author | rehn |
Fri, 29 Nov 2019 12:09:25 +0100 | |
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parent 58226 | 408c445d04e8 |
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/* |
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* Copyright (c) 2005, 2019, 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/classLoaderDataGraph.hpp" |
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#include "jfr/jfrEvents.hpp" |
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#include "jfr/support/jfrThreadId.hpp" |
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#include "logging/log.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/klass.inline.hpp" |
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#include "oops/markWord.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/atomic.hpp" |
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#include "runtime/basicLock.hpp" |
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#include "runtime/biasedLocking.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/task.hpp" |
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#include "runtime/threadSMR.hpp" |
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#include "runtime/vframe.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "runtime/vmOperations.hpp" |
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static bool _biased_locking_enabled = false; |
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BiasedLockingCounters BiasedLocking::_counters; |
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static GrowableArray<Handle>* _preserved_oop_stack = NULL; |
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static GrowableArray<markWord>* _preserved_mark_stack = NULL; |
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static void enable_biased_locking(InstanceKlass* k) { |
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k->set_prototype_header(markWord::biased_locking_prototype()); |
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} |
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static void enable_biased_locking() { |
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_biased_locking_enabled = true; |
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log_info(biasedlocking)("Biased locking enabled"); |
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} |
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class VM_EnableBiasedLocking: public VM_Operation { |
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public: |
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VM_EnableBiasedLocking() {} |
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VMOp_Type type() const { return VMOp_EnableBiasedLocking; } |
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void doit() { |
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// Iterate the class loader data dictionaries enabling biased locking for all |
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// currently loaded classes. |
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ClassLoaderDataGraph::dictionary_classes_do(enable_biased_locking); |
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// Indicate that future instances should enable it as well |
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enable_biased_locking(); |
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} |
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bool allow_nested_vm_operations() const { return false; } |
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}; |
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// One-shot PeriodicTask subclass for enabling biased locking |
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class EnableBiasedLockingTask : public PeriodicTask { |
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public: |
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EnableBiasedLockingTask(size_t interval_time) : PeriodicTask(interval_time) {} |
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virtual void task() { |
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VM_EnableBiasedLocking op; |
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VMThread::execute(&op); |
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// Reclaim our storage and disenroll ourself |
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delete this; |
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} |
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}; |
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void BiasedLocking::init() { |
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// If biased locking is enabled and BiasedLockingStartupDelay is set, |
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// schedule a task to fire after the specified delay which turns on |
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// biased locking for all currently loaded classes as well as future |
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// ones. This could be a workaround for startup time regressions |
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// due to large number of safepoints being taken during VM startup for |
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// bias revocation. |
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if (UseBiasedLocking) { |
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if (BiasedLockingStartupDelay > 0) { |
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EnableBiasedLockingTask* task = new EnableBiasedLockingTask(BiasedLockingStartupDelay); |
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task->enroll(); |
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} else { |
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enable_biased_locking(); |
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} |
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} |
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} |
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bool BiasedLocking::enabled() { |
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assert(UseBiasedLocking, "precondition"); |
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// We check "BiasedLockingStartupDelay == 0" here to cover the |
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// possibility of calls to BiasedLocking::enabled() before |
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// BiasedLocking::init(). |
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return _biased_locking_enabled || BiasedLockingStartupDelay == 0; |
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} |
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// Returns MonitorInfos for all objects locked on this thread in youngest to oldest order |
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static GrowableArray<MonitorInfo*>* get_or_compute_monitor_info(JavaThread* thread) { |
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GrowableArray<MonitorInfo*>* info = thread->cached_monitor_info(); |
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if (info != NULL) { |
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return info; |
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} |
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info = new GrowableArray<MonitorInfo*>(); |
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// It's possible for the thread to not have any Java frames on it, |
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// i.e., if it's the main thread and it's already returned from main() |
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if (thread->has_last_Java_frame()) { |
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RegisterMap rm(thread); |
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for (javaVFrame* vf = thread->last_java_vframe(&rm); vf != NULL; vf = vf->java_sender()) { |
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GrowableArray<MonitorInfo*> *monitors = vf->monitors(); |
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if (monitors != NULL) { |
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int len = monitors->length(); |
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// Walk monitors youngest to oldest |
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for (int i = len - 1; i >= 0; i--) { |
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MonitorInfo* mon_info = monitors->at(i); |
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if (mon_info->eliminated()) continue; |
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oop owner = mon_info->owner(); |
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if (owner != NULL) { |
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info->append(mon_info); |
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} |
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} |
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} |
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} |
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} |
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thread->set_cached_monitor_info(info); |
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return info; |
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} |
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// After the call, *biased_locker will be set to obj->mark()->biased_locker() if biased_locker != NULL, |
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// AND it is a living thread. Otherwise it will not be updated, (i.e. the caller is responsible for initialization). |
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void BiasedLocking::single_revoke_at_safepoint(oop obj, bool is_bulk, JavaThread* requesting_thread, JavaThread** biased_locker) { |
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assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); |
