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    SubjectRe: [PATCH 11/12] vmscan: Write out dirty pages in batch
    On Mon, Jun 14, 2010 at 04:21:43PM -0700, Andrew Morton wrote:
    > Yup.
    > But then, this all really should be done at the block layer so other
    > io-submitting-paths can benefit from it.
    > IOW, maybe "the sort queue is the submission queue" wasn't a good idea.

    Even if has not effect on the actual I/O patters it has a massive
    benefit for the filesystem. When probing delalloc/unwritten space at
    least XFS does try to convert a larger extent forward from the index,
    but doesn't bother to go backwards. By providing the trivial sort here
    we make life a lot easier for the filesystem.

    In addition to that we do get better I/O patters especially with short
    queues as smart writepage implementatons will also submit the next few
    pages, which is essentially free given how the storage works.
    This means we already have a page cleaned before we might even submit it
    without sorting.

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