, \ 1269 "(Unstable) Various monitor synchronization tunables") \ 1270 \ 1271 experimental(intx, EmitSync, 0, \ 1272 "(Unsafe, Unstable) " \ 1273 "Control emission of inline sync fast-path code") \ 1274 \ 1275 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1276 range(0, max_jint) \ 1277 \ 1278 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1279 \ 1280 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1281 "Experimental Sync flags") \ 1282 \ 1283 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1284 \ 1285 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1286 \ 1287 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1288 \ 1289 experimental(intx, hashCode, 5, \ 1290 "(Unstable) select hashCode generation algorithm") \ 1291 \ 1292 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1293 "(Unstable, Linux-specific) " \ 1294 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1295 \ 1296 product(bool, FilterSpuriousWakeups, true, \ 1297 "When true prevents OS-level spurious, or premature, wakeups " \ 1298 "from Object.wait (Ignored for Windows)") \ 1299 \ 1300 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1301 \ 1302 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1303 \ 1304 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1305 \ 1306 develop(bool, UsePthreads, false, \ 1307 "Use pthread-based instead of libthread-based synchronization " \ 1308 "(SPARC only)") \ 1309 \ 1310 product(bool, ReduceSignalUsage, false, \ 1311 "Reduce the use of OS signals in Java and/or the VM") \ 1312 \ 1313 develop_pd(bool, ShareVtableStubs, \ 1314 "Share vtable stubs (smaller code but worse branch prediction") \ 1315 \ 1316 develop(bool, LoadLineNumberTables, true, \ 1317 "Tell whether the class file parser loads line number tables") \ 1318 \ 1319 develop(bool, LoadLocalVariableTables, true, \ 1320 "Tell whether the class file parser loads local variable tables") \ 1321 \ 1322 develop(bool, LoadLocalVariableTypeTables, true, \ 1323 "Tell whether the class file parser loads local variable type" \ 1324 "tables") \ 1325 \ 1326 product(bool, AllowUserSignalHandlers, false, \ 1327 "Do not complain if the application installs signal handlers " \ 1328 "(Solaris & Linux only)") \ 1329 \ 1330 product(bool, UseSignalChaining, true, \ 1331 "Use signal-chaining to invoke signal handlers installed " \ 1332 "by the application (Solaris & Linux only)") \ 1333 \ 1334 product(bool, AllowJNIEnvProxy, false, \ 1335 "Allow JNIEnv proxies for jdbx") \ 1336 \ 1337 product(bool, RestoreMXCSROnJNICalls, false, \ 1338 "Restore MXCSR when returning from JNI calls") \ 1339 \ 1340 product(bool, CheckJNICalls, false, \ 1341 "Verify all arguments to JNI calls") \ 1342 \ 1343 product(bool, CheckEndorsedAndExtDirs, false, \ 1344 "Verify the endorsed and extension directories are not used") \ 1345 \ 1346 product(bool, UseFastJNIAccessors, true, \ 1347 "Use optimized versions of Get<Primitive>Field") \ 1348 \ 1349 product(intx, MaxJNILocalCapacity, 65536, \ 1350 "Maximum allowable local JNI handle capacity to " \ 1351 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1352 "where <= 0 is unlimited, default: 65536") \ 1353 range(min_intx, max_intx) \ 1354 \ 1355 product(bool, EagerXrunInit, false, \ 1356 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1357 "but not all -Xrun libraries may support the state of the VM " \ 1358 "at this time") \ 1359 \ 1360 product(bool, PreserveAllAnnotations, false, \ 1361 "Preserve RuntimeInvisibleAnnotations as well " \ 1362 "as RuntimeVisibleAnnotations") \ 1363 \ 1364 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1365 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1366 \ 1367 product(bool, UseXMMForArrayCopy, false, \ 1368 "Use SSE2 MOVQ instruction for Arraycopy") \ 1369 \ 1370 product(intx, FieldsAllocationStyle, 1, \ 1371 "0 - type based with oops first, " \ 1372 "1 - with oops last, " \ 1373 "2 - oops in super and sub classes are together") \ 1374 range(0, 2) \ 1375 \ 1376 product(bool, CompactFields, true, \ 1377 "Allocate nonstatic fields in gaps between previous fields") \ 1378 \ 1379 notproduct(bool, PrintFieldLayout, false, \ 1380 "Print field layout for each class") \ 1381 \ 1382 /* Need to limit the extent of the padding to reasonable size. */\ 1383 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1384 /* aggressive prefetching, while still leaving the room for segregating */\ 1385 /* among the distinct pages. */\ 1386 product(intx, ContendedPaddingWidth, 128, \ 1387 "How many bytes to pad the fields/classes marked @Contended with")\ 1388 range(0, 8192) \ 1389 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1390 \ 1391 product(bool, EnableContended, true, \ 1392 "Enable @Contended annotation support") \ 1393 \ 1394 product(bool, RestrictContended, true, \ 1395 "Restrict @Contended to trusted classes") \ 1396 \ 1397 product(bool, UseBiasedLocking, true, \ 1398 "Enable biased locking in JVM") \ 1399 \ 1400 product(intx, BiasedLockingStartupDelay, 4000, \ 1401 "Number of milliseconds to wait before enabling biased locking") \ 1402 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1403 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1404 \ 1405 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1406 "Print statistics of biased locking in JVM") \ 1407 \ 1408 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1409 "Threshold of number of revocations per type to try to " \ 1410 "rebias all objects in the heap of that type") \ 1411 range(0, max_intx) \ 1412 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1413 \ 1414 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1415 "Threshold of number of revocations per type to permanently " \ 1416 "revoke biases of all objects in the heap of that type") \ 1417 range(0, max_intx) \ 1418 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1419 \ 1420 product(intx, BiasedLockingDecayTime, 25000, \ 1421 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1422 "type after previous bulk rebias") \ 1423 range(500, max_intx) \ 1424 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1425 \ 1426 product(bool, ExitOnOutOfMemoryError, false, \ 1427 "JVM exits on the first occurrence of an out-of-memory error") \ 1428 \ 1429 product(bool, CrashOnOutOfMemoryError, false, \ 1430 "JVM aborts, producing an error log and core/mini dump, on the " \ 1431 "first occurrence of an out-of-memory error") \ 1432 \ 1433 /* tracing */ \ 1434 \ 1435 develop(bool, StressRewriter, false, \ 1436 "Stress linktime bytecode rewriting") \ 1437 \ 1438 product(ccstr, TraceJVMTI, NULL, \ 1439 "Trace flags for JVMTI functions and events") \ 1440 \ 1441 /* This option can change an EMCP method into an obsolete method. */ \ 1442 /* This can affect tests that except specific methods to be EMCP. */ \ 1443 /* This option should be used with caution. */ \ 1444 product(bool, StressLdcRewrite, false, \ 1445 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1446 \ 1447 product(uintx, TraceRedefineClasses, 0, \ 1448 "Trace level for JVMTI RedefineClasses") \ 1449 range(0, 0xFFFFFFFF) \ 1450 \ 1451 /* change to false by default sometime after Mustang */ \ 1452 product(bool, VerifyMergedCPBytecodes, true, \ 1453 "Verify bytecodes after RedefineClasses constant pool merging") \ 1454 \ 1455 develop(bool, TraceJNIHandleAllocation, false, \ 1456 "Trace allocation/deallocation of JNI handle blocks") \ 1457 \ 1458 develop(bool, TraceBytecodes, false, \ 1459 "Trace bytecode execution") \ 1460 \ 1461 product(bool, TraceExceptions, false, \ 1462 "Trace exceptions") \ 1463 \ 1464 develop(bool, TraceICs, false, \ 1465 "Trace inline cache changes") \ 1466 \ 1467 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1468 "Trace method invocation counter overflow") \ 1469 \ 1470 develop(bool, TraceInlineCacheClearing, false, \ 1471 "Trace clearing of inline caches in nmethods") \ 1472 \ 1473 develop(bool, TraceDependencies, false, \ 1474 "Trace dependencies") \ 1475 \ 1476 develop(bool, VerifyDependencies, trueInDebug, \ 1477 "Exercise and verify the compilation dependency mechanism") \ 1478 \ 1479 develop(bool, TraceNewOopMapGeneration, false, \ 1480 "Trace OopMapGeneration") \ 1481 \ 1482 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1483 "Trace OopMapGeneration: print detailed cell states") \ 1484 \ 1485 develop(bool, TimeOopMap, false, \ 1486 "Time calls to GenerateOopMap::compute_map() in sum") \ 1487 \ 1488 develop(bool, TimeOopMap2, false, \ 1489 "Time calls to GenerateOopMap::compute_map() individually") \ 1490 \ 1491 develop(bool, TraceMonitorMismatch, false, \ 1492 "Trace monitor matching failures during OopMapGeneration") \ 1493 \ 1494 develop(bool, TraceOopMapRewrites, false, \ 1495 "Trace rewriting of method oops during oop map generation") \ 1496 \ 1497 develop(bool, TraceICBuffer, false, \ 1498 "Trace usage of IC buffer") \ 1499 \ 1500 develop(bool, TraceCompiledIC, false, \ 1501 "Trace changes of compiled IC") \ 1502 \ 1503 develop(bool, TraceStartupTime, false, \ 1504 "Trace setup time") \ 1505 \ 1506 develop(bool, TraceProtectionDomainVerification, false, \ 1507 "Trace protection domain verification") \ 1508 \ 1509 develop(bool, TraceClearedExceptions, false, \ 1510 "Print when an exception is forcibly cleared") \ 1511 \ 1512 product(bool, TraceClassResolution, false, \ 1513 "Trace all constant pool resolutions (for debugging)") \ 1514 \ 1515 product(bool, TraceBiasedLocking, false, \ 1516 "Trace biased locking in JVM") \ 1517 \ 1518 product(bool, TraceMonitorInflation, false, \ 1519 "Trace monitor inflation in JVM") \ 1520 \ 1521 /* gc */ \ 1522 \ 1523 product(bool, UseSerialGC, false, \ 1524 "Use the Serial garbage collector") \ 1525 \ 1526 product(bool, UseG1GC, false, \ 1527 "Use the Garbage-First garbage collector") \ 1528 \ 1529 product(bool, UseParallelGC, false, \ 1530 "Use the Parallel Scavenge garbage collector") \ 1531 \ 1532 product(bool, UseParallelOldGC, false, \ 1533 "Use the Parallel Old garbage collector") \ 1534 \ 1535 product(uintx, HeapMaximumCompactionInterval, 20, \ 1536 "How often should we maximally compact the heap (not allowing " \ 1537 "any dead space)") \ 1538 range(0, max_uintx) \ 1539 \ 1540 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1541 "The collection count for the first maximum compaction") \ 1542 range(0, max_uintx) \ 1543 \ 1544 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1545 "Use maximum compaction in the Parallel Old garbage collector " \ 1546 "for a system GC") \ 1547 \ 1548 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1549 "The mean used by the parallel compact dead wood " \ 1550 "limiter (a number between 0-100)") \ 1551 range(0, 100) \ 1552 \ 1553 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1554 "The standard deviation used by the parallel compact dead wood " \ 1555 "limiter (a number between 0-100)") \ 1556 range(0, 100) \ 1557 \ 1558 product(uint, ParallelGCThreads, 0, \ 1559 "Number of parallel threads parallel gc will use") \ 1560 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1561 \ 1562 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1563 "Use semaphore synchronization for the GC Threads, " \ 1564 "instead of synchronization based on mutexes") \ 1565 \ 1566 product(bool, UseDynamicNumberOfGCThreads, false, \ 1567 "Dynamically choose the number of parallel threads " \ 1568 "parallel gc will use") \ 1569 \ 1570 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1571 "Force dynamic selection of the number of " \ 1572 "parallel threads parallel gc will use to aid debugging") \ 1573 \ 1574 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1575 "Size of heap (bytes) per GC thread used in calculating the " \ 1576 "number of GC threads") \ 1577 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1578 \ 1579 product(bool, TraceDynamicGCThreads, false, \ 1580 "Trace the dynamic GC thread usage") \ 1581 \ 1582 product(uint, ConcGCThreads, 0, \ 1583 "Number of threads concurrent gc will use") \ 1584 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1585 \ 1586 product(uintx, GCTaskTimeStampEntries, 200, \ 1587 "Number of time stamp entries per gc worker thread") \ 1588 range(1, max_uintx) \ 1589 \ 1590 product(bool, AlwaysTenure, false, \ 1591 "Always tenure objects in eden (ParallelGC only)") \ 1592 \ 1593 product(bool, NeverTenure, false, \ 1594 "Never tenure objects in eden, may tenure on overflow " \ 1595 "(ParallelGC only)") \ 1596 \ 1597 product(bool, ScavengeBeforeFullGC, true, \ 1598 "Scavenge youngest generation before each full GC.") \ 1599 \ 1600 product(bool, UseConcMarkSweepGC, false, \ 1601 "Use Concurrent Mark-Sweep GC in the old generation") \ 1602 \ 1603 product(bool, ExplicitGCInvokesConcurrent, false, \ 1604 "A System.gc() request invokes a concurrent collection; " \ 1605 "(effective only when using concurrent collectors)") \ 1606 \ 1607 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1608 "A System.gc() request invokes a concurrent collection and " \ 1609 "also unloads classes during such a concurrent gc cycle " \ 1610 "(effective only when UseConcMarkSweepGC)") \ 1611 \ 1612 product(bool, GCLockerInvokesConcurrent, false, \ 1613 "The exit of a JNI critical section necessitating a scavenge, " \ 1614 "also kicks off a background concurrent collection") \ 1615 \ 1616 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1617 "How much the GC can expand the eden by while the GC locker " \ 1618 "is active (as a percentage)") \ 1619 range(0, 100) \ 1620 \ 1621 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1622 "Number of times to retry allocations when " \ 1623 "blocked by the GC locker") \ 1624 range(0, max_uintx) \ 1625 \ 1626 product(bool, UseCMSBestFit, true, \ 1627 "Use CMS best fit allocation strategy") \ 1628 \ 1629 product(bool, UseParNewGC, false, \ 1630 "Use parallel threads in the new generation") \ 1631 \ 1632 product(bool, PrintTaskqueue, false, \ 1633 "Print taskqueue statistics for parallel collectors") \ 1634 \ 1635 product(bool, PrintTerminationStats, false, \ 1636 "Print termination statistics for parallel collectors") \ 1637 \ 1638 product(uintx, ParallelGCBufferWastePct, 10, \ 1639 "Wasted fraction of parallel allocation buffer") \ 1640 range(0, 100) \ 1641 \ 1642 product(uintx, TargetPLABWastePct, 10, \ 1643 "Target wasted space in last buffer as percent of overall " \ 1644 "allocation") \ 1645 range(1, 100) \ 1646 \ 1647 product(uintx, PLABWeight, 75, \ 1648 "Percentage (0-100) used to weight the current sample when " \ 1649 "computing exponentially decaying average for ResizePLAB") \ 1650 range(0, 100) \ 1651 \ 1652 product(bool, ResizePLAB, true, \ 1653 "Dynamically resize (survivor space) promotion LAB's") \ 1654 \ 1655 product(bool, PrintPLAB, false, \ 1656 "Print (survivor space) promotion LAB's sizing decisions") \ 1657 \ 1658 product(intx, ParGCArrayScanChunk, 50, \ 1659 "Scan a subset of object array and push remainder, if array is " \ 1660 "bigger than this") \ 1661 range(1, max_intx) \ 1662 \ 1663 