2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2012 - David Goulet <dgoulet@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <sys/socket.h>
28 #include <sys/types.h>
33 #include <bin/lttng-consumerd/health-consumerd.h>
34 #include <common/common.h>
35 #include <common/utils.h>
36 #include <common/time.h>
37 #include <common/compat/poll.h>
38 #include <common/compat/endian.h>
39 #include <common/index/index.h>
40 #include <common/kernel-ctl/kernel-ctl.h>
41 #include <common/sessiond-comm/relayd.h>
42 #include <common/sessiond-comm/sessiond-comm.h>
43 #include <common/kernel-consumer/kernel-consumer.h>
44 #include <common/relayd/relayd.h>
45 #include <common/ust-consumer/ust-consumer.h>
46 #include <common/consumer/consumer-timer.h>
47 #include <common/consumer/consumer.h>
48 #include <common/consumer/consumer-stream.h>
49 #include <common/consumer/consumer-testpoint.h>
50 #include <common/align.h>
51 #include <common/consumer/consumer-metadata-cache.h>
52 #include <common/trace-chunk.h>
53 #include <common/trace-chunk-registry.h>
54 #include <common/string-utils/format.h>
55 #include <common/dynamic-array.h>
57 struct lttng_consumer_global_data consumer_data
= {
60 .type
= LTTNG_CONSUMER_UNKNOWN
,
63 enum consumer_channel_action
{
66 CONSUMER_CHANNEL_QUIT
,
69 struct consumer_channel_msg
{
70 enum consumer_channel_action action
;
71 struct lttng_consumer_channel
*chan
; /* add */
72 uint64_t key
; /* del */
75 /* Flag used to temporarily pause data consumption from testpoints. */
76 int data_consumption_paused
;
79 * Flag to inform the polling thread to quit when all fd hung up. Updated by
80 * the consumer_thread_receive_fds when it notices that all fds has hung up.
81 * Also updated by the signal handler (consumer_should_exit()). Read by the
87 * Global hash table containing respectively metadata and data streams. The
88 * stream element in this ht should only be updated by the metadata poll thread
89 * for the metadata and the data poll thread for the data.
91 static struct lttng_ht
*metadata_ht
;
92 static struct lttng_ht
*data_ht
;
95 * Notify a thread lttng pipe to poll back again. This usually means that some
96 * global state has changed so we just send back the thread in a poll wait
99 static void notify_thread_lttng_pipe(struct lttng_pipe
*pipe
)
101 struct lttng_consumer_stream
*null_stream
= NULL
;
105 (void) lttng_pipe_write(pipe
, &null_stream
, sizeof(null_stream
));
108 static void notify_health_quit_pipe(int *pipe
)
112 ret
= lttng_write(pipe
[1], "4", 1);
114 PERROR("write consumer health quit");
118 static void notify_channel_pipe(struct lttng_consumer_local_data
*ctx
,
119 struct lttng_consumer_channel
*chan
,
121 enum consumer_channel_action action
)
123 struct consumer_channel_msg msg
;
126 memset(&msg
, 0, sizeof(msg
));
131 ret
= lttng_write(ctx
->consumer_channel_pipe
[1], &msg
, sizeof(msg
));
132 if (ret
< sizeof(msg
)) {
133 PERROR("notify_channel_pipe write error");
137 void notify_thread_del_channel(struct lttng_consumer_local_data
*ctx
,
140 notify_channel_pipe(ctx
, NULL
, key
, CONSUMER_CHANNEL_DEL
);
143 static int read_channel_pipe(struct lttng_consumer_local_data
*ctx
,
144 struct lttng_consumer_channel
**chan
,
146 enum consumer_channel_action
*action
)
148 struct consumer_channel_msg msg
;
151 ret
= lttng_read(ctx
->consumer_channel_pipe
[0], &msg
, sizeof(msg
));
152 if (ret
< sizeof(msg
)) {
156 *action
= msg
.action
;
164 * Cleanup the stream list of a channel. Those streams are not yet globally
167 static void clean_channel_stream_list(struct lttng_consumer_channel
*channel
)
169 struct lttng_consumer_stream
*stream
, *stmp
;
173 /* Delete streams that might have been left in the stream list. */
174 cds_list_for_each_entry_safe(stream
, stmp
, &channel
->streams
.head
,
176 cds_list_del(&stream
->send_node
);
178 * Once a stream is added to this list, the buffers were created so we
179 * have a guarantee that this call will succeed. Setting the monitor
180 * mode to 0 so we don't lock nor try to delete the stream from the
184 consumer_stream_destroy(stream
, NULL
);
189 * Find a stream. The consumer_data.lock must be locked during this
192 static struct lttng_consumer_stream
*find_stream(uint64_t key
,
195 struct lttng_ht_iter iter
;
196 struct lttng_ht_node_u64
*node
;
197 struct lttng_consumer_stream
*stream
= NULL
;
201 /* -1ULL keys are lookup failures */
202 if (key
== (uint64_t) -1ULL) {
208 lttng_ht_lookup(ht
, &key
, &iter
);
209 node
= lttng_ht_iter_get_node_u64(&iter
);
211 stream
= caa_container_of(node
, struct lttng_consumer_stream
, node
);
219 static void steal_stream_key(uint64_t key
, struct lttng_ht
*ht
)
221 struct lttng_consumer_stream
*stream
;
224 stream
= find_stream(key
, ht
);
226 stream
->key
= (uint64_t) -1ULL;
228 * We don't want the lookup to match, but we still need
229 * to iterate on this stream when iterating over the hash table. Just
230 * change the node key.
232 stream
->node
.key
= (uint64_t) -1ULL;
238 * Return a channel object for the given key.
240 * RCU read side lock MUST be acquired before calling this function and
241 * protects the channel ptr.
243 struct lttng_consumer_channel
*consumer_find_channel(uint64_t key
)
245 struct lttng_ht_iter iter
;
246 struct lttng_ht_node_u64
*node
;
247 struct lttng_consumer_channel
*channel
= NULL
;
249 /* -1ULL keys are lookup failures */
250 if (key
== (uint64_t) -1ULL) {
254 lttng_ht_lookup(consumer_data
.channel_ht
, &key
, &iter
);
255 node
= lttng_ht_iter_get_node_u64(&iter
);
257 channel
= caa_container_of(node
, struct lttng_consumer_channel
, node
);
264 * There is a possibility that the consumer does not have enough time between
265 * the close of the channel on the session daemon and the cleanup in here thus
266 * once we have a channel add with an existing key, we know for sure that this
267 * channel will eventually get cleaned up by all streams being closed.
269 * This function just nullifies the already existing channel key.
271 static void steal_channel_key(uint64_t key
)
273 struct lttng_consumer_channel
*channel
;
276 channel
= consumer_find_channel(key
);
278 channel
->key
= (uint64_t) -1ULL;
280 * We don't want the lookup to match, but we still need to iterate on
281 * this channel when iterating over the hash table. Just change the
284 channel
->node
.key
= (uint64_t) -1ULL;
289 static void free_channel_rcu(struct rcu_head
*head
)
291 struct lttng_ht_node_u64
*node
=
292 caa_container_of(head
, struct lttng_ht_node_u64
, head
);
293 struct lttng_consumer_channel
*channel
=
294 caa_container_of(node
, struct lttng_consumer_channel
, node
);
296 switch (consumer_data
.type
) {
297 case LTTNG_CONSUMER_KERNEL
:
299 case LTTNG_CONSUMER32_UST
:
300 case LTTNG_CONSUMER64_UST
:
301 lttng_ustconsumer_free_channel(channel
);
304 ERR("Unknown consumer_data type");
311 * RCU protected relayd socket pair free.
313 static void free_relayd_rcu(struct rcu_head
*head
)
315 struct lttng_ht_node_u64
*node
=
316 caa_container_of(head
, struct lttng_ht_node_u64
, head
);
317 struct consumer_relayd_sock_pair
*relayd
=
318 caa_container_of(node
, struct consumer_relayd_sock_pair
, node
);
321 * Close all sockets. This is done in the call RCU since we don't want the
322 * socket fds to be reassigned thus potentially creating bad state of the
325 * We do not have to lock the control socket mutex here since at this stage
326 * there is no one referencing to this relayd object.
328 (void) relayd_close(&relayd
->control_sock
);
329 (void) relayd_close(&relayd
->data_sock
);
331 pthread_mutex_destroy(&relayd
->ctrl_sock_mutex
);
336 * Destroy and free relayd socket pair object.
338 void consumer_destroy_relayd(struct consumer_relayd_sock_pair
*relayd
)
341 struct lttng_ht_iter iter
;
343 if (relayd
== NULL
) {
347 DBG("Consumer destroy and close relayd socket pair");
349 iter
.iter
.node
= &relayd
->node
.node
;
350 ret
= lttng_ht_del(consumer_data
.relayd_ht
, &iter
);
352 /* We assume the relayd is being or is destroyed */
356 /* RCU free() call */
357 call_rcu(&relayd
->node
.head
, free_relayd_rcu
);
361 * Remove a channel from the global list protected by a mutex. This function is
362 * also responsible for freeing its data structures.
364 void consumer_del_channel(struct lttng_consumer_channel
*channel
)
366 struct lttng_ht_iter iter
;
368 DBG("Consumer delete channel key %" PRIu64
, channel
->key
);
370 pthread_mutex_lock(&consumer_data
.lock
);
371 pthread_mutex_lock(&channel
->lock
);
373 /* Destroy streams that might have been left in the stream list. */
374 clean_channel_stream_list(channel
);
376 if (channel
->live_timer_enabled
== 1) {
377 consumer_timer_live_stop(channel
);
379 if (channel
->monitor_timer_enabled
== 1) {
380 consumer_timer_monitor_stop(channel
);
383 switch (consumer_data
.type
) {
384 case LTTNG_CONSUMER_KERNEL
:
386 case LTTNG_CONSUMER32_UST
:
387 case LTTNG_CONSUMER64_UST
:
388 lttng_ustconsumer_del_channel(channel
);
391 ERR("Unknown consumer_data type");
396 lttng_trace_chunk_put(channel
->trace_chunk
);
397 channel
->trace_chunk
= NULL
;
399 if (channel
->is_published
) {
403 iter
.iter
.node
= &channel
->node
.node
;
404 ret
= lttng_ht_del(consumer_data
.channel_ht
, &iter
);
407 iter
.iter
.node
= &channel
->channels_by_session_id_ht_node
.node
;
408 ret
= lttng_ht_del(consumer_data
.channels_by_session_id_ht
,
414 channel
->is_deleted
= true;
415 call_rcu(&channel
->node
.head
, free_channel_rcu
);
417 pthread_mutex_unlock(&channel
->lock
);
418 pthread_mutex_unlock(&consumer_data
.lock
);
422 * Iterate over the relayd hash table and destroy each element. Finally,
423 * destroy the whole hash table.
425 static void cleanup_relayd_ht(void)
427 struct lttng_ht_iter iter
;
428 struct consumer_relayd_sock_pair
*relayd
;
432 cds_lfht_for_each_entry(consumer_data
.relayd_ht
->ht
, &iter
.iter
, relayd
,
434 consumer_destroy_relayd(relayd
);
439 lttng_ht_destroy(consumer_data
.relayd_ht
);
443 * Update the end point status of all streams having the given network sequence
444 * index (relayd index).
446 * It's atomically set without having the stream mutex locked which is fine
447 * because we handle the write/read race with a pipe wakeup for each thread.
449 static void update_endpoint_status_by_netidx(uint64_t net_seq_idx
,
450 enum consumer_endpoint_status status
)
452 struct lttng_ht_iter iter
;
453 struct lttng_consumer_stream
*stream
;
455 DBG("Consumer set delete flag on stream by idx %" PRIu64
, net_seq_idx
);
459 /* Let's begin with metadata */
460 cds_lfht_for_each_entry(metadata_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
461 if (stream
->net_seq_idx
== net_seq_idx
) {
462 uatomic_set(&stream
->endpoint_status
, status
);
463 DBG("Delete flag set to metadata stream %d", stream
->wait_fd
);
467 /* Follow up by the data streams */
468 cds_lfht_for_each_entry(data_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
469 if (stream
->net_seq_idx
== net_seq_idx
) {
470 uatomic_set(&stream
->endpoint_status
, status
);
471 DBG("Delete flag set to data stream %d", stream
->wait_fd
);
478 * Cleanup a relayd object by flagging every associated streams for deletion,
479 * destroying the object meaning removing it from the relayd hash table,
480 * closing the sockets and freeing the memory in a RCU call.
482 * If a local data context is available, notify the threads that the streams'
483 * state have changed.
485 void lttng_consumer_cleanup_relayd(struct consumer_relayd_sock_pair
*relayd
)
491 DBG("Cleaning up relayd object ID %"PRIu64
, relayd
->net_seq_idx
);
493 /* Save the net sequence index before destroying the object */
494 netidx
= relayd
->net_seq_idx
;
497 * Delete the relayd from the relayd hash table, close the sockets and free
498 * the object in a RCU call.
500 consumer_destroy_relayd(relayd
);
502 /* Set inactive endpoint to all streams */
503 update_endpoint_status_by_netidx(netidx
, CONSUMER_ENDPOINT_INACTIVE
);
506 * With a local data context, notify the threads that the streams' state
507 * have changed. The write() action on the pipe acts as an "implicit"
508 * memory barrier ordering the updates of the end point status from the
509 * read of this status which happens AFTER receiving this notify.
511 notify_thread_lttng_pipe(relayd
->ctx
->consumer_data_pipe
);
512 notify_thread_lttng_pipe(relayd
->ctx
->consumer_metadata_pipe
);
516 * Flag a relayd socket pair for destruction. Destroy it if the refcount
519 * RCU read side lock MUST be aquired before calling this function.
521 void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair
*relayd
)
525 /* Set destroy flag for this object */
526 uatomic_set(&relayd
->destroy_flag
, 1);
528 /* Destroy the relayd if refcount is 0 */
529 if (uatomic_read(&relayd
->refcount
) == 0) {
530 consumer_destroy_relayd(relayd
);
535 * Completly destroy stream from every visiable data structure and the given
538 * One this call returns, the stream object is not longer usable nor visible.
540 void consumer_del_stream(struct lttng_consumer_stream
*stream
,
543 consumer_stream_destroy(stream
, ht
);
547 * XXX naming of del vs destroy is all mixed up.
549 void consumer_del_stream_for_data(struct lttng_consumer_stream
*stream
)
551 consumer_stream_destroy(stream
, data_ht
);
554 void consumer_del_stream_for_metadata(struct lttng_consumer_stream
*stream
)
556 consumer_stream_destroy(stream
, metadata_ht
);
559 void consumer_stream_update_channel_attributes(
560 struct lttng_consumer_stream
*stream
,
561 struct lttng_consumer_channel
*channel
)
563 stream
->channel_read_only_attributes
.tracefile_size
=
564 channel
->tracefile_size
;
567 struct lttng_consumer_stream
*consumer_allocate_stream(uint64_t channel_key
,
569 const char *channel_name
,
572 struct lttng_trace_chunk
*trace_chunk
,
575 enum consumer_channel_type type
,
576 unsigned int monitor
)
579 struct lttng_consumer_stream
*stream
;
581 stream
= zmalloc(sizeof(*stream
));
582 if (stream
== NULL
) {
583 PERROR("malloc struct lttng_consumer_stream");
588 if (trace_chunk
&& !lttng_trace_chunk_get(trace_chunk
)) {
589 ERR("Failed to acquire trace chunk reference during the creation of a stream");
595 stream
->key
= stream_key
;
596 stream
->trace_chunk
= trace_chunk
;
598 stream
->out_fd_offset
= 0;
599 stream
->output_written
= 0;
600 stream
->net_seq_idx
= relayd_id
;
601 stream
->session_id
= session_id
;
602 stream
->monitor
= monitor
;
603 stream
->endpoint_status
= CONSUMER_ENDPOINT_ACTIVE
;
604 stream
->index_file
= NULL
;
605 stream
->last_sequence_number
= -1ULL;
606 stream
->rotate_position
= -1ULL;
607 pthread_mutex_init(&stream
->lock
, NULL
);
608 pthread_mutex_init(&stream
->metadata_timer_lock
, NULL
);
610 /* If channel is the metadata, flag this stream as metadata. */
611 if (type
== CONSUMER_CHANNEL_TYPE_METADATA
) {
612 stream
->metadata_flag
= 1;
613 /* Metadata is flat out. */
614 strncpy(stream
->name
, DEFAULT_METADATA_NAME
, sizeof(stream
->name
));
615 /* Live rendez-vous point. */
616 pthread_cond_init(&stream
->metadata_rdv
, NULL
);
617 pthread_mutex_init(&stream
->metadata_rdv_lock
, NULL
);
619 /* Format stream name to <channel_name>_<cpu_number> */
620 ret
= snprintf(stream
->name
, sizeof(stream
->name
), "%s_%d",
623 PERROR("snprintf stream name");
628 /* Key is always the wait_fd for streams. */
629 lttng_ht_node_init_u64(&stream
->node
, stream
->key
);
631 /* Init node per channel id key */
632 lttng_ht_node_init_u64(&stream
->node_channel_id
, channel_key
);
634 /* Init session id node with the stream session id */
635 lttng_ht_node_init_u64(&stream
->node_session_id
, stream
->session_id
);
637 DBG3("Allocated stream %s (key %" PRIu64
", chan_key %" PRIu64
638 " relayd_id %" PRIu64
", session_id %" PRIu64
,
639 stream
->name
, stream
->key
, channel_key
,
640 stream
->net_seq_idx
, stream
->session_id
);
647 lttng_trace_chunk_put(stream
->trace_chunk
);
657 * Add a stream to the global list protected by a mutex.
