1 /* 2 * Copyright (c) 1997, 2018, 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 67 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI 68 define_pd_global(bool, BackgroundCompilation, false); 69 define_pd_global(bool, UseTLAB, false); 70 define_pd_global(bool, CICompileOSR, false); 71 define_pd_global(bool, UseTypeProfile, false); 72 define_pd_global(bool, UseOnStackReplacement, false); 73 define_pd_global(bool, InlineIntrinsics, false); 74 define_pd_global(bool, PreferInterpreterNativeStubs, true); 75 define_pd_global(bool, ProfileInterpreter, false); 76 define_pd_global(bool, ProfileTraps, false); 77 define_pd_global(bool, TieredCompilation, false); 78 79 define_pd_global(intx, CompileThreshold, 0); 80 81 define_pd_global(intx, OnStackReplacePercentage, 0); 82 define_pd_global(bool, ResizeTLAB, false); 83 define_pd_global(intx, FreqInlineSize, 0); 84 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 85 define_pd_global(bool, InlineClassNatives, true); 86 define_pd_global(bool, InlineUnsafeOps, true); 87 define_pd_global(uintx, InitialCodeCacheSize, 160*K); 88 define_pd_global(uintx, ReservedCodeCacheSize, 32*M); 89 define_pd_global(uintx, NonProfiledCodeHeapSize, 0); 90 define_pd_global(uintx, ProfiledCodeHeapSize, 0); 91 define_pd_global(uintx, NonNMethodCodeHeapSize, 32*M); 92 93 define_pd_global(uintx, CodeCacheExpansionSize, 32*K); 94 define_pd_global(uintx, CodeCacheMinBlockLength, 1); 95 define_pd_global(uintx, CodeCacheMinimumUseSpace, 200*K); 96 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 97 define_pd_global(bool, NeverActAsServerClassMachine, true); 98 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 99 #define CI_COMPILER_COUNT 0 100 #else 101 102 #if COMPILER2_OR_JVMCI 103 #define CI_COMPILER_COUNT 2 104 #else 105 #define CI_COMPILER_COUNT 1 106 #endif // COMPILER2_OR_JVMCI 107 108 #endif // no compilers 109 110 // string type aliases used only in this file 111 typedef const char* ccstr; 112 typedef const char* ccstrlist; // represents string arguments which accumulate 113 114 // function type that will construct default range string 115 typedef const char* (*RangeStrFunc)(void); 116 117 struct Flag { 118 enum Flags { 119 // latest value origin 120 DEFAULT = 0, 121 COMMAND_LINE = 1, 122 ENVIRON_VAR = 2, 123 CONFIG_FILE = 3, 124 MANAGEMENT = 4, 125 ERGONOMIC = 5, 126 ATTACH_ON_DEMAND = 6, 127 INTERNAL = 7, 128 129 LAST_VALUE_ORIGIN = INTERNAL, 130 VALUE_ORIGIN_BITS = 4, 131 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 132 133 // flag kind 134 KIND_PRODUCT = 1 << 4, 135 KIND_MANAGEABLE = 1 << 5, 136 KIND_DIAGNOSTIC = 1 << 6, 137 KIND_EXPERIMENTAL = 1 << 7, 138 KIND_NOT_PRODUCT = 1 << 8, 139 KIND_DEVELOP = 1 << 9, 140 KIND_PLATFORM_DEPENDENT = 1 << 10, 141 KIND_READ_WRITE = 1 << 11, 142 KIND_C1 = 1 << 12, 143 KIND_C2 = 1 << 13, 144 KIND_ARCH = 1 << 14, 145 KIND_LP64_PRODUCT = 1 << 15, 146 KIND_COMMERCIAL = 1 << 16, 147 KIND_JVMCI = 1 << 17, 148 149 // set this bit if the flag was set on the command line 150 ORIG_COMMAND_LINE = 1 << 18, 151 152 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE) 153 }; 154 155 enum Error { 156 // no error 157 SUCCESS = 0, 158 // flag name is missing 159 MISSING_NAME, 160 // flag value is missing 161 MISSING_VALUE, 162 // error parsing the textual form of the value 163 WRONG_FORMAT, 164 // flag is not writable 165 NON_WRITABLE, 166 // flag value is outside of its bounds 167 OUT_OF_BOUNDS, 168 // flag value violates its constraint 169 VIOLATES_CONSTRAINT, 170 // there is no flag with the given name 171 INVALID_FLAG, 172 // the flag can only be set only on command line during invocation of the VM 173 COMMAND_LINE_ONLY, 174 // the flag may only be set once 175 SET_ONLY_ONCE, 176 // the flag is not writable in this combination of product/debug build 177 CONSTANT, 178 // other, unspecified error related to setting the flag 179 ERR_OTHER 180 }; 181 182 enum MsgType { 183 NONE = 0, 184 DIAGNOSTIC_FLAG_BUT_LOCKED, 185 EXPERIMENTAL_FLAG_BUT_LOCKED, 186 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 187 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD 188 }; 189 190 const char* _type; 191 const char* _name; 192 void* _addr; 193 NOT_PRODUCT(const char* _doc;) 194 Flags _flags; 195 size_t _name_len; 196 197 // points to all Flags static array 198 static Flag* flags; 199 200 // number of flags 201 static size_t numFlags; 202 203 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 204 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 205 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 206 207 static const char* get_int_default_range_str(); 208 static const char* get_uint_default_range_str(); 209 static const char* get_intx_default_range_str(); 210 static const char* get_uintx_default_range_str(); 211 static const char* get_uint64_t_default_range_str(); 212 static const char* get_size_t_default_range_str(); 213 static const char* get_double_default_range_str(); 214 215 Flag::Error check_writable(bool changed); 216 217 bool is_bool() const; 218 bool get_bool() const; 219 Flag::Error set_bool(bool value); 220 221 bool is_int() const; 222 int get_int() const; 223 Flag::Error set_int(int value); 224 225 bool is_uint() const; 226 uint get_uint() const; 227 Flag::Error set_uint(uint value); 228 229 bool is_intx() const; 230 intx get_intx() const; 231 Flag::Error set_intx(intx value); 232 233 bool is_uintx() const; 234 uintx get_uintx() const; 235 Flag::Error set_uintx(uintx value); 236 237 bool is_uint64_t() const; 238 uint64_t get_uint64_t() const; 239 Flag::Error set_uint64_t(uint64_t value); 240 241 bool is_size_t() const; 242 size_t get_size_t() const; 243 Flag::Error set_size_t(size_t value); 244 245 bool is_double() const; 246 double get_double() const; 247 Flag::Error set_double(double value); 248 249 bool is_ccstr() const; 250 bool ccstr_accumulates() const; 251 ccstr get_ccstr() const; 252 Flag::Error set_ccstr(ccstr value); 253 254 Flags get_origin(); 255 void set_origin(Flags origin); 256 257 size_t get_name_length(); 258 259 bool is_default(); 260 bool is_ergonomic(); 261 bool is_command_line(); 262 void set_command_line(); 263 264 bool is_product() const; 265 bool is_manageable() const; 266 bool is_diagnostic() const; 267 bool is_experimental() const; 268 bool is_notproduct() const; 269 bool is_develop() const; 270 bool is_read_write() const; 271 bool is_commercial() const; 272 273 bool is_constant_in_binary() const; 274 275 bool is_unlocker() const; 276 bool is_unlocked() const; 277 bool is_writeable() const; 278 bool is_external() const; 279 280 bool is_unlocker_ext() const; 281 bool is_unlocked_ext() const; 282 bool is_writeable_ext() const; 283 bool is_external_ext() const; 284 285 void clear_diagnostic(); 286 287 Flag::MsgType get_locked_message(char*, int) const; 288 void get_locked_message_ext(char*, int) const; 289 290 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 291 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 292 void print_kind(outputStream* st, unsigned int width); 293 void print_origin(outputStream* st, unsigned int width); 294 void fill_to_pos(outputStream* st, unsigned int req_pos); 295 void print_as_flag(outputStream* st); 296 297 static const char* flag_error_str(Flag::Error error); 298 }; 299 300 // debug flags control various aspects of the VM and are global accessible 301 302 // use FlagSetting to temporarily change some debug flag 303 // e.g. FlagSetting fs(DebugThisAndThat, true); 304 // restored to previous value upon leaving scope 305 class FlagSetting { 306 bool val; 307 bool* flag; 308 public: 309 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 310 ~FlagSetting() { *flag = val; } 311 }; 312 313 314 class CounterSetting { 315 intx* counter; 316 public: 317 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 318 ~CounterSetting() { (*counter)--; } 319 }; 320 321 class IntFlagSetting { 322 int val; 323 int* flag; 324 public: 325 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 326 ~IntFlagSetting() { *flag = val; } 327 }; 328 329 class UIntFlagSetting { 330 uint val; 331 uint* flag; 332 public: 333 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 334 ~UIntFlagSetting() { *flag = val; } 335 }; 336 337 class UIntXFlagSetting { 338 uintx val; 339 uintx* flag; 340 public: 341 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 342 ~UIntXFlagSetting() { *flag = val; } 343 }; 344 345 class DoubleFlagSetting { 346 double val; 347 double* flag; 348 public: 349 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 350 ~DoubleFlagSetting() { *flag = val; } 351 }; 352 353 class SizeTFlagSetting { 354 size_t val; 355 size_t* flag; 356 public: 357 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 358 ~SizeTFlagSetting() { *flag = val; } 359 }; 360 361 // Helper class for temporarily saving the value of a flag during a scope. 362 template <size_t SIZE> 363 class FlagGuard { 364 unsigned char _value[SIZE]; 365 void* const _addr; 366 367 // Hide operator new, this class should only be allocated on the stack. 368 // NOTE: Cannot include memory/allocation.hpp here due to circular 369 // dependencies. 370 void* operator new(size_t size) throw(); 371 void* operator new [](size_t size) throw(); 372 373 public: 374 FlagGuard(void* flag_addr) : _addr(flag_addr) { 375 memcpy(_value, _addr, SIZE); 376 } 377 378 ~FlagGuard() { 379 memcpy(_addr, _value, SIZE); 380 } 381 }; 382 383 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 384 385 class CommandLineFlags { 386 public: 387 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 388 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); } 389 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 390 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 391 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 392 393 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 394 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); } 395 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 396 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 397 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 398 399 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 400 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); } 401 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 402 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 403 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 404 405 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 406 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); } 407 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 408 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 409 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 410 411 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 412 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); } 413 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 414 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 415 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 416 417 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 418 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); } 419 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 420 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 421 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 422 423 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 424 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); } 425 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 426 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 427 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 428 429 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 430 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); } 431 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 432 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 433 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 434 435 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 436 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); } 437 // Contract: Flag will make private copy of the incoming value. 438 // Outgoing value is always malloc-ed, and caller MUST call free. 439 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 440 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 441 442 // Returns false if name is not a command line flag. 443 static bool wasSetOnCmdline(const char* name, bool* value); 444 static void printSetFlags(outputStream* out); 445 446 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 447 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 448 449 static void verify() PRODUCT_RETURN; 450 }; 451 452 // use this for flags that are true by default in the debug version but 453 // false in the optimized version, and vice versa 454 #ifdef ASSERT 455 #define trueInDebug true 456 #define falseInDebug false 457 #else 458 #define trueInDebug false 459 #define falseInDebug true 460 #endif 461 462 // use this for flags that are true per default in the product build 463 // but false in development builds, and vice versa 464 #ifdef PRODUCT 465 #define trueInProduct true 466 #define falseInProduct false 467 #else 468 #define trueInProduct false 469 #define falseInProduct true 470 #endif 471 472 // develop flags are settable / visible only during development and are constant in the PRODUCT version 473 // product flags are always settable / visible 474 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 475 476 // A flag must be declared with one of the following types: 477 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 478 // The type "ccstr" is an alias for "const char*" and is used 479 // only in this file, because the macrology requires single-token type names. 480 481 // Note: Diagnostic options not meant for VM tuning or for product modes. 482 // They are to be used for VM quality assurance or field diagnosis 483 // of VM bugs. They are hidden so that users will not be encouraged to 484 // try them as if they were VM ordinary execution options. However, they 485 // are available in the product version of the VM. Under instruction 486 // from support engineers, VM customers can turn them on to collect 487 // diagnostic information about VM problems. To use a VM diagnostic 488 // option, you must first specify +UnlockDiagnosticVMOptions. 489 // (This master switch also affects the behavior of -Xprintflags.) 490 // 491 // experimental flags are in support of features that are not 492 // part of the officially supported product, but are available 493 // for experimenting with. They could, for example, be performance 494 // features that may not have undergone full or rigorous QA, but which may 495 // help performance in some cases and released for experimentation 496 // by the community of users and developers. This flag also allows one to 497 // be able to build a fully supported product that nonetheless also 498 // ships with some unsupported, lightly tested, experimental features. 499 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 500 // UnlockExperimentalVMOptions flag, which allows the control and 501 // modification of the experimental flags. 502 // 503 // Nota bene: neither diagnostic nor experimental options should be used casually, 504 // and they are not supported on production loads, except under explicit 505 // direction from support engineers. 506 // 507 // manageable flags are writeable external product flags. 508 // They are dynamically writeable through the JDK management interface 509 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 510 // These flags are external exported interface (see CCC). The list of 511 // manageable flags can be queried programmatically through the management 512 // interface. 513 // 514 // A flag can be made as "manageable" only if 515 // - the flag is defined in a CCC as an external exported interface. 516 // - the VM implementation supports dynamic setting of the flag. 517 // This implies that the VM must *always* query the flag variable 518 // and not reuse state related to the flag state at any given time. 519 // - you want the flag to be queried programmatically by the customers. 520 // 521 // product_rw flags are writeable internal product flags. 522 // They are like "manageable" flags but for internal/private use. 523 // The list of product_rw flags are internal/private flags which 524 // may be changed/removed in a future release. It can be set 525 // through the management interface to get/set value 526 // when the name of flag is supplied. 