Java example source code file (globals.hpp)
The globals.hpp Java example source code
/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
#define SHARE_VM_RUNTIME_GLOBALS_HPP
#include "utilities/debug.hpp"
// use this for flags that are true per default in the tiered build
// but false in non-tiered builds, and vice versa
#ifdef TIERED
#define trueInTiered true
#define falseInTiered false
#else
#define trueInTiered false
#define falseInTiered true
#endif
#ifdef TARGET_ARCH_x86
# include "globals_x86.hpp"
#endif
#ifdef TARGET_ARCH_sparc
# include "globals_sparc.hpp"
#endif
#ifdef TARGET_ARCH_zero
# include "globals_zero.hpp"
#endif
#ifdef TARGET_ARCH_arm
# include "globals_arm.hpp"
#endif
#ifdef TARGET_ARCH_ppc
# include "globals_ppc.hpp"
#endif
#ifdef TARGET_OS_FAMILY_linux
# include "globals_linux.hpp"
#endif
#ifdef TARGET_OS_FAMILY_solaris
# include "globals_solaris.hpp"
#endif
#ifdef TARGET_OS_FAMILY_windows
# include "globals_windows.hpp"
#endif
#ifdef TARGET_OS_FAMILY_bsd
# include "globals_bsd.hpp"
#endif
#ifdef TARGET_OS_ARCH_linux_x86
# include "globals_linux_x86.hpp"
#endif
#ifdef TARGET_OS_ARCH_linux_sparc
# include "globals_linux_sparc.hpp"
#endif
#ifdef TARGET_OS_ARCH_linux_zero
# include "globals_linux_zero.hpp"
#endif
#ifdef TARGET_OS_ARCH_solaris_x86
# include "globals_solaris_x86.hpp"
#endif
#ifdef TARGET_OS_ARCH_solaris_sparc
# include "globals_solaris_sparc.hpp"
#endif
#ifdef TARGET_OS_ARCH_windows_x86
# include "globals_windows_x86.hpp"
#endif
#ifdef TARGET_OS_ARCH_linux_arm
# include "globals_linux_arm.hpp"
#endif
#ifdef TARGET_OS_ARCH_linux_ppc
# include "globals_linux_ppc.hpp"
#endif
#ifdef TARGET_OS_ARCH_bsd_x86
# include "globals_bsd_x86.hpp"
#endif
#ifdef TARGET_OS_ARCH_bsd_zero
# include "globals_bsd_zero.hpp"
#endif
#ifdef COMPILER1
#ifdef TARGET_ARCH_x86
# include "c1_globals_x86.hpp"
#endif
#ifdef TARGET_ARCH_sparc
# include "c1_globals_sparc.hpp"
#endif
#ifdef TARGET_ARCH_arm
# include "c1_globals_arm.hpp"
#endif
#ifdef TARGET_ARCH_ppc
# include "c1_globals_ppc.hpp"
#endif
#ifdef TARGET_OS_FAMILY_linux
# include "c1_globals_linux.hpp"
#endif
#ifdef TARGET_OS_FAMILY_solaris
# include "c1_globals_solaris.hpp"
#endif
#ifdef TARGET_OS_FAMILY_windows
# include "c1_globals_windows.hpp"
#endif
#ifdef TARGET_OS_FAMILY_bsd
# include "c1_globals_bsd.hpp"
#endif
#endif
#ifdef COMPILER2
#ifdef TARGET_ARCH_x86
# include "c2_globals_x86.hpp"
#endif
#ifdef TARGET_ARCH_sparc
# include "c2_globals_sparc.hpp"
#endif
#ifdef TARGET_ARCH_arm
# include "c2_globals_arm.hpp"
#endif
#ifdef TARGET_OS_FAMILY_linux
# include "c2_globals_linux.hpp"
#endif
#ifdef TARGET_OS_FAMILY_solaris
# include "c2_globals_solaris.hpp"
#endif
#ifdef TARGET_OS_FAMILY_windows
# include "c2_globals_windows.hpp"
#endif
#ifdef TARGET_OS_FAMILY_bsd
# include "c2_globals_bsd.hpp"
#endif
#endif
#ifdef SHARK
#ifdef TARGET_ARCH_zero
# include "shark_globals_zero.hpp"
#endif
#endif
#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
define_pd_global(bool, BackgroundCompilation, false);
define_pd_global(bool, UseTLAB, false);
define_pd_global(bool, CICompileOSR, false);
define_pd_global(bool, UseTypeProfile, false);
define_pd_global(bool, UseOnStackReplacement, false);
define_pd_global(bool, InlineIntrinsics, false);
define_pd_global(bool, PreferInterpreterNativeStubs, true);
define_pd_global(bool, ProfileInterpreter, false);
define_pd_global(bool, ProfileTraps, false);
define_pd_global(bool, TieredCompilation, false);
define_pd_global(intx, CompileThreshold, 0);
define_pd_global(intx, BackEdgeThreshold, 0);
define_pd_global(intx, OnStackReplacePercentage, 0);
define_pd_global(bool, ResizeTLAB, false);
define_pd_global(intx, FreqInlineSize, 0);
define_pd_global(intx, InlineSmallCode, 0);
define_pd_global(intx, NewSizeThreadIncrease, 4*K);
define_pd_global(intx, InlineClassNatives, true);
define_pd_global(intx, InlineUnsafeOps, true);
define_pd_global(intx, InitialCodeCacheSize, 160*K);
define_pd_global(intx, ReservedCodeCacheSize, 32*M);
define_pd_global(intx, CodeCacheExpansionSize, 32*K);
define_pd_global(intx, CodeCacheMinBlockLength, 1);
define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K);
define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M));
define_pd_global(bool, NeverActAsServerClassMachine, true);
define_pd_global(uint64_t,MaxRAM, 1ULL*G);
#define CI_COMPILER_COUNT 0
#else
#ifdef COMPILER2
#define CI_COMPILER_COUNT 2
#else
#define CI_COMPILER_COUNT 1
#endif // COMPILER2
#endif // no compilers
// string type aliases used only in this file
typedef const char* ccstr;
typedef const char* ccstrlist; // represents string arguments which accumulate
struct Flag {
enum Flags {
// value origin
DEFAULT = 0,
COMMAND_LINE = 1,
ENVIRON_VAR = 2,
CONFIG_FILE = 3,
MANAGEMENT = 4,
ERGONOMIC = 5,
ATTACH_ON_DEMAND = 6,
INTERNAL = 7,
LAST_VALUE_ORIGIN = INTERNAL,
VALUE_ORIGIN_BITS = 4,
VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
// flag kind
KIND_PRODUCT = 1 << 4,
KIND_MANAGEABLE = 1 << 5,
KIND_DIAGNOSTIC = 1 << 6,
KIND_EXPERIMENTAL = 1 << 7,
KIND_NOT_PRODUCT = 1 << 8,
KIND_DEVELOP = 1 << 9,
KIND_PLATFORM_DEPENDENT = 1 << 10,
KIND_READ_WRITE = 1 << 11,
KIND_C1 = 1 << 12,
KIND_C2 = 1 << 13,
KIND_ARCH = 1 << 14,
KIND_SHARK = 1 << 15,
KIND_LP64_PRODUCT = 1 << 16,
KIND_COMMERCIAL = 1 << 17,
KIND_MASK = ~VALUE_ORIGIN_MASK
};
const char* _type;
const char* _name;
void* _addr;
NOT_PRODUCT(const char* _doc;)
Flags _flags;
// points to all Flags static array
static Flag* flags;
// number of flags
static size_t numFlags;
static Flag* find_flag(const char* name, size_t length, bool allow_locked = false);
static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
void check_writable();
bool is_bool() const;
bool get_bool() const;
void set_bool(bool value);
bool is_intx() const;
intx get_intx() const;
void set_intx(intx value);
bool is_uintx() const;
uintx get_uintx() const;
void set_uintx(uintx value);
bool is_uint64_t() const;
uint64_t get_uint64_t() const;
void set_uint64_t(uint64_t value);
bool is_double() const;
double get_double() const;
void set_double(double value);
bool is_ccstr() const;
bool ccstr_accumulates() const;
ccstr get_ccstr() const;
void set_ccstr(ccstr value);
Flags get_origin();
void set_origin(Flags origin);
bool is_default();
bool is_ergonomic();
bool is_command_line();
bool is_product() const;
bool is_manageable() const;
bool is_diagnostic() const;
bool is_experimental() const;
bool is_notproduct() const;
bool is_develop() const;
bool is_read_write() const;
bool is_commercial() const;
bool is_constant_in_binary() const;
bool is_unlocker() const;
bool is_unlocked() const;
bool is_writeable() const;
bool is_external() const;
bool is_unlocker_ext() const;
bool is_unlocked_ext() const;
bool is_writeable_ext() const;
bool is_external_ext() const;
void get_locked_message(char*, int) const;
void get_locked_message_ext(char*, int) const;
void print_on(outputStream* st, bool withComments = false );
void print_kind(outputStream* st);
void print_as_flag(outputStream* st);
};
// debug flags control various aspects of the VM and are global accessible
// use FlagSetting to temporarily change some debug flag
// e.g. FlagSetting fs(DebugThisAndThat, true);
// restored to previous value upon leaving scope
class FlagSetting {
bool val;
bool* flag;
public:
FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
~FlagSetting() { *flag = val; }
};
class CounterSetting {
intx* counter;
public:
CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
~CounterSetting() { (*counter)--; }
};
class UIntFlagSetting {
uintx val;
uintx* flag;
public:
UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
~UIntFlagSetting() { *flag = val; }
};
class DoubleFlagSetting {
double val;
double* flag;
public:
DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
~DoubleFlagSetting() { *flag = val; }
};
class CommandLineFlags {
public:
static bool boolAt(char* name, size_t len, bool* value);
static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); }
static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin);
static bool boolAtPut(char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); }
static bool intxAt(char* name, size_t len, intx* value);
static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); }
static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin);
static bool intxAtPut(char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); }
static bool uintxAt(char* name, size_t len, uintx* value);
static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); }
static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin);
static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
static bool uint64_tAt(char* name, size_t len, uint64_t* value);
static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin);
static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
static bool doubleAt(char* name, size_t len, double* value);
static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); }
static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin);
static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
static bool ccstrAt(char* name, size_t len, ccstr* value);
static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); }
static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin);
static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
// Returns false if name is not a command line flag.
static bool wasSetOnCmdline(const char* name, bool* value);
static void printSetFlags(outputStream* out);
static void printFlags(outputStream* out, bool withComments);
static void verify() PRODUCT_RETURN;
};
// use this for flags that are true by default in the debug version but
// false in the optimized version, and vice versa
#ifdef ASSERT
#define trueInDebug true
#define falseInDebug false
#else
#define trueInDebug false
#define falseInDebug true
#endif
// use this for flags that are true per default in the product build
// but false in development builds, and vice versa
#ifdef PRODUCT
#define trueInProduct true
#define falseInProduct false
#else
#define trueInProduct false
#define falseInProduct true
#endif
#ifdef JAVASE_EMBEDDED
#define falseInEmbedded false
#else
#define falseInEmbedded true
#endif
// develop flags are settable / visible only during development and are constant in the PRODUCT version
// product flags are always settable / visible
// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
// A flag must be declared with one of the following types:
// bool, intx, uintx, ccstr.
// The type "ccstr" is an alias for "const char*" and is used
// only in this file, because the macrology requires single-token type names.
// Note: Diagnostic options not meant for VM tuning or for product modes.
// They are to be used for VM quality assurance or field diagnosis
// of VM bugs. They are hidden so that users will not be encouraged to
// try them as if they were VM ordinary execution options. However, they
// are available in the product version of the VM. Under instruction
// from support engineers, VM customers can turn them on to collect
// diagnostic information about VM problems. To use a VM diagnostic
// option, you must first specify +UnlockDiagnosticVMOptions.
// (This master switch also affects the behavior of -Xprintflags.)
//
// experimental flags are in support of features that are not
// part of the officially supported product, but are available
// for experimenting with. They could, for example, be performance
// features that may not have undergone full or rigorous QA, but which may
// help performance in some cases and released for experimentation
// by the community of users and developers. This flag also allows one to
// be able to build a fully supported product that nonetheless also
// ships with some unsupported, lightly tested, experimental features.
// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
// UnlockExperimentalVMOptions flag, which allows the control and
// modification of the experimental flags.
//
// Nota bene: neither diagnostic nor experimental options should be used casually,
// and they are not supported on production loads, except under explicit
// direction from support engineers.
//
// manageable flags are writeable external product flags.
// They are dynamically writeable through the JDK management interface
// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
// These flags are external exported interface (see CCC). The list of
// manageable flags can be queried programmatically through the management
// interface.
//
// A flag can be made as "manageable" only if
// - the flag is defined in a CCC as an external exported interface.
// - the VM implementation supports dynamic setting of the flag.
// This implies that the VM must *always* query the flag variable
// and not reuse state related to the flag state at any given time.
// - you want the flag to be queried programmatically by the customers.
//
// product_rw flags are writeable internal product flags.
// They are like "manageable" flags but for internal/private use.
// The list of product_rw flags are internal/private flags which
// may be changed/removed in a future release. It can be set
// through the management interface to get/set value
// when the name of flag is supplied.
//
// A flag can be made as "product_rw" only if
// - the VM implementation supports dynamic setting of the flag.
// This implies that the VM must *always* query the flag variable
// and not reuse state related to the flag state at any given time.
//
// Note that when there is a need to support develop flags to be writeable,
// it can be done in the same way as product_rw.
