>
> 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.
-Andi
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