Re: [v2 PATCH] arm64: mm: show direct mapping use in /proc/meminfo

[Yang Shi]

On 11/19/25 11:12 AM, Catalin Marinas wrote:
> From: Catalin Marinas <catalin.marinas@xxxxxxx>
>
> On Thu, 23 Oct 2025 14:52:10 -0700, Yang Shi wrote:
> > Since commit a166563e7ec3 ("arm64: mm: support large block mapping when
> > rodata=full"), the direct mapping may be split on some machines instead
> > keeping static since boot. It makes more sense to show the direct mapping
> > use in /proc/meminfo than before.
> > This patch will make /proc/meminfo show the direct mapping use like the
> > below (4K base page size):
> > DirectMap4K:	   94792 kB
> > DirectMap64K:	  134208 kB
> > DirectMap2M:	 1173504 kB
> > DirectMap32M:	 5636096 kB
> > DirectMap1G:	529530880 kB
> >
> > [...]
> It matches Documentation/filesystems/proc.rst, so I'm fine to align
> arm64 with it.

Yes, it does.

> Applied to arm64 (for-next/misc), thanks!
>
> [1/1] arm64: mm: show direct mapping use in /proc/meminfo
>        https://git.kernel.org/arm64/c/1102778cb023

Thanks for taking the patch. However, Ryan noticed some over-accounting 
problems and had some suggestions to code cleanup as well. I'm going to 
submit v3 to the mailing list soon.

Yang
>