On Mon, Mar 14, 2016 at 10:17 AM, Benjamin LaHaise [off-list ref] wrote:

I had some time last week to make an aio openat do what it can in
submit context.  The results are an improvement: when openat is handled
in submit context it completes in about half the time it takes compared
to the round trip via the work queue, and it's not terribly much code
either.

This looks good to me, and I do suspect that any of these aio paths
should strive to have a synchronous vs threaded model. I think that
makes the whole thing much more interesting from a performance
standpoint.

I still think the aio interface is really nasty,  but this together
with the table-based approach you posted earlier does make me a _lot_
happier about the implementation.It just looks way less hacky, and now
it ends up exposing a rather more clever implementation too.

             Linus

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