Re: [PATCH 15/23] cgroup: make hierarchy iterators deal withcgroup_subsys_state instead of cgroup

From: Aristeu Rozanski
Date: Mon Aug 05 2013 - 14:11:23 EST

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.

Acked-by: Aristeu Rozanski <aris@xxxxxxxxxx>


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