659 void consumer_add_data_stream(struct lttng_consumer_stream
*stream
)
661 struct lttng_ht
*ht
= data_ht
;
666 DBG3("Adding consumer stream %" PRIu64
, stream
->key
);
668 pthread_mutex_lock(&consumer_data
.lock
);
669 pthread_mutex_lock(&stream
->chan
->lock
);
670 pthread_mutex_lock(&stream
->chan
->timer_lock
);
671 pthread_mutex_lock(&stream
->lock
);
674 /* Steal stream identifier to avoid having streams with the same key */
675 steal_stream_key(stream
->key
, ht
);
677 lttng_ht_add_unique_u64(ht
, &stream
->node
);
679 lttng_ht_add_u64(consumer_data
.stream_per_chan_id_ht
,
680 &stream
->node_channel_id
);
683 * Add stream to the stream_list_ht of the consumer data. No need to steal
684 * the key since the HT does not use it and we allow to add redundant keys
687 lttng_ht_add_u64(consumer_data
.stream_list_ht
, &stream
->node_session_id
);
690 * When nb_init_stream_left reaches 0, we don't need to trigger any action
691 * in terms of destroying the associated channel, because the action that
692 * causes the count to become 0 also causes a stream to be added. The
693 * channel deletion will thus be triggered by the following removal of this
696 if (uatomic_read(&stream
->chan
->nb_init_stream_left
) > 0) {
697 /* Increment refcount before decrementing nb_init_stream_left */
699 uatomic_dec(&stream
->chan
->nb_init_stream_left
);
702 /* Update consumer data once the node is inserted. */
703 consumer_data
.stream_count
++;
704 consumer_data
.need_update
= 1;
707 pthread_mutex_unlock(&stream
->lock
);
708 pthread_mutex_unlock(&stream
->chan
->timer_lock
);
709 pthread_mutex_unlock(&stream
->chan
->lock
);
710 pthread_mutex_unlock(&consumer_data
.lock
);
713 void consumer_del_data_stream(struct lttng_consumer_stream
*stream
)
715 consumer_del_stream(stream
, data_ht
);
719 * Add relayd socket to global consumer data hashtable. RCU read side lock MUST
720 * be acquired before calling this.
722 static int add_relayd(struct consumer_relayd_sock_pair
*relayd
)
725 struct lttng_ht_node_u64
*node
;
726 struct lttng_ht_iter iter
;
730 lttng_ht_lookup(consumer_data
.relayd_ht
,
731 &relayd
->net_seq_idx
, &iter
);
732 node
= lttng_ht_iter_get_node_u64(&iter
);
736 lttng_ht_add_unique_u64(consumer_data
.relayd_ht
, &relayd
->node
);
743 * Allocate and return a consumer relayd socket.
745 static struct consumer_relayd_sock_pair
*consumer_allocate_relayd_sock_pair(
746 uint64_t net_seq_idx
)
748 struct consumer_relayd_sock_pair
*obj
= NULL
;
750 /* net sequence index of -1 is a failure */
751 if (net_seq_idx
== (uint64_t) -1ULL) {
755 obj
= zmalloc(sizeof(struct consumer_relayd_sock_pair
));
757 PERROR("zmalloc relayd sock");
761 obj
->net_seq_idx
= net_seq_idx
;
763 obj
->destroy_flag
= 0;
764 obj
->control_sock
.sock
.fd
= -1;
765 obj
->data_sock
.sock
.fd
= -1;
766 lttng_ht_node_init_u64(&obj
->node
, obj
->net_seq_idx
);
767 pthread_mutex_init(&obj
->ctrl_sock_mutex
, NULL
);
774 * Find a relayd socket pair in the global consumer data.
776 * Return the object if found else NULL.
777 * RCU read-side lock must be held across this call and while using the
780 struct consumer_relayd_sock_pair
*consumer_find_relayd(uint64_t key
)
782 struct lttng_ht_iter iter
;
783 struct lttng_ht_node_u64
*node
;
784 struct consumer_relayd_sock_pair
*relayd
= NULL
;
786 /* Negative keys are lookup failures */
787 if (key
== (uint64_t) -1ULL) {
791 lttng_ht_lookup(consumer_data
.relayd_ht
, &key
,
793 node
= lttng_ht_iter_get_node_u64(&iter
);
795 relayd
= caa_container_of(node
, struct consumer_relayd_sock_pair
, node
);
803 * Find a relayd and send the stream
805 * Returns 0 on success, < 0 on error
807 int consumer_send_relayd_stream(struct lttng_consumer_stream
*stream
,
811 struct consumer_relayd_sock_pair
*relayd
;
814 assert(stream
->net_seq_idx
!= -1ULL);
817 /* The stream is not metadata. Get relayd reference if exists. */
819 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
820 if (relayd
!= NULL
) {
821 /* Add stream on the relayd */
822 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
823 ret
= relayd_add_stream(&relayd
->control_sock
, stream
->name
,
824 path
, &stream
->relayd_stream_id
,
825 stream
->chan
->tracefile_size
,
826 stream
->chan
->tracefile_count
,
827 stream
->trace_chunk
);
828 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
830 ERR("Relayd add stream failed. Cleaning up relayd %" PRIu64
".", relayd
->net_seq_idx
);
831 lttng_consumer_cleanup_relayd(relayd
);
835 uatomic_inc(&relayd
->refcount
);
836 stream
->sent_to_relayd
= 1;
838 ERR("Stream %" PRIu64
" relayd ID %" PRIu64
" unknown. Can't send it.",
839 stream
->key
, stream
->net_seq_idx
);
844 DBG("Stream %s with key %" PRIu64
" sent to relayd id %" PRIu64
,
845 stream
->name
, stream
->key
, stream
->net_seq_idx
);
853 * Find a relayd and send the streams sent message
855 * Returns 0 on success, < 0 on error
857 int consumer_send_relayd_streams_sent(uint64_t net_seq_idx
)
860 struct consumer_relayd_sock_pair
*relayd
;
862 assert(net_seq_idx
!= -1ULL);
864 /* The stream is not metadata. Get relayd reference if exists. */
866 relayd
= consumer_find_relayd(net_seq_idx
);
867 if (relayd
!= NULL
) {
868 /* Add stream on the relayd */
869 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
870 ret
= relayd_streams_sent(&relayd
->control_sock
);
871 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
873 ERR("Relayd streams sent failed. Cleaning up relayd %" PRIu64
".", relayd
->net_seq_idx
);
874 lttng_consumer_cleanup_relayd(relayd
);
878 ERR("Relayd ID %" PRIu64
" unknown. Can't send streams_sent.",
885 DBG("All streams sent relayd id %" PRIu64
, net_seq_idx
);
893 * Find a relayd and close the stream
895 void close_relayd_stream(struct lttng_consumer_stream
*stream
)
897 struct consumer_relayd_sock_pair
*relayd
;
899 /* The stream is not metadata. Get relayd reference if exists. */
901 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
903 consumer_stream_relayd_close(stream
, relayd
);
909 * Handle stream for relayd transmission if the stream applies for network
910 * streaming where the net sequence index is set.
912 * Return destination file descriptor or negative value on error.
914 static int write_relayd_stream_header(struct lttng_consumer_stream
*stream
,
915 size_t data_size
, unsigned long padding
,
916 struct consumer_relayd_sock_pair
*relayd
)
919 struct lttcomm_relayd_data_hdr data_hdr
;
925 /* Reset data header */
926 memset(&data_hdr
, 0, sizeof(data_hdr
));
928 if (stream
->metadata_flag
) {
929 /* Caller MUST acquire the relayd control socket lock */
930 ret
= relayd_send_metadata(&relayd
->control_sock
, data_size
);
935 /* Metadata are always sent on the control socket. */
936 outfd
= relayd
->control_sock
.sock
.fd
;
938 /* Set header with stream information */
939 data_hdr
.stream_id
= htobe64(stream
->relayd_stream_id
);
940 data_hdr
.data_size
= htobe32(data_size
);
941 data_hdr
.padding_size
= htobe32(padding
);
944 * Note that net_seq_num below is assigned with the *current* value of
945 * next_net_seq_num and only after that the next_net_seq_num will be
946 * increment. This is why when issuing a command on the relayd using
947 * this next value, 1 should always be substracted in order to compare
948 * the last seen sequence number on the relayd side to the last sent.
950 data_hdr
.net_seq_num
= htobe64(stream
->next_net_seq_num
);
951 /* Other fields are zeroed previously */
953 ret
= relayd_send_data_hdr(&relayd
->data_sock
, &data_hdr
,
959 ++stream
->next_net_seq_num
;
961 /* Set to go on data socket */
962 outfd
= relayd
->data_sock
.sock
.fd
;
970 * Trigger a dump of the metadata content. Following/during the succesful
971 * completion of this call, the metadata poll thread will start receiving
972 * metadata packets to consume.
974 * The caller must hold the channel and stream locks.
977 int consumer_metadata_stream_dump(struct lttng_consumer_stream
*stream
)
981 ASSERT_LOCKED(stream
->chan
->lock
);
982 ASSERT_LOCKED(stream
->lock
);
983 assert(stream
->metadata_flag
);
984 assert(stream
->chan
->trace_chunk
);
986 switch (consumer_data
.type
) {
987 case LTTNG_CONSUMER_KERNEL
:
989 * Reset the position of what has been read from the
990 * metadata cache to 0 so we can dump it again.
992 ret
= kernctl_metadata_cache_dump(stream
->wait_fd
);
994 case LTTNG_CONSUMER32_UST
:
995 case LTTNG_CONSUMER64_UST
:
997 * Reset the position pushed from the metadata cache so it
998 * will write from the beginning on the next push.
1000 stream
->ust_metadata_pushed
= 0;
1001 ret
= consumer_metadata_wakeup_pipe(stream
->chan
);
1004 ERR("Unknown consumer_data type");
1008 ERR("Failed to dump the metadata cache");
1014 int lttng_consumer_channel_set_trace_chunk(
1015 struct lttng_consumer_channel
*channel
,
1016 struct lttng_trace_chunk
*new_trace_chunk
)
1018 pthread_mutex_lock(&channel
->lock
);
1019 if (channel
->is_deleted
) {
1021 * The channel has been logically deleted and should no longer
1022 * be used. It has released its reference to its current trace
1023 * chunk and should not acquire a new one.
1025 * Return success as there is nothing for the caller to do.
1031 * The acquisition of the reference cannot fail (barring
1032 * a severe internal error) since a reference to the published
1033 * chunk is already held by the caller.
1035 if (new_trace_chunk
) {
1036 const bool acquired_reference
= lttng_trace_chunk_get(
1039 assert(acquired_reference
);
1042 lttng_trace_chunk_put(channel
->trace_chunk
);
1043 channel
->trace_chunk
= new_trace_chunk
;
1045 pthread_mutex_unlock(&channel
->lock
);
1050 * Allocate and return a new lttng_consumer_channel object using the given key
1051 * to initialize the hash table node.
1053 * On error, return NULL.
1055 struct lttng_consumer_channel
*consumer_allocate_channel(uint64_t key
,
1056 uint64_t session_id
,
1057 const uint64_t *chunk_id
,
1058 const char *pathname
,
1061 enum lttng_event_output output
,
1062 uint64_t tracefile_size
,
1063 uint64_t tracefile_count
,
1064 uint64_t session_id_per_pid
,
1065 unsigned int monitor
,
1066 unsigned int live_timer_interval
,
1067 const char *root_shm_path
,
1068 const char *shm_path
)
1070 struct lttng_consumer_channel
*channel
= NULL
;
1071 struct lttng_trace_chunk
*trace_chunk
= NULL
;
1074 trace_chunk
= lttng_trace_chunk_registry_find_chunk(
1075 consumer_data
.chunk_registry
, session_id
,
1078 ERR("Failed to find trace chunk reference during creation of channel");
1083 channel
= zmalloc(sizeof(*channel
));
1084 if (channel
== NULL
) {
1085 PERROR("malloc struct lttng_consumer_channel");
1090 channel
->refcount
= 0;
1091 channel
->session_id
= session_id
;
1092 channel
->session_id_per_pid
= session_id_per_pid
;
1093 channel
->relayd_id
= relayd_id
;
1094 channel
->tracefile_size
= tracefile_size
;
1095 channel
->tracefile_count
= tracefile_count
;
1096 channel
->monitor
= monitor
;
1097 channel
->live_timer_interval
= live_timer_interval
;
1098 pthread_mutex_init(&channel
->lock
, NULL
);
1099 pthread_mutex_init(&channel
->timer_lock
, NULL
);
1102 case LTTNG_EVENT_SPLICE
:
1103 channel
->output
= CONSUMER_CHANNEL_SPLICE
;
1105 case LTTNG_EVENT_MMAP
:
1106 channel
->output
= CONSUMER_CHANNEL_MMAP
;
1116 * In monitor mode, the streams associated with the channel will be put in
1117 * a special list ONLY owned by this channel. So, the refcount is set to 1
1118 * here meaning that the channel itself has streams that are referenced.
1120 * On a channel deletion, once the channel is no longer visible, the
1121 * refcount is decremented and checked for a zero value to delete it. With
1122 * streams in no monitor mode, it will now be safe to destroy the channel.
1124 if (!channel
->monitor
) {
1125 channel
->refcount
= 1;
1128 strncpy(channel
->pathname
, pathname
, sizeof(channel
->pathname
));
1129 channel
->pathname
[sizeof(channel
->pathname
) - 1] = '\0';
1131 strncpy(channel
->name
, name
, sizeof(channel
->name
));
1132 channel
->name
[sizeof(channel
->name
) - 1] = '\0';
1134 if (root_shm_path
) {
1135 strncpy(channel
->root_shm_path
, root_shm_path
, sizeof(channel
->root_shm_path
));
1136 channel
->root_shm_path
[sizeof(channel
->root_shm_path
) - 1] = '\0';
1139 strncpy(channel
->shm_path
, shm_path
, sizeof(channel
->shm_path
));
1140 channel
->shm_path
[sizeof(channel
->shm_path
) - 1] = '\0';
1143 lttng_ht_node_init_u64(&channel
->node
, channel
->key
);
1144 lttng_ht_node_init_u64(&channel
->channels_by_session_id_ht_node
,
1145 channel
->session_id
);
1147 channel
->wait_fd
= -1;
1148 CDS_INIT_LIST_HEAD(&channel
->streams
.head
);
1151 int ret
= lttng_consumer_channel_set_trace_chunk(channel
,
1158 DBG("Allocated channel (key %" PRIu64
")", channel
->key
);
1161 lttng_trace_chunk_put(trace_chunk
);
1164 consumer_del_channel(channel
);
1170 * Add a channel to the global list protected by a mutex.
1172 * Always return 0 indicating success.
1174 int consumer_add_channel(struct lttng_consumer_channel
*channel
,
1175 struct lttng_consumer_local_data
*ctx
)
1177 pthread_mutex_lock(&consumer_data
.lock
);
1178 pthread_mutex_lock(&channel
->lock
);
1179 pthread_mutex_lock(&channel
->timer_lock
);
1182 * This gives us a guarantee that the channel we are about to add to the
1183 * channel hash table will be unique. See this function comment on the why
1184 * we need to steel the channel key at this stage.
1186 steal_channel_key(channel
->key
);
1189 lttng_ht_add_unique_u64(consumer_data
.channel_ht
, &channel
->node
);
1190 lttng_ht_add_u64(consumer_data
.channels_by_session_id_ht
,
1191 &channel
->channels_by_session_id_ht_node
);
1193 channel
->is_published
= true;
1195 pthread_mutex_unlock(&channel
->timer_lock
);
1196 pthread_mutex_unlock(&channel
->lock
);
1197 pthread_mutex_unlock(&consumer_data
.lock
);
1199 if (channel
->wait_fd
!= -1 && channel
->type
== CONSUMER_CHANNEL_TYPE_DATA
) {
1200 notify_channel_pipe(ctx
, channel
, -1, CONSUMER_CHANNEL_ADD
);
1207 * Allocate the pollfd structure and the local view of the out fds to avoid
1208 * doing a lookup in the linked list and concurrency issues when writing is
1209 * needed. Called with consumer_data.lock held.
1211 * Returns the number of fds in the structures.
