linux-kernel - Re: [PATCH 7/9] block: implement bio_associate

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Message-ID: <20120217230643.GQ29414@google.com>
Date:	Fri, 17 Feb 2012 15:06:43 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Kent Overstreet <koverstreet@...gle.com>, axboe@...nel.dk,
	ctalbott@...gle.com, rni@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] block: implement bio_associate_current()

On Fri, Feb 17, 2012 at 05:56:15PM -0500, Vivek Goyal wrote:
> BTW, blk-throttle mangling the context, is a real problem you are facing
> or it is just one of things which is nice to fix.

Yeah, it is a real problem which makes blk-throttle useless if cfq
propio is in use.

> If a cgroup is being throttled do people really care about the
> iopriority of original task that much. (Given the fact that
> iopriority helps only so much and kills performance on fast
> storage).

Yeap, apparently, people wanna apply hard limits on top of propio.
Besides, it's just bad to mangle cgroup *randomly* as the current code
does.

Thanks.

-- 
tejun
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