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assert(Thread::current()->is_VM_thread(), "must be VMThread"); |
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markWord mark = obj->mark(); |
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if (!mark.has_bias_pattern()) { |
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if (log_is_enabled(Info, biasedlocking)) { |
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ResourceMark rm; |
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log_info(biasedlocking)(" (Skipping revocation of object " INTPTR_FORMAT |
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", mark " INTPTR_FORMAT ", type %s" |
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", requesting thread " INTPTR_FORMAT |
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" because it's no longer biased)", |
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p2i((void *)obj), mark.value(), |
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obj->klass()->external_name(), |
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(intptr_t) requesting_thread); |
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} |
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return; |
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} |
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uint age = mark.age(); |
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markWord unbiased_prototype = markWord::prototype().set_age(age); |
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// Log at "info" level if not bulk, else "trace" level |
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if (!is_bulk) { |
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ResourceMark rm; |
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log_info(biasedlocking)("Revoking bias of object " INTPTR_FORMAT ", mark " |
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INTPTR_FORMAT ", type %s, prototype header " INTPTR_FORMAT |
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", requesting thread " INTPTR_FORMAT, |
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p2i((void *)obj), |
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mark.value(), |
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obj->klass()->external_name(), |
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obj->klass()->prototype_header().value(), |
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(intptr_t) requesting_thread); |
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} else { |
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ResourceMark rm; |
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log_trace(biasedlocking)("Revoking bias of object " INTPTR_FORMAT " , mark " |
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INTPTR_FORMAT " , type %s , prototype header " INTPTR_FORMAT |
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" , requesting thread " INTPTR_FORMAT, |
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p2i((void *)obj), |
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mark.value(), |
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obj->klass()->external_name(), |
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obj->klass()->prototype_header().value(), |
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(intptr_t) requesting_thread); |
1 | 199 |
} |
200 |
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JavaThread* biased_thread = mark.biased_locker(); |
1 | 202 |
if (biased_thread == NULL) { |
203 |
// Object is anonymously biased. We can get here if, for |
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204 |
// example, we revoke the bias due to an identity hash code |
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205 |
// being computed for an object. |
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|
206 |
obj->set_mark(unbiased_prototype); |
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207 |
|
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208 |
// Log at "info" level if not bulk, else "trace" level |
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209 |
if (!is_bulk) { |
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210 |
log_info(biasedlocking)(" Revoked bias of anonymously-biased object"); |
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211 |
} else { |
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212 |
log_trace(biasedlocking)(" Revoked bias of anonymously-biased object"); |
1 | 213 |
} |
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214 |
return; |
1 | 215 |
} |
216 |
||
217 |
// Handle case where the thread toward which the object was biased has exited |
|
218 |
bool thread_is_alive = false; |
|
219 |
if (requesting_thread == biased_thread) { |
|
220 |
thread_is_alive = true; |
|
221 |
} else { |
|
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222 |
ThreadsListHandle tlh; |
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223 |
thread_is_alive = tlh.includes(biased_thread); |
1 | 224 |
} |
225 |
if (!thread_is_alive) { |
|
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226 |
obj->set_mark(unbiased_prototype); |
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227 |
// Log at "info" level if not bulk, else "trace" level |
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228 |
if (!is_bulk) { |
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229 |
log_info(biasedlocking)(" Revoked bias of object biased toward dead thread (" |
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|
230 |
PTR_FORMAT ")", p2i(biased_thread)); |
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231 |
} else { |
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|
232 |
log_trace(biasedlocking)(" Revoked bias of object biased toward dead thread (" |
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233 |
PTR_FORMAT ")", p2i(biased_thread)); |
1 | 234 |
} |
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235 |
return; |
1 | 236 |
} |
237 |
||
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238 |
// Log at "info" level if not bulk, else "trace" level |
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|
239 |
if (!is_bulk) { |
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|
240 |
log_info(biasedlocking)(" Revoked bias of object biased toward live thread (" |
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|
241 |
PTR_FORMAT ")", p2i(biased_thread)); |
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|
242 |
} else { |
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|
243 |
log_trace(biasedlocking)(" Revoked bias of object biased toward live thread (" |
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|
244 |
PTR_FORMAT ")", p2i(biased_thread)); |
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|
245 |
} |
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246 |
|
1 | 247 |
// Thread owning bias is alive. |
248 |
// Check to see whether it currently owns the lock and, if so, |
|
249 |
// write down the needed displaced headers to the thread's stack. |
|
250 |
// Otherwise, restore the object's header either to the unlocked |
|
251 |
// or unbiased state. |
|
252 |
GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(biased_thread); |
|
253 |
BasicLock* highest_lock = NULL; |
|
254 |
for (int i = 0; i < cached_monitor_info->length(); i++) { |
|
255 |
MonitorInfo* mon_info = cached_monitor_info->at(i); |
|
58177 | 256 |
if (mon_info->owner() == obj) { |
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|
257 |
log_trace(biasedlocking)(" mon_info->owner (" PTR_FORMAT ") == obj (" PTR_FORMAT ")", |
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|
258 |
p2i((void *) mon_info->owner()), |
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|
259 |
p2i((void *) obj)); |
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|
260 |
// Assume recursive case and fix up highest lock below |
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|
261 |
markWord mark = markWord::encode((BasicLock*) NULL); |
1 | 262 |
highest_lock = mon_info->lock(); |
263 |
highest_lock->set_displaced_header(mark); |
|
264 |
} else { |
|
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|
265 |
log_trace(biasedlocking)(" mon_info->owner (" PTR_FORMAT ") != obj (" PTR_FORMAT ")", |
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|
266 |
p2i((void *) mon_info->owner()), |
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|
267 |
p2i((void *) obj)); |
1 | 268 |
} |
269 |
} |
|
270 |
if (highest_lock != NULL) { |
|
271 |
// Fix up highest lock to contain displaced header and point |
|
272 |
// object at it |
|
273 |
highest_lock->set_displaced_header(unbiased_prototype); |
|
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274 |
// Reset object header to point to displaced mark. |
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275 |
// Must release store the lock address for platforms without TSO |
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276 |
// ordering (e.g. ppc). |
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|
277 |
obj->release_set_mark(markWord::encode(highest_lock)); |
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|
278 |
assert(!obj->mark().has_bias_pattern(), "illegal mark state: stack lock used bias bit"); |
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|
279 |
// Log at "info" level if not bulk, else "trace" level |
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|
280 |
if (!is_bulk) { |
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|
281 |
log_info(biasedlocking)(" Revoked bias of currently-locked object"); |
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|
282 |
} else { |
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|
283 |
log_trace(biasedlocking)(" Revoked bias of currently-locked object"); |
