1 /*

     2  * Copyright (c) 2013, 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 ClassFileInstaller sun.hotspot.WhiteBox

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

    33  */

    34 

    35 import sun.hotspot.WhiteBox;

    36 

    37 public class ReleaseCommittedMemory {

    38 

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

    40     WhiteBox wb = WhiteBox.getWhiteBox();

    41     long reserveSize = 256 * 1024;

    42     long addr;

    43 

    44     addr = wb.NMTReserveMemory(reserveSize);

    45     wb.NMTCommitMemory(addr, 128*1024);

    46     wb.NMTReleaseMemory(addr, reserveSize);

    47     wb.NMTWaitForDataMerge();

    48   }

    49 }

    50