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Wed, 23 Jul 2025 02:05:46 +0000 Message-ID: <0fd87712-0a71-4f4b-8780-648099e708fa@intel.com> Date: Tue, 22 Jul 2025 19:05:43 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v15 24/34] fs/resctrl: Report 'Unassigned' for MBM events in mbm_event mode To: "Moger, Babu" , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <296c435e9bf63fc5031114cced00fbb4837ad327.1752013061.git.babu.moger@amd.com> <4b5eef45-9110-47f7-8e1b-a59028d66c52@intel.com> <1a7e2a89-4006-4180-88c6-aa7cad76fba1@amd.com> <791ff5e0-dcd8-4bfc-810c-b085bc4ca543@intel.com> <37f2b5b1-0e99-45dc-bba3-c8c22fb298cf@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <37f2b5b1-0e99-45dc-bba3-c8c22fb298cf@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR03CA0018.namprd03.prod.outlook.com (2603:10b6:303:8f::23) 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_|SA1PR11MB8373:EE_ X-MS-Office365-Filtering-Correlation-Id: 8035e2f0-70b9-477a-eae8-08ddc98d701c 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|376014|7416014|1800799024|921020; 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Users can look up about "mbm_event" from "mbm_assign_mode". Here is the complete diff. > > diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst > index 446736dbd97f..01c33f62ce74 100644 > --- a/Documentation/filesystems/resctrl.rst > +++ b/Documentation/filesystems/resctrl.rst > @@ -434,6 +434,12 @@ When monitoring is enabled all MON groups will also contain: >         for the L3 cache they occupy). These are named "mon_sub_L3_YY" >         where "YY" is the node number. > > +       When the 'mbm_event' counter assignment mode is enabled, reading > +       an MBM event of a MON group returns 'Unassigned' if no hardware > +       counter is assigned to it. For CTRL_MON groups, 'Unassigned' is > +       returned if none of the events in the CTRL_MON group or its > +       associated MON groups have assigned counters. The "none of the events" could be interpreted wrongly with only one MBM event being read. How about the last sentence as: For CTRL_MON groups, 'Unassigned' is returned if the MBM event does not have an assigned counter in the CTRL_MON group nor in any of its associated MON groups. Reinette