50113
|
1 |
/*
|
|
2 |
* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
|
|
3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
4 |
*
|
|
5 |
* This code is free software; you can redistribute it and/or modify it
|
|
6 |
* under the terms of the GNU General Public License version 2 only, as
|
|
7 |
* published by the Free Software Foundation. Oracle designates this
|
|
8 |
* particular file as subject to the "Classpath" exception as provided
|
|
9 |
* by Oracle in the LICENSE file that accompanied this code.
|
|
10 |
*
|
|
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
12 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
13 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
14 |
* version 2 for more details (a copy is included in the LICENSE file that
|
|
15 |
* accompanied this code).
|
|
16 |
*
|
|
17 |
* You should have received a copy of the GNU General Public License version
|
|
18 |
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
19 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
20 |
*
|
|
21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
22 |
* or visit www.oracle.com if you need additional information or have any
|
|
23 |
* questions.
|
|
24 |
*/
|
|
25 |
package jdk.jfr.event.oldobject;
|
|
26 |
|
|
27 |
import java.time.Instant;
|
|
28 |
import java.util.List;
|
|
29 |
|
|
30 |
import jdk.jfr.Event;
|
|
31 |
import jdk.jfr.Recording;
|
|
32 |
import jdk.jfr.consumer.RecordedClass;
|
|
33 |
import jdk.jfr.consumer.RecordedClassLoader;
|
|
34 |
import jdk.jfr.consumer.RecordedEvent;
|
|
35 |
import jdk.jfr.consumer.RecordedFrame;
|
|
36 |
import jdk.jfr.consumer.RecordedStackTrace;
|
|
37 |
import jdk.jfr.consumer.RecordedThread;
|
|
38 |
import jdk.jfr.internal.test.WhiteBox;
|
|
39 |
import jdk.test.lib.Asserts;
|
|
40 |
import jdk.test.lib.jfr.EventNames;
|
|
41 |
import jdk.test.lib.jfr.Events;
|
|
42 |
import jdk.test.lib.jfr.TestClassLoader;
|
|
43 |
|
51214
|
44 |
/**
|
50113
|
45 |
* @test
|
|
46 |
* @summary The test verifies that an old object sample maintains references to "stale" metadata
|
51214
|
47 |
* @requires vm.hasJFR
|
50113
|
48 |
* @requires vm.gc == "null"
|
|
49 |
* @key jfr
|
|
50 |
* @modules jdk.jfr/jdk.jfr.internal.test
|
|
51 |
* @library /test/lib /test/jdk
|
|
52 |
* @build jdk.jfr.event.oldobject.TestMetadataObject
|
|
53 |
* @run main/othervm -XX:TLABSize=2k -Xmx16m jdk.jfr.event.oldobject.TestMetadataRetention
|
|
54 |
*/
|
|
55 |
public final class TestMetadataRetention {
|
|
56 |
private final static String TEST_PACKAGE = TestMetadataRetention.class.getPackage().getName();
|
|
57 |
private final static String TEST_CLASS_LOADER_NAME = "JFR TestClassLoader";
|
|
58 |
private final static String TEST_CLASS_NAME = TEST_PACKAGE + ".TestMetadataObject";
|
|
59 |
private final static String ALLOCATOR_THREAD_NAME = "TestAllocationThread";
|
|
60 |
|
|
61 |
public static ClassLoader testClassLoader;
|
|
62 |
public static Object leakObject;
|
|
63 |
public static Thread allocatorThread;
|
|
64 |
public static Class<?> testClass;
|
|
65 |
|
|
66 |
static class ChunkRotation extends Event {
|
|
67 |
}
|
|
68 |
|
|
69 |
public static void main(String[] args) throws Throwable {
|
|
70 |
WhiteBox.setWriteAllObjectSamples(true);
|
|
71 |
while (true) {
|
|
72 |
int failedAttempts = 0;
|
|
73 |
try (Recording recording = new Recording()) {
|
|
74 |
recording.enable(EventNames.OldObjectSample).withStackTrace();
|
|
75 |
recording.enable(EventNames.ClassUnload);
|
|
76 |
recording.start();
|
|
77 |
|
|
78 |
// Setup metadata on the Java heap (class, stack trace and thread)
|
|
79 |
testClassLoader = new TestClassLoader();
|
|
80 |
testClass = testClassLoader.loadClass(TEST_CLASS_NAME);
|
|
81 |
allocatorThread = new Thread(TestMetadataRetention::allocateLeak, ALLOCATOR_THREAD_NAME);
|
|
82 |
allocatorThread.start();
|
|
83 |
allocatorThread.join();
|
|
84 |
|
|
85 |
// Clear out metadata on the heap
|
|
86 |
testClassLoader = null;
|
|
87 |
testClass = null;
|
|
88 |
allocatorThread = null;
|
|
89 |
|
|
90 |
// System.gc() will trigger class unloading if -XX:+ExplicitGCInvokesConcurrent
|
|
91 |
// is NOT set. If this flag is set G1 will never unload classes on System.gc()
|
|
92 |
// and CMS will not guarantee that all semantically dead classes will be
|
|
93 |
// unloaded. As far as the "jfr" key guarantees no VM flags are set from the
|
|
94 |
// outside it should be enough with System.gc().
|
|
95 |
System.gc();
|
|
96 |
|
|
97 |
// Provoke a chunk rotation, which will flush out ordinary metadata.
|
|
98 |
provokeChunkRotation();
|
|
99 |
ChunkRotation cr = new ChunkRotation();
|
|
100 |
cr.commit();
|
|
101 |
recording.stop();
|
|
102 |
|
|
103 |
List<RecordedEvent> events = Events.fromRecording(recording);
|
|
104 |
RecordedEvent chunkRotation = findChunkRotationEvent(events);
|
|
105 |
try {
|
|
106 |
// Sanity check that class was unloaded
|
|
107 |
Events.hasEvent(recording, EventNames.ClassUnload);
|
|
108 |
validateClassUnloadEvent(events);
|
|
109 |
// Validate that metadata for old object event has survived chunk rotation
|
|
110 |
Events.hasEvent(recording, EventNames.OldObjectSample);
|
|
111 |
validateOldObjectEvent(events, chunkRotation.getStartTime());
|
|
112 |
} catch (Throwable t) {
|
|
113 |
t.printStackTrace();
|
|
114 |
System.out.println("Number of failed attempts " + ++failedAttempts);
|
|
115 |
continue;
|
|
116 |
}
|
|
117 |
break;
|
|
118 |
}
|
|
119 |
}
|
|
120 |
}
|
|
121 |
|
|
122 |
private static RecordedEvent findChunkRotationEvent(List<RecordedEvent> events) {
|
|
123 |
for (RecordedEvent e : events) {
|
|
124 |
if (e.getEventType().getName().equals(ChunkRotation.class.getName())) {
|
|
125 |
return e;
|
|
126 |
}
|
|
127 |
}
|
|
128 |
Asserts.fail("Could not find chunk rotation event");
|
|
129 |
return null; // Can't happen;
|
|
130 |
}
|
|
131 |
|
|
132 |
private static void allocateLeak() {
|
|
133 |
try {
|
|
134 |
leakObject = testClass.getMethod("startRecurse").invoke(null);
|
|
135 |
} catch (Exception e) {
|
|
136 |
System.out.println("Could not allocate memory leak!");
|
|
137 |
e.printStackTrace();
|
|
138 |
}
|
|
139 |
}
|
|
140 |
|
|
141 |
private static void provokeChunkRotation() {
|
|
142 |
try (Recording r = new Recording()) {
|
|
143 |
r.start();
|
|
144 |
r.stop();
|
|
145 |
}
|
|
146 |
}
|
|
147 |
|
|
148 |
private static void validateClassUnloadEvent(List<RecordedEvent> events) throws Throwable {
|
|
149 |
for (RecordedEvent event : events) {
|
|
150 |
if (event.getEventType().getName().equals(EventNames.ClassUnload)) {
|
|
151 |
RecordedClass unloadedClass = event.getValue("unloadedClass");
|
|
152 |
if (TEST_CLASS_NAME.equals(unloadedClass.getName())) {
|
|
153 |
RecordedClassLoader definingClassLoader = unloadedClass.getClassLoader();
|
|
154 |
Asserts.assertEquals(TEST_CLASS_LOADER_NAME, definingClassLoader.getName(), "Expected " + TEST_CLASS_LOADER_NAME + ", got " + definingClassLoader.getType().getName());
|
|
155 |
return;
|
|
156 |
}
|
|
157 |
}
|
|
158 |
}
|
|
159 |
}
|
|
160 |
|
|
161 |
private static void validateOldObjectEvent(List<RecordedEvent> events, Instant chunkRotation) throws Throwable {
|
|
162 |
for (RecordedEvent event : events) {
|
|
163 |
if (event.getEventType().getName().equals(EventNames.OldObjectSample)) {
|
|
164 |
// Only check event after the rotation
|
|
165 |
if (!event.getStartTime().isBefore(chunkRotation)) {
|
|
166 |
System.out.println(event);
|
|
167 |
RecordedThread rt = event.getThread();
|
|
168 |
if (rt.getJavaName().equals(ALLOCATOR_THREAD_NAME)) {
|
|
169 |
RecordedStackTrace s = event.getStackTrace();
|
|
170 |
assertStackTrace(s, "startRecurse");
|
|
171 |
assertStackTrace(s, "recurse");
|
|
172 |
return;
|
|
173 |
}
|
|
174 |
}
|
|
175 |
}
|
|
176 |
}
|
|
177 |
|
|
178 |
Asserts.fail("Did not find an old object event with thread " + ALLOCATOR_THREAD_NAME);
|
|
179 |
}
|
|
180 |
|
|
181 |
private static void assertStackTrace(RecordedStackTrace stacktrace, final String methodName) {
|
|
182 |
for (RecordedFrame f : stacktrace.getFrames()) {
|
|
183 |
if (f.getMethod().getName().equals(methodName)) {
|
|
184 |
return;
|
|
185 |
}
|
|
186 |
}
|
|
187 |
Asserts.fail("Could not find class " + methodName + " in stack trace " + stacktrace);
|
|
188 |
}
|
|
189 |
}
|