Re: [PATCH 14/23] perf ui/stdio: Implement hierarchy output mode

[Jiri Olsa <jolsa@redhat.com>]

On Fri, Feb 05, 2016 at 10:01:46PM +0900, Namhyung Kim wrote:
> The hierarchy output mode is to group entries for each level so that
> user can see higher level picture more easily.  It also helps to find
> out which component is most costly.  The output will look like below:
> 
>       15.11%     swapper
>          14.97%     [kernel.vmlinux]
>           0.09%     [libahci]
>           0.05%     [iwlwifi]
>       10.29%     irq/33-iwlwifi
>           6.45%     [kernel.vmlinux]
>           1.41%     [mac80211]
>           1.15%     [iwldvm]
>           1.14%     [iwlwifi]
>           0.14%     [cfg80211]
>        4.81%     firefox
>           3.92%     libxul.so
>           0.34%     [kernel.vmlinux]
> 
> Acked-by: Pekka Enberg <penberg@kernel.org>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> ---
>  tools/perf/ui/hist.c       | 14 +++++++++
>  tools/perf/ui/stdio/hist.c | 77 +++++++++++++++++++++++++++++++++++++++++++++-
>  tools/perf/util/hist.h     |  4 +++
>  3 files changed, 94 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
> index 1ba4117d9c2d..c398ce288615 100644
> --- a/tools/perf/ui/hist.c
> +++ b/tools/perf/ui/hist.c
> @@ -687,3 +687,17 @@ void perf_hpp__set_user_width(const char *width_list_str)
>  			break;
>  	}
>  }
> +
> +int perf_hpp__count_sort_keys(void)
> +{
> +	int nr_sort = 0;
> +	struct perf_hpp_fmt *fmt;
> +
> +	perf_hpp_list__for_each_format(&perf_hpp_list, fmt) {
> +		if (perf_hpp__is_sort_entry(fmt) ||
> +		    perf_hpp__is_dynamic_entry(fmt))
> +			nr_sort++;
> +	}
> +
> +	return nr_sort;
> +}

hum, this seems expensive..  also we should do that
in generic way per perf_hpp_list struct

we could hold number of sort entries in struct perf_hpp_list
and count it in:
  perf_hpp_list__register_sort_field

thanks,
jirka