#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
\
lp64_product(bool, UseCompressedOops, false, \
"Use 32-bit object references in 64-bit VM. " \
"lp64_product means flag is always constant in 32 bit VM") \
\
lp64_product(bool, UseCompressedClassPointers, false, \
"Use 32-bit class pointers in 64-bit VM. " \
"lp64_product means flag is always constant in 32 bit VM") \
\
notproduct(bool, CheckCompressedOops, true, \
"Generate checks in encoding/decoding code in debug VM") \
\
product_pd(uintx, HeapBaseMinAddress, \
"OS specific low limit for heap base address") \
\
diagnostic(bool, PrintCompressedOopsMode, false, \
"Print compressed oops base address and encoding mode") \
\
lp64_product(intx, ObjectAlignmentInBytes, 8, \
"Default object alignment in bytes, 8 is minimum") \
\
product(bool, AssumeMP, false, \
"Instruct the VM to assume multiple processors are available") \
\
/* UseMembar is theoretically a temp flag used for memory barrier \
* removal testing. It was supposed to be removed before FCS but has \
* been re-added (see 6401008) */ \
product_pd(bool, UseMembar, \
"(Unstable) Issues membars on thread state transitions") \
\
/* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \
* that don't support it. This will be replaced by processor detection \
* logic. \
*/ \
product(bool, UsePPCLWSYNC, true, \
"Use lwsync instruction if true, else use slower sync") \
\
develop(bool, CleanChunkPoolAsync, falseInEmbedded, \
"Clean the chunk pool asynchronously") \
\
/* Temporary: See 6948537 */ \
experimental(bool, UseMemSetInBOT, true, \
"(Unstable) uses memset in BOT updates in GC code") \
\
diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
"Enable normal processing of flags relating to field diagnostics")\
\
experimental(bool, UnlockExperimentalVMOptions, false, \
"Enable normal processing of flags relating to experimental " \
"features") \
\
product(bool, JavaMonitorsInStackTrace, true, \
"Print information about Java monitor locks when the stacks are" \
"dumped") \
\
product_pd(bool, UseLargePages, \
"Use large page memory") \
\
product_pd(bool, UseLargePagesIndividualAllocation, \
"Allocate large pages individually for better affinity") \
\
develop(bool, LargePagesIndividualAllocationInjectError, false, \
"Fail large pages individual allocation") \
\
product(bool, UseLargePagesInMetaspace, false, \
"Use large page memory in metaspace. " \
"Only used if UseLargePages is enabled.") \
\
develop(bool, TracePageSizes, false, \
"Trace page size selection and usage") \
\
product(bool, UseNUMA, false, \
"Use NUMA if available") \
\
product(bool, UseNUMAInterleaving, false, \
"Interleave memory across NUMA nodes if available") \
\
product(uintx, NUMAInterleaveGranularity, 2*M, \
"Granularity to use for NUMA interleaving on Windows OS") \
\
product(bool, ForceNUMA, false, \
"Force NUMA optimizations on single-node/UMA systems") \
\
product(uintx, NUMAChunkResizeWeight, 20, \
"Percentage (0-100) used to weigh the current sample when " \
"computing exponentially decaying average for " \
"AdaptiveNUMAChunkSizing") \
\
product(uintx, NUMASpaceResizeRate, 1*G, \
"Do not reallocate more than this amount per collection") \
\
product(bool, UseAdaptiveNUMAChunkSizing, true, \
"Enable adaptive chunk sizing for NUMA") \
\
product(bool, NUMAStats, false, \
"Print NUMA stats in detailed heap information") \
\
product(uintx, NUMAPageScanRate, 256, \
"Maximum number of pages to include in the page scan procedure") \
\
product_pd(bool, NeedsDeoptSuspend, \
"True for register window machines (sparc/ia64)") \
\
product(intx, UseSSE, 99, \
"Highest supported SSE instructions set on x86/x64") \
\
product(bool, UseAES, false, \
"Control whether AES instructions can be used on x86/x64") \
\
product(uintx, LargePageSizeInBytes, 0, \
"Large page size (0 to let VM choose the page size)") \
\
product(uintx, LargePageHeapSizeThreshold, 128*M, \
"Use large pages if maximum heap is at least this big") \
\
product(bool, ForceTimeHighResolution, false, \
"Using high time resolution (for Win32 only)") \
\
develop(bool, TraceItables, false, \
"Trace initialization and use of itables") \
\
develop(bool, TracePcPatching, false, \
"Trace usage of frame::patch_pc") \
\
develop(bool, TraceJumps, false, \
"Trace assembly jumps in thread ring buffer") \
\
develop(bool, TraceRelocator, false, \
"Trace the bytecode relocator") \
\
develop(bool, TraceLongCompiles, false, \
"Print out every time compilation is longer than " \
"a given threshold") \
\
develop(bool, SafepointALot, false, \
"Generate a lot of safepoints. This works with " \
"GuaranteedSafepointInterval") \
\
product_pd(bool, BackgroundCompilation, \
"A thread requesting compilation is not blocked during " \
"compilation") \
\
product(bool, PrintVMQWaitTime, false, \
"Print out the waiting time in VM operation queue") \
\
develop(bool, NoYieldsInMicrolock, false, \
"Disable yields in microlock") \
\
develop(bool, TraceOopMapGeneration, false, \
"Show OopMapGeneration") \
\
product(bool, MethodFlushing, true, \
"Reclamation of zombie and not-entrant methods") \
\
develop(bool, VerifyStack, false, \
"Verify stack of each thread when it is entering a runtime call") \
\
diagnostic(bool, ForceUnreachable, false, \
"Make all non code cache addresses to be unreachable by " \
"forcing use of 64bit literal fixups") \
\
notproduct(bool, StressDerivedPointers, false, \
"Force scavenge when a derived pointer is detected on stack " \
"after rtm call") \
\
develop(bool, TraceDerivedPointers, false, \
"Trace traversal of derived pointers on stack") \
\
notproduct(bool, TraceCodeBlobStacks, false, \
"Trace stack-walk of codeblobs") \
\
product(bool, PrintJNIResolving, false, \
"Used to implement -v:jni") \
\
notproduct(bool, PrintRewrites, false, \
"Print methods that are being rewritten") \
\
product(bool, UseInlineCaches, true, \
"Use Inline Caches for virtual calls ") \
\
develop(bool, InlineArrayCopy, true, \
"Inline arraycopy native that is known to be part of " \
"base library DLL") \
\
develop(bool, InlineObjectHash, true, \
"Inline Object::hashCode() native that is known to be part " \
"of base library DLL") \
\
develop(bool, InlineNatives, true, \
"Inline natives that are known to be part of base library DLL") \
\
develop(bool, InlineMathNatives, true, \
"Inline SinD, CosD, etc.") \
\
develop(bool, InlineClassNatives, true, \
"Inline Class.isInstance, etc") \
\
develop(bool, InlineThreadNatives, true, \
"Inline Thread.currentThread, etc") \
\
develop(bool, InlineUnsafeOps, true, \
"Inline memory ops (native methods) from sun.misc.Unsafe") \
\
product(bool, CriticalJNINatives, true, \
"Check for critical JNI entry points") \
\
notproduct(bool, StressCriticalJNINatives, false, \
"Exercise register saving code in critical natives") \
\
product(bool, UseSSE42Intrinsics, false, \
"SSE4.2 versions of intrinsics") \
\
product(bool, UseAESIntrinsics, false, \
"Use intrinsics for AES versions of crypto") \
\
product(bool, UseCRC32Intrinsics, false, \
"use intrinsics for java.util.zip.CRC32") \
\
develop(bool, TraceCallFixup, false, \
"Trace all call fixups") \
\
develop(bool, DeoptimizeALot, false, \
"Deoptimize at every exit from the runtime system") \
\
notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
"A comma separated list of bcis to deoptimize at") \
\
product(bool, DeoptimizeRandom, false, \
"Deoptimize random frames on random exit from the runtime system")\
\
notproduct(bool, ZombieALot, false, \
"Create zombies (non-entrant) at exit from the runtime system") \
\
product(bool, UnlinkSymbolsALot, false, \
"Unlink unreferenced symbols from the symbol table at safepoints")\
\
notproduct(bool, WalkStackALot, false, \
"Trace stack (no print) at every exit from the runtime system") \
\
product(bool, Debugging, false, \
"Set when executing debug methods in debug.cpp " \
"(to prevent triggering assertions)") \
\
notproduct(bool, StrictSafepointChecks, trueInDebug, \
"Enable strict checks that safepoints cannot happen for threads " \
"that use No_Safepoint_Verifier") \
\
notproduct(bool, VerifyLastFrame, false, \
"Verify oops on last frame on entry to VM") \
\
develop(bool, TraceHandleAllocation, false, \
"Print out warnings when suspiciously many handles are allocated")\
\
product(bool, UseCompilerSafepoints, true, \
"Stop at safepoints in compiled code") \
\
product(bool, FailOverToOldVerifier, true, \
"Fail over to old verifier when split verifier fails") \
\
develop(bool, ShowSafepointMsgs, false, \
"Show message about safepoint synchronization") \
\
product(bool, SafepointTimeout, false, \
"Time out and warn or fail after SafepointTimeoutDelay " \
"milliseconds if failed to reach safepoint") \
\
develop(bool, DieOnSafepointTimeout, false, \
"Die upon failure to reach safepoint (see SafepointTimeout)") \
\
/* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
/* typically, at most a few retries are needed */ \
product(intx, SuspendRetryCount, 50, \
"Maximum retry count for an external suspend request") \
\
product(intx, SuspendRetryDelay, 5, \
"Milliseconds to delay per retry (* current_retry_count)") \
\
product(bool, AssertOnSuspendWaitFailure, false, \
"Assert/Guarantee on external suspend wait failure") \
\
product(bool, TraceSuspendWaitFailures, false, \
"Trace external suspend wait failures") \
\
product(bool, MaxFDLimit, true, \
"Bump the number of file descriptors to maximum in Solaris") \
\
diagnostic(bool, LogEvents, true, \
"Enable the various ring buffer event logs") \
\
diagnostic(uintx, LogEventsBufferEntries, 10, \
"Number of ring buffer event logs") \
\
product(bool, BytecodeVerificationRemote, true, \
"Enable the Java bytecode verifier for remote classes") \
\
product(bool, BytecodeVerificationLocal, false, \
"Enable the Java bytecode verifier for local classes") \
\
develop(bool, ForceFloatExceptions, trueInDebug, \
"Force exceptions on FP stack under/overflow") \
\
develop(bool, VerifyStackAtCalls, false, \
"Verify that the stack pointer is unchanged after calls") \
\
develop(bool, TraceJavaAssertions, false, \
"Trace java language assertions") \
\
notproduct(bool, CheckAssertionStatusDirectives, false, \
"Temporary - see javaClasses.cpp") \
\
notproduct(bool, PrintMallocFree, false, \
"Trace calls to C heap malloc/free allocation") \
\
product(bool, PrintOopAddress, false, \
"Always print the location of the oop") \
\
notproduct(bool, VerifyCodeCacheOften, false, \
"Verify compiled-code cache often") \
\
develop(bool, ZapDeadCompiledLocals, false, \
"Zap dead locals in compiler frames") \
\
notproduct(bool, ZapDeadLocalsOld, false, \
"Zap dead locals (old version, zaps all frames when " \
"entering the VM") \
\
notproduct(bool, CheckOopishValues, false, \
"Warn if value contains oop (requires ZapDeadLocals)") \
\
develop(bool, UseMallocOnly, false, \
"Use only malloc/free for allocation (no resource area/arena)") \
\
develop(bool, PrintMalloc, false, \
"Print all malloc/free calls") \
\
develop(bool, PrintMallocStatistics, false, \
"Print malloc/free statistics") \
\
develop(bool, ZapResourceArea, trueInDebug, \
"Zap freed resource/arena space with 0xABABABAB") \
\
notproduct(bool, ZapVMHandleArea, trueInDebug, \
"Zap freed VM handle space with 0xBCBCBCBC") \
\
develop(bool, ZapJNIHandleArea, trueInDebug, \
"Zap freed JNI handle space with 0xFEFEFEFE") \
\
notproduct(bool, ZapStackSegments, trueInDebug, \
"Zap allocated/freed stack segments with 0xFADFADED") \
\
develop(bool, ZapUnusedHeapArea, trueInDebug, \
"Zap unused heap space with 0xBAADBABE") \
\
develop(bool, TraceZapUnusedHeapArea, false, \
"Trace zapping of unused heap space") \
\
develop(bool, CheckZapUnusedHeapArea, false, \
"Check zapping of unused heap space") \
\
develop(bool, ZapFillerObjects, trueInDebug, \
"Zap filler objects with 0xDEAFBABE") \
\
develop(bool, PrintVMMessages, true, \
"Print VM messages on console") \
\
product(bool, PrintGCApplicationConcurrentTime, false, \
"Print the time the application has been running") \
\
product(bool, PrintGCApplicationStoppedTime, false, \
"Print the time the application has been stopped") \
\
diagnostic(bool, VerboseVerification, false, \
"Display detailed verification details") \
\
notproduct(uintx, ErrorHandlerTest, 0, \
"If > 0, provokes an error after VM initialization; the value " \
"determines which error to provoke. See test_error_handler() " \
"in debug.cpp.") \
\
develop(bool, Verbose, false, \
"Print additional debugging information from other modes") \
\
develop(bool, PrintMiscellaneous, false, \
"Print uncategorized debugging information (requires +Verbose)") \
\
develop(bool, WizardMode, false, \
"Print much more debugging information") \
\
product(bool, ShowMessageBoxOnError, false, \
"Keep process alive on VM fatal error") \
\
product(bool, CreateMinidumpOnCrash, false, \
"Create minidump on VM fatal error") \
\
product_pd(bool, UseOSErrorReporting, \
"Let VM fatal error propagate to the OS (ie. WER on Windows)") \
\
product(bool, SuppressFatalErrorMessage, false, \
"Report NO fatal error message (avoid deadlock)") \
\
product(ccstrlist, OnError, "", \
"Run user-defined commands on fatal error; see VMError.cpp " \
"for examples") \
\
product(ccstrlist, OnOutOfMemoryError, "", \
"Run user-defined commands on first java.lang.OutOfMemoryError") \
\
manageable(bool, HeapDumpBeforeFullGC, false, \
"Dump heap to file before any major stop-the-world GC") \
\
manageable(bool, HeapDumpAfterFullGC, false, \
"Dump heap to file after any major stop-the-world GC") \
\
manageable(bool, HeapDumpOnOutOfMemoryError, false, \
"Dump heap to file when java.lang.OutOfMemoryError is thrown") \
\
manageable(ccstr, HeapDumpPath, NULL, \
"When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
"directory) of the dump file (defaults to java_pid<pid>.hprof " \
"in the working directory)") \
\
develop(uintx, SegmentedHeapDumpThreshold, 2*G, \
"Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \
"when the heap usage is larger than this") \
\
develop(uintx, HeapDumpSegmentSize, 1*G, \
"Approximate segment size when generating a segmented heap dump") \
\
develop(bool, BreakAtWarning, false, \
"Execute breakpoint upon encountering VM warning") \
\
develop(bool, TraceVMOperation, false, \
"Trace VM operations") \
\
develop(bool, UseFakeTimers, false, \
"Tell whether the VM should use system time or a fake timer") \
\
product(ccstr, NativeMemoryTracking, "off", \
"Native memory tracking options") \
\
diagnostic(bool, PrintNMTStatistics, false, \
"Print native memory tracking summary data if it is on") \
\
diagnostic(bool, AutoShutdownNMT, true, \
"Automatically shutdown native memory tracking under stress " \
"situations. When set to false, native memory tracking tries to " \
"stay alive at the expense of JVM performance") \
\
diagnostic(bool, LogCompilation, false, \
"Log compilation activity in detail to LogFile") \
\
product(bool, PrintCompilation, false, \
"Print compilations") \
\
diagnostic(bool, TraceNMethodInstalls, false, \
"Trace nmethod installation") \
\
diagnostic(intx, ScavengeRootsInCode, 2, \
"0: do not allow scavengable oops in the code cache; " \
"1: allow scavenging from the code cache; " \
"2: emit as many constants as the compiler can see") \
\
product(bool, AlwaysRestoreFPU, false, \
"Restore the FPU control word after every JNI call (expensive)") \
\
diagnostic(bool, PrintCompilation2, false, \
"Print additional statistics per compilation") \
\
diagnostic(bool, PrintAdapterHandlers, false, \
"Print code generated for i2c/c2i adapters") \
\
diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
"Verify that i2c/c2i adapters are called properly") \
\
develop(bool, VerifyAdapterSharing, false, \
"Verify that the code for shared adapters is the equivalent") \
\
diagnostic(bool, PrintAssembly, false, \
"Print assembly code (using external disassembler.so)") \
\
diagnostic(ccstr, PrintAssemblyOptions, NULL, \
"Print options string passed to disassembler.so") \
\
diagnostic(bool, PrintNMethods, false, \
"Print assembly code for nmethods when generated") \
\
diagnostic(bool, PrintNativeNMethods, false, \
"Print assembly code for native nmethods when generated") \
\
develop(bool, PrintDebugInfo, false, \
"Print debug information for all nmethods when generated") \
\
develop(bool, PrintRelocations, false, \
"Print relocation information for all nmethods when generated") \
\
develop(bool, PrintDependencies, false, \
