globals.hpp revision 12117:a2f56f1169d4
1/* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29#include "utilities/macros.hpp" 30 31#include <float.h> // for DBL_MAX 32 33// use this for flags that are true per default in the tiered build 34// but false in non-tiered builds, and vice versa 35#ifdef TIERED 36#define trueInTiered true 37#define falseInTiered false 38#else 39#define trueInTiered false 40#define falseInTiered true 41#endif 42 43#include CPU_HEADER(globals) 44#include OS_HEADER(globals) 45#include OS_CPU_HEADER(globals) 46#ifdef COMPILER1 47#include CPU_HEADER(c1_globals) 48#include OS_HEADER(c1_globals) 49#endif 50#ifdef COMPILER2 51#include CPU_HEADER(c2_globals) 52#include OS_HEADER(c2_globals) 53#endif 54#ifdef SHARK 55#ifdef ZERO 56# include "shark_globals_zero.hpp" 57#endif 58#endif 59 60#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI 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; 189 190 // points to all Flags static array 191 static Flag* flags; 192 193 // number of flags 194 static size_t numFlags; 195 196 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 197 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 198 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 199 200 static const char* get_int_default_range_str(); 201 static const char* get_uint_default_range_str(); 202 static const char* get_intx_default_range_str(); 203 static const char* get_uintx_default_range_str(); 204 static const char* get_uint64_t_default_range_str(); 205 static const char* get_size_t_default_range_str(); 206 static const char* get_double_default_range_str(); 207 208 Flag::Error check_writable(bool changed); 209 210 bool is_bool() const; 211 bool get_bool() const; 212 Flag::Error set_bool(bool value); 213 214 bool is_int() const; 215 int get_int() const; 216 Flag::Error set_int(int value); 217 218 bool is_uint() const; 219 uint get_uint() const; 220 Flag::Error set_uint(uint value); 221 222 bool is_intx() const; 223 intx get_intx() const; 224 Flag::Error set_intx(intx value); 225 226 bool is_uintx() const; 227 uintx get_uintx() const; 228 Flag::Error set_uintx(uintx value); 229 230 bool is_uint64_t() const; 231 uint64_t get_uint64_t() const; 232 Flag::Error set_uint64_t(uint64_t value); 233 234 bool is_size_t() const; 235 size_t get_size_t() const; 236 Flag::Error set_size_t(size_t value); 237 238 bool is_double() const; 239 double get_double() const; 240 Flag::Error set_double(double value); 241 242 bool is_ccstr() const; 243 bool ccstr_accumulates() const; 244 ccstr get_ccstr() const; 245 Flag::Error set_ccstr(ccstr value); 246 247 Flags get_origin(); 248 void set_origin(Flags origin); 249 250 bool is_default(); 251 bool is_ergonomic(); 252 bool is_command_line(); 253 void set_command_line(); 254 255 bool is_product() const; 256 bool is_manageable() const; 257 bool is_diagnostic() const; 258 bool is_experimental() const; 259 bool is_notproduct() const; 260 bool is_develop() const; 261 bool is_read_write() const; 262 bool is_commercial() const; 263 264 bool is_constant_in_binary() const; 265 266 bool is_unlocker() const; 267 bool is_unlocked() const; 268 bool is_writeable() const; 269 bool is_external() const; 270 271 bool is_unlocker_ext() const; 272 bool is_unlocked_ext() const; 273 bool is_writeable_ext() const; 274 bool is_external_ext() const; 275 276 void unlock_diagnostic(); 277 278 Flag::MsgType get_locked_message(char*, int) const; 279 void get_locked_message_ext(char*, int) const; 280 281 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 282 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 283 void print_kind_and_origin(outputStream* st); 284 void print_as_flag(outputStream* st); 285 286 static const char* flag_error_str(Flag::Error error); 287}; 288 289// debug flags control various aspects of the VM and are global accessible 290 291// use FlagSetting to temporarily change some debug flag 292// e.g. FlagSetting fs(DebugThisAndThat, true); 293// restored to previous value upon leaving scope 294class FlagSetting { 295 bool val; 296 bool* flag; 297 public: 298 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 299 ~FlagSetting() { *flag = val; } 300}; 301 302 303class CounterSetting { 304 intx* counter; 305 public: 306 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 307 ~CounterSetting() { (*counter)--; } 308}; 309 310class IntFlagSetting { 311 int val; 312 int* flag; 313 public: 314 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 315 ~IntFlagSetting() { *flag = val; } 316}; 317 318class UIntFlagSetting { 319 uint val; 320 uint* flag; 321 public: 322 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 323 ~UIntFlagSetting() { *flag = val; } 324}; 325 326class UIntXFlagSetting { 327 uintx val; 328 uintx* flag; 329 public: 330 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 331 ~UIntXFlagSetting() { *flag = val; } 332}; 333 334class DoubleFlagSetting { 335 double val; 336 double* flag; 337 public: 338 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 339 ~DoubleFlagSetting() { *flag = val; } 340}; 341 342class SizeTFlagSetting { 343 size_t val; 344 size_t* flag; 345 public: 346 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 347 ~SizeTFlagSetting() { *flag = val; } 348}; 349 350// Helper class for temporarily saving the value of a flag during a scope. 351template <size_t SIZE> 352class FlagGuard { 353 unsigned char _value[SIZE]; 354 void* const _addr; 355 356 // Hide operator new, this class should only be allocated on the stack. 357 // NOTE: Cannot include memory/allocation.hpp here due to circular 358 // dependencies. 359 void* operator new(size_t size) throw(); 360 void* operator new [](size_t size) throw(); 361 362 public: 363 FlagGuard(void* flag_addr) : _addr(flag_addr) { 364 memcpy(_value, _addr, SIZE); 365 } 366 367 ~FlagGuard() { 368 memcpy(_addr, _value, SIZE); 369 } 370}; 371 372#define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 373 374class CommandLineFlags { 375public: 376 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 377 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 378 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 379 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 380 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 381 382 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 383 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); } 384 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 385 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 386 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 387 388 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 389 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 390 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 391 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 392 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 393 394 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 395 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 396 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 397 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 398 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 399 400 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 401 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 402 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 403 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 404 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 405 406 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 407 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); } 408 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 409 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 410 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 411 412 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 413 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 414 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 415 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 416 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 417 418 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 419 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 420 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 421 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 422 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 423 424 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 425 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 426 // Contract: Flag will make private copy of the incoming value. 427 // Outgoing value is always malloc-ed, and caller MUST call free. 428 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 429 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 430 431 // Returns false if name is not a command line flag. 432 static bool wasSetOnCmdline(const char* name, bool* value); 433 static void printSetFlags(outputStream* out); 434 435 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 436 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 437 438 static void verify() PRODUCT_RETURN; 439}; 440 441// use this for flags that are true by default in the debug version but 442// false in the optimized version, and vice versa 443#ifdef ASSERT 444#define trueInDebug true 445#define falseInDebug false 446#else 447#define trueInDebug false 448#define falseInDebug true 449#endif 450 451// use this for flags that are true per default in the product build 452// but false in development builds, and vice versa 453#ifdef PRODUCT 454#define trueInProduct true 455#define falseInProduct false 456#else 457#define trueInProduct false 458#define falseInProduct true 459#endif 460 461// develop flags are settable / visible only during development and are constant in the PRODUCT version 462// product flags are always settable / visible 463// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 464 465// A flag must be declared with one of the following types: 466// bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 467// The type "ccstr" is an alias for "const char*" and is used 468// only in this file, because the macrology requires single-token type names. 469 470// Note: Diagnostic options not meant for VM tuning or for product modes. 471// They are to be used for VM quality assurance or field diagnosis 472// of VM bugs. They are hidden so that users will not be encouraged to 473// try them as if they were VM ordinary execution options. However, they 474// are available in the product version of the VM. Under instruction 475// from support engineers, VM customers can turn them on to collect 476// diagnostic information about VM problems. To use a VM diagnostic 477// option, you must first specify +UnlockDiagnosticVMOptions. 478// (This master switch also affects the behavior of -Xprintflags.) 479// 480// experimental flags are in support of features that are not 481// part of the officially supported product, but are available 482// for experimenting with. They could, for example, be performance 483// features that may not have undergone full or rigorous QA, but which may 484// help performance in some cases and released for experimentation 485// by the community of users and developers. This flag also allows one to 486// be able to build a fully supported product that nonetheless also 487// ships with some unsupported, lightly tested, experimental features. 488// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 489// UnlockExperimentalVMOptions flag, which allows the control and 490// modification of the experimental flags. 491// 492// Nota bene: neither diagnostic nor experimental options should be used casually, 493// and they are not supported on production loads, except under explicit 494// direction from support engineers. 495// 496// manageable flags are writeable external product flags. 497// They are dynamically writeable through the JDK management interface 498// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 499// These flags are external exported interface (see CCC). The list of 500// manageable flags can be queried programmatically through the management 501// interface. 502// 503// A flag can be made as "manageable" only if 504// - the flag is defined in a CCC as an external exported interface. 505// - the VM implementation supports dynamic setting of the flag. 506// This implies that the VM must *always* query the flag variable 507// and not reuse state related to the flag state at any given time. 508// - you want the flag to be queried programmatically by the customers. 509// 510// product_rw flags are writeable internal product flags. 511// They are like "manageable" flags but for internal/private use. 512// The list of product_rw flags are internal/private flags which 513// may be changed/removed in a future release. It can be set 514// through the management interface to get/set value 515// when the name of flag is supplied. 516// 517// A flag can be made as "product_rw" only if 518// - the VM implementation supports dynamic setting of the flag. 519// This implies that the VM must *always* query the flag variable 520// and not reuse state related to the flag state at any given time. 521// 522// Note that when there is a need to support develop flags to be writeable, 523// it can be done in the same way as product_rw. 524// 525// range is a macro that will expand to min and max arguments for range 526// checking code if provided - see commandLineFlagRangeList.hpp 527// 528// constraint is a macro that will expand to custom function call 529// for constraint checking if provided - see commandLineFlagConstraintList.hpp 530// 531// writeable is a macro that controls if and how the value can change during the runtime 532// 533// writeable(Always) is optional and allows the flag to have its value changed 534// without any limitations at any time 535// 536// writeable(Once) flag value's can be only set once during the lifetime of VM 537// 538// writeable(CommandLineOnly) flag value's can be only set from command line 539// (multiple times allowed) 540// 541 542 543#define RUNTIME_FLAGS(develop, \ 544 develop_pd, \ 545 product, \ 546 product_pd, \ 547 diagnostic, \ 548 diagnostic_pd, \ 549 experimental, \ 550 notproduct, \ 551 manageable, \ 552 product_rw, \ 553 lp64_product, \ 554 range, \ 555 constraint, \ 556 writeable) \ 557 \ 558 lp64_product(bool, UseCompressedOops, false, \ 559 "Use 32-bit object references in 64-bit VM. " \ 560 "lp64_product means flag is always constant in 32 bit VM") \ 561 \ 562 lp64_product(bool, UseCompressedClassPointers, false, \ 563 "Use 32-bit class pointers in 64-bit VM. " \ 564 "lp64_product means flag is always constant in 32 bit VM") \ 565 \ 566 notproduct(bool, CheckCompressedOops, true, \ 567 "Generate checks in encoding/decoding code in debug VM") \ 568 \ 569 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 570 "Heap allocation steps through preferred address regions to find" \ 571 " where it can allocate the heap. Number of steps to take per " \ 572 "region.") \ 573 range(1, max_uintx) \ 574 \ 575 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 576 "Default object alignment in bytes, 8 is minimum") \ 577 range(8, 256) \ 578 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 579 \ 580 product(bool, AssumeMP, false, \ 581 "Instruct the VM to assume multiple processors are available") \ 582 \ 583 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 584 /* removal testing. It was supposed to be removed before FCS but has */ \ 585 /* been re-added (see 6401008) */ \ 586 product_pd(bool, UseMembar, \ 587 "(Unstable) Issues membars on thread state transitions") \ 588 \ 589 develop(bool, CleanChunkPoolAsync, true, \ 590 "Clean the chunk pool asynchronously") \ 591 \ 592 experimental(bool, AlwaysSafeConstructors, false, \ 593 "Force safe construction, as if all fields are final.") \ 594 \ 595 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 596 "Enable normal processing of flags relating to field diagnostics")\ 597 \ 598 experimental(bool, UnlockExperimentalVMOptions, false, \ 599 "Enable normal processing of flags relating to experimental " \ 600 "features") \ 601 \ 602 product(bool, JavaMonitorsInStackTrace, true, \ 603 "Print information about Java monitor locks when the stacks are" \ 604 "dumped") \ 605 \ 606 product_pd(bool, UseLargePages, \ 607 "Use large page memory") \ 608 \ 609 product_pd(bool, UseLargePagesIndividualAllocation, \ 610 "Allocate large pages individually for better affinity") \ 611 \ 612 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 613 "Fail large pages individual allocation") \ 614 \ 615 product(bool, UseLargePagesInMetaspace, false, \ 616 "Use large page memory in metaspace. " \ 617 "Only used if UseLargePages is enabled.") \ 618 \ 619 product(bool, UseNUMA, false, \ 620 "Use NUMA if available") \ 621 \ 622 product(bool, UseNUMAInterleaving, false, \ 623 "Interleave memory across NUMA nodes if available") \ 624 \ 625 product(size_t, NUMAInterleaveGranularity, 2*M, \ 626 "Granularity to use for NUMA interleaving on Windows OS") \ 627 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 628 \ 629 product(bool, ForceNUMA, false, \ 630 "Force NUMA optimizations on single-node/UMA systems") \ 631 \ 632 product(uintx, NUMAChunkResizeWeight, 20, \ 633 "Percentage (0-100) used to weight the current sample when " \ 634 "computing exponentially decaying average for " \ 635 "AdaptiveNUMAChunkSizing") \ 636 range(0, 100) \ 637 \ 638 product(size_t, NUMASpaceResizeRate, 1*G, \ 639 "Do not reallocate more than this amount per collection") \ 640 range(0, max_uintx) \ 641 \ 642 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 643 "Enable adaptive chunk sizing for NUMA") \ 644 \ 645 