Patch hrtimer_wakeup() callback to record RELEASE_LATENCY

Record interrupt latency for tasks that use nanosleep or some other
interface that ends up using a hrtimer_sleeper struct to trigger the
wakeup of the task when the next job is released.

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index bb281cfa31e9..2ce65d992935 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -50,6 +50,9 @@
 #include <linux/timer.h>
 #include <linux/freezer.h>
 
+#include <litmus/debug_trace.h>
+#include <litmus/trace.h>
+
 #include <asm/uaccess.h>
 
 #include <trace/events/timer.h>
@@ -1480,7 +1483,15 @@ static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer)
 
         t->task = NULL;
         if (task)
+        {
+                if (is_realtime(task))
+                {
+                        ktime_t expires = hrtimer_get_expires(timer);
+                        lt_t intended_release = ktime_to_ns(expires);
+                        TS_RELEASE_LATENCY(intended_release);
+                }
                 wake_up_process(task);
+        }
 
         return HRTIMER_NORESTART;
 }