Comment 1 for bug 925441

Alexey Kopytov (akopytov) wrote :

The problem was that posix_fadvise(POSIX_FADV_DONTNEED) was used
incorrectly, because the call just releases already cached pages from
the pagecache, thus making a single-shot call before file access
useless.

Fixed by making sure the call is invoked after each read/write to
make the feature work as advertised.