1 /*
   2  * Copyright (c) 2018, 2019, 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 
  26 package jdk.jfr.event.oldobject;
  27 
  28 import java.util.ArrayList;
  29 import java.util.List;
  30 
  31 import jdk.jfr.Recording;
  32 import jdk.jfr.internal.test.WhiteBox;
  33 import jdk.testlibrary.jfr.EventNames;
  34 import jdk.testlibrary.jfr.OldObjects;
  35 
  36 /*
  37  * @test
  38  * @key jfr
  39  * @requires vm.gc == "null"
  40  * @library /lib/testlibrary
  41  * @modules jdk.jfr/jdk.jfr.internal.test
  42  * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestHeapShallow
  43  */
  44 public class TestHeapShallow {
  45     private final static long LARGE_OBJECT_FACTOR = 509; // prime number
  46 
  47     static class LeakObject {
  48         Object object = null;
  49 
  50         public LeakObject(Object object) {
  51             this.object = object;
  52         }
  53     }
  54 
  55     public static ArrayList<LeakObject> leak =  new ArrayList<>(OldObjects.MIN_SIZE);
  56 
  57     public static void main(String[] args) throws Exception {
  58         WhiteBox.setWriteAllObjectSamples(true);
  59 
  60         try (Recording recording = new Recording()) {
  61             recording.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
  62             recording.start();
  63 
  64             addObjectsToShallowArray(leak);
  65             recording.stop();
  66             if (OldObjects.countMatchingEvents(recording, "addObjectsToShallowArray", byte[].class, "object", LeakObject.class, -1) < 1) {
  67                 throw new Exception("Could not find shallow leak object");
  68             }
  69         }
  70     }
  71 
  72     private static void addObjectsToShallowArray(List<LeakObject> list) {
  73         for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
  74             if (i % LARGE_OBJECT_FACTOR == 0) {
  75                 // Triggers allocation outside TLAB path
  76                 list.add(new LeakObject(new byte[16384]));
  77             } else {
  78                 // Triggers allocation in TLAB path
  79                 list.add(new LeakObject(new byte[10]));
  80             }
  81         }
  82     }
  83 }