1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/debug.hpp" 29 30 // use this for flags that are true per default in the tiered build 31 // but false in non-tiered builds, and vice versa 32 #ifdef TIERED 33 #define trueInTiered true 34 #define falseInTiered false 35 #else 36 #define trueInTiered false 37 #define falseInTiered true 38 #endif 39 40 #ifdef TARGET_ARCH_x86 41 # include "globals_x86.hpp" 42 #endif 43 #ifdef TARGET_ARCH_sparc 44 # include "globals_sparc.hpp" 45 #endif 46 #ifdef TARGET_ARCH_zero 47 # include "globals_zero.hpp" 48 #endif 49 #ifdef TARGET_ARCH_arm 50 # include "globals_arm.hpp" 51 #endif 52 #ifdef TARGET_ARCH_ppc 53 # include "globals_ppc.hpp" 54 #endif 55 #ifdef TARGET_ARCH_aarch64 56 # include "globals_aarch64.hpp" 57 #endif 58 #ifdef TARGET_OS_FAMILY_linux 59 # include "globals_linux.hpp" 60 #endif 61 #ifdef TARGET_OS_FAMILY_solaris 62 # include "globals_solaris.hpp" 63 #endif 64 #ifdef TARGET_OS_FAMILY_windows 65 # include "globals_windows.hpp" 66 #endif 67 #ifdef TARGET_OS_FAMILY_aix 68 # include "globals_aix.hpp" 69 #endif 70 #ifdef TARGET_OS_FAMILY_bsd 71 # include "globals_bsd.hpp" 72 #endif 73 #ifdef TARGET_OS_ARCH_linux_x86 74 # include "globals_linux_x86.hpp" 75 #endif 76 #ifdef TARGET_OS_ARCH_linux_sparc 77 # include "globals_linux_sparc.hpp" 78 #endif 79 #ifdef TARGET_OS_ARCH_linux_zero 80 # include "globals_linux_zero.hpp" 81 #endif 82 #ifdef TARGET_OS_ARCH_solaris_x86 83 # include "globals_solaris_x86.hpp" 84 #endif 85 #ifdef TARGET_OS_ARCH_solaris_sparc 86 # include "globals_solaris_sparc.hpp" 87 #endif 88 #ifdef TARGET_OS_ARCH_windows_x86 89 # include "globals_windows_x86.hpp" 90 #endif 91 #ifdef TARGET_OS_ARCH_linux_arm 92 # include "globals_linux_arm.hpp" 93 #endif 94 #ifdef TARGET_OS_ARCH_linux_ppc 95 # include "globals_linux_ppc.hpp" 96 #endif 97 #ifdef TARGET_OS_ARCH_linux_aarch64 98 # include "globals_linux_aarch64.hpp" 99 #endif 100 #ifdef TARGET_OS_ARCH_aix_ppc 101 # include "globals_aix_ppc.hpp" 102 #endif 103 #ifdef TARGET_OS_ARCH_bsd_x86 104 # include "globals_bsd_x86.hpp" 105 #endif 106 #ifdef TARGET_OS_ARCH_bsd_zero 107 # include "globals_bsd_zero.hpp" 108 #endif 109 #ifdef COMPILER1 110 #ifdef TARGET_ARCH_x86 111 # include "c1_globals_x86.hpp" 112 #endif 113 #ifdef TARGET_ARCH_sparc 114 # include "c1_globals_sparc.hpp" 115 #endif 116 #ifdef TARGET_ARCH_arm 117 # include "c1_globals_arm.hpp" 118 #endif 119 #ifdef TARGET_ARCH_aarch64 120 # include "c1_globals_aarch64.hpp" 121 #endif 122 #ifdef TARGET_OS_FAMILY_linux 123 # include "c1_globals_linux.hpp" 124 #endif 125 #ifdef TARGET_OS_FAMILY_solaris 126 # include "c1_globals_solaris.hpp" 127 #endif 128 #ifdef TARGET_OS_FAMILY_windows 129 # include "c1_globals_windows.hpp" 130 #endif 131 #ifdef TARGET_OS_FAMILY_aix 132 # include "c1_globals_aix.hpp" 133 #endif 134 #ifdef TARGET_OS_FAMILY_bsd 135 # include "c1_globals_bsd.hpp" 136 #endif 137 #ifdef TARGET_ARCH_ppc 138 # include "c1_globals_ppc.hpp" 139 #endif 140 #endif 141 #ifdef COMPILER2 142 #ifdef TARGET_ARCH_x86 143 # include "c2_globals_x86.hpp" 144 #endif 145 #ifdef TARGET_ARCH_sparc 146 # include "c2_globals_sparc.hpp" 147 #endif 148 #ifdef TARGET_ARCH_arm 149 # include "c2_globals_arm.hpp" 150 #endif 151 #ifdef TARGET_ARCH_ppc 152 # include "c2_globals_ppc.hpp" 153 #endif 154 #ifdef TARGET_ARCH_aarch64 155 # include "c2_globals_aarch64.hpp" 156 #endif 157 #ifdef TARGET_OS_FAMILY_linux 158 # include "c2_globals_linux.hpp" 159 #endif 160 #ifdef TARGET_OS_FAMILY_solaris 161 # include "c2_globals_solaris.hpp" 162 #endif 163 #ifdef TARGET_OS_FAMILY_windows 164 # include "c2_globals_windows.hpp" 165 #endif 166 #ifdef TARGET_OS_FAMILY_aix 167 # include "c2_globals_aix.hpp" 168 #endif 169 #ifdef TARGET_OS_FAMILY_bsd 170 # include "c2_globals_bsd.hpp" 171 #endif 172 #endif 173 #ifdef SHARK 174 #ifdef TARGET_ARCH_zero 175 # include "shark_globals_zero.hpp" 176 #endif 177 #endif 178 179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 180 define_pd_global(bool, BackgroundCompilation, false); 181 define_pd_global(bool, UseTLAB, false); 182 define_pd_global(bool, CICompileOSR, false); 183 define_pd_global(bool, UseTypeProfile, false); 184 define_pd_global(bool, UseOnStackReplacement, false); 185 define_pd_global(bool, InlineIntrinsics, false); 186 define_pd_global(bool, PreferInterpreterNativeStubs, true); 187 define_pd_global(bool, ProfileInterpreter, false); 188 define_pd_global(bool, ProfileTraps, false); 189 define_pd_global(bool, TieredCompilation, false); 190 191 define_pd_global(intx, CompileThreshold, 0); 192 193 define_pd_global(intx, OnStackReplacePercentage, 0); 194 define_pd_global(bool, ResizeTLAB, false); 195 define_pd_global(intx, FreqInlineSize, 0); 196 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 197 define_pd_global(intx, InlineClassNatives, true); 198 define_pd_global(intx, InlineUnsafeOps, true); 199 define_pd_global(intx, InitialCodeCacheSize, 160*K); 200 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 201 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 202 define_pd_global(intx, ProfiledCodeHeapSize, 0); 203 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 204 205 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 206 define_pd_global(intx, CodeCacheMinBlockLength, 1); 207 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 208 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 209 define_pd_global(bool, NeverActAsServerClassMachine, true); 210 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 211 #define CI_COMPILER_COUNT 0 212 #else 213 214 #ifdef COMPILER2 215 #define CI_COMPILER_COUNT 2 216 #else 217 #define CI_COMPILER_COUNT 1 218 #endif // COMPILER2 219 220 #endif // no compilers 221 222 // string type aliases used only in this file 223 typedef const char* ccstr; 224 typedef const char* ccstrlist; // represents string arguments which accumulate 225 226 struct Flag { 227 enum Flags { 228 // value origin 229 DEFAULT = 0, 230 COMMAND_LINE = 1, 231 ENVIRON_VAR = 2, 232 CONFIG_FILE = 3, 233 MANAGEMENT = 4, 234 ERGONOMIC = 5, 235 ATTACH_ON_DEMAND = 6, 236 INTERNAL = 7, 237 238 LAST_VALUE_ORIGIN = INTERNAL, 239 VALUE_ORIGIN_BITS = 4, 240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 241 242 // flag kind 243 KIND_PRODUCT = 1 << 4, 244 KIND_MANAGEABLE = 1 << 5, 245 KIND_DIAGNOSTIC = 1 << 6, 246 KIND_EXPERIMENTAL = 1 << 7, 247 KIND_NOT_PRODUCT = 1 << 8, 248 KIND_DEVELOP = 1 << 9, 249 KIND_PLATFORM_DEPENDENT = 1 << 10, 250 KIND_READ_WRITE = 1 << 11, 251 KIND_C1 = 1 << 12, 252 KIND_C2 = 1 << 13, 253 KIND_ARCH = 1 << 14, 254 KIND_SHARK = 1 << 15, 255 KIND_LP64_PRODUCT = 1 << 16, 256 KIND_COMMERCIAL = 1 << 17, 257 258 KIND_MASK = ~VALUE_ORIGIN_MASK 259 }; 260 261 enum Error { 262 // no error 263 SUCCESS = 0, 264 // flag name is missing 265 MISSING_NAME, 266 // flag value is missing 267 MISSING_VALUE, 268 // error parsing the textual form of the value 269 WRONG_FORMAT, 270 // flag is not writeable 271 NON_WRITABLE, 272 // flag value is outside of its bounds 273 OUT_OF_BOUNDS, 274 // flag value violates its constraint 275 VIOLATES_CONSTRAINT, 276 // there is no flag with the given name 277 INVALID_FLAG, 278 // other, unspecified error related to setting the flag 279 ERR_OTHER 280 }; 281 282 const char* _type; 283 const char* _name; 284 void* _addr; 285 NOT_PRODUCT(const char* _doc;) 286 Flags _flags; 287 288 // points to all Flags static array 289 static Flag* flags; 290 291 // number of flags 292 static size_t numFlags; 293 294 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 295 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 296 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 297 298 void check_writable(); 299 300 bool is_bool() const; 301 bool get_bool() const; 302 void set_bool(bool value); 303 304 bool is_int() const; 305 int get_int() const; 306 void set_int(int value); 307 308 bool is_uint() const; 309 uint get_uint() const; 310 void set_uint(uint value); 311 312 bool is_intx() const; 313 intx get_intx() const; 314 void set_intx(intx value); 315 316 bool is_uintx() const; 317 uintx get_uintx() const; 318 void set_uintx(uintx value); 319 320 bool is_uint64_t() const; 321 uint64_t get_uint64_t() const; 322 void set_uint64_t(uint64_t value); 323 324 bool is_size_t() const; 325 size_t get_size_t() const; 326 void set_size_t(size_t value); 327 328 bool is_double() const; 329 double get_double() const; 330 void set_double(double value); 331 332 bool is_ccstr() const; 333 bool ccstr_accumulates() const; 334 ccstr get_ccstr() const; 335 void set_ccstr(ccstr value); 336 337 Flags get_origin(); 338 void set_origin(Flags origin); 339 340 bool is_default(); 341 bool is_ergonomic(); 342 bool is_command_line(); 343 344 bool is_product() const; 345 bool is_manageable() const; 346 bool is_diagnostic() const; 347 bool is_experimental() const; 348 bool is_notproduct() const; 349 bool is_develop() const; 350 bool is_read_write() const; 351 bool is_commercial() const; 352 353 bool is_constant_in_binary() const; 354 355 bool is_unlocker() const; 356 bool is_unlocked() const; 357 bool is_writeable() const; 358 bool is_external() const; 359 360 bool is_unlocker_ext() const; 361 bool is_unlocked_ext() const; 362 bool is_writeable_ext() const; 363 bool is_external_ext() const; 364 365 void unlock_diagnostic(); 366 367 void get_locked_message(char*, int) const; 368 void get_locked_message_ext(char*, int) const; 369 370 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 371 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 372 void print_kind(outputStream* st); 373 void print_as_flag(outputStream* st); 374 375 static const char* flag_error_str(Flag::Error error); 376 }; 377 378 // debug flags control various aspects of the VM and are global accessible 379 380 // use FlagSetting to temporarily change some debug flag 381 // e.g. FlagSetting fs(DebugThisAndThat, true); 382 // restored to previous value upon leaving scope 383 class FlagSetting { 384 bool val; 385 bool* flag; 386 public: 387 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 388 ~FlagSetting() { *flag = val; } 389 }; 390 391 392 class CounterSetting { 393 intx* counter; 394 public: 395 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 396 ~CounterSetting() { (*counter)--; } 397 }; 398 399 class IntFlagSetting { 400 int val; 401 int* flag; 402 public: 403 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 404 ~IntFlagSetting() { *flag = val; } 405 }; 406 407 class UIntFlagSetting { 408 uint val; 409 uint* flag; 410 public: 411 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 412 ~UIntFlagSetting() { *flag = val; } 413 }; 414 415 class UIntXFlagSetting { 416 uintx val; 417 uintx* flag; 418 public: 419 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 420 ~UIntXFlagSetting() { *flag = val; } 421 }; 422 423 class DoubleFlagSetting { 424 double val; 425 double* flag; 426 public: 427 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 428 ~DoubleFlagSetting() { *flag = val; } 429 }; 430 431 class SizeTFlagSetting { 432 size_t val; 433 size_t* flag; 434 public: 435 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 436 ~SizeTFlagSetting() { *flag = val; } 437 }; 438 439 440 class CommandLineFlags { 441 public: 442 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 443 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); } 444 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 445 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 446 447 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 448 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); } 449 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 450 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 451 452 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 453 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); } 454 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 455 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 456 457 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 458 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); } 459 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 460 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 461 462 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 463 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); } 464 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 465 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 466 467 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 468 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); } 469 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 470 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 471 472 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 473 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); } 474 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 475 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 476 477 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 478 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); } 479 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 480 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 481 482 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 483 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); } 484 // Contract: Flag will make private copy of the incoming value. 485 // Outgoing value is always malloc-ed, and caller MUST call free. 486 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 487 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 488 489 // Returns false if name is not a command line flag. 490 static bool wasSetOnCmdline(const char* name, bool* value); 491 static void printSetFlags(outputStream* out); 492 493 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 494 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 495 496 static void verify() PRODUCT_RETURN; 497 }; 498 499 // use this for flags that are true by default in the debug version but 500 // false in the optimized version, and vice versa 501 #ifdef ASSERT 502 #define trueInDebug true 503 #define falseInDebug false 504 #else 505 #define trueInDebug false 506 #define falseInDebug true 507 #endif 508 509 // use this for flags that are true per default in the product build 510 // but false in development builds, and vice versa 511 #ifdef PRODUCT 512 #define trueInProduct true 513 #define falseInProduct false 514 #else 515 #define trueInProduct false 516 #define falseInProduct true 517 #endif 518 519 #ifdef JAVASE_EMBEDDED 520 #define falseInEmbedded false 521 #else 522 #define falseInEmbedded true 523 #endif 524 525 // develop flags are settable / visible only during development and are constant in the PRODUCT version 526 // product flags are always settable / visible 527 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 528 529 // A flag must be declared with one of the following types: 530 // bool, intx, uintx, size_t, ccstr, double, or uint64_t. 531 // The type "ccstr" is an alias for "const char*" and is used 532 // only in this file, because the macrology requires single-token type names. 533 534 // Note: Diagnostic options not meant for VM tuning or for product modes. 535 // They are to be used for VM quality assurance or field diagnosis 536 // of VM bugs. They are hidden so that users will not be encouraged to 537 // try them as if they were VM ordinary execution options. However, they 538 // are available in the product version of the VM. Under instruction 539 // from support engineers, VM customers can turn them on to collect 540 // diagnostic information about VM problems. To use a VM diagnostic 541 // option, you must first specify +UnlockDiagnosticVMOptions. 542 // (This master switch also affects the behavior of -Xprintflags.) 543 // 544 // experimental flags are in support of features that are not 545 // part of the officially supported product, but are available 546 // for experimenting with. They could, for example, be performance 547 // features that may not have undergone full or rigorous QA, but which may 548 // help performance in some cases and released for experimentation 549 // by the community of users and developers. This flag also allows one to 550 // be able to build a fully supported product that nonetheless also 551 // ships with some unsupported, lightly tested, experimental features. 552 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 553 // UnlockExperimentalVMOptions flag, which allows the control and 554 // modification of the experimental flags. 555 // 556 // Nota bene: neither diagnostic nor experimental options should be used casually, 557 // and they are not supported on production loads, except under explicit 558 // direction from support engineers. 559 // 560 // manageable flags are writeable external product flags. 561 // They are dynamically writeable through the JDK management interface 562 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 563 // These flags are external exported interface (see CCC). The list of 564 // manageable flags can be queried programmatically through the management 565 // interface. 566 // 567 // A flag can be made as "manageable" only if 568 // - the flag is defined in a CCC as an external exported interface. 569 // - the VM implementation supports dynamic setting of the flag. 570 // This implies that the VM must *always* query the flag variable 571 // and not reuse state related to the flag state at any given time. 572 // - you want the flag to be queried programmatically by the customers. 573 // 574 // product_rw flags are writeable internal product flags. 575 // They are like "manageable" flags but for internal/private use. 576 // The list of product_rw flags are internal/private flags which 577 // may be changed/removed in a future release. It can be set 578 // through the management interface to get/set value 579 // when the name of flag is supplied. 