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From: Andi Kleen <ak@suse.de>
Subject: Re: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL
Date: Mon, 2 Apr 2007 19:14:07 +0200
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> No no no. For the gazillions time: All of 1-1 mapped kernel memory on 
> x86_64 needs a 2 MB page table entry. The virtual memmap uses the same. 
> There are *no* additional TLBs used.

But why do you reserve an own virtual area then if you claim to not use any
additional mappings? 

-Andi