Re: [External] Re: [PATCH 4/4] mm: memcontrol: fix swap uncharge on cgroup v2

[Michal Hocko]

On Mon 15-02-21 18:15:36, Muchun Song wrote:
> On Mon, Feb 15, 2021 at 5:47 PM Michal Hocko <mhocko@xxxxxxxx> wrote:
> >
> > On Sat 13-02-21 01:01:59, Muchun Song wrote:
> > > The swap charges the actual number of swap entries on cgroup v2.
> > > If a swap cache page is charged successful, and then we uncharge
> > > the swap counter. It is wrong on cgroup v2. Because the swap
> > > entry is not freed.
> >
> > Is there any actual problem though? Can you describe the specific
> > scenario please? Swap cache charge life time is a bit tricky and I have
> > to confess I have to relearn it every time I need to understand it. The
> > patch would be much more easier to review if the changelog was much more
> > specific.
> 
> I copied the reply to Shakeel here. :-)

Not helpful much. I have seen that reply before answering your patch.
I really have to say I find it rather annoying to constantly get unclear
and cryptic responses from you. This is a subtle area! Make your claims
clear and specific so they can be verified.

-- 
Michal Hocko
SUSE Labs