2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include <common/common.h>
27 #include <common/defaults.h>
29 #include "buffer-registry.h"
30 #include "trace-ust.h"
36 * Match function for the events hash table lookup.
38 * Matches by name only. Used by the disable command.
40 int trace_ust_ht_match_event_by_name(struct cds_lfht_node
*node
,
43 struct ltt_ust_event
*event
;
49 event
= caa_container_of(node
, struct ltt_ust_event
, node
.node
);
53 if (strncmp(event
->attr
.name
, name
, sizeof(event
->attr
.name
)) != 0) {
65 * Match function for the hash table lookup.
67 * It matches an ust event based on three attributes which are the event name,
68 * the filter bytecode and the loglevel.
70 int trace_ust_ht_match_event(struct cds_lfht_node
*node
, const void *_key
)
72 struct ltt_ust_event
*event
;
73 const struct ltt_ust_ht_key
*key
;
74 int ev_loglevel_value
;
79 event
= caa_container_of(node
, struct ltt_ust_event
, node
.node
);
81 ev_loglevel_value
= event
->attr
.loglevel
;
83 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
86 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
90 /* Event loglevel value and type. */
91 if (event
->attr
.loglevel_type
== key
->loglevel_type
) {
92 /* Same loglevel type. */
93 if (key
->loglevel_type
!= LTTNG_UST_LOGLEVEL_ALL
) {
95 * Loglevel value must also match since the loglevel
98 if (ev_loglevel_value
!= key
->loglevel_value
) {
103 /* Loglevel type is different: no match. */
107 /* Only one of the filters is NULL, fail. */
108 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
112 if (key
->filter
&& event
->filter
) {
113 /* Both filters exists, check length followed by the bytecode. */
114 if (event
->filter
->len
!= key
->filter
->len
||
115 memcmp(event
->filter
->data
, key
->filter
->data
,
116 event
->filter
->len
) != 0) {
121 /* If only one of the exclusions is NULL, fail. */
122 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
126 if (key
->exclusion
&& event
->exclusion
) {
127 /* Both exclusions exist; check count followed by names. */
128 if (event
->exclusion
->count
!= key
->exclusion
->count
||
129 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
130 event
->exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
) != 0) {
142 * Find the channel in the hashtable and return channel pointer. RCU read side
143 * lock MUST be acquired before calling this.
145 struct ltt_ust_channel
*trace_ust_find_channel_by_name(struct lttng_ht
*ht
,
148 struct lttng_ht_node_str
*node
;
149 struct lttng_ht_iter iter
;
152 * If we receive an empty string for channel name, it means the
153 * default channel name is requested.
156 name
= DEFAULT_CHANNEL_NAME
;
158 lttng_ht_lookup(ht
, (void *)name
, &iter
);
159 node
= lttng_ht_iter_get_node_str(&iter
);
164 DBG2("Trace UST channel %s found by name", name
);
166 return caa_container_of(node
, struct ltt_ust_channel
, node
);
169 DBG2("Trace UST channel %s not found by name", name
);
174 * Find the event in the hashtable and return event pointer. RCU read side lock
175 * MUST be acquired before calling this.
177 struct ltt_ust_event
*trace_ust_find_event(struct lttng_ht
*ht
,
178 char *name
, struct lttng_filter_bytecode
*filter
,
179 enum lttng_ust_loglevel_type loglevel_type
, int loglevel_value
,
180 struct lttng_event_exclusion
*exclusion
)
182 struct lttng_ht_node_str
*node
;
183 struct lttng_ht_iter iter
;
184 struct ltt_ust_ht_key key
;
191 key
.loglevel_type
= loglevel_type
;
192 key
.loglevel_value
= loglevel_value
;
193 key
.exclusion
= exclusion
;
195 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
196 trace_ust_ht_match_event
, &key
, &iter
.iter
);
197 node
= lttng_ht_iter_get_node_str(&iter
);
202 DBG2("Trace UST event %s found", key
.name
);
204 return caa_container_of(node
, struct ltt_ust_event
, node
);
207 DBG2("Trace UST event %s NOT found", key
.name
);
212 * Lookup an agent in the session agents hash table by domain type and return
213 * the object if found else NULL.
215 * RCU read side lock must be acquired before calling and only released
216 * once the agent is no longer in scope or being used.
