globals.hpp revision 2864:1bbf5b6fb7b0
12089Ssos/* 216565Ssos * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 32089Ssos * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 42089Ssos * 52089Ssos * This code is free software; you can redistribute it and/or modify it 62089Ssos * under the terms of the GNU General Public License version 2 only, as 72089Ssos * published by the Free Software Foundation. 82089Ssos * 95994Ssos * This code is distributed in the hope that it will be useful, but WITHOUT 105994Ssos * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 112089Ssos * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 122089Ssos * version 2 for more details (a copy is included in the LICENSE file that 132089Ssos * accompanied this code). 142089Ssos * 152089Ssos * You should have received a copy of the GNU General Public License version 162089Ssos * 2 along with this work; if not, write to the Free Software Foundation, 172089Ssos * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 182089Ssos * 192089Ssos * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 202089Ssos * or visit www.oracle.com if you need additional information or have any 212089Ssos * questions. 222089Ssos * 232089Ssos */ 242089Ssos 252089Ssos#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 262089Ssos#define SHARE_VM_RUNTIME_GLOBALS_HPP 272089Ssos 282089Ssos#include "utilities/debug.hpp" 2930764Scharnier#ifdef TARGET_ARCH_x86 3030764Scharnier# include "globals_x86.hpp" 3150479Speter#endif 3230764Scharnier#ifdef TARGET_ARCH_sparc 3330764Scharnier# include "globals_sparc.hpp" 342089Ssos#endif 3530764Scharnier#ifdef TARGET_ARCH_zero 3655849Syokota# include "globals_zero.hpp" 372089Ssos#endif 3823457Sbrian#ifdef TARGET_ARCH_arm 3930764Scharnier# include "globals_arm.hpp" 4023702Speter#endif 4166834Sphk#ifdef TARGET_ARCH_ppc 4266834Sphk# include "globals_ppc.hpp" 432089Ssos#endif 4475344Ssobomax#ifdef TARGET_OS_FAMILY_linux 4575344Ssobomax# include "globals_linux.hpp" 462089Ssos#endif 4723457Sbrian#ifdef TARGET_OS_FAMILY_solaris 482089Ssos# include "globals_solaris.hpp" 4971642Ssobomax#endif 5071642Ssobomax#ifdef TARGET_OS_FAMILY_windows 5171642Ssobomax# include "globals_windows.hpp" 5271642Ssobomax#endif 532089Ssos#ifdef TARGET_OS_FAMILY_bsd 542089Ssos# include "globals_bsd.hpp" 552089Ssos#endif 562089Ssos#ifdef TARGET_OS_ARCH_linux_x86 572089Ssos# include "globals_linux_x86.hpp" 586628Ssos#endif 592089Ssos#ifdef TARGET_OS_ARCH_linux_sparc 606047Ssos# include "globals_linux_sparc.hpp" 6171642Ssobomax#endif 6271642Ssobomax#ifdef TARGET_OS_ARCH_linux_zero 632089Ssos# include "globals_linux_zero.hpp" 642089Ssos#endif 652089Ssos#ifdef TARGET_OS_ARCH_solaris_x86 662089Ssos# include "globals_solaris_x86.hpp" 6730764Scharnier#endif 686628Ssos#ifdef TARGET_OS_ARCH_solaris_sparc 696628Ssos# include "globals_solaris_sparc.hpp" 7055849Syokota#endif 7130764Scharnier#ifdef TARGET_OS_ARCH_windows_x86 7255849Syokota# include "globals_windows_x86.hpp" 7371642Ssobomax#endif 7471642Ssobomax#ifdef TARGET_OS_ARCH_linux_arm 7530764Scharnier# include "globals_linux_arm.hpp" 766628Ssos#endif 776628Ssos#ifdef TARGET_OS_ARCH_linux_ppc 782089Ssos# include "globals_linux_ppc.hpp" 7975344Ssobomax#endif 802089Ssos#ifdef TARGET_OS_ARCH_bsd_x86 812089Ssos# include "globals_bsd_x86.hpp" 822089Ssos#endif 8375344Ssobomax#ifdef TARGET_OS_ARCH_bsd_zero 8475344Ssobomax# include "globals_bsd_zero.hpp" 8575344Ssobomax#endif 862089Ssos#ifdef COMPILER1 872089Ssos#ifdef TARGET_ARCH_x86 882089Ssos# include "c1_globals_x86.hpp" 892089Ssos#endif 902089Ssos#ifdef TARGET_ARCH_sparc 916628Ssos# include "c1_globals_sparc.hpp" 926628Ssos#endif 936628Ssos#ifdef TARGET_ARCH_arm 942089Ssos# include "c1_globals_arm.hpp" 952089Ssos#endif 9652262Sbillf#ifdef TARGET_ARCH_ppc 972089Ssos# include "c1_globals_ppc.hpp" 982089Ssos#endif 992089Ssos#ifdef TARGET_OS_FAMILY_linux 1002089Ssos# include "c1_globals_linux.hpp" 10152262Sbillf#endif 1022089Ssos#ifdef TARGET_OS_FAMILY_solaris 1032089Ssos# include "c1_globals_solaris.hpp" 1042089Ssos#endif 1052089Ssos#ifdef TARGET_OS_FAMILY_windows 1062089Ssos# include "c1_globals_windows.hpp" 1072089Ssos#endif 1082089Ssos#ifdef TARGET_OS_FAMILY_bsd 1092089Ssos# include "c1_globals_bsd.hpp" 1102089Ssos#endif 1112089Ssos#endif 1122089Ssos#ifdef COMPILER2 1132089Ssos#ifdef TARGET_ARCH_x86 1142089Ssos# include "c2_globals_x86.hpp" 1152089Ssos#endif 1162089Ssos#ifdef TARGET_ARCH_sparc 11723457Sbrian# include "c2_globals_sparc.hpp" 1182089Ssos#endif 1192089Ssos#ifdef TARGET_ARCH_arm 1202089Ssos# include "c2_globals_arm.hpp" 1212089Ssos#endif 1222089Ssos#ifdef TARGET_OS_FAMILY_linux 1232089Ssos# include "c2_globals_linux.hpp" 1242089Ssos#endif 1252089Ssos#ifdef TARGET_OS_FAMILY_solaris 12623457Sbrian# include "c2_globals_solaris.hpp" 12723457Sbrian#endif 1282089Ssos#ifdef TARGET_OS_FAMILY_windows 1292089Ssos# include "c2_globals_windows.hpp" 1302089Ssos#endif 13130764Scharnier#ifdef TARGET_OS_FAMILY_bsd 1322089Ssos# include "c2_globals_bsd.hpp" 1332089Ssos#endif 1342089Ssos#endif 13575344Ssobomax#ifdef SHARK 1362089Ssos#ifdef TARGET_ARCH_zero 1372089Ssos# include "shark_globals_zero.hpp" 13830764Scharnier#endif 13923457Sbrian#endif 1402089Ssos 1412089Ssos#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1422089Ssosdefine_pd_global(bool, BackgroundCompilation, false); 1432089Ssosdefine_pd_global(bool, UseTLAB, false); 14430764Scharnierdefine_pd_global(bool, CICompileOSR, false); 14523457Sbriandefine_pd_global(bool, UseTypeProfile, false); 1462089Ssosdefine_pd_global(bool, UseOnStackReplacement, false); 1472089Ssosdefine_pd_global(bool, InlineIntrinsics, false); 1482089Ssosdefine_pd_global(bool, PreferInterpreterNativeStubs, true); 1492089Ssosdefine_pd_global(bool, ProfileInterpreter, false); 1502089Ssosdefine_pd_global(bool, ProfileTraps, false); 1516628Ssosdefine_pd_global(bool, TieredCompilation, false); 1522089Ssos 1532089Ssosdefine_pd_global(intx, CompileThreshold, 0); 1542089Ssosdefine_pd_global(intx, BackEdgeThreshold, 0); 1552089Ssos 1562089Ssosdefine_pd_global(intx, OnStackReplacePercentage, 0); 15730764Scharnierdefine_pd_global(bool, ResizeTLAB, false); 1582089Ssosdefine_pd_global(intx, FreqInlineSize, 0); 1592089Ssosdefine_pd_global(intx, InlineSmallCode, 0); 1602089Ssosdefine_pd_global(intx, NewSizeThreadIncrease, 4*K); 1612089Ssosdefine_pd_global(intx, InlineClassNatives, true); 1622089Ssosdefine_pd_global(intx, InlineUnsafeOps, true); 1632089Ssosdefine_pd_global(intx, InitialCodeCacheSize, 160*K); 1642089Ssosdefine_pd_global(intx, ReservedCodeCacheSize, 32*M); 1652089Ssosdefine_pd_global(intx, CodeCacheExpansionSize, 32*K); 1662089Ssosdefine_pd_global(intx, CodeCacheMinBlockLength, 1); 16730764Scharnierdefine_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 1682089Ssosdefine_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 1692089Ssosdefine_pd_global(bool, NeverActAsServerClassMachine, true); 1702089Ssosdefine_pd_global(uint64_t,MaxRAM, 1ULL*G); 1712089Ssos#define CI_COMPILER_COUNT 0 1722089Ssos#else 1732089Ssos 1748857Srgrimes#ifdef COMPILER2 1752089Ssos#define CI_COMPILER_COUNT 2 1762089Ssos#else 1772089Ssos#define CI_COMPILER_COUNT 1 1782089Ssos#endif // COMPILER2 1792089Ssos 1802089Ssos#endif // no compilers 1812089Ssos 18275344Ssobomax 18375344Ssobomax// string type aliases used only in this file 18475344Ssobomaxtypedef const char* ccstr; 18575344Ssobomaxtypedef const char* ccstrlist; // represents string arguments which accumulate 18675344Ssobomax 18775344Ssobomaxenum FlagValueOrigin { 18875344Ssobomax DEFAULT = 0, 18975344Ssobomax COMMAND_LINE = 1, 19075344Ssobomax ENVIRON_VAR = 2, 19175344Ssobomax CONFIG_FILE = 3, 19275344Ssobomax MANAGEMENT = 4, 19375344Ssobomax ERGONOMIC = 5, 19475344Ssobomax ATTACH_ON_DEMAND = 6, 1958857Srgrimes INTERNAL = 99 1962089Ssos}; 1972089Ssos 19875344Ssobomaxstruct Flag { 19975344Ssobomax const char *type; 20075344Ssobomax const char *name; 2012089Ssos void* addr; 2022089Ssos 2032089Ssos NOT_PRODUCT(const char *doc;) 2042089Ssos 20575344Ssobomax const char *kind; 20675344Ssobomax FlagValueOrigin origin; 20775344Ssobomax 20875344Ssobomax // points to all Flags static array 20975344Ssobomax static Flag *flags; 21075344Ssobomax 21175344Ssobomax // number of flags 21275344Ssobomax static size_t numFlags; 21375344Ssobomax 2142089Ssos static Flag* find_flag(char* name, size_t length); 2152089Ssos 21623457Sbrian bool is_bool() const { return strcmp(type, "bool") == 0; } 21723457Sbrian bool get_bool() const { return *((bool*) addr); } 2182089Ssos void set_bool(bool value) { *((bool*) addr) = value; } 2192089Ssos 2202089Ssos bool is_intx() const { return strcmp(type, "intx") == 0; } 22175344Ssobomax intx get_intx() const { return *((intx*) addr); } 2222089Ssos void set_intx(intx value) { *((intx*) addr) = value; } 2232089Ssos 22475344Ssobomax bool is_uintx() const { return strcmp(type, "uintx") == 0; } 22575344Ssobomax uintx get_uintx() const { return *((uintx*) addr); } 22675344Ssobomax void set_uintx(uintx value) { *((uintx*) addr) = value; } 22775344Ssobomax 22875344Ssobomax bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 22975344Ssobomax uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 23075344Ssobomax void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 23175344Ssobomax 23275344Ssobomax bool is_double() const { return strcmp(type, "double") == 0; } 23375344Ssobomax double get_double() const { return *((double*) addr); } 23475344Ssobomax void set_double(double value) { *((double*) addr) = value; } 23575344Ssobomax 23675344Ssobomax bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 23775344Ssobomax bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 23875344Ssobomax ccstr get_ccstr() const { return *((ccstr*) addr); } 23975344Ssobomax void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 24075344Ssobomax 24175344Ssobomax bool is_unlocker() const; 24275344Ssobomax bool is_unlocked() const; 24375344Ssobomax bool is_writeable() const; 24475344Ssobomax bool is_external() const; 24575344Ssobomax 24675344Ssobomax void print_on(outputStream* st, bool withComments = false ); 24775344Ssobomax void print_as_flag(outputStream* st); 24875344Ssobomax}; 24975344Ssobomax 25075344Ssobomax// debug flags control various aspects of the VM and are global accessible 25175344Ssobomax 25275344Ssobomax// use FlagSetting to temporarily change some debug flag 25375344Ssobomax// e.g. FlagSetting fs(DebugThisAndThat, true); 25475344Ssobomax// restored to previous value upon leaving scope 25575344Ssobomaxclass FlagSetting { 25675344Ssobomax bool val; 25775344Ssobomax bool* flag; 25875344Ssobomax public: 25975344Ssobomax FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 26075344Ssobomax ~FlagSetting() { *flag = val; } 26175344Ssobomax}; 26275344Ssobomax 26375344Ssobomax 26475344Ssobomaxclass CounterSetting { 2652089Ssos intx* counter; 26675344Ssobomax public: 2672089Ssos CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 26875344Ssobomax ~CounterSetting() { (*counter)--; } 2692089Ssos}; 27075344Ssobomax 27175344Ssobomax 27223457Sbrianclass IntFlagSetting { 2732089Ssos intx val; 2742089Ssos intx* flag; 2752089Ssos public: 2762089Ssos IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 2772089Ssos ~IntFlagSetting() { *flag = val; } 27830764Scharnier}; 27923457Sbrian 2802089Ssos 2812089Ssosclass DoubleFlagSetting { 2822089Ssos double val; 2832089Ssos double* flag; 2842089Ssos public: 2852089Ssos DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 2862089Ssos ~DoubleFlagSetting() { *flag = val; } 2872089Ssos}; 2882089Ssos 2892089Ssos 2902089Ssosclass CommandLineFlags { 2912089Ssos public: 2922089Ssos static bool boolAt(char* name, size_t len, bool* value); 29330764Scharnier static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 2942089Ssos static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 2952089Ssos static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 2962089Ssos 2972089Ssos static bool intxAt(char* name, size_t len, intx* value); 29830764Scharnier static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 2992089Ssos static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 3002089Ssos static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 3012089Ssos 3025536Ssos static bool uintxAt(char* name, size_t len, uintx* value); 3032089Ssos static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 3045536Ssos static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 3052089Ssos static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 3066230Ssos 3076230Ssos static bool uint64_tAt(char* name, size_t len, uint64_t* value); 3086230Ssos static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 3095536Ssos static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 3106230Ssos static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 3116230Ssos 3125536Ssos static bool doubleAt(char* name, size_t len, double* value); 31330764Scharnier static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 3142089Ssos static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 3152089Ssos static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 3165536Ssos 3172089Ssos static bool ccstrAt(char* name, size_t len, ccstr* value); 3182089Ssos static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 31923457Sbrian static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 3202089Ssos static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 3212089Ssos 32239592Syokota // Returns false if name is not a command line flag. 32339592Syokota static bool wasSetOnCmdline(const char* name, bool* value); 32439592Syokota static void printSetFlags(); 32539592Syokota 32639592Syokota static void printFlags(bool withComments = false ); 32739592Syokota 32839592Syokota static void verify() PRODUCT_RETURN; 32939592Syokota}; 33039592Syokota 33139592Syokota// use this for flags that are true by default in the debug version but 33239592Syokota// false in the optimized version, and vice versa 33339592Syokota#ifdef ASSERT 33439592Syokota#define trueInDebug true 33539592Syokota#define falseInDebug false 33639592Syokota#else 33739592Syokota#define trueInDebug false 33839592Syokota#define falseInDebug true 33939592Syokota#endif 34039592Syokota 34148105Syokota// use this for flags that are true per default in the product build 34248105Syokota// but false in development builds, and vice versa 34348105Syokota#ifdef PRODUCT 34448105Syokota#define trueInProduct true 34548105Syokota#define falseInProduct false 34648105Syokota#else 34748105Syokota#define trueInProduct false 34839592Syokota#define falseInProduct true 34939592Syokota#endif 35039592Syokota 35139592Syokota// use this for flags that are true per default in the tiered build 35239592Syokota// but false in non-tiered builds, and vice versa 35339592Syokota#ifdef TIERED 35439592Syokota#define trueInTiered true 35539592Syokota#define falseInTiered false 35639592Syokota#else 35739592Syokota#define trueInTiered false 35842605Smjacob#define falseInTiered true 35948105Syokota#endif 36048105Syokota 36139287Ssos#ifdef JAVASE_EMBEDDED 36239592Syokota#define falseInEmbedded false 3632089Ssos#else 36448105Syokota#define falseInEmbedded true 36548105Syokota#endif 3662089Ssos 36739592Syokota// develop flags are settable / visible only during development and are constant in the PRODUCT version 36839592Syokota// product flags are always settable / visible 36939592Syokota// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 37039592Syokota 37139592Syokota// A flag must be declared with one of the following types: 37239592Syokota// bool, intx, uintx, ccstr. 37339592Syokota// The type "ccstr" is an alias for "const char*" and is used 3742089Ssos// only in this file, because the macrology requires single-token type names. 3752089Ssos 37630764Scharnier// Note: Diagnostic options not meant for VM tuning or for product modes. 37739287Ssos// They are to be used for VM quality assurance or field diagnosis 37871642Ssobomax// of VM bugs. They are hidden so that users will not be encouraged to 37971642Ssobomax// try them as if they were VM ordinary execution options. However, they 38071642Ssobomax// are available in the product version of the VM. Under instruction 38171642Ssobomax// from support engineers, VM customers can turn them on to collect 38271642Ssobomax// diagnostic information about VM problems. To use a VM diagnostic 38371642Ssobomax// option, you must first specify +UnlockDiagnosticVMOptions. 38471642Ssobomax// (This master switch also affects the behavior of -Xprintflags.) 38571642Ssobomax// 38671642Ssobomax// experimental flags are in support of features that are not 38771642Ssobomax// part of the officially supported product, but are available 38871642Ssobomax// for experimenting with. They could, for example, be performance 38971642Ssobomax// features that may not have undergone full or rigorous QA, but which may 39071642Ssobomax// help performance in some cases and released for experimentation 39171642Ssobomax// by the community of users and developers. This flag also allows one to 39271642Ssobomax// be able to build a fully supported product that nonetheless also 39371642Ssobomax// ships with some unsupported, lightly tested, experimental features. 39471642Ssobomax// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 39571642Ssobomax// UnlockExperimentalVMOptions flag, which allows the control and 39671642Ssobomax// modification of the experimental flags. 39748105Syokota// 39848105Syokota// Nota bene: neither diagnostic nor experimental options should be used casually, 39948105Syokota// and they are not supported on production loads, except under explicit 40048105Syokota// direction from support engineers. 40148105Syokota// 40248105Syokota// manageable flags are writeable external product flags. 40348105Syokota// They are dynamically writeable through the JDK management interface 40448105Syokota// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 40539287Ssos// These flags are external exported interface (see CCC). The list of 4062089Ssos// manageable flags can be queried programmatically through the management 4072089Ssos// interface. 4082089Ssos// 4092089Ssos// A flag can be made as "manageable" only if 4108857Srgrimes// - the flag is defined in a CCC as an external exported interface. 4112089Ssos// - the VM implementation supports dynamic setting of the flag. 4122089Ssos// This implies that the VM must *always* query the flag variable 4132089Ssos// and not reuse state related to the flag state at any given time. 4142089Ssos// - you want the flag to be queried programmatically by the customers. 4152089Ssos// 4162089Ssos// product_rw flags are writeable internal product flags. 4172089Ssos// They are like "manageable" flags but for internal/private use. 4182089Ssos// The list of product_rw flags are internal/private flags which 4192089Ssos// may be changed/removed in a future release. It can be set 4202089Ssos// through the management interface to get/set value 4212089Ssos// when the name of flag is supplied. 