product(bool, NUMAStats, false, \ 646 "Print NUMA stats in detailed heap information") \ 647 \ 648 product(uintx, NUMAPageScanRate, 256, \ 649 "Maximum number of pages to include in the page scan procedure") \ 650 range(0, max_uintx) \ 651 \ 652 product_pd(bool, NeedsDeoptSuspend, \ 653 "True for register window machines (sparc/ia64)") \ 654 \ 655 product(intx, UseSSE, 99, \ 656 "Highest supported SSE instructions set on x86/x64") \ 657 range(0, 99) \ 658 \ 659 product(bool, UseAES, false, \ 660 "Control whether AES instructions can be used on x86/x64") \ 661 \ 662 product(bool, UseSHA, false, \ 663 "Control whether SHA instructions can be used " \ 664 "on SPARC, on ARM and on x86") \ 665 \ 666 diagnostic(bool, UseGHASHIntrinsics, false, \ 667 "Use intrinsics for GHASH versions of crypto") \ 668 \ 669 product(size_t, LargePageSizeInBytes, 0, \ 670 "Large page size (0 to let VM choose the page size)") \ 671 range(0, max_uintx) \ 672 \ 673 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 674 "Use large pages if maximum heap is at least this big") \ 675 range(0, max_uintx) \ 676 \ 677 product(bool, ForceTimeHighResolution, false, \ 678 "Using high time resolution (for Win32 only)") \ 679 \ 680 develop(bool, TracePcPatching, false, \ 681 "Trace usage of frame::patch_pc") \ 682 \ 683 develop(bool, TraceRelocator, false, \ 684 "Trace the bytecode relocator") \ 685 \ 686 develop(bool, TraceLongCompiles, false, \ 687 "Print out every time compilation is longer than " \ 688 "a given threshold") \ 689 \ 690 develop(bool, SafepointALot, false, \ 691 "Generate a lot of safepoints. This works with " \ 692 "GuaranteedSafepointInterval") \ 693 \ 694 product_pd(bool, BackgroundCompilation, \ 695 "A thread requesting compilation is not blocked during " \ 696 "compilation") \ 697 \ 698 product(bool, PrintVMQWaitTime, false, \ 699 "Print out the waiting time in VM operation queue") \ 700 \ 701 develop(bool, TraceOopMapGeneration, false, \ 702 "Show OopMapGeneration") \ 703 \ 704 product(bool, MethodFlushing, true, \ 705 "Reclamation of zombie and not-entrant methods") \ 706 \ 707 develop(bool, VerifyStack, false, \ 708 "Verify stack of each thread when it is entering a runtime call") \ 709 \ 710 diagnostic(bool, ForceUnreachable, false, \ 711 "Make all non code cache addresses to be unreachable by " \ 712 "forcing use of 64bit literal fixups") \ 713 \ 714 notproduct(bool, StressDerivedPointers, false, \ 715 "Force scavenge when a derived pointer is detected on stack " \ 716 "after rtm call") \ 717 \ 718 develop(bool, TraceDerivedPointers, false, \ 719 "Trace traversal of derived pointers on stack") \ 720 \ 721 notproduct(bool, TraceCodeBlobStacks, false, \ 722 "Trace stack-walk of codeblobs") \ 723 \ 724 product(bool, PrintJNIResolving, false, \ 725 "Used to implement -v:jni") \ 726 \ 727 notproduct(bool, PrintRewrites, false, \ 728 "Print methods that are being rewritten") \ 729 \ 730 product(bool, UseInlineCaches, true, \ 731 "Use Inline Caches for virtual calls ") \ 732 \ 733 diagnostic(bool, InlineArrayCopy, true, \ 734 "Inline arraycopy native that is known to be part of " \ 735 "base library DLL") \ 736 \ 737 diagnostic(bool, InlineObjectHash, true, \ 738 "Inline Object::hashCode() native that is known to be part " \ 739 "of base library DLL") \ 740 \ 741 diagnostic(bool, InlineNatives, true, \ 742 "Inline natives that are known to be part of base library DLL") \ 743 \ 744 diagnostic(bool, InlineMathNatives, true, \ 745 "Inline SinD, CosD, etc.") \ 746 \ 747 diagnostic(bool, InlineClassNatives, true, \ 748 "Inline Class.isInstance, etc") \ 749 \ 750 diagnostic(bool, InlineThreadNatives, true, \ 751 "Inline Thread.currentThread, etc") \ 752 \ 753 diagnostic(bool, InlineUnsafeOps, true, \ 754 "Inline memory ops (native methods) from Unsafe") \ 755 \ 756 product(bool, CriticalJNINatives, true, \ 757 "Check for critical JNI entry points") \ 758 \ 759 notproduct(bool, StressCriticalJNINatives, false, \ 760 "Exercise register saving code in critical natives") \ 761 \ 762 diagnostic(bool, UseAESIntrinsics, false, \ 763 "Use intrinsics for AES versions of crypto") \ 764 \ 765 diagnostic(bool, UseAESCTRIntrinsics, false, \ 766 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 767 \ 768 diagnostic(bool, UseSHA1Intrinsics, false, \ 769 "Use intrinsics for SHA-1 crypto hash function. " \ 770 "Requires that UseSHA is enabled.") \ 771 \ 772 diagnostic(bool, UseSHA256Intrinsics, false, \ 773 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 774 "Requires that UseSHA is enabled.") \ 775 \ 776 diagnostic(bool, UseSHA512Intrinsics, false, \ 777 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 778 "Requires that UseSHA is enabled.") \ 779 \ 780 diagnostic(bool, UseCRC32Intrinsics, false, \ 781 "use intrinsics for java.util.zip.CRC32") \ 782 \ 783 diagnostic(bool, UseCRC32CIntrinsics, false, \ 784 "use intrinsics for java.util.zip.CRC32C") \ 785 \ 786 diagnostic(bool, UseAdler32Intrinsics, false, \ 787 "use intrinsics for java.util.zip.Adler32") \ 788 \ 789 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 790 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 791 \ 792 diagnostic(ccstrlist, DisableIntrinsic, "", \ 793 "do not expand intrinsics whose (internal) names appear here") \ 794 \ 795 develop(bool, TraceCallFixup, false, \ 796 "Trace all call fixups") \ 797 \ 798 develop(bool, DeoptimizeALot, false, \ 799 "Deoptimize at every exit from the runtime system") \ 800 \ 801 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 802 "A comma separated list of bcis to deoptimize at") \ 803 \ 804 product(bool, DeoptimizeRandom, false, \ 805 "Deoptimize random frames on random exit from the runtime system")\ 806 \ 807 notproduct(bool, ZombieALot, false, \ 808 "Create zombies (non-entrant) at exit from the runtime system") \ 809 \ 810 product(bool, UnlinkSymbolsALot, false, \ 811 "Unlink unreferenced symbols from the symbol table at safepoints")\ 812 \ 813 notproduct(bool, WalkStackALot, false, \ 814 "Trace stack (no print) at every exit from the runtime system") \ 815 \ 816 product(bool, Debugging, false, \ 817 "Set when executing debug methods in debug.cpp " \ 818 "(to prevent triggering assertions)") \ 819 \ 820 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 821 "Enable strict checks that safepoints cannot happen for threads " \ 822 "that use NoSafepointVerifier") \ 823 \ 824 notproduct(bool, VerifyLastFrame, false, \ 825 "Verify oops on last frame on entry to VM") \ 826 \ 827 product(bool, FailOverToOldVerifier, true, \ 828 "Fail over to old verifier when split verifier fails") \ 829 \ 830 develop(bool, ShowSafepointMsgs, false, \ 831 "Show message about safepoint synchronization") \ 832 \ 833 product(bool, SafepointTimeout, false, \ 834 "Time out and warn or fail after SafepointTimeoutDelay " \ 835 "milliseconds if failed to reach safepoint") \ 836 \ 837 develop(bool, DieOnSafepointTimeout, false, \ 838 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 839 \ 840 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 841 /* typically, at most a few retries are needed */ \ 842 product(intx, SuspendRetryCount, 50, \ 843 "Maximum retry count for an external suspend request") \ 844 range(0, max_intx) \ 845 \ 846 product(intx, SuspendRetryDelay, 5, \ 847 "Milliseconds to delay per retry (* current_retry_count)") \ 848 range(0, max_intx) \ 849 \ 850 product(bool, AssertOnSuspendWaitFailure, false, \ 851 "Assert/Guarantee on external suspend wait failure") \ 852 \ 853 product(bool, TraceSuspendWaitFailures, false, \ 854 "Trace external suspend wait failures") \ 855 \ 856 product(bool, MaxFDLimit, true, \ 857 "Bump the number of file descriptors to maximum in Solaris") \ 858 \ 859 diagnostic(bool, LogEvents, true, \ 860 "Enable the various ring buffer event logs") \ 861 \ 862 diagnostic(uintx, LogEventsBufferEntries, 10, \ 863 "Number of ring buffer event logs") \ 864 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 865 \ 866 product(bool, BytecodeVerificationRemote, true, \ 867 "Enable the Java bytecode verifier for remote classes") \ 868 \ 869 product(bool, BytecodeVerificationLocal, false, \ 870 "Enable the Java bytecode verifier for local classes") \ 871 \ 872 develop(bool, ForceFloatExceptions, trueInDebug, \ 873 "Force exceptions on FP stack under/overflow") \ 874 \ 875 develop(bool, VerifyStackAtCalls, false, \ 876 "Verify that the stack pointer is unchanged after calls") \ 877 \ 878 develop(bool, TraceJavaAssertions, false, \ 879 "Trace java language assertions") \ 880 \ 881 notproduct(bool, CheckAssertionStatusDirectives, false, \ 882 "Temporary - see javaClasses.cpp") \ 883 \ 884 notproduct(bool, PrintMallocFree, false, \ 885 "Trace calls to C heap malloc/free allocation") \ 886 \ 887 notproduct(bool, VerifyCodeCache, false, \ 888 "Verify code cache on memory allocation/deallocation") \ 889 \ 890 develop(bool, UseMallocOnly, false, \ 891 "Use only malloc/free for allocation (no resource area/arena)") \ 892 \ 893 develop(bool, PrintMalloc, false, \ 894 "Print all malloc/free calls") \ 895 \ 896 develop(bool, PrintMallocStatistics, false, \ 897 "Print malloc/free statistics") \ 898 \ 899 develop(bool, ZapResourceArea, trueInDebug, \ 900 "Zap freed resource/arena space with 0xABABABAB") \ 901 \ 902 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 903 "Zap freed VM handle space with 0xBCBCBCBC") \ 904 \ 905 develop(bool, ZapJNIHandleArea, trueInDebug, \ 906 "Zap freed JNI handle space with 0xFEFEFEFE") \ 907 \ 908 notproduct(bool, ZapStackSegments, trueInDebug, \ 909 "Zap allocated/freed stack segments with 0xFADFADED") \ 910 \ 911 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 912 "Zap unused heap space with 0xBAADBABE") \ 913 \ 914 develop(bool, CheckZapUnusedHeapArea, false, \ 915 "Check zapping of unused heap space") \ 916 \ 917 develop(bool, ZapFillerObjects, trueInDebug, \ 918 "Zap filler objects with 0xDEAFBABE") \ 919 \ 920 develop(bool, PrintVMMessages, true, \ 921 "Print VM messages on console") \ 922 \ 923 notproduct(uintx, ErrorHandlerTest, 0, \ 924 "If > 0, provokes an error after VM initialization; the value " \ 925 "determines which error to provoke. See test_error_handler() " \ 926 "in debug.cpp.") \ 927 \ 928 notproduct(uintx, TestCrashInErrorHandler, 0, \ 929 "If > 0, provokes an error inside VM error handler (a secondary " \ 930 "crash). see test_error_handler() in debug.cpp.") \ 931 \ 932 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 933 "If true, tests SafeFetch inside error handler.") \ 934 \ 935 develop(bool, Verbose, false, \ 936 "Print additional debugging information from other modes") \ 937 \ 938 develop(bool, PrintMiscellaneous, false, \ 939 "Print uncategorized debugging information (requires +Verbose)") \ 940 \ 941 develop(bool, WizardMode, false, \ 942 "Print much more debugging information") \ 943 \ 944 product(bool, ShowMessageBoxOnError, false, \ 945 "Keep process alive on VM fatal error") \ 946 \ 947 product(bool, CreateCoredumpOnCrash, true, \ 948 "Create core/mini dump on VM fatal error") \ 949 \ 950 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 951 "Timeout, in seconds, to limit the time spent on writing an " \ 952 "error log in case of a crash.") \ 953 range(0, (uint64_t)max_jlong/1000) \ 954 \ 955 product_pd(bool, UseOSErrorReporting, \ 956 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 957 \ 958 product(bool, SuppressFatalErrorMessage, false, \ 959 "Report NO fatal error message (avoid deadlock)") \ 960 \ 961 product(ccstrlist, OnError, "", \ 962 "Run user-defined commands on fatal error; see VMError.cpp " \ 963 "for examples") \ 964 \ 965 product(ccstrlist, OnOutOfMemoryError, "", \ 966 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 967 \ 968 manageable(bool, HeapDumpBeforeFullGC, false, \ 969 "Dump heap to file before any major stop-the-world GC") \ 970 \ 971 manageable(bool, HeapDumpAfterFullGC, false, \ 972 "Dump heap to file after any major stop-the-world GC") \ 973 \ 974 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 975 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 976 \ 977 manageable(ccstr, HeapDumpPath, NULL, \ 978 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 979 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 980 "in the working directory)") \ 981 \ 982 develop(bool, BreakAtWarning, false, \ 983 "Execute breakpoint upon encountering VM warning") \ 984 \ 985 develop(bool, UseFakeTimers, false, \ 986 "Tell whether the VM should use system time or a fake timer") \ 987 \ 988 product(ccstr, NativeMemoryTracking, "off", \ 989 "Native memory tracking options") \ 990 \ 991 diagnostic(bool, PrintNMTStatistics, false, \ 992 "Print native memory tracking summary data if it is on") \ 993 \ 994 diagnostic(bool, LogCompilation, false, \ 995 "Log compilation activity in detail to LogFile") \ 996 \ 997 product(bool, PrintCompilation, false, \ 998 "Print compilations") \ 999 \ 1000 diagnostic(bool, TraceNMethodInstalls, false, \ 1001 "Trace nmethod installation") \ 1002 \ 1003 diagnostic(intx, ScavengeRootsInCode, 2, \ 1004 "0: do not allow scavengable oops in the code cache; " \ 1005 "1: allow scavenging from the code cache; " \ 1006 "2: emit as many constants as the compiler can see") \ 1007 range(0, 2) \ 1008 \ 1009 product(bool, AlwaysRestoreFPU, false, \ 1010 "Restore the FPU control word after every JNI call (expensive)") \ 1011 \ 1012 diagnostic(bool, PrintCompilation2, false, \ 1013 "Print additional statistics per compilation") \ 1014 \ 1015 diagnostic(bool, PrintAdapterHandlers, false, \ 1016 "Print code generated for i2c/c2i adapters") \ 1017 \ 1018 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1019 "Verify that i2c/c2i adapters are called properly") \ 1020 \ 1021 develop(bool, VerifyAdapterSharing, false, \ 1022 "Verify that the code for shared adapters is the equivalent") \ 1023 \ 1024 diagnostic(bool, PrintAssembly, false, \ 1025 "Print assembly code (using external disassembler.so)") \ 1026 \ 1027 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1028 "Print options string passed to disassembler.so") \ 1029 \ 1030 notproduct(bool, PrintNMethodStatistics, false, \ 1031 "Print a summary statistic for the generated nmethods") \ 1032 \ 1033 diagnostic(bool, PrintNMethods, false, \ 1034 "Print assembly code for nmethods when generated") \ 1035 \ 1036 diagnostic(bool, PrintNativeNMethods, false, \ 1037 "Print assembly code for native nmethods when generated") \ 1038 \ 1039 develop(bool, PrintDebugInfo, false, \ 1040 "Print debug information for all nmethods when generated") \ 1041 \ 1042 develop(bool, PrintRelocations, false, \ 1043 "Print relocation information for all nmethods when generated") \ 1044 \ 1045 develop(bool, PrintDependencies, false, \ 1046 "Print dependency information for all nmethods when generated") \ 1047 \ 1048 develop(bool, PrintExceptionHandlers, false, \ 1049 "Print exception handler tables for all nmethods when generated") \ 1050 \ 1051 develop(bool, StressCompiledExceptionHandlers, false, \ 1052 "Exercise compiled exception handlers") \ 1053 \ 1054 develop(bool, InterceptOSException, false, \ 1055 "Start debugger when an implicit OS (e.g. NULL) " \ 1056 "exception happens") \ 1057 \ 1058 product(bool, PrintCodeCache, false, \ 1059 "Print the code cache memory usage when exiting") \ 1060 \ 1061 develop(bool, PrintCodeCache2, false, \ 1062 "Print detailed usage information on the code cache when exiting")\ 1063 \ 1064 product(bool, PrintCodeCacheOnCompilation, false, \ 1065 "Print the code cache memory usage each time a method is " \ 1066 "compiled") \ 1067 \ 1068 diagnostic(bool, PrintStubCode, false, \ 1069 "Print generated stub code") \ 1070 \ 1071 product(bool, StackTraceInThrowable, true, \ 1072 "Collect backtrace in throwable when exception happens") \ 1073 \ 1074 product(bool, OmitStackTraceInFastThrow, true, \ 1075 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1076 \ 1077 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1078 "Print bytecode statistics when dumping profiler output") \ 1079 \ 1080 product(bool, ProfilerRecordPC, false, \ 1081 "Collect ticks for each 16 byte interval of compiled code") \ 1082 \ 1083 product(bool, ProfileVM, false, \ 1084 "Profile ticks that fall within VM (either in the VM Thread " \ 1085 "or VM code called through stubs)") \ 1086 \ 1087 product(bool, ProfileIntervals, false, \ 1088 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1089 \ 1090 notproduct(bool, ProfilerCheckIntervals, false, \ 1091 "Collect and print information on spacing of profiler ticks") \ 1092 \ 1093 product(bool, PrintWarnings, true, \ 1094 "Print JVM warnings to output stream") \ 1095 \ 1096 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1097 "Print warnings for stalled SpinLocks") \ 1098 \ 1099 product(bool, RegisterFinalizersAtInit, true, \ 1100 "Register finalizable objects at end of Object.