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4ef420b345
Replace the global cgroup_file_kn_lock with a per-cgroup_file spinlock to eliminate cross-cgroup contention as it is not really protecting data shared between different cgroups. The lock is initialized in cgroup_add_file() alongside timer_setup(). No lock acquisition is needed during initialization since the cgroup directory is being populated under cgroup_mutex and no concurrent accessors exist at that point. Reported-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev> Signed-off-by: Tejun Heo <tj@kernel.org>