linux-kernel - Re: + mm-memcontrol-correct-the-nr_anon_thps-counter-of-hierarchical-memcg-fix.patch added to -mm tree

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Message-Id: <20201028162453.530ab33e20b3722a367b8b9a@linux-foundation.org>
Date:   Wed, 28 Oct 2020 16:24:53 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Michal Hocko <mhocko@...e.com>
Cc:     linux-kernel@...r.kernel.org, hannes@...xchg.org,
        mm-commits@...r.kernel.org, zhongjiang-ali@...ux.alibaba.com
Subject: Re: +
 mm-memcontrol-correct-the-nr_anon_thps-counter-of-hierarchical-memcg-fix.patch
 added to -mm tree

On Tue, 27 Oct 2020 08:21:57 +0100 Michal Hocko <mhocko@...e.com> wrote:

> > --- a/mm/memcontrol.c~mm-memcontrol-correct-the-nr_anon_thps-counter-of-hierarchical-memcg-fix
> > +++ a/mm/memcontrol.c
> > @@ -4107,7 +4107,7 @@ static int memcg_stat_show(struct seq_fi
> >  		if (memcg1_stats[i] == NR_ANON_THPS)
> >  			nr *= HPAGE_PMD_NR;
> >  #endif
> > -		seq_printf(m, "total_%s %llu\n", memcg1_stat_names[i],
> > +		seq_printf(m, "total_%s %lu\n", memcg1_stat_names[i],
> >  						nr * PAGE_SIZE);
> 
> Shouldn't we cast to u64 instead? 32b systems with a lot of memory are
> quite rare but going over 4G here is not something unimaginable. The
> similar is true for other counters.

Sure..

--- a/mm/memcontrol.c~mm-memcontrol-correct-the-nr_anon_thps-counter-of-hierarchical-memcg-fix-fix
+++ a/mm/memcontrol.c
@@ -4119,8 +4119,8 @@ static int memcg_stat_show(struct seq_fi
 		if (memcg1_stats[i] == NR_ANON_THPS)
 			nr *= HPAGE_PMD_NR;
 #endif
-		seq_printf(m, "total_%s %lu\n", memcg1_stat_names[i],
-						nr * PAGE_SIZE);
+		seq_printf(m, "total_%s %llu\n", memcg1_stat_names[i],
+						(u64)nr * PAGE_SIZE);
 	}
 
 	for (i = 0; i < ARRAY_SIZE(memcg1_events); i++)
_