108 lines
2.9 KiB
Java
108 lines
2.9 KiB
Java
/*
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.arguments;
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import java.lang.management.ManagementFactory;
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import java.lang.management.MemoryPoolMXBean;
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import java.lang.management.MemoryUsage;
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/**
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* Utility class used by tests to get heap region usage.
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*/
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public final class HeapRegionUsageTool {
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/**
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* Get MemoryUsage from MemoryPoolMXBean which name matches passed string.
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*
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* @param name
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* @return MemoryUsage
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*/
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private static MemoryUsage getUsage(String name){
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for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) {
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if (pool.getName().matches(name)) {
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return pool.getUsage();
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}
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}
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return null;
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}
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/**
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* Get MemoryUsage of Eden space.
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*
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* @return MemoryUsage
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*/
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public static MemoryUsage getEdenUsage() {
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return getUsage(".*Eden.*");
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}
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/**
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* Get MemoryUsage of Survivor space.
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*
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* @return MemoryUsage
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*/
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public static MemoryUsage getSurvivorUsage() {
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return getUsage(".*Survivor.*");
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}
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/**
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* Get memory usage of Tenured space
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*
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* @return MemoryUsage
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*/
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public static MemoryUsage getOldUsage() {
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return getUsage(".*(Old|Tenured).*");
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}
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/**
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* Get heap usage.
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*
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* @return MemoryUsage
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*/
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public static MemoryUsage getHeapUsage() {
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return ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
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}
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/**
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* Helper function to align up.
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*
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* @param value
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* @param alignment
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* @return aligned value
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*/
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public static long alignUp(long value, long alignment) {
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return (value + alignment - 1) & ~(alignment - 1);
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}
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/**
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* Helper function to align down.
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*
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* @param value
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* @param alignment
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* @return aligned value
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*/
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public static long alignDown(long value, long alignment) {
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return value & ~(alignment - 1);
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}
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}
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