From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68FDFCA5506 for ; Thu, 14 Sep 2023 13:00:30 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C3E346B02B6; Thu, 14 Sep 2023 09:00:29 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BBB8C6B02B8; Thu, 14 Sep 2023 09:00:29 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A5C7E6B02B6; Thu, 14 Sep 2023 09:00:29 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 95F0E6B0182 for ; Thu, 14 Sep 2023 09:00:29 -0400 (EDT) Received: from smtpin21.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 4E06BB41F0 for ; Thu, 14 Sep 2023 13:00:29 +0000 (UTC) X-FDA: 81235211778.21.567A48E Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf26.hostedemail.com (Postfix) with ESMTP id 54728140034 for ; Thu, 14 Sep 2023 13:00:25 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=LxeHjQgw; spf=pass (imf26.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1694696425; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=GD4InApqGwPlaqPD1j+cPsIFJ/FaN83LoGbvPs5/BZM=; b=Z0iTqUWWz8YieWt/4g203p6wegc7jLIktq+BxKI4qtUvegCSQISqeepFXTuXdeOD8XlAb7 UWgE4dFMK4PpbbkNwCfhsE8zeVl6u57AZHDGctY565MV8kGFMTATX15ANeoU7ja3sKsLqH Yum9R7P1mNJnVAB8MBsEra/PNz5RbGI= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=LxeHjQgw; spf=pass (imf26.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1694696425; a=rsa-sha256; cv=none; b=sc54sVqP2PQUn4lcHsqYPbdfxWTvAXUb5GMql/JkGCGS3RcSzyTCGxW57yW7s8H1wjyjtr Pe50M6+AX8dZ5MrB0B7WraLu47TynPIhcwoQ5KVp+O+RD2We8+BSWnoHRI/ZoOCClZ9IbD oLFz6epQdRMGiQ1Z5MqxUYbw8LmK1yQ= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1694696424; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GD4InApqGwPlaqPD1j+cPsIFJ/FaN83LoGbvPs5/BZM=; b=LxeHjQgwxQn2ffZZ/0zJu0mRCLlPRUBpMmNFbDkT56OEhj/dm6PW0s8D6aorebIZs7mElO e1BX23xmUd4jxuocQtHAbBpO3N0vTa2NF2y6bYtB82VWtxZFczmejI5p7CSw8pdeqpwdFa j1S8bNszaMcVai8VY7xZ/+kIQnOnsiY= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-220-nDiTOgwLOdO0mw-JqnoUDg-1; Thu, 14 Sep 2023 09:00:22 -0400 X-MC-Unique: nDiTOgwLOdO0mw-JqnoUDg-1 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-40298cbbcdbso7016715e9.3 for ; Thu, 14 Sep 2023 06:00:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1694696421; x=1695301221; h=content-transfer-encoding:in-reply-to:organization:from:references :to:content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=GD4InApqGwPlaqPD1j+cPsIFJ/FaN83LoGbvPs5/BZM=; b=XNIjIx3wFTn4Z0qciJ+YPyRBnXXDDvGQKhQ4hzjz0Wnr+RuK0HvxJG+9OvS37kFqg8 nimNzI6Il0UVgr4TxkZ+02ow5aPpdUXvNY4o/+FequVMklDWUX7WCXu+tpHhJUfmao5Z kWXkvMu6cTLS9/AsjrKjn9Vjlq85RLZru8fwTU0QtzIODYHphW4+japggthMevsAZrQd mo6PkstWrm+wTMB6HNMPY2yx2EoghxMycWONMvVGqPx3Y5JZc1m2YMPAtTFkua4FzVWK 6OTI+6sH39QDdh9yQn/BQ6kasnh0+f9K5fYShM1RQ1HwxdGZrzG1WiDTdcYey0aOWxyE miDA== X-Gm-Message-State: AOJu0YzGLVw7lRjMyQgqsOYfpypF8MecGns8aRky+Kfu38bmfXa+AP6E oZDlL5c4j5O+LxO5Ar96V9BdRAPCE0pDQXYD7d70X9vL21PqnRnNp815CfWNcfT3SgxggOgLy9S fevMYDdCfNGU= X-Received: by 2002:a1c:7c08:0:b0:3fd:2e89:31bd with SMTP id x8-20020a1c7c08000000b003fd2e8931bdmr4909332wmc.14.1694696421060; Thu, 14 Sep 2023 06:00:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEyAuCfFyUyVDVL0z0/uh6CoJRANuY+BSorx+ortm8WCPKSWcX0US0Dzyy1Y66VZIZ/zKjomA== X-Received: by 2002:a1c:7c08:0:b0:3fd:2e89:31bd with SMTP id x8-20020a1c7c08000000b003fd2e8931bdmr4909307wmc.14.1694696420636; Thu, 14 Sep 2023 06:00:20 -0700 (PDT) Received: from ?IPV6:2a09:80c0:192:0:5dac:bf3d:c41:c3e7? ([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id g13-20020a7bc4cd000000b003fc02e8ea68sm4810805wmk.13.2023.09.14.06.00.