linux-kernel - Re: [PATCH 4/4] memcg: prevent from reclaiming if there are per-cpu cached charges

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Message-Id: <20110722091858.f4b78e14.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 22 Jul 2011 09:18:58 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	Balbir Singh <bsingharora@...il.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] memcg: prevent from reclaiming if there are per-cpu
 cached charges

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

> On Thu, 21 Jul 2011 14:30:12 +0200
> Michal Hocko <mhocko@...e.cz> 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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