On Thu, Apr 21, 2011 at 12:01 AM, KAMEZAWA Hiroyuki <
kamezawa.hiroyu@jp.fujitsu.com> wrote:

> On Wed, 20 Apr 2011 23:59:52 -0700
> Ying Han <yinghan@google.com> wrote:
>
> > On Wed, Apr 20, 2011 at 11:38 PM, KAMEZAWA Hiroyuki <
> > kamezawa.hiroyu@jp.fujitsu.com> wrote:
> >
> > > On Wed, 20 Apr 2011 23:11:42 -0700
> > > Ying Han <yinghan@google.com> wrote:
> > >
> > > > On Wed, Apr 20, 2011 at 8:48 PM, KAMEZAWA Hiroyuki <
> > > > kamezawa.hiroyu@jp.fujitsu.com> wrote:
>
> > n general, memcg-kswapd can reduce memory down to high watermak only when
> > > the system is not busy. So, this logic tries to remove more memory from
> busy
> > > cgroup to reduce 'hit limit'.
> > >
> >
> > So, the "busy cgroup" here means the memcg has higher (usage - low)?
> >
>
>   high < usage < low < limit
>
> Yes, if background reclaim wins, usage - high decreases.
> If tasks on cgroup uses more memory than reclaim, usage - high increases
> even
> if background reclaim runs. So, if usage-high is large, cgroup is busy.
>
> Yes, I think I understand the (usage - high) in the calculation, but not
the (low - high).

--Ying

>
>
> Thanks,
> -Kame
>
>