aboutsummaryrefslogtreecommitdiffstats
path: root/tools
diff options
context:
space:
mode:
authorDavid Ahern <david.ahern@oracle.com>2015-04-09 12:48:27 -0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-04-10 10:10:55 -0300
commit7764a385f60bd200304a33124bdb4e684caeabdf (patch)
treeaee1436f97de4571d4a490307808e736af02d6fb /tools
parent51ab7155c08baf45cc2aa911961e5b78422e478f (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.c14
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;

Privacy Policy