| /* |
| * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.jfr.event.oldobject; |
| |
| import java.io.IOException; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import jdk.jfr.Recording; |
| import jdk.jfr.consumer.RecordedEvent; |
| import jdk.jfr.consumer.RecordingFile; |
| import jdk.jfr.internal.test.WhiteBox; |
| import jdk.test.lib.jfr.EventNames; |
| import jdk.test.lib.jfr.Events; |
| |
| /** |
| * @test |
| * @key jfr |
| * @requires vm.hasJFR |
| * @requires vm.gc == "null" |
| * @library /test/lib /test/jdk |
| * @modules jdk.jfr/jdk.jfr.internal.test |
| * @run main/othervm -XX:TLABSize=2k -XX:-FastTLABRefill jdk.jfr.event.oldobject.TestLastKnownHeapUsage |
| */ |
| public class TestLastKnownHeapUsage { |
| |
| public final static List<Object> heap = new ArrayList<>(); |
| |
| public static void main(String[] args) throws Exception { |
| WhiteBox.setWriteAllObjectSamples(true); |
| long last = 0; |
| for (int i = 1; i <= 5; i++) { |
| long heapUsage = recordOldObjects(i); |
| System.out.println("Recording: " + i + " heapUsage=" + heapUsage); |
| if (heapUsage < last) { |
| throw new Exception("Unexpect decrease of heap usage"); |
| } |
| } |
| } |
| |
| private static long recordOldObjects(int index) throws IOException { |
| try (Recording r = new Recording()) { |
| r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity"); |
| r.start(); |
| System.gc(); |
| for (int i = 0; i < 20; i++) { |
| heap.add(new byte[1_000_000]); |
| } |
| System.gc(); |
| r.stop(); |
| Path p = Paths.get("recording-" + index + ".jfr"); |
| r.dump(p); |
| List<RecordedEvent> events = RecordingFile.readAllEvents(p); |
| Events.hasEvents(events); |
| long max = 0; |
| for (RecordedEvent e : RecordingFile.readAllEvents(p)) { |
| long heapUsage = Events.assertField(e, "lastKnownHeapUsage").atLeast(0L).below(1_000_000_000L).getValue(); |
| max = Math.max(max, heapUsage); |
| } |
| return max; |
| } |
| } |
| } |