linux-kernel - Re: [PATCH mmotm/next] vmscan-memcg-always-use-swappiness-of-the-reclaimed-memcg-swappiness-and-o om-control-fix.patch

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Date:	Wed, 28 May 2014 09:44:36 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH mmotm/next]
 vmscan-memcg-always-use-swappiness-of-the-reclaimed-memcg-swappiness-and-o
 om-control-fix.patch

On Tue 27-05-14 14:38:40, Hugh Dickins wrote:
> mem_cgroup_swappiness() oopses immediately when
> booted with cgroup_disable=memory.  Fix that in the obvious inelegant
> way for now - though I hope we are moving towards a world in which
> almost all of the mem_cgroup_disabled() tests will vanish, with a
> root_mem_cgroup which can handle the basics even when disabled.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

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

Thanks!

> ---
> 
>  mm/memcontrol.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- mmotm/mm/memcontrol.c	2014-05-21 18:12:18.072022438 -0700
> +++ linux/mm/memcontrol.c	2014-05-21 19:34:30.608546905 -0700
> @@ -1531,7 +1531,7 @@ static unsigned long mem_cgroup_margin(s
>  int mem_cgroup_swappiness(struct mem_cgroup *memcg)
>  {
>  	/* root ? */
> -	if (!memcg->css.parent)
> +	if (mem_cgroup_disabled() || !memcg->css.parent)
>  		return vm_swappiness;
>  
>  	return memcg->swappiness;

-- 
Michal Hocko
SUSE Labs
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