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Mon, 8 Jun 2026 23:26:38 +0000 Message-ID: <4121f521-830d-4483-9305-efa31cef0f3f@intel.com> Date: Mon, 8 Jun 2026 16:26:36 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 14/14] Documentation/filesystems/resctrl: Add footnote for telemetry fstab mount caveat To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu , David E Box , CC: Christoph Hellwig , , References: <20260601195632.15876-1-tony.luck@intel.com> <20260601195632.15876-15-tony.luck@intel.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: <20260601195632.15876-15-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0061.namprd04.prod.outlook.com (2603:10b6:303:6b::6) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) 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: SJ2PR11MB8370:EE_|SA3PR11MB7581:EE_ X-MS-Office365-Filtering-Correlation-Id: 9f54f078-032b-46ac-b0da-08dec5b56355 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014|921020|11063799006|4143699003|3023799007|56012099006|22082099003|18002099003; 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Each directory contains files for the enabled > L3 events (e.g. "llc_occupancy", "mbm_total_bytes", and "mbm_local_bytes"). > > - If telemetry monitoring is enabled, there will be a "mon_PERF_PKG_YY" > + If telemetry monitoring is enabled [#]_, there will be a "mon_PERF_PKG_YY" > directory for each physical processor package. Each directory contains > files for the enabled telemetry events (e.g. "core_energy". "activity", > "uops_retired", etc.) > @@ -659,6 +659,11 @@ When monitoring is enabled all MON groups will also contain: > returned if the MBM event does not have an assigned counter in the > CTRL_MON group nor in any of its associated MON groups. > > +.. [#] Telemetry features are enumerated asynchronously by the PMT driver. If > + resctrl is automatically mounted from ``/etc/fstab`` at boot, the telemetry > + features may not yet be available at mount time and will therefore not be > + enabled. Would it be helpful to add a snippet that explains that in this scenario telemetry features could be enabled on resctrl remount? > + > "mon_hw_id": > Available only with debug option. The identifier used by hardware > for the monitor group. On x86 this is the RMID. Reinette