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[195.250.132.146]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42ac679c5dcsm38723673f8f.44.2025.11.12.06.02.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Nov 2025 06:02:14 -0800 (PST) Date: Wed, 12 Nov 2025 15:02:12 +0100 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Chen Ridong Cc: Leon Huang Fu , akpm@linux-foundation.org, cgroups@vger.kernel.org, corbet@lwn.net, hannes@cmpxchg.org, jack@suse.cz, joel.granados@kernel.org, kyle.meyer@hpe.com, lance.yang@linux.dev, laoar.shao@gmail.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mclapinski@google.com, mhocko@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, shakeel.butt@linux.dev, tj@kernel.org Subject: Re: [PATCH mm-new v3] mm/memcontrol: Add memory.stat_refresh for on-demand stats flushing Message-ID: References: <7d46ef17-684b-4603-be7a-a9428149da05@huaweicloud.com> <20251111064415.75290-1-leon.huangfu@shopee.com> <2f43bdf7-5ce0-4835-9e60-39d91f637152@huaweicloud.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="qrv7ktcycf6a43eq" Content-Disposition: inline In-Reply-To: <2f43bdf7-5ce0-4835-9e60-39d91f637152@huaweicloud.com> X-Rspamd-Queue-Id: 2918018001A X-Stat-Signature: 4mqt5fy95middrnszs6iiozn7ok53igo X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1762956135-545240 X-HE-Meta: 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 cyVTqFUR 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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: --qrv7ktcycf6a43eq Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH mm-new v3] mm/memcontrol: Add memory.stat_refresh for on-demand stats flushing MIME-Version: 1.0 On Wed, Nov 12, 2025 at 08:56:28AM +0800, Chen Ridong wrote: > However, this fails the LTP test quite easily. The error logs come direct= ly from LTP. The issue > occurs because the threshold isn=E2=80=99t reached, resulting in an RSS v= alue of 0. We tried increasing the > memory allocated by the LTP case, but that wasn=E2=80=99t the right solut= ion. You touched on a slightly different cause (other than async flushing) -- there are other fields/stats that are quantified by (basic) page size. I.e. I think that might need different/more central solution, e.g. working with absolute (not relative to pagesize) thresholds if absolute precision is needed. Thanks, Michal --qrv7ktcycf6a43eq Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJEEABYKADkWIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCaRSTYhsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMSwyLDIACgkQfj0C55Tb+AiSagD/WULk3YU+JZ1RgyrGtBcK Rk5AScqXYcflK31hxM9Cw9UA/3e8l571U4YVUYXkPQ44w97Y1nTKbxU0rJ7BHri1 sywP =pSJv -----END PGP SIGNATURE----- --qrv7ktcycf6a43eq--