From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f181.google.com (mail-dy1-f181.google.com [74.125.82.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CE85248176 for ; Thu, 12 Feb 2026 21:20:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.181 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770931240; cv=none; b=fUsx2e43e5I5ni7BDzOLDk8BZ+4HzFLs7bwMdJFxOv1a6Ng30jac2hYXa4n/b8cvlCCpbpwSpneTwUHHSftJ5QIjr5hp8BkpdFl8aiHk0k4zu+TFBSTr8ei3f7WQgFizdGnuv1VlWQYeq1mdJW/+hLxYsnEzV+yX5h+mpRdJwmc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770931240; c=relaxed/simple; bh=hhvIY42ZejyjgeuhGD0cdgJZcMf17AiRbGuBQYVvt5o=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=IT2ZJ4CjKmxcerf47xMnpv5H/XJ8bay/LRBWKpj6evSdGWjMtnxZGHACawkOJ5ickyH2rNEpeu49tIAppfjwaWBwpffg74HiIPKt3bUQQ9awRNrH2aVx1myqUHvmDIF9Z67jyJr0Q4BXIHWk3IvSolZpjUT9Y3w2Z0hECET2oOw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=kKcrHBKu; arc=none smtp.client-ip=74.125.82.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="kKcrHBKu" Received: by mail-dy1-f181.google.com with SMTP id 5a478bee46e88-2b785801c93so684947eec.0 for ; Thu, 12 Feb 2026 13:20:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1770931239; x=1771536039; darn=lists.linux.dev; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=m+vxOwDndj4zObe1CvOSxWnI7S8T1aXhKqAzJ6Mv/p0=; b=kKcrHBKuJ3VB44cXhO4jznBMec9ZtZ5n/psGhauAQTd/JjjuxZGFUDpD+faIlaFMwn fCu3m0EnFLMOY78Mp8o7Gp50EdCFZXASq2leAN6OAwKg8jBccixCRgKqLL6Ys+6Rrxl7 yyf0pNQq/iVLzliOIFkVFqLIBxMlX9J+Bf/faQtUdF9mxz2JGZeQbZIWGcefUc8ltrBb XaW8yXbmwX85G/rq2TsnK5D4ovXA6uPPweDKStdKtXpB/3+AaulXd4/wcvRzOpRA0k5x 8gVpcR+zcnPvFmpnpdOqA9965i0Kq0xvHj3aSvrE5iLWYhSTJwV6LlJc1c98eBCTG8+h GGNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770931239; x=1771536039; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=m+vxOwDndj4zObe1CvOSxWnI7S8T1aXhKqAzJ6Mv/p0=; b=kgp0+UY3ahkBETtmiMkTsBX4Nrru/ZZ6+5ZeOaeB78okhSWxJl2wV+SeVrbgls4y+2 3SiA4+z4Qxfrwbll7wTVTMSkKlnHKIqJGLSWlEsga7KEVrtSG+PWjny4dXMqu0NLlim6 Xpeld1dO/207bHTe+3Ruv8X5/bOXZMOlpgLu9WVUic9nDjOYmQl9DoamjxN54tUhdJu+ sVWAWTu3pE7XXhvHsixT5/tTi3N6/4d4A7N6GsLog+eNr6r1wvepKUoX0RhMQRFwuTEb aEosZowLwEOArWN9ZedzCBckJNZnD5UJlhqiIeFe9H44ysk+fj8xhxB2Nkn7rNrtAi7I mjHg== X-Forwarded-Encrypted: i=1; AJvYcCXOSuNyCc/9F0wAZABB1zlDXX0AlPpHIEPthG6sDEYYRk/hReclM20e30SK9nhtjGTre6ziMp1mRJF1mlaRzQ==@lists.linux.dev X-Gm-Message-State: AOJu0YylOWLvpUrqoht/AANp/X6+6Zv20X2Kk3kqYXMggIGbcFO5ns7e kdZf/yzK6j9LE58nH8yi4gZvJyAKBuDWvTXznefJrCWjJm1QEtjvJtJe X-Gm-Gg: AZuq6aIIUzYwi2wmmhfjyGTbeozmbcOvSSGXqf34cPC42gVMDOpFXUwHD6r/9lvEjKF uJ3820nKaOS++Iy1IFB51T1cpbbl/JjsT65EPHdHi/dhdyZS5/8AVhU6NtLIBq+zFyOgwpZtuy/ iphi+7QPBTLCDg8kJOCcGm4Vvh74sg21HH1eB4LVe4XdT2PMPcaVr/S+Gtpr0l21cvCj+VOfB+7 sz1IbAm/OvSoXGH4Xk9Lt6iiB3KVflJtcHT621BU6eBhTQWL3Vq6EvI4AocBxx6cPwqVEOe+ZOy xY1ynO1cJ0V3gKeMSooCZ/WnlysILLv25Mk2B9l+YCqxz/MXcraEJKYSve/ps0x1h53QjV3PzEC 4n2cvWYtxm24jgj0VX40dpHMM5l0G/KmIHNnKPesP4OxHuNwzsVWDgAG45c0sRr64Nj1+QQwAA5 eplVyB6e4G6vzqYlOFbKfyHPF6shfunSpdiISavYIo8Iw= X-Received: by 2002:a05:7022:250f:b0:11b:9386:a3bf with SMTP id a92af1059eb24-1273985be5cmr198075c88.42.1770931238369; Thu, 12 Feb 2026 13:20:38 -0800 (PST) Received: from [192.168.4.196] ([73.222.117.172]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1272a6942ccsm6165153c88.3.2026.02.12.13.20.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); 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: virtualization@lists.linux.dev 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.