linux-kernel - Re: Kernel vs user memory

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Message-ID: <49717A28.2060106@zytor.com>
Date:	Fri, 16 Jan 2009 22:26:48 -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:
> The kernel maintains a free list of pages that are free in physical memory. I
> was wondering, are these pages in the kernel space ? They are not mapped to
> any of the user address space for sure, so will they be in the kernel memory
> ?

On a non-highmem kernel, they will be -- ALL memory is mapped in kernel
space on non-highmem kernels.  For highmem kernels, they will generally
not be mapped at all, unless they are lowmem pages.

	-hpa

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

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