1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/align.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 31 32 #include <float.h> // for DBL_MAX 33 34 // The larger HeapWordSize for 64bit requires larger heaps 35 // for the same application running in 64bit. See bug 4967770. 36 // The minimum alignment to a heap word size is done. Other 37 // parts of the memory system may require additional alignment 38 // and are responsible for those alignments. 39 #ifdef _LP64 40 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize) 41 #else 42 #define ScaleForWordSize(x) (x) 43 #endif 44 45 // use this for flags that are true per default in the tiered build 46 // but false in non-tiered builds, and vice versa 47 #ifdef TIERED 48 #define trueInTiered true 49 #define falseInTiered false 50 #else 51 #define trueInTiered false 52 #define falseInTiered true 53 #endif 54 55 #include CPU_HEADER(globals) 56 #include OS_HEADER(globals) 57 #include OS_CPU_HEADER(globals) 58 #ifdef COMPILER1 59 #include CPU_HEADER(c1_globals) 60 #include OS_HEADER(c1_globals) 61 #endif 62 #ifdef COMPILER2 63 #include CPU_HEADER(c2_globals) 64 #include OS_HEADER(c2_globals) 65 #endif 66 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(intx, InlineClassNatives, true); 86 define_pd_global(intx, InlineUnsafeOps, true); 87 define_pd_global(intx, InitialCodeCacheSize, 160*K); 88 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 89 define_pd_global(intx, NonProfiledCodeHeapSize, 0); 90 define_pd_global(intx, ProfiledCodeHeapSize, 0); 91 define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 92 93 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 94 define_pd_global(intx, CodeCacheMinBlockLength, 1); 95 define_pd_global(intx, 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_and_origin(outputStream* st); 293 void print_as_flag(outputStream* st); 294 295 static const char* flag_error_str(Flag::Error error); 296 }; 297 298 // debug flags control various aspects of the VM and are global accessible 299 300 // use FlagSetting to temporarily change some debug flag 301 // e.g. FlagSetting fs(DebugThisAndThat, true); 302 // restored to previous value upon leaving scope 303 class FlagSetting { 304 bool val; 305 bool* flag; 306 public: 307 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 308 ~FlagSetting() { *flag = val; } 309 }; 310 311 312 class CounterSetting { 313 intx* counter; 314 public: 315 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 316 ~CounterSetting() { (*counter)--; } 317 }; 318 319 class IntFlagSetting { 320 int val; 321 int* flag; 322 public: 323 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 324 ~IntFlagSetting() { *flag = val; } 325 }; 326 327 class UIntFlagSetting { 328 uint val; 329 uint* flag; 330 public: 331 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 332 ~UIntFlagSetting() { *flag = val; } 333 }; 334 335 class UIntXFlagSetting { 336 uintx val; 337 uintx* flag; 338 public: 339 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 340 ~UIntXFlagSetting() { *flag = val; } 341 }; 342 343 class DoubleFlagSetting { 344 double val; 345 double* flag; 346 public: 347 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 348 ~DoubleFlagSetting() { *flag = val; } 349 }; 350 351 class SizeTFlagSetting { 352 size_t val; 353 size_t* flag; 354 public: 355 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 356 ~SizeTFlagSetting() { *flag = val; } 357 }; 358 359 // Helper class for temporarily saving the value of a flag during a scope. 360 template <size_t SIZE> 361 class FlagGuard { 362 unsigned char _value[SIZE]; 363 void* const _addr; 364 365 // Hide operator new, this class should only be allocated on the stack. 366 // NOTE: Cannot include memory/allocation.hpp here due to circular 367 // dependencies. 368 void* operator new(size_t size) throw(); 369 void* operator new [](size_t size) throw(); 370 371 public: 372 FlagGuard(void* flag_addr) : _addr(flag_addr) { 373 memcpy(_value, _addr, SIZE); 374 } 375 376 ~FlagGuard() { 377 memcpy(_addr, _value, SIZE); 378 } 379 }; 380 381 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 382 383 class CommandLineFlags { 384 public: 385 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 386 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); } 387 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 388 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 389 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 390 391 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 392 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); } 393 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 394 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 395 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 396 397 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 398 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); } 399 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 400 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 401 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 402 403 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 404 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); } 405 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 406 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 407 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 408 409 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 410 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); } 411 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 412 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 413 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 414 415 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 416 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); } 417 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 418 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 419 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 420 421 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 422 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); } 423 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 424 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 425 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 426 427 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 428 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); } 429 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 430 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 431 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 432 433 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 434 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); } 435 // Contract: Flag will make private copy of the incoming value. 436 // Outgoing value is always malloc-ed, and caller MUST call free. 437 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 438 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 439 440 // Returns false if name is not a command line flag. 441 static bool wasSetOnCmdline(const char* name, bool* value); 442 static void printSetFlags(outputStream* out); 443 444 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 445 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 446 447 static void verify() PRODUCT_RETURN; 448 }; 449 450 // use this for flags that are true by default in the debug version but 451 // false in the optimized version, and vice versa 452 #ifdef ASSERT 453 #define trueInDebug true 454 #define falseInDebug false 455 #else 456 #define trueInDebug false 457 #define falseInDebug true 458 #endif 459 460 // use this for flags that are true per default in the product build 461 // but false in development builds, and vice versa 462 #ifdef PRODUCT 463 #define trueInProduct true 464 #define falseInProduct false 465 #else 466 #define trueInProduct false 467 #define falseInProduct true 468 #endif 469 470 // develop flags are settable / visible only during development and are constant in the PRODUCT version 471 // product flags are always settable / visible 472 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 473 474 // A flag must be declared with one of the following types: 475 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 476 // The type "ccstr" is an alias for "const char*" and is used 477 // only in this file, because the macrology requires single-token type names. 478 479 // Note: Diagnostic options not meant for VM tuning or for product modes. 480 // They are to be used for VM quality assurance or field diagnosis 481 // of VM bugs. They are hidden so that users will not be encouraged to 482 // try them as if they were VM ordinary execution options. However, they 483 // are available in the product version of the VM. Under instruction 484 // from support engineers, VM customers can turn them on to collect 485 // diagnostic information about VM problems. To use a VM diagnostic 486 // option, you must first specify +UnlockDiagnosticVMOptions. 487 // (This master switch also affects the behavior of -Xprintflags.) 488 // 489 // experimental flags are in support of features that are not 490 // part of the officially supported product, but are available 491 // for experimenting with. They could, for example, be performance 492 // features that may not have undergone full or rigorous QA, but which may 493 // help performance in some cases and released for experimentation 494 // by the community of users and developers. This flag also allows one to 495 // be able to build a fully supported product that nonetheless also 496 // ships with some unsupported, lightly tested, experimental features. 497 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 498 // UnlockExperimentalVMOptions flag, which allows the control and 499 // modification of the experimental flags. 500 // 501 // Nota bene: neither diagnostic nor experimental options should be used casually, 502 // and they are not supported on production loads, except under explicit 503 // direction from support engineers. 504 // 505 // manageable flags are writeable external product flags. 506 // They are dynamically writeable through the JDK management interface 507 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 508 // These flags are external exported interface (see CCC). The list of 509 // manageable flags can be queried programmatically through the management 510 // interface. 511 // 512 // A flag can be made as "manageable" only if 513 // - the flag is defined in a CCC as an external exported interface. 514 // - the VM implementation supports dynamic setting of the flag. 515 // This implies that the VM must *always* query the flag variable 516 // and not reuse state related to the flag state at any given time. 517 // - you want the flag to be queried programmatically by the customers. 518 // 519 // product_rw flags are writeable internal product flags. 520 // They are like "manageable" flags but for internal/private use. 521 // The list of product_rw flags are internal/private flags which 522 // may be changed/removed in a future release. It can be set 523 // through the management interface to get/set value 524 // when the name of flag is supplied. 525 // 526 // A flag can be made as "product_rw" only if 527 // - the VM implementation supports dynamic setting of the flag. 528 // This implies that the VM must *always* query the flag variable 529 // and not reuse state related to the flag state at any given time. 530 // 531 // Note that when there is a need to support develop flags to be writeable, 532 // it can be done in the same way as product_rw. 533 // 534 // range is a macro that will expand to min and max arguments for range 535 // checking code if provided - see commandLineFlagRangeList.hpp 536 // 537 // constraint is a macro that will expand to custom function call 538 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 539 // 540 // writeable is a macro that controls if and how the value can change during the runtime 541 // 542 // writeable(Always) is optional and allows the flag to have its value changed 543 // without any limitations at any time 544 // 545 // writeable(Once) flag value's can be only set once during the lifetime of VM 546 // 547 // writeable(CommandLineOnly) flag value's can be only set from command line 548 // (multiple times allowed) 549 // 550 551 552 #define RUNTIME_FLAGS(develop, \ 553 develop_pd, \ 554 product, \ 555 product_pd, \ 556 diagnostic, \ 557 diagnostic_pd, \ 558 experimental, \ 559 notproduct, \ 560 manageable, \ 561 product_rw, \ 562 lp64_product, \ 563 range, \ 564 constraint, \ 565 writeable) \ 566 \ 567 lp64_product(bool, UseCompressedOops, false, \ 568 "Use 32-bit object references in 64-bit VM. " \ 569 "lp64_product means flag is always constant in 32 bit VM") \ 570 \ 571 lp64_product(bool, UseCompressedClassPointers, false, \ 572 "Use 32-bit class pointers in 64-bit VM. " \ 573 "lp64_product means flag is always constant in 32 bit VM") \ 574 \ 575 notproduct(bool, CheckCompressedOops, true, \ 576 "Generate checks in encoding/decoding code in debug VM") \ 577 \ 578 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 579 "Heap allocation steps through preferred address regions to find" \ 580 " where it can allocate the heap. Number of steps to take per " \ 581 "region.") \ 582 range(1, max_uintx) \ 583 \ 584 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 585 "Default object alignment in bytes, 8 is minimum") \ 586 range(8, 256) \ 587 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 588 \ 589 product(bool, AssumeMP, true, \ 590 "(Deprecated) Instruct the VM to assume multiple processors are available")\ 591 \ 592 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 593 /* removal testing. It was supposed to be removed before FCS but has */ \ 594 /* been re-added (see 6401008) */ \ 595 product_pd(bool, UseMembar, \ 596 "(Unstable) Issues membars on thread state transitions") \ 597 \ 598 develop(bool, CleanChunkPoolAsync, true, \ 599 "Clean the chunk pool asynchronously") \ 600 \ 601 product_pd(bool, ThreadLocalHandshakes, \ 602 "Use thread-local polls instead of global poll for safepoints.") \ 603 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 604 \ 605 diagnostic(uint, HandshakeTimeout, 0, \ 606 "If nonzero set a timeout in milliseconds for handshakes") \ 607 \ 608 experimental(bool, AlwaysSafeConstructors, false, \ 609 "Force safe construction, as if all fields are final.") \ 610 \ 611 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 612 "Enable normal processing of flags relating to field diagnostics")\ 613 \ 614 experimental(bool, UnlockExperimentalVMOptions, false, \ 615 "Enable normal processing of flags relating to experimental " \ 616 "features") \ 617 \ 618 product(bool, JavaMonitorsInStackTrace, true, \ 619 "Print information about Java monitor locks when the stacks are" \ 620 "dumped") \ 621 \ 622 product_pd(bool, UseLargePages, \ 623 "Use large page memory") \ 624 \ 625 product_pd(bool, UseLargePagesIndividualAllocation, \ 626 "Allocate large pages individually for better affinity") \ 627 \ 628 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 629 "Fail large pages individual allocation") \ 630 \ 631 product(bool, UseLargePagesInMetaspace, false, \ 632 "Use large page memory in metaspace. " \ 633 "Only used if UseLargePages is enabled.") \ 634 \ 635 product(bool, UseNUMA, false, \ 636 "Use NUMA if available") \ 637 \ 638 product(bool, UseNUMAInterleaving, false, \ 639 "Interleave memory across NUMA nodes if available") \ 640 \ 641 product(size_t, NUMAInterleaveGranularity, 2*M, \ 642 "Granularity to use for NUMA interleaving on Windows OS") \ 643 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 644 \ 645 product(bool, ForceNUMA, false, \ 646 "Force NUMA optimizations on single-node/UMA systems") \ 647 \ 648 product(uintx, NUMAChunkResizeWeight, 20, \ 649 "Percentage (0-100) used to weight the current sample when " \ 650 "computing exponentially decaying average for " \ 651 "AdaptiveNUMAChunkSizing") \ 652 range(0, 100) \ 653 \ 654 product(size_t, NUMASpaceResizeRate, 1*G, \ 655 "Do not reallocate more than this amount per collection") \ 656 range(0, max_uintx) \ 657 \ 658 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 659 "Enable adaptive chunk sizing for NUMA") \ 660 \ 661 product(bool, NUMAStats, false, \ 662 "Print NUMA stats in detailed heap information") \ 663 \ 664 product(uintx, NUMAPageScanRate, 256, \ 665 "Maximum number of pages to include in the page scan procedure") \ 666 range(0, max_uintx) \ 667 \ 668 product_pd(bool, NeedsDeoptSuspend, \ 669 "True for register window machines (sparc/ia64)") \ 670 \ 671 product(intx, UseSSE, 99, \ 672 "Highest supported SSE instructions set on x86/x64") \ 673 range(0, 99) \ 674 \ 675 product(bool, UseAES, false, \ 676 "Control whether AES instructions are used when available") \ 677 \ 678 product(bool, UseFMA, false, \ 679 "Control whether FMA instructions are used when available") \ 680 \ 681 product(bool, UseSHA, false, \ 682 "Control whether SHA instructions are used when available") \ 683 \ 684 diagnostic(bool, UseGHASHIntrinsics, false, \ 685 "Use intrinsics for GHASH versions of crypto") \ 686 \ 687 product(size_t, LargePageSizeInBytes, 0, \ 688 "Large page size (0 to let VM choose the page size)") \ 689 range(0, max_uintx) \ 690 \ 691 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 692 "Use large pages if maximum heap is at least this big") \ 693 range(0, max_uintx) \ 694 \ 695 product(bool, ForceTimeHighResolution, false, \ 696 "Using high time resolution (for Win32 only)") \ 697 \ 698 develop(bool, TracePcPatching, false, \ 699 "Trace usage of frame::patch_pc") \ 700 \ 701 develop(bool, TraceRelocator, false, \ 702 "Trace the bytecode relocator") \ 703 \ 704 develop(bool, TraceLongCompiles, false, \ 705 "Print out every time compilation is longer than " \ 706 "a given threshold") \ 707 \ 708 develop(bool, SafepointALot, false, \ 709 "Generate a lot of safepoints. This works with " \ 710 "GuaranteedSafepointInterval") \ 711 \ 712 product_pd(bool, BackgroundCompilation, \ 713 "A thread requesting compilation is not blocked during " \ 714 "compilation") \ 715 \ 716 product(bool, PrintVMQWaitTime, false, \ 717 "Print out the waiting time in VM operation queue") \ 718 \ 719 product(bool, MethodFlushing, true, \ 720 "Reclamation of zombie and not-entrant methods") \ 721 \ 722 develop(bool, VerifyStack, false, \ 723 "Verify stack of each thread when it is entering a runtime call") \ 724 \ 725 diagnostic(bool, ForceUnreachable, false, \ 726 "Make all non code cache addresses to be unreachable by " \ 727 "forcing use of 64bit literal fixups") \ 728 \ 729 notproduct(bool, StressDerivedPointers, false, \ 730 "Force scavenge when a derived pointer is detected on stack " \ 731 "after rtm call") \ 732 \ 733 develop(bool, TraceDerivedPointers, false, \ 734 "Trace traversal