linux-kernel - Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler

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Date:   Fri, 28 Oct 2016 14:17:28 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, Jens Axboe <axboe@...nel.dk>,
        Paolo Valente <paolo.valente@...aro.org>,
        Christoph Hellwig <hch@...radead.org>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Jan Kara <jack@...e.cz>, Tejun Heo <tj@...nel.org>,
        linux-block@...r.kernel.org,
        Linux-Kernal <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Hannes Reinecke <hare@...e.de>,
        Grant Likely <grant.likely@...retlab.ca>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Daniel Walter <dwalter@...ma-star.at>,
        Anton Ivanov <anton.ivanov@...-begemot.co.uk>
Subject: Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler

On Fri, Oct 28, 2016 at 2:07 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> > I don't think that's an accurate statement. In terms of coverage, most
>> > drivers do support blk-mq. Anything SCSI, nvme, virtio-blk, SATA runs on
>> > (or can run on) top of blk-mq.
>>
>> Well, I just used "git grep" and found that many drivers didn't use
>> blkmq. Apologize if I gave the wrong impressions.
>
> To clarify, this seems to be a complete list:
>
> $ git grep -wl '\(__\|\)blk_\(fetch\|end\|start\)_request' | xargs grep -L blk_mq
> Documentation/scsi/scsi_eh.txt
> arch/um/drivers/ubd_kern.c

AFAICT Daniel looked at the UML block driver and did an initial
conversion some time ago.
Daniel?
Anton is also working on a patch series to speed up the driver.
Maybe it is time to bite the bullet and do the conversion.

-- 
Thanks,
//richard