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Mon, 10 Feb 2025 18:08:23 +0000 Message-ID: <817b0c73-5898-4769-9356-a90435559f84@intel.com> Date: Mon, 10 Feb 2025 10:08:20 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 08/23] x86/resctrl: Introduce interface to display number of monitoring counters To: "Moger, Babu" , Babu Moger , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , References: <80457612b98078bd7786c73f83775e4de86c699e.1737577229.git.babu.moger@amd.com> <6376ea35-4ce7-4ac1-967b-97f2728228e3@intel.com> <11da060c-fb57-486f-bb8d-4ef830a2addb@amd.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: <11da060c-fb57-486f-bb8d-4ef830a2addb@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR03CA0117.namprd03.prod.outlook.com (2603:10b6:303:b7::32) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|PH7PR11MB6953:EE_ X-MS-Office365-Filtering-Correlation-Id: 0b900a07-bda7-4bc2-e603-08dd49fde8b4 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|1800799024|376014|7416014|366016|921020; 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Just added domain in the text. >> >> "The number of monitoring counters available in each domain for assignment when the system supports mbm_cntr_assign mode. >> :: >>    # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs >>    32 >> >> The resctrl file system supports tracking up to two memory bandwidth >> events per monitoring group: mbm_total_bytes and/or mbm_local_bytes. >> Up to two counters can be assigned per monitoring group, one for each >> memory bandwidth event in each domain. More monitoring groups can be tracked by assigning one counter per monitoring group. However, doing so limits memory bandwidth tracking to a single memory bandwidth event per >> monitoring group." > > Revised again: > > "The number of monitoring counters available in each domain for assignment when the system supports mbm_cntr_assign mode. For example, on a system with 32 monitoring counters: I think we need to be careful with "available" since all these counters may not be available. That is why "available_mbm_cntrs" exist. How about something like (please feel free to improve): "The maximum number of monitoring counters (total of available and assigned counters) in each domain when the system supports mbm_cntr_assign mode." Could you please make the "For example" a new paragraph (this follows existing style in the docs). It could also be made more specific, for example, "For example, on a system with 32 monitoring counters in each domain:" > :: >   # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs >   32 > The rest of the documentation seems like a repeat of what can be found in the "mbm_assign_mode" section right above it. It does not look as though any information will be lost by dropping the text below? > The resctrl file system supports tracking up to two memory bandwidth > events per monitoring group: mbm_total_bytes and/or mbm_local_bytes. > Up to two counters can be assigned per monitoring group, one for each > memory bandwidth event in each domain. More monitoring groups can be tracked by assigning one counter per monitoring group. However, doing so limits memory bandwidth tracking to a single memory bandwidth event per > monitoring group." > > Thanks > Babu Reinette