Subject: Re: Topology updates and NUMA-level sched domains

From: Brice Goglin <[email-masked]>
Date: Wed, 08 Apr 2015 12:32:01 +0200

Le 07/04/2015 21:41, Peter Zijlstra a écrit :
> No, that's very much not the same. Even if it were dealing with hotplug
> it would still assume the cpu to return to the same node.
>
> But mostly people do not even bother to handle hotplug.
>

You said userspace assumes the cpu<->node relation is a boot-time fixed
one, and hotplug breaks this. How do you expect userspace to handle
hotplug? Is there a convenient way to be notified when a CPU (or memory)
is unplugged?

thanks
Brice