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 <float.h> 29 #include "utilities/debug.hpp" 30 #include <float.h> // for DBL_MAX 31 32 // use this for flags that are true per default in the tiered build 33 // but false in non-tiered builds, and vice versa 34 #ifdef TIERED 35 #define trueInTiered true 36 #define falseInTiered false 37 #else 38 #define trueInTiered false 39 #define falseInTiered true 40 #endif 41 42 #ifdef TARGET_ARCH_x86 43 # include "globals_x86.hpp" 44 #endif 45 #ifdef TARGET_ARCH_sparc 46 # include "globals_sparc.hpp" 47 #endif 48 #ifdef TARGET_ARCH_zero 49 # include "globals_zero.hpp" 50 #endif 51 #ifdef TARGET_ARCH_arm 52 # include "globals_arm.hpp" 53 #endif 54 #ifdef TARGET_ARCH_ppc 55 # include "globals_ppc.hpp" 56 #endif 57 #ifdef TARGET_ARCH_aarch64 58 # include "globals_aarch64.hpp" 59 #endif 60 #ifdef TARGET_OS_FAMILY_linux 61 # include "globals_linux.hpp" 62 #endif 63 #ifdef TARGET_OS_FAMILY_solaris 64 # include "globals_solaris.hpp" 65 #endif 66 #ifdef TARGET_OS_FAMILY_windows 67 # include "globals_windows.hpp" 68 #endif 69 #ifdef TARGET_OS_FAMILY_aix 70 # include "globals_aix.hpp" 71 #endif 72 #ifdef TARGET_OS_FAMILY_bsd 73 # include "globals_bsd.hpp" 74 #endif 75 #ifdef TARGET_OS_ARCH_linux_x86 76 # include "globals_linux_x86.hpp" 77 #endif 78 #ifdef TARGET_OS_ARCH_linux_sparc 79 # include "globals_linux_sparc.hpp" 80 #endif 81 #ifdef TARGET_OS_ARCH_linux_zero 82 # include "globals_linux_zero.hpp" 83 #endif 84 #ifdef TARGET_OS_ARCH_solaris_x86 85 # include "globals_solaris_x86.hpp" 86 #endif 87 #ifdef TARGET_OS_ARCH_solaris_sparc 88 # include "globals_solaris_sparc.hpp" 89 #endif 90 #ifdef TARGET_OS_ARCH_windows_x86 91 # include "globals_windows_x86.hpp" 92 #endif 93 #ifdef TARGET_OS_ARCH_linux_arm 94 # include "globals_linux_arm.hpp" 95 #endif 96 #ifdef TARGET_OS_ARCH_linux_ppc 97 # include "globals_linux_ppc.hpp" 98 #endif 99 #ifdef TARGET_OS_ARCH_linux_aarch64 100 # include "globals_linux_aarch64.hpp" 101 #endif 102 #ifdef TARGET_OS_ARCH_aix_ppc 103 # include "globals_aix_ppc.hpp" 104 #endif 105 #ifdef TARGET_OS_ARCH_bsd_x86 106 # include "globals_bsd_x86.hpp" 107 #endif 108 #ifdef TARGET_OS_ARCH_bsd_zero 109 # include "globals_bsd_zero.hpp" 110 #endif 111 #ifdef COMPILER1 112 #ifdef TARGET_ARCH_x86 113 # include "c1_globals_x86.hpp" 114 #endif 115 #ifdef TARGET_ARCH_sparc 116 # include "c1_globals_sparc.hpp" 117 #endif 118 #ifdef TARGET_ARCH_arm 119 # include "c1_globals_arm.hpp" 120 #endif 121 #ifdef TARGET_ARCH_aarch64 122 # include "c1_globals_aarch64.hpp" 123 #endif 124 #ifdef TARGET_OS_FAMILY_linux 125 # include "c1_globals_linux.hpp" 126 #endif 127 #ifdef TARGET_OS_FAMILY_solaris 128 # include "c1_globals_solaris.hpp" 129 #endif 130 #ifdef TARGET_OS_FAMILY_windows 131 # include "c1_globals_windows.hpp" 132 #endif 133 #ifdef TARGET_OS_FAMILY_aix 134 # include "c1_globals_aix.hpp" 135 #endif 136 #ifdef TARGET_OS_FAMILY_bsd 137 # include "c1_globals_bsd.hpp" 138 #endif 139 #ifdef TARGET_ARCH_ppc 140 # include "c1_globals_ppc.hpp" 141 #endif 142 #endif 143 #ifdef COMPILER2 144 #ifdef TARGET_ARCH_x86 145 # include "c2_globals_x86.hpp" 146 #endif 147 #ifdef TARGET_ARCH_sparc 148 # include "c2_globals_sparc.hpp" 149 #endif 150 #ifdef TARGET_ARCH_arm 151 # include "c2_globals_arm.hpp" 152 #endif 153 #ifdef TARGET_ARCH_ppc 154 # include "c2_globals_ppc.hpp" 155 #endif 156 #ifdef TARGET_ARCH_aarch64 157 # include "c2_globals_aarch64.hpp" 158 #endif 159 #ifdef TARGET_OS_FAMILY_linux 160 # include "c2_globals_linux.hpp" 161 #endif 162 #ifdef TARGET_OS_FAMILY_solaris 163 # include "c2_globals_solaris.hpp" 164 #endif 165 #ifdef TARGET_OS_FAMILY_windows 166 # include "c2_globals_windows.hpp" 167 #endif 168 #ifdef TARGET_OS_FAMILY_aix 169 # include "c2_globals_aix.hpp" 170 #endif 171 #ifdef TARGET_OS_FAMILY_bsd 172 # include "c2_globals_bsd.hpp" 173 #endif 174 #endif 175 #ifdef SHARK 176 #ifdef TARGET_ARCH_zero 177 # include "shark_globals_zero.hpp" 178 #endif 179 #endif 180 181 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI 182 define_pd_global(bool, BackgroundCompilation, false); 183 define_pd_global(bool, UseTLAB, false); 184 define_pd_global(bool, CICompileOSR, false); 185 define_pd_global(bool, UseTypeProfile, false); 186 define_pd_global(bool, UseOnStackReplacement, false); 187 define_pd_global(bool, InlineIntrinsics, false); 188 define_pd_global(bool, PreferInterpreterNativeStubs, true); 189 define_pd_global(bool, ProfileInterpreter, false); 190 define_pd_global(bool, ProfileTraps, false); 191 define_pd_global(bool, TieredCompilation, false); 192 193 define_pd_global(intx, CompileThreshold, 0); 194 195 define_pd_global(intx, OnStackReplacePercentage, 0); 196 define_pd_global(bool, ResizeTLAB, false); 197 define_pd_global(intx, FreqInlineSize, 0); 198 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 199 define_pd_global(intx, InlineClassNatives, true); 200 define_pd_global(intx, InlineUnsafeOps, true); 201 define_pd_global(intx, InitialCodeCacheSize, 160*K); 202 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 203 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 204 define_pd_global(intx, ProfiledCodeHeapSize, 0); 205 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 206 207 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 208 define_pd_global(intx, CodeCacheMinBlockLength, 1); 209 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 210 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 211 define_pd_global(bool, NeverActAsServerClassMachine, true); 212 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 213 #define CI_COMPILER_COUNT 0 214 #else 215 216 #if defined(COMPILER2) || INCLUDE_JVMCI 217 #define CI_COMPILER_COUNT 2 218 #else 219 #define CI_COMPILER_COUNT 1 220 #endif // COMPILER2 || INCLUDE_JVMCI 221 222 #endif // no compilers 223 224 // string type aliases used only in this file 225 typedef const char* ccstr; 226 typedef const char* ccstrlist; // represents string arguments which accumulate 227 228 struct Flag { 229 enum Flags { 230 // value origin 231 DEFAULT = 0, 232 COMMAND_LINE = 1, 233 ENVIRON_VAR = 2, 234 CONFIG_FILE = 3, 235 MANAGEMENT = 4, 236 ERGONOMIC = 5, 237 ATTACH_ON_DEMAND = 6, 238 INTERNAL = 7, 239 240 LAST_VALUE_ORIGIN = INTERNAL, 241 VALUE_ORIGIN_BITS = 4, 242 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 243 244 // flag kind 245 KIND_PRODUCT = 1 << 4, 246 KIND_MANAGEABLE = 1 << 5, 247 KIND_DIAGNOSTIC = 1 << 6, 248 KIND_EXPERIMENTAL = 1 << 7, 249 KIND_NOT_PRODUCT = 1 << 8, 250 KIND_DEVELOP = 1 << 9, 251 KIND_PLATFORM_DEPENDENT = 1 << 10, 252 KIND_READ_WRITE = 1 << 11, 253 KIND_C1 = 1 << 12, 254 KIND_C2 = 1 << 13, 255 KIND_ARCH = 1 << 14, 256 KIND_SHARK = 1 << 15, 257 KIND_LP64_PRODUCT = 1 << 16, 258 KIND_COMMERCIAL = 1 << 17, 259 KIND_JVMCI = 1 << 18, 260 261 KIND_MASK = ~VALUE_ORIGIN_MASK 262 }; 263 264 enum Error { 265 // no error 266 SUCCESS = 0, 267 // flag name is missing 268 MISSING_NAME, 269 // flag value is missing 270 MISSING_VALUE, 271 // error parsing the textual form of the value 272 WRONG_FORMAT, 273 // flag is not writeable 274 NON_WRITABLE, 275 // flag value is outside of its bounds 276 OUT_OF_BOUNDS, 277 // flag value violates its constraint 278 VIOLATES_CONSTRAINT, 279 // there is no flag with the given name 280 INVALID_FLAG, 281 // other, unspecified error related to setting the flag 282 ERR_OTHER 283 }; 284 285 enum MsgType { 286 NONE = 0, 287 DIAGNOSTIC_FLAG_BUT_LOCKED, 288 EXPERIMENTAL_FLAG_BUT_LOCKED, 289 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 290 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 291 }; 292 293 const char* _type; 294 const char* _name; 295 void* _addr; 296 NOT_PRODUCT(const char* _doc;) 297 Flags _flags; 298 299 // points to all Flags static array 300 static Flag* flags; 301 302 // number of flags 303 static size_t numFlags; 304 305 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 306 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 307 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 308 309 void check_writable(); 310 311 bool is_bool() const; 312 bool get_bool() const; 313 void set_bool(bool value); 314 315 bool is_int() const; 316 int get_int() const; 317 void set_int(int value); 318 319 bool is_uint() const; 320 uint get_uint() const; 321 void set_uint(uint value); 322 323 bool is_intx() const; 324 intx get_intx() const; 325 void set_intx(intx value); 326 327 bool is_uintx() const; 328 uintx get_uintx() const; 329 void set_uintx(uintx value); 330 331 bool is_uint64_t() const; 332 uint64_t get_uint64_t() const; 333 void set_uint64_t(uint64_t value); 334 335 bool is_size_t() const; 336 size_t get_size_t() const; 337 void set_size_t(size_t value); 338 339 bool is_double() const; 340 double get_double() const; 341 void set_double(double value); 342 343 bool is_ccstr() const; 344 bool ccstr_accumulates() const; 345 ccstr get_ccstr() const; 346 void set_ccstr(ccstr value); 347 348 Flags get_origin(); 349 void set_origin(Flags origin); 350 351 bool is_default(); 352 bool is_ergonomic(); 353 bool is_command_line(); 354 355 bool is_product() const; 356 bool is_manageable() const; 357 bool is_diagnostic() const; 358 bool is_experimental() const; 359 bool is_notproduct() const; 360 bool is_develop() const; 361 bool is_read_write() const; 362 bool is_commercial() const; 363 364 bool is_constant_in_binary() const; 365 366 bool is_unlocker() const; 367 bool is_unlocked() const; 368 bool is_writeable() const; 369 bool is_external() const; 370 371 bool is_unlocker_ext() const; 372 bool is_unlocked_ext() const; 373 bool is_writeable_ext() const; 374 bool is_external_ext() const; 375 376 void unlock_diagnostic(); 377 378 Flag::MsgType get_locked_message(char*, int) const; 379 void get_locked_message_ext(char*, int) const; 380 381 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 382 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 383 void print_kind(outputStream* st); 384 void print_as_flag(outputStream* st); 385 386 static const char* flag_error_str(Flag::Error error); 387 }; 388 389 // debug flags control various aspects of the VM and are global accessible 390 391 // use FlagSetting to temporarily change some debug flag 392 // e.g. FlagSetting fs(DebugThisAndThat, true); 393 // restored to previous value upon leaving scope 394 class FlagSetting { 395 bool val; 396 bool* flag; 397 public: 398 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 399 ~FlagSetting() { *flag = val; } 400 }; 401 402 403 class CounterSetting { 404 intx* counter; 405 public: 406 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 407 ~CounterSetting() { (*counter)--; } 408 }; 409 410 class IntFlagSetting { 411 int val; 412 int* flag; 413 public: 414 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 415 ~IntFlagSetting() { *flag = val; } 416 }; 417 418 class UIntFlagSetting { 419 uint val; 420 uint* flag; 421 public: 422 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 423 ~UIntFlagSetting() { *flag = val; } 424 }; 425 426 class UIntXFlagSetting { 427 uintx val; 428 uintx* flag; 429 public: 430 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 431 ~UIntXFlagSetting() { *flag = val; } 432 }; 433 434 class DoubleFlagSetting { 435 double val; 436 double* flag; 437 public: 438 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 439 ~DoubleFlagSetting() { *flag = val; } 440 }; 441 442 class SizeTFlagSetting { 443 size_t val; 444 size_t* flag; 445 public: 446 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 447 ~SizeTFlagSetting() { *flag = val; } 448 }; 449 450 451 class CommandLineFlags { 452 public: 453 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 454 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 455 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 456 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 457 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 458 459 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 460 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); } 461 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 462 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 463 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 464 465 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 466 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 467 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 468 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 469 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 470 471 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 472 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); } 473 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 474 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 475 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 476 477 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 478 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); } 479 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 480 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 481 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 482 483 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 484 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); } 485 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 486 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 487 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 488 489 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 490 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); } 491 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 492 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 493 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 494 495 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 496 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); } 497 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 498 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 499 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 500 501 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 502 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); } 503 // Contract: Flag will make private copy of the incoming value. 504 // Outgoing value is always malloc-ed, and caller MUST call free. 505 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 506 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 507 508 // Returns false if name is not a command line flag. 509 static bool wasSetOnCmdline(const char* name, bool* value); 510 static void printSetFlags(outputStream* out); 511 512 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 513 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 514 515 static void verify() PRODUCT_RETURN; 516 }; 517 518 // use this for flags that are true by default in the debug version but 519 // false in the optimized version, and vice versa 520 #ifdef ASSERT 521 #define trueInDebug true 522 #define falseInDebug false 523 #else 524 #define trueInDebug false 525 #define falseInDebug true 526 #endif 527 528 // use this for flags that are true per default in the product build 529 // but false in development builds, and vice versa 530 #ifdef PRODUCT 531 #define trueInProduct true 532 #define falseInProduct false 533 #else 534 #define trueInProduct false 535 #define falseInProduct true 536 #endif 537 538 #ifdef JAVASE_EMBEDDED 539 #define falseInEmbedded false 540 #else 541 #define falseInEmbedded true 542 #endif 543 544 // develop flags are settable / visible only during development and are constant in the PRODUCT version 545 // product flags are always settable / visible 546 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 547 548 // A flag must be declared with one of the following types: 549 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 550 // The type "ccstr" is an alias for "const char*" and is used 551 // only in this file, because the macrology requires single-token type names. 552 553 // Note: Diagnostic options not meant for VM tuning or for product modes. 554 // They are to be used for VM quality assurance or field diagnosis 555 // of VM bugs. They are hidden so that users will not be encouraged to 556 // try them as if they were VM ordinary execution options. However, they 557 // are available in the product version of the VM. Under instruction 558 // from support engineers, VM customers can turn them on to collect 559 // diagnostic information about VM problems. To use a VM diagnostic 560 // option, you must first specify +UnlockDiagnosticVMOptions. 561 // (This master switch also affects the behavior of -Xprintflags.) 562 // 563 // experimental flags are in support of features that are not 564 // part of the officially supported product, but are available 565 // for experimenting with. They could, for example, be performance 566 // features that may not have undergone full or rigorous QA, but which may 567 // help performance in some cases and released for experimentation 568 // by the community of users and developers. This flag also allows one to 569 // be able to build a fully supported product that nonetheless also 570 // ships with some unsupported, lightly tested, experimental features. 571 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 572 // UnlockExperimentalVMOptions flag, which allows the control and 573 // modification of the experimental flags. 574 // 575 // Nota bene: neither diagnostic nor experimental options should be used casually, 576 // and they are not supported on production loads, except under explicit 577 // direction from support engineers. 578 // 579 // manageable flags are writeable external product flags. 580 // They are dynamically writeable through the JDK management interface 581 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 582 // These flags are external exported interface (see CCC). The list of 583 // manageable flags can be queried programmatically through the management 584 // interface. 585 // 586 // A flag can be made as "manageable" only if 587 // - the flag is defined in a CCC as an external exported interface. 588 // - the VM implementation supports dynamic setting of the flag. 589 // This implies that the VM must *always* query the flag variable 590 // and not reuse state related to the flag state at any given time. 591 // - you want the flag to be queried programmatically by the customers. 592 // 593 // product_rw flags are writeable internal product flags. 594 // They are like "manageable" flags but for internal/private use. 595 // The list of product_rw flags are internal/private flags which 596 // may be changed/removed in a future release. It can be set 597 // through the management interface to get/set value 598 // when the name of flag is supplied. 