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

Arjan van de Ven
2006-11-09T19:45:43Z

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...