527 // 528 // A flag can be made as "product_rw" only if 529 // - the VM implementation supports dynamic setting of the flag. 530 // This implies that the VM must *always* query the flag variable 531 // and not reuse state related to the flag state at any given time. 532 // 533 // Note that when there is a need to support develop flags to be writeable, 534 // it can be done in the same way as product_rw. 535 // 536 // range is a macro that will expand to min and max arguments for range 537 // checking code if provided - see commandLineFlagRangeList.hpp 538 // 539 // constraint is a macro that will expand to custom function call 540 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 541 // 542 // writeable is a macro that controls if and how the value can change during the runtime 543 // 544 // writeable(Always) is optional and allows the flag to have its value changed 545 // without any limitations at any time 546 // 547 // writeable(Once) flag value's can be only set once during the lifetime of VM 548 // 549 // writeable(CommandLineOnly) flag value's can be only set from command line 550 // (multiple times allowed) 551 // 552 553 554 #define RUNTIME_FLAGS(develop, \ 555 develop_pd, \ 556 product, \ 557 product_pd, \ 558 diagnostic, \ 559 diagnostic_pd, \ 560 experimental, \ 561 notproduct, \ 562 manageable, \ 563 product_rw, \ 564 lp64_product, \ 565 range, \ 566 constraint, \ 567 writeable) \ 568 \ 569 lp64_product(bool, UseCompressedOops, false, \ 570 "Use 32-bit object references in 64-bit VM. " \ 571 "lp64_product means flag is always constant in 32 bit VM") \ 572 \ 573 lp64_product(bool, UseCompressedClassPointers, false, \ 574 "Use 32-bit class pointers in 64-bit VM. " \ 575 "lp64_product means flag is always constant in 32 bit VM") \ 576 \ 577 notproduct(bool, CheckCompressedOops, true, \ 578 "Generate checks in encoding/decoding code in debug VM") \ 579 \ 580 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 581 "Heap allocation steps through preferred address regions to find" \ 582 " where it can allocate the heap. Number of steps to take per " \ 583 "region.") \ 584 range(1, max_uintx) \ 585 \ 586 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 587 "Default object alignment in bytes, 8 is minimum") \ 588 range(8, 256) \ 589 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 590 \ 591 product(bool, AssumeMP, true, \ 592 "(Deprecated) Instruct the VM to assume multiple processors are available")\ 593 \ 594 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 595 /* removal testing. It was supposed to be removed before FCS but has */ \ 596 /* been re-added (see 6401008) */ \ 597 product_pd(bool, UseMembar, \ 598 "(Unstable) Issues membars on thread state transitions") \ 599 \ 600 develop(bool, CleanChunkPoolAsync, true, \ 601 "Clean the chunk pool asynchronously") \ 602 \ 603 product_pd(bool, ThreadLocalHandshakes, \ 604 "Use thread-local polls instead of global poll for safepoints.") \ 605 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 606 \ 607 diagnostic(uint, HandshakeTimeout, 0, \ 608 "If nonzero set a timeout in milliseconds for handshakes") \ 609 \ 610 experimental(bool, AlwaysSafeConstructors, false, \ 611 "Force safe construction, as if all fields are final.") \ 612 \ 613 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 614 "Enable normal processing of flags relating to field diagnostics")\ 615 \ 616 experimental(bool, UnlockExperimentalVMOptions, false, \ 617 "Enable normal processing of flags relating to experimental " \ 618 "features") \ 619 \ 620 product(bool, JavaMonitorsInStackTrace, true, \ 621 "Print information about Java monitor locks when the stacks are" \ 622 "dumped") \ 623 \ 624 product_pd(bool, UseLargePages, \ 625 "Use large page memory") \ 626 \ 627 product_pd(bool, UseLargePagesIndividualAllocation, \ 628 "Allocate large pages individually for better affinity") \ 629 \ 630 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 631 "Fail large pages individual allocation") \ 632 \ 633 product(bool, UseLargePagesInMetaspace, false, \ 634 "Use large page memory in metaspace. " \ 635 "Only used if UseLargePages is enabled.") \ 636 \ 637 product(bool, UseNUMA, false, \ 638 "Use NUMA if available") \ 639 \ 640 product(bool, UseNUMAInterleaving, false, \ 641 "Interleave memory across NUMA nodes if available") \ 642 \ 643 product(size_t, NUMAInterleaveGranularity, 2*M, \ 644 "Granularity to use for NUMA interleaving on Windows OS") \ 645 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 646 \ 647 product(bool, ForceNUMA, false, \ 648 "Force NUMA optimizations on single-node/UMA systems") \ 649 \ 650 product(uintx, NUMAChunkResizeWeight, 20, \ 651 "Percentage (0-100) used to weight the current sample when " \ 652 "computing exponentially decaying average for " \ 653 "AdaptiveNUMAChunkSizing") \ 654 range(0, 100) \ 655 \ 656 product(size_t, NUMASpaceResizeRate, 1*G, \ 657 "Do not reallocate more than this amount per collection") \ 658 range(0, max_uintx) \ 659 \ 660 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 661 "Enable adaptive chunk sizing for NUMA") \ 662 \ 663 product(bool, NUMAStats, false, \ 664 "Print NUMA stats in detailed heap information") \ 665 \ 666 product(uintx, NUMAPageScanRate, 256, \ 667 "Maximum number of pages to include in the page scan procedure") \ 668 range(0, max_uintx) \ 669 \ 670 product_pd(bool, NeedsDeoptSuspend, \ 671 "True for register window machines (sparc/ia64)") \ 672 \ 673 product(intx, UseSSE, 99, \ 674 "Highest supported SSE instructions set on x86/x64") \ 675 range(0, 99) \ 676 \ 677 product(bool, UseAES, false, \ 678 "Control whether AES instructions are used when available") \ 679 \ 680 product(bool, UseFMA, false, \ 681 "Control whether FMA instructions are used when available") \ 682 \ 683 product(bool, UseSHA, false, \ 684 "Control whether SHA instructions are used when available") \ 685 \ 686 diagnostic(bool, UseGHASHIntrinsics, false, \ 687 "Use intrinsics for GHASH versions of crypto") \ 688 \ 689 product(size_t, LargePageSizeInBytes, 0, \ 690 "Large page size (0 to let VM choose the page size)") \ 691 range(0, max_uintx) \ 692 \ 693 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 694 "Use large pages if maximum heap is at least this big") \ 695 range(0, max_uintx) \ 696 \ 697 product(bool, ForceTimeHighResolution, false, \ 698 "Using high time resolution (for Win32 only)") \ 699 \ 700 develop(bool, TracePcPatching, false, \ 701 "Trace usage of frame::patch_pc") \ 702 \ 703 develop(bool, TraceRelocator, false, \ 704 "Trace the bytecode relocator") \ 705 \ 706 develop(bool, TraceLongCompiles, false, \ 707 "Print out every time compilation is longer than " \ 708 "a given threshold") \ 709 \ 710 develop(bool, SafepointALot, false, \ 711 "Generate a lot of safepoints. This works with " \ 712 "GuaranteedSafepointInterval") \ 713 \ 714 product_pd(bool, BackgroundCompilation, \ 715 "A thread requesting compilation is not blocked during " \ 716 "compilation") \ 717 \ 718 product(bool, PrintVMQWaitTime, false, \ 719 "Print out the waiting time in VM operation queue") \ 720 \ 721 product(bool, MethodFlushing, true, \ 722 "Reclamation of zombie and not-entrant methods") \ 723 \ 724 develop(bool, VerifyStack, false, \ 725 "Verify stack of each thread when it is entering a runtime call") \ 726 \ 727 diagnostic(bool, ForceUnreachable, false, \ 728 "Make all non code cache addresses to be unreachable by " \ 729 "forcing use of 64bit literal fixups") \ 730 \ 731 notproduct(bool, StressDerivedPointers, false, \ 732 "Force scavenge when a derived pointer is detected on stack " \ 733 "after rtm call") \ 734 \ 735 develop(bool, TraceDerivedPointers, false, \ 736 "Trace traversal of derived pointers on stack") \ 737 \ 738 notproduct(bool, TraceCodeBlobStacks, false, \ 739 "Trace stack-walk of codeblobs") \ 740 \ 741 product(bool, PrintJNIResolving, false, \ 742 "Used to implement -v:jni") \ 743 \ 744 notproduct(bool, PrintRewrites, false, \ 745 "Print methods that are being rewritten") \ 746 \ 747 product(bool, UseInlineCaches, true, \ 748 "Use Inline Caches for virtual calls ") \ 749 \ 750 diagnostic(bool, InlineArrayCopy, true, \ 751 "Inline arraycopy native that is known to be part of " \ 752 "base library DLL") \ 753 \ 754 diagnostic(bool, InlineObjectHash, true, \ 755 "Inline Object::hashCode() native that is known to be part " \ 756 "of base library DLL") \ 757 \ 758 diagnostic(bool, InlineNatives, true, \ 759 "Inline natives that are known to be part of base library DLL") \ 760 \ 761 diagnostic(bool, InlineMathNatives, true, \ 762 "Inline SinD, CosD, etc.") \ 763 \ 764 diagnostic(bool, InlineClassNatives, true, \ 765 "Inline Class.isInstance, etc") \ 766 \ 767 diagnostic(bool, InlineThreadNatives, true, \ 768 "Inline Thread.currentThread, etc") \ 769 \ 770 diagnostic(bool, InlineUnsafeOps, true, \ 771 "Inline memory ops (native methods) from Unsafe") \ 772 \ 773 product(bool, CriticalJNINatives, true, \ 774 "Check for critical JNI entry points") \ 775 \ 776 notproduct(bool, StressCriticalJNINatives, false, \ 777 "Exercise register saving code in critical natives") \ 778 \ 779 diagnostic(bool, UseAESIntrinsics, false, \ 780 "Use intrinsics for AES versions of crypto") \ 781 \ 782 diagnostic(bool, UseAESCTRIntrinsics, false, \ 783 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 784 \ 785 diagnostic(bool, UseSHA1Intrinsics, false, \ 786 "Use intrinsics for SHA-1 crypto hash function. " \ 787 "Requires that UseSHA is enabled.") \ 788 \ 789 diagnostic(bool, UseSHA256Intrinsics, false, \ 790 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 791 "Requires that UseSHA is enabled.") \ 792 \ 793 diagnostic(bool, UseSHA512Intrinsics, false, \ 794 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 795 "Requires that UseSHA is enabled.") \ 796 \ 797 diagnostic(bool, UseCRC32Intrinsics, false, \ 798 "use intrinsics for java.util.zip.CRC32") \ 799 \ 800 diagnostic(bool, UseCRC32CIntrinsics, false, \ 801 "use intrinsics for java.util.zip.CRC32C") \ 802 \ 803 diagnostic(bool, UseAdler32Intrinsics, false, \ 804 "use intrinsics for java.util.zip.Adler32") \ 805 \ 806 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 807 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 808 \ 809 diagnostic(ccstrlist, DisableIntrinsic, "", \ 810 "do not expand intrinsics whose (internal) names appear here") \ 811 \ 812 develop(bool, TraceCallFixup, false, \ 813 "Trace all call fixups") \ 814 \ 815 develop(bool, DeoptimizeALot, false, \ 816 "Deoptimize at every exit from the runtime system") \ 817 \ 818 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 819 "A comma separated list of bcis to deoptimize at") \ 820 \ 821 product(bool, DeoptimizeRandom, false, \ 822 "Deoptimize random frames on random exit from the runtime system")\ 823 \ 824 notproduct(bool, ZombieALot, false, \ 825 "Create zombies (non-entrant) at exit from the runtime system") \ 826 \ 827 product(bool, UnlinkSymbolsALot, false, \ 828 "Unlink unreferenced symbols from the symbol table at safepoints")\ 829 \ 830 notproduct(bool, WalkStackALot, false, \ 831 "Trace stack (no print) at every exit from the runtime system") \ 832 \ 833 product(bool, Debugging, false, \ 834 "Set when executing debug methods in debug.cpp " \ 835 "(to prevent triggering assertions)") \ 836 \ 837 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 838 "Enable strict checks that safepoints cannot happen for threads " \ 839 "that use NoSafepointVerifier") \ 840 \ 841 notproduct(bool, VerifyLastFrame, false, \ 842 "Verify oops on last frame on entry to VM") \ 843 \ 844 product(bool, FailOverToOldVerifier, true, \ 845 "Fail over to old verifier when split verifier fails") \ 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, VerifyCodeCache, false, \ 896 "Verify code cache on memory allocation/deallocation") \ 897 \ 898 develop(bool, UseMallocOnly, false, \ 899 "Use only malloc/free for allocation (no resource area/arena)") \ 900 \ 901 develop(bool, PrintMallocStatistics, false, \ 902 "Print malloc/free statistics") \ 903 \ 904 develop(bool, ZapResourceArea, trueInDebug, \ 905 "Zap freed resource/arena space with 0xABABABAB") \ 906 \ 907 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 908 "Zap freed VM handle space with 0xBCBCBCBC") \ 909 \ 910 notproduct(bool, ZapStackSegments, trueInDebug, \ 911 "Zap allocated/freed stack segments with 0xFADFADED") \ 912 \ 913 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 914 "Zap unused heap space with 0xBAADBABE") \ 915 \ 916 develop(bool, CheckZapUnusedHeapArea, false, \ 917 "Check zapping of unused heap space") \ 918 \ 919 develop(bool, ZapFillerObjects, trueInDebug, \ 920 "Zap filler objects with 0xDEAFBABE") \ 921 \ 922 develop(bool, PrintVMMessages, true, \ 923 "Print VM messages on console") \ 924 \ 925 notproduct(uintx, ErrorHandlerTest, 0, \ 926 "If > 0, provokes an error after VM initialization; the value " \ 927 "determines which error to provoke. See test_error_handler() " \ 928 "in vmError.cpp.") \ 929 \ 930 notproduct(uintx, TestCrashInErrorHandler, 0, \ 931 "If > 0, provokes an error inside VM error handler (a secondary " \ 932 "crash). see test_error_handler() in vmError.cpp") \ 933 \ 934 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 935 "If true, tests SafeFetch inside error handler.") \ 936 \ 937 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 938 "If true, simulates an unresponsive error handler.") \ 939 \ 940 develop(bool, Verbose, false, \ 941 "Print additional debugging information from other modes") \ 942 \ 943 develop(bool, PrintMiscellaneous, false, \ 944 "Print uncategorized debugging information (requires +Verbose)") \ 945 \ 946 develop(bool, WizardMode, false, \ 947 "Print much more debugging information") \ 948 \ 949 product(bool, ShowMessageBoxOnError, false, \ 950 "Keep process alive on VM fatal error") \ 951 \ 952 product(bool, CreateCoredumpOnCrash, true, \ 953 "Create core/mini dump on VM fatal error") \ 954 \ 955 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 956 "Timeout, in seconds, to limit the time spent on writing an " \ 957 "error log in case of a crash.") \ 958 range(0, (uint64_t)max_jlong/1000) \ 959 \ 960 product_pd(bool, UseOSErrorReporting, \ 961 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 962 \ 963 product(bool, SuppressFatalErrorMessage, false, \ 964 "Report NO fatal error message (avoid deadlock)") \ 965 \ 966 product(ccstrlist, OnError, "", \ 967 "Run user-defined commands on fatal error; see VMError.cpp " \ 968 "for examples") \ 969 \ 970 product(ccstrlist, OnOutOfMemoryError, "", \ 971 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 972 \ 973 manageable(bool, HeapDumpBeforeFullGC, false, \ 974 "Dump heap to file before any major stop-the-world GC") \ 975 \ 976 manageable(bool, HeapDumpAfterFullGC, false, \ 977 "Dump heap to file after any major stop-the-world GC") \ 978 \ 979 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 980 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 981 \ 982 manageable(ccstr, HeapDumpPath, NULL, \ 983 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 984 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 985 "in the working directory)") \ 986 \ 987 develop(bool, BreakAtWarning, false, \ 988 "Execute breakpoint upon encountering VM warning") \ 989 \ 990 develop(bool, UseFakeTimers, false, \ 991 "Tell whether the VM should use system time or a fake timer") \ 992 \ 993 product(ccstr, NativeMemoryTracking, "off", \ 994 "Native memory tracking options") \ 995 \ 996 diagnostic(bool, PrintNMTStatistics, false, \ 997 "Print native memory tracking summary data if it is on") \ 998 \ 999 diagnostic(bool, LogCompilation, false, \ 1000 "Log compilation activity in detail to LogFile") \ 1001 \ 1002 product(bool, PrintCompilation, false, \ 1003 "Print compilations") \ 1004 \ 1005 diagnostic(bool, TraceNMethodInstalls, false, \ 1006 "Trace nmethod installation") \ 1007 \ 1008 diagnostic(intx, ScavengeRootsInCode, 2, \ 1009 "0: do not allow scavengable oops in the code cache; " \ 1010 "1: allow scavenging from the code cache; " \ 1011 "2: emit as many constants as the compiler can see") \ 1012 range(0, 2) \ 1013 \ 1014 product(bool, AlwaysRestoreFPU, false, \ 1015 "Restore the FPU control word after every JNI call (expensive)") \ 1016 \ 1017 diagnostic(bool, PrintCompilation2, false, \ 1018 "Print additional statistics per compilation") \ 1019 \ 1020 diagnostic(bool, PrintAdapterHandlers, false, \ 1021 "Print code generated for i2c/c2i adapters") \ 1022 \ 1023 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1024 "Verify that i2c/c2i adapters are called properly") \ 1025 \ 1026 develop(bool, VerifyAdapterSharing, false, \ 1027 "Verify that the code for shared adapters is the equivalent") \ 1028 \ 1029 diagnostic(bool, PrintAssembly, false, \ 1030 "Print assembly code (using external disassembler.so)") \ 1031 \ 1032 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1033 "Print options string passed to disassembler.so") \ 1034 \ 1035 notproduct(bool, PrintNMethodStatistics, false, \ 1036 "Print a summary statistic for the generated nmethods") \ 1037 \ 1038 diagnostic(bool, PrintNMethods, false, \ 1039 "Print assembly code for nmethods when generated") \ 1040 \ 1041 diagnostic(bool, PrintNativeNMethods, false, \ 1042 "Print assembly code for native nmethods when generated") \ 1043 \ 1044 develop(bool, PrintDebugInfo, false, \ 1045 "Print debug information for all nmethods when generated") \ 1046 \ 1047 develop(bool, PrintRelocations, false, \ 1048 "Print relocation information for all nmethods when generated") \ 1049 \ 1050 develop(bool, PrintDependencies, false, \ 1051 "Print dependency information for all nmethods when generated") \ 1052 \ 1053 develop(bool, PrintExceptionHandlers, false, \ 1054 "Print exception handler tables for all nmethods when generated") \ 1055 \ 1056 develop(bool, StressCompiledExceptionHandlers, false, \ 1057 "Exercise compiled exception handlers") \ 1058 \ 1059 develop(bool, InterceptOSException, false, \ 1060 "Start debugger when an implicit OS (e.g. NULL) " \ 1061 "exception happens") \ 1062 \ 1063 product(bool, PrintCodeCache, false, \ 1064 "Print the code cache memory usage when exiting") \ 1065 \ 1066 develop(bool, PrintCodeCache2, false, \ 1067 "Print detailed usage information on the code cache when exiting")\ 1068 \ 1069 product(bool, PrintCodeCacheOnCompilation, false, \ 1070 "Print the code cache memory usage each time a method is " \ 1071 "compiled") \ 1072 \ 1073 diagnostic(bool, PrintStubCode, false, \ 1074 "Print generated stub code") \ 1075 \ 1076 product(bool, StackTraceInThrowable, true, \ 1077 "Collect backtrace in throwable when exception happens") \ 1078 \ 1079 product(bool, OmitStackTraceInFastThrow, true, \ 1080 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1081 \ 1082 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1083 "Print bytecode statistics when dumping profiler output") \ 1084 \ 1085 product(bool, ProfilerRecordPC, false, \ 1086 "Collect ticks for each 16 byte interval of compiled code") \ 1087 \ 1088 product(bool, ProfileVM, false, \ 1089 "Profile ticks that fall within VM (either in the VM Thread " \ 1090 "or VM code called through stubs)") \ 1091 \ 1092 product(bool, ProfileIntervals, false, \ 1093 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1094 \ 1095 notproduct(bool, ProfilerCheckIntervals, false, \ 1096 "Collect and print information on spacing of profiler ticks") \ 1097 \ 1098 product(bool, PrintWarnings, true, \ 1099 "Print JVM warnings to output stream") \ 1100 \ 1101 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1102 "Print warnings for stalled SpinLocks") \ 1103 \ 1104 product(bool, RegisterFinalizersAtInit, true, \ 1105 "Register finalizable objects at end of Object.