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 X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16E57C4320A for ; Mon, 30 Aug 2021 12:02:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 01C4B60240 for ; Mon, 30 Aug 2021 12:02:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237293AbhH3MCu (ORCPT ); Mon, 30 Aug 2021 08:02:50 -0400 Received: from mail-mw2nam12on2047.outbound.protection.outlook.com ([40.107.244.47]:54529 "EHLO NAM12-MW2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S236821AbhH3MCM (ORCPT ); Mon, 30 Aug 2021 08:02:12 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=S7LeNls1hwjRGiX8NJkELmTCoBIKfZGEiCoe5Zeg+4bymJhn5LEIPzWwK4Pu97DgPyEMVPIy2kUW2t+yNuYjqAqhCG6JtVphF/Kr+yH/zWNtZsKXUkKH3BiMVLlzdW8xLUnQWHu1R9Ub9KALK3zlgzlAJdCkTgZzWyl4FZ/PxgY/KcrnIbJQxkHnCAR2EBMk5Cj1/78yJ/H+wtcE6GayHRl4J/nBH/XGtHyyVwYAxw/PjVeYnj4pvbyrcWub+GDXGM+5QNu973kTwZd3GyJM8e3cE2+4SE+kHVR4Sn+WOBMzPVm1/gHzB9QXwgOx2RItUu7EAScTnindC2Iy1ifd/A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=cy2cXRdTh3QnwcfkQsQzEouhmuGaV9pkDAc4lxKt4fo=; b=MWNkBlOTG9R0NDfwd2B/2hIUhPP2eN2H+cKIrP5S66lH26kWgqzjMxAocvwECbttFQNDF8hCQZgmxdUyoRPnM1Hn8T2zZ1OC0KppJ4Dm6Mi78Si5YkregqNLdKGkm2FNpR6NsIqBQptr9vb1Ik20SXIzWfGX6lH/Zj58DeNRYKeOnLWwLY+LMVC80hnSzwrSfevBGjP9IsAH6+x4KmLnhqepXh77yFs/qn+xUdOshcUd649Z6LBwzZKkMZkF1TJ3I3f71ShJI9X0O/0dg7SbMeIPLCkouDbI/N8CFbZJ74sw0JF7M+H7nqrohV3c+kWxgj9REd7DVGqrtmtNoADNXA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=temperror (sender ip is 216.228.112.32) smtp.rcpttodomain=redhat.com smtp.mailfrom=nvidia.com; dmarc=temperror action=none header.from=nvidia.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=cy2cXRdTh3QnwcfkQsQzEouhmuGaV9pkDAc4lxKt4fo=; b=hHFH0+1605hdVJweTFTGSYYsR93HnFamBLs8Zp5L1dcwBlhkIyLW0W9OdCrf909hRL6cmIkrTiDiz8ay3I6JCdG2p3xlOb9UFPOnHME0umqupo96aUpnKFZ5FE2U2yqdaQ1Ifg71JRGUJgCf5VDeVkkDqCk8Gt82dDPp/Wg9/EwjHOLX+0pBV8ZAbpVKiUErbQ86sWRVYXLLo5DVsPXjKrySDiMGnANmqBk913/K1ubV+K3lpzukfEaIluLunLLbnhiC35X+YeBd4UZyB0S1hGs+DjGCLSw8xRQQc1/5wiW+3coQm0LsAExvXRvrq6oMMP8V0ilWDeUw+OUiHE9HeA== Received: from BN9PR03CA0089.namprd03.prod.outlook.com (2603:10b6:408:fc::34) by CY4PR1201MB0183.namprd12.prod.outlook.com (2603:10b6:910:20::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4457.23; Mon, 30 Aug 2021 12:01:16 +0000 Received: from BN8NAM11FT068.eop-nam11.prod.protection.outlook.com (2603:10b6:408:fc:cafe::60) by BN9PR03CA0089.outlook.office365.com (2603:10b6:408:fc::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4457.17 via Frontend Transport; Mon, 30 Aug 2021 12:01:16 +0000 X-MS-Exchange-Authentication-Results: spf=temperror (sender IP is 216.228.112.32) smtp.mailfrom=nvidia.com; redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=temperror action=none header.from=nvidia.com; Received-SPF: TempError (protection.outlook.com: error in processing during lookup of nvidia.com: DNS Timeout) Received: from mail.nvidia.com (216.228.112.32) by BN8NAM11FT068.mail.protection.outlook.com (10.13.177.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.4457.17 via Frontend Transport; Mon, 30 Aug 2021 12:01:15 +0000 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 30 Aug 2021 05:00:25 -0700 Received: from r-arch-stor02.mtr.labs.mlnx (172.20.187.5) by mail.nvidia.com (172.20.187.12) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 30 Aug 2021 12:00:24 +0000 From: Max Gurtovoy To: , , , CC: , , , "Max Gurtovoy" Subject: [PATCH 1/1] virtio-blk: add num_io_queues module parameter Date: Mon, 30 Aug 2021 15:00:23 +0300 Message-ID: <20210830120023.22202-1-mgurtovoy@nvidia.com> X-Mailer: git-send-email 2.18.1 MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 50850952-ace1-4974-c4e7-08d96badde3e X-MS-TrafficTypeDiagnostic: CY4PR1201MB0183: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.32;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid01.nvidia.com;CAT:NONE;SFS:(4636009)(376002)(346002)(39860400002)(136003)(396003)(36840700001)(46966006)(36860700001)(107886003)(70206006)(47076005)(1076003)(26005)(82740400003)(86362001)(110136005)(356005)(83380400001)(70586007)(186003)(5660300002)(478600001)(36756003)(8676002)(316002)(7636003)(426003)(63350400001)(336012)(63370400001)(82310400003)(2906002)(2616005)(8936002)(54906003)(4326008);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Aug 2021 12:01:15.0226 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 50850952-ace1-4974-c4e7-08d96badde3e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.32];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT068.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR1201MB0183 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Sometimes a user would like to control the amount of IO queues to be created for a block device. For example, for limiting the memory footprint of virtio-blk devices. Signed-off-by: Max Gurtovoy --- drivers/block/virtio_blk.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index e574fbf5e6df..77e8468e8593 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -24,6 +24,28 @@ /* The maximum number of sg elements that fit into a virtqueue */ #define VIRTIO_BLK_MAX_SG_ELEMS 32768 +static int virtblk_queue_count_set(const char *val, + const struct kernel_param *kp) +{ + unsigned int n; + int ret; + + ret = kstrtouint(val, 10, &n); + if (ret != 0 || n > nr_cpu_ids) + return -EINVAL; + return param_set_uint(val, kp); +} + +static const struct kernel_param_ops queue_count_ops = { + .set = virtblk_queue_count_set, + .get = param_get_uint, +}; + +static unsigned int num_io_queues; +module_param_cb(num_io_queues, &queue_count_ops, &num_io_queues, 0644); +MODULE_PARM_DESC(num_io_queues, + "Number of IO virt queues to use for blk device."); + static int major; static DEFINE_IDA(vd_index_ida); @@ -501,7 +523,9 @@ static int init_vq(struct virtio_blk *vblk) if (err) num_vqs = 1; - num_vqs = min_t(unsigned int, nr_cpu_ids, num_vqs); + num_vqs = min_t(unsigned int, + min_not_zero(num_io_queues, nr_cpu_ids), + num_vqs); vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL); if (!vblk->vqs) -- 2.18.1