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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 A6671C47E49 for ; Wed, 23 Oct 2019 12:04:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7B013214B2 for ; Wed, 23 Oct 2019 12:04:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571832297; bh=UjqborfkvaFg/el+L2SfponqB7+Po+juyp0arLqlCEQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=I5Kv65DVMg0rOMc0DgR0sh7mVQbcNqIC0Cuplsh+E90BKvxk0kmysJq6PJV8GH7Uq jFy93/11QC9lPRKwM7Sw9ncEDgzwPZBDpcUmO1yjmcyZ/wNf6hO33SirEC88Pd8b6T 5JpzPq21XzhzByKpIYc3OGr3otO4cFoskA1NItvM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405207AbfJWME4 (ORCPT ); Wed, 23 Oct 2019 08:04:56 -0400 Received: from mx2.suse.de ([195.135.220.15]:44586 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730034AbfJWME4 (ORCPT ); Wed, 23 Oct 2019 08:04:56 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 5E655AC4A; Wed, 23 Oct 2019 12:04:54 +0000 (UTC) Date: Wed, 23 Oct 2019 14:04:52 +0200 From: Michal Hocko To: Hillf Danton Cc: linux-mm , Andrew Morton , linux-kernel , Johannes Weiner , Shakeel Butt , Minchan Kim , Mel Gorman , Vladimir Davydov , Jan Kara Subject: Re: [RFC v1] mm: add page preemption Message-ID: <20191023120452.GN754@dhcp22.suse.cz> References: <20191022142802.14304-1-hdanton@sina.com> <20191023115350.4956-1-hdanton@sina.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191023115350.4956-1-hdanton@sina.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 23-10-19 19:53:50, Hillf Danton wrote: > > On Wed, 23 Oct 2019 10:17:29 +0200 Michal Hocko wrote: [...] > > This doesn't really answer my question. > > Why cannot you use memcgs as they are now. > > No prio provided. > > > Why exactly do you need a fixed priority? > > Prio comparison in global reclaim is what was added. Because every task has > prio makes that comparison possible. That still doesn't answer the question because it doesn't explain why is the priority really necessary. I am sorry but I have more important things to deal with than asking the same question again and again. -- Michal Hocko SUSE Labs