/*
- * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * 2012 - David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
+ * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
*
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _LGPL_SOURCE
static struct lttng_ht *metadata_ht;
static struct lttng_ht *data_ht;
+static const char *get_consumer_domain(void)
+{
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ return DEFAULT_KERNEL_TRACE_DIR;
+ case LTTNG_CONSUMER64_UST:
+ /* Fall-through. */
+ case LTTNG_CONSUMER32_UST:
+ return DEFAULT_UST_TRACE_DIR;
+ default:
+ abort();
+ }
+}
+
/*
* Notify a thread lttng pipe to poll back again. This usually means that some
* global state has changed so we just send back the thread in a poll wait
stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE;
stream->index_file = NULL;
stream->last_sequence_number = -1ULL;
+ stream->rotate_position = -1ULL;
pthread_mutex_init(&stream->lock, NULL);
pthread_mutex_init(&stream->metadata_timer_lock, NULL);
/* Add stream on the relayd */
pthread_mutex_lock(&relayd->ctrl_sock_mutex);
ret = relayd_add_stream(&relayd->control_sock, stream->name,
- path, &stream->relayd_stream_id,
+ get_consumer_domain(), path, &stream->relayd_stream_id,
stream->chan->tracefile_size,
stream->chan->tracefile_count,
stream->trace_chunk);
}
}
+static
void lttng_consumer_close_all_metadata(void)
{
switch (consumer_data.type) {
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;
+ if (producer_active) {
+ ret = kernctl_buffer_flush(stream->wait_fd);
+ if (ret < 0) {
+ ERR("Failed to flush kernel stream");
+ goto end;
+ }
+ } else {
+ ret = kernctl_buffer_flush_empty(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);
+ lttng_ustconsumer_flush_buffer(stream, producer_active);
break;
default:
ERR("Unknown consumer_data type");
ht->hash_fct(&channel->key, lttng_ht_seed),
ht->match_fct, &channel->key, &iter.iter,
stream, node_channel_id.node) {
- unsigned long consumed_pos;
+ unsigned long produced_pos = 0, consumed_pos = 0;
health_code_update();
rotating_to_new_chunk = false;
}
- ret = lttng_consumer_sample_snapshot_positions(stream);
- if (ret < 0) {
- ERR("Failed to sample snapshot position during channel rotation");
- goto end_unlock_stream;
+ /*
+ * Do not flush an empty packet when rotating from a NULL trace
+ * chunk. The stream has no means to output data, and the prior
+ * rotation which rotated to NULL performed that side-effect already.
+ */
+ if (stream->trace_chunk) {
+ /*
+ * For metadata stream, do an active flush, which does not
+ * produce empty packets. For data streams, empty-flush;
+ * ensures we have at least one packet in each stream per trace
+ * chunk, even if no data was produced.
+ */
+ ret = consumer_flush_buffer(stream, stream->metadata_flag ? 1 : 0);
+ if (ret < 0) {
+ ERR("Failed to flush stream %" PRIu64 " during channel rotation",
+ stream->key);
+ 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");
+ ret = lttng_consumer_take_snapshot(stream);
+ if (ret < 0 && ret != -ENODATA && ret != -EAGAIN) {
+ ERR("Failed to sample snapshot position during channel rotation");
goto end_unlock_stream;
}
+ if (!ret) {
+ ret = lttng_consumer_get_produced_snapshot(stream,
+ &produced_pos);
+ 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) {
+ ret = lttng_consumer_get_consumed_snapshot(stream,
+ &consumed_pos);
+ if (ret < 0) {
+ ERR("Failed to sample consumed position during channel rotation");
+ goto end_unlock_stream;
+ }
+ }
+ /*
+ * Align produced position on the start-of-packet boundary of the first
+ * packet going into the next trace chunk.
+ */
+ produced_pos = ALIGN_FLOOR(produced_pos, stream->max_sb_size);
+ if (consumed_pos == produced_pos) {
+ DBG("Set rotate ready for stream %" PRIu64 " produced = %lu consumed = %lu",
+ stream->key, produced_pos, consumed_pos);
stream->rotate_ready = true;
+ } else {
+ DBG("Different consumed and produced positions "
+ "for stream %" PRIu64 " produced = %lu consumed = %lu",
+ stream->key, produced_pos, consumed_pos);
}
-
/*
- * Active flush; has no effect if the production position
- * is at a packet boundary.
+ * The rotation position is based on the packet_seq_num of the
+ * packet following the last packet that was consumed for this
+ * stream, incremented by the offset between produced and
+ * consumed positions. This rotation position is a lower bound
+ * (inclusive) at which the next trace chunk starts. Since it
+ * is a lower bound, it is OK if the packet_seq_num does not
+ * correspond exactly to the same packet identified by the
+ * consumed_pos, which can happen in overwrite mode.
*/
- ret = consumer_flush_buffer(stream, 1);
- if (ret < 0) {
- ERR("Failed to flush stream %" PRIu64 " during channel rotation",
+ if (stream->sequence_number_unavailable) {
+ /*
+ * Rotation should never be performed on a session which
+ * interacts with a pre-2.8 lttng-modules, which does
+ * not implement packet sequence number.
