From patchwork Tue Apr 20 12:13:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 12214107 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4789BC433ED for ; Tue, 20 Apr 2021 12:14:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F75761002 for ; Tue, 20 Apr 2021 12:14:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232084AbhDTMOh (ORCPT ); Tue, 20 Apr 2021 08:14:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:44402 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229943AbhDTMOf (ORCPT ); Tue, 20 Apr 2021 08:14:35 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 009ED613BF; Tue, 20 Apr 2021 12:13:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618920844; bh=L7f/Gd26ZNsxEmOWfRaBX+6S4MgGX4ZRI+QwZTF83kY=; h=From:To:Cc:Subject:Date:From; b=YAOW8mxenTWUNH8njZ7HYm0J2ny0f+JeEiq6RxZXCKJGjI+h+hCrw6hnHFCVkxfyo ksWQkGwoE9CjlOOgngDgRXzfMnPM6MQMHNExAG2zH/Wk8ZUmcaF4xysD3SR3/brk0A CkzVrwmi28DAUUYu31KOOaU172+NDkc/0TZlkDDn7rfGln25ccfYWiDd0PdFS5xd1f Yvwtsgf063Jf/FjUcD4eazthTSPEPuaCp7XPmB1QTo3rcm5xRL4vhyC7c7U2P2A8rt WudBYSV0fCgJK+qO7HKPokijKRnLAbNeVOinIUHuBwK7+2LfD6K1Ir298XH0X2HNgH Xo4xXeU67j7Jw== From: Mike Rapoport To: Jonathan Corbet Cc: Alexey Dobriyan , Andrew Morton , Eric Dumazet , Michal Hocko , Mike Rapoport , Mike Rapoport , linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org Subject: [PATCH v2] docs: proc.rst: meminfo: briefly describe gaps in memory accounting Date: Tue, 20 Apr 2021 15:13:54 +0300 Message-Id: <20210420121354.1160437-1-rppt@kernel.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Mike Rapoport Add a paragraph that explains that it may happen that the counters in /proc/meminfo do not add up to the overall memory usage. Signed-off-by: Mike Rapoport Acked-by: Michal Hocko --- v2: * Add brief changelog * Fix typo * Update example about network memory usage according to Eric's comment at https://lore.kernel.org/lkml/CANn89iKprp7WYeZy4RRO5jHykprnSCcVBc7Tk14Ui_MA9OK7Fg@mail.gmail.com v1: Link: https://lore.kernel.org/lkml/20210420085105.1156640-1-rppt@kernel.org Documentation/filesystems/proc.rst | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst index 48fbfc336ebf..8c77a491c436 100644 --- a/Documentation/filesystems/proc.rst +++ b/Documentation/filesystems/proc.rst @@ -929,8 +929,14 @@ meminfo ~~~~~~~ Provides information about distribution and utilization of memory. This -varies by architecture and compile options. The following is from a -16GB PIII, which has highmem enabled. You may not have all of these fields. +varies by architecture and compile options. Please note that it may happen +that the memory accounted here does not add up to the overall memory usage +and the difference for some workloads can be substantial. In many cases there +are other means to find out additional memory using subsystem specific +interfaces, for instance /proc/net/sockstat for TCP memory allocations. + +The following is from a 16GB PIII, which has highmem enabled. +You may not have all of these fields. ::