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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38A57C433F5 for ; Tue, 14 Dec 2021 00:43:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242755AbhLNAnf (ORCPT ); Mon, 13 Dec 2021 19:43:35 -0500 Received: from mail-dm6nam08lp2044.outbound.protection.outlook.com ([104.47.73.44]:20239 "EHLO NAM04-DM6-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S233802AbhLNAne (ORCPT ); Mon, 13 Dec 2021 19:43:34 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Ci5NbB4zwaCXF9hi6xEbOynQlarxo4PO1hGYo2PRS+rnxuH6F7+yHtmx+aLmYmWjC89L4fxmwXVapOJ3tc35mUOvBeuo0TjurGNVOOalZEehecGRmCQtQK88dH+w9sJzQcHbI+3AWNXxVeUUC18YnCwZ5vHkKbC4MRwxoqSQncgMSVynU1WAaCt0Myrd1Zloc74YdD/GRS/VFshZXqSW5cbJUvphL66pbbLWiFbhE2Eo/JgiRXNBiEvvswhhh+wo068f+eD+EmYqTvjkXoptaq/AW+BVfxtN9BTgF3Qc5UEAhgQvQwrxQ7Alu+TTfFWgBFNQDu6e6/LA+n0qOtp0+Q== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=uABErC4HXs+33tggESVbDAz2UZBQ8zALdrQN4ClpxII=; b=MsgL37ihlxEFpiiBTQ7WXL+TMLNrjlaacbufMAZ67WHVQjo2qGgwEi2yFyQC448IfUJSnrdjHEOfSws+Q+H7PvsiBPOxjryTeMnvRMtwqrZwyKb7o5XTMfpNz9AL6TYKTekxWWJ2SRLrLqH6UqjpSbpclfdvAJ7b8CJ/lzGvOwzTvgDdbC7U5+KrfUitoFe3LVO97LPgtT4DjXIj9ZKKiC9vZ8tD2digHJPmeGVovpn+zppYtaozimixoKyFWdaRd8RPmFUKbqNMSktyUu3HaxPT5GLAIvbdHw0NN/Zp3AAv/vdJHPLCaQuBhiEM4wPVXurDZszIeSYsZtxc+m2lqw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=microsoft.com; dmarc=pass action=none header.from=microsoft.com; dkim=pass header.d=microsoft.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=uABErC4HXs+33tggESVbDAz2UZBQ8zALdrQN4ClpxII=; b=Po9kJwYPhyDSNce9IzUhyr/j3iDy2/sMQsmrdUfCInNOPv1aF8uM84/wnc7BGYmMpbam/7s1lJPH4sMvkpsSrua5833UhDc64N025DM8N4Mb0C8lFkgscIGWhNXdsBX3zqlGjGFFmnx+REHQE7N4z5netv+8J5evtXImMNF1ij0= Received: from BYAPR21MB1270.namprd21.prod.outlook.com (2603:10b6:a03:105::15) by BY5PR21MB1507.namprd21.prod.outlook.com (2603:10b6:a03:231::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4713.0; Tue, 14 Dec 2021 00:43:30 +0000 Received: from BYAPR21MB1270.namprd21.prod.outlook.com ([fe80::9904:180b:e610:fd83]) by BYAPR21MB1270.namprd21.prod.outlook.com ([fe80::9904:180b:e610:fd83%4]) with mapi id 15.20.4755.004; Tue, 14 Dec 2021 00:43:30 +0000 From: Dexuan Cui To: Jens Axboe , "'ming.lei@redhat.com'" , 'Christoph Hellwig' , "'linux-block@vger.kernel.org'" CC: Long Li , "Michael Kelley (LINUX)" , "'linux-kernel@vger.kernel.org'" Subject: RE: Random high CPU utilization in blk-mq with the none scheduler Thread-Topic: Random high CPU utilization in blk-mq with the none scheduler Thread-Index: AdftWjJCThl7/4e5TledNcioslhEuwA0I/TAAAIttYAAAhJ/YAAAZxqAAABQgvAAB2fUwAAPiK6AAAmHiRAAZDAcAAAMK9PQ Date: Tue, 14 Dec 2021 00:43:30 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ActionId=f669c99e-cae9-4fc2-8d7b-3983807292e6;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ContentBits=0;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=true;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Method=Standard;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Name=Internal;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SetDate=2021-12-14T00:31:31Z;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microsoft.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: cfc45dd9-365c-4d84-823a-08d9be9abff3 x-ms-traffictypediagnostic: BY5PR21MB1507:EE_ x-ld-processed: 72f988bf-86f1-41af-91ab-2d7cd011db47,ExtAddr 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:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR21MB1270.namprd21.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(82950400001)(82960400001)(33656002)(5660300002)(66556008)(9686003)(8990500004)(38100700002)(66476007)(71200400001)(4326008)(508600001)(52536014)(316002)(122000001)(66446008)(7696005)(64756008)(55016003)(110136005)(10290500003)(26005)(186003)(86362001)(38070700005)(6506007)(8936002)(66946007)(8676002)(54906003)(76116006)(83380400001)(2906002)(491001)(20210929001);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?utf-8?B?RG03RjFCaDI2eEFnYUkxWXFqcjBGT3ZPMVVMMFVLTmRsMXFOQ1k3clh6eVl5?= =?utf-8?B?TlNiV3BUZm1hTk42bWpaL3lnY2Vrc3l4Q2lVS0QrUHBVMlpTNTRXRXM1M0tW?= =?utf-8?B?WElzZllBMlRDVmR4bDF2VDIwaGNLU0pMTWlOZUJBRTJvWVh1czlqbExQenM2?= =?utf-8?B?Zkd2L3dRVUgxUVl5ZDJPb1JRNXpiYTY3MmxLYVNkcVdEdDg4K25ydFo4OU1L?= =?utf-8?B?N1B3OEY5L2lqdzIzajM4UmI3NjJCOFYzZEx1ZXNmdHhta3MwVzlrQm90SWhQ?= =?utf-8?B?VEE1bVRoOGJJckN5SjhxZnBRam1aOE9VTitpMGFLbTNlYTloODErMDJFL3Zk?= =?utf-8?B?Wk5pdndNTjdBN0pRZ2JIZjV0UlQzSDUzdFVQbEJGRHhiWUROWnVhQ2RjN1p5?