599 // 600 // A flag can be made as "product_rw" only if 601 // - the VM implementation supports dynamic setting of the flag. 602 // This implies that the VM must *always* query the flag variable 603 // and not reuse state related to the flag state at any given time. 604 // 605 // Note that when there is a need to support develop flags to be writeable, 606 // it can be done in the same way as product_rw. 607 // 608 // range is a macro that will expand to min and max arguments for range 609 // checking code if provided - see commandLineFlagRangeList.hpp 610 // 611 // constraint is a macro that will expand to custom function call 612 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 613 // 614 615 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 616 \ 617 lp64_product(bool, UseCompressedOops, false, \ 618 "Use 32-bit object references in 64-bit VM. " \ 619 "lp64_product means flag is always constant in 32 bit VM") \ 620 \ 621 lp64_product(bool, UseCompressedClassPointers, false, \ 622 "Use 32-bit class pointers in 64-bit VM. " \ 623 "lp64_product means flag is always constant in 32 bit VM") \ 624 \ 625 notproduct(bool, CheckCompressedOops, true, \ 626 "Generate checks in encoding/decoding code in debug VM") \ 627 \ 628 product_pd(size_t, HeapBaseMinAddress, \ 629 "OS specific low limit for heap base address") \ 630 \ 631 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 632 "Heap allocation steps through preferred address regions to find" \ 633 " where it can allocate the heap. Number of steps to take per " \ 634 "region.") \ 635 range(1, max_uintx) \ 636 \ 637 diagnostic(bool, PrintCompressedOopsMode, false, \ 638 "Print compressed oops base address and encoding mode") \ 639 \ 640 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 641 "Default object alignment in bytes, 8 is minimum") \ 642 range(8, 256) \ 643 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 644 \ 645 product(bool, AssumeMP, false, \ 646 "Instruct the VM to assume multiple processors are available") \ 647 \ 648 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 649 /* removal testing. It was supposed to be removed before FCS but has */ \ 650 /* been re-added (see 6401008) */ \ 651 product_pd(bool, UseMembar, \ 652 "(Unstable) Issues membars on thread state transitions") \ 653 \ 654 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 655 "Clean the chunk pool asynchronously") \ 656 \ 657 experimental(bool, AlwaysSafeConstructors, false, \ 658 "Force safe construction, as if all fields are final.") \ 659 \ 660 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 661 "Enable normal processing of flags relating to field diagnostics")\ 662 \ 663 experimental(bool, UnlockExperimentalVMOptions, false, \ 664 "Enable normal processing of flags relating to experimental " \ 665 "features") \ 666 \ 667 product(bool, JavaMonitorsInStackTrace, true, \ 668 "Print information about Java monitor locks when the stacks are" \ 669 "dumped") \ 670 \ 671 product_pd(bool, UseLargePages, \ 672 "Use large page memory") \ 673 \ 674 product_pd(bool, UseLargePagesIndividualAllocation, \ 675 "Allocate large pages individually for better affinity") \ 676 \ 677 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 678 "Fail large pages individual allocation") \ 679 \ 680 product(bool, UseLargePagesInMetaspace, false, \ 681 "Use large page memory in metaspace. " \ 682 "Only used if UseLargePages is enabled.") \ 683 \ 684 develop(bool, TracePageSizes, false, \ 685 "Trace page size selection and usage") \ 686 \ 687 product(bool, UseNUMA, false, \ 688 "Use NUMA if available") \ 689 \ 690 product(bool, UseNUMAInterleaving, false, \ 691 "Interleave memory across NUMA nodes if available") \ 692 \ 693 product(size_t, NUMAInterleaveGranularity, 2*M, \ 694 "Granularity to use for NUMA interleaving on Windows OS") \ 695 \ 696 product(bool, ForceNUMA, false, \ 697 "Force NUMA optimizations on single-node/UMA systems") \ 698 \ 699 product(uintx, NUMAChunkResizeWeight, 20, \ 700 "Percentage (0-100) used to weight the current sample when " \ 701 "computing exponentially decaying average for " \ 702 "AdaptiveNUMAChunkSizing") \ 703 range(0, 100) \ 704 \ 705 product(size_t, NUMASpaceResizeRate, 1*G, \ 706 "Do not reallocate more than this amount per collection") \ 707 \ 708 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 709 "Enable adaptive chunk sizing for NUMA") \ 710 \ 711 product(bool, NUMAStats, false, \ 712 "Print NUMA stats in detailed heap information") \ 713 \ 714 product(uintx, NUMAPageScanRate, 256, \ 715 "Maximum number of pages to include in the page scan procedure") \ 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 \ 737 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 738 "Use large pages if maximum heap is at least this big") \ 739 \ 740 product(bool, ForceTimeHighResolution, false, \ 741 "Using high time resolution (for Win32 only)") \ 742 \ 743 develop(bool, TraceItables, false, \ 744 "Trace initialization and use of itables") \ 745 \ 746 develop(bool, TracePcPatching, false, \ 747 "Trace usage of frame::patch_pc") \ 748 \ 749 develop(bool, TraceJumps, false, \ 750 "Trace assembly jumps in thread ring buffer") \ 751 \ 752 develop(bool, TraceRelocator, false, \ 753 "Trace the bytecode relocator") \ 754 \ 755 develop(bool, TraceLongCompiles, false, \ 756 "Print out every time compilation is longer than " \ 757 "a given threshold") \ 758 \ 759 develop(bool, SafepointALot, false, \ 760 "Generate a lot of safepoints. This works with " \ 761 "GuaranteedSafepointInterval") \ 762 \ 763 product_pd(bool, BackgroundCompilation, \ 764 "A thread requesting compilation is not blocked during " \ 765 "compilation") \ 766 \ 767 product(bool, PrintVMQWaitTime, false, \ 768 "Print out the waiting time in VM operation queue") \ 769 \ 770 develop(bool, TraceOopMapGeneration, false, \ 771 "Show OopMapGeneration") \ 772 \ 773 product(bool, MethodFlushing, true, \ 774 "Reclamation of zombie and not-entrant methods") \ 775 \ 776 develop(bool, VerifyStack, false, \ 777 "Verify stack of each thread when it is entering a runtime call") \ 778 \ 779 diagnostic(bool, ForceUnreachable, false, \ 780 "Make all non code cache addresses to be unreachable by " \ 781 "forcing use of 64bit literal fixups") \ 782 \ 783 notproduct(bool, StressDerivedPointers, false, \ 784 "Force scavenge when a derived pointer is detected on stack " \ 785 "after rtm call") \ 786 \ 787 develop(bool, TraceDerivedPointers, false, \ 788 "Trace traversal of derived pointers on stack") \ 789 \ 790 notproduct(bool, TraceCodeBlobStacks, false, \ 791 "Trace stack-walk of codeblobs") \ 792 \ 793 product(bool, PrintJNIResolving, false, \ 794 "Used to implement -v:jni") \ 795 \ 796 notproduct(bool, PrintRewrites, false, \ 797 "Print methods that are being rewritten") \ 798 \ 799 product(bool, UseInlineCaches, true, \ 800 "Use Inline Caches for virtual calls ") \ 801 \ 802 develop(bool, InlineArrayCopy, true, \ 803 "Inline arraycopy native that is known to be part of " \ 804 "base library DLL") \ 805 \ 806 develop(bool, InlineObjectHash, true, \ 807 "Inline Object::hashCode() native that is known to be part " \ 808 "of base library DLL") \ 809 \ 810 develop(bool, InlineNatives, true, \ 811 "Inline natives that are known to be part of base library DLL") \ 812 \ 813 develop(bool, InlineMathNatives, true, \ 814 "Inline SinD, CosD, etc.") \ 815 \ 816 develop(bool, InlineClassNatives, true, \ 817 "Inline Class.isInstance, etc") \ 818 \ 819 develop(bool, InlineThreadNatives, true, \ 820 "Inline Thread.currentThread, etc") \ 821 \ 822 develop(bool, InlineUnsafeOps, true, \ 823 "Inline memory ops (native methods) from Unsafe") \ 824 \ 825 product(bool, CriticalJNINatives, true, \ 826 "Check for critical JNI entry points") \ 827 \ 828 notproduct(bool, StressCriticalJNINatives, false, \ 829 "Exercise register saving code in critical natives") \ 830 \ 831 product(bool, UseSSE42Intrinsics, false, \ 832 "SSE4.2 versions of intrinsics") \ 833 \ 834 product(bool, UseAESIntrinsics, false, \ 835 "Use intrinsics for AES versions of crypto") \ 836 \ 837 product(bool, UseSHA1Intrinsics, false, \ 838 "Use intrinsics for SHA-1 crypto hash function. " \ 839 "Requires that UseSHA is enabled.") \ 840 \ 841 product(bool, UseSHA256Intrinsics, false, \ 842 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 843 "Requires that UseSHA is enabled.") \ 844 \ 845 product(bool, UseSHA512Intrinsics, false, \ 846 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 847 "Requires that UseSHA is enabled.") \ 848 \ 849 product(bool, UseCRC32Intrinsics, false, \ 850 "use intrinsics for java.util.zip.CRC32") \ 851 \ 852 product(bool, UseCRC32CIntrinsics, false, \ 853 "use intrinsics for java.util.zip.CRC32C") \ 854 \ 855 product(bool, UseAdler32Intrinsics, false, \ 856 "use intrinsics for java.util.zip.Adler32") \ 857 \ 858 diagnostic(ccstrlist, DisableIntrinsic, "", \ 859 "do not expand intrinsics whose (internal) names appear here") \ 860 \ 861 develop(bool, TraceCallFixup, false, \ 862 "Trace all call fixups") \ 863 \ 864 develop(bool, DeoptimizeALot, false, \ 865 "Deoptimize at every exit from the runtime system") \ 866 \ 867 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 868 "A comma separated list of bcis to deoptimize at") \ 869 \ 870 product(bool, DeoptimizeRandom, false, \ 871 "Deoptimize random frames on random exit from the runtime system")\ 872 \ 873 notproduct(bool, ZombieALot, false, \ 874 "Create zombies (non-entrant) at exit from the runtime system") \ 875 \ 876 product(bool, UnlinkSymbolsALot, false, \ 877 "Unlink unreferenced symbols from the symbol table at safepoints")\ 878 \ 879 notproduct(bool, WalkStackALot, false, \ 880 "Trace stack (no print) at every exit from the runtime system") \ 881 \ 882 product(bool, Debugging, false, \ 883 "Set when executing debug methods in debug.cpp " \ 884 "(to prevent triggering assertions)") \ 885 \ 886 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 887 "Enable strict checks that safepoints cannot happen for threads " \ 888 "that use No_Safepoint_Verifier") \ 889 \ 890 notproduct(bool, VerifyLastFrame, false, \ 891 "Verify oops on last frame on entry to VM") \ 892 \ 893 develop(bool, TraceHandleAllocation, false, \ 894 "Print out warnings when suspiciously many handles are allocated")\ 895 \ 896 product(bool, FailOverToOldVerifier, true, \ 897 "Fail over to old verifier when split verifier fails") \ 898 \ 899 develop(bool, ShowSafepointMsgs, false, \ 900 "Show message about safepoint synchronization") \ 901 \ 902 product(bool, SafepointTimeout, false, \ 903 "Time out and warn or fail after SafepointTimeoutDelay " \ 904 "milliseconds if failed to reach safepoint") \ 905 \ 906 develop(bool, DieOnSafepointTimeout, false, \ 907 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 908 \ 909 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 910 /* typically, at most a few retries are needed */ \ 911 product(intx, SuspendRetryCount, 50, \ 912 "Maximum retry count for an external suspend request") \ 913 range(0, max_intx) \ 914 \ 915 product(intx, SuspendRetryDelay, 5, \ 916 "Milliseconds to delay per retry (* current_retry_count)") \ 917 range(0, max_intx) \ 918 \ 919 product(bool, AssertOnSuspendWaitFailure, false, \ 920 "Assert/Guarantee on external suspend wait failure") \ 921 \ 922 product(bool, TraceSuspendWaitFailures, false, \ 923 "Trace external suspend wait failures") \ 924 \ 925 product(bool, MaxFDLimit, true, \ 926 "Bump the number of file descriptors to maximum in Solaris") \ 927 \ 928 diagnostic(bool, LogEvents, true, \ 929 "Enable the various ring buffer event logs") \ 930 \ 931 diagnostic(uintx, LogEventsBufferEntries, 10, \ 932 "Number of ring buffer event logs") \ 933 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 934 \ 935 product(bool, BytecodeVerificationRemote, true, \ 936 "Enable the Java bytecode verifier for remote classes") \ 937 \ 938 product(bool, BytecodeVerificationLocal, false, \ 939 "Enable the Java bytecode verifier for local classes") \ 940 \ 941 develop(bool, ForceFloatExceptions, trueInDebug, \ 942 "Force exceptions on FP stack under/overflow") \ 943 \ 944 develop(bool, VerifyStackAtCalls, false, \ 945 "Verify that the stack pointer is unchanged after calls") \ 946 \ 947 develop(bool, TraceJavaAssertions, false, \ 948 "Trace java language assertions") \ 949 \ 950 notproduct(bool, CheckAssertionStatusDirectives, false, \ 951 "Temporary - see javaClasses.cpp") \ 952 \ 953 notproduct(bool, PrintMallocFree, false, \ 954 "Trace calls to C heap malloc/free allocation") \ 955 \ 956 product(bool, PrintOopAddress, false, \ 957 "Always print the location of the oop") \ 958 \ 959 notproduct(bool, VerifyCodeCache, false, \ 960 "Verify code cache on memory allocation/deallocation") \ 961 \ 962 develop(bool, UseMallocOnly, false, \ 963 "Use only malloc/free for allocation (no resource area/arena)") \ 964 \ 965 develop(bool, PrintMalloc, false, \ 966 "Print all malloc/free calls") \ 967 \ 968 develop(bool, PrintMallocStatistics, false, \ 969 "Print malloc/free statistics") \ 970 \ 971 develop(bool, ZapResourceArea, trueInDebug, \ 972 "Zap freed resource/arena space with 0xABABABAB") \ 973 \ 974 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 975 "Zap freed VM handle space with 0xBCBCBCBC") \ 976 \ 977 develop(bool, ZapJNIHandleArea, trueInDebug, \ 978 "Zap freed JNI handle space with 0xFEFEFEFE") \ 979 \ 980 notproduct(bool, ZapStackSegments, trueInDebug, \ 981 "Zap allocated/freed stack segments with 0xFADFADED") \ 982 \ 983 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 984 "Zap unused heap space with 0xBAADBABE") \ 985 \ 986 develop(bool, CheckZapUnusedHeapArea, false, \ 987 "Check zapping of unused heap space") \ 988 \ 989 develop(bool, ZapFillerObjects, trueInDebug, \ 990 "Zap filler objects with 0xDEAFBABE") \ 991 \ 992 develop(bool, PrintVMMessages, true, \ 993 "Print VM messages on console") \ 994 \ 995 diagnostic(bool, VerboseVerification, false, \ 996 "Display detailed verification details") \ 997 \ 998 notproduct(uintx, ErrorHandlerTest, 0, \ 999 "If > 0, provokes an error after VM initialization; the value " \ 1000 "determines which error to provoke. See test_error_handler() " \ 1001 "in debug.cpp.") \ 1002 \ 1003 notproduct(uintx, TestCrashInErrorHandler, 0, \ 1004 "If > 0, provokes an error inside VM error handler (a secondary " \ 1005 "crash). see test_error_handler() in debug.cpp.") \ 1006 \ 1007 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1008 "If true, tests SafeFetch inside error handler.") \ 1009 \ 1010 develop(bool, Verbose, false, \ 1011 "Print additional debugging information from other modes") \ 1012 \ 1013 develop(bool, PrintMiscellaneous, false, \ 1014 "Print uncategorized debugging information (requires +Verbose)") \ 1015 \ 1016 develop(bool, WizardMode, false, \ 1017 "Print much more debugging information") \ 1018 \ 1019 product(bool, ShowMessageBoxOnError, false, \ 1020 "Keep process alive on VM fatal error") \ 1021 \ 1022 product(bool, CreateCoredumpOnCrash, true, \ 1023 "Create core/mini dump on VM fatal error") \ 1024 \ 1025 product(uintx, ErrorLogTimeout, 2 * 60, \ 1026 "Timeout, in seconds, to limit the time spent on writing an " \ 1027 "error log in case of a crash.") \ 1028 \ 1029 product_pd(bool, UseOSErrorReporting, \ 1030 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1031 \ 1032 product(bool, SuppressFatalErrorMessage, false, \ 1033 "Report NO fatal error message (avoid deadlock)") \ 1034 \ 1035 product(ccstrlist, OnError, "", \ 1036 "Run user-defined commands on fatal error; see VMError.cpp " \ 1037 "for examples") \ 1038 \ 1039 product(ccstrlist, OnOutOfMemoryError, "", \ 1040 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1041 \ 1042 manageable(bool, HeapDumpBeforeFullGC, false, \ 1043 "Dump heap to file before any major stop-the-world GC") \ 1044 \ 1045 manageable(bool, HeapDumpAfterFullGC, false, \ 1046 "Dump heap to file after any major stop-the-world GC") \ 1047 \ 1048 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1049 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1050 \ 1051 manageable(ccstr, HeapDumpPath, NULL, \ 1052 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1053 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1054 "in the working directory)") \ 1055 \ 1056 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1057 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1058 "when the heap usage is larger than this") \ 1059 \ 1060 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1061 "Approximate segment size when generating a segmented heap dump") \ 1062 \ 1063 develop(bool, BreakAtWarning, false, \ 1064 "Execute breakpoint upon encountering VM warning") \ 1065 \ 1066 develop(bool, TraceVMOperation, false, \ 1067 "Trace VM operations") \ 1068 \ 1069 develop(bool, UseFakeTimers, false, \ 1070 "Tell whether the VM should use system time or a fake timer") \ 1071 \ 1072 product(ccstr, NativeMemoryTracking, "off", \ 1073 "Native memory tracking options") \ 1074 \ 1075 diagnostic(bool, PrintNMTStatistics, false, \ 1076 "Print native memory tracking summary data if it is on") \ 1077 \ 1078 diagnostic(bool, LogCompilation, false, \ 1079 "Log compilation activity in detail to LogFile") \ 1080 \ 1081 product(bool, PrintCompilation, false, \ 1082 "Print compilations") \ 1083 \ 1084 diagnostic(bool, TraceNMethodInstalls, false, \ 1085 "Trace nmethod installation") \ 1086 \ 1087 diagnostic(intx, ScavengeRootsInCode, 2, \ 1088 "0: do not allow scavengable oops in the code cache; " \ 1089 "1: allow scavenging from the code cache; " \ 1090 "2: emit as many constants as the compiler can see") \ 1091 range(0, 2) \ 1092 \ 1093 product(bool, AlwaysRestoreFPU, false, \ 1094 "Restore the FPU control word after every JNI call (expensive)") \ 1095 \ 1096 diagnostic(bool, PrintCompilation2, false, \ 1097 "Print additional statistics per compilation") \ 1098 \ 1099 diagnostic(bool, PrintAdapterHandlers, false, \ 1100 "Print code generated for i2c/c2i adapters") \ 1101 \ 1102 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1103 "Verify that i2c/c2i adapters are called properly") \ 1104 \ 1105 develop(bool, VerifyAdapterSharing, false, \ 1106 "Verify that the code for shared adapters is the equivalent") \ 1107 \ 1108 diagnostic(bool, PrintAssembly, false, \ 1109 "Print assembly code (using external disassembler.so)") \ 1110 \ 1111 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1112 "Print options string passed to disassembler.so") \ 1113 \ 1114 notproduct(bool, PrintNMethodStatistics, false, \ 1115 "Print a summary statistic for the generated nmethods") \ 1116 \ 1117 diagnostic(bool, PrintNMethods, false, \ 1118 "Print assembly code for nmethods when generated") \ 1119 \ 1120 diagnostic(intx, PrintNMethodsAtLevel, -1, \ 1121 "Only print code for nmethods at the given compilation level") \ 1122 \ 1123 diagnostic(bool, PrintNativeNMethods, false, \ 1124 "Print assembly code for native nmethods when generated") \ 1125 \ 1126 develop(bool, PrintDebugInfo, false, \ 1127 "Print debug information for all nmethods when generated") \ 1128 \ 1129 develop(bool, PrintRelocations, false, \ 1130 "Print relocation information for all nmethods when generated") \ 1131 \ 1132 develop(bool, PrintDependencies, false, \ 1133 "Print dependency information for all nmethods when generated") \ 1134 \ 1135 develop(bool, PrintExceptionHandlers, false, \ 1136 "Print exception handler tables for all nmethods when generated") \ 1137 \ 1138 develop(bool, StressCompiledExceptionHandlers, false, \ 1139 "Exercise compiled exception handlers") \ 1140 \ 1141 develop(bool, InterceptOSException, false, \ 1142 "Start debugger when an implicit OS (e.g. NULL) " \ 1143 "exception happens") \ 1144 \ 1145 product(bool, PrintCodeCache, false, \ 1146 "Print the code cache memory usage when exiting") \ 1147 \ 1148 develop(bool, PrintCodeCache2, false, \ 1149 "Print detailed usage information on the code cache when exiting")\ 1150 \ 1151 product(bool, PrintCodeCacheOnCompilation, false, \ 1152 "Print the code cache memory usage each time a method is " \ 1153 "compiled") \ 1154 \ 1155 diagnostic(bool, PrintStubCode, false, \ 1156 "Print generated stub code") \ 1157 \ 1158 product(bool, StackTraceInThrowable, true, \ 1159 "Collect backtrace in throwable when exception happens") \ 1160 \ 1161 product(bool, OmitStackTraceInFastThrow, true, \ 1162 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1163 \ 1164 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1165 "Print bytecode statistics when dumping profiler output") \ 1166 \ 1167 product(bool, ProfilerRecordPC, false, \ 1168 "Collect ticks for each 16 byte interval of compiled code") \ 1169 \ 1170 product(bool, ProfileVM, false, \ 1171 "Profile ticks that fall within VM (either in the VM Thread " \ 1172 "or VM code called through stubs)") \ 1173 \ 1174 product(bool, ProfileIntervals, false, \ 1175 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1176 \ 1177 notproduct(bool, ProfilerCheckIntervals, false, \ 1178 "Collect and print information on spacing of profiler ticks") \ 1179 \ 1180 product(bool, PrintWarnings, true, \ 1181 "Print JVM warnings to output stream") \ 1182 \ 1183 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1184 "Print warnings for stalled SpinLocks") \ 1185 \ 1186 product(bool, RegisterFinalizersAtInit, true, \ 1187 "Register finalizable objects at end of Object.