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dfc84e8c89
G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset. Reviewed-by: iveresov, ysr, johnc
288 lines
13 KiB
C++
288 lines
13 KiB
C++
/*
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* Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "incls/_precompiled.incl"
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#include "incls/_mutexLocker.cpp.incl"
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// Mutexes used in the VM (see comment in mutexLocker.hpp):
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//
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// Note that the following pointers are effectively final -- after having been
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// set at JVM startup-time, they should never be subsequently mutated.
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// Instead of using pointers to malloc()ed monitors and mutexes we should consider
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// eliminating the indirection and using instances instead.
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// Consider using GCC's __read_mostly.
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Mutex* Patching_lock = NULL;
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Monitor* SystemDictionary_lock = NULL;
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Mutex* PackageTable_lock = NULL;
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Mutex* CompiledIC_lock = NULL;
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Mutex* InlineCacheBuffer_lock = NULL;
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Mutex* VMStatistic_lock = NULL;
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Mutex* JNIGlobalHandle_lock = NULL;
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Mutex* JNIHandleBlockFreeList_lock = NULL;
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Mutex* JNICachedItableIndex_lock = NULL;
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Mutex* JmethodIdCreation_lock = NULL;
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Mutex* JfieldIdCreation_lock = NULL;
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Monitor* JNICritical_lock = NULL;
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Mutex* JvmtiThreadState_lock = NULL;
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Monitor* JvmtiPendingEvent_lock = NULL;
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Monitor* Heap_lock = NULL;
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Mutex* ExpandHeap_lock = NULL;
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Mutex* AdapterHandlerLibrary_lock = NULL;
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Mutex* SignatureHandlerLibrary_lock = NULL;
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Mutex* VtableStubs_lock = NULL;
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Mutex* SymbolTable_lock = NULL;
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Mutex* StringTable_lock = NULL;
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Mutex* CodeCache_lock = NULL;
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Mutex* MethodData_lock = NULL;
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Mutex* RetData_lock = NULL;
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Monitor* VMOperationQueue_lock = NULL;
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Monitor* VMOperationRequest_lock = NULL;
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Monitor* Safepoint_lock = NULL;
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Monitor* SerializePage_lock = NULL;
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Monitor* Threads_lock = NULL;
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Monitor* CGC_lock = NULL;
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Mutex* STS_init_lock = NULL;
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Monitor* SLT_lock = NULL;
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Monitor* iCMS_lock = NULL;
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Monitor* FullGCCount_lock = NULL;
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Monitor* CMark_lock = NULL;
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Monitor* ZF_mon = NULL;
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Monitor* Cleanup_mon = NULL;
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Mutex* CMRegionStack_lock = NULL;
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Mutex* SATB_Q_FL_lock = NULL;
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Monitor* SATB_Q_CBL_mon = NULL;
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Mutex* Shared_SATB_Q_lock = NULL;
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Mutex* DirtyCardQ_FL_lock = NULL;
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Monitor* DirtyCardQ_CBL_mon = NULL;
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Mutex* Shared_DirtyCardQ_lock = NULL;
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Mutex* ParGCRareEvent_lock = NULL;
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Mutex* EvacFailureStack_lock = NULL;
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Mutex* DerivedPointerTableGC_lock = NULL;
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Mutex* Compile_lock = NULL;
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Monitor* MethodCompileQueue_lock = NULL;
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Monitor* CompileThread_lock = NULL;
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Mutex* CompileTaskAlloc_lock = NULL;
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Mutex* CompileStatistics_lock = NULL;
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Mutex* MultiArray_lock = NULL;
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Monitor* Terminator_lock = NULL;
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Monitor* BeforeExit_lock = NULL;
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Monitor* Notify_lock = NULL;
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Monitor* Interrupt_lock = NULL;
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Monitor* ProfileVM_lock = NULL;
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Mutex* ProfilePrint_lock = NULL;
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Mutex* ExceptionCache_lock = NULL;
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Monitor* ObjAllocPost_lock = NULL;
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Mutex* OsrList_lock = NULL;
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#ifndef PRODUCT
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Mutex* FullGCALot_lock = NULL;
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#endif
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Mutex* Debug1_lock = NULL;
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Mutex* Debug2_lock = NULL;
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Mutex* Debug3_lock = NULL;
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Mutex* tty_lock = NULL;