1213 static int update_poll_array(struct lttng_consumer_local_data
*ctx
,
1214 struct pollfd
**pollfd
, struct lttng_consumer_stream
**local_stream
,
1215 struct lttng_ht
*ht
, int *nb_inactive_fd
)
1218 struct lttng_ht_iter iter
;
1219 struct lttng_consumer_stream
*stream
;
1224 assert(local_stream
);
1226 DBG("Updating poll fd array");
1227 *nb_inactive_fd
= 0;
1229 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
1231 * Only active streams with an active end point can be added to the
1232 * poll set and local stream storage of the thread.
1234 * There is a potential race here for endpoint_status to be updated
1235 * just after the check. However, this is OK since the stream(s) will
1236 * be deleted once the thread is notified that the end point state has
1237 * changed where this function will be called back again.
1239 * We track the number of inactive FDs because they still need to be
1240 * closed by the polling thread after a wakeup on the data_pipe or
1243 if (stream
->endpoint_status
== CONSUMER_ENDPOINT_INACTIVE
) {
1244 (*nb_inactive_fd
)++;
1248 * This clobbers way too much the debug output. Uncomment that if you
1249 * need it for debugging purposes.
1251 (*pollfd
)[i
].fd
= stream
->wait_fd
;
1252 (*pollfd
)[i
].events
= POLLIN
| POLLPRI
;
1253 local_stream
[i
] = stream
;
1259 * Insert the consumer_data_pipe at the end of the array and don't
1260 * increment i so nb_fd is the number of real FD.
1262 (*pollfd
)[i
].fd
= lttng_pipe_get_readfd(ctx
->consumer_data_pipe
);
1263 (*pollfd
)[i
].events
= POLLIN
| POLLPRI
;
1265 (*pollfd
)[i
+ 1].fd
= lttng_pipe_get_readfd(ctx
->consumer_wakeup_pipe
);
1266 (*pollfd
)[i
+ 1].events
= POLLIN
| POLLPRI
;
1271 * Poll on the should_quit pipe and the command socket return -1 on
1272 * error, 1 if should exit, 0 if data is available on the command socket
1274 int lttng_consumer_poll_socket(struct pollfd
*consumer_sockpoll
)
1279 num_rdy
= poll(consumer_sockpoll
, 2, -1);
1280 if (num_rdy
== -1) {
1282 * Restart interrupted system call.
1284 if (errno
== EINTR
) {
1287 PERROR("Poll error");
1290 if (consumer_sockpoll
[0].revents
& (POLLIN
| POLLPRI
)) {
1291 DBG("consumer_should_quit wake up");
1298 * Set the error socket.
1300 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data
*ctx
,
1303 ctx
->consumer_error_socket
= sock
;
1307 * Set the command socket path.
1309 void lttng_consumer_set_command_sock_path(
1310 struct lttng_consumer_local_data
*ctx
, char *sock
)
1312 ctx
->consumer_command_sock_path
= sock
;
1316 * Send return code to the session daemon.
1317 * If the socket is not defined, we return 0, it is not a fatal error
1319 int lttng_consumer_send_error(struct lttng_consumer_local_data
*ctx
, int cmd
)
1321 if (ctx
->consumer_error_socket
> 0) {
1322 return lttcomm_send_unix_sock(ctx
->consumer_error_socket
, &cmd
,
1323 sizeof(enum lttcomm_sessiond_command
));
1330 * Close all the tracefiles and stream fds and MUST be called when all
1331 * instances are destroyed i.e. when all threads were joined and are ended.
1333 void lttng_consumer_cleanup(void)
1335 struct lttng_ht_iter iter
;
1336 struct lttng_consumer_channel
*channel
;
1337 unsigned int trace_chunks_left
;
1341 cds_lfht_for_each_entry(consumer_data
.channel_ht
->ht
, &iter
.iter
, channel
,
1343 consumer_del_channel(channel
);
1348 lttng_ht_destroy(consumer_data
.channel_ht
);
1349 lttng_ht_destroy(consumer_data
.channels_by_session_id_ht
);
1351 cleanup_relayd_ht();
1353 lttng_ht_destroy(consumer_data
.stream_per_chan_id_ht
);
1356 * This HT contains streams that are freed by either the metadata thread or
1357 * the data thread so we do *nothing* on the hash table and simply destroy
1360 lttng_ht_destroy(consumer_data
.stream_list_ht
);
1363 * Trace chunks in the registry may still exist if the session
1364 * daemon has encountered an internal error and could not
1365 * tear down its sessions and/or trace chunks properly.
1367 * Release the session daemon's implicit reference to any remaining
1368 * trace chunk and print an error if any trace chunk was found. Note
1369 * that there are _no_ legitimate cases for trace chunks to be left,
1370 * it is a leak. However, it can happen following a crash of the
1371 * session daemon and not emptying the registry would cause an assertion
1374 trace_chunks_left
= lttng_trace_chunk_registry_put_each_chunk(
1375 consumer_data
.chunk_registry
);
1376 if (trace_chunks_left
) {
1377 ERR("%u trace chunks are leaked by lttng-consumerd. "
1378 "This can be caused by an internal error of the session daemon.",
1381 /* Run all callbacks freeing each chunk. */
1383 lttng_trace_chunk_registry_destroy(consumer_data
.chunk_registry
);
1387 * Called from signal handler.
1389 void lttng_consumer_should_exit(struct lttng_consumer_local_data
*ctx
)
1393 CMM_STORE_SHARED(consumer_quit
, 1);
1394 ret
= lttng_write(ctx
->consumer_should_quit
[1], "4", 1);
1396 PERROR("write consumer quit");
1399 DBG("Consumer flag that it should quit");
1404 * Flush pending writes to trace output disk file.
1407 void lttng_consumer_sync_trace_file(struct lttng_consumer_stream
*stream
,
1411 int outfd
= stream
->out_fd
;
1414 * This does a blocking write-and-wait on any page that belongs to the
1415 * subbuffer prior to the one we just wrote.
1416 * Don't care about error values, as these are just hints and ways to
1417 * limit the amount of page cache used.
1419 if (orig_offset
< stream
->max_sb_size
) {
1422 lttng_sync_file_range(outfd
, orig_offset
- stream
->max_sb_size
,
1423 stream
->max_sb_size
,
1424 SYNC_FILE_RANGE_WAIT_BEFORE
1425 | SYNC_FILE_RANGE_WRITE
1426 | SYNC_FILE_RANGE_WAIT_AFTER
);
1428 * Give hints to the kernel about how we access the file:
1429 * POSIX_FADV_DONTNEED : we won't re-access data in a near future after
1432 * We need to call fadvise again after the file grows because the
1433 * kernel does not seem to apply fadvise to non-existing parts of the
1436 * Call fadvise _after_ having waited for the page writeback to
1437 * complete because the dirty page writeback semantic is not well
1438 * defined. So it can be expected to lead to lower throughput in
1441 ret
= posix_fadvise(outfd
, orig_offset
- stream
->max_sb_size
,
1442 stream
->max_sb_size
, POSIX_FADV_DONTNEED
);
1443 if (ret
&& ret
!= -ENOSYS
) {
1445 PERROR("posix_fadvise on fd %i", outfd
);
1450 * Initialise the necessary environnement :
1451 * - create a new context
1452 * - create the poll_pipe
1453 * - create the should_quit pipe (for signal handler)
1454 * - create the thread pipe (for splice)
1456 * Takes a function pointer as argument, this function is called when data is
1457 * available on a buffer. This function is responsible to do the
1458 * kernctl_get_next_subbuf, read the data with mmap or splice depending on the
1459 * buffer configuration and then kernctl_put_next_subbuf at the end.
1461 * Returns a pointer to the new context or NULL on error.
1463 struct lttng_consumer_local_data
*lttng_consumer_create(
1464 enum lttng_consumer_type type
,
1465 ssize_t (*buffer_ready
)(struct lttng_consumer_stream
*stream
,
1466 struct lttng_consumer_local_data
*ctx
),
1467 int (*recv_channel
)(struct lttng_consumer_channel
*channel
),
1468 int (*recv_stream
)(struct lttng_consumer_stream
*stream
),
1469 int (*update_stream
)(uint64_t stream_key
, uint32_t state
))
1472 struct lttng_consumer_local_data
*ctx
;
1474 assert(consumer_data
.type
== LTTNG_CONSUMER_UNKNOWN
||
1475 consumer_data
.type
== type
);
1476 consumer_data
.type
= type
;
1478 ctx
= zmalloc(sizeof(struct lttng_consumer_local_data
));
1480 PERROR("allocating context");
1484 ctx
->consumer_error_socket
= -1;
1485 ctx
->consumer_metadata_socket
= -1;
1486 pthread_mutex_init(&ctx
->metadata_socket_lock
, NULL
);
1487 /* assign the callbacks */
1488 ctx
->on_buffer_ready
= buffer_ready
;
1489 ctx
->on_recv_channel
= recv_channel
;
1490 ctx
->on_recv_stream
= recv_stream
;
1491 ctx
->on_update_stream
= update_stream
;
1493 ctx
->consumer_data_pipe
= lttng_pipe_open(0);
1494 if (!ctx
->consumer_data_pipe
) {
1495 goto error_poll_pipe
;
1498 ctx
->consumer_wakeup_pipe
= lttng_pipe_open(0);
1499 if (!ctx
->consumer_wakeup_pipe
) {
1500 goto error_wakeup_pipe
;
1503 ret
= pipe(ctx
->consumer_should_quit
);
1505 PERROR("Error creating recv pipe");
1506 goto error_quit_pipe
;
1509 ret
= pipe(ctx
->consumer_channel_pipe
);
1511 PERROR("Error creating channel pipe");
1512 goto error_channel_pipe
;
1515 ctx
->consumer_metadata_pipe
= lttng_pipe_open(0);
1516 if (!ctx
->consumer_metadata_pipe
) {
1517 goto error_metadata_pipe
;
1520 ctx
->channel_monitor_pipe
= -1;
1524 error_metadata_pipe
:
1525 utils_close_pipe(ctx
->consumer_channel_pipe
);
1527 utils_close_pipe(ctx
->consumer_should_quit
);
1529 lttng_pipe_destroy(ctx
->consumer_wakeup_pipe
);
1531 lttng_pipe_destroy(ctx
->consumer_data_pipe
);
1539 * Iterate over all streams of the hashtable and free them properly.
1541 static void destroy_data_stream_ht(struct lttng_ht
*ht
)
1543 struct lttng_ht_iter iter
;
1544 struct lttng_consumer_stream
*stream
;
1551 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
1553 * Ignore return value since we are currently cleaning up so any error
1556 (void) consumer_del_stream(stream
, ht
);
1560 lttng_ht_destroy(ht
);
1564 * Iterate over all streams of the metadata hashtable and free them
1567 static void destroy_metadata_stream_ht(struct lttng_ht
*ht
)
1569 struct lttng_ht_iter iter
;
1570 struct lttng_consumer_stream
*stream
;
1577 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
1579 * Ignore return value since we are currently cleaning up so any error
1582 (void) consumer_del_metadata_stream(stream
, ht
);
1586 lttng_ht_destroy(ht
);
1590 * Close all fds associated with the instance and free the context.
1592 void lttng_consumer_destroy(struct lttng_consumer_local_data
*ctx
)
1596 DBG("Consumer destroying it. Closing everything.");
1602 destroy_data_stream_ht(data_ht
);
1603 destroy_metadata_stream_ht(metadata_ht
);
1605 ret
= close(ctx
->consumer_error_socket
);
1609 ret
= close(ctx
->consumer_metadata_socket
);
1613 utils_close_pipe(ctx
->consumer_channel_pipe
);
1614 lttng_pipe_destroy(ctx
->consumer_data_pipe
);
1615 lttng_pipe_destroy(ctx
->consumer_metadata_pipe
);
1616 lttng_pipe_destroy(ctx
->consumer_wakeup_pipe
);
1617 utils_close_pipe(ctx
->consumer_should_quit
);
1619 unlink(ctx
->consumer_command_sock_path
);
1624 * Write the metadata stream id on the specified file descriptor.
1626 static int write_relayd_metadata_id(int fd
,
1627 struct lttng_consumer_stream
*stream
,
1628 unsigned long padding
)
1631 struct lttcomm_relayd_metadata_payload hdr
;
1633 hdr
.stream_id
= htobe64(stream
->relayd_stream_id
);
1634 hdr
.padding_size
= htobe32(padding
);
1635 ret
= lttng_write(fd
, (void *) &hdr
, sizeof(hdr
));
1636 if (ret
< sizeof(hdr
)) {
1638 * This error means that the fd's end is closed so ignore the PERROR
1639 * not to clubber the error output since this can happen in a normal
1642 if (errno
!= EPIPE
) {
1643 PERROR("write metadata stream id");
1645 DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno
);
1647 * Set ret to a negative value because if ret != sizeof(hdr), we don't
1648 * handle writting the missing part so report that as an error and
1649 * don't lie to the caller.
1654 DBG("Metadata stream id %" PRIu64
" with padding %lu written before data",
1655 stream
->relayd_stream_id
, padding
);
1662 * Mmap the ring buffer, read it and write the data to the tracefile. This is a
1663 * core function for writing trace buffers to either the local filesystem or
1666 * It must be called with the stream and the channel lock held.
1668 * Careful review MUST be put if any changes occur!
1670 * Returns the number of bytes written
1672 ssize_t
lttng_consumer_on_read_subbuffer_mmap(
1673 struct lttng_consumer_local_data
*ctx
,
1674 struct lttng_consumer_stream
*stream
,
1675 const struct lttng_buffer_view
*buffer
,
1676 unsigned long padding
,
1677 struct ctf_packet_index
*index
)
1680 off_t orig_offset
= stream
->out_fd_offset
;
1681 /* Default is on the disk */
1682 int outfd
= stream
->out_fd
;
1683 struct consumer_relayd_sock_pair
*relayd
= NULL
;
1684 unsigned int relayd_hang_up
= 0;
1685 const size_t subbuf_content_size
= buffer
->size
- padding
;
1688 /* RCU lock for the relayd pointer */
1690 assert(stream
->net_seq_idx
!= (uint64_t) -1ULL ||
1691 stream
->trace_chunk
);
1693 /* Flag that the current stream if set for network streaming. */
1694 if (stream
->net_seq_idx
!= (uint64_t) -1ULL) {
1695 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
1696 if (relayd
== NULL
) {
1702 /* Handle stream on the relayd if the output is on the network */
1704 unsigned long netlen
= subbuf_content_size
;
1707 * Lock the control socket for the complete duration of the function
1708 * since from this point on we will use the socket.
1710 if (stream
->metadata_flag
) {
1711 /* Metadata requires the control socket. */
1712 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
1713 if (stream
->reset_metadata_flag
) {
1714 ret
= relayd_reset_metadata(&relayd
->control_sock
,
1715 stream
->relayd_stream_id
,
1716 stream
->metadata_version
);
1721 stream
->reset_metadata_flag
= 0;
1723 netlen
+= sizeof(struct lttcomm_relayd_metadata_payload
);
1726 ret
= write_relayd_stream_header(stream
, netlen
, padding
, relayd
);
1731 /* Use the returned socket. */
1734 /* Write metadata stream id before payload */
1735 if (stream
->metadata_flag
) {
1736 ret
= write_relayd_metadata_id(outfd
, stream
, padding
);
1743 write_len
= subbuf_content_size
;
1745 /* No streaming; we have to write the full padding. */
1746 if (stream
->metadata_flag
&& stream
->reset_metadata_flag
) {
1747 ret
= utils_truncate_stream_file(stream
->out_fd
, 0);
1749 ERR("Reset metadata file");
1752 stream
->reset_metadata_flag
= 0;
1756 * Check if we need to change the tracefile before writing the packet.
1758 if (stream
->chan
->tracefile_size
> 0 &&
1759 (stream
->tracefile_size_current
+ buffer
->size
) >
1760 stream
->chan
->tracefile_size
) {
1761 ret
= consumer_stream_rotate_output_files(stream
);
1765 outfd
= stream
->out_fd
;
1768 stream
->tracefile_size_current
+= buffer
->size
;
1770 index
->offset
= htobe64(stream
->out_fd_offset
);
1773 write_len
= buffer
->size
;
1777 * This call guarantee that len or less is returned. It's impossible to
1778 * receive a ret value that is bigger than len.
1780 ret
= lttng_write(outfd
, buffer
->data
, write_len
);
1781 DBG("Consumer mmap write() ret %zd (len %lu)", ret
, write_len
);
1782 if (ret
< 0 || ((size_t) ret
!= write_len
)) {
1784 * Report error to caller if nothing was written else at least send the
1792 /* Socket operation failed. We consider the relayd dead */
1793 if (errno
== EPIPE
) {
1795 * This is possible if the fd is closed on the other side
1796 * (outfd) or any write problem. It can be verbose a bit for a
1797 * normal execution if for instance the relayd is stopped
1798 * abruptly. This can happen so set this to a DBG statement.
