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25 package jdk.jfr.event.gc.detailed;
26 
27 import java.nio.file.Paths;
28 import java.time.Duration;
29 import java.util.List;
30 
31 import jdk.jfr.Recording;
32 import jdk.jfr.consumer.RecordedEvent;
33 import jdk.test.lib.Asserts;
34 import jdk.test.lib.jfr.EventNames;
35 import jdk.test.lib.jfr.Events;
36 
37 /**
38  * @test
39  * @bug 8009538
40  * @requires vm.hasJFR
41  * @requires vm.gc == "G1" | vm.gc == null
42  * @key jfr
43  * @library /test/lib /test/jdk
44  * @run main/othervm -XX:NewSize=2m -XX:MaxNewSize=2m -Xmx32m -XX:+UseG1GC -XX:+NeverTenure jdk.jfr.event.gc.detailed.TestTenuringDistributionEvent
45  */
46 
47 public class TestTenuringDistributionEvent {
48     private final static String EVENT_NAME = EventNames.TenuringDistribution;
49 
main(String[] args)50     public static void main(String[] args) throws Exception {
51         Recording recording = null;
52         try {
53             recording = new Recording();
54             // activate the event we are interested in and start recording
55             recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
56             recording.start();
57 
58             // Setting NewSize and MaxNewSize will limit eden, so
59             // allocating 1024 20k byte arrays should trigger at
60             // least a few Young GCs.
61             byte[][] array = new byte[1024][];
62             for (int i = 0; i < array.length; i++) {
63                 array[i] = new byte[20 * 1024];
64             }
65             recording.stop();
66 
67             // Verify recording
68             List<RecordedEvent> events = Events.fromRecording(recording);
69             Asserts.assertFalse(events.isEmpty(), "No events found");
70             for (RecordedEvent event : events) {
71                 Events.assertField(event, "gcId").notEqual(-1);
72                 Events.assertField(event, "age").notEqual(0);
73                 Events.assertField(event, "size").atLeast(0L);
74             }
75 
76         } catch (Throwable t) {
77             if (recording != null) {
78                 recording.dump(Paths.get("TestTenuringDistribution.jfr"));
79             }
80             throw t;
81         } finally {
82             if (recording != null) {
83                 recording.close();
84             }
85         }
86     }
87 }
88