"Print dependency information for all nmethods when generated") \
\
develop(bool, PrintExceptionHandlers, false, \
"Print exception handler tables for all nmethods when generated") \
\
develop(bool, StressCompiledExceptionHandlers, false, \
"Exercise compiled exception handlers") \
\
develop(bool, InterceptOSException, false, \
"Start debugger when an implicit OS (e.g. NULL) " \
"exception happens") \
\
product(bool, PrintCodeCache, false, \
"Print the code cache memory usage when exiting") \
\
develop(bool, PrintCodeCache2, false, \
"Print detailed usage information on the code cache when exiting")\
\
product(bool, PrintCodeCacheOnCompilation, false, \
"Print the code cache memory usage each time a method is " \
"compiled") \
\
diagnostic(bool, PrintStubCode, false, \
"Print generated stub code") \
\
product(bool, StackTraceInThrowable, true, \
"Collect backtrace in throwable when exception happens") \
\
product(bool, OmitStackTraceInFastThrow, true, \
"Omit backtraces for some 'hot' exceptions in optimized code") \
\
product(bool, ProfilerPrintByteCodeStatistics, false, \
"Print bytecode statistics when dumping profiler output") \
\
product(bool, ProfilerRecordPC, false, \
"Collect ticks for each 16 byte interval of compiled code") \
\
product(bool, ProfileVM, false, \
"Profile ticks that fall within VM (either in the VM Thread " \
"or VM code called through stubs)") \
\
product(bool, ProfileIntervals, false, \
"Print profiles for each interval (see ProfileIntervalsTicks)") \
\
notproduct(bool, ProfilerCheckIntervals, false, \
"Collect and print information on spacing of profiler ticks") \
\
develop(bool, PrintJVMWarnings, false, \
"Print warnings for unimplemented JVM functions") \
\
product(bool, PrintWarnings, true, \
"Print JVM warnings to output stream") \
\
notproduct(uintx, WarnOnStalledSpinLock, 0, \
"Print warnings for stalled SpinLocks") \
\
product(bool, RegisterFinalizersAtInit, true, \
"Register finalizable objects at end of Object.<init> or " \
"after allocation") \
\
develop(bool, RegisterReferences, true, \
"Tell whether the VM should register soft/weak/final/phantom " \
"references") \
\
develop(bool, IgnoreRewrites, false, \
"Suppress rewrites of bytecodes in the oopmap generator. " \
"This is unsafe!") \
\
develop(bool, PrintCodeCacheExtension, false, \
"Print extension of code cache") \
\
develop(bool, UsePrivilegedStack, true, \
"Enable the security JVM functions") \
\
develop(bool, ProtectionDomainVerification, true, \
"Verify protection domain before resolution in system dictionary")\
\
product(bool, ClassUnloading, true, \
"Do unloading of classes") \
\
develop(bool, DisableStartThread, false, \
"Disable starting of additional Java threads " \
"(for debugging only)") \
\
develop(bool, MemProfiling, false, \
"Write memory usage profiling to log file") \
\
notproduct(bool, PrintSystemDictionaryAtExit, false, \
"Print the system dictionary at exit") \
\
experimental(intx, PredictedLoadedClassCount, 0, \
"Experimental: Tune loaded class cache starting size") \
\
diagnostic(bool, UnsyncloadClass, false, \
"Unstable: VM calls loadClass unsynchronized. Custom " \
"class loader must call VM synchronized for findClass " \
"and defineClass.") \
\
product(bool, AlwaysLockClassLoader, false, \
"Require the VM to acquire the class loader lock before calling " \
"loadClass() even for class loaders registering " \
"as parallel capable") \
\
product(bool, AllowParallelDefineClass, false, \
"Allow parallel defineClass requests for class loaders " \
"registering as parallel capable") \
\
product(bool, MustCallLoadClassInternal, false, \
"Call loadClassInternal() rather than loadClass()") \
\
product_pd(bool, DontYieldALot, \
"Throw away obvious excess yield calls (for Solaris only)") \
\
product_pd(bool, ConvertSleepToYield, \
"Convert sleep(0) to thread yield " \
"(may be off for Solaris to improve GUI)") \
\
product(bool, ConvertYieldToSleep, false, \
"Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
"behavior (Solaris only)") \
\
product(bool, UseBoundThreads, true, \
"Bind user level threads to kernel threads (for Solaris only)") \
\
develop(bool, UseDetachedThreads, true, \
"Use detached threads that are recycled upon termination " \
"(for Solaris only)") \
\
product(bool, UseLWPSynchronization, true, \
"Use LWP-based instead of libthread-based synchronization " \
"(SPARC only)") \
\
product(ccstr, SyncKnobs, NULL, \
"(Unstable) Various monitor synchronization tunables") \
\
product(intx, EmitSync, 0, \
"(Unsafe, Unstable) " \
"Control emission of inline sync fast-path code") \
\
product(intx, MonitorBound, 0, "Bound Monitor population") \
\
product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \
\
product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
\
product(intx, SyncVerbose, 0, "(Unstable)") \
\
product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \
\
product(intx, hashCode, 5, \
"(Unstable) select hashCode generation algorithm") \
\
product(intx, WorkAroundNPTLTimedWaitHang, 1, \
"(Unstable, Linux-specific) " \
"avoid NPTL-FUTEX hang pthread_cond_timedwait") \
\
product(bool, FilterSpuriousWakeups, true, \
"Prevent spurious or premature wakeups from object.wait " \
"(Solaris only)") \
\
product(intx, NativeMonitorTimeout, -1, "(Unstable)") \
\
product(intx, NativeMonitorFlags, 0, "(Unstable)") \
\
product(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \
\
develop(bool, UsePthreads, false, \
"Use pthread-based instead of libthread-based synchronization " \
"(SPARC only)") \
\
product(bool, AdjustConcurrency, false, \
"Call thr_setconcurrency at thread creation time to avoid " \
"LWP starvation on MP systems (for Solaris Only)") \
\
product(bool, ReduceSignalUsage, false, \
"Reduce the use of OS signals in Java and/or the VM") \
\
develop_pd(bool, ShareVtableStubs, \
"Share vtable stubs (smaller code but worse branch prediction") \
\
develop(bool, LoadLineNumberTables, true, \
"Tell whether the class file parser loads line number tables") \
\
develop(bool, LoadLocalVariableTables, true, \
"Tell whether the class file parser loads local variable tables") \
\
develop(bool, LoadLocalVariableTypeTables, true, \
"Tell whether the class file parser loads local variable type" \
"tables") \
\
product(bool, AllowUserSignalHandlers, false, \
"Do not complain if the application installs signal handlers " \
"(Solaris & Linux only)") \
\
product(bool, UseSignalChaining, true, \
"Use signal-chaining to invoke signal handlers installed " \
"by the application (Solaris & Linux only)") \
\
product(bool, UseAltSigs, false, \
"Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \
"internal signals (Solaris only)") \
\
product(bool, AllowJNIEnvProxy, false, \
"Allow JNIEnv proxies for jdbx") \
\
product(bool, JNIDetachReleasesMonitors, true, \
"JNI DetachCurrentThread releases monitors owned by thread") \
\
product(bool, RestoreMXCSROnJNICalls, false, \
"Restore MXCSR when returning from JNI calls") \
\
product(bool, CheckJNICalls, false, \
"Verify all arguments to JNI calls") \
\
product(bool, UseFastJNIAccessors, true, \
"Use optimized versions of Get<Primitive>Field") \
\
product(bool, EagerXrunInit, false, \
"Eagerly initialize -Xrun libraries; allows startup profiling, " \
"but not all -Xrun libraries may support the state of the VM " \
"at this time") \
\
product(bool, PreserveAllAnnotations, false, \
"Preserve RuntimeInvisibleAnnotations as well " \
"as RuntimeVisibleAnnotations") \
\
develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
"Number of OutOfMemoryErrors preallocated with backtrace") \
\
product(bool, LazyBootClassLoader, true, \
"Enable/disable lazy opening of boot class path entries") \
\
product(bool, UseXMMForArrayCopy, false, \
"Use SSE2 MOVQ instruction for Arraycopy") \
\
product(intx, FieldsAllocationStyle, 1, \
"0 - type based with oops first, 1 - with oops last, " \
"2 - oops in super and sub classes are together") \
\
product(bool, CompactFields, true, \
"Allocate nonstatic fields in gaps between previous fields") \
\
notproduct(bool, PrintFieldLayout, false, \
"Print field layout for each class") \
\
product(intx, ContendedPaddingWidth, 128, \
"How many bytes to pad the fields/classes marked @Contended with")\
\
product(bool, EnableContended, true, \
"Enable @Contended annotation support") \
\
product(bool, RestrictContended, true, \
"Restrict @Contended to trusted classes") \
\
product(bool, UseBiasedLocking, true, \
"Enable biased locking in JVM") \
\
product(intx, BiasedLockingStartupDelay, 4000, \
"Number of milliseconds to wait before enabling biased locking") \
\
diagnostic(bool, PrintBiasedLockingStatistics, false, \
"Print statistics of biased locking in JVM") \
\
product(intx, BiasedLockingBulkRebiasThreshold, 20, \
"Threshold of number of revocations per type to try to " \
"rebias all objects in the heap of that type") \
\
product(intx, BiasedLockingBulkRevokeThreshold, 40, \
"Threshold of number of revocations per type to permanently " \
"revoke biases of all objects in the heap of that type") \
\
product(intx, BiasedLockingDecayTime, 25000, \
"Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
"type after previous bulk rebias") \
\
/* tracing */ \
\
notproduct(bool, TraceRuntimeCalls, false, \
"Trace run-time calls") \
\
develop(bool, TraceJNICalls, false, \
"Trace JNI calls") \
\
notproduct(bool, TraceJVMCalls, false, \
"Trace JVM calls") \
\
product(ccstr, TraceJVMTI, NULL, \
"Trace flags for JVMTI functions and events") \
\
/* This option can change an EMCP method into an obsolete method. */ \
/* This can affect tests that except specific methods to be EMCP. */ \
/* This option should be used with caution. */ \
product(bool, StressLdcRewrite, false, \
"Force ldc -> ldc_w rewrite during RedefineClasses") \
\
product(intx, TraceRedefineClasses, 0, \
"Trace level for JVMTI RedefineClasses") \
\
develop(bool, StressMethodComparator, false, \
"Run the MethodComparator on all loaded methods") \
\
/* change to false by default sometime after Mustang */ \
product(bool, VerifyMergedCPBytecodes, true, \
"Verify bytecodes after RedefineClasses constant pool merging") \
\
develop(bool, TraceJNIHandleAllocation, false, \
"Trace allocation/deallocation of JNI handle blocks") \
\
develop(bool, TraceThreadEvents, false, \
"Trace all thread events") \
\
develop(bool, TraceBytecodes, false, \
"Trace bytecode execution") \
\
develop(bool, TraceClassInitialization, false, \
"Trace class initialization") \
\
develop(bool, TraceExceptions, false, \
"Trace exceptions") \
\
develop(bool, TraceICs, false, \
"Trace inline cache changes") \
\
notproduct(bool, TraceInvocationCounterOverflow, false, \
"Trace method invocation counter overflow") \
\
develop(bool, TraceInlineCacheClearing, false, \
"Trace clearing of inline caches in nmethods") \
\
develop(bool, TraceDependencies, false, \
"Trace dependencies") \
\
develop(bool, VerifyDependencies, trueInDebug, \
"Exercise and verify the compilation dependency mechanism") \
\
develop(bool, TraceNewOopMapGeneration, false, \
"Trace OopMapGeneration") \
\
develop(bool, TraceNewOopMapGenerationDetailed, false, \
"Trace OopMapGeneration: print detailed cell states") \
\
develop(bool, TimeOopMap, false, \
"Time calls to GenerateOopMap::compute_map() in sum") \
\
develop(bool, TimeOopMap2, false, \
"Time calls to GenerateOopMap::compute_map() individually") \
\
develop(bool, TraceMonitorMismatch, false, \
"Trace monitor matching failures during OopMapGeneration") \
\
develop(bool, TraceOopMapRewrites, false, \
"Trace rewriting of method oops during oop map generation") \
\
develop(bool, TraceSafepoint, false, \
"Trace safepoint operations") \
\
develop(bool, TraceICBuffer, false, \
"Trace usage of IC buffer") \
\
develop(bool, TraceCompiledIC, false, \
"Trace changes of compiled IC") \
\
notproduct(bool, TraceZapDeadLocals, false, \
"Trace zapping dead locals") \
\
develop(bool, TraceStartupTime, false, \
"Trace setup time") \
\
develop(bool, TraceProtectionDomainVerification, false, \
"Trace protection domain verification") \
\
develop(bool, TraceClearedExceptions, false, \
"Print when an exception is forcibly cleared") \
\
product(bool, TraceClassResolution, false, \
"Trace all constant pool resolutions (for debugging)") \
\
product(bool, TraceBiasedLocking, false, \
"Trace biased locking in JVM") \
\
product(bool, TraceMonitorInflation, false, \
"Trace monitor inflation in JVM") \
\
/* gc */ \
\
product(bool, UseSerialGC, false, \
"Use the Serial garbage collector") \
\
product(bool, UseG1GC, false, \
"Use the Garbage-First garbage collector") \
\
product(bool, UseParallelGC, false, \
"Use the Parallel Scavenge garbage collector") \
\
product(bool, UseParallelOldGC, false, \
"Use the Parallel Old garbage collector") \
\
product(uintx, HeapMaximumCompactionInterval, 20, \
"How often should we maximally compact the heap (not allowing " \
"any dead space)") \
\
product(uintx, HeapFirstMaximumCompactionCount, 3, \
"The collection count for the first maximum compaction") \
\
product(bool, UseMaximumCompactionOnSystemGC, true, \
"Use maximum compaction in the Parallel Old garbage collector " \
"for a system GC") \
\
product(uintx, ParallelOldDeadWoodLimiterMean, 50, \
"The mean used by the parallel compact dead wood " \
"limiter (a number between 0-100)") \
\
product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \
"The standard deviation used by the parallel compact dead wood " \
"limiter (a number between 0-100)") \
\
product(uintx, ParallelGCThreads, 0, \
"Number of parallel threads parallel gc will use") \
\
product(bool, UseDynamicNumberOfGCThreads, false, \
"Dynamically choose the number of parallel threads " \
"parallel gc will use") \
\
diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \
"Force dynamic selection of the number of " \
"parallel threads parallel gc will use to aid debugging") \
\
product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \
"Size of heap (bytes) per GC thread used in calculating the " \
"number of GC threads") \
\
product(bool, TraceDynamicGCThreads, false, \
"Trace the dynamic GC thread usage") \
\
develop(bool, ParallelOldGCSplitALot, false, \
"Provoke splitting (copying data from a young gen space to " \
"multiple destination spaces)") \
\
develop(uintx, ParallelOldGCSplitInterval, 3, \
"How often to provoke splitting a young gen space") \
\
product(uintx, ConcGCThreads, 0, \
"Number of threads concurrent gc will use") \
\
product(uintx, YoungPLABSize, 4096, \
"Size of young gen promotion LAB's (in HeapWords)") \
\
product(uintx, OldPLABSize, 1024, \
"Size of old gen promotion LAB's (in HeapWords)") \
\
product(uintx, GCTaskTimeStampEntries, 200, \
"Number of time stamp entries per gc worker thread") \
\
product(bool, AlwaysTenure, false, \
"Always tenure objects in eden (ParallelGC only)") \
\
product(bool, NeverTenure, false, \
"Never tenure objects in eden, may tenure on overflow " \
"(ParallelGC only)") \
\
product(bool, ScavengeBeforeFullGC, true, \
"Scavenge youngest generation before each full GC, " \
"used with UseParallelGC") \
\
develop(bool, ScavengeWithObjectsInToSpace, false, \
"Allow scavenges to occur when to-space contains objects") \
\
product(bool, UseConcMarkSweepGC, false, \
"Use Concurrent Mark-Sweep GC in the old generation") \
\
product(bool, ExplicitGCInvokesConcurrent, false, \
"A System.gc() request invokes a concurrent collection; " \
"(effective only when UseConcMarkSweepGC)") \
\
product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \
"A System.gc() request invokes a concurrent collection and " \
"also unloads classes during such a concurrent gc cycle " \
"(effective only when UseConcMarkSweepGC)") \
\
product(bool, GCLockerInvokesConcurrent, false, \
"The exit of a JNI critical section necessitating a scavenge, " \
"also kicks off a background concurrent collection") \
\
product(uintx, GCLockerEdenExpansionPercent, 5, \
"How much the GC can expand the eden by while the GC locker " \
"is active (as a percentage)") \
\
diagnostic(intx, GCLockerRetryAllocationCount, 2, \
"Number of times to retry allocations when " \
"blocked by the GC locker") \
\
develop(bool, UseCMSAdaptiveFreeLists, true, \
"Use adaptive free lists in the CMS generation") \
\
develop(bool, UseAsyncConcMarkSweepGC, true, \
"Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
\
