[gentoo-user] When to reboot after updates to the system

[Kevin]

Hi All-

I've read the portage documentation at
http://www.gentoo.org/doc/en/index.xml?catid=gentoo and I've searched
and browsed the gentoo-user mailing list archive, but I have a question
that I don't see answered anywhere.

It seems to me that it must be true that sometimes, after a system
upgrade done with:

emerge -uD system
or
emerge -uD world

I must reboot the computer for the changes to take effect.

I could be wrong on this, but it seems reasonable to me to think that I
should reboot in certain circumstances.  Perhaps after an upgrade to the
 glibc package or other libraries... not sure.

Am I right about this?

If so, can someone tell me under exactly what circumstances I should
reboot immediately after a system update such as these above?  (ie. if
glibc gets updated, if you add a new USE flag that requires recompiling
certain packages, after an update to the sysvinit package, etc.)

I realize of course that if I compile a new kernel and want to use the
new kernel then I need to configure the boot manager and reboot with the
new kernel, but it seems to me that there would be other circumstances
aside from this that would require a reboot after a system update.

Thanks for any replies.

-Kevin
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