linux-kernel - Re: [PATCH 17/18] io-controller: IO group refcounting support

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Date:	Fri, 8 May 2009 08:44:05 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	jens.axboe@...cle.com, ryov@...inux.co.jp, fernando@....ntt.co.jp,
	s-uchida@...jp.nec.com, taka@...inux.co.jp, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, righi.andrea@...il.com,
	agk@...hat.com, dm-devel@...hat.com, snitzer@...hat.com,
	m-ikeda@...jp.nec.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 17/18] io-controller: IO group refcounting support

On Fri, May 08, 2009 at 10:59:31AM +0800, Gui Jianfeng wrote:
> Vivek Goyal wrote:
> ...
> >  
> > -		BUG_ON(!RB_EMPTY_ROOT(&st->active));
> > -		BUG_ON(!RB_EMPTY_ROOT(&st->idle));
> >  	}
> >  
> > -	BUG_ON(iog->sched_data.next_active != NULL);
> > -	BUG_ON(iog->sched_data.active_entity != NULL);
> > -	BUG_ON(entity->tree != NULL);
> > +	/* Drop iocg reference on io group */
> 
>   We'd better to reset iog->iocg_id here since the cgroup is going to destroy.
> 

Hm.., that does not harm. Will do in next version.

Thanks
Vivek
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