<init> or " \ 1101 "after allocation") \ 1102 \ 1103 develop(bool, RegisterReferences, true, \ 1104 "Tell whether the VM should register soft/weak/final/phantom " \ 1105 "references") \ 1106 \ 1107 develop(bool, IgnoreRewrites, false, \ 1108 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1109 "This is unsafe!") \ 1110 \ 1111 develop(bool, PrintCodeCacheExtension, false, \ 1112 "Print extension of code cache") \ 1113 \ 1114 develop(bool, UsePrivilegedStack, true, \ 1115 "Enable the security JVM functions") \ 1116 \ 1117 develop(bool, ProtectionDomainVerification, true, \ 1118 "Verify protection domain before resolution in system dictionary")\ 1119 \ 1120 product(bool, ClassUnloading, true, \ 1121 "Do unloading of classes") \ 1122 \ 1123 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1124 "Do unloading of classes with a concurrent marking cycle") \ 1125 \ 1126 develop(bool, DisableStartThread, false, \ 1127 "Disable starting of additional Java threads " \ 1128 "(for debugging only)") \ 1129 \ 1130 develop(bool, MemProfiling, false, \ 1131 "Write memory usage profiling to log file") \ 1132 \ 1133 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1134 "Print the system dictionary at exit") \ 1135 \ 1136 experimental(intx, PredictedLoadedClassCount, 0, \ 1137 "Experimental: Tune loaded class cache starting size") \ 1138 \ 1139 diagnostic(bool, UnsyncloadClass, false, \ 1140 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1141 "class loader must call VM synchronized for findClass " \ 1142 "and defineClass.") \ 1143 \ 1144 product(bool, AlwaysLockClassLoader, false, \ 1145 "Require the VM to acquire the class loader lock before calling " \ 1146 "loadClass() even for class loaders registering " \ 1147 "as parallel capable") \ 1148 \ 1149 product(bool, AllowParallelDefineClass, false, \ 1150 "Allow parallel defineClass requests for class loaders " \ 1151 "registering as parallel capable") \ 1152 \ 1153 product(bool, MustCallLoadClassInternal, false, \ 1154 "Call loadClassInternal() rather than loadClass()") \ 1155 \ 1156 product_pd(bool, DontYieldALot, \ 1157 "Throw away obvious excess yield calls") \ 1158 \ 1159 product(bool, ConvertSleepToYield, true, \ 1160 "Convert sleep(0) to thread yield ") \ 1161 \ 1162 product(bool, ConvertYieldToSleep, false, \ 1163 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1164 "behavior") \ 1165 \ 1166 develop(bool, UseDetachedThreads, true, \ 1167 "Use detached threads that are recycled upon termination " \ 1168 "(for Solaris only)") \ 1169 \ 1170 product(bool, UseLWPSynchronization, true, \ 1171 "Use LWP-based instead of libthread-based synchronization " \ 1172 "(SPARC only)") \ 1173 \ 1174 experimental(ccstr, SyncKnobs, NULL, \ 1175 "(Unstable) Various monitor synchronization tunables") \ 1176 \ 1177 experimental(intx, EmitSync, 0, \ 1178 "(Unsafe, Unstable) " \ 1179 "Control emission of inline sync fast-path code") \ 1180 \ 1181 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1182 range(0, max_jint) \ 1183 \ 1184 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1185 \ 1186 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1187 "Experimental Sync flags") \ 1188 \ 1189 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1190 \ 1191 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1192 \ 1193 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1194 \ 1195 experimental(intx, hashCode, 5, \ 1196 "(Unstable) select hashCode generation algorithm") \ 1197 \ 1198 product(bool, FilterSpuriousWakeups, true, \ 1199 "When true prevents OS-level spurious, or premature, wakeups " \ 1200 "from Object.wait (Ignored for Windows)") \ 1201 \ 1202 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1203 \ 1204 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1205 \ 1206 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1207 \ 1208 develop(bool, UsePthreads, false, \ 1209 "Use pthread-based instead of libthread-based synchronization " \ 1210 "(SPARC only)") \ 1211 \ 1212 product(bool, ReduceSignalUsage, false, \ 1213 "Reduce the use of OS signals in Java and/or the VM") \ 1214 \ 1215 develop_pd(bool, ShareVtableStubs, \ 1216 "Share vtable stubs (smaller code but worse branch prediction") \ 1217 \ 1218 develop(bool, LoadLineNumberTables, true, \ 1219 "Tell whether the class file parser loads line number tables") \ 1220 \ 1221 develop(bool, LoadLocalVariableTables, true, \ 1222 "Tell whether the class file parser loads local variable tables") \ 1223 \ 1224 develop(bool, LoadLocalVariableTypeTables, true, \ 1225 "Tell whether the class file parser loads local variable type" \ 1226 "tables") \ 1227 \ 1228 product(bool, AllowUserSignalHandlers, false, \ 1229 "Do not complain if the application installs signal handlers " \ 1230 "(Solaris & Linux only)") \ 1231 \ 1232 product(bool, UseSignalChaining, true, \ 1233 "Use signal-chaining to invoke signal handlers installed " \ 1234 "by the application (Solaris & Linux only)") \ 1235 \ 1236 product(bool, AllowJNIEnvProxy, false, \ 1237 "Allow JNIEnv proxies for jdbx") \ 1238 \ 1239 product(bool, RestoreMXCSROnJNICalls, false, \ 1240 "Restore MXCSR when returning from JNI calls") \ 1241 \ 1242 product(bool, CheckJNICalls, false, \ 1243 "Verify all arguments to JNI calls") \ 1244 \ 1245 product(bool, CheckEndorsedAndExtDirs, false, \ 1246 "Verify the endorsed and extension directories are not used") \ 1247 \ 1248 product(bool, UseFastJNIAccessors, true, \ 1249 "Use optimized versions of Get<Primitive>Field") \ 1250 \ 1251 product(intx, MaxJNILocalCapacity, 65536, \ 1252 "Maximum allowable local JNI handle capacity to " \ 1253 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1254 "where <= 0 is unlimited, default: 65536") \ 1255 range(min_intx, max_intx) \ 1256 \ 1257 product(bool, EagerXrunInit, false, \ 1258 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1259 "but not all -Xrun libraries may support the state of the VM " \ 1260 "at this time") \ 1261 \ 1262 product(bool, PreserveAllAnnotations, false, \ 1263 "Preserve RuntimeInvisibleAnnotations as well " \ 1264 "as RuntimeVisibleAnnotations") \ 1265 \ 1266 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1267 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1268 \ 1269 product(bool, UseXMMForArrayCopy, false, \ 1270 "Use SSE2 MOVQ instruction for Arraycopy") \ 1271 \ 1272 product(intx, FieldsAllocationStyle, 1, \ 1273 "0 - type based with oops first, " \ 1274 "1 - with oops last, " \ 1275 "2 - oops in super and sub classes are together") \ 1276 range(0, 2) \ 1277 \ 1278 product(bool, CompactFields, true, \ 1279 "Allocate nonstatic fields in gaps between previous fields") \ 1280 \ 1281 notproduct(bool, PrintFieldLayout, false, \ 1282 "Print field layout for each class") \ 1283 \ 1284 /* Need to limit the extent of the padding to reasonable size. */\ 1285 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1286 /* aggressive prefetching, while still leaving the room for segregating */\ 1287 /* among the distinct pages. */\ 1288 product(intx, ContendedPaddingWidth, 128, \ 1289 "How many bytes to pad the fields/classes marked @Contended with")\ 1290 range(0, 8192) \ 1291 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1292 \ 1293 product(bool, EnableContended, true, \ 1294 "Enable @Contended annotation support") \ 1295 \ 1296 product(bool, RestrictContended, true, \ 1297 "Restrict @Contended to trusted classes") \ 1298 \ 1299 product(bool, UseBiasedLocking, true, \ 1300 "Enable biased locking in JVM") \ 1301 \ 1302 product(intx, BiasedLockingStartupDelay, 4000, \ 1303 "Number of milliseconds to wait before enabling biased locking") \ 1304 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1305 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1306 \ 1307 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1308 "Print statistics of biased locking in JVM") \ 1309 \ 1310 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1311 "Threshold of number of revocations per type to try to " \ 1312 "rebias all objects in the heap of that type") \ 1313 range(0, max_intx) \ 1314 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1315 \ 1316 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1317 "Threshold of number of revocations per type to permanently " \ 1318 "revoke biases of all objects in the heap of that type") \ 1319 range(0, max_intx) \ 1320 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1321 \ 1322 product(intx, BiasedLockingDecayTime, 25000, \ 1323 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1324 "type after previous bulk rebias") \ 1325 range(500, max_intx) \ 1326 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1327 \ 1328 product(bool, ExitOnOutOfMemoryError, false, \ 1329 "JVM exits on the first occurrence of an out-of-memory error") \ 1330 \ 1331 product(bool, CrashOnOutOfMemoryError, false, \ 1332 "JVM aborts, producing an error log and core/mini dump, on the " \ 1333 "first occurrence of an out-of-memory error") \ 1334 \ 1335 /* tracing */ \ 1336 \ 1337 develop(bool, StressRewriter, false, \ 1338 "Stress linktime bytecode rewriting") \ 1339 \ 1340 product(ccstr, TraceJVMTI, NULL, \ 1341 "Trace flags for JVMTI functions and events") \ 1342 \ 1343 /* This option can change an EMCP method into an obsolete method. */ \ 1344 /* This can affect tests that except specific methods to be EMCP. */ \ 1345 /* This option should be used with caution. */ \ 1346 product(bool, StressLdcRewrite, false, \ 1347 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1348 \ 1349 /* change to false by default sometime after Mustang */ \ 1350 product(bool, VerifyMergedCPBytecodes, true, \ 1351 "Verify bytecodes after RedefineClasses constant pool merging") \ 1352 \ 1353 develop(bool, TraceBytecodes, false, \ 1354 "Trace bytecode execution") \ 1355 \ 1356 develop(bool, TraceICs, false, \ 1357 "Trace inline cache changes") \ 1358 \ 1359 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1360 "Trace method invocation counter overflow") \ 1361 \ 1362 develop(bool, TraceInlineCacheClearing, false, \ 1363 "Trace clearing of inline caches in nmethods") \ 1364 \ 1365 develop(bool, TraceDependencies, false, \ 1366 "Trace dependencies") \ 1367 \ 1368 develop(bool, VerifyDependencies, trueInDebug, \ 1369 "Exercise and verify the compilation dependency mechanism") \ 1370 \ 1371 develop(bool, TraceNewOopMapGeneration, false, \ 1372 "Trace OopMapGeneration") \ 1373 \ 1374 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1375 "Trace OopMapGeneration: print detailed cell states") \ 1376 \ 1377 develop(bool, TimeOopMap, false, \ 1378 "Time calls to GenerateOopMap::compute_map() in sum") \ 1379 \ 1380 develop(bool, TimeOopMap2, false, \ 1381 "Time calls to GenerateOopMap::compute_map() individually") \ 1382 \ 1383 develop(bool, TraceOopMapRewrites, false, \ 1384 "Trace rewriting of method oops during oop map generation") \ 1385 \ 1386 develop(bool, TraceICBuffer, false, \ 1387 "Trace usage of IC buffer") \ 1388 \ 1389 develop(bool, TraceCompiledIC, false, \ 1390 "Trace changes of compiled IC") \ 1391 \ 1392 /* gc */ \ 1393 \ 1394 product(bool, UseSerialGC, false, \ 1395 "Use the Serial garbage collector") \ 1396 \ 1397 product(bool, UseG1GC, false, \ 1398 "Use the Garbage-First garbage collector") \ 1399 \ 1400 product(bool, UseParallelGC, false, \ 1401 "Use the Parallel Scavenge garbage collector") \ 1402 \ 1403 product(bool, UseParallelOldGC, false, \ 1404 "Use the Parallel Old garbage collector") \ 1405 \ 1406 product(uintx, HeapMaximumCompactionInterval, 20, \ 1407 "How often should we maximally compact the heap (not allowing " \ 1408 "any dead space)") \ 1409 range(0, max_uintx) \ 1410 \ 1411 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1412 "The collection count for the first maximum compaction") \ 1413 range(0, max_uintx) \ 1414 \ 1415 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1416 "Use maximum compaction in the Parallel Old garbage collector " \ 1417 "for a system GC") \ 1418 \ 1419 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1420 "The mean used by the parallel compact dead wood " \ 1421 "limiter (a number between 0-100)") \ 1422 range(0, 100) \ 1423 \ 1424 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1425 "The standard deviation used by the parallel compact dead wood " \ 1426 "limiter (a number between 0-100)") \ 1427 range(0, 100) \ 1428 \ 1429 product(uint, ParallelGCThreads, 0, \ 1430 "Number of parallel threads parallel gc will use") \ 1431 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1432 \ 1433 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1434 "Use semaphore synchronization for the GC Threads, " \ 1435 "instead of synchronization based on mutexes") \ 1436 \ 1437 product(bool, UseDynamicNumberOfGCThreads, false, \ 1438 "Dynamically choose the number of parallel threads " \ 1439 "parallel gc will use") \ 1440 \ 1441 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1442 "Inject thread creation failures for " \ 1443 "UseDynamicNumberOfGCThreads") \ 1444 \ 1445 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1446 "Force dynamic selection of the number of " \ 1447 "parallel threads parallel gc will use to aid debugging") \ 1448 \ 1449 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1450 "Size of heap (bytes) per GC thread used in calculating the " \ 1451 "number of GC threads") \ 1452 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1453 \ 1454 product(uint, ConcGCThreads, 0, \ 1455 "Number of threads concurrent gc will use") \ 1456 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1457 \ 1458 product(uintx, GCTaskTimeStampEntries, 200, \ 1459 "Number of time stamp entries per gc worker thread") \ 1460 range(1, max_uintx) \ 1461 \ 1462 product(bool, AlwaysTenure, false, \ 1463 "Always tenure objects in eden (ParallelGC only)") \ 1464 \ 1465 product(bool, NeverTenure, false, \ 1466 "Never tenure objects in eden, may tenure on overflow " \ 1467 "(ParallelGC only)") \ 1468 \ 1469 product(bool, ScavengeBeforeFullGC, true, \ 1470 "Scavenge youngest generation before each full GC.") \ 1471 \ 1472 product(bool, UseConcMarkSweepGC, false, \ 1473 "Use Concurrent Mark-Sweep GC in the old generation") \ 1474 \ 1475 product(bool, ExplicitGCInvokesConcurrent, false, \ 1476 "A System.gc() request invokes a concurrent collection; " \ 1477 "(effective only when using concurrent collectors)") \ 1478 \ 1479 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1480 "A System.gc() request invokes a concurrent collection and " \ 1481 "also unloads classes during such a concurrent gc cycle " \ 1482 "(effective only when UseConcMarkSweepGC)") \ 1483 \ 1484 product(bool, GCLockerInvokesConcurrent, false, \ 1485 "The exit of a JNI critical section necessitating a scavenge, " \ 1486 "also kicks off a background concurrent collection") \ 1487 \ 1488 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1489 "How much the GC can expand the eden by while the GC locker " \ 1490 "is active (as a percentage)") \ 1491 range(0, 100) \ 1492 \ 1493 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1494 "Number of times to retry allocations when " \ 1495 "blocked by the GC locker") \ 1496 range(0, max_uintx) \ 1497 \ 1498 product(bool, UseCMSBestFit, true, \ 1499 "Use CMS best fit allocation strategy") \ 1500 \ 1501 product(bool, UseParNewGC, false, \ 1502 "Use parallel threads in the new generation") \ 1503 \ 1504 product(uintx, ParallelGCBufferWastePct, 10, \ 1505 "Wasted fraction of parallel allocation buffer") \ 1506 range(0, 100) \ 1507 \ 1508 product(uintx, TargetPLABWastePct, 10, \ 1509 "Target wasted space in last buffer as percent of overall " \ 1510 "allocation") \ 1511 range(1, 100) \ 1512 \ 1513 product(uintx, PLABWeight, 75, \ 1514 "Percentage (0-100) used to weight the current sample when " \ 1515 "computing exponentially decaying average for ResizePLAB") \ 1516 range(0, 100) \ 1517 \ 1518 product(bool, ResizePLAB, true, \ 1519 "Dynamically resize (survivor space) promotion LAB's") \ 1520 \ 1521 product(int, ParGCArrayScanChunk, 50, \ 1522 "Scan a subset of object array and push remainder, if array is " \ 1523 "bigger than this") \ 1524 range(1, max_jint/3) \ 1525 \ 1526 product(bool, ParGCUseLocalOverflow, false, \ 1527 "Instead of a global overflow list, use local overflow stacks") \ 1528 \ 1529 product(bool, ParGCTrimOverflow, true, \ 1530 "Eagerly trim the local overflow lists " \ 1531 "(when ParGCUseLocalOverflow)") \ 1532 \ 1533 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1534 "Simulate work queue overflow in ParNew") \ 1535 \ 1536 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1537 "An `interval' counter that determines how frequently " \ 1538 "we simulate overflow; a smaller number increases frequency") \ 1539 \ 1540 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1541 "The desired number of objects to claim from the overflow list") \ 1542 range(0, max_uintx) \ 1543 \ 1544 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1545 "The number of strides per worker thread that we divide up the " \ 1546 "card table scanning work into") \ 1547 range(1, max_uintx) \ 1548 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1549 \ 1550 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1551 "The number of cards in each chunk of the parallel chunks used " \ 1552 "during card table scanning") \ 1553 range(1, max_intx) \ 1554 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1555 \ 1556 product(uintx, OldPLABWeight, 50, \ 1557 "Percentage (0-100) used to weight the current sample when " \ 1558 "computing exponentially decaying average for resizing " \ 1559 "OldPLABSize") \ 1560 range(0, 100) \ 1561 \ 1562 product(bool, ResizeOldPLAB, true, \ 1563 "Dynamically resize (old gen) promotion LAB's") \ 1564 \ 1565 product(size_t, CMSOldPLABMax, 1024, \ 1566 "Maximum size of CMS gen promotion LAB caches per worker " \ 1567 "per block size") \ 1568 range(1, max_uintx) \ 1569 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1570 \ 1571 product(size_t, CMSOldPLABMin, 16, \ 1572 "Minimum size of CMS gen promotion LAB caches per worker " \ 1573 "per block size") \ 1574 range(1, max_uintx) \ 1575 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1576 \ 1577 product(uintx, CMSOldPLABNumRefills, 4, \ 1578 "Nominal number of refills of CMS gen promotion LAB cache " \ 1579 "per worker per block size") \ 1580 range(1, max_uintx) \ 1581 \ 1582 product(bool, CMSOldPLABResizeQuicker, false, \ 1583 "React on-the-fly during a scavenge to a sudden " \ 1584 "change in block demand rate") \ 1585 \ 1586 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1587 "The tolerance of the phase-change detector for on-the-fly " \ 1588 "PLAB resizing during a scavenge") \ 1589 range(1, max_uintx) \ 1590 \ 1591 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1592 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1593 "during a scavenge") \ 1594 range(1, max_uintx) \ 1595 \ 1596 product(bool, AlwaysPreTouch, false, \ 1597 "Force all freshly committed pages to be pre-touched") \ 1598 \ 1599 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1600 "Per-thread chunk size for parallel memory pre-touch.") \ 1601 range(1, SIZE_MAX / 2) \ 1602 \ 1603 product_pd(size_t, CMSYoungGenPerWorker, \ 1604 "The maximum size of young gen chosen by default per GC worker " \ 1605 "thread available") \ 1606 range(1, max_uintx) \ 1607 \ 1608 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1609 "Percentage (0-100) used to add conservatism when computing the " \ 1610 "duty cycle") \ 1611 range(0, 100) \ 1612 \ 1613 product(uintx, CMSExpAvgFactor, 50, \ 1614 "Percentage (0-100) used to weight the current sample when " \ 1615 "computing exponential averages for CMS statistics") \ 1616 range(0, 100) \ 1617 \ 1618 product(uintx, CMS_FLSWeight, 75, \ 1619 "Percentage (0-100) used to weight the current sample when " \ 1620 "computing exponentially decaying averages for CMS FLS " \ 1621 "statistics") \ 1622 range(0, 100) \ 1623 \ 1624 product(uintx, CMS_FLSPadding, 1, \ 1625 "The multiple of deviation from mean to use for buffering " \ 1626 "against volatility in free list demand") \ 1627 range(0, max_juint) \ 1628 \ 1629 product(uintx, FLSCoalescePolicy, 2, \ 1630 "CMS: aggressiveness level for coalescing, increasing " \ 1631 "from 0 to 4") \ 1632 range(0, 4) \ 1633 \ 1634 product(bool, FLSAlwaysCoalesceLarge, false, \ 1635 "CMS: larger free blocks are always available for coalescing") \ 1636 \ 1637 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1638 "CMS: the smaller the percentage the greater the coalescing " \ 1639 "force") \ 1640 range(0.0, 1.0) \ 1641 \ 1642 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1643 "CMS: the factor by which to inflate estimated demand of small " \ 1644 "block sizes to prevent coalescing with an adjoining block") \ 1645 range(0.0, DBL_MAX) \ 1646 \ 1647 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1648 "CMS: the factor by which to inflate estimated demand of large " \ 1649 "block sizes to prevent coalescing with an adjoining block") \ 1650 range(0.0, DBL_MAX) \ 1651 \ 1652 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1653 "CMS: the factor by which to inflate estimated demand of small " \ 1654 "block sizes to prevent splitting to supply demand for smaller " \ 1655 "blocks") \ 1656 range(0.0, DBL_MAX) \ 1657 \ 1658 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1659 "CMS: the factor by which to inflate estimated demand of large " \ 1660 "block sizes to prevent splitting to supply demand for smaller " \ 1661 "blocks") \ 1662 range(0.0, DBL_MAX) \ 1663 \ 1664 product(bool, CMSExtrapolateSweep, false, \ 1665 "CMS: cushion for block demand during sweep") \ 1666 \ 1667 product(uintx, CMS_SweepWeight, 75, \ 1668 "Percentage (0-100) used to weight the current sample when " \ 1669 "computing exponentially decaying average for inter-sweep " \ 1670 "duration") \ 1671 range(0, 100) \ 1672 \ 1673 product(uintx, CMS_SweepPadding, 1, \ 1674 "The multiple of deviation from mean to use for buffering " \ 1675 "against volatility in inter-sweep duration") \ 1676 range(0, max_juint) \ 1677 \ 1678 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1679 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1680 "duration exceeds this threshold in milliseconds") \ 1681 range(0, max_uintx) \ 1682 \ 1683 product(bool, CMSClassUnloadingEnabled, true, \ 1684 "Whether class unloading enabled when using CMS GC") \ 1685 \ 1686 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1687 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1688 "count for which classes may not be unloaded") \ 1689 range(0, max_uintx) \ 1690 \ 1691 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1692 "Replenish an indexed free list with this number of chunks") \ 1693 range(1, max_uintx) \ 1694 \ 1695 product(bool, CMSReplenishIntermediate, true, \ 1696 "Replenish all intermediate free-list caches") \ 1697 \ 1698 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1699 "When satisfying batched demand, split blocks from the " \ 1700 "IndexedFreeList whose size is a multiple of requested size") \ 1701 \ 1702 product(bool, CMSLoopWarn, false, \ 1703 "Warn in case of excessive CMS looping") \ 1704 \ 1705 /* where does the range max value of (max_jint - 1) come from? */ \ 1706 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1707 "Maximum size of marking stack") \ 1708 range(1, (max_jint - 1)) \ 1709 \ 1710 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1711 "Size of marking stack") \ 1712 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1713 \ 1714 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1715 "Simulate frequent marking stack / work queue overflow") \ 1716 \ 1717 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1718 "An \"interval\" counter that determines how frequently " \ 1719 "to simulate overflow; a smaller number increases frequency") \ 1720 \ 1721 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1722 "Maximum number of abortable preclean iterations, if > 0") \ 1723 range(0, max_uintx) \ 1724 \ 1725 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1726 "Maximum time in abortable preclean (in milliseconds)") \ 1727 range(0, max_intx) \ 1728 \ 1729 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1730 "Nominal minimum work per abortable preclean iteration") \ 1731 range(0, max_uintx) \ 1732 \ 1733 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1734 "Time that we sleep between iterations when not given " \ 1735 "enough work per iteration") \ 1736 range(0, max_intx) \ 1737 \ 1738 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1739 product(size_t, CMSRescanMultiple, 32, \ 1740 "Size (in cards) of CMS parallel rescan task") \ 1741 range(1, SIZE_MAX / 4096) \ 1742 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1743 \ 1744 /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */ \ 1745 product(size_t, CMSConcMarkMultiple, 32, \ 1746 "Size (in cards) of CMS concurrent MT marking task") \ 1747 range(1, SIZE_MAX / 4096) \ 1748 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1749 \ 1750 product(bool, CMSAbortSemantics, false, \ 1751 "Whether abort-on-overflow semantics is implemented") \ 1752 \ 1753 product(bool, CMSParallelInitialMarkEnabled, true, \ 1754 "Use the parallel initial mark.") \ 1755 \ 1756 product(bool, CMSParallelRemarkEnabled, true, \ 1757 "Whether parallel remark enabled (only if ParNewGC)") \ 1758 \ 1759 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1760 "Whether parallel remark of survivor space " \ 1761 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1762 \ 1763 product(bool, CMSPLABRecordAlways, true, \ 1764 "Always record survivor space PLAB boundaries (effective only " \ 1765 "if CMSParallelSurvivorRemarkEnabled)") \ 1766 \ 1767 product(bool, CMSEdenChunksRecordAlways, true, \ 1768 "Always record eden chunks used for the parallel initial mark " \ 1769 "or remark of eden") \ 1770 \ 1771 product(bool, CMSConcurrentMTEnabled, true, \ 1772 "Whether multi-threaded concurrent work enabled " \ 1773 "(effective only if ParNewGC)") \ 1774 \ 1775 product(bool, CMSPrecleaningEnabled, true, \ 1776 "Whether concurrent precleaning enabled") \ 1777 \ 1778 product(uintx, CMSPrecleanIter, 3, \ 1779 "Maximum number of precleaning iteration passes") \ 1780 range(0, 9) \ 1781 \ 1782 product(uintx, CMSPrecleanDenominator, 3, \ 1783 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1784 "ratio") \ 1785 range(1, max_uintx) \ 1786 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1787 \ 1788 product(uintx, CMSPrecleanNumerator, 2, \ 1789 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1790 "ratio") \ 1791 range(0, max_uintx-1) \ 1792 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1793 \ 1794 product(bool, CMSPrecleanRefLists1, true, \ 1795 "Preclean ref lists during (initial) preclean phase") \ 1796 \ 1797 product(bool, CMSPrecleanRefLists2, false, \ 1798 "Preclean ref lists during abortable preclean phase") \ 1799 \ 1800 product(bool, CMSPrecleanSurvivors1, false, \ 1801 "Preclean survivors during (initial) preclean phase") \ 1802 \ 1803 product(bool, CMSPrecleanSurvivors2, true, \ 1804 "Preclean survivors during abortable preclean phase") \ 1805 \ 1806 product(uintx, CMSPrecleanThreshold, 1000, \ 1807 "Do not iterate again if number of dirty cards is less than this")\ 1808 range(100, max_uintx) \ 1809 \ 1810 product(bool, CMSCleanOnEnter, true, \ 1811 "Clean-on-enter optimization for reducing number of dirty cards") \ 1812 \ 1813 product(uintx, CMSRemarkVerifyVariant, 1, \ 1814 "Choose variant (1,2) of verification following remark") \ 1815 range(1, 2) \ 1816 \ 1817 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1818 "If Eden size is below this, do not try to schedule remark") \ 1819 range(0, max_uintx) \ 1820 \ 1821 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1822 "The Eden occupancy percentage (0-100) at which " \ 1823 "to try and schedule remark pause") \ 1824 range(0, 100) \ 1825 \ 1826 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1827 "Start sampling eden top at least before young gen " \ 1828 "occupancy reaches 1/<ratio> of the size at which " \ 1829 "we plan to schedule remark") \ 1830 range(1, max_uintx) \ 1831 \ 1832 product(uintx, CMSSamplingGrain, 16*K, \ 1833 "The minimum distance between eden samples for CMS (see above)") \ 1834 range(ObjectAlignmentInBytes, max_uintx) \ 1835 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1836 \ 1837 product(bool, CMSScavengeBeforeRemark, false, \ 1838 "Attempt scavenge before the CMS remark step") \ 1839 \ 1840 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1841 "Don't drain below this size per parallel worker/thief") \ 1842 range(1, max_juint) \ 1843 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1844 \ 1845 manageable(intx, CMSWaitDuration, 2000, \ 1846 "Time in milliseconds that CMS thread waits for young GC") \ 1847 range(min_jint, max_jint) \ 1848 \ 1849 develop(uintx, CMSCheckInterval, 1000, \ 1850 "Interval in milliseconds that CMS thread checks if it " \ 1851 "should start a collection cycle") \ 1852 \ 1853 product(bool, CMSYield, true, \ 1854 "Yield between steps of CMS") \ 1855 \ 1856 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1857 "Bitmap operations should process at most this many bits " \ 1858 "between yields") \ 1859 range(1, max_uintx) \ 1860 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1861 \ 1862 product(bool, CMSPrintChunksInDump, false, \ 1863 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1864 "trace level include more detailed information about the" \ 1865 "free chunks") \ 1866 \ 1867 product(bool, CMSPrintObjectsInDump, false, \ 1868 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1869 "trace level include more detailed information about the" \ 1870 "allocated objects") \ 1871 \ 1872 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1873 "Verify that all references across the FLS boundary " \ 1874 "are to valid objects") \ 1875 \ 1876 diagnostic(bool, FLSVerifyLists, false, \ 1877 "Do lots of (expensive) FreeListSpace verification") \ 1878 \ 1879 diagnostic(bool, FLSVerifyIndexTable, false, \ 1880 "Do lots of (expensive) FLS index table verification") \ 1881 \ 1882 develop(bool, FLSVerifyDictionary, false, \ 1883 "Do lots of (expensive) FLS dictionary verification") \ 1884 \ 1885 develop(bool, VerifyBlockOffsetArray, false, \ 1886 "Do (expensive) block offset array verification") \ 1887 \ 1888 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1889 "Maintain _unallocated_block in BlockOffsetArray " \ 1890 "(currently applicable only to CMS collector)") \ 1891 \ 1892 product(intx, RefDiscoveryPolicy, 0, \ 1893 "Select type of reference discovery policy: " \ 1894 "reference-based(0) or referent-based(1)") \ 1895 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1896 ReferenceProcessor::DiscoveryPolicyMax) \ 1897 \ 1898 product(bool, ParallelRefProcEnabled, false, \ 1899 "Enable parallel reference processing whenever possible") \ 1900 \ 1901 product(bool, ParallelRefProcBalancingEnabled, true, \ 1902 "Enable balancing of reference processing queues") \ 1903 \ 1904 product(uintx, CMSTriggerRatio, 80, \ 1905 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1906 "allocated before a CMS collection cycle commences") \ 1907 range(0, 100) \ 1908 \ 1909 product(uintx, CMSBootstrapOccupancy, 50, \ 1910 "Percentage CMS generation occupancy at which to " \ 1911 "initiate CMS collection for bootstrapping collection stats") \ 1912 range(0, 100) \ 1913 \ 1914 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1915 "Percentage CMS generation occupancy to start a CMS collection " \ 1916 "cycle. A negative value means that CMSTriggerRatio is used") \ 1917 range(min_intx, 100) \ 1918 \ 1919 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1920 "The percent occupancy (IHOP) of the current old generation " \ 1921 "capacity above which a concurrent mark cycle will be initiated " \ 1922 "Its value may change over time if adaptive IHOP is enabled, " \ 1923 "otherwise the value remains constant. " \ 1924 "In the latter case a value of 0 will result as frequent as " \ 1925 "possible concurrent marking cycles. A value of 100 disables " \ 1926 "concurrent marking. " \ 1927 "Fragmentation waste in the old generation is not considered " \ 1928 "free space in this calculation. (G1 collector only)") \ 1929 range(0, 100) \ 1930 \ 1931 manageable(intx, CMSTriggerInterval, -1, \ 1932 "Commence a CMS collection cycle (at least) every so many " \ 1933 "milliseconds (0 permanently, -1 disabled)") \ 1934 range(-1, max_intx) \ 1935 \ 1936 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1937 "Only use occupancy as a criterion for starting a CMS collection")\ 1938 \ 1939 product(uintx, CMSIsTooFullPercentage, 98, \ 1940 "An absolute ceiling above which CMS will always consider the " \ 1941 "unloading of classes when class unloading is enabled") \ 1942 range(0, 100) \ 1943 \ 1944 develop(bool, CMSTestInFreeList, false, \ 1945 "Check if the coalesced range is already in the " \ 1946 "free lists as claimed") \ 1947 \ 1948 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1949 "Check that all the garbage collected was returned to the " \ 1950 "free lists") \ 1951 \ 1952 notproduct(bool, ScavengeALot, false, \ 1953 "Force scavenge at every Nth exit from the runtime system " \ 1954 "(N=ScavengeALotInterval)") \ 1955 \ 1956 develop(bool, FullGCALot, false, \ 1957 "Force full gc at every Nth exit from the runtime system " \ 1958 "(N=FullGCALotInterval)") \ 1959 \ 1960 notproduct(bool, GCALotAtAllSafepoints, false, \ 1961 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1962 \ 1963 notproduct(bool, PromotionFailureALot, false, \ 1964 "Use promotion failure handling on every youngest generation " \ 1965 "collection") \ 1966 \ 1967 develop(uintx, PromotionFailureALotCount, 1000, \ 1968 "Number of promotion failures occurring at PLAB " \ 1969 "refill attempts (ParNew) or promotion attempts " \ 1970 "(other young collectors)") \ 1971 \ 1972 develop(uintx, PromotionFailureALotInterval, 5, \ 1973 "Total collections between promotion failures a lot") \ 1974 \ 1975 experimental(uintx, WorkStealingSleepMillis, 1, \ 1976 "Sleep time when sleep is used for yields") \ 1977 \ 1978 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1979 "Number of yields before a sleep is done during work stealing") \ 1980 \ 1981 experimental(uintx, WorkStealingHardSpins, 4096, \ 1982 "Number of iterations in a spin loop between checks on " \ 1983 "time out of hard spin") \ 1984 \ 1985 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1986 "Ratio of hard spins to calls to yield") \ 1987 \ 1988 develop(uintx, ObjArrayMarkingStride, 512, \ 1989 "Number of object array elements to push onto the marking stack " \ 1990 "before pushing a continuation entry") \ 1991 \ 1992 develop(bool, MetadataAllocationFailALot, false, \ 1993 "Fail metadata allocations at intervals controlled by " \ 1994 "MetadataAllocationFailALotInterval") \ 1995 \ 1996 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1997 "Metadata allocation failure a lot interval") \ 1998 \ 1999 notproduct(bool, ExecuteInternalVMTests, false, \ 2000 "Enable execution of internal VM tests") \ 2001 \ 2002 notproduct(bool, VerboseInternalVMTests, false, \ 2003 "Turn on logging for internal VM tests.") \ 2004 \ 2005 product(bool, ExecutingUnitTests, false, \ 2006 "Whether the JVM is running unit tests or not") \ 2007 \ 2008 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2009 \ 2010 product_pd(bool, ResizeTLAB, \ 2011 "Dynamically resize TLAB size for threads") \ 2012 \ 2013 product(bool, ZeroTLAB, false, \ 2014 "Zero out the newly created TLAB") \ 2015 \ 2016 product(bool, FastTLABRefill, true, \ 2017 "Use fast TLAB refill code") \ 2018 \ 2019 product(bool, TLABStats, true, \ 2020 "Provide more detailed and expensive TLAB statistics.") \ 2021 \ 2022 product_pd(bool, NeverActAsServerClassMachine, \ 2023 "Never act like a server-class machine") \ 2024 \ 2025 product(bool, AlwaysActAsServerClassMachine, false, \ 2026 "Always act