<init> or " \ 1106 "after allocation") \ 1107 \ 1108 develop(bool, RegisterReferences, true, \ 1109 "Tell whether the VM should register soft/weak/final/phantom " \ 1110 "references") \ 1111 \ 1112 develop(bool, IgnoreRewrites, false, \ 1113 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1114 "This is unsafe!") \ 1115 \ 1116 develop(bool, PrintCodeCacheExtension, false, \ 1117 "Print extension of code cache") \ 1118 \ 1119 develop(bool, UsePrivilegedStack, true, \ 1120 "Enable the security JVM functions") \ 1121 \ 1122 develop(bool, ProtectionDomainVerification, true, \ 1123 "Verify protection domain before resolution in system dictionary")\ 1124 \ 1125 product(bool, ClassUnloading, true, \ 1126 "Do unloading of classes") \ 1127 \ 1128 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1129 "Do unloading of classes with a concurrent marking cycle") \ 1130 \ 1131 develop(bool, DisableStartThread, false, \ 1132 "Disable starting of additional Java threads " \ 1133 "(for debugging only)") \ 1134 \ 1135 develop(bool, MemProfiling, false, \ 1136 "Write memory usage profiling to log file") \ 1137 \ 1138 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1139 "Print the system dictionary at exit") \ 1140 \ 1141 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 1142 "Dynamically resize system dictionaries as needed") \ 1143 \ 1144 product(bool, AlwaysLockClassLoader, false, \ 1145 "Require the VM to acquire the class loader lock before calling " \ 1146 "loadClass() even for class loaders registering " \ 1147 "as parallel capable") \ 1148 \ 1149 product(bool, AllowParallelDefineClass, false, \ 1150 "Allow parallel defineClass requests for class loaders " \ 1151 "registering as parallel capable") \ 1152 \ 1153 product_pd(bool, DontYieldALot, \ 1154 "Throw away obvious excess yield calls") \ 1155 \ 1156 develop(bool, UseDetachedThreads, true, \ 1157 "Use detached threads that are recycled upon termination " \ 1158 "(for Solaris only)") \ 1159 \ 1160 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 1161 "Disable the use of stack guard pages if the JVM is loaded " \ 1162 "on the primordial process thread") \ 1163 \ 1164 product(bool, UseLWPSynchronization, true, \ 1165 "Use LWP-based instead of libthread-based synchronization " \ 1166 "(SPARC only)") \ 1167 \ 1168 experimental(ccstr, SyncKnobs, NULL, \ 1169 "(Unstable) Various monitor synchronization tunables") \ 1170 \ 1171 experimental(intx, EmitSync, 0, \ 1172 "(Unsafe, Unstable) " \ 1173 "Control emission of inline sync fast-path code") \ 1174 \ 1175 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1176 range(0, max_jint) \ 1177 \ 1178 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1179 \ 1180 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 1181 "Percentage of used monitors before triggering cleanup " \ 1182 "safepoint which deflates monitors (0 is off). " \ 1183 "The check is performed on GuaranteedSafepointInterval.") \ 1184 range(0, 100) \ 1185 \ 1186 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1187 "Experimental Sync flags") \ 1188 \ 1189 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1190 \ 1191 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1192 \ 1193 experimental(intx, hashCode, 5, \ 1194 "(Unstable) select hashCode generation algorithm") \ 1195 \ 1196 product(bool, FilterSpuriousWakeups, true, \ 1197 "When true prevents OS-level spurious, or premature, wakeups " \ 1198 "from Object.wait (Ignored for Windows)") \ 1199 \ 1200 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1201 \ 1202 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1203 \ 1204 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1205 \ 1206 develop(bool, UsePthreads, false, \ 1207 "Use pthread-based instead of libthread-based synchronization " \ 1208 "(SPARC only)") \ 1209 \ 1210 product(bool, ReduceSignalUsage, false, \ 1211 "Reduce the use of OS signals in Java and/or the VM") \ 1212 \ 1213 develop_pd(bool, ShareVtableStubs, \ 1214 "Share vtable stubs (smaller code but worse branch prediction") \ 1215 \ 1216 develop(bool, LoadLineNumberTables, true, \ 1217 "Tell whether the class file parser loads line number tables") \ 1218 \ 1219 develop(bool, LoadLocalVariableTables, true, \ 1220 "Tell whether the class file parser loads local variable tables") \ 1221 \ 1222 develop(bool, LoadLocalVariableTypeTables, true, \ 1223 "Tell whether the class file parser loads local variable type" \ 1224 "tables") \ 1225 \ 1226 product(bool, AllowUserSignalHandlers, false, \ 1227 "Do not complain if the application installs signal handlers " \ 1228 "(Solaris & Linux only)") \ 1229 \ 1230 product(bool, UseSignalChaining, true, \ 1231 "Use signal-chaining to invoke signal handlers installed " \ 1232 "by the application (Solaris & Linux only)") \ 1233 \ 1234 product(bool, AllowJNIEnvProxy, false, \ 1235 "Allow JNIEnv proxies for jdbx") \ 1236 \ 1237 product(bool, RestoreMXCSROnJNICalls, false, \ 1238 "Restore MXCSR when returning from JNI calls") \ 1239 \ 1240 product(bool, CheckJNICalls, false, \ 1241 "Verify all arguments to JNI calls") \ 1242 \ 1243 product(bool, CheckEndorsedAndExtDirs, false, \ 1244 "Verify the endorsed and extension directories are not used") \ 1245 \ 1246 product(bool, UseFastJNIAccessors, true, \ 1247 "Use optimized versions of Get<Primitive>Field") \ 1248 \ 1249 product(intx, MaxJNILocalCapacity, 65536, \ 1250 "Maximum allowable local JNI handle capacity to " \ 1251 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1252 "where <= 0 is unlimited, default: 65536") \ 1253 range(min_intx, max_intx) \ 1254 \ 1255 product(bool, EagerXrunInit, false, \ 1256 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1257 "but not all -Xrun libraries may support the state of the VM " \ 1258 "at this time") \ 1259 \ 1260 product(bool, PreserveAllAnnotations, false, \ 1261 "Preserve RuntimeInvisibleAnnotations as well " \ 1262 "as RuntimeVisibleAnnotations") \ 1263 \ 1264 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1265 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1266 \ 1267 product(bool, UseXMMForArrayCopy, false, \ 1268 "Use SSE2 MOVQ instruction for Arraycopy") \ 1269 \ 1270 product(intx, FieldsAllocationStyle, 1, \ 1271 "0 - type based with oops first, " \ 1272 "1 - with oops last, " \ 1273 "2 - oops in super and sub classes are together") \ 1274 range(0, 2) \ 1275 \ 1276 product(bool, CompactFields, true, \ 1277 "Allocate nonstatic fields in gaps between previous fields") \ 1278 \ 1279 notproduct(bool, PrintFieldLayout, false, \ 1280 "Print field layout for each class") \ 1281 \ 1282 /* Need to limit the extent of the padding to reasonable size. */\ 1283 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1284 /* aggressive prefetching, while still leaving the room for segregating */\ 1285 /* among the distinct pages. */\ 1286 product(intx, ContendedPaddingWidth, 128, \ 1287 "How many bytes to pad the fields/classes marked @Contended with")\ 1288 range(0, 8192) \ 1289 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1290 \ 1291 product(bool, EnableContended, true, \ 1292 "Enable @Contended annotation support") \ 1293 \ 1294 product(bool, RestrictContended, true, \ 1295 "Restrict @Contended to trusted classes") \ 1296 \ 1297 product(bool, UseBiasedLocking, true, \ 1298 "Enable biased locking in JVM") \ 1299 \ 1300 product(intx, BiasedLockingStartupDelay, 0, \ 1301 "Number of milliseconds to wait before enabling biased locking") \ 1302 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1303 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1304 \ 1305 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1306 "Print statistics of biased locking in JVM") \ 1307 \ 1308 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1309 "Threshold of number of revocations per type to try to " \ 1310 "rebias all objects in the heap of that type") \ 1311 range(0, max_intx) \ 1312 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1313 \ 1314 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1315 "Threshold of number of revocations per type to permanently " \ 1316 "revoke biases of all objects in the heap of that type") \ 1317 range(0, max_intx) \ 1318 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1319 \ 1320 product(intx, BiasedLockingDecayTime, 25000, \ 1321 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1322 "type after previous bulk rebias") \ 1323 range(500, max_intx) \ 1324 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1325 \ 1326 product(bool, ExitOnOutOfMemoryError, false, \ 1327 "JVM exits on the first occurrence of an out-of-memory error") \ 1328 \ 1329 product(bool, CrashOnOutOfMemoryError, false, \ 1330 "JVM aborts, producing an error log and core/mini dump, on the " \ 1331 "first occurrence of an out-of-memory error") \ 1332 \ 1333 /* tracing */ \ 1334 \ 1335 develop(bool, StressRewriter, false, \ 1336 "Stress linktime bytecode rewriting") \ 1337 \ 1338 product(ccstr, TraceJVMTI, NULL, \ 1339 "Trace flags for JVMTI functions and events") \ 1340 \ 1341 /* This option can change an EMCP method into an obsolete method. */ \ 1342 /* This can affect tests that except specific methods to be EMCP. */ \ 1343 /* This option should be used with caution. */ \ 1344 product(bool, StressLdcRewrite, false, \ 1345 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1346 \ 1347 /* change to false by default sometime after Mustang */ \ 1348 product(bool, VerifyMergedCPBytecodes, true, \ 1349 "Verify bytecodes after RedefineClasses constant pool merging") \ 1350 \ 1351 develop(bool, TraceBytecodes, false, \ 1352 "Trace bytecode execution") \ 1353 \ 1354 develop(bool, TraceICs, false, \ 1355 "Trace inline cache changes") \ 1356 \ 1357 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1358 "Trace method invocation counter overflow") \ 1359 \ 1360 develop(bool, TraceInlineCacheClearing, false, \ 1361 "Trace clearing of inline caches in nmethods") \ 1362 \ 1363 develop(bool, TraceDependencies, false, \ 1364 "Trace dependencies") \ 1365 \ 1366 develop(bool, VerifyDependencies, trueInDebug, \ 1367 "Exercise and verify the compilation dependency mechanism") \ 1368 \ 1369 develop(bool, TraceNewOopMapGeneration, false, \ 1370 "Trace OopMapGeneration") \ 1371 \ 1372 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1373 "Trace OopMapGeneration: print detailed cell states") \ 1374 \ 1375 develop(bool, TimeOopMap, false, \ 1376 "Time calls to GenerateOopMap::compute_map() in sum") \ 1377 \ 1378 develop(bool, TimeOopMap2, false, \ 1379 "Time calls to GenerateOopMap::compute_map() individually") \ 1380 \ 1381 develop(bool, TraceOopMapRewrites, false, \ 1382 "Trace rewriting of method oops during oop map generation") \ 1383 \ 1384 develop(bool, TraceICBuffer, false, \ 1385 "Trace usage of IC buffer") \ 1386 \ 1387 develop(bool, TraceCompiledIC, false, \ 1388 "Trace changes of compiled IC") \ 1389 \ 1390 /* gc */ \ 1391 \ 1392 product(bool, UseSerialGC, false, \ 1393 "Use the Serial garbage collector") \ 1394 \ 1395 product(bool, UseG1GC, false, \ 1396 "Use the Garbage-First garbage collector") \ 1397 \ 1398 product(bool, UseParallelGC, false, \ 1399 "Use the Parallel Scavenge garbage collector") \ 1400 \ 1401 product(bool, UseParallelOldGC, false, \ 1402 "Use the Parallel Old garbage collector") \ 1403 \ 1404 product(uintx, HeapMaximumCompactionInterval, 20, \ 1405 "How often should we maximally compact the heap (not allowing " \ 1406 "any dead space)") \ 1407 range(0, max_uintx) \ 1408 \ 1409 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1410 "The collection count for the first maximum compaction") \ 1411 range(0, max_uintx) \ 1412 \ 1413 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1414 "Use maximum compaction in the Parallel Old garbage collector " \ 1415 "for a system GC") \ 1416 \ 1417 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1418 "The mean used by the parallel compact dead wood " \ 1419 "limiter (a number between 0-100)") \ 1420 range(0, 100) \ 1421 \ 1422 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1423 "The standard deviation used by the parallel compact dead wood " \ 1424 "limiter (a number between 0-100)") \ 1425 range(0, 100) \ 1426 \ 1427 product(uint, ParallelGCThreads, 0, \ 1428 "Number of parallel threads parallel gc will use") \ 1429 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1430 \ 1431 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1432 "Use semaphore synchronization for the GC Threads, " \ 1433 "instead of synchronization based on mutexes") \ 1434 \ 1435 product(bool, UseDynamicNumberOfGCThreads, true, \ 1436 "Dynamically choose the number of threads up to a maximum of " \ 1437 "ParallelGCThreads parallel collectors will use for garbage " \ 1438 "collection work") \ 1439 \ 1440 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1441 "Inject thread creation failures for " \ 1442 "UseDynamicNumberOfGCThreads") \ 1443 \ 1444 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1445 "Force dynamic selection of the number of " \ 1446 "parallel threads parallel gc will use to aid debugging") \ 1447 \ 1448 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1449 "Size of heap (bytes) per GC thread used in calculating the " \ 1450 "number of GC threads") \ 1451 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1452 \ 1453 product(uint, ConcGCThreads, 0, \ 1454 "Number of threads concurrent gc will use") \ 1455 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1456 \ 1457 product(uint, GCTaskTimeStampEntries, 200, \ 1458 "Number of time stamp entries per gc worker thread") \ 1459 range(1, max_jint) \ 1460 \ 1461 product(bool, AlwaysTenure, false, \ 1462 "Always tenure objects in eden (ParallelGC only)") \ 1463 \ 1464 product(bool, NeverTenure, false, \ 1465 "Never tenure objects in eden, may tenure on overflow " \ 1466 "(ParallelGC only)") \ 1467 \ 1468 product(bool, ScavengeBeforeFullGC, true, \ 1469 "Scavenge youngest generation before each full GC.") \ 1470 \ 1471 product(bool, UseConcMarkSweepGC, false, \ 1472 "Use Concurrent Mark-Sweep GC in the old generation") \ 1473 \ 1474 product(bool, ExplicitGCInvokesConcurrent, false, \ 1475 "A System.gc() request invokes a concurrent collection; " \ 1476 "(effective only when using concurrent collectors)") \ 1477 \ 1478 product(bool, GCLockerInvokesConcurrent, false, \ 1479 "The exit of a JNI critical section necessitating a scavenge, " \ 1480 "also kicks off a background concurrent collection") \ 1481 \ 1482 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1483 "How much the GC can expand the eden by while the GC locker " \ 1484 "is active (as a percentage)") \ 1485 range(0, 100) \ 1486 \ 1487 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1488 "Number of times to retry allocations when " \ 1489 "blocked by the GC locker") \ 1490 range(0, max_uintx) \ 1491 \ 1492 product(bool, UseCMSBestFit, true, \ 1493 "Use CMS best fit allocation strategy") \ 1494 \ 1495 product(uintx, ParallelGCBufferWastePct, 10, \ 1496 "Wasted fraction of parallel allocation buffer") \ 1497 range(0, 100) \ 1498 \ 1499 product(uintx, TargetPLABWastePct, 10, \ 1500 "Target wasted space in last buffer as percent of overall " \ 1501 "allocation") \ 1502 range(1, 100) \ 1503 \ 1504 product(uintx, PLABWeight, 75, \ 1505 "Percentage (0-100) used to weight the current sample when " \ 1506 "computing exponentially decaying average for ResizePLAB") \ 1507 range(0, 100) \ 1508 \ 1509 product(bool, ResizePLAB, true, \ 1510 "Dynamically resize (survivor space) promotion LAB's") \ 1511 \ 1512 product(int, ParGCArrayScanChunk, 50, \ 1513 "Scan a subset of object array and push remainder, if array is " \ 1514 "bigger than this") \ 1515 range(1, max_jint/3) \ 1516 \ 1517 product(bool, ParGCUseLocalOverflow, false, \ 1518 "Instead of a global overflow list, use local overflow stacks") \ 1519 \ 1520 product(bool, ParGCTrimOverflow, true, \ 1521 "Eagerly trim the local overflow lists " \ 1522 "(when ParGCUseLocalOverflow)") \ 1523 \ 1524 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1525 "Simulate work queue overflow in ParNew") \ 1526 \ 1527 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1528 "An `interval' counter that determines how frequently " \ 1529 "we simulate overflow; a smaller number increases frequency") \ 1530 \ 1531 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1532 "The desired number of objects to claim from the overflow list") \ 1533 range(0, max_uintx) \ 1534 \ 1535 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1536 "The number of strides per worker thread that we divide up the " \ 1537 "card table scanning work into") \ 1538 range(1, max_uintx) \ 1539 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1540 \ 1541 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1542 "The number of cards in each chunk of the parallel chunks used " \ 1543 "during card table scanning") \ 1544 range(1, max_intx) \ 1545 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1546 \ 1547 product(uintx, OldPLABWeight, 50, \ 1548 "Percentage (0-100) used to weight the current sample when " \ 1549 "computing exponentially decaying average for resizing " \ 1550 "OldPLABSize") \ 1551 range(0, 100) \ 1552 \ 1553 product(bool, ResizeOldPLAB, true, \ 1554 "Dynamically resize (old gen) promotion LAB's") \ 1555 \ 1556 product(size_t, CMSOldPLABMax, 1024, \ 1557 "Maximum size of CMS gen promotion LAB caches per worker " \ 1558 "per block size") \ 1559 range(1, max_uintx) \ 1560 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1561 \ 1562 product(size_t, CMSOldPLABMin, 16, \ 1563 "Minimum size of CMS gen promotion LAB caches per worker " \ 1564 "per block size") \ 1565 range(1, max_uintx) \ 1566 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1567 \ 1568 product(uintx, CMSOldPLABNumRefills, 4, \ 1569 "Nominal number of refills of CMS gen promotion LAB cache " \ 1570 "per worker per block size") \ 1571 range(1, max_uintx) \ 1572 \ 1573 product(bool, CMSOldPLABResizeQuicker, false, \ 1574 "React on-the-fly during a scavenge to a sudden " \ 1575 "change in block demand rate") \ 1576 \ 1577 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1578 "The tolerance of the phase-change detector for on-the-fly " \ 1579 "PLAB resizing during a scavenge") \ 1580 range(1, max_uintx) \ 1581 \ 1582 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1583 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1584 "during a scavenge") \ 1585 range(1, max_uintx) \ 1586 \ 1587 product(bool, AlwaysPreTouch, false, \ 1588 "Force all freshly committed pages to be pre-touched") \ 1589 \ 1590 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1591 "Per-thread chunk size for parallel memory pre-touch.") \ 1592 range(1, SIZE_MAX / 2) \ 1593 \ 1594 product_pd(size_t, CMSYoungGenPerWorker, \ 1595 "The maximum size of young gen chosen by default per GC worker " \ 1596 "thread available") \ 1597 range(1, max_uintx) \ 1598 \ 1599 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1600 "Percentage (0-100) used to add conservatism when computing the " \ 1601 "duty cycle") \ 1602 range(0, 100) \ 1603 \ 1604 product(uintx, CMSExpAvgFactor, 50, \ 1605 "Percentage (0-100) used to weight the current sample when " \ 1606 "computing exponential averages for CMS statistics") \ 1607 range(0, 100) \ 1608 \ 1609 product(uintx, CMS_FLSWeight, 75, \ 1610 "Percentage (0-100) used to weight the current sample when " \ 1611 "computing exponentially decaying averages for CMS FLS " \ 1612 "statistics") \ 1613 range(0, 100) \ 1614 \ 1615 product(uintx, CMS_FLSPadding, 1, \ 1616 "The multiple of deviation from mean to use for buffering " \ 1617 "against volatility in free list demand") \ 1618 range(0, max_juint) \ 1619 \ 1620 product(uintx, FLSCoalescePolicy, 2, \ 1621 "CMS: aggressiveness level for coalescing, increasing " \ 1622 "from 0 to 4") \ 1623 range(0, 4) \ 1624 \ 1625 product(bool, FLSAlwaysCoalesceLarge, false, \ 1626 "CMS: larger free blocks are always available for coalescing") \ 1627 \ 1628 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1629 "CMS: the smaller the percentage the greater the coalescing " \ 1630 "force") \ 1631 range(0.0, 1.0) \ 1632 \ 1633 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1634 "CMS: the factor by which to inflate estimated demand of small " \ 1635 "block sizes to prevent coalescing with an adjoining block") \ 1636 range(0.0, DBL_MAX) \ 1637 \ 1638 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1639 "CMS: the factor by which to inflate estimated demand of large " \ 1640 "block sizes to prevent coalescing with an adjoining block") \ 1641 range(0.0, DBL_MAX) \ 1642 \ 1643 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1644 "CMS: the factor by which to inflate estimated demand of small " \ 1645 "block sizes to prevent splitting to supply demand for smaller " \ 1646 "blocks") \ 1647 range(0.0, DBL_MAX) \ 1648 \ 1649 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1650 "CMS: the factor by which to inflate estimated demand of large " \ 1651 "block sizes to prevent splitting to supply demand for smaller " \ 1652 "blocks") \ 1653 range(0.0, DBL_MAX) \ 1654 \ 1655 product(bool, CMSExtrapolateSweep, false, \ 1656 "CMS: cushion for block demand during sweep") \ 1657 \ 1658 product(uintx, CMS_SweepWeight, 75, \ 1659 "Percentage (0-100) used to weight the current sample when " \ 1660 "computing exponentially decaying average for inter-sweep " \ 1661 "duration") \ 1662 range(0, 100) \ 1663 \ 1664 product(uintx, CMS_SweepPadding, 