Received: by 2002:a05:6a10:f347:0:0:0:0 with SMTP id d7csp3011916pxu; Tue, 8 Dec 2020 00:45:57 -0800 (PST) X-Google-Smtp-Source: ABdhPJxmn4BBba5xEcbCbeY/PydiG09dr+GMU8QsxdTZQYiZT430IML7RFJ6YLyCx5467uSgR+fw X-Received: by 2002:a17:906:7c49:: with SMTP id g9mr17229653ejp.185.1607417157709; Tue, 08 Dec 2020 00:45:57 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1607417157; cv=pass; d=google.com; s=arc-20160816; b=X0hjxK5H+CgWBiMdQNOWdronWad4fhi06a1NBo352AiZcT9mxIz8mOsUcVGy8mn8Ah MkZfw/UNNywCF4Y5+WiKmDm7ZY5FU3dcQzmJKAmV3kbmL6KMDEz6tMhh/uSvWOoueCtM /lS8qpLV3Oc+0aDJh9O9sC7XtfyuzMFk01yvOBILoh33Uq/wIsT+x13sJjiAp4OoxIZW E9mCQFbUhZS3uKHrZFVgupiym/TQb4CZZzBaR94wUjnGltQ26lOe78sMiie0qsYnd7XT S+9q7uUKtbr366IlJNuAmsPp5sRiSFkjWQTdzbW61nc548n27NK2s33L+JFbBbtl80H8 aJaw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:content-transfer-encoding :wdcipoutbound:content-language:accept-language:references :message-id:date:thread-index:thread-topic:subject:cc:to:from :dkim-signature:ironport-sdr:dkim-signature; bh=vI+z36yDCv11VcUgqj0e33apteJLZMKEwiGqhlwp3d4=; b=watAXEC7nBpJfhNTNGa0QjT0gd4SWPMuC9fmTKJCYTNlzzuPWJPCjOKsonLAW6DkpJ JyMLCZoRdLkjfG3IMYcBtwmNMNDy1weETEtVuKTHHquc/VBSAcR/xkdQyHDExgWIORT2 BqubLRXLCFxslZqZRKwg78tW7OgesJmCHTtn/jd1pO3fysepNtO2vqvQtllnO5i9jeFg 88t+MlDorrzH3vKWfKx53k0cO2WgNUR2zGqSugY+HvJfvoMXt7A1BctqihU2UHgGoUoN rT4VB8purCaqtGy2f5XJkjyWYEC5dnv/nhUZI9HZ85riF6i2jv+IgBPY8R16kWVGmEnL gHiQ== ARC-Authentication-Results: i=2; mx.google.com; dkim=fail header.i=@wdc.com header.s=dkim.wdc.com header.b="p1JI4KS/"; dkim=pass header.i=@sharedspace.onmicrosoft.com header.s=selector2-sharedspace-onmicrosoft-com header.b=vwI+Xs0X; arc=pass (i=1 spf=pass spfdomain=wdc.com dkim=pass dkdomain=wdc.com dmarc=pass fromdomain=wdc.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=wdc.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id m8si9472136edp.82.2020.12.08.00.45.34; Tue, 08 Dec 2020 00:45:57 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=fail header.i=@wdc.com header.s=dkim.wdc.com header.b="p1JI4KS/"; dkim=pass header.i=@sharedspace.onmicrosoft.com header.s=selector2-sharedspace-onmicrosoft-com header.b=vwI+Xs0X; arc=pass (i=1 spf=pass spfdomain=wdc.com dkim=pass dkdomain=wdc.com dmarc=pass fromdomain=wdc.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=wdc.