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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,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 E6740C433DB for ; Thu, 25 Mar 2021 13:56:23 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 AB8FC61A26 for ; Thu, 25 Mar 2021 13:56:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB8FC61A26 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 07B136ED82; Thu, 25 Mar 2021 13:56:23 +0000 (UTC) Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2063.outbound.protection.outlook.com [40.107.244.63]) by gabe.freedesktop.org (Postfix) with ESMTPS id BA3826ED80 for ; Thu, 25 Mar 2021 13:56:21 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=l/EQdy9MypPXjzDTq6zDglIQ260kd4C9C7R9u0FS77p+DkPGV//JCK+OfSBX8ZsS4DDQz5sZ5AhFb1tfY7VyMmfIi9dOJqRAdF0v74XuYDWMSvlf0ejnbfvhNdve/AA6sJrkHJw+SN+Z7od69Fa6yZGxi6Kdf8o2UIS+SbYJmQxMIgSwTvBdmtqbr4XSqy0t7Y8V4i3JDGqwV8nHeTl5Arcqg8mBVASHlscWhBr2k7gkVnHpVNy25DEA/we4aTLj9tvpNx4zNadQfaPCAfE/oyXjm31ZmaPVoTA/X4bl3m7Jc+wb/jUu7R8462T08yf/x4y40CSJvx8VVjyvx07nzw== 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=0spEM3RsqLiePQWkSRAtPAlUKfPyTADcljsaQzGDewA=; b=nRQAp5gm3dLRYgv8QReRLnIRRyN1vPExEVZMdashUOxQUUR+HuwRkuBKl33+e+PCz07g54USUfcno0lqJ1tJzA1e4Wc6JoujE1kOSIk003rerRqTUO45GvzJUXVf9thPbOWeQNWQDAp7talTmxO8h8RoPDYEWZFy1Lx8CIZ89s7RGACN8fBfFeYZ+AfR+DW06c8SC8qqiDEKX33stsPgHTrNAx2fagfzSQ7Ijzepkfv7sQUQylAHtevGN7zUSZp0DDjw4lPqaF8HaQ0m5e3dAB25Hemir7Jag6d0yfHRG9ztq0W1kzBxO6ZCpHVsgwZB3Q08LuvnNY6aPEQ6tBSHrg== 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=0spEM3RsqLiePQWkSRAtPAlUKfPyTADcljsaQzGDewA=; b=UpHgznq46m3mjpPnGdq5eNZyHB6K9YJTbjUrIID+cGBi9HOKdvQKpCzsSUKHJVJQui6pWLxwhMf0uz1RnooSro+IKrDU6p5hMCo7Ugm8bShJvmTigcbJ9gG09tNiEFv21Obd5ZOepR7KCofxGuIOcae8z3nWBHGTE073JElUj2/VnMXDKqIxiLsdxi8eOP6xN68qGlHp3mF9Lpk8iW/YbMr1mH/2ybRjxjuMzwI5DQrFa7/xIn7kI4W0PeWlqJgI680oVB1H0AoLh6BDxH4rNImBocnUttFWOewsITheB1Ma9sx43aXHiJxu+Bpzq/rTD7vnMtg5OnJ06KKIGgVmqw== Authentication-Results: amd.com; dkim=none (message not signed) header.d=none;amd.com; dmarc=none action=none header.from=nvidia.com; Received: from DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) by DM6PR12MB2937.namprd12.prod.outlook.com (2603:10b6:5:181::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.25; Thu, 25 Mar 2021 13:56:20 +0000 Received: from DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::1c62:7fa3:617b:ab87]) by DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::1c62:7fa3:617b:ab87%6]) with mapi id 15.20.3977.029; Thu, 25 Mar 2021 13:56:20 +0000 Date: Thu, 25 Mar 2021 10:56:18 -0300 From: Jason Gunthorpe To: Christian =?utf-8?B?S8O2bmln?