<init> or " \ 1188 "after allocation") \ 1189 \ 1190 develop(bool, RegisterReferences, true, \ 1191 "Tell whether the VM should register soft/weak/final/phantom " \ 1192 "references") \ 1193 \ 1194 develop(bool, IgnoreRewrites, false, \ 1195 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1196 "This is unsafe!") \ 1197 \ 1198 develop(bool, PrintCodeCacheExtension, false, \ 1199 "Print extension of code cache") \ 1200 \ 1201 develop(bool, UsePrivilegedStack, true, \ 1202 "Enable the security JVM functions") \ 1203 \ 1204 develop(bool, ProtectionDomainVerification, true, \ 1205 "Verify protection domain before resolution in system dictionary")\ 1206 \ 1207 product(bool, ClassUnloading, true, \ 1208 "Do unloading of classes") \ 1209 \ 1210 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1211 "Do unloading of classes with a concurrent marking cycle") \ 1212 \ 1213 develop(bool, DisableStartThread, false, \ 1214 "Disable starting of additional Java threads " \ 1215 "(for debugging only)") \ 1216 \ 1217 develop(bool, MemProfiling, false, \ 1218 "Write memory usage profiling to log file") \ 1219 \ 1220 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1221 "Print the system dictionary at exit") \ 1222 \ 1223 experimental(intx, PredictedLoadedClassCount, 0, \ 1224 "Experimental: Tune loaded class cache starting size") \ 1225 \ 1226 diagnostic(bool, UnsyncloadClass, false, \ 1227 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1228 "class loader must call VM synchronized for findClass " \ 1229 "and defineClass.") \ 1230 \ 1231 product(bool, AlwaysLockClassLoader, false, \ 1232 "Require the VM to acquire the class loader lock before calling " \ 1233 "loadClass() even for class loaders registering " \ 1234 "as parallel capable") \ 1235 \ 1236 product(bool, AllowParallelDefineClass, false, \ 1237 "Allow parallel defineClass requests for class loaders " \ 1238 "registering as parallel capable") \ 1239 \ 1240 product(bool, MustCallLoadClassInternal, false, \ 1241 "Call loadClassInternal() rather than loadClass()") \ 1242 \ 1243 product_pd(bool, DontYieldALot, \ 1244 "Throw away obvious excess yield calls") \ 1245 \ 1246 product_pd(bool, ConvertSleepToYield, \ 1247 "Convert sleep(0) to thread yield " \ 1248 "(may be off for Solaris to improve GUI)") \ 1249 \ 1250 product(bool, ConvertYieldToSleep, false, \ 1251 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1252 "behavior") \ 1253 \ 1254 develop(bool, UseDetachedThreads, true, \ 1255 "Use detached threads that are recycled upon termination " \ 1256 "(for Solaris only)") \ 1257 \ 1258 product(bool, UseLWPSynchronization, true, \ 1259 "Use LWP-based instead of libthread-based synchronization " \ 1260 "(SPARC only)") \ 1261 \ 1262 experimental(ccstr, SyncKnobs, NULL, \ 1263 "(Unstable) Various monitor synchronization tunables") \ 1264 \ 1265 experimental(intx, EmitSync, 0, \ 1266 "(Unsafe, Unstable) " \ 1267 "Control emission of inline sync fast-path code") \ 1268 \ 1269 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1270 range(0, max_jint) \ 1271 \ 1272 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1273 \ 1274 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1275 "Experimental Sync flags") \ 1276 \ 1277 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1278 \ 1279 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1280 \ 1281 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1282 \ 1283 experimental(intx, hashCode, 5, \ 1284 "(Unstable) select hashCode generation algorithm") \ 1285 \ 1286 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1287 "(Unstable, Linux-specific) " \ 1288 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1289 \ 1290 product(bool, FilterSpuriousWakeups, true, \ 1291 "When true prevents OS-level spurious, or premature, wakeups " \ 1292 "from Object.wait (Ignored for Windows)") \ 1293 \ 1294 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1295 \ 1296 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1297 \ 1298 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1299 \ 1300 develop(bool, UsePthreads, false, \ 1301 "Use pthread-based instead of libthread-based synchronization " \ 1302 "(SPARC only)") \ 1303 \ 1304 product(bool, ReduceSignalUsage, false, \ 1305 "Reduce the use of OS signals in Java and/or the VM") \ 1306 \ 1307 develop_pd(bool, ShareVtableStubs, \ 1308 "Share vtable stubs (smaller code but worse branch prediction") \ 1309 \ 1310 develop(bool, LoadLineNumberTables, true, \ 1311 "Tell whether the class file parser loads line number tables") \ 1312 \ 1313 develop(bool, LoadLocalVariableTables, true, \ 1314 "Tell whether the class file parser loads local variable tables") \ 1315 \ 1316 develop(bool, LoadLocalVariableTypeTables, true, \ 1317 "Tell whether the class file parser loads local variable type" \ 1318 "tables") \ 1319 \ 1320 product(bool, AllowUserSignalHandlers, false, \ 1321 "Do not complain if the application installs signal handlers " \ 1322 "(Solaris & Linux only)") \ 1323 \ 1324 product(bool, UseSignalChaining, true, \ 1325 "Use signal-chaining to invoke signal handlers installed " \ 1326 "by the application (Solaris & Linux only)") \ 1327 \ 1328 product(bool, AllowJNIEnvProxy, false, \ 1329 "Allow JNIEnv proxies for jdbx") \ 1330 \ 1331 product(bool, RestoreMXCSROnJNICalls, false, \ 1332 "Restore MXCSR when returning from JNI calls") \ 1333 \ 1334 product(bool, CheckJNICalls, false, \ 1335 "Verify all arguments to JNI calls") \ 1336 \ 1337 product(bool, CheckEndorsedAndExtDirs, false, \ 1338 "Verify the endorsed and extension directories are not used") \ 1339 \ 1340 product(bool, UseFastJNIAccessors, true, \ 1341 "Use optimized versions of Get<Primitive>Field") \ 1342 \ 1343 product(intx, MaxJNILocalCapacity, 65536, \ 1344 "Maximum allowable local JNI handle capacity to " \ 1345 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1346 "where <= 0 is unlimited, default: 65536") \ 1347 range(min_intx, max_intx) \ 1348 \ 1349 product(bool, EagerXrunInit, false, \ 1350 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1351 "but not all -Xrun libraries may support the state of the VM " \ 1352 "at this time") \ 1353 \ 1354 product(bool, PreserveAllAnnotations, false, \ 1355 "Preserve RuntimeInvisibleAnnotations as well " \ 1356 "as RuntimeVisibleAnnotations") \ 1357 \ 1358 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1359 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1360 \ 1361 product(bool, UseXMMForArrayCopy, false, \ 1362 "Use SSE2 MOVQ instruction for Arraycopy") \ 1363 \ 1364 product(intx, FieldsAllocationStyle, 1, \ 1365 "0 - type based with oops first, " \ 1366 "1 - with oops last, " \ 1367 "2 - oops in super and sub classes are together") \ 1368 range(0, 2) \ 1369 \ 1370 product(bool, CompactFields, true, \ 1371 "Allocate nonstatic fields in gaps between previous fields") \ 1372 \ 1373 notproduct(bool, PrintFieldLayout, false, \ 1374 "Print field layout for each class") \ 1375 \ 1376 /* Need to limit the extent of the padding to reasonable size. */\ 1377 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1378 /* aggressive prefetching, while still leaving the room for segregating */\ 1379 /* among the distinct pages. */\ 1380 product(intx, ContendedPaddingWidth, 128, \ 1381 "How many bytes to pad the fields/classes marked @Contended with")\ 1382 range(0, 8192) \ 1383 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1384 \ 1385 product(bool, EnableContended, true, \ 1386 "Enable @Contended annotation support") \ 1387 \ 1388 product(bool, RestrictContended, true, \ 1389 "Restrict @Contended to trusted classes") \ 1390 \ 1391 product(bool, UseBiasedLocking, true, \ 1392 "Enable biased locking in JVM") \ 1393 \ 1394 product(intx, BiasedLockingStartupDelay, 4000, \ 1395 "Number of milliseconds to wait before enabling biased locking") \ 1396 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1397 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1398 \ 1399 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1400 "Print statistics of biased locking in JVM") \ 1401 \ 1402 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1403 "Threshold of number of revocations per type to try to " \ 1404 "rebias all objects in the heap of that type") \ 1405 range(0, max_intx) \ 1406 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1407 \ 1408 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1409 "Threshold of number of revocations per type to permanently " \ 1410 "revoke biases of all objects in the heap of that type") \ 1411 range(0, max_intx) \ 1412 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1413 \ 1414 product(intx, BiasedLockingDecayTime, 25000, \ 1415 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1416 "type after previous bulk rebias") \ 1417 range(500, max_intx) \ 1418 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1419 \ 1420 /* tracing */ \ 1421 \ 1422 notproduct(bool, TraceRuntimeCalls, false, \ 1423 "Trace run-time calls") \ 1424 \ 1425 develop(bool, TraceJNICalls, false, \ 1426 "Trace JNI calls") \ 1427 \ 1428 develop(bool, StressRewriter, false, \ 1429 "Stress linktime bytecode rewriting") \ 1430 \ 1431 notproduct(bool, TraceJVMCalls, false, \ 1432 "Trace JVM calls") \ 1433 \ 1434 product(ccstr, TraceJVMTI, NULL, \ 1435 "Trace flags for JVMTI functions and events") \ 1436 \ 1437 /* This option can change an EMCP method into an obsolete method. */ \ 1438 /* This can affect tests that except specific methods to be EMCP. */ \ 1439 /* This option should be used with caution. */ \ 1440 product(bool, StressLdcRewrite, false, \ 1441 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1442 \ 1443 product(uintx, TraceRedefineClasses, 0, \ 1444 "Trace level for JVMTI RedefineClasses") \ 1445 range(0, 0xFFFFFFFF) \ 1446 \ 1447 /* change to false by default sometime after Mustang */ \ 1448 product(bool, VerifyMergedCPBytecodes, true, \ 1449 "Verify bytecodes after RedefineClasses constant pool merging") \ 1450 \ 1451 develop(bool, TraceJNIHandleAllocation, false, \ 1452 "Trace allocation/deallocation of JNI handle blocks") \ 1453 \ 1454 develop(bool, TraceBytecodes, false, \ 1455 "Trace bytecode execution") \ 1456 \ 1457 develop(bool, TraceClassInitialization, false, \ 1458 "Trace class initialization") \ 1459 \ 1460 product(bool, TraceExceptions, false, \ 1461 "Trace exceptions") \ 1462 \ 1463 develop(bool, TraceICs, false, \ 1464 "Trace inline cache changes") \ 1465 \ 1466 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1467 "Trace method invocation counter overflow") \ 1468 \ 1469 develop(bool, TraceInlineCacheClearing, false, \ 1470 "Trace clearing of inline caches in nmethods") \ 1471 \ 1472 develop(bool, TraceDependencies, false, \ 1473 "Trace dependencies") \ 1474 \ 1475 develop(bool, VerifyDependencies, trueInDebug, \ 1476 "Exercise and verify the compilation dependency mechanism") \ 1477 \ 1478 develop(bool, TraceNewOopMapGeneration, false, \ 1479 "Trace OopMapGeneration") \ 1480 \ 1481 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1482 "Trace OopMapGeneration: print detailed cell states") \ 1483 \ 1484 develop(bool, TimeOopMap, false, \ 1485 "Time calls to GenerateOopMap::compute_map() in sum") \ 1486 \ 1487 develop(bool, TimeOopMap2, false, \ 1488 "Time calls to GenerateOopMap::compute_map() individually") \ 1489 \ 1490 develop(bool, TraceMonitorMismatch, false, \ 1491 "Trace monitor matching failures during OopMapGeneration") \ 1492 \ 1493 develop(bool, TraceOopMapRewrites, false, \ 1494 "Trace rewriting of method oops during oop map generation") \ 1495 \ 1496 develop(bool, TraceICBuffer, false, \ 1497 "Trace usage of IC buffer") \ 1498 \ 1499 develop(bool, TraceCompiledIC, false, \ 1500 "Trace changes of compiled IC") \ 1501 \ 1502 develop(bool, TraceStartupTime, false, \ 1503 "Trace setup time") \ 1504 \ 1505 develop(bool, TraceProtectionDomainVerification, false, \ 1506 "Trace protection domain verification") \ 1507 \ 1508 develop(bool, TraceClearedExceptions, false, \ 1509 "Print when an exception is forcibly cleared") \ 1510 \ 1511 product(bool, TraceClassResolution, false, \ 1512 "Trace all constant pool resolutions (for debugging)") \ 1513 \ 1514 product(bool, TraceBiasedLocking, false, \ 1515 "Trace biased locking in JVM") \ 1516 \ 1517 product(bool, TraceMonitorInflation, false, \ 1518 "Trace monitor inflation in JVM") \ 1519 \ 1520 /* gc */ \ 1521 \ 1522 product(bool, UseSerialGC, false, \ 1523 "Use the Serial garbage collector") \ 1524 \ 1525 product(bool, UseG1GC, false, \ 1526 "Use the Garbage-First garbage collector") \ 1527 \ 1528 product(bool, UseParallelGC, false, \ 1529 "Use the Parallel Scavenge garbage collector") \ 1530 \ 1531 product(bool, UseParallelOldGC, false, \ 1532 "Use the Parallel Old garbage collector") \ 1533 \ 1534 product(uintx, HeapMaximumCompactionInterval, 20, \ 1535 "How often should we maximally compact the heap (not allowing " \ 1536 "any dead space)") \ 1537 \ 1538 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1539 "The collection count for the first maximum compaction") \ 1540 \ 1541 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1542 "Use maximum compaction in the Parallel Old garbage collector " \ 1543 "for a system GC") \ 1544 \ 1545 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1546 "The mean used by the parallel compact dead wood " \ 1547 "limiter (a number between 0-100)") \ 1548 range(0, 100) \ 1549 \ 1550 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1551 "The standard deviation used by the parallel compact dead wood " \ 1552 "limiter (a number between 0-100)") \ 1553 range(0, 100) \ 1554 \ 1555 product(uint, ParallelGCThreads, 0, \ 1556 "Number of parallel threads parallel gc will use") \ 1557 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1558 \ 1559 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1560 "Use semaphore synchronization for the GC Threads, " \ 1561 "instead of synchronization based on mutexes") \ 1562 \ 1563 product(bool, UseDynamicNumberOfGCThreads, false, \ 1564 "Dynamically choose the number of parallel threads " \ 1565 "parallel gc will use") \ 1566 \ 1567 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1568 "Force dynamic selection of the number of " \ 1569 "parallel threads parallel gc will use to aid debugging") \ 1570 \ 1571 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1572 "Size of heap (bytes) per GC thread used in calculating the " \ 1573 "number of GC threads") \ 1574 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1575 \ 1576 product(uint, ConcGCThreads, 0, \ 1577 "Number of threads concurrent gc will use") \ 1578 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1579 \ 1580 product(uintx, GCTaskTimeStampEntries, 200, \ 1581 "Number of time stamp entries per gc worker thread") \ 1582 range(1, max_uintx) \ 1583 \ 1584 product(bool, AlwaysTenure, false, \ 1585 "Always tenure objects in eden (ParallelGC only)") \ 1586 \ 1587 product(bool, NeverTenure, false, \ 1588 "Never tenure objects in eden, may tenure on overflow " \ 1589 "(ParallelGC only)") \ 1590 \ 1591 product(bool, ScavengeBeforeFullGC, true, \ 1592 "Scavenge youngest generation before each full GC.") \ 1593 \ 1594 product(bool, UseConcMarkSweepGC, false, \ 1595 "Use Concurrent Mark-Sweep GC in the old generation") \ 1596 \ 1597 product(bool, ExplicitGCInvokesConcurrent, false, \ 1598 "A System.gc() request invokes a concurrent collection; " \ 1599 "(effective only when using concurrent collectors)") \ 1600 \ 1601 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1602 "A System.gc() request invokes a concurrent collection and " \ 1603 "also unloads classes during such a concurrent gc cycle " \ 1604 "(effective only when UseConcMarkSweepGC)") \ 1605 \ 1606 product(bool, GCLockerInvokesConcurrent, false, \ 1607 "The exit of a JNI critical section necessitating a scavenge, " \ 1608 "also kicks off a background concurrent collection") \ 1609 \ 1610 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1611 "How much the GC can expand the eden by while the GC locker " \ 1612 "is active (as a percentage)") \ 1613 range(0, 100) \ 1614 \ 1615 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1616 "Number of times to retry allocations when " \ 1617 "blocked by the GC locker") \ 1618 \ 1619 product(bool, UseCMSBestFit, true, \ 1620 "Use CMS best fit allocation strategy") \ 1621 \ 1622 product(bool, UseParNewGC, false, \ 1623 "Use parallel threads in the new generation") \ 1624 \ 1625 product(uintx, ParallelGCBufferWastePct, 10, \ 1626 "Wasted fraction of parallel allocation buffer") \ 1627 range(0, 100) \ 1628 \ 1629 product(uintx, TargetPLABWastePct, 10, \ 1630 "Target wasted space in last buffer as percent of overall " \ 1631 "allocation") \ 1632 range(1, 100) \ 1633 \ 1634 product(uintx, PLABWeight, 75, \ 1635 "Percentage (0-100) used to weight the current sample when " \ 1636 "computing exponentially decaying average for ResizePLAB") \ 1637 range(0, 100) \ 1638 \ 1639 product(bool, ResizePLAB, true, \ 1640 "Dynamically resize (survivor space) promotion LAB's") \ 1641 \ 1642 product(intx, ParGCArrayScanChunk, 50, \ 1643 "Scan a subset of object array and push remainder, if array is " \ 1644 "bigger than this") \ 1645 range(1, max_intx) \ 1646 \ 1647 product(bool, ParGCUseLocalOverflow, false, \ 1648 "Instead of a global overflow list, use local overflow stacks") \ 1649 \ 1650 product(bool, ParGCTrimOverflow, true, \ 1651 "Eagerly trim the local overflow lists " \ 1652 "(when ParGCUseLocalOverflow)") \ 1653 \ 1654 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1655 "Simulate work queue overflow in ParNew") \ 1656 \ 1657 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1658 "An `interval' counter that determines how frequently " \ 1659 "we simulate overflow; a smaller number increases frequency") \ 1660 \ 1661 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1662 "The desired number of objects to claim from the overflow list") \ 1663 \ 1664 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1665 "The number of strides per worker thread that we divide up the " \ 1666 "card table scanning work into") \ 1667 range(1, max_uintx) \ 1668 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1669 \ 1670 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1671 "The number of cards in each chunk of the parallel chunks used " \ 1672 "during card table scanning") \ 1673 range(1, max_intx) \ 