develop(bool, RotateCMSCollectionTypes, false, \
"Rotate the CMS collections among concurrent and STW") \
\
product(bool, UseCMSBestFit, true, \
"Use CMS best fit allocation strategy") \
\
product(bool, UseCMSCollectionPassing, true, \
"Use passing of collection from background to foreground") \
\
product(bool, UseParNewGC, false, \
"Use parallel threads in the new generation") \
\
product(bool, ParallelGCVerbose, false, \
"Verbose output for parallel gc") \
\
product(uintx, ParallelGCBufferWastePct, 10, \
"Wasted fraction of parallel allocation buffer") \
\
diagnostic(bool, ParallelGCRetainPLAB, false, \
"Retain parallel allocation buffers across scavenges; " \
"it is disabled because this currently conflicts with " \
"parallel card scanning under certain conditions.") \
\
product(uintx, TargetPLABWastePct, 10, \
"Target wasted space in last buffer as percent of overall " \
"allocation") \
\
product(uintx, PLABWeight, 75, \
"Percentage (0-100) used to weigh the current sample when " \
"computing exponentially decaying average for ResizePLAB") \
\
product(bool, ResizePLAB, true, \
"Dynamically resize (survivor space) promotion LAB's") \
\
product(bool, PrintPLAB, false, \
"Print (survivor space) promotion LAB's sizing decisions") \
\
product(intx, ParGCArrayScanChunk, 50, \
"Scan a subset of object array and push remainder, if array is " \
"bigger than this") \
\
product(bool, ParGCUseLocalOverflow, false, \
"Instead of a global overflow list, use local overflow stacks") \
\
product(bool, ParGCTrimOverflow, true, \
"Eagerly trim the local overflow lists " \
"(when ParGCUseLocalOverflow)") \
\
notproduct(bool, ParGCWorkQueueOverflowALot, false, \
"Simulate work queue overflow in ParNew") \
\
notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \
"An `interval' counter that determines how frequently " \
"we simulate overflow; a smaller number increases frequency") \
\
product(uintx, ParGCDesiredObjsFromOverflowList, 20, \
"The desired number of objects to claim from the overflow list") \
\
diagnostic(uintx, ParGCStridesPerThread, 2, \
"The number of strides per worker thread that we divide up the " \
"card table scanning work into") \
\
diagnostic(intx, ParGCCardsPerStrideChunk, 256, \
"The number of cards in each chunk of the parallel chunks used " \
"during card table scanning") \
\
product(uintx, CMSParPromoteBlocksToClaim, 16, \
"Number of blocks to attempt to claim when refilling CMS LAB's " \
"for parallel GC") \
\
product(uintx, OldPLABWeight, 50, \
"Percentage (0-100) used to weight the current sample when " \
"computing exponentially decaying average for resizing " \
"CMSParPromoteBlocksToClaim") \
\
product(bool, ResizeOldPLAB, true, \
"Dynamically resize (old gen) promotion LAB's") \
\
product(bool, PrintOldPLAB, false, \
"Print (old gen) promotion LAB's sizing decisions") \
\
product(uintx, CMSOldPLABMin, 16, \
"Minimum size of CMS gen promotion LAB caches per worker " \
"per block size") \
\
product(uintx, CMSOldPLABMax, 1024, \
"Maximum size of CMS gen promotion LAB caches per worker " \
"per block size") \
\
product(uintx, CMSOldPLABNumRefills, 4, \
"Nominal number of refills of CMS gen promotion LAB cache " \
"per worker per block size") \
\
product(bool, CMSOldPLABResizeQuicker, false, \
"React on-the-fly during a scavenge to a sudden " \
"change in block demand rate") \
\
product(uintx, CMSOldPLABToleranceFactor, 4, \
"The tolerance of the phase-change detector for on-the-fly " \
"PLAB resizing during a scavenge") \
\
product(uintx, CMSOldPLABReactivityFactor, 2, \
"The gain in the feedback loop for on-the-fly PLAB resizing " \
"during a scavenge") \
\
product(bool, AlwaysPreTouch, false, \
"Force all freshly committed pages to be pre-touched") \
\
product_pd(uintx, CMSYoungGenPerWorker, \
"The maximum size of young gen chosen by default per GC worker " \
"thread available") \
\
product(bool, CMSIncrementalMode, false, \
"Whether CMS GC should operate in \"incremental\" mode") \
\
product(uintx, CMSIncrementalDutyCycle, 10, \
"Percentage (0-100) of CMS incremental mode duty cycle. If " \
"CMSIncrementalPacing is enabled, then this is just the initial " \
"value.") \
\
product(bool, CMSIncrementalPacing, true, \
"Whether the CMS incremental mode duty cycle should be " \
"automatically adjusted") \
\
product(uintx, CMSIncrementalDutyCycleMin, 0, \
"Minimum percentage (0-100) of the CMS incremental duty cycle " \
"used when CMSIncrementalPacing is enabled") \
\
product(uintx, CMSIncrementalSafetyFactor, 10, \
"Percentage (0-100) used to add conservatism when computing the " \
"duty cycle") \
\
product(uintx, CMSIncrementalOffset, 0, \
"Percentage (0-100) by which the CMS incremental mode duty cycle "\
"is shifted to the right within the period between young GCs") \
\
product(uintx, CMSExpAvgFactor, 50, \
"Percentage (0-100) used to weigh the current sample when " \
"computing exponential averages for CMS statistics") \
\
product(uintx, CMS_FLSWeight, 75, \
"Percentage (0-100) used to weigh the current sample when " \
"computing exponentially decaying averages for CMS FLS " \
"statistics") \
\
product(uintx, CMS_FLSPadding, 1, \
"The multiple of deviation from mean to use for buffering " \
"against volatility in free list demand") \
\
product(uintx, FLSCoalescePolicy, 2, \
"CMS: aggressiveness level for coalescing, increasing " \
"from 0 to 4") \
\
product(bool, FLSAlwaysCoalesceLarge, false, \
"CMS: larger free blocks are always available for coalescing") \
\
product(double, FLSLargestBlockCoalesceProximity, 0.99, \
"CMS: the smaller the percentage the greater the coalescing " \
"force") \
\
product(double, CMSSmallCoalSurplusPercent, 1.05, \
"CMS: the factor by which to inflate estimated demand of small " \
"block sizes to prevent coalescing with an adjoining block") \
\
product(double, CMSLargeCoalSurplusPercent, 0.95, \
"CMS: the factor by which to inflate estimated demand of large " \
"block sizes to prevent coalescing with an adjoining block") \
\
product(double, CMSSmallSplitSurplusPercent, 1.10, \
"CMS: the factor by which to inflate estimated demand of small " \
"block sizes to prevent splitting to supply demand for smaller " \
"blocks") \
\
product(double, CMSLargeSplitSurplusPercent, 1.00, \
"CMS: the factor by which to inflate estimated demand of large " \
"block sizes to prevent splitting to supply demand for smaller " \
"blocks") \
\
product(bool, CMSExtrapolateSweep, false, \
"CMS: cushion for block demand during sweep") \
\
product(uintx, CMS_SweepWeight, 75, \
"Percentage (0-100) used to weight the current sample when " \
"computing exponentially decaying average for inter-sweep " \
"duration") \
\
product(uintx, CMS_SweepPadding, 1, \
"The multiple of deviation from mean to use for buffering " \
"against volatility in inter-sweep duration") \
\
product(uintx, CMS_SweepTimerThresholdMillis, 10, \
"Skip block flux-rate sampling for an epoch unless inter-sweep " \
"duration exceeds this threshold in milliseconds") \
\
develop(bool, CMSTraceIncrementalMode, false, \
"Trace CMS incremental mode") \
\
develop(bool, CMSTraceIncrementalPacing, false, \
"Trace CMS incremental mode pacing computation") \
\
develop(bool, CMSTraceThreadState, false, \
"Trace the CMS thread state (enable the trace_state() method)") \
\
product(bool, CMSClassUnloadingEnabled, true, \
"Whether class unloading enabled when using CMS GC") \
\
product(uintx, CMSClassUnloadingMaxInterval, 0, \
"When CMS class unloading is enabled, the maximum CMS cycle " \
"count for which classes may not be unloaded") \
\
product(bool, CMSCompactWhenClearAllSoftRefs, true, \
"Compact when asked to collect CMS gen with " \
"clear_all_soft_refs()") \
\
product(bool, UseCMSCompactAtFullCollection, true, \
"Use Mark-Sweep-Compact algorithm at full collections") \
\
product(uintx, CMSFullGCsBeforeCompaction, 0, \
"Number of CMS full collection done before compaction if > 0") \
\
develop(intx, CMSDictionaryChoice, 0, \
"Use BinaryTreeDictionary as default in the CMS generation") \
\
product(uintx, CMSIndexedFreeListReplenish, 4, \
"Replenish an indexed free list with this number of chunks") \
\
product(bool, CMSReplenishIntermediate, true, \
"Replenish all intermediate free-list caches") \
\
product(bool, CMSSplitIndexedFreeListBlocks, true, \
"When satisfying batched demand, split blocks from the " \
"IndexedFreeList whose size is a multiple of requested size") \
\
product(bool, CMSLoopWarn, false, \
"Warn in case of excessive CMS looping") \
\
develop(bool, CMSOverflowEarlyRestoration, false, \
"Restore preserved marks early") \
\
product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \
"Size of marking stack") \
\
product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \
"Maximum size of marking stack") \
\
notproduct(bool, CMSMarkStackOverflowALot, false, \
"Simulate frequent marking stack / work queue overflow") \
\
notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \
"An \"interval\" counter that determines how frequently " \
"to simulate overflow; a smaller number increases frequency") \
\
product(uintx, CMSMaxAbortablePrecleanLoops, 0, \
"(Temporary, subject to experimentation) " \
"Maximum number of abortable preclean iterations, if > 0") \
\
product(intx, CMSMaxAbortablePrecleanTime, 5000, \
"(Temporary, subject to experimentation) " \
"Maximum time in abortable preclean (in milliseconds)") \
\
product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \
"(Temporary, subject to experimentation) " \
"Nominal minimum work per abortable preclean iteration") \
\
manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \
"(Temporary, subject to experimentation) " \
"Time that we sleep between iterations when not given " \
"enough work per iteration") \
\
product(uintx, CMSRescanMultiple, 32, \
"Size (in cards) of CMS parallel rescan task") \
\
product(uintx, CMSConcMarkMultiple, 32, \
"Size (in cards) of CMS concurrent MT marking task") \
\
product(bool, CMSAbortSemantics, false, \
"Whether abort-on-overflow semantics is implemented") \
\
product(bool, CMSParallelInitialMarkEnabled, true, \
"Use the parallel initial mark.") \
\
product(bool, CMSParallelRemarkEnabled, true, \
"Whether parallel remark enabled (only if ParNewGC)") \
\
product(bool, CMSParallelSurvivorRemarkEnabled, true, \
"Whether parallel remark of survivor space " \
"enabled (effective only if CMSParallelRemarkEnabled)") \
\
product(bool, CMSPLABRecordAlways, true, \
"Always record survivor space PLAB boundaries (effective only " \
"if CMSParallelSurvivorRemarkEnabled)") \
\
product(bool, CMSEdenChunksRecordAlways, true, \
"Always record eden chunks used for the parallel initial mark " \
"or remark of eden") \
\
product(bool, CMSPrintEdenSurvivorChunks, false, \
"Print the eden and the survivor chunks used for the parallel " \
"initial mark or remark of the eden/survivor spaces") \
\
product(bool, CMSConcurrentMTEnabled, true, \
"Whether multi-threaded concurrent work enabled " \
"(effective only if ParNewGC)") \
\
product(bool, CMSPrecleaningEnabled, true, \
"Whether concurrent precleaning enabled") \
\
product(uintx, CMSPrecleanIter, 3, \
"Maximum number of precleaning iteration passes") \
\
product(uintx, CMSPrecleanNumerator, 2, \
"CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
"ratio") \
\
product(uintx, CMSPrecleanDenominator, 3, \
"CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
"ratio") \
\
product(bool, CMSPrecleanRefLists1, true, \
"Preclean ref lists during (initial) preclean phase") \
\
product(bool, CMSPrecleanRefLists2, false, \
"Preclean ref lists during abortable preclean phase") \
\
product(bool, CMSPrecleanSurvivors1, false, \
"Preclean survivors during (initial) preclean phase") \
\
product(bool, CMSPrecleanSurvivors2, true, \
"Preclean survivors during abortable preclean phase") \
\
product(uintx, CMSPrecleanThreshold, 1000, \
"Do not iterate again if number of dirty cards is less than this")\
\
product(bool, CMSCleanOnEnter, true, \
"Clean-on-enter optimization for reducing number of dirty cards") \
\
product(uintx, CMSRemarkVerifyVariant, 1, \
"Choose variant (1,2) of verification following remark") \
\
product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \
"If Eden size is below this, do not try to schedule remark") \
\
product(uintx, CMSScheduleRemarkEdenPenetration, 50, \
"The Eden occupancy percentage (0-100) at which " \
"to try and schedule remark pause") \
\
product(uintx, CMSScheduleRemarkSamplingRatio, 5, \
"Start sampling eden top at least before young gen " \
"occupancy reaches 1/<ratio> of the size at which " \
"we plan to schedule remark") \
\
product(uintx, CMSSamplingGrain, 16*K, \
"The minimum distance between eden samples for CMS (see above)") \
\
product(bool, CMSScavengeBeforeRemark, false, \
"Attempt scavenge before the CMS remark step") \
\
develop(bool, CMSTraceSweeper, false, \
"Trace some actions of the CMS sweeper") \
\
product(uintx, CMSWorkQueueDrainThreshold, 10, \
"Don't drain below this size per parallel worker/thief") \
\
manageable(intx, CMSWaitDuration, 2000, \
"Time in milliseconds that CMS thread waits for young GC") \
\
develop(uintx, CMSCheckInterval, 1000, \
"Interval in milliseconds that CMS thread checks if it " \
"should start a collection cycle") \
\
product(bool, CMSYield, true, \
"Yield between steps of CMS") \
\
product(uintx, CMSBitMapYieldQuantum, 10*M, \
"Bitmap operations should process at most this many bits " \
"between yields") \
\
product(bool, CMSDumpAtPromotionFailure, false, \
"Dump useful information about the state of the CMS old " \
"generation upon a promotion failure") \
\
product(bool, CMSPrintChunksInDump, false, \
"In a dump enabled by CMSDumpAtPromotionFailure, include " \
"more detailed information about the free chunks") \
\
product(bool, CMSPrintObjectsInDump, false, \
"In a dump enabled by CMSDumpAtPromotionFailure, include " \
"more detailed information about the allocated objects") \
\
diagnostic(bool, FLSVerifyAllHeapReferences, false, \
"Verify that all references across the FLS boundary " \
"are to valid objects") \
\
diagnostic(bool, FLSVerifyLists, false, \
"Do lots of (expensive) FreeListSpace verification") \
\
diagnostic(bool, FLSVerifyIndexTable, false, \
"Do lots of (expensive) FLS index table verification") \
\
develop(bool, FLSVerifyDictionary, false, \
"Do lots of (expensive) FLS dictionary verification") \
\
develop(bool, VerifyBlockOffsetArray, false, \
"Do (expensive) block offset array verification") \
\
diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \
"Maintain _unallocated_block in BlockOffsetArray " \
"(currently applicable only to CMS collector)") \
\
develop(bool, TraceCMSState, false, \
"Trace the state of the CMS collection") \
\
product(intx, RefDiscoveryPolicy, 0, \
"Select type of reference discovery policy: " \
"reference-based(0) or referent-based(1)") \
\
product(bool, ParallelRefProcEnabled, false, \
"Enable parallel reference processing whenever possible") \
\
product(bool, ParallelRefProcBalancingEnabled, true, \
"Enable balancing of reference processing queues") \
\
product(uintx, CMSTriggerRatio, 80, \
"Percentage of MinHeapFreeRatio in CMS generation that is " \
"allocated before a CMS collection cycle commences") \
\
product(uintx, CMSBootstrapOccupancy, 50, \
"Percentage CMS generation occupancy at which to " \
"initiate CMS collection for bootstrapping collection stats") \
\
product(intx, CMSInitiatingOccupancyFraction, -1, \
"Percentage CMS generation occupancy to start a CMS collection " \
"cycle. A negative value means that CMSTriggerRatio is used") \
\
product(uintx, InitiatingHeapOccupancyPercent, 45, \
"Percentage of the (entire) heap occupancy to start a " \
"concurrent GC cycle. It is used by GCs that trigger a " \
"concurrent GC cycle based on the occupancy of the entire heap, " \
"not just one of the generations (e.g., G1). A value of 0 " \
"denotes 'do constant GC cycles'.") \
\
product(bool, UseCMSInitiatingOccupancyOnly, false, \
"Only use occupancy as a criterion for starting a CMS collection")\
\
product(uintx, CMSIsTooFullPercentage, 98, \
"An absolute ceiling above which CMS will always consider the " \
"unloading of classes when class unloading is enabled") \
\
develop(bool, CMSTestInFreeList, false, \
"Check if the coalesced range is already in the " \
"free lists as claimed") \
\
notproduct(bool, CMSVerifyReturnedBytes, false, \
