On Tue, Mar 30, 2021 at 06:15:18PM +0800, Muchun Song wrote: > When mm is NULL, we do not need to hold rcu lock and call css_tryget for > the root memcg. And we also do not need to check !mm in every loop of > while. So bail out early when !mm. > > Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> Good observation. Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
