linux-kernel - Re: Kernel vs user memory

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Message-ID: <49717D03.2030205@zytor.com>
Date:	Fri, 16 Jan 2009 22:38:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	sidc7 <siddhartha.chhabra@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Kernel vs user memory

sidc7 wrote:
> If I am not mistaken, Linux kernel is a high memory kernel, hence for Linux
> kernel, nothing will be mapped to the kernel space, other than the memory
> beyond 896MB which is the kernel's virtual address space. Am I right on
> this?

It's a compilation option, and depends on the architecture.  What you
described is true for an i386 kernel compiled as a highmem kernel.  On
the other hand, a 64 bit kernel is *never* highmem.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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