--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/test/jdk/jdk/jfr/event/runtime/TestDirectMemoryStatisticsEvent.java	2020-03-13 22:36:17.221644307 +0800
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2020, 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.runtime;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+
+import jdk.internal.misc.VM;
+
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.test.lib.Asserts;
+import jdk.test.lib.jfr.EventNames;
+import jdk.test.lib.jfr.Events;
+
+/**
+ * @test
+ * @key jfr
+ * @requires vm.hasJFR
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * @run main/othervm -XX:MaxDirectMemorySize=128m jdk.jfr.event.runtime.TestDirectMemoryStatisticsEvent
+ * @run main/othervm jdk.jfr.event.runtime.TestDirectMemoryStatisticsEvent
+ */
+public class TestDirectMemoryStatisticsEvent {
+
+    private static final String EVENT_PATH = EventNames.DirectMemoryStatistics;
+
+    public static void main(String[] args) throws Throwable {
+        try (Recording recording = new Recording()) {
+            recording.enable(EVENT_PATH);
+            recording.start();
+            int rounds = 16;
+            int size = 1 * 1024 * 1024; // 1M
+            for (int i = 0; i < rounds; i++) {
+                ByteBuffer.allocateDirect(size);
+            }
+            recording.stop();
+
+            List<RecordedEvent> events = Events.fromRecording(recording);
+            Events.hasEvents(events);
+
+            long count = 0;
+            long totalCapacity = 0;
+            long memoryUsed = 0;
+
+            for (RecordedEvent event : events) {
+                System.out.println(event);
+                Asserts.assertTrue(Events.isEventType(event, EVENT_PATH), "Wrong event type");
+                count = Math.max(count, Events.assertField(event, "count").getValue());
+                totalCapacity = Math.max(totalCapacity, Events.assertField(event, "totalCapacity").getValue());
+                memoryUsed = Math.max(memoryUsed, Events.assertField(event, "memoryUsed").getValue());
+                Asserts.assertEquals(VM.maxDirectMemory(), Events.assertField(event, "maxCapacity").getValue());
+            }
+
+            Asserts.assertGreaterThanOrEqual(count, (long)rounds, "Too few count in statistics event");
+            Asserts.assertGreaterThanOrEqual(totalCapacity, (long)(rounds * size), "Too few totalCapacity in statistics event");
+            Asserts.assertGreaterThanOrEqual(memoryUsed, totalCapacity, "Too few memoryUsed in statistics event");
+        }
+    }
+}