From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Fri, 31 Jan 2020 21:12:24 +0000 (-0500)
Subject: Fix: relayd: register listener threads as rcu readers
X-Git-Tag: v2.12.0-rc1~19
X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=8fba2b8dfd9d2e9070741e082b9c1f84cb33f799

Fix: relayd: register listener threads as rcu readers

Both live and consumer listener threads are now RCU readers as
they use the fd_tracker which makes use of RCU.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I8aab8615b8db1f1fea48deb1ae03ad5beeaa6f32
---

diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c
index a64d69b02..f28b9c66f 100644
--- a/src/bin/lttng-relayd/live.c
+++ b/src/bin/lttng-relayd/live.c
@@ -598,6 +598,7 @@ void *thread_listener(void *data)
 
 	DBG("[thread] Relay live listener started");
 
+	rcu_register_thread();
 	health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER);
 
 	health_code_update();
@@ -739,6 +740,7 @@ error_sock_control:
 		DBG("Live viewer listener thread exited with error");
 	}
 	health_unregister(health_relayd);
+	rcu_unregister_thread();
 	DBG("Live viewer listener thread cleanup complete");
 	if (lttng_relay_stop_threads()) {
 		ERR("Error stopping threads");
diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c
index 8415e8cef..3295b009a 100644
--- a/src/bin/lttng-relayd/main.c
+++ b/src/bin/lttng-relayd/main.c
@@ -1075,6 +1075,7 @@ static void *relay_thread_listener(void *data)
 
 	DBG("[thread] Relay listener started");
 
+	rcu_register_thread();
 	health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER);
 
 	health_code_update();
@@ -1258,6 +1259,7 @@ error_sock_control:
 		ERR("Health error occurred in %s", __func__);
 	}
 	health_unregister(health_relayd);
+	rcu_unregister_thread();
 	DBG("Relay listener thread cleanup complete");
 	lttng_relay_stop_threads();
 	return NULL;