218 struct agent
*trace_ust_find_agent(struct ltt_ust_session
*session
,
219 enum lttng_domain_type domain_type
)
221 struct agent
*agt
= NULL
;
222 struct lttng_ht_node_u64
*node
;
223 struct lttng_ht_iter iter
;
228 DBG3("Trace ust agent lookup for domain %d", domain_type
);
232 lttng_ht_lookup(session
->agents
, &key
, &iter
);
233 node
= lttng_ht_iter_get_node_u64(&iter
);
237 agt
= caa_container_of(node
, struct agent
, node
);
244 * Allocate and initialize a ust session data structure.
246 * Return pointer to structure or NULL.
248 struct ltt_ust_session
*trace_ust_create_session(uint64_t session_id
)
250 struct ltt_ust_session
*lus
;
252 /* Allocate a new ltt ust session */
253 lus
= zmalloc(sizeof(struct ltt_ust_session
));
255 PERROR("create ust session zmalloc");
259 /* Init data structure */
260 lus
->id
= session_id
;
263 /* Set default metadata channel attribute. */
264 lus
->metadata_attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
265 lus
->metadata_attr
.subbuf_size
= default_get_metadata_subbuf_size();
266 lus
->metadata_attr
.num_subbuf
= DEFAULT_METADATA_SUBBUF_NUM
;
267 lus
->metadata_attr
.switch_timer_interval
= DEFAULT_METADATA_SWITCH_TIMER
;
268 lus
->metadata_attr
.read_timer_interval
= DEFAULT_METADATA_READ_TIMER
;
269 lus
->metadata_attr
.output
= LTTNG_UST_MMAP
;
272 * Default buffer type. This can be changed through an enable channel
273 * requesting a different type. Note that this can only be changed once
274 * during the session lifetime which is at the first enable channel and
275 * only before start. The flag buffer_type_changed indicates the status.
277 lus
->buffer_type
= LTTNG_BUFFER_PER_UID
;
278 /* Once set to 1, the buffer_type is immutable for the session. */
279 lus
->buffer_type_changed
= 0;
280 /* Init it in case it get used after allocation. */
281 CDS_INIT_LIST_HEAD(&lus
->buffer_reg_uid_list
);
283 /* Alloc UST global domain channels' HT */
284 lus
->domain_global
.channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
285 /* Alloc agent hash table. */
286 lus
->agents
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
288 lus
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
289 if (lus
->consumer
== NULL
) {
293 DBG2("UST trace session create successful");
298 ht_cleanup_push(lus
->domain_global
.channels
);
299 ht_cleanup_push(lus
->agents
);
306 * Allocate and initialize a ust channel data structure.
308 * Return pointer to structure or NULL.
310 struct ltt_ust_channel
*trace_ust_create_channel(struct lttng_channel
*chan
,
311 enum lttng_domain_type domain
)
313 struct ltt_ust_channel
*luc
;
317 luc
= zmalloc(sizeof(struct ltt_ust_channel
));
319 PERROR("ltt_ust_channel zmalloc");
323 luc
->domain
= domain
;
325 /* Copy UST channel attributes */
326 luc
->attr
.overwrite
= chan
->attr
.overwrite
;
327 luc
->attr
.subbuf_size
= chan
->attr
.subbuf_size
;
328 luc
->attr
.num_subbuf
= chan
->attr
.num_subbuf
;
329 luc
->attr
.switch_timer_interval
= chan
->attr
.switch_timer_interval
;
330 luc
->attr
.read_timer_interval
= chan
->attr
.read_timer_interval
;
331 luc
->attr
.output
= (enum lttng_ust_output
) chan
->attr
.output
;
333 /* Translate to UST output enum */
334 switch (luc
->attr
.output
) {
336 luc
->attr
.output
= LTTNG_UST_MMAP
;
341 * If we receive an empty string for channel name, it means the
342 * default channel name is requested.
