linux-kernel - Re: [PATCH 12/12] blkcg: kill the mind-bending blkg->dev

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Date:	Thu, 19 Jan 2012 08:30:56 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	axboe@...nel.dk, ctalbott@...gle.com, rni@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/12] blkcg: kill the mind-bending blkg->dev

Hello,

On Thu, Jan 19, 2012 at 10:49:19AM -0500, Vivek Goyal wrote:
> > Let stat and conf read functions get device name from
> > blkg->q->backing_dev_info.dev and pass it down to printing functions
> > and remove blkg->dev.
> 
> I think one of the reasons for not using blkg->q->backing_dev_info.dev was
> that there were still drivers where multiple gendisks were sharing the
> request queue.

Hmmm... is that relevant?  The configurations / stats are per
cgroup-request_queue pair.  How does multiple genhd's sharing a queue
make any difference?  Also, the fill_dev_details functions were using
the same q->backing_dev_info to fill it in, so it's not like it was
using anything different.

Thanks.

-- 
tejun
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