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

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Message-Id: <20250530160034.94c8aee421266afe6a0b8f9a@linux-foundation.org>
Date: Fri, 30 May 2025 16:00:34 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Michal Hocko <mhocko@...e.com>
Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>, david@...hat.com,
 shakeel.butt@...ux.dev, lorenzo.stoakes@...cle.com,
 Liam.Howlett@...cle.com, vbabka@...e.cz, 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] mm: fix the inaccurate memory statistics issue for
 users

On Fri, 30 May 2025 15:39:36 +0200 Michal Hocko <mhocko@...e.com> wrote:

> > > Fixes: f1a7941243c1 ("mm: convert mm's rss stats into percpu_counter")
> > 
> > Three years ago.
> > 
> > > Tested-by Donet Tom <donettom@...ux.ibm.com>
> > > Reviewed-by: Aboorva Devarajan <aboorvad@...ux.ibm.com>
> > > Tested-by: Aboorva Devarajan <aboorvad@...ux.ibm.com>
> > > Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>
> > > Acked-by: SeongJae Park <sj@...nel.org>
> > > Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> > 
> > Thanks, I added cc:stable to this.
> 
> I have only noticed this new posting now. I do not think this is a
> stable material. I am also not convinced that the impact of the pcp lock
> exposure to the userspace has been properly analyzed and documented in
> the changelog. I am not nacking the patch (yet) but I would like to see
> a serious analyses that this has been properly thought through.

Thanks.  I'll move this into the mm-new branch while we work through
these things.