linux-kernel - Re: [PATCH mmotm/next] memcg-mm-introduce-lowlimit-reclaim-fix2.patch

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Date:	Wed, 28 May 2014 09:44:09 +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] memcg-mm-introduce-lowlimit-reclaim-fix2.patch

On Tue 27-05-14 14:36:04, Hugh Dickins wrote:
> mem_cgroup_within_guarantee() oopses in _raw_spin_lock_irqsave() 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.
> 
> I bet there's a neater way of doing this, rearranging the loop (and we
> shall want to avoid spinlocking on root_mem_cgroup when we reach that
> new world), but that's the kind of thing I'd get wrong in a hurry!
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

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

Thanks!

> ---
> 
>  mm/memcontrol.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> --- mmotm/mm/memcontrol.c	2014-05-21 18:12:18.072022438 -0700
> +++ linux/mm/memcontrol.c	2014-05-21 19:34:30.608546905 -0700
> @@ -2793,6 +2793,9 @@ static struct mem_cgroup *mem_cgroup_loo
>  bool mem_cgroup_within_guarantee(struct mem_cgroup *memcg,
>  		struct mem_cgroup *root)
>  {
> +	if (mem_cgroup_disabled())
> +		return false;
> +
>  	do {
>  		if (!res_counter_low_limit_excess(&memcg->res))
>  			return true;

-- 
Michal Hocko
SUSE Labs
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