| /* |
| * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.jfr.event.runtime; |
| |
| import jdk.jfr.Recording; |
| import jdk.jfr.consumer.*; |
| import jdk.test.lib.Asserts; |
| import jdk.test.lib.dcmd.PidJcmdExecutor; |
| import jdk.test.lib.jfr.EventNames; |
| import jdk.test.lib.jfr.Events; |
| import jdk.test.lib.process.OutputAnalyzer; |
| |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.concurrent.FutureTask; |
| |
| /* |
| * @test |
| * @key jfr |
| * @library /test/lib |
| * |
| * @run main/othervm jdk.jfr.event.runtime.TestBiasedLockRevocationEvents |
| */ |
| public class TestBiasedLockRevocationEvents { |
| |
| public static void main(String[] args) throws Throwable { |
| testSingleRevocation(); |
| testBulkRevocation(); |
| testSelfRevocation(); |
| testExitedThreadRevocation(); |
| testBulkRevocationNoRebias(); |
| testRevocationSafepointIdCorrelation(); |
| } |
| |
| // Default value of BiasedLockingBulkRebiasThreshold is 20, and BiasedLockingBulkRevokeTreshold is 40. |
| // Using a value that will hit the first threshold once, and the second one the next time. |
| private static final int BULK_REVOKE_THRESHOLD = 25; |
| |
| static void touch(Object lock) { |
| synchronized(lock) { |
| } |
| } |
| |
| static Thread triggerRevocation(int numRevokes, Class<?> lockClass) throws Throwable { |
| Object[] locks = new Object[numRevokes]; |
| for (int i = 0; i < locks.length; ++i) { |
| locks[i] = lockClass.getDeclaredConstructor().newInstance(); |
| touch(locks[i]); |
| } |
| |
| Thread biasBreaker = new Thread("BiasBreaker") { |
| @Override |
| public void run() { |
| for (Object lock : locks) { |
| touch(lock); |
| } |
| } |
| }; |
| |
| biasBreaker.start(); |
| biasBreaker.join(); |
| |
| return biasBreaker; |
| } |
| |
| // Basic stack trace validation, checking the name of the leaf method |
| static void validateStackTrace(RecordedStackTrace stackTrace, String leafMethodName) { |
| List<RecordedFrame> frames = stackTrace.getFrames(); |
| Asserts.assertFalse(frames.isEmpty()); |
| String name = frames.get(0).getMethod().getName(); |
| Asserts.assertEquals(name, leafMethodName); |
| } |
| |
| // Validates that the given stack trace refers to lock.touch(); in triggerRevocation |
| static void validateStackTrace(RecordedStackTrace stackTrace) { |
| validateStackTrace(stackTrace, "touch"); |
| } |
| |
| static void testSingleRevocation() throws Throwable { |
| class MyLock {}; |
| |
| Recording recording = new Recording(); |
| |
| recording.enable(EventNames.BiasedLockRevocation); |
| recording.start(); |
| |
| Thread biasBreaker = triggerRevocation(1, MyLock.class); |
| |
| recording.stop(); |
| |
| List<RecordedEvent> events = Events.fromRecording(recording); |
| |
| // We may or may not catch a second revocation from the biasBreaker thread exiting |
| Asserts.assertGreaterThanOrEqual(events.size(), 1); |
| |
| RecordedEvent event = events.get(0); |
| Events.assertEventThread(event, biasBreaker); |
| Events.assertEventThread(event, "previousOwner", Thread.currentThread()); |
| |
| RecordedClass lockClass = event.getValue("lockClass"); |
| Asserts.assertEquals(lockClass.getName(), MyLock.class.getName()); |
| |
| validateStackTrace(event.getStackTrace()); |
| } |
| |
| static void testBulkRevocation() throws Throwable { |
| class MyLock {}; |
| |
| Recording recording = new Recording(); |
| |
| recording.enable(EventNames.BiasedLockClassRevocation); |
| recording.start(); |
| |
| Thread biasBreaker = triggerRevocation(BULK_REVOKE_THRESHOLD, MyLock.class); |
| |
| recording.stop(); |
| List<RecordedEvent> events = Events.fromRecording(recording); |
| Asserts.assertEQ(events.size(), 1); |
| |
| RecordedEvent event = events.get(0); |
| Events.assertEventThread(event, biasBreaker); |
| Events.assertField(event, "disableBiasing").equal(false); |
| |
| RecordedClass lockClass = event.getValue("revokedClass"); |
| Asserts.assertEquals(lockClass.getName(), MyLock.class.getName()); |
| |
| validateStackTrace(event.getStackTrace()); |
| } |
| |
| static void testSelfRevocation() throws Throwable { |
| class MyLock {}; |
| |
| Recording recording = new Recording(); |
| |
| recording.enable(EventNames.BiasedLockSelfRevocation); |
| recording.start(); |
| |
| MyLock l = new MyLock(); |
| touch(l); |
| Thread.holdsLock(l); |
| |
| recording.stop(); |
| |
| List<RecordedEvent> events = Events.fromRecording(recording); |
| Asserts.assertEQ(events.size(), 1); |
| |
| RecordedEvent event = events.get(0); |
| Events.assertEventThread(event, Thread.currentThread()); |
| |
| validateStackTrace(event.getStackTrace(), "holdsLock"); |
| } |
| |
| static void testExitedThreadRevocation() throws Throwable { |
| class MyLock {}; |
| |
| Recording recording = new Recording(); |
| |
| recording.enable(EventNames.BiasedLockRevocation); |
| recording.start(); |
| |
| FutureTask<MyLock> lockerTask = new FutureTask<>(() -> { |
| MyLock l = new MyLock(); |
| touch(l); |
| return l; |
| }); |
| |
| Thread locker = new Thread(lockerTask, "BiasLocker"); |
| locker.start(); |
| locker.join(); |
| |
| // Even after joining, the VM has a bit more work to do before the thread is actually removed |
| // from the threads list. Ensure that this has happened before proceeding. |
| while (true) { |
| PidJcmdExecutor jcmd = new PidJcmdExecutor(); |
| OutputAnalyzer oa = jcmd.execute("Thread.print", true); |
| String lockerThreadFound = oa.firstMatch("BiasLocker"); |
| if (lockerThreadFound == null) { |
| break; |
| } |
| }; |
| |
| MyLock l = lockerTask.get(); |
| touch(l); |
| |
| recording.stop(); |
| List<RecordedEvent> events = Events.fromRecording(recording); |
| Events.hasEvents(events); |
| |
| // Joining the locker thread can cause revocations as well, search for the interesting one |
| for (RecordedEvent event : events) { |
| RecordedClass lockClass = event.getValue("lockClass"); |
| if (lockClass.getName().equals(MyLock.class.getName())) { |
| Events.assertEventThread(event, Thread.currentThread()); |
| // Previous owner will usually be null, but can also be a thread that |
| // was created after the BiasLocker thread exited due to address reuse. |
| RecordedThread prevOwner = event.getValue("previousOwner"); |
| if (prevOwner != null) { |
| Asserts.assertNE(prevOwner.getJavaName(), "BiasLocker"); |
| } |
| validateStackTrace(event.getStackTrace()); |
| return; |
| } |
| } |
| Asserts.fail("Did not find any revocation event for MyLock"); |
| } |
| |
| static void testBulkRevocationNoRebias() throws Throwable { |
| class MyLock {}; |
| |
| Recording recording = new Recording(); |
| |
| recording.enable(EventNames.BiasedLockClassRevocation); |
| recording.start(); |
| |
| Thread biasBreaker0 = triggerRevocation(BULK_REVOKE_THRESHOLD, MyLock.class); |
| Thread biasBreaker1 = triggerRevocation(BULK_REVOKE_THRESHOLD, MyLock.class); |
| |
| recording.stop(); |
| List<RecordedEvent> events = Events.fromRecording(recording); |
| Asserts.assertEQ(events.size(), 2); |
| |
| // The rebias event should occur before the noRebias one |
| RecordedEvent eventRebias = events.get(0).getStartTime().isBefore(events.get(1).getStartTime()) ? events.get(0) : events.get(1); |
| RecordedEvent eventNoRebias = events.get(0).getStartTime().isBefore(events.get(1).getStartTime()) ? events.get(1) : events.get(0); |
| |
| Events.assertEventThread(eventRebias, biasBreaker0); |
| Events.assertField(eventRebias, "disableBiasing").equal(false); |
| |
| Events.assertEventThread(eventNoRebias, biasBreaker1); |
| Events.assertField(eventNoRebias, "disableBiasing").equal(true); |
| |
| RecordedClass lockClassRebias = eventRebias.getValue("revokedClass"); |
| Asserts.assertEquals(lockClassRebias.getName(), MyLock.class.getName()); |
| RecordedClass lockClassNoRebias = eventNoRebias.getValue("revokedClass"); |
| Asserts.assertEquals(lockClassNoRebias.getName(), MyLock.class.getName()); |
| |
| validateStackTrace(eventRebias.getStackTrace()); |
| validateStackTrace(eventNoRebias.getStackTrace()); |
| } |
| |
| static void testRevocationSafepointIdCorrelation() throws Throwable { |
| class MyLock {}; |
| |
| Recording recording = new Recording(); |
| |
| recording.enable(EventNames.BiasedLockRevocation); |
| recording.enable(EventNames.BiasedLockClassRevocation); |
| recording.enable(EventNames.ExecuteVMOperation); |
| recording.start(); |
| |
| triggerRevocation(BULK_REVOKE_THRESHOLD, MyLock.class); |
| |
| recording.stop(); |
| List<RecordedEvent> events = Events.fromRecording(recording); |
| |
| // Find all biased locking related VMOperation events |
| HashMap<Integer, RecordedEvent> vmOperations = new HashMap<Integer, RecordedEvent>(); |
| for (RecordedEvent event : events) { |
| if ((event.getEventType().getName().equals(EventNames.ExecuteVMOperation)) && |
| (event.getValue("operation").toString().contains("Bias"))) { |
| vmOperations.put(event.getValue("safepointId"), event); |
| } |
| } |
| |
| int revokeCount = 0; |
| int bulkRevokeCount = 0; |
| |
| // Match all revoke events to a corresponding VMOperation event |
| for (RecordedEvent event : events) { |
| if (event.getEventType().getName().equals(EventNames.BiasedLockRevocation)) { |
| RecordedEvent vmOpEvent = vmOperations.remove(event.getValue("safepointId")); |
| if (event.getValue("safepointId").toString().equals("-1")) { |
| Asserts.assertEquals(vmOpEvent, null); |
| } else { |
| Events.assertField(vmOpEvent, "operation").equal("RevokeBias"); |
| revokeCount++; |
| } |
| } else if (event.getEventType().getName().equals(EventNames.BiasedLockClassRevocation)) { |
| RecordedEvent vmOpEvent = vmOperations.remove(event.getValue("safepointId")); |
| Events.assertField(vmOpEvent, "operation").equal("BulkRevokeBias"); |
| bulkRevokeCount++; |
| } |
| } |
| |
| // All VMOperations should have had a matching revoke event |
| Asserts.assertEQ(vmOperations.size(), 0); |
| |
| Asserts.assertGT(bulkRevokeCount, 0); |
| Asserts.assertGT(revokeCount, bulkRevokeCount); |
| } |
| } |