hotspot/src/share/vm/runtime/mutexLocker.cpp
author mdoerr
Wed, 12 Oct 2016 10:41:00 +0200
changeset 41710 b830f5141dbb
parent 41176 ff9f64534cff
child 46304 8d4d88f90669
child 44316 a0f13c798ee1
permissions -rw-r--r--
8166970: Adapt mutex padding according to DEFAULT_CACHE_LINE_SIZE Reviewed-by: coleenp, dholmes, dcubed, redestad
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/*
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 * Copyright (c) 1997, 2016, 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 "precompiled.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/os.inline.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/thread.inline.hpp"
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#include "runtime/vmThread.hpp"
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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*   Module_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*   MemberNameTable_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* 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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Monitor* StringDedupQueue_lock        = NULL;
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Mutex*   StringDedupTable_lock        = NULL;
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Monitor* CodeCache_lock               = NULL;
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Mutex*   MethodData_lock              = NULL;
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Mutex*   TouchedMethodLog_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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Monitor* STS_lock                     = NULL;
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Monitor* FullGCCount_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*   MarkStackFreeList_lock       = NULL;
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Mutex*   MarkStackChunkList_lock      = NULL;
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Mutex*   ParGCRareEvent_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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Monitor* Compilation_lock             = NULL;
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Mutex*   CompileTaskAlloc_lock        = NULL;
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Mutex*   CompileStatistics_lock       = NULL;
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Mutex*   DirectivesStack_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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Mutex*   ProfilePrint_lock            = NULL;
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Mutex*   ExceptionCache_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*   FreeList_lock                = NULL;
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Monitor* SecondaryFreeList_lock       = NULL;
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Mutex*   OldSets_lock                 = NULL;
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Monitor* RootRegionScan_lock          = NULL;
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Mutex*   MMUTracker_lock              = NULL;
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Monitor* GCTaskManager_lock           = NULL;
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Mutex*   Management_lock              = NULL;
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Monitor* Service_lock                 = NULL;
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Monitor* PeriodicTask_lock            = NULL;
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Monitor* RedefineClasses_lock         = NULL;
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#ifdef INCLUDE_TRACE
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Mutex*   JfrStacktrace_lock           = NULL;
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Monitor* JfrMsg_lock                  = NULL;
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Mutex*   JfrBuffer_lock               = NULL;
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Mutex*   JfrStream_lock               = NULL;
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Mutex*   JfrThreadGroups_lock         = NULL;
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#endif
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#ifndef SUPPORTS_NATIVE_CX8
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Mutex*   UnsafeJlong_lock             = NULL;
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#endif
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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("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("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, safepoint_check_allowed ) {      \
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  var = new type(Mutex::pri, #var, vm_block, safepoint_check_allowed); \
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  assert(_num_mutex < MAX_NUM_MUTEX, "increase MAX_NUM_MUTEX");        \
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  _mutex_array[_num_mutex++] = var;                                      \
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}
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// Using Padded subclasses to prevent false sharing of these global monitors and mutexes.
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void mutex_init() {
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  def(tty_lock                     , PaddedMutex  , event,       true,  Monitor::_safepoint_check_never);      // allow to lock in VM
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  def(CGC_lock                     , PaddedMonitor, special,     true,  Monitor::_safepoint_check_never);      // coordinate between fore- and background GC
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  def(STS_lock                     , PaddedMonitor, leaf,        true,  Monitor::_safepoint_check_never);
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  if (UseConcMarkSweepGC || UseG1GC) {
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    def(FullGCCount_lock           , PaddedMonitor, leaf,        true,  Monitor::_safepoint_check_never);      // in support of ExplicitGCInvokesConcurrent
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  }
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  if (UseG1GC) {
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    def(SATB_Q_FL_lock             , PaddedMutex  , special,     true,  Monitor::_safepoint_check_never);
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    def(SATB_Q_CBL_mon             , PaddedMonitor, nonleaf,     true,  Monitor::_safepoint_check_never);
