author | redestad |
Mon, 01 Jul 2019 12:16:58 +0200 | |
changeset 55537 | 4309fedaf7dc |
parent 55514 | 03468b206457 |
child 55625 | f7e8dbb77156 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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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/markOop.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/atomic.hpp" |
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#include "runtime/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<markOop>* _preserved_mark_stack = NULL; |
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static void enable_biased_locking(InstanceKlass* k) { |
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k->set_prototype_header(markOopDesc::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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Mode evaluation_mode() const { return _async_safepoint; } |
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bool is_cheap_allocated() const { return true; } |
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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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// Use async VM operation to avoid blocking the Watcher thread. |
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// VM Thread will free C heap storage. |
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VM_EnableBiasedLocking *op = new VM_EnableBiasedLocking(); |
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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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static BiasedLocking::Condition revoke_bias(oop obj, bool allow_rebias, bool is_bulk, JavaThread* requesting_thread, JavaThread** biased_locker) { |
1 | 159 |
markOop mark = obj->mark(); |
160 |
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), (intptr_t) mark, |
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obj->klass()->external_name(), |
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169 |
(intptr_t) requesting_thread); |
1 | 170 |
} |
171 |
return BiasedLocking::NOT_BIASED; |
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172 |
} |
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173 |
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13925 | 174 |
uint age = mark->age(); |
1 | 175 |
markOop biased_prototype = markOopDesc::biased_locking_prototype()->set_age(age); |
176 |
markOop unbiased_prototype = markOopDesc::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) { |
1 | 180 |
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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", allow rebias %d, requesting thread " INTPTR_FORMAT, |
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p2i((void *)obj), |
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(intptr_t) mark, |
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obj->klass()->external_name(), |
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(intptr_t) obj->klass()->prototype_header(), |
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(allow_rebias ? 1 : 0), |
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189 |
(intptr_t) requesting_thread); |
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190 |
} else { |
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191 |
ResourceMark rm; |
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192 |
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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" , allow rebias %d , requesting thread " INTPTR_FORMAT, |
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p2i((void *)obj), |
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196 |
(intptr_t) mark, |
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obj->klass()->external_name(), |
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198 |
(intptr_t) obj->klass()->prototype_header(), |
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(allow_rebias ? 1 : 0), |
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200 |
(intptr_t) requesting_thread); |
1 | 201 |
} |
202 |
||
203 |
JavaThread* biased_thread = mark->biased_locker(); |
|
204 |
if (biased_thread == NULL) { |
|
205 |
// Object is anonymously biased. We can get here if, for |
|
206 |
// example, we revoke the bias due to an identity hash code |
|
207 |
// being computed for an object. |
|
208 |
if (!allow_rebias) { |
|
209 |
obj->set_mark(unbiased_prototype); |
|
210 |
} |
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// Log at "info" level if not bulk, else "trace" level |
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212 |
if (!is_bulk) { |
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213 |
log_info(biasedlocking)(" Revoked bias of anonymously-biased object"); |
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} else { |
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215 |
log_trace(biasedlocking)(" Revoked bias of anonymously-biased object"); |
1 | 216 |
} |
217 |
return BiasedLocking::BIAS_REVOKED; |
|
218 |
} |
|
219 |
||
220 |
// Handle case where the thread toward which the object was biased has exited |
|
221 |
bool thread_is_alive = false; |
|
222 |
if (requesting_thread == biased_thread) { |
|
223 |
thread_is_alive = true; |
|
224 |
} else { |
|
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ThreadsListHandle tlh; |
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226 |
thread_is_alive = tlh.includes(biased_thread); |
1 | 227 |
} |
228 |
if (!thread_is_alive) { |
|
229 |
if (allow_rebias) { |
|
230 |
obj->set_mark(biased_prototype); |
|
231 |
} else { |
|
232 |
obj->set_mark(unbiased_prototype); |
|
233 |
} |
|
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234 |
// Log at "info" level if not bulk, else "trace" level |
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235 |
if (!is_bulk) { |
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236 |
log_info(biasedlocking)(" Revoked bias of object biased toward dead thread (" |
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237 |
PTR_FORMAT ")", p2i(biased_thread)); |
