src/share/vm/runtime/os.cpp

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

*** 1588,1598 ****
    return res;
  }
  
  void os::pretouch_memory(char* start, char* end) {
    for (volatile char *p = start; p < end; p += os::vm_page_size()) {
!     char t = *p; *p = t;
    }
  }
  
  char* os::map_memory(int fd, const char* file_name, size_t file_offset,
                             char *addr, size_t bytes, bool read_only,
--- 1588,1598 ----
    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,