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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).
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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 import jdk.test.lib.jfr.GCHelper;
37 
38 /**
39  * @test
40  * @bug 8149650
41  *
42  *
43  * @key jfr
44  * @library /lib /
45  * @run main/othervm -XX:NewSize=2m -XX:MaxNewSize=2m -Xmx32m -XX:G1HeapRegionSize=1m -XX:+UseG1GC jdk.jfr.event.gc.detailed.TestG1HeapRegionTypeChangeEvent
46  */
47 
48 public class TestG1HeapRegionTypeChangeEvent {
49     private final static String EVENT_NAME = EventNames.G1HeapRegionTypeChange;
50 
main(String[] args)51     public static void main(String[] args) throws Exception {
52         Recording recording = null;
53         try {
54             recording = new Recording();
55             // activate the event we are interested in and start recording
56             recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
57             recording.start();
58 
59             // Setting NewSize and MaxNewSize will limit eden, so
60             // allocating 1024 20k byte arrays should trigger at
61             // least a few Young GCs.
62             byte[][] array = new byte[1024][];
63             for (int i = 0; i < array.length; i++) {
64                 array[i] = new byte[20 * 1024];
65             }
66             recording.stop();
67 
68             // Verify recording
69             List<RecordedEvent> events = Events.fromRecording(recording);
70             Asserts.assertFalse(events.isEmpty(), "No events found");
71 
72             for (RecordedEvent event : events) {
73                 Events.assertField(event, "index").notEqual(-1);
74                 Asserts.assertTrue(GCHelper.isValidG1HeapRegionType(Events.assertField(event, "from").getValue()));
75                 Asserts.assertTrue(GCHelper.isValidG1HeapRegionType(Events.assertField(event, "to").getValue()));
76                 Events.assertField(event, "used").atMost(1L*1024*1024);
77             }
78         } catch (Throwable t) {
79             if (recording != null) {
80                 recording.dump(Paths.get("TestG1HeapRegionTypeChangeEvent.jfr"));
81             }
82             throw t;
83         } finally {
84             if (recording != null) {
85                 recording.close();
86             }
87         }
88     }
89 }
90