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

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Message-ID: <CA+55aFx7JJdYNWRSs6Nbm_xyQjgUVoBQh=RuNDeavKS1Jr+-ow@mail.gmail.com>
Date:	Sat, 19 Mar 2016 18:20:24 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	Dave Chinner <david@...morbit.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-aio@...ck.org, linux-mm <linux-mm@...ck.org>
Subject: Re: aio openat Re: [PATCH 07/13] aio: enabled thread based async fsync

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