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

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Message-ID: <20150415180506.GB5029@twins.programming.kicks-ass.net>
Date:	Wed, 15 Apr 2015 20:05:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kan Liang <kan.liang@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, acme@...radead.org,
	eranian@...gle.com, andi@...stfloor.org
Subject: Re: [PATCH V6 3/6] perf, x86: large PEBS interrupt threshold

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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