linux-kernel - Re: [PATCH 18/21] blkcg: move blkio_group

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Message-ID: <20120402222504.GA2672@redhat.com>
Date:	Mon, 2 Apr 2012 18:25:04 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tao Ma <tm@....ma>
Cc:	Tejun Heo <tj@...nel.org>, axboe@...nel.dk, ctalbott@...gle.com,
	rni@...gle.com, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, containers@...ts.linux-foundation.org
Subject: Re: [PATCH 18/21] blkcg: move blkio_group_conf->weight to cfq

On Tue, Apr 03, 2012 at 06:20:10AM +0800, Tao Ma wrote:

[..]
> > Yeah, just add config and stat files prefixed with the name of the new
> > blkcg policy.
> OK, I will add a new config file for it.

Only if CFQ could be modified to add one iops mode, flippable through a
sysfs tunable, things will be much simpler. You will not have to add a
new IO scheduler, no new configuration/stat files in blkcg (which is
already crowded now).

I don't think anybody has shown the code that why CFQ can't be modified
to support iops mode.

Thanks
Vivek
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