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Tue, 17 Jun 2025 02:30:21 -0700 (PDT) Received: from blackdock.suse.cz ([193.86.92.181]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a568a800d9sm13275459f8f.45.2025.06.17.02.30.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Jun 2025 02:30:21 -0700 (PDT) Date: Tue, 17 Jun 2025 11:30:19 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: "Chen, Yu C" Cc: Shakeel Butt , peterz@infradead.org, akpm@linux-foundation.org, mingo@redhat.com, tj@kernel.org, hannes@cmpxchg.org, corbet@lwn.net, mgorman@suse.de, mhocko@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, tim.c.chen@intel.com, aubrey.li@intel.com, libo.chen@oracle.com, kprateek.nayak@amd.com, vineethr@linux.ibm.com, venkat88@linux.ibm.com, ayushjai@amd.com, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, yu.chen.surf@foxmail.com Subject: Re: [PATCH v5 2/2] sched/numa: add statistics of numa balance task Message-ID: References: <7ef90a88602ed536be46eba7152ed0d33bad5790.1748002400.git.yu.c.chen@intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; 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protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v5 2/2] sched/numa: add statistics of numa balance task MIME-Version: 1.0 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. Altho= ugh > 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): >=20 > 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. =46rom your reasoning above, I think that the concept is closer to be in cpu.stat =C2=AF\_(=E3=83=84)_/=C2=AF Michal --q522php5dxz4ohq7 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCaFE1qQAKCRB+PQLnlNv4 CAvDAQClJdOJ0v+nc22UzxOE8RNWod98jZVrUDcK730qHKFJJwEA18yLv+cZIXXl mdhsA08UxzTGxv2zWwOY5iIzS+UDGQc= =CM6f -----END PGP SIGNATURE----- --q522php5dxz4ohq7--