[PATCH][RFC] dirty balancing for cgroups

KAMEZAWA Hiroyuki kamezawa.hiroyu at jp.fujitsu.com
Thu Jul 10 22:15:11 PDT 2008


On Fri, 11 Jul 2008 13:06:57 +0900 (JST)
yamamoto at valinux.co.jp (YAMAMOTO Takashi) wrote:

> hi,
> 
> > On Wed,  9 Jul 2008 15:00:34 +0900 (JST)
> > yamamoto at valinux.co.jp (YAMAMOTO Takashi) wrote:
> > 
> > > hi,
> > > 
> > > the following patch is a simple implementation of
> > > dirty balancing for cgroups.  any comments?
> > > 
> > > it depends on the following fix:
> > > 	http://lkml.org/lkml/2008/7/8/428
> > > 
> > 
> > A few comments  ;)
> 
> thanks for comments.
> 
> >  - This looks simple but, could you merge this into memory resource controller ?
> 
> why?
> 
3 points.
 1. Is this useful if used alone ?
 2. memcg requires this kind of feature, basically.
 3. I wonder I need more work to make this work well under memcg.

If chasing page->cgroup and memcg make this patch much more complex,
I think this style of implimentation is a choice.

 About 3. 
    Does this works well if I changes get_dirty_limit()'s
    determine_dirtyable_memory() calculation under memcg ?
    But to do this seems not valid if dirty_ratio cgroup and memcg cgroup 
    containes different set of tasks.
 
Thanks,
-Kame



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