On Friday 13 June 2008 03:19:51 Christoph Lameter wrote: > Populating the per cpu areas on demand is a good thing especially for > configurations with a large number of processors. If we really go to > support 4k processor by default then we need to allocate the smallest > amount of per cpu structures necessary. Maybe ACPI or so can tell us how > many processors are possible and we only allocate those. But it would be > best if the percpu structures are only allocated for actually active > processors. cpu_possible_map should definitely be minimal, but your point is well made: dynamic percpu could actually cut memory allocation. If we go for a hybrid scheme where static percpu is always allocated from the initial chunk, however, we still need the current pessimistic overallocation. Mike's a clever guy, I'm sure he'll think of something :) Rusty. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