= Subject: Re: [RFC PATCH 1/2] mm,drm/ttm: Block fast GUP to TTM huge pages Message-ID: <20210325135618.GZ2356281@nvidia.com> References: <20210325113023.GT2356281@nvidia.com> <20210325120103.GV2356281@nvidia.com> <20210325124206.GA599656@nvidia.com> <00f79bae-75c4-d694-8dc9-35ac21cd1006@amd.com> <20210325131756.GX2356281@nvidia.com> <13227fd0-6c41-992e-63e7-877f718c1577@amd.com> <20210325133347.GY2356281@nvidia.com> <8cf06da9-2a08-45c4-1339-bcc38fdd04df@amd.com> Content-Disposition: inline In-Reply-To: <8cf06da9-2a08-45c4-1339-bcc38fdd04df@amd.com> X-Originating-IP: [206.223.160.26] X-ClientProxiedBy: CH2PR20CA0015.namprd20.prod.outlook.com (2603:10b6:610:58::25) To DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (206.223.160.26) by CH2PR20CA0015.namprd20.prod.outlook.com (2603:10b6:610:58::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.26 via Frontend Transport; Thu, 25 Mar 2021 13:56:19 +0000 Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1lPQTC-002Xjs-JX; Thu, 25 Mar 2021 10:56:18 -0300 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e4627911-a466-4667-3de7-08d8ef95c478 X-MS-TrafficTypeDiagnostic: DM6PR12MB2937: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; X-MS-Exchange-SenderADCheck: 1 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:DM6PR12MB3834.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(396003)(39860400002)(376002)(136003)(346002)(366004)(66556008)(1076003)(66946007)(186003)(66476007)(38100700001)(2906002)(426003)(4326008)(9746002)(83380400001)(6916009)(36756003)(26005)(9786002)(5660300002)(2616005)(54906003)(8676002)(33656002)(8936002)(86362001)(478600001)(316002)(14583001); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?dXF3VnlOV0kzNjk0T0hkcEEzdXVlVGtaUnl0SGZGQkJsb3c3VUxIWml3V0RJ?= =?utf-8?B?Ukh3OUtSTE1PNFpDcHRDaENRd28wZXFQVjBaN0xVOHVzZCswUTdQQWgxWk5D?= =?utf-8?B?ZHdjcEN4REcrZ1E5Z1BKN0FlVlJ3K2JTblpjcFBCUDdUMTdycDNGb3JRb3Zj?= =?utf-8?B?eHFSS1RDaTNkRTVPanBjczFycjVZT2p1Uy9lWTBnRGtGT0UwMmFlVlN0ZWhw?= =?utf-8?B?SkExTTVrWnBHMGhJbjFteVI1L0t5bjlJQmp0UTErL3hFelVLd0twenhNZVZG?= =?utf-8?B?QXF3dVBJZjV5VUZvQ1ZBWjdpcFRlR3huTzFrKzBpcXBQTzFmcStVek1Td0Iv?= =?utf-8?B?MktIc3Zwb3ZhUkJ5UEt1bFZaSVhpWWFYUHk3L3gvdzZxYjFlTHY1eGZFZk04?= =?utf-8?B?TU5qaFpLUDltR2h0WitBNUNQRGJzYWF4MTZKMEtQc2haQWN0L0k5QTVMblpB?= =?utf-8?B?YUJCajVJaGZSRCtnN2pjTXZqbFBzQmZjRlp3U25DaWZoZ3BiOE1wS2ViQURl?= =?utf-8?B?WTlYZlJDcTQxd0ZkRTNuU0orZkQ4WHJaS3liRjRCQnZVazlsand6Q00vVFZi?= =?utf-8?B?OU5JQUd3bTZFK1hWM3YzT1YveUg2amxBbzdBZHNaSVU1RVdYOGtQUjBXaDVy?