On Thu, 2012-10-18 at 16:19 -0700, Andi Kleen wrote:
> @@ -826,7 +827,8 @@ static inline bool intel_pmu_needs_lbr_smpl(struct 
> perf_event *event)
>                 return true;
>  
>         /* implicit branch sampling to correct PEBS skid */
> -       if (x86_pmu.intel_cap.pebs_trap && event->attr.precise_ip > 1)
> +       if (x86_pmu.intel_cap.pebs_trap && event->attr.precise_ip > 1 &&
> +           x86_pmu.intel_cap.pebs_format < 2)
>                 return true;
>  
>         return false; 

This seems unrelated to TSX, I suppose it belongs in the previous patch?
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