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

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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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
 * @library /test/lib /test/jdk
 * @modules jdk.jfr/jdk.jfr.internal.test
 * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestThreadLocalLeak
 */
public class TestThreadLocalLeak {

    private static ThreadLocal<List<ThreadLocalObject[]>> threadLocal = new ThreadLocal<List<ThreadLocalObject[]>>() {
        @Override
        public List<ThreadLocalObject[]> initialValue() {
            return new ArrayList<ThreadLocalObject[]>(OldObjects.MIN_SIZE);
        }
    };

    static class ThreadLocalObject {
    }

    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();
            allocateThreadLocal();
            r.stop();
            List<RecordedEvent> events = Events.fromRecording(r);
            if (OldObjects.countMatchingEvents(events, ThreadLocalObject[].class, null, null, -1, "allocateThreadLocal") == 0) {
                throw new Exception("Could not find thread local object " + ThreadLocalObject.class);
            }
        }
    }

    private static void allocateThreadLocal() {
        for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
            // Allocate array to trigger sampling code path for interpreter / c1
            threadLocal.get().add(new ThreadLocalObject[0]);
        }
    }

}