Re: New NUMA scheduler and hotplug CPU

[Nick Piggin]

Rusty Russell wrote:

> Hi Nick!
>
> 	Looking at your new scheduler in -mm, it uses cpu_online_map
> alot in arch_init_sched_domains.  This means with hotplug CPU that it
> would need to be modified: certainly possible to do, but messy.
>
> 	The other option is to use cpu_possible_map to create the full
> topology up front, and then it need never change.  AFAICT, no other
> changes are neccessary: you already check against moving tasks to
> offline cpus.
>
> Anyway, I was just porting the hotplug CPU patches over to -mm, and
> came across this, so I thought I'd ask.

Hi Rusty,
Yes I'd like to use the cpu_possible_map to create the full
topology straight up. Martin?


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