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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 SN1PEPF00036F3F.mail.protection.outlook.com (10.167.248.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8606.22 via Frontend Transport; Wed, 2 Apr 2025 17:43:11 +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 12:43:05 -0500 Message-ID: <7710c312-77da-4b8d-bb80-74598433ecd6@amd.com> Date: Wed, 2 Apr 2025 23:13:03 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] sched/numa: Add statistics of numa balance task migration and swap To: =?UTF-8?Q?Michal_Koutn=C3=BD?= , 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 References: <20250402010611.3204674-1-yu.c.chen@intel.com> Content-Language: en-US From: K Prateek Nayak In-Reply-To: Content-Type: text/plain; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Apr 2025 17:43:11.1749 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e735a72d-1eb7-4923-dc8f-08dd720dd652 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: SN1PEPF00036F3F.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4405 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 5F15240006 X-Stat-Signature: jtoyjd3io7bcaxeuw4rnwww1f7x1s9z3 X-Rspam-User: X-HE-Tag: 1743615795-95224 X-HE-Meta: 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 K3p29spv 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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: Hello Michal, On 4/2/2025 6:54 PM, Michal Koutný wrote: > Hello Chen. > > On Wed, Apr 02, 2025 at 09:06:11AM +0800, Chen Yu wrote: >> On system with NUMA balancing enabled, it is found that tracking >> the task activities due to NUMA balancing is helpful. > ... >> 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 > > Why is the field /proc/$pid/sched not enough? The /proc/$pid/sched accounting is only done when schedstats are enabled. memcg users might want to track it separately without relying on schedstats which also enables a bunch of other scheduler related stats collection adding more overheads. > > Also, you may want to update Documentation/admin-guide/cgroup-v2.rst > too. > > Thanks, > Michal -- Thanks and Regards, Prateek