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c1c3443c9c
It's necessary to fake the node-to-cpumask mapping so that an emulated node ID returns a cpumask that includes all cpus that have affinity to the memory it represents. This is a little intrusive because it requires knowledge of the physical topology of the system. setup_physnodes() gives us that information, but since NUMA emulation ends up altering the physnodes array, it's necessary to reset it before cpus are brought online. Accordingly, the physnodes array is moved out of init.data and into cpuinit.data since it will be needed on cpuup callbacks. This works regardless of whether numa=fake is used on the command line, or the setup of the fake node succeeds or fails. The physnodes array always contains the physical topology of the machine if CONFIG_NUMA_EMU is enabled and can be used to setup the correct node-to-cpumask mappings in all cases since setup_physnodes() is called whenever the array needs to be repopulated with the correct data. To fake the actual mappings, numa_add_cpu() and numa_remove_cpu() are rewritten for CONFIG_NUMA_EMU so that we first find the physical node to which each cpu has local affinity, then iterate through all online nodes to find the emulated nodes that have local affinity to that physical node, and then finally map the cpu to each of those emulated nodes. Signed-off-by: David Rientjes <rientjes@google.com> LKML-Reference: <alpine.DEB.2.00.1012221701520.3701@chino.kir.corp.google.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> |
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