344 if (chan
->name
[0] == '\0') {
345 strncpy(luc
->name
, DEFAULT_CHANNEL_NAME
, sizeof(luc
->name
));
347 /* Copy channel name */
348 strncpy(luc
->name
, chan
->name
, sizeof(luc
->name
));
350 luc
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
353 lttng_ht_node_init_str(&luc
->node
, luc
->name
);
354 CDS_INIT_LIST_HEAD(&luc
->ctx_list
);
356 /* Alloc hash tables */
357 luc
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
358 luc
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
360 /* On-disk circular buffer parameters */
361 luc
->tracefile_size
= chan
->attr
.tracefile_size
;
362 luc
->tracefile_count
= chan
->attr
.tracefile_count
;
364 DBG2("Trace UST channel %s created", luc
->name
);
371 * Allocate and initialize a ust event. Set name and event type.
372 * We own filter_expression, filter, and exclusion.
374 * Return pointer to structure or NULL.
376 struct ltt_ust_event
*trace_ust_create_event(struct lttng_event
*ev
,
377 char *filter_expression
,
378 struct lttng_filter_bytecode
*filter
,
379 struct lttng_event_exclusion
*exclusion
,
382 struct ltt_ust_event
*lue
;
386 lue
= zmalloc(sizeof(struct ltt_ust_event
));
388 PERROR("ust event zmalloc");
392 lue
->internal
= internal_event
;
395 case LTTNG_EVENT_PROBE
:
396 lue
->attr
.instrumentation
= LTTNG_UST_PROBE
;
398 case LTTNG_EVENT_FUNCTION
:
399 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
401 case LTTNG_EVENT_FUNCTION_ENTRY
:
402 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
404 case LTTNG_EVENT_TRACEPOINT
:
405 lue
->attr
.instrumentation
= LTTNG_UST_TRACEPOINT
;
408 ERR("Unknown ust instrumentation type (%d)", ev
->type
);
409 goto error_free_event
;
412 /* Copy event name */
413 strncpy(lue
->attr
.name
, ev
->name
, LTTNG_UST_SYM_NAME_LEN
);
414 lue
->attr
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
416 switch (ev
->loglevel_type
) {
417 case LTTNG_EVENT_LOGLEVEL_ALL
:
418 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_ALL
;
419 lue
->attr
.loglevel
= -1; /* Force to -1 */
421 case LTTNG_EVENT_LOGLEVEL_RANGE
:
422 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_RANGE
;
423 lue
->attr
.loglevel
= ev
->loglevel
;
425 case LTTNG_EVENT_LOGLEVEL_SINGLE
:
426 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_SINGLE
;
427 lue
->attr
.loglevel
= ev
->loglevel
;
430 ERR("Unknown ust loglevel type (%d)", ev
->loglevel_type
);
431 goto error_free_event
;
435 lue
->filter_expression
= filter_expression
;
436 lue
->filter
= filter
;
437 lue
->exclusion
= exclusion
;
440 lttng_ht_node_init_str(&lue
->node
, lue
->attr
.name
);
442 DBG2("Trace UST event %s, loglevel (%d,%d) created",
443 lue
->attr
.name
, lue
->attr
.loglevel_type
,
451 free(filter_expression
);
458 int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type
)
463 case LTTNG_EVENT_CONTEXT_VTID
:
464 utype
= LTTNG_UST_CONTEXT_VTID
;
466 case LTTNG_EVENT_CONTEXT_VPID
:
467 utype
= LTTNG_UST_CONTEXT_VPID
;
469 case LTTNG_EVENT_CONTEXT_PTHREAD_ID
:
470 utype
= LTTNG_UST_CONTEXT_PTHREAD_ID
;
472 case LTTNG_EVENT_CONTEXT_PROCNAME
:
473 utype
= LTTNG_UST_CONTEXT_PROCNAME
;
475 case LTTNG_EVENT_CONTEXT_IP
:
476 utype
= LTTNG_UST_CONTEXT_IP
;
478 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER
:
479 if (!ustctl_has_perf_counters()) {
481 WARN("Perf counters not implemented in UST");
483 utype
= LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
;
487 ERR("Invalid UST context");
495 * Return 1 if contexts match, 0 otherwise.
497 int trace_ust_match_context(struct ltt_ust_context
*uctx
,
498 struct lttng_event_context
*ctx
)
502 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
506 if (uctx
->ctx
.ctx
!= utype
) {
510 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
511 if (uctx
->ctx
.u
.perf_counter
.type
512 != ctx
->u
.perf_counter
.type
) {
515 if (uctx
->ctx
.u
.perf_counter
.config
516 != ctx
->u
.perf_counter
.config
) {
519 if (strncmp(uctx
->ctx
.u
.perf_counter
.name
,
520 ctx
->u
.perf_counter
.name
,
521 LTTNG_UST_SYM_NAME_LEN
)) {
533 * Allocate and initialize an UST context.
