linux-kernel - Re: [PATCH v3 05/13] Add a __GFP

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Date:	Tue, 18 Sep 2012 15:06:22 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Glauber Costa <glommer@...allels.com>
cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, devel@...nvz.org,
	Tejun Heo <tj@...nel.org>, linux-mm@...ck.org,
	Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH v3 05/13] Add a __GFP_KMEMCG flag

On Tue, 18 Sep 2012, Glauber Costa wrote:

> +++ b/include/linux/gfp.h
> @@ -35,6 +35,11 @@ struct vm_area_struct;
>  #else
>  #define ___GFP_NOTRACK		0
>  #endif
> +#ifdef CONFIG_MEMCG_KMEM
> +#define ___GFP_KMEMCG		0x400000u
> +#else
> +#define ___GFP_KMEMCG		0
> +#endif

Could you leave __GFP_MEMCG a simple definition and then define GFP_MEMCG
to be zer0 if !MEMCG_KMEM? I think that would be cleaner and the
__GFP_KMEMCHECK another case that would be good to fix up.



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