Re: [REGRESSION] mm/mprotect: 2x+ slowdown for >=400KiB regions since PTE batching (cac1db8c3aad)

[David Hildenbrand (Arm)]

On 2/13/26 16:08, Luke Yang wrote:
> Hello,

Hi!

> we have bisected a significant mprotect() performance regression in
> 6.17-rc1 to:
>
> cac1db8c3aad ("mm: optimize mprotect() by PTE batching")
>
> The regression becomes clearly visible starting around 400 KiB region
> sizes and above. It is also still present in the latest 6.19 kernel.

Micro-benchmark results are nice. But what is the real word impact? IOW, 
why should we care?

--
Cheers,

David