diff -r 848a2f381e2c -r cb8e16d6ff1e src/hotspot/share/jfr/utilities/jfrTypes.hpp
--- a/src/hotspot/share/jfr/utilities/jfrTypes.hpp	Tue Apr 23 14:56:39 2019 -0700
+++ b/src/hotspot/share/jfr/utilities/jfrTypes.hpp	Wed Apr 24 17:09:24 2019 +0900
@@ -33,6 +33,9 @@
 typedef int fio_fd;
 const int invalid_fd = -1;
 const jlong invalid_offset = -1;
+const u4 STACK_DEPTH_DEFAULT = 64;
+const u4 MIN_STACK_DEPTH = 1;
+const u4 MAX_STACK_DEPTH = 2048;
 
 enum EventStartTime {
   UNTIMED,