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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham 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 1847BC2B9F8 for ; Tue, 25 May 2021 18:06:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A1502610A8 for ; Tue, 25 May 2021 18:06:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232245AbhEYSIE (ORCPT ); Tue, 25 May 2021 14:08:04 -0400 Received: from aserp2130.oracle.com ([141.146.126.79]:39854 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232231AbhEYSIC (ORCPT ); Tue, 25 May 2021 14:08:02 -0400 Received: from pps.filterd (aserp2130.oracle.com [127.0.0.1]) by aserp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 14PI5ee1110747; Tue, 25 May 2021 18:06:29 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : content-transfer-encoding : content-type : mime-version; s=corp-2020-01-29; bh=fOauqFxTvnnDuWkdAM9Xn9ghBtvojat93NonAZx9odw=; b=Pi/ZmEzzDbiZ1JI5JbZH5BBd5ZE6Q7kLuG/+9WGQlxSMscVzhz8NZAQlA/XNM6joRHuS 8L4hzlVqR7TLveKQajl7wjXmDT0tHuoilRUYjDLNOriXDgjkqBT676EcSnJzNnDEo0s0 qGJlpuGJPeQ3QH3HgdTNsbYJEzYU+p7aqrqveEjes+23cjQB0zm16vO1q0yvxgwS9IIp 9S6BjVw84gjxPkwxX7MeTr9jk8I23SWw1bn/3LJLj56/IfkNC9aa/n1AeMYjgMmI1plf xYuT8mHPYvpwIPnz5nTxMAkXsNvVxug1bOmDULWgCEHUxN+a3hro5Qe97AskhVpcCV99 xg== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2130.oracle.com with ESMTP id 38pqfcexw0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 May 2021 18:06:28 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 14PI5GM4084737; Tue, 25 May 2021 18:06:28 GMT Received: from nam02-dm3-obe.outbound.protection.outlook.com (mail-dm3nam07lp2041.outbound.protection.outlook.com [104.47.56.41]) by userp3030.oracle.com with ESMTP id 38pq2ufcpc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 May 2021 18:06:27 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=QLtxSRXcPvWOlfdnVe7x3DIOa7HL/ryBcUd+vRD+6JZvWriN1KVehSy8r6n4rqAwOr2h2hN/mOE8FL1iEp9wkwJbybV2/0ychDk4K6RYE30o4Jm3OqkUw8uN7ZyYRMzdQbfVqaE9TMzfJ9PPyd3uT4UsjNkVzbuvX5UZPjamsv/9+QBM+9aQvlQM22uEPTjt6kW6sq3WTSvwJISqJI357t8xeJrVIt22SpbwhTWivdpky3LtC3meEnJaViiPubjwRAslaeyleVhDdSGqrC/j1XLcfKyijOSkMsLWK11mtsglYI16O5WdtbLmwUxV8AQwoKHpvqS9POhQbQGW7uifhg== 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=fOauqFxTvnnDuWkdAM9Xn9ghBtvojat93NonAZx9odw=; b=fXLpoRWi1qjeEA1b9Mt+1SihxwSCAE3Nx9tn3YcfaqalFJtPPuwbegusgUbquNApf2GnTGPfEZTwiT5Yk3k1xQB03olxM3CUxbZG53K8rj+kpsBQ5AM/WxDIRP6XLG4ckj8/TMJQGXNGkHQnjDBKPQvfBGGUNe3DbAkE/9I3TjKR3vajqXeNhnQTjSEQxzrFWpOFlLfVVlL/zU8zqO1eGAvlpTl/q31RQBBWTvP4RZDwj1jqQdOCZ3zsTU7uT0r2Y9JeLzwx/8XOONkdLMNcvQHTpcAlHBQ8h/YXfoVpXHhDj7Oe3YOjEbamrSDiKQK13/EgP3UPLRFG/pf4LYfq4A== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=fOauqFxTvnnDuWkdAM9Xn9ghBtvojat93NonAZx9odw=; b=QeYulF+hbWzszxyizJQvaHJjKft5X7Y0HZc1wjXlcDEbG1it8SqUWAvdr1elIOfM/3LTCAuSagrZO61qERx2av1F1M0PBusFykI4pwfdWwLYS4cB4arGZ3/y9NicKQeOm3tuZJh/dozSXckcsKIcQ3E7b2C7JgW+x9MC/t81vk0= Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=oracle.com; Received: from BYAPR10MB3573.namprd10.prod.outlook.com (2603:10b6:a03:11e::32) by SJ0PR10MB4639.namprd10.prod.outlook.com (2603:10b6:a03:2db::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4150.25; Tue, 25 May 2021 18:06:26 +0000 Received: from BYAPR10MB3573.namprd10.prod.outlook.com ([fe80::b09d:e36a:4258:d3d0]) by BYAPR10MB3573.namprd10.prod.outlook.com ([fe80::b09d:e36a:4258:d3d0%7]) with mapi id 15.20.4173.020; Tue, 25 May 2021 18:06:24 +0000 From: Mike Christie To: target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, stefanha@redhat.com, pbonzini@redhat.com, jasowang@redhat.com, mst@redhat.com, sgarzare@redhat.com, virtualization@lists.linux-foundation.org Cc: Mike Christie Subject: [PATCH 9/9] vhost: support sharing workers across devs Date: Tue, 25 May 2021 13:06:00 -0500 Message-Id: <20210525180600.6349-10-michael.christie@oracle.