1 /* 2 * Copyright (c) 2015, 2019, 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 package jdk.jfr.event.oldobject; 26 27 import java.util.List; 28 29 import jdk.jfr.Recording; 30 import jdk.jfr.consumer.RecordedEvent; 31 import jdk.jfr.internal.test.WhiteBox; 32 import jdk.testlibrary.jfr.EventNames; 33 import jdk.testlibrary.jfr.Events; 34 import jdk.testlibrary.jfr.OldObjects; 35 36 /* 37 * @test 38 * @key jfr 39 * @requires vm.gc == "null" 40 * @library /lib/testlibrary 41 * @modules jdk.jfr/jdk.jfr.internal.test 42 * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestReferenceChainLimit 43 */ 44 public class TestReferenceChainLimit { 45 private final static int TEST_CHAIN_LENGTH_FACTOR = 10; // scaling factor for the how long chain to be used in the test 46 47 final static class ChainNode { 48 final ChainNode next; 49 byte[] leak; 50 51 public ChainNode(ChainNode node) { 52 next = node; 53 leak = new byte[10_000]; 54 } 55 } 56 57 private static ChainNode createChain() { 58 ChainNode node = null; 59 final int testChainLength = OldObjects.MAX_CHAIN_LENGTH * TEST_CHAIN_LENGTH_FACTOR; 60 for (int i = 0; i < testChainLength; i++) { 61 node = new ChainNode(node); 62 } 63 return node; 64 } 65 66 public static ChainNode leak; 67 68 public static void main(String[] args) throws Exception { 69 WhiteBox.setWriteAllObjectSamples(true); 70 71 try (Recording r = new Recording()) { 72 r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity"); 73 r.start(); 74 leak = createChain(); 75 List<RecordedEvent> events = Events.fromRecording(r); 76 if (OldObjects.countMatchingEvents(events, byte[].class, null, null, -1, "createChain") == 0) { 77 throw new Exception("Could not find ChainNode"); 78 } 79 for (RecordedEvent e : events) { 80 OldObjects.validateReferenceChainLimit(e, OldObjects.MAX_CHAIN_LENGTH); 81 } 82 } 83 } 84 }