src/share/vm/runtime/os.cpp

rev 7555 : imported patch 8067469-g1-ignores-alwayspretouch
rev 7556 : [mq]: david-erik-review

*** 1586,1595 ****
--- 1586,1600 ----
      res = pd_release_memory(addr, bytes);
    }
    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,
                             bool allow_exec) {
    char* result = pd_map_memory(fd, file_name, file_offset, addr, bytes, read_only, allow_exec);