1 /*
   2  * Copyright (c) 2013, 2014, 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 com.oracle.java.testlibrary.*;
  28 import static com.oracle.java.testlibrary.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  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedClassPointers -XX:+UseSerialGC -XX:+UsePerfData TestPerfCountersAndMemoryPools
  37  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:+UseSerialGC -XX:+UsePerfData TestPerfCountersAndMemoryPools
  38  */
  39 public class TestPerfCountersAndMemoryPools {
  40     public static void main(String[] args) throws Exception {
  41         checkMemoryUsage("Metaspace", "sun.gc.metaspace");
  42 
  43         if (InputArguments.contains("-XX:+UseCompressedKlassPointers") && Platform.is64bit()) {
  44             checkMemoryUsage("Compressed Class Space", "sun.gc.compressedclassspace");
  45         }
  46     }
  47 
  48     private static MemoryPoolMXBean getMemoryPool(String memoryPoolName) {
  49         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
  50         for (MemoryPoolMXBean pool : pools) {
  51             if (pool.getName().equals(memoryPoolName)) {
  52                 return pool;
  53             }
  54         }
  55 
  56         throw new RuntimeException("Excpted to find a memory pool with name " +
  57                                    memoryPoolName);
  58     }
  59 
  60     private static void checkMemoryUsage(String memoryPoolName, String perfNS)
  61         throws Exception {
  62         MemoryPoolMXBean pool = getMemoryPool(memoryPoolName);
  63 
  64         // Must do a GC to update performance counters
  65         System.gc();
  66         assertEQ(getMinCapacity(perfNS), pool.getUsage().getInit());
  67 
  68         // Must do a second GC to update the perfomance counters again, since
  69         // the call pool.getUsage().getInit() could have allocated some
  70         // metadata.
  71         System.gc();
  72         assertEQ(getUsed(perfNS), pool.getUsage().getUsed());
  73         assertEQ(getCapacity(perfNS), pool.getUsage().getCommitted());
  74     }
  75 
  76     private static long getMinCapacity(String ns) throws Exception {
  77         return PerfCounters.findByName(ns + ".minCapacity").longValue();
  78     }
  79 
  80     private static long getCapacity(String ns) throws Exception {
  81         return PerfCounters.findByName(ns + ".capacity").longValue();
  82     }
  83 
  84     private static long getUsed(String ns) throws Exception {
  85         return PerfCounters.findByName(ns + ".used").longValue();
  86     }
  87 }