linux-kernel - Re: [PATCH 2/2] x86: Modify Kconfig to allow up to 4096 cpus

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Message-ID: <Pine.LNX.4.64.0803261215320.31000@schroedinger.engr.sgi.com>
Date:	Wed, 26 Mar 2008 12:16:41 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mike Travis <travis@....com>
cc:	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86: Modify Kconfig to allow up to 4096 cpus

On Wed, 26 Mar 2008, Mike Travis wrote:

> I guess the main effect is that "MAXSMP" represents what's really
> usable for an architecture based on other factors.  The limit of
> NODES_SHIFT = 15 is that it's represented in some places as a signed
> 16-bit value, so 15 is the hard limit without coding changes, not
> an architecture limit.

NODES_SHIFT also controls how many page flag bits are set aside for the 
node number. If you limit x86_64 to 512 nodes then lets keep this at 9.
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