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Thu, 22 Oct 2020 09:02:14 +0000 Received: from BYAPR11MB2632.namprd11.prod.outlook.com ([fe80::80e9:e002:eeff:4d05]) by BYAPR11MB2632.namprd11.prod.outlook.com ([fe80::80e9:e002:eeff:4d05%3]) with mapi id 15.20.3455.030; Thu, 22 Oct 2020 09:02:14 +0000 To: axboe@kernel.dk Cc: viro@zeniv.linux.org.uk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org From: "Zhang,Qiang" Subject: Question on io-wq Message-ID: <98c41fba-87fe-b08d-2c8c-da404f91ef31@windriver.com> Date: Thu, 22 Oct 2020 17:02:06 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [60.247.85.82] X-ClientProxiedBy: HK2PR04CA0043.apcprd04.prod.outlook.com (2603:1096:202:14::11) To BYAPR11MB2632.namprd11.prod.outlook.com (2603:10b6:a02:c4::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [128.224.162.183] (60.247.85.82) by HK2PR04CA0043.apcprd04.prod.outlook.com (2603:1096:202:14::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3499.18 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: windriver.com X-MS-Exchange-CrossTenant-Network-Message-Id: 60611272-6a28-4648-e1f3-08d876692b3d X-MS-Exchange-CrossTenant-AuthSource: BYAPR11MB2632.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Oct 2020 09:02:14.3823 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ddb2873-a1ad-4a18-ae4e-4644631433be X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: xC5uFoKdSRbCsJBnEGsxfyGVJ927Ty8RTIJFSzL4KKSYZ9LZsP/s+g2X7U1uy1VHfKMezpv9uTeluyfqh9TyySxIBsXMUf8oHm5UltHZALs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR11MB2678 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jens Axboe There are some problem in 'io_wqe_worker' thread, when the 'io_wqe_worker' be create and Setting the affinity of CPUs in NUMA nodes, due to CPU hotplug, When the last CPU going down, the 'io_wqe_worker' thread will run anywhere. when the CPU in the node goes online again, we should restore their cpu bindings? Thanks Qiang