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238 |
} else { |
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|
239 |
log_trace(biasedlocking)(" Revoked bias of object biased toward dead thread (" |
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|
240 |
PTR_FORMAT ")", p2i(biased_thread)); |
1 | 241 |
} |
242 |
return BiasedLocking::BIAS_REVOKED; |
|
243 |
} |
|
244 |
||
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245 |
// Log at "info" level if not bulk, else "trace" level |
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|
246 |
if (!is_bulk) { |
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|
247 |
log_info(biasedlocking)(" Revoked bias of object biased toward live thread (" |
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|
248 |
PTR_FORMAT ")", p2i(biased_thread)); |
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|
249 |
} else { |
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|
250 |
log_trace(biasedlocking)(" Revoked bias of object biased toward live thread (" |
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|
251 |
PTR_FORMAT ")", p2i(biased_thread)); |
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|
252 |
} |
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253 |
|
1 | 254 |
// Thread owning bias is alive. |
255 |
// Check to see whether it currently owns the lock and, if so, |
|
256 |
// write down the needed displaced headers to the thread's stack. |
|
257 |
// Otherwise, restore the object's header either to the unlocked |
|
258 |
// or unbiased state. |
|
259 |
GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(biased_thread); |
|
260 |
BasicLock* highest_lock = NULL; |
|
261 |
for (int i = 0; i < cached_monitor_info->length(); i++) { |
|
262 |
MonitorInfo* mon_info = cached_monitor_info->at(i); |
|
49658 | 263 |
if (oopDesc::equals(mon_info->owner(), obj)) { |
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|
264 |
log_trace(biasedlocking)(" mon_info->owner (" PTR_FORMAT ") == obj (" PTR_FORMAT ")", |
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|
265 |
p2i((void *) mon_info->owner()), |
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|
266 |
p2i((void *) obj)); |
1 | 267 |
// Assume recursive case and fix up highest lock later |
268 |
markOop mark = markOopDesc::encode((BasicLock*) NULL); |
|
269 |
highest_lock = mon_info->lock(); |
|
270 |
highest_lock->set_displaced_header(mark); |
|
271 |
} else { |
|
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|
272 |
log_trace(biasedlocking)(" mon_info->owner (" PTR_FORMAT ") != obj (" PTR_FORMAT ")", |
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|
273 |
p2i((void *) mon_info->owner()), |
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|
274 |
p2i((void *) obj)); |
1 | 275 |
} |
276 |
} |
|
277 |
if (highest_lock != NULL) { |
|
278 |
// Fix up highest lock to contain displaced header and point |
|
279 |
// object at it |
|
280 |
highest_lock->set_displaced_header(unbiased_prototype); |
|
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|
281 |
// Reset object header to point to displaced mark. |
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|
282 |
// Must release storing the lock address for platforms without TSO |
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|
283 |
// ordering (e.g. ppc). |
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|
284 |
obj->release_set_mark(markOopDesc::encode(highest_lock)); |
1 | 285 |
assert(!obj->mark()->has_bias_pattern(), "illegal mark state: stack lock used bias bit"); |
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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-locked object"); |
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|
289 |
} else { |
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|
290 |
log_trace(biasedlocking)(" Revoked bias of currently-locked object"); |
1 | 291 |
} |
292 |
} else { |
|
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|
293 |
// Log at "info" level if not bulk, else "trace" level |
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|
294 |
if (!is_bulk) { |
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|
295 |
log_info(biasedlocking)(" Revoked bias of currently-unlocked object"); |
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|
296 |
} else { |
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|
297 |
log_trace(biasedlocking)(" Revoked bias of currently-unlocked object"); |
1 | 298 |
} |
299 |
if (allow_rebias) { |
|
300 |
obj->set_mark(biased_prototype); |
|
301 |
} else { |
|
302 |
// Store the unlocked value into the object's header. |
|
303 |
obj->set_mark(unbiased_prototype); |
|
304 |
} |
|
305 |
} |
|
306 |
||
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|
307 |
// If requested, return information on which thread held the bias |
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308 |
if (biased_locker != NULL) { |
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|
309 |
*biased_locker = biased_thread; |
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|
310 |
} |
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|
311 |
|
1 | 312 |
return BiasedLocking::BIAS_REVOKED; |
313 |
} |
|
314 |
||
315 |
||
316 |
enum HeuristicsResult { |
|
317 |
HR_NOT_BIASED = 1, |
|
318 |
HR_SINGLE_REVOKE = 2, |
|
319 |
HR_BULK_REBIAS = 3, |
|
320 |
HR_BULK_REVOKE = 4 |
|
321 |
}; |
|
322 |
||
323 |
||
324 |
static HeuristicsResult update_heuristics(oop o, bool allow_rebias) { |
|
325 |
markOop mark = o->mark(); |
|
326 |
if (!mark->has_bias_pattern()) { |
|
327 |
return HR_NOT_BIASED; |
|
328 |
} |
|
329 |
||
330 |
// Heuristics to attempt to throttle the number of revocations. |
|
331 |
// Stages: |
|
332 |
// 1. Revoke the biases of all objects in the heap of this type, |
|
333 |
// but allow rebiasing of those objects if unlocked. |
|
334 |
// 2. Revoke the biases of all objects in the heap of this type |
|
335 |
// and don't allow rebiasing of these objects. Disable |
|
336 |
// allocation of objects of that type with the bias bit set. |
|