of derived pointers on stack") \ 735 \ 736 notproduct(bool, TraceCodeBlobStacks, false, \ 737 "Trace stack-walk of codeblobs") \ 738 \ 739 product(bool, PrintJNIResolving, false, \ 740 "Used to implement -v:jni") \ 741 \ 742 notproduct(bool, PrintRewrites, false, \ 743 "Print methods that are being rewritten") \ 744 \ 745 product(bool, UseInlineCaches, true, \ 746 "Use Inline Caches for virtual calls ") \ 747 \ 748 diagnostic(bool, InlineArrayCopy, true, \ 749 "Inline arraycopy native that is known to be part of " \ 750 "base library DLL") \ 751 \ 752 diagnostic(bool, InlineObjectHash, true, \ 753 "Inline Object::hashCode() native that is known to be part " \ 754 "of base library DLL") \ 755 \ 756 diagnostic(bool, InlineNatives, true, \ 757 "Inline natives that are known to be part of base library DLL") \ 758 \ 759 diagnostic(bool, InlineMathNatives, true, \ 760 "Inline SinD, CosD, etc.") \ 761 \ 762 diagnostic(bool, InlineClassNatives, true, \ 763 "Inline Class.isInstance, etc") \ 764 \ 765 diagnostic(bool, InlineThreadNatives, true, \ 766 "Inline Thread.currentThread, etc") \ 767 \ 768 diagnostic(bool, InlineUnsafeOps, true, \ 769 "Inline memory ops (native methods) from Unsafe") \ 770 \ 771 product(bool, CriticalJNINatives, true, \ 772 "Check for critical JNI entry points") \ 773 \ 774 notproduct(bool, StressCriticalJNINatives, false, \ 775 "Exercise register saving code in critical natives") \ 776 \ 777 diagnostic(bool, UseAESIntrinsics, false, \ 778 "Use intrinsics for AES versions of crypto") \ 779 \ 780 diagnostic(bool, UseAESCTRIntrinsics, false, \ 781 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 782 \ 783 diagnostic(bool, UseSHA1Intrinsics, false, \ 784 "Use intrinsics for SHA-1 crypto hash function. " \ 785 "Requires that UseSHA is enabled.") \ 786 \ 787 diagnostic(bool, UseSHA256Intrinsics, false, \ 788 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 789 "Requires that UseSHA is enabled.") \ 790 \ 791 diagnostic(bool, UseSHA512Intrinsics, false, \ 792 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 793 "Requires that UseSHA is enabled.") \ 794 \ 795 diagnostic(bool, UseCRC32Intrinsics, false, \ 796 "use intrinsics for java.util.zip.CRC32") \ 797 \ 798 diagnostic(bool, UseCRC32CIntrinsics, false, \ 799 "use intrinsics for java.util.zip.CRC32C") \ 800 \ 801 diagnostic(bool, UseAdler32Intrinsics, false, \ 802 "use intrinsics for java.util.zip.Adler32") \ 803 \ 804 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 805 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 806 \ 807 diagnostic(ccstrlist, DisableIntrinsic, "", \ 808 "do not expand intrinsics whose (internal) names appear here") \ 809 \ 810 develop(bool, TraceCallFixup, false, \ 811 "Trace all call fixups") \ 812 \ 813 develop(bool, DeoptimizeALot, false, \ 814 "Deoptimize at every exit from the runtime system") \ 815 \ 816 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 817 "A comma separated list of bcis to deoptimize at") \ 818 \ 819 product(bool, DeoptimizeRandom, false, \ 820 "Deoptimize random frames on random exit from the runtime system")\ 821 \ 822 notproduct(bool, ZombieALot, false, \ 823 "Create zombies (non-entrant) at exit from the runtime system") \ 824 \ 825 product(bool, UnlinkSymbolsALot, false, \ 826 "Unlink unreferenced symbols from the symbol table at safepoints")\ 827 \ 828 notproduct(bool, WalkStackALot, false, \ 829 "Trace stack (no print) at every exit from the runtime system") \ 830 \ 831 product(bool, Debugging, false, \ 832 "Set when executing debug methods in debug.cpp " \ 833 "(to prevent triggering assertions)") \ 834 \ 835 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 836 "Enable strict checks that safepoints cannot happen for threads " \ 837 "that use NoSafepointVerifier") \ 838 \ 839 notproduct(bool, VerifyLastFrame, false, \ 840 "Verify oops on last frame on entry to VM") \ 841 \ 842 product(bool, FailOverToOldVerifier, true, \ 843 "Fail over to old verifier when split verifier fails") \ 844 \ 845 develop(bool, ShowSafepointMsgs, false, \ 846 "Show message about safepoint synchronization") \ 847 \ 848 product(bool, SafepointTimeout, false, \ 849 "Time out and warn or fail after SafepointTimeoutDelay " \ 850 "milliseconds if failed to reach safepoint") \ 851 \ 852 develop(bool, DieOnSafepointTimeout, false, \ 853 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 854 \ 855 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 856 /* typically, at most a few retries are needed */ \ 857 product(intx, SuspendRetryCount, 50, \ 858 "Maximum retry count for an external suspend request") \ 859 range(0, max_intx) \ 860 \ 861 product(intx, SuspendRetryDelay, 5, \ 862 "Milliseconds to delay per retry (* current_retry_count)") \ 863 range(0, max_intx) \ 864 \ 865 product(bool, AssertOnSuspendWaitFailure, false, \ 866 "Assert/Guarantee on external suspend wait failure") \ 867 \ 868 product(bool, TraceSuspendWaitFailures, false, \ 869 "Trace external suspend wait failures") \ 870 \ 871 product(bool, MaxFDLimit, true, \ 872 "Bump the number of file descriptors to maximum in Solaris") \ 873 \ 874 diagnostic(bool, LogEvents, true, \ 875 "Enable the various ring buffer event logs") \ 876 \ 877 diagnostic(uintx, LogEventsBufferEntries, 10, \ 878 "Number of ring buffer event logs") \ 879 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 880 \ 881 product(bool, BytecodeVerificationRemote, true, \ 882 "Enable the Java bytecode verifier for remote classes") \ 883 \ 884 product(bool, BytecodeVerificationLocal, false, \ 885 "Enable the Java bytecode verifier for local classes") \ 886 \ 887 develop(bool, ForceFloatExceptions, trueInDebug, \ 888 "Force exceptions on FP stack under/overflow") \ 889 \ 890 develop(bool, VerifyStackAtCalls, false, \ 891 "Verify that the stack pointer is unchanged after calls") \ 892 \ 893 develop(bool, TraceJavaAssertions, false, \ 894 "Trace java language assertions") \ 895 \ 896 notproduct(bool, CheckAssertionStatusDirectives, false, \ 897 "Temporary - see javaClasses.cpp") \ 898 \ 899 notproduct(bool, PrintMallocFree, false, \ 900 "Trace calls to C heap malloc/free allocation") \ 901 \ 902 notproduct(bool, VerifyCodeCache, false, \ 903 "Verify code cache on memory allocation/deallocation") \ 904 \ 905 develop(bool, UseMallocOnly, false, \ 906 "Use only malloc/free for allocation (no resource area/arena)") \ 907 \ 908 develop(bool, PrintMalloc, false, \ 909 "Print all malloc/free calls") \ 910 \ 911 develop(bool, PrintMallocStatistics, false, \ 912 "Print malloc/free statistics") \ 913 \ 914 develop(bool, ZapResourceArea, trueInDebug, \ 915 "Zap freed resource/arena space with 0xABABABAB") \ 916 \ 917 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 918 "Zap freed VM handle space with 0xBCBCBCBC") \ 919 \ 920 develop(bool, ZapJNIHandleArea, trueInDebug, \ 921 "Zap freed JNI handle space with 0xFEFEFEFE") \ 922 \ 923 notproduct(bool, ZapStackSegments, trueInDebug, \ 924 "Zap allocated/freed stack segments with 0xFADFADED") \ 925 \ 926 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 927 "Zap unused heap space with 0xBAADBABE") \ 928 \ 929 develop(bool, CheckZapUnusedHeapArea, false, \ 930 "Check zapping of unused heap space") \ 931 \ 932 develop(bool, ZapFillerObjects, trueInDebug, \ 933 "Zap filler objects with 0xDEAFBABE") \ 934 \ 935 develop(bool, PrintVMMessages, true, \ 936 "Print VM messages on console") \ 937 \ 938 notproduct(uintx, ErrorHandlerTest, 0, \ 939 "If > 0, provokes an error after VM initialization; the value " \ 940 "determines which error to provoke. See test_error_handler() " \ 941 "in vmError.cpp.") \ 942 \ 943 notproduct(uintx, TestCrashInErrorHandler, 0, \ 944 "If > 0, provokes an error inside VM error handler (a secondary " \ 945 "crash). see test_error_handler() in vmError.cpp") \ 946 \ 947 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 948 "If true, tests SafeFetch inside error handler.") \ 949 \ 950 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 951 "If true, simulates an unresponsive error handler.") \ 952 \ 953 develop(bool, Verbose, false, \ 954 "Print additional debugging information from other modes") \ 955 \ 956 develop(bool, PrintMiscellaneous, false, \ 957 "Print uncategorized debugging information (requires +Verbose)") \ 958 \ 959 develop(bool, WizardMode, false, \ 960 "Print much more debugging information") \ 961 \ 962 product(bool, ShowMessageBoxOnError, false, \ 963 "Keep process alive on VM fatal error") \ 964 \ 965 product(bool, CreateCoredumpOnCrash, true, \ 966 "Create core/mini dump on VM fatal error") \ 967 \ 968 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 969 "Timeout, in seconds, to limit the time spent on writing an " \ 970 "error log in case of a crash.") \ 971 range(0, (uint64_t)max_jlong/1000) \ 972 \ 973 product_pd(bool, UseOSErrorReporting, \ 974 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 975 \ 976 product(bool, SuppressFatalErrorMessage, false, \ 977 "Report NO fatal error message (avoid deadlock)") \ 978 \ 979 product(ccstrlist, OnError, "", \ 980 "Run user-defined commands on fatal error; see VMError.cpp " \ 981 "for examples") \ 982 \ 983 product(ccstrlist, OnOutOfMemoryError, "", \ 984 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 985 \ 986 manageable(bool, HeapDumpBeforeFullGC, false, \ 987 "Dump heap to file before any major stop-the-world GC") \ 988 \ 989 manageable(bool, HeapDumpAfterFullGC, false, \ 990 "Dump heap to file after any major stop-the-world GC") \ 991 \ 992 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 993 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 994 \ 995 manageable(ccstr, HeapDumpPath, NULL, \ 996 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 997 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 998 "in the working directory)") \ 999 \ 1000 develop(bool, BreakAtWarning, false, \ 1001 "Execute breakpoint upon encountering VM warning") \ 1002 \ 1003 develop(bool, UseFakeTimers, false, \ 1004 "Tell whether the VM should use system time or a fake timer") \ 1005 \ 1006 product(ccstr, NativeMemoryTracking, "off", \ 1007 "Native memory tracking options") \ 1008 \ 1009 diagnostic(bool, PrintNMTStatistics, false, \ 1010 "Print native memory tracking summary data if it is on") \ 1011 \ 1012 diagnostic(bool, LogCompilation, false, \ 1013 "Log compilation activity in detail to LogFile") \ 1014 \ 1015 product(bool, PrintCompilation, false, \ 1016 "Print compilations") \ 1017 \ 1018 diagnostic(bool, TraceNMethodInstalls, false, \ 1019 "Trace nmethod installation") \ 1020 \ 1021 diagnostic(intx, ScavengeRootsInCode, 2, \ 1022 "0: do not allow scavengable oops in the code cache; " \ 1023 "1: allow scavenging from the code cache; " \ 1024 "2: emit as many constants as the compiler can see") \ 1025 range(0, 2) \ 1026 \ 1027 product(bool, AlwaysRestoreFPU, false, \ 1028 "Restore the FPU control word after every JNI call (expensive)") \ 1029 \ 1030 diagnostic(bool, PrintCompilation2, false, \ 1031 "Print additional statistics per compilation") \ 1032 \ 1033 diagnostic(bool, PrintAdapterHandlers, false, \ 1034 "Print code generated for i2c/c2i adapters") \ 1035 \ 1036 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1037 "Verify that i2c/c2i adapters are called properly") \ 1038 \ 1039 develop(bool, VerifyAdapterSharing, false, \ 1040 "Verify that the code for shared adapters is the equivalent") \ 1041 \ 1042 diagnostic(bool, PrintAssembly, false, \ 1043 "Print assembly code (using external disassembler.so)") \ 1044 \ 1045 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1046 "Print options string passed to disassembler.so") \ 1047 \ 1048 notproduct(bool, PrintNMethodStatistics, false, \ 1049 "Print a summary statistic for the generated nmethods") \ 1050 \ 1051 diagnostic(bool, PrintNMethods, false, \ 1052 "Print assembly code for nmethods when generated") \ 1053 \ 1054 diagnostic(bool, PrintNativeNMethods, false, \ 1055 "Print assembly code for native nmethods when generated") \ 1056 \ 1057 develop(bool, PrintDebugInfo, false, \ 1058 "Print debug information for all nmethods when generated") \ 1059 \ 1060 develop(bool, PrintRelocations, false, \ 1061 "Print relocation information for all nmethods when generated") \ 1062 \ 1063 develop(bool, PrintDependencies, false, \ 1064 "Print dependency information for all nmethods when generated") \ 1065 \ 1066 develop(bool, PrintExceptionHandlers, false, \ 1067 "Print exception handler tables for all nmethods when generated") \ 1068 \ 1069 develop(bool, StressCompiledExceptionHandlers, false, \ 1070 "Exercise compiled exception handlers") \ 1071 \ 1072 develop(bool, InterceptOSException, false, \ 1073 "Start debugger when an implicit OS (e.g. NULL) " \ 1074 "exception happens") \ 1075 \ 1076 product(bool, PrintCodeCache, false, \ 1077 "Print the code cache memory usage when exiting") \ 1078 \ 1079 develop(bool, PrintCodeCache2, false, \ 1080 "Print detailed usage information on the code cache when exiting")\ 1081 \ 1082 product(bool, PrintCodeCacheOnCompilation, false, \ 1083 "Print the code cache memory usage each time a method is " \ 1084 "compiled") \ 1085 \ 1086 diagnostic(bool, PrintStubCode, false, \ 1087 "Print generated stub code") \ 1088 \ 1089 product(bool, StackTraceInThrowable, true, \ 1090 "Collect backtrace in throwable when exception happens") \ 1091 \ 1092 product(bool, OmitStackTraceInFastThrow, true, \ 1093 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1094 \ 1095 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1096 "Print bytecode statistics when dumping profiler output") \ 1097 \ 1098 product(bool, ProfilerRecordPC, false, \ 1099 "Collect ticks for each 16 byte interval of compiled code") \ 1100 \ 1101 product(bool, ProfileVM, false, \ 1102 "Profile ticks that fall within VM (either in the VM Thread " \ 1103 "or VM code called through stubs)") \ 1104 \ 1105 product(bool, ProfileIntervals, false, \ 1106 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1107 \ 1108 notproduct(bool, ProfilerCheckIntervals, false, \ 1109 "Collect and print information on spacing of profiler ticks") \ 1110 \ 1111 product(bool, PrintWarnings, true, \ 1112 "Print JVM warnings to output stream") \ 1113 \ 1114 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1115 "Print warnings for stalled SpinLocks") \ 1116 \ 1117 product(bool, RegisterFinalizersAtInit, true, \ 1118 "Register finalizable objects at end of Object.<init> or " \ 1119 "after allocation") \ 1120 \ 1121 develop(bool, RegisterReferences, true, \ 1122 "Tell whether the VM should register soft/weak/final/phantom " \ 1123 "references") \ 1124 \ 1125 develop(bool, IgnoreRewrites, false, \ 1126 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1127 "This is unsafe!") \ 1128 \ 1129 develop(bool, PrintCodeCacheExtension, false, \ 1130 "Print extension of code cache") \ 1131 \ 1132 develop(bool, UsePrivilegedStack, true, \ 1133 "Enable the security JVM functions") \ 1134 \ 1135 develop(bool, ProtectionDomainVerification, true, \ 1136 "Verify protection domain before resolution in system dictionary")\ 1137 \ 1138 product(bool, ClassUnloading, true, \ 1139 "Do unloading of classes") \ 1140 \ 1141 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1142 "Do unloading of classes with a concurrent marking cycle") \ 1143 \ 1144 develop(bool, DisableStartThread, false, \ 1145 "Disable starting of additional Java threads " \ 1146 "(for debugging only)") \ 1147 \ 1148 develop(bool, MemProfiling, false, \ 1149 "Write memory usage profiling to log file") \ 1150 \ 1151 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1152 "Print the system dictionary at exit") \ 1153 \ 1154 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 1155 "Dynamically resize system dictionaries as needed") \ 1156 \ 1157 diagnostic(bool, UnsyncloadClass, false, \ 1158 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1159 "class loader must call VM synchronized for findClass " \ 1160 "and defineClass.") \ 1161 \ 1162 product(bool, AlwaysLockClassLoader, false, \ 1163 "Require the VM to acquire the class loader lock before calling " \ 1164 "loadClass() even for class loaders registering " \ 1165 "as parallel capable") \ 1166 \ 1167 product(bool, AllowParallelDefineClass, false, \ 1168 "Allow parallel defineClass requests for class loaders " \ 1169 "registering as parallel capable") \ 1170 \ 1171 product(bool, MustCallLoadClassInternal, false, \ 1172 "Call loadClassInternal() rather than loadClass()") \ 1173 \ 1174 product_pd(bool, DontYieldALot, \ 1175 "Throw away obvious excess yield calls") \ 1176 \ 1177 develop(bool, UseDetachedThreads, true, \ 1178 "Use detached threads that are recycled upon termination " \ 1179 "(for Solaris only)") \ 1180 \ 1181 product(bool, UseLWPSynchronization, true, \ 1182 "Use LWP-based instead of libthread-based synchronization " \ 1183 "(SPARC only)") \ 1184 \ 1185 experimental(ccstr, SyncKnobs, NULL, \ 1186 "(Unstable) Various monitor synchronization tunables") \ 1187 \ 1188 experimental(intx, EmitSync, 0, \ 1189 "(Unsafe, Unstable) " \ 1190 "Control emission of inline sync fast-path code") \ 1191 \ 1192 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1193 range(0, max_jint) \ 1194 \ 1195 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1196 \ 1197 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 1198 "Percentage of used monitors before triggering cleanup " \ 1199 "safepoint which deflates monitors (0 is off). " \ 1200 "The check is performed on GuaranteedSafepointInterval.") \ 1201 range(0, 100) \ 1202 \ 1203 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1204 "Experimental Sync flags") \ 1205 \ 1206 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1207 \ 1208 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1209 \ 1210 experimental(intx, hashCode, 5, \ 1211 "(Unstable) select hashCode generation algorithm") \ 1212 \ 1213 product(bool, FilterSpuriousWakeups, true, \ 1214 "When true prevents OS-level spurious, or premature, wakeups " \ 1215 "from Object.wait (Ignored for Windows)") \ 1216 \ 1217 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1218 \ 1219 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1220 \ 1221 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1222 \ 1223 develop(bool, UsePthreads, false, \ 1224 "Use pthread-based instead of libthread-based synchronization " \ 1225 "(SPARC only)") \ 1226 \ 1227 product(bool, ReduceSignalUsage, false, \ 1228 "Reduce the use of OS signals in Java and/or the VM") \ 1229 \ 1230 develop_pd(bool, ShareVtableStubs, \ 1231 "Share vtable stubs (smaller code but worse branch prediction") \ 1232 \ 1233 develop(bool, LoadLineNumberTables, true, \ 1234 "Tell whether the class file parser loads line number tables") \ 1235 \ 1236 develop(bool, LoadLocalVariableTables, true, \ 1237 "Tell whether the class file parser loads