From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932264AbdJJO3f (ORCPT ); Tue, 10 Oct 2017 10:29:35 -0400 Received: from mga01.intel.com ([192.55.52.88]:12082 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932213AbdJJO3c (ORCPT ); Tue, 10 Oct 2017 10:29:32 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,505,1500966000"; d="scan'208";a="144851781" Subject: Re: [PATCH v3] mm, sysctl: make NUMA stats configurable To: Michal Hocko , kemi References: <1506579101-5457-1-git-send-email-kemi.wang@intel.com> <20171003092352.2wh2jbtt2dudfi5a@dhcp22.suse.cz> <221a1e93-ee33-d598-67de-d6071f192040@intel.com> <20171009075549.pzohdnerillwuhqo@dhcp22.suse.cz> <20171010054902.sqp6yyid6qqhpsrt@dhcp22.suse.cz> Cc: "Luis R . Rodriguez" , Kees Cook , Andrew Morton , Jonathan Corbet , Mel Gorman , Johannes Weiner , Christopher Lameter , Sebastian Andrzej Siewior , Vlastimil Babka , Tim Chen , Andi Kleen , Jesper Dangaard Brouer , Ying Huang , Aaron Lu , Proc sysctl , Linux MM , Linux Kernel From: Dave Hansen Message-ID: Date: Tue, 10 Oct 2017 07:29:31 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <20171010054902.sqp6yyid6qqhpsrt@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/09/2017 10:49 PM, Michal Hocko wrote: > On Mon 09-10-17 09:55:49, Michal Hocko wrote: >> I haven't checked closely but what happens (or should happen) when you >> do a partial read? Should you get an inconsistent results? Or is this >> impossible? > Well, after thinking about it little bit more, partial reads are always > inconsistent so this wouldn't add a new problem. > > Anyway I still stand by my position that this sounds over-engineered and > a simple 0/1 resp. on/off interface would be both simpler and safer. If > anybody wants an auto mode it can be added later (as a value 2 resp. > auto). 0/1 with the default set to the strict, slower mode?