product(bool, ParGCUseLocalOverflow, false, \ 1664 "Instead of a global overflow list, use local overflow stacks") \ 1665 \ 1666 product(bool, ParGCTrimOverflow, true, \ 1667 "Eagerly trim the local overflow lists " \ 1668 "(when ParGCUseLocalOverflow)") \ 1669 \ 1670 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1671 "Simulate work queue overflow in ParNew") \ 1672 \ 1673 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1674 "An `interval' counter that determines how frequently " \ 1675 "we simulate overflow; a smaller number increases frequency") \ 1676 \ 1677 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1678 "The desired number of objects to claim from the overflow list") \ 1679 range(0, max_uintx) \ 1680 \ 1681 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1682 "The number of strides per worker thread that we divide up the " \ 1683 "card table scanning work into") \ 1684 range(1, max_uintx) \ 1685 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1686 \ 1687 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1688 "The number of cards in each chunk of the parallel chunks used " \ 1689 "during card table scanning") \ 1690 range(1, max_intx) \ 1691 \ 1692 product(uintx, OldPLABWeight, 50, \ 1693 "Percentage (0-100) used to weight the current sample when " \ 1694 "computing exponentially decaying average for resizing " \ 1695 "OldPLABSize") \ 1696 range(0, 100) \ 1697 \ 1698 product(bool, ResizeOldPLAB, true, \ 1699 "Dynamically resize (old gen) promotion LAB's") \ 1700 \ 1701 product(bool, PrintOldPLAB, false, \ 1702 "Print (old gen) promotion LAB's sizing decisions") \ 1703 \ 1704 product(size_t, CMSOldPLABMax, 1024, \ 1705 "Maximum size of CMS gen promotion LAB caches per worker " \ 1706 "per block size") \ 1707 range(1, max_uintx) \ 1708 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1709 \ 1710 product(size_t, CMSOldPLABMin, 16, \ 1711 "Minimum size of CMS gen promotion LAB caches per worker " \ 1712 "per block size") \ 1713 range(1, max_uintx) \ 1714 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1715 \ 1716 product(uintx, CMSOldPLABNumRefills, 4, \ 1717 "Nominal number of refills of CMS gen promotion LAB cache " \ 1718 "per worker per block size") \ 1719 range(1, max_uintx) \ 1720 \ 1721 product(bool, CMSOldPLABResizeQuicker, false, \ 1722 "React on-the-fly during a scavenge to a sudden " \ 1723 "change in block demand rate") \ 1724 \ 1725 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1726 "The tolerance of the phase-change detector for on-the-fly " \ 1727 "PLAB resizing during a scavenge") \ 1728 range(1, max_uintx) \ 1729 \ 1730 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1731 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1732 "during a scavenge") \ 1733 range(1, max_uintx) \ 1734 \ 1735 product(bool, AlwaysPreTouch, false, \ 1736 "Force all freshly committed pages to be pre-touched") \ 1737 \ 1738 product_pd(size_t, CMSYoungGenPerWorker, \ 1739 "The maximum size of young gen chosen by default per GC worker " \ 1740 "thread available") \ 1741 range(1, max_uintx) \ 1742 \ 1743 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1744 "Percentage (0-100) used to add conservatism when computing the " \ 1745 "duty cycle") \ 1746 range(0, 100) \ 1747 \ 1748 product(uintx, CMSExpAvgFactor, 50, \ 1749 "Percentage (0-100) used to weight the current sample when " \ 1750 "computing exponential averages for CMS statistics") \ 1751 range(0, 100) \ 1752 \ 1753 product(uintx, CMS_FLSWeight, 75, \ 1754 "Percentage (0-100) used to weight the current sample when " \ 1755 "computing exponentially decaying averages for CMS FLS " \ 1756 "statistics") \ 1757 range(0, 100) \ 1758 \ 1759 product(uintx, CMS_FLSPadding, 1, \ 1760 "The multiple of deviation from mean to use for buffering " \ 1761 "against volatility in free list demand") \ 1762 range(0, max_juint) \ 1763 \ 1764 product(uintx, FLSCoalescePolicy, 2, \ 1765 "CMS: aggressiveness level for coalescing, increasing " \ 1766 "from 0 to 4") \ 1767 range(0, 4) \ 1768 \ 1769 product(bool, FLSAlwaysCoalesceLarge, false, \ 1770 "CMS: larger free blocks are always available for coalescing") \ 1771 \ 1772 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1773 "CMS: the smaller the percentage the greater the coalescing " \ 1774 "force") \ 1775 range(0.0, 1.0) \ 1776 \ 1777 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1778 "CMS: the factor by which to inflate estimated demand of small " \ 1779 "block sizes to prevent coalescing with an adjoining block") \ 1780 range(0.0, DBL_MAX) \ 1781 \ 1782 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1783 "CMS: the factor by which to inflate estimated demand of large " \ 1784 "block sizes to prevent coalescing with an adjoining block") \ 1785 range(0.0, DBL_MAX) \ 1786 \ 1787 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1788 "CMS: the factor by which to inflate estimated demand of small " \ 1789 "block sizes to prevent splitting to supply demand for smaller " \ 1790 "blocks") \ 1791 range(0.0, DBL_MAX) \ 1792 \ 1793 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1794 "CMS: the factor by which to inflate estimated demand of large " \ 1795 "block sizes to prevent splitting to supply demand for smaller " \ 1796 "blocks") \ 1797 range(0.0, DBL_MAX) \ 1798 \ 1799 product(bool, CMSExtrapolateSweep, false, \ 1800 "CMS: cushion for block demand during sweep") \ 1801 \ 1802 product(uintx, CMS_SweepWeight, 75, \ 1803 "Percentage (0-100) used to weight the current sample when " \ 1804 "computing exponentially decaying average for inter-sweep " \ 1805 "duration") \ 1806 range(0, 100) \ 1807 \ 1808 product(uintx, CMS_SweepPadding, 1, \ 1809 "The multiple of deviation from mean to use for buffering " \ 1810 "against volatility in inter-sweep duration") \ 1811 range(0, max_juint) \ 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 range(0, max_uintx) \ 1817 \ 1818 product(bool, CMSClassUnloadingEnabled, true, \ 1819 "Whether class unloading enabled when using CMS GC") \ 1820 \ 1821 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1822 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1823 "count for which classes may not be unloaded") \ 1824 range(0, max_uintx) \ 1825 \ 1826 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1827 "Replenish an indexed free list with this number of chunks") \ 1828 range(1, max_uintx) \ 1829 \ 1830 product(bool, CMSReplenishIntermediate, true, \ 1831 "Replenish all intermediate free-list caches") \ 1832 \ 1833 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1834 "When satisfying batched demand, split blocks from the " \ 1835 "IndexedFreeList whose size is a multiple of requested size") \ 1836 \ 1837 product(bool, CMSLoopWarn, false, \ 1838 "Warn in case of excessive CMS looping") \ 1839 \ 1840 /* where does the range max value of (max_jint - 1) come from? */ \ 1841 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1842 "Maximum size of marking stack") \ 1843 range(1, (max_jint - 1)) \ 1844 \ 1845 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1846 "Size of marking stack") \ 1847 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1848 \ 1849 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1850 "Simulate frequent marking stack / work queue overflow") \ 1851 \ 1852 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1853 "An \"interval\" counter that determines how frequently " \ 1854 "to simulate overflow; a smaller number increases frequency") \ 1855 \ 1856 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1857 "Maximum number of abortable preclean iterations, if > 0") \ 1858 range(0, max_uintx) \ 1859 \ 1860 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1861 "Maximum time in abortable preclean (in milliseconds)") \ 1862 range(0, max_intx) \ 1863 \ 1864 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1865 "Nominal minimum work per abortable preclean iteration") \ 1866 range(0, max_uintx) \ 1867 \ 1868 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1869 "Time that we sleep between iterations when not given " \ 1870 "enough work per iteration") \ 1871 range(0, max_intx) \ 1872 \ 1873 product(size_t, CMSRescanMultiple, 32, \ 1874 "Size (in cards) of CMS parallel rescan task") \ 1875 range(1, max_uintx) \ 1876 \ 1877 product(size_t, CMSConcMarkMultiple, 32, \ 1878 "Size (in cards) of CMS concurrent MT marking task") \ 1879 range(1, max_uintx) \ 1880 \ 1881 product(bool, CMSAbortSemantics, false, \ 1882 "Whether abort-on-overflow semantics is implemented") \ 1883 \ 1884 product(bool, CMSParallelInitialMarkEnabled, true, \ 1885 "Use the parallel initial mark.") \ 1886 \ 1887 product(bool, CMSParallelRemarkEnabled, true, \ 1888 "Whether parallel remark enabled (only if ParNewGC)") \ 1889 \ 1890 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1891 "Whether parallel remark of survivor space " \ 1892 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1893 \ 1894 product(bool, CMSPLABRecordAlways, true, \ 1895 "Always record survivor space PLAB boundaries (effective only " \ 1896 "if CMSParallelSurvivorRemarkEnabled)") \ 1897 \ 1898 product(bool, CMSEdenChunksRecordAlways, true, \ 1899 "Always record eden chunks used for the parallel initial mark " \ 1900 "or remark of eden") \ 1901 \ 1902 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1903 "Print the eden and the survivor chunks used for the parallel " \ 1904 "initial mark or remark of the eden/survivor spaces") \ 1905 \ 1906 product(bool, CMSConcurrentMTEnabled, true, \ 1907 "Whether multi-threaded concurrent work enabled " \ 1908 "(effective only if ParNewGC)") \ 1909 \ 1910 product(bool, CMSPrecleaningEnabled, true, \ 1911 "Whether concurrent precleaning enabled") \ 1912 \ 1913 product(uintx, CMSPrecleanIter, 3, \ 1914 "Maximum number of precleaning iteration passes") \ 1915 range(0, 9) \ 1916 \ 1917 product(uintx, CMSPrecleanDenominator, 3, \ 1918 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1919 "ratio") \ 1920 range(1, max_uintx) \ 1921 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1922 \ 1923 product(uintx, CMSPrecleanNumerator, 2, \ 1924 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1925 "ratio") \ 1926 range(0, max_uintx-1) \ 1927 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1928 \ 1929 product(bool, CMSPrecleanRefLists1, true, \ 1930 "Preclean ref lists during (initial) preclean phase") \ 1931 \ 1932 product(bool, CMSPrecleanRefLists2, false, \ 1933 "Preclean ref lists during abortable preclean phase") \ 1934 \ 1935 product(bool, CMSPrecleanSurvivors1, false, \ 1936 "Preclean survivors during (initial) preclean phase") \ 1937 \ 1938 product(bool, CMSPrecleanSurvivors2, true, \ 1939 "Preclean survivors during abortable preclean phase") \ 1940 \ 1941 product(uintx, CMSPrecleanThreshold, 1000, \ 1942 "Do not iterate again if number of dirty cards is less than this")\ 1943 range(100, max_uintx) \ 1944 \ 1945 product(bool, CMSCleanOnEnter, true, \ 1946 "Clean-on-enter optimization for reducing number of dirty cards") \ 1947 \ 1948 product(uintx, CMSRemarkVerifyVariant, 1, \ 1949 "Choose variant (1,2) of verification following remark") \ 1950 range(1, 2) \ 1951 \ 1952 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1953 "If Eden size is below this, do not try to schedule remark") \ 1954 range(0, max_uintx) \ 1955 \ 1956 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1957 "The Eden occupancy percentage (0-100) at which " \ 1958 "to try and schedule remark pause") \ 1959 range(0, 100) \ 1960 \ 1961 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1962 "Start sampling eden top at least before young gen " \ 1963 "occupancy reaches 1/<ratio> of the size at which " \ 1964 "we plan to schedule remark") \ 1965 range(1, max_uintx) \ 1966 \ 1967 product(uintx, CMSSamplingGrain, 16*K, \ 1968 "The minimum distance between eden samples for CMS (see above)") \ 1969 range(1, max_uintx) \ 1970 \ 1971 product(bool, CMSScavengeBeforeRemark, false, \ 1972 "Attempt scavenge before the CMS remark step") \ 1973 \ 1974 develop(bool, CMSTraceSweeper, false, \ 1975 "Trace some actions of the CMS sweeper") \ 1976 \ 1977 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1978 "Don't drain below this size per parallel worker/thief") \ 1979 range(1, max_juint) \ 1980 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1981 \ 1982 manageable(intx, CMSWaitDuration, 2000, \ 1983 "Time in milliseconds that CMS thread waits for young GC") \ 1984 range(min_jint, max_jint) \ 1985 \ 1986 develop(uintx, CMSCheckInterval, 1000, \ 1987 "Interval in milliseconds that CMS thread checks if it " \ 1988 "should start a collection cycle") \ 1989 \ 1990 product(bool, CMSYield, true, \ 1991 "Yield between steps of CMS") \ 1992 \ 1993 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1994 "Bitmap operations should process at most this many bits " \ 1995 "between yields") \ 1996 range(1, max_uintx) \ 1997 \ 1998 product(bool, CMSDumpAtPromotionFailure, false, \ 1999 "Dump useful information about the state of the CMS old " \ 2000 "generation upon a promotion failure") \ 2001 \ 2002 product(bool, CMSPrintChunksInDump, false, \ 2003 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2004 "more detailed information about the free chunks") \ 2005 \ 2006 product(bool, CMSPrintObjectsInDump, false, \ 2007 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2008 "more detailed information about the allocated objects") \ 2009 \ 2010 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 2011 "Verify that all references across the FLS boundary " \ 2012 "are to valid objects") \ 2013 \ 2014 diagnostic(bool, FLSVerifyLists, false, \ 2015 "Do lots of (expensive) FreeListSpace verification") \ 2016 \ 2017 diagnostic(bool, FLSVerifyIndexTable, false, \ 2018 "Do lots of (expensive) FLS index table verification") \ 2019 \ 2020 develop(bool, FLSVerifyDictionary, false, \ 2021 "Do lots of (expensive) FLS dictionary verification") \ 2022 \ 2023 develop(bool, VerifyBlockOffsetArray, false, \ 2024 "Do (expensive) block offset array verification") \ 2025 \ 2026 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2027 "Maintain _unallocated_block in BlockOffsetArray " \ 2028 "(currently applicable only to CMS collector)") \ 2029 \ 2030 develop(bool, TraceCMSState, false, \ 2031 "Trace the state of the CMS collection") \ 2032 \ 2033 product(intx, RefDiscoveryPolicy, 0, \ 2034 "Select type of reference discovery policy: " \ 2035 "reference-based(0) or referent-based(1)") \ 2036 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2037 ReferenceProcessor::DiscoveryPolicyMax) \ 2038 \ 2039 product(bool, ParallelRefProcEnabled, false, \ 2040 "Enable parallel reference processing whenever possible") \ 2041 \ 2042 product(bool, ParallelRefProcBalancingEnabled, true, \ 2043 "Enable balancing of reference processing queues") \ 2044 \ 2045 product(uintx, CMSTriggerRatio, 80, \ 2046 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2047 "allocated before a CMS collection