linux-kernel - Re: [RFC][PATCH 1/3] memcg: wake up filter in oom waitqueue

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Message-Id: <20100312115429.b1b0d994.nishimura@mxp.nes.nec.co.jp>
Date:	Fri, 12 Mar 2010 11:54:29 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	kirill@...temov.name,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [RFC][PATCH 1/3] memcg: wake up filter in oom waitqueue

On Fri, 12 Mar 2010 11:38:38 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> On Fri, 12 Mar 2010 11:30:28 +0900
> Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:
> 
> > On Thu, 11 Mar 2010 16:55:59 +0900, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> > > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > > +	/* check hierarchy */
> > > +	if (!css_is_ancestor(&oom_wait_info->mem->css, &wake_mem->css) &&
> > > +	    !css_is_ancestor(&wake_mem->css, &oom_wait_info->mem->css))
> > > +		return 0;
> > > +
> > I think these conditions are wrong.
> > This can wake up tasks in oom_wait_info->mem when:
> > 
> >   00/ <- wake_mem: use_hierarchy == false
> >     aa/ <- oom_wait_info->mem: use_hierarchy == true;
> > 
> Hmm. I think this line bails out above case.
> 
> > +	if (!oom_wait_info->mem->use_hierarchy || !wake_mem->use_hierarchy)
> > +		return 0;
> 
> No ?
> 
Oops! you're right. I misunderstood the code.

Then, this patch looks good to me.

	Reviewed-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>

Thanks,
Daisuke Nishimura.
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