On Wed, Mar 30, 2022 at 12:47:50AM +0000, Wei Yang wrote:
> Something like this?
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index eed9916cdce5..5d433b79ba47 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -1005,9 +1005,6 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
> if (!root)
> root = root_mem_cgroup;
>
> - if (prev && !reclaim)
> - pos = prev;
> -
> rcu_read_lock();
>
> if (reclaim) {
> @@ -1033,6 +1030,8 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
> */
> (void)cmpxchg(&iter->position, pos, NULL);
> }
> + } else if (prev) {
> + pos = prev;
> }
>
> if (pos)
Yep!
