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Wed, 16 Apr 2025 19:02:16 +0000 Message-ID: Date: Wed, 16 Apr 2025 12:02:12 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 14/26] x86/resctrl: Add the functionality to assign MBM events To: , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <22889d46484b2393d701ce83c82f253c1454216b.1743725907.git.babu.moger@amd.com> <59fbd325-04e8-459f-a724-ae0c4536b1a5@intel.com> <3d31259c-cac0-4b96-883c-6d2e8e427988@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0289.namprd04.prod.outlook.com (2603:10b6:303:89::24) 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_|CH3PR11MB7794:EE_ X-MS-Office365-Filtering-Correlation-Id: 21139037-0059-4085-af9e-08dd7d19343e 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|7416014|1800799024|376014|366016; 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Multiple counter-ids can be assigned to RMID, event pair. >> >> oh, are you referring to the assignments of different counters across multiple >> domains? > > May be I am confusing you here. This is what I meant. > > Here is one example. > > In a same group, "same group" means single RMID, eg. RMID_A > Configure cntr_id 0, to count reads only (This maps to total event). This will be one event, event0, so one counter assigned to RMID_A, event0 pair. > Configure cntr_id 1, to count write only (This maps to local event). ... event1, one counter assigned to RMID_A, event1 pair, ... > Configure cntr_id 2, to count dirty victims. ... event2, one counter assigned to RMID_A, event2 pair, ... > so on.. > so on.. > Configure cntr_id 31, to count remote read only. ... and event31, one counter assigned to RMID_A, event31 pair. The example reflects that a *single* counter can be assigned to an RMID, event pair. Considering above, perhaps changelog can start with something like: mbm_cntr_assign mode offers "num_mbm_cntrs" number of counters that can be assigned to RMID, event pairs .... > > We have 32 counter ids in a domain. Basically, we can configure all the > counters in a domain to just one group if you want to. Understood. > > We cannot do that right now because our data structures cannot do that. > We can only configure 2 events(local and total) right now. > > My understanding it is same with MPAM also. Reinette