diff -r f078cdefa674 -r 12998f95a334 hotspot/src/share/vm/memory/heap.hpp
--- a/hotspot/src/share/vm/memory/heap.hpp	Tue Dec 28 17:34:02 2010 -0800
+++ b/hotspot/src/share/vm/memory/heap.hpp	Wed Dec 29 10:41:43 2010 -0800
@@ -161,6 +161,7 @@
   size_t max_capacity() const;
   size_t allocated_capacity() const;
   size_t unallocated_capacity() const            { return max_capacity() - allocated_capacity(); }
+  size_t largest_free_block() const;
 
   // Debugging
   void verify();