Messages in this thread |  | | | Date | Thu, 25 Jun 2009 02:02:02 +0200 | | From | Andi Kleen <> | | Subject | Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support |
> 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@linux.intel.com -- Speaking for myself only.
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