linux-kernel - Re: [PATCH 1/2] mm: memcontrol: basic memory statistics in cgroup2 memory controller

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Message-ID: <20160114202521.GB20218@cmpxchg.org>
Date:	Thu, 14 Jan 2016 15:25:21 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Vladimir Davydov <vdavydov@...tuozzo.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...com
Subject: Re: [PATCH 1/2] mm: memcontrol: basic memory statistics in cgroup2
 memory controller

On Wed, Jan 13, 2016 at 02:49:30PM -0800, Andrew Morton wrote:
> > @@ -5095,6 +5107,46 @@ static int memory_events_show(struct seq_file *m, void *v)
> >  	return 0;
> >  }
> >  
> > +static int memory_stat_show(struct seq_file *m, void *v)
> > +{
> > +	struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
> > +	int i;
> > +
> > +	/* Memory consumer totals */
> > +
> > +	seq_printf(m, "anon %lu\n",
> > +		   tree_stat(memcg, MEM_CGROUP_STAT_RSS) * PAGE_SIZE);
> 
> Is there any reason why this won't overflow a longword on 32-bit?

It will, I don't know what I was thinking there. Fixed in the update.