From: Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 03/23] io-controller: Common flat fair
 queuing code in elevaotor layer
Date: Fri, 28 Aug 2009 21:29:23 -0400
Message-ID: <4A988473.7010208@redhat.com>
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To: Vivek Goyal <vgoyal@redhat.com>
Cc: dhaval@linux.vnet.ibm.com, peterz@infradead.org, dm-devel@redhat.com, dpshah@google.com, jens.axboe@oracle.com, agk@redhat.com, balbir@linux.vnet.ibm.com, paolo.valente@unimore.it, jmarchan@redhat.com, guijianfeng@cn.fujitsu.com, fernando@oss.ntt.co.jp, mikew@google.com, jmoyer@redhat.com, nauman@google.com, mingo@elte.hu, m-ikeda@ds.jp.nec.com, lizf@cn.fujitsu.com, fchecconi@gmail.com, s-uchida@ap.jp.nec.com, containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, righi.andrea@gmail.com, torvalds@linux-foundation.org
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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 <nauman@google.com>
> Signed-off-by: Fabio Checconi <fabio@gandalf.sssup.it>
> Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
> Signed-off-by: Aristeu Rozanski <aris@redhat.com>
> Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
> Signed-off-by: Vivek Goyal <vgoyal@redhat.com>

Acked-by: Rik van Riel <riel@redhat.com>

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