42223457Sbrian// 4232089Ssos// A flag can be made as "product_rw" only if 4242089Ssos// - the VM implementation supports dynamic setting of the flag. 4252089Ssos// This implies that the VM must *always* query the flag variable 4262089Ssos// and not reuse state related to the flag state at any given time. 4272089Ssos// 4282089Ssos// Note that when there is a need to support develop flags to be writeable, 4292089Ssos// it can be done in the same way as product_rw. 4308857Srgrimes 4318857Srgrimes#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 4322089Ssos \ 4332089Ssos lp64_product(bool, UseCompressedOops, false, \ 4342089Ssos "Use 32-bit object references in 64-bit VM. " \ 4352089Ssos "lp64_product means flag is always constant in 32 bit VM") \ 4362089Ssos \ 4372089Ssos notproduct(bool, CheckCompressedOops, true, \ 4382089Ssos "generate checks in encoding/decoding code in debug VM") \ 43923457Sbrian \ 4402089Ssos product_pd(uintx, HeapBaseMinAddress, \ 4412089Ssos "OS specific low limit for heap base address") \ 4422089Ssos \ 4432089Ssos diagnostic(bool, PrintCompressedOopsMode, false, \ 4442089Ssos "Print compressed oops base address and encoding mode") \ 4452089Ssos \ 4468857Srgrimes lp64_product(intx, ObjectAlignmentInBytes, 8, \ 4478857Srgrimes "Default object alignment in bytes, 8 is minimum") \ 4482089Ssos \ 4492089Ssos /* UseMembar is theoretically a temp flag used for memory barrier \ 4502089Ssos * removal testing. It was supposed to be removed before FCS but has \ 4512089Ssos * been re-added (see 6401008) */ \ 4522089Ssos product_pd(bool, UseMembar, \ 4532089Ssos "(Unstable) Issues membars on thread state transitions") \ 4542089Ssos \ 45523457Sbrian /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 45623457Sbrian * that don't support it. This will be replaced by processor detection \ 45723457Sbrian * logic. \ 45823457Sbrian */ \ 45923457Sbrian product(bool, UsePPCLWSYNC, true, \ 46023457Sbrian "Use lwsync instruction if true, else use slower sync") \ 46130764Scharnier \ 46223457Sbrian develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 46323457Sbrian "Whether to clean the chunk pool asynchronously") \ 46423457Sbrian \ 46523457Sbrian /* Temporary: See 6948537 */ \ 46651393Syokota experimental(bool, UseMemSetInBOT, true, \ 46730764Scharnier "(Unstable) uses memset in BOT updates in GC code") \ 46842605Smjacob \ 46930764Scharnier diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 47023457Sbrian "Enable normal processing of flags relating to field diagnostics")\ 47123457Sbrian \ 47223457Sbrian experimental(bool, UnlockExperimentalVMOptions, false, \ 4732089Ssos "Enable normal processing of flags relating to experimental features")\ 4742089Ssos \ 4752089Ssos product(bool, JavaMonitorsInStackTrace, true, \ 4762089Ssos "Print info. about Java monitor locks when the stacks are dumped")\ 4772089Ssos \ 4782089Ssos product_pd(bool, UseLargePages, \ 4792089Ssos "Use large page memory") \ 4802089Ssos \ 4818857Srgrimes product_pd(bool, UseLargePagesIndividualAllocation, \ 4822089Ssos "Allocate large pages individually for better affinity") \ 4832089Ssos \ 48416565Ssos develop(bool, LargePagesIndividualAllocationInjectError, false, \ 48555849Syokota "Fail large pages individual allocation") \ 48655849Syokota \ 48755849Syokota develop(bool, TracePageSizes, false, \ 48855849Syokota "Trace page size selection and usage.") \ 48955849Syokota \ 49055849Syokota product(bool, UseNUMA, false, \ 49175788Sache "Use NUMA if available") \ 49275788Sache \ 49355849Syokota product(bool, UseNUMAInterleaving, false, \ 49455849Syokota "Interleave memory across NUMA nodes if available") \ 49555849Syokota \ 49655849Syokota product(uintx, NUMAInterleaveGranularity, 2*M, \ 49755849Syokota "Granularity to use for NUMA interleaving on Windows OS") \ 49855849Syokota \ 49955849Syokota product(bool, ForceNUMA, false, \ 50055849Syokota "Force NUMA optimizations on single-node/UMA systems") \ 50116565Ssos \ 50216565Ssos product(intx, NUMAChunkResizeWeight, 20, \ 50316565Ssos "Percentage (0-100) used to weight the current sample when " \ 50416565Ssos "computing exponentially decaying average for " \ 50516565Ssos "AdaptiveNUMAChunkSizing") \ 50616565Ssos \ 50716565Ssos product(intx, NUMASpaceResizeRate, 1*G, \ 50816565Ssos "Do not reallocate more that this amount per collection") \ 50916565Ssos \ 51030764Scharnier product(bool, UseAdaptiveNUMAChunkSizing, true, \ 51116565Ssos "Enable adaptive chunk sizing for NUMA") \ 51216565Ssos \ 51316565Ssos product(bool, NUMAStats, false, \ 51416565Ssos "Print NUMA stats in detailed heap information") \ 51516565Ssos \ 51639287Ssos product(intx, NUMAPageScanRate, 256, \ 51739287Ssos "Maximum number of pages to include in the page scan procedure") \ 51839287Ssos \ 51939287Ssos product_pd(bool, NeedsDeoptSuspend, \ 52039287Ssos "True for register window machines (sparc/ia64)") \ 52139287Ssos \ 52239287Ssos product(intx, UseSSE, 99, \ 52339287Ssos "Highest supported SSE instructions set on x86/x64") \ 52439287Ssos \ 52539287Ssos product(intx, UseVIS, 99, \ 52639287Ssos "Highest supported VIS instructions set on Sparc") \ 52739287Ssos \ 52839287Ssos product(uintx, LargePageSizeInBytes, 0, \ 52948105Syokota "Large page size (0 to let VM choose the page size") \ 53039287Ssos \ 53139287Ssos product(uintx, LargePageHeapSizeThreshold, 128*M, \ 53239287Ssos "Use large pages if max heap is at least this big") \ 53339287Ssos \ 53439287Ssos product(bool, ForceTimeHighResolution, false, \ 53539287Ssos "Using high time resolution(For Win32 only)") \ 53639287Ssos \ 53739287Ssos develop(bool, TraceItables, false, \ 53839287Ssos "Trace initialization and use of itables") \ 53939287Ssos \ 54023457Sbrian develop(bool, TracePcPatching, false, \ 54139287Ssos "Trace usage of frame::patch_pc") \ 54239287Ssos \ 54342505Syokota develop(bool, TraceJumps, false, \ 54439287Ssos "Trace assembly jumps in thread ring buffer") \ 54539287Ssos \ 54639287Ssos develop(bool, TraceRelocator, false, \ 54739287Ssos "Trace the bytecode relocator") \ 54839287Ssos \ 54939287Ssos develop(bool, TraceLongCompiles, false, \ 55039287Ssos "Print out every time compilation is longer than " \ 55142505Syokota "a given threashold") \ 55242505Syokota \ 55342505Syokota develop(bool, SafepointALot, false, \ 55439287Ssos "Generates a lot of safepoints. Works with " \ 55542505Syokota "GuaranteedSafepointInterval") \ 55639287Ssos \ 55739287Ssos product_pd(bool, BackgroundCompilation, \ 55848105Syokota "A thread requesting compilation is not blocked during " \ 55948105Syokota "compilation") \ 56048105Syokota \ 56148105Syokota product(bool, PrintVMQWaitTime, false, \ 56248105Syokota "Prints out the waiting time in VM operation queue") \ 56348105Syokota \ 56448105Syokota develop(bool, BailoutToInterpreterForThrows, false, \ 56539287Ssos "Compiled methods which throws/catches exceptions will be " \ 56639287Ssos "deopt and intp.") \ 56739287Ssos \ 56839287Ssos develop(bool, NoYieldsInMicrolock, false, \ 56939287Ssos "Disable yields in microlock") \ 57039287Ssos \ 57139287Ssos develop(bool, TraceOopMapGeneration, false, \ 57239287Ssos "Shows oopmap generation") \ 57339287Ssos \ 57439287Ssos product(bool, MethodFlushing, true, \ 57539287Ssos "Reclamation of zombie and not-entrant methods") \ 57639287Ssos \ 57739287Ssos develop(bool, VerifyStack, false, \ 57839287Ssos "Verify stack of each thread when it is entering a runtime call") \ 57939287Ssos \ 58039287Ssos diagnostic(bool, ForceUnreachable, false, \ 58139287Ssos "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 58239287Ssos \ 58348105Syokota notproduct(bool, StressDerivedPointers, false, \ 58448105Syokota "Force scavenge when a derived pointers is detected on stack " \ 58539287Ssos "after rtm call") \ 58639287Ssos \ 58739287Ssos develop(bool, TraceDerivedPointers, false, \ 58839287Ssos "Trace traversal of derived pointers on stack") \ 58939287Ssos \ 59039287Ssos notproduct(bool, TraceCodeBlobStacks, false, \ 59139287Ssos "Trace stack-walk of codeblobs") \ 59239287Ssos \ 59339287Ssos product(bool, PrintJNIResolving, false, \ 59439287Ssos "Used to implement -v:jni") \ 59539287Ssos \ 59639287Ssos notproduct(bool, PrintRewrites, false, \ 59739287Ssos "Print methods that are being rewritten") \ 59839287Ssos \ 59939287Ssos product(bool, UseInlineCaches, true, \ 60039287Ssos "Use Inline Caches for virtual calls ") \ 60139287Ssos \ 60239287Ssos develop(bool, InlineArrayCopy, true, \ 60343186Sdfr "inline arraycopy native that is known to be part of " \ 60443186Sdfr "base library DLL") \ 60548105Syokota \ 60643186Sdfr develop(bool, InlineObjectHash, true, \ 60739287Ssos "inline Object::hashCode() native that is known to be part " \ 60839287Ssos "of base library DLL") \ 60939287Ssos \ 61039287Ssos develop(bool, InlineObjectCopy, true, \ 61139287Ssos "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 61239287Ssos \ 61339287Ssos develop(bool, InlineNatives, true, \ 61439287Ssos "inline natives that are known to be part of base library DLL") \ 61539287Ssos \ 61639287Ssos develop(bool, InlineMathNatives, true, \ 61739287Ssos "inline SinD, CosD, etc.") \ 61839287Ssos \ 61939287Ssos develop(bool, InlineClassNatives, true, \ 62039287Ssos "inline Class.isInstance, etc") \ 62139287Ssos \ 62239287Ssos develop(bool, InlineAtomicLong, true, \ 62339287Ssos "inline sun.misc.AtomicLong") \ 6242089Ssos \ 6252089Ssos develop(bool, InlineThreadNatives, true, \ 6262089Ssos "inline Thread.currentThread, etc") \ 6272089Ssos \ 6282089Ssos develop(bool, InlineReflectionGetCallerClass, true, \ 6292089Ssos "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 6302089Ssos "of base library DLL") \ 6312089Ssos \ 6322089Ssos develop(bool, InlineUnsafeOps, true, \ 6338857Srgrimes "inline memory ops (native methods) from sun.misc.Unsafe") \ 6348857Srgrimes \ 6352089Ssos develop(bool, ConvertCmpD2CmpF, true, \ 6362089Ssos "Convert cmpD to cmpF when one input is constant in float range") \ 6378857Srgrimes \ 6382089Ssos develop(bool, ConvertFloat2IntClipping, true, \ 6392089Ssos "Convert float2int clipping idiom to integer clipping") \ 6402089Ssos \ 64123457Sbrian develop(bool, SpecialStringCompareTo, true, \ 6422089Ssos "special version of string compareTo") \ 6432089Ssos \ 64475344Ssobomax develop(bool, SpecialStringIndexOf, true, \ 64575344Ssobomax "special version of string indexOf") \ 6462089Ssos \ 6478857Srgrimes develop(bool, SpecialStringEquals, true, \ 6482089Ssos "special version of string equals") \ 64930764Scharnier \ 65030764Scharnier develop(bool, SpecialArraysEquals, true, \ 65171642Ssobomax "special version of Arrays.equals(char[],char[])") \ 6522089Ssos \ 65316565Ssos product(bool, UseSSE42Intrinsics, false, \ 65416565Ssos "SSE4.2 versions of intrinsics") \ 65516565Ssos \ 6562089Ssos product(bool, UseCondCardMark, false, \ 6575536Ssos "Check for already marked card before updating card table") \ 6582089Ssos \ 6592089Ssos develop(bool, TraceCallFixup, false, \ 6602089Ssos "traces all call fixups") \ 6612089Ssos \ 6622089Ssos develop(bool, DeoptimizeALot, false, \ 66375344Ssobomax "deoptimize at every exit from the runtime system") \ 66475344Ssobomax \ 66575344Ssobomax notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 66675344Ssobomax "a comma separated list of bcis to deoptimize at") \ 66775344Ssobomax \ 66875344Ssobomax product(bool, DeoptimizeRandom, false, \ 66975344Ssobomax "deoptimize random frames on random exit from the runtime system")\ 6702089Ssos \ 67171642Ssobomax notproduct(bool, ZombieALot, false, \ 67271642Ssobomax "creates zombies (non-entrant) at exit from the runt. system") \ 67371642Ssobomax \ 67471642Ssobomax product(bool, UnlinkSymbolsALot, false, \ 67571642Ssobomax "unlink unreferenced symbols from the symbol table at safepoints")\ 67671642Ssobomax \ 67771642Ssobomax notproduct(bool, WalkStackALot, false, \ 67839287Ssos "trace stack (no print) at every exit from the runtime system") \ 67939287Ssos \ 68039287Ssos product(bool, Debugging, false, \ 6812089Ssos "set when executing debug methods in debug.ccp " \ 6822089Ssos "(to prevent triggering assertions)") \ 6832089Ssos \ 6842089Ssos notproduct(bool, StrictSafepointChecks, trueInDebug, \ 6852089Ssos "Enable strict checks that safepoints cannot happen for threads " \ 6862089Ssos "that used No_Safepoint_Verifier") \ 68755849Syokota \ 68855849Syokota notproduct(bool, VerifyLastFrame, false, \ 68955849Syokota "Verify oops on last frame on entry to VM") \ 69016565Ssos \ 69116565Ssos develop(bool, TraceHandleAllocation, false, \ 69216565Ssos "Prints out warnings when suspicious many handles are allocated") \ 6932089Ssos \ 6942089Ssos product(bool, UseCompilerSafepoints, true, \ 6952089Ssos "Stop at safepoints in compiled code") \ 69623457Sbrian \ 69723457Sbrian product(bool, UseSplitVerifier, true, \ 69823457Sbrian "use split verifier with StackMapTable attributes") \ 6992089Ssos \ 7002089Ssos product(bool, FailOverToOldVerifier, true, \ 7012089Ssos "fail over to old verifier when split verifier fails") \ 7022089Ssos \ 7032089Ssos develop(bool, ShowSafepointMsgs, false, \ 7042089Ssos "Show msg. about safepoint synch.") \ 7052089Ssos \ 7062089Ssos product(bool, SafepointTimeout, false, \ 7072089Ssos "Time out and warn or fail after SafepointTimeoutDelay " \ 70823457Sbrian "milliseconds if failed to reach safepoint") \ 70923457Sbrian \ 7102089Ssos develop(bool, DieOnSafepointTimeout, false, \ 7112089Ssos "Die upon failure to reach safepoint (see SafepointTimeout)") \ 7122089Ssos \ 7132089Ssos /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 71430764Scharnier /* typically, at most a few retries are needed */ \ 7152089Ssos product(intx, SuspendRetryCount, 50, \ 71623457Sbrian "Maximum retry count for an external suspend request") \ 7172089Ssos \ 7182089Ssos product(intx, SuspendRetryDelay, 5, \ 719 "Milliseconds to delay per retry (* current_retry_count)") \ 720 \ 721 product(bool, AssertOnSuspendWaitFailure, false, \ 722 "Assert/Guarantee on external suspend wait failure") \ 723 \ 724 product(bool, TraceSuspendWaitFailures, false, \ 725 "Trace external suspend wait failures") \ 726 \ 727 product(bool, MaxFDLimit, true, \ 728 "Bump the number of file descriptors to max in solaris.") \ 729 \ 730 notproduct(bool, LogEvents, trueInDebug, \ 731 "Enable Event log") \ 732 \ 733 product(bool, BytecodeVerificationRemote, true, \ 734 "Enables the Java bytecode verifier for remote classes") \ 735 \ 736 product(bool, BytecodeVerificationLocal, false, \ 737 "Enables the Java bytecode verifier for local classes") \ 738 \ 739 develop(bool, ForceFloatExceptions, trueInDebug, \ 740 "Force exceptions on FP stack under/overflow") \ 741 \ 742 develop(bool, SoftMatchFailure, trueInProduct, \ 743 "If the DFA fails to match a node, print a message and bail out") \ 744 \ 745 develop(bool, VerifyStackAtCalls, false, \ 746 "Verify that the stack pointer is unchanged after calls") \ 747 \ 748 develop(bool, TraceJavaAssertions, false, \ 749 "Trace java language assertions") \ 750 \ 751 notproduct(bool, CheckAssertionStatusDirectives, false, \ 752 "temporary - see javaClasses.cpp") \ 753 \ 754 notproduct(bool, PrintMallocFree, false, \ 755 "Trace calls to C heap malloc/free allocation") \ 756 \ 757 product(bool, PrintOopAddress, false, \ 758 "Always print the location of the oop") \ 759 \ 760 notproduct(bool, VerifyCodeCacheOften, false, \ 761 "Verify compiled-code cache often") \ 762 \ 763 develop(bool, ZapDeadCompiledLocals, false, \ 764 "Zap dead locals in compiler frames") \ 765 \ 766 notproduct(bool, ZapDeadLocalsOld, false, \ 767 "Zap dead locals (old version, zaps all frames when " \ 768 "entering the VM") \ 769 \ 770 notproduct(bool, CheckOopishValues, false, \ 771 "Warn if value contains oop ( requires ZapDeadLocals)") \ 772 \ 773 develop(bool, UseMallocOnly, false, \ 774 "use only malloc/free for allocation (no resource area/arena)") \ 775 \ 776 develop(bool, PrintMalloc, false, \ 777 "print all malloc/free calls") \ 778 \ 779 develop(bool, PrintMallocStatistics, false, \ 780 "print malloc/free statistics") \ 781 \ 782 develop(bool, ZapResourceArea, trueInDebug, \ 783 "Zap freed resource/arena space with 0xABABABAB") \ 784 \ 785 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 786 "Zap freed VM handle space with 0xBCBCBCBC") \ 787 \ 788 develop(bool, ZapJNIHandleArea, trueInDebug, \ 789 "Zap freed JNI handle space with 0xFEFEFEFE") \ 790 \ 791 notproduct(bool, ZapStackSegments, trueInDebug, \ 792 "Zap allocated/freed Stack segments with 0xFADFADED") \ 793 \ 794 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 795 "Zap unused heap space with 0xBAADBABE") \ 796 \ 797 develop(bool, TraceZapUnusedHeapArea, false, \ 798 "Trace zapping of unused heap space") \ 799 \ 800 develop(bool, CheckZapUnusedHeapArea, false, \ 801 "Check zapping of unused heap space") \ 802 \ 803 develop(bool, ZapFillerObjects, trueInDebug, \ 804 "Zap filler objects with 0xDEAFBABE") \ 805 \ 806 develop(bool, PrintVMMessages, true, \ 807 "Print vm messages on console") \ 808 \ 809 product(bool, PrintGCApplicationConcurrentTime, false, \ 810 "Print the time the application has been running") \ 811 \ 812 product(bool, PrintGCApplicationStoppedTime, false, \ 813 "Print the time the application has been stopped") \ 814 \ 815 notproduct(uintx, ErrorHandlerTest, 0, \ 816 "If > 0, provokes an error after VM initialization; the value" \ 817 "determines which error to provoke. See test_error_handler()" \ 818 "in debug.cpp.") \ 819 \ 820 develop(bool, Verbose, false, \ 821 "Prints additional debugging information from other modes") \ 822 \ 823 develop(bool, PrintMiscellaneous, false, \ 824 "Prints uncategorized debugging information (requires +Verbose)") \ 825 \ 826 develop(bool, WizardMode, false, \ 827 "Prints much more debugging information") \ 828 \ 829 product(bool, ShowMessageBoxOnError, false, \ 830 "Keep process alive on VM fatal error") \ 831 \ 832 product(bool, CreateMinidumpOnCrash, false, \ 833 "Create minidump on VM fatal error") \ 834 \ 835 product_pd(bool, UseOSErrorReporting, \ 836 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 837 \ 838 product(bool, SuppressFatalErrorMessage, false, \ 839 "Do NO Fatal Error report [Avoid deadlock]") \ 840 \ 841 product(ccstrlist, OnError, "", \ 842 "Run user-defined commands on fatal error; see VMError.cpp " \ 843 "for examples") \ 844 \ 845 product(ccstrlist, OnOutOfMemoryError, "", \ 846 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 847 \ 848 manageable(bool, HeapDumpBeforeFullGC, false, \ 849 "Dump heap to file before any major stop-world GC") \ 850 \ 851 manageable(bool, HeapDumpAfterFullGC, false, \ 852 "Dump heap to file after any major stop-world GC") \ 853 \ 854 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 855 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 856 \ 857 manageable(ccstr, HeapDumpPath, NULL, \ 858 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 859 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 860 "in the working directory)") \ 861 \ 862 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 863 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 864 "when the heap usage is larger than this") \ 865 \ 866 develop(uintx, HeapDumpSegmentSize, 1*G, \ 867 "Approximate segment size when generating a segmented heap dump") \ 868 \ 869 develop(bool, BreakAtWarning, false, \ 870 "Execute breakpoint upon encountering VM warning") \ 871 \ 872 product_pd(bool, UseVectoredExceptions, \ 873 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 874 \ 875 develop(bool, TraceVMOperation, false, \ 876 "Trace vm operations") \ 877 \ 878 develop(bool, UseFakeTimers, false, \ 879 "Tells whether the VM should use system time or a fake timer") \ 880 \ 881 diagnostic(bool, LogCompilation, false, \ 882 "Log compilation activity in detail to hotspot.log or LogFile") \ 883 \ 884 product(bool, PrintCompilation, false, \ 885 "Print compilations") \ 886 \ 887 