1, \ 1665 "The multiple of deviation from mean to use for buffering " \ 1666 "against volatility in inter-sweep duration") \ 1667 range(0, max_juint) \ 1668 \ 1669 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1670 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1671 "duration exceeds this threshold in milliseconds") \ 1672 range(0, max_uintx) \ 1673 \ 1674 product(bool, CMSClassUnloadingEnabled, true, \ 1675 "Whether class unloading enabled when using CMS GC") \ 1676 \ 1677 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1678 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1679 "count for which classes may not be unloaded") \ 1680 range(0, max_uintx) \ 1681 \ 1682 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1683 "Replenish an indexed free list with this number of chunks") \ 1684 range(1, max_uintx) \ 1685 \ 1686 product(bool, CMSReplenishIntermediate, true, \ 1687 "Replenish all intermediate free-list caches") \ 1688 \ 1689 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1690 "When satisfying batched demand, split blocks from the " \ 1691 "IndexedFreeList whose size is a multiple of requested size") \ 1692 \ 1693 product(bool, CMSLoopWarn, false, \ 1694 "Warn in case of excessive CMS looping") \ 1695 \ 1696 /* where does the range max value of (max_jint - 1) come from? */ \ 1697 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1698 "Maximum size of marking stack") \ 1699 range(1, (max_jint - 1)) \ 1700 \ 1701 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1702 "Size of marking stack") \ 1703 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1704 \ 1705 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1706 "Simulate frequent marking stack / work queue overflow") \ 1707 \ 1708 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1709 "An \"interval\" counter that determines how frequently " \ 1710 "to simulate overflow; a smaller number increases frequency") \ 1711 \ 1712 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1713 "Maximum number of abortable preclean iterations, if > 0") \ 1714 range(0, max_uintx) \ 1715 \ 1716 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1717 "Maximum time in abortable preclean (in milliseconds)") \ 1718 range(0, max_intx) \ 1719 \ 1720 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1721 "Nominal minimum work per abortable preclean iteration") \ 1722 range(0, max_uintx) \ 1723 \ 1724 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1725 "Time that we sleep between iterations when not given " \ 1726 "enough work per iteration") \ 1727 range(0, max_intx) \ 1728 \ 1729 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \ 1730 product(size_t, CMSRescanMultiple, 32, \ 1731 "Size (in cards) of CMS parallel rescan task") \ 1732 range(1, SIZE_MAX / 4096) \ 1733 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1734 \ 1735 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \ 1736 product(size_t, CMSConcMarkMultiple, 32, \ 1737 "Size (in cards) of CMS concurrent MT marking task") \ 1738 range(1, SIZE_MAX / 4096) \ 1739 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1740 \ 1741 product(bool, CMSAbortSemantics, false, \ 1742 "Whether abort-on-overflow semantics is implemented") \ 1743 \ 1744 product(bool, CMSParallelInitialMarkEnabled, true, \ 1745 "Use the parallel initial mark.") \ 1746 \ 1747 product(bool, CMSParallelRemarkEnabled, true, \ 1748 "Whether parallel remark enabled (only if ParNewGC)") \ 1749 \ 1750 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1751 "Whether parallel remark of survivor space " \ 1752 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1753 \ 1754 product(bool, CMSPLABRecordAlways, true, \ 1755 "Always record survivor space PLAB boundaries (effective only " \ 1756 "if CMSParallelSurvivorRemarkEnabled)") \ 1757 \ 1758 product(bool, CMSEdenChunksRecordAlways, true, \ 1759 "Always record eden chunks used for the parallel initial mark " \ 1760 "or remark of eden") \ 1761 \ 1762 product(bool, CMSConcurrentMTEnabled, true, \ 1763 "Whether multi-threaded concurrent work enabled " \ 1764 "(effective only if ParNewGC)") \ 1765 \ 1766 product(bool, CMSPrecleaningEnabled, true, \ 1767 "Whether concurrent precleaning enabled") \ 1768 \ 1769 product(uintx, CMSPrecleanIter, 3, \ 1770 "Maximum number of precleaning iteration passes") \ 1771 range(0, 9) \ 1772 \ 1773 product(uintx, CMSPrecleanDenominator, 3, \ 1774 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1775 "ratio") \ 1776 range(1, max_uintx) \ 1777 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1778 \ 1779 product(uintx, CMSPrecleanNumerator, 2, \ 1780 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1781 "ratio") \ 1782 range(0, max_uintx-1) \ 1783 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1784 \ 1785 product(bool, CMSPrecleanRefLists1, true, \ 1786 "Preclean ref lists during (initial) preclean phase") \ 1787 \ 1788 product(bool, CMSPrecleanRefLists2, false, \ 1789 "Preclean ref lists during abortable preclean phase") \ 1790 \ 1791 product(bool, CMSPrecleanSurvivors1, false, \ 1792 "Preclean survivors during (initial) preclean phase") \ 1793 \ 1794 product(bool, CMSPrecleanSurvivors2, true, \ 1795 "Preclean survivors during abortable preclean phase") \ 1796 \ 1797 product(uintx, CMSPrecleanThreshold, 1000, \ 1798 "Do not iterate again if number of dirty cards is less than this")\ 1799 range(100, max_uintx) \ 1800 \ 1801 product(bool, CMSCleanOnEnter, true, \ 1802 "Clean-on-enter optimization for reducing number of dirty cards") \ 1803 \ 1804 product(uintx, CMSRemarkVerifyVariant, 1, \ 1805 "Choose variant (1,2) of verification following remark") \ 1806 range(1, 2) \ 1807 \ 1808 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1809 "If Eden size is below this, do not try to schedule remark") \ 1810 range(0, max_uintx) \ 1811 \ 1812 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1813 "The Eden occupancy percentage (0-100) at which " \ 1814 "to try and schedule remark pause") \ 1815 range(0, 100) \ 1816 \ 1817 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1818 "Start sampling eden top at least before young gen " \ 1819 "occupancy reaches 1/<ratio> of the size at which " \ 1820 "we plan to schedule remark") \ 1821 range(1, max_uintx) \ 1822 \ 1823 product(uintx, CMSSamplingGrain, 16*K, \ 1824 "The minimum distance between eden samples for CMS (see above)") \ 1825 range(ObjectAlignmentInBytes, max_uintx) \ 1826 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1827 \ 1828 product(bool, CMSScavengeBeforeRemark, false, \ 1829 "Attempt scavenge before the CMS remark step") \ 1830 \ 1831 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1832 "Don't drain below this size per parallel worker/thief") \ 1833 range(1, max_juint) \ 1834 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1835 \ 1836 manageable(intx, CMSWaitDuration, 2000, \ 1837 "Time in milliseconds that CMS thread waits for young GC") \ 1838 range(min_jint, max_jint) \ 1839 \ 1840 develop(uintx, CMSCheckInterval, 1000, \ 1841 "Interval in milliseconds that CMS thread checks if it " \ 1842 "should start a collection cycle") \ 1843 \ 1844 product(bool, CMSYield, true, \ 1845 "Yield between steps of CMS") \ 1846 \ 1847 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1848 "Bitmap operations should process at most this many bits " \ 1849 "between yields") \ 1850 range(1, max_uintx) \ 1851 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1852 \ 1853 product(bool, CMSPrintChunksInDump, false, \ 1854 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1855 "trace level include more detailed information about the" \ 1856 "free chunks") \ 1857 \ 1858 product(bool, CMSPrintObjectsInDump, false, \ 1859 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1860 "trace level include more detailed information about the" \ 1861 "allocated objects") \ 1862 \ 1863 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1864 "Verify that all references across the FLS boundary " \ 1865 "are to valid objects") \ 1866 \ 1867 diagnostic(bool, FLSVerifyLists, false, \ 1868 "Do lots of (expensive) FreeListSpace verification") \ 1869 \ 1870 diagnostic(bool, FLSVerifyIndexTable, false, \ 1871 "Do lots of (expensive) FLS index table verification") \ 1872 \ 1873 develop(bool, FLSVerifyDictionary, false, \ 1874 "Do lots of (expensive) FLS dictionary verification") \ 1875 \ 1876 develop(bool, VerifyBlockOffsetArray, false, \ 1877 "Do (expensive) block offset array verification") \ 1878 \ 1879 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1880 "Maintain _unallocated_block in BlockOffsetArray " \ 1881 "(currently applicable only to CMS collector)") \ 1882 \ 1883 product(intx, RefDiscoveryPolicy, 0, \ 1884 "Select type of reference discovery policy: " \ 1885 "reference-based(0) or referent-based(1)") \ 1886 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1887 ReferenceProcessor::DiscoveryPolicyMax) \ 1888 \ 1889 product(bool, ParallelRefProcEnabled, false, \ 1890 "Enable parallel reference processing whenever possible") \ 1891 \ 1892 product(bool, ParallelRefProcBalancingEnabled, true, \ 1893 "Enable balancing of reference processing queues") \ 1894 \ 1895 product(uintx, CMSTriggerRatio, 80, \ 1896 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1897 "allocated before a CMS collection cycle commences") \ 1898 range(0, 100) \ 1899 \ 1900 product(uintx, CMSBootstrapOccupancy, 50, \ 1901 "Percentage CMS generation occupancy at which to " \ 1902 "initiate CMS collection for bootstrapping collection stats") \ 1903 range(0, 100) \ 1904 \ 1905 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1906 "Percentage CMS generation occupancy to start a CMS collection " \ 1907 "cycle. A negative value means that CMSTriggerRatio is used") \ 1908 range(min_intx, 100) \ 1909 \ 1910 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1911 "The percent occupancy (IHOP) of the current old generation " \ 1912 "capacity above which a concurrent mark cycle will be initiated " \ 1913 "Its value may change over time if adaptive IHOP is enabled, " \ 1914 "otherwise the value remains constant. " \ 1915 "In the latter case a value of 0 will result as frequent as " \ 1916 "possible concurrent marking cycles. A value of 100 disables " \ 1917 "concurrent marking. " \ 1918 "Fragmentation waste in the old generation is not considered " \ 1919 "free space in this calculation. (G1 collector only)") \ 1920 range(0, 100) \ 1921 \ 1922 manageable(intx, CMSTriggerInterval, -1, \ 1923 "Commence a CMS collection cycle (at least) every so many " \ 1924 "milliseconds (0 permanently, -1 disabled)") \ 1925 range(-1, max_intx) \ 1926 \ 1927 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1928 "Only use occupancy as a criterion for starting a CMS collection")\ 1929 \ 1930 product(uintx, CMSIsTooFullPercentage, 98, \ 1931 "An absolute ceiling above which CMS will always consider the " \ 1932 "unloading of classes when class unloading is enabled") \ 1933 range(0, 100) \ 1934 \ 1935 develop(bool, CMSTestInFreeList, false, \ 1936 "Check if the coalesced range is already in the " \ 1937 "free lists as claimed") \ 1938 \ 1939 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1940 "Check that all the garbage collected was returned to the " \ 1941 "free lists") \ 1942 \ 1943 notproduct(bool, ScavengeALot, false, \ 1944 "Force scavenge at every Nth exit from the runtime system " \ 1945 "(N=ScavengeALotInterval)") \ 1946 \ 1947 develop(bool, FullGCALot, false, \ 1948 "Force full gc at every Nth exit from the runtime system " \ 1949 "(N=FullGCALotInterval)") \ 1950 \ 1951 notproduct(bool, GCALotAtAllSafepoints, false, \ 1952 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1953 \ 1954 notproduct(bool, PromotionFailureALot, false, \ 1955 "Use promotion failure handling on every youngest generation " \ 1956 "collection") \ 1957 \ 1958 develop(uintx, PromotionFailureALotCount, 1000, \ 1959 "Number of promotion failures occurring at PLAB " \ 1960 "refill attempts (ParNew) or promotion attempts " \ 1961 "(other young collectors)") \ 1962 \ 1963 develop(uintx, PromotionFailureALotInterval, 5, \ 1964 "Total collections between promotion failures a lot") \ 1965 \ 1966 experimental(uintx, WorkStealingSleepMillis, 1, \ 1967 "Sleep time when sleep is used for yields") \ 1968 \ 1969 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1970 "Number of yields before a sleep is done during work stealing") \ 1971 \ 1972 experimental(uintx, WorkStealingHardSpins, 4096, \ 1973 "Number of iterations in a spin loop between checks on " \ 1974 "time out of hard spin") \ 1975 \ 1976 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1977 "Ratio of hard spins to calls to yield") \ 1978 \ 1979 develop(uintx, ObjArrayMarkingStride, 2048, \ 1980 "Number of object array elements to push onto the marking stack " \ 1981 "before pushing a continuation entry") \ 1982 \ 1983 develop(bool, MetadataAllocationFailALot, false, \ 1984 "Fail metadata allocations at intervals controlled by " \ 1985 "MetadataAllocationFailALotInterval") \ 1986 \ 1987 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1988 "Metadata allocation failure a lot interval") \ 1989 \ 1990 notproduct(bool, ExecuteInternalVMTests, false, \ 1991 "Enable execution of internal VM tests") \ 1992 \ 1993 notproduct(bool, VerboseInternalVMTests, false, \ 1994 "Turn on logging for internal VM tests.") \ 1995 \ 1996 product(bool, ExecutingUnitTests, false, \ 1997 "Whether the JVM is running unit tests or not") \ 1998 \ 1999 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2000 \ 2001 product_pd(bool, ResizeTLAB, \ 2002 "Dynamically resize TLAB size for threads") \ 2003 \ 2004 product(bool, ZeroTLAB, false, \ 2005 "Zero out the newly created TLAB") \ 2006 \ 2007 product(bool, TLABStats, true, \ 2008 "Provide more detailed and expensive TLAB statistics.") \ 2009 \ 2010 product_pd(bool, NeverActAsServerClassMachine, \ 2011 "Never act like a server-class machine") \ 2012 \ 2013 product(bool, AlwaysActAsServerClassMachine, false, \ 2014 "Always act like a server-class machine") \ 2015 \ 2016 product_pd(uint64_t, MaxRAM, \ 2017 "Real memory size (in bytes) used to set maximum heap size") \ 2018 range(0, 0XFFFFFFFFFFFFFFFF) \ 2019 \ 2020 product(bool, AggressiveHeap, false, \ 2021 "Optimize heap options for long-running memory intensive apps") \ 2022 \ 2023 product(size_t, ErgoHeapSizeLimit, 0, \ 2024 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2025 "MaxRAM * MaxRAMPercentage / 100") \ 2026 range(0, max_uintx) \ 2027 \ 2028 product(uintx, MaxRAMFraction, 4, \ 2029 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2030 "size. " \ 2031 "Deprecated, use MaxRAMPercentage instead") \ 2032 range(1, max_uintx) \ 2033 \ 2034 product(uintx, MinRAMFraction, 2, \ 2035 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2036 "size on systems with small physical memory size. " \ 2037 "Deprecated, use MinRAMPercentage instead") \ 2038 range(1, max_uintx) \ 2039 \ 2040 product(uintx, InitialRAMFraction, 64, \ 2041 "Fraction (1/n) of real memory used for initial heap size. " \ 2042 "Deprecated, use InitialRAMPercentage instead") \ 2043 range(1, max_uintx) \ 2044 \ 2045 product(double, MaxRAMPercentage, 25.0, \ 2046 "Maximum percentage of real memory used for maximum heap size") \ 2047 range(0.0, 100.0) \ 2048 \ 2049 product(double, MinRAMPercentage, 50.0, \ 2050 "Minimum percentage of real memory used for maximum heap" \ 2051 "size on systems with small physical memory size") \ 2052 range(0.0, 100.0) \ 2053 \ 2054 product(double, InitialRAMPercentage, 1.5625, \ 2055 "Percentage of real memory used for initial heap size") \ 2056 range(0.0, 100.0) \ 2057 \ 2058 product(int, ActiveProcessorCount, -1, \ 2059 "Specify the CPU count the VM should use and report as active") \ 2060 \ 2061 develop(uintx, MaxVirtMemFraction, 2, \ 2062 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2063 "determining maximum heap size") \ 2064 \ 2065 product(bool, UseAdaptiveSizePolicy, true, \ 2066 "Use adaptive generation sizing policies") \ 2067 \ 2068 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2069 "Use adaptive survivor sizing policies") \ 2070 \ 2071 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2072 "Use adaptive young-old sizing policies at minor collections") \ 2073 \ 2074 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2075 "Use adaptive young-old sizing policies at major collections") \ 2076 \ 2077 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2078 "Include statistics from System.gc() for adaptive size policy") \ 2079 \ 2080 product(bool, UseAdaptiveGCBoundary, false, \ 2081 "Allow young-old boundary to move") \ 2082 \ 2083 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2084 "Resize the virtual spaces of the young or old generations") \ 2085 range(-1, 1) \ 2086 \ 2087 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2088 "Policy for changing generation size for throughput goals") \ 2089 range(0, 1) \ 2090 \ 2091 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2092 "Number of steps where heuristics is used before data is used") \ 2093 range(0, max_uintx) \ 2094 \ 2095 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2096 "Number of collections before the adaptive sizing is started") \ 2097 \ 2098 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2099 "Collection interval for printing information; zero means never") \ 2100 range(0, max_uintx) \ 2101 \ 2102 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2103 "Use adaptive minimum footprint as a goal") \ 2104 \ 2105 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2106 "Weight given to exponential resizing, between 0 and 100") \ 2107 range(0, 100) \ 2108 \ 2109 product(uintx, AdaptiveTimeWeight, 25, \ 2110 "Weight given to time in adaptive policy, between 0 and 100") \ 2111 range(0, 100) \ 2112 \ 2113 product(uintx, PausePadding, 1, \ 2114 "How much buffer to keep for pause time") \ 2115 range(0, max_juint) \ 2116 \ 2117 product(uintx, PromotedPadding, 3, \ 2118 "How much buffer to keep for promotion failure") \ 2119 range(0, max_juint) \ 2120 \ 2121 product(uintx, SurvivorPadding, 3, \ 2122 "How much buffer to keep for survivor overflow") \ 2123 range(0, max_juint) \ 2124 \ 2125 product(uintx, ThresholdTolerance, 10, \ 2126 "Allowed collection cost difference between generations") \ 2127 range(0, 100) \ 2128 \ 2129 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2130 "If collection costs are within margin, reduce both by full " \ 2131 "delta") \ 2132 range(0, 100) \ 2133 \ 2134 product(uintx, YoungGenerationSizeIncrement, 20, \ 2135 "Adaptive size percentage change in young generation") \ 2136 range(0, 100) \ 2137 \ 2138 product(uintx, YoungGenerationSizeSupplement, 80, \ 2139 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2140 range(0, 100) \ 2141 \ 2142 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2143 "Decay factor to YoungedGenerationSizeSupplement") \ 2144 range(1, max_uintx) \ 2145 \ 2146 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2147 "Adaptive size percentage change in tenured generation") \ 2148 range(0, 100) \ 2149 \ 2150 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2151 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2152 