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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: Hi Michal, thanks for taking a look at this, On 4/2/2025 9:24 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/$pid/sched not enough? > In the context of NUMA balancing, it would be helpful to not only monitor on the activities of individual task/thread but also the resource usage and task migrations at the group level - which helps us quickly evaluate the performance and resource usage of the container - like per memcg numa_pages_migrated, numa_pte_updates introduced in commit f77f0c751478 ("mm,memcg: provide per-cgroup counters for NUMA balancing operations"). Yes, we can iterate the /proc/$pid/sched to find the accumulated NUMA stat, and the introduction of per - cgroup numa stat can help users more conveniently track the overall data of the workload. Besides, I'm considering evaluating the per - cgroup NUMA balance control[1] to help users do fine - grain control per workload. This per - cgroup NUMA balance stat could be used to evaluate the efficiency of per - cgroup NUMA balance. > Also, you may want to update Documentation/admin-guide/cgroup-v2.rst > too. Got it, will do in next version. [1] https://lore.kernel.org/lkml/b3f1f6c478127a38b9091a8341374ba160d25c5a.1740483690.git.yu.c.chen@intel.com/ thanks, Chenyu > > Thanks, > Michal