test/jdk/jdk/jfr/event/oldobject/TestHeapDeep.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
 * @requires vm.gc == "null"
 * @library /test/lib /test/jdk
 * @modules jdk.jfr/jdk.jfr.internal.test
 * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestHeapDeep
 */
public class TestHeapDeep {

    final static class ChainNode {
        final ChainNode next;
        List<byte[]> leaks;

        public ChainNode(ChainNode node) {
            next = node;
        }
    }

    public static ChainNode leak;

    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();
            leak = createChain();
            List<RecordedEvent> events = Events.fromRecording(r);
            if (OldObjects.countMatchingEvents(events, byte[].class, null, null, -1, "createChain") == 0) {
                throw new Exception("Could not find ChainNode");
            }
            for (RecordedEvent e : events) {
                OldObjects.validateReferenceChainLimit(e, OldObjects.MAX_CHAIN_LENGTH);
            }
        }
    }

    private static ChainNode createChain() {
        ChainNode node = new ChainNode(null);
        node.leaks = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            // Allocate arrays to trigger sampling code path for interpreter / c1
            node.leaks.add(new byte[10_000]);
        }
        for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
            node = new ChainNode(node);
        }
        return node;
    }
}