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 }