globals.hpp revision 13082:72abda3e08b6
1290968Sngie/* 2290968Sngie * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3298107Sgjb * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4299094Sngie * 5293821Sngie * This code is free software; you can redistribute it and/or modify it 6293821Sngie * under the terms of the GNU General Public License version 2 only, as 7312829Sasomers * published by the Free Software Foundation. 8290968Sngie * 9290968Sngie * 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 61define_pd_global(bool, BackgroundCompilation, false); 62define_pd_global(bool, UseTLAB, false); 63define_pd_global(bool, CICompileOSR, false); 64define_pd_global(bool, UseTypeProfile, false); 65define_pd_global(bool, UseOnStackReplacement, false); 66define_pd_global(bool, InlineIntrinsics, false); 67define_pd_global(bool, PreferInterpreterNativeStubs, true); 68define_pd_global(bool, ProfileInterpreter, false); 69define_pd_global(bool, ProfileTraps, false); 70define_pd_global(bool, TieredCompilation, false); 71 72define_pd_global(intx, CompileThreshold, 0); 73 74define_pd_global(intx, OnStackReplacePercentage, 0); 75define_pd_global(bool, ResizeTLAB, false); 76define_pd_global(intx, FreqInlineSize, 0); 77define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 78define_pd_global(intx, InlineClassNatives, true); 79define_pd_global(intx, InlineUnsafeOps, true); 80define_pd_global(intx, InitialCodeCacheSize, 160*K); 81define_pd_global(intx, ReservedCodeCacheSize, 32*M); 82define_pd_global(intx, NonProfiledCodeHeapSize, 0); 83define_pd_global(intx, ProfiledCodeHeapSize, 0); 84define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 85 86define_pd_global(intx, CodeCacheExpansionSize, 32*K); 87define_pd_global(intx, CodeCacheMinBlockLength, 1); 88define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 89define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 90define_pd_global(bool, NeverActAsServerClassMachine, true); 91define_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 104typedef const char* ccstr; 105typedef const char* ccstrlist; // represents string arguments which accumulate 106 107// function type that will construct default range string 108typedef const char* (*RangeStrFunc)(void); 109 110struct 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 size_t _name_len; 190 191 // points to all Flags static array 192 static Flag* flags; 193 194 // number of flags 195 static size_t numFlags; 196 197 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 198 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 199 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 200 201 static const char* get_int_default_range_str(); 202 static const char* get_uint_default_range_str(); 203 static const char* get_intx_default_range_str(); 204 static const char* get_uintx_default_range_str(); 205 static const char* get_uint64_t_default_range_str(); 206 static const char* get_size_t_default_range_str(); 207 static const char* get_double_default_range_str(); 208 209 Flag::Error check_writable(bool changed); 210 211 bool is_bool() const; 212 bool get_bool() const; 213 Flag::Error set_bool(bool value); 214 215 bool is_int() const; 216 int get_int() const; 217 Flag::Error set_int(int value); 218 219 bool is_uint() const; 220 uint get_uint() const; 221 Flag::Error set_uint(uint value); 222 223 bool is_intx() const; 224 intx get_intx() const; 225 Flag::Error set_intx(intx value); 226 227 bool is_uintx() const; 228 uintx get_uintx() const; 229 Flag::Error set_uintx(uintx value); 230 231 bool is_uint64_t() const; 232 uint64_t get_uint64_t() const; 233 Flag::Error set_uint64_t(uint64_t value); 234 235 bool is_size_t() const; 236 size_t get_size_t() const; 237 Flag::Error set_size_t(size_t value); 238 239 bool is_double() const; 240 double get_double() const; 241 Flag::Error set_double(double value); 242 243 bool is_ccstr() const; 244 bool ccstr_accumulates() const; 245 ccstr get_ccstr() const; 246 Flag::Error set_ccstr(ccstr value); 247 248 Flags get_origin(); 249 void set_origin(Flags origin); 250 251 size_t get_name_length(); 252 253 bool is_default(); 254 bool is_ergonomic(); 255 bool is_command_line(); 256 void set_command_line(); 257 258 bool is_product() const; 259 bool is_manageable() const; 260 bool is_diagnostic() const; 261 bool is_experimental() const; 262 bool is_notproduct() const; 263 bool is_develop() const; 264 bool is_read_write() const; 265 bool is_commercial() const; 266 267 bool is_constant_in_binary() const; 268 269 bool is_unlocker() const; 270 bool is_unlocked() const; 271 bool is_writeable() const; 272 bool is_external() const; 273 274 bool is_unlocker_ext() const; 275 bool is_unlocked_ext() const; 276 bool is_writeable_ext() const; 277 bool is_external_ext() const; 278 279 void clear_diagnostic(); 280 281 Flag::MsgType get_locked_message(char*, int) const; 282 void get_locked_message_ext(char*, int) const; 283 284 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 285 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 286 void print_kind_and_origin(outputStream* st); 287 void print_as_flag(outputStream* st); 288 289 static const char* flag_error_str(Flag::Error error); 290}; 291 292// debug flags control various aspects of the VM and are global accessible 293 294// use FlagSetting to temporarily change some debug flag 295// e.g. FlagSetting fs(DebugThisAndThat, true); 296// restored to previous value upon leaving scope 297class FlagSetting { 298 bool val; 299 bool* flag; 300 public: 301 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 302 ~FlagSetting() { *flag = val; } 303}; 304 305 306class CounterSetting { 307 intx* counter; 308 public: 309 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 310 ~CounterSetting() { (*counter)--; } 311}; 312 313class IntFlagSetting { 314 int val; 315 int* flag; 316 public: 317 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 318 ~IntFlagSetting() { *flag = val; } 319}; 320 321class UIntFlagSetting { 322 uint val; 323 uint* flag; 324 public: 325 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 326 ~UIntFlagSetting() { *flag = val; } 327}; 328 329class UIntXFlagSetting { 330 uintx val; 331 uintx* flag; 332 public: 333 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 334 ~UIntXFlagSetting() { *flag = val; } 335}; 336 337class DoubleFlagSetting { 338 double val; 339 double* flag; 340 public: 341 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 342 ~DoubleFlagSetting() { *flag = val; } 343}; 344 345class SizeTFlagSetting { 346 size_t val; 347 size_t* flag; 348 public: 349 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 350 ~SizeTFlagSetting() { *flag = val; } 351}; 352 353// Helper class for temporarily saving the value of a flag during a scope. 354template <size_t SIZE> 355class FlagGuard { 356 unsigned char _value[SIZE]; 357 void* const _addr; 358 359 // Hide operator new, this class should only be allocated on the stack. 360 // NOTE: Cannot include memory/allocation.hpp here due to circular 361 // dependencies. 362 void* operator new(size_t size) throw(); 363 void* operator new [](size_t size) throw(); 364 365 public: 366 FlagGuard(void* flag_addr) : _addr(flag_addr) { 367 memcpy(_value, _addr, SIZE); 368 } 369 370 ~FlagGuard() { 371 memcpy(_addr, _value, SIZE); 372 } 373}; 374 375#define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 376 377class CommandLineFlags { 378public: 379 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 380 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); } 381 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 382 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 383 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 384 385 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 386 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); } 387 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 388 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 389 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 390 391 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 392 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); } 393 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 394 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 395 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 396 397 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 398 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); } 399 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 400 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 401 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 402 403 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 404 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); } 405 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 406 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 407 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 408 409 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 410 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); } 411 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 412 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 413 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 414 415 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 416 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); } 417 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 418 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 419 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 420 421 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 422 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); } 423 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 424 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 425 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 426 427 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 428 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); } 429 // Contract: Flag will make private copy of the incoming value. 430 // Outgoing value is always malloc-ed, and caller MUST call free. 431 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 432 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 433 434 // Returns false if name is not a command line flag. 435 static bool wasSetOnCmdline(const char* name, bool* value); 436 static void printSetFlags(outputStream* out); 437 438 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 439 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 440 441 static void verify() PRODUCT_RETURN; 442}; 443 444// use this for flags that are true by default in the debug version but 445// false in the optimized version, and vice versa 446#ifdef ASSERT 447#define trueInDebug true 448#define falseInDebug false 449#else 450#define trueInDebug false 451#define falseInDebug true 452#endif 453 454// use this for flags that are true per default in the product build 455// but false in development builds, and vice versa 456#ifdef PRODUCT 457#define trueInProduct true 458#define falseInProduct false 459#else 460#define trueInProduct false 461#define falseInProduct true 462#endif 463 464// develop flags are settable / visible only during development and are constant in the PRODUCT version 465// product flags are always settable / visible 466// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 467 468// A flag must be declared with one of the following types: 469// bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 470// The type "ccstr" is an alias for "const char*" and is used 471// only in this file, because the macrology requires single-token type names. 472 473// Note: Diagnostic options not meant for VM tuning or for product modes. 474// They are to be used for VM quality assurance or field diagnosis 475// of VM bugs. They are hidden so that users will not be encouraged to 476// try them as if they were VM ordinary execution options. However, they 477// are available in the product version of the VM. Under instruction 478// from support engineers, VM customers can turn them on to collect 479// diagnostic information about VM problems. To use a VM diagnostic 480// option, you must first specify +UnlockDiagnosticVMOptions. 481// (This master switch also affects the behavior of -Xprintflags.) 482// 483// experimental flags are in support of features that are not 484// part of the officially supported product, but are available 485// for experimenting with. They could, for example, be performance 486// features that may not have undergone full or rigorous QA, but which may 487// help performance in some cases and released for experimentation 488// by the community of users and developers. This flag also allows one to 489// be able to build a fully supported product that nonetheless also 490// ships with some unsupported, lightly tested, experimental features. 491// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 492// UnlockExperimentalVMOptions flag, which allows the control and 493// modification of the experimental flags. 494// 495// Nota bene: neither diagnostic nor experimental options should be used casually, 496// and they are not supported on production loads, except under explicit 497// direction from support engineers. 498// 499// manageable flags are writeable external product flags. 500// They are dynamically writeable through the JDK management interface 501// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 502// These flags are external exported interface (see CCC). The list of 503// manageable flags can be queried programmatically through the management 504// interface. 505// 506// A flag can be made as "manageable" only if 507// - the flag is defined in a CCC as an external exported interface. 508// - the VM implementation supports dynamic setting of the flag. 509// This implies that the VM must *always* query the flag variable 510// and not reuse state related to the flag state at any given time. 511// - you want the flag to be queried programmatically by the customers. 512// 513// product_rw flags are writeable internal product flags. 514// They are like "manageable" flags but for internal/private use. 515// The list of product_rw flags are internal/private flags which 516// may be changed/removed in a future release. It can be set 517// through the management interface to get/set value 518// when the name of flag is supplied. 519// 520// A flag can be made as "product_rw" only if 521// - the VM implementation supports dynamic setting of the flag. 522// This implies that the VM must *always* query the flag variable 523// and not reuse state related to the flag state at any given time. 524// 525// Note that when there is a need to support develop flags to be writeable, 526// it can be done in the same way as product_rw. 527// 528// range is a macro that will expand to min and max arguments for range 529// checking code if provided - see commandLineFlagRangeList.hpp 530// 531// constraint is a macro that will expand to custom function call 532// for constraint checking if provided - see commandLineFlagConstraintList.hpp 533// 534// writeable is a macro that controls if and how the value can change during the runtime 535// 536// writeable(Always) is optional and allows the flag to have its value changed 537// without any limitations at any time 538// 539// writeable(Once) flag value's can be only set once during the lifetime of VM 540// 541// writeable(CommandLineOnly) flag value's can be only set from command line 542// (multiple times allowed) 543// 544 545 546#define RUNTIME_FLAGS(develop, \ 547 develop_pd, \ 548 product, \ 549 product_pd, \ 550 diagnostic, \ 551 diagnostic_pd, \ 552 experimental, \ 553 notproduct, \ 554 manageable, \ 555 product_rw, \ 556 lp64_product, \ 557 range, \ 558 constraint, \ 559 writeable) \ 560 \ 561 lp64_product(bool, UseCompressedOops, false, \ 562 "Use 32-bit object references in 64-bit VM. " \ 563 "lp64_product means flag is always constant in 32 bit VM") \ 564 \ 565 lp64_product(bool, UseCompressedClassPointers, false, \ 566 "Use 32-bit class pointers in 64-bit VM. " \ 567 "lp64_product means flag is always constant in 32 bit VM") \ 568 \ 569 notproduct(bool, CheckCompressedOops, true, \ 570 "Generate checks in encoding/decoding code in debug VM") \ 571 \ 572 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 573 "Heap allocation steps through preferred address regions to find" \ 574 " where it can allocate the heap. Number of steps to take per " \ 575 "region.") \ 576 range(1, max_uintx) \ 577 \ 578 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 579 "Default object alignment in bytes, 8 is minimum") \ 580 range(8, 256) \ 581 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 582 \ 583 product(bool, AssumeMP, false, \ 584 "Instruct the VM to assume multiple processors are available") \ 585 \ 586 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 587 /* removal testing. It was supposed to be removed before FCS but has */ \ 588 /* been re-added (see 6401008) */ \ 589 product_pd(bool, UseMembar, \ 590 "(Unstable) Issues membars on thread state transitions") \ 591 \ 592 develop(bool, CleanChunkPoolAsync, true, \ 593 "Clean the chunk pool asynchronously") \ 594 \ 595 experimental(bool, AlwaysSafeConstructors, false, \ 596 "Force safe construction, as if all fields are final.") \ 597 \ 598 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 599 "Enable normal processing of flags relating to field diagnostics")\ 600 \ 601 experimental(bool, UnlockExperimentalVMOptions, false, \ 602 "Enable normal processing of flags relating to experimental " \ 603 "features") \ 604 \ 605 product(bool, JavaMonitorsInStackTrace, true, \ 606 "Print information about Java monitor locks when the stacks are" \ 607 "dumped") \ 608 \ 609 product_pd(bool, UseLargePages, \ 610 "Use large page memory") \ 611 \ 612 product_pd(bool, UseLargePagesIndividualAllocation, \ 613 "Allocate large pages individually for better affinity") \ 614 \ 615 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 616 "Fail large pages individual allocation") \ 617 \ 618 product(bool, UseLargePagesInMetaspace, false, \ 619 "Use large page memory in metaspace. " \ 620 "Only used if UseLargePages is enabled.") \ 621 \ 622 product(bool, UseNUMA, false, \ 623 "Use NUMA if available") \ 624 \ 625 product(bool, UseNUMAInterleaving, false, \ 626 "Interleave memory across NUMA nodes if available") \ 627 \ 628 product(size_t, NUMAInterleaveGranularity, 2*M, \ 629 "Granularity to use for NUMA interleaving on Windows OS") \ 630 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 631 \ 632 product(bool, ForceNUMA, false, \ 633 "Force NUMA optimizations on single-node/UMA systems") \ 634 \ 635 product(uintx, NUMAChunkResizeWeight, 20, \ 636 "Percentage (0-100) used to weight the current sample when " \ 637 "computing exponentially decaying average for " \ 638 "AdaptiveNUMAChunkSizing") \ 639 range(0, 100) \ 640 \ 641 product(size_t, NUMASpaceResizeRate, 1*G, \ 642 "Do not reallocate more than this amount per collection") \ 643 range(0, max_uintx) \ 644 \ 645 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 646 "Enable adaptive chunk sizing for NUMA") \ 647 \ 648 product(bool, NUMAStats, false, \ 649 "Print NUMA stats in detailed heap