--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2014-07-07 12:19:11.730193292 +0200
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2014-07-07 12:19:11.652191021 +0200
@@ -1153,7 +1153,7 @@
   }
 
   // The total number of regions in the heap.
-  uint n_regions() { return _hrs.length(); }
+  uint n_regions() const { return _hrs.length(); }
 
   // The max number of regions in the heap.
   uint max_regions() { return _hrs.max_length(); }
@@ -1387,8 +1387,7 @@
   // As above but starting from region r
   void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk);
 
-  // Returns the first (lowest address) compactible space in the heap.
-  virtual CompactibleSpace* first_compactible_space();
+  HeapRegion* next_compaction_region(const HeapRegion* from) const;
 
   // A CollectedHeap will contain some number of spaces.  This finds the
   // space containing a given address, or else returns NULL.