Andi Kleen wrote: > > Haven't read the new patches, but per cpu data always was sized > for all possible CPUs. > >> and N is large, what did it cost? > >> And what are reasonable values of N? > > N should normally not be large anymore, since num_possible_cpus() > is sized based on firmware information now. > *Ahem* virtual machines *ahem*... I have discussed this with Tejun, and the plan is to allocate the percpu information when a processor is first brought online (but not removed when it is offlined again.) It's a real problem for 32-bit VMs, so it's more important than you'd think. -hpa -- 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