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210525180600.6349-1-michael.christie@oracle.com> References: <20210525180600.6349-1-michael.christie@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [73.88.28.6] X-ClientProxiedBy: DM6PR13CA0021.namprd13.prod.outlook.com (2603:10b6:5:bc::34) To BYAPR10MB3573.namprd10.prod.outlook.com (2603:10b6:a03:11e::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (73.88.28.6) by DM6PR13CA0021.namprd13.prod.outlook.com (2603:10b6:5:bc::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4173.12 via Frontend Transport; Tue, 25 May 2021 18:06:23 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3cd7630d-6ce2-4efc-e994-08d91fa7cf1d X-MS-TrafficTypeDiagnostic: SJ0PR10MB4639: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5516; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR10MB3573.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(39860400002)(396003)(376002)(366004)(136003)(346002)(36756003)(2616005)(83380400001)(4326008)(186003)(316002)(6512007)(6666004)(6486002)(1076003)(8676002)(16526019)(478600001)(2906002)(52116002)(66556008)(38350700002)(86362001)(66476007)(26005)(5660300002)(38100700002)(956004)(66946007)(8936002)(6506007)(107886003)(69590400013);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?uE11UUqXKVNHZyp7fxTSddCO30THPAklTVEYDbXKp1fRyfven2o+10inr6EY?= =?us-ascii?Q?FZArKPu/23yb+pQDXCxP1HipUe3MMH2mR11r1KPgNWcslHbOr+1Jd8KEG3/F?= =?us-ascii?Q?fngoF3G8Hanj1Rnc0SNU0UiOGh9/BoEY4G1kGVcPC/Jww0Slfm+4USxwqOGT?= =?us-ascii?Q?BSq7tmFDpUAN6RdHt8yQMqJHLToqE+sgFGI79iB+rzZ+RzjdsbTV9tK6huBd?= =?us-ascii?Q?4nEx6U68dlpoqwSQ4YWJcKePPGV4M36WfurSHrc1Luw9ypuQ3xn+0bdNcWgX?= =?us-ascii?Q?tsEv95KIJ7Kh5I8jwV4/0hyvljrNzhCxkLwMkz0FCH1nuGm14QCoSWW39fj9?= =?us-ascii?Q?F1xniXw2QQCpIINNwVvLdsgU2CTjX7ctifc8c8l4UwGYfj4PYrbiH7UaKKXB?= =?us-ascii?Q?TIGUAdt1j/oEWxqmXKOVdaBcsLaPItOUgXTI8amJQuadClReS73NbMYPYkKz?= =?us-ascii?Q?6teoZzQPTHYmxupep1ufRs7LLuCb9bng0IzKkPxgpFQ46PXXe6mNikdot6/Z?= =?us-ascii?Q?DoO1uIkF/iAFMLa0LjQ1H3InkS5cdiom8t7heg2EKiiHbmbhbuUA4/P7zf3n?= =?us-ascii?Q?Cxgtbsu8AS/uNlghuAbTXuVVU8/ky4TUGGxrrDMfvawvB3o6/HOp0JyV2ppg?= =?us-ascii?Q?dBiNC57irp2EiUBTR+ncQOwv7TYG7PhlpVqYa9cvfOjH/AhMyN0b0iXf+wGK?= =?us-ascii?Q?lvOKt4Fylf9jl2u3/X7CElT9dLvIU57xDy+/UHuLj/0J3rNFyInm1MxDQsEg?= =?us-ascii?Q?l3awWlPY4XY2/Iy7pndcYHTqw9XVp7erRKcP6cgs4dmG0+5o+850UevCZNRg?= =?us-ascii?Q?lmtPhLpjWTPHBRxEk7bST1841tsYWzzvb3exBy2w3wbj8pRY/gk7GmfToytq?= =?us-ascii?Q?NPJGD/w9LXr7V3hF/HX8s0p4gB4QOTeA/Ziof4lN3W4SvERwZyhp+b9MsDMD?= =?us-ascii?Q?jQBTeZ2gW6O2YqlEoZBM1KR5NIxuB5FQg3+y3Z8k0UeDzeboekzBiMMpAN1I?= =?us-ascii?Q?HQEC/xuSBzQOjjN0Xqml8CJZxIjJkxGLbXl10EeoZkH0+wwGpfCwfpVq9rDH?= =?us-ascii?Q?6WrnVMUETx0JGO0GKUShTv/mA+ezGwMXUSeaYZngpE6PCXt1b84bdPXNfYD8?= =?us-ascii?Q?f3zRtnoXfgY9GkUNo5nsB2Hsc5TNL2NCMx0wynYaw86Ye0SSXUgMrgDexf6P?= =?us-ascii?Q?5PAY4wNLQ3SAGiy40ST0PzwK45+RSCa8i7N81E3ALTgVvzxZ6eDB6WFN6mbC?= =?us-ascii?Q?+dFbKQBrixtiBJnJ/cS4R9Uc3LgUuERzpuBMSWIsuoH6MiheOZs4/j+IVEOL?= =?us-ascii?Q?QMNl6I5L6dAAyw9qXEg8Qnge?