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728340AbgLHIlv (ORCPT + 99 others); Tue, 8 Dec 2020 03:41:51 -0500 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:54101 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726340AbgLHIlv (ORCPT ); Tue, 8 Dec 2020 03:41:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1607416911; x=1638952911; h=from:to:cc:subject:date:message-id:references: content-transfer-encoding:mime-version; bh=vI+z36yDCv11VcUgqj0e33apteJLZMKEwiGqhlwp3d4=; b=p1JI4KS/0BrYGWAfwVpsA7oKyZMe2LQmUjEFWyiDSP3eQwQ6MjVRi5ax XEfSrptDX6DEUs+3bXO2HK5Jw5nntsMWZk9GmtiYx565CcMdxROhGe7wj 5t8CVjdONt4DcnwmbchiqdeqD3Iw052xynW3GlmXU31GXLPuJKdYxMINB wEgvP4zEMv3Fg6JtCw/LfenML4BIMuPBdVenMWYkF832JjKPsaAljcWys Y0dSG+p66H8jXnABlmHAhya8uBvuiIj2BZbqsFxUgrgEvPY5wCxj+9Sha cHpKdASVWWnm48z1voPCcjOyJ9hYX7MDyl5o4N6ZxGcUq0EgOcWHEmP/1 g==; IronPort-SDR: tojNOJt2/GDmvfTULsY7Ex+RMhlRTsTML9USz2vIZiyw6YP0ug5Nj0LiYqSToLVdZnfbnlJ01C Zqq4GN+UDmAnj55Z252fju5xUXm31QJ2qlPJTCCAXNmtfLbbbpVz3umjXYMsDDMCX21IZu2sx+ xV12+JBmTtddJYCPBndQDKz5+3hLqCMfq6flxBC3gPh+XZjSBPR/Cjko3rXN/bQUTlhWKylA1E UA6ocLNWddRQ9DHKyDFFjlWK6/af/txty7pFPRtx+G0RAoLUxJYcyR+KcSWLcOaB6LgfqytMEh Sio= X-IronPort-AV: E=Sophos;i="5.78,402,1599494400"; d="scan'208";a="155882990" Received: from mail-co1nam11lp2175.outbound.protection.outlook.com (HELO NAM11-CO1-obe.outbound.protection.outlook.com) ([104.47.56.175]) by ob1.hgst.iphmx.com with ESMTP; 08 Dec 2020 16:40:44 +0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=oIpmGPbZkfv0LFBUZ+L5agt8KdZcqTglzH2XE0N+f7XhkiSOBQCoQFUX8Eof7dRITT6kBMTBjNhwWbHss5RwP58waKOv5Igg7xLSECI9rlN8bieRWnkWs0sYqBlKf/QKb5Wh5j9l7RXsmFe3TDl1rrDhArGs6s6ooDfsg7TzUkkiVFGXcjH4EtTX4Gv6Ll2sRv6xjB0f7zp1WDO+0G4hWxVI/n8kLJbWCZWBNdzg4gesAGrZ3uxO9lU2ifavyfjvAjTY6i300Be07uznbazjYqINm8sw2YA8hd/0C079oQrhVazFIyiMcXzONdzMB3zOHFNJatBwQtLpTQqGwr2NbQ== 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=vI+z36yDCv11VcUgqj0e33apteJLZMKEwiGqhlwp3d4=; b=Ri2NHO0lJxNZ5VAPTfAtfnnxZtdCvaqd+LYxdS8YKhs6/sopDKYUkDaPVxFba5+Z23RcziUN8RNK1HiuvJoeBv+tjnlgENtvW6Cx56M/f8cqqU/yelrOEjltBop8A6V7BBcA4sjsOaerNNU7PpAAxe/yBeM298R4rJpxo8e9uPmdnhFICRaHlOotaJMjNKglGjd9pJsdNCcUm+OtyI1g13sNI1gYKYgU58GSS9D3A5x3xIGlcp/TebXd/YIdVgd82MDYUrxiQ9OI0QSnD5j3WI2bOP1nkW3kU/Bw8NnjLnwJ9Bn30Z3kmz6OV0ipQjutIF7xYbT8mrDYTZm87YoU0g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=wdc.com; dmarc=pass action=none header.from=wdc.com; dkim=pass header.d=wdc.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sharedspace.onmicrosoft.com; s=selector2-sharedspace-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=vI+z36yDCv11VcUgqj0e33apteJLZMKEwiGqhlwp3d4=; b=vwI+Xs0XJNrdlcENIQgeTfcp9OVIL2BvQ+ocbW9adzycUNXwGL1tGv2h/fcX0q1S1Skn0mVvR0Mc4BUirwowUAEYYAoIfJqICqMgC18K2dPABEFmGCits2qMxbxOtP42Ly5bqgPVtA10CVmv2tiphnpi16tw9+CHq5ZJ0AK6LLU= Received: