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Thu, 12 Feb 2026 13:20:38 -0800 (PST) Message-ID: Date: Thu, 12 Feb 2026 13:20:35 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] mm: move pgscan and pgsteal to node stats To: Michal Hocko 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 References: <20260212045109.255391-1-inwardvessel@gmail.com> <20260212045109.255391-3-inwardvessel@gmail.com> Content-Language: en-US From: JP Kobryn In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/11/26 11:29 PM, Michal Hocko wrote: > On Wed 11-02-26 20:51:09, JP Kobryn wrote: >> It would be useful to narrow down reclaim to specific nodes. >> >> Provide per-node reclaim visibility by changing the pgscan and pgsteal >> stats from global vm_event_item's to node_stat_item's. Note this change has >> the side effect of now tracking these stats on a per-memcg basis. > > The changelog could have been more clear about the actual changes as > this is not overly clear for untrained eyes. The most important parts > are that /proc/vmstat will preserve reclaim stats with slightly > different counters ordering (shouldn't break userspace much^W), per-node > stats will be now newly displayed in /proc/zoneinfo - this is presumably > the primary motivation to have a better insight of per-node reclaim > activity, and memcg stats will now show their share of the global memory > reclaim. > > Have I missed anything? That's accurate. Plus aside from reading /proc/zoneinfo they will also be in /sys/devices/system/node/nodeN/vmstat. I see I could have been more explicit about this. Let me make additions to the changelog in v2. Thanks for taking a look.