| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MemoryPoolMXBean; |
| import java.lang.management.MemoryUsage; |
| |
| /** |
| * Utility class used by tests to get heap region usage. |
| */ |
| public final class HeapRegionUsageTool { |
| |
| /** |
| * Get MemoryUsage from MemoryPoolMXBean which name matches passed string. |
| * |
| * @param name |
| * @return MemoryUsage |
| */ |
| private static MemoryUsage getUsage(String name){ |
| for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) { |
| if (pool.getName().matches(name)) { |
| return pool.getUsage(); |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Get MemoryUsage of Eden space. |
| * |
| * @return MemoryUsage |
| */ |
| public static MemoryUsage getEdenUsage() { |
| return getUsage(".*Eden.*"); |
| } |
| |
| /** |
| * Get MemoryUsage of Survivor space. |
| * |
| * @return MemoryUsage |
| */ |
| public static MemoryUsage getSurvivorUsage() { |
| return getUsage(".*Survivor.*"); |
| } |
| |
| /** |
| * Get memory usage of Tenured space |
| * |
| * @return MemoryUsage |
| */ |
| public static MemoryUsage getOldUsage() { |
| return getUsage(".*(Old|Tenured).*"); |
| } |
| |
| /** |
| * Get heap usage. |
| * |
| * @return MemoryUsage |
| */ |
| public static MemoryUsage getHeapUsage() { |
| return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage(); |
| } |
| |
| /** |
| * Helper function to align up. |
| * |
| * @param value |
| * @param alignment |
| * @return aligned value |
| */ |
| public static long alignUp(long value, long alignment) { |
| return (value + alignment - 1) & ~(alignment - 1); |
| } |
| |
| /** |
| * Helper function to align down. |
| * |
| * @param value |
| * @param alignment |
| * @return aligned value |
| */ |
| public static long alignDown(long value, long alignment) { |
| return value & ~(alignment - 1); |
| } |
| } |