1 /*
   2  * Copyright (c) 2013, 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.ManagementFactory;
  26 import java.lang.management.MemoryManagerMXBean;
  27 import java.lang.management.MemoryPoolMXBean;
  28 import java.lang.management.MemoryUsage;
  29 
  30 import java.lang.management.RuntimeMXBean;
  31 import java.lang.management.ManagementFactory;
  32 
  33 /* @test TestMetaspaceMemoryPool
  34  * @bug 8000754
  35  * @summary Tests that a MemoryPoolMXBeans is created for metaspace and that a
  36  *          MemoryManagerMXBean is created.
  37  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops TestMetaspaceMemoryPool
  38  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:MaxMetaspaceSize=60m TestMetaspaceMemoryPool
  39  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers TestMetaspaceMemoryPool
  40  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers -XX:ClassMetaspaceSize=60m TestMetaspaceMemoryPool
  41  */
  42 public class TestMetaspaceMemoryPool {
  43     public static void main(String[] args) {
  44         verifyThatMetaspaceMemoryManagerExists();
  45         verifyMemoryPool(getMemoryPool("Metaspace"), isFlagDefined("MaxMetaspaceSize"));
  46 
  47         if (runsOn64bit()) {
  48             MemoryPoolMXBean cksPool = getMemoryPool("Compressed Klass Space");
  49             if (usesCompressedOops()) {
  50                 verifyMemoryPool(cksPool, true);
  51             } else {
  52                 verifyEmptyMemoryPool(cksPool);
  53             }
  54         }
  55     }
  56 
  57     private static boolean runsOn64bit() {
  58         return !System.getProperty("sun.arch.data.model").equals("32");
  59     }
  60 
  61     private static boolean usesCompressedOops() {
  62         return isFlagDefined("+UseCompressedOops");
  63     }
  64 
  65     private static boolean isFlagDefined(String name) {
  66         RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
  67         List<String> args = runtimeMxBean.getInputArguments();
  68         for (String arg : args) {
  69             if (arg.startsWith("-XX:" + name)) {
  70                 return true;
  71             }
  72         }
  73         return false;
  74     }
  75 
  76     private static void verifyThatMetaspaceMemoryManagerExists() {
  77         List<MemoryManagerMXBean> managers = ManagementFactory.getMemoryManagerMXBeans();
  78         for (MemoryManagerMXBean manager : managers) {
  79             if (manager.getName().equals("Metaspace Manager")) {
  80                 return;
  81             }
  82         }
  83 
  84         throw new RuntimeException("Expected to find a metaspace memory manager");
  85     }
  86 
  87     private static MemoryPoolMXBean getMemoryPool(String name) {
  88         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
  89         for (MemoryPoolMXBean pool : pools) {
  90             if (pool.getName().equals(name)) {
  91                 return pool;
  92             }
  93         }
  94 
  95         throw new RuntimeException("Expected to find a memory pool with name " + name);
  96     }
  97 
  98     private static void verifyMemoryPool(MemoryPoolMXBean pool, boolean isMaxDefined) {
  99         MemoryUsage mu = pool.getUsage();
 100         assertDefined(mu.getInit(), "init");
 101         assertDefined(mu.getUsed(), "used");
 102         assertDefined(mu.getCommitted(), "committed");
 103 
 104         if (isMaxDefined) {
 105             assertDefined(mu.getMax(), "max");
 106         } else {
 107             assertUndefined(mu.getMax(), "max");
 108         }
 109     }
 110 
 111     private static void verifyEmptyMemoryPool(MemoryPoolMXBean pool) {
 112         MemoryUsage mu = pool.getUsage();
 113         assertUndefined(mu.getInit(), "init");
 114         assertUndefined(mu.getMax(), "max");
 115 
 116         assertEquals(mu.getUsed(), 0, "Expected used to be 0");
 117         assertEquals(mu.getCommitted(), 0, "Expected committed to be 0");
 118     }
 119 
 120 
 121     private static void assertDefined(long value, String name) {
 122         assertTrue(value != -1, "Expected " + name + " to be defined");
 123     }
 124 
 125     private static void assertUndefined(long value, String name) {
 126         assertEquals(value, -1, "Expected " + name + " to be undefined");
 127     }
 128 
 129     private static void assertEquals(long actual, long expected, String msg) {
 130         assertTrue(actual == expected, msg);
 131     }
 132 
 133     private static void assertTrue(boolean condition, String msg) {
 134         if (!condition) {
 135             throw new RuntimeException(msg);
 136         }
 137     }
 138 }