Re: Some experience of linux on a Laptop

[ebiederm@xmission.com (Eric W. Biederman)]

David Lang <david.lang@digitalinsight.com> writes:

> if you don't preserve things running in userspace what advantage do you
> have over rebooting?

I use it as part of a bootloader.  Allowing me to boot one kernel
directly from another.   I guess it really is a soft reboot that never
touches any BIOS.  I don't know if anyone else would get value from it.
 
> if you do preserve userspace stuff then you need to also preserve the
> kernel state related to each user process (including network connections,
> etc), and here you are back into the problem that the kernel structures
> may change on you.

Preserving userspace without out any help from user space is quite
a tricky business.  Though with user space help it is fully doable
though it may be a lot of work.

What I have doesn't address perserving user space.  I offered because
I didn't know what was wanted.  An easy kernel upgrade without touching
running processes or a just a fast way to get into a new kernel.

Eric