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SubjectRe: [PATCH 15/23] cgroup: make hierarchy iterators deal with cgroup_subsys_state instead of cgroup
On Thu, Aug 01, 2013 at 05:49:53PM -0400, Tejun Heo wrote:
> cgroup is currently in the process of transitioning to using css
> (cgroup_subsys_state) as the primary handle instead of cgroup in
> subsystem API. For hierarchy iterators, this is beneficial because
>
> * In most cases, css is the only thing subsystems care about anyway.
>
> * On the planned unified hierarchy, iterations for different
> subsystems will need to skip over different subtrees of the
> hierarchy depending on which subsystems are enabled on each cgroup.
> Passing around css makes it unnecessary to explicitly specify the
> subsystem in question as css is intersection between cgroup and
> subsystem
>
> * For the planned unified hierarchy, css's would need to be created
> and destroyed dynamically independent from cgroup hierarchy. Having
> cgroup core manage css iteration makes enforcing deref rules a lot
> easier.
>
> Most subsystem conversions are straight-forward. Noteworthy changes
> are
>
> * blkio: cgroup_to_blkcg() is no longer used. Removed.
>
> * freezer: cgroup_freezer() is no longer used. Removed.
>
> * devices: cgroup_to_devcgroup() is no longer used. Removed.
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Cc: Li Zefan <lizefan@huawei.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Michal Hocko <mhocko@suse.cz>
> Cc: Balbir Singh <bsingharora@gmail.com>
> Cc: Aristeu Rozanski <aris@redhat.com>
> Cc: Matt Helsley <matthltc@us.ibm.com>
> Cc: Vivek Goyal <vgoyal@redhat.com>
> Cc: Jens Axboe <axboe@kernel.dk>
> ---
> block/blk-cgroup.c | 8 +--
> block/blk-cgroup.h | 25 ++++-----
> block/blk-throttle.c | 8 +--

Block bits look good to me.

Acked-by: Vivek Goyal <vgoyal@redhat.com>

Vivek


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