Re: Problem with oom-killer in memcg

[Satoru Moriya <satoru.moriya.br@hitachi.com>]

KAMEZAWA Hiroyuki wrote:

> How many cpus are you using ?

I'm using Xeon E5345(4 core).
 
> I think Balbir (and other people) is planning to add "oom handler" for memcg
> or oom handler cgroup. But we need more study.

Thank you for sharing that with me.

> I assume that you use x86. If so, current bahavior is a bit complicated.
> 
> do_page_fault()
>    -> allocate and charge memory account
>          -> memcg's oom kill is called
>               -> no progress.
> User says "don't use OOM Kill" but no other way than "OOM Kill"
> 
> We don't have much choices here..
>    - kill in force ?
>    - add some sleep ?
>    - freeze cgroup under OOM ? (this seems not easy)
>    - Ask admin to increase size of memory limit ?
> 
> Thank you for reporting, but I can't think of quick fix right now.
> I'll remember this in my TO-DO List.

Ok, thank you very much.

-- 
--- 
Satoru MORIYA
Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: satoru.moriya.br@hitachi.com

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