1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/debug.hpp" 29 #include <float.h> // for DBL_MAX 30 31 // use this for flags that are true per default in the tiered build 32 // but false in non-tiered builds, and vice versa 33 #ifdef TIERED 34 #define trueInTiered true 35 #define falseInTiered false 36 #else 37 #define trueInTiered false 38 #define falseInTiered true 39 #endif 40 41 #ifdef TARGET_ARCH_x86 42 # include "globals_x86.hpp" 43 #endif 44 #ifdef TARGET_ARCH_sparc 45 # include "globals_sparc.hpp" 46 #endif 47 #ifdef TARGET_ARCH_zero 48 # include "globals_zero.hpp" 49 #endif 50 #ifdef TARGET_ARCH_arm 51 # include "globals_arm.hpp" 52 #endif 53 #ifdef TARGET_ARCH_ppc 54 # include "globals_ppc.hpp" 55 #endif 56 #ifdef TARGET_ARCH_aarch64 57 # include "globals_aarch64.hpp" 58 #endif 59 #ifdef TARGET_OS_FAMILY_linux 60 # include "globals_linux.hpp" 61 #endif 62 #ifdef TARGET_OS_FAMILY_solaris 63 # include "globals_solaris.hpp" 64 #endif 65 #ifdef TARGET_OS_FAMILY_windows 66 # include "globals_windows.hpp" 67 #endif 68 #ifdef TARGET_OS_FAMILY_aix 69 # include "globals_aix.hpp" 70 #endif 71 #ifdef TARGET_OS_FAMILY_bsd 72 # include "globals_bsd.hpp" 73 #endif 74 #ifdef TARGET_OS_ARCH_linux_x86 75 # include "globals_linux_x86.hpp" 76 #endif 77 #ifdef TARGET_OS_ARCH_linux_sparc 78 # include "globals_linux_sparc.hpp" 79 #endif 80 #ifdef TARGET_OS_ARCH_linux_zero 81 # include "globals_linux_zero.hpp" 82 #endif 83 #ifdef TARGET_OS_ARCH_solaris_x86 84 # include "globals_solaris_x86.hpp" 85 #endif 86 #ifdef TARGET_OS_ARCH_solaris_sparc 87 # include "globals_solaris_sparc.hpp" 88 #endif 89 #ifdef TARGET_OS_ARCH_windows_x86 90 # include "globals_windows_x86.hpp" 91 #endif 92 #ifdef TARGET_OS_ARCH_linux_arm 93 # include "globals_linux_arm.hpp" 94 #endif 95 #ifdef TARGET_OS_ARCH_linux_ppc 96 # include "globals_linux_ppc.hpp" 97 #endif 98 #ifdef TARGET_OS_ARCH_linux_aarch64 99 # include "globals_linux_aarch64.hpp" 100 #endif 101 #ifdef TARGET_OS_ARCH_aix_ppc 102 # include "globals_aix_ppc.hpp" 103 #endif 104 #ifdef TARGET_OS_ARCH_bsd_x86 105 # include "globals_bsd_x86.hpp" 106 #endif 107 #ifdef TARGET_OS_ARCH_bsd_zero 108 # include "globals_bsd_zero.hpp" 109 #endif 110 #ifdef COMPILER1 111 #ifdef TARGET_ARCH_x86 112 # include "c1_globals_x86.hpp" 113 #endif 114 #ifdef TARGET_ARCH_sparc 115 # include "c1_globals_sparc.hpp" 116 #endif 117 #ifdef TARGET_ARCH_arm 118 # include "c1_globals_arm.hpp" 119 #endif 120 #ifdef TARGET_ARCH_aarch64 121 # include "c1_globals_aarch64.hpp" 122 #endif 123 #ifdef TARGET_OS_FAMILY_linux 124 # include "c1_globals_linux.hpp" 125 #endif 126 #ifdef TARGET_OS_FAMILY_solaris 127 # include "c1_globals_solaris.hpp" 128 #endif 129 #ifdef TARGET_OS_FAMILY_windows 130 # include "c1_globals_windows.hpp" 131 #endif 132 #ifdef TARGET_OS_FAMILY_aix 133 # include "c1_globals_aix.hpp" 134 #endif 135 #ifdef TARGET_OS_FAMILY_bsd 136 # include "c1_globals_bsd.hpp" 137 #endif 138 #ifdef TARGET_ARCH_ppc 139 # include "c1_globals_ppc.hpp" 140 #endif 141 #endif 142 #ifdef COMPILER2 143 #ifdef TARGET_ARCH_x86 144 # include "c2_globals_x86.hpp" 145 #endif 146 #ifdef TARGET_ARCH_sparc 147 # include "c2_globals_sparc.hpp" 148 #endif 149 #ifdef TARGET_ARCH_arm 150 # include "c2_globals_arm.hpp" 151 #endif 152 #ifdef TARGET_ARCH_ppc 153 # include "c2_globals_ppc.hpp" 154 #endif 155 #ifdef TARGET_ARCH_aarch64 156 # include "c2_globals_aarch64.hpp" 157 #endif 158 #ifdef TARGET_OS_FAMILY_linux 159 # include "c2_globals_linux.hpp" 160 #endif 161 #ifdef TARGET_OS_FAMILY_solaris 162 # include "c2_globals_solaris.hpp" 163 #endif 164 #ifdef TARGET_OS_FAMILY_windows 165 # include "c2_globals_windows.hpp" 166 #endif 167 #ifdef TARGET_OS_FAMILY_aix 168 # include "c2_globals_aix.hpp" 169 #endif 170 #ifdef TARGET_OS_FAMILY_bsd 171 # include "c2_globals_bsd.hpp" 172 #endif 173 #endif 174 #ifdef SHARK 175 #ifdef TARGET_ARCH_zero 176 # include "shark_globals_zero.hpp" 177 #endif 178 #endif 179 180 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI 181 define_pd_global(bool, BackgroundCompilation, false); 182 define_pd_global(bool, UseTLAB, false); 183 define_pd_global(bool, CICompileOSR, false); 184 define_pd_global(bool, UseTypeProfile, false); 185 define_pd_global(bool, UseOnStackReplacement, false); 186 define_pd_global(bool, InlineIntrinsics, false); 187 define_pd_global(bool, PreferInterpreterNativeStubs, true); 188 define_pd_global(bool, ProfileInterpreter, false); 189 define_pd_global(bool, ProfileTraps, false); 190 define_pd_global(bool, TieredCompilation, false); 191 192 define_pd_global(intx, CompileThreshold, 0); 193 194 define_pd_global(intx, OnStackReplacePercentage, 0); 195 define_pd_global(bool, ResizeTLAB, false); 196 define_pd_global(intx, FreqInlineSize, 0); 197 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 198 define_pd_global(intx, InlineClassNatives, true); 199 define_pd_global(intx, InlineUnsafeOps, true); 200 define_pd_global(intx, InitialCodeCacheSize, 160*K); 201 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 202 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 203 define_pd_global(intx, ProfiledCodeHeapSize, 0); 204 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 205 206 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 207 define_pd_global(intx, CodeCacheMinBlockLength, 1); 208 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 209 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 210 define_pd_global(bool, NeverActAsServerClassMachine, true); 211 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 212 #define CI_COMPILER_COUNT 0 213 #else 214 215 #if defined(COMPILER2) || INCLUDE_JVMCI 216 #define CI_COMPILER_COUNT 2 217 #else 218 #define CI_COMPILER_COUNT 1 219 #endif // COMPILER2 || INCLUDE_JVMCI 220 221 #endif // no compilers 222 223 // string type aliases used only in this file 224 typedef const char* ccstr; 225 typedef const char* ccstrlist; // represents string arguments which accumulate 226 227 struct Flag { 228 enum Flags { 229 // value origin 230 DEFAULT = 0, 231 COMMAND_LINE = 1, 232 ENVIRON_VAR = 2, 233 CONFIG_FILE = 3, 234 MANAGEMENT = 4, 235 ERGONOMIC = 5, 236 ATTACH_ON_DEMAND = 6, 237 INTERNAL = 7, 238 239 LAST_VALUE_ORIGIN = INTERNAL, 240 VALUE_ORIGIN_BITS = 4, 241 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 242 243 // flag kind 244 KIND_PRODUCT = 1 << 4, 245 KIND_MANAGEABLE = 1 << 5, 246 KIND_DIAGNOSTIC = 1 << 6, 247 KIND_EXPERIMENTAL = 1 << 7, 248 KIND_NOT_PRODUCT = 1 << 8, 249 KIND_DEVELOP = 1 << 9, 250 KIND_PLATFORM_DEPENDENT = 1 << 10, 251 KIND_READ_WRITE = 1 << 11, 252 KIND_C1 = 1 << 12, 253 KIND_C2 = 1 << 13, 254 KIND_ARCH = 1 << 14, 255 KIND_SHARK = 1 << 15, 256 KIND_LP64_PRODUCT = 1 << 16, 257 KIND_COMMERCIAL = 1 << 17, 258 KIND_JVMCI = 1 << 18, 259 260 KIND_MASK = ~VALUE_ORIGIN_MASK 261 }; 262 263 enum Error { 264 // no error 265 SUCCESS = 0, 266 // flag name is missing 267 MISSING_NAME, 268 // flag value is missing 269 MISSING_VALUE, 270 // error parsing the textual form of the value 271 WRONG_FORMAT, 272 // flag is not writeable 273 NON_WRITABLE, 274 // flag value is outside of its bounds 275 OUT_OF_BOUNDS, 276 // flag value violates its constraint 277 VIOLATES_CONSTRAINT, 278 // there is no flag with the given name 279 INVALID_FLAG, 280 // other, unspecified error related to setting the flag 281 ERR_OTHER 282 }; 283 284 enum MsgType { 285 NONE = 0, 286 DIAGNOSTIC_FLAG_BUT_LOCKED, 287 EXPERIMENTAL_FLAG_BUT_LOCKED, 288 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 289 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 290 }; 291 292 const char* _type; 293 const char* _name; 294 void* _addr; 295 NOT_PRODUCT(const char* _doc;) 296 Flags _flags; 297 298 // points to all Flags static array 299 static Flag* flags; 300 301 // number of flags 302 static size_t numFlags; 303 304 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 305 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 306 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 307 308 void check_writable(); 309 310 bool is_bool() const; 311 bool get_bool() const; 312 void set_bool(bool value); 313 314 bool is_int() const; 315 int get_int() const; 316 void set_int(int value); 317 318 bool is_uint() const; 319 uint get_uint() const; 320 void set_uint(uint value); 321 322 bool is_intx() const; 323 intx get_intx() const; 324 void set_intx(intx value); 325 326 bool is_uintx() const; 327 uintx get_uintx() const; 328 void set_uintx(uintx value); 329 330 bool is_uint64_t() const; 331 uint64_t get_uint64_t() const; 332 void set_uint64_t(uint64_t value); 333 334 bool is_size_t() const; 335 size_t get_size_t() const; 336 void set_size_t(size_t value); 337 338 bool is_double() const; 339 double get_double() const; 340 void set_double(double value); 341 342 bool is_ccstr() const; 343 bool ccstr_accumulates() const; 344 ccstr get_ccstr() const; 345 void set_ccstr(ccstr value); 346 347 Flags get_origin(); 348 void set_origin(Flags origin); 349 350 bool is_default(); 351 bool is_ergonomic(); 352 bool is_command_line(); 353 354 bool is_product() const; 355 bool is_manageable() const; 356 bool is_diagnostic() const; 357 bool is_experimental() const; 358 bool is_notproduct() const; 359 bool is_develop() const; 360 bool is_read_write() const; 361 bool is_commercial() const; 362 363 bool is_constant_in_binary() const; 364 365 bool is_unlocker() const; 366 bool is_unlocked() const; 367 bool is_writeable() const; 368 bool is_external() const; 369 370 bool is_unlocker_ext() const; 371 bool is_unlocked_ext() const; 372 bool is_writeable_ext() const; 373 bool is_external_ext() const; 374 375 void unlock_diagnostic(); 376 377 Flag::MsgType get_locked_message(char*, int) const; 378 void get_locked_message_ext(char*, int) const; 379 380 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 381 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 382 void print_kind(outputStream* st); 383 void print_as_flag(outputStream* st); 384 385 static const char* flag_error_str(Flag::Error error); 386 }; 387 388 // debug flags control various aspects of the VM and are global accessible 389 390 // use FlagSetting to temporarily change some debug flag 391 // e.g. FlagSetting fs(DebugThisAndThat, true); 392 // restored to previous value upon leaving scope 393 class FlagSetting { 394 bool val; 395 bool* flag; 396 public: 397 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 398 ~FlagSetting() { *flag = val; } 399 }; 400 401 402 class CounterSetting { 403 intx* counter; 404 public: 405 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 406 ~CounterSetting() { (*counter)--; } 407 }; 408 409 class IntFlagSetting { 410 int val; 411 int* flag; 412 public: 413 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 414 ~IntFlagSetting() { *flag = val; } 415 }; 416 417 class UIntFlagSetting { 418 uint val; 419 uint* flag; 420 public: 421 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 422 ~UIntFlagSetting() { *flag = val; } 423 }; 424 425 class UIntXFlagSetting { 426 uintx val; 427 uintx* flag; 428 public: 429 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 430 ~UIntXFlagSetting() { *flag = val; } 431 }; 432 433 class DoubleFlagSetting { 434 double val; 435 double* flag; 436 public: 437 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 438 ~DoubleFlagSetting() { *flag = val; } 439 }; 440 441 class SizeTFlagSetting { 442 size_t val; 443 size_t* flag; 444 public: 445 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 446 ~SizeTFlagSetting() { *flag = val; } 447 }; 448 449 450 class CommandLineFlags { 451 public: 452 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 453 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 454 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 455 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 456 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 457 458 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 459 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); } 460 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 461 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 462 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 463 464 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 465 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 466 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 467 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 468 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 469 470 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 471 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 472 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 473 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 474 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 475 476 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 477 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 478 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 479 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 480 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 481 482 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 483 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); } 484 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 485 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 486 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 487 488 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 489 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 490 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 491 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 492 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 493 494 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 495 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 496 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 497 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 498 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 499 500 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 501 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 502 // Contract: Flag will make private copy of the incoming value. 503 // Outgoing value is always malloc-ed, and caller MUST call free. 504 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 505 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 506 507 // Returns false if name is not a command line flag. 508 static bool wasSetOnCmdline(const char* name, bool* value); 509 static void printSetFlags(outputStream* out); 510 511 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 512 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 513 514 static void verify() PRODUCT_RETURN; 515 }; 516 517 // use this for flags that are true by default in the debug version but 518 // false in the optimized version, and vice versa 519 #ifdef ASSERT 520 #define trueInDebug true 521 #define falseInDebug false 522 #else 523 #define trueInDebug false 524 #define falseInDebug true 525 #endif 526 527 // use this for flags that are true per default in the product build 528 // but false in development builds, and vice versa 529 #ifdef PRODUCT 530 #define trueInProduct true 531 #define falseInProduct false 532 #else 533 #define trueInProduct false 534 #define falseInProduct true 535 #endif 536 537 #ifdef JAVASE_EMBEDDED 538 #define falseInEmbedded false 539 #else 540 #define falseInEmbedded true 541 #endif 542 543 // develop flags are settable / visible only during development and are constant in the PRODUCT version 544 // product flags are always settable / visible 545 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 546 547 // A flag must be declared with one of the following types: 548 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 549 // The type "ccstr" is an alias for "const char*" and is used 550 // only in this file, because the macrology requires single-token type names. 551 552 // Note: Diagnostic options not meant for VM tuning or for product modes. 553 // They are to be used for VM quality assurance or field diagnosis 554 // of VM bugs. They are hidden so that users will not be encouraged to 555 // try them as if they were VM ordinary execution options. However, they 556 // are available in the product version of the VM. Under instruction 557 // from support engineers, VM customers can turn them on to collect 558 // diagnostic information about VM problems. To use a VM diagnostic 559 // option, you must first specify +UnlockDiagnosticVMOptions. 560 // (This master switch also affects the behavior of -Xprintflags.) 561 // 562 // experimental flags are in support of features that are not 563 // part of the officially supported product, but are available 564 // for experimenting with. They could, for example, be performance 565 // features that may not have undergone full or rigorous QA, but which may 566 // help performance in some cases and released for experimentation 567 // by the community of users and developers. This flag also allows one to 568 // be able to build a fully supported product that nonetheless also 569 // ships with some unsupported, lightly tested, experimental features. 570 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 571 // UnlockExperimentalVMOptions flag, which allows the control and 572 // modification of the experimental flags. 573 // 574 // Nota bene: neither diagnostic nor experimental options should be used casually, 575 // and they are not supported on production loads, except under explicit 576 // direction from support engineers. 577 // 578 // manageable flags are writeable external product flags. 579 // They are dynamically writeable through the JDK management interface 580 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 581 // These flags are external exported interface (see CCC). The list of 582 // manageable flags can be queried programmatically through the management 583 // interface. 584 // 585 // A flag can be made as "manageable" only if 586 // - the flag is defined in a CCC as an external exported interface. 587 // - the VM implementation supports dynamic setting of the flag. 588 // This implies that the VM must *always* query the flag variable 589 // and not reuse state related to the flag state at any given time. 590 // - you want the flag to be queried programmatically by the customers. 591 // 592 // product_rw flags are writeable internal product flags. 593 // They are like "manageable" flags but for internal/private use. 594 // The list of product_rw flags are internal/private flags which 595 // may be changed/removed in a future release. It can be set 596 // through the management interface to get/set value 597 // when the name of flag is supplied. 