1800 DBG("Consumer mmap write detected relayd hang up");
1802 /* Unhandled error, print it and stop function right now. */
1803 PERROR("Error in write mmap (ret %zd != write_len %zu)", ret
,
1808 stream
->output_written
+= ret
;
1810 /* This call is useless on a socket so better save a syscall. */
1812 /* This won't block, but will start writeout asynchronously */
1813 lttng_sync_file_range(outfd
, stream
->out_fd_offset
, write_len
,
1814 SYNC_FILE_RANGE_WRITE
);
1815 stream
->out_fd_offset
+= write_len
;
1816 lttng_consumer_sync_trace_file(stream
, orig_offset
);
1821 * This is a special case that the relayd has closed its socket. Let's
1822 * cleanup the relayd object and all associated streams.
1824 if (relayd
&& relayd_hang_up
) {
1825 ERR("Relayd hangup. Cleaning up relayd %" PRIu64
".", relayd
->net_seq_idx
);
1826 lttng_consumer_cleanup_relayd(relayd
);
1830 /* Unlock only if ctrl socket used */
1831 if (relayd
&& stream
->metadata_flag
) {
1832 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
1840 * Splice the data from the ring buffer to the tracefile.
1842 * It must be called with the stream lock held.
1844 * Returns the number of bytes spliced.
1846 ssize_t
lttng_consumer_on_read_subbuffer_splice(
1847 struct lttng_consumer_local_data
*ctx
,
1848 struct lttng_consumer_stream
*stream
, unsigned long len
,
1849 unsigned long padding
,
1850 struct ctf_packet_index
*index
)
1852 ssize_t ret
= 0, written
= 0, ret_splice
= 0;
1854 off_t orig_offset
= stream
->out_fd_offset
;
1855 int fd
= stream
->wait_fd
;
1856 /* Default is on the disk */
1857 int outfd
= stream
->out_fd
;
1858 struct consumer_relayd_sock_pair
*relayd
= NULL
;
1860 unsigned int relayd_hang_up
= 0;
1862 switch (consumer_data
.type
) {
1863 case LTTNG_CONSUMER_KERNEL
:
1865 case LTTNG_CONSUMER32_UST
:
1866 case LTTNG_CONSUMER64_UST
:
1867 /* Not supported for user space tracing */
1870 ERR("Unknown consumer_data type");
1874 /* RCU lock for the relayd pointer */
1877 /* Flag that the current stream if set for network streaming. */
1878 if (stream
->net_seq_idx
!= (uint64_t) -1ULL) {
1879 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
1880 if (relayd
== NULL
) {
1885 splice_pipe
= stream
->splice_pipe
;
1887 /* Write metadata stream id before payload */
1889 unsigned long total_len
= len
;
1891 if (stream
->metadata_flag
) {
1893 * Lock the control socket for the complete duration of the function
1894 * since from this point on we will use the socket.
1896 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
1898 if (stream
->reset_metadata_flag
) {
1899 ret
= relayd_reset_metadata(&relayd
->control_sock
,
1900 stream
->relayd_stream_id
,
1901 stream
->metadata_version
);
1906 stream
->reset_metadata_flag
= 0;
1908 ret
= write_relayd_metadata_id(splice_pipe
[1], stream
,
1916 total_len
+= sizeof(struct lttcomm_relayd_metadata_payload
);
1919 ret
= write_relayd_stream_header(stream
, total_len
, padding
, relayd
);
1925 /* Use the returned socket. */
1928 /* No streaming, we have to set the len with the full padding */
1931 if (stream
->metadata_flag
&& stream
->reset_metadata_flag
) {
1932 ret
= utils_truncate_stream_file(stream
->out_fd
, 0);
1934 ERR("Reset metadata file");
1937 stream
->reset_metadata_flag
= 0;
1940 * Check if we need to change the tracefile before writing the packet.
1942 if (stream
->chan
->tracefile_size
> 0 &&
1943 (stream
->tracefile_size_current
+ len
) >
1944 stream
->chan
->tracefile_size
) {
1945 ret
= consumer_stream_rotate_output_files(stream
);
1950 outfd
= stream
->out_fd
;
1953 stream
->tracefile_size_current
+= len
;
1954 index
->offset
= htobe64(stream
->out_fd_offset
);
1958 DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)",
1959 (unsigned long)offset
, len
, fd
, splice_pipe
[1]);
1960 ret_splice
= splice(fd
, &offset
, splice_pipe
[1], NULL
, len
,
1961 SPLICE_F_MOVE
| SPLICE_F_MORE
);
1962 DBG("splice chan to pipe, ret %zd", ret_splice
);
1963 if (ret_splice
< 0) {
1966 PERROR("Error in relay splice");
1970 /* Handle stream on the relayd if the output is on the network */
1971 if (relayd
&& stream
->metadata_flag
) {
1972 size_t metadata_payload_size
=
1973 sizeof(struct lttcomm_relayd_metadata_payload
);
1975 /* Update counter to fit the spliced data */
1976 ret_splice
+= metadata_payload_size
;
1977 len
+= metadata_payload_size
;
1979 * We do this so the return value can match the len passed as
1980 * argument to this function.
1982 written
-= metadata_payload_size
;
1985 /* Splice data out */
1986 ret_splice
= splice(splice_pipe
[0], NULL
, outfd
, NULL
,
1987 ret_splice
, SPLICE_F_MOVE
| SPLICE_F_MORE
);
1988 DBG("Consumer splice pipe to file (out_fd: %d), ret %zd",
1990 if (ret_splice
< 0) {
1995 } else if (ret_splice
> len
) {
1997 * We don't expect this code path to be executed but you never know
1998 * so this is an extra protection agains a buggy splice().
2001 written
+= ret_splice
;
2002 PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice
,
2006 /* All good, update current len and continue. */
2010 /* This call is useless on a socket so better save a syscall. */
2012 /* This won't block, but will start writeout asynchronously */
2013 lttng_sync_file_range(outfd
, stream
->out_fd_offset
, ret_splice
,
2014 SYNC_FILE_RANGE_WRITE
);
2015 stream
->out_fd_offset
+= ret_splice
;
2017 stream
->output_written
+= ret_splice
;
2018 written
+= ret_splice
;
2021 lttng_consumer_sync_trace_file(stream
, orig_offset
);
2027 * This is a special case that the relayd has closed its socket. Let's
2028 * cleanup the relayd object and all associated streams.
2030 if (relayd
&& relayd_hang_up
) {
2031 ERR("Relayd hangup. Cleaning up relayd %" PRIu64
".", relayd
->net_seq_idx
);
2032 lttng_consumer_cleanup_relayd(relayd
);
2033 /* Skip splice error so the consumer does not fail */
2038 /* send the appropriate error description to sessiond */
2041 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_EINVAL
);
2044 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_ENOMEM
);
2047 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_ESPIPE
);
2052 if (relayd
&& stream
->metadata_flag
) {
2053 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
2061 * Sample the snapshot positions for a specific fd
2063 * Returns 0 on success, < 0 on error
2065 int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream
*stream
)
2067 switch (consumer_data
.type
) {
2068 case LTTNG_CONSUMER_KERNEL
:
2069 return lttng_kconsumer_sample_snapshot_positions(stream
);
2070 case LTTNG_CONSUMER32_UST
:
2071 case LTTNG_CONSUMER64_UST
:
2072 return lttng_ustconsumer_sample_snapshot_positions(stream
);
2074 ERR("Unknown consumer_data type");
2080 * Take a snapshot for a specific fd
2082 * Returns 0 on success, < 0 on error
2084 int lttng_consumer_take_snapshot(struct lttng_consumer_stream
*stream
)
2086 switch (consumer_data
.type
) {
2087 case LTTNG_CONSUMER_KERNEL
:
2088 return lttng_kconsumer_take_snapshot(stream
);
2089 case LTTNG_CONSUMER32_UST
:
2090 case LTTNG_CONSUMER64_UST
:
2091 return lttng_ustconsumer_take_snapshot(stream
);
2093 ERR("Unknown consumer_data type");
2100 * Get the produced position
2102 * Returns 0 on success, < 0 on error
2104 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream
*stream
,
2107 switch (consumer_data
.type
) {
2108 case LTTNG_CONSUMER_KERNEL
:
2109 return lttng_kconsumer_get_produced_snapshot(stream
, pos
);
2110 case LTTNG_CONSUMER32_UST
:
2111 case LTTNG_CONSUMER64_UST
:
2112 return lttng_ustconsumer_get_produced_snapshot(stream
, pos
);
2114 ERR("Unknown consumer_data type");
2121 * Get the consumed position (free-running counter position in bytes).
2123 * Returns 0 on success, < 0 on error
2125 int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream
*stream
,
2128 switch (consumer_data
.type
) {
2129 case LTTNG_CONSUMER_KERNEL
:
2130 return lttng_kconsumer_get_consumed_snapshot(stream
, pos
);
2131 case LTTNG_CONSUMER32_UST
:
2132 case LTTNG_CONSUMER64_UST
:
2133 return lttng_ustconsumer_get_consumed_snapshot(stream
, pos
);
2135 ERR("Unknown consumer_data type");
2141 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
2142 int sock
, struct pollfd
*consumer_sockpoll
)
2144 switch (consumer_data
.type
) {
2145 case LTTNG_CONSUMER_KERNEL
:
2146 return lttng_kconsumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
2147 case LTTNG_CONSUMER32_UST
:
2148 case LTTNG_CONSUMER64_UST
:
2149 return lttng_ustconsumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
2151 ERR("Unknown consumer_data type");
2157 void lttng_consumer_close_all_metadata(void)
2159 switch (consumer_data
.type
) {
2160 case LTTNG_CONSUMER_KERNEL
:
2162 * The Kernel consumer has a different metadata scheme so we don't
2163 * close anything because the stream will be closed by the session
2167 case LTTNG_CONSUMER32_UST
:
2168 case LTTNG_CONSUMER64_UST
:
2170 * Close all metadata streams. The metadata hash table is passed and
2171 * this call iterates over it by closing all wakeup fd. This is safe
2172 * because at this point we are sure that the metadata producer is
2173 * either dead or blocked.
2175 lttng_ustconsumer_close_all_metadata(metadata_ht
);
2178 ERR("Unknown consumer_data type");
2184 * Clean up a metadata stream and free its memory.
2186 void consumer_del_metadata_stream(struct lttng_consumer_stream
*stream
,
2187 struct lttng_ht
*ht
)
2189 struct lttng_consumer_channel
*channel
= NULL
;
2190 bool free_channel
= false;
2194 * This call should NEVER receive regular stream. It must always be
2195 * metadata stream and this is crucial for data structure synchronization.
2197 assert(stream
->metadata_flag
);
2199 DBG3("Consumer delete metadata stream %d", stream
->wait_fd
);
2201 pthread_mutex_lock(&consumer_data
.lock
);
2203 * Note that this assumes that a stream's channel is never changed and
2204 * that the stream's lock doesn't need to be taken to sample its
2207 channel
= stream
->chan
;
2208 pthread_mutex_lock(&channel
->lock
);
2209 pthread_mutex_lock(&stream
->lock
);
2210 if (channel
->metadata_cache
) {
2211 /* Only applicable to userspace consumers. */
2212 pthread_mutex_lock(&channel
->metadata_cache
->lock
);
2215 /* Remove any reference to that stream. */
2216 consumer_stream_delete(stream
, ht
);
2218 /* Close down everything including the relayd if one. */
2219 consumer_stream_close(stream
);
2220 /* Destroy tracer buffers of the stream. */
2221 consumer_stream_destroy_buffers(stream
);
2223 /* Atomically decrement channel refcount since other threads can use it. */
2224 if (!uatomic_sub_return(&channel
->refcount
, 1)
2225 && !uatomic_read(&channel
->nb_init_stream_left
)) {
2226 /* Go for channel deletion! */
2227 free_channel
= true;
2229 stream
->chan
= NULL
;
2232 * Nullify the stream reference so it is not used after deletion. The
2233 * channel lock MUST be acquired before being able to check for a NULL
2236 channel
->metadata_stream
= NULL
;
2238 if (channel
->metadata_cache
) {
2239 pthread_mutex_unlock(&channel
->metadata_cache
->lock
);
2241 pthread_mutex_unlock(&stream
->lock
);
2242 pthread_mutex_unlock(&channel
->lock
);
2243 pthread_mutex_unlock(&consumer_data
.lock
);
2246 consumer_del_channel(channel
);
2249 lttng_trace_chunk_put(stream
->trace_chunk
);
2250 stream
->trace_chunk
= NULL
;
2251 consumer_stream_free(stream
);
2255 * Action done with the metadata stream when adding it to the consumer internal
2256 * data structures to handle it.
2258 void consumer_add_metadata_stream(struct lttng_consumer_stream
*stream
)
2260 struct lttng_ht
*ht
= metadata_ht
;
2261 struct lttng_ht_iter iter
;
2262 struct lttng_ht_node_u64
*node
;
2267 DBG3("Adding metadata stream %" PRIu64
" to hash table", stream
->key
);
2269 pthread_mutex_lock(&consumer_data
.lock
);
2270 pthread_mutex_lock(&stream
->chan
->lock
);
2271 pthread_mutex_lock(&stream
->chan
->timer_lock
);
2272 pthread_mutex_lock(&stream
->lock
);
2275 * From here, refcounts are updated so be _careful_ when returning an error
2282 * Lookup the stream just to make sure it does not exist in our internal
2283 * state. This should NEVER happen.
2285 lttng_ht_lookup(ht
, &stream
->key
, &iter
);
2286 node
= lttng_ht_iter_get_node_u64(&iter
);
2290 * When nb_init_stream_left reaches 0, we don't need to trigger any action
2291 * in terms of destroying the associated channel, because the action that
2292 * causes the count to become 0 also causes a stream to be added. The
2293 * channel deletion will thus be triggered by the following removal of this
2296 if (uatomic_read(&stream
->chan
->nb_init_stream_left
) > 0) {
2297 /* Increment refcount before decrementing nb_init_stream_left */
2299 uatomic_dec(&stream
->chan
->nb_init_stream_left
);
2302 lttng_ht_add_unique_u64(ht
, &stream
->node
);
2304 lttng_ht_add_u64(consumer_data
.stream_per_chan_id_ht
,
2305 &stream
->node_channel_id
);
2308 * Add stream to the stream_list_ht of the consumer data. No need to steal
2309 * the key since the HT does not use it and we allow to add redundant keys
2312 lttng_ht_add_u64(consumer_data
.stream_list_ht
, &stream
->node_session_id
);
2316 pthread_mutex_unlock(&stream
->lock
);
2317 pthread_mutex_unlock(&stream
->chan
->lock
);
2318 pthread_mutex_unlock(&stream
->chan
->timer_lock
);
2319 pthread_mutex_unlock(&consumer_data
.lock
);
2323 * Delete data stream that are flagged for deletion (endpoint_status).
2325 static void validate_endpoint_status_data_stream(void)
2327 struct lttng_ht_iter iter
;
2328 struct lttng_consumer_stream
*stream
;
2330 DBG("Consumer delete flagged data stream");
2333 cds_lfht_for_each_entry(data_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
2334 /* Validate delete flag of the stream */
2335 if (stream
->endpoint_status
== CONSUMER_ENDPOINT_ACTIVE
) {
2338 /* Delete it right now */
2339 consumer_del_stream(stream
, data_ht
);
2345 * Delete metadata stream that are flagged for deletion (endpoint_status).
2347 static void validate_endpoint_status_metadata_stream(
2348 struct lttng_poll_event
*pollset
)
2350 struct lttng_ht_iter iter
;
2351 struct lttng_consumer_stream
*stream
;
2353 DBG("Consumer delete flagged metadata stream");
2358 cds_lfht_for_each_entry(metadata_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
2359 /* Validate delete flag of the stream */
2360 if (stream
->endpoint_status
== CONSUMER_ENDPOINT_ACTIVE
) {
2364 * Remove from pollset so the metadata thread can continue without
2365 * blocking on a deleted stream.