information") \ 650 \ 651 product(uintx, NUMAPageScanRate, 256, \ 652 "Maximum number of pages to include in the page scan procedure") \ 653 range(0, max_uintx) \ 654 \ 655 product_pd(bool, NeedsDeoptSuspend, \ 656 "True for register window machines (sparc/ia64)") \ 657 \ 658 product(intx, UseSSE, 99, \ 659 "Highest supported SSE instructions set on x86/x64") \ 660 range(0, 99) \ 661 \ 662 product(bool, UseAES, false, \ 663 "Control whether AES instructions are used when available") \ 664 \ 665 product(bool, UseFMA, false, \ 666 "Control whether FMA instructions are used when available") \ 667 \ 668 product(bool, UseSHA, false, \ 669 "Control whether SHA instructions are used when available") \ 670 \ 671 diagnostic(bool, UseGHASHIntrinsics, false, \ 672 "Use intrinsics for GHASH versions of crypto") \ 673 \ 674 product(size_t, LargePageSizeInBytes, 0, \ 675 "Large page size (0 to let VM choose the page size)") \ 676 range(0, max_uintx) \ 677 \ 678 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 679 "Use large pages if maximum heap is at least this big") \ 680 range(0, max_uintx) \ 681 \ 682 product(bool, ForceTimeHighResolution, false, \ 683 "Using high time resolution (for Win32 only)") \ 684 \ 685 develop(bool, TracePcPatching, false, \ 686 "Trace usage of frame::patch_pc") \ 687 \ 688 develop(bool, TraceRelocator, false, \ 689 "Trace the bytecode relocator") \ 690 \ 691 develop(bool, TraceLongCompiles, false, \ 692 "Print out every time compilation is longer than " \ 693 "a given threshold") \ 694 \ 695 develop(bool, SafepointALot, false, \ 696 "Generate a lot of safepoints. This works with " \ 697 "GuaranteedSafepointInterval") \ 698 \ 699 product_pd(bool, BackgroundCompilation, \ 700 "A thread requesting compilation is not blocked during " \ 701 "compilation") \ 702 \ 703 product(bool, PrintVMQWaitTime, false, \ 704 "Print out the waiting time in VM operation queue") \ 705 \ 706 develop(bool, TraceOopMapGeneration, false, \ 707 "Show OopMapGeneration") \ 708 \ 709 product(bool, MethodFlushing, true, \ 710 "Reclamation of zombie and not-entrant methods") \ 711 \ 712 develop(bool, VerifyStack, false, \ 713 "Verify stack of each thread when it is entering a runtime call") \ 714 \ 715 diagnostic(bool, ForceUnreachable, false, \ 716 "Make all non code cache addresses to be unreachable by " \ 717 "forcing use of 64bit literal fixups") \ 718 \ 719 notproduct(bool, StressDerivedPointers, false, \ 720 "Force scavenge when a derived pointer is detected on stack " \ 721 "after rtm call") \ 722 \ 723 develop(bool, TraceDerivedPointers, false, \ 724 "Trace traversal of derived pointers on stack") \ 725 \ 726 notproduct(bool, TraceCodeBlobStacks, false, \ 727 "Trace stack-walk of codeblobs") \ 728 \ 729 product(bool, PrintJNIResolving, false, \ 730 "Used to implement -v:jni") \ 731 \ 732 notproduct(bool, PrintRewrites, false, \ 733 "Print methods that are being rewritten") \ 734 \ 735 product(bool, UseInlineCaches, true, \ 736 "Use Inline Caches for virtual calls ") \ 737 \ 738 diagnostic(bool, InlineArrayCopy, true, \ 739 "Inline arraycopy native that is known to be part of " \ 740 "base library DLL") \ 741 \ 742 diagnostic(bool, InlineObjectHash, true, \ 743 "Inline Object::hashCode() native that is known to be part " \ 744 "of base library DLL") \ 745 \ 746 diagnostic(bool, InlineNatives, true, \ 747 "Inline natives that are known to be part of base library DLL") \ 748 \ 749 diagnostic(bool, InlineMathNatives, true, \ 750 "Inline SinD, CosD, etc.") \ 751 \ 752 diagnostic(bool, InlineClassNatives, true, \ 753 "Inline Class.isInstance, etc") \ 754 \ 755 diagnostic(bool, InlineThreadNatives, true, \ 756 "Inline Thread.currentThread, etc") \ 757 \ 758 diagnostic(bool, InlineUnsafeOps, true, \ 759 "Inline memory ops (native methods) from Unsafe") \ 760 \ 761 product(bool, CriticalJNINatives, true, \ 762 "Check for critical JNI entry points") \ 763 \ 764 notproduct(bool, StressCriticalJNINatives, false, \ 765 "Exercise register saving code in critical natives") \ 766 \ 767 diagnostic(bool, UseAESIntrinsics, false, \ 768 "Use intrinsics for AES versions of crypto") \ 769 \ 770 diagnostic(bool, UseAESCTRIntrinsics, false, \ 771 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 772 \ 773 diagnostic(bool, UseSHA1Intrinsics, false, \ 774 "Use intrinsics for SHA-1 crypto hash function. " \ 775 "Requires that UseSHA is enabled.") \ 776 \ 777 diagnostic(bool, UseSHA256Intrinsics, false, \ 778 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 779 "Requires that UseSHA is enabled.") \ 780 \ 781 diagnostic(bool, UseSHA512Intrinsics, false, \ 782 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 783 "Requires that UseSHA is enabled.") \ 784 \ 785 diagnostic(bool, UseCRC32Intrinsics, false, \ 786 "use intrinsics for java.util.zip.CRC32") \ 787 \ 788 diagnostic(bool, UseCRC32CIntrinsics, false, \ 789 "use intrinsics for java.util.zip.CRC32C") \ 790 \ 791 diagnostic(bool, UseAdler32Intrinsics, false, \ 792 "use intrinsics for java.util.zip.Adler32") \ 793 \ 794 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 795 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 796 \ 797 diagnostic(ccstrlist, DisableIntrinsic, "", \ 798 "do not expand intrinsics whose (internal) names appear here") \ 799 \ 800 develop(bool, TraceCallFixup, false, \ 801 "Trace all call fixups") \ 802 \ 803 develop(bool, DeoptimizeALot, false, \ 804 "Deoptimize at every exit from the runtime system") \ 805 \ 806 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 807 "A comma separated list of bcis to deoptimize at") \ 808 \ 809 product(bool, DeoptimizeRandom, false, \ 810 "Deoptimize random frames on random exit from the runtime system")\ 811 \ 812 notproduct(bool, ZombieALot, false, \ 813 "Create zombies (non-entrant) at exit from the runtime system") \ 814 \ 815 product(bool, UnlinkSymbolsALot, false, \ 816 "Unlink unreferenced symbols from the symbol table at safepoints")\ 817 \ 818 notproduct(bool, WalkStackALot, false, \ 819 "Trace stack (no print) at every exit from the runtime system") \ 820 \ 821 product(bool, Debugging, false, \ 822 "Set when executing debug methods in debug.cpp " \ 823 "(to prevent triggering assertions)") \ 824 \ 825 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 826 "Enable strict checks that safepoints cannot happen for threads " \ 827 "that use NoSafepointVerifier") \ 828 \ 829 notproduct(bool, VerifyLastFrame, false, \ 830 "Verify oops on last frame on entry to VM") \ 831 \ 832 product(bool, FailOverToOldVerifier, true, \ 833 "Fail over to old verifier when split verifier fails") \ 834 \ 835 develop(bool, ShowSafepointMsgs, false, \ 836 "Show message about safepoint synchronization") \ 837 \ 838 product(bool, SafepointTimeout, false, \ 839 "Time out and warn or fail after SafepointTimeoutDelay " \ 840 "milliseconds if failed to reach safepoint") \ 841 \ 842 develop(bool, DieOnSafepointTimeout, false, \ 843 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 844 \ 845 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 846 /* typically, at most a few retries are needed */ \ 847 product(intx, SuspendRetryCount, 50, \ 848 "Maximum retry count for an external suspend request") \ 849 range(0, max_intx) \ 850 \ 851 product(intx, SuspendRetryDelay, 5, \ 852 "Milliseconds to delay per retry (* current_retry_count)") \ 853 range(0, max_intx) \ 854 \ 855 product(bool, AssertOnSuspendWaitFailure, false, \ 856 "Assert/Guarantee on external suspend wait failure") \ 857 \ 858 product(bool, TraceSuspendWaitFailures, false, \ 859 "Trace external suspend wait failures") \ 860 \ 861 product(bool, MaxFDLimit, true, \ 862 "Bump the number of file descriptors to maximum in Solaris") \ 863 \ 864 diagnostic(bool, LogEvents, true, \ 865 "Enable the various ring buffer event logs") \ 866 \ 867 diagnostic(uintx, LogEventsBufferEntries, 10, \ 868 "Number of ring buffer event logs") \ 869 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 870 \ 871 product(bool, BytecodeVerificationRemote, true, \ 872 "Enable the Java bytecode verifier for remote classes") \ 873 \ 874 product(bool, BytecodeVerificationLocal, false, \ 875 "Enable the Java bytecode verifier for local classes") \ 876 \ 877 develop(bool, ForceFloatExceptions, trueInDebug, \ 878 "Force exceptions on FP stack under/overflow") \ 879 \ 880 develop(bool, VerifyStackAtCalls, false, \ 881 "Verify that the stack pointer is unchanged after calls") \ 882 \ 883 develop(bool, TraceJavaAssertions, false, \ 884 "Trace java language assertions") \ 885 \ 886 notproduct(bool, CheckAssertionStatusDirectives, false, \ 887 "Temporary - see javaClasses.cpp") \ 888 \ 889 notproduct(bool, PrintMallocFree, false, \ 890 "Trace calls to C heap malloc/free allocation") \ 891 \ 892 notproduct(bool, VerifyCodeCache, false, \ 893 "Verify code cache on memory allocation/deallocation") \ 894 \ 895 develop(bool, UseMallocOnly, false, \ 896 "Use only malloc/free for allocation (no resource area/arena)") \ 897 \ 898 develop(bool, PrintMalloc, false, \ 899 "Print all malloc/free calls") \ 900 \ 901 develop(bool, PrintMallocStatistics, false, \ 902 "Print malloc/free statistics") \ 903 \ 904 develop(bool, ZapResourceArea, trueInDebug, \ 905 "Zap freed resource/arena space with 0xABABABAB") \ 906 \ 907 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 908 "Zap freed VM handle space with 0xBCBCBCBC") \ 909 \ 910 develop(bool, ZapJNIHandleArea, trueInDebug, \ 911 "Zap freed JNI handle space with 0xFEFEFEFE") \ 912 \ 913 notproduct(bool, ZapStackSegments, trueInDebug, \ 914 "Zap allocated/freed stack segments with 0xFADFADED") \ 915 \ 916 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 917 "Zap unused heap space with 0xBAADBABE") \ 918 \ 919 develop(bool, CheckZapUnusedHeapArea, false, \ 920 "Check zapping of unused heap space") \ 921 \ 922 develop(bool, ZapFillerObjects, trueInDebug, \ 923 "Zap filler objects with 0xDEAFBABE") \ 924 \ 925 develop(bool, PrintVMMessages, true, \ 926 "Print VM messages on console") \ 927 \ 928 notproduct(uintx, ErrorHandlerTest, 0, \ 929 "If > 0, provokes an error after VM initialization; the value " \ 930 "determines which error to provoke. See test_error_handler() " \ 931 "in debug.cpp.") \ 932 \ 933 notproduct(uintx, TestCrashInErrorHandler, 0, \ 934 "If > 0, provokes an error inside VM error handler (a secondary " \ 935 "crash). see test_error_handler() in debug.cpp.") \ 936 \ 937 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 938 "If true, tests SafeFetch inside error handler.") \ 939 \ 940 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 941 "If true, simulates an unresponsive error handler.") \ 942 \ 943 develop(bool, Verbose, false, \ 944 "Print additional debugging information from other modes") \ 945 \ 946 develop(bool, PrintMiscellaneous, false, \ 947 "Print uncategorized debugging information (requires +Verbose)") \ 948 \ 949 develop(bool, WizardMode, false, \ 950 "Print much more debugging information") \ 951 \ 952 product(bool, ShowMessageBoxOnError, false, \ 953 "Keep process alive on VM fatal error") \ 954 \ 955 product(bool, CreateCoredumpOnCrash, true, \ 956 "Create core/mini dump on VM fatal error") \ 957 \ 958 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 959 "Timeout, in seconds, to limit the time spent on writing an " \ 960 "error log in case of a crash.") \ 961 range(0, (uint64_t)max_jlong/1000) \ 962 \ 963 product_pd(bool, UseOSErrorReporting, \ 964 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 965 \ 966 product(bool, SuppressFatalErrorMessage, false, \ 967 "Report NO fatal error message (avoid deadlock)") \ 968 \ 969 product(ccstrlist, OnError, "", \ 970 "Run user-defined commands on fatal error; see VMError.cpp " \ 971 "for examples") \ 972 \ 973 product(ccstrlist, OnOutOfMemoryError, "", \ 974 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 975 \ 976 manageable(bool, HeapDumpBeforeFullGC, false, \ 977 "Dump heap to file before any major stop-the-world GC") \ 978 \ 979 manageable(bool, HeapDumpAfterFullGC, false, \ 980 "Dump heap to file after any major stop-the-world GC") \ 981 \ 982 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 983 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 984 \ 985 manageable(ccstr, HeapDumpPath, NULL, \ 986 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 987 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 988 "in the working directory)") \ 989 \ 990 develop(bool, BreakAtWarning, false, \ 991 "Execute breakpoint upon encountering VM warning") \ 992 \ 993 develop(bool, UseFakeTimers, false, \ 994 "Tell whether the VM should use system time or a fake timer") \ 995 \ 996 product(ccstr, NativeMemoryTracking, "off", \ 997 "Native memory tracking options") \ 998 \ 999 diagnostic(bool, PrintNMTStatistics, false, \ 1000 "Print native memory tracking summary data if it is on") \ 1001 \ 1002 diagnostic(bool, LogCompilation, false, \ 1003 "Log compilation activity in detail to LogFile") \ 1004 \ 1005 product(bool, PrintCompilation, false, \ 1006 "Print compilations") \ 1007 \ 1008 diagnostic(bool, TraceNMethodInstalls, false, \ 1009 "Trace nmethod installation") \ 1010 \ 1011 diagnostic(intx, ScavengeRootsInCode, 2, \ 1012 "0: do not allow scavengable oops in the code cache; " \ 1013 "1: allow scavenging from the code cache; " \ 1014 "2: emit as many constants as the compiler can see") \ 1015 range(0, 2) \ 1016 \ 1017 product(bool, AlwaysRestoreFPU, false, \ 1018 "Restore the FPU control word after every JNI call (expensive)") \ 1019 \ 1020 diagnostic(bool, PrintCompilation2, false, \ 1021 "Print additional statistics per compilation") \ 1022 \ 1023 diagnostic(bool, PrintAdapterHandlers, false, \ 1024 "Print code generated for i2c/c2i adapters") \ 1025 \ 1026 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1027 "Verify that i2c/c2i adapters are called properly") \ 1028 \ 1029 develop(bool, VerifyAdapterSharing, false, \ 1030 "Verify that the code for shared adapters is the equivalent") \ 1031 \ 1032 diagnostic(bool, PrintAssembly, false, \ 1033 "Print assembly code (using external disassembler.so)") \ 1034 \ 1035 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1036 "Print options string passed to disassembler.so") \ 1037 \ 1038 notproduct(bool, PrintNMethodStatistics, false, \ 1039 "Print a summary statistic for the generated nmethods") \ 1040 \ 1041 diagnostic(bool, PrintNMethods, false, \ 1042 "Print assembly code for nmethods when generated") \ 1043 \ 1044 diagnostic(bool, PrintNativeNMethods, false, \ 1045 "Print assembly code for native nmethods when generated") \ 1046 \ 1047 develop(bool, PrintDebugInfo, false, \ 1048 "Print debug information for all nmethods when generated") \ 1049 \ 1050 develop(bool, PrintRelocations, false, \ 1051 "Print relocation information for all nmethods when generated") \ 1052 \ 1053 develop(bool, PrintDependencies, false, \ 1054 "Print dependency information for all nmethods when generated") \ 1055 \ 1056 develop(bool, PrintExceptionHandlers, false, \ 1057 "Print exception handler tables for all nmethods when generated") \ 1058 \ 1059 develop(bool, StressCompiledExceptionHandlers, false, \ 1060 "Exercise compiled exception handlers") \ 1061 \ 1062 develop(bool, InterceptOSException, false, \ 1063 "Start debugger when an implicit OS (e.g. NULL) " \ 1064 "exception happens") \ 1065 \ 1066 product(bool, PrintCodeCache, false, \ 1067 "Print the code cache memory usage when exiting") \ 1068 \ 1069 develop(bool, PrintCodeCache2, false, \ 1070 "Print detailed usage information on the code cache when exiting")\ 1071 \ 1072 product(bool, PrintCodeCacheOnCompilation, false, \ 1073 "Print the code cache memory usage each time a method is " \ 1074 "compiled") \ 1075 \ 1076 diagnostic(bool, PrintStubCode, false, \ 1077 "Print generated stub code") \ 1078 \ 1079 product(bool, StackTraceInThrowable, true, \ 1080 "Collect backtrace in throwable when exception happens") \ 1081 \ 1082 product(bool, OmitStackTraceInFastThrow, true, \ 1083 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1084 \ 1085 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1086 "Print bytecode statistics when dumping profiler output") \ 1087 \ 1088 product(bool, ProfilerRecordPC, false, \ 1089 "Collect ticks for each 16 byte interval of compiled code") \ 1090 \ 1091 product(bool, ProfileVM, false, \ 1092 "Profile ticks that fall within VM (either in the VM Thread " \ 1093 "or VM code called through stubs)") \ 1094 \ 1095 product(bool, ProfileIntervals, false, \ 1096 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1097 \ 1098 notproduct(bool, ProfilerCheckIntervals, false, \ 1099 "Collect and print information on spacing of profiler ticks") \ 1100 \ 1101 product(bool, PrintWarnings, true, \ 1102 "Print JVM warnings to output stream") \ 1103 \ 1104 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1105 "Print warnings for stalled SpinLocks") \ 1106 \ 1107 product(bool, RegisterFinalizersAtInit, true, \ 1108 "Register finalizable objects at end of Object.