598 // 599 // A flag can be made as "product_rw" only if 600 // - the VM implementation supports dynamic setting of the flag. 601 // This implies that the VM must *always* query the flag variable 602 // and not reuse state related to the flag state at any given time. 603 // 604 // Note that when there is a need to support develop flags to be writeable, 605 // it can be done in the same way as product_rw. 606 // 607 // range is a macro that will expand to min and max arguments for range 608 // checking code if provided - see commandLineFlagRangeList.hpp 609 // 610 // constraint is a macro that will expand to custom function call 611 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 612 // 613 614 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 615 \ 616 lp64_product(bool, UseCompressedOops, false, \ 617 "Use 32-bit object references in 64-bit VM. " \ 618 "lp64_product means flag is always constant in 32 bit VM") \ 619 \ 620 lp64_product(bool, UseCompressedClassPointers, false, \ 621 "Use 32-bit class pointers in 64-bit VM. " \ 622 "lp64_product means flag is always constant in 32 bit VM") \ 623 \ 624 notproduct(bool, CheckCompressedOops, true, \ 625 "Generate checks in encoding/decoding code in debug VM") \ 626 \ 627 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 628 "Heap allocation steps through preferred address regions to find" \ 629 " where it can allocate the heap. Number of steps to take per " \ 630 "region.") \ 631 range(1, max_uintx) \ 632 \ 633 diagnostic(bool, PrintCompressedOopsMode, false, \ 634 "Print compressed oops base address and encoding mode") \ 635 \ 636 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 637 "Default object alignment in bytes, 8 is minimum") \ 638 range(8, 256) \ 639 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 640 \ 641 product(bool, AssumeMP, false, \ 642 "Instruct the VM to assume multiple processors are available") \ 643 \ 644 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 645 /* removal testing. It was supposed to be removed before FCS but has */ \ 646 /* been re-added (see 6401008) */ \ 647 product_pd(bool, UseMembar, \ 648 "(Unstable) Issues membars on thread state transitions") \ 649 \ 650 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 651 "Clean the chunk pool asynchronously") \ 652 \ 653 experimental(bool, AlwaysSafeConstructors, false, \ 654 "Force safe construction, as if all fields are final.") \ 655 \ 656 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 657 "Enable normal processing of flags relating to field diagnostics")\ 658 \ 659 experimental(bool, UnlockExperimentalVMOptions, false, \ 660 "Enable normal processing of flags relating to experimental " \ 661 "features") \ 662 \ 663 product(bool, JavaMonitorsInStackTrace, true, \ 664 "Print information about Java monitor locks when the stacks are" \ 665 "dumped") \ 666 \ 667 product_pd(bool, UseLargePages, \ 668 "Use large page memory") \ 669 \ 670 product_pd(bool, UseLargePagesIndividualAllocation, \ 671 "Allocate large pages individually for better affinity") \ 672 \ 673 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 674 "Fail large pages individual allocation") \ 675 \ 676 product(bool, UseLargePagesInMetaspace, false, \ 677 "Use large page memory in metaspace. " \ 678 "Only used if UseLargePages is enabled.") \ 679 \ 680 develop(bool, TracePageSizes, false, \ 681 "Trace page size selection and usage") \ 682 \ 683 product(bool, UseNUMA, false, \ 684 "Use NUMA if available") \ 685 \ 686 product(bool, UseNUMAInterleaving, false, \ 687 "Interleave memory across NUMA nodes if available") \ 688 \ 689 product(size_t, NUMAInterleaveGranularity, 2*M, \ 690 "Granularity to use for NUMA interleaving on Windows OS") \ 691 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 692 \ 693 product(bool, ForceNUMA, false, \ 694 "Force NUMA optimizations on single-node/UMA systems") \ 695 \ 696 product(uintx, NUMAChunkResizeWeight, 20, \ 697 "Percentage (0-100) used to weight the current sample when " \ 698 "computing exponentially decaying average for " \ 699 "AdaptiveNUMAChunkSizing") \ 700 range(0, 100) \ 701 \ 702 product(size_t, NUMASpaceResizeRate, 1*G, \ 703 "Do not reallocate more than this amount per collection") \ 704 range(0, max_uintx) \ 705 \ 706 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 707 "Enable adaptive chunk sizing for NUMA") \ 708 \ 709 product(bool, NUMAStats, false, \ 710 "Print NUMA stats in detailed heap information") \ 711 \ 712 product(uintx, NUMAPageScanRate, 256, \ 713 "Maximum number of pages to include in the page scan procedure") \ 714 range(0, max_uintx) \ 715 \ 716 product_pd(bool, NeedsDeoptSuspend, \ 717 "True for register window machines (sparc/ia64)") \ 718 \ 719 product(intx, UseSSE, 99, \ 720 "Highest supported SSE instructions set on x86/x64") \ 721 range(0, 99) \ 722 \ 723 product(bool, UseAES, false, \ 724 "Control whether AES instructions can be used on x86/x64") \ 725 \ 726 product(bool, UseSHA, false, \ 727 "Control whether SHA instructions can be used " \ 728 "on SPARC, on ARM and on x86") \ 729 \ 730 product(bool, UseGHASHIntrinsics, false, \ 731 "Use intrinsics for GHASH versions of crypto") \ 732 \ 733 product(size_t, LargePageSizeInBytes, 0, \ 734 "Large page size (0 to let VM choose the page size)") \ 735 range(0, max_uintx) \ 736 \ 737 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 738 "Use large pages if maximum heap is at least this big") \ 739 range(0, max_uintx) \ 740 \ 741 product(bool, ForceTimeHighResolution, false, \ 742 "Using high time resolution (for Win32 only)") \ 743 \ 744 develop(bool, TracePcPatching, false, \ 745 "Trace usage of frame::patch_pc") \ 746 \ 747 develop(bool, TraceJumps, false, \ 748 "Trace assembly jumps in thread ring buffer") \ 749 \ 750 develop(bool, TraceRelocator, false, \ 751 "Trace the bytecode relocator") \ 752 \ 753 develop(bool, TraceLongCompiles, false, \ 754 "Print out every time compilation is longer than " \ 755 "a given threshold") \ 756 \ 757 develop(bool, SafepointALot, false, \ 758 "Generate a lot of safepoints. This works with " \ 759 "GuaranteedSafepointInterval") \ 760 \ 761 product_pd(bool, BackgroundCompilation, \ 762 "A thread requesting compilation is not blocked during " \ 763 "compilation") \ 764 \ 765 product(bool, PrintVMQWaitTime, false, \ 766 "Print out the waiting time in VM operation queue") \ 767 \ 768 develop(bool, TraceOopMapGeneration, false, \ 769 "Show OopMapGeneration") \ 770 \ 771 product(bool, MethodFlushing, true, \ 772 "Reclamation of zombie and not-entrant methods") \ 773 \ 774 develop(bool, VerifyStack, false, \ 775 "Verify stack of each thread when it is entering a runtime call") \ 776 \ 777 diagnostic(bool, ForceUnreachable, false, \ 778 "Make all non code cache addresses to be unreachable by " \ 779 "forcing use of 64bit literal fixups") \ 780 \ 781 notproduct(bool, StressDerivedPointers, false, \ 782 "Force scavenge when a derived pointer is detected on stack " \ 783 "after rtm call") \ 784 \ 785 develop(bool, TraceDerivedPointers, false, \ 786 "Trace traversal of derived pointers on stack") \ 787 \ 788 notproduct(bool, TraceCodeBlobStacks, false, \ 789 "Trace stack-walk of codeblobs") \ 790 \ 791 product(bool, PrintJNIResolving, false, \ 792 "Used to implement -v:jni") \ 793 \ 794 notproduct(bool, PrintRewrites, false, \ 795 "Print methods that are being rewritten") \ 796 \ 797 product(bool, UseInlineCaches, true, \ 798 "Use Inline Caches for virtual calls ") \ 799 \ 800 develop(bool, InlineArrayCopy, true, \ 801 "Inline arraycopy native that is known to be part of " \ 802 "base library DLL") \ 803 \ 804 develop(bool, InlineObjectHash, true, \ 805 "Inline Object::hashCode() native that is known to be part " \ 806 "of base library DLL") \ 807 \ 808 develop(bool, InlineNatives, true, \ 809 "Inline natives that are known to be part of base library DLL") \ 810 \ 811 develop(bool, InlineMathNatives, true, \ 812 "Inline SinD, CosD, etc.") \ 813 \ 814 develop(bool, InlineClassNatives, true, \ 815 "Inline Class.isInstance, etc") \ 816 \ 817 develop(bool, InlineThreadNatives, true, \ 818 "Inline Thread.currentThread, etc") \ 819 \ 820 develop(bool, InlineUnsafeOps, true, \ 821 "Inline memory ops (native methods) from Unsafe") \ 822 \ 823 product(bool, CriticalJNINatives, true, \ 824 "Check for critical JNI entry points") \ 825 \ 826 notproduct(bool, StressCriticalJNINatives, false, \ 827 "Exercise register saving code in critical natives") \ 828 \ 829 product(bool, UseAESIntrinsics, false, \ 830 "Use intrinsics for AES versions of crypto") \ 831 \ 832 product(bool, UseAESCTRIntrinsics, false, \ 833 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 834 \ 835 product(bool, UseSHA1Intrinsics, false, \ 836 "Use intrinsics for SHA-1 crypto hash function. " \ 837 "Requires that UseSHA is enabled.") \ 838 \ 839 product(bool, UseSHA256Intrinsics, false, \ 840 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 841 "Requires that UseSHA is enabled.") \ 842 \ 843 product(bool, UseSHA512Intrinsics, false, \ 844 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 845 "Requires that UseSHA is enabled.") \ 846 \ 847 product(bool, UseCRC32Intrinsics, false, \ 848 "use intrinsics for java.util.zip.CRC32") \ 849 \ 850 product(bool, UseCRC32CIntrinsics, false, \ 851 "use intrinsics for java.util.zip.CRC32C") \ 852 \ 853 product(bool, UseAdler32Intrinsics, false, \ 854 "use intrinsics for java.util.zip.Adler32") \ 855 \ 856 product(bool, UseVectorizedMismatchIntrinsic, false, \ 857 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 858 \ 859 diagnostic(ccstrlist, DisableIntrinsic, "", \ 860 "do not expand intrinsics whose (internal) names appear here") \ 861 \ 862 develop(bool, TraceCallFixup, false, \ 863 "Trace all call fixups") \ 864 \ 865 develop(bool, DeoptimizeALot, false, \ 866 "Deoptimize at every exit from the runtime system") \ 867 \ 868 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 869 "A comma separated list of bcis to deoptimize at") \ 870 \ 871 product(bool, DeoptimizeRandom, false, \ 872 "Deoptimize random frames on random exit from the runtime system")\ 873 \ 874 notproduct(bool, ZombieALot, false, \ 875 "Create zombies (non-entrant) at exit from the runtime system") \ 876 \ 877 product(bool, UnlinkSymbolsALot, false, \ 878 "Unlink unreferenced symbols from the symbol table at safepoints")\ 879 \ 880 notproduct(bool, WalkStackALot, false, \ 881 "Trace stack (no print) at every exit from the runtime system") \ 882 \ 883 product(bool, Debugging, false, \ 884 "Set when executing debug methods in debug.cpp " \ 885 "(to prevent triggering assertions)") \ 886 \ 887 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 888 "Enable strict checks that safepoints cannot happen for threads " \ 889 "that use NoSafepointVerifier") \ 890 \ 891 notproduct(bool, VerifyLastFrame, false, \ 892 "Verify oops on last frame on entry to VM") \ 893 \ 894 product(bool, FailOverToOldVerifier, true, \ 895 "Fail over to old verifier when split verifier fails") \ 896 \ 897 develop(bool, ShowSafepointMsgs, false, \ 898 "Show message about safepoint synchronization") \ 899 \ 900 product(bool, SafepointTimeout, false, \ 901 "Time out and warn or fail after SafepointTimeoutDelay " \ 902 "milliseconds if failed to reach safepoint") \ 903 \ 904 develop(bool, DieOnSafepointTimeout, false, \ 905 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 906 \ 907 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 908 /* typically, at most a few retries are needed */ \ 909 product(intx, SuspendRetryCount, 50, \ 910 "Maximum retry count for an external suspend request") \ 911 range(0, max_intx) \ 912 \ 913 product(intx, SuspendRetryDelay, 5, \ 914 "Milliseconds to delay per retry (* current_retry_count)") \ 915 range(0, max_intx) \ 916 \ 917 product(bool, AssertOnSuspendWaitFailure, false, \ 918 "Assert/Guarantee on external suspend wait failure") \ 919 \ 920 product(bool, TraceSuspendWaitFailures, false, \ 921 "Trace external suspend wait failures") \ 922 \ 923 product(bool, MaxFDLimit, true, \ 924 "Bump the number of file descriptors to maximum in Solaris") \ 925 \ 926 diagnostic(bool, LogEvents, true, \ 927 "Enable the various ring buffer event logs") \ 928 \ 929 diagnostic(uintx, LogEventsBufferEntries, 10, \ 930 "Number of ring buffer event logs") \ 931 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 932 \ 933 product(bool, BytecodeVerificationRemote, true, \ 934 "Enable the Java bytecode verifier for remote classes") \ 935 \ 936 product(bool, BytecodeVerificationLocal, false, \ 937 "Enable the Java bytecode verifier for local classes") \ 938 \ 939 develop(bool, ForceFloatExceptions, trueInDebug, \ 940 "Force exceptions on FP stack under/overflow") \ 941 \ 942 develop(bool, VerifyStackAtCalls, false, \ 943 "Verify that the stack pointer is unchanged after calls") \ 944 \ 945 develop(bool, TraceJavaAssertions, false, \ 946 "Trace java language assertions") \ 947 \ 948 notproduct(bool, CheckAssertionStatusDirectives, false, \ 949 "Temporary - see javaClasses.cpp") \ 950 \ 951 notproduct(bool, PrintMallocFree, false, \ 952 "Trace calls to C heap malloc/free allocation") \ 953 \ 954 notproduct(bool, VerifyCodeCache, false, \ 955 "Verify code cache on memory allocation/deallocation") \ 956 \ 957 develop(bool, UseMallocOnly, false, \ 958 "Use only malloc/free for allocation (no resource area/arena)") \ 959 \ 960 develop(bool, PrintMalloc, false, \ 961 "Print all malloc/free calls") \ 962 \ 963 develop(bool, PrintMallocStatistics, false, \ 964 "Print malloc/free statistics") \ 965 \ 966 develop(bool, ZapResourceArea, trueInDebug, \ 967 "Zap freed resource/arena space with 0xABABABAB") \ 968 \ 969 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 970 "Zap freed VM handle space with 0xBCBCBCBC") \ 971 \ 972 develop(bool, ZapJNIHandleArea, trueInDebug, \ 973 "Zap freed JNI handle space with 0xFEFEFEFE") \ 974 \ 975 notproduct(bool, ZapStackSegments, trueInDebug, \ 976 "Zap allocated/freed stack segments with 0xFADFADED") \ 977 \ 978 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 979 "Zap unused heap space with 0xBAADBABE") \ 980 \ 981 develop(bool, CheckZapUnusedHeapArea, false, \ 982 "Check zapping of unused heap space") \ 983 \ 984 develop(bool, ZapFillerObjects, trueInDebug, \ 985 "Zap filler objects with 0xDEAFBABE") \ 986 \ 987 develop(bool, PrintVMMessages, true, \ 988 "Print VM messages on console") \ 989 \ 990 notproduct(uintx, ErrorHandlerTest, 0, \ 991 "If > 0, provokes an error after VM initialization; the value " \ 992 "determines which error to provoke. See test_error_handler() " \ 993 "in debug.cpp.") \ 994 \ 995 notproduct(uintx, TestCrashInErrorHandler, 0, \ 996 "If > 0, provokes an error inside VM error handler (a secondary " \ 997 "crash). see test_error_handler() in debug.cpp.") \ 998 \ 999 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1000 "If true, tests SafeFetch inside error handler.") \ 1001 \ 1002 develop(bool, Verbose, false, \ 1003 "Print additional debugging information from other modes") \ 1004 \ 1005 develop(bool, PrintMiscellaneous, false, \ 1006 "Print uncategorized debugging information (requires +Verbose)") \ 1007 \ 1008 develop(bool, WizardMode, false, \ 1009 "Print much more debugging information") \ 1010 \ 1011 product(bool, ShowMessageBoxOnError, false, \ 1012 "Keep process alive on VM fatal error") \ 1013 \ 1014 product(bool, CreateCoredumpOnCrash, true, \ 1015 "Create core/mini dump on VM fatal error") \ 1016 \ 1017 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 1018 "Timeout, in seconds, to limit the time spent on writing an " \ 1019 "error log in case of a crash.") \ 1020 range(0, (uint64_t)max_jlong/1000) \ 1021 \ 1022 product_pd(bool, UseOSErrorReporting, \ 1023 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1024 \ 1025 product(bool, SuppressFatalErrorMessage, false, \ 1026 "Report NO fatal error message (avoid deadlock)") \ 1027 \ 1028 product(ccstrlist, OnError, "", \ 1029 "Run user-defined commands on fatal error; see VMError.cpp " \ 1030 "for examples") \ 1031 \ 1032 product(ccstrlist, OnOutOfMemoryError, "", \ 1033 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1034 \ 1035 manageable(bool, HeapDumpBeforeFullGC, false, \ 1036 "Dump heap to file before any major stop-the-world GC") \ 1037 \ 1038 manageable(bool, HeapDumpAfterFullGC, false, \ 1039 "Dump heap to file after any major stop-the-world GC") \ 1040 \ 1041 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1042 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1043 \ 1044 manageable(ccstr, HeapDumpPath, NULL, \ 1045 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1046 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1047 "in the working directory)") \ 1048 \ 1049 develop(bool, BreakAtWarning, false, \ 1050 "Execute breakpoint upon encountering VM warning") \ 1051 \ 1052 develop(bool, UseFakeTimers, false, \ 1053 "Tell whether the VM should use system time or a fake timer") \ 1054 \ 1055 product(ccstr, NativeMemoryTracking, "off", \ 1056 "Native memory tracking options") \ 1057 \ 1058 diagnostic(bool, PrintNMTStatistics, false, \ 1059 "Print native memory tracking summary data if it is on") \ 1060 \ 1061 diagnostic(bool, LogCompilation, false, \ 1062 "Log compilation activity in detail to LogFile") \ 1063 \ 1064 product(bool, PrintCompilation, false, \ 1065 "Print compilations") \ 1066 \ 1067 diagnostic(bool, TraceNMethodInstalls, false, \ 1068 "Trace nmethod installation") \ 1069 \ 1070 diagnostic(intx, ScavengeRootsInCode, 2, \ 1071 "0: do not allow scavengable oops in the code cache; " \ 1072 "1: allow scavenging from the code cache; " \ 1073 "2: emit as many constants as the compiler can see") \ 1074 range(0, 2) \ 1075 \ 1076 product(bool, AlwaysRestoreFPU, false, \ 1077 "Restore the FPU control word after every JNI call (expensive)") \ 1078 \ 1079 diagnostic(bool, PrintCompilation2, false, \ 1080 "Print additional statistics per compilation") \ 1081 \ 1082 diagnostic(bool, PrintAdapterHandlers, false, \ 1083 "Print code generated for i2c/c2i adapters") \ 1084 \ 1085 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1086 "Verify that i2c/c2i adapters are called properly") \ 1087 \ 1088 develop(bool, VerifyAdapterSharing, false, \ 1089 "Verify that the code for shared adapters is the equivalent") \ 1090 \ 1091 diagnostic(bool, PrintAssembly, false, \ 1092 "Print assembly code (using external disassembler.so)") \ 1093 \ 1094 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1095 "Print options string passed to disassembler.so") \ 1096 \ 1097 notproduct(bool, PrintNMethodStatistics, false, \ 1098 "Print a summary statistic for the generated nmethods") \ 1099 \ 1100 diagnostic(bool, PrintNMethods, false, \ 1101 "Print assembly code for nmethods when generated") \ 1102 \ 1103 diagnostic(bool, PrintNativeNMethods, false, \ 1104 "Print assembly code for native nmethods when generated") \ 1105 \ 1106 develop(bool, PrintDebugInfo, false, \ 1107 "Print debug information for all nmethods when generated") \ 1108 \ 1109 develop(bool, PrintRelocations, false, \ 1110 "Print relocation information for all nmethods when generated") \ 1111 \ 1112 develop(bool, PrintDependencies, false, \ 1113 "Print dependency information for all nmethods when generated") \ 1114 \ 1115 develop(bool, PrintExceptionHandlers, false, \ 1116 "Print exception handler tables for all nmethods when generated") \ 1117 \ 1118 develop(bool, StressCompiledExceptionHandlers, false, \ 1119 "Exercise compiled exception handlers") \ 1120 \ 1121 develop(bool, InterceptOSException, false, \ 1122 "Start debugger when an implicit OS (e.g. NULL) " \ 1123 "exception happens") \ 1124 \ 1125 product(bool, PrintCodeCache, false, \ 1126 "Print the code cache memory usage when exiting") \ 1127 \ 1128 develop(bool, PrintCodeCache2, false, \ 1129 "Print detailed usage information on the code cache when exiting")\ 1130 \ 1131 product(bool, PrintCodeCacheOnCompilation, false, \ 1132 "Print the code cache memory usage each time a method is " \ 1133 "compiled") \ 1134 \ 1135 diagnostic(bool, PrintStubCode, false, \ 1136 "Print generated stub code") \ 1137 \ 1138 product(bool, StackTraceInThrowable, true, \ 1139 "Collect backtrace in throwable when exception happens") \ 1140 \ 1141 product(bool, OmitStackTraceInFastThrow, true, \ 1142 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1143 \ 1144 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1145 "Print bytecode statistics when dumping profiler output") \ 1146 \ 1147 product(bool, ProfilerRecordPC, false, \ 1148 "Collect ticks for each 16 byte interval of compiled code") \ 1149 \ 1150 product(bool, ProfileVM, false, \ 1151 "Profile ticks that fall within VM (either in the VM Thread " \ 1152 "or VM code called through stubs)") \ 1153 \ 1154 product(bool, ProfileIntervals, false, \ 1155 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1156 \ 1157 notproduct(bool, ProfilerCheckIntervals, false, \ 1158 "Collect and print information on spacing of profiler ticks") \ 1159 \ 1160 product(bool, PrintWarnings, true, \ 1161 "Print JVM warnings to output stream") \ 1162 \ 1163 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1164 "Print warnings for stalled SpinLocks") \ 1165 \ 1166 product(bool, RegisterFinalizersAtInit, true, \ 1167 "Register finalizable objects at end of Object.