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Wed, 3 Sep 2025 02:30:19 +0000 Message-ID: Date: Tue, 2 Sep 2025 19:30:15 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v17 10/33] fs/resctrl: Introduce the interface to display monitoring modes To: Babu Moger , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , References: Content-Language: en-US From: Reinette Chatre In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P220CA0020.NAMP220.PROD.OUTLOOK.COM (2603:10b6:303:115::25) 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_|SA3PR11MB8076:EE_ X-MS-Office365-Filtering-Correlation-Id: a1315476-f2c7-4e87-13c0-08ddea91d387 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|376014|366016|1800799024|7053199007; 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The hardware continues to track the assigned counter until it is > explicitly unassigned by the user. Each event within a resctrl group can be > assigned independently in this mode. > > On AMD systems "mbm_event" mode is backed by the ABMC (Assignable > Bandwidth Monitoring Counters) hardware feature and is enabled by default. > > The "default" mode is the existing mode that works without the explicit > counter assignment, instead relying on dynamic counter assignment by > hardware that may result in hardware not dedicating a counter resulting > in monitoring data reads returning "Unavailable". > > Provide an interface to display the monitor modes on the system. > > $ cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > [mbm_event] > default > > Add IS_ENABLED(CONFIG_RESCTRL_ASSIGN_FIXED) check to support Arm64. > > On x86, CONFIG_RESCTRL_ASSIGN_FIXED is not defined. On Arm64, it will be > defined when the "mbm_event" mode is supported. > > Add IS_ENABLED(CONFIG_RESCTRL_ASSIGN_FIXED) check early to ensure the user > interface remains compatible with upcoming Arm64 support. IS_ENABLED() > safely evaluates to 0 when the configuration is not defined. > > As a result, for MPAM, the display would be either: > [default] > or > [mbm_event] > > Signed-off-by: Babu Moger > --- Reviewed-by: Reinette Chatre Reinette