linux-kernel - Re: [PATCH resend] perf top: Add a visual cue for toggle zeroing of samples

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Date:	Wed, 08 Oct 2014 09:48:48 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Taeung Song <treeze.taeung@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH resend] perf top: Add a visual cue for toggle zeroing of samples

Hi Taeung,

On Tue,  7 Oct 2014 16:13:15 +0900, Taeung Song wrote:
> When 'perf top' is run, one can't easily find a difference
> between -z option and normal output.
> So I added a visual cue to know whether it is the zeroing or not.
>
> Output is as below.
>
> Before:
>  $ perf top
>
>  Samples: 61K of event 'cycles', Event count (approx.): 3908136933
>  Overhead  Shared Object                       Symbol
>     1.42%  firefox                             [.] 0x0000000000011e76
>     1.32%  libpthread-2.17.so                  [.] pthread_mutex_lock
>
> If you press key 'z' or run with zero option like '$ perf top --zero', it is as below.
>
> After:
>  Samples: 61K of event 'cycles', Event count (approx.): 3908136933 [z]
>  Overhead  Shared Object                       Symbol
>     1.42%  firefox                             [.] 0x0000000000011e76
>     1.32%  libpthread-2.17.so                  [.] pthread_mutex_lock
>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
>  tools/perf/ui/browsers/hists.c | 32 ++++++++++++++++++++++----------
>  1 file changed, 22 insertions(+), 10 deletions(-)
>
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index 8f60a97..79b66d0 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -35,7 +35,9 @@ struct hist_browser {
>  
>  extern void hist_browser__init_hpp(void);
>  
> -static int hists__browser_title(struct hists *hists, char *bf, size_t size);
> +static int hists__browser_title(struct hists *hists,
> +				struct hist_browser_timer *hbt,
> +				char *bf, size_t size);
>  static void hist_browser__update_nr_entries(struct hist_browser *hb);
>  
>  static struct rb_node *hists__filter_entries(struct rb_node *nd,
> @@ -390,7 +392,7 @@ static int hist_browser__run(struct hist_browser *browser,
>  	browser->b.entries = &browser->hists->entries;
>  	browser->b.nr_entries = hist_browser__nr_entries(browser);
>  
> -	hists__browser_title(browser->hists, title, sizeof(title));
> +	hists__browser_title(browser->hists, hbt, title, sizeof(title));
>  
>  	if (ui_browser__show(&browser->b, title,
>  			     "Press '?' for help on key bindings") < 0)
> @@ -417,7 +419,8 @@ static int hist_browser__run(struct hist_browser *browser,
>  				ui_browser__warn_lost_events(&browser->b);
>  			}
>  
> -			hists__browser_title(browser->hists, title, sizeof(title));
> +			hists__browser_title(browser->hists,
> +					     hbt, title, sizeof(title));
>  			ui_browser__show_title(&browser->b, title);
>  			continue;
>  		}
> @@ -1204,7 +1207,15 @@ static struct thread *hist_browser__selected_thread(struct hist_browser *browser
>  	return browser->he_selection->thread;
>  }
>  
> -static int hists__browser_title(struct hists *hists, char *bf, size_t size)
> +/* Check whether the browser is for 'top' or 'report' */
> +static inline bool is_report_browser(void *timer)
> +{
> +	return timer == NULL;
> +}
> +
> +static int hists__browser_title(struct hists *hists,
> +				struct hist_browser_timer *hbt,
> +				char *bf, size_t size)
>  {
>  	char unit;
>  	int printed;
> @@ -1256,6 +1267,13 @@ static int hists__browser_title(struct hists *hists, char *bf, size_t size)
>  	if (dso)
>  		printed += scnprintf(bf + printed, size - printed,
>  				    ", DSO: %s", dso->short_name);
> +	if (!is_report_browser(hbt)) {
> +		struct perf_top *top = hbt->arg;
> +
> +		if (top->zero)
> +			printed += scnprintf(bf + printed, size - printed, " [z]");
> +	}
> +
>  	return printed;
>  }
>  
> @@ -1267,12 +1285,6 @@ static inline void free_popup_options(char **options, int n)
>  		zfree(&options[i]);
>  }
>  
> -/* Check whether the browser is for 'top' or 'report' */
> -static inline bool is_report_browser(void *timer)
> -{
> -	return timer == NULL;
> -}
> -
>  /*
>   * Only runtime switching of perf data file will make "input_name" point
>   * to a malloced buffer. So add "is_input_name_malloced" flag to decide
--
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