Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support

[Andi Kleen]

> I assume from the tremendous number of for_each_possible_cpu()s that
> CPU hotplug awareness won't be happening.
> 
> Do we have a feeling for the amount of wastage here?  If
> 
> 	num_possible_cpus() - num_online_cpus() == N

Haven't read the new patches, but per cpu data always was sized
for all possible CPUs.

> and N is large, what did it cost?

> And what are reasonable values of N?

N should normally not be large anymore, since num_possible_cpus() 
is sized based on firmware information now.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/