author | dcubed |
Fri, 27 Jul 2018 16:29:36 -0400 | |
changeset 51258 | 2ce72467c4e8 |
parent 50113 | caf115bb98ad |
child 51702 | ebd5b1ad971a |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 1998, 2018, 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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||
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#include "precompiled.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "logging/log.hpp" |
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#include "jfr/jfrEvents.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "memory/metaspaceShared.hpp" |
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#include "memory/padded.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/markOop.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/atomic.hpp" |
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#include "runtime/biasedLocking.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/interfaceSupport.inline.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/objectMonitor.hpp" |
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#include "runtime/objectMonitor.inline.hpp" |
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#include "runtime/osThread.hpp" |
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#include "runtime/safepointVerifiers.hpp" |
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#include "runtime/sharedRuntime.hpp" |
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#include "runtime/stubRoutines.hpp" |
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#include "runtime/synchronizer.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "runtime/vframe.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "utilities/align.hpp" |
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#include "utilities/dtrace.hpp" |
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#include "utilities/events.hpp" |
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#include "utilities/preserveException.hpp" |
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// The "core" versions of monitor enter and exit reside in this file. |
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// The interpreter and compilers contain specialized transliterated |
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// variants of the enter-exit fast-path operations. See i486.ad fast_lock(), |
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// for instance. If you make changes here, make sure to modify the |
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// interpreter, and both C1 and C2 fast-path inline locking code emission. |
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// |
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// ----------------------------------------------------------------------------- |
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#ifdef DTRACE_ENABLED |
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||
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// Only bother with this argument setup if dtrace is available |
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// TODO-FIXME: probes should not fire when caller is _blocked. assert() accordingly. |
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#define DTRACE_MONITOR_PROBE_COMMON(obj, thread) \ |
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char* bytes = NULL; \ |
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int len = 0; \ |
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jlong jtid = SharedRuntime::get_java_tid(thread); \ |
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Symbol* klassname = ((oop)(obj))->klass()->name(); \ |
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if (klassname != NULL) { \ |
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bytes = (char*)klassname->bytes(); \ |
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len = klassname->utf8_length(); \ |
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} |
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#define DTRACE_MONITOR_WAIT_PROBE(monitor, obj, thread, millis) \ |
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{ \ |
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if (DTraceMonitorProbes) { \ |
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DTRACE_MONITOR_PROBE_COMMON(obj, thread); \ |
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HOTSPOT_MONITOR_WAIT(jtid, \ |
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(uintptr_t)(monitor), bytes, len, (millis)); \ |
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} \ |
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} |
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#define HOTSPOT_MONITOR_PROBE_notify HOTSPOT_MONITOR_NOTIFY |
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#define HOTSPOT_MONITOR_PROBE_notifyAll HOTSPOT_MONITOR_NOTIFYALL |
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#define HOTSPOT_MONITOR_PROBE_waited HOTSPOT_MONITOR_WAITED |
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#define DTRACE_MONITOR_PROBE(probe, monitor, obj, thread) \ |
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{ \ |
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if (DTraceMonitorProbes) { \ |
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DTRACE_MONITOR_PROBE_COMMON(obj, thread); \ |
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HOTSPOT_MONITOR_PROBE_##probe(jtid, /* probe = waited */ \ |
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(uintptr_t)(monitor), bytes, len); \ |
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} \ |
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} |
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#else // ndef DTRACE_ENABLED |
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#define DTRACE_MONITOR_WAIT_PROBE(obj, thread, millis, mon) {;} |
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#define DTRACE_MONITOR_PROBE(probe, obj, thread, mon) {;} |
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#endif // ndef DTRACE_ENABLED |
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// This exists only as a workaround of dtrace bug 6254741 |
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int dtrace_waited_probe(ObjectMonitor* monitor, Handle obj, Thread* thr) { |
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DTRACE_MONITOR_PROBE(waited, monitor, obj(), thr); |
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return 0; |
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} |
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#define NINFLATIONLOCKS 256 |
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static volatile intptr_t gInflationLocks[NINFLATIONLOCKS]; |
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// global list of blocks of monitors |
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PaddedEnd<ObjectMonitor> * volatile ObjectSynchronizer::gBlockList = NULL; |
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// global monitor free list |
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ObjectMonitor * volatile ObjectSynchronizer::gFreeList = NULL; |
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// global monitor in-use list, for moribund threads, |
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// monitors they inflated need to be scanned for deflation |
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ObjectMonitor * volatile ObjectSynchronizer::gOmInUseList = NULL; |
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// count of entries in gOmInUseList |
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int ObjectSynchronizer::gOmInUseCount = 0; |
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static volatile intptr_t gListLock = 0; // protects global monitor lists |
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static volatile int gMonitorFreeCount = 0; // # on gFreeList |
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static volatile int gMonitorPopulation = 0; // # Extant -- in circulation |
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#define CHAINMARKER (cast_to_oop<intptr_t>(-1)) |
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// =====================> Quick functions |
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// The quick_* forms are special fast-path variants used to improve |
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// performance. In the simplest case, a "quick_*" implementation could |
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// simply return false, in which case the caller will perform the necessary |
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// state transitions and call the slow-path form. |
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// The fast-path is designed to handle frequently arising cases in an efficient |
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// manner and is just a degenerate "optimistic" variant of the slow-path. |
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// returns true -- to indicate the call was satisfied. |
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// returns false -- to indicate the call needs the services of the slow-path. |
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// A no-loitering ordinance is in effect for code in the quick_* family |
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// operators: safepoints or indefinite blocking (blocking that might span a |
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// safepoint) are forbidden. Generally the thread_state() is _in_Java upon |
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// entry. |
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// |
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// Consider: An interesting optimization is to have the JIT recognize the |
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// following common idiom: |
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// synchronized (someobj) { .... ; notify(); } |
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// That is, we find a notify() or notifyAll() call that immediately precedes |
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// the monitorexit operation. In that case the JIT could fuse the operations |
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// into a single notifyAndExit() runtime primitive. |
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bool ObjectSynchronizer::quick_notify(oopDesc * obj, Thread * self, bool all) { |
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assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
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assert(self->is_Java_thread(), "invariant"); |
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assert(((JavaThread *) self)->thread_state() == _thread_in_Java, "invariant"); |
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NoSafepointVerifier nsv; |
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if (obj == NULL) return false; // slow-path for invalid obj |
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const markOop mark = obj->mark(); |
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if (mark->has_locker() && self->is_lock_owned((address)mark->locker())) { |
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// Degenerate notify |
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// stack-locked by caller so by definition the implied waitset is empty. |
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return true; |
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} |
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if (mark->has_monitor()) { |
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ObjectMonitor * const mon = mark->monitor(); |
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assert(oopDesc::equals((oop) mon->object(), obj), "invariant"); |
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if (mon->owner() != self) return false; // slow-path for IMS exception |
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if (mon->first_waiter() != NULL) { |
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// We have one or more waiters. Since this is an inflated monitor |
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// that we own, we can transfer one or more threads from the waitset |
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// to the entrylist here and now, avoiding the slow-path. |
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if (all) { |
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DTRACE_MONITOR_PROBE(notifyAll, mon, obj, self); |
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} else { |
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DTRACE_MONITOR_PROBE(notify, mon, obj, self); |
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} |
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int tally = 0; |
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do { |
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mon->INotify(self); |
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++tally; |
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} while (mon->first_waiter() != NULL && all); |
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OM_PERFDATA_OP(Notifications, inc(tally)); |
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} |
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return true; |
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} |
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// biased locking and any other IMS exception states take the slow-path |
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return false; |
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} |
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||
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// The LockNode emitted directly at the synchronization site would have |
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// been too big if it were to have included support for the cases of inflated |
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// recursive enter and exit, so they go here instead. |
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// Note that we can't safely call AsyncPrintJavaStack() from within |
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// quick_enter() as our thread state remains _in_Java. |
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bool ObjectSynchronizer::quick_enter(oop obj, Thread * Self, |
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BasicLock * lock) { |
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assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
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assert(Self->is_Java_thread(), "invariant"); |
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assert(((JavaThread *) Self)->thread_state() == _thread_in_Java, "invariant"); |
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NoSafepointVerifier nsv; |
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if (obj == NULL) return false; // Need to throw NPE |
211 |
const markOop mark = obj->mark(); |
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212 |
||
213 |
if (mark->has_monitor()) { |
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ObjectMonitor * const m = mark->monitor(); |
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assert(oopDesc::equals((oop) m->object(), obj), "invariant"); |
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Thread * const owner = (Thread *) m->_owner; |
217 |
||
218 |
// Lock contention and Transactional Lock Elision (TLE) diagnostics |
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// and observability |
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220 |
// Case: light contention possibly amenable to TLE |
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221 |
// Case: TLE inimical operations such as nested/recursive synchronization |
|
222 |
||
223 |
if (owner == Self) { |
|
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m->_recursions++; |
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225 |
return true; |
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226 |
} |
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// This Java Monitor is inflated so obj's header will never be |
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// displaced to this thread's BasicLock. Make the displaced header |
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// non-NULL so this BasicLock is not seen as recursive nor as |
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// being locked. We do this unconditionally so that this thread's |
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// BasicLock cannot be mis-interpreted by any stack walkers. For |
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// performance reasons, stack walkers generally first check for |
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// Biased Locking in the object's header, the second check is for |
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// stack-locking in the object's header, the third check is for |
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// recursive stack-locking in the displaced header in the BasicLock, |
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// and last are the inflated Java Monitor (ObjectMonitor) checks. |
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lock->set_displaced_header(markOopDesc::unused_mark()); |
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239 |
|
48488 | 240 |
if (owner == NULL && Atomic::replace_if_null(Self, &(m->_owner))) { |
29070 | 241 |
assert(m->_recursions == 0, "invariant"); |
242 |
assert(m->_owner == Self, "invariant"); |
|
243 |
return true; |
|
244 |
} |
|
245 |
} |
|
246 |
||
247 |
// Note that we could inflate in quick_enter. |
|
248 |
// This is likely a useful optimization |
|
249 |
// Critically, in quick_enter() we must not: |
|
250 |
// -- perform bias revocation, or |
|
251 |
// -- block indefinitely, or |
|
252 |
// -- reach a safepoint |
|
253 |
||
254 |
return false; // revert to slow-path |
|
255 |
} |
|
256 |
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6975 | 257 |
