Peter Zijlstra [off-list ref] writes:

So does it make sense to have a set of sets?

Why not integrate them all into one set to be ruled by this governor
thing?

cpuidle is currently optional, that is why the two level hierarchy
is there so that you can still have simple idle selection without it.

% size drivers/cpuidle/*.o
   text    data     bss     dec     hex filename
   5514    1416      44    6974    1b3e drivers/cpuidle/built-in.o

Adding it unconditionally would add ~7k to everyone who wants idle functions.

I think making it unconditional would require putting it on a serious
diet first.

-Andi
-- 
ak@linux.intel.com -- Speaking for myself only.