/*

 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.

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

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * 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).

 *

 * You should have received a copy of the GNU General Public License version

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

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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 */

/*

 * @test

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

 * @key nmt regression

 * @library /test/lib

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

 *          java.management

 * @build sun.hotspot.WhiteBox

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

 */

import jdk.test.lib.JDKToolFinder;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import sun.hotspot.WhiteBox;

public class ReleaseNoCommit {

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

        WhiteBox wb = WhiteBox.getWhiteBox();

        long reserveSize = 256 * 1024;

        long addr;

        ProcessBuilder pb = new ProcessBuilder();

        OutputAnalyzer output;

        // Grab my own PID

        String pid = Long.toString(ProcessTools.getProcessId());

        addr = wb.NMTReserveMemory(reserveSize);

        // Check for reserved

        pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "scale=KB"});

        output = new OutputAnalyzer(pb.start());

        output.shouldContain(" Test (reserved=256KB, committed=0KB)");

        wb.NMTReleaseMemory(addr, reserveSize);

        pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "scale=KB"});

        output = new OutputAnalyzer(pb.start());

        output.shouldNotContain("Test (reserved=");

    }

}