From patchwork Fri Nov 16 00:04:17 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikulas Patocka X-Patchwork-Id: 10685333 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1ECBB13B5 for ; Fri, 16 Nov 2018 00:36:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0DB042D411 for ; Fri, 16 Nov 2018 00:36:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 00BEB2D423; Fri, 16 Nov 2018 00:36:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 990182D411 for ; Fri, 16 Nov 2018 00:36:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726360AbeKPKqw (ORCPT ); Fri, 16 Nov 2018 05:46:52 -0500 Received: from 109-183-129-149.customers.tmcz.cz ([109.183.129.149]:46224 "EHLO leontynka.twibright.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725985AbeKPKqw (ORCPT ); Fri, 16 Nov 2018 05:46:52 -0500 Received: from debian.vm ([192.168.192.2]) by leontynka.twibright.com with smtp (Exim 4.89) (envelope-from ) id 1gNRdD-0001CU-6X; Fri, 16 Nov 2018 01:05:08 +0100 Received: by debian.vm (sSMTP sendmail emulation); Fri, 16 Nov 2018 01:05:06 +0100 Message-Id: <20181116000506.568964151@debian.vm> User-Agent: quilt/0.65 Date: Fri, 16 Nov 2018 01:04:17 +0100 From: Mikulas Patocka To: Mike Snitzer Cc: dm-devel@redhat.com, linux-block@vger.kernel.org, Jens Axboe , "Alasdair G. Kergon" , Christoph Hellwig , Mikulas Patocka Subject: [PATCH 1/3] dm: move dm_stats_account_io before generic_end_io_acct MIME-Version: 1.0 Content-Disposition: inline; filename=dm-stats-ordering.patch Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Make sure that the statistics are not updated while the device is suspended. So, we move statistics update before generic_end_io_acct. Signed-off-by: Mikulas Patocka --- drivers/md/dm.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) Index: linux-dm/drivers/md/dm.c =================================================================== --- linux-dm.orig/drivers/md/dm.c 2018-11-15 21:56:36.000000000 +0100 +++ linux-dm/drivers/md/dm.c 2018-11-15 21:56:36.000000000 +0100 @@ -674,6 +674,11 @@ static void end_io_acct(struct dm_io *io struct bio *bio = io->orig_bio; unsigned long duration = jiffies - io->start_time; + if (unlikely(dm_stats_used(&md->stats))) + dm_stats_account_io(&md->stats, bio_data_dir(bio), + bio->bi_iter.bi_sector, bio_sectors(bio), + true, duration, &io->stats_aux); + /* * make sure that atomic_dec in generic_end_io_acct is not reordered * with previous writes @@ -687,11 +692,6 @@ static void end_io_acct(struct dm_io *io */ smp_mb__after_atomic(); - if (unlikely(dm_stats_used(&md->stats))) - dm_stats_account_io(&md->stats, bio_data_dir(bio), - bio->bi_iter.bi_sector, bio_sectors(bio), - true, duration, &io->stats_aux); - /* nudge anyone waiting on suspend queue */ if (unlikely(waitqueue_active(&md->wait))) { if (!md_in_flight(md))