#include <common/relayd/relayd.h>
#include <common/ust-consumer/ust-consumer.h>
#include <common/utils.h>
+#include <common/consumer/consumer.h>
+#include <common/consumer/consumer-timer.h>
#include "consumer-stream.h"
free(stream);
}
+static void consumer_stream_data_lock_all(struct lttng_consumer_stream *stream)
+{
+ pthread_mutex_lock(&stream->chan->lock);
+ pthread_mutex_lock(&stream->lock);
+}
+
+static void consumer_stream_data_unlock_all(struct lttng_consumer_stream *stream)
+{
+ pthread_mutex_unlock(&stream->lock);
+ pthread_mutex_unlock(&stream->chan->lock);
+}
+
+static void consumer_stream_metadata_lock_all(struct lttng_consumer_stream *stream)
+{
+ consumer_stream_data_lock_all(stream);
+ pthread_mutex_lock(&stream->metadata_rdv_lock);
+}
+
+static void consumer_stream_metadata_unlock_all(struct lttng_consumer_stream *stream)
+{
+ pthread_mutex_unlock(&stream->metadata_rdv_lock);
+ consumer_stream_data_unlock_all(stream);
+}
+
+/* Only used for data streams. */
+static int consumer_stream_update_stats(struct lttng_consumer_stream *stream,
+ const struct stream_subbuffer *subbuf)
+{
+ int ret = 0;
+ uint64_t sequence_number;
+ const uint64_t discarded_events =
+ LTTNG_OPTIONAL_GET(subbuf->info.data.sequence_number);
+
+ if (!subbuf->info.data.sequence_number.is_set) {
+ /* Command not supported by the tracer. */
+ sequence_number = -1ULL;
+ stream->sequence_number_unavailable = true;
+ } else {
+ sequence_number = subbuf->info.data.sequence_number.value;
+ }
+
+ /*
+ * Start the sequence when we extract the first packet in case we don't
+ * start at 0 (for example if a consumer is not connected to the
+ * session immediately after the beginning).
+ */
+ if (stream->last_sequence_number == -1ULL) {
+ stream->last_sequence_number = sequence_number;
+ } else if (sequence_number > stream->last_sequence_number) {
+ stream->chan->lost_packets += sequence_number -
+ stream->last_sequence_number - 1;
+ } else {
+ /* seq <= last_sequence_number */
+ ERR("Sequence number inconsistent : prev = %" PRIu64
+ ", current = %" PRIu64,
+ stream->last_sequence_number, sequence_number);
+ ret = -1;
+ goto end;
+ }
+ stream->last_sequence_number = sequence_number;
+
+ if (discarded_events < stream->last_discarded_events) {
+ /*
+ * Overflow has occurred. We assume only one wrap-around
+ * has occurred.
+ */
+ stream->chan->discarded_events +=
+ (1ULL << (CAA_BITS_PER_LONG - 1)) -
+ stream->last_discarded_events +
+ discarded_events;
+ } else {
+ stream->chan->discarded_events += discarded_events -
+ stream->last_discarded_events;
+ }
+ stream->last_discarded_events = discarded_events;
+ ret = 0;
+
+end:
+ return ret;
+}
+
+static
+void ctf_packet_index_populate(struct ctf_packet_index *index,
+ off_t offset, const struct stream_subbuffer *subbuffer)
+{
+ *index = (typeof(*index)){
+ .offset = htobe64(offset),
+ .packet_size = htobe64(subbuffer->info.data.packet_size),
+ .content_size = htobe64(subbuffer->info.data.content_size),
+ .timestamp_begin = htobe64(
+ subbuffer->info.data.timestamp_begin),
+ .timestamp_end = htobe64(
+ subbuffer->info.data.timestamp_end),
+ .events_discarded = htobe64(
+ subbuffer->info.data.events_discarded),
+ .stream_id = htobe64(subbuffer->info.data.stream_id),
+ .stream_instance_id = htobe64(
+ subbuffer->info.data.stream_instance_id.is_set ?
+ subbuffer->info.data.stream_instance_id.value : -1ULL),
+ .packet_seq_num = htobe64(
+ subbuffer->info.data.sequence_number.is_set ?
+ subbuffer->info.data.sequence_number.value : -1ULL),
+ };
+}
+
+static ssize_t consumer_stream_consume_mmap(
+ struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_stream *stream,
+ const struct stream_subbuffer *subbuffer)
+{
+ const unsigned long padding_size =
+ subbuffer->info.data.padded_subbuf_size -
+ subbuffer->info.data.subbuf_size;
+
+ return lttng_consumer_on_read_subbuffer_mmap(
+ ctx, stream, &subbuffer->buffer.buffer, padding_size);
+}
+
+static ssize_t consumer_stream_consume_splice(
+ struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_stream *stream,
+ const struct stream_subbuffer *subbuffer)
+{
+ return lttng_consumer_on_read_subbuffer_splice(ctx, stream,
+ subbuffer->info.data.padded_subbuf_size, 0);
+}
+
+static int consumer_stream_send_index(
+ struct lttng_consumer_stream *stream,
+ const struct stream_subbuffer *subbuffer,
+ struct lttng_consumer_local_data *ctx)
+{
+ off_t packet_offset = 0;
+ struct ctf_packet_index index = {};
+
+ /*
+ * This is called after consuming the sub-buffer; substract the
+ * effect this sub-buffer from the offset.
+ */
+ if (stream->net_seq_idx == (uint64_t) -1ULL) {
+ packet_offset = stream->out_fd_offset -
+ subbuffer->info.data.padded_subbuf_size;
+ }
+
+ ctf_packet_index_populate(&index, packet_offset, subbuffer);
+ return consumer_stream_write_index(stream, &index);
+}
+
+/*
+ * Actually do the metadata sync using the given metadata stream.
+ *
+ * Return 0 on success else a negative value. ENODATA can be returned also
+ * indicating that there is no metadata available for that stream.
+ */
+static int do_sync_metadata(struct lttng_consumer_stream *metadata,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret;
+
+ assert(metadata);
+ assert(metadata->metadata_flag);
+ assert(ctx);
+
+ /*
+ * In UST, since we have to write the metadata from the cache packet
+ * by packet, we might need to start this procedure multiple times
+ * until all the metadata from the cache has been extracted.
+ */
+ do {
+ /*
+ * Steps :
+ * - Lock the metadata stream
+ * - Check if metadata stream node was deleted before locking.
+ * - if yes, release and return success
+ * - Check if new metadata is ready (flush + snapshot pos)
+ * - If nothing : release and return.
+ * - Lock the metadata_rdv_lock
+ * - Unlock the metadata stream
+ * - cond_wait on metadata_rdv to wait the wakeup from the
+ * metadata thread
+ * - Unlock the metadata_rdv_lock
+ */
+ pthread_mutex_lock(&metadata->lock);
+
+ /*
+ * There is a possibility that we were able to acquire a reference on the
+ * stream from the RCU hash table but between then and now, the node might
+ * have been deleted just before the lock is acquired. Thus, after locking,
+ * we make sure the metadata node has not been deleted which means that the
+ * buffers are closed.
+ *
+ * In that case, there is no need to sync the metadata hence returning a
+ * success return code.
+ */
+ ret = cds_lfht_is_node_deleted(&metadata->node.node);
+ if (ret) {
+ ret = 0;
+ goto end_unlock_mutex;
+ }
+
+ switch (ctx->type) {
+ case LTTNG_CONSUMER_KERNEL:
+ /*
+ * Empty the metadata cache and flush the current stream.
+ */
+ ret = lttng_kconsumer_sync_metadata(metadata);
+ break;
+ case LTTNG_CONSUMER32_UST:
+ case LTTNG_CONSUMER64_UST:
+ /*
+ * Ask the sessiond if we have new metadata waiting and update the
+ * consumer metadata cache.
+ */
+ ret = lttng_ustconsumer_sync_metadata(ctx, metadata);
+ break;
+ default:
+ assert(0);
+ ret = -1;
+ break;
+ }
+ /*
+ * Error or no new metadata, we exit here.
+ */
+ if (ret <= 0 || ret == ENODATA) {
+ goto end_unlock_mutex;
+ }
+
+ /*
+ * At this point, new metadata have been flushed, so we wait on the
+ * rendez-vous point for the metadata thread to wake us up when it
+ * finishes consuming the metadata and continue execution.
+ */
+
+ pthread_mutex_lock(&metadata->metadata_rdv_lock);
+
+ /*
+ * Release metadata stream lock so the metadata thread can process it.
+ */
+ pthread_mutex_unlock(&metadata->lock);
+
+ /*
+ * Wait on the rendez-vous point. Once woken up, it means the metadata was
+ * consumed and thus synchronization is achieved.
+ */
+ pthread_cond_wait(&metadata->metadata_rdv, &metadata->metadata_rdv_lock);
+ pthread_mutex_unlock(&metadata->metadata_rdv_lock);
+ } while (ret == EAGAIN);
+
+ /* Success */
+ return 0;
+
+end_unlock_mutex:
+ pthread_mutex_unlock(&metadata->lock);
+ return ret;
+}
+
+/*
+ * Synchronize the metadata using a given session ID. A successful acquisition
+ * of a metadata stream will trigger a request to the session daemon and a
+ * snapshot so the metadata thread can consume it.
+ *
+ * This function call is a rendez-vous point between the metadata thread and
+ * the data thread.
+ *
+ * Return 0 on success or else a negative value.