580 // 581 // A flag can be made as "product_rw" only if 582 // - the VM implementation supports dynamic setting of the flag. 583 // This implies that the VM must *always* query the flag variable 584 // and not reuse state related to the flag state at any given time. 585 // 586 // Note that when there is a need to support develop flags to be writeable, 587 // it can be done in the same way as product_rw. 588 // 589 // range is a macro that will expand to min and max arguments for range 590 // checking code if provided - see commandLineFlagRangeList.hpp 591 // 592 // constraint is a macro that will expand to custom function call 593 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 594 // 595 596 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \ 597 \ 598 lp64_product(bool, UseCompressedOops, false, \ 599 "Use 32-bit object references in 64-bit VM. " \ 600 "lp64_product means flag is always constant in 32 bit VM") \ 601 \ 602 lp64_product(bool, UseCompressedClassPointers, false, \ 603 "Use 32-bit class pointers in 64-bit VM. " \ 604 "lp64_product means flag is always constant in 32 bit VM") \ 605 \ 606 notproduct(bool, CheckCompressedOops, true, \ 607 "Generate checks in encoding/decoding code in debug VM") \ 608 \ 609 product_pd(size_t, HeapBaseMinAddress, \ 610 "OS specific low limit for heap base address") \ 611 \ 612 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 613 "Heap allocation steps through preferred address regions to find" \ 614 " where it can allocate the heap. Number of steps to take per " \ 615 "region.") \ 616 range(1, max_uintx) \ 617 \ 618 diagnostic(bool, PrintCompressedOopsMode, false, \ 619 "Print compressed oops base address and encoding mode") \ 620 \ 621 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 622 "Default object alignment in bytes, 8 is minimum") \ 623 range(8, 256) \ 624 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 625 \ 626 product(bool, AssumeMP, false, \ 627 "Instruct the VM to assume multiple processors are available") \ 628 \ 629 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 630 /* removal testing. It was supposed to be removed before FCS but has */ \ 631 /* been re-added (see 6401008) */ \ 632 product_pd(bool, UseMembar, \ 633 "(Unstable) Issues membars on thread state transitions") \ 634 \ 635 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 636 "Clean the chunk pool asynchronously") \ 637 \ 638 experimental(bool, AlwaysSafeConstructors, false, \ 639 "Force safe construction, as if all fields are final.") \ 640 \ 641 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 642 "Enable normal processing of flags relating to field diagnostics")\ 643 \ 644 experimental(bool, UnlockExperimentalVMOptions, false, \ 645 "Enable normal processing of flags relating to experimental " \ 646 "features") \ 647 \ 648 product(bool, JavaMonitorsInStackTrace, true, \ 649 "Print information about Java monitor locks when the stacks are" \ 650 "dumped") \ 651 \ 652 product_pd(bool, UseLargePages, \ 653 "Use large page memory") \ 654 \ 655 product_pd(bool, UseLargePagesIndividualAllocation, \ 656 "Allocate large pages individually for better affinity") \ 657 \ 658 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 659 "Fail large pages individual allocation") \ 660 \ 661 product(bool, UseLargePagesInMetaspace, false, \ 662 "Use large page memory in metaspace. " \ 663 "Only used if UseLargePages is enabled.") \ 664 \ 665 develop(bool, TracePageSizes, false, \ 666 "Trace page size selection and usage") \ 667 \ 668 product(bool, UseNUMA, false, \ 669 "Use NUMA if available") \ 670 \ 671 product(bool, UseNUMAInterleaving, false, \ 672 "Interleave memory across NUMA nodes if available") \ 673 \ 674 product(size_t, NUMAInterleaveGranularity, 2*M, \ 675 "Granularity to use for NUMA interleaving on Windows OS") \ 676 \ 677 product(bool, ForceNUMA, false, \ 678 "Force NUMA optimizations on single-node/UMA systems") \ 679 \ 680 product(uintx, NUMAChunkResizeWeight, 20, \ 681 "Percentage (0-100) used to weight the current sample when " \ 682 "computing exponentially decaying average for " \ 683 "AdaptiveNUMAChunkSizing") \ 684 range(0, 100) \ 685 \ 686 product(size_t, NUMASpaceResizeRate, 1*G, \ 687 "Do not reallocate more than this amount per collection") \ 688 \ 689 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 690 "Enable adaptive chunk sizing for NUMA") \ 691 \ 692 product(bool, NUMAStats, false, \ 693 "Print NUMA stats in detailed heap information") \ 694 \ 695 product(uintx, NUMAPageScanRate, 256, \ 696 "Maximum number of pages to include in the page scan procedure") \ 697 \ 698 product_pd(bool, NeedsDeoptSuspend, \ 699 "True for register window machines (sparc/ia64)") \ 700 \ 701 product(intx, UseSSE, 99, \ 702 "Highest supported SSE instructions set on x86/x64") \ 703 \ 704 product(bool, UseAES, false, \ 705 "Control whether AES instructions can be used on x86/x64") \ 706 \ 707 product(bool, UseSHA, false, \ 708 "Control whether SHA instructions can be used " \ 709 "on SPARC and on ARM") \ 710 \ 711 product(bool, UseGHASHIntrinsics, false, \ 712 "Use intrinsics for GHASH versions of crypto") \ 713 \ 714 product(size_t, LargePageSizeInBytes, 0, \ 715 "Large page size (0 to let VM choose the page size)") \ 716 \ 717 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 718 "Use large pages if maximum heap is at least this big") \ 719 \ 720 product(bool, ForceTimeHighResolution, false, \ 721 "Using high time resolution (for Win32 only)") \ 722 \ 723 develop(bool, TraceItables, false, \ 724 "Trace initialization and use of itables") \ 725 \ 726 develop(bool, TracePcPatching, false, \ 727 "Trace usage of frame::patch_pc") \ 728 \ 729 develop(bool, TraceJumps, false, \ 730 "Trace assembly jumps in thread ring buffer") \ 731 \ 732 develop(bool, TraceRelocator, false, \ 733 "Trace the bytecode relocator") \ 734 \ 735 develop(bool, TraceLongCompiles, false, \ 736 "Print out every time compilation is longer than " \ 737 "a given threshold") \ 738 \ 739 develop(bool, SafepointALot, false, \ 740 "Generate a lot of safepoints. This works with " \ 741 "GuaranteedSafepointInterval") \ 742 \ 743 product_pd(bool, BackgroundCompilation, \ 744 "A thread requesting compilation is not blocked during " \ 745 "compilation") \ 746 \ 747 product(bool, PrintVMQWaitTime, false, \ 748 "Print out the waiting time in VM operation queue") \ 749 \ 750 develop(bool, TraceOopMapGeneration, false, \ 751 "Show OopMapGeneration") \ 752 \ 753 product(bool, MethodFlushing, true, \ 754 "Reclamation of zombie and not-entrant methods") \ 755 \ 756 develop(bool, VerifyStack, false, \ 757 "Verify stack of each thread when it is entering a runtime call") \ 758 \ 759 diagnostic(bool, ForceUnreachable, false, \ 760 "Make all non code cache addresses to be unreachable by " \ 761 "forcing use of 64bit literal fixups") \ 762 \ 763 notproduct(bool, StressDerivedPointers, false, \ 764 "Force scavenge when a derived pointer is detected on stack " \ 765 "after rtm call") \ 766 \ 767 develop(bool, TraceDerivedPointers, false, \ 768 "Trace traversal of derived pointers on stack") \ 769 \ 770 notproduct(bool, TraceCodeBlobStacks, false, \ 771 "Trace stack-walk of codeblobs") \ 772 \ 773 product(bool, PrintJNIResolving, false, \ 774 "Used to implement -v:jni") \ 775 \ 776 notproduct(bool, PrintRewrites, false, \ 777 "Print methods that are being rewritten") \ 778 \ 779 product(bool, UseInlineCaches, true, \ 780 "Use Inline Caches for virtual calls ") \ 781 \ 782 develop(bool, InlineArrayCopy, true, \ 783 "Inline arraycopy native that is known to be part of " \ 784 "base library DLL") \ 785 \ 786 develop(bool, InlineObjectHash, true, \ 787 "Inline Object::hashCode() native that is known to be part " \ 788 "of base library DLL") \ 789 \ 790 develop(bool, InlineNatives, true, \ 791 "Inline natives that are known to be part of base library DLL") \ 792 \ 793 develop(bool, InlineMathNatives, true, \ 794 "Inline SinD, CosD, etc.") \ 795 \ 796 develop(bool, InlineClassNatives, true, \ 797 "Inline Class.isInstance, etc") \ 798 \ 799 develop(bool, InlineThreadNatives, true, \ 800 "Inline Thread.currentThread, etc") \ 801 \ 802 develop(bool, InlineUnsafeOps, true, \ 803 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 804 \ 805 product(bool, CriticalJNINatives, true, \ 806 "Check for critical JNI entry points") \ 807 \ 808 notproduct(bool, StressCriticalJNINatives, false, \ 809 "Exercise register saving code in critical natives") \ 810 \ 811 product(bool, UseSSE42Intrinsics, false, \ 812 "SSE4.2 versions of intrinsics") \ 813 \ 814 product(bool, UseAESIntrinsics, false, \ 815 "Use intrinsics for AES versions of crypto") \ 816 \ 817 product(bool, UseSHA1Intrinsics, false, \ 818 "Use intrinsics for SHA-1 crypto hash function. " \ 819 "Requires that UseSHA is enabled.") \ 820 \ 821 product(bool, UseSHA256Intrinsics, false, \ 822 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 823 "Requires that UseSHA is enabled.") \ 824 \ 825 product(bool, UseSHA512Intrinsics, false, \ 826 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 827 "Requires that UseSHA is enabled.") \ 828 \ 829 product(bool, UseCRC32Intrinsics, false, \ 830 "use intrinsics for java.util.zip.CRC32") \ 831 \ 832 product(bool, UseCRC32CIntrinsics, false, \ 833 "use intrinsics for java.util.zip.CRC32C") \ 834 \ 835 diagnostic(ccstrlist, DisableIntrinsic, "", \ 836 "do not expand intrinsics whose (internal) names appear here") \ 837 \ 838 develop(bool, TraceCallFixup, false, \ 839 "Trace all call fixups") \ 840 \ 841 develop(bool, DeoptimizeALot, false, \ 842 "Deoptimize at every exit from the runtime system") \ 843 \ 844 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 845 "A comma separated list of bcis to deoptimize at") \ 846 \ 847 product(bool, DeoptimizeRandom, false, \ 848 "Deoptimize random frames on random exit from the runtime system")\ 849 \ 850 notproduct(bool, ZombieALot, false, \ 851 "Create zombies (non-entrant) at exit from the runtime system") \ 852 \ 853 product(bool, UnlinkSymbolsALot, false, \ 854 "Unlink unreferenced symbols from the symbol table at safepoints")\ 855 \ 856 notproduct(bool, WalkStackALot, false, \ 857 "Trace stack (no print) at every exit from the runtime system") \ 858 \ 859 product(bool, Debugging, false, \ 860 "Set when executing debug methods in debug.cpp " \ 861 "(to prevent triggering assertions)") \ 862 \ 863 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 864 "Enable strict checks that safepoints cannot happen for threads " \ 865 "that use No_Safepoint_Verifier") \ 866 \ 867 notproduct(bool, VerifyLastFrame, false, \ 868 "Verify oops on last frame on entry to VM") \ 869 \ 870 develop(bool, TraceHandleAllocation, false, \ 871 "Print out warnings when suspiciously many handles are allocated")\ 872 \ 873 product(bool, FailOverToOldVerifier, true, \ 874 "Fail over to old verifier when split verifier fails") \ 875 \ 876 develop(bool, ShowSafepointMsgs, false, \ 877 "Show message about safepoint synchronization") \ 878 \ 879 product(bool, SafepointTimeout, false, \ 880 "Time out and warn or fail after SafepointTimeoutDelay " \ 881 "milliseconds if failed to reach safepoint") \ 882 \ 883 develop(bool, DieOnSafepointTimeout, false, \ 884 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 885 \ 886 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 887 /* typically, at most a few retries are needed */ \ 888 product(intx, SuspendRetryCount, 50, \ 889 "Maximum retry count for an external suspend request") \ 890 \ 891 product(intx, SuspendRetryDelay, 5, \ 892 "Milliseconds to delay per retry (* current_retry_count)") \ 893 \ 894 product(bool, AssertOnSuspendWaitFailure, false, \ 895 "Assert/Guarantee on external suspend wait failure") \ 896 \ 897 product(bool, TraceSuspendWaitFailures, false, \ 898 "Trace external suspend wait failures") \ 899 \ 900 product(bool, MaxFDLimit, true, \ 901 "Bump the number of file descriptors to maximum in Solaris") \ 902 \ 903 diagnostic(bool, LogEvents, true, \ 904 "Enable the various ring buffer event logs") \ 905 \ 906 diagnostic(uintx, LogEventsBufferEntries, 10, \ 907 "Number of ring buffer event logs") \ 908 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 909 \ 910 product(bool, BytecodeVerificationRemote, true, \ 911 "Enable the Java bytecode verifier for remote classes") \ 912 \ 913 product(bool, BytecodeVerificationLocal, false, \ 914 "Enable the Java bytecode verifier for local classes") \ 915 \ 916 develop(bool, ForceFloatExceptions, trueInDebug, \ 917 "Force exceptions on FP stack under/overflow") \ 918 \ 919 develop(bool, VerifyStackAtCalls, false, \ 920 "Verify that the stack pointer is unchanged after calls") \ 921 \ 922 develop(bool, TraceJavaAssertions, false, \ 923 "Trace java language assertions") \ 924 \ 925 notproduct(bool, CheckAssertionStatusDirectives, false, \ 926 "Temporary - see javaClasses.cpp") \ 927 \ 928 notproduct(bool, PrintMallocFree, false, \ 929 "Trace calls to C heap malloc/free allocation") \ 930 \ 931 product(bool, PrintOopAddress, false, \ 932 "Always print the location of the oop") \ 933 \ 934 notproduct(bool, VerifyCodeCache, false, \ 935 "Verify code cache on memory allocation/deallocation") \ 936 \ 937 develop(bool, ZapDeadCompiledLocals, false, \ 938 "Zap dead locals in compiler frames") \ 939 \ 940 notproduct(bool, ZapDeadLocalsOld, false, \ 941 "Zap dead locals (old version, zaps all frames when " \ 942 "entering the VM") \ 943 \ 944 notproduct(bool, CheckOopishValues, false, \ 945 "Warn if value contains oop (requires ZapDeadLocals)") \ 946 \ 947 develop(bool, UseMallocOnly, false, \ 948 "Use only malloc/free for allocation (no resource area/arena)") \ 949 \ 950 develop(bool, PrintMalloc, false, \ 951 "Print all malloc/free calls") \ 952 \ 953 develop(bool, PrintMallocStatistics, false, \ 954 "Print malloc/free statistics") \ 955 \ 956 develop(bool, ZapResourceArea, trueInDebug, \ 957 "Zap freed resource/arena space with 0xABABABAB") \ 958 \ 959 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 960 "Zap freed VM handle space with 0xBCBCBCBC") \ 961 \ 962 develop(bool, ZapJNIHandleArea, trueInDebug, \ 963 "Zap freed JNI handle space with 0xFEFEFEFE") \ 964 \ 965 notproduct(bool, ZapStackSegments, trueInDebug, \ 966 "Zap allocated/freed stack segments with 0xFADFADED") \ 967 \ 968 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 969 "Zap unused heap space with 0xBAADBABE") \ 970 \ 971 develop(bool, TraceZapUnusedHeapArea, false, \ 972 "Trace zapping of unused heap space") \ 973 \ 974 develop(bool, CheckZapUnusedHeapArea, false, \ 975 "Check zapping of unused heap space") \ 976 \ 977 develop(bool, ZapFillerObjects, trueInDebug, \ 978 "Zap filler objects with 0xDEAFBABE") \ 979 \ 980 develop(bool, PrintVMMessages, true, \ 981 "Print VM messages on console") \ 982 \ 983 product(bool, PrintGCApplicationConcurrentTime, false, \ 984 "Print the time the application has been running") \ 985 \ 986 product(bool, PrintGCApplicationStoppedTime, false, \ 987 "Print the time the application has been stopped") \ 988 \ 989 diagnostic(bool, VerboseVerification, false, \ 990 "Display detailed verification details") \ 991 \ 992 notproduct(uintx, ErrorHandlerTest, 0, \ 993 "If > 0, provokes an error after VM initialization; the value " \ 994 "determines which error to provoke. See test_error_handler() " \ 995 "in debug.cpp.") \ 996 \ 997 notproduct(uintx, TestCrashInErrorHandler, 0, \ 998 "If > 0, provokes an error inside VM error handler (a secondary " \ 999 "crash). see test_error_handler() in debug.cpp.") \ 1000 \ 1001 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 1002 "If true, tests SafeFetch inside error handler.") \ 1003 \ 1004 develop(bool, Verbose, false, \ 1005 "Print additional debugging information from other modes") \ 1006 \ 1007 develop(bool, PrintMiscellaneous, false, \ 1008 "Print uncategorized debugging information (requires +Verbose)") \ 1009 \ 1010 develop(bool, WizardMode, false, \ 1011 "Print much more debugging information") \ 1012 \ 1013 product(bool, ShowMessageBoxOnError, false, \ 1014 "Keep process alive on VM fatal error") \ 1015 \ 1016 product(bool, CreateCoredumpOnCrash, true, \ 1017 "Create core/mini dump on VM fatal error") \ 1018 \ 1019 product(uintx, ErrorLogTimeout, 2 * 60, \ 1020 "Timeout, in seconds, to limit the time spent on writing an " \ 1021 "error log in case of a crash.") \ 1022 \ 1023 product_pd(bool, UseOSErrorReporting, \ 1024 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 1025 \ 1026 product(bool, SuppressFatalErrorMessage, false, \ 1027 "Report NO fatal error message (avoid deadlock)") \ 1028 \ 1029 product(ccstrlist, OnError, "", \ 1030 "Run user-defined commands on fatal error; see VMError.cpp " \ 1031 "for examples") \ 1032 \ 1033 product(ccstrlist, OnOutOfMemoryError, "", \ 1034 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 1035 \ 1036 manageable(bool, HeapDumpBeforeFullGC, false, \ 1037 "Dump heap to file before any major stop-the-world GC") \ 1038 \ 1039 manageable(bool, HeapDumpAfterFullGC, false, \ 1040 "Dump heap to file after any major stop-the-world GC") \ 1041 \ 1042 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 1043 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 1044 \ 1045 manageable(ccstr, HeapDumpPath, NULL, \ 1046 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 1047 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 1048 "in the working directory)") \ 1049 \ 1050 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 1051 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 1052 "when the heap usage is larger than this") \ 1053 \ 1054 develop(size_t, HeapDumpSegmentSize, 1*G, \ 1055 "Approximate segment size when generating a segmented heap dump") \ 1056 \ 1057 develop(bool, BreakAtWarning, false, \ 1058 "Execute breakpoint upon encountering VM warning") \ 1059 \ 1060 develop(bool, TraceVMOperation, false, \ 1061 "Trace VM operations") \ 1062 \ 1063 develop(bool, UseFakeTimers, false, \ 1064 "Tell whether the VM should use system time or a fake timer") \ 1065 \ 1066 product(ccstr, NativeMemoryTracking, "off", \ 1067 "Native memory tracking options") \ 1068 \ 1069 diagnostic(bool, PrintNMTStatistics, false, \ 1070 "Print native memory tracking summary data if it is on") \ 1071 \ 1072 diagnostic(bool, LogCompilation, false, \ 1073 "Log compilation activity in detail to LogFile") \ 1074 \ 1075 product(bool, PrintCompilation, false, \ 1076 "Print compilations") \ 1077 \ 1078 diagnostic(bool, TraceNMethodInstalls, false, \ 1079 "Trace nmethod installation") \ 1080 \ 1081 diagnostic(intx, ScavengeRootsInCode, 2, \ 1082 "0: do not allow scavengable oops in the code cache; " \ 1083 "1: allow scavenging from the code cache; " \ 1084 "2: emit as many constants as the compiler can see") \ 1085 range(0, 2) \ 1086 \ 1087 product(bool, AlwaysRestoreFPU, false, \ 1088 "Restore the FPU control word after every JNI call (expensive)") \ 1089 \ 1090 diagnostic(bool, PrintCompilation2, false, \ 1091 "Print additional statistics per compilation") \ 1092 \ 1093 diagnostic(bool, PrintAdapterHandlers, false, \ 1094 "Print code generated for i2c/c2i adapters") \ 1095 \ 1096 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1097 "Verify that i2c/c2i adapters are called properly") \ 1098 \ 1099 develop(bool, VerifyAdapterSharing, false, \ 1100 "Verify that the code for shared adapters is the equivalent") \ 1101 \ 1102 diagnostic(bool, PrintAssembly, false, \ 1103 "Print assembly code (using external disassembler.so)") \ 1104 \ 1105 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1106 "Print options string passed to disassembler.so") \ 1107 \ 1108 diagnostic(bool, PrintNMethods, false, \ 1109 "Print assembly code for nmethods when generated") \ 1110 \ 1111 diagnostic(bool, PrintNativeNMethods, false, \ 1112 "Print assembly code for native nmethods when generated") \ 1113 \ 1114 develop(bool, PrintDebugInfo, false, \ 1115 "Print debug information for all nmethods when generated") \ 1116 \ 1117 develop(bool, PrintRelocations, false, \ 1118 "Print relocation information for all nmethods when generated") \ 1119 \ 1120 develop(bool, PrintDependencies, false, \ 1121 "Print dependency information for all nmethods when generated") \ 1122 \ 1123 develop(bool, PrintExceptionHandlers, false, \ 1124 "Print exception handler tables for all nmethods when generated") \ 1125 \ 1126 develop(bool, StressCompiledExceptionHandlers, false, \ 1127 "Exercise compiled exception handlers") \ 1128 \ 1129 develop(bool, InterceptOSException, false, \ 1130 "Start debugger when an implicit OS (e.g. NULL) " \ 1131 "exception happens") \ 1132 \ 1133 product(bool, PrintCodeCache, false, \ 1134 "Print the code cache memory usage when exiting") \ 1135 \ 1136 develop(bool, PrintCodeCache2, false, \ 1137 "Print detailed usage information on the code cache when exiting")\ 1138 \ 1139 product(bool, PrintCodeCacheOnCompilation, false, \ 1140 "Print the code cache memory usage each time a method is " \ 1141 "compiled") \ 1142 \ 1143 diagnostic(bool, PrintStubCode, false, \ 1144 "Print generated stub code") \ 1145 \ 1146 product(bool, StackTraceInThrowable, true, \ 1147 "Collect backtrace in throwable when exception happens") \ 1148 \ 1149 product(bool, OmitStackTraceInFastThrow, true, \ 1150 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1151 \ 1152 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1153 "Print bytecode statistics when dumping profiler output") \ 1154 \ 1155 product(bool, ProfilerRecordPC, false, \ 1156 "Collect ticks for each 16 byte interval of compiled code") \ 1157 \ 1158 product(bool, ProfileVM, false, \ 1159 "Profile ticks that fall within VM (either in the VM Thread " \ 1160 "or VM code called through stubs)") \ 1161 \ 1162 product(bool, ProfileIntervals, false, \ 1163 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1164 \ 1165 notproduct(bool, ProfilerCheckIntervals, false, \ 1166 "Collect and print information on spacing of profiler ticks") \ 1167 \ 1168 product(bool, PrintWarnings, true, \ 1169 "Print JVM warnings to output stream") \ 1170 \ 1171 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1172 "Print warnings for stalled SpinLocks") \ 1173 \ 1174 product(bool, RegisterFinalizersAtInit, true, \ 1175 "Register finalizable objects at end of Object.