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|
337 |
Klass* k = o->klass(); |
1 | 338 |
jlong cur_time = os::javaTimeMillis(); |
339 |
jlong last_bulk_revocation_time = k->last_biased_lock_bulk_revocation_time(); |
|
340 |
int revocation_count = k->biased_lock_revocation_count(); |
|
341 |
if ((revocation_count >= BiasedLockingBulkRebiasThreshold) && |
|
342 |
(revocation_count < BiasedLockingBulkRevokeThreshold) && |
|
343 |
(last_bulk_revocation_time != 0) && |
|
344 |
(cur_time - last_bulk_revocation_time >= BiasedLockingDecayTime)) { |
|
345 |
// This is the first revocation we've seen in a while of an |
|
346 |
// object of this type since the last time we performed a bulk |
|
347 |
// rebiasing operation. The application is allocating objects in |
|
348 |
// bulk which are biased toward a thread and then handing them |
|
349 |
// off to another thread. We can cope with this allocation |
|
350 |
// pattern via the bulk rebiasing mechanism so we reset the |
|
351 |
// klass's revocation count rather than allow it to increase |
|
352 |
// monotonically. If we see the need to perform another bulk |
|
353 |
// rebias operation later, we will, and if subsequently we see |
|
354 |
// many more revocation operations in a short period of time we |
|
355 |
// will completely disable biasing for this type. |
|
356 |
k->set_biased_lock_revocation_count(0); |
|
357 |
revocation_count = 0; |
|
358 |
} |
|
359 |
||
360 |
// Make revocation count saturate just beyond BiasedLockingBulkRevokeThreshold |
|
361 |
if (revocation_count <= BiasedLockingBulkRevokeThreshold) { |
|
362 |
revocation_count = k->atomic_incr_biased_lock_revocation_count(); |
|
363 |
} |
|
364 |
||
365 |
if (revocation_count == BiasedLockingBulkRevokeThreshold) { |
|
366 |
return HR_BULK_REVOKE; |
|
367 |
} |
|
368 |
||
369 |
if (revocation_count == BiasedLockingBulkRebiasThreshold) { |
|
370 |
return HR_BULK_REBIAS; |
|
371 |
} |
|
372 |
||
373 |
return HR_SINGLE_REVOKE; |
|
374 |
} |
|
375 |
||
376 |
||
377 |
static BiasedLocking::Condition bulk_revoke_or_rebias_at_safepoint(oop o, |
|
378 |
bool bulk_rebias, |
|
379 |
bool attempt_rebias_of_object, |
|
380 |
JavaThread* requesting_thread) { |
|
381 |
assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint"); |
|
382 |
||
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|
383 |
log_info(biasedlocking)("* Beginning bulk revocation (kind == %s) because of object " |
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|
384 |
INTPTR_FORMAT " , mark " INTPTR_FORMAT " , type %s", |
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|
385 |
(bulk_rebias ? "rebias" : "revoke"), |
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|
386 |
p2i((void *) o), |
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|
387 |
(intptr_t) o->mark(), |
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|
388 |
o->klass()->external_name()); |
1 | 389 |
|
390 |
jlong cur_time = os::javaTimeMillis(); |
|
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|
391 |
o->klass()->set_last_biased_lock_bulk_revocation_time(cur_time); |
1 | 392 |
|
393 |
||
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|
394 |
Klass* k_o = o->klass(); |
14488 | 395 |
Klass* klass = k_o; |
1 | 396 |
|
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|
397 |
{ |
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|
398 |
JavaThreadIteratorWithHandle jtiwh; |
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|
399 |
|
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|
400 |
if (bulk_rebias) { |
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|
401 |
// Use the epoch in the klass of the object to implicitly revoke |
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|
402 |
// all biases of objects of this data type and force them to be |
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|
403 |
// reacquired. However, we also need to walk the stacks of all |
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|
404 |
// threads and update the headers of lightweight locked objects |
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|
405 |
// with biases to have the current epoch. |
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|
406 |
|
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|
407 |
// If the prototype header doesn't have the bias pattern, don't |
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|
408 |
// try to update the epoch -- assume another VM operation came in |
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|
409 |
// and reset the header to the unbiased state, which will |
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|
410 |
// implicitly cause all existing biases to be revoked |
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|
411 |
if (klass->prototype_header()->has_bias_pattern()) { |
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|
412 |
int prev_epoch = klass->prototype_header()->bias_epoch(); |
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|
413 |
klass->set_prototype_header(klass->prototype_header()->incr_bias_epoch()); |
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|
414 |
int cur_epoch = klass->prototype_header()->bias_epoch(); |
1 | 415 |
|
48105
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|
416 |
// Now walk all threads' stacks and adjust epochs of any biased |
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|
417 |
// and locked objects of this data type we encounter |
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|
418 |
for (; JavaThread *thr = jtiwh.next(); ) { |
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|
419 |
GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(thr); |
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|
420 |
for (int i = 0; i < cached_monitor_info->length(); i++) { |
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|
421 |
MonitorInfo* mon_info = cached_monitor_info->at(i); |
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|
422 |
oop owner = mon_info->owner(); |
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|
423 |
markOop mark = owner->mark(); |
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|
424 |
if ((owner->klass() == k_o) && mark->has_bias_pattern()) { |
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changeset
|
425 |
// We might have encountered this object already in the case of recursive locking |
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changeset
|
426 |
assert(mark->bias_epoch() == prev_epoch || mark->bias_epoch() == cur_epoch, "error in bias epoch adjustment"); |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47764
diff
changeset
|
427 |
owner->set_mark(mark->set_bias_epoch(cur_epoch)); |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
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diff
changeset
|
428 |
} |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
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diff
changeset
|
429 |
} |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47764
diff
changeset
|
430 |
} |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
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diff
changeset
|
431 |
} |
1 | 432 |
|
48105
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dcubed
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diff
changeset
|
433 |
// At this point we're done. All we have to do is potentially |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
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diff
changeset
|
434 |
// adjust the header of the given object to revoke its bias. |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
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diff
changeset
|
435 |
revoke_bias(o, attempt_rebias_of_object && klass->prototype_header()->has_bias_pattern(), true, requesting_thread, NULL); |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47764
diff
changeset
|
436 |
} else { |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
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diff
changeset
|
437 |
if (log_is_enabled(Info, biasedlocking)) { |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
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diff
changeset
|
438 |
ResourceMark rm; |
8d15b1369c7a
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diff
changeset
|
439 |
log_info(biasedlocking)("* Disabling biased locking for type %s", klass->external_name()); |
8d15b1369c7a
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parents:
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diff
changeset
|
440 |
} |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
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diff
changeset
|
441 |
|
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
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parents:
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diff
changeset
|
442 |
// Disable biased locking for this data type. Not only will this |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47764
diff
changeset
|
443 |
// cause future instances to not be biased, but existing biased |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
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diff
changeset
|
444 |
// instances will notice that this implicitly caused their biases |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
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parents:
47764
diff
changeset
|
445 |
// to be revoked. |
8d15b1369c7a
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dcubed
parents:
47764
diff
changeset
|
446 |
klass->set_prototype_header(markOopDesc::prototype()); |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47764
diff
changeset
|
447 |
|
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
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diff
changeset
|
448 |
// Now walk all threads' stacks and forcibly revoke the biases of |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
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diff
changeset
|
449 |
// any locked and biased objects of this data type we encounter. |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
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diff
changeset
|
450 |
for (; JavaThread *thr = jtiwh.next(); ) { |
1 | 451 |
GrowableArray<MonitorInfo*>* cached_monitor_info = get_or_compute_monitor_info(thr); |
452 |
for (int i = 0; i < cached_monitor_info->length(); i++) { |
|
453 |
MonitorInfo* mon_info = cached_monitor_info->at(i); |
|
454 |
oop owner = mon_info->owner(); |
|
455 |
markOop mark = owner->mark(); |
|
456 |
if ((owner->klass() == k_o) && mark->has_bias_pattern()) { |
|
48105
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changeset
|
457 |
revoke_bias(owner, false, true, requesting_thread, NULL); |
1 | 458 |
} |
459 |
} |
|
460 |
} |
|
461 |
||
48105
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changeset
|
462 |
// Must force the bias of the passed object to be forcibly revoked |
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
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parents:
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diff
changeset
|
463 |
// as well to ensure guarantees to callers |
8d15b1369c7a
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changeset
|
464 |
revoke_bias(o, false, true, requesting_thread, NULL); |
1 | 465 |
} |
48105
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changeset
|
466 |
} // ThreadsListHandle is destroyed here. |
1 | 467 |
|
36186
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rprotacio
parents:
29081
diff
changeset
|
468 |
log_info(biasedlocking)("* Ending bulk revocation"); |
1 | 469 |
|
470 |
BiasedLocking::Condition status_code = BiasedLocking::BIAS_REVOKED; |
|
471 |
||
472 |
if (attempt_rebias_of_object && |
|
473 |
o->mark()->has_bias_pattern() && |
|
474 |
klass->prototype_header()->has_bias_pattern()) { |
|
475 |
markOop new_mark = markOopDesc::encode(requesting_thread, o->mark()->age(), |
|
476 |
klass->prototype_header()->bias_epoch()); |
|
477 |
o->set_mark(new_mark); |
|
478 |
status_code = BiasedLocking::BIAS_REVOKED_AND_REBIASED; |
|
36186