+ */
+int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx,
+ uint64_t session_id)
+{
+ int ret;
+ struct lttng_consumer_stream *stream = NULL;
+ struct lttng_ht_iter iter;
+ struct lttng_ht *ht;
+
+ assert(ctx);
+
+ /* Ease our life a bit. */
+ ht = consumer_data.stream_list_ht;
+
+ rcu_read_lock();
+
+ /* Search the metadata associated with the session id of the given stream. */
+
+ cds_lfht_for_each_entry_duplicate(ht->ht,
+ ht->hash_fct(&session_id, lttng_ht_seed), ht->match_fct,
+ &session_id, &iter.iter, stream, node_session_id.node) {
+ if (!stream->metadata_flag) {
+ continue;
+ }
+
+ ret = do_sync_metadata(stream, ctx);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ /*
+ * Force return code to 0 (success) since ret might be ENODATA for instance
+ * which is not an error but rather that we should come back.
+ */
+ ret = 0;
+
+end:
+ rcu_read_unlock();
+ return ret;
+}
+
+static int consumer_stream_sync_metadata_index(
+ struct lttng_consumer_stream *stream,
+ const struct stream_subbuffer *subbuffer,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret;
+
+ /* Block until all the metadata is sent. */
+ pthread_mutex_lock(&stream->metadata_timer_lock);
+ assert(!stream->missed_metadata_flush);
+ stream->waiting_on_metadata = true;
+ pthread_mutex_unlock(&stream->metadata_timer_lock);
+
+ ret = consumer_stream_sync_metadata(ctx, stream->session_id);
+
+ pthread_mutex_lock(&stream->metadata_timer_lock);
+ stream->waiting_on_metadata = false;
+ if (stream->missed_metadata_flush) {
+ stream->missed_metadata_flush = false;
+ pthread_mutex_unlock(&stream->metadata_timer_lock);
+ (void) stream->read_subbuffer_ops.send_live_beacon(stream);
+ } else {
+ pthread_mutex_unlock(&stream->metadata_timer_lock);
+ }
+ if (ret < 0) {
+ goto end;
+ }
+
+ ret = consumer_stream_send_index(stream, subbuffer, ctx);
+end:
+ return ret;
+}
+
+/*
+ * Check if the local version of the metadata stream matches with the version
+ * of the metadata stream in the kernel. If it was updated, set the reset flag
+ * on the stream.
+ */
+static
+int metadata_stream_check_version(struct lttng_consumer_stream *stream,
+ const struct stream_subbuffer *subbuffer)
+{
+ if (stream->metadata_version == subbuffer->info.metadata.version) {
+ goto end;
+ }
+
+ DBG("New metadata version detected");
+ stream->metadata_version = subbuffer->info.metadata.version;
+ stream->reset_metadata_flag = 1;
+
+ if (stream->read_subbuffer_ops.reset_metadata) {
+ stream->read_subbuffer_ops.reset_metadata(stream);
+ }
+
+end:
+ return 0;
+}
+
+struct lttng_consumer_stream *consumer_stream_create(
+ struct lttng_consumer_channel *channel,
+ uint64_t channel_key,
+ uint64_t stream_key,
+ const char *channel_name,
+ uint64_t relayd_id,
+ uint64_t session_id,
+ struct lttng_trace_chunk *trace_chunk,
+ int cpu,
+ int *alloc_ret,
+ enum consumer_channel_type type,
+ unsigned int monitor)
+{
+ int ret;
+ struct lttng_consumer_stream *stream;
+
+ stream = zmalloc(sizeof(*stream));
+ if (stream == NULL) {
+ PERROR("malloc struct lttng_consumer_stream");
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ if (trace_chunk && !lttng_trace_chunk_get(trace_chunk)) {
+ ERR("Failed to acquire trace chunk reference during the creation of a stream");
+ ret = -1;
+ goto error;
+ }
+
+ rcu_read_lock();
+ stream->chan = channel;
+ stream->key = stream_key;
+ stream->trace_chunk = trace_chunk;
+ stream->out_fd = -1;
+ stream->out_fd_offset = 0;
+ stream->output_written = 0;
+ stream->net_seq_idx = relayd_id;
+ stream->session_id = session_id;
+ stream->monitor = monitor;
+ 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);
+
+ /* If channel is the metadata, flag this stream as metadata. */
+ if (type == CONSUMER_CHANNEL_TYPE_METADATA) {
+ stream->metadata_flag = 1;
+ /* Metadata is flat out. */
+ strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name));
+ /* Live rendez-vous point. */
+ pthread_cond_init(&stream->metadata_rdv, NULL);
+ pthread_mutex_init(&stream->metadata_rdv_lock, NULL);
+ } else {
+ /* Format stream name to <channel_name>_<cpu_number> */
+ ret = snprintf(stream->name, sizeof(stream->name), "%s_%d",
+ channel_name, cpu);
+ if (ret < 0) {
+ PERROR("snprintf stream name");
+ goto error;
+ }
+ }
+
+ switch (channel->output) {
+ case CONSUMER_CHANNEL_SPLICE:
+ stream->output = LTTNG_EVENT_SPLICE;
+ ret = utils_create_pipe(stream->splice_pipe);
+ if (ret < 0) {
+ goto error;
+ }
+ break;
+ case CONSUMER_CHANNEL_MMAP:
+ stream->output = LTTNG_EVENT_MMAP;
+ break;
+ default:
+ abort();
+ }
+
+ /* Key is always the wait_fd for streams. */
+ lttng_ht_node_init_u64(&stream->node, stream->key);
+
+ /* Init node per channel id key */
+ lttng_ht_node_init_u64(&stream->node_channel_id, channel_key);
+
+ /* Init session id node with the stream session id */
+ lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id);
+
+ DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64
+ " relayd_id %" PRIu64 ", session_id %" PRIu64,
+ stream->name, stream->key, channel_key,
+ stream->net_seq_idx, stream->session_id);
+
+ rcu_read_unlock();
+
+ if (type == CONSUMER_CHANNEL_TYPE_METADATA) {
+ stream->read_subbuffer_ops.lock =
+ consumer_stream_metadata_lock_all;
+ stream->read_subbuffer_ops.unlock =
+ consumer_stream_metadata_unlock_all;
+ stream->read_subbuffer_ops.pre_consume_subbuffer =
+ metadata_stream_check_version;
+ } else {
+ stream->read_subbuffer_ops.lock = consumer_stream_data_lock_all;
+ stream->read_subbuffer_ops.unlock =
+ consumer_stream_data_unlock_all;
+ stream->read_subbuffer_ops.pre_consume_subbuffer =
+ consumer_stream_update_stats;
+ if (channel->is_live) {
+ stream->read_subbuffer_ops.post_consume =
+ consumer_stream_sync_metadata_index;
+ } else {
+ stream->read_subbuffer_ops.post_consume =
+ consumer_stream_send_index;
+ }
+ }
+
+ if (channel->output == CONSUMER_CHANNEL_MMAP) {
+ stream->read_subbuffer_ops.consume_subbuffer =
+ consumer_stream_consume_mmap;
+ } else {
+ stream->read_subbuffer_ops.consume_subbuffer =
+ consumer_stream_consume_splice;
+ }
+
+ return stream;
+
+error:
+ rcu_read_unlock();
+ lttng_trace_chunk_put(stream->trace_chunk);
+ free(stream);
+end:
+ if (alloc_ret) {
+ *alloc_ret = ret;
+ }
+ return NULL;
+}
+
/*
* Close stream on the relayd side. This call can destroy a relayd if the
* conditions are met.
return ret;
}
-/*
- * Actually do the metadata sync using the given metadata stream.
- *
- * Return 0 on success else a negative value. ENODATA can be returned also
- * indicating that there is no metadata available for that stream.
- */
-static int do_sync_metadata(struct lttng_consumer_stream *metadata,
- struct lttng_consumer_local_data *ctx)
-{
- int ret;
-
- assert(metadata);
- assert(metadata->metadata_flag);
- assert(ctx);
-
- /*
- * In UST, since we have to write the metadata from the cache packet
- * by packet, we might need to start this procedure multiple times
- * until all the metadata from the cache has been extracted.
- */
- do {
- /*
- * Steps :
- * - Lock the metadata stream
- * - Check if metadata stream node was deleted before locking.
- * - if yes, release and return success
- * - Check if new metadata is ready (flush + snapshot pos)
- * - If nothing : release and return.
- * - Lock the metadata_rdv_lock
- * - Unlock the metadata stream
- * - cond_wait on metadata_rdv to wait the wakeup from the
- * metadata thread
- * - Unlock the metadata_rdv_lock
- */
- pthread_mutex_lock(&metadata->lock);
-
- /*
- * There is a possibility that we were able to acquire a reference on the
- * stream from the RCU hash table but between then and now, the node might
- * have been deleted just before the lock is acquired. Thus, after locking,
- * we make sure the metadata node has not been deleted which means that the
- * buffers are closed.
- *
- * In that case, there is no need to sync the metadata hence returning a
- * success return code.
- */
- ret = cds_lfht_is_node_deleted(&metadata->node.node);
- if (ret) {
- ret = 0;
- goto end_unlock_mutex;
- }
-
- switch (ctx->type) {
- case LTTNG_CONSUMER_KERNEL:
- /*
- * Empty the metadata cache and flush the current stream.
- */
- ret = lttng_kconsumer_sync_metadata(metadata);
- break;
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- /*
- * Ask the sessiond if we have new metadata waiting and update the
- * consumer metadata cache.
- */
- ret = lttng_ustconsumer_sync_metadata(ctx, metadata);
- break;
- default:
- assert(0);
- ret = -1;
- break;
- }
- /*
- * Error or no new metadata, we exit here.
- */
- if (ret <= 0 || ret == ENODATA) {
- goto end_unlock_mutex;
- }
-
- /*
- * At this point, new metadata have been flushed, so we wait on the
- * rendez-vous point for the metadata thread to wake us up when it
- * finishes consuming the metadata and continue execution.
