1 /*
   2  * Copyright (c) 2016, 2019, 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.nio.file.Paths;
  28 import java.time.Duration;
  29 import java.util.List;
  30 
  31 import jdk.jfr.Recording;
  32 import jdk.jfr.consumer.RecordedEvent;
  33 import jdk.testlibrary.Asserts;
  34 import jdk.testlibrary.jfr.EventNames;
  35 import jdk.testlibrary.jfr.Events;
  36 
  37 /*
  38  * @test
  39  * @bug 8009538
  40  * @requires vm.gc == "G1" | vm.gc == null
  41  * @key jfr
  42  * @library /lib/testlibrary
  43  * @run main/othervm -XX:NewSize=2m -XX:MaxNewSize=2m -Xmx32m -XX:+UseG1GC -XX:+NeverTenure jdk.jfr.event.gc.detailed.TestTenuringDistributionEvent
  44  */
  45 
  46 public class TestTenuringDistributionEvent {
  47     private final static String EVENT_NAME = EventNames.TenuringDistribution;
  48 
  49     public static void main(String[] args) throws Exception {
  50         Recording recording = null;
  51         try {
  52             recording = new Recording();
  53             // activate the event we are interested in and start recording
  54             recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
  55             recording.start();
  56 
  57             // Setting NewSize and MaxNewSize will limit eden, so
  58             // allocating 1024 20k byte arrays should trigger at
  59             // least a few Young GCs.
  60             byte[][] array = new byte[1024][];
  61             for (int i = 0; i < array.length; i++) {
  62                 array[i] = new byte[20 * 1024];
  63             }
  64             recording.stop();
  65 
  66             // Verify recording
  67             List<RecordedEvent> events = Events.fromRecording(recording);
  68             Asserts.assertFalse(events.isEmpty(), "No events found");
  69             for (RecordedEvent event : events) {
  70                 Events.assertField(event, "gcId").notEqual(-1);
  71                 Events.assertField(event, "age").notEqual(0);
  72                 Events.assertField(event, "size").atLeast(0L);
  73             }
  74 
  75         } catch (Throwable t) {
  76             if (recording != null) {
  77                 recording.dump(Paths.get("TestTenuringDistribution.jfr"));
  78             }
  79             throw t;
  80         } finally {
  81             if (recording != null) {
  82                 recording.close();
  83             }
  84         }
  85     }
  86 }