This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "XFS development tree". The branch, for-linus has been updated 51749e4 xfs: log IO completion workqueue is a high priority queue from a122eb2fdfd78b58c6dd992d6f4b1aaef667eef9 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit 51749e47e191db8e588ad5cebea731caf7b705d7 Author: Dave Chinner <dchinner@xxxxxxxxxx> Date: Wed Sep 8 09:00:22 2010 +0000 xfs: log IO completion workqueue is a high priority queue 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@xxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Alex Elder <aelder@xxxxxxx> ----------------------------------------------------------------------- Summary of changes: fs/xfs/linux-2.6/xfs_buf.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) hooks/post-receive -- XFS development tree _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs