Re: [PATCH 0/7] memcg background reclaim , yet another one.

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On Tue, 26 Apr 2011 01:43:17 -0700
Ying Han <yinghan@xxxxxxxxxx> wrote:

> On Tue, Apr 26, 2011 at 12:43 AM, KAMEZAWA Hiroyuki <
> kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> 
> > On Tue, 26 Apr 2011 00:19:46 -0700
> > Ying Han <yinghan@xxxxxxxxxx> wrote:
> >
> > > On Mon, Apr 25, 2011 at 6:38 PM, KAMEZAWA Hiroyuki
> > > <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> > > > On Mon, 25 Apr 2011 15:21:21 -0700
> > > > Ying Han <yinghan@xxxxxxxxxx> wrote:

> 
> > To clarify a bit, my question was meant to account it but not necessary to
> > limit it. We can use existing cpu cgroup to do the cpu limiting, and I am
> >
> just wondering how to configure it for the memcg kswapd thread.
> 
>    Let's say in the per-memcg-kswapd model, i can echo the kswapd thread pid
> into the cpu cgroup ( the same set of process of memcg, but in a cpu
> limiting cgroup instead).  If the kswapd is shared, we might need extra work
> to account the cpu cycles correspondingly.
> 

Hm ? statistics of elapsed_time isn't enough ?

Now, I think limiting scan/sec interface is more promissing rather than time
or thread controls. It's easier to understand.

BTW, I think it's better to avoid the watermark reclaim work as kswapd.
It's confusing because we've talked about global reclaim at LSF.


Thanks,
-Kame

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