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

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Date:	Tue, 19 Apr 2011 16:48:36 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	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 Tue, 2011-04-19 at 16:39 -0500, Christoph Lameter wrote:
> On Tue, 19 Apr 2011, James Bottomley wrote:
> 
> > > I guess DISCONTIGMEM is typically used together with NUMA. Otherwise we
> > > would have run into this before.
> >
> > Which bit of my telling you that six architectures already use it this
> > way did you not get?  I'm not really interested in reconciling your
> > theories with how we currently operate.  If you want to require NUMA
> > with DISCONTIGMEM, fine, we'll just define SLUB as broken if that's not
> > true ... that will fix my boot panic reports.
> 
> 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 were able to get to a command prompt
> with SLAB then lets all be happy for as long as it lasts.

We can't re-engineer DISCONTIGMEM as a bug fix, so something like this
has to be done for stable regardless.

James


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