linux-kernel - Re: [rfc 10/10] Pageflags land grab

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Message-ID: <20080301122156.5994b949@bree.surriel.com>
Date:	Sat, 1 Mar 2008 12:21:56 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>, apw@...dowen.org,
	linux-mm@...ck.org
Subject: Re: [rfc 10/10] Pageflags land grab

On Fri, 29 Feb 2008 20:05:44 -0800
Christoph Lameter <clameter@....com> wrote:

> We have enough page flags after vmemmap no longer uses section ids.
> 
> Reserve 5 of the 6 saved flags for functionality that is currently
> under development in the VM.
> 
> The new flags are only available if either of these conditions are met:
> 
> 1. 64 Bit system. (then we have 8 more free of the 32)
> 
> 2. !NUMA. In that case 2 bits are needed for the zone
>    id which leaves 30 page flag bits. Of those we use 24. 6 left.
> 
> 3. !SPARSEMEM. In that case we use 5 bits of the 30 available
>    for the node. 1 leftover.
> 
> 4. SPARSEMEM_VMEMMAP. Case 3 applies.

Nice!  I like your patch series.

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