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Wed, 19 Feb 2025 21:56:30 +0000 Message-ID: <64d0552f-0015-496f-85d8-5a0b68cc69e0@intel.com> Date: Wed, 19 Feb 2025 13:56:27 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 06/42] x86/resctrl: Remove data_width and the tabular format To: James Morse , , CC: Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , Babu Moger , , "D Scott Phillips OS" , , , , , , Jamie Iles , Xin Hao , , , , David Hildenbrand , Rex Nie , "Dave Martin" , Koba Ko , Shanker Donthineni , Shaopeng Tan , "Tony Luck" References: <20250207181823.6378-1-james.morse@arm.com> <20250207181823.6378-7-james.morse@arm.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20250207181823.6378-7-james.morse@arm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0091.namprd03.prod.outlook.com (2603:10b6:303:b7::6) To SN7PR11MB7566.namprd11.prod.outlook.com (2603:10b6:806:34d::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: SN7PR11MB7566:EE_|IA1PR11MB6492:EE_ X-MS-Office365-Filtering-Correlation-Id: 6dc76f1d-93af-4b2d-64df-08dd5130443d X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|1800799024|7053199007; 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This is used to zero pad all control values in the schemata > file so they appear in columns. The same is done with the resource names > to complete the visual effect. e.g. > | SMBA:0=2048 > | L3:0=00ff > > AMD platforms discover their maximum bandwidth for the MB resource from > firmware, but hard-code the data_width to 4. If the maximum bandwidth > requires more digits - the tabular format is silently broken. > This is also broken when the mba_MBps mount option is used as the > field width isn't updated. If new schema are added resctrl will need > to be able to determine the maximum width. The benefit of this > pretty-printing is questionable. > > Instead of handling runtime discovery of the data_width for AMD platforms, > remove the feature. These fields are always zero padded so should be > harmless to remove if the whole field has been treated as a number. > In the above example, this would now look like this: > | SMBA:0=2048 > | L3:0=ff > > Signed-off-by: James Morse > Tested-by: Shaopeng Tan > Reviewed-by: Shaopeng Tan > Reviewed-by: Tony Luck > --- Reviewed-by: Reinette Chatre Reinette