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

Yang Shi
2025-11-19T19:37:20Z

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.

Yang
>