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

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Message-ID: <20160311111636.GB3450@infradead.org>
Date:	Fri, 11 Mar 2016 03:16:36 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	"Austin S. Hemmelgarn" <ahferroin7@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Linus Walleij <linus.walleij@...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>,
	Ulf Hansson <ulf.hansson@...aro.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 04, 2016 at 01:10:31PM -0500, Austin S. Hemmelgarn wrote:
> 1. This all started long before blk-mq hit mainline.

Whoe cares? :)

> 2. There's still a decent amount of block drivers that don't support blk-mq.
> Last time I looked (around the time 4.4 came out), I saw the following that
> either obviously don't support it, or are ambiguous as to whether they
> support it or not.  Here's a list of just the ones I know are being used on
> existing systems running relatively recent kernel versions, not including

There is no ambiguouity.  You clearly named a few ones that aren't
converted, but also a lot of make_request_fn based drivers which don't
support any I/O scheduler.

But that whole point is that anything actively developed should move
over.