<init> or " \ 1168 "after allocation") \ 1169 \ 1170 develop(bool, RegisterReferences, true, \ 1171 "Tell whether the VM should register soft/weak/final/phantom " \ 1172 "references") \ 1173 \ 1174 develop(bool, IgnoreRewrites, false, \ 1175 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1176 "This is unsafe!") \ 1177 \ 1178 develop(bool, PrintCodeCacheExtension, false, \ 1179 "Print extension of code cache") \ 1180 \ 1181 develop(bool, UsePrivilegedStack, true, \ 1182 "Enable the security JVM functions") \ 1183 \ 1184 develop(bool, ProtectionDomainVerification, true, \ 1185 "Verify protection domain before resolution in system dictionary")\ 1186 \ 1187 product(bool, ClassUnloading, true, \ 1188 "Do unloading of classes") \ 1189 \ 1190 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1191 "Do unloading of classes with a concurrent marking cycle") \ 1192 \ 1193 develop(bool, DisableStartThread, false, \ 1194 "Disable starting of additional Java threads " \ 1195 "(for debugging only)") \ 1196 \ 1197 develop(bool, MemProfiling, false, \ 1198 "Write memory usage profiling to log file") \ 1199 \ 1200 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1201 "Print the system dictionary at exit") \ 1202 \ 1203 experimental(intx, PredictedLoadedClassCount, 0, \ 1204 "Experimental: Tune loaded class cache starting size") \ 1205 \ 1206 diagnostic(bool, UnsyncloadClass, false, \ 1207 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1208 "class loader must call VM synchronized for findClass " \ 1209 "and defineClass.") \ 1210 \ 1211 product(bool, AlwaysLockClassLoader, false, \ 1212 "Require the VM to acquire the class loader lock before calling " \ 1213 "loadClass() even for class loaders registering " \ 1214 "as parallel capable") \ 1215 \ 1216 product(bool, AllowParallelDefineClass, false, \ 1217 "Allow parallel defineClass requests for class loaders " \ 1218 "registering as parallel capable") \ 1219 \ 1220 product(bool, MustCallLoadClassInternal, false, \ 1221 "Call loadClassInternal() rather than loadClass()") \ 1222 \ 1223 product_pd(bool, DontYieldALot, \ 1224 "Throw away obvious excess yield calls") \ 1225 \ 1226 product(bool, ConvertSleepToYield, true, \ 1227 "Convert sleep(0) to thread yield ") \ 1228 \ 1229 product(bool, ConvertYieldToSleep, false, \ 1230 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1231 "behavior") \ 1232 \ 1233 develop(bool, UseDetachedThreads, true, \ 1234 "Use detached threads that are recycled upon termination " \ 1235 "(for Solaris only)") \ 1236 \ 1237 product(bool, UseLWPSynchronization, true, \ 1238 "Use LWP-based instead of libthread-based synchronization " \ 1239 "(SPARC only)") \ 1240 \ 1241 experimental(ccstr, SyncKnobs, NULL, \ 1242 "(Unstable) Various monitor synchronization tunables") \ 1243 \ 1244 experimental(intx, EmitSync, 0, \ 1245 "(Unsafe, Unstable) " \ 1246 "Control emission of inline sync fast-path code") \ 1247 \ 1248 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1249 range(0, max_jint) \ 1250 \ 1251 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1252 \ 1253 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1254 "Experimental Sync flags") \ 1255 \ 1256 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1257 \ 1258 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1259 \ 1260 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1261 \ 1262 experimental(intx, hashCode, 5, \ 1263 "(Unstable) select hashCode generation algorithm") \ 1264 \ 1265 product(bool, FilterSpuriousWakeups, true, \ 1266 "When true prevents OS-level spurious, or premature, wakeups " \ 1267 "from Object.wait (Ignored for Windows)") \ 1268 \ 1269 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1270 \ 1271 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1272 \ 1273 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1274 \ 1275 develop(bool, UsePthreads, false, \ 1276 "Use pthread-based instead of libthread-based synchronization " \ 1277 "(SPARC only)") \ 1278 \ 1279 product(bool, ReduceSignalUsage, false, \ 1280 "Reduce the use of OS signals in Java and/or the VM") \ 1281 \ 1282 develop_pd(bool, ShareVtableStubs, \ 1283 "Share vtable stubs (smaller code but worse branch prediction") \ 1284 \ 1285 develop(bool, LoadLineNumberTables, true, \ 1286 "Tell whether the class file parser loads line number tables") \ 1287 \ 1288 develop(bool, LoadLocalVariableTables, true, \ 1289 "Tell whether the class file parser loads local variable tables") \ 1290 \ 1291 develop(bool, LoadLocalVariableTypeTables, true, \ 1292 "Tell whether the class file parser loads local variable type" \ 1293 "tables") \ 1294 \ 1295 product(bool, AllowUserSignalHandlers, false, \ 1296 "Do not complain if the application installs signal handlers " \ 1297 "(Solaris & Linux only)") \ 1298 \ 1299 product(bool, UseSignalChaining, true, \ 1300 "Use signal-chaining to invoke signal handlers installed " \ 1301 "by the application (Solaris & Linux only)") \ 1302 \ 1303 product(bool, AllowJNIEnvProxy, false, \ 1304 "Allow JNIEnv proxies for jdbx") \ 1305 \ 1306 product(bool, RestoreMXCSROnJNICalls, false, \ 1307 "Restore MXCSR when returning from JNI calls") \ 1308 \ 1309 product(bool, CheckJNICalls, false, \ 1310 "Verify all arguments to JNI calls") \ 1311 \ 1312 product(bool, CheckEndorsedAndExtDirs, false, \ 1313 "Verify the endorsed and extension directories are not used") \ 1314 \ 1315 product(bool, UseFastJNIAccessors, true, \ 1316 "Use optimized versions of Get<Primitive>Field") \ 1317 \ 1318 product(intx, MaxJNILocalCapacity, 65536, \ 1319 "Maximum allowable local JNI handle capacity to " \ 1320 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1321 "where <= 0 is unlimited, default: 65536") \ 1322 range(min_intx, max_intx) \ 1323 \ 1324 product(bool, EagerXrunInit, false, \ 1325 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1326 "but not all -Xrun libraries may support the state of the VM " \ 1327 "at this time") \ 1328 \ 1329 product(bool, PreserveAllAnnotations, false, \ 1330 "Preserve RuntimeInvisibleAnnotations as well " \ 1331 "as RuntimeVisibleAnnotations") \ 1332 \ 1333 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1334 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1335 \ 1336 product(bool, UseXMMForArrayCopy, false, \ 1337 "Use SSE2 MOVQ instruction for Arraycopy") \ 1338 \ 1339 product(intx, FieldsAllocationStyle, 1, \ 1340 "0 - type based with oops first, " \ 1341 "1 - with oops last, " \ 1342 "2 - oops in super and sub classes are together") \ 1343 range(0, 2) \ 1344 \ 1345 product(bool, CompactFields, true, \ 1346 "Allocate nonstatic fields in gaps between previous fields") \ 1347 \ 1348 notproduct(bool, PrintFieldLayout, false, \ 1349 "Print field layout for each class") \ 1350 \ 1351 /* Need to limit the extent of the padding to reasonable size. */\ 1352 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1353 /* aggressive prefetching, while still leaving the room for segregating */\ 1354 /* among the distinct pages. */\ 1355 product(intx, ContendedPaddingWidth, 128, \ 1356 "How many bytes to pad the fields/classes marked @Contended with")\ 1357 range(0, 8192) \ 1358 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1359 \ 1360 product(bool, EnableContended, true, \ 1361 "Enable @Contended annotation support") \ 1362 \ 1363 product(bool, RestrictContended, true, \ 1364 "Restrict @Contended to trusted classes") \ 1365 \ 1366 product(bool, UseBiasedLocking, true, \ 1367 "Enable biased locking in JVM") \ 1368 \ 1369 product(intx, BiasedLockingStartupDelay, 4000, \ 1370 "Number of milliseconds to wait before enabling biased locking") \ 1371 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1372 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1373 \ 1374 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1375 "Print statistics of biased locking in JVM") \ 1376 \ 1377 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1378 "Threshold of number of revocations per type to try to " \ 1379 "rebias all objects in the heap of that type") \ 1380 range(0, max_intx) \ 1381 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1382 \ 1383 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1384 "Threshold of number of revocations per type to permanently " \ 1385 "revoke biases of all objects in the heap of that type") \ 1386 range(0, max_intx) \ 1387 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1388 \ 1389 product(intx, BiasedLockingDecayTime, 25000, \ 1390 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1391 "type after previous bulk rebias") \ 1392 range(500, max_intx) \ 1393 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1394 \ 1395 product(bool, ExitOnOutOfMemoryError, false, \ 1396 "JVM exits on the first occurrence of an out-of-memory error") \ 1397 \ 1398 product(bool, CrashOnOutOfMemoryError, false, \ 1399 "JVM aborts, producing an error log and core/mini dump, on the " \ 1400 "first occurrence of an out-of-memory error") \ 1401 \ 1402 /* tracing */ \ 1403 \ 1404 develop(bool, StressRewriter, false, \ 1405 "Stress linktime bytecode rewriting") \ 1406 \ 1407 product(ccstr, TraceJVMTI, NULL, \ 1408 "Trace flags for JVMTI functions and events") \ 1409 \ 1410 /* This option can change an EMCP method into an obsolete method. */ \ 1411 /* This can affect tests that except specific methods to be EMCP. */ \ 1412 /* This option should be used with caution. */ \ 1413 product(bool, StressLdcRewrite, false, \ 1414 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1415 \ 1416 product(uintx, TraceRedefineClasses, 0, \ 1417 "Trace level for JVMTI RedefineClasses") \ 1418 range(0, 0xFFFFFFFF) \ 1419 \ 1420 /* change to false by default sometime after Mustang */ \ 1421 product(bool, VerifyMergedCPBytecodes, true, \ 1422 "Verify bytecodes after RedefineClasses constant pool merging") \ 1423 \ 1424 develop(bool, TraceBytecodes, false, \ 1425 "Trace bytecode execution") \ 1426 \ 1427 develop(bool, TraceICs, false, \ 1428 "Trace inline cache changes") \ 1429 \ 1430 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1431 "Trace method invocation counter overflow") \ 1432 \ 1433 develop(bool, TraceInlineCacheClearing, false, \ 1434 "Trace clearing of inline caches in nmethods") \ 1435 \ 1436 develop(bool, TraceDependencies, false, \ 1437 "Trace dependencies") \ 1438 \ 1439 develop(bool, VerifyDependencies, trueInDebug, \ 1440 "Exercise and verify the compilation dependency mechanism") \ 1441 \ 1442 develop(bool, TraceNewOopMapGeneration, false, \ 1443 "Trace OopMapGeneration") \ 1444 \ 1445 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1446 "Trace OopMapGeneration: print detailed cell states") \ 1447 \ 1448 develop(bool, TimeOopMap, false, \ 1449 "Time calls to GenerateOopMap::compute_map() in sum") \ 1450 \ 1451 develop(bool, TimeOopMap2, false, \ 1452 "Time calls to GenerateOopMap::compute_map() individually") \ 1453 \ 1454 develop(bool, TraceMonitorMismatch, false, \ 1455 "Trace monitor matching failures during OopMapGeneration") \ 1456 \ 1457 develop(bool, TraceOopMapRewrites, false, \ 1458 "Trace rewriting of method oops during oop map generation") \ 1459 \ 1460 develop(bool, TraceICBuffer, false, \ 1461 "Trace usage of IC buffer") \ 1462 \ 1463 develop(bool, TraceCompiledIC, false, \ 1464 "Trace changes of compiled IC") \ 1465 \ 1466 /* gc */ \ 1467 \ 1468 product(bool, UseSerialGC, false, \ 1469 "Use the Serial garbage collector") \ 1470 \ 1471 product(bool, UseG1GC, false, \ 1472 "Use the Garbage-First garbage collector") \ 1473 \ 1474 product(bool, UseParallelGC, false, \ 1475 "Use the Parallel Scavenge garbage collector") \ 1476 \ 1477 product(bool, UseParallelOldGC, false, \ 1478 "Use the Parallel Old garbage collector") \ 1479 \ 1480 product(uintx, HeapMaximumCompactionInterval, 20, \ 1481 "How often should we maximally compact the heap (not allowing " \ 1482 "any dead space)") \ 1483 range(0, max_uintx) \ 1484 \ 1485 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1486 "The collection count for the first maximum compaction") \ 1487 range(0, max_uintx) \ 1488 \ 1489 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1490 "Use maximum compaction in the Parallel Old garbage collector " \ 1491 "for a system GC") \ 1492 \ 1493 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1494 "The mean used by the parallel compact dead wood " \ 1495 "limiter (a number between 0-100)") \ 1496 range(0, 100) \ 1497 \ 1498 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1499 "The standard deviation used by the parallel compact dead wood " \ 1500 "limiter (a number between 0-100)") \ 1501 range(0, 100) \ 1502 \ 1503 product(uint, ParallelGCThreads, 0, \ 1504 "Number of parallel threads parallel gc will use") \ 1505 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1506 \ 1507 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1508 "Use semaphore synchronization for the GC Threads, " \ 1509 "instead of synchronization based on mutexes") \ 1510 \ 1511 product(bool, UseDynamicNumberOfGCThreads, false, \ 1512 "Dynamically choose the number of parallel threads " \ 1513 "parallel gc will use") \ 1514 \ 1515 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1516 "Force dynamic selection of the number of " \ 1517 "parallel threads parallel gc will use to aid debugging") \ 1518 \ 1519 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1520 "Size of heap (bytes) per GC thread used in calculating the " \ 1521 "number of GC threads") \ 1522 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1523 \ 1524 product(uint, ConcGCThreads, 0, \ 1525 "Number of threads concurrent gc will use") \ 1526 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1527 \ 1528 product(uintx, GCTaskTimeStampEntries, 200, \ 1529 "Number of time stamp entries per gc worker thread") \ 1530 range(1, max_uintx) \ 1531 \ 1532 product(bool, AlwaysTenure, false, \ 1533 "Always tenure objects in eden (ParallelGC only)") \ 1534 \ 1535 product(bool, NeverTenure, false, \ 1536 "Never tenure objects in eden, may tenure on overflow " \ 1537 "(ParallelGC only)") \ 1538 \ 1539 product(bool, ScavengeBeforeFullGC, true, \ 1540 "Scavenge youngest generation before each full GC.") \ 1541 \ 1542 product(bool, UseConcMarkSweepGC, false, \ 1543 "Use Concurrent Mark-Sweep GC in the old generation") \ 1544 \ 1545 product(bool, ExplicitGCInvokesConcurrent, false, \ 1546 "A System.gc() request invokes a concurrent collection; " \ 1547 "(effective only when using concurrent collectors)") \ 1548 \ 1549 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1550 "A System.gc() request invokes a concurrent collection and " \ 1551 "also unloads classes during such a concurrent gc cycle " \ 1552 "(effective only when UseConcMarkSweepGC)") \ 1553 \ 1554 product(bool, GCLockerInvokesConcurrent, false, \ 1555 "The exit of a JNI critical section necessitating a scavenge, " \ 1556 "also kicks off a background concurrent collection") \ 1557 \ 1558 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1559 "How much the GC can expand the eden by while the GC locker " \ 1560 "is active (as a percentage)") \ 1561 range(0, 100) \ 1562 \ 1563 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1564 "Number of times to retry allocations when " \ 1565 "blocked by the GC locker") \ 1566 range(0, max_uintx) \ 1567 \ 1568 product(bool, UseCMSBestFit, true, \ 1569 "Use CMS best fit allocation strategy") \ 1570 \ 1571 product(bool, UseParNewGC, false, \ 1572 "Use parallel threads in the new generation") \ 1573 \ 1574 product(uintx, ParallelGCBufferWastePct, 10, \ 1575 "Wasted fraction of parallel allocation buffer") \ 1576 range(0, 100) \ 1577 \ 1578 product(uintx, TargetPLABWastePct, 10, \ 1579 "Target wasted space in last buffer as percent of overall " \ 1580 "allocation") \ 1581 range(1, 100) \ 1582 \ 1583 product(uintx, PLABWeight, 75, \ 1584 "Percentage (0-100) used to weight the current sample when " \ 1585 "computing exponentially decaying average for ResizePLAB") \ 1586 range(0, 100) \ 1587 \ 1588 product(bool, ResizePLAB, true, \ 1589 "Dynamically resize (survivor space) promotion LAB's") \ 1590 \ 1591 product(int, ParGCArrayScanChunk, 50, \ 1592 "Scan a subset of object array and push remainder, if array is " \ 1593 "bigger than this") \ 1594 range(1, max_jint/3) \ 1595 \ 1596 product(bool, ParGCUseLocalOverflow, false, \ 1597 "Instead of a global overflow list, use local overflow stacks") \ 1598 \ 1599 product(bool, ParGCTrimOverflow, true, \ 1600 "Eagerly trim the local overflow lists " \ 1601 "(when ParGCUseLocalOverflow)") \ 1602 \ 1603 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1604 "Simulate work queue overflow in ParNew") \ 1605 \ 1606 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1607 "An `interval' counter that determines how frequently " \ 1608 "we simulate overflow; a smaller number increases frequency") \ 1609 \ 1610 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1611 "The desired number of objects to claim from the overflow list") \ 1612 range(0, max_uintx) \ 1613 \ 1614 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1615 "The number of strides per worker thread that we divide up the " \ 1616 "card table scanning work into") \ 1617 range(1, max_uintx) \ 1618 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1619 \ 1620 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1621 "The number of cards in each chunk of the parallel chunks used " \ 1622 "during card table scanning") \ 1623 range(1, max_intx) \ 1624 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1625 \ 1626 product(uintx, OldPLABWeight, 50, \ 1627 "Percentage (0-100) used to weight the current sample when " \ 1628 "computing exponentially decaying average for resizing " \ 1629 "OldPLABSize") \ 1630 range(0, 100) \ 1631 \ 1632 product(bool, ResizeOldPLAB, true, \ 1633 "Dynamically resize (old gen) promotion LAB's") \ 