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 | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index dcedfe00f04d..e60c6bb32d92 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;
 	struct annotation_options annotation_opts;
@@ -171,7 +172,7 @@ 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) {
@@ -323,10 +324,19 @@ static int process_sample_event(struct perf_tool *tool,
 	if (al.map != NULL)
 		map__dso(al.map)->hit = 1;
 
-	if (ui__has_annotation() || rep->symbol_ipc || rep->total_cycles_mode) {
+	if (ui__has_annotation() || rep->symbol_ipc || rep->total_cycles_mode ||
+	    rep->data_type) {
 		hist__account_cycles(sample->branch_stack, &al, sample,
 				     rep->nonany_branch_mode,
 				     &rep->total_cycles);
+		if (rep->data_type) {
+			struct symbol *sym = al.sym;
+			struct annotation *notes = sym ? symbol__annotation(sym) : NULL;
+
+			/* XXX: Save annotate options here */
+			if (notes)
+				notes->options = &rep->annotation_opts;
+		}
 	}
 
 	ret = hist_entry_iter__add(&iter, &al, rep->max_stack, rep);
@@ -1600,6 +1610,9 @@ int cmd_report(int argc, const char **argv)
 			sort_order = NULL;
 	}
 
+	if (sort_order && strstr(sort_order, "type"))
+		report.data_type = true;
+
 	if (strcmp(input_name, "-") != 0)
 		setup_browser(true);
 	else
@@ -1658,7 +1671,7 @@ 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)
-- 
2.42.0.655.g421f12c284-goog