linux-kernel - Re: [RFC][PATCH 2/2] memcg: hardwall hierarhcy for memcg

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Message-Id: <20080605090425.35c9ac0b.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 5 Jun 2008 09:04:25 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	nishimura@....nes.nec.co.jp
Cc:	Daisuke Nishimura <d-nishimura@....biglobe.ne.jp>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"menage@...gle.com" <menage@...gle.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>
Subject: Re: [RFC][PATCH 2/2] memcg: hardwall hierarhcy for memcg

On Wed, 4 Jun 2008 21:32:35 +0900
Daisuke Nishimura <d-nishimura@....biglobe.ne.jp> wrote:

> Hi.
> 
> > @@ -848,6 +937,8 @@ static int mem_cgroup_force_empty(struct
> >  	if (mem_cgroup_subsys.disabled)
> >  		return 0;
> >  
> > +	memcg_shrink_all(mem);
> > +
> >  	css_get(&mem->css);
> >  	/*
> >  	 * page reclaim code (kswapd etc..) will move pages between
> 
> Shouldn't it be called after verifying there remains no task
> in this group?
> 
> If called via mem_cgroup_pre_destroy, it has been verified
> that there remains no task already, but if called via
> mem_force_empty_wrte, there may remain some tasks and
> this means many and many pages are swaped out, doesn't it?
> 
you're right. I misunderstood where the number of children is checked.

Thanks,
-Kame


> 
> Thanks,
> Daisuke Nishimura.
> 

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