1634 \ 1635 product(size_t, CMSOldPLABMax, 1024, \ 1636 "Maximum size of CMS gen promotion LAB caches per worker " \ 1637 "per block size") \ 1638 range(1, max_uintx) \ 1639 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1640 \ 1641 product(size_t, CMSOldPLABMin, 16, \ 1642 "Minimum size of CMS gen promotion LAB caches per worker " \ 1643 "per block size") \ 1644 range(1, max_uintx) \ 1645 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1646 \ 1647 product(uintx, CMSOldPLABNumRefills, 4, \ 1648 "Nominal number of refills of CMS gen promotion LAB cache " \ 1649 "per worker per block size") \ 1650 range(1, max_uintx) \ 1651 \ 1652 product(bool, CMSOldPLABResizeQuicker, false, \ 1653 "React on-the-fly during a scavenge to a sudden " \ 1654 "change in block demand rate") \ 1655 \ 1656 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1657 "The tolerance of the phase-change detector for on-the-fly " \ 1658 "PLAB resizing during a scavenge") \ 1659 range(1, max_uintx) \ 1660 \ 1661 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1662 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1663 "during a scavenge") \ 1664 range(1, max_uintx) \ 1665 \ 1666 product(bool, AlwaysPreTouch, false, \ 1667 "Force all freshly committed pages to be pre-touched") \ 1668 \ 1669 product_pd(size_t, CMSYoungGenPerWorker, \ 1670 "The maximum size of young gen chosen by default per GC worker " \ 1671 "thread available") \ 1672 range(1, max_uintx) \ 1673 \ 1674 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1675 "Percentage (0-100) used to add conservatism when computing the " \ 1676 "duty cycle") \ 1677 range(0, 100) \ 1678 \ 1679 product(uintx, CMSExpAvgFactor, 50, \ 1680 "Percentage (0-100) used to weight the current sample when " \ 1681 "computing exponential averages for CMS statistics") \ 1682 range(0, 100) \ 1683 \ 1684 product(uintx, CMS_FLSWeight, 75, \ 1685 "Percentage (0-100) used to weight the current sample when " \ 1686 "computing exponentially decaying averages for CMS FLS " \ 1687 "statistics") \ 1688 range(0, 100) \ 1689 \ 1690 product(uintx, CMS_FLSPadding, 1, \ 1691 "The multiple of deviation from mean to use for buffering " \ 1692 "against volatility in free list demand") \ 1693 range(0, max_juint) \ 1694 \ 1695 product(uintx, FLSCoalescePolicy, 2, \ 1696 "CMS: aggressiveness level for coalescing, increasing " \ 1697 "from 0 to 4") \ 1698 range(0, 4) \ 1699 \ 1700 product(bool, FLSAlwaysCoalesceLarge, false, \ 1701 "CMS: larger free blocks are always available for coalescing") \ 1702 \ 1703 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1704 "CMS: the smaller the percentage the greater the coalescing " \ 1705 "force") \ 1706 range(0.0, 1.0) \ 1707 \ 1708 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1709 "CMS: the factor by which to inflate estimated demand of small " \ 1710 "block sizes to prevent coalescing with an adjoining block") \ 1711 range(0.0, DBL_MAX) \ 1712 \ 1713 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1714 "CMS: the factor by which to inflate estimated demand of large " \ 1715 "block sizes to prevent coalescing with an adjoining block") \ 1716 range(0.0, DBL_MAX) \ 1717 \ 1718 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1719 "CMS: the factor by which to inflate estimated demand of small " \ 1720 "block sizes to prevent splitting to supply demand for smaller " \ 1721 "blocks") \ 1722 range(0.0, DBL_MAX) \ 1723 \ 1724 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1725 "CMS: the factor by which to inflate estimated demand of large " \ 1726 "block sizes to prevent splitting to supply demand for smaller " \ 1727 "blocks") \ 1728 range(0.0, DBL_MAX) \ 1729 \ 1730 product(bool, CMSExtrapolateSweep, false, \ 1731 "CMS: cushion for block demand during sweep") \ 1732 \ 1733 product(uintx, CMS_SweepWeight, 75, \ 1734 "Percentage (0-100) used to weight the current sample when " \ 1735 "computing exponentially decaying average for inter-sweep " \ 1736 "duration") \ 1737 range(0, 100) \ 1738 \ 1739 product(uintx, CMS_SweepPadding, 1, \ 1740 "The multiple of deviation from mean to use for buffering " \ 1741 "against volatility in inter-sweep duration") \ 1742 range(0, max_juint) \ 1743 \ 1744 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1745 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1746 "duration exceeds this threshold in milliseconds") \ 1747 range(0, max_uintx) \ 1748 \ 1749 product(bool, CMSClassUnloadingEnabled, true, \ 1750 "Whether class unloading enabled when using CMS GC") \ 1751 \ 1752 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1753 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1754 "count for which classes may not be unloaded") \ 1755 range(0, max_uintx) \ 1756 \ 1757 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1758 "Replenish an indexed free list with this number of chunks") \ 1759 range(1, max_uintx) \ 1760 \ 1761 product(bool, CMSReplenishIntermediate, true, \ 1762 "Replenish all intermediate free-list caches") \ 1763 \ 1764 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1765 "When satisfying batched demand, split blocks from the " \ 1766 "IndexedFreeList whose size is a multiple of requested size") \ 1767 \ 1768 product(bool, CMSLoopWarn, false, \ 1769 "Warn in case of excessive CMS looping") \ 1770 \ 1771 /* where does the range max value of (max_jint - 1) come from? */ \ 1772 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1773 "Maximum size of marking stack") \ 1774 range(1, (max_jint - 1)) \ 1775 \ 1776 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1777 "Size of marking stack") \ 1778 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1779 \ 1780 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1781 "Simulate frequent marking stack / work queue overflow") \ 1782 \ 1783 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1784 "An \"interval\" counter that determines how frequently " \ 1785 "to simulate overflow; a smaller number increases frequency") \ 1786 \ 1787 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1788 "Maximum number of abortable preclean iterations, if > 0") \ 1789 range(0, max_uintx) \ 1790 \ 1791 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1792 "Maximum time in abortable preclean (in milliseconds)") \ 1793 range(0, max_intx) \ 1794 \ 1795 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1796 "Nominal minimum work per abortable preclean iteration") \ 1797 range(0, max_uintx) \ 1798 \ 1799 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1800 "Time that we sleep between iterations when not given " \ 1801 "enough work per iteration") \ 1802 range(0, max_intx) \ 1803 \ 1804 product(size_t, CMSRescanMultiple, 32, \ 1805 "Size (in cards) of CMS parallel rescan task") \ 1806 range(1, max_uintx) \ 1807 \ 1808 product(size_t, CMSConcMarkMultiple, 32, \ 1809 "Size (in cards) of CMS concurrent MT marking task") \ 1810 range(1, max_uintx) \ 1811 \ 1812 product(bool, CMSAbortSemantics, false, \ 1813 "Whether abort-on-overflow semantics is implemented") \ 1814 \ 1815 product(bool, CMSParallelInitialMarkEnabled, true, \ 1816 "Use the parallel initial mark.") \ 1817 \ 1818 product(bool, CMSParallelRemarkEnabled, true, \ 1819 "Whether parallel remark enabled (only if ParNewGC)") \ 1820 \ 1821 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1822 "Whether parallel remark of survivor space " \ 1823 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1824 \ 1825 product(bool, CMSPLABRecordAlways, true, \ 1826 "Always record survivor space PLAB boundaries (effective only " \ 1827 "if CMSParallelSurvivorRemarkEnabled)") \ 1828 \ 1829 product(bool, CMSEdenChunksRecordAlways, true, \ 1830 "Always record eden chunks used for the parallel initial mark " \ 1831 "or remark of eden") \ 1832 \ 1833 product(bool, CMSConcurrentMTEnabled, true, \ 1834 "Whether multi-threaded concurrent work enabled " \ 1835 "(effective only if ParNewGC)") \ 1836 \ 1837 product(bool, CMSPrecleaningEnabled, true, \ 1838 "Whether concurrent precleaning enabled") \ 1839 \ 1840 product(uintx, CMSPrecleanIter, 3, \ 1841 "Maximum number of precleaning iteration passes") \ 1842 range(0, 9) \ 1843 \ 1844 product(uintx, CMSPrecleanDenominator, 3, \ 1845 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1846 "ratio") \ 1847 range(1, max_uintx) \ 1848 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1849 \ 1850 product(uintx, CMSPrecleanNumerator, 2, \ 1851 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1852 "ratio") \ 1853 range(0, max_uintx-1) \ 1854 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1855 \ 1856 product(bool, CMSPrecleanRefLists1, true, \ 1857 "Preclean ref lists during (initial) preclean phase") \ 1858 \ 1859 product(bool, CMSPrecleanRefLists2, false, \ 1860 "Preclean ref lists during abortable preclean phase") \ 1861 \ 1862 product(bool, CMSPrecleanSurvivors1, false, \ 1863 "Preclean survivors during (initial) preclean phase") \ 1864 \ 1865 product(bool, CMSPrecleanSurvivors2, true, \ 1866 "Preclean survivors during abortable preclean phase") \ 1867 \ 1868 product(uintx, CMSPrecleanThreshold, 1000, \ 1869 "Do not iterate again if number of dirty cards is less than this")\ 1870 range(100, max_uintx) \ 1871 \ 1872 product(bool, CMSCleanOnEnter, true, \ 1873 "Clean-on-enter optimization for reducing number of dirty cards") \ 1874 \ 1875 product(uintx, CMSRemarkVerifyVariant, 1, \ 1876 "Choose variant (1,2) of verification following remark") \ 1877 range(1, 2) \ 1878 \ 1879 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1880 "If Eden size is below this, do not try to schedule remark") \ 1881 range(0, max_uintx) \ 1882 \ 1883 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1884 "The Eden occupancy percentage (0-100) at which " \ 1885 "to try and schedule remark pause") \ 1886 range(0, 100) \ 1887 \ 1888 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1889 "Start sampling eden top at least before young gen " \ 1890 "occupancy reaches 1/<ratio> of the size at which " \ 1891 "we plan to schedule remark") \ 1892 range(1, max_uintx) \ 1893 \ 1894 product(uintx, CMSSamplingGrain, 16*K, \ 1895 "The minimum distance between eden samples for CMS (see above)") \ 1896 range(ObjectAlignmentInBytes, max_uintx) \ 1897 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1898 \ 1899 product(bool, CMSScavengeBeforeRemark, false, \ 1900 "Attempt scavenge before the CMS remark step") \ 1901 \ 1902 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1903 "Don't drain below this size per parallel worker/thief") \ 1904 range(1, max_juint) \ 1905 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1906 \ 1907 manageable(intx, CMSWaitDuration, 2000, \ 1908 "Time in milliseconds that CMS thread waits for young GC") \ 1909 range(min_jint, max_jint) \ 1910 \ 1911 develop(uintx, CMSCheckInterval, 1000, \ 1912 "Interval in milliseconds that CMS thread checks if it " \ 1913 "should start a collection cycle") \ 1914 \ 1915 product(bool, CMSYield, true, \ 1916 "Yield between steps of CMS") \ 1917 \ 1918 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1919 "Bitmap operations should process at most this many bits " \ 1920 "between yields") \ 1921 range(1, max_uintx) \ 1922 \ 1923 product(bool, CMSPrintChunksInDump, false, \ 1924 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1925 "trace level include more detailed information about the" \ 1926 "free chunks") \ 1927 \ 1928 product(bool, CMSPrintObjectsInDump, false, \ 1929 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1930 "trace level include more detailed information about the" \ 1931 "allocated objects") \ 1932 \ 1933 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1934 "Verify that all references across the FLS boundary " \ 1935 "are to valid objects") \ 1936 \ 1937 diagnostic(bool, FLSVerifyLists, false, \ 1938 "Do lots of (expensive) FreeListSpace verification") \ 1939 \ 1940 diagnostic(bool, FLSVerifyIndexTable, false, \ 1941 "Do lots of (expensive) FLS index table verification") \ 1942 \ 1943 develop(bool, FLSVerifyDictionary, false, \ 1944 "Do lots of (expensive) FLS dictionary verification") \ 1945 \ 1946 develop(bool, VerifyBlockOffsetArray, false, \ 1947 "Do (expensive) block offset array verification") \ 1948 \ 1949 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1950 "Maintain _unallocated_block in BlockOffsetArray " \ 1951 "(currently applicable only to CMS collector)") \ 1952 \ 1953 product(intx, RefDiscoveryPolicy, 0, \ 1954 "Select type of reference discovery policy: " \ 1955 "reference-based(0) or referent-based(1)") \ 1956 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1957 ReferenceProcessor::DiscoveryPolicyMax) \ 1958 \ 1959 product(bool, ParallelRefProcEnabled, false, \ 1960 "Enable parallel reference processing whenever possible") \ 1961 \ 1962 product(bool, ParallelRefProcBalancingEnabled, true, \ 1963 "Enable balancing of reference processing queues") \ 1964 \ 1965 product(uintx, CMSTriggerRatio, 80, \ 1966 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1967 "allocated before a CMS collection cycle commences") \ 1968 range(0, 100) \ 1969 \ 1970 product(uintx, CMSBootstrapOccupancy, 50, \ 1971 "Percentage CMS generation occupancy at which to " \ 1972 "initiate CMS collection for bootstrapping collection stats") \ 1973 range(0, 100) \ 1974 \ 1975 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1976 "Percentage CMS generation occupancy to start a CMS collection " \ 1977 "cycle. A negative value means that CMSTriggerRatio is used") \ 1978 range(min_intx, 100) \ 1979 \ 1980 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1981 "The percent occupancy (IHOP) of the current old generation " \ 1982 "capacity above which a concurrent mark cycle will be initiated " \ 1983 "Its value may change over time if adaptive IHOP is enabled, " \ 1984 "otherwise the value remains constant. " \ 1985 "In the latter case a value of 0 will result as frequent as " \ 1986 "possible concurrent marking cycles. A value of 100 disables " \ 1987 "concurrent marking. " \ 1988 "Fragmentation waste in the old generation is not considered " \ 1989 "free space in this calculation. (G1 collector only)") \ 1990 range(0, 100) \ 1991 \ 1992 manageable(intx, CMSTriggerInterval, -1, \ 1993 "Commence a CMS collection cycle (at least) every so many " \ 1994 "milliseconds (0 permanently, -1 disabled)") \ 1995 range(-1, max_intx) \ 1996 \ 1997 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1998 "Only use occupancy as a criterion for starting a CMS collection")\ 1999 \ 2000 product(uintx, CMSIsTooFullPercentage, 98, \ 2001 "An absolute ceiling above which CMS will always consider the " \ 2002 "unloading of classes when class unloading is enabled") \ 2003 range(0, 100) \ 2004 \ 2005 develop(bool, CMSTestInFreeList, false, \ 2006 "Check if the coalesced range is already in the " \ 2007 "free lists as claimed") \ 2008 \ 2009 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2010 "Check that all the garbage collected was returned to the " \ 2011 "free lists") \ 2012 \ 2013 notproduct(bool, ScavengeALot, false, \ 2014 "Force scavenge at every Nth exit from the runtime system " \ 2015 "(N=ScavengeALotInterval)") \ 2016 \ 2017 develop(bool, FullGCALot, false, \ 2018 "Force full gc at every Nth exit from the runtime system " \ 2019 "(N=FullGCALotInterval)") \ 2020 \ 2021 notproduct(bool, GCALotAtAllSafepoints, false, \ 2022 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2023 \ 2024 notproduct(bool, PromotionFailureALot, false, \ 2025 "Use promotion failure handling on every youngest generation " \ 2026 "collection") \ 2027 \ 2028 develop(uintx, PromotionFailureALotCount, 1000, \ 2029 "Number of promotion failures occurring at PLAB " \ 2030 "refill attempts (ParNew) or promotion attempts " \ 2031 "(other young collectors)") \ 2032 \ 2033 develop(uintx, PromotionFailureALotInterval, 5, \ 2034 "Total collections between promotion failures a lot") \ 2035 \ 2036 experimental(uintx, WorkStealingSleepMillis, 1, \ 2037 "Sleep time when sleep is used for yields") \ 2038 \ 2039 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2040 "Number of yields before a sleep is done during work stealing") \ 2041 \ 2042 experimental(uintx, WorkStealingHardSpins, 4096, \ 2043 "Number of iterations in a spin loop between checks on " \ 2044 "time out of hard spin") \ 2045 \ 2046 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2047 "Ratio of hard spins to calls to yield") \ 2048 \ 2049 develop(uintx, ObjArrayMarkingStride, 512, \ 2050 "Number of object array elements to push onto the marking stack " \ 2051 "before pushing a continuation entry") \ 2052 \ 2053 develop(bool, MetadataAllocationFailALot, false, \ 2054 "Fail metadata allocations at intervals controlled by " \ 2055 "MetadataAllocationFailALotInterval") \ 2056 \ 2057 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2058 "Metadata allocation failure a lot interval") \ 2059 \ 2060 notproduct(bool, ExecuteInternalVMTests, false, \ 2061 "Enable execution of internal VM tests") \ 2062 \ 2063 notproduct(bool, VerboseInternalVMTests, false, \ 2064 "Turn on logging for internal VM tests.") \ 2065 \ 2066 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2067 \ 2068 product_pd(bool, ResizeTLAB, \ 2069 "Dynamically resize TLAB size for threads") \ 2070 \ 2071 product(bool, ZeroTLAB, false, \ 2072 "Zero out the newly created TLAB") \ 2073 \ 2074 product(bool, FastTLABRefill, true, \ 2075 "Use fast TLAB refill code") \ 2076 \ 2077 product(bool, TLABStats, true, \ 2078 "Provide more detailed and expensive TLAB statistics.") \ 2079 \ 2080 product_pd(bool, NeverActAsServerClassMachine, \ 2081 "Never act like a server-class machine") \ 2082 \ 2083 product(bool, AlwaysActAsServerClassMachine, false, \ 2084 "Always act like a server-class machine") \ 2085 \ 2086 product_pd(uint64_t, MaxRAM, \ 2087 "Real memory size (in bytes) used to set maximum heap size") \ 2088 range(0, 0XFFFFFFFFFFFFFFFF) \ 2089 \ 2090 product(size_t, ErgoHeapSizeLimit, 0, \ 2091 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2092 "MaxRAM / MaxRAMFraction") \ 2093 range(0, max_uintx) \ 2094 \ 2095 product(uintx, MaxRAMFraction, 4, \ 2096 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2097 "size") \ 2098 range(1, max_uintx) \ 2099 \ 2100 product(uintx, MinRAMFraction, 2, \ 2101 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2102 "size on systems with small physical memory size") \ 2103 range(1, max_uintx) \ 2104 \ 2105 product(uintx, InitialRAMFraction, 64, \ 2106 "Fraction (1/n) of real memory used for initial heap size") \ 2107 range(1, max_uintx) \ 2108 \ 2109 develop(uintx, MaxVirtMemFraction, 2, \ 2110 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2111 "determining maximum heap size") \ 2112 \ 2113 product(bool, UseAutoGCSelectPolicy, false, \ 2114 "Use automatic collection selection policy") \ 2115 \ 2116 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2117 "Automatic GC selection pause threshold in milliseconds") \ 2118 range(0, max_uintx) \ 2119 \ 2120 product(bool, UseAdaptiveSizePolicy, true, \ 2121 "Use adaptive generation sizing policies") \ 2122 \ 2123 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2124 "Use adaptive survivor sizing policies") \ 2125 \ 2126 