author | rwestberg |
Mon, 04 Jun 2018 16:21:08 +0200 | |
changeset 50391 | 2bea53d7a27b |
parent 50336 | 1b6ea6bcd21a |
child 51214 | 67736b4846a0 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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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package jdk.jfr.event.runtime; |
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import jdk.jfr.Recording; |
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import jdk.jfr.consumer.*; |
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import jdk.test.lib.Asserts; |
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import jdk.test.lib.dcmd.PidJcmdExecutor; |
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import jdk.test.lib.jfr.EventNames; |
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import jdk.test.lib.jfr.Events; |
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import jdk.test.lib.process.OutputAnalyzer; |
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import java.util.*; |
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import java.util.concurrent.FutureTask; |
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import java.util.stream.Collectors; |
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/* |
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* @test |
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* @key jfr |
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* @library /test/lib |
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* |
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* @run main/othervm jdk.jfr.event.runtime.TestBiasedLockRevocationEvents |
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*/ |
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public class TestBiasedLockRevocationEvents { |
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public static void main(String[] args) throws Throwable { |
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testSingleRevocation(); |
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testBulkRevocation(); |
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testSelfRevocation(); |
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testExitedThreadRevocation(); |
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testBulkRevocationNoRebias(); |
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testRevocationSafepointIdCorrelation(); |
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} |
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// Default value of BiasedLockingBulkRebiasThreshold is 20, and BiasedLockingBulkRevokeTreshold is 40. |
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// Using a value that will hit the first threshold once, and the second one the next time. |
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private static final int BULK_REVOKE_THRESHOLD = 25; |
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static void touch(Object lock) { |
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synchronized(lock) { |
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} |
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} |
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static Thread triggerRevocation(int numRevokes, Class<?> lockClass) throws Throwable { |
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Object[] locks = new Object[numRevokes]; |
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for (int i = 0; i < locks.length; ++i) { |
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locks[i] = lockClass.getDeclaredConstructor().newInstance(); |
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touch(locks[i]); |
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} |
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Thread biasBreaker = new Thread("BiasBreaker") { |
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@Override |
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public void run() { |
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for (Object lock : locks) { |
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touch(lock); |
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} |
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} |
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}; |
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biasBreaker.start(); |
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biasBreaker.join(); |
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return biasBreaker; |
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} |
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// Basic stack trace validation, checking the name of the leaf method |
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static void validateStackTrace(RecordedStackTrace stackTrace, String leafMethodName) { |
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List<RecordedFrame> frames = stackTrace.getFrames(); |
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Asserts.assertFalse(frames.isEmpty()); |
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String name = frames.get(0).getMethod().getName(); |
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Asserts.assertEquals(name, leafMethodName); |
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} |
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// Validates that the given stack trace refers to lock.touch(); in triggerRevocation |
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static void validateStackTrace(RecordedStackTrace stackTrace) { |
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validateStackTrace(stackTrace, "touch"); |
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} |
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// Retrieve all biased lock revocation events related to the provided lock class, sorted by start time |
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static List<RecordedEvent> getRevocationEvents(Recording recording, String fieldName, Class<?> lockClass) throws Throwable { |
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return Events.fromRecording(recording).stream() |
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.filter(e -> ((RecordedClass)e.getValue(fieldName)).getName().equals(lockClass.getName())) |
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.sorted(Comparator.comparing(RecordedEvent::getStartTime)) |
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.collect(Collectors.toList()); |
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} |
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static void testSingleRevocation() throws Throwable { |
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class MyLock {}; |
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Recording recording = new Recording(); |
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recording.enable(EventNames.BiasedLockRevocation); |
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recording.start(); |
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Thread biasBreaker = triggerRevocation(1, MyLock.class); |
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recording.stop(); |
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List<RecordedEvent> events = getRevocationEvents(recording, "lockClass", MyLock.class); |
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Asserts.assertEQ(events.size(), 1); |
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RecordedEvent event = events.get(0); |