from SN4PR0401MB3598.namprd04.prod.outlook.com (2603:10b6:803:47::21) by SN6PR04MB4685.namprd04.prod.outlook.com (2603:10b6:805:b1::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3632.17; Tue, 8 Dec 2020 08:40:42 +0000 Received: from SN4PR0401MB3598.namprd04.prod.outlook.com ([fe80::65d7:592a:32d4:9f98]) by SN4PR0401MB3598.namprd04.prod.outlook.com ([fe80::65d7:592a:32d4:9f98%6]) with mapi id 15.20.3589.038; Tue, 8 Dec 2020 08:40:41 +0000 From: Johannes Thumshirn To: =?iso-8859-1?Q?Javier_Gonz=E1lez?= , Hannes Reinecke CC: Christoph Hellwig , SelvaKumar S , "linux-nvme@lists.infradead.org" , "kbusch@kernel.org" , "axboe@kernel.dk" , Damien Le Moal , "sagi@grimberg.me" , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "dm-devel@redhat.com" , "snitzer@redhat.com" , "selvajove@gmail.com" , "nj.shetty@samsung.com" , "joshi.k@samsung.com" , "Martin K. Petersen" , Bart Van Assche , Mikulas Patocka , "linux-scsi@vger.kernel.org" Subject: Re: [RFC PATCH v2 0/2] add simple copy support Thread-Topic: [RFC PATCH v2 0/2] add simple copy support Thread-Index: AQHWyi08xMuKL73ZZUaIarInYKlQvg== Date: Tue, 8 Dec 2020 08:40:41 +0000 Message-ID: References: <20201204094659.12732-1-selvakuma.s1@samsung.com> <20201207141123.GC31159@lst.de> <01fe46ac-16a5-d4db-f23d-07a03d3935f3@suse.de> <20201207192453.vc6clbdhz73hzs7l@mpHalley> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: javigon.com; dkim=none (message not signed) header.d=none;javigon.com; dmarc=none action=none header.from=wdc.com; x-originating-ip: [129.253.240.72] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: e6232f46-9985-4873-c699-08d89b54f26b x-ms-traffictypediagnostic: SN6PR04MB4685: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 3LGgpj+gCMajQIOvXv6NE2Yvr+S+Q1P66exy7VZIj3v+SYh7buoJLneeyRfyXroNOn0ztxHnYA8vEr1ClPe0qtqyKg6zwndfc7fjEDhnH5PcwJ2Vqkre7QfkGd3FGHs43tmOlH+vxomkrEBmAlw4l8bLR1bdhC1K1BFV57Zz9cd4VVmBrVrZ7qIhTzjCioerRdgJhT4e3hYc4Xty/+N4Rm5BwoE1ni6660ItRIEY+LUNwJ9Nf3ePK+ogGWv/2zjIQQMnWUUET4vtDfakzNClhKVEAsPsbzKF5t6xUPv4W9RNkeJ9x+Za/NUlL/tMius2IdEHBpVPdaxQcDgOFsVi7Q== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN4PR0401MB3598.namprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(39860400002)(396003)(346002)(376002)(136003)(8936002)(83380400001)(66446008)(66556008)(316002)(53546011)(2906002)(33656002)(76116006)(26005)(5660300002)(6506007)(91956017)(64756008)(4744005)(55016002)(86362001)(66946007)(52536014)(54906003)(186003)(7696005)(66476007)(110136005)(71200400001)(8676002)(478600001)(7416002)(9686003)(4326008);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: =?iso-8859-1?Q?zdk5Tt2WBtEqw48/dhHoSqKtOC7Mkap7mP7x02BhRb89x9Kz0r/A/dL+Hl?