To: Christoph Lameter <clameter@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [rfc 10/10] Pageflags: Land grab
From: Andi Kleen <andi@firstfloor.org>
References: <20080304000452.514878384@sgi.com>
	<20080304000734.383475547@sgi.com>
Date: Tue, 04 Mar 2008 02:27:55 +0100
In-Reply-To: <20080304000734.383475547@sgi.com> (Christoph Lameter's message of "Mon\, 03 Mar 2008 16\:05\:02 -0800")
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Christoph Lameter <clameter@sgi.com> writes:
>
> The page flags situation becomes very tight. The remaining 6 bits must then
> be used as section ids. Via a lookup table we can determine the node ids from
> the section id. So it would work.
>
> However, we would have no page flags left. Any additional page flag will
> reduce the number of available sparsemem sections to half.

I have an upcoming, soon to be posted, project that needs one page
flag on 32bit and two on 64bit. I would request that you leave
at least that many over.

-Andi
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