From patchwork Wed Mar 22 02:38:09 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: NeilBrown X-Patchwork-Id: 9638013 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D91D6602D6 for ; Wed, 22 Mar 2017 02:38:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CABFC281F9 for ; Wed, 22 Mar 2017 02:38:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BEDEF2833B; Wed, 22 Mar 2017 02:38:21 +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=-6.9 required=2.0 tests=BAYES_00,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 2A80C281F9 for ; Wed, 22 Mar 2017 02:38:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757425AbdCVCiV (ORCPT ); Tue, 21 Mar 2017 22:38:21 -0400 Received: from mx2.suse.de ([195.135.220.15]:34418 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758266AbdCVCiU (ORCPT ); Tue, 21 Mar 2017 22:38:20 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de X-Amavis-Alert: BAD HEADER SECTION, Header field occurs more than once: "Cc" occurs 3 times Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id EF160AAC7; Wed, 22 Mar 2017 02:38:17 +0000 (UTC) From: NeilBrown To: Jens Axboe Date: Wed, 22 Mar 2017 13:38:09 +1100 Cc: linux-block@vger.kernel.org, linux-raid@vger.kernel.org, dm-devel@redhat.com Subject: [PATCH] block: trace completion of all bios. cc: Alasdair Kergon , Mike Snitzer , Shaohua Li cc: linux-kernel@vger.kernel.org Message-ID: <877f3iave6.fsf@notabene.neil.brown.name> MIME-Version: 1.0 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 Currently only dm and md/raid5 bios trigger trace_block_bio_complete(). Now that we have bio_chain(), it is not possible, in general, for a driver to know when the bio is really complete. Only bio_endio() knows that. So move the trace_block_bio_complete() call to bio_endio(). Now trace_block_bio_complete() pairs with trace_block_bio_queue(). Any bio for which a 'queue' event is traced, will subsequently generate a 'complete' event. Signed-off-by: NeilBrown --- block/bio.c | 3 +++ drivers/md/dm.c | 1 - drivers/md/raid5.c | 8 -------- 3 files changed, 3 insertions(+), 9 deletions(-) diff --git a/block/bio.c b/block/bio.c index 5eec5e08417f..c89d83b3ca32 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1838,6 +1838,9 @@ void bio_endio(struct bio *bio) goto again; } + if (bio->bi_bdev) + trace_block_bio_complete(bdev_get_queue(bio->bi_bdev), + bio, bio->bi_error); if (bio->bi_end_io) bio->bi_end_io(bio); } diff --git a/drivers/md/dm.c b/drivers/md/dm.c index f4ffd1eb8f44..f5f09ace690a 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -810,7 +810,6 @@ static void dec_pending(struct dm_io *io, int error) queue_io(md, bio); } else { /* done with normal IO or empty flush */ - trace_block_bio_complete(md->queue, bio, io_error); bio->bi_error = io_error; bio_endio(bio); } diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 9a3b7da34137..f684cb566721 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5141,8 +5141,6 @@ static void raid5_align_endio(struct bio *bi) rdev_dec_pending(rdev, conf->mddev); if (!error) { - trace_block_bio_complete(bdev_get_queue(raid_bi->bi_bdev), - raid_bi, 0); bio_endio(raid_bi); if (atomic_dec_and_test(&conf->active_aligned_reads)) wake_up(&conf->wait_for_quiescent); @@ -5727,10 +5725,6 @@ static void raid5_make_request(struct mddev *mddev, struct bio * bi) md_write_end(mddev); remaining = raid5_dec_bi_active_stripes(bi); if (remaining == 0) { - - - trace_block_bio_complete(bdev_get_queue(bi->bi_bdev), - bi, 0); bio_endio(bi); } } @@ -6138,8 +6132,6 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio) } remaining = raid5_dec_bi_active_stripes(raid_bio); if (remaining == 0) { - trace_block_bio_complete(bdev_get_queue(raid_bio->bi_bdev), - raid_bio, 0); bio_endio(raid_bio); } if (atomic_dec_and_test(&conf->active_aligned_reads))