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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>
This commit is contained in:
Dave Chinner 2013-06-27 16:04:47 +10:00 committed by Ben Myers
parent cbb2864aa4
commit 34eefc06a0
1 changed files with 3 additions and 0 deletions
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3
fs/xfs/xfs_dir2_leaf.c
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@ -1108,6 +1108,7 @@ xfs_dir2_leaf_readbuf(
struct xfs_mount *mp = dp->i_mount;
struct xfs_buf *bp = *bpp;
struct xfs_bmbt_irec *map = mip->map;
struct blk_plug plug;
int error = 0;
int length;
int i;
@ -1236,6 +1237,7 @@ xfs_dir2_leaf_readbuf(
/*
* Do we need more readahead?
*/
blk_start_plug(&plug);
for (mip->ra_index = mip->ra_offset = i = 0;
mip->ra_want > mip->ra_current && i < mip->map_blocks;
i += mp->m_dirblkfsbs) {
@ -1287,6 +1289,7 @@ xfs_dir2_leaf_readbuf(
}
}
}
blk_finish_plug(&plug);
out:
*bpp = bp;