Re: [PATCH 1/2] perf x86: Make intel_pmu_enable_all to enable onlyactive events

[Andi Kleen]

> 
> I think its a NOP; this is the global ctrl register but
> intel_pmu_disable_event() writes PERFEVTSELx.EN = 0, so even if you
> enable it in the global mask, the event should still be disabled.

Yes the hardware ANDs the various enable bits in the different
registers.

-andi
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