Re: [patch] mm: memcg: do not declare OOM from __GFP_NOFAIL allocations

David Rientjes
2013-11-27T21:38:59Z

On Wed, 27 Nov 2013, Johannes Weiner wrote:

> > Ah, this is because of 3168ecbe1c04 ("mm: memcg: use proper memcg in limit
> > bypass") which just bypasses all of these allocations and charges the root
> > memcg. So if allocations want to bypass memcg isolation they just have to
> > be __GFP_NOFAIL?
>
> I don't think we have another option.
>

We don't give __GFP_NOFAIL allocations access to memory reserves in the
page allocator and we do call the oom killer for them so that a process is
killed so that memory is freed. Why do we have a different policy for
memcg?