// ----------------------------------------------------------------------------- |
258 |
// Fast Monitor Enter/Exit |
|
259 |
// This the fast monitor enter. The interpreter and compiler use |
|
260 |
// some assembly copies of this code. Make sure update those code |
|
261 |
// if the following function is changed. The implementation is |
|
262 |
// extremely sensitive to race condition. Be careful. |
|
263 |
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264 |
void ObjectSynchronizer::fast_enter(Handle obj, BasicLock* lock, |
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bool attempt_rebias, TRAPS) { |
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266 |
if (UseBiasedLocking) { |
6975 | 267 |
if (!SafepointSynchronize::is_at_safepoint()) { |
268 |
BiasedLocking::Condition cond = BiasedLocking::revoke_and_rebias(obj, attempt_rebias, THREAD); |
|
269 |
if (cond == BiasedLocking::BIAS_REVOKED_AND_REBIASED) { |
|
270 |
return; |
|
271 |
} |
|
272 |
} else { |
|
273 |
assert(!attempt_rebias, "can not rebias toward VM thread"); |
|
274 |
BiasedLocking::revoke_at_safepoint(obj); |
|
275 |
} |
|
276 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
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} |
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279 |
slow_enter(obj, lock, THREAD); |
6975 | 280 |
} |
281 |
||
282 |
void ObjectSynchronizer::fast_exit(oop object, BasicLock* lock, TRAPS) { |
|
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283 |
markOop mark = object->mark(); |
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284 |
// We cannot check for Biased Locking if we are racing an inflation. |
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285 |
assert(mark == markOopDesc::INFLATING() || |
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|
286 |
!mark->has_bias_pattern(), "should not see bias pattern here"); |
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287 |
|
6975 | 288 |
markOop dhw = lock->displaced_header(); |
289 |
if (dhw == NULL) { |
|
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290 |
// If the displaced header is NULL, then this exit matches up with |
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|
291 |
// a recursive enter. No real work to do here except for diagnostics. |
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|
292 |
#ifndef PRODUCT |
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|
293 |
if (mark != markOopDesc::INFLATING()) { |
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|
294 |
// Only do diagnostics if we are not racing an inflation. Simply |
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295 |
// exiting a recursive enter of a Java Monitor that is being |
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296 |
// inflated is safe; see the has_monitor() comment below. |
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|
297 |
assert(!mark->is_neutral(), "invariant"); |
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|
298 |
assert(!mark->has_locker() || |
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|
299 |
THREAD->is_lock_owned((address)mark->locker()), "invariant"); |
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|
300 |
if (mark->has_monitor()) { |
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|
301 |
// The BasicLock's displaced_header is marked as a recursive |
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|
302 |
// enter and we have an inflated Java Monitor (ObjectMonitor). |
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|
303 |
// This is a special case where the Java Monitor was inflated |
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|
304 |
// after this thread entered the stack-lock recursively. When a |
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|
305 |
// Java Monitor is inflated, we cannot safely walk the Java |
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|
306 |
// Monitor owner's stack and update the BasicLocks because a |
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|
307 |
// Java Monitor can be asynchronously inflated by a thread that |
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|
308 |
// does not own the Java Monitor. |
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|
309 |
ObjectMonitor * m = mark->monitor(); |
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|
310 |
assert(((oop)(m->object()))->mark() == mark, "invariant"); |
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311 |
assert(m->is_entered(THREAD), "invariant"); |
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312 |
} |
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313 |
} |
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|
314 |
#endif |
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|
315 |
return; |
6975 | 316 |
} |
317 |
||
318 |
if (mark == (markOop) lock) { |
|
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|
319 |
// If the object is stack-locked by the current thread, try to |
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|
320 |
// swing the displaced header from the BasicLock back to the mark. |
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|
321 |
assert(dhw->is_neutral(), "invariant"); |
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|
322 |
if (object->cas_set_mark(dhw, mark) == mark) { |
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|
323 |
TEVENT(fast_exit: release stack-lock); |
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|
324 |
return; |
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|
325 |
} |
6975 | 326 |
} |
327 |
||
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|
328 |
// We have to take the slow-path of possible inflation and then exit. |
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|
329 |
ObjectSynchronizer::inflate(THREAD, |
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|
330 |
object, |
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|
331 |
inflate_cause_vm_internal)->exit(true, THREAD); |
6975 | 332 |
} |
333 |
||
334 |
// ----------------------------------------------------------------------------- |
|
335 |
// Interpreter/Compiler Slow Case |
|
336 |
// This routine is used to handle interpreter/compiler slow case |
|
337 |
// We don't need to use fast path here, because it must have been |
|
338 |
// failed in the interpreter/compiler code. |
|
339 |
void ObjectSynchronizer::slow_enter(Handle obj, BasicLock* lock, TRAPS) { |
|
340 |
markOop mark = obj->mark(); |
|
341 |
assert(!mark->has_bias_pattern(), "should not see bias pattern here"); |
|
342 |
||
343 |
if (mark->is_neutral()) { |
|
344 |
// Anticipate successful CAS -- the ST of the displaced mark must |
|
345 |
// be visible <= the ST performed by the CAS. |
|
346 |
lock->set_displaced_header(mark); |
|
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|
347 |
if (mark == obj()->cas_set_mark((markOop) lock, mark)) { |
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|
348 |
TEVENT(slow_enter: release stacklock); |
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|
349 |
return; |
6975 | 350 |
} |
351 |
// Fall through to inflate() ... |
|
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352 |
} else if (mark->has_locker() && |
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|
353 |
THREAD->is_lock_owned((address)mark->locker())) { |
6975 | 354 |
assert(lock != mark->locker(), "must not re-lock the same lock"); |
355 |
assert(lock != (BasicLock*)obj->mark(), "don't relock with same BasicLock"); |
|
356 |
lock->set_displaced_header(NULL); |
|
357 |
return; |
|
358 |
} |
|
359 |
||
360 |
// The object header will never be displaced to this lock, |
|
361 |
// so it does not matter what the value is, except that it |
|
362 |
// must be non-zero to avoid looking like a re-entrant lock, |
|
363 |
// and must not look locked either. |
|
364 |
lock->set_displaced_header(markOopDesc::unused_mark()); |
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|
365 |
ObjectSynchronizer::inflate(THREAD, |
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|
366 |
obj(), |
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|
367 |
inflate_cause_monitor_enter)->enter(THREAD); |
6975 | 368 |
} |
369 |
||
370 |
// This routine is used to handle interpreter/compiler slow case |
|
371 |
// We don't need to use fast path here, because it must have |
|
372 |
// failed in the interpreter/compiler code. Simply use the heavy |
|
373 |
// weight monitor should be ok, unless someone find otherwise. |
|
374 |
void ObjectSynchronizer::slow_exit(oop object, BasicLock* lock, TRAPS) { |
|
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|
375 |
fast_exit(object, lock, THREAD); |
6975 | 376 |
} |
377 |
||
378 |
// ----------------------------------------------------------------------------- |
|
379 |
// Class Loader support to workaround deadlocks on the class loader lock objects |
|
380 |
// Also used by GC |
|
381 |
// complete_exit()/reenter() are used to wait on a nested lock |
|
382 |
// i.e. to give up an outer lock completely and then re-enter |
|
383 |
// Used when holding nested locks - lock acquisition order: lock1 then lock2 |
|
384 |
// 1) complete_exit lock1 - saving recursion count |
|
385 |
// 2) wait on lock2 |
|
386 |
// 3) when notified on lock2, unlock lock2 |
|
387 |
// 4) reenter lock1 with original recursion count |
|
388 |
// 5) lock lock2 |
|
389 |
// NOTE: must use heavy weight monitor to handle complete_exit/reenter() |
|
390 |
intptr_t ObjectSynchronizer::complete_exit(Handle obj, TRAPS) { |
|
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|
391 |
TEVENT(complete_exit); |
6975 | 392 |
if (UseBiasedLocking) { |
393 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
394 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
1 | 395 |
} |
396 |
||
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|
397 |
ObjectMonitor* monitor = ObjectSynchronizer::inflate(THREAD, |
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|
398 |
obj(), |
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|
399 |
inflate_cause_vm_internal); |
6975 | 400 |
|
401 |
return monitor->complete_exit(THREAD); |
|
402 |
} |
|
403 |
||
404 |
// NOTE: must use heavy weight monitor to handle complete_exit/reenter() |
|
405 |
void ObjectSynchronizer::reenter(Handle obj, intptr_t recursion, TRAPS) { |
|
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|
406 |
TEVENT(reenter); |
6975 | 407 |
if (UseBiasedLocking) { |
408 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
409 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
410 |
} |
|
411 |
||
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|
412 |
ObjectMonitor* monitor = ObjectSynchronizer::inflate(THREAD, |
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|
413 |
obj(), |
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|
414 |
inflate_cause_vm_internal); |
6975 | 415 |
|
416 |
monitor->reenter(recursion, THREAD); |
|
417 |
} |
|
418 |
// ----------------------------------------------------------------------------- |
|
419 |
// JNI locks on java objects |
|
420 |
// NOTE: must use heavy weight monitor to handle jni monitor enter |
|
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|
421 |
void ObjectSynchronizer::jni_enter(Handle obj, TRAPS) { |
6975 | 422 |
// the current locking is from JNI instead of Java code |
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|
423 |
TEVENT(jni_enter); |
6975 | 424 |
if (UseBiasedLocking) { |
425 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
426 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
427 |
} |
|
428 |
THREAD->set_current_pending_monitor_is_from_java(false); |
|
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|
429 |
ObjectSynchronizer::inflate(THREAD, obj(), inflate_cause_jni_enter)->enter(THREAD); |
6975 | 430 |
THREAD->set_current_pending_monitor_is_from_java(true); |
431 |
} |
|
432 |
||
433 |
// NOTE: must use heavy weight monitor to handle jni monitor exit |
|
434 |
void ObjectSynchronizer::jni_exit(oop obj, Thread* THREAD) { |
|
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|
435 |
TEVENT(jni_exit); |
6975 | 436 |
if (UseBiasedLocking) { |
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|
437 |
Handle h_obj(THREAD, obj); |
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|
438 |
BiasedLocking::revoke_and_rebias(h_obj, false, THREAD); |
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|
439 |
obj = h_obj(); |
6975 | 440 |
} |
441 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
442 |
||
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|
443 |
ObjectMonitor* monitor = ObjectSynchronizer::inflate(THREAD, |
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|
444 |
obj, |
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|
445 |
inflate_cause_jni_exit); |
6975 | 446 |
// If this thread has locked the object, exit the monitor. Note: can't use |
447 |
// monitor->check(CHECK); must exit even if an exception is pending. |
|
448 |
if (monitor->check(THREAD)) { |
|
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|
449 |
monitor->exit(true, THREAD); |
1 | 450 |
} |
6975 | 451 |
} |
452 |
||
453 |
// ----------------------------------------------------------------------------- |
|
454 |
// Internal VM locks on java objects |
|
455 |
// standard constructor, allows locking failures |
|
456 |
ObjectLocker::ObjectLocker(Handle obj, Thread* thread, bool doLock) { |
|
457 |
_dolock = doLock; |
|
458 |
_thread = thread; |
|
459 |
debug_only(if (StrictSafepointChecks) _thread->check_for_valid_safepoint_state(false);) |
|
460 |
_obj = obj; |
|
1 | 461 |
|
6975 | 462 |
if (_dolock) { |
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|
463 |
TEVENT(ObjectLocker); |
6975 | 464 |
|
465 |
ObjectSynchronizer::fast_enter(_obj, &_lock, false, _thread); |
|
466 |
} |
|
467 |
} |
|
468 |
||
469 |
ObjectLocker::~ObjectLocker() { |
|
470 |
if (_dolock) { |
|
471 |
ObjectSynchronizer::fast_exit(_obj(), &_lock, _thread); |
|
472 |
} |
|
473 |
} |
|
1 | 474 |
|
475 |
||
6975 | 476 |
// ----------------------------------------------------------------------------- |
477 |
// Wait/Notify/NotifyAll |
|
478 |
// NOTE: must use heavy weight monitor to handle wait() |
|
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|
479 |
int ObjectSynchronizer::wait(Handle obj, jlong millis, TRAPS) { |
6975 | 480 |
if (UseBiasedLocking) { |
481 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
482 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
483 |
} |
|
484 |
if (millis < 0) { |
|
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|
485 |
TEVENT(wait - throw IAX); |
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|
486 |
THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); |
6975 | 487 |
} |
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|
488 |
ObjectMonitor* monitor = ObjectSynchronizer::inflate(THREAD, |
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|
489 |
obj(), |
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changeset
|
490 |
inflate_cause_wait); |
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|
491 |
|
6975 | 492 |
DTRACE_MONITOR_WAIT_PROBE(monitor, obj(), THREAD, millis); |
493 |
monitor->wait(millis, true, THREAD); |
|
494 |
||
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8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
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changeset
|
495 |
// This dummy call is in place to get around dtrace bug 6254741. Once |
e043208c9d93
8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
parents:
22551
diff
changeset
|
496 |
// that's fixed we can uncomment the following line, remove the call |
e043208c9d93
8030808: dtrace/hotspot/Monitors/Monitors001 fails in product builds on solaris-sparc
fparain
parents:
22551
diff
changeset
|
497 |
// and change this function back into a "void" func. |
6975 | 498 |
// DTRACE_MONITOR_PROBE(waited, monitor, obj(), THREAD); |
22743
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diff
changeset
|
499 |
return dtrace_waited_probe(monitor, obj, THREAD); |
6975 | 500 |
} |
1 | 501 |
|
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changeset
|
502 |
void ObjectSynchronizer::waitUninterruptibly(Handle obj, jlong millis, TRAPS) { |
6975 | 503 |
if (UseBiasedLocking) { |
504 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
505 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
506 |
} |
|
507 |
if (millis < 0) { |
|
25064
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changeset
|
508 |
TEVENT(wait - throw IAX); |
6975 | 509 |
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative"); |
510 |
} |
|
35934
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8138562: Event based tracing should cover monitor inflation
dsimms
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35492
diff
changeset
|
511 |
ObjectSynchronizer::inflate(THREAD, |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
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35492
diff
changeset
|
512 |
obj(), |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
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diff
changeset
|
513 |
inflate_cause_wait)->wait(millis, false, THREAD); |
6975 | 514 |
} |
515 |
||
516 |
void ObjectSynchronizer::notify(Handle obj, TRAPS) { |
|
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diff
changeset
|
517 |
if (UseBiasedLocking) { |
6975 | 518 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
519 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
520 |
} |
|
1 | 521 |
|
6975 | 522 |
markOop mark = obj->mark(); |
523 |
if (mark->has_locker() && THREAD->is_lock_owned((address)mark->locker())) { |
|
524 |
return; |
|
525 |
} |
|
35934
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diff
changeset
|
526 |
ObjectSynchronizer::inflate(THREAD, |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
527 |
obj(), |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
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35492
diff
changeset
|
528 |
inflate_cause_notify)->notify(THREAD); |
6975 | 529 |
} |
1 | 530 |
|
6975 | 531 |
// NOTE: see comment of notify() |
532 |
void ObjectSynchronizer::notifyall(Handle obj, TRAPS) { |
|
533 |
if (UseBiasedLocking) { |
|
534 |
BiasedLocking::revoke_and_rebias(obj, false, THREAD); |
|
535 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
536 |
} |
|
537 |
||
538 |
markOop mark = obj->mark(); |
