1 /* 2 * Copyright (c) 1997, 2017, 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/align.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 31 32 #include <float.h> // for DBL_MAX 33 34 // The larger HeapWordSize for 64bit requires larger heaps 35 // for the same application running in 64bit. See bug 4967770. 36 // The minimum alignment to a heap word size is done. Other 37 // parts of the memory system may require additional alignment 38 // and are responsible for those alignments. 39 #ifdef _LP64 40 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize) 41 #else 42 #define ScaleForWordSize(x) (x) 43 #endif 44 45 // use this for flags that are true per default in the tiered build 46 // but false in non-tiered builds, and vice versa 47 #ifdef TIERED 48 #define trueInTiered true 49 #define falseInTiered false 50 #else 51 #define trueInTiered false 52 #define falseInTiered true 53 #endif 54 55 #include CPU_HEADER(globals) 56 #include OS_HEADER(globals) 57 #include OS_CPU_HEADER(globals) 58 #ifdef COMPILER1 59 #include CPU_HEADER(c1_globals) 60 #include OS_HEADER(c1_globals) 61 #endif 62 #ifdef COMPILER2 63 #include CPU_HEADER(c2_globals) 64 #include OS_HEADER(c2_globals) 65 #endif 66 #ifdef SHARK 67 #ifdef ZERO 68 # include "shark_globals_zero.hpp" 69 #endif 70 #endif 71 72 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI 73 define_pd_global(bool, BackgroundCompilation, false); 74 define_pd_global(bool, UseTLAB, false); 75 define_pd_global(bool, CICompileOSR, false); 76 define_pd_global(bool, UseTypeProfile, false); 77 define_pd_global(bool, UseOnStackReplacement, false); 78 define_pd_global(bool, InlineIntrinsics, false); 79 define_pd_global(bool, PreferInterpreterNativeStubs, true); 80 define_pd_global(bool, ProfileInterpreter, false); 81 define_pd_global(bool, ProfileTraps, false); 82 define_pd_global(bool, TieredCompilation, false); 83 84 define_pd_global(intx, CompileThreshold, 0); 85 86 define_pd_global(intx, OnStackReplacePercentage, 0); 87 define_pd_global(bool, ResizeTLAB, false); 88 define_pd_global(intx, FreqInlineSize, 0); 89 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 90 define_pd_global(intx, InlineClassNatives, true); 91 define_pd_global(intx, InlineUnsafeOps, true); 92 define_pd_global(intx, InitialCodeCacheSize, 160*K); 93 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 94 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 95 define_pd_global(intx, ProfiledCodeHeapSize, 0); 96 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 97 98 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 99 define_pd_global(intx, CodeCacheMinBlockLength, 1); 100 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 101 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 102 define_pd_global(bool, NeverActAsServerClassMachine, true); 103 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 104 #define CI_COMPILER_COUNT 0 105 #else 106 107 #if defined(COMPILER2) || INCLUDE_JVMCI 108 #define CI_COMPILER_COUNT 2 109 #else 110 #define CI_COMPILER_COUNT 1 111 #endif // COMPILER2 || INCLUDE_JVMCI 112 113 #endif // no compilers 114 115 // string type aliases used only in this file 116 typedef const char* ccstr; 117 typedef const char* ccstrlist; // represents string arguments which accumulate 118 119 // function type that will construct default range string 120 typedef const char* (*RangeStrFunc)(void); 121 122 struct Flag { 123 enum Flags { 124 // latest value origin 125 DEFAULT = 0, 126 COMMAND_LINE = 1, 127 ENVIRON_VAR = 2, 128 CONFIG_FILE = 3, 129 MANAGEMENT = 4, 130 ERGONOMIC = 5, 131 ATTACH_ON_DEMAND = 6, 132 INTERNAL = 7, 133 134 LAST_VALUE_ORIGIN = INTERNAL, 135 VALUE_ORIGIN_BITS = 4, 136 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 137 138 // flag kind 139 KIND_PRODUCT = 1 << 4, 140 KIND_MANAGEABLE = 1 << 5, 141 KIND_DIAGNOSTIC = 1 << 6, 142 KIND_EXPERIMENTAL = 1 << 7, 143 KIND_NOT_PRODUCT = 1 << 8, 144 KIND_DEVELOP = 1 << 9, 145 KIND_PLATFORM_DEPENDENT = 1 << 10, 146 KIND_READ_WRITE = 1 << 11, 147 KIND_C1 = 1 << 12, 148 KIND_C2 = 1 << 13, 149 KIND_ARCH = 1 << 14, 150 KIND_SHARK = 1 << 15, 151 KIND_LP64_PRODUCT = 1 << 16, 152 KIND_COMMERCIAL = 1 << 17, 153 KIND_JVMCI = 1 << 18, 154 155 // set this bit if the flag was set on the command line 156 ORIG_COMMAND_LINE = 1 << 19, 157 158 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE) 159 }; 160 161 enum Error { 162 // no error 163 SUCCESS = 0, 164 // flag name is missing 165 MISSING_NAME, 166 // flag value is missing 167 MISSING_VALUE, 168 // error parsing the textual form of the value 169 WRONG_FORMAT, 170 // flag is not writable 171 NON_WRITABLE, 172 // flag value is outside of its bounds 173 OUT_OF_BOUNDS, 174 // flag value violates its constraint 175 VIOLATES_CONSTRAINT, 176 // there is no flag with the given name 177 INVALID_FLAG, 178 // the flag can only be set only on command line during invocation of the VM 179 COMMAND_LINE_ONLY, 180 // the flag may only be set once 181 SET_ONLY_ONCE, 182 // the flag is not writable in this combination of product/debug build 183 CONSTANT, 184 // other, unspecified error related to setting the flag 185 ERR_OTHER 186 }; 187 188 enum MsgType { 189 NONE = 0, 190 DIAGNOSTIC_FLAG_BUT_LOCKED, 191 EXPERIMENTAL_FLAG_BUT_LOCKED, 192 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 193 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 194 }; 195 196 const char* _type; 197 const char* _name; 198 void* _addr; 199 NOT_PRODUCT(const char* _doc;) 200 Flags _flags; 201 size_t _name_len; 202 203 // points to all Flags static array 204 static Flag* flags; 205 206 // number of flags 207 static size_t numFlags; 208 209 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 210 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 211 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 212 213 static const char* get_int_default_range_str(); 214 static const char* get_uint_default_range_str(); 215 static const char* get_intx_default_range_str(); 216 static const char* get_uintx_default_range_str(); 217 static const char* get_uint64_t_default_range_str(); 218 static const char* get_size_t_default_range_str(); 219 static const char* get_double_default_range_str(); 220 221 Flag::Error check_writable(bool changed); 222 223 bool is_bool() const; 224 bool get_bool() const; 225 Flag::Error set_bool(bool value); 226 227 bool is_int() const; 228 int get_int() const; 229 Flag::Error set_int(int value); 230 231 bool is_uint() const; 232 uint get_uint() const; 233 Flag::Error set_uint(uint value); 234 235 bool is_intx() const; 236 intx get_intx() const; 237 Flag::Error set_intx(intx value); 238 239 bool is_uintx() const; 240 uintx get_uintx() const; 241 Flag::Error set_uintx(uintx value); 242 243 bool is_uint64_t() const; 244 uint64_t get_uint64_t() const; 245 Flag::Error set_uint64_t(uint64_t value); 246 247 bool is_size_t() const; 248 size_t get_size_t() const; 249 Flag::Error set_size_t(size_t value); 250 251 bool is_double() const; 252 double get_double() const; 253 Flag::Error set_double(double value); 254 255 bool is_ccstr() const; 256 bool ccstr_accumulates() const; 257 ccstr get_ccstr() const; 258 Flag::Error set_ccstr(ccstr value); 259 260 Flags get_origin(); 261 void set_origin(Flags origin); 262 263 size_t get_name_length(); 264 265 bool is_default(); 266 bool is_ergonomic(); 267 bool is_command_line(); 268 void set_command_line(); 269 270 bool is_product() const; 271 bool is_manageable() const; 272 bool is_diagnostic() const; 273 bool is_experimental() const; 274 bool is_notproduct() const; 275 bool is_develop() const; 276 bool is_read_write() const; 277 bool is_commercial() const; 278 279 bool is_constant_in_binary() const; 280 281 bool is_unlocker() const; 282 bool is_unlocked() const; 283 bool is_writeable() const; 284 bool is_external() const; 285 286 bool is_unlocker_ext() const; 287 bool is_unlocked_ext() const; 288 bool is_writeable_ext() const; 289 bool is_external_ext() const; 290 291 void clear_diagnostic(); 292 293 Flag::MsgType get_locked_message(char*, int) const; 294 void get_locked_message_ext(char*, int) const; 295 296 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 297 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 298 void print_kind_and_origin(outputStream* st); 299 void print_as_flag(outputStream* st); 300 301 static const char* flag_error_str(Flag::Error error); 302 }; 303 304 // debug flags control various aspects of the VM and are global accessible 305 306 // use FlagSetting to temporarily change some debug flag 307 // e.g. FlagSetting fs(DebugThisAndThat, true); 308 // restored to previous value upon leaving scope 309 class FlagSetting { 310 bool val; 311 bool* flag; 312 public: 313 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 314 ~FlagSetting() { *flag = val; } 315 }; 316 317 318 class CounterSetting { 319 intx* counter; 320 public: 321 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 322 ~CounterSetting() { (*counter)--; } 323 }; 324 325 class IntFlagSetting { 326 int val; 327 int* flag; 328 public: 329 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 330 ~IntFlagSetting() { *flag = val; } 331 }; 332 333 class UIntFlagSetting { 334 uint val; 335 uint* flag; 336 public: 337 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 338 ~UIntFlagSetting() { *flag = val; } 339 }; 340 341 class UIntXFlagSetting { 342 uintx val; 343 uintx* flag; 344 public: 345 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 346 ~UIntXFlagSetting() { *flag = val; } 347 }; 348 349 class DoubleFlagSetting { 350 double val; 351 double* flag; 352 public: 353 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 354 ~DoubleFlagSetting() { *flag = val; } 355 }; 356 357 class SizeTFlagSetting { 358 size_t val; 359 size_t* flag; 360 public: 361 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 362 ~SizeTFlagSetting() { *flag = val; } 363 }; 364 365 // Helper class for temporarily saving the value of a flag during a scope. 366 template <size_t SIZE> 367 class FlagGuard { 368 unsigned char _value[SIZE]; 369 void* const _addr; 370 371 // Hide operator new, this class should only be allocated on the stack. 372 // NOTE: Cannot include memory/allocation.hpp here due to circular 373 // dependencies. 374 void* operator new(size_t size) throw(); 375 void* operator new [](size_t size) throw(); 376 377 public: 378 FlagGuard(void* flag_addr) : _addr(flag_addr) { 379 memcpy(_value, _addr, SIZE); 380 } 381 382 ~FlagGuard() { 383 memcpy(_addr, _value, SIZE); 384 } 385 }; 386 387 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 388 389 class CommandLineFlags { 390 public: 391 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 392 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); } 393 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 394 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 395 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 396 397 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 398 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); } 399 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 400 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 401 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 402 403 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 404 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); } 405 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 406 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 407 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 408 409 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 410 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); } 411 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 412 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 413 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 414 415 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 416 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); } 417 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 418 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 419 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 420 421 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 422 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); } 423 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 424 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 425 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 426 427 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 428 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); } 429 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 430 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 431 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 432 433 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 434 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); } 435 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 436 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 437 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 438 439 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 440 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); } 441 // Contract: Flag will make private copy of the incoming value. 442 // Outgoing value is always malloc-ed, and caller MUST call free. 443 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 444 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 445 446 // Returns false if name is not a command line flag. 447 static bool wasSetOnCmdline(const char* name, bool* value); 448 static void printSetFlags(outputStream* out); 449 450 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 451 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 452 453 static void verify() PRODUCT_RETURN; 454 }; 455 456 // use this for flags that are true by default in the debug version but 457 // false in the optimized version, and vice versa 458 #ifdef ASSERT 459 #define trueInDebug true 460 #define falseInDebug false 461 #else 462 #define trueInDebug false 463 #define falseInDebug true 464 #endif 465 466 // use this for flags that are true per default in the product build 467 // but false in development builds, and vice versa 468 #ifdef PRODUCT 469 #define trueInProduct true 470 #define falseInProduct false 471 #else 472 #define trueInProduct false 473 #define falseInProduct true 474 #endif 475 476 // develop flags are settable / visible only during development and are constant in the PRODUCT version 477 // product flags are always settable / visible 478 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 479 480 // A flag must be declared with one of the following types: 481 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 482 // The type "ccstr" is an alias for "const char*" and is used 483 // only in this file, because the macrology requires single-token type names. 484 485 // Note: Diagnostic options not meant for VM tuning or for product modes. 486 // They are to be used for VM quality assurance or field diagnosis 487 // of VM bugs. They are hidden so that users will not be encouraged to 488 // try them as if they were VM ordinary execution options. However, they 489 // are available in the product version of the VM. Under instruction 490 // from support engineers, VM customers can turn them on to collect 491 // diagnostic information about VM problems. To use a VM diagnostic 492 // option, you must first specify +UnlockDiagnosticVMOptions. 493 // (This master switch also affects the behavior of -Xprintflags.) 494 // 495 // experimental flags are in support of features that are not 496 // part of the officially supported product, but are available 497 // for experimenting with. They could, for example, be performance 498 // features that may not have undergone full or rigorous QA, but which may 499 // help performance in some cases and released for experimentation 500 // by the community of users and developers. This flag also allows one to 501 // be able to build a fully supported product that nonetheless also 502 // ships with some unsupported, lightly tested, experimental features. 503 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 504 // UnlockExperimentalVMOptions flag, which allows the control and 505 // modification of the experimental flags. 506 // 507 // Nota bene: neither diagnostic nor experimental options should be used casually, 508 // and they are not supported on production loads, except under explicit 509 // direction from support engineers. 510 // 511 // manageable flags are writeable external product flags. 512 // They are dynamically writeable through the JDK management interface 513 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 514 // These flags are external exported interface (see CCC). The list of 515 // manageable flags can be queried programmatically through the management 516 // interface. 517 // 518 // A flag can be made as "manageable" only if 519 // - the flag is defined in a CCC as an external exported interface. 520 // - the VM implementation supports dynamic setting of the flag. 521 // This implies that the VM must *always* query the flag variable 522 // and not reuse state related to the flag state at any given time. 523 // - you want the flag to be queried programmatically by the customers. 524 // 525 // product_rw flags are writeable internal product flags. 526 // They are like "manageable" flags but for internal/private use. 527 // The list of product_rw flags are internal/private flags which 528 // may be changed/removed in a future release. It can be set 529 // through the management interface to get/set value 530 // when the name of flag is supplied. 