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charset=UTF-8 Date: Thu, 25 Jun 2026 15:27:57 -0400 Message-Id: Subject: Re: [PATCH v11 2/4] mm/page_owner: add NUMA node filter Cc: , , , , , , To: "Zhen Ni" , From: "Zi Yan" X-Mailer: aerc 0.21.0 References: <20260625043101.338794-1-zhen.ni@easystack.cn> <20260625043101.338794-3-zhen.ni@easystack.cn> In-Reply-To: <20260625043101.338794-3-zhen.ni@easystack.cn> X-ClientProxiedBy: YQZPR01CA0186.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:8b::6) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|PH7PR12MB5781:EE_ X-MS-Office365-Filtering-Correlation-Id: fbe86651-0b56-4d7b-38a0-08ded2efdda5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|23010399003|376014|18002099003|22082099003|3023799007|11063799006|4143699003|56012099006|6133799003; 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This is useful for NUMA-aware memory > allocation analysis and debugging. > > The filter supports flexible input formats: > - Single node: nid=3D0 > - Multiple nodes: nid=3D0,2,3 > - Node range: nid=3D0-3 > - Mixed format: nid=3D0,2-4,7 > > Example usage: > # Using the page_owner_filter tool (recommended) > ./page_owner_filter -n 0-3 > ./page_owner_filter -m stack_handle -n 0,2-4,7 > > The implementation uses per-file-descriptor filter state stored in > file->private_data, allowing each opener to have independent filter > configuration. It uses nodemask_t for efficient multi-node filtering and > nodelist_parse() for flexible input parsing. Node validity is verified > using nodes_subset() to reject nodes without memory. > > Signed-off-by: Zhen Ni > --- > =20 > /* > * Maximum input length for filter commands: > - * 32: print_mode command max length is 17 ("mode=3Dstack_handle"). > + * - 32: print_mode command max length is 17 ("mode=3Dstack_handle") > + * with sufficient buffer > + * - 6 * MAX_NUMNODES: worst case for nid list > + * Worst case per node: ",NNNNN" (comma + 5-digit node number) =3D 6 = bytes > */ > - max_input_len =3D 32; > + max_input_len =3D 32 + 6 * MAX_NUMNODES; > =20 > if (count > max_input_len) > return -EINVAL; Hi Andrew, This needs to be fixed as well. --=20 Best Regards, Yan, Zi