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Thu, 6 Nov 2025 00:09:31 +0000 Message-ID: <3bf7f52c-80e2-470a-9225-36077a37d7d0@intel.com> Date: Wed, 5 Nov 2025 16:09:28 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 12/32] x86,fs/resctrl: Support binary fixed point event counters To: "Luck, Tony" , Dave Martin CC: Fenghua Yu , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , "Drew Fustini" , Chen Yu , , , References: <20251029162118.40604-1-tony.luck@intel.com> <20251029162118.40604-13-tony.luck@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: MW4P222CA0022.NAMP222.PROD.OUTLOOK.COM (2603:10b6:303:114::27) 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_|DM4PR11MB6168:EE_ X-MS-Office365-Filtering-Correlation-Id: 84bc8cfd-9be1-4756-5e6e-08de1cc8c234 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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Nothing floats. > > You are right. I can change from is_floating_point to is_fixed_point. > This is a fs property though, not hardware, and highlights that the value is displayed in floating point format which is the closest resctrl has to establish a "contract" with user space on what format user space can expect when reading the data as backed with a matching update to resctrl.rst for the events that have this hardcoded by the fs. Whether an architecture uses fixed point format or some other mechanism to determine the value eventually exposed to user space is unique to the architecture. Reinette