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