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From: Dave Chinner <david@fromorbit.com>
To: xfs@oss.sgi.com
Subject: [PATCH 03/17] xfs: plug directory buffer readahead
Date: Fri,  7 Jun 2013 15:45:15 +1000	[thread overview]
Message-ID: <1370583929-14276-4-git-send-email-david@fromorbit.com> (raw)
In-Reply-To: <1370583929-14276-1-git-send-email-david@fromorbit.com>

From: Dave Chinner <dchinner@redhat.com>

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>
---
 fs/xfs/xfs_dir2_leaf.c |    3 +++
 1 file changed, 3 insertions(+)

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;
-- 
1.7.10.4

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  parent reply	other threads:[~2013-06-07  5:46 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-07  5:45 [PATCH 00/17] xfs: current patch queue for 3.11 Dave Chinner
2013-06-07  5:45 ` [PATCH 01/17] xfs: update mount options documentation Dave Chinner
2013-06-07  5:45 ` [PATCH 02/17] xfs: add pluging for bulkstat readahead Dave Chinner
2013-06-07  5:45 ` Dave Chinner [this message]
2013-06-07  5:45 ` [PATCH 04/17] xfs: don't use speculative prealloc for small files Dave Chinner
2013-06-07  5:45 ` [PATCH 05/17] xfs: don't do IO when creating an new inode Dave Chinner
2013-06-07  5:45 ` [PATCH 06/17] xfs: xfs_ifree doesn't need to modify the inode buffer Dave Chinner
2013-06-07  5:45 ` [PATCH 07/17] xfs: Introduce ordered log vector support Dave Chinner
2013-06-07  5:45 ` [PATCH 08/17] xfs: Introduce an ordered buffer item Dave Chinner
2013-06-07  5:45 ` [PATCH 09/17] xfs: Inode create log items Dave Chinner
2013-06-07  5:45 ` [PATCH 10/17] xfs: Inode create transaction reservations Dave Chinner
2013-06-07  5:45 ` [PATCH 11/17] xfs: Inode create item recovery Dave Chinner
2013-06-07  5:45 ` [PATCH 12/17] xfs: Use inode create transaction Dave Chinner
2013-06-07  5:45 ` [PATCH 13/17] xfs: remove local fork format handling from xfs_bmapi_write() Dave Chinner
2013-06-07  5:45 ` [PATCH 14/17] xfs: move getdents code into it's own file Dave Chinner
2013-06-07  5:45 ` [PATCH 15/17] xfs: reshuffle dir2 definitions around for userspace Dave Chinner
2013-06-07  5:45 ` [PATCH 16/17] xfs: split out attribute listing code into separate file Dave Chinner
2013-06-07  5:45 ` [PATCH 17/17] xfs: split out attribute fork truncation " Dave Chinner

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