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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