<init> or " \ 1109 "after allocation") \ 1110 \ 1111 develop(bool, RegisterReferences, true, \ 1112 "Tell whether the VM should register soft/weak/final/phantom " \ 1113 "references") \ 1114 \ 1115 develop(bool, IgnoreRewrites, false, \ 1116 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1117 "This is unsafe!") \ 1118 \ 1119 develop(bool, PrintCodeCacheExtension, false, \ 1120 "Print extension of code cache") \ 1121 \ 1122 develop(bool, UsePrivilegedStack, true, \ 1123 "Enable the security JVM functions") \ 1124 \ 1125 develop(bool, ProtectionDomainVerification, true, \ 1126 "Verify protection domain before resolution in system dictionary")\ 1127 \ 1128 product(bool, ClassUnloading, true, \ 1129 "Do unloading of classes") \ 1130 \ 1131 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1132 "Do unloading of classes with a concurrent marking cycle") \ 1133 \ 1134 develop(bool, DisableStartThread, false, \ 1135 "Disable starting of additional Java threads " \ 1136 "(for debugging only)") \ 1137 \ 1138 develop(bool, MemProfiling, false, \ 1139 "Write memory usage profiling to log file") \ 1140 \ 1141 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1142 "Print the system dictionary at exit") \ 1143 \ 1144 experimental(intx, PredictedLoadedClassCount, 0, \ 1145 "Experimental: Tune loaded class cache starting size") \ 1146 \ 1147 diagnostic(bool, UnsyncloadClass, false, \ 1148 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1149 "class loader must call VM synchronized for findClass " \ 1150 "and defineClass.") \ 1151 \ 1152 product(bool, AlwaysLockClassLoader, false, \ 1153 "Require the VM to acquire the class loader lock before calling " \ 1154 "loadClass() even for class loaders registering " \ 1155 "as parallel capable") \ 1156 \ 1157 product(bool, AllowParallelDefineClass, false, \ 1158 "Allow parallel defineClass requests for class loaders " \ 1159 "registering as parallel capable") \ 1160 \ 1161 product(bool, MustCallLoadClassInternal, false, \ 1162 "Call loadClassInternal() rather than loadClass()") \ 1163 \ 1164 product_pd(bool, DontYieldALot, \ 1165 "Throw away obvious excess yield calls") \ 1166 \ 1167 develop(bool, UseDetachedThreads, true, \ 1168 "Use detached threads that are recycled upon termination " \ 1169 "(for Solaris only)") \ 1170 \ 1171 product(bool, UseLWPSynchronization, true, \ 1172 "Use LWP-based instead of libthread-based synchronization " \ 1173 "(SPARC only)") \ 1174 \ 1175 experimental(ccstr, SyncKnobs, NULL, \ 1176 "(Unstable) Various monitor synchronization tunables") \ 1177 \ 1178 experimental(intx, EmitSync, 0, \ 1179 "(Unsafe, Unstable) " \ 1180 "Control emission of inline sync fast-path code") \ 1181 \ 1182 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1183 range(0, max_jint) \ 1184 \ 1185 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1186 \ 1187 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1188 "Experimental Sync flags") \ 1189 \ 1190 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1191 \ 1192 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1193 \ 1194 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1195 \ 1196 experimental(intx, hashCode, 5, \ 1197 "(Unstable) select hashCode generation algorithm") \ 1198 \ 1199 product(bool, FilterSpuriousWakeups, true, \ 1200 "When true prevents OS-level spurious, or premature, wakeups " \ 1201 "from Object.wait (Ignored for Windows)") \ 1202 \ 1203 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1204 \ 1205 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1206 \ 1207 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1208 \ 1209 develop(bool, UsePthreads, false, \ 1210 "Use pthread-based instead of libthread-based synchronization " \ 1211 "(SPARC only)") \ 1212 \ 1213 product(bool, ReduceSignalUsage, false, \ 1214 "Reduce the use of OS signals in Java and/or the VM") \ 1215 \ 1216 develop_pd(bool, ShareVtableStubs, \ 1217 "Share vtable stubs (smaller code but worse branch prediction") \ 1218 \ 1219 develop(bool, LoadLineNumberTables, true, \ 1220 "Tell whether the class file parser loads line number tables") \ 1221 \ 1222 develop(bool, LoadLocalVariableTables, true, \ 1223 "Tell whether the class file parser loads local variable tables") \ 1224 \ 1225 develop(bool, LoadLocalVariableTypeTables, true, \ 1226 "Tell whether the class file parser loads local variable type" \ 1227 "tables") \ 1228 \ 1229 product(bool, AllowUserSignalHandlers, false, \ 1230 "Do not complain if the application installs signal handlers " \ 1231 "(Solaris & Linux only)") \ 1232 \ 1233 product(bool, UseSignalChaining, true, \ 1234 "Use signal-chaining to invoke signal handlers installed " \ 1235 "by the application (Solaris & Linux only)") \ 1236 \ 1237 product(bool, AllowJNIEnvProxy, false, \ 1238 "Allow JNIEnv proxies for jdbx") \ 1239 \ 1240 product(bool, RestoreMXCSROnJNICalls, false, \ 1241 "Restore MXCSR when returning from JNI calls") \ 1242 \ 1243 product(bool, CheckJNICalls, false, \ 1244 "Verify all arguments to JNI calls") \ 1245 \ 1246 product(bool, CheckEndorsedAndExtDirs, false, \ 1247 "Verify the endorsed and extension directories are not used") \ 1248 \ 1249 product(bool, UseFastJNIAccessors, true, \ 1250 "Use optimized versions of Get<Primitive>Field") \ 1251 \ 1252 product(intx, MaxJNILocalCapacity, 65536, \ 1253 "Maximum allowable local JNI handle capacity to " \ 1254 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1255 "where <= 0 is unlimited, default: 65536") \ 1256 range(min_intx, max_intx) \ 1257 \ 1258 product(bool, EagerXrunInit, false, \ 1259 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1260 "but not all -Xrun libraries may support the state of the VM " \ 1261 "at this time") \ 1262 \ 1263 product(bool, PreserveAllAnnotations, false, \ 1264 "Preserve RuntimeInvisibleAnnotations as well " \ 1265 "as RuntimeVisibleAnnotations") \ 1266 \ 1267 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1268 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1269 \ 1270 product(bool, UseXMMForArrayCopy, false, \ 1271 "Use SSE2 MOVQ instruction for Arraycopy") \ 1272 \ 1273 product(intx, FieldsAllocationStyle, 1, \ 1274 "0 - type based with oops first, " \ 1275 "1 - with oops last, " \ 1276 "2 - oops in super and sub classes are together") \ 1277 range(0, 2) \ 1278 \ 1279 product(bool, CompactFields, true, \ 1280 "Allocate nonstatic fields in gaps between previous fields") \ 1281 \ 1282 notproduct(bool, PrintFieldLayout, false, \ 1283 "Print field layout for each class") \ 1284 \ 1285 /* Need to limit the extent of the padding to reasonable size. */\ 1286 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1287 /* aggressive prefetching, while still leaving the room for segregating */\ 1288 /* among the distinct pages. */\ 1289 product(intx, ContendedPaddingWidth, 128, \ 1290 "How many bytes to pad the fields/classes marked @Contended with")\ 1291 range(0, 8192) \ 1292 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1293 \ 1294 product(bool, EnableContended, true, \ 1295 "Enable @Contended annotation support") \ 1296 \ 1297 product(bool, RestrictContended, true, \ 1298 "Restrict @Contended to trusted classes") \ 1299 \ 1300 product(bool, UseBiasedLocking, true, \ 1301 "Enable biased locking in JVM") \ 1302 \ 1303 product(intx, BiasedLockingStartupDelay, 4000, \ 1304 "Number of milliseconds to wait before enabling biased locking") \ 1305 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1306 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1307 \ 1308 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1309 "Print statistics of biased locking in JVM") \ 1310 \ 1311 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1312 "Threshold of number of revocations per type to try to " \ 1313 "rebias all objects in the heap of that type") \ 1314 range(0, max_intx) \ 1315 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1316 \ 1317 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1318 "Threshold of number of revocations per type to permanently " \ 1319 "revoke biases of all objects in the heap of that type") \ 1320 range(0, max_intx) \ 1321 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1322 \ 1323 product(intx, BiasedLockingDecayTime, 25000, \ 1324 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1325 "type after previous bulk rebias") \ 1326 range(500, max_intx) \ 1327 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1328 \ 1329 product(bool, ExitOnOutOfMemoryError, false, \ 1330 "JVM exits on the first occurrence of an out-of-memory error") \ 1331 \ 1332 product(bool, CrashOnOutOfMemoryError, false, \ 1333 "JVM aborts, producing an error log and core/mini dump, on the " \ 1334 "first occurrence of an out-of-memory error") \ 1335 \ 1336 /* tracing */ \ 1337 \ 1338 develop(bool, StressRewriter, false, \ 1339 "Stress linktime bytecode rewriting") \ 1340 \ 1341 product(ccstr, TraceJVMTI, NULL, \ 1342 "Trace flags for JVMTI functions and events") \ 1343 \ 1344 /* This option can change an EMCP method into an obsolete method. */ \ 1345 /* This can affect tests that except specific methods to be EMCP. */ \ 1346 /* This option should be used with caution. */ \ 1347 product(bool, StressLdcRewrite, false, \ 1348 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1349 \ 1350 /* change to false by default sometime after Mustang */ \ 1351 product(bool, VerifyMergedCPBytecodes, true, \ 1352 "Verify bytecodes after RedefineClasses constant pool merging") \ 1353 \ 1354 develop(bool, TraceBytecodes, false, \ 1355 "Trace bytecode execution") \ 1356 \ 1357 develop(bool, TraceICs, false, \ 1358 "Trace inline cache changes") \ 1359 \ 1360 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1361 "Trace method invocation counter overflow") \ 1362 \ 1363 develop(bool, TraceInlineCacheClearing, false, \ 1364 "Trace clearing of inline caches in nmethods") \ 1365 \ 1366 develop(bool, TraceDependencies, false, \ 1367 "Trace dependencies") \ 1368 \ 1369 develop(bool, VerifyDependencies, trueInDebug, \ 1370 "Exercise and verify the compilation dependency mechanism") \ 1371 \ 1372 develop(bool, TraceNewOopMapGeneration, false, \ 1373 "Trace OopMapGeneration") \ 1374 \ 1375 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1376 "Trace OopMapGeneration: print detailed cell states") \ 1377 \ 1378 develop(bool, TimeOopMap, false, \ 1379 "Time calls to GenerateOopMap::compute_map() in sum") \ 1380 \ 1381 develop(bool, TimeOopMap2, false, \ 1382 "Time calls to GenerateOopMap::compute_map() individually") \ 1383 \ 1384 develop(bool, TraceOopMapRewrites, false, \ 1385 "Trace rewriting of method oops during oop map generation") \ 1386 \ 1387 develop(bool, TraceICBuffer, false, \ 1388 "Trace usage of IC buffer") \ 1389 \ 1390 develop(bool, TraceCompiledIC, false, \ 1391 "Trace changes of compiled IC") \ 1392 \ 1393 /* gc */ \ 1394 \ 1395 product(bool, UseSerialGC, false, \ 1396 "Use the Serial garbage collector") \ 1397 \ 1398 product(bool, UseG1GC, false, \ 1399 "Use the Garbage-First garbage collector") \ 1400 \ 1401 product(bool, UseParallelGC, false, \ 1402 "Use the Parallel Scavenge garbage collector") \ 1403 \ 1404 product(bool, UseParallelOldGC, false, \ 1405 "Use the Parallel Old garbage collector") \ 1406 \ 1407 product(uintx, HeapMaximumCompactionInterval, 20, \ 1408 "How often should we maximally compact the heap (not allowing " \ 1409 "any dead space)") \ 1410 range(0, max_uintx) \ 1411 \ 1412 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1413 "The collection count for the first maximum compaction") \ 1414 range(0, max_uintx) \ 1415 \ 1416 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1417 "Use maximum compaction in the Parallel Old garbage collector " \ 1418 "for a system GC") \ 1419 \ 1420 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1421 "The mean used by the parallel compact dead wood " \ 1422 "limiter (a number between 0-100)") \ 1423 range(0, 100) \ 1424 \ 1425 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1426 "The standard deviation used by the parallel compact dead wood " \ 1427 "limiter (a number between 0-100)") \ 1428 range(0, 100) \ 1429 \ 1430 product(uint, ParallelGCThreads, 0, \ 1431 "Number of parallel threads parallel gc will use") \ 1432 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1433 \ 1434 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1435 "Use semaphore synchronization for the GC Threads, " \ 1436 "instead of synchronization based on mutexes") \ 1437 \ 1438 product(bool, UseDynamicNumberOfGCThreads, false, \ 1439 "Dynamically choose the number of parallel threads " \ 1440 "parallel gc will use") \ 1441 \ 1442 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1443 "Inject thread creation failures for " \ 1444 "UseDynamicNumberOfGCThreads") \ 1445 \ 1446 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1447 "Force dynamic selection of the number of " \ 1448 "parallel threads parallel gc will use to aid debugging") \ 1449 \ 1450 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1451 "Size of heap (bytes) per GC thread used in calculating the " \ 1452 "number of GC threads") \ 1453 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1454 \ 1455 product(uint, ConcGCThreads, 0, \ 1456 "Number of threads concurrent gc will use") \ 1457 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1458 \ 1459 product(uint, GCTaskTimeStampEntries, 200, \ 1460 "Number of time stamp entries per gc worker thread") \ 1461 range(1, max_jint) \ 1462 \ 1463 product(bool, AlwaysTenure, false, \ 1464 "Always tenure objects in eden (ParallelGC only)") \ 1465 \ 1466 product(bool, NeverTenure, false, \ 1467 "Never tenure objects in eden, may tenure on overflow " \ 1468 "(ParallelGC only)") \ 1469 \ 1470 product(bool, ScavengeBeforeFullGC, true, \ 1471 "Scavenge youngest generation before each full GC.") \ 1472 \ 1473 product(bool, UseConcMarkSweepGC, false, \ 1474 "Use Concurrent Mark-Sweep GC in the old generation") \ 1475 \ 1476 product(bool, ExplicitGCInvokesConcurrent, false, \ 1477 "A System.gc() request invokes a concurrent collection; " \ 1478 "(effective only when using concurrent collectors)") \ 1479 \ 1480 product(bool, GCLockerInvokesConcurrent, false, \ 1481 "The exit of a JNI critical section necessitating a scavenge, " \ 1482 "also kicks off a background concurrent collection") \ 1483 \ 1484 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1485 "How much the GC can expand the eden by while the GC locker " \ 1486 "is active (as a percentage)") \ 1487 range(0, 100) \ 1488 \ 1489 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1490 "Number of times to retry allocations when " \ 1491 "blocked by the GC locker") \ 1492 range(0, max_uintx) \ 1493 \ 1494 product(bool, UseCMSBestFit, true, \ 1495 "Use CMS best fit allocation strategy") \ 1496 \ 1497 product(uintx, ParallelGCBufferWastePct, 10, \ 1498 "Wasted fraction of parallel allocation buffer") \ 1499 range(0, 100) \ 1500 \ 1501 product(uintx, TargetPLABWastePct, 10, \ 1502 "Target wasted space in last buffer as percent of overall " \ 1503 "allocation") \ 1504 range(1, 100) \ 1505 \ 1506 product(uintx, PLABWeight, 75, \ 1507 "Percentage (0-100) used to weight the current sample when " \ 1508 "computing exponentially decaying average for ResizePLAB") \ 1509 range(0, 100) \ 1510 \ 1511 product(bool, ResizePLAB, true, \ 1512 "Dynamically resize (survivor space) promotion LAB's") \ 1513 \ 1514 product(int, ParGCArrayScanChunk, 50, \ 1515 "Scan a subset of object array and push remainder, if array is " \ 1516 "bigger than this") \ 1517 range(1, max_jint/3) \ 1518 \ 1519 product(bool, ParGCUseLocalOverflow, false, \ 1520 "Instead of a global overflow list, use local overflow stacks") \ 1521 \ 1522 product(bool, ParGCTrimOverflow, true, \ 1523 "Eagerly trim the local overflow lists " \ 1524 "(when ParGCUseLocalOverflow)") \ 1525 \ 1526 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1527 "Simulate work queue overflow in ParNew") \ 1528 \ 1529 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1530 "An `interval' counter that determines how frequently " \ 1531 "we simulate overflow; a smaller number increases frequency") \ 1532 \ 1533 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1534 "The desired number of objects to claim from the overflow list") \ 1535 range(0, max_uintx) \ 1536 \ 1537 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1538 "The number of strides per worker thread that we divide up the " \ 1539 "card table scanning work into") \ 1540 range(1, max_uintx) \ 1541 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1542 \ 1543 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1544 "The number of cards in each chunk of the parallel chunks used " \ 1545 "during card table scanning") \ 1546 range(1, max_intx) \ 1547 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1548 \ 1549 product(uintx, OldPLABWeight, 50, \ 1550 "Percentage (0-100) used to weight the current sample when " \ 1551 "computing exponentially decaying average for resizing " \ 1552 "OldPLABSize") \ 1553 range(0, 100) \ 1554 \ 1555 product(bool, ResizeOldPLAB, true, \ 1556 "Dynamically resize (old gen) promotion LAB's") \ 1557 \ 1558 product(size_t, CMSOldPLABMax, 1024, \ 1559 "Maximum size of CMS gen promotion LAB caches per worker " \ 1560 "per block size") \ 1561 range(1, max_uintx) \ 1562 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1563 \ 1564 product(size_t, CMSOldPLABMin, 16, \ 1565 "Minimum size of CMS gen promotion LAB caches per worker " \ 1566 "per block size") \ 1567 range(1, max_uintx) \ 1568 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1569 \ 1570 product(uintx, CMSOldPLABNumRefills, 4, \ 1571 "Nominal number of refills of CMS gen promotion LAB cache " \ 1572 "per worker per block size") \ 1573 range(1, max_uintx) \ 1574 \ 1575 product(bool, CMSOldPLABResizeQuicker, false, \ 1576 "React on-the-fly during a scavenge to a sudden " \ 1577 "change in block demand rate") \ 1578 \ 1579 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1580 "The tolerance of the phase-change detector for on-the-fly " \ 1581 "PLAB resizing during a scavenge") \ 1582 range(1, max_uintx) \ 1583 \ 1584 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1585 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1586 "during a scavenge") \ 1587 range(1, max_uintx) \ 1588 \ 1589 product(bool, AlwaysPreTouch, false, \ 1590 "Force all freshly committed pages to be pre-touched") \ 1591 \ 1592 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1593 "Per-thread chunk size for parallel memory pre-touch.") \ 1594 range(1, SIZE_MAX / 2) \ 1595 \ 1596 product_pd(size_t, CMSYoungGenPerWorker, \ 1597 "The maximum size of young gen chosen by default per GC worker " \ 1598 "thread available") \ 1599 range(1, max_uintx) \ 1600 \ 1601 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1602 "Percentage (0-100) used to add conservatism when computing the " \ 1603 "duty cycle") \ 1604 range(0, 100) \ 1605 \ 1606 product(uintx, CMSExpAvgFactor, 50, \ 1607 "Percentage (0-100) used to weight the current sample when " \ 1608 "computing exponential averages for CMS statistics") \ 1609 range(0, 100) \ 1610 \ 1611 product(uintx, CMS_FLSWeight, 75, \ 1612 "Percentage (0-100) used to weight the current sample when " \ 1613 "computing exponentially decaying averages for CMS FLS " \ 1614 "statistics") \ 1615 range(0, 100) \ 1616 \ 1617 product(uintx, CMS_FLSPadding, 1, \ 1618 "The multiple of deviation from mean to use for buffering " \ 1619 "against volatility in free list demand") \ 1620 range(0, max_juint) \ 1621 \ 1622 product(uintx, FLSCoalescePolicy, 2, \ 1623 "CMS: aggressiveness level for coalescing, increasing " \ 1624 "from 0 to 4") \ 1625 range(0, 4) \ 1626 \ 1627 product(bool, FLSAlwaysCoalesceLarge, false, \ 1628 "CMS: larger free blocks are always available for coalescing") \ 1629 \ 1630 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1631 "CMS: the smaller the percentage the greater the coalescing " \ 1632 "force") \ 1633 range(0.0, 1.0) \ 1634 \ 1635 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1636 "CMS: the factor by which to inflate estimated demand of small " \ 1637 "block sizes to prevent coalescing with an adjoining block") \ 1638 range(0.0, DBL_MAX) \ 1639 \ 1640 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1641 "CMS: the factor by which to inflate estimated demand of large " \ 1642 "block sizes to prevent coalescing with an adjoining block") \ 1643 range(0.0, DBL_MAX) \ 1644 \ 1645 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1646 "CMS: the factor by which to inflate estimated demand of small " \ 1647 "block sizes to prevent splitting to supply demand for smaller " \ 1648 "blocks") \ 1649 range(0.0, DBL_MAX) \ 1650 \ 1651 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1652 "CMS: the factor by which to inflate estimated demand of large " \ 1653 "block sizes to prevent splitting to supply demand for smaller " \ 1654 "blocks") \ 1655 range(0.0, DBL_MAX) \ 1656 \ 1657 product(bool, CMSExtrapolateSweep, false, \ 1658 "CMS: cushion for block demand during sweep") \ 1659 \ 1660 product(uintx, CMS_SweepWeight, 75, \ 1661 "Percentage (0-100) used to weight the current sample when " \ 1662 "computing exponentially decaying average for inter-sweep " \ 1663 "duration") \ 1664 range(0, 100) \ 1665 \ 1666 product(uintx, CMS_SweepPadding, 1, \ 1667 "The