linux-kernel - Re: [PATCH 4/4] cgroup: Do not report unavailable v1 controllers in /proc/cgroups

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Message-ID: <534accb98e487e4891cb58e846bd556f5f40192b.camel@decadent.org.uk>
Date: Sat, 12 Jul 2025 11:28:13 +0200
From: Ben Hutchings <ben@...adent.org.uk>
To: Michal Koutný <mkoutny@...e.com>
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org,  Tejun Heo <tj@...nel.org>, Zefan Li
 <lizefan.x@...edance.com>, Johannes Weiner <hannes@...xchg.org>,  Michal
 Hocko <mhocko@...nel.org>, Roman Gushchin <roman.gushchin@...ux.dev>,
 Shakeel Butt	 <shakeel.butt@...ux.dev>, Muchun Song
 <muchun.song@...ux.dev>, Andrew Morton	 <akpm@...ux-foundation.org>, Chen
 Ridong <chenridong@...wei.com>, 	1108294@...s.debian.org
Subject: Re: [PATCH 4/4] cgroup: Do not report unavailable v1 controllers in
 /proc/cgroups

On Fri, 2025-07-11 at 15:10 +0200, Michal Koutný wrote:
> Hello Ben.
> 
> On Wed, Jul 09, 2025 at 08:22:09PM +0200, Ben Hutchings <ben@...adent.org.uk> wrote:
> > Would you consider reverting this change for the sake of compatibility?
> 
> As you write, it's not fatally broken and it may be "just" an issue of
> container images that got no fresh rebuild. (And I think it should be
> generally discouraged running containers with stale deps in them.)
> 
> The original patch would mainly serve legacy userspace (host) setups on
> top of contemporary kernel (besides API purity reasons). Admittedly,
> these should be rare and eventually extinct in contrast with your
> example where it's a containerized userspace (which typically could do
> no cgroup setup) that may still have some user demand.
> 
> So, I'd be more confident with the revert if such an adjustment was
> carried downstream by some distro and proven its viability first. Do you
> know of any in the wild?

The revert has just gone into Debian unstable, targetting the upcoming
stable release.  So at this point I can't confidently state that it
won't also cause regressions.

Ben.

> 
> I appreciate your report,
> Michal

-- 
Ben Hutchings
Experience is directly proportional to the value of equipment destroyed
                                                    - Carolyn Scheppner

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