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Tue, 27 Oct 2026 16:21:59 +0000 Message-ID: Date: Tue, 27 Oct 2026 09:21:56 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 12/12] x86/resctrl: Add MMIO-based LLC occupancy monitoring support To: Chen Yu CC: , , , , , , , , , , , , "Hongyu Ning" References: <9e4fc1c8-c40d-45f3-8735-94d218168b8c@intel.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0262.namprd04.prod.outlook.com (2603:10b6:303:88::27) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB8370:EE_|CH3PR11MB8212:EE_ X-MS-Office365-Filtering-Correlation-Id: a6ef5115-5b03-43d1-24cc-08df34466cff X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|23010399003|366016|7416014|376014|261026140227099003|11063799006|4143699003|261021123027099003|56012099006|261022105027099003|10067099003|22082099003|18002099003|261026121527099003; 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Register the L3 occupancy event >>> with ERDT enabled when available, falling back to the MSR-based >>> path otherwise. >>> >>> Use the CMRC (Cache Monitoring Registers for CPU Agents Description) >>> ACPI sub-table to read LLC occupancy counters for each RMID via MMIO >>> when ERDT is enabled. >>> >>> Although the occupancy counters can now be read from any CPU via >>> MMIO, keep the per-domain limbo handler. A global handler would >>> still have to iterate over every domain and would save nr_domains - 1 >> >> Please write what "nr_domains - 1" means in English since as it is written >> it is not clear how this "does not justify maintaining two limbo handler >> models." >> > > OK, I'll rephrase it to a simpler version, how about this: > > Although the occupancy counters can now be read from any CPU via MMIO, > keep the per domain limbo handler. A single global handler would still > have to check the limbo RMIDs of every L3 domain, so it would do the same > amount of work. The only saving would be running one limbo worker instead > of one per L3 domain, which does not justify maintaining two limbo handler > models. ok. One nit, please let it start with "Keep the per domain limbo handler ...". Thank you. Reinette