- */
-
- pthread_mutex_lock(&metadata->metadata_rdv_lock);
-
- /*
- * Release metadata stream lock so the metadata thread can process it.
- */
- pthread_mutex_unlock(&metadata->lock);
-
- /*
- * Wait on the rendez-vous point. Once woken up, it means the metadata was
- * consumed and thus synchronization is achieved.
- */
- pthread_cond_wait(&metadata->metadata_rdv, &metadata->metadata_rdv_lock);
- pthread_mutex_unlock(&metadata->metadata_rdv_lock);
- } while (ret == EAGAIN);
-
- /* Success */
- return 0;
-
-end_unlock_mutex:
- pthread_mutex_unlock(&metadata->lock);
- return ret;
-}
-
-/*
- * Synchronize the metadata using a given session ID. A successful acquisition
- * of a metadata stream will trigger a request to the session daemon and a
- * snapshot so the metadata thread can consume it.
- *
- * This function call is a rendez-vous point between the metadata thread and
- * the data thread.
- *
- * Return 0 on success or else a negative value.
- */
-int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx,
- uint64_t session_id)
-{
- int ret;
- struct lttng_consumer_stream *stream = NULL;
- struct lttng_ht_iter iter;
- struct lttng_ht *ht;
-
- assert(ctx);
-
- /* Ease our life a bit. */
- ht = consumer_data.stream_list_ht;
-
- rcu_read_lock();
-
- /* Search the metadata associated with the session id of the given stream. */
-
- cds_lfht_for_each_entry_duplicate(ht->ht,
- ht->hash_fct(&session_id, lttng_ht_seed), ht->match_fct,
- &session_id, &iter.iter, stream, node_session_id.node) {
- if (!stream->metadata_flag) {
- continue;
- }
-
- ret = do_sync_metadata(stream, ctx);
- if (ret < 0) {
- goto end;
- }
- }
-
- /*
- * Force return code to 0 (success) since ret might be ENODATA for instance
- * which is not an error but rather that we should come back.
- */
- ret = 0;
-
-end:
- rcu_read_unlock();
- return ret;
-}
-
int consumer_stream_create_output_files(struct lttng_consumer_stream *stream,
bool create_index)
{
#include "consumer.h"
+/*
+ * Create a consumer stream.
+ *
+ * The channel lock MUST be acquired.
+ */
+struct lttng_consumer_stream *consumer_stream_create(
+ struct lttng_consumer_channel *channel,
+ uint64_t channel_key,
+ uint64_t stream_key,
+ const char *channel_name,
+ uint64_t relayd_id,
+ uint64_t session_id,
+ struct lttng_trace_chunk *trace_chunk,
+ int cpu,
+ int *alloc_ret,
+ enum consumer_channel_type type,
+ unsigned int monitor);
+
/*
* Close stream's file descriptors and, if needed, close stream also on the
* relayd side.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#include "common/index/ctf-index.h"
#define _LGPL_SOURCE
#include <assert.h>
#include <poll.h>
channel->tracefile_size;
}
-struct lttng_consumer_stream *consumer_allocate_stream(
- struct lttng_consumer_channel *channel,
- uint64_t channel_key,
- uint64_t stream_key,
- const char *channel_name,
- uint64_t relayd_id,
- uint64_t session_id,
- struct lttng_trace_chunk *trace_chunk,
- int cpu,
- int *alloc_ret,
- enum consumer_channel_type type,
- unsigned int monitor)
-{
- int ret;
- struct lttng_consumer_stream *stream;
-
- stream = zmalloc(sizeof(*stream));
- if (stream == NULL) {
- PERROR("malloc struct lttng_consumer_stream");
- ret = -ENOMEM;
- goto end;
- }
-
- if (trace_chunk && !lttng_trace_chunk_get(trace_chunk)) {
- ERR("Failed to acquire trace chunk reference during the creation of a stream");
- ret = -1;
- goto error;
- }
-
- rcu_read_lock();
- stream->chan = channel;
- stream->key = stream_key;
- stream->trace_chunk = trace_chunk;
- stream->out_fd = -1;
- stream->out_fd_offset = 0;
- stream->output_written = 0;
- stream->net_seq_idx = relayd_id;
- stream->session_id = session_id;
- stream->monitor = monitor;
- 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);
-
- /* If channel is the metadata, flag this stream as metadata. */
- if (type == CONSUMER_CHANNEL_TYPE_METADATA) {
- stream->metadata_flag = 1;
- /* Metadata is flat out. */
- strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name));
- /* Live rendez-vous point. */
- pthread_cond_init(&stream->metadata_rdv, NULL);
- pthread_mutex_init(&stream->metadata_rdv_lock, NULL);
- } else {
- /* Format stream name to <channel_name>_<cpu_number> */
- ret = snprintf(stream->name, sizeof(stream->name), "%s_%d",
- channel_name, cpu);
- if (ret < 0) {
- PERROR("snprintf stream name");
- goto error;
- }
- }
-
- /* Key is always the wait_fd for streams. */
- lttng_ht_node_init_u64(&stream->node, stream->key);
-
- /* Init node per channel id key */
- lttng_ht_node_init_u64(&stream->node_channel_id, channel_key);
-
- /* Init session id node with the stream session id */
- lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id);
-
- DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64
- " relayd_id %" PRIu64 ", session_id %" PRIu64,
- stream->name, stream->key, channel_key,
- stream->net_seq_idx, stream->session_id);
-
- rcu_read_unlock();
- return stream;
-
-error:
- rcu_read_unlock();
- lttng_trace_chunk_put(stream->trace_chunk);
- free(stream);
-end:
- if (alloc_ret) {
- *alloc_ret = ret;
- }
- return NULL;
-}
-
/*
* Add a stream to the global list protected by a mutex.
*/
struct lttng_consumer_local_data *lttng_consumer_create(
enum lttng_consumer_type type,
ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx),
+ struct lttng_consumer_local_data *ctx, bool locked_by_caller),
int (*recv_channel)(struct lttng_consumer_channel *channel),
int (*recv_stream)(struct lttng_consumer_stream *stream),
int (*update_stream)(uint64_t stream_key, uint32_t state))
struct lttng_consumer_local_data *ctx,
struct lttng_consumer_stream *stream,
const struct lttng_buffer_view *buffer,
- unsigned long padding,
- struct ctf_packet_index *index)
+ unsigned long padding)
{
ssize_t ret = 0;
off_t orig_offset = stream->out_fd_offset;
orig_offset = 0;
}
stream->tracefile_size_current += buffer->size;
- if (index) {
- index->offset = htobe64(stream->out_fd_offset);
- }
-
write_len = buffer->size;
}
ssize_t lttng_consumer_on_read_subbuffer_splice(
struct lttng_consumer_local_data *ctx,
struct lttng_consumer_stream *stream, unsigned long len,
- unsigned long padding,
- struct ctf_packet_index *index)
+ unsigned long padding)
{
ssize_t ret = 0, written = 0, ret_splice = 0;
loff_t offset = 0;
orig_offset = 0;
}
stream->tracefile_size_current += len;
- index->offset = htobe64(stream->out_fd_offset);
}
while (len > 0) {
do {
health_code_update();
- len = ctx->on_buffer_ready(stream, ctx);
+ len = ctx->on_buffer_ready(stream, ctx, false);
/*
* We don't check the return value here since if we get
* a negative len, it means an error occurred thus we
do {
health_code_update();
- len = ctx->on_buffer_ready(stream, ctx);
+ len = ctx->on_buffer_ready(stream, ctx, false);
/*
* We don't check the return value here since if we get
* a negative len, it means an error occurred thus we
if (pollfd[i].revents & POLLPRI) {
DBG("Urgent read on fd %d", pollfd[i].fd);
high_prio = 1;
- len = ctx->on_buffer_ready(local_stream[i], ctx);
+ len = ctx->on_buffer_ready(local_stream[i], ctx, false);
/* it's ok to have an unavailable sub-buffer */
if (len < 0 && len != -EAGAIN && len != -ENODATA) {
/* Clean the stream and free it. */
local_stream[i]->hangup_flush_done ||
local_stream[i]->has_data) {
DBG("Normal read on fd %d", pollfd[i].fd);
- len = ctx->on_buffer_ready(local_stream[i], ctx);
+ len = ctx->on_buffer_ready(local_stream[i], ctx, false);
/* it's ok to have an unavailable sub-buffer */
if (len < 0 && len != -EAGAIN && len != -ENODATA) {
/* Clean the stream and free it. */
}
ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx)
+ struct lttng_consumer_local_data *ctx,
+ bool locked_by_caller)
{
- ssize_t ret;
+ ssize_t ret, written_bytes;
int rotation_ret;
+ struct stream_subbuffer subbuffer = {};
- pthread_mutex_lock(&stream->chan->lock);
- pthread_mutex_lock(&stream->lock);
- if (stream->metadata_flag) {
- pthread_mutex_lock(&stream->metadata_rdv_lock);
+ if (!locked_by_caller) {
+ stream->read_subbuffer_ops.lock(stream);
+ }
+
+ if (stream->read_subbuffer_ops.on_wake_up) {
+ ret = stream->read_subbuffer_ops.on_wake_up(stream);
+ if (ret) {
+ goto end;
+ }
}
/*
}
}
- switch (consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- ret = lttng_kconsumer_read_subbuffer(stream, ctx);
- break;
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- ret = lttng_ustconsumer_read_subbuffer(stream, ctx);
- break;
- default:
- ERR("Unknown consumer_data type");
- assert(0);
- ret = -ENOSYS;
- break;
+ ret = stream->read_subbuffer_ops.get_next_subbuffer(stream, &subbuffer);
+ if (ret) {
+ if (ret == -ENODATA) {
+ /* Not an error. */
+ ret = 0;
+ }
+ goto end;
}
- if (ret < 0) {
+ ret = stream->read_subbuffer_ops.pre_consume_subbuffer(
+ stream, &subbuffer);
+ if (ret) {
+ goto error_put_subbuf;
+ }
+
+ written_bytes = stream->read_subbuffer_ops.consume_subbuffer(
+ ctx, stream, &subbuffer);
+ /*
+ * Should write subbuf_size amount of data when network streaming or
+ * the full padded size when we are not streaming.
