Re: [RFC][PATCH 14/14]memcg: mem+swap accounting

[Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>]

On Mon, 1 Sep 2008 16:58:27 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> On Mon, 1 Sep 2008 16:15:01 +0900
> Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:
> 
> > Hi, Kamezawa-san.
> > 
> > I'm testing these patches on mmotm-2008-08-29-01-08
> > (with some trivial fixes I've reported and some debug codes),
This problem happens on the kernel without debug codes I added.

> > but swap_in_bytes sometimes becomes very huge(it seems that
> > over uncharge is happening..) and I can see OOM
> > if I've set memswap_limit.
> > 
> > I'm digging this now, but have you also ever seen it?
> > 
> I didn't see that.
I see, thanks.

> But, as you say, maybe over-uncharge. Hmm..
> What kind of test ? Just use swap ? and did you use shmem or tmpfs ?
> 
I don't do anything special, and this can happen without shmem/tmpfs
(can happen with shmem/tmpfs, too).

For example:

- make swap out/in activity for a while(I used page01 of ltp).
- stop the test.

[root@localhost ~]# cat /cgroup/memory/01/memory.swap_in_bytes
4096

- swapoff

[root@localhost ~]# swapoff -a
[root@localhost ~]# cat /cgroup/memory/01/memory.swap_in_bytes
18446744073709395968


Thanks,
Daisuke Nishimura.

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