> > as was mentioned on Kernel Traffic, the spin_unlock optimization (movb $0,%0
> > instead of lock; btrl $0,%0) is not used at last. But could there be a
> > detection routine (I know this is not a completely new and innovative idea)
> > for those older PPro CPUs that require the slow version so that in the sane
> > cases the optimization would be used.
>
> Yes. Runtime option is not acceptable imho. movb $0,%0 can be fast
> but if you need a conditional instruction to test if the fast
> version can be used uses more and more cycles.
Self-modifying code?
/me runs
Rik
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