Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757643Ab3GLKwn (ORCPT ); Fri, 12 Jul 2013 06:52:43 -0400 Received: from cantor2.suse.de ([195.135.220.15]:55264 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757269Ab3GLKwl (ORCPT ); Fri, 12 Jul 2013 06:52:41 -0400 Message-ID: <51DFDFF5.80702@suse.de> Date: Fri, 12 Jul 2013 12:52:37 +0200 From: Hannes Reinecke User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7 MIME-Version: 1.0 To: "Nicholas A. Bellinger" Cc: Greg KH , ksummit-2013-discuss@lists.linuxfoundation.org, Jens Axboe , James Smart , linux-scsi , LKML , James Bottomley , Andrew Vasquez , kmo@daterainc.com, target-devel , Tejun Heo , Christoph Hellwig , scameron@beardog.cce.hp.com Subject: Re: [Ksummit-2013-discuss] [ATTEND] scsi-mq prototype discussion References: <1373588612.7397.447.camel@haakon3.risingtidesystems.com> <20130712010223.GA15673@kroah.com> <1373592815.7397.477.camel@haakon3.risingtidesystems.com> In-Reply-To: <1373592815.7397.477.camel@haakon3.risingtidesystems.com> X-Enigmail-Version: 1.6a1pre Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2167 Lines: 55 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. Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/