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[109.81.87.131]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4834d5e0ed5sm164667535e9.5.2026.02.11.23.29.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Feb 2026 23:29:54 -0800 (PST) Date: Thu, 12 Feb 2026 08:29:52 +0100 From: Michal Hocko To: JP Kobryn Cc: linux-mm@kvack.org, apopple@nvidia.com, akpm@linux-foundation.org, axelrasmussen@google.com, byungchul@sk.com, cgroups@vger.kernel.org, david@kernel.org, eperezma@redhat.com, gourry@gourry.net, jasowang@redhat.com, hannes@cmpxchg.org, joshua.hahnjy@gmail.com, Liam.Howlett@oracle.com, linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com, matthew.brost@intel.com, mst@redhat.com, rppt@kernel.org, muchun.song@linux.dev, zhengqi.arch@bytedance.com, rakie.kim@sk.com, roman.gushchin@linux.dev, shakeel.butt@linux.dev, surenb@google.com, virtualization@lists.linux.dev, vbabka@suse.cz, weixugc@google.com, xuanzhuo@linux.alibaba.com, ying.huang@linux.alibaba.com, yuanchu@google.com, ziy@nvidia.com, kernel-team@meta.com Subject: Re: [PATCH 1/2] mm/mempolicy: track page allocations per mempolicy Message-ID: References: <20260212045109.255391-1-inwardvessel@gmail.com> <20260212045109.255391-2-inwardvessel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260212045109.255391-2-inwardvessel@gmail.com> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 1161E20005 X-Stat-Signature: b1u7oeqn9b3c9yoxqcg9js4mc6dq1y5k X-Rspam-User: X-HE-Tag: 1770881395-340637 X-HE-Meta: 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 +PrD6IKa ANFtVzKvQha1EXJCU7JeBg93Vy3+2+cjRPBrp0+zrQUGROH/8y20jusnnoDlY4K2c4TTLRjOJBrMcKMd87VF/NwqYZ+hWUbSuNqdtmVJpkOYhLd6I99DcN7OVxOcWVpLt4/dfjW7XJd2xtXJ7AX2JJNvbBhiXt3/2jywNqobNGBe+ICcFPdoa3kBKLm0+HS4qL1vGskMtbjkFRvF8XJXX2xFVL5XhhhzOgKmn0dZoDvlS2CC2Xzsv8wFl6F/VNx8iYujlzl5HI7zMU2IpqTcrPIcfupA1tTu+kV/OWGyUrt6APhkkQf1NMiKIScV3HobV0D5NdFdX+hPOXflgOOX3QYCB32CylPUBPOk+z6A3idvdC4DtswxktD/8YRHbm3lBO1e3O0aJZm+KfWOt37tH141aSyXPpQq53C90jiLr9ClcuwE= 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 Wed 11-02-26 20:51:08, JP Kobryn wrote: > It would be useful to see a breakdown of allocations to understand which > NUMA policies are driving them. For example, when investigating memory > pressure, having policy-specific counts could show that allocations were > bound to the affected node (via MPOL_BIND). > > Add per-policy page allocation counters as new node stat items. These > counters can provide correlation between a mempolicy and pressure on a > given node. Could you be more specific how exactly do you plan to use those counters? -- Michal Hocko SUSE Labs