path: root/tools/perf/builtin-stat.c
diff options
authorNamhyung Kim <namhyung.kim@lge.com>2012-03-16 17:42:19 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-03-16 16:13:45 -0300
commit4c19ea453d81cf8bd9bd446e6b129998f79997e7 (patch)
tree92b2bb388bc799beca967c150c9f838a8eab9522 /tools/perf/builtin-stat.c
parentperf tools: Add support to specify pmu style event (diff)
perf stat: Fix event grouping on forked task
When event group is enabled for forked task (i.e. no target task was specified) all events were disabled and marked ->enable_on_exec. However they are not counted at all since only group leader will be enabled on exec actually. So the result looked like below: $ ./perf stat --group -- sleep 1 Performance counter stats for 'sleep 1': 0.554926 task-clock # 0.001 CPUs utilized <not counted> context-switches <not counted> CPU-migrations <not counted> page-faults <not counted> cycles <not supported> stalled-cycles-frontend <not supported> stalled-cycles-backend <not counted> instructions <not counted> branches <not counted> branch-misses 1.001228093 seconds time elapsed Fix it by disabling group leader only. Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1331887340-32448-1-git-send-email-namhyung.kim@lge.com Signed-off-by: Namhyung Kim <namhyung.kim@lge.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to '')
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index ea40e4e8b227..c941bb640f49 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -296,7 +296,7 @@ static int create_perf_stat_counter(struct perf_evsel *evsel,
if (system_wide)
return perf_evsel__open_per_cpu(evsel, evsel_list->cpus,
group, group_fd);
- if (!target_pid && !target_tid) {
+ if (!target_pid && !target_tid && (!group || evsel == first)) {
attr->disabled = 1;
attr->enable_on_exec = 1;