1 | 284 |
} |
285 |
} else { |
|
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|
286 |
// Log at "info" level if not bulk, else "trace" level |
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|
287 |
if (!is_bulk) { |
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|
288 |
log_info(biasedlocking)(" Revoked bias of currently-unlocked object"); |
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|
289 |
} else { |
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|
290 |
log_trace(biasedlocking)(" Revoked bias of currently-unlocked object"); |
1 | 291 |
} |
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|
292 |
// Store the unlocked value into the object's header. |
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|
293 |
obj->set_mark(unbiased_prototype); |
1 | 294 |
} |
295 |
||
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|
296 |
// If requested, return information on which thread held the bias |
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|
297 |
if (biased_locker != NULL) { |
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|
298 |
*biased_locker = biased_thread; |
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|
299 |
} |
1 | 300 |
} |
301 |
||
302 |
||
303 |
enum HeuristicsResult { |
|
304 |
HR_NOT_BIASED = 1, |
|
305 |
HR_SINGLE_REVOKE = 2, |
|
306 |
HR_BULK_REBIAS = 3, |
|
307 |
HR_BULK_REVOKE = 4 |
|
308 |
}; |
|
309 |
||
310 |
||
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|
311 |
static HeuristicsResult update_heuristics(oop o) { |
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|
312 |
markWord mark = o->mark(); |
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|
313 |
if (!mark.has_bias_pattern()) { |
1 | 314 |
return HR_NOT_BIASED; |
315 |
} |
|
316 |
||
317 |
// Heuristics to attempt to throttle the number of revocations. |
|
318 |
// Stages: |
|
319 |
// 1. Revoke the biases of all objects in the heap of this type, |
|
320 |
// but allow rebiasing of those objects if unlocked. |
|
321 |
// 2. Revoke the biases of all objects in the heap of this type |
|
322 |
// and don't allow rebiasing of these objects. Disable |
|
323 |
// allocation of objects of that type with the bias bit set. |
|
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|
324 |
Klass* k = o->klass(); |
1 | 325 |
jlong cur_time = os::javaTimeMillis(); |
326 |
jlong last_bulk_revocation_time = k->last_biased_lock_bulk_revocation_time(); |
|
327 |
int revocation_count = k->biased_lock_revocation_count(); |
|
328 |
if ((revocation_count >= BiasedLockingBulkRebiasThreshold) && |
|
329 |
(revocation_count < BiasedLockingBulkRevokeThreshold) && |
|
330 |
(last_bulk_revocation_time != 0) && |
|
331 |
(cur_time - last_bulk_revocation_time >= BiasedLockingDecayTime)) { |
|
332 |
// This is the first revocation we've seen in a while of an |
|
333 |
// object of this type since the last time we performed a bulk |
|
334 |
// rebiasing operation. The application is allocating objects in |
|
335 |
// bulk which are biased toward a thread and then handing them |
|
336 |
// off to another thread. We can cope with this allocation |
|
337 |
// pattern via the bulk rebiasing mechanism so we reset the |
|
338 |
// klass's revocation count rather than allow it to increase |
|
339 |
// monotonically. If we see the need to perform another bulk |
|
340 |
// rebias operation later, we will, and if subsequently we see |
|
341 |
// many more revocation operations in a short period of time we |
|
342 |
// will completely disable biasing for this type. |
|
343 |
k->set_biased_lock_revocation_count(0); |
|
344 |
revocation_count = 0; |
|
345 |
} |
|
346 |
||
347 |
// Make revocation count saturate just beyond BiasedLockingBulkRevokeThreshold |
|
348 |
if (revocation_count <= BiasedLockingBulkRevokeThreshold) { |
|
349 |
revocation_count = k->atomic_incr_biased_lock_revocation_count(); |
|
350 |
} |
|
351 |
||
352 |
if (revocation_count == BiasedLockingBulkRevokeThreshold) { |
|
353 |
return HR_BULK_REVOKE; |
|
354 |
} |
|
355 |
||
356 |
if (revocation_count == BiasedLockingBulkRebiasThreshold) { |
|
357 |
return HR_BULK_REBIAS; |
|
358 |
} |
|
359 |
||
360 |
return HR_SINGLE_REVOKE; |
|
361 |
} |
|
362 |
||
363 |
||
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|
364 |
void BiasedLocking::bulk_revoke_at_safepoint(oop o, bool bulk_rebias, JavaThread* requesting_thread) { |
1 | 365 |
assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); |
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|
366 |
assert(Thread::current()->is_VM_thread(), "must be VMThread"); |
1 | 367 |
|
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|
368 |
log_info(biasedlocking)("* Beginning bulk revocation (kind == %s) because of object " |
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|
369 |
INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s", |
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|
370 |
(bulk_rebias ? "rebias" : "revoke"), |
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|
371 |
p2i((void *) o), |
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|
372 |
o->mark().value(), |
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|
373 |
o->klass()->external_name()); |
1 | 374 |
|
375 |
jlong cur_time = os::javaTimeMillis(); |
|
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|
376 |
o->klass()->set_last_biased_lock_bulk_revocation_time(cur_time); |
1 | 377 |
|
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|
378 |
Klass* k_o = o->klass(); |
14488 | 379 |
Klass* klass = k_o; |
1 | 380 |
|
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|
381 |
{ |
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|
382 |
JavaThreadIteratorWithHandle jtiwh; |
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changeset
|
383 |
|
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changeset
|
384 |
if (bulk_rebias) { |
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changeset
|
385 |
// Use the epoch in the klass of the object to implicitly revoke |
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changeset
|
386 |
// all biases of objects of this data type and force them to be |
8d15b1369c7a
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changeset
|
387 |
// reacquired. However, we also need to walk the stacks of all |
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changeset
|
388 |
// threads and update the headers of lightweight locked objects |
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|
389 |
// with biases to have the current epoch. |
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|
390 |
|
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changeset
|
391 |
// If the prototype header doesn't have the bias pattern, don't |
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changeset
|
392 |
// try to update the epoch -- assume another VM operation came in |
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changeset
|
393 |
// and reset the header to the unbiased state, which will |
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changeset
|
394 |
// implicitly cause all existing biases to be revoked |
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changeset
|
395 |
if (klass->prototype_header().has_bias_pattern()) { |
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changeset
|
396 |
int prev_epoch = klass->prototype_header().bias_epoch(); |
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changeset
|
397 |
klass->set_prototype_header(klass->prototype_header().incr_bias_epoch()); |
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398 |
int cur_epoch = klass->prototype_header().bias_epoch(); |
1 | 399 |
|
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|
400 |
// Now walk all threads' stacks and adjust epochs of any biased |
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|
401 |
// and locked objects of this data type we encounter |
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|
402 |
for (; JavaThread *thr = jtiwh.next(); ) { |
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|
403 |
GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(thr); |
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|
404 |
for (int i = 0; i < cached_monitor_info->length(); i++) { |
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|
405 |
MonitorInfo* mon_info = cached_monitor_info->at(i); |
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|
406 |
oop owner = mon_info->owner(); |
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|
407 |
markWord mark = owner->mark(); |
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|
408 |
if ((owner->klass() == k_o) && mark.has_bias_pattern()) { |
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|
409 |
// We might have encountered this object already in the case of recursive locking |
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|
410 |
assert(mark.bias_epoch() == prev_epoch || mark.bias_epoch() == cur_epoch, "error in bias epoch adjustment"); |
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|
411 |
owner->set_mark(mark.set_bias_epoch(cur_epoch)); |
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|
412 |
} |
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|
413 |
} |
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|
414 |
} |
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|
415 |
} |
1 | 416 |
|
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|
417 |
// At this point we're done. All we have to do is potentially |
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|
418 |
// adjust the header of the given object to revoke its bias. |
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|
419 |
single_revoke_at_safepoint(o, true, requesting_thread, NULL); |
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|
420 |
} else { |
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|
