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SubjectRe: [PATCH 7/9] block: implement bio_associate_current()
On Fri, Feb 17, 2012 at 02:14:06PM -0800, Tejun Heo wrote:

> If the associated blkcg is used consistently through block layer, it
> might be better but cfq doesn't even do that. It has its own icq ->
> blkcg mapping, which it initializes on first cfqq association. It
> even ignores tasks migrating to a different cgroup and keeps using
> whatever cgroup the task first issued IOs on. :(

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.

In the past people have raised the issue of retaining the notion of
iopriority while dm targets are operating in between. This patchset
will help for that case.


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