--- old/src/share/vm/runtime/os.hpp	2014-12-17 15:24:48.551472427 +0100
+++ new/src/share/vm/runtime/os.hpp	2014-12-17 15:24:48.482470441 +0100
@@ -311,6 +311,10 @@
   static bool   uncommit_memory(char* addr, size_t bytes);
   static bool   release_memory(char* addr, size_t bytes);
 
+  // Touch memory pages that cover the memory range from start to end (exclusive)
+  // to make the OS back the memory range with actual memory.
+  // Current implementation may not touch the last page if unaligned addresses
+  // are passed.
   static void   pretouch_memory(char* start, char* end);
 
   enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };