[PATCH 49/53] perf tools: Consider TAILSIZE bit when caclulate is_pos

[Wang Nan]

evsel->is_pos indicates event id location in a event (count backward).
It is used to find id for tracking events (mmap, exit...). If TAILSIZE
is selected, this location should be changed accordingly.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Signed-off-by: He Kuang <hekuang@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Zefan Li <lizefan@xxxxxxxxxx>
Cc: pi3orama@xxxxxxx
---
 tools/perf/util/evsel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 6932b8b..c59ea34 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -144,10 +144,10 @@ static int __perf_evsel__calc_id_pos(u64 sample_type)
  */
 static int __perf_evsel__calc_is_pos(u64 sample_type)
 {
-	int idx = 1;
+	int idx = 1 + (sample_type & PERF_SAMPLE_TAILSIZE ? 1 : 0);
 
 	if (sample_type & PERF_SAMPLE_IDENTIFIER)
-		return 1;
+		return idx;
 
 	if (!(sample_type & PERF_SAMPLE_ID))
 		return -1;
-- 
1.8.3.4