Re: live kernel upgrades (was: live kernel patching design)

From: Ingo Molnar
Date: Sun Feb 22 2015 - 05:48:51 EST

* Ingo Molnar <mingo@xxxxxxxxxx> wrote:

> We have many of the building blocks in place and have
> them available:
> - the freezer code already attempts at parking/unparking
> threads transparently, that could be fixed/extended.
> - hibernation, regular suspend/resume and in general
> power management has in essence already implemented
> most building blocks needed to enumerate and
> checkpoint/restore device state that otherwise gets
> lost in a shutdown/reboot cycle.
> - c/r patches started user state enumeration and
> checkpoint/restore logic

I forgot to mention:

- kexec allows the loading and execution of a new
kernel image.

It's all still tons of work to pull off a 'live kernel
upgrade' on native hardware, but IMHO it's tons of very
useful work that helps a dozen non-competing projects,


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