= =?iso-8859-1?Q?rMQJtq2xoyEAEAC3TH50VDGdKV68nYZgHE61YJmm2UwpotHzHfN2Wq3MLD?= =?iso-8859-1?Q?yMlanT8t0mNBPxLXulRU/JWfxISYV0/55ep+vEMLLskBC283HvHmw/QXxF?= =?iso-8859-1?Q?Ix6Q8BLzRZT4FH2KsXYdl547KhMIK/3PXYdayMBj/f6ZxY9EHdCIW38C3L?= =?iso-8859-1?Q?g1aH96mu9Y/l0ovlRxm9w4zSsGWSxdba8aNwwki7+njchhG0IbpyzbMPaf?= =?iso-8859-1?Q?Ayvegty6B08b3sCJwkGf2x5XgCsXpyegpyC476RKA2Z20V6Ck0W6aZNn4P?= =?iso-8859-1?Q?4rNGres69GcVpStqKpKeFziHwIJVSKL7ZLBPeyvezic/FKJsP0yXWUZM3Y?= =?iso-8859-1?Q?3M+E5vBO4FMgyRElazMRlcfYLHw/Os5FDDI6Thq6dAaguKL4aslRxGeiZd?= =?iso-8859-1?Q?c/5zNMd1Jg9Z6quL1+z6MbakacoBsBIosX9JJSANI2Gbe/pdyIU5VzkdEG?= =?iso-8859-1?Q?GyIth7tDCkEUMG62a7FKVD+ivUfYZ2NmdEo9B9ra2gFL7jeF1b5KanEw/Y?= =?iso-8859-1?Q?hXYMzUfdHIdFZjzeJhGZLwY730JhAP+mKFFiVHIFAmeiLlL1x9EIPCs0Qd?= =?iso-8859-1?Q?q+Uy38r8I8CyxPMi2AbWzGMjpE24lWeFScvSjE1pri5wMc8QmT+yCJyJb/?= =?iso-8859-1?Q?+EDO5md1Ra5bFA21pLUa9An45rfBkgzUWFeHftnS7VGTpx/Ye4VEHW/0vz?= =?iso-8859-1?Q?L0aS0WUfsS7kPq9ivP6hWjKRrAYD5Y/ez2lJx0pWMXe3ZFkoftJDAteUaG?= =?iso-8859-1?Q?/y/w02L7j9LfWvvEG3mBSeCdK3Co8sTCRpdo79HoK9BqS7UXsOqsIQ5I6B?= =?iso-8859-1?Q?diE8N0Uniq6A+RUKqWDTTEsl+rcOyeGEORBesZuv9fVXvRLfd/OhsgV806?= =?iso-8859-1?Q?xUdRZRc/aWJlPIWZdUpaRicDd30S6VPk9ydrqyTI7OSTn1JjPhCpa2E9W+?= =?iso-8859-1?Q?CAvpfN2l7wdsgkfWfyMxtFyoJfG6UsT3TTY60m?= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN4PR0401MB3598.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e6232f46-9985-4873-c699-08d89b54f26b X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Dec 2020 08:40:41.8083 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: G5f3SENs6K3SN1aPr2ineoVlrRSyV7/y9Og3cAswZBquhygTMpX45newZQyzpPDZnTOqJ4hXAboptAb7uqc4chBEDr7rMPngq6rkla6rsm8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR04MB4685 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/12/2020 20:27, Javier Gonz=E1lez wrote:=0A= > Good point. We can share some performance data on how Simple Copy scales= =0A= > in terms of bw / latency and the CPU usage. Do you have anything else in= =0A= > mind?=0A= > =0A= =0A= With an emulation in the kernel, we could make the usd "backend" =0A= implementation configurable. So if the emulation is faster, users can selec= t=0A= the emulation, if the device is faster then the device.=0A= =0A= Kind of what the crypto and raid code do as well.=0A= =0A= I'm really interested in this work, as BTRFS relocation/balance will have = =0A= potential benefits, but we need to get it right.=0A=