1 /* 2 * Copyright (c) 2014, 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 /* 25 * @test 26 * @bug 8013120 27 * @summary Release committed memory and make sure NMT handles it correctly 28 * @key nmt regression 29 * @library /testlibrary /testlibrary/whitebox 30 * @build ReleaseCommittedMemory 31 * @run main/othervm/bootclasspath -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail ReleaseCommittedMemory 32 */ 33 34 import sun.hotspot.WhiteBox; 35 36 public class ReleaseCommittedMemory { 37 38 public static void main(String args[]) throws Exception { 39 WhiteBox wb = WhiteBox.getWhiteBox(); 40 long reserveSize = 256 * 1024; 41 long addr; 42 43 addr = wb.NMTReserveMemory(reserveSize); 44 wb.NMTCommitMemory(addr, 128*1024); 45 wb.NMTReleaseMemory(addr, reserveSize); 46 wb.NMTWaitForDataMerge(); 47 } 48 } 49