linux-kernel - Re: [Ksummit-2013-discuss] [ATTEND] scsi-mq prototype discussion

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Date:	Sat, 13 Jul 2013 06:53:32 +0000
From:	James Bottomley <jbottomley@...allels.com>
To:	Hannes Reinecke <hare@...e.de>
CC:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Jens Axboe <axboe@...nel.dk>,
	"ksummit-2013-discuss@...ts.linuxfoundation.org" 
	<ksummit-2013-discuss@...ts.linuxfoundation.org>,
	James Smart <James.Smart@...lex.Com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"kmo@...erainc.com" <kmo@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Tejun Heo <tj@...nel.org>, Christoph Hellwig <hch@....de>,
	"scameron@...rdog.cce.hp.com" <scameron@...rdog.cce.hp.com>
Subject: Re: [Ksummit-2013-discuss] [ATTEND] scsi-mq prototype discussion

On Fri, 2013-07-12 at 12:52 +0200, Hannes Reinecke wrote:
> On 07/12/2013 03:33 AM, Nicholas A. Bellinger wrote:
> > On Thu, 2013-07-11 at 18:02 -0700, Greg KH wrote:
> >> On Thu, Jul 11, 2013 at 05:23:32PM -0700, Nicholas A. Bellinger wrote:
> >>> Drilling down the work items ahead of a real mainline push is high on
> >>> priority list for discussion.
> >>>
> >>> The parties to be included in such a discussion are:
> >>>
> >>>   - Jens Axboe (blk-mq author)
> >>>   - James Bottomley (scsi maintainer)
> >>>   - Christoph Hellwig (scsi)
> >>>   - Martin Petersen (scsi)
> >>>   - Tejun Heo (block + libata)
> >>>   - Hannes Reinecke (scsi error recovery)
> >>>   - Kent Overstreet (block, per-cpu ida)
> >>>   - Stephen Cameron (scsi-over-pcie driver)
> >>>   - Andrew Vasquez (qla2xxx LLD)
> >>>   - James Smart (lpfc LLD)
> >>
> >> Isn't this something that should have been discussed at the storage
> >> mini-summit a few months ago?
> > 
> > The scsi-mq prototype, along with blk-mq (in it's current form) did not
> > exist a few short months ago.  ;)
> > 
> >>  It seems very specific to one subsystem to be a kernel summit topic,
> >> don't you think?
> > 
> > It's no more subsystem specific than half of the other proposals so far,
> > and given it's reach across multiple subsystems (block, scsi, target),
> > and the amount of off-list interest on the topic, I think it would make
> > a good candidate for discussion.
> > 
> And it'll open up new approaches which previously were dismissed,
> like re-implementing multipathing on top of scsi-mq, giving us the
> single scsi device like other UNIX systems.
> 
> Also I do think there's quite some synergy to be had, as with blk-mq
> we could nail each queue to a processor, which would eliminate the
> need for locking.
> Which could be useful for other subsystems, too.

Lets start with discussing this on the list, please, and then see where
we go from there ...

James

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