1674 \ 1675 product(uintx, OldPLABWeight, 50, \ 1676 "Percentage (0-100) used to weight the current sample when " \ 1677 "computing exponentially decaying average for resizing " \ 1678 "OldPLABSize") \ 1679 range(0, 100) \ 1680 \ 1681 product(bool, ResizeOldPLAB, true, \ 1682 "Dynamically resize (old gen) promotion LAB's") \ 1683 \ 1684 product(size_t, CMSOldPLABMax, 1024, \ 1685 "Maximum size of CMS gen promotion LAB caches per worker " \ 1686 "per block size") \ 1687 range(1, max_uintx) \ 1688 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1689 \ 1690 product(size_t, CMSOldPLABMin, 16, \ 1691 "Minimum size of CMS gen promotion LAB caches per worker " \ 1692 "per block size") \ 1693 range(1, max_uintx) \ 1694 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1695 \ 1696 product(uintx, CMSOldPLABNumRefills, 4, \ 1697 "Nominal number of refills of CMS gen promotion LAB cache " \ 1698 "per worker per block size") \ 1699 range(1, max_uintx) \ 1700 \ 1701 product(bool, CMSOldPLABResizeQuicker, false, \ 1702 "React on-the-fly during a scavenge to a sudden " \ 1703 "change in block demand rate") \ 1704 \ 1705 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1706 "The tolerance of the phase-change detector for on-the-fly " \ 1707 "PLAB resizing during a scavenge") \ 1708 range(1, max_uintx) \ 1709 \ 1710 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1711 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1712 "during a scavenge") \ 1713 \ 1714 product(bool, AlwaysPreTouch, false, \ 1715 "Force all freshly committed pages to be pre-touched") \ 1716 \ 1717 product_pd(size_t, CMSYoungGenPerWorker, \ 1718 "The maximum size of young gen chosen by default per GC worker " \ 1719 "thread available") \ 1720 range(1, max_uintx) \ 1721 \ 1722 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1723 "Percentage (0-100) used to add conservatism when computing the " \ 1724 "duty cycle") \ 1725 range(0, 100) \ 1726 \ 1727 product(uintx, CMSExpAvgFactor, 50, \ 1728 "Percentage (0-100) used to weight the current sample when " \ 1729 "computing exponential averages for CMS statistics") \ 1730 range(0, 100) \ 1731 \ 1732 product(uintx, CMS_FLSWeight, 75, \ 1733 "Percentage (0-100) used to weight the current sample when " \ 1734 "computing exponentially decaying averages for CMS FLS " \ 1735 "statistics") \ 1736 range(0, 100) \ 1737 \ 1738 product(uintx, CMS_FLSPadding, 1, \ 1739 "The multiple of deviation from mean to use for buffering " \ 1740 "against volatility in free list demand") \ 1741 \ 1742 product(uintx, FLSCoalescePolicy, 2, \ 1743 "CMS: aggressiveness level for coalescing, increasing " \ 1744 "from 0 to 4") \ 1745 range(0, 4) \ 1746 \ 1747 product(bool, FLSAlwaysCoalesceLarge, false, \ 1748 "CMS: larger free blocks are always available for coalescing") \ 1749 \ 1750 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1751 "CMS: the smaller the percentage the greater the coalescing " \ 1752 "force") \ 1753 range(0.0, 1.0) \ 1754 \ 1755 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1756 "CMS: the factor by which to inflate estimated demand of small " \ 1757 "block sizes to prevent coalescing with an adjoining block") \ 1758 range(0.0, DBL_MAX) \ 1759 \ 1760 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1761 "CMS: the factor by which to inflate estimated demand of large " \ 1762 "block sizes to prevent coalescing with an adjoining block") \ 1763 range(0.0, DBL_MAX) \ 1764 \ 1765 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1766 "CMS: the factor by which to inflate estimated demand of small " \ 1767 "block sizes to prevent splitting to supply demand for smaller " \ 1768 "blocks") \ 1769 range(0.0, DBL_MAX) \ 1770 \ 1771 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1772 "CMS: the factor by which to inflate estimated demand of large " \ 1773 "block sizes to prevent splitting to supply demand for smaller " \ 1774 "blocks") \ 1775 range(0.0, DBL_MAX) \ 1776 \ 1777 product(bool, CMSExtrapolateSweep, false, \ 1778 "CMS: cushion for block demand during sweep") \ 1779 \ 1780 product(uintx, CMS_SweepWeight, 75, \ 1781 "Percentage (0-100) used to weight the current sample when " \ 1782 "computing exponentially decaying average for inter-sweep " \ 1783 "duration") \ 1784 range(0, 100) \ 1785 \ 1786 product(uintx, CMS_SweepPadding, 1, \ 1787 "The multiple of deviation from mean to use for buffering " \ 1788 "against volatility in inter-sweep duration") \ 1789 \ 1790 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1791 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1792 "duration exceeds this threshold in milliseconds") \ 1793 \ 1794 product(bool, CMSClassUnloadingEnabled, true, \ 1795 "Whether class unloading enabled when using CMS GC") \ 1796 \ 1797 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1798 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1799 "count for which classes may not be unloaded") \ 1800 \ 1801 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1802 "Replenish an indexed free list with this number of chunks") \ 1803 range(1, max_uintx) \ 1804 \ 1805 product(bool, CMSReplenishIntermediate, true, \ 1806 "Replenish all intermediate free-list caches") \ 1807 \ 1808 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1809 "When satisfying batched demand, split blocks from the " \ 1810 "IndexedFreeList whose size is a multiple of requested size") \ 1811 \ 1812 product(bool, CMSLoopWarn, false, \ 1813 "Warn in case of excessive CMS looping") \ 1814 \ 1815 /* where does the range max value of (max_jint - 1) come from? */ \ 1816 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1817 "Maximum size of marking stack") \ 1818 range(1, (max_jint - 1)) \ 1819 \ 1820 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1821 "Size of marking stack") \ 1822 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1823 \ 1824 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1825 "Simulate frequent marking stack / work queue overflow") \ 1826 \ 1827 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1828 "An \"interval\" counter that determines how frequently " \ 1829 "to simulate overflow; a smaller number increases frequency") \ 1830 \ 1831 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1832 "Maximum number of abortable preclean iterations, if > 0") \ 1833 \ 1834 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1835 "Maximum time in abortable preclean (in milliseconds)") \ 1836 range(0, max_intx) \ 1837 \ 1838 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1839 "Nominal minimum work per abortable preclean iteration") \ 1840 \ 1841 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1842 "Time that we sleep between iterations when not given " \ 1843 "enough work per iteration") \ 1844 range(0, max_intx) \ 1845 \ 1846 product(size_t, CMSRescanMultiple, 32, \ 1847 "Size (in cards) of CMS parallel rescan task") \ 1848 range(1, max_uintx) \ 1849 \ 1850 product(size_t, CMSConcMarkMultiple, 32, \ 1851 "Size (in cards) of CMS concurrent MT marking task") \ 1852 range(1, max_uintx) \ 1853 \ 1854 product(bool, CMSAbortSemantics, false, \ 1855 "Whether abort-on-overflow semantics is implemented") \ 1856 \ 1857 product(bool, CMSParallelInitialMarkEnabled, true, \ 1858 "Use the parallel initial mark.") \ 1859 \ 1860 product(bool, CMSParallelRemarkEnabled, true, \ 1861 "Whether parallel remark enabled (only if ParNewGC)") \ 1862 \ 1863 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1864 "Whether parallel remark of survivor space " \ 1865 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1866 \ 1867 product(bool, CMSPLABRecordAlways, true, \ 1868 "Always record survivor space PLAB boundaries (effective only " \ 1869 "if CMSParallelSurvivorRemarkEnabled)") \ 1870 \ 1871 product(bool, CMSEdenChunksRecordAlways, true, \ 1872 "Always record eden chunks used for the parallel initial mark " \ 1873 "or remark of eden") \ 1874 \ 1875 product(bool, CMSConcurrentMTEnabled, true, \ 1876 "Whether multi-threaded concurrent work enabled " \ 1877 "(effective only if ParNewGC)") \ 1878 \ 1879 product(bool, CMSPrecleaningEnabled, true, \ 1880 "Whether concurrent precleaning enabled") \ 1881 \ 1882 product(uintx, CMSPrecleanIter, 3, \ 1883 "Maximum number of precleaning iteration passes") \ 1884 range(0, 9) \ 1885 \ 1886 product(uintx, CMSPrecleanDenominator, 3, \ 1887 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1888 "ratio") \ 1889 range(1, max_uintx) \ 1890 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1891 \ 1892 product(uintx, CMSPrecleanNumerator, 2, \ 1893 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1894 "ratio") \ 1895 range(0, max_uintx-1) \ 1896 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1897 \ 1898 product(bool, CMSPrecleanRefLists1, true, \ 1899 "Preclean ref lists during (initial) preclean phase") \ 1900 \ 1901 product(bool, CMSPrecleanRefLists2, false, \ 1902 "Preclean ref lists during abortable preclean phase") \ 1903 \ 1904 product(bool, CMSPrecleanSurvivors1, false, \ 1905 "Preclean survivors during (initial) preclean phase") \ 1906 \ 1907 product(bool, CMSPrecleanSurvivors2, true, \ 1908 "Preclean survivors during abortable preclean phase") \ 1909 \ 1910 product(uintx, CMSPrecleanThreshold, 1000, \ 1911 "Do not iterate again if number of dirty cards is less than this")\ 1912 range(100, max_uintx) \ 1913 \ 1914 product(bool, CMSCleanOnEnter, true, \ 1915 "Clean-on-enter optimization for reducing number of dirty cards") \ 1916 \ 1917 product(uintx, CMSRemarkVerifyVariant, 1, \ 1918 "Choose variant (1,2) of verification following remark") \ 1919 range(1, 2) \ 1920 \ 1921 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1922 "If Eden size is below this, do not try to schedule remark") \ 1923 \ 1924 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1925 "The Eden occupancy percentage (0-100) at which " \ 1926 "to try and schedule remark pause") \ 1927 range(0, 100) \ 1928 \ 1929 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1930 "Start sampling eden top at least before young gen " \ 1931 "occupancy reaches 1/<ratio> of the size at which " \ 1932 "we plan to schedule remark") \ 1933 range(1, max_uintx) \ 1934 \ 1935 product(uintx, CMSSamplingGrain, 16*K, \ 1936 "The minimum distance between eden samples for CMS (see above)") \ 1937 range(1, max_uintx) \ 1938 \ 1939 product(bool, CMSScavengeBeforeRemark, false, \ 1940 "Attempt scavenge before the CMS remark step") \ 1941 \ 1942 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1943 "Don't drain below this size per parallel worker/thief") \ 1944 range(1, max_juint) \ 1945 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1946 \ 1947 manageable(intx, CMSWaitDuration, 2000, \ 1948 "Time in milliseconds that CMS thread waits for young GC") \ 1949 \ 1950 develop(uintx, CMSCheckInterval, 1000, \ 1951 "Interval in milliseconds that CMS thread checks if it " \ 1952 "should start a collection cycle") \ 1953 \ 1954 product(bool, CMSYield, true, \ 1955 "Yield between steps of CMS") \ 1956 \ 1957 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1958 "Bitmap operations should process at most this many bits " \ 1959 "between yields") \ 1960 range(1, max_uintx) \ 1961 \ 1962 product(bool, CMSPrintChunksInDump, false, \ 1963 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1964 "more detailed information about the free chunks") \ 1965 \ 1966 product(bool, CMSPrintObjectsInDump, false, \ 1967 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1968 "more detailed information about the allocated objects") \ 1969 \ 1970 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1971 "Verify that all references across the FLS boundary " \ 1972 "are to valid objects") \ 1973 \ 1974 diagnostic(bool, FLSVerifyLists, false, \ 1975 "Do lots of (expensive) FreeListSpace verification") \ 1976 \ 1977 diagnostic(bool, FLSVerifyIndexTable, false, \ 1978 "Do lots of (expensive) FLS index table verification") \ 1979 \ 1980 develop(bool, FLSVerifyDictionary, false, \ 1981 "Do lots of (expensive) FLS dictionary verification") \ 1982 \ 1983 develop(bool, VerifyBlockOffsetArray, false, \ 1984 "Do (expensive) block offset array verification") \ 1985 \ 1986 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1987 "Maintain _unallocated_block in BlockOffsetArray " \ 1988 "(currently applicable only to CMS collector)") \ 1989 \ 1990 product(intx, RefDiscoveryPolicy, 0, \ 1991 "Select type of reference discovery policy: " \ 1992 "reference-based(0) or referent-based(1)") \ 1993 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1994 ReferenceProcessor::DiscoveryPolicyMax) \ 1995 \ 1996 product(bool, ParallelRefProcEnabled, false, \ 1997 "Enable parallel reference processing whenever possible") \ 1998 \ 1999 product(bool, ParallelRefProcBalancingEnabled, true, \ 2000 "Enable balancing of reference processing queues") \ 2001 \ 2002 product(uintx, CMSTriggerRatio, 80, \ 2003 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2004 "allocated before a CMS collection cycle commences") \ 2005 range(0, 100) \ 2006 \ 2007 product(uintx, CMSBootstrapOccupancy, 50, \ 2008 "Percentage CMS generation occupancy at which to " \ 2009 "initiate CMS collection for bootstrapping collection stats") \ 2010 range(0, 100) \ 2011 \ 2012 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2013 "Percentage CMS generation occupancy to start a CMS collection " \ 2014 "cycle. A negative value means that CMSTriggerRatio is used") \ 2015 range(min_intx, 100) \ 2016 \ 2017 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2018 "Percentage of the (entire) heap occupancy to start a " \ 2019 "concurrent GC cycle. It is used by GCs that trigger a " \ 2020 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2021 "not just one of the generations (e.g., G1). A value of 0 " \ 2022 "denotes 'do constant GC cycles'.") \ 2023 range(0, 100) \ 2024 \ 2025 manageable(intx, CMSTriggerInterval, -1, \ 2026 "Commence a CMS collection cycle (at least) every so many " \ 2027 "milliseconds (0 permanently, -1 disabled)") \ 2028 range(-1, max_intx) \ 2029 \ 2030 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2031 "Only use occupancy as a criterion for starting a CMS collection")\ 2032 \ 2033 product(uintx, CMSIsTooFullPercentage, 98, \ 2034 "An absolute ceiling above which CMS will always consider the " \ 2035 "unloading of classes when class unloading is enabled") \ 2036 range(0, 100) \ 2037 \ 2038 develop(bool, CMSTestInFreeList, false, \ 2039 "Check if the coalesced range is already in the " \ 2040 "free lists as claimed") \ 2041 \ 2042 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2043 "Check that all the garbage collected was returned to the " \ 2044 "free lists") \ 2045 \ 2046 notproduct(bool, ScavengeALot, false, \ 2047 "Force scavenge at every Nth exit from the runtime system " \ 2048 "(N=ScavengeALotInterval)") \ 2049 \ 2050 develop(bool, FullGCALot, false, \ 2051 "Force full gc at every Nth exit from the runtime system " \ 2052 "(N=FullGCALotInterval)") \ 2053 \ 2054 notproduct(bool, GCALotAtAllSafepoints, false, \ 2055 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2056 \ 2057 notproduct(bool, PromotionFailureALot, false, \ 2058 "Use promotion failure handling on every youngest generation " \ 2059 "collection") \ 2060 \ 2061 develop(uintx, PromotionFailureALotCount, 1000, \ 2062 "Number of promotion failures occurring at PLAB " \ 2063 "refill attempts (ParNew) or promotion attempts " \ 2064 "(other young collectors)") \ 2065 \ 2066 develop(uintx, PromotionFailureALotInterval, 5, \ 2067 "Total collections between promotion failures a lot") \ 2068 \ 2069 experimental(uintx, WorkStealingSleepMillis, 1, \ 2070 "Sleep time when sleep is used for yields") \ 2071 \ 2072 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2073 "Number of yields before a sleep is done during work stealing") \ 2074 \ 2075 experimental(uintx, WorkStealingHardSpins, 4096, \ 2076 "Number of iterations in a spin loop between checks on " \ 2077 "time out of hard spin") \ 2078 \ 2079 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2080 "Ratio of hard spins to calls to yield") \ 2081 \ 2082 develop(uintx, ObjArrayMarkingStride, 512, \ 2083 "Number of object array elements to push onto the marking stack " \ 2084 "before pushing a continuation entry") \ 2085 \ 2086 develop(bool, MetadataAllocationFailALot, false, \ 2087 "Fail metadata allocations at intervals controlled by " \ 2088 "MetadataAllocationFailALotInterval") \ 2089 \ 2090 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2091 "Metadata allocation failure a lot interval") \ 2092 \ 2093 develop(bool, TraceMetadataChunkAllocation, false, \ 2094 "Trace chunk metadata allocations") \ 2095 \ 2096 notproduct(bool, ExecuteInternalVMTests, false, \ 2097 "Enable execution of internal VM tests") \ 2098 \ 2099 notproduct(bool, VerboseInternalVMTests, false, \ 2100 "Turn on logging for internal VM tests.") \ 2101 \ 2102 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2103 \ 2104 product_pd(bool, ResizeTLAB, \ 2105 "Dynamically resize TLAB size for threads") \ 2106 \ 2107 product(bool, ZeroTLAB, false, \ 2108 "Zero out the newly created TLAB") \ 2109 \ 2110 product(bool, FastTLABRefill, true, \ 2111 "Use fast TLAB refill code") \ 2112 \ 2113 product(bool, TLABStats, true, \ 2114 "Provide more detailed and expensive TLAB statistics.") \ 2115 \ 2116 product_pd(bool, NeverActAsServerClassMachine, \ 2117 "Never act like a server-class machine") \ 2118 \ 2119 product(bool, AlwaysActAsServerClassMachine, false, \ 2120 "Always act like a server-class machine") \ 2121 \ 2122 product_pd(uint64_t, MaxRAM, \ 2123 "Real memory size (in bytes) used to set maximum heap size") \ 2124 range(0, 0XFFFFFFFFFFFFFFFF) \ 2125 \ 2126 product(size_t, ErgoHeapSizeLimit, 0, \ 2127 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2128 "MaxRAM / MaxRAMFraction") \ 2129 \ 2130 product(uintx, MaxRAMFraction, 4, \ 2131 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2132 "size") \ 2133 range(1, max_uintx) \ 2134 \ 2135 product(uintx, MinRAMFraction, 2, \ 2136 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2137 "size on systems with small physical memory size") \ 2138 range(1, max_uintx) \ 2139 \ 2140 product(uintx, InitialRAMFraction, 64, \ 2141 "Fraction (1/n) of real memory used for initial heap size") \ 2142 range(1, max_uintx) \ 2143 \ 2144 develop(uintx, MaxVirtMemFraction, 2, \ 2145 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2146 "determining maximum heap size") \ 2147 \ 2148 product(bool, UseAutoGCSelectPolicy, false, \ 2149 "Use automatic collection selection policy") \ 2150 \ 2151 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2152 "Automatic GC selection pause threshold in milliseconds") \ 2153 \ 2154 product(bool, UseAdaptiveSizePolicy, true, \ 2155 "Use adaptive generation sizing policies") \ 2156 \ 2157 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2158 "Use adaptive survivor sizing policies") \ 2159 \ 2160 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2161 "Use adaptive young-old sizing policies at minor collections") \ 2162 \ 2163 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2164 "Use adaptive young-old sizing policies at major collections") \ 2165 \ 2166 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2167 "Include statistics from System.gc() for adaptive size policy") \ 2168 \ 2169 product(bool, UseAdaptiveGCBoundary, false, \ 2170 "Allow young-old boundary to move") \ 2171 \ 2172 