Fix: use "flush empty" ioctl for snapshots

[lttng-tools.git] / src / common / kernel-consumer / kernel-consumer.c

diff --git a/src/common/kernel-consumer/kernel-consumer.c b/src/common/kernel-consumer/kernel-consumer.c
index 1a786352d75adbfaedf93783ab4d9b91f559c0d2..b5afc73aa5fb167071145b35e6d8a16a4291cbc6 100644 (file)
--- a/src/common/kernel-consumer/kernel-consumer.c
+++ b/src/common/kernel-consumer/kernel-consumer.c
@@ -68,6 +68,19 @@ int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream)
        return ret;
 }
 
+/*
+ * Sample consumed and produced positions for a specific fd.
+ *
+ * Returns 0 on success, < 0 on error.
+ */
+int lttng_kconsumer_sample_snapshot_positions(
+               struct lttng_consumer_stream *stream)
+{
+       assert(stream);
+
+       return kernctl_snapshot_sample_positions(stream->wait_fd);
+}
+
 /*
  * Get the produced position
  *
@@ -183,11 +196,23 @@ int lttng_kconsumer_snapshot_channel(uint64_t key, char *path,
                                ERR("sending streams sent to relayd");
                                goto end_unlock;
                        }
+                       channel->streams_sent_to_relayd = true;
                }
 
-               ret = kernctl_buffer_flush(stream->wait_fd);
+               ret = kernctl_buffer_flush_empty(stream->wait_fd);
                if (ret < 0) {
-                       ERR("Failed to flush kernel stream");
+                       /*
+                        * Doing a buffer flush which does not take into
+                        * account empty packets. This is not perfect
+                        * for stream intersection, but required as a
+                        * fall-back when "flush_empty" is not
+                        * implemented by lttng-modules.
+                        */
+                       ret = kernctl_buffer_flush(stream->wait_fd);
+                       if (ret < 0) {
+                               ERR("Failed to flush kernel stream");
+                               goto end_unlock;
+                       }
                        goto end_unlock;
                }
 
@@ -534,9 +559,20 @@ int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                } else {
                        ret = consumer_add_channel(new_channel, ctx);
                }
-               if (CONSUMER_CHANNEL_TYPE_DATA) {
+               if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) {
+                       int monitor_start_ret;
+
+                       DBG("Consumer starting monitor timer");
                        consumer_timer_live_start(new_channel,
                                        msg.u.channel.live_timer_interval);
+                       monitor_start_ret = consumer_timer_monitor_start(
+                                       new_channel,
+                                       msg.u.channel.monitor_timer_interval);
+                       if (monitor_start_ret < 0) {
+                               ERR("Starting channel monitoring timer failed");
+                               goto end_nosignal;
+                       }
+
                }
 
                health_code_update();
@@ -717,6 +753,19 @@ int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                                consumer_stream_free(new_stream);
                                goto end_nosignal;
                        }
+
+                       /*
+                        * If adding an extra stream to an already
+                        * existing channel (e.g. cpu hotplug), we need
+                        * to send the "streams_sent" command to relayd.
+                        */
+                       if (channel->streams_sent_to_relayd) {
+                               ret = consumer_send_relayd_streams_sent(
+                                               new_stream->net_seq_idx);
+                               if (ret < 0) {
+                                       goto end_nosignal;
+                               }
+                       }
                }
 
                /* Get the right pipe where the stream will be sent. */
@@ -810,6 +859,7 @@ int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                        if (ret < 0) {
                                goto end_nosignal;
                        }
+                       channel->streams_sent_to_relayd = true;
                }
                break;
        }