Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753863Ab1DRIeA (ORCPT ); Mon, 18 Apr 2011 04:34:00 -0400 Received: from cantor2.suse.de ([195.135.220.15]:35597 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753444Ab1DRIdy (ORCPT ); Mon, 18 Apr 2011 04:33:54 -0400 Date: Mon, 18 Apr 2011 18:33:43 +1000 From: NeilBrown To: Jens Axboe Cc: Mike Snitzer , "linux-kernel@vger.kernel.org" , "hch@infradead.org" , "dm-devel@redhat.com" , "linux-raid@vger.kernel.org" Subject: Re: [PATCH 05/10] block: remove per-queue plugging Message-ID: <20110418183343.036f412e@notabene.brown> In-Reply-To: <4DABF1EA.3070301@fusionio.com> References: <1295659049-2688-1-git-send-email-jaxboe@fusionio.com> <1295659049-2688-6-git-send-email-jaxboe@fusionio.com> <20110303221353.GA10366@redhat.com> <4D761E0D.8050200@fusionio.com> <20110308202100.GA31744@redhat.com> <4D76912C.9040705@fusionio.com> <20110308220526.GA393@redhat.com> <20110310005810.GA17911@redhat.com> <20110405130541.6c2b5f86@notabene.brown> <20110411145022.710c30e9@notabene.brown> <4DA2C7BE.6060804@fusionio.com> <20110411205928.13915719@notabene.brown> <4DA2E03A.2080607@fusionio.com> <20110411212635.7959de70@notabene.brown> <4DA2E7F0.9010904@fusionio.com> <20110411220505.1028816e@notabene.brown> <4DA2F00E.6010907@fusionio.com> <20110418081922.1651474a@notabene.brown> <4DABDC60.2090009@fusionio.com> <20110418172551.55629fc6@notabene.brown> <4DABF1EA.3070301@fusionio.com> X-Mailer: Claws Mail 3.7.8 (GTK+ 2.22.1; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2251 Lines: 64 [[NOTE to dm-devel people - one of the patches here remove some now-unused code from dm-raid.c plus a declaration from device-mapper.h ]]] On Mon, 18 Apr 2011 10:10:18 +0200 Jens Axboe wrote: > On 2011-04-18 09:25, NeilBrown wrote: > >>> Therefore md cannot put anything useful on the list in 'struct blk_plug'. > > > > That is the heart of the problem. > > Hmm, I don't really see a way to avoid the list in that case. You really > do need some way to queue items, a single callback or flag or pointer > will not suffice. > > I've added the patch and removed the (now) useless ->unplugged_fn > callback. I suggest you base your md changes on top of my for-linus > branch and tell me when you are confident it looks good, then I'll pull > in your MD changes and submit them later today. > > OK with you? > Yes, that's perfect. Thanks. All of my plugging-related patches are now in a 'for-jens' branch: The following changes since commit 99e22598e9a8e0a996d69c8c0f6b7027cb57720a: block: drop queue lock before calling __blk_run_queue() for kblockd punt (2011-04-18 09:59:55 +0200) are available in the git repository at: git://neil.brown.name/md for-jens NeilBrown (6): md: use new plugging interface for RAID IO. md/dm - remove remains of plug_fn callback. md - remove old plugging code. md: provide generic support for handling unplug callbacks. md: incorporate new plugging into raid5. md: fix up raid1/raid10 unplugging. drivers/md/dm-raid.c | 8 ---- drivers/md/md.c | 87 +++++++++++++++++++++------------------- drivers/md/md.h | 26 ++---------- drivers/md/raid1.c | 29 +++++++------- drivers/md/raid10.c | 27 ++++++------- drivers/md/raid5.c | 61 ++++++++++++---------------- drivers/md/raid5.h | 2 - include/linux/device-mapper.h | 1 - 8 files changed, 103 insertions(+), 138 deletions(-) Thanks, NeilBrown -- 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/