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SubjectRe: [PATCH 0/2] memcg: improving scalability by reducing lock contention at charge/uncharge
On Mon, 12 Oct 2009 18:18:44 -0700
Ying Han <yinghan@google.com> wrote:

> Ok. After I am running the task in the child cgroup, I do see performance
> improvement on the page-faults .

Thank you.
Hmm...I wonder what makes cache-miss dramatically larger.
4 process on 4 cpus ? (my script was for 8cpus.)

-Kame

> [Before]
> Performance counter stats for './runpause.sh 10' (5 runs):
>
> 226190.612998 task-clock-msecs # 3.766 CPUs ( +- 0.192%
> )
> 4454 context-switches # 0.000 M/sec ( +- 14.029%
> )
> 38 CPU-migrations # 0.000 M/sec ( +- 15.385%
> )
> 21445296 page-faults # 0.095 M/sec ( +- 1.686%
> )
> 498345012124 cycles # 2203.208 M/sec ( +- 0.023%
> )
> 255638483632 instructions # 0.513 IPC ( +- 0.196%
> )
> 92240143452 cache-references # 407.798 M/sec ( +- 0.673%
> )
> 175412792 cache-misses # 0.776 M/sec ( +- 2.188%
> )
>
> 60.068670564 seconds time elapsed ( +- 0.014% )
>
> [After]
> Performance counter stats for './runpause.sh 10' (5 runs):
>
> 214409.926571 task-clock-msecs # 3.570 CPUs ( +- 0.317%
> )
> 3097 context-switches # 0.000 M/sec ( +- 25.726%
> )
> 14 CPU-migrations # 0.000 M/sec ( +- 20.000%
> )
> 33977467 page-faults # 0.158 M/sec ( +- 4.884%
> )
> 472369769787 cycles # 2203.115 M/sec ( +- 0.024%
> )
> 275624185415 instructions # 0.583 IPC ( +- 0.271%
> )
> 98359325470 cache-references # 458.744 M/sec ( +- 0.281%
> )
> 941121561 cache-misses # 4.389 M/sec ( +- 4.969%
> )
>
> 60.052748032 seconds time elapsed ( +- 0.013% )
>
> --Ying
>
>
> On Mon, Oct 12, 2009 at 5:29 PM, KAMEZAWA Hiroyuki <
> kamezawa.hiroyu@jp.fujitsu.com> wrote:
>
> > On Sun, 11 Oct 2009 11:34:39 -0700
> > Ying Han <yinghan@google.com> wrote:
> >
> > > 2009/10/10 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> >
> > > > This patch series is only for "child" cgroup. Sorry, I had to write it
> > > > clearer. No effects to root.
> > > >
> > >
> > > Ok, Thanks for making it clearer. :) So Do you mind post the cgroup+memcg
> > > configuration
> > > while you are running on your host?
> > >
> >
> > #mount -t cgroup /dev/null /cgroups -omemory
> > #mkdir /cgroups/A
> > #echo $$ > /cgroups/A
> >
> > and run test.
> >
> > Thanks,
> > -Kame
> >
> >
> >
>



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