<init> or " \ 1176 "after allocation") \ 1177 \ 1178 develop(bool, RegisterReferences, true, \ 1179 "Tell whether the VM should register soft/weak/final/phantom " \ 1180 "references") \ 1181 \ 1182 develop(bool, IgnoreRewrites, false, \ 1183 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1184 "This is unsafe!") \ 1185 \ 1186 develop(bool, PrintCodeCacheExtension, false, \ 1187 "Print extension of code cache") \ 1188 \ 1189 develop(bool, UsePrivilegedStack, true, \ 1190 "Enable the security JVM functions") \ 1191 \ 1192 develop(bool, ProtectionDomainVerification, true, \ 1193 "Verify protection domain before resolution in system dictionary")\ 1194 \ 1195 product(bool, ClassUnloading, true, \ 1196 "Do unloading of classes") \ 1197 \ 1198 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1199 "Do unloading of classes with a concurrent marking cycle") \ 1200 \ 1201 develop(bool, DisableStartThread, false, \ 1202 "Disable starting of additional Java threads " \ 1203 "(for debugging only)") \ 1204 \ 1205 develop(bool, MemProfiling, false, \ 1206 "Write memory usage profiling to log file") \ 1207 \ 1208 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1209 "Print the system dictionary at exit") \ 1210 \ 1211 experimental(intx, PredictedLoadedClassCount, 0, \ 1212 "Experimental: Tune loaded class cache starting size") \ 1213 \ 1214 diagnostic(bool, UnsyncloadClass, false, \ 1215 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1216 "class loader must call VM synchronized for findClass " \ 1217 "and defineClass.") \ 1218 \ 1219 product(bool, AlwaysLockClassLoader, false, \ 1220 "Require the VM to acquire the class loader lock before calling " \ 1221 "loadClass() even for class loaders registering " \ 1222 "as parallel capable") \ 1223 \ 1224 product(bool, AllowParallelDefineClass, false, \ 1225 "Allow parallel defineClass requests for class loaders " \ 1226 "registering as parallel capable") \ 1227 \ 1228 product(bool, MustCallLoadClassInternal, false, \ 1229 "Call loadClassInternal() rather than loadClass()") \ 1230 \ 1231 product_pd(bool, DontYieldALot, \ 1232 "Throw away obvious excess yield calls") \ 1233 \ 1234 product_pd(bool, ConvertSleepToYield, \ 1235 "Convert sleep(0) to thread yield " \ 1236 "(may be off for Solaris to improve GUI)") \ 1237 \ 1238 product(bool, ConvertYieldToSleep, false, \ 1239 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1240 "behavior") \ 1241 \ 1242 develop(bool, UseDetachedThreads, true, \ 1243 "Use detached threads that are recycled upon termination " \ 1244 "(for Solaris only)") \ 1245 \ 1246 product(bool, UseLWPSynchronization, true, \ 1247 "Use LWP-based instead of libthread-based synchronization " \ 1248 "(SPARC only)") \ 1249 \ 1250 experimental(ccstr, SyncKnobs, NULL, \ 1251 "(Unstable) Various monitor synchronization tunables") \ 1252 \ 1253 experimental(intx, EmitSync, 0, \ 1254 "(Unsafe, Unstable) " \ 1255 "Control emission of inline sync fast-path code") \ 1256 \ 1257 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1258 \ 1259 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1260 \ 1261 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1262 "Experimental Sync flags") \ 1263 \ 1264 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1265 \ 1266 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1267 \ 1268 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1269 \ 1270 experimental(intx, hashCode, 5, \ 1271 "(Unstable) select hashCode generation algorithm") \ 1272 \ 1273 experimental(intx, WorkAroundNPTLTimedWaitHang, 0, \ 1274 "(Unstable, Linux-specific) " \ 1275 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1276 \ 1277 product(bool, FilterSpuriousWakeups, true, \ 1278 "When true prevents OS-level spurious, or premature, wakeups " \ 1279 "from Object.wait (Ignored for Windows)") \ 1280 \ 1281 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1282 \ 1283 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1284 \ 1285 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1286 \ 1287 develop(bool, UsePthreads, false, \ 1288 "Use pthread-based instead of libthread-based synchronization " \ 1289 "(SPARC only)") \ 1290 \ 1291 product(bool, ReduceSignalUsage, false, \ 1292 "Reduce the use of OS signals in Java and/or the VM") \ 1293 \ 1294 develop_pd(bool, ShareVtableStubs, \ 1295 "Share vtable stubs (smaller code but worse branch prediction") \ 1296 \ 1297 develop(bool, LoadLineNumberTables, true, \ 1298 "Tell whether the class file parser loads line number tables") \ 1299 \ 1300 develop(bool, LoadLocalVariableTables, true, \ 1301 "Tell whether the class file parser loads local variable tables") \ 1302 \ 1303 develop(bool, LoadLocalVariableTypeTables, true, \ 1304 "Tell whether the class file parser loads local variable type" \ 1305 "tables") \ 1306 \ 1307 product(bool, AllowUserSignalHandlers, false, \ 1308 "Do not complain if the application installs signal handlers " \ 1309 "(Solaris & Linux only)") \ 1310 \ 1311 product(bool, UseSignalChaining, true, \ 1312 "Use signal-chaining to invoke signal handlers installed " \ 1313 "by the application (Solaris & Linux only)") \ 1314 \ 1315 product(bool, UseAltSigs, false, \ 1316 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1317 "internal signals (Solaris only)") \ 1318 \ 1319 product(bool, AllowJNIEnvProxy, false, \ 1320 "Allow JNIEnv proxies for jdbx") \ 1321 \ 1322 product(bool, JNIDetachReleasesMonitors, true, \ 1323 "JNI DetachCurrentThread releases monitors owned by thread") \ 1324 \ 1325 product(bool, RestoreMXCSROnJNICalls, false, \ 1326 "Restore MXCSR when returning from JNI calls") \ 1327 \ 1328 product(bool, CheckJNICalls, false, \ 1329 "Verify all arguments to JNI calls") \ 1330 \ 1331 product(bool, CheckEndorsedAndExtDirs, false, \ 1332 "Verify the endorsed and extension directories are not used") \ 1333 \ 1334 product(bool, UseFastJNIAccessors, true, \ 1335 "Use optimized versions of Get<Primitive>Field") \ 1336 \ 1337 product(intx, MaxJNILocalCapacity, 65536, \ 1338 "Maximum allowable local JNI handle capacity to " \ 1339 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1340 "where <= 0 is unlimited, default: 65536") \ 1341 \ 1342 product(bool, EagerXrunInit, false, \ 1343 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1344 "but not all -Xrun libraries may support the state of the VM " \ 1345 "at this time") \ 1346 \ 1347 product(bool, PreserveAllAnnotations, false, \ 1348 "Preserve RuntimeInvisibleAnnotations as well " \ 1349 "as RuntimeVisibleAnnotations") \ 1350 \ 1351 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1352 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1353 \ 1354 product(bool, UseXMMForArrayCopy, false, \ 1355 "Use SSE2 MOVQ instruction for Arraycopy") \ 1356 \ 1357 product(intx, FieldsAllocationStyle, 1, \ 1358 "0 - type based with oops first, " \ 1359 "1 - with oops last, " \ 1360 "2 - oops in super and sub classes are together") \ 1361 range(0, 2) \ 1362 \ 1363 product(bool, CompactFields, true, \ 1364 "Allocate nonstatic fields in gaps between previous fields") \ 1365 \ 1366 notproduct(bool, PrintFieldLayout, false, \ 1367 "Print field layout for each class") \ 1368 \ 1369 /* Need to limit the extent of the padding to reasonable size. */\ 1370 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1371 /* aggressive prefetching, while still leaving the room for segregating */\ 1372 /* among the distinct pages. */\ 1373 product(intx, ContendedPaddingWidth, 128, \ 1374 "How many bytes to pad the fields/classes marked @Contended with")\ 1375 range(0, 8192) \ 1376 constraint(ContendedPaddingWidthConstraintFunc,AtParse) \ 1377 \ 1378 product(bool, EnableContended, true, \ 1379 "Enable @Contended annotation support") \ 1380 \ 1381 product(bool, RestrictContended, true, \ 1382 "Restrict @Contended to trusted classes") \ 1383 \ 1384 product(bool, UseBiasedLocking, true, \ 1385 "Enable biased locking in JVM") \ 1386 \ 1387 product(intx, BiasedLockingStartupDelay, 4000, \ 1388 "Number of milliseconds to wait before enabling biased locking") \ 1389 \ 1390 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1391 "Print statistics of biased locking in JVM") \ 1392 \ 1393 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1394 "Threshold of number of revocations per type to try to " \ 1395 "rebias all objects in the heap of that type") \ 1396 \ 1397 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1398 "Threshold of number of revocations per type to permanently " \ 1399 "revoke biases of all objects in the heap of that type") \ 1400 \ 1401 product(intx, BiasedLockingDecayTime, 25000, \ 1402 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1403 "type after previous bulk rebias") \ 1404 \ 1405 /* tracing */ \ 1406 \ 1407 notproduct(bool, TraceRuntimeCalls, false, \ 1408 "Trace run-time calls") \ 1409 \ 1410 develop(bool, TraceJNICalls, false, \ 1411 "Trace JNI calls") \ 1412 \ 1413 develop(bool, StressRewriter, false, \ 1414 "Stress linktime bytecode rewriting") \ 1415 \ 1416 notproduct(bool, TraceJVMCalls, false, \ 1417 "Trace JVM calls") \ 1418 \ 1419 product(ccstr, TraceJVMTI, NULL, \ 1420 "Trace flags for JVMTI functions and events") \ 1421 \ 1422 /* This option can change an EMCP method into an obsolete method. */ \ 1423 /* This can affect tests that except specific methods to be EMCP. */ \ 1424 /* This option should be used with caution. */ \ 1425 product(bool, StressLdcRewrite, false, \ 1426 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1427 \ 1428 product(intx, TraceRedefineClasses, 0, \ 1429 "Trace level for JVMTI RedefineClasses") \ 1430 \ 1431 /* change to false by default sometime after Mustang */ \ 1432 product(bool, VerifyMergedCPBytecodes, true, \ 1433 "Verify bytecodes after RedefineClasses constant pool merging") \ 1434 \ 1435 develop(bool, TraceJNIHandleAllocation, false, \ 1436 "Trace allocation/deallocation of JNI handle blocks") \ 1437 \ 1438 develop(bool, TraceBytecodes, false, \ 1439 "Trace bytecode execution") \ 1440 \ 1441 develop(bool, TraceClassInitialization, false, \ 1442 "Trace class initialization") \ 1443 \ 1444 product(bool, TraceExceptions, false, \ 1445 "Trace exceptions") \ 1446 \ 1447 develop(bool, TraceICs, false, \ 1448 "Trace inline cache changes") \ 1449 \ 1450 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1451 "Trace method invocation counter overflow") \ 1452 \ 1453 develop(bool, TraceInlineCacheClearing, false, \ 1454 "Trace clearing of inline caches in nmethods") \ 1455 \ 1456 develop(bool, TraceDependencies, false, \ 1457 "Trace dependencies") \ 1458 \ 1459 develop(bool, VerifyDependencies, trueInDebug, \ 1460 "Exercise and verify the compilation dependency mechanism") \ 1461 \ 1462 develop(bool, TraceNewOopMapGeneration, false, \ 1463 "Trace OopMapGeneration") \ 1464 \ 1465 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1466 "Trace OopMapGeneration: print detailed cell states") \ 1467 \ 1468 develop(bool, TimeOopMap, false, \ 1469 "Time calls to GenerateOopMap::compute_map() in sum") \ 1470 \ 1471 develop(bool, TimeOopMap2, false, \ 1472 "Time calls to GenerateOopMap::compute_map() individually") \ 1473 \ 1474 develop(bool, TraceMonitorMismatch, false, \ 1475 "Trace monitor matching failures during OopMapGeneration") \ 1476 \ 1477 develop(bool, TraceOopMapRewrites, false, \ 1478 "Trace rewriting of method oops during oop map generation") \ 1479 \ 1480 develop(bool, TraceSafepoint, false, \ 1481 "Trace safepoint operations") \ 1482 \ 1483 develop(bool, TraceICBuffer, false, \ 1484 "Trace usage of IC buffer") \ 1485 \ 1486 develop(bool, TraceCompiledIC, false, \ 1487 "Trace changes of compiled IC") \ 1488 \ 1489 notproduct(bool, TraceZapDeadLocals, false, \ 1490 "Trace zapping dead locals") \ 1491 \ 1492 develop(bool, TraceStartupTime, false, \ 1493 "Trace setup time") \ 1494 \ 1495 develop(bool, TraceProtectionDomainVerification, false, \ 1496 "Trace protection domain verification") \ 1497 \ 1498 develop(bool, TraceClearedExceptions, false, \ 1499 "Print when an exception is forcibly cleared") \ 1500 \ 1501 product(bool, TraceClassResolution, false, \ 1502 "Trace all constant pool resolutions (for debugging)") \ 1503 \ 1504 product(bool, TraceBiasedLocking, false, \ 1505 "Trace biased locking in JVM") \ 1506 \ 1507 product(bool, TraceMonitorInflation, false, \ 1508 "Trace monitor inflation in JVM") \ 1509 \ 1510 /* gc */ \ 1511 \ 1512 product(bool, UseSerialGC, false, \ 1513 "Use the Serial garbage collector") \ 1514 \ 1515 product(bool, UseG1GC, false, \ 1516 "Use the Garbage-First garbage collector") \ 1517 \ 1518 product(bool, UseParallelGC, false, \ 1519 "Use the Parallel Scavenge garbage collector") \ 1520 \ 1521 product(bool, UseParallelOldGC, false, \ 1522 "Use the Parallel Old garbage collector") \ 1523 \ 1524 product(uintx, HeapMaximumCompactionInterval, 20, \ 1525 "How often should we maximally compact the heap (not allowing " \ 1526 "any dead space)") \ 1527 \ 1528 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1529 "The collection count for the first maximum compaction") \ 1530 \ 1531 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1532 "Use maximum compaction in the Parallel Old garbage collector " \ 1533 "for a system GC") \ 1534 \ 1535 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1536 "The mean used by the parallel compact dead wood " \ 1537 "limiter (a number between 0-100)") \ 1538 range(0, 100) \ 1539 \ 1540 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1541 "The standard deviation used by the parallel compact dead wood " \ 1542 "limiter (a number between 0-100)") \ 1543 range(0, 100) \ 1544 \ 1545 product(uint, ParallelGCThreads, 0, \ 1546 "Number of parallel threads parallel gc will use") \ 1547 \ 1548 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1549 "Use semaphore synchronization for the GC Threads, " \ 1550 "instead of synchronization based on mutexes") \ 1551 \ 1552 product(bool, UseDynamicNumberOfGCThreads, false, \ 1553 "Dynamically choose the number of parallel threads " \ 1554 "parallel gc will use") \ 1555 \ 1556 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1557 "Force dynamic selection of the number of " \ 1558 "parallel threads parallel gc will use to aid debugging") \ 1559 \ 1560 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1561 "Size of heap (bytes) per GC thread used in calculating the " \ 1562 "number of GC threads") \ 1563 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1564 \ 1565 product(bool, TraceDynamicGCThreads, false, \ 1566 "Trace the dynamic GC thread usage") \ 1567 \ 1568 develop(bool, ParallelOldGCSplitALot, false, \ 1569 "Provoke splitting (copying data from a young gen space to " \ 1570 "multiple destination spaces)") \ 1571 \ 1572 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1573 "How often to provoke splitting a young gen space") \ 1574 range(0, max_uintx) \ 1575 \ 1576 product(uint, ConcGCThreads, 0, \ 1577 "Number of threads concurrent gc will use") \ 1578 \ 1579 product(size_t, YoungPLABSize, 4096, \ 1580 "Size of young gen promotion LAB's (in HeapWords)") \ 1581 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 1582 \ 1583 product(size_t, OldPLABSize, 1024, \ 1584 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1585 of blocks to attempt to claim when refilling CMS LAB's") \ 1586 \ 1587 product(uintx, GCTaskTimeStampEntries, 200, \ 1588 "Number of time stamp entries per gc worker thread") \ 1589 range(1, max_uintx) \ 1590 \ 1591 product(bool, AlwaysTenure, false, \ 1592 "Always tenure objects in eden (ParallelGC only)") \ 1593 \ 1594 product(bool, NeverTenure, false, \ 1595 "Never tenure objects in eden, may tenure on overflow " \ 1596 "(ParallelGC only)") \ 1597 \ 1598 product(bool, ScavengeBeforeFullGC, true, \ 1599 "Scavenge young generation before each full GC.") \ 1600 \ 1601 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1602 "Allow scavenges to occur when to-space contains objects") \ 1603 \ 1604 product(bool, UseConcMarkSweepGC, false, \ 1605 "Use Concurrent Mark-Sweep GC in the old generation") \ 1606 \ 1607 product(bool, ExplicitGCInvokesConcurrent, false, \ 1608 "A System.gc() request invokes a concurrent collection; " \ 1609 "(effective only when using concurrent collectors)") \ 1610 \ 1611 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1612 "A System.gc() request invokes a concurrent collection and " \ 1613 "also unloads classes during such a concurrent gc cycle " \ 1614 "(effective only when UseConcMarkSweepGC)") \ 1615 \ 1616 product(bool, GCLockerInvokesConcurrent, false, \ 1617 "The exit of a JNI critical section necessitating a scavenge, " \ 1618 "also kicks off a background concurrent collection") \ 1619 \ 1620 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1621 "How much the GC can expand the eden by while the GC locker " \ 1622 "is active (as a percentage)") \ 1623 range(0, 100) \ 1624 \ 1625 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1626 "Number of times to retry allocations when " \ 1627 "blocked by the GC locker") \ 1628 \ 1629 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1630 "Use adaptive free lists in the CMS generation") \ 1631 \ 1632 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1633 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1634 \ 1635 product(bool, UseCMSBestFit, true, \ 1636 "Use CMS best fit allocation strategy") \ 1637 \ 1638 product(bool, UseParNewGC, false, \ 1639 "Use parallel threads in the new generation") \ 1640 \ 1641 product(bool, PrintTaskqueue, false, \ 1642 "Print taskqueue statistics for parallel collectors") \ 1643 \ 1644 product(bool, PrintTerminationStats, false, \ 1645 "Print termination statistics for parallel collectors") \ 1646 \ 1647 product(uintx, ParallelGCBufferWastePct, 10, \ 1648 "Wasted fraction of parallel allocation buffer") \ 1649 range(0, 100) \ 1650 \ 1651 product(uintx, TargetPLABWastePct, 10, \ 1652 "Target wasted space in last buffer as percent of overall " \ 1653 "allocation") \ 1654 range(1, 100) \ 1655 \ 1656 product(uintx, PLABWeight, 75, \ 1657 "Percentage (0-100) used to weight the current sample when " \ 1658 "computing exponentially decaying average for ResizePLAB") \ 1659 range(0, 100) \ 1660 \ 1661 