range(0, 100) \ 2153 \ 2154 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2155 "Decay factor to TenuredGenerationSizeIncrement") \ 2156 range(1, max_uintx) \ 2157 \ 2158 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2159 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2160 "or (G1 Only) the maximum GC time per MMU time slice") \ 2161 range(1, max_uintx - 1) \ 2162 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2163 \ 2164 product(uintx, GCPauseIntervalMillis, 0, \ 2165 "Time slice for MMU specification") \ 2166 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2167 \ 2168 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2169 "Adaptive size policy maximum GC minor pause time goal " \ 2170 "in millisecond") \ 2171 range(0, max_uintx) \ 2172 \ 2173 product(uintx, GCTimeRatio, 99, \ 2174 "Adaptive size policy application time to GC time ratio") \ 2175 range(0, max_juint) \ 2176 \ 2177 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2178 "Adaptive size scale down factor for shrinking") \ 2179 range(1, max_uintx) \ 2180 \ 2181 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2182 "Adaptive size decays the major cost for long major intervals") \ 2183 \ 2184 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2185 "Time scale over which major costs decay") \ 2186 range(0, max_uintx) \ 2187 \ 2188 product(uintx, MinSurvivorRatio, 3, \ 2189 "Minimum ratio of young generation/survivor space size") \ 2190 range(3, max_uintx) \ 2191 \ 2192 product(uintx, InitialSurvivorRatio, 8, \ 2193 "Initial ratio of young generation/survivor space size") \ 2194 range(0, max_uintx) \ 2195 \ 2196 product(size_t, BaseFootPrintEstimate, 256*M, \ 2197 "Estimate of footprint other than Java Heap") \ 2198 range(0, max_uintx) \ 2199 \ 2200 product(bool, UseGCOverheadLimit, true, \ 2201 "Use policy to limit of proportion of time spent in GC " \ 2202 "before an OutOfMemory error is thrown") \ 2203 \ 2204 product(uintx, GCTimeLimit, 98, \ 2205 "Limit of the proportion of time spent in GC before " \ 2206 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2207 range(0, 100) \ 2208 \ 2209 product(uintx, GCHeapFreeLimit, 2, \ 2210 "Minimum percentage of free space after a full GC before an " \ 2211 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2212 range(0, 100) \ 2213 \ 2214 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2215 "Number of consecutive collections before gc time limit fires") \ 2216 range(1, max_uintx) \ 2217 \ 2218 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2219 "How far ahead to prefetch destination area (<= 0 means off)") \ 2220 range(-1, max_jint) \ 2221 \ 2222 product(intx, PrefetchScanIntervalInBytes, -1, \ 2223 "How far ahead to prefetch scan area (<= 0 means off)") \ 2224 range(-1, max_jint) \ 2225 \ 2226 product(intx, PrefetchFieldsAhead, -1, \ 2227 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2228 range(-1, max_jint) \ 2229 \ 2230 diagnostic(bool, VerifyDuringStartup, false, \ 2231 "Verify memory system before executing any Java code " \ 2232 "during VM initialization") \ 2233 \ 2234 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2235 "Verify system before exiting") \ 2236 \ 2237 diagnostic(bool, VerifyBeforeGC, false, \ 2238 "Verify memory system before GC") \ 2239 \ 2240 diagnostic(bool, VerifyAfterGC, false, \ 2241 "Verify memory system after GC") \ 2242 \ 2243 diagnostic(bool, VerifyDuringGC, false, \ 2244 "Verify memory system during GC (between phases)") \ 2245 \ 2246 diagnostic(ccstrlist, VerifyGCType, "", \ 2247 "GC type(s) to verify when Verify*GC is enabled." \ 2248 "Available types are collector specific.") \ 2249 \ 2250 diagnostic(ccstrlist, VerifySubSet, "", \ 2251 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2252 "are enabled. One or more sub-systems can be specified " \ 2253 "in a comma separated string. Sub-systems are: " \ 2254 "threads, heap, symbol_table, string_table, codecache, " \ 2255 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2256 "codecache_oops") \ 2257 \ 2258 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2259 "Enable parallel memory system verification") \ 2260 \ 2261 diagnostic(bool, DeferInitialCardMark, false, \ 2262 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2263 "may arise from new_pre_store_barrier") \ 2264 \ 2265 product(bool, UseCondCardMark, false, \ 2266 "Check for already marked card before updating card table") \ 2267 \ 2268 diagnostic(bool, VerifyRememberedSets, false, \ 2269 "Verify GC remembered sets") \ 2270 \ 2271 diagnostic(bool, VerifyObjectStartArray, true, \ 2272 "Verify GC object start array if verify before/after") \ 2273 \ 2274 product(bool, DisableExplicitGC, false, \ 2275 "Ignore calls to System.gc()") \ 2276 \ 2277 notproduct(bool, CheckMemoryInitialization, false, \ 2278 "Check memory initialization") \ 2279 \ 2280 diagnostic(bool, BindCMSThreadToCPU, false, \ 2281 "Bind CMS Thread to CPU if possible") \ 2282 \ 2283 diagnostic(uintx, CPUForCMSThread, 0, \ 2284 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2285 range(0, max_juint) \ 2286 \ 2287 product(bool, BindGCTaskThreadsToCPUs, false, \ 2288 "Bind GCTaskThreads to CPUs if possible") \ 2289 \ 2290 product(bool, UseGCTaskAffinity, false, \ 2291 "Use worker affinity when asking for GCTasks") \ 2292 \ 2293 product(uintx, ProcessDistributionStride, 4, \ 2294 "Stride through processors when distributing processes") \ 2295 range(0, max_juint) \ 2296 \ 2297 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2298 "Number of times the coordinator GC thread will sleep while " \ 2299 "yielding before giving up and resuming GC") \ 2300 range(0, max_juint) \ 2301 \ 2302 product(uintx, CMSYieldSleepCount, 0, \ 2303 "Number of times a GC thread (minus the coordinator) " \ 2304 "will sleep while yielding before giving up and resuming GC") \ 2305 range(0, max_juint) \ 2306 \ 2307 product(bool, PrintGC, false, \ 2308 "Print message at garbage collection. " \ 2309 "Deprecated, use -Xlog:gc instead.") \ 2310 \ 2311 product(bool, PrintGCDetails, false, \ 2312 "Print more details at garbage collection. " \ 2313 "Deprecated, use -Xlog:gc* instead.") \ 2314 \ 2315 develop(intx, ConcGCYieldTimeout, 0, \ 2316 "If non-zero, assert that GC threads yield within this " \ 2317 "number of milliseconds") \ 2318 range(0, max_intx) \ 2319 \ 2320 develop(bool, TraceFinalizerRegistration, false, \ 2321 "Trace registration of final references") \ 2322 \ 2323 notproduct(bool, TraceScavenge, false, \ 2324 "Trace scavenge") \ 2325 \ 2326 product(bool, IgnoreEmptyClassPaths, false, \ 2327 "Ignore empty path elements in -classpath") \ 2328 \ 2329 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2330 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2331 "Initial size of the boot class loader data metaspace") \ 2332 range(30*K, max_uintx/BytesPerWord) \ 2333 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2334 \ 2335 product(bool, PrintHeapAtSIGBREAK, true, \ 2336 "Print heap layout in response to SIGBREAK") \ 2337 \ 2338 manageable(bool, PrintClassHistogram, false, \ 2339 "Print a histogram of class instances") \ 2340 \ 2341 develop(bool, TraceGCTaskManager, false, \ 2342 "Trace actions of the GC task manager") \ 2343 \ 2344 develop(bool, TraceGCTaskQueue, false, \ 2345 "Trace actions of the GC task queues") \ 2346 \ 2347 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2348 "Trace marking phase in ParallelOldGC") \ 2349 \ 2350 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2351 "Trace dense prefix computation for ParallelOldGC") \ 2352 \ 2353 develop(bool, IgnoreLibthreadGPFault, false, \ 2354 "Suppress workaround for libthread GP fault") \ 2355 \ 2356 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2357 "The percentage of the used heap that the instances of a class " \ 2358 "must occupy for the class to generate a trace event") \ 2359 range(0.0, 100.0) \ 2360 \ 2361 /* JVMTI heap profiling */ \ 2362 \ 2363 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2364 "Trace JVMTI object tagging calls") \ 2365 \ 2366 diagnostic(bool, VerifyBeforeIteration, false, \ 2367 "Verify memory system before JVMTI iteration") \ 2368 \ 2369 /* compiler interface */ \ 2370 \ 2371 develop(bool, CIPrintCompilerName, false, \ 2372 "when CIPrint is active, print the name of the active compiler") \ 2373 \ 2374 diagnostic(bool, CIPrintCompileQueue, false, \ 2375 "display the contents of the compile queue whenever a " \ 2376 "compilation is enqueued") \ 2377 \ 2378 develop(bool, CIPrintRequests, false, \ 2379 "display every request for compilation") \ 2380 \ 2381 product(bool, CITime, false, \ 2382 "collect timing information for compilation") \ 2383 \ 2384 develop(bool, CITimeVerbose, false, \ 2385 "be more verbose in compilation timings") \ 2386 \ 2387 develop(bool, CITimeEach, false, \ 2388 "display timing information after each successful compilation") \ 2389 \ 2390 develop(bool, CICountOSR, false, \ 2391 "use a separate counter when assigning ids to osr compilations") \ 2392 \ 2393 develop(bool, CICompileNatives, true, \ 2394 "compile native methods if supported by the compiler") \ 2395 \ 2396 develop_pd(bool, CICompileOSR, \ 2397 "compile on stack replacement methods if supported by the " \ 2398 "compiler") \ 2399 \ 2400 develop(bool, CIPrintMethodCodes, false, \ 2401 "print method bytecodes of the compiled code") \ 2402 \ 2403 develop(bool, CIPrintTypeFlow, false, \ 2404 "print the results of ciTypeFlow analysis") \ 2405 \ 2406 develop(bool, CITraceTypeFlow, false, \ 2407 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2408 \ 2409 develop(intx, OSROnlyBCI, -1, \ 2410 "OSR only at this bci. Negative values mean exclude that bci") \ 2411 \ 2412 /* compiler */ \ 2413 \ 2414 /* notice: the max range value here is max_jint, not max_intx */ \ 2415 /* because of overflow issue */ \ 2416 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2417 "Number of compiler threads to run") \ 2418 range(0, max_jint) \ 2419 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2420 \ 2421 product(intx, CompilationPolicyChoice, 0, \ 2422 "which compilation policy (0-3)") \ 2423 range(0, 3) \ 2424 \ 2425 develop(bool, UseStackBanging, true, \ 2426 "use stack banging for stack overflow checks (required for " \ 2427 "proper StackOverflow handling; disable only to measure cost " \ 2428 "of stackbanging)") \ 2429 \ 2430 develop(bool, UseStrictFP, true, \ 2431 "use strict fp if modifier strictfp is set") \ 2432 \ 2433 develop(bool, GenerateSynchronizationCode, true, \ 2434 "generate locking/unlocking code for synchronized methods and " \ 2435 "monitors") \ 2436 \ 2437 develop(bool, GenerateRangeChecks, true, \ 2438 "Generate range checks for array accesses") \ 2439 \ 2440 diagnostic_pd(bool, ImplicitNullChecks, \ 2441 "Generate code for implicit null checks") \ 2442 \ 2443 product_pd(bool, TrapBasedNullChecks, \ 2444 "Generate code for null checks that uses a cmp and trap " \ 2445 "instruction raising SIGTRAP. This is only used if an access to" \ 2446 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2447 "ImplicitNullChecks don't work (PPC64).") \ 2448 \ 2449 product(bool, PrintSafepointStatistics, false, \ 2450 "(Deprecated) Print statistics about safepoint synchronization") \ 2451 \ 2452 product(intx, PrintSafepointStatisticsCount, 300, \ 2453 "(Deprecated) Total number of safepoint statistics collected " \ 2454 "before printing them out") \ 2455 range(1, max_intx) \ 2456 \ 2457 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2458 "(Deprecated) Print safepoint statistics only when safepoint takes " \ 2459 "more than PrintSafepointSatisticsTimeout in millis") \ 2460 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2461 NOT_LP64(range(-1, max_intx)) \ 2462 \ 2463 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 2464 "Enable Thread SMR extra validity checks") \ 2465 \ 2466 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 2467 "Enable Thread SMR Statistics") \ 2468 \ 2469 product(bool, Inline, true, \ 2470 "Enable inlining") \ 2471 \ 2472 product(bool, ClipInlining, true, \ 2473 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2474 \ 2475 develop(bool, UseCHA, true, \ 2476 "Enable CHA") \ 2477 \ 2478 product(bool, UseTypeProfile, true, \ 2479 "Check interpreter profile for historically monomorphic calls") \ 2480 \ 2481 diagnostic(bool, PrintInlining, false, \ 2482 "Print inlining optimizations") \ 2483 \ 2484 product(bool, UsePopCountInstruction, false, \ 2485 "Use population count instruction") \ 2486 \ 2487 develop(bool, EagerInitialization, false, \ 2488 "Eagerly initialize classes if possible") \ 2489 \ 2490 diagnostic(bool, LogTouchedMethods, false, \ 2491 "Log methods which have been ever touched in runtime") \ 2492 \ 2493 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2494 "Print all methods that have been ever touched in runtime") \ 2495 \ 2496 develop(bool, TraceMethodReplacement, false, \ 2497 "Print when methods are replaced do to recompilation") \ 2498 \ 2499 develop(bool, PrintMethodFlushing, false, \ 2500 "Print the nmethods being flushed") \ 2501 \ 2502 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2503 "print statistics about method flushing") \ 2504 \ 2505 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2506 "Number of compiled code invocations after which " \ 2507 "the method is considered as hot by the flusher") \ 2508 range(1, max_jint) \ 2509 \ 2510 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2511 "Minimum number of sweeper passes before an nmethod " \ 2512 "can be flushed") \ 2513 range(0, max_intx) \ 2514 \ 2515 product(bool, UseCodeAging, true, \ 2516 "Insert counter to detect warm methods") \ 2517 \ 2518 diagnostic(bool, StressCodeAging, false, \ 2519 "Start with counters compiled in") \ 2520 \ 2521 develop(bool, StressCodeBuffers, false, \ 2522 "Exercise code buffer expansion and other rare state changes") \ 2523 \ 2524 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2525 "Generate extra debugging information for non-safepoints in " \ 2526 "nmethods") \ 2527 \ 2528 product(bool, PrintVMOptions, false, \ 2529 "Print flags that appeared on the command line") \ 2530 \ 2531 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2532 "Ignore unrecognized VM options") \ 2533 \ 2534 product(bool, PrintCommandLineFlags, false, \ 2535 "Print flags specified on command line or set by ergonomics") \ 2536 \ 2537 product(bool, PrintFlagsInitial, false, \ 2538 "Print all VM flags before argument processing and exit VM") \ 2539 \ 2540 product(bool, PrintFlagsFinal, false, \ 2541 "Print all VM flags after argument and ergonomic processing") \ 2542 \ 2543 notproduct(bool, PrintFlagsWithComments, false, \ 2544 "Print all VM flags with default values and descriptions and " \ 2545 "exit") \ 2546 \ 2547 product(bool, PrintFlagsRanges, false, \ 2548 "Print VM flags and their ranges and exit VM") \ 2549 \ 2550 diagnostic(bool, SerializeVMOutput, true, \ 2551 "Use a mutex to serialize output to tty and LogFile") \ 2552 \ 2553 diagnostic(bool, DisplayVMOutput, true, \ 2554 "Display all VM output on the tty, independently of LogVMOutput") \ 2555 \ 2556 diagnostic(bool, LogVMOutput, false, \ 2557 "Save VM output to LogFile") \ 2558 \ 2559 diagnostic(ccstr, LogFile, NULL, \ 2560 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2561 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2562 \ 2563 product(ccstr, ErrorFile, NULL, \ 2564 "If an error occurs, save the error data to this file " \ 2565 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2566 \ 2567 product(bool, DisplayVMOutputToStderr, false, \ 2568 "If DisplayVMOutput is true, display all VM output to stderr") \ 2569 \ 2570 product(bool, DisplayVMOutputToStdout, false, \ 2571 "If DisplayVMOutput is true, display all VM output to stdout") \ 2572 \ 2573 product(bool, UseHeavyMonitors, false, \ 2574 "use heavyweight instead of lightweight Java monitors") \ 2575 \ 2576 product(bool, PrintStringTableStatistics, false, \ 2577 "print statistics about the StringTable and SymbolTable") \ 2578 \ 2579 diagnostic(bool, VerifyStringTableAtExit, false, \ 2580 "verify StringTable contents at exit") \ 2581 \ 2582 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2583 "print histogram of the symbol table") \ 2584 \ 2585 notproduct(bool, ExitVMOnVerifyError, false, \ 2586 "standard exit from VM if bytecode verify error " \ 2587 "(only in debug mode)") \ 2588 \ 2589 diagnostic(ccstr, AbortVMOnException, NULL, \ 2590 "Call fatal if this exception is thrown. Example: " \ 2591 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2592 \ 2593 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2594 "Call fatal if the exception pointed by AbortVMOnException " \ 2595 "has this message") \ 2596 \ 2597 develop(bool, DebugVtables, false, \ 2598 "add debugging code to vtable dispatch") \ 2599 \ 2600 notproduct(bool, PrintVtableStats, false, \ 2601 "print vtables stats at end of run") \ 2602 \ 2603 develop(bool, TraceCreateZombies, false, \ 2604 "trace creation of zombie nmethods") \ 2605 \ 2606 notproduct(bool, IgnoreLockingAssertions, false, \ 2607 "disable locking assertions (for speed)") \ 2608 \ 2609 product(bool, RangeCheckElimination, true, \ 2610 "Eliminate range checks") \ 2611 \ 2612 develop_pd(bool, UncommonNullCast, \ 2613 "track occurrences of null in casts; adjust compiler tactics") \ 2614 \ 2615 develop(bool, TypeProfileCasts, true, \ 2616 "treat casts like calls for purposes of type profiling") \ 2617 \ 2618 develop(bool, DelayCompilationDuringStartup, true, \ 2619 "Delay invoking the compiler until main application class is " \ 2620 "loaded") \ 2621 \ 2622 develop(bool, CompileTheWorld, false, \ 2623 "Compile all methods in all classes in bootstrap class path " \ 2624 "(stress test)") \ 2625 \ 2626 develop(bool, CompileTheWorldPreloadClasses, true, \ 2627 "Preload all classes used by a class before start loading") \ 2628 \ 2629 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2630 "Force a safepoint every n compiles so sweeper can keep up") \ 2631 \ 2632 develop(bool, FillDelaySlots, true, \ 2633 "Fill delay slots (on SPARC only)") \ 2634 \ 2635 develop(bool, TimeLivenessAnalysis, false, \ 2636 "Time computation of bytecode liveness analysis") \ 2637 \ 2638 develop(bool, TraceLivenessGen, false, \ 2639 "Trace the generation of liveness analysis information") \ 2640 \ 2641 notproduct(bool, TraceLivenessQuery, false, \ 2642 "Trace queries of liveness analysis information") \ 2643 \ 2644 notproduct(bool, CollectIndexSetStatistics, false, \ 2645 "Collect information about IndexSets") \ 2646 \ 2647 develop(bool, UseLoopSafepoints, true, \ 2648 "Generate Safepoint nodes in every loop") \ 2649 \ 2650 develop(intx, FastAllocateSizeLimit, 128*K, \ 2651 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2652 "Inline allocations larger than this in doublewords must go slow")\ 2653 \ 2654 product(bool, AggressiveOpts, false, \ 2655 "Enable aggressive optimizations - see arguments.cpp") \ 2656 \ 2657 product_pd(bool, CompactStrings, \ 2658 "Enable Strings to use single byte chars in backing store") \ 2659 \ 2660 product_pd(uintx, TypeProfileLevel, \ 2661 "=XYZ, with Z: Type profiling of arguments at call; " \ 2662 "Y: Type profiling