[PATCH 09/10] perf tools: Make 'trace' sort key default for tracepoint events

[Namhyung Kim <namhyung@kernel.org>]

When an evlist contains tracepoint events only, use 'trace' sort key as
default.  This will make users more convenient to see trace result.

Suggested-by: Jiri Olsa <jolsa@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/sort.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index f38a0577967a..43cb9b638718 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2067,7 +2067,7 @@ static int sort_dimension__add(const char *tok,
 	return -ESRCH;
 }
 
-static const char *get_default_sort_order(void)
+static const char *get_default_sort_order(struct perf_evlist *evlist)
 {
 	const char *default_sort_orders[] = {
 		default_sort_order,
@@ -2076,13 +2076,25 @@ static const char *get_default_sort_order(void)
 		default_top_sort_order,
 		default_diff_sort_order,
 	};
+	bool use_trace = true;
+	struct perf_evsel *evsel;
 
 	BUG_ON(sort__mode >= ARRAY_SIZE(default_sort_orders));
 
+	evlist__for_each(evlist, evsel) {
+		if (evsel->attr.type != PERF_TYPE_TRACEPOINT) {
+			use_trace = false;
+			break;
+		}
+	}
+
+	if (use_trace)
+		return "trace";
+
 	return default_sort_orders[sort__mode];
 }
 
-static int setup_sort_order(void)
+static int setup_sort_order(struct perf_evlist *evlist)
 {
 	char *new_sort_order;
 
@@ -2103,7 +2115,7 @@ static int setup_sort_order(void)
 	 * because it's checked over the rest of the code.
 	 */
 	if (asprintf(&new_sort_order, "%s,%s",
-		     get_default_sort_order(), sort_order + 1) < 0) {
+		     get_default_sort_order(evlist), sort_order + 1) < 0) {
 		error("Not enough memory to set up --sort");
 		return -ENOMEM;
 	}
@@ -2118,7 +2130,7 @@ static int __setup_sorting(struct perf_evlist *evlist)
 	const char *sort_keys;
 	int ret = 0;
 
-	ret = setup_sort_order();
+	ret = setup_sort_order(evlist);
 	if (ret)
 		return ret;
 
@@ -2132,7 +2144,7 @@ static int __setup_sorting(struct perf_evlist *evlist)
 			return 0;
 		}
 
-		sort_keys = get_default_sort_order();
+		sort_keys = get_default_sort_order(evlist);
 	}
 
 	str = strdup(sort_keys);
-- 
2.6.4