Les wrote:
Hi, Joe, since hotplugging is a hardware function you might consider moving that module down into the hardware section. It would probably simplify some of the arrows as well. I am assuming that by Hotplug, you mean the act of removing and replacing or adding hardware without turning the system off.
I'm no expert at all--I made the slides for a talk that I gave primarily to teach myself(!), and I still don't understand a lot of what goes on. Someone please correct me if I have this mixed up.
My understanding is that, although the initial event is detected by the kernel, practically the first thing the kernel does is fire off a _shell script_ and the rest of the response is handled from user space. It's a bit counter-intuitive that a hardware event should be handled by a user-space mechanism, but it's a good design, and that's what the diagram tries to show.
Fortunately, there are smarter people than me who make this stuff mostly "just work" and I haven't had to look at it in a long time. I see now that you brought it up, that at least that part has changed. There is no "/sbin/hotplug" anymore. I'll have to grub around again and see what the current mechanism is.
I think the relationships between the basic pieces of the diagram are still correct, but it obviously needs to be updated. I should take it down or add a disclaimer ;-)
Thanks for the feedback! <Joe
