Feather-Trace: add support for locking-related syscall overheads

Support recording timestamps that allow tracing the entry and exit
costs of locking-related system calls.

1 files changed, 5 insertions, 0 deletions

diff --git a/litmus/sched_litmus.c b/litmus/sched_litmus.c
index 6553948407de..6b32cf09abbd 100644
--- a/litmus/sched_litmus.c
+++ b/litmus/sched_litmus.c
@@ -194,6 +194,9 @@ static void dequeue_task_litmus(struct rq *rq, struct task_struct *p,
 
 static void yield_task_litmus(struct rq *rq)
 {
+        TS_SYSCALL_IN_START;
+        TS_SYSCALL_IN_END;
+
         BUG_ON(rq->curr != current);
         /* sched_yield() is called to trigger delayed preemptions.
          * Thus, mark the current task as needing to be rescheduled.
@@ -202,6 +205,8 @@ static void yield_task_litmus(struct rq *rq)
          */
         clear_exit_np(current);
         litmus_reschedule_local();
+
+        TS_SYSCALL_OUT_START;
 }
 
 /* Plugins are responsible for this.