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 
  24 import java.util.List;
  25 import java.lang.management.*;
  26 
  27 import jdk.test.lib.*;
  28 import 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:-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 caused by getting
  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 }