cycle commences") \ 2048 range(0, 100) \ 2049 \ 2050 product(uintx, CMSBootstrapOccupancy, 50, \ 2051 "Percentage CMS generation occupancy at which to " \ 2052 "initiate CMS collection for bootstrapping collection stats") \ 2053 range(0, 100) \ 2054 \ 2055 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2056 "Percentage CMS generation occupancy to start a CMS collection " \ 2057 "cycle. A negative value means that CMSTriggerRatio is used") \ 2058 range(min_intx, 100) \ 2059 \ 2060 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2061 "Percentage of the (entire) heap occupancy to start a " \ 2062 "concurrent GC cycle. It is used by GCs that trigger a " \ 2063 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2064 "not just one of the generations (e.g., G1). A value of 0 " \ 2065 "denotes 'do constant GC cycles'.") \ 2066 range(0, 100) \ 2067 \ 2068 manageable(intx, CMSTriggerInterval, -1, \ 2069 "Commence a CMS collection cycle (at least) every so many " \ 2070 "milliseconds (0 permanently, -1 disabled)") \ 2071 range(-1, max_intx) \ 2072 \ 2073 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2074 "Only use occupancy as a criterion for starting a CMS collection")\ 2075 \ 2076 product(uintx, CMSIsTooFullPercentage, 98, \ 2077 "An absolute ceiling above which CMS will always consider the " \ 2078 "unloading of classes when class unloading is enabled") \ 2079 range(0, 100) \ 2080 \ 2081 develop(bool, CMSTestInFreeList, false, \ 2082 "Check if the coalesced range is already in the " \ 2083 "free lists as claimed") \ 2084 \ 2085 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2086 "Check that all the garbage collected was returned to the " \ 2087 "free lists") \ 2088 \ 2089 notproduct(bool, ScavengeALot, false, \ 2090 "Force scavenge at every Nth exit from the runtime system " \ 2091 "(N=ScavengeALotInterval)") \ 2092 \ 2093 develop(bool, FullGCALot, false, \ 2094 "Force full gc at every Nth exit from the runtime system " \ 2095 "(N=FullGCALotInterval)") \ 2096 \ 2097 notproduct(bool, GCALotAtAllSafepoints, false, \ 2098 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2099 \ 2100 product(bool, PrintPromotionFailure, false, \ 2101 "Print additional diagnostic information following " \ 2102 "promotion failure") \ 2103 \ 2104 notproduct(bool, PromotionFailureALot, false, \ 2105 "Use promotion failure handling on every youngest generation " \ 2106 "collection") \ 2107 \ 2108 develop(uintx, PromotionFailureALotCount, 1000, \ 2109 "Number of promotion failures occurring at PLAB " \ 2110 "refill attempts (ParNew) or promotion attempts " \ 2111 "(other young collectors)") \ 2112 \ 2113 develop(uintx, PromotionFailureALotInterval, 5, \ 2114 "Total collections between promotion failures a lot") \ 2115 \ 2116 experimental(uintx, WorkStealingSleepMillis, 1, \ 2117 "Sleep time when sleep is used for yields") \ 2118 \ 2119 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2120 "Number of yields before a sleep is done during work stealing") \ 2121 \ 2122 experimental(uintx, WorkStealingHardSpins, 4096, \ 2123 "Number of iterations in a spin loop between checks on " \ 2124 "time out of hard spin") \ 2125 \ 2126 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2127 "Ratio of hard spins to calls to yield") \ 2128 \ 2129 develop(uintx, ObjArrayMarkingStride, 512, \ 2130 "Number of object array elements to push onto the marking stack " \ 2131 "before pushing a continuation entry") \ 2132 \ 2133 develop(bool, MetadataAllocationFailALot, false, \ 2134 "Fail metadata allocations at intervals controlled by " \ 2135 "MetadataAllocationFailALotInterval") \ 2136 \ 2137 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2138 "Metadata allocation failure a lot interval") \ 2139 \ 2140 develop(bool, TraceMetadataChunkAllocation, false, \ 2141 "Trace chunk metadata allocations") \ 2142 \ 2143 product(bool, TraceMetadataHumongousAllocation, false, \ 2144 "Trace humongous metadata allocations") \ 2145 \ 2146 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2147 "Trace virtual space metadata allocations") \ 2148 \ 2149 notproduct(bool, ExecuteInternalVMTests, false, \ 2150 "Enable execution of internal VM tests") \ 2151 \ 2152 notproduct(bool, VerboseInternalVMTests, false, \ 2153 "Turn on logging for internal VM tests.") \ 2154 \ 2155 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2156 \ 2157 product_pd(bool, ResizeTLAB, \ 2158 "Dynamically resize TLAB size for threads") \ 2159 \ 2160 product(bool, ZeroTLAB, false, \ 2161 "Zero out the newly created TLAB") \ 2162 \ 2163 product(bool, FastTLABRefill, true, \ 2164 "Use fast TLAB refill code") \ 2165 \ 2166 product(bool, PrintTLAB, false, \ 2167 "Print various TLAB related information") \ 2168 \ 2169 product(bool, TLABStats, true, \ 2170 "Provide more detailed and expensive TLAB statistics " \ 2171 "(with PrintTLAB)") \ 2172 \ 2173 product_pd(bool, NeverActAsServerClassMachine, \ 2174 "Never act like a server-class machine") \ 2175 \ 2176 product(bool, AlwaysActAsServerClassMachine, false, \ 2177 "Always act like a server-class machine") \ 2178 \ 2179 product_pd(uint64_t, MaxRAM, \ 2180 "Real memory size (in bytes) used to set maximum heap size") \ 2181 range(0, 0XFFFFFFFFFFFFFFFF) \ 2182 \ 2183 product(size_t, ErgoHeapSizeLimit, 0, \ 2184 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2185 "MaxRAM / MaxRAMFraction") \ 2186 range(0, max_uintx) \ 2187 \ 2188 product(uintx, MaxRAMFraction, 4, \ 2189 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2190 "size") \ 2191 range(1, max_uintx) \ 2192 \ 2193 product(uintx, MinRAMFraction, 2, \ 2194 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2195 "size on systems with small physical memory size") \ 2196 range(1, max_uintx) \ 2197 \ 2198 product(uintx, InitialRAMFraction, 64, \ 2199 "Fraction (1/n) of real memory used for initial heap size") \ 2200 range(1, max_uintx) \ 2201 \ 2202 develop(uintx, MaxVirtMemFraction, 2, \ 2203 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2204 "determining maximum heap size") \ 2205 \ 2206 product(bool, UseAutoGCSelectPolicy, false, \ 2207 "Use automatic collection selection policy") \ 2208 \ 2209 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2210 "Automatic GC selection pause threshold in milliseconds") \ 2211 range(0, max_uintx) \ 2212 \ 2213 product(bool, UseAdaptiveSizePolicy, true, \ 2214 "Use adaptive generation sizing policies") \ 2215 \ 2216 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2217 "Use adaptive survivor sizing policies") \ 2218 \ 2219 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2220 "Use adaptive young-old sizing policies at minor collections") \ 2221 \ 2222 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2223 "Use adaptive young-old sizing policies at major collections") \ 2224 \ 2225 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2226 "Include statistics from System.gc() for adaptive size policy") \ 2227 \ 2228 product(bool, UseAdaptiveGCBoundary, false, \ 2229 "Allow young-old boundary to move") \ 2230 \ 2231 develop(bool, TraceAdaptiveGCBoundary, false, \ 2232 "Trace young-old boundary moves") \ 2233 \ 2234 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2235 "Resize the virtual spaces of the young or old generations") \ 2236 range(-1, 1) \ 2237 \ 2238 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2239 "Policy for changing generation size for throughput goals") \ 2240 range(0, 1) \ 2241 \ 2242 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2243 "Number of steps where heuristics is used before data is used") \ 2244 range(0, max_uintx) \ 2245 \ 2246 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2247 "Number of collections before the adaptive sizing is started") \ 2248 \ 2249 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2250 "Collection interval for printing information; zero means never") \ 2251 range(0, max_uintx) \ 2252 \ 2253 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2254 "Use adaptive minimum footprint as a goal") \ 2255 \ 2256 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2257 "Weight given to exponential resizing, between 0 and 100") \ 2258 range(0, 100) \ 2259 \ 2260 product(uintx, AdaptiveTimeWeight, 25, \ 2261 "Weight given to time in adaptive policy, between 0 and 100") \ 2262 range(0, 100) \ 2263 \ 2264 product(uintx, PausePadding, 1, \ 2265 "How much buffer to keep for pause time") \ 2266 range(0, max_juint) \ 2267 \ 2268 product(uintx, PromotedPadding, 3, \ 2269 "How much buffer to keep for promotion failure") \ 2270 range(0, max_juint) \ 2271 \ 2272 product(uintx, SurvivorPadding, 3, \ 2273 "How much buffer to keep for survivor overflow") \ 2274 range(0, max_juint) \ 2275 \ 2276 product(uintx, ThresholdTolerance, 10, \ 2277 "Allowed collection cost difference between generations") \ 2278 range(0, 100) \ 2279 \ 2280 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2281 "If collection costs are within margin, reduce both by full " \ 2282 "delta") \ 2283 range(0, 100) \ 2284 \ 2285 product(uintx, YoungGenerationSizeIncrement, 20, \ 2286 "Adaptive size percentage change in young generation") \ 2287 range(0, 100) \ 2288 \ 2289 product(uintx, YoungGenerationSizeSupplement, 80, \ 2290 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2291 range(0, 100) \ 2292 \ 2293 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2294 "Decay factor to YoungedGenerationSizeSupplement") \ 2295 range(1, max_uintx) \ 2296 \ 2297 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2298 "Adaptive size percentage change in tenured generation") \ 2299 range(0, 100) \ 2300 \ 2301 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2302 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2303 range(0, 100) \ 2304 \ 2305 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2306 "Decay factor to TenuredGenerationSizeIncrement") \ 2307 range(1, max_uintx) \ 2308 \ 2309 product(uintx, MaxGCPauseMillis, max_uintx, \ 2310 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2311 "or (G1 Only) the maximum GC time per MMU time slice") \ 2312 range(1, max_uintx) \ 2313 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \ 2314 \ 2315 product(uintx, GCPauseIntervalMillis, 0, \ 2316 "Time slice for MMU specification") \ 2317 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \ 2318 \ 2319 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2320 "Adaptive size policy maximum GC minor pause time goal " \ 2321 "in millisecond") \ 2322 range(0, max_uintx) \ 2323 \ 2324 product(uintx, GCTimeRatio, 99, \ 2325 "Adaptive size policy application time to GC time ratio") \ 2326 range(0, max_juint) \ 2327 \ 2328 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2329 "Adaptive size scale down factor for shrinking") \ 2330 range(1, max_uintx) \ 2331 \ 2332 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2333 "Adaptive size decays the major cost for long major intervals") \ 2334 \ 2335 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2336 "Time scale over which major costs decay") \ 2337 range(0, max_uintx) \ 2338 \ 2339 product(uintx, MinSurvivorRatio, 3, \ 2340 "Minimum ratio of young generation/survivor space size") \ 2341 range(3, max_uintx) \ 2342 \ 2343 product(uintx, InitialSurvivorRatio, 8, \ 2344 "Initial ratio of young generation/survivor space size") \ 2345 range(0, max_uintx) \ 2346 \ 2347 product(size_t, BaseFootPrintEstimate, 256*M, \ 2348 "Estimate of footprint other than Java Heap") \ 2349 range(0, max_uintx) \ 2350 \ 2351 product(bool, UseGCOverheadLimit, true, \ 2352 "Use policy to limit of proportion of time spent in GC " \ 2353 "before an OutOfMemory error is thrown") \ 2354 \ 2355 product(uintx, GCTimeLimit, 98, \ 2356 "Limit of the proportion of time spent in GC before " \ 2357 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2358 range(0, 100) \ 2359 \ 2360 product(uintx, GCHeapFreeLimit, 2, \ 2361 "Minimum percentage of free space after a full GC before an " \ 2362 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2363 range(0, 100) \ 2364 \ 2365 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2366 "Number of consecutive collections before gc time limit fires") \ 2367 range(1, max_uintx) \ 2368 \ 2369 product(bool, PrintAdaptiveSizePolicy, false, \ 2370 "Print information about AdaptiveSizePolicy") \ 2371 \ 2372 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2373 "How far ahead to prefetch destination area (<= 0 means off)") \ 2374 range(-1, max_jint) \ 2375 \ 2376 product(intx, PrefetchScanIntervalInBytes, -1, \ 2377 "How far ahead to prefetch scan area (<= 0 means off)") \ 2378 range(-1, max_jint) \ 2379 \ 2380 product(intx, PrefetchFieldsAhead, -1, \ 2381 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2382 range(-1, max_jint) \ 2383 \ 2384 diagnostic(bool, VerifySilently, false, \ 2385 "Do not print the verification progress") \ 2386 \ 2387 diagnostic(bool, VerifyDuringStartup, false, \ 2388 "Verify memory system before executing any Java code " \ 2389 "during VM initialization") \ 2390 \ 2391 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2392 "Verify system before exiting") \ 2393 \ 2394 diagnostic(bool, VerifyBeforeGC, false, \ 2395 "Verify memory system before GC") \ 2396 \ 2397 diagnostic(bool, VerifyAfterGC, false, \ 2398 "Verify memory system after GC") \ 2399 \ 2400 diagnostic(bool, VerifyDuringGC, false, \ 2401 "Verify memory system during GC (between phases)") \ 2402 \ 2403 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2404 "Enable parallel memory system verification") \ 2405 \ 2406 diagnostic(bool, DeferInitialCardMark, false, \ 2407 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2408 "may arise from new_pre_store_barrier") \ 2409 \ 2410 product(bool, UseCondCardMark, false, \ 2411 "Check for already marked card before updating card table") \ 2412 \ 2413 diagnostic(bool, VerifyRememberedSets, false, \ 2414 "Verify GC remembered sets") \ 2415 \ 2416 diagnostic(bool, VerifyObjectStartArray, true, \ 2417 "Verify GC object start array if verify before/after") \ 2418 \ 2419 product(bool, DisableExplicitGC, false, \ 2420 "Ignore calls to System.gc()") \ 2421 \ 2422 notproduct(bool, CheckMemoryInitialization, false, \ 2423 "Check memory initialization") \ 2424 \ 2425 diagnostic(bool, BindCMSThreadToCPU, false, \ 2426 "Bind CMS Thread to CPU if possible") \ 2427 \ 2428 diagnostic(uintx, CPUForCMSThread, 0, \ 2429 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2430 range(0, max_juint) \ 2431 \ 2432 product(bool, BindGCTaskThreadsToCPUs, false, \ 2433 "Bind GCTaskThreads to CPUs if possible") \ 2434 \ 2435 product(bool, UseGCTaskAffinity, false, \ 2436 "Use worker affinity when asking for GCTasks") \ 2437 \ 2438 product(uintx, ProcessDistributionStride, 4, \ 2439 "Stride through processors when distributing processes") \ 2440 range(0, max_juint) \ 2441 \ 2442 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2443 "Number of times the coordinator GC thread will sleep while " \ 2444 "yielding before giving up and resuming GC") \ 2445 range(0, max_juint) \ 2446 \ 2447 product(uintx, CMSYieldSleepCount, 0, \ 2448 "Number of times a GC thread (minus the coordinator) " \ 2449 "will sleep while yielding before giving up and resuming GC") \ 2450 range(0, max_juint) \ 2451 \ 2452 /* gc tracing */ \ 2453 manageable(bool, PrintGC, false, \ 2454 "Print message at garbage collection") \ 2455 \ 2456 manageable(bool, PrintGCDetails, false, \ 2457 "Print more details at garbage collection") \ 2458 \ 2459 manageable(bool, PrintGCDateStamps, false, \ 2460 "Print date stamps at garbage collection") \ 2461 \ 2462 manageable(bool, PrintGCTimeStamps, false, \ 2463 "Print timestamps at garbage collection") \ 2464 \ 2465 manageable(bool, PrintGCID, true, \ 2466 "Print an identifier for each garbage collection") \ 2467 \ 2468 product(bool, PrintGCTaskTimeStamps, false, \ 2469 "Print timestamps for individual gc worker thread tasks") \ 2470 \ 2471 develop(intx, ConcGCYieldTimeout, 0, \ 2472 "If non-zero, assert that GC threads yield within this " \ 2473 "number of milliseconds") \ 2474 range(0, max_intx) \ 2475 \ 2476 product(bool, PrintReferenceGC, false, \ 2477 "Print times spent handling reference objects during GC " \ 2478 "(enabled only when PrintGCDetails)") \ 2479 \ 2480 develop(bool, TraceReferenceGC, false, \ 2481 "Trace handling of soft/weak/final/phantom references") \ 2482 \ 2483 develop(bool, TraceFinalizerRegistration, false, \ 2484 "Trace registration of final references") \ 2485 \ 2486 notproduct(bool, TraceScavenge, false, \ 2487 "Trace scavenge") \ 2488 \ 2489 product(bool, IgnoreEmptyClassPaths, false, \ 2490 "Ignore empty path elements in -classpath") \ 2491 \ 2492 product(bool, TraceClassPaths, false, \ 2493 "Trace processing of class paths") \ 2494 \ 2495 product_rw(bool, TraceClassLoading, false, \ 2496 "Trace all classes loaded") \ 2497 \ 2498 product(bool, TraceClassLoadingPreorder, false, \ 2499 "Trace all classes loaded in order referenced (not loaded)") \ 2500 \ 2501 product_rw(bool, TraceClassUnloading, false, \ 2502 "Trace unloading of classes") \ 2503 \ 2504 product_rw(bool, TraceLoaderConstraints, false, \ 2505 "Trace loader constraints") \ 2506 \ 2507 develop(bool, TraceClassLoaderData, false, \ 2508 "Trace class loader loader_data lifetime") \ 2509 \ 2510 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2511 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2512 "Initial size of the boot class loader data metaspace") \ 2513 range(30*K, max_uintx/BytesPerWord) \ 2514 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2515 \ 2516 product(bool, TraceYoungGenTime, false, \ 2517 "Trace accumulated time for young collection") \ 2518 \ 2519 product(bool, TraceOldGenTime, false, \ 2520 "Trace accumulated time for old collection") \ 2521 \ 2522 product(bool, PrintTenuringDistribution, false, \ 2523 "Print tenuring age information") \ 2524 \ 2525 product_rw(bool, PrintHeapAtGC, false, \ 2526 "Print heap layout before and after each GC") \ 2527 \ 2528 product_rw(bool, PrintHeapAtGCExtended, false, \ 2529 "Print extended information about the layout of the heap " \ 2530 "when -XX:+PrintHeapAtGC is set") \ 2531 \ 2532 product(bool, PrintHeapAtSIGBREAK, true, \ 2533 "Print heap layout in response to SIGBREAK") \ 2534 \ 2535 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2536 "Print a class histogram before any major stop-world GC") \ 2537 \ 2538 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2539 "Print a class histogram after any major stop-world GC") \ 2540 \ 2541 manageable(bool, PrintClassHistogram, false, \ 2542 "Print a histogram of class instances") \ 2543 \ 2544 develop(bool, TraceWorkGang, false, \ 2545 "Trace activities of work gangs") \ 2546 \ 2547 develop(bool, TraceBlockOffsetTable, false, \ 2548 "Print BlockOffsetTable maps") \ 2549 \ 2550 develop(bool, TraceCardTableModRefBS, false, \ 2551 "Print CardTableModRefBS maps") \ 2552 \ 2553 develop(bool, TraceGCTaskManager, false, \ 2554 "Trace actions of the GC task manager") \ 2555 \ 2556 develop(bool, TraceGCTaskQueue, false, \ 2557 "Trace actions of the GC task queues") \ 2558 \ 2559 diagnostic(bool, TraceGCTaskThread, false, \ 2560 "Trace actions of the GC task threads") \ 2561 \ 2562 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2563 "Print the time taken by each phase in ParallelOldGC " \ 2564 "(PrintGCDetails must also be enabled)") \ 2565 \ 2566 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2567 "Trace marking phase in ParallelOldGC") \ 2568 \ 2569 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2570 "Trace summary phase in ParallelOldGC") \ 2571 \ 2572 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2573 "Trace compaction phase in ParallelOldGC") \ 2574 \ 2575 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2576 "Trace dense prefix computation for ParallelOldGC") \ 2577 \ 2578 develop(bool, IgnoreLibthreadGPFault, false, \ 2579 "Suppress workaround for libthread GP fault") \ 2580 \ 2581 product(bool, PrintJNIGCStalls, false, \ 2582 "Print diagnostic message when GC is stalled " \ 2583 "by JNI critical section") \ 2584 \ 2585 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2586 "The percentage of the used heap that the instances of a class " \ 2587 "must occupy for the class to generate a trace event") \ 2588 range(0.0, 100.0) \ 2589 \ 2590 /* GC log rotation setting */ \ 2591 \ 2592 product(bool, UseGCLogFileRotation, false, \ 2593 "Rotate gclog files (for long running applications). It requires "\ 2594 "-Xloggc:<filename>") \ 2595 \ 2596 product(uintx, NumberOfGCLogFiles, 0, \ 2597 "Number of gclog files in rotation " \ 2598 "(default: 0, no rotation)") \ 2599 range(0, max_uintx) \ 2600 \ 2601 product(size_t, GCLogFileSize, 8*K, \ 2602 "GC log file size, requires UseGCLogFileRotation. " \ 2603 "Set to 0 to only trigger rotation via jcmd") \ 2604 range(0, max_uintx) \ 2605 \ 2606 /* JVMTI heap profiling */ \ 2607 \ 2608 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2609 "Trace JVMTI object tagging calls") \ 2610 \ 2611 diagnostic(bool, VerifyBeforeIteration, false, \ 2612 "Verify memory system before JVMTI iteration") \ 2613 \ 2614 /* compiler interface */ \ 2615 \ 2616 develop(bool, CIPrintCompilerName, false, \ 2617 "when CIPrint is active, print the name of the active compiler") \ 2618 \ 2619 diagnostic(bool, CIPrintCompileQueue, false, \ 2620 "display the contents of the compile queue whenever a " \ 2621 "compilation is enqueued") \ 2622 \ 2623 develop(bool, CIPrintRequests, false, \ 2624 "display every request for compilation") \ 2625 \ 2626 product(bool, CITime, false, \ 2627 "collect timing information for compilation") \ 2628 \ 2629 develop(bool, CITimeVerbose, false, \ 2630 "be more verbose in compilation timings") \ 2631 \ 2632 develop(bool, CITimeEach, false, \ 2633 "display timing information after each successful compilation") \ 2634 \ 2635 develop(bool, CICountOSR, false, \ 2636 "use a separate counter when assigning ids to osr compilations") \ 2637 \ 2638 develop(bool, CICompileNatives, true, \ 2639 "compile native methods if supported by the compiler") \ 2640 \ 2641 develop_pd(bool, CICompileOSR, \ 2642 "compile on stack replacement methods if supported by the " \ 2643 "compiler") \ 2644 \ 2645 develop(bool, CIPrintMethodCodes, false, \ 2646 "print method bytecodes of the compiled code") \ 2647 \ 2648 develop(bool, CIPrintTypeFlow, false, \ 2649 "print the results of ciTypeFlow analysis") \ 2650 \ 2651 develop(bool, CITraceTypeFlow, false, \ 2652 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2653 \ 2654 develop(intx, OSROnlyBCI, -1, \ 2655 "OSR only at this bci. Negative values mean exclude that bci") \ 2656 \ 2657 /* compiler */ \ 2658 \ 2659 /* notice: the max range value here is max_jint, not max_intx */ \ 2660 /* because of overflow issue */ \ 2661 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2662 "Number of compiler threads to run") \ 2663 range(0, max_jint) \ 2664 constraint(CICompilerCountConstraintFunc, AtParse) \ 2665 \ 2666 product(intx, CompilationPolicyChoice, 0, \ 2667 "which compilation policy (0-3)") \ 2668 range(0, 3) \ 2669 \ 2670 develop(bool, UseStackBanging, true, \ 2671 "use stack banging for stack overflow checks (required for " \ 2672 "proper StackOverflow handling; disable only to measure cost " \ 2673 "of stackbanging)") \ 2674 \ 2675 develop(bool, UseStrictFP, true, \ 2676 "use strict fp if modifier strictfp is set") \ 2677 \ 2678 develop(bool, GenerateSynchronizationCode, true, \ 2679 "generate locking/unlocking code for synchronized methods and " \ 2680 "monitors") \ 2681 \ 2682 develop(bool, GenerateCompilerNullChecks, true, \ 2683 "Generate explicit null checks for loads/stores/calls") \ 2684 \ 2685 develop(bool, GenerateRangeChecks, true, \ 2686 "Generate range checks for array accesses") \ 2687 \ 2688 develop_pd(bool, ImplicitNullChecks, \ 2689 "Generate code for implicit null checks") \ 2690 \ 2691 product_pd(bool, TrapBasedNullChecks, \ 2692 "Generate code for null checks that uses a cmp and trap " \ 2693 "instruction raising SIGTRAP. This is only used if an access to" \ 2694 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2695 "ImplicitNullChecks don't work (PPC64).") \ 2696 \ 2697 product(bool, PrintSafepointStatistics, false, \ 2698 "Print statistics about safepoint synchronization") \ 2699 \ 2700 product(intx, PrintSafepointStatisticsCount, 300, \ 2701 "Total number of safepoint statistics collected " \ 2702 "before printing them out") \ 2703 range(1, max_intx) \ 2704 \ 2705 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2706 "Print safepoint statistics only when safepoint takes " \ 2707 "more than PrintSafepointSatisticsTimeout in millis") \ 2708 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2709 NOT_LP64(range(-1, max_intx)) \ 2710 \ 2711 product(bool, TraceSafepointCleanupTime, false, \ 2712 "Print the break down of clean up tasks performed during " \ 2713 "safepoint") \ 2714 \ 2715 product(bool, Inline, true, \ 2716 "Enable inlining") \ 2717 \ 2718 product(bool, ClipInlining, true, \ 2719 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2720 \ 2721 develop(bool, UseCHA, true, \ 2722 "Enable CHA") \ 2723 \ 2724 product(bool, UseTypeProfile, true, \ 2725 "Check interpreter profile for historically monomorphic calls") \ 2726 \ 2727 diagnostic(bool, PrintInlining, false, \ 2728 "Print inlining optimizations") \ 2729 \ 2730 product(bool, UsePopCountInstruction, false, \ 2731 "Use population count instruction") \ 2732 \ 2733 develop(bool, EagerInitialization, false, \ 2734 "Eagerly initialize classes if possible") \ 2735 \ 2736 diagnostic(bool, LogTouchedMethods, false, \ 2737 "Log methods which have been ever touched in runtime") \ 2738 \ 2739 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2740 "Print all methods that have been ever touched in runtime") \ 2741 \ 2742 develop(bool, TraceMethodReplacement, false, \ 2743 "Print when methods are replaced do to recompilation") \ 2744 \ 2745 develop(bool, PrintMethodFlushing, false, \ 2746 "Print the nmethods being flushed") \ 2747 \ 2748 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2749 "print statistics about method flushing") \ 2750 \ 2751 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2752 "Number of compiled code invocations after which " \ 2753 "the method is considered as hot by the flusher") \ 2754 range(1, max_jint) \ 2755 \ 2756 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2757 "Minimum number of sweeper passes before an nmethod " \ 2758 "can be flushed") \ 2759 range(0, max_intx) \ 2760 \ 2761 product(bool, UseCodeAging, true, \ 2762 "Insert counter to detect warm methods") \ 2763 \ 2764 diagnostic(bool, StressCodeAging, false, \ 2765 "Start with counters compiled in") \ 2766 \ 2767 develop(bool, UseRelocIndex, false, \ 2768 "Use an index to speed random access to relocations") \ 2769 \ 2770 develop(bool, StressCodeBuffers, false, \ 2771 "Exercise code buffer expansion and other rare state changes") \ 2772 \ 2773 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2774 "Generate extra debugging information for non-safepoints in " \ 2775 "nmethods") \ 2776 \ 2777 product(bool, PrintVMOptions, false, \ 2778 "Print flags that appeared on the command line") \ 2779 \ 2780 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2781 "Ignore unrecognized VM options") \ 2782 \ 2783 product(bool, PrintCommandLineFlags, false, \ 2784 "Print flags specified on command line or set by ergonomics") \ 2785 \ 2786 product(bool, PrintFlagsInitial, false, \ 2787 "Print all VM flags before argument processing and exit VM") \ 2788 \ 2789 product(bool, PrintFlagsFinal, false, \ 2790 "Print all VM flags after argument and ergonomic processing") \ 2791 \ 2792 notproduct(bool, PrintFlagsWithComments, false, \ 2793 "Print all VM flags with default values and descriptions and " \ 2794 "exit") \ 2795 \ 2796 product(bool, PrintFlagsRanges, false, \ 2797 "Print VM flags and their ranges and exit VM") \ 2798 \ 2799 diagnostic(bool, SerializeVMOutput, true, \ 2800 "Use a mutex to serialize output to tty and LogFile") \ 2801 \ 2802 diagnostic(bool, DisplayVMOutput, true, \ 2803 "Display all VM output on the tty, independently of LogVMOutput") \ 2804 \ 2805 diagnostic(bool, LogVMOutput, false, \ 2806 "Save VM output to LogFile") \ 2807 \ 2808 diagnostic(ccstr, LogFile, NULL, \ 2809 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2810 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2811 \ 2812 product(ccstr, ErrorFile, NULL, \ 2813 "If an error occurs, save the error data to this file " \ 2814 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2815 \ 2816 product(bool, DisplayVMOutputToStderr, false, \ 2817 "If DisplayVMOutput is true, display all VM output to stderr") \ 2818 \ 2819 product(bool, DisplayVMOutputToStdout, false, \ 2820 "If DisplayVMOutput is true, display all VM output to stdout") \ 2821 \ 2822 product(bool, UseHeavyMonitors, false, \ 2823 "use heavyweight instead of lightweight Java monitors") \ 2824 \ 2825 product(bool, PrintStringTableStatistics, false, \ 2826 "print statistics about the StringTable and SymbolTable") \ 2827 \ 2828 diagnostic(bool, VerifyStringTableAtExit, false, \ 2829 "verify StringTable contents at exit") \ 2830 \ 2831 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2832 "print histogram of the symbol table") \ 2833 \ 2834 notproduct(bool, ExitVMOnVerifyError, false, \ 2835 "standard exit from VM if bytecode verify error " \ 2836 "(only in debug mode)") \ 2837 \ 2838 diagnostic(ccstr, AbortVMOnException, NULL, \ 2839 "Call fatal if this exception is thrown. Example: " \ 2840 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2841 \ 2842 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2843 "Call fatal if the exception pointed by AbortVMOnException " \ 2844 "has this message") \ 2845 \ 2846 develop(bool, DebugVtables, false, \ 2847 "add debugging code to vtable dispatch") \ 2848 \ 2849 develop(bool, PrintVtables, false, \ 