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MINOR: server: skip servers with no idle conns earlier

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In conn_backend_get() we can avoid locking other servers when trying
to steal their connections when we know for sure they will not have
one, so let's do it to lower the contention on the lock.
This commit is contained in:
Willy Tarreau 2020-07-01 08:24:44 +02:00
parent 69f591e3b0
commit 151c253a1e
1 changed files with 3 additions and 0 deletions
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src/backend.c
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@ -1099,6 +1099,9 @@ static struct connection *conn_backend_get(struct server *srv, int is_safe)
for (i = tid; !found && (i = ((i + 1 == global.nbthread) ? 0 : i + 1)) != tid;) {
struct mt_list *elt1, elt2;
if (!srv->curr_idle_thr[i])
continue;
HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[i].toremove_lock);
mt_list_for_each_entry_safe(conn, &mt_list[i], list, elt1, elt2) {
if (conn->mux->takeover && conn->mux->takeover(conn) == 0) {