= =?utf-8?B?OVkwZUNpZmlLaU5zZUdHQUhQaEYzTTJVU2ZQNjNBSFpIemgrKzRFQVlaQzZx?= =?utf-8?B?T3BJaTlqNXZWRkVWaGlVZU9La0dpdTBVWXNIZEtnN0FObFRVK0tKOEVXdnFH?= =?utf-8?B?NGFld0NsWkNFWTZrUnlRMVk4blpYMmVnQXhWV09VZ01jUERMdkY1empFWnVX?= =?utf-8?B?L2hKcjVVSzFwZnVLUTg4U3RsOWJubFJ2WUNlc2hJMXduK0JZOS9teTY3eVdY?= =?utf-8?B?VVYva1NKOE41UDVDSERqdE9qYk1LT0lCSlRiQ1pFcU5mOVRKTG9oNDg2eTlo?= =?utf-8?B?bFluRUdVMmtuWWpQV0pFY2drMGJYZkJyMHljTnZRR0VIUFBScUlFcTVBRkpz?= =?utf-8?B?c3RkQUJGZ0lDNDh0MDJHc2hBR29uWlpmUDJCdlRhcGJFRmVSNzVJMzJGdDFX?= =?utf-8?B?K1ZRS1ZxZHdMU1B4OUJJOUkvWnd6cWxmNGYvM2hNTmQxbmtxdXVOZ291NnNX?= =?utf-8?B?RnN2NDFGVkw4M081OG9nU0ZZaEtZZWx2ckRyclZsMG1DSDF4NUMzSWhra2hV?= =?utf-8?B?WnZjUUNJbmcycm1sV21SNVVSMS9pTUdobUNxVkpMUW9TWHc0cmtHWndyYTQx?= =?utf-8?B?RVpCN3FUY0s0V2prZC9DVGZLWEtORENMVG81YWlmclo1YlNtUE9iYi9lQXdv?= =?utf-8?B?RDhhV2phNkV0VXhpbXl3SEljT0JFd3NTYzAweDhscXoxWkVOZTFqOWJ1NWt2?= =?utf-8?B?T1JST3c3c1lzV01hRERrSUNFcll3M1lXbXdoMVY5bGk2b09kSWNlTEN0VUhl?= =?utf-8?B?MWZLMlhKTEZQdUpRNjhsU1BRdGxrV3FTMVpCRHIzaXplT3l3R0Jndy9HTjVZ?= =?utf-8?B?YkU0SzRrR1VRbjBIVm55NE1oVDVHdDVxV0xhNWZZRDcrOXVHZlRlcm9TWTU3?= =?utf-8?B?NDc0UTYxYmlJcTZzd3EyMlZXWFhaKzhpWFNsa0xmNHFvSzREWWh3V1ZaZkd5?= =?utf-8?B?K21SdFhNY21vczV6Wll3aDV5M2tCZnNGajlEMU5vb0Yra3JFNll3Q2VyUUZ4?= =?utf-8?B?ejBSUFM2V0tFbmx3OVdUeTdRaWI2Z2QxM3lubkNmOFJzM1hyNnpNOFptWkpS?= =?utf-8?Q?L0MflCVX5eTa6ddUi9lbbhPu7H+1LrGUxAReBav?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: e4627911-a466-4667-3de7-08d8ef95c478 X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3834.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Mar 2021 13:56:19.9334 (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: qdZPIaPUJrYkTJtdMCAFrdICFoHjobXqId8hrQQGTrkzTyn1sW3AmF5QdSdxEonL X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB2937 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Airlie , Thomas =?utf-8?B?SGVsbHN0csO2bSAoSW50ZWwp?= , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Andrew Morton Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" T24gVGh1LCBNYXIgMjUsIDIwMjEgYXQgMDI6NTQ6MzFQTSArMDEwMCwgQ2hyaXN0aWFuIEvDtm5p ZyB3cm90ZToKCj4gPiBUaGUgZ29hbCBpcyB0byBvcHRpbWl6ZSBsYXJnZSBwYWdlIHNpemUgdXNh Z2UgaW4gdGhlIHBhZ2UgdGFibGVzLgo+ID4gCj4gPiBUaGVyZSBhcmUgdGhyZWUgY3JpdGVyYSB0 aGF0IGltcGFjdCB0aGlzOgo+ID4gICAxKSBUaGUgcG9zc2libGUgQ1BVIHBhZ2UgdGFibGUgc2l6 ZXMKPiA+ICAgMikgVGhlIHVzZWZ1bCBjb250aWd1aXR5IHRoZSBkZXZpY2UgY2FuIGNyZWF0ZSBp biBpdHMgaW9tZW1vcnkKPiA+ICAgMykgVGhlIFZBJ3MgYWxpZ25tZW50LCBhcyB0aGlzIHNldHMg YW4gdXBwZXIgYm91bmQgb24gMSBhbmQgMgo+ID4gCj4gPiBJZiBhIGRldmljZSBoYXMgMjU2ayBw