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 X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 C4FA0C43331 for ; Thu, 2 Apr 2020 06:27:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 911EA206D3 for ; Thu, 2 Apr 2020 06:27:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 911EA206D3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 203738E000C; Thu, 2 Apr 2020 02:27:21 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1B3638E0008; Thu, 2 Apr 2020 02:27:21 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0C8D28E000C; Thu, 2 Apr 2020 02:27:21 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0242.hostedemail.com [216.40.44.242]) by kanga.kvack.org (Postfix) with ESMTP id E882C8E0008 for ; Thu, 2 Apr 2020 02:27:20 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id A2CBA180AD80F for ; Thu, 2 Apr 2020 06:27:20 +0000 (UTC) X-FDA: 76661933040.08.mind02_7a4d624d4e540 X-HE-Tag: mind02_7a4d624d4e540 X-Filterd-Recvd-Size: 3325 Received: from mail-wm1-f68.google.com (mail-wm1-f68.google.com [209.85.128.68]) by imf08.hostedemail.com (Postfix) with ESMTP for ; Thu, 2 Apr 2020 06:27:20 +0000 (UTC) Received: by mail-wm1-f68.google.com with SMTP id z7so2115291wmk.1 for ; Wed, 01 Apr 2020 23:27:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=IfLSMTLTvFoZT1dG8FvLcXK5lHsPjnFY8JvpK5zcfB4=; b=FiAHr0i8pNAAEnLf6gSSpyuDKcDv8vJi+o6sQb3tZ2R8Y7vehVE04GJPp8x9t3Eivz d02HSxvoe5MidHkt6jJVEG2E/hzV5dE86SR4ii+A00QrEXE/jDa9ZbfFqNHZsvcKJTQV wMbc0BGr4F+ou5M2G00vfO3mCT6TikmsxLcmr9wGLdjr4kiDTXyCAJcO7xO7Thy/NtGz 8081ELMJslI1X0D8UhXdH4UVYZtY2NjARUSWa61bPZLToyWvceP+V0q7+CUQqiIJjdo7 JoHjwaf3m9edMOZQys/WglIp0QEPXrnhKMfhXppTR15RabWe+3hdrL9EJAex9Bv3gwyu nwjA== X-Gm-Message-State: AGi0PuZoPSZfEmjFu+V4gWeluxzB4LMr5nKjnrKxRZ9KUQ8Cuq46+irl tZKKtgCYTTOVlnKnebr3FXw= X-Google-Smtp-Source: APiQypLCmObbZHMa6hacnQUpup7IVI8EkFLyfmjFSFj3sVOOoLer0cmjEyb2LuDkAo0RAWWCKogzVw== X-Received: by 2002:a1c:7e43:: with SMTP id z64mr1714424wmc.45.1585808839220; Wed, 01 Apr 2020 23:27:19 -0700 (PDT) Received: from localhost (ip-37-188-180-223.eurotel.cz. [37.188.180.223]) by smtp.gmail.com with ESMTPSA id q8sm6709154wrc.8.2020.04.01.23.27.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Apr 2020 23:27:18 -0700 (PDT) Date: Thu, 2 Apr 2020 08:27:17 +0200 From: Michal Hocko To: Andrew Morton Cc: "Huang, Ying" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrea Arcangeli , "Kirill A . Shutemov" , Zi Yan , Vlastimil Babka , Alexey Dobriyan , Konstantin Khlebnikov , =?iso-8859-1?B?Suly9G1l?= Glisse , Yang Shi Subject: Re: [PATCH] /proc/PID/smaps: Add PMD migration entry parsing Message-ID: <20200402062717.GB22681@dhcp22.suse.cz> References: <20200331085604.1260162-1-ying.huang@intel.com> <20200401160432.855bba5b210c7b4bbf6c56ef@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200401160432.855bba5b210c7b4bbf6c56ef@linux-foundation.org> 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 Wed 01-04-20 16:04:32, Andrew Morton wrote: > On Tue, 31 Mar 2020 16:56:04 +0800 "Huang, Ying" wrote: > > > From: Huang Ying > > > > Now, when read /proc/PID/smaps, the PMD migration entry in page table is simply > > ignored. To improve the accuracy of /proc/PID/smaps, its parsing and processing > > is added. > > It would be helpful to show the before-and-after output in the changelog. Migration entries are ephemeral. Is this observable in practice? I suspect this is just primarily motivated by reading the code more than hitting the actual problem. -- Michal Hocko SUSE Labs