1 /* 2 * Copyright (c) 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 package jdk.test.lib; 25 26 import java.lang.management.ManagementFactory; 27 import java.lang.management.MemoryPoolMXBean; 28 import java.lang.management.MemoryUsage; 29 30 /** 31 * Utility class used by tests to get heap region usage. 32 */ 33 public final class HeapRegionUsageTool { 34 35 /** 36 * Get MemoryUsage from MemoryPoolMXBean which name matches passed string. 37 * 38 * @param name 39 * @return MemoryUsage 40 */ 41 private static MemoryUsage getUsage(String name){ 42 for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) { 43 if (pool.getName().matches(name)) { 44 return pool.getUsage(); 45 } 46 } 47 return null; 48 } 49 50 /** 51 * Get MemoryUsage of Eden space. 52 * 53 * @return MemoryUsage 54 */ 55 public static MemoryUsage getEdenUsage() { 56 return getUsage(".*Eden.*"); 57 } 58 59 /** 60 * Get MemoryUsage of Survivor space. 61 * 62 * @return MemoryUsage 63 */ 64 public static MemoryUsage getSurvivorUsage() { 65 return getUsage(".*Survivor.*"); 66 } 67 68 /** 69 * Get memory usage of Tenured space 70 * 71 * @return MemoryUsage 72 */ 73 public static MemoryUsage getOldUsage() { 74 return getUsage(".*(Old|Tenured).*"); 75 } 76 77 /** 78 * Get heap usage. 79 * 80 * @return MemoryUsage 81 */ 82 public static MemoryUsage getHeapUsage() { 83 return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); 84 } 85 86 /** 87 * Helper function to align up. 88 * 89 * @param value 90 * @param alignment 91 * @return aligned value 92 */ 93 public static long alignUp(long value, long alignment) { 94 return (value + alignment - 1) & ~(alignment - 1); 95 } 96 97 /** 98 * Helper function to align down. 99 * 100 * @param value 101 * @param alignment 102 * @return aligned value 103 */ 104 public static long alignDown(long value, long alignment) { 105 return value & ~(alignment - 1); 106 } 107 }