Implement consumer ring buffer position sampling
[lttng-tools.git] / src / bin / lttng-sessiond / ust-consumer.c
index 3bb54f03983178f035fdcb345f8e1d7670557847..fe2c8f4c8055b41048e6b9645ab7e2e2572f5c21 100644 (file)
@@ -32,6 +32,7 @@
 #include "ust-consumer.h"
 #include "buffer-registry.h"
 #include "session.h"
+#include "lttng-sessiond.h"
 
 /*
  * Return allocated full pathname of the session using the consumer trace path
@@ -94,7 +95,7 @@ error:
 }
 
 /*
- * Send a single channel to the consumer using command ADD_CHANNEL.
+ * Send a single channel to the consumer using command ASK_CHANNEL_CREATION.
  *
  * Consumer socket lock MUST be acquired before calling this.
  */
@@ -174,6 +175,7 @@ static int ask_channel_creation(struct ust_app_session *ua_sess,
                        ua_chan->attr.switch_timer_interval,
                        ua_chan->attr.read_timer_interval,
                        ua_sess->live_timer_interval,
+                       ua_chan->monitor_timer_interval,
                        output,
                        (int) ua_chan->attr.type,
                        ua_sess->tracing_id,
@@ -223,6 +225,8 @@ error:
 /*
  * Ask consumer to create a channel for a given session.
  *
+ * Session list and rcu read side locks must be held by the caller.
+ *
  * Returns 0 on success else a negative value.
  */
 int ust_consumer_ask_channel(struct ust_app_session *ua_sess,
@@ -230,6 +234,7 @@ int ust_consumer_ask_channel(struct ust_app_session *ua_sess,
                struct consumer_socket *socket, struct ust_registry_session *registry)
 {
        int ret;
+       struct ltt_session *session;
 
        assert(ua_sess);
        assert(ua_chan);
@@ -243,10 +248,14 @@ int ust_consumer_ask_channel(struct ust_app_session *ua_sess,
                goto error;
        }
 
+       session = session_find_by_id(ua_sess->tracing_id);
+       assert(session);
+
        pthread_mutex_lock(socket->lock);
        ret = ask_channel_creation(ua_sess, ua_chan, consumer, socket, registry);
        pthread_mutex_unlock(socket->lock);
        if (ret < 0) {
+               ERR("ask_channel_creation consumer command failed");
                goto error;
        }
 
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