what is Hot plug in Linux
Just like windows Plug n Play , "Hotplugging" today is mainly "dispatch device events from the kernel to userland" and not only loading modules. If you only need to autoload modules, you can do this with one damn simple generic binary or script pluggged into /sbin/hotplug. But if you need to hook into event to notify system daemons or run programs for specific devices, forget the whole old hotplug package and /sbin/hotplug and run the udev daemon and specify rules to plug into the device events.