[v6,05/10] perf evlist: Change perf_evlist__splice_list_tail() ordering

Commit Message

John Garry Dec. 4, 2020, 11:10 a.m. UTC

Function find_evsel_group() expects events to be ordered such that they
are grouped after their leader.

Modify perf_evlist__splice_list_tail() to guarantee this (ordering).

[Should prob also change the function name]

Signed-off-by: John Garry <[e-mail]>
Acked-by: Kajol Jain <[e-mail]>
---
 tools/perf/util/evlist.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

Patch

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 8bdf3d2c907c..b7e4e6d85d59 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -180,11 +180,22 @@  void evlist__remove(struct evlist *evlist, struct evsel *evsel)
 void perf_evlist__splice_list_tail(struct evlist *evlist,
 				   struct list_head *list)
 {
-	struct evsel *evsel, *temp;
+	while (!list_empty(list)) {
+		struct evsel *evsel, *temp, *leader = NULL;
 
-	__evlist__for_each_entry_safe(list, temp, evsel) {
-		list_del_init(&evsel->core.node);
-		evlist__add(evlist, evsel);
+		__evlist__for_each_entry_safe(list, temp, evsel) {
+			list_del_init(&evsel->core.node);
+			evlist__add(evlist, evsel);
+			leader = evsel;
+			break;
+		}
+
+		__evlist__for_each_entry_safe(list, temp, evsel) {
+			if (evsel->leader == leader) {
+				list_del_init(&evsel->core.node);
+				evlist__add(evlist, evsel);
+			}
+		}
 	}
 }