2367 lttng_poll_del(pollset
, stream
->wait_fd
);
2369 /* Delete it right now */
2370 consumer_del_metadata_stream(stream
, metadata_ht
);
2376 * Thread polls on metadata file descriptor and write them on disk or on the
2379 void *consumer_thread_metadata_poll(void *data
)
2381 int ret
, i
, pollfd
, err
= -1;
2382 uint32_t revents
, nb_fd
;
2383 struct lttng_consumer_stream
*stream
= NULL
;
2384 struct lttng_ht_iter iter
;
2385 struct lttng_ht_node_u64
*node
;
2386 struct lttng_poll_event events
;
2387 struct lttng_consumer_local_data
*ctx
= data
;
2390 rcu_register_thread();
2392 health_register(health_consumerd
, HEALTH_CONSUMERD_TYPE_METADATA
);
2394 if (testpoint(consumerd_thread_metadata
)) {
2395 goto error_testpoint
;
2398 health_code_update();
2400 DBG("Thread metadata poll started");
2402 /* Size is set to 1 for the consumer_metadata pipe */
2403 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
2405 ERR("Poll set creation failed");
2409 ret
= lttng_poll_add(&events
,
2410 lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
), LPOLLIN
);
2416 DBG("Metadata main loop started");
2420 health_code_update();
2421 health_poll_entry();
2422 DBG("Metadata poll wait");
2423 ret
= lttng_poll_wait(&events
, -1);
2424 DBG("Metadata poll return from wait with %d fd(s)",
2425 LTTNG_POLL_GETNB(&events
));
2427 DBG("Metadata event caught in thread");
2429 if (errno
== EINTR
) {
2430 ERR("Poll EINTR caught");
2433 if (LTTNG_POLL_GETNB(&events
) == 0) {
2434 err
= 0; /* All is OK */
2441 /* From here, the event is a metadata wait fd */
2442 for (i
= 0; i
< nb_fd
; i
++) {
2443 health_code_update();
2445 revents
= LTTNG_POLL_GETEV(&events
, i
);
2446 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2448 if (pollfd
== lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
)) {
2449 if (revents
& LPOLLIN
) {
2452 pipe_len
= lttng_pipe_read(ctx
->consumer_metadata_pipe
,
2453 &stream
, sizeof(stream
));
2454 if (pipe_len
< sizeof(stream
)) {
2456 PERROR("read metadata stream");
2459 * Remove the pipe from the poll set and continue the loop
2460 * since their might be data to consume.
2462 lttng_poll_del(&events
,
2463 lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
));
2464 lttng_pipe_read_close(ctx
->consumer_metadata_pipe
);
2468 /* A NULL stream means that the state has changed. */
2469 if (stream
== NULL
) {
2470 /* Check for deleted streams. */
2471 validate_endpoint_status_metadata_stream(&events
);
2475 DBG("Adding metadata stream %d to poll set",
2478 /* Add metadata stream to the global poll events list */
2479 lttng_poll_add(&events
, stream
->wait_fd
,
2480 LPOLLIN
| LPOLLPRI
| LPOLLHUP
);
2481 } else if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2482 DBG("Metadata thread pipe hung up");
2484 * Remove the pipe from the poll set and continue the loop
2485 * since their might be data to consume.
2487 lttng_poll_del(&events
,
2488 lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
));
2489 lttng_pipe_read_close(ctx
->consumer_metadata_pipe
);
2492 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2496 /* Handle other stream */
2502 uint64_t tmp_id
= (uint64_t) pollfd
;
2504 lttng_ht_lookup(metadata_ht
, &tmp_id
, &iter
);
2506 node
= lttng_ht_iter_get_node_u64(&iter
);
2509 stream
= caa_container_of(node
, struct lttng_consumer_stream
,
2512 if (revents
& (LPOLLIN
| LPOLLPRI
)) {
2513 /* Get the data out of the metadata file descriptor */
2514 DBG("Metadata available on fd %d", pollfd
);
2515 assert(stream
->wait_fd
== pollfd
);
2518 health_code_update();
2520 len
= ctx
->on_buffer_ready(stream
, ctx
);
2522 * We don't check the return value here since if we get
2523 * a negative len, it means an error occurred thus we
2524 * simply remove it from the poll set and free the
2529 /* It's ok to have an unavailable sub-buffer */
2530 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2531 /* Clean up stream from consumer and free it. */
2532 lttng_poll_del(&events
, stream
->wait_fd
);
2533 consumer_del_metadata_stream(stream
, metadata_ht
);
2535 } else if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2536 DBG("Metadata fd %d is hup|err.", pollfd
);
2537 if (!stream
->hangup_flush_done
2538 && (consumer_data
.type
== LTTNG_CONSUMER32_UST
2539 || consumer_data
.type
== LTTNG_CONSUMER64_UST
)) {
2540 DBG("Attempting to flush and consume the UST buffers");
2541 lttng_ustconsumer_on_stream_hangup(stream
);
2543 /* We just flushed the stream now read it. */
2545 health_code_update();
2547 len
= ctx
->on_buffer_ready(stream
, ctx
);
2549 * We don't check the return value here since if we get
2550 * a negative len, it means an error occurred thus we
2551 * simply remove it from the poll set and free the
2557 lttng_poll_del(&events
, stream
->wait_fd
);
2559 * This call update the channel states, closes file descriptors
2560 * and securely free the stream.
2562 consumer_del_metadata_stream(stream
, metadata_ht
);
2564 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2568 /* Release RCU lock for the stream looked up */
2576 DBG("Metadata poll thread exiting");
2578 lttng_poll_clean(&events
);
2583 ERR("Health error occurred in %s", __func__
);
2585 health_unregister(health_consumerd
);
2586 rcu_unregister_thread();
2591 * This thread polls the fds in the set to consume the data and write
2592 * it to tracefile if necessary.
2594 void *consumer_thread_data_poll(void *data
)
2596 int num_rdy
, num_hup
, high_prio
, ret
, i
, err
= -1;
2597 struct pollfd
*pollfd
= NULL
;
2598 /* local view of the streams */
2599 struct lttng_consumer_stream
**local_stream
= NULL
, *new_stream
= NULL
;
2600 /* local view of consumer_data.fds_count */
2602 /* 2 for the consumer_data_pipe and wake up pipe */
2603 const int nb_pipes_fd
= 2;
2604 /* Number of FDs with CONSUMER_ENDPOINT_INACTIVE but still open. */
2605 int nb_inactive_fd
= 0;
2606 struct lttng_consumer_local_data
*ctx
= data
;
2609 rcu_register_thread();
2611 health_register(health_consumerd
, HEALTH_CONSUMERD_TYPE_DATA
);
2613 if (testpoint(consumerd_thread_data
)) {
2614 goto error_testpoint
;
2617 health_code_update();
2619 local_stream
= zmalloc(sizeof(struct lttng_consumer_stream
*));
2620 if (local_stream
== NULL
) {
2621 PERROR("local_stream malloc");
2626 health_code_update();
2632 * the fds set has been updated, we need to update our
2633 * local array as well
2635 pthread_mutex_lock(&consumer_data
.lock
);
2636 if (consumer_data
.need_update
) {
2641 local_stream
= NULL
;
2643 /* Allocate for all fds */
2644 pollfd
= zmalloc((consumer_data
.stream_count
+ nb_pipes_fd
) * sizeof(struct pollfd
));
2645 if (pollfd
== NULL
) {
2646 PERROR("pollfd malloc");
2647 pthread_mutex_unlock(&consumer_data
.lock
);
2651 local_stream
= zmalloc((consumer_data
.stream_count
+ nb_pipes_fd
) *
2652 sizeof(struct lttng_consumer_stream
*));
2653 if (local_stream
== NULL
) {
2654 PERROR("local_stream malloc");
2655 pthread_mutex_unlock(&consumer_data
.lock
);
2658 ret
= update_poll_array(ctx
, &pollfd
, local_stream
,
2659 data_ht
, &nb_inactive_fd
);
2661 ERR("Error in allocating pollfd or local_outfds");
2662 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
2663 pthread_mutex_unlock(&consumer_data
.lock
);
2667 consumer_data
.need_update
= 0;
2669 pthread_mutex_unlock(&consumer_data
.lock
);
2671 /* No FDs and consumer_quit, consumer_cleanup the thread */
2672 if (nb_fd
== 0 && nb_inactive_fd
== 0 &&
2673 CMM_LOAD_SHARED(consumer_quit
) == 1) {
2674 err
= 0; /* All is OK */
2677 /* poll on the array of fds */
2679 DBG("polling on %d fd", nb_fd
+ nb_pipes_fd
);
2680 if (testpoint(consumerd_thread_data_poll
)) {
2683 health_poll_entry();
2684 num_rdy
= poll(pollfd
, nb_fd
+ nb_pipes_fd
, -1);
2686 DBG("poll num_rdy : %d", num_rdy
);
2687 if (num_rdy
== -1) {
2689 * Restart interrupted system call.
2691 if (errno
== EINTR
) {
2694 PERROR("Poll error");
2695 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
2697 } else if (num_rdy
== 0) {
2698 DBG("Polling thread timed out");
2702 if (caa_unlikely(data_consumption_paused
)) {
2703 DBG("Data consumption paused, sleeping...");
2709 * If the consumer_data_pipe triggered poll go directly to the
2710 * beginning of the loop to update the array. We want to prioritize
2711 * array update over low-priority reads.
2713 if (pollfd
[nb_fd
].revents
& (POLLIN
| POLLPRI
)) {
2714 ssize_t pipe_readlen
;
2716 DBG("consumer_data_pipe wake up");
2717 pipe_readlen
= lttng_pipe_read(ctx
->consumer_data_pipe
,
2718 &new_stream
, sizeof(new_stream
));
2719 if (pipe_readlen
< sizeof(new_stream
)) {
2720 PERROR("Consumer data pipe");
2721 /* Continue so we can at least handle the current stream(s). */
2726 * If the stream is NULL, just ignore it. It's also possible that
2727 * the sessiond poll thread changed the consumer_quit state and is
2728 * waking us up to test it.
2730 if (new_stream
== NULL
) {
2731 validate_endpoint_status_data_stream();
2735 /* Continue to update the local streams and handle prio ones */
2739 /* Handle wakeup pipe. */
2740 if (pollfd
[nb_fd
+ 1].revents
& (POLLIN
| POLLPRI
)) {
2742 ssize_t pipe_readlen
;
2744 pipe_readlen
= lttng_pipe_read(ctx
->consumer_wakeup_pipe
, &dummy
,
2746 if (pipe_readlen
< 0) {
2747 PERROR("Consumer data wakeup pipe");
2749 /* We've been awakened to handle stream(s). */
2750 ctx
->has_wakeup
= 0;
2753 /* Take care of high priority channels first. */
2754 for (i
= 0; i
< nb_fd
; i
++) {
2755 health_code_update();
2757 if (local_stream
[i
] == NULL
) {
2760 if (pollfd
[i
].revents
& POLLPRI
) {
2761 DBG("Urgent read on fd %d", pollfd
[i
].fd
);
2763 len
= ctx
->on_buffer_ready(local_stream
[i
], ctx
);
2764 /* it's ok to have an unavailable sub-buffer */
2765 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2766 /* Clean the stream and free it. */
2767 consumer_del_stream(local_stream
[i
], data_ht
);
2768 local_stream
[i
] = NULL
;
2769 } else if (len
> 0) {
2770 local_stream
[i
]->data_read
= 1;
2776 * If we read high prio channel in this loop, try again
2777 * for more high prio data.
2783 /* Take care of low priority channels. */
2784 for (i
= 0; i
< nb_fd
; i
++) {
2785 health_code_update();
2787 if (local_stream
[i
] == NULL
) {
2790 if ((pollfd
[i
].revents
& POLLIN
) ||
2791 local_stream
[i
]->hangup_flush_done
||
2792 local_stream
[i
]->has_data
) {
2793 DBG("Normal read on fd %d", pollfd
[i
].fd
);
2794 len
= ctx
->on_buffer_ready(local_stream
[i
], ctx
);
2795 /* it's ok to have an unavailable sub-buffer */
2796 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2797 /* Clean the stream and free it. */
2798 consumer_del_stream(local_stream
[i
], data_ht
);
2799 local_stream
[i
] = NULL
;
2800 } else if (len
> 0) {
2801 local_stream
[i
]->data_read
= 1;
2806 /* Handle hangup and errors */
2807 for (i
= 0; i
< nb_fd
; i
++) {
2808 health_code_update();
2810 if (local_stream
[i
] == NULL
) {
2813 if (!local_stream
[i
]->hangup_flush_done
2814 && (pollfd
[i
].revents
& (POLLHUP
| POLLERR
| POLLNVAL
))
2815 && (consumer_data
.type
== LTTNG_CONSUMER32_UST
2816 || consumer_data
.type
== LTTNG_CONSUMER64_UST
)) {
2817 DBG("fd %d is hup|err|nval. Attempting flush and read.",
2819 lttng_ustconsumer_on_stream_hangup(local_stream
[i
]);
2820 /* Attempt read again, for the data we just flushed. */
2821 local_stream
[i
]->data_read
= 1;
2824 * If the poll flag is HUP/ERR/NVAL and we have
2825 * read no data in this pass, we can remove the
2826 * stream from its hash table.
2828 if ((pollfd
[i
].revents
& POLLHUP
)) {
2829 DBG("Polling fd %d tells it has hung up.", pollfd
[i
].fd
);
2830 if (!local_stream
[i
]->data_read
) {
2831 consumer_del_stream(local_stream
[i
], data_ht
);
2832 local_stream
[i
] = NULL
;
2835 } else if (pollfd
[i
].revents
& POLLERR
) {
2836 ERR("Error returned in polling fd %d.", pollfd
[i
].fd
);
2837 if (!local_stream
[i
]->data_read
) {
2838 consumer_del_stream(local_stream
[i
], data_ht
);
2839 local_stream
[i
] = NULL
;
2842 } else if (pollfd
[i
].revents
& POLLNVAL
) {
2843 ERR("Polling fd %d tells fd is not open.", pollfd
[i
].fd
);
2844 if (!local_stream
[i
]->data_read
) {
2845 consumer_del_stream(local_stream
[i
], data_ht
);
2846 local_stream
[i
] = NULL
;
2850 if (local_stream
[i
] != NULL
) {
2851 local_stream
[i
]->data_read
= 0;
2858 DBG("polling thread exiting");
2863 * Close the write side of the pipe so epoll_wait() in
2864 * consumer_thread_metadata_poll can catch it. The thread is monitoring the
2865 * read side of the pipe. If we close them both, epoll_wait strangely does
2866 * not return and could create a endless wait period if the pipe is the
2867 * only tracked fd in the poll set. The thread will take care of closing
2870 (void) lttng_pipe_write_close(ctx
->consumer_metadata_pipe
);
2875 ERR("Health error occurred in %s", __func__
);
2877 health_unregister(health_consumerd
);
2879 rcu_unregister_thread();
2884 * Close wake-up end of each stream belonging to the channel. This will
2885 * allow the poll() on the stream read-side to detect when the
2886 * write-side (application) finally closes them.
2889 void consumer_close_channel_streams(struct lttng_consumer_channel
*channel
)
2891 struct lttng_ht
*ht
;
2892 struct lttng_consumer_stream
*stream
;
2893 struct lttng_ht_iter iter
;
2895 ht
= consumer_data
.stream_per_chan_id_ht
;
2898 cds_lfht_for_each_entry_duplicate(ht
->ht
,
2899 ht
->hash_fct(&channel
->key
, lttng_ht_seed
),
2900 ht
->match_fct
, &channel
->key
,
2901 &iter
.iter
, stream
, node_channel_id
.node
) {
2903 * Protect against teardown with mutex.
2905 pthread_mutex_lock(&stream
->lock
);
2906 if (cds_lfht_is_node_deleted(&stream
->node
.node
)) {
2909 switch (consumer_data
.type
) {
2910 case LTTNG_CONSUMER_KERNEL
:
2912 case LTTNG_CONSUMER32_UST
:
2913 case LTTNG_CONSUMER64_UST
:
2914 if (stream
->metadata_flag
) {
2915 /* Safe and protected by the stream lock. */
2916 lttng_ustconsumer_close_metadata(stream
->chan
);
2919 * Note: a mutex is taken internally within
2920 * liblttng-ust-ctl to protect timer wakeup_fd
2921 * use from concurrent close.
