1 /*
   2  * Copyright (c) 2016, 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.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.test.lib.Asserts;
  34 import jdk.test.lib.jfr.EventNames;
  35 import jdk.test.lib.jfr.Events;
  36 
  37 /**
  38  * @test
  39  * @bug 8009538
  40  * @requires vm.hasJFR
  41  * @requires vm.gc == "G1" | vm.gc == null
  42  * @key jfr
  43  * @library /test/lib /test/jdk
  44  * @run main/othervm -XX:NewSize=2m -XX:MaxNewSize=2m -Xmx32m -XX:+UseG1GC -XX:+NeverTenure jdk.jfr.event.gc.detailed.TestTenuringDistributionEvent
  45  */
  46 
  47 public class TestTenuringDistributionEvent {
  48     private final static String EVENT_NAME = EventNames.TenuringDistribution;
  49 
  50     public static void main(String[] args) throws Exception {
  51         Recording recording = null;
  52         try {
  53             recording = new Recording();
  54             // activate the event we are interested in and start recording
  55             recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
  56             recording.start();
  57 
  58             // Setting NewSize and MaxNewSize will limit eden, so
  59             // allocating 1024 20k byte arrays should trigger at
  60             // least a few Young GCs.
  61             byte[][] array = new byte[1024][];
  62             for (int i = 0; i < array.length; i++) {
  63                 array[i] = new byte[20 * 1024];
  64             }
  65             recording.stop();
  66 
  67             // Verify recording
  68             List<RecordedEvent> events = Events.fromRecording(recording);
  69             Asserts.assertFalse(events.isEmpty(), "No events found");
  70             for (RecordedEvent event : events) {
  71                 Events.assertField(event, "gcId").notEqual(-1);
  72                 Events.assertField(event, "age").notEqual(0);
  73                 Events.assertField(event, "size").atLeast(0L);
  74             }
  75 
  76         } catch (Throwable t) {
  77             if (recording != null) {
  78                 recording.dump(Paths.get("TestTenuringDistribution.jfr"));
  79             }
  80             throw t;
  81         } finally {
  82             if (recording != null) {
  83                 recording.close();
  84             }
  85         }
  86     }
  87 }