|
539 |
if (mark->has_locker() && THREAD->is_lock_owned((address)mark->locker())) { |
|
540 |
return; |
|
541 |
} |
|
35934
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8138562: Event based tracing should cover monitor inflation
dsimms
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35492
diff
changeset
|
542 |
ObjectSynchronizer::inflate(THREAD, |
76dbe86f3d82
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dsimms
parents:
35492
diff
changeset
|
543 |
obj(), |
76dbe86f3d82
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diff
changeset
|
544 |
inflate_cause_notify)->notifyAll(THREAD); |
6975 | 545 |
} |
546 |
||
547 |
// ----------------------------------------------------------------------------- |
|
548 |
// Hash Code handling |
|
549 |
// |
|
1 | 550 |
// Performance concern: |
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8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
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changeset
|
551 |
// OrderAccess::storestore() calls release() which at one time stored 0 |
4cd9c4622c8c
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changeset
|
552 |
// into the global volatile OrderAccess::dummy variable. This store was |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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diff
changeset
|
553 |
// unnecessary for correctness. Many threads storing into a common location |
4cd9c4622c8c
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changeset
|
554 |
// causes considerable cache migration or "sloshing" on large SMP systems. |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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diff
changeset
|
555 |
// As such, I avoided using OrderAccess::storestore(). In some cases |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
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changeset
|
556 |
// OrderAccess::fence() -- which incurs local latency on the executing |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
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25477
diff
changeset
|
557 |
// processor -- is a better choice as it scales on SMP systems. |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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changeset
|
558 |
// |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
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changeset
|
559 |
// See http://blogs.oracle.com/dave/entry/biased_locking_in_hotspot for |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
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diff
changeset
|
560 |
// a discussion of coherency costs. Note that all our current reference |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
561 |
// platforms provide strong ST-ST order, so the issue is moot on IA32, |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
562 |
// x64, and SPARC. |
1 | 563 |
// |
564 |
// As a general policy we use "volatile" to control compiler-based reordering |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
565 |
// and explicit fences (barriers) to control for architectural reordering |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
566 |
// performed by the CPU(s) or platform. |
1 | 567 |
|
568 |
struct SharedGlobals { |
|
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
569 |
char _pad_prefix[DEFAULT_CACHE_LINE_SIZE]; |
26683
a02753d5a0b2
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diff
changeset
|
570 |
// These are highly shared mostly-read variables. |
27165
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dcubed
parents:
26684
diff
changeset
|
571 |
// To avoid false-sharing they need to be the sole occupants of a cache line. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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25633
diff
changeset
|
572 |
volatile int stwRandom; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
573 |
volatile int stwCycle; |
27165
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8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
574 |
DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int) * 2); |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
575 |
// Hot RW variable -- Sequester to avoid false-sharing |
26683
a02753d5a0b2
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parents:
25633
diff
changeset
|
576 |
volatile int hcSequence; |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
577 |
DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile int)); |
25064
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8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
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parents:
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diff
changeset
|
578 |
}; |
1 | 579 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
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parents:
24424
diff
changeset
|
580 |
static SharedGlobals GVars; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
581 |
static int MonitorScavengeThreshold = 1000000; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
582 |
static volatile int ForceMonitorScavenge = 0; // Scavenge required and pending |
1 | 583 |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
584 |
static markOop ReadStableMark(oop obj) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
585 |
markOop mark = obj->mark(); |
6975 | 586 |
if (!mark->is_being_inflated()) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
587 |
return mark; // normal fast-path return |
6975 | 588 |
} |
1 | 589 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
590 |
int its = 0; |
6975 | 591 |
for (;;) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
592 |
markOop mark = obj->mark(); |
6975 | 593 |
if (!mark->is_being_inflated()) { |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
594 |
return mark; // normal fast-path return |
6975 | 595 |
} |
596 |
||
597 |
// The object is being inflated by some other thread. |
|
598 |
// The caller of ReadStableMark() must wait for inflation to complete. |
|
599 |
// Avoid live-lock |
|
600 |
// TODO: consider calling SafepointSynchronize::do_call_back() while |
|
601 |
// spinning to see if there's a safepoint pending. If so, immediately |
|
602 |
// yielding or blocking would be appropriate. Avoid spinning while |
|
603 |
// there is a safepoint pending. |
|
604 |
// TODO: add inflation contention performance counters. |
|
605 |
// TODO: restrict the aggregate number of spinners. |
|
1 | 606 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
607 |
++its; |
6975 | 608 |
if (its > 10000 || !os::is_MP()) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
609 |
if (its & 1) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
610 |
os::naked_yield(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
611 |
TEVENT(Inflate: INFLATING - yield); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
612 |
} else { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
613 |
// Note that the following code attenuates the livelock problem but is not |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
614 |
// a complete remedy. A more complete solution would require that the inflating |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
615 |
// thread hold the associated inflation lock. The following code simply restricts |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
616 |
// the number of spinners to at most one. We'll have N-2 threads blocked |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
617 |
// on the inflationlock, 1 thread holding the inflation lock and using |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
618 |
// a yield/park strategy, and 1 thread in the midst of inflation. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
619 |
// A more refined approach would be to change the encoding of INFLATING |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
620 |
// to allow encapsulation of a native thread pointer. Threads waiting for |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
621 |
// inflation to complete would use CAS to push themselves onto a singly linked |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
622 |
// list rooted at the markword. Once enqueued, they'd loop, checking a per-thread flag |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
623 |
// and calling park(). When inflation was complete the thread that accomplished inflation |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
624 |
// would detach the list and set the markword to inflated with a single CAS and |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
625 |
// then for each thread on the list, set the flag and unpark() the thread. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
626 |
// This is conceptually similar to muxAcquire-muxRelease, except that muxRelease |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
627 |
// wakes at most one thread whereas we need to wake the entire list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
628 |
int ix = (cast_from_oop<intptr_t>(obj) >> 5) & (NINFLATIONLOCKS-1); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
629 |
int YieldThenBlock = 0; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
630 |
assert(ix >= 0 && ix < NINFLATIONLOCKS, "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
631 |
assert((NINFLATIONLOCKS & (NINFLATIONLOCKS-1)) == 0, "invariant"); |
30244 | 632 |
Thread::muxAcquire(gInflationLocks + ix, "gInflationLock"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
633 |
while (obj->mark() == markOopDesc::INFLATING()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
634 |
// Beware: NakedYield() is advisory and has almost no effect on some platforms |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
635 |
// so we periodically call Self->_ParkEvent->park(1). |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
636 |
// We use a mixed spin/yield/block mechanism. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
637 |
if ((YieldThenBlock++) >= 16) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
638 |
Thread::current()->_ParkEvent->park(1); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
639 |
} else { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
640 |
os::naked_yield(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
641 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
642 |
} |
30244 | 643 |
Thread::muxRelease(gInflationLocks + ix); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
644 |
TEVENT(Inflate: INFLATING - yield/park); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
645 |
} |
6975 | 646 |
} else { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
647 |
SpinPause(); // SMP-polite spinning |
6975 | 648 |
} |
649 |
} |
|
650 |
} |
|
1 | 651 |
|
652 |
// hashCode() generation : |
|
653 |
// |
|
654 |
// Possibilities: |
|
655 |
// * MD5Digest of {obj,stwRandom} |
|
656 |
// * CRC32 of {obj,stwRandom} or any linear-feedback shift register function. |
|
657 |
// * A DES- or AES-style SBox[] mechanism |
|
658 |
// * One of the Phi-based schemes, such as: |
|
659 |
// 2654435761 = 2^32 * Phi (golden ratio) |
|
660 |
// HashCodeValue = ((uintptr_t(obj) >> 3) * 2654435761) ^ GVars.stwRandom ; |
|
661 |
// * A variation of Marsaglia's shift-xor RNG scheme. |
|
662 |
// * (obj ^ stwRandom) is appealing, but can result |
|
663 |
// in undesirable regularity in the hashCode values of adjacent objects |
|
664 |
// (objects allocated back-to-back, in particular). This could potentially |
|
665 |
// result in hashtable collisions and reduced hashtable efficiency. |
|
666 |
// There are simple ways to "diffuse" the middle address bits over the |
|
667 |
// generated hashCode values: |
|
668 |
||
669 |
static inline intptr_t get_next_hash(Thread * Self, oop obj) { |
|
25064
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diff
changeset
|
670 |
intptr_t value = 0; |
1 | 671 |
if (hashCode == 0) { |
46587
6c97f34cb194
8182554: Code for os::random() assumes long is 32 bits
coleenp
parents:
46541
diff
changeset
|
672 |
// This form uses global Park-Miller RNG. |
26683
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25633
diff
changeset
|
673 |
// On MP system we'll have lots of RW access to a global, so the |
a02753d5a0b2
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diff
changeset
|
674 |
// mechanism induces lots of coherency traffic. |
a02753d5a0b2
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diff
changeset
|
675 |
value = os::random(); |
26684
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26683
diff
changeset
|
676 |
} else if (hashCode == 1) { |
26683
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25633
diff
changeset
|
677 |
// This variation has the property of being stable (idempotent) |
a02753d5a0b2
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diff
changeset
|
678 |
// between STW operations. This can be useful in some of the 1-0 |
a02753d5a0b2
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diff
changeset
|
679 |
// synchronization schemes. |
a02753d5a0b2
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diff
changeset
|
680 |
intptr_t addrBits = cast_from_oop<intptr_t>(obj) >> 3; |
a02753d5a0b2
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changeset
|
681 |
value = addrBits ^ (addrBits >> 5) ^ GVars.stwRandom; |
26684
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diff
changeset
|
682 |
} else if (hashCode == 2) { |
26683
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changeset
|
683 |
value = 1; // for sensitivity testing |
26684
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diff
changeset
|
684 |
} else if (hashCode == 3) { |
26683
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changeset
|
685 |
value = ++GVars.hcSequence; |
26684
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diff
changeset
|
686 |
} else if (hashCode == 4) { |
26683
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diff
changeset
|
687 |
value = cast_from_oop<intptr_t>(obj); |
1 | 688 |
} else { |
26683
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changeset
|
689 |
// Marsaglia's xor-shift scheme with thread-specific state |
a02753d5a0b2
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changeset
|
690 |
// This is probably the best overall implementation -- we'll |
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changeset
|
691 |
// likely make this the default in future releases. |
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changeset
|
692 |
unsigned t = Self->_hashStateX; |
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changeset
|
693 |
t ^= (t << 11); |
a02753d5a0b2
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changeset
|
694 |
Self->_hashStateX = Self->_hashStateY; |
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changeset
|
695 |
Self->_hashStateY = Self->_hashStateZ; |
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changeset
|
696 |
Self->_hashStateZ = Self->_hashStateW; |
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diff
changeset
|
697 |
unsigned v = Self->_hashStateW; |
a02753d5a0b2
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changeset
|
698 |
v = (v ^ (v >> 19)) ^ (t ^ (t >> 8)); |
a02753d5a0b2
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changeset
|
699 |
Self->_hashStateW = v; |
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changeset
|
700 |
value = v; |
1 | 701 |
} |
702 |
||
703 |
value &= markOopDesc::hash_mask; |
|
25064
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changeset
|
704 |
if (value == 0) value = 0xBAD; |
244218e6ec0a
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changeset
|
705 |
assert(value != markOopDesc::no_hash, "invariant"); |
244218e6ec0a
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changeset
|
706 |
TEVENT(hashCode: GENERATE); |
1 | 707 |
return value; |
708 |
} |
|
26684
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changeset
|
709 |
|
d1221849ea3d
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changeset
|
710 |
intptr_t ObjectSynchronizer::FastHashCode(Thread * Self, oop obj) { |
6975 | 711 |
if (UseBiasedLocking) { |
712 |
// NOTE: many places throughout the JVM do not expect a safepoint |
|
713 |
// to be taken here, in particular most operations on perm gen |
|
714 |
// objects. However, we only ever bias Java instances and all of |
|
715 |
// the call sites of identity_hash that might revoke biases have |
|
716 |
// been checked to make sure they can handle a safepoint. The |
|
717 |
// added check of the bias pattern is to avoid useless calls to |
|
718 |
// thread-local storage. |
|
719 |
if (obj->mark()->has_bias_pattern()) { |
|
25472
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diff
changeset
|
720 |
// Handle for oop obj in case of STW safepoint |
25064
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changeset
|
721 |
Handle hobj(Self, obj); |
6975 | 722 |
// Relaxing assertion for bug 6320749. |
25064
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changeset
|
723 |
assert(Universe::verify_in_progress() || |
26683
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changeset
|
724 |
!SafepointSynchronize::is_at_safepoint(), |
6975 | 725 |
"biases should not be seen by VM thread here"); |
726 |
BiasedLocking::revoke_and_rebias(hobj, false, JavaThread::current()); |
|
25064
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changeset
|
727 |
obj = hobj(); |
6975 | 728 |
assert(!obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
729 |
} |
|
730 |
} |
|
1 | 731 |
|
6975 | 732 |
// hashCode() is a heap mutator ... |
733 |
// Relaxing assertion for bug 6320749. |
|
31345
1bba15125d8d
8015086: add interned strings to the shared archive.
jiangli
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diff
changeset
|
734 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
26683
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changeset
|
735 |
!SafepointSynchronize::is_at_safepoint(), "invariant"); |
31345
1bba15125d8d
8015086: add interned strings to the shared archive.
jiangli
parents:
30244
diff
changeset
|
736 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
26683
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changeset
|
737 |
Self->is_Java_thread() , "invariant"); |
31345
1bba15125d8d
8015086: add interned strings to the shared archive.
