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Tue, 14 Jan 2020 12:45:26 +0000 Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1irLZT-0005oa-5y; Tue, 14 Jan 2020 08:45:23 -0400 From: Jason Gunthorpe To: Ralph Campbell CC: "linux-rdma@vger.kernel.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , Jerome Glisse , John Hubbard , Christoph Hellwig , Andrew Morton , Shuah Khan Subject: Re: [PATCH v5 1/2] mm/mmu_notifier: make interval notifier updates safe Thread-Topic: [PATCH v5 1/2] mm/mmu_notifier: make interval notifier updates safe Thread-Index: AQHVtEsczeksfKC51EmFDx7aa5U3hKfi4tSAgAAlPICAABeZAIAGPeMAgADq14A= Date: Tue, 14 Jan 2020 12:45:26 +0000 Message-ID: <20200114124523.GM20978@mellanox.com> References: <20191216195733.28353-1-rcampbell@nvidia.com> <20191216195733.28353-2-rcampbell@nvidia.com> <20200109194805.GK20978@mellanox.com> <73225ded-c22d-33f2-ebcb-b9e9aa95266b@nvidia.com> <20200109232548.GO20978@mellanox.com> <633a3dda-d4d7-1233-b290-53d36fb8fda1@nvidia.com> In-Reply-To: <633a3dda-d4d7-1233-b290-53d36fb8fda1@nvidia.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MN2PR03CA0014.namprd03.prod.outlook.com (2603:10b6:208:23a::19) To VI1PR05MB4141.eurprd05.prod.outlook.com (2603:10a6:803:44::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=jgg@mellanox.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [142.68.57.212] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: ae819793-7c8f-46f6-77d2-08d798efa101 x-ms-traffictypediagnostic: VI1PR05MB4303: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; x-forefront-prvs: 028256169F x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(4636009)(366004)(189003)(199004)(8676002)(52116002)(66446008)(1076003)(2616005)(558084003)(186003)(26005)(54906003)(8936002)(5660300002)(9746002)(9786002)(7416002)(86362001)(81156014)(81166006)(15650500001)(33656002)(66476007)(2906002)(4326008)(6916009)(66946007)(66556008)(71200400001)(36756003)(498600001)(64756008)(24400500001);DIR:OUT;SFP:1101;SCL:1;SRVR:VI1PR05MB4303;H:VI1PR05MB4141.eurprd05.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-ID: <52D9FE7B2FA91941B468D6267DA6CA97@eurprd05.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: ae819793-7c8f-46f6-77d2-08d798efa101 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Jan 2020 12:45:26.4007 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: WG8snBU0whMrxb8KX6wF6m8c6bzM1eXPhDH5VZHhHl73HClbzcm/KK1Qblb9H/SpA40sYK8ziaDvtweXk7lpYQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR05MB4303 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Mon, Jan 13, 2020 at 02:44:52PM -0800, Ralph Campbell wrote: > I'm using the device driver lock to serialize find/insert/update/remove > changes to the interval tree. The device driver lock can't really fully serialize this as it doesn't effect how the intersection lookup runs. Jason