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view src/share/vm/runtime/vm_operations.hpp @ 3979:4dfb2df418f2
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
author | johnc |
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date | Thu, 22 Sep 2011 10:57:37 -0700 |
parents | 1d1603768966 |
children | 94ec88ca68e2 |
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/* * Copyright (c) 1997, 2011, 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_VM_OPERATIONS_HPP #define SHARE_VM_RUNTIME_VM_OPERATIONS_HPP #include "classfile/javaClasses.hpp" #include "memory/allocation.hpp" #include "oops/oop.hpp" #include "runtime/thread.hpp" #include "utilities/top.hpp" // The following classes are used for operations // initiated by a Java thread but that must // take place in the VMThread. #define VM_OP_ENUM(type) VMOp_##type, // Note: When new VM_XXX comes up, add 'XXX' to the template table. #define VM_OPS_DO(template) \ template(Dummy) \ template(ThreadStop) \ template(ThreadDump) \ template(PrintThreads) \ template(FindDeadlocks) \ template(ForceSafepoint) \ template(ForceAsyncSafepoint) \ template(Deoptimize) \ template(DeoptimizeFrame) \ template(DeoptimizeAll) \ template(ZombieAll) \ template(UnlinkSymbols) \ template(HandleFullCodeCache) \ template(Verify) \ template(PrintJNI) \ template(HeapDumper) \ template(DeoptimizeTheWorld) \ template(GC_HeapInspection) \ template(GenCollectFull) \ template(GenCollectFullConcurrent) \ template(GenCollectForAllocation) \ template(GenCollectForPermanentAllocation) \ template(ParallelGCFailedAllocation) \ template(ParallelGCFailedPermanentAllocation) \ template(ParallelGCSystemGC) \ template(CGC_Operation) \ template(CMS_Initial_Mark) \ template(CMS_Final_Remark) \ template(G1CollectFull) \ template(G1CollectForAllocation) \ template(G1IncCollectionPause) \ template(EnableBiasedLocking) \ template(RevokeBias) \ template(BulkRevokeBias) \ template(PopulateDumpSharedSpace) \ template(JNIFunctionTableCopier) \ template(RedefineClasses) \ template(GetOwnedMonitorInfo) \ template(GetObjectMonitorUsage) \ template(GetCurrentContendedMonitor) \ template(GetStackTrace) \ template(GetMultipleStackTraces) \ template(GetAllStackTraces) \ template(GetThreadListStackTraces) \ template(GetFrameCount) \ template(GetFrameLocation) \ template(ChangeBreakpoints) \ template(GetOrSetLocal) \ template(GetCurrentLocation) \ template(EnterInterpOnlyMode) \ template(ChangeSingleStep) \ template(HeapWalkOperation) \ template(HeapIterateOperation) \ template(ReportJavaOutOfMemory) \ template(Exit) \ class VM_Operation: public CHeapObj { public: enum Mode { _safepoint, // blocking, safepoint, vm_op C-heap allocated _no_safepoint, // blocking, no safepoint, vm_op C-Heap allocated _concurrent, // non-blocking, no safepoint, vm_op C-Heap allocated _async_safepoint // non-blocking, safepoint, vm_op C-Heap allocated }; enum VMOp_Type { VM_OPS_DO(VM_OP_ENUM) VMOp_Terminating }; private: Thread* _calling_thread; ThreadPriority _priority; long _timestamp; VM_Operation* _next; VM_Operation* _prev; // The VM operation name array static const char* _names[]; public: VM_Operation() { _calling_thread = NULL; _next = NULL; _prev = NULL; } virtual ~VM_Operation() {} // VM operation support (used by VM thread) Thread* calling_thread() const { return _calling_thread; } ThreadPriority priority() { return _priority; } void set_calling_thread(Thread* thread, ThreadPriority priority); long timestamp() const { return _timestamp; } void set_timestamp(long timestamp) { _timestamp = timestamp; } // Called by VM thread - does in turn invoke doit(). Do not override this void evaluate(); // evaluate() is called by the VMThread and in turn calls doit(). // If the thread invoking VMThread::execute((VM_Operation*) is a JavaThread, // doit_prologue() is called in that thread before transferring control