jiangli
parents:
30244
diff
changeset
|
738 |
assert(Universe::verify_in_progress() || DumpSharedSpaces || |
25064
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changeset
|
739 |
((JavaThread *)Self)->thread_state() != _thread_blocked, "invariant"); |
6975 | 740 |
|
741 |
ObjectMonitor* monitor = NULL; |
|
742 |
markOop temp, test; |
|
743 |
intptr_t hash; |
|
26684
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diff
changeset
|
744 |
markOop mark = ReadStableMark(obj); |
6975 | 745 |
|
746 |
// object should remain ineligible for biased locking |
|
25064
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diff
changeset
|
747 |
assert(!mark->has_bias_pattern(), "invariant"); |
6975 | 748 |
|
749 |
if (mark->is_neutral()) { |
|
750 |
hash = mark->hash(); // this is a normal header |
|
751 |
if (hash) { // if it has hash, just return it |
|
752 |
return hash; |
|
753 |
} |
|
754 |
hash = get_next_hash(Self, obj); // allocate a new hash code |
|
755 |
temp = mark->copy_set_hash(hash); // merge the hash code into header |
|
756 |
// use (machine word version) atomic operation to install the hash |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
757 |
test = obj->cas_set_mark(temp, mark); |
6975 | 758 |
if (test == mark) { |
759 |
return hash; |
|
760 |
} |
|
761 |
// If atomic operation failed, we must inflate the header |
|
762 |
// into heavy weight monitor. We could add more code here |
|
763 |
// for fast path, but it does not worth the complexity. |
|
764 |
} else if (mark->has_monitor()) { |
|
765 |
monitor = mark->monitor(); |
|
766 |
temp = monitor->header(); |
|
25064
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diff
changeset
|
767 |
assert(temp->is_neutral(), "invariant"); |
6975 | 768 |
hash = temp->hash(); |
769 |
if (hash) { |
|
770 |
return hash; |
|
771 |
} |
|
772 |
// Skip to the following code to reduce code size |
|
773 |
} else if (Self->is_lock_owned((address)mark->locker())) { |
|
774 |
temp = mark->displaced_mark_helper(); // this is a lightweight monitor owned |
|
25064
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diff
changeset
|
775 |
assert(temp->is_neutral(), "invariant"); |
6975 | 776 |
hash = temp->hash(); // by current thread, check if the displaced |
777 |
if (hash) { // header contains hash code |
|
778 |
return hash; |
|
779 |
} |
|
780 |
// WARNING: |
|
781 |
// The displaced header is strictly immutable. |
|
782 |
// It can NOT be changed in ANY cases. So we have |
|
783 |
// to inflate the header into heavyweight monitor |
|
784 |
// even the current thread owns the lock. The reason |
|
785 |
// is the BasicLock (stack slot) will be asynchronously |
|
786 |
// read by other threads during the inflate() function. |
|
787 |
// Any change to stack may not propagate to other threads |
|
788 |
// correctly. |
|
789 |
} |
|
790 |
||
791 |
// Inflate the monitor to set hash code |
|
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
792 |
monitor = ObjectSynchronizer::inflate(Self, obj, inflate_cause_hash_code); |
6975 | 793 |
// Load displaced header and check it has hash code |
794 |
mark = monitor->header(); |
|
25064
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diff
changeset
|
795 |
assert(mark->is_neutral(), "invariant"); |
6975 | 796 |
hash = mark->hash(); |
797 |
if (hash == 0) { |
|
798 |
hash = get_next_hash(Self, obj); |
|
799 |
temp = mark->copy_set_hash(hash); // merge hash code into header |
|
25064
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8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
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diff
changeset
|
800 |
assert(temp->is_neutral(), "invariant"); |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
801 |
test = Atomic::cmpxchg(temp, monitor->header_addr(), mark); |
6975 | 802 |
if (test != mark) { |
803 |
// The only update to the header in the monitor (outside GC) |
|
804 |
// is install the hash code. If someone add new usage of |
|
805 |
// displaced header, please update this code |
|
806 |
hash = test->hash(); |
|
25064
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diff
changeset
|
807 |
assert(test->is_neutral(), "invariant"); |
244218e6ec0a
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parents:
24424
diff
changeset
|
808 |
assert(hash != 0, "Trivial unexpected object/monitor header usage."); |
6975 | 809 |
} |
810 |
} |
|
811 |
// We finally get the hash |
|
812 |
return hash; |
|
1 | 813 |
} |
814 |
||
6975 | 815 |
// Deprecated -- use FastHashCode() instead. |
1 | 816 |
|
6975 | 817 |
intptr_t ObjectSynchronizer::identity_hash_value_for(Handle obj) { |
25064
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diff
changeset
|
818 |
return FastHashCode(Thread::current(), obj()); |
1 | 819 |
} |
820 |
||
821 |
||
6975 | 822 |
bool ObjectSynchronizer::current_thread_holds_lock(JavaThread* thread, |
823 |
Handle h_obj) { |
|
824 |
if (UseBiasedLocking) { |
|
825 |
BiasedLocking::revoke_and_rebias(h_obj, false, thread); |
|
826 |
assert(!h_obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
827 |
} |
|
828 |
||
829 |
assert(thread == JavaThread::current(), "Can only be called on current thread"); |
|
830 |
oop obj = h_obj(); |
|
831 |
||
25064
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parents:
24424
diff
changeset
|
832 |
markOop mark = ReadStableMark(obj); |
1 | 833 |
|
6975 | 834 |
// Uncontended case, header points to stack |
835 |
if (mark->has_locker()) { |
|
836 |
return thread->is_lock_owned((address)mark->locker()); |
|
1 | 837 |
} |
6975 | 838 |
// Contended case, header points to ObjectMonitor (tagged pointer) |
839 |
if (mark->has_monitor()) { |
|
840 |
ObjectMonitor* monitor = mark->monitor(); |
|
25064
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diff
changeset
|
841 |
return monitor->is_entered(thread) != 0; |
1 | 842 |
} |
6975 | 843 |
// Unlocked case, header in place |
844 |
assert(mark->is_neutral(), "sanity check"); |
|
845 |
return false; |
|
1 | 846 |
} |
847 |
||
6975 | 848 |
// Be aware of this method could revoke bias of the lock object. |
22551 | 849 |
// This method queries the ownership of the lock handle specified by 'h_obj'. |
6975 | 850 |
// If the current thread owns the lock, it returns owner_self. If no |
851 |
// thread owns the lock, it returns owner_none. Otherwise, it will return |
|
22551 | 852 |
// owner_other. |
6975 | 853 |
ObjectSynchronizer::LockOwnership ObjectSynchronizer::query_lock_ownership |
854 |
(JavaThread *self, Handle h_obj) { |
|
855 |
// The caller must beware this method can revoke bias, and |
|
856 |
// revocation can result in a safepoint. |
|
25064
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parents:
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diff
changeset
|
857 |
assert(!SafepointSynchronize::is_at_safepoint(), "invariant"); |
26684
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parents:
26683
diff
changeset
|
858 |
assert(self->thread_state() != _thread_blocked, "invariant"); |
1 | 859 |
|
6975 | 860 |
// Possible mark states: neutral, biased, stack-locked, inflated |
861 |
||
862 |
if (UseBiasedLocking && h_obj()->mark()->has_bias_pattern()) { |
|
863 |
// CASE: biased |
|
864 |
BiasedLocking::revoke_and_rebias(h_obj, false, self); |
|
865 |
assert(!h_obj->mark()->has_bias_pattern(), |
|
866 |
"biases should be revoked by now"); |
|
867 |
} |
|
1 | 868 |
|
6975 | 869 |
assert(self == JavaThread::current(), "Can only be called on current thread"); |
870 |
oop obj = h_obj(); |
|
25064
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dcubed
parents:
24424
diff
changeset
|
871 |
markOop mark = ReadStableMark(obj); |
6975 | 872 |
|
873 |
// CASE: stack-locked. Mark points to a BasicLock on the owner's stack. |
|
874 |
if (mark->has_locker()) { |
|
875 |
return self->is_lock_owned((address)mark->locker()) ? |
|
876 |
owner_self : owner_other; |
|
877 |
} |
|
1 | 878 |
|
6975 | 879 |
// CASE: inflated. Mark (tagged pointer) points to an objectMonitor. |
880 |
// The Object:ObjectMonitor relationship is stable as long as we're |
|
881 |
// not at a safepoint. |
|
882 |
if (mark->has_monitor()) { |
|
25064
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parents:
24424
diff
changeset
|
883 |
void * owner = mark->monitor()->_owner; |
244218e6ec0a
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parents:
24424
diff
changeset
|
884 |
if (owner == NULL) return owner_none; |
6975 | 885 |
return (owner == self || |
886 |
self->is_lock_owned((address)owner)) ? owner_self : owner_other; |
|
887 |
} |
|
888 |
||
889 |
// CASE: neutral |
|
890 |
assert(mark->is_neutral(), "sanity check"); |
|
25064
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parents:
24424
diff
changeset
|
891 |
return owner_none; // it's unlocked |
6975 | 892 |
} |
1 | 893 |
|
6975 | 894 |
// FIXME: jvmti should call this |
48105
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47634
diff
changeset
|
895 |
JavaThread* ObjectSynchronizer::get_lock_owner(ThreadsList * t_list, Handle h_obj) { |
6975 | 896 |
if (UseBiasedLocking) { |
897 |
if (SafepointSynchronize::is_at_safepoint()) { |
|
898 |
BiasedLocking::revoke_at_safepoint(h_obj); |
|
899 |
} else { |
|
900 |
BiasedLocking::revoke_and_rebias(h_obj, false, JavaThread::current()); |
|
901 |
} |
|
902 |
assert(!h_obj->mark()->has_bias_pattern(), "biases should be revoked by now"); |
|
903 |
} |
|
904 |
||
905 |
oop obj = h_obj(); |
|
906 |
address owner = NULL; |
|
907 |
||
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
908 |
markOop mark = ReadStableMark(obj); |
6975 | 909 |
|
910 |
// Uncontended case, header points to stack |
|
911 |
if (mark->has_locker()) { |
|
912 |
owner = (address) mark->locker(); |
|
913 |
} |
|
914 |
||
915 |
// Contended case, header points to ObjectMonitor (tagged pointer) |
|
916 |
if (mark->has_monitor()) { |
|
917 |
ObjectMonitor* monitor = mark->monitor(); |
|
918 |
assert(monitor != NULL, "monitor should be non-null"); |
|
919 |
owner = (address) monitor->owner(); |
|
920 |
} |
|
921 |
||
922 |
if (owner != NULL) { |
|
15853
1c4e16950e96
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
15475
diff
changeset
|
923 |
// owning_thread_from_monitor_owner() may also return NULL here |
48105
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47634
diff
changeset
|
924 |
return Threads::owning_thread_from_monitor_owner(t_list, owner); |
6975 | 925 |
} |
926 |
||
927 |
// Unlocked case, header in place |
|
928 |
// Cannot have assertion since this object may have been |
|
929 |
// locked by another thread when reaching here. |
|
930 |
// assert(mark->is_neutral(), "sanity check"); |
|
931 |
||
932 |
return NULL; |
|
933 |
} |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
934 |
|
6975 | 935 |
// Visitors ... |
936 |
||
937 |
void ObjectSynchronizer::monitors_iterate(MonitorClosure* closure) { |
|
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
938 |
PaddedEnd<ObjectMonitor> * block = OrderAccess::load_acquire(&gBlockList); |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
939 |
while (block != NULL) { |
6975 | 940 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
941 |
for (int i = _BLOCKSIZE - 1; i > 0; i--) { |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
942 |
ObjectMonitor* mid = (ObjectMonitor *)(block + i); |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
943 |
oop object = (oop)mid->object(); |
6975 | 944 |
if (object != NULL) { |
945 |
closure->do_monitor(mid); |
|
946 |
} |
|
947 |
} |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
948 |
block = (PaddedEnd<ObjectMonitor> *)block->FreeNext; |
1 | 949 |
} |
950 |
} |
|
951 |
||
6975 | 952 |
// Get the next block in the block list. |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
953 |
static inline PaddedEnd<ObjectMonitor>* next(PaddedEnd<ObjectMonitor>* block) { |
6975 | 954 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
955 |
block = (PaddedEnd<ObjectMonitor>*) block->FreeNext; |
6975 | 956 |
assert(block == NULL || block->object() == CHAINMARKER, "must be a block header"); |
957 |
return block; |
|
1 | 958 |
} |
959 |
||
46541
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
960 |
static bool monitors_used_above_threshold() { |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
961 |
if (gMonitorPopulation == 0) { |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
962 |
return false; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
963 |
} |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
964 |
int monitors_used = gMonitorPopulation - gMonitorFreeCount; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
965 |
int monitor_usage = (monitors_used * 100LL) / gMonitorPopulation; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
966 |
return monitor_usage > MonitorUsedDeflationThreshold; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
967 |
} |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
968 |
|
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
969 |
bool ObjectSynchronizer::is_cleanup_needed() { |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
970 |
if (MonitorUsedDeflationThreshold > 0) { |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
971 |
return monitors_used_above_threshold(); |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
972 |
} |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
973 |
return false; |
d20828de9e39
8181859: Monitor deflation is not checked in cleanup path
rehn
parents:
46495
diff
changeset
|
974 |
} |
1 | 975 |
|
6975 | 976 |
void ObjectSynchronizer::oops_do(OopClosure* f) { |
46474
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
977 |
if (MonitorInUseLists) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
978 |
// When using thread local monitor lists, we only scan the |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
979 |
// global used list here (for moribund threads), and |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
980 |
// the thread-local monitors in Thread::oops_do(). |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
981 |
global_used_oops_do(f); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
982 |
} else { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
983 |
global_oops_do(f); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
984 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
985 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
986 |
|
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
987 |
void ObjectSynchronizer::global_oops_do(OopClosure* f) { |
6975 | 988 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
989 |
PaddedEnd<ObjectMonitor> * block = OrderAccess::load_acquire(&gBlockList); |
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
990 |
for (; block != NULL; block = next(block)) { |
6975 | 991 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
992 |
for (int i = 1; i < _BLOCKSIZE; i++) { |
|
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
993 |
ObjectMonitor* mid = (ObjectMonitor *)&block[i]; |
6975 | 994 |
if (mid->object() != NULL) { |
995 |
f->do_oop((oop*)mid->object_addr()); |
|
1 | 996 |
} |
997 |
} |
|
998 |
} |
|
999 |
} |
|
1000 |
||
46474
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1001 |
void ObjectSynchronizer::global_used_oops_do(OopClosure* f) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1002 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1003 |
list_oops_do(gOmInUseList, f); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1004 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1005 |
|
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1006 |
void ObjectSynchronizer::thread_local_used_oops_do(Thread* thread, OopClosure* f) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1007 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1008 |
list_oops_do(thread->omInUseList, f); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1009 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1010 |
|
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1011 |
void ObjectSynchronizer::list_oops_do(ObjectMonitor* list, OopClosure* f) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1012 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1013 |
ObjectMonitor* mid; |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1014 |
for (mid = list; mid != NULL; mid = mid->FreeNext) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1015 |
if (mid->object() != NULL) { |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1016 |
f->do_oop((oop*)mid->object_addr()); |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1017 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1018 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1019 |
} |
c872a196b75f
8180175: ObjectSynchronizer only needs to iterate in-use monitors
rkennke
parents:
46342
diff
changeset
|
1020 |
|
1 | 1021 |
|
6975 | 1022 |
// ----------------------------------------------------------------------------- |
1 | 1023 |
// ObjectMonitor Lifecycle |
1024 |
// ----------------------- |
|
1025 |
// Inflation unlinks monitors from the global gFreeList and |
|
1026 |
// associates them with objects. Deflation -- which occurs at |
|
1027 |
// STW-time -- disassociates idle monitors from objects. Such |
|
1028 |
// scavenged monitors are returned to the gFreeList. |
|
1029 |
// |
|
30244 | 1030 |
// The global list is protected by gListLock. All the critical sections |
1 | 1031 |
// are short and operate in constant-time. |
1032 |
// |
|
1033 |
// ObjectMonitors reside in type-stable memory (TSM) and are immortal. |
|
1034 |
// |
|
1035 |
// Lifecycle: |
|
1036 |
// -- unassigned and on the global free list |
|
1037 |
// -- unassigned and on a thread's private omFreeList |
|
1038 |
// -- assigned to an object. The object is inflated and the mark refers |
|
1039 |
// to the objectmonitor. |
|
1040 |
||
1041 |
||
5710 | 1042 |
// Constraining monitor pool growth via MonitorBound ... |
1043 |
// |
|
1044 |
// The monitor pool is grow-only. We scavenge at STW safepoint-time, but the |
|
1045 |
// the rate of scavenging is driven primarily by GC. As such, we can find |
|
1046 |
// an inordinate number of monitors in circulation. |
|
1047 |
// To avoid that scenario we can artificially induce a STW safepoint |
|
1048 |
// if the pool appears to be growing past some reasonable bound. |