multiple of deviation from mean to use for buffering " \ 1668 "against volatility in inter-sweep duration") \ 1669 range(0, max_juint) \ 1670 \ 1671 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1672 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1673 "duration exceeds this threshold in milliseconds") \ 1674 range(0, max_uintx) \ 1675 \ 1676 product(bool, CMSClassUnloadingEnabled, true, \ 1677 "Whether class unloading enabled when using CMS GC") \ 1678 \ 1679 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1680 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1681 "count for which classes may not be unloaded") \ 1682 range(0, max_uintx) \ 1683 \ 1684 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1685 "Replenish an indexed free list with this number of chunks") \ 1686 range(1, max_uintx) \ 1687 \ 1688 product(bool, CMSReplenishIntermediate, true, \ 1689 "Replenish all intermediate free-list caches") \ 1690 \ 1691 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1692 "When satisfying batched demand, split blocks from the " \ 1693 "IndexedFreeList whose size is a multiple of requested size") \ 1694 \ 1695 product(bool, CMSLoopWarn, false, \ 1696 "Warn in case of excessive CMS looping") \ 1697 \ 1698 /* where does the range max value of (max_jint - 1) come from? */ \ 1699 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1700 "Maximum size of marking stack") \ 1701 range(1, (max_jint - 1)) \ 1702 \ 1703 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1704 "Size of marking stack") \ 1705 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1706 \ 1707 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1708 "Simulate frequent marking stack / work queue overflow") \ 1709 \ 1710 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1711 "An \"interval\" counter that determines how frequently " \ 1712 "to simulate overflow; a smaller number increases frequency") \ 1713 \ 1714 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1715 "Maximum number of abortable preclean iterations, if > 0") \ 1716 range(0, max_uintx) \ 1717 \ 1718 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1719 "Maximum time in abortable preclean (in milliseconds)") \ 1720 range(0, max_intx) \ 1721 \ 1722 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1723 "Nominal minimum work per abortable preclean iteration") \ 1724 range(0, max_uintx) \ 1725 \ 1726 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1727 "Time that we sleep between iterations when not given " \ 1728 "enough work per iteration") \ 1729 range(0, max_intx) \ 1730 \ 1731 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1732 product(size_t, CMSRescanMultiple, 32, \ 1733 "Size (in cards) of CMS parallel rescan task") \ 1734 range(1, SIZE_MAX / 4096) \ 1735 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1736 \ 1737 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1738 product(size_t, CMSConcMarkMultiple, 32, \ 1739 "Size (in cards) of CMS concurrent MT marking task") \ 1740 range(1, SIZE_MAX / 4096) \ 1741 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1742 \ 1743 product(bool, CMSAbortSemantics, false, \ 1744 "Whether abort-on-overflow semantics is implemented") \ 1745 \ 1746 product(bool, CMSParallelInitialMarkEnabled, true, \ 1747 "Use the parallel initial mark.") \ 1748 \ 1749 product(bool, CMSParallelRemarkEnabled, true, \ 1750 "Whether parallel remark enabled (only if ParNewGC)") \ 1751 \ 1752 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1753 "Whether parallel remark of survivor space " \ 1754 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1755 \ 1756 product(bool, CMSPLABRecordAlways, true, \ 1757 "Always record survivor space PLAB boundaries (effective only " \ 1758 "if CMSParallelSurvivorRemarkEnabled)") \ 1759 \ 1760 product(bool, CMSEdenChunksRecordAlways, true, \ 1761 "Always record eden chunks used for the parallel initial mark " \ 1762 "or remark of eden") \ 1763 \ 1764 product(bool, CMSConcurrentMTEnabled, true, \ 1765 "Whether multi-threaded concurrent work enabled " \ 1766 "(effective only if ParNewGC)") \ 1767 \ 1768 product(bool, CMSPrecleaningEnabled, true, \ 1769 "Whether concurrent precleaning enabled") \ 1770 \ 1771 product(uintx, CMSPrecleanIter, 3, \ 1772 "Maximum number of precleaning iteration passes") \ 1773 range(0, 9) \ 1774 \ 1775 product(uintx, CMSPrecleanDenominator, 3, \ 1776 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1777 "ratio") \ 1778 range(1, max_uintx) \ 1779 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1780 \ 1781 product(uintx, CMSPrecleanNumerator, 2, \ 1782 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1783 "ratio") \ 1784 range(0, max_uintx-1) \ 1785 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1786 \ 1787 product(bool, CMSPrecleanRefLists1, true, \ 1788 "Preclean ref lists during (initial) preclean phase") \ 1789 \ 1790 product(bool, CMSPrecleanRefLists2, false, \ 1791 "Preclean ref lists during abortable preclean phase") \ 1792 \ 1793 product(bool, CMSPrecleanSurvivors1, false, \ 1794 "Preclean survivors during (initial) preclean phase") \ 1795 \ 1796 product(bool, CMSPrecleanSurvivors2, true, \ 1797 "Preclean survivors during abortable preclean phase") \ 1798 \ 1799 product(uintx, CMSPrecleanThreshold, 1000, \ 1800 "Do not iterate again if number of dirty cards is less than this")\ 1801 range(100, max_uintx) \ 1802 \ 1803 product(bool, CMSCleanOnEnter, true, \ 1804 "Clean-on-enter optimization for reducing number of dirty cards") \ 1805 \ 1806 product(uintx, CMSRemarkVerifyVariant, 1, \ 1807 "Choose variant (1,2) of verification following remark") \ 1808 range(1, 2) \ 1809 \ 1810 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1811 "If Eden size is below this, do not try to schedule remark") \ 1812 range(0, max_uintx) \ 1813 \ 1814 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1815 "The Eden occupancy percentage (0-100) at which " \ 1816 "to try and schedule remark pause") \ 1817 range(0, 100) \ 1818 \ 1819 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1820 "Start sampling eden top at least before young gen " \ 1821 "occupancy reaches 1/<ratio> of the size at which " \ 1822 "we plan to schedule remark") \ 1823 range(1, max_uintx) \ 1824 \ 1825 product(uintx, CMSSamplingGrain, 16*K, \ 1826 "The minimum distance between eden samples for CMS (see above)") \ 1827 range(ObjectAlignmentInBytes, max_uintx) \ 1828 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1829 \ 1830 product(bool, CMSScavengeBeforeRemark, false, \ 1831 "Attempt scavenge before the CMS remark step") \ 1832 \ 1833 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1834 "Don't drain below this size per parallel worker/thief") \ 1835 range(1, max_juint) \ 1836 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1837 \ 1838 manageable(intx, CMSWaitDuration, 2000, \ 1839 "Time in milliseconds that CMS thread waits for young GC") \ 1840 range(min_jint, max_jint) \ 1841 \ 1842 develop(uintx, CMSCheckInterval, 1000, \ 1843 "Interval in milliseconds that CMS thread checks if it " \ 1844 "should start a collection cycle") \ 1845 \ 1846 product(bool, CMSYield, true, \ 1847 "Yield between steps of CMS") \ 1848 \ 1849 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1850 "Bitmap operations should process at most this many bits " \ 1851 "between yields") \ 1852 range(1, max_uintx) \ 1853 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1854 \ 1855 product(bool, CMSPrintChunksInDump, false, \ 1856 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1857 "trace level include more detailed information about the" \ 1858 "free chunks") \ 1859 \ 1860 product(bool, CMSPrintObjectsInDump, false, \ 1861 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1862 "trace level include more detailed information about the" \ 1863 "allocated objects") \ 1864 \ 1865 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1866 "Verify that all references across the FLS boundary " \ 1867 "are to valid objects") \ 1868 \ 1869 diagnostic(bool, FLSVerifyLists, false, \ 1870 "Do lots of (expensive) FreeListSpace verification") \ 1871 \ 1872 diagnostic(bool, FLSVerifyIndexTable, false, \ 1873 "Do lots of (expensive) FLS index table verification") \ 1874 \ 1875 develop(bool, FLSVerifyDictionary, false, \ 1876 "Do lots of (expensive) FLS dictionary verification") \ 1877 \ 1878 develop(bool, VerifyBlockOffsetArray, false, \ 1879 "Do (expensive) block offset array verification") \ 1880 \ 1881 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1882 "Maintain _unallocated_block in BlockOffsetArray " \ 1883 "(currently applicable only to CMS collector)") \ 1884 \ 1885 product(intx, RefDiscoveryPolicy, 0, \ 1886 "Select type of reference discovery policy: " \ 1887 "reference-based(0) or referent-based(1)") \ 1888 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1889 ReferenceProcessor::DiscoveryPolicyMax) \ 1890 \ 1891 product(bool, ParallelRefProcEnabled, false, \ 1892 "Enable parallel reference processing whenever possible") \ 1893 \ 1894 product(bool, ParallelRefProcBalancingEnabled, true, \ 1895 "Enable balancing of reference processing queues") \ 1896 \ 1897 product(uintx, CMSTriggerRatio, 80, \ 1898 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1899 "allocated before a CMS collection cycle commences") \ 1900 range(0, 100) \ 1901 \ 1902 product(uintx, CMSBootstrapOccupancy, 50, \ 1903 "Percentage CMS generation occupancy at which to " \ 1904 "initiate CMS collection for bootstrapping collection stats") \ 1905 range(0, 100) \ 1906 \ 1907 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1908 "Percentage CMS generation occupancy to start a CMS collection " \ 1909 "cycle. A negative value means that CMSTriggerRatio is used") \ 1910 range(min_intx, 100) \ 1911 \ 1912 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1913 "The percent occupancy (IHOP) of the current old generation " \ 1914 "capacity above which a concurrent mark cycle will be initiated " \ 1915 "Its value may change over time if adaptive IHOP is enabled, " \ 1916 "otherwise the value remains constant. " \ 1917 "In the latter case a value of 0 will result as frequent as " \ 1918 "possible concurrent marking cycles. A value of 100 disables " \ 1919 "concurrent marking. " \ 1920 "Fragmentation waste in the old generation is not considered " \ 1921 "free space in this calculation. (G1 collector only)") \ 1922 range(0, 100) \ 1923 \ 1924 manageable(intx, CMSTriggerInterval, -1, \ 1925 "Commence a CMS collection cycle (at least) every so many " \ 1926 "milliseconds (0 permanently, -1 disabled)") \ 1927 range(-1, max_intx) \ 1928 \ 1929 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1930 "Only use occupancy as a criterion for starting a CMS collection")\ 1931 \ 1932 product(uintx, CMSIsTooFullPercentage, 98, \ 1933 "An absolute ceiling above which CMS will always consider the " \ 1934 "unloading of classes when class unloading is enabled") \ 1935 range(0, 100) \ 1936 \ 1937 develop(bool, CMSTestInFreeList, false, \ 1938 "Check if the coalesced range is already in the " \ 1939 "free lists as claimed") \ 1940 \ 1941 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1942 "Check that all the garbage collected was returned to the " \ 1943 "free lists") \ 1944 \ 1945 notproduct(bool, ScavengeALot, false, \ 1946 "Force scavenge at every Nth exit from the runtime system " \ 1947 "(N=ScavengeALotInterval)") \ 1948 \ 1949 develop(bool, FullGCALot, false, \ 1950 "Force full gc at every Nth exit from the runtime system " \ 1951 "(N=FullGCALotInterval)") \ 1952 \ 1953 notproduct(bool, GCALotAtAllSafepoints, false, \ 1954 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1955 \ 1956 notproduct(bool, PromotionFailureALot, false, \ 1957 "Use promotion failure handling on every youngest generation " \ 1958 "collection") \ 1959 \ 1960 develop(uintx, PromotionFailureALotCount, 1000, \ 1961 "Number of promotion failures occurring at PLAB " \ 1962 "refill attempts (ParNew) or promotion attempts " \ 1963 "(other young collectors)") \ 1964 \ 1965 develop(uintx, PromotionFailureALotInterval, 5, \ 1966 "Total collections between promotion failures a lot") \ 1967 \ 1968 experimental(uintx, WorkStealingSleepMillis, 1, \ 1969 "Sleep time when sleep is used for yields") \ 1970 \ 1971 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1972 "Number of yields before a sleep is done during work stealing") \ 1973 \ 1974 experimental(uintx, WorkStealingHardSpins, 4096, \ 1975 "Number of iterations in a spin loop between checks on " \ 1976 "time out of hard spin") \ 1977 \ 1978 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1979 "Ratio of hard spins to calls to yield") \ 1980 \ 1981 develop(uintx, ObjArrayMarkingStride, 2048, \ 1982 "Number of object array elements to push onto the marking stack " \ 1983 "before pushing a continuation entry") \ 1984 \ 1985 develop(bool, MetadataAllocationFailALot, false, \ 1986 "Fail metadata allocations at intervals controlled by " \ 1987 "MetadataAllocationFailALotInterval") \ 1988 \ 1989 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1990 "Metadata allocation failure a lot interval") \ 1991 \ 1992 notproduct(bool, ExecuteInternalVMTests, false, \ 1993 "Enable execution of internal VM tests") \ 1994 \ 1995 notproduct(bool, VerboseInternalVMTests, false, \ 1996 "Turn on logging for internal VM tests.") \ 1997 \ 1998 product(bool, ExecutingUnitTests, false, \ 1999 "Whether the JVM is running unit tests or not") \ 2000 \ 2001 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2002 \ 2003 product_pd(bool, ResizeTLAB, \ 2004 "Dynamically resize TLAB size for threads") \ 2005 \ 2006 product(bool, ZeroTLAB, false, \ 2007 "Zero out the newly created TLAB") \ 2008 \ 2009 product(bool, FastTLABRefill, true, \ 2010 "Use fast TLAB refill code") \ 2011 \ 2012 product(bool, TLABStats, true, \ 2013 "Provide more detailed and expensive TLAB statistics.") \ 2014 \ 2015 product_pd(bool, NeverActAsServerClassMachine, \ 2016 "Never act like a server-class machine") \ 2017 \ 2018 product(bool, AlwaysActAsServerClassMachine, false, \ 2019 "Always act like a server-class machine") \ 2020 \ 2021 product_pd(uint64_t, MaxRAM, \ 2022 "Real memory size (in bytes) used to set maximum heap size") \ 2023 range(0, 0XFFFFFFFFFFFFFFFF) \ 2024 \ 2025 product(size_t, ErgoHeapSizeLimit, 0, \ 2026 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2027 "MaxRAM / MaxRAMFraction") \ 2028 range(0, max_uintx) \ 2029 \ 2030 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2031 "Use CGroup memory limit as physical memory limit for heap " \ 2032 "sizing") \ 2033 \ 2034 product(uintx, MaxRAMFraction, 4, \ 2035 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2036 "size") \ 2037 range(1, max_uintx) \ 2038 \ 2039 product(uintx, MinRAMFraction, 2, \ 2040 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2041 "size on systems with small physical memory size") \ 2042 range(1, max_uintx) \ 2043 \ 2044 product(uintx, InitialRAMFraction, 64, \ 2045 "Fraction (1/n) of real memory used for initial heap size") \ 2046 range(1, max_uintx) \ 2047 \ 2048 develop(uintx, MaxVirtMemFraction, 2, \ 2049 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2050 "determining maximum heap size") \ 2051 \ 2052 product(bool, UseAdaptiveSizePolicy, true, \ 2053 "Use adaptive generation sizing policies") \ 2054 \ 2055 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2056 "Use adaptive survivor sizing policies") \ 2057 \ 2058 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2059 "Use adaptive young-old sizing policies at minor collections") \ 2060 \ 2061 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2062 "Use adaptive young-old sizing policies at major collections") \ 2063 \ 2064 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2065 "Include statistics from System.gc() for adaptive size policy") \ 2066 \ 2067 product(bool, UseAdaptiveGCBoundary, false, \ 2068 "Allow young-old boundary to move") \ 2069 \ 2070 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2071 "Resize the virtual spaces of the young or old generations") \ 2072 range(-1, 1) \ 2073 \ 2074 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2075 "Policy for changing generation size for throughput goals") \ 2076 range(0, 1) \ 2077 \ 2078 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2079 "Number of steps where heuristics is used before data is used") \ 2080 range(0, max_uintx) \ 2081 \ 2082 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2083 "Number of collections before the adaptive sizing is started") \ 2084 \ 2085 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2086 "Collection interval for printing information; zero means never") \ 2087 range(0, max_uintx) \ 2088 \ 2089 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2090 "Use adaptive minimum footprint as a goal") \ 2091 \ 2092 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2093 "Weight given to exponential resizing, between 0 and 100") \ 2094 range(0, 100) \ 2095 \ 2096 product(uintx, AdaptiveTimeWeight, 25, \ 2097 "Weight given to time in adaptive policy, between 0 and 100") \ 2098 range(0, 100) \ 2099 \ 2100 product(uintx, PausePadding, 1, \ 2101 "How much buffer to keep for pause time") \ 2102 range(0, max_juint) \ 2103 \ 2104 product(uintx, PromotedPadding, 3, \ 2105 "How much buffer to keep for promotion failure") \ 2106 range(0, max_juint) \ 2107 \ 2108 product(uintx, SurvivorPadding, 3, \ 2109 "How much buffer to keep for survivor overflow") \ 2110 range(0, max_juint) \ 2111 \ 2112 product(uintx, ThresholdTolerance, 10, \ 2113 "Allowed collection cost difference between generations") \ 2114 range(0, 100) \ 2115 \ 2116 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2117 "If collection costs are within margin, reduce both by full " \ 2118 "delta") \ 2119 range(0, 100) \ 2120 \ 2121 product(uintx, YoungGenerationSizeIncrement, 20, \ 2122 "Adaptive size percentage change in young generation") \ 2123 range(0, 100) \ 2124 \ 2125 product(uintx, YoungGenerationSizeSupplement, 80, \ 2126 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2127 range(0, 100) \ 2128 \ 2129 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2130 "Decay factor to YoungedGenerationSizeSupplement") \ 2131 range(1, max_uintx) \ 2132 \ 2133 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2134 "Adaptive size percentage change in tenured generation") \ 2135 range(0, 100) \ 2136 \ 2137 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2138 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2139 range(0, 100) \ 2140 \ 2141 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2142 "Decay factor to TenuredGenerationSizeIncrement") \ 2143 range(1, max_uintx) \ 2144 \ 2145 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2146 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2147 "or (G1 Only) the maximum GC time per MMU time slice") \ 2148 range(1, max_uintx - 1) \ 2149 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2150 \ 2151 product(uintx, GCPauseIntervalMillis, 0, \ 2152 "Time slice for MMU specification") \ 2153 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2154 \ 2155 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2156 "Adaptive size policy maximum GC minor pause time goal " \ 2157 "in millisecond") \ 2158 range(0, max_uintx) \ 2159 \ 2160 product(uintx, GCTimeRatio, 99, \ 2161 "Adaptive size policy application time to GC time ratio") \ 2162 range(0, max_juint) \ 2163 \ 2164 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2165 "Adaptive size scale down factor for shrinking") \ 2166 range(1, max_uintx) \ 2167 \ 2168 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2169 "Adaptive size decays the major cost for long major intervals") \ 2170 \ 2171 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2172 "Time scale over which major costs decay") \ 2173 range(0, max_uintx) \ 2174 \ 2175 product(uintx, MinSurvivorRatio, 3, \ 2176 "Minimum ratio of young generation/survivor space size") \ 2177 range(3, max_uintx) \ 2178 \ 2179 product(uintx, InitialSurvivorRatio, 8, \ 2180 "Initial ratio of young generation/survivor space size") \ 2181 range(0, max_uintx) \ 2182 \ 2183 product(size_t, BaseFootPrintEstimate, 256*M, \ 2184 "Estimate of footprint other than Java Heap") \ 2185 range(0, max_uintx) \ 2186 \ 2187 product(bool, UseGCOverheadLimit, true, \ 2188 "Use policy to limit of proportion of time spent in GC " \ 2189 "before an OutOfMemory error is thrown") \ 2190 \ 2191 product(uintx, GCTimeLimit, 98, \ 2192 "Limit of the proportion of time spent in GC before " \ 2193 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2194 range(0, 100) \ 2195 \ 2196 product(uintx, GCHeapFreeLimit, 2, \ 2197 "Minimum percentage of free space after a full GC before an " \ 2198 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2199 range(0, 100) \ 2200 \ 2201 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2202 "Number of consecutive collections before gc time limit fires") \ 2203 range(1, max_uintx) \ 2204 \ 2205 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2206 "How far ahead to prefetch destination area (<= 0 means off)") \ 2207 range(-1, max_jint) \ 2208 \ 2209 product(intx, PrefetchScanIntervalInBytes, -1, \ 2210 "How far ahead to prefetch scan area (<= 0 means off)") \ 2211 range(-1, max_jint) \ 2212 \ 2213 product(intx, PrefetchFieldsAhead, -1, \ 2214 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2215 range(-1, max_jint) \ 2216 \ 2217 diagnostic(bool, VerifyDuringStartup, false, \ 2218 "Verify memory system before executing any Java code " \ 2219 "during VM initialization") \ 2220 \ 2221 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2222 "Verify system before exiting") \ 2223 \ 2224 diagnostic(bool, VerifyBeforeGC, false, \ 2225 "Verify memory system before GC") \ 2226 \ 2227 diagnostic(bool, VerifyAfterGC, false, \ 2228 "Verify memory system after GC") \ 2229 \ 2230 diagnostic(bool, VerifyDuringGC, false, \ 2231 "Verify memory system during GC (between phases)") \ 2232 \ 2233 diagnostic(ccstrlist, VerifySubSet, "", \ 2234 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2235 "are enabled. One or more sub-systems can be specified " \ 2236 "in a comma separated string. Sub-systems are: " \ 2237 "threads, heap, symbol_table, string_table, codecache, " \ 2238 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2239 "codecache_oops") \ 2240 \ 2241 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2242 "Enable parallel memory system verification") \ 2243 \ 2244 diagnostic(bool, DeferInitialCardMark, false, \ 2245 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2246 "may arise from new_pre_store_barrier") \ 2247 \ 2248 product(bool, UseCondCardMark, false, \ 2249 "Check for already marked card before updating card table") \ 2250 \ 2251 diagnostic(bool, VerifyRememberedSets, false, \ 2252 "Verify GC remembered sets") \ 2253 \ 2254 diagnostic(bool, VerifyObjectStartArray, true, \ 2255 "Verify GC object start array if verify before/after") \ 2256 \ 2257 product(bool, DisableExplicitGC, false, \ 2258 "Ignore calls to System.gc()") \ 2259 \ 2260 notproduct(bool, CheckMemoryInitialization, false, \ 2261 "Check memory initialization") \ 2262 \ 2263 diagnostic(bool, BindCMSThreadToCPU, false, \ 2264 "Bind CMS Thread to CPU if possible") \ 2265 \ 2266 diagnostic(uintx, CPUForCMSThread, 0, \ 2267 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2268 range(0, max_juint) \ 2269 \ 2270 product(bool, BindGCTaskThreadsToCPUs, false, \ 2271 "Bind GCTaskThreads to CPUs if possible") \ 2272 \ 2273 product(bool, UseGCTaskAffinity, false, \ 2274 "Use worker affinity when asking for GCTasks") \ 2275 \ 2276 product(uintx, ProcessDistributionStride, 4, \ 2277 "Stride through processors when distributing processes") \ 2278 range(0, max_juint) \ 2279 \ 2280 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2281 "Number of times the coordinator GC thread will sleep while " \ 2282 "yielding before giving up and resuming GC") \ 2283 range(0, max_juint) \ 2284 \ 2285 product(uintx, CMSYieldSleepCount, 0, \ 2286 "Number of times a GC thread (minus the coordinator) " \ 2287 "will sleep while yielding before giving up and resuming GC") \ 2288 range(0, max_juint) \ 2289 \ 2290 product(bool, PrintGC, false, \ 2291 "Print message at garbage collection. " \ 2292 "Deprecated, use -Xlog:gc instead.") \ 2293 \ 2294 product(bool, PrintGCDetails, false, \ 2295 "Print more details at garbage collection. " \ 2296 "Deprecated, use -Xlog:gc* instead.") \ 2297 \ 2298 develop(intx, ConcGCYieldTimeout, 0, \ 2299 "If non-zero, assert that GC threads yield within this " \ 2300 "number of milliseconds") \ 2301 range(0, max_intx) \ 2302 \ 2303 develop(bool, TraceFinalizerRegistration, false, \ 2304 "Trace registration of final references") \ 2305 \ 2306 notproduct(bool, TraceScavenge, false, \ 2307 "Trace scavenge") \ 2308 \ 2309 product(bool, IgnoreEmptyClassPaths, false, \ 2310 "Ignore empty path elements in -classpath") \ 2311 \ 2312 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2313 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2314 "Initial size of the boot class loader data metaspace") \ 2315 range(30*K, max_uintx/BytesPerWord) \ 2316 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2317 \ 2318 product(bool, TraceYoungGenTime, false, \ 2319 "Trace accumulated time for young collection") \ 2320 \ 2321 product(bool, TraceOldGenTime, false, \ 2322 "Trace accumulated time for old collection") \ 2323 \ 2324 product(bool, PrintHeapAtSIGBREAK, true, \ 2325 "Print heap layout in response to SIGBREAK") \ 2326 \ 2327 manageable(bool, PrintClassHistogram, false, \ 2328 "Print a histogram of class instances") \ 2329 \ 2330 develop(bool, TraceGCTaskManager, false, \ 2331 "Trace actions of the GC task manager") \ 2332 \ 2333 develop(bool, TraceGCTaskQueue, false, \ 2334 "Trace actions of the GC task queues") \ 2335 \ 2336 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2337 "Trace marking phase in ParallelOldGC") \ 2338 \ 2339 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2340 "Trace dense prefix computation for ParallelOldGC") \ 2341 \ 2342 develop(bool, IgnoreLibthreadGPFault, false, \ 2343 "Suppress workaround for libthread GP fault") \ 2344 \ 2345 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2346 "The percentage of the used heap that the instances of a class " \ 2347 "must occupy for the class to generate a trace event") \ 2348 range(0.0, 100.0) \ 2349 \ 2350 /* JVMTI heap profiling */ \ 2351 \ 2352 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2353 "Trace JVMTI object tagging calls") \ 2354 \ 2355 diagnostic(bool, VerifyBeforeIteration, false, \ 2356 "Verify memory system before JVMTI iteration") \ 2357 \ 2358 /* compiler interface */ \ 2359 \ 2360 develop(bool, CIPrintCompilerName, false, \ 2361 "when CIPrint is active, print the name of the active compiler") \ 2362 \ 2363 diagnostic(bool, CIPrintCompileQueue, false, \ 2364 "display the contents of the compile queue whenever a " \ 2365 "compilation is enqueued") \ 2366 \ 2367 develop(bool, CIPrintRequests, false, \ 2368 "display every request for compilation") \ 2369 \ 2370 product(bool, CITime, false, \ 2371 "collect timing information for compilation") \ 2372 \ 2373 develop(bool, CITimeVerbose, false, \ 2374 "be more verbose in compilation timings") \ 2375 \ 2376 develop(bool, CITimeEach, false, \ 2377 "display timing information after each successful compilation") \ 2378 \ 2379 develop(bool, CICountOSR, false, \ 2380 "use a separate counter when assigning ids to osr compilations") \ 2381 \ 2382 develop(bool, CICompileNatives, true, \ 2383 "compile native methods if supported by the compiler") \ 2384 \ 2385 develop_pd(bool, CICompileOSR, \ 2386 "compile on stack replacement methods if supported by the " \ 2387 "compiler") \ 2388 \ 2389 develop(bool, CIPrintMethodCodes, false, \ 2390 "print method bytecodes of the compiled code") \ 2391 \ 2392 develop(bool, CIPrintTypeFlow, false, \ 2393 "print the results of ciTypeFlow analysis") \ 2394 \ 2395 develop(bool, CITraceTypeFlow, false, \ 2396 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2397 \ 2398 develop(intx, OSROnlyBCI, -1, \ 2399 "OSR only at this bci. Negative values mean exclude that bci") \ 2400 \ 2401 /* compiler */ \ 2402 \ 2403 /* notice: the max range value here is max_jint, not max_intx */ \ 2404 /* because of overflow issue */ \ 2405 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2406 "Number of compiler threads to run") \ 2407 range(0, max_jint) \ 2408 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2409 \ 2410 product(intx, CompilationPolicyChoice, 0, \ 2411 "which compilation policy (0-3)") \ 2412 range(0, 3) \ 2413 \ 2414 develop(bool, UseStackBanging, true, \ 2415 "use stack banging for stack overflow checks (required for " \ 2416 "proper StackOverflow handling; disable only to measure cost " \ 2417 "of stackbanging)") \ 2418 \ 2419 develop(bool, UseStrictFP, true, \ 2420 "use strict fp if modifier strictfp is set") \ 2421 \ 2422 develop(bool, GenerateSynchronizationCode, true, \ 2423 "generate locking/unlocking code for synchronized methods and " \ 2424 "monitors") \ 2425 \ 2426 develop(bool, GenerateRangeChecks, true, \ 2427 "Generate range checks for array accesses") \ 2428 \ 2429 diagnostic_pd(bool, ImplicitNullChecks, \ 2430 "Generate code for implicit null checks") \ 2431 \ 2432 product_pd(bool, TrapBasedNullChecks, \ 2433 "Generate code for null checks that uses a cmp and trap " \ 2434 "instruction raising SIGTRAP. This is only used if an access to" \ 2435 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2436 "ImplicitNullChecks don't work (PPC64).") \ 2437 \ 2438 product(bool, PrintSafepointStatistics, false, \ 2439 "Print statistics about safepoint synchronization") \ 2440 \ 2441 product(intx, PrintSafepointStatisticsCount, 300, \ 2442 "Total number of safepoint statistics collected " \ 2443 "before printing them out") \ 2444 range(1, max_intx) \ 2445 \ 2446 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2447 "Print safepoint statistics only when safepoint takes " \ 2448 "more than PrintSafepointSatisticsTimeout in millis") \ 2449 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2450 NOT_LP64(range(-1, max_intx)) \ 2451 \ 2452 product(bool, Inline, true, \ 2453 "Enable inlining") \ 2454 \ 2455 product(bool, ClipInlining, true, \ 2456 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2457 \ 2458 develop(bool, UseCHA, true, \ 2459 "Enable CHA") \ 2460 \ 2461 product(bool, UseTypeProfile, true, \ 2462 "Check interpreter profile for historically monomorphic calls") \ 2463 \ 2464 diagnostic(bool, PrintInlining, false, \ 2465 "Print inlining optimizations") \ 2466 \ 2467 product(bool, UsePopCountInstruction, false, \ 2468 "Use population count instruction") \ 2469 \ 2470 develop(bool, EagerInitialization, false, \ 2471 "Eagerly initialize classes if possible") \ 2472 \ 2473 diagnostic(bool, LogTouchedMethods, false, \ 2474 "Log methods which have been ever touched in runtime") \ 2475 \ 2476 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2477 "Print all methods that have been ever touched in runtime") \ 2478 \ 2479 develop(bool, TraceMethodReplacement, false, \ 2480 "Print when methods are replaced do to recompilation") \ 2481 \ 2482 develop(bool, PrintMethodFlushing, false, \ 2483 "Print the nmethods being flushed") \ 2484 \ 2485 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2486 "print statistics about method flushing") \ 2487 \ 2488 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2489 "Number of compiled code invocations after which " \ 2490 "the method is considered as hot by the flusher") \ 2491 range(1, max_jint) \ 2492 \ 2493 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2494 "Minimum number of sweeper passes before an nmethod " \ 2495 "can be flushed") \ 2496 range(0, max_intx) \ 2497 \ 2498 product(bool, UseCodeAging, true, \ 2499 "Insert counter to detect warm methods") \ 2500 \ 2501 diagnostic(bool, StressCodeAging, false, \ 2502 "Start with counters compiled in") \ 2503 \ 2504 develop(bool, UseRelocIndex, false, \ 2505 "Use an index to speed random access to relocations") \ 2506 \ 2507 develop(bool, StressCodeBuffers, false, \ 2508 "Exercise code buffer expansion and other rare state changes") \ 2509 \ 2510 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2511 "Generate extra debugging information for non-safepoints in " \ 2512 "nmethods") \ 2513 \ 2514 product(bool, PrintVMOptions, false, \ 2515 "Print flags that appeared on the command line") \ 2516 \ 2517 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2518 "Ignore unrecognized VM options") \ 2519 \ 2520 product(bool, PrintCommandLineFlags, false, \ 2521 "Print flags specified on command line or set by ergonomics") \ 2522 \ 2523 product(bool, PrintFlagsInitial, false, \ 2524 "Print all VM flags before argument processing and exit VM") \ 2525 \ 2526 product(bool, PrintFlagsFinal, false, \ 2527 "Print all VM flags after argument and ergonomic processing") \ 2528 \ 2529 notproduct(bool, PrintFlagsWithComments, false, \ 2530 "Print all VM flags with default values and descriptions and " \ 2531 "exit") \ 2532 \ 2533 product(bool, PrintFlagsRanges, false, \ 2534 "Print VM flags and their ranges and exit VM") \ 2535 \ 2536 diagnostic(bool, SerializeVMOutput, true, \ 2537 "Use a mutex to serialize output to tty and LogFile") \ 2538 \ 2539 diagnostic(bool, DisplayVMOutput, true, \ 2540 "Display all VM output on the tty, independently of LogVMOutput") \ 2541 \ 2542 diagnostic(bool, LogVMOutput, false, \ 2543 "Save VM output to LogFile") \ 2544 \ 2545 diagnostic(ccstr, LogFile, NULL, \ 2546 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2547 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2548 \ 2549 product(ccstr, ErrorFile, NULL, \ 2550 "If an error occurs, save the error data to this file " \ 2551 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2552 \ 2553 product(bool, DisplayVMOutputToStderr, false, \ 2554 "If DisplayVMOutput is true, display all VM output to stderr") \ 2555 \ 2556 product(bool, DisplayVMOutputToStdout, false, \ 2557 "If DisplayVMOutput is true, display all VM output to stdout") \ 2558 \ 2559 product(bool, UseHeavyMonitors, false, \ 2560 "use heavyweight instead of lightweight Java monitors") \ 2561 \ 2562 product(bool, PrintStringTableStatistics, false, \ 2563 "print statistics about the StringTable and SymbolTable") \ 2564 \ 2565 diagnostic(bool, VerifyStringTableAtExit, false, \ 2566 "verify StringTable contents at exit") \ 2567 \ 2568 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2569 "print histogram of the symbol table") \ 2570 \ 2571 notproduct(bool, ExitVMOnVerifyError, false, \ 2572 "standard exit from VM if bytecode verify error " \ 2573 "(only in debug mode)") \ 2574 \ 2575 diagnostic(ccstr, AbortVMOnException, NULL, \ 2576 "Call fatal if this exception is thrown. Example: " \ 2577 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2578 \ 2579 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2580 "Call fatal if the exception pointed by AbortVMOnException " \ 2581 "has this message") \ 2582 \ 2583 develop(bool, DebugVtables, false, \ 2584 "add debugging code to vtable dispatch") \ 2585 \ 2586 notproduct(bool, PrintVtableStats, false, \ 2587 "print vtables stats at end of run") \ 2588 \ 2589 develop(bool, TraceCreateZombies, false, \ 2590 "trace creation of zombie nmethods") \ 2591 \ 2592 notproduct(bool, IgnoreLockingAssertions, false, \ 2593 "disable locking assertions (for speed)") \ 2594 \ 2595 product(bool, RangeCheckElimination, true, \ 2596 "Eliminate range checks") \ 2597 \ 2598 develop_pd(bool, UncommonNullCast, \ 2599 "track occurrences of null in casts; adjust compiler tactics") \ 2600 \ 2601 develop(bool, TypeProfileCasts, true, \ 2602 "treat casts like calls for purposes of type profiling") \ 2603 \ 2604 develop(bool, DelayCompilationDuringStartup, true, \ 2605 "Delay invoking the compiler until main application class is " \ 2606 "loaded") \ 2607 \ 2608 develop(bool, CompileTheWorld, false, \ 2609 "Compile all methods in all classes in bootstrap class path " \ 2610 "(stress test)") \ 2611 \ 2612 develop(bool, CompileTheWorldPreloadClasses, true, \ 2613 "Preload all classes used by a class before start loading") \ 2614 \ 2615 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2616 "Force a safepoint every n compiles so sweeper can keep up") \ 2617 \ 2618 develop(bool, FillDelaySlots, true, \ 2619 "Fill delay slots (on SPARC only)") \ 2620 \ 2621 develop(bool, TimeLivenessAnalysis, false, \ 2622 "Time computation of bytecode liveness analysis") \ 2623 \ 2624 develop(bool, TraceLivenessGen, false, \ 2625 "Trace the generation of liveness analysis information") \ 2626 \ 2627 notproduct(bool, TraceLivenessQuery, false, \ 2628 "Trace queries of liveness analysis information") \ 2629 \ 2630 notproduct(bool, CollectIndexSetStatistics, false, \ 2631 "Collect information about IndexSets") \ 2632 \ 2633 develop(bool, UseLoopSafepoints, true, \ 2634 "Generate Safepoint nodes in every loop") \ 2635 \ 2636 develop(intx, FastAllocateSizeLimit, 128*K, \ 2637 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2638 "Inline allocations larger than this in doublewords must go slow")\ 2639 \ 2640 product(bool, AggressiveOpts, false, \ 2641 "Enable aggressive optimizations - see arguments.cpp") \ 2642 \ 2643 product_pd(bool, CompactStrings, \ 2644 "Enable Strings to use single byte chars in backing store") \ 2645 \ 2646 product_pd(uintx, TypeProfileLevel, \ 2647 "=XYZ, with Z: Type profiling of arguments at call; " \ 2648 "Y: Type profiling of return value at call; " \ 2649 "X: Type profiling of parameters to methods; " \ 2650 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2651 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2652 \ 2653 product(intx, TypeProfileArgsLimit, 2, \ 2654 "max number of call arguments to consider for type profiling") \ 2655 range(0, 16) \ 2656 \ 2657 product(intx, TypeProfileParmsLimit, 2, \ 2658 "max number of incoming parameters to consider for type profiling"\ 2659 ", -1 for all") \ 2660 range(-1, 64) \ 2661 \ 2662 /* statistics */ \ 2663 develop(bool, CountCompiledCalls, false, \ 2664 "Count method invocations") \ 2665 \ 2666 notproduct(bool, CountRuntimeCalls, false, \ 2667 "Count VM runtime