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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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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