linux-kernel - Re: [PATCH RFC] blkcg: prepare blkcg knobs for default hierarchy

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Message-ID: <20140523173957.GA31780@htj.dyndns.org>
Date:	Fri, 23 May 2014 13:39:57 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	Li Zefan <lizefan@...wei.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH RFC] blkcg: prepare blkcg knobs for default hierarchy

Hello, Vivek.

On Wed, Apr 23, 2014 at 03:21:09PM -0400, Vivek Goyal wrote:
> What about sync/async differentiation? Throttling layer seems to flag a request sync
> only if bio->bi_rw flag has REQ_SYNC set. While CFQ seems to consider
> request sync if bio is either read or bio->bi_rw has REQ_SYNC flag set.

Working on this again, AFAICS, both treat REQ_SYNC the same way as far
as stats are concerned.  If SYNC is set, it's sync; otherwise, it's
accounted as async whether read or write.

Thanks.

-- 
tejun
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