linux-kernel - Re: [patch 04/10] mm: memcontrol: reclaim at least once for __GFP

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Date:	Tue, 3 Jun 2014 15:16:35 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Tejun Heo <tj@...nel.org>,
	Vladimir Davydov <vdavydov@...allels.com>,
	cgroups@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 04/10] mm: memcontrol: reclaim at least once for
 __GFP_NORETRY

On Thu 29-05-14 12:15:56, Johannes Weiner wrote:
> Currently, __GFP_NORETRY tries charging once and gives up before even
> trying to reclaim.  Bring the behavior on par with the page allocator
> and reclaim at least once before giving up.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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

> ---
>  mm/memcontrol.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e8d5075c081f..8957d6c945b8 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2614,13 +2614,13 @@ retry:
>  	if (!(gfp_mask & __GFP_WAIT))
>  		goto nomem;
>  
> -	if (gfp_mask & __GFP_NORETRY)
> -		goto nomem;
> -
>  	nr_reclaimed = mem_cgroup_reclaim(mem_over_limit, gfp_mask, flags);
>  
>  	if (mem_cgroup_margin(mem_over_limit) >= batch)
>  		goto retry;
> +
> +	if (gfp_mask & __GFP_NORETRY)
> +		goto nomem;
>  	/*
>  	 * Even though the limit is exceeded at this point, reclaim
>  	 * may have been able to free some pages.  Retry the charge
> -- 
> 1.9.3
> 

-- 
Michal Hocko
SUSE Labs
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