From patchwork Sat Mar 23 03:59:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 13600527 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C12363FE4; Sat, 23 Mar 2024 04:07:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711166846; cv=none; b=qRUYlitfKdeZ8f83VuYax9HRvgIaPrhxmdG8xAGEOqogpiCx5oyNQzVUk/sxjaAFGtJkhwXigU5VHOpkMFXsdvHLh7EBaieHVNibiiQQAeXYUpbKdbQqXqaHgrXesnV3m1cCr396ANac14J5wpfN9W/lmwvdLOJtFkGH/L3Qd5M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711166846; c=relaxed/simple; bh=wlNe565EX6ITZ9VJYXWbOT+/B5W320MRVmxqr+56sGA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nCXpim6R1FXvYN3Zx5UGwfeLFTgWxbvMz/aIvXbupGkdSe1zw5Wb8XebSLn6gNOBBrwPkAHuq+l42xWSl1+ib2pysmqq1Oa71tZOoCrCM50x3s5KW9zEyqbYlVMsutpVh9eWGzHjeqkbt5B1CBXociO8YGEIAcmbk6BAR9TLr1I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4V1lyX4db8z4f3jkn; Sat, 23 Mar 2024 12:07:16 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.112]) by mail.maildlp.com (Postfix) with ESMTP id 914721A0C11; Sat, 23 Mar 2024 12:07:20 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP1 (Coremail) with SMTP id cCh0CgAX5g51Vf5lhTs2Hw--.40826S6; Sat, 23 Mar 2024 12:07:20 +0800 (CST) From: Yu Kuai To: ming.lei@redhat.com, hch@lst.de, bvanassche@acm.org, axboe@kernel.dk, mpatocka@redhat.com, snitzer@redhat.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com Subject: [PATCH 2/2] block: remove blk_mq_in_flight() and blk_mq_in_flight_rw() Date: Sat, 23 Mar 2024 11:59:56 +0800 Message-Id: <20240323035959.1397382-3-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240323035959.1397382-1-yukuai1@huaweicloud.com> References: <20240323035959.1397382-1-yukuai1@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: cCh0CgAX5g51Vf5lhTs2Hw--.40826S6 X-Coremail-Antispam: 1UD129KBjvJXoWxJw45Kr4xWr43WF4DGw4fuFg_yoWrZw1kpF 43Ga9xArWjgr18Zr1Dta17XFy3Kws8K34xZwn3ArySyr1jkr13ZF10qrWkXrWSvrZ7AFW7 uwn0yFyDCF18G37anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBE14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jryl82xGYIkIc2 x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJw A2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq3wAS 0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2 IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0 Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2kIc2 xKxwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v2 6r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2 Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_ Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMI IF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUHbyAUUUUU = X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ From: Yu Kuai Now that blk-mq also use per_cpu counter to trace inflight as bio-based device, they can be replaced by part_in_flight() and part_in_flight_rw() directly. Noted that there will be a change that inflight will be accounted from blk_account_io_start() instead of blk_mq_start_request(). This also fix an inconsistence for rq-based device that if there are rq allocated but not started, io_ticks will be updated from blk_account_io_start() but not from part_stat_show() or diskstats_show(). For consequence, for example: blk_account_io_start -> 0s -> something is wrong with driver, rq can't be dispatched to driver -> finially the driver recovers blk_mq_start_request -> 10s Then in this case, if user is using "iostat 1", then user will found that 'util' is 0 from 0s-9s, because diskstats_show() doesn't update io_ticks, then in 9s-10s user will found 'util' is 1000%. Signed-off-by: Yu Kuai --- block/blk-mq.c | 32 -------------------------------- block/blk-mq.h | 5 ----- block/genhd.c | 18 +++--------------- 3 files changed, 3 insertions(+), 52 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 82045f0ab5ba..dfbb4e24f04a 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -87,38 +87,6 @@ struct mq_inflight { unsigned int inflight[2]; }; -static bool blk_mq_check_inflight(struct request *rq, void *priv) -{ - struct mq_inflight *mi = priv; - - if (rq->part && blk_do_io_stat(rq) && - (!mi->part->bd_partno || rq->part == mi->part) && - blk_mq_rq_state(rq) == MQ_RQ_IN_FLIGHT) - mi->inflight[rq_data_dir(rq)]++; - - return true; -} - -unsigned int blk_mq_in_flight(struct request_queue *q, - struct block_device *part) -{ - struct mq_inflight mi = { .part = part }; - - blk_mq_queue_tag_busy_iter(q, blk_mq_check_inflight, &mi); - - return mi.inflight[0] + mi.inflight[1]; -} - -void blk_mq_in_flight_rw(struct request_queue *q, struct block_device *part, - unsigned int inflight[2]) -{ - struct mq_inflight mi = { .part = part }; - - blk_mq_queue_tag_busy_iter(q, blk_mq_check_inflight, &mi); - inflight[0] = mi.inflight[0]; - inflight[1] = mi.inflight[1]; -} - void blk_freeze_queue_start(struct request_queue *q) { mutex_lock(&q->mq_freeze_lock); diff --git a/block/blk-mq.h b/block/blk-mq.h index f75a9ecfebde..aa92e1317f18 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -236,11 +236,6 @@ static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) return hctx->nr_ctx && hctx->tags; } -unsigned int blk_mq_in_flight(struct request_queue *q, - struct block_device *part); -void blk_mq_in_flight_rw(struct request_queue *q, struct block_device *part, - unsigned int inflight[2]); - static inline void blk_mq_put_dispatch_budget(struct request_queue *q, int budget_token) { diff --git a/block/genhd.c b/block/genhd.c index 782a42718965..9c64d34b7dc3 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -954,15 +954,10 @@ ssize_t part_stat_show(struct device *dev, struct device_attribute *attr, char *buf) { struct block_device *bdev = dev_to_bdev(dev); - struct request_queue *q = bdev_get_queue(bdev); struct disk_stats stat; unsigned int inflight; - if (queue_is_mq(q)) - inflight = blk_mq_in_flight(q, bdev); - else - inflight = part_in_flight(bdev); - + inflight = part_in_flight(bdev); if (inflight) { part_stat_lock(); update_io_ticks(bdev, jiffies, true); @@ -1003,13 +998,9 @@ ssize_t part_inflight_show(struct device *dev, struct device_attribute *attr, char *buf) { struct block_device *bdev = dev_to_bdev(dev); - struct request_queue *q = bdev_get_queue(bdev); unsigned int inflight[2]; - if (queue_is_mq(q)) - blk_mq_in_flight_rw(q, bdev, inflight); - else - part_in_flight_rw(bdev, inflight); + part_in_flight_rw(bdev, inflight); return sprintf(buf, "%8u %8u\n", inflight[0], inflight[1]); } @@ -1251,11 +1242,8 @@ static int diskstats_show(struct seq_file *seqf, void *v) xa_for_each(&gp->part_tbl, idx, hd) { if (bdev_is_partition(hd) && !bdev_nr_sectors(hd)) continue; - if (queue_is_mq(gp->queue)) - inflight = blk_mq_in_flight(gp->queue, hd); - else - inflight = part_in_flight(hd); + inflight = part_in_flight(hd); if (inflight) { part_stat_lock(); update_io_ticks(hd, jiffies, true);