linux-kernel - Re: [PATCH v8 2/6] memcontrol: implement mem_cgroup_tryget

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Date:   Tue, 5 Dec 2023 16:16:35 -0800
From:   Chris Li <chrisl@...nel.org>
To:     Nhat Pham <nphamcs@...il.com>
Cc:     akpm@...ux-foundation.org, hannes@...xchg.org,
        cerasuolodomenico@...il.com, yosryahmed@...gle.com,
        sjenning@...hat.com, ddstreet@...e.org, vitaly.wool@...sulko.com,
        mhocko@...nel.org, roman.gushchin@...ux.dev, shakeelb@...gle.com,
        muchun.song@...ux.dev, linux-mm@...ck.org, kernel-team@...a.com,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        shuah@...nel.org
Subject: Re: [PATCH v8 2/6] memcontrol: implement mem_cgroup_tryget_online()

On Mon, Dec 4, 2023 at 5:39 PM Nhat Pham <nphamcs@...il.com> wrote:
>
> > > memcg as a candidate for the global limit reclaim.
> >
> > Very minor nitpick. This patch can fold with the later patch that uses
> > it. That makes the review easier, no need to cross reference different
> > patches. It will also make it harder to introduce API that nobody
> > uses.
>
> I don't have a strong preference one way or the other :) Probably not
> worth the churn tho.

Squashing a patch is very easy. If you are refreshing a new series, it
is worthwhile to do it. I notice on the other thread Yosry pointed out
you did  not use the function "mem_cgroup_tryget_online" in patch 3,
that is exactly the situation my suggestion is trying to prevent.

If you don't have a strong preference, it sounds like you should squash it.

Chris

>
> >
> > Chris
> >
> > >
> > > Signed-off-by: Nhat Pham <nphamcs@...il.com>
> > > ---
> > >  include/linux/memcontrol.h | 10 ++++++++++
> > >  1 file changed, 10 insertions(+)
> > >
> > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> > > index 7bdcf3020d7a..2bd7d14ace78 100644
> > > --- a/include/linux/memcontrol.h
> > > +++ b/include/linux/memcontrol.h
> > > @@ -821,6 +821,11 @@ static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg)
> > >         return !memcg || css_tryget(&memcg->css);
> > >  }
> > >
> > > +static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
> > > +{
> > > +       return !memcg || css_tryget_online(&memcg->css);
> > > +}
> > > +
> > >  static inline void mem_cgroup_put(struct mem_cgroup *memcg)
> > >  {
> > >         if (memcg)
> > > @@ -1349,6 +1354,11 @@ static inline bool mem_cgroup_tryget(struct mem_cgroup *memcg)
> > >         return true;
> > >  }
> > >
> > > +static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
> > > +{
> > > +       return true;
> > > +}
> > > +
> > >  static inline void mem_cgroup_put(struct mem_cgroup *memcg)
> > >  {
> > >  }
> > > --
> > > 2.34.1
> > >
>