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[Xen-devel] [PATCH][RFC][0/2] x86 SMP: enables core-pair topology detection for AMD CPUs


The following two patches enable core-pair topology detection for AMD CPUs. The main idea is to record compute unit information into cpuinfo_x86 and use it when building sibling map. The sibling map will be used by Xen credit scheduler to coordinate VCPU scheduling in a fashion similar to SMT. This code is very similar to upstream Linux kernel.

Regarding the performance improvement, I saw ~8% improvement running kernel compilation on Dom0 with this patch. Anrea Przywara ran a POVRay benchmark using this patch and he saw ~5% improvement. No perf degradation was seen so far.

Please review.


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