2850 "print vtables when printing klass") \ 2851 \ 2852 notproduct(bool, PrintVtableStats, false, \ 2853 "print vtables stats at end of run") \ 2854 \ 2855 develop(bool, TraceCreateZombies, false, \ 2856 "trace creation of zombie nmethods") \ 2857 \ 2858 notproduct(bool, IgnoreLockingAssertions, false, \ 2859 "disable locking assertions (for speed)") \ 2860 \ 2861 product(bool, RangeCheckElimination, true, \ 2862 "Eliminate range checks") \ 2863 \ 2864 develop_pd(bool, UncommonNullCast, \ 2865 "track occurrences of null in casts; adjust compiler tactics") \ 2866 \ 2867 develop(bool, TypeProfileCasts, true, \ 2868 "treat casts like calls for purposes of type profiling") \ 2869 \ 2870 develop(bool, DelayCompilationDuringStartup, true, \ 2871 "Delay invoking the compiler until main application class is " \ 2872 "loaded") \ 2873 \ 2874 develop(bool, CompileTheWorld, false, \ 2875 "Compile all methods in all classes in bootstrap class path " \ 2876 "(stress test)") \ 2877 \ 2878 develop(bool, CompileTheWorldPreloadClasses, true, \ 2879 "Preload all classes used by a class before start loading") \ 2880 \ 2881 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2882 "Force a safepoint every n compiles so sweeper can keep up") \ 2883 \ 2884 develop(bool, FillDelaySlots, true, \ 2885 "Fill delay slots (on SPARC only)") \ 2886 \ 2887 develop(bool, TimeLivenessAnalysis, false, \ 2888 "Time computation of bytecode liveness analysis") \ 2889 \ 2890 develop(bool, TraceLivenessGen, false, \ 2891 "Trace the generation of liveness analysis information") \ 2892 \ 2893 notproduct(bool, TraceLivenessQuery, false, \ 2894 "Trace queries of liveness analysis information") \ 2895 \ 2896 notproduct(bool, CollectIndexSetStatistics, false, \ 2897 "Collect information about IndexSets") \ 2898 \ 2899 develop(bool, UseLoopSafepoints, true, \ 2900 "Generate Safepoint nodes in every loop") \ 2901 \ 2902 develop(intx, FastAllocateSizeLimit, 128*K, \ 2903 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2904 "Inline allocations larger than this in doublewords must go slow")\ 2905 \ 2906 product(bool, AggressiveOpts, false, \ 2907 "Enable aggressive optimizations - see arguments.cpp") \ 2908 \ 2909 product_pd(bool, CompactStrings, \ 2910 "Enable Strings to use single byte chars in backing store") \ 2911 \ 2912 product_pd(uintx, TypeProfileLevel, \ 2913 "=XYZ, with Z: Type profiling of arguments at call; " \ 2914 "Y: Type profiling of return value at call; " \ 2915 "X: Type profiling of parameters to methods; " \ 2916 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2917 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2918 \ 2919 product(intx, TypeProfileArgsLimit, 2, \ 2920 "max number of call arguments to consider for type profiling") \ 2921 range(0, 16) \ 2922 \ 2923 product(intx, TypeProfileParmsLimit, 2, \ 2924 "max number of incoming parameters to consider for type profiling"\ 2925 ", -1 for all") \ 2926 range(-1, 64) \ 2927 \ 2928 /* statistics */ \ 2929 develop(bool, CountCompiledCalls, false, \ 2930 "Count method invocations") \ 2931 \ 2932 notproduct(bool, CountRuntimeCalls, false, \ 2933 "Count VM runtime calls") \ 2934 \ 2935 develop(bool, CountJNICalls, false, \ 2936 "Count jni method invocations") \ 2937 \ 2938 notproduct(bool, CountJVMCalls, false, \ 2939 "Count jvm method invocations") \ 2940 \ 2941 notproduct(bool, CountRemovableExceptions, false, \ 2942 "Count exceptions that could be replaced by branches due to " \ 2943 "inlining") \ 2944 \ 2945 notproduct(bool, ICMissHistogram, false, \ 2946 "Produce histogram of IC misses") \ 2947 \ 2948 /* interpreter */ \ 2949 develop(bool, ClearInterpreterLocals, false, \ 2950 "Always clear local variables of interpreter activations upon " \ 2951 "entry") \ 2952 \ 2953 product_pd(bool, RewriteBytecodes, \ 2954 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2955 \ 2956 product_pd(bool, RewriteFrequentPairs, \ 2957 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2958 \ 2959 diagnostic(bool, PrintInterpreter, false, \ 2960 "Print the generated interpreter code") \ 2961 \ 2962 product(bool, UseInterpreter, true, \ 2963 "Use interpreter for non-compiled methods") \ 2964 \ 2965 develop(bool, UseFastSignatureHandlers, true, \ 2966 "Use fast signature handlers for native calls") \ 2967 \ 2968 product(bool, UseLoopCounter, true, \ 2969 "Increment invocation counter on backward branch") \ 2970 \ 2971 product_pd(bool, UseOnStackReplacement, \ 2972 "Use on stack replacement, calls runtime if invoc. counter " \ 2973 "overflows in loop") \ 2974 \ 2975 notproduct(bool, TraceOnStackReplacement, false, \ 2976 "Trace on stack replacement") \ 2977 \ 2978 product_pd(bool, PreferInterpreterNativeStubs, \ 2979 "Use always interpreter stubs for native methods invoked via " \ 2980 "interpreter") \ 2981 \ 2982 develop(bool, CountBytecodes, false, \ 2983 "Count number of bytecodes executed") \ 2984 \ 2985 develop(bool, PrintBytecodeHistogram, false, \ 2986 "Print histogram of the executed bytecodes") \ 2987 \ 2988 develop(bool, PrintBytecodePairHistogram, false, \ 2989 "Print histogram of the executed bytecode pairs") \ 2990 \ 2991 diagnostic(bool, PrintSignatureHandlers, false, \ 2992 "Print code generated for native method signature handlers") \ 2993 \ 2994 develop(bool, VerifyOops, false, \ 2995 "Do plausibility checks for oops") \ 2996 \ 2997 develop(bool, CheckUnhandledOops, false, \ 2998 "Check for unhandled oops in VM code") \ 2999 \ 3000 develop(bool, VerifyJNIFields, trueInDebug, \ 3001 "Verify jfieldIDs for instance fields") \ 3002 \ 3003 notproduct(bool, VerifyJNIEnvThread, false, \ 3004 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 3005 "from JNI") \ 3006 \ 3007 develop(bool, VerifyFPU, false, \ 3008 "Verify FPU state (check for NaN's, etc.)") \ 3009 \ 3010 develop(bool, VerifyThread, false, \ 3011 "Watch the thread register for corruption (SPARC only)") \ 3012 \ 3013 develop(bool, VerifyActivationFrameSize, false, \ 3014 "Verify that activation frame didn't become smaller than its " \ 3015 "minimal size") \ 3016 \ 3017 develop(bool, TraceFrequencyInlining, false, \ 3018 "Trace frequency based inlining") \ 3019 \ 3020 develop_pd(bool, InlineIntrinsics, \ 3021 "Inline intrinsics that can be statically resolved") \ 3022 \ 3023 product_pd(bool, ProfileInterpreter, \ 3024 "Profile at the bytecode level during interpretation") \ 3025 \ 3026 develop(bool, TraceProfileInterpreter, false, \ 3027 "Trace profiling at the bytecode level during interpretation. " \ 3028 "This outputs the profiling information collected to improve " \ 3029 "jit compilation.") \ 3030 \ 3031 develop_pd(bool, ProfileTraps, \ 3032 "Profile deoptimization traps at the bytecode level") \ 3033 \ 3034 product(intx, ProfileMaturityPercentage, 20, \ 3035 "number of method invocations/branches (expressed as % of " \ 3036 "CompileThreshold) before using the method's profile") \ 3037 range(0, 100) \ 3038 \ 3039 diagnostic(bool, PrintMethodData, false, \ 3040 "Print the results of +ProfileInterpreter at end of run") \ 3041 \ 3042 develop(bool, VerifyDataPointer, trueInDebug, \ 3043 "Verify the method data pointer during interpreter profiling") \ 3044 \ 3045 develop(bool, VerifyCompiledCode, false, \ 3046 "Include miscellaneous runtime verifications in nmethod code; " \ 3047 "default off because it disturbs nmethod size heuristics") \ 3048 \ 3049 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 3050 "Manually make GC thread crash then dump java stack trace; " \ 3051 "Test only") \ 3052 \ 3053 /* compilation */ \ 3054 product(bool, UseCompiler, true, \ 3055 "Use Just-In-Time compilation") \ 3056 \ 3057 develop(bool, TraceCompilationPolicy, false, \ 3058 "Trace compilation policy") \ 3059 \ 3060 develop(bool, TimeCompilationPolicy, false, \ 3061 "Time the compilation policy") \ 3062 \ 3063 product(bool, UseCounterDecay, true, \ 3064 "Adjust recompilation counters") \ 3065 \ 3066 develop(intx, CounterHalfLifeTime, 30, \ 3067 "Half-life time of invocation counters (in seconds)") \ 3068 \ 3069 develop(intx, CounterDecayMinIntervalLength, 500, \ 3070 "The minimum interval (in milliseconds) between invocation of " \ 3071 "CounterDecay") \ 3072 \ 3073 product(bool, AlwaysCompileLoopMethods, false, \ 3074 "When using recompilation, never interpret methods " \ 3075 "containing loops") \ 3076 \ 3077 product(bool, DontCompileHugeMethods, true, \ 3078 "Do not compile methods > HugeMethodLimit") \ 3079 \ 3080 /* Bytecode escape analysis estimation. */ \ 3081 product(bool, EstimateArgEscape, true, \ 3082 "Analyze bytecodes to estimate escape state of arguments") \ 3083 \ 3084 product(intx, BCEATraceLevel, 0, \ 3085 "How much tracing to do of bytecode escape analysis estimates " \ 3086 "(0-3)") \ 3087 range(0, 3) \ 3088 \ 3089 product(intx, MaxBCEAEstimateLevel, 5, \ 3090 "Maximum number of nested calls that are analyzed by BC EA") \ 3091 range(0, max_jint) \ 3092 \ 3093 product(intx, MaxBCEAEstimateSize, 150, \ 3094 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3095 range(0, max_jint) \ 3096 \ 3097 product(intx, AllocatePrefetchStyle, 1, \ 3098 "0 = no prefetch, " \ 3099 "1 = prefetch instructions for each allocation, " \ 3100 "2 = use TLAB watermark to gate allocation prefetch, " \ 3101 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3102 range(0, 3) \ 3103 \ 3104 product(intx, AllocatePrefetchDistance, -1, \ 3105 "Distance to prefetch ahead of allocation pointer. " \ 3106 "-1: use system-specific value (automatically determined") \ 3107 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 3108 \ 3109 product(intx, AllocatePrefetchLines, 3, \ 3110 "Number of lines to prefetch ahead of array allocation pointer") \ 3111 range(1, max_jint / 2) \ 3112 \ 3113 product(intx, AllocateInstancePrefetchLines, 1, \ 3114 "Number of lines to prefetch ahead of instance allocation " \ 3115 "pointer") \ 3116 range(1, max_jint / 2) \ 3117 \ 3118 product(intx, AllocatePrefetchStepSize, 16, \ 3119 "Step size in bytes of sequential prefetch instructions") \ 3120 range(1, max_jint) \ 3121 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 3122 \ 3123 product(intx, AllocatePrefetchInstr, 0, \ 3124 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3125 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \ 3126 \ 3127 /* deoptimization */ \ 3128 develop(bool, TraceDeoptimization, false, \ 3129 "Trace deoptimization") \ 3130 \ 3131 develop(bool, PrintDeoptimizationDetails, false, \ 3132 "Print more information about deoptimization") \ 3133 \ 3134 develop(bool, DebugDeoptimization, false, \ 3135 "Tracing various information while debugging deoptimization") \ 3136 \ 3137 product(intx, SelfDestructTimer, 0, \ 3138 "Will cause VM to terminate after a given time (in minutes) " \ 3139 "(0 means off)") \ 3140 range(0, max_intx) \ 3141 \ 3142 product(intx, MaxJavaStackTraceDepth, 1024, \ 3143 "The maximum number of lines in the stack trace for Java " \ 3144 "exceptions (0 means all)") \ 3145 range(0, max_jint/2) \ 3146 \ 3147 develop(bool, TraceStackWalk, false, \ 3148 "Trace stack walking") \ 3149 \ 3150 product(bool, MemberNameInStackFrame, true, \ 3151 "Use MemberName in StackFrame") \ 3152 \ 3153 /* notice: the max range value here is max_jint, not max_intx */ \ 3154 /* because of overflow issue */ \ 3155 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3156 "Guarantee a safepoint (at least) every so many milliseconds " \ 3157 "(0 means none)")) \ 3158 NOT_EMBEDDED(range(0, max_jint)) \ 3159 \ 3160 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3161 "Guarantee a safepoint (at least) every so many milliseconds " \ 3162 "(0 means none)")) \ 3163 EMBEDDED_ONLY(range(0, max_jint)) \ 3164 \ 3165 product(intx, SafepointTimeoutDelay, 10000, \ 3166 "Delay in milliseconds for option SafepointTimeout") \ 3167 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 3168 NOT_LP64(range(0, max_intx)) \ 3169 \ 3170 product(intx, NmethodSweepActivity, 10, \ 3171 "Removes cold nmethods from code cache if > 0. Higher values " \ 3172 "result in more aggressive sweeping") \ 3173 range(0, 2000) \ 3174 \ 3175 notproduct(bool, LogSweeper, false, \ 3176 "Keep a ring buffer of sweeper activity") \ 3177 \ 3178 notproduct(intx, SweeperLogEntries, 1024, \ 3179 "Number of records in the ring buffer of sweeper activity") \ 3180 \ 3181 notproduct(intx, MemProfilingInterval, 500, \ 3182 "Time between each invocation of the MemProfiler") \ 3183 \ 3184 develop(intx, MallocCatchPtr, -1, \ 3185 "Hit breakpoint when mallocing/freeing this pointer") \ 3186 \ 3187 notproduct(ccstrlist, SuppressErrorAt, "", \ 3188 "List of assertions (file:line) to muzzle") \ 3189 \ 3190 notproduct(size_t, HandleAllocationLimit, 1024, \ 3191 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3192 "is used") \ 3193 \ 3194 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3195 "Threshold for total handle allocation when " \ 3196 "+TraceHandleAllocation is used") \ 3197 \ 3198 develop(intx, StackPrintLimit, 100, \ 3199 "number of stack frames to print in VM-level stack dump") \ 3200 \ 3201 notproduct(intx, MaxElementPrintSize, 256, \ 3202 "maximum number of elements to print") \ 3203 \ 3204 notproduct(intx, MaxSubklassPrintSize, 4, \ 3205 "maximum number of subklasses to print when printing klass") \ 3206 \ 3207 product(intx, MaxInlineLevel, 9, \ 3208 "maximum number of nested calls that are inlined") \ 3209 range(0, max_jint) \ 3210 \ 3211 product(intx, MaxRecursiveInlineLevel, 1, \ 3212 "maximum number of nested recursive calls that are inlined") \ 3213 range(0, max_jint) \ 3214 \ 3215 develop(intx, MaxForceInlineLevel, 100, \ 3216 "maximum number of nested calls that are forced for inlining " \ 3217 "(using CompileCommand or marked w/ @ForceInline)") \ 3218 range(0, max_jint) \ 3219 \ 3220 product_pd(intx, InlineSmallCode, \ 3221 "Only inline already compiled methods if their code size is " \ 3222 "less than this") \ 3223 range(0, max_jint) \ 3224 \ 3225 product(intx, MaxInlineSize, 35, \ 3226 "The maximum bytecode size of a method to be inlined") \ 3227 range(0, max_jint) \ 3228 \ 3229 product_pd(intx, FreqInlineSize, \ 3230 "The maximum bytecode size of a frequent method to be inlined") \ 3231 range(0, max_jint) \ 3232 \ 3233 product(intx, MaxTrivialSize, 6, \ 3234 "The maximum bytecode size of a trivial method to be inlined") \ 3235 range(0, max_jint) \ 3236 \ 3237 product(intx, MinInliningThreshold, 250, \ 3238 "The minimum invocation count a method needs to have to be " \ 3239 "inlined") \ 3240 range(0, max_jint) \ 3241 \ 3242 develop(intx, MethodHistogramCutoff, 100, \ 3243 "The cutoff value for method invocation histogram (+CountCalls)") \ 3244 \ 3245 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3246 "Number of interpreted methods to show in profile") \ 3247 \ 3248 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3249 "Number of compiled methods to show in profile") \ 3250 \ 3251 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3252 "Number of stub methods to show in profile") \ 3253 \ 3254 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3255 "Number of runtime stub nodes to show in profile") \ 3256 \ 3257 product(intx, ProfileIntervalsTicks, 100, \ 3258 "Number of ticks between printing of interval profile " \ 3259 "(+ProfileIntervals)") \ 3260 range(0, max_intx) \ 3261 \ 3262 notproduct(intx, ScavengeALotInterval, 1, \ 3263 "Interval between which scavenge will occur with +ScavengeALot") \ 3264 \ 3265 notproduct(intx, FullGCALotInterval, 1, \ 3266 "Interval between which full gc will occur with +FullGCALot") \ 3267 \ 3268 notproduct(intx, FullGCALotStart, 0, \ 3269 "For which invocation to start FullGCAlot") \ 3270 \ 3271 notproduct(intx, FullGCALotDummies, 32*K, \ 3272 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3273 "to move") \ 3274 \ 3275 develop(intx, DontYieldALotInterval, 10, \ 3276 "Interval between which yields will be dropped (milliseconds)") \ 3277 \ 3278 develop(intx, MinSleepInterval, 1, \ 3279 "Minimum sleep() interval (milliseconds) when " \ 3280 "ConvertSleepToYield is off (used for Solaris)") \ 3281 \ 3282 develop(intx, ProfilerPCTickThreshold, 15, \ 3283 "Number of ticks in a PC buckets to be a hotspot") \ 3284 \ 3285 notproduct(intx, DeoptimizeALotInterval, 5, \ 3286 "Number of exits until DeoptimizeALot kicks in") \ 3287 \ 3288 notproduct(intx, ZombieALotInterval, 5, \ 3289 "Number of exits until ZombieALot kicks in") \ 3290 \ 3291 diagnostic(intx, MallocVerifyInterval, 0, \ 3292 "If non-zero, verify C heap after every N calls to " \ 3293 "malloc/realloc/free") \ 3294 range(0, max_intx) \ 3295 \ 3296 diagnostic(intx, MallocVerifyStart, 0, \ 3297 "If non-zero, start verifying C heap after Nth call to " \ 3298 "malloc/realloc/free") \ 3299 range(0, max_intx) \ 3300 \ 3301 diagnostic(uintx, MallocMaxTestWords, 0, \ 3302 "If non-zero, maximum number of words that malloc/realloc can " \ 3303 "allocate (for testing only)") \ 3304 range(0, max_uintx) \ 3305 \ 3306 product(intx, TypeProfileWidth, 2, \ 3307 "Number of receiver types to record in call/cast profile") \ 3308 range(0, 8) \ 3309 \ 3310 experimental(intx, MethodProfileWidth, 0, \ 3311 "Number of methods to record in call profile") \ 3312 \ 3313 develop(intx, BciProfileWidth, 2, \ 3314 "Number of return bci's to record in ret profile") \ 3315 \ 3316 product(intx, PerMethodRecompilationCutoff, 400, \ 3317 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3318 range(-1, max_intx) \ 3319 \ 3320 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3321 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3322 range(-1, max_intx) \ 3323 \ 3324 product(intx, PerMethodTrapLimit, 100, \ 3325 "Limit on traps (of one kind) in a method (includes inlines)") \ 3326 range(0, max_jint) \ 3327 \ 3328 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3329 "Limit on speculative traps (of one kind) in a method " \ 3330 "(includes inlines)") \ 3331 range(0, max_jint) \ 3332 \ 3333 product(intx, PerBytecodeTrapLimit, 4, \ 3334 "Limit on traps (of one kind) at a particular BCI") \ 3335 range(0, max_jint) \ 3336 \ 3337 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3338 "Extra method data trap entries for speculation") \ 3339 \ 3340 develop(intx, InlineFrequencyRatio, 20, \ 3341 "Ratio of call site execution to caller method invocation") \ 3342 range(0, max_jint) \ 3343 \ 3344 develop_pd(intx, InlineFrequencyCount, \ 3345 "Count of call site execution necessary to trigger frequent " \ 3346 "inlining") \ 3347 range(0, max_jint) \ 3348 \ 3349 develop(intx, InlineThrowCount, 50, \ 3350 "Force inlining of interpreted methods that throw this often") \ 3351 range(0, max_jint) \ 3352 \ 3353 develop(intx, InlineThrowMaxSize, 200, \ 3354 "Force inlining of throwing methods smaller than this") \ 3355 range(0, max_jint) \ 3356 \ 3357 develop(intx, ProfilerNodeSize, 1024, \ 3358 "Size in K to allocate for the Profile Nodes of each thread") \ 3359 range(0, 1024) \ 3360 \ 3361 /* gc parameters */ \ 3362 product(size_t, InitialHeapSize, 0, \ 3363 "Initial heap size (in bytes); zero means use ergonomics") \ 3364 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3365 \ 3366 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3367 "Maximum heap size (in bytes)") \ 3368 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3369 \ 3370 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3371 "Initial tenured generation size (in bytes)") \ 3372 range(0, max_uintx) \ 3373 \ 3374 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3375 "Initial new generation size (in bytes)") \ 3376 constraint(NewSizeConstraintFunc,AfterErgo) \ 3377 \ 3378 product(size_t, MaxNewSize, max_uintx, \ 3379 "Maximum new generation size (in bytes), max_uintx means set " \ 3380 "ergonomically") \ 3381 range(0, max_uintx) \ 3382 \ 3383 product_pd(size_t, HeapBaseMinAddress, \ 3384 "OS specific low limit for heap base address") \ 3385 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3386 \ 3387 product(size_t, PretenureSizeThreshold, 0, \ 3388 "Maximum size in bytes of objects allocated in DefNew " \ 3389 "generation; zero means no maximum") \ 3390 range(0, max_uintx) \ 3391 \ 3392 product(size_t, MinTLABSize, 2*K, \ 3393 "Minimum allowed TLAB size (in bytes)") \ 3394 range(1, max_uintx) \ 3395 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3396 \ 3397 product(size_t, TLABSize, 0, \ 3398 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3399 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3400 \ 3401 product(size_t, YoungPLABSize, 4096, \ 3402 "Size of young gen promotion LAB's (in HeapWords)") \ 3403 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3404 \ 3405 product(size_t, OldPLABSize, 1024, \ 3406 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3407 "of blocks to attempt to claim when refilling CMS LAB's") \ 3408 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3409 \ 3410 product(uintx, TLABAllocationWeight, 35, \ 3411 "Allocation averaging weight") \ 3412 range(0, 100) \ 3413 \ 3414 /* Limit the lower bound of this flag to 1 as it is used */ \ 3415 /* in a division expression. */ \ 3416 product(uintx, TLABWasteTargetPercent, 1, \ 3417 "Percentage of Eden that can be wasted") \ 3418 range(1, 100) \ 3419 \ 3420 product(uintx, TLABRefillWasteFraction, 64, \ 3421 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3422 range(1, max_juint) \ 3423 \ 3424 product(uintx, TLABWasteIncrement, 4, \ 3425 "Increment allowed waste at slow allocation") \ 3426 range(0, max_jint) \ 3427 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3428 \ 3429 product(uintx, SurvivorRatio, 8, \ 3430 "Ratio of eden/survivor space size") \ 3431 range(1, max_uintx-2) \ 3432 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3433 \ 3434 product(uintx, NewRatio, 2, \ 3435 "Ratio of old/new generation sizes") \ 3436 range(0, max_uintx-1) \ 3437 \ 3438 product_pd(size_t, NewSizeThreadIncrease, \ 3439 "Additional size added to desired new generation size per " \ 3440 "non-daemon thread (in bytes)") \ 3441 range(0, max_uintx) \ 3442 \ 3443 product_pd(size_t, MetaspaceSize, \ 3444 "Initial size of Metaspaces (in bytes)") \ 3445 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3446 \ 3447 product(size_t, MaxMetaspaceSize, max_uintx, \ 3448 "Maximum size of Metaspaces (in bytes)") \ 3449 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3450 \ 3451 product(size_t, CompressedClassSpaceSize, 1*G, \ 3452 "Maximum size of class area in Metaspace when compressed " \ 3453 "class pointers are used") \ 3454 range(1*M, 3*G) \ 3455 \ 3456 manageable(uintx, MinHeapFreeRatio, 40, \ 3457 "The minimum percentage of heap free after GC to avoid expansion."\ 3458 " For most GCs this applies to the old generation. In G1 and" \ 3459 " ParallelGC it applies to the whole heap.") \ 3460 range(0, 100) \ 3461 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3462 \ 3463 manageable(uintx, MaxHeapFreeRatio, 70, \ 3464 "The maximum percentage of heap free after GC to avoid shrinking."\ 3465 " For most GCs this applies to the old generation. In G1 and" \ 3466 " ParallelGC it applies to the whole heap.") \ 3467 range(0, 100) \ 3468 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3469 \ 3470 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3471 "Number of milliseconds per MB of free space in the heap") \ 3472 range(0, max_intx) \ 3473 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3474 \ 3475 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3476 "The minimum change in heap space due to GC (in bytes)") \ 3477 range(0, max_uintx) \ 3478 \ 3479 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3480 "The minimum expansion of Metaspace (in bytes)") \ 3481 range(0, max_uintx) \ 3482 \ 3483 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3484 "The maximum percentage of Metaspace free after GC to avoid " \ 3485 "shrinking") \ 3486 range(0, 100) \ 3487 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3488 \ 3489 product(uintx, MinMetaspaceFreeRatio, 40, \ 3490 "The minimum percentage of Metaspace free after GC to avoid " \ 3491 "expansion") \ 3492 range(0, 99) \ 3493 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3494 \ 3495 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3496 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3497 range(0, max_uintx) \ 3498 \ 3499 product(uintx, QueuedAllocationWarningCount, 0, \ 3500 "Number of times an allocation that queues behind a GC " \ 3501 "will retry before printing a warning") \ 3502 range(0, max_uintx) \ 3503 \ 3504 diagnostic(uintx, VerifyGCStartAt, 0, \ 3505 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3506 range(0, max_uintx) \ 3507 \ 3508 diagnostic(intx, VerifyGCLevel, 0, \ 3509 "Generation level at which to start +VerifyBefore/AfterGC") \ 3510 range(0, 1) \ 3511 \ 3512 product(uintx, MaxTenuringThreshold, 15, \ 3513 "Maximum value for tenuring threshold") \ 3514 range(0, markOopDesc::max_age + 1) \ 3515 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3516 \ 3517 product(uintx, InitialTenuringThreshold, 7, \ 3518 "Initial value for tenuring threshold") \ 3519 range(0, markOopDesc::max_age + 1) \ 3520 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3521 \ 3522 product(uintx, TargetSurvivorRatio, 50, \ 3523 "Desired percentage of survivor space used after scavenge") \ 3524 range(0, 100) \ 3525 \ 3526 product(uintx, MarkSweepDeadRatio, 5, \ 3527 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3528 "Serial mark sweep treats this as both the minimum and maximum " \ 3529 "value. " \ 3530 "CMS uses this value only if it falls back to mark sweep. " \ 3531 "Par compact uses a variable scale based on the density of the " \ 3532 "generation and treats this as the maximum value when the heap " \ 3533 "is either completely full or completely empty. Par compact " \ 3534 "also has a smaller default value; see arguments.cpp.") \ 3535 range(0, 100) \ 3536 \ 3537 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3538 "How often should we fully compact the heap (ignoring the dead " \ 3539 "space parameters)") \ 3540 range(1, max_uintx) \ 3541 \ 3542 product(intx, PrintCMSStatistics, 0, \ 3543 "Statistics for CMS") \ 3544 range(0, 2) \ 3545 \ 3546 product(bool, PrintCMSInitiationStatistics, false, \ 3547 "Statistics for initiating a CMS collection") \ 3548 \ 3549 product(intx, PrintFLSStatistics, 0, \ 3550 "Statistics for CMS' FreeListSpace") \ 3551 range(0, 2) \ 3552 \ 3553 product(intx, PrintFLSCensus, 0, \ 3554 "Census for CMS' FreeListSpace") \ 3555 range(0, 1) \ 3556 \ 3557 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3558 "Delay between expansion and allocation (in milliseconds)") \ 3559 \ 3560 develop(uintx, GCWorkerDelayMillis, 0, \ 3561 "Delay in scheduling GC workers (in milliseconds)") \ 3562 \ 3563 product(intx, DeferThrSuspendLoopCount, 4000, \ 3564 "(Unstable) Number of times to iterate in safepoint loop " \ 3565 "before blocking VM threads ") \ 3566 range(-1, max_jint-1) \ 3567 \ 3568 product(intx, DeferPollingPageLoopCount, -1, \ 3569 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3570 "before changing safepoint polling page to RO ") \ 3571 range(-1, max_jint-1) \ 3572 \ 3573 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3574 range(0, max_intx) \ 3575 \ 3576 product(bool, PSChunkLargeArrays, true, \ 3577 "Process large arrays in chunks") \ 3578 \ 3579 product(uintx, GCDrainStackTargetSize, 64, \ 3580 "Number of entries we will try to leave on the stack " \ 3581 "during parallel gc") \ 3582 range(0, max_juint) \ 3583 \ 3584 /* stack parameters */ \ 3585 product_pd(intx, StackYellowPages, \ 3586 "Number of yellow zone (recoverable overflows) pages") \ 3587 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3588 \ 3589 product_pd(intx, StackRedPages, \ 3590 "Number of red zone (unrecoverable overflows) pages") \ 3591 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3592 \ 3593 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3594 product_pd(intx, StackShadowPages, \ 3595 "Number of shadow zone (for overflow checking) pages " \ 3596 "this should exceed the depth of the VM and native call stack") \ 3597 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3598 \ 3599 product_pd(intx, ThreadStackSize, \ 3600 "Thread Stack Size (in Kbytes)") \ 3601 range(0, max_intx-os::vm_page_size()) \ 3602 \ 3603 product_pd(intx, VMThreadStackSize, \ 3604 "Non-Java Thread Stack Size (in Kbytes)") \ 3605 range(0, max_intx/(1 * K)) \ 3606 \ 3607 product_pd(intx, CompilerThreadStackSize, \ 3608 "Compiler Thread Stack Size (in Kbytes)") \ 3609 range(0, max_intx /(1 * K)) \ 3610 \ 3611 develop_pd(size_t, JVMInvokeMethodSlack, \ 3612 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3613 \ 3614 /* code cache parameters */ \ 3615 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3616 develop(uintx, CodeCacheSegmentSize, \ 3617 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \ 3618 "Code cache segment size (in bytes) - smallest unit of " \ 3619 "allocation") \ 3620 range(1, 1024) \ 3621 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3622 \ 3623 develop_pd(intx, CodeEntryAlignment, \ 3624 "Code entry alignment for generated code (in bytes)") \ 3625 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3626 \ 3627 product_pd(intx, OptoLoopAlignment, \ 3628 "Align inner loops to zero relative to this modulus") \ 3629 range(1, 16) \ 3630 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3631 \ 3632 product_pd(uintx, InitialCodeCacheSize, \ 3633 "Initial code cache size (in bytes)") \ 3634 range(0, max_uintx) \ 3635 \ 3636 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3637 "Minimum code cache size (in bytes) required to start VM.") \ 3638 range(0, max_uintx) \ 3639 \ 3640 product(bool, SegmentedCodeCache, false, \ 3641 "Use a segmented code cache") \ 3642 \ 3643 product_pd(uintx, ReservedCodeCacheSize, \ 3644 "Reserved code cache size (in bytes) - maximum code cache size") \ 3645 range(0, max_uintx) \ 3646 \ 3647 product_pd(uintx, NonProfiledCodeHeapSize, \ 