--- old/src/share/vm/runtime/os.hpp	2014-12-17 15:01:51.575113387 +0100
+++ new/src/share/vm/runtime/os.hpp	2014-12-17 15:01:51.505111371 +0100
@@ -311,6 +311,12 @@
   static bool   uncommit_memory(char* addr, size_t bytes);
   static bool   release_memory(char* addr, size_t bytes);
 
+  // Touch memory pages from start to end to make the OS back the memory range
+  // with actual memory.
+  // Assumes that start and end are suitably aligned, otherwise it may fail to
+  // touch the page containing end.
+  static void   pretouch_memory(char* start, char* end);
+
   enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
   static bool   protect_memory(char* addr, size_t bytes, ProtType prot,
                                bool is_committed = true);