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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26315C001E0 for ; Tue, 15 Aug 2023 02:34:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 746EE94000D; Mon, 14 Aug 2023 22:34:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6F55390000B; Mon, 14 Aug 2023 22:34:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 597B394000D; Mon, 14 Aug 2023 22:34:28 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 4B0C690000B for ; Mon, 14 Aug 2023 22:34:28 -0400 (EDT) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 2883A12082C for ; Tue, 15 Aug 2023 02:34:28 +0000 (UTC) X-FDA: 81124770216.27.56889AC Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2085.outbound.protection.outlook.com [40.107.243.85]) by imf03.hostedemail.com (Postfix) with ESMTP id 0EB3620014 for ; Tue, 15 Aug 2023 02:34:24 +0000 (UTC) Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=fBkBmkmV; spf=pass (imf03.hostedemail.com: domain of jhubbard@nvidia.com designates 40.107.243.85 as permitted sender) smtp.mailfrom=jhubbard@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1692066865; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=gNE9cOXeO1+RiH5+zFqxl+QYOhO06CjbqB3aqJiEdew=; b=T0rVXvdhhw/whVmvljAnT3tRPnrQ6s1YiUVZ7Q5m9fz+TAvufx8LkdlUcLz6t7O9bEkgEl MMVfkAwiMj0HsOrrss6pEPY9K7FwsTWCtyjKWgwvzenbSa7kfQGLg78gDYoa2F/23d88H6 Cb94RiPvSKdFbQGWgSnHJBVn4vbGrN0= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1692066865; a=rsa-sha256; cv=pass; b=MqXALCCITcRxoJPG58mGcAGmIXmhbIMZKNUXNefcWj8yNSWCPY/z5t+vg54KBH4f2bCqA1 aAmKd1PvDPUAUIiEfZ/jnuafX2WOpsqep+AzkHPsmQCj3mlwHyapsyaRATW+ifPSQj6P44 HxzV3ftJHplEfgbNhrKgbcy+vcIdV98= ARC-Authentication-Results: i=2; imf03.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=fBkBmkmV; spf=pass (imf03.hostedemail.com: domain of jhubbard@nvidia.com designates 40.107.243.85 as permitted sender) smtp.mailfrom=jhubbard@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=a1D0bv55kgkw9cFJ/PdoAPvNsx44xK4GOmmQoJq/C/Igr8cIbpQt7j0jKDO72kMAM1VWouMLiEryh2HRQO27lCQW+bs3NqvrEYJWaomQMj7jutfjVTTZIpnWGhZDFShll/QSNvpjrAQKJgEsgC9JrHFGTvLsifvh0onLMD1Vor2WmWyZtO5/sGnsEpLKCAZ9IKzx+YeRo3VkA3jLKHiyLYLuzplD19Se/3o9n8vQxMRbDc4F6i5unbgg+8cWPeHVROKm4NZsZKmc3vO+1eBnNNV3qd3qggB/Jq+x2l6/9v+XsdrZcLjJtt9IEHsoH6VqSaDHyMdg0UQvkiGH4rXb4g== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=gNE9cOXeO1+RiH5+zFqxl+QYOhO06CjbqB3aqJiEdew=; b=UrAjZQVWly2l+eK2GWk8zRfudzVrAb8Y0d4Bc/TlH5TwD6+0JEL9xE47XHf/aq7T5pc40JXeULiKbqSRNYquQnDWILqe1Kd8YYokq+X0lwI+SaAT5Yjw2MxSZZnop40VSUP8XjlNaw1CIXZvOvAbpN5Pbz7thqHsQVGpjDF81K9YmK+L/8YZqDoNIuTPvWHZUXULSQO98BMvuiQIHW3hHu7bTcNCnlyBfQZIvHQnwAfJX10x2+Bkbnwoba49NRFW7M9Gr1Wm683rd1sDfa7TSb59gR7GPoVtr+97D0rdTYzf2NpEbGFgInQvGV6dgoE3rIywgUTw/9g2ZtT/XYCl5Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.160) smtp.rcpttodomain=intel.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); 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=gNE9cOXeO1+RiH5+zFqxl+QYOhO06CjbqB3aqJiEdew=; b=fBkBmkmVgk6lmrKk7//rEI7KglallZZ4H33DdYGw9ICNYYmNAbhU39AllFtALOy2XQ0RwkTV5/4n5tLSr/HzRIFlmFk7lPvjyYHpERbeagxSDm/v4QM7iefTjjAX2987yBUV7Z47DWxBG3nX+Yp2JCouFVtq4SMdllNA9sqKon7rbATVWj+ijTLSbq8hJFmLzpXS6d5i7c3QchOhOhjVDuJuFC1HDFOWEIu+2APk+Lujz2Yj4e8ZPFTxAERKD5E6TleyIk2y//VRB4ZSBG+5vOz7UFr2AGvE/0+BxXL2Z/aDjqq3u0p9IiBQVecvSJA0EtjLyhMf0GebFaFUCfso/g== Received: from PH8PR07CA0022.namprd07.prod.outlook.com (2603:10b6:510:2cd::21) by IA1PR12MB8287.namprd12.prod.outlook.com (2603:10b6:208:3f5::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6678.24; Tue, 15 Aug 2023 02:34:23 +0000 Received: from SA2PEPF000015C6.namprd03.prod.outlook.com (2603:10b6:510:2cd:cafe::e8) by PH8PR07CA0022.outlook.office365.com (2603:10b6:510:2cd::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6652.33 via Frontend Transport; Tue, 15 Aug 2023 02:34:22 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.160) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by SA2PEPF000015C6.mail.protection.outlook.com (10.167.241.