On Wed, Jul 27, 2022 at 08:58:15PM -0400, Waiman Long <longman@xxxxxxxxxx> wrote: > The cgroup_update_dfl_csses() function updates css associations when a > cgroup's subtree_control file is modified. Any changes made to a cgroup's > subtree_control file, however, will only affect its descendants but not > the cgroup itself. I find this correct. > So there is no point in migrating csses associated with that cgroup. > We can skip them instead. Alone it's not such a big win but it componds with the recent Tejun's threadgroup_rwsem elision. > --- > kernel/cgroup/cgroup.c | 9 +++++++++ > 1 file changed, 9 insertions(+) Feel free to have Reviewed-by: Michal Koutný <mkoutny@xxxxxxxx>
