Re: aio openat Re: [PATCH 07/13] aio: enabled thread based async fsync

[Linus Torvalds]

On Mon, Mar 14, 2016 at 10:17 AM, Benjamin LaHaise <bcrl@xxxxxxxxx> 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