Re: [PATCH 6.18.y 1/2] mm/damon/core: allow esz to be set to zero

[SJ Park <sj@kernel.org>]

On Wed, 30 Sep 2026 06:34:35 +0200 Greg KH <greg@kroah.com> wrote:

> On Tue, Sep 29, 2026 at 12:13:19PM -0700, SJ Park wrote:
> > Hello stable team,
> > 
> > 
> > Please don't apply this patch.
> > 
> > On Tue, 29 Sep 2026 10:44:55 -0700 SJ Park <sj@kernel.org> wrote:
> > 
> > > From: Liew Rui Yan <aethernet65535@gmail.com>
> > > 
> > > When the temporal quota goal tuner determines that the goal has been
> > > achieved (score >= 10000), it sets esz_bp to zero so that the esz becomes
> > > zero.  However, damos_set_effective_quota() clamps the esz to
> > > min_region_sz when quota->ms is set.
> > > 
> > > This is a minor issue, the main problem is that it doesn't match the
> > > description in the documentation, which state that if the goal has already
> > > been [over-]achieved, the quota will be set to zero.
> > > 
> > > Fix this by set quota (esz) as minimum as possible.
> > > 
> > > Link: https://lore.kernel.org/20260908135413.97570-1-sj@kernel.org
> > > Fixes: 8bbde987c2b8 ("mm/damon/core: disallow time-quota setting zero esz")
> > 
> > The problem happens only when there is temporal tuner.  Temporal tuner is a
> > feature that introduced in 7.1.  Hence <7.1 stable kernels don't have the
> > temporal tuner, and this patch shouldn't be applied.
> 
> SHould we skip patch 2/2 here too?

2/2 is good.  Sorry for not clarifying it.  Please let me know if there is
anything I can help.


Thanks,
SJ