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perf top: Tell the user how to unfreeze events after pressing 'f'

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When the user presses 'f' to disable events the visual cues are, well,
the percentages not changing and the number of events freezing.

Be more explicit by changing the help line at the bottom of the screen
to show the following messages when 'f' is pressed:

  "Press 'f' again to re-enable the events"

And then, when 'f' is pressed again:

  "Press 'f' to disable the events or 'h'

Suggested-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-uhiswg9a9rxm5gxg7ptjskjn@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-06-19 17:35:25 -03:00
parent 5f00b0f45b
commit ae3b6ab603
1 changed files with 7 additions and 1 deletions
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8
tools/perf/builtin-top.c
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@ -599,7 +599,13 @@ static void *display_thread_tui(void *arg)
* No need to refresh, resort/decay histogram entries
* if we are not collecting samples:
*/
hbt.refresh = top->evlist->enabled ? top->delay_secs : 0;
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;
}
}
done = 1;