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/*

 * @test

 * @bug 8013120

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

 * @key nmt regression

 * @library /testlibrary /testlibrary/whitebox

 * @build ReleaseCommittedMemory

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 * @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);

  }

}