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Tue, 22 Jul 2025 23:28:20 +0000 Message-ID: <791ff5e0-dcd8-4bfc-810c-b085bc4ca543@intel.com> Date: Tue, 22 Jul 2025 16:28:17 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v15 24/34] fs/resctrl: Report 'Unassigned' for MBM events in mbm_event mode To: , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <296c435e9bf63fc5031114cced00fbb4837ad327.1752013061.git.babu.moger@amd.com> <4b5eef45-9110-47f7-8e1b-a59028d66c52@intel.com> <1a7e2a89-4006-4180-88c6-aa7cad76fba1@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <1a7e2a89-4006-4180-88c6-aa7cad76fba1@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0104.namprd03.prod.outlook.com (2603:10b6:303:b7::19) 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_|PH3PPF496D5EAB2:EE_ X-MS-Office365-Filtering-Correlation-Id: 2fbc5408-36f7-48f8-3e0f-08ddc97771e7 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|376014|7416014|366016|1800799024|7053199007; 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These are named "mon_sub_L3_YY" >>> where "YY" is the node number. >>> >>> + The "mbm_event" counter assignment mode offers "num_mbm_cntrs" number of >>> + counters and allows users to assign counters to mon_hw_id, event pairs >>> + enabling bandwidth monitoring for as long as the counter remains assigned. >>> + The hardware will continue tracking the assigned counter until the user >>> + manually unassigns it, ensuring that event data is not reset during this >>> + period. An MBM event returns 'Unassigned' when the event does not have >>> + a hardware counter assigned. >> >> Most of this duplicates the "mbm_event" description added in patch #10. It should just >> be sufficient to mention that this applies to "mbm_event" counter assignment mode >> and then user can look up the main description in the doc. >> >> The last sentence is related to this section and need an update to reflect behavior >> when a CTRL_MON event is read and it or some of the MON groups do not have >> counters assigned. The paragraph that precedes this does describe how the sum >> works so this can tie into that. > > Just added following text. > > When the 'mbm_event' counter assignment mode is enabled, reading Not sure how this will turn out ... if I understand correctly it follows a paragraph that already starts with "The "mbm_event" counter assignment mode offers ..." so there seems to be some redundancy. > an MBM event returns 'Unassigned' if no hardware counter is assigned How about "reading an MBM event" -> "reading an MBM of a MON group" to distinguish it from the text about CTRL_MON group that follows it? > 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. > Reinette