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2127 "Use adaptive young-old sizing policies at minor collections") \ 2128 \ 2129 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2130 "Use adaptive young-old sizing policies at major collections") \ 2131 \ 2132 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2133 "Include statistics from System.gc() for adaptive size policy") \ 2134 \ 2135 product(bool, UseAdaptiveGCBoundary, false, \ 2136 "Allow young-old boundary to move") \ 2137 \ 2138 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2139 "Resize the virtual spaces of the young or old generations") \ 2140 range(-1, 1) \ 2141 \ 2142 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2143 "Policy for changing generation size for throughput goals") \ 2144 range(0, 1) \ 2145 \ 2146 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2147 "Number of steps where heuristics is used before data is used") \ 2148 range(0, max_uintx) \ 2149 \ 2150 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2151 "Number of collections before the adaptive sizing is started") \ 2152 \ 2153 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2154 "Collection interval for printing information; zero means never") \ 2155 range(0, max_uintx) \ 2156 \ 2157 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2158 "Use adaptive minimum footprint as a goal") \ 2159 \ 2160 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2161 "Weight given to exponential resizing, between 0 and 100") \ 2162 range(0, 100) \ 2163 \ 2164 product(uintx, AdaptiveTimeWeight, 25, \ 2165 "Weight given to time in adaptive policy, between 0 and 100") \ 2166 range(0, 100) \ 2167 \ 2168 product(uintx, PausePadding, 1, \ 2169 "How much buffer to keep for pause time") \ 2170 range(0, max_juint) \ 2171 \ 2172 product(uintx, PromotedPadding, 3, \ 2173 "How much buffer to keep for promotion failure") \ 2174 range(0, max_juint) \ 2175 \ 2176 product(uintx, SurvivorPadding, 3, \ 2177 "How much buffer to keep for survivor overflow") \ 2178 range(0, max_juint) \ 2179 \ 2180 product(uintx, ThresholdTolerance, 10, \ 2181 "Allowed collection cost difference between generations") \ 2182 range(0, 100) \ 2183 \ 2184 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2185 "If collection costs are within margin, reduce both by full " \ 2186 "delta") \ 2187 range(0, 100) \ 2188 \ 2189 product(uintx, YoungGenerationSizeIncrement, 20, \ 2190 "Adaptive size percentage change in young generation") \ 2191 range(0, 100) \ 2192 \ 2193 product(uintx, YoungGenerationSizeSupplement, 80, \ 2194 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2195 range(0, 100) \ 2196 \ 2197 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2198 "Decay factor to YoungedGenerationSizeSupplement") \ 2199 range(1, max_uintx) \ 2200 \ 2201 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2202 "Adaptive size percentage change in tenured generation") \ 2203 range(0, 100) \ 2204 \ 2205 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2206 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2207 range(0, 100) \ 2208 \ 2209 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2210 "Decay factor to TenuredGenerationSizeIncrement") \ 2211 range(1, max_uintx) \ 2212 \ 2213 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2214 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2215 "or (G1 Only) the maximum GC time per MMU time slice") \ 2216 range(1, max_uintx - 1) \ 2217 constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit) \ 2218 \ 2219 product(uintx, GCPauseIntervalMillis, 0, \ 2220 "Time slice for MMU specification") \ 2221 constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit) \ 2222 \ 2223 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2224 "Adaptive size policy maximum GC minor pause time goal " \ 2225 "in millisecond") \ 2226 range(0, max_uintx) \ 2227 \ 2228 product(uintx, GCTimeRatio, 99, \ 2229 "Adaptive size policy application time to GC time ratio") \ 2230 range(0, max_juint) \ 2231 \ 2232 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2233 "Adaptive size scale down factor for shrinking") \ 2234 range(1, max_uintx) \ 2235 \ 2236 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2237 "Adaptive size decays the major cost for long major intervals") \ 2238 \ 2239 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2240 "Time scale over which major costs decay") \ 2241 range(0, max_uintx) \ 2242 \ 2243 product(uintx, MinSurvivorRatio, 3, \ 2244 "Minimum ratio of young generation/survivor space size") \ 2245 range(3, max_uintx) \ 2246 \ 2247 product(uintx, InitialSurvivorRatio, 8, \ 2248 "Initial ratio of young generation/survivor space size") \ 2249 range(0, max_uintx) \ 2250 \ 2251 product(size_t, BaseFootPrintEstimate, 256*M, \ 2252 "Estimate of footprint other than Java Heap") \ 2253 range(0, max_uintx) \ 2254 \ 2255 product(bool, UseGCOverheadLimit, true, \ 2256 "Use policy to limit of proportion of time spent in GC " \ 2257 "before an OutOfMemory error is thrown") \ 2258 \ 2259 product(uintx, GCTimeLimit, 98, \ 2260 "Limit of the proportion of time spent in GC before " \ 2261 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2262 range(0, 100) \ 2263 \ 2264 product(uintx, GCHeapFreeLimit, 2, \ 2265 "Minimum percentage of free space after a full GC before an " \ 2266 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2267 range(0, 100) \ 2268 \ 2269 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2270 "Number of consecutive collections before gc time limit fires") \ 2271 range(1, max_uintx) \ 2272 \ 2273 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2274 "How far ahead to prefetch destination area (<= 0 means off)") \ 2275 range(-1, max_jint) \ 2276 \ 2277 product(intx, PrefetchScanIntervalInBytes, -1, \ 2278 "How far ahead to prefetch scan area (<= 0 means off)") \ 2279 range(-1, max_jint) \ 2280 \ 2281 product(intx, PrefetchFieldsAhead, -1, \ 2282 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2283 range(-1, max_jint) \ 2284 \ 2285 diagnostic(bool, VerifyDuringStartup, false, \ 2286 "Verify memory system before executing any Java code " \ 2287 "during VM initialization") \ 2288 \ 2289 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2290 "Verify system before exiting") \ 2291 \ 2292 diagnostic(bool, VerifyBeforeGC, false, \ 2293 "Verify memory system before GC") \ 2294 \ 2295 diagnostic(bool, VerifyAfterGC, false, \ 2296 "Verify memory system after GC") \ 2297 \ 2298 diagnostic(bool, VerifyDuringGC, false, \ 2299 "Verify memory system during GC (between phases)") \ 2300 \ 2301 diagnostic(ccstrlist, VerifySubSet, "", \ 2302 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2303 "are enabled. One or more sub-systems can be specified " \ 2304 "in a comma separated string. Sub-systems are: " \ 2305 "threads, heap, symbol_table, string_table, codecache, " \ 2306 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2307 "c-heap, codecache_oops") \ 2308 \ 2309 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2310 "Enable parallel memory system verification") \ 2311 \ 2312 diagnostic(bool, DeferInitialCardMark, false, \ 2313 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2314 "may arise from new_pre_store_barrier") \ 2315 \ 2316 product(bool, UseCondCardMark, false, \ 2317 "Check for already marked card before updating card table") \ 2318 \ 2319 diagnostic(bool, VerifyRememberedSets, false, \ 2320 "Verify GC remembered sets") \ 2321 \ 2322 diagnostic(bool, VerifyObjectStartArray, true, \ 2323 "Verify GC object start array if verify before/after") \ 2324 \ 2325 product(bool, DisableExplicitGC, false, \ 2326 "Ignore calls to System.gc()") \ 2327 \ 2328 notproduct(bool, CheckMemoryInitialization, false, \ 2329 "Check memory initialization") \ 2330 \ 2331 diagnostic(bool, BindCMSThreadToCPU, false, \ 2332 "Bind CMS Thread to CPU if possible") \ 2333 \ 2334 diagnostic(uintx, CPUForCMSThread, 0, \ 2335 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2336 range(0, max_juint) \ 2337 \ 2338 product(bool, BindGCTaskThreadsToCPUs, false, \ 2339 "Bind GCTaskThreads to CPUs if possible") \ 2340 \ 2341 product(bool, UseGCTaskAffinity, false, \ 2342 "Use worker affinity when asking for GCTasks") \ 2343 \ 2344 product(uintx, ProcessDistributionStride, 4, \ 2345 "Stride through processors when distributing processes") \ 2346 range(0, max_juint) \ 2347 \ 2348 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2349 "Number of times the coordinator GC thread will sleep while " \ 2350 "yielding before giving up and resuming GC") \ 2351 range(0, max_juint) \ 2352 \ 2353 product(uintx, CMSYieldSleepCount, 0, \ 2354 "Number of times a GC thread (minus the coordinator) " \ 2355 "will sleep while yielding before giving up and resuming GC") \ 2356 range(0, max_juint) \ 2357 \ 2358 product(bool, PrintGC, false, \ 2359 "Print message at garbage collection. " \ 2360 "Deprecated, use -Xlog:gc instead.") \ 2361 \ 2362 product(bool, PrintGCDetails, false, \ 2363 "Print more details at garbage collection. " \ 2364 "Deprecated, use -Xlog:gc* instead.") \ 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_rw(bool, TraceLoaderConstraints, false, \ 2381 "Trace loader constraints") \ 2382 \ 2383 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2384 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2385 "Initial size of the boot class loader data metaspace") \ 2386 range(30*K, max_uintx/BytesPerWord) \ 2387 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2388 \ 2389 product(bool, TraceYoungGenTime, false, \ 2390 "Trace accumulated time for young collection") \ 2391 \ 2392 product(bool, TraceOldGenTime, false, \ 2393 "Trace accumulated time for old collection") \ 2394 \ 2395 product(bool, PrintHeapAtSIGBREAK, true, \ 2396 "Print heap layout in response to SIGBREAK") \ 2397 \ 2398 manageable(bool, PrintClassHistogram, false, \ 2399 "Print a histogram of class instances") \ 2400 \ 2401 develop(bool, TraceWorkGang, false, \ 2402 "Trace activities of work gangs") \ 2403 \ 2404 develop(bool, TraceGCTaskManager, false, \ 2405 "Trace actions of the GC task manager") \ 2406 \ 2407 develop(bool, TraceGCTaskQueue, false, \ 2408 "Trace actions of the GC task queues") \ 2409 \ 2410 diagnostic(bool, TraceGCTaskThread, false, \ 2411 "Trace actions of the GC task threads") \ 2412 \ 2413 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2414 "Trace marking phase in ParallelOldGC") \ 2415 \ 2416 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2417 "Trace dense prefix computation for ParallelOldGC") \ 2418 \ 2419 develop(bool, IgnoreLibthreadGPFault, false, \ 2420 "Suppress workaround for libthread GP fault") \ 2421 \ 2422 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2423 "The percentage of the used heap that the instances of a class " \ 2424 "must occupy for the class to generate a trace event") \ 2425 range(0.0, 100.0) \ 2426 \ 2427 /* JVMTI heap profiling */ \ 2428 \ 2429 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2430 "Trace JVMTI object tagging calls") \ 2431 \ 2432 diagnostic(bool, VerifyBeforeIteration, false, \ 2433 "Verify memory system before JVMTI iteration") \ 2434 \ 2435 /* compiler interface */ \ 2436 \ 2437 develop(bool, CIPrintCompilerName, false, \ 2438 "when CIPrint is active, print the name of the active compiler") \ 2439 \ 2440 diagnostic(bool, CIPrintCompileQueue, false, \ 2441 "display the contents of the compile queue whenever a " \ 2442 "compilation is enqueued") \ 2443 \ 2444 develop(bool, CIPrintRequests, false, \ 2445 "display every request for compilation") \ 2446 \ 2447 product(bool, CITime, false, \ 2448 "collect timing information for compilation") \ 2449 \ 2450 develop(bool, CITimeVerbose, false, \ 2451 "be more verbose in compilation timings") \ 2452 \ 2453 develop(bool, CITimeEach, false, \ 2454 "display timing information after each successful compilation") \ 2455 \ 2456 develop(bool, CICountOSR, false, \ 2457 "use a separate counter when assigning ids to osr compilations") \ 2458 \ 2459 develop(bool, CICompileNatives, true, \ 2460 "compile native methods if supported by the compiler") \ 2461 \ 2462 develop_pd(bool, CICompileOSR, \ 2463 "compile on stack replacement methods if supported by the " \ 2464 "compiler") \ 2465 \ 2466 develop(bool, CIPrintMethodCodes, false, \ 2467 "print method bytecodes of the compiled code") \ 2468 \ 2469 develop(bool, CIPrintTypeFlow, false, \ 2470 "print the results of ciTypeFlow analysis") \ 2471 \ 2472 develop(bool, CITraceTypeFlow, false, \ 2473 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2474 \ 2475 develop(intx, OSROnlyBCI, -1, \ 2476 "OSR only at this bci. Negative values mean exclude that bci") \ 2477 \ 2478 /* compiler */ \ 2479 \ 2480 /* notice: the max range value here is max_jint, not max_intx */ \ 2481 /* because of overflow issue */ \ 2482 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2483 "Number of compiler threads to run") \ 2484 range(0, max_jint) \ 2485 constraint(CICompilerCountConstraintFunc, AtParse) \ 2486 \ 2487 product(intx, CompilationPolicyChoice, 0, \ 2488 "which compilation policy (0-3)") \ 2489 range(0, 3) \ 2490 \ 2491 develop(bool, UseStackBanging, true, \ 2492 "use stack banging for stack overflow checks (required for " \ 2493 "proper StackOverflow handling; disable only to measure cost " \ 2494 "of stackbanging)") \ 2495 \ 2496 develop(bool, UseStrictFP, true, \ 2497 "use strict fp if modifier strictfp is set") \ 2498 \ 2499 develop(bool, GenerateSynchronizationCode, true, \ 2500 "generate locking/unlocking code for synchronized methods and " \ 2501 "monitors") \ 2502 \ 2503 develop(bool, GenerateCompilerNullChecks, true, \ 2504 "Generate explicit null checks for loads/stores/calls") \ 2505 \ 2506 develop(bool, GenerateRangeChecks, true, \ 2507 "Generate range checks for array accesses") \ 2508 \ 2509 develop_pd(bool, ImplicitNullChecks, \ 2510 "Generate code for implicit null checks") \ 2511 \ 2512 product_pd(bool, TrapBasedNullChecks, \ 2513 "Generate code for null checks that uses a cmp and trap " \ 2514 "instruction raising SIGTRAP. This is only used if an access to" \ 2515 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2516 "ImplicitNullChecks don't work (PPC64).") \ 2517 \ 2518 product(bool, PrintSafepointStatistics, false, \ 2519 "Print statistics about safepoint synchronization") \ 2520 \ 2521 product(intx, PrintSafepointStatisticsCount, 300, \ 2522 "Total number of safepoint statistics collected " \ 2523 "before printing them out") \ 2524 range(1, max_intx) \ 2525 \ 2526 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2527 "Print safepoint statistics only when safepoint takes " \ 2528 "more than PrintSafepointSatisticsTimeout in millis") \ 2529 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2530 NOT_LP64(range(-1, max_intx)) \ 2531 \ 2532 product(bool, Inline, true, \ 2533 "Enable inlining") \ 2534 \ 2535 product(bool, ClipInlining, true, \ 2536 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2537 \ 2538 develop(bool, UseCHA, true, \ 2539 "Enable CHA") \ 2540 \ 2541 product(bool, UseTypeProfile, true, \ 2542 "Check interpreter profile for historically monomorphic calls") \ 2543 \ 2544 diagnostic(bool, PrintInlining, false, \ 2545 "Print inlining optimizations") \ 2546 \ 2547 product(bool, UsePopCountInstruction, false, \ 2548 "Use population count instruction") \ 2549 \ 2550 develop(bool, EagerInitialization, false, \ 2551 "Eagerly initialize classes if possible") \ 2552 \ 2553 diagnostic(bool, LogTouchedMethods, false, \ 2554 "Log methods which have been ever touched in runtime") \ 2555 \ 2556 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2557 "Print all methods that have been ever touched in runtime") \ 2558 \ 2559 develop(bool, TraceMethodReplacement, false, \ 2560 "Print when methods are replaced do to recompilation") \ 2561 \ 2562 develop(bool, PrintMethodFlushing, false, \ 2563 "Print the nmethods being flushed") \ 2564 \ 2565 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2566 "print statistics about method flushing") \ 2567 \ 2568 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2569 "Number of compiled code invocations after which " \ 2570 "the method is considered as hot by the flusher") \ 2571 range(1, max_jint) \ 2572 \ 2573 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2574 "Minimum number of sweeper passes before an nmethod " \ 2575 "can be flushed") \ 2576 range(0, max_intx) \ 2577 \ 2578 product(bool, UseCodeAging, true, \ 2579 "Insert counter to detect warm methods") \ 2580 \ 2581 diagnostic(bool, StressCodeAging, false, \ 2582 "Start with counters compiled in") \ 2583 \ 2584 develop(bool, UseRelocIndex, false, \ 2585 "Use an index to speed random access to relocations") \ 2586 \ 2587 develop(bool, StressCodeBuffers, false, \ 2588 "Exercise code buffer expansion and other rare state changes") \ 2589 \ 2590 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2591 "Generate extra debugging information for non-safepoints in " \ 2592 "nmethods") \ 2593 \ 2594 product(bool, PrintVMOptions, false, \ 2595 "Print flags that appeared on the command line") \ 2596 \ 2597 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2598 "Ignore unrecognized VM options") \ 2599 \ 2600 product(bool, PrintCommandLineFlags, false, \ 2601 "Print flags specified on command line or set by ergonomics") \ 2602 \ 2603 product(bool, PrintFlagsInitial, false, \ 2604 "Print all VM flags before argument processing and exit VM") \ 2605 \ 2606 product(bool, PrintFlagsFinal, false, \ 2607 "Print all VM flags after argument and ergonomic processing") \ 2608 \ 2609 notproduct(bool, PrintFlagsWithComments, false, \ 2610 "Print all VM flags with default values and descriptions and " \ 2611 "exit") \ 2612 \ 2613 product(bool, PrintFlagsRanges, false, \ 2614 "Print VM flags and their ranges and exit VM") \ 2615 \ 2616 diagnostic(bool, SerializeVMOutput, true, \ 2617 "Use a mutex to serialize output to tty and LogFile") \ 2618 \ 2619 diagnostic(bool, DisplayVMOutput, true, \ 2620 "Display all VM output on the tty, independently of LogVMOutput") \ 2621 \ 2622 diagnostic(bool, LogVMOutput, false, \ 2623 "Save VM output to LogFile") \ 2624 \ 2625 diagnostic(ccstr, LogFile, NULL, \ 2626 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2627 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2628 \ 2629 product(ccstr, ErrorFile, NULL, \ 2630 "If an error occurs, save the error data to this file " \ 2631 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2632 \ 2633 product(bool, DisplayVMOutputToStderr, false, \ 2634 "If DisplayVMOutput is true, display all VM output to stderr") \ 2635 \ 2636 product(bool, DisplayVMOutputToStdout, false, \ 2637 "If DisplayVMOutput is true, display all VM output to stdout") \ 2638 \ 2639 product(bool, UseHeavyMonitors, false, \ 2640 "use heavyweight instead of lightweight Java monitors") \ 2641 \ 2642 product(bool, PrintStringTableStatistics, false, \ 2643 "print statistics about the StringTable and SymbolTable") \ 2644 \ 2645 diagnostic(bool, VerifyStringTableAtExit, false, \ 2646 "verify StringTable contents at exit") \ 2647 \ 2648 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2649 "print histogram of the symbol table") \ 2650 \ 2651 