Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH RFC 0/6] Implement per-processor data areas for i386. | Date | Wed, 30 Aug 2006 18:48:39 +0200 |
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> > I don't think so. The whole point is to make the pda easily accessible > with simple addressing modes based on %gs:. I have been wondering if > we can modify the percpu mechanism to get the linker to construct the > layout of the pda, so that all the existing percpu stuff can be > transparently moved into the pda and accessed efficiently. I think it > would be pretty tricky to get it all working though...
I tried that once on x86-64, but it wasn't possible because the linker is missing the right relocations. It has something on the first look similar for __thread data in user space, but it wasn't usable for the kernel.
Even with a single indirection it is still far more efficient than a array lookup.
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