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=-9.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham 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 155EAC433F5 for ; Thu, 9 Sep 2021 19:17:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 769FB6113E for ; Thu, 9 Sep 2021 19:17:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 769FB6113E Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id B944F900002; Thu, 9 Sep 2021 15:17:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B43DA6B0072; Thu, 9 Sep 2021 15:17:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9E4CC900002; Thu, 9 Sep 2021 15:17:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0183.hostedemail.com [216.40.44.183]) by kanga.kvack.org (Postfix) with ESMTP id 8FC216B006C for ; Thu, 9 Sep 2021 15:17:04 -0400 (EDT) Received: from smtpin35.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 3E88D18488929 for ; Thu, 9 Sep 2021 19:17:04 +0000 (UTC) X-FDA: 78568992768.35.AC78A8D Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2083.outbound.protection.outlook.com [40.107.244.83]) by imf06.hostedemail.com (Postfix) with ESMTP id BBC47801A89F for ; Thu, 9 Sep 2021 19:17:03 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=O4nYj/7aTXuHixjt7Di4nrYmtr38gjYWIhBZcFXtqs2RsoImZgZF6YRq7oyUUEz2I8tFUv5fqOz7rrWFtRqrK5K7r6UPthfO9fEktq00pttjAEXBcy8GtHXz58qVQTPwuKd6nTOVCwfrtffnP8tLRDBTOGwCtaN3/10XDLgqmDesIWoZ/rc7Pd9eIuvIRP+a6mMBY48cbbt9xqR9JkjGPBENv6lbFRqHaE0fFBFb4Fj/Pl0Y06meUgxyORzbi58HdLTUqCt1I84Mt+jnOqLIXgyo6XDvr3pQ++Otw/ds7ajU9b2uTkgcUYQOsiBcylSxhq5IC+VZA2+ayl4uhhyiIw== 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; bh=TbCch8g7QSpnxDEW2O2Uv4KnCVyYe4gOJNFZsOnhyA8=; b=cfsnDMa/eTbIT6NCZFrELlYeQdrm4VK/q+q+NHU1LBTDXQx38cS5gI+6yronUlFD5Tj3qNiIYwfIQ9dwcG9OXsgrP6dJOKtBECtI8goXD2P7kBW7scwAUxOlDa4/I+NpNmM5UyxnbwwNHhFR4Fcn5/dA/aTiAQBmZUXf22pflgz8fwkA7ONKTE3NKnOK25zV8YIxmyLzWfwdZQNY5F8fjT+LCp0am9IGaVVEzh0NxLrzpeo28YuFiOQ/6Eh6nZoQ8KHdQs+SJPNw640rxxj+r+6079SQv5/iE+SSrpNP2B+8s784aTlejB9n0tvCpZVoYDM8vZAFzw01o3y3mP7VAw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=TbCch8g7QSpnxDEW2O2Uv4KnCVyYe4gOJNFZsOnhyA8=; b=tacLhvYyikFX+EzV7hN93Zz42LFCAkl1XsN4lV7K/CtDpEdMtYOsq2xpc7hLGOQ8Qlq5MPItbdFEFxf/WvXh1yXYhd+B8GBqB5V0pWrIf2BFE3gub00ECPSXBK8Hze0SRDxdm2ebsgUSrpTXCGrtXWLKnXLw4jIKOEpet/upZckL/7ws4gNYZNWnPJHBgxYJ5Byi/2l2OZGPnSTIfOiZAg83tRi2VLCh/tA9tiXOhj9Q7FIvwk33toAVy2jinZag1rh3st7elvESbPg7InYmk20m8/DxrEXlaavzyCDUPumLGF9MA/QUBD/TKAL9ScTbwtPl0aNPdRAe+xr78TmGRg== Received: from BY5PR12MB4130.namprd12.prod.outlook.com (2603:10b6:a03:20b::16) by BYAPR12MB3334.namprd12.prod.outlook.com (2603:10b6:a03:df::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4500.15; Thu, 9 Sep 2021 19:17:01 +0000 Received: from BY5PR12MB4130.namprd12.prod.outlook.com ([fe80::6811:59ee:b39f:97b9]) by BY5PR12MB4130.namprd12.prod.outlook.com ([fe80::6811:59ee:b39f:97b9%9]) with mapi id 15.20.4500.016; Thu, 9 Sep 2021 19:17:01 +0000 Message-ID: <969bf3e2-89be-c25b-938e-38430dc836d3@nvidia.com> Date: Thu, 9 Sep 2021 12:17:00 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0 Subject: Re: [GIT PULL] Memory folios for v5.15 Content-Language: en-US To: Vlastimil Babka , Christoph Hellwig , Matthew Wilcox Cc: Linus Torvalds , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , Johannes Weiner References: <6b01d707-3ead-015b-eb36-7e3870248a22@suse.cz> From: John Hubbard In-Reply-To: <6b01d707-3ead-015b-eb36-7e3870248a22@suse.cz> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BY3PR03CA0020.namprd03.prod.outlook.com (2603:10b6:a03:39a::25) To BY5PR12MB4130.namprd12.prod.outlook.com (2603:10b6:a03:20b::16) MIME-Version: 1.0 Received: from [10.2.91.202] (216.228.112.21) by BY3PR03CA0020.namprd03.prod.outlook.com (2603:10b6:a03:39a::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4500.14 via Frontend Transport; Thu, 9 Sep 2021 19:17:01 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: cf63bd7e-f07b-455e-dc51-08d973c666d0 X-MS-TrafficTypeDiagnostic: BYAPR12MB3334: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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:BY5PR12MB4130.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(36756003)(16576012)(6486002)(316002)(110136005)(4326008)(53546011)(66556008)(86362001)(54906003)(66476007)(31696002)(66946007)(26005)(186003)(83380400001)(8676002)(31686004)(8936002)(38100700002)(2616005)(5660300002)(956004)(508600001)(2906002)(43740500002)(45980500001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?QVVweDREb1pWaEtCeWpsakM4Ylh1cG15T1JsT1BySC9iWkViUkdOQ1E4NlVi?= =?utf-8?B?V0FvNXBmUmh5eWloL0ZGRy8zbnRaMFJ3YmJNaVNsaWU4NG85eGRkSytXV2JT?= =?utf-8?B?RFlvdHVKQWpCS3ErMVR5MGpYSFovTVQvMldjTE40OW5obG90cEtJeG02alV1?= =?utf-8?B?cHpSSjFHeW5NazZuaWZJU1kxY1lPNklnZUNwUVdoc016TjZBTnV2RG9FSlJP?= =?utf-8?B?VmNCTUh3M1lTUUh6a3ViZzZITTNDMU05M09VTjkwdXRZV1VncDRxS1ptQXV5?= =?utf-8?B?TEQ3MDlIVUFTeElrRGxDbTNPakViRnN2ZDY2cDJhQlZ3QitMZTB0QnVWYUtG?= =?utf-8?B?Qmcwd2pYamhWcjUrREY1TDF0TjFCUGU3cy90WFRBdjMwbzNiTTJ5SFlRaGg4?= =?utf-8?B?eS9qL0RFNkVobUhRbUd6U2hxWE12MisyTjYyRFR3MUwxMHRpUlo1Y1lOZVlV?= =?utf-8?B?amRJeDE1YWppVW5Xa0h3YlN0MGEwcCtvbzZmVktvd0ErQWc3RVBGbEZvMG9N?= =?utf-8?B?aHJiTXNRMzJxKzJ2bE44bVYyVFF4MG10dDU5Vmt1WGtxWEZnT2IvSGM5ZHNS?= =?utf-8?B?TXRZVzRSUmh2Q3ArUk5VU3lPTDBsQXRXUTZ2VHk1emNGYWhkTm8yeHFRNHRW?= =?utf-8?B?ZmZIZ1loU050aFhYOGxlREdOd0k4d3NlWEFLM2J5RSs2Q0NQclk1N01xMEti?= =?utf-8?B?NjFGVFE1VldXNm9zOTd2aUU5ZDJyV3VIOUlwNElGNm5UWTRCTDVpUXRDdTBB?= =?utf-8?B?Ulp0RTNicFVPTXh2NVA4YzFrN2lFaW1VdXFHWm52VUhTMlhLeFprblQ3bHV5?= =?utf-8?B?TFpXRHc1MXhuTEgzZWdtRzJRaWZUQ3ZKS3Zac3oydi9WemVNMEc0blRzVUds?= =?utf-8?B?N1U4ZUMvU3JxNXZlZTVmc010R3VXNmFHN1ZsQnE2Q1FaMDAzTDBxajloS3lB?= =?utf-8?B?bm9yZnAvQnRhTDVxYzc3REptanhWYXd4TlRrcWZkdDhwd0dIdmdrdEQvNzMw?= =?utf-8?B?TFY0YS9MdllQYzQ5SHVVTEU1VFBTSlNRckNYTWxnamJKQTROTGgxSUdiVmVq?= =?utf-8?B?OXErbHNUcnFlcCtLY0Z3Nk83KzlTdW1KRStTWEFha1grS1hYUnZiK0NZdVQx?= =?utf-8?B?elpYRHJJRE53SjB1VFREYlMyb2F1M0RxOWpHZ0JNcFdNNDM4QXFDMktCR0ZJ?