1 /*
2  * Copyright (c) 2014, 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.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
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22  */
23 
24 /*
25  * @test
26  * @key gc
27  * @bug 8049831
28  * @requires !vm.graal.enabled
29  * @library /test/lib
30  * @modules java.base/jdk.internal.misc
31  *          java.management
32  * @build sun.hotspot.WhiteBox
33  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
34  *                              sun.hotspot.WhiteBox$WhiteBoxPermission
35  * @run driver TestCMSClassUnloadingEnabledHWM
36  * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.
37  */
38 
39 import jdk.test.lib.process.OutputAnalyzer;
40 import jdk.test.lib.process.ProcessTools;
41 import java.lang.management.GarbageCollectorMXBean;
42 import java.lang.management.ManagementFactory;
43 import java.util.ArrayList;
44 import java.util.Arrays;
45 import sun.hotspot.WhiteBox;
46 
47 public class TestCMSClassUnloadingEnabledHWM {
48   private static long MetaspaceSize = 32 * 1024 * 1024;
49   private static long YoungGenSize  = 32 * 1024 * 1024;
50 
run(boolean enableUnloading)51   private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
52     ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
53       "-Xbootclasspath/a:.",
54       "-XX:+UnlockDiagnosticVMOptions",
55       "-XX:+WhiteBoxAPI",
56       "-Xmx128m",
57       "-XX:CMSMaxAbortablePrecleanTime=1",
58       "-XX:CMSWaitDuration=50",
59       "-XX:MetaspaceSize=" + MetaspaceSize,
60       "-Xmn" + YoungGenSize,
61       "-XX:+UseConcMarkSweepGC",
62       "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled",
63       "-Xlog:gc",
64       TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(),
65       "" + MetaspaceSize);
66     return new OutputAnalyzer(pb.start());
67   }
68 
runWithCMSClassUnloading()69   public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {
70     return run(true);
71   }
72 
runWithoutCMSClassUnloading()73   public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {
74     return run(false);
75   }
76 
testWithoutCMSClassUnloading()77   public static void testWithoutCMSClassUnloading() throws Exception {
78     // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.
79     OutputAnalyzer out = runWithoutCMSClassUnloading();
80 
81     out.shouldMatch(".*Pause Full.*");
82     out.shouldNotMatch(".*Pause Initial Mark.*");
83   }
84 
testWithCMSClassUnloading()85   public static void testWithCMSClassUnloading() throws Exception {
86     // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.
87     OutputAnalyzer out = runWithCMSClassUnloading();
88 
89     out.shouldMatch(".*Pause Initial Mark.*");
90     out.shouldNotMatch(".*Pause Full.*");
91   }
92 
main(String args[])93   public static void main(String args[]) throws Exception {
94     testWithCMSClassUnloading();
95     testWithoutCMSClassUnloading();
96   }
97 
98   public static class AllocateBeyondMetaspaceSize {
main(String [] args)99     public static void main(String [] args) throws Exception {
100       if (args.length != 1) {
101         throw new IllegalArgumentException("Usage: <MetaspaceSize>");
102       }
103 
104       WhiteBox wb = WhiteBox.getWhiteBox();
105 
106       // Allocate past the MetaspaceSize limit.
107       long metaspaceSize = Long.parseLong(args[0]);
108       long allocationBeyondMetaspaceSize  = metaspaceSize * 2;
109       long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);
110 
111       // Wait for at least one GC to occur. The caller will parse the log files produced.
112       GarbageCollectorMXBean cmsGCBean = getCMSGCBean();
113       while (cmsGCBean.getCollectionCount() == 0) {
114         Thread.sleep(100);
115       }
116 
117       wb.freeMetaspace(null, metaspace, metaspace);
118     }
119 
getCMSGCBean()120     private static GarbageCollectorMXBean getCMSGCBean() {
121       for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) {
122         if (gcBean.getObjectName().toString().equals("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep")) {
123           return gcBean;
124         }
125       }
126       return null;
127     }
128   }
129 }
130 
131