On Tue, May 28, 2024 at 3:45 PM T.J. Mercier <tjmercier@xxxxxxxxxx> wrote: > > On Tue, May 28, 2024 at 3:42 PM Tejun Heo <tj@xxxxxxxxxx> wrote: > > > > On Tue, May 28, 2024 at 03:38:01PM -0700, T.J. Mercier wrote: > > > > > I think it would make sense to introduce something in a similar > > > > > fashion. Can't think of a good name off the top of my head but add a > > > > > cgroup. file which lists the controllers in the subtree along with the > > > > > number of css's. > > > > > > > > BTW, there is the 'debug' subsys that has (almost) exactly that: > > > > 'debug.csses' -- it's in v1 fashion though so it won't show hierarchical > > > > sums. > > > > Yeah, something like that but hierarchical and built into cgroup2 interface. > > Would that work for your use case? > > > I think so, I'm checking this out now. debug as v1-only and non-stable > interface files doesn't work, but the same sort of thing with a stable > interface on v2 seems like it would. > Ok debug.cgroup_subsys_states reports css->css->online_cnt, but I'd also want to include the number that are dying. Either as a separate count or combined with the online_cnt like in /proc/cgroups.
