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    SubjectRe: Locking comment on shrink_caches()
    >    Ahh, that's a cpu bug -- one my athlons don't suffer from.
    > Your Athlons may handle exclusive cache line acquisition more
    > efficiently (due to memory subsystem performance) but it still
    > does cost something.

    On an exclusive line on Athlon a lock cycle is near enough free, its
    just an ordering constraint. Since the line is in E state no other bus
    master can hold a copy in cache so the atomicity is there. Ditto for newer
    Intel processors
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