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.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.testlibrary.Asserts; 38 import jdk.testlibrary.jfr.EventNames; 39 import jdk.testlibrary.jfr.Events; 40 import jdk.testlibrary.jfr.OldObjects; 41 42 /* 43 * @test 44 * @key jfr 45 * @requires vm.gc == "null" 46 * @library /lib/testlibrary 47 * @modules jdk.jfr/jdk.jfr.internal.test 48 * @run main/othervm -XX:TLABSize=2k -XX:-FastTLABRefill jdk.jfr.event.oldobject.TestLargeRootSet 49 */ 50 public class TestLargeRootSet { 51 52 private static final int THREAD_COUNT = 50; 53 54 private static class RootThread extends Thread { 55 private final CyclicBarrier barrier; 56 private int maxDepth = OldObjects.MIN_SIZE / THREAD_COUNT; 57 58 public List<StackObject[]> temporaries = new ArrayList<>(maxDepth); 59 60 RootThread(CyclicBarrier cb) { 61 this.barrier = cb; 62 } 63 64 public void run() { 65 buildRootObjects(); 66 } 67 68 private void buildRootObjects() { 69 if (maxDepth-- > 0) { 70 // Allocate array to trigger sampling code path for interpreter / c1 71 StackObject[] stackObject = new StackObject[0]; 72 temporaries.add(stackObject); // make sure object escapes 73 buildRootObjects(); 74 } else { 75 temporaries.clear(); 76 try { 77 barrier.await(); // wait for gc 78 barrier.await(); // wait for recording to be stopped 79 } catch (InterruptedException e) { 80 System.err.println("Thread was unexpected interrupted: " + e.getMessage()); 81 } catch (BrokenBarrierException e) { 82 System.err.println("Unexpected barrier exception: " + e.getMessage()); 83 } 84 return; 85 } 86 } 87 } 88 89 private static class StackObject { 90 } 91 92 public static void main(String[] args) throws Exception { 93 WhiteBox.setWriteAllObjectSamples(true); 94 95 List<RootThread> threads = new ArrayList<>(); 96 try (Recording r = new Recording()) { 97 r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity"); 98 r.start(); 99 CyclicBarrier cb = new CyclicBarrier(THREAD_COUNT + 1); 100 for (int i = 0; i < THREAD_COUNT; i++) { 101 RootThread t = new RootThread(cb); 102 t.start(); 103 if (i % 10 == 0) { 104 // Give threads some breathing room before starting next batch 105 Thread.sleep(100); 106 } 107 threads.add(t); 108 } 109 cb.await(); 110 System.gc(); 111 r.stop(); 112 cb.await(); 113 List<RecordedEvent> events = Events.fromRecording(r); 114 Events.hasEvents(events); 115 for (RecordedEvent e : events) { 116 RecordedObject ro = e.getValue("object"); 117 RecordedClass rc = ro.getValue("type"); 118 System.out.println(rc.getName()); 119 if (rc.getName().equals(StackObject[].class.getName())) { 120 return; // ok 121 } 122 } 123 Asserts.fail("Could not find root object"); 124 } 125 } 126 } 127