421 |
if (log_is_enabled(Info, biasedlocking)) { |
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|
422 |
ResourceMark rm; |
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|
423 |
log_info(biasedlocking)("* Disabling biased locking for type %s", klass->external_name()); |
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|
424 |
} |
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changeset
|
425 |
|
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changeset
|
426 |
// Disable biased locking for this data type. Not only will this |
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changeset
|
427 |
// cause future instances to not be biased, but existing biased |
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|
428 |
// instances will notice that this implicitly caused their biases |
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|
429 |
// to be revoked. |
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|
430 |
klass->set_prototype_header(markWord::prototype()); |
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|
431 |
|
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|
432 |
// Now walk all threads' stacks and forcibly revoke the biases of |
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|
433 |
// any locked and biased objects of this data type we encounter. |
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changeset
|
434 |
for (; JavaThread *thr = jtiwh.next(); ) { |
1 | 435 |
GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(thr); |
436 |
for (int i = 0; i < cached_monitor_info->length(); i++) { |
|
437 |
MonitorInfo* mon_info = cached_monitor_info->at(i); |
|
438 |
oop owner = mon_info->owner(); |
|
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|
439 |
markWord mark = owner->mark(); |
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|
440 |
if ((owner->klass() == k_o) && mark.has_bias_pattern()) { |
57893
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changeset
|
441 |
single_revoke_at_safepoint(owner, true, requesting_thread, NULL); |
1 | 442 |
} |
443 |
} |
|
444 |
} |
|
445 |
||
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|
446 |
// Must force the bias of the passed object to be forcibly revoked |
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|
447 |
// as well to ensure guarantees to callers |
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|
448 |
single_revoke_at_safepoint(o, true, requesting_thread, NULL); |
1 | 449 |
} |
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|
450 |
} // ThreadsListHandle is destroyed here. |
1 | 451 |
|
36186
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|
452 |
log_info(biasedlocking)("* Ending bulk revocation"); |
1 | 453 |
|
57893
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changeset
|
454 |
assert(!o->mark().has_bias_pattern(), "bug in bulk bias revocation"); |
1 | 455 |
} |
456 |
||
457 |
||
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|
458 |
static void clean_up_cached_monitor_info(JavaThread* thread = NULL) { |
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changeset
|
459 |
if (thread != NULL) { |
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|
460 |
thread->set_cached_monitor_info(NULL); |
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|
461 |
} else { |
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|
462 |
// Walk the thread list clearing out the cached monitors |
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|
463 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thr = jtiwh.next(); ) { |
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|
464 |
thr->set_cached_monitor_info(NULL); |
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changeset
|
465 |
} |
1 | 466 |
} |
467 |
} |
|
468 |
||
469 |
||
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|
470 |
class VM_BulkRevokeBias : public VM_Operation { |
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|
471 |
private: |
1 | 472 |
Handle* _obj; |
473 |
JavaThread* _requesting_thread; |
|
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|
474 |
bool _bulk_rebias; |
54710
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|
475 |
uint64_t _safepoint_id; |
1 | 476 |
|
477 |
public: |
|
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changeset
|
478 |
VM_BulkRevokeBias(Handle* obj, JavaThread* requesting_thread, |
57893
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|
479 |
bool bulk_rebias) |
1 | 480 |
: _obj(obj) |
481 |
, _requesting_thread(requesting_thread) |
|
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|
482 |
, _bulk_rebias(bulk_rebias) |
54710
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|
483 |
, _safepoint_id(0) {} |
1 | 484 |
|
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|
485 |
virtual VMOp_Type type() const { return VMOp_BulkRevokeBias; } |
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|
486 |
|
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changeset
|
487 |
virtual void doit() { |
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changeset
|
488 |
BiasedLocking::bulk_revoke_at_safepoint((*_obj)(), _bulk_rebias, _requesting_thread); |
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|
489 |
_safepoint_id = SafepointSynchronize::safepoint_id(); |
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changeset
|
490 |
clean_up_cached_monitor_info(); |
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changeset
|
491 |
} |
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changeset
|
492 |
|
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changeset
|
493 |
bool is_bulk_rebias() const { |
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changeset
|
494 |
return _bulk_rebias; |
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changeset
|
495 |
} |
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changeset
|
496 |
|
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changeset
|
497 |
uint64_t safepoint_id() const { |
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changeset
|
498 |
return _safepoint_id; |
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changeset
|
499 |
} |
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changeset
|
500 |
}; |
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changeset
|
501 |
|
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changeset
|
502 |
|
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changeset
|
503 |
class RevokeOneBias : public ThreadClosure { |
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changeset
|
504 |
protected: |
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changeset
|
505 |
Handle _obj; |
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changeset
|
506 |
JavaThread* _requesting_thread; |
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changeset
|
507 |
JavaThread* _biased_locker; |
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changeset
|
508 |
BiasedLocking::Condition _status_code; |
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changeset
|
509 |
traceid _biased_locker_id; |
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changeset
|
510 |
|
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changeset
|
511 |
public: |
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changeset
|
512 |
RevokeOneBias(Handle obj, JavaThread* requesting_thread, JavaThread* biased_locker) |
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changeset
|
513 |
: _obj(obj) |
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changeset
|
514 |
, _requesting_thread(requesting_thread) |
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changeset
|
515 |
, _biased_locker(biased_locker) |
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changeset
|
516 |
, _status_code(BiasedLocking::NOT_BIASED) |
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changeset
|
517 |
, _biased_locker_id(0) {} |
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changeset
|
518 |
|
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changeset
|
519 |
void do_thread(Thread* target) { |
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diff
changeset
|
520 |
assert(target == _biased_locker, "Wrong thread"); |
1 | 521 |
|
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changeset
|
522 |
oop o = _obj(); |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
523 |
markWord mark = o->mark(); |
55625
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diff
changeset
|
524 |
|
57777
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changeset
|
525 |
if (!mark.has_bias_pattern()) { |
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changeset
|
526 |
return; |
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changeset
|
527 |
} |
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changeset
|
528 |
|
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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changeset
|
529 |
markWord prototype = o->klass()->prototype_header(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
530 |
if (!prototype.has_bias_pattern()) { |
55625
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diff
changeset
|
531 |
// This object has a stale bias from before the handshake |
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changeset
|
532 |
// was requested. If we fail this race, the object's bias |
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|
533 |
// has been revoked by another thread so we simply return. |
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changeset
|
534 |
markWord biased_value = mark; |
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|
535 |
mark = o->cas_set_mark(markWord::prototype().set_age(mark.age()), mark); |
90ead0febf56
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changeset
|
536 |
assert(!o->mark().has_bias_pattern(), "even if we raced, should still be revoked"); |
