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 * 41 * 42 * @key jfr 43 * @library /lib / 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 main(String[] args)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 } 88