2923 lttng_ustconsumer_close_stream_wakeup(stream
);
2927 ERR("Unknown consumer_data type");
2931 pthread_mutex_unlock(&stream
->lock
);
2936 static void destroy_channel_ht(struct lttng_ht
*ht
)
2938 struct lttng_ht_iter iter
;
2939 struct lttng_consumer_channel
*channel
;
2947 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, channel
, wait_fd_node
.node
) {
2948 ret
= lttng_ht_del(ht
, &iter
);
2953 lttng_ht_destroy(ht
);
2957 * This thread polls the channel fds to detect when they are being
2958 * closed. It closes all related streams if the channel is detected as
2959 * closed. It is currently only used as a shim layer for UST because the
2960 * consumerd needs to keep the per-stream wakeup end of pipes open for
2963 void *consumer_thread_channel_poll(void *data
)
2965 int ret
, i
, pollfd
, err
= -1;
2966 uint32_t revents
, nb_fd
;
2967 struct lttng_consumer_channel
*chan
= NULL
;
2968 struct lttng_ht_iter iter
;
2969 struct lttng_ht_node_u64
*node
;
2970 struct lttng_poll_event events
;
2971 struct lttng_consumer_local_data
*ctx
= data
;
2972 struct lttng_ht
*channel_ht
;
2974 rcu_register_thread();
2976 health_register(health_consumerd
, HEALTH_CONSUMERD_TYPE_CHANNEL
);
2978 if (testpoint(consumerd_thread_channel
)) {
2979 goto error_testpoint
;
2982 health_code_update();
2984 channel_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2986 /* ENOMEM at this point. Better to bail out. */
2990 DBG("Thread channel poll started");
2992 /* Size is set to 1 for the consumer_channel pipe */
2993 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
2995 ERR("Poll set creation failed");
2999 ret
= lttng_poll_add(&events
, ctx
->consumer_channel_pipe
[0], LPOLLIN
);
3005 DBG("Channel main loop started");
3009 health_code_update();
3010 DBG("Channel poll wait");
3011 health_poll_entry();
3012 ret
= lttng_poll_wait(&events
, -1);
3013 DBG("Channel poll return from wait with %d fd(s)",
3014 LTTNG_POLL_GETNB(&events
));
3016 DBG("Channel event caught in thread");
3018 if (errno
== EINTR
) {
3019 ERR("Poll EINTR caught");
3022 if (LTTNG_POLL_GETNB(&events
) == 0) {
3023 err
= 0; /* All is OK */
3030 /* From here, the event is a channel wait fd */
3031 for (i
= 0; i
< nb_fd
; i
++) {
3032 health_code_update();
3034 revents
= LTTNG_POLL_GETEV(&events
, i
);
3035 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3037 if (pollfd
== ctx
->consumer_channel_pipe
[0]) {
3038 if (revents
& LPOLLIN
) {
3039 enum consumer_channel_action action
;
3042 ret
= read_channel_pipe(ctx
, &chan
, &key
, &action
);
3045 ERR("Error reading channel pipe");
3047 lttng_poll_del(&events
, ctx
->consumer_channel_pipe
[0]);
3052 case CONSUMER_CHANNEL_ADD
:
3053 DBG("Adding channel %d to poll set",
3056 lttng_ht_node_init_u64(&chan
->wait_fd_node
,
3059 lttng_ht_add_unique_u64(channel_ht
,
3060 &chan
->wait_fd_node
);
3062 /* Add channel to the global poll events list */
3063 lttng_poll_add(&events
, chan
->wait_fd
,
3064 LPOLLERR
| LPOLLHUP
);
3066 case CONSUMER_CHANNEL_DEL
:
3069 * This command should never be called if the channel
3070 * has streams monitored by either the data or metadata
3071 * thread. The consumer only notify this thread with a
3072 * channel del. command if it receives a destroy
3073 * channel command from the session daemon that send it
3074 * if a command prior to the GET_CHANNEL failed.
3078 chan
= consumer_find_channel(key
);
3081 ERR("UST consumer get channel key %" PRIu64
" not found for del channel", key
);
3084 lttng_poll_del(&events
, chan
->wait_fd
);
3085 iter
.iter
.node
= &chan
->wait_fd_node
.node
;
3086 ret
= lttng_ht_del(channel_ht
, &iter
);
3089 switch (consumer_data
.type
) {
3090 case LTTNG_CONSUMER_KERNEL
:
3092 case LTTNG_CONSUMER32_UST
:
3093 case LTTNG_CONSUMER64_UST
:
3094 health_code_update();
3095 /* Destroy streams that might have been left in the stream list. */
3096 clean_channel_stream_list(chan
);
3099 ERR("Unknown consumer_data type");
3104 * Release our own refcount. Force channel deletion even if
3105 * streams were not initialized.
3107 if (!uatomic_sub_return(&chan
->refcount
, 1)) {
3108 consumer_del_channel(chan
);
3113 case CONSUMER_CHANNEL_QUIT
:
3115 * Remove the pipe from the poll set and continue the loop
3116 * since their might be data to consume.
3118 lttng_poll_del(&events
, ctx
->consumer_channel_pipe
[0]);
3121 ERR("Unknown action");
3124 } else if (revents
& (LPOLLERR
| LPOLLHUP
)) {
3125 DBG("Channel thread pipe hung up");
3127 * Remove the pipe from the poll set and continue the loop
3128 * since their might be data to consume.
3130 lttng_poll_del(&events
, ctx
->consumer_channel_pipe
[0]);
3133 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
3137 /* Handle other stream */
3143 uint64_t tmp_id
= (uint64_t) pollfd
;
3145 lttng_ht_lookup(channel_ht
, &tmp_id
, &iter
);
3147 node
= lttng_ht_iter_get_node_u64(&iter
);
3150 chan
= caa_container_of(node
, struct lttng_consumer_channel
,
3153 /* Check for error event */
3154 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
3155 DBG("Channel fd %d is hup|err.", pollfd
);
3157 lttng_poll_del(&events
, chan
->wait_fd
);
3158 ret
= lttng_ht_del(channel_ht
, &iter
);
3162 * This will close the wait fd for each stream associated to
3163 * this channel AND monitored by the data/metadata thread thus
3164 * will be clean by the right thread.
3166 consumer_close_channel_streams(chan
);
3168 /* Release our own refcount */
3169 if (!uatomic_sub_return(&chan
->refcount
, 1)
3170 && !uatomic_read(&chan
->nb_init_stream_left
)) {
3171 consumer_del_channel(chan
);
3174 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
3179 /* Release RCU lock for the channel looked up */
3187 lttng_poll_clean(&events
);
3189 destroy_channel_ht(channel_ht
);
3192 DBG("Channel poll thread exiting");
3195 ERR("Health error occurred in %s", __func__
);
3197 health_unregister(health_consumerd
);
3198 rcu_unregister_thread();
3202 static int set_metadata_socket(struct lttng_consumer_local_data
*ctx
,
3203 struct pollfd
*sockpoll
, int client_socket
)
3210 ret
= lttng_consumer_poll_socket(sockpoll
);
3214 DBG("Metadata connection on client_socket");
3216 /* Blocking call, waiting for transmission */
3217 ctx
->consumer_metadata_socket
= lttcomm_accept_unix_sock(client_socket
);
3218 if (ctx
->consumer_metadata_socket
< 0) {
3219 WARN("On accept metadata");
3230 * This thread listens on the consumerd socket and receives the file
3231 * descriptors from the session daemon.
3233 void *consumer_thread_sessiond_poll(void *data
)
3235 int sock
= -1, client_socket
, ret
, err
= -1;
3237 * structure to poll for incoming data on communication socket avoids
3238 * making blocking sockets.
3240 struct pollfd consumer_sockpoll
[2];
3241 struct lttng_consumer_local_data
*ctx
= data
;
3243 rcu_register_thread();
3245 health_register(health_consumerd
, HEALTH_CONSUMERD_TYPE_SESSIOND
);
3247 if (testpoint(consumerd_thread_sessiond
)) {
3248 goto error_testpoint
;
3251 health_code_update();
3253 DBG("Creating command socket %s", ctx
->consumer_command_sock_path
);
3254 unlink(ctx
->consumer_command_sock_path
);
3255 client_socket
= lttcomm_create_unix_sock(ctx
->consumer_command_sock_path
);
3256 if (client_socket
< 0) {
3257 ERR("Cannot create command socket");
3261 ret
= lttcomm_listen_unix_sock(client_socket
);
3266 DBG("Sending ready command to lttng-sessiond");
3267 ret
= lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
);
3268 /* return < 0 on error, but == 0 is not fatal */
3270 ERR("Error sending ready command to lttng-sessiond");
3274 /* prepare the FDs to poll : to client socket and the should_quit pipe */
3275 consumer_sockpoll
[0].fd
= ctx
->consumer_should_quit
[0];
3276 consumer_sockpoll
[0].events
= POLLIN
| POLLPRI
;
3277 consumer_sockpoll
[1].fd
= client_socket
;
3278 consumer_sockpoll
[1].events
= POLLIN
| POLLPRI
;
3280 ret
= lttng_consumer_poll_socket(consumer_sockpoll
);
3288 DBG("Connection on client_socket");
3290 /* Blocking call, waiting for transmission */
3291 sock
= lttcomm_accept_unix_sock(client_socket
);
3298 * Setup metadata socket which is the second socket connection on the
3299 * command unix socket.
3301 ret
= set_metadata_socket(ctx
, consumer_sockpoll
, client_socket
);
3310 /* This socket is not useful anymore. */
3311 ret
= close(client_socket
);
3313 PERROR("close client_socket");
3317 /* update the polling structure to poll on the established socket */
3318 consumer_sockpoll
[1].fd
= sock
;
3319 consumer_sockpoll
[1].events
= POLLIN
| POLLPRI
;
3322 health_code_update();
3324 health_poll_entry();
3325 ret
= lttng_consumer_poll_socket(consumer_sockpoll
);
3334 DBG("Incoming command on sock");
3335 ret
= lttng_consumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
3338 * This could simply be a session daemon quitting. Don't output
3341 DBG("Communication interrupted on command socket");
3345 if (CMM_LOAD_SHARED(consumer_quit
)) {
3346 DBG("consumer_thread_receive_fds received quit from signal");
3347 err
= 0; /* All is OK */
3350 DBG("received command on sock");
3356 DBG("Consumer thread sessiond poll exiting");
3359 * Close metadata streams since the producer is the session daemon which
3362 * NOTE: for now, this only applies to the UST tracer.
3364 lttng_consumer_close_all_metadata();
3367 * when all fds have hung up, the polling thread
3370 CMM_STORE_SHARED(consumer_quit
, 1);
3373 * Notify the data poll thread to poll back again and test the
3374 * consumer_quit state that we just set so to quit gracefully.
3376 notify_thread_lttng_pipe(ctx
->consumer_data_pipe
);
3378 notify_channel_pipe(ctx
, NULL
, -1, CONSUMER_CHANNEL_QUIT
);
3380 notify_health_quit_pipe(health_quit_pipe
);
3382 /* Cleaning up possibly open sockets. */
3386 PERROR("close sock sessiond poll");
3389 if (client_socket
>= 0) {
3390 ret
= close(client_socket
);
3392 PERROR("close client_socket sessiond poll");
3399 ERR("Health error occurred in %s", __func__
);
3401 health_unregister(health_consumerd
);
3403 rcu_unregister_thread();
3407 ssize_t
lttng_consumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
3408 struct lttng_consumer_local_data
*ctx
)
3412 pthread_mutex_lock(&stream
->chan
->lock
);
3413 pthread_mutex_lock(&stream
->lock
);
3414 if (stream
->metadata_flag
) {
3415 pthread_mutex_lock(&stream
->metadata_rdv_lock
);
3418 switch (consumer_data
.type
) {
3419 case LTTNG_CONSUMER_KERNEL
:
3420 ret
= lttng_kconsumer_read_subbuffer(stream
, ctx
);
3422 case LTTNG_CONSUMER32_UST
:
3423 case LTTNG_CONSUMER64_UST
:
3424 ret
= lttng_ustconsumer_read_subbuffer(stream
, ctx
);
3427 ERR("Unknown consumer_data type");
3433 if (stream
->metadata_flag
) {
3434 pthread_cond_broadcast(&stream
->metadata_rdv
);
3435 pthread_mutex_unlock(&stream
->metadata_rdv_lock
);
3437 pthread_mutex_unlock(&stream
->lock
);
3438 pthread_mutex_unlock(&stream
->chan
->lock
);
3443 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream
*stream
)
3445 switch (consumer_data
.type
) {
3446 case LTTNG_CONSUMER_KERNEL
:
3447 return lttng_kconsumer_on_recv_stream(stream
);
3448 case LTTNG_CONSUMER32_UST
:
3449 case LTTNG_CONSUMER64_UST
:
3450 return lttng_ustconsumer_on_recv_stream(stream
);
3452 ERR("Unknown consumer_data type");
3459 * Allocate and set consumer data hash tables.
3461 int lttng_consumer_init(void)
3463 consumer_data
.channel_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3464 if (!consumer_data
.channel_ht
) {
3468 consumer_data
.channels_by_session_id_ht
=
3469 lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3470 if (!consumer_data
.channels_by_session_id_ht
) {
3474 consumer_data
.relayd_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3475 if (!consumer_data
.relayd_ht
) {
3479 consumer_data
.stream_list_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3480 if (!consumer_data
.stream_list_ht
) {
3484 consumer_data
.stream_per_chan_id_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3485 if (!consumer_data
.stream_per_chan_id_ht
) {
3489 data_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3494 metadata_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3499 consumer_data
.chunk_registry
= lttng_trace_chunk_registry_create();
3500 if (!consumer_data
.chunk_registry
) {
3511 * Process the ADD_RELAYD command receive by a consumer.
3513 * This will create a relayd socket pair and add it to the relayd hash table.
3514 * The caller MUST acquire a RCU read side lock before calling it.
3516 void consumer_add_relayd_socket(uint64_t net_seq_idx
, int sock_type
,
3517 struct lttng_consumer_local_data
*ctx
, int sock
,
3518 struct pollfd
*consumer_sockpoll
,
3519 struct lttcomm_relayd_sock
*relayd_sock
, uint64_t sessiond_id
,
3520 uint64_t relayd_session_id
)
3522 int fd
= -1, ret
= -1, relayd_created
= 0;
3523 enum lttcomm_return_code ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
3524 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3527 assert(relayd_sock
);
3529 DBG("Consumer adding relayd socket (idx: %" PRIu64
")", net_seq_idx
);
3531 /* Get relayd reference if exists. */
3532 relayd
= consumer_find_relayd(net_seq_idx
);
3533 if (relayd
== NULL
) {
3534 assert(sock_type
== LTTNG_STREAM_CONTROL
);
3535 /* Not found. Allocate one. */
3536 relayd
= consumer_allocate_relayd_sock_pair(net_seq_idx
);
3537 if (relayd
== NULL
) {
3538 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3541 relayd
->sessiond_session_id
= sessiond_id
;
3546 * This code path MUST continue to the consumer send status message to
3547 * we can notify the session daemon and continue our work without
3548 * killing everything.
3552 * relayd key should never be found for control socket.
3554 assert(sock_type
!= LTTNG_STREAM_CONTROL
);
3557 /* First send a status message before receiving the fds. */
3558 ret
= consumer_send_status_msg(sock
, LTTCOMM_CONSUMERD_SUCCESS
);
3560 /* Somehow, the session daemon is not responding anymore. */
3561 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3562 goto error_nosignal
;
3565 /* Poll on consumer socket. */
3566 ret
= lttng_consumer_poll_socket(consumer_sockpoll
);
3568 /* Needing to exit in the middle of a command: error. */
3569 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
3570 goto error_nosignal
;
3573 /* Get relayd socket from session daemon */
3574 ret
= lttcomm_recv_fds_unix_sock(sock
, &fd
, 1);
3575 if (ret
!= sizeof(fd
)) {
3576 fd
= -1; /* Just in case it gets set with an invalid value. */
3579 * Failing to receive FDs might indicate a major problem such as
3580 * reaching a fd limit during the receive where the kernel returns a
3581 * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we
3582 * don't take any chances and stop everything.
3584 * XXX: Feature request #558 will fix that and avoid this possible
3585 * issue when reaching the fd limit.
3587 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_ERROR_RECV_FD
);
3588 ret_code
= LTTCOMM_CONSUMERD_ERROR_RECV_FD
;
3592 /* Copy socket information and received FD */
3593 switch (sock_type
) {
3594 case LTTNG_STREAM_CONTROL
:
3595 /* Copy received lttcomm socket */
3596 lttcomm_copy_sock(&relayd
->control_sock
.sock
, &relayd_sock
->sock
);
3597 ret
= lttcomm_create_sock(&relayd
->control_sock
.sock
);
3598 /* Handle create_sock error. */
3600 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3604 * Close the socket created internally by
3605 * lttcomm_create_sock, so we can replace it by the one
3606 * received from sessiond.
3608 if (close(relayd
->control_sock
.sock
.fd
)) {
3612 /* Assign new file descriptor */
3613 relayd
->control_sock
.sock
.fd
= fd
;
3614 /* Assign version values. */
3615 relayd
->control_sock
.major
= relayd_sock
->major
;
3616 relayd
->control_sock
.minor
= relayd_sock
->minor
;
3618 relayd
->relayd_session_id
= relayd_session_id
;
3621 case LTTNG_STREAM_DATA
:
3622 /* Copy received lttcomm socket */
3623 lttcomm_copy_sock(&relayd
->data_sock
.sock
, &relayd_sock
->sock
);
3624 ret
= lttcomm_create_sock(&relayd
->data_sock
.sock
);
3625 /* Handle create_sock error. */
3627 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3631 * Close the socket created internally by
3632 * lttcomm_create_sock, so we can replace it by the one
3633 * received from sessiond.
3635 if (close(relayd
->data_sock
.sock
.fd
)) {
3639 /* Assign new file descriptor */
3640 relayd
->data_sock
.sock
.fd
= fd
;
3641 /* Assign version values. */
3642 relayd
->data_sock
.major
= relayd_sock
->major
;
3643 relayd
->data_sock
.minor
= relayd_sock
->minor
;
3646 ERR("Unknown relayd socket type (%d)", sock_type
);
3647 ret_code
= LTTCOMM_CONSUMERD_FATAL
;
3651 DBG("Consumer %s socket created successfully with net idx %" PRIu64
" (fd: %d)",
3652 sock_type
== LTTNG_STREAM_CONTROL
? "control" : "data",
3653 relayd
->net_seq_idx
, fd
);
3655 * We gave the ownership of the fd to the relayd structure. Set the
3656 * fd to -1 so we don't call close() on it in the error path below.
