linux-kernel - Re: [PATCH v2 3/5] perf diff: generalize hpp__color

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Date:	Tue, 26 Nov 2013 13:01:23 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Ramkumar Ramachandra <artagnon@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH v2 3/5] perf diff: generalize hpp__color_delta for -c

On Sun, Nov 24, 2013 at 11:50:23AM +0530, Ramkumar Ramachandra wrote:
> Generalize the function so that we can accommodate all three comparison
> methods: delta, ratio, and wdiff.
> 
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Signed-off-by: Ramkumar Ramachandra <artagnon@...il.com>
> ---
>  tools/perf/builtin-diff.c | 47 +++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 37 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
> index 84d5f2d..a54736c 100644
> --- a/tools/perf/builtin-diff.c
> +++ b/tools/perf/builtin-diff.c
> @@ -769,33 +769,60 @@ static int hpp__entry_baseline(struct hist_entry *he, char *buf, size_t size)
>  	return ret;
>  }
>  
> -static int hpp__color_delta(struct perf_hpp_fmt *fmt,
> -			struct perf_hpp *hpp, struct hist_entry *he)
> +static int __hpp__color_compare(struct perf_hpp_fmt *fmt,
> +				struct perf_hpp *hpp, struct hist_entry *he,
> +				int comparison_method)
>  {
>  	struct diff_hpp_fmt *dfmt =
>  		container_of(fmt, struct diff_hpp_fmt, fmt);
>  	struct hist_entry *pair = get_pair_fmt(he, dfmt);
> -	double percent;
> +	double delta;
>  	char pfmt[20] = " ";
>  
>  	if (!pair)
>  		goto dummy_print;
>  	if (pair->diff.computed)
> -		percent = pair->diff.period_ratio_delta;
> +		switch (comparison_method) {
> +		case COMPUTE_DELTA:
> +			delta = pair->diff.period_ratio_delta;
> +			break;
> +		default:
> +			BUG_ON(1);
> +		}
>  	else
> -		percent = compute_delta(he, pair);
> +		switch (comparison_method) {
> +		case COMPUTE_DELTA:
> +			delta = compute_delta(he, pair);
> +			break;
> +		default:
> +			BUG_ON(1);
> +		}
>  
> -	if (!he->dummy && fabs(percent) >= 0.01) {
> -		scnprintf(pfmt, 20, "%%%+d.2f%%%%", dfmt->header_width - 1);
> -		return color_snprintf(hpp->buf, hpp->size,
> -				percent > 0 ? PERF_COLOR_GREEN : PERF_COLOR_RED,
> -				pfmt, percent);
> +	if (!he->dummy) {

isn't this check superfluous because of the above (!pair) check?

jirka
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