535 * Return pointer to structure or NULL.
537 struct ltt_ust_context
*trace_ust_create_context(
538 struct lttng_event_context
*ctx
)
540 struct ltt_ust_context
*uctx
;
545 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
550 uctx
= zmalloc(sizeof(struct ltt_ust_context
));
552 PERROR("zmalloc ltt_ust_context");
556 uctx
->ctx
.ctx
= (enum lttng_ust_context_type
) utype
;
558 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
559 uctx
->ctx
.u
.perf_counter
.type
= ctx
->u
.perf_counter
.type
;
560 uctx
->ctx
.u
.perf_counter
.config
= ctx
->u
.perf_counter
.config
;
561 strncpy(uctx
->ctx
.u
.perf_counter
.name
, ctx
->u
.perf_counter
.name
,
562 LTTNG_UST_SYM_NAME_LEN
);
563 uctx
->ctx
.u
.perf_counter
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
568 lttng_ht_node_init_ulong(&uctx
->node
, (unsigned long) uctx
->ctx
.ctx
);
577 void destroy_pid_tracker_node_rcu(struct rcu_head
*head
)
579 struct ust_pid_tracker_node
*tracker_node
=
580 caa_container_of(head
, struct ust_pid_tracker_node
, node
.head
);
585 void destroy_pid_tracker_node(struct ust_pid_tracker_node
*tracker_node
)
588 call_rcu(&tracker_node
->node
.head
, destroy_pid_tracker_node_rcu
);
592 int init_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
596 pid_tracker
->ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
597 if (!pid_tracker
->ht
) {
607 * Teardown pid tracker content, but don't free pid_tracker object.
610 void fini_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
612 struct ust_pid_tracker_node
*tracker_node
;
613 struct lttng_ht_iter iter
;
615 if (!pid_tracker
->ht
) {
619 cds_lfht_for_each_entry(pid_tracker
->ht
->ht
,
620 &iter
.iter
, tracker_node
, node
.node
) {
621 int ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
624 destroy_pid_tracker_node(tracker_node
);
627 ht_cleanup_push(pid_tracker
->ht
);
628 pid_tracker
->ht
= NULL
;
632 struct ust_pid_tracker_node
*pid_tracker_lookup(
633 struct ust_pid_tracker
*pid_tracker
, int pid
,
634 struct lttng_ht_iter
*iter
)
636 unsigned long _pid
= (unsigned long) pid
;
637 struct lttng_ht_node_ulong
*node
;
639 lttng_ht_lookup(pid_tracker
->ht
, (void *) _pid
, iter
);
640 node
= lttng_ht_iter_get_node_ulong(iter
);
642 return caa_container_of(node
, struct ust_pid_tracker_node
,
650 int pid_tracker_add_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
652 int retval
= LTTNG_OK
;
653 struct ust_pid_tracker_node
*tracker_node
;
654 struct lttng_ht_iter iter
;
657 retval
= LTTNG_ERR_INVALID
;
660 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
662 /* Already exists. */
663 retval
= LTTNG_ERR_PID_TRACKED
;
666 tracker_node
= zmalloc(sizeof(*tracker_node
));
668 retval
= LTTNG_ERR_NOMEM
;
671 lttng_ht_node_init_ulong(&tracker_node
->node
, (unsigned long) pid
);
672 lttng_ht_add_unique_ulong(pid_tracker
->ht
, &tracker_node
->node
);
678 int pid_tracker_del_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
680 int retval
= LTTNG_OK
, ret
;
681 struct ust_pid_tracker_node
*tracker_node
;
682 struct lttng_ht_iter iter
;
685 retval
= LTTNG_ERR_INVALID
;
688 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
691 retval
= LTTNG_ERR_PID_NOT_TRACKED
;
694 ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
697 destroy_pid_tracker_node(tracker_node
);
703 * The session lock is held when calling this function.
705 int trace_ust_pid_tracker_lookup(struct ltt_ust_session
*session
, int pid
)
707 struct lttng_ht_iter iter
;
709 if (!session
->pid_tracker
.ht
) {
712 if (pid_tracker_lookup(&session
->pid_tracker
, pid
, &iter
)) {
719 * Called with the session lock held.
