--- old/src/hotspot/share/gc/g1/g1IHOPControl.hpp	2020-06-10 10:12:05.985079397 +0200
+++ new/src/hotspot/share/gc/g1/g1IHOPControl.hpp	2020-06-10 10:12:05.897076376 +0200
@@ -63,14 +63,15 @@
   // Adjust target occupancy.
   virtual void update_target_occupancy(size_t new_target_occupancy);
   // Update information about time during which allocations in the Java heap occurred,
-  // how large these allocations were in bytes, and an additional buffer.
+  // and how large these allocations were in bytes.
   // The allocations should contain any amount of space made unusable for further
   // allocation, e.g. any waste caused by TLAB allocation, space at the end of
   // humongous objects that can not be used for allocation, etc.
   // Together with the target occupancy, this additional buffer should contain the
   // difference between old gen size and total heap size at the start of reclamation,
   // and space required for that reclamation.
-  virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size);
+  virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes);
+  virtual void update_additional_buffer(size_t additional_buffer_bytes) { }
   // Update the time spent in the mutator beginning from the end of initial mark to
   // the first mixed gc.
   virtual void update_marking_length(double marking_length_s) = 0;
@@ -140,9 +141,11 @@
                         size_t heap_reserve_percent, // The percentage of total heap capacity that should not be tapped into.
                         size_t heap_waste_percent);  // The percentage of the free space in the heap that we think is not usable for allocation.
 
+  virtual void update_target_occupancy(size_t new_target_occupancy);
   virtual size_t get_conc_mark_start_threshold();
 
-  virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size);
+  virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes);
+  virtual void update_additional_buffer(size_t additional_buffer_bytes);
   virtual void update_marking_length(double marking_length_s);
 
   virtual void print();