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.List;

    28 

    29 import jdk.jfr.Recording;

    30 import jdk.jfr.consumer.RecordedEvent;

    31 import jdk.jfr.internal.test.WhiteBox;

    32 import jdk.test.lib.jfr.EventNames;

    33 import jdk.test.lib.jfr.Events;

    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.TestReferenceChainLimit

    42  */

    43 public class TestReferenceChainLimit {

    44     private final static int TEST_CHAIN_LENGTH_FACTOR = 10; // scaling factor for the how long chain to be used in the test

    45 

    46     final static class ChainNode {

    47         final ChainNode next;

    48         byte[] leak;

    49 

    50         public ChainNode(ChainNode node) {

    51             next = node;

    52             leak = new byte[10_000];

    53         }

    54     }

    55 

    56     private static ChainNode createChain() {

    57         ChainNode node = null;

    58         final int testChainLength = OldObjects.MAX_CHAIN_LENGTH * TEST_CHAIN_LENGTH_FACTOR;

    59         for (int i = 0; i < testChainLength; i++) {

    60             node = new ChainNode(node);

    61         }

    62         return node;

    63     }

    64 

    65     public static ChainNode leak;

    66 

    67     public static void main(String[] args) throws Exception {

    68         WhiteBox.setWriteAllObjectSamples(true);

    69 

    70         try (Recording r = new Recording()) {

    71             r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");

    72             r.start();

    73             leak = createChain();

    74             List<RecordedEvent> events = Events.fromRecording(r);

    75             if (OldObjects.countMatchingEvents(events, byte[].class, null, null, -1, "createChain") == 0) {

    76                 throw new Exception("Could not find ChainNode");

    77             }

    78             for (RecordedEvent e : events) {

    79                 OldObjects.validateReferenceChainLimit(e, OldObjects.MAX_CHAIN_LENGTH);

    80             }

    81         }

    82     }

    83 }