diff -r d61c4c63f619 -r 3a82a58d9aa9 hotspot/src/share/vm/memory/metaspace.hpp
--- a/hotspot/src/share/vm/memory/metaspace.hpp	Thu Apr 18 06:50:35 2013 +0200
+++ b/hotspot/src/share/vm/memory/metaspace.hpp	Fri Mar 01 10:19:29 2013 -0800
@@ -150,6 +150,9 @@
   static bool contains(const void *ptr);
   void dump(outputStream* const out) const;
 
+  // Free empty virtualspaces
+  static void purge();
+
   void print_on(outputStream* st) const;
   // Debugging support
   void verify();