|
1049 |
// Generally we favor time in space-time tradeoffs, but as there's no |
|
1050 |
// natural back-pressure on the # of extant monitors we need to impose some |
|
1051 |
// type of limit. Beware that if MonitorBound is set to too low a value |
|
1052 |
// we could just loop. In addition, if MonitorBound is set to a low value |
|
1053 |
// we'll incur more safepoints, which are harmful to performance. |
|
1054 |
// See also: GuaranteedSafepointInterval |
|
1055 |
// |
|
1056 |
// The current implementation uses asynchronous VM operations. |
|
1057 |
||
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1058 |
static void InduceScavenge(Thread * Self, const char * Whence) { |
5710 | 1059 |
// Induce STW safepoint to trim monitors |
1060 |
// Ultimately, this results in a call to deflate_idle_monitors() in the near future. |
|
1061 |
// More precisely, trigger an asynchronous STW safepoint as the number |
|
1062 |
// of active monitors passes the specified threshold. |
|
1063 |
// TODO: assert thread state is reasonable |
|
1064 |
||
1065 |
if (ForceMonitorScavenge == 0 && Atomic::xchg (1, &ForceMonitorScavenge) == 0) { |
|
6975 | 1066 |
if (ObjectMonitor::Knob_Verbose) { |
31782
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1067 |
tty->print_cr("INFO: Monitor scavenge - Induced STW @%s (%d)", |
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1068 |
Whence, ForceMonitorScavenge) ; |
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1069 |
tty->flush(); |
5710 | 1070 |
} |
1071 |
// Induce a 'null' safepoint to scavenge monitors |
|
1072 |
// Must VM_Operation instance be heap allocated as the op will be enqueue and posted |
|
1073 |
// to the VMthread and have a lifespan longer than that of this activation record. |
|
1074 |
// The VMThread will delete the op when completed. |
|
46495
34f7d403039f
8152953: ForceSafepoint operations should be more specific
rehn
parents:
46484
diff
changeset
|
1075 |
VMThread::execute(new VM_ScavengeMonitors()); |
5710 | 1076 |
|
6975 | 1077 |
if (ObjectMonitor::Knob_Verbose) { |
31782
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1078 |
tty->print_cr("INFO: Monitor scavenge - STW posted @%s (%d)", |
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1079 |
Whence, ForceMonitorScavenge) ; |
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1080 |
tty->flush(); |
5710 | 1081 |
} |
1082 |
} |
|
1083 |
} |
|
25472
381638db28e6
8047104: cleanup misc issues prior to Contended Locking reorder and cache
dcubed
parents:
25468
diff
changeset
|
1084 |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1085 |
void ObjectSynchronizer::verifyInUse(Thread *Self) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1086 |
ObjectMonitor* mid; |
30244 | 1087 |
int in_use_tally = 0; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1088 |
for (mid = Self->omInUseList; mid != NULL; mid = mid->FreeNext) { |
30244 | 1089 |
in_use_tally++; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1090 |
} |
30244 | 1091 |
assert(in_use_tally == Self->omInUseCount, "in-use count off"); |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1092 |
|
30244 | 1093 |
int free_tally = 0; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1094 |
for (mid = Self->omFreeList; mid != NULL; mid = mid->FreeNext) { |
30244 | 1095 |
free_tally++; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1096 |
} |
30244 | 1097 |
assert(free_tally == Self->omFreeCount, "free count off"); |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1098 |
} |
25472
381638db28e6
8047104: cleanup misc issues prior to Contended Locking reorder and cache
dcubed
parents:
25468
diff
changeset
|
1099 |
|
37092
0e56e3c9d545
8151593: Cleanup definition/usage of INLINE/NOINLINE macros and add xlC support
simonis
parents:
35934
diff
changeset
|
1100 |
ObjectMonitor* ObjectSynchronizer::omAlloc(Thread * Self) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1101 |
// A large MAXPRIVATE value reduces both list lock contention |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1102 |
// and list coherency traffic, but also tends to increase the |
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|
1103 |
// number of objectMonitors in circulation as well as the STW |
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changeset
|
1104 |
// scavenge costs. As usual, we lean toward time in space-time |
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changeset
|
1105 |
// tradeoffs. |
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changeset
|
1106 |
const int MAXPRIVATE = 1024; |
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changeset
|
1107 |
for (;;) { |
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changeset
|
1108 |
ObjectMonitor * m; |
1 | 1109 |
|
26683
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changeset
|
1110 |
// 1: try to allocate from the thread's local omFreeList. |
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changeset
|
1111 |
// Threads will attempt to allocate first from their local list, then |
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changeset
|
1112 |
// from the global list, and only after those attempts fail will the thread |
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changeset
|
1113 |
// attempt to instantiate new monitors. Thread-local free lists take |
30244 | 1114 |
// heat off the gListLock and improve allocation latency, as well as reducing |
26683
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changeset
|
1115 |
// coherency traffic on the shared global list. |
a02753d5a0b2
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changeset
|
1116 |
m = Self->omFreeList; |
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changeset
|
1117 |
if (m != NULL) { |
a02753d5a0b2
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changeset
|
1118 |
Self->omFreeList = m->FreeNext; |
a02753d5a0b2
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changeset
|
1119 |
Self->omFreeCount--; |
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changeset
|
1120 |
// CONSIDER: set m->FreeNext = BAD -- diagnostic hygiene |
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changeset
|
1121 |
guarantee(m->object() == NULL, "invariant"); |
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changeset
|
1122 |
if (MonitorInUseLists) { |
a02753d5a0b2
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changeset
|
1123 |
m->FreeNext = Self->omInUseList; |
a02753d5a0b2
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changeset
|
1124 |
Self->omInUseList = m; |
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changeset
|
1125 |
Self->omInUseCount++; |
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changeset
|
1126 |
if (ObjectMonitor::Knob_VerifyInUse) { |
a02753d5a0b2
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changeset
|
1127 |
verifyInUse(Self); |
1 | 1128 |
} |
26683
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changeset
|
1129 |
} else { |
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changeset
|
1130 |
m->FreeNext = NULL; |
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changeset
|
1131 |
} |
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changeset
|
1132 |
return m; |
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changeset
|
1133 |
} |
1 | 1134 |
|
26683
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changeset
|
1135 |
// 2: try to allocate from the global gFreeList |
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changeset
|
1136 |
// CONSIDER: use muxTry() instead of muxAcquire(). |
a02753d5a0b2
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changeset
|
1137 |
// If the muxTry() fails then drop immediately into case 3. |
a02753d5a0b2
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changeset
|
1138 |
// If we're using thread-local free lists then try |
a02753d5a0b2
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changeset
|
1139 |
// to reprovision the caller's free list. |
a02753d5a0b2
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changeset
|
1140 |
if (gFreeList != NULL) { |
a02753d5a0b2
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changeset
|
1141 |
// Reprovision the thread's omFreeList. |
a02753d5a0b2
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changeset
|
1142 |
// Use bulk transfers to reduce the allocation rate and heat |
a02753d5a0b2
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changeset
|
1143 |
// on various locks. |
30244 | 1144 |
Thread::muxAcquire(&gListLock, "omAlloc"); |
26683
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changeset
|
1145 |
for (int i = Self->omFreeProvision; --i >= 0 && gFreeList != NULL;) { |
30244 | 1146 |
gMonitorFreeCount--; |
26683
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changeset
|
1147 |
ObjectMonitor * take = gFreeList; |
a02753d5a0b2
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changeset
|
1148 |
gFreeList = take->FreeNext; |
a02753d5a0b2
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changeset
|
1149 |
guarantee(take->object() == NULL, "invariant"); |
a02753d5a0b2
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changeset
|
1150 |
guarantee(!take->is_busy(), "invariant"); |
a02753d5a0b2
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changeset
|
1151 |
take->Recycle(); |
a02753d5a0b2
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changeset
|
1152 |
omRelease(Self, take, false); |
a02753d5a0b2
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changeset
|
1153 |
} |
30244 | 1154 |
Thread::muxRelease(&gListLock); |
26683
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changeset
|
1155 |
Self->omFreeProvision += 1 + (Self->omFreeProvision/2); |
a02753d5a0b2
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changeset
|
1156 |
if (Self->omFreeProvision > MAXPRIVATE) Self->omFreeProvision = MAXPRIVATE; |
a02753d5a0b2
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changeset
|
1157 |
TEVENT(omFirst - reprovision); |
5710 | 1158 |
|
26683
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changeset
|
1159 |
const int mx = MonitorBound; |
30244 | 1160 |
if (mx > 0 && (gMonitorPopulation-gMonitorFreeCount) > mx) { |
26683
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changeset
|
1161 |
// We can't safely induce a STW safepoint from omAlloc() as our thread |
a02753d5a0b2
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changeset
|
1162 |
// state may not be appropriate for such activities and callers may hold |
a02753d5a0b2
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changeset
|
1163 |
// naked oops, so instead we defer the action. |
a02753d5a0b2
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changeset
|
1164 |
InduceScavenge(Self, "omAlloc"); |
a02753d5a0b2
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changeset
|
1165 |
} |
a02753d5a0b2
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changeset
|
1166 |
continue; |
a02753d5a0b2
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changeset
|
1167 |
} |
1 | 1168 |
|
26683
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changeset
|
1169 |
// 3: allocate a block of new ObjectMonitors |
a02753d5a0b2
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changeset
|
1170 |
// Both the local and global free lists are empty -- resort to malloc(). |
a02753d5a0b2
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changeset
|
1171 |
// In the current implementation objectMonitors are TSM - immortal. |
27165
785a8d56024c
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diff
changeset
|
1172 |
// Ideally, we'd write "new ObjectMonitor[_BLOCKSIZE], but we want |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
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26684
diff
changeset
|
1173 |
// each ObjectMonitor to start at the beginning of a cache line, |
46619
a3919f5e8d2b
8178499: Remove _ptr_ and _size_ infixes from align functions
stefank
parents:
46618
diff
changeset
|
1174 |
// so we use align_up(). |
27165
785a8d56024c
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dcubed
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26684
diff
changeset
|
1175 |
// A better solution would be to use C++ placement-new. |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1176 |
// BEWARE: As it stands currently, we don't run the ctors! |
26683
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diff
changeset
|
1177 |
assert(_BLOCKSIZE > 1, "invariant"); |
27165
785a8d56024c
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diff
changeset
|
1178 |
size_t neededsize = sizeof(PaddedEnd<ObjectMonitor>) * _BLOCKSIZE; |
785a8d56024c
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diff
changeset
|
1179 |
PaddedEnd<ObjectMonitor> * temp; |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
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parents:
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diff
changeset
|
1180 |
size_t aligned_size = neededsize + (DEFAULT_CACHE_LINE_SIZE - 1); |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
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parents:
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diff
changeset
|
1181 |
void* real_malloc_addr = (void *)NEW_C_HEAP_ARRAY(char, aligned_size, |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
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parents:
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diff
changeset
|
1182 |
mtInternal); |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
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parents:
26684
diff
changeset
|
1183 |
temp = (PaddedEnd<ObjectMonitor> *) |
46619
a3919f5e8d2b
8178499: Remove _ptr_ and _size_ infixes from align functions
stefank
parents:
46618
diff
changeset
|
1184 |
align_up(real_malloc_addr, DEFAULT_CACHE_LINE_SIZE); |
1 | 1185 |
|
26683
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diff
changeset
|
1186 |
// NOTE: (almost) no way to recover if allocation failed. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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25633
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changeset
|
1187 |
// We might be able to induce a STW safepoint and scavenge enough |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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25633
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changeset
|
1188 |
// objectMonitors to permit progress. |
a02753d5a0b2
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25633
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changeset
|
1189 |
if (temp == NULL) { |
27165
785a8d56024c
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parents:
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diff
changeset
|
1190 |
vm_exit_out_of_memory(neededsize, OOM_MALLOC_ERROR, |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
1191 |
"Allocate ObjectMonitors"); |
a02753d5a0b2
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diff
changeset
|
1192 |
} |
27165
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changeset
|
1193 |
(void)memset((void *) temp, 0, neededsize); |
1 | 1194 |
|
26683
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changeset
|
1195 |
// Format the block. |
a02753d5a0b2
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25633
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changeset
|
1196 |
// initialize the linked list, each monitor points to its next |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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25633
diff
changeset
|
1197 |
// forming the single linked free list, the very first monitor |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
1198 |
// will points to next block, which forms the block list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
1199 |
// The trick of using the 1st element in the block as gBlockList |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
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changeset
|
1200 |
// linkage should be reconsidered. A better implementation would |
a02753d5a0b2
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25633
diff
changeset
|
1201 |
// look like: class Block { Block * next; int N; ObjectMonitor Body [N] ; } |
1 | 1202 |
|
26683
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changeset
|
1203 |
for (int i = 1; i < _BLOCKSIZE; i++) { |
27165
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parents:
26684
diff
changeset
|
1204 |
temp[i].FreeNext = (ObjectMonitor *)&temp[i+1]; |
26683
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8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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changeset
|
1205 |
} |
1 | 1206 |
|
26683
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25633
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changeset
|
1207 |
// terminate the last monitor as the end of list |
a02753d5a0b2
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changeset
|
1208 |
temp[_BLOCKSIZE - 1].FreeNext = NULL; |
1 | 1209 |
|
26683
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changeset
|
1210 |
// Element [0] is reserved for global list linkage |
a02753d5a0b2
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changeset
|
1211 |
temp[0].set_object(CHAINMARKER); |
1 | 1212 |
|
26683
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changeset
|
1213 |
// Consider carving out this thread's current request from the |
a02753d5a0b2
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changeset
|
1214 |
// block in hand. This avoids some lock traffic and redundant |
a02753d5a0b2
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changeset
|
1215 |
// list activity. |
1 | 1216 |
|
30244 | 1217 |
// Acquire the gListLock to manipulate gBlockList and gFreeList. |
26683
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changeset
|
1218 |
// An Oyama-Taura-Yonezawa scheme might be more efficient. |
30244 | 1219 |
Thread::muxAcquire(&gListLock, "omAlloc [2]"); |
1220 |
gMonitorPopulation += _BLOCKSIZE-1; |
|
1221 |
gMonitorFreeCount += _BLOCKSIZE-1; |
|
1 | 1222 |
|
26683
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changeset
|
1223 |
// Add the new block to the list of extant blocks (gBlockList). |
