--- old/src/share/vm/runtime/os.hpp	2013-06-04 17:03:31.695740850 +0200
+++ new/src/share/vm/runtime/os.hpp	2013-06-04 17:03:31.511740845 +0200
@@ -238,6 +238,11 @@
   static size_t page_size_for_region(size_t region_min_size,
                                      size_t region_max_size,
                                      uint min_pages);
+  // return the largest page size used
+  static size_t max_page_size() {
+    // the _page_sizes array is sorted in descending order.
+    return _page_sizes[0];
+  }
 
   // Methods for tracing page sizes returned by the above method; enabled by
   // TracePageSizes.  The region_{min,max}_size parameters should be the values