"Check that all the garbage collected was returned to the " \
"free lists") \
\
notproduct(bool, ScavengeALot, false, \
"Force scavenge at every Nth exit from the runtime system " \
"(N=ScavengeALotInterval)") \
\
develop(bool, FullGCALot, false, \
"Force full gc at every Nth exit from the runtime system " \
"(N=FullGCALotInterval)") \
\
notproduct(bool, GCALotAtAllSafepoints, false, \
"Enforce ScavengeALot/GCALot at all potential safepoints") \
\
product(bool, PrintPromotionFailure, false, \
"Print additional diagnostic information following " \
"promotion failure") \
\
notproduct(bool, PromotionFailureALot, false, \
"Use promotion failure handling on every youngest generation " \
"collection") \
\
develop(uintx, PromotionFailureALotCount, 1000, \
"Number of promotion failures occurring at ParGCAllocBuffer " \
"refill attempts (ParNew) or promotion attempts " \
"(other young collectors)") \
\
develop(uintx, PromotionFailureALotInterval, 5, \
"Total collections between promotion failures alot") \
\
experimental(uintx, WorkStealingSleepMillis, 1, \
"Sleep time when sleep is used for yields") \
\
experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \
"Number of yields before a sleep is done during workstealing") \
\
experimental(uintx, WorkStealingHardSpins, 4096, \
"Number of iterations in a spin loop between checks on " \
"time out of hard spin") \
\
experimental(uintx, WorkStealingSpinToYieldRatio, 10, \
"Ratio of hard spins to calls to yield") \
\
develop(uintx, ObjArrayMarkingStride, 512, \
"Number of object array elements to push onto the marking stack " \
"before pushing a continuation entry") \
\
develop(bool, MetadataAllocationFailALot, false, \
"Fail metadata allocations at intervals controlled by " \
"MetadataAllocationFailALotInterval") \
\
develop(uintx, MetadataAllocationFailALotInterval, 1000, \
"Metadata allocation failure a lot interval") \
\
develop(bool, TraceMetadataChunkAllocation, false, \
"Trace chunk metadata allocations") \
\
product(bool, TraceMetadataHumongousAllocation, false, \
"Trace humongous metadata allocations") \
\
develop(bool, TraceMetavirtualspaceAllocation, false, \
"Trace virtual space metadata allocations") \
\
notproduct(bool, ExecuteInternalVMTests, false, \
"Enable execution of internal VM tests") \
\
notproduct(bool, VerboseInternalVMTests, false, \
"Turn on logging for internal VM tests.") \
\
product_pd(bool, UseTLAB, "Use thread-local object allocation") \
\
product_pd(bool, ResizeTLAB, \
"Dynamically resize TLAB size for threads") \
\
product(bool, ZeroTLAB, false, \
"Zero out the newly created TLAB") \
\
product(bool, FastTLABRefill, true, \
"Use fast TLAB refill code") \
\
product(bool, PrintTLAB, false, \
"Print various TLAB related information") \
\
product(bool, TLABStats, true, \
"Provide more detailed and expensive TLAB statistics " \
"(with PrintTLAB)") \
\
EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \
"Enable LowMemoryProtection")) \
\
product_pd(bool, NeverActAsServerClassMachine, \
"Never act like a server-class machine") \
\
product(bool, AlwaysActAsServerClassMachine, false, \
"Always act like a server-class machine") \
\
product_pd(uint64_t, MaxRAM, \
"Real memory size (in bytes) used to set maximum heap size") \
\
product(uintx, ErgoHeapSizeLimit, 0, \
"Maximum ergonomically set heap size (in bytes); zero means use " \
"MaxRAM / MaxRAMFraction") \
\
product(uintx, MaxRAMFraction, 4, \
"Maximum fraction (1/n) of real memory used for maximum heap " \
"size") \
\
product(uintx, DefaultMaxRAMFraction, 4, \
"Maximum fraction (1/n) of real memory used for maximum heap " \
"size; deprecated: to be renamed to MaxRAMFraction") \
\
product(uintx, MinRAMFraction, 2, \
"Minimum fraction (1/n) of real memory used for maxmimum heap " \
"size on systems with small physical memory size") \
\
product(uintx, InitialRAMFraction, 64, \
"Fraction (1/n) of real memory used for initial heap size") \
\
develop(uintx, MaxVirtMemFraction, 2, \
"Maximum fraction (1/n) of virtual memory used for ergonomically "\
"determining maximum heap size") \
\
product(bool, UseAutoGCSelectPolicy, false, \
"Use automatic collection selection policy") \
\
product(uintx, AutoGCSelectPauseMillis, 5000, \
"Automatic GC selection pause threshold in milliseconds") \
\
product(bool, UseAdaptiveSizePolicy, true, \
"Use adaptive generation sizing policies") \
\
product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \
"Use adaptive survivor sizing policies") \
\
product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \
"Use adaptive young-old sizing policies at minor collections") \
\
product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \
"Use adaptive young-old sizing policies at major collections") \
\
product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \
"Include statistics from System.gc() for adaptive size policy") \
\
product(bool, UseAdaptiveGCBoundary, false, \
"Allow young-old boundary to move") \
\
develop(bool, TraceAdaptiveGCBoundary, false, \
"Trace young-old boundary moves") \
\
develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \
"Resize the virtual spaces of the young or old generations") \
\
product(uintx, AdaptiveSizeThroughPutPolicy, 0, \
"Policy for changing generation size for throughput goals") \
\
product(uintx, AdaptiveSizePausePolicy, 0, \
"Policy for changing generation size for pause goals") \
\
develop(bool, PSAdjustTenuredGenForMinorPause, false, \
"Adjust tenured generation to achieve a minor pause goal") \
\
develop(bool, PSAdjustYoungGenForMajorPause, false, \
"Adjust young generation to achieve a major pause goal") \
\
product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \
"Number of steps where heuristics is used before data is used") \
\
develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \
"Number of collections before the adaptive sizing is started") \
\
product(uintx, AdaptiveSizePolicyOutputInterval, 0, \
"Collection interval for printing information; zero means never") \
\
product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \
"Use adaptive minimum footprint as a goal") \
\
product(uintx, AdaptiveSizePolicyWeight, 10, \
"Weight given to exponential resizing, between 0 and 100") \
\
product(uintx, AdaptiveTimeWeight, 25, \
"Weight given to time in adaptive policy, between 0 and 100") \
\
product(uintx, PausePadding, 1, \
"How much buffer to keep for pause time") \
\
product(uintx, PromotedPadding, 3, \
"How much buffer to keep for promotion failure") \
\
product(uintx, SurvivorPadding, 3, \
"How much buffer to keep for survivor overflow") \
\
product(uintx, ThresholdTolerance, 10, \
"Allowed collection cost difference between generations") \
\
product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \
"If collection costs are within margin, reduce both by full " \
"delta") \
\
product(uintx, YoungGenerationSizeIncrement, 20, \
"Adaptive size percentage change in young generation") \
\
product(uintx, YoungGenerationSizeSupplement, 80, \
"Supplement to YoungedGenerationSizeIncrement used at startup") \
\
product(uintx, YoungGenerationSizeSupplementDecay, 8, \
"Decay factor to YoungedGenerationSizeSupplement") \
\
product(uintx, TenuredGenerationSizeIncrement, 20, \
"Adaptive size percentage change in tenured generation") \
\
product(uintx, TenuredGenerationSizeSupplement, 80, \
"Supplement to TenuredGenerationSizeIncrement used at startup") \
\
product(uintx, TenuredGenerationSizeSupplementDecay, 2, \
"Decay factor to TenuredGenerationSizeIncrement") \
\
product(uintx, MaxGCPauseMillis, max_uintx, \
"Adaptive size policy maximum GC pause time goal in millisecond, "\
"or (G1 Only) the maximum GC time per MMU time slice") \
\
product(uintx, GCPauseIntervalMillis, 0, \
"Time slice for MMU specification") \
\
product(uintx, MaxGCMinorPauseMillis, max_uintx, \
"Adaptive size policy maximum GC minor pause time goal " \
"in millisecond") \
\
product(uintx, GCTimeRatio, 99, \
"Adaptive size policy application time to GC time ratio") \
\
product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \
"Adaptive size scale down factor for shrinking") \
\
product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \
"Adaptive size decays the major cost for long major intervals") \
\
product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \
"Time scale over which major costs decay") \
\
product(uintx, MinSurvivorRatio, 3, \
"Minimum ratio of young generation/survivor space size") \
\
product(uintx, InitialSurvivorRatio, 8, \
"Initial ratio of young generation/survivor space size") \
\
product(uintx, BaseFootPrintEstimate, 256*M, \
"Estimate of footprint other than Java Heap") \
\
product(bool, UseGCOverheadLimit, true, \
"Use policy to limit of proportion of time spent in GC " \
"before an OutOfMemory error is thrown") \
\
product(uintx, GCTimeLimit, 98, \
"Limit of the proportion of time spent in GC before " \
"an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \
\
product(uintx, GCHeapFreeLimit, 2, \
"Minimum percentage of free space after a full GC before an " \
"OutOfMemoryError is thrown (used with GCTimeLimit)") \
\
develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \
"Number of consecutive collections before gc time limit fires") \
\
product(bool, PrintAdaptiveSizePolicy, false, \
"Print information about AdaptiveSizePolicy") \
\
product(intx, PrefetchCopyIntervalInBytes, -1, \
"How far ahead to prefetch destination area (<= 0 means off)") \
\
product(intx, PrefetchScanIntervalInBytes, -1, \
"How far ahead to prefetch scan area (<= 0 means off)") \
\
product(intx, PrefetchFieldsAhead, -1, \
"How many fields ahead to prefetch in oop scan (<= 0 means off)") \
\
diagnostic(bool, VerifySilently, false, \
"Do not print the verification progress") \
\
diagnostic(bool, VerifyDuringStartup, false, \
"Verify memory system before executing any Java code " \
"during VM initialization") \
\
diagnostic(bool, VerifyBeforeExit, trueInDebug, \
"Verify system before exiting") \
\
diagnostic(bool, VerifyBeforeGC, false, \
"Verify memory system before GC") \
\
diagnostic(bool, VerifyAfterGC, false, \
"Verify memory system after GC") \
\
diagnostic(bool, VerifyDuringGC, false, \
"Verify memory system during GC (between phases)") \
\
diagnostic(bool, GCParallelVerificationEnabled, true, \
"Enable parallel memory system verification") \
\
diagnostic(bool, DeferInitialCardMark, false, \
"When +ReduceInitialCardMarks, explicitly defer any that " \
"may arise from new_pre_store_barrier") \
\
diagnostic(bool, VerifyRememberedSets, false, \
"Verify GC remembered sets") \
\
diagnostic(bool, VerifyObjectStartArray, true, \
"Verify GC object start array if verify before/after") \
\
product(bool, DisableExplicitGC, false, \
"Ignore calls to System.gc()") \
\
notproduct(bool, CheckMemoryInitialization, false, \
"Check memory initialization") \
\
product(bool, CollectGen0First, false, \
"Collect youngest generation before each full GC") \
\
diagnostic(bool, BindCMSThreadToCPU, false, \
"Bind CMS Thread to CPU if possible") \
\
diagnostic(uintx, CPUForCMSThread, 0, \
"When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
\
product(bool, BindGCTaskThreadsToCPUs, false, \
"Bind GCTaskThreads to CPUs if possible") \
\
product(bool, UseGCTaskAffinity, false, \
"Use worker affinity when asking for GCTasks") \
\
product(uintx, ProcessDistributionStride, 4, \
"Stride through processors when distributing processes") \
\
product(uintx, CMSCoordinatorYieldSleepCount, 10, \
"Number of times the coordinator GC thread will sleep while " \
"yielding before giving up and resuming GC") \
\
product(uintx, CMSYieldSleepCount, 0, \
"Number of times a GC thread (minus the coordinator) " \
"will sleep while yielding before giving up and resuming GC") \
\
/* gc tracing */ \
manageable(bool, PrintGC, false, \
"Print message at garbage collection") \
\
manageable(bool, PrintGCDetails, false, \
"Print more details at garbage collection") \
\
manageable(bool, PrintGCDateStamps, false, \
"Print date stamps at garbage collection") \
\
manageable(bool, PrintGCTimeStamps, false, \
"Print timestamps at garbage collection") \
\
product(bool, PrintGCTaskTimeStamps, false, \
"Print timestamps for individual gc worker thread tasks") \
\
develop(intx, ConcGCYieldTimeout, 0, \
"If non-zero, assert that GC threads yield within this " \
"number of milliseconds") \
\
notproduct(bool, TraceMarkSweep, false, \
"Trace mark sweep") \
\
product(bool, PrintReferenceGC, false, \
"Print times spent handling reference objects during GC " \
"(enabled only when PrintGCDetails)") \
\
develop(bool, TraceReferenceGC, false, \
"Trace handling of soft/weak/final/phantom references") \
\
develop(bool, TraceFinalizerRegistration, false, \
"Trace registration of final references") \
\
notproduct(bool, TraceScavenge, false, \
"Trace scavenge") \
\
product_rw(bool, TraceClassLoading, false, \
"Trace all classes loaded") \
\
product(bool, TraceClassLoadingPreorder, false, \
"Trace all classes loaded in order referenced (not loaded)") \
\
product_rw(bool, TraceClassUnloading, false, \
"Trace unloading of classes") \
\
product_rw(bool, TraceLoaderConstraints, false, \
"Trace loader constraints") \
\
develop(bool, TraceClassLoaderData, false, \
"Trace class loader loader_data lifetime") \
\
product(uintx, InitialBootClassLoaderMetaspaceSize, \
NOT_LP64(2200*K) LP64_ONLY(4*M), \
"Initial size of the boot class loader data metaspace") \
\
product(bool, TraceGen0Time, false, \
"Trace accumulated time for Gen 0 collection") \
\
product(bool, TraceGen1Time, false, \
"Trace accumulated time for Gen 1 collection") \
\
product(bool, PrintTenuringDistribution, false, \
"Print tenuring age information") \
\
product_rw(bool, PrintHeapAtGC, false, \
"Print heap layout before and after each GC") \
\
product_rw(bool, PrintHeapAtGCExtended, false, \
"Print extended information about the layout of the heap " \
"when -XX:+PrintHeapAtGC is set") \
\
product(bool, PrintHeapAtSIGBREAK, true, \
"Print heap layout in response to SIGBREAK") \
\
manageable(bool, PrintClassHistogramBeforeFullGC, false, \
"Print a class histogram before any major stop-world GC") \
\
manageable(bool, PrintClassHistogramAfterFullGC, false, \
"Print a class histogram after any major stop-world GC") \
\
manageable(bool, PrintClassHistogram, false, \
"Print a histogram of class instances") \
\
develop(bool, TraceWorkGang, false, \
"Trace activities of work gangs") \
\
product(bool, TraceParallelOldGCTasks, false, \
"Trace multithreaded GC activity") \
\
develop(bool, TraceBlockOffsetTable, false, \
"Print BlockOffsetTable maps") \
\
develop(bool, TraceCardTableModRefBS, false, \
"Print CardTableModRefBS maps") \
\
develop(bool, TraceGCTaskManager, false, \
"Trace actions of the GC task manager") \
\
develop(bool, TraceGCTaskQueue, false, \
"Trace actions of the GC task queues") \
\
diagnostic(bool, TraceGCTaskThread, false, \
"Trace actions of the GC task threads") \
\
product(bool, PrintParallelOldGCPhaseTimes, false, \
"Print the time taken by each phase in ParallelOldGC " \
"(PrintGCDetails must also be enabled)") \
\
develop(bool, TraceParallelOldGCMarkingPhase, false, \
"Trace marking phase in ParallelOldGC") \
\
develop(bool, TraceParallelOldGCSummaryPhase, false, \
"Trace summary phase in ParallelOldGC") \
\
develop(bool, TraceParallelOldGCCompactionPhase, false, \
"Trace compaction phase in ParallelOldGC") \
\
develop(bool, TraceParallelOldGCDensePrefix, false, \
"Trace dense prefix computation for ParallelOldGC") \
\
develop(bool, IgnoreLibthreadGPFault, false, \
"Suppress workaround for libthread GP fault") \
\
product(bool, PrintJNIGCStalls, false, \
"Print diagnostic message when GC is stalled " \
"by JNI critical section") \
\
experimental(double, ObjectCountCutOffPercent, 0.5, \
"The percentage of the used heap that the instances of a class " \
"must occupy for the class to generate a trace event") \
\
/* GC log rotation setting */ \
\
product(bool, UseGCLogFileRotation, false, \
"Rotate gclog files (for long running applications). It requires "\
"-Xloggc:<filename>") \
\
product(uintx, NumberOfGCLogFiles, 0, \
"Number of gclog files in rotation " \
"(default: 0, no rotation)") \
\
product(uintx, GCLogFileSize, 0, \
"GC log file size (default: 0 bytes, no rotation). " \
"It requires UseGCLogFileRotation") \
\
/* JVMTI heap profiling */ \
\
