--- a/src/hotspot/share/gc/shared/collectedHeap.hpp	Mon Oct 15 09:35:05 2018 -0700
+++ b/src/hotspot/share/gc/shared/collectedHeap.hpp	Wed Oct 10 23:05:15 2018 +0200
@@ -309,6 +309,8 @@
   }
 
   virtual void fill_with_dummy_object(HeapWord* start, HeapWord* end, bool zap);
+  virtual size_t min_dummy_object_size() const;
+  size_t tlab_alloc_reserve() const;
 
   // Return the address "addr" aligned by "alignment_in_bytes" if such
   // an address is below "end".  Return NULL otherwise.