calls") \ 2668 \ 2669 develop(bool, CountJNICalls, false, \ 2670 "Count jni method invocations") \ 2671 \ 2672 notproduct(bool, CountJVMCalls, false, \ 2673 "Count jvm method invocations") \ 2674 \ 2675 notproduct(bool, CountRemovableExceptions, false, \ 2676 "Count exceptions that could be replaced by branches due to " \ 2677 "inlining") \ 2678 \ 2679 notproduct(bool, ICMissHistogram, false, \ 2680 "Produce histogram of IC misses") \ 2681 \ 2682 /* interpreter */ \ 2683 product_pd(bool, RewriteBytecodes, \ 2684 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2685 \ 2686 product_pd(bool, RewriteFrequentPairs, \ 2687 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2688 \ 2689 diagnostic(bool, PrintInterpreter, false, \ 2690 "Print the generated interpreter code") \ 2691 \ 2692 product(bool, UseInterpreter, true, \ 2693 "Use interpreter for non-compiled methods") \ 2694 \ 2695 develop(bool, UseFastSignatureHandlers, true, \ 2696 "Use fast signature handlers for native calls") \ 2697 \ 2698 product(bool, UseLoopCounter, true, \ 2699 "Increment invocation counter on backward branch") \ 2700 \ 2701 product_pd(bool, UseOnStackReplacement, \ 2702 "Use on stack replacement, calls runtime if invoc. counter " \ 2703 "overflows in loop") \ 2704 \ 2705 notproduct(bool, TraceOnStackReplacement, false, \ 2706 "Trace on stack replacement") \ 2707 \ 2708 product_pd(bool, PreferInterpreterNativeStubs, \ 2709 "Use always interpreter stubs for native methods invoked via " \ 2710 "interpreter") \ 2711 \ 2712 develop(bool, CountBytecodes, false, \ 2713 "Count number of bytecodes executed") \ 2714 \ 2715 develop(bool, PrintBytecodeHistogram, false, \ 2716 "Print histogram of the executed bytecodes") \ 2717 \ 2718 develop(bool, PrintBytecodePairHistogram, false, \ 2719 "Print histogram of the executed bytecode pairs") \ 2720 \ 2721 diagnostic(bool, PrintSignatureHandlers, false, \ 2722 "Print code generated for native method signature handlers") \ 2723 \ 2724 develop(bool, VerifyOops, false, \ 2725 "Do plausibility checks for oops") \ 2726 \ 2727 develop(bool, CheckUnhandledOops, false, \ 2728 "Check for unhandled oops in VM code") \ 2729 \ 2730 develop(bool, VerifyJNIFields, trueInDebug, \ 2731 "Verify jfieldIDs for instance fields") \ 2732 \ 2733 notproduct(bool, VerifyJNIEnvThread, false, \ 2734 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2735 "from JNI") \ 2736 \ 2737 develop(bool, VerifyFPU, false, \ 2738 "Verify FPU state (check for NaN's, etc.)") \ 2739 \ 2740 develop(bool, VerifyThread, false, \ 2741 "Watch the thread register for corruption (SPARC only)") \ 2742 \ 2743 develop(bool, VerifyActivationFrameSize, false, \ 2744 "Verify that activation frame didn't become smaller than its " \ 2745 "minimal size") \ 2746 \ 2747 develop(bool, TraceFrequencyInlining, false, \ 2748 "Trace frequency based inlining") \ 2749 \ 2750 develop_pd(bool, InlineIntrinsics, \ 2751 "Inline intrinsics that can be statically resolved") \ 2752 \ 2753 product_pd(bool, ProfileInterpreter, \ 2754 "Profile at the bytecode level during interpretation") \ 2755 \ 2756 develop(bool, TraceProfileInterpreter, false, \ 2757 "Trace profiling at the bytecode level during interpretation. " \ 2758 "This outputs the profiling information collected to improve " \ 2759 "jit compilation.") \ 2760 \ 2761 develop_pd(bool, ProfileTraps, \ 2762 "Profile deoptimization traps at the bytecode level") \ 2763 \ 2764 product(intx, ProfileMaturityPercentage, 20, \ 2765 "number of method invocations/branches (expressed as % of " \ 2766 "CompileThreshold) before using the method's profile") \ 2767 range(0, 100) \ 2768 \ 2769 diagnostic(bool, PrintMethodData, false, \ 2770 "Print the results of +ProfileInterpreter at end of run") \ 2771 \ 2772 develop(bool, VerifyDataPointer, trueInDebug, \ 2773 "Verify the method data pointer during interpreter profiling") \ 2774 \ 2775 develop(bool, VerifyCompiledCode, false, \ 2776 "Include miscellaneous runtime verifications in nmethod code; " \ 2777 "default off because it disturbs nmethod size heuristics") \ 2778 \ 2779 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2780 "Manually make GC thread crash then dump java stack trace; " \ 2781 "Test only") \ 2782 \ 2783 /* compilation */ \ 2784 product(bool, UseCompiler, true, \ 2785 "Use Just-In-Time compilation") \ 2786 \ 2787 develop(bool, TraceCompilationPolicy, false, \ 2788 "Trace compilation policy") \ 2789 \ 2790 develop(bool, TimeCompilationPolicy, false, \ 2791 "Time the compilation policy") \ 2792 \ 2793 product(bool, UseCounterDecay, true, \ 2794 "Adjust recompilation counters") \ 2795 \ 2796 develop(intx, CounterHalfLifeTime, 30, \ 2797 "Half-life time of invocation counters (in seconds)") \ 2798 \ 2799 develop(intx, CounterDecayMinIntervalLength, 500, \ 2800 "The minimum interval (in milliseconds) between invocation of " \ 2801 "CounterDecay") \ 2802 \ 2803 product(bool, AlwaysCompileLoopMethods, false, \ 2804 "When using recompilation, never interpret methods " \ 2805 "containing loops") \ 2806 \ 2807 product(bool, DontCompileHugeMethods, true, \ 2808 "Do not compile methods > HugeMethodLimit") \ 2809 \ 2810 /* Bytecode escape analysis estimation. */ \ 2811 product(bool, EstimateArgEscape, true, \ 2812 "Analyze bytecodes to estimate escape state of arguments") \ 2813 \ 2814 product(intx, BCEATraceLevel, 0, \ 2815 "How much tracing to do of bytecode escape analysis estimates " \ 2816 "(0-3)") \ 2817 range(0, 3) \ 2818 \ 2819 product(intx, MaxBCEAEstimateLevel, 5, \ 2820 "Maximum number of nested calls that are analyzed by BC EA") \ 2821 range(0, max_jint) \ 2822 \ 2823 product(intx, MaxBCEAEstimateSize, 150, \ 2824 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2825 range(0, max_jint) \ 2826 \ 2827 product(intx, AllocatePrefetchStyle, 1, \ 2828 "0 = no prefetch, " \ 2829 "1 = generate prefetch instructions for each allocation, " \ 2830 "2 = use TLAB watermark to gate allocation prefetch, " \ 2831 "3 = generate one prefetch instruction per cache line") \ 2832 range(0, 3) \ 2833 \ 2834 product(intx, AllocatePrefetchDistance, -1, \ 2835 "Distance to prefetch ahead of allocation pointer. " \ 2836 "-1: use system-specific value (automatically determined") \ 2837 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2838 \ 2839 product(intx, AllocatePrefetchLines, 3, \ 2840 "Number of lines to prefetch ahead of array allocation pointer") \ 2841 range(1, 64) \ 2842 \ 2843 product(intx, AllocateInstancePrefetchLines, 1, \ 2844 "Number of lines to prefetch ahead of instance allocation " \ 2845 "pointer") \ 2846 range(1, 64) \ 2847 \ 2848 product(intx, AllocatePrefetchStepSize, 16, \ 2849 "Step size in bytes of sequential prefetch instructions") \ 2850 range(1, 512) \ 2851 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2852 \ 2853 product(intx, AllocatePrefetchInstr, 0, \ 2854 "Select instruction to prefetch ahead of allocation pointer") \ 2855 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2856 \ 2857 /* deoptimization */ \ 2858 develop(bool, TraceDeoptimization, false, \ 2859 "Trace deoptimization") \ 2860 \ 2861 develop(bool, PrintDeoptimizationDetails, false, \ 2862 "Print more information about deoptimization") \ 2863 \ 2864 develop(bool, DebugDeoptimization, false, \ 2865 "Tracing various information while debugging deoptimization") \ 2866 \ 2867 product(intx, SelfDestructTimer, 0, \ 2868 "Will cause VM to terminate after a given time (in minutes) " \ 2869 "(0 means off)") \ 2870 range(0, max_intx) \ 2871 \ 2872 product(intx, MaxJavaStackTraceDepth, 1024, \ 2873 "The maximum number of lines in the stack trace for Java " \ 2874 "exceptions (0 means all)") \ 2875 range(0, max_jint/2) \ 2876 \ 2877 /* notice: the max range value here is max_jint, not max_intx */ \ 2878 /* because of overflow issue */ \ 2879 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2880 "Guarantee a safepoint (at least) every so many milliseconds " \ 2881 "(0 means none)") \ 2882 range(0, max_jint) \ 2883 \ 2884 product(intx, SafepointTimeoutDelay, 10000, \ 2885 "Delay in milliseconds for option SafepointTimeout") \ 2886 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2887 NOT_LP64(range(0, max_intx)) \ 2888 \ 2889 product(intx, NmethodSweepActivity, 10, \ 2890 "Removes cold nmethods from code cache if > 0. Higher values " \ 2891 "result in more aggressive sweeping") \ 2892 range(0, 2000) \ 2893 \ 2894 notproduct(bool, LogSweeper, false, \ 2895 "Keep a ring buffer of sweeper activity") \ 2896 \ 2897 notproduct(intx, SweeperLogEntries, 1024, \ 2898 "Number of records in the ring buffer of sweeper activity") \ 2899 \ 2900 notproduct(intx, MemProfilingInterval, 500, \ 2901 "Time between each invocation of the MemProfiler") \ 2902 \ 2903 develop(intx, MallocCatchPtr, -1, \ 2904 "Hit breakpoint when mallocing/freeing this pointer") \ 2905 \ 2906 notproduct(ccstrlist, SuppressErrorAt, "", \ 2907 "List of assertions (file:line) to muzzle") \ 2908 \ 2909 develop(intx, StackPrintLimit, 100, \ 2910 "number of stack frames to print in VM-level stack dump") \ 2911 \ 2912 notproduct(intx, MaxElementPrintSize, 256, \ 2913 "maximum number of elements to print") \ 2914 \ 2915 notproduct(intx, MaxSubklassPrintSize, 4, \ 2916 "maximum number of subklasses to print when printing klass") \ 2917 \ 2918 product(intx, MaxInlineLevel, 9, \ 2919 "maximum number of nested calls that are inlined") \ 2920 range(0, max_jint) \ 2921 \ 2922 product(intx, MaxRecursiveInlineLevel, 1, \ 2923 "maximum number of nested recursive calls that are inlined") \ 2924 range(0, max_jint) \ 2925 \ 2926 develop(intx, MaxForceInlineLevel, 100, \ 2927 "maximum number of nested calls that are forced for inlining " \ 2928 "(using CompileCommand or marked w/ @ForceInline)") \ 2929 range(0, max_jint) \ 2930 \ 2931 product_pd(intx, InlineSmallCode, \ 2932 "Only inline already compiled methods if their code size is " \ 2933 "less than this") \ 2934 range(0, max_jint) \ 2935 \ 2936 product(intx, MaxInlineSize, 35, \ 2937 "The maximum bytecode size of a method to be inlined") \ 2938 range(0, max_jint) \ 2939 \ 2940 product_pd(intx, FreqInlineSize, \ 2941 "The maximum bytecode size of a frequent method to be inlined") \ 2942 range(0, max_jint) \ 2943 \ 2944 product(intx, MaxTrivialSize, 6, \ 2945 "The maximum bytecode size of a trivial method to be inlined") \ 2946 range(0, max_jint) \ 2947 \ 2948 product(intx, MinInliningThreshold, 250, \ 2949 "The minimum invocation count a method needs to have to be " \ 2950 "inlined") \ 2951 range(0, max_jint) \ 2952 \ 2953 develop(intx, MethodHistogramCutoff, 100, \ 2954 "The cutoff value for method invocation histogram (+CountCalls)") \ 2955 \ 2956 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2957 "Number of interpreted methods to show in profile") \ 2958 \ 2959 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2960 "Number of compiled methods to show in profile") \ 2961 \ 2962 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2963 "Number of stub methods to show in profile") \ 2964 \ 2965 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2966 "Number of runtime stub nodes to show in profile") \ 2967 \ 2968 product(intx, ProfileIntervalsTicks, 100, \ 2969 "Number of ticks between printing of interval profile " \ 2970 "(+ProfileIntervals)") \ 2971 range(0, max_intx) \ 2972 \ 2973 notproduct(intx, ScavengeALotInterval, 1, \ 2974 "Interval between which scavenge will occur with +ScavengeALot") \ 2975 \ 2976 notproduct(intx, FullGCALotInterval, 1, \ 2977 "Interval between which full gc will occur with +FullGCALot") \ 2978 \ 2979 notproduct(intx, FullGCALotStart, 0, \ 2980 "For which invocation to start FullGCAlot") \ 2981 \ 2982 notproduct(intx, FullGCALotDummies, 32*K, \ 2983 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2984 "to move") \ 2985 \ 2986 develop(intx, DontYieldALotInterval, 10, \ 2987 "Interval between which yields will be dropped (milliseconds)") \ 2988 \ 2989 develop(intx, ProfilerPCTickThreshold, 15, \ 2990 "Number of ticks in a PC buckets to be a hotspot") \ 2991 \ 2992 notproduct(intx, DeoptimizeALotInterval, 5, \ 2993 "Number of exits until DeoptimizeALot kicks in") \ 2994 \ 2995 notproduct(intx, ZombieALotInterval, 5, \ 2996 "Number of exits until ZombieALot kicks in") \ 2997 \ 2998 diagnostic(uintx, MallocMaxTestWords, 0, \ 2999 "If non-zero, maximum number of words that malloc/realloc can " \ 3000 "allocate (for testing only)") \ 3001 range(0, max_uintx) \ 3002 \ 3003 product(intx, TypeProfileWidth, 2, \ 3004 "Number of receiver types to record in call/cast profile") \ 3005 range(0, 8) \ 3006 \ 3007 develop(intx, BciProfileWidth, 2, \ 3008 "Number of return bci's to record in ret profile") \ 3009 \ 3010 product(intx, PerMethodRecompilationCutoff, 400, \ 3011 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3012 range(-1, max_intx) \ 3013 \ 3014 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3015 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3016 range(-1, max_intx) \ 3017 \ 3018 product(intx, PerMethodTrapLimit, 100, \ 3019 "Limit on traps (of one kind) in a method (includes inlines)") \ 3020 range(0, max_jint) \ 3021 \ 3022 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3023 "Limit on speculative traps (of one kind) in a method " \ 3024 "(includes inlines)") \ 3025 range(0, max_jint) \ 3026 \ 3027 product(intx, PerBytecodeTrapLimit, 4, \ 3028 "Limit on traps (of one kind) at a particular BCI") \ 3029 range(0, max_jint) \ 3030 \ 3031 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3032 "Extra method data trap entries for speculation") \ 3033 \ 3034 develop(intx, InlineFrequencyRatio, 20, \ 3035 "Ratio of call site execution to caller method invocation") \ 3036 range(0, max_jint) \ 3037 \ 3038 diagnostic_pd(intx, InlineFrequencyCount, \ 3039 "Count of call site execution necessary to trigger frequent " \ 3040 "inlining") \ 3041 range(0, max_jint) \ 3042 \ 3043 develop(intx, InlineThrowCount, 50, \ 3044 "Force inlining of interpreted methods that throw this often") \ 3045 range(0, max_jint) \ 3046 \ 3047 develop(intx, InlineThrowMaxSize, 200, \ 3048 "Force inlining of throwing methods smaller than this") \ 3049 range(0, max_jint) \ 3050 \ 3051 develop(intx, ProfilerNodeSize, 1024, \ 3052 "Size in K to allocate for the Profile Nodes of each thread") \ 3053 range(0, 1024) \ 3054 \ 3055 /* gc parameters */ \ 3056 product(size_t, InitialHeapSize, 0, \ 3057 "Initial heap size (in bytes); zero means use ergonomics") \ 3058 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3059 \ 3060 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3061 "Maximum heap size (in bytes)") \ 3062 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3063 \ 3064 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3065 "Initial tenured generation size (in bytes)") \ 3066 range(0, max_uintx) \ 3067 \ 3068 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3069 "Initial new generation size (in bytes)") \ 3070 constraint(NewSizeConstraintFunc,AfterErgo) \ 3071 \ 3072 product(size_t, MaxNewSize, max_uintx, \ 3073 "Maximum new generation size (in bytes), max_uintx means set " \ 3074 "ergonomically") \ 3075 range(0, max_uintx) \ 3076 \ 3077 product_pd(size_t, HeapBaseMinAddress, \ 3078 "OS specific low limit for heap base address") \ 3079 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3080 \ 3081 product(size_t, PretenureSizeThreshold, 0, \ 3082 "Maximum size in bytes of objects allocated in DefNew " \ 3083 "generation; zero means no maximum") \ 3084 range(0, max_uintx) \ 3085 \ 3086 product(size_t, MinTLABSize, 2*K, \ 3087 "Minimum allowed TLAB size (in bytes)") \ 3088 range(1, max_uintx/2) \ 3089 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3090 \ 3091 product(size_t, TLABSize, 0, \ 3092 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3093 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3094 \ 3095 product(size_t, YoungPLABSize, 4096, \ 3096 "Size of young gen promotion LAB's (in HeapWords)") \ 3097 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3098 \ 3099 product(size_t, OldPLABSize, 1024, \ 3100 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3101 "of blocks to attempt to claim when refilling CMS LAB's") \ 3102 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3103 \ 3104 product(uintx, TLABAllocationWeight, 35, \ 3105 "Allocation averaging weight") \ 3106 range(0, 100) \ 3107 \ 3108 /* Limit the lower bound of this flag to 1 as it is used */ \ 3109 /* in a division expression. */ \ 3110 product(uintx, TLABWasteTargetPercent, 1, \ 3111 "Percentage of Eden that can be wasted") \ 3112 range(1, 100) \ 3113 \ 3114 product(uintx, TLABRefillWasteFraction, 64, \ 3115 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3116 range(1, max_juint) \ 3117 \ 3118 product(uintx, TLABWasteIncrement, 4, \ 3119 "Increment allowed waste at slow allocation") \ 3120 range(0, max_jint) \ 3121 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3122 \ 3123 product(uintx, SurvivorRatio, 8, \ 3124 "Ratio of eden/survivor space size") \ 3125 range(1, max_uintx-2) \ 3126 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3127 \ 3128 product(uintx, NewRatio, 2, \ 3129 "Ratio of old/new generation sizes") \ 3130 range(0, max_uintx-1) \ 3131 \ 3132 product_pd(size_t, NewSizeThreadIncrease, \ 3133 "Additional size added to desired new generation size per " \ 3134 "non-daemon thread (in bytes)") \ 3135 range(0, max_uintx) \ 3136 \ 3137 product_pd(size_t, MetaspaceSize, \ 3138 "Initial threshold (in bytes) at which a garbage collection " \ 3139 "is done to reduce Metaspace usage") \ 3140 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3141 \ 3142 product(size_t, MaxMetaspaceSize, max_uintx, \ 3143 "Maximum size of Metaspaces (in bytes)") \ 3144 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3145 \ 3146 product(size_t, CompressedClassSpaceSize, 1*G, \ 3147 "Maximum size of class area in Metaspace when compressed " \ 3148 "class pointers are used") \ 3149 range(1*M, 3*G) \ 3150 \ 3151 manageable(uintx, MinHeapFreeRatio, 40, \ 3152 "The minimum percentage of heap free after GC to avoid expansion."\ 3153 " For most GCs this applies to the old generation. In G1 and" \ 3154 " ParallelGC it applies to the whole heap.") \ 3155 range(0, 100) \ 3156 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3157 \ 3158 manageable(uintx, MaxHeapFreeRatio, 70, \ 3159 "The maximum percentage of heap free after GC to avoid shrinking."