of return value at call; " \ 2663 "X: Type profiling of parameters to methods; " \ 2664 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2665 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2666 \ 2667 product(intx, TypeProfileArgsLimit, 2, \ 2668 "max number of call arguments to consider for type profiling") \ 2669 range(0, 16) \ 2670 \ 2671 product(intx, TypeProfileParmsLimit, 2, \ 2672 "max number of incoming parameters to consider for type profiling"\ 2673 ", -1 for all") \ 2674 range(-1, 64) \ 2675 \ 2676 /* statistics */ \ 2677 develop(bool, CountCompiledCalls, false, \ 2678 "Count method invocations") \ 2679 \ 2680 notproduct(bool, CountRuntimeCalls, false, \ 2681 "Count VM runtime calls") \ 2682 \ 2683 develop(bool, CountJNICalls, false, \ 2684 "Count jni method invocations") \ 2685 \ 2686 notproduct(bool, CountJVMCalls, false, \ 2687 "Count jvm method invocations") \ 2688 \ 2689 notproduct(bool, CountRemovableExceptions, false, \ 2690 "Count exceptions that could be replaced by branches due to " \ 2691 "inlining") \ 2692 \ 2693 notproduct(bool, ICMissHistogram, false, \ 2694 "Produce histogram of IC misses") \ 2695 \ 2696 /* interpreter */ \ 2697 product_pd(bool, RewriteBytecodes, \ 2698 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2699 \ 2700 product_pd(bool, RewriteFrequentPairs, \ 2701 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2702 \ 2703 diagnostic(bool, PrintInterpreter, false, \ 2704 "Print the generated interpreter code") \ 2705 \ 2706 product(bool, UseInterpreter, true, \ 2707 "Use interpreter for non-compiled methods") \ 2708 \ 2709 develop(bool, UseFastSignatureHandlers, true, \ 2710 "Use fast signature handlers for native calls") \ 2711 \ 2712 product(bool, UseLoopCounter, true, \ 2713 "Increment invocation counter on backward branch") \ 2714 \ 2715 product_pd(bool, UseOnStackReplacement, \ 2716 "Use on stack replacement, calls runtime if invoc. counter " \ 2717 "overflows in loop") \ 2718 \ 2719 notproduct(bool, TraceOnStackReplacement, false, \ 2720 "Trace on stack replacement") \ 2721 \ 2722 product_pd(bool, PreferInterpreterNativeStubs, \ 2723 "Use always interpreter stubs for native methods invoked via " \ 2724 "interpreter") \ 2725 \ 2726 develop(bool, CountBytecodes, false, \ 2727 "Count number of bytecodes executed") \ 2728 \ 2729 develop(bool, PrintBytecodeHistogram, false, \ 2730 "Print histogram of the executed bytecodes") \ 2731 \ 2732 develop(bool, PrintBytecodePairHistogram, false, \ 2733 "Print histogram of the executed bytecode pairs") \ 2734 \ 2735 diagnostic(bool, PrintSignatureHandlers, false, \ 2736 "Print code generated for native method signature handlers") \ 2737 \ 2738 develop(bool, VerifyOops, false, \ 2739 "Do plausibility checks for oops") \ 2740 \ 2741 develop(bool, CheckUnhandledOops, false, \ 2742 "Check for unhandled oops in VM code") \ 2743 \ 2744 develop(bool, VerifyJNIFields, trueInDebug, \ 2745 "Verify jfieldIDs for instance fields") \ 2746 \ 2747 notproduct(bool, VerifyJNIEnvThread, false, \ 2748 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2749 "from JNI") \ 2750 \ 2751 develop(bool, VerifyFPU, false, \ 2752 "Verify FPU state (check for NaN's, etc.)") \ 2753 \ 2754 develop(bool, VerifyThread, false, \ 2755 "Watch the thread register for corruption (SPARC only)") \ 2756 \ 2757 develop(bool, VerifyActivationFrameSize, false, \ 2758 "Verify that activation frame didn't become smaller than its " \ 2759 "minimal size") \ 2760 \ 2761 develop(bool, TraceFrequencyInlining, false, \ 2762 "Trace frequency based inlining") \ 2763 \ 2764 develop_pd(bool, InlineIntrinsics, \ 2765 "Inline intrinsics that can be statically resolved") \ 2766 \ 2767 product_pd(bool, ProfileInterpreter, \ 2768 "Profile at the bytecode level during interpretation") \ 2769 \ 2770 develop(bool, TraceProfileInterpreter, false, \ 2771 "Trace profiling at the bytecode level during interpretation. " \ 2772 "This outputs the profiling information collected to improve " \ 2773 "jit compilation.") \ 2774 \ 2775 develop_pd(bool, ProfileTraps, \ 2776 "Profile deoptimization traps at the bytecode level") \ 2777 \ 2778 product(intx, ProfileMaturityPercentage, 20, \ 2779 "number of method invocations/branches (expressed as % of " \ 2780 "CompileThreshold) before using the method's profile") \ 2781 range(0, 100) \ 2782 \ 2783 diagnostic(bool, PrintMethodData, false, \ 2784 "Print the results of +ProfileInterpreter at end of run") \ 2785 \ 2786 develop(bool, VerifyDataPointer, trueInDebug, \ 2787 "Verify the method data pointer during interpreter profiling") \ 2788 \ 2789 develop(bool, VerifyCompiledCode, false, \ 2790 "Include miscellaneous runtime verifications in nmethod code; " \ 2791 "default off because it disturbs nmethod size heuristics") \ 2792 \ 2793 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2794 "Manually make GC thread crash then dump java stack trace; " \ 2795 "Test only") \ 2796 \ 2797 /* compilation */ \ 2798 product(bool, UseCompiler, true, \ 2799 "Use Just-In-Time compilation") \ 2800 \ 2801 develop(bool, TraceCompilationPolicy, false, \ 2802 "Trace compilation policy") \ 2803 \ 2804 develop(bool, TimeCompilationPolicy, false, \ 2805 "Time the compilation policy") \ 2806 \ 2807 product(bool, UseCounterDecay, true, \ 2808 "Adjust recompilation counters") \ 2809 \ 2810 develop(intx, CounterHalfLifeTime, 30, \ 2811 "Half-life time of invocation counters (in seconds)") \ 2812 \ 2813 develop(intx, CounterDecayMinIntervalLength, 500, \ 2814 "The minimum interval (in milliseconds) between invocation of " \ 2815 "CounterDecay") \ 2816 \ 2817 product(bool, AlwaysCompileLoopMethods, false, \ 2818 "When using recompilation, never interpret methods " \ 2819 "containing loops") \ 2820 \ 2821 product(bool, DontCompileHugeMethods, true, \ 2822 "Do not compile methods > HugeMethodLimit") \ 2823 \ 2824 /* Bytecode escape analysis estimation. */ \ 2825 product(bool, EstimateArgEscape, true, \ 2826 "Analyze bytecodes to estimate escape state of arguments") \ 2827 \ 2828 product(intx, BCEATraceLevel, 0, \ 2829 "How much tracing to do of bytecode escape analysis estimates " \ 2830 "(0-3)") \ 2831 range(0, 3) \ 2832 \ 2833 product(intx, MaxBCEAEstimateLevel, 5, \ 2834 "Maximum number of nested calls that are analyzed by BC EA") \ 2835 range(0, max_jint) \ 2836 \ 2837 product(intx, MaxBCEAEstimateSize, 150, \ 2838 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2839 range(0, max_jint) \ 2840 \ 2841 product(intx, AllocatePrefetchStyle, 1, \ 2842 "0 = no prefetch, " \ 2843 "1 = generate prefetch instructions for each allocation, " \ 2844 "2 = use TLAB watermark to gate allocation prefetch, " \ 2845 "3 = generate one prefetch instruction per cache line") \ 2846 range(0, 3) \ 2847 \ 2848 product(intx, AllocatePrefetchDistance, -1, \ 2849 "Distance to prefetch ahead of allocation pointer. " \ 2850 "-1: use system-specific value (automatically determined") \ 2851 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2852 \ 2853 product(intx, AllocatePrefetchLines, 3, \ 2854 "Number of lines to prefetch ahead of array allocation pointer") \ 2855 range(1, 64) \ 2856 \ 2857 product(intx, AllocateInstancePrefetchLines, 1, \ 2858 "Number of lines to prefetch ahead of instance allocation " \ 2859 "pointer") \ 2860 range(1, 64) \ 2861 \ 2862 product(intx, AllocatePrefetchStepSize, 16, \ 2863 "Step size in bytes of sequential prefetch instructions") \ 2864 range(1, 512) \ 2865 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2866 \ 2867 product(intx, AllocatePrefetchInstr, 0, \ 2868 "Select instruction to prefetch ahead of allocation pointer") \ 2869 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2870 \ 2871 /* deoptimization */ \ 2872 develop(bool, TraceDeoptimization, false, \ 2873 "Trace deoptimization") \ 2874 \ 2875 develop(bool, PrintDeoptimizationDetails, false, \ 2876 "Print more information about deoptimization") \ 2877 \ 2878 develop(bool, DebugDeoptimization, false, \ 2879 "Tracing various information while debugging deoptimization") \ 2880 \ 2881 product(intx, SelfDestructTimer, 0, \ 2882 "Will cause VM to terminate after a given time (in minutes) " \ 2883 "(0 means off)") \ 2884 range(0, max_intx) \ 2885 \ 2886 product(intx, MaxJavaStackTraceDepth, 1024, \ 2887 "The maximum number of lines in the stack trace for Java " \ 2888 "exceptions (0 means all)") \ 2889 range(0, max_jint/2) \ 2890 \ 2891 /* notice: the max range value here is max_jint, not max_intx */ \ 2892 /* because of overflow issue */ \ 2893 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2894 "Guarantee a safepoint (at least) every so many milliseconds " \ 2895 "(0 means none)") \ 2896 range(0, max_jint) \ 2897 \ 2898 product(intx, SafepointTimeoutDelay, 10000, \ 2899 "Delay in milliseconds for option SafepointTimeout") \ 2900 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2901 NOT_LP64(range(0, max_intx)) \ 2902 \ 2903 product(intx, NmethodSweepActivity, 10, \ 2904 "Removes cold nmethods from code cache if > 0. Higher values " \ 2905 "result in more aggressive sweeping") \ 2906 range(0, 2000) \ 2907 \ 2908 notproduct(bool, LogSweeper, false, \ 2909 "Keep a ring buffer of sweeper activity") \ 2910 \ 2911 notproduct(intx, SweeperLogEntries, 1024, \ 2912 "Number of records in the ring buffer of sweeper activity") \ 2913 \ 2914 notproduct(intx, MemProfilingInterval, 500, \ 2915 "Time between each invocation of the MemProfiler") \ 2916 \ 2917 develop(intx, MallocCatchPtr, -1, \ 2918 "Hit breakpoint when mallocing/freeing this pointer") \ 2919 \ 2920 notproduct(ccstrlist, SuppressErrorAt, "", \ 2921 "List of assertions (file:line) to muzzle") \ 2922 \ 2923 develop(intx, StackPrintLimit, 100, \ 2924 "number of stack frames to print in VM-level stack dump") \ 2925 \ 2926 notproduct(intx, MaxElementPrintSize, 256, \ 2927 "maximum number of elements to print") \ 2928 \ 2929 notproduct(intx, MaxSubklassPrintSize, 4, \ 2930 "maximum number of subklasses to print when printing klass") \ 2931 \ 2932 product(intx, MaxInlineLevel, 9, \ 2933 "maximum number of nested calls that are inlined") \ 2934 range(0, max_jint) \ 2935 \ 2936 product(intx, MaxRecursiveInlineLevel, 1, \ 2937 "maximum number of nested recursive calls that are inlined") \ 2938 range(0, max_jint) \ 2939 \ 2940 develop(intx, MaxForceInlineLevel, 100, \ 2941 "maximum number of nested calls that are forced for inlining " \ 2942 "(using CompileCommand or marked w/ @ForceInline)") \ 2943 range(0, max_jint) \ 2944 \ 2945 product_pd(intx, InlineSmallCode, \ 2946 "Only inline already compiled methods if their code size is " \ 2947 "less than this") \ 2948 range(0, max_jint) \ 2949 \ 2950 product(intx, MaxInlineSize, 35, \ 2951 "The maximum bytecode size of a method to be inlined") \ 2952 range(0, max_jint) \ 2953 \ 2954 product_pd(intx, FreqInlineSize, \ 2955 "The maximum bytecode size of a frequent method to be inlined") \ 2956 range(0, max_jint) \ 2957 \ 2958 product(intx, MaxTrivialSize, 6, \ 2959 "The maximum bytecode size of a trivial method to be inlined") \ 2960 range(0, max_jint) \ 2961 \ 2962 product(intx, MinInliningThreshold, 250, \ 2963 "The minimum invocation count a method needs to have to be " \ 2964 "inlined") \ 2965 range(0, max_jint) \ 2966 \ 2967 develop(intx, MethodHistogramCutoff, 100, \ 2968 "The cutoff value for method invocation histogram (+CountCalls)") \ 2969 \ 2970 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2971 "Number of interpreted methods to show in profile") \ 2972 \ 2973 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2974 "Number of compiled methods to show in profile") \ 2975 \ 2976 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2977 "Number of stub methods to show in profile") \ 2978 \ 2979 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2980 "Number of runtime stub nodes to show in profile") \ 2981 \ 2982 product(intx, ProfileIntervalsTicks, 100, \ 2983 "Number of ticks between printing of interval profile " \ 2984 "(+ProfileIntervals)") \ 2985 range(0, max_intx) \ 2986 \ 2987 notproduct(intx, ScavengeALotInterval, 1, \ 2988 "Interval between which scavenge will occur with +ScavengeALot") \ 2989 \ 2990 notproduct(intx, FullGCALotInterval, 1, \ 2991 "Interval between which full gc will occur with +FullGCALot") \ 2992 \ 2993 notproduct(intx, FullGCALotStart, 0, \ 2994 "For which invocation to start FullGCAlot") \ 2995 \ 2996 notproduct(intx, FullGCALotDummies, 32*K, \ 2997 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2998 "to move") \ 2999 \ 3000 develop(intx, DontYieldALotInterval, 10, \ 3001 "Interval between which yields will be dropped (milliseconds)") \ 3002 \ 3003 develop(intx, ProfilerPCTickThreshold, 15, \ 3004 "Number of ticks in a PC buckets to be a hotspot") \ 3005 \ 3006 notproduct(intx, DeoptimizeALotInterval, 5, \ 3007 "Number of exits until DeoptimizeALot kicks in") \ 3008 \ 3009 notproduct(intx, ZombieALotInterval, 5, \ 3010 "Number of exits until ZombieALot kicks in") \ 3011 \ 3012 diagnostic(uintx, MallocMaxTestWords, 0, \ 3013 "If non-zero, maximum number of words that malloc/realloc can " \ 3014 "allocate (for testing only)") \ 3015 range(0, max_uintx) \ 3016 \ 3017 product(intx, TypeProfileWidth, 2, \ 3018 "Number of receiver types to record in call/cast profile") \ 3019 range(0, 8) \ 3020 \ 3021 develop(intx, BciProfileWidth, 2, \ 3022 "Number of return bci's to record in ret profile") \ 3023 \ 3024 product(intx, PerMethodRecompilationCutoff, 400, \ 3025 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3026 range(-1, max_intx) \ 3027 \ 3028 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3029 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3030 range(-1, max_intx) \ 3031 \ 3032 product(intx, PerMethodTrapLimit, 100, \ 3033 "Limit on traps (of one kind) in a method (includes inlines)") \ 3034 range(0, max_jint) \ 3035 \ 3036 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3037 "Limit on speculative traps (of one kind) in a method " \ 3038 "(includes inlines)") \ 3039 range(0, max_jint) \ 3040 \ 3041 product(intx, PerBytecodeTrapLimit, 4, \ 3042 "Limit on traps (of one kind) at a particular BCI") \ 3043 range(0, max_jint) \ 3044 \ 3045 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3046 "Extra method data trap entries for speculation") \ 3047 \ 3048 develop(intx, InlineFrequencyRatio, 20, \ 3049 "Ratio of call site execution to caller method invocation") \ 3050 range(0, max_jint) \ 3051 \ 3052 diagnostic_pd(intx, InlineFrequencyCount, \ 3053 "Count of call site execution necessary to trigger frequent " \ 3054 "inlining") \ 3055 range(0, max_jint) \ 3056 \ 3057 develop(intx, InlineThrowCount, 50, \ 3058 "Force inlining of interpreted methods that throw this often") \ 3059 range(0, max_jint) \ 3060 \ 3061 develop(intx, InlineThrowMaxSize, 200, \ 3062 "Force inlining of throwing methods smaller than this") \ 3063 range(0, max_jint) \ 3064 \ 3065 develop(intx, ProfilerNodeSize, 1024, \ 3066 "Size in K to allocate for the Profile Nodes of each thread") \ 3067 range(0, 1024) \ 3068 \ 3069 /* gc parameters */ \ 3070 product(size_t, InitialHeapSize, 0, \ 3071 "Initial heap size (in bytes); zero means use ergonomics") \ 3072 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3073 \ 3074 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3075 "Maximum heap size (in bytes)") \ 3076 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3077 \ 3078 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3079 "Initial tenured generation size (in bytes)") \ 3080 range(0, max_uintx) \ 3081 \ 3082 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3083 "Initial new generation size (in bytes)") \ 3084 constraint(NewSizeConstraintFunc,AfterErgo) \ 3085 \ 3086 product(size_t, MaxNewSize, max_uintx, \ 3087 "Maximum new generation size (in bytes), max_uintx means set " \ 3088 "ergonomically") \ 3089 range(0, max_uintx) \ 3090 \ 3091 product_pd(size_t, HeapBaseMinAddress, \ 3092 "OS specific low limit for heap base address") \ 3093 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3094 \ 3095 product(size_t, PretenureSizeThreshold, 0, \ 3096 "Maximum size in bytes of objects allocated in DefNew " \ 3097 "generation; zero means no maximum") \ 3098 range(0, max_uintx) \ 3099 \ 3100 product(size_t, MinTLABSize, 2*K, \ 3101 "Minimum allowed TLAB size (in bytes)") \ 3102 range(1, max_uintx/2) \ 3103 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3104 \ 3105 product(size_t, TLABSize, 0, \ 3106 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3107 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3108 \ 3109 product(size_t, YoungPLABSize, 4096, \ 3110 "Size of young gen promotion LAB's (in HeapWords)") \ 3111 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3112 \ 3113 product(size_t, OldPLABSize, 1024, \ 3114 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3115 "of blocks to attempt to claim when refilling CMS LAB's") \ 3116 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3117 \ 3118 product(uintx, TLABAllocationWeight, 35, \ 3119 "Allocation averaging weight") \ 3120 range(0, 100) \ 3121 \ 3122 /* Limit the lower bound of this flag to 1 as it is used */ \ 3123 /* in a division expression. */ \ 3124 product(uintx, TLABWasteTargetPercent, 1, \ 3125 "Percentage of Eden that can be wasted") \ 3126 range(1, 100) \ 3127 \ 3128 product(uintx, TLABRefillWasteFraction, 64, \ 3129 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3130 range(1, max_juint) \ 3131 \ 3132 product(uintx, TLABWasteIncrement, 4, \ 3133 "Increment allowed waste at slow allocation") \ 3134 range(0, max_jint) \ 3135 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3136 \ 3137 product(uintx, SurvivorRatio, 8, \ 3138 "Ratio of eden/survivor space size") \ 3139 range(1, max_uintx-2) \ 3140 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3141 \ 3142 product(uintx, NewRatio, 2, \ 3143 "Ratio of old/new generation sizes") \ 3144 range(0, max_uintx-1) \ 3145 \ 3146 product_pd(size_t, NewSizeThreadIncrease, \ 3147 "Additional size added to desired new generation size per " \ 3148 "non-daemon thread (in bytes)") \ 3149 range(0, max_uintx) \ 3150 \ 3151 product_pd(size_t, MetaspaceSize, \ 3152 "Initial threshold (in bytes) at which a garbage collection " \ 3153 "is done to reduce Metaspace usage") \ 3154 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3155 \ 3156 product(size_t, MaxMetaspaceSize, max_uintx, \ 3157 "Maximum size of Metaspaces (in bytes)") \ 3158 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3159 \ 3160 product(size_t, CompressedClassSpaceSize, 1*G, \ 3161 "Maximum size of class area in Metaspace when compressed " \ 3162 "class pointers are used") \ 3163 range(1*M, 3*G) \ 3164 \ 3165 manageable(uintx, MinHeapFreeRatio, 40, \ 3166 "The minimum percentage of heap free after GC to avoid expansion."\ 3167 " For most GCs this applies to the old generation. In G1 and" \ 3168 " ParallelGC it applies to the whole heap.") \ 3169 range(0, 100) \ 3170 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3171 \ 3172 manageable(uintx, MaxHeapFreeRatio, 70, \ 3173 "The maximum percentage of heap free after GC to avoid shrinking."