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