1/*
2 * Copyright (c) 2014, 2016, 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
16 * 2 along with this work; if not, write to the Free Software Foundation,
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
21 * questions.
22 */
23
24/*
25 * @test
26 * @key gc
27 * @bug 8049831
28 * @library /test/lib
29 * @modules java.base/jdk.internal.misc
30 *          java.management
31 * @build sun.hotspot.WhiteBox
32 * @run main ClassFileInstaller sun.hotspot.WhiteBox
33 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
34 * @run driver TestCMSClassUnloadingEnabledHWM
35 * @summary Test that -XX:-CMSClassUnloadingEnabled will trigger a Full GC when more than MetaspaceSize metadata is allocated.
36 */
37
38import jdk.test.lib.process.OutputAnalyzer;
39import jdk.test.lib.process.ProcessTools;
40import java.lang.management.GarbageCollectorMXBean;
41import java.lang.management.ManagementFactory;
42import java.util.ArrayList;
43import java.util.Arrays;
44import sun.hotspot.WhiteBox;
45
46public class TestCMSClassUnloadingEnabledHWM {
47  private static long MetaspaceSize = 32 * 1024 * 1024;
48  private static long YoungGenSize  = 32 * 1024 * 1024;
49
50  private static OutputAnalyzer run(boolean enableUnloading) throws Exception {
51    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
52      "-Xbootclasspath/a:.",
53      "-XX:+UnlockDiagnosticVMOptions",
54      "-XX:+WhiteBoxAPI",
55      "-Xmx128m",
56      "-XX:CMSMaxAbortablePrecleanTime=1",
57      "-XX:CMSWaitDuration=50",
58      "-XX:MetaspaceSize=" + MetaspaceSize,
59      "-Xmn" + YoungGenSize,
60      "-XX:+UseConcMarkSweepGC",
61      "-XX:" + (enableUnloading ? "+" : "-") + "CMSClassUnloadingEnabled",
62      "-Xlog:gc",
63      TestCMSClassUnloadingEnabledHWM.AllocateBeyondMetaspaceSize.class.getName(),
64      "" + MetaspaceSize);
65    return new OutputAnalyzer(pb.start());
66  }
67
68  public static OutputAnalyzer runWithCMSClassUnloading() throws Exception {
69    return run(true);
70  }
71
72  public static OutputAnalyzer runWithoutCMSClassUnloading() throws Exception {
73    return run(false);
74  }
75
76  public static void testWithoutCMSClassUnloading() throws Exception {
77    // -XX:-CMSClassUnloadingEnabled is used, so we expect a full GC instead of a concurrent cycle.
78    OutputAnalyzer out = runWithoutCMSClassUnloading();
79
80    out.shouldMatch(".*Pause Full.*");
81    out.shouldNotMatch(".*Pause Initial Mark.*");
82  }
83
84  public static void testWithCMSClassUnloading() throws Exception {
85    // -XX:+CMSClassUnloadingEnabled is used, so we expect a concurrent cycle instead of a full GC.
86    OutputAnalyzer out = runWithCMSClassUnloading();
87
88    out.shouldMatch(".*Pause Initial Mark.*");
89    out.shouldNotMatch(".*Pause Full.*");
90  }
91
92  public static void main(String args[]) throws Exception {
93    testWithCMSClassUnloading();
94    testWithoutCMSClassUnloading();
95  }
96
97  public static class AllocateBeyondMetaspaceSize {
98    public static void main(String [] args) throws Exception {
99      if (args.length != 1) {
100        throw new IllegalArgumentException("Usage: <MetaspaceSize>");
101      }
102
103      WhiteBox wb = WhiteBox.getWhiteBox();
104
105      // Allocate past the MetaspaceSize limit.
106      long metaspaceSize = Long.parseLong(args[0]);
107      long allocationBeyondMetaspaceSize  = metaspaceSize * 2;
108      long metaspace = wb.allocateMetaspace(null, allocationBeyondMetaspaceSize);
109
110      // Wait for at least one GC to occur. The caller will parse the log files produced.
111      GarbageCollectorMXBean cmsGCBean = getCMSGCBean();
112      while (cmsGCBean.getCollectionCount() == 0) {
113        Thread.sleep(100);
114      }
115
116      wb.freeMetaspace(null, metaspace, metaspace);
117    }
118
119    private static GarbageCollectorMXBean getCMSGCBean() {
120      for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) {
121        if (gcBean.getObjectName().toString().equals("java.lang:type=GarbageCollector,name=ConcurrentMarkSweep")) {
122          return gcBean;
123        }
124      }
125      return null;
126    }
127  }
128}
129
130