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Thu, 3 Apr 2025 02:49:43 +0000 Message-ID: Date: Thu, 3 Apr 2025 10:49:30 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] sched/numa: Add statistics of numa balance task migration and swap To: K Prateek Nayak , Peter Zijlstra , Ingo Molnar , Juri Lelli , Vincent Guittot , "Mel Gorman" , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton CC: Tim Chen , Aubrey Li , "Rik van Riel" , Raghavendra K T , "Baolin Wang" , Xunlei Pang , , , , Chen Yu References: <20250402010611.3204674-1-yu.c.chen@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: 8bit X-ClientProxiedBy: SG3P274CA0015.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:be::27) 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_|CYYPR11MB8357:EE_ X-MS-Office365-Filtering-Correlation-Id: 3a75ec14-c867-4f2d-3db6-08dd725a2f88 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024|7053199007|921020; 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NUMA balancing >> has two mechanisms for task migration: one is to migrate the task to >> an idle CPU in its preferred node, the other is to swap tasks on >> different nodes if they are on each other's preferred node. >> >> The kernel already has NUMA page migration statistics in >> /sys/fs/cgroup/mytest/memory.stat and /proc/{PID}/sched. >> but does not have statistics for task migration/swap. >> Add the task migration and swap count accordingly. >> >> The following two new fields: >> >> numa_task_migrated >> numa_task_swapped >> >> will be displayed in both >> /sys/fs/cgroup/{GROUP}/memory.stat and /proc/{PID}/sched > > Running sched-messaging with schedstats enabled, I could see both > "numa_task_migrated" and "numa_task_swapped" being populated for the > sched-messaging threads: > > $ for i in $(ls /proc/4030/task/); do grep "numa_task_migrated" /proc/ > $i/sched; done | tr -s ' ' | cut -d ' ' -f3 | sort | uniq -c >     400 0 >     231 1 >      10 2 > > $ for i in $(ls /proc/4030/task/); do grep "numa_task_swapped" /proc/$i/ > sched; done | tr -s ' ' | cut -d ' ' -f3 | sort | uniq -c >     389 0 >     193 1 >      47 2 >      11 3 >       1 4 > >> >> Previous RFC version can be found here: >> https://lore.kernel.org/ >> lkml/1847c5ef828ad4835a35e3a54b88d2e13bce0eea.1740483690.git.yu.c.chen@intel.com/ >> >> Signed-off-by: Chen Yu > > Feel free to add: > > Tested-by: K Prateek Nayak > Thanks Prateek! Thanks, Chenyu