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

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Date:	Fri, 21 Jan 2011 12:49:11 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...ux.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)

* Christoph Lameter <cl@...ux.com> [2011-01-20 08:49:27]:

> 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?
>

The third patch, fixes this with the introduction of a config
(cut-copy-paste below). If someone were to bisect to this point, what
you say is correct.

+#if defined(CONFIG_UNMAPPED_PAGECACHE_CONTROL) ||
defined(CONFIG_NUMA)
 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_slab_ratio;
 #else
-#define zone_reclaim_mode 0
 static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned
int order)
 {
        return 0;
 }
 #endif

Thanks for the review! 

-- 
	Three Cheers,
	Balbir
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