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Fri, 11 Jul 2025 06:10:47 -0700 (PDT) Received: from blackdock.suse.cz ([193.86.92.181]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-454dd47528fsm46969975e9.13.2025.07.11.06.10.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Jul 2025 06:10:46 -0700 (PDT) Date: Fri, 11 Jul 2025 15:10:44 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Ben Hutchings Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Tejun Heo , Zefan Li , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , Chen Ridong , 1108294@bugs.debian.org Subject: Re: [PATCH 4/4] cgroup: Do not report unavailable v1 controllers in /proc/cgroups Message-ID: References: <20240909163223.3693529-1-mkoutny@suse.com> <20240909163223.3693529-5-mkoutny@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: B66B3A0013 X-Stat-Signature: ej4aod3qxown1ycfx1j4iwh5x8w34q17 X-Rspam-User: X-HE-Tag: 1752239448-548831 X-HE-Meta: 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 7dtL0SOA qh1ltcyRRYhIi6Ek= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello Ben. On Wed, Jul 09, 2025 at 08:22:09PM +0200, Ben Hutchings 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? I appreciate your report, Michal