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Fri, 21 Aug 2026 16:10:04 +0000 Message-ID: <600c656c-4b62-4de1-ade0-149804e4494c@intel.com> Date: Fri, 21 Aug 2026 09:10:02 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 08/17] x86/resctrl: Enforce system RMID limit on AET event groups To: "Luck, Tony" CC: Fenghua Yu , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , "Drew Fustini" , Dave Martin , Chen Yu , David E Box , , Christoph Hellwig , , References: <20260729172752.11561-1-tony.luck@intel.com> <20260729172752.11561-9-tony.luck@intel.com> <779e9ca5-9785-4cfd-b6c8-42efa1b2f560@intel.com> <5ad0c32f-a734-4bae-b30b-791796e46009@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW3PR05CA0022.namprd05.prod.outlook.com (2603:10b6:303:2b::27) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB8370:EE_|SA1PR11MB5897:EE_ X-MS-Office365-Filtering-Correlation-Id: be980366-a1ab-42ba-5a8a-08deff9ea921 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|23010399003|376014|7416014|22082099003|18002099003|6133799003|56012099006|10067099003|11063799006|4143699003|5023799004; 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With >> the mon_capable/alloc_capable available, resctrl fs does not need any help from architecture >> to learn whether a resource is monitor or alloc capable, no? > > x86 and mpam versions of these currently use different iterator functions to walk over all > resources. But there is a file system version in so we > could do > > static inline bool resctrl_alloc_capable(void) > { > struct rdt_resource *r; > > for_each_rdt_resource(r) > if ((r)->alloc_capable) > return true; > return false; > } > > Ditto with s/alloc/mon/ for the matching partner, > > Would you like a patch to replace the arch versions woven into this series? > I see this as nice to have but I think it will require more planning than just weaving it into this series. As you highlight this change will span the architecture code and now there is also RISC-V to consider. I believe RISC-V is queued for inclusion but not yet merged and it handles its resctrl_arch_alloc_capable() helper differently. To me this thus looks more like a separate refactor that will span resctrl fs and all the architectures. If you find removing these helpers would help your AET dependency work then the answer is clear whether it should be done. If it is not required then I do not think it is reasonable to require this change as part of this AET work and I'll leave it up to you whether you want to take it on. Reinette