Re: [PATCH v2] memcg: allow exiting tasks to write back data to swap

[Rik van Riel]

On Thu, 2024-12-12 at 09:51 -0800, Shakeel Butt wrote:
> 
> The fundamental issue is that the exiting process (killed by oomd or
> simple exit) has to allocated memory but the cgroup is at limit and
> the
> reclaim is very very slow.
> 
> I can see attacking this issue with multiple angles.

Besides your proposed ideas, I suppose we could also limit
the gfp_mask of an exiting reclaimer with eg. __GFP_NORETRY,
but I do not know how effective that would be, since a single
pass through the memory reclaim code was still taking dozens
of seconds when I traced the "stuck" workloads.

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