531 // 532 // A flag can be made as "product_rw" only if 533 // - the VM implementation supports dynamic setting of the flag. 534 // This implies that the VM must *always* query the flag variable 535 // and not reuse state related to the flag state at any given time. 536 // 537 // Note that when there is a need to support develop flags to be writeable, 538 // it can be done in the same way as product_rw. 539 // 540 // range is a macro that will expand to min and max arguments for range 541 // checking code if provided - see commandLineFlagRangeList.hpp 542 // 543 // constraint is a macro that will expand to custom function call 544 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 545 // 546 // writeable is a macro that controls if and how the value can change during the runtime 547 // 548 // writeable(Always) is optional and allows the flag to have its value changed 549 // without any limitations at any time 550 // 551 // writeable(Once) flag value's can be only set once during the lifetime of VM 552 // 553 // writeable(CommandLineOnly) flag value's can be only set from command line 554 // (multiple times allowed) 555 // 556 557 558 #define RUNTIME_FLAGS(develop, \ 559 develop_pd, \ 560 product, \ 561 product_pd, \ 562 diagnostic, \ 563 diagnostic_pd, \ 564 experimental, \ 565 notproduct, \ 566 manageable, \ 567 product_rw, \ 568 lp64_product, \ 569 range, \ 570 constraint, \ 571 writeable) \ 572 \ 573 lp64_product(bool, UseCompressedOops, false, \ 574 "Use 32-bit object references in 64-bit VM. " \ 575 "lp64_product means flag is always constant in 32 bit VM") \ 576 \ 577 lp64_product(bool, UseCompressedClassPointers, false, \ 578 "Use 32-bit class pointers in 64-bit VM. " \ 579 "lp64_product means flag is always constant in 32 bit VM") \ 580 \ 581 notproduct(bool, CheckCompressedOops, true, \ 582 "Generate checks in encoding/decoding code in debug VM") \ 583 \ 584 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 585 "Heap allocation steps through preferred address regions to find" \ 586 " where it can allocate the heap. Number of steps to take per " \ 587 "region.") \ 588 range(1, max_uintx) \ 589 \ 590 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 591 "Default object alignment in bytes, 8 is minimum") \ 592 range(8, 256) \ 593 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 594 \ 595 product(bool, AssumeMP, false, \ 596 "Instruct the VM to assume multiple processors are available") \ 597 \ 598 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 599 /* removal testing. It was supposed to be removed before FCS but has */ \ 600 /* been re-added (see 6401008) */ \ 601 product_pd(bool, UseMembar, \ 602 "(Unstable) Issues membars on thread state transitions") \ 603 \ 604 develop(bool, CleanChunkPoolAsync, true, \ 605 "Clean the chunk pool asynchronously") \ 606 \ 607 experimental(bool, AlwaysSafeConstructors, false, \ 608 "Force safe construction, as if all fields are final.") \ 609 \ 610 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 611 "Enable normal processing of flags relating to field diagnostics")\ 612 \ 613 experimental(bool, UnlockExperimentalVMOptions, false, \ 614 "Enable normal processing of flags relating to experimental " \ 615 "features") \ 616 \ 617 product(bool, JavaMonitorsInStackTrace, true, \ 618 "Print information about Java monitor locks when the stacks are" \ 619 "dumped") \ 620 \ 621 product_pd(bool, UseLargePages, \ 622 "Use large page memory") \ 623 \ 624 product_pd(bool, UseLargePagesIndividualAllocation, \ 625 "Allocate large pages individually for better affinity") \ 626 \ 627 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 628 "Fail large pages individual allocation") \ 629 \ 630 product(bool, UseLargePagesInMetaspace, false, \ 631 "Use large page memory in metaspace. " \ 632 "Only used if UseLargePages is enabled.") \ 633 \ 634 product(bool, UseNUMA, false, \ 635 "Use NUMA if available") \ 636 \ 637 product(bool, UseNUMAInterleaving, false, \ 638 "Interleave memory across NUMA nodes if available") \ 639 \ 640 product(size_t, NUMAInterleaveGranularity, 2*M, \ 641 "Granularity to use for NUMA interleaving on Windows OS") \ 642 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 643 \ 644 product(bool, ForceNUMA, false, \ 645 "Force NUMA optimizations on single-node/UMA systems") \ 646 \ 647 product(uintx, NUMAChunkResizeWeight, 20, \ 648 "Percentage (0-100) used to weight the current sample when " \ 649 "computing exponentially decaying average for " \ 650 "AdaptiveNUMAChunkSizing") \ 651 range(0, 100) \ 652 \ 653 product(size_t, NUMASpaceResizeRate, 1*G, \ 654 "Do not reallocate more than this amount per collection") \ 655 range(0, max_uintx) \ 656 \ 657 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 658 "Enable adaptive chunk sizing for NUMA") \ 659 \ 660 product(bool, NUMAStats, false, \ 661 "Print NUMA stats in detailed heap information") \ 662 \ 663 product(uintx, NUMAPageScanRate, 256, \ 664 "Maximum number of pages to include in the page scan procedure") \ 665 range(0, max_uintx) \ 666 \ 667 product_pd(bool, NeedsDeoptSuspend, \ 668 "True for register window machines (sparc/ia64)") \ 669 \ 670 product(intx, UseSSE, 99, \ 671 "Highest supported SSE instructions set on x86/x64") \ 672 range(0, 99) \ 673 \ 674 product(bool, UseAES, false, \ 675 "Control whether AES instructions are used when available") \ 676 \ 677 product(bool, UseFMA, false, \ 678 "Control whether FMA instructions are used when available") \ 679 \ 680 product(bool, UseSHA, false, \ 681 "Control whether SHA instructions are used when available") \ 682 \ 683 diagnostic(bool, UseGHASHIntrinsics, false, \ 684 "Use intrinsics for GHASH versions of crypto") \ 685 \ 686 product(size_t, LargePageSizeInBytes, 0, \ 687 "Large page size (0 to let VM choose the page size)") \ 688 range(0, max_uintx) \ 689 \ 690 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 691 "Use large pages if maximum heap is at least this big") \ 692 range(0, max_uintx) \ 693 \ 694 product(bool, ForceTimeHighResolution, false, \ 695 "Using high time resolution (for Win32 only)") \ 696 \ 697 develop(bool, TracePcPatching, false, \ 698 "Trace usage of frame::patch_pc") \ 699 \ 700 develop(bool, TraceRelocator, false, \ 701 "Trace the bytecode relocator") \ 702 \ 703 develop(bool, TraceLongCompiles, false, \ 704 "Print out every time compilation is longer than " \ 705 "a given threshold") \ 706 \ 707 develop(bool, SafepointALot, false, \ 708 "Generate a lot of safepoints. This works with " \ 709 "GuaranteedSafepointInterval") \ 710 \ 711 product_pd(bool, BackgroundCompilation, \ 712 "A thread requesting compilation is not blocked during " \ 713 "compilation") \ 714 \ 715 product(bool, PrintVMQWaitTime, false, \ 716 "Print out the waiting time in VM operation queue") \ 717 \ 718 product(bool, MethodFlushing, true, \ 719 "Reclamation of zombie and not-entrant methods") \ 720 \ 721 develop(bool, VerifyStack, false, \ 722 "Verify stack of each thread when it is entering a runtime call") \ 723 \ 724 diagnostic(bool, ForceUnreachable, false, \ 725 "Make all non code cache addresses to be unreachable by " \ 726 "forcing use of 64bit literal fixups") \ 727 \ 728 notproduct(bool, StressDerivedPointers, false, \ 729 "Force scavenge when a derived pointer is detected on stack " \ 730 "after rtm call") \ 731 \ 732 develop(bool, TraceDerivedPointers, false, \ 733 "Trace traversal of derived pointers on stack") \ 734 \ 735 notproduct(bool, TraceCodeBlobStacks, false, \ 736 "Trace stack-walk of codeblobs") \ 737 \ 738 product(bool, PrintJNIResolving, false, \ 739 "Used to implement -v:jni") \ 740 \ 741 notproduct(bool, PrintRewrites, false, \ 742 "Print methods that are being rewritten") \ 743 \ 744 product(bool, UseInlineCaches, true, \ 745 "Use Inline Caches for virtual calls ") \ 746 \ 747 diagnostic(bool, InlineArrayCopy, true, \ 748 "Inline arraycopy native that is known to be part of " \ 749 "base library DLL") \ 750 \ 751 diagnostic(bool, InlineObjectHash, true, \ 752 "Inline Object::hashCode() native that is known to be part " \ 753 "of base library DLL") \ 754 \ 755 diagnostic(bool, InlineNatives, true, \ 756 "Inline natives that are known to be part of base library DLL") \ 757 \ 758 diagnostic(bool, InlineMathNatives, true, \ 759 "Inline SinD, CosD, etc.") \ 760 \ 761 diagnostic(bool, InlineClassNatives, true, \ 762 "Inline Class.isInstance, etc") \ 763 \ 764 diagnostic(bool, InlineThreadNatives, true, \ 765 "Inline Thread.currentThread, etc") \ 766 \ 767 diagnostic(bool, InlineUnsafeOps, true, \ 768 "Inline memory ops (native methods) from Unsafe") \ 769 \ 770 product(bool, CriticalJNINatives, true, \ 771 "Check for critical JNI entry points") \ 772 \ 773 notproduct(bool, StressCriticalJNINatives, false, \ 774 "Exercise register saving code in critical natives") \ 775 \ 776 diagnostic(bool, UseAESIntrinsics, false, \ 777 "Use intrinsics for AES versions of crypto") \ 778 \ 779 diagnostic(bool, UseAESCTRIntrinsics, false, \ 780 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 781 \ 782 diagnostic(bool, UseSHA1Intrinsics, false, \ 783 "Use intrinsics for SHA-1 crypto hash function. " \ 784 "Requires that UseSHA is enabled.") \ 785 \ 786 diagnostic(bool, UseSHA256Intrinsics, false, \ 787 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 788 "Requires that UseSHA is enabled.") \ 789 \ 790 diagnostic(bool, UseSHA512Intrinsics, false, \ 791 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 792 "Requires that UseSHA is enabled.") \ 793 \ 794 diagnostic(bool, UseCRC32Intrinsics, false, \ 795 "use intrinsics for java.util.zip.CRC32") \ 796 \ 797 diagnostic(bool, UseCRC32CIntrinsics, false, \ 798 "use intrinsics for java.util.zip.CRC32C") \ 799 \ 800 diagnostic(bool, UseAdler32Intrinsics, false, \ 801 "use intrinsics for java.util.zip.Adler32") \ 802 \ 803 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 804 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 805 \ 806 diagnostic(ccstrlist, DisableIntrinsic, "", \ 807 "do not expand intrinsics whose (internal) names appear here") \ 808 \ 809 develop(bool, TraceCallFixup, false, \ 810 "Trace all call fixups") \ 811 \ 812 develop(bool, DeoptimizeALot, false, \ 813 "Deoptimize at every exit from the runtime system") \ 814 \ 815 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 816 "A comma separated list of bcis to deoptimize at") \ 817 \ 818 product(bool, DeoptimizeRandom, false, \ 819 "Deoptimize random frames on random exit from the runtime system")\ 820 \ 821 notproduct(bool, ZombieALot, false, \ 822 "Create zombies (non-entrant) at exit from the runtime system") \ 823 \ 824 product(bool, UnlinkSymbolsALot, false, \ 825 "Unlink unreferenced symbols from the symbol table at safepoints")\ 826 \ 827 notproduct(bool, WalkStackALot, false, \ 828 "Trace stack (no print) at every exit from the runtime system") \ 829 \ 830 product(bool, Debugging, false, \ 831 "Set when executing debug methods in debug.cpp " \ 832 "(to prevent triggering assertions)") \ 833 \ 834 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 835 "Enable strict checks that safepoints cannot happen for threads " \ 836 "that use NoSafepointVerifier") \ 837 \ 838 notproduct(bool, VerifyLastFrame, false, \ 839 "Verify oops on last frame on entry to VM") \ 840 \ 841 product(bool, FailOverToOldVerifier, true, \ 842 "Fail over to old verifier when split verifier fails") \ 843 \ 844 develop(bool, ShowSafepointMsgs, false, \ 845 "Show message about safepoint synchronization") \ 846 \ 847 product(bool, SafepointTimeout, false, \ 848 "Time out and warn or fail after SafepointTimeoutDelay " \ 849 "milliseconds if failed to reach safepoint") \ 850 \ 851 develop(bool, DieOnSafepointTimeout, false, \ 852 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 853 \ 854 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 855 /* typically, at most a few retries are needed */ \ 856 product(intx, SuspendRetryCount, 50, \ 857 "Maximum retry count for an external suspend request") \ 858 range(0, max_intx) \ 859 \ 860 product(intx, SuspendRetryDelay, 5, \ 861 "Milliseconds to delay per retry (* current_retry_count)") \ 862 range(0, max_intx) \ 863 \ 864 product(bool, AssertOnSuspendWaitFailure, false, \ 865 "Assert/Guarantee on external suspend wait failure") \ 866 \ 867 product(bool, TraceSuspendWaitFailures, false, \ 868 "Trace external suspend wait failures") \ 869 \ 870 product(bool, MaxFDLimit, true, \ 871 "Bump the number of file descriptors to maximum in Solaris") \ 872 \ 873 diagnostic(bool, LogEvents, true, \ 874 "Enable the various ring buffer event logs") \ 875 \ 876 diagnostic(uintx, LogEventsBufferEntries, 10, \ 877 "Number of ring buffer event logs") \ 878 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 879 \ 880 product(bool, BytecodeVerificationRemote, true, \ 881 "Enable the Java bytecode verifier for remote classes") \ 882 \ 883 product(bool, BytecodeVerificationLocal, false, \ 884 "Enable the Java bytecode verifier for local classes") \ 885 \ 886 develop(bool, ForceFloatExceptions, trueInDebug, \ 887 "Force exceptions on FP stack under/overflow") \ 888 \ 889 develop(bool, VerifyStackAtCalls, false, \ 890 "Verify that the stack pointer is unchanged after calls") \ 891 \ 892 develop(bool, TraceJavaAssertions, false, \ 893 "Trace java language assertions") \ 894 \ 895 notproduct(bool, CheckAssertionStatusDirectives, false, \ 896 "Temporary - see javaClasses.cpp") \ 897 \ 898 notproduct(bool, PrintMallocFree, false, \ 899 "Trace calls to C heap malloc/free allocation") \ 900 \ 901 notproduct(bool, VerifyCodeCache, false, \ 902 "Verify code cache on memory allocation/deallocation") \ 903 \ 904 develop(bool, UseMallocOnly, false, \ 905 "Use only malloc/free for allocation (no resource area/arena)") \ 906 \ 907 develop(bool, PrintMalloc, false, \ 908 "Print all malloc/free calls") \ 909 \ 910 develop(bool, PrintMallocStatistics, false, \ 911 "Print malloc/free statistics") \ 912 \ 913 develop(bool, ZapResourceArea, trueInDebug, \ 914 "Zap freed resource/arena space with 0xABABABAB") \ 915 \ 916 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 917 "Zap freed VM handle space with 0xBCBCBCBC") \ 918 \ 919 develop(bool, ZapJNIHandleArea, trueInDebug, \ 920 "Zap freed JNI handle space with 0xFEFEFEFE") \ 921 \ 922 notproduct(bool, ZapStackSegments, trueInDebug, \ 923 "Zap allocated/freed stack segments with 0xFADFADED") \ 924 \ 925 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 926 "Zap unused heap space with 0xBAADBABE") \ 927 \ 928 develop(bool, CheckZapUnusedHeapArea, false, \ 929 "Check zapping of unused heap space") \ 930 \ 931 develop(bool, ZapFillerObjects, trueInDebug, \ 932 "Zap filler objects with 0xDEAFBABE") \ 933 \ 934 develop(bool, PrintVMMessages, true, \ 935 "Print VM messages on console") \ 936 \ 937 notproduct(uintx, ErrorHandlerTest, 0, \ 938 "If > 0, provokes an error after VM initialization; the value " \ 939 "determines which error to provoke. See test_error_handler() " \ 940 "in vmError.cpp.") \ 941 \ 942 notproduct(uintx, TestCrashInErrorHandler, 0, \ 943 "If > 0, provokes an error inside VM error handler (a secondary " \ 944 "crash). see test_error_handler() in vmError.cpp") \ 945 \ 946 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 947 "If true, tests SafeFetch inside error handler.") \ 948 \ 949 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 950 "If true, simulates an unresponsive error handler.") \ 951 \ 952 develop(bool, Verbose, false, \ 953 "Print additional debugging information from other modes") \ 954 \ 955 develop(bool, PrintMiscellaneous, false, \ 956 "Print uncategorized debugging information (requires +Verbose)") \ 957 \ 958 develop(bool, WizardMode, false, \ 959 "Print much more debugging information") \ 960 \ 961 product(bool, ShowMessageBoxOnError, false, \ 962 "Keep process alive on VM fatal error") \ 963 \ 964 product(bool, CreateCoredumpOnCrash, true, \ 965 "Create core/mini dump on VM fatal error") \ 966 \ 967 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 968 "Timeout, in seconds, to limit the time spent on writing an " \ 969 "error log in case of a crash.") \ 970 range(0, (uint64_t)max_jlong/1000) \ 971 \ 972 product_pd(bool, UseOSErrorReporting, \ 973 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 974 \ 975 product(bool, SuppressFatalErrorMessage, false, \ 976 "Report NO fatal error message (avoid deadlock)") \ 977 \ 978 product(ccstrlist, OnError, "", \ 979 "Run user-defined commands on fatal error; see VMError.cpp " \ 980 "for examples") \ 981 \ 982 product(ccstrlist, OnOutOfMemoryError, "", \ 983 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 984 \ 985 manageable(bool, HeapDumpBeforeFullGC, false, \ 986 "Dump heap to file before any major stop-the-world GC") \ 987 \ 988 manageable(bool, HeapDumpAfterFullGC, false, \ 989 "Dump heap to file after any major stop-the-world GC") \ 990 \ 991 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 992 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 993 \ 994 manageable(ccstr, HeapDumpPath, NULL, \ 995 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 996 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 997 "in the working directory)") \ 998 \ 999 develop(bool, BreakAtWarning, false, \ 1000 "Execute breakpoint upon encountering VM warning") \ 1001 \ 1002 develop(bool, UseFakeTimers, false, \ 1003 "Tell whether the VM should use system time or a fake timer") \ 1004 \ 1005 product(ccstr, NativeMemoryTracking, "off", \ 1006 "Native memory tracking options") \ 1007 \ 1008 diagnostic(bool, PrintNMTStatistics, false, \ 1009 "Print native memory tracking summary data if it is on") \ 1010 \ 1011 diagnostic(bool, LogCompilation, false, \ 1012 "Log compilation activity in detail to LogFile") \ 1013 \ 1014 product(bool, PrintCompilation, false, \ 1015 "Print compilations") \ 1016 \ 1017 diagnostic(bool, TraceNMethodInstalls, false, \ 1018 "Trace nmethod installation") \ 1019 \ 1020 diagnostic(intx, ScavengeRootsInCode, 2, \ 1021 "0: do not allow scavengable oops in the code cache; " \ 1022 "1: allow scavenging from the code cache; " \ 1023 "2: emit as many constants as the compiler can see") \ 1024 range(0, 2) \ 1025 \ 1026 product(bool, AlwaysRestoreFPU, false, \ 1027 "Restore the FPU control word after every JNI call (expensive)") \ 1028 \ 1029 diagnostic(bool, PrintCompilation2, false, \ 1030 "Print additional statistics per compilation") \ 1031 \ 1032 diagnostic(bool, PrintAdapterHandlers, false, \ 1033 "Print code generated for i2c/c2i adapters") \ 1034 \ 1035 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1036 "Verify that i2c/c2i adapters are called properly") \ 1037 \ 1038 develop(bool, VerifyAdapterSharing, false, \ 1039 "Verify that the code for shared adapters is the equivalent") \ 1040 \ 1041 diagnostic(bool, PrintAssembly, false, \ 1042 "Print assembly code (using external disassembler.so)") \ 1043 \ 1044 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1045 "Print options string passed to disassembler.so") \ 1046 \ 1047 notproduct(bool, PrintNMethodStatistics, false, \ 1048 "Print a summary statistic for the generated nmethods") \ 1049 \ 1050 diagnostic(bool, PrintNMethods, false, \ 1051 "Print assembly code for nmethods when generated") \ 1052 \ 1053 diagnostic(bool, PrintNativeNMethods, false, \ 1054 "Print assembly code for native nmethods when generated") \ 1055 \ 1056 develop(bool, PrintDebugInfo, false, \ 1057 "Print debug information for all nmethods when generated") \ 1058 \ 1059 develop(bool, PrintRelocations, false, \ 1060 "Print relocation information for all nmethods when generated") \ 1061 \ 1062 develop(bool, PrintDependencies, false, \ 1063 "Print dependency information for all nmethods when generated") \ 1064 \ 1065 develop(bool, PrintExceptionHandlers, false, \ 1066 "Print exception handler tables for all nmethods when generated") \ 1067 \ 1068 develop(bool, StressCompiledExceptionHandlers, false, \ 1069 "Exercise compiled exception handlers") \ 1070 \ 1071 develop(bool, InterceptOSException, false, \ 1072 "Start debugger when an implicit OS (e.g. NULL) " \ 1073 "exception happens") \ 1074 \ 1075 product(bool, PrintCodeCache, false, \ 1076 "Print the code cache memory usage when exiting") \ 1077 \ 1078 develop(bool, PrintCodeCache2, false, \ 1079 "Print detailed usage information on the code cache when exiting")\ 1080 \ 1081 product(bool, PrintCodeCacheOnCompilation, false, \ 1082 "Print the code cache memory usage each time a method is " \ 1083 "compiled") \ 1084 \ 1085 diagnostic(bool, PrintStubCode, false, \ 1086 "Print generated stub code") \ 1087 \ 1088 product(bool, StackTraceInThrowable, true, \ 1089 "Collect backtrace in throwable when exception happens") \ 1090 \ 1091 product(bool, OmitStackTraceInFastThrow, true, \ 1092 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1093 \ 1094 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1095 "Print bytecode statistics when dumping profiler output") \ 1096 \ 1097 product(bool, ProfilerRecordPC, false, \ 1098 "Collect ticks for each 16 byte interval of compiled code") \ 1099 \ 1100 product(bool, ProfileVM, false, \ 1101 "Profile ticks that fall within VM (either in the VM Thread " \ 1102 "or VM code called through stubs)") \ 1103 \ 1104 product(bool, ProfileIntervals, false, \ 1105 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1106 \ 1107 notproduct(bool, ProfilerCheckIntervals, false, \ 1108 "Collect and print information on spacing of profiler ticks") \ 1109 \ 1110 product(bool, PrintWarnings, true, \ 1111 "Print JVM warnings to output stream") \ 1112 \ 1113 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1114 "Print warnings for stalled SpinLocks") \ 1115 \ 1116 product(bool, RegisterFinalizersAtInit, true, \ 1117 "Register finalizable objects at end of Object.