From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761815AbYDQPUC (ORCPT ); Thu, 17 Apr 2008 11:20:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753760AbYDQPTy (ORCPT ); Thu, 17 Apr 2008 11:19:54 -0400 Received: from bzq-179-150-194.static.bezeqint.net ([212.179.150.194]:35029 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756139AbYDQPTx (ORCPT ); Thu, 17 Apr 2008 11:19:53 -0400 Message-ID: <48076A97.9060003@qumranet.com> Date: Thu, 17 Apr 2008 18:19:51 +0300 From: Avi Kivity User-Agent: Thunderbird 2.0.0.12 (X11/20080226) MIME-Version: 1.0 To: Jens Axboe CC: Paolo Valente , Pavel Machek , linux-kernel@vger.kernel.org Subject: Re: [RESEND][RFC] BFQ I/O Scheduler References: <20080401152903.GB34860@gandalf.sssup.it> <20080416184441.GA3923@ucw.cz> <4806EACB.7040408@unimore.it> <20080417071012.GP12774@kernel.dk> <480709A2.7040606@unimore.it> <20080417083047.GV12774@kernel.dk> In-Reply-To: <20080417083047.GV12774@kernel.dk> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jens Axboe wrote: > I was thinking about that too. Generally I've been opposed to doing > scheduling decisions on anything but time, since that is always > relevant. When to hand out slices and to what process, that algorithm is > really basic in CFQ and could do with an improvement. > Jumping in at random, does "process" here mean task or mms_struct? If the former, doesn't that mean that a 100-thread process can starve out a single-threaded process? Perhaps we need hierarchical io scheduling, like cfs has for the cpu. -- error compiling committee.c: too many arguments to function