linux-kernel - Re: [PATCH 3/9] cgroup: implement generic child / descendant walk macros

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Date:	Thu, 08 Nov 2012 12:21:40 +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
Subject: Re: [PATCH 3/9] cgroup: implement generic child / descendant walk
 macros

(2012/11/03 17:38), Tejun Heo wrote:
> Currently, cgroup doesn't provide any generic helper for walking a
> given cgroup's children or descendants.  This patch adds the following
> three macros.
> 
> * cgroup_for_each_child() - walk immediate children of a cgroup.
> 
> * cgroup_for_each_descendant_pre() - visit all descendants of a cgroup
>    in pre-order tree traversal.
> 
> * cgroup_for_each_descendant_post() - visit all descendants of a
>    cgroup in post-order tree traversal.
> 
> All three only require the user to hold RCU read lock during
> traversal.  Verifying that each iterated cgroup is online is the
> responsibility of the user.  When used with proper synchronization,
> cgroup_for_each_descendant_pre() can be used to propagate config
> updates to descendants in reliable way.  See comments for details.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>

maybe better than using css->id in some(many) case.

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



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