Re: [RFC][PATCH 8/8] RSS controller support reclamation

[Arjan van de Ven]

On Fri, 2006-11-10 at 01:06 +0530, Balbir Singh wrote:
> 
> Reclaim memory as we hit the max_shares limit. The code for reclamation
> is inspired from Dave Hansen's challenged memory controller and from the
> shrink_all_memory() code


Hmm.. I seem to remember that all previous RSS rlimit attempts actually
fell flat on their face because of the reclaim-on-rss-overflow behavior;
in the shared page / cached page (equally important!) case, it means
process A (or container A) suddenly penalizes process B (or container B)
by making B have pagecache misses because A was using a low RSS limit.

Unmapping the page makes sense, sure, and even moving then to inactive
lists or whatever that is called in the vm today, but reclaim... that's
expensive...


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