+ */
+ if ((written_bytes != subbuffer.info.data.subbuf_size &&
+ stream->net_seq_idx != (uint64_t) -1ULL) ||
+ (written_bytes != subbuffer.info.data.padded_subbuf_size &&
+ stream->net_seq_idx ==
+ (uint64_t) -1ULL)) {
+ /*
+ * Display the error but continue processing to try to
+ * release the subbuffer. This is a DBG statement
+ * since this can happen without being a critical
+ * error.
+ */
+ DBG("Failed to write to tracefile (written_bytes: %zd != padded subbuffer size: %lu, subbuffer size: %lu)",
+ written_bytes, subbuffer.info.data.subbuf_size,
+ subbuffer.info.data.padded_subbuf_size);
+ }
+
+ ret = stream->read_subbuffer_ops.put_next_subbuffer(stream, &subbuffer);
+ if (ret) {
goto end;
}
+ if (stream->read_subbuffer_ops.post_consume) {
+ ret = stream->read_subbuffer_ops.post_consume(stream, &subbuffer, ctx);
+ if (ret) {
+ goto end;
+ }
+ }
+
/*
* After extracting the packet, we check if the stream is now ready to
* be rotated and perform the action immediately.
goto end;
}
+ if (stream->read_subbuffer_ops.on_sleep) {
+ stream->read_subbuffer_ops.on_sleep(stream, ctx);
+ }
+
+ ret = written_bytes;
end:
- if (stream->metadata_flag) {
- pthread_cond_broadcast(&stream->metadata_rdv);
- pthread_mutex_unlock(&stream->metadata_rdv_lock);
+ if (!locked_by_caller) {
+ stream->read_subbuffer_ops.unlock(stream);
}
- pthread_mutex_unlock(&stream->lock);
- pthread_mutex_unlock(&stream->chan->lock);
+
return ret;
+error_put_subbuf:
+ (void) stream->read_subbuffer_ops.put_next_subbuffer(stream, &subbuffer);
+ goto end;
}
int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream)
#include <common/credentials.h>
#include <common/buffer-view.h>
+struct lttng_consumer_local_data;
+
/* Commands for consumer */
enum lttng_consumer_command {
LTTNG_CONSUMER_ADD_CHANNEL,
bool streams_sent_to_relayd;
};
+struct stream_subbuffer {
+ union {
+ /*
+ * CONSUMER_CHANNEL_SPLICE
+ * No ownership assumed.
+ */
+ int fd;
+ /* CONSUMER_CHANNEL_MMAP */
+ struct lttng_buffer_view buffer;
+ } buffer;
+ union {
+ /*
+ * Common members are fine to access through either
+ * union entries (as per C11, Common Initial Sequence).
+ */
+ struct {
+ unsigned long subbuf_size;
+ unsigned long padded_subbuf_size;
+ uint64_t version;
+ } metadata;
+ struct {
+ unsigned long subbuf_size;
+ unsigned long padded_subbuf_size;
+ uint64_t packet_size;
+ uint64_t content_size;
+ uint64_t timestamp_begin;
+ uint64_t timestamp_end;
+ uint64_t events_discarded;
+ /* Left unset when unsupported. */
+ LTTNG_OPTIONAL(uint64_t) sequence_number;
+ uint64_t stream_id;
+ /* Left unset when unsupported. */
+ LTTNG_OPTIONAL(uint64_t) stream_instance_id;
+ } data;
+ } info;
+};
+
+/*
+ * Perform any operation required to acknowledge
+ * the wake-up of a consumer stream (e.g. consume a byte on a wake-up pipe).
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef int (*on_wake_up_cb)(struct lttng_consumer_stream *);
+
+/*
+ * Perform any operation required before a consumer stream is put
+ * to sleep before awaiting a data availability notification.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef int (*on_sleep_cb)(struct lttng_consumer_stream *,
+ struct lttng_consumer_local_data *);
+
+/*
+ * Acquire the subbuffer at the current 'consumed' position.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef int (*get_next_subbuffer_cb)(struct lttng_consumer_stream *,
+ struct stream_subbuffer *);
+
+/*
+ * Populate the stream_subbuffer's info member. The info to populate
+ * depends on the type (metadata/data) of the stream.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef int (*extract_subbuffer_info_cb)(
+ struct lttng_consumer_stream *, struct stream_subbuffer *);
+
+/*
+ * Invoked after a subbuffer's info has been filled.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef int (*pre_consume_subbuffer_cb)(struct lttng_consumer_stream *,
+ const struct stream_subbuffer *);
+
+/*
+ * Consume subbuffer contents.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef ssize_t (*consume_subbuffer_cb)(struct lttng_consumer_local_data *,
+ struct lttng_consumer_stream *,
+ const struct stream_subbuffer *);
+
+/*
+ * Release the current subbuffer and advance the 'consumed' position by
+ * one subbuffer.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef int (*put_next_subbuffer_cb)(struct lttng_consumer_stream *,
+ struct stream_subbuffer *);
+
+/*
+ * Invoked after consuming a subbuffer.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef int (*post_consume_cb)(struct lttng_consumer_stream *,
+ const struct stream_subbuffer *,
+ struct lttng_consumer_local_data *);
+
+/*
+ * Send a live beacon if no data is available.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef int (*send_live_beacon_cb)(struct lttng_consumer_stream *);
+
+/*
+ * Lock the stream and channel locks and any other stream-type specific
+ * lock that need to be acquired during the processing of an
+ * availability notification.
+ */
+typedef void (*lock_cb)(struct lttng_consumer_stream *);
+
+/*
+ * Unlock the stream and channel locks and any other stream-type specific
+ * lock before sleeping until the next availability notification.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef void (*unlock_cb)(struct lttng_consumer_stream *);
+
+/*
+ * Invoked when a subbuffer's metadata version does not match the last
+ * known metadata version.
+ *
+ * Stream and channel locks are acquired during this call.
+ */
+typedef void (*reset_metadata_cb)(struct lttng_consumer_stream *);
+
/*
* Internal representation of the streams, sessiond_key is used to identify
* uniquely a stream.
* file before writing in it (regeneration).
*/
unsigned int reset_metadata_flag:1;
+ struct {
+ /*
+ * Invoked in the order of declaration.
+ * See callback type definitions.
+ */
+ lock_cb lock;
+ on_wake_up_cb on_wake_up;
+ get_next_subbuffer_cb get_next_subbuffer;
+ extract_subbuffer_info_cb extract_subbuffer_info;
+ pre_consume_subbuffer_cb pre_consume_subbuffer;
+ reset_metadata_cb reset_metadata;
+ consume_subbuffer_cb consume_subbuffer;
+ put_next_subbuffer_cb put_next_subbuffer;
+ post_consume_cb post_consume;
+ send_live_beacon_cb send_live_beacon;
+ on_sleep_cb on_sleep;
+ unlock_cb unlock;
+ } read_subbuffer_ops;
};
/*
* Returns the number of bytes read, or negative error value.
*/
ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx);
+ struct lttng_consumer_local_data *ctx,
+ bool locked_by_caller);
/*
* function to call when we receive a new channel, it receives a
* newly allocated channel, depending on the return code of this
struct lttng_consumer_local_data *lttng_consumer_create(
enum lttng_consumer_type type,
ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx),
+ struct lttng_consumer_local_data *ctx,
+ bool locked_by_caller),
int (*recv_channel)(struct lttng_consumer_channel *channel),
int (*recv_stream)(struct lttng_consumer_stream *stream),
int (*update_stream)(uint64_t sessiond_key, uint32_t state));
struct lttng_consumer_local_data *ctx,
struct lttng_consumer_stream *stream,
const struct lttng_buffer_view *buffer,
- unsigned long padding,
- struct ctf_packet_index *index);
+ unsigned long padding);
ssize_t lttng_consumer_on_read_subbuffer_splice(
struct lttng_consumer_local_data *ctx,
struct lttng_consumer_stream *stream, unsigned long len,
- unsigned long padding,
- struct ctf_packet_index *index);
+ unsigned long padding);
int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream *stream);
int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
int sock, struct pollfd *consumer_sockpoll);
ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx);
+ struct lttng_consumer_local_data *ctx,
+ bool locked_by_caller);
int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
void consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
struct lttng_consumer_local_data *ctx, int sock,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "common/buffer-view.h"
-#include <stdint.h>
#define _LGPL_SOURCE
#include <assert.h>
#include <poll.h>
#include <common/index/index.h>
#include <common/consumer/consumer-timer.h>
#include <common/optional.h>
+#include <common/buffer-view.h>
+#include <common/consumer/consumer.h>
+#include <stdint.h>
#include "kernel-consumer.h"
subbuf_addr, 0, padded_len);
read_len = lttng_consumer_on_read_subbuffer_mmap(ctx,
stream, &subbuf_view,
- padded_len - len, NULL);
+ padded_len - len);
/*
* We write the padded len in local tracefiles but the data len
* when using a relay. Display the error but continue processing
do {
health_code_update();
- ret_read = lttng_kconsumer_read_subbuffer(metadata_stream, ctx);
+ ret_read = lttng_consumer_read_subbuffer(metadata_stream, ctx, true);
if (ret_read < 0) {
if (ret_read != -EAGAIN) {
ERR("Kernel snapshot reading metadata subbuffer (ret: %zd)",
health_code_update();
pthread_mutex_lock(&channel->lock);
- new_stream = consumer_allocate_stream(
+ new_stream = consumer_stream_create(
channel,
channel->key,
fd,
consumer_stream_update_channel_attributes(new_stream,
channel);
- switch (channel->output) {
- case CONSUMER_CHANNEL_SPLICE:
- new_stream->output = LTTNG_EVENT_SPLICE;
- ret = utils_create_pipe(new_stream->splice_pipe);
- if (ret < 0) {
- pthread_mutex_unlock(&channel->lock);
- goto error_add_stream_nosignal;
- }
- break;
- case CONSUMER_CHANNEL_MMAP:
- new_stream->output = LTTNG_EVENT_MMAP;
- break;
- default:
- ERR("Stream output unknown %d", channel->output);
- pthread_mutex_unlock(&channel->lock);
- goto error_add_stream_nosignal;
- }
/*
* We've just assigned the channel to the stream so increment the
return ret;
}
-/*
- * Populate index values of a kernel stream. Values are set in big endian order.
