diff --git a/include/proto/activity.h b/include/proto/activity.h
index 4cf9c8d..717d667 100644
--- a/include/proto/activity.h
+++ b/include/proto/activity.h
@@ -26,6 +26,7 @@
 #include <common/hathreads.h>
 #include <common/time.h>
 #include <types/activity.h>
+#include <proto/freq_ctr.h>
 
 extern struct activity activity[MAX_THREADS];
 
@@ -34,12 +35,15 @@
 
 /* Collect date and time information before calling poll(). This will be used
  * to count the run time of the past loop and the sleep time of the next poll.
+ * It also makes use of the just updated before_poll timer to count the loop's
+ * run time and feed the average loop time metric (in microseconds).
  */
 static inline void activity_count_runtime()
 {
 	uint64_t new_mono_time;
 	uint64_t new_cpu_time;
 	int64_t stolen;
+	uint32_t run_time;
 
 	new_cpu_time   = now_cpu_time();
 	new_mono_time  = now_mono_time();
@@ -56,6 +60,9 @@
 			report_stolen_time(stolen);
 		}
 	}
+
+	run_time = (before_poll.tv_sec - after_poll.tv_sec) * 1000000U + (before_poll.tv_usec - after_poll.tv_usec);
+	swrate_add(&activity[tid].avg_loop_us, TIME_STATS_SAMPLES, run_time);
 }