diff -r 19d0b382f086 -r 657924d1e2ba src/hotspot/share/gc/shared/generation.hpp
--- a/src/hotspot/share/gc/shared/generation.hpp	Tue Jul 02 13:45:08 2019 +0200
+++ b/src/hotspot/share/gc/shared/generation.hpp	Wed Jul 03 14:33:40 2019 +0000
@@ -156,7 +156,6 @@
   virtual size_t capacity() const = 0;  // The maximum number of object bytes the
                                         // generation can currently hold.
   virtual size_t used() const = 0;      // The number of used bytes in the gen.
-  virtual size_t used_stable() const;   // The number of used bytes for memory monitoring tools.
   virtual size_t free() const = 0;      // The number of free bytes in the gen.
 
   // Support for java.lang.Runtime.maxMemory(); see CollectedHeap.