--- old/src/share/vm/runtime/thread.hpp	2014-10-28 14:49:24.293401285 +0100
+++ new/src/share/vm/runtime/thread.hpp	2014-10-28 14:49:24.221400929 +0100
@@ -1767,6 +1767,9 @@
     _scanned_nmethod = nm;
   }
 
+  // Hide sweeper thread from external view.
+  bool is_hidden_from_external_view() const { return true; }
+
   bool is_Code_cache_sweeper_thread() const { return true; }
   // GC support
   // Apply "f->do_oop" to all root oops in "this".