Re: [PATCH V6 3/6] perf, x86: large PEBS interrupt threshold

[Peter Zijlstra]

On Thu, Apr 09, 2015 at 12:37:43PM -0400, Kan Liang wrote:
> @@ -280,8 +280,9 @@ static int alloc_pebs_buffer(int cpu)
>  	ds->pebs_absolute_maximum = ds->pebs_buffer_base +
>  		max * x86_pmu.pebs_record_size;
>  
> -	ds->pebs_interrupt_threshold = ds->pebs_buffer_base +
> -		thresh * x86_pmu.pebs_record_size;
> +	if (x86_pmu.intel_cap.pebs_format < 1)
> +		ds->pebs_interrupt_threshold = ds->pebs_buffer_base +
> +			x86_pmu.pebs_record_size;
>  
>  	return 0;
>  }

I can't seem to figure out what this is about.. help?
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