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25 
26 package jdk.jfr.event.oldobject;
27 
28 import java.util.ArrayList;
29 import java.util.List;
30 
31 import jdk.jfr.Recording;
32 import jdk.jfr.consumer.RecordedEvent;
33 import jdk.jfr.internal.test.WhiteBox;
34 import jdk.test.lib.jfr.EventNames;
35 import jdk.test.lib.jfr.Events;
36 
37 /**
38  * @test
39  * @key jfr
40  *
41  * @library /lib /
42  *
43  * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestThreadLocalLeak
44  */
45 public class TestThreadLocalLeak {
46 
47     private static ThreadLocal<List<ThreadLocalObject[]>> threadLocal = new ThreadLocal<List<ThreadLocalObject[]>>() {
48         @Override
49         public List<ThreadLocalObject[]> initialValue() {
50             return new ArrayList<ThreadLocalObject[]>(OldObjects.MIN_SIZE);
51         }
52     };
53 
54     static class ThreadLocalObject {
55     }
56 
main(String[] args)57     public static void main(String[] args) throws Exception {
58         WhiteBox.setWriteAllObjectSamples(true);
59 
60         try (Recording r = new Recording()) {
61             r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
62             r.start();
63             allocateThreadLocal();
64             r.stop();
65             List<RecordedEvent> events = Events.fromRecording(r);
66             if (OldObjects.countMatchingEvents(events, ThreadLocalObject[].class, null, null, -1, "allocateThreadLocal") == 0) {
67                 throw new Exception("Could not find thread local object " + ThreadLocalObject.class);
68             }
69         }
70     }
71 
allocateThreadLocal()72     private static void allocateThreadLocal() {
73         for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
74             // Allocate array to trigger sampling code path for interpreter / c1
75             threadLocal.get().add(new ThreadLocalObject[0]);
76         }
77     }
78 
79 }
80