[PATCH 07/11] perf top: Tell the user how to unfreeze events after pressing 'f'

From: Arnaldo Carvalho de Melo
Date: Fri Jun 19 2015 - 17:59:19 EST

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

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@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-uhiswg9a9rxm5gxg7ptjskjn@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/perf/builtin-top.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index ccf569ab08aa..70a9505aae83 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -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;

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