/*

 * Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

 * 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).

 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

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/*

 * @test

 * @bug 8013120

 * @summary Release committed memory and make sure NMT handles it correctly

 * @key nmt regression

 * @modules java.base/jdk.internal.misc

 * @library /test/lib

 * @build sun.hotspot.WhiteBox

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail ReleaseCommittedMemory

 */

import sun.hotspot.WhiteBox;

public class ReleaseCommittedMemory {

  public static void main(String args[]) throws Exception {

    WhiteBox wb = WhiteBox.getWhiteBox();

    long reserveSize = 256 * 1024;

    long addr;

    addr = wb.NMTReserveMemory(reserveSize);

    wb.NMTCommitMemory(addr, 128*1024);

    wb.NMTReleaseMemory(addr, reserveSize);

  }

}