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Wed, 3 Sep 2025 03:01:41 +0000 Message-ID: <78e5640d-b290-4a9b-a410-c44290f14e0b@intel.com> Date: Tue, 2 Sep 2025 20:01:38 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v17 30/33] fs/resctrl: Disable BMEC event configuration when mbm_event mode is enabled To: Babu Moger , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , References: From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P220CA0022.NAMP220.PROD.OUTLOOK.COM (2603:10b6:303:115::27) 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_|DS0PR11MB7410:EE_ X-MS-Office365-Filtering-Correlation-Id: 8fe209c1-dbd2-4218-05f5-08ddea9634f4 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|1800799024|376014|7416014|7053199007; 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With BMEC the MBM events are configured > using the mbm_total_bytes_config or mbm_local_bytes_config files in > /sys/fs/resctrl/info/L3_MON/ and the per-domain event configuration affects > all monitor resource groups. > > The mbm_event counter assignment mode enables counters to be assigned to > RMID (i.e a monitor resource group), event pairs, with potentially unique > event configurations associated with every counter. > > There may be systems that support both BMEC and mbm_event counter > assignment mode, but resctrl supporting both concurrently will present a > conflicting interface to the user with both per-domain and per RMID, event > configurations active at the same time. > > The mbm_event counter assignment provides most flexibility to user space > and aligns with Arm's counter support. On systems that support both, > disable BMEC event configuration when mbm_event mode is enabled by hiding > the mbm_total_bytes_config or mbm_local_bytes_config files when mbm_event > mode is enabled. Ensure mon_features always displays accurate information > about monitor features. > > Suggested-by: Reinette Chatre > Signed-off-by: Babu Moger > --- Reviewed-by: Reinette Chatre Reinette