On Wed, Jun 03, 2015 at 04:35:35PM +0300, Pavel Emelyanov wrote:
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 4d0a756..45bc78d 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -534,6 +534,20 @@ void sock_update_memcg(struct sock *sk)
> }
> EXPORT_SYMBOL(sock_update_memcg);
>
> +struct mem_cgroup *try_get_mem_cgroup_from_current(void)
> +{
> + struct mem_cgroup *cg;
> +
> + rcu_read_lock();
> + cg = mem_cgroup_from_task(current);
> + if (mem_cgroup_is_root(cg) || !css_tryget(&cg->css))
> + cg = NULL;
> + rcu_read_unlock();
> +
> + return cg;
> +}
> +EXPORT_SYMBOL(try_get_mem_cgroup_from_current);
> +
Why not use try_get_mem_cgroup_from_mm(current->mm) instead?
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