| Date | Thu, 08 Nov 2012 12:21:40 +0900 | From | Kamezawa Hiroyuki <> | Subject | Re: [PATCH 3/9] cgroup: implement generic child / descendant walk macros |
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(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@kernel.org>
maybe better than using css->id in some(many) case.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujisu.com>
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