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2173 "Resize the virtual spaces of the young or old generations") \ 2174 range(-1, 1) \ 2175 \ 2176 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2177 "Policy for changing generation size for throughput goals") \ 2178 range(0, 1) \ 2179 \ 2180 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2181 "Number of steps where heuristics is used before data is used") \ 2182 \ 2183 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2184 "Number of collections before the adaptive sizing is started") \ 2185 \ 2186 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2187 "Collection interval for printing information; zero means never") \ 2188 \ 2189 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2190 "Use adaptive minimum footprint as a goal") \ 2191 \ 2192 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2193 "Weight given to exponential resizing, between 0 and 100") \ 2194 range(0, 100) \ 2195 \ 2196 product(uintx, AdaptiveTimeWeight, 25, \ 2197 "Weight given to time in adaptive policy, between 0 and 100") \ 2198 range(0, 100) \ 2199 \ 2200 product(uintx, PausePadding, 1, \ 2201 "How much buffer to keep for pause time") \ 2202 \ 2203 product(uintx, PromotedPadding, 3, \ 2204 "How much buffer to keep for promotion failure") \ 2205 \ 2206 product(uintx, SurvivorPadding, 3, \ 2207 "How much buffer to keep for survivor overflow") \ 2208 \ 2209 product(uintx, ThresholdTolerance, 10, \ 2210 "Allowed collection cost difference between generations") \ 2211 range(0, 100) \ 2212 \ 2213 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2214 "If collection costs are within margin, reduce both by full " \ 2215 "delta") \ 2216 \ 2217 product(uintx, YoungGenerationSizeIncrement, 20, \ 2218 "Adaptive size percentage change in young generation") \ 2219 range(0, 100) \ 2220 \ 2221 product(uintx, YoungGenerationSizeSupplement, 80, \ 2222 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2223 range(0, 100) \ 2224 \ 2225 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2226 "Decay factor to YoungedGenerationSizeSupplement") \ 2227 range(1, max_uintx) \ 2228 \ 2229 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2230 "Adaptive size percentage change in tenured generation") \ 2231 range(0, 100) \ 2232 \ 2233 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2234 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2235 range(0, 100) \ 2236 \ 2237 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2238 "Decay factor to TenuredGenerationSizeIncrement") \ 2239 range(1, max_uintx) \ 2240 \ 2241 product(uintx, MaxGCPauseMillis, max_uintx, \ 2242 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2243 "or (G1 Only) the maximum GC time per MMU time slice") \ 2244 range(1, max_uintx) \ 2245 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \ 2246 \ 2247 product(uintx, GCPauseIntervalMillis, 0, \ 2248 "Time slice for MMU specification") \ 2249 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \ 2250 \ 2251 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2252 "Adaptive size policy maximum GC minor pause time goal " \ 2253 "in millisecond") \ 2254 \ 2255 product(uintx, GCTimeRatio, 99, \ 2256 "Adaptive size policy application time to GC time ratio") \ 2257 \ 2258 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2259 "Adaptive size scale down factor for shrinking") \ 2260 range(1, max_uintx) \ 2261 \ 2262 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2263 "Adaptive size decays the major cost for long major intervals") \ 2264 \ 2265 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2266 "Time scale over which major costs decay") \ 2267 \ 2268 product(uintx, MinSurvivorRatio, 3, \ 2269 "Minimum ratio of young generation/survivor space size") \ 2270 range(3, max_uintx) \ 2271 \ 2272 product(uintx, InitialSurvivorRatio, 8, \ 2273 "Initial ratio of young generation/survivor space size") \ 2274 \ 2275 product(size_t, BaseFootPrintEstimate, 256*M, \ 2276 "Estimate of footprint other than Java Heap") \ 2277 \ 2278 product(bool, UseGCOverheadLimit, true, \ 2279 "Use policy to limit of proportion of time spent in GC " \ 2280 "before an OutOfMemory error is thrown") \ 2281 \ 2282 product(uintx, GCTimeLimit, 98, \ 2283 "Limit of the proportion of time spent in GC before " \ 2284 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2285 range(0, 100) \ 2286 \ 2287 product(uintx, GCHeapFreeLimit, 2, \ 2288 "Minimum percentage of free space after a full GC before an " \ 2289 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2290 range(0, 100) \ 2291 \ 2292 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2293 "Number of consecutive collections before gc time limit fires") \ 2294 range(1, max_uintx) \ 2295 \ 2296 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2297 "How far ahead to prefetch destination area (<= 0 means off)") \ 2298 \ 2299 product(intx, PrefetchScanIntervalInBytes, -1, \ 2300 "How far ahead to prefetch scan area (<= 0 means off)") \ 2301 \ 2302 product(intx, PrefetchFieldsAhead, -1, \ 2303 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2304 \ 2305 diagnostic(bool, VerifyDuringStartup, false, \ 2306 "Verify memory system before executing any Java code " \ 2307 "during VM initialization") \ 2308 \ 2309 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2310 "Verify system before exiting") \ 2311 \ 2312 diagnostic(bool, VerifyBeforeGC, false, \ 2313 "Verify memory system before GC") \ 2314 \ 2315 diagnostic(bool, VerifyAfterGC, false, \ 2316 "Verify memory system after GC") \ 2317 \ 2318 diagnostic(bool, VerifyDuringGC, false, \ 2319 "Verify memory system during GC (between phases)") \ 2320 \ 2321 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2322 "Enable parallel memory system verification") \ 2323 \ 2324 diagnostic(bool, DeferInitialCardMark, false, \ 2325 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2326 "may arise from new_pre_store_barrier") \ 2327 \ 2328 product(bool, UseCondCardMark, false, \ 2329 "Check for already marked card before updating card table") \ 2330 \ 2331 diagnostic(bool, VerifyRememberedSets, false, \ 2332 "Verify GC remembered sets") \ 2333 \ 2334 diagnostic(bool, VerifyObjectStartArray, true, \ 2335 "Verify GC object start array if verify before/after") \ 2336 \ 2337 product(bool, DisableExplicitGC, false, \ 2338 "Ignore calls to System.gc()") \ 2339 \ 2340 notproduct(bool, CheckMemoryInitialization, false, \ 2341 "Check memory initialization") \ 2342 \ 2343 diagnostic(bool, BindCMSThreadToCPU, false, \ 2344 "Bind CMS Thread to CPU if possible") \ 2345 \ 2346 diagnostic(uintx, CPUForCMSThread, 0, \ 2347 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2348 \ 2349 product(bool, BindGCTaskThreadsToCPUs, false, \ 2350 "Bind GCTaskThreads to CPUs if possible") \ 2351 \ 2352 product(bool, UseGCTaskAffinity, false, \ 2353 "Use worker affinity when asking for GCTasks") \ 2354 \ 2355 product(uintx, ProcessDistributionStride, 4, \ 2356 "Stride through processors when distributing processes") \ 2357 \ 2358 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2359 "Number of times the coordinator GC thread will sleep while " \ 2360 "yielding before giving up and resuming GC") \ 2361 \ 2362 product(uintx, CMSYieldSleepCount, 0, \ 2363 "Number of times a GC thread (minus the coordinator) " \ 2364 "will sleep while yielding before giving up and resuming GC") \ 2365 \ 2366 develop(intx, ConcGCYieldTimeout, 0, \ 2367 "If non-zero, assert that GC threads yield within this " \ 2368 "number of milliseconds") \ 2369 range(0, max_intx) \ 2370 \ 2371 develop(bool, TraceFinalizerRegistration, false, \ 2372 "Trace registration of final references") \ 2373 \ 2374 notproduct(bool, TraceScavenge, false, \ 2375 "Trace scavenge") \ 2376 \ 2377 product(bool, IgnoreEmptyClassPaths, false, \ 2378 "Ignore empty path elements in -classpath") \ 2379 \ 2380 product(bool, TraceClassPaths, false, \ 2381 "Trace processing of class paths") \ 2382 \ 2383 product_rw(bool, TraceClassLoading, false, \ 2384 "Trace all classes loaded") \ 2385 \ 2386 product(bool, TraceClassLoadingPreorder, false, \ 2387 "Trace all classes loaded in order referenced (not loaded)") \ 2388 \ 2389 product_rw(bool, TraceClassUnloading, false, \ 2390 "Trace unloading of classes") \ 2391 \ 2392 product_rw(bool, TraceLoaderConstraints, false, \ 2393 "Trace loader constraints") \ 2394 \ 2395 develop(bool, TraceClassLoaderData, false, \ 2396 "Trace class loader loader_data lifetime") \ 2397 \ 2398 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2399 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2400 "Initial size of the boot class loader data metaspace") \ 2401 range(30*K, max_uintx/BytesPerWord) \ 2402 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2403 \ 2404 product(bool, TraceYoungGenTime, false, \ 2405 "Trace accumulated time for young collection") \ 2406 \ 2407 product(bool, TraceOldGenTime, false, \ 2408 "Trace accumulated time for old collection") \ 2409 \ 2410 product(bool, PrintHeapAtSIGBREAK, true, \ 2411 "Print heap layout in response to SIGBREAK") \ 2412 \ 2413 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2414 "Print a class histogram after any major stop-world GC") \ 2415 \ 2416 manageable(bool, PrintClassHistogram, false, \ 2417 "Print a histogram of class instances") \ 2418 \ 2419 develop(bool, TraceWorkGang, false, \ 2420 "Trace activities of work gangs") \ 2421 \ 2422 develop(bool, TraceGCTaskManager, false, \ 2423 "Trace actions of the GC task manager") \ 2424 \ 2425 develop(bool, TraceGCTaskQueue, false, \ 2426 "Trace actions of the GC task queues") \ 2427 \ 2428 diagnostic(bool, TraceGCTaskThread, false, \ 2429 "Trace actions of the GC task threads") \ 2430 \ 2431 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2432 "Trace marking phase in ParallelOldGC") \ 2433 \ 2434 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2435 "Trace dense prefix computation for ParallelOldGC") \ 2436 \ 2437 develop(bool, IgnoreLibthreadGPFault, false, \ 2438 "Suppress workaround for libthread GP fault") \ 2439 \ 2440 product(bool, PrintJNIGCStalls, false, \ 2441 "Print diagnostic message when GC is stalled " \ 2442 "by JNI critical section") \ 2443 \ 2444 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2445 "The percentage of the used heap that the instances of a class " \ 2446 "must occupy for the class to generate a trace event") \ 2447 range(0.0, 100.0) \ 2448 \ 2449 /* JVMTI heap profiling */ \ 2450 \ 2451 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2452 "Trace JVMTI object tagging calls") \ 2453 \ 2454 diagnostic(bool, VerifyBeforeIteration, false, \ 2455 "Verify memory system before JVMTI iteration") \ 2456 \ 2457 /* compiler interface */ \ 2458 \ 2459 develop(bool, CIPrintCompilerName, false, \ 2460 "when CIPrint is active, print the name of the active compiler") \ 2461 \ 2462 diagnostic(bool, CIPrintCompileQueue, false, \ 2463 "display the contents of the compile queue whenever a " \ 2464 "compilation is enqueued") \ 2465 \ 2466 develop(bool, CIPrintRequests, false, \ 2467 "display every request for compilation") \ 2468 \ 2469 product(bool, CITime, false, \ 2470 "collect timing information for compilation") \ 2471 \ 2472 develop(bool, CITimeVerbose, false, \ 2473 "be more verbose in compilation timings") \ 2474 \ 2475 develop(bool, CITimeEach, false, \ 2476 "display timing information after each successful compilation") \ 2477 \ 2478 develop(bool, CICountOSR, false, \ 2479 "use a separate counter when assigning ids to osr compilations") \ 2480 \ 2481 develop(bool, CICompileNatives, true, \ 2482 "compile native methods if supported by the compiler") \ 2483 \ 2484 develop_pd(bool, CICompileOSR, \ 2485 "compile on stack replacement methods if supported by the " \ 2486 "compiler") \ 2487 \ 2488 develop(bool, CIPrintMethodCodes, false, \ 2489 "print method bytecodes of the compiled code") \ 2490 \ 2491 develop(bool, CIPrintTypeFlow, false, \ 2492 "print the results of ciTypeFlow analysis") \ 2493 \ 2494 develop(bool, CITraceTypeFlow, false, \ 2495 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2496 \ 2497 develop(intx, OSROnlyBCI, -1, \ 2498 "OSR only at this bci. Negative values mean exclude that bci") \ 2499 \ 2500 /* compiler */ \ 2501 \ 2502 /* notice: the max range value here is max_jint, not max_intx */ \ 2503 /* because of overflow issue */ \ 2504 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2505 "Number of compiler threads to run") \ 2506 range(0, max_jint) \ 2507 constraint(CICompilerCountConstraintFunc, AtParse) \ 2508 \ 2509 product(intx, CompilationPolicyChoice, 0, \ 2510 "which compilation policy (0-3)") \ 2511 range(0, 3) \ 2512 \ 2513 develop(bool, UseStackBanging, true, \ 2514 "use stack banging for stack overflow checks (required for " \ 2515 "proper StackOverflow handling; disable only to measure cost " \ 2516 "of stackbanging)") \ 2517 \ 2518 develop(bool, UseStrictFP, true, \ 2519 "use strict fp if modifier strictfp is set") \ 2520 \ 2521 develop(bool, GenerateSynchronizationCode, true, \ 2522 "generate locking/unlocking code for synchronized methods and " \ 2523 "monitors") \ 2524 \ 2525 develop(bool, GenerateCompilerNullChecks, true, \ 2526 "Generate explicit null checks for loads/stores/calls") \ 2527 \ 2528 develop(bool, GenerateRangeChecks, true, \ 2529 "Generate range checks for array accesses") \ 2530 \ 2531 develop_pd(bool, ImplicitNullChecks, \ 2532 "Generate code for implicit null checks") \ 2533 \ 2534 product_pd(bool, TrapBasedNullChecks, \ 2535 "Generate code for null checks that uses a cmp and trap " \ 2536 "instruction raising SIGTRAP. This is only used if an access to" \ 2537 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2538 "ImplicitNullChecks don't work (PPC64).") \ 2539 \ 2540 product(bool, PrintSafepointStatistics, false, \ 2541 "Print statistics about safepoint synchronization") \ 2542 \ 2543 product(intx, PrintSafepointStatisticsCount, 300, \ 2544 "Total number of safepoint statistics collected " \ 2545 "before printing them out") \ 2546 range(1, max_intx) \ 2547 \ 2548 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2549 "Print safepoint statistics only when safepoint takes " \ 2550 "more than PrintSafepointSatisticsTimeout in millis") \ 2551 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2552 NOT_LP64(range(-1, max_intx)) \ 2553 \ 2554 product(bool, TraceSafepointCleanupTime, false, \ 2555 "Print the break down of clean up tasks performed during " \ 2556 "safepoint") \ 2557 \ 2558 product(bool, Inline, true, \ 2559 "Enable inlining") \ 2560 \ 2561 product(bool, ClipInlining, true, \ 2562 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2563 \ 2564 develop(bool, UseCHA, true, \ 2565 "Enable CHA") \ 2566 \ 2567 product(bool, UseTypeProfile, true, \ 2568 "Check interpreter profile for historically monomorphic calls") \ 2569 \ 2570 diagnostic(bool, PrintInlining, false, \ 2571 "Print inlining optimizations") \ 2572 \ 2573 product(bool, UsePopCountInstruction, false, \ 2574 "Use population count instruction") \ 2575 \ 2576 develop(bool, EagerInitialization, false, \ 2577 "Eagerly initialize classes if possible") \ 2578 \ 2579 diagnostic(bool, LogTouchedMethods, false, \ 2580 "Log methods which have been ever touched in runtime") \ 2581 \ 2582 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2583 "Print all methods that have been ever touched in runtime") \ 2584 \ 2585 develop(bool, TraceMethodReplacement, false, \ 2586 "Print when methods are replaced do to recompilation") \ 2587 \ 2588 develop(bool, PrintMethodFlushing, false, \ 2589 "Print the nmethods being flushed") \ 2590 \ 2591 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2592 "print statistics about method flushing") \ 2593 \ 2594 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2595 "Number of compiled code invocations after which " \ 2596 "the method is considered as hot by the flusher") \ 2597 range(1, max_jint) \ 2598 \ 2599 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2600 "Minimum number of sweeper passes before an nmethod " \ 2601 "can be flushed") \ 2602 range(0, max_intx) \ 2603 \ 2604 product(bool, UseCodeAging, true, \ 2605 "Insert counter to detect warm methods") \ 2606 \ 2607 diagnostic(bool, StressCodeAging, false, \ 2608 "Start with counters compiled in") \ 2609 \ 2610 develop(bool, UseRelocIndex, false, \ 2611 "Use an index to speed random access to relocations") \ 2612 \ 2613 develop(bool, StressCodeBuffers, false, \ 2614 "Exercise code buffer expansion and other rare state changes") \ 2615 \ 2616 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2617 "Generate extra debugging information for non-safepoints in " \ 2618 "nmethods") \ 2619 \ 2620 product(bool, PrintVMOptions, false, \ 2621 "Print flags that appeared on the command line") \ 2622 \ 2623 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2624 "Ignore unrecognized VM options") \ 2625 \ 2626 product(bool, PrintCommandLineFlags, false, \ 2627 "Print flags specified on command line or set by ergonomics") \ 2628 \ 2629 product(bool, PrintFlagsInitial, false, \ 2630 "Print all VM flags before argument processing and exit VM") \ 2631 \ 2632 product(bool, PrintFlagsFinal, false, \ 2633 "Print all VM flags after argument and ergonomic processing") \ 2634 \ 2635 notproduct(bool, PrintFlagsWithComments, false, \ 2636 "Print all VM flags with default values and descriptions and " \ 2637 "exit") \ 2638 \ 2639 product(bool, PrintFlagsRanges, false, \ 2640 "Print VM flags and their ranges and exit VM") \ 2641 \ 2642 diagnostic(bool, SerializeVMOutput, true, \ 2643 "Use a mutex to serialize output to tty and LogFile") \ 2644 \ 2645 diagnostic(bool, DisplayVMOutput, true, \ 2646 "Display all VM output on the tty, independently of LogVMOutput") \ 2647 \ 2648 diagnostic(bool, LogVMOutput, false, \ 2649 "Save VM output to LogFile") \ 2650 \ 2651 diagnostic(ccstr, LogFile, NULL, \ 2652 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2653 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2654 \ 2655 product(ccstr, ErrorFile, NULL, \ 2656 "If an error occurs, save the error data to this file " \ 2657 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2658 \ 2659 product(bool, DisplayVMOutputToStderr, false, \ 2660 "If DisplayVMOutput is true, display all VM output to stderr") \ 2661 \ 2662 product(bool, DisplayVMOutputToStdout, false, \ 2663 "If DisplayVMOutput is true, display all VM output to stdout") \ 2664 \ 2665 product(bool, UseHeavyMonitors, false, \ 2666 "use heavyweight instead of lightweight Java monitors") \ 2667 \ 2668 product(bool, PrintStringTableStatistics, false, \ 2669 "print statistics about the StringTable and SymbolTable") \ 2670 \ 2671 diagnostic(bool, VerifyStringTableAtExit, false, \ 2672 "verify StringTable contents at exit") \ 2673 \ 2674 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2675 "print histogram of the symbol table") \ 2676 \ 2677 notproduct(bool, ExitVMOnVerifyError, false, \ 2678 "standard exit from VM if bytecode verify error " \ 2679 "(only in debug mode)") \ 2680 \ 2681 diagnostic(ccstr, AbortVMOnException, NULL, \ 2682 "Call fatal if this exception is thrown. Example: " \ 2683 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2684 \ 2685 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2686 "Call fatal if the exception pointed by AbortVMOnException " \ 2687 "has this message") \ 2688 \ 2689 develop(bool, DebugVtables, false, \ 2690 "add debugging code to vtable