From: Ian Rogers <irogers@xxxxxxxxxx>
commit f3bed55e850926614b9898fe982f66d2541a36a5 upstream.
Current logic yields the child task as the parent.
Before:
$ perf record bash -c "perf list > /dev/null"
$ perf script -D |grep 'FORK\|EXIT'
4387036190981094 0x5a70 [0x30]: PERF_RECORD_FORK(10472:10472):(10470:10470)
4387036606207580 0xf050 [0x30]: PERF_RECORD_EXIT(10472:10472):(10472:10472)
4387036607103839 0x17150 [0x30]: PERF_RECORD_EXIT(10470:10470):(10470:10470)
^
Note the repeated values here -------------------/
After:
383281514043 0x9d8 [0x30]: PERF_RECORD_FORK(2268:2268):(2266:2266)
383442003996 0x2180 [0x30]: PERF_RECORD_EXIT(2268:2268):(2266:2266)
383451297778 0xb70 [0x30]: PERF_RECORD_EXIT(2266:2266):(2265:2265)
Fixes: 94d5d1b2d891 ("perf_counter: Report the cloning task as parent on perf_counter_fork()")
Reported-by: KP Singh <kpsingh@xxxxxxxxxx>
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20200417182842.12522-1-irogers@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/events/core.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6610,10 +6610,17 @@ static void perf_event_task_output(struc
goto out;
task_event->event_id.pid = perf_event_pid(event, task);
- task_event->event_id.ppid = perf_event_pid(event, current);
-
task_event->event_id.tid = perf_event_tid(event, task);
- task_event->event_id.ptid = perf_event_tid(event, current);
+
+ if (task_event->event_id.header.type == PERF_RECORD_EXIT) {
+ task_event->event_id.ppid = perf_event_pid(event,
+ task->real_parent);
+ task_event->event_id.ptid = perf_event_pid(event,
+ task->real_parent);
+ } else { /* PERF_RECORD_FORK */
+ task_event->event_id.ppid = perf_event_pid(event, current);
+ task_event->event_id.ptid = perf_event_tid(event, current);
+ }
task_event->event_id.time = perf_event_clock(event);
