Re: [PATCH 4/4] memcg: prevent from reclaiming if there are per-cpucached charges

[KAMEZAWA Hiroyuki]

On Fri, 22 Jul 2011 08:56:52 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:

> On Thu, 21 Jul 2011 14:30:12 +0200
> Michal Hocko <mhocko@xxxxxxx> wrote:
 
> Please wait until "background reclaim" stuff. I don't stop it and it will
> make this cpu-caching stuff better because we can drain before hitting
> limit.
> 
> If you cannot wait....
> 
> One idea is to have a threshold to call async "drain". For example,
> 
>  threshould = limit_of_memory - nr_online_cpu() * (BATCH_SIZE + 1)
> 
>  if (usage > threshould)
> 	drain_all_stock_async().
> 
> Then, situation will be much better.
> 

Of course, frequency of this call can be controlled by event counter.

Thanks,
-Kame


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