[Buildroot] efficient usb plug in notification

[Christopher Taylor]

I'm trying to see what my best options are of getting USB plugin
notifications in user-space in a buildroot/uClibc env.

Since this is an embedded platform, I'm really concerned about
efficiency of the mechanisms and I'm not sure how efficient udev +
dbus + hal is. Does anyone have any thoughts on this and what some
reasonable alternatives are within the buildroot chain?

-Chris