On Wed, Mar 31, 2021 at 2:22 PM Christian Borntraeger
<borntraeger@xxxxxxxxxx> wrote:
>
>
>
> On 30.03.21 18:25, Muchun Song wrote:
> > On Tue, Mar 30, 2021 at 11:10 PM Christian Borntraeger
> > <borntraeger@xxxxxxxxxx> wrote:
> >>
> >>
> >> On 30.03.21 15:49, Muchun Song wrote:
> >>> On Tue, Mar 30, 2021 at 9:27 PM Christian Borntraeger
> >>> <borntraeger@xxxxxxxxxx> wrote:
> >>>>
> >>>> So bisect shows this for belows warning:
> >>>
> >>> Thanks for your effort on this. Can you share your config?
> >>
> >> attached (but its s390x) for next-20210330
> >
> > Thanks. Can you apply the following patch and help me test?
> > Very Thanks.
> >
> > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> > index 7fdc92e1983e..579408e4d46f 100644
> > --- a/include/linux/memcontrol.h
> > +++ b/include/linux/memcontrol.h
> > @@ -793,6 +793,12 @@ static inline void obj_cgroup_get(struct obj_cgroup *objcg)
> > percpu_ref_get(&objcg->refcnt);
> > }
> >
> > +static inline void obj_cgroup_get_many(struct obj_cgroup *objcg,
> > + unsigned long nr)
> > +{
> > + percpu_ref_get_many(&objcg->refcnt, nr);
> > +}
> > +
> > static inline void obj_cgroup_put(struct obj_cgroup *objcg)
> > {
> > percpu_ref_put(&objcg->refcnt);
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index c0b83a396299..1634dba1044c 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -3133,7 +3133,10 @@ void split_page_memcg(struct page *head, unsigned int nr)
> >
> > for (i = 1; i < nr; i++)
> > head[i].memcg_data = head->memcg_data;
> > - css_get_many(&memcg->css, nr - 1);
> > + if (PageMemcgKmem(head))
> > + obj_cgroup_get_many(__page_objcg(head), nr - 1);
> > + else
> > + css_get_many(&memcg->css, nr - 1);
> > }
> >
> > #ifdef CONFIG_MEMCG_SWAP
> >
>
> This one seems to do the trick, I can no longer see the warning.
Thanks for your testing. I will send a fix patch.
