--- a/src/hotspot/share/gc/shared/generation.hpp	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/hotspot/share/gc/shared/generation.hpp	Thu Oct 17 20:53:35 2019 +0100
@@ -156,6 +156,7 @@
   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.
@@ -300,7 +301,7 @@
   // word of "obj" may have been overwritten with a forwarding pointer, and
   // also taking care to copy the klass pointer *last*.  Returns the new
   // object if successful, or else NULL.
-  virtual oop par_promote(int thread_num, oop obj, markOop m, size_t word_sz);
+  virtual oop par_promote(int thread_num, oop obj, markWord m, size_t word_sz);
 
   // Informs the current generation that all par_promote_alloc's in the
   // collection have been completed; any supporting data structures can be