linux-kernel - Re: [PATCH v3 2/4] perf callchain: Abstract callchain print function

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Date:	Tue, 3 Nov 2015 09:40:55 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Kan Liang <kan.liang@...el.com>
Subject: Re: [PATCH v3 2/4] perf callchain: Abstract callchain print function

On Tue, Nov 03, 2015 at 04:18:29PM +0900, Namhyung Kim wrote:

SNIP

>  	while (rb_node) {
> -		double percent;
> -
>  		chain = rb_entry(rb_node, struct callchain_node, rb_node);
> -		percent = chain->hit * 100.0 / total_samples;
>  
> -		ret = percent_color_fprintf(fp, "           %6.2f%%\n", percent);
> +		ret += fprintf(fp, "           ");
> +		ret += callchain_node__fprintf_value(chain, fp, total_samples);
> +		ret += fprintf(fp, "\n");
>  		ret += __callchain__fprintf_flat(fp, chain, total_samples);
>  		ret += fprintf(fp, "\n");
>  		if (++entries_printed == callchain_param.print_limit)
> @@ -294,12 +294,11 @@ static size_t callchain__fprintf_folded(FILE *fp, struct rb_root *tree,
>  	struct rb_node *rb_node = rb_first(tree);
>  
>  	while (rb_node) {
> -		double percent;
>  
>  		chain = rb_entry(rb_node, struct callchain_node, rb_node);
> -		percent = chain->hit * 100.0 / total_samples;
>  
> -		ret += fprintf(fp, "%.2f%% ", percent);
> +		ret += callchain_node__fprintf_value(chain, fp, total_samples);
> +		ret += fprintf(fp, " ");

hum, the callchain_node__fprintf_value gets hits as callchain_cumul_hits(node)
which is 'node->hit + node->children_hit'

while the replaced code took only 'chain->hit'

not sure now which one we actualy want here..

jirka

>  		ret += __callchain__fprintf_folded(fp, chain);
>  		ret += fprintf(fp, "\n");
>  		if (++entries_printed == callchain_param.print_limit)
> diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> index 08cb220ba5ea..44184d198855 100644
> --- a/tools/perf/util/callchain.c
> +++ b/tools/perf/util/callchain.c
> @@ -805,6 +805,31 @@ char *callchain_list__sym_name(struct callchain_list *cl,
>  	return bf;
>  }
>  
> +char *callchain_node__sprintf_value(struct callchain_node *node,
> +				    char *bf, size_t bfsize, u64 total)
> +{
> +	double percent = 0.0;
> +	u64 cumul = callchain_cumul_hits(node);
> +
> +	if (total)
> +		percent = cumul * 100.0 / total;
> +
> +	scnprintf(bf, bfsize, "%6.2f%%", percent);
> +	return bf;
> +}
> +
> +int callchain_node__fprintf_value(struct callchain_node *node,
> +				 FILE *fp, u64 total)
> +{
> +	double percent = 0.0;
> +	u64 cumul = callchain_cumul_hits(node);
> +
> +	if (total)
> +		percent = cumul * 100.0 / total;
> +
> +	return percent_color_fprintf(fp, "%.2f%%", percent);
> +}

SNIP
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