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

From: Richard Weinberger
Date: Fri Oct 28 2016 - 08:18:13 EST

On Fri, Oct 28, 2016 at 2:07 PM, Arnd Bergmann <arnd@xxxxxxxx> 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.
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.