like a server-class machine") \ 2027 \ 2028 product_pd(uint64_t, MaxRAM, \ 2029 "Real memory size (in bytes) used to set maximum heap size") \ 2030 range(0, 0XFFFFFFFFFFFFFFFF) \ 2031 \ 2032 product(size_t, ErgoHeapSizeLimit, 0, \ 2033 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2034 "MaxRAM / MaxRAMFraction") \ 2035 range(0, max_uintx) \ 2036 \ 2037 product(uintx, MaxRAMFraction, 4, \ 2038 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2039 "size") \ 2040 range(1, max_uintx) \ 2041 \ 2042 product(uintx, MinRAMFraction, 2, \ 2043 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2044 "size on systems with small physical memory size") \ 2045 range(1, max_uintx) \ 2046 \ 2047 product(uintx, InitialRAMFraction, 64, \ 2048 "Fraction (1/n) of real memory used for initial heap size") \ 2049 range(1, max_uintx) \ 2050 \ 2051 develop(uintx, MaxVirtMemFraction, 2, \ 2052 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2053 "determining maximum heap size") \ 2054 \ 2055 product(bool, UseAutoGCSelectPolicy, false, \ 2056 "Use automatic collection selection policy") \ 2057 \ 2058 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2059 "Automatic GC selection pause threshold in milliseconds") \ 2060 range(0, max_uintx) \ 2061 \ 2062 product(bool, UseAdaptiveSizePolicy, true, \ 2063 "Use adaptive generation sizing policies") \ 2064 \ 2065 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2066 "Use adaptive survivor sizing policies") \ 2067 \ 2068 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2069 "Use adaptive young-old sizing policies at minor collections") \ 2070 \ 2071 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2072 "Use adaptive young-old sizing policies at major collections") \ 2073 \ 2074 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2075 "Include statistics from System.gc() for adaptive size policy") \ 2076 \ 2077 product(bool, UseAdaptiveGCBoundary, false, \ 2078 "Allow young-old boundary to move") \ 2079 \ 2080 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2081 "Resize the virtual spaces of the young or old generations") \ 2082 range(-1, 1) \ 2083 \ 2084 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2085 "Policy for changing generation size for throughput goals") \ 2086 range(0, 1) \ 2087 \ 2088 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2089 "Number of steps where heuristics is used before data is used") \ 2090 range(0, max_uintx) \ 2091 \ 2092 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2093 "Number of collections before the adaptive sizing is started") \ 2094 \ 2095 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2096 "Collection interval for printing information; zero means never") \ 2097 range(0, max_uintx) \ 2098 \ 2099 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2100 "Use adaptive minimum footprint as a goal") \ 2101 \ 2102 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2103 "Weight given to exponential resizing, between 0 and 100") \ 2104 range(0, 100) \ 2105 \ 2106 product(uintx, AdaptiveTimeWeight, 25, \ 2107 "Weight given to time in adaptive policy, between 0 and 100") \ 2108 range(0, 100) \ 2109 \ 2110 product(uintx, PausePadding, 1, \ 2111 "How much buffer to keep for pause time") \ 2112 range(0, max_juint) \ 2113 \ 2114 product(uintx, PromotedPadding, 3, \ 2115 "How much buffer to keep for promotion failure") \ 2116 range(0, max_juint) \ 2117 \ 2118 product(uintx, SurvivorPadding, 3, \ 2119 "How much buffer to keep for survivor overflow") \ 2120 range(0, max_juint) \ 2121 \ 2122 product(uintx, ThresholdTolerance, 10, \ 2123 "Allowed collection cost difference between generations") \ 2124 range(0, 100) \ 2125 \ 2126 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2127 "If collection costs are within margin, reduce both by full " \ 2128 "delta") \ 2129 range(0, 100) \ 2130 \ 2131 product(uintx, YoungGenerationSizeIncrement, 20, \ 2132 "Adaptive size percentage change in young generation") \ 2133 range(0, 100) \ 2134 \ 2135 product(uintx, YoungGenerationSizeSupplement, 80, \ 2136 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2137 range(0, 100) \ 2138 \ 2139 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2140 "Decay factor to YoungedGenerationSizeSupplement") \ 2141 range(1, max_uintx) \ 2142 \ 2143 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2144 "Adaptive size percentage change in tenured generation") \ 2145 range(0, 100) \ 2146 \ 2147 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2148 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2149 range(0, 100) \ 2150 \ 2151 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2152 "Decay factor to TenuredGenerationSizeIncrement") \ 2153 range(1, max_uintx) \ 2154 \ 2155 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2156 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2157 "or (G1 Only) the maximum GC time per MMU time slice") \ 2158 range(1, max_uintx - 1) \ 2159 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2160 \ 2161 product(uintx, GCPauseIntervalMillis, 0, \ 2162 "Time slice for MMU specification") \ 2163 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2164 \ 2165 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2166 "Adaptive size policy maximum GC minor pause time goal " \ 2167 "in millisecond") \ 2168 range(0, max_uintx) \ 2169 \ 2170 product(uintx, GCTimeRatio, 99, \ 2171 "Adaptive size policy application time to GC time ratio") \ 2172 range(0, max_juint) \ 2173 \ 2174 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2175 "Adaptive size scale down factor for shrinking") \ 2176 range(1, max_uintx) \ 2177 \ 2178 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2179 "Adaptive size decays the major cost for long major intervals") \ 2180 \ 2181 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2182 "Time scale over which major costs decay") \ 2183 range(0, max_uintx) \ 2184 \ 2185 product(uintx, MinSurvivorRatio, 3, \ 2186 "Minimum ratio of young generation/survivor space size") \ 2187 range(3, max_uintx) \ 2188 \ 2189 product(uintx, InitialSurvivorRatio, 8, \ 2190 "Initial ratio of young generation/survivor space size") \ 2191 range(0, max_uintx) \ 2192 \ 2193 product(size_t, BaseFootPrintEstimate, 256*M, \ 2194 "Estimate of footprint other than Java Heap") \ 2195 range(0, max_uintx) \ 2196 \ 2197 product(bool, UseGCOverheadLimit, true, \ 2198 "Use policy to limit of proportion of time spent in GC " \ 2199 "before an OutOfMemory error is thrown") \ 2200 \ 2201 product(uintx, GCTimeLimit, 98, \ 2202 "Limit of the proportion of time spent in GC before " \ 2203 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2204 range(0, 100) \ 2205 \ 2206 product(uintx, GCHeapFreeLimit, 2, \ 2207 "Minimum percentage of free space after a full GC before an " \ 2208 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2209 range(0, 100) \ 2210 \ 2211 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2212 "Number of consecutive collections before gc time limit fires") \ 2213 range(1, max_uintx) \ 2214 \ 2215 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2216 "How far ahead to prefetch destination area (<= 0 means off)") \ 2217 range(-1, max_jint) \ 2218 \ 2219 product(intx, PrefetchScanIntervalInBytes, -1, \ 2220 "How far ahead to prefetch scan area (<= 0 means off)") \ 2221 range(-1, max_jint) \ 2222 \ 2223 product(intx, PrefetchFieldsAhead, -1, \ 2224 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2225 range(-1, max_jint) \ 2226 \ 2227 diagnostic(bool, VerifyDuringStartup, false, \ 2228 "Verify memory system before executing any Java code " \ 2229 "during VM initialization") \ 2230 \ 2231 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2232 "Verify system before exiting") \ 2233 \ 2234 diagnostic(bool, VerifyBeforeGC, false, \ 2235 "Verify memory system before GC") \ 2236 \ 2237 diagnostic(bool, VerifyAfterGC, false, \ 2238 "Verify memory system after GC") \ 2239 \ 2240 diagnostic(bool, VerifyDuringGC, false, \ 2241 "Verify memory system during GC (between phases)") \ 2242 \ 2243 diagnostic(ccstrlist, VerifySubSet, "", \ 2244 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2245 "are enabled. One or more sub-systems can be specified " \ 2246 "in a comma separated string. Sub-systems are: " \ 2247 "threads, heap, symbol_table, string_table, codecache, " \ 2248 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2249 "codecache_oops") \ 2250 \ 2251 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2252 "Enable parallel memory system verification") \ 2253 \ 2254 diagnostic(bool, DeferInitialCardMark, false, \ 2255 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2256 "may arise from new_pre_store_barrier") \ 2257 \ 2258 product(bool, UseCondCardMark, false, \ 2259 "Check for already marked card before updating card table") \ 2260 \ 2261 diagnostic(bool, VerifyRememberedSets, false, \ 2262 "Verify GC remembered sets") \ 2263 \ 2264 diagnostic(bool, VerifyObjectStartArray, true, \ 2265 "Verify GC object start array if verify before/after") \ 2266 \ 2267 product(bool, DisableExplicitGC, false, \ 2268 "Ignore calls to System.gc()") \ 2269 \ 2270 notproduct(bool, CheckMemoryInitialization, false, \ 2271 "Check memory initialization") \ 2272 \ 2273 diagnostic(bool, BindCMSThreadToCPU, false, \ 2274 "Bind CMS Thread to CPU if possible") \ 2275 \ 2276 diagnostic(uintx, CPUForCMSThread, 0, \ 2277 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2278 range(0, max_juint) \ 2279 \ 2280 product(bool, BindGCTaskThreadsToCPUs, false, \ 2281 "Bind GCTaskThreads to CPUs if possible") \ 2282 \ 2283 product(bool, UseGCTaskAffinity, false, \ 2284 "Use worker affinity when asking for GCTasks") \ 2285 \ 2286 product(uintx, ProcessDistributionStride, 4, \ 2287 "Stride through processors when distributing processes") \ 2288 range(0, max_juint) \ 2289 \ 2290 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2291 "Number of times the coordinator GC thread will sleep while " \ 2292 "yielding before giving up and resuming GC") \ 2293 range(0, max_juint) \ 2294 \ 2295 product(uintx, CMSYieldSleepCount, 0, \ 2296 "Number of times a GC thread (minus the coordinator) " \ 2297 "will sleep while yielding before giving up and resuming GC") \ 2298 range(0, max_juint) \ 2299 \ 2300 product(bool, PrintGC, false, \ 2301 "Print message at garbage collection. " \ 2302 "Deprecated, use -Xlog:gc instead.") \ 2303 \ 2304 product(bool, PrintGCDetails, false, \ 2305 "Print more details at garbage collection. " \ 2306 "Deprecated, use -Xlog:gc* instead.") \ 2307 \ 2308 develop(intx, ConcGCYieldTimeout, 0, \ 2309 "If non-zero, assert that GC threads yield within this " \ 2310 "number of milliseconds") \ 2311 range(0, max_intx) \ 2312 \ 2313 develop(bool, TraceFinalizerRegistration, false, \ 2314 "Trace registration of final references") \ 2315 \ 2316 notproduct(bool, TraceScavenge, false, \ 2317 "Trace scavenge") \ 2318 \ 2319 product(bool, IgnoreEmptyClassPaths, false, \ 2320 "Ignore empty path elements in -classpath") \ 2321 \ 2322 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2323 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2324 "Initial size of the boot class loader data metaspace") \ 2325 range(30*K, max_uintx/BytesPerWord) \ 2326 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2327 \ 2328 product(bool, TraceYoungGenTime, false, \ 2329 "Trace accumulated time for young collection") \ 2330 \ 2331 product(bool, TraceOldGenTime, false, \ 2332 "Trace accumulated time for old collection") \ 2333 \ 2334 product(bool, PrintHeapAtSIGBREAK, true, \ 2335 "Print heap layout in response to SIGBREAK") \ 2336 \ 2337 manageable(bool, PrintClassHistogram, false, \ 2338 "Print a histogram of class instances") \ 2339 \ 2340 develop(bool, TraceGCTaskManager, false, \ 2341 "Trace actions of the GC task manager") \ 2342 \ 2343 develop(bool, TraceGCTaskQueue, false, \ 2344 "Trace actions of the GC task queues") \ 2345 \ 2346 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2347 "Trace marking phase in ParallelOldGC") \ 2348 \ 2349 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2350 "Trace dense prefix computation for ParallelOldGC") \ 2351 \ 2352 develop(bool, IgnoreLibthreadGPFault, false, \ 2353 "Suppress workaround for libthread GP fault") \ 2354 \ 2355 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2356 "The percentage of the used heap that the instances of a class " \ 2357 "must occupy for the class to generate a trace event") \ 2358 range(0.0, 100.0) \ 2359 \ 2360 /* JVMTI heap profiling */ \ 2361 \ 2362 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2363 "Trace JVMTI object tagging calls") \ 2364 \ 2365 diagnostic(bool, VerifyBeforeIteration, false, \ 2366 "Verify memory system before JVMTI iteration") \ 2367 \ 2368 /* compiler interface */ \ 2369 \ 2370 develop(bool, CIPrintCompilerName, false, \ 2371 "when CIPrint is active, print the name of the active compiler") \ 2372 \ 2373 diagnostic(bool, CIPrintCompileQueue, false, \ 2374 "display the contents of the compile queue whenever a " \ 2375 "compilation is enqueued") \ 2376 \ 2377 develop(bool, CIPrintRequests, false, \ 2378 "display every request for compilation") \ 2379 \ 2380 product(bool, CITime, false, \ 2381 "collect timing information for compilation") \ 2382 \ 2383 develop(bool, CITimeVerbose, false, \ 2384 "be more verbose in compilation timings") \ 2385 \ 2386 develop(bool, CITimeEach, false, \ 2387 "display timing information after each successful compilation") \ 2388 \ 2389 develop(bool, CICountOSR, false, \ 2390 "use a separate counter when assigning ids to osr compilations") \ 2391 \ 2392 develop(bool, CICompileNatives, true, \ 2393 "compile native methods if supported by the compiler") \ 2394 \ 2395 develop_pd(bool, CICompileOSR, \ 2396 "compile on stack replacement methods if supported by the " \ 2397 "compiler") \ 2398 \ 2399 develop(bool, CIPrintMethodCodes, false, \ 2400 "print method bytecodes of the compiled code") \ 2401 \ 2402 develop(bool, CIPrintTypeFlow, false, \ 2403 "print the results of ciTypeFlow analysis") \ 2404 \ 2405 develop(bool, CITraceTypeFlow, false, \ 2406 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2407 \ 2408 develop(intx, OSROnlyBCI, -1, \ 2409 "OSR only at this bci. Negative values mean exclude that bci") \ 2410 \ 2411 /* compiler */ \ 2412 \ 2413 /* notice: the max range value here is max_jint, not max_intx */ \ 2414 /* because of overflow issue */ \ 2415 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2416 "Number of compiler threads to run") \ 2417 range(0, max_jint) \ 2418 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2419 \ 2420 product(intx, CompilationPolicyChoice, 0, \ 2421 "which compilation policy (0-3)") \ 2422 range(0, 3) \ 2423 \ 2424 develop(bool, UseStackBanging, true, \ 2425 "use stack banging for stack overflow checks (required for " \ 2426 "proper StackOverflow handling; disable only to measure cost " \ 2427 "of stackbanging)") \ 2428 \ 2429 develop(bool, UseStrictFP, true, \ 2430 "use strict fp if modifier strictfp is set") \ 2431 \ 2432 develop(bool, GenerateSynchronizationCode, true, \ 2433 "generate locking/unlocking code for synchronized methods and " \ 2434 "monitors") \ 2435 \ 2436 develop(bool, GenerateRangeChecks, true, \ 2437 "Generate range checks for array accesses") \ 2438 \ 2439 diagnostic_pd(bool, ImplicitNullChecks, \ 2440 "Generate code for implicit null checks") \ 2441 \ 2442 product_pd(bool, TrapBasedNullChecks, \ 2443 "Generate code for null checks that uses a cmp and trap " \ 2444 "instruction raising SIGTRAP. This is only used if an access to" \ 2445 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2446 "ImplicitNullChecks don't work (PPC64).") \ 2447 \ 2448 product(bool, PrintSafepointStatistics, false, \ 2449 "Print statistics about safepoint synchronization") \ 2450 \ 2451 product(intx, PrintSafepointStatisticsCount, 300, \ 2452 "Total number of safepoint statistics collected " \ 2453 "before printing them out") \ 2454 range(1, max_intx) \ 2455 \ 2456 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2457 "Print safepoint statistics only when safepoint takes " \ 2458 "more than PrintSafepointSatisticsTimeout in millis") \ 2459 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2460 NOT_LP64(range(-1, max_intx)) \ 2461 \ 2462 product(bool, Inline, true, \ 2463 "Enable inlining") \ 2464 \ 2465 product(bool, ClipInlining, true, \ 2466 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2467 \ 2468 develop(bool, UseCHA, true, \ 2469 "Enable CHA") \ 2470 \ 2471 product(bool, UseTypeProfile, true, \ 2472 "Check interpreter profile for historically monomorphic calls") \ 2473 \ 2474 diagnostic(bool, PrintInlining, false, \ 2475 "Print inlining optimizations") \ 2476 \ 2477 product(bool, UsePopCountInstruction, false, \ 2478 "Use population count instruction") \ 2479 \ 2480 develop(bool, EagerInitialization, false, \ 2481 "Eagerly initialize classes if possible") \ 2482 \ 2483 diagnostic(bool, LogTouchedMethods, false, \ 2484 "Log methods which have been ever touched in runtime") \ 2485 \ 2486 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2487 "Print all methods that have been ever touched in runtime") \ 2488 \ 2489 develop(bool, TraceMethodReplacement, false, \ 2490 "Print when methods are replaced do to recompilation") \ 2491 \ 2492 develop(bool, PrintMethodFlushing, false, \ 2493 "Print the nmethods being flushed") \ 2494 \ 2495 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2496 "print statistics about method flushing") \ 2497 \ 2498 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2499 "Number of compiled code invocations after which " \ 