linux-kernel - Re: [PATCH 2/9] perf, tools, stat: Support up-scaling of events

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Date:	Tue, 11 Aug 2015 15:25:32 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
	eranian@...gle.com, namhyung@...nel.org, peterz@...radead.org,
	mingo@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/9] perf, tools, stat: Support up-scaling of events

On Fri, Aug 07, 2015 at 06:06:18PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> TopDown needs to multiply events by constants (for example
> the CPU Pipeline Width) to get the correct results.
> The kernel needs to export this factor.
> 
> Today *.scale is only used to scale down metrics (divide), for example
> to scale bytes to MB.
> 
> Repurpose negative scale to mean scaling up, that is multiplying.
> Implement the code for this in perf stat.
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/builtin-stat.c | 27 +++++++++++++++++++--------
>  1 file changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index ea5298a..2590c75 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -179,6 +179,17 @@ static inline int nsec_counter(struct perf_evsel *evsel)
>  	return 0;
>  }
>  
> +static double scale_val(struct perf_evsel *counter, u64 val)
> +{
> +	double uval = val;
> +
> +	if (counter->scale < 0)
> +		uval = val * (-counter->scale);
> +	else if (counter->scale)
> +		uval = val / counter->scale;

hum, do you change the scale logic? the current scale > 0 works like:

	uval = val * counter->scale;

jirka
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