linux-kernel - Re: [patch 2/8] mm: memcg-aware global reclaim

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Message-ID: <20110609134559.GB14826@cmpxchg.org>
Date:	Thu, 9 Jun 2011 15:45:59 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Ying Han <yinghan@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/8] mm: memcg-aware global reclaim

On Thu, Jun 09, 2011 at 03:12:03PM +0200, Michal Hocko wrote:
> On Wed 01-06-11 08:25:13, Johannes Weiner wrote:
> [...]
> 
> Just a minor thing. I am really slow at reviewing these days due to
> other work that has to be done...
> 
> > +struct mem_cgroup *mem_cgroup_hierarchy_walk(struct mem_cgroup *root,
> > +					     struct mem_cgroup *prev)
> > +{
> > +	struct mem_cgroup *mem;
> 
> You want mem = NULL here because you might end up using it unitialized
> AFAICS (css_get_next returns with NULL).

Thanks for pointing it out.  It was introduced when I switched from
using @prev to continue the search to using root->last_scanned_child.

It's fixed now.
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