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6699.12 via Frontend Transport; Tue, 15 Aug 2023 02:34:22 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.5; Mon, 14 Aug 2023 19:34:11 -0700 Received: from [10.110.48.28] (10.126.230.37) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.37; Mon, 14 Aug 2023 19:34:10 -0700 Message-ID: <4271b91c-90b7-4b48-b761-b4535b2ae9b7@nvidia.com> Date: Mon, 14 Aug 2023 19:34:09 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v2 0/5] Reduce NUMA balance caused TLB-shootdowns in a VM Content-Language: en-US To: Yan Zhao CC: David Hildenbrand , , , , , , , , , , , , Mel Gorman References: <20230810085636.25914-1-yan.y.zhao@intel.com> <41a893e1-f2e7-23f4-cad2-d5c353a336a3@redhat.com> <6b48a161-257b-a02b-c483-87c04b655635@redhat.com> <1ad2c33d-95e1-49ec-acd2-ac02b506974e@nvidia.com> <846e9117-1f79-a5e0-1b14-3dba91ab8033@redhat.com> From: John Hubbard In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.126.230.37] X-ClientProxiedBy: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015C6:EE_|IA1PR12MB8287:EE_ X-MS-Office365-Filtering-Correlation-Id: b80839a0-0071-4697-f1c0-08db9d382297 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:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230028)(4636009)(346002)(396003)(376002)(136003)(39860400002)(82310400008)(451199021)(186006)(1800799006)(40470700004)(46966006)(36840700001)(36756003)(5660300002)(7416002)(2906002)(31696002)(86362001)(4744005)(31686004)(40460700003)(40480700001)(83380400001)(36860700001)(6916009)(70206006)(4326008)(54906003)(70586007)(41300700001)(16576012)(316002)(426003)(16526019)(26005)(2616005)(336012)(47076005)(53546011)(8936002)(8676002)(478600001)(356005)(82740400003)(7636003)(43740500002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Aug 2023 02:34:22.5763 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b80839a0-0071-4697-f1c0-08db9d382297 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015C6.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8287 X-Rspamd-Queue-Id: 0EB3620014 X-Rspam-User: X-Stat-Signature: 5ngsisxn3to4f1qss4poqheoc1u7s8g4 X-Rspamd-Server: rspam03 X-HE-Tag: 1692066864-197136 X-HE-Meta: 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 CSHsG8gF bYr+omIiZ5NT+0Iq+O5tlBpcVke6/rJtymDUn4IdfcM8mUWnkAw8bAWsk6IfJHJprhbJrmupC1h7OERG0k+l/xBlvUH1Sk5JMEw7qAZVivLKHK7YAvgCAd1xwebzMb42WGnyYbBQjFxW3+ntoicj34swSP2zZpyxSPapyoRExcHj9W29rSPBlHFO6yk36VPZeljFtc9I1dz6zu28fiRTSZOLYxkCBrNqlbUSfY42okuAVVYyKEQCzspuL7dDrU6aYkAKuuu/AWL2f045DsLcpBh6YkK/5eHKQ63Kjmzn9rn+3uYKPieMibX8ai5ZtelnG4TP4KeB44N4/gl0Rh7BDsio9sw== 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 8/14/23 02:09, Yan Zhao wrote: ... >> hmm_range_fault()-based memory management in particular might benefit >> from having NUMA balancing disabled entirely for the memremap_pages() >> region, come to think of it. That seems relatively easy and clean at >> first glance anyway. >> >> For other regions (allocated by the device driver), a per-VMA flag >> seems about right: VM_NO_NUMA_BALANCING ? >> > Thanks a lot for those good suggestions! > For VMs, when could a per-VMA flag be set? > Might be hard in mmap() in QEMU because a VMA may not be used for DMA until > after it's mapped into VFIO. > Then, should VFIO set this flag on after it maps a range? > Could this flag be unset after device hot-unplug? > I'm hoping someone who thinks about VMs and VFIO often can chime in. thanks, -- John Hubbard NVIDIA