= =?utf-8?B?eWtyVXNUM05SNWltNUMzcEpXeTJ1cklHZmJ2WTJKcGdKekVtc2xybVlmNTJz?= =?utf-8?B?Rm1KdFZFMDFIWitZSFlpd3djQThaM2VWWVVTc1hPakZRb09ENmtSR3Q3RmZv?= =?utf-8?B?cWl3YlZqSml5YlE3ejZHMGN4ZytYZnlSR1R4c2JoS3VONll6WEljcDZ2UnQw?= =?utf-8?B?S25WUm90azgrZFhWd0RwekNaZW5KendFSHJEcnhpTTZMVG9lRVVTRnJnZ2Nh?= =?utf-8?B?VGJsQnVjQ2w5b1JGSHdBU2pSbFdyWVpBL2V0MGgzM09YUmNSSWVCWm9zWlI3?= =?utf-8?B?SnVhMVJ0TGVkdzgvWEtnaW5qdktKTFhHOHYzVllYdFdXUWx0aEVtZFR4RHJp?= =?utf-8?B?U2M0WDc5cURwL1ljMm52UnU4Qnh6d280dnpOMDRFb0FrejBxOW5HbFJ0Q3Nz?= =?utf-8?B?NzJqV0QvZmFROTk1eDZFSVVSSnVXOGFabUcxaloxbTI0Qko5Q09OREVNMW0r?= =?utf-8?B?d2tNUHNvSWJXd3ArMmNuVEZoSUpOMWpHOW1OQzlJY3dlSEF3MkoxbTUwMzZM?= =?utf-8?B?K1YrUzNuKzJFSC9pMUNHUEJTclZPWTJpVXJnY1VtbFpiQjBxNUF6QUNrNXhJ?= =?utf-8?B?ZE9MMVRXa1BibjU5Wk0yVzNFMDVqU2lMZHFVbmh4QmExOTlDWHdGdUNkTGps?= =?utf-8?B?ZEVIc2VLblpDaTNwb280NUY5QU56eldqd3Y5cVVRN29DS2xKUXBhWHpGSHRt?= =?utf-8?B?dDFqYTJjckFhYks0ekdiczdUSlFxVFU2eWkxT1BxZmxZTkIwSnVMOGhPd3hD?= =?utf-8?B?TzMrN2pKUnhMRGtJZyt3MG5hUkFjS1c2SlJ4OGZwUEZ6b2hkSDE2SjdjWTFO?= =?utf-8?B?cktGQzFUaEZZTTJOdFhhWXUwY3JXRXB3a1REQ1dZSEt4am9aRHV3ZTc0Qk42?= =?utf-8?B?bVpCbmY5U2VFSTNrdWh1cTl1dk8zSGpoVEVvdDgyT1VERHRRVHNWYlAvUmVQ?= =?utf-8?B?Q2J4eTFadDdVYW92OUk3QlgxVjh4T1k3R1Fnc0owcDdxcWdCVnlOaWp0NnZl?= =?utf-8?B?SEdScWJ4TThRTUJEa0VtNUF5ZHdGT3cvQnJaOFQ1TzFmczFhc2Y5d3M3dGcv?= =?utf-8?B?Zll5UDJkd2pwVkloRzJRWmxHUElpWmtydHRYVVVmOG00Y2tpWjRiWUtnR2E1?= =?utf-8?B?WCtTODBqWHZDY1BuSzYweW1nZ2ZWL2E1YU1MUkwwRm9mbnBWRCtXMm9ZTEpa?= =?utf-8?B?NjVOY0JJOWt6SzRDa3pzT3hvc1diR0JwUWphdGpwa0QremVzRW56QkhER0pp?= =?utf-8?B?YlZ4ZldocENnbjdOR1h5YnVDeEYzVDhleUpZLzZobFQ4bzZvZ09PZDhmcTBt?= =?utf-8?B?OURqdkt2amVuR1k3dm5NQkxFWTBTZmJSem82VlBmbHFQY3FGTkFrYXNRVDAr?= =?utf-8?B?MDJwUjlxWllza1labzhzOUJ2T1Y4cDN2aG05SEtMcm9SaDdCVkxZRkRPczFY?= =?utf-8?B?NVNZNHpoZHcxT1B4djM4UXdvR252Y2ptYWJEZWhteFViMktPUVZhZEI0bFNz?= =?utf-8?B?YS9kMTZGK2UxS3gvZGUvV25lbGo3UEJrRHU3c1FXVWZVeEFWV2RxaDkrR3NW?= =?utf-8?B?OWZTdUU4TnFyQ2VZdVl1YUVmTWFRWGZZTkxqWjVYTHUxdHRhcWJVTW9MZ2k3?= =?utf-8?B?QWRoL0xCY2piT01pQkxCeXMzdkoyUnQwNnRDQ1N5cG5PT1RoY1U5NGpNaDFB?= =?utf-8?B?MFdJcFNKdStQRnRoNHlHaVY1RUJiOSs0T2FuQzgyQ0svREh3elBXcGN3YVZk?= =?utf-8?Q?9eehS8XTagVuZP2J9yRBgtY=3D?= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR21MB1270.