<init> or " \ 1118 "after allocation") \ 1119 \ 1120 develop(bool, RegisterReferences, true, \ 1121 "Tell whether the VM should register soft/weak/final/phantom " \ 1122 "references") \ 1123 \ 1124 develop(bool, IgnoreRewrites, false, \ 1125 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1126 "This is unsafe!") \ 1127 \ 1128 develop(bool, PrintCodeCacheExtension, false, \ 1129 "Print extension of code cache") \ 1130 \ 1131 develop(bool, UsePrivilegedStack, true, \ 1132 "Enable the security JVM functions") \ 1133 \ 1134 develop(bool, ProtectionDomainVerification, true, \ 1135 "Verify protection domain before resolution in system dictionary")\ 1136 \ 1137 product(bool, ClassUnloading, true, \ 1138 "Do unloading of classes") \ 1139 \ 1140 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1141 "Do unloading of classes with a concurrent marking cycle") \ 1142 \ 1143 develop(bool, DisableStartThread, false, \ 1144 "Disable starting of additional Java threads " \ 1145 "(for debugging only)") \ 1146 \ 1147 develop(bool, MemProfiling, false, \ 1148 "Write memory usage profiling to log file") \ 1149 \ 1150 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1151 "Print the system dictionary at exit") \ 1152 \ 1153 experimental(intx, PredictedLoadedClassCount, 0, \ 1154 "Experimental: Tune loaded class cache starting size") \ 1155 \ 1156 diagnostic(bool, UnsyncloadClass, false, \ 1157 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1158 "class loader must call VM synchronized for findClass " \ 1159 "and defineClass.") \ 1160 \ 1161 product(bool, AlwaysLockClassLoader, false, \ 1162 "Require the VM to acquire the class loader lock before calling " \ 1163 "loadClass() even for class loaders registering " \ 1164 "as parallel capable") \ 1165 \ 1166 product(bool, AllowParallelDefineClass, false, \ 1167 "Allow parallel defineClass requests for class loaders " \ 1168 "registering as parallel capable") \ 1169 \ 1170 product(bool, MustCallLoadClassInternal, false, \ 1171 "Call loadClassInternal() rather than loadClass()") \ 1172 \ 1173 product_pd(bool, DontYieldALot, \ 1174 "Throw away obvious excess yield calls") \ 1175 \ 1176 develop(bool, UseDetachedThreads, true, \ 1177 "Use detached threads that are recycled upon termination " \ 1178 "(for Solaris only)") \ 1179 \ 1180 product(bool, UseLWPSynchronization, true, \ 1181 "Use LWP-based instead of libthread-based synchronization " \ 1182 "(SPARC only)") \ 1183 \ 1184 experimental(ccstr, SyncKnobs, NULL, \ 1185 "(Unstable) Various monitor synchronization tunables") \ 1186 \ 1187 experimental(intx, EmitSync, 0, \ 1188 "(Unsafe, Unstable) " \ 1189 "Control emission of inline sync fast-path code") \ 1190 \ 1191 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1192 range(0, max_jint) \ 1193 \ 1194 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1195 \ 1196 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 1197 "Percentage of used monitors before triggering cleanup " \ 1198 "safepoint which deflates monitors (0 is off). " \ 1199 "The check is performed on GuaranteedSafepointInterval.") \ 1200 range(0, 100) \ 1201 \ 1202 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1203 "Experimental Sync flags") \ 1204 \ 1205 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1206 \ 1207 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1208 \ 1209 experimental(intx, hashCode, 5, \ 1210 "(Unstable) select hashCode generation algorithm") \ 1211 \ 1212 product(bool, FilterSpuriousWakeups, true, \ 1213 "When true prevents OS-level spurious, or premature, wakeups " \ 1214 "from Object.wait (Ignored for Windows)") \ 1215 \ 1216 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1217 \ 1218 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1219 \ 1220 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1221 \ 1222 develop(bool, UsePthreads, false, \ 1223 "Use pthread-based instead of libthread-based synchronization " \ 1224 "(SPARC only)") \ 1225 \ 1226 product(bool, ReduceSignalUsage, false, \ 1227 "Reduce the use of OS signals in Java and/or the VM") \ 1228 \ 1229 develop_pd(bool, ShareVtableStubs, \ 1230 "Share vtable stubs (smaller code but worse branch prediction") \ 1231 \ 1232 develop(bool, LoadLineNumberTables, true, \ 1233 "Tell whether the class file parser loads line number tables") \ 1234 \ 1235 develop(bool, LoadLocalVariableTables, true, \ 1236 "Tell whether the class file parser loads local variable tables") \ 1237 \ 1238 develop(bool, LoadLocalVariableTypeTables, true, \ 1239 "Tell whether the class file parser loads local variable type" \ 1240 "tables") \ 1241 \ 1242 product(bool, AllowUserSignalHandlers, false, \ 1243 "Do not complain if the application installs signal handlers " \ 1244 "(Solaris & Linux only)") \ 1245 \ 1246 product(bool, UseSignalChaining, true, \ 1247 "Use signal-chaining to invoke signal handlers installed " \ 1248 "by the application (Solaris & Linux only)") \ 1249 \ 1250 product(bool, AllowJNIEnvProxy, false, \ 1251 "Allow JNIEnv proxies for jdbx") \ 1252 \ 1253 product(bool, RestoreMXCSROnJNICalls, false, \ 1254 "Restore MXCSR when returning from JNI calls") \ 1255 \ 1256 product(bool, CheckJNICalls, false, \ 1257 "Verify all arguments to JNI calls") \ 1258 \ 1259 product(bool, CheckEndorsedAndExtDirs, false, \ 1260 "Verify the endorsed and extension directories are not used") \ 1261 \ 1262 product(bool, UseFastJNIAccessors, true, \ 1263 "Use optimized versions of Get<Primitive>Field") \ 1264 \ 1265 product(intx, MaxJNILocalCapacity, 65536, \ 1266 "Maximum allowable local JNI handle capacity to " \ 1267 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1268 "where <= 0 is unlimited, default: 65536") \ 1269 range(min_intx, max_intx) \ 1270 \ 1271 product(bool, EagerXrunInit, false, \ 1272 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1273 "but not all -Xrun libraries may support the state of the VM " \ 1274 "at this time") \ 1275 \ 1276 product(bool, PreserveAllAnnotations, false, \ 1277 "Preserve RuntimeInvisibleAnnotations as well " \ 1278 "as RuntimeVisibleAnnotations") \ 1279 \ 1280 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1281 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1282 \ 1283 product(bool, UseXMMForArrayCopy, false, \ 1284 "Use SSE2 MOVQ instruction for Arraycopy") \ 1285 \ 1286 product(intx, FieldsAllocationStyle, 1, \ 1287 "0 - type based with oops first, " \ 1288 "1 - with oops last, " \ 1289 "2 - oops in super and sub classes are together") \ 1290 range(0, 2) \ 1291 \ 1292 product(bool, CompactFields, true, \ 1293 "Allocate nonstatic fields in gaps between previous fields") \ 1294 \ 1295 notproduct(bool, PrintFieldLayout, false, \ 1296 "Print field layout for each class") \ 1297 \ 1298 notproduct(bool, PrintValueLayout, false, \ 1299 "Print field layout for each value type") \ 1300 \ 1301 notproduct(bool, PrintValueArrayLayout, false, \ 1302 "Print array layout for each value type array") \ 1303 \ 1304 product(bool, ValueArrayFlatten, true, \ 1305 "Flatten value array elements, if possible") \ 1306 \ 1307 product(intx, ValueArrayElemMaxFlatSize, -1, \ 1308 "Max size for flattening value array elements, <0 no limit") \ 1309 \ 1310 product(intx, ValueArrayElemMaxFlatOops, 4, \ 1311 "Max nof embedded object references in a value type to flatten, <0 no limit") \ 1312 \ 1313 product(bool, ValueArrayAtomicAccess, false, \ 1314 "Atomic value array accesses by-default, for all value arrays") \ 1315 \ 1316 /* Need to limit the extent of the padding to reasonable size. */\ 1317 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1318 /* aggressive prefetching, while still leaving the room for segregating */\ 1319 /* among the distinct pages. */\ 1320 product(intx, ContendedPaddingWidth, 128, \ 1321 "How many bytes to pad the fields/classes marked @Contended with")\ 1322 range(0, 8192) \ 1323 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1324 \ 1325 product(bool, EnableContended, true, \ 1326 "Enable @Contended annotation support") \ 1327 \ 1328 product(bool, RestrictContended, true, \ 1329 "Restrict @Contended to trusted classes") \ 1330 \ 1331 product(bool, UseBiasedLocking, true, \ 1332 "Enable biased locking in JVM") \ 1333 \ 1334 product(intx, BiasedLockingStartupDelay, 0, \ 1335 "Number of milliseconds to wait before enabling biased locking") \ 1336 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1337 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1338 \ 1339 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1340 "Print statistics of biased locking in JVM") \ 1341 \ 1342 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1343 "Threshold of number of revocations per type to try to " \ 1344 "rebias all objects in the heap of that type") \ 1345 range(0, max_intx) \ 1346 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1347 \ 1348 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1349 "Threshold of number of revocations per type to permanently " \ 1350 "revoke biases of all objects in the heap of that type") \ 1351 range(0, max_intx) \ 1352 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1353 \ 1354 product(intx, BiasedLockingDecayTime, 25000, \ 1355 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1356 "type after previous bulk rebias") \ 1357 range(500, max_intx) \ 1358 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1359 \ 1360 product(bool, ExitOnOutOfMemoryError, false, \ 1361 "JVM exits on the first occurrence of an out-of-memory error") \ 1362 \ 1363 product(bool, CrashOnOutOfMemoryError, false, \ 1364 "JVM aborts, producing an error log and core/mini dump, on the " \ 1365 "first occurrence of an out-of-memory error") \ 1366 \ 1367 /* tracing */ \ 1368 \ 1369 develop(bool, StressRewriter, false, \ 1370 "Stress linktime bytecode rewriting") \ 1371 \ 1372 product(ccstr, TraceJVMTI, NULL, \ 1373 "Trace flags for JVMTI functions and events") \ 1374 \ 1375 /* This option can change an EMCP method into an obsolete method. */ \ 1376 /* This can affect tests that except specific methods to be EMCP. */ \ 1377 /* This option should be used with caution. */ \ 1378 product(bool, StressLdcRewrite, false, \ 1379 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1380 \ 1381 /* change to false by default sometime after Mustang */ \ 1382 product(bool, VerifyMergedCPBytecodes, true, \ 1383 "Verify bytecodes after RedefineClasses constant pool merging") \ 1384 \ 1385 develop(bool, TraceBytecodes, false, \ 1386 "Trace bytecode execution") \ 1387 \ 1388 develop(bool, TraceICs, false, \ 1389 "Trace inline cache changes") \ 1390 \ 1391 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1392 "Trace method invocation counter overflow") \ 1393 \ 1394 develop(bool, TraceInlineCacheClearing, false, \ 1395 "Trace clearing of inline caches in nmethods") \ 1396 \ 1397 develop(bool, TraceDependencies, false, \ 1398 "Trace dependencies") \ 1399 \ 1400 develop(bool, VerifyDependencies, trueInDebug, \ 1401 "Exercise and verify the compilation dependency mechanism") \ 1402 \ 1403 develop(bool, TraceNewOopMapGeneration, false, \ 1404 "Trace OopMapGeneration") \ 1405 \ 1406 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1407 "Trace OopMapGeneration: print detailed cell states") \ 1408 \ 1409 develop(bool, TimeOopMap, false, \ 1410 "Time calls to GenerateOopMap::compute_map() in sum") \ 1411 \ 1412 develop(bool, TimeOopMap2, false, \ 1413 "Time calls to GenerateOopMap::compute_map() individually") \ 1414 \ 1415 develop(bool, TraceOopMapRewrites, false, \ 1416 "Trace rewriting of method oops during oop map generation") \ 1417 \ 1418 develop(bool, TraceICBuffer, false, \ 1419 "Trace usage of IC buffer") \ 1420 \ 1421 develop(bool, TraceCompiledIC, false, \ 1422 "Trace changes of compiled IC") \ 1423 \ 1424 /* gc */ \ 1425 \ 1426 product(bool, UseSerialGC, false, \ 1427 "Use the Serial garbage collector") \ 1428 \ 1429 product(bool, UseG1GC, false, \ 1430 "Use the Garbage-First garbage collector") \ 1431 \ 1432 product(bool, UseParallelGC, false, \ 1433 "Use the Parallel Scavenge garbage collector") \ 1434 \ 1435 product(bool, UseParallelOldGC, false, \ 1436 "Use the Parallel Old garbage collector") \ 1437 \ 1438 product(uintx, HeapMaximumCompactionInterval, 20, \ 1439 "How often should we maximally compact the heap (not allowing " \ 1440 "any dead space)") \ 1441 range(0, max_uintx) \ 1442 \ 1443 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1444 "The collection count for the first maximum compaction") \ 1445 range(0, max_uintx) \ 1446 \ 1447 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1448 "Use maximum compaction in the Parallel Old garbage collector " \ 1449 "for a system GC") \ 1450 \ 1451 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1452 "The mean used by the parallel compact dead wood " \ 1453 "limiter (a number between 0-100)") \ 1454 range(0, 100) \ 1455 \ 1456 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1457 "The standard deviation used by the parallel compact dead wood " \ 1458 "limiter (a number between 0-100)") \ 1459 range(0, 100) \ 1460 \ 1461 product(uint, ParallelGCThreads, 0, \ 1462 "Number of parallel threads parallel gc will use") \ 1463 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1464 \ 1465 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1466 "Use semaphore synchronization for the GC Threads, " \ 1467 "instead of synchronization based on mutexes") \ 1468 \ 1469 product(bool, UseDynamicNumberOfGCThreads, false, \ 1470 "Dynamically choose the number of parallel threads " \ 1471 "parallel gc will use") \ 1472 \ 1473 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1474 "Inject thread creation failures for " \ 1475 "UseDynamicNumberOfGCThreads") \ 1476 \ 1477 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1478 "Force dynamic selection of the number of " \ 1479 "parallel threads parallel gc will use to aid debugging") \ 1480 \ 1481 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1482 "Size of heap (bytes) per GC thread used in calculating the " \ 1483 "number of GC threads") \ 1484 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1485 \ 1486 product(uint, ConcGCThreads, 0, \ 1487 "Number of threads concurrent gc will use") \ 1488 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1489 \ 1490 product(uint, GCTaskTimeStampEntries, 200, \ 1491 "Number of time stamp entries per gc worker thread") \ 1492 range(1, max_jint) \ 1493 \ 1494 product(bool, AlwaysTenure, false, \ 1495 "Always tenure objects in eden (ParallelGC only)") \ 1496 \ 1497 product(bool, NeverTenure, false, \ 1498 "Never tenure objects in eden, may tenure on overflow " \ 1499 "(ParallelGC only)") \ 1500 \ 1501 product(bool, ScavengeBeforeFullGC, true, \ 1502 "Scavenge youngest generation before each full GC.") \ 1503 \ 1504 product(bool, UseConcMarkSweepGC, false, \ 1505 "Use Concurrent Mark-Sweep GC in the old generation") \ 1506 \ 1507 product(bool, ExplicitGCInvokesConcurrent, false, \ 1508 "A System.gc() request invokes a concurrent collection; " \ 1509 "(effective only when using concurrent collectors)") \ 1510 \ 1511 product(bool, GCLockerInvokesConcurrent, false, \ 1512 "The exit of a JNI critical section necessitating a scavenge, " \ 1513 "also kicks off a background concurrent collection") \ 1514 \ 1515 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1516 "How much the GC can expand the eden by while the GC locker " \ 1517 "is active (as a percentage)") \ 1518 range(0, 100) \ 1519 \ 1520 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1521 "Number of times to retry allocations when " \ 1522 "blocked by the GC locker") \ 1523 range(0, max_uintx) \ 1524 \ 1525 product(bool, UseCMSBestFit, true, \ 1526 "Use CMS best fit allocation strategy") \ 1527 \ 1528 product(uintx, ParallelGCBufferWastePct, 10, \ 1529 "Wasted fraction of parallel allocation buffer") \ 1530 range(0, 100) \ 1531 \ 1532 product(uintx, TargetPLABWastePct, 10, \ 1533 "Target wasted space in last buffer as percent of overall " \ 1534 "allocation") \ 1535 range(1, 100) \ 1536 \ 1537 product(uintx, PLABWeight, 75, \ 1538 "Percentage (0-100) used to weight the current sample when " \ 1539 "computing exponentially decaying average for ResizePLAB") \ 1540 range(0, 100) \ 1541 \ 1542 product(bool, ResizePLAB, true, \ 1543 "Dynamically resize (survivor space) promotion LAB's") \ 1544 \ 1545 product(int, ParGCArrayScanChunk, 50, \ 1546 "Scan a subset of object array and push remainder, if array is " \ 1547 "bigger than this") \ 1548 range(1, max_jint/3) \ 1549 \ 1550 product(bool, ParGCUseLocalOverflow, false, \ 1551 "Instead of a global overflow list, use local overflow stacks") \ 1552 \ 1553 product(bool, ParGCTrimOverflow, true, \ 1554 "Eagerly trim the local overflow lists " \ 1555 "(when ParGCUseLocalOverflow)") \ 1556 \ 1557 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1558 "Simulate work queue overflow in ParNew") \ 1559 \ 1560 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1561 "An `interval' counter that determines how frequently " \ 1562 "we simulate overflow; a smaller number increases frequency") \ 1563 \ 1564 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1565 "The desired number of objects to claim from the overflow list") \ 1566 range(0, max_uintx) \ 1567 \ 1568 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1569 "The number of strides per worker thread that we divide up the " \ 1570 "card table scanning work into") \ 1571 range(1, max_uintx) \ 1572 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1573 \ 1574 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1575 "The number of cards in each chunk of the parallel chunks used " \ 1576 "during card table scanning") \ 1577 range(1, max_intx) \ 1578 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1579 \ 1580 product(uintx, OldPLABWeight, 50, \ 1581 "Percentage (0-100) used to weight the current sample when " \ 1582 "computing exponentially decaying average for resizing " \ 1583 "OldPLABSize") \ 1584 range(0, 100) \ 1585 \ 1586 product(bool, ResizeOldPLAB, true, \ 1587 "Dynamically resize (old gen) promotion LAB's") \ 1588 \ 1589 product(size_t, CMSOldPLABMax, 1024, \ 1590 "Maximum size of CMS gen promotion LAB caches per worker " \ 1591 "per block size") \ 1592 range(1, max_uintx) \ 1593 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1594 \ 1595 product(size_t, CMSOldPLABMin, 16, \ 1596 "Minimum size of CMS gen promotion LAB caches per worker " \ 1597 "per block size") \ 1598 range(1, max_uintx) \ 1599 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1600 \ 1601 product(uintx, CMSOldPLABNumRefills, 4, \ 1602 "Nominal number of refills of CMS gen promotion LAB cache " \ 1603 "per worker per block size") \ 1604 range(1, max_uintx) \ 1605 \ 1606 product(bool, CMSOldPLABResizeQuicker, false, \ 1607 "React on-the-fly during a scavenge to a sudden " \ 1608 "change in block demand rate") \ 1609 \ 1610 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1611 "The tolerance of the phase-change detector for on-the-fly " \ 1612 "PLAB resizing during a scavenge") \ 1613 range(1, max_uintx) \ 1614 \ 1615 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1616 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1617 "during a scavenge") \ 1618 range(1, max_uintx) \ 1619 \ 1620 product(bool, AlwaysPreTouch, false, \ 1621 "Force all freshly committed pages to be pre-touched") \ 1622 \ 1623 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1624 "Per-thread chunk size for parallel memory pre-touch.") \ 1625 range(1, SIZE_MAX / 2) \ 1626 \ 1627 product_pd(size_t, CMSYoungGenPerWorker, \ 1628 "The maximum size of young gen chosen by default per GC worker " \ 1629 "thread available") \ 1630 range(1, max_uintx) \ 1631 \ 1632 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1633 "Percentage (0-100) used to add conservatism when computing the " \ 1634 "duty cycle") \ 1635 range(0, 100) \ 1636 \ 1637 product(uintx, CMSExpAvgFactor, 50, \ 1638 "Percentage (0-100) used to weight the current sample when " \ 1639 "computing exponential averages for CMS statistics") \ 1640 range(0, 100) \ 1641 \ 1642 product(uintx, CMS_FLSWeight, 