55625
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diff
changeset
|
537 |
if (biased_value == mark) { |
f7e8dbb77156
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changeset
|
538 |
_status_code = BiasedLocking::BIAS_REVOKED; |
1 | 539 |
} |
55625
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changeset
|
540 |
return; |
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diff
changeset
|
541 |
} |
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diff
changeset
|
542 |
|
57777
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changeset
|
543 |
if (_biased_locker == mark.biased_locker()) { |
90ead0febf56
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stefank
parents:
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changeset
|
544 |
if (mark.bias_epoch() == prototype.bias_epoch()) { |
55625
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diff
changeset
|
545 |
// Epoch is still valid. This means biaser could be currently |
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8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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diff
changeset
|
546 |
// synchronized on this object. We must walk its stack looking |
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diff
changeset
|
547 |
// for monitor records associated with this object and change |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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changeset
|
548 |
// them to be stack locks if any are found. |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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diff
changeset
|
549 |
ResourceMark rm; |
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8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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changeset
|
550 |
BiasedLocking::walk_stack_and_revoke(o, _biased_locker); |
f7e8dbb77156
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changeset
|
551 |
_biased_locker->set_cached_monitor_info(NULL); |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
552 |
assert(!o->mark().has_bias_pattern(), "invariant"); |
55625
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diff
changeset
|
553 |
_biased_locker_id = JFR_THREAD_ID(_biased_locker); |
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8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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diff
changeset
|
554 |
_status_code = BiasedLocking::BIAS_REVOKED; |
f7e8dbb77156
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diff
changeset
|
555 |
return; |
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parents:
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diff
changeset
|
556 |
} else { |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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parents:
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diff
changeset
|
557 |
markWord biased_value = mark; |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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changeset
|
558 |
mark = o->cas_set_mark(markWord::prototype().set_age(mark.age()), mark); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
559 |
if (mark == biased_value || !mark.has_bias_pattern()) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
560 |
assert(!o->mark().has_bias_pattern(), "should be revoked"); |
55625
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diff
changeset
|
561 |
_status_code = (biased_value == mark) ? BiasedLocking::BIAS_REVOKED : BiasedLocking::NOT_BIASED; |
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changeset
|
562 |
return; |
1 | 563 |
} |
564 |
} |
|
565 |
} |
|
566 |
||
55625
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diff
changeset
|
567 |
_status_code = BiasedLocking::NOT_REVOKED; |
1 | 568 |
} |
569 |
||
570 |
BiasedLocking::Condition status_code() const { |
|
571 |
return _status_code; |
|
572 |
} |
|
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
573 |
|
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
574 |
traceid biased_locker() const { |
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
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changeset
|
575 |
return _biased_locker_id; |
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
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diff
changeset
|
576 |
} |
1 | 577 |
}; |
578 |
||
579 |
||
50113 | 580 |
static void post_self_revocation_event(EventBiasedLockSelfRevocation* event, Klass* k) { |
581 |
assert(event != NULL, "invariant"); |
|
582 |
assert(k != NULL, "invariant"); |
|
583 |
assert(event->should_commit(), "invariant"); |
|
584 |
event->set_lockClass(k); |
|
585 |
event->commit(); |
|
586 |
} |
|
587 |
||
55625
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parents:
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diff
changeset
|
588 |
static void post_revocation_event(EventBiasedLockRevocation* event, Klass* k, RevokeOneBias* op) { |
50113 | 589 |
assert(event != NULL, "invariant"); |
590 |
assert(k != NULL, "invariant"); |
|
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
591 |
assert(op != NULL, "invariant"); |
50113 | 592 |
assert(event->should_commit(), "invariant"); |
593 |
event->set_lockClass(k); |
|
55625
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diff
changeset
|
594 |
event->set_safepointId(0); |
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
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diff
changeset
|
595 |
event->set_previousOwner(op->biased_locker()); |
50113 | 596 |
event->commit(); |
597 |
} |
|
598 |
||
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
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diff
changeset
|
599 |
static void post_class_revocation_event(EventBiasedLockClassRevocation* event, Klass* k, VM_BulkRevokeBias* op) { |
50113 | 600 |
assert(event != NULL, "invariant"); |
601 |
assert(k != NULL, "invariant"); |
|
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
602 |
assert(op != NULL, "invariant"); |
50113 | 603 |
assert(event->should_commit(), "invariant"); |
604 |
event->set_revokedClass(k); |
|
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
605 |
event->set_disableBiasing(!op->is_bulk_rebias()); |
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
606 |
event->set_safepointId(op->safepoint_id()); |
50113 | 607 |
event->commit(); |
608 |
} |
|
1 | 609 |
|
55625
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parents:
55537
diff
changeset
|
610 |
|
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
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diff
changeset
|
611 |
BiasedLocking::Condition BiasedLocking::single_revoke_with_handshake(Handle obj, JavaThread *requester, JavaThread *biaser) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
612 |
|
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
613 |
EventBiasedLockRevocation event; |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
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diff
changeset
|
614 |
if (PrintBiasedLockingStatistics) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
615 |
Atomic::inc(handshakes_count_addr()); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
616 |
} |
f7e8dbb77156
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pchilanomate
parents:
55537
diff
changeset
|
617 |
log_info(biasedlocking, handshake)("JavaThread " INTPTR_FORMAT " handshaking JavaThread " |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
618 |
INTPTR_FORMAT " to revoke object " INTPTR_FORMAT, p2i(requester), |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
619 |
p2i(biaser), p2i(obj())); |
1 | 620 |
|
55625
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parents:
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diff
changeset
|
621 |
RevokeOneBias revoke(obj, requester, biaser); |
f7e8dbb77156
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parents:
55537
diff
changeset
|
622 |
bool executed = Handshake::execute(&revoke, biaser); |
f7e8dbb77156
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parents:
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diff
changeset
|
623 |
if (revoke.status_code() == NOT_REVOKED) { |
f7e8dbb77156
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diff
changeset
|
624 |
return NOT_REVOKED; |
f7e8dbb77156
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parents:
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diff
changeset
|
625 |
} |
f7e8dbb77156
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parents:
55537
diff
changeset
|
626 |
if (executed) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
627 |
log_info(biasedlocking, handshake)("Handshake revocation for object " INTPTR_FORMAT " succeeded. Bias was %srevoked", |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
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diff
changeset
|
628 |
p2i(obj()), (revoke.status_code() == BIAS_REVOKED ? "" : "already ")); |
f7e8dbb77156
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pchilanomate
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diff
changeset
|
629 |
if (event.should_commit() && revoke.status_code() == BIAS_REVOKED) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
630 |
post_revocation_event(&event, obj->klass(), &revoke); |
1 | 631 |
} |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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parents:
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diff
changeset
|
632 |
assert(!obj->mark().has_bias_pattern(), "invariant"); |
55625
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diff
changeset
|
633 |
return revoke.status_code(); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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diff
changeset
|
634 |
} else { |