dispatch") \ 2691 \ 2692 develop(bool, PrintVtables, false, \ 2693 "print vtables when printing klass") \ 2694 \ 2695 notproduct(bool, PrintVtableStats, false, \ 2696 "print vtables stats at end of run") \ 2697 \ 2698 develop(bool, TraceCreateZombies, false, \ 2699 "trace creation of zombie nmethods") \ 2700 \ 2701 notproduct(bool, IgnoreLockingAssertions, false, \ 2702 "disable locking assertions (for speed)") \ 2703 \ 2704 product(bool, RangeCheckElimination, true, \ 2705 "Eliminate range checks") \ 2706 \ 2707 develop_pd(bool, UncommonNullCast, \ 2708 "track occurrences of null in casts; adjust compiler tactics") \ 2709 \ 2710 develop(bool, TypeProfileCasts, true, \ 2711 "treat casts like calls for purposes of type profiling") \ 2712 \ 2713 develop(bool, DelayCompilationDuringStartup, true, \ 2714 "Delay invoking the compiler until main application class is " \ 2715 "loaded") \ 2716 \ 2717 develop(bool, CompileTheWorld, false, \ 2718 "Compile all methods in all classes in bootstrap class path " \ 2719 "(stress test)") \ 2720 \ 2721 develop(bool, CompileTheWorldPreloadClasses, true, \ 2722 "Preload all classes used by a class before start loading") \ 2723 \ 2724 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2725 "Force a safepoint every n compiles so sweeper can keep up") \ 2726 \ 2727 develop(bool, FillDelaySlots, true, \ 2728 "Fill delay slots (on SPARC only)") \ 2729 \ 2730 develop(bool, TimeLivenessAnalysis, false, \ 2731 "Time computation of bytecode liveness analysis") \ 2732 \ 2733 develop(bool, TraceLivenessGen, false, \ 2734 "Trace the generation of liveness analysis information") \ 2735 \ 2736 notproduct(bool, TraceLivenessQuery, false, \ 2737 "Trace queries of liveness analysis information") \ 2738 \ 2739 notproduct(bool, CollectIndexSetStatistics, false, \ 2740 "Collect information about IndexSets") \ 2741 \ 2742 develop(bool, UseLoopSafepoints, true, \ 2743 "Generate Safepoint nodes in every loop") \ 2744 \ 2745 develop(intx, FastAllocateSizeLimit, 128*K, \ 2746 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2747 "Inline allocations larger than this in doublewords must go slow")\ 2748 \ 2749 product(bool, AggressiveOpts, false, \ 2750 "Enable aggressive optimizations - see arguments.cpp") \ 2751 \ 2752 product_pd(bool, CompactStrings, \ 2753 "Enable Strings to use single byte chars in backing store") \ 2754 \ 2755 product_pd(uintx, TypeProfileLevel, \ 2756 "=XYZ, with Z: Type profiling of arguments at call; " \ 2757 "Y: Type profiling of return value at call; " \ 2758 "X: Type profiling of parameters to methods; " \ 2759 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2760 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2761 \ 2762 product(intx, TypeProfileArgsLimit, 2, \ 2763 "max number of call arguments to consider for type profiling") \ 2764 range(0, 16) \ 2765 \ 2766 product(intx, TypeProfileParmsLimit, 2, \ 2767 "max number of incoming parameters to consider for type profiling"\ 2768 ", -1 for all") \ 2769 range(-1, 64) \ 2770 \ 2771 /* statistics */ \ 2772 develop(bool, CountCompiledCalls, false, \ 2773 "Count method invocations") \ 2774 \ 2775 notproduct(bool, CountRuntimeCalls, false, \ 2776 "Count VM runtime calls") \ 2777 \ 2778 develop(bool, CountJNICalls, false, \ 2779 "Count jni method invocations") \ 2780 \ 2781 notproduct(bool, CountJVMCalls, false, \ 2782 "Count jvm method invocations") \ 2783 \ 2784 notproduct(bool, CountRemovableExceptions, false, \ 2785 "Count exceptions that could be replaced by branches due to " \ 2786 "inlining") \ 2787 \ 2788 notproduct(bool, ICMissHistogram, false, \ 2789 "Produce histogram of IC misses") \ 2790 \ 2791 /* interpreter */ \ 2792 develop(bool, ClearInterpreterLocals, false, \ 2793 "Always clear local variables of interpreter activations upon " \ 2794 "entry") \ 2795 \ 2796 product_pd(bool, RewriteBytecodes, \ 2797 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2798 \ 2799 product_pd(bool, RewriteFrequentPairs, \ 2800 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2801 \ 2802 diagnostic(bool, PrintInterpreter, false, \ 2803 "Print the generated interpreter code") \ 2804 \ 2805 product(bool, UseInterpreter, true, \ 2806 "Use interpreter for non-compiled methods") \ 2807 \ 2808 develop(bool, UseFastSignatureHandlers, true, \ 2809 "Use fast signature handlers for native calls") \ 2810 \ 2811 product(bool, UseLoopCounter, true, \ 2812 "Increment invocation counter on backward branch") \ 2813 \ 2814 product_pd(bool, UseOnStackReplacement, \ 2815 "Use on stack replacement, calls runtime if invoc. counter " \ 2816 "overflows in loop") \ 2817 \ 2818 notproduct(bool, TraceOnStackReplacement, false, \ 2819 "Trace on stack replacement") \ 2820 \ 2821 product_pd(bool, PreferInterpreterNativeStubs, \ 2822 "Use always interpreter stubs for native methods invoked via " \ 2823 "interpreter") \ 2824 \ 2825 develop(bool, CountBytecodes, false, \ 2826 "Count number of bytecodes executed") \ 2827 \ 2828 develop(bool, PrintBytecodeHistogram, false, \ 2829 "Print histogram of the executed bytecodes") \ 2830 \ 2831 develop(bool, PrintBytecodePairHistogram, false, \ 2832 "Print histogram of the executed bytecode pairs") \ 2833 \ 2834 diagnostic(bool, PrintSignatureHandlers, false, \ 2835 "Print code generated for native method signature handlers") \ 2836 \ 2837 develop(bool, VerifyOops, false, \ 2838 "Do plausibility checks for oops") \ 2839 \ 2840 develop(bool, CheckUnhandledOops, false, \ 2841 "Check for unhandled oops in VM code") \ 2842 \ 2843 develop(bool, VerifyJNIFields, trueInDebug, \ 2844 "Verify jfieldIDs for instance fields") \ 2845 \ 2846 notproduct(bool, VerifyJNIEnvThread, false, \ 2847 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2848 "from JNI") \ 2849 \ 2850 develop(bool, VerifyFPU, false, \ 2851 "Verify FPU state (check for NaN's, etc.)") \ 2852 \ 2853 develop(bool, VerifyThread, false, \ 2854 "Watch the thread register for corruption (SPARC only)") \ 2855 \ 2856 develop(bool, VerifyActivationFrameSize, false, \ 2857 "Verify that activation frame didn't become smaller than its " \ 2858 "minimal size") \ 2859 \ 2860 develop(bool, TraceFrequencyInlining, false, \ 2861 "Trace frequency based inlining") \ 2862 \ 2863 develop_pd(bool, InlineIntrinsics, \ 2864 "Inline intrinsics that can be statically resolved") \ 2865 \ 2866 product_pd(bool, ProfileInterpreter, \ 2867 "Profile at the bytecode level during interpretation") \ 2868 \ 2869 develop(bool, TraceProfileInterpreter, false, \ 2870 "Trace profiling at the bytecode level during interpretation. " \ 2871 "This outputs the profiling information collected to improve " \ 2872 "jit compilation.") \ 2873 \ 2874 develop_pd(bool, ProfileTraps, \ 2875 "Profile deoptimization traps at the bytecode level") \ 2876 \ 2877 product(intx, ProfileMaturityPercentage, 20, \ 2878 "number of method invocations/branches (expressed as % of " \ 2879 "CompileThreshold) before using the method's profile") \ 2880 range(0, 100) \ 2881 \ 2882 diagnostic(bool, PrintMethodData, false, \ 2883 "Print the results of +ProfileInterpreter at end of run") \ 2884 \ 2885 develop(bool, VerifyDataPointer, trueInDebug, \ 2886 "Verify the method data pointer during interpreter profiling") \ 2887 \ 2888 develop(bool, VerifyCompiledCode, false, \ 2889 "Include miscellaneous runtime verifications in nmethod code; " \ 2890 "default off because it disturbs nmethod size heuristics") \ 2891 \ 2892 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2893 "Manually make GC thread crash then dump java stack trace; " \ 2894 "Test only") \ 2895 \ 2896 /* compilation */ \ 2897 product(bool, UseCompiler, true, \ 2898 "Use Just-In-Time compilation") \ 2899 \ 2900 develop(bool, TraceCompilationPolicy, false, \ 2901 "Trace compilation policy") \ 2902 \ 2903 develop(bool, TimeCompilationPolicy, false, \ 2904 "Time the compilation policy") \ 2905 \ 2906 product(bool, UseCounterDecay, true, \ 2907 "Adjust recompilation counters") \ 2908 \ 2909 develop(intx, CounterHalfLifeTime, 30, \ 2910 "Half-life time of invocation counters (in seconds)") \ 2911 \ 2912 develop(intx, CounterDecayMinIntervalLength, 500, \ 2913 "The minimum interval (in milliseconds) between invocation of " \ 2914 "CounterDecay") \ 2915 \ 2916 product(bool, AlwaysCompileLoopMethods, false, \ 2917 "When using recompilation, never interpret methods " \ 2918 "containing loops") \ 2919 \ 2920 product(bool, DontCompileHugeMethods, true, \ 2921 "Do not compile methods > HugeMethodLimit") \ 2922 \ 2923 /* Bytecode escape analysis estimation. */ \ 2924 product(bool, EstimateArgEscape, true, \ 2925 "Analyze bytecodes to estimate escape state of arguments") \ 2926 \ 2927 product(intx, BCEATraceLevel, 0, \ 2928 "How much tracing to do of bytecode escape analysis estimates " \ 2929 "(0-3)") \ 2930 range(0, 3) \ 2931 \ 2932 product(intx, MaxBCEAEstimateLevel, 5, \ 2933 "Maximum number of nested calls that are analyzed by BC EA") \ 2934 range(0, max_jint) \ 2935 \ 2936 product(intx, MaxBCEAEstimateSize, 150, \ 2937 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2938 range(0, max_jint) \ 2939 \ 2940 product(intx, AllocatePrefetchStyle, 1, \ 2941 "0 = no prefetch, " \ 2942 "1 = prefetch instructions for each allocation, " \ 2943 "2 = use TLAB watermark to gate allocation prefetch, " \ 2944 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2945 range(0, 3) \ 2946 \ 2947 product(intx, AllocatePrefetchDistance, -1, \ 2948 "Distance to prefetch ahead of allocation pointer. " \ 2949 "-1: use system-specific value (automatically determined") \ 2950 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2951 \ 2952 product(intx, AllocatePrefetchLines, 3, \ 2953 "Number of lines to prefetch ahead of array allocation pointer") \ 2954 range(1, max_jint / 2) \ 2955 \ 2956 product(intx, AllocateInstancePrefetchLines, 1, \ 2957 "Number of lines to prefetch ahead of instance allocation " \ 2958 "pointer") \ 2959 range(1, max_jint / 2) \ 2960 \ 2961 product(intx, AllocatePrefetchStepSize, 16, \ 2962 "Step size in bytes of sequential prefetch instructions") \ 2963 range(1, max_jint) \ 2964 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2965 \ 2966 product(intx, AllocatePrefetchInstr, 0, \ 2967 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2968 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \ 2969 \ 2970 /* deoptimization */ \ 2971 develop(bool, TraceDeoptimization, false, \ 2972 "Trace deoptimization") \ 2973 \ 2974 develop(bool, PrintDeoptimizationDetails, false, \ 2975 "Print more information about deoptimization") \ 2976 \ 2977 develop(bool, DebugDeoptimization, false, \ 2978 "Tracing various information while debugging deoptimization") \ 2979 \ 2980 product(intx, SelfDestructTimer, 0, \ 2981 "Will cause VM to terminate after a given time (in minutes) " \ 2982 "(0 means off)") \ 2983 range(0, max_intx) \ 2984 \ 2985 product(intx, MaxJavaStackTraceDepth, 1024, \ 2986 "The maximum number of lines in the stack trace for Java " \ 2987 "exceptions (0 means all)") \ 2988 range(0, max_jint/2) \ 2989 \ 2990 /* notice: the max range value here is max_jint, not max_intx */ \ 2991 /* because of overflow issue */ \ 2992 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2993 "Guarantee a safepoint (at least) every so many milliseconds " \ 2994 "(0 means none)")) \ 2995 NOT_EMBEDDED(range(0, max_jint)) \ 2996 \ 2997 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2998 "Guarantee a safepoint (at least) every so many milliseconds " \ 2999 "(0 means none)")) \ 3000 EMBEDDED_ONLY(range(0, max_jint)) \ 3001 \ 3002 product(intx, SafepointTimeoutDelay, 10000, \ 3003 "Delay in milliseconds for option SafepointTimeout") \ 3004 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 3005 NOT_LP64(range(0, max_intx)) \ 3006 \ 3007 product(intx, NmethodSweepActivity, 10, \ 3008 "Removes cold nmethods from code cache if > 0. Higher values " \ 3009 "result in more aggressive sweeping") \ 3010 range(0, 2000) \ 3011 \ 3012 notproduct(bool, LogSweeper, false, \ 3013 "Keep a ring buffer of sweeper activity") \ 3014 \ 3015 notproduct(intx, SweeperLogEntries, 1024, \ 3016 "Number of records in the ring buffer of sweeper activity") \ 3017 \ 3018 notproduct(intx, MemProfilingInterval, 500, \ 3019 "Time between each invocation of the MemProfiler") \ 3020 \ 3021 develop(intx, MallocCatchPtr, -1, \ 3022 "Hit breakpoint when mallocing/freeing this pointer") \ 3023 \ 3024 notproduct(ccstrlist, SuppressErrorAt, "", \ 3025 "List of assertions (file:line) to muzzle") \ 3026 \ 3027 notproduct(size_t, HandleAllocationLimit, 1024, \ 3028 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3029 "is used") \ 3030 \ 3031 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3032 "Threshold for total handle allocation when " \ 3033 "+TraceHandleAllocation is used") \ 3034 \ 3035 develop(intx, StackPrintLimit, 100, \ 3036 "number of stack frames to print in VM-level stack dump") \ 3037 \ 3038 notproduct(intx, MaxElementPrintSize, 256, \ 3039 "maximum number of elements to print") \ 3040 \ 3041 notproduct(intx, MaxSubklassPrintSize, 4, \ 3042 "maximum number of subklasses to print when printing klass") \ 3043 \ 3044 product(intx, MaxInlineLevel, 9, \ 3045 "maximum number of nested calls that are inlined") \ 3046 range(0, max_jint) \ 3047 \ 3048 product(intx, MaxRecursiveInlineLevel, 1, \ 3049 "maximum number of nested recursive calls that are inlined") \ 3050 range(0, max_jint) \ 3051 \ 3052 develop(intx, MaxForceInlineLevel, 100, \ 3053 "maximum number of nested calls that are forced for inlining " \ 3054 "(using CompileCommand or marked w/ @ForceInline)") \ 3055 range(0, max_jint) \ 3056 \ 3057 product_pd(intx, InlineSmallCode, \ 3058 "Only inline already compiled methods if their code size is " \ 3059 "less than this") \ 3060 range(0, max_jint) \ 3061 \ 3062 product(intx, MaxInlineSize, 35, \ 3063 "The maximum bytecode size of a method to be inlined") \ 3064 range(0, max_jint) \ 3065 \ 3066 product_pd(intx, FreqInlineSize, \ 3067 "The maximum bytecode size of a frequent method to be inlined") \ 3068 range(0, max_jint) \ 3069 \ 3070 product(intx, MaxTrivialSize, 6, \ 3071 "The maximum bytecode size of a trivial method to be inlined") \ 3072 range(0, max_jint) \ 3073 \ 3074 product(intx, MinInliningThreshold, 250, \ 3075 "The minimum invocation count a method needs to have to be " \ 3076 "inlined") \ 3077 range(0, max_jint) \ 3078 \ 3079 develop(intx, MethodHistogramCutoff, 100, \ 3080 "The cutoff value for method invocation histogram (+CountCalls)") \ 3081 \ 3082 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3083 "Number of interpreted methods to show in profile") \ 3084 \ 3085 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3086 "Number of compiled methods to show in profile") \ 3087 \ 3088 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3089 "Number of stub methods to show in profile") \ 3090 \ 3091 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3092 "Number of runtime stub nodes to show in profile") \ 3093 \ 3094 product(intx, ProfileIntervalsTicks, 100, \ 3095 "Number of ticks between printing of interval profile " \ 3096 "(+ProfileIntervals)") \ 3097 range(0, max_intx) \ 3098 \ 3099 notproduct(intx, ScavengeALotInterval, 1, \ 3100 "Interval between which scavenge will occur with +ScavengeALot") \ 3101 \ 3102 notproduct(intx, FullGCALotInterval, 1, \ 3103 "Interval between which full gc will occur with +FullGCALot") \ 3104 \ 3105 notproduct(intx, FullGCALotStart, 0, \ 3106 "For which invocation to start FullGCAlot") \ 3107 \ 3108 notproduct(intx, FullGCALotDummies, 32*K, \ 3109 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3110 "to move") \ 3111 \ 3112 develop(intx, DontYieldALotInterval, 10, \ 3113 "Interval between which yields will be dropped (milliseconds)") \ 3114 \ 3115 develop(intx, MinSleepInterval, 1, \ 3116 "Minimum sleep() interval (milliseconds) when " \ 3117 "ConvertSleepToYield is off (used for Solaris)") \ 3118 \ 3119 develop(intx, ProfilerPCTickThreshold, 15, \ 3120 "Number of ticks in a PC buckets to be a hotspot") \ 3121 \ 3122 notproduct(intx, DeoptimizeALotInterval, 5, \ 3123 "Number of exits until DeoptimizeALot kicks in") \ 3124 \ 3125 notproduct(intx, ZombieALotInterval, 5, \ 3126 "Number of exits until ZombieALot kicks in") \ 3127 \ 3128 diagnostic(intx, MallocVerifyInterval, 0, \ 3129 "If non-zero, verify C heap after every N calls to " \ 3130 "malloc/realloc/free") \ 3131 range(0, max_intx) \ 3132 \ 3133 diagnostic(intx, MallocVerifyStart, 0, \ 3134 "If non-zero, start verifying C heap after Nth call to " \ 3135 "malloc/realloc/free") \ 3136 range(0, max_intx) \ 3137 \ 3138 diagnostic(uintx, MallocMaxTestWords, 0, \ 3139 "If non-zero, maximum number of words that malloc/realloc can " \ 3140 "allocate (for testing only)") \ 3141 range(0, max_uintx) \ 3142 \ 3143 product(intx, TypeProfileWidth, 2, \ 3144 "Number of receiver types to record in call/cast profile") \ 3145 range(0, 8) \ 3146 \ 3147 experimental(intx, MethodProfileWidth, 0, \ 3148 "Number of methods to record in call profile") \ 3149 \ 3150 develop(intx, BciProfileWidth, 2, \ 3151 "Number of return bci's to record in ret profile") \ 3152 \ 3153 product(intx, PerMethodRecompilationCutoff, 400, \ 3154 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3155 range(-1, max_intx) \ 3156 \ 3157 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3158 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3159 range(-1, max_intx) \ 3160 \ 3161 product(intx, PerMethodTrapLimit, 100, \ 3162 "Limit on traps (of one kind) in a method (includes inlines)") \ 3163 range(0, max_jint) \ 3164 \ 3165 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3166 "Limit on speculative traps (of one kind) in a method " \ 3167 "(includes inlines)") \ 3168 range(0, max_jint) \ 3169 \ 3170 product(intx, PerBytecodeTrapLimit, 4, \ 3171 "Limit on traps (of one kind) at a particular BCI") \ 3172 range(0, max_jint) \ 3173 \ 3174 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3175 "Extra method data trap entries for speculation") \ 3176 \ 3177 develop(intx, InlineFrequencyRatio, 20, \ 3178 "Ratio of call site execution to caller method invocation") \ 3179 range(0, max_jint) \ 3180 \ 3181 develop_pd(intx, InlineFrequencyCount, \ 3182 "Count of call site execution necessary to trigger frequent " \ 3183 "inlining") \ 3184 range(0, max_jint) \ 3185 \ 3186 develop(intx, InlineThrowCount, 50, \ 3187 "Force inlining of interpreted methods that throw this often") \ 3188 range(0, max_jint) \ 3189 \ 3190 develop(intx, InlineThrowMaxSize, 200, \ 3191 "Force inlining of throwing methods smaller than this") \ 3192 range(0, max_jint) \ 3193 \ 3194 develop(intx, ProfilerNodeSize, 1024, \ 3195 "Size in K to allocate for the Profile Nodes of each thread") \ 3196 range(0, 1024) \ 3197 \ 3198 /* gc parameters */ \ 3199 product(size_t, InitialHeapSize, 0, \ 3200 "Initial heap size (in bytes); zero means use ergonomics") \ 3201 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3202 \ 3203 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3204 "Maximum heap size (in bytes)") \ 3205 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3206 \ 3207 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3208 "Initial tenured generation size (in bytes)") \ 3209 \ 3210 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3211 "Initial new generation size (in bytes)") \ 3212 constraint(NewSizeConstraintFunc,AfterErgo) \ 3213 \ 3214 product(size_t, MaxNewSize, max_uintx, \ 3215 "Maximum new generation size (in bytes), max_uintx means set " \ 3216 "ergonomically") \ 3217 \ 3218 product(size_t, PretenureSizeThreshold, 0, \ 3219 "Maximum size in bytes of objects allocated in DefNew " \ 3220 "generation; zero means no maximum") \ 3221 \ 3222 product(size_t, MinTLABSize, 2*K, \ 3223 "Minimum allowed TLAB size (in bytes)") \ 3224 range(1, max_uintx) \ 3225 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3226 \ 3227 product(size_t, TLABSize, 0, \ 3228 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3229 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3230 \ 3231 product(size_t, YoungPLABSize, 4096, \ 3232 "Size of young gen promotion LAB's (in HeapWords)") \ 3233 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3234 \ 3235 product(size_t, OldPLABSize, 1024, \ 3236 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3237 "of blocks to attempt to claim when refilling CMS LAB's") \ 3238 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3239 \ 3240 product(uintx, TLABAllocationWeight, 35, \ 3241 "Allocation averaging weight") \ 3242 range(0, 100) \ 3243 \ 3244 /* Limit the lower bound of this flag to 1 as it is used */ \ 3245 /* in a division expression. */ \ 3246 product(uintx, TLABWasteTargetPercent, 1, \ 3247 "Percentage of Eden that can be wasted") \ 3248 range(1, 100) \ 3249 \ 3250 product(uintx, TLABRefillWasteFraction, 64, \ 3251 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3252 range(1, max_uintx) \ 3253 \ 3254 product(uintx, TLABWasteIncrement, 4, \ 3255 "Increment allowed waste at slow allocation") \ 3256 \ 3257 product(uintx, SurvivorRatio, 8, \ 3258 "Ratio of eden/survivor space size") \ 3259 range(1, max_uintx-2) \ 3260 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3261 \ 3262 product(uintx, NewRatio, 2, \ 3263 "Ratio of old/new generation sizes") \ 3264 range(0, max_uintx-1) \ 3265 \ 3266 product_pd(size_t, NewSizeThreadIncrease, \ 3267 "Additional size added to desired new generation size per " \ 3268 "non-daemon thread (in bytes)") \ 3269 \ 3270 product_pd(size_t, MetaspaceSize, \ 3271 "Initial size of Metaspaces (in bytes)") \ 3272 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3273 \ 3274 product(size_t, MaxMetaspaceSize, max_uintx, \ 3275 "Maximum size of Metaspaces (in bytes)") \ 3276 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3277 \ 3278 product(size_t, CompressedClassSpaceSize, 1*G, \ 3279 "Maximum size of class area in Metaspace when compressed " \ 3280 "class pointers are used") \ 3281 range(1*M, 3*G) \ 3282 \ 3283 manageable(uintx, MinHeapFreeRatio, 40, \ 3284 "The minimum percentage of heap free after GC to avoid expansion."