perf annotate browser: Use -> to navigate on assembly lines

And add better explanations when the line isn't actionable, like non
assembly lines and on other instructions.

Suggested-by: Ingo Molnar <mingo@elte.hu>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-375n844b5wra7lgq08ou153j@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 21 insertions, 6 deletions

diff --git a/tools/perf/util/ui/browsers/annotate.c b/tools/perf/util/ui/browsers/annotate.c
index 77421bab8fdd..674b55e686fd 100644
--- a/tools/perf/util/ui/browsers/annotate.c
+++ b/tools/perf/util/ui/browsers/annotate.c
@@ -184,8 +184,8 @@ static int annotate_browser__run(struct annotate_browser *self, int evidx,
         int key;
 
         if (ui_browser__show(&self->b, sym->name,
-                             "<-, -> or ESC: exit, TAB/shift+TAB: "
-                             "cycle hottest lines, H: Hottest") < 0)
+                             "<- or ESC: exit, TAB/shift+TAB: "
+                             "cycle hottest lines, H: Hottest, -> Line action") < 0)
                 return -1;
 
         ui_browser__add_exit_keys(&self->b, exit_keys);
@@ -245,24 +245,39 @@ static int annotate_browser__run(struct annotate_browser *self, int evidx,
                         nd = self->curr_hot;
                         break;
                 case NEWT_KEY_ENTER:
-                        if (self->selection != NULL) {
+                case NEWT_KEY_RIGHT:
+                        if (self->selection == NULL) {
+                                ui_helpline__puts("Huh? No selection. Report to linux-kernel@vger.kernel.org");
+                                continue;
+                        }
+
+                        if (self->selection->offset == -1) {
+                                ui_helpline__puts("Actions are only available for assembly lines.");
+                                continue;
+                        } else {
                                 char *s = strstr(self->selection->line, "callq ");
                                 struct annotation *notes;
                                 struct symbol *target;
                                 u64 ip;
 
-                                if (s == NULL)
+                                if (s == NULL) {
+                                        ui_helpline__puts("Actions are only available for the 'callq' instruction.");
                                         continue;
+                                }
 
                                 s = strchr(s, ' ');
-                                if (s++ == NULL)
+                                if (s++ == NULL) {
+                                        ui_helpline__puts("Invallid callq instruction.");
                                         continue;
+                                }
 
                                 ip = strtoull(s, NULL, 16);
                                 ip = ms->map->map_ip(ms->map, ip);
                                 target = map__find_symbol(ms->map, ip, NULL);
-                                if (target == NULL)
+                                if (target == NULL) {
+                                        ui_helpline__puts("The called function was not found.");
                                         continue;
+                                }
 
                                 notes = symbol__annotation(target);
                                 pthread_mutex_lock(&notes->lock);