trx0purge.c:

  Remove duplicated innodb max purge lag code

innobase/trx/trx0purge.c

@@ -1069,30 +1069,6 @@ trx_purge(void)
 		}
 	}
 
-	/* Determine how much data manipulation language (DML) statements
-	need to be delayed in order to reduce the lagging of the purge
-	thread. */
-	srv_dml_needed_delay = 0; /* in microseconds; default: no delay */
-
-	/* If we cannot advance the 'purge view' because of an old
-	'consistent read view', then the DML statements cannot be delayed.
-	Also, srv_max_purge_lag <= 0 means 'infinity'. */
-	if (srv_max_purge_lag > 0
-			&& !UT_LIST_GET_LAST(trx_sys->view_list)) {
-		float	ratio = (float) trx_sys->rseg_history_len
-				/ srv_max_purge_lag;
-		if (ratio > ULINT_MAX / 10000) {
-			/* Avoid overflow: maximum delay is 4295 seconds */
-			srv_dml_needed_delay = ULINT_MAX;
-		} else if (ratio > 1) {
-			/* If the history list length exceeds the
-			innodb_max_purge_lag, the
-			data manipulation statements are delayed
-			by at least 5000 microseconds. */
-			srv_dml_needed_delay = (ulint) ((ratio - .5) * 10000);
-		}
-	}
-
 	purge_sys->view = read_view_oldest_copy_or_open_new(NULL,
 							purge_sys->heap);
 	mutex_exit(&kernel_mutex);