+ */
+ ERR("Failure to rotate stream %" PRIu64 ": sequence number unavailable",
stream->key);
+ ret = -1;
goto end_unlock_stream;
}
+ stream->rotate_position = stream->last_sequence_number + 1 +
+ ((produced_pos - consumed_pos) / stream->max_sb_size);
+ DBG("Set rotation position for stream %" PRIu64 " at position %" PRIu64,
+ stream->key, stream->rotate_position);
if (!is_local_trace) {
/*
* The relay daemon control protocol expects a rotation
* position as "the sequence number of the first packet
- * _after_ the current trace chunk.
- *
- * At the moment when the positions of the buffers are
- * sampled, the production position does not necessarily
- * sit at a packet boundary. The 'active' flush
- * operation above will push the production position to
- * the next packet boundary _if_ it is not already
- * sitting at such a boundary.
- *
- * Assuming a current production position that is not
- * on the bound of a packet, the 'target' sequence
- * number is
- * (consumed_pos / subbuffer_size) + 1
- * Note the '+ 1' to ensure the current packet is
- * part of the current trace chunk.
- *
- * However, if the production position is already at
- * a packet boundary, the '+ 1' is not necessary as the
- * last packet of the current chunk is already
- * 'complete'.
+ * _after_ the current trace chunk".
*/
const struct relayd_stream_rotation_position position = {
.stream_id = stream->relayd_stream_id,
- .rotate_at_seq_num = (stream->rotate_position / stream->max_sb_size) +
- !!(stream->rotate_position % stream->max_sb_size),
+ .rotate_at_seq_num = stream->rotate_position,
};
ret = lttng_dynamic_array_add_element(
return ret;
}
-/*
- * Check if a stream is ready to be rotated after extracting it.
- *
- * Return 1 if it is ready for rotation, 0 if it is not, a negative value on
- * error. Stream lock must be held.
- */
-int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream *stream)
+static
+int consumer_clear_buffer(struct lttng_consumer_stream *stream)
{
- int ret;
- unsigned long consumed_pos;
+ int ret = 0;
+ unsigned long consumed_pos_before, consumed_pos_after;
- if (!stream->rotate_position && !stream->rotate_ready) {
- ret = 0;
+ ret = lttng_consumer_sample_snapshot_positions(stream);
+ if (ret < 0) {
+ ERR("Taking snapshot positions");
goto end;
}
- if (stream->rotate_ready) {
- ret = 1;
+ ret = lttng_consumer_get_consumed_snapshot(stream, &consumed_pos_before);
+ if (ret < 0) {
+ ERR("Consumed snapshot position");
goto end;
}
- /*
- * If we don't have the rotate_ready flag, check the consumed position
- * to determine if we need to rotate.
- */
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER_KERNEL:
+ ret = kernctl_buffer_clear(stream->wait_fd);
+ if (ret < 0) {
+ ERR("Failed to clear kernel stream (ret = %d)", ret);
+ goto end;
+ }
+ break;
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ lttng_ustconsumer_clear_buffer(stream);
+ break;
+ default:
+ ERR("Unknown consumer_data type");
+ abort();
+ }
+
ret = lttng_consumer_sample_snapshot_positions(stream);
if (ret < 0) {
ERR("Taking snapshot positions");
goto end;
}
-
- ret = lttng_consumer_get_consumed_snapshot(stream, &consumed_pos);
+ ret = lttng_consumer_get_consumed_snapshot(stream, &consumed_pos_after);
if (ret < 0) {
ERR("Consumed snapshot position");
goto end;
}
+ DBG("clear: before: %lu after: %lu", consumed_pos_before, consumed_pos_after);
+end:
+ return ret;
+}
- /* Rotate position not reached yet (with check for overflow). */
- if ((long) (consumed_pos - stream->rotate_position) < 0) {
- ret = 0;
- goto end;
+static
+int consumer_clear_stream(struct lttng_consumer_stream *stream)
+{
+ int ret;
+
+ ret = consumer_flush_buffer(stream, 1);
+ if (ret < 0) {
+ ERR("Failed to flush stream %" PRIu64 " during channel clear",
+ stream->key);
+ ret = LTTCOMM_CONSUMERD_FATAL;
+ goto error;
}
- ret = 1;
-end:
+ ret = consumer_clear_buffer(stream);
+ if (ret < 0) {
+ ERR("Failed to clear stream %" PRIu64 " during channel clear",
+ stream->key);
+ ret = LTTCOMM_CONSUMERD_FATAL;
+ goto error;
+ }
+
+ ret = LTTCOMM_CONSUMERD_SUCCESS;
+error:
return ret;
}
+static
+int consumer_clear_unmonitored_channel(struct lttng_consumer_channel *channel)
+{
+ int ret;
+ struct lttng_consumer_stream *stream;
+
+ rcu_read_lock();
+ pthread_mutex_lock(&channel->lock);
+ cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
+ health_code_update();
+ pthread_mutex_lock(&stream->lock);
+ ret = consumer_clear_stream(stream);
+ if (ret) {
+ goto error_unlock;
+ }
+ pthread_mutex_unlock(&stream->lock);
+ }
+ pthread_mutex_unlock(&channel->lock);
+ rcu_read_unlock();
+ return 0;
+
+error_unlock:
+ pthread_mutex_unlock(&stream->lock);
+ pthread_mutex_unlock(&channel->lock);
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Check if a stream is ready to be rotated after extracting it.
