linux-kernel - Re: [PATCH 1/3] mm: introduce mem_cgroup

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Message-ID: <20180801055302.GA16767@dhcp22.suse.cz>
Date:   Wed, 1 Aug 2018 07:53:02 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Roman Gushchin <guro@...com>, Linux MM <linux-mm@...ck.org>,
        Johannes Weiner <hannes@...xchg.org>,
        David Rientjes <rientjes@...gle.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Tejun Heo <tj@...nel.org>, kernel-team@...com,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 1/3] mm: introduce mem_cgroup_put() helper

On Tue 31-07-18 07:58:00, Shakeel Butt wrote:
> On Tue, Jul 31, 2018 at 1:45 AM Michal Hocko <mhocko@...nel.org> wrote:
> >
> > On Mon 30-07-18 11:00:58, Roman Gushchin wrote:
> > > Introduce the mem_cgroup_put() helper, which helps to eliminate guarding
> > > memcg css release with "#ifdef CONFIG_MEMCG" in multiple places.
> >
> > Is there any reason for this to be a separate patch? I usually do not
> > like to add helpers without their users because this makes review
> > harder. This one is quite trivial to fit into Patch3 easilly.
> >
> 
> The helper function introduced in this change is also used in the
> remote charging patches, so, I asked Roman to separate this change out
> and thus can be merged independently.

Ok, that was not clear from the description. Then this is ok

Acked-by: Michal Hocko <mhocko@...e.com>
 
> Shakeel
> 
> > > Link: http://lkml.kernel.org/r/20180623000600.5818-2-guro@fb.com
> > > Signed-off-by: Roman Gushchin <guro@...com>
> > > Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
> > > Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
> > > Cc: Shakeel Butt <shakeelb@...gle.com>
> > > Cc: Johannes Weiner <hannes@...xchg.org>
> > > Cc: Michal Hocko <mhocko@...nel.org>
> > > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > > Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > > ---
> > >  include/linux/memcontrol.h | 9 +++++++++
> > >  1 file changed, 9 insertions(+)
> > >
> > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> > > index 6c6fb116e925..e53e00cdbe3f 100644
> > > --- a/include/linux/memcontrol.h
> > > +++ b/include/linux/memcontrol.h
> > > @@ -375,6 +375,11 @@ struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
> > >       return css ? container_of(css, struct mem_cgroup, css) : NULL;
> > >  }
> > >
> > > +static inline void mem_cgroup_put(struct mem_cgroup *memcg)
> > > +{
> > > +     css_put(&memcg->css);
> > > +}
> > > +
> > >  #define mem_cgroup_from_counter(counter, member)     \
> > >       container_of(counter, struct mem_cgroup, member)
> > >
> > > @@ -837,6 +842,10 @@ static inline bool task_in_mem_cgroup(struct task_struct *task,
> > >       return true;
> > >  }
> > >
> > > +static inline void mem_cgroup_put(struct mem_cgroup *memcg)
> > > +{
> > > +}
> > > +
> > >  static inline struct mem_cgroup *
> > >  mem_cgroup_iter(struct mem_cgroup *root,
> > >               struct mem_cgroup *prev,
> > > --
> > > 2.14.4
> > >
> >
> > --
> > Michal Hocko
> > SUSE Labs

-- 
Michal Hocko
SUSE Labs