lkml.org 
[lkml]   [2021]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRE: kernel warning percpu ref in obj_cgroup_release


On 30.03.21 18:25, Muchun Song wrote:
> On Tue, Mar 30, 2021 at 11:10 PM Christian Borntraeger
> <borntraeger@de.ibm.com> wrote:
>>
>>
>> On 30.03.21 15:49, Muchun Song wrote:
>>> On Tue, Mar 30, 2021 at 9:27 PM Christian Borntraeger
>>> <borntraeger@de.ibm.com> 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.

\
 
 \ /
  Last update: 2021-03-31 08:25    [W:0.271 / U:0.004 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site