a02753d5a0b2
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changeset
|
1224 |
// The very first objectMonitor in a block is reserved and dedicated. |
a02753d5a0b2
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changeset
|
1225 |
// It serves as blocklist "next" linkage. |
a02753d5a0b2
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changeset
|
1226 |
temp[0].FreeNext = gBlockList; |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1227 |
// There are lock-free uses of gBlockList so make sure that |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1228 |
// the previous stores happen before we update gBlockList. |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
1229 |
OrderAccess::release_store(&gBlockList, temp); |
1 | 1230 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1231 |
// Add the new string of objectMonitors to the global free list |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1232 |
temp[_BLOCKSIZE - 1].FreeNext = gFreeList; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1233 |
gFreeList = temp + 1; |
30244 | 1234 |
Thread::muxRelease(&gListLock); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1235 |
TEVENT(Allocate block of monitors); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1236 |
} |
1 | 1237 |
} |
1238 |
||
1239 |
// Place "m" on the caller's private per-thread omFreeList. |
|
1240 |
// In practice there's no need to clamp or limit the number of |
|
1241 |
// monitors on a thread's omFreeList as the only time we'll call |
|
1242 |
// omRelease is to return a monitor to the free list after a CAS |
|
1243 |
// attempt failed. This doesn't allow unbounded #s of monitors to |
|
1244 |
// accumulate on a thread's free list. |
|
30244 | 1245 |
// |
1246 |
// Key constraint: all ObjectMonitors on a thread's free list and the global |
|
1247 |
// free list must have their object field set to null. This prevents the |
|
1248 |
// scavenger -- deflate_idle_monitors -- from reclaiming them. |
|
1 | 1249 |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1250 |
void ObjectSynchronizer::omRelease(Thread * Self, ObjectMonitor * m, |
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1251 |
bool fromPerThreadAlloc) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1252 |
guarantee(m->object() == NULL, "invariant"); |
30244 | 1253 |
guarantee(((m->is_busy()|m->_recursions) == 0), "freeing in-use monitor"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1254 |
// Remove from omInUseList |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1255 |
if (MonitorInUseLists && fromPerThreadAlloc) { |
30244 | 1256 |
ObjectMonitor* cur_mid_in_use = NULL; |
1257 |
bool extracted = false; |
|
1258 |
for (ObjectMonitor* mid = Self->omInUseList; mid != NULL; cur_mid_in_use = mid, mid = mid->FreeNext) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1259 |
if (m == mid) { |
30244 | 1260 |
// extract from per-thread in-use list |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1261 |
if (mid == Self->omInUseList) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1262 |
Self->omInUseList = mid->FreeNext; |
30244 | 1263 |
} else if (cur_mid_in_use != NULL) { |
1264 |
cur_mid_in_use->FreeNext = mid->FreeNext; // maintain the current thread in-use list |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1265 |
} |
30244 | 1266 |
extracted = true; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1267 |
Self->omInUseCount--; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1268 |
if (ObjectMonitor::Knob_VerifyInUse) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1269 |
verifyInUse(Self); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1270 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1271 |
break; |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1272 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1273 |
} |
30244 | 1274 |
assert(extracted, "Should have extracted from in-use list"); |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1275 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1276 |
|
25472
381638db28e6
8047104: cleanup misc issues prior to Contended Locking reorder and cache
dcubed
parents:
25468
diff
changeset
|
1277 |
// FreeNext is used for both omInUseList and omFreeList, so clear old before setting new |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1278 |
m->FreeNext = Self->omFreeList; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1279 |
Self->omFreeList = m; |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1280 |
Self->omFreeCount++; |
1 | 1281 |
} |
1282 |
||
1283 |
// Return the monitors of a moribund thread's local free list to |
|
1284 |
// the global free list. Typically a thread calls omFlush() when |
|
1285 |
// it's dying. We could also consider having the VM thread steal |
|
1286 |
// monitors from threads that have not run java code over a few |
|
1287 |
// consecutive STW safepoints. Relatedly, we might decay |
|
1288 |
// omFreeProvision at STW safepoints. |
|
1289 |
// |
|
25472
381638db28e6
8047104: cleanup misc issues prior to Contended Locking reorder and cache
dcubed
parents:
25468
diff
changeset
|
1290 |
// Also return the monitors of a moribund thread's omInUseList to |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1291 |
// a global gOmInUseList under the global list lock so these |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1292 |
// will continue to be scanned. |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1293 |
// |
46484
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1294 |
// We currently call omFlush() from Threads::remove() _before the thread |
1 | 1295 |
// has been excised from the thread list and is no longer a mutator. |
46484
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1296 |
// This means that omFlush() can not run concurrently with a safepoint and |
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1297 |
// interleave with the scavenge operator. In particular, this ensures that |
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1298 |
// the thread's monitors are scanned by a GC safepoint, either via |
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1299 |
// Thread::oops_do() (if safepoint happens before omFlush()) or via |
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1300 |
// ObjectSynchronizer::oops_do() (if it happens after omFlush() and the thread's |
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1301 |
// monitors have been transferred to the global in-use list). |
1 | 1302 |
|
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1303 |
void ObjectSynchronizer::omFlush(Thread * Self) { |
30244 | 1304 |
ObjectMonitor * list = Self->omFreeList; // Null-terminated SLL |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1305 |
Self->omFreeList = NULL; |
30244 | 1306 |
ObjectMonitor * tail = NULL; |
1307 |
int tally = 0; |
|
1308 |
if (list != NULL) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1309 |
ObjectMonitor * s; |
30244 | 1310 |
// The thread is going away, the per-thread free monitors |
1311 |
// are freed via set_owner(NULL) |
|
1312 |
// Link them to tail, which will be linked into the global free list |
|
1313 |
// gFreeList below, under the gListLock |
|
1314 |
for (s = list; s != NULL; s = s->FreeNext) { |
|
1315 |
tally++; |
|
1316 |
tail = s; |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1317 |
guarantee(s->object() == NULL, "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1318 |
guarantee(!s->is_busy(), "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1319 |
s->set_owner(NULL); // redundant but good hygiene |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1320 |
TEVENT(omFlush - Move one); |
1 | 1321 |
} |
30244 | 1322 |
guarantee(tail != NULL && list != NULL, "invariant"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1323 |
} |
1 | 1324 |
|
30244 | 1325 |
ObjectMonitor * inUseList = Self->omInUseList; |
1326 |
ObjectMonitor * inUseTail = NULL; |
|
1327 |
int inUseTally = 0; |
|
1328 |
if (inUseList != NULL) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1329 |
Self->omInUseList = NULL; |
30244 | 1330 |
ObjectMonitor *cur_om; |
1331 |
// The thread is going away, however the omInUseList inflated |
|
1332 |
// monitors may still be in-use by other threads. |
|
1333 |
// Link them to inUseTail, which will be linked into the global in-use list |
|
1334 |
// gOmInUseList below, under the gListLock |
|
1335 |
for (cur_om = inUseList; cur_om != NULL; cur_om = cur_om->FreeNext) { |
|
1336 |
inUseTail = cur_om; |
|
1337 |
inUseTally++; |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1338 |
} |
30244 | 1339 |
assert(Self->omInUseCount == inUseTally, "in-use count off"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1340 |
Self->omInUseCount = 0; |
30244 | 1341 |
guarantee(inUseTail != NULL && inUseList != NULL, "invariant"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1342 |
} |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1343 |
|
30244 | 1344 |
Thread::muxAcquire(&gListLock, "omFlush"); |
1345 |
if (tail != NULL) { |
|
1346 |
tail->FreeNext = gFreeList; |
|
1347 |
gFreeList = list; |
|
1348 |
gMonitorFreeCount += tally; |
|
46484
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1349 |
assert(Self->omFreeCount == tally, "free-count off"); |
688e3a206b86
8180599: Possibly miss to iterate monitors on thread exit
rkennke
parents:
46474
diff
changeset
|
1350 |
Self->omFreeCount = 0; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1351 |
} |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1352 |
|
30244 | 1353 |
if (inUseTail != NULL) { |
1354 |
inUseTail->FreeNext = gOmInUseList; |
|
1355 |
gOmInUseList = inUseList; |
|
1356 |
gOmInUseCount += inUseTally; |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1357 |
} |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1358 |
|
30244 | 1359 |
Thread::muxRelease(&gListLock); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1360 |
TEVENT(omFlush); |
1 | 1361 |
} |
1362 |
||
50113 | 1363 |
static void post_monitor_inflate_event(EventJavaMonitorInflate* event, |
1364 |
const oop obj, |
|
1365 |
ObjectSynchronizer::InflateCause cause) { |
|
1366 |
assert(event != NULL, "invariant"); |
|
1367 |
assert(event->should_commit(), "invariant"); |
|
1368 |
event->set_monitorClass(obj->klass()); |
|
1369 |
event->set_address((uintptr_t)(void*)obj); |
|
1370 |
event->set_cause((u1)cause); |
|
1371 |
event->commit(); |
|
1372 |
} |
|
1373 |
||
1 | 1374 |
// Fast path code shared by multiple functions |
1375 |
ObjectMonitor* ObjectSynchronizer::inflate_helper(oop obj) { |
|
1376 |
markOop mark = obj->mark(); |
|
1377 |
if (mark->has_monitor()) { |
|
1378 |
assert(ObjectSynchronizer::verify_objmon_isinpool(mark->monitor()), "monitor is invalid"); |
|
1379 |
assert(mark->monitor()->header()->is_neutral(), "monitor must record a good object header"); |
|
1380 |
return mark->monitor(); |
|
1381 |
} |
|
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1382 |
return ObjectSynchronizer::inflate(Thread::current(), |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1383 |
obj, |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1384 |
inflate_cause_vm_internal); |
1 | 1385 |
} |
1386 |
||
37092
0e56e3c9d545
8151593: Cleanup definition/usage of INLINE/NOINLINE macros and add xlC support
simonis
parents:
35934
diff
changeset
|
1387 |
ObjectMonitor* ObjectSynchronizer::inflate(Thread * Self, |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1388 |
oop object, |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1389 |
const InflateCause cause) { |
6975 | 1390 |
|
1 | 1391 |
// Inflate mutates the heap ... |
1392 |
// Relaxing assertion for bug 6320749. |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1393 |
assert(Universe::verify_in_progress() || |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1394 |
!SafepointSynchronize::is_at_safepoint(), "invariant"); |
1 | 1395 |
|
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1396 |
EventJavaMonitorInflate event; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1397 |
|
1 | 1398 |
for (;;) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1399 |
const markOop mark = object->mark(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1400 |
assert(!mark->has_bias_pattern(), "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1401 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1402 |
// The mark can be in one of the following states: |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1403 |
// * Inflated - just return |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1404 |
// * Stack-locked - coerce it to inflated |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1405 |
// * INFLATING - busy wait for conversion to complete |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1406 |
// * Neutral - aggressively inflate the object. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1407 |
// * BIASED - Illegal. We should never see this |
1 | 1408 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1409 |
// CASE: inflated |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1410 |
if (mark->has_monitor()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1411 |
ObjectMonitor * inf = mark->monitor(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
1412 |
assert(inf->header()->is_neutral(), "invariant"); |
49658 | 1413 |
assert(oopDesc::equals((oop) inf->object(), object), "invariant"); |
26683
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diff
changeset
|
1414 |
assert(ObjectSynchronizer::verify_objmon_isinpool(inf), "monitor is invalid"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
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diff
changeset
|
1415 |
return inf; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
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25633
diff
changeset
|
1416 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1417 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1418 |
// CASE: inflation in progress - inflating over a stack-lock. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1419 |
// Some other thread is converting from stack-locked to inflated. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1420 |
// Only that thread can complete inflation -- other threads must wait. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1421 |
// The INFLATING value is transient. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1422 |
// Currently, we spin/yield/park and poll the markword, waiting for inflation to finish. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1423 |
// We could always eliminate polling by parking the thread on some auxiliary list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1424 |
if (mark == markOopDesc::INFLATING()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1425 |
TEVENT(Inflate: spin while INFLATING); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1426 |
ReadStableMark(object); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1427 |
continue; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1428 |
} |
1 | 1429 |
|
26683
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25633
diff
changeset
|
1430 |
// CASE: stack-locked |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
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25633
diff
changeset
|
1431 |
// Could be stack-locked either by this thread or by some other thread. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1432 |
// |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1433 |
// Note that we allocate the objectmonitor speculatively, _before_ attempting |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1434 |
// to install INFLATING into the mark word. We originally installed INFLATING, |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1435 |
// allocated the objectmonitor, and then finally STed the address of the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1436 |
// objectmonitor into the mark. This was correct, but artificially lengthened |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1437 |
// the interval in which INFLATED appeared in the mark, thus increasing |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1438 |
// the odds of inflation contention. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1439 |
// |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1440 |
// We now use per-thread private objectmonitor free lists. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1441 |
// These list are reprovisioned from the global free list outside the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1442 |
// critical INFLATING...ST interval. A thread can transfer |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1443 |
// multiple objectmonitors en-mass from the global free list to its local free list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1444 |
// This reduces coherency traffic and lock contention on the global free list. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1445 |
// Using such local free lists, it doesn't matter if the omAlloc() call appears |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1446 |
// before or after the CAS(INFLATING) operation. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1447 |
// See the comments in omAlloc(). |
1 | 1448 |
|
26683
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8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1449 |
if (mark->has_locker()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1450 |
ObjectMonitor * m = omAlloc(Self); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1451 |
// Optimistically prepare the objectmonitor - anticipate successful CAS |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1452 |
// We do this before the CAS in order to minimize the length of time |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1453 |
// in which INFLATING appears in the mark. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1454 |
m->Recycle(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1455 |
m->_Responsible = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1456 |
m->_recursions = 0; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1457 |
