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b=qwegiPAqBJDHYdki9GckTC9d7DjFqcn6bwJyeMrOWH6ucPzALpHv4kIGOQG3ON3tI 2V2vvyklZV3XS1uak1yyTOgaE76TnfdGvrzIX1/OL1MUtqLFAJyx4IlqiQwWaO6HE2 OGrVzVjW/+9xv1zJaH5hEhJfUj2KXqwpz5kOSGl0= Date: Thu, 19 Feb 2026 14:11:16 -0800 From: Andrew Morton To: "JP Kobryn (Meta)" Cc: linux-mm@kvack.org, mst@redhat.com, mhocko@suse.com, vbabka@suse.cz, apopple@nvidia.com, 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, 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, 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 v4] mm: move pgscan, pgsteal, pgrefill to node stats Message-Id: <20260219141116.2cebbc75f4d79f06813d83a5@linux-foundation.org> In-Reply-To: <20260219171124.19053-1-jp.kobryn@linux.dev> References: <20260219171124.19053-1-jp.kobryn@linux.dev> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: 8wkdsirrsie5p45paraq96ar5zshimm3 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: F0429C0008 X-HE-Tag: 1771539090-913466 X-HE-Meta: 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 OuZv9Iv4 RIKL8Lkpg4YIpXihHEeXxFJbPYNTV8uFOjXpBKmFr3SA2wuYGOxtHk8bAgn+27Q+0o2yvYCbVrvyoQmjFO9qyOKCX6dxrMS33e8B5QR5+KCquU4wbeOgyT50rohYtqqmIbr6ha5bOIBjmOe88k9HS54t3Vwk5XBlSV0UFYguQ0fpm6tRwemMBR6IprhTBoQ07jCxSs9Wwoa1MbQ4IDJO1pwzto2CUiQEtsSENXncEIUuShcS7PSL3NEudhBIsgv/3MdL4G5Ywv+nT8vU8gyIS4W6LBrqGfHZo4iRmwRIB7/g/3AdqDDDp8aQFhrSFVuB7AzYiaRJ2LnctYcAU47kXdcF71PXWzMrTeuiysF+mRginTY8uVuTpXoboxw== 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 Thu, 19 Feb 2026 09:11:24 -0800 "JP Kobryn (Meta)" wrote: > There are situations where reclaim kicks in on a system with free memory. > One possible cause is a NUMA imbalance scenario where one or more nodes are > under pressure. It would help if we could easily identify such nodes. > > Move the pgscan, pgsteal, and pgrefill counters from vm_event_item to > node_stat_item to provide per-node reclaim visibility. With these counters > as node stats, the values are now displayed in the per-node section of > /proc/zoneinfo, which allows for quick identification of the affected > nodes. This runs afoul of https://lkml.kernel.org/r/20260123150108.43443-2-wujianyue000@gmail.com. Please redo against mm.git's mm-new branch?