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 

    26 package jdk.jfr.jcmd;

    27 

    28 import java.io.File;

    29 import java.io.IOException;

    30 import java.util.ArrayList;

    31 import java.util.Collections;

    32 import java.util.HashMap;

    33 import java.util.List;

    34 import java.util.Map;

    35 

    36 import jdk.jfr.Enabled;

    37 import jdk.jfr.Recording;

    38 import jdk.jfr.consumer.RecordedEvent;

    39 import jdk.jfr.consumer.RecordedObject;

    40 import jdk.jfr.consumer.RecordingFile;

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

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

    43 

    44 /*

    45  * @test

    46  * @summary Start a recording with or without path-to-gc-roots

    47  * @modules jdk.jfr/jdk.jfr.internal.test

    48  * @library /test/lib /test/jdk

    49  * @key jfr

    50  *

    51  * @run main/othervm -XX:TLABSize=2k jdk.jfr.jcmd.TestJcmdDumpPathToGCRoots

    52  */

    53 public class TestJcmdDumpPathToGCRoots {

    54 

    55     private static final int OBJECT_COUNT = 100_000;

    56     public static List<Object[]> leak = new ArrayList<>(OBJECT_COUNT);

    57 

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

    59         WhiteBox.setWriteAllObjectSamples(true);

    60 

    61         String settingName = EventNames.OldObjectSample + "#" + "cutoff";

    62 

    63         // dump parameter trumps previous setting

    64         testDump("path-to-gc-roots=true", Collections.singletonMap(settingName, "infinity"), true);

    65         testDump("path-to-gc-roots=true", Collections.singletonMap(settingName, "0 ns"), true);

    66         testDump("path-to-gc-roots=true", Collections.emptyMap(), true);

    67 

    68         testDump("path-to-gc-roots=false", Collections.singletonMap(settingName, "infinity"), false);

    69         testDump("path-to-gc-roots=false", Collections.singletonMap(settingName, "0 ns"), false);

    70         testDump("path-to-gc-roots=false", Collections.emptyMap(), false);

    71 

    72         testDump("", Collections.singletonMap(settingName, "infinity"), true);

    73         testDump("", Collections.singletonMap(settingName, "0 ns"), false);

    74         testDump("", Collections.emptyMap(), false);

    75     }

    76 

    77     private static void testDump(String pathToGcRoots, Map<String, String> settings, boolean expectedChains) throws Exception {

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

    79             Map<String, String> p = new HashMap<>(settings);

    80             p.put(EventNames.OldObjectSample + "#" + Enabled.NAME, "true");

    81             r.setName("dodo");

    82             r.setSettings(p);

    83             r.setToDisk(true);

    84             r.start();

    85             clearLeak();

    86             System.out.println("Recording id: " + r.getId());

    87             System.out.println("Settings: " + settings.toString());

    88             System.out.println("Command: JFR.dump " + pathToGcRoots);

    89             System.out.println("Chains expected: " + expectedChains);

    90             buildLeak();

    91             System.gc();

    92             System.gc();

    93             File recording = new File("TestJcmdDumpPathToGCRoots" + r.getId() + ".jfr");

    94             recording.delete();

    95             JcmdHelper.jcmd("JFR.dump", "name=dodo", pathToGcRoots, "filename=" + recording.getAbsolutePath());

    96             r.setSettings(Collections.emptyMap());

    97             List<RecordedEvent> events = RecordingFile.readAllEvents(recording.toPath());

    98             if (events.isEmpty()) {

    99                 throw new Exception("No events found in recoding");

   100             }

   101             boolean chains = hasChains(events);

   102             if (expectedChains && !chains) {

   103                 System.out.println(events);

   104                 throw new Exception("Expected chains but found none");

   105             }

   106             if (!expectedChains && chains) {

   107                 System.out.println(events);

   108                 throw new Exception("Didn't expect chains but found some");

   109             }

   110         }

   111     }

   112 

   113     private static void clearLeak() {

   114       leak.clear();

   115     }

   116 

   117     private static boolean hasChains(List<RecordedEvent> events) throws IOException {

   118         for (RecordedEvent e : events) {

   119             RecordedObject ro = e.getValue("object");

   120             if (ro.getValue("referrer") != null) {

   121                 return true;

   122             }

   123         }

   124         return false;

   125     }

   126 

   127     private static void buildLeak() {

   128         for (int i = 0; i < OBJECT_COUNT;i ++) {

   129             leak.add(new Object[0]);

   130         }

   131     }

   132 }