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

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Message-ID: <20160120195957.GV6033@dastard>
Date:	Thu, 21 Jan 2016 06:59:57 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Benjamin LaHaise <bcrl@...ck.org>, linux-aio@...ck.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 07/13] aio: enabled thread based async fsync

On Tue, Jan 19, 2016 at 07:59:35PM -0800, Linus Torvalds wrote:
> On Fri, Jan 15, 2016 at 12:21 PM, Benjamin LaHaise <bcrl@...ck.org> wrote:
> >>
> >> I'll have to think about this some more.
> >
> > Any further thoughts on this after a few days worth of pondering?
> 
> Sorry about the delay, with the merge window and me being sick for a
> couple of days I didn't get around to this.
> 
> After thinking it over some more, I guess I'm ok with your approach.
> The table-driven patch makes me a bit happier, and I guess not very
> many people end up ever wanting to do async system calls anyway.
> 
> Are there other users outside of Solace? It would be good to get comments..

I know of quite a few storage/db products that use AIO. The most
recent high profile project that have been reporting issues with AIO
on XFS is http://www.scylladb.com/. That project is architected
around non-blocking AIO for scalability reasons...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com