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Tue, 11 Aug 2026 23:51:19 +0000 Message-ID: <0cc07711-3d81-4785-81dc-804178fb443c@intel.com> Date: Tue, 11 Aug 2026 16:51:15 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [RESEND PATCH v4 03/15] x86/resctrl: Add data structures and definitions for PLZA configuration To: Babu Moger , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: From: Reinette Chatre Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR04CA0250.namprd04.prod.outlook.com (2603:10b6:303:88::15) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) 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: SJ2PR11MB8370:EE_|LV4PR11MB9489:EE_ X-MS-Office365-Filtering-Correlation-Id: c7ace400-bcc2-4839-3925-08def80370b9 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014|23010399003|6133799003|10067099003|4143699003|11063799006|56012099006|22082099003|18002099003; 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The CLOSID/RMID association is programmed per CPU via >> >> CLOSID is also optional, no? I am not able to recall now why this is not made >> optional in this implementation though. Could you please remind me and add >> it to the changelog for next time? > > > Yes, CLOSID is optional as well. Since PLZA was primarily focused on > allocation, I hadn't considered that use case initially. However, > there may be scenarios where a user wants to monitor kernel activity > without affecting or changing the existing allocation configuration. > That would introduce an additional operating mode(See below). ok. I think doing so will simplify supporting the different modes across systems that may not support allocation or monitoring. > INHERIT_CTRL_AND_MON: > Kernel work inherits the allocation and monitoring from the user space > task. On x86 this means that kernel work shares the same CLOSID and > RMID as the user space task. This matches today's resctrl behavior. > > GLOBAL_ASSIGN_CTRL_INHERIT_MON_PER_CPU: > Kernel work uses a globally assigned allocation while monitoring is > inherited from the user space task. On x86 this means a CLOSID is > assigned for kernel work and the RMID is inherited from the user space > task. Default scope is all online CPUs; a subset may be selected via > the resctrl group interface. A CTRL_MON group is bound to this mode. > > GLOBAL_ASSIGN_CTRL_ASSIGN_MON_PER_CPU: > Kernel work uses globally assigned allocation and monitoring. On x86 > this means both CLOSID and RMID are assigned for kernel work. Default > scope is all online CPUs; a subset may be selected via the resctrl > group interface. A CTRL_MON or MON group is bound to this mode. > > GLOBAL_INHERIT_CTRL_ASSIGN_MON_PER_CPU:   <--- New mode > Kernel work inherits the allocation from user task and monitoring is > globally assigned for kernel work. On x86 this means that kernel > work shares the same CLOSID as user task and kernel work user > globally assigned RMID. A MON group is bound to this mode. I provided comments about this text in following patch. Apart from that, I think a CTRL_MON or MON group could be assigned to this mode? Thank you. Reinette