[PATCH 3/3] perf annotate-data: Show first-level children by default in TUI

[Namhyung Kim]

Now default is to fold everything but it only shows the name of the
top-level data type which is not very useful.  Instead just expand the
top level entry so that it can show the layout at a higher level.

  Annotate type: 'struct task_struct' (4 samples)
        Percent     Offset       Size  Field
  -      100.00          0       9792  struct task_struct {                           ◆
  +        0.50          0         24      struct thread_info     thread_info;        ▒
           0.00         24          4      unsigned int   __state;                    ▒
           0.00         32          8      void*  stack;                              ▒
  +        0.00         40          4      refcount_t     usage;                      ▒
           0.00         44          4      unsigned int   flags;                      ▒
           0.00         48          4      unsigned int   ptrace;                     ▒
           0.00         52          4      int    on_cpu;                             ▒
  +        0.00         56         16      struct __call_single_node      wake_entry; ▒
           0.00         72          4      unsigned int   wakee_flips;                ▒
           0.00         80          8      long unsigned int      wakee_flip_decay_ts;▒
           0.00         88          8      struct task_struct*    last_wakee;         ▒
           0.00         96          4      int    recent_used_cpu;                    ▒
           0.00        100          4      int    wake_cpu;                           ▒
           0.00        104          4      int    on_rq;                              ▒
           0.00        108          4      int    prio;                               ▒
           0.00        112          4      int    static_prio;                        ▒
           0.00        116          4      int    normal_prio;                        ▒
           0.00        120          4      unsigned int   rt_priority;                ▒
  +        0.00        128        256      struct sched_entity    se;                 ▒
  +        0.00        384         48      struct sched_rt_entity rt;                 ▒
  +        0.00        432        224      struct sched_dl_entity dl;                 ▒
           0.00        656          8      struct sched_class*    sched_class;        ▒
  ...

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/ui/browsers/annotate-data.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/tools/perf/ui/browsers/annotate-data.c b/tools/perf/ui/browsers/annotate-data.c
index a5c5ad63425e..f563a3bb072c 100644
--- a/tools/perf/ui/browsers/annotate-data.c
+++ b/tools/perf/ui/browsers/annotate-data.c
@@ -596,9 +596,17 @@ int hist_entry__annotate_data_tui(struct hist_entry *he, struct evsel *evsel,
 	}
 
 	ret = annotated_data_browser__collect_entries(&browser);
-	if (ret == 0)
-		ret = annotated_data_browser__run(&browser, evsel, hbt);
+	if (ret < 0)
+		goto out;
 
+	/* To get the top and current entry */
+	browser__refresh(&browser.b);
+	/* Show the first-level child entries by default */
+	annotated_data_browser__toggle_fold(&browser, /*recursive=*/false);
+
+	ret = annotated_data_browser__run(&browser, evsel, hbt);
+
+out:
 	annotated_data_browser__delete_entries(&browser);
 
 	return ret;
-- 
2.46.0.76.ge559c4bf1a-goog