linux-kernel - Re: [PATCH 07/17] perf ui/stdio: Align column header for hierarchy output

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Date:	Wed, 20 Jan 2016 19:40:43 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 07/17] perf ui/stdio: Align column header for hierarchy
 output

Em Sun, Jan 17, 2016 at 01:03:07AM +0900, Namhyung Kim escreveu:
> The hierarchy output mode is to group entries so the existing columns
> won't fit to the new output.  Treat all sort keys as a single column and
> separate headers by "/".
> 
>   #    Overhead  Command / Shared Object
>   # ...........  ................................
>   #
>       15.11%     swapper
>          14.97%     [kernel.vmlinux]
>           0.09%     [libahci]
>           0.05%     [iwlwifi]
>   ...
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/ui/stdio/hist.c | 107 +++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 107 insertions(+)
> 
> diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
> index 0cd7c651a0e8..38279478a06d 100644
> --- a/tools/perf/ui/stdio/hist.c
> +++ b/tools/perf/ui/stdio/hist.c
> @@ -502,6 +502,108 @@ static int hist_entry__fprintf(struct hist_entry *he, size_t size,
>  	return ret;
>  }
>  
> +static int print_hierarchy_indent(const char *sep, int nr_sort,
> +				  const char *line, FILE *fp)
> +{
> +	if (sep != NULL || nr_sort < 1)
> +		return 0;
> +
> +	return fprintf(fp, "%-.*s", (nr_sort - 1) * HIERARCHY_INDENT, line);
> +}
> +
> +static int print_hierarchy_header(struct hists *hists, struct perf_hpp *hpp,
> +				  const char *sep, FILE *fp)
> +{
> +	bool first = true;
> +	int nr_sort;
> +	unsigned width = 0;
> +	unsigned header_width = 0;
> +	struct perf_hpp_fmt *fmt;
> +	const char spaces[] = "                                               "
> +	"                                                                     "
> +	"                                                                     ";
> +	const char dots[] = "................................................."
> +	"....................................................................."
> +	".....................................................................";
> +
> +	nr_sort = perf_hpp__count_sort_keys();
> +
> +	/* preserve max indent depth for column headers */
> +	print_hierarchy_indent(sep, nr_sort, spaces, fp);
> +
> +	perf_hpp__for_each_format(fmt) {
> +		if (perf_hpp__is_sort_entry(fmt) || perf_hpp__is_dynamic_entry(fmt))
> +			break;
> +
> +		if (!first)
> +			fprintf(fp, "%s", sep ?: "  ");
> +		else
> +			first = false;
> +
> +		fmt->header(fmt, hpp, hists_to_evsel(hists));
> +		fprintf(fp, "%s", hpp->buf);

We already have code that prints dots or spaces according to a given
width, but in tools/perf/ui/stdio/hist.c hists__fprintf() it does it
using a fprintf loop, gack, would be better to settle in one way.

Can be done later, sure, processing as-is.

- Arnaldo

> +	}
> +
> +	/* combine sort headers with ' / ' */
> +	first = true;
> +	perf_hpp__for_each_format(fmt) {
> +		if (!perf_hpp__is_sort_entry(fmt) && !perf_hpp__is_dynamic_entry(fmt))
> +			continue;
> +
> +		if (!first)
> +			header_width += fprintf(fp, " / ");
> +		else {
> +			header_width += fprintf(fp, "%s", sep ?: "  ");
> +			first = false;
> +		}
> +
> +		fmt->header(fmt, hpp, hists_to_evsel(hists));
> +		rtrim(hpp->buf);
> +
> +		header_width += fprintf(fp, "%s", hpp->buf);
> +	}
> +
> +	/* preserve max indent depth for combined sort headers */
> +	print_hierarchy_indent(sep, nr_sort, spaces, fp);
> +
> +	fprintf(fp, "\n# ");
> +
> +	/* preserve max indent depth for initial dots */
> +	print_hierarchy_indent(sep, nr_sort, dots, fp);
> +
> +	first = true;
> +	perf_hpp__for_each_format(fmt) {
> +		if (perf_hpp__is_sort_entry(fmt) || perf_hpp__is_dynamic_entry(fmt))
> +			break;
> +
> +		if (!first)
> +			fprintf(fp, "%s", sep ?: "  ");
> +		else
> +			first = false;
> +
> +		width = fmt->width(fmt, hpp, hists_to_evsel(hists));
> +		fprintf(fp, "%.*s", width, dots);
> +	}
> +
> +	perf_hpp__for_each_format(fmt) {
> +		if (!perf_hpp__is_sort_entry(fmt) && !perf_hpp__is_dynamic_entry(fmt))
> +			continue;
> +
> +		width = fmt->width(fmt, hpp, hists_to_evsel(hists));
> +		if (width > header_width)
> +			header_width = width;
> +	}
> +
> +	fprintf(fp, "%s%-.*s", sep ?: "  ", header_width, dots);
> +
> +	/* preserve max indent depth for dots under sort headers */
> +	print_hierarchy_indent(sep, nr_sort, dots, fp);
> +
> +	fprintf(fp, "\n#\n");
> +
> +	return 2;
> +}
> +
>  size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
>  		      int max_cols, float min_pcnt, FILE *fp)
>  {
> @@ -533,6 +635,11 @@ size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
>  
>  	fprintf(fp, "# ");
>  
> +	if (symbol_conf.report_hierarchy) {
> +		nr_rows += print_hierarchy_header(hists, &dummy_hpp, sep, fp);
> +		goto print_entries;
> +	}
> +
>  	perf_hpp__for_each_format(fmt) {
>  		if (perf_hpp__should_skip(fmt, hists))
>  			continue;
> -- 
> 2.6.4