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Mutex* RawMonitor_lock = NULL;
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Mutex* PerfDataMemAlloc_lock = NULL;
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Mutex* PerfDataManager_lock = NULL;
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Mutex* OopMapCacheAlloc_lock = NULL;
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Mutex* MMUTracker_lock = NULL;
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Mutex* HotCardCache_lock = NULL;
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Monitor* GCTaskManager_lock = NULL;
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Mutex* Management_lock = NULL;
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Monitor* LowMemory_lock = NULL;
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#define MAX_NUM_MUTEX 128
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static Monitor * _mutex_array[MAX_NUM_MUTEX];
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static int _num_mutex;
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#ifdef ASSERT
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void assert_locked_or_safepoint(const Monitor * lock) {
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// check if this thread owns the lock (common case)
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if (IgnoreLockingAssertions) return;
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assert(lock != NULL, "Need non-NULL lock");
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if (lock->owned_by_self()) return;
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if (SafepointSynchronize::is_at_safepoint()) return;
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if (!Universe::is_fully_initialized()) return;
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// see if invoker of VM operation owns it
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VM_Operation* op = VMThread::vm_operation();
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if (op != NULL && op->calling_thread() == lock->owner()) return;
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fatal(err_msg("must own lock %s", lock->name()));
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}
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// a stronger assertion than the above
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void assert_lock_strong(const Monitor * lock) {
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if (IgnoreLockingAssertions) return;
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assert(lock != NULL, "Need non-NULL lock");
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if (lock->owned_by_self()) return;
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fatal(err_msg("must own lock %s", lock->name()));
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}
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#endif
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#define def(var, type, pri, vm_block) { \
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var = new type(Mutex::pri, #var, vm_block); \
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assert(_num_mutex < MAX_NUM_MUTEX, \
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"increase MAX_NUM_MUTEX"); \
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_mutex_array[_num_mutex++] = var; \
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}
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void mutex_init() {
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def(tty_lock , Mutex , event, true ); // allow to lock in VM
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def(CGC_lock , Monitor, special, true ); // coordinate between fore- and background GC
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def(STS_init_lock , Mutex, leaf, true );
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if (UseConcMarkSweepGC) {
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def(iCMS_lock , Monitor, special, true ); // CMS incremental mode start/stop notification
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}
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if (UseConcMarkSweepGC || UseG1GC) {
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def(FullGCCount_lock , Monitor, leaf, true ); // in support of ExplicitGCInvokesConcurrent
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}
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if (UseG1GC) {
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def(CMark_lock , Monitor, nonleaf, true ); // coordinate concurrent mark thread
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def(ZF_mon , Monitor, leaf, true );
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def(Cleanup_mon , Monitor, nonleaf, true );
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def(CMRegionStack_lock , Mutex, leaf, true );
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def(SATB_Q_FL_lock , Mutex , special, true );
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def(SATB_Q_CBL_mon , Monitor, nonleaf, true );
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def(Shared_SATB_Q_lock , Mutex, nonleaf, true );
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def(DirtyCardQ_FL_lock , Mutex , special, true );
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def(DirtyCardQ_CBL_mon , Monitor, nonleaf, true );
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def(Shared_DirtyCardQ_lock , Mutex, nonleaf, true );
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def(MMUTracker_lock , Mutex , leaf , true );
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def(HotCardCache_lock , Mutex , special , true );
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def(EvacFailureStack_lock , Mutex , nonleaf , true );
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}
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def(ParGCRareEvent_lock , Mutex , leaf , true );
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def(DerivedPointerTableGC_lock , Mutex, leaf, true );
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def(CodeCache_lock , Mutex , special, true );
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def(Interrupt_lock , Monitor, special, true ); // used for interrupt processing
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def(RawMonitor_lock , Mutex, special, true );
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def(OopMapCacheAlloc_lock , Mutex, leaf, true ); // used for oop_map_cache allocation.
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def(Patching_lock , Mutex , special, true ); // used for safepointing and code patching.
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def(ObjAllocPost_lock , Monitor, special, false);
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def(LowMemory_lock , Monitor, special, true ); // used for low memory detection
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def(JmethodIdCreation_lock , Mutex , leaf, true ); // used for creating jmethodIDs.
