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.*; 26 27 import com.oracle.java.testlibrary.*; 28 import static com.oracle.java.testlibrary.Asserts.*; 29 30 /* @test TestPerfCountersAndMemoryPools 31 * @bug 8023476 32 * @summary Tests that a MemoryPoolMXBeans and PerfCounters for metaspace 33 * report the same data. 34 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedKlassPointers -XX:+UseSerialGC TestPerfCountersAndMemoryPools 35 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers -XX:+UseSerialGC TestPerfCountersAndMemoryPools 36 */ 37 public class TestPerfCountersAndMemoryPools { 38 public static void main(String[] args) throws Exception { 39 checkMemoryUsage("Metaspace", "sun.gc.metaspace"); 40 41 if (InputArguments.contains("-XX:+UseCompressedKlassPointers") && Platform.is64bit()) { 42 checkMemoryUsage("Compressed Class Space", "sun.gc.compressedclassspace"); 43 } 44 } 45 46 private static MemoryUsage getMemoryUsage(String memoryPoolName) { 47 List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans(); 48 for (MemoryPoolMXBean pool : pools) { 49 if (pool.getName().equals(memoryPoolName)) { 50 return pool.getUsage(); 51 } 52 } 53 54 throw new RuntimeException("Excpted to find a memory pool with name " + 55 memoryPoolName); 56 } 57 58 private static void checkMemoryUsage(String memoryPoolName, String perfNS) 59 throws Exception { 60 // Need to do a gc before each comparison to update the perf counters 61 62 System.gc(); 63 MemoryUsage mu = getMemoryUsage(memoryPoolName); 64 assertEQ(getMinCapacity(perfNS), mu.getInit()); 65 66 System.gc(); 67 mu = getMemoryUsage(memoryPoolName); 68 assertEQ(getUsed(perfNS), mu.getUsed()); 69 70 System.gc(); 71 mu = getMemoryUsage(memoryPoolName); 72 assertEQ(getCapacity(perfNS), mu.getCommitted()); 73 } 74 75 private static long getMinCapacity(String ns) throws Exception { 76 return PerfCounters.findByName(ns + ".minCapacity").longValue(); 77 } 78 79 private static long getCapacity(String ns) throws Exception { 80 return PerfCounters.findByName(ns + ".capacity").longValue(); 81 } 82 83 private static long getUsed(String ns) throws Exception { 84 return PerfCounters.findByName(ns + ".used").longValue(); 85 } 86 }