product(bool, ResizePLAB, true, \ 1662 "Dynamically resize (survivor space) promotion LAB's") \ 1663 \ 1664 product(bool, PrintPLAB, false, \ 1665 "Print (survivor space) promotion LAB's sizing decisions") \ 1666 \ 1667 product(intx, ParGCArrayScanChunk, 50, \ 1668 "Scan a subset of object array and push remainder, if array is " \ 1669 "bigger than this") \ 1670 range(1, max_intx) \ 1671 \ 1672 product(bool, ParGCUseLocalOverflow, false, \ 1673 "Instead of a global overflow list, use local overflow stacks") \ 1674 \ 1675 product(bool, ParGCTrimOverflow, true, \ 1676 "Eagerly trim the local overflow lists " \ 1677 "(when ParGCUseLocalOverflow)") \ 1678 \ 1679 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1680 "Simulate work queue overflow in ParNew") \ 1681 \ 1682 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1683 "An `interval' counter that determines how frequently " \ 1684 "we simulate overflow; a smaller number increases frequency") \ 1685 \ 1686 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1687 "The desired number of objects to claim from the overflow list") \ 1688 \ 1689 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1690 "The number of strides per worker thread that we divide up the " \ 1691 "card table scanning work into") \ 1692 range(1, max_uintx) \ 1693 \ 1694 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1695 "The number of cards in each chunk of the parallel chunks used " \ 1696 "during card table scanning") \ 1697 range(1, max_intx) \ 1698 \ 1699 product(uintx, OldPLABWeight, 50, \ 1700 "Percentage (0-100) used to weight the current sample when " \ 1701 "computing exponentially decaying average for resizing " \ 1702 "OldPLABSize") \ 1703 range(0, 100) \ 1704 \ 1705 product(bool, ResizeOldPLAB, true, \ 1706 "Dynamically resize (old gen) promotion LAB's") \ 1707 \ 1708 product(bool, PrintOldPLAB, false, \ 1709 "Print (old gen) promotion LAB's sizing decisions") \ 1710 \ 1711 product(size_t, CMSOldPLABMax, 1024, \ 1712 "Maximum size of CMS gen promotion LAB caches per worker " \ 1713 "per block size") \ 1714 range(1, max_uintx) \ 1715 \ 1716 product(size_t, CMSOldPLABMin, 16, \ 1717 "Minimum size of CMS gen promotion LAB caches per worker " \ 1718 "per block size") \ 1719 range(1, max_uintx) \ 1720 constraint(CMSOldPLABMinConstraintFunc,AfterErgo) \ 1721 \ 1722 product(uintx, CMSOldPLABNumRefills, 4, \ 1723 "Nominal number of refills of CMS gen promotion LAB cache " \ 1724 "per worker per block size") \ 1725 range(1, max_uintx) \ 1726 \ 1727 product(bool, CMSOldPLABResizeQuicker, false, \ 1728 "React on-the-fly during a scavenge to a sudden " \ 1729 "change in block demand rate") \ 1730 \ 1731 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1732 "The tolerance of the phase-change detector for on-the-fly " \ 1733 "PLAB resizing during a scavenge") \ 1734 range(1, max_uintx) \ 1735 \ 1736 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1737 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1738 "during a scavenge") \ 1739 \ 1740 product(bool, AlwaysPreTouch, false, \ 1741 "Force all freshly committed pages to be pre-touched") \ 1742 \ 1743 product_pd(size_t, CMSYoungGenPerWorker, \ 1744 "The maximum size of young gen chosen by default per GC worker " \ 1745 "thread available") \ 1746 range(1, max_uintx) \ 1747 \ 1748 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1749 "Percentage (0-100) used to add conservatism when computing the " \ 1750 "duty cycle") \ 1751 range(0, 100) \ 1752 \ 1753 product(uintx, CMSExpAvgFactor, 50, \ 1754 "Percentage (0-100) used to weight the current sample when " \ 1755 "computing exponential averages for CMS statistics") \ 1756 range(0, 100) \ 1757 \ 1758 product(uintx, CMS_FLSWeight, 75, \ 1759 "Percentage (0-100) used to weight the current sample when " \ 1760 "computing exponentially decaying averages for CMS FLS " \ 1761 "statistics") \ 1762 range(0, 100) \ 1763 \ 1764 product(uintx, CMS_FLSPadding, 1, \ 1765 "The multiple of deviation from mean to use for buffering " \ 1766 "against volatility in free list demand") \ 1767 \ 1768 product(uintx, FLSCoalescePolicy, 2, \ 1769 "CMS: aggressiveness level for coalescing, increasing " \ 1770 "from 0 to 4") \ 1771 range(0, 4) \ 1772 \ 1773 product(bool, FLSAlwaysCoalesceLarge, false, \ 1774 "CMS: larger free blocks are always available for coalescing") \ 1775 \ 1776 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1777 "CMS: the smaller the percentage the greater the coalescing " \ 1778 "force") \ 1779 \ 1780 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1781 "CMS: the factor by which to inflate estimated demand of small " \ 1782 "block sizes to prevent coalescing with an adjoining block") \ 1783 \ 1784 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1785 "CMS: the factor by which to inflate estimated demand of large " \ 1786 "block sizes to prevent coalescing with an adjoining block") \ 1787 \ 1788 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1789 "CMS: the factor by which to inflate estimated demand of small " \ 1790 "block sizes to prevent splitting to supply demand for smaller " \ 1791 "blocks") \ 1792 \ 1793 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1794 "CMS: the factor by which to inflate estimated demand of large " \ 1795 "block sizes to prevent splitting to supply demand for smaller " \ 1796 "blocks") \ 1797 \ 1798 product(bool, CMSExtrapolateSweep, false, \ 1799 "CMS: cushion for block demand during sweep") \ 1800 \ 1801 product(uintx, CMS_SweepWeight, 75, \ 1802 "Percentage (0-100) used to weight the current sample when " \ 1803 "computing exponentially decaying average for inter-sweep " \ 1804 "duration") \ 1805 range(0, 100) \ 1806 \ 1807 product(uintx, CMS_SweepPadding, 1, \ 1808 "The multiple of deviation from mean to use for buffering " \ 1809 "against volatility in inter-sweep duration") \ 1810 \ 1811 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1812 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1813 "duration exceeds this threshold in milliseconds") \ 1814 \ 1815 product(bool, CMSClassUnloadingEnabled, true, \ 1816 "Whether class unloading enabled when using CMS GC") \ 1817 \ 1818 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1819 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1820 "count for which classes may not be unloaded") \ 1821 \ 1822 develop(intx, CMSDictionaryChoice, 0, \ 1823 "Use BinaryTreeDictionary as default in the CMS generation") \ 1824 \ 1825 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1826 "Replenish an indexed free list with this number of chunks") \ 1827 \ 1828 product(bool, CMSReplenishIntermediate, true, \ 1829 "Replenish all intermediate free-list caches") \ 1830 \ 1831 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1832 "When satisfying batched demand, split blocks from the " \ 1833 "IndexedFreeList whose size is a multiple of requested size") \ 1834 \ 1835 product(bool, CMSLoopWarn, false, \ 1836 "Warn in case of excessive CMS looping") \ 1837 \ 1838 develop(bool, CMSOverflowEarlyRestoration, false, \ 1839 "Restore preserved marks early") \ 1840 \ 1841 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1842 "Size of marking stack") \ 1843 \ 1844 /* where does the range max value of (max_jint - 1) come from? */ \ 1845 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1846 "Maximum size of marking stack") \ 1847 range(1, (max_jint - 1)) \ 1848 \ 1849 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1850 "Simulate frequent marking stack / work queue overflow") \ 1851 \ 1852 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1853 "An \"interval\" counter that determines how frequently " \ 1854 "to simulate overflow; a smaller number increases frequency") \ 1855 \ 1856 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1857 "Maximum number of abortable preclean iterations, if > 0") \ 1858 \ 1859 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1860 "Maximum time in abortable preclean (in milliseconds)") \ 1861 \ 1862 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1863 "Nominal minimum work per abortable preclean iteration") \ 1864 \ 1865 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1866 "Time that we sleep between iterations when not given " \ 1867 "enough work per iteration") \ 1868 \ 1869 product(size_t, CMSRescanMultiple, 32, \ 1870 "Size (in cards) of CMS parallel rescan task") \ 1871 range(1, max_uintx) \ 1872 \ 1873 product(size_t, CMSConcMarkMultiple, 32, \ 1874 "Size (in cards) of CMS concurrent MT marking task") \ 1875 range(1, max_uintx) \ 1876 \ 1877 product(bool, CMSAbortSemantics, false, \ 1878 "Whether abort-on-overflow semantics is implemented") \ 1879 \ 1880 product(bool, CMSParallelInitialMarkEnabled, true, \ 1881 "Use the parallel initial mark.") \ 1882 \ 1883 product(bool, CMSParallelRemarkEnabled, true, \ 1884 "Whether parallel remark enabled (only if ParNewGC)") \ 1885 \ 1886 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1887 "Whether parallel remark of survivor space " \ 1888 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1889 \ 1890 product(bool, CMSPLABRecordAlways, true, \ 1891 "Always record survivor space PLAB boundaries (effective only " \ 1892 "if CMSParallelSurvivorRemarkEnabled)") \ 1893 \ 1894 product(bool, CMSEdenChunksRecordAlways, true, \ 1895 "Always record eden chunks used for the parallel initial mark " \ 1896 "or remark of eden") \ 1897 \ 1898 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1899 "Print the eden and the survivor chunks used for the parallel " \ 1900 "initial mark or remark of the eden/survivor spaces") \ 1901 \ 1902 product(bool, CMSConcurrentMTEnabled, true, \ 1903 "Whether multi-threaded concurrent work enabled " \ 1904 "(effective only if ParNewGC)") \ 1905 \ 1906 product(bool, CMSPrecleaningEnabled, true, \ 1907 "Whether concurrent precleaning enabled") \ 1908 \ 1909 product(uintx, CMSPrecleanIter, 3, \ 1910 "Maximum number of precleaning iteration passes") \ 1911 range(0, 9) \ 1912 \ 1913 product(uintx, CMSPrecleanDenominator, 3, \ 1914 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1915 "ratio") \ 1916 range(1, max_uintx) \ 1917 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1918 \ 1919 product(uintx, CMSPrecleanNumerator, 2, \ 1920 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1921 "ratio") \ 1922 range(0, max_uintx-1) \ 1923 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1924 \ 1925 product(bool, CMSPrecleanRefLists1, true, \ 1926 "Preclean ref lists during (initial) preclean phase") \ 1927 \ 1928 product(bool, CMSPrecleanRefLists2, false, \ 1929 "Preclean ref lists during abortable preclean phase") \ 1930 \ 1931 product(bool, CMSPrecleanSurvivors1, false, \ 1932 "Preclean survivors during (initial) preclean phase") \ 1933 \ 1934 product(bool, CMSPrecleanSurvivors2, true, \ 1935 "Preclean survivors during abortable preclean phase") \ 1936 \ 1937 product(uintx, CMSPrecleanThreshold, 1000, \ 1938 "Do not iterate again if number of dirty cards is less than this")\ 1939 range(100, max_uintx) \ 1940 \ 1941 product(bool, CMSCleanOnEnter, true, \ 1942 "Clean-on-enter optimization for reducing number of dirty cards") \ 1943 \ 1944 product(uintx, CMSRemarkVerifyVariant, 1, \ 1945 "Choose variant (1,2) of verification following remark") \ 1946 range(1, 2) \ 1947 \ 1948 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1949 "If Eden size is below this, do not try to schedule remark") \ 1950 \ 1951 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1952 "The Eden occupancy percentage (0-100) at which " \ 1953 "to try and schedule remark pause") \ 1954 range(0, 100) \ 1955 \ 1956 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1957 "Start sampling eden top at least before young gen " \ 1958 "occupancy reaches 1/<ratio> of the size at which " \ 1959 "we plan to schedule remark") \ 1960 range(1, max_uintx) \ 1961 \ 1962 product(uintx, CMSSamplingGrain, 16*K, \ 1963 "The minimum distance between eden samples for CMS (see above)") \ 1964 range(1, max_uintx) \ 1965 \ 1966 product(bool, CMSScavengeBeforeRemark, false, \ 1967 "Attempt scavenge before the CMS remark step") \ 1968 \ 1969 develop(bool, CMSTraceSweeper, false, \ 1970 "Trace some actions of the CMS sweeper") \ 1971 \ 1972 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1973 "Don't drain below this size per parallel worker/thief") \ 1974 \ 1975 manageable(intx, CMSWaitDuration, 2000, \ 1976 "Time in milliseconds that CMS thread waits for young GC") \ 1977 \ 1978 develop(uintx, CMSCheckInterval, 1000, \ 1979 "Interval in milliseconds that CMS thread checks if it " \ 1980 "should start a collection cycle") \ 1981 \ 1982 product(bool, CMSYield, true, \ 1983 "Yield between steps of CMS") \ 1984 \ 1985 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1986 "Bitmap operations should process at most this many bits " \ 1987 "between yields") \ 1988 range(1, max_uintx) \ 1989 \ 1990 product(bool, CMSDumpAtPromotionFailure, false, \ 1991 "Dump useful information about the state of the CMS old " \ 1992 "generation upon a promotion failure") \ 1993 \ 1994 product(bool, CMSPrintChunksInDump, false, \ 1995 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1996 "more detailed information about the free chunks") \ 1997 \ 1998 product(bool, CMSPrintObjectsInDump, false, \ 1999 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 2000 "more detailed information about the allocated objects") \ 2001 \ 2002 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 2003 "Verify that all references across the FLS boundary " \ 2004 "are to valid objects") \ 2005 \ 2006 diagnostic(bool, FLSVerifyLists, false, \ 2007 "Do lots of (expensive) FreeListSpace verification") \ 2008 \ 2009 diagnostic(bool, FLSVerifyIndexTable, false, \ 2010 "Do lots of (expensive) FLS index table verification") \ 2011 \ 2012 develop(bool, FLSVerifyDictionary, false, \ 2013 "Do lots of (expensive) FLS dictionary verification") \ 2014 \ 2015 develop(bool, VerifyBlockOffsetArray, false, \ 2016 "Do (expensive) block offset array verification") \ 2017 \ 2018 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 2019 "Maintain _unallocated_block in BlockOffsetArray " \ 2020 "(currently applicable only to CMS collector)") \ 2021 \ 2022 develop(bool, TraceCMSState, false, \ 2023 "Trace the state of the CMS collection") \ 2024 \ 2025 product(intx, RefDiscoveryPolicy, 0, \ 2026 "Select type of reference discovery policy: " \ 2027 "reference-based(0) or referent-based(1)") \ 2028 range(ReferenceProcessor::DiscoveryPolicyMin, \ 2029 ReferenceProcessor::DiscoveryPolicyMax) \ 2030 \ 2031 product(bool, ParallelRefProcEnabled, false, \ 2032 "Enable parallel reference processing whenever possible") \ 2033 \ 2034 product(bool, ParallelRefProcBalancingEnabled, true, \ 2035 "Enable balancing of reference processing queues") \ 2036 \ 2037 product(uintx, CMSTriggerRatio, 80, \ 2038 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 2039 "allocated before a CMS collection cycle commences") \ 2040 range(0, 100) \ 2041 \ 2042 product(uintx, CMSBootstrapOccupancy, 50, \ 2043 "Percentage CMS generation occupancy at which to " \ 2044 "initiate CMS collection for bootstrapping collection stats") \ 2045 range(0, 100) \ 2046 \ 2047 product(intx, CMSInitiatingOccupancyFraction, -1, \ 2048 "Percentage CMS generation occupancy to start a CMS collection " \ 2049 "cycle. A negative value means that CMSTriggerRatio is used") \ 2050 range(min_intx, 100) \ 2051 \ 2052 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 2053 "Percentage of the (entire) heap occupancy to start a " \ 2054 "concurrent GC cycle. It is used by GCs that trigger a " \ 2055 "concurrent GC cycle based on the occupancy of the entire heap, " \ 2056 "not just one of the generations (e.g., G1). A value of 0 " \ 2057 "denotes 'do constant GC cycles'.") \ 2058 range(0, 100) \ 2059 \ 2060 manageable(intx, CMSTriggerInterval, -1, \ 2061 "Commence a CMS collection cycle (at least) every so many " \ 2062 "milliseconds (0 permanently, -1 disabled)") \ 2063 range(-1, max_intx) \ 2064 \ 2065 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 2066 "Only use occupancy as a criterion for starting a CMS collection")\ 2067 \ 2068 product(uintx, CMSIsTooFullPercentage, 98, \ 2069 "An absolute ceiling above which CMS will always consider the " \ 2070 "unloading of classes when class unloading is enabled") \ 2071 range(0, 100) \ 2072 \ 2073 develop(bool, CMSTestInFreeList, false, \ 2074 "Check if the coalesced range is already in the " \ 2075 "free lists as claimed") \ 2076 \ 2077 notproduct(bool, CMSVerifyReturnedBytes, false, \ 2078 "Check that all the garbage collected was returned to the " \ 2079 "free lists") \ 2080 \ 2081 notproduct(bool, ScavengeALot, false, \ 2082 "Force scavenge at every Nth exit from the runtime system " \ 2083 "(N=ScavengeALotInterval)") \ 2084 \ 2085 develop(bool, FullGCALot, false, \ 2086 "Force full gc at every Nth exit from the runtime system " \ 2087 "(N=FullGCALotInterval)") \ 2088 \ 2089 notproduct(bool, GCALotAtAllSafepoints, false, \ 2090 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 2091 \ 2092 product(bool, PrintPromotionFailure, false, \ 2093 "Print additional diagnostic information following " \ 2094 "promotion failure") \ 2095 \ 2096 notproduct(bool, PromotionFailureALot, false, \ 2097 "Use promotion failure handling on every young generation " \ 2098 "collection") \ 2099 \ 2100 develop(uintx, PromotionFailureALotCount, 1000, \ 2101 "Number of promotion failures occurring at PLAB " \ 2102 "refill attempts (ParNew) or promotion attempts " \ 2103 "(other young collectors)") \ 2104 \ 2105 develop(uintx, PromotionFailureALotInterval, 5, \ 2106 "Total collections between promotion failures a lot") \ 2107 \ 2108 experimental(uintx, WorkStealingSleepMillis, 1, \ 2109 "Sleep time when sleep is used for yields") \ 2110 \ 2111 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2112 "Number of yields before a sleep is done during work stealing") \ 2113 \ 2114 experimental(uintx, WorkStealingHardSpins, 4096, \ 2115 "Number of iterations in a spin loop between checks on " \ 2116 "time out of hard spin") \ 2117 \ 2118 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2119 "Ratio of hard spins to calls to yield") \ 2120 \ 2121 develop(uintx, ObjArrayMarkingStride, 512, \ 2122 "Number of object array elements to push onto the marking stack " \ 2123 "before pushing a continuation entry") \ 2124 \ 2125 develop(bool, MetadataAllocationFailALot, false, \ 2126 "Fail metadata allocations at intervals controlled by " \ 2127 "MetadataAllocationFailALotInterval") \ 2128 \ 2129 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2130 "Metadata allocation failure a lot interval") \ 2131 \ 2132 develop(bool, TraceMetadataChunkAllocation, false, \ 2133 "Trace chunk metadata allocations") \ 2134 \ 2135 product(bool, TraceMetadataHumongousAllocation, false, \ 2136 "Trace humongous metadata allocations") \ 2137 \ 2138 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2139 "Trace virtual space metadata allocations") \ 2140 \ 2141 notproduct(bool, ExecuteInternalVMTests, false, \ 2142 "Enable execution of internal VM tests") \ 2143 \ 2144 notproduct(bool, VerboseInternalVMTests, false, \ 2145 "Turn on logging for internal VM tests.") \ 2146 \ 2147 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2148 \ 2149 product_pd(bool, ResizeTLAB, \ 2150 "Dynamically resize TLAB size for