linux-kernel - Re: [PATCH RFC - TAKE TWO - 02/12] block, bfq: add full hierarchical scheduling and cgroups support

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Message-ID: <20140530153718.GB24871@htj.dyndns.org>
Date:	Fri, 30 May 2014 11:37:18 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Paolo Valente <paolo.valente@...more.it>
Cc:	Jens Axboe <axboe@...nel.dk>, 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 - 02/12] block, bfq: add full hierarchical
 scheduling and cgroups support

On Thu, May 29, 2014 at 11:05:33AM +0200, Paolo Valente wrote:
> diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
> index 768fe44..cdd2528 100644
> --- a/include/linux/cgroup_subsys.h
> +++ b/include/linux/cgroup_subsys.h
> @@ -39,6 +39,10 @@ SUBSYS(net_cls)
>  SUBSYS(blkio)
>  #endif
>  
> +#if IS_ENABLED(CONFIG_CGROUP_BFQIO)
> +SUBSYS(bfqio)
> +#endif

So, ummm, I don't think this is a good idea.  Why aren't you plugging
into the blkcg infrastructure as cfq does?  Why does it need to be a
separate controller?

Thanks.

-- 
tejun
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