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8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
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diff
changeset
|
479 |
log_info(biasedlocking)(" Rebiased object toward thread " INTPTR_FORMAT, (intptr_t) requesting_thread); |
1 | 480 |
} |
481 |
||
482 |
assert(!o->mark()->has_bias_pattern() || |
|
483 |
(attempt_rebias_of_object && (o->mark()->biased_locker() == requesting_thread)), |
|
484 |
"bug in bulk bias revocation"); |
|
485 |
||
486 |
return status_code; |
|
487 |
} |
|
488 |
||
489 |
||
490 |
static void clean_up_cached_monitor_info() { |
|
491 |
// Walk the thread list clearing out the cached monitors |
|
48105
8d15b1369c7a
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diff
changeset
|
492 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thr = jtiwh.next(); ) { |
1 | 493 |
thr->set_cached_monitor_info(NULL); |
494 |
} |
|
495 |
} |
|
496 |
||
497 |
||
498 |
class VM_RevokeBias : public VM_Operation { |
|
499 |
protected: |
|
500 |
Handle* _obj; |
|
501 |
GrowableArray<Handle>* _objs; |
|
502 |
JavaThread* _requesting_thread; |
|
503 |
BiasedLocking::Condition _status_code; |
|
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
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47632
diff
changeset
|
504 |
traceid _biased_locker_id; |
54710
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52877
diff
changeset
|
505 |
uint64_t _safepoint_id; |
1 | 506 |
|
507 |
public: |
|
508 |
VM_RevokeBias(Handle* obj, JavaThread* requesting_thread) |
|
509 |
: _obj(obj) |
|
510 |
, _objs(NULL) |
|
511 |
, _requesting_thread(requesting_thread) |
|
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
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47632
diff
changeset
|
512 |
, _status_code(BiasedLocking::NOT_BIASED) |
54710
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52877
diff
changeset
|
513 |
, _biased_locker_id(0) |
aa29971a17a1
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52877
diff
changeset
|
514 |
, _safepoint_id(0) {} |
1 | 515 |
|
516 |
VM_RevokeBias(GrowableArray<Handle>* objs, JavaThread* requesting_thread) |
|
517 |
: _obj(NULL) |
|
518 |
, _objs(objs) |
|
519 |
, _requesting_thread(requesting_thread) |
|
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
520 |
, _status_code(BiasedLocking::NOT_BIASED) |
54710
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pchilanomate
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52877
diff
changeset
|
521 |
, _biased_locker_id(0) |
aa29971a17a1
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diff
changeset
|
522 |
, _safepoint_id(0) {} |
1 | 523 |
|
524 |
virtual VMOp_Type type() const { return VMOp_RevokeBias; } |
|
525 |
||
526 |
virtual bool doit_prologue() { |
|
527 |
// Verify that there is actual work to do since the callers just |
|
528 |
// give us locked object(s). If we don't find any biased objects |
|
529 |
// there is nothing to do and we avoid a safepoint. |
|
530 |
if (_obj != NULL) { |
|
531 |
markOop mark = (*_obj)()->mark(); |
|
532 |
if (mark->has_bias_pattern()) { |
|
533 |
return true; |
|
534 |
} |
|
535 |
} else { |
|
536 |
for ( int i = 0 ; i < _objs->length(); i++ ) { |
|
537 |
markOop mark = (_objs->at(i))()->mark(); |
|
538 |
if (mark->has_bias_pattern()) { |
|
539 |
return true; |
|
540 |
} |
|
541 |
} |
|
542 |
} |
|
543 |
return false; |
|
544 |
} |
|
545 |
||
546 |
virtual void doit() { |
|
547 |
if (_obj != NULL) { |
|
36186
06763de0d7ad
8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents:
29081
diff
changeset
|
548 |
log_info(biasedlocking)("Revoking bias with potentially per-thread safepoint:"); |
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
549 |
JavaThread* biased_locker = NULL; |
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
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diff
changeset
|
550 |
_status_code = revoke_bias((*_obj)(), false, false, _requesting_thread, &biased_locker); |
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
551 |
if (biased_locker != NULL) { |
50113 | 552 |
_biased_locker_id = JFR_THREAD_ID(biased_locker); |
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
553 |
} |
55514
03468b206457
8225702: Safepoint counter can't be used for safepoint detection
rehn
parents:
55479
diff
changeset
|
554 |
_safepoint_id = SafepointSynchronize::safepoint_id(); |
1 | 555 |
clean_up_cached_monitor_info(); |
556 |
return; |
|
557 |
} else { |
|
36186
06763de0d7ad
8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents:
29081
diff
changeset
|
558 |
log_info(biasedlocking)("Revoking bias with global safepoint:"); |
1 | 559 |
BiasedLocking::revoke_at_safepoint(_objs); |
560 |
} |
|
561 |
} |
|
562 |
||
563 |
BiasedLocking::Condition status_code() const { |
|
564 |
return _status_code; |
|
565 |
} |
|
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
566 |
|
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
567 |
traceid biased_locker() const { |
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
568 |
return _biased_locker_id; |
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
569 |
} |
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
570 |
|
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
571 |
uint64_t safepoint_id() const { |
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
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parents:
52877
diff
changeset
|
572 |
return _safepoint_id; |
aa29971a17a1
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pchilanomate
parents:
52877
diff
changeset
|
573 |
} |
1 | 574 |
}; |
575 |
||
576 |
||
577 |
class VM_BulkRevokeBias : public VM_RevokeBias { |
|
578 |
private: |
|
579 |
bool _bulk_rebias; |
|
580 |
bool _attempt_rebias_of_object; |
|
581 |
||
582 |
public: |
|
583 |
VM_BulkRevokeBias(Handle* obj, JavaThread* requesting_thread, |
|
584 |
bool bulk_rebias, |
|
585 |
bool attempt_rebias_of_object) |
|
586 |
: VM_RevokeBias(obj, requesting_thread) |
|
587 |
, _bulk_rebias(bulk_rebias) |
|
588 |
, _attempt_rebias_of_object(attempt_rebias_of_object) {} |
|
589 |
||
590 |