threads") \ 2151 \ 2152 product(bool, ZeroTLAB, false, \ 2153 "Zero out the newly created TLAB") \ 2154 \ 2155 product(bool, FastTLABRefill, true, \ 2156 "Use fast TLAB refill code") \ 2157 \ 2158 product(bool, PrintTLAB, false, \ 2159 "Print various TLAB related information") \ 2160 \ 2161 product(bool, TLABStats, true, \ 2162 "Provide more detailed and expensive TLAB statistics " \ 2163 "(with PrintTLAB)") \ 2164 \ 2165 product_pd(bool, NeverActAsServerClassMachine, \ 2166 "Never act like a server-class machine") \ 2167 \ 2168 product(bool, AlwaysActAsServerClassMachine, false, \ 2169 "Always act like a server-class machine") \ 2170 \ 2171 product_pd(uint64_t, MaxRAM, \ 2172 "Real memory size (in bytes) used to set maximum heap size") \ 2173 \ 2174 product(size_t, ErgoHeapSizeLimit, 0, \ 2175 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2176 "MaxRAM / MaxRAMFraction") \ 2177 \ 2178 product(uintx, MaxRAMFraction, 4, \ 2179 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2180 "size") \ 2181 range(1, max_uintx) \ 2182 \ 2183 product(uintx, DefaultMaxRAMFraction, 4, \ 2184 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2185 "size; deprecated: to be renamed to MaxRAMFraction") \ 2186 range(1, max_uintx) \ 2187 \ 2188 product(uintx, MinRAMFraction, 2, \ 2189 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2190 "size on systems with small physical memory size") \ 2191 range(1, max_uintx) \ 2192 \ 2193 product(uintx, InitialRAMFraction, 64, \ 2194 "Fraction (1/n) of real memory used for initial heap size") \ 2195 range(1, max_uintx) \ 2196 \ 2197 develop(uintx, MaxVirtMemFraction, 2, \ 2198 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2199 "determining maximum heap size") \ 2200 \ 2201 product(bool, UseAutoGCSelectPolicy, false, \ 2202 "Use automatic collection selection policy") \ 2203 \ 2204 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2205 "Automatic GC selection pause threshold in milliseconds") \ 2206 \ 2207 product(bool, UseAdaptiveSizePolicy, true, \ 2208 "Use adaptive generation sizing policies") \ 2209 \ 2210 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2211 "Use adaptive survivor sizing policies") \ 2212 \ 2213 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2214 "Use adaptive young-old sizing policies at minor collections") \ 2215 \ 2216 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2217 "Use adaptive young-old sizing policies at major collections") \ 2218 \ 2219 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2220 "Include statistics from System.gc() for adaptive size policy") \ 2221 \ 2222 product(bool, UseAdaptiveGCBoundary, false, \ 2223 "Allow young-old boundary to move") \ 2224 \ 2225 develop(bool, TraceAdaptiveGCBoundary, false, \ 2226 "Trace young-old boundary moves") \ 2227 \ 2228 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2229 "Resize the virtual spaces of the young or old generations") \ 2230 \ 2231 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2232 "Policy for changing generation size for throughput goals") \ 2233 \ 2234 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2235 "Adjust tenured generation to achieve a minor pause goal") \ 2236 \ 2237 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2238 "Adjust young generation to achieve a major pause goal") \ 2239 \ 2240 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2241 "Number of steps where heuristics is used before data is used") \ 2242 \ 2243 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2244 "Number of collections before the adaptive sizing is started") \ 2245 \ 2246 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2247 "Collection interval for printing information; zero means never") \ 2248 \ 2249 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2250 "Use adaptive minimum footprint as a goal") \ 2251 \ 2252 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2253 "Weight given to exponential resizing, between 0 and 100") \ 2254 range(0, 100) \ 2255 \ 2256 product(uintx, AdaptiveTimeWeight, 25, \ 2257 "Weight given to time in adaptive policy, between 0 and 100") \ 2258 range(0, 100) \ 2259 \ 2260 product(uintx, PausePadding, 1, \ 2261 "How much buffer to keep for pause time") \ 2262 \ 2263 product(uintx, PromotedPadding, 3, \ 2264 "How much buffer to keep for promotion failure") \ 2265 \ 2266 product(uintx, SurvivorPadding, 3, \ 2267 "How much buffer to keep for survivor overflow") \ 2268 \ 2269 product(uintx, ThresholdTolerance, 10, \ 2270 "Allowed collection cost difference between generations") \ 2271 range(0, 100) \ 2272 \ 2273 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2274 "If collection costs are within margin, reduce both by full " \ 2275 "delta") \ 2276 \ 2277 product(uintx, YoungGenerationSizeIncrement, 20, \ 2278 "Adaptive size percentage change in young generation") \ 2279 range(0, 100) \ 2280 \ 2281 product(uintx, YoungGenerationSizeSupplement, 80, \ 2282 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2283 range(0, 100) \ 2284 \ 2285 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2286 "Decay factor to YoungedGenerationSizeSupplement") \ 2287 range(1, max_uintx) \ 2288 \ 2289 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2290 "Adaptive size percentage change in tenured generation") \ 2291 range(0, 100) \ 2292 \ 2293 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2294 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2295 range(0, 100) \ 2296 \ 2297 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2298 "Decay factor to TenuredGenerationSizeIncrement") \ 2299 range(1, max_uintx) \ 2300 \ 2301 product(uintx, MaxGCPauseMillis, max_uintx, \ 2302 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2303 "or (G1 Only) the maximum GC time per MMU time slice") \ 2304 \ 2305 product(uintx, GCPauseIntervalMillis, 0, \ 2306 "Time slice for MMU specification") \ 2307 \ 2308 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2309 "Adaptive size policy maximum GC minor pause time goal " \ 2310 "in millisecond") \ 2311 \ 2312 product(uintx, GCTimeRatio, 99, \ 2313 "Adaptive size policy application time to GC time ratio") \ 2314 \ 2315 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2316 "Adaptive size scale down factor for shrinking") \ 2317 range(1, max_uintx) \ 2318 \ 2319 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2320 "Adaptive size decays the major cost for long major intervals") \ 2321 \ 2322 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2323 "Time scale over which major costs decay") \ 2324 \ 2325 product(uintx, MinSurvivorRatio, 3, \ 2326 "Minimum ratio of young generation/survivor space size") \ 2327 \ 2328 product(uintx, InitialSurvivorRatio, 8, \ 2329 "Initial ratio of young generation/survivor space size") \ 2330 \ 2331 product(size_t, BaseFootPrintEstimate, 256*M, \ 2332 "Estimate of footprint other than Java Heap") \ 2333 \ 2334 product(bool, UseGCOverheadLimit, true, \ 2335 "Use policy to limit of proportion of time spent in GC " \ 2336 "before an OutOfMemory error is thrown") \ 2337 \ 2338 product(uintx, GCTimeLimit, 98, \ 2339 "Limit of the proportion of time spent in GC before " \ 2340 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2341 range(0, 100) \ 2342 \ 2343 product(uintx, GCHeapFreeLimit, 2, \ 2344 "Minimum percentage of free space after a full GC before an " \ 2345 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2346 range(0, 100) \ 2347 \ 2348 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2349 "Number of consecutive collections before gc time limit fires") \ 2350 \ 2351 product(bool, PrintAdaptiveSizePolicy, false, \ 2352 "Print information about AdaptiveSizePolicy") \ 2353 \ 2354 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2355 "How far ahead to prefetch destination area (<= 0 means off)") \ 2356 \ 2357 product(intx, PrefetchScanIntervalInBytes, -1, \ 2358 "How far ahead to prefetch scan area (<= 0 means off)") \ 2359 \ 2360 product(intx, PrefetchFieldsAhead, -1, \ 2361 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2362 \ 2363 diagnostic(bool, VerifySilently, false, \ 2364 "Do not print the verification progress") \ 2365 \ 2366 diagnostic(bool, VerifyDuringStartup, false, \ 2367 "Verify memory system before executing any Java code " \ 2368 "during VM initialization") \ 2369 \ 2370 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2371 "Verify system before exiting") \ 2372 \ 2373 diagnostic(bool, VerifyBeforeGC, false, \ 2374 "Verify memory system before GC") \ 2375 \ 2376 diagnostic(bool, VerifyAfterGC, false, \ 2377 "Verify memory system after GC") \ 2378 \ 2379 diagnostic(bool, VerifyDuringGC, false, \ 2380 "Verify memory system during GC (between phases)") \ 2381 \ 2382 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2383 "Enable parallel memory system verification") \ 2384 \ 2385 diagnostic(bool, DeferInitialCardMark, false, \ 2386 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2387 "may arise from new_pre_store_barrier") \ 2388 \ 2389 product(bool, UseCondCardMark, false, \ 2390 "Check for already marked card before updating card table") \ 2391 \ 2392 diagnostic(bool, VerifyRememberedSets, false, \ 2393 "Verify GC remembered sets") \ 2394 \ 2395 diagnostic(bool, VerifyObjectStartArray, true, \ 2396 "Verify GC object start array if verify before/after") \ 2397 \ 2398 product(bool, DisableExplicitGC, false, \ 2399 "Ignore calls to System.gc()") \ 2400 \ 2401 notproduct(bool, CheckMemoryInitialization, false, \ 2402 "Check memory initialization") \ 2403 \ 2404 diagnostic(bool, BindCMSThreadToCPU, false, \ 2405 "Bind CMS Thread to CPU if possible") \ 2406 \ 2407 diagnostic(uintx, CPUForCMSThread, 0, \ 2408 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2409 \ 2410 product(bool, BindGCTaskThreadsToCPUs, false, \ 2411 "Bind GCTaskThreads to CPUs if possible") \ 2412 \ 2413 product(bool, UseGCTaskAffinity, false, \ 2414 "Use worker affinity when asking for GCTasks") \ 2415 \ 2416 product(uintx, ProcessDistributionStride, 4, \ 2417 "Stride through processors when distributing processes") \ 2418 \ 2419 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2420 "Number of times the coordinator GC thread will sleep while " \ 2421 "yielding before giving up and resuming GC") \ 2422 \ 2423 product(uintx, CMSYieldSleepCount, 0, \ 2424 "Number of times a GC thread (minus the coordinator) " \ 2425 "will sleep while yielding before giving up and resuming GC") \ 2426 \ 2427 /* gc tracing */ \ 2428 manageable(bool, PrintGC, false, \ 2429 "Print message at garbage collection") \ 2430 \ 2431 manageable(bool, PrintGCDetails, false, \ 2432 "Print more details at garbage collection") \ 2433 \ 2434 manageable(bool, PrintGCDateStamps, false, \ 2435 "Print date stamps at garbage collection") \ 2436 \ 2437 manageable(bool, PrintGCTimeStamps, false, \ 2438 "Print timestamps at garbage collection") \ 2439 \ 2440 manageable(bool, PrintGCID, true, \ 2441 "Print an identifier for each garbage collection") \ 2442 \ 2443 product(bool, PrintGCTaskTimeStamps, false, \ 2444 "Print timestamps for individual gc worker thread tasks") \ 2445 \ 2446 develop(intx, ConcGCYieldTimeout, 0, \ 2447 "If non-zero, assert that GC threads yield within this " \ 2448 "number of milliseconds") \ 2449 \ 2450 product(bool, PrintReferenceGC, false, \ 2451 "Print times spent handling reference objects during GC " \ 2452 "(enabled only when PrintGCDetails)") \ 2453 \ 2454 develop(bool, TraceReferenceGC, false, \ 2455 "Trace handling of soft/weak/final/phantom references") \ 2456 \ 2457 develop(bool, TraceFinalizerRegistration, false, \ 2458 "Trace registration of final references") \ 2459 \ 2460 notproduct(bool, TraceScavenge, false, \ 2461 "Trace scavenge") \ 2462 \ 2463 product(bool, IgnoreEmptyClassPaths, false, \ 2464 "Ignore empty path elements in -classpath") \ 2465 \ 2466 product(bool, TraceClassPaths, false, \ 2467 "Trace processing of class paths") \ 2468 \ 2469 product_rw(bool, TraceClassLoading, false, \ 2470 "Trace all classes loaded") \ 2471 \ 2472 product(bool, TraceClassLoadingPreorder, false, \ 2473 "Trace all classes loaded in order referenced (not loaded)") \ 2474 \ 2475 product_rw(bool, TraceClassUnloading, false, \ 2476 "Trace unloading of classes") \ 2477 \ 2478 product_rw(bool, TraceLoaderConstraints, false, \ 2479 "Trace loader constraints") \ 2480 \ 2481 develop(bool, TraceClassLoaderData, false, \ 2482 "Trace class loader loader_data lifetime") \ 2483 \ 2484 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2485 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2486 "Initial size of the boot class loader data metaspace") \ 2487 \ 2488 product(bool, TraceYoungGenTime, false, \ 2489 "Trace accumulated time for young collection") \ 2490 \ 2491 product(bool, TraceOldGenTime, false, \ 2492 "Trace accumulated time for old collection") \ 2493 \ 2494 product(bool, PrintTenuringDistribution, false, \ 2495 "Print tenuring age information") \ 2496 \ 2497 product_rw(bool, PrintHeapAtGC, false, \ 2498 "Print heap layout before and after each GC") \ 2499 \ 2500 product_rw(bool, PrintHeapAtGCExtended, false, \ 2501 "Print extended information about the layout of the heap " \ 2502 "when -XX:+PrintHeapAtGC is set") \ 2503 \ 2504 product(bool, PrintHeapAtSIGBREAK, true, \ 2505 "Print heap layout in response to SIGBREAK") \ 2506 \ 2507 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2508 "Print a class histogram before any major stop-world GC") \ 2509 \ 2510 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2511 "Print a class histogram after any major stop-world GC") \ 2512 \ 2513 manageable(bool, PrintClassHistogram, false, \ 2514 "Print a histogram of class instances") \ 2515 \ 2516 develop(bool, TraceWorkGang, false, \ 2517 "Trace activities of work gangs") \ 2518 \ 2519 product(bool, TraceParallelOldGCTasks, false, \ 2520 "Trace multithreaded GC activity") \ 2521 \ 2522 develop(bool, TraceBlockOffsetTable, false, \ 2523 "Print BlockOffsetTable maps") \ 2524 \ 2525 develop(bool, TraceCardTableModRefBS, false, \ 2526 "Print CardTableModRefBS maps") \ 2527 \ 2528 develop(bool, TraceGCTaskManager, false, \ 2529 "Trace actions of the GC task manager") \ 2530 \ 2531 develop(bool, TraceGCTaskQueue, false, \ 2532 "Trace actions of the GC task queues") \ 2533 \ 2534 diagnostic(bool, TraceGCTaskThread, false, \ 2535 "Trace actions of the GC task threads") \ 2536 \ 2537 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2538 "Print the time taken by each phase in ParallelOldGC " \ 2539 "(PrintGCDetails must also be enabled)") \ 2540 \ 2541 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2542 "Trace marking phase in ParallelOldGC") \ 2543 \ 2544 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2545 "Trace summary phase in ParallelOldGC") \ 2546 \ 2547 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2548 "Trace compaction phase in ParallelOldGC") \ 2549 \ 2550 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2551 "Trace dense prefix computation for ParallelOldGC") \ 2552 \ 2553 develop(bool, IgnoreLibthreadGPFault, false, \ 2554 "Suppress workaround for libthread GP fault") \ 2555 \ 2556 product(bool, PrintJNIGCStalls, false, \ 2557 "Print diagnostic message when GC is stalled " \ 2558 "by JNI critical section") \ 2559 \ 2560 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2561 "The percentage of the used heap that the instances of a class " \ 2562 "must occupy for the class to generate a trace event") \ 2563 \ 2564 /* GC log rotation setting */ \ 2565 \ 2566 product(bool, UseGCLogFileRotation, false, \ 2567 "Rotate gclog files (for long running applications). It requires "\ 2568 "-Xloggc:<filename>") \ 2569 \ 2570 product(uintx, NumberOfGCLogFiles, 0, \ 2571 "Number of gclog files in rotation " \ 2572 "(default: 0, no rotation)") \ 2573 \ 2574 product(size_t, GCLogFileSize, 8*K, \ 2575 "GC log file size, requires UseGCLogFileRotation. " \ 2576 "Set to 0 to only trigger rotation via jcmd") \ 2577 \ 2578 /* JVMTI heap profiling */ \ 2579 \ 2580 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2581 "Trace JVMTI object tagging calls") \ 2582 \ 2583 diagnostic(bool, VerifyBeforeIteration, false, \ 2584 "Verify memory system before JVMTI iteration") \ 2585 \ 2586 /* compiler interface */ \ 2587 \ 2588 develop(bool, CIPrintCompilerName, false, \ 2589 "when CIPrint is active, print the name of the active compiler") \ 2590 \ 2591 diagnostic(bool, CIPrintCompileQueue, false, \ 2592 "display the contents of the compile queue whenever a " \ 2593 "compilation is enqueued") \ 2594 \ 2595 develop(bool, CIPrintRequests, false, \ 2596 "display every request for compilation") \ 2597 \ 2598 product(bool, CITime, false, \ 2599 "collect timing information for compilation") \ 2600 \ 2601 develop(bool, CITimeVerbose, false, \ 2602 "be more verbose in compilation timings") \ 2603 \ 2604 develop(bool, CITimeEach, false, \ 2605 "display timing information after each successful compilation") \ 2606 \ 2607 develop(bool, CICountOSR, false, \ 2608 "use a separate counter when assigning ids to osr compilations") \ 2609 \ 2610 develop(bool, CICompileNatives, true, \ 2611 "compile native methods if supported by the compiler") \ 2612 \ 2613 develop_pd(bool, CICompileOSR, \ 2614 "compile on stack replacement methods if supported by the " \ 2615 "compiler") \ 2616 \ 2617 develop(bool, CIPrintMethodCodes, false, \ 2618 "print method bytecodes of the compiled code") \ 2619 \ 2620 develop(bool, CIPrintTypeFlow, false, \ 2621 "print the results of ciTypeFlow analysis") \ 2622 \ 2623 develop(bool, CITraceTypeFlow, false, \ 2624 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2625 \ 2626 develop(intx, OSROnlyBCI, -1, \ 2627 "OSR only at this bci. Negative values mean exclude that bci") \ 2628 \ 2629 /* compiler */ \ 2630 \ 2631 /* notice: the max range value here is max_jint, not max_intx */ \ 2632 /* because of overflow issue */ \ 2633 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2634 "Number of compiler threads to run") \ 2635 range(0, max_jint) \ 2636 constraint(CICompilerCountConstraintFunc, AtParse) \ 2637 \ 2638 product(intx, CompilationPolicyChoice, 0, \ 2639 "which compilation policy (0-3)") \ 2640 range(0, 3) \ 2641 \ 2642 develop(bool, UseStackBanging, true, \ 2643 "use stack banging for stack overflow checks (required for " \ 2644 "proper StackOverflow handling; disable only to measure cost " \ 2645 "of stackbanging)") \ 2646 \ 2647 develop(bool, UseStrictFP, true, \ 2648 "use strict fp if modifier strictfp is set") \ 2649 \ 2650 develop(bool, GenerateSynchronizationCode, true, \ 2651 "generate locking/unlocking code for synchronized methods and " \ 2652 "monitors") \ 2653 \ 2654 develop(bool, GenerateCompilerNullChecks, true, \ 2655 "Generate explicit null checks for loads/stores/calls") \ 2656 \ 2657 develop(bool, GenerateRangeChecks, true, \ 2658 "Generate range checks for array accesses") \ 2659 \ 2660 develop_pd(bool, ImplicitNullChecks, \ 2661 "Generate code for implicit null checks") \ 2662 \ 2663 product_pd(bool, TrapBasedNullChecks, \ 2664 "Generate code for null checks that uses a cmp and trap " \ 2665 "instruction raising SIGTRAP. This is only used if an access to" \ 2666 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2667 "ImplicitNullChecks don't work (PPC64).") \ 2668 \ 2669 product(bool, PrintSafepointStatistics, false, \ 2670 "Print statistics about safepoint synchronization") \ 2671 \ 2672 