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    def(Shared_SATB_Q_lock         , PaddedMutex  , nonleaf,     true,  Monitor::_safepoint_check_never);
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    def(DirtyCardQ_FL_lock         , PaddedMutex  , special,     true,  Monitor::_safepoint_check_never);
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    def(DirtyCardQ_CBL_mon         , PaddedMonitor, nonleaf,     true,  Monitor::_safepoint_check_never);
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    def(Shared_DirtyCardQ_lock     , PaddedMutex  , nonleaf,     true,  Monitor::_safepoint_check_never);
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    def(FreeList_lock              , PaddedMutex  , leaf     ,   true,  Monitor::_safepoint_check_never);
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    def(SecondaryFreeList_lock     , PaddedMonitor, leaf     ,   true,  Monitor::_safepoint_check_never);
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    def(OldSets_lock               , PaddedMutex  , leaf     ,   true,  Monitor::_safepoint_check_never);
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    def(RootRegionScan_lock        , PaddedMonitor, leaf     ,   true,  Monitor::_safepoint_check_never);
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    def(MMUTracker_lock            , PaddedMutex  , leaf     ,   true,  Monitor::_safepoint_check_never);
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    def(StringDedupQueue_lock      , PaddedMonitor, leaf,        true,  Monitor::_safepoint_check_never);
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    def(StringDedupTable_lock      , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_never);
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    def(MarkStackFreeList_lock     , PaddedMutex  , leaf     ,   true,  Monitor::_safepoint_check_never);
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    def(MarkStackChunkList_lock    , PaddedMutex  , leaf     ,   true,  Monitor::_safepoint_check_never);
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  }
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  def(ParGCRareEvent_lock          , PaddedMutex  , leaf     ,   true,  Monitor::_safepoint_check_sometimes);
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  def(DerivedPointerTableGC_lock   , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_never);
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  def(CodeCache_lock               , PaddedMutex  , special,     true,  Monitor::_safepoint_check_never);
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  def(RawMonitor_lock              , PaddedMutex  , special,     true,  Monitor::_safepoint_check_never);
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  def(OopMapCacheAlloc_lock        , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_always);     // used for oop_map_cache allocation.
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  def(Patching_lock                , PaddedMutex  , special,     true,  Monitor::_safepoint_check_never);      // used for safepointing and code patching.
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  def(Service_lock                 , PaddedMonitor, special,     true,  Monitor::_safepoint_check_never);      // used for service thread operations
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  def(JmethodIdCreation_lock       , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_always);     // used for creating jmethodIDs.
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  def(SystemDictionary_lock        , PaddedMonitor, leaf,        true,  Monitor::_safepoint_check_always);     // lookups done by VM thread
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  def(Module_lock                  , PaddedMutex  , leaf+2,      true,  Monitor::_safepoint_check_always);
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  def(InlineCacheBuffer_lock       , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_always);
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  def(VMStatistic_lock             , PaddedMutex  , leaf,        false, Monitor::_safepoint_check_always);
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  def(ExpandHeap_lock              , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_always);     // Used during compilation by VM thread
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  def(JNIHandleBlockFreeList_lock  , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_never);      // handles are used by VM thread
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  def(SignatureHandlerLibrary_lock , PaddedMutex  , leaf,        false, Monitor::_safepoint_check_always);
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  def(SymbolTable_lock             , PaddedMutex  , leaf+2,      true,  Monitor::_safepoint_check_always);
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  def(StringTable_lock             , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_always);
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  def(ProfilePrint_lock            , PaddedMutex  , leaf,        false, Monitor::_safepoint_check_always);     // serial profile printing
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  def(ExceptionCache_lock          , PaddedMutex  , leaf,        false, Monitor::_safepoint_check_always);     // serial profile printing
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  def(OsrList_lock                 , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_never);
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  def(Debug1_lock                  , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_never);
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#ifndef PRODUCT
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  def(FullGCALot_lock              , PaddedMutex  , leaf,        false, Monitor::_safepoint_check_always);     // a lock to make FullGCALot MT safe
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#endif
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  def(BeforeExit_lock              , PaddedMonitor, leaf,        true,  Monitor::_safepoint_check_always);
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  def(PerfDataMemAlloc_lock        , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_always);     // used for allocating PerfData memory for performance data
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  def(PerfDataManager_lock         , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_always);     // 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               , PaddedMonitor, safepoint,   true,  Monitor::_safepoint_check_sometimes);  // locks SnippetCache_lock/Threads_lock
