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Fri, 19 Dec 2025 18:28:34 +0000 Message-ID: <83cd3fe0-2dc6-4456-b845-4072b7ecb2a2@intel.com> Date: Fri, 19 Dec 2025 10:28:32 -0800 User-Agent: Mozilla Thunderbird From: Reinette Chatre Subject: Re: [PATCH v2 3/3] x86/resctrl: Add "*" shorthand to set minimum io_alloc CBM for all domains To: Aaron Tomlin , "Luck, Tony" CC: "Moger, Babu" , "Dave.Martin@arm.com" , "james.morse@arm.com" , "babu.moger@amd.com" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "sean@ashe.io" , "linux-kernel@vger.kernel.org" References: <20251215230257.1798865-1-atomlin@atomlin.com> <20251215230257.1798865-4-atomlin@atomlin.com> <95d219be-c89b-431a-974a-2e2b653f98e4@amd.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0038.namprd03.prod.outlook.com (2603:10b6:303:8e::13) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) 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: SJ2PR11MB7573:EE_|DS0PR11MB6541:EE_ X-MS-Office365-Filtering-Correlation-Id: 7ee1d6b9-3c1b-4a42-26a5-08de3f2c6b27 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024; 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I am in complete agreement with your assessment. The > primary intention behind limiting the scope to io_alloc was indeed to avoid > the complexities associated with L2 asymmetric domains. > > Are we all in alignment to focus this feature entirely on io_alloc for the > time being? If so, I will be pleased to prepare a follow-up series that >From my side I am ok to limit this to io_alloc. Of course, this does not prevent cache allocation from supporting this syntax in the future. Tony: did you perhaps imply with examples in [2] that '*' only be supported by L3 and MB, not L2? Can it be guaranteed that L3 will never be asymmetric? Not that it is a blocker though, as discussed earlier there are ways [3] to support '*' when domains may be asymmetric. That proposal is only reasonable if considering the feature as "let user set same CBM on all domains" that just happens to support the "reset to min" use case for L3 io_alloc. I assume even on asymmetric domains the min would be the same? If there is indeed a requirement to support "reset to defaults" for general cache allocation then this feature would not work for asymmetric domains as you highlighted in [4]. Although, a "reset to defaults" for cache allocation use case may be better handled by removing and recreating the resource group since the defaults will take into account any exclusive allocations? Reinette > reflects this consensus once our wider discussion has concluded. > >> >> [1] https://lore.kernel.org/lkml/SJ1PR11MB60833A27A1B8057CDDFB1B2BFCCFA@SJ1PR11MB6083.namprd11.prod.outlook.com/ [2] https://lore.kernel.org/all/SJ1PR11MB6083CCA2A7904E459B1AA35DFCA8A@SJ1PR11MB6083.namprd11.prod.outlook.com/ [3] https://lore.kernel.org/lkml/f4a043d2-9cb0-41c9-a45d-31f96fd007d5@amd.com/ [4] https://lore.kernel.org/lkml/SJ1PR11MB60836AB4270419338FBB4D1EFCCEA@SJ1PR11MB6083.namprd11.prod.outlook.com/