Messages in this thread | | | Date | Wed, 28 Nov 2007 17:54:55 -0800 | From | Jeremy Fitzhardinge <> | Subject | Re: [patch 05/14] percpu: Use a Kconfig variable to configure arch specific percpu setup |
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Christoph Lameter wrote: > The percpu areas need to be allocated in a NUMA aware fashion. Otherwise > you use distant memory for the most performance sensitive areas. The NUMA > subsystem must be so far up that these allocations can be performed in the > right way. And this means at least you need to know on which node each > processor is located. That is what the PDA is currently used for and i386 > has no other way of doing that. I think we could use an array [NR_CPUS] > for this one but we want to avoid these arrays because NR_CPUS may get > very big. >
Oh, you mean there needs to be some percpu data mechanism operating in order to do numa-aware allocations, which would be necessary to allocate the percpu memory itself?
I can see how that would be awkward.
J
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