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