Re: IO controller discussion (Was: Re: [PATCH 01/10] Documentation)

[KAMEZAWA Hiroyuki]

On Sun, 19 Apr 2009 17:53:59 +0200
Andrea Righi <righi.andrea@xxxxxxxxx> wrote:
> > 
> > Got a question for you. Does memory controller already have the per cgroup
> > dirty pages limit? If no, has this been discussed in the past? if yes,
> > what was the conclsion?
> 

IMHO, dirty page handling and I/O throttling is a different problem.

 - A task (or cgroup) which makes the page dirty
 and
 - A task (or cgroup) to which a page is accounted

Is different from each other, in general.

I have a plan to add dirty_ratio to memcg, but it's for avoiding massive stavation in
memory reclaim, not for I/O control.

If you want to implement I/O throttle in MM layer, plz don't depend on memcg.
The perpose is different.

Thanks,
-Kame

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