Re: [PATCH v4 3/6] memcg: fast hierarchy-aware child test.

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(2013/01/22 22:47), Glauber Costa wrote:
> Currently, we use cgroups' provided list of children to verify if it is
> safe to proceed with any value change that is dependent on the cgroup
> being empty.
> 
> This is less than ideal, because it enforces a dependency over cgroup
> core that we would be better off without. The solution proposed here is
> to iterate over the child cgroups and if any is found that is already
> online, we bounce and return: we don't really care how many children we
> have, only if we have any.
> 
> This is also made to be hierarchy aware. IOW, cgroups with  hierarchy
> disabled, while they still exist, will be considered for the purpose of
> this interface as having no children.
> 
> Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
> Acked-by: Michal Hocko <mhocko@xxxxxxx>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>


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