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Wed, 24 Jul 2019 11:53:42 +0000 Received: from DB7PR05MB4138.eurprd05.prod.outlook.com ([fe80::9115:7752:2368:e7ec]) by DB7PR05MB4138.eurprd05.prod.outlook.com ([fe80::9115:7752:2368:e7ec%4]) with mapi id 15.20.2094.013; Wed, 24 Jul 2019 11:53:42 +0000 From: Jason Gunthorpe To: Christoph Hellwig CC: Ralph Campbell , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , =?iso-8859-1?Q?J=E9r=F4me_Glisse?= Subject: Re: [PATCH 2/2] mm/hmm: make full use of walk_page_range() Thread-Topic: [PATCH 2/2] mm/hmm: make full use of walk_page_range() Thread-Index: AQHVQa6dZmZInZmjtUOST7LDwfSgk6bZVScAgABUVwA= Date: Wed, 24 Jul 2019 11:53:42 +0000 Message-ID: <20190724115338.GA30264@mellanox.com> References: <20190723233016.26403-1-rcampbell@nvidia.com> <20190723233016.26403-3-rcampbell@nvidia.com> <20190724065146.GA2061@lst.de> In-Reply-To: <20190724065146.GA2061@lst.de> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MN2PR10CA0025.namprd10.prod.outlook.com (2603:10b6:208:120::38) To DB7PR05MB4138.eurprd05.prod.outlook.com (2603:10a6:5:23::16) authentication-results: spf=none (sender IP is ) smtp.mailfrom=jgg@mellanox.com; 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received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: 7R2YgFtzTCR5D2IbgBNrlgUaAMNCNk6gD+IQoByXCQePyahHA9oIqH6K0+cd4gdTR7LEcJ7Q1mMfyefg1M7m7o8RDXwXWxypfmevvdgJsLu6wQFe88ZWDsjukH6UhK5me1NgDWQjgMLFbh8++3hriQE2xopHA34zfxYfsMzyur10ZvEfd5yIMCR2YjzNeWZsNgW/ba/ym1EtjRg5YtOjiYoEFgZBazvsJvx05X92Fcqa7yCWfm6H7JFW90UyTTpNVykA0oyHPTAkH7lp/tBQsQ3mpskeMuBRkDKduBPvHl6KmJFDUXqPy97ovRBiozB4xj4vwkioK1fluh4wFvmq53nUiw3MzejgGvjYXZL2Ffn7wFHxlCqffSjj29dU9YIBsvPwV+2w8MEkKZD6jpSOBhbwLPgyUU0Uyyr6LcEW9Kw= Content-Type: text/plain; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: bd513704-5974-4d86-dc6a-08d7102d92c5 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jul 2019 11:53:42.1875 (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: jgg@mellanox.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB7PR05MB4889 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Jul 24, 2019 at 08:51:46AM +0200, Christoph Hellwig wrote: > On Tue, Jul 23, 2019 at 04:30:16PM -0700, Ralph Campbell wrote: > > hmm_range_snapshot() and hmm_range_fault() both call find_vma() and > > walk_page_range() in a loop. This is unnecessary duplication since > > walk_page_range() calls find_vma() in a loop already. > > Simplify hmm_range_snapshot() and hmm_range_fault() by defining a > > walk_test() callback function to filter unhandled vmas. >=20 > I like the approach a lot! >=20 > But we really need to sort out the duplication between hmm_range_fault > and hmm_range_snapshot first, as they are basically the same code. I > have patches here: >=20 > http://git.infradead.org/users/hch/misc.git/commitdiff/a34ccd30ee8a8a3111= d9e91711c12901ed7dea74 >=20 > http://git.infradead.org/users/hch/misc.git/commitdiff/81f442ebac7170815a= f7770a1efa9c4ab662137e Yeah, that is a straightforward improvement, maybe Ralph should grab these two as part of his series? > That being said we don't really have any users for the snapshot mode > or non-blocking faults, and I don't see any in the immediate pipeline > either. If this code was production ready I'd use it in ODP right away. When we first create a ODP MR we'd want to snapshot to pre-load the NIC tables with something other than page fault, but not fault anything. This would be a big performance improvement for ODP. Jason