f7e8dbb77156
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parents:
55537
diff
changeset
|
635 |
// Thread was not alive. |
f7e8dbb77156
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pchilanomate
parents:
55537
diff
changeset
|
636 |
// Grab Threads_lock before manually trying to revoke bias. This avoids race with a newly |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
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diff
changeset
|
637 |
// created JavaThread (that happens to get the same memory address as biaser) synchronizing |
f7e8dbb77156
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parents:
55537
diff
changeset
|
638 |
// on this object. |
f7e8dbb77156
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parents:
55537
diff
changeset
|
639 |
{ |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
55537
diff
changeset
|
640 |
MutexLocker ml(Threads_lock); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
641 |
markWord mark = obj->mark(); |
55625
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8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
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diff
changeset
|
642 |
// Check if somebody else was able to revoke it before biased thread exited. |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
643 |
if (!mark.has_bias_pattern()) { |
55625
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55537
diff
changeset
|
644 |
return NOT_BIASED; |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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diff
changeset
|
645 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
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diff
changeset
|
646 |
ThreadsListHandle tlh; |
57777
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8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
647 |
markWord prototype = obj->klass()->prototype_header(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
648 |
if (!prototype.has_bias_pattern() || (!tlh.includes(biaser) && biaser == mark.biased_locker() && |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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parents:
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diff
changeset
|
649 |
prototype.bias_epoch() == mark.bias_epoch())) { |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
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diff
changeset
|
650 |
obj->cas_set_mark(markWord::prototype().set_age(mark.age()), mark); |
55625
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55537
diff
changeset
|
651 |
if (event.should_commit()) { |
f7e8dbb77156
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55537
diff
changeset
|
652 |
post_revocation_event(&event, obj->klass(), &revoke); |
1 | 653 |
} |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
654 |
assert(!obj->mark().has_bias_pattern(), "bias should be revoked by now"); |
55625
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diff
changeset
|
655 |
return BIAS_REVOKED; |
1 | 656 |
} |
657 |
} |
|
658 |
} |
|
659 |
||
55625
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diff
changeset
|
660 |
return NOT_REVOKED; |
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parents:
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diff
changeset
|
661 |
} |
f7e8dbb77156
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parents:
55537
diff
changeset
|
662 |
|
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
663 |
|
f7e8dbb77156
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pchilanomate
parents:
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diff
changeset
|
664 |
// Caller should have instantiated a ResourceMark object before calling this method |
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pchilanomate
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diff
changeset
|
665 |
void BiasedLocking::walk_stack_and_revoke(oop obj, JavaThread* biased_locker) { |
f7e8dbb77156
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diff
changeset
|
666 |
assert(!SafepointSynchronize::is_at_safepoint() || !ThreadLocalHandshakes, |
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diff
changeset
|
667 |
"if ThreadLocalHandshakes is enabled this should always be executed outside safepoints"); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
668 |
assert(Thread::current() == biased_locker || Thread::current()->is_VM_thread(), "wrong thread"); |
f7e8dbb77156
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pchilanomate
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diff
changeset
|
669 |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
670 |
markWord mark = obj->mark(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
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diff
changeset
|
671 |
assert(mark.biased_locker() == biased_locker && |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
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diff
changeset
|
672 |
obj->klass()->prototype_header().bias_epoch() == mark.bias_epoch(), "invariant"); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
673 |
|
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
674 |
log_trace(biasedlocking)("%s(" INTPTR_FORMAT ") revoking object " INTPTR_FORMAT ", mark " |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
675 |
INTPTR_FORMAT ", type %s, prototype header " INTPTR_FORMAT |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
676 |
", biaser " INTPTR_FORMAT " %s", |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
677 |
Thread::current()->is_VM_thread() ? "VMThread" : "JavaThread", |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
678 |
p2i(Thread::current()), |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
679 |
p2i(obj), |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
680 |
mark.value(), |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
681 |
obj->klass()->external_name(), |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
682 |
obj->klass()->prototype_header().value(), |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
683 |
p2i(biased_locker), |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
684 |
Thread::current()->is_VM_thread() ? "" : "(walking own stack)"); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
685 |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
686 |
markWord unbiased_prototype = markWord::prototype().set_age(obj->mark().age()); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
687 |
|
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
688 |
GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(biased_locker); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
689 |
BasicLock* highest_lock = NULL; |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
690 |
for (int i = 0; i < cached_monitor_info->length(); i++) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
691 |
MonitorInfo* mon_info = cached_monitor_info->at(i); |
58177 | 692 |
if (mon_info->owner() == obj) { |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
693 |
log_trace(biasedlocking)(" mon_info->owner (" PTR_FORMAT ") == obj (" PTR_FORMAT ")", |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
694 |
p2i(mon_info->owner()), |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
695 |
p2i(obj)); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
696 |
// Assume recursive case and fix up highest lock below |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
697 |
markWord mark = markWord::encode((BasicLock*) NULL); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
698 |
highest_lock = mon_info->lock(); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
699 |
highest_lock->set_displaced_header(mark); |
1 | 700 |
} else { |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
701 |
log_trace(biasedlocking)(" mon_info->owner (" PTR_FORMAT ") != obj (" PTR_FORMAT ")", |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
702 |
p2i(mon_info->owner()), |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
703 |
p2i(obj)); |
1 | 704 |
} |
705 |
} |
|
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
706 |
if (highest_lock != NULL) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
707 |
// Fix up highest lock to contain displaced header and point |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
708 |
// object at it |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
709 |
highest_lock->set_displaced_header(unbiased_prototype); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
710 |
// Reset object header to point to displaced mark. |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
711 |
// Must release store the lock address for platforms without TSO |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
712 |
// ordering (e.g. ppc). |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
713 |
obj->release_set_mark(markWord::encode(highest_lock)); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
714 |
assert(!obj->mark().has_bias_pattern(), "illegal mark state: stack lock used bias bit"); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
715 |
log_info(biasedlocking)(" Revoked bias of currently-locked object"); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
716 |
} else { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
717 |
log_info(biasedlocking)(" Revoked bias of currently-unlocked object"); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
718 |
// Store the unlocked value into the object's header. |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
719 |
obj->set_mark(unbiased_prototype); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
720 |
} |
1 | 721 |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
722 |
assert(!obj->mark().has_bias_pattern(), "must not be biased"); |
1 | 723 |
} |
724 |
||
58226 | 725 |
void BiasedLocking::revoke_own_lock(Handle obj, TRAPS) { |
726 |
assert(THREAD->is_Java_thread(), "must be called by a JavaThread"); |
|
727 |
JavaThread* thread = (JavaThread*)THREAD; |
|
728 |
||
729 |
markWord mark = obj->mark(); |
|
730 |
||
731 |
if (!mark.has_bias_pattern()) { |
|
732 |
return; |
|
733 |
} |
|
734 |
||
735 |
Klass *k = obj->klass(); |
|
736 |
assert(mark.biased_locker() == thread && |
|
737 |
k->prototype_header().bias_epoch() == mark.bias_epoch(), "Revoke failed, unhandled biased lock state"); |
|
738 |
ResourceMark rm; |
|
739 |
log_info(biasedlocking)("Revoking bias by walking my own stack:"); |
|
740 |
EventBiasedLockSelfRevocation event; |
|
741 |
BiasedLocking::walk_stack_and_revoke(obj(), (JavaThread*) thread); |
|
742 |
thread->set_cached_monitor_info(NULL); |
|
743 |
assert(!obj->mark().has_bias_pattern(), "invariant"); |
|
744 |
if (event.should_commit()) { |
|
745 |
post_self_revocation_event(&event, k); |
|
746 |
} |
|
747 |
} |
|
1 | 748 |
|
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
749 |
void BiasedLocking::revoke(Handle obj, TRAPS) { |
1 | 750 |
assert(!SafepointSynchronize::is_at_safepoint(), "must not be called while at safepoint"); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
751 |
|
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
752 |
while (true) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
753 |
// We can revoke the biases of anonymously-biased objects |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
754 |
// efficiently enough that we should not cause these revocations to |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
755 |
// update the heuristics because doing so may cause unwanted bulk |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
756 |
// revocations (which are expensive) to occur. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
757 |
markWord mark = obj->mark(); |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
758 |
|
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
759 |
if (!mark.has_bias_pattern()) { |
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
760 |
return; |
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
761 |
} |
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
762 |
|
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
763 |
if (mark.is_biased_anonymously()) { |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
764 |
// We are probably trying to revoke the bias of this object due to |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
765 |
// an identity hash code computation. Try to revoke the bias |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
766 |
// without a safepoint. This is possible if we can successfully |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
767 |
// compare-and-exchange an unbiased header into the mark word of |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
768 |
// the object, meaning that no other thread has raced to acquire |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
769 |
// the bias of the object. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
770 |
markWord biased_value = mark; |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
771 |
markWord unbiased_prototype = markWord::prototype().set_age(mark.age()); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
772 |
markWord res_mark = obj->cas_set_mark(unbiased_prototype, mark); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
773 |
if (res_mark == biased_value) { |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
774 |
return; |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
775 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
776 |
mark = res_mark; // Refresh mark with the latest value. |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
777 |
} else { |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
778 |
Klass* k = obj->klass(); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
779 |
markWord prototype_header = k->prototype_header(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
780 |
if (!prototype_header.has_bias_pattern()) { |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
781 |
// This object has a stale bias from before the bulk revocation |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
782 |
// for this data type occurred. It's pointless to update the |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
783 |
// heuristics at this point so simply update the header with a |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
784 |
// CAS. If we fail this race, the object's bias has been revoked |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
785 |
// by another thread so we simply return and let the caller deal |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
786 |
// with it. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
787 |
obj->cas_set_mark(prototype_header.set_age(mark.age()), mark); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
788 |
assert(!obj->mark().has_bias_pattern(), "even if we raced, should still be revoked"); |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
789 |
return; |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
790 |
} else if (prototype_header.bias_epoch() != mark.bias_epoch()) { |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
791 |
// The epoch of this biasing has expired indicating that the |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
792 |
// object is effectively unbiased. We can revoke the bias of this |
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
793 |
// object efficiently enough with a CAS that we shouldn't update the |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
794 |
// heuristics. This is normally done in the assembly code but we |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
795 |
// can reach this point due to various points in the runtime |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
796 |
// needing to revoke biases. |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
797 |
markWord res_mark; |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
798 |
markWord biased_value = mark; |
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
799 |
markWord unbiased_prototype = markWord::prototype().set_age(mark.age()); |
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
800 |
res_mark = obj->cas_set_mark(unbiased_prototype, mark); |
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
801 |
if (res_mark == biased_value) { |
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
802 |
return; |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
803 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
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diff
changeset
|
804 |
mark = res_mark; // Refresh mark with the latest value. |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
55537
diff
changeset
|
805 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
806 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
807 |
|
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
808 |
HeuristicsResult heuristics = update_heuristics(obj()); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
809 |
if (heuristics == HR_NOT_BIASED) { |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
810 |
return; |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
811 |
} else if (heuristics == HR_SINGLE_REVOKE) { |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
812 |
JavaThread *blt = mark.biased_locker(); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
813 |
assert(blt != NULL, "invariant"); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
814 |
if (blt == THREAD) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
815 |
// A thread is trying to revoke the bias of an object biased |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
816 |
// toward it, again likely due to an identity hash code |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
817 |
// computation. We can again avoid a safepoint/handshake in this case |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
818 |
// since we are only going to walk our own stack. There are no |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
819 |
// races with revocations occurring in other threads because we |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
820 |
// reach no safepoints in the revocation path. |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
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diff
changeset
|
821 |
EventBiasedLockSelfRevocation event; |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
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diff
changeset
|
822 |
ResourceMark rm; |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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diff
changeset
|
823 |
walk_stack_and_revoke(obj(), blt); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
824 |
blt->set_cached_monitor_info(NULL); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
825 |
assert(!obj->mark().has_bias_pattern(), "invariant"); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
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diff
changeset
|
826 |
if (event.should_commit()) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
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diff
changeset
|
827 |
post_self_revocation_event(&event, obj->klass()); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
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diff
changeset
|
828 |
} |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
829 |
return; |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
830 |
} else { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
55537
diff
changeset
|
831 |
BiasedLocking::Condition cond = single_revoke_with_handshake(obj, (JavaThread*)THREAD, blt); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
832 |
