MINOR: backend: add traces for idle connections reuse
Add traces in connect_server() to debug idle connection reuse. These
are attached to stream trace module, as it's already in use in
backend.c with the macro TRACE_SOURCE.
diff --git a/src/backend.c b/src/backend.c
index 0a7875c..4c7aba1 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -1325,13 +1325,17 @@
hash = conn_calculate_hash(&hash_params);
/* do not reuse if mode is not http */
- if (!IS_HTX_STRM(s))
+ if (!IS_HTX_STRM(s)) {
+ DBG_TRACE_STATE("skip idle connections reuse: no htx", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
goto skip_reuse;
+ }
/* first, search for a matching connection in the session's idle conns */
srv_conn = session_get_conn(s->sess, s->target, hash);
- if (srv_conn)
+ if (srv_conn) {
+ DBG_TRACE_STATE("reuse connection from session", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
reuse = 1;
+ }
if (srv && !reuse && reuse_mode != PR_O_REUSE_NEVR) {
/* Below we pick connections from the safe, idle or
@@ -1354,8 +1358,10 @@
*/
if (!eb_is_empty(&srv->per_thr[tid].avail_conns)) {
srv_conn = srv_lookup_conn(&srv->per_thr[tid].avail_conns, hash);
- if (srv_conn)
+ if (srv_conn) {
+ DBG_TRACE_STATE("reuse connection from avail", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
reuse = 1;
+ }
}
/* if no available connections found, search for an idle/safe */
@@ -1386,8 +1392,10 @@
}
}
- if (srv_conn)
+ if (srv_conn) {
+ DBG_TRACE_STATE("reuse connection from idle/safe", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
reuse = 1;
+ }
}
}
@@ -1498,6 +1506,7 @@
srv_cs = NULL;
if (srv_conn) {
+ DBG_TRACE_STATE("alloc new be connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
srv_conn->owner = s->sess;
/* connection will be attached to the session if