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    SubjectRe: [PATCH] i386-pda UP optimization
    Arjan van de Ven wrote:
    > segment register accesses really are not cheap.
    > Also really it'll be better to use the register userspace is not using,
    > but we had that discussion before; could you remind me why you picked
    > %gs in the first place?

    To leave open the possibility of using the compiler's TLS support in the
    kernel for percpu. I also measured the cost of reloading %gs vs %fs,
    and found no difference between reloading a null selector vs a non-null


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