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    SubjectRe: [PATCH 1/9 v2] cgroup: add cgroup_subsys->post_create()
    (2012/11/08 2:15), Tejun Heo wrote:
    > Currently, there's no way for a controller to find out whether a new
    > cgroup finished all ->create() allocatinos successfully and is
    > considered "live" by cgroup.
    >
    > This becomes a problem later when we add generic descendants walking
    > to cgroup which can be used by controllers as controllers don't have a
    > synchronization point where it can synchronize against new cgroups
    > appearing in such walks.
    >
    > This patch adds ->post_create(). It's called after all ->create()
    > succeeded and the cgroup is linked into the generic cgroup hierarchy.
    > This plays the counterpart of ->pre_destroy().
    >
    > When used in combination with the to-be-added generic descendant
    > iterators, ->post_create() can be used to implement reliable state
    > inheritance. It will be explained with the descendant iterators.
    >
    > v2: Added a paragraph about its future use w/ descendant iterators per
    > Michal.
    >
    > Signed-off-by: Tejun Heo <tj@kernel.org>
    > Acked-by: Michal Hocko <mhocko@suse.cz>
    > Cc: Glauber Costa <glommer@parallels.com>


    Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>




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