\ 3160 " For most GCs this applies to the old generation. In G1 and" \ 3161 " ParallelGC it applies to the whole heap.") \ 3162 range(0, 100) \ 3163 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3164 \ 3165 product(bool, ShrinkHeapInSteps, true, \ 3166 "When disabled, informs the GC to shrink the java heap directly" \ 3167 " to the target size at the next full GC rather than requiring" \ 3168 " smaller steps during multiple full GCs.") \ 3169 \ 3170 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3171 "Number of milliseconds per MB of free space in the heap") \ 3172 range(0, max_intx) \ 3173 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3174 \ 3175 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3176 "The minimum change in heap space due to GC (in bytes)") \ 3177 range(0, max_uintx) \ 3178 \ 3179 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3180 "The minimum expansion of Metaspace (in bytes)") \ 3181 range(0, max_uintx) \ 3182 \ 3183 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3184 "The maximum percentage of Metaspace free after GC to avoid " \ 3185 "shrinking") \ 3186 range(0, 100) \ 3187 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3188 \ 3189 product(uintx, MinMetaspaceFreeRatio, 40, \ 3190 "The minimum percentage of Metaspace free after GC to avoid " \ 3191 "expansion") \ 3192 range(0, 99) \ 3193 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3194 \ 3195 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3196 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3197 range(0, max_uintx) \ 3198 \ 3199 product(uintx, QueuedAllocationWarningCount, 0, \ 3200 "Number of times an allocation that queues behind a GC " \ 3201 "will retry before printing a warning") \ 3202 range(0, max_uintx) \ 3203 \ 3204 diagnostic(uintx, VerifyGCStartAt, 0, \ 3205 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3206 range(0, max_uintx) \ 3207 \ 3208 diagnostic(intx, VerifyGCLevel, 0, \ 3209 "Generation level at which to start +VerifyBefore/AfterGC") \ 3210 range(0, 1) \ 3211 \ 3212 product(uintx, MaxTenuringThreshold, 15, \ 3213 "Maximum value for tenuring threshold") \ 3214 range(0, markOopDesc::max_age + 1) \ 3215 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3216 \ 3217 product(uintx, InitialTenuringThreshold, 7, \ 3218 "Initial value for tenuring threshold") \ 3219 range(0, markOopDesc::max_age + 1) \ 3220 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3221 \ 3222 product(uintx, TargetSurvivorRatio, 50, \ 3223 "Desired percentage of survivor space used after scavenge") \ 3224 range(0, 100) \ 3225 \ 3226 product(uintx, MarkSweepDeadRatio, 5, \ 3227 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3228 "Serial mark sweep treats this as both the minimum and maximum " \ 3229 "value. " \ 3230 "CMS uses this value only if it falls back to mark sweep. " \ 3231 "Par compact uses a variable scale based on the density of the " \ 3232 "generation and treats this as the maximum value when the heap " \ 3233 "is either completely full or completely empty. Par compact " \ 3234 "also has a smaller default value; see arguments.cpp.") \ 3235 range(0, 100) \ 3236 \ 3237 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3238 "How often should we fully compact the heap (ignoring the dead " \ 3239 "space parameters)") \ 3240 range(1, max_juint) \ 3241 \ 3242 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3243 "Delay between expansion and allocation (in milliseconds)") \ 3244 \ 3245 develop(uintx, GCWorkerDelayMillis, 0, \ 3246 "Delay in scheduling GC workers (in milliseconds)") \ 3247 \ 3248 product(intx, DeferThrSuspendLoopCount, 4000, \ 3249 "(Unstable) Number of times to iterate in safepoint loop " \ 3250 "before blocking VM threads ") \ 3251 range(-1, max_jint-1) \ 3252 \ 3253 product(intx, DeferPollingPageLoopCount, -1, \ 3254 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3255 "before changing safepoint polling page to RO ") \ 3256 range(-1, max_jint-1) \ 3257 \ 3258 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3259 range(0, max_intx) \ 3260 \ 3261 product(bool, PSChunkLargeArrays, true, \ 3262 "Process large arrays in chunks") \ 3263 \ 3264 product(uintx, GCDrainStackTargetSize, 64, \ 3265 "Number of entries we will try to leave on the stack " \ 3266 "during parallel gc") \ 3267 range(0, max_juint) \ 3268 \ 3269 /* stack parameters */ \ 3270 product_pd(intx, StackYellowPages, \ 3271 "Number of yellow zone (recoverable overflows) pages of size " \ 3272 "4KB. If pages are bigger yellow zone is aligned up.") \ 3273 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3274 \ 3275 product_pd(intx, StackRedPages, \ 3276 "Number of red zone (unrecoverable overflows) pages of size " \ 3277 "4KB. If pages are bigger red zone is aligned up.") \ 3278 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3279 \ 3280 product_pd(intx, StackReservedPages, \ 3281 "Number of reserved zone (reserved to annotated methods) pages" \ 3282 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3283 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3284 \ 3285 product(bool, RestrictReservedStack, true, \ 3286 "Restrict @ReservedStackAccess to trusted classes") \ 3287 \ 3288 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3289 product_pd(intx, StackShadowPages, \ 3290 "Number of shadow zone (for overflow checking) pages of size " \ 3291 "4KB. If pages are bigger shadow zone is aligned up. " \ 3292 "This should exceed the depth of the VM and native call stack.") \ 3293 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3294 \ 3295 product_pd(intx, ThreadStackSize, \ 3296 "Thread Stack Size (in Kbytes)") \ 3297 range(0, (max_intx-os::vm_page_size())/(1 * K)) \ 3298 \ 3299 product_pd(intx, VMThreadStackSize, \ 3300 "Non-Java Thread Stack Size (in Kbytes)") \ 3301 range(0, max_intx/(1 * K)) \ 3302 \ 3303 product_pd(intx, CompilerThreadStackSize, \ 3304 "Compiler Thread Stack Size (in Kbytes)") \ 3305 range(0, max_intx/(1 * K)) \ 3306 \ 3307 develop_pd(size_t, JVMInvokeMethodSlack, \ 3308 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3309 \ 3310 /* code cache parameters */ \ 3311 develop_pd(uintx, CodeCacheSegmentSize, \ 3312 "Code cache segment size (in bytes) - smallest unit of " \ 3313 "allocation") \ 3314 range(1, 1024) \ 3315 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3316 \ 3317 develop_pd(intx, CodeEntryAlignment, \ 3318 "Code entry alignment for generated code (in bytes)") \ 3319 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3320 \ 3321 product_pd(intx, OptoLoopAlignment, \ 3322 "Align inner loops to zero relative to this modulus") \ 3323 range(1, 16) \ 3324 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3325 \ 3326 product_pd(uintx, InitialCodeCacheSize, \ 3327 "Initial code cache size (in bytes)") \ 3328 range(0, max_uintx) \ 3329 \ 3330 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3331 "Minimum code cache size (in bytes) required to start VM.") \ 3332 range(0, max_uintx) \ 3333 \ 3334 product(bool, SegmentedCodeCache, false, \ 3335 "Use a segmented code cache") \ 3336 \ 3337 product_pd(uintx, ReservedCodeCacheSize, \ 3338 "Reserved code cache size (in bytes) - maximum code cache size") \ 3339 range(0, max_uintx) \ 3340 \ 3341 product_pd(uintx, NonProfiledCodeHeapSize, \ 3342 "Size of code heap with non-profiled methods (in bytes)") \ 3343 range(0, max_uintx) \ 3344 \ 3345 product_pd(uintx, ProfiledCodeHeapSize, \ 3346 "Size of code heap with profiled methods (in bytes)") \ 3347 range(0, max_uintx) \ 3348 \ 3349 product_pd(uintx, NonNMethodCodeHeapSize, \ 3350 "Size of code heap with non-nmethods (in bytes)") \ 3351 range(0, max_uintx) \ 3352 \ 3353 product_pd(uintx, CodeCacheExpansionSize, \ 3354 "Code cache expansion size (in bytes)") \ 3355 range(0, max_uintx) \ 3356 \ 3357 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 3358 "Minimum number of segments in a code cache block") \ 3359 range(1, 100) \ 3360 \ 3361 notproduct(bool, ExitOnFullCodeCache, false, \ 3362 "Exit the VM if we fill the code cache") \ 3363 \ 3364 product(bool, UseCodeCacheFlushing, true, \ 3365 "Remove cold/old nmethods from the code cache") \ 3366 \ 3367 product(uintx, StartAggressiveSweepingAt, 10, \ 3368 "Start aggressive sweeping if X[%] of the code cache is free." \ 3369 "Segmented code cache: X[%] of the non-profiled heap." \ 3370 "Non-segmented code cache: X[%] of the total code cache") \ 3371 range(0, 100) \ 3372 \ 3373 /* AOT parameters */ \ 3374 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3375 "Use AOT compiled files") \ 3376 \ 3377 product(ccstrlist, AOTLibrary, NULL, \ 3378 "AOT library") \ 3379 \ 3380 product(bool, PrintAOT, false, \ 3381 "Print used AOT klasses and methods") \ 3382 \ 3383 notproduct(bool, PrintAOTStatistics, false, \ 3384 "Print AOT statistics") \ 3385 \ 3386 diagnostic(bool, UseAOTStrictLoading, false, \ 3387 "Exit the VM if any of the AOT libraries has invalid config") \ 3388 \ 3389 /* interpreter debugging */ \ 3390 develop(intx, BinarySwitchThreshold, 5, \ 3391 "Minimal number of lookupswitch entries for rewriting to binary " \ 3392 "switch") \ 3393 \ 3394 develop(intx, StopInterpreterAt, 0, \ 3395 "Stop interpreter execution at specified bytecode number") \ 3396 \ 3397 develop(intx, TraceBytecodesAt, 0, \ 3398 "Trace bytecodes starting with specified bytecode number") \ 3399 \ 3400 /* compiler interface */ \ 3401 develop(intx, CIStart, 0, \ 3402 "The id of the first compilation to permit") \ 3403 \ 3404 develop(intx, CIStop, max_jint, \ 3405 "The id of the last compilation to permit") \ 3406 \ 3407 develop(intx, CIStartOSR, 0, \ 3408 "The id of the first osr compilation to permit " \ 3409 "(CICountOSR must be on)") \ 3410 \ 3411 develop(intx, CIStopOSR, max_jint, \ 3412 "The id of the last osr compilation to permit " \ 3413 "(CICountOSR must be on)") \ 3414 \ 3415 develop(intx, CIBreakAtOSR, -1, \ 3416 "The id of osr compilation to break at") \ 3417 \ 3418 develop(intx, CIBreakAt, -1, \ 3419 "The id of compilation to break at") \ 3420 \ 3421 product(ccstrlist, CompileOnly, "", \ 3422 "List of methods (pkg/class.name) to restrict compilation to") \ 3423 \ 3424 product(ccstr, CompileCommandFile, NULL, \ 3425 "Read compiler commands from this file [.hotspot_compiler]") \ 3426 \ 3427 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3428 "Read compiler directives from this file") \ 3429 \ 3430 product(ccstrlist, CompileCommand, "", \ 3431 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3432 \ 3433 develop(bool, ReplayCompiles, false, \ 3434 "Enable replay of compilations from ReplayDataFile") \ 3435 \ 3436 product(ccstr, ReplayDataFile, NULL, \ 3437 "File containing compilation replay information" \ 3438 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3439 \ 3440 product(ccstr, InlineDataFile, NULL, \ 3441 "File containing inlining replay information" \ 3442 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3443 \ 3444 develop(intx, ReplaySuppressInitializers, 2, \ 3445 "Control handling of class initialization during replay: " \ 3446 "0 - don't do anything special; " \ 3447 "1 - treat all class initializers as empty; " \ 3448 "2 - treat class initializers for application classes as empty; " \ 3449 "3 - allow all class initializers to run during bootstrap but " \ 3450 " pretend they are empty after starting replay") \ 3451 range(0, 3) \ 3452 \ 3453 develop(bool, ReplayIgnoreInitErrors, false, \ 3454 "Ignore exceptions thrown during initialization for replay") \ 3455 \ 3456 product(bool, DumpReplayDataOnError, true, \ 3457 "Record replay data for crashing compiler threads") \ 3458 \ 3459 product(bool, CICompilerCountPerCPU, false, \ 3460 "1 compiler thread for log(N CPUs)") \ 3461 \ 3462 develop(intx, CIFireOOMAt, -1, \ 3463 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3464 "(non-negative value throws OOM after this many CI accesses " \ 3465 "in each compile)") \ 3466 notproduct(intx, CICrashAt, -1, \ 3467 "id of compilation to trigger assert in compiler thread for " \ 3468 "the purpose of testing, e.g. generation of replay data") \ 3469 notproduct(bool, CIObjectFactoryVerify, false, \ 3470 "enable potentially expensive verification in ciObjectFactory") \ 3471 \ 3472 /* Priorities */ \ 3473 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3474 \ 3475 product(intx, ThreadPriorityPolicy, 0, \ 3476 "0 : Normal. "\ 3477 " VM chooses priorities that are appropriate for normal "\ 3478 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3479 " to normal native priority. Java priorities below " \ 3480 " NORM_PRIORITY map to lower native priority values. On "\ 3481 " Windows applications are allowed to use higher native "\ 3482 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3483 " not use the highest possible native priority, "\ 3484 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3485 " system threads. On Linux thread priorities are ignored "\ 3486 " because the OS does not support static priority in "\ 3487 " SCHED_OTHER scheduling class which is the only choice for "\ 3488 " non-root, non-realtime applications. "\ 3489 "1 : Aggressive. "\ 3490 " Java thread priorities map over to the entire range of "\ 3491 " native thread priorities. Higher Java thread priorities map "\ 3492 " to higher native thread priorities. This policy should be "\ 3493 " used with care, as sometimes it can cause performance "\ 3494 " degradation in the application and/or the entire system. On "\ 3495 " Linux this policy requires root privilege.") \ 3496 range(0, 1) \ 3497 \ 3498 product(bool, ThreadPriorityVerbose, false, \ 3499 "Print priority changes") \ 3500 \ 3501 product(intx, CompilerThreadPriority, -1, \ 3502 "The native priority at which compiler threads should run " \ 3503 "(-1 means no change)") \ 3504 range(min_jint, max_jint) \ 3505 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3506 \ 3507 product(intx, VMThreadPriority, -1, \ 3508 "The native priority at which the VM thread should run " \ 3509 "(-1 means no change)") \ 3510 range(-1, 127) \ 3511 \ 3512 product(bool, CompilerThreadHintNoPreempt, true, \ 3513 "(Solaris only) Give compiler threads an extra quanta") \ 3514 \ 3515 product(bool, VMThreadHintNoPreempt, false, \ 3516 "(Solaris only) Give VM thread an extra quanta") \ 3517 \ 3518 product(intx, JavaPriority1_To_OSPriority, -1, \ 3519 "Map Java priorities to OS priorities") \ 3520 range(-1, 127) \ 3521 \ 3522 product(intx, JavaPriority2_To_OSPriority, -1, \ 3523 "Map Java priorities to OS priorities") \ 3524 range(-1, 127) \ 3525 \ 3526 product(intx, JavaPriority3_To_OSPriority, -1, \ 3527 "Map Java priorities to OS priorities") \ 3528 range(-1, 127) \ 3529 \ 3530 product(intx, JavaPriority4_To_OSPriority, -1, \ 3531 "Map Java priorities to OS priorities") \ 3532 range(-1, 127) \ 3533 \ 3534 product(intx, JavaPriority5_To_OSPriority, -1, \ 3535 "Map Java priorities to OS priorities") \ 3536 range(-1, 127) \ 3537 \ 3538 product(intx, JavaPriority6_To_OSPriority, -1, \ 3539 "Map Java priorities to OS priorities") \ 3540 range(-1, 127) \ 3541 \ 3542 product(intx, JavaPriority7_To_OSPriority, -1, \ 3543 "Map Java priorities to OS priorities") \ 3544 range(-1, 127) \ 3545 \ 3546 product(intx, JavaPriority8_To_OSPriority, -1, \ 3547 "Map Java priorities to OS priorities") \ 3548 range(-1, 127) \ 3549 \ 3550 product(intx, JavaPriority9_To_OSPriority, -1, \ 3551 "Map Java priorities to OS priorities") \ 3552 range(-1, 127) \ 3553 \ 3554 product(intx, JavaPriority10_To_OSPriority,-1, \ 3555 "Map Java priorities to OS priorities") \ 3556 range(-1, 127) \ 3557 \ 3558 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3559 "Java thread priority 10 maps to critical scheduling priority") \ 3560 \ 3561 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3562 "Compiler thread(s) run at critical scheduling priority") \ 3563 \ 3564 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3565 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3566 \ 3567 /* compiler debugging */ \ 3568 notproduct(intx, CompileTheWorldStartAt, 1, \ 3569 "First class to consider when using +CompileTheWorld") \ 3570 \ 3571 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3572 "Last class to consider when using +CompileTheWorld") \ 3573 \ 3574 develop(intx, NewCodeParameter, 0, \ 3575 "Testing Only: Create a dedicated integer parameter before " \ 3576 "putback") \ 3577 \ 3578 /* new oopmap storage allocation */ \ 3579 develop(intx, MinOopMapAllocation, 8, \ 3580 "Minimum number of OopMap entries in an OopMapSet") \ 3581 \ 3582 /* Background Compilation */ \ 3583 develop(intx, LongCompileThreshold, 50, \ 3584 "Used with +TraceLongCompiles") \ 3585 \ 3586 /* recompilation */ \ 3587 product_pd(intx, CompileThreshold, \ 3588 "number of interpreted method invocations before (re-)compiling") \ 3589 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3590 \ 3591 product(double, CompileThresholdScaling, 1.0, \ 3592 "Factor to control when first compilation happens " \ 3593 "(both with and without tiered compilation): " \ 3594 "values greater than 1.0 delay counter overflow, " \ 3595 "values between 0 and 1.0 rush counter overflow, " \ 3596 "value of 1.0 leaves compilation thresholds unchanged " \ 3597 "value of 0.0 is equivalent to -Xint. " \ 3598 "" \ 3599 "Flag can be set as per-method option. " \ 3600 "If a value is specified for a method, compilation thresholds " \ 3601 "for that method are scaled by both the value of the global flag "\ 3602 "and the value of the per-method flag.") \ 3603 range(0.0, DBL_MAX) \ 3604 \ 3605 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3606 "Interpreter (tier 0) invocation notification frequency") \ 3607 range(0, 30) \ 3608 \ 3609 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3610 "C1 without MDO (tier 2) invocation notification frequency") \ 3611 range(0, 30) \ 3612 \ 3613 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3614 "C1 with MDO profiling (tier 3) invocation notification " \ 3615 "frequency") \ 3616 range(0, 30) \ 3617 \ 3618 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3619 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3620 range(0, 30) \ 3621 \ 3622 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3623 "Interpreter (tier 0) invocation notification frequency") \ 3624 range(0, 30) \ 3625 \ 3626 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3627 "C1 without MDO (tier 2) invocation notification frequency") \ 3628 range(0, 30) \ 3629 \ 3630 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3631 "C1 with MDO profiling (tier 3) invocation notification " \ 3632 "frequency") \ 3633 range(0, 30) \ 3634 \ 3635 product(intx, Tier2CompileThreshold, 0, \ 3636 "threshold at which tier 2 compilation is invoked") \ 3637 range(0, max_jint) \ 3638 \ 3639 product(intx, Tier2BackEdgeThreshold, 0, \ 3640 "Back edge threshold at which tier 2 compilation is invoked") \ 3641 range(0, max_jint) \ 3642 \ 3643 product(intx, Tier3InvocationThreshold, 200, \ 3644 "Compile if number of method invocations crosses this " \ 3645 "threshold") \ 3646 range(0, max_jint) \ 3647 \ 3648 product(intx, Tier3MinInvocationThreshold, 100, \ 3649 "Minimum invocation to compile at tier 3") \ 3650 range(0, max_jint) \ 3651 \ 3652 product(intx, Tier3CompileThreshold, 2000, \ 3653 "Threshold at which tier 3 compilation is invoked (invocation " \ 3654 "minimum must be satisfied)") \ 3655 range(0, max_jint) \ 3656 \ 3657 product(intx, Tier3BackEdgeThreshold, 60000, \ 3658 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3659 range(0, max_jint) \ 3660 \ 3661 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3662 "Compile if number of method invocations crosses this " \ 3663 "threshold if coming from AOT") \ 3664 range(0, max_jint) \ 3665 \ 3666 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3667 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3668 range(0, max_jint) \ 3669 \ 3670 product(intx, Tier3AOTCompileThreshold, 15000, \ 3671 "Threshold at which tier 3 compilation is