linux-kernel - Re: [PATCH 1/9 v2] cgroup: add cgroup_subsys->post

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Date:	Thu, 08 Nov 2012 11:59:41 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	lizefan@...wei.com, mhocko@...e.cz, rjw@...k.pl,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	fweisbec@...il.com, Glauber Costa <glommer@...allels.com>
Subject: Re: [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@...nel.org>
> Acked-by: Michal Hocko <mhocko@...e.cz>
> Cc: Glauber Costa <glommer@...allels.com>


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


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