Re: [linus:master] [sched/mmcid] 77d7dc8bef: will-it-scale.per_thread_ops 10.4% regression

[Mathieu Desnoyers]

On 2026-01-05 21:15, kernel test robot wrote:
[...]
> now we found a regression in will-it-scale tests. report again FYI the
> performance impact of this change in our tests.
>
>
> kernel test robot noticed a 10.4% regression of will-it-scale.per_thread_ops on:
>
>
> commit: 77d7dc8bef482e987036bc204136bbda552d95cd ("sched/mmcid: Revert the complex CID management")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

This is expected for this preparation patch (revert of complex mm_cid
management) from Thomas. He then builds his new implementation on top
to reduce overhead, but in a different way.

Thanks,

Mathieu

--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com