diff --git a/src/lib/ioloop.c b/src/lib/ioloop.c
index ebf1ec1630..d524a0af29 100644
--- a/src/lib/ioloop.c
+++ b/src/lib/ioloop.c
@@ -15,8 +15,9 @@
 
 time_t ioloop_time = 0;
 struct timeval ioloop_timeval;
-
 struct ioloop *current_ioloop = NULL;
+uint64_t ioloop_global_wait_usecs = 0;
+
 static ARRAY(io_switch_callback_t *) io_switch_callbacks = ARRAY_INIT;
 
 static void io_loop_initialize_handler(struct ioloop *ioloop)
@@ -524,8 +525,10 @@ static void io_loop_handle_timeouts_real(struct ioloop *ioloop)
 			ioloop->time_moved_callback(ioloop->next_max_time,
 						    ioloop_timeval.tv_sec);
 		}
-		ioloop->ioloop_wait_usecs +=
+		long long diff =
 			timeval_diff_usecs(&ioloop_timeval, &prev_ioloop_timeval);
+		ioloop->ioloop_wait_usecs += diff;
+		ioloop_global_wait_usecs += diff;
 	}
 
 	ioloop_time = ioloop_timeval.tv_sec;
diff --git a/src/lib/ioloop.h b/src/lib/ioloop.h
index 4db2903482..c33d841064 100644
--- a/src/lib/ioloop.h
+++ b/src/lib/ioloop.h
@@ -41,6 +41,8 @@ extern time_t ioloop_time;
 extern struct timeval ioloop_timeval;
 
 extern struct ioloop *current_ioloop;
+/* Number of microseconds spent on all the ioloops waiting for themselves. */
+extern uint64_t ioloop_global_wait_usecs;
 
 /* You can create different handlers for IO_READ and IO_WRITE. IO_READ and
    IO_ERROR can't use different handlers (and there's no point anyway).