1 files changed, 20 insertions, 1 deletions

diff --git a/include/litmus/sched_trace.h b/include/litmus/sched_trace.h
index fb5d8f33aff5..80d952374f7a 100644
--- a/include/litmus/sched_trace.h
+++ b/include/litmus/sched_trace.h
@@ -89,6 +89,11 @@ struct st_request_mode_data {
         u8      __unused[8];
 };
 
+struct st_sys_start_data {
+        u64     when;
+        u64     start;
+};
+
 #define DATA(x) struct st_ ## x ## _data x;
 
 typedef enum {
@@ -104,7 +109,8 @@ typedef enum {
         ST_ACTION,
         ST_SYS_RELEASE,
         ST_ENACT_MODE,
-        ST_REQUEST_MODE
+        ST_REQUEST_MODE,
+        ST_SYS_START,
 } st_event_record_type_t;
 
 struct st_event_record {
@@ -124,6 +130,7 @@ struct st_event_record {
                 DATA(sys_release);
                 DATA(enact_mode);
                 DATA(request_mode);
+                DATA(sys_start);
         } data;
 };
 
@@ -171,6 +178,8 @@ feather_callback void do_sched_trace_enact_mode(unsigned long id,
 
 feather_callback void do_sched_trace_request_mode(unsigned long id,
                                                 struct task_struct* task);
+feather_callback void do_sched_trace_sys_start(unsigned long id,
+                                                 lt_t* start);
 
 #endif
 
@@ -198,6 +207,7 @@ feather_callback void do_sched_trace_request_mode(unsigned long id,
 #define trace_litmus_sys_release(start)
 #define trace_litmus_enact_mode(t)
 #define trace_litmus_request_mode(t)
+#define trace_litmus_sys_start(start)
 
 #endif
 
@@ -286,6 +296,15 @@ feather_callback void do_sched_trace_request_mode(unsigned long id,
                         do_sched_trace_request_mode, t);                \
                 trace_litmus_request_mode(t);                           \
         } while (0)
+
+/* when is a pointer, it does not need an explicit cast to unsigned long */
+#define sched_trace_sys_start(when)                                     \
+        do {                                                            \
+                SCHED_TRACE(SCHED_TRACE_BASE_ID + 13,                   \
+                        do_sched_trace_sys_start, when);                \
+                trace_litmus_sys_start(when);                           \
+        } while (0)
+
 #endif /* __KERNEL__ */
 
 #endif