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Sat, 4 Oct 2025 00:10:37 +0000 Message-ID: <49d86b88-f785-4540-9806-b5d635e2b618@intel.com> Date: Fri, 3 Oct 2025 17:10:35 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 25/31] fs,x86/resctrl: Compute number of RMIDs as minimum across resources To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu CC: , , References: <20250925200328.64155-1-tony.luck@intel.com> <20250925200328.64155-26-tony.luck@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20250925200328.64155-26-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0221.namprd04.prod.outlook.com (2603:10b6:303:87::16) 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_|SA1PR11MB6735:EE_ X-MS-Office365-Filtering-Correlation-Id: d7611456-a747-48ff-aac8-08de02da71c4 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; 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On 9/25/25 1:03 PM, Tony Luck wrote: > resctrl assumes that only the L3 resource supports monitor events, so > it simply takes the rdt_resource::num_rmid from RDT_RESOURCE_L3 as > the system's number of RMIDs. > > The addition of telemetry events in a different resource breaks that > assumption. > > Compute the number of available RMIDs as the minimum value across > all mon_capable resources (analogous to how the number of CLOSIDs > is computed across alloc_capable resources). > > Note that mount time enumeration of the telemetry resource means that > this number can be reduced. If this happens, then some memory will > be wasted as the allocations for rdt_l3_mon_domain::mbm_states[] and > rdt_l3_mon_domain::rmid_busy_llc created during resctrl initialization > will be larger than needed. > > Signed-off-by: Tony Luck > --- | Reviewed-by: Reinette Chatre Reinette