Anticipatory prefaulting raises the highest fault rate obtainable three-fold
through gang scheduling faults but may allocate some pages to a task that are
not needed.

IIRC that costed more than it saved, at least for forky workloads like a
kernel compile - extra cost in zap_pte_range etc. If things have changed
substantially in that path, I guess we could run the numbers again - has
been a couple of years.

M.

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