3660 /* We successfully added the socket. Send status back. */
3661 ret
= consumer_send_status_msg(sock
, ret_code
);
3663 /* Somehow, the session daemon is not responding anymore. */
3664 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3665 goto error_nosignal
;
3669 * Add relayd socket pair to consumer data hashtable. If object already
3670 * exists or on error, the function gracefully returns.
3679 if (consumer_send_status_msg(sock
, ret_code
) < 0) {
3680 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3684 /* Close received socket if valid. */
3687 PERROR("close received socket");
3691 if (relayd_created
) {
3697 * Search for a relayd associated to the session id and return the reference.
3699 * A rcu read side lock MUST be acquire before calling this function and locked
3700 * until the relayd object is no longer necessary.
3702 static struct consumer_relayd_sock_pair
*find_relayd_by_session_id(uint64_t id
)
3704 struct lttng_ht_iter iter
;
3705 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3707 /* Iterate over all relayd since they are indexed by net_seq_idx. */
3708 cds_lfht_for_each_entry(consumer_data
.relayd_ht
->ht
, &iter
.iter
, relayd
,
3711 * Check by sessiond id which is unique here where the relayd session
3712 * id might not be when having multiple relayd.
3714 if (relayd
->sessiond_session_id
== id
) {
3715 /* Found the relayd. There can be only one per id. */
3727 * Check if for a given session id there is still data needed to be extract
3730 * Return 1 if data is pending or else 0 meaning ready to be read.
3732 int consumer_data_pending(uint64_t id
)
3735 struct lttng_ht_iter iter
;
3736 struct lttng_ht
*ht
;
3737 struct lttng_consumer_stream
*stream
;
3738 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3739 int (*data_pending
)(struct lttng_consumer_stream
*);
3741 DBG("Consumer data pending command on session id %" PRIu64
, id
);
3744 pthread_mutex_lock(&consumer_data
.lock
);
3746 switch (consumer_data
.type
) {
3747 case LTTNG_CONSUMER_KERNEL
:
3748 data_pending
= lttng_kconsumer_data_pending
;
3750 case LTTNG_CONSUMER32_UST
:
3751 case LTTNG_CONSUMER64_UST
:
3752 data_pending
= lttng_ustconsumer_data_pending
;
3755 ERR("Unknown consumer data type");
3759 /* Ease our life a bit */
3760 ht
= consumer_data
.stream_list_ht
;
3762 cds_lfht_for_each_entry_duplicate(ht
->ht
,
3763 ht
->hash_fct(&id
, lttng_ht_seed
),
3765 &iter
.iter
, stream
, node_session_id
.node
) {
3766 pthread_mutex_lock(&stream
->lock
);
3769 * A removed node from the hash table indicates that the stream has
3770 * been deleted thus having a guarantee that the buffers are closed
3771 * on the consumer side. However, data can still be transmitted
3772 * over the network so don't skip the relayd check.
3774 ret
= cds_lfht_is_node_deleted(&stream
->node
.node
);
3776 /* Check the stream if there is data in the buffers. */
3777 ret
= data_pending(stream
);
3779 pthread_mutex_unlock(&stream
->lock
);
3784 pthread_mutex_unlock(&stream
->lock
);
3787 relayd
= find_relayd_by_session_id(id
);
3789 unsigned int is_data_inflight
= 0;
3791 /* Send init command for data pending. */
3792 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3793 ret
= relayd_begin_data_pending(&relayd
->control_sock
,
3794 relayd
->relayd_session_id
);
3796 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3797 /* Communication error thus the relayd so no data pending. */
3798 goto data_not_pending
;
3801 cds_lfht_for_each_entry_duplicate(ht
->ht
,
3802 ht
->hash_fct(&id
, lttng_ht_seed
),
3804 &iter
.iter
, stream
, node_session_id
.node
) {
3805 if (stream
->metadata_flag
) {
3806 ret
= relayd_quiescent_control(&relayd
->control_sock
,
3807 stream
->relayd_stream_id
);
3809 ret
= relayd_data_pending(&relayd
->control_sock
,
3810 stream
->relayd_stream_id
,
3811 stream
->next_net_seq_num
- 1);
3815 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3817 } else if (ret
< 0) {
3818 ERR("Relayd data pending failed. Cleaning up relayd %" PRIu64
".", relayd
->net_seq_idx
);
3819 lttng_consumer_cleanup_relayd(relayd
);
3820 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3821 goto data_not_pending
;
3825 /* Send end command for data pending. */
3826 ret
= relayd_end_data_pending(&relayd
->control_sock
,
3827 relayd
->relayd_session_id
, &is_data_inflight
);
3828 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3830 ERR("Relayd end data pending failed. Cleaning up relayd %" PRIu64
".", relayd
->net_seq_idx
);
3831 lttng_consumer_cleanup_relayd(relayd
);
3832 goto data_not_pending
;
3834 if (is_data_inflight
) {
3840 * Finding _no_ node in the hash table and no inflight data means that the
3841 * stream(s) have been removed thus data is guaranteed to be available for
3842 * analysis from the trace files.
3846 /* Data is available to be read by a viewer. */
3847 pthread_mutex_unlock(&consumer_data
.lock
);
3852 /* Data is still being extracted from buffers. */
3853 pthread_mutex_unlock(&consumer_data
.lock
);
3859 * Send a ret code status message to the sessiond daemon.
3861 * Return the sendmsg() return value.
3863 int consumer_send_status_msg(int sock
, int ret_code
)
3865 struct lttcomm_consumer_status_msg msg
;
3867 memset(&msg
, 0, sizeof(msg
));
3868 msg
.ret_code
= ret_code
;
3870 return lttcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
3874 * Send a channel status message to the sessiond daemon.
3876 * Return the sendmsg() return value.
3878 int consumer_send_status_channel(int sock
,
3879 struct lttng_consumer_channel
*channel
)
3881 struct lttcomm_consumer_status_channel msg
;
3885 memset(&msg
, 0, sizeof(msg
));
3887 msg
.ret_code
= LTTCOMM_CONSUMERD_CHANNEL_FAIL
;
3889 msg
.ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
3890 msg
.key
= channel
->key
;
3891 msg
.stream_count
= channel
->streams
.count
;
3894 return lttcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
3897 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos
,
3898 unsigned long produced_pos
, uint64_t nb_packets_per_stream
,
3899 uint64_t max_sb_size
)
3901 unsigned long start_pos
;
3903 if (!nb_packets_per_stream
) {
3904 return consumed_pos
; /* Grab everything */
3906 start_pos
= produced_pos
- offset_align_floor(produced_pos
, max_sb_size
);
3907 start_pos
-= max_sb_size
* nb_packets_per_stream
;
3908 if ((long) (start_pos
- consumed_pos
) < 0) {
3909 return consumed_pos
; /* Grab everything */
3915 int consumer_flush_buffer(struct lttng_consumer_stream
*stream
, int producer_active
)
3919 switch (consumer_data
.type
) {
3920 case LTTNG_CONSUMER_KERNEL
:
3921 if (producer_active
) {
3922 ret
= kernctl_buffer_flush(stream
->wait_fd
);
3924 ERR("Failed to flush kernel stream");
3928 ret
= kernctl_buffer_flush_empty(stream
->wait_fd
);
3930 ERR("Failed to flush kernel stream");
3935 case LTTNG_CONSUMER32_UST
:
3936 case LTTNG_CONSUMER64_UST
:
3937 lttng_ustconsumer_flush_buffer(stream
, producer_active
);
3940 ERR("Unknown consumer_data type");
3949 * Sample the rotate position for all the streams of a channel. If a stream
3950 * is already at the rotate position (produced == consumed), we flag it as
3951 * ready for rotation. The rotation of ready streams occurs after we have
3952 * replied to the session daemon that we have finished sampling the positions.
3953 * Must be called with RCU read-side lock held to ensure existence of channel.
3955 * Returns 0 on success, < 0 on error
3957 int lttng_consumer_rotate_channel(struct lttng_consumer_channel
*channel
,
3958 uint64_t key
, uint64_t relayd_id
, uint32_t metadata
,
3959 struct lttng_consumer_local_data
*ctx
)
3962 struct lttng_consumer_stream
*stream
;
3963 struct lttng_ht_iter iter
;
3964 struct lttng_ht
*ht
= consumer_data
.stream_per_chan_id_ht
;
3965 struct lttng_dynamic_array stream_rotation_positions
;
3966 uint64_t next_chunk_id
, stream_count
= 0;
3967 enum lttng_trace_chunk_status chunk_status
;
3968 const bool is_local_trace
= relayd_id
== -1ULL;
3969 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3970 bool rotating_to_new_chunk
= true;
3972 DBG("Consumer sample rotate position for channel %" PRIu64
, key
);
3974 lttng_dynamic_array_init(&stream_rotation_positions
,
3975 sizeof(struct relayd_stream_rotation_position
), NULL
);
3979 pthread_mutex_lock(&channel
->lock
);
3980 assert(channel
->trace_chunk
);
3981 chunk_status
= lttng_trace_chunk_get_id(channel
->trace_chunk
,
3983 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
3985 goto end_unlock_channel
;
3988 cds_lfht_for_each_entry_duplicate(ht
->ht
,
3989 ht
->hash_fct(&channel
->key
, lttng_ht_seed
),
3990 ht
->match_fct
, &channel
->key
, &iter
.iter
,
3991 stream
, node_channel_id
.node
) {
3992 unsigned long produced_pos
= 0, consumed_pos
= 0;
3994 health_code_update();
3997 * Lock stream because we are about to change its state.
3999 pthread_mutex_lock(&stream
->lock
);
4001 if (stream
->trace_chunk
== stream
->chan
->trace_chunk
) {
4002 rotating_to_new_chunk
= false;
4006 * Do not flush an empty packet when rotating from a NULL trace
4007 * chunk. The stream has no means to output data, and the prior
4008 * rotation which rotated to NULL performed that side-effect already.
4010 if (stream
->trace_chunk
) {
4012 * For metadata stream, do an active flush, which does not
4013 * produce empty packets. For data streams, empty-flush;
4014 * ensures we have at least one packet in each stream per trace
4015 * chunk, even if no data was produced.
4017 ret
= consumer_flush_buffer(stream
, stream
->metadata_flag
? 1 : 0);
4019 ERR("Failed to flush stream %" PRIu64
" during channel rotation",
4021 goto end_unlock_stream
;
4025 ret
= lttng_consumer_take_snapshot(stream
);
4026 if (ret
< 0 && ret
!= -ENODATA
&& ret
!= -EAGAIN
) {
4027 ERR("Failed to sample snapshot position during channel rotation");
4028 goto end_unlock_stream
;
4031 ret
= lttng_consumer_get_produced_snapshot(stream
,
4034 ERR("Failed to sample produced position during channel rotation");
4035 goto end_unlock_stream
;
4038 ret
= lttng_consumer_get_consumed_snapshot(stream
,
4041 ERR("Failed to sample consumed position during channel rotation");
4042 goto end_unlock_stream
;
4046 * Align produced position on the start-of-packet boundary of the first
4047 * packet going into the next trace chunk.
4049 produced_pos
= ALIGN_FLOOR(produced_pos
, stream
->max_sb_size
);
4050 if (consumed_pos
== produced_pos
) {
4051 stream
->rotate_ready
= true;
4054 * The rotation position is based on the packet_seq_num of the
4055 * packet following the last packet that was consumed for this
4056 * stream, incremented by the offset between produced and
4057 * consumed positions. This rotation position is a lower bound
4058 * (inclusive) at which the next trace chunk starts. Since it
4059 * is a lower bound, it is OK if the packet_seq_num does not
4060 * correspond exactly to the same packet identified by the
4061 * consumed_pos, which can happen in overwrite mode.
4063 if (stream
->sequence_number_unavailable
) {
4065 * Rotation should never be performed on a session which
4066 * interacts with a pre-2.8 lttng-modules, which does
4067 * not implement packet sequence number.
4069 ERR("Failure to rotate stream %" PRIu64
": sequence number unavailable",
4072 goto end_unlock_stream
;
4074 stream
->rotate_position
= stream
->last_sequence_number
+ 1 +
4075 ((produced_pos
- consumed_pos
) / stream
->max_sb_size
);
4077 if (!is_local_trace
) {
4079 * The relay daemon control protocol expects a rotation
4080 * position as "the sequence number of the first packet
4081 * _after_ the current trace chunk".
4083 const struct relayd_stream_rotation_position position
= {
4084 .stream_id
= stream
->relayd_stream_id
,
4085 .rotate_at_seq_num
= stream
->rotate_position
,
4088 ret
= lttng_dynamic_array_add_element(
4089 &stream_rotation_positions
,
4092 ERR("Failed to allocate stream rotation position");
4093 goto end_unlock_stream
;
4097 pthread_mutex_unlock(&stream
->lock
);
4100 pthread_mutex_unlock(&channel
->lock
);
4102 if (is_local_trace
) {
4107 relayd
= consumer_find_relayd(relayd_id
);
4109 ERR("Failed to find relayd %" PRIu64
, relayd_id
);
4114 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
4115 ret
= relayd_rotate_streams(&relayd
->control_sock
, stream_count
,
4116 rotating_to_new_chunk
? &next_chunk_id
: NULL
,
4117 (const struct relayd_stream_rotation_position
*)
4118 stream_rotation_positions
.buffer
.data
);
4119 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
4121 ERR("Relayd rotate stream failed. Cleaning up relayd %" PRIu64
,
4122 relayd
->net_seq_idx
);
4123 lttng_consumer_cleanup_relayd(relayd
);
4131 pthread_mutex_unlock(&stream
->lock
);
4133 pthread_mutex_unlock(&channel
->lock
);
4136 lttng_dynamic_array_reset(&stream_rotation_positions
);
4141 * Check if a stream is ready to be rotated after extracting it.
4143 * Return 1 if it is ready for rotation, 0 if it is not, a negative value on
4144 * error. Stream lock must be held.
4146 int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream
*stream
)
4148 if (stream
->rotate_ready
) {
4153 * If packet seq num is unavailable, it means we are interacting
4154 * with a pre-2.8 lttng-modules which does not implement the
4155 * sequence number. Rotation should never be used by sessiond in this
4158 if (stream
->sequence_number_unavailable
) {
4159 ERR("Internal error: rotation used on stream %" PRIu64
4160 " with unavailable sequence number",
4165 if (stream
->rotate_position
== -1ULL ||
4166 stream
->last_sequence_number
== -1ULL) {
4171 * Rotate position not reached yet. The stream rotate position is
4172 * the position of the next packet belonging to the next trace chunk,
4173 * but consumerd considers rotation ready when reaching the last
4174 * packet of the current chunk, hence the "rotate_position - 1".
4176 if (stream
->last_sequence_number
>= stream
->rotate_position
- 1) {
4184 * Reset the state for a stream after a rotation occurred.
4186 void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream
*stream
)
4188 stream
->rotate_position
= -1ULL;
4189 stream
->rotate_ready
= false;
4193 * Perform the rotation a local stream file.
4196 int rotate_local_stream(struct lttng_consumer_local_data
*ctx
,
4197 struct lttng_consumer_stream
*stream
)
4201 DBG("Rotate local stream: stream key %" PRIu64
", channel key %" PRIu64
,
4204 stream
->tracefile_size_current
= 0;
4205 stream
->tracefile_count_current
= 0;
4207 if (stream
->out_fd
>= 0) {
4208 ret
= close(stream
->out_fd
);
4210 PERROR("Failed to close stream out_fd of channel \"%s\"",
4211 stream
->chan
->name
);
4213 stream
->out_fd
= -1;
4216 if (stream
->index_file
) {
4217 lttng_index_file_put(stream
->index_file
);
4218 stream
->index_file
= NULL
;
4221 if (!stream
->trace_chunk
) {
4225 ret
= consumer_stream_create_output_files(stream
, true);
4231 * Performs the stream rotation for the rotate session feature if needed.
4232 * It must be called with the channel and stream locks held.
4234 * Return 0 on success, a negative number of error.
4236 int lttng_consumer_rotate_stream(struct lttng_consumer_local_data
*ctx
,
4237 struct lttng_consumer_stream
*stream
)
4241 DBG("Consumer rotate stream %" PRIu64
, stream
->key
);
4244 * Update the stream's 'current' chunk to the session's (channel)
4245 * now-current chunk.
4247 lttng_trace_chunk_put(stream
->trace_chunk
);
4248 if (stream
->chan
->trace_chunk
== stream
->trace_chunk
) {
4250 * A channel can be rotated and not have a "next" chunk
4251 * to transition to. In that case, the channel's "current chunk"
4252 * has not been closed yet, but it has not been updated to
4253 * a "next" trace chunk either. Hence, the stream, like its
4254 * parent channel, becomes part of no chunk and can't output
4255 * anything until a new trace chunk is created.