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: cfc45dd9-365c-4d84-823a-08d9be9abff3 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Dec 2021 00:43:30.2283 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: F/qgVjJ+4tXHs3Q4Ix3GooFyonG+LymjWZqhrN5XVTuIovurH7mbstQEJyU/UpW8tAtrDtIbJmrgZlVW3n8LQQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR21MB1507 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogSmVucyBBeGJvZSA8YXhib2VAa2VybmVsLmRrPg0KPiBTZW50OiBNb25kYXksIERlY2Vt YmVyIDEzLCAyMDIxIDEwOjQzIEFNDQo+IA0KPiBJIHdvbmRlciBpZiB0aGlzIHdpbGwgaGVscCwg U0NTSSBhcnRpZmFjdCBtYWtpbmcgdXMgaGl0IHRoZQ0KPiBtb2QgZGVsYXllZCB3b3JrIHBhdGgg YWxsIHRoZSB0aW1lLiANCg0KWWVzLCBJIHRoaW5rIHRoaXMgaXMgd2hhdCdzIGhhcHBlbmluZyBo ZXJlLg0KDQo+IE1pZ2h0IGJlIGEgcmFjZSBpbiB0aGVyZSwgYnV0IHNob3VsZCBiZSBmaW5lIGZv ciB0ZXN0aW5nLg0KPiANCj4gDQo+IGRpZmYgLS1naXQgYS9ibG9jay9ibGstY29yZS5jIGIvYmxv Y2svYmxrLWNvcmUuYw0KPiBpbmRleCA0ZDhmNWZlOTE1ODguLmNiMmY0ZDYwNGJhZCAxMDA2NDQN Cj4gLS0tIGEvYmxvY2svYmxrLWNvcmUuYw0KPiArKysgYi9ibG9jay9ibGstY29yZS5jDQo+IEBA IC0xNjI1LDcgKzE2MjUsOSBAQCBFWFBPUlRfU1lNQk9MKGtibG9ja2Rfc2NoZWR1bGVfd29yayk7 DQo+ICBpbnQga2Jsb2NrZF9tb2RfZGVsYXllZF93b3JrX29uKGludCBjcHUsIHN0cnVjdCBkZWxh eWVkX3dvcmsgKmR3b3JrLA0KPiAgCQkJCXVuc2lnbmVkIGxvbmcgZGVsYXkpDQo+ICB7DQo+IC0J cmV0dXJuIG1vZF9kZWxheWVkX3dvcmtfb24oY3B1LCBrYmxvY2tkX3dvcmtxdWV1ZSwgZHdvcmss IGRlbGF5KTsNCj4gKwlpZiAoIXdvcmtfcGVuZGluZygmZHdvcmstPndvcmspKQ0KPiArCQlyZXR1 cm4gbW9kX2RlbGF5ZWRfd29ya19vbihjcHUsIGtibG9ja2Rfd29ya3F1ZXVlLCBkd29yaywNCj4g ZGVsYXkpOw0KPiArCXJldHVybiB0cnVlOw0KPiAgfQ0KPiAgRVhQT1JUX1NZTUJPTChrYmxvY2tk X21vZF9kZWxheWVkX3dvcmtfb24pOw0KPiAtLQ0KPiBKZW5zIEF4Ym9lDQoNClRoYW5rcyB2ZXJ5 IG11Y2ghIFRoaXMgcGF0aCB3b3JrcyENCg0KSW4gdGhlIHRlc3QsICJ2NS4xNi1yYzQgKyByZXZl cnRpbmcgZGM1ZmMzNjFkODkxIA0KKCJibG9jazogYXR0ZW1wdCBkaXJlY3QgaXNzdWUgb2YgcGx1 ZyBsaXN0IikgKyB0aGlzIHBhdGNoIiBzaG93cyBhIGdvb2QgSS9PDQpwZXJmb3JtYW5jZSB0aGF0 J3MgYWJvdXQgdGhlIHNhbWUgYXMgdjUuMTYtcmM0Lg0KDQpJIHN1cHBvc2UgInY1LjE2LXJjNCAr IHRoaXMgcGF0Y2giIHdvdWxkIHNob3cgYSBzbGlnaHRseSBldmVuIGJldHRlcg0KcGVyZm9ybWFu Y2UuDQoNCkl0IHdvdWxkIGJlIGdyZWF0IGlmIHlvdSBjYW4gY29tbWl0IHRoaXMgc21hbGwgcGF0 Y2ggc28gdGhhdCBpdCBjYW4gYmUNCmJhY2twb3J0ZWQgdG8gb2xkIHN0YWJsZSBrZXJuZWxzLg0K DQpUaGFua3MsDQpEZXh1YW4NCg==