diagnostic(bool, TraceNMethodInstalls, false, \ 888 "Trace nmethod intallation") \ 889 \ 890 diagnostic(intx, ScavengeRootsInCode, 1, \ 891 "0: do not allow scavengable oops in the code cache; " \ 892 "1: allow scavenging from the code cache; " \ 893 "2: emit as many constants as the compiler can see") \ 894 \ 895 diagnostic(bool, TraceOSRBreakpoint, false, \ 896 "Trace OSR Breakpoint ") \ 897 \ 898 diagnostic(bool, TraceCompileTriggered, false, \ 899 "Trace compile triggered") \ 900 \ 901 diagnostic(bool, TraceTriggers, false, \ 902 "Trace triggers") \ 903 \ 904 product(bool, AlwaysRestoreFPU, false, \ 905 "Restore the FPU control word after every JNI call (expensive)") \ 906 \ 907 diagnostic(bool, PrintCompilation2, false, \ 908 "Print additional statistics per compilation") \ 909 \ 910 diagnostic(bool, PrintAdapterHandlers, false, \ 911 "Print code generated for i2c/c2i adapters") \ 912 \ 913 develop(bool, VerifyAdapterSharing, false, \ 914 "Verify that the code for shared adapters is the equivalent") \ 915 \ 916 diagnostic(bool, PrintAssembly, false, \ 917 "Print assembly code (using external disassembler.so)") \ 918 \ 919 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 920 "Options string passed to disassembler.so") \ 921 \ 922 diagnostic(bool, PrintNMethods, false, \ 923 "Print assembly code for nmethods when generated") \ 924 \ 925 diagnostic(bool, PrintNativeNMethods, false, \ 926 "Print assembly code for native nmethods when generated") \ 927 \ 928 develop(bool, PrintDebugInfo, false, \ 929 "Print debug information for all nmethods when generated") \ 930 \ 931 develop(bool, PrintRelocations, false, \ 932 "Print relocation information for all nmethods when generated") \ 933 \ 934 develop(bool, PrintDependencies, false, \ 935 "Print dependency information for all nmethods when generated") \ 936 \ 937 develop(bool, PrintExceptionHandlers, false, \ 938 "Print exception handler tables for all nmethods when generated") \ 939 \ 940 develop(bool, InterceptOSException, false, \ 941 "Starts debugger when an implicit OS (e.g., NULL) " \ 942 "exception happens") \ 943 \ 944 notproduct(bool, PrintCodeCache, false, \ 945 "Print the compiled_code cache when exiting") \ 946 \ 947 develop(bool, PrintCodeCache2, false, \ 948 "Print detailed info on the compiled_code cache when exiting") \ 949 \ 950 diagnostic(bool, PrintStubCode, false, \ 951 "Print generated stub code") \ 952 \ 953 product(bool, StackTraceInThrowable, true, \ 954 "Collect backtrace in throwable when exception happens") \ 955 \ 956 product(bool, OmitStackTraceInFastThrow, true, \ 957 "Omit backtraces for some 'hot' exceptions in optimized code") \ 958 \ 959 product(bool, ProfilerPrintByteCodeStatistics, false, \ 960 "Prints byte code statictics when dumping profiler output") \ 961 \ 962 product(bool, ProfilerRecordPC, false, \ 963 "Collects tick for each 16 byte interval of compiled code") \ 964 \ 965 product(bool, ProfileVM, false, \ 966 "Profiles ticks that fall within VM (either in the VM Thread " \ 967 "or VM code called through stubs)") \ 968 \ 969 product(bool, ProfileIntervals, false, \ 970 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 971 \ 972 notproduct(bool, ProfilerCheckIntervals, false, \ 973 "Collect and print info on spacing of profiler ticks") \ 974 \ 975 develop(bool, PrintJVMWarnings, false, \ 976 "Prints warnings for unimplemented JVM functions") \ 977 \ 978 product(bool, PrintWarnings, true, \ 979 "Prints JVM warnings to output stream") \ 980 \ 981 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 982 "Prints warnings for stalled SpinLocks") \ 983 \ 984 develop(bool, InitializeJavaLangSystem, true, \ 985 "Initialize java.lang.System - turn off for individual " \ 986 "method debugging") \ 987 \ 988 develop(bool, InitializeJavaLangString, true, \ 989 "Initialize java.lang.String - turn off for individual " \ 990 "method debugging") \ 991 \ 992 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 993 "Initialize various error and exception classes - turn off for " \ 994 "individual method debugging") \ 995 \ 996 product(bool, RegisterFinalizersAtInit, true, \ 997 "Register finalizable objects at end of Object.<init> or " \ 998 "after allocation") \ 999 \ 1000 develop(bool, RegisterReferences, true, \ 1001 "Tells whether the VM should register soft/weak/final/phantom " \ 1002 "references") \ 1003 \ 1004 develop(bool, IgnoreRewrites, false, \ 1005 "Supress rewrites of bytecodes in the oopmap generator. " \ 1006 "This is unsafe!") \ 1007 \ 1008 develop(bool, PrintCodeCacheExtension, false, \ 1009 "Print extension of code cache") \ 1010 \ 1011 develop(bool, UsePrivilegedStack, true, \ 1012 "Enable the security JVM functions") \ 1013 \ 1014 develop(bool, IEEEPrecision, true, \ 1015 "Enables IEEE precision (for INTEL only)") \ 1016 \ 1017 develop(bool, ProtectionDomainVerification, true, \ 1018 "Verifies protection domain before resolution in system " \ 1019 "dictionary") \ 1020 \ 1021 product(bool, ClassUnloading, true, \ 1022 "Do unloading of classes") \ 1023 \ 1024 diagnostic(bool, LinkWellKnownClasses, false, \ 1025 "Resolve a well known class as soon as its name is seen") \ 1026 \ 1027 develop(bool, DisableStartThread, false, \ 1028 "Disable starting of additional Java threads " \ 1029 "(for debugging only)") \ 1030 \ 1031 develop(bool, MemProfiling, false, \ 1032 "Write memory usage profiling to log file") \ 1033 \ 1034 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1035 "Prints the system dictionary at exit") \ 1036 \ 1037 diagnostic(bool, UnsyncloadClass, false, \ 1038 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1039 "class loader must call VM synchronized for findClass " \ 1040 "and defineClass.") \ 1041 \ 1042 product(bool, AlwaysLockClassLoader, false, \ 1043 "Require the VM to acquire the class loader lock before calling " \ 1044 "loadClass() even for class loaders registering " \ 1045 "as parallel capable") \ 1046 \ 1047 product(bool, AllowParallelDefineClass, false, \ 1048 "Allow parallel defineClass requests for class loaders " \ 1049 "registering as parallel capable") \ 1050 \ 1051 product(bool, MustCallLoadClassInternal, false, \ 1052 "Call loadClassInternal() rather than loadClass()") \ 1053 \ 1054 product_pd(bool, DontYieldALot, \ 1055 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1056 \ 1057 product_pd(bool, ConvertSleepToYield, \ 1058 "Converts sleep(0) to thread yield " \ 1059 "(may be off for SOLARIS to improve GUI)") \ 1060 \ 1061 product(bool, ConvertYieldToSleep, false, \ 1062 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1063 "behavior (SOLARIS only)") \ 1064 \ 1065 product(bool, UseBoundThreads, true, \ 1066 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1067 \ 1068 develop(bool, UseDetachedThreads, true, \ 1069 "Use detached threads that are recycled upon termination " \ 1070 "(for SOLARIS only)") \ 1071 \ 1072 product(bool, UseLWPSynchronization, true, \ 1073 "Use LWP-based instead of libthread-based synchronization " \ 1074 "(SPARC only)") \ 1075 \ 1076 product(ccstr, SyncKnobs, NULL, \ 1077 "(Unstable) Various monitor synchronization tunables") \ 1078 \ 1079 product(intx, EmitSync, 0, \ 1080 "(Unsafe,Unstable) " \ 1081 " Controls emission of inline sync fast-path code") \ 1082 \ 1083 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1084 \ 1085 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1086 \ 1087 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1088 \ 1089 product(intx, Atomics, 0, \ 1090 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1091 \ 1092 product(intx, FenceInstruction, 0, \ 1093 "(Unsafe,Unstable) Experimental") \ 1094 \ 1095 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1096 \ 1097 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1098 \ 1099 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1100 \ 1101 product(intx, hashCode, 0, \ 1102 "(Unstable) select hashCode generation algorithm" ) \ 1103 \ 1104 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1105 "(Unstable, Linux-specific)" \ 1106 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1107 \ 1108 product(bool, FilterSpuriousWakeups, true, \ 1109 "Prevent spurious or premature wakeups from object.wait " \ 1110 "(Solaris only)") \ 1111 \ 1112 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1113 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1114 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1115 \ 1116 develop(bool, UsePthreads, false, \ 1117 "Use pthread-based instead of libthread-based synchronization " \ 1118 "(SPARC only)") \ 1119 \ 1120 product(bool, AdjustConcurrency, false, \ 1121 "call thr_setconcurrency at thread create time to avoid " \ 1122 "LWP starvation on MP systems (For Solaris Only)") \ 1123 \ 1124 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1125 "Should the system attempt to update the compiler file when " \ 1126 "an error occurs?") \ 1127 \ 1128 product(bool, ReduceSignalUsage, false, \ 1129 "Reduce the use of OS signals in Java and/or the VM") \ 1130 \ 1131 notproduct(bool, ValidateMarkSweep, false, \ 1132 "Do extra validation during MarkSweep collection") \ 1133 \ 1134 notproduct(bool, RecordMarkSweepCompaction, false, \ 1135 "Enable GC-to-GC recording and querying of compaction during " \ 1136 "MarkSweep") \ 1137 \ 1138 develop_pd(bool, ShareVtableStubs, \ 1139 "Share vtable stubs (smaller code but worse branch prediction") \ 1140 \ 1141 develop(bool, LoadLineNumberTables, true, \ 1142 "Tells whether the class file parser loads line number tables") \ 1143 \ 1144 develop(bool, LoadLocalVariableTables, true, \ 1145 "Tells whether the class file parser loads local variable tables")\ 1146 \ 1147 develop(bool, LoadLocalVariableTypeTables, true, \ 1148 "Tells whether the class file parser loads local variable type tables")\ 1149 \ 1150 product(bool, AllowUserSignalHandlers, false, \ 1151 "Do not complain if the application installs signal handlers " \ 1152 "(Solaris & Linux only)") \ 1153 \ 1154 product(bool, UseSignalChaining, true, \ 1155 "Use signal-chaining to invoke signal handlers installed " \ 1156 "by the application (Solaris & Linux only)") \ 1157 \ 1158 product(bool, UseAltSigs, false, \ 1159 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1160 "internal signals (Solaris only)") \ 1161 \ 1162 product(bool, UseSpinning, false, \ 1163 "Use spinning in monitor inflation and before entry") \ 1164 \ 1165 product(bool, PreSpinYield, false, \ 1166 "Yield before inner spinning loop") \ 1167 \ 1168 product(bool, PostSpinYield, true, \ 1169 "Yield after inner spinning loop") \ 1170 \ 1171 product(bool, AllowJNIEnvProxy, false, \ 1172 "Allow JNIEnv proxies for jdbx") \ 1173 \ 1174 product(bool, JNIDetachReleasesMonitors, true, \ 1175 "JNI DetachCurrentThread releases monitors owned by thread") \ 1176 \ 1177 product(bool, RestoreMXCSROnJNICalls, false, \ 1178 "Restore MXCSR when returning from JNI calls") \ 1179 \ 1180 product(bool, CheckJNICalls, false, \ 1181 "Verify all arguments to JNI calls") \ 1182 \ 1183 product(bool, UseFastJNIAccessors, true, \ 1184 "Use optimized versions of Get<Primitive>Field") \ 1185 \ 1186 product(bool, EagerXrunInit, false, \ 1187 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1188 " but not all -Xrun libraries may support the state of the VM at this time") \ 1189 \ 1190 product(bool, PreserveAllAnnotations, false, \ 1191 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1192 \ 1193 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1194 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1195 \ 1196 product(bool, LazyBootClassLoader, true, \ 1197 "Enable/disable lazy opening of boot class path entries") \ 1198 \ 1199 diagnostic(bool, UseIncDec, true, \ 1200 "Use INC, DEC instructions on x86") \ 1201 \ 1202 product(bool, UseNewLongLShift, false, \ 1203 "Use optimized bitwise shift left") \ 1204 \ 1205 product(bool, UseStoreImmI16, true, \ 1206 "Use store immediate 16-bits value instruction on x86") \ 1207 \ 1208 product(bool, UseAddressNop, false, \ 1209 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1210 \ 1211 product(bool, UseXmmLoadAndClearUpper, true, \ 1212 "Load low part of XMM register and clear upper part") \ 1213 \ 1214 product(bool, UseXmmRegToRegMoveAll, false, \ 1215 "Copy all XMM register bits when moving value between registers") \ 1216 \ 1217 product(bool, UseXmmI2D, false, \ 1218 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1219 \ 1220 product(bool, UseXmmI2F, false, \ 1221 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1222 \ 1223 product(bool, UseXMMForArrayCopy, false, \ 1224 "Use SSE2 MOVQ instruction for Arraycopy") \ 1225 \ 1226 product(bool, UseUnalignedLoadStores, false, \ 1227 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1228 \ 1229 product(bool, UseCBCond, false, \ 1230 "Use compare and branch instruction on SPARC") \ 1231 \ 1232 product(intx, FieldsAllocationStyle, 1, \ 1233 "0 - type based with oops first, 1 - with oops last, " \ 1234 "2 - oops in super and sub classes are together") \ 1235 \ 1236 product(bool, CompactFields, true, \ 1237 "Allocate nonstatic fields in gaps between previous fields") \ 1238 \ 1239 notproduct(bool, PrintCompactFieldsSavings, false, \ 1240 "Print how many words were saved with CompactFields") \ 1241 \ 1242 product(bool, UseBiasedLocking, true, \ 1243 "Enable biased locking in JVM") \ 1244 \ 1245 product(intx, BiasedLockingStartupDelay, 4000, \ 1246 "Number of milliseconds to wait before enabling biased locking") \ 1247 \ 1248 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1249 "Print statistics of biased locking in JVM") \ 1250 \ 1251 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1252 "Threshold of number of revocations per type to try to " \ 1253 "rebias all objects in the heap of that type") \ 1254 \ 1255 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1256 "Threshold of number of revocations per type to permanently " \ 1257 "revoke biases of all objects in the heap of that type") \ 1258 \ 1259 product(intx, BiasedLockingDecayTime, 25000, \ 1260 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1261 "type after previous bulk rebias") \ 1262 \ 1263 develop(bool, JavaObjectsInPerm, false, \ 1264 "controls whether Classes and interned Strings are allocated" \ 1265 "in perm. This purely intended to allow debugging issues" \ 1266 "in production.") \ 1267 \ 1268 /* tracing */ \ 1269 \ 1270 notproduct(bool, TraceRuntimeCalls, false, \ 1271 "Trace run-time calls") \ 1272 \ 1273 develop(bool, TraceJNICalls, false, \ 1274 "Trace JNI calls") \ 1275 \ 1276 notproduct(bool, TraceJVMCalls, false, \ 1277 "Trace JVM calls") \ 1278 \ 1279 product(ccstr, TraceJVMTI, NULL, \ 1280 "Trace flags for JVMTI functions and events") \ 1281 \ 1282 /* This option can change an EMCP method into an obsolete method. */ \ 1283 /* This can affect tests that except specific methods to be EMCP. */ \ 1284 /* This option should be used with caution. */ \ 1285 product(bool, StressLdcRewrite, false, \ 1286 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1287 \ 1288 product(intx, TraceRedefineClasses, 0, \ 1289 "Trace level for JVMTI RedefineClasses") \ 1290 \ 1291 develop(bool, StressMethodComparator, false, \ 1292 "run the MethodComparator on all loaded methods") \ 1293 \ 1294 /* change to false by default sometime after Mustang */ \ 1295 product(bool, VerifyMergedCPBytecodes, true, \ 1296 "Verify bytecodes after RedefineClasses constant pool merging") \ 1297 \ 1298 develop(bool, TraceJNIHandleAllocation, false, \ 1299 "Trace allocation/deallocation of JNI handle blocks") \ 1300 \ 1301 develop(bool, TraceThreadEvents, false, \ 1302 "Trace all thread events") \ 1303 \ 1304 develop(bool, TraceBytecodes, false, \ 1305 "Trace bytecode execution") \ 1306 \ 1307 develop(bool, TraceClassInitialization, false, \ 1308 "Trace class initialization") \ 1309 \ 1310 develop(bool, TraceExceptions, false, \ 1311 "Trace exceptions") \ 1312 \ 1313 develop(bool, TraceICs, false, \ 1314 "Trace inline cache changes") \ 1315 \ 1316 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1317 "Trace method invocation counter overflow") \ 1318 \ 1319 develop(bool, TraceInlineCacheClearing, false, \ 1320 "Trace clearing of inline caches in nmethods") \ 1321 \ 1322 develop(bool, TraceDependencies, false, \ 1323 "Trace dependencies") \ 1324 \ 1325 develop(bool, VerifyDependencies, trueInDebug, \ 1326 "Exercise and verify the compilation dependency mechanism") \ 1327 \ 1328 develop(bool, TraceNewOopMapGeneration, false, \ 1329 "Trace OopMapGeneration") \ 1330 \ 1331 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1332 "Trace OopMapGeneration: print detailed cell states") \ 1333 \ 1334 develop(bool, TimeOopMap, false, \ 1335 "Time calls to GenerateOopMap::compute_map() in sum") \ 1336 \ 1337 develop(bool, TimeOopMap2, false, \ 1338 "Time calls to GenerateOopMap::compute_map() individually") \ 1339 \ 1340 develop(bool, TraceMonitorMismatch, false, \ 1341 "Trace monitor matching failures during OopMapGeneration") \ 1342 \ 1343 develop(bool, TraceOopMapRewrites, false, \ 1344 "Trace rewritting of method oops during oop map generation") \ 1345 \ 1346 develop(bool, TraceSafepoint, false, \ 1347 "Trace safepoint operations") \ 1348 \ 1349 develop(bool, TraceICBuffer, false, \ 1350 "Trace usage of IC buffer") \ 1351 \ 1352 develop(bool, TraceCompiledIC, false, \ 1353 "Trace changes of compiled IC") \ 1354 \ 1355 notproduct(bool, TraceZapDeadLocals, false, \ 1356 "Trace zapping dead locals") \ 1357 \ 1358 develop(bool, TraceStartupTime, false, \ 1359 "Trace setup time") \ 1360 \ 1361 product(ccstr, HPILibPath, NULL, \ 1362 "Specify alternate path to HPI library") \ 1363 \ 1364 develop(bool, TraceProtectionDomainVerification, false, \ 1365 "Trace protection domain verifcation") \ 1366 \ 1367 develop(bool, TraceClearedExceptions, false, \ 1368 "Prints when an exception is forcibly cleared") \ 1369 \ 1370 product(bool, TraceClassResolution, false, \ 1371 "Trace all constant pool resolutions (for debugging)") \ 1372 \ 1373 product(bool, TraceBiasedLocking, false, \ 1374 "Trace biased locking in JVM") \ 1375 \ 1376 product(bool, TraceMonitorInflation, false, \ 1377 "Trace monitor inflation in JVM") \ 1378 \ 1379 /* assembler */ \ 1380 product(bool, Use486InstrsOnly, false, \ 1381 "Use 80486 Compliant instruction subset") \ 1382 \ 1383 /* gc */ \ 1384 \ 1385 product(bool, UseSerialGC, false, \ 1386 "Use the serial garbage collector") \ 1387 \ 1388 product(bool, UseG1GC, false, \ 1389 "Use the Garbage-First garbage collector") \ 1390 \ 1391 product(bool, UseParallelGC, false, \ 1392 "Use the Parallel Scavenge garbage collector") \ 1393 \ 1394 product(bool, UseParallelOldGC, false, \ 1395 "Use the Parallel Old garbage collector") \ 1396 \ 1397 product(uintx, HeapMaximumCompactionInterval, 20, \ 1398 "How often should we maximally compact the heap (not allowing " \ 1399 "any dead space)") \ 1400 \ 1401 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1402 "The collection count for the first maximum compaction") \ 1403 \ 1404 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1405 "In the Parallel Old garbage collector maximum compaction for " \ 1406 "a system GC") \ 1407 \ 1408 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1409 "The mean used by the par compact dead wood" \ 1410 "limiter (a number between 0-100).") \ 1411 \ 1412 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1413 "The standard deviation used by the par compact