local variable tables") \ 1238 \ 1239 develop(bool, LoadLocalVariableTypeTables, true, \ 1240 "Tell whether the class file parser loads local variable type" \ 1241 "tables") \ 1242 \ 1243 product(bool, AllowUserSignalHandlers, false, \ 1244 "Do not complain if the application installs signal handlers " \ 1245 "(Solaris & Linux only)") \ 1246 \ 1247 product(bool, UseSignalChaining, true, \ 1248 "Use signal-chaining to invoke signal handlers installed " \ 1249 "by the application (Solaris & Linux only)") \ 1250 \ 1251 product(bool, AllowJNIEnvProxy, false, \ 1252 "Allow JNIEnv proxies for jdbx") \ 1253 \ 1254 product(bool, RestoreMXCSROnJNICalls, false, \ 1255 "Restore MXCSR when returning from JNI calls") \ 1256 \ 1257 product(bool, CheckJNICalls, false, \ 1258 "Verify all arguments to JNI calls") \ 1259 \ 1260 product(bool, CheckEndorsedAndExtDirs, false, \ 1261 "Verify the endorsed and extension directories are not used") \ 1262 \ 1263 product(bool, UseFastJNIAccessors, true, \ 1264 "Use optimized versions of Get<Primitive>Field") \ 1265 \ 1266 product(intx, MaxJNILocalCapacity, 65536, \ 1267 "Maximum allowable local JNI handle capacity to " \ 1268 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1269 "where <= 0 is unlimited, default: 65536") \ 1270 range(min_intx, max_intx) \ 1271 \ 1272 product(bool, EagerXrunInit, false, \ 1273 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1274 "but not all -Xrun libraries may support the state of the VM " \ 1275 "at this time") \ 1276 \ 1277 product(bool, PreserveAllAnnotations, false, \ 1278 "Preserve RuntimeInvisibleAnnotations as well " \ 1279 "as RuntimeVisibleAnnotations") \ 1280 \ 1281 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1282 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1283 \ 1284 product(bool, UseXMMForArrayCopy, false, \ 1285 "Use SSE2 MOVQ instruction for Arraycopy") \ 1286 \ 1287 product(intx, FieldsAllocationStyle, 1, \ 1288 "0 - type based with oops first, " \ 1289 "1 - with oops last, " \ 1290 "2 - oops in super and sub classes are together") \ 1291 range(0, 2) \ 1292 \ 1293 product(bool, CompactFields, true, \ 1294 "Allocate nonstatic fields in gaps between previous fields") \ 1295 \ 1296 notproduct(bool, PrintFieldLayout, false, \ 1297 "Print field layout for each class") \ 1298 \ 1299 /* Need to limit the extent of the padding to reasonable size. */\ 1300 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1301 /* aggressive prefetching, while still leaving the room for segregating */\ 1302 /* among the distinct pages. */\ 1303 product(intx, ContendedPaddingWidth, 128, \ 1304 "How many bytes to pad the fields/classes marked @Contended with")\ 1305 range(0, 8192) \ 1306 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1307 \ 1308 product(bool, EnableContended, true, \ 1309 "Enable @Contended annotation support") \ 1310 \ 1311 product(bool, RestrictContended, true, \ 1312 "Restrict @Contended to trusted classes") \ 1313 \ 1314 product(bool, UseBiasedLocking, true, \ 1315 "Enable biased locking in JVM") \ 1316 \ 1317 product(intx, BiasedLockingStartupDelay, 0, \ 1318 "Number of milliseconds to wait before enabling biased locking") \ 1319 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1320 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1321 \ 1322 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1323 "Print statistics of biased locking in JVM") \ 1324 \ 1325 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1326 "Threshold of number of revocations per type to try to " \ 1327 "rebias all objects in the heap of that type") \ 1328 range(0, max_intx) \ 1329 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1330 \ 1331 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1332 "Threshold of number of revocations per type to permanently " \ 1333 "revoke biases of all objects in the heap of that type") \ 1334 range(0, max_intx) \ 1335 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1336 \ 1337 product(intx, BiasedLockingDecayTime, 25000, \ 1338 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1339 "type after previous bulk rebias") \ 1340 range(500, max_intx) \ 1341 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1342 \ 1343 product(bool, ExitOnOutOfMemoryError, false, \ 1344 "JVM exits on the first occurrence of an out-of-memory error") \ 1345 \ 1346 product(bool, CrashOnOutOfMemoryError, false, \ 1347 "JVM aborts, producing an error log and core/mini dump, on the " \ 1348 "first occurrence of an out-of-memory error") \ 1349 \ 1350 /* tracing */ \ 1351 \ 1352 develop(bool, StressRewriter, false, \ 1353 "Stress linktime bytecode rewriting") \ 1354 \ 1355 product(ccstr, TraceJVMTI, NULL, \ 1356 "Trace flags for JVMTI functions and events") \ 1357 \ 1358 /* This option can change an EMCP method into an obsolete method. */ \ 1359 /* This can affect tests that except specific methods to be EMCP. */ \ 1360 /* This option should be used with caution. */ \ 1361 product(bool, StressLdcRewrite, false, \ 1362 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1363 \ 1364 /* change to false by default sometime after Mustang */ \ 1365 product(bool, VerifyMergedCPBytecodes, true, \ 1366 "Verify bytecodes after RedefineClasses constant pool merging") \ 1367 \ 1368 develop(bool, TraceBytecodes, false, \ 1369 "Trace bytecode execution") \ 1370 \ 1371 develop(bool, TraceICs, false, \ 1372 "Trace inline cache changes") \ 1373 \ 1374 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1375 "Trace method invocation counter overflow") \ 1376 \ 1377 develop(bool, TraceInlineCacheClearing, false, \ 1378 "Trace clearing of inline caches in nmethods") \ 1379 \ 1380 develop(bool, TraceDependencies, false, \ 1381 "Trace dependencies") \ 1382 \ 1383 develop(bool, VerifyDependencies, trueInDebug, \ 1384 "Exercise and verify the compilation dependency mechanism") \ 1385 \ 1386 develop(bool, TraceNewOopMapGeneration, false, \ 1387 "Trace OopMapGeneration") \ 1388 \ 1389 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1390 "Trace OopMapGeneration: print detailed cell states") \ 1391 \ 1392 develop(bool, TimeOopMap, false, \ 1393 "Time calls to GenerateOopMap::compute_map() in sum") \ 1394 \ 1395 develop(bool, TimeOopMap2, false, \ 1396 "Time calls to GenerateOopMap::compute_map() individually") \ 1397 \ 1398 develop(bool, TraceOopMapRewrites, false, \ 1399 "Trace rewriting of method oops during oop map generation") \ 1400 \ 1401 develop(bool, TraceICBuffer, false, \ 1402 "Trace usage of IC buffer") \ 1403 \ 1404 develop(bool, TraceCompiledIC, false, \ 1405 "Trace changes of compiled IC") \ 1406 \ 1407 /* gc */ \ 1408 \ 1409 product(bool, UseSerialGC, false, \ 1410 "Use the Serial garbage collector") \ 1411 \ 1412 product(bool, UseG1GC, false, \ 1413 "Use the Garbage-First garbage collector") \ 1414 \ 1415 product(bool, UseParallelGC, false, \ 1416 "Use the Parallel Scavenge garbage collector") \ 1417 \ 1418 product(bool, UseParallelOldGC, false, \ 1419 "Use the Parallel Old garbage collector") \ 1420 \ 1421 product(uintx, HeapMaximumCompactionInterval, 20, \ 1422 "How often should we maximally compact the heap (not allowing " \ 1423 "any dead space)") \ 1424 range(0, max_uintx) \ 1425 \ 1426 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1427 "The collection count for the first maximum compaction") \ 1428 range(0, max_uintx) \ 1429 \ 1430 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1431 "Use maximum compaction in the Parallel Old garbage collector " \ 1432 "for a system GC") \ 1433 \ 1434 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1435 "The mean used by the parallel compact dead wood " \ 1436 "limiter (a number between 0-100)") \ 1437 range(0, 100) \ 1438 \ 1439 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1440 "The standard deviation used by the parallel compact dead wood " \ 1441 "limiter (a number between 0-100)") \ 1442 range(0, 100) \ 1443 \ 1444 product(uint, ParallelGCThreads, 0, \ 1445 "Number of parallel threads parallel gc will use") \ 1446 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1447 \ 1448 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1449 "Use semaphore synchronization for the GC Threads, " \ 1450 "instead of synchronization based on mutexes") \ 1451 \ 1452 product(bool, UseDynamicNumberOfGCThreads, false, \ 1453 "Dynamically choose the number of parallel threads " \ 1454 "parallel gc will use") \ 1455 \ 1456 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1457 "Inject thread creation failures for " \ 1458 "UseDynamicNumberOfGCThreads") \ 1459 \ 1460 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1461 "Force dynamic selection of the number of " \ 1462 "parallel threads parallel gc will use to aid debugging") \ 1463 \ 1464 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1465 "Size of heap (bytes) per GC thread used in calculating the " \ 1466 "number of GC threads") \ 1467 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1468 \ 1469 product(uint, ConcGCThreads, 0, \ 1470 "Number of threads concurrent gc will use") \ 1471 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1472 \ 1473 product(uint, GCTaskTimeStampEntries, 200, \ 1474 "Number of time stamp entries per gc worker thread") \ 1475 range(1, max_jint) \ 1476 \ 1477 product(bool, AlwaysTenure, false, \ 1478 "Always tenure objects in eden (ParallelGC only)") \ 1479 \ 1480 product(bool, NeverTenure, false, \ 1481 "Never tenure objects in eden, may tenure on overflow " \ 1482 "(ParallelGC only)") \ 1483 \ 1484 product(bool, ScavengeBeforeFullGC, true, \ 1485 "Scavenge youngest generation before each full GC.") \ 1486 \ 1487 product(bool, UseConcMarkSweepGC, false, \ 1488 "Use Concurrent Mark-Sweep GC in the old generation") \ 1489 \ 1490 product(bool, ExplicitGCInvokesConcurrent, false, \ 1491 "A System.gc() request invokes a concurrent collection; " \ 1492 "(effective only when using concurrent collectors)") \ 1493 \ 1494 product(bool, GCLockerInvokesConcurrent, false, \ 1495 "The exit of a JNI critical section necessitating a scavenge, " \ 1496 "also kicks off a background concurrent collection") \ 1497 \ 1498 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1499 "How much the GC can expand the eden by while the GC locker " \ 1500 "is active (as a percentage)") \ 1501 range(0, 100) \ 1502 \ 1503 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1504 "Number of times to retry allocations when " \ 1505 "blocked by the GC locker") \ 1506 range(0, max_uintx) \ 1507 \ 1508 product(bool, UseCMSBestFit, true, \ 1509 "Use CMS best fit allocation strategy") \ 1510 \ 1511 product(uintx, ParallelGCBufferWastePct, 10, \ 1512 "Wasted fraction of parallel allocation buffer") \ 1513 range(0, 100) \ 1514 \ 1515 product(uintx, TargetPLABWastePct, 10, \ 1516 "Target wasted space in last buffer as percent of overall " \ 1517 "allocation") \ 1518 range(1, 100) \ 1519 \ 1520 product(uintx, PLABWeight, 75, \ 1521 "Percentage (0-100) used to weight the current sample when " \ 1522 "computing exponentially decaying average for ResizePLAB") \ 1523 range(0, 100) \ 1524 \ 1525 product(bool, ResizePLAB, true, \ 1526 "Dynamically resize (survivor space) promotion LAB's") \ 1527 \ 1528 product(int, ParGCArrayScanChunk, 50, \ 1529 "Scan a subset of object array and push remainder, if array is " \ 1530 "bigger than this") \ 1531 range(1, max_jint/3) \ 1532 \ 1533 product(bool, ParGCUseLocalOverflow, false, \ 1534 "Instead of a global overflow list, use local overflow stacks") \ 1535 \ 1536 product(bool, ParGCTrimOverflow, true, \ 1537 "Eagerly trim the local overflow lists " \ 1538 "(when ParGCUseLocalOverflow)") \ 1539 \ 1540 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1541 "Simulate work queue overflow in ParNew") \ 1542 \ 1543 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1544 "An `interval' counter that determines how frequently " \ 1545 "we simulate overflow; a smaller number increases frequency") \ 1546 \ 1547 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1548 "The desired number of objects to claim from the overflow list") \ 1549 range(0, max_uintx) \ 1550 \ 1551 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1552 "The number of strides per worker thread that we divide up the " \ 1553 "card table scanning work into") \ 1554 range(1, max_uintx) \ 1555 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1556 \ 1557 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1558 "The number of cards in each chunk of the parallel chunks used " \ 1559 "during card table scanning") \ 1560 range(1, max_intx) \ 1561 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1562 \ 1563 product(uintx, OldPLABWeight, 50, \ 1564 "Percentage (0-100) used to weight the current sample when " \ 1565 "computing exponentially decaying average for resizing " \ 1566 "OldPLABSize") \ 1567 range(0, 100) \ 1568 \ 1569 product(bool, ResizeOldPLAB, true, \ 1570 "Dynamically resize (old gen) promotion LAB's") \ 1571 \ 1572 product(size_t, CMSOldPLABMax, 1024, \ 1573 "Maximum size of CMS gen promotion LAB caches per worker " \ 1574 "per block size") \ 1575 range(1, max_uintx) \ 1576 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1577 \ 1578 product(size_t, CMSOldPLABMin, 16, \ 1579 "Minimum size of CMS gen promotion LAB caches per worker " \ 1580 "per block size") \ 1581 range(1, max_uintx) \ 1582 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1583 \ 1584 product(uintx, CMSOldPLABNumRefills, 4, \ 1585 "Nominal number of refills of CMS gen promotion LAB cache " \ 1586 "per worker per block size") \ 1587 range(1, max_uintx) \ 1588 \ 1589 product(bool, CMSOldPLABResizeQuicker, false, \ 1590 "React on-the-fly during a scavenge to a sudden " \ 1591 "change in block demand rate") \ 1592 \ 1593 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1594 "The tolerance of the phase-change detector for on-the-fly " \ 1595 "PLAB resizing during a scavenge") \ 1596 range(1, max_uintx) \ 1597 \ 1598 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1599 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1600 "during a scavenge") \ 1601 range(1, max_uintx) \ 1602 \ 1603 product(bool, AlwaysPreTouch, false, \ 1604 "Force all freshly committed pages to be pre-touched") \ 1605 \ 1606 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1607 "Per-thread chunk size for parallel memory pre-touch.") \ 1608 range(1, SIZE_MAX / 2) \ 1609 \ 1610 product_pd(size_t, CMSYoungGenPerWorker, \ 1611 "The maximum size of young gen chosen by default per GC worker " \ 1612 "thread available") \ 1613 range(1, max_uintx) \ 1614 \ 1615 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1616 "Percentage (0-100) used to add conservatism when computing the " \ 1617 "duty cycle") \ 1618 range(0, 100) \ 1619 \ 1620 product(uintx, CMSExpAvgFactor, 50, \ 1621 "Percentage (0-100) used to weight the current sample when " \ 1622 "computing exponential averages for CMS statistics") \ 1623 range(0, 100) \ 1624 \ 1625 product(uintx, CMS_FLSWeight, 75, \ 1626 "Percentage (0-100) used to weight the current sample when " \ 1627 "computing exponentially decaying averages for CMS FLS " \ 1628 "statistics") \ 1629 range(0, 100) \ 1630 \ 1631 product(uintx, CMS_FLSPadding, 1, \ 1632 "The multiple of deviation from mean to use for buffering " \ 1633 "against volatility in free list demand") \ 1634 range(0, max_juint) \ 1635 \ 1636 product(uintx, FLSCoalescePolicy, 2, \ 1637 "CMS: aggressiveness level for coalescing, increasing " \ 1638 "from 0 to 4") \ 1639 range(0, 4) \ 1640 \ 1641 product(bool, FLSAlwaysCoalesceLarge, false, \ 1642 "CMS: larger free blocks are always available for coalescing") \ 1643 \ 1644 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1645 "CMS: the smaller the percentage the greater the coalescing " \ 1646 "force") \ 1647 range(0.0, 1.0) \ 1648 \ 1649 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1650 "CMS: the factor by which to inflate estimated demand of small " \ 1651 "block sizes to prevent coalescing with an adjoining block") \ 1652 range(0.0, DBL_MAX) \ 1653 \ 1654 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1655 "CMS: the factor by which to inflate estimated demand of large " \ 1656 "block sizes to prevent coalescing with an adjoining block") \ 1657 range(0.0, DBL_MAX) \ 1658 \ 1659 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1660 "CMS: the factor by which to inflate estimated demand of small " \ 1661 "block sizes to prevent splitting to supply demand for smaller " \ 1662 "blocks") \ 1663 range(0.0, DBL_MAX) \ 1664 \ 1665 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1666 "CMS: the factor by which to inflate estimated demand of large " \ 1667 "block sizes to prevent splitting to supply demand for smaller " \ 1668 "blocks") \ 1669 range(0.0, DBL_MAX) \ 1670 \ 1671 product(bool, CMSExtrapolateSweep, false, \ 1672 "CMS: cushion for block demand during sweep") \ 1673 \ 1674 product(uintx, CMS_SweepWeight, 75, \ 1675 "Percentage (0-100) used to weight the current sample when " \ 1676 "computing exponentially decaying average for inter-sweep " \ 1677 "duration") \ 1678 range(0, 100) \ 1679 \ 1680 product(uintx, CMS_SweepPadding, 1, \ 1681 "The multiple of deviation from mean to use for buffering " \ 1682 "against volatility in inter-sweep duration") \ 1683 range(0, max_juint) \ 1684 \ 1685 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1686 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1687 "duration exceeds this threshold in milliseconds") \ 1688 range(0, max_uintx) \ 1689 \ 1690 product(bool, CMSClassUnloadingEnabled, true, \ 1691 "Whether class unloading enabled when using CMS GC") \ 1692 \ 1693 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1694 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1695 "count for which classes may not be unloaded") \ 1696 range(0, max_uintx) \ 1697 \ 1698 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1699 "Replenish an indexed free list with this number of chunks") \ 1700 range(1, max_uintx) \ 1701 \ 1702 product(bool, CMSReplenishIntermediate, true, \ 1703 "Replenish all intermediate free-list caches") \ 1704 \ 1705 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1706 "When satisfying batched demand, split blocks from the " \ 1707 "IndexedFreeList whose size is a multiple of requested size") \ 1708 \ 1709 product(bool, CMSLoopWarn, false, \ 1710 "Warn in case of excessive CMS looping") \ 1711 \ 1712 /* where does the range max value of (max_jint - 1) come from? */ \ 1713 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1714 "Maximum size of marking stack") \ 1715 range(1, (max_jint - 1)) \ 1716 \ 1717 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1718 "Size of marking stack") \ 1719 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1720 \ 1721 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1722 "Simulate frequent marking stack / work queue overflow") \ 1723 \ 1724 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1725 "An \"interval\" counter that determines how frequently " \ 1726 "to simulate overflow; a smaller number increases frequency") \ 1727 \ 1728 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1729 "Maximum number of abortable preclean iterations, if > 0") \ 1730 range(0, max_uintx) \ 1731 \ 1732 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1733 "Maximum time in abortable preclean (in milliseconds)") \ 1734 range(0, max_intx) \ 1735 \ 1736 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1737 "Nominal minimum work per abortable preclean iteration") \ 1738 range(0, max_uintx) \ 1739 \ 1740 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1741 "Time that we sleep between iterations when not given " \ 1742 "enough work per iteration") \ 1743 range(0, max_intx) \ 1744 \ 1745 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1746 product(size_t, CMSRescanMultiple, 32, \ 1747 "Size (in cards) of CMS parallel rescan task") \ 1748 range(1, SIZE_MAX / 4096) \ 1749 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1750 \ 1751 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1752 product(size_t, CMSConcMarkMultiple, 32, \ 1753 "Size (in cards) of CMS concurrent MT marking task") \ 1754 range(1, SIZE_MAX / 4096) \ 1755 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1756 \ 1757 product(bool, CMSAbortSemantics, false, \ 1758 "Whether abort-on-overflow semantics is implemented") \ 1759 \ 1760 product(bool, CMSParallelInitialMarkEnabled, true, \ 1761 "Use the parallel initial mark.") \ 1762 \ 1763 product(bool, CMSParallelRemarkEnabled, true, \ 1764 "Whether parallel remark enabled (only if ParNewGC)") \ 1765 \ 1766 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1767 "Whether parallel remark of survivor space " \ 1768 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1769 \ 1770 product(bool, CMSPLABRecordAlways, true, \ 1771 "Always record survivor space PLAB boundaries (effective only " \ 1772 "if CMSParallelSurvivorRemarkEnabled)") \ 1773 \ 1774 product(bool, CMSEdenChunksRecordAlways, true, \ 1775 "Always record eden chunks used for the parallel initial mark " \ 1776 "or remark of eden") \ 1777 \ 1778 product(bool, CMSConcurrentMTEnabled, true, \ 1779 "Whether multi-threaded concurrent work enabled " \ 1780 "(effective only if ParNewGC)") \ 1781 \ 1782 product(bool, CMSPrecleaningEnabled, true, \ 1783 "Whether concurrent precleaning enabled") \ 1784 \ 1785 product(uintx, CMSPrecleanIter, 3, \ 1786 "Maximum number of precleaning iteration passes") \ 1787 range(0, 9) \ 1788 \ 1789 product(uintx, CMSPrecleanDenominator, 3, \ 1790 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1791 "ratio") \ 1792 range(1, max_uintx) \ 1793 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1794 \ 1795 product(uintx, CMSPrecleanNumerator, 2, \ 1796 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1797 "ratio") \ 1798 range(0, max_uintx-1) \ 1799 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1800 \ 1801 product(bool, CMSPrecleanRefLists1, true, \ 1802 "Preclean ref lists during (initial) preclean phase") \ 1803 \ 1804 product(bool, CMSPrecleanRefLists2, false, \ 1805 "Preclean ref lists during abortable preclean phase") \ 1806 \ 1807 product(bool, CMSPrecleanSurvivors1, false, \ 1808 "Preclean survivors during (initial) preclean phase") \ 1809 \ 1810 product(bool, CMSPrecleanSurvivors2, true, \ 1811 "Preclean survivors during abortable preclean phase") \ 1812 \ 1813 product(uintx, CMSPrecleanThreshold, 1000, \ 1814 "Do not iterate again if number of dirty cards is less than this")\ 1815 range(100, max_uintx) \ 1816 \ 1817 product(bool, CMSCleanOnEnter, true, \ 1818 "Clean-on-enter optimization for reducing number of dirty cards") \ 1819 \ 1820 product(uintx, CMSRemarkVerifyVariant, 1, \ 1821 "Choose variant (1,2) of verification following remark") \ 1822 range(1, 2) \ 1823 \ 1824 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1825 "If Eden size is below this, do not try to schedule remark") \ 1826 range(0, max_uintx) \ 1827 \ 1828 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1829 "The Eden occupancy percentage (0-100) at which " \ 1830 "to try and schedule remark pause") \ 1831 range(0, 100) \ 1832 \ 1833 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1834 "Start sampling eden top at least before young gen " \ 1835 "occupancy reaches 1/<ratio> of the size at which " \ 1836 "we plan to schedule remark") \ 1837 range(1, max_uintx) \ 1838 \ 1839 product(uintx, CMSSamplingGrain, 16*K, \ 1840 "The minimum distance between eden samples for CMS (see above)") \ 1841 range(ObjectAlignmentInBytes, max_uintx) \ 1842 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1843 \ 1844 product(bool, CMSScavengeBeforeRemark, false, \ 1845 "Attempt scavenge before the CMS remark step") \ 1846 \ 1847 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1848 "Don't drain below this size per parallel worker/thief") \ 1849 range(1, max_juint) \ 1850 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1851 \ 1852 manageable(intx, CMSWaitDuration, 2000, \ 1853 "Time in milliseconds that CMS thread waits for young GC") \ 1854 range(min_jint, max_jint) \ 1855 \ 1856 develop(uintx, CMSCheckInterval, 1000, \ 1857 "Interval in milliseconds that CMS thread checks if it " \ 1858 "should start a collection cycle") \ 1859 \ 1860 product(bool, CMSYield, true, \ 1861 "Yield between steps of CMS") \ 1862 \ 1863 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1864 "Bitmap operations should process at most this many bits " \ 1865 "between yields") \ 1866 range(1, max_uintx) \ 1867 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1868 \ 1869 product(bool, CMSPrintChunksInDump, false, \ 1870 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1871 "trace level include more detailed information about the" \ 1872 "free chunks") \ 1873 \ 1874 product(bool, CMSPrintObjectsInDump, false, \ 1875 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1876 "trace level include more detailed information about the" \ 1877 "allocated objects") \ 1878 \ 1879 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1880 "Verify that all references across the FLS boundary " \ 1881 "are to valid objects") \ 1882 \ 1883 diagnostic(bool, FLSVerifyLists, false, \ 1884 "Do lots of (expensive) FreeListSpace verification") \ 1885 \ 1886 diagnostic(bool, FLSVerifyIndexTable, false, \ 1887 "Do lots of (expensive) FLS index table verification") \ 1888 \ 1889 develop(bool, FLSVerifyDictionary, false, \ 1890 "Do lots of (expensive) FLS dictionary verification") \ 1891 \ 1892 develop(bool, VerifyBlockOffsetArray, false, \ 1893 "Do (expensive) block offset array verification") \ 1894 \ 1895 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1896 "Maintain _unallocated_block in BlockOffsetArray " \ 1897 "(currently applicable only to CMS collector)") \ 1898 \ 1899 product(intx, RefDiscoveryPolicy, 0, \ 1900 "Select type of reference discovery policy: " \ 1901 "reference-based(0) or referent-based(1)") \ 1902 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1903 ReferenceProcessor::DiscoveryPolicyMax) \ 1904 \ 1905 product(bool, ParallelRefProcEnabled, false, \ 1906 "Enable parallel reference processing whenever possible") \ 1907 \ 1908 product(bool, ParallelRefProcBalancingEnabled, true, \ 1909 "Enable balancing of reference processing queues") \ 1910 \ 1911 product(uintx, CMSTriggerRatio, 80, \ 1912 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1913 "allocated before a CMS collection cycle commences") \ 1914 range(0, 100) \ 1915 \ 1916 product(uintx, CMSBootstrapOccupancy, 50, \ 1917 "Percentage CMS generation occupancy at which to " \ 1918 "initiate CMS collection for bootstrapping collection stats") \ 1919 range(0, 100) \ 1920 \ 1921 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1922 "Percentage CMS generation occupancy to start a CMS collection " \ 1923 "cycle. A negative value means that CMSTriggerRatio is used") \ 1924 range(min_intx, 100) \ 1925 \ 1926 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1927 "The percent occupancy (IHOP) of the current old generation " \ 1928 "capacity above which a concurrent mark cycle will be initiated " \ 1929 "Its value may change over time if adaptive IHOP is enabled, " \ 1930 "otherwise the value remains constant. " \ 1931 "In the latter case a value of 0 will result as frequent as " \ 1932 "possible concurrent marking cycles. A value of 100 disables " \ 1933 "concurrent marking. " \ 1934 "Fragmentation waste in the old generation is not considered " \ 1935 "free space in this calculation. (G1 collector only)") \ 1936 range(0, 100) \ 1937 \ 1938 manageable(intx, CMSTriggerInterval, -1, \ 1939 "Commence a CMS collection cycle (at least) every so many " \ 1940 "milliseconds (0 permanently, -1 disabled)") \ 1941 range(-1, max_intx) \ 1942 \ 1943 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1944 "Only use occupancy as a criterion for starting a CMS collection")\ 1945 \ 1946 product(uintx, CMSIsTooFullPercentage, 98, \ 1947 "An absolute ceiling above which CMS will always consider the " \ 1948 "unloading of classes when class unloading is enabled") \ 1949 range(0, 100) \ 1950 \ 1951 develop(bool, CMSTestInFreeList, false, \ 1952 "Check if the coalesced range is already in the " \ 1953 "free lists as claimed") \ 1954 \ 1955 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1956 "Check that all the garbage collected was returned to the " \ 1957 "free lists") \ 1958 \ 1959 notproduct(bool, ScavengeALot, false, \ 1960 "Force scavenge at every Nth exit from the runtime system " \ 1961 "(N=ScavengeALotInterval)") \ 1962 \ 1963 develop(bool, FullGCALot, false, \ 1964 "Force full gc at every Nth exit from the runtime system " \ 1965 "(N=FullGCALotInterval)") \ 1966 \ 1967 notproduct(bool, GCALotAtAllSafepoints, false, \ 1968 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1969 \ 1970 notproduct(bool, PromotionFailureALot, false, \ 1971 "Use promotion failure handling on every youngest generation " \ 1972 "collection") \ 1973 \ 1974 develop(uintx, PromotionFailureALotCount, 1000, \ 1975 "Number of promotion failures occurring at PLAB " \ 1976 "refill attempts (ParNew) or promotion attempts " \ 1977 "(other young collectors)") \ 1978 \ 1979 develop(uintx, PromotionFailureALotInterval, 5, \ 1980 "Total collections between promotion failures a lot") \ 1981 \ 1982 experimental(uintx, WorkStealingSleepMillis, 1, \ 1983 "Sleep time when sleep is used for yields") \ 1984 \ 1985 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1986 "Number of yields before a sleep is done during work stealing") \ 1987 \ 1988 experimental(uintx, WorkStealingHardSpins, 4096, \ 1989 "Number of iterations in a spin loop between checks on " \ 1990 "time out of hard spin") \ 1991 \ 1992 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1993 "Ratio of hard spins to calls to yield") \ 1994 \ 1995 develop(uintx, ObjArrayMarkingStride, 2048, \ 1996 "Number of object array elements to push onto the marking stack " \ 1997 "before pushing a continuation entry") \ 1998 \ 1999 develop(bool, MetadataAllocationFailALot, false, \ 2000 "Fail metadata allocations at intervals controlled by " \ 2001 "MetadataAllocationFailALotInterval") \ 2002 \ 2003 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2004 "Metadata allocation failure a lot interval") \ 2005 \ 2006 notproduct(bool, ExecuteInternalVMTests, false, \ 2007 "Enable execution of internal VM tests") \ 2008 \ 2009 notproduct(bool, VerboseInternalVMTests, false, \ 2010 "Turn on logging for internal VM tests.") \ 2011 \ 2012 product(bool, ExecutingUnitTests, false, \ 2013 "Whether the JVM is running unit tests or not") \ 2014 \ 2015 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2016 \ 2017 product_pd(bool, ResizeTLAB, \ 2018 "Dynamically resize TLAB size for threads") \ 2019 \ 2020 product(bool, ZeroTLAB, false, \ 2021 "Zero out the newly created TLAB") \ 2022 \ 2023 product(bool, FastTLABRefill, false, \ 2024 "(Deprecated) Use fast TLAB refill code") \ 2025 \ 2026 product(bool, TLABStats, true, \ 2027 "Provide more detailed and expensive TLAB statistics.") \ 2028 \ 2029 product_pd(bool, NeverActAsServerClassMachine, \ 2030 "Never act like a server-class machine") \ 2031 \ 2032 product(bool, AlwaysActAsServerClassMachine, false, \ 2033 "Always act like a server-class machine") \ 2034 \ 2035 product_pd(uint64_t, MaxRAM, \ 2036 "Real memory size (in bytes) used to set maximum heap size") \ 2037 range(0, 0XFFFFFFFFFFFFFFFF) \ 2038 \ 2039 product(bool, AggressiveHeap, false, \ 2040 "Optimize heap options for long-running memory intensive apps") \ 2041 \ 2042 product(size_t, ErgoHeapSizeLimit, 0, \ 2043 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2044 "MaxRAM * MaxRAMPercentage / 100") \ 2045 range(0, max_uintx) \ 2046 \ 2047 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2048 "Use CGroup memory limit as physical memory limit for heap " \ 2049 "sizing" \ 2050 "Deprecated, replaced by container support") \ 2051 \ 2052 product(uintx, MaxRAMFraction, 4, \ 2053 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2054 "size. " \ 2055 "Deprecated, use MaxRAMPercentage instead") \ 2056 range(1, max_uintx) \ 2057 \ 2058 product(uintx, MinRAMFraction, 2, \ 2059 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2060 "size on systems with small physical memory size. " \ 2061 "Deprecated, use MinRAMPercentage instead") \ 2062 range(1, max_uintx) \ 2063 \ 2064 product(uintx, InitialRAMFraction, 64, \ 2065 "Fraction (1/n) of real memory used for initial heap size. " \ 2066 "Deprecated, use InitialRAMPercentage instead") \ 2067 range(1, max_uintx) \ 2068 \ 2069 product(double, MaxRAMPercentage, 25.0, \ 2070 "Maximum percentage of real memory used for maximum heap size") \ 2071 range(0.0, 100.0) \ 2072 \ 2073 product(double, MinRAMPercentage, 50.0, \ 2074 "Minimum percentage of real memory used for maximum heap" \ 2075 "size on systems with small physical memory size") \ 2076 range(0.0, 100.0) \ 2077 \ 2078 product(double, InitialRAMPercentage, 1.5625, \ 2079 "Percentage of real memory used for initial heap size") \ 2080 range(0.0, 100.0) \ 2081 \ 2082 product(int, ActiveProcessorCount, -1, \ 2083 "Specify the CPU count the VM should use and report as active") \ 2084 \ 2085 develop(uintx, MaxVirtMemFraction, 2, \ 2086 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2087 "determining maximum heap size") \ 2088 \ 2089 product(bool, UseAdaptiveSizePolicy, true, \ 2090 "Use adaptive generation sizing policies") \ 2091 \ 2092 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2093 "Use adaptive survivor sizing policies") \ 2094 \ 2095 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2096 "Use adaptive young-old sizing policies at minor collections") \ 2097 \ 2098 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2099 "Use adaptive young-old sizing policies at major collections") \ 2100 \ 2101 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2102 "Include statistics from System.gc() for adaptive size policy") \ 2103 \ 2104 product(bool, UseAdaptiveGCBoundary, false, \ 2105 "Allow young-old boundary to move") \ 2106 \ 2107 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2108 "Resize the virtual spaces of the young or old generations") \ 2109 range(-1, 1) \ 2110 \ 2111 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2112 "Policy for changing generation size for throughput goals") \ 2113 range(0, 1) \ 2114 \ 2115 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2116 "Number of steps where heuristics is used before data is used") \ 2117 range(0, max_uintx) \ 2118 \ 2119 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2120 "Number of collections before the adaptive sizing is started") \ 2121 \ 2122 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2123 "Collection interval for printing information; zero means never") \ 2124 range(0, max_uintx) \ 2125 \ 2126 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2127 "Use adaptive minimum footprint as a goal") \ 2128 \ 2129 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2130 "Weight given to exponential resizing, between 0 and 100") \ 2131 range(0, 100) \ 2132 \ 2133 product(uintx, AdaptiveTimeWeight, 25, \ 2134 "Weight given to time in adaptive policy, between 0 and 100") \ 2135 range(0, 100) \ 2136 \ 2137 product(uintx, PausePadding, 1, \ 2138 "How much buffer to keep for pause time") \ 2139 range(0, max_juint) \ 2140 \ 2141 product(uintx, PromotedPadding, 3, \ 2142 "How much buffer to keep for promotion failure") \ 2143 range(0, max_juint) \ 2144 \ 2145 product(uintx, SurvivorPadding, 3, \ 2146 "How much buffer to keep for survivor overflow") \ 2147 range(0, max_juint) \ 2148 \ 2149 product(uintx, ThresholdTolerance, 10, \ 2150 "Allowed collection cost difference between generations") \ 2151 range(0, 100) \ 2152 \ 2153 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2154 "If collection costs are within margin, reduce both by full " \ 2155 "delta") \ 2156 range(0, 100) \ 2157 \ 2158 product(uintx, YoungGenerationSizeIncrement, 20, \ 2159 "Adaptive size percentage change in young generation") \ 2160 range(0, 100) \ 2161 \ 2162 product(uintx, YoungGenerationSizeSupplement, 80, \ 2163 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2164 range(0, 100) \ 2165 \ 2166 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2167 "Decay factor to YoungedGenerationSizeSupplement") \ 2168 range(1, max_uintx) \ 2169 \ 2170 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2171 "Adaptive size percentage change in tenured generation") \ 2172 range(0, 100) \ 2173 \ 2174 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2175 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2176 range(0, 100) \ 2177 \ 2178 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2179 "Decay factor to TenuredGenerationSizeIncrement") \ 2180 range(1, max_uintx) \ 2181 \ 2182 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2183 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2184 "or (G1 Only) the maximum GC time per MMU time slice") \ 2185 range(1, max_uintx - 1) \ 2186 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2187 \ 2188 product(uintx, GCPauseIntervalMillis, 0, \ 2189 "Time slice for MMU specification") \ 2190 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2191 \ 2192 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2193 "Adaptive size policy maximum GC minor pause time goal " \ 2194 "in millisecond") \ 2195 range(0, max_uintx) \ 2196 \ 2197 product(uintx, GCTimeRatio, 99, \ 2198 "Adaptive size policy application time to GC time ratio") \ 2199 range(0, max_juint) \ 2200 \ 2201 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2202 "Adaptive size scale down factor for shrinking") \ 2203 range(1, max_uintx) \ 2204 \ 2205 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2206 "Adaptive size decays the major cost for long major intervals") \ 2207 \ 2208 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2209 "Time scale over which major costs decay") \ 2210 range(0, max_uintx) \ 2211 \ 2212 product(uintx, MinSurvivorRatio, 3, \ 2213 "Minimum ratio of young generation/survivor space size") \ 2214 range(3, max_uintx) \ 2215 \ 2216 product(uintx, InitialSurvivorRatio, 8, \ 2217 "Initial ratio of young generation/survivor space size") \ 2218 range(0, max_uintx) \ 2219 \ 2220 product(size_t, BaseFootPrintEstimate, 256*M, \ 2221 "Estimate of footprint other than Java Heap") \ 2222 range(0, max_uintx) \ 2223 \ 2224 product(bool, UseGCOverheadLimit, true, \ 2225 "Use policy to limit of proportion of time spent in GC " \ 2226 "before an OutOfMemory error is thrown") \ 2227 \ 2228 product(uintx, GCTimeLimit, 98, \ 2229 "Limit of the proportion of time spent in GC before " \ 2230 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2231 range(0, 100) \ 2232 \ 2233 product(uintx, GCHeapFreeLimit, 2, \ 2234 "Minimum percentage of free space after a full GC before an " \ 2235 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2236 range(0, 100) \ 2237 \ 2238 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2239 "Number of consecutive collections before gc time limit fires") \ 2240 range(1, max_uintx) \ 2241 \ 2242 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2243 "How far ahead to prefetch destination area (<= 0 means off)") \ 2244 range(-1, max_jint) \ 2245 \ 2246 product(intx, PrefetchScanIntervalInBytes, -1, \ 2247 "How far ahead to prefetch scan area (<= 0 means off)") \ 2248 range(-1, max_jint) \ 2249 \ 2250 product(intx, PrefetchFieldsAhead, -1, \ 2251 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2252 range(-1, max_jint) \ 2253 \ 2254 diagnostic(bool, VerifyDuringStartup, false, \ 2255 "Verify memory system before executing any Java code " \ 2256 "during VM initialization") \ 2257 \ 2258 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2259 "Verify system before exiting") \ 2260 \ 2261 diagnostic(bool, VerifyBeforeGC, false, \ 2262 "Verify memory system before GC") \ 2263 \ 2264 diagnostic(bool, VerifyAfterGC, false, \ 2265 "Verify memory system after GC") \ 2266 \ 2267 diagnostic(bool, VerifyDuringGC, false, \ 2268 "Verify memory system during GC (between phases)") \ 2269 \ 2270 diagnostic(ccstrlist, VerifySubSet, "", \ 2271 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2272 "are enabled. One or more sub-systems can be specified " \ 2273 "in a comma separated string. Sub-systems are: " \ 2274 "threads, heap, symbol_table, string_table, codecache, " \ 2275 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2276 "codecache_oops") \ 2277 \ 2278 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2279 "Enable parallel memory system verification") \ 2280 \ 2281 diagnostic(bool, DeferInitialCardMark, false, \ 2282 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2283 "may arise from new_pre_store_barrier") \ 2284 \ 2285 product(bool, UseCondCardMark, false, \ 2286 "Check for already marked card before updating card table") \ 2287 \ 2288 diagnostic(bool, VerifyRememberedSets, false, \ 2289 "Verify GC remembered sets") \ 2290 \ 2291 diagnostic(bool, VerifyObjectStartArray, true, \ 2292 "Verify GC object start array if verify before/after") \ 2293 \ 2294 product(bool, DisableExplicitGC, false, \ 2295 "Ignore calls to System.gc()") \ 2296 \ 2297 notproduct(bool, CheckMemoryInitialization, false, \ 2298 "Check memory initialization") \ 2299 \ 2300 diagnostic(bool, BindCMSThreadToCPU, false, \ 2301 "Bind CMS Thread to CPU if possible") \ 2302 \ 2303 diagnostic(uintx, CPUForCMSThread, 0, \ 2304 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2305 range(0, max_juint) \ 2306 \ 2307 product(bool, BindGCTaskThreadsToCPUs, false, \ 2308 "Bind GCTaskThreads to CPUs if possible") \ 2309 \ 2310 product(bool, UseGCTaskAffinity, false, \ 2311 "Use worker affinity when asking for GCTasks") \ 2312 \ 2313 product(uintx, ProcessDistributionStride, 4, \ 2314 "Stride through processors when distributing processes") \ 2315 range(0, max_juint) \ 2316 \ 2317 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2318 "Number of times the coordinator GC thread will sleep while " \ 2319 "yielding before giving up and resuming GC") \ 2320 range(0, max_juint) \ 2321 \ 2322 product(uintx, CMSYieldSleepCount, 0, \ 2323 "Number of times a GC thread (minus the coordinator) " \ 2324 "will sleep while yielding before giving up and resuming GC") \ 2325 range(0, max_juint) \ 2326 \ 2327 product(bool, PrintGC, false, \ 2328 "Print message at garbage collection. " \ 2329 "Deprecated, use -Xlog:gc instead.") \ 2330 \ 2331 product(bool, PrintGCDetails, false, \ 2332 "Print more details at garbage collection. " \ 2333 "Deprecated, use -Xlog:gc* instead.") \ 2334 \ 2335 develop(intx, ConcGCYieldTimeout, 0, \ 2336 "If non-zero, assert that GC threads yield within this " \ 2337 "number of milliseconds") \ 2338 range(0, max_intx) \ 2339 \ 2340 develop(bool, TraceFinalizerRegistration, false, \ 2341 "Trace registration of final references") \ 2342 \ 2343 notproduct(bool, TraceScavenge, false, \ 2344 "Trace scavenge") \ 2345 \ 2346 product(bool, IgnoreEmptyClassPaths, false, \ 2347 "Ignore empty path elements in -classpath") \ 2348 \ 2349 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2350 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2351 "Initial size of the boot class loader data metaspace") \ 2352 range(30*K, max_uintx/BytesPerWord) \ 2353 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2354 \ 2355 product(bool, PrintHeapAtSIGBREAK, true, \ 2356 "Print heap layout in response to SIGBREAK") \ 2357 \ 2358 manageable(bool, PrintClassHistogram, false, \ 2359 "Print a histogram of class instances") \ 2360 \ 2361 develop(bool, TraceGCTaskManager, false, \ 2362 "Trace actions of the GC task manager") \ 2363 \ 2364 develop(bool, TraceGCTaskQueue, false, \ 2365 "Trace actions of the GC task queues") \ 2366 \ 2367 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2368 "Trace marking phase in ParallelOldGC") \ 2369 \ 2370 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2371 "Trace dense prefix computation for ParallelOldGC") \ 2372 \ 2373 develop(bool, IgnoreLibthreadGPFault, false, \ 2374 "Suppress workaround for libthread GP fault") \ 2375 \ 2376 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2377 "The percentage of the used heap that the instances of a class " \ 2378 "must occupy for the class to generate a trace event") \ 2379 range(0.0, 100.0) \ 2380 \ 2381 /* JVMTI heap profiling */ \ 2382 \ 2383 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2384 "Trace JVMTI object tagging calls") \ 2385 \ 2386 diagnostic(bool, VerifyBeforeIteration, false, \ 2387 "Verify memory system before JVMTI iteration") \ 2388 \ 2389 /* compiler interface */ \ 2390 \ 2391 develop(bool, CIPrintCompilerName, false, \ 2392 "when CIPrint is active, print the name of the active compiler") \ 2393 \ 2394 diagnostic(bool, CIPrintCompileQueue, false, \ 2395 "display the contents of the compile queue whenever a " \ 2396 "compilation is enqueued") \ 2397 \ 2398 develop(bool, CIPrintRequests, false, \ 2399 "display every request for compilation") \ 2400 \ 2401 product(bool, CITime, false, \ 2402 "collect timing information for compilation") \ 2403 \ 2404 develop(bool, CITimeVerbose, false, \ 2405 "be more verbose in compilation timings") \ 2406 \ 2407 develop(bool, CITimeEach, false, \ 2408 "display timing information after each successful compilation") \ 2409 \ 2410 develop(bool, CICountOSR, false, \ 2411 "use a separate counter when assigning ids to osr compilations") \ 2412 \ 2413 develop(bool, CICompileNatives, true, \ 2414 "compile native methods if supported by the compiler") \ 2415 \ 2416 develop_pd(bool, CICompileOSR, \ 2417 "compile on stack replacement methods if supported by the " \ 2418 "compiler") \ 2419 \ 2420 develop(bool, CIPrintMethodCodes, false, \ 2421 "print method bytecodes of the compiled code") \ 2422 \ 2423 develop(bool, CIPrintTypeFlow, false, \ 2424 "print the results of ciTypeFlow analysis") \ 2425 \ 2426 develop(bool, CITraceTypeFlow, false, \ 2427 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2428 \ 2429 develop(intx, OSROnlyBCI, -1, \ 2430 "OSR only at this bci. Negative values mean exclude that bci") \ 2431 \ 2432 /* compiler */ \ 2433 \ 2434 /* notice: the max range value here is max_jint, not max_intx */ \ 2435 /* because of overflow issue */ \ 2436 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2437 "Number of compiler threads to run") \ 2438 range(0, max_jint) \ 2439 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2440 \ 2441 product(intx, CompilationPolicyChoice, 0, \ 2442 "which compilation policy (0-3)") \ 2443 range(0, 3) \ 2444 \ 2445 develop(bool, UseStackBanging, true, \ 2446 "use stack banging for stack overflow checks (required for " \ 2447 "proper StackOverflow handling; disable only to measure cost " \ 2448 "of stackbanging)") \ 2449 \ 2450 develop(bool, UseStrictFP, true, \ 2451 "use strict fp if modifier strictfp is set") \ 2452 \ 2453 develop(bool, GenerateSynchronizationCode, true, \ 2454 "generate locking/unlocking code for synchronized methods and " \ 2455 "monitors") \ 2456 \ 2457 develop(bool, GenerateRangeChecks, true, \ 2458 "Generate range checks for array accesses") \ 2459 \ 2460 diagnostic_pd(bool, ImplicitNullChecks, \ 2461 "Generate code for implicit null checks") \ 2462 \ 2463 product_pd(bool, TrapBasedNullChecks, \ 2464 "Generate code for null checks that uses a cmp and trap " \ 2465 "instruction raising SIGTRAP. This is only used if an access to" \ 2466 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2467 "ImplicitNullChecks don't work (PPC64).") \ 2468 \ 2469 product(bool, PrintSafepointStatistics, false, \ 2470 "Print statistics about safepoint synchronization") \ 2471 \ 2472 product(intx, PrintSafepointStatisticsCount, 300, \ 2473 "Total number of safepoint statistics collected " \ 2474 "before printing them out") \ 2475 range(1, max_intx) \ 2476 \ 2477 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2478 "Print safepoint statistics only when safepoint takes " \ 2479 "more than PrintSafepointSatisticsTimeout in millis") \ 2480 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2481 NOT_LP64(range(-1, max_intx)) \ 2482 \ 2483 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 2484 "Enable Thread SMR extra validity checks") \ 2485 \ 2486 diagnostic(bool, EnableThreadSMRStatistics, true, \ 2487 "Enable Thread SMR Statistics") \ 2488 \ 2489 product(bool, Inline, true, \ 2490 "Enable inlining") \ 2491 \ 2492 product(bool, ClipInlining, true, \ 2493 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2494 \ 2495 develop(bool, UseCHA, true, \ 2496 "Enable CHA") \ 2497 \ 2498 product(bool, UseTypeProfile, true, \ 2499 "Check interpreter profile for historically monomorphic calls") \ 2500 \ 2501 diagnostic(bool, PrintInlining, false, \ 2502 "Print inlining optimizations") \ 2503 \ 2504 product(bool, UsePopCountInstruction, false, \ 2505 "Use population count instruction") \ 2506 \ 2507 develop(bool, EagerInitialization, false, \ 2508 "Eagerly initialize classes if possible") \ 2509 \ 2510 diagnostic(bool, LogTouchedMethods, false, \ 2511 "Log methods which have been ever touched in runtime") \ 2512 \ 2513 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2514 "Print all methods that have been ever touched in runtime") \ 2515 \ 2516 develop(bool, TraceMethodReplacement, false, \ 2517 "Print when methods are replaced do to recompilation") \ 2518 \ 2519 develop(bool, PrintMethodFlushing, false, \ 2520 "Print the nmethods being flushed") \ 2521 \ 2522 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2523 "print statistics about method flushing") \ 2524 \ 2525 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2526 "Number of compiled code invocations after which " \ 2527 "the method is considered as hot by the flusher") \ 2528 range(1, max_jint) \ 2529 \ 2530 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2531 "Minimum number of sweeper passes before an nmethod " \ 2532 "can be flushed") \ 2533 range(0, max_intx) \ 2534 \ 2535 product(bool, UseCodeAging, true, \ 2536 "Insert counter to detect warm methods") \ 2537 \ 2538 diagnostic(bool, StressCodeAging, false, \ 2539 "Start with counters compiled in") \ 2540 \ 2541 develop(bool, StressCodeBuffers, false, \ 2542 "Exercise code buffer expansion and other rare state changes") \ 2543 \ 2544 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2545 "Generate extra debugging information for non-safepoints in " \ 2546 "nmethods") \ 2547 \ 2548 product(bool, PrintVMOptions, false, \ 2549 "Print flags that appeared on the command line") \ 2550 \ 2551 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2552 "Ignore unrecognized VM options") \ 2553 \ 2554 product(bool, PrintCommandLineFlags, false, \ 2555 "Print flags specified on command line or set by ergonomics") \ 2556 \ 2557 product(bool, PrintFlagsInitial, false, \ 2558 "Print all VM flags before argument processing and exit VM") \ 2559 \ 2560 product(bool, PrintFlagsFinal, false, \ 2561 "Print all VM flags after argument and ergonomic processing") \ 2562 \ 2563 notproduct(bool, PrintFlagsWithComments, false, \ 2564 "Print all VM flags with default values and descriptions and " \ 2565 "exit") \ 2566 \ 2567 product(bool, PrintFlagsRanges, false, \ 2568 "Print VM flags and their ranges and exit VM") \ 2569 \ 2570 diagnostic(bool, SerializeVMOutput, true, \ 2571 "Use a mutex to serialize output to tty and LogFile") \ 2572 \ 2573 diagnostic(bool, DisplayVMOutput, true, \ 2574 "Display all VM output on the tty, independently of LogVMOutput") \ 2575 \ 2576 diagnostic(bool, LogVMOutput, false, \ 2577 "Save VM output to LogFile") \ 2578 \ 2579 diagnostic(ccstr, LogFile, NULL, \ 2580 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2581 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2582 \ 2583 product(ccstr, ErrorFile, NULL, \ 2584 "If an error occurs, save the error data to this file " \ 2585 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2586 \ 2587 product(bool, DisplayVMOutputToStderr, false, \ 2588 "If DisplayVMOutput is true, display all VM output to stderr") \ 2589 \ 2590 product(bool, DisplayVMOutputToStdout, false, \ 2591 "If DisplayVMOutput is true, display all VM output to stdout") \ 2592 \ 2593 product(bool, UseHeavyMonitors, false, \ 2594 "use heavyweight instead of lightweight Java monitors") \ 2595 \ 2596 product(bool, PrintStringTableStatistics, false, \ 2597 "print statistics about the StringTable and SymbolTable") \ 2598 \ 2599 diagnostic(bool, VerifyStringTableAtExit, false, \ 2600 "verify StringTable contents at exit") \ 2601 \ 2602 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2603 "print histogram of the symbol table") \ 2604 \ 2605 notproduct(bool, ExitVMOnVerifyError, false, \ 2606 "standard exit from VM if bytecode verify error " \ 2607 "(only in debug mode)") \ 2608 \ 2609 diagnostic(ccstr, AbortVMOnException, NULL, \ 2610 "Call fatal if this exception is thrown. Example: " \ 2611 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2612 \ 2613 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2614 "Call fatal if the exception pointed by AbortVMOnException " \ 2615 "has this message") \ 2616 \ 2617 develop(bool, DebugVtables, false, \ 2618 "add debugging code to vtable dispatch") \ 2619 \ 2620 notproduct(bool, PrintVtableStats, false, \ 2621 "print vtables stats at end of run") \ 2622 \ 2623 develop(bool, TraceCreateZombies, false, \ 2624 "trace creation of zombie nmethods") \ 2625 \ 2626 notproduct(bool, IgnoreLockingAssertions, false, \ 2627 "disable locking assertions (for speed)") \ 2628 \ 2629 product(bool, RangeCheckElimination, true, \ 2630 "Eliminate range checks") \ 2631 \ 2632 develop_pd(bool, UncommonNullCast, \ 2633 "track occurrences of null in casts; adjust compiler tactics") \ 2634 \ 2635 develop(bool, TypeProfileCasts, true, \ 2636 "treat casts like calls for purposes of type profiling") \ 2637 \ 2638 develop(bool, DelayCompilationDuringStartup, true, \ 2639 "Delay invoking the compiler until main application class is " \ 2640 "loaded") \ 2641 \ 2642 develop(bool, CompileTheWorld, false, \ 2643 "Compile all methods in all classes in bootstrap class path " \ 2644 "(stress test)") \ 2645 \ 2646 develop(bool, CompileTheWorldPreloadClasses, true, \ 2647 "Preload all classes used by a class before start loading") \ 2648 \ 2649 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2650 "Force a safepoint every n compiles so sweeper can keep up") \ 2651 \ 2652 develop(bool, FillDelaySlots, true, \ 2653 "Fill delay slots (on SPARC only)") \ 2654 \ 2655 develop(bool, TimeLivenessAnalysis, false, \ 2656 "Time computation of bytecode liveness analysis") \ 2657 \ 2658 develop(bool, TraceLivenessGen, false, \ 2659 "Trace the generation of liveness analysis information") \ 2660 \ 2661 notproduct(bool, TraceLivenessQuery, false, \ 2662 "Trace queries of liveness analysis information") \ 2663 \ 2664 notproduct(bool, CollectIndexSetStatistics, false, \ 2665 "Collect information about IndexSets") \ 2666 \ 2667 develop(bool, UseLoopSafepoints, true, \ 2668 "Generate Safepoint nodes in every loop") \ 2669 \ 2670 develop(intx, FastAllocateSizeLimit, 128*K, \ 2671 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2672 "Inline allocations larger than this in doublewords must go slow")\ 2673 \ 2674 product(bool, AggressiveOpts, false, \ 2675 "Enable aggressive optimizations - see arguments.cpp") \ 2676 \ 2677 product_pd(bool, CompactStrings, \ 2678 "Enable Strings to use single byte chars in backing store") \ 2679 \ 2680 product_pd(uintx, TypeProfileLevel, \ 2681 "=XYZ, with Z: Type profiling of arguments at call; " \ 2682 "Y: Type profiling of return value at call; " \ 2683 "X: Type profiling of parameters to methods; " \ 2684 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2685 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2686 \ 2687 product(intx, TypeProfileArgsLimit, 2, \ 2688 "max number of call arguments to consider for type profiling") \ 2689 range(0, 16) \ 2690 \ 2691 product(intx, TypeProfileParmsLimit, 2, \ 2692 "max number of incoming parameters to consider for type profiling"\ 2693 ", -1 for all") \ 2694 range(-1, 64) \ 2695 \ 2696 /* statistics */ \ 2697 develop(bool, CountCompiledCalls, false, \ 2698 "Count method invocations") \ 2699 \ 2700 notproduct(bool, CountRuntimeCalls, false, \ 2701 "Count VM runtime calls") \ 2702 \ 2703 develop(bool, CountJNICalls, false, \ 2704 "Count