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Tue, 13 Oct 2026 10:05:19 +0000 Message-ID: <51744944-51c2-4989-8ca8-41a8c53ed1e2@intel.com> Date: Tue, 13 Oct 2026 18:05:08 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/4] powerpc/topology: Introduce llc_override debugfs To: Tim Chen , Shrikanth Hegde CC: , , , , , , , , , , , References: <20261012102037.2477378-1-sshegde@linux.ibm.com> <0cbd60fcf328ffcb317739f60d327da3af6145f1.camel@linux.intel.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <0cbd60fcf328ffcb317739f60d327da3af6145f1.camel@linux.intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: KU0P306CA0042.MYSP306.PROD.OUTLOOK.COM (2603:1096:d10:29::9) To DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) 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: DM4PR11MB6020:EE_|SA0PR11MB4653:EE_ X-MS-Office365-Filtering-Correlation-Id: 9f00e8ef-5230-4b88-e2b8-08df29117cba X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024|23010399003|4143699003|11063799006|56012099006|18002099003|22082099003|10067099003; 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We validate mostly with workloads such as > hackbench, schbench and yogini (which can vary the number of threads > over time and track CPU assignment). I agree they are not ideal for > functional checks of the load balance path. > >> per-LLC occupancy in /proc/{PID}/schedstat may not tell the full >> story when there are multiple processes and multiple LLC's. >> >> Atleast for functional verification, we might need one if there is >> not one already. The reason being, >> - At present, we may need a custom workload. hackbench/schbench are >> wakeup intensive and typically bail out even before load balance. >> - stress-ng is per process. So doesn't get cache aware scheduling. >> - A selftest could spwan specific number of threads till llc size etc >> and ensure packing happens till core_count(llc_size) by default. >> This could also be used for tunable verfifications. >> - Provide an ability to observe how much of the workload was contained >> within the LLC due to cache aware scheduling or number of load >> balances stopped due to preferred llc. > > A selftest would be great and much welcomed. > Yes, that would be very useful. For functional testing, previously we asked AI to generate a trial test script to launch a random number of while(1) tests and watch their occupancy on each LLC. thanks, Chenyu