- *
- * Return 0 on success or else a negative value.
- */
-static int get_index_values(struct ctf_packet_index *index, int infd)
-{
- int ret;
- uint64_t packet_size, content_size, timestamp_begin, timestamp_end,
- events_discarded, stream_id, stream_instance_id,
- packet_seq_num;
-
- ret = kernctl_get_timestamp_begin(infd, ×tamp_begin);
- if (ret < 0) {
- PERROR("kernctl_get_timestamp_begin");
- goto error;
- }
-
- ret = kernctl_get_timestamp_end(infd, ×tamp_end);
- if (ret < 0) {
- PERROR("kernctl_get_timestamp_end");
- goto error;
- }
-
- ret = kernctl_get_events_discarded(infd, &events_discarded);
- if (ret < 0) {
- PERROR("kernctl_get_events_discarded");
- goto error;
- }
-
- ret = kernctl_get_content_size(infd, &content_size);
- if (ret < 0) {
- PERROR("kernctl_get_content_size");
- goto error;
- }
-
- ret = kernctl_get_packet_size(infd, &packet_size);
- if (ret < 0) {
- PERROR("kernctl_get_packet_size");
- goto error;
- }
-
- ret = kernctl_get_stream_id(infd, &stream_id);
- if (ret < 0) {
- PERROR("kernctl_get_stream_id");
- goto error;
- }
-
- ret = kernctl_get_instance_id(infd, &stream_instance_id);
- if (ret < 0) {
- if (ret == -ENOTTY) {
- /* Command not implemented by lttng-modules. */
- stream_instance_id = -1ULL;
- } else {
- PERROR("kernctl_get_instance_id");
- goto error;
- }
- }
-
- ret = kernctl_get_sequence_number(infd, &packet_seq_num);
- if (ret < 0) {
- if (ret == -ENOTTY) {
- /* Command not implemented by lttng-modules. */
- packet_seq_num = -1ULL;
- ret = 0;
- } else {
- PERROR("kernctl_get_sequence_number");
- goto error;
- }
- }
- index->packet_seq_num = htobe64(index->packet_seq_num);
-
- *index = (typeof(*index)) {
- .offset = index->offset,
- .packet_size = htobe64(packet_size),
- .content_size = htobe64(content_size),
- .timestamp_begin = htobe64(timestamp_begin),
- .timestamp_end = htobe64(timestamp_end),
- .events_discarded = htobe64(events_discarded),
- .stream_id = htobe64(stream_id),
- .stream_instance_id = htobe64(stream_instance_id),
- .packet_seq_num = htobe64(packet_seq_num),
- };
-
-error:
- return ret;
-}
/*
* Sync metadata meaning request them to the session daemon and snapshot to the
* metadata thread can consumer them.
}
static
-int update_stream_stats(struct lttng_consumer_stream *stream)
+int extract_common_subbuffer_info(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuf)
{
int ret;
- uint64_t seq, discarded;
-
- ret = kernctl_get_sequence_number(stream->wait_fd, &seq);
- if (ret < 0) {
- if (ret == -ENOTTY) {
- /* Command not implemented by lttng-modules. */
- seq = -1ULL;
- stream->sequence_number_unavailable = true;
- } else {
- PERROR("kernctl_get_sequence_number");
- goto end;
- }
- }
- /*
- * Start the sequence when we extract the first packet in case we don't
- * start at 0 (for example if a consumer is not connected to the
- * session immediately after the beginning).
- */
- if (stream->last_sequence_number == -1ULL) {
- stream->last_sequence_number = seq;
- } else if (seq > stream->last_sequence_number) {
- stream->chan->lost_packets += seq -
- stream->last_sequence_number - 1;
- } else {
- /* seq <= last_sequence_number */
- ERR("Sequence number inconsistent : prev = %" PRIu64
- ", current = %" PRIu64,
- stream->last_sequence_number, seq);
- ret = -1;
+ ret = kernctl_get_subbuf_size(
+ stream->wait_fd, &subbuf->info.data.subbuf_size);
+ if (ret) {
goto end;
}
- stream->last_sequence_number = seq;
- ret = kernctl_get_events_discarded(stream->wait_fd, &discarded);
- if (ret < 0) {
- PERROR("kernctl_get_events_discarded");
+ ret = kernctl_get_padded_subbuf_size(
+ stream->wait_fd, &subbuf->info.data.padded_subbuf_size);
+ if (ret) {
goto end;
}
- if (discarded < stream->last_discarded_events) {
- /*
- * Overflow has occurred. We assume only one wrap-around
- * has occurred.
- */
- stream->chan->discarded_events += (1ULL << (CAA_BITS_PER_LONG - 1)) -
- stream->last_discarded_events + discarded;
- } else {
- stream->chan->discarded_events += discarded -
- stream->last_discarded_events;
- }
- stream->last_discarded_events = discarded;
- ret = 0;
end:
return ret;
}
-/*
- * Check if the local version of the metadata stream matches with the version
- * of the metadata stream in the kernel. If it was updated, set the reset flag
- * on the stream.
- */
static
-int metadata_stream_check_version(int infd, struct lttng_consumer_stream *stream)
+int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuf)
{
int ret;
- uint64_t cur_version;
- ret = kernctl_get_metadata_version(infd, &cur_version);
- if (ret < 0) {
- if (ret == -ENOTTY) {
- /*
- * LTTng-modules does not implement this
- * command.
- */
- ret = 0;
- goto end;
- }
- ERR("Failed to get the metadata version");
+ ret = extract_common_subbuffer_info(stream, subbuf);
+ if (ret) {
goto end;
}
- if (stream->metadata_version == cur_version) {
- ret = 0;
+ ret = kernctl_get_metadata_version(
+ stream->wait_fd, &subbuf->info.metadata.version);
+ if (ret) {
goto end;
}
- DBG("New metadata version detected");
- stream->metadata_version = cur_version;
- stream->reset_metadata_flag = 1;
- ret = 0;
-
end:
return ret;
}
-/*
- * Consume data on a file descriptor and write it on a trace file.
- * The stream and channel locks must be held by the caller.
- */
-ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx)
+static
+int extract_data_subbuffer_info(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuf)
{
- unsigned long len, subbuf_size, padding;
- int err, write_index = 1;
- ssize_t ret = 0;
- int infd = stream->wait_fd;
- struct ctf_packet_index index = {};
- bool in_error_state = false;
+ int ret;
- DBG("In read_subbuffer (infd : %d)", infd);
+ ret = extract_common_subbuffer_info(stream, subbuf);
+ if (ret) {
+ goto end;
+ }
+ ret = kernctl_get_packet_size(
+ stream->wait_fd, &subbuf->info.data.packet_size);
+ if (ret < 0) {
+ PERROR("Failed to get sub-buffer packet size");
+ goto end;
+ }
- /* Get the next subbuffer */
- err = kernctl_get_next_subbuf(infd);
- if (err != 0) {
- /*
- * This is a debug message even for single-threaded consumer,
- * because poll() have more relaxed criterions than get subbuf,
- * so get_subbuf may fail for short race windows where poll()
- * would issue wakeups.