4257 stream
->trace_chunk
= NULL
;
4258 } else if (stream
->chan
->trace_chunk
&&
4259 !lttng_trace_chunk_get(stream
->chan
->trace_chunk
)) {
4260 ERR("Failed to acquire a reference to channel's trace chunk during stream rotation");
4265 * Update the stream's trace chunk to its parent channel's
4266 * current trace chunk.
4268 stream
->trace_chunk
= stream
->chan
->trace_chunk
;
4271 if (stream
->net_seq_idx
== (uint64_t) -1ULL) {
4272 ret
= rotate_local_stream(ctx
, stream
);
4274 ERR("Failed to rotate stream, ret = %i", ret
);
4279 if (stream
->metadata_flag
&& stream
->trace_chunk
) {
4281 * If the stream has transitioned to a new trace
4282 * chunk, the metadata should be re-dumped to the
4285 * However, it is possible for a stream to transition to
4286 * a "no-chunk" state. This can happen if a rotation
4287 * occurs on an inactive session. In such cases, the metadata
4288 * regeneration will happen when the next trace chunk is
4291 ret
= consumer_metadata_stream_dump(stream
);
4296 lttng_consumer_reset_stream_rotate_state(stream
);
4305 * Rotate all the ready streams now.
4307 * This is especially important for low throughput streams that have already
4308 * been consumed, we cannot wait for their next packet to perform the
4310 * Need to be called with RCU read-side lock held to ensure existence of
4313 * Returns 0 on success, < 0 on error
4315 int lttng_consumer_rotate_ready_streams(struct lttng_consumer_channel
*channel
,
4316 uint64_t key
, struct lttng_consumer_local_data
*ctx
)
4319 struct lttng_consumer_stream
*stream
;
4320 struct lttng_ht_iter iter
;
4321 struct lttng_ht
*ht
= consumer_data
.stream_per_chan_id_ht
;
4325 DBG("Consumer rotate ready streams in channel %" PRIu64
, key
);
4327 cds_lfht_for_each_entry_duplicate(ht
->ht
,
4328 ht
->hash_fct(&channel
->key
, lttng_ht_seed
),
4329 ht
->match_fct
, &channel
->key
, &iter
.iter
,
4330 stream
, node_channel_id
.node
) {
4331 health_code_update();
4333 pthread_mutex_lock(&stream
->chan
->lock
);
4334 pthread_mutex_lock(&stream
->lock
);
4336 if (!stream
->rotate_ready
) {
4337 pthread_mutex_unlock(&stream
->lock
);
4338 pthread_mutex_unlock(&stream
->chan
->lock
);
4341 DBG("Consumer rotate ready stream %" PRIu64
, stream
->key
);
4343 ret
= lttng_consumer_rotate_stream(ctx
, stream
);
4344 pthread_mutex_unlock(&stream
->lock
);
4345 pthread_mutex_unlock(&stream
->chan
->lock
);
4358 enum lttcomm_return_code
lttng_consumer_init_command(
4359 struct lttng_consumer_local_data
*ctx
,
4360 const lttng_uuid sessiond_uuid
)
4362 enum lttcomm_return_code ret
;
4363 char uuid_str
[UUID_STR_LEN
];
4365 if (ctx
->sessiond_uuid
.is_set
) {
4366 ret
= LTTCOMM_CONSUMERD_ALREADY_SET
;
4370 ctx
->sessiond_uuid
.is_set
= true;
4371 memcpy(ctx
->sessiond_uuid
.value
, sessiond_uuid
, sizeof(lttng_uuid
));
4372 ret
= LTTCOMM_CONSUMERD_SUCCESS
;
4373 lttng_uuid_to_str(sessiond_uuid
, uuid_str
);
4374 DBG("Received session daemon UUID: %s", uuid_str
);
4379 enum lttcomm_return_code
lttng_consumer_create_trace_chunk(
4380 const uint64_t *relayd_id
, uint64_t session_id
,
4382 time_t chunk_creation_timestamp
,
4383 const char *chunk_override_name
,
4384 const struct lttng_credentials
*credentials
,
4385 struct lttng_directory_handle
*chunk_directory_handle
)
4388 enum lttcomm_return_code ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
4389 struct lttng_trace_chunk
*created_chunk
= NULL
, *published_chunk
= NULL
;
4390 enum lttng_trace_chunk_status chunk_status
;
4391 char relayd_id_buffer
[MAX_INT_DEC_LEN(*relayd_id
)];
4392 char creation_timestamp_buffer
[ISO8601_STR_LEN
];
4393 const char *relayd_id_str
= "(none)";
4394 const char *creation_timestamp_str
;
4395 struct lttng_ht_iter iter
;
4396 struct lttng_consumer_channel
*channel
;
4399 /* Only used for logging purposes. */
4400 ret
= snprintf(relayd_id_buffer
, sizeof(relayd_id_buffer
),
4401 "%" PRIu64
, *relayd_id
);
4402 if (ret
> 0 && ret
< sizeof(relayd_id_buffer
)) {
4403 relayd_id_str
= relayd_id_buffer
;
4405 relayd_id_str
= "(formatting error)";
4409 /* Local protocol error. */
4410 assert(chunk_creation_timestamp
);
4411 ret
= time_to_iso8601_str(chunk_creation_timestamp
,
4412 creation_timestamp_buffer
,
4413 sizeof(creation_timestamp_buffer
));
4414 creation_timestamp_str
= !ret
? creation_timestamp_buffer
:
4415 "(formatting error)";
4417 DBG("Consumer create trace chunk command: relay_id = %s"
4418 ", session_id = %" PRIu64
", chunk_id = %" PRIu64
4419 ", chunk_override_name = %s"
4420 ", chunk_creation_timestamp = %s",
4421 relayd_id_str
, session_id
, chunk_id
,
4422 chunk_override_name
? : "(none)",
4423 creation_timestamp_str
);
4426 * The trace chunk registry, as used by the consumer daemon, implicitly
4427 * owns the trace chunks. This is only needed in the consumer since
4428 * the consumer has no notion of a session beyond session IDs being
4429 * used to identify other objects.
4431 * The lttng_trace_chunk_registry_publish() call below provides a
4432 * reference which is not released; it implicitly becomes the session
4433 * daemon's reference to the chunk in the consumer daemon.
4435 * The lifetime of trace chunks in the consumer daemon is managed by
4436 * the session daemon through the LTTNG_CONSUMER_CREATE_TRACE_CHUNK
4437 * and LTTNG_CONSUMER_DESTROY_TRACE_CHUNK commands.
4439 created_chunk
= lttng_trace_chunk_create(chunk_id
,
4440 chunk_creation_timestamp
);
4441 if (!created_chunk
) {
4442 ERR("Failed to create trace chunk");
4443 ret_code
= LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED
;
4447 if (chunk_override_name
) {
4448 chunk_status
= lttng_trace_chunk_override_name(created_chunk
,
4449 chunk_override_name
);
4450 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
4451 ret_code
= LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED
;
4456 if (chunk_directory_handle
) {
4457 chunk_status
= lttng_trace_chunk_set_credentials(created_chunk
,
4459 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
4460 ERR("Failed to set trace chunk credentials");
4461 ret_code
= LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED
;
4465 * The consumer daemon has no ownership of the chunk output
4468 chunk_status
= lttng_trace_chunk_set_as_user(created_chunk
,
4469 chunk_directory_handle
);
4470 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
4471 ERR("Failed to set trace chunk's directory handle");
4472 ret_code
= LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED
;
4477 published_chunk
= lttng_trace_chunk_registry_publish_chunk(
4478 consumer_data
.chunk_registry
, session_id
,
4480 lttng_trace_chunk_put(created_chunk
);
4481 created_chunk
= NULL
;
4482 if (!published_chunk
) {
4483 ERR("Failed to publish trace chunk");
4484 ret_code
= LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED
;
4489 cds_lfht_for_each_entry_duplicate(consumer_data
.channels_by_session_id_ht
->ht
,
4490 consumer_data
.channels_by_session_id_ht
->hash_fct(
4491 &session_id
, lttng_ht_seed
),
4492 consumer_data
.channels_by_session_id_ht
->match_fct
,
4493 &session_id
, &iter
.iter
, channel
,
4494 channels_by_session_id_ht_node
.node
) {
4495 ret
= lttng_consumer_channel_set_trace_chunk(channel
,
4499 * Roll-back the creation of this chunk.
4501 * This is important since the session daemon will
4502 * assume that the creation of this chunk failed and
4503 * will never ask for it to be closed, resulting
4504 * in a leak and an inconsistent state for some
4507 enum lttcomm_return_code close_ret
;
4508 char path
[LTTNG_PATH_MAX
];
4510 DBG("Failed to set new trace chunk on existing channels, rolling back");
4511 close_ret
= lttng_consumer_close_trace_chunk(relayd_id
,
4512 session_id
, chunk_id
,
4513 chunk_creation_timestamp
, NULL
,
4515 if (close_ret
!= LTTCOMM_CONSUMERD_SUCCESS
) {
4516 ERR("Failed to roll-back the creation of new chunk: session_id = %" PRIu64
", chunk_id = %" PRIu64
,
4517 session_id
, chunk_id
);
4520 ret_code
= LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED
;
4526 struct consumer_relayd_sock_pair
*relayd
;
4528 relayd
= consumer_find_relayd(*relayd_id
);
4530 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
4531 ret
= relayd_create_trace_chunk(
4532 &relayd
->control_sock
, published_chunk
);
4533 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
4535 ERR("Failed to find relay daemon socket: relayd_id = %" PRIu64
, *relayd_id
);
4538 if (!relayd
|| ret
) {
4539 enum lttcomm_return_code close_ret
;
4540 char path
[LTTNG_PATH_MAX
];
4542 close_ret
= lttng_consumer_close_trace_chunk(relayd_id
,
4545 chunk_creation_timestamp
,
4547 if (close_ret
!= LTTCOMM_CONSUMERD_SUCCESS
) {
4548 ERR("Failed to roll-back the creation of new chunk: session_id = %" PRIu64
", chunk_id = %" PRIu64
,
4553 ret_code
= LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED
;
4560 /* Release the reference returned by the "publish" operation. */
4561 lttng_trace_chunk_put(published_chunk
);
4562 lttng_trace_chunk_put(created_chunk
);
4566 enum lttcomm_return_code
lttng_consumer_close_trace_chunk(
4567 const uint64_t *relayd_id
, uint64_t session_id
,
4568 uint64_t chunk_id
, time_t chunk_close_timestamp
,
4569 const enum lttng_trace_chunk_command_type
*close_command
,
4572 enum lttcomm_return_code ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
4573 struct lttng_trace_chunk
*chunk
;
4574 char relayd_id_buffer
[MAX_INT_DEC_LEN(*relayd_id
)];
4575 const char *relayd_id_str
= "(none)";
4576 const char *close_command_name
= "none";
4577 struct lttng_ht_iter iter
;
4578 struct lttng_consumer_channel
*channel
;
4579 enum lttng_trace_chunk_status chunk_status
;
4584 /* Only used for logging purposes. */
4585 ret
= snprintf(relayd_id_buffer
, sizeof(relayd_id_buffer
),
4586 "%" PRIu64
, *relayd_id
);
4587 if (ret
> 0 && ret
< sizeof(relayd_id_buffer
)) {
4588 relayd_id_str
= relayd_id_buffer
;
4590 relayd_id_str
= "(formatting error)";
4593 if (close_command
) {
4594 close_command_name
= lttng_trace_chunk_command_type_get_name(
4598 DBG("Consumer close trace chunk command: relayd_id = %s"
4599 ", session_id = %" PRIu64
", chunk_id = %" PRIu64
4600 ", close command = %s",
4601 relayd_id_str
, session_id
, chunk_id
,
4602 close_command_name
);
4604 chunk
= lttng_trace_chunk_registry_find_chunk(
4605 consumer_data
.chunk_registry
, session_id
, chunk_id
);
4607 ERR("Failed to find chunk: session_id = %" PRIu64
4608 ", chunk_id = %" PRIu64
,
4609 session_id
, chunk_id
);
4610 ret_code
= LTTCOMM_CONSUMERD_UNKNOWN_TRACE_CHUNK
;
4614 chunk_status
= lttng_trace_chunk_set_close_timestamp(chunk
,
4615 chunk_close_timestamp
);
4616 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
4617 ret_code
= LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED
;
4621 if (close_command
) {
4622 chunk_status
= lttng_trace_chunk_set_close_command(
4623 chunk
, *close_command
);
4624 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
4625 ret_code
= LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED
;
4631 * chunk is now invalid to access as we no longer hold a reference to
4632 * it; it is only kept around to compare it (by address) to the
4633 * current chunk found in the session's channels.
4636 cds_lfht_for_each_entry(consumer_data
.channel_ht
->ht
, &iter
.iter
,
4637 channel
, node
.node
) {
4641 * Only change the channel's chunk to NULL if it still
4642 * references the chunk being closed. The channel may
4643 * reference a newer channel in the case of a session
4644 * rotation. When a session rotation occurs, the "next"
4645 * chunk is created before the "current" chunk is closed.
4647 if (channel
->trace_chunk
!= chunk
) {
4650 ret
= lttng_consumer_channel_set_trace_chunk(channel
, NULL
);
4653 * Attempt to close the chunk on as many channels as
4656 ret_code
= LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED
;
4662 struct consumer_relayd_sock_pair
*relayd
;
4664 relayd
= consumer_find_relayd(*relayd_id
);
4666 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
4667 ret
= relayd_close_trace_chunk(
4668 &relayd
->control_sock
, chunk
,
4670 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
4672 ERR("Failed to find relay daemon socket: relayd_id = %" PRIu64
,
4676 if (!relayd
|| ret
) {
4677 ret_code
= LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED
;
4685 * Release the reference returned by the "find" operation and
4686 * the session daemon's implicit reference to the chunk.
4688 lttng_trace_chunk_put(chunk
);
4689 lttng_trace_chunk_put(chunk
);
4694 enum lttcomm_return_code
lttng_consumer_trace_chunk_exists(
4695 const uint64_t *relayd_id
, uint64_t session_id
,
4699 enum lttcomm_return_code ret_code
;
4700 char relayd_id_buffer
[MAX_INT_DEC_LEN(*relayd_id
)];
4701 const char *relayd_id_str
= "(none)";
4702 const bool is_local_trace
= !relayd_id
;
4703 struct consumer_relayd_sock_pair
*relayd
= NULL
;
4704 bool chunk_exists_local
, chunk_exists_remote
;
4709 /* Only used for logging purposes. */
4710 ret
= snprintf(relayd_id_buffer
, sizeof(relayd_id_buffer
),
4711 "%" PRIu64
, *relayd_id
);
4712 if (ret
> 0 && ret
< sizeof(relayd_id_buffer
)) {
4713 relayd_id_str
= relayd_id_buffer
;
4715 relayd_id_str
= "(formatting error)";
4719 DBG("Consumer trace chunk exists command: relayd_id = %s"
4720 ", chunk_id = %" PRIu64
, relayd_id_str
,
4722 ret
= lttng_trace_chunk_registry_chunk_exists(
4723 consumer_data
.chunk_registry
, session_id
,
4724 chunk_id
, &chunk_exists_local
);
4726 /* Internal error. */
4727 ERR("Failed to query the existence of a trace chunk");
4728 ret_code
= LTTCOMM_CONSUMERD_FATAL
;
4731 DBG("Trace chunk %s locally",
4732 chunk_exists_local
? "exists" : "does not exist");
4733 if (chunk_exists_local
) {
4734 ret_code
= LTTCOMM_CONSUMERD_TRACE_CHUNK_EXISTS_LOCAL
;
4736 } else if (is_local_trace
) {
4737 ret_code
= LTTCOMM_CONSUMERD_UNKNOWN_TRACE_CHUNK
;
4742 relayd
= consumer_find_relayd(*relayd_id
);
4744 ERR("Failed to find relayd %" PRIu64
, *relayd_id
);
4745 ret_code
= LTTCOMM_CONSUMERD_INVALID_PARAMETERS
;
4746 goto end_rcu_unlock
;
4748 DBG("Looking up existence of trace chunk on relay daemon");
4749 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
4750 ret
= relayd_trace_chunk_exists(&relayd
->control_sock
, chunk_id
,
4751 &chunk_exists_remote
);
4752 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
4754 ERR("Failed to look-up the existence of trace chunk on relay daemon");
4755 ret_code
= LTTCOMM_CONSUMERD_RELAYD_FAIL
;
4756 goto end_rcu_unlock
;
4759 ret_code
= chunk_exists_remote
?
4760 LTTCOMM_CONSUMERD_TRACE_CHUNK_EXISTS_REMOTE
:
4761 LTTCOMM_CONSUMERD_UNKNOWN_TRACE_CHUNK
;
4762 DBG("Trace chunk %s on relay daemon",
4763 chunk_exists_remote
? "exists" : "does not exist");