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 * @library /testlibrary 33 * @summary Tests that a MemoryPoolMXBeans and PerfCounters for metaspace 34 * report the same data. 35 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-UseCompressedOops -XX:-UseCompressedKlassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint TestPerfCountersAndMemoryPools 36 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UseCompressedOops -XX:+UseCompressedKlassPointers -XX:+UseSerialGC -XX:+UsePerfData -Xint TestPerfCountersAndMemoryPools 37 */ 38 public class TestPerfCountersAndMemoryPools { 39 public static void main(String[] args) throws Exception { 40 checkMemoryUsage("Metaspace", "sun.gc.metaspace"); 41 42 if (InputArguments.contains("-XX:+UseCompressedKlassPointers") && Platform.is64bit()) { 43 checkMemoryUsage("Compressed Class Space", "sun.gc.compressedclassspace"); 44 } 45 } 46 47 private static MemoryPoolMXBean getMemoryPool(String memoryPoolName) { 48 List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans(); 49 for (MemoryPoolMXBean pool : pools) { 50 if (pool.getName().equals(memoryPoolName)) { 51 return pool; 52 } 53 } 54 55 throw new RuntimeException("Excpted to find a memory pool with name " + 56 memoryPoolName); 57 } 58 59 private static void checkMemoryUsage(String memoryPoolName, String perfNS) 60 throws Exception { 61 MemoryPoolMXBean pool = getMemoryPool(memoryPoolName); 62 63 // Must do a GC to update performance counters 64 System.gc(); 65 assertEQ(getMinCapacity(perfNS), pool.getUsage().getInit()); 66 67 // Must do a second GC to update the perfomance counters again, since 68 // the call pool.getUsage().getInit() could have allocated some 69 // metadata. 70 System.gc(); 71 assertEQ(getUsed(perfNS), pool.getUsage().getUsed()); 72 assertEQ(getCapacity(perfNS), pool.getUsage().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 }