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Thu, 6 Feb 2025 18:04:09 +0000 Message-ID: <5e911112-55f5-4b43-99f3-1dc11077da9c@intel.com> Date: Thu, 6 Feb 2025 10:04:06 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 18/23] x86/resctrl: Report "Unassigned" for MBM events in mbm_cntr_assign mode To: Babu Moger , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , References: <22cdafb381295c3802388613686d7b89a5e313c6.1737577229.git.babu.moger@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <22cdafb381295c3802388613686d7b89a5e313c6.1737577229.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P221CA0022.NAMP221.PROD.OUTLOOK.COM (2603:10b6:303:8b::27) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|CH3PR11MB8702:EE_ X-MS-Office365-Filtering-Correlation-Id: 0d10ae51-ecbb-4101-bf99-08dd46d8a761 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|7416014|376014|1800799024|7053199007; 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These are named "mon_sub_L3_YY" > where "YY" is the node number. > > + When supported the mbm_cntr_assign mode allows users to assign a Same comment as previous version. > + counter to mon_hw_id, event pair enabling bandwidth monitoring for > + as long as the counter remains assigned. The hardware will continue > + tracking the assigned mon_hw_id until the user manually unassigns > + it, ensuring that counters are not reset during this period. With > + a limited number of counters, the system may run out of assignable > + counters. In that case, MBM event counters will return 'Unassigned' > + when the event is read. Users must manually assign a counter to read > + the events. > + > "mon_hw_id": > Available only with debug option. The identifier used by hardware > for the monitor group. On x86 this is the RMID. Reinette