\ 3285 " For most GCs this applies to the old generation. In G1 and" \ 3286 " ParallelGC it applies to the whole heap.") \ 3287 range(0, 100) \ 3288 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3289 \ 3290 manageable(uintx, MaxHeapFreeRatio, 70, \ 3291 "The maximum percentage of heap free after GC to avoid shrinking."\ 3292 " For most GCs this applies to the old generation. In G1 and" \ 3293 " ParallelGC it applies to the whole heap.") \ 3294 range(0, 100) \ 3295 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3296 \ 3297 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3298 "Number of milliseconds per MB of free space in the heap") \ 3299 range(0, max_intx) \ 3300 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3301 \ 3302 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3303 "The minimum change in heap space due to GC (in bytes)") \ 3304 \ 3305 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3306 "The minimum expansion of Metaspace (in bytes)") \ 3307 \ 3308 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3309 "The maximum percentage of Metaspace free after GC to avoid " \ 3310 "shrinking") \ 3311 range(0, 100) \ 3312 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3313 \ 3314 product(uintx, MinMetaspaceFreeRatio, 40, \ 3315 "The minimum percentage of Metaspace free after GC to avoid " \ 3316 "expansion") \ 3317 range(0, 99) \ 3318 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3319 \ 3320 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3321 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3322 \ 3323 product(uintx, QueuedAllocationWarningCount, 0, \ 3324 "Number of times an allocation that queues behind a GC " \ 3325 "will retry before printing a warning") \ 3326 \ 3327 diagnostic(uintx, VerifyGCStartAt, 0, \ 3328 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3329 \ 3330 diagnostic(intx, VerifyGCLevel, 0, \ 3331 "Generation level at which to start +VerifyBefore/AfterGC") \ 3332 range(0, 1) \ 3333 \ 3334 product(uintx, MaxTenuringThreshold, 15, \ 3335 "Maximum value for tenuring threshold") \ 3336 range(0, markOopDesc::max_age + 1) \ 3337 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3338 \ 3339 product(uintx, InitialTenuringThreshold, 7, \ 3340 "Initial value for tenuring threshold") \ 3341 range(0, markOopDesc::max_age + 1) \ 3342 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3343 \ 3344 product(uintx, TargetSurvivorRatio, 50, \ 3345 "Desired percentage of survivor space used after scavenge") \ 3346 range(0, 100) \ 3347 \ 3348 product(uintx, MarkSweepDeadRatio, 5, \ 3349 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3350 "Serial mark sweep treats this as both the minimum and maximum " \ 3351 "value. " \ 3352 "CMS uses this value only if it falls back to mark sweep. " \ 3353 "Par compact uses a variable scale based on the density of the " \ 3354 "generation and treats this as the maximum value when the heap " \ 3355 "is either completely full or completely empty. Par compact " \ 3356 "also has a smaller default value; see arguments.cpp.") \ 3357 range(0, 100) \ 3358 \ 3359 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3360 "How often should we fully compact the heap (ignoring the dead " \ 3361 "space parameters)") \ 3362 range(1, max_uintx) \ 3363 \ 3364 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3365 "Delay between expansion and allocation (in milliseconds)") \ 3366 \ 3367 develop(uintx, GCWorkerDelayMillis, 0, \ 3368 "Delay in scheduling GC workers (in milliseconds)") \ 3369 \ 3370 product(intx, DeferThrSuspendLoopCount, 4000, \ 3371 "(Unstable) Number of times to iterate in safepoint loop " \ 3372 "before blocking VM threads ") \ 3373 range(-1, max_jint-1) \ 3374 \ 3375 product(intx, DeferPollingPageLoopCount, -1, \ 3376 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3377 "before changing safepoint polling page to RO ") \ 3378 range(-1, max_jint-1) \ 3379 \ 3380 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3381 range(0, max_intx) \ 3382 \ 3383 product(bool, PSChunkLargeArrays, true, \ 3384 "Process large arrays in chunks") \ 3385 \ 3386 product(uintx, GCDrainStackTargetSize, 64, \ 3387 "Number of entries we will try to leave on the stack " \ 3388 "during parallel gc") \ 3389 \ 3390 /* stack parameters */ \ 3391 product_pd(intx, StackYellowPages, \ 3392 "Number of yellow zone (recoverable overflows) pages") \ 3393 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3394 \ 3395 product_pd(intx, StackRedPages, \ 3396 "Number of red zone (unrecoverable overflows) pages") \ 3397 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3398 \ 3399 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3400 product_pd(intx, StackShadowPages, \ 3401 "Number of shadow zone (for overflow checking) pages " \ 3402 "this should exceed the depth of the VM and native call stack") \ 3403 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3404 \ 3405 product_pd(intx, ThreadStackSize, \ 3406 "Thread Stack Size (in Kbytes)") \ 3407 range(0, max_intx-os::vm_page_size()) \ 3408 \ 3409 product_pd(intx, VMThreadStackSize, \ 3410 "Non-Java Thread Stack Size (in Kbytes)") \ 3411 range(0, max_intx/(1 * K)) \ 3412 \ 3413 product_pd(intx, CompilerThreadStackSize, \ 3414 "Compiler Thread Stack Size (in Kbytes)") \ 3415 range(0, max_intx) \ 3416 \ 3417 develop_pd(size_t, JVMInvokeMethodSlack, \ 3418 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3419 \ 3420 /* code cache parameters */ \ 3421 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3422 develop(uintx, CodeCacheSegmentSize, \ 3423 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \ 3424 "Code cache segment size (in bytes) - smallest unit of " \ 3425 "allocation") \ 3426 range(1, 1024) \ 3427 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3428 \ 3429 develop_pd(intx, CodeEntryAlignment, \ 3430 "Code entry alignment for generated code (in bytes)") \ 3431 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3432 \ 3433 product_pd(intx, OptoLoopAlignment, \ 3434 "Align inner loops to zero relative to this modulus") \ 3435 range(1, 16) \ 3436 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3437 \ 3438 product_pd(uintx, InitialCodeCacheSize, \ 3439 "Initial code cache size (in bytes)") \ 3440 range(0, max_uintx) \ 3441 \ 3442 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3443 "Minimum code cache size (in bytes) required to start VM.") \ 3444 range(0, max_uintx) \ 3445 \ 3446 product(bool, SegmentedCodeCache, false, \ 3447 "Use a segmented code cache") \ 3448 \ 3449 product_pd(uintx, ReservedCodeCacheSize, \ 3450 "Reserved code cache size (in bytes) - maximum code cache size") \ 3451 range(0, max_uintx) \ 3452 \ 3453 product_pd(uintx, NonProfiledCodeHeapSize, \ 3454 "Size of code heap with non-profiled methods (in bytes)") \ 3455 range(0, max_uintx) \ 3456 \ 3457 product_pd(uintx, ProfiledCodeHeapSize, \ 3458 "Size of code heap with profiled methods (in bytes)") \ 3459 range(0, max_uintx) \ 3460 \ 3461 product_pd(uintx, NonNMethodCodeHeapSize, \ 3462 "Size of code heap with non-nmethods (in bytes)") \ 3463 range(0, max_uintx) \ 3464 \ 3465 product_pd(uintx, CodeCacheExpansionSize, \ 3466 "Code cache expansion size (in bytes)") \ 3467 range(0, max_uintx) \ 3468 \ 3469 develop_pd(uintx, CodeCacheMinBlockLength, \ 3470 "Minimum number of segments in a code cache block") \ 3471 range(1, 100) \ 3472 \ 3473 notproduct(bool, ExitOnFullCodeCache, false, \ 3474 "Exit the VM if we fill the code cache") \ 3475 \ 3476 product(bool, UseCodeCacheFlushing, true, \ 3477 "Remove cold/old nmethods from the code cache") \ 3478 \ 3479 product(uintx, StartAggressiveSweepingAt, 10, \ 3480 "Start aggressive sweeping if X[%] of the code cache is free." \ 3481 "Segmented code cache: X[%] of the non-profiled heap." \ 3482 "Non-segmented code cache: X[%] of the total code cache") \ 3483 range(0, 100) \ 3484 \ 3485 /* interpreter debugging */ \ 3486 develop(intx, BinarySwitchThreshold, 5, \ 3487 "Minimal number of lookupswitch entries for rewriting to binary " \ 3488 "switch") \ 3489 \ 3490 develop(intx, StopInterpreterAt, 0, \ 3491 "Stop interpreter execution at specified bytecode number") \ 3492 \ 3493 develop(intx, TraceBytecodesAt, 0, \ 3494 "Trace bytecodes starting with specified bytecode number") \ 3495 \ 3496 /* compiler interface */ \ 3497 develop(intx, CIStart, 0, \ 3498 "The id of the first compilation to permit") \ 3499 \ 3500 develop(intx, CIStop, max_jint, \ 3501 "The id of the last compilation to permit") \ 3502 \ 3503 develop(intx, CIStartOSR, 0, \ 3504 "The id of the first osr compilation to permit " \ 3505 "(CICountOSR must be on)") \ 3506 \ 3507 develop(intx, CIStopOSR, max_jint, \ 3508 "The id of the last osr compilation to permit " \ 3509 "(CICountOSR must be on)") \ 3510 \ 3511 develop(intx, CIBreakAtOSR, -1, \ 3512 "The id of osr compilation to break at") \ 3513 \ 3514 develop(intx, CIBreakAt, -1, \ 3515 "The id of compilation to break at") \ 3516 \ 3517 product(ccstrlist, CompileOnly, "", \ 3518 "List of methods (pkg/class.name) to restrict compilation to") \ 3519 \ 3520 product(ccstr, CompileCommandFile, NULL, \ 3521 "Read compiler commands from this file [.hotspot_compiler]") \ 3522 \ 3523 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3524 "Read compiler directives from this file") \ 3525 \ 3526 product(ccstrlist, CompileCommand, "", \ 3527 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3528 \ 3529 develop(bool, ReplayCompiles, false, \ 3530 "Enable replay of compilations from ReplayDataFile") \ 3531 \ 3532 product(ccstr, ReplayDataFile, NULL, \ 3533 "File containing compilation replay information" \ 3534 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3535 \ 3536 product(ccstr, InlineDataFile, NULL, \ 3537 "File containing inlining replay information" \ 3538 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3539 \ 3540 develop(intx, ReplaySuppressInitializers, 2, \ 3541 "Control handling of class initialization during replay: " \ 3542 "0 - don't do anything special; " \ 3543 "1 - treat all class initializers as empty; " \ 3544 "2 - treat class initializers for application classes as empty; " \ 3545 "3 - allow all class initializers to run during bootstrap but " \ 3546 " pretend they are empty after starting replay") \ 3547 range(0, 3) \ 3548 \ 3549 develop(bool, ReplayIgnoreInitErrors, false, \ 3550 "Ignore exceptions thrown during initialization for replay") \ 3551 \ 3552 product(bool, DumpReplayDataOnError, true, \ 3553 "Record replay data for crashing compiler threads") \ 3554 \ 3555 product(bool, CICompilerCountPerCPU, false, \ 3556 "1 compiler thread for log(N CPUs)") \ 3557 \ 3558 develop(intx, CIFireOOMAt, -1, \ 3559 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3560 "(non-negative value throws OOM after this many CI accesses " \ 3561 "in each compile)") \ 3562 notproduct(intx, CICrashAt, -1, \ 3563 "id of compilation to trigger assert in compiler thread for " \ 3564 "the purpose of testing, e.g. generation of replay data") \ 3565 notproduct(bool, CIObjectFactoryVerify, false, \ 3566 "enable potentially expensive verification in ciObjectFactory") \ 3567 \ 3568 /* Priorities */ \ 3569 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3570 \ 3571 product(intx, ThreadPriorityPolicy, 0, \ 3572 "0 : Normal. "\ 3573 " VM chooses priorities that are appropriate for normal "\ 3574 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3575 " to normal native priority. Java priorities below " \ 3576 " NORM_PRIORITY map to lower native priority values. On "\ 3577 " Windows applications are allowed to use higher native "\ 3578 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3579 " not use the highest possible native priority, "\ 3580 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3581 " system threads. On Linux thread priorities are ignored "\ 3582 " because the OS does not support static priority in "\ 3583 " SCHED_OTHER scheduling class which is the only choice for "\ 3584 " non-root, non-realtime applications. "\ 3585 "1 : Aggressive. "\ 3586 " Java thread priorities map over to the entire range of "\ 3587 " native thread priorities. Higher Java thread priorities map "\ 3588 " to higher native thread priorities. This policy should be "\ 3589 " used with care, as sometimes it can cause performance "\ 3590 " degradation in the application and/or the entire system. On "\ 3591 " Linux this policy requires root privilege.") \ 3592 range(0, 1) \ 3593 \ 3594 product(bool, ThreadPriorityVerbose, false, \ 3595 "Print priority changes") \ 3596 \ 3597 product(intx, CompilerThreadPriority, -1, \ 3598 "The native priority at which compiler threads should run " \ 3599 "(-1 means no change)") \ 3600 range(min_jint, max_jint) \ 3601 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3602 \ 3603 product(intx, VMThreadPriority, -1, \ 3604 "The native priority at which the VM thread should run " \ 3605 "(-1 means no change)") \ 3606 range(-1, 127) \ 3607 \ 3608 product(bool, CompilerThreadHintNoPreempt, true, \ 3609 "(Solaris only) Give compiler threads an extra quanta") \ 3610 \ 3611 product(bool, VMThreadHintNoPreempt, false, \ 3612 "(Solaris only) Give VM thread an extra quanta") \ 3613 \ 3614 product(intx, JavaPriority1_To_OSPriority, -1, \ 3615 "Map Java priorities to OS priorities") \ 3616 range(-1, 127) \ 3617 \ 3618 product(intx, JavaPriority2_To_OSPriority, -1, \ 3619 "Map Java priorities to OS priorities") \ 3620 range(-1, 127) \ 3621 \ 3622 product(intx, JavaPriority3_To_OSPriority, -1, \ 3623 "Map Java priorities to OS priorities") \ 3624 range(-1, 127) \ 3625 \ 3626 product(intx, JavaPriority4_To_OSPriority, -1, \ 3627 "Map Java priorities to OS priorities") \ 3628 range(-1, 127) \ 3629 \ 3630 product(intx, JavaPriority5_To_OSPriority, -1, \ 3631 "Map Java priorities to OS priorities") \ 3632 range(-1, 127) \ 3633 \ 3634 product(intx, JavaPriority6_To_OSPriority, -1, \ 3635 "Map Java priorities to OS priorities") \ 3636 range(-1, 127) \ 3637 \ 3638 product(intx, JavaPriority7_To_OSPriority, -1, \ 3639 "Map Java priorities to OS priorities") \ 3640 range(-1, 127) \ 3641 \ 3642 product(intx, JavaPriority8_To_OSPriority, -1, \ 3643 "Map Java priorities to OS priorities") \ 3644 range(-1, 127) \ 3645 \ 3646 product(intx, JavaPriority9_To_OSPriority, -1, \ 3647 "Map Java priorities to OS priorities") \ 3648 range(-1, 127) \ 3649 \ 3650 product(intx, JavaPriority10_To_OSPriority,-1, \ 3651 "Map Java priorities to OS priorities") \ 3652 range(-1, 127) \ 3653 \ 3654 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3655 "Java thread priority 10 maps to critical scheduling priority") \ 3656 \ 3657 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3658 "Compiler thread(s) run at critical scheduling priority") \ 3659 \ 3660 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3661 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3662 \ 3663 /* compiler debugging */ \ 3664 notproduct(intx, CompileTheWorldStartAt, 1, \ 3665 "First class to consider when using +CompileTheWorld") \ 3666 \ 3667 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3668 "Last class to consider when using +CompileTheWorld") \ 3669 \ 3670 develop(intx, NewCodeParameter, 0, \ 3671 "Testing Only: Create a dedicated integer parameter before " \ 3672 "putback") \ 3673 \ 3674 /* new oopmap storage allocation */ \ 3675 develop(intx, MinOopMapAllocation, 8, \ 3676 "Minimum number of OopMap entries in an OopMapSet") \ 3677 \ 3678 /* Background Compilation */ \ 3679 develop(intx, LongCompileThreshold, 50, \ 3680 "Used with +TraceLongCompiles") \ 3681 \ 3682 /* recompilation */ \ 3683 product_pd(intx, CompileThreshold, \ 3684 "number of interpreted method invocations before (re-)compiling") \ 3685 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3686 \ 3687 product(double, CompileThresholdScaling, 1.0, \ 3688 "Factor to control when first compilation happens " \ 3689 "(both with and without tiered compilation): " \ 3690 "values greater than 1.0 delay counter overflow, " \ 3691 "values between 0 and 1.0 rush counter overflow, " \ 3692 "value of 1.0 leaves compilation thresholds unchanged " \ 3693 "value of 0.0 is equivalent to -Xint. " \ 3694 "" \ 3695 "Flag can be set as per-method option. " \ 3696 "If a value is specified for a method, compilation thresholds " \ 3697 "for that method are scaled by both the value of the global flag "\ 3698 "and the value of the per-method flag.") \ 3699 range(0.0, DBL_MAX) \ 3700 \ 3701 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3702 "Interpreter (tier 0) invocation notification frequency") \ 3703 range(0, 30) \ 3704 \ 3705 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3706 "C1 without MDO (tier 2) invocation notification frequency") \ 3707 range(0, 30) \ 3708 \ 3709 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3710 "C1 with