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Thu, 3 Apr 2025 02:52:19 +0000 Message-ID: <1922ee95-cecd-43c6-8396-18ad952ba6b9@intel.com> Date: Thu, 3 Apr 2025 10:52:05 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] sched/numa: Add statistics of numa balance task migration and swap To: Madadi Vineeth Reddy CC: Peter Zijlstra , Ingo Molnar , Juri Lelli , Vincent Guittot , Mel Gorman , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , "Muchun Song" , Andrew Morton , "Tim Chen" , Aubrey Li , Rik van Riel , Raghavendra K T , K Prateek Nayak , Baolin Wang , "Xunlei Pang" , , , , Chen Yu References: <20250402010611.3204674-1-yu.c.chen@intel.com> <44b7d213-cca6-45d6-a48a-a3f358e7bca3@linux.ibm.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <44b7d213-cca6-45d6-a48a-a3f358e7bca3@linux.ibm.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SI2PR01CA0045.apcprd01.prod.exchangelabs.com (2603:1096:4:193::19) 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: 5b75e034-ed78-4149-552a-08dd725a8c97 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024|7053199007; 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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 > > I was able to see the fields and their corresponding values for schbench: > > numa_task_swapped : 2 > numa_task_migrated : 0 > numa_task_swapped : 1 > numa_task_migrated : 0 > numa_task_swapped : 0 > numa_task_migrated : 0 > numa_task_swapped : 1 > > Tested-by: Madadi Vineeth Reddy > Yes, the sysfs schedstat has to be enabled. Thanks for your test, Madadi! thanks, Chenyu > Thanks, > Madadi Vineeth Reddy > >> 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 >> --- >> RFC->v1: Rename the nr_numa_task_migrated to >> numa_task_migrated, and nr_numa_task_swapped >> numa_task_swapped in /proc/{PID}/sched, >> so both cgroup's memory.stat and task's >> sched have the same field name. >> --- >> include/linux/sched.h | 4 ++++ >> include/linux/vm_event_item.h | 2 ++ >> kernel/sched/core.c | 10 ++++++++-- >> kernel/sched/debug.c | 4 ++++ >> mm/memcontrol.c | 2 ++ >> mm/vmstat.c | 2 ++ >> 6 files changed, 22 insertions(+), 2 deletions(-)