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Wed, 3 Sep 2025 03:11:58 +0000 Message-ID: <29743495-f16f-4844-9121-49b510390cea@intel.com> Date: Tue, 2 Sep 2025 20:11:55 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v17 31/33] fs/resctrl: Introduce the interface to switch between monitor modes To: Babu Moger , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <68e9c17c6439f46fb4535cb2b89b380420645db1.1755224735.git.babu.moger@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <68e9c17c6439f46fb4535cb2b89b380420645db1.1755224735.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0056.namprd03.prod.outlook.com (2603:10b6:303:8e::31) 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_|IA4PR11MB9131:EE_ X-MS-Office365-Filtering-Correlation-Id: dc5b32ee-8ad7-479d-6836-08ddea97a4e3 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|1800799024|376014|7416014|366016|7053199007; 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In mbm_event mode, monitoring event can only accumulate data > while it is backed by a hardware counter. In "default" mode, resctrl > assumes there is a hardware counter for each event within every CTRL_MON > and MON group. > > Introduce mbm_assign_mode resctrl file to switch between mbm_event and > default modes. > > Example: > To list the MBM monitor modes supported: > $ cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > [mbm_event] > default > > To enable the "mbm_event" counter assignment mode: > $ echo "mbm_event" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > > To enable the "default" monitoring mode: > $ echo "default" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > > MBM event counters are automatically reset as part of changing the mode. Needs imperative, eg.: "Reset MBM event counters automatically ..." > Clear both architectural and non-architectural event states to prevent > overflow conditions during the next event read. Clear assignable counter > configuration on all the domains. Also, enable auto assignment when > switching to "mbm_event" mode. > > Signed-off-by: Babu Moger > --- | Reviewed-by: Reinette Chatre Reinette