diff -r 9bf46d16dcc6 -r a29022212180 hotspot/src/share/vm/gc_implementation/shared/mutableSpace.hpp
--- a/hotspot/src/share/vm/gc_implementation/shared/mutableSpace.hpp	Thu Jan 23 14:47:23 2014 +0100
+++ b/hotspot/src/share/vm/gc_implementation/shared/mutableSpace.hpp	Mon Jan 27 13:14:53 2014 +0100
@@ -124,6 +124,7 @@
   virtual size_t used_in_words() const                    { return pointer_delta(top(), bottom()); }
   virtual size_t free_in_words() const                    { return pointer_delta(end(),    top()); }
   virtual size_t tlab_capacity(Thread* thr) const         { return capacity_in_bytes();            }
+  virtual size_t tlab_used(Thread* thr) const             { return used_in_bytes();                }
   virtual size_t unsafe_max_tlab_alloc(Thread* thr) const { return free_in_bytes();                }
 
   // Allocation (return NULL if full)