perf report: Support multiple events on the TUI

The hists__tty_browse_tree function was created with the loop to print
all events, and its equivalent, hists__tui_browse_tree, was created in a
similar fashion, where it is possible to switch among the multiple
events, if present, using TAB to go the next event, and shift+TAB
(UNTAB) to go to the previous.

The report TUI now shows as the window title the name of the event and a
leak was fixed wrt pstacks.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 108 insertions, 40 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index a7b8760e401c..359205782964 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -288,6 +288,38 @@ static size_t hists__fprintf_nr_sample_events(struct hists *self,
         return ret + fprintf(fp, "\n#\n");
 }
 
+static int hists__tty_browse_tree(struct rb_root *tree, const char *help)
+{
+        struct rb_node *next = rb_first(tree);
+
+        while (next) {
+                struct hists *hists = rb_entry(next, struct hists, rb_node);
+                const char *evname = NULL;
+
+                if (rb_first(&hists->entries) != rb_last(&hists->entries))
+                        evname = __event_name(hists->type, hists->config);
+
+                hists__fprintf_nr_sample_events(hists, evname, stdout);
+                hists__fprintf(hists, NULL, false, stdout);
+                fprintf(stdout, "\n\n");
+                next = rb_next(&hists->rb_node);
+        }
+
+        if (sort_order == default_sort_order &&
+            parent_pattern == default_parent_pattern) {
+                fprintf(stdout, "#\n# (%s)\n#\n", help);
+
+                if (show_threads) {
+                        bool style = !strcmp(pretty_printing_style, "raw");
+                        perf_read_values_display(stdout, &show_threads_values,
+                                                 style);
+                        perf_read_values_destroy(&show_threads_values);
+                }
+        }
+
+        return 0;
+}
+
 static int __cmd_report(void)
 {
         int ret = -EINVAL;
@@ -330,34 +362,14 @@ static int __cmd_report(void)
                 hists = rb_entry(next, struct hists, rb_node);
                 hists__collapse_resort(hists);
                 hists__output_resort(hists);
-                if (use_browser > 0)
-                        hists__browse(hists, help, input_name);
-                else {
-                        const char *evname = NULL;
-                        if (rb_first(&session->hists.entries) !=
-                            rb_last(&session->hists.entries))
-                                evname = __event_name(hists->type, hists->config);
-
-                        hists__fprintf_nr_sample_events(hists, evname, stdout);
-
-                        hists__fprintf(hists, NULL, false, stdout);
-                        fprintf(stdout, "\n\n");
-                }
-
                 next = rb_next(&hists->rb_node);
         }
 
-        if (use_browser <= 0 && sort_order == default_sort_order &&
-            parent_pattern == default_parent_pattern) {
-                fprintf(stdout, "#\n# (%s)\n#\n", help);
+        if (use_browser > 0)
+                hists__tui_browse_tree(&session->hists_tree, help);
+        else
+                hists__tty_browse_tree(&session->hists_tree, help);
 
-                if (show_threads) {
-                        bool style = !strcmp(pretty_printing_style, "raw");
-                        perf_read_values_display(stdout, &show_threads_values,
-                                                 style);
-                        perf_read_values_destroy(&show_threads_values);
-                }
-        }
 out_delete:
         perf_session__delete(session);
         return ret;
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 2d5203fedb20..83fa33a7b38b 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -98,10 +98,17 @@ void hists__filter_by_thread(struct hists *self, const struct thread *thread);
 #ifdef NO_NEWT_SUPPORT
 static inline int hists__browse(struct hists *self __used,
                                 const char *helpline __used,
-                                const char *input_name __used)
+                                const char *ev_name __used)
 {
         return 0;
 }
+
+static inline int hists__tui_browse_tree(struct rb_root *self __used,
+                                         const char *help __used)
+{
+        return 0;
+}
+
 static inline int hist_entry__tui_annotate(struct hist_entry *self __used)
 {
         return 0;
@@ -111,9 +118,12 @@ static inline int hist_entry__tui_annotate(struct hist_entry *self __used)
 #else
 #include <newt.h>
 int hists__browse(struct hists *self, const char *helpline,
-                  const char *input_name);
+                  const char *ev_name);
 int hist_entry__tui_annotate(struct hist_entry *self);
+
 #define KEY_LEFT NEWT_KEY_LEFT
 #define KEY_RIGHT NEWT_KEY_RIGHT
+
+int hists__tui_browse_tree(struct rb_root *self, const char *help);
 #endif
 #endif  /* __PERF_HIST_H */
diff --git a/tools/perf/util/newt.c b/tools/perf/util/newt.c
index ffd04720b754..d54c540f49db 100644
--- a/tools/perf/util/newt.c
+++ b/tools/perf/util/newt.c
@@ -842,6 +842,8 @@ static int hist_browser__populate(struct hist_browser *self, struct hists *hists
         newtFormAddHotKey(self->form, 'h');
         newtFormAddHotKey(self->form, NEWT_KEY_F1);
         newtFormAddHotKey(self->form, NEWT_KEY_RIGHT);
+        newtFormAddHotKey(self->form, NEWT_KEY_TAB);
+        newtFormAddHotKey(self->form, NEWT_KEY_UNTAB);
         newtFormAddComponents(self->form, self->tree, NULL);
         self->selection = newt__symbol_tree_get_current(self->tree);
 
@@ -873,7 +875,7 @@ static struct thread *hist_browser__selected_thread(struct hist_browser *self)
         return he ? he->thread : NULL;
 }
 
-static int hist_browser__title(char *bf, size_t size, const char *input_name,
+static int hist_browser__title(char *bf, size_t size, const char *ev_name,
                                const struct dso *dso, const struct thread *thread)
 {
         int printed = 0;
@@ -887,18 +889,18 @@ static int hist_browser__title(char *bf, size_t size, const char *input_name,
                 printed += snprintf(bf + printed, size - printed,
                                     "%sDSO: %s", thread ? " " : "",
                                     dso->short_name);
-        return printed ?: snprintf(bf, size, "Report: %s", input_name);
+        return printed ?: snprintf(bf, size, "Event: %s", ev_name);
 }
 
-int hists__browse(struct hists *self, const char *helpline, const char *input_name)
+int hists__browse(struct hists *self, const char *helpline, const char *ev_name)
 {
         struct hist_browser *browser = hist_browser__new();
-        struct pstack *fstack = pstack__new(2);
+        struct pstack *fstack;
         const struct thread *thread_filter = NULL;
         const struct dso *dso_filter = NULL;
         struct newtExitStruct es;
         char msg[160];
-        int err = -1;
+        int key = -1;
 
         if (browser == NULL)
                 return -1;
@@ -909,7 +911,7 @@ int hists__browse(struct hists *self, const char *helpline, const char *input_na
 
         ui_helpline__push(helpline);