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Fri, 19 Dec 2025 14:41:45 +0000 Message-ID: Date: Fri, 19 Dec 2025 22:41:28 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 21/23] -- DO NOT APPLY!!! -- sched/cache/stats: Add schedstat for cache aware load balancing To: Yangyu Chen , Tim Chen CC: Peter Zijlstra , Ingo Molnar , "K Prateek Nayak" , "Gautham R . Shenoy" , Vincent Guittot , "Juri Lelli" , Dietmar Eggemann , Steven Rostedt , Ben Segall , "Mel Gorman" , Valentin Schneider , "Madadi Vineeth Reddy" , Hillf Danton , Shrikanth Hegde , Jianyong Wu , Tingyin Duan , Vern Hao , Vern Hao , Len Brown , Aubrey Li , Zhao Liu , Chen Yu , Adam Li , Aaron Lu , Tim Chen , References: <71b94a7547f7843230270e20b84ecb0a540ab604.1764801860.git.tim.c.chen@linux.intel.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: KUZPR02CA0028.apcprd02.prod.outlook.com (2603:1096:d10:31::16) 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_|SA1PR11MB5924:EE_ X-MS-Office365-Filtering-Correlation-Id: faf5747f-41d0-4d01-e985-08de3f0cbb7b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|366016|376014; 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For instance, if users want to >> verify metrics like the number of exceeding RSS and nr_running limits, they >> can filter the output of /sys/kernel/debug/sched/debug and compute the required >> statistics manually: >> >> llc_exceed_cap SUM: 6 >> llc_exceed_nr SUM: 4531 >> >> Furthermore, these statistics exposed in /proc/schedstats can be queried manually >> or via perf sched stats[1] with minor modifications. >> > > Hi Tim, > > This patch looks great, especially for multithread Verilator workloads > on clustered LLC (like AMD EPYC). I'm discussing with Verilator > upstream to disable automatic userspace affinity assignment in > Verilator if such feature exist [1]. During the discussion, I think > there should be a way for userspace software to detect if such a > feature exists. Could we expose it in `/proc/schedstats` to allow > userspace software to detect such a feature? We can just use this > patch and remove the "DO NOT APPLY" tag. > Thanks for the test Yangyu. Does /sys/kernel/debug/sched/llc_enabled work for you? Anyway we can try to include /proc/schedstats as the formal one in the next version. Thanks, Chenyu > [1] https://github.com/verilator/verilator/issues/6826#issuecomment-3671287551 > > Thanks, > Yangyu Chen > >