xfs: Sort delayed write buffers before dispatch

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Currently when the xfsbufd writes delayed write buffers, it pushes
them to disk in the order they come off the delayed write list. If
there are lots of buffers ѕpread widely over the disk, this results
in overwhelming the elevator sort queues in the block layer and we
end up losing the posibility of merging adjacent buffers to minimise
the number of IOs.

Use the new generic list_sort function to sort the delwri dispatch
queue before issue to ensure that the buffers are pushed in the most
friendly order possible to the lower layers.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

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This commit is contained in:

Dave Chinner 2010-01-26 15:13:25 +11:00

parent d808f617ad

commit 089716aa14

1 changed files with 60 additions and 27 deletions

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fs/xfs/linux-2.6/xfs_buf.c

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