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3cd7630d-6ce2-4efc-e994-08d91fa7cf1d X-MS-Exchange-CrossTenant-AuthSource: BYAPR10MB3573.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2021 18:06:24.6348 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: CuKOjWUpTFJ3kRzkscYCoBGlJgccNVyD2ibf9JWxfwj93HPSG12HFkB0W4mrToNGPAToVKqiAvh9J7SXZJufDJlN76f3cVzvuHQGsuA9tCs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR10MB4639 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9995 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 malwarescore=0 spamscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105250111 X-Proofpoint-ORIG-GUID: Z6oNXHcwliieyGRFX3SY4ajHLBPo3uaD X-Proofpoint-GUID: Z6oNXHcwliieyGRFX3SY4ajHLBPo3uaD X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9995 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 spamscore=0 mlxscore=0 malwarescore=0 mlxlogscore=999 lowpriorityscore=0 impostorscore=0 adultscore=0 phishscore=0 priorityscore=1501 clxscore=1015 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105250111 Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org This allows a worker to handle multiple device's vqs. TODO: - The worker is attached to the cgroup of the device that created it. In this patch you can share workers with devices with different owners which could be in different cgroups. Do we want to restict sharing workers with devices that have the same owner (dev->mm value)? Signed-off-by: Mike Christie --- drivers/vhost/vhost.c | 16 +++++++--------- drivers/vhost/vhost.h | 1 - 2 files changed, 7 insertions(+), 10 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index eb16eb2bbee0..c32f72b1901c 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -388,12 +388,10 @@ static void vhost_vq_reset(struct vhost_dev *dev, static int vhost_worker(void *data) { struct vhost_worker *worker = data; - struct vhost_dev *dev = worker->dev; struct vhost_work *work, *work_next; + struct vhost_dev *dev; struct llist_node *node; - kthread_use_mm(dev->mm); - for (;;) { /* mb paired w/ kthread_stop */ set_current_state(TASK_INTERRUPTIBLE); @@ -412,15 +410,20 @@ static int vhost_worker(void *data) smp_wmb(); llist_for_each_entry_safe(work, work_next, node, node) { clear_bit(VHOST_WORK_QUEUED, &work->flags); + dev = work->dev; + + kthread_use_mm(dev->mm); + __set_current_state(TASK_RUNNING); kcov_remote_start_common(dev->kcov_handle); work->fn(work); kcov_remote_stop(); if (need_resched()) schedule(); + + kthread_unuse_mm(dev->mm); } } - kthread_unuse_mm(dev->mm); return 0; } @@ -667,7 +670,6 @@ static struct vhost_worker *vhost_worker_create(struct vhost_dev *dev) return NULL; worker->id = dev->num_workers; - worker->dev = dev; init_llist_head(&worker->work_list); INIT_HLIST_NODE(&worker->h_node); refcount_set(&worker->refcount, 1); @@ -702,10 +704,6 @@ static struct vhost_worker *vhost_worker_find(struct vhost_dev *dev, pid_t pid) spin_lock(&vhost_workers_lock); hash_for_each_possible(vhost_workers, worker, h_node, pid) { if (worker->task->pid == pid) { - /* tmp - next patch allows sharing across devs */ - if (worker->dev != dev) - break; - found_worker = worker; refcount_inc(&worker->refcount); break; diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 75ad3aa5adca..40c400172a84 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -32,7 +32,6 @@ struct vhost_worker { struct llist_head work_list; struct hlist_node h_node; refcount_t refcount; - struct vhost_dev *dev; int id; }; -- 2.25.1