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 import jdk.test.lib.*;
  27 import static jdk.test.lib.Asserts.*;
  28 
  29 /* @test TestMetaspaceMemoryPool
  30  * @bug 8000754
  31  * @summary Tests that a MemoryPoolMXBeans is created for metaspace and that a
  32  *          MemoryManagerMXBean is created.
  33  * @library /testlibrary
  34  * @modules java.base/jdk.internal.misc
  35  *          java.management
  36  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops TestMetaspaceMemoryPool
  37  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:MaxMetaspaceSize=60m TestMetaspaceMemoryPool
  38  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers TestMetaspaceMemoryPool
  39  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:CompressedClassSpaceSize=60m TestMetaspaceMemoryPool
  40  */
  41 public class TestMetaspaceMemoryPool {
  42     public static void main(String[] args) {
  43         verifyThatMetaspaceMemoryManagerExists();
  44 
  45         boolean isMetaspaceMaxDefined = InputArguments.containsPrefix("-XX:MaxMetaspaceSize");
  46         verifyMemoryPool(getMemoryPool("Metaspace"), isMetaspaceMaxDefined);
  47 
  48         if (Platform.is64bit()) {
  49             if (InputArguments.contains("-XX:+UseCompressedOops")) {
  50                 MemoryPoolMXBean cksPool = getMemoryPool("Compressed Class Space");
  51                 verifyMemoryPool(cksPool, true);
  52             }
  53         }
  54     }
  55 
  56     private static void verifyThatMetaspaceMemoryManagerExists() {
  57         List<MemoryManagerMXBean> managers = ManagementFactory.getMemoryManagerMXBeans();
  58         for (MemoryManagerMXBean manager : managers) {
  59             if (manager.getName().equals("Metaspace Manager")) {
  60                 return;
  61             }
  62         }
  63 
  64         throw new RuntimeException("Expected to find a metaspace memory manager");
  65     }
  66 
  67     private static MemoryPoolMXBean getMemoryPool(String name) {
  68         List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans();
  69         for (MemoryPoolMXBean pool : pools) {
  70             if (pool.getName().equals(name)) {
  71                 return pool;
  72             }
  73         }
  74 
  75         throw new RuntimeException("Expected to find a memory pool with name " + name);
  76     }
  77 
  78     private static void verifyMemoryPool(MemoryPoolMXBean pool, boolean isMaxDefined) {
  79         MemoryUsage mu = pool.getUsage();
  80         long init = mu.getInit();
  81         long used = mu.getUsed();
  82         long committed = mu.getCommitted();
  83         long max = mu.getMax();
  84 
  85         assertGTE(init, 0L);
  86         assertGTE(used, init);
  87         assertGTE(committed, used);
  88 
  89         if (isMaxDefined) {
  90             assertGTE(max, committed);
  91         } else {
  92             assertEQ(max, -1L);
  93         }
  94     }
  95 }