/* don't pollute the buffer cache with data read from the file. We do this while reading to
keep damage minimal */
if (0 != posix_fadvise(fileno(in_file), rrd_head_size, ftell(in_file), POSIX_FADV_DONTNEED)) {
/* don't pollute the buffer cache with data read from the file. We do this while reading to
keep damage minimal */
if (0 != posix_fadvise(fileno(in_file), rrd_head_size, ftell(in_file), POSIX_FADV_DONTNEED)) {
/* and just to be sure we drop everything except the header at the end */
if (0 != posix_fadvise(fileno(in_file), rrd_head_size, 0, POSIX_FADV_DONTNEED)) {
/* and just to be sure we drop everything except the header at the end */
if (0 != posix_fadvise(fileno(in_file), rrd_head_size, 0, POSIX_FADV_DONTNEED)) {