linux-kernel - Re: [PATCH][RFC] dirty balancing for cgroups

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Message-Id: <20080711141511.515e69a5.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 11 Jul 2008 14:15:11 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	yamamoto@...inux.co.jp (YAMAMOTO Takashi)
Cc:	menage@...gle.com, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	linux-mm@...ck.org
Subject: Re: [PATCH][RFC] dirty balancing for cgroups

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

> hi,
> 
> > On Wed,  9 Jul 2008 15:00:34 +0900 (JST)
> > yamamoto@...inux.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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