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    SubjectRe: [RFC PATCH 2/3 v3] perf: Implement Nehalem uncore pmu
    > If think there you want something like:
    >
    > if (cpu == cpumask_first(topology_core_siblings(cpu)) {
    >       rdmsrl(MSR_IA32_DEBUGCTLMSR, val);
    >     wrmsrl(MSR_IA32_DEBUGCTLMSR, val | DEBUGCTLMSR_ENABLE_UNCORE_PMI);
    > }

    You have to be careful with hotplug. The code would need to be rerun
    on hotplug. Otherwise the interrupt may end up on a downed CPU.
    -Andi
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