The following commit has been merged into the perf/urgent branch of tip: Commit-ID: f3bed55e850926614b9898fe982f66d2541a36a5 Gitweb: https://git.kernel.org/tip/f3bed55e850926614b9898fe982f66d2541a36a5 Author: Ian Rogers <irogers@xxxxxxxxxx> AuthorDate: Fri, 17 Apr 2020 11:28:42 -07:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Wed, 22 Apr 2020 23:10:14 +02:00 perf/core: fix parent pid/tid in task exit events 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 --- kernel/events/core.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index bc9b98a..633b4ae 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7491,10 +7491,17 @@ static void perf_event_task_output(struct perf_event *event, 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);
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