On Tue, 18 Feb 2014, Nishanth Aravamudan wrote: > > Well, on powerpc, with the hypervisor providing the resources and the > topology, you can have cpuless and memoryless nodes. I'm not sure how > "fake" the NUMA is -- as I think since the resources are virtualized to > be one system, it's logically possible that the actual topology of the > resources can be CPUs from physical node 0 and memory from physical node > 2. I would think with KVM on a sufficiently large (physically NUMA > x86_64) and loaded system, one could cause the same sort of > configuration to occur for a guest?
Ok but since you have a virtualized environment: Why not provide a fake home node with fake memory that could be anywhere? This would avoid the whole problem of supporting such a config at the kernel level. Do not have a fake node that has no memory. > In any case, these configurations happen fairly often on long-running > (not rebooted) systems as LPARs are created/destroyed, resources are > DLPAR'd in and out of LPARs, etc. Ok then also move the memory of the local node somewhere? > I might look into it, as it might have sped up testing these changes. I guess that will be necessary in order to support the memoryless nodes long term. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
