[PATCH] perf sort: only insert overhead && overhead_children when no overhead* field given

[changbin . du]

From: Changbin Du <changbin.du@xxxxxxxxx>

If we always insert 'overhead' and 'overhead_children' as sort keys,
this make it impossible to sort as overhead (which displayed as Self)
first. This patch forbid adding any overhead* field if there is one
already given.

Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
---
 tools/perf/util/sort.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index b6db140..7695b54 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2543,6 +2543,13 @@ static char *setup_overhead(char *keys)
 	if (sort__mode == SORT_MODE__DIFF)
 		return keys;
 
+	/*
+	 * Only insert overhead && overhead_children when
+	 * no overhead* field given.
+	 */
+	if (strstr(keys, "overhead"))
+		return keys;
+
 	keys = prefix_if_not_in("overhead", keys);
 
 	if (symbol_conf.cumulate_callchain)
-- 
2.7.4