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.startupargs;
  27 
  28 import java.util.ArrayList;
  29 import java.util.List;
  30 
  31 import jdk.jfr.Recording;
  32 import jdk.jfr.consumer.RecordedEvent;
  33 import jdk.jfr.internal.test.WhiteBox;
  34 import jdk.test.lib.jfr.EventNames;
  35 import jdk.test.lib.jfr.Events;
  36 
  37 /*
  38  * @test
  39  * @summary Test -XX:FlightRecorderOptions=old-object-queue-size
  40  * @modules jdk.jfr/jdk.jfr.internal.test
  41  * @library /test/lib
  42  * @key jfr
  43  *
  44  * @run main/othervm -XX:TLABSize=2k -XX:-FastTLABRefill -XX:FlightRecorderOptions=old-object-queue-size=0 jdk.jfr.startupargs.TestOldObjectQueueSize off
  45  * @run main/othervm -XX:TLABSize=2k -Xlog:gc+tlab=trace -XX:-FastTLABRefill -XX:FlightRecorderOptions=old-object-queue-size=10000 jdk.jfr.startupargs.TestOldObjectQueueSize many
  46  * @run main/othervm -XX:TLABSize=2k -Xlog:gc+tlab=trace -XX:-FastTLABRefill -XX:FlightRecorderOptions=old-object-queue-size=1000000 jdk.jfr.startupargs.TestOldObjectQueueSize many
  47  */
  48 public class TestOldObjectQueueSize {
  49 
  50     private static final int OBJECT_COUNT = 10_000;
  51     private static final int DEFAULT_OLD_OBJECT_QUEUE_SIZE = 256;
  52 
  53     public final static List<Object> leak = new ArrayList<>(OBJECT_COUNT);
  54 
  55     public static void main(String[] args) throws Exception {
  56         WhiteBox.setWriteAllObjectSamples(true);
  57         System.out.println("TESTING: " + args[0]);
  58 
  59         String amount = args[0];
  60         try (Recording recording = new Recording()) {
  61             recording.enable(EventNames.OldObjectSample).withoutStackTrace().with("cutoff", "infinity");
  62             recording.start();
  63             // It's hard to get a larger number of samples without running into OOM
  64             // since the TLAB size increases when there is more allocation.
  65             // Allocate 200 MB, which should give at least 400 samples if the TLAB
  66             // size manages to stay below 512kb, which logging with -Xlog:gc+tlab=trace indicates.
  67             for (int i = 0; i < OBJECT_COUNT; i++) {
  68                 leak.add(new byte[20_000]);
  69             }
  70             recording.stop();
  71             List<RecordedEvent> events = Events.fromRecording(recording);
  72             System.out.println("Found samples: " + events.size());
  73             if (amount.equals("off")) {
  74                 if (!events.isEmpty()) {
  75                     throw new Exception("No objects shuld be emitted when queue size 0");
  76                 }
  77             }
  78             if (amount.equals("many")) {
  79                 // Sanity check that we at least have managed to set a value above the default
  80                 if (events.size() <= DEFAULT_OLD_OBJECT_QUEUE_SIZE) {
  81                     throw new Exception("Should be at least be " + DEFAULT_OLD_OBJECT_QUEUE_SIZE + ", but found " + events.size());
  82                 }
  83             }
  84         }
  85     }
  86 }