Re: [PATCH v3 bpf-next 02/11] cgroup: Make operations on the cgroup root_list RCU safe

Tejun Heo
2023-11-09T21:19:46Z

On Sun, Oct 29, 2023 at 06:14:29AM +0000, Yafang Shao wrote:
> At present, when we perform operations on the cgroup root_list, we must
> hold the cgroup_mutex, which is a relatively heavyweight lock. In reality,
> we can make operations on this list RCU-safe, eliminating the need to hold
> the cgroup_mutex during traversal. Modifications to the list only occur in
> the cgroup root setup and destroy paths, which should be infrequent in a
> production environment. In contrast, traversal may occur frequently.
> Therefore, making it RCU-safe would be beneficial.
>
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

--
tejun