Feather-Trace: update locking timestamps

Reassing locking timestamps and prepare support for tracing
system call overheads.

1 files changed, 21 insertions, 0 deletions

diff --git a/litmus/trace.c b/litmus/trace.c
index 7d726a8e8e02..fc1d03f35d39 100644
--- a/litmus/trace.c
+++ b/litmus/trace.c
@@ -74,6 +74,7 @@ static void __add_timestamp_user(struct timestamp *pre_recorded)
         if (ft_buffer_start_write(trace_ts_buf, (void**)  &ts)) {
                 *ts = *pre_recorded;
                 ts->seq_no = seq_no;
+                ts->cpu    = raw_smp_processor_id();
                 __save_irq_flags(ts);
                 ft_buffer_finish_write(trace_ts_buf, ts);
         }
@@ -136,6 +137,26 @@ feather_callback void save_task_latency(unsigned long event,
         }
 }
 
+/* fake timestamp to user-reported time */
+void save_timestamp_time(unsigned long event,
+                         unsigned long ptr)
+{
+        uint64_t* time = (uint64_t*) ptr;
+        unsigned int seq_no;
+        struct timestamp *ts;
+        seq_no = fetch_and_inc((int *) &ts_seq_no);
+        if (ft_buffer_start_write(trace_ts_buf, (void**)  &ts)) {
+                ts->event     = event;
+                ts->seq_no    = seq_no;
+                ts->pid       = current->pid;
+                ts->cpu       = raw_smp_processor_id();
+                ts->task_type = is_realtime(current) ? TSK_RT : TSK_BE;
+                __save_irq_flags(ts);
+                ts->timestamp = *time;
+                ft_buffer_finish_write(trace_ts_buf, ts);
+        }
+}
+
 /******************************************************************************/
 /*                        DEVICE FILE DRIVER                                  */
 /******************************************************************************/