m->_SpinDuration = ObjectMonitor::Knob_SpinLimit; // Consider: maintain by type/class |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1458 |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
1459 |
markOop cmp = object->cas_set_mark(markOopDesc::INFLATING(), mark); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1460 |
if (cmp != mark) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1461 |
omRelease(Self, m, true); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1462 |
continue; // Interference -- just retry |
1 | 1463 |
} |
1464 |
||
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1465 |
// We've successfully installed INFLATING (0) into the mark-word. |
32623
390a27af5657
8134626: Misc cleanups after generation array removal
jwilhelm
parents:
32614
diff
changeset
|
1466 |
// This is the only case where 0 will appear in a mark-word. |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1467 |
// Only the singular thread that successfully swings the mark-word |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1468 |
// to 0 can perform (or more precisely, complete) inflation. |
1 | 1469 |
// |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1470 |
// Why do we CAS a 0 into the mark-word instead of just CASing the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1471 |
// mark-word from the stack-locked value directly to the new inflated state? |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1472 |
// Consider what happens when a thread unlocks a stack-locked object. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1473 |
// It attempts to use CAS to swing the displaced header value from the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1474 |
// on-stack basiclock back into the object header. Recall also that the |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1475 |
// header value (hashcode, etc) can reside in (a) the object header, or |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1476 |
// (b) a displaced header associated with the stack-lock, or (c) a displaced |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1477 |
// header in an objectMonitor. The inflate() routine must copy the header |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1478 |
// value from the basiclock on the owner's stack to the objectMonitor, all |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1479 |
// the while preserving the hashCode stability invariants. If the owner |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1480 |
// decides to release the lock while the value is 0, the unlock will fail |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1481 |
// and control will eventually pass from slow_exit() to inflate. The owner |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1482 |
// will then spin, waiting for the 0 value to disappear. Put another way, |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1483 |
// the 0 causes the owner to stall if the owner happens to try to |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1484 |
// drop the lock (restoring the header from the basiclock to the object) |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1485 |
// while inflation is in-progress. This protocol avoids races that might |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1486 |
// would otherwise permit hashCode values to change or "flicker" for an object. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1487 |
// Critically, while object->mark is 0 mark->displaced_mark_helper() is stable. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1488 |
// 0 serves as a "BUSY" inflate-in-progress indicator. |
1 | 1489 |
|
1490 |
||
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1491 |
// fetch the displaced mark from the owner's stack. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1492 |
// The owner can't die or unwind past the lock while our INFLATING |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1493 |
// object is in the mark. Furthermore the owner can't complete |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1494 |
// an unlock on the object, either. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1495 |
markOop dmw = mark->displaced_mark_helper(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1496 |
assert(dmw->is_neutral(), "invariant"); |
1 | 1497 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1498 |
// Setup monitor fields to proper values -- prepare the monitor |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1499 |
m->set_header(dmw); |
1 | 1500 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1501 |
// Optimization: if the mark->locker stack address is associated |
27165
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1502 |
// with this thread we could simply set m->_owner = Self. |
785a8d56024c
8049737: Contended Locking reorder and cache line bucket
dcubed
parents:
26684
diff
changeset
|
1503 |
// Note that a thread can inflate an object |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1504 |
// that it has stack-locked -- as might happen in wait() -- directly |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1505 |
// with CAS. That is, we can avoid the xchg-NULL .... ST idiom. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1506 |
m->set_owner(mark->locker()); |
1 | 1507 |
m->set_object(object); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1508 |
// TODO-FIXME: assert BasicLock->dhw != 0. |
1 | 1509 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1510 |
// Must preserve store ordering. The monitor state must |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1511 |
// be stable at the time of publishing the monitor address. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1512 |
guarantee(object->mark() == markOopDesc::INFLATING(), "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1513 |
object->release_set_mark(markOopDesc::encode(m)); |
1 | 1514 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1515 |
// Hopefully the performance counters are allocated on distinct cache lines |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1516 |
// to avoid false sharing on MP systems ... |
32614
b7b2407bc7e5
8049304: race between VM_Exit and _sync_FutileWakeups->inc()
dcubed
parents:
31856
diff
changeset
|
1517 |
OM_PERFDATA_OP(Inflations, inc()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1518 |
TEVENT(Inflate: overwrite stacklock); |
35171
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1519 |
if (log_is_enabled(Debug, monitorinflation)) { |
1 | 1520 |
if (object->is_instance()) { |
1521 |
ResourceMark rm; |
|
35171
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1522 |
log_debug(monitorinflation)("Inflating object " INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s", |
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1523 |
p2i(object), p2i(object->mark()), |
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1524 |
object->klass()->external_name()); |
1 | 1525 |
} |
1526 |
} |
|
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1527 |
if (event.should_commit()) { |
50113 | 1528 |
post_monitor_inflate_event(&event, object, cause); |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1529 |
} |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1530 |
return m; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1531 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1532 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1533 |
// CASE: neutral |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1534 |
// TODO-FIXME: for entry we currently inflate and then try to CAS _owner. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1535 |
// If we know we're inflating for entry it's better to inflate by swinging a |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1536 |
// pre-locked objectMonitor pointer into the object header. A successful |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1537 |
// CAS inflates the object *and* confers ownership to the inflating thread. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1538 |
// In the current implementation we use a 2-step mechanism where we CAS() |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1539 |
// to inflate and then CAS() again to try to swing _owner from NULL to Self. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1540 |
// An inflateTry() method that we could call from fast_enter() and slow_enter() |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1541 |
// would be useful. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1542 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1543 |
assert(mark->is_neutral(), "invariant"); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
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25633
diff
changeset
|
1544 |
ObjectMonitor * m = omAlloc(Self); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1545 |
// prepare m for installation - set monitor to initial state |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1546 |
m->Recycle(); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1547 |
m->set_header(mark); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1548 |
m->set_owner(NULL); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1549 |
m->set_object(object); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1550 |
m->_recursions = 0; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1551 |
m->_Responsible = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1552 |
m->_SpinDuration = ObjectMonitor::Knob_SpinLimit; // consider: keep metastats by type/class |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1553 |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
46625
diff
changeset
|
1554 |
if (object->cas_set_mark(markOopDesc::encode(m), mark) != mark) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
1555 |
m->set_object(NULL); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
1556 |
m->set_owner(NULL); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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diff
changeset
|
1557 |
m->Recycle(); |
a02753d5a0b2
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25633
diff
changeset
|
1558 |
omRelease(Self, m, true); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
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parents:
25633
diff
changeset
|
1559 |
m = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1560 |
continue; |
a02753d5a0b2
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dcubed
parents:
25633
diff
changeset
|
1561 |
// interference - the markword changed - just retry. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1562 |
// The state-transitions are one-way, so there's no chance of |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1563 |
// live-lock -- "Inflated" is an absorbing state. |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1564 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1565 |
|
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1566 |
// Hopefully the performance counters are allocated on distinct |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1567 |
// cache lines to avoid false sharing on MP systems ... |
32614
b7b2407bc7e5
8049304: race between VM_Exit and _sync_FutileWakeups->inc()
dcubed
parents:
31856
diff
changeset
|
1568 |
OM_PERFDATA_OP(Inflations, inc()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1569 |
TEVENT(Inflate: overwrite neutral); |
35171
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1570 |
if (log_is_enabled(Debug, monitorinflation)) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1571 |
if (object->is_instance()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1572 |
ResourceMark rm; |
35171
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1573 |
log_debug(monitorinflation)("Inflating object " INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s", |
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1574 |
p2i(object), p2i(object->mark()), |
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1575 |
object->klass()->external_name()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1576 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1577 |
} |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1578 |
if (event.should_commit()) { |
50113 | 1579 |
post_monitor_inflate_event(&event, object, cause); |
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1580 |
} |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1581 |
return m; |
1 | 1582 |
} |
1583 |
} |
|
1584 |
||
1585 |
||
1586 |
// Deflate_idle_monitors() is called at all safepoints, immediately |
|
1587 |
// after all mutators are stopped, but before any objects have moved. |
|
1588 |
// It traverses the list of known monitors, deflating where possible. |
|
1589 |
// The scavenged monitor are returned to the monitor free list. |
|
1590 |
// |
|
1591 |
// Beware that we scavenge at *every* stop-the-world point. |
|
1592 |
// Having a large number of monitors in-circulation negatively |
|
1593 |
// impacts the performance of some applications (e.g., PointBase). |
|
1594 |
// Broadly, we want to minimize the # of monitors in circulation. |
|
5710 | 1595 |
// |
1596 |
// We have added a flag, MonitorInUseLists, which creates a list |
|
1597 |
// of active monitors for each thread. deflate_idle_monitors() |
|
30244 | 1598 |
// only scans the per-thread in-use lists. omAlloc() puts all |
5710 | 1599 |
// assigned monitors on the per-thread list. deflate_idle_monitors() |
1600 |
// returns the non-busy monitors to the global free list. |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1601 |
// When a thread dies, omFlush() adds the list of active monitors for |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1602 |
// that thread to a global gOmInUseList acquiring the |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1603 |
// global list lock. deflate_idle_monitors() acquires the global |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1604 |
// list lock to scan for non-busy monitors to the global free list. |
30244 | 1605 |
// An alternative could have used a single global in-use list. The |
5710 | 1606 |
// downside would have been the additional cost of acquiring the global list lock |
1607 |
// for every omAlloc(). |
|
1 | 1608 |
// |
1609 |
// Perversely, the heap size -- and thus the STW safepoint rate -- |
|
1610 |
// typically drives the scavenge rate. Large heaps can mean infrequent GC, |
|
1611 |
// which in turn can mean large(r) numbers of objectmonitors in circulation. |
|
1612 |
// This is an unfortunate aspect of this design. |
|
1613 |
||
6975 | 1614 |
enum ManifestConstants { |
31856 | 1615 |
ClearResponsibleAtSTW = 0 |
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1616 |
}; |
5710 | 1617 |
|
30244 | 1618 |
// Deflate a single monitor if not in-use |
1619 |
// Return true if deflated, false if in-use |
|
5710 | 1620 |
bool ObjectSynchronizer::deflate_monitor(ObjectMonitor* mid, oop obj, |
26684
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1621 |
ObjectMonitor** freeHeadp, |
d1221849ea3d
8057109: manual cleanup of white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
26683
diff
changeset
|
1622 |
ObjectMonitor** freeTailp) { |
5710 | 1623 |
bool deflated; |
1624 |
// Normal case ... The monitor is associated with obj. |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1625 |
guarantee(obj->mark() == markOopDesc::encode(mid), "invariant"); |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1626 |
guarantee(mid == obj->mark()->monitor(), "invariant"); |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1627 |
guarantee(mid->header()->is_neutral(), "invariant"); |
5710 | 1628 |
|
1629 |
if (mid->is_busy()) { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1630 |
if (ClearResponsibleAtSTW) mid->_Responsible = NULL; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1631 |
deflated = false; |
5710 | 1632 |
} else { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1633 |
// Deflate the monitor if it is no longer being used |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1634 |
// It's idle - scavenge and return to the global free list |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1635 |
// plain old deflation ... |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1636 |
TEVENT(deflate_idle_monitors - scavenge1); |
35171
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1637 |
if (log_is_enabled(Debug, monitorinflation)) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1638 |
if (obj->is_instance()) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1639 |
ResourceMark rm; |
35171
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1640 |
log_debug(monitorinflation)("Deflating object " INTPTR_FORMAT " , " |
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1641 |
"mark " INTPTR_FORMAT " , type %s", |
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1642 |
p2i(obj), p2i(obj->mark()), |
cf7d5a1d0662
8145153: Convert TraceMonitorInflation to Unified Logging
rprotacio
parents:
33595
diff
changeset
|
1643 |
obj->klass()->external_name()); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1644 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1645 |
} |
5710 | 1646 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1647 |
// Restore the header back to obj |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1648 |
obj->release_set_mark(mid->header()); |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1649 |
mid->clear(); |
5710 | 1650 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1651 |
assert(mid->object() == NULL, "invariant"); |
5710 | 1652 |
|
30244 | 1653 |
// Move the object to the working free list defined by freeHeadp, freeTailp |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1654 |
if (*freeHeadp == NULL) *freeHeadp = mid; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1655 |
if (*freeTailp != NULL) { |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1656 |
ObjectMonitor * prevtail = *freeTailp; |
30244 | 1657 |
assert(prevtail->FreeNext == NULL, "cleaned up deflated?"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1658 |
prevtail->FreeNext = mid; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1659 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1660 |
