slow log configuration implemented

src/slowlog.c

@@ -54,6 +54,7 @@ void slowlogInit(void) {
  * This function will make sure to trim the slow log accordingly to the
  * configured max length. */
 void slowlogPushEntryIfNeeded(robj **argv, int argc, long long duration) {
+    if (server.slowlog_log_slower_than < 0) return; /* Slowlog disabled */
     if (duration > server.slowlog_log_slower_than)
         listAddNodeHead(server.slowlog,slowlogCreateEntry(argv,argc,duration));