Re: [PATCH v2 2/3] sched/fair: Ignore isolated cpus in update_numa_stat

[Madadi Vineeth Reddy <vineethr@linux.ibm.com>]

On 03/01/25 12:29, Chuyi Zhou wrote:
> Now update_numa_stats() iterates each cpu in a node to gather load
> information for the node and attempts to find the idle cpu as a candidate
> best_cpu within the node.
> 
> In update_numa_stats() we should take into account the scheduling domain.
> This is because the "isolcpus" kernel command line option and cpuset iso-
> late partitions can remove CPUs from load balance. Similar to task wakeup
> and periodic load balancing, we should not involve isolated CPUs in NUMA
> balancing. When gathering load information for nodes, we need to ignore the
> load of isolated CPUs. This change also avoids selecting an isolated CPU
> as the idle_cpu.

If possible, would you be able to share any performance metrics or benchmarks
that demonstrate the impact of this patch on NUMA balancing or CPU migration
efficiency?

Thanks,
Madadi Vineeth Reddy

> 
> Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com>
> ---
>  kernel/sched/fair.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)