2500 "the method is considered as hot by the flusher") \ 2501 range(1, max_jint) \ 2502 \ 2503 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2504 "Minimum number of sweeper passes before an nmethod " \ 2505 "can be flushed") \ 2506 range(0, max_intx) \ 2507 \ 2508 product(bool, UseCodeAging, true, \ 2509 "Insert counter to detect warm methods") \ 2510 \ 2511 diagnostic(bool, StressCodeAging, false, \ 2512 "Start with counters compiled in") \ 2513 \ 2514 develop(bool, UseRelocIndex, false, \ 2515 "Use an index to speed random access to relocations") \ 2516 \ 2517 develop(bool, StressCodeBuffers, false, \ 2518 "Exercise code buffer expansion and other rare state changes") \ 2519 \ 2520 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2521 "Generate extra debugging information for non-safepoints in " \ 2522 "nmethods") \ 2523 \ 2524 product(bool, PrintVMOptions, false, \ 2525 "Print flags that appeared on the command line") \ 2526 \ 2527 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2528 "Ignore unrecognized VM options") \ 2529 \ 2530 product(bool, PrintCommandLineFlags, false, \ 2531 "Print flags specified on command line or set by ergonomics") \ 2532 \ 2533 product(bool, PrintFlagsInitial, false, \ 2534 "Print all VM flags before argument processing and exit VM") \ 2535 \ 2536 product(bool, PrintFlagsFinal, false, \ 2537 "Print all VM flags after argument and ergonomic processing") \ 2538 \ 2539 notproduct(bool, PrintFlagsWithComments, false, \ 2540 "Print all VM flags with default values and descriptions and " \ 2541 "exit") \ 2542 \ 2543 product(bool, PrintFlagsRanges, false, \ 2544 "Print VM flags and their ranges and exit VM") \ 2545 \ 2546 diagnostic(bool, SerializeVMOutput, true, \ 2547 "Use a mutex to serialize output to tty and LogFile") \ 2548 \ 2549 diagnostic(bool, DisplayVMOutput, true, \ 2550 "Display all VM output on the tty, independently of LogVMOutput") \ 2551 \ 2552 diagnostic(bool, LogVMOutput, false, \ 2553 "Save VM output to LogFile") \ 2554 \ 2555 diagnostic(ccstr, LogFile, NULL, \ 2556 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2557 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2558 \ 2559 product(ccstr, ErrorFile, NULL, \ 2560 "If an error occurs, save the error data to this file " \ 2561 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2562 \ 2563 product(bool, DisplayVMOutputToStderr, false, \ 2564 "If DisplayVMOutput is true, display all VM output to stderr") \ 2565 \ 2566 product(bool, DisplayVMOutputToStdout, false, \ 2567 "If DisplayVMOutput is true, display all VM output to stdout") \ 2568 \ 2569 product(bool, UseHeavyMonitors, false, \ 2570 "use heavyweight instead of lightweight Java monitors") \ 2571 \ 2572 product(bool, PrintStringTableStatistics, false, \ 2573 "print statistics about the StringTable and SymbolTable") \ 2574 \ 2575 diagnostic(bool, VerifyStringTableAtExit, false, \ 2576 "verify StringTable contents at exit") \ 2577 \ 2578 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2579 "print histogram of the symbol table") \ 2580 \ 2581 notproduct(bool, ExitVMOnVerifyError, false, \ 2582 "standard exit from VM if bytecode verify error " \ 2583 "(only in debug mode)") \ 2584 \ 2585 diagnostic(ccstr, AbortVMOnException, NULL, \ 2586 "Call fatal if this exception is thrown. Example: " \ 2587 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2588 \ 2589 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2590 "Call fatal if the exception pointed by AbortVMOnException " \ 2591 "has this message") \ 2592 \ 2593 develop(bool, DebugVtables, false, \ 2594 "add debugging code to vtable dispatch") \ 2595 \ 2596 notproduct(bool, PrintVtableStats, false, \ 2597 "print vtables stats at end of run") \ 2598 \ 2599 develop(bool, TraceCreateZombies, false, \ 2600 "trace creation of zombie nmethods") \ 2601 \ 2602 notproduct(bool, IgnoreLockingAssertions, false, \ 2603 "disable locking assertions (for speed)") \ 2604 \ 2605 product(bool, RangeCheckElimination, true, \ 2606 "Eliminate range checks") \ 2607 \ 2608 develop_pd(bool, UncommonNullCast, \ 2609 "track occurrences of null in casts; adjust compiler tactics") \ 2610 \ 2611 develop(bool, TypeProfileCasts, true, \ 2612 "treat casts like calls for purposes of type profiling") \ 2613 \ 2614 develop(bool, DelayCompilationDuringStartup, true, \ 2615 "Delay invoking the compiler until main application class is " \ 2616 "loaded") \ 2617 \ 2618 develop(bool, CompileTheWorld, false, \ 2619 "Compile all methods in all classes in bootstrap class path " \ 2620 "(stress test)") \ 2621 \ 2622 develop(bool, CompileTheWorldPreloadClasses, true, \ 2623 "Preload all classes used by a class before start loading") \ 2624 \ 2625 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2626 "Force a safepoint every n compiles so sweeper can keep up") \ 2627 \ 2628 develop(bool, FillDelaySlots, true, \ 2629 "Fill delay slots (on SPARC only)") \ 2630 \ 2631 develop(bool, TimeLivenessAnalysis, false, \ 2632 "Time computation of bytecode liveness analysis") \ 2633 \ 2634 develop(bool, TraceLivenessGen, false, \ 2635 "Trace the generation of liveness analysis information") \ 2636 \ 2637 notproduct(bool, TraceLivenessQuery, false, \ 2638 "Trace queries of liveness analysis information") \ 2639 \ 2640 notproduct(bool, CollectIndexSetStatistics, false, \ 2641 "Collect information about IndexSets") \ 2642 \ 2643 develop(bool, UseLoopSafepoints, true, \ 2644 "Generate Safepoint nodes in every loop") \ 2645 \ 2646 develop(intx, FastAllocateSizeLimit, 128*K, \ 2647 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2648 "Inline allocations larger than this in doublewords must go slow")\ 2649 \ 2650 product(bool, AggressiveOpts, false, \ 2651 "Enable aggressive optimizations - see arguments.cpp") \ 2652 \ 2653 product_pd(bool, CompactStrings, \ 2654 "Enable Strings to use single byte chars in backing store") \ 2655 \ 2656 product_pd(uintx, TypeProfileLevel, \ 2657 "=XYZ, with Z: Type profiling of arguments at call; " \ 2658 "Y: Type profiling of return value at call; " \ 2659 "X: Type profiling of parameters to methods; " \ 2660 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2661 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2662 \ 2663 product(intx, TypeProfileArgsLimit, 2, \ 2664 "max number of call arguments to consider for type profiling") \ 2665 range(0, 16) \ 2666 \ 2667 product(intx, TypeProfileParmsLimit, 2, \ 2668 "max number of incoming parameters to consider for type profiling"\ 2669 ", -1 for all") \ 2670 range(-1, 64) \ 2671 \ 2672 /* statistics */ \ 2673 develop(bool, CountCompiledCalls, false, \ 2674 "Count method invocations") \ 2675 \ 2676 notproduct(bool, CountRuntimeCalls, false, \ 2677 "Count VM runtime calls") \ 2678 \ 2679 develop(bool, CountJNICalls, false, \ 2680 "Count jni method invocations") \ 2681 \ 2682 notproduct(bool, CountJVMCalls, false, \ 2683 "Count jvm method invocations") \ 2684 \ 2685 notproduct(bool, CountRemovableExceptions, false, \ 2686 "Count exceptions that could be replaced by branches due to " \ 2687 "inlining") \ 2688 \ 2689 notproduct(bool, ICMissHistogram, false, \ 2690 "Produce histogram of IC misses") \ 2691 \ 2692 /* interpreter */ \ 2693 product_pd(bool, RewriteBytecodes, \ 2694 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2695 \ 2696 product_pd(bool, RewriteFrequentPairs, \ 2697 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2698 \ 2699 diagnostic(bool, PrintInterpreter, false, \ 2700 "Print the generated interpreter code") \ 2701 \ 2702 product(bool, UseInterpreter, true, \ 2703 "Use interpreter for non-compiled methods") \ 2704 \ 2705 develop(bool, UseFastSignatureHandlers, true, \ 2706 "Use fast signature handlers for native calls") \ 2707 \ 2708 product(bool, UseLoopCounter, true, \ 2709 "Increment invocation counter on backward branch") \ 2710 \ 2711 product_pd(bool, UseOnStackReplacement, \ 2712 "Use on stack replacement, calls runtime if invoc. counter " \ 2713 "overflows in loop") \ 2714 \ 2715 notproduct(bool, TraceOnStackReplacement, false, \ 2716 "Trace on stack replacement") \ 2717 \ 2718 product_pd(bool, PreferInterpreterNativeStubs, \ 2719 "Use always interpreter stubs for native methods invoked via " \ 2720 "interpreter") \ 2721 \ 2722 develop(bool, CountBytecodes, false, \ 2723 "Count number of bytecodes executed") \ 2724 \ 2725 develop(bool, PrintBytecodeHistogram, false, \ 2726 "Print histogram of the executed bytecodes") \ 2727 \ 2728 develop(bool, PrintBytecodePairHistogram, false, \ 2729 "Print histogram of the executed bytecode pairs") \ 2730 \ 2731 diagnostic(bool, PrintSignatureHandlers, false, \ 2732 "Print code generated for native method signature handlers") \ 2733 \ 2734 develop(bool, VerifyOops, false, \ 2735 "Do plausibility checks for oops") \ 2736 \ 2737 develop(bool, CheckUnhandledOops, false, \ 2738 "Check for unhandled oops in VM code") \ 2739 \ 2740 develop(bool, VerifyJNIFields, trueInDebug, \ 2741 "Verify jfieldIDs for instance fields") \ 2742 \ 2743 notproduct(bool, VerifyJNIEnvThread, false, \ 2744 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2745 "from JNI") \ 2746 \ 2747 develop(bool, VerifyFPU, false, \ 2748 "Verify FPU state (check for NaN's, etc.)") \ 2749 \ 2750 develop(bool, VerifyThread, false, \ 2751 "Watch the thread register for corruption (SPARC only)") \ 2752 \ 2753 develop(bool, VerifyActivationFrameSize, false, \ 2754 "Verify that activation frame didn't become smaller than its " \ 2755 "minimal size") \ 2756 \ 2757 develop(bool, TraceFrequencyInlining, false, \ 2758 "Trace frequency based inlining") \ 2759 \ 2760 develop_pd(bool, InlineIntrinsics, \ 2761 "Inline intrinsics that can be statically resolved") \ 2762 \ 2763 product_pd(bool, ProfileInterpreter, \ 2764 "Profile at the bytecode level during interpretation") \ 2765 \ 2766 develop(bool, TraceProfileInterpreter, false, \ 2767 "Trace profiling at the bytecode level during interpretation. " \ 2768 "This outputs the profiling information collected to improve " \ 2769 "jit compilation.") \ 2770 \ 2771 develop_pd(bool, ProfileTraps, \ 2772 "Profile deoptimization traps at the bytecode level") \ 2773 \ 2774 product(intx, ProfileMaturityPercentage, 20, \ 2775 "number of method invocations/branches (expressed as % of " \ 2776 "CompileThreshold) before using the method's profile") \ 2777 range(0, 100) \ 2778 \ 2779 diagnostic(bool, PrintMethodData, false, \ 2780 "Print the results of +ProfileInterpreter at end of run") \ 2781 \ 2782 develop(bool, VerifyDataPointer, trueInDebug, \ 2783 "Verify the method data pointer during interpreter profiling") \ 2784 \ 2785 develop(bool, VerifyCompiledCode, false, \ 2786 "Include miscellaneous runtime verifications in nmethod code; " \ 2787 "default off because it disturbs nmethod size heuristics") \ 2788 \ 2789 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2790 "Manually make GC thread crash then dump java stack trace; " \ 2791 "Test only") \ 2792 \ 2793 /* compilation */ \ 2794 product(bool, UseCompiler, true, \ 2795 "Use Just-In-Time compilation") \ 2796 \ 2797 develop(bool, TraceCompilationPolicy, false, \ 2798 "Trace compilation policy") \ 2799 \ 2800 develop(bool, TimeCompilationPolicy, false, \ 2801 "Time the compilation policy") \ 2802 \ 2803 product(bool, UseCounterDecay, true, \ 2804 "Adjust recompilation counters") \ 2805 \ 2806 develop(intx, CounterHalfLifeTime, 30, \ 2807 "Half-life time of invocation counters (in seconds)") \ 2808 \ 2809 develop(intx, CounterDecayMinIntervalLength, 500, \ 2810 "The minimum interval (in milliseconds) between invocation of " \ 2811 "CounterDecay") \ 2812 \ 2813 product(bool, AlwaysCompileLoopMethods, false, \ 2814 "When using recompilation, never interpret methods " \ 2815 "containing loops") \ 2816 \ 2817 product(bool, DontCompileHugeMethods, true, \ 2818 "Do not compile methods > HugeMethodLimit") \ 2819 \ 2820 /* Bytecode escape analysis estimation. */ \ 2821 product(bool, EstimateArgEscape, true, \ 2822 "Analyze bytecodes to estimate escape state of arguments") \ 2823 \ 2824 product(intx, BCEATraceLevel, 0, \ 2825 "How much tracing to do of bytecode escape analysis estimates " \ 2826 "(0-3)") \ 2827 range(0, 3) \ 2828 \ 2829 product(intx, MaxBCEAEstimateLevel, 5, \ 2830 "Maximum number of nested calls that are analyzed by BC EA") \ 2831 range(0, max_jint) \ 2832 \ 2833 product(intx, MaxBCEAEstimateSize, 150, \ 2834 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2835 range(0, max_jint) \ 2836 \ 2837 product(intx, AllocatePrefetchStyle, 1, \ 2838 "0 = no prefetch, " \ 2839 "1 = generate prefetch instructions for each allocation, " \ 2840 "2 = use TLAB watermark to gate allocation prefetch, " \ 2841 "3 = generate one prefetch instruction per cache line") \ 2842 range(0, 3) \ 2843 \ 2844 product(intx, AllocatePrefetchDistance, -1, \ 2845 "Distance to prefetch ahead of allocation pointer. " \ 2846 "-1: use system-specific value (automatically determined") \ 2847 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2848 \ 2849 product(intx, AllocatePrefetchLines, 3, \ 2850 "Number of lines to prefetch ahead of array allocation pointer") \ 2851 range(1, 64) \ 2852 \ 2853 product(intx, AllocateInstancePrefetchLines, 1, \ 2854 "Number of lines to prefetch ahead of instance allocation " \ 2855 "pointer") \ 2856 range(1, 64) \ 2857 \ 2858 product(intx, AllocatePrefetchStepSize, 16, \ 2859 "Step size in bytes of sequential prefetch instructions") \ 2860 range(1, 512) \ 2861 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2862 \ 2863 product(intx, AllocatePrefetchInstr, 0, \ 2864 "Select instruction to prefetch ahead of allocation pointer") \ 2865 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2866 \ 2867 /* deoptimization */ \ 2868 develop(bool, TraceDeoptimization, false, \ 2869 "Trace deoptimization") \ 2870 \ 2871 develop(bool, PrintDeoptimizationDetails, false, \ 2872 "Print more information about deoptimization") \ 2873 \ 2874 develop(bool, DebugDeoptimization, false, \ 2875 "Tracing various information while debugging deoptimization") \ 2876 \ 2877 product(intx, SelfDestructTimer, 0, \ 2878 "Will cause VM to terminate after a given time (in minutes) " \ 2879 "(0 means off)") \ 2880 range(0, max_intx) \ 2881 \ 2882 product(intx, MaxJavaStackTraceDepth, 1024, \ 2883 "The maximum number of lines in the stack trace for Java " \ 2884 "exceptions (0 means all)") \ 2885 range(0, max_jint/2) \ 2886 \ 2887 /* notice: the max range value here is max_jint, not max_intx */ \ 2888 /* because of overflow issue */ \ 2889 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2890 "Guarantee a safepoint (at least) every so many milliseconds " \ 2891 "(0 means none)") \ 2892 range(0, max_jint) \ 2893 \ 2894 product(intx, SafepointTimeoutDelay, 10000, \ 2895 "Delay in milliseconds for option SafepointTimeout") \ 2896 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2897 NOT_LP64(range(0, max_intx)) \ 2898 \ 2899 product(intx, NmethodSweepActivity, 10, \ 2900 "Removes cold nmethods from code cache if > 0. Higher values " \ 2901 "result in more aggressive sweeping") \ 2902 range(0, 2000) \ 2903 \ 2904 notproduct(bool, LogSweeper, false, \ 2905 "Keep a ring buffer of sweeper activity") \ 2906 \ 2907 notproduct(intx, SweeperLogEntries, 1024, \ 2908 "Number of records in the ring buffer of sweeper activity") \ 2909 \ 2910 notproduct(intx, MemProfilingInterval, 500, \ 2911 "Time between each invocation of the MemProfiler") \ 2912 \ 2913 develop(intx, MallocCatchPtr, -1, \ 2914 "Hit breakpoint when mallocing/freeing this pointer") \ 2915 \ 2916 notproduct(ccstrlist, SuppressErrorAt, "", \ 2917 "List of assertions (file:line) to muzzle") \ 2918 \ 2919 develop(intx, StackPrintLimit, 100, \ 2920 "number of stack frames to print in VM-level stack dump") \ 2921 \ 2922 notproduct(intx, MaxElementPrintSize, 256, \ 2923 "maximum number of elements to print") \ 2924 \ 2925 notproduct(intx, MaxSubklassPrintSize, 4, \ 2926 "maximum number of subklasses to print when printing klass") \ 2927 \ 2928 product(intx, MaxInlineLevel, 9, \ 2929 "maximum number of nested calls that are inlined") \ 2930 range(0, max_jint) \ 2931 \ 2932 product(intx, MaxRecursiveInlineLevel, 1, \ 2933 "maximum number of nested recursive calls that are inlined") \ 2934 range(0, max_jint) \ 2935 \ 2936 develop(intx, MaxForceInlineLevel, 100, \ 2937 "maximum number of nested calls that are forced for inlining " \ 2938 "(using CompileCommand or marked w/ @ForceInline)") \ 2939 range(0, max_jint) \ 2940 \ 2941 product_pd(intx, InlineSmallCode, \ 2942 "Only inline already compiled methods if their code size is " \ 2943 "less than this") \ 2944 range(0, max_jint) \ 2945 \ 2946 product(intx, MaxInlineSize, 35, \ 2947 "The maximum bytecode size of a method to be inlined") \ 2948 range(0, max_jint) \ 2949 \ 2950 product_pd(intx, FreqInlineSize, \ 2951 "The maximum bytecode size of a frequent method to be inlined") \ 2952 range(0, max_jint) \ 2953 \ 2954 product(intx, MaxTrivialSize, 6, \ 2955 "The maximum bytecode size of a trivial method to be inlined") \ 2956 range(0, max_jint) \ 2957 \ 2958 product(intx, MinInliningThreshold, 250, \ 2959 "The minimum invocation count a method needs to have to be " \ 2960 "inlined") \ 2961 range(0, max_jint) \ 2962 \ 2963 develop(intx, MethodHistogramCutoff, 100, \ 2964 "The cutoff value for method invocation histogram (+CountCalls)") \ 2965 \ 2966 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2967 "Number of interpreted methods to show in profile") \ 2968 \ 2969 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2970 "Number of compiled methods to show in profile") \ 2971 \ 2972 