invoked (invocation " \ 3672 "minimum must be satisfied) if coming from AOT") \ 3673 range(0, max_jint) \ 3674 \ 3675 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3676 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3677 "if coming from AOT") \ 3678 range(0, max_jint) \ 3679 \ 3680 product(intx, Tier4InvocationThreshold, 5000, \ 3681 "Compile if number of method invocations crosses this " \ 3682 "threshold") \ 3683 range(0, max_jint) \ 3684 \ 3685 product(intx, Tier4MinInvocationThreshold, 600, \ 3686 "Minimum invocation to compile at tier 4") \ 3687 range(0, max_jint) \ 3688 \ 3689 product(intx, Tier4CompileThreshold, 15000, \ 3690 "Threshold at which tier 4 compilation is invoked (invocation " \ 3691 "minimum must be satisfied") \ 3692 range(0, max_jint) \ 3693 \ 3694 product(intx, Tier4BackEdgeThreshold, 40000, \ 3695 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3696 range(0, max_jint) \ 3697 \ 3698 product(intx, Tier3DelayOn, 5, \ 3699 "If C2 queue size grows over this amount per compiler thread " \ 3700 "stop compiling at tier 3 and start compiling at tier 2") \ 3701 range(0, max_jint) \ 3702 \ 3703 product(intx, Tier3DelayOff, 2, \ 3704 "If C2 queue size is less than this amount per compiler thread " \ 3705 "allow methods compiled at tier 2 transition to tier 3") \ 3706 range(0, max_jint) \ 3707 \ 3708 product(intx, Tier3LoadFeedback, 5, \ 3709 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3710 "reaches this amount per compiler thread") \ 3711 range(0, max_jint) \ 3712 \ 3713 product(intx, Tier4LoadFeedback, 3, \ 3714 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3715 "reaches this amount per compiler thread") \ 3716 range(0, max_jint) \ 3717 \ 3718 product(intx, TieredCompileTaskTimeout, 50, \ 3719 "Kill compile task if method was not used within " \ 3720 "given timeout in milliseconds") \ 3721 range(0, max_intx) \ 3722 \ 3723 product(intx, TieredStopAtLevel, 4, \ 3724 "Stop at given compilation level") \ 3725 range(0, 4) \ 3726 \ 3727 product(intx, Tier0ProfilingStartPercentage, 200, \ 3728 "Start profiling in interpreter if the counters exceed tier 3 " \ 3729 "thresholds by the specified percentage") \ 3730 range(0, max_jint) \ 3731 \ 3732 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3733 "Increase the compile threshold for C1 compilation if the code " \ 3734 "cache is filled by the specified percentage") \ 3735 range(0, 99) \ 3736 \ 3737 product(intx, TieredRateUpdateMinTime, 1, \ 3738 "Minimum rate sampling interval (in milliseconds)") \ 3739 range(0, max_intx) \ 3740 \ 3741 product(intx, TieredRateUpdateMaxTime, 25, \ 3742 "Maximum rate sampling interval (in milliseconds)") \ 3743 range(0, max_intx) \ 3744 \ 3745 product_pd(bool, TieredCompilation, \ 3746 "Enable tiered compilation") \ 3747 \ 3748 product(bool, PrintTieredEvents, false, \ 3749 "Print tiered events notifications") \ 3750 \ 3751 product_pd(intx, OnStackReplacePercentage, \ 3752 "NON_TIERED number of method invocations/branches (expressed as " \ 3753 "% of CompileThreshold) before (re-)compiling OSR code") \ 3754 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3755 \ 3756 product(intx, InterpreterProfilePercentage, 33, \ 3757 "NON_TIERED number of method invocations/branches (expressed as " \ 3758 "% of CompileThreshold) before profiling in the interpreter") \ 3759 range(0, 100) \ 3760 \ 3761 develop(intx, MaxRecompilationSearchLength, 10, \ 3762 "The maximum number of frames to inspect when searching for " \ 3763 "recompilee") \ 3764 \ 3765 develop(intx, MaxInterpretedSearchLength, 3, \ 3766 "The maximum number of interpreted frames to skip when searching "\ 3767 "for recompilee") \ 3768 \ 3769 develop(intx, DesiredMethodLimit, 8000, \ 3770 "The desired maximum method size (in bytecodes) after inlining") \ 3771 \ 3772 develop(intx, HugeMethodLimit, 8000, \ 3773 "Don't compile methods larger than this if " \ 3774 "+DontCompileHugeMethods") \ 3775 \ 3776 /* New JDK 1.4 reflection implementation */ \ 3777 \ 3778 develop(intx, FastSuperclassLimit, 8, \ 3779 "Depth of hardwired instanceof accelerator array") \ 3780 \ 3781 /* Properties for Java libraries */ \ 3782 \ 3783 product(uint64_t, MaxDirectMemorySize, 0, \ 3784 "Maximum total size of NIO direct-buffer allocations") \ 3785 range(0, max_jlong) \ 3786 \ 3787 /* Flags used for temporary code during development */ \ 3788 \ 3789 diagnostic(bool, UseNewCode, false, \ 3790 "Testing Only: Use the new version while testing") \ 3791 \ 3792 diagnostic(bool, UseNewCode2, false, \ 3793 "Testing Only: Use the new version while testing") \ 3794 \ 3795 diagnostic(bool, UseNewCode3, false, \ 3796 "Testing Only: Use the new version while testing") \ 3797 \ 3798 /* flags for performance data collection */ \ 3799 \ 3800 product(bool, UsePerfData, true, \ 3801 "Flag to disable jvmstat instrumentation for performance testing "\ 3802 "and problem isolation purposes") \ 3803 \ 3804 product(bool, PerfDataSaveToFile, false, \ 3805 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3806 \ 3807 product(ccstr, PerfDataSaveFile, NULL, \ 3808 "Save PerfData memory to the specified absolute pathname. " \ 3809 "The string %p in the file name (if present) " \ 3810 "will be replaced by pid") \ 3811 \ 3812 product(intx, PerfDataSamplingInterval, 50, \ 3813 "Data sampling interval (in milliseconds)") \ 3814 range(PeriodicTask::min_interval, max_jint) \ 3815 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3816 \ 3817 product(bool, PerfDisableSharedMem, false, \ 3818 "Store performance data in standard memory") \ 3819 \ 3820 product(intx, PerfDataMemorySize, 32*K, \ 3821 "Size of performance data memory region. Will be rounded " \ 3822 "up to a multiple of the native os page size.") \ 3823 range(128, 32*64*K) \ 3824 \ 3825 product(intx, PerfMaxStringConstLength, 1024, \ 3826 "Maximum PerfStringConstant string length before truncation") \ 3827 range(32, 32*K) \ 3828 \ 3829 product(bool, PerfAllowAtExitRegistration, false, \ 3830 "Allow registration of atexit() methods") \ 3831 \ 3832 product(bool, PerfBypassFileSystemCheck, false, \ 3833 "Bypass Win32 file system criteria checks (Windows Only)") \ 3834 \ 3835 product(intx, UnguardOnExecutionViolation, 0, \ 3836 "Unguard page and retry on no-execute fault (Win32 only) " \ 3837 "0=off, 1=conservative, 2=aggressive") \ 3838 range(0, 2) \ 3839 \ 3840 /* Serviceability Support */ \ 3841 \ 3842 product(bool, ManagementServer, false, \ 3843 "Create JMX Management Server") \ 3844 \ 3845 product(bool, DisableAttachMechanism, false, \ 3846 "Disable mechanism that allows tools to attach to this VM") \ 3847 \ 3848 product(bool, StartAttachListener, false, \ 3849 "Always start Attach Listener at VM startup") \ 3850 \ 3851 product(bool, EnableDynamicAgentLoading, true, \ 3852 "Allow tools to load agents with the attach mechanism") \ 3853 \ 3854 manageable(bool, PrintConcurrentLocks, false, \ 3855 "Print java.util.concurrent locks in thread dump") \ 3856 \ 3857 product(bool, TransmitErrorReport, false, \ 3858 "Enable error report transmission on erroneous termination") \ 3859 \ 3860 product(ccstr, ErrorReportServer, NULL, \ 3861 "Override built-in error report server address") \ 3862 \ 3863 /* Shared spaces */ \ 3864 \ 3865 product(bool, UseSharedSpaces, true, \ 3866 "Use shared spaces for metadata") \ 3867 \ 3868 product(bool, VerifySharedSpaces, false, \ 3869 "Verify shared spaces (false for default archive, true for " \ 3870 "archive specified by -XX:SharedArchiveFile)") \ 3871 \ 3872 product(bool, RequireSharedSpaces, false, \ 3873 "Require shared spaces for metadata") \ 3874 \ 3875 product(bool, DumpSharedSpaces, false, \ 3876 "Special mode: JVM reads a class list, loads classes, builds " \ 3877 "shared spaces, and dumps the shared spaces to a file to be " \ 3878 "used in future JVM runs") \ 3879 \ 3880 product(bool, PrintSharedSpaces, false, \ 3881 "Print usage of shared spaces") \ 3882 \ 3883 product(bool, PrintSharedArchiveAndExit, false, \ 3884 "Print shared archive file contents") \ 3885 \ 3886 product(bool, PrintSharedDictionary, false, \ 3887 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3888 "dictionary") \ 3889 \ 3890 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \ 3891 "Size of read-write space for metadata (in bytes)") \ 3892 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \ 3893 constraint(SharedReadWriteSizeConstraintFunc,AfterErgo) \ 3894 \ 3895 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \ 3896 "Size of read-only space for metadata (in bytes)") \ 3897 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \ 3898 constraint(SharedReadOnlySizeConstraintFunc,AfterErgo) \ 3899 \ 3900 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \ 3901 "Size of the shared miscellaneous data area (in bytes)") \ 3902 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \ 3903 constraint(SharedMiscDataSizeConstraintFunc,AfterErgo) \ 3904 \ 3905 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \ 3906 "Size of the shared miscellaneous code area (in bytes)") \ 3907 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \ 3908 constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo) \ 3909 \ 3910 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3911 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3912 "Address to allocate shared memory region for class data") \ 3913 range(0, SIZE_MAX) \ 3914 \ 3915 product(uintx, SharedSymbolTableBucketSize, 4, \ 3916 "Average number of symbols per bucket in shared table") \ 3917 range(2, 246) \ 3918 \ 3919 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3920 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3921 "classes. Just exclude them from the shared dictionary.") \ 3922 \ 3923 diagnostic(bool, PrintMethodHandleStubs, false, \ 3924 "Print generated stub code for method handles") \ 3925 \ 3926 develop(bool, TraceMethodHandles, false, \ 3927 "trace internal method handle operations") \ 3928 \ 3929 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3930 "perform extra checks when constructing method handles") \ 3931 \ 3932 diagnostic(bool, ShowHiddenFrames, false, \ 3933 "show method handle implementation frames (usually hidden)") \ 3934 \ 3935 experimental(bool, TrustFinalNonStaticFields, false, \ 3936 "trust final non-static declarations for constant folding") \ 3937 \ 3938 diagnostic(bool, FoldStableValues, true, \ 3939 "Optimize loads from stable fields (marked w/ @Stable)") \ 3940 \ 3941 develop(bool, TraceInvokeDynamic, false, \ 3942 "trace internal invoke dynamic operations") \ 3943 \ 3944 diagnostic(bool, PauseAtStartup, false, \ 3945 "Causes the VM to pause at startup time and wait for the pause " \ 3946 "file to be removed (default: ./vm.paused.<pid>)") \ 3947 \ 3948 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3949 "The file to create and for whose removal to await when pausing " \ 3950 "at startup. (default: ./vm.paused.<pid>)") \ 3951 \ 3952 diagnostic(bool, PauseAtExit, false, \ 3953 "Pause and wait for keypress on exit if a debugger is attached") \ 3954 \ 3955 product(bool, ExtendedDTraceProbes, false, \ 3956 "Enable performance-impacting dtrace probes") \ 3957 \ 3958 product(bool, DTraceMethodProbes, false, \ 3959 "Enable dtrace probes for method-entry and method-exit") \ 3960 \ 3961 product(bool, DTraceAllocProbes, false, \ 3962 "Enable dtrace probes for object allocation") \ 3963 \ 3964 product(bool, DTraceMonitorProbes, false, \ 3965 "Enable dtrace probes for monitor events") \ 3966 \ 3967 product(bool, RelaxAccessControlCheck, false, \ 3968 "Relax the access control checks in the verifier") \ 3969 \ 3970 product(uintx, StringTableSize, defaultStringTableSize, \ 3971 "Number of buckets in the interned String table") \ 3972 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3973 \ 3974 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3975 "Number of buckets in the JVM internal Symbol table") \ 3976 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3977 \ 3978 product(bool, UseStringDeduplication, false, \ 3979 "Use string deduplication") \ 3980 \ 3981 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3982 "A string must reach this age (or be promoted to an old region) " \ 3983 "to be considered for deduplication") \ 3984 range(1, markOopDesc::max_age) \ 3985 \ 3986 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3987 "Force table resize every time the table is scanned") \ 3988 \ 3989 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3990 "Force table rehash every time the table is scanned") \ 3991 \ 3992 diagnostic(bool, WhiteBoxAPI, false, \ 3993 "Enable internal testing APIs") \ 3994 \ 3995 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3996 "Default survivor space alignment in bytes") \ 3997 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 3998 \ 3999 product(bool , AllowNonVirtualCalls, false, \ 4000 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 4001 \ 4002 product(ccstr, DumpLoadedClassList, NULL, \ 4003 "Dump the names all loaded classes, that could be stored into " \ 4004 "the CDS archive, in the specified file") \ 4005 \ 4006 product(ccstr, SharedClassListFile, NULL, \ 4007 "Override the default CDS class list") \ 4008 \ 4009 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4010 "Override the default location of the CDS archive file") \ 4011 \ 4012 product(ccstr, ExtraSharedClassListFile, NULL, \ 4013 "Extra classlist for building the CDS archive file") \ 4014 \ 4015 experimental(size_t, ArrayAllocatorMallocLimit, \ 4016 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4017 "Allocation less than this value will be allocated " \ 4018 "using malloc. Larger allocations will use mmap.") \ 4019 \ 4020 experimental(bool, AlwaysAtomicAccesses, false, \ 4021 "Accesses to all variables should always be atomic") \ 4022 \ 4023 product(bool, EnableTracing, false, \ 4024 "Enable event-based tracing") \ 4025 \ 4026 product(bool, UseLockedTracing, false, \ 4027 "Use locked-tracing when doing event-based tracing") \ 4028 \ 4029 diagnostic(bool, UseUnalignedAccesses, false, \ 4030 "Use unaligned memory accesses in Unsafe") \ 4031 \ 4032 product_pd(bool, PreserveFramePointer, \ 4033 "Use the FP register for holding the frame pointer " \ 4034 "and not as a general purpose register.") \ 4035 \ 4036 diagnostic(bool, CheckIntrinsics, true, \ 4037 "When a class C is loaded, check that " \ 4038 "(1) all intrinsics defined by the VM for class C are present "\ 4039 "in the loaded class file and are marked with the " \ 4040 "@HotSpotIntrinsicCandidate annotation, that " \ 4041 "(2) there is an intrinsic registered for all loaded methods " \ 4042 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4043 "annotation, and that " \ 4044 "(3) no orphan methods exist for class C (i.e., methods for " \ 4045 "which the VM declares an intrinsic but that are not declared "\ 4046 "in the loaded class C. " \ 4047 "Check (3) is available only in debug builds.") \ 4048 \ 4049 diagnostic_pd(intx, InitArrayShortSize, \ 4050 "Threshold small size (in bytes) for clearing arrays. " \ 4051 "Anything this size or smaller may get converted to discrete " \ 4052 "scalar stores.") \ 4053 range(0, max_intx) \ 4054 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4055 \ 4056 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4057 "Disable backwards compatibility for compile commands.") \ 4058 \ 4059 diagnostic(bool, CompilerDirectivesPrint, false, \ 4060 "Print compiler directives on installation.") \ 4061 diagnostic(int, CompilerDirectivesLimit, 50, \ 4062 "Limit on number of compiler directives.") 4063 4064 4065/* 4066 * Macros for factoring of globals 4067 */ 4068 4069// Interface macros 4070#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4071#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4072#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4073#define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4074#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4075#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4076#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4077#ifdef PRODUCT 4078#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4079#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4080#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4081#else 4082#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4083#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4084#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4085#endif // PRODUCT 4086// Special LP64 flags, product only needed for now. 4087#ifdef _LP64 4088#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4089#else 4090#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4091#endif // _LP64 4092 4093// Implementation macros 4094#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4095#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4096#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4097#define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4098#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4099#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4100#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4101#ifdef PRODUCT 4102#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4103#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4104#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4105#else 4106#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4107#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4108#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4109#endif // PRODUCT 4110#ifdef _LP64 4111#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4112#else 4113#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4114#endif // _LP64 4115 4116// Only materialize src code for range checking when required, ignore otherwise 4117#define IGNORE_RANGE(a, b) 4118// Only materialize src code for contraint checking when required, ignore otherwise 4119#define IGNORE_CONSTRAINT(func,type) 4120 4121#define IGNORE_WRITEABLE(type) 4122 4123RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4124 DECLARE_PD_DEVELOPER_FLAG, \ 4125 DECLARE_PRODUCT_FLAG, \ 4126 DECLARE_PD_PRODUCT_FLAG, \ 4127 DECLARE_DIAGNOSTIC_FLAG, \ 4128 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4129 DECLARE_EXPERIMENTAL_FLAG, \ 4130 DECLARE_NOTPRODUCT_FLAG, \ 4131 DECLARE_MANAGEABLE_FLAG, \ 4132 DECLARE_PRODUCT_RW_FLAG, \ 4133 DECLARE_LP64_PRODUCT_FLAG, \ 4134 IGNORE_RANGE, \ 4135 IGNORE_CONSTRAINT, \ 4136 IGNORE_WRITEABLE) 4137 4138RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4139 DECLARE_PD_DEVELOPER_FLAG, \ 4140 DECLARE_PRODUCT_FLAG, \ 4141 DECLARE_PD_PRODUCT_FLAG, \ 4142 DECLARE_DIAGNOSTIC_FLAG, \ 4143 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4144 DECLARE_NOTPRODUCT_FLAG, \ 4145 IGNORE_RANGE, \ 4146 IGNORE_CONSTRAINT, \ 4147 IGNORE_WRITEABLE) 4148 4149ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4150 DECLARE_PRODUCT_FLAG, \ 4151 DECLARE_DIAGNOSTIC_FLAG, \ 4152 DECLARE_EXPERIMENTAL_FLAG, \ 4153 DECLARE_NOTPRODUCT_FLAG, \ 4154 IGNORE_RANGE, \ 4155 IGNORE_CONSTRAINT, \ 4156 IGNORE_WRITEABLE) 4157 4158// Extensions 4159 4160#include "runtime/globals_ext.hpp" 4161 4162#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4163