linux-kernel - Re: [PATCH mm-unstable v2] mm/page_alloc: keep track of free highatomic

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Message-ID: <CAOUHufZmuUYPNdUMShKwyHJq=tU7EMwjC0Sn5JX26eUVgdmzEw@mail.gmail.com>
Date: Sun, 27 Oct 2024 14:03:05 -0600
From: Yu Zhao <yuzhao@...gle.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Link Lin <linkl@...gle.com>, 
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	Johannes Weiner <hannes@...xchg.org>, Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH mm-unstable v2] mm/page_alloc: keep track of free highatomic

On Sun, Oct 27, 2024 at 1:40 PM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> On 10/26/24 06:40, Yu Zhao wrote:
> > On Fri, Oct 25, 2024 at 10:24 PM Andrew Morton
> > <akpm@...ux-foundation.org> wrote:
> >>
> >> Is a -stable backport needed?
> >>
> >> If so, is a Fixes: target identifiable?
> >
> > The code has been there for many years, and we only recently noticed
> > the problem from Link's repro. So it doesn't look like a stable
> > material.
>
> The stable backportability would be limited as there's a prerequisity on the
> "mm: page_alloc: freelist migratetype hygiene" patchset from half a year ago
> - patch applicability wise and importantly functionality wise.

I don't see any dependency to that series.

> Otherwise the
> counter could drift easily.

Care to elaborate how that could happen?

> However we could perhaps mark it for a 6.12 stable backport as that's
> presumably the upcoming LTS.

Right.