BUG#29138644 PAGE CLEANER WILL SLEEP FOR LONG TIME IF CLOCK CHANGES

Fix for invalid comparison of time vs monotonic time when checking
when error monitor was last updated.

Reviewed by: Rahul Malik <[email protected]>

Author: Paweł Olchawa

storage/innobase/srv/srv0srv.cc

@@ -1727,7 +1727,7 @@ void srv_error_monitor_thread() {
 
   old_lsn = new_lsn;
 
-  if (difftime(time(NULL), srv_last_monitor_time) > 60) {
+  if (ut_difftime(ut_time_monotonic(), srv_last_monitor_time) > 60) {
     /* We referesh InnoDB Monitor values so that averages are
     printed from at most 60 last seconds */