dead wood" \ 1414 "limiter (a number between 0-100).") \ 1415 \ 1416 product(uintx, ParallelGCThreads, 0, \ 1417 "Number of parallel threads parallel gc will use") \ 1418 \ 1419 product(bool, UseDynamicNumberOfGCThreads, false, \ 1420 "Dynamically choose the number of parallel threads " \ 1421 "parallel gc will use") \ 1422 \ 1423 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1424 "Force dynamic selection of the number of" \ 1425 "parallel threads parallel gc will use to aid debugging") \ 1426 \ 1427 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1428 "Size of heap (bytes) per GC thread used in calculating the " \ 1429 "number of GC threads") \ 1430 \ 1431 product(bool, TraceDynamicGCThreads, false, \ 1432 "Trace the dynamic GC thread usage") \ 1433 \ 1434 develop(bool, ParallelOldGCSplitALot, false, \ 1435 "Provoke splitting (copying data from a young gen space to" \ 1436 "multiple destination spaces)") \ 1437 \ 1438 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1439 "How often to provoke splitting a young gen space") \ 1440 \ 1441 develop(bool, TraceRegionTasksQueuing, false, \ 1442 "Trace the queuing of the region tasks") \ 1443 \ 1444 product(uintx, ConcGCThreads, 0, \ 1445 "Number of threads concurrent gc will use") \ 1446 \ 1447 product(uintx, YoungPLABSize, 4096, \ 1448 "Size of young gen promotion labs (in HeapWords)") \ 1449 \ 1450 product(uintx, OldPLABSize, 1024, \ 1451 "Size of old gen promotion labs (in HeapWords)") \ 1452 \ 1453 product(uintx, GCTaskTimeStampEntries, 200, \ 1454 "Number of time stamp entries per gc worker thread") \ 1455 \ 1456 product(bool, AlwaysTenure, false, \ 1457 "Always tenure objects in eden. (ParallelGC only)") \ 1458 \ 1459 product(bool, NeverTenure, false, \ 1460 "Never tenure objects in eden, May tenure on overflow " \ 1461 "(ParallelGC only)") \ 1462 \ 1463 product(bool, ScavengeBeforeFullGC, true, \ 1464 "Scavenge youngest generation before each full GC, " \ 1465 "used with UseParallelGC") \ 1466 \ 1467 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1468 "Allow scavenges to occur when to_space contains objects.") \ 1469 \ 1470 product(bool, UseConcMarkSweepGC, false, \ 1471 "Use Concurrent Mark-Sweep GC in the old generation") \ 1472 \ 1473 product(bool, ExplicitGCInvokesConcurrent, false, \ 1474 "A System.gc() request invokes a concurrent collection;" \ 1475 " (effective only when UseConcMarkSweepGC)") \ 1476 \ 1477 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1478 "A System.gc() request invokes a concurrent collection and " \ 1479 "also unloads classes during such a concurrent gc cycle " \ 1480 "(effective only when UseConcMarkSweepGC)") \ 1481 \ 1482 product(bool, GCLockerInvokesConcurrent, false, \ 1483 "The exit of a JNI CS necessitating a scavenge also" \ 1484 " kicks off a bkgrd concurrent collection") \ 1485 \ 1486 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1487 "How much the GC can expand the eden by while the GC locker " \ 1488 "is active (as a percentage)") \ 1489 \ 1490 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1491 "Use Adaptive Free Lists in the CMS generation") \ 1492 \ 1493 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1494 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1495 \ 1496 develop(bool, RotateCMSCollectionTypes, false, \ 1497 "Rotate the CMS collections among concurrent and STW") \ 1498 \ 1499 product(bool, UseCMSBestFit, true, \ 1500 "Use CMS best fit allocation strategy") \ 1501 \ 1502 product(bool, UseCMSCollectionPassing, true, \ 1503 "Use passing of collection from background to foreground") \ 1504 \ 1505 product(bool, UseParNewGC, false, \ 1506 "Use parallel threads in the new generation.") \ 1507 \ 1508 product(bool, ParallelGCVerbose, false, \ 1509 "Verbose output for parallel GC.") \ 1510 \ 1511 product(intx, ParallelGCBufferWastePct, 10, \ 1512 "wasted fraction of parallel allocation buffer.") \ 1513 \ 1514 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1515 "Retain parallel allocation buffers across scavenges; " \ 1516 " -- disabled because this currently conflicts with " \ 1517 " parallel card scanning under certain conditions ") \ 1518 \ 1519 product(intx, TargetPLABWastePct, 10, \ 1520 "target wasted space in last buffer as pct of overall allocation")\ 1521 \ 1522 product(uintx, PLABWeight, 75, \ 1523 "Percentage (0-100) used to weight the current sample when" \ 1524 "computing exponentially decaying average for ResizePLAB.") \ 1525 \ 1526 product(bool, ResizePLAB, true, \ 1527 "Dynamically resize (survivor space) promotion labs") \ 1528 \ 1529 product(bool, PrintPLAB, false, \ 1530 "Print (survivor space) promotion labs sizing decisions") \ 1531 \ 1532 product(intx, ParGCArrayScanChunk, 50, \ 1533 "Scan a subset and push remainder, if array is bigger than this") \ 1534 \ 1535 product(bool, ParGCUseLocalOverflow, false, \ 1536 "Instead of a global overflow list, use local overflow stacks") \ 1537 \ 1538 product(bool, ParGCTrimOverflow, true, \ 1539 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1540 \ 1541 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1542 "Whether we should simulate work queue overflow in ParNew") \ 1543 \ 1544 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1545 "An `interval' counter that determines how frequently " \ 1546 "we simulate overflow; a smaller number increases frequency") \ 1547 \ 1548 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1549 "The desired number of objects to claim from the overflow list") \ 1550 \ 1551 diagnostic(intx, ParGCStridesPerThread, 2, \ 1552 "The number of strides per worker thread that we divide up the " \ 1553 "card table scanning work into") \ 1554 \ 1555 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1556 "The number of cards in each chunk of the parallel chunks used " \ 1557 "during card table scanning") \ 1558 \ 1559 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1560 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1561 "parallel GC.") \ 1562 \ 1563 product(uintx, OldPLABWeight, 50, \ 1564 "Percentage (0-100) used to weight the current sample when" \ 1565 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1566 \ 1567 product(bool, ResizeOldPLAB, true, \ 1568 "Dynamically resize (old gen) promotion labs") \ 1569 \ 1570 product(bool, PrintOldPLAB, false, \ 1571 "Print (old gen) promotion labs sizing decisions") \ 1572 \ 1573 product(uintx, CMSOldPLABMin, 16, \ 1574 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1575 \ 1576 product(uintx, CMSOldPLABMax, 1024, \ 1577 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1578 \ 1579 product(uintx, CMSOldPLABNumRefills, 4, \ 1580 "Nominal number of refills of CMS gen promotion lab cache" \ 1581 " per worker per block size") \ 1582 \ 1583 product(bool, CMSOldPLABResizeQuicker, false, \ 1584 "Whether to react on-the-fly during a scavenge to a sudden" \ 1585 " change in block demand rate") \ 1586 \ 1587 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1588 "The tolerance of the phase-change detector for on-the-fly" \ 1589 " PLAB resizing during a scavenge") \ 1590 \ 1591 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1592 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1593 " during a scavenge") \ 1594 \ 1595 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1596 "The clamping of the gain in the feedback loop for on-the-fly" \ 1597 " PLAB resizing during a scavenge") \ 1598 \ 1599 product(bool, AlwaysPreTouch, false, \ 1600 "It forces all freshly committed pages to be pre-touched.") \ 1601 \ 1602 product_pd(intx, CMSYoungGenPerWorker, \ 1603 "The maximum size of young gen chosen by default per GC worker " \ 1604 "thread available") \ 1605 \ 1606 product(bool, GCOverheadReporting, false, \ 1607 "Enables the GC overhead reporting facility") \ 1608 \ 1609 product(intx, GCOverheadReportingPeriodMS, 100, \ 1610 "Reporting period for conc GC overhead reporting, in ms ") \ 1611 \ 1612 product(bool, CMSIncrementalMode, false, \ 1613 "Whether CMS GC should operate in \"incremental\" mode") \ 1614 \ 1615 product(uintx, CMSIncrementalDutyCycle, 10, \ 1616 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1617 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1618 "value") \ 1619 \ 1620 product(bool, CMSIncrementalPacing, true, \ 1621 "Whether the CMS incremental mode duty cycle should be " \ 1622 "automatically adjusted") \ 1623 \ 1624 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1625 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1626 "enabled (a percentage, 0-100)") \ 1627 \ 1628 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1629 "Percentage (0-100) used to add conservatism when computing the " \ 1630 "duty cycle") \ 1631 \ 1632 product(uintx, CMSIncrementalOffset, 0, \ 1633 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1634 " is shifted to the right within the period between young GCs") \ 1635 \ 1636 product(uintx, CMSExpAvgFactor, 50, \ 1637 "Percentage (0-100) used to weight the current sample when" \ 1638 "computing exponential averages for CMS statistics.") \ 1639 \ 1640 product(uintx, CMS_FLSWeight, 75, \ 1641 "Percentage (0-100) used to weight the current sample when" \ 1642 "computing exponentially decating averages for CMS FLS statistics.") \ 1643 \ 1644 product(uintx, CMS_FLSPadding, 1, \ 1645 "The multiple of deviation from mean to use for buffering" \ 1646 "against volatility in free list demand.") \ 1647 \ 1648 product(uintx, FLSCoalescePolicy, 2, \ 1649 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1650 \ 1651 product(bool, FLSAlwaysCoalesceLarge, false, \ 1652 "CMS: Larger free blocks are always available for coalescing") \ 1653 \ 1654 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1655 "CMS: the smaller the percentage the greater the coalition force")\ 1656 \ 1657 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1658 "CMS: the factor by which to inflate estimated demand of small" \ 1659 " block sizes to prevent coalescing with an adjoining block") \ 1660 \ 1661 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1662 "CMS: the factor by which to inflate estimated demand of large" \ 1663 " block sizes to prevent coalescing with an adjoining block") \ 1664 \ 1665 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1666 "CMS: the factor by which to inflate estimated demand of small" \ 1667 " block sizes to prevent splitting to supply demand for smaller" \ 1668 " blocks") \ 1669 \ 1670 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1671 "CMS: the factor by which to inflate estimated demand of large" \ 1672 " block sizes to prevent splitting to supply demand for smaller" \ 1673 " blocks") \ 1674 \ 1675 product(bool, CMSExtrapolateSweep, false, \ 1676 "CMS: cushion for block demand during sweep") \ 1677 \ 1678 product(uintx, CMS_SweepWeight, 75, \ 1679 "Percentage (0-100) used to weight the current sample when " \ 1680 "computing exponentially decaying average for inter-sweep " \ 1681 "duration") \ 1682 \ 1683 product(uintx, CMS_SweepPadding, 1, \ 1684 "The multiple of deviation from mean to use for buffering " \ 1685 "against volatility in inter-sweep duration.") \ 1686 \ 1687 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1688 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1689 "duration exceeds this threhold in milliseconds") \ 1690 \ 1691 develop(bool, CMSTraceIncrementalMode, false, \ 1692 "Trace CMS incremental mode") \ 1693 \ 1694 develop(bool, CMSTraceIncrementalPacing, false, \ 1695 "Trace CMS incremental mode pacing computation") \ 1696 \ 1697 develop(bool, CMSTraceThreadState, false, \ 1698 "Trace the CMS thread state (enable the trace_state() method)") \ 1699 \ 1700 product(bool, CMSClassUnloadingEnabled, false, \ 1701 "Whether class unloading enabled when using CMS GC") \ 1702 \ 1703 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1704 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1705 " for which classes may not be unloaded") \ 1706 \ 1707 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1708 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1709 \ 1710 product(bool, UseCMSCompactAtFullCollection, true, \ 1711 "Use mark sweep compact at full collections") \ 1712 \ 1713 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1714 "Number of CMS full collection done before compaction if > 0") \ 1715 \ 1716 develop(intx, CMSDictionaryChoice, 0, \ 1717 "Use BinaryTreeDictionary as default in the CMS generation") \ 1718 \ 1719 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1720 "Replenish an indexed free list with this number of chunks") \ 1721 \ 1722 product(bool, CMSReplenishIntermediate, true, \ 1723 "Replenish all intermediate free-list caches") \ 1724 \ 1725 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1726 "When satisfying batched demand, split blocks from the " \ 1727 "IndexedFreeList whose size is a multiple of requested size") \ 1728 \ 1729 product(bool, CMSLoopWarn, false, \ 1730 "Warn in case of excessive CMS looping") \ 1731 \ 1732 develop(bool, CMSOverflowEarlyRestoration, false, \ 1733 "Whether preserved marks should be restored early") \ 1734 \ 1735 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1736 "Size of marking stack") \ 1737 \ 1738 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1739 "Max size of marking stack") \ 1740 \ 1741 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1742 "Whether we should simulate frequent marking stack / work queue" \ 1743 " overflow") \ 1744 \ 1745 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1746 "An `interval' counter that determines how frequently" \ 1747 " we simulate overflow; a smaller number increases frequency") \ 1748 \ 1749 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1750 "(Temporary, subject to experimentation)" \ 1751 "Maximum number of abortable preclean iterations, if > 0") \ 1752 \ 1753 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1754 "(Temporary, subject to experimentation)" \ 1755 "Maximum time in abortable preclean in ms") \ 1756 \ 1757 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1758 "(Temporary, subject to experimentation)" \ 1759 "Nominal minimum work per abortable preclean iteration") \ 1760 \ 1761 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1762 "(Temporary, subject to experimentation)" \ 1763 " Time that we sleep between iterations when not given" \ 1764 " enough work per iteration") \ 1765 \ 1766 product(uintx, CMSRescanMultiple, 32, \ 1767 "Size (in cards) of CMS parallel rescan task") \ 1768 \ 1769 product(uintx, CMSConcMarkMultiple, 32, \ 1770 "Size (in cards) of CMS concurrent MT marking task") \ 1771 \ 1772 product(uintx, CMSRevisitStackSize, 1*M, \ 1773 "Size of CMS KlassKlass revisit stack") \ 1774 \ 1775 product(bool, CMSAbortSemantics, false, \ 1776 "Whether abort-on-overflow semantics is implemented") \ 1777 \ 1778 product(bool, CMSParallelRemarkEnabled, true, \ 1779 "Whether parallel remark enabled (only if ParNewGC)") \ 1780 \ 1781 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1782 "Whether parallel remark of survivor space" \ 1783 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1784 \ 1785 product(bool, CMSPLABRecordAlways, true, \ 1786 "Whether to always record survivor space PLAB bdries" \ 1787 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1788 \ 1789 product(bool, CMSConcurrentMTEnabled, true, \ 1790 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1791 \ 1792 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1793 "Whether concurrent precleaning enabled in perm gen" \ 1794 " (effective only when CMSPrecleaningEnabled is true)") \ 1795 \ 1796 product(bool, CMSPrecleaningEnabled, true, \ 1797 "Whether concurrent precleaning enabled") \ 1798 \ 1799 product(uintx, CMSPrecleanIter, 3, \ 1800 "Maximum number of precleaning iteration passes") \ 1801 \ 1802 product(uintx, CMSPrecleanNumerator, 2, \ 1803 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1804 " ratio") \ 1805 \ 1806 product(uintx, CMSPrecleanDenominator, 3, \ 1807 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1808 " ratio") \ 1809 \ 1810 product(bool, CMSPrecleanRefLists1, true, \ 1811 "Preclean ref lists during (initial) preclean phase") \ 1812 \ 1813 product(bool, CMSPrecleanRefLists2, false, \ 1814 "Preclean ref lists during abortable preclean phase") \ 1815 \ 1816 product(bool, CMSPrecleanSurvivors1, false, \ 1817 "Preclean survivors during (initial) preclean phase") \ 1818 \ 1819 product(bool, CMSPrecleanSurvivors2, true, \ 1820 "Preclean survivors during abortable preclean phase") \ 1821 \ 1822 product(uintx, CMSPrecleanThreshold, 1000, \ 1823 "Don't re-iterate if #dirty cards less than this") \ 1824 \ 1825 product(bool, CMSCleanOnEnter, true, \ 1826 "Clean-on-enter optimization for reducing number of dirty cards") \ 1827 \ 1828 product(uintx, CMSRemarkVerifyVariant, 1, \ 1829 "Choose variant (1,2) of verification following remark") \ 1830 \ 1831 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1832 "If Eden used is below this value, don't try to schedule remark") \ 1833 \ 1834 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1835 "The Eden occupancy % at which to try and schedule remark pause") \ 1836 \ 1837 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1838 "Start sampling Eden top at least before yg occupancy reaches" \ 1839 " 1/<ratio> of the size at which we plan to schedule remark") \ 1840 \ 1841 product(uintx, CMSSamplingGrain, 16*K, \ 1842 "The minimum distance between eden samples for CMS (see above)") \ 1843 \ 1844 product(bool, CMSScavengeBeforeRemark, false, \ 1845 "Attempt scavenge before the CMS remark step") \ 1846 \ 1847 develop(bool, CMSTraceSweeper, false, \ 1848 "Trace some actions of the CMS sweeper") \ 1849 \ 1850 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1851 "Don't drain below this size per parallel worker/thief") \ 1852 \ 1853 manageable(intx, CMSWaitDuration, 2000, \ 1854 "Time in milliseconds that CMS thread waits for young GC") \ 1855 \ 1856 product(bool, CMSYield, true, \ 1857 "Yield between steps of concurrent mark & sweep") \ 1858 \ 1859 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1860 "Bitmap operations should process at most this many bits" \ 1861 "between yields") \ 1862 \ 1863 product(bool, CMSDumpAtPromotionFailure, false, \ 1864 "Dump useful information about the state of the CMS old " \ 1865 " generation upon a promotion failure.") \ 1866 \ 1867 product(bool, CMSPrintChunksInDump, false, \ 1868 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1869 " more detailed information about the free chunks.") \ 1870 \ 1871 product(bool, CMSPrintObjectsInDump, false, \ 1872 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1873 " more detailed information about the allocated objects.") \ 1874 \ 1875 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1876 "Verify that all refs across the FLS boundary " \ 1877 " are to valid objects") \ 1878 \ 1879 diagnostic(bool, FLSVerifyLists, false, \ 1880 "Do lots of (expensive) FreeListSpace verification") \ 1881 \ 1882 diagnostic(bool, FLSVerifyIndexTable, false, \ 1883 "Do lots of (expensive) FLS index table verification") \ 1884 \ 1885 develop(bool, FLSVerifyDictionary, false, \ 1886 "Do lots of (expensive) FLS dictionary verification") \ 1887 \ 1888 develop(bool, VerifyBlockOffsetArray, false, \ 1889 "Do (expensive!) block offset array verification") \ 1890 \ 1891 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1892 "Maintain _unallocated_block in BlockOffsetArray" \ 1893 " (currently applicable only to CMS collector)") \ 1894 \ 1895 develop(bool, TraceCMSState, false, \ 1896 "Trace the state of the CMS collection") \ 1897 \ 1898 product(intx, RefDiscoveryPolicy, 0, \ 1899 "Whether reference-based(0) or referent-based(1)") \ 1900 \ 1901 product(bool, ParallelRefProcEnabled, false, \ 1902 "Enable parallel reference processing whenever possible") \ 1903 \ 1904 product(bool, ParallelRefProcBalancingEnabled, true, \ 1905 "Enable balancing of reference processing queues") \ 1906 \ 1907 product(intx, CMSTriggerRatio, 80, \ 1908 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1909 "allocated before a CMS collection cycle commences") \ 1910 \ 1911 product(intx, CMSTriggerPermRatio, 80, \ 1912 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1913 "is allocated before a CMS collection cycle commences, that " \ 1914 "also collects the perm generation") \ 1915 \ 1916 product(uintx, CMSBootstrapOccupancy, 50, \ 1917 "Percentage CMS generation occupancy at which to " \ 1918 "initiate CMS collection for bootstrapping collection stats") \ 1919 \ 1920 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1921 "Percentage CMS generation occupancy to start a CMS collection " \ 1922 "cycle. A negative value means that CMSTriggerRatio is used") \ 1923 \ 1924 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1925 "Percentage of the (entire) heap occupancy to start a " \ 1926 "concurrent GC cycle. It us used by GCs that trigger a " \ 1927 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1928 "not just one of the generations (e.g., G1). A value of 0 " \ 1929 "denotes 'do constant GC cycles'.") \ 1930 \ 1931 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1932 "Percentage CMS perm generation occupancy to start a " \ 1933 "CMScollection cycle. A negative value means that " \ 1934 "CMSTriggerPermRatio is used") \ 1935 \ 1936 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1937 "Only use occupancy as a crierion for starting a CMS collection") \ 1938 \ 1939 product(intx, CMSIsTooFullPercentage, 98, \ 1940 "An absolute ceiling above which CMS will always consider the " \ 1941 "perm gen ripe for collection") \ 1942 \ 1943 develop(bool, CMSTestInFreeList, false, \ 1944 "Check if the coalesced range is already in the " \ 1945 "free lists as claimed") \ 1946 \ 1947 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1948 "Check that all the garbage collected was returned to the " \ 1949 "free lists.") \ 1950 \ 1951 notproduct(bool, ScavengeALot, false, \ 1952 "Force scavenge at every Nth exit from the runtime system " \ 1953 "(N=ScavengeALotInterval)") \ 1954 \ 1955 develop(bool, FullGCALot, false, \ 1956 "Force full gc at every Nth exit from the runtime system " \ 1957 "(N=FullGCALotInterval)") \ 1958 \ 1959 notproduct(bool, GCALotAtAllSafepoints, false, \ 1960 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1961 \ 1962 product(bool, PrintPromotionFailure, false, \ 1963 "Print additional diagnostic information following " \ 1964 " promotion failure") \ 1965 \ 1966 notproduct(bool, PromotionFailureALot, false, \ 1967 "Use promotion failure handling on every youngest generation " \ 1968 "collection") \ 1969 \ 1970 develop(uintx, PromotionFailureALotCount, 1000, \ 1971 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1972 "refill attempts (ParNew) or promotion attempts " \ 1973 "(other young collectors) ") \ 1974 \ 1975 develop(uintx, PromotionFailureALotInterval, 5, \ 1976 "Total collections between promotion failures alot") \ 1977 \ 1978 experimental(intx, WorkStealingSleepMillis, 1, \ 1979 "Sleep time when sleep is used for yields") \ 1980 \ 1981 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1982 "Number of yields before a sleep is done during workstealing") \ 1983 \ 1984 experimental(uintx, WorkStealingHardSpins, 4096, \ 1985 "Number of iterations in a spin loop between checks on " \ 1986 "time out of hard spin") \ 1987 \ 1988 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1989 "Ratio of hard spins to calls to yield") \ 1990 \ 1991 product(uintx, PreserveMarkStackSize, 1024, \ 1992 "Size for stack used in promotion failure handling") \ 1993 \ 1994 develop(uintx, ObjArrayMarkingStride, 512, \ 1995 "Number of ObjArray elements to push onto the marking stack" \ 1996 "before pushing a continuation entry") \ 1997 \ 1998 notproduct(bool, ExecuteInternalVMTests, false, \ 1999 "Enable execution of internal VM tests.") \ 2000 \ 2001 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2002 \ 2003 product_pd(bool, ResizeTLAB, \ 2004 "Dynamically resize tlab size for threads") \ 2005 \ 2006 product(bool, ZeroTLAB, false, \ 2007 "Zero out the newly created TLAB") \ 2008 \ 2009 product(bool, FastTLABRefill, true, \ 2010 "Use fast TLAB refill code") \ 2011 \ 2012 product(bool, PrintTLAB, false, \ 2013 "Print various TLAB related information") \ 2014 \ 2015 product(bool, TLABStats, true, \ 2016 "Print various TLAB related information") \ 2017 \ 2018 product(bool, UseBlockZeroing, false, \ 2019 "Use special cpu instructions for block zeroing") \ 2020 \ 2021 product(intx, BlockZeroingLowLimit, 2048, \ 2022 "Minimum size in bytes when block zeroing will be used") \ 2023 \ 2024 product(bool, UseBlockCopy, false, \ 2025 "Use special cpu instructions for block copy") \ 2026 \ 2027 product(intx, BlockCopyLowLimit, 2048, \ 2028 "Minimum size in bytes when block copy will be used") \ 2029 \ 2030 product(bool, PrintRevisitStats, false, \ 2031 "Print revisit (klass and MDO) stack related information") \ 2032 \ 2033 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2034 "Enable LowMemoryProtection")) \ 2035 \ 2036 product_pd(bool, NeverActAsServerClassMachine, \ 2037 "Never act like a server-class machine") \ 2038 \ 2039 product(bool, AlwaysActAsServerClassMachine, false, \ 2040 "Always act like a server-class machine") \ 2041 \ 2042 product_pd(uint64_t, MaxRAM, \ 2043 "Real memory size (in bytes) used to set maximum heap size") \ 2044 \ 2045 product(uintx, ErgoHeapSizeLimit, 0, \ 2046 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2047 "MaxRAM / MaxRAMFraction") \ 2048 \ 2049 product(uintx, MaxRAMFraction, 4, \ 2050 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2051 "size") \ 2052 \ 2053 product(uintx, DefaultMaxRAMFraction, 4, \ 2054 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2055 "size; deprecated: to be renamed to MaxRAMFraction") \ 2056 \ 2057 product(uintx, MinRAMFraction, 2, \ 2058 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2059 "size on systems with small physical memory size") \ 2060 \ 2061 product(uintx, InitialRAMFraction, 64, \ 2062 "Fraction (1/n) of real memory used for initial heap size") \ 2063 \ 2064 product(bool, UseAutoGCSelectPolicy, false, \ 2065 "Use automatic collection selection policy") \ 2066 \ 2067 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2068 "Automatic GC selection pause threshhold in ms") \ 2069 \ 2070 product(bool, UseAdaptiveSizePolicy, true, \ 2071 "Use adaptive generation sizing policies") \ 2072 \ 2073 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2074 "Use adaptive survivor sizing policies") \ 2075 \ 2076 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2077 "Use adaptive young-old sizing policies at minor collections") \ 2078 \ 2079 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2080 "Use adaptive young-old sizing policies at major collections") \ 2081 \ 2082 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2083 "Use statistics from System.GC for adaptive size policy") \ 2084 \ 2085 product(bool, UseAdaptiveGCBoundary, false, \ 2086 "Allow young-old boundary to move") \ 2087 \ 2088 develop(bool, TraceAdaptiveGCBoundary, false, \ 2089 "Trace young-old boundary moves") \ 2090 \ 2091 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2092 "Resize the virtual spaces of the young or old generations") \ 2093 \ 2094 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2095 "Policy for changeing generation size for throughput goals") \ 2096 \ 2097 product(uintx, AdaptiveSizePausePolicy, 0, \ 2098 "Policy for changing generation size for pause goals") \ 2099 \ 2100 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2101 "Adjust tenured generation to achive a minor pause goal") \ 2102 \ 2103 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2104 "Adjust young generation to achive a major pause goal") \ 2105 \ 2106 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2107 "Number of steps where heuristics is used before data is used") \ 2108 \ 2109 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2110 "Number of collections before the adaptive sizing is started") \ 2111 \ 2112 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2113 "Collecton interval for printing information; zero => never") \ 2114 \ 2115 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2116 "Use adaptive minimum footprint as a goal") \ 2117 \ 2118 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2119 "Weight given to exponential resizing, between 0 and 100") \ 2120 \ 2121 product(uintx, AdaptiveTimeWeight, 25, \ 2122 "Weight given to time in adaptive policy, between 0 and 100") \ 2123 \ 2124 product(uintx, PausePadding, 1, \ 2125 "How much buffer to keep for pause time") \ 2126 \ 2127 product(uintx, PromotedPadding, 3, \ 2128 "How much buffer to keep for promotion failure") \ 2129 \ 2130 product(uintx, SurvivorPadding, 3, \ 2131 "How much buffer to keep for survivor overflow") \ 2132 \ 2133 product(uintx, AdaptivePermSizeWeight, 20, \ 2134 "Weight for perm gen exponential resizing, between 0 and 100") \ 2135 \ 2136 product(uintx, PermGenPadding, 3, \ 2137 "How much buffer to keep for perm gen sizing") \ 2138 \ 2139 product(uintx, ThresholdTolerance, 10, \ 2140 "Allowed collection cost difference between generations") \ 2141 \ 2142 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2143 "If collection costs are within margin, reduce both by full " \ 2144 "delta") \ 2145 \ 2146 product(uintx, YoungGenerationSizeIncrement, 20, \ 2147 "Adaptive size percentage change in young generation") \ 2148 \ 2149 product(uintx, YoungGenerationSizeSupplement, 80, \ 2150 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2151 \ 2152 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2153 "Decay factor to YoungedGenerationSizeSupplement") \ 2154 \ 2155 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2156 "Adaptive size percentage change in tenured generation") \ 2157 \ 2158 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2159 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2160 \ 2161 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2162 "Decay factor to TenuredGenerationSizeIncrement") \ 2163 \ 2164 product(uintx, MaxGCPauseMillis, max_uintx, \ 2165 "Adaptive size policy maximum GC pause time goal in msec, " \ 2166 "or (G1 Only) the max. GC time per MMU time slice") \ 2167 \ 2168 product(uintx, GCPauseIntervalMillis, 0, \ 2169 "Time slice for MMU specification") \ 2170 \ 2171 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2172 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2173 \ 2174 product(uintx, GCTimeRatio, 99, \ 2175 "Adaptive size policy application time to GC time ratio") \ 2176 \ 2177 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2178 "Adaptive size scale down factor for shrinking") \ 2179 \ 2180 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2181 "Adaptive size decays the major cost for long major intervals") \ 2182 \ 2183 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2184 "Time scale over which major costs decay") \ 2185 \ 2186 product(uintx, MinSurvivorRatio, 3, \ 2187 "Minimum ratio of young generation/survivor space size") \ 2188 \ 2189 product(uintx, InitialSurvivorRatio, 8, \ 2190 "Initial ratio of eden/survivor space size") \ 2191 \ 2192 product(uintx, BaseFootPrintEstimate, 256*M, \ 2193 "Estimate of footprint other than Java Heap") \ 2194 \ 2195 product(bool, UseGCOverheadLimit, true, \ 2196 "Use policy to limit of proportion of time spent in GC " \ 2197 "before an OutOfMemory error is thrown") \ 2198 \ 2199 product(uintx, GCTimeLimit, 98, \ 2200 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2201 "error is thrown (used with GCHeapFreeLimit)") \ 2202 \ 2203 product(uintx, GCHeapFreeLimit, 2, \ 2204 "Minimum percentage of free space after a full GC before an " \ 2205 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2206 \ 2207 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2208 "Number of consecutive collections before gc time limit fires") \ 2209 \ 2210 product(bool, PrintAdaptiveSizePolicy, false, \ 2211 "Print information about AdaptiveSizePolicy") \ 2212 \ 2213 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2214 "How far ahead to prefetch destination area (<= 0 means off)") \ 2215 \ 2216 product(intx, PrefetchScanIntervalInBytes, -1, \ 2217 "How far ahead to prefetch scan area (<= 0 means off)") \ 2218 \ 2219 product(intx, PrefetchFieldsAhead, -1, \ 2220 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2221 \ 2222 develop(bool, UsePrefetchQueue, true, \ 2223 "Use the prefetch queue during PS promotion") \ 2224 \ 2225 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2226 "Verify system before exiting") \ 2227 \ 2228 diagnostic(bool, VerifyBeforeGC, false, \ 2229 "Verify memory system before GC") \ 2230 \ 2231 diagnostic(bool, VerifyAfterGC, false, \ 2232 "Verify memory system after GC") \ 2233 \ 2234 diagnostic(bool, VerifyDuringGC, false, \ 2235 "Verify memory system during GC (between phases)") \ 2236 \ 2237 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2238 "Enable parallel memory system verification") \ 2239 \ 2240 diagnostic(bool, DeferInitialCardMark, false, \ 2241 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2242 "may arise from new_pre_store_barrier") \ 2243 \ 2244 diagnostic(bool, VerifyRememberedSets, false, \ 2245 "Verify GC remembered sets") \ 2246 \ 2247 diagnostic(bool, VerifyObjectStartArray, true, \ 2248 "Verify GC object start array if verify before/after") \ 2249 \ 2250 product(bool, DisableExplicitGC, false, \ 2251 "Tells whether calling System.gc() does a full GC") \ 2252 \ 2253 notproduct(bool, CheckMemoryInitialization, false, \ 2254 "Checks memory initialization") \ 2255 \ 2256 product(bool, CollectGen0First, false, \ 2257 "Collect youngest generation before each full GC") \ 2258 \ 2259 diagnostic(bool, BindCMSThreadToCPU, false, \ 2260 "Bind CMS Thread to CPU if possible") \ 2261 \ 2262 diagnostic(uintx, CPUForCMSThread, 0, \ 2263 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2264 \ 2265 product(bool, BindGCTaskThreadsToCPUs, false, \ 2266 "Bind GCTaskThreads to CPUs if possible") \ 2267 \ 2268 product(bool, UseGCTaskAffinity, false, \ 2269 "Use worker affinity when asking for GCTasks") \ 2270 \ 2271 product(uintx, ProcessDistributionStride, 4, \ 2272 "Stride through processors when distributing processes") \ 2273 \ 2274 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2275 "number of times the coordinator GC thread will sleep while " \ 2276 "yielding before giving up and resuming GC") \ 2277 \ 2278 product(uintx, CMSYieldSleepCount, 0, \ 2279 "number of times a GC thread (minus the coordinator) " \ 2280 "will sleep while yielding before giving up and resuming GC") \ 2281 \ 2282 /* gc tracing */ \ 2283 manageable(bool, PrintGC, false, \ 2284 "Print message at garbage collect") \ 2285 \ 2286 manageable(bool, PrintGCDetails, false, \ 2287 "Print more details at garbage collect") \ 2288 \ 2289 manageable(bool, PrintGCDateStamps, false, \ 2290 "Print date stamps at garbage collect") \ 2291 \ 2292 manageable(bool, PrintGCTimeStamps, false, \ 2293 "Print timestamps at garbage collect") \ 2294 \ 2295 product(bool, PrintGCTaskTimeStamps, false, \ 2296 "Print timestamps for individual gc worker thread tasks") \ 2297 \ 2298 develop(intx, ConcGCYieldTimeout, 0, \ 2299 "If non-zero, assert that GC threads yield within this # of ms.") \ 2300 \ 2301 notproduct(bool, TraceMarkSweep, false, \ 2302 "Trace mark sweep") \ 2303 \ 2304 product(bool, PrintReferenceGC, false, \ 2305 "Print times spent handling reference objects during GC " \ 2306 " (enabled only when PrintGCDetails)") \ 2307 \ 2308 develop(bool, TraceReferenceGC, false, \ 2309 "Trace handling of soft/weak/final/phantom references") \ 2310 \ 2311 develop(bool, TraceFinalizerRegistration, false, \ 2312 "Trace registration of final references") \ 2313 \ 2314 notproduct(bool, TraceScavenge, false, \ 2315 "Trace scavenge") \ 2316 \ 2317 product_rw(bool, TraceClassLoading, false, \ 2318 "Trace all classes loaded") \ 2319 \ 2320 product(bool, TraceClassLoadingPreorder, false, \ 2321 "Trace all classes loaded in order referenced (not loaded)") \ 2322 \ 2323 product_rw(bool, TraceClassUnloading, false, \ 2324 "Trace unloading of classes") \ 2325 \ 2326 product_rw(bool, TraceLoaderConstraints, false, \ 2327 "Trace loader constraints") \ 2328 \ 2329 product(bool, TraceGen0Time, false, \ 2330 "Trace accumulated time for Gen 0 collection") \ 2331 \ 2332 product(bool, TraceGen1Time, false, \ 2333 "Trace accumulated time for Gen 1 collection") \ 2334 \ 2335 product(bool, PrintTenuringDistribution, false, \ 2336 "Print tenuring age information") \ 2337 \ 2338 product_rw(bool, PrintHeapAtGC, false, \ 2339 "Print heap layout before and after each GC") \ 2340 \ 2341 product_rw(bool, PrintHeapAtGCExtended, false, \ 2342 "Prints extended information about the layout of the heap " \ 2343 "when -XX:+PrintHeapAtGC is set") \ 2344 \ 2345 product(bool, PrintHeapAtSIGBREAK, true, \ 2346 "Print heap layout in response to SIGBREAK") \ 2347 \ 2348 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2349 "Print a class histogram before any major stop-world GC") \ 2350 \ 2351 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2352 "Print a class histogram after any major stop-world GC") \ 2353 \ 2354 manageable(bool, PrintClassHistogram, false, \ 2355 "Print a histogram of class instances") \ 2356 \ 2357 develop(bool, TraceWorkGang, false, \ 2358 "Trace activities of work gangs") \ 2359 \ 2360 product(bool, TraceParallelOldGCTasks, false, \ 2361 "Trace multithreaded GC activity") \ 2362 \ 2363 develop(bool, TraceBlockOffsetTable, false, \ 2364 "Print BlockOffsetTable maps") \ 2365 \ 2366 develop(bool, TraceCardTableModRefBS, false, \ 2367 "Print CardTableModRefBS maps") \ 2368 \ 2369 develop(bool, TraceGCTaskManager, false, \ 2370 "Trace actions of the GC task manager") \ 2371 \ 2372 develop(bool, TraceGCTaskQueue, false, \ 2373 "Trace actions of the GC task queues") \ 2374 \ 2375 diagnostic(bool, TraceGCTaskThread, false, \ 2376 "Trace actions of the GC task threads") \ 2377 \ 2378 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2379 "Print the time taken by each parallel old gc phase." \ 2380 "PrintGCDetails must also be enabled.") \ 2381 \ 2382 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2383 "Trace parallel old gc marking phase") \ 2384 \ 2385 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2386 "Trace parallel old gc summary phase") \ 2387 \ 2388 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2389 "Trace parallel old gc compaction phase") \ 2390 \ 2391 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2392 "Trace parallel old gc dense prefix computation") \ 2393 \ 2394 develop(bool, IgnoreLibthreadGPFault, false, \ 2395 "Suppress workaround for libthread GP fault") \ 2396 \ 2397 