product(intx, PrintSafepointStatisticsCount, 300, \ 2673 "Total number of safepoint statistics collected " \ 2674 "before printing them out") \ 2675 \ 2676 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2677 "Print safepoint statistics only when safepoint takes " \ 2678 "more than PrintSafepointSatisticsTimeout in millis") \ 2679 \ 2680 product(bool, TraceSafepointCleanupTime, false, \ 2681 "Print the break down of clean up tasks performed during " \ 2682 "safepoint") \ 2683 \ 2684 product(bool, Inline, true, \ 2685 "Enable inlining") \ 2686 \ 2687 product(bool, ClipInlining, true, \ 2688 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2689 \ 2690 develop(bool, UseCHA, true, \ 2691 "Enable CHA") \ 2692 \ 2693 product(bool, UseTypeProfile, true, \ 2694 "Check interpreter profile for historically monomorphic calls") \ 2695 \ 2696 diagnostic(bool, PrintInlining, false, \ 2697 "Print inlining optimizations") \ 2698 \ 2699 product(bool, UsePopCountInstruction, false, \ 2700 "Use population count instruction") \ 2701 \ 2702 develop(bool, EagerInitialization, false, \ 2703 "Eagerly initialize classes if possible") \ 2704 \ 2705 diagnostic(bool, LogTouchedMethods, false, \ 2706 "Log methods which have been ever touched in runtime") \ 2707 \ 2708 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2709 "Print all methods that have been ever touched in runtime") \ 2710 \ 2711 develop(bool, TraceMethodReplacement, false, \ 2712 "Print when methods are replaced do to recompilation") \ 2713 \ 2714 develop(bool, PrintMethodFlushing, false, \ 2715 "Print the nmethods being flushed") \ 2716 \ 2717 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2718 "print statistics about method flushing") \ 2719 \ 2720 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2721 "Number of compiled code invocations after which " \ 2722 "the method is considered as hot by the flusher") \ 2723 \ 2724 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2725 "Minimum number of sweeper passes before an nmethod " \ 2726 "can be flushed") \ 2727 \ 2728 product(bool, UseCodeAging, true, \ 2729 "Insert counter to detect warm methods") \ 2730 \ 2731 diagnostic(bool, StressCodeAging, false, \ 2732 "Start with counters compiled in") \ 2733 \ 2734 develop(bool, UseRelocIndex, false, \ 2735 "Use an index to speed random access to relocations") \ 2736 \ 2737 develop(bool, StressCodeBuffers, false, \ 2738 "Exercise code buffer expansion and other rare state changes") \ 2739 \ 2740 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2741 "Generate extra debugging information for non-safepoints in " \ 2742 "nmethods") \ 2743 \ 2744 product(bool, PrintVMOptions, false, \ 2745 "Print flags that appeared on the command line") \ 2746 \ 2747 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2748 "Ignore unrecognized VM options") \ 2749 \ 2750 product(bool, PrintCommandLineFlags, false, \ 2751 "Print flags specified on command line or set by ergonomics") \ 2752 \ 2753 product(bool, PrintFlagsInitial, false, \ 2754 "Print all VM flags before argument processing and exit VM") \ 2755 \ 2756 product(bool, PrintFlagsFinal, false, \ 2757 "Print all VM flags after argument and ergonomic processing") \ 2758 \ 2759 notproduct(bool, PrintFlagsWithComments, false, \ 2760 "Print all VM flags with default values and descriptions and " \ 2761 "exit") \ 2762 \ 2763 product(bool, PrintFlagsRanges, false, \ 2764 "Print VM flags and their ranges and exit VM") \ 2765 \ 2766 diagnostic(bool, SerializeVMOutput, true, \ 2767 "Use a mutex to serialize output to tty and LogFile") \ 2768 \ 2769 diagnostic(bool, DisplayVMOutput, true, \ 2770 "Display all VM output on the tty, independently of LogVMOutput") \ 2771 \ 2772 diagnostic(bool, LogVMOutput, false, \ 2773 "Save VM output to LogFile") \ 2774 \ 2775 diagnostic(ccstr, LogFile, NULL, \ 2776 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2777 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2778 \ 2779 product(ccstr, ErrorFile, NULL, \ 2780 "If an error occurs, save the error data to this file " \ 2781 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2782 \ 2783 product(bool, DisplayVMOutputToStderr, false, \ 2784 "If DisplayVMOutput is true, display all VM output to stderr") \ 2785 \ 2786 product(bool, DisplayVMOutputToStdout, false, \ 2787 "If DisplayVMOutput is true, display all VM output to stdout") \ 2788 \ 2789 product(bool, UseHeavyMonitors, false, \ 2790 "use heavyweight instead of lightweight Java monitors") \ 2791 \ 2792 product(bool, PrintStringTableStatistics, false, \ 2793 "print statistics about the StringTable and SymbolTable") \ 2794 \ 2795 diagnostic(bool, VerifyStringTableAtExit, false, \ 2796 "verify StringTable contents at exit") \ 2797 \ 2798 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2799 "print histogram of the symbol table") \ 2800 \ 2801 notproduct(bool, ExitVMOnVerifyError, false, \ 2802 "standard exit from VM if bytecode verify error " \ 2803 "(only in debug mode)") \ 2804 \ 2805 notproduct(ccstr, AbortVMOnException, NULL, \ 2806 "Call fatal if this exception is thrown. Example: " \ 2807 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2808 \ 2809 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2810 "Call fatal if the exception pointed by AbortVMOnException " \ 2811 "has this message") \ 2812 \ 2813 develop(bool, DebugVtables, false, \ 2814 "add debugging code to vtable dispatch") \ 2815 \ 2816 develop(bool, PrintVtables, false, \ 2817 "print vtables when printing klass") \ 2818 \ 2819 notproduct(bool, PrintVtableStats, false, \ 2820 "print vtables stats at end of run") \ 2821 \ 2822 develop(bool, TraceCreateZombies, false, \ 2823 "trace creation of zombie nmethods") \ 2824 \ 2825 notproduct(bool, IgnoreLockingAssertions, false, \ 2826 "disable locking assertions (for speed)") \ 2827 \ 2828 product(bool, RangeCheckElimination, true, \ 2829 "Eliminate range checks") \ 2830 \ 2831 develop_pd(bool, UncommonNullCast, \ 2832 "track occurrences of null in casts; adjust compiler tactics") \ 2833 \ 2834 develop(bool, TypeProfileCasts, true, \ 2835 "treat casts like calls for purposes of type profiling") \ 2836 \ 2837 develop(bool, DelayCompilationDuringStartup, true, \ 2838 "Delay invoking the compiler until main application class is " \ 2839 "loaded") \ 2840 \ 2841 develop(bool, CompileTheWorld, false, \ 2842 "Compile all methods in all classes in bootstrap class path " \ 2843 "(stress test)") \ 2844 \ 2845 develop(bool, CompileTheWorldPreloadClasses, true, \ 2846 "Preload all classes used by a class before start loading") \ 2847 \ 2848 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2849 "Force a safepoint every n compiles so sweeper can keep up") \ 2850 \ 2851 develop(bool, FillDelaySlots, true, \ 2852 "Fill delay slots (on SPARC only)") \ 2853 \ 2854 develop(bool, TimeLivenessAnalysis, false, \ 2855 "Time computation of bytecode liveness analysis") \ 2856 \ 2857 develop(bool, TraceLivenessGen, false, \ 2858 "Trace the generation of liveness analysis information") \ 2859 \ 2860 notproduct(bool, TraceLivenessQuery, false, \ 2861 "Trace queries of liveness analysis information") \ 2862 \ 2863 notproduct(bool, CollectIndexSetStatistics, false, \ 2864 "Collect information about IndexSets") \ 2865 \ 2866 develop(bool, UseLoopSafepoints, true, \ 2867 "Generate Safepoint nodes in every loop") \ 2868 \ 2869 develop(intx, FastAllocateSizeLimit, 128*K, \ 2870 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2871 "Inline allocations larger than this in doublewords must go slow")\ 2872 \ 2873 product(bool, AggressiveOpts, false, \ 2874 "Enable aggressive optimizations - see arguments.cpp") \ 2875 \ 2876 product_pd(uintx, TypeProfileLevel, \ 2877 "=XYZ, with Z: Type profiling of arguments at call; " \ 2878 "Y: Type profiling of return value at call; " \ 2879 "X: Type profiling of parameters to methods; " \ 2880 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2881 \ 2882 product(intx, TypeProfileArgsLimit, 2, \ 2883 "max number of call arguments to consider for type profiling") \ 2884 \ 2885 product(intx, TypeProfileParmsLimit, 2, \ 2886 "max number of incoming parameters to consider for type profiling"\ 2887 ", -1 for all") \ 2888 \ 2889 /* statistics */ \ 2890 develop(bool, CountCompiledCalls, false, \ 2891 "Count method invocations") \ 2892 \ 2893 notproduct(bool, CountRuntimeCalls, false, \ 2894 "Count VM runtime calls") \ 2895 \ 2896 develop(bool, CountJNICalls, false, \ 2897 "Count jni method invocations") \ 2898 \ 2899 notproduct(bool, CountJVMCalls, false, \ 2900 "Count jvm method invocations") \ 2901 \ 2902 notproduct(bool, CountRemovableExceptions, false, \ 2903 "Count exceptions that could be replaced by branches due to " \ 2904 "inlining") \ 2905 \ 2906 notproduct(bool, ICMissHistogram, false, \ 2907 "Produce histogram of IC misses") \ 2908 \ 2909 /* interpreter */ \ 2910 develop(bool, ClearInterpreterLocals, false, \ 2911 "Always clear local variables of interpreter activations upon " \ 2912 "entry") \ 2913 \ 2914 product_pd(bool, RewriteBytecodes, \ 2915 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2916 \ 2917 product_pd(bool, RewriteFrequentPairs, \ 2918 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2919 \ 2920 diagnostic(bool, PrintInterpreter, false, \ 2921 "Print the generated interpreter code") \ 2922 \ 2923 product(bool, UseInterpreter, true, \ 2924 "Use interpreter for non-compiled methods") \ 2925 \ 2926 develop(bool, UseFastSignatureHandlers, true, \ 2927 "Use fast signature handlers for native calls") \ 2928 \ 2929 product(bool, UseLoopCounter, true, \ 2930 "Increment invocation counter on backward branch") \ 2931 \ 2932 product_pd(bool, UseOnStackReplacement, \ 2933 "Use on stack replacement, calls runtime if invoc. counter " \ 2934 "overflows in loop") \ 2935 \ 2936 notproduct(bool, TraceOnStackReplacement, false, \ 2937 "Trace on stack replacement") \ 2938 \ 2939 product_pd(bool, PreferInterpreterNativeStubs, \ 2940 "Use always interpreter stubs for native methods invoked via " \ 2941 "interpreter") \ 2942 \ 2943 develop(bool, CountBytecodes, false, \ 2944 "Count number of bytecodes executed") \ 2945 \ 2946 develop(bool, PrintBytecodeHistogram, false, \ 2947 "Print histogram of the executed bytecodes") \ 2948 \ 2949 develop(bool, PrintBytecodePairHistogram, false, \ 2950 "Print histogram of the executed bytecode pairs") \ 2951 \ 2952 diagnostic(bool, PrintSignatureHandlers, false, \ 2953 "Print code generated for native method signature handlers") \ 2954 \ 2955 develop(bool, VerifyOops, false, \ 2956 "Do plausibility checks for oops") \ 2957 \ 2958 develop(bool, CheckUnhandledOops, false, \ 2959 "Check for unhandled oops in VM code") \ 2960 \ 2961 develop(bool, VerifyJNIFields, trueInDebug, \ 2962 "Verify jfieldIDs for instance fields") \ 2963 \ 2964 notproduct(bool, VerifyJNIEnvThread, false, \ 2965 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2966 "from JNI") \ 2967 \ 2968 develop(bool, VerifyFPU, false, \ 2969 "Verify FPU state (check for NaN's, etc.)") \ 2970 \ 2971 develop(bool, VerifyThread, false, \ 2972 "Watch the thread register for corruption (SPARC only)") \ 2973 \ 2974 develop(bool, VerifyActivationFrameSize, false, \ 2975 "Verify that activation frame didn't become smaller than its " \ 2976 "minimal size") \ 2977 \ 2978 develop(bool, TraceFrequencyInlining, false, \ 2979 "Trace frequency based inlining") \ 2980 \ 2981 develop_pd(bool, InlineIntrinsics, \ 2982 "Inline intrinsics that can be statically resolved") \ 2983 \ 2984 product_pd(bool, ProfileInterpreter, \ 2985 "Profile at the bytecode level during interpretation") \ 2986 \ 2987 develop(bool, TraceProfileInterpreter, false, \ 2988 "Trace profiling at the bytecode level during interpretation. " \ 2989 "This outputs the profiling information collected to improve " \ 2990 "jit compilation.") \ 2991 \ 2992 develop_pd(bool, ProfileTraps, \ 2993 "Profile deoptimization traps at the bytecode level") \ 2994 \ 2995 product(intx, ProfileMaturityPercentage, 20, \ 2996 "number of method invocations/branches (expressed as % of " \ 2997 "CompileThreshold) before using the method's profile") \ 2998 range(0, 100) \ 2999 \ 3000 diagnostic(bool, PrintMethodData, false, \ 3001 "Print the results of +ProfileInterpreter at end of run") \ 3002 \ 3003 develop(bool, VerifyDataPointer, trueInDebug, \ 3004 "Verify the method data pointer during interpreter profiling") \ 3005 \ 3006 develop(bool, VerifyCompiledCode, false, \ 3007 "Include miscellaneous runtime verifications in nmethod code; " \ 3008 "default off because it disturbs nmethod size heuristics") \ 3009 \ 3010 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 3011 "Manually make GC thread crash then dump java stack trace; " \ 3012 "Test only") \ 3013 \ 3014 /* compilation */ \ 3015 product(bool, UseCompiler, true, \ 3016 "Use Just-In-Time compilation") \ 3017 \ 3018 develop(bool, TraceCompilationPolicy, false, \ 3019 "Trace compilation policy") \ 3020 \ 3021 develop(bool, TimeCompilationPolicy, false, \ 3022 "Time the compilation policy") \ 3023 \ 3024 product(bool, UseCounterDecay, true, \ 3025 "Adjust recompilation counters") \ 3026 \ 3027 develop(intx, CounterHalfLifeTime, 30, \ 3028 "Half-life time of invocation counters (in seconds)") \ 3029 \ 3030 develop(intx, CounterDecayMinIntervalLength, 500, \ 3031 "The minimum interval (in milliseconds) between invocation of " \ 3032 "CounterDecay") \ 3033 \ 3034 product(bool, AlwaysCompileLoopMethods, false, \ 3035 "When using recompilation, never interpret methods " \ 3036 "containing loops") \ 3037 \ 3038 product(bool, DontCompileHugeMethods, true, \ 3039 "Do not compile methods > HugeMethodLimit") \ 3040 \ 3041 /* Bytecode escape analysis estimation. */ \ 3042 product(bool, EstimateArgEscape, true, \ 3043 "Analyze bytecodes to estimate escape state of arguments") \ 3044 \ 3045 product(intx, BCEATraceLevel, 0, \ 3046 "How much tracing to do of bytecode escape analysis estimates") \ 3047 \ 3048 product(intx, MaxBCEAEstimateLevel, 5, \ 3049 "Maximum number of nested calls that are analyzed by BC EA") \ 3050 \ 3051 product(intx, MaxBCEAEstimateSize, 150, \ 3052 "Maximum bytecode size of a method to be analyzed by BC EA") \ 3053 \ 3054 product(intx, AllocatePrefetchStyle, 1, \ 3055 "0 = no prefetch, " \ 3056 "1 = prefetch instructions for each allocation, " \ 3057 "2 = use TLAB watermark to gate allocation prefetch, " \ 3058 "3 = use BIS instruction on Sparc for allocation prefetch") \ 3059 range(0, 3) \ 3060 \ 3061 product(intx, AllocatePrefetchDistance, -1, \ 3062 "Distance to prefetch ahead of allocation pointer") \ 3063 \ 3064 product(intx, AllocatePrefetchLines, 3, \ 3065 "Number of lines to prefetch ahead of array allocation pointer") \ 3066 \ 3067 product(intx, AllocateInstancePrefetchLines, 1, \ 3068 "Number of lines to prefetch ahead of instance allocation " \ 3069 "pointer") \ 3070 \ 3071 product(intx, AllocatePrefetchStepSize, 16, \ 3072 "Step size in bytes of sequential prefetch instructions") \ 3073 \ 3074 product(intx, AllocatePrefetchInstr, 0, \ 3075 "Prefetch instruction to prefetch ahead of allocation pointer") \ 3076 \ 3077 /* deoptimization */ \ 3078 develop(bool, TraceDeoptimization, false, \ 3079 "Trace deoptimization") \ 3080 \ 3081 develop(bool, DebugDeoptimization, false, \ 3082 "Tracing various information while debugging deoptimization") \ 3083 \ 3084 product(intx, SelfDestructTimer, 0, \ 3085 "Will cause VM to terminate after a given time (in minutes) " \ 3086 "(0 means off)") \ 3087 \ 3088 product(intx, MaxJavaStackTraceDepth, 1024, \ 3089 "The maximum number of lines in the stack trace for Java " \ 3090 "exceptions (0 means all)") \ 3091 \ 3092 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3093 "Guarantee a safepoint (at least) every so many milliseconds " \ 3094 "(0 means none)")) \ 3095 \ 3096 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3097 "Guarantee a safepoint (at least) every so many milliseconds " \ 3098 "(0 means none)")) \ 3099 \ 3100 product(intx, SafepointTimeoutDelay, 10000, \ 3101 "Delay in milliseconds for option SafepointTimeout") \ 3102 \ 3103 product(intx, NmethodSweepActivity, 10, \ 3104 "Removes cold nmethods from code cache if > 0. Higher values " \ 3105 "result in more aggressive sweeping") \ 3106 range(0, 2000) \ 3107 \ 3108 notproduct(bool, LogSweeper, false, \ 3109 "Keep a ring buffer of sweeper activity") \ 3110 \ 3111 notproduct(intx, SweeperLogEntries, 1024, \ 3112 "Number of records in the ring buffer of sweeper activity") \ 3113 \ 3114 notproduct(intx, MemProfilingInterval, 500, \ 3115 "Time between each invocation of the MemProfiler") \ 3116 \ 3117 develop(intx, MallocCatchPtr, -1, \ 3118 "Hit breakpoint when mallocing/freeing this pointer") \ 3119 \ 3120 notproduct(ccstrlist, SuppressErrorAt, "", \ 3121 "List of assertions (file:line) to muzzle") \ 3122 \ 3123 notproduct(size_t, HandleAllocationLimit, 1024, \ 3124 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3125 "is used") \ 3126 \ 3127 develop(size_t, TotalHandleAllocationLimit, 1024, \ 3128 "Threshold for total handle allocation when " \ 3129 "+TraceHandleAllocation is used") \ 3130 \ 3131 develop(intx, StackPrintLimit, 100, \ 3132 "number of stack frames to print in VM-level stack dump") \ 3133 \ 3134 notproduct(intx, MaxElementPrintSize, 256, \ 3135 "maximum number of elements to print") \ 3136 \ 3137 notproduct(intx, MaxSubklassPrintSize, 4, \ 3138 "maximum number of subklasses to print when printing klass") \ 3139 \ 3140 product(intx, MaxInlineLevel, 9, \ 3141 "maximum number of nested calls that are inlined") \ 3142 \ 3143 product(intx, MaxRecursiveInlineLevel, 1, \ 3144 "maximum number of nested recursive calls that are inlined") \ 3145 \ 3146 develop(intx, MaxForceInlineLevel, 100, \ 3147 "maximum number of nested calls that are forced for inlining " \ 3148 "(using CompilerOracle or marked w/ @ForceInline)") \ 3149 \ 3150 product_pd(intx, InlineSmallCode, \ 3151 "Only inline already compiled methods if their code size is " \ 3152 "less than this") \ 3153 \ 3154 product(intx, MaxInlineSize, 35, \ 3155 "The maximum bytecode size of a method to be inlined") \ 3156 \ 3157 product_pd(intx, FreqInlineSize, \ 3158 "The maximum bytecode size of a frequent method to be inlined") \ 3159 \ 3160 product(intx, MaxTrivialSize, 6, \ 3161 "The maximum bytecode size of a trivial method to be inlined") \ 3162 \ 3163 product(intx, MinInliningThreshold, 250, \ 3164 "The minimum invocation count a method needs to have to be " \ 3165 "inlined") \ 3166 \ 3167 develop(intx, MethodHistogramCutoff, 100, \ 3168 "The cutoff value for method invocation histogram (+CountCalls)") \ 3169 \ 3170 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3171 "Number of interpreted methods to show in profile") \ 3172 \ 3173 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3174 "Number of compiled methods to show in profile") \ 3175 \ 3176 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3177 "Number of stub methods to show in profile") \ 3178 \ 3179 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3180 "Number of runtime stub nodes to show in profile") \ 3181 \ 3182 product(intx, ProfileIntervalsTicks, 100, \ 3183 "Number of ticks between printing of interval profile " \ 3184 "(+ProfileIntervals)") \ 3185 \ 3186 notproduct(intx, ScavengeALotInterval, 1, \ 3187 "Interval between which scavenge will occur with +ScavengeALot") \ 3188 \ 3189 notproduct(intx, FullGCALotInterval, 