--- /dev/null 2018-03-08 15:11:46.002676589 -0800 +++ new/test/hotspot/jtreg/serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorGCTest.java 2018-03-19 14:01:24.377578126 -0700 @@ -0,0 +1,61 @@ +/* + * Copyright (c) 2018, Google 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. + * + * 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 MyPackage; + +import java.util.List; + +/** + * @test + * @build Frame HeapMonitor + * @summary Verifies the default GC with the Heap Monitor event system. + * @compile HeapMonitorGCTest.java + * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorGCTest + */ + +/** + * This test is checking that various GCs work as intended: events are sent, forcing GC works, etc. + */ +public class HeapMonitorGCTest { + public static void main(String[] args) { + if (!HeapMonitor.eventStorageIsEmpty()) { + throw new RuntimeException("Statistics should be null to begin with."); + } + + HeapMonitor.enableSamplingRate(); + + List frameList = HeapMonitor.allocate(); + frameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorGCTest.java", 47)); + Frame[] frames = frameList.toArray(new Frame[0]); + + if (!HeapMonitor.obtainedEvents(frames)) { + throw new RuntimeException("No expected events were found."); + } + + HeapMonitor.forceGarbageCollection(); + + if (!HeapMonitor.garbageContains(frames)) { + throw new RuntimeException("Forcing GC did not work, not a single object was collected."); + } + } +}