linux-kernel - Re: [PATCH] perf top: Move toggling event logic into hists browser

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Date:	Mon, 22 Jun 2015 11:19:16 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH] perf top: Move toggling event logic into hists browser

Em Sun, Jun 21, 2015 at 12:41:16PM +0900, Namhyung Kim escreveu:
> Current 'f' key action to enable/disable events won't work if there're
> more than one event since perf_evsel_menu__run() doesn't return the key.
> So move it to the hists browser loop so that it can be processed as like
> other key action, and it's more natural to handle it there IMHO.

Yeah, at first I did it to try to remove references to whatever tool is
using the hists browser, i.e. it should not know it is being called from
something called 'top' or 'report' or something altogether different :-\

But yeah, your patch fixes the issue when we have multiple events, I am
applying, but what sounds better is to make those is_foo_tool_browser()
layering violations be something more abstract like hb->dynamic_mode,
avoid accesses to evlist in perf_evsel__ prefixed functions and have the
menu routine handle the 'f' hotkey.

Thanks!

- Arnaldo
 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/builtin-top.c       | 24 +++---------------------
>  tools/perf/ui/browsers/hists.c | 19 +++++++++++++++++--
>  2 files changed, 20 insertions(+), 23 deletions(-)
> 
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index 619a8696fda7..ecf319728f25 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -586,27 +586,9 @@ static void *display_thread_tui(void *arg)
>  		hists->uid_filter_str = top->record_opts.target.uid_str;
>  	}
>  
> -	while (true)  {
> -		int key = perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
> -							top->min_percent,
> -							&top->session->header.env);
> -
> -		if (key != 'f')
> -			break;
> -
> -		perf_evlist__toggle_enable(top->evlist);
> -		/*
> -		 * No need to refresh, resort/decay histogram entries
> -		 * if we are not collecting samples:
> -		 */
> -		if (top->evlist->enabled) {
> -			hbt.refresh = top->delay_secs;
> -			help = "Press 'f' to disable the events or 'h' to see other hotkeys";
> -		} else {
> -			help = "Press 'f' again to re-enable the events";
> -			hbt.refresh = 0;
> -		}
> -	}
> +	perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
> +				      top->min_percent,
> +				      &top->session->header.env);
>  
>  	done = 1;
>  	return NULL;
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index c42adb600091..7629bef2fd79 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -1902,8 +1902,23 @@ static int perf_evsel__hists_browse(struct perf_evsel *evsel, int nr_events,
>  		case CTRL('c'):
>  			goto out_free_stack;
>  		case 'f':
> -			if (!is_report_browser(hbt))
> -				goto out_free_stack;
> +			if (!is_report_browser(hbt)) {
> +				struct perf_top *top = hbt->arg;
> +
> +				perf_evlist__toggle_enable(top->evlist);
> +				/*
> +				 * No need to refresh, resort/decay histogram
> +				 * entries if we are not collecting samples:
> +				 */
> +				if (top->evlist->enabled) {
> +					helpline = "Press 'f' to disable the events or 'h' to see other hotkeys";
> +					hbt->refresh = delay_secs;
> +				} else {
> +					helpline = "Press 'f' again to re-enable the events";
> +					hbt->refresh = 0;
> +				}
> +				continue;
> +			}
>  			/* Fall thru */
>  		default:
>  			helpline = "Press '?' for help on key bindings";
> -- 
> 2.4.4
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