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Wed, 10 Jun 2026 16:19:58 +0000 Date: Wed, 10 Jun 2026 09:19:56 -0700 From: "Luck, Tony" To: Reinette Chatre CC: Fenghua Yu , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , "Drew Fustini" , Dave Martin , Chen Yu , David E Box , , Christoph Hellwig , , Subject: Re: [PATCH v7 14/14] Documentation/filesystems/resctrl: Add footnote for telemetry fstab mount caveat Message-ID: References: <20260601195632.15876-1-tony.luck@intel.com> <20260601195632.15876-15-tony.luck@intel.com> <4121f521-830d-4483-9305-efa31cef0f3f@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <4121f521-830d-4483-9305-efa31cef0f3f@intel.com> X-ClientProxiedBy: BY3PR03CA0025.namprd03.prod.outlook.com (2603:10b6:a03:39a::30) To SJ1PR11MB6083.namprd11.prod.outlook.com (2603:10b6:a03:48a::9) 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: SJ1PR11MB6083:EE_|CY5PR11MB6258:EE_ X-MS-Office365-Filtering-Correlation-Id: 54ea1cb9-31d4-47cd-6b3d-08dec70c1d78 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|376014|366016|23010399003|18002099003|22082099003|3023799007|11063799006|56012099006|4143699003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?IfxiNSu1p2aI9T+zVWOUYEHoOisRE9ABEgim+0RlmQpPer+D9yuePAv0iA6+?= =?us-ascii?Q?GKI8MDcXWB5IN4HpiJepNL5qmDCHMZdTMJjzvGK3h8msuG9Ro4E4sa0cDsxi?= =?us-ascii?Q?KVD4xBmIZ8NIEmJvsTRebobOTFr6zBZUh1zYkBY4PgpMfwCTYRHc6Vio/r9S?= =?us-ascii?Q?g8JT23Kd1ZNc6eJLUARDGrQvkUOEk8kCVeiSVQMSKBdFqB3imo6fhqK3U/gF?= =?us-ascii?Q?80GI+8oAzeSlyy9ZoFspOT1OK6xusZ+cRy5epYeLNc2CntAj+g8IqKv+1nxZ?= =?us-ascii?Q?opovdPm+S5xr4R1fmZu7fuf2OHF0S8TEFteQxZPS0YxZ61J74hLBo1DwtAAP?= =?us-ascii?Q?ukCFuNw8tu9FOSrDJINqNAA0J1p5xEBzFgrBaAcfRlMS/iTX9a0uk9rHIW+l?= =?us-ascii?Q?BoCAEUtpA+TOpHT38Fq/17XhuXz3cijatgA07ksZqLRI9VBJUelXw+9nKgh8?= =?us-ascii?Q?lVYXKA0voeEomBcwGjnP3pF2nY/DKvkLj2cpnQ56YkCQfNVWngxGXVY4nr06?= =?us-ascii?Q?qOnaNEXDm67zvrIdXpQPXV1t9uSQxUM3ngPudlnqz99coXOKVVvs1JBQ5nrj?= =?us-ascii?Q?K7yqJwuQtEsJeiScraiPKn21y4PXpl3LnpbSzubCp8/aDgcQl3W41+srXIrx?= =?us-ascii?Q?D7JfJda3Pq7OgsYy6SZHz0ernryLsOlTtJ29hl6XcwLLVqIfBWvPSol5tgMi?= =?us-ascii?Q?m6Xn06IjYv8lGIv/5rsJu/A6l+PvOLU7pAPeOjBkGDS98KMYhZAfY1xKbvgV?= =?us-ascii?Q?CdoNQvyELmKkhVYZZYPsuMiLd37zwkkDLPeUr130ZRwp0yMLYXUC52W8bt0I?= =?us-ascii?Q?Xd2s4eJvbwIn0D+jlAjs2zdm370jjNV+b8elmvlPhF8tvp4PcdND6oDUw0c3?= =?us-ascii?Q?nXcpV5ZjEDSwjUXo1uKF0BnHhsxUXtdy1+az1P+2e3DB5oA0Oh+U4MHjV8Y9?= =?us-ascii?Q?s/dau82sOAZQAqNV2xjHK5v3Xm1bmPNSAhjGEJMEwcG1C0+/oQW8VRpclM6j?= =?us-ascii?Q?vMwbe6d/RJnN/A6uVdFtWl4MKJqgx93vUoH+7SvcltsXCZvB4fiYKGMWjKju?= =?us-ascii?Q?RRNpJsmCWGgHy0MNfb4WeFahn7SIclmke6cjg5EC403egB+uzFuieEgVqi7I?= =?us-ascii?Q?pCFgGR9BFGnRI1kT9N7YvQpKjLck3B+voL9G0yxKLWSo01xQTT3DvhNSiteu?