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Date:      Tue, 7 Aug 2001 21:10:46 -0700 (PDT)
From:      Julian Elischer <julian@elischer.org>
To:        craig <craiglei@pasia.com.cn>
Cc:        tlambert2@mindspring.com, freebsd-hackers@FreeBSD.ORG
Subject:   Re: Why page enable in Kernel space? 
Message-ID:  <Pine.BSF.4.21.0108072109350.70956-100000@InterJet.elischer.org>
In-Reply-To: <002001c11fab$19acaca0$051a0a0a@fd.com>

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On Wed, 8 Aug 2001, craig wrote:

> In general a address in a process is just a linear address which refer
> to physical address indirectly by page directory.  This is reasonable
> in user space. However is it necessary to do such thing in kernel? It
> is sure to have penalty when converting a linear address to physical
> thing. Is it worth doing such thing in kernel.
> 
> I think the performance is the most important in kernel, other thing
> is second. I remember in linux linear address is real physical address
> in kernel space(is it true?).

No

> Why freebsd does not do in the same way?

it wouldn't work..

> 
> 
> craiglei
> 
> 


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