linux-kernel - Re: [PATCH RFC - TAKE TWO - 00/12] New version of the BFQ I/O Scheduler

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Message-ID: <20140604145829.GF5004@htj.dyndns.org>
Date:	Wed, 4 Jun 2014 10:58:29 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Paolo Valente <paolo.valente@...more.it>,
	Li Zefan <lizefan@...wei.com>,
	Fabio Checconi <fchecconi@...il.com>,
	Arianna Avanzini <avanzini.arianna@...il.com>,
	Paolo Valente <posta_paolo@...oo.it>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org
Subject: Re: [PATCH RFC - TAKE TWO - 00/12] New version of the BFQ I/O
 Scheduler

On Wed, Jun 04, 2014 at 07:53:30AM -0700, Christoph Hellwig wrote:
> On Wed, Jun 04, 2014 at 10:50:53AM -0400, Tejun Heo wrote:
> > Hmmm... the biggest thing is ioscheds.  They heavily rely on being
> > strongly synchronized and are pretty important for rotating rusts.
> > Maybe they can be made to work with blk-mq by forcing single queue or
> > something but do we wnat that?
> 
> Jens is planning to add an (optional) I/O scheduler to blk-mq, and
> that is indeed required for proper disk support.  I don't think there
> even is a need to limit it to a single queue technically, although
> devices that support multiple queues are unlikely to need I/O
> scheduling.

I think what Jens is planning is something really minimal.  Things
like [cb]fq heavily depend on the old block infrastructure.  I don't
know.  Maybe they can be merged in time but I'm not quite sure we'd
have enough pressure to actually do that.  Host-granular switching
should be good enough, I guess.

Thanks.

-- 
tejun
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