notproduct(bool, ExitVMOnVerifyError, false, \ 2652 "standard exit from VM if bytecode verify error " \ 2653 "(only in debug mode)") \ 2654 \ 2655 diagnostic(ccstr, AbortVMOnException, NULL, \ 2656 "Call fatal if this exception is thrown. Example: " \ 2657 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2658 \ 2659 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2660 "Call fatal if the exception pointed by AbortVMOnException " \ 2661 "has this message") \ 2662 \ 2663 develop(bool, DebugVtables, false, \ 2664 "add debugging code to vtable dispatch") \ 2665 \ 2666 notproduct(bool, PrintVtableStats, false, \ 2667 "print vtables stats at end of run") \ 2668 \ 2669 develop(bool, TraceCreateZombies, false, \ 2670 "trace creation of zombie nmethods") \ 2671 \ 2672 notproduct(bool, IgnoreLockingAssertions, false, \ 2673 "disable locking assertions (for speed)") \ 2674 \ 2675 product(bool, RangeCheckElimination, true, \ 2676 "Eliminate range checks") \ 2677 \ 2678 develop_pd(bool, UncommonNullCast, \ 2679 "track occurrences of null in casts; adjust compiler tactics") \ 2680 \ 2681 develop(bool, TypeProfileCasts, true, \ 2682 "treat casts like calls for purposes of type profiling") \ 2683 \ 2684 develop(bool, DelayCompilationDuringStartup, true, \ 2685 "Delay invoking the compiler until main application class is " \ 2686 "loaded") \ 2687 \ 2688 develop(bool, CompileTheWorld, false, \ 2689 "Compile all methods in all classes in bootstrap class path " \ 2690 "(stress test)") \ 2691 \ 2692 develop(bool, CompileTheWorldPreloadClasses, true, \ 2693 "Preload all classes used by a class before start loading") \ 2694 \ 2695 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2696 "Force a safepoint every n compiles so sweeper can keep up") \ 2697 \ 2698 develop(bool, FillDelaySlots, true, \ 2699 "Fill delay slots (on SPARC only)") \ 2700 \ 2701 develop(bool, TimeLivenessAnalysis, false, \ 2702 "Time computation of bytecode liveness analysis") \ 2703 \ 2704 develop(bool, TraceLivenessGen, false, \ 2705 "Trace the generation of liveness analysis information") \ 2706 \ 2707 notproduct(bool, TraceLivenessQuery, false, \ 2708 "Trace queries of liveness analysis information") \ 2709 \ 2710 notproduct(bool, CollectIndexSetStatistics, false, \ 2711 "Collect information about IndexSets") \ 2712 \ 2713 develop(bool, UseLoopSafepoints, true, \ 2714 "Generate Safepoint nodes in every loop") \ 2715 \ 2716 develop(intx, FastAllocateSizeLimit, 128*K, \ 2717 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2718 "Inline allocations larger than this in doublewords must go slow")\ 2719 \ 2720 product(bool, AggressiveOpts, false, \ 2721 "Enable aggressive optimizations - see arguments.cpp") \ 2722 \ 2723 product_pd(bool, CompactStrings, \ 2724 "Enable Strings to use single byte chars in backing store") \ 2725 \ 2726 product_pd(uintx, TypeProfileLevel, \ 2727 "=XYZ, with Z: Type profiling of arguments at call; " \ 2728 "Y: Type profiling of return value at call; " \ 2729 "X: Type profiling of parameters to methods; " \ 2730 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2731 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2732 \ 2733 product(intx, TypeProfileArgsLimit, 2, \ 2734 "max number of call arguments to consider for type profiling") \ 2735 range(0, 16) \ 2736 \ 2737 product(intx, TypeProfileParmsLimit, 2, \ 2738 "max number of incoming parameters to consider for type profiling"\ 2739 ", -1 for all") \ 2740 range(-1, 64) \ 2741 \ 2742 /* statistics */ \ 2743 develop(bool, CountCompiledCalls, false, \ 2744 "Count method invocations") \ 2745 \ 2746 notproduct(bool, CountRuntimeCalls, false, \ 2747 "Count VM runtime calls") \ 2748 \ 2749 develop(bool, CountJNICalls, false, \ 2750 "Count jni method invocations") \ 2751 \ 2752 notproduct(bool, CountJVMCalls, false, \ 2753 "Count jvm method invocations") \ 2754 \ 2755 notproduct(bool, CountRemovableExceptions, false, \ 2756 "Count exceptions that could be replaced by branches due to " \ 2757 "inlining") \ 2758 \ 2759 notproduct(bool, ICMissHistogram, false, \ 2760 "Produce histogram of IC misses") \ 2761 \ 2762 /* interpreter */ \ 2763 product_pd(bool, RewriteBytecodes, \ 2764 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2765 \ 2766 product_pd(bool, RewriteFrequentPairs, \ 2767 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2768 \ 2769 diagnostic(bool, PrintInterpreter, false, \ 2770 "Print the generated interpreter code") \ 2771 \ 2772 product(bool, UseInterpreter, true, \ 2773 "Use interpreter for non-compiled methods") \ 2774 \ 2775 develop(bool, UseFastSignatureHandlers, true, \ 2776 "Use fast signature handlers for native calls") \ 2777 \ 2778 product(bool, UseLoopCounter, true, \ 2779 "Increment invocation counter on backward branch") \ 2780 \ 2781 product_pd(bool, UseOnStackReplacement, \ 2782 "Use on stack replacement, calls runtime if invoc. counter " \ 2783 "overflows in loop") \ 2784 \ 2785 notproduct(bool, TraceOnStackReplacement, false, \ 2786 "Trace on stack replacement") \ 2787 \ 2788 product_pd(bool, PreferInterpreterNativeStubs, \ 2789 "Use always interpreter stubs for native methods invoked via " \ 2790 "interpreter") \ 2791 \ 2792 develop(bool, CountBytecodes, false, \ 2793 "Count number of bytecodes executed") \ 2794 \ 2795 develop(bool, PrintBytecodeHistogram, false, \ 2796 "Print histogram of the executed bytecodes") \ 2797 \ 2798 develop(bool, PrintBytecodePairHistogram, false, \ 2799 "Print histogram of the executed bytecode pairs") \ 2800 \ 2801 diagnostic(bool, PrintSignatureHandlers, false, \ 2802 "Print code generated for native method signature handlers") \ 2803 \ 2804 develop(bool, VerifyOops, false, \ 2805 "Do plausibility checks for oops") \ 2806 \ 2807 develop(bool, CheckUnhandledOops, false, \ 2808 "Check for unhandled oops in VM code") \ 2809 \ 2810 develop(bool, VerifyJNIFields, trueInDebug, \ 2811 "Verify jfieldIDs for instance fields") \ 2812 \ 2813 notproduct(bool, VerifyJNIEnvThread, false, \ 2814 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2815 "from JNI") \ 2816 \ 2817 develop(bool, VerifyFPU, false, \ 2818 "Verify FPU state (check for NaN's, etc.)") \ 2819 \ 2820 develop(bool, VerifyThread, false, \ 2821 "Watch the thread register for corruption (SPARC only)") \ 2822 \ 2823 develop(bool, VerifyActivationFrameSize, false, \ 2824 "Verify that activation frame didn't become smaller than its " \ 2825 "minimal size") \ 2826 \ 2827 develop(bool, TraceFrequencyInlining, false, \ 2828 "Trace frequency based inlining") \ 2829 \ 2830 develop_pd(bool, InlineIntrinsics, \ 2831 "Inline intrinsics that can be statically resolved") \ 2832 \ 2833 product_pd(bool, ProfileInterpreter, \ 2834 "Profile at the bytecode level during interpretation") \ 2835 \ 2836 develop(bool, TraceProfileInterpreter, false, \ 2837 "Trace profiling at the bytecode level during interpretation. " \ 2838 "This outputs the profiling information collected to improve " \ 2839 "jit compilation.") \ 2840 \ 2841 develop_pd(bool, ProfileTraps, \ 2842 "Profile deoptimization traps at the bytecode level") \ 2843 \ 2844 product(intx, ProfileMaturityPercentage, 20, \ 2845 "number of method invocations/branches (expressed as % of " \ 2846 "CompileThreshold) before using the method's profile") \ 2847 range(0, 100) \ 2848 \ 2849 diagnostic(bool, PrintMethodData, false, \ 2850 "Print the results of +ProfileInterpreter at end of run") \ 2851 \ 2852 develop(bool, VerifyDataPointer, trueInDebug, \ 2853 "Verify the method data pointer during interpreter profiling") \ 2854 \ 2855 develop(bool, VerifyCompiledCode, false, \ 2856 "Include miscellaneous runtime verifications in nmethod code; " \ 2857 "default off because it disturbs nmethod size heuristics") \ 2858 \ 2859 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2860 "Manually make GC thread crash then dump java stack trace; " \ 2861 "Test only") \ 2862 \ 2863 /* compilation */ \ 2864 product(bool, UseCompiler, true, \ 2865 "Use Just-In-Time compilation") \ 2866 \ 2867 develop(bool, TraceCompilationPolicy, false, \ 2868 "Trace compilation policy") \ 2869 \ 2870 develop(bool, TimeCompilationPolicy, false, \ 2871 "Time the compilation policy") \ 2872 \ 2873 product(bool, UseCounterDecay, true, \ 2874 "Adjust recompilation counters") \ 2875 \ 2876 develop(intx, CounterHalfLifeTime, 30, \ 2877 "Half-life time of invocation counters (in seconds)") \ 2878 \ 2879 develop(intx, CounterDecayMinIntervalLength, 500, \ 2880 "The minimum interval (in milliseconds) between invocation of " \ 2881 "CounterDecay") \ 2882 \ 2883 product(bool, AlwaysCompileLoopMethods, false, \ 2884 "When using recompilation, never interpret methods " \ 2885 "containing loops") \ 2886 \ 2887 product(bool, DontCompileHugeMethods, true, \ 2888 "Do not compile methods > HugeMethodLimit") \ 2889 \ 2890 /* Bytecode escape analysis estimation. */ \ 2891 product(bool, EstimateArgEscape, true, \ 2892 "Analyze bytecodes to estimate escape state of arguments") \ 2893 \ 2894 product(intx, BCEATraceLevel, 0, \ 2895 "How much tracing to do of bytecode escape analysis estimates " \ 2896 "(0-3)") \ 2897 range(0, 3) \ 2898 \ 2899 product(intx, MaxBCEAEstimateLevel, 5, \ 2900 "Maximum number of nested calls that are analyzed by BC EA") \ 2901 range(0, max_jint) \ 2902 \ 2903 product(intx, MaxBCEAEstimateSize, 150, \ 2904 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2905 range(0, max_jint) \ 2906 \ 2907 product(intx, AllocatePrefetchStyle, 1, \ 2908 "0 = no prefetch, " \ 2909 "1 = prefetch instructions for each allocation, " \ 2910 "2 = use TLAB watermark to gate allocation prefetch, " \ 2911 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2912 range(0, 3) \ 2913 \ 2914 product(intx, AllocatePrefetchDistance, -1, \ 2915 "Distance to prefetch ahead of allocation pointer. " \ 2916 "-1: use system-specific value (automatically determined") \ 2917 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2918 \ 2919 product(intx, AllocatePrefetchLines, 3, \ 2920 "Number of lines to prefetch ahead of array allocation pointer") \ 2921 range(1, 64) \ 2922 \ 2923 product(intx, AllocateInstancePrefetchLines, 1, \ 2924 "Number of lines to prefetch ahead of instance allocation " \ 2925 "pointer") \ 2926 range(1, 64) \ 2927 \ 2928 product(intx, AllocatePrefetchStepSize, 16, \ 2929 "Step size in bytes of sequential prefetch instructions") \ 2930 range(1, 512) \ 2931 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2932 \ 2933 product(intx, AllocatePrefetchInstr, 0, \ 2934 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2935 constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo) \ 2936 \ 2937 /* deoptimization */ \ 2938 develop(bool, TraceDeoptimization, false, \ 2939 "Trace deoptimization") \ 2940 \ 2941 develop(bool, PrintDeoptimizationDetails, false, \ 2942 "Print more information about deoptimization") \ 2943 \ 2944 develop(bool, DebugDeoptimization, false, \ 2945 "Tracing various information while debugging deoptimization") \ 2946 \ 2947 product(intx, SelfDestructTimer, 0, \ 2948 "Will cause VM to terminate after a given time (in minutes) " \ 2949 "(0 means off)") \ 2950 range(0, max_intx) \ 2951 \ 2952 product(intx, MaxJavaStackTraceDepth, 1024, \ 2953 "The maximum number of lines in the stack trace for Java " \ 2954 "exceptions (0 means all)") \ 2955 range(0, max_jint/2) \ 2956 \ 2957 develop(bool, TraceStackWalk, false, \ 2958 "Trace stack walking") \ 2959 \ 2960 product(bool, MemberNameInStackFrame, true, \ 2961 "Use MemberName in StackFrame") \ 2962 \ 2963 /* notice: the max range value here is max_jint, not max_intx */ \ 2964 /* because of overflow issue */ \ 2965 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2966 "Guarantee a safepoint (at least) every so many milliseconds " \ 2967 "(0 means none)")) \ 2968 NOT_EMBEDDED(range(0, max_jint)) \ 2969 \ 2970 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2971 "Guarantee a safepoint (at least) every so many milliseconds " \ 2972 "(0 means none)")) \ 2973 EMBEDDED_ONLY(range(0, max_jint)) \ 2974 \ 2975 product(intx, SafepointTimeoutDelay, 10000, \ 2976 "Delay in milliseconds for option SafepointTimeout") \ 2977 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2978 NOT_LP64(range(0, max_intx)) \ 2979 \ 2980 product(intx, NmethodSweepActivity, 10, \ 2981 "Removes cold nmethods from code cache if > 0. Higher values " \ 2982 "result in more aggressive sweeping") \ 2983 range(0, 2000) \ 2984 \ 2985 notproduct(bool, LogSweeper, false, \ 2986 "Keep a ring buffer of sweeper activity") \ 2987 \ 2988 notproduct(intx, SweeperLogEntries, 1024, \ 2989 "Number of records in the ring buffer of sweeper activity") \ 2990 \ 2991 notproduct(intx, MemProfilingInterval, 500, \ 2992 "Time between each invocation of the MemProfiler") \ 2993 \ 2994 develop(intx, MallocCatchPtr, -1, \ 2995 "Hit breakpoint when mallocing/freeing this pointer") \ 2996 \ 2997 notproduct(ccstrlist, SuppressErrorAt, "", \ 2998 "List of assertions (file:line) to muzzle") \ 2999 \ 3000 develop(intx, StackPrintLimit, 100, \ 3001 "number of stack frames to print in VM-level stack dump") \ 3002 \ 3003 notproduct(intx, MaxElementPrintSize, 256, \ 3004 "maximum number of elements to print") \ 3005 \ 3006 notproduct(intx, MaxSubklassPrintSize, 4, \ 3007 "maximum number of subklasses to print when printing klass") \ 3008 \ 3009 product(intx, MaxInlineLevel, 9, \ 3010 "maximum number of nested calls that are inlined") \ 3011 range(0, max_jint) \ 3012 \ 3013 product(intx, MaxRecursiveInlineLevel, 1, \ 3014 "maximum number of nested recursive calls that are inlined") \ 3015 range(0, max_jint) \ 3016 \ 3017 develop(intx, MaxForceInlineLevel, 100, \ 3018 "maximum number of nested calls that are forced for inlining " \ 3019 "(using CompileCommand or marked w/ @ForceInline)") \ 3020 range(0, max_jint) \ 3021 \ 3022 product_pd(intx, InlineSmallCode, \ 3023 "Only inline already compiled methods if their code size is " \ 3024 "less than this") \ 3025 range(0, max_jint) \ 3026 \ 3027 product(intx, MaxInlineSize, 35, \ 3028 "The maximum bytecode size of a method to be inlined") \ 3029 range(0, max_jint) \ 3030 \ 3031 product_pd(intx, FreqInlineSize, \ 3032 "The maximum bytecode size of a frequent method to be inlined") \ 3033 range(0, max_jint) \ 3034 \ 3035 product(intx, MaxTrivialSize, 6, \ 3036 "The maximum bytecode size of a trivial method to be inlined") \ 3037 range(0, max_jint) \ 3038 \ 3039 product(intx, MinInliningThreshold, 250, \ 3040 "The minimum invocation count a method needs to have to be " \ 3041 "inlined") \ 3042 range(0, max_jint) \ 3043 \ 3044 develop(intx, MethodHistogramCutoff, 100, \ 3045 "The cutoff value for method invocation histogram (+CountCalls)") \ 3046 \ 3047 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3048 "Number of interpreted methods to show in profile") \ 3049 \ 3050 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 3051 "Number of compiled methods to show in profile") \ 3052 \ 3053 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 3054 "Number of stub methods to show in profile") \ 3055 \ 3056 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3057 "Number of runtime stub nodes to show in profile") \ 3058 \ 3059 product(intx, ProfileIntervalsTicks, 100, \ 3060 "Number of ticks between printing of interval profile " \ 3061 "(+ProfileIntervals)") \ 3062 range(0, max_intx) \ 3063 \ 3064 notproduct(intx, ScavengeALotInterval, 1, \ 3065 "Interval between which scavenge will occur with +ScavengeALot") \ 3066 \ 3067 notproduct(intx, FullGCALotInterval, 1, \ 3068 "Interval between which full gc will occur with +FullGCALot") \ 3069 \ 3070 notproduct(intx, FullGCALotStart, 0, \ 3071 "For which invocation to start FullGCAlot") \ 3072 \ 3073 notproduct(intx, FullGCALotDummies, 32*K, \ 3074 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3075 "to move") \ 3076 \ 3077 develop(intx, DontYieldALotInterval, 10, \ 3078 "Interval between which yields will be dropped (milliseconds)") \ 3079 \ 3080 develop(intx, MinSleepInterval, 1, \ 3081 "Minimum sleep() interval (milliseconds) when " \ 3082 "ConvertSleepToYield is off (used for Solaris)") \ 3083 \ 3084 develop(intx, ProfilerPCTickThreshold, 15, \ 3085 "Number of ticks in a PC buckets to be a hotspot") \ 3086 \ 3087 notproduct(intx, DeoptimizeALotInterval, 5, \ 3088 "Number of exits until DeoptimizeALot kicks in") \ 3089 \ 3090 notproduct(intx, ZombieALotInterval, 5, \ 3091 "Number of exits until ZombieALot kicks in") \ 3092 \ 3093 diagnostic(intx, MallocVerifyInterval, 0, \ 3094 "If non-zero, verify C heap after every N calls to " \ 3095 "malloc/realloc/free") \ 3096 range(0, max_intx) \ 3097 \ 3098 diagnostic(intx, MallocVerifyStart, 0, \ 3099 "If non-zero, start verifying C heap after Nth call to " \ 3100 "malloc/realloc/free") \ 3101 range(0, max_intx) \ 3102 \ 3103 diagnostic(uintx, MallocMaxTestWords, 0, \ 3104 "If non-zero, maximum number of words that malloc/realloc can " \ 3105 "allocate (for testing only)") \ 3106 range(0, max_uintx) \ 3107 \ 3108 product(intx, TypeProfileWidth, 2, \ 3109 "Number of receiver types to record in call/cast profile") \ 3110 range(0, 8) \ 3111 \ 3112 experimental(intx, MethodProfileWidth, 0, \ 3113 "Number of methods to record in call profile") \ 3114 \ 3115 develop(intx, BciProfileWidth, 2, \ 3116 "Number of return bci's to record in ret profile") \ 3117 \ 3118 product(intx, PerMethodRecompilationCutoff, 400, \ 3119 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3120 range(-1, max_intx) \ 3121 \ 3122 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3123 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3124 range(-1, max_intx) \ 3125 \ 3126 product(intx, PerMethodTrapLimit, 100, \ 3127 "Limit on traps (of one kind) in a method (includes inlines)") \ 3128 range(0, max_jint) \ 3129 \ 3130 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3131 "Limit on speculative traps (of one kind) in a method " \ 3132 "(includes inlines)") \ 3133 range(0, max_jint) \ 3134 \ 3135 product(intx, PerBytecodeTrapLimit, 4, \ 3136 "Limit on traps (of one kind) at a particular BCI") \ 3137 range(0, max_jint) \ 3138 \ 3139 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3140 "Extra method data trap entries for speculation") \ 3141 \ 3142 develop(intx, InlineFrequencyRatio, 20, \ 3143 "Ratio of call site execution to caller method invocation") \ 3144 range(0, max_jint) \ 3145 \ 3146 develop_pd(intx, InlineFrequencyCount, \ 3147 "Count of call site execution necessary to trigger frequent " \ 3148 "inlining") \ 3149 range(0, max_jint) \ 3150 \ 3151 develop(intx, InlineThrowCount, 50, \ 3152 "Force inlining of interpreted methods that throw this often") \ 3153 range(0, max_jint) \ 3154 \ 3155 develop(intx, InlineThrowMaxSize, 200, \ 3156 "Force inlining of throwing methods smaller than this") \ 3157 range(0, max_jint) \ 3158 \ 3159 develop(intx, ProfilerNodeSize, 1024, \ 3160 "Size in K to allocate for the Profile Nodes of each thread") \ 3161 range(0, 1024) \ 3162 \ 3163 /* gc parameters */ \ 3164 product(size_t, InitialHeapSize, 0, \ 3165 "Initial heap size (in bytes); zero means use ergonomics") \ 3166 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3167 \ 3168 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3169 "Maximum heap size (in bytes)") \ 3170 