| /* |
| * 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.oldobject; |
| |
| import java.time.Instant; |
| import java.util.List; |
| |
| import jdk.jfr.Event; |
| import jdk.jfr.Recording; |
| import jdk.jfr.consumer.RecordedClass; |
| import jdk.jfr.consumer.RecordedClassLoader; |
| import jdk.jfr.consumer.RecordedEvent; |
| import jdk.jfr.consumer.RecordedFrame; |
| import jdk.jfr.consumer.RecordedStackTrace; |
| import jdk.jfr.consumer.RecordedThread; |
| import jdk.jfr.internal.test.WhiteBox; |
| import jdk.test.lib.Asserts; |
| import jdk.test.lib.jfr.EventNames; |
| import jdk.test.lib.jfr.Events; |
| import jdk.test.lib.jfr.TestClassLoader; |
| |
| /* |
| * @test |
| * @summary The test verifies that an old object sample maintains references to "stale" metadata |
| * @requires vm.gc == "null" |
| * @key jfr |
| * @modules jdk.jfr/jdk.jfr.internal.test |
| * @library /test/lib /test/jdk |
| * @build jdk.jfr.event.oldobject.TestMetadataObject |
| * @run main/othervm -XX:TLABSize=2k -Xmx16m jdk.jfr.event.oldobject.TestMetadataRetention |
| */ |
| public final class TestMetadataRetention { |
| private final static String TEST_PACKAGE = TestMetadataRetention.class.getPackage().getName(); |
| private final static String TEST_CLASS_LOADER_NAME = "JFR TestClassLoader"; |
| private final static String TEST_CLASS_NAME = TEST_PACKAGE + ".TestMetadataObject"; |
| private final static String ALLOCATOR_THREAD_NAME = "TestAllocationThread"; |
| |
| public static ClassLoader testClassLoader; |
| public static Object leakObject; |
| public static Thread allocatorThread; |
| public static Class<?> testClass; |
| |
| static class ChunkRotation extends Event { |
| } |
| |
| public static void main(String[] args) throws Throwable { |
| WhiteBox.setWriteAllObjectSamples(true); |
| while (true) { |
| int failedAttempts = 0; |
| try (Recording recording = new Recording()) { |
| recording.enable(EventNames.OldObjectSample).withStackTrace(); |
| recording.enable(EventNames.ClassUnload); |
| recording.start(); |
| |
| // Setup metadata on the Java heap (class, stack trace and thread) |
| testClassLoader = new TestClassLoader(); |
| testClass = testClassLoader.loadClass(TEST_CLASS_NAME); |
| allocatorThread = new Thread(TestMetadataRetention::allocateLeak, ALLOCATOR_THREAD_NAME); |
| allocatorThread.start(); |
| allocatorThread.join(); |
| |
| // Clear out metadata on the heap |
| testClassLoader = null; |
| testClass = null; |
| allocatorThread = null; |
| |
| // System.gc() will trigger class unloading if -XX:+ExplicitGCInvokesConcurrent |
| // is NOT set. If this flag is set G1 will never unload classes on System.gc() |
| // and CMS will not guarantee that all semantically dead classes will be |
| // unloaded. As far as the "jfr" key guarantees no VM flags are set from the |
| // outside it should be enough with System.gc(). |
| System.gc(); |
| |
| // Provoke a chunk rotation, which will flush out ordinary metadata. |
| provokeChunkRotation(); |
| ChunkRotation cr = new ChunkRotation(); |
| cr.commit(); |
| recording.stop(); |
| |
| List<RecordedEvent> events = Events.fromRecording(recording); |
| RecordedEvent chunkRotation = findChunkRotationEvent(events); |
| try { |
| // Sanity check that class was unloaded |
| Events.hasEvent(recording, EventNames.ClassUnload); |
| validateClassUnloadEvent(events); |
| // Validate that metadata for old object event has survived chunk rotation |
| Events.hasEvent(recording, EventNames.OldObjectSample); |
| validateOldObjectEvent(events, chunkRotation.getStartTime()); |
| } catch (Throwable t) { |
| t.printStackTrace(); |
| System.out.println("Number of failed attempts " + ++failedAttempts); |
| continue; |
| } |
| break; |
| } |
| } |
| } |
| |
| private static RecordedEvent findChunkRotationEvent(List<RecordedEvent> events) { |
| for (RecordedEvent e : events) { |
| if (e.getEventType().getName().equals(ChunkRotation.class.getName())) { |
| return e; |
| } |
| } |
| Asserts.fail("Could not find chunk rotation event"); |
| return null; // Can't happen; |
| } |
| |
| private static void allocateLeak() { |
| try { |
| leakObject = testClass.getMethod("startRecurse").invoke(null); |
| } catch (Exception e) { |
| System.out.println("Could not allocate memory leak!"); |
| e.printStackTrace(); |
| } |
| } |
| |
| private static void provokeChunkRotation() { |
| try (Recording r = new Recording()) { |
| r.start(); |
| r.stop(); |
| } |
| } |
| |
| private static void validateClassUnloadEvent(List<RecordedEvent> events) throws Throwable { |
| for (RecordedEvent event : events) { |
| if (event.getEventType().getName().equals(EventNames.ClassUnload)) { |
| RecordedClass unloadedClass = event.getValue("unloadedClass"); |
| if (TEST_CLASS_NAME.equals(unloadedClass.getName())) { |
| RecordedClassLoader definingClassLoader = unloadedClass.getClassLoader(); |
| Asserts.assertEquals(TEST_CLASS_LOADER_NAME, definingClassLoader.getName(), "Expected " + TEST_CLASS_LOADER_NAME + ", got " + definingClassLoader.getType().getName()); |
| return; |
| } |
| } |
| } |
| } |
| |
| private static void validateOldObjectEvent(List<RecordedEvent> events, Instant chunkRotation) throws Throwable { |
| for (RecordedEvent event : events) { |
| if (event.getEventType().getName().equals(EventNames.OldObjectSample)) { |
| // Only check event after the rotation |
| if (!event.getStartTime().isBefore(chunkRotation)) { |
| System.out.println(event); |
| RecordedThread rt = event.getThread(); |
| if (rt.getJavaName().equals(ALLOCATOR_THREAD_NAME)) { |
| RecordedStackTrace s = event.getStackTrace(); |
| assertStackTrace(s, "startRecurse"); |
| assertStackTrace(s, "recurse"); |
| return; |
| } |
| } |
| } |
| } |
| |
| Asserts.fail("Did not find an old object event with thread " + ALLOCATOR_THREAD_NAME); |
| } |
| |
| private static void assertStackTrace(RecordedStackTrace stacktrace, final String methodName) { |
| for (RecordedFrame f : stacktrace.getFrames()) { |
| if (f.getMethod().getName().equals(methodName)) { |
| return; |
| } |
| } |
| Asserts.fail("Could not find class " + methodName + " in stack trace " + stacktrace); |
| } |
| } |