Re: [RFC PATCH 0/2] kpatch: dynamic kernel patching

[Steven Rostedt]

On Tue, 06 May 2014 20:45:50 +0900
Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx> wrote:


> However, I also think if users can accept such freezing wait-time,
> it means they can also accept kexec based "checkpoint-restart" patching.
> So, I think the final goal of the kpatch will be live patching without
> stopping the machine. I'm discussing the issue on github #138, but that is
> off-topic. :)
> 

I agree with Ingo too. Being conservative at first is the right
approach here. We should start out with a stop_machine making sure that
everything is sane before we continue. Sure, that's not much different
than a kexec, but lets take things one step at a time.

ftrace did the stop_machine (and still does for some archs), and slowly
moved to a more efficient method. kpatch/kgraft should follow suit.

-- Steve
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