[core] connection_joblist global

con->srv->joblist is expensive to traverse when cache is cold
and called from connection_handle_fdevent(); var made a global

src/base.h

@@ -158,7 +158,6 @@ struct server {
 	buffer *tmp_buf;
 
 	connections conns;
-	connections *joblist;
 	connections joblist_A;
 	connections joblist_B;
 	connections fdwaitqueue;

src/connections-glue.c

@@ -5,6 +5,8 @@
 
 #include <stdlib.h>
 
+connections *connection_joblist;
+
 __attribute_cold__
 static void connection_list_resize(connections *conns) {
     conns->size += 16;

src/connections.h

@@ -19,7 +19,8 @@ connection * connection_accepted(server *srv, server_socket *srv_socket, sock_ad
 
 void connection_state_machine(connection *con);
 
-#define joblist_append(con) connection_list_append((con)->srv->joblist, (con))
+extern connections *connection_joblist;
+#define joblist_append(con) connection_list_append(connection_joblist, (con))
 void connection_list_append(connections *conns, connection *con);
 
 #endif

src/server.c

@@ -239,7 +239,7 @@ static server *server_init(void) {
 
 	CLEAN(tmp_buf);
 #undef CLEAN
-	srv->joblist = &srv->joblist_A;
+	connection_joblist = &srv->joblist_A;
 
 	strftime_cache_reset();
 
@@ -1856,13 +1856,13 @@ static void server_main_loop (server * const srv) {
 			server_process_fdwaitqueue(srv);
 		}
 
-		connections * const joblist = srv->joblist;
+		connections * const joblist = connection_joblist;
 
 		if (fdevent_poll(srv->ev, joblist->used ? 0 : 1000) > 0) {
 			last_active_ts = log_epoch_secs;
 		}
 
-		srv->joblist = (joblist == &srv->joblist_A)
+		connection_joblist = (joblist == &srv->joblist_A)
 		  ? &srv->joblist_B
 		  : &srv->joblist_A;