product(bool, PrintJNIGCStalls, false, \ 2398 "Print diagnostic message when GC is stalled" \ 2399 "by JNI critical section") \ 2400 \ 2401 /* GC log rotation setting */ \ 2402 \ 2403 product(bool, UseGCLogFileRotation, false, \ 2404 "Prevent large gclog file for long running app. " \ 2405 "Requires -Xloggc:<filename>") \ 2406 \ 2407 product(uintx, NumberOfGCLogFiles, 0, \ 2408 "Number of gclog files in rotation, " \ 2409 "Default: 0, no rotation") \ 2410 \ 2411 product(uintx, GCLogFileSize, 0, \ 2412 "GC log file size, Default: 0 bytes, no rotation " \ 2413 "Only valid with UseGCLogFileRotation") \ 2414 \ 2415 /* JVMTI heap profiling */ \ 2416 \ 2417 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2418 "Trace JVMTI object tagging calls") \ 2419 \ 2420 diagnostic(bool, VerifyBeforeIteration, false, \ 2421 "Verify memory system before JVMTI iteration") \ 2422 \ 2423 /* compiler interface */ \ 2424 \ 2425 develop(bool, CIPrintCompilerName, false, \ 2426 "when CIPrint is active, print the name of the active compiler") \ 2427 \ 2428 develop(bool, CIPrintCompileQueue, false, \ 2429 "display the contents of the compile queue whenever a " \ 2430 "compilation is enqueued") \ 2431 \ 2432 develop(bool, CIPrintRequests, false, \ 2433 "display every request for compilation") \ 2434 \ 2435 product(bool, CITime, false, \ 2436 "collect timing information for compilation") \ 2437 \ 2438 develop(bool, CITimeEach, false, \ 2439 "display timing information after each successful compilation") \ 2440 \ 2441 develop(bool, CICountOSR, true, \ 2442 "use a separate counter when assigning ids to osr compilations") \ 2443 \ 2444 develop(bool, CICompileNatives, true, \ 2445 "compile native methods if supported by the compiler") \ 2446 \ 2447 develop_pd(bool, CICompileOSR, \ 2448 "compile on stack replacement methods if supported by the " \ 2449 "compiler") \ 2450 \ 2451 develop(bool, CIPrintMethodCodes, false, \ 2452 "print method bytecodes of the compiled code") \ 2453 \ 2454 develop(bool, CIPrintTypeFlow, false, \ 2455 "print the results of ciTypeFlow analysis") \ 2456 \ 2457 develop(bool, CITraceTypeFlow, false, \ 2458 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2459 \ 2460 develop(intx, CICloneLoopTestLimit, 100, \ 2461 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2462 \ 2463 develop(intx, OSROnlyBCI, -1, \ 2464 "OSR only at this bci. Negative values mean exclude that bci") \ 2465 \ 2466 /* temp diagnostics */ \ 2467 \ 2468 diagnostic(bool, TraceRedundantCompiles, false, \ 2469 "Have compile broker print when a request already in the queue is"\ 2470 " requested again") \ 2471 \ 2472 diagnostic(bool, InitialCompileFast, false, \ 2473 "Initial compile at CompLevel_fast_compile") \ 2474 \ 2475 diagnostic(bool, InitialCompileReallyFast, false, \ 2476 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2477 \ 2478 diagnostic(bool, FullProfileOnReInterpret, true, \ 2479 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2480 \ 2481 /* compiler */ \ 2482 \ 2483 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2484 "Number of compiler threads to run") \ 2485 \ 2486 product(intx, CompilationPolicyChoice, 0, \ 2487 "which compilation policy (0/1)") \ 2488 \ 2489 develop(bool, UseStackBanging, true, \ 2490 "use stack banging for stack overflow checks (required for " \ 2491 "proper StackOverflow handling; disable only to measure cost " \ 2492 "of stackbanging)") \ 2493 \ 2494 develop(bool, Use24BitFPMode, true, \ 2495 "Set 24-bit FPU mode on a per-compile basis ") \ 2496 \ 2497 develop(bool, Use24BitFP, true, \ 2498 "use FP instructions that produce 24-bit precise results") \ 2499 \ 2500 develop(bool, UseStrictFP, true, \ 2501 "use strict fp if modifier strictfp is set") \ 2502 \ 2503 develop(bool, GenerateSynchronizationCode, true, \ 2504 "generate locking/unlocking code for synchronized methods and " \ 2505 "monitors") \ 2506 \ 2507 develop(bool, GenerateCompilerNullChecks, true, \ 2508 "Generate explicit null checks for loads/stores/calls") \ 2509 \ 2510 develop(bool, GenerateRangeChecks, true, \ 2511 "Generate range checks for array accesses") \ 2512 \ 2513 develop_pd(bool, ImplicitNullChecks, \ 2514 "generate code for implicit null checks") \ 2515 \ 2516 product(bool, PrintSafepointStatistics, false, \ 2517 "print statistics about safepoint synchronization") \ 2518 \ 2519 product(intx, PrintSafepointStatisticsCount, 300, \ 2520 "total number of safepoint statistics collected " \ 2521 "before printing them out") \ 2522 \ 2523 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2524 "print safepoint statistics only when safepoint takes" \ 2525 " more than PrintSafepointSatisticsTimeout in millis") \ 2526 \ 2527 product(bool, TraceSafepointCleanupTime, false, \ 2528 "print the break down of clean up tasks performed during" \ 2529 " safepoint") \ 2530 \ 2531 develop(bool, InlineAccessors, true, \ 2532 "inline accessor methods (get/set)") \ 2533 \ 2534 product(bool, Inline, true, \ 2535 "enable inlining") \ 2536 \ 2537 product(bool, ClipInlining, true, \ 2538 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2539 \ 2540 develop(bool, UseCHA, true, \ 2541 "enable CHA") \ 2542 \ 2543 product(bool, UseTypeProfile, true, \ 2544 "Check interpreter profile for historically monomorphic calls") \ 2545 \ 2546 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2547 "% of major receiver type to all profiled receivers") \ 2548 \ 2549 notproduct(bool, TimeCompiler, false, \ 2550 "time the compiler") \ 2551 \ 2552 notproduct(bool, TimeCompiler2, false, \ 2553 "detailed time the compiler (requires +TimeCompiler)") \ 2554 \ 2555 diagnostic(bool, PrintInlining, false, \ 2556 "prints inlining optimizations") \ 2557 \ 2558 diagnostic(bool, PrintIntrinsics, false, \ 2559 "prints attempted and successful inlining of intrinsics") \ 2560 \ 2561 product(bool, UseCountLeadingZerosInstruction, false, \ 2562 "Use count leading zeros instruction") \ 2563 \ 2564 product(bool, UsePopCountInstruction, false, \ 2565 "Use population count instruction") \ 2566 \ 2567 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2568 "do not expand intrinsics whose (internal) names appear here") \ 2569 \ 2570 develop(bool, StressReflectiveCode, false, \ 2571 "Use inexact types at allocations, etc., to test reflection") \ 2572 \ 2573 develop(bool, EagerInitialization, false, \ 2574 "Eagerly initialize classes if possible") \ 2575 \ 2576 develop(bool, TraceMethodReplacement, false, \ 2577 "Print when methods are replaced do to recompilation") \ 2578 \ 2579 develop(bool, PrintMethodFlushing, false, \ 2580 "print the nmethods being flushed") \ 2581 \ 2582 notproduct(bool, LogMultipleMutexLocking, false, \ 2583 "log locking and unlocking of mutexes (only if multiple locks " \ 2584 "are held)") \ 2585 \ 2586 develop(bool, UseRelocIndex, false, \ 2587 "use an index to speed random access to relocations") \ 2588 \ 2589 develop(bool, StressCodeBuffers, false, \ 2590 "Exercise code buffer expansion and other rare state changes") \ 2591 \ 2592 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2593 "Generate extra debugging info for non-safepoints in nmethods") \ 2594 \ 2595 diagnostic(bool, DebugInlinedCalls, true, \ 2596 "If false, restricts profiled locations to the root method only") \ 2597 \ 2598 product(bool, PrintVMOptions, false, \ 2599 "Print flags that appeared on the command line") \ 2600 \ 2601 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2602 "Ignore unrecognized VM options") \ 2603 \ 2604 product(bool, PrintCommandLineFlags, false, \ 2605 "Print flags specified on command line or set by ergonomics") \ 2606 \ 2607 product(bool, PrintFlagsInitial, false, \ 2608 "Print all VM flags before argument processing and exit VM") \ 2609 \ 2610 product(bool, PrintFlagsFinal, false, \ 2611 "Print all VM flags after argument and ergonomic processing") \ 2612 \ 2613 notproduct(bool, PrintFlagsWithComments, false, \ 2614 "Print all VM flags with default values and descriptions and exit")\ 2615 \ 2616 diagnostic(bool, SerializeVMOutput, true, \ 2617 "Use a mutex to serialize output to tty and hotspot.log") \ 2618 \ 2619 diagnostic(bool, DisplayVMOutput, true, \ 2620 "Display all VM output on the tty, independently of LogVMOutput") \ 2621 \ 2622 diagnostic(bool, LogVMOutput, trueInDebug, \ 2623 "Save VM output to hotspot.log, or to LogFile") \ 2624 \ 2625 diagnostic(ccstr, LogFile, NULL, \ 2626 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2627 \ 2628 product(ccstr, ErrorFile, NULL, \ 2629 "If an error occurs, save the error data to this file " \ 2630 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2631 \ 2632 product(bool, DisplayVMOutputToStderr, false, \ 2633 "If DisplayVMOutput is true, display all VM output to stderr") \ 2634 \ 2635 product(bool, DisplayVMOutputToStdout, false, \ 2636 "If DisplayVMOutput is true, display all VM output to stdout") \ 2637 \ 2638 product(bool, UseHeavyMonitors, false, \ 2639 "use heavyweight instead of lightweight Java monitors") \ 2640 \ 2641 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2642 "print histogram of the symbol table") \ 2643 \ 2644 notproduct(bool, ExitVMOnVerifyError, false, \ 2645 "standard exit from VM if bytecode verify error " \ 2646 "(only in debug mode)") \ 2647 \ 2648 notproduct(ccstr, AbortVMOnException, NULL, \ 2649 "Call fatal if this exception is thrown. Example: " \ 2650 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2651 \ 2652 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2653 "Call fatal if the exception pointed by AbortVMOnException " \ 2654 "has this message.") \ 2655 \ 2656 develop(bool, DebugVtables, false, \ 2657 "add debugging code to vtable dispatch") \ 2658 \ 2659 develop(bool, PrintVtables, false, \ 2660 "print vtables when printing klass") \ 2661 \ 2662 notproduct(bool, PrintVtableStats, false, \ 2663 "print vtables stats at end of run") \ 2664 \ 2665 develop(bool, TraceCreateZombies, false, \ 2666 "trace creation of zombie nmethods") \ 2667 \ 2668 notproduct(bool, IgnoreLockingAssertions, false, \ 2669 "disable locking assertions (for speed)") \ 2670 \ 2671 notproduct(bool, VerifyLoopOptimizations, false, \ 2672 "verify major loop optimizations") \ 2673 \ 2674 product(bool, RangeCheckElimination, true, \ 2675 "Split loop iterations to eliminate range checks") \ 2676 \ 2677 develop_pd(bool, UncommonNullCast, \ 2678 "track occurrences of null in casts; adjust compiler tactics") \ 2679 \ 2680 develop(bool, TypeProfileCasts, true, \ 2681 "treat casts like calls for purposes of type profiling") \ 2682 \ 2683 develop(bool, MonomorphicArrayCheck, true, \ 2684 "Uncommon-trap array store checks that require full type check") \ 2685 \ 2686 diagnostic(bool, ProfileDynamicTypes, true, \ 2687 "do extra type profiling and use it more aggressively") \ 2688 \ 2689 develop(bool, DelayCompilationDuringStartup, true, \ 2690 "Delay invoking the compiler until main application class is " \ 2691 "loaded") \ 2692 \ 2693 develop(bool, CompileTheWorld, false, \ 2694 "Compile all methods in all classes in bootstrap class path " \ 2695 "(stress test)") \ 2696 \ 2697 develop(bool, CompileTheWorldPreloadClasses, true, \ 2698 "Preload all classes used by a class before start loading") \ 2699 \ 2700 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2701 "Force a safepoint every n compiles so sweeper can keep up") \ 2702 \ 2703 develop(bool, TraceIterativeGVN, false, \ 2704 "Print progress during Iterative Global Value Numbering") \ 2705 \ 2706 develop(bool, FillDelaySlots, true, \ 2707 "Fill delay slots (on SPARC only)") \ 2708 \ 2709 develop(bool, VerifyIterativeGVN, false, \ 2710 "Verify Def-Use modifications during sparse Iterative Global " \ 2711 "Value Numbering") \ 2712 \ 2713 notproduct(bool, TracePhaseCCP, false, \ 2714 "Print progress during Conditional Constant Propagation") \ 2715 \ 2716 develop(bool, TimeLivenessAnalysis, false, \ 2717 "Time computation of bytecode liveness analysis") \ 2718 \ 2719 develop(bool, TraceLivenessGen, false, \ 2720 "Trace the generation of liveness analysis information") \ 2721 \ 2722 notproduct(bool, TraceLivenessQuery, false, \ 2723 "Trace queries of liveness analysis information") \ 2724 \ 2725 notproduct(bool, CollectIndexSetStatistics, false, \ 2726 "Collect information about IndexSets") \ 2727 \ 2728 develop(bool, PrintDominators, false, \ 2729 "Print out dominator trees for GVN") \ 2730 \ 2731 develop(bool, UseLoopSafepoints, true, \ 2732 "Generate Safepoint nodes in every loop") \ 2733 \ 2734 notproduct(bool, TraceCISCSpill, false, \ 2735 "Trace allocators use of cisc spillable instructions") \ 2736 \ 2737 notproduct(bool, TraceSpilling, false, \ 2738 "Trace spilling") \ 2739 \ 2740 product(bool, SplitIfBlocks, true, \ 2741 "Clone compares and control flow through merge points to fold " \ 2742 "some branches") \ 2743 \ 2744 develop(intx, FastAllocateSizeLimit, 128*K, \ 2745 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2746 "Inline allocations larger than this in doublewords must go slow")\ 2747 \ 2748 product(bool, AggressiveOpts, false, \ 2749 "Enable aggressive optimizations - see arguments.cpp") \ 2750 \ 2751 product(bool, UseStringCache, false, \ 2752 "Enable String cache capabilities on String.java") \ 2753 \ 2754 /* statistics */ \ 2755 develop(bool, CountCompiledCalls, false, \ 2756 "counts method invocations") \ 2757 \ 2758 notproduct(bool, CountRuntimeCalls, false, \ 2759 "counts VM runtime calls") \ 2760 \ 2761 develop(bool, CountJNICalls, false, \ 2762 "counts jni method invocations") \ 2763 \ 2764 notproduct(bool, CountJVMCalls, false, \ 2765 "counts jvm method invocations") \ 2766 \ 2767 notproduct(bool, CountRemovableExceptions, false, \ 2768 "count exceptions that could be replaced by branches due to " \ 2769 "inlining") \ 2770 \ 2771 notproduct(bool, ICMissHistogram, false, \ 2772 "produce histogram of IC misses") \ 2773 \ 2774 notproduct(bool, PrintClassStatistics, false, \ 2775 "prints class statistics at end of run") \ 2776 \ 2777 notproduct(bool, PrintMethodStatistics, false, \ 2778 "prints method statistics at end of run") \ 2779 \ 2780 /* interpreter */ \ 2781 develop(bool, ClearInterpreterLocals, false, \ 2782 "Always clear local variables of interpreter activations upon " \ 2783 "entry") \ 2784 \ 2785 product_pd(bool, RewriteBytecodes, \ 2786 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2787 \ 2788 product_pd(bool, RewriteFrequentPairs, \ 2789 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2790 \ 2791 diagnostic(bool, PrintInterpreter, false, \ 2792 "Prints the generated interpreter code") \ 2793 \ 2794 product(bool, UseInterpreter, true, \ 2795 "Use interpreter for non-compiled methods") \ 2796 \ 2797 develop(bool, UseFastSignatureHandlers, true, \ 2798 "Use fast signature handlers for native calls") \ 2799 \ 2800 develop(bool, UseV8InstrsOnly, false, \ 2801 "Use SPARC-V8 Compliant instruction subset") \ 2802 \ 2803 product(bool, UseNiagaraInstrs, false, \ 2804 "Use Niagara-efficient instruction subset") \ 2805 \ 2806 develop(bool, UseCASForSwap, false, \ 2807 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2808 \ 2809 product(bool, UseLoopCounter, true, \ 2810 "Increment invocation counter on backward branch") \ 2811 \ 2812 product(bool, UseFastEmptyMethods, true, \ 2813 "Use fast method entry code for empty methods") \ 2814 \ 2815 product(bool, UseFastAccessorMethods, true, \ 2816 "Use fast method entry code for accessor methods") \ 2817 \ 2818 product_pd(bool, UseOnStackReplacement, \ 2819 "Use on stack replacement, calls runtime if invoc. counter " \ 2820 "overflows in loop") \ 2821 \ 2822 notproduct(bool, TraceOnStackReplacement, false, \ 2823 "Trace on stack replacement") \ 2824 \ 2825 develop(bool, PoisonOSREntry, true, \ 2826 "Detect abnormal calls to OSR code") \ 2827 \ 2828 product_pd(bool, PreferInterpreterNativeStubs, \ 2829 "Use always interpreter stubs for native methods invoked via " \ 2830 "interpreter") \ 2831 \ 2832 develop(bool, CountBytecodes, false, \ 2833 "Count number of bytecodes executed") \ 2834 \ 2835 develop(bool, PrintBytecodeHistogram, false, \ 2836 "Print histogram of the executed bytecodes") \ 2837 \ 2838 develop(bool, PrintBytecodePairHistogram, false, \ 2839 "Print histogram of the executed bytecode pairs") \ 2840 \ 2841 diagnostic(bool, PrintSignatureHandlers, false, \ 2842 "Print code generated for native method signature handlers") \ 2843 \ 2844 develop(bool, VerifyOops, false, \ 2845 "Do plausibility checks for oops") \ 2846 \ 2847 develop(bool, CheckUnhandledOops, false, \ 2848 "Check for unhandled oops in VM code") \ 2849 \ 2850 develop(bool, VerifyJNIFields, trueInDebug, \ 2851 "Verify jfieldIDs for instance fields") \ 2852 \ 2853 notproduct(bool, VerifyJNIEnvThread, false, \ 2854 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2855 "from JNI") \ 2856 \ 2857 develop(bool, VerifyFPU, false, \ 2858 "Verify FPU state (check for NaN's, etc.)") \ 2859 \ 2860 develop(bool, VerifyThread, false, \ 2861 "Watch the thread register for corruption (SPARC only)") \ 2862 \ 2863 develop(bool, VerifyActivationFrameSize, false, \ 2864 "Verify that activation frame didn't become smaller than its " \ 2865 "minimal size") \ 2866 \ 2867 develop(bool, TraceFrequencyInlining, false, \ 2868 "Trace frequency based inlining") \ 2869 \ 2870 notproduct(bool, TraceTypeProfile, false, \ 2871 "Trace type profile") \ 2872 \ 2873 develop_pd(bool, InlineIntrinsics, \ 2874 "Inline intrinsics that can be statically resolved") \ 2875 \ 2876 product_pd(bool, ProfileInterpreter, \ 2877 "Profile at the bytecode level during interpretation") \ 2878 \ 2879 develop_pd(bool, ProfileTraps, \ 2880 "Profile deoptimization traps at the bytecode level") \ 2881 \ 2882 product(intx, ProfileMaturityPercentage, 20, \ 2883 "number of method invocations/branches (expressed as % of " \ 2884 "CompileThreshold) before using the method's profile") \ 2885 \ 2886 develop(bool, PrintMethodData, false, \ 2887 "Print the results of +ProfileInterpreter at end of run") \ 2888 \ 2889 develop(bool, VerifyDataPointer, trueInDebug, \ 2890 "Verify the method data pointer during interpreter profiling") \ 2891 \ 2892 develop(bool, VerifyCompiledCode, false, \ 2893 "Include miscellaneous runtime verifications in nmethod code; " \ 2894 "default off because it disturbs nmethod size heuristics") \ 2895 \ 2896 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2897 "Manually make GC thread crash then dump java stack trace; " \ 2898 "Test only") \ 2899 \ 2900 /* compilation */ \ 2901 product(bool, UseCompiler, true, \ 2902 "use compilation") \ 2903 \ 2904 develop(bool, TraceCompilationPolicy, false, \ 2905 "Trace compilation policy") \ 2906 \ 2907 develop(bool, TimeCompilationPolicy, false, \ 2908 "Time the compilation policy") \ 2909 \ 2910 product(bool, UseCounterDecay, true, \ 2911 "adjust recompilation counters") \ 2912 \ 2913 develop(intx, CounterHalfLifeTime, 30, \ 2914 "half-life time of invocation counters (in secs)") \ 2915 \ 2916 develop(intx, CounterDecayMinIntervalLength, 500, \ 2917 "Min. ms. between invocation of CounterDecay") \ 2918 \ 2919 product(bool, AlwaysCompileLoopMethods, false, \ 2920 "when using recompilation, never interpret methods " \ 2921 "containing loops") \ 2922 \ 2923 product(bool, DontCompileHugeMethods, true, \ 2924 "don't compile methods > HugeMethodLimit") \ 2925 \ 2926 /* Bytecode escape analysis estimation. */ \ 2927 product(bool, EstimateArgEscape, true, \ 2928 "Analyze bytecodes to estimate