Re: Topology updates and NUMA-level sched domains
From: Nishanth Aravamudan
Date: Thu Apr 09 2015 - 18:37:25 EST
On 08.04.2015 [12:32:01 +0200], Brice Goglin wrote:
> 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?
There is some mention of "User Space Notification" in cpu-hotplug.txt,
but no idea if it's current.
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