721 int trace_ust_track_pid(struct ltt_ust_session
*session
, int pid
)
723 int retval
= LTTNG_OK
;
726 /* Track all pids: destroy tracker if exists. */
727 if (session
->pid_tracker
.ht
) {
728 fini_pid_tracker(&session
->pid_tracker
);
729 /* Ensure all apps have session. */
730 ust_app_global_update_all(session
);
735 if (!session
->pid_tracker
.ht
) {
736 /* Create tracker. */
737 if (init_pid_tracker(&session
->pid_tracker
)) {
738 ERR("Error initializing PID tracker");
739 retval
= LTTNG_ERR_NOMEM
;
742 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
743 if (ret
!= LTTNG_OK
) {
745 fini_pid_tracker(&session
->pid_tracker
);
748 /* Remove all apps from session except pid. */
749 ust_app_global_update_all(session
);
753 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
754 if (ret
!= LTTNG_OK
) {
758 /* Add session to application */
759 app
= ust_app_find_by_pid(pid
);
761 ust_app_global_update(session
, app
);
770 * Called with the session lock held.
772 int trace_ust_untrack_pid(struct ltt_ust_session
*session
, int pid
)
774 int retval
= LTTNG_OK
;
777 /* Create empty tracker, replace old tracker. */
778 struct ust_pid_tracker tmp_tracker
;
780 tmp_tracker
= session
->pid_tracker
;
781 if (init_pid_tracker(&session
->pid_tracker
)) {
782 ERR("Error initializing PID tracker");
783 retval
= LTTNG_ERR_NOMEM
;
784 /* Rollback operation. */
785 session
->pid_tracker
= tmp_tracker
;
788 fini_pid_tracker(&tmp_tracker
);
790 /* Remove session from all applications */
791 ust_app_global_update_all(session
);
796 if (!session
->pid_tracker
.ht
) {
797 /* No PID being tracked. */
798 retval
= LTTNG_ERR_PID_NOT_TRACKED
;
801 /* Remove PID from tracker */
802 ret
= pid_tracker_del_pid(&session
->pid_tracker
, pid
);
803 if (ret
!= LTTNG_OK
) {
807 /* Remove session from application. */
808 app
= ust_app_find_by_pid(pid
);
810 ust_app_global_update(session
, app
);
818 * Called with session lock held.
820 ssize_t
trace_ust_list_tracker_pids(struct ltt_ust_session
*session
,
823 struct ust_pid_tracker_node
*tracker_node
;
824 struct lttng_ht_iter iter
;
825 unsigned long count
, i
= 0;
830 if (!session
->pid_tracker
.ht
) {
831 /* Tracker disabled. Set first entry to -1. */
832 pids
= zmalloc(sizeof(*pids
));
843 cds_lfht_count_nodes(session
->pid_tracker
.ht
->ht
,
844 &approx
[0], &count
, &approx
[1]);
845 pids
= zmalloc(sizeof(*pids
) * count
);
850 cds_lfht_for_each_entry(session
->pid_tracker
.ht
->ht
,
851 &iter
.iter
, tracker_node
, node
.node
) {
852 pids
[i
++] = tracker_node
->node
.key
;
862 * RCU safe free context structure.
864 static void destroy_context_rcu(struct rcu_head
*head
)
866 struct lttng_ht_node_ulong
*node
=
867 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
868 struct ltt_ust_context
*ctx
=
869 caa_container_of(node
, struct ltt_ust_context
, node
);
875 * Cleanup UST context hash table.
877 static void destroy_contexts(struct lttng_ht
*ht
)
880 struct lttng_ht_node_ulong
*node
;
881 struct lttng_ht_iter iter
;
882 struct ltt_ust_context
*ctx
;
887 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, node
, node
) {
888 /* Remove from ordered list. */
889 ctx
= caa_container_of(node
, struct ltt_ust_context
, node
);
890 cds_list_del(&ctx
->list
);
891 /* Remove from channel's hash table. */
892 ret
= lttng_ht_del(ht
, &iter
);
894 call_rcu(&node
->head
, destroy_context_rcu
);
903 * Cleanup ust event structure.
