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From: "T.J. Mercier" <tjmercier@google.com>
Date: Tue, 28 May 2024 15:45:52 -0700
Message-ID: <CABdmKX0+rRAHVDmv-A549OxBsyaLcTERYeM52_1ZhiL0-gvTyA@mail.gmail.com>
Subject: Re: [PATCH 1/2] cgroup: Fix /proc/cgroups count for v2
To: Tejun Heo <tj@kernel.org>
Cc: =?UTF-8?Q?Michal_Koutn=C3=BD?= <mkoutny@suse.com>, 
	Zefan Li <lizefan.x@bytedance.com>, Johannes Weiner <hannes@cmpxchg.org>, shakeel.butt@linux.dev, 
	cgroups@vger.kernel.org, linux-kernel@vger.kernel.org
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On Tue, May 28, 2024 at 3:42=E2=80=AFPM Tejun Heo <tj@kernel.org> 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 hierarchi=
cal
> > > sums.
>
> Yeah, something like that but hierarchical and built into cgroup2 interfa=
ce.
> 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.

> Thanks.
>
> --
> tejun