/*

 * Copyright (c) 2019, Red Hat, Inc. All rights reserved.

 *

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

/*

 * @test

 * @key nmt jcmd

 * @library /test/lib

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

 *          java.management

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

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

 */

import java.util.Random;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.JDKToolFinder;

import sun.hotspot.WhiteBox;

public class HugeArenaTracking {

  private static final long GB = 1024 * 1024 * 1024;

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

    OutputAnalyzer output;

    final WhiteBox wb = WhiteBox.getWhiteBox();

    // Grab my own PID

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

    ProcessBuilder pb = new ProcessBuilder();

    long arena1 = wb.NMTNewArena(1024);

    long arena2 = wb.NMTNewArena(1024);

    // Run 'jcmd <pid> VM.native_memory summary'

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

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

    output.shouldContain("Test (reserved=2KB, committed=2KB)");

    Random rand = new Random();

    // Allocate 2GB+ from arena

    long total = 0;

    while (total < 2 * GB) {

      // Cap to 10M

      long inc = rand.nextInt(10 * 1024 * 1024);

      wb.NMTArenaMalloc(arena1, inc);

      total += inc;

    }

    ProcessBuilder pb2 = new ProcessBuilder();

    // Run 'jcmd <pid> VM.native_memory summary'

    pb2.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "summary", "scale=GB"});

    output = new OutputAnalyzer(pb2.start());

    output.shouldContain("Test (reserved=2GB, committed=2GB)");

    wb.NMTFreeArena(arena1);

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

    output.shouldContain("Test (reserved=1KB, committed=1KB)");

    wb.NMTFreeArena(arena2);

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

    output.shouldNotContain("Test (reserved");

  }

}