75, \ 1643 "Percentage (0-100) used to weight the current sample when " \ 1644 "computing exponentially decaying averages for CMS FLS " \ 1645 "statistics") \ 1646 range(0, 100) \ 1647 \ 1648 product(uintx, CMS_FLSPadding, 1, \ 1649 "The multiple of deviation from mean to use for buffering " \ 1650 "against volatility in free list demand") \ 1651 range(0, max_juint) \ 1652 \ 1653 product(uintx, FLSCoalescePolicy, 2, \ 1654 "CMS: aggressiveness level for coalescing, increasing " \ 1655 "from 0 to 4") \ 1656 range(0, 4) \ 1657 \ 1658 product(bool, FLSAlwaysCoalesceLarge, false, \ 1659 "CMS: larger free blocks are always available for coalescing") \ 1660 \ 1661 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1662 "CMS: the smaller the percentage the greater the coalescing " \ 1663 "force") \ 1664 range(0.0, 1.0) \ 1665 \ 1666 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1667 "CMS: the factor by which to inflate estimated demand of small " \ 1668 "block sizes to prevent coalescing with an adjoining block") \ 1669 range(0.0, DBL_MAX) \ 1670 \ 1671 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1672 "CMS: the factor by which to inflate estimated demand of large " \ 1673 "block sizes to prevent coalescing with an adjoining block") \ 1674 range(0.0, DBL_MAX) \ 1675 \ 1676 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1677 "CMS: the factor by which to inflate estimated demand of small " \ 1678 "block sizes to prevent splitting to supply demand for smaller " \ 1679 "blocks") \ 1680 range(0.0, DBL_MAX) \ 1681 \ 1682 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1683 "CMS: the factor by which to inflate estimated demand of large " \ 1684 "block sizes to prevent splitting to supply demand for smaller " \ 1685 "blocks") \ 1686 range(0.0, DBL_MAX) \ 1687 \ 1688 product(bool, CMSExtrapolateSweep, false, \ 1689 "CMS: cushion for block demand during sweep") \ 1690 \ 1691 product(uintx, CMS_SweepWeight, 75, \ 1692 "Percentage (0-100) used to weight the current sample when " \ 1693 "computing exponentially decaying average for inter-sweep " \ 1694 "duration") \ 1695 range(0, 100) \ 1696 \ 1697 product(uintx, CMS_SweepPadding, 1, \ 1698 "The multiple of deviation from mean to use for buffering " \ 1699 "against volatility in inter-sweep duration") \ 1700 range(0, max_juint) \ 1701 \ 1702 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1703 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1704 "duration exceeds this threshold in milliseconds") \ 1705 range(0, max_uintx) \ 1706 \ 1707 product(bool, CMSClassUnloadingEnabled, true, \ 1708 "Whether class unloading enabled when using CMS GC") \ 1709 \ 1710 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1711 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1712 "count for which classes may not be unloaded") \ 1713 range(0, max_uintx) \ 1714 \ 1715 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1716 "Replenish an indexed free list with this number of chunks") \ 1717 range(1, max_uintx) \ 1718 \ 1719 product(bool, CMSReplenishIntermediate, true, \ 1720 "Replenish all intermediate free-list caches") \ 1721 \ 1722 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1723 "When satisfying batched demand, split blocks from the " \ 1724 "IndexedFreeList whose size is a multiple of requested size") \ 1725 \ 1726 product(bool, CMSLoopWarn, false, \ 1727 "Warn in case of excessive CMS looping") \ 1728 \ 1729 /* where does the range max value of (max_jint - 1) come from? */ \ 1730 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1731 "Maximum size of marking stack") \ 1732 range(1, (max_jint - 1)) \ 1733 \ 1734 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1735 "Size of marking stack") \ 1736 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1737 \ 1738 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1739 "Simulate frequent marking stack / work queue overflow") \ 1740 \ 1741 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1742 "An \"interval\" counter that determines how frequently " \ 1743 "to simulate overflow; a smaller number increases frequency") \ 1744 \ 1745 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1746 "Maximum number of abortable preclean iterations, if > 0") \ 1747 range(0, max_uintx) \ 1748 \ 1749 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1750 "Maximum time in abortable preclean (in milliseconds)") \ 1751 range(0, max_intx) \ 1752 \ 1753 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1754 "Nominal minimum work per abortable preclean iteration") \ 1755 range(0, max_uintx) \ 1756 \ 1757 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1758 "Time that we sleep between iterations when not given " \ 1759 "enough work per iteration") \ 1760 range(0, max_intx) \ 1761 \ 1762 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1763 product(size_t, CMSRescanMultiple, 32, \ 1764 "Size (in cards) of CMS parallel rescan task") \ 1765 range(1, SIZE_MAX / 4096) \ 1766 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1767 \ 1768 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1769 product(size_t, CMSConcMarkMultiple, 32, \ 1770 "Size (in cards) of CMS concurrent MT marking task") \ 1771 range(1, SIZE_MAX / 4096) \ 1772 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1773 \ 1774 product(bool, CMSAbortSemantics, false, \ 1775 "Whether abort-on-overflow semantics is implemented") \ 1776 \ 1777 product(bool, CMSParallelInitialMarkEnabled, true, \ 1778 "Use the parallel initial mark.") \ 1779 \ 1780 product(bool, CMSParallelRemarkEnabled, true, \ 1781 "Whether parallel remark enabled (only if ParNewGC)") \ 1782 \ 1783 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1784 "Whether parallel remark of survivor space " \ 1785 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1786 \ 1787 product(bool, CMSPLABRecordAlways, true, \ 1788 "Always record survivor space PLAB boundaries (effective only " \ 1789 "if CMSParallelSurvivorRemarkEnabled)") \ 1790 \ 1791 product(bool, CMSEdenChunksRecordAlways, true, \ 1792 "Always record eden chunks used for the parallel initial mark " \ 1793 "or remark of eden") \ 1794 \ 1795 product(bool, CMSConcurrentMTEnabled, true, \ 1796 "Whether multi-threaded concurrent work enabled " \ 1797 "(effective only if ParNewGC)") \ 1798 \ 1799 product(bool, CMSPrecleaningEnabled, true, \ 1800 "Whether concurrent precleaning enabled") \ 1801 \ 1802 product(uintx, CMSPrecleanIter, 3, \ 1803 "Maximum number of precleaning iteration passes") \ 1804 range(0, 9) \ 1805 \ 1806 product(uintx, CMSPrecleanDenominator, 3, \ 1807 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1808 "ratio") \ 1809 range(1, max_uintx) \ 1810 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1811 \ 1812 product(uintx, CMSPrecleanNumerator, 2, \ 1813 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1814 "ratio") \ 1815 range(0, max_uintx-1) \ 1816 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1817 \ 1818 product(bool, CMSPrecleanRefLists1, true, \ 1819 "Preclean ref lists during (initial) preclean phase") \ 1820 \ 1821 product(bool, CMSPrecleanRefLists2, false, \ 1822 "Preclean ref lists during abortable preclean phase") \ 1823 \ 1824 product(bool, CMSPrecleanSurvivors1, false, \ 1825 "Preclean survivors during (initial) preclean phase") \ 1826 \ 1827 product(bool, CMSPrecleanSurvivors2, true, \ 1828 "Preclean survivors during abortable preclean phase") \ 1829 \ 1830 product(uintx, CMSPrecleanThreshold, 1000, \ 1831 "Do not iterate again if number of dirty cards is less than this")\ 1832 range(100, max_uintx) \ 1833 \ 1834 product(bool, CMSCleanOnEnter, true, \ 1835 "Clean-on-enter optimization for reducing number of dirty cards") \ 1836 \ 1837 product(uintx, CMSRemarkVerifyVariant, 1, \ 1838 "Choose variant (1,2) of verification following remark") \ 1839 range(1, 2) \ 1840 \ 1841 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1842 "If Eden size is below this, do not try to schedule remark") \ 1843 range(0, max_uintx) \ 1844 \ 1845 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1846 "The Eden occupancy percentage (0-100) at which " \ 1847 "to try and schedule remark pause") \ 1848 range(0, 100) \ 1849 \ 1850 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1851 "Start sampling eden top at least before young gen " \ 1852 "occupancy reaches 1/<ratio> of the size at which " \ 1853 "we plan to schedule remark") \ 1854 range(1, max_uintx) \ 1855 \ 1856 product(uintx, CMSSamplingGrain, 16*K, \ 1857 "The minimum distance between eden samples for CMS (see above)") \ 1858 range(ObjectAlignmentInBytes, max_uintx) \ 1859 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1860 \ 1861 product(bool, CMSScavengeBeforeRemark, false, \ 1862 "Attempt scavenge before the CMS remark step") \ 1863 \ 1864 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1865 "Don't drain below this size per parallel worker/thief") \ 1866 range(1, max_juint) \ 1867 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1868 \ 1869 manageable(intx, CMSWaitDuration, 2000, \ 1870 "Time in milliseconds that CMS thread waits for young GC") \ 1871 range(min_jint, max_jint) \ 1872 \ 1873 develop(uintx, CMSCheckInterval, 1000, \ 1874 "Interval in milliseconds that CMS thread checks if it " \ 1875 "should start a collection cycle") \ 1876 \ 1877 product(bool, CMSYield, true, \ 1878 "Yield between steps of CMS") \ 1879 \ 1880 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1881 "Bitmap operations should process at most this many bits " \ 1882 "between yields") \ 1883 range(1, max_uintx) \ 1884 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1885 \ 1886 product(bool, CMSPrintChunksInDump, false, \ 1887 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1888 "trace level include more detailed information about the" \ 1889 "free chunks") \ 1890 \ 1891 product(bool, CMSPrintObjectsInDump, false, \ 1892 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1893 "trace level include more detailed information about the" \ 1894 "allocated objects") \ 1895 \ 1896 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1897 "Verify that all references across the FLS boundary " \ 1898 "are to valid objects") \ 1899 \ 1900 diagnostic(bool, FLSVerifyLists, false, \ 1901 "Do lots of (expensive) FreeListSpace verification") \ 1902 \ 1903 diagnostic(bool, FLSVerifyIndexTable, false, \ 1904 "Do lots of (expensive) FLS index table verification") \ 1905 \ 1906 develop(bool, FLSVerifyDictionary, false, \ 1907 "Do lots of (expensive) FLS dictionary verification") \ 1908 \ 1909 develop(bool, VerifyBlockOffsetArray, false, \ 1910 "Do (expensive) block offset array verification") \ 1911 \ 1912 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1913 "Maintain _unallocated_block in BlockOffsetArray " \ 1914 "(currently applicable only to CMS collector)") \ 1915 \ 1916 product(intx, RefDiscoveryPolicy, 0, \ 1917 "Select type of reference discovery policy: " \ 1918 "reference-based(0) or referent-based(1)") \ 1919 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1920 ReferenceProcessor::DiscoveryPolicyMax) \ 1921 \ 1922 product(bool, ParallelRefProcEnabled, false, \ 1923 "Enable parallel reference processing whenever possible") \ 1924 \ 1925 product(bool, ParallelRefProcBalancingEnabled, true, \ 1926 "Enable balancing of reference processing queues") \ 1927 \ 1928 product(uintx, CMSTriggerRatio, 80, \ 1929 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1930 "allocated before a CMS collection cycle commences") \ 1931 range(0, 100) \ 1932 \ 1933 product(uintx, CMSBootstrapOccupancy, 50, \ 1934 "Percentage CMS generation occupancy at which to " \ 1935 "initiate CMS collection for bootstrapping collection stats") \ 1936 range(0, 100) \ 1937 \ 1938 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1939 "Percentage CMS generation occupancy to start a CMS collection " \ 1940 "cycle. A negative value means that CMSTriggerRatio is used") \ 1941 range(min_intx, 100) \ 1942 \ 1943 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1944 "The percent occupancy (IHOP) of the current old generation " \ 1945 "capacity above which a concurrent mark cycle will be initiated " \ 1946 "Its value may change over time if adaptive IHOP is enabled, " \ 1947 "otherwise the value remains constant. " \ 1948 "In the latter case a value of 0 will result as frequent as " \ 1949 "possible concurrent marking cycles. A value of 100 disables " \ 1950 "concurrent marking. " \ 1951 "Fragmentation waste in the old generation is not considered " \ 1952 "free space in this calculation. (G1 collector only)") \ 1953 range(0, 100) \ 1954 \ 1955 manageable(intx, CMSTriggerInterval, -1, \ 1956 "Commence a CMS collection cycle (at least) every so many " \ 1957 "milliseconds (0 permanently, -1 disabled)") \ 1958 range(-1, max_intx) \ 1959 \ 1960 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1961 "Only use occupancy as a criterion for starting a CMS collection")\ 1962 \ 1963 product(uintx, CMSIsTooFullPercentage, 98, \ 1964 "An absolute ceiling above which CMS will always consider the " \ 1965 "unloading of classes when class unloading is enabled") \ 1966 range(0, 100) \ 1967 \ 1968 develop(bool, CMSTestInFreeList, false, \ 1969 "Check if the coalesced range is already in the " \ 1970 "free lists as claimed") \ 1971 \ 1972 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1973 "Check that all the garbage collected was returned to the " \ 1974 "free lists") \ 1975 \ 1976 notproduct(bool, ScavengeALot, false, \ 1977 "Force scavenge at every Nth exit from the runtime system " \ 1978 "(N=ScavengeALotInterval)") \ 1979 \ 1980 develop(bool, FullGCALot, false, \ 1981 "Force full gc at every Nth exit from the runtime system " \ 1982 "(N=FullGCALotInterval)") \ 1983 \ 1984 notproduct(bool, GCALotAtAllSafepoints, false, \ 1985 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1986 \ 1987 notproduct(bool, PromotionFailureALot, false, \ 1988 "Use promotion failure handling on every youngest generation " \ 1989 "collection") \ 1990 \ 1991 develop(uintx, PromotionFailureALotCount, 1000, \ 1992 "Number of promotion failures occurring at PLAB " \ 1993 "refill attempts (ParNew) or promotion attempts " \ 1994 "(other young collectors)") \ 1995 \ 1996 develop(uintx, PromotionFailureALotInterval, 5, \ 1997 "Total collections between promotion failures a lot") \ 1998 \ 1999 experimental(uintx, WorkStealingSleepMillis, 1, \ 2000 "Sleep time when sleep is used for yields") \ 2001 \ 2002 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2003 "Number of yields before a sleep is done during work stealing") \ 2004 \ 2005 experimental(uintx, WorkStealingHardSpins, 4096, \ 2006 "Number of iterations in a spin loop between checks on " \ 2007 "time out of hard spin") \ 2008 \ 2009 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2010 "Ratio of hard spins to calls to yield") \ 2011 \ 2012 develop(uintx, ObjArrayMarkingStride, 2048, \ 2013 "Number of object array elements to push onto the marking stack " \ 2014 "before pushing a continuation entry") \ 2015 \ 2016 develop(bool, MetadataAllocationFailALot, false, \ 2017 "Fail metadata allocations at intervals controlled by " \ 2018 "MetadataAllocationFailALotInterval") \ 2019 \ 2020 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2021 "Metadata allocation failure a lot interval") \ 2022 \ 2023 notproduct(bool, ExecuteInternalVMTests, false, \ 2024 "Enable execution of internal VM tests") \ 2025 \ 2026 notproduct(bool, VerboseInternalVMTests, false, \ 2027 "Turn on logging for internal VM tests.") \ 2028 \ 2029 product(bool, ExecutingUnitTests, false, \ 2030 "Whether the JVM is running unit tests or not") \ 2031 \ 2032 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2033 \ 2034 product_pd(bool, ResizeTLAB, \ 2035 "Dynamically resize TLAB size for threads") \ 2036 \ 2037 product(bool, ZeroTLAB, false, \ 2038 "Zero out the newly created TLAB") \ 2039 \ 2040 product(bool, FastTLABRefill, true, \ 2041 "Use fast TLAB refill code") \ 2042 \ 2043 product(bool, TLABStats, true, \ 2044 "Provide more detailed and expensive TLAB statistics.") \ 2045 \ 2046 product_pd(bool, NeverActAsServerClassMachine, \ 2047 "Never act like a server-class machine") \ 2048 \ 2049 product(bool, AlwaysActAsServerClassMachine, false, \ 2050 "Always act like a server-class machine") \ 2051 \ 2052 product_pd(uint64_t, MaxRAM, \ 2053 "Real memory size (in bytes) used to set maximum heap size") \ 2054 range(0, 0XFFFFFFFFFFFFFFFF) \ 2055 \ 2056 product(size_t, ErgoHeapSizeLimit, 0, \ 2057 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2058 "MaxRAM * MaxRAMPercentage / 100") \ 2059 range(0, max_uintx) \ 2060 \ 2061 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2062 "Use CGroup memory limit as physical memory limit for heap " \ 2063 "sizing") \ 2064 \ 2065 product(uintx, MaxRAMFraction, 4, \ 2066 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2067 "size. " \ 2068 "Deprecated, use MaxRAMPercentage instead") \ 2069 range(1, max_uintx) \ 2070 \ 2071 product(uintx, MinRAMFraction, 2, \ 2072 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2073 "size on systems with small physical memory size. " \ 2074 "Deprecated, use MinRAMPercentage instead") \ 2075 range(1, max_uintx) \ 2076 \ 2077 product(uintx, InitialRAMFraction, 64, \ 2078 "Fraction (1/n) of real memory used for initial heap size. " \ 2079 "Deprecated, use InitialRAMPercentage instead") \ 2080 range(1, max_uintx) \ 2081 \ 2082 product(double, MaxRAMPercentage, 25.0, \ 2083 "Maximum percentage of real memory used for maximum heap size") \ 2084 range(0.0, 100.0) \ 2085 \ 2086 product(double, MinRAMPercentage, 50.0, \ 2087 "Minimum percentage of real memory used for maximum heap" \ 2088 "size on systems with small physical memory size") \ 2089 range(0.0, 100.0) \ 2090 \ 2091 product(double, InitialRAMPercentage, 1.5625, \ 2092 "Percentage of real memory used for initial heap size") \ 2093 range(0.0, 100.0) \ 2094 \ 2095 develop(uintx, MaxVirtMemFraction, 2, \ 2096 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2097 "determining maximum heap size") \ 2098 \ 2099 product(bool, UseAdaptiveSizePolicy, true, \ 2100 "Use adaptive generation sizing policies") \ 2101 \ 2102 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2103 "Use adaptive survivor sizing policies") \ 2104 \ 2105 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2106 "Use adaptive young-old sizing policies at minor collections") \ 2107 \ 2108 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2109 "Use adaptive young-old sizing policies at major collections") \ 2110 \ 2111 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2112 "Include statistics from System.gc() for adaptive size policy") \ 2113 \ 2114 product(bool, UseAdaptiveGCBoundary, false, \ 2115 "Allow young-old boundary to move") \ 2116 \ 2117 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2118 "Resize the virtual spaces of the young or old generations") \ 2119 range(-1, 1) \ 2120 \ 2121 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2122 "Policy for changing generation size for throughput goals") \ 2123 range(0, 1) \ 2124 \ 2125 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2126 "Number of steps where heuristics is used before data is used") \ 2127 range(0, max_uintx) \ 2128 \ 2129 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2130 "Number of collections before the adaptive sizing is started") \ 2131 \ 2132 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2133 "Collection interval for printing information; zero means never") \ 2134 range(0, max_uintx) \ 2135 \ 2136 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2137 "Use adaptive minimum footprint as a goal") \ 2138 \ 2139 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2140 "Weight given to exponential resizing, between 0 and 