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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BN2PEPF000055DF.mail.protection.outlook.com (10.167.245.9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8632.2 via Frontend Transport; Wed, 2 Apr 2025 17:23:29 +0000 Received: from [172.31.188.187] (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 2 Apr 2025 12:23:23 -0500 Message-ID: <57f5803b-11e5-4b91-a4c3-9be191fbf8d3@amd.com> Date: Wed, 2 Apr 2025 22:53:21 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] sched/numa: Add statistics of numa balance task migration and swap To: <20250402010611.3204674-1-yu.c.chen@intel.com>, Chen Yu 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 , Baolin Wang , Xunlei Pang , , , , Chen Yu , "Madadi Vineeth Reddy" References: <20250402010611.3204674-1-yu.c.chen@intel.com> <3ba327b9-3020-4a63-9623-e6eea0120056@linux.ibm.com> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <3ba327b9-3020-4a63-9623-e6eea0120056@linux.ibm.com> Content-Type: text/plain; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Apr 2025 17:23:29.5512 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 576394aa-46a7-4af8-618c-08dd720b1602 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000055DF.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7742 X-Rspamd-Server: rspam01 X-Stat-Signature: ocoh3jxaxrcajjjq3499dhnb4ffa6u8e X-Rspam-User: X-Rspamd-Queue-Id: 1D0D940006 X-HE-Tag: 1743614612-493242 X-HE-Meta: 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 aECFg/dO 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/2/2025 7:03 PM, Madadi Vineeth Reddy wrote: > Hi Chen Yu, > > On 02/04/25 06:36, Chen Yu wrote: >> On system with NUMA balancing enabled, it is found that tracking >> the task activities due to NUMA balancing is helpful. 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 applied this patch, but I still don't see the two new fields > in /proc/{PID}/sched. > > Am I missing any additional steps? You also need to enable schedstats: echo 1 > /proc/sys/kernel/sched_schedstats After that it should be visible: $ cat /proc/4030/sched sched-messaging (4030, #threads: 641) ------------------------------------------------------------------- se.exec_start : 283818.948537 ... nr_forced_migrations : 0 numa_task_migrated : 0 numa_task_swapped : 0 nr_wakeups : 0 ... -- Thanks and Regards, Prateek > > 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(-) > >