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

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Message-ID: <20120217224103.GN29414@google.com>
Date:	Fri, 17 Feb 2012 14:41:03 -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 05:34:20PM -0500, Vivek Goyal wrote:
> Nope. We make note of task migration and drop cic->cfqq association
> and establish a new association where new cfqq is part of new cgroup.
> (ioc_cgroup_changed()).

Yeah, that's the CHANGED bit thing.  I probably got confused with
blk-throttle losing blkcg while testing.  Anyways, it would be great
if we can either remove that altogether.  e.g. compare the cached
blkg->blkcg and see if it has changed from cfq.  Or add a callback and
do the shootdown synchronously at least.

Thanks.

-- 
tejun
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