1, \ 3190 "Interval between which full gc will occur with +FullGCALot") \ 3191 \ 3192 notproduct(intx, FullGCALotStart, 0, \ 3193 "For which invocation to start FullGCAlot") \ 3194 \ 3195 notproduct(intx, FullGCALotDummies, 32*K, \ 3196 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3197 "to move") \ 3198 \ 3199 develop(intx, DontYieldALotInterval, 10, \ 3200 "Interval between which yields will be dropped (milliseconds)") \ 3201 \ 3202 develop(intx, MinSleepInterval, 1, \ 3203 "Minimum sleep() interval (milliseconds) when " \ 3204 "ConvertSleepToYield is off (used for Solaris)") \ 3205 \ 3206 develop(intx, ProfilerPCTickThreshold, 15, \ 3207 "Number of ticks in a PC buckets to be a hotspot") \ 3208 \ 3209 notproduct(intx, DeoptimizeALotInterval, 5, \ 3210 "Number of exits until DeoptimizeALot kicks in") \ 3211 \ 3212 notproduct(intx, ZombieALotInterval, 5, \ 3213 "Number of exits until ZombieALot kicks in") \ 3214 \ 3215 diagnostic(intx, MallocVerifyInterval, 0, \ 3216 "If non-zero, verify C heap after every N calls to " \ 3217 "malloc/realloc/free") \ 3218 \ 3219 diagnostic(intx, MallocVerifyStart, 0, \ 3220 "If non-zero, start verifying C heap after Nth call to " \ 3221 "malloc/realloc/free") \ 3222 \ 3223 diagnostic(uintx, MallocMaxTestWords, 0, \ 3224 "If non-zero, maximum number of words that malloc/realloc can " \ 3225 "allocate (for testing only)") \ 3226 \ 3227 product(intx, TypeProfileWidth, 2, \ 3228 "Number of receiver types to record in call/cast profile") \ 3229 \ 3230 develop(intx, BciProfileWidth, 2, \ 3231 "Number of return bci's to record in ret profile") \ 3232 \ 3233 product(intx, PerMethodRecompilationCutoff, 400, \ 3234 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3235 range(-1, max_intx) \ 3236 \ 3237 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3238 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3239 range(-1, max_intx) \ 3240 \ 3241 product(intx, PerMethodTrapLimit, 100, \ 3242 "Limit on traps (of one kind) in a method (includes inlines)") \ 3243 \ 3244 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3245 "Limit on speculative traps (of one kind) in a method " \ 3246 "(includes inlines)") \ 3247 \ 3248 product(intx, PerBytecodeTrapLimit, 4, \ 3249 "Limit on traps (of one kind) at a particular BCI") \ 3250 \ 3251 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3252 "Extra method data trap entries for speculation") \ 3253 \ 3254 develop(intx, InlineFrequencyRatio, 20, \ 3255 "Ratio of call site execution to caller method invocation") \ 3256 \ 3257 develop_pd(intx, InlineFrequencyCount, \ 3258 "Count of call site execution necessary to trigger frequent " \ 3259 "inlining") \ 3260 \ 3261 develop(intx, InlineThrowCount, 50, \ 3262 "Force inlining of interpreted methods that throw this often") \ 3263 \ 3264 develop(intx, InlineThrowMaxSize, 200, \ 3265 "Force inlining of throwing methods smaller than this") \ 3266 \ 3267 develop(intx, ProfilerNodeSize, 1024, \ 3268 "Size in K to allocate for the Profile Nodes of each thread") \ 3269 \ 3270 /* gc parameters */ \ 3271 product(size_t, InitialHeapSize, 0, \ 3272 "Initial heap size (in bytes); zero means use ergonomics") \ 3273 \ 3274 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3275 "Maximum heap size (in bytes)") \ 3276 \ 3277 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3278 "Initial tenured generation size (in bytes)") \ 3279 \ 3280 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3281 "Initial new generation size (in bytes)") \ 3282 \ 3283 product(size_t, MaxNewSize, max_uintx, \ 3284 "Maximum new generation size (in bytes), max_uintx means set " \ 3285 "ergonomically") \ 3286 \ 3287 product(size_t, PretenureSizeThreshold, 0, \ 3288 "Maximum size in bytes of objects allocated in DefNew " \ 3289 "generation; zero means no maximum") \ 3290 \ 3291 product(size_t, TLABSize, 0, \ 3292 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3293 \ 3294 product(size_t, MinTLABSize, 2*K, \ 3295 "Minimum allowed TLAB size (in bytes)") \ 3296 range(1, max_uintx) \ 3297 \ 3298 product(uintx, TLABAllocationWeight, 35, \ 3299 "Allocation averaging weight") \ 3300 range(0, 100) \ 3301 \ 3302 /* Limit the lower bound of this flag to 1 as it is used */ \ 3303 /* in a division expression. */ \ 3304 product(uintx, TLABWasteTargetPercent, 1, \ 3305 "Percentage of Eden that can be wasted") \ 3306 range(1, 100) \ 3307 \ 3308 product(uintx, TLABRefillWasteFraction, 64, \ 3309 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3310 range(1, max_uintx) \ 3311 \ 3312 product(uintx, TLABWasteIncrement, 4, \ 3313 "Increment allowed waste at slow allocation") \ 3314 \ 3315 product(uintx, SurvivorRatio, 8, \ 3316 "Ratio of eden/survivor space size") \ 3317 \ 3318 product(uintx, NewRatio, 2, \ 3319 "Ratio of old/new generation sizes") \ 3320 \ 3321 product_pd(size_t, NewSizeThreadIncrease, \ 3322 "Additional size added to desired new generation size per " \ 3323 "non-daemon thread (in bytes)") \ 3324 \ 3325 product_pd(size_t, MetaspaceSize, \ 3326 "Initial size of Metaspaces (in bytes)") \ 3327 \ 3328 product(size_t, MaxMetaspaceSize, max_uintx, \ 3329 "Maximum size of Metaspaces (in bytes)") \ 3330 \ 3331 product(size_t, CompressedClassSpaceSize, 1*G, \ 3332 "Maximum size of class area in Metaspace when compressed " \ 3333 "class pointers are used") \ 3334 range(1*M, 3*G) \ 3335 \ 3336 manageable(uintx, MinHeapFreeRatio, 40, \ 3337 "The minimum percentage of heap free after GC to avoid expansion."\ 3338 " For most GCs this applies to the old generation. In G1 and" \ 3339 " ParallelGC it applies to the whole heap.") \ 3340 range(0, 100) \ 3341 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3342 \ 3343 manageable(uintx, MaxHeapFreeRatio, 70, \ 3344 "The maximum percentage of heap free after GC to avoid shrinking."\ 3345 " For most GCs this applies to the old generation. In G1 and" \ 3346 " ParallelGC it applies to the whole heap.") \ 3347 range(0, 100) \ 3348 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3349 \ 3350 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3351 "Number of milliseconds per MB of free space in the heap") \ 3352 \ 3353 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3354 "The minimum change in heap space due to GC (in bytes)") \ 3355 \ 3356 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3357 "The minimum expansion of Metaspace (in bytes)") \ 3358 \ 3359 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3360 "The maximum percentage of Metaspace free after GC to avoid " \ 3361 "shrinking") \ 3362 range(0, 100) \ 3363 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3364 \ 3365 product(uintx, MinMetaspaceFreeRatio, 40, \ 3366 "The minimum percentage of Metaspace free after GC to avoid " \ 3367 "expansion") \ 3368 range(0, 99) \ 3369 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3370 \ 3371 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3372 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3373 \ 3374 product(uintx, QueuedAllocationWarningCount, 0, \ 3375 "Number of times an allocation that queues behind a GC " \ 3376 "will retry before printing a warning") \ 3377 \ 3378 diagnostic(uintx, VerifyGCStartAt, 0, \ 3379 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3380 \ 3381 diagnostic(intx, VerifyGCLevel, 0, \ 3382 "Generation level at which to start +VerifyBefore/AfterGC") \ 3383 \ 3384 product(uintx, MaxTenuringThreshold, 15, \ 3385 "Maximum value for tenuring threshold") \ 3386 range(0, markOopDesc::max_age + 1) \ 3387 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3388 \ 3389 product(uintx, InitialTenuringThreshold, 7, \ 3390 "Initial value for tenuring threshold") \ 3391 range(0, markOopDesc::max_age + 1) \ 3392 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3393 \ 3394 product(uintx, TargetSurvivorRatio, 50, \ 3395 "Desired percentage of survivor space used after scavenge") \ 3396 range(0, 100) \ 3397 \ 3398 product(uintx, MarkSweepDeadRatio, 5, \ 3399 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3400 "Serial mark sweep treats this as both the minimum and maximum " \ 3401 "value. " \ 3402 "CMS uses this value only if it falls back to mark sweep. " \ 3403 "Par compact uses a variable scale based on the density of the " \ 3404 "generation and treats this as the maximum value when the heap " \ 3405 "is either completely full or completely empty. Par compact " \ 3406 "also has a smaller default value; see arguments.cpp.") \ 3407 range(0, 100) \ 3408 \ 3409 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3410 "How often should we fully compact the heap (ignoring the dead " \ 3411 "space parameters)") \ 3412 range(1, max_uintx) \ 3413 \ 3414 product(intx, PrintCMSStatistics, 0, \ 3415 "Statistics for CMS") \ 3416 \ 3417 product(bool, PrintCMSInitiationStatistics, false, \ 3418 "Statistics for initiating a CMS collection") \ 3419 \ 3420 product(intx, PrintFLSStatistics, 0, \ 3421 "Statistics for CMS' FreeListSpace") \ 3422 \ 3423 product(intx, PrintFLSCensus, 0, \ 3424 "Census for CMS' FreeListSpace") \ 3425 \ 3426 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3427 "Delay between expansion and allocation (in milliseconds)") \ 3428 \ 3429 develop(uintx, GCWorkerDelayMillis, 0, \ 3430 "Delay in scheduling GC workers (in milliseconds)") \ 3431 \ 3432 product(intx, DeferThrSuspendLoopCount, 4000, \ 3433 "(Unstable) Number of times to iterate in safepoint loop " \ 3434 "before blocking VM threads ") \ 3435 \ 3436 product(intx, DeferPollingPageLoopCount, -1, \ 3437 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3438 "before changing safepoint polling page to RO ") \ 3439 \ 3440 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3441 \ 3442 product(bool, PSChunkLargeArrays, true, \ 3443 "Process large arrays in chunks") \ 3444 \ 3445 product(uintx, GCDrainStackTargetSize, 64, \ 3446 "Number of entries we will try to leave on the stack " \ 3447 "during parallel gc") \ 3448 \ 3449 /* stack parameters */ \ 3450 product_pd(intx, StackYellowPages, \ 3451 "Number of yellow zone (recoverable overflows) pages") \ 3452 range(1, max_intx) \ 3453 \ 3454 product_pd(intx, StackRedPages, \ 3455 "Number of red zone (unrecoverable overflows) pages") \ 3456 range(1, max_intx) \ 3457 \ 3458 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3459 product_pd(intx, StackShadowPages, \ 3460 "Number of shadow zone (for overflow checking) pages " \ 3461 "this should exceed the depth of the VM and native call stack") \ 3462 range(1, 50) \ 3463 \ 3464 product_pd(intx, ThreadStackSize, \ 3465 "Thread Stack Size (in Kbytes)") \ 3466 \ 3467 product_pd(intx, VMThreadStackSize, \ 3468 "Non-Java Thread Stack Size (in Kbytes)") \ 3469 \ 3470 product_pd(intx, CompilerThreadStackSize, \ 3471 "Compiler Thread Stack Size (in Kbytes)") \ 3472 \ 3473 develop_pd(size_t, JVMInvokeMethodSlack, \ 3474 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3475 \ 3476 /* code cache parameters */ \ 3477 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3478 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3479 "Code cache segment size (in bytes) - smallest unit of " \ 3480 "allocation") \ 3481 range(1, 1024) \ 3482 \ 3483 develop_pd(intx, CodeEntryAlignment, \ 3484 "Code entry alignment for generated code (in bytes)") \ 3485 \ 3486 product_pd(intx, OptoLoopAlignment, \ 3487 "Align inner loops to zero relative to this modulus") \ 3488 \ 3489 product_pd(uintx, InitialCodeCacheSize, \ 3490 "Initial code cache size (in bytes)") \ 3491 \ 3492 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3493 "Minimum code cache size (in bytes) required to start VM.") \ 3494 \ 3495 product(bool, SegmentedCodeCache, false, \ 3496 "Use a segmented code cache") \ 3497 \ 3498 product_pd(uintx, ReservedCodeCacheSize, \ 3499 "Reserved code cache size (in bytes) - maximum code cache size") \ 3500 \ 3501 product_pd(uintx, NonProfiledCodeHeapSize, \ 3502 "Size of code heap with non-profiled methods (in bytes)") \ 3503 \ 3504 product_pd(uintx, ProfiledCodeHeapSize, \ 3505 "Size of code heap with profiled methods (in bytes)") \ 3506 \ 3507 product_pd(uintx, NonNMethodCodeHeapSize, \ 3508 "Size of code heap with non-nmethods (in bytes)") \ 3509 \ 3510 product_pd(uintx, CodeCacheExpansionSize, \ 3511 "Code cache expansion size (in bytes)") \ 3512 \ 3513 develop_pd(uintx, CodeCacheMinBlockLength, \ 3514 "Minimum number of segments in a code cache block") \ 3515 range(1, 100) \ 3516 \ 3517 notproduct(bool, ExitOnFullCodeCache, false, \ 3518 "Exit the VM if we fill the code cache") \ 3519 \ 3520 product(bool, UseCodeCacheFlushing, true, \ 3521 "Remove cold/old nmethods from the code cache") \ 3522 \ 3523 product(uintx, StartAggressiveSweepingAt, 10, \ 3524 "Start aggressive sweeping if X[%] of the code cache is free." \ 3525 "Segmented code cache: X[%] of the non-profiled heap." \ 3526 "Non-segmented code cache: X[%] of the total code cache") \ 3527 range(0, 100) \ 3528 \ 3529 /* interpreter debugging */ \ 3530 develop(intx, BinarySwitchThreshold, 5, \ 3531 "Minimal number of lookupswitch entries for rewriting to binary " \ 3532 "switch") \ 3533 \ 3534 develop(intx, StopInterpreterAt, 0, \ 3535 "Stop interpreter execution at specified bytecode number") \ 3536 \ 3537 develop(intx, TraceBytecodesAt, 0, \ 3538 "Trace bytecodes starting with specified bytecode number") \ 3539 \ 3540 /* compiler interface */ \ 3541 develop(intx, CIStart, 0, \ 3542 "The id of the first compilation to permit") \ 3543 \ 3544 develop(intx, CIStop, max_jint, \ 3545 "The id of the last compilation to permit") \ 3546 \ 3547 develop(intx, CIStartOSR, 0, \ 3548 "The id of the first osr compilation to permit " \ 3549 "(CICountOSR must be on)") \ 3550 \ 3551 develop(intx, CIStopOSR, max_jint, \ 3552 "The id of the last osr compilation to permit " \ 3553 "(CICountOSR must be on)") \ 3554 \ 3555 develop(intx, CIBreakAtOSR, -1, \ 3556 "The id of osr compilation to break at") \ 3557 \ 3558 develop(intx, CIBreakAt, -1, \ 3559 "The id of compilation to break at") \ 3560 \ 3561 product(ccstrlist, CompileOnly, "", \ 3562 "List of methods (pkg/class.name) to restrict compilation to") \ 3563 \ 3564 product(ccstr, CompileCommandFile, NULL, \ 3565 "Read compiler commands from this file [.hotspot_compiler]") \ 3566 \ 3567 product(ccstrlist, CompileCommand, "", \ 3568 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3569 \ 3570 develop(bool, ReplayCompiles, false, \ 3571 "Enable replay of compilations from ReplayDataFile") \ 3572 \ 3573 product(ccstr, ReplayDataFile, NULL, \ 3574 "File containing compilation replay information" \ 3575 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3576 \ 3577 product(ccstr, InlineDataFile, NULL, \ 3578 "File containing inlining replay information" \ 3579 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3580 \ 3581 develop(intx, ReplaySuppressInitializers, 2, \ 3582 "Control handling of class initialization during replay: " \ 3583 "0 - don't do anything special; " \ 3584 "1 - treat all class initializers as empty; " \ 3585 "2 - treat class initializers for application classes as empty; " \ 3586 "3 - allow all class initializers to run during bootstrap but " \ 3587 " pretend they are empty after starting replay") \ 3588 range(0, 3) \ 3589 \ 3590 develop(bool, ReplayIgnoreInitErrors, false, \ 3591 "Ignore exceptions thrown during initialization for replay") \ 3592 \ 3593 product(bool, DumpReplayDataOnError, true, \ 3594 "Record replay data for crashing compiler threads") \ 3595 \ 3596 product(bool, CICompilerCountPerCPU, false, \ 3597 "1 compiler thread for log(N CPUs)") \ 3598 \ 3599 develop(intx, CIFireOOMAt, -1, \ 3600 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3601 "(non-negative value throws OOM after this many CI accesses " \ 3602 "in each compile)") \ 3603 notproduct(intx, CICrashAt, -1, \ 3604 "id of compilation to trigger assert in compiler thread for " \ 3605 "the purpose of testing, e.g. generation of replay data") \ 3606 notproduct(bool, CIObjectFactoryVerify, false, \ 3607 "enable potentially expensive verification in ciObjectFactory") \ 3608 \ 3609 /* Priorities */ \ 3610 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3611 \ 3612 product(intx, ThreadPriorityPolicy, 0, \ 3613 "0 : Normal. "\ 3614 " VM chooses priorities that are appropriate for normal "\ 3615 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3616 " to normal native priority. Java priorities below " \ 3617 " NORM_PRIORITY map to lower native priority values. On "\ 3618 " Windows applications are allowed to use higher native "\ 3619 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3620 " not use the highest possible native priority, "\ 3621 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3622 " system threads. On Linux thread priorities are ignored "\ 3623 " because the OS does not support static priority in "\ 3624 " SCHED_OTHER scheduling class which is the only choice for "\ 3625 " non-root, non-realtime applications. "\ 3626 "1 : Aggressive. "\ 3627 " Java thread priorities map over to the entire range of "\ 3628 " native thread priorities. Higher Java thread priorities map "\ 3629 " to higher native thread priorities. This policy should be "\ 3630 " used with care, as sometimes it can cause performance "\ 3631 " degradation in the application and/or the entire system. On "\ 3632 " Linux this policy requires root privilege.") \ 3633 range(0, 1) \ 3634 \ 3635 product(bool, ThreadPriorityVerbose, false, \ 3636 "Print priority changes") \ 3637 \ 3638 product(intx, CompilerThreadPriority, -1, \ 3639 "The native priority at which compiler threads should run " \ 3640 "(-1 means no change)") \ 3641 \ 3642 product(intx, VMThreadPriority, -1, \ 3643 "The native priority at which the VM thread should run " \ 3644 "(-1 means no change)") \ 3645 \ 3646 product(bool, CompilerThreadHintNoPreempt, true, \ 3647 "(Solaris only) Give compiler threads an extra quanta") \ 3648 \ 3649 product(bool, VMThreadHintNoPreempt, false, \ 3650 "(Solaris only) Give VM thread an extra quanta") \ 3651 \ 3652 product(intx, JavaPriority1_To_OSPriority, -1, \ 3653 "Map Java priorities to OS priorities") \ 3654 \ 3655 product(intx, JavaPriority2_To_OSPriority, -1, \ 3656 "Map Java priorities to OS priorities") \ 3657 \ 3658 product(intx, JavaPriority3_To_OSPriority, -1, \ 3659 "Map Java priorities to OS priorities") \ 3660 \ 3661 product(intx, JavaPriority4_To_OSPriority, -1, \ 3662 "Map Java priorities to OS priorities") \ 3663 \ 3664 product(intx, JavaPriority5_To_OSPriority, -1, \ 3665 "Map Java priorities to OS priorities") \ 3666 \ 3667 product(intx, JavaPriority6_To_OSPriority, -1, \ 3668 "Map Java priorities to OS priorities") \ 3669 \ 3670 product(intx, JavaPriority7_To_OSPriority, -1, \ 3671 "Map Java priorities to OS priorities") \ 3672 \ 3673 product(intx, JavaPriority8_To_OSPriority, -1, \ 3674 "Map Java priorities to OS priorities") \ 3675 \ 3676 product(intx, JavaPriority9_To_OSPriority, -1, \ 3677 "Map Java priorities to OS priorities") \ 3678 \ 3679 product(intx, JavaPriority10_To_OSPriority,-1, \ 3680 "Map Java priorities to OS priorities") \ 3681 \ 3682 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3683 "Java thread priority 10 maps to critical scheduling priority") \ 3684 \ 3685 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3686 "Compiler thread(s) run at critical scheduling priority") \ 3687 \ 3688 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3689 