linux-kernel - Re: [PATCH 1/9 v3] cgroup: add cgroup_subsys->post

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Message-ID: <509CC855.4070203@huawei.com>
Date:	Fri, 9 Nov 2012 17:09:41 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<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 v3] cgroup: add cgroup_subsys->post_create()

On 2012/11/9 3:07, Tejun Heo wrote:
> Subject: cgroup: add cgroup_subsys->post_create()
> 
> 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.
> 
> v3: Forgot to add ->post_create() invocation to cgroup_load_subsys().
>     Fixed.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Acked-by: Michal Hocko <mhocko@...e.cz>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Glauber Costa <glommer@...allels.com>

Li Zefan <lizefan@...wei.com

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