linux-kernel - Re: The 3G (or nG) Kernel Memory Space Offset

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Message-ID: <44F46EF9.2090000@goop.org>
Date:	Tue, 29 Aug 2006 09:44:41 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Dong Feng <middle.fengdong@...il.com>, Andi Kleen <ak@...e.de>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Paul Mackerras <paulus@...ba.org>,
	Christoph Lameter <clameter@....com>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: The 3G (or nG) Kernel Memory Space Offset

Jan Engelhardt wrote:
> Since it's all just virtual addresses, is the TLB flush really that much 
> different when kernelspace runs from (virtual) 0x00000000-0x3FFFFFFF rather 
> than (virtual)0xC000000-0xFFFFFFFF?
>   

If kernel and userspace are disjoint, they can be in the same address 
space, so there's no need for a TLB flush at all.

    J
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