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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 EBD65C34047 for ; Wed, 19 Feb 2020 15:49:59 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B982B2465D for ; Wed, 19 Feb 2020 15:49:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="eJnFoiDh"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="lc+ctfAf"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=sharedspace.onmicrosoft.com header.i=@sharedspace.onmicrosoft.com header.b="qlUOF+1A" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B982B2465D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=wdc.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:Message-ID:Date :Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Owner; bh=N4cjRscO0BXfCXRifQZ9aPEg3LxVtkNh6kZjH1vXNRI=; b=eJnFoiDhAsYXeo w6l2rKHRBegHGDbJDknx2y6kkusFbNDX1wr/F47xLBZV6NCq1Qz1j+uSt5kqjw6OSq//VYyxZP1Q+ L6vytTzXwaW9jKEbCZaBHufZ2iSIRRwUbXXfszcwDW8v+8JTzE1/frDWwyQy7N3QXq3BNynV2p+R8 jpQjwiLB03ChTP2ooCXZSs/OftKnE+6E/O0QVKAeBci3XkvmRADkGKCrXI7vCqWmQbBMabNgEKhc0 bdTh9ZFJjvTwc/J+pRgDZw6dJBY/VZ1w86TZjy9cRTiNse8o7yrrzEZKh/P7xvRrjYuFqehocTGbL 6bg5WHklHvY9sKSTqk5Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j4Rbp-0002LD-Sd; Wed, 19 Feb 2020 15:49:57 +0000 Received: from esa4.hgst.iphmx.com ([216.71.154.42]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1j4Rbn-0002Ke-QW for linux-nvme@lists.infradead.org; Wed, 19 Feb 2020 15:49:57 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1582127395; x=1613663395; h=from:to:cc:subject:date:message-id:references: content-transfer-encoding:mime-version; bh=4oXBXlz1PXhUrT/gIqbcF3JJEAWDQ0MIGQikaAT7xn4=; b=lc+ctfAfjiGZe+2BszPjIR0lgRSN8MKFvW4INBg9OFibEFI1QUAeWsaE x2j6Vf0oJc70egzyEvY7bhvboxhmg3HYjXCHBVwGJmexA+r1qAD7YIRZ+ cVeJD5w5E464hJ8+/oYOS388V2/l5I3KgPd/GCaaReB5cFuOQ9Y7p+D/+ AhobNxlz3CclcUrnqjczr5JP9vMgv+Tg5zUgcJKN3RwgIpJT3gC2K72gT oYYmjm+VO6YglUwicHCGOy3ZDErxIDSl41j+uUTtkBDvzRY/fdAXkLFdC BLrBAiEKqUTGYyT2GQKgLOUpNM8J0AR6B4a+Vg1JfMjMvmis0HAj9NYYQ Q==; IronPort-SDR: ZwFZ7fdbg8xlCnJIBA8sM/5MOJ9DtUGCKDeMK+Eb9VvGm3j9FziH73TqIxqtYcIRfc8TiYxCa0 Gm5bfX5SCoXNbzkP8kYc2355UItbLBWwzBQp0ivIgTPu65ZesqVxfguPAqXQSbmCvn40gTFbFb 7uQc/NEyvRRTOxCUXg9l238Qg3CX0kJknN+2yqEq3nLsm3yzDnK3XWjsSDUv04frWIEVf25qcE SquAGgYYB+J8JRKFv7IVHEJbKuOp/JpHTejhzTNtVsAt215dlmPhfQEHvl7s4jbe5dvtuGdkEF 60k= X-IronPort-AV: E=Sophos;i="5.70,461,1574092800"; d="scan'208";a="130183925" Received: from mail-dm6nam12lp2173.outbound.protection.outlook.com (HELO NAM12-DM6-obe.outbound.protection.outlook.com) ([104.47.59.173]) by ob1.hgst.iphmx.com with ESMTP; 19 Feb 2020 23:49:48 +0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=GDFQ1hE7M/6FDZ3zP5PVSy9vF5YAbe5CH/wFOfE70q5lA3c9pDJ7GbwxhLfAB0kojbmY0dwuug+wrBhP0S4zUflSpdAfaOAg46Qag9iCDsOAjS7mAk60O7J+zIwe9ZmhUu8kqu84W1PFDumwp5ewMzRYQpICYqUEql2TC/AT3S4tVy6lApHqSLpTFe2FhdjgdR/BHlGaV+9E6czL8zCMpDymVoQcVGR06ZTPkYiG7RlaoGFTRF4S9uD4eIVc8SEmw25H1f58SmjskOBQQksxXs4tYHXYZlLXeBCayXZoO/FR+xv0rztI+aHgPiqq1T09UXLOCq46HwA6VLdOhJPoAA== 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=4oXBXlz1PXhUrT/gIqbcF3JJEAWDQ0MIGQikaAT7xn4=; b=kkwEXJOR19slDOX5thoP9AB8lPsi3Rp8ZL1vceUI/+FshxRORP3Hyw7wL1dLB/zQa/hCQTAHUP6RHTwi0FM/pIaz4QNz7Q1PpaCThxfPoCPFbSE+fJCEXMpD8yg7fjYx4zAmMNIStPrazR0bTSTftWkKCiEBx2Sv0l9Um+VrXZ7FZawcSno/KE3011mT7r3BmKhiC4oXwx8vjjNiCrUFkIKzCzwE3Od3Y4RjAEPr2ACZURX6BcNdAOAXslR6xawrj+EgYHXyYUfc+nCkNtvjjLoZJ0TpLeZgaU2XhlKv/CW8aCR0xSAb7xdrnrvciUoWHuj0LBvayhvCeV2vTIuiBw== 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=4oXBXlz1PXhUrT/gIqbcF3JJEAWDQ0MIGQikaAT7xn4=; b=qlUOF+1AgmsEhSlO5pLofQJVSzK94czI1ySdXnVRH/YpaMOuoMZXAzbTVT1AZXboG4mLRsMVOlUTkHtZt1xF/JRftjN+OODlzCUDZSrmU/UYEVFijpitntYMHuwXTPDVrRCAhbIHUroO3aSklA12EvbZ7pXNLTltWWhb8HMHqDQ= Received: from BYAPR04MB5749.namprd04.prod.outlook.com (20.179.57.21) by BYAPR04MB5032.namprd04.prod.outlook.com (52.135.235.