From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 2B1286B0253 for ; Mon, 2 Oct 2017 11:45:43 -0400 (EDT) Received: by mail-pf0-f198.google.com with SMTP id a7so12847560pfj.3 for ; Mon, 02 Oct 2017 08:45:43 -0700 (PDT) Received: from mga05.intel.com (mga05.intel.com. [192.55.52.43]) by mx.google.com with ESMTPS id e1si7654769pgo.535.2017.10.02.08.45.42 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 02 Oct 2017 08:45:42 -0700 (PDT) Subject: Re: [PATCH] mm, swap: Make VMA based swap readahead configurable References: <20170926132129.dbtr2mof35x4j4og@dhcp22.suse.cz> <20170927050401.GA715@bbox> <20170927074835.37m4dclmew5ecli2@dhcp22.suse.cz> <20170927080432.GA1160@bbox> <20170927083512.dydqlqezh5polggb@dhcp22.suse.cz> <20170927131511.GA338@bgram> <20170927132241.tshup6kcwe5pcxek@dhcp22.suse.cz> <20170927134117.GB338@bgram> <20170927135034.yatxlhvunawzmcar@dhcp22.suse.cz> <20170927141008.GA1278@bgram> <20170927141723.bixcum3fler7q4w5@dhcp22.suse.cz> <87mv5f8wkj.fsf@yhuang-dev.intel.com> From: Dave Hansen Message-ID: Date: Mon, 2 Oct 2017 08:45:40 -0700 MIME-Version: 1.0 In-Reply-To: <87mv5f8wkj.fsf@yhuang-dev.intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: "Huang, Ying" , Michal Hocko Cc: Minchan Kim , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Johannes Weiner , Rik van Riel , Shaohua Li , Hugh Dickins , Fengguang Wu , Tim Chen On 09/27/2017 06:02 PM, Huang, Ying wrote: > I still think there may be a performance regression for some users > because of the change of the algorithm and the knobs, and the > performance regression can be resolved via setting the new knob. But I > don't think there will be a functionality regression. Do you agree? A performance regression is a regression. I don't understand why we are splitting hairs as to what kind of regression it is. Are you only willing to fix it if it's a functional regression? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org