1 /*

     2  * Copyright (c) 2013, 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.gc.objectcount;

    27 

    28 import java.util.List;

    29 import java.util.HashMap;

    30 

    31 import jdk.jfr.consumer.RecordedEvent;

    32 import jdk.test.lib.Asserts;

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

    34 

    35 class Foo {

    36 }

    37 

    38 class Constants {

    39     public static final int oneMB = 1048576;

    40 }

    41 

    42 public class ObjectCountEventVerifier {

    43     public static Foo[] foos;

    44 

    45     public static void createTestData() {

    46         foos = new Foo[Constants.oneMB];

    47     }

    48 

    49     public static void verify(List<RecordedEvent> objectCountEvents) throws Exception {

    50         Asserts.assertFalse(objectCountEvents.isEmpty(), "Expected at least one object count event");

    51         // Object count events should be sent only for those classes which instances occupy over 0.5%

    52         // of the heap. Therefore there can't be more than 200 events

    53         Asserts.assertLessThanOrEqual(objectCountEvents.size(), 200, "Expected at most 200 object count events");

    54 

    55         HashMap<String, Long> numInstancesOfClass = new HashMap<String, Long>();

    56         HashMap<String, Long> sizeOfInstances = new HashMap<String, Long>();

    57 

    58         for (RecordedEvent event : objectCountEvents) {

    59             String className = Events.assertField(event, "objectClass.name").notEmpty().getValue();

    60             long count = Events.assertField(event, "count").atLeast(0L).getValue();

    61             long totalSize = Events.assertField(event, "totalSize").atLeast(1L).getValue();

    62             System.out.println(className);

    63             numInstancesOfClass.put(className, count);

    64             sizeOfInstances.put(className, totalSize);

    65         }

    66         System.out.println(numInstancesOfClass);

    67         final String fooArrayName = "[Ljdk/jfr/event/gc/objectcount/Foo;";

    68         Asserts.assertTrue(numInstancesOfClass.containsKey(fooArrayName), "Expected an event for the Foo array");

    69         Asserts.assertEquals(sizeOfInstances.get(fooArrayName), expectedFooArraySize(Constants.oneMB), "Wrong size of the Foo array");

    70     }

    71 

    72     private static long expectedFooArraySize(long count) {

    73         boolean runsOn32Bit = System.getProperty("sun.arch.data.model").equals("32");

    74         int bytesPerWord = runsOn32Bit ? 4 : 8;

    75         int objectHeaderSize = bytesPerWord * 3; // length will be aligned on 64 bits

    76         int alignmentInOopArray = runsOn32Bit ? 4 : 0;

    77         int ptrSize = bytesPerWord;

    78         return objectHeaderSize + alignmentInOopArray + count * ptrSize;

    79     }

    80 }