Messages in this thread | | | Date | Fri, 30 Nov 2012 13:09:02 +0900 | From | Kamezawa Hiroyuki <> | Subject | Re: [patch v2 4/6] memcg: simplify mem_cgroup_iter |
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(2012/11/27 3:47), Michal Hocko wrote: > Current implementation of mem_cgroup_iter has to consider both css and > memcg to find out whether no group has been found (css==NULL - aka the > loop is completed) and that no memcg is associated with the found node > (!memcg - aka css_tryget failed because the group is no longer alive). > This leads to awkward tweaks like tests for css && !memcg to skip the > current node. > > It will be much easier if we got rid off css variable altogether and > only rely on memcg. In order to do that the iteration part has to skip > dead nodes. This sounds natural to me and as a nice side effect we will > get a simple invariant that memcg is always alive when non-NULL and all > nodes have been visited otherwise. > > We could get rid of the surrounding while loop but keep it in for now to > make review easier. It will go away in the following patch. > > Signed-off-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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