Enable type annotation when the 'type' sort key is used.
It shows type of variables the samples access at the moment.
Users can see which types are accessed frequently.

  $ perf report -s dso,type --stdio
  ...
  # Overhead  Shared Object      Data Type
  # ........  .................  .........
  #
      35.47%  [kernel.kallsyms]  (unknown)
       1.62%  [kernel.kallsyms]  struct sched_entry
       1.23%  [kernel.kallsyms]  struct cfs_rq
       0.83%  [kernel.kallsyms]  struct task_struct
       0.34%  [kernel.kallsyms]  struct list_head
       0.30%  [kernel.kallsyms]  struct mem_cgroup
  ...

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/builtin-report.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 17fb171e898b..ed76152c8db8 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -96,6 +96,7 @@ struct report {
 	bool			stitch_lbr;
 	bool			disable_order;
 	bool			skip_empty;
+	bool			data_type;
 	int			max_stack;
 	struct perf_read_values	show_threads_values;
 	const char		*pretty_printing_style;
@@ -170,7 +171,7 @@ static int hist_iter__report_callback(struct hist_entry_iter *iter,
 	struct mem_info *mi;
 	struct branch_info *bi;
 
-	if (!ui__has_annotation() && !rep->symbol_ipc)
+	if (!ui__has_annotation() && !rep->symbol_ipc && !rep->data_type)
 		return 0;
 
 	if (sort__mode == SORT_MODE__BRANCH) {
@@ -1619,6 +1620,16 @@ int cmd_report(int argc, const char **argv)
 			sort_order = NULL;
 	}
 
+	if (sort_order && strstr(sort_order, "type")) {
+		report.data_type = true;
+		annotate_opts.annotate_src = false;
+
+#ifndef HAVE_DWARF_GETLOCATIONS_SUPPORT
+		pr_err("Error: Data type profiling is disabled due to missing DWARF support\n");
+		goto error;
+#endif
+	}
+
 	if (strcmp(input_name, "-") != 0)
 		setup_browser(true);
 	else
@@ -1677,7 +1688,7 @@ int cmd_report(int argc, const char **argv)
 	 * so don't allocate extra space that won't be used in the stdio
 	 * implementation.
 	 */
-	if (ui__has_annotation() || report.symbol_ipc ||
+	if (ui__has_annotation() || report.symbol_ipc || report.data_type ||
 	    report.total_cycles_mode) {
 		ret = symbol__annotation_init();
 		if (ret < 0)
-- 
2.43.0.472.g3155946c3a-goog