linux-kernel - Re: [RFC 4/8] Enhance fallback functions in libs to support higher order pages

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Message-Id: <1177095021.10848.18.camel@kleikamp.austin.ibm.com>
Date:	Fri, 20 Apr 2007 18:50:21 +0000
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	Mel Gorman <mel@...net.ie>
Cc:	Christoph Lameter <clameter@....com>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <nickpiggin@...oo.com.au>, Andi Kleen <ak@...e.de>,
	Paul Jackson <pj@....com>, Dave Chinner <dgc@....com>
Subject: Re: [RFC 4/8] Enhance fallback functions in libs to support higher
	order pages

On Fri, 2007-04-20 at 12:05 +0100, Mel Gorman wrote:

> comments about missing page_cache_size() covered elsewhere. However, I
> note that Dave Kleikamp might be interested in this changing of
> page_cache_size() from the perspective of page cache tails. I've added
> him to the cc so he can take a quick look.

Yeah.  I'm working on patches for storing file tails in buffers
allocated from the slab cache, and the tail will be represented by a
fake struct page.  (This is primarily for kernels with a larger page
size).  So my version of page_cache_size(page) may return a different
size for different pages belonging to the same mapping.  I'm in the
midst of cleaning up the patches and plan to post them to linux-mm by
Monday.

Thanks,
Shaggy
-- 
David Kleikamp
IBM Linux Technology Center

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