tree 5c5d3c93612963b5f6fe5158ac6a3a5ea26e7b7c
parent cbb2864aa48977205c76291ba5a23331393b2578
author Dave Chinner <dchinner@redhat.com> 1372313087 +1000
committer Ben Myers <bpm@sgi.com> 1372357644 -0500

xfs: plug directory buffer readahead

Similar to bulkstat inode chunk readahead, we need to plug directory
data buffer readahead during getdents to ensure that we can merge
adjacent readahead requests and sort out of order requests optimally
before they are dispatched. This improves the readahead efficiency
and reduces the IO load it generates as the IO patterns are
significantly better for both contiguous and fragmented directories.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>