(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@xxxxxxxxxx> maybe better than using css->id in some(many) case. Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxx> _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/containers
