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Date: Thu, 20 Jun 2002 08:27:00 -0700
From: William Lee Irwin III <wli@holomorphy.com>
To: Jirka Kosina <jikos@jikos.cz>
Cc: Brian Gerst <bgerst@didntduck.org>, devnull@adc.idt.com,
       linux-kernel@vger.kernel.org
Subject: Re: >3G Memory support
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On Thu, 20 Jun 2002, Brian Gerst wrote:
>> Hardware limitations imposed by the x86 architecture.  The x86 only has 
>> _one_ virtual address space, which has to be shared by user space and 
>> kernel space.  It is not possible to give user space more virtual 
>> address space without taking it away from the kernel.

On Thu, Jun 20, 2002 at 04:50:26PM +0200, Jirka Kosina wrote:
> You can theoretically run kernel in one task (I mean "task" in the 
> Intel-processor-meaning of the word ;) ) and userspace programs in another 
> task, which will result in having 4GB of memory for both of them, won't 
> it?

This is what BIGMEM did. It predated the current highmem implementation.


Cheers,
Bill
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