diagnostic(bool, TraceJVMTIObjectTagging, false, \
"Trace JVMTI object tagging calls") \
\
diagnostic(bool, VerifyBeforeIteration, false, \
"Verify memory system before JVMTI iteration") \
\
/* compiler interface */ \
\
develop(bool, CIPrintCompilerName, false, \
"when CIPrint is active, print the name of the active compiler") \
\
develop(bool, CIPrintCompileQueue, false, \
"display the contents of the compile queue whenever a " \
"compilation is enqueued") \
\
develop(bool, CIPrintRequests, false, \
"display every request for compilation") \
\
product(bool, CITime, false, \
"collect timing information for compilation") \
\
develop(bool, CITimeEach, false, \
"display timing information after each successful compilation") \
\
develop(bool, CICountOSR, false, \
"use a separate counter when assigning ids to osr compilations") \
\
develop(bool, CICompileNatives, true, \
"compile native methods if supported by the compiler") \
\
develop_pd(bool, CICompileOSR, \
"compile on stack replacement methods if supported by the " \
"compiler") \
\
develop(bool, CIPrintMethodCodes, false, \
"print method bytecodes of the compiled code") \
\
develop(bool, CIPrintTypeFlow, false, \
"print the results of ciTypeFlow analysis") \
\
develop(bool, CITraceTypeFlow, false, \
"detailed per-bytecode tracing of ciTypeFlow analysis") \
\
develop(intx, OSROnlyBCI, -1, \
"OSR only at this bci. Negative values mean exclude that bci") \
\
/* compiler */ \
\
product(intx, CICompilerCount, CI_COMPILER_COUNT, \
"Number of compiler threads to run") \
\
product(intx, CompilationPolicyChoice, 0, \
"which compilation policy (0/1)") \
\
develop(bool, UseStackBanging, true, \
"use stack banging for stack overflow checks (required for " \
"proper StackOverflow handling; disable only to measure cost " \
"of stackbanging)") \
\
develop(bool, UseStrictFP, true, \
"use strict fp if modifier strictfp is set") \
\
develop(bool, GenerateSynchronizationCode, true, \
"generate locking/unlocking code for synchronized methods and " \
"monitors") \
\
develop(bool, GenerateCompilerNullChecks, true, \
"Generate explicit null checks for loads/stores/calls") \
\
develop(bool, GenerateRangeChecks, true, \
"Generate range checks for array accesses") \
\
develop_pd(bool, ImplicitNullChecks, \
"Generate code for implicit null checks") \
\
product(bool, PrintSafepointStatistics, false, \
"Print statistics about safepoint synchronization") \
\
product(intx, PrintSafepointStatisticsCount, 300, \
"Total number of safepoint statistics collected " \
"before printing them out") \
\
product(intx, PrintSafepointStatisticsTimeout, -1, \
"Print safepoint statistics only when safepoint takes " \
"more than PrintSafepointSatisticsTimeout in millis") \
\
product(bool, TraceSafepointCleanupTime, false, \
"Print the break down of clean up tasks performed during " \
"safepoint") \
\
product(bool, Inline, true, \
"Enable inlining") \
\
product(bool, ClipInlining, true, \
"Clip inlining if aggregate method exceeds DesiredMethodLimit") \
\
develop(bool, UseCHA, true, \
"Enable CHA") \
\
product(bool, UseTypeProfile, true, \
"Check interpreter profile for historically monomorphic calls") \
\
notproduct(bool, TimeCompiler, false, \
"Time the compiler") \
\
diagnostic(bool, PrintInlining, false, \
"Print inlining optimizations") \
\
product(bool, UsePopCountInstruction, false, \
"Use population count instruction") \
\
develop(bool, EagerInitialization, false, \
"Eagerly initialize classes if possible") \
\
develop(bool, TraceMethodReplacement, false, \
"Print when methods are replaced do to recompilation") \
\
develop(bool, PrintMethodFlushing, false, \
"Print the nmethods being flushed") \
\
develop(bool, UseRelocIndex, false, \
"Use an index to speed random access to relocations") \
\
develop(bool, StressCodeBuffers, false, \
"Exercise code buffer expansion and other rare state changes") \
\
diagnostic(bool, DebugNonSafepoints, trueInDebug, \
"Generate extra debugging information for non-safepoints in " \
"nmethods") \
\
product(bool, PrintVMOptions, false, \
"Print flags that appeared on the command line") \
\
product(bool, IgnoreUnrecognizedVMOptions, false, \
"Ignore unrecognized VM options") \
\
product(bool, PrintCommandLineFlags, false, \
"Print flags specified on command line or set by ergonomics") \
\
product(bool, PrintFlagsInitial, false, \
"Print all VM flags before argument processing and exit VM") \
\
product(bool, PrintFlagsFinal, false, \
"Print all VM flags after argument and ergonomic processing") \
\
notproduct(bool, PrintFlagsWithComments, false, \
"Print all VM flags with default values and descriptions and " \
"exit") \
\
diagnostic(bool, SerializeVMOutput, true, \
"Use a mutex to serialize output to tty and LogFile") \
\
diagnostic(bool, DisplayVMOutput, true, \
"Display all VM output on the tty, independently of LogVMOutput") \
\
diagnostic(bool, LogVMOutput, false, \
"Save VM output to LogFile") \
\
diagnostic(ccstr, LogFile, NULL, \
"If LogVMOutput or LogCompilation is on, save VM output to " \
"this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
\
product(ccstr, ErrorFile, NULL, \
"If an error occurs, save the error data to this file " \
"[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
\
product(bool, DisplayVMOutputToStderr, false, \
"If DisplayVMOutput is true, display all VM output to stderr") \
\
product(bool, DisplayVMOutputToStdout, false, \
"If DisplayVMOutput is true, display all VM output to stdout") \
\
product(bool, UseHeavyMonitors, false, \
"use heavyweight instead of lightweight Java monitors") \
\
product(bool, PrintStringTableStatistics, false, \
"print statistics about the StringTable and SymbolTable") \
\
diagnostic(bool, VerifyStringTableAtExit, false, \
"verify StringTable contents at exit") \
\
notproduct(bool, PrintSymbolTableSizeHistogram, false, \
"print histogram of the symbol table") \
\
notproduct(bool, ExitVMOnVerifyError, false, \
"standard exit from VM if bytecode verify error " \
"(only in debug mode)") \
\
notproduct(ccstr, AbortVMOnException, NULL, \
"Call fatal if this exception is thrown. Example: " \
"java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
\
notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \
"Call fatal if the exception pointed by AbortVMOnException " \
"has this message") \
\
develop(bool, DebugVtables, false, \
"add debugging code to vtable dispatch") \
\
develop(bool, PrintVtables, false, \
"print vtables when printing klass") \
\
notproduct(bool, PrintVtableStats, false, \
"print vtables stats at end of run") \
\
develop(bool, TraceCreateZombies, false, \
"trace creation of zombie nmethods") \
\
notproduct(bool, IgnoreLockingAssertions, false, \
"disable locking assertions (for speed)") \
\
product(bool, RangeCheckElimination, true, \
"Eliminate range checks") \
\
develop_pd(bool, UncommonNullCast, \
"track occurrences of null in casts; adjust compiler tactics") \
\
develop(bool, TypeProfileCasts, true, \
"treat casts like calls for purposes of type profiling") \
\
develop(bool, DelayCompilationDuringStartup, true, \
"Delay invoking the compiler until main application class is " \
"loaded") \
\
develop(bool, CompileTheWorld, false, \
"Compile all methods in all classes in bootstrap class path " \
"(stress test)") \
\
develop(bool, CompileTheWorldPreloadClasses, true, \
"Preload all classes used by a class before start loading") \
\
notproduct(intx, CompileTheWorldSafepointInterval, 100, \
"Force a safepoint every n compiles so sweeper can keep up") \
\
develop(bool, FillDelaySlots, true, \
"Fill delay slots (on SPARC only)") \
\
develop(bool, TimeLivenessAnalysis, false, \
"Time computation of bytecode liveness analysis") \
\
develop(bool, TraceLivenessGen, false, \
"Trace the generation of liveness analysis information") \
\
notproduct(bool, TraceLivenessQuery, false, \
"Trace queries of liveness analysis information") \
\
notproduct(bool, CollectIndexSetStatistics, false, \
"Collect information about IndexSets") \
\
develop(bool, UseLoopSafepoints, true, \
"Generate Safepoint nodes in every loop") \
\
develop(intx, FastAllocateSizeLimit, 128*K, \
/* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
"Inline allocations larger than this in doublewords must go slow")\
\
product(bool, AggressiveOpts, false, \
"Enable aggressive optimizations - see arguments.cpp") \
\
product_pd(uintx, TypeProfileLevel, \
"=XYZ, with Z: Type profiling of arguments at call; " \
"Y: Type profiling of return value at call; " \
"X: Type profiling of parameters to methods; " \
"X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
\
product(intx, TypeProfileArgsLimit, 2, \
"max number of call arguments to consider for type profiling") \
\
product(intx, TypeProfileParmsLimit, 2, \
"max number of incoming parameters to consider for type profiling"\
", -1 for all") \
\
/* statistics */ \
develop(bool, CountCompiledCalls, false, \
"Count method invocations") \
\
notproduct(bool, CountRuntimeCalls, false, \
"Count VM runtime calls") \
\
develop(bool, CountJNICalls, false, \
"Count jni method invocations") \
\
notproduct(bool, CountJVMCalls, false, \
"Count jvm method invocations") \
\
notproduct(bool, CountRemovableExceptions, false, \
"Count exceptions that could be replaced by branches due to " \
"inlining") \
\
notproduct(bool, ICMissHistogram, false, \
"Produce histogram of IC misses") \
\
notproduct(bool, PrintClassStatistics, false, \
"Print class statistics at end of run") \
\
notproduct(bool, PrintMethodStatistics, false, \
"Print method statistics at end of run") \
\
/* interpreter */ \
develop(bool, ClearInterpreterLocals, false, \
"Always clear local variables of interpreter activations upon " \
"entry") \
\
product_pd(bool, RewriteBytecodes, \
"Allow rewriting of bytecodes (bytecodes are not immutable)") \
\
product_pd(bool, RewriteFrequentPairs, \
"Rewrite frequently used bytecode pairs into a single bytecode") \
\
diagnostic(bool, PrintInterpreter, false, \
"Print the generated interpreter code") \
\
product(bool, UseInterpreter, true, \
"Use interpreter for non-compiled methods") \
\
develop(bool, UseFastSignatureHandlers, true, \
"Use fast signature handlers for native calls") \
\
product(bool, UseLoopCounter, true, \
"Increment invocation counter on backward branch") \
\
product(bool, UseFastEmptyMethods, true, \
"Use fast method entry code for empty methods") \
\
product(bool, UseFastAccessorMethods, true, \
"Use fast method entry code for accessor methods") \
\
product_pd(bool, UseOnStackReplacement, \
"Use on stack replacement, calls runtime if invoc. counter " \
"overflows in loop") \
\
notproduct(bool, TraceOnStackReplacement, false, \
"Trace on stack replacement") \
\
product_pd(bool, PreferInterpreterNativeStubs, \
"Use always interpreter stubs for native methods invoked via " \
"interpreter") \
\
develop(bool, CountBytecodes, false, \
"Count number of bytecodes executed") \
\
develop(bool, PrintBytecodeHistogram, false, \
"Print histogram of the executed bytecodes") \
\
develop(bool, PrintBytecodePairHistogram, false, \
"Print histogram of the executed bytecode pairs") \
\
diagnostic(bool, PrintSignatureHandlers, false, \
"Print code generated for native method signature handlers") \
\
develop(bool, VerifyOops, false, \
"Do plausibility checks for oops") \
\
develop(bool, CheckUnhandledOops, false, \
"Check for unhandled oops in VM code") \
\
develop(bool, VerifyJNIFields, trueInDebug, \
"Verify jfieldIDs for instance fields") \
\
notproduct(bool, VerifyJNIEnvThread, false, \
"Verify JNIEnv.thread == Thread::current() when entering VM " \
"from JNI") \
\
develop(bool, VerifyFPU, false, \
"Verify FPU state (check for NaN's, etc.)") \
\
develop(bool, VerifyThread, false, \
"Watch the thread register for corruption (SPARC only)") \
\
develop(bool, VerifyActivationFrameSize, false, \
"Verify that activation frame didn't become smaller than its " \
"minimal size") \
\
develop(bool, TraceFrequencyInlining, false, \
"Trace frequency based inlining") \
\
develop_pd(bool, InlineIntrinsics, \
"Inline intrinsics that can be statically resolved") \
\
product_pd(bool, ProfileInterpreter, \
"Profile at the bytecode level during interpretation") \
\
develop_pd(bool, ProfileTraps, \
"Profile deoptimization traps at the bytecode level") \
\
product(intx, ProfileMaturityPercentage, 20, \
"number of method invocations/branches (expressed as % of " \
"CompileThreshold) before using the method's profile") \
\
develop(bool, PrintMethodData, false, \
"Print the results of +ProfileInterpreter at end of run") \
\
develop(bool, VerifyDataPointer, trueInDebug, \
"Verify the method data pointer during interpreter profiling") \
\
develop(bool, VerifyCompiledCode, false, \
"Include miscellaneous runtime verifications in nmethod code; " \
"default off because it disturbs nmethod size heuristics") \
\
notproduct(bool, CrashGCForDumpingJavaThread, false, \
"Manually make GC thread crash then dump java stack trace; " \
"Test only") \
\
/* compilation */ \
product(bool, UseCompiler, true, \
"Use Just-In-Time compilation") \
\
develop(bool, TraceCompilationPolicy, false, \
"Trace compilation policy") \
\
develop(bool, TimeCompilationPolicy, false, \
"Time the compilation policy") \
\
product(bool, UseCounterDecay, true, \
"Adjust recompilation counters") \
\
develop(intx, CounterHalfLifeTime, 30, \
"Half-life time of invocation counters (in seconds)") \
\
develop(intx, CounterDecayMinIntervalLength, 500, \
"The minimum interval (in milliseconds) between invocation of " \
"CounterDecay") \
\
product(bool, AlwaysCompileLoopMethods, false, \
"When using recompilation, never interpret methods " \
"containing loops") \
\
product(bool, DontCompileHugeMethods, true, \
"Do not compile methods > HugeMethodLimit") \
\
/* Bytecode escape analysis estimation. */ \
product(bool, EstimateArgEscape, true, \
"Analyze bytecodes to estimate escape state of arguments") \
\
product(intx, BCEATraceLevel, 0, \
"How much tracing to do of bytecode escape analysis estimates") \
\
product(intx, MaxBCEAEstimateLevel, 5, \
"Maximum number of nested calls that are analyzed by BC EA") \
\
product(intx, MaxBCEAEstimateSize, 150, \
"Maximum bytecode size of a method to be analyzed by BC EA") \
\
product(intx, AllocatePrefetchStyle, 1, \
"0 = no prefetch, " \
"1 = prefetch instructions for each allocation, " \
"2 = use TLAB watermark to gate allocation prefetch, " \
"3 = use BIS instruction on Sparc for allocation prefetch") \
\
product(intx, AllocatePrefetchDistance, -1, \
"Distance to prefetch ahead of allocation pointer") \
\
product(intx, AllocatePrefetchLines, 3, \
"Number of lines to prefetch ahead of array allocation pointer") \
\
product(intx, AllocateInstancePrefetchLines, 1, \
"Number of lines to prefetch ahead of instance allocation " \
"pointer") \
\
product(intx, AllocatePrefetchStepSize, 16, \
"Step size in bytes of sequential prefetch instructions") \
\
product(intx, AllocatePrefetchInstr, 0, \
"Prefetch instruction to prefetch ahead of allocation pointer") \
\
/* deoptimization */ \
develop(bool, TraceDeoptimization, false, \
"Trace deoptimization") \
\
develop(bool, DebugDeoptimization, false, \
"Tracing various information while debugging deoptimization") \
\
product(intx, SelfDestructTimer, 0, \
"Will cause VM to terminate after a given time (in minutes) " \
"(0 means off)") \
\
product(intx, MaxJavaStackTraceDepth, 1024, \
"The maximum number of lines in the stack trace for Java " \
"exceptions (0 means all)") \
\
NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \
"Guarantee a safepoint (at least) every so many milliseconds " \
"(0 means none)")) \
\
EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \
"Guarantee a safepoint (at least) every so many milliseconds " \
"(0 means none)")) \
\
product(intx, SafepointTimeoutDelay, 10000, \
"Delay in milliseconds for option SafepointTimeout") \
\
product(intx, NmethodSweepFraction, 16, \
"Number of invocations of sweeper to cover all nmethods") \
\
product(intx, NmethodSweepCheckInterval, 5, \
"Compilers wake up every n seconds to possibly sweep nmethods") \
\
product(intx, NmethodSweepActivity, 10, \
"Removes cold nmethods from code cache if > 0. Higher values " \
"result in more aggressive sweeping") \
\
notproduct(bool, LogSweeper, false, \
"Keep a ring buffer of sweeper activity") \
\
notproduct(intx, SweeperLogEntries, 1024, \
