1 /* 2 * Copyright (c) 2015, 2018, 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.ArrayList; 28 import java.util.List; 29 import java.util.concurrent.BrokenBarrierException; 30 import java.util.concurrent.CyclicBarrier; 31 32 import jdk.jfr.Recording; 33 import jdk.jfr.consumer.RecordedClass; 34 import jdk.jfr.consumer.RecordedEvent; 35 import jdk.jfr.consumer.RecordedObject; 36 import jdk.jfr.internal.test.WhiteBox; 37 import jdk.test.lib.Asserts; 38 import jdk.test.lib.jfr.EventNames; 39 import jdk.test.lib.jfr.Events; 40 41 /* 42 * @test 43 * @key jfr 44 * @requires vm.gc == "null" 45 * @library /test/lib /test/jdk 46 * @modules jdk.jfr/jdk.jfr.internal.test 47 * @run main/othervm -XX:TLABSize=2k -XX:-FastTLABRefill jdk.jfr.event.oldobject.TestLargeRootSet 48 */ 49 public class TestLargeRootSet { 50 51 private static final int THREAD_COUNT = 50; 52 53 private static class RootThread extends Thread { 54 private final CyclicBarrier barrier; 55 private int maxDepth = OldObjects.MIN_SIZE / THREAD_COUNT; 56 57 public List<StackObject[]> temporaries = new ArrayList<>(maxDepth); 58 59 RootThread(CyclicBarrier cb) { 60 this.barrier = cb; 61 } 62 63 public void run() { 64 buildRootObjects(); 65 } 66 67 private void buildRootObjects() { 68 if (maxDepth-- > 0) { 69 // Allocate array to trigger sampling code path for interpreter / c1 70 StackObject[] stackObject = new StackObject[0]; 71 temporaries.add(stackObject); // make sure object escapes 72 buildRootObjects(); 73 } else { 74 temporaries.clear(); 75 try { 76 barrier.await(); // wait for gc 77 barrier.await(); // wait for recording to be stopped 78 } catch (InterruptedException e) { 79 System.err.println("Thread was unexpected interrupted: " + e.getMessage()); 80 } catch (BrokenBarrierException e) { 81 System.err.println("Unexpected barrier exception: " + e.getMessage()); 82 } 83 return; 84 } 85 } 86 } 87 88 private static class StackObject { 89 } 90 91 public static void main(String[] args) throws Exception { 92 WhiteBox.setWriteAllObjectSamples(true); 93 94 List<RootThread> threads = new ArrayList<>(); 95 try (Recording r = new Recording()) { 96 r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity"); 97 r.start(); 98 CyclicBarrier cb = new CyclicBarrier(THREAD_COUNT + 1); 99 for (int i = 0; i < THREAD_COUNT; i++) { 100 RootThread t = new RootThread(cb); 101 t.start(); 102 if (i % 10 == 0) { 103 // Give threads some breathing room before starting next batch 104 Thread.sleep(100); 105 } 106 threads.add(t); 107 } 108 cb.await(); 109 System.gc(); 110 r.stop(); 111 cb.await(); 112 List<RecordedEvent> events = Events.fromRecording(r); 113 Events.hasEvents(events); 114 for (RecordedEvent e : events) { 115 RecordedObject ro = e.getValue("object"); 116 RecordedClass rc = ro.getValue("type"); 117 System.out.println(rc.getName()); 118 if (rc.getName().equals(StackObject[].class.getName())) { 119 return; // ok 120 } 121 } 122 Asserts.fail("Could not find root object"); 123 } 124 } 125 } 126