MDO profiling (tier 3) invocation notification " \ 3711 "frequency") \ 3712 range(0, 30) \ 3713 \ 3714 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3715 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3716 range(0, 30) \ 3717 \ 3718 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3719 "Interpreter (tier 0) invocation notification frequency") \ 3720 range(0, 30) \ 3721 \ 3722 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3723 "C1 without MDO (tier 2) invocation notification frequency") \ 3724 range(0, 30) \ 3725 \ 3726 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3727 "C1 with MDO profiling (tier 3) invocation notification " \ 3728 "frequency") \ 3729 range(0, 30) \ 3730 \ 3731 product(intx, Tier2CompileThreshold, 0, \ 3732 "threshold at which tier 2 compilation is invoked") \ 3733 range(0, max_jint) \ 3734 \ 3735 product(intx, Tier2BackEdgeThreshold, 0, \ 3736 "Back edge threshold at which tier 2 compilation is invoked") \ 3737 range(0, max_jint) \ 3738 \ 3739 product(intx, Tier3InvocationThreshold, 200, \ 3740 "Compile if number of method invocations crosses this " \ 3741 "threshold") \ 3742 range(0, max_jint) \ 3743 \ 3744 product(intx, Tier3MinInvocationThreshold, 100, \ 3745 "Minimum invocation to compile at tier 3") \ 3746 range(0, max_jint) \ 3747 \ 3748 product(intx, Tier3CompileThreshold, 2000, \ 3749 "Threshold at which tier 3 compilation is invoked (invocation " \ 3750 "minimum must be satisfied)") \ 3751 range(0, max_jint) \ 3752 \ 3753 product(intx, Tier3BackEdgeThreshold, 60000, \ 3754 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3755 range(0, max_jint) \ 3756 \ 3757 product(intx, Tier4InvocationThreshold, 5000, \ 3758 "Compile if number of method invocations crosses this " \ 3759 "threshold") \ 3760 range(0, max_jint) \ 3761 \ 3762 product(intx, Tier4MinInvocationThreshold, 600, \ 3763 "Minimum invocation to compile at tier 4") \ 3764 range(0, max_jint) \ 3765 \ 3766 product(intx, Tier4CompileThreshold, 15000, \ 3767 "Threshold at which tier 4 compilation is invoked (invocation " \ 3768 "minimum must be satisfied") \ 3769 range(0, max_jint) \ 3770 \ 3771 product(intx, Tier4BackEdgeThreshold, 40000, \ 3772 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3773 range(0, max_jint) \ 3774 \ 3775 product(intx, Tier3DelayOn, 5, \ 3776 "If C2 queue size grows over this amount per compiler thread " \ 3777 "stop compiling at tier 3 and start compiling at tier 2") \ 3778 range(0, max_jint) \ 3779 \ 3780 product(intx, Tier3DelayOff, 2, \ 3781 "If C2 queue size is less than this amount per compiler thread " \ 3782 "allow methods compiled at tier 2 transition to tier 3") \ 3783 range(0, max_jint) \ 3784 \ 3785 product(intx, Tier3LoadFeedback, 5, \ 3786 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3787 "reaches this amount per compiler thread") \ 3788 range(0, max_jint) \ 3789 \ 3790 product(intx, Tier4LoadFeedback, 3, \ 3791 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3792 "reaches this amount per compiler thread") \ 3793 range(0, max_jint) \ 3794 \ 3795 product(intx, TieredCompileTaskTimeout, 50, \ 3796 "Kill compile task if method was not used within " \ 3797 "given timeout in milliseconds") \ 3798 range(0, max_intx) \ 3799 \ 3800 product(intx, TieredStopAtLevel, 4, \ 3801 "Stop at given compilation level") \ 3802 range(0, 4) \ 3803 \ 3804 product(intx, Tier0ProfilingStartPercentage, 200, \ 3805 "Start profiling in interpreter if the counters exceed tier 3 " \ 3806 "thresholds by the specified percentage") \ 3807 range(0, max_jint) \ 3808 \ 3809 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3810 "Increase the compile threshold for C1 compilation if the code " \ 3811 "cache is filled by the specified percentage") \ 3812 range(0, 99) \ 3813 \ 3814 product(intx, TieredRateUpdateMinTime, 1, \ 3815 "Minimum rate sampling interval (in milliseconds)") \ 3816 range(0, max_intx) \ 3817 \ 3818 product(intx, TieredRateUpdateMaxTime, 25, \ 3819 "Maximum rate sampling interval (in milliseconds)") \ 3820 range(0, max_intx) \ 3821 \ 3822 product_pd(bool, TieredCompilation, \ 3823 "Enable tiered compilation") \ 3824 \ 3825 product(bool, PrintTieredEvents, false, \ 3826 "Print tiered events notifications") \ 3827 \ 3828 product_pd(intx, OnStackReplacePercentage, \ 3829 "NON_TIERED number of method invocations/branches (expressed as " \ 3830 "% of CompileThreshold) before (re-)compiling OSR code") \ 3831 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3832 \ 3833 product(intx, InterpreterProfilePercentage, 33, \ 3834 "NON_TIERED number of method invocations/branches (expressed as " \ 3835 "% of CompileThreshold) before profiling in the interpreter") \ 3836 range(0, 100) \ 3837 \ 3838 develop(intx, MaxRecompilationSearchLength, 10, \ 3839 "The maximum number of frames to inspect when searching for " \ 3840 "recompilee") \ 3841 \ 3842 develop(intx, MaxInterpretedSearchLength, 3, \ 3843 "The maximum number of interpreted frames to skip when searching "\ 3844 "for recompilee") \ 3845 \ 3846 develop(intx, DesiredMethodLimit, 8000, \ 3847 "The desired maximum method size (in bytecodes) after inlining") \ 3848 \ 3849 develop(intx, HugeMethodLimit, 8000, \ 3850 "Don't compile methods larger than this if " \ 3851 "+DontCompileHugeMethods") \ 3852 \ 3853 /* New JDK 1.4 reflection implementation */ \ 3854 \ 3855 develop(intx, FastSuperclassLimit, 8, \ 3856 "Depth of hardwired instanceof accelerator array") \ 3857 \ 3858 /* Properties for Java libraries */ \ 3859 \ 3860 product(size_t, MaxDirectMemorySize, 0, \ 3861 "Maximum total size of NIO direct-buffer allocations") \ 3862 range(0, (size_t)SIZE_MAX) \ 3863 \ 3864 /* Flags used for temporary code during development */ \ 3865 \ 3866 diagnostic(bool, UseNewCode, false, \ 3867 "Testing Only: Use the new version while testing") \ 3868 \ 3869 diagnostic(bool, UseNewCode2, false, \ 3870 "Testing Only: Use the new version while testing") \ 3871 \ 3872 diagnostic(bool, UseNewCode3, false, \ 3873 "Testing Only: Use the new version while testing") \ 3874 \ 3875 /* flags for performance data collection */ \ 3876 \ 3877 product(bool, UsePerfData, falseInEmbedded, \ 3878 "Flag to disable jvmstat instrumentation for performance testing "\ 3879 "and problem isolation purposes") \ 3880 \ 3881 product(bool, PerfDataSaveToFile, false, \ 3882 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3883 \ 3884 product(ccstr, PerfDataSaveFile, NULL, \ 3885 "Save PerfData memory to the specified absolute pathname. " \ 3886 "The string %p in the file name (if present) " \ 3887 "will be replaced by pid") \ 3888 \ 3889 product(intx, PerfDataSamplingInterval, 50, \ 3890 "Data sampling interval (in milliseconds)") \ 3891 range(PeriodicTask::min_interval, max_jint) \ 3892 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3893 \ 3894 develop(bool, PerfTraceDataCreation, false, \ 3895 "Trace creation of Performance Data Entries") \ 3896 \ 3897 develop(bool, PerfTraceMemOps, false, \ 3898 "Trace PerfMemory create/attach/detach calls") \ 3899 \ 3900 product(bool, PerfDisableSharedMem, false, \ 3901 "Store performance data in standard memory") \ 3902 \ 3903 product(intx, PerfDataMemorySize, 64*K, \ 3904 "Size of performance data memory region. Will be rounded " \ 3905 "up to a multiple of the native os page size.") \ 3906 range(128, 32*64*K) \ 3907 \ 3908 product(intx, PerfMaxStringConstLength, 1024, \ 3909 "Maximum PerfStringConstant string length before truncation") \ 3910 range(32, 32*K) \ 3911 \ 3912 product(bool, PerfAllowAtExitRegistration, false, \ 3913 "Allow registration of atexit() methods") \ 3914 \ 3915 product(bool, PerfBypassFileSystemCheck, false, \ 3916 "Bypass Win32 file system criteria checks (Windows Only)") \ 3917 \ 3918 product(intx, UnguardOnExecutionViolation, 0, \ 3919 "Unguard page and retry on no-execute fault (Win32 only) " \ 3920 "0=off, 1=conservative, 2=aggressive") \ 3921 range(0, 2) \ 3922 \ 3923 /* Serviceability Support */ \ 3924 \ 3925 product(bool, ManagementServer, false, \ 3926 "Create JMX Management Server") \ 3927 \ 3928 product(bool, DisableAttachMechanism, false, \ 3929 "Disable mechanism that allows tools to attach to this VM") \ 3930 \ 3931 product(bool, StartAttachListener, false, \ 3932 "Always start Attach Listener at VM startup") \ 3933 \ 3934 manageable(bool, PrintConcurrentLocks, false, \ 3935 "Print java.util.concurrent locks in thread dump") \ 3936 \ 3937 product(bool, TransmitErrorReport, false, \ 3938 "Enable error report transmission on erroneous termination") \ 3939 \ 3940 product(ccstr, ErrorReportServer, NULL, \ 3941 "Override built-in error report server address") \ 3942 \ 3943 /* Shared spaces */ \ 3944 \ 3945 product(bool, UseSharedSpaces, true, \ 3946 "Use shared spaces for metadata") \ 3947 \ 3948 product(bool, VerifySharedSpaces, false, \ 3949 "Verify shared spaces (false for default archive, true for " \ 3950 "archive specified by -XX:SharedArchiveFile)") \ 3951 \ 3952 product(bool, RequireSharedSpaces, false, \ 3953 "Require shared spaces for metadata") \ 3954 \ 3955 product(bool, DumpSharedSpaces, false, \ 3956 "Special mode: JVM reads a class list, loads classes, builds " \ 3957 "shared spaces, and dumps the shared spaces to a file to be " \ 3958 "used in future JVM runs") \ 3959 \ 3960 product(bool, PrintSharedSpaces, false, \ 3961 "Print usage of shared spaces") \ 3962 \ 3963 product(bool, PrintSharedArchiveAndExit, false, \ 3964 "Print shared archive file contents") \ 3965 \ 3966 product(bool, PrintSharedDictionary, false, \ 3967 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3968 "dictionary") \ 3969 \ 3970 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3971 "Size of read-write space for metadata (in bytes)") \ 3972 \ 3973 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3974 "Size of read-only space for metadata (in bytes)") \ 3975 \ 3976 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3977 "Size of the shared miscellaneous data area (in bytes)") \ 3978 \ 3979 product(uintx, SharedMiscCodeSize, 120*K, \ 3980 "Size of the shared miscellaneous code area (in bytes)") \ 3981 \ 3982 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3983 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3984 "Address to allocate shared memory region for class data") \ 3985 \ 3986 product(uintx, SharedSymbolTableBucketSize, 4, \ 3987 "Average number of symbols per bucket in shared table") \ 3988 range(2, 246) \ 3989 \ 3990 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3991 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3992 "classes. Just exclude them from the shared dictionary.") \ 3993 \ 3994 diagnostic(bool, PrintMethodHandleStubs, false, \ 3995 "Print generated stub code for method handles") \ 3996 \ 3997 develop(bool, TraceMethodHandles, false, \ 3998 "trace internal method handle operations") \ 3999 \ 4000 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4001 "perform extra checks when constructing method handles") \ 4002 \ 4003 diagnostic(bool, ShowHiddenFrames, false, \ 4004 "show method handle implementation frames (usually hidden)") \ 4005 \ 4006 experimental(bool, TrustFinalNonStaticFields, false, \ 4007 "trust final non-static declarations for constant folding") \ 4008 \ 4009 diagnostic(bool, FoldStableValues, true, \ 4010 "Optimize loads from stable fields (marked w/ @Stable)") \ 4011 \ 4012 develop(bool, TraceInvokeDynamic, false, \ 4013 "trace internal invoke dynamic operations") \ 4014 \ 4015 diagnostic(bool, PauseAtStartup, false, \ 4016 "Causes the VM to pause at startup time and wait for the pause " \ 4017 "file to be removed (default: ./vm.paused.<pid>)") \ 4018 \ 4019 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4020 "The file to create and for whose removal to await when pausing " \ 4021 "at startup. (default: ./vm.paused.<pid>)") \ 4022 \ 4023 diagnostic(bool, PauseAtExit, false, \ 4024 "Pause and wait for keypress on exit if a debugger is attached") \ 4025 \ 4026 product(bool, ExtendedDTraceProbes, false, \ 4027 "Enable performance-impacting dtrace probes") \ 4028 \ 4029 product(bool, DTraceMethodProbes, false, \ 4030 "Enable dtrace probes for method-entry and method-exit") \ 4031 \ 4032 product(bool, DTraceAllocProbes, false, \ 4033 "Enable dtrace probes for object allocation") \ 4034 \ 4035 product(bool, DTraceMonitorProbes, false, \ 4036 "Enable dtrace probes for monitor events") \ 4037 \ 4038 product(bool, RelaxAccessControlCheck, false, \ 4039 "Relax the access control checks in the verifier") \ 4040 \ 4041 product(uintx, StringTableSize, defaultStringTableSize, \ 4042 "Number of buckets in the interned String table") \ 4043 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4044 \ 4045 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4046 "Number of buckets in the JVM internal Symbol table") \ 4047 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4048 \ 4049 product(bool, UseStringDeduplication, false, \ 4050 "Use string deduplication") \ 4051 \ 4052 product(bool, PrintStringDeduplicationStatistics, false, \ 4053 "Print string deduplication statistics") \ 4054 \ 4055 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4056 "A string must reach this age (or be promoted to an old region) " \ 4057 "to be considered for deduplication") \ 4058 range(1, markOopDesc::max_age) \ 4059 \ 4060 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4061 "Force table resize every time the table is scanned") \ 4062 \ 4063 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4064 "Force table rehash every time the table is scanned") \ 4065 \ 4066 diagnostic(bool, WhiteBoxAPI, false, \ 4067 "Enable internal testing APIs") \ 4068 \ 4069 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4070 "Default survivor space alignment in bytes") \ 4071 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4072 \ 4073 product(bool , AllowNonVirtualCalls, false, \ 4074 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4075 \ 4076 product(ccstr, DumpLoadedClassList, NULL, \ 4077 "Dump the names all loaded classes, that could be stored into " \ 4078 "the CDS archive, in the specified file") \ 4079 \ 4080 product(ccstr, SharedClassListFile, NULL, \ 4081 "Override the default CDS class list") \ 4082 \ 4083 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4084 "Override the default location of the CDS archive file") \ 4085 \ 4086 product(ccstr, ExtraSharedClassListFile, NULL, \ 4087 "Extra classlist for building the CDS archive file") \ 4088 \ 4089 experimental(size_t, ArrayAllocatorMallocLimit, \ 4090 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4091 "Allocation less than this value will be allocated " \ 4092 "using malloc. Larger allocations will use mmap.") \ 4093 \ 4094 experimental(bool, AlwaysAtomicAccesses, false, \ 4095 "Accesses to all variables should always be atomic") \ 4096 \ 4097 product(bool, EnableTracing, false, \ 4098 "Enable event-based tracing") \ 4099 \ 4100 product(bool, UseLockedTracing, false, \ 4101 "Use locked-tracing when doing event-based tracing") \ 4102 \ 4103 diagnostic(bool, UseUnalignedAccesses, false, \ 4104 "Use unaligned memory accesses in Unsafe") \ 4105 \ 4106 product_pd(bool, PreserveFramePointer, \ 4107 "Use the FP register for holding the frame pointer " \ 4108 "and not as a general purpose register.") \ 4109 \ 4110 diagnostic(bool, CheckIntrinsics, true, \ 4111 "When a class C is loaded, check that " \ 4112 "(1) all intrinsics defined by the VM for class C are present "\ 4113 "in the loaded class file and are marked with the " \ 4114 "@HotSpotIntrinsicCandidate annotation, that " \ 4115 "(2) there is an intrinsic registered for all loaded methods " \ 4116 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4117 "annotation, and that " \ 4118 "(3) no orphan methods exist for class C (i.e., methods for " \ 4119 "which the VM declares an intrinsic but that are not declared "\ 4120 "in the loaded class C. " \ 4121 "Check (3) is available only in debug builds.") \ 4122 \ 4123 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4124 "Disable backwards compatibility for compile commands.") \ 4125 \ 4126 diagnostic(bool, PrintCompilerDirectives, false, \ 4127 "Print compiler directives on installation.") 4128 4129 /* 4130 * Macros for factoring of globals 4131 */ 4132 4133 // Interface macros 4134 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4135 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4136 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4137 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4138 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4139 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4140 #ifdef PRODUCT 4141 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4142 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4143 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4144 #else 4145 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4146 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4147 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4148 #endif // PRODUCT 4149 // Special LP64 flags, product only needed for now. 4150 #ifdef _LP64 4151 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4152 #else 4153 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4154 #endif // _LP64 4155 4156 // Implementation macros 4157 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4158 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4159 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4160 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4161 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4162 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4163 #ifdef PRODUCT 4164 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4165 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4166 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4167 #else 4168 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4169 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4170 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4171 #endif // PRODUCT 4172 #ifdef _LP64 4173 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4174 #else 4175 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4176 #endif // _LP64 4177 4178 // Only materialize src code for range checking when required, ignore otherwise 4179 #define IGNORE_RANGE(a, b) 4180 // Only materialize src code for contraint checking when required, ignore otherwise 4181 #define IGNORE_CONSTRAINT(func,type) 4182 4183 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4184 DECLARE_PD_DEVELOPER_FLAG, \ 4185 DECLARE_PRODUCT_FLAG, \ 4186 DECLARE_PD_PRODUCT_FLAG, \ 4187 DECLARE_DIAGNOSTIC_FLAG, \ 4188 DECLARE_EXPERIMENTAL_FLAG, \ 4189 DECLARE_NOTPRODUCT_FLAG, \ 4190 DECLARE_MANAGEABLE_FLAG, \ 4191 DECLARE_PRODUCT_RW_FLAG, \ 4192 DECLARE_LP64_PRODUCT_FLAG, \ 4193 IGNORE_RANGE, \ 4194 IGNORE_CONSTRAINT) 4195 4196 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4197 DECLARE_PD_DEVELOPER_FLAG, \ 4198 DECLARE_PRODUCT_FLAG, \ 4199 DECLARE_PD_PRODUCT_FLAG, \ 4200 DECLARE_DIAGNOSTIC_FLAG, \ 4201 DECLARE_NOTPRODUCT_FLAG, \ 4202 IGNORE_RANGE, \ 4203 IGNORE_CONSTRAINT) 4204 4205 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4206 DECLARE_PRODUCT_FLAG, \ 4207 DECLARE_DIAGNOSTIC_FLAG, \ 4208 DECLARE_EXPERIMENTAL_FLAG, \ 4209 DECLARE_NOTPRODUCT_FLAG, \ 4210 IGNORE_RANGE, \ 4211 IGNORE_CONSTRAINT) 4212 4213 // Extensions 4214 4215 #include "runtime/globals_ext.hpp" 4216 4217 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP