> +bool mem_cgroup_kswapd_can_sleep(void)
> +{
> + return list_empty(&memcg_kswapd_control.list);
> +}
and,
> @@ -2583,40 +2585,46 @@ static void kswapd_try_to_sleep(struct kswapd *kswapd_p, int order,
> } else {
> + /* For now, we just check the remaining works.*/
> + if (mem_cgroup_kswapd_can_sleep())
> + schedule();
has bad assumption. If freeable memory is very little and kswapds are
contended, memcg-kswap also have to give up and go into sleep as global
kswapd.
Otherwise, We are going to see kswapd cpu 100% consumption issue again.
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