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Thu, 13 Nov 2025 04:05:16 +0000 Message-ID: Date: Wed, 12 Nov 2025 20:05:14 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 15/32] fs/resctrl: Cleanup as L3 is no longer the only monitor resource To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu CC: , , References: <20251029162118.40604-1-tony.luck@intel.com> <20251029162118.40604-16-tony.luck@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20251029162118.40604-16-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BY5PR17CA0028.namprd17.prod.outlook.com (2603:10b6:a03:1b8::41) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|DM3PPF341F90799:EE_ X-MS-Office365-Filtering-Correlation-Id: 785b4265-a0ca-4979-4f5a-08de2269da2a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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How about something like: "fs/resctrl: Emphasize that L3 monitoring resource is required for summing domains" On 10/29/25 9:20 AM, Tony Luck wrote: > The feature to sum event data across multiple domains supports systems > with Sub-NUMA Cluster (SNC) mode enabled. The top-level monitoring files > in each "mon_L3_XX" directory provide the sum of data across all SNC > nodes sharing an L3 cache instance while the "mon_sub_L3_YY" sub-directories > provide the event data of the individual nodes. > > SNC is only associated with the L3 resource and domains and as a result > the flow handling the sum of event data implicitly assumes it is > working with the L3 resource and domains. > > Reading of telemetry events do not require to sum event data so this > feature can remain dedicated to SNC and keep the implicit assumption > of working with the L3 resource and domains. > > Add a WARN to where the implicit assumption of working with the L3 resource > is made and add comments on how the structure controlling the event sum > feature is used. > > Suggested-by: Reinette Chatre > Signed-off-by: Tony Luck > --- | Reviewed-by: Reinette Chatre Reinette