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3690 \ 3691 /* compiler debugging */ \ 3692 notproduct(intx, CompileTheWorldStartAt, 1, \ 3693 "First class to consider when using +CompileTheWorld") \ 3694 \ 3695 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3696 "Last class to consider when using +CompileTheWorld") \ 3697 \ 3698 develop(intx, NewCodeParameter, 0, \ 3699 "Testing Only: Create a dedicated integer parameter before " \ 3700 "putback") \ 3701 \ 3702 /* new oopmap storage allocation */ \ 3703 develop(intx, MinOopMapAllocation, 8, \ 3704 "Minimum number of OopMap entries in an OopMapSet") \ 3705 \ 3706 /* Background Compilation */ \ 3707 develop(intx, LongCompileThreshold, 50, \ 3708 "Used with +TraceLongCompiles") \ 3709 \ 3710 /* recompilation */ \ 3711 product_pd(intx, CompileThreshold, \ 3712 "number of interpreted method invocations before (re-)compiling") \ 3713 \ 3714 product(double, CompileThresholdScaling, 1.0, \ 3715 "Factor to control when first compilation happens " \ 3716 "(both with and without tiered compilation): " \ 3717 "values greater than 1.0 delay counter overflow, " \ 3718 "values between 0 and 1.0 rush counter overflow, " \ 3719 "value of 1.0 leaves compilation thresholds unchanged " \ 3720 "value of 0.0 is equivalent to -Xint. " \ 3721 "" \ 3722 "Flag can be set as per-method option. " \ 3723 "If a value is specified for a method, compilation thresholds " \ 3724 "for that method are scaled by both the value of the global flag "\ 3725 "and the value of the per-method flag.") \ 3726 \ 3727 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3728 "Interpreter (tier 0) invocation notification frequency") \ 3729 \ 3730 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3731 "C1 without MDO (tier 2) invocation notification frequency") \ 3732 \ 3733 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3734 "C1 with MDO profiling (tier 3) invocation notification " \ 3735 "frequency") \ 3736 \ 3737 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3738 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3739 \ 3740 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3741 "Interpreter (tier 0) invocation notification frequency") \ 3742 \ 3743 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3744 "C1 without MDO (tier 2) invocation notification frequency") \ 3745 \ 3746 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3747 "C1 with MDO profiling (tier 3) invocation notification " \ 3748 "frequency") \ 3749 \ 3750 product(intx, Tier2CompileThreshold, 0, \ 3751 "threshold at which tier 2 compilation is invoked") \ 3752 \ 3753 product(intx, Tier2BackEdgeThreshold, 0, \ 3754 "Back edge threshold at which tier 2 compilation is invoked") \ 3755 \ 3756 product(intx, Tier3InvocationThreshold, 200, \ 3757 "Compile if number of method invocations crosses this " \ 3758 "threshold") \ 3759 \ 3760 product(intx, Tier3MinInvocationThreshold, 100, \ 3761 "Minimum invocation to compile at tier 3") \ 3762 \ 3763 product(intx, Tier3CompileThreshold, 2000, \ 3764 "Threshold at which tier 3 compilation is invoked (invocation " \ 3765 "minimum must be satisfied") \ 3766 \ 3767 product(intx, Tier3BackEdgeThreshold, 60000, \ 3768 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3769 \ 3770 product(intx, Tier4InvocationThreshold, 5000, \ 3771 "Compile if number of method invocations crosses this " \ 3772 "threshold") \ 3773 \ 3774 product(intx, Tier4MinInvocationThreshold, 600, \ 3775 "Minimum invocation to compile at tier 4") \ 3776 \ 3777 product(intx, Tier4CompileThreshold, 15000, \ 3778 "Threshold at which tier 4 compilation is invoked (invocation " \ 3779 "minimum must be satisfied") \ 3780 \ 3781 product(intx, Tier4BackEdgeThreshold, 40000, \ 3782 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3783 \ 3784 product(intx, Tier3DelayOn, 5, \ 3785 "If C2 queue size grows over this amount per compiler thread " \ 3786 "stop compiling at tier 3 and start compiling at tier 2") \ 3787 \ 3788 product(intx, Tier3DelayOff, 2, \ 3789 "If C2 queue size is less than this amount per compiler thread " \ 3790 "allow methods compiled at tier 2 transition to tier 3") \ 3791 \ 3792 product(intx, Tier3LoadFeedback, 5, \ 3793 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3794 "reaches this amount per compiler thread") \ 3795 \ 3796 product(intx, Tier4LoadFeedback, 3, \ 3797 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3798 "reaches this amount per compiler thread") \ 3799 \ 3800 product(intx, TieredCompileTaskTimeout, 50, \ 3801 "Kill compile task if method was not used within " \ 3802 "given timeout in milliseconds") \ 3803 \ 3804 product(intx, TieredStopAtLevel, 4, \ 3805 "Stop at given compilation level") \ 3806 \ 3807 product(intx, Tier0ProfilingStartPercentage, 200, \ 3808 "Start profiling in interpreter if the counters exceed tier 3 " \ 3809 "thresholds by the specified percentage") \ 3810 \ 3811 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3812 "Increase the compile threshold for C1 compilation if the code " \ 3813 "cache is filled by the specified percentage") \ 3814 range(0, 99) \ 3815 \ 3816 product(intx, TieredRateUpdateMinTime, 1, \ 3817 "Minimum rate sampling interval (in milliseconds)") \ 3818 \ 3819 product(intx, TieredRateUpdateMaxTime, 25, \ 3820 "Maximum rate sampling interval (in milliseconds)") \ 3821 \ 3822 product_pd(bool, TieredCompilation, \ 3823 "Enable tiered compilation") \ 3824 \ 3825 product(bool, PrintTieredEvents, false, \ 3826 "Print tiered events notifications") \ 3827 \ 3828 product_pd(intx, OnStackReplacePercentage, \ 3829 "NON_TIERED number of method invocations/branches (expressed as " \ 3830 "% of CompileThreshold) before (re-)compiling OSR code") \ 3831 \ 3832 product(intx, InterpreterProfilePercentage, 33, \ 3833 "NON_TIERED number of method invocations/branches (expressed as " \ 3834 "% of CompileThreshold) before profiling in the interpreter") \ 3835 range(0, 100) \ 3836 \ 3837 develop(intx, MaxRecompilationSearchLength, 10, \ 3838 "The maximum number of frames to inspect when searching for " \ 3839 "recompilee") \ 3840 \ 3841 develop(intx, MaxInterpretedSearchLength, 3, \ 3842 "The maximum number of interpreted frames to skip when searching "\ 3843 "for recompilee") \ 3844 \ 3845 develop(intx, DesiredMethodLimit, 8000, \ 3846 "The desired maximum method size (in bytecodes) after inlining") \ 3847 \ 3848 develop(intx, HugeMethodLimit, 8000, \ 3849 "Don't compile methods larger than this if " \ 3850 "+DontCompileHugeMethods") \ 3851 \ 3852 /* New JDK 1.4 reflection implementation */ \ 3853 \ 3854 develop(intx, FastSuperclassLimit, 8, \ 3855 "Depth of hardwired instanceof accelerator array") \ 3856 \ 3857 /* Properties for Java libraries */ \ 3858 \ 3859 product(size_t, MaxDirectMemorySize, 0, \ 3860 "Maximum total size of NIO direct-buffer allocations") \ 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 \ 3890 develop(bool, PerfTraceDataCreation, false, \ 3891 "Trace creation of Performance Data Entries") \ 3892 \ 3893 develop(bool, PerfTraceMemOps, false, \ 3894 "Trace PerfMemory create/attach/detach calls") \ 3895 \ 3896 product(bool, PerfDisableSharedMem, false, \ 3897 "Store performance data in standard memory") \ 3898 \ 3899 product(intx, PerfDataMemorySize, 64*K, \ 3900 "Size of performance data memory region. Will be rounded " \ 3901 "up to a multiple of the native os page size.") \ 3902 \ 3903 product(intx, PerfMaxStringConstLength, 1024, \ 3904 "Maximum PerfStringConstant string length before truncation") \ 3905 \ 3906 product(bool, PerfAllowAtExitRegistration, false, \ 3907 "Allow registration of atexit() methods") \ 3908 \ 3909 product(bool, PerfBypassFileSystemCheck, false, \ 3910 "Bypass Win32 file system criteria checks (Windows Only)") \ 3911 \ 3912 product(intx, UnguardOnExecutionViolation, 0, \ 3913 "Unguard page and retry on no-execute fault (Win32 only) " \ 3914 "0=off, 1=conservative, 2=aggressive") \ 3915 range(0, 2) \ 3916 \ 3917 /* Serviceability Support */ \ 3918 \ 3919 product(bool, ManagementServer, false, \ 3920 "Create JMX Management Server") \ 3921 \ 3922 product(bool, DisableAttachMechanism, false, \ 3923 "Disable mechanism that allows tools to attach to this VM") \ 3924 \ 3925 product(bool, StartAttachListener, false, \ 3926 "Always start Attach Listener at VM startup") \ 3927 \ 3928 manageable(bool, PrintConcurrentLocks, false, \ 3929 "Print java.util.concurrent locks in thread dump") \ 3930 \ 3931 product(bool, TransmitErrorReport, false, \ 3932 "Enable error report transmission on erroneous termination") \ 3933 \ 3934 product(ccstr, ErrorReportServer, NULL, \ 3935 "Override built-in error report server address") \ 3936 \ 3937 /* Shared spaces */ \ 3938 \ 3939 product(bool, UseSharedSpaces, true, \ 3940 "Use shared spaces for metadata") \ 3941 \ 3942 product(bool, VerifySharedSpaces, false, \ 3943 "Verify shared spaces (false for default archive, true for " \ 3944 "archive specified by -XX:SharedArchiveFile)") \ 3945 \ 3946 product(bool, RequireSharedSpaces, false, \ 3947 "Require shared spaces for metadata") \ 3948 \ 3949 product(bool, DumpSharedSpaces, false, \ 3950 "Special mode: JVM reads a class list, loads classes, builds " \ 3951 "shared spaces, and dumps the shared spaces to a file to be " \ 3952 "used in future JVM runs") \ 3953 \ 3954 product(bool, PrintSharedSpaces, false, \ 3955 "Print usage of shared spaces") \ 3956 \ 3957 product(bool, PrintSharedArchiveAndExit, false, \ 3958 "Print shared archive file contents") \ 3959 \ 3960 product(bool, PrintSharedDictionary, false, \ 3961 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3962 "dictionary") \ 3963 \ 3964 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3965 "Size of read-write space for metadata (in bytes)") \ 3966 \ 3967 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3968 "Size of read-only space for metadata (in bytes)") \ 3969 \ 3970 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3971 "Size of the shared miscellaneous data area (in bytes)") \ 3972 \ 3973 product(uintx, SharedMiscCodeSize, 120*K, \ 3974 "Size of the shared miscellaneous code area (in bytes)") \ 3975 \ 3976 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3977 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3978 "Address to allocate shared memory region for class data") \ 3979 \ 3980 product(uintx, SharedSymbolTableBucketSize, 4, \ 3981 "Average number of symbols per bucket in shared table") \ 3982 \ 3983 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3984 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3985 "classes. Just exclude them from the shared dictionary.") \ 3986 \ 3987 diagnostic(bool, PrintMethodHandleStubs, false, \ 3988 "Print generated stub code for method handles") \ 3989 \ 3990 develop(bool, TraceMethodHandles, false, \ 3991 "trace internal method handle operations") \ 3992 \ 3993 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3994 "perform extra checks when constructing method handles") \ 3995 \ 3996 diagnostic(bool, ShowHiddenFrames, false, \ 3997 "show method handle implementation frames (usually hidden)") \ 3998 \ 3999 experimental(bool, TrustFinalNonStaticFields, false, \ 4000 "trust final non-static declarations for constant folding") \ 4001 \ 4002 diagnostic(bool, FoldStableValues, true, \ 4003 "Optimize loads from stable fields (marked w/ @Stable)") \ 4004 \ 4005 develop(bool, TraceInvokeDynamic, false, \ 4006 "trace internal invoke dynamic operations") \ 4007 \ 4008 diagnostic(bool, PauseAtStartup, false, \ 4009 "Causes the VM to pause at startup time and wait for the pause " \ 4010 "file to be removed (default: ./vm.paused.<pid>)") \ 4011 \ 4012 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 4013 "The file to create and for whose removal to await when pausing " \ 4014 "at startup. (default: ./vm.paused.<pid>)") \ 4015 \ 4016 diagnostic(bool, PauseAtExit, false, \ 4017 "Pause and wait for keypress on exit if a debugger is attached") \ 4018 \ 4019 product(bool, ExtendedDTraceProbes, false, \ 4020 "Enable performance-impacting dtrace probes") \ 4021 \ 4022 product(bool, DTraceMethodProbes, false, \ 4023 "Enable dtrace probes for method-entry and method-exit") \ 4024 \ 4025 product(bool, DTraceAllocProbes, false, \ 4026 "Enable dtrace probes for object allocation") \ 4027 \ 4028 product(bool, DTraceMonitorProbes, false, \ 4029 "Enable dtrace probes for monitor events") \ 4030 \ 4031 product(bool, RelaxAccessControlCheck, false, \ 4032 "Relax the access control checks in the verifier") \ 4033 \ 4034 product(uintx, StringTableSize, defaultStringTableSize, \ 4035 "Number of buckets in the interned String table") \ 4036 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4037 \ 4038 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4039 "Number of buckets in the JVM internal Symbol table") \ 4040 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4041 \ 4042 product(bool, UseStringDeduplication, false, \ 4043 "Use string deduplication") \ 4044 \ 4045 product(bool, PrintStringDeduplicationStatistics, false, \ 4046 "Print string deduplication statistics") \ 4047 \ 4048 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4049 "A string must reach this age (or be promoted to an old region) " \ 4050 "to be considered for deduplication") \ 4051 range(1, markOopDesc::max_age) \ 4052 \ 4053 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4054 "Force table resize every time the table is scanned") \ 4055 \ 4056 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4057 "Force table rehash every time the table is scanned") \ 4058 \ 4059 develop(bool, TraceDefaultMethods, false, \ 4060 "Trace the default method processing steps") \ 4061 \ 4062 diagnostic(bool, WhiteBoxAPI, false, \ 4063 "Enable internal testing APIs") \ 4064 \ 4065 product(bool, PrintGCCause, true, \ 4066 "Include GC cause in GC logging") \ 4067 \ 4068 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4069 "Default survivor space alignment in bytes") \ 4070 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4071 \ 4072 product(bool , AllowNonVirtualCalls, false, \ 4073 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4074 \ 4075 product(ccstr, DumpLoadedClassList, NULL, \ 4076 "Dump the names all loaded classes, that could be stored into " \ 4077 "the CDS archive, in the specified file") \ 4078 \ 4079 product(ccstr, SharedClassListFile, NULL, \ 4080 "Override the default CDS class list") \ 4081 \ 4082 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4083 "Override the default location of the CDS archive file") \ 4084 \ 4085 product(ccstr, ExtraSharedClassListFile, NULL, \ 4086 "Extra classlist for building the CDS archive file") \ 4087 \ 4088 experimental(size_t, ArrayAllocatorMallocLimit, \ 4089 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4090 "Allocation less than this value will be allocated " \ 4091 "using malloc. Larger allocations will use mmap.") \ 4092 \ 4093 experimental(bool, AlwaysAtomicAccesses, false, \ 4094 "Accesses to all variables should always be atomic") \ 4095 \ 4096 product(bool, EnableTracing, false, \ 4097 "Enable event-based tracing") \ 4098 \ 4099 product(bool, UseLockedTracing, false, \ 4100 "Use locked-tracing when doing event-based tracing") \ 4101 \ 4102 diagnostic(bool, UseUnalignedAccesses, false, \ 4103 "Use unaligned memory accesses in sun.misc.Unsafe") \ 4104 \ 4105 product_pd(bool, PreserveFramePointer, \ 4106 "Use the FP register for holding the frame pointer " \ 4107 "and not as a general purpose register.") \ 4108 \ 4109 diagnostic(bool, CheckIntrinsics, true, \ 4110 "When a class C is loaded, check that " \ 4111 "(1) all intrinsics defined by the VM for class C are present "\ 4112 "in the loaded class file and are marked with the " \ 4113 "@HotSpotIntrinsicCandidate annotation, that " \ 4114 "(2) there is an intrinsic registered for all loaded methods " \ 4115 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4116 "annotation, and that " \ 4117 "(3) no orphan methods exist for class C (i.e., methods for " \ 4118 "which the VM declares an intrinsic but that are not declared "\ 4119 "in the loaded class C. " \ 4120 "Check (3) is available only in debug builds.") 4121 4122 /* 4123 * Macros for factoring of globals 4124 */ 4125 4126 // Interface macros 4127 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4128 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4129 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4130 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4131 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4132 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4133 #ifdef PRODUCT 4134 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4135 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4136 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4137 #else 4138 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4139 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4140 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4141 #endif // PRODUCT 4142 // Special LP64 flags, product only needed for now. 4143 #ifdef _LP64 4144 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4145 #else 4146 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4147 #endif // _LP64 4148 4149 // Implementation macros 4150 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4151 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4152 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4153 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4154 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4155 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4156 #ifdef PRODUCT 4157 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4158 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4159 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4160 #else 4161 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4162 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4163 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4164 #endif // PRODUCT 4165 #ifdef _LP64 4166 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4167 #else 4168 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4169 #endif // _LP64 4170 4171 // Only materialize src code for range checking when required, ignore otherwise 4172 #define IGNORE_RANGE(a, b) 4173 // Only materialize src code for contraint checking when required, ignore otherwise 4174 #define IGNORE_CONSTRAINT(func,type) 4175 4176 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4177 DECLARE_PD_DEVELOPER_FLAG, \ 4178 DECLARE_PRODUCT_FLAG, \ 4179 DECLARE_PD_PRODUCT_FLAG, \ 4180 DECLARE_DIAGNOSTIC_FLAG, \ 4181 DECLARE_EXPERIMENTAL_FLAG, \ 4182 DECLARE_NOTPRODUCT_FLAG, \ 4183 DECLARE_MANAGEABLE_FLAG, \ 4184 DECLARE_PRODUCT_RW_FLAG, \ 4185 DECLARE_LP64_PRODUCT_FLAG, \ 4186 IGNORE_RANGE, \ 4187 IGNORE_CONSTRAINT) 4188 4189 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4190 DECLARE_PD_DEVELOPER_FLAG, \ 4191 DECLARE_PRODUCT_FLAG, \ 4192 DECLARE_PD_PRODUCT_FLAG, \ 4193 DECLARE_DIAGNOSTIC_FLAG, \ 4194 DECLARE_NOTPRODUCT_FLAG, \ 4195 IGNORE_RANGE, \ 4196 IGNORE_CONSTRAINT) 4197 4198 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4199 DECLARE_PRODUCT_FLAG, \ 4200 DECLARE_DIAGNOSTIC_FLAG, \ 4201 DECLARE_EXPERIMENTAL_FLAG, \ 4202 DECLARE_NOTPRODUCT_FLAG, \ 4203 IGNORE_RANGE, \ 4204 IGNORE_CONSTRAINT) 4205 4206 // Extensions 4207 4208 #include "runtime/globals_ext.hpp" 4209 4210 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP