1 /*

     2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

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

    23  * questions.

    24  */

    25 package jdk.jfr.event.gc.detailed;

    26 

    27 import java.util.List;

    28 

    29 import jdk.jfr.Recording;

    30 import jdk.jfr.consumer.RecordedEvent;

    31 import jdk.test.lib.jfr.EventNames;

    32 import jdk.test.lib.jfr.Events;

    33 

    34 /*

    35  * @test

    36  * @key jfr

    37  * @requires vm.gc == "G1" | vm.gc == null

    38  * @library /test/lib /test/jdk

    39  * @run main/othervm -XX:NewSize=2m -XX:MaxNewSize=2m -Xmx32m -XX:+UseG1GC -XX:MaxGCPauseMillis=75 -XX:GCPauseIntervalMillis=150 -XX:+UnlockExperimentalVMOptions -XX:-UseFastUnorderedTimeStamps jdk.jfr.event.gc.detailed.TestG1MMUEvent

    40  */

    41 public class TestG1MMUEvent {

    42 

    43     // Corresponds to command-line setting -XX:GCPauseIntervalMillis=150

    44     private final static double TIME_SLICE = 0.15;

    45 

    46     // Corresponds to command-line setting -XX:MaxGCPauseMillis=75

    47     private final static double MAX_GC_TIME = 0.075;

    48 

    49     private final static String EVENT_NAME = EventNames.G1MMU;

    50 

    51     public static byte[] bytes;

    52 

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

    54 

    55         Recording recording = new Recording();

    56 

    57         // activate the event we are interested in and start recording

    58         recording.enable(EVENT_NAME);

    59         recording.start();

    60 

    61         // Setting NewSize and MaxNewSize will limit eden, so

    62         // allocating 1024 5k byte arrays should trigger at

    63         // least one Young GC.

    64         for (int i = 0; i < 1024; i++) {

    65             bytes  = new byte[5 * 1024];

    66         }

    67         recording.stop();

    68 

    69         // Verify recording

    70         List<RecordedEvent> all = Events.fromRecording(recording);

    71         Events.hasEvents(all);

    72 

    73         for (RecordedEvent e : all) {

    74             Events.assertField(e, "gcId").above(0);

    75             Events.assertField(e, "timeSlice").isEqual(TIME_SLICE);

    76             Events.assertField(e, "pauseTarget").isEqual(MAX_GC_TIME);

    77         }

    78 

    79         recording.close();

    80     }

    81 }