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3171 \ 3172 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3173 "Initial tenured generation size (in bytes)") \ 3174 range(0, max_uintx) \ 3175 \ 3176 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3177 "Initial new generation size (in bytes)") \ 3178 constraint(NewSizeConstraintFunc,AfterErgo) \ 3179 \ 3180 product(size_t, MaxNewSize, max_uintx, \ 3181 "Maximum new generation size (in bytes), max_uintx means set " \ 3182 "ergonomically") \ 3183 range(0, max_uintx) \ 3184 \ 3185 product_pd(size_t, HeapBaseMinAddress, \ 3186 "OS specific low limit for heap base address") \ 3187 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3188 \ 3189 product(size_t, PretenureSizeThreshold, 0, \ 3190 "Maximum size in bytes of objects allocated in DefNew " \ 3191 "generation; zero means no maximum") \ 3192 range(0, max_uintx) \ 3193 \ 3194 product(size_t, MinTLABSize, 2*K, \ 3195 "Minimum allowed TLAB size (in bytes)") \ 3196 range(1, max_uintx/2) \ 3197 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3198 \ 3199 product(size_t, TLABSize, 0, \ 3200 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3201 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3202 \ 3203 product(size_t, YoungPLABSize, 4096, \ 3204 "Size of young gen promotion LAB's (in HeapWords)") \ 3205 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3206 \ 3207 product(size_t, OldPLABSize, 1024, \ 3208 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3209 "of blocks to attempt to claim when refilling CMS LAB's") \ 3210 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3211 \ 3212 product(uintx, TLABAllocationWeight, 35, \ 3213 "Allocation averaging weight") \ 3214 range(0, 100) \ 3215 \ 3216 /* Limit the lower bound of this flag to 1 as it is used */ \ 3217 /* in a division expression. */ \ 3218 product(uintx, TLABWasteTargetPercent, 1, \ 3219 "Percentage of Eden that can be wasted") \ 3220 range(1, 100) \ 3221 \ 3222 product(uintx, TLABRefillWasteFraction, 64, \ 3223 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3224 range(1, max_juint) \ 3225 \ 3226 product(uintx, TLABWasteIncrement, 4, \ 3227 "Increment allowed waste at slow allocation") \ 3228 range(0, max_jint) \ 3229 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3230 \ 3231 product(uintx, SurvivorRatio, 8, \ 3232 "Ratio of eden/survivor space size") \ 3233 range(1, max_uintx-2) \ 3234 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3235 \ 3236 product(uintx, NewRatio, 2, \ 3237 "Ratio of old/new generation sizes") \ 3238 range(0, max_uintx-1) \ 3239 \ 3240 product_pd(size_t, NewSizeThreadIncrease, \ 3241 "Additional size added to desired new generation size per " \ 3242 "non-daemon thread (in bytes)") \ 3243 range(0, max_uintx) \ 3244 \ 3245 product_pd(size_t, MetaspaceSize, \ 3246 "Initial threshold (in bytes) at which a garbage collection " \ 3247 "is done to reduce Metaspace usage") \ 3248 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3249 \ 3250 product(size_t, MaxMetaspaceSize, max_uintx, \ 3251 "Maximum size of Metaspaces (in bytes)") \ 3252 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3253 \ 3254 product(size_t, CompressedClassSpaceSize, 1*G, \ 3255 "Maximum size of class area in Metaspace when compressed " \ 3256 "class pointers are used") \ 3257 range(1*M, 3*G) \ 3258 \ 3259 manageable(uintx, MinHeapFreeRatio, 40, \ 3260 "The minimum percentage of heap free after GC to avoid expansion."\ 3261 " For most GCs this applies to the old generation. In G1 and" \ 3262 " ParallelGC it applies to the whole heap.") \ 3263 range(0, 100) \ 3264 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3265 \ 3266 manageable(uintx, MaxHeapFreeRatio, 70, \ 3267 "The maximum percentage of heap free after GC to avoid shrinking."\ 3268 " For most GCs this applies to the old generation. In G1 and" \ 3269 " ParallelGC it applies to the whole heap.") \ 3270 range(0, 100) \ 3271 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3272 \ 3273 product(bool, ShrinkHeapInSteps, true, \ 3274 "When disabled, informs the GC to shrink the java heap directly" \ 3275 " to the target size at the next full GC rather than requiring" \ 3276 " smaller steps during multiple full GCs.") \ 3277 \ 3278 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3279 "Number of milliseconds per MB of free space in the heap") \ 3280 range(0, max_intx) \ 3281 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3282 \ 3283 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3284 "The minimum change in heap space due to GC (in bytes)") \ 3285 range(0, max_uintx) \ 3286 \ 3287 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3288 "The minimum expansion of Metaspace (in bytes)") \ 3289 range(0, max_uintx) \ 3290 \ 3291 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3292 "The maximum percentage of Metaspace free after GC to avoid " \ 3293 "shrinking") \ 3294 range(0, 100) \ 3295 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3296 \ 3297 product(uintx, MinMetaspaceFreeRatio, 40, \ 3298 "The minimum percentage of Metaspace free after GC to avoid " \ 3299 "expansion") \ 3300 range(0, 99) \ 3301 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3302 \ 3303 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3304 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3305 range(0, max_uintx) \ 3306 \ 3307 product(uintx, QueuedAllocationWarningCount, 0, \ 3308 "Number of times an allocation that queues behind a GC " \ 3309 "will retry before printing a warning") \ 3310 range(0, max_uintx) \ 3311 \ 3312 diagnostic(uintx, VerifyGCStartAt, 0, \ 3313 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3314 range(0, max_uintx) \ 3315 \ 3316 diagnostic(intx, VerifyGCLevel, 0, \ 3317 "Generation level at which to start +VerifyBefore/AfterGC") \ 3318 range(0, 1) \ 3319 \ 3320 product(uintx, MaxTenuringThreshold, 15, \ 3321 "Maximum value for tenuring threshold") \ 3322 range(0, markOopDesc::max_age + 1) \ 3323 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3324 \ 3325 product(uintx, InitialTenuringThreshold, 7, \ 3326 "Initial value for tenuring threshold") \ 3327 range(0, markOopDesc::max_age + 1) \ 3328 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3329 \ 3330 product(uintx, TargetSurvivorRatio, 50, \ 3331 "Desired percentage of survivor space used after scavenge") \ 3332 range(0, 100) \ 3333 \ 3334 product(uintx, MarkSweepDeadRatio, 5, \ 3335 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3336 "Serial mark sweep treats this as both the minimum and maximum " \ 3337 "value. " \ 3338 "CMS uses this value only if it falls back to mark sweep. " \ 3339 "Par compact uses a variable scale based on the density of the " \ 3340 "generation and treats this as the maximum value when the heap " \ 3341 "is either completely full or completely empty. Par compact " \ 3342 "also has a smaller default value; see arguments.cpp.") \ 3343 range(0, 100) \ 3344 \ 3345 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3346 "How often should we fully compact the heap (ignoring the dead " \ 3347 "space parameters)") \ 3348 range(1, max_juint) \ 3349 \ 3350 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3351 "Delay between expansion and allocation (in milliseconds)") \ 3352 \ 3353 develop(uintx, GCWorkerDelayMillis, 0, \ 3354 "Delay in scheduling GC workers (in milliseconds)") \ 3355 \ 3356 product(intx, DeferThrSuspendLoopCount, 4000, \ 3357 "(Unstable) Number of times to iterate in safepoint loop " \ 3358 "before blocking VM threads ") \ 3359 range(-1, max_jint-1) \ 3360 \ 3361 product(intx, DeferPollingPageLoopCount, -1, \ 3362 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3363 "before changing safepoint polling page to RO ") \ 3364 range(-1, max_jint-1) \ 3365 \ 3366 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3367 range(0, max_intx) \ 3368 \ 3369 product(bool, PSChunkLargeArrays, true, \ 3370 "Process large arrays in chunks") \ 3371 \ 3372 product(uintx, GCDrainStackTargetSize, 64, \ 3373 "Number of entries we will try to leave on the stack " \ 3374 "during parallel gc") \ 3375 range(0, max_juint) \ 3376 \ 3377 /* stack parameters */ \ 3378 product_pd(intx, StackYellowPages, \ 3379 "Number of yellow zone (recoverable overflows) pages of size " \ 3380 "4KB. If pages are bigger yellow zone is aligned up.") \ 3381 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3382 \ 3383 product_pd(intx, StackRedPages, \ 3384 "Number of red zone (unrecoverable overflows) pages of size " \ 3385 "4KB. If pages are bigger red zone is aligned up.") \ 3386 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3387 \ 3388 product_pd(intx, StackReservedPages, \ 3389 "Number of reserved zone (reserved to annotated methods) pages" \ 3390 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3391 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3392 \ 3393 product(bool, RestrictReservedStack, true, \ 3394 "Restrict @ReservedStackAccess to trusted classes") \ 3395 \ 3396 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3397 product_pd(intx, StackShadowPages, \ 3398 "Number of shadow zone (for overflow checking) pages of size " \ 3399 "4KB. If pages are bigger shadow zone is aligned up. " \ 3400 "This should exceed the depth of the VM and native call stack.") \ 3401 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3402 \ 3403 product_pd(intx, ThreadStackSize, \ 3404 "Thread Stack Size (in Kbytes)") \ 3405 range(0, (max_intx-os::vm_page_size())/(1 * K)) \ 3406 \ 3407 product_pd(intx, VMThreadStackSize, \ 3408 "Non-Java Thread Stack Size (in Kbytes)") \ 3409 range(0, max_intx/(1 * K)) \ 3410 \ 3411 product_pd(intx, CompilerThreadStackSize, \ 3412 "Compiler Thread Stack Size (in Kbytes)") \ 3413 range(0, max_intx/(1 * K)) \ 3414 \ 3415 develop_pd(size_t, JVMInvokeMethodSlack, \ 3416 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3417 \ 3418 /* code cache parameters */ \ 3419 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3420 develop(uintx, CodeCacheSegmentSize, \ 3421 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \ 3422 "Code cache segment size (in bytes) - smallest unit of " \ 3423 "allocation") \ 3424 range(1, 1024) \ 3425 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3426 \ 3427 develop_pd(intx, CodeEntryAlignment, \ 3428 "Code entry alignment for generated code (in bytes)") \ 3429 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3430 \ 3431 product_pd(intx, OptoLoopAlignment, \ 3432 "Align inner loops to zero relative to this modulus") \ 3433 range(1, 16) \ 3434 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3435 \ 3436 product_pd(uintx, InitialCodeCacheSize, \ 3437 "Initial code cache size (in bytes)") \ 3438 range(0, max_uintx) \ 3439 \ 3440 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3441 "Minimum code cache size (in bytes) required to start VM.") \ 3442 range(0, max_uintx) \ 3443 \ 3444 product(bool, SegmentedCodeCache, false, \ 3445 "Use a segmented code cache") \ 3446 \ 3447 product_pd(uintx, ReservedCodeCacheSize, \ 3448 "Reserved code cache size (in bytes) - maximum code cache size") \ 3449 range(0, max_uintx) \ 3450 \ 3451 product_pd(uintx, NonProfiledCodeHeapSize, \ 3452 "Size of code heap with non-profiled methods (in bytes)") \ 3453 range(0, max_uintx) \ 3454 \ 3455 product_pd(uintx, ProfiledCodeHeapSize, \ 3456 "Size of code heap with profiled methods (in bytes)") \ 3457 range(0, max_uintx) \ 3458 \ 3459 product_pd(uintx, NonNMethodCodeHeapSize, \ 3460 "Size of code heap with non-nmethods (in bytes)") \ 3461 range(0, max_uintx) \ 3462 \ 3463 product_pd(uintx, CodeCacheExpansionSize, \ 3464 "Code cache expansion size (in bytes)") \ 3465 range(0, max_uintx) \ 3466 \ 3467 develop_pd(uintx, CodeCacheMinBlockLength, \ 3468 "Minimum number of segments in a code cache block") \ 3469 range(1, 100) \ 3470 \ 3471 notproduct(bool, ExitOnFullCodeCache, false, \ 3472 "Exit the VM if we fill the code cache") \ 3473 \ 3474 product(bool, UseCodeCacheFlushing, true, \ 3475 "Remove cold/old nmethods from the code cache") \ 3476 \ 3477 product(uintx, StartAggressiveSweepingAt, 10, \ 3478 "Start aggressive sweeping if X[%] of the code cache is free." \ 3479 "Segmented code cache: X[%] of the non-profiled heap." \ 3480 "Non-segmented code cache: X[%] of the total code cache") \ 3481 range(0, 100) \ 3482 \ 3483 /* interpreter debugging */ \ 3484 develop(intx, BinarySwitchThreshold, 5, \ 3485 "Minimal number of lookupswitch entries for rewriting to binary " \ 3486 "switch") \ 3487 \ 3488 develop(intx, StopInterpreterAt, 0, \ 3489 "Stop interpreter execution at specified bytecode number") \ 3490 \ 3491 develop(intx, TraceBytecodesAt, 0, \ 3492 "Trace bytecodes starting with specified bytecode number") \ 3493 \ 3494 /* compiler interface */ \ 3495 develop(intx, CIStart, 0, \ 3496 "The id of the first compilation to permit") \ 3497 \ 3498 develop(intx, CIStop, max_jint, \ 3499 "The id of the last compilation to permit") \ 3500 \ 3501 develop(intx, CIStartOSR, 0, \ 3502 "The id of the first osr compilation to permit " \ 3503 "(CICountOSR must be on)") \ 3504 \ 3505 develop(intx, CIStopOSR, max_jint, \ 3506 "The id of the last osr compilation to permit " \ 3507 "(CICountOSR must be on)") \ 3508 \ 3509 develop(intx, CIBreakAtOSR, -1, \ 3510 "The id of osr compilation to break at") \ 3511 \ 3512 develop(intx, CIBreakAt, -1, \ 3513 "The id of compilation to break at") \ 3514 \ 3515 product(ccstrlist, CompileOnly, "", \ 3516 "List of methods (pkg/class.name) to restrict compilation to") \ 3517 \ 3518 product(ccstr, CompileCommandFile, NULL, \ 3519 "Read compiler commands from this file [.hotspot_compiler]") \ 3520 \ 3521 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3522 "Read compiler directives from this file") \ 3523 \ 3524 product(ccstrlist, CompileCommand, "", \ 3525 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3526 \ 3527 develop(bool, ReplayCompiles, false, \ 3528 "Enable replay of compilations from ReplayDataFile") \ 3529 \ 3530 product(ccstr, ReplayDataFile, NULL, \ 3531 "File containing compilation replay information" \ 3532 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3533 \ 3534 product(ccstr, InlineDataFile, NULL, \ 3535 "File containing inlining replay information" \ 3536 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3537 \ 3538 develop(intx, ReplaySuppressInitializers, 2, \ 3539 "Control handling of class initialization during replay: " \ 3540 "0 - don't do anything special; " \ 3541 "1 - treat all class initializers as empty; " \ 3542 "2 - treat class initializers for application classes as empty; " \ 3543 "3 - allow all class initializers to run during bootstrap but " \ 3544 " pretend they are empty after starting replay") \ 3545 range(0, 3) \ 3546 \ 3547 develop(bool, ReplayIgnoreInitErrors, false, \ 3548 "Ignore exceptions thrown during initialization for replay") \ 3549 \ 3550 product(bool, DumpReplayDataOnError, true, \ 3551 "Record replay data for crashing compiler threads") \ 3552 \ 3553 product(bool, CICompilerCountPerCPU, false, \ 3554 "1 compiler thread for log(N CPUs)") \ 3555 \ 3556 develop(intx, CIFireOOMAt, -1, \ 3557 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3558 "(non-negative value throws OOM after this many CI accesses " \ 3559 "in each compile)") \ 3560 notproduct(intx, CICrashAt, -1, \ 3561 "id of compilation to trigger assert in compiler thread for " \ 3562 "the purpose of testing, e.g. generation of replay data") \ 3563 notproduct(bool, CIObjectFactoryVerify, false, \ 3564 "enable potentially expensive verification in ciObjectFactory") \ 3565 \ 3566 /* Priorities */ \ 3567 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3568 \ 3569 product(intx, ThreadPriorityPolicy, 0, \ 3570 "0 : Normal. "\ 3571 " VM chooses priorities that are appropriate for normal "\ 3572 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3573 " to normal native priority. Java priorities below " \ 3574 " NORM_PRIORITY map to lower native priority values. On "\ 3575 " Windows applications are allowed to use higher native "\ 3576 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3577 " not use the highest possible native priority, "\ 3578 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3579 " system threads. On Linux thread priorities are ignored "\ 3580 " because the OS does not support static priority in "\ 3581 " SCHED_OTHER scheduling class which is the only choice for "\ 3582 " non-root, non-realtime applications. "\ 3583 "1 : Aggressive. "\ 3584 " Java thread priorities map over to the entire range of "\ 3585 " native thread priorities. Higher Java thread priorities map "\ 3586 " to higher native thread priorities. This policy should be "\ 3587 " used with care, as sometimes it can cause performance "\ 3588 " degradation in the application and/or the entire system. On "\ 3589 " Linux this policy requires root privilege.") \ 3590 range(0, 1) \ 3591 \ 3592 product(bool, ThreadPriorityVerbose, false, \ 3593 "Print priority changes") \ 3594 \ 3595 product(intx, CompilerThreadPriority, -1, \ 3596 "The native priority at which compiler threads should run " \ 3597 "(-1 means no change)") \ 3598 range(min_jint, max_jint) \ 3599 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3600 \ 3601 product(intx, VMThreadPriority, -1, \ 3602 "The native priority at which the VM thread should run " \ 3603 "(-1 means no change)") \ 3604 range(-1, 127) \ 3605 \ 3606 product(bool, CompilerThreadHintNoPreempt, true, \ 3607 "(Solaris only) Give compiler threads an extra quanta") \ 3608 \ 3609 product(bool, VMThreadHintNoPreempt, false, \ 3610 "(Solaris only) Give VM thread an extra quanta") \ 3611 \ 3612 product(intx, JavaPriority1_To_OSPriority, -1, \ 3613 "Map Java priorities to OS priorities") \ 3614 range(-1, 127) \ 3615 \ 3616 product(intx, JavaPriority2_To_OSPriority, -1, \ 3617 "Map Java priorities to OS priorities") \ 3618 range(-1, 127) \ 3619 \ 3620 product(intx, JavaPriority3_To_OSPriority, -1, \ 3621 "Map Java priorities to OS priorities") \ 3622 range(-1, 127) \ 3623 \ 3624 product(intx, JavaPriority4_To_OSPriority, -1, \ 3625 "Map Java priorities to OS priorities") \ 3626 range(-1, 127) \ 3627 \ 3628 product(intx, JavaPriority5_To_OSPriority, -1, \ 3629 "Map Java priorities to OS priorities") \ 3630 range(-1, 127) \ 3631 \ 3632 product(intx, JavaPriority6_To_OSPriority, -1, \ 3633 "Map Java priorities to OS priorities") \ 3634 range(-1, 127) \ 3635 \ 3636 product(intx, JavaPriority7_To_OSPriority, -1, \ 3637 "Map Java priorities to OS priorities") \ 3638 range(-1, 127) \ 3639 \ 3640 product(intx, JavaPriority8_To_OSPriority, -1, \ 3641 "Map Java priorities to OS priorities") \ 3642 range(-1, 127) \ 3643 \ 3644 product(intx, JavaPriority9_To_OSPriority, -1, \ 3645 "Map Java priorities to OS priorities") \ 3646 range(-1, 127) \ 3647 \ 3648 product(intx, JavaPriority10_To_OSPriority,-1, \ 3649 "Map Java priorities to OS priorities") \ 3650 range(-1, 127) \ 3651 \ 3652 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3653 "Java thread priority 10 maps to critical scheduling priority") \ 3654 \ 3655 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3656 "Compiler thread(s) run at critical scheduling priority") \ 3657 \ 3658 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3659 