"Number of records in the ring buffer of sweeper activity") \
\
notproduct(intx, MemProfilingInterval, 500, \
"Time between each invocation of the MemProfiler") \
\
develop(intx, MallocCatchPtr, -1, \
"Hit breakpoint when mallocing/freeing this pointer") \
\
notproduct(intx, AssertRepeat, 1, \
"number of times to evaluate expression in assert " \
"(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
\
notproduct(ccstrlist, SuppressErrorAt, "", \
"List of assertions (file:line) to muzzle") \
\
notproduct(uintx, HandleAllocationLimit, 1024, \
"Threshold for HandleMark allocation when +TraceHandleAllocation "\
"is used") \
\
develop(uintx, TotalHandleAllocationLimit, 1024, \
"Threshold for total handle allocation when " \
"+TraceHandleAllocation is used") \
\
develop(intx, StackPrintLimit, 100, \
"number of stack frames to print in VM-level stack dump") \
\
notproduct(intx, MaxElementPrintSize, 256, \
"maximum number of elements to print") \
\
notproduct(intx, MaxSubklassPrintSize, 4, \
"maximum number of subklasses to print when printing klass") \
\
product(intx, MaxInlineLevel, 9, \
"maximum number of nested calls that are inlined") \
\
product(intx, MaxRecursiveInlineLevel, 1, \
"maximum number of nested recursive calls that are inlined") \
\
develop(intx, MaxForceInlineLevel, 100, \
"maximum number of nested @ForceInline calls that are inlined") \
\
product_pd(intx, InlineSmallCode, \
"Only inline already compiled methods if their code size is " \
"less than this") \
\
product(intx, MaxInlineSize, 35, \
"The maximum bytecode size of a method to be inlined") \
\
product_pd(intx, FreqInlineSize, \
"The maximum bytecode size of a frequent method to be inlined") \
\
product(intx, MaxTrivialSize, 6, \
"The maximum bytecode size of a trivial method to be inlined") \
\
product(intx, MinInliningThreshold, 250, \
"The minimum invocation count a method needs to have to be " \
"inlined") \
\
develop(intx, MethodHistogramCutoff, 100, \
"The cutoff value for method invocation histogram (+CountCalls)") \
\
develop(intx, ProfilerNumberOfInterpretedMethods, 25, \
"Number of interpreted methods to show in profile") \
\
develop(intx, ProfilerNumberOfCompiledMethods, 25, \
"Number of compiled methods to show in profile") \
\
develop(intx, ProfilerNumberOfStubMethods, 25, \
"Number of stub methods to show in profile") \
\
develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \
"Number of runtime stub nodes to show in profile") \
\
product(intx, ProfileIntervalsTicks, 100, \
"Number of ticks between printing of interval profile " \
"(+ProfileIntervals)") \
\
notproduct(intx, ScavengeALotInterval, 1, \
"Interval between which scavenge will occur with +ScavengeALot") \
\
notproduct(intx, FullGCALotInterval, 1, \
"Interval between which full gc will occur with +FullGCALot") \
\
notproduct(intx, FullGCALotStart, 0, \
"For which invocation to start FullGCAlot") \
\
notproduct(intx, FullGCALotDummies, 32*K, \
"Dummy object allocated with +FullGCALot, forcing all objects " \
"to move") \
\
develop(intx, DontYieldALotInterval, 10, \
"Interval between which yields will be dropped (milliseconds)") \
\
develop(intx, MinSleepInterval, 1, \
"Minimum sleep() interval (milliseconds) when " \
"ConvertSleepToYield is off (used for Solaris)") \
\
develop(intx, ProfilerPCTickThreshold, 15, \
"Number of ticks in a PC buckets to be a hotspot") \
\
notproduct(intx, DeoptimizeALotInterval, 5, \
"Number of exits until DeoptimizeALot kicks in") \
\
notproduct(intx, ZombieALotInterval, 5, \
"Number of exits until ZombieALot kicks in") \
\
diagnostic(intx, MallocVerifyInterval, 0, \
"If non-zero, verify C heap after every N calls to " \
"malloc/realloc/free") \
\
diagnostic(intx, MallocVerifyStart, 0, \
"If non-zero, start verifying C heap after Nth call to " \
"malloc/realloc/free") \
\
diagnostic(uintx, MallocMaxTestWords, 0, \
"If non-zero, maximum number of words that malloc/realloc can " \
"allocate (for testing only)") \
\
product(intx, TypeProfileWidth, 2, \
"Number of receiver types to record in call/cast profile") \
\
develop(intx, BciProfileWidth, 2, \
"Number of return bci's to record in ret profile") \
\
product(intx, PerMethodRecompilationCutoff, 400, \
"After recompiling N times, stay in the interpreter (-1=>'Inf')") \
\
product(intx, PerBytecodeRecompilationCutoff, 200, \
"Per-BCI limit on repeated recompilation (-1=>'Inf')") \
\
product(intx, PerMethodTrapLimit, 100, \
"Limit on traps (of one kind) in a method (includes inlines)") \
\
product(intx, PerBytecodeTrapLimit, 4, \
"Limit on traps (of one kind) at a particular BCI") \
\
develop(intx, InlineFrequencyRatio, 20, \
"Ratio of call site execution to caller method invocation") \
\
develop_pd(intx, InlineFrequencyCount, \
"Count of call site execution necessary to trigger frequent " \
"inlining") \
\
develop(intx, InlineThrowCount, 50, \
"Force inlining of interpreted methods that throw this often") \
\
develop(intx, InlineThrowMaxSize, 200, \
"Force inlining of throwing methods smaller than this") \
\
develop(intx, ProfilerNodeSize, 1024, \
"Size in K to allocate for the Profile Nodes of each thread") \
\
product_pd(intx, PreInflateSpin, \
"Number of times to spin wait before inflation") \
\
/* gc parameters */ \
product(uintx, InitialHeapSize, 0, \
"Initial heap size (in bytes); zero means use ergonomics") \
\
product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \
"Maximum heap size (in bytes)") \
\
product(uintx, OldSize, ScaleForWordSize(4*M), \
"Initial tenured generation size (in bytes)") \
\
product(uintx, NewSize, ScaleForWordSize(1*M), \
"Initial new generation size (in bytes)") \
\
product(uintx, MaxNewSize, max_uintx, \
"Maximum new generation size (in bytes), max_uintx means set " \
"ergonomically") \
\
product(uintx, PretenureSizeThreshold, 0, \
"Maximum size in bytes of objects allocated in DefNew " \
"generation; zero means no maximum") \
\
product(uintx, TLABSize, 0, \
"Starting TLAB size (in bytes); zero means set ergonomically") \
\
product(uintx, MinTLABSize, 2*K, \
"Minimum allowed TLAB size (in bytes)") \
\
product(uintx, TLABAllocationWeight, 35, \
"Allocation averaging weight") \
\
product(uintx, TLABWasteTargetPercent, 1, \
"Percentage of Eden that can be wasted") \
\
product(uintx, TLABRefillWasteFraction, 64, \
"Maximum TLAB waste at a refill (internal fragmentation)") \
\
product(uintx, TLABWasteIncrement, 4, \
"Increment allowed waste at slow allocation") \
\
product(uintx, SurvivorRatio, 8, \
"Ratio of eden/survivor space size") \
\
product(uintx, NewRatio, 2, \
"Ratio of old/new generation sizes") \
\
product_pd(uintx, NewSizeThreadIncrease, \
"Additional size added to desired new generation size per " \
"non-daemon thread (in bytes)") \
\
product_pd(uintx, MetaspaceSize, \
"Initial size of Metaspaces (in bytes)") \
\
product(uintx, MaxMetaspaceSize, max_uintx, \
"Maximum size of Metaspaces (in bytes)") \
\
product(uintx, CompressedClassSpaceSize, 1*G, \
"Maximum size of class area in Metaspace when compressed " \
"class pointers are used") \
\
product(uintx, MinHeapFreeRatio, 40, \
"The minimum percentage of heap free after GC to avoid expansion."\
" For most GCs this applies to the old generation. In G1 it" \
" applies to the whole heap. Not supported by ParallelGC.") \
\
product(uintx, MaxHeapFreeRatio, 70, \
"The maximum percentage of heap free after GC to avoid shrinking."\
" For most GCs this applies to the old generation. In G1 it" \
" applies to the whole heap. Not supported by ParallelGC.") \
\
product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
"Number of milliseconds per MB of free space in the heap") \
\
product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
"The minimum change in heap space due to GC (in bytes)") \
\
product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
"The minimum expansion of Metaspace (in bytes)") \
\
product(uintx, MinMetaspaceFreeRatio, 40, \
"The minimum percentage of Metaspace free after GC to avoid " \
"expansion") \
\
product(uintx, MaxMetaspaceFreeRatio, 70, \
"The maximum percentage of Metaspace free after GC to avoid " \
"shrinking") \
\
product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
"The maximum expansion of Metaspace without full GC (in bytes)") \
\
product(uintx, QueuedAllocationWarningCount, 0, \
"Number of times an allocation that queues behind a GC " \
"will retry before printing a warning") \
\
diagnostic(uintx, VerifyGCStartAt, 0, \
"GC invoke count where +VerifyBefore/AfterGC kicks in") \
\
diagnostic(intx, VerifyGCLevel, 0, \
"Generation level at which to start +VerifyBefore/AfterGC") \
\
product(uintx, MaxTenuringThreshold, 15, \
"Maximum value for tenuring threshold") \
\
product(uintx, InitialTenuringThreshold, 7, \
"Initial value for tenuring threshold") \
\
product(uintx, TargetSurvivorRatio, 50, \
"Desired percentage of survivor space used after scavenge") \
\
product(uintx, MarkSweepDeadRatio, 5, \
"Percentage (0-100) of the old gen allowed as dead wood. " \
"Serial mark sweep treats this as both the minimum and maximum " \
"value. " \
"CMS uses this value only if it falls back to mark sweep. " \
"Par compact uses a variable scale based on the density of the " \
"generation and treats this as the maximum value when the heap " \
"is either completely full or completely empty. Par compact " \
"also has a smaller default value; see arguments.cpp.") \
\
product(uintx, MarkSweepAlwaysCompactCount, 4, \
"How often should we fully compact the heap (ignoring the dead " \
"space parameters)") \
\
product(intx, PrintCMSStatistics, 0, \
"Statistics for CMS") \
\
product(bool, PrintCMSInitiationStatistics, false, \
"Statistics for initiating a CMS collection") \
\
product(intx, PrintFLSStatistics, 0, \
"Statistics for CMS' FreeListSpace") \
\
product(intx, PrintFLSCensus, 0, \
"Census for CMS' FreeListSpace") \
\
develop(uintx, GCExpandToAllocateDelayMillis, 0, \
"Delay between expansion and allocation (in milliseconds)") \
\
develop(uintx, GCWorkerDelayMillis, 0, \
"Delay in scheduling GC workers (in milliseconds)") \
\
product(intx, DeferThrSuspendLoopCount, 4000, \
"(Unstable) Number of times to iterate in safepoint loop " \
"before blocking VM threads ") \
\
product(intx, DeferPollingPageLoopCount, -1, \
"(Unsafe,Unstable) Number of iterations in safepoint loop " \
"before changing safepoint polling page to RO ") \
\
product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \
\
product(bool, PSChunkLargeArrays, true, \
"Process large arrays in chunks") \
\
product(uintx, GCDrainStackTargetSize, 64, \
"Number of entries we will try to leave on the stack " \
"during parallel gc") \
\
/* stack parameters */ \
product_pd(intx, StackYellowPages, \
"Number of yellow zone (recoverable overflows) pages") \
\
product_pd(intx, StackRedPages, \
"Number of red zone (unrecoverable overflows) pages") \
\
product_pd(intx, StackShadowPages, \
"Number of shadow zone (for overflow checking) pages " \
"this should exceed the depth of the VM and native call stack") \
\
product_pd(intx, ThreadStackSize, \
"Thread Stack Size (in Kbytes)") \
\
product_pd(intx, VMThreadStackSize, \
"Non-Java Thread Stack Size (in Kbytes)") \
\
product_pd(intx, CompilerThreadStackSize, \
"Compiler Thread Stack Size (in Kbytes)") \
\
develop_pd(uintx, JVMInvokeMethodSlack, \
"Stack space (bytes) required for JVM_InvokeMethod to complete") \
\
product(uintx, ThreadSafetyMargin, 50*M, \
"Thread safety margin is used on fixed-stack LinuxThreads (on " \
"Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \
"disable this feature") \
\
/* code cache parameters */ \
develop(uintx, CodeCacheSegmentSize, 64, \
"Code cache segment size (in bytes) - smallest unit of " \
"allocation") \
\
develop_pd(intx, CodeEntryAlignment, \
"Code entry alignment for generated code (in bytes)") \
\
product_pd(intx, OptoLoopAlignment, \
"Align inner loops to zero relative to this modulus") \
\
product_pd(uintx, InitialCodeCacheSize, \
"Initial code cache size (in bytes)") \
\
develop_pd(uintx, CodeCacheMinimumUseSpace, \
"Minimum code cache size (in bytes) required to start VM.") \
\
product_pd(uintx, ReservedCodeCacheSize, \
"Reserved code cache size (in bytes) - maximum code cache size") \
\
product(uintx, CodeCacheMinimumFreeSpace, 500*K, \
"When less than X space left, we stop compiling") \
\
product_pd(uintx, CodeCacheExpansionSize, \
"Code cache expansion size (in bytes)") \
\
develop_pd(uintx, CodeCacheMinBlockLength, \
"Minimum number of segments in a code cache block") \
\
notproduct(bool, ExitOnFullCodeCache, false, \
"Exit the VM if we fill the code cache") \
\
product(bool, UseCodeCacheFlushing, true, \
"Remove cold/old nmethods from the code cache") \
\
/* interpreter debugging */ \
develop(intx, BinarySwitchThreshold, 5, \
"Minimal number of lookupswitch entries for rewriting to binary " \
"switch") \
\
develop(intx, StopInterpreterAt, 0, \
"Stop interpreter execution at specified bytecode number") \
\
develop(intx, TraceBytecodesAt, 0, \
"Trace bytecodes starting with specified bytecode number") \
\
/* compiler interface */ \
develop(intx, CIStart, 0, \
"The id of the first compilation to permit") \
\
develop(intx, CIStop, -1, \
"The id of the last compilation to permit") \
\
develop(intx, CIStartOSR, 0, \
"The id of the first osr compilation to permit " \
"(CICountOSR must be on)") \
\
develop(intx, CIStopOSR, -1, \
"The id of the last osr compilation to permit " \
"(CICountOSR must be on)") \
\
develop(intx, CIBreakAtOSR, -1, \
"The id of osr compilation to break at") \
\
develop(intx, CIBreakAt, -1, \
"The id of compilation to break at") \
\
product(ccstrlist, CompileOnly, "", \
"List of methods (pkg/class.name) to restrict compilation to") \
\
product(ccstr, CompileCommandFile, NULL, \
"Read compiler commands from this file [.hotspot_compiler]") \
\
product(ccstrlist, CompileCommand, "", \
"Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
\
develop(bool, ReplayCompiles, false, \
"Enable replay of compilations from ReplayDataFile") \
\
product(ccstr, ReplayDataFile, NULL, \
"File containing compilation replay information" \
"[default: ./replay_pid%p.log] (%p replaced with pid)") \
\
develop(intx, ReplaySuppressInitializers, 2, \
"Control handling of class initialization during replay: " \
"0 - don't do anything special; " \
"1 - treat all class initializers as empty; " \
"2 - treat class initializers for application classes as empty; " \
"3 - allow all class initializers to run during bootstrap but " \
" pretend they are empty after starting replay") \
\
develop(bool, ReplayIgnoreInitErrors, false, \
"Ignore exceptions thrown during initialization for replay") \
\
product(bool, DumpReplayDataOnError, true, \
"Record replay data for crashing compiler threads") \
\
product(bool, CICompilerCountPerCPU, false, \
"1 compiler thread for log(N CPUs)") \
\
develop(intx, CIFireOOMAt, -1, \
"Fire OutOfMemoryErrors throughout CI for testing the compiler " \
"(non-negative value throws OOM after this many CI accesses " \
"in each compile)") \
notproduct(intx, CICrashAt, -1, \
"id of compilation to trigger assert in compiler thread for " \
"the purpose of testing, e.g. generation of replay data") \
notproduct(bool, CIObjectFactoryVerify, false, \
"enable potentially expensive verification in ciObjectFactory") \
\
/* Priorities */ \
product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
\
product(intx, ThreadPriorityPolicy, 0, \
"0 : Normal. "\
" VM chooses priorities that are appropriate for normal "\
" applications. On Solaris NORM_PRIORITY and above are mapped "\
" to normal native priority. Java priorities below " \
" NORM_PRIORITY map to lower native priority values. On "\
" Windows applications are allowed to use higher native "\
" priorities. However, with ThreadPriorityPolicy=0, VM will "\
" not use the highest possible native priority, "\
" THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
" system threads. On Linux thread priorities are ignored "\
" because the OS does not support static priority in "\
" SCHED_OTHER scheduling class which is the only choice for "\
" non-root, non-realtime applications. "\
"1 : Aggressive. "\
" Java thread priorities map over to the entire range of "\
" native thread priorities. Higher Java thread priorities map "\
" to higher native thread priorities. This policy should be "\
" used with care, as sometimes it can cause performance "\
" degradation in the application and/or the entire system. On "\
" Linux this policy requires root privilege.") \
\
product(bool, ThreadPriorityVerbose, false, \
"Print priority changes") \
\
product(intx, DefaultThreadPriority, -1, \
"The native priority at which threads run if not elsewhere " \
"specified (-1 means no change)") \
\
product(intx, CompilerThreadPriority, -1, \
"The native priority at which compiler threads should run " \
"(-1 means no change)") \
\
product(intx, VMThreadPriority, -1, \
"The native priority at which the VM thread should run " \
"(-1 means no change)") \
\
product(bool, CompilerThreadHintNoPreempt, true, \
"(Solaris only) Give compiler threads an extra quanta") \
\
product(bool, VMThreadHintNoPreempt, false, \
"(Solaris only) Give VM thread an extra quanta") \
\
product(intx, JavaPriority1_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority2_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority3_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority4_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority5_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority6_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority7_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority8_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority9_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
\
product(intx, JavaPriority10_To_OSPriority,-1, \
"Map Java priorities to OS priorities") \
\
experimental(bool, UseCriticalJavaThreadPriority, false, \
"Java thread priority 10 maps to critical scheduling priority") \
\
experimental(bool, UseCriticalCompilerThreadPriority, false, \
"Compiler thread(s) run at critical scheduling priority") \
\
experimental(bool, UseCriticalCMSThreadPriority, false, \
"ConcurrentMarkSweep thread runs at critical scheduling priority")\
\
/* compiler debugging */ \
notproduct(intx, CompileTheWorldStartAt, 1, \
"First class to consider when using +CompileTheWorld") \
\
notproduct(intx, CompileTheWorldStopAt, max_jint, \
"Last class to consider when using +CompileTheWorld") \
\
develop(intx, NewCodeParameter, 0, \
"Testing Only: Create a dedicated integer parameter before " \
"putback") \
\
/* new oopmap storage allocation */ \
develop(intx, MinOopMapAllocation, 8, \
"Minimum number of OopMap entries in an OopMapSet") \
\
/* Background Compilation */ \
develop(intx, LongCompileThreshold, 50, \
"Used with +TraceLongCompiles") \
\
product(intx, StarvationMonitorInterval, 200, \
"Pause between each check (in milliseconds)") \
\
/* recompilation */ \
product_pd(intx, CompileThreshold, \
"number of interpreted method invocations before (re-)compiling") \
\
product_pd(intx, BackEdgeThreshold, \
"Interpreter Back edge threshold at which an OSR compilation is " \
"invoked") \
\
product(intx, Tier0InvokeNotifyFreqLog, 7, \
"Interpreter (tier 0) invocation notification frequency") \
\
product(intx, Tier2InvokeNotifyFreqLog, 11, \
"C1 without MDO (tier 2) invocation notification frequency") \
\
product(intx, Tier3InvokeNotifyFreqLog, 10, \
"C1 with MDO profiling (tier 3) invocation notification " \
"frequency") \
\
product(intx, Tier23InlineeNotifyFreqLog, 20, \
"Inlinee invocation (tiers 2 and 3) notification frequency") \
\
product(intx, Tier0BackedgeNotifyFreqLog, 10, \
"Interpreter (tier 0) invocation notification frequency") \
\
product(intx, Tier2BackedgeNotifyFreqLog, 14, \
"C1 without MDO (tier 2) invocation notification frequency") \
\
product(intx, Tier3BackedgeNotifyFreqLog, 13, \
"C1 with MDO profiling (tier 3) invocation notification " \
"frequency") \
\
product(intx, Tier2CompileThreshold, 0, \
"threshold at which tier 2 compilation is invoked") \
\
product(intx, Tier2BackEdgeThreshold, 0, \
"Back edge threshold at which tier 2 compilation is invoked") \
\
product(intx, Tier3InvocationThreshold, 200, \
"Compile if number of method invocations crosses this " \
"threshold") \
\
product(intx, Tier3MinInvocationThreshold, 100, \
"Minimum invocation to compile at tier 3") \
\
product(intx, Tier3CompileThreshold, 2000, \
"Threshold at which tier 3 compilation is invoked (invocation " \
"minimum must be satisfied") \
\
product(intx, Tier3BackEdgeThreshold, 60000, \
"Back edge threshold at which tier 3 OSR compilation is invoked") \
\
product(intx, Tier4InvocationThreshold, 5000, \
"Compile if number of method invocations crosses this " \
"threshold") \
\
product(intx, Tier4MinInvocationThreshold, 600, \
"Minimum invocation to compile at tier 4") \
\
product(intx, Tier4CompileThreshold, 15000, \
"Threshold at which tier 4 compilation is invoked (invocation " \
"minimum must be satisfied") \
\
product(intx, Tier4BackEdgeThreshold, 40000, \
"Back edge threshold at which tier 4 OSR compilation is invoked") \
\
product(intx, Tier3DelayOn, 5, \
"If C2 queue size grows over this amount per compiler thread " \
"stop compiling at tier 3 and start compiling at tier 2") \
\
product(intx, Tier3DelayOff, 2, \
"If C2 queue size is less than this amount per compiler thread " \
"allow methods compiled at tier 2 transition to tier 3") \
\
product(intx, Tier3LoadFeedback, 5, \
"Tier 3 thresholds will increase twofold when C1 queue size " \
"reaches this amount per compiler thread") \
\
product(intx, Tier4LoadFeedback, 3, \
"Tier 4 thresholds will increase twofold when C2 queue size " \
"reaches this amount per compiler thread") \
\
product(intx, TieredCompileTaskTimeout, 50, \
"Kill compile task if method was not used within " \
"given timeout in milliseconds") \
\
product(intx, TieredStopAtLevel, 4, \
"Stop at given compilation level") \
\
product(intx, Tier0ProfilingStartPercentage, 200, \
"Start profiling in interpreter if the counters exceed tier 3 " \
"thresholds by the specified percentage") \
\
product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
"Increase the compile threshold for C1 compilation if the code " \
"cache is filled by the specified percentage") \
\
product(intx, TieredRateUpdateMinTime, 1, \
"Minimum rate sampling interval (in milliseconds)") \
\
product(intx, TieredRateUpdateMaxTime, 25, \
"Maximum rate sampling interval (in milliseconds)") \
\
product_pd(bool, TieredCompilation, \
"Enable tiered compilation") \
\
product(bool, PrintTieredEvents, false, \
"Print tiered events notifications") \
\
product_pd(intx, OnStackReplacePercentage, \
"NON_TIERED number of method invocations/branches (expressed as " \
"% of CompileThreshold) before (re-)compiling OSR code") \
\
product(intx, InterpreterProfilePercentage, 33, \
"NON_TIERED number of method invocations/branches (expressed as " \
"% of CompileThreshold) before profiling in the interpreter") \
\
develop(intx, MaxRecompilationSearchLength, 10, \
"The maximum number of frames to inspect when searching for " \
"recompilee") \
\
develop(intx, MaxInterpretedSearchLength, 3, \
"The maximum number of interpreted frames to skip when searching "\
"for recompilee") \
\
develop(intx, DesiredMethodLimit, 8000, \
"The desired maximum method size (in bytecodes) after inlining") \
\
develop(intx, HugeMethodLimit, 8000, \
"Don't compile methods larger than this if " \
"+DontCompileHugeMethods") \
\
/* New JDK 1.4 reflection implementation */ \
\
develop(bool, UseNewReflection, true, \
"Temporary flag for transition to reflection based on dynamic " \
"bytecode generation in 1.4; can no longer be turned off in 1.4 " \
"JDK, and is unneeded in 1.3 JDK, but marks most places VM " \
"changes were needed") \
\
develop(bool, VerifyReflectionBytecodes, false, \
"Force verification of 1.4 reflection bytecodes. Does not work " \
"in situations like that described in 4486457 or for " \
"constructors generated for serialization, so can not be enabled "\
"in product.") \
\
product(bool, ReflectionWrapResolutionErrors, true, \
"Temporary flag for transition to AbstractMethodError wrapped " \
"in InvocationTargetException. See 6531596") \
\
develop(intx, FastSuperclassLimit, 8, \
"Depth of hardwired instanceof accelerator array") \
\
/* Properties for Java libraries */ \
\
product(uintx, MaxDirectMemorySize, 0, \
"Maximum total size of NIO direct-buffer allocations") \
\
/* temporary developer defined flags */ \
\
diagnostic(bool, UseNewCode, false, \
"Testing Only: Use the new version while testing") \
\
diagnostic(bool, UseNewCode2, false, \
"Testing Only: Use the new version while testing") \
\
diagnostic(bool, UseNewCode3, false, \
"Testing Only: Use the new version while testing") \
\
/* flags for performance data collection */ \
\
product(bool, UsePerfData, falseInEmbedded, \
"Flag to disable jvmstat instrumentation for performance testing "\
"and problem isolation purposes") \
\
product(bool, PerfDataSaveToFile, false, \
"Save PerfData memory to hsperfdata_<pid> file on exit") \
\
product(ccstr, PerfDataSaveFile, NULL, \
"Save PerfData memory to the specified absolute pathname. " \
"The string %p in the file name (if present) " \
"will be replaced by pid") \
\
product(intx, PerfDataSamplingInterval, 50, \
"Data sampling interval (in milliseconds)") \
\
develop(bool, PerfTraceDataCreation, false, \
"Trace creation of Performance Data Entries") \
\
develop(bool, PerfTraceMemOps, false, \
"Trace PerfMemory create/attach/detach calls") \
\
product(bool, PerfDisableSharedMem, false, \
"Store performance data in standard memory") \
\
product(intx, PerfDataMemorySize, 32*K, \
"Size of performance data memory region. Will be rounded " \
"up to a multiple of the native os page size.") \
\
product(intx, PerfMaxStringConstLength, 1024, \
"Maximum PerfStringConstant string length before truncation") \
\
product(bool, PerfAllowAtExitRegistration, false, \
"Allow registration of atexit() methods") \
\
product(bool, PerfBypassFileSystemCheck, false, \
"Bypass Win32 file system criteria checks (Windows Only)") \
\
product(intx, UnguardOnExecutionViolation, 0, \
"Unguard page and retry on no-execute fault (Win32 only) " \
"0=off, 1=conservative, 2=aggressive") \
\
/* Serviceability Support */ \
\
product(bool, ManagementServer, false, \
"Create JMX Management Server") \
\
product(bool, DisableAttachMechanism, false, \
"Disable mechanism that allows tools to attach to this VM") \
\
product(bool, StartAttachListener, false, \
"Always start Attach Listener at VM startup") \
\
manageable(bool, PrintConcurrentLocks, false, \
"Print java.util.concurrent locks in thread dump") \
\
product(bool, TransmitErrorReport, false, \
"Enable error report transmission on erroneous termination") \
\
product(ccstr, ErrorReportServer, NULL, \
"Override built-in error report server address") \
\
/* Shared spaces */ \
\
product(bool, UseSharedSpaces, true, \
"Use shared spaces for metadata") \
\
product(bool, RequireSharedSpaces, false, \
"Require shared spaces for metadata") \
\
product(bool, DumpSharedSpaces, false, \
"Special mode: JVM reads a class list, loads classes, builds " \
"shared spaces, and dumps the shared spaces to a file to be " \
"used in future JVM runs") \
\
product(bool, PrintSharedSpaces, false, \
"Print usage of shared spaces") \
\
product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \
"Size of read-write space for metadata (in bytes)") \
\
product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \
"Size of read-only space for metadata (in bytes)") \
\
product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \
"Size of the shared miscellaneous data area (in bytes)") \
\
product(uintx, SharedMiscCodeSize, 120*K, \
"Size of the shared miscellaneous code area (in bytes)") \
\
product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \
NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
"Address to allocate shared memory region for class data") \
\
diagnostic(bool, EnableInvokeDynamic, true, \
"support JSR 292 (method handles, invokedynamic, " \
"anonymous classes") \
\
diagnostic(bool, PrintMethodHandleStubs, false, \
"Print generated stub code for method handles") \
\
develop(bool, TraceMethodHandles, false, \
"trace internal method handle operations") \
\
diagnostic(bool, VerifyMethodHandles, trueInDebug, \
"perform extra checks when constructing method handles") \
\
diagnostic(bool, ShowHiddenFrames, false, \
"show method handle implementation frames (usually hidden)") \
\
experimental(bool, TrustFinalNonStaticFields, false, \
"trust final non-static declarations for constant folding") \
\
experimental(bool, FoldStableValues, false, \
"Private flag to control optimizations for stable variables") \
\
develop(bool, TraceInvokeDynamic, false, \
"trace internal invoke dynamic operations") \
\
diagnostic(bool, PauseAtStartup, false, \
"Causes the VM to pause at startup time and wait for the pause " \
"file to be removed (default: ./vm.paused.<pid>)") \
\
diagnostic(ccstr, PauseAtStartupFile, NULL, \
"The file to create and for whose removal to await when pausing " \
"at startup. (default: ./vm.paused.<pid>)") \
\
diagnostic(bool, PauseAtExit, false, \
"Pause and wait for keypress on exit if a debugger is attached") \
\
product(bool, ExtendedDTraceProbes, false, \
"Enable performance-impacting dtrace probes") \
\
product(bool, DTraceMethodProbes, false, \
"Enable dtrace probes for method-entry and method-exit") \
\
product(bool, DTraceAllocProbes, false, \
"Enable dtrace probes for object allocation") \
\
product(bool, DTraceMonitorProbes, false, \
"Enable dtrace probes for monitor events") \
\
product(bool, RelaxAccessControlCheck, false, \
"Relax the access control checks in the verifier") \
\
diagnostic(bool, PrintDTraceDOF, false, \
"Print the DTrace DOF passed to the system for JSDT probes") \
\
product(uintx, StringTableSize, defaultStringTableSize, \
"Number of buckets in the interned String table") \
\
experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
"Number of buckets in the JVM internal Symbol table") \
\
develop(bool, TraceDefaultMethods, false, \
"Trace the default method processing steps") \
\
develop(bool, VerifyGenericSignatures, false, \
"Abort VM on erroneous or inconsistent generic signatures") \
\
product(bool, UseVMInterruptibleIO, false, \
"(Unstable, Solaris-specific) Thread interrupt before or with " \
"EINTR for I/O operations results in OS_INTRPT. The default " \
"value of this flag is true for JDK 6 and earlier") \
\
diagnostic(bool, WhiteBoxAPI, false, \
"Enable internal testing APIs") \
\
product(bool, PrintGCCause, true, \
"Include GC cause in GC logging") \
\
product(bool , AllowNonVirtualCalls, false, \
"Obey the ACC_SUPER flag and allow invokenonvirtual calls") \
\
diagnostic(ccstr, SharedArchiveFile, NULL, \
"Override the default location of the CDS archive file") \
\
experimental(uintx, ArrayAllocatorMallocLimit, \
SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \
"Allocation less than this value will be allocated " \
"using malloc. Larger allocations will use mmap.") \
\
product(bool, EnableTracing, false, \
"Enable event-based tracing") \
\
product(bool, UseLockedTracing, false, \
"Use locked-tracing when doing event-based tracing")
/*
* Macros for factoring of globals
*/
// Interface macros
#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
#ifdef PRODUCT
#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value;
#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name;
#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name;
#else
#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
#endif
// Special LP64 flags, product only needed for now.
#ifdef _LP64
#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
#else
#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
#endif // _LP64
// Implementation macros
#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
#ifdef PRODUCT
#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value;
#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name;
#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value;
#else
#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name;
#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
#endif
#ifdef _LP64
#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
#else
#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
#endif // _LP64
RUNTIME_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)
RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
// Extensions
#include "runtime/globals_ext.hpp"
#endif // SHARE_VM_RUNTIME_GLOBALS_HPP
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