virtual VMOp_Type type() const { return VMOp_BulkRevokeBias; } |
|
591 |
virtual bool doit_prologue() { return true; } |
|
592 |
||
593 |
virtual void doit() { |
|
594 |
_status_code = bulk_revoke_or_rebias_at_safepoint((*_obj)(), _bulk_rebias, _attempt_rebias_of_object, _requesting_thread); |
|
55514
03468b206457
8225702: Safepoint counter can't be used for safepoint detection
rehn
parents:
55479
diff
changeset
|
595 |
_safepoint_id = SafepointSynchronize::safepoint_id(); |
1 | 596 |
clean_up_cached_monitor_info(); |
597 |
} |
|
54710
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pchilanomate
parents:
52877
diff
changeset
|
598 |
|
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
599 |
bool is_bulk_rebias() const { |
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
600 |
return _bulk_rebias; |
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
601 |
} |
1 | 602 |
}; |
603 |
||
50113 | 604 |
static void post_self_revocation_event(EventBiasedLockSelfRevocation* event, Klass* k) { |
605 |
assert(event != NULL, "invariant"); |
|
606 |
assert(k != NULL, "invariant"); |
|
607 |
assert(event->should_commit(), "invariant"); |
|
608 |
event->set_lockClass(k); |
|
609 |
event->commit(); |
|
610 |
} |
|
611 |
||
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
612 |
static void post_revocation_event(EventBiasedLockRevocation* event, Klass* k, VM_RevokeBias* op) { |
50113 | 613 |
assert(event != NULL, "invariant"); |
614 |
assert(k != NULL, "invariant"); |
|
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
615 |
assert(op != NULL, "invariant"); |
50113 | 616 |
assert(event->should_commit(), "invariant"); |
617 |
event->set_lockClass(k); |
|
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
618 |
event->set_safepointId(op->safepoint_id()); |
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
619 |
event->set_previousOwner(op->biased_locker()); |
50113 | 620 |
event->commit(); |
621 |
} |
|
622 |
||
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
623 |
static void post_class_revocation_event(EventBiasedLockClassRevocation* event, Klass* k, VM_BulkRevokeBias* op) { |
50113 | 624 |
assert(event != NULL, "invariant"); |
625 |
assert(k != NULL, "invariant"); |
|
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
626 |
assert(op != NULL, "invariant"); |
50113 | 627 |
assert(event->should_commit(), "invariant"); |
628 |
event->set_revokedClass(k); |
|
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
629 |
event->set_disableBiasing(!op->is_bulk_rebias()); |
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
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52877
diff
changeset
|
630 |
event->set_safepointId(op->safepoint_id()); |
50113 | 631 |
event->commit(); |
632 |
} |
|
1 | 633 |
|
634 |
BiasedLocking::Condition BiasedLocking::revoke_and_rebias(Handle obj, bool attempt_rebias, TRAPS) { |
|
635 |
assert(!SafepointSynchronize::is_at_safepoint(), "must not be called while at safepoint"); |
|
636 |
||
637 |
// We can revoke the biases of anonymously-biased objects |
|
638 |
// efficiently enough that we should not cause these revocations to |
|
639 |
// update the heuristics because doing so may cause unwanted bulk |
|
640 |
// revocations (which are expensive) to occur. |
|
641 |
markOop mark = obj->mark(); |
|
642 |
if (mark->is_biased_anonymously() && !attempt_rebias) { |
|
643 |
// We are probably trying to revoke the bias of this object due to |
|
644 |
// an identity hash code computation. Try to revoke the bias |
|
645 |
// without a safepoint. This is possible if we can successfully |
|
646 |
// compare-and-exchange an unbiased header into the mark word of |
|
647 |
// the object, meaning that no other thread has raced to acquire |
|
648 |
// the bias of the object. |
|
649 |
markOop biased_value = mark; |
|
650 |
markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
40655
diff
changeset
|
651 |
markOop res_mark = obj->cas_set_mark(unbiased_prototype, mark); |
1 | 652 |
if (res_mark == biased_value) { |
653 |
return BIAS_REVOKED; |
|
654 |
} |
|
655 |
} else if (mark->has_bias_pattern()) { |
|
14488 | 656 |
Klass* k = obj->klass(); |
1 | 657 |
markOop prototype_header = k->prototype_header(); |
658 |
if (!prototype_header->has_bias_pattern()) { |
|
659 |
// This object has a stale bias from before the bulk revocation |
|
660 |
// for this data type occurred. It's pointless to update the |
|
661 |
// heuristics at this point so simply update the header with a |
|
662 |
// CAS. If we fail this race, the object's bias has been revoked |
|
663 |
// by another thread so we simply return and let the caller deal |
|
664 |
// with it. |
|
665 |
markOop biased_value = mark; |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
40655
diff
changeset
|
666 |
markOop res_mark = obj->cas_set_mark(prototype_header, mark); |
49722
a47d1e21b3f1
8199735: Mark word updates need to use Access API
rkennke
parents:
49658
diff
changeset
|
667 |
assert(!obj->mark()->has_bias_pattern(), "even if we raced, should still be revoked"); |
1 | 668 |
return BIAS_REVOKED; |
669 |
} else if (prototype_header->bias_epoch() != mark->bias_epoch()) { |
|
670 |
// The epoch of this biasing has expired indicating that the |
|
671 |
// object is effectively unbiased. Depending on whether we need |
|
672 |
// to rebias or revoke the bias of this object we can do it |
|
673 |
// efficiently enough with a CAS that we shouldn't update the |
|
674 |
// heuristics. This is normally done in the assembly code but we |
|
675 |
// can reach this point due to various points in the runtime |
|
676 |
// needing to revoke biases. |
|
677 |
if (attempt_rebias) { |
|
678 |
assert(THREAD->is_Java_thread(), ""); |
|
679 |
markOop biased_value = mark; |
|
680 |
markOop rebiased_prototype = markOopDesc::encode((JavaThread*) THREAD, mark->age(), prototype_header->bias_epoch()); |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
40655
diff
changeset
|
681 |
markOop res_mark = obj->cas_set_mark(rebiased_prototype, mark); |
1 | 682 |
if (res_mark == biased_value) { |
683 |
return BIAS_REVOKED_AND_REBIASED; |
|
684 |
