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.oldobject; 26 27 import java.io.IOException; 28 import java.nio.file.Path; 29 import java.nio.file.Paths; 30 import java.util.ArrayList; 31 import java.util.List; 32 33 import jdk.jfr.Recording; 34 import jdk.jfr.consumer.RecordedEvent; 35 import jdk.jfr.consumer.RecordingFile; 36 import jdk.jfr.internal.test.WhiteBox; 37 import jdk.test.lib.jfr.EventNames; 38 import jdk.test.lib.jfr.Events; 39 40 /* 41 * @test 42 * @key jfr 43 * @requires vm.gc == "null" 44 * @library /test/lib /test/jdk 45 * @modules jdk.jfr/jdk.jfr.internal.test 46 * @run main/othervm -XX:TLABSize=2k -XX:-FastTLABRefill jdk.jfr.event.oldobject.TestLastKnownHeapUsage 47 */ 48 public class TestLastKnownHeapUsage { 49 50 public final static List<Object> heap = new ArrayList<>(); 51 52 public static void main(String[] args) throws Exception { 53 WhiteBox.setWriteAllObjectSamples(true); 54 long last = 0; 55 for (int i = 1; i <= 5; i++) { 56 long heapUsage = recordOldObjects(i); 57 System.out.println("Recording: " + i + " heapUsage=" + heapUsage); 58 if (heapUsage < last) { 59 throw new Exception("Unexpect decrease of heap usage"); 60 } 61 } 62 } 63 64 private static long recordOldObjects(int index) throws IOException { 65 try (Recording r = new Recording()) { 66 r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity"); 67 r.start(); 68 System.gc(); 69 for (int i = 0; i < 20; i++) { 70 heap.add(new byte[1_000_000]); 71 } 72 System.gc(); 73 r.stop(); 74 Path p = Paths.get("recording-" + index + ".jfr"); 75 r.dump(p); 76 List<RecordedEvent> events = RecordingFile.readAllEvents(p); 77 Events.hasEvents(events); 78 long max = 0; 79 for (RecordedEvent e : RecordingFile.readAllEvents(p)) { 80 long heapUsage = Events.assertField(e, "lastKnownHeapUsage").atLeast(0L).below(1_000_000_000L).getValue(); 81 max = Math.max(max, heapUsage); 82 } 83 return max; 84 } 85 } 86 }