linux-kernel - Re: linux-next ia64 build problems in slqb

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Date:	Tue, 21 Apr 2009 22:07:16 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Christoph Lameter <cl@...ux.com>, Nick Piggin <npiggin@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"randy.dunlap_ocs10g@...cle.com" <randy.dunlap_ocs10g@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"iwamatsu.nobuhiro@...esas.com" <iwamatsu.nobuhiro@...esas.com>
Subject: Re: linux-next ia64 build problems in slqb

Hi Tony,

On Tue, Apr 21, 2009 at 9:45 PM, Luck, Tony <tony.luck@...el.com> wrote:
>> Interesting. What exactly is an UP NUMA machine?
>
> UP + NUMA is a special case of memory-only nodes.  There are
> some (crazy?) customers with problems that require very large
> amounts of memory, but not very much cpu horse power.  They
> buy large multi-node systems and populate all the nodes with
> as much memory as they can afford, but most nodes get zero
> cpus.

Oh, cool. Thanks for the explanation!

On Tue, Apr 21, 2009 at 9:45 PM, Luck, Tony <tony.luck@...el.com> wrote:
>> Anyway, I'm more than
>> happy to apply a tested patch to fix up SLQB. Nick?
>
> I'm trying to check whether http://lkml.org/lkml/2009/4/20/30
> fixes things.  It certainly solves the complilation problem,
> but I'm running into apparently unrelated issues trying to
> boot linux-next kernels.

Great! You can try it on top of the "topic/slqb/core" branch of

  git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6.git

if you want. It's basically plain 2.6.30-rc1 plus SLQB.

One minor nit: the patch should define an empty static inline of
claim_remote_free_list() for the !SMP case. I can fix it at my end
before merging, though, if necessary.

                                       Pekka
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