- */
- DBG("Reserving sub buffer failed (everything is normal, "
- "it is due to concurrency)");
- ret = err;
- goto error;
+ ret = kernctl_get_content_size(
+ stream->wait_fd, &subbuf->info.data.content_size);
+ if (ret < 0) {
+ PERROR("Failed to get sub-buffer content size");
+ goto end;
}
- /* Get the full subbuffer size including padding */
- err = kernctl_get_padded_subbuf_size(infd, &len);
- if (err != 0) {
- PERROR("Getting sub-buffer len failed.");
- err = kernctl_put_subbuf(infd);
- if (err != 0) {
- if (err == -EFAULT) {
- PERROR("Error in unreserving sub buffer\n");
- } else if (err == -EIO) {
- /* Should never happen with newer LTTng versions */
- PERROR("Reader has been pushed by the writer, last sub-buffer corrupted.");
- }
- ret = err;
- goto error;
- }
- ret = err;
- goto error;
+ ret = kernctl_get_timestamp_begin(
+ stream->wait_fd, &subbuf->info.data.timestamp_begin);
+ if (ret < 0) {
+ PERROR("Failed to get sub-buffer begin timestamp");
+ goto end;
}
- if (!stream->metadata_flag) {
- ret = get_index_values(&index, infd);
- if (ret < 0) {
- err = kernctl_put_subbuf(infd);
- if (err != 0) {
- if (err == -EFAULT) {
- PERROR("Error in unreserving sub buffer\n");
- } else if (err == -EIO) {
- /* Should never happen with newer LTTng versions */
- PERROR("Reader has been pushed by the writer, last sub-buffer corrupted.");
- }
- ret = err;
- goto error;
- }
- goto error;
- }
- ret = update_stream_stats(stream);
- if (ret < 0) {
- err = kernctl_put_subbuf(infd);
- if (err != 0) {
- if (err == -EFAULT) {
- PERROR("Error in unreserving sub buffer\n");
- } else if (err == -EIO) {
- /* Should never happen with newer LTTng versions */
- PERROR("Reader has been pushed by the writer, last sub-buffer corrupted.");
- }
- ret = err;
- goto error;
- }
- goto error;
+ ret = kernctl_get_timestamp_end(
+ stream->wait_fd, &subbuf->info.data.timestamp_end);
+ if (ret < 0) {
+ PERROR("Failed to get sub-buffer end timestamp");
+ goto end;
+ }
+
+ ret = kernctl_get_events_discarded(
+ stream->wait_fd, &subbuf->info.data.events_discarded);
+ if (ret) {
+ PERROR("Failed to get sub-buffer events discarded count");
+ goto end;
+ }
+
+ ret = kernctl_get_sequence_number(stream->wait_fd,
+ &subbuf->info.data.sequence_number.value);
+ if (ret) {
+ /* May not be supported by older LTTng-modules. */
+ if (ret != -ENOTTY) {
+ PERROR("Failed to get sub-buffer sequence number");
+ goto end;
}
} else {
- write_index = 0;
- ret = metadata_stream_check_version(infd, stream);
- if (ret < 0) {
- err = kernctl_put_subbuf(infd);
- if (err != 0) {
- if (err == -EFAULT) {
- PERROR("Error in unreserving sub buffer\n");
- } else if (err == -EIO) {
- /* Should never happen with newer LTTng versions */
- PERROR("Reader has been pushed by the writer, last sub-buffer corrupted.");
- }
- ret = err;
- goto error;
- }
- goto error;
- }
+ subbuf->info.data.sequence_number.is_set = true;
}
- switch (stream->chan->output) {
- case CONSUMER_CHANNEL_SPLICE:
- /*
- * XXX: The lttng-modules splice "actor" does not handle copying
- * partial pages hence only using the subbuffer size without the
- * padding makes the splice fail.
- */
- subbuf_size = len;
- padding = 0;
+ ret = kernctl_get_stream_id(
+ stream->wait_fd, &subbuf->info.data.stream_id);
+ if (ret < 0) {
+ PERROR("Failed to get stream id");
+ goto end;
+ }
- /* splice the subbuffer to the tracefile */
- ret = lttng_consumer_on_read_subbuffer_splice(ctx, stream, subbuf_size,
- padding, &index);
- /*
- * XXX: Splice does not support network streaming so the return value
- * is simply checked against subbuf_size and not like the mmap() op.
- */
- if (ret != subbuf_size) {
- /*
- * display the error but continue processing to try
- * to release the subbuffer
- */
- ERR("Error splicing to tracefile (ret: %zd != len: %lu)",
- ret, subbuf_size);
- write_index = 0;
- }
- break;
- case CONSUMER_CHANNEL_MMAP:
- {
- const char *subbuf_addr;
- struct lttng_buffer_view subbuf_view;
-
- /* Get subbuffer size without padding */
- err = kernctl_get_subbuf_size(infd, &subbuf_size);
- if (err != 0) {
- PERROR("Getting sub-buffer len failed.");
- err = kernctl_put_subbuf(infd);
- if (err != 0) {
- if (err == -EFAULT) {
- PERROR("Error in unreserving sub buffer\n");
- } else if (err == -EIO) {
- /* Should never happen with newer LTTng versions */
- PERROR("Reader has been pushed by the writer, last sub-buffer corrupted.");
- }
- ret = err;
- goto error;
- }
- ret = err;
- goto error;
+ ret = kernctl_get_instance_id(stream->wait_fd,
+ &subbuf->info.data.stream_instance_id.value);
+ if (ret) {
+ /* May not be supported by older LTTng-modules. */
+ if (ret != -ENOTTY) {
+ PERROR("Failed to get stream instance id");
+ goto end;
}
+ } else {
+ subbuf->info.data.stream_instance_id.is_set = true;
+ }
+end:
+ return ret;
+}
- ret = get_current_subbuf_addr(stream, &subbuf_addr);
- if (ret) {
- goto error_put_subbuf;
- }
+static
+int get_subbuffer_common(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuffer)
+{
+ int ret;
- /* Make sure the tracer is not gone mad on us! */
- assert(len >= subbuf_size);
+ ret = kernctl_get_next_subbuf(stream->wait_fd);
+ if (ret) {
+ goto end;
+ }
- padding = len - subbuf_size;
+ ret = stream->read_subbuffer_ops.extract_subbuffer_info(
+ stream, subbuffer);
+end:
+ return ret;
+}
- subbuf_view = lttng_buffer_view_init(subbuf_addr, 0, len);
+static
+int get_next_subbuffer_splice(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuffer)
+{
+ int ret;
- /* write the subbuffer to the tracefile */
- ret = lttng_consumer_on_read_subbuffer_mmap(
- ctx, stream, &subbuf_view, padding, &index);
- /*
- * The mmap operation should write subbuf_size amount of data
- * when network streaming or the full padding (len) size when we
- * are _not_ streaming.
- */
- if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) ||
- (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) {
- /*
- * Display the error but continue processing to try to release the
- * subbuffer. This is a DBG statement since this is possible to
- * happen without being a critical error.
- */
- DBG("Error writing to tracefile "
- "(ret: %zd != len: %lu != subbuf_size: %lu)",
- ret, len, subbuf_size);
- write_index = 0;
- }
- break;
- }
- default:
- ERR("Unknown output method");
- ret = -EPERM;
+ ret = get_subbuffer_common(stream, subbuffer);
+ if (ret) {
+ goto end;
}
-error_put_subbuf:
- err = kernctl_put_next_subbuf(infd);
- if (err != 0) {
- if (err == -EFAULT) {
- PERROR("Error in unreserving sub buffer\n");
- } else if (err == -EIO) {
- /* Should never happen with newer LTTng versions */
- PERROR("Reader has been pushed by the writer, last sub-buffer corrupted.");
- }
- ret = err;
- goto error;
- } else if (in_error_state) {
- goto error;
+
+ subbuffer->buffer.fd = stream->wait_fd;
+end:
+ return ret;
+}
+
+static
+int get_next_subbuffer_mmap(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuffer)
+{
+ int ret;
+ const char *addr;
+
+ ret = get_subbuffer_common(stream, subbuffer);
+ if (ret) {
+ goto end;
}
- /* Write index if needed. */
- if (!write_index) {
+ ret = get_current_subbuf_addr(stream, &addr);
+ if (ret) {
goto end;
}
- if (stream->chan->live_timer_interval && !stream->metadata_flag) {
- /*
- * In live, block until all the metadata is sent.
- */
- pthread_mutex_lock(&stream->metadata_timer_lock);
- assert(!stream->missed_metadata_flush);
- stream->waiting_on_metadata = true;
- pthread_mutex_unlock(&stream->metadata_timer_lock);
-
- err = consumer_stream_sync_metadata(ctx, stream->session_id);
-
- pthread_mutex_lock(&stream->metadata_timer_lock);
- stream->waiting_on_metadata = false;
- if (stream->missed_metadata_flush) {
- stream->missed_metadata_flush = false;
- pthread_mutex_unlock(&stream->metadata_timer_lock);
- (void) consumer_flush_kernel_index(stream);
- } else {
- pthread_mutex_unlock(&stream->metadata_timer_lock);
- }
- if (err < 0) {
- goto error;
+ subbuffer->buffer.buffer = lttng_buffer_view_init(
+ addr, 0, subbuffer->info.data.padded_subbuf_size);
+end:
+ return ret;
+}
+
+static
+int put_next_subbuffer(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuffer)
+{
+ const int ret = kernctl_put_next_subbuf(stream->wait_fd);
+
+ if (ret) {
+ if (ret == -EFAULT) {
+ PERROR("Error in unreserving sub buffer");
+ } else if (ret == -EIO) {
+ /* Should never happen with newer LTTng versions */
+ PERROR("Reader has been pushed by the writer, last sub-buffer corrupted");
}
}
- err = consumer_stream_write_index(stream, &index);
- if (err < 0) {
- goto error;
+ return ret;
+}
+
+static void lttng_kconsumer_set_stream_ops(
+ struct lttng_consumer_stream *stream)
+{
+ if (stream->chan->output == CONSUMER_CHANNEL_MMAP) {
+ stream->read_subbuffer_ops.get_next_subbuffer =
+ get_next_subbuffer_mmap;
+ } else {
+ stream->read_subbuffer_ops.get_next_subbuffer =
+ get_next_subbuffer_splice;
}
-end:
-error:
- return ret;
+ if (stream->metadata_flag) {
+ stream->read_subbuffer_ops.extract_subbuffer_info =
+ extract_metadata_subbuffer_info;
+ } else {
+ stream->read_subbuffer_ops.extract_subbuffer_info =
+ extract_data_subbuffer_info;
+ if (stream->chan->is_live) {
+ stream->read_subbuffer_ops.send_live_beacon =
+ consumer_flush_kernel_index;
+ }
+ }
+
+ stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer;
}
int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
}
}
+ lttng_kconsumer_set_stream_ops(stream);
+
/* we return 0 to let the library handle the FD internally */
return 0;
unsigned long *pos);
int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
int sock, struct pollfd *consumer_sockpoll);
-ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx);
int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream);
int lttng_kconsumer_data_pending(struct lttng_consumer_stream *stream);
int lttng_kconsumer_sync_metadata(struct lttng_consumer_stream *metadata);
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include <stdint.h>
#define _LGPL_SOURCE
#include <assert.h>
#include <lttng/ust-ctl.h>
#include <urcu/list.h>
#include <signal.h>
#include <stdbool.h>
+#include <stdint.h>
#include <bin/lttng-consumerd/health-consumerd.h>
#include <common/common.h>
#include <common/consumer/consumer-timer.h>
#include <common/utils.h>
#include <common/index/index.h>
+#include <common/consumer/consumer.h>
#include "ust-consumer.h"
assert(channel);
assert(ctx);
- stream = consumer_allocate_stream(
+ stream = consumer_stream_create(
channel,
channel->key,
key,
do {
health_code_update();
- ret = lttng_consumer_read_subbuffer(metadata_stream, ctx);
+ ret = lttng_consumer_read_subbuffer(metadata_stream, ctx, true);
if (ret < 0) {
goto error_stream;
}
subbuf_view = lttng_buffer_view_init(
subbuf_addr, 0, padded_len);
read_len = lttng_consumer_on_read_subbuffer_mmap(ctx,
- stream, &subbuf_view, padded_len - len,
- NULL);
+ stream, &subbuf_view, padded_len - len);
if (use_relayd) {
if (read_len != len) {
ret = -EPERM;
return ustctl_stream_close_wakeup_fd(stream->ustream);
}
-/*
- * Populate index values of a UST stream. Values are set in big endian order.
