Re: [NUMA Balancing] e39bb6be9f: will-it-scale.per_thread_ops 64.4% improvement

[Linus Torvalds]

On Fri, Apr 1, 2022 at 2:42 AM kernel test robot <oliver.sang@xxxxxxxxx> wrote:
>
> FYI, we noticed a 64.4% improvement of will-it-scale.per_thread_ops due to commit:
> e39bb6be9f2b ("NUMA Balancing: add page promotion counter")

That looks odd and unlikely.

That commit only modifies some page counting statistics. Sure, it
could be another cache layout thing, and maybe it's due to the subtle
change in how NUMA_PAGE_MIGRATE gets counted, but it still looks a bit
odd.

               Linus