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xfs: log IO completion workqueue is a high priority queue

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The workqueue implementation in 2.6.36-rcX has changed, resulting
in the workqueues no longer having dedicated threads for work
processing. This has caused severe livelocks under heavy parallel
create workloads because the log IO completions have been getting
held up behind metadata IO completions.  Hence log commits would
stall, memory allocation would stall because pages could not be
cleaned, and lock contention on the AIL during inode IO completion
processing was being seen to slow everything down even further.

By making the log Io completion workqueue a high priority workqueue,
they are queued ahead of all data/metadata IO completions and
processed before the data/metadata completions. Hence the log never
gets stalled, and operations needed to clean memory can continue as
quickly as possible. This avoids the livelock conditions and allos
the system to keep running under heavy load as per normal.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-09-08 09:00:22 +00:00 committed by Alex Elder
parent a122eb2fdf
commit 51749e47e1
1 changed files with 2 additions and 1 deletions
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3
fs/xfs/linux-2.6/xfs_buf.c
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@ -1932,7 +1932,8 @@ xfs_buf_init(void)
if (!xfs_buf_zone)
goto out;
xfslogd_workqueue = create_workqueue("xfslogd");
xfslogd_workqueue = alloc_workqueue("xfslogd",
WQ_RESCUER | WQ_HIGHPRI, 1);
if (!xfslogd_workqueue)
goto out_free_buf_zone;