[PATCH V2 1/2] perf tools: fix id pos in perf_evlist__open()

[Adrian Hunter <adrian.hunter@intel.com>]

Ensure the id_pos is correct when perf_evlist__open()
is used.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/evlist.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index b8727ae..005c0eb 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -64,6 +64,16 @@ void perf_evlist__set_id_pos(struct perf_evlist *evlist)
 	evlist->is_pos = first->is_pos;
 }
 
+static void perf_evlist__update_id_pos(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel;
+
+	list_for_each_entry(evsel, &evlist->entries, node)
+		perf_evsel__calc_id_pos(evsel);
+
+	perf_evlist__set_id_pos(evlist);
+}
+
 static void perf_evlist__purge(struct perf_evlist *evlist)
 {
 	struct perf_evsel *pos, *n;
@@ -915,6 +925,8 @@ int perf_evlist__open(struct perf_evlist *evlist)
 	struct perf_evsel *evsel;
 	int err;
 
+	perf_evlist__update_id_pos(evlist);
+
 	list_for_each_entry(evsel, &evlist->entries, node) {
 		err = perf_evsel__open(evsel, evlist->cpus, evlist->threads);
 		if (err < 0)
-- 
1.7.11.7