- *
- * Return 0 on success or else a negative value.
- */
-static int get_index_values(struct ctf_packet_index *index,
- struct ustctl_consumer_stream *ustream)
-{
- int ret;
- uint64_t packet_size, content_size, timestamp_begin, timestamp_end,
- events_discarded, stream_id, stream_instance_id,
- packet_seq_num;
-
- ret = ustctl_get_timestamp_begin(ustream, ×tamp_begin);
- if (ret < 0) {
- PERROR("ustctl_get_timestamp_begin");
- goto error;
- }
-
- ret = ustctl_get_timestamp_end(ustream, ×tamp_end);
- if (ret < 0) {
- PERROR("ustctl_get_timestamp_end");
- goto error;
- }
-
- ret = ustctl_get_events_discarded(ustream, &events_discarded);
- if (ret < 0) {
- PERROR("ustctl_get_events_discarded");
- goto error;
- }
-
- ret = ustctl_get_content_size(ustream, &content_size);
- if (ret < 0) {
- PERROR("ustctl_get_content_size");
- goto error;
- }
-
- ret = ustctl_get_packet_size(ustream, &packet_size);
- if (ret < 0) {
- PERROR("ustctl_get_packet_size");
- goto error;
- }
-
- ret = ustctl_get_stream_id(ustream, &stream_id);
- if (ret < 0) {
- PERROR("ustctl_get_stream_id");
- goto error;
- }
-
- ret = ustctl_get_instance_id(ustream, &stream_instance_id);
- if (ret < 0) {
- PERROR("ustctl_get_instance_id");
- goto error;
- }
-
- ret = ustctl_get_sequence_number(ustream, &packet_seq_num);
- if (ret < 0) {
- PERROR("ustctl_get_sequence_number");
- goto error;
- }
-
- *index = (typeof(*index)) {
- .offset = index->offset,
- .packet_size = htobe64(packet_size),
- .content_size = htobe64(content_size),
- .timestamp_begin = htobe64(timestamp_begin),
- .timestamp_end = htobe64(timestamp_end),
- .events_discarded = htobe64(events_discarded),
- .stream_id = htobe64(stream_id),
- .stream_instance_id = htobe64(stream_instance_id),
- .packet_seq_num = htobe64(packet_seq_num),
- };
-
-error:
- return ret;
-}
-
static
-void metadata_stream_reset_cache(struct lttng_consumer_stream *stream,
- struct consumer_metadata_cache *cache)
+void metadata_stream_reset_cache(struct lttng_consumer_stream *stream)
{
- DBG("Metadata stream update to version %" PRIu64,
- cache->version);
+ DBG("Reset metadata cache of session %" PRIu64,
+ stream->chan->session_id);
stream->ust_metadata_pushed = 0;
- stream->metadata_version = cache->version;
+ stream->metadata_version = stream->chan->metadata_cache->version;
stream->reset_metadata_flag = 1;
}
-/*
- * Check if the version of the metadata stream and metadata cache match.
- * If the cache got updated, reset the metadata stream.
- * The stream lock and metadata cache lock MUST be held.
- * Return 0 on success, a negative value on error.
- */
-static
-int metadata_stream_check_version(struct lttng_consumer_stream *stream)
-{
- int ret = 0;
- struct consumer_metadata_cache *cache = stream->chan->metadata_cache;
-
- if (cache->version == stream->metadata_version) {
- goto end;
- }
- metadata_stream_reset_cache(stream, cache);
-
-end:
- return ret;
-}
-
/*
* Write up to one packet from the metadata cache to the channel.
*
int ret;
pthread_mutex_lock(&stream->chan->metadata_cache->lock);
- ret = metadata_stream_check_version(stream);
- if (ret < 0) {
- goto end;
- }
if (stream->chan->metadata_cache->max_offset
== stream->ust_metadata_pushed) {
ret = 0;
return ret;
}
-static
-int update_stream_stats(struct lttng_consumer_stream *stream)
+static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream *stream)
{
- int ret;
- uint64_t seq, discarded;
+ int ret = 0;
- ret = ustctl_get_sequence_number(stream->ustream, &seq);
- if (ret < 0) {
- PERROR("ustctl_get_sequence_number");
- goto end;
- }
/*
- * Start the sequence when we extract the first packet in case we don't
- * start at 0 (for example if a consumer is not connected to the
- * session immediately after the beginning).
+ * We can consume the 1 byte written into the wait_fd by
+ * UST. Don't trigger error if we cannot read this one byte
+ * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK.
+ *
+ * This is only done when the stream is monitored by a thread,
+ * before the flush is done after a hangup and if the stream
+ * is not flagged with data since there might be nothing to
+ * consume in the wait fd but still have data available
+ * flagged by the consumer wake up pipe.
*/
- if (stream->last_sequence_number == -1ULL) {
- stream->last_sequence_number = seq;
- } else if (seq > stream->last_sequence_number) {
- stream->chan->lost_packets += seq -
- stream->last_sequence_number - 1;
- } else {
- /* seq <= last_sequence_number */
- ERR("Sequence number inconsistent : prev = %" PRIu64
- ", current = %" PRIu64,
- stream->last_sequence_number, seq);
- ret = -1;
- goto end;
+ if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) {
+ char dummy;
+ ssize_t readlen;
+
+ readlen = lttng_read(stream->wait_fd, &dummy, 1);
+ if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
+ ret = readlen;
+ }
}
- stream->last_sequence_number = seq;
- ret = ustctl_get_events_discarded(stream->ustream, &discarded);
- if (ret < 0) {
- PERROR("kernctl_get_events_discarded");
+ return ret;
+}
+
+static int extract_common_subbuffer_info(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuf)
+{
+ int ret;
+
+ ret = ustctl_get_subbuf_size(
+ stream->ustream, &subbuf->info.data.subbuf_size);
+ if (ret) {
goto end;
}
- if (discarded < stream->last_discarded_events) {
- /*
- * Overflow has occurred. We assume only one wrap-around
- * has occurred.
- */
- stream->chan->discarded_events +=
- (1ULL << (CAA_BITS_PER_LONG - 1)) -
- stream->last_discarded_events + discarded;
- } else {
- stream->chan->discarded_events += discarded -
- stream->last_discarded_events;
+
+ ret = ustctl_get_padded_subbuf_size(
+ stream->ustream, &subbuf->info.data.padded_subbuf_size);
+ if (ret) {
+ goto end;
}
- stream->last_discarded_events = discarded;
- ret = 0;
end:
return ret;
}
-/*
- * Read subbuffer from the given stream.
- *
- * Stream and channel locks MUST be acquired by the caller.
- *
- * Return 0 on success else a negative value.
- */
-int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx)
+static int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuf)
{
- unsigned long len, subbuf_size, padding;
- int err, write_index = 1;
- long ret = 0;
- struct ustctl_consumer_stream *ustream;
- struct ctf_packet_index index;
- const char *subbuf_addr;
- struct lttng_buffer_view subbuf_view;
+ int ret;
- assert(stream);
- assert(stream->ustream);
- assert(ctx);
+ ret = extract_common_subbuffer_info(stream, subbuf);
+ if (ret) {
+ goto end;
+ }
- DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd,
- stream->name);
+ subbuf->info.metadata.version = stream->chan->metadata_cache->version;
- /* Ease our life for what's next. */
- ustream = stream->ustream;
+end:
+ return ret;
+}
- /*
- * We can consume the 1 byte written into the wait_fd by UST. Don't trigger
- * error if we cannot read this one byte (read returns 0), or if the error
- * is EAGAIN or EWOULDBLOCK.
- *
- * This is only done when the stream is monitored by a thread, before the
- * flush is done after a hangup and if the stream is not flagged with data
- * since there might be nothing to consume in the wait fd but still have
- * data available flagged by the consumer wake up pipe.
- */
- if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) {
- char dummy;
- ssize_t readlen;
+static int extract_data_subbuffer_info(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuf)
+{
+ int ret;
- readlen = lttng_read(stream->wait_fd, &dummy, 1);
- if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
- ret = readlen;
- goto error;
- }
+ ret = extract_common_subbuffer_info(stream, subbuf);
+ if (ret) {
+ goto end;
}
-retry:
- /* Get the next subbuffer */
- err = ustctl_get_next_subbuf(ustream);
- if (err != 0) {
- /*
- * Populate metadata info if the existing info has
- * already been read.
