Messages in this thread | | | Date | Mon, 13 Dec 2010 17:51:06 +0100 | From | Andi Kleen <> | Subject | Re: [RFC PATCH 2/3 v3] perf: Implement Nehalem uncore pmu |
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> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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