Re: [PATCH 7/9] block: implement bio_associate_current()

[Tejun Heo]

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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