1 /*
   2  * Copyright (c) 2020, 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.detailed;
  27 
  28 import java.time.Duration;
  29 import java.util.List;
  30 
  31 import static gc.testlibrary.Allocation.blackHole;
  32 import jdk.jfr.Recording;
  33 import jdk.jfr.consumer.RecordedEvent;
  34 import jdk.test.lib.jfr.EventNames;
  35 import jdk.test.lib.jfr.Events;
  36 
  37 /**
  38  * @test TestZAllocationStallEvent
  39  * @requires vm.hasJFR & vm.gc.Z
  40  * @key jfr
  41  * @library /test/lib /test/jdk /test/hotspot/jtreg
  42  * @run main/othervm -XX:+UseZGC -Xmx32M jdk.jfr.event.gc.detailed.TestZAllocationStallEvent
  43  */
  44 
  45 public class TestZAllocationStallEvent {
  46     public static void main(String[] args) throws Exception {
  47         try (Recording recording = new Recording()) {
  48             // Activate the event we are interested in and start recording
  49             recording.enable(EventNames.ZAllocationStall).withThreshold(Duration.ofMillis(0));
  50             recording.start();
  51 
  52             // Allocate objects many large objects quickly, to out run the GC
  53             for (int i = 0; i < 100; i++) {
  54                 blackHole(new byte[16 * 1024 * 1024]);
  55             }
  56 
  57             recording.stop();
  58 
  59             // Verify recording
  60             List<RecordedEvent> events = Events.fromRecording(recording);
  61             System.out.println("Events: " + events.size());
  62             Events.hasEvents(events);
  63         }
  64     }
  65 }