--- /dev/null 2017-11-09 09:38:01.297999907 +0100 +++ new/test/jdk/jdk/jfr/event/oldobject/TestHeapShallow.java 2018-04-09 18:17:57.496630529 +0200 @@ -0,0 +1,82 @@ +/* + * Copyright (c) 2018, 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.oldobject; + +import java.util.ArrayList; +import java.util.List; + +import jdk.jfr.Recording; +import jdk.jfr.internal.test.WhiteBox; +import jdk.test.lib.jfr.EventNames; + +/* + * @test + * @key jfr + * @requires vm.gc == "null" + * @library /test/lib /test/jdk + * @modules jdk.jfr/jdk.jfr.internal.test + * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestHeapShallow + */ +public class TestHeapShallow { + private final static long LARGE_OBJECT_FACTOR = 509; // prime number + + static class LeakObject { + Object object = null; + + public LeakObject(Object object) { + this.object = object; + } + } + + public static ArrayList leak = new ArrayList<>(OldObjects.MIN_SIZE); + + public static void main(String[] args) throws Exception { + WhiteBox.setWriteAllObjectSamples(true); + + try (Recording recording = new Recording()) { + recording.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity"); + recording.start(); + + addObjectsToShallowArray(leak); + recording.stop(); + if (OldObjects.countMatchingEvents(recording, "addObjectsToShallowArray", byte[].class, "object", LeakObject.class, -1) < 1) { + throw new Exception("Could not find shallow leak object"); + } + } + } + + private static void addObjectsToShallowArray(List list) { + for (int i = 0; i < OldObjects.MIN_SIZE; i++) { + if (i % LARGE_OBJECT_FACTOR == 0) { + // Triggers allocation outside TLAB path + list.add(new LeakObject(new byte[16384])); + } else { + // Triggers allocation in TLAB path + list.add(new LeakObject(new byte[10])); + } + } + } +}