YWdlcyBhbmQgdGhlIGFyY2ggc3VwcG9ydHMgMk0gYW5kIDRrIHRoZW4gdGhlIFZBCj4gPiBzaG91 bGQgYWxpZ24gdG8gc29tZXdoZXJlIGJldHdlZW4gNGsgYW5kIDI1NmsuIFRoZSBpZGVhbCBhbGln bm1lbnQKPiA+IHdvdWxkIGJlIHRvIG9wdGltaXplIFBURSB1c2FnZSB3aGVuIHN0dWZmaW5nIDI1 NmsgYmxvY2tzIGJ5IGZ1bGx5Cj4gPiBwb3B1bGF0aW5nIFBURXMgYW5kIGRlcGVuZHMgb24gdGhl IGFyY2gncyAjIG9mIFBURSdzIHBlciBwYWdlLgo+IAo+IEFoISBTbyB5b3Ugd2FudCB0byBhbHNv IGF2b2lkIHRoYXQgd2Ugb25seSBoYWx2ZSBwb3B1bGF0ZSBhIFBURXMgYXMgd2VsbCEKPiBUaGF0 IHJhdGhlciBuaWZ0eS4KPiAKPiBCdXQgeW91IGRvbid0IG5lZWQgdGhlIGRldmljZSBwYWdlIHNp emUgZm9yIHRoaXMuIEp1c3QgbG9va2luZyBhdCB0aGUgc2l6ZQo+IG9mIHRoZSBtYXBwaW5nIHNo b3VsZCBiZSBlbm91Z2guCgpXZWxsLCBraW5kIG9mLCBhdCBhIGNlcnRhaW4gcG9pbnQgd2Ugc3Rh cnQgdG8gb3Zlci1hbGlnbiB0aGluZ3Mgd2hpY2gKaXMgYSBiaXQgaGFybWZ1bCB0b28sIGl0IGlz IGJlc3QgdG8gY2FwIGl0IGF0IHdoYXQgdGhlIGRldmljZSBjb3VsZAphY3R1YWxseSB1c2UsIElN SE8uCgpLZWVwIGluIG1pbmQgYWRkcmVzcyBzcGFjZSBpcyBub3QgZnJlZSwgYW5kIDMyIGJpdCBp biBwYXJ0aWN1bGFyIG5lZWRzCnRvIGJlIGVmZmljaWVudC4KCkphc29uCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1kZXZlbCBtYWlsaW5nIGxpc3QK ZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVkZXNrdG9w Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbAo= 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS 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 D1149C433E0 for ; Thu, 25 Mar 2021 13:56:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6EF8361A1F for ; Thu, 25 Mar 2021 13:56:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6EF8361A1F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 088936B0071; Thu, 25 Mar 2021 09:56:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 05F946B0072; Thu, 25 Mar 2021 09:56:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D57876B0073; Thu, 25 Mar 2021 09:56:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0125.hostedemail.com [216.40.44.125]) by kanga.kvack.org (Postfix) with ESMTP id B6F846B0071 for ; Thu, 25 Mar 2021 09:56:24 -0400 (EDT) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 7467D184F049C for ; Thu, 25 Mar 2021 13:56:24 +0000 (UTC) X-FDA: 77958546288.12.22F513C Received: from NAM10-BN7-obe.outbound.protection.outlook.com (mail-bn7nam10on2072.outbound.protection.outlook.com [40.107.92.72]) by imf27.hostedemail.com (Postfix) with ESMTP id A7ECD80192E5 for ; Thu, 25 Mar 2021 13:56:19 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=l/EQdy9MypPXjzDTq6zDglIQ260kd4C9C7R9u0FS77p+DkPGV//JCK+OfSBX8ZsS4DDQz5sZ5AhFb1tfY7VyMmfIi9dOJqRAdF0v74XuYDWMSvlf0ejnbfvhNdve/AA6sJrkHJw+SN+Z7od69Fa6yZGxi6Kdf8o2UIS+SbYJmQxMIgSwTvBdmtqbr4XSqy0t7Y8V4i3JDGqwV8nHeTl5Arcqg8mBVASHlscWhBr2k7gkVnHpVNy25DEA/we4aTLj9tvpNx4zNadQfaPCAfE/oyXjm31ZmaPVoTA/X4bl3m7Jc+wb/jUu7R8462T08yf/x4y40CSJvx8VVjyvx07nzw== 