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

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Message-Id: <1175550968.22373.122.camel@localhost.localdomain>
Date:	Mon, 02 Apr 2007 14:56:08 -0700
From:	Dave Hansen <hansendc@...ibm.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Martin Bligh <mbligh@...gle.com>,
	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL

On Mon, 2007-04-02 at 14:28 -0700, Christoph Lameter wrote:
> 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). 

I honestly don't doubt that there are regressions, somewhere.  Could you
elaborate, and perhaps actually show us some numbers on this?  Perhaps
instead of adding a completely new model, we can adapt the existing ones
somehow.

But, without some cold, hard, data, we mere mortals without the 1024-way
machines can only guess. ;)

-- Dave

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