linux-kernel - Re: [v4 PATCH] arm64: mm: show direct mapping use in /proc/meminfo

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Message-ID: <7a1ac262-c992-6ef3-421d-b4419a0c4e19@gentwo.org>
Date: Fri, 21 Nov 2025 13:54:31 -0800 (PST)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Yang Shi <yang@...amperecomputing.com>
cc: catalin.marinas@....com, will@...nel.org, ryan.roberts@....com, 
    linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [v4 PATCH] arm64: mm: show direct mapping use in /proc/meminfo

On Fri, 21 Nov 2025, Yang Shi wrote:

> Although ptdump also can tell the direct map use, but it needs to dump
> the whole kernel page table. It is costly and overkilling. It is also
> in debugfs which may not be enabled by all distros. So showing direct
> map use in /proc/meminfo seems more convenient and has less overhead.

Also done the same way on x86, parisc, powerpc and s390.

Reviewed-by: Christoph Lameter (Ampere) <cl@...two.org>