consumer_stream_destroy(stream, metadata_ht);
}
+void consumer_stream_copy_ro_channel_values(struct lttng_consumer_stream *stream,
+ struct lttng_consumer_channel *channel)
+{
+ stream->channel_ro_tracefile_size = channel->tracefile_size;
+ memcpy(stream->channel_ro_pathname, channel->pathname, PATH_MAX);
+}
+
struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
uint64_t stream_key,
enum lttng_consumer_stream_state state,
return written;
}
+/*
+ * Sample the snapshot positions for a specific fd
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream *stream)
+{
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ return lttng_kconsumer_sample_snapshot_positions(stream);
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ return lttng_ustconsumer_sample_snapshot_positions(stream);
+ default:
+ ERR("Unknown consumer_data type");
+ assert(0);
+ return -ENOSYS;
+ }
+}
/*
* Take a snapshot for a specific fd
*
}
}
+/*
+ * Get the consumed position
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream *stream,
+ unsigned long *pos)
+{
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ return lttng_kconsumer_get_consumed_snapshot(stream, pos);
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ return lttng_ustconsumer_get_consumed_snapshot(stream, pos);
+ default:
+ ERR("Unknown consumer_data type");
+ assert(0);
+ return -ENOSYS;
+ }
+}
+
int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
int sock, struct pollfd *consumer_sockpoll)
{
return NULL;
}
+static
+int rotate_notify_sessiond(struct lttng_consumer_local_data *ctx,
+ uint64_t key)
+{
+ int ret;
+
+ do {
+ ret = write(ctx->channel_rotate_pipe, &key, sizeof(key));
+ } while (ret == -1 && errno == EINTR);
+ if (ret == -1) {
+ PERROR("write to the channel rotate pipe");
+ } else {
+ DBG("Sent channel rotation notification for channel key %"
+ PRIu64, key);
+ }
+
+ return ret;
+}
+
+/*
+ * Perform operations that need to be done after a stream has
+ * rotated and released the stream lock.
+ *
+ * Multiple rotations cannot occur simultaneously, so we know the state of the
+ * "rotated" stream flag cannot change.
+ *
+ * This MUST be called WITHOUT the stream lock held.
+ */
+static
+int consumer_post_rotation(struct lttng_consumer_stream *stream,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret = 0;
+
+ if (!stream->rotated) {
+ goto end;
+ }
+
+ pthread_mutex_lock(&stream->chan->lock);
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ break;
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ /*
+ * The ust_metadata_pushed counter has been reset to 0, so now
+ * we can wakeup the metadata thread so it dumps the metadata
+ * cache to the new file.
+ */
+ if (stream->metadata_flag) {
+ consumer_metadata_wakeup_pipe(stream->chan);
+ }
+ break;
+ default:
+ ERR("Unknown consumer_data type");
+ abort();
+ }
+
+ if (--stream->chan->nr_stream_rotate_pending == 0) {
+ ret = rotate_notify_sessiond(ctx, stream->chan->key);
+ }
+ pthread_mutex_unlock(&stream->chan->lock);
+ stream->rotated = 0;
+
+end:
+ return ret;
+}
+
ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
struct lttng_consumer_local_data *ctx)
{
ssize_t ret;
+ int rotate_ret;
pthread_mutex_lock(&stream->lock);
if (stream->metadata_flag) {
pthread_mutex_unlock(&stream->metadata_rdv_lock);
}
pthread_mutex_unlock(&stream->lock);
+
+ rotate_ret = consumer_post_rotation(stream, ctx);
+ if (rotate_ret < 0) {
+ ERR("Failed after a rotation");
+ ret = -1;
+ }
+
return ret;
}
}
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.
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_consumer_rotate_channel(uint64_t key, char *path,
+ uint64_t relayd_id, uint32_t metadata,
+ 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("Kernel 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);
+ snprintf(channel->pathname, PATH_MAX, "%s", path);
+
+ 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();
+
+ /*
+ * Lock stream because we are about to change its state.
+ */
+ pthread_mutex_lock(&stream->lock);
+ memcpy(stream->channel_ro_pathname, channel->pathname, PATH_MAX);
+ ret = lttng_consumer_sample_snapshot_positions(stream);
+ if (ret < 0) {
+ ERR("Taking kernel snapshot positions");
+ goto end_unlock;
+ } else {
+ uint64_t consumed_pos;
+
+ ret = lttng_consumer_get_produced_snapshot(stream,
+ &stream->rotate_position);
+ if (ret < 0) {
+ ERR("Produced kernel snapshot position");
+ goto end_unlock;
+ }
+ fprintf(stderr, "Stream %lu should rotate after %lu to %s\n",
+ stream->key, stream->rotate_position,
+ channel->pathname);
+ lttng_consumer_get_consumed_snapshot(stream,
+ &consumed_pos);
+ fprintf(stderr, "consumed %lu\n", consumed_pos);
+ if (consumed_pos == stream->rotate_position) {
+ stream->rotate_ready = 1;
+ fprintf(stderr, "Stream %lu ready to rotate to %s\n",
+ stream->key, channel->pathname);
+ }
+ }
+ channel->nr_stream_rotate_pending++;
+
+ ret = consumer_flush_buffer(stream, 1);
+ if (ret < 0) {
+ ERR("Failed to flush stream");
+ goto end_unlock;
+ }
+
+ pthread_mutex_unlock(&stream->lock);
+ }
+
+ ret = 0;
+ goto end_unlock_channel;
+
+end_unlock:
+ pthread_mutex_unlock(&stream->lock);
+end_unlock_channel:
+ pthread_mutex_unlock(&channel->lock);
+end:
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Performs the stream rotation for the rotate session feature if needed.
