module auto-unload

[Paul Goyette <paul%whooppee.com@localhost>]

Given the recent discussion on the usefulness of auto-unload, would it 
possibly make sense to enable/disable this via a new sysctl variable?

We could make kern.module.unload_delay default to 10 seconds (the 
current default);  if the delay is ever set to a non-positive value, it 
would disable the auto-unload feature completely.

Comments?


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