Re: [RFC PATCH 0/5] crash dump bitmap: scan memory pages in kernel to speedup kernel dump process

H. Peter Anvin
2013-03-08T10:34:03Z

On 03/08/2013 02:06 AM, Jingbai Ma wrote:
>
> Kernel do have some abilities that user space haven't. It's possible to
> map whole memory space of the first kernel into user space on the second
> kernel. But the user space code has to re-implement some parts of the
> kernel memory management system again. And worse, it's architecture
> dependent, more architectures supported, more codes have to be
> implemented. All implementation in user space must be sync to kernel
> implementation. It's may called "flexibility", but it's painful to
> maintain the codes.
>

What? You are basically talking about /dev/mem... there is nothing
particularly magic about it at all.

-hpa

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