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

Catalin Marinas
2025-11-19T21:10:40Z

On Wed, Nov 19, 2025 at 11:37:13AM -0800, Yang Shi wrote:
> On 11/19/25 11:12 AM, Catalin Marinas wrote:
> > From: Catalin Marinas <catalin.marinas@arm.com>
> >
> > 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.

Ah, yes, I forgot about that. If the change is small, can you submit a
fix instead? I tend not to rebase the for-next/* branches. Otherwise I
can revert and apply a new one.

Thanks.

--
Catalin