to // the VMThread. // If doit_prologue() returns true the VM operation will proceed, and // doit_epilogue() will be called by the JavaThread once the VM operation // completes. If doit_prologue() returns false the VM operation is cancelled. virtual void doit() = 0; virtual bool doit_prologue() { return true; }; virtual void doit_epilogue() {}; // Note: Not called if mode is: _concurrent // Type test virtual bool is_methodCompiler() const { return false; } // Linking VM_Operation *next() const { return _next; } VM_Operation *prev() const { return _prev; } void set_next(VM_Operation *next) { _next = next; } void set_prev(VM_Operation *prev) { _prev = prev; } // Configuration. Override these appropriatly in subclasses. virtual VMOp_Type type() const = 0; virtual Mode evaluation_mode() const { return _safepoint; } virtual bool allow_nested_vm_operations() const { return false; } virtual bool is_cheap_allocated() const { return false; } virtual void oops_do(OopClosure* f) { /* do nothing */ }; // CAUTION: <don't hang yourself with following rope> // If you override these methods, make sure that the evaluation // of these methods is race-free and non-blocking, since these // methods may be evaluated either by the mutators or by the // vm thread, either concurrently with mutators or with the mutators // stopped. In other words, taking locks is verboten, and if there // are any races in evaluating the conditions, they'd better be benign. virtual bool evaluate_at_safepoint() const { return evaluation_mode() == _safepoint || evaluation_mode() == _async_safepoint; } virtual bool evaluate_concurrently() const { return evaluation_mode() == _concurrent || evaluation_mode() == _async_safepoint; } // Debugging void print_on_error(outputStream* st) const; const char* name() const { return _names[type()]; } static const char* name(int type) { assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type"); return _names[type]; } #ifndef PRODUCT void print_on(outputStream* st) const { print_on_error(st); } #endif }; class VM_ThreadStop: public VM_Operation { private: oop _thread; // The Thread that the Throwable is thrown against oop _throwable; // The Throwable thrown at the target Thread public: // All oops are passed as JNI handles, since there is no guarantee that a GC might happen before the // VM operation is executed. VM_ThreadStop(oop thread, oop throwable) { _thread = thread; _throwable = throwable; } VMOp_Type type() const { return VMOp_ThreadStop; } oop target_thread() const { return _thread; } oop throwable() const { return _throwable;} void doit(); // We deoptimize if top-most frame is compiled - this might require a C2I adapter to be generated bool allow_nested_vm_operations() const { return true; } Mode evaluation_mode() const { return _async_safepoint; } bool is_cheap_allocated() const { return true; } // GC support void oops_do(OopClosure* f) { f->do_oop(&_thread); f->do_oop(&_throwable); } }; // dummy vm op, evaluated just to force a safepoint class VM_ForceSafepoint: public VM_Operation { public: VM_ForceSafepoint() {} void doit() {} VMOp_Type type() const { return VMOp_ForceSafepoint; } }; // dummy vm op, evaluated just to force a safepoint class VM_ForceAsyncSafepoint: public VM_Operation { public: VM_ForceAsyncSafepoint() {} void doit() {} VMOp_Type type() const { return VMOp_ForceAsyncSafepoint; } Mode evaluation_mode() const { return _async_safepoint; } bool is_cheap_allocated() const { return true; } }; class VM_Deoptimize: public VM_Operation { public: VM_Deoptimize() {} VMOp_Type type() const { return VMOp_Deoptimize; } void doit(); bool allow_nested_vm_operations() const { return true; } }; // Deopt helper that can deoptimize frames in threads other than the // current thread. Only used through Deoptimization::deoptimize_frame. class VM_DeoptimizeFrame: public VM_Operation { friend class Deoptimization; private: JavaThread* _thread; intptr_t* _id; VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id); public: VMOp_Type type() const { return VMOp_DeoptimizeFrame; } void doit(); bool allow_nested_vm_operations() const { return true; } }; class VM_HandleFullCodeCache: public VM_Operation { private: bool _is_full; public: VM_HandleFullCodeCache(bool is_full) { _is_full = is_full; } VMOp_Type type() const { return VMOp_HandleFullCodeCache; } void doit(); bool allow_nested_vm_operations() const { return true; } }; #ifndef PRODUCT class VM_DeoptimizeAll: public VM_Operation { private: KlassHandle _dependee; public: VM_DeoptimizeAll() {} VMOp_Type type() const { return VMOp_DeoptimizeAll; } void doit(); bool allow_nested_vm_operations() const { return true; } }; class VM_ZombieAll: public VM_Operation { public: VM_ZombieAll() {} VMOp_Type type() const { return VMOp_ZombieAll; } void doit(); bool allow_nested_vm_operations() const { return true; } }; #endif // PRODUCT class VM_UnlinkSymbols: public VM_Operation { public: VM_UnlinkSymbols() {} VMOp_Type type() const { return VMOp_UnlinkSymbols; } void doit(); bool allow_nested_vm_operations() const { return true; } }; class VM_Verify: public VM_Operation { private: KlassHandle _dependee; public: VM_Verify() {} VMOp_Type type() const { return VMOp_Verify; } void doit(); }; class VM_PrintThreads: public VM_Operation { private: outputStream* _out; bool _print_concurrent_locks; public: VM_PrintThreads() { _out = tty; _print_concurrent_locks = PrintConcurrentLocks; } VM_PrintThreads(outputStream* out, bool print_concurrent_locks) { _out = out; _print_concurrent_locks = print_concurrent_locks; } VMOp_Type type() const { return VMOp_PrintThreads; } void doit(); bool doit_prologue(); void doit_epilogue(); }; class VM_PrintJNI: public VM_Operation { private: outputStream* _out; public: VM_PrintJNI() { _out = tty; } VM_PrintJNI(outputStream* out) { _out = out; } VMOp_Type type() const { return VMOp_PrintJNI; } void doit(); }; class DeadlockCycle; class VM_FindDeadlocks: public VM_Operation { private: bool _concurrent_locks; DeadlockCycle* _deadlocks; outputStream* _out; public: VM_FindDeadlocks(bool concurrent_locks) : _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL) {}; VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _out(st), _deadlocks(NULL) {}; ~VM_FindDeadlocks(); DeadlockCycle* result() { return _deadlocks; }; VMOp_Type type() const { return VMOp_FindDeadlocks; } void doit(); bool doit_prologue(); }; class ThreadDumpResult; class ThreadSnapshot; class ThreadConcurrentLocks; class VM_ThreadDump : public VM_Operation { private: ThreadDumpResult* _result; int _num_threads; GrowableArray<instanceHandle>* _threads; int _max_depth; bool _with_locked_monitors; bool _with_locked_synchronizers; ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl); public: VM_ThreadDump(ThreadDumpResult* result, int max_depth, // -1 indicates entire stack bool with_locked_monitors, bool with_locked_synchronizers); VM_ThreadDump(ThreadDumpResult* result, GrowableArray<instanceHandle>* threads, int num_threads, // -1 indicates entire stack int max_depth, bool with_locked_monitors, bool with_locked_synchronizers); VMOp_Type type() const { return VMOp_ThreadDump; } void doit(); bool doit_prologue(); void doit_epilogue(); }; class VM_Exit: public VM_Operation { private: int _exit_code; static volatile bool _vm_exited; static Thread * _shutdown_thread; static void wait_if_vm_exited(); public: VM_Exit(int exit_code) { _exit_code = exit_code; } static int wait_for_threads_in_native_to_block(); static int set_vm_exited(); static bool vm_exited() { return _vm_exited; } static void block_if_vm_exited() { if (_vm_exited) { wait_if_vm_exited(); } } VMOp_Type type() const { return VMOp_Exit; } void doit(); }; #endif // SHARE_VM_RUNTIME_VM_OPERATIONS_HPP