+ *
+ * Return 1 if it is ready for rotation, 0 if it is not, a negative value on
+ * error. Stream lock must be held.
+ */
+int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream *stream)
+{
+ DBG("Check is rotate ready for stream %" PRIu64
+ " ready %u rotate_position %" PRIu64
+ " last_sequence_number %" PRIu64,
+ stream->key, stream->rotate_ready,
+ stream->rotate_position, stream->last_sequence_number);
+ if (stream->rotate_ready) {
+ return 1;
+ }
+
+ /*
+ * If packet seq num is unavailable, it means we are interacting
+ * with a pre-2.8 lttng-modules which does not implement the
+ * sequence number. Rotation should never be used by sessiond in this
+ * scenario.
+ */
+ if (stream->sequence_number_unavailable) {
+ ERR("Internal error: rotation used on stream %" PRIu64
+ " with unavailable sequence number",
+ stream->key);
+ return -1;
+ }
+
+ if (stream->rotate_position == -1ULL ||
+ stream->last_sequence_number == -1ULL) {
+ return 0;
+ }
+
+ /*
+ * Rotate position not reached yet. The stream rotate position is
+ * the position of the next packet belonging to the next trace chunk,
+ * but consumerd considers rotation ready when reaching the last
+ * packet of the current chunk, hence the "rotate_position - 1".
+ */
+
+ DBG("Check is rotate ready for stream %" PRIu64
+ " last_sequence_number %" PRIu64
+ " rotate_position %" PRIu64,
+ stream->key, stream->last_sequence_number,
+ stream->rotate_position);
+ if (stream->last_sequence_number >= stream->rotate_position - 1) {
+ return 1;
+ }
+
+ return 0;
+}
+
/*
* Reset the state for a stream after a rotation occurred.
*/
void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream *stream)
{
- stream->rotate_position = 0;
+ DBG("lttng_consumer_reset_stream_rotate_state for stream %" PRIu64,
+ stream->key);
+ stream->rotate_position = -1ULL;
stream->rotate_ready = false;
}
* and LTTNG_CONSUMER_DESTROY_TRACE_CHUNK commands.
*/
created_chunk = lttng_trace_chunk_create(chunk_id,
- chunk_creation_timestamp);
+ chunk_creation_timestamp, NULL);
if (!created_chunk) {
ERR("Failed to create trace chunk");
ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
*/
chunk_status = lttng_trace_chunk_set_as_user(created_chunk,
chunk_directory_handle);
+ chunk_directory_handle = NULL;
if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
ERR("Failed to set trace chunk's directory handle");
ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
end:
return ret_code;
}
+
+static
+int consumer_clear_monitored_channel(struct lttng_consumer_channel *channel)
+{
+ struct lttng_ht *ht;
+ struct lttng_consumer_stream *stream;
+ struct lttng_ht_iter iter;
+ int ret;
+
+ ht = consumer_data.stream_per_chan_id_ht;
+
+ rcu_read_lock();
+ 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) {
+ /*
+ * Protect against teardown with mutex.
+ */
+ pthread_mutex_lock(&stream->lock);
+ if (cds_lfht_is_node_deleted(&stream->node.node)) {
+ goto next;
+ }
+ ret = consumer_clear_stream(stream);
+ if (ret) {
+ goto error_unlock;
+ }
+ next:
+ pthread_mutex_unlock(&stream->lock);
+ }
+ rcu_read_unlock();
+ return LTTCOMM_CONSUMERD_SUCCESS;
+
+error_unlock:
+ pthread_mutex_unlock(&stream->lock);
+ rcu_read_unlock();
+ return ret;
+}
+
+int lttng_consumer_clear_channel(struct lttng_consumer_channel *channel)
+{
+ int ret;
+
+ DBG("Consumer clear channel %" PRIu64, channel->key);
+
+ if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) {
+ /*
+ * Nothing to do for the metadata channel/stream.
+ * Snapshot mechanism already take care of the metadata
+ * handling/generation, and monitored channels only need to
+ * have their data stream cleared..
+ */
+ ret = LTTCOMM_CONSUMERD_SUCCESS;
+ goto end;
+ }
+
+ if (!channel->monitor) {
+ ret = consumer_clear_unmonitored_channel(channel);
+ } else {
+ ret = consumer_clear_monitored_channel(channel);
+ }
+end:
+ return ret;
+}
projects / lttng-tools.git / blobdiff