linux-kernel - Re: [PATCH 1/4] x86_64: Switch to SPARSE

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Date:	Mon, 02 Apr 2007 14:43:50 -0700
From:	Martin Bligh <mbligh@...gle.com>
To:	Christoph Lameter <clameter@....com>
CC:	Dave Hansen <hansendc@...ibm.com>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andy Whitcroft <apw@...dowen.org>
Subject: Re: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL

> Note that these arguments on DISCONTIG are flame bait for many SGIers. 
> We usually see this as an attack on DISCONTIG/VMEMMAP which is the 
> existing best performing implementation for page_to_pfn and vice 
> versa. Please lets stop the polarization. We want one consistent scheme 
> to manage memory everywhere. I do not care what its called as long as it 
> covers all the bases and is not a glaring performance regresssion (like 
> SPARSEMEM so far).

The main conceptual difference (in my mind) was not having one
bastardized data structure (pg_data_t) that meant different
things in different situations (is it a node, or a section
of discontig mem?). Also we didn't support discontig mem within
a node (at least with the old discontigmem), which was partly
the result of that hybridization.

Beyond that, it's just naming really.

M.
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