1 /*

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

     3  *

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

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

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    11  * version 2 for more details (a copy is included in the LICENSE file that

    12  * accompanied this code).

    13  *

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

    15  * 2 along with this work; if not, write to the Free Software Foundation,

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

    17  *

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

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

    20  * questions.

    21  *

    22  */

    23 

    24 /*

    25  * @test

    26  * @key nmt jcmd

    27  * @library /test/lib

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

    29  *          java.management

    30  * @build sun.hotspot.WhiteBox

    31  * @run driver ClassFileInstaller sun.hotspot.WhiteBox

    32  *                              sun.hotspot.WhiteBox$WhiteBoxPermission

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

    34  */

    35 

    36 import java.util.Random;

    37 import jdk.test.lib.process.ProcessTools;

    38 import jdk.test.lib.process.OutputAnalyzer;

    39 import jdk.test.lib.JDKToolFinder;

    40 import sun.hotspot.WhiteBox;

    41 

    42 public class HugeArenaTracking {

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

    44 

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

    46     OutputAnalyzer output;

    47     final WhiteBox wb = WhiteBox.getWhiteBox();

    48 

    49     // Grab my own PID

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

    51     ProcessBuilder pb = new ProcessBuilder();

    52 

    53     long arena1 = wb.NMTNewArena(1024);

    54     long arena2 = wb.NMTNewArena(1024);

    55 

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

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

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

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

    60 

    61     Random rand = new Random();

    62 

    63     // Allocate 2GB+ from arena

    64     long total = 0;

    65     while (total < 2 * GB) {

    66       // Cap to 10M

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

    68       wb.NMTArenaMalloc(arena1, inc);

    69       total += inc;

    70     }

    71 

    72     ProcessBuilder pb2 = new ProcessBuilder();

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

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

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

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

    77 

    78     wb.NMTFreeArena(arena1);

    79 

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

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

    82     wb.NMTFreeArena(arena2);

    83 

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

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

    86   }

    87 }