On Mon, Apr 02, 2018 at 02:49:13PM -0700, Tejun Heo wrote: > From b7be022bf811d02605098fa61b7545bc146b78e7 Mon Sep 17 00:00:00 2001 > From: Tejun Heo <[email protected]> > Date: Mon, 2 Apr 2018 14:45:20 -0700 > > cgroup_rstat_updated() ensures that the cgroup's rstat is linked to > the parent. If there's no parent, it never gets linked and the > function ends up grabbing and releasing the cgroup_rstat_lock each > time for no reason which can be expensive. > > This hasn't been a problem till now because nobody was calling the > function for the root cgroup but rstat is gonna be exposed to > controllers and use cases, so let's get ready. Make > cgroup_rstat_updated() an no-op for the root cgroup. > > Signed-off-by: Tejun Heo <[email protected]>
Applied to cgroup/for-4.18. Thanks. -- tejun
