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 * 44 * 45 * @library /lib / 46 * 47 * @run main/othervm -XX:TLABSize=2k -XX:-FastTLABRefill jdk.jfr.event.oldobject.TestLastKnownHeapUsage 48 */ 49 public class TestLastKnownHeapUsage { 50 51 public final static List<Object> heap = new ArrayList<>(); 52 53 public static void main(String[] args) throws Exception { 54 WhiteBox.setWriteAllObjectSamples(true); 55 long last = 0; 56 for (int i = 1; i <= 5; i++) { 57 long heapUsage = recordOldObjects(i); 58 System.out.println("Recording: " + i + " heapUsage=" + heapUsage); 59 if (heapUsage < last) { 60 throw new Exception("Unexpect decrease of heap usage"); 61 } 62 } 63 } 64 65 private static long recordOldObjects(int index) throws IOException { 66 try (Recording r = new Recording()) { 67 r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity"); 68 r.start(); 69 System.gc(); 70 for (int i = 0; i < 20; i++) { 71 heap.add(new byte[1_000_000]); 72 } 73 System.gc(); 74 r.stop(); 75 Path p = Paths.get("recording-" + index + ".jfr"); 76 r.dump(p); 77 List<RecordedEvent> events = RecordingFile.readAllEvents(p); 78 Events.hasEvents(events); 79 long max = 0; 80 for (RecordedEvent e : RecordingFile.readAllEvents(p)) { 81 long heapUsage = Events.assertField(e, "lastKnownHeapUsage").atLeast(0L).below(1_000_000_000L).getValue(); 82 max = Math.max(max, heapUsage); 83 } 84 return max; 85 } 86 } 87 }