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authorDave Chinner <david@fromorbit.com>2010-02-02 10:13:42 +1100
committerDave Chinner <david@fromorbit.com>2010-02-02 10:13:42 +1100
commitd808f617ad00a413585b806de340feda5ad9a2da (patch)
treeed03d4d019a9d8b566ffd454e112e9fbce70bad8 /fs/xfs/xfs_trans_ail.c
parentc854363e80b49dd04a4de18ebc379eb8c8806674 (diff)
xfs: Don't issue buffer IO direct from AIL push V2
All buffers logged into the AIL are marked as delayed write. When the AIL needs to push the buffer out, it issues an async write of the buffer. This means that IO patterns are dependent on the order of buffers in the AIL. Instead of flushing the buffer, promote the buffer in the delayed write list so that the next time the xfsbufd is run the buffer will be flushed by the xfsbufd. Return the state to the xfsaild that the buffer was promoted so that the xfsaild knows that it needs to cause the xfsbufd to run to flush the buffers that were promoted. Using the xfsbufd for issuing the IO allows us to dispatch all buffer IO from the one queue. This means that we can make much more enlightened decisions on what order to flush buffers to disk as we don't have multiple places issuing IO. Optimisations to xfsbufd will be in a future patch. Version 2 - kill XFS_ITEM_FLUSHING as it is now unused. Signed-off-by: Dave Chinner <david@fromorbit.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_trans_ail.c')
-rw-r--r--fs/xfs/xfs_trans_ail.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index d7b1af8a832d..e799824f7245 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -253,6 +253,7 @@ xfsaild_push(
int flush_log, count, stuck;
xfs_mount_t *mp = ailp->xa_mount;
struct xfs_ail_cursor *cur = &ailp->xa_cursors;
+ int push_xfsbufd = 0;
spin_lock(&ailp->xa_lock);
xfs_trans_ail_cursor_init(ailp, cur);
@@ -308,6 +309,7 @@ xfsaild_push(
XFS_STATS_INC(xs_push_ail_pushbuf);
IOP_PUSHBUF(lip);
last_pushed_lsn = lsn;
+ push_xfsbufd = 1;
break;
case XFS_ITEM_PINNED:
@@ -322,12 +324,6 @@ xfsaild_push(
stuck++;
break;
- case XFS_ITEM_FLUSHING:
- XFS_STATS_INC(xs_push_ail_flushing);
- last_pushed_lsn = lsn;
- stuck++;
- break;
-
default:
ASSERT(0);
break;
@@ -374,6 +370,11 @@ xfsaild_push(
xfs_log_force(mp, 0);
}
+ if (push_xfsbufd) {
+ /* we've got delayed write buffers to flush */
+ wake_up_process(mp->m_ddev_targp->bt_task);
+ }
+
if (!count) {
/* We're past our target or empty, so idle */
last_pushed_lsn = 0;