-int processlist_add(ProcessList *process_list, guint pid, LttTime *birth,
- guint trace_num, gchar *name, guint *height,
+/* CPU num is only used for PID 0 */
+int processlist_add(ProcessList *process_list, guint pid, guint cpu, guint ppid,
+ LttTime *birth, guint trace_num, const gchar *name, guint *height,