Re: [PATCH v3 1/3] mm: memcg: fix stale protection of reclaim target memcg

[Andrew Morton]

On Fri, 2 Dec 2022 16:38:12 -0800 Yosry Ahmed <yosryahmed@xxxxxxxxxx> wrote:

> On Fri, Dec 2, 2022 at 4:35 PM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > On Fri, 2 Dec 2022 16:26:05 -0800 Yosry Ahmed <yosryahmed@xxxxxxxxxx> wrote:
> >
> > > Andrew, does this need to be picked up by stable branches?
> >
> > Does it?  The changelog doesn't have a clear description of the
> > user-visible effects of the flaw, which is the guiding light for a
> > backport?
> >
> >
> 
> There are 2 example scenarios in the changelog that misbehave without
> this fix, cases where the protection of a memcg that is the target of
> reclaim is not ignored as it should be.

Yes.  I found them quite unclear.  How would someone who is
experiencing a particualr runtime issue be able to recognize whether
this patch might address that issue?