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Tue, 1 Apr 2025 00:13:28 +0000 Message-ID: Date: Mon, 31 Mar 2025 17:13:26 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 09/16] x86/resctrl: Add detailed descriptions for Clearwater Forest events To: "Luck, Tony" CC: Fenghua Yu , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , "Drew Fustini" , Dave Martin , , References: <20250321231609.57418-1-tony.luck@intel.com> <20250321231609.57418-10-tony.luck@intel.com> <03f00372-e863-4405-a077-86173e39368c@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW2PR16CA0057.namprd16.prod.outlook.com (2603:10b6:907:1::34) 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_|SJ2PR11MB7503:EE_ X-MS-Office365-Filtering-Correlation-Id: 58fd351f-44ba-4c2c-2092-08dd70b20755 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; 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What will happen when >> a new system using the same event layout arrives? Will the url >> above be duplicated for this new system's acronym and contain >> duplicate data? How will the resctrl support change? If I understand >> correctly resctrl will not need to be changed but instead the "CWF" >> events will just automatically be used for this new hypothetical >> system? This makes me think that this should not be so CWF specific. > > I was told that we might expect to see new guid values to describe > different event register layouts for the same CPU model. The event > aggregators are all firmware driven. So a BIOS update could make changes. Sounds like this supports my point. Naming these data structures based on the CPU would create naming challenges when this scenario arrives, no? > > So I've left open the option to add additional structure defintions for > Clearwater Forest with some future firmware update. Why not use the guid as part of the naming to make clear that CPU model does not dictate the layout? > > If a future processor uses the exact same layout with the same guid value, > then no Linux update would be needed. We'd just have the slight oddity > that a structure named "cwf_*" would match and be used. > > Next system to implement these telemetry events has a very different > list of supported events. > Reinette