= =?us-ascii?Q?TYl2MD+Sta+uv6EBGZyNnCKV6n0JVEDxP2sHGMsKbkVKOObDhBRqO3wVAbY3?= =?us-ascii?Q?qdOgcqHxAJsXTUulfD9zBOKhc2WzDP2ktOg3OwloT5zz1sNIGqOYsX/USPZt?= =?us-ascii?Q?72JUxgGiBCe7on5zg3+FAkVfSuli0KOLUw/FWhr8i7UfyaaMce3V5ohDjYgM?= =?us-ascii?Q?D+DbUgp/vSNAEEdO6EbYU/XqiAVNUYjkn7OobXwGGPH2LtGIV0Ufc5YWT58V?= =?us-ascii?Q?NNDGwRSkpgNLs9et+VoDR3lgdMgMws0Y98GYpIZ/LudWNiIEAl/csfjuB9Ux?= =?us-ascii?Q?jfWiGxAt//I0enul0tN8boIjEPFjq5+G7Y9fZVMbYPOoCY/bhN2isHwbWLMv?= =?us-ascii?Q?BQ9+qcLNIxTigKNBbVpCZcaZShIJHFIfuahY7m2iK1++2ylna7x1Hb3XHmhs?= =?us-ascii?Q?JUY9mDXRP9X1A99aJzyjj3afG05JyjKS+PYCzzQtsn2PIzOzOF5FYE8bLKoA?= =?us-ascii?Q?9xtJA8NbU+FAyUCRGDm04NFCDHRxWp+6MmJZZOBMCl84HFsQrPRq6X6lJtTY?= =?us-ascii?Q?vvoPcbYQEA=3D=3D?= X-Exchange-RoutingPolicyChecked: N0LzA4F3GEqCXhWj4wmL8ZW2SHEInwypL8RnMKmC7W1JaojnyI3ILH+ZZzQqfggjD7ZRsgzFiXun/KTjeTIUbjYzRaS6WWgd+pPGdJAgegq1Z5Gceu1DX8Odd8sQ/PniQgOBCFEZvKsUIUti4nZ5ZBmrXLRI0fEBu/Yc1p5ha2H/WgpT1AJgyaiL29RRNgTihdbpo/BUbWfeIdmv9p9q1n5yErYLNmjKjy6hOeHlCIU1+Aho+73s47CmMKdQBaX7zFgIOGH9j1mHt4AW6HDvgBG4eoH+PZwkK2+qTQikwUSJIWY+kesJ2KDz8FGUscQWp3E1XzNFXRaKyqLDlZ7aPA== X-MS-Exchange-CrossTenant-Network-Message-Id: 54ea1cb9-31d4-47cd-6b3d-08dec70c1d78 X-MS-Exchange-CrossTenant-AuthSource: SJ1PR11MB6083.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jun 2026 16:19:58.2412 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: iaDfBhjPTzYQq8LkjTxgEXAAay74VHFQUrF3ldfRA7zbZFHCciTN6arEIcHAVGmyVPj0k7ymNPr2WU3YqydMaw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR11MB6258 X-OriginatorOrg: intel.com On Mon, Jun 08, 2026 at 04:26:36PM -0700, Reinette Chatre wrote: > Hi Tony, > > On 6/1/26 12:56 PM, Tony Luck wrote: > > Add a footnote to the 'If telemetry monitoring is enabled' sentence noting > > that because PMT driver enumerates telemetry features asynchronously, an > > automatic mount of resctrl from /etc/fstab at boot may occur before those > > features are available, resulting in them not being enabled. > > > > Assisted-by: Claude:Sonnet_4.6 > > Signed-off-by: Tony Luck > > --- > > Documentation/filesystems/resctrl.rst | 7 ++++++- > > 1 file changed, 6 insertions(+), 1 deletion(-) > > > > diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst > > index b003bed339fd..4e62b8c5e0d6 100644 > > --- a/Documentation/filesystems/resctrl.rst > > +++ b/Documentation/filesystems/resctrl.rst > > @@ -620,7 +620,7 @@ When monitoring is enabled all MON groups will also contain: > > each instance of an L3 cache. 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? Yes. I will add. > > > + > > "mon_hw_id": > > Available only with debug option. The identifier used by hardware > > for the monitor group. On x86 this is the RMID. > > Reinette -Tony