diff -r 84ef29ccac56 -r 00860d9caf4d src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointWriter.hpp
--- a/src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointWriter.hpp	Fri Aug 23 18:47:55 2019 +0200
+++ b/src/hotspot/share/jfr/recorder/checkpoint/jfrCheckpointWriter.hpp	Sat Aug 24 14:30:27 2019 +0200
@@ -54,24 +54,23 @@
 };
 
 class JfrCheckpointWriter : public JfrCheckpointWriterBase {
+  friend class JfrCheckpointManager;
   friend class JfrSerializerRegistration;
  private:
   JfrTicks _time;
   int64_t _offset;
   u4 _count;
-  bool _flushpoint;
   bool _header;
 
   u4 count() const;
   void set_count(u4 count);
   void increment();
-  void set_flushpoint(bool flushpoint);
-  bool is_flushpoint() const;
-  const u1* session_data(size_t* size, const JfrCheckpointContext* ctx = NULL);
+  const u1* session_data(size_t* size, bool move = false, const JfrCheckpointContext* ctx = NULL);
   void release();
-
+  JfrCheckpointWriter(Thread* t, JfrBuffer* buffer);
  public:
-  JfrCheckpointWriter(bool flushpoint, bool header, Thread* thread);
+  JfrCheckpointWriter();
+  JfrCheckpointWriter(Thread* t, bool header = true);
   ~JfrCheckpointWriter();
   void write_type(JfrTypeId type_id);
   void write_count(u4 nof_entries);
@@ -80,7 +79,6 @@
   const JfrCheckpointContext context() const;
   void set_context(const JfrCheckpointContext ctx);
   bool has_data() const;
-  JfrCheckpointBlobHandle checkpoint_blob();
   JfrCheckpointBlobHandle copy(const JfrCheckpointContext* ctx = NULL);
   JfrCheckpointBlobHandle move(const JfrCheckpointContext* ctx = NULL);
 };