jni method invocations") \ 2705 \ 2706 notproduct(bool, CountJVMCalls, false, \ 2707 "Count jvm method invocations") \ 2708 \ 2709 notproduct(bool, CountRemovableExceptions, false, \ 2710 "Count exceptions that could be replaced by branches due to " \ 2711 "inlining") \ 2712 \ 2713 notproduct(bool, ICMissHistogram, false, \ 2714 "Produce histogram of IC misses") \ 2715 \ 2716 /* interpreter */ \ 2717 product_pd(bool, RewriteBytecodes, \ 2718 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2719 \ 2720 product_pd(bool, RewriteFrequentPairs, \ 2721 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2722 \ 2723 diagnostic(bool, PrintInterpreter, false, \ 2724 "Print the generated interpreter code") \ 2725 \ 2726 product(bool, UseInterpreter, true, \ 2727 "Use interpreter for non-compiled methods") \ 2728 \ 2729 develop(bool, UseFastSignatureHandlers, true, \ 2730 "Use fast signature handlers for native calls") \ 2731 \ 2732 product(bool, UseLoopCounter, true, \ 2733 "Increment invocation counter on backward branch") \ 2734 \ 2735 product_pd(bool, UseOnStackReplacement, \ 2736 "Use on stack replacement, calls runtime if invoc. counter " \ 2737 "overflows in loop") \ 2738 \ 2739 notproduct(bool, TraceOnStackReplacement, false, \ 2740 "Trace on stack replacement") \ 2741 \ 2742 product_pd(bool, PreferInterpreterNativeStubs, \ 2743 "Use always interpreter stubs for native methods invoked via " \ 2744 "interpreter") \ 2745 \ 2746 develop(bool, CountBytecodes, false, \ 2747 "Count number of bytecodes executed") \ 2748 \ 2749 develop(bool, PrintBytecodeHistogram, false, \ 2750 "Print histogram of the executed bytecodes") \ 2751 \ 2752 develop(bool, PrintBytecodePairHistogram, false, \ 2753 "Print histogram of the executed bytecode pairs") \ 2754 \ 2755 diagnostic(bool, PrintSignatureHandlers, false, \ 2756 "Print code generated for native method signature handlers") \ 2757 \ 2758 develop(bool, VerifyOops, false, \ 2759 "Do plausibility checks for oops") \ 2760 \ 2761 develop(bool, CheckUnhandledOops, false, \ 2762 "Check for unhandled oops in VM code") \ 2763 \ 2764 develop(bool, VerifyJNIFields, trueInDebug, \ 2765 "Verify jfieldIDs for instance fields") \ 2766 \ 2767 notproduct(bool, VerifyJNIEnvThread, false, \ 2768 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2769 "from JNI") \ 2770 \ 2771 develop(bool, VerifyFPU, false, \ 2772 "Verify FPU state (check for NaN's, etc.)") \ 2773 \ 2774 develop(bool, VerifyThread, false, \ 2775 "Watch the thread register for corruption (SPARC only)") \ 2776 \ 2777 develop(bool, VerifyActivationFrameSize, false, \ 2778 "Verify that activation frame didn't become smaller than its " \ 2779 "minimal size") \ 2780 \ 2781 develop(bool, TraceFrequencyInlining, false, \ 2782 "Trace frequency based inlining") \ 2783 \ 2784 develop_pd(bool, InlineIntrinsics, \ 2785 "Inline intrinsics that can be statically resolved") \ 2786 \ 2787 product_pd(bool, ProfileInterpreter, \ 2788 "Profile at the bytecode level during interpretation") \ 2789 \ 2790 develop(bool, TraceProfileInterpreter, false, \ 2791 "Trace profiling at the bytecode level during interpretation. " \ 2792 "This outputs the profiling information collected to improve " \ 2793 "jit compilation.") \ 2794 \ 2795 develop_pd(bool, ProfileTraps, \ 2796 "Profile deoptimization traps at the bytecode level") \ 2797 \ 2798 product(intx, ProfileMaturityPercentage, 20, \ 2799 "number of method invocations/branches (expressed as % of " \ 2800 "CompileThreshold) before using the method's profile") \ 2801 range(0, 100) \ 2802 \ 2803 diagnostic(bool, PrintMethodData, false, \ 2804 "Print the results of +ProfileInterpreter at end of run") \ 2805 \ 2806 develop(bool, VerifyDataPointer, trueInDebug, \ 2807 "Verify the method data pointer during interpreter profiling") \ 2808 \ 2809 develop(bool, VerifyCompiledCode, false, \ 2810 "Include miscellaneous runtime verifications in nmethod code; " \ 2811 "default off because it disturbs nmethod size heuristics") \ 2812 \ 2813 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2814 "Manually make GC thread crash then dump java stack trace; " \ 2815 "Test only") \ 2816 \ 2817 /* compilation */ \ 2818 product(bool, UseCompiler, true, \ 2819 "Use Just-In-Time compilation") \ 2820 \ 2821 develop(bool, TraceCompilationPolicy, false, \ 2822 "Trace compilation policy") \ 2823 \ 2824 develop(bool, TimeCompilationPolicy, false, \ 2825 "Time the compilation policy") \ 2826 \ 2827 product(bool, UseCounterDecay, true, \ 2828 "Adjust recompilation counters") \ 2829 \ 2830 develop(intx, CounterHalfLifeTime, 30, \ 2831 "Half-life time of invocation counters (in seconds)") \ 2832 \ 2833 develop(intx, CounterDecayMinIntervalLength, 500, \ 2834 "The minimum interval (in milliseconds) between invocation of " \ 2835 "CounterDecay") \ 2836 \ 2837 product(bool, AlwaysCompileLoopMethods, false, \ 2838 "When using recompilation, never interpret methods " \ 2839 "containing loops") \ 2840 \ 2841 product(bool, DontCompileHugeMethods, true, \ 2842 "Do not compile methods > HugeMethodLimit") \ 2843 \ 2844 /* Bytecode escape analysis estimation. */ \ 2845 product(bool, EstimateArgEscape, true, \ 2846 "Analyze bytecodes to estimate escape state of arguments") \ 2847 \ 2848 product(intx, BCEATraceLevel, 0, \ 2849 "How much tracing to do of bytecode escape analysis estimates " \ 2850 "(0-3)") \ 2851 range(0, 3) \ 2852 \ 2853 product(intx, MaxBCEAEstimateLevel, 5, \ 2854 "Maximum number of nested calls that are analyzed by BC EA") \ 2855 range(0, max_jint) \ 2856 \ 2857 product(intx, MaxBCEAEstimateSize, 150, \ 2858 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2859 range(0, max_jint) \ 2860 \ 2861 product(intx, AllocatePrefetchStyle, 1, \ 2862 "0 = no prefetch, " \ 2863 "1 = generate prefetch instructions for each allocation, " \ 2864 "2 = use TLAB watermark to gate allocation prefetch, " \ 2865 "3 = generate one prefetch instruction per cache line") \ 2866 range(0, 3) \ 2867 \ 2868 product(intx, AllocatePrefetchDistance, -1, \ 2869 "Distance to prefetch ahead of allocation pointer. " \ 2870 "-1: use system-specific value (automatically determined") \ 2871 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2872 \ 2873 product(intx, AllocatePrefetchLines, 3, \ 2874 "Number of lines to prefetch ahead of array allocation pointer") \ 2875 range(1, 64) \ 2876 \ 2877 product(intx, AllocateInstancePrefetchLines, 1, \ 2878 "Number of lines to prefetch ahead of instance allocation " \ 2879 "pointer") \ 2880 range(1, 64) \ 2881 \ 2882 product(intx, AllocatePrefetchStepSize, 16, \ 2883 "Step size in bytes of sequential prefetch instructions") \ 2884 range(1, 512) \ 2885 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2886 \ 2887 product(intx, AllocatePrefetchInstr, 0, \ 2888 "Select instruction to prefetch ahead of allocation pointer") \ 2889 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2890 \ 2891 /* deoptimization */ \ 2892 develop(bool, TraceDeoptimization, false, \ 2893 "Trace deoptimization") \ 2894 \ 2895 develop(bool, PrintDeoptimizationDetails, false, \ 2896 "Print more information about deoptimization") \ 2897 \ 2898 develop(bool, DebugDeoptimization, false, \ 2899 "Tracing various information while debugging deoptimization") \ 2900 \ 2901 product(intx, SelfDestructTimer, 0, \ 2902 "Will cause VM to terminate after a given time (in minutes) " \ 2903 "(0 means off)") \ 2904 range(0, max_intx) \ 2905 \ 2906 product(intx, MaxJavaStackTraceDepth, 1024, \ 2907 "The maximum number of lines in the stack trace for Java " \ 2908 "exceptions (0 means all)") \ 2909 range(0, max_jint/2) \ 2910 \ 2911 /* notice: the max range value here is max_jint, not max_intx */ \ 2912 /* because of overflow issue */ \ 2913 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2914 "Guarantee a safepoint (at least) every so many milliseconds " \ 2915 "(0 means none)") \ 2916 range(0, max_jint) \ 2917 \ 2918 product(intx, SafepointTimeoutDelay, 10000, \ 2919 "Delay in milliseconds for option SafepointTimeout") \ 2920 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2921 NOT_LP64(range(0, max_intx)) \ 2922 \ 2923 product(intx, NmethodSweepActivity, 10, \ 2924 "Removes cold nmethods from code cache if > 0. Higher values " \ 2925 "result in more aggressive sweeping") \ 2926 range(0, 2000) \ 2927 \ 2928 notproduct(bool, LogSweeper, false, \ 2929 "Keep a ring buffer of sweeper activity") \ 2930 \ 2931 notproduct(intx, SweeperLogEntries, 1024, \ 2932 "Number of records in the ring buffer of sweeper activity") \ 2933 \ 2934 notproduct(intx, MemProfilingInterval, 500, \ 2935 "Time between each invocation of the MemProfiler") \ 2936 \ 2937 develop(intx, MallocCatchPtr, -1, \ 2938 "Hit breakpoint when mallocing/freeing this pointer") \ 2939 \ 2940 notproduct(ccstrlist, SuppressErrorAt, "", \ 2941 "List of assertions (file:line) to muzzle") \ 2942 \ 2943 develop(intx, StackPrintLimit, 100, \ 2944 "number of stack frames to print in VM-level stack dump") \ 2945 \ 2946 notproduct(intx, MaxElementPrintSize, 256, \ 2947 "maximum number of elements to print") \ 2948 \ 2949 notproduct(intx, MaxSubklassPrintSize, 4, \ 2950 "maximum number of subklasses to print when printing klass") \ 2951 \ 2952 product(intx, MaxInlineLevel, 9, \ 2953 "maximum number of nested calls that are inlined") \ 2954 range(0, max_jint) \ 2955 \ 2956 product(intx, MaxRecursiveInlineLevel, 1, \ 2957 "maximum number of nested recursive calls that are inlined") \ 2958 range(0, max_jint) \ 2959 \ 2960 develop(intx, MaxForceInlineLevel, 100, \ 2961 "maximum number of nested calls that are forced for inlining " \ 2962 "(using CompileCommand or marked w/ @ForceInline)") \ 2963 range(0, max_jint) \ 2964 \ 2965 product_pd(intx, InlineSmallCode, \ 2966 "Only inline already compiled methods if their code size is " \ 2967 "less than this") \ 2968 range(0, max_jint) \ 2969 \ 2970 product(intx, MaxInlineSize, 35, \ 2971 "The maximum bytecode size of a method to be inlined") \ 2972 range(0, max_jint) \ 2973 \ 2974 product_pd(intx, FreqInlineSize, \ 2975 "The maximum bytecode size of a frequent method to be inlined") \ 2976 range(0, max_jint) \ 2977 \ 2978 product(intx, MaxTrivialSize, 6, \ 2979 "The maximum bytecode size of a trivial method to be inlined") \ 2980 range(0, max_jint) \ 2981 \ 2982 product(intx, MinInliningThreshold, 250, \ 2983 "The minimum invocation count a method needs to have to be " \ 2984 "inlined") \ 2985 range(0, max_jint) \ 2986 \ 2987 develop(intx, MethodHistogramCutoff, 100, \ 2988 "The cutoff value for method invocation histogram (+CountCalls)") \ 2989 \ 2990 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2991 "Number of interpreted methods to show in profile") \ 2992 \ 2993 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2994 "Number of compiled methods to show in profile") \ 2995 \ 2996 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2997 "Number of stub methods to show in profile") \ 2998 \ 2999 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3000 "Number of runtime stub nodes to show in profile") \ 3001 \ 3002 product(intx, ProfileIntervalsTicks, 100, \ 3003 "Number of ticks between printing of interval profile " \ 3004 "(+ProfileIntervals)") \ 3005 range(0, max_intx) \ 3006 \ 3007 notproduct(intx, ScavengeALotInterval, 1, \ 3008 "Interval between which scavenge will occur with +ScavengeALot") \ 3009 \ 3010 notproduct(intx, FullGCALotInterval, 1, \ 3011 "Interval between which full gc will occur with +FullGCALot") \ 3012 \ 3013 notproduct(intx, FullGCALotStart, 0, \ 3014 "For which invocation to start FullGCAlot") \ 3015 \ 3016 notproduct(intx, FullGCALotDummies, 32*K, \ 3017 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3018 "to move") \ 3019 \ 3020 develop(intx, DontYieldALotInterval, 10, \ 3021 "Interval between which yields will be dropped (milliseconds)") \ 3022 \ 3023 develop(intx, ProfilerPCTickThreshold, 15, \ 3024 "Number of ticks in a PC buckets to be a hotspot") \ 3025 \ 3026 notproduct(intx, DeoptimizeALotInterval, 5, \ 3027 "Number of exits until DeoptimizeALot kicks in") \ 3028 \ 3029 notproduct(intx, ZombieALotInterval, 5, \ 3030 "Number of exits until ZombieALot kicks in") \ 3031 \ 3032 diagnostic(uintx, MallocMaxTestWords, 0, \ 3033 "If non-zero, maximum number of words that malloc/realloc can " \ 3034 "allocate (for testing only)") \ 3035 range(0, max_uintx) \ 3036 \ 3037 product(intx, TypeProfileWidth, 2, \ 3038 "Number of receiver types to record in call/cast profile") \ 3039 range(0, 8) \ 3040 \ 3041 develop(intx, BciProfileWidth, 2, \ 3042 "Number of return bci's to record in ret profile") \ 3043 \ 3044 product(intx, PerMethodRecompilationCutoff, 400, \ 3045 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3046 range(-1, max_intx) \ 3047 \ 3048 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3049 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3050 range(-1, max_intx) \ 3051 \ 3052 product(intx, PerMethodTrapLimit, 100, \ 3053 "Limit on traps (of one kind) in a method (includes inlines)") \ 3054 range(0, max_jint) \ 3055 \ 3056 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3057 "Limit on speculative traps (of one kind) in a method " \ 3058 "(includes inlines)") \ 3059 range(0, max_jint) \ 3060 \ 3061 product(intx, PerBytecodeTrapLimit, 4, \ 3062 "Limit on traps (of one kind) at a particular BCI") \ 3063 range(0, max_jint) \ 3064 \ 3065 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3066 "Extra method data trap entries for speculation") \ 3067 \ 3068 develop(intx, InlineFrequencyRatio, 20, \ 3069 "Ratio of call site execution to caller method invocation") \ 3070 range(0, max_jint) \ 3071 \ 3072 diagnostic_pd(intx, InlineFrequencyCount, \ 3073 "Count of call site execution necessary to trigger frequent " \ 3074 "inlining") \ 3075 range(0, max_jint) \ 3076 \ 3077 develop(intx, InlineThrowCount, 50, \ 3078 "Force inlining of interpreted methods that throw this often") \ 3079 range(0, max_jint) \ 3080 \ 3081 develop(intx, InlineThrowMaxSize, 200, \ 3082 "Force inlining of throwing methods smaller than this") \ 3083 range(0, max_jint) \ 3084 \ 3085 develop(intx, ProfilerNodeSize, 1024, \ 3086 "Size in K to allocate for the Profile Nodes of each thread") \ 3087 range(0, 1024) \ 3088 \ 3089 /* gc parameters */ \ 3090 product(size_t, InitialHeapSize, 0, \ 3091 "Initial heap size (in bytes); zero means use ergonomics") \ 3092 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3093 \ 3094 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3095 "Maximum heap size (in bytes)") \ 3096 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3097 \ 3098 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3099 "Initial tenured generation size (in bytes)") \ 3100 range(0, max_uintx) \ 3101 \ 3102 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3103 "Initial new generation size (in bytes)") \ 3104 constraint(NewSizeConstraintFunc,AfterErgo) \ 3105 \ 3106 product(size_t, MaxNewSize, max_uintx, \ 3107 "Maximum new generation size (in bytes), max_uintx means set " \ 3108 "ergonomically") \ 3109 range(0, max_uintx) \ 3110 \ 3111 product_pd(size_t, HeapBaseMinAddress, \ 3112 "OS specific low limit for heap base address") \ 3113 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3114 \ 3115 product(size_t, PretenureSizeThreshold, 0, \ 3116 "Maximum size in bytes of objects allocated in DefNew " \ 3117 "generation; zero means no maximum") \ 3118 range(0, max_uintx) \ 3119 \ 3120 product(size_t, MinTLABSize, 2*K, \ 3121 "Minimum allowed TLAB size (in bytes)") \ 3122 range(1, max_uintx/2) \ 3123 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3124 \ 3125 product(size_t, TLABSize, 0, \ 3126 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3127 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3128 \ 3129 product(size_t, YoungPLABSize, 4096, \ 3130 "Size of young gen promotion LAB's (in HeapWords)") \ 3131 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3132 \ 3133 product(size_t, OldPLABSize, 1024, \ 3134 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3135 "of blocks to attempt to claim when refilling CMS LAB's") \ 3136 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3137 \ 3138 product(uintx, TLABAllocationWeight, 35, \ 3139 "Allocation averaging weight") \ 3140 range(0, 100) \ 3141 \ 3142 /* Limit the lower bound of this flag to 1 as it is used */ \ 3143 /* in a division expression. */ \ 3144 product(uintx, TLABWasteTargetPercent, 1, \ 3145 "Percentage of Eden that can be wasted") \ 3146 range(1, 100) \ 3147 \ 3148 product(uintx, TLABRefillWasteFraction, 64, \ 3149 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3150 range(1, max_juint) \ 3151 \ 3152 product(uintx, TLABWasteIncrement, 4, \ 3153 "Increment allowed waste at slow allocation") \ 3154 range(0, max_jint) \ 3155 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3156 \ 3157 product(uintx, SurvivorRatio, 8, \ 3158 "Ratio of eden/survivor space size") \ 3159 range(1, max_uintx-2) \ 3160 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3161 \ 3162 product(uintx, NewRatio, 2, \ 3163 "Ratio of old/new generation sizes") \ 3164 range(0, max_uintx-1) \ 3165 \ 3166 product_pd(size_t, NewSizeThreadIncrease, \ 3167 "Additional size added to desired new generation size per " \ 3168 "non-daemon thread (in bytes)") \ 3169 range(0, max_uintx) \ 3170 \ 3171 product_pd(size_t, MetaspaceSize, \ 3172 "Initial threshold (in bytes) at which a garbage collection " \ 3173 "is done to reduce Metaspace usage") \ 3174 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3175 \ 3176 product(size_t, MaxMetaspaceSize, max_uintx, \ 3177 "Maximum size of Metaspaces (in bytes)") \ 3178 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3179 \ 3180 product(size_t, CompressedClassSpaceSize, 1*G, \ 3181 "Maximum size of class area in Metaspace when compressed " \ 3182 "class pointers are used") \ 3183 range(1*M, 3*G) \ 3184 \ 3185 manageable(uintx, MinHeapFreeRatio, 40, \ 3186 "The minimum percentage of heap free after GC to avoid expansion."\ 3187 " For most GCs this applies to the old generation. In G1 and" \ 3188 " ParallelGC it applies to the whole heap.") \ 3189 range(0, 100) \ 3190 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3191 \ 3192 manageable(uintx, MaxHeapFreeRatio, 70, \ 3193 "The maximum percentage of heap free after GC to avoid shrinking."