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Thu, 23 Oct 2025 17:46:52 +0000 Message-ID: <6869d7ee-d9b2-4460-8433-4473be566e95@intel.com> Date: Thu, 23 Oct 2025 10:46:51 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 22/31] x86,fs/resctrl: Handle domain creation/deletion for RDT_RESOURCE_PERF_PKG To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu CC: , , References: <20251013223348.103390-1-tony.luck@intel.com> <20251013223348.103390-23-tony.luck@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20251013223348.103390-23-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4P223CA0018.NAMP223.PROD.OUTLOOK.COM (2603:10b6:303:80::23) 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_|CH3PR11MB7323:EE_ X-MS-Office365-Filtering-Correlation-Id: 786247d0-2c39-46c8-e288-08de125c26a2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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There are per-domain > structures that hold the 64-bit values of counters, and elements to keep > track of the overflow and limbo threads. > > None of these are needed for the PERF_PKG resource. The hardware counters > are wide enough that they do not wrap around for decades. > > Define a new rdt_perf_pkg_mon_domain structure which just consists of the > standard rdt_domain_hdr to keep track of domain id and CPU mask. > > Update resctrl_online_mon_domain() for RDT_RESOURCE_PERF_PKG. The only action > needed for this resource is to create and populate domain directories if a > domain is added while resctrl is mounted. > > Similarly resctrl_offline_mon_domain() only needs to remove domain > directories. > > Signed-off-by: Tony Luck > --- Reviewed-by: Reinette Chatre Reinette