Andi Kleen wrote:
so INVLPG makes sense for pagetable fault realated single-address
flushes, but they rarely make sense for range flushes. (and that's how
Linux uses it)
I think it would be an interesting experiment to switch flush_tlb_range()
over to INVLPG if the length is below some threshold and see if there
are visible effects in macro benchmarks. The main problem
would be to determine the right threshold -- would likely be CPU dependent.
It would be an interesting experiment. Odds are pretty good that the
cutover is roughly linear in the TLB size.
-hpa
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