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

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Message-ID: <Pine.LNX.4.64.0704021526390.23601@schroedinger.engr.sgi.com>
Date:	Mon, 2 Apr 2007 15:29:02 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Dave Hansen <hansendc@...ibm.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, 2 Apr 2007, Dave Hansen wrote:

> 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.

Just look at pfn_to_page and friends on ia64 and see what atrocities 
sparsemem does with those if you enable it.
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