Messages in this thread | | | Date | Wed, 17 Sep 2014 17:33:12 -0700 | From | Dave Hansen <> | Subject | Re: [PATCH] x86: Consider multiple nodes in a single socket to be "sane" |
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On 09/17/2014 03:57 PM, Peter Zijlstra wrote: >> > Another option would be to: >> > 1. Add a new "PKG" level and actually _build_ it with phys_proc_id >> > 2. Make sure to tie the sysfs 'core_siblings' file to PKG >> > 3. Leave the "MC" level as it is now, but define it as being the lowest- >> > common-denominator of core grouping. In other words, the "MC" group >> > will stop at a NUMA node or a socket boundary, whichever it sees >> > first. >> > 4. Chop the "COD_NUMA" level off in sched_init_numa() > No, we should provide an arch override for sched_domain_topology which > has the right setup for the detected topology. > > See arm,powerpc and s390, which already have his.
I _think_ the problem here is that all of the existing topologies describe something below the smallest NUMA node. With the cluster-on-die stuff, we've got a node boundary smack in the middle of the existing topology levels.
So, if we're going to do this with a new sched_domain_topology, we've got to make sure that we eliminate all of the levels below that first NUMA node. I think that means just have a topology with the SMT level alone in it.
Does that work?
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