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[XFS updates] XFS development tree branch, master, updated. v2.6.34-1925

To: xfs@xxxxxxxxxxx
Subject: [XFS updates] XFS development tree branch, master, updated. v2.6.34-19258-g0e25146
From: xfs@xxxxxxxxxxx
Date: Fri, 10 Sep 2010 12:56:56 -0500
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The branch, master has been updated
  0e25146 xfs: log IO completion workqueue is a high priority queue
      from  2b721efdc2b638a7ca23345d99a348a428fbf8c2 (commit)

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- Log -----------------------------------------------------------------
commit 0e251465b06b75dfed16b9373c25cce85eeda484
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(-)


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