100") \ 2141 range(0, 100) \ 2142 \ 2143 product(uintx, AdaptiveTimeWeight, 25, \ 2144 "Weight given to time in adaptive policy, between 0 and 100") \ 2145 range(0, 100) \ 2146 \ 2147 product(uintx, PausePadding, 1, \ 2148 "How much buffer to keep for pause time") \ 2149 range(0, max_juint) \ 2150 \ 2151 product(uintx, PromotedPadding, 3, \ 2152 "How much buffer to keep for promotion failure") \ 2153 range(0, max_juint) \ 2154 \ 2155 product(uintx, SurvivorPadding, 3, \ 2156 "How much buffer to keep for survivor overflow") \ 2157 range(0, max_juint) \ 2158 \ 2159 product(uintx, ThresholdTolerance, 10, \ 2160 "Allowed collection cost difference between generations") \ 2161 range(0, 100) \ 2162 \ 2163 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2164 "If collection costs are within margin, reduce both by full " \ 2165 "delta") \ 2166 range(0, 100) \ 2167 \ 2168 product(uintx, YoungGenerationSizeIncrement, 20, \ 2169 "Adaptive size percentage change in young generation") \ 2170 range(0, 100) \ 2171 \ 2172 product(uintx, YoungGenerationSizeSupplement, 80, \ 2173 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2174 range(0, 100) \ 2175 \ 2176 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2177 "Decay factor to YoungedGenerationSizeSupplement") \ 2178 range(1, max_uintx) \ 2179 \ 2180 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2181 "Adaptive size percentage change in tenured generation") \ 2182 range(0, 100) \ 2183 \ 2184 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2185 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2186 range(0, 100) \ 2187 \ 2188 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2189 "Decay factor to TenuredGenerationSizeIncrement") \ 2190 range(1, max_uintx) \ 2191 \ 2192 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2193 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2194 "or (G1 Only) the maximum GC time per MMU time slice") \ 2195 range(1, max_uintx - 1) \ 2196 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2197 \ 2198 product(uintx, GCPauseIntervalMillis, 0, \ 2199 "Time slice for MMU specification") \ 2200 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2201 \ 2202 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2203 "Adaptive size policy maximum GC minor pause time goal " \ 2204 "in millisecond") \ 2205 range(0, max_uintx) \ 2206 \ 2207 product(uintx, GCTimeRatio, 99, \ 2208 "Adaptive size policy application time to GC time ratio") \ 2209 range(0, max_juint) \ 2210 \ 2211 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2212 "Adaptive size scale down factor for shrinking") \ 2213 range(1, max_uintx) \ 2214 \ 2215 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2216 "Adaptive size decays the major cost for long major intervals") \ 2217 \ 2218 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2219 "Time scale over which major costs decay") \ 2220 range(0, max_uintx) \ 2221 \ 2222 product(uintx, MinSurvivorRatio, 3, \ 2223 "Minimum ratio of young generation/survivor space size") \ 2224 range(3, max_uintx) \ 2225 \ 2226 product(uintx, InitialSurvivorRatio, 8, \ 2227 "Initial ratio of young generation/survivor space size") \ 2228 range(0, max_uintx) \ 2229 \ 2230 product(size_t, BaseFootPrintEstimate, 256*M, \ 2231 "Estimate of footprint other than Java Heap") \ 2232 range(0, max_uintx) \ 2233 \ 2234 product(bool, UseGCOverheadLimit, true, \ 2235 "Use policy to limit of proportion of time spent in GC " \ 2236 "before an OutOfMemory error is thrown") \ 2237 \ 2238 product(uintx, GCTimeLimit, 98, \ 2239 "Limit of the proportion of time spent in GC before " \ 2240 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2241 range(0, 100) \ 2242 \ 2243 product(uintx, GCHeapFreeLimit, 2, \ 2244 "Minimum percentage of free space after a full GC before an " \ 2245 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2246 range(0, 100) \ 2247 \ 2248 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2249 "Number of consecutive collections before gc time limit fires") \ 2250 range(1, max_uintx) \ 2251 \ 2252 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2253 "How far ahead to prefetch destination area (<= 0 means off)") \ 2254 range(-1, max_jint) \ 2255 \ 2256 product(intx, PrefetchScanIntervalInBytes, -1, \ 2257 "How far ahead to prefetch scan area (<= 0 means off)") \ 2258 range(-1, max_jint) \ 2259 \ 2260 product(intx, PrefetchFieldsAhead, -1, \ 2261 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2262 range(-1, max_jint) \ 2263 \ 2264 diagnostic(bool, VerifyDuringStartup, false, \ 2265 "Verify memory system before executing any Java code " \ 2266 "during VM initialization") \ 2267 \ 2268 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2269 "Verify system before exiting") \ 2270 \ 2271 diagnostic(bool, VerifyBeforeGC, false, \ 2272 "Verify memory system before GC") \ 2273 \ 2274 diagnostic(bool, VerifyAfterGC, false, \ 2275 "Verify memory system after GC") \ 2276 \ 2277 diagnostic(bool, VerifyDuringGC, false, \ 2278 "Verify memory system during GC (between phases)") \ 2279 \ 2280 diagnostic(ccstrlist, VerifySubSet, "", \ 2281 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2282 "are enabled. One or more sub-systems can be specified " \ 2283 "in a comma separated string. Sub-systems are: " \ 2284 "threads, heap, symbol_table, string_table, codecache, " \ 2285 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2286 "codecache_oops") \ 2287 \ 2288 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2289 "Enable parallel memory system verification") \ 2290 \ 2291 diagnostic(bool, DeferInitialCardMark, false, \ 2292 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2293 "may arise from new_pre_store_barrier") \ 2294 \ 2295 product(bool, UseCondCardMark, false, \ 2296 "Check for already marked card before updating card table") \ 2297 \ 2298 diagnostic(bool, VerifyRememberedSets, false, \ 2299 "Verify GC remembered sets") \ 2300 \ 2301 diagnostic(bool, VerifyObjectStartArray, true, \ 2302 "Verify GC object start array if verify before/after") \ 2303 \ 2304 product(bool, DisableExplicitGC, false, \ 2305 "Ignore calls to System.gc()") \ 2306 \ 2307 notproduct(bool, CheckMemoryInitialization, false, \ 2308 "Check memory initialization") \ 2309 \ 2310 diagnostic(bool, BindCMSThreadToCPU, false, \ 2311 "Bind CMS Thread to CPU if possible") \ 2312 \ 2313 diagnostic(uintx, CPUForCMSThread, 0, \ 2314 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2315 range(0, max_juint) \ 2316 \ 2317 product(bool, BindGCTaskThreadsToCPUs, false, \ 2318 "Bind GCTaskThreads to CPUs if possible") \ 2319 \ 2320 product(bool, UseGCTaskAffinity, false, \ 2321 "Use worker affinity when asking for GCTasks") \ 2322 \ 2323 product(uintx, ProcessDistributionStride, 4, \ 2324 "Stride through processors when distributing processes") \ 2325 range(0, max_juint) \ 2326 \ 2327 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2328 "Number of times the coordinator GC thread will sleep while " \ 2329 "yielding before giving up and resuming GC") \ 2330 range(0, max_juint) \ 2331 \ 2332 product(uintx, CMSYieldSleepCount, 0, \ 2333 "Number of times a GC thread (minus the coordinator) " \ 2334 "will sleep while yielding before giving up and resuming GC") \ 2335 range(0, max_juint) \ 2336 \ 2337 product(bool, PrintGC, false, \ 2338 "Print message at garbage collection. " \ 2339 "Deprecated, use -Xlog:gc instead.") \ 2340 \ 2341 product(bool, PrintGCDetails, false, \ 2342 "Print more details at garbage collection. " \ 2343 "Deprecated, use -Xlog:gc* instead.") \ 2344 \ 2345 develop(intx, ConcGCYieldTimeout, 0, \ 2346 "If non-zero, assert that GC threads yield within this " \ 2347 "number of milliseconds") \ 2348 range(0, max_intx) \ 2349 \ 2350 develop(bool, TraceFinalizerRegistration, false, \ 2351 "Trace registration of final references") \ 2352 \ 2353 notproduct(bool, TraceScavenge, false, \ 2354 "Trace scavenge") \ 2355 \ 2356 product(bool, IgnoreEmptyClassPaths, false, \ 2357 "Ignore empty path elements in -classpath") \ 2358 \ 2359 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2360 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2361 "Initial size of the boot class loader data metaspace") \ 2362 range(30*K, max_uintx/BytesPerWord) \ 2363 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2364 \ 2365 product(bool, TraceYoungGenTime, false, \ 2366 "Trace accumulated time for young collection") \ 2367 \ 2368 product(bool, TraceOldGenTime, false, \ 2369 "Trace accumulated time for old collection") \ 2370 \ 2371 product(bool, PrintHeapAtSIGBREAK, true, \ 2372 "Print heap layout in response to SIGBREAK") \ 2373 \ 2374 manageable(bool, PrintClassHistogram, false, \ 2375 "Print a histogram of class instances") \ 2376 \ 2377 develop(bool, TraceGCTaskManager, false, \ 2378 "Trace actions of the GC task manager") \ 2379 \ 2380 develop(bool, TraceGCTaskQueue, false, \ 2381 "Trace actions of the GC task queues") \ 2382 \ 2383 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2384 "Trace marking phase in ParallelOldGC") \ 2385 \ 2386 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2387 "Trace dense prefix computation for ParallelOldGC") \ 2388 \ 2389 develop(bool, IgnoreLibthreadGPFault, false, \ 2390 "Suppress workaround for libthread GP fault") \ 2391 \ 2392 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2393 "The percentage of the used heap that the instances of a class " \ 2394 "must occupy for the class to generate a trace event") \ 2395 range(0.0, 100.0) \ 2396 \ 2397 /* JVMTI heap profiling */ \ 2398 \ 2399 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2400 "Trace JVMTI object tagging calls") \ 2401 \ 2402 diagnostic(bool, VerifyBeforeIteration, false, \ 2403 "Verify memory system before JVMTI iteration") \ 2404 \ 2405 /* compiler interface */ \ 2406 \ 2407 develop(bool, CIPrintCompilerName, false, \ 2408 "when CIPrint is active, print the name of the active compiler") \ 2409 \ 2410 diagnostic(bool, CIPrintCompileQueue, false, \ 2411 "display the contents of the compile queue whenever a " \ 2412 "compilation is enqueued") \ 2413 \ 2414 develop(bool, CIPrintRequests, false, \ 2415 "display every request for compilation") \ 2416 \ 2417 product(bool, CITime, false, \ 2418 "collect timing information for compilation") \ 2419 \ 2420 develop(bool, CITimeVerbose, false, \ 2421 "be more verbose in compilation timings") \ 2422 \ 2423 develop(bool, CITimeEach, false, \ 2424 "display timing information after each successful compilation") \ 2425 \ 2426 develop(bool, CICountOSR, false, \ 2427 "use a separate counter when assigning ids to osr compilations") \ 2428 \ 2429 develop(bool, CICompileNatives, true, \ 2430 "compile native methods if supported by the compiler") \ 2431 \ 2432 develop_pd(bool, CICompileOSR, \ 2433 "compile on stack replacement methods if supported by the " \ 2434 "compiler") \ 2435 \ 2436 develop(bool, CIPrintMethodCodes, false, \ 2437 "print method bytecodes of the compiled code") \ 2438 \ 2439 develop(bool, CIPrintTypeFlow, false, \ 2440 "print the results of ciTypeFlow analysis") \ 2441 \ 2442 develop(bool, CITraceTypeFlow, false, \ 2443 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2444 \ 2445 develop(intx, OSROnlyBCI, -1, \ 2446 "OSR only at this bci. Negative values mean exclude that bci") \ 2447 \ 2448 /* compiler */ \ 2449 \ 2450 /* notice: the max range value here is max_jint, not max_intx */ \ 2451 /* because of overflow issue */ \ 2452 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2453 "Number of compiler threads to run") \ 2454 range(0, max_jint) \ 2455 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2456 \ 2457 product(intx, CompilationPolicyChoice, 0, \ 2458 "which compilation policy (0-3)") \ 2459 range(0, 3) \ 2460 \ 2461 develop(bool, UseStackBanging, true, \ 2462 "use stack banging for stack overflow checks (required for " \ 2463 "proper StackOverflow handling; disable only to measure cost " \ 2464 "of stackbanging)") \ 2465 \ 2466 develop(bool, UseStrictFP, true, \ 2467 "use strict fp if modifier strictfp is set") \ 2468 \ 2469 develop(bool, GenerateSynchronizationCode, true, \ 2470 "generate locking/unlocking code for synchronized methods and " \ 2471 "monitors") \ 2472 \ 2473 develop(bool, GenerateRangeChecks, true, \ 2474 "Generate range checks for array accesses") \ 2475 \ 2476 diagnostic_pd(bool, ImplicitNullChecks, \ 2477 "Generate code for implicit null checks") \ 2478 \ 2479 product_pd(bool, TrapBasedNullChecks, \ 2480 "Generate code for null checks that uses a cmp and trap " \ 2481 "instruction raising SIGTRAP. This is only used if an access to" \ 2482 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2483 "ImplicitNullChecks don't work (PPC64).") \ 2484 \ 2485 product(bool, PrintSafepointStatistics, false, \ 2486 "Print statistics about safepoint synchronization") \ 2487 \ 2488 product(intx, PrintSafepointStatisticsCount, 300, \ 2489 "Total number of safepoint statistics collected " \ 2490 "before printing them out") \ 2491 range(1, max_intx) \ 2492 \ 2493 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2494 "Print safepoint statistics only when safepoint takes " \ 2495 "more than PrintSafepointSatisticsTimeout in millis") \ 2496 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2497 NOT_LP64(range(-1, max_intx)) \ 2498 \ 2499 product(bool, Inline, true, \ 2500 "Enable inlining") \ 2501 \ 2502 product(bool, ClipInlining, true, \ 2503 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2504 \ 2505 develop(bool, UseCHA, true, \ 2506 "Enable CHA") \ 2507 \ 2508 product(bool, UseTypeProfile, true, \ 2509 "Check interpreter profile for historically monomorphic calls") \ 2510 \ 2511 diagnostic(bool, PrintInlining, false, \ 2512 "Print inlining optimizations") \ 2513 \ 2514 product(bool, UsePopCountInstruction, false, \ 2515 "Use population count instruction") \ 2516 \ 2517 develop(bool, EagerInitialization, false, \ 2518 "Eagerly initialize classes if possible") \ 2519 \ 2520 diagnostic(bool, LogTouchedMethods, false, \ 2521 "Log methods which have been ever touched in runtime") \ 2522 \ 2523 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2524 "Print all methods that have been ever touched in runtime") \ 2525 \ 2526 develop(bool, TraceMethodReplacement, false, \ 2527 "Print when methods are replaced do to recompilation") \ 2528 \ 2529 develop(bool, PrintMethodFlushing, false, \ 2530 "Print the nmethods being flushed") \ 2531 \ 2532 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2533 "print statistics about method flushing") \ 2534 \ 2535 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2536 "Number of compiled code invocations after which " \ 2537 "the method is considered as hot by the flusher") \ 2538 range(1, max_jint) \ 2539 \ 2540 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2541 "Minimum number of sweeper passes before an nmethod " \ 2542 "can be flushed") \ 2543 range(0, max_intx) \ 2544 \ 2545 product(bool, UseCodeAging, true, \ 2546 "Insert counter to detect warm methods") \ 2547 \ 2548 diagnostic(bool, StressCodeAging, false, \ 2549 "Start with counters compiled in") \ 2550 \ 2551 develop(bool, StressCodeBuffers, false, \ 2552 "Exercise code buffer expansion and other rare state changes") \ 2553 \ 2554 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2555 "Generate extra debugging information for non-safepoints in " \ 2556 "nmethods") \ 2557 \ 2558 product(bool, PrintVMOptions, false, \ 2559 "Print flags that appeared on the command line") \ 2560 \ 2561 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2562 "Ignore unrecognized VM options") \ 2563 \ 2564 product(bool, PrintCommandLineFlags, false, \ 2565 "Print flags specified on command line or set by ergonomics") \ 2566 \ 2567 product(bool, PrintFlagsInitial, false, \ 2568 "Print all VM flags before argument processing and exit VM") \ 2569 \ 2570 product(bool, PrintFlagsFinal, false, \ 2571 "Print all VM flags after argument and ergonomic processing") \ 2572 \ 2573 notproduct(bool, PrintFlagsWithComments, false, \ 2574 "Print all VM flags with default values and descriptions and " \ 2575 "exit") \ 2576 \ 2577 product(bool, PrintFlagsRanges, false, \ 2578 "Print VM flags and their ranges and exit VM") \ 2579 \ 2580 diagnostic(bool, SerializeVMOutput, true, \ 2581 "Use a mutex to serialize output to tty and LogFile") \ 2582 \ 2583 diagnostic(bool, DisplayVMOutput, true, \ 2584 "Display all VM output on the tty, independently of LogVMOutput") \ 2585 \ 2586 diagnostic(bool, LogVMOutput, false, \ 2587 "Save VM output to LogFile") \ 2588 \ 2589 diagnostic(ccstr, LogFile, NULL, \ 2590 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2591 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2592 \ 2593 product(ccstr, ErrorFile, NULL, \ 2594 "If an error occurs, save the error data to this file " \ 2595 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2596 \ 2597 product(bool, DisplayVMOutputToStderr, false, \ 2598 "If DisplayVMOutput is true, display all VM output to stderr") \ 2599 \ 2600 product(bool, DisplayVMOutputToStdout, false, \ 2601 "If DisplayVMOutput is true, display all VM output to stdout") \ 2602 \ 2603 product(bool, UseHeavyMonitors, false, \ 2604 "use heavyweight instead of lightweight Java monitors") \ 2605 \ 2606 product(bool, PrintStringTableStatistics, false, \ 2607 "print statistics about the StringTable and SymbolTable") \ 2608 \ 2609 diagnostic(bool, VerifyStringTableAtExit, false, \ 2610 "verify StringTable contents at exit") \ 2611 \ 2612 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2613 "print histogram of the symbol table") \ 2614 \ 2615 notproduct(bool, ExitVMOnVerifyError, false, \ 2616 "standard exit from VM if bytecode verify error " \ 2617 "(only in debug mode)") \ 2618 \ 2619 diagnostic(ccstr, AbortVMOnException, NULL, \ 2620 "Call fatal if this exception is thrown. Example: " \ 2621 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2622 \ 2623 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2624 "Call fatal if the exception pointed by AbortVMOnException " \ 2625 "has this message") \ 2626 \ 2627 develop(bool, DebugVtables, false, \ 2628 "add debugging code to vtable dispatch") \ 2629 \ 2630 notproduct(bool, PrintVtableStats, false, \ 2631 "print vtables stats at end of run") \ 2632 \ 2633 develop(bool, TraceCreateZombies, false, \ 2634 "trace creation of zombie nmethods") \ 2635 \ 2636 notproduct(bool, IgnoreLockingAssertions, false, \ 2637 "disable locking assertions (for speed)") \ 2638 \ 2639 product(bool, RangeCheckElimination, true, \ 2640 "Eliminate range checks") \ 2641 \ 2642 develop_pd(bool, UncommonNullCast, \ 2643 "track occurrences of null in casts; adjust compiler tactics") \ 2644 \ 2645 develop(bool, TypeProfileCasts, true, \ 2646 "treat casts like calls for purposes of type profiling") \ 2647 \ 2648 develop(bool, DelayCompilationDuringStartup, true, \ 2649 "Delay invoking the compiler until main application class is " \ 2650 "loaded") \ 2651 \ 2652 develop(bool, CompileTheWorld, false, \ 2653 "Compile all methods in all classes in bootstrap class path " \ 2654 "(stress test)") \ 2655 \ 2656 develop(bool, CompileTheWorldPreloadClasses, true, \ 2657 "Preload all classes used by a class before start loading") \ 2658 \ 2659 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2660 "Force a safepoint every n compiles so sweeper can keep up") \ 2661 \ 2662 develop(bool, FillDelaySlots, true, \ 2663 "Fill delay slots (on SPARC only)") \ 2664 \ 2665 develop(bool, TimeLivenessAnalysis, false, \ 2666 "Time computation of bytecode liveness analysis") \ 2667 \ 2668 develop(bool, TraceLivenessGen, false, \ 2669 "Trace the generation of liveness analysis information") \ 2670 \ 2671 notproduct(bool, TraceLivenessQuery, false, \ 2672 "Trace queries of liveness analysis information") \ 2673 \ 2674 notproduct(bool, CollectIndexSetStatistics, false, \ 2675 "Collect information about IndexSets") \ 2676 \ 2677 develop(bool, UseLoopSafepoints, true, \ 2678 "Generate Safepoint nodes in every loop") \ 2679 \ 2680 develop(intx, FastAllocateSizeLimit, 128*K, \ 2681 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2682 "Inline allocations larger than this in doublewords must go slow")\ 2683 \ 2684 product(bool, AggressiveOpts, false, \ 2685 "Enable aggressive optimizations - see arguments.cpp") \ 2686 \ 2687 product_pd(bool, CompactStrings, \ 2688 "Enable Strings to use single byte chars in backing store") \ 2689 \ 2690 product_pd(uintx, TypeProfileLevel, \ 2691 "=XYZ, with Z: Type profiling of arguments at call; " \ 2692 "Y: Type profiling of return value at call; " \ 2693 "X: Type profiling of parameters to methods; " \ 2694 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2695 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2696 \ 2697 product(intx, TypeProfileArgsLimit, 2, \ 2698 "max number of call arguments to consider for type profiling") \ 2699 range(0, 16) \ 2700 \ 2701 product(intx, TypeProfileParmsLimit, 2, \ 2702 "max number of incoming parameters to consider for type profiling"\ 2703 ", -1 for all") \ 2704 range(-1, 64) \ 2705 \ 2706 /* statistics */ \ 2707 develop(bool, CountCompiledCalls, false, \ 2708 "Count method invocations") \ 2709 \ 2710 notproduct(bool, CountRuntimeCalls, false, \ 2711 "Count VM runtime calls") \ 2712 \ 2713 develop(bool, CountJNICalls, false, \ 2714 "Count jni method invocations") \ 2715 \ 2716 notproduct(bool, CountJVMCalls, false, \ 2717 "Count jvm method invocations") \ 2718 \ 2719 notproduct(bool, CountRemovableExceptions, false, \ 2720 "Count exceptions that could be replaced by branches due to " \ 2721 "inlining") \ 2722 \ 2723 notproduct(bool, ICMissHistogram, false, \ 2724 "Produce histogram of IC misses") \ 2725 \ 2726 /* interpreter */ \ 2727 product_pd(bool, RewriteBytecodes, \ 2728 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2729 \ 2730 product_pd(bool, RewriteFrequentPairs, \ 2731 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2732 \ 2733 diagnostic(bool, PrintInterpreter, false, \ 2734 "Print the generated interpreter code") \ 2735 \ 2736 product(bool, UseInterpreter, true, \ 2737 "Use interpreter for non-compiled methods") \ 2738 \ 2739 develop(bool, UseFastSignatureHandlers, true, \ 2740 "Use fast signature handlers for native calls") \ 2741 \ 2742 product(bool, UseLoopCounter, true, \ 2743 "Increment invocation counter on backward branch") \ 2744 \ 2745 product_pd(bool, UseOnStackReplacement, \ 2746 "Use on stack replacement, calls runtime if invoc. counter " \ 2747 "overflows in loop") \ 2748 \ 2749 notproduct(bool, TraceOnStackReplacement, false, \ 2750 "Trace on stack replacement") \ 2751 \ 2752 product_pd(bool, PreferInterpreterNativeStubs, \ 2753 "Use always interpreter stubs for native methods invoked via " \ 2754 "interpreter") \ 2755 \ 2756 develop(bool, CountBytecodes, false, \ 2757 "Count number of bytecodes executed") \ 2758 \ 2759 develop(bool, PrintBytecodeHistogram, false, \ 2760 "Print histogram of the executed bytecodes") \ 2761 \ 2762 develop(bool, PrintBytecodePairHistogram, false, \ 2763 "Print histogram of the executed bytecode pairs") \ 2764 \ 2765 diagnostic(bool, PrintSignatureHandlers, false, \ 2766 "Print code generated for native method signature handlers") \ 2767 \ 2768 develop(bool, VerifyOops, false, \ 2769 "Do plausibility checks for oops") \ 2770 \ 2771 develop(bool, CheckUnhandledOops, false, \ 2772 "Check for unhandled oops in VM code") \ 2773 \ 2774 develop(bool, VerifyJNIFields, trueInDebug, \ 2775 "Verify jfieldIDs for instance fields") \ 2776 \ 2777 notproduct(bool, VerifyJNIEnvThread, false, \ 2778 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2779 "from JNI") \ 2780 \ 2781 develop(bool, VerifyFPU, false, \ 2782 "Verify FPU state (check for NaN's, etc.)") \ 2783 \ 2784 develop(bool, VerifyThread, false, \ 2785 "Watch the thread register for corruption (SPARC only)") \ 2786 \ 2787 develop(bool, VerifyActivationFrameSize, false, \ 2788 "Verify that activation frame didn't become smaller than its " \ 2789 "minimal size") \ 2790 \ 2791 develop(bool, TraceFrequencyInlining, false, \ 2792 "Trace frequency based inlining") \ 2793 \ 2794 develop_pd(bool, InlineIntrinsics, \ 2795 "Inline intrinsics that can be statically resolved") \ 2796 \ 2797 product_pd(bool, ProfileInterpreter, \ 2798 "Profile at the bytecode level during interpretation") \ 2799 \ 2800 develop(bool, TraceProfileInterpreter, false, \ 2801 "Trace profiling at the bytecode level during interpretation. " \ 2802 "This outputs the profiling information collected to improve " \ 2803 "jit compilation.") \ 2804 \ 2805 develop_pd(bool, ProfileTraps, \ 2806 "Profile deoptimization traps at the bytecode level") \ 2807 \ 2808 product(intx, ProfileMaturityPercentage, 20, \ 2809 "number of method invocations/branches (expressed as % of " \ 2810 "CompileThreshold) before using the method's profile") \ 2811 range(0, 100) \ 2812 \ 2813 diagnostic(bool, PrintMethodData, false, \ 2814 "Print the results of +ProfileInterpreter at end of run") \ 2815 \ 2816 develop(bool, VerifyDataPointer, trueInDebug, \ 2817 "Verify the method data pointer during interpreter profiling") \ 2818 \ 2819 develop(bool, VerifyCompiledCode, false, \ 2820 "Include miscellaneous runtime verifications in nmethod code; " \ 2821 "default off because it disturbs nmethod size heuristics") \ 2822 \ 2823 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2824 "Manually make GC thread crash then dump java stack trace; " \ 2825 "Test only") \ 2826 \ 2827 /* compilation */ \ 2828 product(bool, UseCompiler, true, \ 2829 "Use Just-In-Time compilation") \ 2830 \ 2831 develop(bool, TraceCompilationPolicy, false, \ 2832 "Trace compilation policy") \ 2833 \ 2834 develop(bool, TimeCompilationPolicy, false, \ 2835 "Time the compilation policy") \ 2836 \ 2837 product(bool, UseCounterDecay, true, \ 2838 "Adjust recompilation counters") \ 2839 \ 2840 develop(intx, CounterHalfLifeTime, 30, \ 2841 "Half-life time of invocation counters (in seconds)") \ 2842 \ 2843 develop(intx, CounterDecayMinIntervalLength, 500, \ 2844 "The minimum interval (in milliseconds) between invocation of " \ 2845 "CounterDecay") \ 2846 \ 2847 product(bool, AlwaysCompileLoopMethods, false, \ 2848 "When using recompilation, never interpret methods " \ 2849 "containing loops") \ 2850 \ 2851 product(bool, DontCompileHugeMethods, true, \ 2852 "Do not compile methods > HugeMethodLimit") \ 2853 \ 2854 /* Bytecode escape analysis estimation. */ \ 2855 product(bool, EstimateArgEscape, true, \ 2856 "Analyze bytecodes to estimate escape state of arguments") \ 2857 \ 2858 product(intx, BCEATraceLevel, 0, \ 2859 "How much tracing to do of bytecode escape analysis estimates " \ 2860 "(0-3)") \ 2861 range(0, 3) \ 2862 \ 2863 product(intx, MaxBCEAEstimateLevel, 5, \ 2864 "Maximum number of nested calls that are analyzed by BC EA") \ 2865 range(0, max_jint) \ 2866 \ 2867 product(intx, MaxBCEAEstimateSize, 150, \ 2868 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2869 range(0, max_jint) \ 2870 \ 2871 product(intx, AllocatePrefetchStyle, 1, \ 2872 "0 = no prefetch, " \ 2873 "1 = generate prefetch instructions for each allocation, " \ 2874 "2 = use TLAB watermark to gate allocation prefetch, " \ 2875 "3 = generate one prefetch instruction per cache line") \ 2876 range(0, 3) \ 2877 \ 2878 product(intx, AllocatePrefetchDistance, -1, \ 2879 "Distance to prefetch ahead of allocation pointer. " \ 2880 "-1: use system-specific value (automatically determined") \ 2881 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2882 \ 2883 product(intx, AllocatePrefetchLines, 3, \ 2884 "Number of lines to prefetch ahead of array allocation pointer") \ 2885 range(1, 64) \ 2886 \ 2887 product(intx, AllocateInstancePrefetchLines, 1, \ 2888 "Number of lines to prefetch ahead of instance allocation " \ 2889 "pointer") \ 2890 range(1, 64) \ 2891 \ 2892 product(intx, AllocatePrefetchStepSize, 16, \ 2893 "Step size in bytes of sequential prefetch instructions") \ 2894 range(1, 512) \ 2895 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2896 \ 2897 product(intx, AllocatePrefetchInstr, 0, \ 2898 "Select instruction to prefetch ahead of allocation pointer") \ 2899 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2900 \ 2901 /* deoptimization */ \ 2902 develop(bool, TraceDeoptimization, false, \ 2903 "Trace deoptimization") \ 2904 \ 2905 develop(bool, PrintDeoptimizationDetails, false, \ 2906 "Print more information about deoptimization") \ 2907 \ 2908 develop(bool, DebugDeoptimization, false, \ 2909 "Tracing various information while debugging deoptimization") \ 2910 \ 2911 product(intx, SelfDestructTimer, 0, \ 2912 "Will cause VM to terminate after a given time (in minutes) " \ 2913 "(0 means off)") \ 2914 range(0, max_intx) \ 2915 \ 2916 product(intx, MaxJavaStackTraceDepth, 1024, \ 2917 "The maximum number of lines in the stack trace for Java " \ 2918 "exceptions (0 means all)") \ 2919 range(0, max_jint/2) \ 2920 \ 2921 /* notice: the max range value here is max_jint, not max_intx */ \ 2922 /* because of overflow issue */ \ 2923 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2924 "Guarantee a safepoint (at least) every so many milliseconds " \ 2925 "(0 means none)") \ 2926 range(0, max_jint) \ 2927 \ 2928 product(intx, SafepointTimeoutDelay, 10000, \ 2929 "Delay in milliseconds for option SafepointTimeout") \ 2930 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2931 NOT_LP64(range(0, max_intx)) \ 2932 \ 2933 product(intx, NmethodSweepActivity, 10, \ 2934 "Removes cold nmethods from code cache if > 0. Higher values " \ 2935 "result in more aggressive sweeping") \ 2936 range(0, 2000) \ 2937 \ 2938 notproduct(bool, LogSweeper, false, \ 2939 "Keep a ring buffer of sweeper activity") \ 2940 \ 2941 notproduct(intx, SweeperLogEntries, 1024, \ 2942 "Number of records in the ring buffer of sweeper activity") \ 2943 \ 2944 notproduct(intx, MemProfilingInterval, 500, \ 2945 "Time between each invocation of the MemProfiler") \ 2946 \ 2947 develop(intx, MallocCatchPtr, -1, \ 2948 "Hit breakpoint when mallocing/freeing this pointer") \ 2949 \ 2950 notproduct(ccstrlist, SuppressErrorAt, "", \ 2951 "List of assertions (file:line) to muzzle") \ 2952 \ 2953 develop(intx, StackPrintLimit, 100, \ 2954 "number of stack frames to print in VM-level stack dump") \ 2955 \ 2956 notproduct(intx, MaxElementPrintSize, 256, \ 2957 "maximum number of elements to print") \ 2958 \ 2959 notproduct(intx, MaxSubklassPrintSize, 4, \ 2960 "maximum number of subklasses to print when printing klass") \ 2961 \ 2962 product(intx, MaxInlineLevel, 9, \ 2963 "maximum number of nested calls that are inlined") \ 2964 range(0, max_jint) \ 2965 \ 2966 product(intx, MaxRecursiveInlineLevel, 1, \ 2967 "maximum number of nested recursive calls that are inlined") \ 2968 range(0, max_jint) \ 2969 \ 2970 develop(intx, MaxForceInlineLevel, 100, \ 2971 "maximum number of nested calls that are forced for inlining " \ 2972 "(using CompileCommand or marked w/ @ForceInline)") \ 2973 range(0, max_jint) \ 2974 \ 2975 product_pd(intx, InlineSmallCode, \ 2976 "Only inline already compiled methods if their code size is " \ 2977 "less than this") \ 2978 range(0, max_jint) \ 2979 \ 2980 product(intx, MaxInlineSize, 35, \ 2981 "The maximum bytecode size of a method to be inlined") \ 2982 range(0, max_jint) \ 2983 \ 2984 product_pd(intx, FreqInlineSize, \ 2985 "The maximum bytecode size of a frequent method to be inlined") \ 2986 range(0, max_jint) \ 2987 \ 2988 product(intx, MaxTrivialSize, 6, \ 2989 "The maximum bytecode size of a trivial method to be inlined") \ 2990 range(0, max_jint) \ 2991 \ 2992 product(intx, MinInliningThreshold, 250, \ 2993 "The minimum invocation count a method needs to have to be " \ 2994 "inlined") \ 2995 range(0, max_jint) \ 2996 \ 2997 develop(intx, MethodHistogramCutoff, 100, \ 2998 "The cutoff value for method invocation histogram (+CountCalls)") \ 2999 \ 3000 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3001 "Number of interpreted methods to show in profile") \ 3002 \ 3003 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 3004 "Number of compiled methods to show in profile") \ 3005 \ 3006 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 3007 "Number of stub methods to show in profile") \ 3008 \ 3009 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3010 "Number of runtime stub nodes to show in profile") \ 3011 \ 3012 product(intx, ProfileIntervalsTicks, 100, \ 3013 "Number of ticks between printing of interval profile " \ 3014 "(+ProfileIntervals)") \ 3015 range(0, max_intx) \ 3016 \ 3017 notproduct(intx, ScavengeALotInterval, 1, \ 3018 "Interval between which scavenge will occur with +ScavengeALot") \ 3019 \ 3020 notproduct(intx, FullGCALotInterval, 1, \ 3021 "Interval between which full gc will occur with +FullGCALot") \ 3022 \ 3023 notproduct(intx, FullGCALotStart, 0, \ 3024 "For which invocation to start FullGCAlot") \ 3025 \ 3026 notproduct(intx, FullGCALotDummies, 32*K, \ 3027 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3028 "to move") \ 3029 \ 3030 develop(intx, DontYieldALotInterval, 10, \ 3031 "Interval between which yields will be dropped (milliseconds)") \ 3032 \ 3033 develop(intx, ProfilerPCTickThreshold, 15, \ 3034 "Number of ticks in a PC buckets to be a hotspot") \ 3035 \ 3036 notproduct(intx, DeoptimizeALotInterval, 5, \ 3037 "Number of exits until DeoptimizeALot kicks in") \ 3038 \ 3039 notproduct(intx, ZombieALotInterval, 5, \ 3040 "Number of exits until ZombieALot kicks in") \ 3041 \ 3042 diagnostic(uintx, MallocMaxTestWords, 0, \ 3043 "If non-zero, maximum number of words that malloc/realloc can " \ 3044 "allocate (for testing only)") \ 3045 range(0, max_uintx) \ 3046 \ 3047 product(intx, TypeProfileWidth, 2, \ 3048 "Number of receiver types to record in call/cast profile") \ 3049 range(0, 8) \ 3050 \ 3051 develop(intx, BciProfileWidth, 2, \ 3052 "Number of return bci's to record in ret profile") \ 3053 \ 3054 product(intx, PerMethodRecompilationCutoff, 400, \ 3055 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3056 range(-1, max_intx) \ 3057 \ 3058 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3059 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3060 range(-1, max_intx) \ 3061 \ 3062 product(intx, PerMethodTrapLimit, 100, \ 3063 "Limit on traps (of one kind) in a method (includes inlines)") \ 3064 range(0, max_jint) \ 3065 \ 3066 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3067 "Limit on speculative traps (of one kind) in a method " \ 3068 "(includes inlines)") \ 3069 range(0, max_jint) \ 3070 \ 3071 product(intx, PerBytecodeTrapLimit, 4, \ 3072 "Limit on traps (of one kind) at a particular BCI") \ 3073 range(0, max_jint) \ 3074 \ 3075 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3076 "Extra method data trap entries for speculation") \ 3077 \ 3078 develop(intx, InlineFrequencyRatio, 20, \ 3079 "Ratio of call site execution to caller method invocation") \ 3080 range(0, max_jint) \ 3081 \ 3082 diagnostic_pd(intx, InlineFrequencyCount, \ 3083 "Count of call site execution necessary to trigger frequent " \ 3084 "inlining") \ 3085 range(0, max_jint) \ 3086 \ 3087 develop(intx, InlineThrowCount, 50, \ 3088 "Force inlining of interpreted methods that throw this often") \ 3089 range(0, max_jint) \ 3090 \ 3091 develop(intx, InlineThrowMaxSize, 200, \ 3092 "Force inlining of throwing methods smaller than this") \ 3093 range(0, max_jint) \ 3094 \ 3095 develop(intx, ProfilerNodeSize, 1024, \ 3096 "Size in K to allocate for the Profile Nodes of each thread") \ 3097 range(0, 1024) \ 3098 \ 3099 /* gc parameters */ \ 3100 product(size_t, InitialHeapSize, 0, \ 3101 "Initial heap size (in bytes); zero means use ergonomics") \ 3102 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3103 \ 3104 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3105 "Maximum heap size (in bytes)") \ 3106 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3107 \ 3108 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3109 "Initial tenured generation size (in bytes)") \ 3110 range(0, max_uintx) \ 3111 \ 3112 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3113 "Initial new generation size (in bytes)") \ 3114 constraint(NewSizeConstraintFunc,AfterErgo) \ 3115 \ 3116 product(size_t, MaxNewSize, max_uintx, \ 3117 "Maximum new generation size (in bytes), max_uintx means set " \ 3118 "ergonomically") \ 3119 range(0, max_uintx) \ 3120 \ 3121 product_pd(size_t, HeapBaseMinAddress, \ 3122 "OS specific low limit for heap base address") \ 3123 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3124 \ 3125 product(size_t, PretenureSizeThreshold, 0, \ 3126 "Maximum size in bytes of objects allocated in DefNew " \ 3127 "generation; zero means no maximum") \ 3128 range(0, max_uintx) \ 3129 \ 3130 product(size_t, MinTLABSize, 2*K, \ 3131 "Minimum allowed TLAB size (in bytes)") \ 3132 range(1, max_uintx/2) \ 3133 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3134 \ 3135 product(size_t, TLABSize, 0, \ 3136 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3137 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3138 \ 3139 product(size_t, YoungPLABSize, 4096, \ 3140 "Size of young gen promotion LAB's (in HeapWords)") \ 3141 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3142 \ 3143 product(size_t, OldPLABSize, 1024, \ 3144 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3145 "of blocks to attempt to claim when refilling CMS LAB's") \ 3146 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3147 \ 3148 product(uintx, TLABAllocationWeight, 35, \ 3149 "Allocation averaging weight") \ 3150 range(0, 100) \ 3151 \ 3152 /* Limit the lower bound of this flag to 1 as it is used */ \ 3153 /* in a division expression. */ \ 3154 product(uintx, TLABWasteTargetPercent, 1, \ 3155 "Percentage of Eden that can be wasted") \ 3156 range(1, 100) \ 3157 \ 3158 product(uintx, TLABRefillWasteFraction, 64, \ 3159 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3160 range(1, max_juint) \ 3161 \ 3162 product(uintx, TLABWasteIncrement, 4, \ 3163 "Increment allowed waste at slow allocation") \ 3164 range(0, max_jint) \ 3165 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3166 \ 3167 product(uintx, SurvivorRatio, 8, \ 3168 "Ratio of eden/survivor space size") \ 3169 range(1, max_uintx-2) \ 3170 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3171 \ 3172 product(uintx, NewRatio, 2, \ 3173 "Ratio of old/new generation sizes") \ 3174 range(0, max_uintx-1) \ 3175 \ 3176 product_pd(size_t, NewSizeThreadIncrease, \ 3177 "Additional size added to desired new generation size per " \ 3178 "non-daemon thread (in bytes)") \ 3179 range(0, max_uintx) \ 3180 \ 3181 product_pd(size_t, MetaspaceSize, \ 3182 "Initial threshold (in bytes) at which a garbage collection " \ 3183 "is done to reduce Metaspace usage") \ 3184 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3185 \ 3186 product(size_t, MaxMetaspaceSize, max_uintx, \ 3187 "Maximum size of Metaspaces (in bytes)") \ 3188 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3189 \ 3190 product(size_t, CompressedClassSpaceSize, 1*G, \ 3191 "Maximum size of class area in Metaspace when compressed " \ 3192 "class pointers are used") \ 3193 range(1*M, 3*G) \ 3194 \ 3195 manageable(uintx, MinHeapFreeRatio, 40, \ 3196 "The minimum percentage of heap free after GC to avoid expansion."\ 3197 " For most GCs this applies to the old generation. In G1 and" \ 3198 " ParallelGC it applies to the whole heap.") \ 3199 range(0, 100) \ 3200 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3201 \ 3202 manageable(uintx, MaxHeapFreeRatio, 70, \ 3203 "The maximum percentage of heap free after GC to avoid shrinking."