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=0spEM3RsqLiePQWkSRAtPAlUKfPyTADcljsaQzGDewA=; b=nRQAp5gm3dLRYgv8QReRLnIRRyN1vPExEVZMdashUOxQUUR+HuwRkuBKl33+e+PCz07g54USUfcno0lqJ1tJzA1e4Wc6JoujE1kOSIk003rerRqTUO45GvzJUXVf9thPbOWeQNWQDAp7talTmxO8h8RoPDYEWZFy1Lx8CIZ89s7RGACN8fBfFeYZ+AfR+DW06c8SC8qqiDEKX33stsPgHTrNAx2fagfzSQ7Ijzepkfv7sQUQylAHtevGN7zUSZp0DDjw4lPqaF8HaQ0m5e3dAB25Hemir7Jag6d0yfHRG9ztq0W1kzBxO6ZCpHVsgwZB3Q08LuvnNY6aPEQ6tBSHrg== 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=0spEM3RsqLiePQWkSRAtPAlUKfPyTADcljsaQzGDewA=; b=UpHgznq46m3mjpPnGdq5eNZyHB6K9YJTbjUrIID+cGBi9HOKdvQKpCzsSUKHJVJQui6pWLxwhMf0uz1RnooSro+IKrDU6p5hMCo7Ugm8bShJvmTigcbJ9gG09tNiEFv21Obd5ZOepR7KCofxGuIOcae8z3nWBHGTE073JElUj2/VnMXDKqIxiLsdxi8eOP6xN68qGlHp3mF9Lpk8iW/YbMr1mH/2ybRjxjuMzwI5DQrFa7/xIn7kI4W0PeWlqJgI680oVB1H0AoLh6BDxH4rNImBocnUttFWOewsITheB1Ma9sx43aXHiJxu+Bpzq/rTD7vnMtg5OnJ06KKIGgVmqw== Authentication-Results: amd.com; dkim=none (message not signed) header.d=none;amd.com; dmarc=none action=none header.from=nvidia.com; Received: from DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) by DM6PR12MB2937.namprd12.prod.outlook.com (2603:10b6:5:181::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.25; Thu, 25 Mar 2021 13:56:20 +0000 Received: from DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::1c62:7fa3:617b:ab87]) by DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::1c62:7fa3:617b:ab87%6]) with mapi id 15.20.3977.029; Thu, 25 Mar 2021 13:56:20 +0000 Date: Thu, 25 Mar 2021 10:56:18 -0300 From: Jason Gunthorpe To: Christian =?utf-8?B?S8O2bmln?= Cc: Thomas =?utf-8?B?SGVsbHN0csO2bSAoSW50ZWwp?= , David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Andrew Morton Subject: Re: [RFC PATCH 1/2] mm,drm/ttm: Block fast GUP to TTM huge pages Message-ID: <20210325135618.GZ2356281@nvidia.com> References: <20210325113023.GT2356281@nvidia.com> <20210325120103.GV2356281@nvidia.com> <20210325124206.GA599656@nvidia.com> <00f79bae-75c4-d694-8dc9-35ac21cd1006@amd.com> <20210325131756.GX2356281@nvidia.com> <13227fd0-6c41-992e-63e7-877f718c1577@amd.com> <20210325133347.GY2356281@nvidia.com> <8cf06da9-2a08-45c4-1339-bcc38fdd04df@amd.