linux-kernel - Re: [PATCH 1/3] mm/memcg: fix last_dead

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Date:	Tue, 14 Jan 2014 14:03:15 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mm/memcg: fix last_dead_count memory wastage

On Mon 13-01-14 17:50:49, Hugh Dickins wrote:
> Shorten mem_cgroup_reclaim_iter.last_dead_count from unsigned long to
> int: it's assigned from an int and compared with an int, and adjacent
> to an unsigned int: so there's no point to it being unsigned long,
> which wasted 104 bytes in every mem_cgroup_per_zone.
>     
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

Acked-by: Michal Hocko <mhocko@...e.cz>

> ---
> Putting this one first as it should be nicely uncontroversial.
> I'm assuming much too late for v3.13, so all 3 diffed against mmotm.
> 
>  mm/memcontrol.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- mmotm/mm/memcontrol.c	2014-01-10 18:25:02.236448954 -0800
> +++ linux/mm/memcontrol.c	2014-01-12 22:21:10.700570471 -0800
> @@ -149,7 +149,7 @@ struct mem_cgroup_reclaim_iter {
>  	 * matches memcg->dead_count of the hierarchy root group.
>  	 */
>  	struct mem_cgroup *last_visited;
> -	unsigned long last_dead_count;
> +	int last_dead_count;
>  
>  	/* scan generation, increased every round-trip */
>  	unsigned int generation;

-- 
Michal Hocko
SUSE Labs
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