From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751430AbZH2BaP (ORCPT ); Fri, 28 Aug 2009 21:30:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751127AbZH2BaO (ORCPT ); Fri, 28 Aug 2009 21:30:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47217 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751106AbZH2BaN (ORCPT ); Fri, 28 Aug 2009 21:30:13 -0400 Message-ID: <4A988473.7010208@redhat.com> Date: Fri, 28 Aug 2009 21:29:23 -0400 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Thunderbird 2.0.0.17 (X11/20080915) MIME-Version: 1.0 To: Vivek Goyal CC: linux-kernel@vger.kernel.org, jens.axboe@oracle.com, containers@lists.linux-foundation.org, dm-devel@redhat.com, nauman@google.com, dpshah@google.com, lizf@cn.fujitsu.com, mikew@google.com, fchecconi@gmail.com, paolo.valente@unimore.it, ryov@valinux.co.jp, fernando@oss.ntt.co.jp, s-uchida@ap.jp.nec.com, taka@valinux.co.jp, guijianfeng@cn.fujitsu.com, jmoyer@redhat.com, dhaval@linux.vnet.ibm.com, balbir@linux.vnet.ibm.com, righi.andrea@gmail.com, m-ikeda@ds.jp.nec.com, agk@redhat.com, akpm@linux-foundation.org, peterz@infradead.org, jmarchan@redhat.com, torvalds@linux-foundation.org, mingo@elte.hu Subject: Re: [PATCH 03/23] io-controller: Common flat fair queuing code in elevaotor layer References: <1251495072-7780-1-git-send-email-vgoyal@redhat.com> <1251495072-7780-4-git-send-email-vgoyal@redhat.com> In-Reply-To: <1251495072-7780-4-git-send-email-vgoyal@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Vivek Goyal wrote: > This is common fair queuing code in elevator layer. This is controlled by > config option CONFIG_ELV_FAIR_QUEUING. This patch initially only introduces > flat fair queuing support where there is only one group, "root group" and all > the tasks belong to root group. > > This elevator layer changes are backward compatible. That means any ioscheduler > using old interfaces will continue to work. > > This is essentially a lot of CFQ logic moved into common layer so that other > IO schedulers can make use of that in hierarhical scheduling setup. > > Signed-off-by: Nauman Rafique > Signed-off-by: Fabio Checconi > Signed-off-by: Paolo Valente > Signed-off-by: Aristeu Rozanski > Signed-off-by: Gui Jianfeng > Signed-off-by: Vivek Goyal Acked-by: Rik van Riel -- All rights reversed.