Re: [PATCH RFC] mm/memcontrol: reclaim severe usage over high limit in get_user_pages loop

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On Mon 29-07-19 10:28:43, Yang Shi wrote:
[...]
> I don't worry too much about scale since the scale issue is not unique
> to background reclaim, direct reclaim may run into the same problem.

Just to clarify. By scaling problem I mean 1:1 kswapd thread to memcg.
You can have thousands of memcgs and I do not think we really do want
to create one kswapd for each. Once we have a kswapd thread pool then we
get into a tricky land where a determinism/fairness would be non trivial
to achieve. Direct reclaim, on the other hand is bound by the workload
itself.
-- 
Michal Hocko
SUSE Labs



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