3648 "Size of code heap with non-profiled methods (in bytes)") \ 3649 range(0, max_uintx) \ 3650 \ 3651 product_pd(uintx, ProfiledCodeHeapSize, \ 3652 "Size of code heap with profiled methods (in bytes)") \ 3653 range(0, max_uintx) \ 3654 \ 3655 product_pd(uintx, NonNMethodCodeHeapSize, \ 3656 "Size of code heap with non-nmethods (in bytes)") \ 3657 range(0, max_uintx) \ 3658 \ 3659 product_pd(uintx, CodeCacheExpansionSize, \ 3660 "Code cache expansion size (in bytes)") \ 3661 range(0, max_uintx) \ 3662 \ 3663 develop_pd(uintx, CodeCacheMinBlockLength, \ 3664 "Minimum number of segments in a code cache block") \ 3665 range(1, 100) \ 3666 \ 3667 notproduct(bool, ExitOnFullCodeCache, false, \ 3668 "Exit the VM if we fill the code cache") \ 3669 \ 3670 product(bool, UseCodeCacheFlushing, true, \ 3671 "Remove cold/old nmethods from the code cache") \ 3672 \ 3673 product(uintx, StartAggressiveSweepingAt, 10, \ 3674 "Start aggressive sweeping if X[%] of the code cache is free." \ 3675 "Segmented code cache: X[%] of the non-profiled heap." \ 3676 "Non-segmented code cache: X[%] of the total code cache") \ 3677 range(0, 100) \ 3678 \ 3679 /* interpreter debugging */ \ 3680 develop(intx, BinarySwitchThreshold, 5, \ 3681 "Minimal number of lookupswitch entries for rewriting to binary " \ 3682 "switch") \ 3683 \ 3684 develop(intx, StopInterpreterAt, 0, \ 3685 "Stop interpreter execution at specified bytecode number") \ 3686 \ 3687 develop(intx, TraceBytecodesAt, 0, \ 3688 "Trace bytecodes starting with specified bytecode number") \ 3689 \ 3690 /* compiler interface */ \ 3691 develop(intx, CIStart, 0, \ 3692 "The id of the first compilation to permit") \ 3693 \ 3694 develop(intx, CIStop, max_jint, \ 3695 "The id of the last compilation to permit") \ 3696 \ 3697 develop(intx, CIStartOSR, 0, \ 3698 "The id of the first osr compilation to permit " \ 3699 "(CICountOSR must be on)") \ 3700 \ 3701 develop(intx, CIStopOSR, max_jint, \ 3702 "The id of the last osr compilation to permit " \ 3703 "(CICountOSR must be on)") \ 3704 \ 3705 develop(intx, CIBreakAtOSR, -1, \ 3706 "The id of osr compilation to break at") \ 3707 \ 3708 develop(intx, CIBreakAt, -1, \ 3709 "The id of compilation to break at") \ 3710 \ 3711 product(ccstrlist, CompileOnly, "", \ 3712 "List of methods (pkg/class.name) to restrict compilation to") \ 3713 \ 3714 product(ccstr, CompileCommandFile, NULL, \ 3715 "Read compiler commands from this file [.hotspot_compiler]") \ 3716 \ 3717 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3718 "Read compiler directives from this file") \ 3719 \ 3720 product(ccstrlist, CompileCommand, "", \ 3721 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3722 \ 3723 develop(bool, ReplayCompiles, false, \ 3724 "Enable replay of compilations from ReplayDataFile") \ 3725 \ 3726 product(ccstr, ReplayDataFile, NULL, \ 3727 "File containing compilation replay information" \ 3728 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3729 \ 3730 product(ccstr, InlineDataFile, NULL, \ 3731 "File containing inlining replay information" \ 3732 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3733 \ 3734 develop(intx, ReplaySuppressInitializers, 2, \ 3735 "Control handling of class initialization during replay: " \ 3736 "0 - don't do anything special; " \ 3737 "1 - treat all class initializers as empty; " \ 3738 "2 - treat class initializers for application classes as empty; " \ 3739 "3 - allow all class initializers to run during bootstrap but " \ 3740 " pretend they are empty after starting replay") \ 3741 range(0, 3) \ 3742 \ 3743 develop(bool, ReplayIgnoreInitErrors, false, \ 3744 "Ignore exceptions thrown during initialization for replay") \ 3745 \ 3746 product(bool, DumpReplayDataOnError, true, \ 3747 "Record replay data for crashing compiler threads") \ 3748 \ 3749 product(bool, CICompilerCountPerCPU, false, \ 3750 "1 compiler thread for log(N CPUs)") \ 3751 \ 3752 develop(intx, CIFireOOMAt, -1, \ 3753 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3754 "(non-negative value throws OOM after this many CI accesses " \ 3755 "in each compile)") \ 3756 notproduct(intx, CICrashAt, -1, \ 3757 "id of compilation to trigger assert in compiler thread for " \ 3758 "the purpose of testing, e.g. generation of replay data") \ 3759 notproduct(bool, CIObjectFactoryVerify, false, \ 3760 "enable potentially expensive verification in ciObjectFactory") \ 3761 \ 3762 /* Priorities */ \ 3763 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3764 \ 3765 product(intx, ThreadPriorityPolicy, 0, \ 3766 "0 : Normal. "\ 3767 " VM chooses priorities that are appropriate for normal "\ 3768 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3769 " to normal native priority. Java priorities below " \ 3770 " NORM_PRIORITY map to lower native priority values. On "\ 3771 " Windows applications are allowed to use higher native "\ 3772 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3773 " not use the highest possible native priority, "\ 3774 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3775 " system threads. On Linux thread priorities are ignored "\ 3776 " because the OS does not support static priority in "\ 3777 " SCHED_OTHER scheduling class which is the only choice for "\ 3778 " non-root, non-realtime applications. "\ 3779 "1 : Aggressive. "\ 3780 " Java thread priorities map over to the entire range of "\ 3781 " native thread priorities. Higher Java thread priorities map "\ 3782 " to higher native thread priorities. This policy should be "\ 3783 " used with care, as sometimes it can cause performance "\ 3784 " degradation in the application and/or the entire system. On "\ 3785 " Linux this policy requires root privilege.") \ 3786 range(0, 1) \ 3787 \ 3788 product(bool, ThreadPriorityVerbose, false, \ 3789 "Print priority changes") \ 3790 \ 3791 product(intx, CompilerThreadPriority, -1, \ 3792 "The native priority at which compiler threads should run " \ 3793 "(-1 means no change)") \ 3794 range(min_jint, max_jint) \ 3795 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3796 \ 3797 product(intx, VMThreadPriority, -1, \ 3798 "The native priority at which the VM thread should run " \ 3799 "(-1 means no change)") \ 3800 range(-1, 127) \ 3801 \ 3802 product(bool, CompilerThreadHintNoPreempt, true, \ 3803 "(Solaris only) Give compiler threads an extra quanta") \ 3804 \ 3805 product(bool, VMThreadHintNoPreempt, false, \ 3806 "(Solaris only) Give VM thread an extra quanta") \ 3807 \ 3808 product(intx, JavaPriority1_To_OSPriority, -1, \ 3809 "Map Java priorities to OS priorities") \ 3810 range(-1, 127) \ 3811 \ 3812 product(intx, JavaPriority2_To_OSPriority, -1, \ 3813 "Map Java priorities to OS priorities") \ 3814 range(-1, 127) \ 3815 \ 3816 product(intx, JavaPriority3_To_OSPriority, -1, \ 3817 "Map Java priorities to OS priorities") \ 3818 range(-1, 127) \ 3819 \ 3820 product(intx, JavaPriority4_To_OSPriority, -1, \ 3821 "Map Java priorities to OS priorities") \ 3822 range(-1, 127) \ 3823 \ 3824 product(intx, JavaPriority5_To_OSPriority, -1, \ 3825 "Map Java priorities to OS priorities") \ 3826 range(-1, 127) \ 3827 \ 3828 product(intx, JavaPriority6_To_OSPriority, -1, \ 3829 "Map Java priorities to OS priorities") \ 3830 range(-1, 127) \ 3831 \ 3832 product(intx, JavaPriority7_To_OSPriority, -1, \ 3833 "Map Java priorities to OS priorities") \ 3834 range(-1, 127) \ 3835 \ 3836 product(intx, JavaPriority8_To_OSPriority, -1, \ 3837 "Map Java priorities to OS priorities") \ 3838 range(-1, 127) \ 3839 \ 3840 product(intx, JavaPriority9_To_OSPriority, -1, \ 3841 "Map Java priorities to OS priorities") \ 3842 range(-1, 127) \ 3843 \ 3844 product(intx, JavaPriority10_To_OSPriority,-1, \ 3845 "Map Java priorities to OS priorities") \ 3846 range(-1, 127) \ 3847 \ 3848 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3849 "Java thread priority 10 maps to critical scheduling priority") \ 3850 \ 3851 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3852 "Compiler thread(s) run at critical scheduling priority") \ 3853 \ 3854 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3855 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3856 \ 3857 /* compiler debugging */ \ 3858 notproduct(intx, CompileTheWorldStartAt, 1, \ 3859 "First class to consider when using +CompileTheWorld") \ 3860 \ 3861 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3862 "Last class to consider when using +CompileTheWorld") \ 3863 \ 3864 develop(intx, NewCodeParameter, 0, \ 3865 "Testing Only: Create a dedicated integer parameter before " \ 3866 "putback") \ 3867 \ 3868 /* new oopmap storage allocation */ \ 3869 develop(intx, MinOopMapAllocation, 8, \ 3870 "Minimum number of OopMap entries in an OopMapSet") \ 3871 \ 3872 /* Background Compilation */ \ 3873 develop(intx, LongCompileThreshold, 50, \ 3874 "Used with +TraceLongCompiles") \ 3875 \ 3876 /* recompilation */ \ 3877 product_pd(intx, CompileThreshold, \ 3878 "number of interpreted method invocations before (re-)compiling") \ 3879 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3880 \ 3881 product(double, CompileThresholdScaling, 1.0, \ 3882 "Factor to control when first compilation happens " \ 3883 "(both with and without tiered compilation): " \ 3884 "values greater than 1.0 delay counter overflow, " \ 3885 "values between 0 and 1.0 rush counter overflow, " \ 3886 "value of 1.0 leaves compilation thresholds unchanged " \ 3887 "value of 0.0 is equivalent to -Xint. " \ 3888 "" \ 3889 "Flag can be set as per-method option. " \ 3890 "If a value is specified for a method, compilation thresholds " \ 3891 "for that method are scaled by both the value of the global flag "\ 3892 "and the value of the per-method flag.") \ 3893 range(0.0, DBL_MAX) \ 3894 \ 3895 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3896 "Interpreter (tier 0) invocation notification frequency") \ 3897 range(0, 30) \ 3898 \ 3899 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3900 "C1 without MDO (tier 2) invocation notification frequency") \ 3901 range(0, 30) \ 3902 \ 3903 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3904 "C1 with MDO profiling (tier 3) invocation notification " \ 3905 "frequency") \ 3906 range(0, 30) \ 3907 \ 3908 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3909 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3910 range(0, 30) \ 3911 \ 3912 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3913 "Interpreter (tier 0) invocation notification frequency") \ 3914 range(0, 30) \ 3915 \ 3916 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3917 "C1 without MDO (tier 2) invocation notification frequency") \ 3918 range(0, 30) \ 3919 \ 3920 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3921 "C1 with MDO profiling (tier 3) invocation notification " \ 3922 "frequency") \ 3923 range(0, 30) \ 3924 \ 3925 product(intx, Tier2CompileThreshold, 0, \ 3926 "threshold at which tier 2 compilation is invoked") \ 3927 range(0, max_jint) \ 3928 \ 3929 product(intx, Tier2BackEdgeThreshold, 0, \ 3930 "Back edge threshold at which tier 2 compilation is invoked") \ 3931 range(0, max_jint) \ 3932 \ 3933 product(intx, Tier3InvocationThreshold, 200, \ 3934 "Compile if number of method invocations crosses this " \ 3935 "threshold") \ 3936 range(0, max_jint) \ 3937 \ 3938 product(intx, Tier3MinInvocationThreshold, 100, \ 3939 "Minimum invocation to compile at tier 3") \ 3940 range(0, max_jint) \ 3941 \ 3942 product(intx, Tier3CompileThreshold, 2000, \ 3943 "Threshold at which tier 3 compilation is invoked (invocation " \ 3944 "minimum must be satisfied)") \ 3945 range(0, max_jint) \ 3946 \ 3947 product(intx, Tier3BackEdgeThreshold, 60000, \ 3948 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3949 range(0, max_jint) \ 3950 \ 3951 product(intx, Tier4InvocationThreshold, 5000, \ 3952 "Compile if number of method invocations crosses this " \ 3953 "threshold") \ 3954 range(0, max_jint) \ 3955 \ 3956 product(intx, Tier4MinInvocationThreshold, 600, \ 3957 "Minimum invocation to compile at tier 4") \ 3958 range(0, max_jint) \ 3959 \ 3960 product(intx, Tier4CompileThreshold, 15000, \ 3961 "Threshold at which tier 4 compilation is invoked (invocation " \ 3962 "minimum must be satisfied") \ 3963 range(0, max_jint) \ 3964 \ 3965 product(intx, Tier4BackEdgeThreshold, 40000, \ 3966 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3967 range(0, max_jint) \ 3968 \ 3969 product(intx, Tier3DelayOn, 5, \ 3970 "If C2 queue size grows over this amount per compiler thread " \ 3971 "stop compiling at tier 3 and start compiling at tier 2") \ 3972 range(0, max_jint) \ 3973 \ 3974 product(intx, Tier3DelayOff, 2, \ 3975 "If C2 queue size is less than this amount per compiler thread " \ 3976 "allow methods compiled at tier 2 transition to tier 3") \ 3977 range(0, max_jint) \ 3978 \ 3979 product(intx, Tier3LoadFeedback, 5, \ 3980 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3981 "reaches this amount per compiler thread") \ 3982 range(0, max_jint) \ 3983 \ 3984 product(intx, Tier4LoadFeedback, 3, \ 3985 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3986 "reaches this amount per compiler thread") \ 3987 range(0, max_jint) \ 3988 \ 3989 product(intx, TieredCompileTaskTimeout, 50, \ 3990 "Kill compile task if method was not used within " \ 3991 "given timeout in milliseconds") \ 3992 range(0, max_intx) \ 3993 \ 3994 product(intx, TieredStopAtLevel, 4, \ 3995 "Stop at given compilation level") \ 3996 range(0, 4) \ 3997 \ 3998 product(intx, Tier0ProfilingStartPercentage, 200, \ 3999 "Start profiling in interpreter if the counters exceed tier 3 " \ 4000 "thresholds by the specified percentage") \ 4001 range(0, max_jint) \ 4002 \ 4003 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 4004 "Increase the compile threshold for C1 compilation if the code " \ 4005 "cache is filled by the specified percentage") \ 4006 range(0, 99) \ 4007 \ 4008 product(intx, TieredRateUpdateMinTime, 1, \ 4009 "Minimum rate sampling interval (in milliseconds)") \ 4010 range(0, max_intx) \ 4011 \ 4012 product(intx, TieredRateUpdateMaxTime, 25, \ 4013 "Maximum rate sampling interval (in milliseconds)") \ 4014 range(0, max_intx) \ 4015 \ 4016 product_pd(bool, TieredCompilation, \ 4017 "Enable tiered compilation") \ 4018 \ 4019 product(bool, PrintTieredEvents, false, \ 4020 "Print tiered events notifications") \ 4021 \ 4022 product_pd(intx, OnStackReplacePercentage, \ 4023 "NON_TIERED number of method invocations/branches (expressed as " \ 4024 "% of CompileThreshold) before (re-)compiling OSR code") \ 4025 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 4026 \ 4027 product(intx, InterpreterProfilePercentage, 33, \ 4028 "NON_TIERED number of method invocations/branches (expressed as " \ 4029 "% of CompileThreshold) before profiling in the interpreter") \ 4030 range(0, 100) \ 4031 \ 4032 develop(intx, MaxRecompilationSearchLength, 10, \ 4033 "The maximum number of frames to inspect when searching for " \ 4034 "recompilee") \ 4035 \ 4036 