*freeTailp = mid; |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1661 |
deflated = true; |
5710 | 1662 |
} |
1663 |
return deflated; |
|
1664 |
} |
|
1665 |
||
30244 | 1666 |
// Walk a given monitor list, and deflate idle monitors |
1667 |
// The given list could be a per-thread list or a global list |
|
46702 | 1668 |
// Caller acquires gListLock. |
1669 |
// |
|
1670 |
// In the case of parallel processing of thread local monitor lists, |
|
1671 |
// work is done by Threads::parallel_threads_do() which ensures that |
|
1672 |
// each Java thread is processed by exactly one worker thread, and |
|
1673 |
// thus avoid conflicts that would arise when worker threads would |
|
1674 |
// process the same monitor lists concurrently. |
|
1675 |
// |
|
1676 |
// See also ParallelSPCleanupTask and |
|
46732
05423d4b10d2
8185273: Test8004741.java crashes with SIGSEGV in JDK10-hs nightly
dcubed
parents:
46702
diff
changeset
|
1677 |
// SafepointSynchronize::do_cleanup_tasks() in safepoint.cpp and |
46702 | 1678 |
// Threads::parallel_java_threads_do() in thread.cpp. |
30244 | 1679 |
int ObjectSynchronizer::deflate_monitor_list(ObjectMonitor** listHeadp, |
1680 |
ObjectMonitor** freeHeadp, |
|
1681 |
ObjectMonitor** freeTailp) { |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1682 |
ObjectMonitor* mid; |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1683 |
ObjectMonitor* next; |
30244 | 1684 |
ObjectMonitor* cur_mid_in_use = NULL; |
1685 |
int deflated_count = 0; |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1686 |
|
30244 | 1687 |
for (mid = *listHeadp; mid != NULL;) { |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1688 |
oop obj = (oop) mid->object(); |
30244 | 1689 |
if (obj != NULL && deflate_monitor(mid, obj, freeHeadp, freeTailp)) { |
1690 |
// if deflate_monitor succeeded, |
|
1691 |
// extract from per-thread in-use list |
|
1692 |
if (mid == *listHeadp) { |
|
1693 |
*listHeadp = mid->FreeNext; |
|
1694 |
} else if (cur_mid_in_use != NULL) { |
|
1695 |
cur_mid_in_use->FreeNext = mid->FreeNext; // maintain the current thread in-use list |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1696 |
} |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1697 |
next = mid->FreeNext; |
30244 | 1698 |
mid->FreeNext = NULL; // This mid is current tail in the freeHeadp list |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1699 |
mid = next; |
30244 | 1700 |
deflated_count++; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1701 |
} else { |
30244 | 1702 |
cur_mid_in_use = mid; |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1703 |
mid = mid->FreeNext; |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1704 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1705 |
} |
30244 | 1706 |
return deflated_count; |
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1707 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1708 |
|
46702 | 1709 |
void ObjectSynchronizer::prepare_deflate_idle_monitors(DeflateMonitorCounters* counters) { |
1710 |
counters->nInuse = 0; // currently associated with objects |
|
1711 |
counters->nInCirculation = 0; // extant |
|
1712 |
counters->nScavenged = 0; // reclaimed |
|
1713 |
} |
|
1714 |
||
1715 |
void ObjectSynchronizer::deflate_idle_monitors(DeflateMonitorCounters* counters) { |
|
1 | 1716 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
5710 | 1717 |
bool deflated = false; |
1 | 1718 |
|
30244 | 1719 |
ObjectMonitor * freeHeadp = NULL; // Local SLL of scavenged monitors |
1720 |
ObjectMonitor * freeTailp = NULL; |
|
1 | 1721 |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1722 |
TEVENT(deflate_idle_monitors); |
5710 | 1723 |
// Prevent omFlush from changing mids in Thread dtor's during deflation |
1724 |
// And in case the vm thread is acquiring a lock during a safepoint |
|
1725 |
// See e.g. 6320749 |
|
30244 | 1726 |
Thread::muxAcquire(&gListLock, "scavenge - return"); |
5710 | 1727 |
|
1728 |
if (MonitorInUseLists) { |
|
46702 | 1729 |
// Note: the thread-local monitors lists get deflated in |
1730 |
// a separate pass. See deflate_thread_local_monitors(). |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1731 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1732 |
// For moribund threads, scan gOmInUseList |
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1733 |
if (gOmInUseList) { |
46702 | 1734 |
counters->nInCirculation += gOmInUseCount; |
30244 | 1735 |
int deflated_count = deflate_monitor_list((ObjectMonitor **)&gOmInUseList, &freeHeadp, &freeTailp); |
46702 | 1736 |
gOmInUseCount -= deflated_count; |
1737 |
counters->nScavenged += deflated_count; |
|
1738 |
counters->nInuse += gOmInUseCount; |
|
5920
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1739 |
} |
8fdbb85e62d3
6964164: MonitorInUseLists leak of contended objects
acorn
parents:
5712
diff
changeset
|
1740 |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1741 |
} else { |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
1742 |
PaddedEnd<ObjectMonitor> * block = OrderAccess::load_acquire(&gBlockList); |
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
1743 |
for (; block != NULL; block = next(block)) { |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1744 |
// Iterate over all extant monitors - Scavenge all idle monitors. |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1745 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
46702 | 1746 |
counters->nInCirculation += _BLOCKSIZE; |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1747 |
for (int i = 1; i < _BLOCKSIZE; i++) { |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1748 |
ObjectMonitor* mid = (ObjectMonitor*)&block[i]; |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1749 |
oop obj = (oop)mid->object(); |
1 | 1750 |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1751 |
if (obj == NULL) { |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1752 |
// The monitor is not associated with an object. |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1753 |
// The monitor should either be a thread-specific private |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1754 |
// free list or the global free list. |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1755 |
// obj == NULL IMPLIES mid->is_busy() == 0 |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1756 |
guarantee(!mid->is_busy(), "invariant"); |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1757 |
continue; |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1758 |
} |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1759 |
deflated = deflate_monitor(mid, obj, &freeHeadp, &freeTailp); |
5710 | 1760 |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1761 |
if (deflated) { |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1762 |
mid->FreeNext = NULL; |
46702 | 1763 |
counters->nScavenged++; |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1764 |
} else { |
46702 | 1765 |
counters->nInuse++; |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1766 |
} |
1 | 1767 |
} |
1768 |
} |
|
1769 |
} |
|
1770 |
||
1771 |
// Move the scavenged monitors back to the global free list. |
|
30244 | 1772 |
if (freeHeadp != NULL) { |
46702 | 1773 |
guarantee(freeTailp != NULL && counters->nScavenged > 0, "invariant"); |
30244 | 1774 |
assert(freeTailp->FreeNext == NULL, "invariant"); |
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1775 |
// constant-time list splice - prepend scavenged segment to gFreeList |
30244 | 1776 |
freeTailp->FreeNext = gFreeList; |
1777 |
gFreeList = freeHeadp; |
|
1 | 1778 |
} |
30244 | 1779 |
Thread::muxRelease(&gListLock); |
1 | 1780 |
|
46702 | 1781 |
} |
1782 |
||
1783 |
void ObjectSynchronizer::finish_deflate_idle_monitors(DeflateMonitorCounters* counters) { |
|
1784 |
gMonitorFreeCount += counters->nScavenged; |
|
1785 |
||
1786 |
// Consider: audit gFreeList to ensure that gMonitorFreeCount and list agree. |
|
1787 |
||
1788 |
if (ObjectMonitor::Knob_Verbose) { |
|
1789 |
tty->print_cr("INFO: Deflate: InCirc=%d InUse=%d Scavenged=%d " |
|
1790 |
"ForceMonitorScavenge=%d : pop=%d free=%d", |
|
1791 |
counters->nInCirculation, counters->nInuse, counters->nScavenged, ForceMonitorScavenge, |
|
1792 |
gMonitorPopulation, gMonitorFreeCount); |
|
1793 |
tty->flush(); |
|
1794 |
} |
|
1795 |
||
1796 |
ForceMonitorScavenge = 0; // Reset |
|
1797 |
||
1798 |
OM_PERFDATA_OP(Deflations, inc(counters->nScavenged)); |
|
1799 |
OM_PERFDATA_OP(MonExtant, set_value(counters->nInCirculation)); |
|
1 | 1800 |
|
1801 |
// TODO: Add objectMonitor leak detection. |
|
1802 |
// Audit/inventory the objectMonitors -- make sure they're all accounted for. |
|
25064
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1803 |
GVars.stwRandom = os::random(); |
244218e6ec0a
8046758: cleanup non-indent white space issues prior to Contended Locking cleanup bucket
dcubed
parents:
24424
diff
changeset
|
1804 |
GVars.stwCycle++; |
1 | 1805 |
} |
1806 |
||
46702 | 1807 |
void ObjectSynchronizer::deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters) { |
1808 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
1809 |
if (!MonitorInUseLists) return; |
|
1810 |
||
1811 |
ObjectMonitor * freeHeadp = NULL; // Local SLL of scavenged monitors |
|
1812 |
ObjectMonitor * freeTailp = NULL; |
|
1813 |
||
1814 |
int deflated_count = deflate_monitor_list(thread->omInUseList_addr(), &freeHeadp, &freeTailp); |
|
1815 |
||
1816 |
Thread::muxAcquire(&gListLock, "scavenge - return"); |
|
1817 |
||
1818 |
// Adjust counters |
|
1819 |
counters->nInCirculation += thread->omInUseCount; |
|
1820 |
thread->omInUseCount -= deflated_count; |
|
1821 |
if (ObjectMonitor::Knob_VerifyInUse) { |
|
1822 |
verifyInUse(thread); |
|
1823 |
} |
|
1824 |
counters->nScavenged += deflated_count; |
|
1825 |
counters->nInuse += thread->omInUseCount; |
|
1826 |
||
1827 |
// Move the scavenged monitors back to the global free list. |
|
1828 |
if (freeHeadp != NULL) { |
|
1829 |
guarantee(freeTailp != NULL && deflated_count > 0, "invariant"); |
|
1830 |
assert(freeTailp->FreeNext == NULL, "invariant"); |
|
1831 |
||
1832 |
// constant-time list splice - prepend scavenged segment to gFreeList |
|
1833 |
freeTailp->FreeNext = gFreeList; |
|
1834 |
gFreeList = freeHeadp; |
|
1835 |
} |
|
1836 |
Thread::muxRelease(&gListLock); |
|
1837 |
} |
|
1838 |
||
6975 | 1839 |
// Monitor cleanup on JavaThread::exit |
1 | 1840 |
|
6975 | 1841 |
// Iterate through monitor cache and attempt to release thread's monitors |
1842 |
// Gives up on a particular monitor if an exception occurs, but continues |
|
1843 |
// the overall iteration, swallowing the exception. |
|
1844 |
class ReleaseJavaMonitorsClosure: public MonitorClosure { |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1845 |
private: |
6975 | 1846 |
TRAPS; |
1 | 1847 |
|
26683
a02753d5a0b2
8057107: cleanup indent white space issues prior to Contended Locking reorder and cache line bucket
dcubed
parents:
25633
diff
changeset
|
1848 |
public: |
6975 | 1849 |
ReleaseJavaMonitorsClosure(Thread* thread) : THREAD(thread) {} |
1850 |
void do_monitor(ObjectMonitor* mid) { |
|
1851 |
if (mid->owner() == THREAD) { |
|
31782
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1852 |
if (ObjectMonitor::Knob_VerifyMatch != 0) { |
37251
9fc139ad74b5
8152358: code and comment cleanups found during the hunt for 8077392
dcubed
parents:
37250
diff
changeset
|
1853 |
ResourceMark rm; |
46271
979ebd346ecf
8169881: Remove implicit Handle conversions oop->Handle
coleenp
parents:
40664
diff
changeset
|
1854 |
Handle obj(THREAD, (oop) mid->object()); |
31782
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1855 |
tty->print("INFO: unexpected locked object:"); |
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1856 |
javaVFrame::print_locked_object_class_name(tty, obj, "locked"); |
33105
294e48b4f704
8080775: Better argument formatting for assert() and friends
david
parents:
32623
diff
changeset
|
1857 |
fatal("exiting JavaThread=" INTPTR_FORMAT |
294e48b4f704
8080775: Better argument formatting for assert() and friends
david
parents:
32623
diff
changeset
|
1858 |
" unexpectedly owns ObjectMonitor=" INTPTR_FORMAT, |
33148
68fa8b6c4340
8042893: compiler: PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC needs to be removed from source files
david
parents:
33105
diff
changeset
|
1859 |
p2i(THREAD), p2i(mid)); |
31782
b23b74f8ae8d
8130448: thread dump improvements, comment additions, new diagnostics inspired by 8077392
dcubed
parents:
31345
diff
changeset
|
1860 |
} |
6975 | 1861 |
(void)mid->complete_exit(CHECK); |
1 | 1862 |
} |
1863 |
} |
|
6975 | 1864 |
}; |
1 | 1865 |
|
6975 | 1866 |
// Release all inflated monitors owned by THREAD. Lightweight monitors are |
1867 |
// ignored. This is meant to be called during JNI thread detach which assumes |
|
1868 |
// all remaining monitors are heavyweight. All exceptions are swallowed. |
|
1869 |
// Scanning the extant monitor list can be time consuming. |
|
1870 |
// A simple optimization is to add a per-thread flag that indicates a thread |
|
1871 |
// called jni_monitorenter() during its lifetime. |
|
1 | 1872 |
// |
6975 | 1873 |
// Instead of No_Savepoint_Verifier it might be cheaper to |
1874 |
// use an idiom of the form: |
|
1875 |
// auto int tmp = SafepointSynchronize::_safepoint_counter ; |
|
1876 |
// <code that must not run at safepoint> |
|
1877 |
// guarantee (((tmp ^ _safepoint_counter) | (tmp & 1)) == 0) ; |
|
1878 |
// Since the tests are extremely cheap we could leave them enabled |
|
1879 |
// for normal product builds. |
|
1 | 1880 |
|
6975 | 1881 |
void ObjectSynchronizer::release_monitors_owned_by_thread(TRAPS) { |
1882 |
assert(THREAD == JavaThread::current(), "must be current Java thread"); |
|
35492
c8c0273e6b91
8146690: Make all classes in GC follow the naming convention.
david
parents:
35171
diff
changeset
|
1883 |
NoSafepointVerifier nsv; |
6975 | 1884 |
ReleaseJavaMonitorsClosure rjmc(THREAD); |
30244 | 1885 |
Thread::muxAcquire(&gListLock, "release_monitors_owned_by_thread"); |
6975 | 1886 |
ObjectSynchronizer::monitors_iterate(&rjmc); |
30244 | 1887 |
Thread::muxRelease(&gListLock); |
6975 | 1888 |
THREAD->clear_pending_exception(); |
1 | 1889 |
} |
1890 |
||
35934
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1891 |
const char* ObjectSynchronizer::inflate_cause_name(const InflateCause cause) { |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1892 |
switch (cause) { |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1893 |
case inflate_cause_vm_internal: return "VM Internal"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1894 |
case inflate_cause_monitor_enter: return "Monitor Enter"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1895 |
case inflate_cause_wait: return "Monitor Wait"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1896 |
case inflate_cause_notify: return "Monitor Notify"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1897 |
case inflate_cause_hash_code: return "Monitor Hash Code"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1898 |
case inflate_cause_jni_enter: return "JNI Monitor Enter"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1899 |
case inflate_cause_jni_exit: return "JNI Monitor Exit"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1900 |
default: |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1901 |
ShouldNotReachHere(); |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1902 |
} |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1903 |
return "Unknown"; |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1904 |
} |
76dbe86f3d82
8138562: Event based tracing should cover monitor inflation
dsimms
parents:
35492
diff
changeset
|
1905 |
|
1 | 1906 |
//------------------------------------------------------------------------------ |
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1907 |
// Debugging code |
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1908 |
|
51258 | 1909 |
u_char* ObjectSynchronizer::get_gvars_addr() { |
1910 |
return (u_char*)&GVars; |
|
1911 |
} |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1912 |
|
51258 | 1913 |
u_char* ObjectSynchronizer::get_gvars_hcSequence_addr() { |
1914 |
return (u_char*)&GVars.hcSequence; |
|
1915 |
} |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1916 |
|
51258 | 1917 |
size_t ObjectSynchronizer::get_gvars_size() { |
1918 |
return sizeof(SharedGlobals); |
|
1919 |
} |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1920 |
|
51258 | 1921 |
u_char* ObjectSynchronizer::get_gvars_stwRandom_addr() { |
1922 |
return (u_char*)&GVars.stwRandom; |
|
25633
4cd9c4622c8c
8049717: expose L1_data_cache_line_size for diagnostic/sanity checks
dcubed
parents:
25477
diff
changeset
|
1923 |
} |
1 | 1924 |
|
1925 |
#ifndef PRODUCT |
|
1926 |
||
1927 |
// Check if monitor belongs to the monitor cache |
|
1928 |
// The list is grow-only so it's *relatively* safe to traverse |
|
1929 |
// the list of extant blocks without taking a lock. |
|
1930 |
||
1931 |
int ObjectSynchronizer::verify_objmon_isinpool(ObjectMonitor *monitor) { |
|
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
1932 |
PaddedEnd<ObjectMonitor> * block = OrderAccess::load_acquire(&gBlockList); |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1933 |
while (block != NULL) { |
1 | 1934 |
assert(block->object() == CHAINMARKER, "must be a block header"); |
47634
6a0c42c40cd1
8188220: Remove Atomic::*_ptr() uses and overloads from hotspot
coleenp
parents:
47216
diff
changeset
|
1935 |
if (monitor > &block[0] && monitor < &block[_BLOCKSIZE]) { |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1936 |
address mon = (address)monitor; |
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1937 |
address blk = (address)block; |
1 | 1938 |
size_t diff = mon - blk; |
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1939 |
assert((diff % sizeof(PaddedEnd<ObjectMonitor>)) == 0, "must be aligned"); |
1 | 1940 |
return 1; |
1941 |
} |
|
33595
5830c3ae532d
8047212: runtime/ParallelClassLoading/bootstrap/random/inner-complex assert(ObjectSynchronizer::verify_objmon_isinpool(inf)) failed: monitor is invalid
dcubed
parents:
33148
diff
changeset
|
1942 |
block = (PaddedEnd<ObjectMonitor> *)block->FreeNext; |
1 | 1943 |
} |
1944 |
return 0; |
|
1945 |
} |
|
1946 |
||
1947 |
#endif |