+ * It must be called with the stream and channel locks held.
+ *
+ * Return 0 on success, a negative number of error.
+ */
+int lttng_consumer_rotate_stream(struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_stream *stream)
+{
+ int ret;
+ unsigned long consumed_pos;
+
+ if (!stream->rotate_position && !stream->rotate_ready) {
+ ret = 0;
+ goto end;
+ }
+
+ /*
+ * If we don't have the rotate_ready flag, check the consumed position
+ * to determine if we need to rotate.
+ */
+ if (!stream->rotate_ready) {
+ ret = lttng_consumer_sample_snapshot_positions(stream);
+ if (ret < 0) {
+ ERR("Taking kernel snapshot positions");
+ goto error;
+ }
+
+ ret = lttng_consumer_get_consumed_snapshot(stream, &consumed_pos);
+ if (ret < 0) {
+ ERR("Produced kernel snapshot position");
+ goto error;
+ }
+
+ fprintf(stderr, "packet %lu, pos %lu\n", stream->key, consumed_pos);
+ /* Rotate position not reached yet. */
+ if (consumed_pos < stream->rotate_position) {
+ ret = 0;
+ goto end;
+ }
+ fprintf(stderr, "Rotate position %lu (expected %lu) reached for stream %lu\n",
+ consumed_pos, stream->rotate_position, stream->key);
+ } else {
+ fprintf(stderr, "Rotate position reached for stream %lu\n",
+ stream->key);
+ }
+
+ ret = close(stream->out_fd);
+ if (ret < 0) {
+ PERROR("Closing tracefile");
+ goto error;
+ }
+
+ fprintf(stderr, "Rotating stream %lu to %s/%s\n", stream->key,
+ stream->channel_ro_pathname, stream->name);
+ ret = utils_create_stream_file(stream->channel_ro_pathname, stream->name,
+ stream->channel_ro_tracefile_size, stream->tracefile_count_current,
+ stream->uid, stream->gid, NULL);
+ if (ret < 0) {
+ goto error;
+ }
+ stream->out_fd = ret;
+ stream->tracefile_size_current = 0;
+
+ if (!stream->metadata_flag) {
+ struct lttng_index_file *index_file;
+
+ lttng_index_file_put(stream->index_file);
+
+ index_file = lttng_index_file_create(stream->channel_ro_pathname,
+ stream->name, stream->uid, stream->gid,
+ stream->channel_ro_tracefile_size,
+ stream->tracefile_count_current,
+ CTF_INDEX_MAJOR, CTF_INDEX_MINOR);
+ if (!index_file) {
+ goto error;
+ }
+ stream->index_file = index_file;
+ stream->out_fd_offset = 0;
+ } else {
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ /*
+ * Reset the position of what has been read from the metadata
+ * cache to 0 so we can dump it again.
+ */
+ ret = kernctl_metadata_cache_dump(stream->wait_fd);
+ if (ret < 0) {
+ ERR("Failed to dump the kernel metadata cache after rotation");
+ goto error;
+ }
+ break;
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ /*
+ * Reset the position pushed from the metadata cache so it
+ * will write from the beginning on the next push.
+ */
+ stream->ust_metadata_pushed = 0;
+ break;
+ default:
+ ERR("Unknown consumer_data type");
+ abort();
+ }
+ }
+
+ stream->rotate_position = 0;
+ stream->rotate_ready = 0;
+ stream->rotated = 1;
+
+ ret = 0;
+ goto end;
+
+error:
+ ret = -1;
+end:
+ return ret;
+}
+
+/*
+ * Rotate all the ready streams.
+ *
+ * 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();
+
+ 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();
+
+ /*
+ * Lock stream because we are about to change its state.
+ */
+ pthread_mutex_lock(&stream->lock);
+ if (stream->rotate_ready == 0) {
+ pthread_mutex_unlock(&stream->lock);
+ continue;
+ }
+ ret = lttng_consumer_rotate_stream(ctx, stream);
+ if (ret < 0) {
+ pthread_mutex_unlock(&stream->lock);
+ ERR("Stream rotation error");
+ goto end;
+ }
+
+ pthread_mutex_unlock(&stream->lock);
+ ret = consumer_post_rotation(stream, ctx);
+ if (ret < 0) {
+ ERR("Failed after a rotation");
+ goto end;
+ }
+ }
+
+ ret = 0;
+
+end:
+ rcu_read_unlock();
+ return ret;
+}
projects / lttng-tools.git / blobdiff