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.util.ArrayList;
  28 import java.util.List;
  29 
  30 import jdk.jfr.Recording;
  31 import jdk.jfr.consumer.RecordedEvent;
  32 import jdk.jfr.internal.test.WhiteBox;
  33 import jdk.test.lib.jfr.EventNames;
  34 import jdk.test.lib.jfr.Events;
  35 
  36 /**
  37  * @test
  38  * @key jfr
  39  * @requires vm.hasJFR
  40  * @requires vm.gc == "null"
  41  * @library /test/lib /test/jdk
  42  * @modules jdk.jfr/jdk.jfr.internal.test
  43  * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestHeapDeep
  44  */
  45 public class TestHeapDeep {
  46 
  47     final static class ChainNode {
  48         final ChainNode next;
  49         List<byte[]> leaks;
  50 
  51         public ChainNode(ChainNode node) {
  52             next = node;
  53         }
  54     }
  55 
  56     public static ChainNode leak;
  57 
  58     public static void main(String[] args) throws Exception {
  59         WhiteBox.setWriteAllObjectSamples(true);
  60 
  61         try (Recording r = new Recording()) {
  62             r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
  63             r.start();
  64             leak = createChain();
  65             List<RecordedEvent> events = Events.fromRecording(r);
  66             if (OldObjects.countMatchingEvents(events, byte[].class, null, null, -1, "createChain") == 0) {
  67                 throw new Exception("Could not find ChainNode");
  68             }
  69             for (RecordedEvent e : events) {
  70                 OldObjects.validateReferenceChainLimit(e, OldObjects.MAX_CHAIN_LENGTH);
  71             }
  72         }
  73     }
  74 
  75     private static ChainNode createChain() {
  76         ChainNode node = new ChainNode(null);
  77         node.leaks = new ArrayList<>();
  78         for (int i = 0; i < 100; i++) {
  79             // Allocate arrays to trigger sampling code path for interpreter / c1
  80             node.leaks.add(new byte[10_000]);
  81         }
  82         for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
  83             node = new ChainNode(node);
  84         }
  85         return node;
  86     }
  87 }