} |
|
685 |
} else { |
|
686 |
markOop biased_value = mark; |
|
687 |
markOop unbiased_prototype = markOopDesc::prototype()->set_age(mark->age()); |
|
46678
9b8b0fe92c93
8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header
rkennke
parents:
40655
diff
changeset
|
688 |
markOop res_mark = obj->cas_set_mark(unbiased_prototype, mark); |
1 | 689 |
if (res_mark == biased_value) { |
690 |
return BIAS_REVOKED; |
|
691 |
} |
|
692 |
} |
|
693 |
} |
|
694 |
} |
|
695 |
||
696 |
HeuristicsResult heuristics = update_heuristics(obj(), attempt_rebias); |
|
697 |
if (heuristics == HR_NOT_BIASED) { |
|
698 |
return NOT_BIASED; |
|
699 |
} else if (heuristics == HR_SINGLE_REVOKE) { |
|
14488 | 700 |
Klass *k = obj->klass(); |
1600
776009a04496
6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents:
670
diff
changeset
|
701 |
markOop prototype_header = k->prototype_header(); |
776009a04496
6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents:
670
diff
changeset
|
702 |
if (mark->biased_locker() == THREAD && |
776009a04496
6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents:
670
diff
changeset
|
703 |
prototype_header->bias_epoch() == mark->bias_epoch()) { |
1 | 704 |
// A thread is trying to revoke the bias of an object biased |
705 |
// toward it, again likely due to an identity hash code |
|
706 |
// computation. We can again avoid a safepoint in this case |
|
707 |
// since we are only going to walk our own stack. There are no |
|
708 |
// races with revocations occurring in other threads because we |
|
709 |
// reach no safepoints in the revocation path. |
|
1600
776009a04496
6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents:
670
diff
changeset
|
710 |
// Also check the epoch because even if threads match, another thread |
776009a04496
6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents:
670
diff
changeset
|
711 |
// can come in with a CAS to steal the bias of an object that has a |
776009a04496
6676175: BigApps crash JVM Client VM (build 10.0-b22, mixed mode, sharing) with SIGSEGV (0xb)
coleenp
parents:
670
diff
changeset
|
712 |
// stale epoch. |
1 | 713 |
ResourceMark rm; |
36186
06763de0d7ad
8149383: Convert TraceBiasedLocking to Unified Logging
rprotacio
parents:
29081
diff
changeset
|
714 |
log_info(biasedlocking)("Revoking bias by walking my own stack:"); |
47632
0c2e1f8eccaa
8187042: Events to show which objects are associated with biased object revocations
egahlin
parents:
47216
diff
changeset
|
715 |
EventBiasedLockSelfRevocation event; |
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
716 |
BiasedLocking::Condition cond = revoke_bias(obj(), false, false, (JavaThread*) THREAD, NULL); |
1 | 717 |
((JavaThread*) THREAD)->set_cached_monitor_info(NULL); |
718 |
assert(cond == BIAS_REVOKED, "why not?"); |
|
47632
0c2e1f8eccaa
8187042: Events to show which objects are associated with biased object revocations
egahlin
parents:
47216
diff
changeset
|
719 |
if (event.should_commit()) { |
50113 | 720 |
post_self_revocation_event(&event, k); |
47632
0c2e1f8eccaa
8187042: Events to show which objects are associated with biased object revocations
egahlin
parents:
47216
diff
changeset
|
721 |
} |
1 | 722 |
return cond; |
723 |
} else { |
|
47632
0c2e1f8eccaa
8187042: Events to show which objects are associated with biased object revocations
egahlin
parents:
47216
diff
changeset
|
724 |
EventBiasedLockRevocation event; |
1 | 725 |
VM_RevokeBias revoke(&obj, (JavaThread*) THREAD); |
726 |
VMThread::execute(&revoke); |
|
50113 | 727 |
if (event.should_commit() && revoke.status_code() != NOT_BIASED) { |
728 |
post_revocation_event(&event, k, &revoke); |
|
47632
0c2e1f8eccaa
8187042: Events to show which objects are associated with biased object revocations
egahlin
parents:
47216
diff
changeset
|
729 |
} |
1 | 730 |
return revoke.status_code(); |
731 |
} |
|
732 |
} |
|
733 |
||
734 |
assert((heuristics == HR_BULK_REVOKE) || |
|
735 |
(heuristics == HR_BULK_REBIAS), "?"); |
|
47632
0c2e1f8eccaa
8187042: Events to show which objects are associated with biased object revocations
egahlin
parents:
47216
diff
changeset
|
736 |
EventBiasedLockClassRevocation event; |
1 | 737 |
VM_BulkRevokeBias bulk_revoke(&obj, (JavaThread*) THREAD, |
738 |
(heuristics == HR_BULK_REBIAS), |
|
739 |
attempt_rebias); |
|
740 |
VMThread::execute(&bulk_revoke); |
|
47632
0c2e1f8eccaa
8187042: Events to show which objects are associated with biased object revocations
egahlin
parents:
47216
diff
changeset
|
741 |
if (event.should_commit()) { |
54710
aa29971a17a1
8220724: TestBiasedLockRevocationEvents fails while matching revoke events to VMOperation events
pchilanomate
parents:
52877
diff
changeset
|
742 |
post_class_revocation_event(&event, obj->klass(), &bulk_revoke); |
47632
0c2e1f8eccaa
8187042: Events to show which objects are associated with biased object revocations
egahlin
parents:
47216
diff
changeset
|
743 |
} |
1 | 744 |
return bulk_revoke.status_code(); |
745 |
} |
|
746 |
||
747 |
||
748 |
void BiasedLocking::revoke(GrowableArray<Handle>* objs) { |
|
749 |
assert(!SafepointSynchronize::is_at_safepoint(), "must not be called while at safepoint"); |
|
750 |
if (objs->length() == 0) { |
|
751 |
return; |
|
752 |
} |
|
753 |
VM_RevokeBias revoke(objs, JavaThread::current()); |
|
754 |
VMThread::execute(&revoke); |
|
755 |
} |
|
756 |
||
757 |
||
758 |
void BiasedLocking::revoke_at_safepoint(Handle h_obj) { |
|
759 |
assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint"); |
|
760 |
oop obj = h_obj(); |
|
761 |
HeuristicsResult heuristics = update_heuristics(obj, false); |
|
762 |
if (heuristics == HR_SINGLE_REVOKE) { |
|
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
763 |
revoke_bias(obj, false, false, NULL, NULL); |
1 | 764 |
} else if ((heuristics == HR_BULK_REBIAS) || |
765 |
(heuristics == HR_BULK_REVOKE)) { |
|
766 |
bulk_revoke_or_rebias_at_safepoint(obj, (heuristics == HR_BULK_REBIAS), false, NULL); |
|
767 |
} |
|
768 |
clean_up_cached_monitor_info(); |
|
769 |
} |
|
770 |
||
771 |
||
772 |
void BiasedLocking::revoke_at_safepoint(GrowableArray<Handle>* objs) { |
|
