--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2014-07-10 11:11:03.988993217 +0200
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2014-07-10 11:11:03.909990931 +0200
@@ -1161,16 +1161,16 @@
   uint n_regions() const { return _hrs.length(); }
 
   // The max number of regions in the heap.
-  uint max_regions() { return _hrs.max_length(); }
+  uint max_regions() const { return _hrs.max_length(); }
 
   // The number of regions that are completely free.
-  uint free_regions() { return _free_list.length(); }
+  uint free_regions() const { return _free_list.length(); }
 
   // The number of regions that are not completely free.
-  uint used_regions() { return n_regions() - free_regions(); }
+  uint used_regions() const { return n_regions() - free_regions(); }
 
   // The number of regions available for "regular" expansion.
-  uint expansion_regions() { return _expansion_regions; }
+  uint expansion_regions() const { return _expansion_regions; }
 
   // Factory method for HeapRegion instances. It will return NULL if
   // the allocation fails.