\ 3204 " For most GCs this applies to the old generation. In G1 and" \ 3205 " ParallelGC it applies to the whole heap.") \ 3206 range(0, 100) \ 3207 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3208 \ 3209 product(bool, ShrinkHeapInSteps, true, \ 3210 "When disabled, informs the GC to shrink the java heap directly" \ 3211 " to the target size at the next full GC rather than requiring" \ 3212 " smaller steps during multiple full GCs.") \ 3213 \ 3214 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3215 "Number of milliseconds per MB of free space in the heap") \ 3216 range(0, max_intx) \ 3217 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3218 \ 3219 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3220 "The minimum change in heap space due to GC (in bytes)") \ 3221 range(0, max_uintx) \ 3222 \ 3223 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3224 "The minimum expansion of Metaspace (in bytes)") \ 3225 range(0, max_uintx) \ 3226 \ 3227 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3228 "The maximum percentage of Metaspace free after GC to avoid " \ 3229 "shrinking") \ 3230 range(0, 100) \ 3231 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3232 \ 3233 product(uintx, MinMetaspaceFreeRatio, 40, \ 3234 "The minimum percentage of Metaspace free after GC to avoid " \ 3235 "expansion") \ 3236 range(0, 99) \ 3237 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3238 \ 3239 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3240 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3241 range(0, max_uintx) \ 3242 \ 3243 product(uintx, QueuedAllocationWarningCount, 0, \ 3244 "Number of times an allocation that queues behind a GC " \ 3245 "will retry before printing a warning") \ 3246 range(0, max_uintx) \ 3247 \ 3248 diagnostic(uintx, VerifyGCStartAt, 0, \ 3249 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3250 range(0, max_uintx) \ 3251 \ 3252 diagnostic(intx, VerifyGCLevel, 0, \ 3253 "Generation level at which to start +VerifyBefore/AfterGC") \ 3254 range(0, 1) \ 3255 \ 3256 product(uintx, MaxTenuringThreshold, 15, \ 3257 "Maximum value for tenuring threshold") \ 3258 range(0, markOopDesc::max_age + 1) \ 3259 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3260 \ 3261 product(uintx, InitialTenuringThreshold, 7, \ 3262 "Initial value for tenuring threshold") \ 3263 range(0, markOopDesc::max_age + 1) \ 3264 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3265 \ 3266 product(uintx, TargetSurvivorRatio, 50, \ 3267 "Desired percentage of survivor space used after scavenge") \ 3268 range(0, 100) \ 3269 \ 3270 product(uintx, MarkSweepDeadRatio, 5, \ 3271 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3272 "Serial mark sweep treats this as both the minimum and maximum " \ 3273 "value. " \ 3274 "CMS uses this value only if it falls back to mark sweep. " \ 3275 "Par compact uses a variable scale based on the density of the " \ 3276 "generation and treats this as the maximum value when the heap " \ 3277 "is either completely full or completely empty. Par compact " \ 3278 "also has a smaller default value; see arguments.cpp.") \ 3279 range(0, 100) \ 3280 \ 3281 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3282 "How often should we fully compact the heap (ignoring the dead " \ 3283 "space parameters)") \ 3284 range(1, max_juint) \ 3285 \ 3286 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3287 "Delay between expansion and allocation (in milliseconds)") \ 3288 \ 3289 develop(uintx, GCWorkerDelayMillis, 0, \ 3290 "Delay in scheduling GC workers (in milliseconds)") \ 3291 \ 3292 product(intx, DeferThrSuspendLoopCount, 4000, \ 3293 "(Unstable) Number of times to iterate in safepoint loop " \ 3294 "before blocking VM threads ") \ 3295 range(-1, max_jint-1) \ 3296 \ 3297 product(intx, DeferPollingPageLoopCount, -1, \ 3298 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3299 "before changing safepoint polling page to RO ") \ 3300 range(-1, max_jint-1) \ 3301 \ 3302 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3303 range(0, max_intx) \ 3304 \ 3305 product(bool, PSChunkLargeArrays, true, \ 3306 "Process large arrays in chunks") \ 3307 \ 3308 product(uintx, GCDrainStackTargetSize, 64, \ 3309 "Number of entries we will try to leave on the stack " \ 3310 "during parallel gc") \ 3311 range(0, max_juint) \ 3312 \ 3313 /* stack parameters */ \ 3314 product_pd(intx, StackYellowPages, \ 3315 "Number of yellow zone (recoverable overflows) pages of size " \ 3316 "4KB. If pages are bigger yellow zone is aligned up.") \ 3317 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3318 \ 3319 product_pd(intx, StackRedPages, \ 3320 "Number of red zone (unrecoverable overflows) pages of size " \ 3321 "4KB. If pages are bigger red zone is aligned up.") \ 3322 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3323 \ 3324 product_pd(intx, StackReservedPages, \ 3325 "Number of reserved zone (reserved to annotated methods) pages" \ 3326 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3327 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3328 \ 3329 product(bool, RestrictReservedStack, true, \ 3330 "Restrict @ReservedStackAccess to trusted classes") \ 3331 \ 3332 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3333 product_pd(intx, StackShadowPages, \ 3334 "Number of shadow zone (for overflow checking) pages of size " \ 3335 "4KB. If pages are bigger shadow zone is aligned up. " \ 3336 "This should exceed the depth of the VM and native call stack.") \ 3337 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3338 \ 3339 product_pd(intx, ThreadStackSize, \ 3340 "Thread Stack Size (in Kbytes)") \ 3341 range(0, 1 * M) \ 3342 \ 3343 product_pd(intx, VMThreadStackSize, \ 3344 "Non-Java Thread Stack Size (in Kbytes)") \ 3345 range(0, max_intx/(1 * K)) \ 3346 \ 3347 product_pd(intx, CompilerThreadStackSize, \ 3348 "Compiler Thread Stack Size (in Kbytes)") \ 3349 range(0, max_intx/(1 * K)) \ 3350 \ 3351 develop_pd(size_t, JVMInvokeMethodSlack, \ 3352 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3353 \ 3354 /* code cache parameters */ \ 3355 develop_pd(uintx, CodeCacheSegmentSize, \ 3356 "Code cache segment size (in bytes) - smallest unit of " \ 3357 "allocation") \ 3358 range(1, 1024) \ 3359 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3360 \ 3361 develop_pd(intx, CodeEntryAlignment, \ 3362 "Code entry alignment for generated code (in bytes)") \ 3363 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3364 \ 3365 product_pd(intx, OptoLoopAlignment, \ 3366 "Align inner loops to zero relative to this modulus") \ 3367 range(1, 16) \ 3368 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3369 \ 3370 product_pd(uintx, InitialCodeCacheSize, \ 3371 "Initial code cache size (in bytes)") \ 3372 range(0, max_uintx) \ 3373 \ 3374 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3375 "Minimum code cache size (in bytes) required to start VM.") \ 3376 range(0, max_uintx) \ 3377 \ 3378 product(bool, SegmentedCodeCache, false, \ 3379 "Use a segmented code cache") \ 3380 \ 3381 product_pd(uintx, ReservedCodeCacheSize, \ 3382 "Reserved code cache size (in bytes) - maximum code cache size") \ 3383 range(0, max_uintx) \ 3384 \ 3385 product_pd(uintx, NonProfiledCodeHeapSize, \ 3386 "Size of code heap with non-profiled methods (in bytes)") \ 3387 range(0, max_uintx) \ 3388 \ 3389 product_pd(uintx, ProfiledCodeHeapSize, \ 3390 "Size of code heap with profiled methods (in bytes)") \ 3391 range(0, max_uintx) \ 3392 \ 3393 product_pd(uintx, NonNMethodCodeHeapSize, \ 3394 "Size of code heap with non-nmethods (in bytes)") \ 3395 range(0, max_uintx) \ 3396 \ 3397 product_pd(uintx, CodeCacheExpansionSize, \ 3398 "Code cache expansion size (in bytes)") \ 3399 range(0, max_uintx) \ 3400 \ 3401 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 3402 "Minimum number of segments in a code cache block") \ 3403 range(1, 100) \ 3404 \ 3405 notproduct(bool, ExitOnFullCodeCache, false, \ 3406 "Exit the VM if we fill the code cache") \ 3407 \ 3408 product(bool, UseCodeCacheFlushing, true, \ 3409 "Remove cold/old nmethods from the code cache") \ 3410 \ 3411 product(uintx, StartAggressiveSweepingAt, 10, \ 3412 "Start aggressive sweeping if X[%] of the code cache is free." \ 3413 "Segmented code cache: X[%] of the non-profiled heap." \ 3414 "Non-segmented code cache: X[%] of the total code cache") \ 3415 range(0, 100) \ 3416 \ 3417 /* AOT parameters */ \ 3418 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3419 "Use AOT compiled files") \ 3420 \ 3421 product(ccstrlist, AOTLibrary, NULL, \ 3422 "AOT library") \ 3423 \ 3424 product(bool, PrintAOT, false, \ 3425 "Print used AOT klasses and methods") \ 3426 \ 3427 notproduct(bool, PrintAOTStatistics, false, \ 3428 "Print AOT statistics") \ 3429 \ 3430 diagnostic(bool, UseAOTStrictLoading, false, \ 3431 "Exit the VM if any of the AOT libraries has invalid config") \ 3432 \ 3433 product(bool, CalculateClassFingerprint, false, \ 3434 "Calculate class fingerprint") \ 3435 \ 3436 /* interpreter debugging */ \ 3437 develop(intx, BinarySwitchThreshold, 5, \ 3438 "Minimal number of lookupswitch entries for rewriting to binary " \ 3439 "switch") \ 3440 \ 3441 develop(intx, StopInterpreterAt, 0, \ 3442 "Stop interpreter execution at specified bytecode number") \ 3443 \ 3444 develop(intx, TraceBytecodesAt, 0, \ 3445 "Trace bytecodes starting with specified bytecode number") \ 3446 \ 3447 /* compiler interface */ \ 3448 develop(intx, CIStart, 0, \ 3449 "The id of the first compilation to permit") \ 3450 \ 3451 develop(intx, CIStop, max_jint, \ 3452 "The id of the last compilation to permit") \ 3453 \ 3454 develop(intx, CIStartOSR, 0, \ 3455 "The id of the first osr compilation to permit " \ 3456 "(CICountOSR must be on)") \ 3457 \ 3458 develop(intx, CIStopOSR, max_jint, \ 3459 "The id of the last osr compilation to permit " \ 3460 "(CICountOSR must be on)") \ 3461 \ 3462 develop(intx, CIBreakAtOSR, -1, \ 3463 "The id of osr compilation to break at") \ 3464 \ 3465 develop(intx, CIBreakAt, -1, \ 3466 "The id of compilation to break at") \ 3467 \ 3468 product(ccstrlist, CompileOnly, "", \ 3469 "List of methods (pkg/class.name) to restrict compilation to") \ 3470 \ 3471 product(ccstr, CompileCommandFile, NULL, \ 3472 "Read compiler commands from this file [.hotspot_compiler]") \ 3473 \ 3474 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3475 "Read compiler directives from this file") \ 3476 \ 3477 product(ccstrlist, CompileCommand, "", \ 3478 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3479 \ 3480 develop(bool, ReplayCompiles, false, \ 3481 "Enable replay of compilations from ReplayDataFile") \ 3482 \ 3483 product(ccstr, ReplayDataFile, NULL, \ 3484 "File containing compilation replay information" \ 3485 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3486 \ 3487 product(ccstr, InlineDataFile, NULL, \ 3488 "File containing inlining replay information" \ 3489 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3490 \ 3491 develop(intx, ReplaySuppressInitializers, 2, \ 3492 "Control handling of class initialization during replay: " \ 3493 "0 - don't do anything special; " \ 3494 "1 - treat all class initializers as empty; " \ 3495 "2 - treat class initializers for application classes as empty; " \ 3496 "3 - allow all class initializers to run during bootstrap but " \ 3497 " pretend they are empty after starting replay") \ 3498 range(0, 3) \ 3499 \ 3500 develop(bool, ReplayIgnoreInitErrors, false, \ 3501 "Ignore exceptions thrown during initialization for replay") \ 3502 \ 3503 product(bool, DumpReplayDataOnError, true, \ 3504 "Record replay data for crashing compiler threads") \ 3505 \ 3506 product(bool, CICompilerCountPerCPU, false, \ 3507 "1 compiler thread for log(N CPUs)") \ 3508 \ 3509 develop(intx, CIFireOOMAt, -1, \ 3510 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3511 "(non-negative value throws OOM after this many CI accesses " \ 3512 "in each compile)") \ 3513 notproduct(intx, CICrashAt, -1, \ 3514 "id of compilation to trigger assert in compiler thread for " \ 3515 "the purpose of testing, e.g. generation of replay data") \ 3516 notproduct(bool, CIObjectFactoryVerify, false, \ 3517 "enable potentially expensive verification in ciObjectFactory") \ 3518 \ 3519 /* Priorities */ \ 3520 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3521 \ 3522 product(intx, ThreadPriorityPolicy, 0, \ 3523 "0 : Normal. "\ 3524 " VM chooses priorities that are appropriate for normal "\ 3525 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3526 " to normal native priority. Java priorities below " \ 3527 " NORM_PRIORITY map to lower native priority values. On "\ 3528 " Windows applications are allowed to use higher native "\ 3529 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3530 " not use the highest possible native priority, "\ 3531 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3532 " system threads. On Linux thread priorities are ignored "\ 3533 " because the OS does not support static priority in "\ 3534 " SCHED_OTHER scheduling class which is the only choice for "\ 3535 " non-root, non-realtime applications. "\ 3536 "1 : Aggressive. "\ 3537 " Java thread priorities map over to the entire range of "\ 3538 " native thread priorities. Higher Java thread priorities map "\ 3539 " to higher native thread priorities. This policy should be "\ 3540 " used with care, as sometimes it can cause performance "\ 3541 " degradation in the application and/or the entire system. On "\ 3542 " Linux this policy requires root privilege.") \ 3543 range(0, 1) \ 3544 \ 3545 product(bool, ThreadPriorityVerbose, false, \ 3546 "Print priority changes") \ 3547 \ 3548 product(intx, CompilerThreadPriority, -1, \ 3549 "The native priority at which compiler threads should run " \ 3550 "(-1 means no change)") \ 3551 range(min_jint, max_jint) \ 3552 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3553 \ 3554 product(intx, VMThreadPriority, -1, \ 3555 "The native priority at which the VM thread should run " \ 3556 "(-1 means no change)") \ 3557 range(-1, 127) \ 3558 \ 3559 product(bool, CompilerThreadHintNoPreempt, true, \ 3560 "(Solaris only) Give compiler threads an extra quanta") \ 3561 \ 3562 product(bool, VMThreadHintNoPreempt, false, \ 3563 "(Solaris only) Give VM thread an extra quanta") \ 3564 \ 3565 product(intx, JavaPriority1_To_OSPriority, -1, \ 3566 "Map Java priorities to OS priorities") \ 3567 range(-1, 127) \ 3568 \ 3569 product(intx, JavaPriority2_To_OSPriority, -1, \ 3570 "Map Java priorities to OS priorities") \ 3571 range(-1, 127) \ 3572 \ 3573 product(intx, JavaPriority3_To_OSPriority, -1, \ 3574 "Map Java priorities to OS priorities") \ 3575 range(-1, 127) \ 3576 \ 3577 product(intx, JavaPriority4_To_OSPriority, -1, \ 3578 "Map Java priorities to OS priorities") \ 3579 range(-1, 127) \ 3580 \ 3581 product(intx, JavaPriority5_To_OSPriority, -1, \ 3582 "Map Java priorities to OS priorities") \ 3583 range(-1, 127) \ 3584 \ 3585 product(intx, JavaPriority6_To_OSPriority, -1, \ 3586 "Map Java priorities to OS priorities") \ 3587 range(-1, 127) \ 3588 \ 3589 product(intx, JavaPriority7_To_OSPriority, -1, \ 3590 "Map Java priorities to OS priorities") \ 3591 range(-1, 127) \ 3592 \ 3593 product(intx, JavaPriority8_To_OSPriority, -1, \ 3594 "Map Java priorities to OS priorities") \ 3595 range(-1, 127) \ 3596 \ 3597 product(intx, JavaPriority9_To_OSPriority, -1, \ 3598 "Map Java priorities to OS priorities") \ 3599 range(-1, 127) \ 3600 \ 3601 product(intx, JavaPriority10_To_OSPriority,-1, \ 3602 "Map Java priorities to OS priorities") \ 3603 range(-1, 127) \ 3604 \ 3605 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3606 "Java thread priority 10 maps to critical scheduling priority") \ 3607 \ 3608 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3609 "Compiler thread(s) run at critical scheduling priority") \ 3610 \ 3611 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3612 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3613 \ 3614 /* compiler debugging */ \ 3615 notproduct(intx, CompileTheWorldStartAt, 1, \ 3616 "First class to consider when using +CompileTheWorld") \ 3617 \ 3618 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3619 "Last class to consider when using +CompileTheWorld") \ 3620 \ 3621 develop(intx, NewCodeParameter, 0, \ 3622 "Testing Only: Create a dedicated integer parameter before " \ 3623 "putback") \ 3624 \ 3625 /* new oopmap storage allocation */ \ 3626 develop(intx, MinOopMapAllocation, 8, \ 3627 "Minimum number of OopMap entries in an OopMapSet") \ 3628 \ 3629 /* Background Compilation */ \ 3630 develop(intx, LongCompileThreshold, 50, \ 3631 "Used with +TraceLongCompiles") \ 3632 \ 3633 /* recompilation */ \ 3634 product_pd(intx, CompileThreshold, \ 3635 "number of interpreted method invocations before (re-)compiling") \ 3636 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3637 \ 3638 product(double, CompileThresholdScaling, 1.0, \ 3639 "Factor to control when first compilation happens " \ 3640 "(both with and without tiered compilation): " \ 3641 "values greater than 1.0 delay counter overflow, " \ 3642 "values between 0 and 1.0 rush counter overflow, " \ 3643 "value of 1.0 leaves compilation thresholds unchanged " \ 3644 "value of 0.0 is equivalent to -Xint. " \ 3645 "" \ 3646 "Flag can be set as per-method option. " \ 3647 "If a value is specified for a method, compilation thresholds " \ 3648 "for that method are scaled by both the value of the global flag "\ 3649 "and the value of the per-method flag.") \ 3650 range(0.0, DBL_MAX) \ 3651 \ 3652 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3653 "Interpreter (tier 0) invocation notification frequency") \ 3654 range(0, 30) \ 3655 \ 3656 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3657 "C1 without MDO (tier 2) invocation notification frequency") \ 3658 range(0, 30) \ 3659 \ 3660 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3661 "C1 with MDO profiling (tier 3) invocation notification " \ 3662 "frequency") \ 3663 range(0, 30) \ 3664 \ 3665 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3666 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3667 range(0, 30) \ 3668 \ 3669 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3670 "Interpreter (tier 0) invocation notification frequency") \ 3671 range(0, 30) \ 3672 \ 3673 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3674 "C1 without MDO (tier 2) invocation notification frequency") \ 3675 range(0, 30) \ 3676 \ 3677 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3678 "C1 with MDO profiling (tier 3) invocation notification " \ 3679 "frequency") \ 3680 range(0, 30) \ 3681 \ 3682 product(intx, Tier2CompileThreshold, 0, \ 3683 "threshold at which tier 2 compilation is invoked") \ 3684 range(0, max_jint) \ 3685 \ 3686 product(intx, Tier2BackEdgeThreshold, 0, \ 3687 "Back edge threshold at which tier 2 compilation is invoked") \ 3688 range(0, max_jint) \ 3689 \ 3690 product(intx, Tier3InvocationThreshold, 200, \ 3691 "Compile if number of method invocations crosses this " \ 3692 "threshold") \ 3693 range(0, max_jint) \ 3694 \ 3695 product(intx, Tier3MinInvocationThreshold, 100, \ 3696 "Minimum invocation to compile at tier 3") \ 3697 range(0, max_jint) \ 3698 \ 3699 product(intx, Tier3CompileThreshold, 2000, \ 3700 "Threshold at which tier 3 compilation is invoked (invocation " \ 3701 "minimum must be satisfied)") \ 3702 range(0, max_jint) \ 3703 \ 3704 product(intx, Tier3BackEdgeThreshold, 60000, \ 3705 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3706 range(0, max_jint) \ 3707 \ 3708 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3709 "Compile if number of method invocations crosses this " \ 3710 "threshold if coming from AOT") \ 3711 range(0, max_jint) \ 