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def(SystemDictionary_lock , Monitor, leaf, true ); // lookups done by VM thread
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def(PackageTable_lock , Mutex , leaf, false);
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def(InlineCacheBuffer_lock , Mutex , leaf, true );
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def(VMStatistic_lock , Mutex , leaf, false);
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def(ExpandHeap_lock , Mutex , leaf, true ); // Used during compilation by VM thread
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def(JNIHandleBlockFreeList_lock , Mutex , leaf, true ); // handles are used by VM thread
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def(SignatureHandlerLibrary_lock , Mutex , leaf, false);
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def(SymbolTable_lock , Mutex , leaf, true );
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def(StringTable_lock , Mutex , leaf, true );
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def(ProfilePrint_lock , Mutex , leaf, false); // serial profile printing
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def(ExceptionCache_lock , Mutex , leaf, false); // serial profile printing
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def(OsrList_lock , Mutex , leaf, true );
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def(Debug1_lock , Mutex , leaf, true );
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#ifndef PRODUCT
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def(FullGCALot_lock , Mutex , leaf, false); // a lock to make FullGCALot MT safe
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#endif
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def(BeforeExit_lock , Monitor, leaf, true );
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def(PerfDataMemAlloc_lock , Mutex , leaf, true ); // used for allocating PerfData memory for performance data
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def(PerfDataManager_lock , Mutex , leaf, true ); // used for synchronized access to PerfDataManager resources
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// CMS_modUnionTable_lock leaf
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// CMS_bitMap_lock leaf + 1
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// CMS_freeList_lock leaf + 2
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def(Safepoint_lock , Monitor, safepoint, true ); // locks SnippetCache_lock/Threads_lock
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def(Threads_lock , Monitor, barrier, true );
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def(VMOperationQueue_lock , Monitor, nonleaf, true ); // VM_thread allowed to block on these
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def(VMOperationRequest_lock , Monitor, nonleaf, true );
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def(RetData_lock , Mutex , nonleaf, false);
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def(Terminator_lock , Monitor, nonleaf, true );
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def(VtableStubs_lock , Mutex , nonleaf, true );
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def(Notify_lock , Monitor, nonleaf, true );
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def(JNIGlobalHandle_lock , Mutex , nonleaf, true ); // locks JNIHandleBlockFreeList_lock
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def(JNICritical_lock , Monitor, nonleaf, true ); // used for JNI critical regions
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def(AdapterHandlerLibrary_lock , Mutex , nonleaf, true);
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if (UseConcMarkSweepGC) {
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def(SLT_lock , Monitor, nonleaf, false );
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// used in CMS GC for locking PLL lock
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}
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def(Heap_lock , Monitor, nonleaf+1, false);
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def(JfieldIdCreation_lock , Mutex , nonleaf+1, true ); // jfieldID, Used in VM_Operation
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def(JNICachedItableIndex_lock , Mutex , nonleaf+1, false); // Used to cache an itable index during JNI invoke
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def(CompiledIC_lock , Mutex , nonleaf+2, false); // locks VtableStubs_lock, InlineCacheBuffer_lock
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def(CompileTaskAlloc_lock , Mutex , nonleaf+2, true );
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def(CompileStatistics_lock , Mutex , nonleaf+2, false);
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def(MultiArray_lock , Mutex , nonleaf+2, false); // locks SymbolTable_lock
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def(JvmtiThreadState_lock , Mutex , nonleaf+2, false); // Used by JvmtiThreadState/JvmtiEventController
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def(JvmtiPendingEvent_lock , Monitor, nonleaf, false); // Used by JvmtiCodeBlobEvents
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def(Management_lock , Mutex , nonleaf+2, false); // used for JVM management
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def(Compile_lock , Mutex , nonleaf+3, true );
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def(MethodData_lock , Mutex , nonleaf+3, false);
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def(MethodCompileQueue_lock , Monitor, nonleaf+4, true );
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def(Debug2_lock , Mutex , nonleaf+4, true );
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def(Debug3_lock , Mutex , nonleaf+4, true );
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def(ProfileVM_lock , Monitor, nonleaf+4, false); // used for profiling of the VMThread
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def(CompileThread_lock , Monitor, nonleaf+5, false );
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}
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GCMutexLocker::GCMutexLocker(Monitor * mutex) {
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if (SafepointSynchronize::is_at_safepoint()) {
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_locked = false;
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} else {
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_mutex = mutex;
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_locked = true;
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_mutex->lock();
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}
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}
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// Print all mutexes/monitors that are currently owned by a thread; called
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// by fatal error handler.
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void print_owned_locks_on_error(outputStream* st) {
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st->print("VM Mutex/Monitor currently owned by a thread: ");
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bool none = true;
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for (int i = 0; i < _num_mutex; i++) {
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// see if it has an owner
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if (_mutex_array[i]->owner() != NULL) {
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if (none) {
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// print format used by Mutex::print_on_error()
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st->print_cr(" ([mutex/lock_event])");
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none = false;
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}
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_mutex_array[i]->print_on_error(st);
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st->cr();
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}
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}
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if (none) st->print_cr("None");
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}
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