On Wed, 7 Sep 2005, Martin J. Bligh wrote: > > 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.
Right. The costs come about through wrong anticipations installing useless mappings. The patches that I posted have this feature off by default. Gang scheduling can be enabled by modifying a value in /proc. But I guess the approach is essentially dead unless others want this feature too. The current page fault scalability approach should be fine for a couple of years and who knows what direction mmu technology has taken then. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
