iolog.c: fix inaccurate clat when replay trace

When do timestamp replay with high qd it will only reap the
completed commands when the qd reach the max iodepth, the commands
probably are finished long ago before command completion handling.

Fix is to use io_u_queued_complete instead of just usec_sleep in
iolog_delay

Signed-off-by: Kookoo Gu <Zhimin.Gu@solidigm.com>

iolog.c

@@ -82,8 +82,8 @@ static void iolog_delay(struct thread_data *td, unsigned long delay)
 {
 	uint64_t usec = utime_since_now(&td->last_issue);
 	unsigned long orig_delay = delay;
-	uint64_t this_delay;
 	struct timespec ts;
+	int ret = 0;
 
 	if (delay < td->time_offset) {
 		td->time_offset = 0;
@@ -97,13 +97,13 @@ static void iolog_delay(struct thread_data *td, unsigned long delay)
 	delay -= usec;
 
 	fio_gettime(&ts, NULL);
-	while (delay && !td->terminate) {
-		this_delay = delay;
-		if (this_delay > 500000)
-			this_delay = 500000;
 
-		usec_sleep(td, this_delay);
-		delay -= this_delay;
+	while(delay && !td->terminate) {
+		ret = io_u_queued_complete(td, 0);
+		if (ret < 0)
+			td_verror(td, -ret, "io_u_queued_complete");
+		if (utime_since_now(&ts) > delay)
+			break;
 	}
 
 	usec = utime_since_now(&ts);