if (cond != NOT_REVOKED) { |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
833 |
return; |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
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parents:
55537
diff
changeset
|
834 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
835 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
836 |
} else { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
837 |
assert((heuristics == HR_BULK_REVOKE) || |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
838 |
(heuristics == HR_BULK_REBIAS), "?"); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
839 |
EventBiasedLockClassRevocation event; |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
840 |
VM_BulkRevokeBias bulk_revoke(&obj, (JavaThread*)THREAD, |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
841 |
(heuristics == HR_BULK_REBIAS)); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
842 |
VMThread::execute(&bulk_revoke); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
843 |
if (event.should_commit()) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
844 |
post_class_revocation_event(&event, obj->klass(), &bulk_revoke); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
845 |
} |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
846 |
return; |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
847 |
} |
1 | 848 |
} |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
849 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
850 |
|
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
851 |
// All objects in objs should be locked by biaser |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
852 |
void BiasedLocking::revoke(GrowableArray<Handle>* objs, JavaThread *biaser) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
853 |
bool clean_my_cache = false; |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
854 |
for (int i = 0; i < objs->length(); i++) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
855 |
oop obj = (objs->at(i))(); |
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
856 |
markWord mark = obj->mark(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
857 |
if (mark.has_bias_pattern()) { |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
858 |
walk_stack_and_revoke(obj, biaser); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
859 |
clean_my_cache = true; |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
860 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
861 |
} |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
862 |
if (clean_my_cache) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
863 |
clean_up_cached_monitor_info(biaser); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
864 |
} |
1 | 865 |
} |
866 |
||
867 |
||
868 |
void BiasedLocking::revoke_at_safepoint(Handle h_obj) { |
|
869 |
assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint"); |
|
870 |
oop obj = h_obj(); |
|
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
871 |
HeuristicsResult heuristics = update_heuristics(obj); |
1 | 872 |
if (heuristics == HR_SINGLE_REVOKE) { |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
873 |
JavaThread* biased_locker = NULL; |
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
874 |
single_revoke_at_safepoint(obj, false, NULL, &biased_locker); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
875 |
if (biased_locker) { |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
876 |
clean_up_cached_monitor_info(biased_locker); |
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
877 |
} |
1 | 878 |
} else if ((heuristics == HR_BULK_REBIAS) || |
879 |
(heuristics == HR_BULK_REVOKE)) { |
|
57893
49fea19f0726
8229844: Remove attempt_rebias parameter from revoke_and_rebias()
pchilanomate
parents:
57811
diff
changeset
|
880 |
bulk_revoke_at_safepoint(obj, (heuristics == HR_BULK_REBIAS), NULL); |
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
881 |
clean_up_cached_monitor_info(); |
1 | 882 |
} |
883 |
} |
|
884 |
||
885 |
||
886 |
void BiasedLocking::preserve_marks() { |
|
887 |
if (!UseBiasedLocking) |
|
888 |
return; |
|
889 |
||
890 |
assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint"); |
|
891 |
||
892 |
assert(_preserved_oop_stack == NULL, "double initialization"); |
|
893 |
assert(_preserved_mark_stack == NULL, "double initialization"); |
|
894 |
||
895 |
// In order to reduce the number of mark words preserved during GC |
|
896 |
// due to the presence of biased locking, we reinitialize most mark |
|
897 |
// words to the class's prototype during GC -- even those which have |
|
898 |
// a currently valid bias owner. One important situation where we |
|
899 |
// must not clobber a bias is when a biased object is currently |
|
900 |
// locked. To handle this case we iterate over the currently-locked |
|
901 |
// monitors in a prepass and, if they are biased, preserve their |
|
902 |
// mark words here. This should be a relatively small set of objects |
|
903 |
// especially compared to the number of objects in the heap. |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
904 |
_preserved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markWord>(10, true); |
13195 | 905 |
_preserved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Handle>(10, true); |
1 | 906 |
|
907 |
ResourceMark rm; |
|
908 |
Thread* cur = Thread::current(); |
|
48105
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47764
diff
changeset
|
909 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) { |
1 | 910 |
if (thread->has_last_Java_frame()) { |
911 |
RegisterMap rm(thread); |
|
912 |
for (javaVFrame* vf = thread->last_java_vframe(&rm); vf != NULL; vf = vf->java_sender()) { |
|
913 |
GrowableArray<MonitorInfo*> *monitors = vf->monitors(); |
|
914 |
if (monitors != NULL) { |
|
915 |
int len = monitors->length(); |
|
916 |
// Walk monitors youngest to oldest |
|
917 |
for (int i = len - 1; i >= 0; i--) { |
|
918 |
MonitorInfo* mon_info = monitors->at(i); |
|
3171
aa289b22b577
6837472: com/sun/jdi/MonitorFrameInfo.java fails with AggressiveOpts in 6u14
kvn
parents:
1600
diff
changeset
|
919 |
if (mon_info->owner_is_scalar_replaced()) continue; |
1 | 920 |
oop owner = mon_info->owner(); |
921 |
if (owner != NULL) { |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
922 |
markWord mark = owner->mark(); |
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
923 |
if (mark.has_bias_pattern()) { |
1 | 924 |
_preserved_oop_stack->push(Handle(cur, owner)); |
925 |
_preserved_mark_stack->push(mark); |
|
926 |
} |
|
927 |
} |
|
928 |
} |
|
929 |
} |
|
930 |
} |
|
931 |
} |
|
932 |
} |
|
933 |
} |
|
934 |
||
935 |
||
936 |
void BiasedLocking::restore_marks() { |
|
937 |
if (!UseBiasedLocking) |
|
938 |
return; |
|
939 |
||
940 |
assert(_preserved_oop_stack != NULL, "double free"); |
|
941 |
assert(_preserved_mark_stack != NULL, "double free"); |
|
942 |
||
943 |
int len = _preserved_oop_stack->length(); |
|
944 |
for (int i = 0; i < len; i++) { |
|
945 |
Handle owner = _preserved_oop_stack->at(i); |
|
57777
90ead0febf56
8229258: Rework markOop and markOopDesc into a simpler mark word value carrier
stefank
parents:
55625
diff
changeset
|
946 |
markWord mark = _preserved_mark_stack->at(i); |
1 | 947 |
owner->set_mark(mark); |
948 |
} |
|
949 |
||
950 |
delete _preserved_oop_stack; |
|
951 |
_preserved_oop_stack = NULL; |
|
952 |
delete _preserved_mark_stack; |
|
953 |
_preserved_mark_stack = NULL; |
|
954 |
} |
|
955 |
||
956 |
||
957 |
int* BiasedLocking::total_entry_count_addr() { return _counters.total_entry_count_addr(); } |
|
958 |
int* BiasedLocking::biased_lock_entry_count_addr() { return _counters.biased_lock_entry_count_addr(); } |
|
959 |
int* BiasedLocking::anonymously_biased_lock_entry_count_addr() { return _counters.anonymously_biased_lock_entry_count_addr(); } |
|
960 |
int* BiasedLocking::rebiased_lock_entry_count_addr() { return _counters.rebiased_lock_entry_count_addr(); } |
|
961 |
int* BiasedLocking::revoked_lock_entry_count_addr() { return _counters.revoked_lock_entry_count_addr(); } |
|
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
962 |
int* BiasedLocking::handshakes_count_addr() { return _counters.handshakes_count_addr(); } |
1 | 963 |
int* BiasedLocking::fast_path_entry_count_addr() { return _counters.fast_path_entry_count_addr(); } |
964 |
int* BiasedLocking::slow_path_entry_count_addr() { return _counters.slow_path_entry_count_addr(); } |
|
965 |
||
966 |
||
967 |
// BiasedLockingCounters |
|
968 |
||
54807 | 969 |
int BiasedLockingCounters::slow_path_entry_count() const { |
1 | 970 |
if (_slow_path_entry_count != 0) { |
971 |
return _slow_path_entry_count; |
|
972 |
} |
|
973 |
int sum = _biased_lock_entry_count + _anonymously_biased_lock_entry_count + |
|
974 |
_rebiased_lock_entry_count + _revoked_lock_entry_count + |
|
975 |
_fast_path_entry_count; |
|
976 |
||
977 |
return _total_entry_count - sum; |
|
978 |
} |
|
979 |
||
54807 | 980 |
void BiasedLockingCounters::print_on(outputStream* st) const { |
1 | 981 |
tty->print_cr("# total entries: %d", _total_entry_count); |
982 |
tty->print_cr("# biased lock entries: %d", _biased_lock_entry_count); |
|
983 |
tty->print_cr("# anonymously biased lock entries: %d", _anonymously_biased_lock_entry_count); |
|
984 |
tty->print_cr("# rebiased lock entries: %d", _rebiased_lock_entry_count); |
|
985 |
tty->print_cr("# revoked lock entries: %d", _revoked_lock_entry_count); |
|
55625
f7e8dbb77156
8191890: Biased locking still uses the inferior stop the world safepoint for revocation
pchilanomate
parents:
55537
diff
changeset
|
986 |
tty->print_cr("# handshakes entries: %d", _handshakes_count); |
1 | 987 |
tty->print_cr("# fast path lock entries: %d", _fast_path_entry_count); |
988 |
tty->print_cr("# slow path lock entries: %d", slow_path_entry_count()); |
|
989 |
} |
|
54807 | 990 |
|
991 |
void BiasedLockingCounters::print() const { print_on(tty); } |