- */
- if (stream->metadata_flag) {
- ret = commit_one_metadata_packet(stream);
- if (ret <= 0) {
- goto error;
- }
- goto retry;
- }
+ ret = ustctl_get_packet_size(
+ stream->ustream, &subbuf->info.data.packet_size);
+ if (ret < 0) {
+ PERROR("Failed to get sub-buffer packet size");
+ goto end;
+ }
- ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */
- /*
- * This is a debug message even for single-threaded consumer,
- * because poll() have more relaxed criterions than get subbuf,
- * so get_subbuf may fail for short race windows where poll()
- * would issue wakeups.
- */
- DBG("Reserving sub buffer failed (everything is normal, "
- "it is due to concurrency) [ret: %d]", err);
- goto error;
+ ret = ustctl_get_content_size(
+ stream->ustream, &subbuf->info.data.content_size);
+ if (ret < 0) {
+ PERROR("Failed to get sub-buffer content size");
+ goto end;
}
- assert(stream->chan->output == CONSUMER_CHANNEL_MMAP);
- if (!stream->metadata_flag) {
- index.offset = htobe64(stream->out_fd_offset);
- ret = get_index_values(&index, ustream);
- if (ret < 0) {
- err = ustctl_put_subbuf(ustream);
- assert(err == 0);
- goto error;
- }
+ ret = ustctl_get_timestamp_begin(
+ stream->ustream, &subbuf->info.data.timestamp_begin);
+ if (ret < 0) {
+ PERROR("Failed to get sub-buffer begin timestamp");
+ goto end;
+ }
- /* Update the stream's sequence and discarded events count. */
- ret = update_stream_stats(stream);
- if (ret < 0) {
- PERROR("kernctl_get_events_discarded");
- err = ustctl_put_subbuf(ustream);
- assert(err == 0);
- goto error;
+ ret = ustctl_get_timestamp_end(
+ stream->ustream, &subbuf->info.data.timestamp_end);
+ if (ret < 0) {
+ PERROR("Failed to get sub-buffer end timestamp");
+ goto end;
+ }
+
+ ret = ustctl_get_events_discarded(
+ stream->ustream, &subbuf->info.data.events_discarded);
+ if (ret) {
+ PERROR("Failed to get sub-buffer events discarded count");
+ goto end;
+ }
+
+ ret = ustctl_get_sequence_number(stream->ustream,
+ &subbuf->info.data.sequence_number.value);
+ if (ret) {
+ /* May not be supported by older LTTng-modules. */
+ if (ret != -ENOTTY) {
+ PERROR("Failed to get sub-buffer sequence number");
+ goto end;
}
} else {
- write_index = 0;
+ subbuf->info.data.sequence_number.is_set = true;
}
- /* Get the full padded subbuffer size */
- err = ustctl_get_padded_subbuf_size(ustream, &len);
- assert(err == 0);
+ ret = ustctl_get_stream_id(
+ stream->ustream, &subbuf->info.data.stream_id);
+ if (ret < 0) {
+ PERROR("Failed to get stream id");
+ goto end;
+ }
- /* Get subbuffer data size (without padding) */
- err = ustctl_get_subbuf_size(ustream, &subbuf_size);
- assert(err == 0);
+ ret = ustctl_get_instance_id(stream->ustream,
+ &subbuf->info.data.stream_instance_id.value);
+ if (ret) {
+ /* May not be supported by older LTTng-modules. */
+ if (ret != -ENOTTY) {
+ PERROR("Failed to get stream instance id");
+ goto end;
+ }
+ } else {
+ subbuf->info.data.stream_instance_id.is_set = true;
+ }
+end:
+ return ret;
+}
- /* Make sure we don't get a subbuffer size bigger than the padded */
- assert(len >= subbuf_size);
+static int get_next_subbuffer_common(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuffer)
+{
+ int ret;
+ const char *addr;
- padding = len - subbuf_size;
+ ret = stream->read_subbuffer_ops.extract_subbuffer_info(
+ stream, subbuffer);
+ if (ret) {
+ goto end;
+ }
- ret = get_current_subbuf_addr(stream, &subbuf_addr);
+ ret = get_current_subbuf_addr(stream, &addr);
if (ret) {
- write_index = 0;
- goto error_put_subbuf;
+ goto end;
}
- subbuf_view = lttng_buffer_view_init(subbuf_addr, 0, len);
+ subbuffer->buffer.buffer = lttng_buffer_view_init(
+ addr, 0, subbuffer->info.data.padded_subbuf_size);
+ assert(subbuffer->buffer.buffer.data != NULL);
+end:
+ return ret;
+}
- /* write the subbuffer to the tracefile */
- ret = lttng_consumer_on_read_subbuffer_mmap(
- ctx, stream, &subbuf_view, padding, &index);
- /*
- * The mmap operation should write subbuf_size amount of data when
- * network streaming or the full padding (len) size when we are _not_
- * streaming.
- */
- if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) ||
- (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) {
- /*
- * Display the error but continue processing to try to release the
- * subbuffer. This is a DBG statement since any unexpected kill or
- * signal, the application gets unregistered, relayd gets closed or
- * anything that affects the buffer lifetime will trigger this error.
- * So, for the sake of the user, don't print this error since it can
- * happen and it is OK with the code flow.
- */
- DBG("Error writing to tracefile "
- "(ret: %ld != len: %lu != subbuf_size: %lu)",
- ret, len, subbuf_size);
- write_index = 0;
- }
-error_put_subbuf:
- err = ustctl_put_next_subbuf(ustream);
- assert(err == 0);
+static int get_next_subbuffer(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuffer)
+{
+ int ret;
- /*
- * This will consumer the byte on the wait_fd if and only if there is not
- * next subbuffer to be acquired.
- */
- if (!stream->metadata_flag) {
- ret = notify_if_more_data(stream, ctx);
- if (ret < 0) {
- goto error;
- }
+ ret = ustctl_get_next_subbuf(stream->ustream);
+ if (ret) {
+ goto end;
}
- /* Write index if needed. */
- if (!write_index) {
+ ret = get_next_subbuffer_common(stream, subbuffer);
+ if (ret) {
goto end;
}
+end:
+ return ret;
+}
- if (stream->chan->live_timer_interval && !stream->metadata_flag) {
- /*
- * In live, block until all the metadata is sent.
- */
- pthread_mutex_lock(&stream->metadata_timer_lock);
- assert(!stream->missed_metadata_flush);
- stream->waiting_on_metadata = true;
- pthread_mutex_unlock(&stream->metadata_timer_lock);
-
- err = consumer_stream_sync_metadata(ctx, stream->session_id);
-
- pthread_mutex_lock(&stream->metadata_timer_lock);
- stream->waiting_on_metadata = false;
- if (stream->missed_metadata_flush) {
- stream->missed_metadata_flush = false;
- pthread_mutex_unlock(&stream->metadata_timer_lock);
- (void) consumer_flush_ust_index(stream);
- } else {
- pthread_mutex_unlock(&stream->metadata_timer_lock);
+static int get_next_subbuffer_metadata(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuffer)
+{
+ int ret;
+
+ ret = ustctl_get_next_subbuf(stream->ustream);
+ if (ret) {
+ ret = commit_one_metadata_packet(stream);
+ if (ret < 0) {
+ goto end;
+ } else if (ret == 0) {
+ /* Not an error, the cache is empty. */
+ ret = -ENODATA;
+ goto end;
}
- if (err < 0) {
- goto error;
+ ret = ustctl_get_next_subbuf(stream->ustream);
+ if (ret) {
+ goto end;
}
}
- assert(!stream->metadata_flag);
- err = consumer_stream_write_index(stream, &index);
- if (err < 0) {
- goto error;
+ ret = get_next_subbuffer_common(stream, subbuffer);
+ if (ret) {
+ goto end;
}
-
end:
-error:
return ret;
}
+static int put_next_subbuffer(struct lttng_consumer_stream *stream,
+ struct stream_subbuffer *subbuffer)
+{
+ const int ret = ustctl_put_next_subbuf(stream->ustream);
+
+ assert(ret == 0);
+ return ret;
+}
+
+static int signal_metadata(struct lttng_consumer_stream *stream,
+ struct lttng_consumer_local_data *ctx)
+{
+ return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0;
+}
+
+static void lttng_ustconsumer_set_stream_ops(
+ struct lttng_consumer_stream *stream)
+{
+ stream->read_subbuffer_ops.on_wake_up = consumer_stream_ust_on_wake_up;
+ if (stream->metadata_flag) {
+ stream->read_subbuffer_ops.get_next_subbuffer =
+ get_next_subbuffer_metadata;
+ stream->read_subbuffer_ops.extract_subbuffer_info =
+ extract_metadata_subbuffer_info;
+ stream->read_subbuffer_ops.reset_metadata =
+ metadata_stream_reset_cache;
+ stream->read_subbuffer_ops.on_sleep = signal_metadata;
+ } else {
+ stream->read_subbuffer_ops.get_next_subbuffer =
+ get_next_subbuffer;
+ stream->read_subbuffer_ops.extract_subbuffer_info =
+ extract_data_subbuffer_info;
+ stream->read_subbuffer_ops.on_sleep = notify_if_more_data;
+ if (stream->chan->is_live) {
+ stream->read_subbuffer_ops.send_live_beacon =
+ consumer_flush_ust_index;
+ }
+ }
+
+ stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer;
+}
+
/*
* Called when a stream is created.
*
goto error;
}
}
+
+ lttng_ustconsumer_set_stream_ops(stream);
ret = 0;
error:
projects / lttng-tools.git / commitdiff
