linux-kernel - Re: [PATCH] mm: memcontrol: fix order calculation in try

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Message-ID: <20150918074217.GD15395@cmpxchg.org>
Date:	Fri, 18 Sep 2015 09:42:17 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Jerome Marchand <jmarchan@...hat.com>
Cc:	Michal Hocko <mhocko@...nel.org>, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: memcontrol: fix order calculation in try_charge()

On Tue, Sep 15, 2015 at 02:05:57PM +0200, Jerome Marchand wrote:
> Since commit <6539cc05386> (mm: memcontrol: fold mem_cgroup_do_charge()),
> the order to pass to mem_cgroup_oom() is calculated by passing the number
> of pages to get_order() instead of the expected  size in bytes. AFAICT,
> it only affects the value displayed in the oom warning message.
> This patch fix this.
> 
> Signed-off-by: Jerome Marchand <jmarchan@...hat.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>

Thanks, Jerome. One minor thing:

> @@ -2032,7 +2032,8 @@ retry:
>  
>  	mem_cgroup_events(mem_over_limit, MEMCG_OOM, 1);
>  
> -	mem_cgroup_oom(mem_over_limit, gfp_mask, get_order(nr_pages));
> +	mem_cgroup_oom(mem_over_limit, gfp_mask,
> +		       get_order(nr_pages * PAGE_SIZE));

fls(nr_pages)?

get_order() is basically fls(x / PAGE_SIZE).
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