Re: [PATCH] mm: Add AnonZero accounting for zero-filled anonymous pages

[Kiryl Shutsemau]

On Sat, Feb 14, 2026 at 04:45:14PM +0800, Wenchao Hao wrote:
> Add kernel command line option "count_zero_page" to track anonymous pages
> have been allocated and mapped to userspace but zero-filled.
> 
> This feature is mainly used to debug large folio mechanism, which
> pre-allocates and map more pages than actually needed, leading to memory
> waste from unaccessed pages.
> 
> Export the result in /proc/pid/smaps as "AnonZero" field.

I expect it to slowdown /proc/pid/smaps read substantially. I don't
think this line in smaps worth it.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov