linux-kernel - Re: [PATCH 11/35] lmb: Add find_memory_core

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Date:	Sat, 15 May 2010 08:34:48 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai.lu@...cle.com>
Cc:	David Miller <davem@...emloft.net>, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 11/35] lmb: Add find_memory_core_early()

On Fri, 2010-05-14 at 09:44 -0700, Yinghai Lu wrote:
> On 05/14/2010 01:30 AM, David Miller wrote:
> > From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> > Date: Fri, 14 May 2010 18:19:47 +1000
> >
> >   
> >> OK, I'll have to let Davem deal with the fine point of the sparc bits,
> >> but I think basically sparc has CONFIG_ARCH_POPULATES_NODE_MAP set, but
> >> the way it's NUMA affinity works, the early_node_map[] is crap, you
> >> cannot rely on the ranges in there.
> >>     
> >   
> 
> > Right, we can't use early_node_map[] on sparc, because the NUMA
> > mappings are far too granular to use that kind of representation.
> >   
> good to know.
> 
> early_node_map[] doesn't have enough slot?

I think that's the case. sparc doesn't override MAX_ACTIVE_REGIONS,
which means you get the default which is 256 or 50 per node depending
on MAX_NUMNODES. My understanding is that this may not be enough.

Dave, what does it look like in practice tho ?

Cheers,
Ben.


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