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2973 "Number of stub methods to show in profile") \ 2974 \ 2975 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2976 "Number of runtime stub nodes to show in profile") \ 2977 \ 2978 product(intx, ProfileIntervalsTicks, 100, \ 2979 "Number of ticks between printing of interval profile " \ 2980 "(+ProfileIntervals)") \ 2981 range(0, max_intx) \ 2982 \ 2983 notproduct(intx, ScavengeALotInterval, 1, \ 2984 "Interval between which scavenge will occur with +ScavengeALot") \ 2985 \ 2986 notproduct(intx, FullGCALotInterval, 1, \ 2987 "Interval between which full gc will occur with +FullGCALot") \ 2988 \ 2989 notproduct(intx, FullGCALotStart, 0, \ 2990 "For which invocation to start FullGCAlot") \ 2991 \ 2992 notproduct(intx, FullGCALotDummies, 32*K, \ 2993 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2994 "to move") \ 2995 \ 2996 develop(intx, DontYieldALotInterval, 10, \ 2997 "Interval between which yields will be dropped (milliseconds)") \ 2998 \ 2999 develop(intx, MinSleepInterval, 1, \ 3000 "Minimum sleep() interval (milliseconds) when " \ 3001 "ConvertSleepToYield is off (used for Solaris)") \ 3002 \ 3003 develop(intx, ProfilerPCTickThreshold, 15, \ 3004 "Number of ticks in a PC buckets to be a hotspot") \ 3005 \ 3006 notproduct(intx, DeoptimizeALotInterval, 5, \ 3007 "Number of exits until DeoptimizeALot kicks in") \ 3008 \ 3009 notproduct(intx, ZombieALotInterval, 5, \ 3010 "Number of exits until ZombieALot kicks in") \ 3011 \ 3012 diagnostic(uintx, MallocMaxTestWords, 0, \ 3013 "If non-zero, maximum number of words that malloc/realloc can " \ 3014 "allocate (for testing only)") \ 3015 range(0, max_uintx) \ 3016 \ 3017 product(intx, TypeProfileWidth, 2, \ 3018 "Number of receiver types to record in call/cast profile") \ 3019 range(0, 8) \ 3020 \ 3021 develop(intx, BciProfileWidth, 2, \ 3022 "Number of return bci's to record in ret profile") \ 3023 \ 3024 product(intx, PerMethodRecompilationCutoff, 400, \ 3025 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3026 range(-1, max_intx) \ 3027 \ 3028 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3029 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3030 range(-1, max_intx) \ 3031 \ 3032 product(intx, PerMethodTrapLimit, 100, \ 3033 "Limit on traps (of one kind) in a method (includes inlines)") \ 3034 range(0, max_jint) \ 3035 \ 3036 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3037 "Limit on speculative traps (of one kind) in a method " \ 3038 "(includes inlines)") \ 3039 range(0, max_jint) \ 3040 \ 3041 product(intx, PerBytecodeTrapLimit, 4, \ 3042 "Limit on traps (of one kind) at a particular BCI") \ 3043 range(0, max_jint) \ 3044 \ 3045 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3046 "Extra method data trap entries for speculation") \ 3047 \ 3048 develop(intx, InlineFrequencyRatio, 20, \ 3049 "Ratio of call site execution to caller method invocation") \ 3050 range(0, max_jint) \ 3051 \ 3052 diagnostic_pd(intx, InlineFrequencyCount, \ 3053 "Count of call site execution necessary to trigger frequent " \ 3054 "inlining") \ 3055 range(0, max_jint) \ 3056 \ 3057 develop(intx, InlineThrowCount, 50, \ 3058 "Force inlining of interpreted methods that throw this often") \ 3059 range(0, max_jint) \ 3060 \ 3061 develop(intx, InlineThrowMaxSize, 200, \ 3062 "Force inlining of throwing methods smaller than this") \ 3063 range(0, max_jint) \ 3064 \ 3065 develop(intx, ProfilerNodeSize, 1024, \ 3066 "Size in K to allocate for the Profile Nodes of each thread") \ 3067 range(0, 1024) \ 3068 \ 3069 /* gc parameters */ \ 3070 product(size_t, InitialHeapSize, 0, \ 3071 "Initial heap size (in bytes); zero means use ergonomics") \ 3072 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3073 \ 3074 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3075 "Maximum heap size (in bytes)") \ 3076 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3077 \ 3078 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3079 "Initial tenured generation size (in bytes)") \ 3080 range(0, max_uintx) \ 3081 \ 3082 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3083 "Initial new generation size (in bytes)") \ 3084 constraint(NewSizeConstraintFunc,AfterErgo) \ 3085 \ 3086 product(size_t, MaxNewSize, max_uintx, \ 3087 "Maximum new generation size (in bytes), max_uintx means set " \ 3088 "ergonomically") \ 3089 range(0, max_uintx) \ 3090 \ 3091 product_pd(size_t, HeapBaseMinAddress, \ 3092 "OS specific low limit for heap base address") \ 3093 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3094 \ 3095 product(size_t, PretenureSizeThreshold, 0, \ 3096 "Maximum size in bytes of objects allocated in DefNew " \ 3097 "generation; zero means no maximum") \ 3098 range(0, max_uintx) \ 3099 \ 3100 product(size_t, MinTLABSize, 2*K, \ 3101 "Minimum allowed TLAB size (in bytes)") \ 3102 range(1, max_uintx/2) \ 3103 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3104 \ 3105 product(size_t, TLABSize, 0, \ 3106 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3107 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3108 \ 3109 product(size_t, YoungPLABSize, 4096, \ 3110 "Size of young gen promotion LAB's (in HeapWords)") \ 3111 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3112 \ 3113 product(size_t, OldPLABSize, 1024, \ 3114 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3115 "of blocks to attempt to claim when refilling CMS LAB's") \ 3116 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3117 \ 3118 product(uintx, TLABAllocationWeight, 35, \ 3119 "Allocation averaging weight") \ 3120 range(0, 100) \ 3121 \ 3122 /* Limit the lower bound of this flag to 1 as it is used */ \ 3123 /* in a division expression. */ \ 3124 product(uintx, TLABWasteTargetPercent, 1, \ 3125 "Percentage of Eden that can be wasted") \ 3126 range(1, 100) \ 3127 \ 3128 product(uintx, TLABRefillWasteFraction, 64, \ 3129 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3130 range(1, max_juint) \ 3131 \ 3132 product(uintx, TLABWasteIncrement, 4, \ 3133 "Increment allowed waste at slow allocation") \ 3134 range(0, max_jint) \ 3135 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3136 \ 3137 product(uintx, SurvivorRatio, 8, \ 3138 "Ratio of eden/survivor space size") \ 3139 range(1, max_uintx-2) \ 3140 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3141 \ 3142 product(uintx, NewRatio, 2, \ 3143 "Ratio of old/new generation sizes") \ 3144 range(0, max_uintx-1) \ 3145 \ 3146 product_pd(size_t, NewSizeThreadIncrease, \ 3147 "Additional size added to desired new generation size per " \ 3148 "non-daemon thread (in bytes)") \ 3149 range(0, max_uintx) \ 3150 \ 3151 product_pd(size_t, MetaspaceSize, \ 3152 "Initial threshold (in bytes) at which a garbage collection " \ 3153 "is done to reduce Metaspace usage") \ 3154 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3155 \ 3156 product(size_t, MaxMetaspaceSize, max_uintx, \ 3157 "Maximum size of Metaspaces (in bytes)") \ 3158 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3159 \ 3160 product(size_t, CompressedClassSpaceSize, 1*G, \ 3161 "Maximum size of class area in Metaspace when compressed " \ 3162 "class pointers are used") \ 3163 range(1*M, 3*G) \ 3164 \ 3165 manageable(uintx, MinHeapFreeRatio, 40, \ 3166 "The minimum percentage of heap free after GC to avoid expansion."\ 3167 " For most GCs this applies to the old generation. In G1 and" \ 3168 " ParallelGC it applies to the whole heap.") \ 3169 range(0, 100) \ 3170 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3171 \ 3172 manageable(uintx, MaxHeapFreeRatio, 70, \ 3173 "The maximum percentage of heap free after GC to avoid shrinking."\ 3174 " For most GCs this applies to the old generation. In G1 and" \ 3175 " ParallelGC it applies to the whole heap.") \ 3176 range(0, 100) \ 3177 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3178 \ 3179 product(bool, ShrinkHeapInSteps, true, \ 3180 "When disabled, informs the GC to shrink the java heap directly" \ 3181 " to the target size at the next full GC rather than requiring" \ 3182 " smaller steps during multiple full GCs.") \ 3183 \ 3184 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3185 "Number of milliseconds per MB of free space in the heap") \ 3186 range(0, max_intx) \ 3187 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3188 \ 3189 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3190 "The minimum change in heap space due to GC (in bytes)") \ 3191 range(0, max_uintx) \ 3192 \ 3193 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3194 "The minimum expansion of Metaspace (in bytes)") \ 3195 range(0, max_uintx) \ 3196 \ 3197 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3198 "The maximum percentage of Metaspace free after GC to avoid " \ 3199 "shrinking") \ 3200 range(0, 100) \ 3201 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3202 \ 3203 product(uintx, MinMetaspaceFreeRatio, 40, \ 3204 "The minimum percentage of Metaspace free after GC to avoid " \ 3205 "expansion") \ 3206 range(0, 99) \ 3207 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3208 \ 3209 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3210 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3211 range(0, max_uintx) \ 3212 \ 3213 product(uintx, QueuedAllocationWarningCount, 0, \ 3214 "Number of times an allocation that queues behind a GC " \ 3215 "will retry before printing a warning") \ 3216 range(0, max_uintx) \ 3217 \ 3218 diagnostic(uintx, VerifyGCStartAt, 0, \ 3219 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3220 range(0, max_uintx) \ 3221 \ 3222 diagnostic(intx, VerifyGCLevel, 0, \ 3223 "Generation level at which to start +VerifyBefore/AfterGC") \ 3224 range(0, 1) \ 3225 \ 3226 product(uintx, MaxTenuringThreshold, 15, \ 3227 "Maximum value for tenuring threshold") \ 3228 range(0, markOopDesc::max_age + 1) \ 3229 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3230 \ 3231 product(uintx, InitialTenuringThreshold, 7, \ 3232 "Initial value for tenuring threshold") \ 3233 range(0, markOopDesc::max_age + 1) \ 3234 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3235 \ 3236 product(uintx, TargetSurvivorRatio, 50, \ 3237 "Desired percentage of survivor space used after scavenge") \ 3238 range(0, 100) \ 3239 \ 3240 product(uintx, MarkSweepDeadRatio, 5, \ 3241 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3242 "Serial mark sweep treats this as both the minimum and maximum " \ 3243 "value. " \ 3244 "CMS uses this value only if it falls back to mark sweep. " \ 3245 "Par compact uses a variable scale based on the density of the " \ 3246 "generation and treats this as the maximum value when the heap " \ 3247 "is either completely full or completely empty. Par compact " \ 3248 "also has a smaller default value; see arguments.cpp.") \ 3249 range(0, 100) \ 3250 \ 3251 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3252 "How often should we fully compact the heap (ignoring the dead " \ 3253 "space parameters)") \ 3254 range(1, max_juint) \ 3255 \ 3256 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3257 "Delay between expansion and allocation (in milliseconds)") \ 3258 \ 3259 develop(uintx, GCWorkerDelayMillis, 0, \ 3260 "Delay in scheduling GC workers (in milliseconds)") \ 3261 \ 3262 product(intx, DeferThrSuspendLoopCount, 4000, \ 3263 "(Unstable) Number of times to iterate in safepoint loop " \ 3264 "before blocking VM threads ") \ 3265 range(-1, max_jint-1) \ 3266 \ 3267 product(intx, DeferPollingPageLoopCount, -1, \ 3268 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3269 "before changing safepoint polling page to RO ") \ 3270 range(-1, max_jint-1) \ 3271 \ 3272 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3273 range(0, max_intx) \ 3274 \ 3275 product(bool, PSChunkLargeArrays, true, \ 3276 "Process large arrays in chunks") \ 3277 \ 3278 product(uintx, GCDrainStackTargetSize, 64, \ 3279 "Number of entries we will try to leave on the stack " \ 3280 "during parallel gc") \ 3281 range(0, max_juint) \ 3282 \ 3283 /* stack parameters */ \ 3284 product_pd(intx, StackYellowPages, \ 3285 "Number of yellow zone (recoverable overflows) pages of size " \ 3286 "4KB. If pages are bigger yellow zone is aligned up.") \ 3287 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3288 \ 3289 product_pd(intx, StackRedPages, \ 3290 "Number of red zone (unrecoverable overflows) pages of size " \ 3291 "4KB. If pages are bigger red zone is aligned up.") \ 3292 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3293 \ 3294 product_pd(intx, StackReservedPages, \ 3295 "Number of reserved zone (reserved to annotated methods) pages" \ 3296 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3297 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3298 \ 3299 product(bool, RestrictReservedStack, true, \ 3300 "Restrict @ReservedStackAccess to trusted classes") \ 3301 \ 3302 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3303 product_pd(intx, StackShadowPages, \ 3304 "Number of shadow zone (for overflow checking) pages of size " \ 3305 "4KB. If pages are bigger shadow zone is aligned up. " \ 3306 "This should exceed the depth of the VM and native call stack.") \ 3307 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3308 \ 3309 product_pd(intx, ThreadStackSize, \ 3310 "Thread Stack Size (in Kbytes)") \ 3311 range(0, (max_intx-os::vm_page_size())/(1 * K)) \ 3312 \ 3313 product_pd(intx, VMThreadStackSize, \ 3314 "Non-Java Thread Stack Size (in Kbytes)") \ 3315 range(0, max_intx/(1 * K)) \ 3316 \ 3317 product_pd(intx, CompilerThreadStackSize, \ 3318 "Compiler Thread Stack Size (in Kbytes)") \ 3319 range(0, max_intx/(1 * K)) \ 3320 \ 3321 develop_pd(size_t, JVMInvokeMethodSlack, \ 3322 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3323 \ 3324 /* code cache parameters */ \ 3325 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3326 develop(uintx, CodeCacheSegmentSize, \ 3327 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)), \ 3328 "Code cache segment size (in bytes) - smallest unit of " \ 3329 "allocation") \ 3330 range(1, 1024) \ 3331 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3332 \ 3333 develop_pd(intx, CodeEntryAlignment, \ 3334 "Code entry alignment for generated code (in bytes)") \ 3335 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3336 \ 3337 product_pd(intx, OptoLoopAlignment, \ 3338 "Align inner loops to zero relative to this modulus") \ 3339 range(1, 16) \ 3340 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3341 \ 3342 product_pd(uintx, InitialCodeCacheSize, \ 3343 "Initial code cache size (in bytes)") \ 3344 range(0, max_uintx) \ 3345 \ 3346 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3347 "Minimum code cache size (in bytes) required to start VM.") \ 3348 range(0, max_uintx) \ 3349 \ 3350 product(bool, SegmentedCodeCache, false, \ 3351 "Use a segmented code cache") \ 3352 \ 3353 product_pd(uintx, ReservedCodeCacheSize, \ 3354 "Reserved code cache size (in bytes) - maximum code cache size") \ 3355 range(0, max_uintx) \ 3356 \ 3357 product_pd(uintx, NonProfiledCodeHeapSize, \ 3358 "Size of code heap with non-profiled methods (in bytes)") \ 3359 range(0, max_uintx) \ 3360 \ 3361 product_pd(uintx, ProfiledCodeHeapSize, \ 3362 "Size of code heap with profiled methods (in bytes)") \ 3363 range(0, max_uintx) \ 3364 \ 3365 product_pd(uintx, NonNMethodCodeHeapSize, \ 3366 "Size of code heap with non-nmethods (in bytes)") \ 3367 range(0, max_uintx) \ 3368 \ 3369 product_pd(uintx, CodeCacheExpansionSize, \ 3370 "Code cache expansion size (in bytes)") \ 3371 range(0, max_uintx) \ 3372 \ 3373 develop_pd(uintx, CodeCacheMinBlockLength, \ 3374 "Minimum number of segments in a code cache block") \ 3375 range(1, 100) \ 3376 \ 3377 notproduct(bool, ExitOnFullCodeCache, false, \ 3378 "Exit the VM if we fill the code cache") \ 3379 \ 3380 product(bool, UseCodeCacheFlushing, true, \ 3381 "Remove cold/old nmethods from the code cache") \ 3382 \ 3383 product(uintx, StartAggressiveSweepingAt, 10, \ 3384 "Start aggressive sweeping if X[%] of the code cache is free." \ 3385 "Segmented code cache: X[%] of the non-profiled heap." \ 3386 "Non-segmented code cache: X[%] of the total code cache") \ 3387 range(0, 100) \ 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, Tier4InvocationThreshold, 5000, \ 3662 "Compile if number of method invocations crosses this " \ 3663 "threshold") \ 3664 range(0, max_jint) \ 3665 \ 3666 product(intx, Tier4MinInvocationThreshold, 600, \ 3667 "Minimum invocation to compile at tier 4") \ 3668 range(0, max_jint) \ 3669 \ 3670 product(intx, Tier4CompileThreshold, 15000, \ 3671 "Threshold at which tier 4 compilation is invoked (invocation " \ 3672 "minimum must be satisfied") \ 3673 range(0, max_jint) \ 3674 \ 3675 product(intx, Tier4BackEdgeThreshold, 40000, \ 3676 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3677 range(0, max_jint) \ 3678 \ 3679 product(intx, Tier3DelayOn, 5, \ 3680 "If C2 queue size grows over this amount per compiler thread " \ 3681 "stop compiling at tier 3 and start compiling at tier 2") \ 3682 range(0, max_jint) \ 3683 \ 3684 product(intx, Tier3DelayOff, 2, \ 3685 "If C2 queue size is less than this amount per compiler thread " \ 3686 "allow methods compiled at tier 2 transition to tier 3") \ 3687 range(0, max_jint) \ 3688 \ 3689 product(intx, Tier3LoadFeedback, 5, \ 3690 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3691 "reaches this amount per compiler thread") \ 3692 range(0, max_jint) \ 3693 \ 3694 product(intx, Tier4LoadFeedback, 3, \ 3695 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3696 "reaches this amount per compiler thread") \ 3697 range(0, max_jint) \ 3698 \ 3699 product(intx, TieredCompileTaskTimeout, 50, \ 3700 "Kill compile task if method was not used within " \ 3701 "given timeout in milliseconds") \ 3702 range(0, max_intx) \ 3703 \ 3704 product(intx, TieredStopAtLevel, 4, \ 3705 "Stop at given compilation level") \ 3706 range(0, 4) \ 3707 \ 3708 product(intx, Tier0ProfilingStartPercentage, 200, \ 3709 "Start profiling in interpreter if the counters exceed tier 3 " \ 3710 "thresholds by the specified percentage") \ 3711 range(0, max_jint) \ 3712 \ 3713 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3714 "Increase the compile threshold for C1 compilation if the code " \ 3715 "cache is filled by the specified percentage") \ 3716 range(0, 99) \ 3717 \ 3718 product(intx, TieredRateUpdateMinTime, 1, \ 3719 "Minimum rate sampling interval (in milliseconds)") \ 3720 range(0, max_intx) \ 3721 \ 3722 product(intx, TieredRateUpdateMaxTime, 25, \ 3723 "Maximum rate sampling interval (in milliseconds)") \ 3724 range(0, max_intx) \ 3725 \ 3726 product_pd(bool, TieredCompilation, \ 3727 "Enable tiered compilation") \ 3728 \ 3729 product(bool, PrintTieredEvents, false, \ 3730 "Print tiered events notifications") \ 3731 \ 3732 product_pd(intx, OnStackReplacePercentage, \ 3733 "NON_TIERED number of method invocations/branches (expressed as " \ 3734 "% of CompileThreshold) before (re-)compiling OSR code") \ 3735 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3736 \ 3737 product(intx, InterpreterProfilePercentage, 33, \ 3738 "NON_TIERED number of method invocations/branches (expressed as " \ 3739 "% of CompileThreshold) before profiling in the interpreter") \ 3740 range(0, 100) \ 3741 \ 3742 develop(intx, MaxRecompilationSearchLength, 10, \ 3743 "The maximum number of frames to inspect when searching for " \ 3744 "recompilee") \ 3745 \ 3746 develop(intx, MaxInterpretedSearchLength, 3, \ 3747 "The maximum number of interpreted frames to skip when searching "\ 3748 "for recompilee") \ 3749 \ 3750 develop(intx, DesiredMethodLimit, 8000, \ 3751 "The desired maximum method size (in bytecodes) after inlining") \ 3752 \ 3753 develop(intx, HugeMethodLimit, 8000, \ 3754 "Don't compile methods larger than this if " \ 3755 "+DontCompileHugeMethods") \ 3756 \ 3757 /* New JDK 1.4 reflection implementation */ \ 3758 \ 3759 develop(intx, FastSuperclassLimit, 8, \ 3760 "Depth of hardwired instanceof accelerator array") \ 3761 \ 3762 /* Properties for Java libraries */ \ 3763 \ 3764 product(uint64_t, MaxDirectMemorySize, 0, \ 3765 "Maximum total size of NIO direct-buffer allocations") \ 3766 range(0, max_jlong) \ 3767 \ 3768 /* Flags used for temporary code during development */ \ 3769 \ 3770 diagnostic(bool, UseNewCode, false, \ 3771 "Testing Only: Use the new version while testing") \ 3772 \ 3773 diagnostic(bool, UseNewCode2, false, \ 3774 "Testing Only: Use the new version while testing") \ 3775 \ 3776 diagnostic(bool, UseNewCode3, false, \ 3777 "Testing Only: Use the new version while testing") \ 3778 \ 3779 /* flags for performance data collection */ \ 3780 \ 3781 product(bool, UsePerfData, true, \ 3782 "Flag to disable jvmstat instrumentation for performance testing "\ 3783 "and problem isolation purposes") \ 3784 \ 3785 product(bool, PerfDataSaveToFile, false, \ 3786 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3787 \ 3788 product(ccstr, PerfDataSaveFile, NULL, \ 3789 "Save PerfData memory to the specified absolute pathname. " \ 3790 "The string %p in the file name (if present) " \ 3791 "will be replaced by pid") \ 3792 \ 3793 product(intx, PerfDataSamplingInterval, 50, \ 3794 "Data sampling interval (in milliseconds)") \ 3795 range(PeriodicTask::min_interval, max_jint) \ 3796 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3797 \ 3798 develop(bool, PerfTraceDataCreation, false, \ 3799 "Trace creation of Performance Data Entries") \ 3800 \ 3801 develop(bool, PerfTraceMemOps, false, \ 3802 "Trace PerfMemory create/attach/detach calls") \ 3803 \ 3804 product(bool, PerfDisableSharedMem, false, \ 3805 "Store performance data in standard memory") \ 3806 \ 3807 product(intx, PerfDataMemorySize, 32*K, \ 3808 "Size of performance data memory region. Will be rounded " \ 3809 "up to a multiple of the native os page size.") \ 3810 range(128, 32*64*K) \ 3811 \ 3812 product(intx, PerfMaxStringConstLength, 1024, \ 3813 "Maximum PerfStringConstant string length before truncation") \ 3814 range(32, 32*K) \ 3815 \ 3816 product(bool, PerfAllowAtExitRegistration, false, \ 3817 "Allow registration of atexit() methods") \ 3818 \ 3819 product(bool, PerfBypassFileSystemCheck, false, \ 3820 "Bypass Win32 file system criteria checks (Windows Only)") \ 3821 \ 3822 product(intx, UnguardOnExecutionViolation, 0, \ 3823 "Unguard page and retry on no-execute fault (Win32 only) " \ 3824 "0=off, 1=conservative, 2=aggressive") \ 3825 range(0, 2) \ 3826 \ 3827 /* Serviceability Support */ \ 3828 \ 3829 product(bool, ManagementServer, false, \ 3830 "Create JMX Management Server") \ 3831 \ 3832 product(bool, DisableAttachMechanism, false, \ 3833 "Disable mechanism that allows tools to attach to this VM") \ 3834 \ 3835 product(bool, StartAttachListener, false, \ 3836 "Always start Attach Listener at VM startup") \ 3837 \ 3838 manageable(bool, PrintConcurrentLocks, false, \ 3839 "Print java.util.concurrent locks in thread dump") \ 3840 \ 3841 product(bool, TransmitErrorReport, false, \ 3842 "Enable error report transmission on erroneous termination") \ 3843 \ 3844 product(ccstr, ErrorReportServer, NULL, \ 3845 "Override built-in error report server address") \ 3846 \ 3847 /* Shared spaces */ \ 3848 \ 3849 product(bool, UseSharedSpaces, true, \ 3850 "Use shared spaces for metadata") \ 3851 \ 3852 product(bool, VerifySharedSpaces, false, \ 3853 "Verify shared spaces (false for default archive, true for " \ 3854 "archive specified by -XX:SharedArchiveFile)") \ 3855 \ 3856 product(bool, RequireSharedSpaces, false, \ 3857 "Require shared spaces for metadata") \ 3858 \ 3859 product(bool, DumpSharedSpaces, false, \ 3860 "Special mode: JVM reads a class list, loads classes, builds " \ 3861 "shared spaces, and dumps the shared spaces to a file to be " \ 3862 "used in future JVM runs") \ 3863 \ 3864 product(bool, PrintSharedSpaces, false, \ 3865 "Print usage of shared spaces") \ 3866 \ 3867 product(bool, PrintSharedArchiveAndExit, false, \ 3868 "Print shared archive file contents") \ 3869 \ 3870 product(bool, PrintSharedDictionary, false, \ 3871 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3872 "dictionary") \ 3873 \ 3874 product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE, \ 3875 "Size of read-write space for metadata (in bytes)") \ 3876 range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE) \ 3877 constraint(SharedReadWriteSizeConstraintFunc,AfterErgo) \ 3878 \ 3879 product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE, \ 3880 "Size of read-only space for metadata (in bytes)") \ 3881 range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE) \ 3882 constraint(SharedReadOnlySizeConstraintFunc,AfterErgo) \ 3883 \ 3884 product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE, \ 3885 "Size of the shared miscellaneous data area (in bytes)") \ 3886 range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE) \ 3887 constraint(SharedMiscDataSizeConstraintFunc,AfterErgo) \ 3888 \ 3889 product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE, \ 3890 "Size of the shared miscellaneous code area (in bytes)") \ 3891 range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE) \ 3892 constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo) \ 3893 \ 3894 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3895 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3896 "Address to allocate shared memory region for class data") \ 3897 range(0, SIZE_MAX) \ 3898 \ 3899 product(uintx, SharedSymbolTableBucketSize, 4, \ 3900 "Average number of symbols per bucket in shared table") \ 3901 range(2, 246) \ 3902 \ 3903 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3904 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3905 "classes. Just exclude them from the shared dictionary.") \ 3906 \ 3907 diagnostic(bool, PrintMethodHandleStubs, false, \ 3908 "Print generated stub code for method handles") \ 3909 \ 3910 develop(bool, TraceMethodHandles, false, \ 3911 "trace internal method handle operations") \ 3912 \ 3913 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3914 "perform extra checks when constructing method handles") \ 3915 \ 3916 diagnostic(bool, ShowHiddenFrames, false, \ 3917 "show method handle implementation frames (usually hidden)") \ 3918 \ 3919 experimental(bool, TrustFinalNonStaticFields, false, \ 3920 "trust final non-static declarations for constant folding") \ 3921 \ 3922 diagnostic(bool, FoldStableValues, true, \ 3923 "Optimize loads from stable fields (marked w/ @Stable)") \ 3924 \ 3925 develop(bool, TraceInvokeDynamic, false, \ 3926 "trace internal invoke dynamic operations") \ 3927 \ 3928 diagnostic(bool, PauseAtStartup, false, \ 3929 "Causes the VM to pause at startup time and wait for the pause " \ 3930 "file to be removed (default: ./vm.paused.<pid>)") \ 3931 \ 3932 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3933 "The file to create and for whose removal to await when pausing " \ 3934 "at startup. (default: ./vm.paused.<pid>)") \ 3935 \ 3936 diagnostic(bool, PauseAtExit, false, \ 3937 "Pause and wait for keypress on exit if a debugger is attached") \ 3938 \ 3939 product(bool, ExtendedDTraceProbes, false, \ 3940 "Enable performance-impacting dtrace probes") \ 3941 \ 3942 product(bool, DTraceMethodProbes, false, \ 3943 "Enable dtrace probes for method-entry and method-exit") \ 3944 \ 3945 product(bool, DTraceAllocProbes, false, \ 3946 "Enable dtrace probes for object allocation") \ 3947 \ 3948 product(bool, DTraceMonitorProbes, false, \ 3949 "Enable dtrace probes for monitor events") \ 3950 \ 3951 product(bool, RelaxAccessControlCheck, false, \ 3952 "Relax the access control checks in the verifier") \ 3953 \ 3954 product(uintx, StringTableSize, defaultStringTableSize, \ 3955 "Number of buckets in the interned String table") \ 3956 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3957 \ 3958 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3959 "Number of buckets in the JVM internal Symbol table") \ 3960 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3961 \ 3962 product(bool, UseStringDeduplication, false, \ 3963 "Use string deduplication") \ 3964 \ 3965 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3966 "A string must reach this age (or be promoted to an old region) " \ 3967 "to be considered for deduplication") \ 3968 range(1, markOopDesc::max_age) \ 3969 \ 3970 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3971 "Force table resize every time the table is scanned") \ 3972 \ 3973 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3974 "Force table rehash every time the table is scanned") \ 3975 \ 3976 diagnostic(bool, WhiteBoxAPI, false, \ 3977 "Enable internal testing APIs") \ 3978 \ 3979 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3980 "Default survivor space alignment in bytes") \ 3981 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 3982 \ 3983 product(bool , AllowNonVirtualCalls, false, \ 3984 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3985 \ 3986 product(ccstr, DumpLoadedClassList, NULL, \ 3987 "Dump the names all loaded classes, that could be stored into " \ 3988 "the CDS archive, in the specified file") \ 3989 \ 3990 product(ccstr, SharedClassListFile, NULL, \ 3991 "Override the default CDS class list") \ 3992 \ 3993 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3994 "Override the default location of the CDS archive file") \ 3995 \ 3996 product(ccstr, ExtraSharedClassListFile, NULL, \ 3997 "Extra classlist for building the CDS archive file") \ 3998 \ 3999 experimental(size_t, ArrayAllocatorMallocLimit, \ 4000 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4001 "Allocation less than this value will be allocated " \ 4002 "using malloc. Larger allocations will use mmap.") \ 4003 \ 4004 experimental(bool, AlwaysAtomicAccesses, false, \ 4005 "Accesses to all variables should always be atomic") \ 4006 \ 4007 product(bool, EnableTracing, false, \ 4008 "Enable event-based tracing") \ 4009 \ 4010 product(bool, UseLockedTracing, false, \ 4011 "Use locked-tracing when doing event-based tracing") \ 4012 \ 4013 diagnostic(bool, UseUnalignedAccesses, false, \ 4014 "Use unaligned memory accesses in Unsafe") \ 4015 \ 4016 product_pd(bool, PreserveFramePointer, \ 4017 "Use the FP register for holding the frame pointer " \ 4018 "and not as a general purpose register.") \ 4019 \ 4020 diagnostic(bool, CheckIntrinsics, true, \ 4021 "When a class C is loaded, check that " \ 4022 "(1) all intrinsics defined by the VM for class C are present "\ 4023 "in the loaded class file and are marked with the " \ 4024 "@HotSpotIntrinsicCandidate annotation, that " \ 4025 "(2) there is an intrinsic registered for all loaded methods " \ 4026 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4027 "annotation, and that " \ 4028 "(3) no orphan methods exist for class C (i.e., methods for " \ 4029 "which the VM declares an intrinsic but that are not declared "\ 4030 "in the loaded class C. " \ 4031 "Check (3) is available only in debug builds.") \ 4032 \ 4033 diagnostic_pd(intx, InitArrayShortSize, \ 4034 "Threshold small size (in bytes) for clearing arrays. " \ 4035 "Anything this size or smaller may get converted to discrete " \ 4036 "scalar stores.") \ 4037 range(0, max_intx) \ 4038 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4039 \ 4040 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4041 "Disable backwards compatibility for compile commands.") \ 4042 \ 4043 diagnostic(bool, CompilerDirectivesPrint, false, \ 4044 "Print compiler directives on installation.") \ 4045 diagnostic(int, CompilerDirectivesLimit, 50, \ 4046 "Limit on number of compiler directives.") 4047 4048 4049/* 4050 * Macros for factoring of globals 4051 */ 4052 4053// Interface macros 4054#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4055#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4056#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4057#define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4058#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4059#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4060#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4061#ifdef PRODUCT 4062#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4063#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4064#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4065#else 4066#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4067#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4068#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4069#endif // PRODUCT 4070// Special LP64 flags, product only needed for now. 4071#ifdef _LP64 4072#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4073#else 4074#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4075#endif // _LP64 4076 4077// Implementation macros 4078#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4079#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4080#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4081#define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4082#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4083#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4084#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4085#ifdef PRODUCT 4086#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4087#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4088#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4089#else 4090#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4091#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4092#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4093#endif // PRODUCT 4094#ifdef _LP64 4095#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4096#else 4097#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4098#endif // _LP64 4099 4100// Only materialize src code for range checking when required, ignore otherwise 4101#define IGNORE_RANGE(a, b) 4102// Only materialize src code for contraint checking when required, ignore otherwise 4103#define IGNORE_CONSTRAINT(func,type) 4104 4105#define IGNORE_WRITEABLE(type) 4106 4107RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4108 DECLARE_PD_DEVELOPER_FLAG, \ 4109 DECLARE_PRODUCT_FLAG, \ 4110 DECLARE_PD_PRODUCT_FLAG, \ 4111 DECLARE_DIAGNOSTIC_FLAG, \ 4112 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4113 DECLARE_EXPERIMENTAL_FLAG, \ 4114 DECLARE_NOTPRODUCT_FLAG, \ 4115 DECLARE_MANAGEABLE_FLAG, \ 4116 DECLARE_PRODUCT_RW_FLAG, \ 4117 DECLARE_LP64_PRODUCT_FLAG, \ 4118 IGNORE_RANGE, \ 4119 IGNORE_CONSTRAINT, \ 4120 IGNORE_WRITEABLE) 4121 4122RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4123 DECLARE_PD_DEVELOPER_FLAG, \ 4124 DECLARE_PRODUCT_FLAG, \ 4125 DECLARE_PD_PRODUCT_FLAG, \ 4126 DECLARE_DIAGNOSTIC_FLAG, \ 4127 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4128 DECLARE_NOTPRODUCT_FLAG, \ 4129 IGNORE_RANGE, \ 4130 IGNORE_CONSTRAINT, \ 4131 IGNORE_WRITEABLE) 4132 4133ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4134 DECLARE_PRODUCT_FLAG, \ 4135 DECLARE_DIAGNOSTIC_FLAG, \ 4136 DECLARE_EXPERIMENTAL_FLAG, \ 4137 DECLARE_NOTPRODUCT_FLAG, \ 4138 IGNORE_RANGE, \ 4139 IGNORE_CONSTRAINT, \ 4140 IGNORE_WRITEABLE) 4141 4142// Extensions 4143 4144#include "runtime/globals_ext.hpp" 4145 4146#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 4147