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