--- /dev/null 2020-02-26 11:26:53.000000000 +0100 +++ new/test/jdk/jdk/jfr/event/gc/collection/TestSystemGc.java 2020-02-26 11:26:51.426623000 +0100 @@ -0,0 +1,74 @@ +/* + * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +package jdk.jfr.event.gc.collection; + +import java.lang.management.ManagementFactory; +import java.util.List; + +import jdk.jfr.Recording; +import jdk.jfr.consumer.RecordedEvent; +import jdk.test.lib.Asserts; +import jdk.test.lib.jfr.EventNames; +import jdk.test.lib.jfr.Events; + +/** + * @test + * @key jfr + * @requires vm.hasJFR + * @library /test/lib /test/jdk + * @run main/othervm jdk.jfr.event.gc.collection.TestSystemGC + */ +public class TestSystemGC { + public static void main(String[] args) throws Exception { + try (Recording recording = new Recording()) { + recording.enable(EventNames.SystemGC); + recording.start(); + + // Trigger 3 System GC + System.gc(); + ManagementFactory.getMemoryMXBean().gc(); + Runtime.getRuntime().gc(); + + recording.stop(); + List events = Events.fromRecording(recording); + System.out.println(events); + + Asserts.assertEquals(3, events.size(), "Expected 3 SystemGC events"); + + RecordedEvent event1 = events.get(0); + Events.assertFrame(event1, System.class, "gc"); + Events.assertEventThread(event1, Thread.currentThread()); + + RecordedEvent event2 = events.get(1); + Events.assertFrame(event2, Runtime.class, "gc"); + Events.assertEventThread(event2, Thread.currentThread()); + + RecordedEvent event3 = events.get(2); + // MemoryMXBean.class is an interface so can't assertFrame on it + Events.assertEventThread(event3, Thread.currentThread()); + } + } +}