return start_pos;
}
+static
+int consumer_flush_buffer(struct lttng_consumer_stream *stream, int producer_active)
+{
+ int ret = 0;
+
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ ret = kernctl_buffer_flush(stream->wait_fd);
+ if (ret < 0) {
+ ERR("Failed to flush kernel stream");
+ goto end;
+ }
+ break;
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ lttng_ustctl_flush_buffer(stream, producer_active);
+ break;
+ default:
+ ERR("Unknown consumer_data type");
+ abort();
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * Sample the rotate position for all the streams of a channel. If a stream
+ * is already at the rotate position (produced == consumed), we flag it as
+ * ready for rotation. The rotation of ready streams occurs after we have
+ * replied to the session daemon that we have finished sampling the positions.
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_consumer_rotate_channel(uint64_t key, const char *path,
+ uint64_t relayd_id, uint32_t metadata, uint64_t new_chunk_id,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret;
+ struct lttng_consumer_channel *channel;
+ struct lttng_consumer_stream *stream;
+ struct lttng_ht_iter iter;
+ struct lttng_ht *ht = consumer_data.stream_per_chan_id_ht;
+
+ DBG("Consumer sample rotate position for channel %" PRIu64, key);
+
+ rcu_read_lock();
+
+ channel = consumer_find_channel(key);
+ if (!channel) {
+ ERR("No channel found for key %" PRIu64, key);
+ ret = -1;
+ goto end;
+ }
+
+ pthread_mutex_lock(&channel->lock);
+ channel->current_chunk_id = new_chunk_id;
+
+ ret = lttng_strncpy(channel->pathname, path, sizeof(channel->pathname));
+ if (ret) {
+ ERR("Failed to copy new path to channel during channel rotation");
+ ret = -1;
+ goto end_unlock_channel;
+ }
+
+ if (relayd_id == -1ULL) {
+ /*
+ * The domain path (/ust or /kernel) has been created before, we
+ * now need to create the last part of the path: the application/user
+ * specific section (uid/1000/64-bit).
+ */
+ ret = utils_mkdir_recursive(channel->pathname, S_IRWXU | S_IRWXG,
+ channel->uid, channel->gid);
+ if (ret < 0) {
+ ERR("Failed to create trace directory at %s during rotation",
+ channel->pathname);
+ ret = -1;
+ goto end_unlock_channel;
+ }
+ }
+
+ cds_lfht_for_each_entry_duplicate(ht->ht,
+ ht->hash_fct(&channel->key, lttng_ht_seed),
+ ht->match_fct, &channel->key, &iter.iter,
+ stream, node_channel_id.node) {
+ unsigned long consumed_pos;
+
+ health_code_update();
+
+ /*
+ * Lock stream because we are about to change its state.
+ */
+ pthread_mutex_lock(&stream->lock);
+
+ ret = lttng_strncpy(stream->channel_read_only_attributes.path,
+ channel->pathname,
+ sizeof(stream->channel_read_only_attributes.path));
+ if (ret) {
+ ERR("Failed to sample channel path name during channel rotation");
+ goto end_unlock_stream;
+ }
+ ret = lttng_consumer_sample_snapshot_positions(stream);
+ if (ret < 0) {
+ ERR("Failed to sample snapshot position during channel rotation");
+ goto end_unlock_stream;
+ }
+
+ ret = lttng_consumer_get_produced_snapshot(stream,
+ &stream->rotate_position);
+ if (ret < 0) {
+ ERR("Failed to sample produced position during channel rotation");
+ goto end_unlock_stream;
+ }
+
+ lttng_consumer_get_consumed_snapshot(stream,
+ &consumed_pos);
+ if (consumed_pos == stream->rotate_position) {
+ stream->rotate_ready = true;
+ }
+ channel->nr_stream_rotate_pending++;
+
+ ret = consumer_flush_buffer(stream, 1);
+ if (ret < 0) {
+ ERR("Failed to flush stream %" PRIu64 " during channel rotation",
+ stream->key);
+ goto end_unlock_stream;
+ }
+
+ pthread_mutex_unlock(&stream->lock);
+ }
+ pthread_mutex_unlock(&channel->lock);
+
+ ret = 0;
+ goto end;
+
+end_unlock_stream:
+ pthread_mutex_unlock(&stream->lock);
+end_unlock_channel:
+ pthread_mutex_unlock(&channel->lock);
+end:
+ rcu_read_unlock();
+ return ret;
+}
+
/*
* Check if a stream is ready to be rotated after extracting it.
*
return ret;
}
+/*
+ * Rotate all the ready streams now.
+ *
+ * This is especially important for low throughput streams that have already
+ * been consumed, we cannot wait for their next packet to perform the
+ * rotation.
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_consumer_rotate_ready_streams(uint64_t key,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret;
+ struct lttng_consumer_channel *channel;
+ struct lttng_consumer_stream *stream;
+ struct lttng_ht_iter iter;
+ struct lttng_ht *ht = consumer_data.stream_per_chan_id_ht;
+
+ rcu_read_lock();
+
+ DBG("Consumer rotate ready streams in channel %" PRIu64, key);
+
+ channel = consumer_find_channel(key);
+ if (!channel) {
+ ERR("No channel found for key %" PRIu64, key);
+ ret = -1;
+ goto end;
+ }
+
+ cds_lfht_for_each_entry_duplicate(ht->ht,
+ ht->hash_fct(&channel->key, lttng_ht_seed),
+ ht->match_fct, &channel->key, &iter.iter,
+ stream, node_channel_id.node) {
+ health_code_update();
+
+ pthread_mutex_lock(&stream->lock);
+
+ if (!stream->rotate_ready) {
+ pthread_mutex_unlock(&stream->lock);
+ continue;
+ }
+ DBG("Consumer rotate ready stream %" PRIu64, stream->key);
+
+ ret = lttng_consumer_rotate_stream(ctx, stream, NULL);
+ pthread_mutex_unlock(&stream->lock);
+ if (ret) {
+ goto end;
+ }
+
+ ret = consumer_post_rotation(stream, ctx);
+ if (ret) {
+ goto end;
+ }
+ }
+
+ ret = 0;
+
+end:
+ rcu_read_unlock();
+ return ret;
+}
+
static
int rotate_rename_local(const char *old_path, const char *new_path,
uid_t uid, gid_t gid)
projects / lttng-tools.git / blobdiff