Re: [RFC][preview] memcg: reduce lock contention at uncharge by batching

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Tue, 25 Aug 2009 13:55:26 +0530
Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> [2009-08-25 11:25:47]:
> 
> > Hi,
> > 
> > This is a preview of a patch for reduce lock contention for memcg->res_counter.
> > This makes series of uncharge in batch and reduce critical lock contention in
> > res_counter. This is still under developement and based on 2.6.31-rc7.
> > I'll rebase this onto mmotm if I'm ready.
> > 
> > I have only 8cpu(4core/2socket) system now. no significant speed up but good lock_stat.
> >
> 
> 
> I'll test this on a 24 way that I have and check. I think these
> patches + resource counter per cpu locking should give good results.
>  
Thank you.

yes. I'm trying re-considering res_counter-percpu, too.
But, hmm, accuracy of counter trade-off is our final trouble if we select it.

Thanks,
-Kame

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