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    SubjectRe: [RFC][PATCH] Make io_submit non-blocking
    On Wed, Jul 25, 2012 at 08:31:10AM +1000, Dave Chinner wrote:
    > FWIW, if you are going to change generic code, you need to present
    > results for other filesystems as well (xfs, btrfs are typical), as
    > they may not have the same problems as ext4 or react the same way to
    > your change. The result might simply be "it is 20% slower"....

    And most importantly block devices, as they are one of the biggest
    use cases of AIO. With an almost no-op get_blocks callback I can't
    see how this change would provide any gain there.



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