Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support

[Andi Kleen]

> I'm suggesting a perf event option, just like the way that PEBS works.

Right now it's a somewhat experimental feature and just having 
the sysctl is fine. If it turns out that is what everyone uses
such an option could be still added later.

I suspect most people would still use FP if they can, just use
the LBRs if that doesn't work.

-Andi
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