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <8cf06da9-2a08-45c4-1339-bcc38fdd04df@amd.com> X-Originating-IP: [206.223.160.26] X-ClientProxiedBy: CH2PR20CA0015.namprd20.prod.outlook.com (2603:10b6:610:58::25) To DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (206.223.160.26) by CH2PR20CA0015.namprd20.prod.outlook.com (2603:10b6:610:58::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.26 via Frontend Transport; Thu, 25 Mar 2021 13:56:19 +0000 Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1lPQTC-002Xjs-JX; Thu, 25 Mar 2021 10:56:18 -0300 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e4627911-a466-4667-3de7-08d8ef95c478 X-MS-TrafficTypeDiagnostic: DM6PR12MB2937: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; X-MS-Exchange-SenderADCheck: 1 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:DM6PR12MB3834.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(396003)(39860400002)(376002)(136003)(346002)(366004)(66556008)(1076003)(66946007)(186003)(66476007)(38100700001)(2906002)(426003)(4326008)(9746002)(83380400001)(6916009)(36756003)(26005)(9786002)(5660300002)(2616005)(54906003)(8676002)(33656002)(8936002)(86362001)(478600001)(316002)(14583001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?dXF3VnlOV0kzNjk0T0hkcEEzdXVlVGtaUnl0SGZGQkJsb3c3VUxIWml3V0RJ?= =?utf-8?B?Ukh3OUtSTE1PNFpDcHRDaENRd28wZXFQVjBaN0xVOHVzZCswUTdQQWgxWk5D?= =?utf-8?B?ZHdjcEN4REcrZ1E5Z1BKN0FlVlJ3K2JTblpjcFBCUDdUMTdycDNGb3JRb3Zj?= =?utf-8?B?eHFSS1RDaTNkRTVPanBjczFycjVZT2p1Uy9lWTBnRGtGT0UwMmFlVlN0ZWhw?= =?utf-8?B?SkExTTVrWnBHMGhJbjFteVI1L0t5bjlJQmp0UTErL3hFelVLd0twenhNZVZG?= =?utf-8?B?QXF3dVBJZjV5VUZvQ1ZBWjdpcFRlR3huTzFrKzBpcXBQTzFmcStVek1Td0Iv?= =?utf-8?B?MktIc3Zwb3ZhUkJ5UEt1bFZaSVhpWWFYUHk3L3gvdzZxYjFlTHY1eGZFZk04?= =?utf-8?B?TU5qaFpLUDltR2h0WitBNUNQRGJzYWF4MTZKMEtQc2haQWN0L0k5QTVMblpB?= =?utf-8?B?YUJCajVJaGZSRCtnN2pjTXZqbFBzQmZjRlp3U25DaWZoZ3BiOE1wS2ViQURl?= =?utf-8?B?WTlYZlJDcTQxd0ZkRTNuU0orZkQ4WHJaS3liRjRCQnZVazlsand6Q00vVFZi?= =?utf-8?B?OU5JQUd3bTZFK1hWM3YzT1YveUg2amxBbzdBZHNaSVU1RVdYOGtQUjBXaDVy?= =?utf-8?B?OVkwZUNpZmlLaU5zZUdHQUhQaEYzTTJVU2ZQNjNBSFpIemgrKzRFQVlaQzZx?= =?utf-8?B?T3BJaTlqNXZWRkVWaGlVZU9La0dpdTBVWXNIZEtnN0FObFRVK0tKOEVXdnFH?= =?utf-8?B?NGFld0NsWkNFWTZrUnlRMVk4blpYMmVnQXhWV09VZ01jUERMdkY1empFWnVX?= =?utf-8?B?L2hKcjVVSzFwZnVLUTg4U3RsOWJubFJ2WUNlc2hJMXduK0JZOS9teTY3eVdY?= =?utf-8?B?VVYva1NKOE41UDVDSERqdE9qYk1LT0lCSlRiQ1pFcU5mOVRKTG9oNDg2eTlo?= =?utf-8?B?bFluRUdVMmtuWWpQV0pFY2drMGJYZkJyMHljTnZRR0VIUFBScUlFcTVBRkpz?= =?utf-8?B?c3RkQUJGZ0lDNDh0MDJHc2hBR29uWlpmUDJCdlRhcGJFRmVSNzVJMzJGdDFX?= =?utf-8?B?K1ZRS1ZxZHdMU1B4OUJJOUkvWnd6cWxmNGYvM2hNTmQxbmtxdXVOZ291NnNX?= =?utf-8?B?RnN2NDFGVkw4M081OG9nU0ZZaEtZZWx2ckRyclZsMG1DSDF4NUMzSWhra2hV?= =?utf-8?B?WnZjUUNJbmcycm1sV21SNVVSMS9pTUdobUNxVkpMUW9TWHc0cmtHWndyYTQx?= =?utf-8?B?RVpCN3FUY0s0V2prZC9DVGZLWEtORENMVG81YWlmclo1YlNtUE9iYi9lQXdv?= =?utf-8?B?RDhhV2phNkV0VXhpbXl3SEljT0JFd3NTYzAweDhscXoxWkVOZTFqOWJ1NWt2?= =?utf-8?B?T1JST3c3c1lzV01hRERrSUNFcll3M1lXbXdoMVY5bGk2b09kSWNlTEN0VUhl?= =?utf-8?B?MWZLMlhKTEZQdUpRNjhsU1BRdGxrV3FTMVpCRHIzaXplT3l3R0Jndy9HTjVZ?= =?utf-8?B?YkU0SzRrR1VRbjBIVm55NE1oVDVHdDVxV0xhNWZZRDcrOXVHZlRlcm9TWTU3?= =?utf-8?B?NDc0UTYxYmlJcTZzd3EyMlZXWFhaKzhpWFNsa0xmNHFvSzREWWh3V1ZaZkd5?= =?utf-8?B?K21SdFhNY21vczV6Wll3aDV5M2tCZnNGajlEMU5vb0Yra3JFNll3Q2VyUUZ4?= =?utf-8?B?ejBSUFM2V0tFbmx3OVdUeTdRaWI2Z2QxM3lubkNmOFJzM1hyNnpNOFptWkpS?= =?utf-8?Q?L0MflCVX5eTa6ddUi9lbbhPu7H+1LrGUxAReBav?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: e4627911-a466-4667-3de7-08d8ef95c478 X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3834.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Mar 2021 13:56:19.9334 (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: qdZPIaPUJrYkTJtdMCAFrdICFoHjobXqId8hrQQGTrkzTyn1sW3AmF5QdSdxEonL X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB2937 X-Stat-Signature: yjutej4omrjxd9z66489q7j18dminp3i X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: A7ECD80192E5 Received-SPF: none (nvidia.com>: No applicable sender policy available) receiver=imf27; identity=mailfrom; envelope-from=""; helo=NAM10-BN7-obe.outbound.protection.outlook.com; client-ip=40.107.92.72 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616680579-365638 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000183, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Mar 25, 2021 at 02:54:31PM +0100, Christian K=C3=B6nig wrote: > > The goal is to optimize large page size usage in the page tables. > >=20 > > There are three critera that impact this: > > 1) The possible CPU page table sizes > > 2) The useful contiguity the device can create in its iomemory > > 3) The VA's alignment, as this sets an upper bound on 1 and 2 > >=20 > > If a device has 256k pages and the arch supports 2M and 4k then the V= A > > should align to somewhere between 4k and 256k. The ideal alignment > > would be to optimize PTE usage when stuffing 256k blocks by fully > > populating PTEs and depends on the arch's # of PTE's per page. >=20 > Ah! So you want to also avoid that we only halve populate a PTEs as wel= l! > That rather nifty. >=20 > But you don't need the device page size for this. Just looking at the s= ize > of the mapping should be enough. Well, kind of, at a certain point we start to over-align things which is a bit harmful too, it is best to cap it at what the device could actually use, IMHO. Keep in mind address space is not free, and 32 bit in particular needs to be efficient. Jason