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3660 \ 3661 /* compiler debugging */ \ 3662 notproduct(intx, CompileTheWorldStartAt, 1, \ 3663 "First class to consider when using +CompileTheWorld") \ 3664 \ 3665 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3666 "Last class to consider when using +CompileTheWorld") \ 3667 \ 3668 develop(intx, NewCodeParameter, 0, \ 3669 "Testing Only: Create a dedicated integer parameter before " \ 3670 "putback") \ 3671 \ 3672 /* new oopmap storage allocation */ \ 3673 develop(intx, MinOopMapAllocation, 8, \ 3674 "Minimum number of OopMap entries in an OopMapSet") \ 3675 \ 3676 /* Background Compilation */ \ 3677 develop(intx, LongCompileThreshold, 50, \ 3678 "Used with +TraceLongCompiles") \ 3679 \ 3680 /* recompilation */ \ 3681 product_pd(intx, CompileThreshold, \ 3682 "number of interpreted method invocations before (re-)compiling") \ 3683 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3684 \ 3685 product(double, CompileThresholdScaling, 1.0, \ 3686 "Factor to control when first compilation happens " \ 3687 "(both with and without tiered compilation): " \ 3688 "values greater than 1.0 delay counter overflow, " \ 3689 "values between 0 and 1.0 rush counter overflow, " \ 3690 "value of 1.0 leaves compilation thresholds unchanged " \ 3691 "value of 0.0 is equivalent to -Xint. " \ 3692 "" \ 3693 "Flag can be set as per-method option. " \ 3694 "If a value is specified for a method, compilation thresholds " \ 3695 "for that method are scaled by both the value of the global flag "\ 3696 "and the value of the per-method flag.") \ 3697 range(0.0, DBL_MAX) \ 3698 \ 3699 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3700 "Interpreter (tier 0) invocation notification frequency") \ 3701 range(0, 30) \ 3702 \ 3703 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3704 "C1 without MDO (tier 2) invocation notification frequency") \ 3705 range(0, 30) \ 3706 \ 3707 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3708 "C1 with MDO profiling (tier 3) invocation notification " \ 3709 "frequency") \ 3710 range(0, 30) \ 3711 \ 3712 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3713 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3714 range(0, 30) \ 3715 \ 3716 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3717 "Interpreter (tier 0) invocation notification frequency") \ 3718 range(0, 30) \ 3719 \ 3720 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3721 "C1 without MDO (tier 2) invocation notification frequency") \ 3722 range(0, 30) \ 3723 \ 3724 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3725 "C1 with MDO profiling (tier 3) invocation notification " \ 3726 "frequency") \ 3727 range(0, 30) \ 3728 \ 3729 product(intx, Tier2CompileThreshold, 0, \ 3730 "threshold at which tier 2 compilation is invoked") \ 3731 range(0, max_jint) \ 3732 \ 3733 product(intx, Tier2BackEdgeThreshold, 0, \ 3734 "Back edge threshold at which tier 2 compilation is invoked") \ 3735 range(0, max_jint) \ 3736 \ 3737 product(intx, Tier3InvocationThreshold, 200, \ 3738 "Compile if number of method invocations crosses this " \ 3739 "threshold") \ 3740 range(0, max_jint) \ 3741 \ 3742 product(intx, Tier3MinInvocationThreshold, 100, \ 3743 "Minimum invocation to compile at tier 3") \ 3744 range(0, max_jint) \ 3745 \ 3746 product(intx, Tier3CompileThreshold, 2000, \ 3747 "Threshold at which tier 3 compilation is invoked (invocation " \ 3748 "minimum must be satisfied)") \ 3749 range(0, max_jint) \ 3750 \ 3751 product(intx, Tier3BackEdgeThreshold, 60000, \ 3752 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3753 range(0, max_jint) \ 3754 \ 3755 product(intx, Tier4InvocationThreshold, 5000, \ 3756 "Compile if number of method invocations crosses this " \ 3757 "threshold") \ 3758 range(0, max_jint) \ 3759 \ 3760 product(intx, Tier4MinInvocationThreshold, 600, \ 3761 "Minimum invocation to compile at tier 4") \ 3762 range(0, max_jint) \ 3763 \ 3764 product(intx, Tier4CompileThreshold, 15000, \ 3765 "Threshold at which tier 4 compilation is invoked (invocation " \ 3766 "minimum must be satisfied") \ 3767 range(0, max_jint) \ 3768 \ 3769 product(intx, Tier4BackEdgeThreshold, 40000, \ 3770 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3771 range(0, max_jint) \ 3772 \ 3773 product(intx, Tier3DelayOn, 5, \ 3774 "If C2 queue size grows over this amount per compiler thread " \ 3775 "stop compiling at tier 3 and start compiling at tier 2") \ 3776 range(0, max_jint) \ 3777 \ 3778 product(intx, Tier3DelayOff, 2, \ 3779 "If C2 queue size is less than this amount per compiler thread " \ 3780 "allow methods compiled at tier 2 transition to tier 3") \ 3781 range(0, max_jint) \ 3782 \ 3783 product(intx, Tier3LoadFeedback, 5, \ 3784 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3785 "reaches this amount per compiler thread") \ 3786 range(0, max_jint) \ 3787 \ 3788 product(intx, Tier4LoadFeedback, 3, \ 3789 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3790 "reaches this amount per compiler thread") \ 3791 range(0, max_jint) \ 3792 \ 3793 product(intx, TieredCompileTaskTimeout, 50, \ 3794 "Kill compile task if method was not used within " \ 3795 "given timeout in milliseconds") \ 3796 range(0, max_intx) \ 3797 \ 3798 product(intx, TieredStopAtLevel, 4, \ 3799 "Stop at given compilation level") \ 3800 range(0, 4) \ 3801 \ 3802 product(intx, Tier0ProfilingStartPercentage, 200, \ 3803 "Start profiling in interpreter if the counters exceed tier 3 " \ 3804 "thresholds by the specified percentage") \ 3805 range(0, max_jint) \ 3806 \ 3807 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3808 "Increase the compile threshold for C1 compilation if the code " \ 3809 "cache is filled by the specified percentage") \ 3810 range(0, 99) \ 3811 \ 3812 product(intx, TieredRateUpdateMinTime, 1, \ 3813 "Minimum rate sampling interval (in milliseconds)") \ 3814 range(0, max_intx) \ 3815 \ 3816 product(intx, TieredRateUpdateMaxTime, 25, \ 3817 "Maximum rate sampling interval (in milliseconds)") \ 3818 range(0, max_intx) \ 3819 \ 3820 product_pd(bool, TieredCompilation, \ 3821 "Enable tiered compilation") \ 3822 \ 3823 product(bool, PrintTieredEvents, false, \ 3824 "Print tiered events notifications") \ 3825 \ 3826 product_pd(intx, OnStackReplacePercentage, \ 3827 "NON_TIERED number of method invocations/branches (expressed as " \ 3828 "% of CompileThreshold) before (re-)compiling OSR code") \ 3829 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3830 \ 3831 product(intx, InterpreterProfilePercentage, 33, \ 3832 "NON_TIERED number of method invocations/branches (expressed as " \ 3833 "% of CompileThreshold) before profiling in the interpreter") \ 3834 range(0, 100) \ 3835 \ 3836 develop(intx, MaxRecompilationSearchLength, 10, \ 3837 "The maximum number of frames to inspect when searching for " \ 3838 "recompilee") \ 3839 \ 3840 develop(intx, MaxInterpretedSearchLength, 3, \ 3841 "The maximum number of interpreted frames to skip when searching "\ 3842 "for recompilee") \ 3843 \ 3844 develop(intx, DesiredMethodLimit, 8000, \ 3845 "The desired maximum method size (in bytecodes) after inlining") \ 3846 \ 3847 develop(intx, HugeMethodLimit, 8000, \ 3848 "Don't compile methods larger than this if " \ 3849 "+DontCompileHugeMethods") \ 3850 \ 3851 /* New JDK 1.4 reflection implementation */ \ 3852 \ 3853 develop(intx, FastSuperclassLimit, 8, \ 3854 "Depth of hardwired instanceof accelerator array") \ 3855 \ 3856 /* Properties for Java libraries */ \ 3857 \ 3858 product(size_t, MaxDirectMemorySize, 0, \ 3859 "Maximum total size of NIO direct-buffer allocations") \ 3860 range(0, (size_t)SIZE_MAX) \ 3861 \ 3862 /* Flags used for temporary code during development */ \ 3863 \ 3864 diagnostic(bool, UseNewCode, false, \ 3865 "Testing Only: Use the new version while testing") \ 3866 \ 3867 diagnostic(bool, UseNewCode2, false, \ 3868 "Testing Only: Use the new version while testing") \ 3869 \ 3870 diagnostic(bool, UseNewCode3, false, \ 3871 "Testing Only: Use the new version while testing") \ 3872 \ 3873 /* flags for performance data collection */ \ 3874 \ 3875 product(bool, UsePerfData, falseInEmbedded, \ 3876 "Flag to disable jvmstat instrumentation for performance testing "\ 3877 "and problem isolation purposes") \ 3878 \ 3879 product(bool, PerfDataSaveToFile, false, \ 3880 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3881 \ 3882 product(ccstr, PerfDataSaveFile, NULL, \ 3883 "Save PerfData memory to the specified absolute pathname. " \ 3884 "The string %p in the file name (if present) " \ 3885 "will be replaced by pid") \ 3886 \ 3887 product(intx, PerfDataSamplingInterval, 50, \ 3888 "Data sampling interval (in milliseconds)") \ 3889 range(PeriodicTask::min_interval, max_jint) \ 3890 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3891 \ 3892 develop(bool, PerfTraceDataCreation, false, \ 3893 "Trace creation of Performance Data Entries") \ 3894 \ 3895 develop(bool, PerfTraceMemOps, false, \ 3896 "Trace PerfMemory create/attach/detach calls") \ 3897 \ 3898 product(bool, PerfDisableSharedMem, false, \ 3899 "Store performance data in standard memory") \ 3900 \ 3901 product(intx, PerfDataMemorySize, 32*K, \ 3902 "Size of performance data memory region. Will be rounded " \ 3903 "up to a multiple of the native os page size.") \ 3904 range(128, 32*64*K) \ 3905 \ 3906 product(intx, PerfMaxStringConstLength, 1024, \ 3907 "Maximum PerfStringConstant string length before truncation") \ 3908 range(32, 32*K) \ 3909 \ 3910 product(bool, PerfAllowAtExitRegistration, false, \ 3911 "Allow registration of atexit() methods") \ 3912 \ 3913 product(bool, PerfBypassFileSystemCheck, false, \ 3914 "Bypass Win32 file system criteria checks (Windows Only)") \ 3915 \ 3916 product(intx, UnguardOnExecutionViolation, 0, \ 3917 "Unguard page and retry on no-execute fault (Win32 only) " \ 3918 "0=off, 1=conservative, 2=aggressive") \ 3919 range(0, 2) \ 3920 \ 3921 /* Serviceability Support */ \ 3922 \ 3923 product(bool, ManagementServer, false, \ 3924 "Create JMX Management Server") \ 3925 \ 3926 product(bool, DisableAttachMechanism, false, \ 3927 "Disable mechanism that allows tools to attach to this VM") \ 3928 \ 3929 product(bool, StartAttachListener, false, \ 3930 "Always start Attach Listener at VM startup") \ 3931 \ 3932 manageable(bool, PrintConcurrentLocks, false, \ 3933 "Print java.util.concurrent locks in thread dump") \ 3934 \ 3935 product(bool, TransmitErrorReport, false, \ 3936 "Enable error report transmission on erroneous termination") \ 3937 \ 3938 product(ccstr, ErrorReportServer, NULL, \ 3939 "Override built-in error report server address") \ 3940 \ 3941 /* Shared spaces */ \ 3942 \ 3943 product(bool, UseSharedSpaces, true, \ 3944 "Use shared spaces for metadata") \ 3945 \ 3946 product(bool, VerifySharedSpaces, false, \ 3947 "Verify shared spaces (false for default archive, true for " \ 3948 "archive specified by -XX:SharedArchiveFile)") \ 3949 \ 3950 product(bool, RequireSharedSpaces, false, \ 3951 "Require shared spaces for metadata") \ 3952 \ 3953 product(bool, DumpSharedSpaces, false, \ 3954 "Special mode: JVM reads a class list, loads classes, builds " \ 3955 "shared spaces, and dumps the shared spaces to a file to be " \ 3956 "used in future JVM runs") \ 3957 \ 3958 product(bool, PrintSharedSpaces, false, \ 3959 "Print usage of shared spaces") \ 3960 \ 3961 product(bool, PrintSharedArchiveAndExit, false, \ 3962 "Print shared archive file contents") \ 3963 \ 3964 product(bool, PrintSharedDictionary, false, \ 3965 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3966 "dictionary") \ 3967 \ 3968 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \ 3969 "Size of read-write space for metadata (in bytes)") \ 3970 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \ 3971 \ 3972 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \ 3973 "Size of read-only space for metadata (in bytes)") \ 3974 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \ 3975 \ 3976 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \ 3977 "Size of the shared miscellaneous data area (in bytes)") \ 3978 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \ 3979 \ 3980 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \ 3981 "Size of the shared miscellaneous code area (in bytes)") \ 3982 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \ 3983 \ 3984 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3985 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3986 "Address to allocate shared memory region for class data") \ 3987 range(0, SIZE_MAX) \ 3988 \ 3989 product(uintx, SharedSymbolTableBucketSize, 4, \ 3990 "Average number of symbols per bucket in shared table") \ 3991 range(2, 246) \ 3992 \ 3993 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3994 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3995 "classes. Just exclude them from the shared dictionary.") \ 3996 \ 3997 diagnostic(bool, PrintMethodHandleStubs, false, \ 3998 "Print generated stub code for method handles") \ 3999 \ 4000 develop(bool, TraceMethodHandles, false, \ 4001 "trace internal method handle operations") \ 4002 \ 4003 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 4004 "perform extra checks when constructing method handles") \ 4005 \ 4006 diagnostic(bool, ShowHiddenFrames, false, \ 4007 "show method handle implementation frames (usually hidden)") \ 4008 \ 4009 experimental(bool, TrustFinalNonStaticFields, false, \ 4010 "trust final non-static declarations for constant folding") \ 4011 \ 4012 diagnostic(bool, FoldStableValues, true, \ 4013 "Optimize loads from stable fields (marked w/ @Stable)") \ 4014 \ 4015 develop(bool, TraceInvokeDynamic, false, \ 4016 "trace internal invoke dynamic operations") \ 4017 \ 4018 diagnostic(bool, PauseAtStartup, false, \ 4019 "Causes the VM to pause at startup time and wait for the pause " \ 4020 "file to be removed (default: ./vm.paused.<pid>)") \ 4021 \ 4022 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4023 "The file to create and for whose removal to await when pausing " \ 4024 "at startup. (default: ./vm.paused.<pid>)") \ 4025 \ 4026 diagnostic(bool, PauseAtExit, false, \ 4027 "Pause and wait for keypress on exit if a debugger is attached") \ 4028 \ 4029 product(bool, ExtendedDTraceProbes, false, \ 4030 "Enable performance-impacting dtrace probes") \ 4031 \ 4032 product(bool, DTraceMethodProbes, false, \ 4033 "Enable dtrace probes for method-entry and method-exit") \ 4034 \ 4035 product(bool, DTraceAllocProbes, false, \ 4036 "Enable dtrace probes for object allocation") \ 4037 \ 4038 product(bool, DTraceMonitorProbes, false, \ 4039 "Enable dtrace probes for monitor events") \ 4040 \ 4041 product(bool, RelaxAccessControlCheck, false, \ 4042 "Relax the access control checks in the verifier") \ 4043 \ 4044 product(uintx, StringTableSize, defaultStringTableSize, \ 4045 "Number of buckets in the interned String table") \ 4046 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4047 \ 4048 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4049 "Number of buckets in the JVM internal Symbol table") \ 4050 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4051 \ 4052 product(bool, UseStringDeduplication, false, \ 4053 "Use string deduplication") \ 4054 \ 4055 product(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 develop_pd(intx, InitArrayShortSize, \ 4124 "Threshold small size (in bytes) for clearing arrays. " \ 4125 "Anything this size or smaller may get converted to discrete " \ 4126 "scalar stores.") \ 4127 range(0, max_intx) \ 4128 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4129 \ 4130 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4131 "Disable backwards compatibility for compile commands.") \ 4132 \ 4133 diagnostic(bool, CompilerDirectivesPrint, false, \ 4134 "Print compiler directives on installation.") \ 4135 diagnostic(int, CompilerDirectivesLimit, 50, \ 4136 "Limit on number of compiler directives.") 4137 4138 4139 /* 4140 * Macros for factoring of globals 4141 */ 4142 4143 // Interface macros 4144 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4145 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4146 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4147 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4148 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4149 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4150 #ifdef PRODUCT 4151 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4152 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4153 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4154 #else 4155 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4156 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4157 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4158 #endif // PRODUCT 4159 // Special LP64 flags, product only needed for now. 4160 #ifdef _LP64 4161 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4162 #else 4163 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4164 #endif // _LP64 4165 4166 // Implementation macros 4167 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4168 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4169 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4170 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4171 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4172 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4173 #ifdef PRODUCT 4174 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4175 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4176 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4177 #else 4178 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4179 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4180 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4181 #endif // PRODUCT 4182 #ifdef _LP64 4183 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4184 #else 4185 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4186 #endif // _LP64 4187 4188 // Only materialize src code for range checking when required, ignore otherwise 4189 #define IGNORE_RANGE(a, b) 4190 // Only materialize src code for contraint checking when required, ignore otherwise 4191 #define IGNORE_CONSTRAINT(func,type) 4192 4193 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4194 DECLARE_PD_DEVELOPER_FLAG, \ 4195 DECLARE_PRODUCT_FLAG, \ 4196 DECLARE_PD_PRODUCT_FLAG, \ 4197 DECLARE_DIAGNOSTIC_FLAG, \ 4198 DECLARE_EXPERIMENTAL_FLAG, \ 4199 DECLARE_NOTPRODUCT_FLAG, \ 4200 DECLARE_MANAGEABLE_FLAG, \ 4201 DECLARE_PRODUCT_RW_FLAG, \ 4202 DECLARE_LP64_PRODUCT_FLAG, \ 4203 IGNORE_RANGE, \ 4204 IGNORE_CONSTRAINT) 4205 4206 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4207 DECLARE_PD_DEVELOPER_FLAG, \ 4208 DECLARE_PRODUCT_FLAG, \ 4209 DECLARE_PD_PRODUCT_FLAG, \ 4210 DECLARE_DIAGNOSTIC_FLAG, \ 4211 DECLARE_NOTPRODUCT_FLAG, \ 4212 IGNORE_RANGE, \ 4213 IGNORE_CONSTRAINT) 4214 4215 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4216 DECLARE_PRODUCT_FLAG, \ 4217 DECLARE_DIAGNOSTIC_FLAG, \ 4218 DECLARE_EXPERIMENTAL_FLAG, \ 4219 DECLARE_NOTPRODUCT_FLAG, \ 4220 IGNORE_RANGE, \ 4221 IGNORE_CONSTRAINT) 4222 4223 // Extensions 4224 4225 #include "runtime/globals_ext.hpp" 4226 4227 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP