From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keith Busch Subject: Re: Question on handling managed IRQs when hotplugging CPUs Date: Tue, 5 Feb 2019 08:16:36 -0700 Message-ID: <20190205151632.GA28064@localhost.localdomain> References: <20190129172059.GC17132@localhost.localdomain> <3fe63dab-0791-f476-69c4-9866b70e8520@huawei.com> <86d5028d-44ab-3696-f7fe-828d7655faa9@huawei.com> <745609be-b215-dd2d-c31f-0bd84572f49f@suse.de> <42d149c5-0380-c357-8811-81015159ac04@huawei.com> <20190205145244.GB28023@localhost.localdomain> <0de6dae8-1234-3e3f-d8f3-2d8de47b7f9e@suse.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <0de6dae8-1234-3e3f-d8f3-2d8de47b7f9e@suse.com> Sender: linux-kernel-owner@vger.kernel.org To: Hannes Reinecke Cc: John Garry , Hannes Reinecke , Thomas Gleixner , Christoph Hellwig , Marc Zyngier , "axboe@kernel.dk" , Peter Zijlstra , Michael Ellerman , Linuxarm , "linux-kernel@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-block@vger.kernel.org" List-Id: linux-scsi@vger.kernel.org On Tue, Feb 05, 2019 at 04:10:47PM +0100, Hannes Reinecke wrote: > On 2/5/19 3:52 PM, Keith Busch wrote: > > Whichever layer dispatched the IO to a CPU specific context should > > be the one to wait for its completion. That should be blk-mq for most > > block drivers. > > > Indeed. > But we don't provide any mechanisms for that ATM, right? > > Maybe this would be a topic fit for LSF/MM? Right, there's nothing handling this now, and sounds like it'd be a good discussion to bring to the storage track.