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authorDave Chinner <dchinner@redhat.com>2013-06-27 16:04:47 +1000
committerBen Myers <bpm@sgi.com>2013-06-27 13:27:24 -0500
commit34eefc06a06f496b92c3267a0601129a932c7174 (patch)
tree5c5d3c93612963b5f6fe5158ac6a3a5ea26e7b7c /fs/xfs
parentcbb2864aa48977205c76291ba5a23331393b2578 (diff)
downloadop-kernel-dev-34eefc06a06f496b92c3267a0601129a932c7174.zip
op-kernel-dev-34eefc06a06f496b92c3267a0601129a932c7174.tar.gz
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>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_dir2_leaf.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir2_leaf.c b/fs/xfs/xfs_dir2_leaf.c
index da71a18..bb22aac 100644
--- a/fs/xfs/xfs_dir2_leaf.c
+++ b/fs/xfs/xfs_dir2_leaf.c
@@ -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;
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