diff -r 9bf46d16dcc6 -r a29022212180 hotspot/src/share/vm/memory/genCollectedHeap.hpp
--- a/hotspot/src/share/vm/memory/genCollectedHeap.hpp	Thu Jan 23 14:47:23 2014 +0100
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.hpp	Mon Jan 27 13:14:53 2014 +0100
@@ -248,6 +248,7 @@
   // Section on TLAB's.
   virtual bool supports_tlab_allocation() const;
   virtual size_t tlab_capacity(Thread* thr) const;
+  virtual size_t tlab_used(Thread* thr) const;
   virtual size_t unsafe_max_tlab_alloc(Thread* thr) const;
   virtual HeapWord* allocate_new_tlab(size_t size);