On Thu, Oct 01, 2020 at 01:27:13PM -0400, Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > The activation code is the only path where page migration is not > excluded. Because unlike with page state statistics, we don't really > mind a race when counting an activation event. Thanks for the explanation. I see why the accessor trio is justified. > I do think there is a bug, though: mem_cgroup_move_account() should > use WRITE_ONCE() on page->mem_cgroup. If this were a bug, wouldn't be the proper approach rcu_assign_pointer()/rcu_dereference() pair? Michal
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