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[PATCH 0/2] Improve writeout pattern from xfs_flush_pages()

To: hch@xxxxxxxxxxxxx
Subject: [PATCH 0/2] Improve writeout pattern from xfs_flush_pages()
From: Jan Kara <jack@xxxxxxx>
Date: Wed, 3 Aug 2011 22:49:03 +0200
Cc: xfs@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
  Hi,

  at one of customer's machines, I've spotted an issue that sync(1) called
after writing a single huge file has been achieving rather low throughput. After
debugging this with blktrace, I've found that the culprit was in flusher thread
racing with page writeout happening from XFS sync code. The patches below helped
that case. Although they are not a complete solution, I belive they are useful
anyway so please consider merging them...

                                                                        Honza

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