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

[Liang, Kan]

> 
> 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?

We move AUTO_RELOAD and large PEBS check to intel_pmu_hw_config.
But for earlier platform, it calls x86_pmu_hw_config.
So we force single PEBS record for old platform.

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