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xfs: do not update xa_last_pushed_lsn for locked items

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If an item was locked we should not update xa_last_pushed_lsn and thus skip
it when restarting the AIL scan as we need to be able to lock and write it
out as soon as possible.  Otherwise heavy lock contention might starve AIL
pushing too easily, especially given the larger backoff once we moved
xa_last_pushed_lsn all the way to the target lsn.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Stefan Priebe <s.priebe@profihost.ag>
Tested-by: Stefan Priebe <s.priebe@profihost.ag>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-10-11 15:14:08 +00:00 committed by Alex Elder
parent 65112dccf8
commit bc6e588a89
1 changed files with 0 additions and 1 deletions
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fs/xfs/xfs_trans_ail.c
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@ -440,7 +440,6 @@ xfs_ail_worker(
case XFS_ITEM_LOCKED:
XFS_STATS_INC(xs_push_ail_locked);
ailp->xa_last_pushed_lsn = lsn;
stuck++;
break;