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Ingo Molnar wrote:
> because userspace does not use it normally, while with %gs we'd switch
> between glibc's descriptor [which must be shadowed by the CPU] and the
> kernel's descriptor [which must be shadowed by the CPU too] - hence
> causing a constant reloading of the shadow register.
>
Well, that means the only operation which would be different would be
the pop %fs at the end, since only it would end up loading a null
selector. All the other operations would presumably take just as long.
J
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