= =?utf-8?B?aklKMUdYQUR1NkNNYjBVNFE4VFFpSW0yY2o1WXQ5QWhzekxkVlc3NnRsdFlu?= =?utf-8?B?ZlpPZ3JjZWYxVnJzbU12WDVXcU45NktyRFFvVVF0OERabmJwVkVBcXVSalNk?= =?utf-8?B?N1UzMk5OVHNLN1o1TnU1M3lUS1ZnTmtyalFNUkdHUjgvM09sWS9rbHZlR1JM?= =?utf-8?B?Z1RhV1RYaGNEVWhaa1JQdEF3RUxwS1hsZlAvc3BWQ1dzMCtKVWFtWmtmaWVV?= =?utf-8?B?Sm5OeHZMNVJIYloyMnZyZ284dGFLd2szaUh2ZFlMVDFjWVVkbkNSVEo2SSsz?= =?utf-8?B?RTVFRXc4RmlrRmd1dWlXdHorNDQwV0ppQ0taQ1ZJd3loKzdoM3NKWlFVQ0ky?= =?utf-8?B?TUFEUFc0S3ZzbXFkTWVsSUhwVG1xQi9WbDRvenV2bnJKS2NZcGNWMjlHclVU?= =?utf-8?B?RnFkR1NuUG84czlzNW03dlVNdFY1UVFvcEhSMEtxYmUxY3ZJUW55aGFCa2xD?= =?utf-8?B?K0EyVzFqaVQ0UHJ2Z24wUUlvWTdCVWFyV0JCRkN5bjFHTHd1YllaNmR2R1Nz?= =?utf-8?Q?rOQJYnc2mRD+kgEmeYXHqdjR9HCIa1iWB0XEecv?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: cf63bd7e-f07b-455e-dc51-08d973c666d0 X-MS-Exchange-CrossTenant-AuthSource: BY5PR12MB4130.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Sep 2021 19:17:01.7260 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: mkGfU/9a5lu+He+nY4MCiJaaMoZMOfKKqJefYrwhahfldbqu6Jrqw0ayAmqRzpRILn6yQgH/S6+mJXzgONhZAA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB3334 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: BBC47801A89F Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=tacLhvYy; dmarc=pass (policy=quarantine) header.from=nvidia.com; spf=none (imf06.hostedemail.com: domain of jhubbard@nvidia.com has no SPF policy when checking 40.107.244.83) smtp.mailfrom=jhubbard@nvidia.com X-Stat-Signature: 8hhhma7xgb9peredyqiiu84fd1f9fk5t X-HE-Tag: 1631215023-154480 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 9/9/21 06:56, Vlastimil Babka wrote: > On 9/9/21 14:43, Christoph Hellwig wrote: >> So what is the result here? Not having folios (with that or another >> name) is really going to set back making progress on sane support for >> huge pages. Both in the pagecache but also for other places like direct >> I/O. > > Yeah, the silence doesn't seem actionable. If naming is the issue, I believe > Matthew had also a branch where it was renamed to pageset. If it's the > unclear future evolution wrt supporting subpages of large pages, should we > just do nothing until somebody turns that hypothetical future into code and > we see whether it works or not? > When I saw Matthew's proposal to rename folio --> pageset, my reaction was, "OK, this is a huge win!". Because: * The new name addressed Linus' concerns about naming, which unblocks it there, and * The new name seems to meet all of the criteria of the "folio" name, including even grep-ability, after a couple of tiny page_set and pageset cases are renamed--AND it also meets Linus' criteria for self-describing names. So I didn't want to add noise to that thread, but now that there is still some doubt about this, I'll pop up and suggest: do the huge 's/folio/pageset/g', and of course the associated renaming of the conflicting existing pageset and page_set cases, and then maybe it goes in. thanks, -- John Hubbard NVIDIA