escape state of arguments") \ 2929 \ 2930 product(intx, BCEATraceLevel, 0, \ 2931 "How much tracing to do of bytecode escape analysis estimates") \ 2932 \ 2933 product(intx, MaxBCEAEstimateLevel, 5, \ 2934 "Maximum number of nested calls that are analyzed by BC EA.") \ 2935 \ 2936 product(intx, MaxBCEAEstimateSize, 150, \ 2937 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2938 \ 2939 product(intx, AllocatePrefetchStyle, 1, \ 2940 "0 = no prefetch, " \ 2941 "1 = prefetch instructions for each allocation, " \ 2942 "2 = use TLAB watermark to gate allocation prefetch, " \ 2943 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2944 \ 2945 product(intx, AllocatePrefetchDistance, -1, \ 2946 "Distance to prefetch ahead of allocation pointer") \ 2947 \ 2948 product(intx, AllocatePrefetchLines, 3, \ 2949 "Number of lines to prefetch ahead of array allocation pointer") \ 2950 \ 2951 product(intx, AllocateInstancePrefetchLines, 1, \ 2952 "Number of lines to prefetch ahead of instance allocation pointer") \ 2953 \ 2954 product(intx, AllocatePrefetchStepSize, 16, \ 2955 "Step size in bytes of sequential prefetch instructions") \ 2956 \ 2957 product(intx, AllocatePrefetchInstr, 0, \ 2958 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2959 \ 2960 product(intx, ReadPrefetchInstr, 0, \ 2961 "Prefetch instruction to prefetch ahead") \ 2962 \ 2963 product(uintx, ArraycopySrcPrefetchDistance, 0, \ 2964 "Distance to prefetch source array in arracopy") \ 2965 \ 2966 product(uintx, ArraycopyDstPrefetchDistance, 0, \ 2967 "Distance to prefetch destination array in arracopy") \ 2968 \ 2969 /* deoptimization */ \ 2970 develop(bool, TraceDeoptimization, false, \ 2971 "Trace deoptimization") \ 2972 \ 2973 develop(bool, DebugDeoptimization, false, \ 2974 "Tracing various information while debugging deoptimization") \ 2975 \ 2976 product(intx, SelfDestructTimer, 0, \ 2977 "Will cause VM to terminate after a given time (in minutes) " \ 2978 "(0 means off)") \ 2979 \ 2980 product(intx, MaxJavaStackTraceDepth, 1024, \ 2981 "Max. no. of lines in the stack trace for Java exceptions " \ 2982 "(0 means all)") \ 2983 \ 2984 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2985 "Guarantee a safepoint (at least) every so many milliseconds " \ 2986 "(0 means none)")) \ 2987 \ 2988 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2989 "Guarantee a safepoint (at least) every so many milliseconds " \ 2990 "(0 means none)")) \ 2991 \ 2992 product(intx, SafepointTimeoutDelay, 10000, \ 2993 "Delay in milliseconds for option SafepointTimeout") \ 2994 \ 2995 product(intx, NmethodSweepFraction, 4, \ 2996 "Number of invocations of sweeper to cover all nmethods") \ 2997 \ 2998 product(intx, NmethodSweepCheckInterval, 5, \ 2999 "Compilers wake up every n seconds to possibly sweep nmethods") \ 3000 \ 3001 notproduct(bool, LogSweeper, false, \ 3002 "Keep a ring buffer of sweeper activity") \ 3003 \ 3004 notproduct(intx, SweeperLogEntries, 1024, \ 3005 "Number of records in the ring buffer of sweeper activity") \ 3006 \ 3007 notproduct(intx, MemProfilingInterval, 500, \ 3008 "Time between each invocation of the MemProfiler") \ 3009 \ 3010 develop(intx, MallocCatchPtr, -1, \ 3011 "Hit breakpoint when mallocing/freeing this pointer") \ 3012 \ 3013 notproduct(intx, AssertRepeat, 1, \ 3014 "number of times to evaluate expression in assert " \ 3015 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3016 \ 3017 notproduct(ccstrlist, SuppressErrorAt, "", \ 3018 "List of assertions (file:line) to muzzle") \ 3019 \ 3020 notproduct(uintx, HandleAllocationLimit, 1024, \ 3021 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3022 "is used") \ 3023 \ 3024 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3025 "Threshold for total handle allocation when " \ 3026 "+TraceHandleAllocation is used") \ 3027 \ 3028 develop(intx, StackPrintLimit, 100, \ 3029 "number of stack frames to print in VM-level stack dump") \ 3030 \ 3031 notproduct(intx, MaxElementPrintSize, 256, \ 3032 "maximum number of elements to print") \ 3033 \ 3034 notproduct(intx, MaxSubklassPrintSize, 4, \ 3035 "maximum number of subklasses to print when printing klass") \ 3036 \ 3037 product(intx, MaxInlineLevel, 9, \ 3038 "maximum number of nested calls that are inlined") \ 3039 \ 3040 product(intx, MaxRecursiveInlineLevel, 1, \ 3041 "maximum number of nested recursive calls that are inlined") \ 3042 \ 3043 product_pd(intx, InlineSmallCode, \ 3044 "Only inline already compiled methods if their code size is " \ 3045 "less than this") \ 3046 \ 3047 product(intx, MaxInlineSize, 35, \ 3048 "maximum bytecode size of a method to be inlined") \ 3049 \ 3050 product_pd(intx, FreqInlineSize, \ 3051 "maximum bytecode size of a frequent method to be inlined") \ 3052 \ 3053 product(intx, MaxTrivialSize, 6, \ 3054 "maximum bytecode size of a trivial method to be inlined") \ 3055 \ 3056 product(intx, MinInliningThreshold, 250, \ 3057 "min. invocation count a method needs to have to be inlined") \ 3058 \ 3059 develop(intx, AlignEntryCode, 4, \ 3060 "aligns entry code to specified value (in bytes)") \ 3061 \ 3062 develop(intx, MethodHistogramCutoff, 100, \ 3063 "cutoff value for method invoc. histogram (+CountCalls)") \ 3064 \ 3065 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3066 "# of interpreted methods to show in profile") \ 3067 \ 3068 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3069 "# of compiled methods to show in profile") \ 3070 \ 3071 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3072 "# of stub methods to show in profile") \ 3073 \ 3074 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3075 "# of runtime stub nodes to show in profile") \ 3076 \ 3077 product(intx, ProfileIntervalsTicks, 100, \ 3078 "# of ticks between printing of interval profile " \ 3079 "(+ProfileIntervals)") \ 3080 \ 3081 notproduct(intx, ScavengeALotInterval, 1, \ 3082 "Interval between which scavenge will occur with +ScavengeALot") \ 3083 \ 3084 notproduct(intx, FullGCALotInterval, 1, \ 3085 "Interval between which full gc will occur with +FullGCALot") \ 3086 \ 3087 notproduct(intx, FullGCALotStart, 0, \ 3088 "For which invocation to start FullGCAlot") \ 3089 \ 3090 notproduct(intx, FullGCALotDummies, 32*K, \ 3091 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3092 "to move") \ 3093 \ 3094 develop(intx, DontYieldALotInterval, 10, \ 3095 "Interval between which yields will be dropped (milliseconds)") \ 3096 \ 3097 develop(intx, MinSleepInterval, 1, \ 3098 "Minimum sleep() interval (milliseconds) when " \ 3099 "ConvertSleepToYield is off (used for SOLARIS)") \ 3100 \ 3101 product(intx, EventLogLength, 2000, \ 3102 "maximum nof events in event log") \ 3103 \ 3104 develop(intx, ProfilerPCTickThreshold, 15, \ 3105 "Number of ticks in a PC buckets to be a hotspot") \ 3106 \ 3107 notproduct(intx, DeoptimizeALotInterval, 5, \ 3108 "Number of exits until DeoptimizeALot kicks in") \ 3109 \ 3110 notproduct(intx, ZombieALotInterval, 5, \ 3111 "Number of exits until ZombieALot kicks in") \ 3112 \ 3113 develop(bool, StressNonEntrant, false, \ 3114 "Mark nmethods non-entrant at registration") \ 3115 \ 3116 diagnostic(intx, MallocVerifyInterval, 0, \ 3117 "if non-zero, verify C heap after every N calls to " \ 3118 "malloc/realloc/free") \ 3119 \ 3120 diagnostic(intx, MallocVerifyStart, 0, \ 3121 "if non-zero, start verifying C heap after Nth call to " \ 3122 "malloc/realloc/free") \ 3123 \ 3124 product(intx, TypeProfileWidth, 2, \ 3125 "number of receiver types to record in call/cast profile") \ 3126 \ 3127 develop(intx, BciProfileWidth, 2, \ 3128 "number of return bci's to record in ret profile") \ 3129 \ 3130 product(intx, PerMethodRecompilationCutoff, 400, \ 3131 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3132 \ 3133 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3134 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3135 \ 3136 product(intx, PerMethodTrapLimit, 100, \ 3137 "Limit on traps (of one kind) in a method (includes inlines)") \ 3138 \ 3139 product(intx, PerBytecodeTrapLimit, 4, \ 3140 "Limit on traps (of one kind) at a particular BCI") \ 3141 \ 3142 develop(intx, FreqCountInvocations, 1, \ 3143 "Scaling factor for branch frequencies (deprecated)") \ 3144 \ 3145 develop(intx, InlineFrequencyRatio, 20, \ 3146 "Ratio of call site execution to caller method invocation") \ 3147 \ 3148 develop_pd(intx, InlineFrequencyCount, \ 3149 "Count of call site execution necessary to trigger frequent " \ 3150 "inlining") \ 3151 \ 3152 develop(intx, InlineThrowCount, 50, \ 3153 "Force inlining of interpreted methods that throw this often") \ 3154 \ 3155 develop(intx, InlineThrowMaxSize, 200, \ 3156 "Force inlining of throwing methods smaller than this") \ 3157 \ 3158 product(intx, AliasLevel, 3, \ 3159 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3160 "2 for class split, 3 for unique instances") \ 3161 \ 3162 develop(bool, VerifyAliases, false, \ 3163 "perform extra checks on the results of alias analysis") \ 3164 \ 3165 develop(intx, ProfilerNodeSize, 1024, \ 3166 "Size in K to allocate for the Profile Nodes of each thread") \ 3167 \ 3168 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3169 "Number of times to spin wait on a v8 atomic operation lock") \ 3170 \ 3171 product(intx, ReadSpinIterations, 100, \ 3172 "Number of read attempts before a yield (spin inner loop)") \ 3173 \ 3174 product_pd(intx, PreInflateSpin, \ 3175 "Number of times to spin wait before inflation") \ 3176 \ 3177 product(intx, PreBlockSpin, 10, \ 3178 "Number of times to spin in an inflated lock before going to " \ 3179 "an OS lock") \ 3180 \ 3181 /* gc parameters */ \ 3182 product(uintx, InitialHeapSize, 0, \ 3183 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3184 \ 3185 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3186 "Maximum heap size (in bytes)") \ 3187 \ 3188 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3189 "Initial tenured generation size (in bytes)") \ 3190 \ 3191 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3192 "Initial new generation size (in bytes)") \ 3193 \ 3194 product(uintx, MaxNewSize, max_uintx, \ 3195 "Maximum new generation size (in bytes), max_uintx means set " \ 3196 "ergonomically") \ 3197 \ 3198 product(uintx, PretenureSizeThreshold, 0, \ 3199 "Maximum size in bytes of objects allocated in DefNew " \ 3200 "generation; zero means no maximum") \ 3201 \ 3202 product(uintx, TLABSize, 0, \ 3203 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3204 \ 3205 product(uintx, MinTLABSize, 2*K, \ 3206 "Minimum allowed TLAB size (in bytes)") \ 3207 \ 3208 product(uintx, TLABAllocationWeight, 35, \ 3209 "Allocation averaging weight") \ 3210 \ 3211 product(uintx, TLABWasteTargetPercent, 1, \ 3212 "Percentage of Eden that can be wasted") \ 3213 \ 3214 product(uintx, TLABRefillWasteFraction, 64, \ 3215 "Max TLAB waste at a refill (internal fragmentation)") \ 3216 \ 3217 product(uintx, TLABWasteIncrement, 4, \ 3218 "Increment allowed waste at slow allocation") \ 3219 \ 3220 product(intx, SurvivorRatio, 8, \ 3221 "Ratio of eden/survivor space size") \ 3222 \ 3223 product(intx, NewRatio, 2, \ 3224 "Ratio of new/old generation sizes") \ 3225 \ 3226 product_pd(uintx, NewSizeThreadIncrease, \ 3227 "Additional size added to desired new generation size per " \ 3228 "non-daemon thread (in bytes)") \ 3229 \ 3230 product_pd(uintx, PermSize, \ 3231 "Initial size of permanent generation (in bytes)") \ 3232 \ 3233 product_pd(uintx, MaxPermSize, \ 3234 "Maximum size of permanent generation (in bytes)") \ 3235 \ 3236 product(uintx, MinHeapFreeRatio, 40, \ 3237 "Min percentage of heap free after GC to avoid expansion") \ 3238 \ 3239 product(uintx, MaxHeapFreeRatio, 70, \ 3240 "Max percentage of heap free after GC to avoid shrinking") \ 3241 \ 3242 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3243 "Number of milliseconds per MB of free space in the heap") \ 3244 \ 3245 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3246 "Min change in heap space due to GC (in bytes)") \ 3247 \ 3248 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3249 "Min expansion of permanent heap (in bytes)") \ 3250 \ 3251 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3252 "Max expansion of permanent heap without full GC (in bytes)") \ 3253 \ 3254 product(intx, QueuedAllocationWarningCount, 0, \ 3255 "Number of times an allocation that queues behind a GC " \ 3256 "will retry before printing a warning") \ 3257 \ 3258 diagnostic(uintx, VerifyGCStartAt, 0, \ 3259 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3260 \ 3261 diagnostic(intx, VerifyGCLevel, 0, \ 3262 "Generation level at which to start +VerifyBefore/AfterGC") \ 3263 \ 3264 develop(uintx, ExitAfterGCNum, 0, \ 3265 "If non-zero, exit after this GC.") \ 3266 \ 3267 product(intx, MaxTenuringThreshold, 15, \ 3268 "Maximum value for tenuring threshold") \ 3269 \ 3270 product(intx, InitialTenuringThreshold, 7, \ 3271 "Initial value for tenuring threshold") \ 3272 \ 3273 product(intx, TargetSurvivorRatio, 50, \ 3274 "Desired percentage of survivor space used after scavenge") \ 3275 \ 3276 product(uintx, MarkSweepDeadRatio, 5, \ 3277 "Percentage (0-100) of the old gen allowed as dead wood." \ 3278 "Serial mark sweep treats this as both the min and max value." \ 3279 "CMS uses this value only if it falls back to mark sweep." \ 3280 "Par compact uses a variable scale based on the density of the" \ 3281 "generation and treats this as the max value when the heap is" \ 3282 "either completely full or completely empty. Par compact also" \ 3283 "has a smaller default value; see arguments.cpp.") \ 3284 \ 3285 product(uintx, PermMarkSweepDeadRatio, 20, \ 3286 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3287 "See MarkSweepDeadRatio for collector-specific comments.") \ 3288 \ 3289 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3290 "How often should we fully compact the heap (ignoring the dead " \ 3291 "space parameters)") \ 3292 \ 3293 product(intx, PrintCMSStatistics, 0, \ 3294 "Statistics for CMS") \ 3295 \ 3296 product(bool, PrintCMSInitiationStatistics, false, \ 3297 "Statistics for initiating a CMS collection") \ 3298 \ 3299 product(intx, PrintFLSStatistics, 0, \ 3300 "Statistics for CMS' FreeListSpace") \ 3301 \ 3302 product(intx, PrintFLSCensus, 0, \ 3303 "Census for CMS' FreeListSpace") \ 3304 \ 3305 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3306 "Delay in ms between expansion and allocation") \ 3307 \ 3308 product(intx, DeferThrSuspendLoopCount, 4000, \ 3309 "(Unstable) Number of times to iterate in safepoint loop " \ 3310 " before blocking VM threads ") \ 3311 \ 3312 product(intx, DeferPollingPageLoopCount, -1, \ 3313 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3314 "before changing safepoint polling page to RO ") \ 3315 \ 3316 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3317 \ 3318 product(bool, PSChunkLargeArrays, true, \ 3319 "true: process large arrays in chunks") \ 3320 \ 3321 product(uintx, GCDrainStackTargetSize, 64, \ 3322 "how many entries we'll try to leave on the stack during " \ 3323 "parallel GC") \ 3324 \ 3325 /* stack parameters */ \ 3326 product_pd(intx, StackYellowPages, \ 3327 "Number of yellow zone (recoverable overflows) pages") \ 3328 \ 3329 product_pd(intx, StackRedPages, \ 3330 "Number of red zone (unrecoverable overflows) pages") \ 3331 \ 3332 product_pd(intx, StackShadowPages, \ 3333 "Number of shadow zone (for overflow checking) pages" \ 3334 " this should exceed the depth of the VM and native call stack") \ 3335 \ 3336 product_pd(intx, ThreadStackSize, \ 3337 "Thread Stack Size (in Kbytes)") \ 3338 \ 3339 product_pd(intx, VMThreadStackSize, \ 3340 "Non-Java Thread Stack Size (in Kbytes)") \ 3341 \ 3342 product_pd(intx, CompilerThreadStackSize, \ 3343 "Compiler Thread Stack Size (in Kbytes)") \ 3344 \ 3345 develop_pd(uintx, JVMInvokeMethodSlack, \ 3346 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3347 \ 3348 product(uintx, ThreadSafetyMargin, 50*M, \ 3349 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3350 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3351 "disable this feature") \ 3352 \ 3353 /* code cache parameters */ \ 3354 develop(uintx, CodeCacheSegmentSize, 64, \ 3355 "Code cache segment size (in bytes) - smallest unit of " \ 3356 "allocation") \ 3357 \ 3358 develop_pd(intx, CodeEntryAlignment, \ 3359 "Code entry alignment for generated code (in bytes)") \ 3360 \ 3361 product_pd(intx, OptoLoopAlignment, \ 3362 "Align inner loops to zero relative to this modulus") \ 3363 \ 3364 product_pd(uintx, InitialCodeCacheSize, \ 3365 "Initial code cache size (in bytes)") \ 3366 \ 3367 product_pd(uintx, ReservedCodeCacheSize, \ 3368 "Reserved code cache size (in bytes) - maximum code cache size") \ 3369 \ 3370 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3371 "When less than X space left, we stop compiling.") \ 3372 \ 3373 product_pd(uintx, CodeCacheExpansionSize, \ 3374 "Code cache expansion size (in bytes)") \ 3375 \ 3376 develop_pd(uintx, CodeCacheMinBlockLength, \ 3377 "Minimum number of segments in a code cache block.") \ 3378 \ 3379 notproduct(bool, ExitOnFullCodeCache, false, \ 3380 "Exit the VM if we fill the code cache.") \ 3381 \ 3382 product(bool, UseCodeCacheFlushing, true, \ 3383 "Attempt to clean the code cache before shutting off compiler") \ 3384 \ 3385 product(intx, MinCodeCacheFlushingInterval, 30, \ 3386 "Min number of seconds between code cache cleaning sessions") \ 3387 \ 3388 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3389 "When less than X space left, start code cache cleaning") \ 3390 \ 3391 /* interpreter debugging */ \ 3392 develop(intx, BinarySwitchThreshold, 5, \ 3393 "Minimal number of lookupswitch entries for rewriting to binary " \ 3394 "switch") \ 3395 \ 3396 develop(intx, StopInterpreterAt, 0, \ 3397 "Stops interpreter execution at specified bytecode number") \ 3398 \ 3399 develop(intx, TraceBytecodesAt, 0, \ 3400 "Traces bytecodes starting with specified bytecode number") \ 3401 \ 3402 /* compiler interface */ \ 3403 develop(intx, CIStart, 0, \ 3404 "the id of the first compilation to permit") \ 3405 \ 3406 develop(intx, CIStop, -1, \ 3407 "the id of the last compilation to permit") \ 3408 \ 3409 develop(intx, CIStartOSR, 0, \ 3410 "the id of the first osr compilation to permit " \ 3411 "(CICountOSR must be on)") \ 3412 \ 3413 develop(intx, CIStopOSR, -1, \ 3414 "the id of the last osr compilation to permit " \ 3415 "(CICountOSR must be on)") \ 3416 \ 3417 develop(intx, CIBreakAtOSR, -1, \ 3418 "id of osr compilation to break at") \ 3419 \ 3420 develop(intx, CIBreakAt, -1, \ 3421 "id of compilation to break at") \ 3422 \ 3423 product(ccstrlist, CompileOnly, "", \ 3424 "List of methods (pkg/class.name) to restrict compilation to") \ 3425 \ 3426 product(ccstr, CompileCommandFile, NULL, \ 3427 "Read compiler commands from this file [.hotspot_compiler]") \ 3428 \ 3429 product(ccstrlist, CompileCommand, "", \ 3430 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3431 \ 3432 product(bool, CICompilerCountPerCPU, false, \ 3433 "1 compiler thread for log(N CPUs)") \ 3434 \ 3435 develop(intx, CIFireOOMAt, -1, \ 3436 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3437 "(non-negative value throws OOM after this many CI accesses " \ 3438 "in each compile)") \ 3439 \ 3440 develop(intx, CIFireOOMAtDelay, -1, \ 3441 "Wait for this many CI accesses to occur in all compiles before " \ 3442 "beginning to throw OutOfMemoryErrors in each compile") \ 3443 \ 3444 notproduct(bool, CIObjectFactoryVerify, false, \ 3445 "enable potentially expensive verification in ciObjectFactory") \ 3446 \ 3447 /* Priorities */ \ 3448 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3449 \ 3450 product(intx, ThreadPriorityPolicy, 0, \ 3451 "0 : Normal. "\ 3452 " VM chooses priorities that are appropriate for normal "\ 3453 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3454 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3455 " map to lower native priority values. On Windows applications"\ 3456 " are allowed to use higher native priorities. However, with "\ 3457 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3458 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3459 " interfere with system threads. On Linux thread priorities "\ 3460 " are ignored because the OS does not support static priority "\ 3461 " in SCHED_OTHER scheduling class which is the only choice for"\ 3462 " non-root, non-realtime applications. "\ 3463 "1 : Aggressive. "\ 3464 " Java thread priorities map over to the entire range of "\ 3465 " native thread priorities. Higher Java thread priorities map "\ 3466 " to higher native thread priorities. This policy should be "\ 3467 " used with care, as sometimes it can cause performance "\ 3468 " degradation in the application and/or the entire system. On "\ 3469 " Linux this policy requires root privilege.") \ 3470 \ 3471 product(bool, ThreadPriorityVerbose, false, \ 3472 "print priority changes") \ 3473 \ 3474 product(intx, DefaultThreadPriority, -1, \ 3475 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3476 \ 3477 product(intx, CompilerThreadPriority, -1, \ 3478 "what priority should compiler threads run at (-1 means no change)") \ 3479 \ 3480 product(intx, VMThreadPriority, -1, \ 3481 "what priority should VM threads run at (-1 means no change)") \ 3482 \ 3483 product(bool, CompilerThreadHintNoPreempt, true, \ 3484 "(Solaris only) Give compiler threads an extra quanta") \ 3485 \ 3486 product(bool, VMThreadHintNoPreempt, false, \ 3487 "(Solaris only) Give VM thread an extra quanta") \ 3488 \ 3489 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3490 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3491 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3492 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3493 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3494 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3495 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3496 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3497 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3498 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3499 \ 3500 /* compiler debugging */ \ 3501 notproduct(intx, CompileTheWorldStartAt, 1, \ 3502 "First class to consider when using +CompileTheWorld") \ 3503 \ 3504 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3505 "Last class to consider when using +CompileTheWorld") \ 3506 \ 3507 develop(intx, NewCodeParameter, 0, \ 3508 "Testing Only: Create a dedicated integer parameter before " \ 3509 "putback") \ 3510 \ 3511 /* new oopmap storage allocation */ \ 3512 develop(intx, MinOopMapAllocation, 8, \ 3513 "Minimum number of OopMap entries in an OopMapSet") \ 3514 \ 3515 /* Background Compilation */ \ 3516 develop(intx, LongCompileThreshold, 50, \ 3517 "Used with +TraceLongCompiles") \ 3518 \ 3519 product(intx, StarvationMonitorInterval, 200, \ 3520 "Pause between each check in ms") \ 3521 \ 3522 /* recompilation */ \ 3523 product_pd(intx, CompileThreshold, \ 3524 "number of interpreted method invocations before (re-)compiling") \ 3525 \ 3526 product_pd(intx, BackEdgeThreshold, \ 3527 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3528 \ 3529 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3530 "Interpreter (tier 0) invocation notification frequency.") \ 3531 \ 3532 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3533 "C1 without MDO (tier 2) invocation notification frequency.") \ 3534 \ 3535 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3536 "C1 with MDO profiling (tier 3) invocation notification " \ 3537 "frequency.") \ 3538 \ 3539 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3540 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3541 \ 3542 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3543 "Interpreter (tier 0) invocation notification frequency.") \ 3544 \ 3545 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3546 "C1 without MDO (tier 2) invocation notification frequency.") \ 3547 \ 3548 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3549 "C1 with MDO profiling (tier 3) invocation notification " \ 3550 "frequency.") \ 3551 \ 3552 product(intx, Tier2CompileThreshold, 0, \ 3553 "threshold at which tier 2 compilation is invoked") \ 3554 \ 3555 product(intx, Tier2BackEdgeThreshold, 0, \ 3556 "Back edge threshold at which tier 2 compilation is invoked") \ 3557 \ 3558 product(intx, Tier3InvocationThreshold, 200, \ 3559 "Compile if number of method invocations crosses this " \ 3560 "threshold") \ 3561 \ 3562 product(intx, Tier3MinInvocationThreshold, 100, \ 3563 "Minimum invocation to compile at tier 3") \ 3564 \ 3565 product(intx, Tier3CompileThreshold, 2000, \ 3566 "Threshold at which tier 3 compilation is invoked (invocation " \ 3567 "minimum must be satisfied.") \ 3568 \ 3569 product(intx, Tier3BackEdgeThreshold, 7000, \ 3570 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3571 \ 3572 product(intx, Tier4InvocationThreshold, 5000, \ 3573 "Compile if number of method invocations crosses this " \ 3574 "threshold") \ 3575 \ 3576 product(intx, Tier4MinInvocationThreshold, 600, \ 3577 "Minimum invocation to compile at tier 4") \ 3578 \ 3579 product(intx, Tier4CompileThreshold, 15000, \ 3580 "Threshold at which tier 4 compilation is invoked (invocation " \ 3581 "minimum must be satisfied.") \ 3582 \ 3583 product(intx, Tier4BackEdgeThreshold, 40000, \ 3584 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3585 \ 3586 product(intx, Tier3DelayOn, 5, \ 3587 "If C2 queue size grows over this amount per compiler thread " \ 3588 "stop compiling at tier 3 and start compiling at tier 2") \ 3589 \ 3590 product(intx, Tier3DelayOff, 2, \ 3591 "If C2 queue size is less than this amount per compiler thread " \ 3592 "allow methods compiled at tier 2 transition to tier 3") \ 3593 \ 3594 product(intx, Tier3LoadFeedback, 5, \ 3595 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3596 "reaches this amount per compiler thread") \ 3597 \ 3598 product(intx, Tier4LoadFeedback, 3, \ 3599 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3600 "reaches this amount per compiler thread") \ 3601 \ 3602 product(intx, TieredCompileTaskTimeout, 50, \ 3603 "Kill compile task if method was not used within " \ 3604 "given timeout in milliseconds") \ 3605 \ 3606 product(intx, TieredStopAtLevel, 4, \ 3607 "Stop at given compilation level") \ 3608 \ 3609 product(intx, Tier0ProfilingStartPercentage, 200, \ 3610 "Start profiling in interpreter if the counters exceed tier 3" \ 3611 "thresholds by the specified percentage") \ 3612 \ 3613 product(intx, TieredRateUpdateMinTime, 1, \ 3614 "Minimum rate sampling interval (in milliseconds)") \ 3615 \ 3616 product(intx, TieredRateUpdateMaxTime, 25, \ 3617 "Maximum rate sampling interval (in milliseconds)") \ 3618 \ 3619 product_pd(bool, TieredCompilation, \ 3620 "Enable tiered compilation") \ 3621 \ 3622 product(bool, PrintTieredEvents, false, \ 3623 "Print tiered events notifications") \ 3624 \ 3625 product(bool, StressTieredRuntime, false, \ 3626 "Alternate client and server compiler on compile requests") \ 3627 \ 3628 product_pd(intx, OnStackReplacePercentage, \ 3629 "NON_TIERED number of method invocations/branches (expressed as %"\ 3630 "of CompileThreshold) before (re-)compiling OSR code") \ 3631 \ 3632 product(intx, InterpreterProfilePercentage, 33, \ 3633 "NON_TIERED number of method invocations/branches (expressed as %"\ 3634 "of CompileThreshold) before profiling in the interpreter") \ 3635 \ 3636 develop(intx, MaxRecompilationSearchLength, 10, \ 3637 "max. # frames to inspect searching for recompilee") \ 3638 \ 3639 develop(intx, MaxInterpretedSearchLength, 3, \ 3640 "max. # interp. frames to skip when searching for recompilee") \ 3641 \ 3642 develop(intx, DesiredMethodLimit, 8000, \ 3643 "desired max. method size (in bytecodes) after inlining") \ 3644 \ 3645 develop(intx, HugeMethodLimit, 8000, \ 3646 "don't compile methods larger than this if " \ 3647 "+DontCompileHugeMethods") \ 3648 \ 3649 /* New JDK 1.4 reflection implementation */ \ 3650 \ 3651 develop(bool, UseNewReflection, true, \ 3652 "Temporary flag for transition to reflection based on dynamic " \ 3653 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3654 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3655 "changes were needed") \ 3656 \ 3657 develop(bool, VerifyReflectionBytecodes, false, \ 3658 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3659 "in situations like that described in 4486457 or for " \ 3660 "constructors generated for serialization, so can not be enabled "\ 3661 "in product.") \ 3662 \ 3663 product(bool, ReflectionWrapResolutionErrors, true, \ 3664 "Temporary flag for transition to AbstractMethodError wrapped " \ 3665 "in InvocationTargetException. See 6531596") \ 3666 \ 3667 \ 3668 develop(intx, FastSuperclassLimit, 8, \ 3669 "Depth of hardwired instanceof accelerator array") \ 3670 \ 3671 /* Properties for Java libraries */ \ 3672 \ 3673 product(intx, MaxDirectMemorySize, -1, \ 3674 "Maximum total size of NIO direct-buffer allocations") \ 3675 \ 3676 /* temporary developer defined flags */ \ 3677 \ 3678 diagnostic(bool, UseNewCode, false, \ 3679 "Testing Only: Use the new version while testing") \ 3680 \ 3681 diagnostic(bool, UseNewCode2, false, \ 3682 "Testing Only: Use the new version while testing") \ 3683 \ 3684 diagnostic(bool, UseNewCode3, false, \ 3685 "Testing Only: Use the new version while testing") \ 3686 \ 3687 /* flags for performance data collection */ \ 3688 \ 3689 product(bool, UsePerfData, falseInEmbedded, \ 3690 "Flag to disable jvmstat instrumentation for performance testing" \ 3691 "and problem isolation purposes.") \ 3692 \ 3693 product(bool, PerfDataSaveToFile, false, \ 3694 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3695 \ 3696 product(ccstr, PerfDataSaveFile, NULL, \ 3697 "Save PerfData memory to the specified absolute pathname," \ 3698 "%p in the file name if present will be replaced by pid") \ 3699 \ 3700 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3701 "Data sampling interval in milliseconds") \ 3702 \ 3703 develop(bool, PerfTraceDataCreation, false, \ 3704 "Trace creation of Performance Data Entries") \ 3705 \ 3706 develop(bool, PerfTraceMemOps, false, \ 3707 "Trace PerfMemory create/attach/detach calls") \ 3708 \ 3709 product(bool, PerfDisableSharedMem, false, \ 3710 "Store performance data in standard memory") \ 3711 \ 3712 product(intx, PerfDataMemorySize, 32*K, \ 3713 "Size of performance data memory region. Will be rounded " \ 3714 "up to a multiple of the native os page size.") \ 3715 \ 3716 product(intx, PerfMaxStringConstLength, 1024, \ 3717 "Maximum PerfStringConstant string length before truncation") \ 3718 \ 3719 product(bool, PerfAllowAtExitRegistration, false, \ 3720 "Allow registration of atexit() methods") \ 3721 \ 3722 product(bool, PerfBypassFileSystemCheck, false, \ 3723 "Bypass Win32 file system criteria checks (Windows Only)") \ 3724 \ 3725 product(intx, UnguardOnExecutionViolation, 0, \ 3726 "Unguard page and retry on no-execute fault (Win32 only)" \ 3727 "0=off, 1=conservative, 2=aggressive") \ 3728 \ 3729 /* Serviceability Support */ \ 3730 \ 3731 product(bool, ManagementServer, false, \ 3732 "Create JMX Management Server") \ 3733 \ 3734 product(bool, DisableAttachMechanism, false, \ 3735 "Disable mechanism that allows tools to attach to this VM") \ 3736 \ 3737 product(bool, StartAttachListener, false, \ 3738 "Always start Attach Listener at VM startup") \ 3739 \ 3740 manageable(bool, PrintConcurrentLocks, false, \ 3741 "Print java.util.concurrent locks in thread dump") \ 3742 \ 3743 product(bool, TransmitErrorReport, false, \ 3744 "Enable error report transmission on erroneous termination") \ 3745 \ 3746 product(ccstr, ErrorReportServer, NULL, \ 3747 "Override built-in error report server address") \ 3748 \ 3749 /* Shared spaces */ \ 3750 \ 3751 product(bool, UseSharedSpaces, true, \ 3752 "Use shared spaces in the permanent generation") \ 3753 \ 3754 product(bool, RequireSharedSpaces, false, \ 3755 "Require shared spaces in the permanent generation") \ 3756 \ 3757 product(bool, DumpSharedSpaces, false, \ 3758 "Special mode: JVM reads a class list, loads classes, builds " \ 3759 "shared spaces, and dumps the shared spaces to a file to be " \ 3760 "used in future JVM runs.") \ 3761 \ 3762 product(bool, PrintSharedSpaces, false, \ 3763 "Print usage of shared spaces") \ 3764 \ 3765 product(uintx, SharedDummyBlockSize, 512*M, \ 3766 "Size of dummy block used to shift heap addresses (in bytes)") \ 3767 \ 3768 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3769 "Size of read-write space in permanent generation (in bytes)") \ 3770 \ 3771 product(uintx, SharedReadOnlySize, 10*M, \ 3772 "Size of read-only space in permanent generation (in bytes)") \ 3773 \ 3774 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3775 "Size of the shared data area adjacent to the heap (in bytes)") \ 3776 \ 3777 product(uintx, SharedMiscCodeSize, 4*M, \ 3778 "Size of the shared code area adjacent to the heap (in bytes)") \ 3779 \ 3780 diagnostic(bool, SharedOptimizeColdStart, true, \ 3781 "At dump time, order shared objects to achieve better " \ 3782 "cold startup time.") \ 3783 \ 3784 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3785 "Reordering policy for SharedOptimizeColdStart " \ 3786 "0=favor classload-time locality, 1=balanced, " \ 3787 "2=favor runtime locality") \ 3788 \ 3789 diagnostic(bool, SharedSkipVerify, false, \ 3790 "Skip assert() and verify() which page-in unwanted shared " \ 3791 "objects. ") \ 3792 \ 3793 diagnostic(bool, EnableInvokeDynamic, true, \ 3794 "support JSR 292 (method handles, invokedynamic, " \ 3795 "anonymous classes") \ 3796 \ 3797 product(bool, AnonymousClasses, false, \ 3798 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3799 \ 3800 experimental(bool, EnableMethodHandles, false, \ 3801 "support method handles (deprecated)") \ 3802 \ 3803 diagnostic(intx, MethodHandlePushLimit, 3, \ 3804 "number of additional stack slots a method handle may push") \ 3805 \ 3806 diagnostic(bool, PrintMethodHandleStubs, false, \ 3807 "Print generated stub code for method handles") \ 3808 \ 3809 develop(bool, TraceMethodHandles, false, \ 3810 "trace internal method handle operations") \ 3811 \ 3812 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3813 "perform extra checks when constructing method handles") \ 3814 \ 3815 diagnostic(bool, OptimizeMethodHandles, true, \ 3816 "when constructing method handles, try to improve them") \ 3817 \ 3818 develop(bool, StressMethodHandleWalk, false, \ 3819 "Process all method handles with MethodHandleWalk") \ 3820 \ 3821 diagnostic(bool, UseRicochetFrames, true, \ 3822 "use ricochet stack frames for method handle combination, " \ 3823 "if the platform supports them") \ 3824 \ 3825 experimental(bool, TrustFinalNonStaticFields, false, \ 3826 "trust final non-static declarations for constant folding") \ 3827 \ 3828 experimental(bool, AllowInvokeGeneric, false, \ 3829 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3830 "as equivalent methods") \ 3831 \ 3832 develop(bool, TraceInvokeDynamic, false, \ 3833 "trace internal invoke dynamic operations") \ 3834 \ 3835 diagnostic(bool, PauseAtStartup, false, \ 3836 "Causes the VM to pause at startup time and wait for the pause " \ 3837 "file to be removed (default: ./vm.paused.<pid>)") \ 3838 \ 3839 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3840 "The file to create and for whose removal to await when pausing " \ 3841 "at startup. (default: ./vm.paused.<pid>)") \ 3842 \ 3843 diagnostic(bool, PauseAtExit, false, \ 3844 "Pause and wait for keypress on exit if a debugger is attached") \ 3845 \ 3846 product(bool, ExtendedDTraceProbes, false, \ 3847 "Enable performance-impacting dtrace probes") \ 3848 \ 3849 product(bool, DTraceMethodProbes, false, \ 3850 "Enable dtrace probes for method-entry and method-exit") \ 3851 \ 3852 product(bool, DTraceAllocProbes, false, \ 3853 "Enable dtrace probes for object allocation") \ 3854 \ 3855 product(bool, DTraceMonitorProbes, false, \ 3856 "Enable dtrace probes for monitor events") \ 3857 \ 3858 product(bool, RelaxAccessControlCheck, false, \ 3859 "Relax the access control checks in the verifier") \ 3860 \ 3861 diagnostic(bool, PrintDTraceDOF, false, \ 3862 "Print the DTrace DOF passed to the system for JSDT probes") \ 3863 \ 3864 product(uintx, StringTableSize, 1009, \ 3865 "Number of buckets in the interned String table") \ 3866 \ 3867 product(bool, UseVMInterruptibleIO, false, \ 3868 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3869 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3870 " of this flag is true for JDK 6 and earliers") 3871 3872/* 3873 * Macros for factoring of globals 3874 */ 3875 3876// Interface macros 3877#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3878#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3879#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3880#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3881#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3882#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3883#ifdef PRODUCT 3884#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3885#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3886#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3887#else 3888#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3889#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3890#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3891#endif 3892// Special LP64 flags, product only needed for now. 3893#ifdef _LP64 3894#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3895#else 3896#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3897#endif // _LP64 3898 3899// Implementation macros 3900#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3901#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3902#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3903#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3904#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3905#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3906#ifdef PRODUCT 3907#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3908#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3909#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3910#else 3911#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3912#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3913#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3914#endif 3915#ifdef _LP64 3916#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3917#else 3918#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3919#endif // _LP64 3920 3921RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG) 3922 3923RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3924 3925#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3926