From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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.lore.kernel.org (Postfix) with ESMTPS id C1F98D462B9 for ; Wed, 13 Nov 2024 15:21:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=t1k1en1ffmPqOLYLWn7gwg/fiy5HhmQhs9d2dWbdlh8=; b=VRwvKwraUE9SfhaAZywrm06vKU ePDy/0yPiRkKPgSnAU2hBAyo4Q08Scc5FPugzlX8Vt0sXUfU9uWbxAZczh8T1szay7Hg/Qyj3/gMp E5jmJhR/LUHqkUn0w66jogSGPNDi9f47rNdUjYVLPYiLP/Z/VvNaTlNOhyblDfZeuZfHzWrrnIxrM V1mR+W9wbUCM2IEC+GPd/LR8ROqlGC1qZ/iK2m2ProvGkCaIRzLma8ERawSGe6CJpO8QYOW5vr4dk vJ2wefwH9hO6Jg8Vf5mIy5uRQzwtHzjOziEM/qgtx3bdFTFRvq/gF2qfXsvTELF7cr1z+rdTAjIMF 2jNsZSIQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tBFB9-00000007HSi-0Q23; Wed, 13 Nov 2024 15:21:11 +0000 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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org 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); } -- 2.45.2