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2729.25; Wed, 19 Feb 2020 15:49:48 +0000 Received: from BYAPR04MB5749.namprd04.prod.outlook.com ([fe80::fdf8:bd6f:b33d:c2df]) by BYAPR04MB5749.namprd04.prod.outlook.com ([fe80::fdf8:bd6f:b33d:c2df%3]) with mapi id 15.20.2750.016; Wed, 19 Feb 2020 15:49:48 +0000 From: Chaitanya Kulkarni To: Christoph Hellwig , Keith Busch Subject: Re: [PATCH 0/4] nvmet: add set feature based timestamp support Thread-Topic: [PATCH 0/4] nvmet: add set feature based timestamp support Thread-Index: AQHV5qSDrr+fJYkaUU+d9tLCNoqMIA== Date: Wed, 19 Feb 2020 15:49:47 +0000 Message-ID: References: <20200218214338.25088-1-chaitanya.kulkarni@wdc.com> <20200218231007.GA18306@redsun51.ssa.fujisawa.hgst.com> <20200219145907.GA17748@lst.de> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Chaitanya.Kulkarni@wdc.com; x-originating-ip: [199.255.45.62] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 3be8e8bb-8882-4bad-619b-08d7b5535948 x-ms-traffictypediagnostic: BYAPR04MB5032: x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8273; x-forefront-prvs: 0318501FAE x-forefront-antispam-report: SFV:NSPM; SFS:(10019020)(4636009)(366004)(136003)(396003)(376002)(346002)(39860400002)(199004)(189003)(478600001)(55016002)(5660300002)(71200400001)(9686003)(86362001)(76116006)(7696005)(64756008)(66446008)(66556008)(66476007)(66946007)(186003)(53546011)(316002)(4326008)(6506007)(52536014)(81156014)(8676002)(4744005)(81166006)(26005)(2906002)(33656002)(8936002)(110136005)(54906003); DIR:OUT; SFP:1102; SCL:1; SRVR:BYAPR04MB5032; H:BYAPR04MB5749.namprd04.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: JgirwsukpioeK+FhFcV85CsJr4tJTPPSWHfAxOUiM2DMRt2fuVIe+X3/smXBxX31F6OXABdu2hcJmQlkCoYk10iZgfJcdkLttcyQK8SQcyyXPmStBhdaDWWYzVkixcbtFAY5AcJsZiUZvCVOiC9ooelzGee4XGJpF+4gUvBYnQ7UpKLjSQbaXvdBGQ94si4wnL6KfybLcAavmtIf4h3ySqvz9WhqGW1th3tG8uEUJBUQBlxgyAiX+K0nobypeVE4aLyOOfBb4A1X05Pqf3a0orJhnt1izTVMe42/W0E7XWx9k6WsO3NRIatW3G5F3EjFDVXGlUCuc+ymgK69NrJs3KbhCJJYQ468KqX7elRD6HJv6k9+2iXuSqWHdCtGiPNZu+iekdyMEV5f3dMqgemp7AO+mwA56a5oayJAJ+gZ1JjVw8V6UJIOdOYXTwydqWaR x-ms-exchange-antispam-messagedata: BuIcrkP9DCsakJyjEg6KAtu7ta2F/B/rnmAGPJLLnEBFvPm5dYmNgqFC98KqdVRP/iehsMOcFuglx/+uqakZ15OlwChrvPScxuPJPSaLANVU2eV+n/cxxSul89fPtdxwsysbq45QkDPh5dvKZfxC4Q== x-ms-exchange-transport-forked: True MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3be8e8bb-8882-4bad-619b-08d7b5535948 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Feb 2020 15:49:47.8654 (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: gyGtiskUOtxfFvz6KhxbJ1HVygbtcCRqJPq9f63qEWf0ueH0wEw8ILIegcSozqXrR/NkCQCghDBGzejnHdHUiGMZELPudakyPXWTwbP+n5Y= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR04MB5032 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200219_074956_006235_0F5C8B03 X-CRM114-Status: GOOD ( 12.87 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "sagi@grimberg.me" , "linux-nvme@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 02/19/2020 06:59 AM, Christoph Hellwig wrote: > On Wed, Feb 19, 2020 at 08:10:07AM +0900, Keith Busch wrote: >> The last three ought to be a single patch IMO since those should really >> from an inseparable package deal for this feature. > > Agreed. > Agree, just made series into small chunks so that it will be easier for a reviewer to go through changes in a botttom up manner. >> As to why we'd support this feature, the spec says "The use of the >> Timestamp is outside the scope of this specification". Is there anything >> interesting we can do with this? > > I can't really think of why this is useful either.. > If a host is dealing with different controllers which are on a different machines it will be easier to sync timestamp and read it's value. Although spec doesn't specify the right use, having this feature will allow application(s) (if any) to use it if needed. _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme