Re: [LSF/MM TOPIC] Few things I would like to discuss

[Glauber Costa <glommer@parallels.com>]

On 02/05/2013 04:35 PM, Michal Hocko wrote:
> Hi,
> I would like to discuss the following topics:
> * memcg oom should be more sensitive to locked contexts because now
>   it is possible that a task is sitting in mem_cgroup_handle_oom holding
>   some other lock (e.g. i_mutex or mmap_sem) up the chain which might
>   block other task to terminate on OOM so we basically end up in a
>   deadlock. Almost all memcg charges happen from the page fault path
>   where we can retry but one class of them happen from
>   add_to_page_cache_locked and that is a bit more problematic.

This is not the case with kmemcg on. Those charges will usually happen
from the slab/slub grow_cache mechanism, or during fork. This is not to
invalidate your reasoning - since those are usually tricky in terms of
context as well, and would benefit just as much - but to complete it.

> * I would really like to finally settle down on something wrt. soft
>   limit reclaim. I am pretty sure Ying would like to discuss this topic
>   as well so I will not go into details about it. I will post what I
>   have before the conference so that we can discuss her approach and
>   what was the primary disagreement the last time. I can go into more
>   ditails as a follow up if people are interested of course.

This interests me very much as well.



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