--- /dev/null	2020-01-02 04:43:18.583999853 +0000
+++ new/test/jdk/jfr/event/oldobject/TestLastKnownHeapUsage.java	2020-01-30 06:34:40.918876427 +0000
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * 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,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.jfr.event.oldobject;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.jfr.consumer.RecordingFile;
+import jdk.jfr.internal.test.WhiteBox;
+import jdk.test.lib.jfr.EventNames;
+import jdk.test.lib.jfr.Events;
+
+/**
+ * @test
+ * @key jfr
+ *
+ *
+ * @library /lib /
+ *
+ * @run main/othervm -XX:TLABSize=2k -XX:-FastTLABRefill jdk.jfr.event.oldobject.TestLastKnownHeapUsage
+ */
+public class TestLastKnownHeapUsage {
+
+    public final static List<Object> heap = new ArrayList<>();
+
+    public static void main(String[] args) throws Exception {
+        WhiteBox.setWriteAllObjectSamples(true);
+        long last = 0;
+        for (int i = 1; i <= 5; i++) {
+            long heapUsage = recordOldObjects(i);
+            System.out.println("Recording: " + i + " heapUsage=" + heapUsage);
+            if (heapUsage < last) {
+                throw new Exception("Unexpect decrease of heap usage");
+            }
+        }
+    }
+
+    private static long recordOldObjects(int index) throws IOException {
+        try (Recording r = new Recording()) {
+            r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
+            r.start();
+            System.gc();
+            for (int i = 0; i < 20; i++) {
+                heap.add(new byte[1_000_000]);
+            }
+            System.gc();
+            r.stop();
+            Path p = Paths.get("recording-" + index + ".jfr");
+            r.dump(p);
+            List<RecordedEvent> events = RecordingFile.readAllEvents(p);
+            Events.hasEvents(events);
+            long max = 0;
+            for (RecordedEvent e : RecordingFile.readAllEvents(p)) {
+                long heapUsage = Events.assertField(e, "lastKnownHeapUsage").atLeast(0L).below(1_000_000_000L).getValue();
+                max = Math.max(max, heapUsage);
+            }
+            return max;
+        }
+    }
+}