diff options
| author | David Ahern <david.ahern@oracle.com> | 2015-04-09 12:48:27 -0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-04-10 10:10:55 -0300 |
| commit | 7764a385f60bd200304a33124bdb4e684caeabdf (patch) | |
| tree | aee1436f97de4571d4a490307808e736af02d6fb /tools | |
| parent | 51ab7155c08baf45cc2aa911961e5b78422e478f (diff) | |
perf tools: Fix synthesizing fork_event.ppid for non-main thread
Commit ca6c41c59b9 sets the ppid based on what is read from the
/proc/pid/status file when synthesizing fork events.
This is correct thing to do for new processes but not threads of a
process.
Fix ppid for threads to be the main thread when synthesizing fork events
(ie., assume main thread spawned all sub-threads in a process).
Reported-by: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Signed-off-by: David Ahern <david.ahern@oracle.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Don Zickus <dzickus@redhat.com>
Link: http://lkml.kernel.org/r/1428598107-178999-1-git-send-email-david.ahern@oracle.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/event.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c index 5516236df6ab..9d0985131252 100644 --- a/tools/perf/util/event.c +++ b/tools/perf/util/event.c @@ -183,8 +183,18 @@ static int perf_event__synthesize_fork(struct perf_tool *tool, { memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size); - event->fork.ppid = ppid; - event->fork.ptid = ppid; + /* + * for main thread set parent to ppid from status file. For other + * threads set parent pid to main thread. ie., assume main thread + * spawns all threads in a process + */ + if (tgid == pid) { + event->fork.ppid = ppid; + event->fork.ptid = ppid; + } else { + event->fork.ppid = tgid; + event->fork.ptid = tgid; + } event->fork.pid = tgid; event->fork.tid = pid; event->fork.header.type = PERF_RECORD_FORK; |