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Mon, 21 Jul 2025 11:24:08 +0000 Message-ID: <36eb3d2e-03f3-4829-b0f6-94b0f3371629@intel.com> Date: Mon, 21 Jul 2025 19:23:59 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] sched/rt: Split cpupri_vec->cpumask to per NUMA node to reduce contention To: Pan Deng CC: , , , , References: <3755b9d2bf78da2ae593a9c92d8e79dddcaa9877.1751852370.git.pan.deng@intel.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <3755b9d2bf78da2ae593a9c92d8e79dddcaa9877.1751852370.git.pan.deng@intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SG2PR02CA0006.apcprd02.prod.outlook.com (2603:1096:3:17::18) 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_|DS0PR11MB8083:EE_ X-MS-Office365-Filtering-Correlation-Id: 581c13c8-9e5b-4928-64af-08ddc8491bc6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014; 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Sub-threads use RT priority 99 > with FIFO scheduling. FPS is used as score. > > perf c2c tool reveals: > cpumask (bitmap) cache line of `cpupri_vec->mask`: > - bits are loaded during cpupri_find > - bits are stored during cpupri_set > - cycles per load: ~2.2K to 8.7K > > This change splits `cpupri_vec->cpumask` into per-NUMA-node data to > mitigate false sharing. > > As a result: > - FPS improves by ~3.8% > - Kernel cycles% drops from ~20% to ~18.7% > - Cache line contention is mitigated, perf-c2c shows cycles per load > drops from ~2.2K-8.7K to ~0.5K-2.2K > This brings noticeable improvement for RT workload, and it would be even more convincing if we can have try on normal task workload, at least not bring regression(schbench/hackbenc, etc). thanks, Chenyu > Note: CONFIG_CPUMASK_OFFSTACK=n remains unchanged. >