linux-kernel - Re: [REPOST] [PATCH 1/3] Move zone_reclaim() outside of CONFIG

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Date:	Thu, 20 Jan 2011 08:49:27 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	linux-mm@...ck.org, akpm@...ux-foundation.org, npiggin@...nel.dk,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kosaki.motohiro@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com
Subject: Re: [REPOST] [PATCH 1/3] Move zone_reclaim() outside of CONFIG_NUMA
 (v3)

On Thu, 20 Jan 2011, Balbir Singh wrote:

> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -253,11 +253,11 @@ extern int vm_swappiness;
>  extern int remove_mapping(struct address_space *mapping, struct page *page);
>  extern long vm_total_pages;
>
> +extern int sysctl_min_unmapped_ratio;
> +extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
>  #ifdef CONFIG_NUMA
>  extern int zone_reclaim_mode;
> -extern int sysctl_min_unmapped_ratio;
>  extern int sysctl_min_slab_ratio;
> -extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
>  #else
>  #define zone_reclaim_mode 0

So the end result of this patch is that zone reclaim is compiled
into vmscan.o even on !NUMA configurations but since zone_reclaim_mode ==
0 noone can ever call that code?

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