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Events.assertEventThread(event, biasBreaker); |
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Events.assertEventThread(event, "previousOwner", Thread.currentThread()); |
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RecordedClass lockClass = event.getValue("lockClass"); |
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Asserts.assertEquals(lockClass.getName(), MyLock.class.getName()); |
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validateStackTrace(event.getStackTrace()); |
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} |
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static void testBulkRevocation() throws Throwable { |
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class MyLock {}; |
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Recording recording = new Recording(); |
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recording.enable(EventNames.BiasedLockClassRevocation); |
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recording.start(); |
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Thread biasBreaker = triggerRevocation(BULK_REVOKE_THRESHOLD, MyLock.class); |
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recording.stop(); |
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List<RecordedEvent> events = getRevocationEvents(recording, "revokedClass", MyLock.class); |
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Asserts.assertEQ(events.size(), 1); |
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RecordedEvent event = events.get(0); |
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Events.assertEventThread(event, biasBreaker); |
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Events.assertField(event, "disableBiasing").equal(false); |
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RecordedClass lockClass = event.getValue("revokedClass"); |
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Asserts.assertEquals(lockClass.getName(), MyLock.class.getName()); |
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validateStackTrace(event.getStackTrace()); |
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} |
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static void testSelfRevocation() throws Throwable { |
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class MyLock {}; |
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Recording recording = new Recording(); |
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recording.enable(EventNames.BiasedLockSelfRevocation); |
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recording.start(); |
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MyLock l = new MyLock(); |
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touch(l); |
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Thread.holdsLock(l); |
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recording.stop(); |
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List<RecordedEvent> events = getRevocationEvents(recording, "lockClass", MyLock.class); |
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Asserts.assertEQ(events.size(), 1); |
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RecordedEvent event = events.get(0); |
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Events.assertEventThread(event, Thread.currentThread()); |
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validateStackTrace(event.getStackTrace(), "holdsLock"); |
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} |
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static void testExitedThreadRevocation() throws Throwable { |
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class MyLock {}; |
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Recording recording = new Recording(); |
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recording.enable(EventNames.BiasedLockRevocation); |
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recording.start(); |
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FutureTask<MyLock> lockerTask = new FutureTask<>(() -> { |
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MyLock l = new MyLock(); |
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touch(l); |
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return l; |
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}); |
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Thread locker = new Thread(lockerTask, "BiasLocker"); |
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locker.start(); |
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locker.join(); |
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// Even after joining, the VM has a bit more work to do before the thread is actually removed |
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// from the threads list. Ensure that this has happened before proceeding. |
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while (true) { |
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PidJcmdExecutor jcmd = new PidJcmdExecutor(); |
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OutputAnalyzer oa = jcmd.execute("Thread.print", true); |
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String lockerThreadFound = oa.firstMatch("BiasLocker"); |
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if (lockerThreadFound == null) { |
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break; |
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} |
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}; |
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MyLock l = lockerTask.get(); |
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touch(l); |
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recording.stop(); |
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List<RecordedEvent> events = getRevocationEvents(recording, "lockClass", MyLock.class); |
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Asserts.assertEQ(events.size(), 1); |
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RecordedEvent event = events.get(0); |
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Events.assertEventThread(event, Thread.currentThread()); |
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// Previous owner will usually be null, but can also be a thread that |
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// was created after the BiasLocker thread exited due to address reuse. |
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RecordedThread prevOwner = event.getValue("previousOwner"); |
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if (prevOwner != null) { |
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Asserts.assertNE(prevOwner.getJavaName(), "BiasLocker"); |
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} |
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validateStackTrace(event.getStackTrace()); |
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} |
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static void testBulkRevocationNoRebias() throws Throwable { |
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class MyLock {}; |
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Recording recording = new Recording(); |
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recording.enable(EventNames.BiasedLockClassRevocation); |
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recording.start(); |
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Thread biasBreaker0 = triggerRevocation(BULK_REVOKE_THRESHOLD, MyLock.class); |
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Thread biasBreaker1 = triggerRevocation(BULK_REVOKE_THRESHOLD, MyLock.class); |
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recording.stop(); |
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List<RecordedEvent> events = getRevocationEvents(recording, "revokedClass", MyLock.class); |
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Asserts.assertEQ(events.size(), 2); |
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// The rebias event should occur before the noRebias one |
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RecordedEvent eventRebias = events.get(0); |
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RecordedEvent eventNoRebias = events.get(1); |
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Events.assertEventThread(eventRebias, biasBreaker0); |
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Events.assertField(eventRebias, "disableBiasing").equal(false); |
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Events.assertEventThread(eventNoRebias, biasBreaker1); |
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Events.assertField(eventNoRebias, "disableBiasing").equal(true); |
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RecordedClass lockClassRebias = eventRebias.getValue("revokedClass"); |
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Asserts.assertEquals(lockClassRebias.getName(), MyLock.class.getName()); |
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RecordedClass lockClassNoRebias = eventNoRebias.getValue("revokedClass"); |
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Asserts.assertEquals(lockClassNoRebias.getName(), MyLock.class.getName()); |
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validateStackTrace(eventRebias.getStackTrace()); |
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validateStackTrace(eventNoRebias.getStackTrace()); |
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} |
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static void testRevocationSafepointIdCorrelation() throws Throwable { |
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class MyLock {}; |
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Recording recording = new Recording(); |
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recording.enable(EventNames.BiasedLockRevocation); |
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recording.enable(EventNames.BiasedLockClassRevocation); |
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recording.enable(EventNames.ExecuteVMOperation); |
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recording.start(); |
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triggerRevocation(BULK_REVOKE_THRESHOLD, MyLock.class); |
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recording.stop(); |
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List<RecordedEvent> events = Events.fromRecording(recording); |
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// Determine which safepoints included single and bulk revocation VM operations |
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Set<Integer> vmOperationsSingle = new HashSet<>(); |
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Set<Integer> vmOperationsBulk = new HashSet<>(); |
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for (RecordedEvent event : events) { |
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if (event.getEventType().getName().equals(EventNames.ExecuteVMOperation)) { |
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String operation = event.getValue("operation"); |
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Integer safepointId = event.getValue("safepointId"); |
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if (operation.equals("RevokeBias")) { |
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vmOperationsSingle.add(safepointId); |
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} else if (operation.equals("BulkRevokeBias")) { |
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vmOperationsBulk.add(safepointId); |
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} |
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} |
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} |
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int revokeCount = 0; |
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int bulkRevokeCount = 0; |
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// Match all revoke events to a corresponding VMOperation event |
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for (RecordedEvent event : events) { |
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if (event.getEventType().getName().equals(EventNames.BiasedLockRevocation)) { |
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Integer safepointId = event.getValue("safepointId"); |
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String lockClass = ((RecordedClass)event.getValue("lockClass")).getName(); |
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if (lockClass.equals(MyLock.class.getName())) { |
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Asserts.assertTrue(vmOperationsSingle.contains(safepointId)); |
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revokeCount++; |
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} |
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} else if (event.getEventType().getName().equals(EventNames.BiasedLockClassRevocation)) { |
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Integer safepointId = event.getValue("safepointId"); |
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String lockClass = ((RecordedClass)event.getValue("revokedClass")).getName(); |
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8202095: JFR TestBiasedLockRevocationEvents should cope with multiple events during a single safepoint
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if (lockClass.toString().equals(MyLock.class.getName())) { |
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8202095: JFR TestBiasedLockRevocationEvents should cope with multiple events during a single safepoint
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parents:
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diff
changeset
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Asserts.assertTrue(vmOperationsBulk.contains(safepointId)); |
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8202095: JFR TestBiasedLockRevocationEvents should cope with multiple events during a single safepoint
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parents:
50336
diff
changeset
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310 |
bulkRevokeCount++; |
2bea53d7a27b
8202095: JFR TestBiasedLockRevocationEvents should cope with multiple events during a single safepoint
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parents:
50336
diff
changeset
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} |
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} |
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} |
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Asserts.assertGT(bulkRevokeCount, 0); |
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Asserts.assertGT(revokeCount, bulkRevokeCount); |
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} |
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} |