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Sep 2023 06:00:20 -0700 (PDT) Message-ID: <5d6a780e-2945-2b24-bca6-3e38565fe157@redhat.com> Date: Thu, 14 Sep 2023 15:00:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH v1 1/1] mm: report per-page metadata information To: Sourav Panda , corbet@lwn.net, gregkh@linuxfoundation.org, rafael@kernel.org, akpm@linux-foundation.org, mike.kravetz@oracle.com, muchun.song@linux.dev, rppt@kernel.org, rdunlap@infradead.org, chenlinxuan@uniontech.com, yang.yang29@zte.com.cn, tomas.mudrunka@gmail.com, bhelgaas@google.com, ivan@cloudflare.com, pasha.tatashin@soleen.com, yosryahmed@google.com, hannes@cmpxchg.org, shakeelb@google.com, kirill.shutemov@linux.intel.com, wangkefeng.wang@huawei.com, adobriyan@gmail.com, vbabka@suse.cz, Liam.Howlett@Oracle.com, surenb@google.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org References: <20230913173000.4016218-1-souravpanda@google.com> <20230913173000.4016218-2-souravpanda@google.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230913173000.4016218-2-souravpanda@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 54728140034 X-Rspam-User: X-Stat-Signature: m3r4ksybuo6ddsypih84gtmouh9s71bk X-Rspamd-Server: rspam01 X-HE-Tag: 1694696425-993701 X-HE-Meta: U2FsdGVkX19FeRaTFqff5pITjuBYDyc00IaAkpLqtXCGxeYuh57mQu2d5ekyuXQfzixDG5USoeY09P/J4kQjDtderwwz9pvza2tNnHqywPgqBzNEm+jOkphH4Kx8lxsAp56eCNpEieP4OTMD2+IS+QyQSIDW20dI49gLVzbuctveMn9UyGof5e5ISTg0/GM3wfiwjWtg58vLIdUMM2u4Ury4LtaU5EIdWX+Z4K97Dvr4ClOYhz09FykSo2IYyOIxoRkOHcriIxDqV8gjasI3XRObX683RYD/gMbC/jEmhZjgAdO0zDbTP6TZsWvyDczptixYlHdu/QIn0eQ8W9Hb7VB15d/xH7YqIPxYJ4MZUkSb1wxnXDUD5T/m29HOfhY6KUq1SVhCWC1WFKK0UCWmp17S4nRENeqS8BaM/cBOf7eJncx8j3XyclqPC8M3gveH0qkInmfBc9y3POAlFe/hC7KZ+6S6o1JzOGEDSnTEbhe+amYBkyc2XnUH7rJ1ecwFZdlN8aBLpVKv3ZAXEadHHn/muW3oKIBB5Tv/3osVojVSeXa7kUu7SXwLfAx39c+r6hfCRDsg1SJYez2ZK2PZbBXnOtnAAvKBTq18yRXf8tp4giJO1M+j+mJRUKNEbXhWyUyzWJ920pXfEKpFXOC7EopM04DCid/KB4SmwPCBl28JyN3Cl7Rx0UxC5aux9WWlKGMWcYsizLLhKTlcrSylCCcdfn8Ddz+9/s4iqhmFSeT50fIYnxa6U0geNMlE0rDJFUhEVEFbpm1nEOU6YBqEBaMTE808RTSVud0YtahCNum52r0xN02Fj07t4M+iVbwzBMwend6hU47ILZmTWXcTSSM0szbhefx012SfQzl+FUGLONaKEqKAHoSxcTk2mYF2HJ82A0AEj2L5/5TDEA6W63zMfzmu2ZvU3j1Q4k8Fn00AUR29JhqzkUSj2SuA6INgjLBhqgwVW1Dnar2NZOo /gqPOHzm I/TNiyDT9OFlIl0VjhKC5Nt4opWiLRW89MOfIN6nBchi/vYtw3K25+KeaetpmUyET/81/8i2NxAmh8PNsvEZUHiFS/N/Y6j51MglBSAjw9FBpDGFk6UbjXYrloEYvISV1KMWOwrNVF/zZsklDoEJOGlTeKbqWleXumHVln2b/O9BI6vzNY2f7VjX9cErxq2dryttKVq0MLdfPFbx4rmsqXC9lKlK5mlbFeBKlIcp+UmOJ9qtKWeN6JoGXEyI3tPZPEgGeX8DAT5PDaoF2jB+jRRJLNrKgC8qDYsLWfRdzKVWW+gdq0jKNY9qzMwYrwMpUumxqpw1l72p6OuaT62ZT3rhwyhIrYZncnxdzzJIJrtZ3b1RGe75uziS3C5HtzfXxppfutiTgYBUwi5GQwsjN0sD3xJAI48yMT9xmKk6C+9i0+ofQ5ubzln3gGZMAF9yp9Ew9xCgYSZwnFFc= 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: On 13.09.23 19:30, Sourav Panda wrote: > Adds a new per-node PageMetadata field to > /sys/devices/system/node/nodeN/meminfo > and a global PageMetadata field to /proc/meminfo. This information can > be used by users to see how much memory is being used by per-page > metadata, which can vary depending on build configuration, machine > architecture, and system use. > > Per-page metadata is the amount of memory that Linux needs in order to > manage memory at the page granularity. The majority of such memory is > used by "struct page" and "page_ext" data structures. It's probably worth mentioning, that in contrast to most other "memory consumption" statistics, this metadata might not be included "MemTotal"; when the memmap is allocated using the memblock allocator, it's not included, when it's dynamically allocated using the buddy (e.g., memory hotplug), it's included. -- Cheers, David / dhildenb