On Tue, Apr 22, 2014 at 5:47 PM, Michal Hocko <mhocko@xxxxxxx> wrote: > What about > 3. last_visited == last_node in the tree > > __mem_cgroup_iter_next returns NULL and the iterator would return > without visiting anything. Hi, Michal, yep, if 3 last_visited == last_node, then this means we have done a round-trip, thus __mem_cgroup_iter_next returns NULL, in turn mem_cgroup_iter() return NULL. This is what comments above mem_cgroup_iter() says: >Returns references to children of the hierarchy below @root, or >* @root itself, or %NULL after a full round-trip. Actually, this condition could be reduced to conditon 2.1 Thanks, Jianyu Zhan -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