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  def(Threads_lock                 , PaddedMonitor, barrier,     true,  Monitor::_safepoint_check_sometimes);
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  def(VMOperationQueue_lock        , PaddedMonitor, nonleaf,     true,  Monitor::_safepoint_check_sometimes);  // VM_thread allowed to block on these
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  def(VMOperationRequest_lock      , PaddedMonitor, nonleaf,     true,  Monitor::_safepoint_check_sometimes);
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  def(RetData_lock                 , PaddedMutex  , nonleaf,     false, Monitor::_safepoint_check_always);
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  def(Terminator_lock              , PaddedMonitor, nonleaf,     true,  Monitor::_safepoint_check_sometimes);
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  def(VtableStubs_lock             , PaddedMutex  , nonleaf,     true,  Monitor::_safepoint_check_always);
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  def(Notify_lock                  , PaddedMonitor, nonleaf,     true,  Monitor::_safepoint_check_always);
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  def(JNIGlobalHandle_lock         , PaddedMutex  , nonleaf,     true,  Monitor::_safepoint_check_always);     // locks JNIHandleBlockFreeList_lock
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  def(JNICritical_lock             , PaddedMonitor, nonleaf,     true,  Monitor::_safepoint_check_always);     // used for JNI critical regions
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  def(AdapterHandlerLibrary_lock   , PaddedMutex  , nonleaf,     true,  Monitor::_safepoint_check_always);
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  def(Heap_lock                    , PaddedMonitor, nonleaf+1,   false, Monitor::_safepoint_check_sometimes);
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  def(JfieldIdCreation_lock        , PaddedMutex  , nonleaf+1,   true,  Monitor::_safepoint_check_always);     // jfieldID, Used in VM_Operation
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  def(MemberNameTable_lock         , PaddedMutex  , nonleaf+1,   false, Monitor::_safepoint_check_always);     // Used to protect MemberNameTable
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  def(CompiledIC_lock              , PaddedMutex  , nonleaf+2,   false, Monitor::_safepoint_check_always);     // locks VtableStubs_lock, InlineCacheBuffer_lock
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  def(CompileTaskAlloc_lock        , PaddedMutex  , nonleaf+2,   true,  Monitor::_safepoint_check_always);
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  def(CompileStatistics_lock       , PaddedMutex  , nonleaf+2,   false, Monitor::_safepoint_check_always);
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  def(DirectivesStack_lock         , PaddedMutex  , special,     true,  Monitor::_safepoint_check_never);
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  def(MultiArray_lock              , PaddedMutex  , nonleaf+2,   false, Monitor::_safepoint_check_always);     // locks SymbolTable_lock
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  def(JvmtiThreadState_lock        , PaddedMutex  , nonleaf+2,   false, Monitor::_safepoint_check_always);     // Used by JvmtiThreadState/JvmtiEventController
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  def(Management_lock              , PaddedMutex  , nonleaf+2,   false, Monitor::_safepoint_check_always);     // used for JVM management
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  def(Compile_lock                 , PaddedMutex  , nonleaf+3,   true,  Monitor::_safepoint_check_sometimes);
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  def(MethodData_lock              , PaddedMutex  , nonleaf+3,   false, Monitor::_safepoint_check_always);
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  def(TouchedMethodLog_lock        , PaddedMutex  , nonleaf+3,   false, Monitor::_safepoint_check_always);
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  def(MethodCompileQueue_lock      , PaddedMonitor, nonleaf+4,   true,  Monitor::_safepoint_check_always);
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  def(Debug2_lock                  , PaddedMutex  , nonleaf+4,   true,  Monitor::_safepoint_check_never);
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  def(Debug3_lock                  , PaddedMutex  , nonleaf+4,   true,  Monitor::_safepoint_check_never);
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  def(CompileThread_lock           , PaddedMonitor, nonleaf+5,   false, Monitor::_safepoint_check_always);
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  def(PeriodicTask_lock            , PaddedMonitor, nonleaf+5,   true,  Monitor::_safepoint_check_sometimes);
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  def(RedefineClasses_lock         , PaddedMonitor, nonleaf+5,   true,  Monitor::_safepoint_check_always);
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  if (WhiteBoxAPI) {
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    def(Compilation_lock           , PaddedMonitor, leaf,        false, Monitor::_safepoint_check_never);
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  }
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#ifdef INCLUDE_TRACE
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  def(JfrMsg_lock                  , PaddedMonitor, leaf,        true,  Monitor::_safepoint_check_always);
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  def(JfrBuffer_lock               , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_never);
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  def(JfrThreadGroups_lock         , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_always);
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  def(JfrStream_lock               , PaddedMutex  , leaf+1,      true,  Monitor::_safepoint_check_never);      // ensure to rank lower than 'safepoint'
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  def(JfrStacktrace_lock           , PaddedMutex  , special,     true,  Monitor::_safepoint_check_sometimes);
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#endif
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#ifndef SUPPORTS_NATIVE_CX8
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  def(UnsafeJlong_lock             , PaddedMutex  , special,     false, Monitor::_safepoint_check_never);
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#endif
1
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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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}