test/jdk/jdk/jfr/event/oldobject/TestSerial.java

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package jdk.jfr.event.oldobject;

import java.util.ArrayList;
import java.util.List;

import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.internal.test.WhiteBox;
import jdk.test.lib.jfr.EventNames;
import jdk.test.lib.jfr.Events;

/**
 * @test
 * @key jfr
 * @requires vm.hasJFR
 * @requires vm.gc == "null"
 * @summary Test leak profiler with Serial GC
 * @library /test/lib /test/jdk
 * @modules jdk.jfr/jdk.jfr.internal.test
 * @run main/othervm  -XX:TLABSize=2k -XX:+UseSerialGC jdk.jfr.event.oldobject.TestSerial
 */
public class TestSerial {

    static private class FindMe {
    }

    public static List<FindMe[]> list = new ArrayList<>(OldObjects.MIN_SIZE);

    public static void main(String[] args) throws Exception {
        WhiteBox.setWriteAllObjectSamples(true);

        try (Recording r = new Recording()) {
            r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
            r.start();
            allocateFindMe();
            System.gc();
            r.stop();
            List<RecordedEvent> events = Events.fromRecording(r);
            System.out.println(events);
            if (OldObjects.countMatchingEvents(events, FindMe[].class, null, null, -1, "allocateFindMe") == 0) {
                throw new Exception("Could not find leak with " + FindMe[].class);
            }
        }
    }

    public static void allocateFindMe() {
        for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
            // Allocate array to trigger sampling code path for interpreter / c1
            list.add(new FindMe[0]);
        }
    }

}