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

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Message-Id: <20110420115804.461E.A69D9226@jp.fujitsu.com>
Date:	Wed, 20 Apr 2011 11:57:48 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	kosaki.motohiro@...fujitsu.com, Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	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, David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards

> On Wed, 2011-04-20 at 10:23 +0900, KOSAKI Motohiro wrote:
> > > On Tue, 19 Apr 2011, James Bottomley wrote:
> > > 
> > > > > Which part of me telling you that you will break lots of other things in
> > > > > the core kernel dont you get?
> > > >
> > > > I get that you tell me this ... however, the systems that, according to
> > > > you, should be failing to get to boot prompt do, in fact, manage it.
> > > 
> > > If you dont use certain subsystems then it may work. Also do you run with
> > > debuggin on.
> > > 
> > > The following patch is I think what would be needed to fix it.
> > 
> > I'm worry about this patch. A lot of mm code assume !NUMA systems 
> > only have node 0. Not only SLUB.
> > 
> > I'm not sure why this unfortunate mismatch occur. but I think DISCONTIG
> > hacks makes less sense. Can we consider parisc turn NUMA on instead?
> 
> Well, you mean a patch like this?  It won't build ... obviously we need
> some more machinery
> 
>   CC      arch/parisc/kernel/asm-offsets.s
> In file included from include/linux/sched.h:78,
>                  from arch/parisc/kernel/asm-offsets.c:31:
> include/linux/topology.h:212:2: error: #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
> In file included from include/linux/sched.h:78,
>                  from arch/parisc/kernel/asm-offsets.c:31:
> include/linux/topology.h: In function 'numa_node_id':
> include/linux/topology.h:255: error: implicit declaration of function 'cpu_to_node'

Sorry about that. I'll see more carefully the code later. Probably long
time discontig-mem uninterest made multiple level breakage. Grr. ;-)



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