\ 3174 " For most GCs this applies to the old generation. In G1 and" \ 3175 " ParallelGC it applies to the whole heap.") \ 3176 range(0, 100) \ 3177 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3178 \ 3179 product(bool, ShrinkHeapInSteps, true, \ 3180 "When disabled, informs the GC to shrink the java heap directly" \ 3181 " to the target size at the next full GC rather than requiring" \ 3182 " smaller steps during multiple full GCs.") \ 3183 \ 3184 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3185 "Number of milliseconds per MB of free space in the heap") \ 3186 range(0, max_intx) \ 3187 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3188 \ 3189 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3190 "The minimum change in heap space due to GC (in bytes)") \ 3191 range(0, max_uintx) \ 3192 \ 3193 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3194 "The minimum expansion of Metaspace (in bytes)") \ 3195 range(0, max_uintx) \ 3196 \ 3197 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3198 "The maximum percentage of Metaspace free after GC to avoid " \ 3199 "shrinking") \ 3200 range(0, 100) \ 3201 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3202 \ 3203 product(uintx, MinMetaspaceFreeRatio, 40, \ 3204 "The minimum percentage of Metaspace free after GC to avoid " \ 3205 "expansion") \ 3206 range(0, 99) \ 3207 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3208 \ 3209 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3210 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3211 range(0, max_uintx) \ 3212 \ 3213 product(uintx, QueuedAllocationWarningCount, 0, \ 3214 "Number of times an allocation that queues behind a GC " \ 3215 "will retry before printing a warning") \ 3216 range(0, max_uintx) \ 3217 \ 3218 diagnostic(uintx, VerifyGCStartAt, 0, \ 3219 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3220 range(0, max_uintx) \ 3221 \ 3222 diagnostic(intx, VerifyGCLevel, 0, \ 3223 "Generation level at which to start +VerifyBefore/AfterGC") \ 3224 range(0, 1) \ 3225 \ 3226 product(uintx, MaxTenuringThreshold, 15, \ 3227 "Maximum value for tenuring threshold") \ 3228 range(0, markOopDesc::max_age + 1) \ 3229 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3230 \ 3231 product(uintx, InitialTenuringThreshold, 7, \ 3232 "Initial value for tenuring threshold") \ 3233 range(0, markOopDesc::max_age + 1) \ 3234 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3235 \ 3236 product(uintx, TargetSurvivorRatio, 50, \ 3237 "Desired percentage of survivor space used after scavenge") \ 3238 range(0, 100) \ 3239 \ 3240 product(uintx, MarkSweepDeadRatio, 5, \ 3241 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3242 "Serial mark sweep treats this as both the minimum and maximum " \ 3243 "value. " \ 3244 "CMS uses this value only if it falls back to mark sweep. " \ 3245 "Par compact uses a variable scale based on the density of the " \ 3246 "generation and treats this as the maximum value when the heap " \ 3247 "is either completely full or completely empty. Par compact " \ 3248 "also has a smaller default value; see arguments.cpp.") \ 3249 range(0, 100) \ 3250 \ 3251 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3252 "How often should we fully compact the heap (ignoring the dead " \ 3253 "space parameters)") \ 3254 range(1, max_juint) \ 3255 \ 3256 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3257 "Delay between expansion and allocation (in milliseconds)") \ 3258 \ 3259 develop(uintx, GCWorkerDelayMillis, 0, \ 3260 "Delay in scheduling GC workers (in milliseconds)") \ 3261 \ 3262 product(bool, PSChunkLargeArrays, true, \ 3263 "Process large arrays in chunks") \ 3264 \ 3265 product(uintx, GCDrainStackTargetSize, 64, \ 3266 "Number of entries we will try to leave on the stack " \ 3267 "during parallel gc") \ 3268 range(0, max_juint) \ 3269 \ 3270 /* stack parameters */ \ 3271 product_pd(intx, StackYellowPages, \ 3272 "Number of yellow zone (recoverable overflows) pages of size " \ 3273 "4KB. If pages are bigger yellow zone is aligned up.") \ 3274 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3275 \ 3276 product_pd(intx, StackRedPages, \ 3277 "Number of red zone (unrecoverable overflows) pages of size " \ 3278 "4KB. If pages are bigger red zone is aligned up.") \ 3279 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3280 \ 3281 product_pd(intx, StackReservedPages, \ 3282 "Number of reserved zone (reserved to annotated methods) pages" \ 3283 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3284 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3285 \ 3286 product(bool, RestrictReservedStack, true, \ 3287 "Restrict @ReservedStackAccess to trusted classes") \ 3288 \ 3289 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3290 product_pd(intx, StackShadowPages, \ 3291 "Number of shadow zone (for overflow checking) pages of size " \ 3292 "4KB. If pages are bigger shadow zone is aligned up. " \ 3293 "This should exceed the depth of the VM and native call stack.") \ 3294 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3295 \ 3296 product_pd(intx, ThreadStackSize, \ 3297 "Thread Stack Size (in Kbytes)") \ 3298 range(0, 1 * M) \ 3299 \ 3300 product_pd(intx, VMThreadStackSize, \ 3301 "Non-Java Thread Stack Size (in Kbytes)") \ 3302 range(0, max_intx/(1 * K)) \ 3303 \ 3304 product_pd(intx, CompilerThreadStackSize, \ 3305 "Compiler Thread Stack Size (in Kbytes)") \ 3306 range(0, max_intx/(1 * K)) \ 3307 \ 3308 develop_pd(size_t, JVMInvokeMethodSlack, \ 3309 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3310 \ 3311 /* code cache parameters */ \ 3312 develop_pd(uintx, CodeCacheSegmentSize, \ 3313 "Code cache segment size (in bytes) - smallest unit of " \ 3314 "allocation") \ 3315 range(1, 1024) \ 3316 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3317 \ 3318 develop_pd(intx, CodeEntryAlignment, \ 3319 "Code entry alignment for generated code (in bytes)") \ 3320 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3321 \ 3322 product_pd(intx, OptoLoopAlignment, \ 3323 "Align inner loops to zero relative to this modulus") \ 3324 range(1, 16) \ 3325 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3326 \ 3327 product_pd(uintx, InitialCodeCacheSize, \ 3328 "Initial code cache size (in bytes)") \ 3329 range(os::vm_page_size(), max_uintx) \ 3330 \ 3331 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3332 "Minimum code cache size (in bytes) required to start VM.") \ 3333 range(0, max_uintx) \ 3334 \ 3335 product(bool, SegmentedCodeCache, false, \ 3336 "Use a segmented code cache") \ 3337 \ 3338 product_pd(uintx, ReservedCodeCacheSize, \ 3339 "Reserved code cache size (in bytes) - maximum code cache size") \ 3340 range(os::vm_page_size(), max_uintx) \ 3341 \ 3342 product_pd(uintx, NonProfiledCodeHeapSize, \ 3343 "Size of code heap with non-profiled methods (in bytes)") \ 3344 range(0, max_uintx) \ 3345 \ 3346 product_pd(uintx, ProfiledCodeHeapSize, \ 3347 "Size of code heap with profiled methods (in bytes)") \ 3348 range(0, max_uintx) \ 3349 \ 3350 product_pd(uintx, NonNMethodCodeHeapSize, \ 3351 "Size of code heap with non-nmethods (in bytes)") \ 3352 range(os::vm_page_size(), max_uintx) \ 3353 \ 3354 product_pd(uintx, CodeCacheExpansionSize, \ 3355 "Code cache expansion size (in bytes)") \ 3356 range(32*K, max_uintx) \ 3357 \ 3358 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 3359 "Minimum number of segments in a code cache block") \ 3360 range(1, 100) \ 3361 \ 3362 notproduct(bool, ExitOnFullCodeCache, false, \ 3363 "Exit the VM if we fill the code cache") \ 3364 \ 3365 product(bool, UseCodeCacheFlushing, true, \ 3366 "Remove cold/old nmethods from the code cache") \ 3367 \ 3368 product(uintx, StartAggressiveSweepingAt, 10, \ 3369 "Start aggressive sweeping if X[%] of the code cache is free." \ 3370 "Segmented code cache: X[%] of the non-profiled heap." \ 3371 "Non-segmented code cache: X[%] of the total code cache") \ 3372 range(0, 100) \ 3373 \ 3374 /* AOT parameters */ \ 3375 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3376 "Use AOT compiled files") \ 3377 \ 3378 product(ccstrlist, AOTLibrary, NULL, \ 3379 "AOT library") \ 3380 \ 3381 product(bool, PrintAOT, false, \ 3382 "Print used AOT klasses and methods") \ 3383 \ 3384 notproduct(bool, PrintAOTStatistics, false, \ 3385 "Print AOT statistics") \ 3386 \ 3387 diagnostic(bool, UseAOTStrictLoading, false, \ 3388 "Exit the VM if any of the AOT libraries has invalid config") \ 3389 \ 3390 product(bool, CalculateClassFingerprint, false, \ 3391 "Calculate class fingerprint") \ 3392 \ 3393 /* interpreter debugging */ \ 3394 develop(intx, BinarySwitchThreshold, 5, \ 3395 "Minimal number of lookupswitch entries for rewriting to binary " \ 3396 "switch") \ 3397 \ 3398 develop(intx, StopInterpreterAt, 0, \ 3399 "Stop interpreter execution at specified bytecode number") \ 3400 \ 3401 develop(intx, TraceBytecodesAt, 0, \ 3402 "Trace bytecodes starting with specified bytecode number") \ 3403 \ 3404 /* compiler interface */ \ 3405 develop(intx, CIStart, 0, \ 3406 "The id of the first compilation to permit") \ 3407 \ 3408 develop(intx, CIStop, max_jint, \ 3409 "The id of the last compilation to permit") \ 3410 \ 3411 develop(intx, CIStartOSR, 0, \ 3412 "The id of the first osr compilation to permit " \ 3413 "(CICountOSR must be on)") \ 3414 \ 3415 develop(intx, CIStopOSR, max_jint, \ 3416 "The id of the last osr compilation to permit " \ 3417 "(CICountOSR must be on)") \ 3418 \ 3419 develop(intx, CIBreakAtOSR, -1, \ 3420 "The id of osr compilation to break at") \ 3421 \ 3422 develop(intx, CIBreakAt, -1, \ 3423 "The id of compilation to break at") \ 3424 \ 3425 product(ccstrlist, CompileOnly, "", \ 3426 "List of methods (pkg/class.name) to restrict compilation to") \ 3427 \ 3428 product(ccstr, CompileCommandFile, NULL, \ 3429 "Read compiler commands from this file [.hotspot_compiler]") \ 3430 \ 3431 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3432 "Read compiler directives from this file") \ 3433 \ 3434 product(ccstrlist, CompileCommand, "", \ 3435 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3436 \ 3437 develop(bool, ReplayCompiles, false, \ 3438 "Enable replay of compilations from ReplayDataFile") \ 3439 \ 3440 product(ccstr, ReplayDataFile, NULL, \ 3441 "File containing compilation replay information" \ 3442 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3443 \ 3444 product(ccstr, InlineDataFile, NULL, \ 3445 "File containing inlining replay information" \ 3446 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3447 \ 3448 develop(intx, ReplaySuppressInitializers, 2, \ 3449 "Control handling of class initialization during replay: " \ 3450 "0 - don't do anything special; " \ 3451 "1 - treat all class initializers as empty; " \ 3452 "2 - treat class initializers for application classes as empty; " \ 3453 "3 - allow all class initializers to run during bootstrap but " \ 3454 " pretend they are empty after starting replay") \ 3455 range(0, 3) \ 3456 \ 3457 develop(bool, ReplayIgnoreInitErrors, false, \ 3458 "Ignore exceptions thrown during initialization for replay") \ 3459 \ 3460 product(bool, DumpReplayDataOnError, true, \ 3461 "Record replay data for crashing compiler threads") \ 3462 \ 3463 product(bool, CICompilerCountPerCPU, false, \ 3464 "1 compiler thread for log(N CPUs)") \ 3465 \ 3466 develop(intx, CIFireOOMAt, -1, \ 3467 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3468 "(non-negative value throws OOM after this many CI accesses " \ 3469 "in each compile)") \ 3470 notproduct(intx, CICrashAt, -1, \ 3471 "id of compilation to trigger assert in compiler thread for " \ 3472 "the purpose of testing, e.g. generation of replay data") \ 3473 notproduct(bool, CIObjectFactoryVerify, false, \ 3474 "enable potentially expensive verification in ciObjectFactory") \ 3475 \ 3476 /* Priorities */ \ 3477 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3478 \ 3479 product(intx, ThreadPriorityPolicy, 0, \ 3480 "0 : Normal. "\ 3481 " VM chooses priorities that are appropriate for normal "\ 3482 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3483 " to normal native priority. Java priorities below " \ 3484 " NORM_PRIORITY map to lower native priority values. On "\ 3485 " Windows applications are allowed to use higher native "\ 3486 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3487 " not use the highest possible native priority, "\ 3488 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3489 " system threads. On Linux thread priorities are ignored "\ 3490 " because the OS does not support static priority in "\ 3491 " SCHED_OTHER scheduling class which is the only choice for "\ 3492 " non-root, non-realtime applications. "\ 3493 "1 : Aggressive. "\ 3494 " Java thread priorities map over to the entire range of "\ 3495 " native thread priorities. Higher Java thread priorities map "\ 3496 " to higher native thread priorities. This policy should be "\ 3497 " used with care, as sometimes it can cause performance "\ 3498 " degradation in the application and/or the entire system. On "\ 3499 " Linux this policy requires root privilege.") \ 3500 range(0, 1) \ 3501 \ 3502 product(bool, ThreadPriorityVerbose, false, \ 3503 "Print priority changes") \ 3504 \ 3505 product(intx, CompilerThreadPriority, -1, \ 3506 "The native priority at which compiler threads should run " \ 3507 "(-1 means no change)") \ 3508 range(min_jint, max_jint) \ 3509 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3510 \ 3511 product(intx, VMThreadPriority, -1, \ 3512 "The native priority at which the VM thread should run " \ 3513 "(-1 means no change)") \ 3514 range(-1, 127) \ 3515 \ 3516 product(bool, CompilerThreadHintNoPreempt, false, \ 3517 "(Solaris only) Give compiler threads an extra quanta") \ 3518 \ 3519 product(bool, VMThreadHintNoPreempt, false, \ 3520 "(Solaris only) Give VM thread an extra quanta") \ 3521 \ 3522 product(intx, JavaPriority1_To_OSPriority, -1, \ 3523 "Map Java priorities to OS priorities") \ 3524 range(-1, 127) \ 3525 \ 3526 product(intx, JavaPriority2_To_OSPriority, -1, \ 3527 "Map Java priorities to OS priorities") \ 3528 range(-1, 127) \ 3529 \ 3530 product(intx, JavaPriority3_To_OSPriority, -1, \ 3531 "Map Java priorities to OS priorities") \ 3532 range(-1, 127) \ 3533 \ 3534 product(intx, JavaPriority4_To_OSPriority, -1, \ 3535 "Map Java priorities to OS priorities") \ 3536 range(-1, 127) \ 3537 \ 3538 product(intx, JavaPriority5_To_OSPriority, -1, \ 3539 "Map Java priorities to OS priorities") \ 3540 range(-1, 127) \ 3541 \ 3542 product(intx, JavaPriority6_To_OSPriority, -1, \ 3543 "Map Java priorities to OS priorities") \ 3544 range(-1, 127) \ 3545 \ 3546 product(intx, JavaPriority7_To_OSPriority, -1, \ 3547 "Map Java priorities to OS priorities") \ 3548 range(-1, 127) \ 3549 \ 3550 product(intx, JavaPriority8_To_OSPriority, -1, \ 3551 "Map Java priorities to OS priorities") \ 3552 range(-1, 127) \ 3553 \ 3554 product(intx, JavaPriority9_To_OSPriority, -1, \ 3555 "Map Java priorities to OS priorities") \ 3556 range(-1, 127) \ 3557 \ 3558 product(intx, JavaPriority10_To_OSPriority,-1, \ 3559 "Map Java priorities to OS priorities") \ 3560 range(-1, 127) \ 3561 \ 3562 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3563 "Java thread priority 10 maps to critical scheduling priority") \ 3564 \ 3565 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3566 "Compiler thread(s) run at critical scheduling priority") \ 3567 \ 3568 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3569 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3570 \ 3571 /* compiler debugging */ \ 3572 notproduct(intx, CompileTheWorldStartAt, 1, \ 3573 "First class to consider when using +CompileTheWorld") \ 3574 \ 3575 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3576 "Last class to consider when using +CompileTheWorld") \ 3577 \ 3578 develop(intx, NewCodeParameter, 0, \ 3579 "Testing Only: Create a dedicated integer parameter before " \ 3580 "putback") \ 3581 \ 3582 /* new oopmap storage allocation */ \ 3583 develop(intx, MinOopMapAllocation, 8, \ 3584 "Minimum number of OopMap entries in an OopMapSet") \ 3585 \ 3586 /* Background Compilation */ \ 3587 develop(intx, LongCompileThreshold, 50, \ 3588 "Used with +TraceLongCompiles") \ 3589 \ 3590 /* recompilation */ \ 3591 product_pd(intx, CompileThreshold, \ 3592 "number of interpreted method invocations before (re-)compiling") \ 3593 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3594 \ 3595 product(double, CompileThresholdScaling, 1.0, \ 3596 "Factor to control when first compilation happens " \ 3597 "(both with and without tiered compilation): " \ 3598 "values greater than 1.0 delay counter overflow, " \ 3599 "values between 0 and 1.0 rush counter overflow, " \ 3600 "value of 1.0 leaves compilation thresholds unchanged " \ 3601 "value of 0.0 is equivalent to -Xint. " \ 3602 "" \ 3603 "Flag can be set as per-method option. " \ 3604 "If a value is specified for a method, compilation thresholds " \ 3605 "for that method are scaled by both the value of the global flag "\ 3606 "and the value of the per-method flag.") \ 3607 range(0.0, DBL_MAX) \ 3608 \ 3609 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3610 "Interpreter (tier 0) invocation notification frequency") \ 3611 range(0, 30) \ 3612 \ 3613 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3614 "C1 without MDO (tier 2) invocation notification frequency") \ 3615 range(0, 30) \ 3616 \ 3617 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3618 "C1 with MDO profiling (tier 3) invocation notification " \ 3619 "frequency") \ 3620 range(0, 30) \ 3621 \ 3622 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3623 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3624 range(0, 30) \ 3625 \ 3626 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3627 "Interpreter (tier 0) invocation notification frequency") \ 3628 range(0, 30) \ 3629 \ 3630 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3631 "C1 without MDO (tier 2) invocation notification frequency") \ 3632 range(0, 30) \ 3633 \ 3634 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3635 "C1 with MDO profiling (tier 3) invocation notification " \ 3636 "frequency") \ 3637 range(0, 30) \ 3638 \ 3639 product(intx, Tier2CompileThreshold, 0, \ 3640 "threshold at which tier 2 compilation is invoked") \ 3641 range(0, max_jint) \ 3642 \ 3643 product(intx, Tier2BackEdgeThreshold, 0, \ 3644 "Back edge threshold at which tier 2 compilation is invoked") \ 3645 range(0, max_jint) \ 3646 \ 3647 product(intx, Tier3InvocationThreshold, 200, \ 3648 "Compile if number of method invocations crosses this " \ 3649 "threshold") \ 3650 range(0, max_jint) \ 3651 \ 3652 product(intx, Tier3MinInvocationThreshold, 100, \ 3653 "Minimum invocation to compile at tier 3") \ 3654 range(0, max_jint) \ 3655 \ 3656 product(intx, Tier3CompileThreshold, 2000, \ 3657 "Threshold at which tier 3 compilation is invoked (invocation " \ 3658 "minimum must be satisfied)") \ 3659 range(0, max_jint) \ 3660 \ 3661 product(intx, Tier3BackEdgeThreshold, 60000, \ 3662 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3663 range(0, max_jint) \ 3664 \ 3665 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3666 "Compile if number of method invocations crosses this " \ 3667 "threshold if coming from AOT") \ 3668 range(0, max_jint) \ 3669 \ 3670 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3671 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3672 range(0, max_jint) \ 3673 \ 3674 product(intx, Tier3AOTCompileThreshold, 15000, \ 3675 "Threshold at which tier 3 compilation is invoked (invocation " \ 3676 "minimum must be satisfied) if coming from AOT") \ 3677 range(0, max_jint) \ 3678 \ 3679 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3680 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3681 "if coming from AOT") \ 3682 range(0, max_jint) \ 3683 \ 3684 product(intx, Tier4InvocationThreshold, 5000, \ 3685 "Compile if number of method invocations crosses this " \ 3686 "threshold") \ 3687 range(0, max_jint) \ 3688 \ 3689 product(intx, Tier4MinInvocationThreshold, 600, \ 3690 "Minimum invocation to compile at tier 4") \ 3691 range(0, max_jint) \ 3692 \ 3693 product(intx, Tier4CompileThreshold, 15000, \ 3694 "Threshold at which tier 4 compilation is invoked (invocation " \ 3695 "minimum must be satisfied") \ 3696 range(0, max_jint) \ 3697 \ 3698 product(intx, Tier4BackEdgeThreshold, 40000, \ 3699 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3700 range(0, max_jint) \ 3701 \ 3702 product(intx, Tier3DelayOn, 5, \ 3703 "If C2 queue size grows over this amount per compiler thread " \ 3704 "stop compiling at tier 3 and start compiling at tier 2") \ 3705 range(0, max_jint) \ 3706 \ 3707 product(intx, Tier3DelayOff, 2, \ 3708 "If C2 queue size is less than this amount per compiler thread " \ 3709 "allow methods compiled at tier 2 transition to tier 3") \ 3710 range(0, max_jint) \ 3711 \ 3712 product(intx, Tier3LoadFeedback, 5, \ 3713 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3714 "reaches this amount per compiler thread") \ 3715 range(0, max_jint) \ 3716 \ 3717 product(intx, Tier4LoadFeedback, 3, \ 3718 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3719 "reaches this amount per compiler thread") \ 3720 range(0, max_jint) \ 3721 \ 3722 product(intx, TieredCompileTaskTimeout, 50, \ 3723 "Kill compile task if method was not used within " \ 3724 "given timeout in milliseconds") \ 3725 range(0, max_intx) \ 3726 \ 3727 product(intx, TieredStopAtLevel, 4, \ 3728 "Stop at given compilation level") \ 3729 range(0, 4) \ 3730 \ 3731 product(intx, Tier0ProfilingStartPercentage, 200, \ 3732 "Start profiling in interpreter if the counters exceed tier 3 " \ 3733 "thresholds by the specified percentage") \ 3734 range(0, max_jint) \ 3735 \ 3736 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3737 "Increase the compile threshold for C1 compilation if the code " \ 3738 "cache is filled by the specified percentage") \ 3739 range(0, 99) \ 3740 \ 3741 product(intx, TieredRateUpdateMinTime, 1, \ 3742 "Minimum rate sampling interval (in milliseconds)") \ 3743 range(0, max_intx) \ 3744 \ 3745 product(intx, TieredRateUpdateMaxTime, 25, \ 3746 "Maximum rate sampling interval (in milliseconds)") \ 3747 range(0, max_intx) \ 3748 \ 3749 product_pd(bool, TieredCompilation, \ 3750 "Enable tiered compilation") \ 3751 \ 3752 product(bool, PrintTieredEvents, false, \ 3753 "Print tiered events notifications") \ 3754 \ 3755 product_pd(intx, OnStackReplacePercentage, \ 3756 "NON_TIERED number of method invocations/branches (expressed as " \ 3757 "% of CompileThreshold) before (re-)compiling OSR code") \ 3758 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3759 \ 3760 product(intx, InterpreterProfilePercentage, 33, \ 3761 "NON_TIERED number of method invocations/branches (expressed as " \ 3762 "% of CompileThreshold) before profiling in the interpreter") \ 3763 range(0, 100) \ 3764 \ 3765 develop(intx, MaxRecompilationSearchLength, 10, \ 3766 "The maximum number of frames to inspect when searching for " \ 3767 "recompilee") \ 3768 \ 3769 develop(intx, MaxInterpretedSearchLength, 3, \ 3770 "The maximum number of interpreted frames to skip when searching "\ 3771 "for recompilee") \ 3772 \ 3773 develop(intx, DesiredMethodLimit, 8000, \ 3774 "The desired maximum method size (in bytecodes) after inlining") \ 3775 \ 3776 develop(intx, HugeMethodLimit, 8000, \ 3777 "Don't compile methods larger than this if " \ 3778 "+DontCompileHugeMethods") \ 3779 \ 3780 /* New JDK 1.4 reflection implementation */ \ 3781 \ 3782 develop(intx, FastSuperclassLimit, 8, \ 3783 "Depth of hardwired instanceof accelerator array") \ 3784 \ 3785 /* Properties for Java libraries */ \ 3786 \ 3787 product(uint64_t, MaxDirectMemorySize, 0, \ 3788 "Maximum total size of NIO direct-buffer allocations") \ 3789 range(0, max_jlong) \ 3790 \ 3791 /* Flags used for temporary code during development */ \ 3792 \ 3793 diagnostic(bool, UseNewCode, false, \ 3794 "Testing Only: Use the new version while testing") \ 3795 \ 3796 diagnostic(bool, UseNewCode2, false, \ 3797 "Testing Only: Use the new version while testing") \ 3798 \ 3799 diagnostic(bool, UseNewCode3, false, \ 3800 "Testing Only: Use the new version while testing") \ 3801 \ 3802 /* flags for performance data collection */ \ 3803 \ 3804 product(bool, UsePerfData, true, \ 3805 "Flag to disable jvmstat instrumentation for performance testing "\ 3806 "and problem isolation purposes") \ 3807 \ 3808 product(bool, PerfDataSaveToFile, false, \ 3809 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3810 \ 3811 product(ccstr, PerfDataSaveFile, NULL, \ 3812 "Save PerfData memory to the specified absolute pathname. " \ 3813 "The string %p in the file name (if present) " \ 3814 "will be replaced by pid") \ 3815 \ 3816 product(intx, PerfDataSamplingInterval, 50, \ 3817 "Data sampling interval (in milliseconds)") \ 3818 range(PeriodicTask::min_interval, max_jint) \ 3819 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3820 \ 3821 product(bool, PerfDisableSharedMem, false, \ 3822 "Store performance data in standard memory") \ 3823 \ 3824 product(intx, PerfDataMemorySize, 32*K, \ 3825 "Size of performance data memory region. Will be rounded " \ 3826 "up to a multiple of the native os page size.") \ 3827 range(128, 32*64*K) \ 3828 \ 3829 product(intx, PerfMaxStringConstLength, 1024, \ 3830 "Maximum PerfStringConstant string length before truncation") \ 3831 range(32, 32*K) \ 3832 \ 3833 product(bool, PerfAllowAtExitRegistration, false, \ 3834 "Allow registration of atexit() methods") \ 3835 \ 3836 product(bool, PerfBypassFileSystemCheck, false, \ 3837 "Bypass Win32 file system criteria checks (Windows Only)") \ 3838 \ 3839 product(intx, UnguardOnExecutionViolation, 0, \ 3840 "Unguard page and retry on no-execute fault (Win32 only) " \ 3841 "0=off, 1=conservative, 2=aggressive") \ 3842 range(0, 2) \ 3843 \ 3844 /* Serviceability Support */ \ 3845 \ 3846 product(bool, ManagementServer, false, \ 3847 "Create JMX Management Server") \ 3848 \ 3849 product(bool, DisableAttachMechanism, false, \ 3850 "Disable mechanism that allows tools to attach to this VM") \ 3851 \ 3852 product(bool, StartAttachListener, false, \ 3853 "Always start Attach Listener at VM startup") \ 3854 \ 3855 product(bool, EnableDynamicAgentLoading, true, \ 3856 "Allow tools to load agents with the attach mechanism") \ 3857 \ 3858 manageable(bool, PrintConcurrentLocks, false, \ 3859 "Print java.util.concurrent locks in thread dump") \ 3860 \ 3861 product(bool, TransmitErrorReport, false, \ 3862 "Enable error report transmission on erroneous termination") \ 3863 \ 3864 product(ccstr, ErrorReportServer, NULL, \ 3865 "Override built-in error report server address") \ 3866 \ 3867 /* Shared spaces */ \ 3868 \ 3869 product(bool, UseSharedSpaces, true, \ 3870 "Use shared spaces for metadata") \ 3871 \ 3872 product(bool, VerifySharedSpaces, false, \ 3873 "Verify shared spaces (false for default archive, true for " \ 3874 "archive specified by -XX:SharedArchiveFile)") \ 3875 \ 3876 product(bool, RequireSharedSpaces, false, \ 3877 "Require shared spaces for metadata") \ 3878 \ 3879 product(bool, DumpSharedSpaces, false, \ 3880 "Special mode: JVM reads a class list, loads classes, builds " \ 3881 "shared spaces, and dumps the shared spaces to a file to be " \ 3882 "used in future JVM runs") \ 3883 \ 3884 product(bool, PrintSharedArchiveAndExit, false, \ 3885 "Print shared archive file contents") \ 3886 \ 3887 product(bool, PrintSharedDictionary, false, \ 3888 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3889 "dictionary") \ 3890 \ 3891 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3892 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3893 "Address to allocate shared memory region for class data") \ 3894 range(0, SIZE_MAX) \ 3895 \ 3896 product(bool, UseAppCDS, false, \ 3897 "Enable Application Class Data Sharing when using shared spaces") \ 3898 writeable(CommandLineOnly) \ 3899 \ 3900 product(ccstr, SharedArchiveConfigFile, NULL, \ 3901 "Data to add to the CDS archive file") \ 3902 \ 3903 product(uintx, SharedSymbolTableBucketSize, 4, \ 3904 "Average number of symbols per bucket in shared table") \ 3905 range(2, 246) \ 3906 \ 3907 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \ 3908 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3909 "classes. Just exclude them from the shared dictionary.") \ 3910 \ 3911 diagnostic(bool, PrintMethodHandleStubs, false, \ 3912 "Print generated stub code for method handles") \ 3913 \ 3914 develop(bool, TraceMethodHandles, false, \ 3915 "trace internal method handle operations") \ 3916 \ 3917 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3918 "perform extra checks when constructing method handles") \ 3919 \ 3920 diagnostic(bool, ShowHiddenFrames, false, \ 3921 "show method handle implementation frames (usually hidden)") \ 3922 \ 3923 experimental(bool, TrustFinalNonStaticFields, false, \ 3924 "trust final non-static declarations for constant folding") \ 3925 \ 3926 diagnostic(bool, FoldStableValues, true, \ 3927 "Optimize loads from stable fields (marked w/ @Stable)") \ 3928 \ 3929 develop(bool, TraceInvokeDynamic, false, \ 3930 "trace internal invoke dynamic operations") \ 3931 \ 3932 diagnostic(int, UseBootstrapCallInfo, 1, \ 3933 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 3934 "resolved before the bootstrap method is called; 1: when a BSM " \ 3935 "that may accept a BootstrapCallInfo is detected, use that API " \ 3936 "to pass BSM arguments, which allows the BSM to delay their " \ 3937 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 3938 "via that API, instead of with the eagerly-resolved array.") \ 3939 \ 3940 diagnostic(bool, PauseAtStartup, false, \ 3941 "Causes the VM to pause at startup time and wait for the pause " \ 3942 "file to be removed (default: ./vm.paused.<pid>)") \ 3943 \ 3944 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3945 "The file to create and for whose removal to await when pausing " \ 3946 "at startup. (default: ./vm.paused.<pid>)") \ 3947 \ 3948 diagnostic(bool, PauseAtExit, false, \ 3949 "Pause and wait for keypress on exit if a debugger is attached") \ 3950 \ 3951 product(bool, ExtendedDTraceProbes, false, \ 3952 "Enable performance-impacting dtrace probes") \ 3953 \ 3954 product(bool, DTraceMethodProbes, false, \ 3955 "Enable dtrace probes for method-entry and method-exit") \ 3956 \ 3957 product(bool, DTraceAllocProbes, false, \ 3958 "Enable dtrace probes for object allocation") \ 3959 \ 3960 product(bool, DTraceMonitorProbes, false, \ 3961 "Enable dtrace probes for monitor events") \ 3962 \ 3963 product(bool, RelaxAccessControlCheck, false, \ 3964 "Relax the access control checks in the verifier") \ 3965 \ 3966 product(uintx, StringTableSize, defaultStringTableSize, \ 3967 "Number of buckets in the interned String table") \ 3968 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3969 \ 3970 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3971 "Number of buckets in the JVM internal Symbol table") \ 3972 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3973 \ 3974 product(bool, UseStringDeduplication, false, \ 3975 "Use string deduplication") \ 3976 \ 3977 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3978 "A string must reach this age (or be promoted to an old region) " \ 3979 "to be considered for deduplication") \ 3980 range(1, markOopDesc::max_age) \ 3981 \ 3982 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3983 "Force table resize every time the table is scanned") \ 3984 \ 3985 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3986 "Force table rehash every time the table is scanned") \ 3987 \ 3988 diagnostic(bool, WhiteBoxAPI, false, \ 3989 "Enable internal testing APIs") \ 3990 \ 3991 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3992 "Default survivor space alignment in bytes") \ 3993 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 3994 \ 3995 product(bool , AllowNonVirtualCalls, false, \ 3996 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3997 \ 3998 product(ccstr, DumpLoadedClassList, NULL, \ 3999 "Dump the names all loaded classes, that could be stored into " \ 4000 "the CDS archive, in the specified file") \ 4001 \ 4002 product(ccstr, SharedClassListFile, NULL, \ 4003 "Override the default CDS class list") \ 4004 \ 4005 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4006 "Override the default location of the CDS archive file") \ 4007 \ 4008 product(ccstr, ExtraSharedClassListFile, NULL, \ 4009 "Extra classlist for building the CDS archive file") \ 4010 \ 4011 experimental(size_t, ArrayAllocatorMallocLimit, \ 4012 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4013 "Allocation less than this value will be allocated " \ 4014 "using malloc. Larger allocations will use mmap.") \ 4015 \ 4016 experimental(bool, AlwaysAtomicAccesses, false, \ 4017 "Accesses to all variables should always be atomic") \ 4018 \ 4019 product(bool, EnableTracing, false, \ 4020 "Enable event-based tracing") \ 4021 \ 4022 product(bool, UseLockedTracing, false, \ 4023 "Use locked-tracing when doing event-based tracing") \ 4024 \ 4025 diagnostic(bool, UseUnalignedAccesses, false, \ 4026 "Use unaligned memory accesses in Unsafe") \ 4027 \ 4028 product_pd(bool, PreserveFramePointer, \ 4029 "Use the FP register for holding the frame pointer " \ 4030 "and not as a general purpose register.") \ 4031 \ 4032 diagnostic(bool, CheckIntrinsics, true, \ 4033 "When a class C is loaded, check that " \ 4034 "(1) all intrinsics defined by the VM for class C are present "\ 4035 "in the loaded class file and are marked with the " \ 4036 "@HotSpotIntrinsicCandidate annotation, that " \ 4037 "(2) there is an intrinsic registered for all loaded methods " \ 4038 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4039 "annotation, and that " \ 4040 "(3) no orphan methods exist for class C (i.e., methods for " \ 4041 "which the VM declares an intrinsic but that are not declared "\ 4042 "in the loaded class C. " \ 4043 "Check (3) is available only in debug builds.") \ 4044 \ 4045 diagnostic_pd(intx, InitArrayShortSize, \ 4046 "Threshold small size (in bytes) for clearing arrays. " \ 4047 "Anything this size or smaller may get converted to discrete " \ 4048 "scalar stores.") \ 4049 range(0, max_intx) \ 4050 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4051 \ 4052 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4053 "Disable backwards compatibility for compile commands.") \ 4054 \ 4055 diagnostic(bool, CompilerDirectivesPrint, false, \ 4056 "Print compiler directives on installation.") \ 4057 diagnostic(int, CompilerDirectivesLimit, 50, \ 4058 "Limit on number of compiler directives.") \ 4059 \ 4060 product(ccstr, AllocateHeapAt, NULL, \ 4061 "Path to the directoy where a temporary file will be created " \ 4062 "to use as the backing store for Java Heap.") 4063 4064 4065 /* 4066 * Macros for factoring of globals 4067 */ 4068 4069 // Interface macros 4070 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4071 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4072 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4073 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4074 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4075 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4076 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4077 #ifdef PRODUCT 4078 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4079 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4080 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4081 #else 4082 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4083 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4084 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4085 #endif // PRODUCT 4086 // Special LP64 flags, product only needed for now. 4087 #ifdef _LP64 4088 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4089 #else 4090 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4091 #endif // _LP64 4092 4093 // Implementation macros 4094 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4095 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4096 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4097 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4098 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4099 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4100 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4101 #ifdef PRODUCT 4102 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4103 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4104 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4105 #else 4106 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4107 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4108 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4109 #endif // PRODUCT 4110 #ifdef _LP64 4111 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4112 #else 4113 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4114 #endif // _LP64 4115 4116 // Only materialize src code for range checking when required, ignore otherwise 4117 #define IGNORE_RANGE(a, b) 4118 // Only materialize src code for contraint checking when required, ignore otherwise 4119 #define IGNORE_CONSTRAINT(func,type) 4120 4121 #define IGNORE_WRITEABLE(type) 4122 4123 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4124 DECLARE_PD_DEVELOPER_FLAG, \ 4125 DECLARE_PRODUCT_FLAG, \ 4126 DECLARE_PD_PRODUCT_FLAG, \ 4127 DECLARE_DIAGNOSTIC_FLAG, \ 4128 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4129 DECLARE_EXPERIMENTAL_FLAG, \ 4130 DECLARE_NOTPRODUCT_FLAG, \ 4131 DECLARE_MANAGEABLE_FLAG, \ 4132 DECLARE_PRODUCT_RW_FLAG, \ 4133 DECLARE_LP64_PRODUCT_FLAG, \ 4134 IGNORE_RANGE, \ 4135 IGNORE_CONSTRAINT, \ 4136 IGNORE_WRITEABLE) 4137 4138 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4139 DECLARE_PD_DEVELOPER_FLAG, \ 4140 DECLARE_PRODUCT_FLAG, \ 4141 DECLARE_PD_PRODUCT_FLAG, \ 4142 DECLARE_DIAGNOSTIC_FLAG, \ 4143 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4144 DECLARE_NOTPRODUCT_FLAG, \ 4145 IGNORE_RANGE, \ 4146 IGNORE_CONSTRAINT, \ 4147 IGNORE_WRITEABLE) 4148 4149 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4150 DECLARE_PRODUCT_FLAG, \ 4151 DECLARE_DIAGNOSTIC_FLAG, \ 4152 DECLARE_EXPERIMENTAL_FLAG, \ 4153 DECLARE_NOTPRODUCT_FLAG, \ 4154 IGNORE_RANGE, \ 4155 IGNORE_CONSTRAINT, \ 4156 IGNORE_WRITEABLE) 4157 4158 // Extensions 4159 4160 #include "runtime/globals_ext.hpp" 4161 4162 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP