[sysprof] perf: use task-ids instead of pids

[Christian Hergert <chergert src gnome org>]

commit bcfaa6caa868d8e658d3505787b262c63271842a
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jan 23 12:26:18 2020 -0800

    perf: use task-ids instead of pids
    
    The pids might overlap, which isn't that useful for us when we are creating
    threads. Instead use the task-ids (which should basically overlap anyway).

 src/libsysprof/sysprof-perf-source.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/libsysprof/sysprof-perf-source.c b/src/libsysprof/sysprof-perf-source.c
index 238b9ea..17e1980 100644
--- a/src/libsysprof/sysprof-perf-source.c
+++ b/src/libsysprof/sysprof-perf-source.c
@@ -358,8 +358,8 @@ sysprof_perf_source_handle_event (SysprofPerfCounterEvent *event,
       sysprof_capture_writer_add_fork (self->writer,
                                        event->fork.time,
                                        cpu,
-                                       event->fork.ppid,
-                                       event->fork.pid);
+                                       event->fork.ptid,
+                                       event->fork.tid);
 
       /*
        * TODO: We should add support for "follow fork" of the GPid if we are