1 /*

     2  * Copyright (c) 2013, 2017, 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 import java.util.List;

    25 import java.lang.management.*;

    26 

    27 import jdk.test.lib.Platform;

    28 import static jdk.test.lib.Asserts.*;

    29 

    30 /* @test TestPerfCountersAndMemoryPools

    31  * @bug 8023476

    32  * @library /test/lib

    33  * @requires vm.gc.Serial

    34  * @summary Tests that a MemoryPoolMXBeans and PerfCounters for metaspace

    35  *          report the same data.

    36  * @modules java.base/jdk.internal.misc

    37  *          java.management

    38  *          jdk.internal.jvmstat/sun.jvmstat.monitor

    39  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedClassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint TestPerfCountersAndMemoryPools

    40  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint TestPerfCountersAndMemoryPools

    41  */

    42 public class TestPerfCountersAndMemoryPools {

    43     public static void main(String[] args) throws Exception {

    44         checkMemoryUsage("Metaspace", "sun.gc.metaspace");

    45 

    46         if (InputArguments.contains("-XX:+UseCompressedClassPointers") && 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         // First, call all the methods to let them allocate their own slab of metadata

    68         getMinCapacity(perfNS);

    69         getCapacity(perfNS);

    70         getUsed(perfNS);

    71         pool.getUsage().getInit();

    72         pool.getUsage().getUsed();

    73         pool.getUsage().getCommitted();

    74         assertEQ(1L, 1L, "Make assert load");

    75 

    76         // Must do a GC to update performance counters

    77         System.gc();

    78         assertEQ(getMinCapacity(perfNS), pool.getUsage().getInit(), "MinCapacity out of sync");

    79 

    80         // Adding a second GC due to metadata allocations caused by getting the

    81         // initial size from the pool. This is needed when running with -Xcomp.

    82         System.gc();

    83         assertEQ(getUsed(perfNS), pool.getUsage().getUsed(), "Used out of sync");

    84         assertEQ(getCapacity(perfNS), pool.getUsage().getCommitted(), "Committed out of sync");

    85     }

    86 

    87     private static long getMinCapacity(String ns) throws Exception {

    88         return PerfCounters.findByName(ns + ".minCapacity").longValue();

    89     }

    90 

    91     private static long getCapacity(String ns) throws Exception {

    92         return PerfCounters.findByName(ns + ".capacity").longValue();

    93     }

    94 

    95     private static long getUsed(String ns) throws Exception {

    96         return PerfCounters.findByName(ns + ".used").longValue();

    97     }

    98 }