\ 3194 " For most GCs this applies to the old generation. In G1 and" \ 3195 " ParallelGC it applies to the whole heap.") \ 3196 range(0, 100) \ 3197 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3198 \ 3199 product(bool, ShrinkHeapInSteps, true, \ 3200 "When disabled, informs the GC to shrink the java heap directly" \ 3201 " to the target size at the next full GC rather than requiring" \ 3202 " smaller steps during multiple full GCs.") \ 3203 \ 3204 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3205 "Number of milliseconds per MB of free space in the heap") \ 3206 range(0, max_intx) \ 3207 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3208 \ 3209 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3210 "The minimum change in heap space due to GC (in bytes)") \ 3211 range(0, max_uintx) \ 3212 \ 3213 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3214 "The minimum expansion of Metaspace (in bytes)") \ 3215 range(0, max_uintx) \ 3216 \ 3217 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3218 "The maximum percentage of Metaspace free after GC to avoid " \ 3219 "shrinking") \ 3220 range(0, 100) \ 3221 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3222 \ 3223 product(uintx, MinMetaspaceFreeRatio, 40, \ 3224 "The minimum percentage of Metaspace free after GC to avoid " \ 3225 "expansion") \ 3226 range(0, 99) \ 3227 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3228 \ 3229 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3230 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3231 range(0, max_uintx) \ 3232 \ 3233 product(uintx, QueuedAllocationWarningCount, 0, \ 3234 "Number of times an allocation that queues behind a GC " \ 3235 "will retry before printing a warning") \ 3236 range(0, max_uintx) \ 3237 \ 3238 diagnostic(uintx, VerifyGCStartAt, 0, \ 3239 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3240 range(0, max_uintx) \ 3241 \ 3242 diagnostic(intx, VerifyGCLevel, 0, \ 3243 "Generation level at which to start +VerifyBefore/AfterGC") \ 3244 range(0, 1) \ 3245 \ 3246 product(uintx, MaxTenuringThreshold, 15, \ 3247 "Maximum value for tenuring threshold") \ 3248 range(0, markOopDesc::max_age + 1) \ 3249 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3250 \ 3251 product(uintx, InitialTenuringThreshold, 7, \ 3252 "Initial value for tenuring threshold") \ 3253 range(0, markOopDesc::max_age + 1) \ 3254 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3255 \ 3256 product(uintx, TargetSurvivorRatio, 50, \ 3257 "Desired percentage of survivor space used after scavenge") \ 3258 range(0, 100) \ 3259 \ 3260 product(uintx, MarkSweepDeadRatio, 5, \ 3261 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3262 "Serial mark sweep treats this as both the minimum and maximum " \ 3263 "value. " \ 3264 "CMS uses this value only if it falls back to mark sweep. " \ 3265 "Par compact uses a variable scale based on the density of the " \ 3266 "generation and treats this as the maximum value when the heap " \ 3267 "is either completely full or completely empty. Par compact " \ 3268 "also has a smaller default value; see arguments.cpp.") \ 3269 range(0, 100) \ 3270 \ 3271 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3272 "How often should we fully compact the heap (ignoring the dead " \ 3273 "space parameters)") \ 3274 range(1, max_juint) \ 3275 \ 3276 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3277 "Delay between expansion and allocation (in milliseconds)") \ 3278 \ 3279 develop(uintx, GCWorkerDelayMillis, 0, \ 3280 "Delay in scheduling GC workers (in milliseconds)") \ 3281 \ 3282 product(intx, DeferThrSuspendLoopCount, 4000, \ 3283 "(Unstable) Number of times to iterate in safepoint loop " \ 3284 "before blocking VM threads ") \ 3285 range(-1, max_jint-1) \ 3286 \ 3287 product(intx, DeferPollingPageLoopCount, -1, \ 3288 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3289 "before changing safepoint polling page to RO ") \ 3290 range(-1, max_jint-1) \ 3291 \ 3292 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3293 range(0, max_intx) \ 3294 \ 3295 product(bool, PSChunkLargeArrays, true, \ 3296 "Process large arrays in chunks") \ 3297 \ 3298 product(uintx, GCDrainStackTargetSize, 64, \ 3299 "Number of entries we will try to leave on the stack " \ 3300 "during parallel gc") \ 3301 range(0, max_juint) \ 3302 \ 3303 /* stack parameters */ \ 3304 product_pd(intx, StackYellowPages, \ 3305 "Number of yellow zone (recoverable overflows) pages of size " \ 3306 "4KB. If pages are bigger yellow zone is aligned up.") \ 3307 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3308 \ 3309 product_pd(intx, StackRedPages, \ 3310 "Number of red zone (unrecoverable overflows) pages of size " \ 3311 "4KB. If pages are bigger red zone is aligned up.") \ 3312 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3313 \ 3314 product_pd(intx, StackReservedPages, \ 3315 "Number of reserved zone (reserved to annotated methods) pages" \ 3316 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3317 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3318 \ 3319 product(bool, RestrictReservedStack, true, \ 3320 "Restrict @ReservedStackAccess to trusted classes") \ 3321 \ 3322 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3323 product_pd(intx, StackShadowPages, \ 3324 "Number of shadow zone (for overflow checking) pages of size " \ 3325 "4KB. If pages are bigger shadow zone is aligned up. " \ 3326 "This should exceed the depth of the VM and native call stack.") \ 3327 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3328 \ 3329 product_pd(intx, ThreadStackSize, \ 3330 "Thread Stack Size (in Kbytes)") \ 3331 range(0, 1 * M) \ 3332 \ 3333 product_pd(intx, VMThreadStackSize, \ 3334 "Non-Java Thread Stack Size (in Kbytes)") \ 3335 range(0, max_intx/(1 * K)) \ 3336 \ 3337 product_pd(intx, CompilerThreadStackSize, \ 3338 "Compiler Thread Stack Size (in Kbytes)") \ 3339 range(0, max_intx/(1 * K)) \ 3340 \ 3341 develop_pd(size_t, JVMInvokeMethodSlack, \ 3342 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3343 \ 3344 /* code cache parameters */ \ 3345 develop_pd(uintx, CodeCacheSegmentSize, \ 3346 "Code cache segment size (in bytes) - smallest unit of " \ 3347 "allocation") \ 3348 range(1, 1024) \ 3349 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3350 \ 3351 develop_pd(intx, CodeEntryAlignment, \ 3352 "Code entry alignment for generated code (in bytes)") \ 3353 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3354 \ 3355 product_pd(intx, OptoLoopAlignment, \ 3356 "Align inner loops to zero relative to this modulus") \ 3357 range(1, 16) \ 3358 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3359 \ 3360 product_pd(uintx, InitialCodeCacheSize, \ 3361 "Initial code cache size (in bytes)") \ 3362 range(0, max_uintx) \ 3363 \ 3364 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3365 "Minimum code cache size (in bytes) required to start VM.") \ 3366 range(0, max_uintx) \ 3367 \ 3368 product(bool, SegmentedCodeCache, false, \ 3369 "Use a segmented code cache") \ 3370 \ 3371 product_pd(uintx, ReservedCodeCacheSize, \ 3372 "Reserved code cache size (in bytes) - maximum code cache size") \ 3373 range(0, max_uintx) \ 3374 \ 3375 product_pd(uintx, NonProfiledCodeHeapSize, \ 3376 "Size of code heap with non-profiled methods (in bytes)") \ 3377 range(0, max_uintx) \ 3378 \ 3379 product_pd(uintx, ProfiledCodeHeapSize, \ 3380 "Size of code heap with profiled methods (in bytes)") \ 3381 range(0, max_uintx) \ 3382 \ 3383 product_pd(uintx, NonNMethodCodeHeapSize, \ 3384 "Size of code heap with non-nmethods (in bytes)") \ 3385 range(0, max_uintx) \ 3386 \ 3387 product_pd(uintx, CodeCacheExpansionSize, \ 3388 "Code cache expansion size (in bytes)") \ 3389 range(0, max_uintx) \ 3390 \ 3391 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 3392 "Minimum number of segments in a code cache block") \ 3393 range(1, 100) \ 3394 \ 3395 notproduct(bool, ExitOnFullCodeCache, false, \ 3396 "Exit the VM if we fill the code cache") \ 3397 \ 3398 product(bool, UseCodeCacheFlushing, true, \ 3399 "Remove cold/old nmethods from the code cache") \ 3400 \ 3401 product(uintx, StartAggressiveSweepingAt, 10, \ 3402 "Start aggressive sweeping if X[%] of the code cache is free." \ 3403 "Segmented code cache: X[%] of the non-profiled heap." \ 3404 "Non-segmented code cache: X[%] of the total code cache") \ 3405 range(0, 100) \ 3406 \ 3407 /* AOT parameters */ \ 3408 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3409 "Use AOT compiled files") \ 3410 \ 3411 product(ccstrlist, AOTLibrary, NULL, \ 3412 "AOT library") \ 3413 \ 3414 product(bool, PrintAOT, false, \ 3415 "Print used AOT klasses and methods") \ 3416 \ 3417 notproduct(bool, PrintAOTStatistics, false, \ 3418 "Print AOT statistics") \ 3419 \ 3420 diagnostic(bool, UseAOTStrictLoading, false, \ 3421 "Exit the VM if any of the AOT libraries has invalid config") \ 3422 \ 3423 product(bool, CalculateClassFingerprint, false, \ 3424 "Calculate class fingerprint") \ 3425 \ 3426 /* interpreter debugging */ \ 3427 develop(intx, BinarySwitchThreshold, 5, \ 3428 "Minimal number of lookupswitch entries for rewriting to binary " \ 3429 "switch") \ 3430 \ 3431 develop(intx, StopInterpreterAt, 0, \ 3432 "Stop interpreter execution at specified bytecode number") \ 3433 \ 3434 develop(intx, TraceBytecodesAt, 0, \ 3435 "Trace bytecodes starting with specified bytecode number") \ 3436 \ 3437 /* compiler interface */ \ 3438 develop(intx, CIStart, 0, \ 3439 "The id of the first compilation to permit") \ 3440 \ 3441 develop(intx, CIStop, max_jint, \ 3442 "The id of the last compilation to permit") \ 3443 \ 3444 develop(intx, CIStartOSR, 0, \ 3445 "The id of the first osr compilation to permit " \ 3446 "(CICountOSR must be on)") \ 3447 \ 3448 develop(intx, CIStopOSR, max_jint, \ 3449 "The id of the last osr compilation to permit " \ 3450 "(CICountOSR must be on)") \ 3451 \ 3452 develop(intx, CIBreakAtOSR, -1, \ 3453 "The id of osr compilation to break at") \ 3454 \ 3455 develop(intx, CIBreakAt, -1, \ 3456 "The id of compilation to break at") \ 3457 \ 3458 product(ccstrlist, CompileOnly, "", \ 3459 "List of methods (pkg/class.name) to restrict compilation to") \ 3460 \ 3461 product(ccstr, CompileCommandFile, NULL, \ 3462 "Read compiler commands from this file [.hotspot_compiler]") \ 3463 \ 3464 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3465 "Read compiler directives from this file") \ 3466 \ 3467 product(ccstrlist, CompileCommand, "", \ 3468 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3469 \ 3470 develop(bool, ReplayCompiles, false, \ 3471 "Enable replay of compilations from ReplayDataFile") \ 3472 \ 3473 product(ccstr, ReplayDataFile, NULL, \ 3474 "File containing compilation replay information" \ 3475 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3476 \ 3477 product(ccstr, InlineDataFile, NULL, \ 3478 "File containing inlining replay information" \ 3479 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3480 \ 3481 develop(intx, ReplaySuppressInitializers, 2, \ 3482 "Control handling of class initialization during replay: " \ 3483 "0 - don't do anything special; " \ 3484 "1 - treat all class initializers as empty; " \ 3485 "2 - treat class initializers for application classes as empty; " \ 3486 "3 - allow all class initializers to run during bootstrap but " \ 3487 " pretend they are empty after starting replay") \ 3488 range(0, 3) \ 3489 \ 3490 develop(bool, ReplayIgnoreInitErrors, false, \ 3491 "Ignore exceptions thrown during initialization for replay") \ 3492 \ 3493 product(bool, DumpReplayDataOnError, true, \ 3494 "Record replay data for crashing compiler threads") \ 3495 \ 3496 product(bool, CICompilerCountPerCPU, false, \ 3497 "1 compiler thread for log(N CPUs)") \ 3498 \ 3499 develop(intx, CIFireOOMAt, -1, \ 3500 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3501 "(non-negative value throws OOM after this many CI accesses " \ 3502 "in each compile)") \ 3503 notproduct(intx, CICrashAt, -1, \ 3504 "id of compilation to trigger assert in compiler thread for " \ 3505 "the purpose of testing, e.g. generation of replay data") \ 3506 notproduct(bool, CIObjectFactoryVerify, false, \ 3507 "enable potentially expensive verification in ciObjectFactory") \ 3508 \ 3509 /* Priorities */ \ 3510 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3511 \ 3512 product(intx, ThreadPriorityPolicy, 0, \ 3513 "0 : Normal. "\ 3514 " VM chooses priorities that are appropriate for normal "\ 3515 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3516 " to normal native priority. Java priorities below " \ 3517 " NORM_PRIORITY map to lower native priority values. On "\ 3518 " Windows applications are allowed to use higher native "\ 3519 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3520 " not use the highest possible native priority, "\ 3521 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3522 " system threads. On Linux thread priorities are ignored "\ 3523 " because the OS does not support static priority in "\ 3524 " SCHED_OTHER scheduling class which is the only choice for "\ 3525 " non-root, non-realtime applications. "\ 3526 "1 : Aggressive. "\ 3527 " Java thread priorities map over to the entire range of "\ 3528 " native thread priorities. Higher Java thread priorities map "\ 3529 " to higher native thread priorities. This policy should be "\ 3530 " used with care, as sometimes it can cause performance "\ 3531 " degradation in the application and/or the entire system. On "\ 3532 " Linux this policy requires root privilege.") \ 3533 range(0, 1) \ 3534 \ 3535 product(bool, ThreadPriorityVerbose, false, \ 3536 "Print priority changes") \ 3537 \ 3538 product(intx, CompilerThreadPriority, -1, \ 3539 "The native priority at which compiler threads should run " \ 3540 "(-1 means no change)") \ 3541 range(min_jint, max_jint) \ 3542 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3543 \ 3544 product(intx, VMThreadPriority, -1, \ 3545 "The native priority at which the VM thread should run " \ 3546 "(-1 means no change)") \ 3547 range(-1, 127) \ 3548 \ 3549 product(bool, CompilerThreadHintNoPreempt, true, \ 3550 "(Solaris only) Give compiler threads an extra quanta") \ 3551 \ 3552 product(bool, VMThreadHintNoPreempt, false, \ 3553 "(Solaris only) Give VM thread an extra quanta") \ 3554 \ 3555 product(intx, JavaPriority1_To_OSPriority, -1, \ 3556 "Map Java priorities to OS priorities") \ 3557 range(-1, 127) \ 3558 \ 3559 product(intx, JavaPriority2_To_OSPriority, -1, \ 3560 "Map Java priorities to OS priorities") \ 3561 range(-1, 127) \ 3562 \ 3563 product(intx, JavaPriority3_To_OSPriority, -1, \ 3564 "Map Java priorities to OS priorities") \ 3565 range(-1, 127) \ 3566 \ 3567 product(intx, JavaPriority4_To_OSPriority, -1, \ 3568 "Map Java priorities to OS priorities") \ 3569 range(-1, 127) \ 3570 \ 3571 product(intx, JavaPriority5_To_OSPriority, -1, \ 3572 "Map Java priorities to OS priorities") \ 3573 range(-1, 127) \ 3574 \ 3575 product(intx, JavaPriority6_To_OSPriority, -1, \ 3576 "Map Java priorities to OS priorities") \ 3577 range(-1, 127) \ 3578 \ 3579 product(intx, JavaPriority7_To_OSPriority, -1, \ 3580 "Map Java priorities to OS priorities") \ 3581 range(-1, 127) \ 3582 \ 3583 product(intx, JavaPriority8_To_OSPriority, -1, \ 3584 "Map Java priorities to OS priorities") \ 3585 range(-1, 127) \ 3586 \ 3587 product(intx, JavaPriority9_To_OSPriority, -1, \ 3588 "Map Java priorities to OS priorities") \ 3589 range(-1, 127) \ 3590 \ 3591 product(intx, JavaPriority10_To_OSPriority,-1, \ 3592 "Map Java priorities to OS priorities") \ 3593 range(-1, 127) \ 3594 \ 3595 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3596 "Java thread priority 10 maps to critical scheduling priority") \ 3597 \ 3598 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3599 "Compiler thread(s) run at critical scheduling priority") \ 3600 \ 3601 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3602 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3603 \ 3604 /* compiler debugging */ \ 3605 notproduct(intx, CompileTheWorldStartAt, 1, \ 3606 "First class to consider when using +CompileTheWorld") \ 3607 \ 3608 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3609 "Last class to consider when using +CompileTheWorld") \ 3610 \ 3611 develop(intx, NewCodeParameter, 0, \ 3612 "Testing Only: Create a dedicated integer parameter before " \ 3613 "putback") \ 3614 \ 3615 /* new oopmap storage allocation */ \ 3616 develop(intx, MinOopMapAllocation, 8, \ 3617 "Minimum number of OopMap entries in an OopMapSet") \ 3618 \ 3619 /* Background Compilation */ \ 3620 develop(intx, LongCompileThreshold, 50, \ 3621 "Used with +TraceLongCompiles") \ 3622 \ 3623 /* recompilation */ \ 3624 product_pd(intx, CompileThreshold, \ 3625 "number of interpreted method invocations before (re-)compiling") \ 3626 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3627 \ 3628 product(double, CompileThresholdScaling, 1.0, \ 3629 "Factor to control when first compilation happens " \ 3630 "(both with and without tiered compilation): " \ 3631 "values greater than 1.0 delay counter overflow, " \ 3632 "values between 0 and 1.0 rush counter overflow, " \ 3633 "value of 1.0 leaves compilation thresholds unchanged " \ 3634 "value of 0.0 is equivalent to -Xint. " \ 3635 "" \ 3636 "Flag can be set as per-method option. " \ 3637 "If a value is specified for a method, compilation thresholds " \ 3638 "for that method are scaled by both the value of the global flag "\ 3639 "and the value of the per-method flag.") \ 3640 range(0.0, DBL_MAX) \ 3641 \ 3642 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3643 "Interpreter (tier 0) invocation notification frequency") \ 3644 range(0, 30) \ 3645 \ 3646 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3647 "C1 without MDO (tier 2) invocation notification frequency") \ 3648 range(0, 30) \ 3649 \ 3650 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3651 "C1 with MDO profiling (tier 3) invocation notification " \ 3652 "frequency") \ 3653 range(0, 30) \ 3654 \ 3655 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3656 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3657 range(0, 30) \ 3658 \ 3659 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3660 "Interpreter (tier 0) invocation notification frequency") \ 3661 range(0, 30) \ 3662 \ 3663 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3664 "C1 without MDO (tier 2) invocation notification frequency") \ 3665 range(0, 30) \ 3666 \ 3667 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3668 "C1 with MDO profiling (tier 3) invocation notification " \ 3669 "frequency") \ 3670 range(0, 30) \ 3671 \ 3672 product(intx, Tier2CompileThreshold, 0, \ 3673 "threshold at which tier 2 compilation is invoked") \ 3674 range(0, max_jint) \ 3675 \ 3676 product(intx, Tier2BackEdgeThreshold, 0, \ 3677 "Back edge threshold at which tier 2 compilation is invoked") \ 3678 range(0, max_jint) \ 3679 \ 3680 product(intx, Tier3InvocationThreshold, 200, \ 3681 "Compile if number of method invocations crosses this " \ 3682 "threshold") \ 3683 range(0, max_jint) \ 3684 \ 3685 product(intx, Tier3MinInvocationThreshold, 100, \ 3686 "Minimum invocation to compile at tier 3") \ 3687 range(0, max_jint) \ 3688 \ 3689 product(intx, Tier3CompileThreshold, 2000, \ 3690 "Threshold at which tier 3 compilation is invoked (invocation " \ 3691 "minimum must be satisfied)") \ 3692 range(0, max_jint) \ 3693 \ 3694 product(intx, Tier3BackEdgeThreshold, 60000, \ 3695 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3696 range(0, max_jint) \ 3697 \ 3698 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3699 "Compile if number of method invocations crosses this " \ 3700 "threshold if coming from AOT") \ 3701 range(0, max_jint) \ 3702 \ 3703 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3704 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3705 range(0, max_jint) \ 3706 \ 3707 product(intx, Tier3AOTCompileThreshold, 15000, \ 3708 "Threshold at which tier 3 compilation is invoked (invocation " \ 3709 "minimum must be satisfied) if coming from AOT") \ 3710 range(0, max_jint) \ 3711 \ 3712 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3713 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3714 "if coming from AOT") \ 3715 range(0, max_jint) \ 3716 \ 3717 product(intx, Tier4InvocationThreshold, 5000, \ 3718 "Compile if number of method invocations crosses this " \ 3719 "threshold") \ 3720 range(0, max_jint) \ 3721 \ 3722 product(intx, Tier4MinInvocationThreshold, 600, \ 3723 "Minimum invocation to compile at tier 4") \ 3724 range(0, max_jint) \ 3725 \ 3726 product(intx, Tier4CompileThreshold, 15000, \ 3727 "Threshold at which tier 4 compilation is invoked (invocation " \ 3728 "minimum must be satisfied") \ 3729 range(0, max_jint) \ 3730 \ 3731 product(intx, Tier4BackEdgeThreshold, 40000, \ 3732 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3733 range(0, max_jint) \ 3734 \ 3735 product(intx, Tier3DelayOn, 5, \ 3736 "If C2 queue size grows over this amount per compiler thread " \ 3737 "stop compiling at tier 3 and start compiling at tier 2") \ 3738 range(0, max_jint) \ 3739 \ 3740 product(intx, Tier3DelayOff, 2, \ 3741 "If C2 queue size is less than this amount per compiler thread " \ 3742 "allow methods compiled at tier 2 transition to tier 3") \ 3743 range(0, max_jint) \ 3744 \ 3745 product(intx, Tier3LoadFeedback, 5, \ 3746 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3747 "reaches this amount per compiler thread") \ 3748 range(0, max_jint) \ 3749 \ 3750 product(intx, Tier4LoadFeedback, 3, \ 3751 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3752 "reaches this amount per compiler thread") \ 3753 range(0, max_jint) \ 3754 \ 3755 product(intx, TieredCompileTaskTimeout, 50, \ 3756 "Kill compile task if method was not used within " \ 3757 "given timeout in milliseconds") \ 3758 range(0, max_intx) \ 3759 \ 3760 product(intx, TieredStopAtLevel, 4, \ 3761 "Stop at given compilation level") \ 3762 range(0, 4) \ 3763 \ 3764 product(intx, Tier0ProfilingStartPercentage, 200, \ 3765 "Start profiling in interpreter if the counters exceed tier 3 " \ 3766 "thresholds by the specified percentage") \ 3767 range(0, max_jint) \ 3768 \ 3769 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3770 "Increase the compile threshold for C1 compilation if the code " \ 3771 "cache is filled by the specified percentage") \ 3772 range(0, 99) \ 3773 \ 3774 product(intx, TieredRateUpdateMinTime, 1, \ 3775 "Minimum rate sampling interval (in milliseconds)") \ 3776 range(0, max_intx) \ 3777 \ 3778 product(intx, TieredRateUpdateMaxTime, 25, \ 3779 "Maximum rate sampling interval (in milliseconds)") \ 3780 range(0, max_intx) \ 3781 \ 3782 product_pd(bool, TieredCompilation, \ 3783 "Enable tiered compilation") \ 3784 \ 3785 product(bool, PrintTieredEvents, false, \ 3786 "Print tiered events notifications") \ 3787 \ 3788 product_pd(intx, OnStackReplacePercentage, \ 3789 "NON_TIERED number of method invocations/branches (expressed as " \ 3790 "% of CompileThreshold) before (re-)compiling OSR code") \ 3791 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3792 \ 3793 product(intx, InterpreterProfilePercentage, 33, \ 3794 "NON_TIERED number of method invocations/branches (expressed as " \ 3795 "% of CompileThreshold) before profiling in the interpreter") \ 3796 range(0, 100) \ 3797 \ 3798 develop(intx, MaxRecompilationSearchLength, 10, \ 3799 "The maximum number of frames to inspect when searching for " \ 3800 "recompilee") \ 3801 \ 3802 develop(intx, MaxInterpretedSearchLength, 3, \ 3803 "The maximum number of interpreted frames to skip when searching "\ 3804 "for recompilee") \ 3805 \ 3806 develop(intx, DesiredMethodLimit, 8000, \ 3807 "The desired maximum method size (in bytecodes) after inlining") \ 3808 \ 3809 develop(intx, HugeMethodLimit, 8000, \ 3810 "Don't compile methods larger than this if " \ 3811 "+DontCompileHugeMethods") \ 3812 \ 3813 /* New JDK 1.4 reflection implementation */ \ 3814 \ 3815 develop(intx, FastSuperclassLimit, 8, \ 3816 "Depth of hardwired instanceof accelerator array") \ 3817 \ 3818 /* Properties for Java libraries */ \ 3819 \ 3820 product(uint64_t, MaxDirectMemorySize, 0, \ 3821 "Maximum total size of NIO direct-buffer allocations") \ 3822 range(0, max_jlong) \ 3823 \ 3824 /* Flags used for temporary code during development */ \ 3825 \ 3826 diagnostic(bool, UseNewCode, false, \ 3827 "Testing Only: Use the new version while testing") \ 3828 \ 3829 diagnostic(bool, UseNewCode2, false, \ 3830 "Testing Only: Use the new version while testing") \ 3831 \ 3832 diagnostic(bool, UseNewCode3, false, \ 3833 "Testing Only: Use the new version while testing") \ 3834 \ 3835 /* flags for performance data collection */ \ 3836 \ 3837 product(bool, UsePerfData, true, \ 3838 "Flag to disable jvmstat instrumentation for performance testing "\ 3839 "and problem isolation purposes") \ 3840 \ 3841 product(bool, PerfDataSaveToFile, false, \ 3842 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3843 \ 3844 product(ccstr, PerfDataSaveFile, NULL, \ 3845 "Save PerfData memory to the specified absolute pathname. " \ 3846 "The string %p in the file name (if present) " \ 3847 "will be replaced by pid") \ 3848 \ 3849 product(intx, PerfDataSamplingInterval, 50, \ 3850 "Data sampling interval (in milliseconds)") \ 3851 range(PeriodicTask::min_interval, max_jint) \ 3852 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3853 \ 3854 product(bool, PerfDisableSharedMem, false, \ 3855 "Store performance data in standard memory") \ 3856 \ 3857 product(intx, PerfDataMemorySize, 32*K, \ 3858 "Size of performance data memory region. Will be rounded " \ 3859 "up to a multiple of the native os page size.") \ 3860 range(128, 32*64*K) \ 3861 \ 3862 product(intx, PerfMaxStringConstLength, 1024, \ 3863 "Maximum PerfStringConstant string length before truncation") \ 3864 range(32, 32*K) \ 3865 \ 3866 product(bool, PerfAllowAtExitRegistration, false, \ 3867 "Allow registration of atexit() methods") \ 3868 \ 3869 product(bool, PerfBypassFileSystemCheck, false, \ 3870 "Bypass Win32 file system criteria checks (Windows Only)") \ 3871 \ 3872 product(intx, UnguardOnExecutionViolation, 0, \ 3873 "Unguard page and retry on no-execute fault (Win32 only) " \ 3874 "0=off, 1=conservative, 2=aggressive") \ 3875 range(0, 2) \ 3876 \ 3877 /* Serviceability Support */ \ 3878 \ 3879 product(bool, ManagementServer, false, \ 3880 "Create JMX Management Server") \ 3881 \ 3882 product(bool, DisableAttachMechanism, false, \ 3883 "Disable mechanism that allows tools to attach to this VM") \ 3884 \ 3885 product(bool, StartAttachListener, false, \ 3886 "Always start Attach Listener at VM startup") \ 3887 \ 3888 product(bool, EnableDynamicAgentLoading, true, \ 3889 "Allow tools to load agents with the attach mechanism") \ 3890 \ 3891 manageable(bool, PrintConcurrentLocks, false, \ 3892 "Print java.util.concurrent locks in thread dump") \ 3893 \ 3894 product(bool, TransmitErrorReport, false, \ 3895 "Enable error report transmission on erroneous termination") \ 3896 \ 3897 product(ccstr, ErrorReportServer, NULL, \ 3898 "Override built-in error report server address") \ 3899 \ 3900 /* Shared spaces */ \ 3901 \ 3902 product(bool, UseSharedSpaces, true, \ 3903 "Use shared spaces for metadata") \ 3904 \ 3905 product(bool, VerifySharedSpaces, false, \ 3906 "Verify shared spaces (false for default archive, true for " \ 3907 "archive specified by -XX:SharedArchiveFile)") \ 3908 \ 3909 product(bool, RequireSharedSpaces, false, \ 3910 "Require shared spaces for metadata") \ 3911 \ 3912 product(bool, DumpSharedSpaces, false, \ 3913 "Special mode: JVM reads a class list, loads classes, builds " \ 3914 "shared spaces, and dumps the shared spaces to a file to be " \ 3915 "used in future JVM runs") \ 3916 \ 3917 product(bool, PrintSharedArchiveAndExit, false, \ 3918 "Print shared archive file contents") \ 3919 \ 3920 product(bool, PrintSharedDictionary, false, \ 3921 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3922 "dictionary") \ 3923 \ 3924 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3925 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3926 "Address to allocate shared memory region for class data") \ 3927 range(0, SIZE_MAX) \ 3928 \ 3929 product(uintx, SharedSymbolTableBucketSize, 4, \ 3930 "Average number of symbols per bucket in shared table") \ 3931 range(2, 246) \ 3932 \ 3933 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \ 3934 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3935 "classes. Just exclude them from the shared dictionary.") \ 3936 \ 3937 diagnostic(bool, PrintMethodHandleStubs, false, \ 3938 "Print generated stub code for method handles") \ 3939 \ 3940 develop(bool, TraceMethodHandles, false, \ 3941 "trace internal method handle operations") \ 3942 \ 3943 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3944 "perform extra checks when constructing method handles") \ 3945 \ 3946 diagnostic(bool, ShowHiddenFrames, false, \ 3947 "show method handle implementation frames (usually hidden)") \ 3948 \ 3949 experimental(bool, TrustFinalNonStaticFields, false, \ 3950 "trust final non-static declarations for constant folding") \ 3951 \ 3952 diagnostic(bool, FoldStableValues, true, \ 3953 "Optimize loads from stable fields (marked w/ @Stable)") \ 3954 \ 3955 develop(bool, TraceInvokeDynamic, false, \ 3956 "trace internal invoke dynamic operations") \ 3957 \ 3958 diagnostic(bool, PauseAtStartup, false, \ 3959 "Causes the VM to pause at startup time and wait for the pause " \ 3960 "file to be removed (default: ./vm.paused.<pid>)") \ 3961 \ 3962 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3963 "The file to create and for whose removal to await when pausing " \ 3964 "at startup. (default: ./vm.paused.<pid>)") \ 3965 \ 3966 diagnostic(bool, PauseAtExit, false, \ 3967 "Pause and wait for keypress on exit if a debugger is attached") \ 3968 \ 3969 product(bool, ExtendedDTraceProbes, false, \ 3970 "Enable performance-impacting dtrace probes") \ 3971 \ 3972 product(bool, DTraceMethodProbes, false, \ 3973 "Enable dtrace probes for method-entry and method-exit") \ 3974 \ 3975 product(bool, DTraceAllocProbes, false, \ 3976 "Enable dtrace probes for object allocation") \ 3977 \ 3978 product(bool, DTraceMonitorProbes, false, \ 3979 "Enable dtrace probes for monitor events") \ 3980 \ 3981 product(bool, RelaxAccessControlCheck, false, \ 3982 "Relax the access control checks in the verifier") \ 3983 \ 3984 product(uintx, StringTableSize, defaultStringTableSize, \ 3985 "Number of buckets in the interned String table") \ 3986 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3987 \ 3988 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3989 "Number of buckets in the JVM internal Symbol table") \ 3990 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3991 \ 3992 product(bool, UseStringDeduplication, false, \ 3993 "Use string deduplication") \ 3994 \ 3995 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3996 "A string must reach this age (or be promoted to an old region) " \ 3997 "to be considered for deduplication") \ 3998 range(1, markOopDesc::max_age) \ 3999 \ 4000 diagnostic(bool, StringDeduplicationResizeALot, false, \ 4001 "Force table resize every time the table is scanned") \ 4002 \ 4003 diagnostic(bool, StringDeduplicationRehashALot, false, \ 4004 "Force table rehash every time the table is scanned") \ 4005 \ 4006 diagnostic(bool, WhiteBoxAPI, false, \ 4007 "Enable internal testing APIs") \ 4008 \ 4009 experimental(intx, SurvivorAlignmentInBytes, 0, \ 4010 "Default survivor space alignment in bytes") \ 4011 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 4012 \ 4013 product(bool , AllowNonVirtualCalls, false, \ 4014 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4015 \ 4016 product(ccstr, DumpLoadedClassList, NULL, \ 4017 "Dump the names all loaded classes, that could be stored into " \ 4018 "the CDS archive, in the specified file") \ 4019 \ 4020 product(ccstr, SharedClassListFile, NULL, \ 4021 "Override the default CDS class list") \ 4022 \ 4023 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4024 "Override the default location of the CDS archive file") \ 4025 \ 4026 product(ccstr, ExtraSharedClassListFile, NULL, \ 4027 "Extra classlist for building the CDS archive file") \ 4028 \ 4029 experimental(size_t, ArrayAllocatorMallocLimit, \ 4030 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4031 "Allocation less than this value will be allocated " \ 4032 "using malloc. Larger allocations will use mmap.") \ 4033 \ 4034 experimental(bool, AlwaysAtomicAccesses, false, \ 4035 "Accesses to all variables should always be atomic") \ 4036 \ 4037 product(bool, EnableTracing, false, \ 4038 "Enable event-based tracing") \ 4039 \ 4040 product(bool, UseLockedTracing, false, \ 4041 "Use locked-tracing when doing event-based tracing") \ 4042 \ 4043 diagnostic(bool, UseUnalignedAccesses, false, \ 4044 "Use unaligned memory accesses in Unsafe") \ 4045 \ 4046 product_pd(bool, PreserveFramePointer, \ 4047 "Use the FP register for holding the frame pointer " \ 4048 "and not as a general purpose register.") \ 4049 \ 4050 diagnostic(bool, CheckIntrinsics, true, \ 4051 "When a class C is loaded, check that " \ 4052 "(1) all intrinsics defined by the VM for class C are present "\ 4053 "in the loaded class file and are marked with the " \ 4054 "@HotSpotIntrinsicCandidate annotation, that " \ 4055 "(2) there is an intrinsic registered for all loaded methods " \ 4056 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4057 "annotation, and that " \ 4058 "(3) no orphan methods exist for class C (i.e., methods for " \ 4059 "which the VM declares an intrinsic but that are not declared "\ 4060 "in the loaded class C. " \ 4061 "Check (3) is available only in debug builds.") \ 4062 \ 4063 diagnostic_pd(intx, InitArrayShortSize, \ 4064 "Threshold small size (in bytes) for clearing arrays. " \ 4065 "Anything this size or smaller may get converted to discrete " \ 4066 "scalar stores.") \ 4067 range(0, max_intx) \ 4068 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4069 \ 4070 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4071 "Disable backwards compatibility for compile commands.") \ 4072 \ 4073 diagnostic(bool, CompilerDirectivesPrint, false, \ 4074 "Print compiler directives on installation.") \ 4075 diagnostic(int, CompilerDirectivesLimit, 50, \ 4076 "Limit on number of compiler directives.") 4077 4078 4079 /* 4080 * Macros for factoring of globals 4081 */ 4082 4083 // Interface macros 4084 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4085 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4086 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4087 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4088 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4089 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4090 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4091 #ifdef PRODUCT 4092 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4093 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4094 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4095 #else 4096 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4097 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4098 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4099 #endif // PRODUCT 4100 // Special LP64 flags, product only needed for now. 4101 #ifdef _LP64 4102 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4103 #else 4104 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4105 #endif // _LP64 4106 4107 // Implementation macros 4108 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4109 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4110 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4111 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4112 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4113 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4114 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4115 #ifdef PRODUCT 4116 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4117 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4118 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4119 #else 4120 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4121 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4122 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4123 #endif // PRODUCT 4124 #ifdef _LP64 4125 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4126 #else 4127 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4128 #endif // _LP64 4129 4130 // Only materialize src code for range checking when required, ignore otherwise 4131 #define IGNORE_RANGE(a, b) 4132 // Only materialize src code for contraint checking when required, ignore otherwise 4133 #define IGNORE_CONSTRAINT(func,type) 4134 4135 #define IGNORE_WRITEABLE(type) 4136 4137 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4138 DECLARE_PD_DEVELOPER_FLAG, \ 4139 DECLARE_PRODUCT_FLAG, \ 4140 DECLARE_PD_PRODUCT_FLAG, \ 4141 DECLARE_DIAGNOSTIC_FLAG, \ 4142 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4143 DECLARE_EXPERIMENTAL_FLAG, \ 4144 DECLARE_NOTPRODUCT_FLAG, \ 4145 DECLARE_MANAGEABLE_FLAG, \ 4146 DECLARE_PRODUCT_RW_FLAG, \ 4147 DECLARE_LP64_PRODUCT_FLAG, \ 4148 IGNORE_RANGE, \ 4149 IGNORE_CONSTRAINT, \ 4150 IGNORE_WRITEABLE) 4151 4152 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4153 DECLARE_PD_DEVELOPER_FLAG, \ 4154 DECLARE_PRODUCT_FLAG, \ 4155 DECLARE_PD_PRODUCT_FLAG, \ 4156 DECLARE_DIAGNOSTIC_FLAG, \ 4157 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4158 DECLARE_NOTPRODUCT_FLAG, \ 4159 IGNORE_RANGE, \ 4160 IGNORE_CONSTRAINT, \ 4161 IGNORE_WRITEABLE) 4162 4163 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4164 DECLARE_PRODUCT_FLAG, \ 4165 DECLARE_DIAGNOSTIC_FLAG, \ 4166 DECLARE_EXPERIMENTAL_FLAG, \ 4167 DECLARE_NOTPRODUCT_FLAG, \ 4168 IGNORE_RANGE, \ 4169 IGNORE_CONSTRAINT, \ 4170 IGNORE_WRITEABLE) 4171 4172 // Extensions 4173 4174 #include "runtime/globals_ext.hpp" 4175 4176 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP