TestPerfCountersAndMemoryPools.java revision 8359:ed6389f70257 
1/*
2 * Copyright (c) 2013, 2015, 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
24import java.util.List;
25import java.lang.management.*;
26
27import jdk.test.lib.*;
28import static jdk.test.lib.Asserts.*;
29
30/* @test TestPerfCountersAndMemoryPools
31 * @bug 8023476
32 * @library /testlibrary
33 * @requires vm.gc=="Serial" | vm.gc=="null"
34 * @summary Tests that a MemoryPoolMXBeans and PerfCounters for metaspace
35 *          report the same data.
36 * @modules java.base/sun.misc
37 *          java.management
38 *          jdk.jvmstat/sun.jvmstat.monitor
39 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedKlassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint TestPerfCountersAndMemoryPools
40 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint TestPerfCountersAndMemoryPools
41 */
42public class TestPerfCountersAndMemoryPools {
43    public static void main(String[] args) throws Exception {
44        checkMemoryUsage("Metaspace", "sun.gc.metaspace");
45
46        if (InputArguments.contains("-XX:+UseCompressedKlassPointers") && Platform.is64bit()) {
47            checkMemoryUsage("Compressed Class Space", "sun.gc.compressedclassspace");
48        }
49    }
50
51    private static MemoryPoolMXBean getMemoryPool(String memoryPoolName) {
52        List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
53        for (MemoryPoolMXBean pool : pools) {
54            if (pool.getName().equals(memoryPoolName)) {
55                return pool;
56            }
57        }
58
59        throw new RuntimeException("Excpted to find a memory pool with name " +
60                                   memoryPoolName);
61    }
62
63    private static void checkMemoryUsage(String memoryPoolName, String perfNS)
64        throws Exception {
65        MemoryPoolMXBean pool = getMemoryPool(memoryPoolName);
66
67        // Must do a GC to update performance counters
68        System.gc();
69        assertEQ(getMinCapacity(perfNS), pool.getUsage().getInit());
70
71        // Must do a second GC to update the perfomance counters again, since
72        // the call pool.getUsage().getInit() could have allocated some
73        // metadata.
74        System.gc();
75        assertEQ(getUsed(perfNS), pool.getUsage().getUsed());
76        assertEQ(getCapacity(perfNS), pool.getUsage().getCommitted());
77    }
78
79    private static long getMinCapacity(String ns) throws Exception {
80        return PerfCounters.findByName(ns + ".minCapacity").longValue();
81    }
82
83    private static long getCapacity(String ns) throws Exception {
84        return PerfCounters.findByName(ns + ".capacity").longValue();
85    }
86
87    private static long getUsed(String ns) throws Exception {
88        return PerfCounters.findByName(ns + ".used").longValue();
89    }
90}
91