3712 \ 3713 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3714 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3715 range(0, max_jint) \ 3716 \ 3717 product(intx, Tier3AOTCompileThreshold, 15000, \ 3718 "Threshold at which tier 3 compilation is invoked (invocation " \ 3719 "minimum must be satisfied) if coming from AOT") \ 3720 range(0, max_jint) \ 3721 \ 3722 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3723 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3724 "if coming from AOT") \ 3725 range(0, max_jint) \ 3726 \ 3727 product(intx, Tier4InvocationThreshold, 5000, \ 3728 "Compile if number of method invocations crosses this " \ 3729 "threshold") \ 3730 range(0, max_jint) \ 3731 \ 3732 product(intx, Tier4MinInvocationThreshold, 600, \ 3733 "Minimum invocation to compile at tier 4") \ 3734 range(0, max_jint) \ 3735 \ 3736 product(intx, Tier4CompileThreshold, 15000, \ 3737 "Threshold at which tier 4 compilation is invoked (invocation " \ 3738 "minimum must be satisfied") \ 3739 range(0, max_jint) \ 3740 \ 3741 product(intx, Tier4BackEdgeThreshold, 40000, \ 3742 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3743 range(0, max_jint) \ 3744 \ 3745 product(intx, Tier3DelayOn, 5, \ 3746 "If C2 queue size grows over this amount per compiler thread " \ 3747 "stop compiling at tier 3 and start compiling at tier 2") \ 3748 range(0, max_jint) \ 3749 \ 3750 product(intx, Tier3DelayOff, 2, \ 3751 "If C2 queue size is less than this amount per compiler thread " \ 3752 "allow methods compiled at tier 2 transition to tier 3") \ 3753 range(0, max_jint) \ 3754 \ 3755 product(intx, Tier3LoadFeedback, 5, \ 3756 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3757 "reaches this amount per compiler thread") \ 3758 range(0, max_jint) \ 3759 \ 3760 product(intx, Tier4LoadFeedback, 3, \ 3761 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3762 "reaches this amount per compiler thread") \ 3763 range(0, max_jint) \ 3764 \ 3765 product(intx, TieredCompileTaskTimeout, 50, \ 3766 "Kill compile task if method was not used within " \ 3767 "given timeout in milliseconds") \ 3768 range(0, max_intx) \ 3769 \ 3770 product(intx, TieredStopAtLevel, 4, \ 3771 "Stop at given compilation level") \ 3772 range(0, 4) \ 3773 \ 3774 product(intx, Tier0ProfilingStartPercentage, 200, \ 3775 "Start profiling in interpreter if the counters exceed tier 3 " \ 3776 "thresholds by the specified percentage") \ 3777 range(0, max_jint) \ 3778 \ 3779 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3780 "Increase the compile threshold for C1 compilation if the code " \ 3781 "cache is filled by the specified percentage") \ 3782 range(0, 99) \ 3783 \ 3784 product(intx, TieredRateUpdateMinTime, 1, \ 3785 "Minimum rate sampling interval (in milliseconds)") \ 3786 range(0, max_intx) \ 3787 \ 3788 product(intx, TieredRateUpdateMaxTime, 25, \ 3789 "Maximum rate sampling interval (in milliseconds)") \ 3790 range(0, max_intx) \ 3791 \ 3792 product_pd(bool, TieredCompilation, \ 3793 "Enable tiered compilation") \ 3794 \ 3795 product(bool, PrintTieredEvents, false, \ 3796 "Print tiered events notifications") \ 3797 \ 3798 product_pd(intx, OnStackReplacePercentage, \ 3799 "NON_TIERED number of method invocations/branches (expressed as " \ 3800 "% of CompileThreshold) before (re-)compiling OSR code") \ 3801 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3802 \ 3803 product(intx, InterpreterProfilePercentage, 33, \ 3804 "NON_TIERED number of method invocations/branches (expressed as " \ 3805 "% of CompileThreshold) before profiling in the interpreter") \ 3806 range(0, 100) \ 3807 \ 3808 develop(intx, MaxRecompilationSearchLength, 10, \ 3809 "The maximum number of frames to inspect when searching for " \ 3810 "recompilee") \ 3811 \ 3812 develop(intx, MaxInterpretedSearchLength, 3, \ 3813 "The maximum number of interpreted frames to skip when searching "\ 3814 "for recompilee") \ 3815 \ 3816 develop(intx, DesiredMethodLimit, 8000, \ 3817 "The desired maximum method size (in bytecodes) after inlining") \ 3818 \ 3819 develop(intx, HugeMethodLimit, 8000, \ 3820 "Don't compile methods larger than this if " \ 3821 "+DontCompileHugeMethods") \ 3822 \ 3823 /* New JDK 1.4 reflection implementation */ \ 3824 \ 3825 develop(intx, FastSuperclassLimit, 8, \ 3826 "Depth of hardwired instanceof accelerator array") \ 3827 \ 3828 /* Properties for Java libraries */ \ 3829 \ 3830 product(uint64_t, MaxDirectMemorySize, 0, \ 3831 "Maximum total size of NIO direct-buffer allocations") \ 3832 range(0, max_jlong) \ 3833 \ 3834 /* Flags used for temporary code during development */ \ 3835 \ 3836 diagnostic(bool, UseNewCode, false, \ 3837 "Testing Only: Use the new version while testing") \ 3838 \ 3839 diagnostic(bool, UseNewCode2, false, \ 3840 "Testing Only: Use the new version while testing") \ 3841 \ 3842 diagnostic(bool, UseNewCode3, false, \ 3843 "Testing Only: Use the new version while testing") \ 3844 \ 3845 /* flags for performance data collection */ \ 3846 \ 3847 product(bool, UsePerfData, true, \ 3848 "Flag to disable jvmstat instrumentation for performance testing "\ 3849 "and problem isolation purposes") \ 3850 \ 3851 product(bool, PerfDataSaveToFile, false, \ 3852 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3853 \ 3854 product(ccstr, PerfDataSaveFile, NULL, \ 3855 "Save PerfData memory to the specified absolute pathname. " \ 3856 "The string %p in the file name (if present) " \ 3857 "will be replaced by pid") \ 3858 \ 3859 product(intx, PerfDataSamplingInterval, 50, \ 3860 "Data sampling interval (in milliseconds)") \ 3861 range(PeriodicTask::min_interval, max_jint) \ 3862 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3863 \ 3864 product(bool, PerfDisableSharedMem, false, \ 3865 "Store performance data in standard memory") \ 3866 \ 3867 product(intx, PerfDataMemorySize, 32*K, \ 3868 "Size of performance data memory region. Will be rounded " \ 3869 "up to a multiple of the native os page size.") \ 3870 range(128, 32*64*K) \ 3871 \ 3872 product(intx, PerfMaxStringConstLength, 1024, \ 3873 "Maximum PerfStringConstant string length before truncation") \ 3874 range(32, 32*K) \ 3875 \ 3876 product(bool, PerfAllowAtExitRegistration, false, \ 3877 "Allow registration of atexit() methods") \ 3878 \ 3879 product(bool, PerfBypassFileSystemCheck, false, \ 3880 "Bypass Win32 file system criteria checks (Windows Only)") \ 3881 \ 3882 product(intx, UnguardOnExecutionViolation, 0, \ 3883 "Unguard page and retry on no-execute fault (Win32 only) " \ 3884 "0=off, 1=conservative, 2=aggressive") \ 3885 range(0, 2) \ 3886 \ 3887 /* Serviceability Support */ \ 3888 \ 3889 product(bool, ManagementServer, false, \ 3890 "Create JMX Management Server") \ 3891 \ 3892 product(bool, DisableAttachMechanism, false, \ 3893 "Disable mechanism that allows tools to attach to this VM") \ 3894 \ 3895 product(bool, StartAttachListener, false, \ 3896 "Always start Attach Listener at VM startup") \ 3897 \ 3898 product(bool, EnableDynamicAgentLoading, true, \ 3899 "Allow tools to load agents with the attach mechanism") \ 3900 \ 3901 manageable(bool, PrintConcurrentLocks, false, \ 3902 "Print java.util.concurrent locks in thread dump") \ 3903 \ 3904 product(bool, TransmitErrorReport, false, \ 3905 "Enable error report transmission on erroneous termination") \ 3906 \ 3907 product(ccstr, ErrorReportServer, NULL, \ 3908 "Override built-in error report server address") \ 3909 \ 3910 /* Shared spaces */ \ 3911 \ 3912 product(bool, UseSharedSpaces, true, \ 3913 "Use shared spaces for metadata") \ 3914 \ 3915 product(bool, VerifySharedSpaces, false, \ 3916 "Verify shared spaces (false for default archive, true for " \ 3917 "archive specified by -XX:SharedArchiveFile)") \ 3918 \ 3919 product(bool, RequireSharedSpaces, false, \ 3920 "Require shared spaces for metadata") \ 3921 \ 3922 product(bool, DumpSharedSpaces, false, \ 3923 "Special mode: JVM reads a class list, loads classes, builds " \ 3924 "shared spaces, and dumps the shared spaces to a file to be " \ 3925 "used in future JVM runs") \ 3926 \ 3927 product(bool, PrintSharedArchiveAndExit, false, \ 3928 "Print shared archive file contents") \ 3929 \ 3930 product(bool, PrintSharedDictionary, false, \ 3931 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3932 "dictionary") \ 3933 \ 3934 product(size_t, SharedReadWriteSize, 0, \ 3935 "Deprecated") \ 3936 \ 3937 product(size_t, SharedReadOnlySize, 0, \ 3938 "Deprecated") \ 3939 \ 3940 product(size_t, SharedMiscDataSize, 0, \ 3941 "Deprecated") \ 3942 \ 3943 product(size_t, SharedMiscCodeSize, 0, \ 3944 "Deprecated") \ 3945 \ 3946 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3947 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3948 "Address to allocate shared memory region for class data") \ 3949 range(0, SIZE_MAX) \ 3950 \ 3951 product(uintx, SharedSymbolTableBucketSize, 4, \ 3952 "Average number of symbols per bucket in shared table") \ 3953 range(2, 246) \ 3954 \ 3955 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3956 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3957 "classes. Just exclude them from the shared dictionary.") \ 3958 \ 3959 diagnostic(bool, PrintMethodHandleStubs, false, \ 3960 "Print generated stub code for method handles") \ 3961 \ 3962 develop(bool, TraceMethodHandles, false, \ 3963 "trace internal method handle operations") \ 3964 \ 3965 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3966 "perform extra checks when constructing method handles") \ 3967 \ 3968 diagnostic(bool, ShowHiddenFrames, false, \ 3969 "show method handle implementation frames (usually hidden)") \ 3970 \ 3971 experimental(bool, TrustFinalNonStaticFields, false, \ 3972 "trust final non-static declarations for constant folding") \ 3973 \ 3974 diagnostic(bool, FoldStableValues, true, \ 3975 "Optimize loads from stable fields (marked w/ @Stable)") \ 3976 \ 3977 develop(bool, TraceInvokeDynamic, false, \ 3978 "trace internal invoke dynamic operations") \ 3979 \ 3980 diagnostic(bool, PauseAtStartup, false, \ 3981 "Causes the VM to pause at startup time and wait for the pause " \ 3982 "file to be removed (default: ./vm.paused.<pid>)") \ 3983 \ 3984 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3985 "The file to create and for whose removal to await when pausing " \ 3986 "at startup. (default: ./vm.paused.<pid>)") \ 3987 \ 3988 diagnostic(bool, PauseAtExit, false, \ 3989 "Pause and wait for keypress on exit if a debugger is attached") \ 3990 \ 3991 product(bool, ExtendedDTraceProbes, false, \ 3992 "Enable performance-impacting dtrace probes") \ 3993 \ 3994 product(bool, DTraceMethodProbes, false, \ 3995 "Enable dtrace probes for method-entry and method-exit") \ 3996 \ 3997 product(bool, DTraceAllocProbes, false, \ 3998 "Enable dtrace probes for object allocation") \ 3999 \ 4000 product(bool, DTraceMonitorProbes, false, \ 4001 "Enable dtrace probes for monitor events") \ 4002 \ 4003 product(bool, RelaxAccessControlCheck, false, \ 4004 "Relax the access control checks in the verifier") \ 4005 \ 4006 product(uintx, StringTableSize, defaultStringTableSize, \ 4007 "Number of buckets in the interned String table") \ 4008 range(minimumStringTableSize, 111*defaultStringTableSize) \ 4009 \ 4010 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 4011 "Number of buckets in the JVM internal Symbol table") \ 4012 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 4013 \ 4014 product(bool, UseStringDeduplication, false, \ 4015 "Use string deduplication") \ 4016 \ 4017 product(uintx, StringDeduplicationAgeThreshold, 3, \ 4018 "A string must reach this age (or be promoted to an old region) " \ 4019 "to be considered for deduplication") \ 4020 range(1, markOopDesc::max_age) \ 4021 \ 4022 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4023 "Force table resize every time the table is scanned") \ 4024 \ 4025 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4026 "Force table rehash every time the table is scanned") \ 4027 \ 4028 diagnostic(bool, WhiteBoxAPI, false, \ 4029 "Enable internal testing APIs") \ 4030 \ 4031 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4032 "Default survivor space alignment in bytes") \ 4033 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4034 \ 4035 product(bool , AllowNonVirtualCalls, false, \ 4036 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4037 \ 4038 product(ccstr, DumpLoadedClassList, NULL, \ 4039 "Dump the names all loaded classes, that could be stored into " \ 4040 "the CDS archive, in the specified file") \ 4041 \ 4042 product(ccstr, SharedClassListFile, NULL, \ 4043 "Override the default CDS class list") \ 4044 \ 4045 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4046 "Override the default location of the CDS archive file") \ 4047 \ 4048 product(ccstr, ExtraSharedClassListFile, NULL, \ 4049 "Extra classlist for building the CDS archive file") \ 4050 \ 4051 experimental(size_t, ArrayAllocatorMallocLimit, \ 4052 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4053 "Allocation less than this value will be allocated " \ 4054 "using malloc. Larger allocations will use mmap.") \ 4055 \ 4056 experimental(bool, AlwaysAtomicAccesses, false, \ 4057 "Accesses to all variables should always be atomic") \ 4058 \ 4059 product(bool, EnableTracing, false, \ 4060 "Enable event-based tracing") \ 4061 \ 4062 product(bool, UseLockedTracing, false, \ 4063 "Use locked-tracing when doing event-based tracing") \ 4064 \ 4065 diagnostic(bool, UseUnalignedAccesses, false, \ 4066 "Use unaligned memory accesses in Unsafe") \ 4067 \ 4068 product_pd(bool, PreserveFramePointer, \ 4069 "Use the FP register for holding the frame pointer " \ 4070 "and not as a general purpose register.") \ 4071 \ 4072 diagnostic(bool, CheckIntrinsics, true, \ 4073 "When a class C is loaded, check that " \ 4074 "(1) all intrinsics defined by the VM for class C are present "\ 4075 "in the loaded class file and are marked with the " \ 4076 "@HotSpotIntrinsicCandidate annotation, that " \ 4077 "(2) there is an intrinsic registered for all loaded methods " \ 4078 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4079 "annotation, and that " \ 4080 "(3) no orphan methods exist for class C (i.e., methods for " \ 4081 "which the VM declares an intrinsic but that are not declared "\ 4082 "in the loaded class C. " \ 4083 "Check (3) is available only in debug builds.") \ 4084 \ 4085 diagnostic_pd(intx, InitArrayShortSize, \ 4086 "Threshold small size (in bytes) for clearing arrays. " \ 4087 "Anything this size or smaller may get converted to discrete " \ 4088 "scalar stores.") \ 4089 range(0, max_intx) \ 4090 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4091 \ 4092 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4093 "Disable backwards compatibility for compile commands.") \ 4094 \ 4095 diagnostic(bool, CompilerDirectivesPrint, false, \ 4096 "Print compiler directives on installation.") \ 4097 diagnostic(int, CompilerDirectivesLimit, 50, \ 4098 "Limit on number of compiler directives.") \ 4099 \ 4100 product(bool, EnableValhalla, false, \ 4101 "Enable experimental Valhalla features") \ 4102 \ 4103 product(bool, EnableMVT, false, \ 4104 "Enable experimental Minimal Value Types") \ 4105 \ 4106 product_pd(bool, ValueTypePassFieldsAsArgs, \ 4107 "Pass each value type field as an argument at calls") \ 4108 \ 4109 product_pd(bool, ValueTypeReturnedAsFields, \ 4110 "return fields instead of a value type reference") \ 4111 \ 4112 product(size_t, BigValueTypeThreshold, 4 * BytesPerLong, \ 4113 "Max value type size for buffering") \ 4114 \ 4115 product(intx, ValueTypesBufferMaxMemory, 0, \ 4116 "Max memory used for value types buffers (in pages)") \ 4117 \ 4118 product(bool, ValueTypesThreadLocalRecycling, true, \ 4119 "Enable Thread local recycling of buffered values") \ 4120 \ 4121 product(bool, ReportVTBufferRecyclingTimes, false, \ 4122 "Print duration of each VBuffer recycling") \ 4123 \ 4124 product(int, MinimumVTBufferChunkPerFrame, 2, \ 4125 "Minimum number of VT buffer chunk allowed per frame") \ 4126 \ 4127 develop(bool, StressValueTypeReturnedAsFields, false, \ 4128 "stress return of fields instead of a value type reference") \ 4129 4130 4131 4132 4133 /* 4134 * Macros for factoring of globals 4135 */ 4136 4137 // Interface macros 4138 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4139 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4140 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4141 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4142 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4143 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4144 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4145 #ifdef PRODUCT 4146 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4147 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4148 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4149 #else 4150 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4151 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4152 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4153 #endif // PRODUCT 4154 // Special LP64 flags, product only needed for now. 4155 #ifdef _LP64 4156 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4157 #else 4158 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4159 #endif // _LP64 4160 4161 // Implementation macros 4162 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4163 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4164 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4165 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4166 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4167 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4168 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4169 #ifdef PRODUCT 4170 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4171 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4172 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4173 #else 4174 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4175 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4176 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4177 #endif // PRODUCT 4178 #ifdef _LP64 4179 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4180 #else 4181 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4182 #endif // _LP64 4183 4184 // Only materialize src code for range checking when required, ignore otherwise 4185 #define IGNORE_RANGE(a, b) 4186 // Only materialize src code for contraint checking when required, ignore otherwise 4187 #define IGNORE_CONSTRAINT(func,type) 4188 4189 #define IGNORE_WRITEABLE(type) 4190 4191 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4192 DECLARE_PD_DEVELOPER_FLAG, \ 4193 DECLARE_PRODUCT_FLAG, \ 4194 DECLARE_PD_PRODUCT_FLAG, \ 4195 DECLARE_DIAGNOSTIC_FLAG, \ 4196 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4197 DECLARE_EXPERIMENTAL_FLAG, \ 4198 DECLARE_NOTPRODUCT_FLAG, \ 4199 DECLARE_MANAGEABLE_FLAG, \ 4200 DECLARE_PRODUCT_RW_FLAG, \ 4201 DECLARE_LP64_PRODUCT_FLAG, \ 4202 IGNORE_RANGE, \ 4203 IGNORE_CONSTRAINT, \ 4204 IGNORE_WRITEABLE) 4205 4206 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4207 DECLARE_PD_DEVELOPER_FLAG, \ 4208 DECLARE_PRODUCT_FLAG, \ 4209 DECLARE_PD_PRODUCT_FLAG, \ 4210 DECLARE_DIAGNOSTIC_FLAG, \ 4211 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4212 DECLARE_NOTPRODUCT_FLAG, \ 4213 IGNORE_RANGE, \ 4214 IGNORE_CONSTRAINT, \ 4215 IGNORE_WRITEABLE) 4216 4217 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4218 DECLARE_PRODUCT_FLAG, \ 4219 DECLARE_DIAGNOSTIC_FLAG, \ 4220 DECLARE_EXPERIMENTAL_FLAG, \ 4221 DECLARE_NOTPRODUCT_FLAG, \ 4222 IGNORE_RANGE, \ 4223 IGNORE_CONSTRAINT, \ 4224 IGNORE_WRITEABLE) 4225 4226 // Extensions 4227 4228 #include "runtime/globals_ext.hpp" 4229 4230 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP