linux-kernel - Re: [PATCH RFC 09/22] block, cfq: replace CFQ with the BFQ-v0 I/O scheduler

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Date:	Fri, 11 Mar 2016 03:49:27 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Nikolay Borisov <kernel@...p.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Tejun Heo <tj@...nel.org>,
	Paolo Valente <paolo.valente@...aro.org>,
	Jens Axboe <axboe@...nel.dk>,
	Fabio Checconi <fchecconi@...il.com>,
	Arianna Avanzini <avanzini.arianna@...il.com>,
	linux-block@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH RFC 09/22] block, cfq: replace CFQ with the BFQ-v0 I/O
 scheduler

On Fri, Mar 11, 2016 at 01:24:24PM +0200, Nikolay Borisov wrote:
> Out of curiosity - would it make sense to have something like BFQ/CFQ
> for single-queue blk-mq users?

The mess that CFQ is certainly not.  But we want to eventually be able
to get rid of the legacy request code, so we need suitable I/O
scheduling.  See the threads at: https://lkml.org/lkml/2015/11/19/227 or
http://thread.gmane.org/gmane.linux.scsi/111257/focus=111320 for more
details.  A leightweight bfq-like scheduler might come in handy on top
of Andreas' time slicing work.