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    SubjectRe: Locking comment on shrink_caches()
    >    See prefetching - the CPU prefetching will hide some of the effect and
    > the spin_lock_prefetch() macro does wonders for the rest.
    > Well, if prefetching can do it faster than avoiding the transaction
    > altogether, I'm game :-)

    That would depend on the cost of avoidance, the amount of contention and
    the distance ahead you can fetch. Avoiding it also rather more portable so
    I suspect you win

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