905 void trace_ust_destroy_event(struct ltt_ust_event
*event
)
909 DBG2("Trace destroy UST event %s", event
->attr
.name
);
910 free(event
->filter_expression
);
912 free(event
->exclusion
);
917 * URCU intermediate call to complete destroy event.
919 static void destroy_event_rcu(struct rcu_head
*head
)
921 struct lttng_ht_node_str
*node
=
922 caa_container_of(head
, struct lttng_ht_node_str
, head
);
923 struct ltt_ust_event
*event
=
924 caa_container_of(node
, struct ltt_ust_event
, node
);
926 trace_ust_destroy_event(event
);
930 * Cleanup UST events hashtable.
932 static void destroy_events(struct lttng_ht
*events
)
935 struct lttng_ht_node_str
*node
;
936 struct lttng_ht_iter iter
;
941 cds_lfht_for_each_entry(events
->ht
, &iter
.iter
, node
, node
) {
942 ret
= lttng_ht_del(events
, &iter
);
944 call_rcu(&node
->head
, destroy_event_rcu
);
948 ht_cleanup_push(events
);
952 * Cleanup ust channel structure.
954 * Should _NOT_ be called with RCU read lock held.
956 static void _trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
960 DBG2("Trace destroy UST channel %s", channel
->name
);
966 * URCU intermediate call to complete destroy channel.
968 static void destroy_channel_rcu(struct rcu_head
*head
)
970 struct lttng_ht_node_str
*node
=
971 caa_container_of(head
, struct lttng_ht_node_str
, head
);
972 struct ltt_ust_channel
*channel
=
973 caa_container_of(node
, struct ltt_ust_channel
, node
);
975 _trace_ust_destroy_channel(channel
);
978 void trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
980 /* Destroying all events of the channel */
981 destroy_events(channel
->events
);
982 /* Destroying all context of the channel */
983 destroy_contexts(channel
->ctx
);
985 call_rcu(&channel
->node
.head
, destroy_channel_rcu
);
989 * Remove an UST channel from a channel HT.
991 void trace_ust_delete_channel(struct lttng_ht
*ht
,
992 struct ltt_ust_channel
*channel
)
995 struct lttng_ht_iter iter
;
1000 iter
.iter
.node
= &channel
->node
.node
;
1001 ret
= lttng_ht_del(ht
, &iter
);
1006 * Iterate over a hash table containing channels and cleanup safely.
1008 static void destroy_channels(struct lttng_ht
*channels
)
1010 struct lttng_ht_node_str
*node
;
1011 struct lttng_ht_iter iter
;
1016 cds_lfht_for_each_entry(channels
->ht
, &iter
.iter
, node
, node
) {
1017 struct ltt_ust_channel
*chan
=
1018 caa_container_of(node
, struct ltt_ust_channel
, node
);
1020 trace_ust_delete_channel(channels
, chan
);
1021 trace_ust_destroy_channel(chan
);
1025 ht_cleanup_push(channels
);
1029 * Cleanup UST global domain.
1031 static void destroy_domain_global(struct ltt_ust_domain_global
*dom
)
1035 destroy_channels(dom
->channels
);
1039 * Cleanup ust session structure
1041 * Should *NOT* be called with RCU read-side lock held.
1043 void trace_ust_destroy_session(struct ltt_ust_session
*session
)
1046 struct buffer_reg_uid
*reg
, *sreg
;
1047 struct lttng_ht_iter iter
;
1051 DBG2("Trace UST destroy session %" PRIu64
, session
->id
);
1053 /* Cleaning up UST domain */
1054 destroy_domain_global(&session
->domain_global
);
1057 cds_lfht_for_each_entry(session
->agents
->ht
, &iter
.iter
, agt
, node
.node
) {
1058 int ret
= lttng_ht_del(session
->agents
, &iter
);
1065 ht_cleanup_push(session
->agents
);
1067 /* Cleanup UID buffer registry object(s). */
1068 cds_list_for_each_entry_safe(reg
, sreg
, &session
->buffer_reg_uid_list
,
1070 cds_list_del(®
->lnode
);
1071 buffer_reg_uid_remove(reg
);
1072 buffer_reg_uid_destroy(reg
, session
->consumer
);
1075 consumer_output_put(session
->consumer
);
1077 fini_pid_tracker(&session
->pid_tracker
);