--- old/src/share/vm/runtime/os.hpp	2013-09-03 10:50:43.684798312 +0200
+++ new/src/share/vm/runtime/os.hpp	2013-09-03 10:50:43.576798315 +0200
@@ -137,7 +137,10 @@
 
  public:
   static void init(void);                      // Called before command line parsing
+  static void init_ergo(void);                 // Called after command line parsing
+                                               // before VM ergonomics processing.
   static jint init_2(void);                    // Called after command line parsing
+                                               // and VM ergonomics processing
   static void init_globals(void) {             // Called from init_globals() in init.cpp
     init_globals_ext();
   }
@@ -252,6 +255,11 @@
   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 that can be 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