1 files changed, 7 insertions, 0 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 0b90364d1a2c..02d2de9d08ba 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2599,6 +2599,13 @@ ftrace_graph_probe_sched_switch(struct rq *__rq, struct task_struct *prev,
         unsigned long long timestamp;
         int index;
 
+        /*
+         * Does the user want to count the time a function was asleep.
+         * If so, do not update the time stamps.
+         */
+        if (trace_flags & TRACE_ITER_SLEEP_TIME)
+                return;
+
         timestamp = trace_clock_local();
 
         prev->ftrace_timestamp = timestamp;