diff -r 2c3cc4b01880 -r c16ac7a2eba4 src/hotspot/share/jfr/recorder/stringpool/jfrStringPool.hpp
--- a/src/hotspot/share/jfr/recorder/stringpool/jfrStringPool.hpp	Wed Oct 30 16:14:56 2019 +0100
+++ b/src/hotspot/share/jfr/recorder/stringpool/jfrStringPool.hpp	Wed Oct 30 19:43:52 2019 +0100
@@ -71,6 +71,7 @@
   static JfrStringPool* create(JfrChunkWriter& cw);
   bool initialize();
   static void destroy();
+  static bool is_modified();
 
   friend class JfrRecorder;
   friend class JfrRecorderService;