linux-kernel - Re: [PATCH v2] mm: fix the inaccurate memory statistics issue for users

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Message-Id: <20250704131142.54d2bf06d554c9000e2d0c00@linux-foundation.org>
Date: Fri, 4 Jul 2025 13:11:42 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Luiz Capitulino <luizcap@...hat.com>
Cc: Vlastimil Babka <vbabka@...e.cz>, Baolin Wang
 <baolin.wang@...ux.alibaba.com>, "Ritesh Harjani (IBM)"
 <ritesh.list@...il.com>, Michal Hocko <mhocko@...e.com>, david@...hat.com,
 shakeel.butt@...ux.dev, lorenzo.stoakes@...cle.com,
 Liam.Howlett@...cle.com, rppt@...nel.org, surenb@...gle.com,
 donettom@...ux.ibm.com, aboorvad@...ux.ibm.com, sj@...nel.org,
 linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm: fix the inaccurate memory statistics issue for
 users

On Fri, 4 Jul 2025 14:22:11 -0400 Luiz Capitulino <luizcap@...hat.com> wrote:

> > The patch is simple enough.  I'll add fixes:f1a7941243c1 and cc:stable
> > and, as the problem has been there for years, I'll leave the patch in
> > mm-unstable so it will eventually get into LTS, in a well tested state.
> 
> Andrew, are you considering submitting this patch for 6.16? I think
> we should, it does look like a regression for larger systems built
> with 64k base page size.

I wasn't planning on 6.16-rcX because it's been there for years but
sure, I moved it into the mm-hotfixes pile so it'll go Linuswards next
week.

> On comparing a very simple app which just allocates & touches some
> memory against v6.1 (which doesn't have f1a7941243c1) and latest
> Linus tree (4c06e63b9203) I can see that on latest Linus tree the
> values for VmRSS, RssAnon and RssFile from /proc/self/status are
> all zeroes while they do report values on v6.1 and a Linus tree
> with this patch.

Cool, I'll paste this para into the changelog to help people link this
patch with wrong behavior which they are observing.