diff -r 41a855ff6305 -r 340ca8812af9 src/share/vm/runtime/os.cpp
--- a/src/share/vm/runtime/os.cpp	Mon Sep 15 10:57:22 2014 +0200
+++ b/src/share/vm/runtime/os.cpp	Thu Dec 18 09:37:02 2014 +0100
@@ -1513,6 +1513,11 @@
   return res;
 }
 
+void os::pretouch_memory(char* start, char* end) {
+  for (volatile char *p = start; p < end; p += os::vm_page_size()) {
+    *p = 0;
+  }
+}
 
 char* os::map_memory(int fd, const char* file_name, size_t file_offset,
                            char *addr, size_t bytes, bool read_only,