On 10.04.2015 [10:31:53 +0200], Peter Zijlstra wrote:
> On Thu, Apr 09, 2015 at 03:29:56PM -0700, Nishanth Aravamudan wrote:
> > > 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.
> >
> > The analogy may have be
On 10.04.2015 [11:08:10 +0200], Peter Zijlstra wrote:
> On Fri, Apr 10, 2015 at 10:31:53AM +0200, Peter Zijlstra wrote:
> > Please, step back, look at what you're doing and ask yourself, will any
> > sane person want to use this? Can they use this?
> >
> > If so, start by describing the desired us
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
On Wed, Apr 08, 2015 at 12:32:01PM +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 han
On Tue, Apr 07, 2015 at 10:14:10AM -0700, Nishanth Aravamudan wrote:
> > So I think (and ISTR having stated this before) that dynamic cpu<->node
> > maps are absolutely insane.
>
> Sorry if I wasn't involved at the time. I agree that it's a bit of a
> mess!
>
> > There is a ton of stuff that assu
On 07.04.2015 [12:21:47 +0200], Peter Zijlstra wrote:
> On Mon, Apr 06, 2015 at 02:45:58PM -0700, Nishanth Aravamudan wrote:
> > Hi Peter,
> >
> > As you are very aware, I think, power has some odd NUMA topologies (and
> > changes to the those topologies) at run-time. In particular, we can see
> >
On Mon, Apr 06, 2015 at 02:45:58PM -0700, Nishanth Aravamudan wrote:
> Hi Peter,
>
> As you are very aware, I think, power has some odd NUMA topologies (and
> changes to the those topologies) at run-time. In particular, we can see
> a topology at boot:
>
> Node 0: all Cpus
> Node 7: no cpus
>
>
Hi Peter,
As you are very aware, I think, power has some odd NUMA topologies (and
changes to the those topologies) at run-time. In particular, we can see
a topology at boot:
Node 0: all Cpus
Node 7: no cpus
Then we get a notification from the hypervisor that a core (or two) have
moved from node
