From patchwork Wed Nov 13 15:20:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13873908 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 A84E715C14B; Wed, 13 Nov 2024 15:21:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731511273; cv=none; b=CX8e1X5w/2PIlBEKfCPtA/rpqlwZZA47bzpgggqBF3QlIPToaEAmUYE23FYOEdkc7I7RM12OBJPAUy6d36UCi2WgP3FZ4NIGGa0wZNf0RybKalLp5N8Eww/S/5HXoEITkAUDLLx4pvkx5U7QZlUIOpl36BoqNMjDVjyswdrIbYs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731511273; c=relaxed/simple; bh=XMmUlWjN0TLL6fcPi5a7olN02KBQ+xkgwNWYBquc5E8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=M2IWpRQK18PG2rvPQt3FzXDpHee6Cg7IMPyGXkVaBb1fzpC1q2jzs9p+Cbzd0jB0QQJ7f4DfExX/wfxjQUB+az1wRu10J2yj+FAH30PSehB4SKFObHbXmz4Q/93xGmBNdo1qKI7/2JV9Uet9TeNuYJpmRxmUzEK7BQg0BIDy6i4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=aBWUwBEq; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="aBWUwBEq" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=t1k1en1ffmPqOLYLWn7gwg/fiy5HhmQhs9d2dWbdlh8=; b=aBWUwBEq74rkudqhMFi4VyBoTk 6AK6zfcyClsIJMtQNk7kK/WULcpwHJC/7nkghja0IE/speYOAMYtq/U9nLUrWsaID96RrjxKAPGK/ qtnuM55IP3ZR+m43Ekd6gwP3ybS3DZfs0lpAoxZrmYffcHo/RiGvQYgNkCb8Es0tbq+2d6CFf7sE2 qviRGmbvARd86FGjSmClUZK4uzUNF04/fPoVOnSI6ZoD+7f4iV8Kpzc94j2QGikTOwALB76n/ibdg 4+mkgJ2bRCsmlk+NCjUOsSyuzVvT9sQuGBPw+3ypiGAuBhyrBpZIkRxnkvC7TDfB55r4IWrrdAq+B nyXJ5J/g==; Received: from 2a02-8389-2341-5b80-9e61-c6cf-2f07-a796.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:9e61:c6cf:2f07:a796] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tBFB6-00000007HPr-1ybM; Wed, 13 Nov 2024 15:21:09 +0000 From: Christoph Hellwig To: Jens Axboe Cc: "Michael S. Tsirkin" , Jason Wang , Keith Busch , Sagi Grimberg , Pavel Begunkov , linux-block@vger.kernel.org, virtualization@lists.linux.dev, linux-nvme@lists.infradead.org, io-uring@vger.kernel.org Subject: [PATCH 5/6] block: don't reorder requests in blk_add_rq_to_plug Date: Wed, 13 Nov 2024 16:20:45 +0100 Message-ID: <20241113152050.157179-6-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241113152050.157179-1-hch@lst.de> References: <20241113152050.157179-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Add requests to the tail of the list instead of the front so that they are queued up in submission order. Remove the re-reordering in blk_mq_dispatch_plug_list, virtio_queue_rqs and nvme_queue_rqs now that the list is ordered as expected. Signed-off-by: Christoph Hellwig --- block/blk-mq.c | 4 ++-- drivers/block/virtio_blk.c | 2 +- drivers/nvme/host/pci.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index ff0b819e35fc..270cfd9fc6b0 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1392,7 +1392,7 @@ static void blk_add_rq_to_plug(struct blk_plug *plug, struct request *rq) */ if (!plug->has_elevator && (rq->rq_flags & RQF_SCHED_TAGS)) plug->has_elevator = true; - rq_list_add_head(&plug->mq_list, rq); + rq_list_add_tail(&plug->mq_list, rq); plug->rq_count++; } @@ -2844,7 +2844,7 @@ static void blk_mq_dispatch_plug_list(struct blk_plug *plug, bool from_sched) rq_list_add_tail(&requeue_list, rq); continue; } - list_add(&rq->queuelist, &list); + list_add_tail(&rq->queuelist, &list); depth++; } while (!rq_list_empty(&plug->mq_list)); diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index a19f24c19140..c0cdba71f436 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -514,7 +514,7 @@ static void virtio_queue_rqs(struct rq_list *rqlist) vq = this_vq; if (virtblk_prep_rq_batch(req)) - rq_list_add_head(&submit_list, req); /* reverse order */ + rq_list_add_tail(&submit_list, req); else rq_list_add_tail(&requeue_list, req); } diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index c3a00a13946d..39ba1d0c287d 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -943,7 +943,7 @@ static void nvme_queue_rqs(struct rq_list *rqlist) nvmeq = req->mq_hctx->driver_data; if (nvme_prep_rq_batch(nvmeq, req)) - rq_list_add_head(&submit_list, req); /* reverse order */ + rq_list_add_tail(&submit_list, req); else rq_list_add_tail(&requeue_list, req); }