develop(intx, MaxInterpretedSearchLength, 3, \ 4037 "The maximum number of interpreted frames to skip when searching "\ 4038 "for recompilee") \ 4039 \ 4040 develop(intx, DesiredMethodLimit, 8000, \ 4041 "The desired maximum method size (in bytecodes) after inlining") \ 4042 \ 4043 develop(intx, HugeMethodLimit, 8000, \ 4044 "Don't compile methods larger than this if " \ 4045 "+DontCompileHugeMethods") \ 4046 \ 4047 /* New JDK 1.4 reflection implementation */ \ 4048 \ 4049 develop(intx, FastSuperclassLimit, 8, \ 4050 "Depth of hardwired instanceof accelerator array") \ 4051 \ 4052 /* Properties for Java libraries */ \ 4053 \ 4054 product(size_t, MaxDirectMemorySize, 0, \ 4055 "Maximum total size of NIO direct-buffer allocations") \ 4056 range(0, (size_t)SIZE_MAX) \ 4057 \ 4058 /* Flags used for temporary code during development */ \ 4059 \ 4060 diagnostic(bool, UseNewCode, false, \ 4061 "Testing Only: Use the new version while testing") \ 4062 \ 4063 diagnostic(bool, UseNewCode2, false, \ 4064 "Testing Only: Use the new version while testing") \ 4065 \ 4066 diagnostic(bool, UseNewCode3, false, \ 4067 "Testing Only: Use the new version while testing") \ 4068 \ 4069 /* flags for performance data collection */ \ 4070 \ 4071 product(bool, UsePerfData, falseInEmbedded, \ 4072 "Flag to disable jvmstat instrumentation for performance testing "\ 4073 "and problem isolation purposes") \ 4074 \ 4075 product(bool, PerfDataSaveToFile, false, \ 4076 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 4077 \ 4078 product(ccstr, PerfDataSaveFile, NULL, \ 4079 "Save PerfData memory to the specified absolute pathname. " \ 4080 "The string %p in the file name (if present) " \ 4081 "will be replaced by pid") \ 4082 \ 4083 product(intx, PerfDataSamplingInterval, 50, \ 4084 "Data sampling interval (in milliseconds)") \ 4085 range(PeriodicTask::min_interval, max_jint) \ 4086 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 4087 \ 4088 develop(bool, PerfTraceDataCreation, false, \ 4089 "Trace creation of Performance Data Entries") \ 4090 \ 4091 develop(bool, PerfTraceMemOps, false, \ 4092 "Trace PerfMemory create/attach/detach calls") \ 4093 \ 4094 product(bool, PerfDisableSharedMem, false, \ 4095 "Store performance data in standard memory") \ 4096 \ 4097 product(intx, PerfDataMemorySize, 64*K, \ 4098 "Size of performance data memory region. Will be rounded " \ 4099 "up to a multiple of the native os page size.") \ 4100 range(128, 32*64*K) \ 4101 \ 4102 product(intx, PerfMaxStringConstLength, 1024, \ 4103 "Maximum PerfStringConstant string length before truncation") \ 4104 range(32, 32*K) \ 4105 \ 4106 product(bool, PerfAllowAtExitRegistration, false, \ 4107 "Allow registration of atexit() methods") \ 4108 \ 4109 product(bool, PerfBypassFileSystemCheck, false, \ 4110 "Bypass Win32 file system criteria checks (Windows Only)") \ 4111 \ 4112 product(intx, UnguardOnExecutionViolation, 0, \ 4113 "Unguard page and retry on no-execute fault (Win32 only) " \ 4114 "0=off, 1=conservative, 2=aggressive") \ 4115 range(0, 2) \ 4116 \ 4117 /* Serviceability Support */ \ 4118 \ 4119 product(bool, ManagementServer, false, \ 4120 "Create JMX Management Server") \ 4121 \ 4122 product(bool, DisableAttachMechanism, false, \ 4123 "Disable mechanism that allows tools to attach to this VM") \ 4124 \ 4125 product(bool, StartAttachListener, false, \ 4126 "Always start Attach Listener at VM startup") \ 4127 \ 4128 manageable(bool, PrintConcurrentLocks, false, \ 4129 "Print java.util.concurrent locks in thread dump") \ 4130 \ 4131 product(bool, TransmitErrorReport, false, \ 4132 "Enable error report transmission on erroneous termination") \ 4133 \ 4134 product(ccstr, ErrorReportServer, NULL, \ 4135 "Override built-in error report server address") \ 4136 \ 4137 /* Shared spaces */ \ 4138 \ 4139 product(bool, UseSharedSpaces, true, \ 4140 "Use shared spaces for metadata") \ 4141 \ 4142 product(bool, VerifySharedSpaces, false, \ 4143 "Verify shared spaces (false for default archive, true for " \ 4144 "archive specified by -XX:SharedArchiveFile)") \ 4145 \ 4146 product(bool, RequireSharedSpaces, false, \ 4147 "Require shared spaces for metadata") \ 4148 \ 4149 product(bool, DumpSharedSpaces, false, \ 4150 "Special mode: JVM reads a class list, loads classes, builds " \ 4151 "shared spaces, and dumps the shared spaces to a file to be " \ 4152 "used in future JVM runs") \ 4153 \ 4154 product(bool, PrintSharedSpaces, false, \ 4155 "Print usage of shared spaces") \ 4156 \ 4157 product(bool, PrintSharedArchiveAndExit, false, \ 4158 "Print shared archive file contents") \ 4159 \ 4160 product(bool, PrintSharedDictionary, false, \ 4161 "If PrintSharedArchiveAndExit is true, also print the shared " \ 4162 "dictionary") \ 4163 \ 4164 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \ 4165 "Size of read-write space for metadata (in bytes)") \ 4166 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \ 4167 \ 4168 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \ 4169 "Size of read-only space for metadata (in bytes)") \ 4170 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \ 4171 \ 4172 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \ 4173 "Size of the shared miscellaneous data area (in bytes)") \ 4174 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \ 4175 \ 4176 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \ 4177 "Size of the shared miscellaneous code area (in bytes)") \ 4178 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \ 4179 \ 4180 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 4181 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 4182 "Address to allocate shared memory region for class data") \ 4183 range(0, SIZE_MAX) \ 4184 \ 4185 product(uintx, SharedSymbolTableBucketSize, 4, \ 4186 "Average number of symbols per bucket in shared table") \ 4187 range(2, 246) \ 4188 \ 4189 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 4190 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 4191 "classes. Just exclude them from the shared dictionary.") \ 4192 \ 4193 diagnostic(bool, PrintMethodHandleStubs, false, \ 4194 "Print generated stub code for method handles") \ 4195 \ 4196 develop(bool, TraceMethodHandles, false, \ 4197 "trace internal method handle operations") \ 4198 \ 4199 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4200 "perform extra checks when constructing method handles") \ 4201 \ 4202 diagnostic(bool, ShowHiddenFrames, false, \ 4203 "show method handle implementation frames (usually hidden)") \ 4204 \ 4205 experimental(bool, TrustFinalNonStaticFields, false, \ 4206 "trust final non-static declarations for constant folding") \ 4207 \ 4208 diagnostic(bool, FoldStableValues, true, \ 4209 "Optimize loads from stable fields (marked w/ @Stable)") \ 4210 \ 4211 develop(bool, TraceInvokeDynamic, false, \ 4212 "trace internal invoke dynamic operations") \ 4213 \ 4214 diagnostic(bool, PauseAtStartup, false, \ 4215 "Causes the VM to pause at startup time and wait for the pause " \ 4216 "file to be removed (default: ./vm.paused.<pid>)") \ 4217 \ 4218 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4219 "The file to create and for whose removal to await when pausing " \ 4220 "at startup. (default: ./vm.paused.<pid>)") \ 4221 \ 4222 diagnostic(bool, PauseAtExit, false, \ 4223 "Pause and wait for keypress on exit if a debugger is attached") \ 4224 \ 4225 product(bool, ExtendedDTraceProbes, false, \ 4226 "Enable performance-impacting dtrace probes") \ 4227 \ 4228 product(bool, DTraceMethodProbes, false, \ 4229 "Enable dtrace probes for method-entry and method-exit") \ 4230 \ 4231 product(bool, DTraceAllocProbes, false, \ 4232 "Enable dtrace probes for object allocation") \ 4233 \ 4234 product(bool, DTraceMonitorProbes, false, \ 4235 "Enable dtrace probes for monitor events") \ 4236 \ 4237 product(bool, RelaxAccessControlCheck, false, \ 4238 "Relax the access control checks in the verifier") \ 4239 \ 4240 product(uintx, StringTableSize, defaultStringTableSize, \ 4241 "Number of buckets in the interned String table") \ 4242 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4243 \ 4244 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4245 "Number of buckets in the JVM internal Symbol table") \ 4246 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4247 \ 4248 product(bool, UseStringDeduplication, false, \ 4249 "Use string deduplication") \ 4250 \ 4251 product(bool, PrintStringDeduplicationStatistics, false, \ 4252 "Print string deduplication statistics") \ 4253 \ 4254 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4255 "A string must reach this age (or be promoted to an old region) " \ 4256 "to be considered for deduplication") \ 4257 range(1, markOopDesc::max_age) \ 4258 \ 4259 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4260 "Force table resize every time the table is scanned") \ 4261 \ 4262 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4263 "Force table rehash every time the table is scanned") \ 4264 \ 4265 diagnostic(bool, WhiteBoxAPI, false, \ 4266 "Enable internal testing APIs") \ 4267 \ 4268 product(bool, PrintGCCause, true, \ 4269 "Include GC cause in GC logging") \ 4270 \ 4271 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4272 "Default survivor space alignment in bytes") \ 4273 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4274 \ 4275 product(bool , AllowNonVirtualCalls, false, \ 4276 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4277 \ 4278 product(ccstr, DumpLoadedClassList, NULL, \ 4279 "Dump the names all loaded classes, that could be stored into " \ 4280 "the CDS archive, in the specified file") \ 4281 \ 4282 product(ccstr, SharedClassListFile, NULL, \ 4283 "Override the default CDS class list") \ 4284 \ 4285 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4286 "Override the default location of the CDS archive file") \ 4287 \ 4288 product(ccstr, ExtraSharedClassListFile, NULL, \ 4289 "Extra classlist for building the CDS archive file") \ 4290 \ 4291 experimental(size_t, ArrayAllocatorMallocLimit, \ 4292 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4293 "Allocation less than this value will be allocated " \ 4294 "using malloc. Larger allocations will use mmap.") \ 4295 \ 4296 experimental(bool, AlwaysAtomicAccesses, false, \ 4297 "Accesses to all variables should always be atomic") \ 4298 \ 4299 product(bool, EnableTracing, false, \ 4300 "Enable event-based tracing") \ 4301 \ 4302 product(bool, UseLockedTracing, false, \ 4303 "Use locked-tracing when doing event-based tracing") \ 4304 \ 4305 diagnostic(bool, UseUnalignedAccesses, false, \ 4306 "Use unaligned memory accesses in Unsafe") \ 4307 \ 4308 product_pd(bool, PreserveFramePointer, \ 4309 "Use the FP register for holding the frame pointer " \ 4310 "and not as a general purpose register.") \ 4311 \ 4312 diagnostic(bool, CheckIntrinsics, true, \ 4313 "When a class C is loaded, check that " \ 4314 "(1) all intrinsics defined by the VM for class C are present "\ 4315 "in the loaded class file and are marked with the " \ 4316 "@HotSpotIntrinsicCandidate annotation, that " \ 4317 "(2) there is an intrinsic registered for all loaded methods " \ 4318 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4319 "annotation, and that " \ 4320 "(3) no orphan methods exist for class C (i.e., methods for " \ 4321 "which the VM declares an intrinsic but that are not declared "\ 4322 "in the loaded class C. " \ 4323 "Check (3) is available only in debug builds.") \ 4324 \ 4325 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4326 "Disable backwards compatibility for compile commands.") \ 4327 \ 4328 diagnostic(bool, PrintCompilerDirectives, false, \ 4329 "Print compiler directives on installation.") 4330 4331/* 4332 * Macros for factoring of globals 4333 */ 4334 4335// Interface macros 4336#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4337#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4338#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4339#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4340#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4341#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4342#ifdef PRODUCT 4343#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4344#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4345#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4346#else 4347#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4348#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4349#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4350#endif // PRODUCT 4351// Special LP64 flags, product only needed for now. 4352#ifdef _LP64 4353#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4354#else 4355#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4356#endif // _LP64 4357 4358// Implementation macros 4359#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4360#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4361#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4362#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4363#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4364#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4365#ifdef PRODUCT 4366#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4367#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4368#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4369#else 4370#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4371#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4372#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4373#endif // PRODUCT 4374#ifdef _LP64 4375#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4376#else 4377#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4378#endif // _LP64 4379 4380// Only materialize src code for range checking when required, ignore otherwise 4381#define IGNORE_RANGE(a, b) 4382// Only materialize src code for contraint checking when required, ignore otherwise 4383#define IGNORE_CONSTRAINT(func,type) 4384 4385RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4386 DECLARE_PD_DEVELOPER_FLAG, \ 4387 DECLARE_PRODUCT_FLAG, \ 4388 DECLARE_PD_PRODUCT_FLAG, \ 4389 DECLARE_DIAGNOSTIC_FLAG, \ 4390 DECLARE_EXPERIMENTAL_FLAG, \ 4391 DECLARE_NOTPRODUCT_FLAG, \ 4392 DECLARE_MANAGEABLE_FLAG, \ 4393 DECLARE_PRODUCT_RW_FLAG, \ 4394 DECLARE_LP64_PRODUCT_FLAG, \ 4395 IGNORE_RANGE, \ 4396 IGNORE_CONSTRAINT) 4397 4398RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4399 DECLARE_PD_DEVELOPER_FLAG, \ 4400 DECLARE_PRODUCT_FLAG, \ 4401 DECLARE_PD_PRODUCT_FLAG, \ 4402 DECLARE_DIAGNOSTIC_FLAG, \ 4403 DECLARE_NOTPRODUCT_FLAG, \ 4404 IGNORE_RANGE, \ 4405 IGNORE_CONSTRAINT) 4406 4407ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4408 DECLARE_PRODUCT_FLAG, \ 4409 DECLARE_DIAGNOSTIC_FLAG, \ 4410 DECLARE_EXPERIMENTAL_FLAG, \ 4411 DECLARE_NOTPRODUCT_FLAG, \ 4412 IGNORE_RANGE, \ 4413 IGNORE_CONSTRAINT) 4414 4415// Extensions 4416 4417#include "runtime/globals_ext.hpp" 4418 4419#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4420