On Tue, May 02, 2023 at 03:38:44PM +0200, Michal Koutný wrote: > Idea for these modification came up when css_set_lock seemed unneeded in > cgroup_show_path. > It's a delicate change, so the deciding factor was when cgroup_show_path popped > up also in some profiles of frequent mountinfo readers. > The idea is to trade the exclusive css_set_lock for the shared > namespace_sem when rendering cgroup paths. Details are described more in I have no issue with the cgroup specific part of relying on namespace_sem but kernel/cgroup/ has no business of being aware of namespace semaphore in any way. Leave a comment to clarify what you're doing but we're not going to sprinkle namespace_sem references - even if only for the sake of lockdep - into other subsystems.
