test/jdk/jdk/jfr/event/oldobject/TestSanityDefault.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.test.lib.jfr.EventNames;
import jdk.test.lib.jfr.Events;

/*
 * @test
 * @key jfr
 * @requires vm.gc == "null"
 * @library /test/lib /test/jdk
 * @summary Purpose of this test is to run leak profiler without command line tweaks or WhiteBox hacks until we succeed
 * @run main/othervm jdk.jfr.event.oldobject.TestSanityDefault
 */
public class TestSanityDefault {

    static private class FindMe {
    }

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

    public static void main(String[] args) throws Exception {
        // Should not use WhiteBox API, we want to execute actual code paths

        // Trigger c2 compilation, so we get sample
        for (long i = 0; i < 100_000_000; i++) {
            allocateFindMe(true);
        }


        // It's hard to get samples with interpreter / C1 so loop until we do
        while (true) {
            try (Recording r = new Recording()) {
                r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
                r.start();
                allocateFindMe(false);
                System.gc();
                r.stop();
                List<RecordedEvent> events = Events.fromRecording(r);
                if (OldObjects.countMatchingEvents(events, FindMe.class, null, null, -1, "allocateFindMe") > 0) {
                    return;
                }
                // no events found, retry
            }
        }
    }

    public static void allocateFindMe(boolean doNothing) {
        if (doNothing) {
            return;
        }
        for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
            // Purposely don't allocate array, so we at least
            // in one old-object test check an ordinary object.
            list.add(new FindMe());
        }
    }
}