--- old/src/hotspot/share/gc/g1/g1Analytics.hpp	2019-12-04 15:38:56.562626484 +0100
+++ new/src/hotspot/share/gc/g1/g1Analytics.hpp	2019-12-04 15:38:56.354624895 +0100
@@ -75,6 +75,8 @@
   // Statistics kept per GC stoppage, pause or full.
   TruncatedSeq* _recent_prev_end_times_for_all_gcs_sec;
 
+  TruncatedSeq* _survivor_ratio;
+
   // The ratio of gc time to elapsed time, computed over recent pauses,
   // and the ratio for just the last pause.
   double _recent_avg_pause_time_ratio;
@@ -126,6 +128,7 @@
   void report_constant_other_time_ms(double constant_other_time_ms);
   void report_pending_cards(double pending_cards);
   void report_rs_length(double rs_length);
+  void report_survivor_ratio(double ratio);
 
   double predict_alloc_rate_ms() const;
   int num_alloc_rate_ms() const;
@@ -158,6 +161,8 @@
   size_t predict_rs_length() const;
   size_t predict_pending_cards() const;
 
+  double predict_survivor_ratio() const;  
+
   // Add a new GC of the given duration and end time to the record.
   void update_recent_gc_times(double end_time_sec, double elapsed_ms);
   void compute_pause_time_ratio(double interval_ms, double pause_time_ms);