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 +Zc4ukbX 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 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: On 6/17/2025 5:30 PM, Michal Koutný wrote: > On Tue, Jun 03, 2025 at 10:46:06PM +0800, "Chen, Yu C" wrote: >> My understanding is that the "misplaced" container is not strictly tied >> to set_mempolicy or cpuset configuration, but is mainly caused by the >> scheduler's generic load balancer. > > You are convincing me with this that, cpu.stat fits the concept better. > Doesn't that sound like that to you? > >> Regarding the threaded subtrees mode, I was previously unfamiliar with >> it and have been trying to understand it better. > > No problem. > >> If I understand correctly, if threads within a single process are >> placed in different cgroups via cpuset, we might need to scan >> /proc//sched to collect NUMA task migration/swap statistics. > > The premise of your series was that you didn't want to do that :-) > >> I agree with your prior point that NUMA balancing task activity is not >> directly >> associated with either the Memory controller or the CPU controller. Although >> showing this data in cpu.stat might seem more appropriate, we expose it in >> memory.stat due to the following trade-offs(or as an exception for >> NUMA balancing): >> >> 1.It aligns with existing NUMA-related metrics already present in >> memory.stat. > > That one I'd buy into. OTOH, I'd hope this could be overcome with > documentation. > >> 2.It simplifies code implementation. > > I'd say that only applies when accepting memory.stat as the better > place. I think the appropriately matching API should be picked first and > implementation is only secondary to that. Thanks for this guidance. > From your reasoning above, I think that the concept is closer to be in > cpu.stat ¯\_(ツ)_/¯ > OK. Since this change has already been addressed in upstream kernel, I can update the numa_task_migrated/numa_task_swapped fields in Documentation/admin-guide/cgroup-v2.rst to mention that, these activities are not memory related but put here because they are closer to numa balance's page statistics. Or do you want me to submit a patch to move the items from memory.stat to cpu.stat? thanks, Chenyu > Michal