linux-kernel - Re: [PATCH 1/4] perf, tools: Output running time and run/enabled ratio in CSV mode

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Date:	Wed, 11 Mar 2015 09:52:41 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, acme@...nel.org,
	jolsa@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] perf, tools: Output running time and run/enabled
 ratio in CSV mode

On Tue, Mar 10, 2015 at 08:37:04AM -0700, Andi Kleen wrote:
> > Why not handle both cases here?
> > 
> > static void print_running(u64 run, u64 ena)
> > {
> > 	if (csv_output)
> > 		fprintf(output, ...);
> > 	else if (run != ena)
> > 		fprintf(output, ...);
> > }
> 
> print_running has 6 callers. run != ena is only needed
> for two of them. So I don't think it makes sense to do.

Those 6 are from print_aggr(), print_counter_aggr() and
print_counter().  They all have two branch - one is for no-scaling or
not-supported counter (I guess run or ena being 0 goes to this case),
another is scaling case - so IMHO print_counter_aggr() should check
the run and the ena in this case too.

The former can call print_running() to print empty column to CSV and
discard normal (scaling) output.  The latter also can call
print_running() to print for both output.

So by using print_running(), we can enforce same check to all cases
and reduce code duplication also IMHO.

Thanks,
Namhyung

> 
> -Andi
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