--- old/src/jdk.jfr/share/conf/jfr/default.jfc	2020-03-08 23:34:12.893359451 +0800
+++ new/src/jdk.jfr/share/conf/jfr/default.jfc	2020-03-08 23:34:12.757354485 +0800
@@ -731,6 +731,10 @@
       <setting name="stackTrace">true</setting>  
     </event>
 
+    <event name="jdk.DirectMemoryStatistics">
+      <setting name="enabled">true</setting>
+      <setting name="period">5 s</setting>
+    </event>