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SubjectRe: Locking comment on shrink_caches()
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>    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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