linux-kernel - Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Message-ID: <alpine.DEB.2.00.1104211237250.5829@chino.kir.corp.google.com>
Date:	Thu, 21 Apr 2011 12:38:22 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards

On Thu, 21 Apr 2011, KOSAKI Motohiro wrote:

> > diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
> > --- a/arch/parisc/mm/init.c
> > +++ b/arch/parisc/mm/init.c
> > @@ -266,8 +266,10 @@ static void __init setup_bootmem(void)
> >  	}
> >  	memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
> >  
> > -	for (i = 0; i < npmem_ranges; i++)
> > +	for (i = 0; i < npmem_ranges; i++) {
> > +		node_set_state(i, N_NORMAL_MEMORY);
> >  		node_set_online(i);
> > +	}
> >  #endif
> 
> 
> I'm surprised this one. If arch code doesn't initialized N_NORMAL_MEMORY,
> (or N_HIGH_MEMORY. N_HIGH_MEMORY == N_NORMAL_MEMORY if CONFIG_HIGHMEM=n)
> kswapd is created only at node0. wow.
> 
> The initialization must be necessary even if !NUMA, I think. ;-)
> Probably we should have revisit all arch code when commit 9422ffba4a 
> (Memoryless nodes: No need for kswapd) was introduced, at least.
> 

I think we may want to just convert slub (and the memory controller) to 
use N_HIGH_MEMORY rather than N_NORMAL_MEMORY since nothing else uses it 
and the generic code seems to handle N_HIGH_MEMORY for all configs 
appropriately.
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