773 |
assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint"); |
|
774 |
int len = objs->length(); |
|
775 |
for (int i = 0; i < len; i++) { |
|
776 |
oop obj = (objs->at(i))(); |
|
777 |
HeuristicsResult heuristics = update_heuristics(obj, false); |
|
778 |
if (heuristics == HR_SINGLE_REVOKE) { |
|
47764
029d5efaaa6c
8189368: Add information on current bias holder for BiasedLockRevocation event
egahlin
parents:
47632
diff
changeset
|
779 |
revoke_bias(obj, false, false, NULL, NULL); |
1 | 780 |
} else if ((heuristics == HR_BULK_REBIAS) || |
781 |
(heuristics == HR_BULK_REVOKE)) { |
|
782 |
bulk_revoke_or_rebias_at_safepoint(obj, (heuristics == HR_BULK_REBIAS), false, NULL); |
|
783 |
} |
|
784 |
} |
|
785 |
clean_up_cached_monitor_info(); |
|
786 |
} |
|
787 |
||
788 |
||
789 |
void BiasedLocking::preserve_marks() { |
|
790 |
if (!UseBiasedLocking) |
|
791 |
return; |
|
792 |
||
793 |
assert(SafepointSynchronize::is_at_safepoint(), "must only be called while at safepoint"); |
|
794 |
||
795 |
assert(_preserved_oop_stack == NULL, "double initialization"); |
|
796 |
assert(_preserved_mark_stack == NULL, "double initialization"); |
|
797 |
||
798 |
// In order to reduce the number of mark words preserved during GC |
|
799 |
// due to the presence of biased locking, we reinitialize most mark |
|
800 |
// words to the class's prototype during GC -- even those which have |
|
801 |
// a currently valid bias owner. One important situation where we |
|
802 |
// must not clobber a bias is when a biased object is currently |
|
803 |
// locked. To handle this case we iterate over the currently-locked |
|
804 |
// monitors in a prepass and, if they are biased, preserve their |
|
805 |
// mark words here. This should be a relatively small set of objects |
|
806 |
// especially compared to the number of objects in the heap. |
|
13195 | 807 |
_preserved_mark_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<markOop>(10, true); |
808 |
_preserved_oop_stack = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Handle>(10, true); |
|
1 | 809 |
|
810 |
ResourceMark rm; |
|
811 |
Thread* cur = Thread::current(); |
|
48105
8d15b1369c7a
8167108: inconsistent handling of SR_lock can lead to crashes
dcubed
parents:
47764
diff
changeset
|
812 |
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) { |
1 | 813 |
if (thread->has_last_Java_frame()) { |
814 |
RegisterMap rm(thread); |
|
815 |
for (javaVFrame* vf = thread->last_java_vframe(&rm); vf != NULL; vf = vf->java_sender()) { |
|
816 |
GrowableArray<MonitorInfo*> *monitors = vf->monitors(); |
|
817 |
if (monitors != NULL) { |
|
818 |
int len = monitors->length(); |
|
819 |
// Walk monitors youngest to oldest |
|
820 |
for (int i = len - 1; i >= 0; i--) { |
|
821 |
MonitorInfo* mon_info = monitors->at(i); |
|
3171
aa289b22b577
6837472: com/sun/jdi/MonitorFrameInfo.java fails with AggressiveOpts in 6u14
kvn
parents:
1600
diff
changeset
|
822 |
if (mon_info->owner_is_scalar_replaced()) continue; |
1 | 823 |
oop owner = mon_info->owner(); |
824 |
if (owner != NULL) { |
|
825 |
markOop mark = owner->mark(); |
|
826 |
if (mark->has_bias_pattern()) { |
|
827 |
_preserved_oop_stack->push(Handle(cur, owner)); |
|
828 |
_preserved_mark_stack->push(mark); |
|
829 |
} |
|
830 |
} |
|
831 |
} |
|
832 |
} |
|
833 |
} |
|
834 |
} |
|
835 |
} |
|
836 |
} |
|
837 |
||
838 |
||
839 |
void BiasedLocking::restore_marks() { |
|
840 |
if (!UseBiasedLocking) |
|
841 |
return; |
|
842 |
||
843 |
assert(_preserved_oop_stack != NULL, "double free"); |
|
844 |
assert(_preserved_mark_stack != NULL, "double free"); |
|
845 |
||
846 |
int len = _preserved_oop_stack->length(); |
|
847 |
for (int i = 0; i < len; i++) { |
|
848 |
Handle owner = _preserved_oop_stack->at(i); |
|
849 |
markOop mark = _preserved_mark_stack->at(i); |
|
850 |
owner->set_mark(mark); |
|
851 |
} |
|
852 |
||
853 |
delete _preserved_oop_stack; |
|
854 |
_preserved_oop_stack = NULL; |
|
855 |
delete _preserved_mark_stack; |
|
856 |
_preserved_mark_stack = NULL; |
|
857 |
} |
|
858 |
||
859 |
||
860 |
int* BiasedLocking::total_entry_count_addr() { return _counters.total_entry_count_addr(); } |
|
861 |
int* BiasedLocking::biased_lock_entry_count_addr() { return _counters.biased_lock_entry_count_addr(); } |
|
862 |
int* BiasedLocking::anonymously_biased_lock_entry_count_addr() { return _counters.anonymously_biased_lock_entry_count_addr(); } |
|
863 |
int* BiasedLocking::rebiased_lock_entry_count_addr() { return _counters.rebiased_lock_entry_count_addr(); } |
|
864 |
int* BiasedLocking::revoked_lock_entry_count_addr() { return _counters.revoked_lock_entry_count_addr(); } |
|
865 |
int* BiasedLocking::fast_path_entry_count_addr() { return _counters.fast_path_entry_count_addr(); } |
|
866 |
int* BiasedLocking::slow_path_entry_count_addr() { return _counters.slow_path_entry_count_addr(); } |
|
867 |
||
868 |
||
869 |
// BiasedLockingCounters |
|
870 |
||
54807 | 871 |
int BiasedLockingCounters::slow_path_entry_count() const { |
1 | 872 |
if (_slow_path_entry_count != 0) { |
873 |
return _slow_path_entry_count; |
|
874 |
} |
|
875 |
int sum = _biased_lock_entry_count + _anonymously_biased_lock_entry_count + |
|
876 |
_rebiased_lock_entry_count + _revoked_lock_entry_count + |
|
877 |
_fast_path_entry_count; |
|
878 |
||
879 |
return _total_entry_count - sum; |
|
880 |
} |
|
881 |
||
54807 | 882 |
void BiasedLockingCounters::print_on(outputStream* st) const { |
1 | 883 |
tty->print_cr("# total entries: %d", _total_entry_count); |
884 |
tty->print_cr("# biased lock entries: %d", _biased_lock_entry_count); |
|
885 |
tty->print_cr("# anonymously biased lock entries: %d", _anonymously_biased_lock_entry_count); |
|
886 |
tty->print_cr("# rebiased lock entries: %d", _rebiased_lock_entry_count); |
|
887 |
tty->print_cr("# revoked lock entries: %d", _revoked_lock_entry_count); |
|
888 |
tty->print_cr("# fast path lock entries: %d", _fast_path_entry_count); |
|
889 |
tty->print_cr("# slow path lock entries: %d", slow_path_entry_count()); |
|
890 |
} |
|
54807 | 891 |
|
892 |
void BiasedLockingCounters::print() const { print_on(tty); } |