ReleaseNoCommit.java

/*
 * Copyright (c) 2014, 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 /testlibrary /testlibrary/whitebox
 * @build ReleaseNoCommit
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=summary ReleaseNoCommit
 */

import com.oracle.java.testlibrary.JDKToolFinder;
import com.oracle.java.testlibrary.OutputAnalyzer;
import com.oracle.java.testlibrary.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 = Integer.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=");
    }
}