linux-kernel - Re: [PATCH 07/12] perf hists browser: Allow passing an initial hotkey

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Date:   Wed, 18 Dec 2019 09:08:18 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 07/12] perf hists browser: Allow passing an initial hotkey

On Tue, Dec 17, 2019 at 11:48:23AM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index 6dfdd8d5a743..3b7af5a8d101 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -673,9 +673,8 @@ static int hist_browser__title(struct hist_browser *browser, char *bf, size_t si
>  }
>  
>  int hist_browser__run(struct hist_browser *browser, const char *help,
> -		      bool warn_lost_event)
> +		      bool warn_lost_event, int key)
>  {
> -	int key;
>  	char title[160];
>  	struct hist_browser_timer *hbt = browser->hbt;
>  	int delay_secs = hbt ? hbt->refresh : 0;
> @@ -688,9 +687,12 @@ int hist_browser__run(struct hist_browser *browser, const char *help,
>  	if (ui_browser__show(&browser->b, title, "%s", help) < 0)
>  		return -1;
>  
> +	if (key)
> +		goto do_hotkey;
> +
>  	while (1) {
>  		key = ui_browser__run(&browser->b, delay_secs);
> -
> +do_hotkey:

or we could switch the 'swtich' and ui_browser__run, and get rid of the goto, like:

	while (1) {
  		switch (key) {
		...
		}

		key = ui_browser__run(&browser->b, delay_secs);
	}

jirka

>  		switch (key) {
>  		case K_TIMER: {
>  			u64 nr_entries;
> @@ -2994,8 +2996,7 @@ static int perf_evsel__hists_browse(struct evsel *evsel, int nr_events,
>  
>  		nr_options = 0;
>  
> -		key = hist_browser__run(browser, helpline,
> -					warn_lost_event);
> +		key = hist_browser__run(browser, helpline, warn_lost_event, 0);
>  
>  		if (browser->he_selection != NULL) {
>  			thread = hist_browser__selected_thread(browser);
> @@ -3573,7 +3574,7 @@ int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
>  	memset(&action, 0, sizeof(action));
>  
>  	while (1) {
> -		key = hist_browser__run(browser, "? - help", true);
> +		key = hist_browser__run(browser, "? - help", true, 0);
>  
>  		switch (key) {
>  		case 'q':
> diff --git a/tools/perf/ui/browsers/hists.h b/tools/perf/ui/browsers/hists.h
> index 078f2f2c7abd..1e938d9ffa5e 100644
> --- a/tools/perf/ui/browsers/hists.h
> +++ b/tools/perf/ui/browsers/hists.h
> @@ -34,7 +34,7 @@ struct hist_browser {
>  struct hist_browser *hist_browser__new(struct hists *hists);
>  void hist_browser__delete(struct hist_browser *browser);
>  int hist_browser__run(struct hist_browser *browser, const char *help,
> -		      bool warn_lost_event);
> +		      bool warn_lost_event, int key);
>  void hist_browser__init(struct hist_browser *browser,
>  			struct hists *hists);
>  #endif /* _PERF_UI_BROWSER_HISTS_H_ */
> -- 
> 2.21.0
>