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
;
78 event
= caa_container_of(node
, struct ltt_ust_event
, node
.node
);
81 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
84 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
89 if (event
->attr
.loglevel
!= key
->loglevel
) {
90 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
91 && key
->loglevel
== 0 && event
->attr
.loglevel
== -1) {
93 * Match is accepted. This is because on event creation, the
94 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
95 * -1 are accepted for this loglevel type since 0 is the one set by
96 * the API when receiving an enable event.
103 /* Only one of the filters is NULL, fail. */
104 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
108 if (key
->filter
&& event
->filter
) {
109 /* Both filters exists, check length followed by the bytecode. */
110 if (event
->filter
->len
!= key
->filter
->len
||
111 memcmp(event
->filter
->data
, key
->filter
->data
,
112 event
->filter
->len
) != 0) {
117 /* If only one of the exclusions is NULL, fail. */
118 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
122 if (key
->exclusion
&& event
->exclusion
) {
123 /* Both exclusions exist; check count followed by names. */
124 if (event
->exclusion
->count
!= key
->exclusion
->count
||
125 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
126 event
->exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
) != 0) {
138 * Find the channel in the hashtable and return channel pointer. RCU read side
139 * lock MUST be acquired before calling this.
141 struct ltt_ust_channel
*trace_ust_find_channel_by_name(struct lttng_ht
*ht
,
144 struct lttng_ht_node_str
*node
;
145 struct lttng_ht_iter iter
;
148 * If we receive an empty string for channel name, it means the
149 * default channel name is requested.
152 name
= DEFAULT_CHANNEL_NAME
;
154 lttng_ht_lookup(ht
, (void *)name
, &iter
);
155 node
= lttng_ht_iter_get_node_str(&iter
);
160 DBG2("Trace UST channel %s found by name", name
);
162 return caa_container_of(node
, struct ltt_ust_channel
, node
);
165 DBG2("Trace UST channel %s not found by name", name
);
170 * Find the event in the hashtable and return event pointer. RCU read side lock
171 * MUST be acquired before calling this.
173 struct ltt_ust_event
*trace_ust_find_event(struct lttng_ht
*ht
,
174 char *name
, struct lttng_filter_bytecode
*filter
, int loglevel
,
175 struct lttng_event_exclusion
*exclusion
)
177 struct lttng_ht_node_str
*node
;
178 struct lttng_ht_iter iter
;
179 struct ltt_ust_ht_key key
;
186 key
.loglevel
= loglevel
;
187 key
.exclusion
= exclusion
;
189 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
190 trace_ust_ht_match_event
, &key
, &iter
.iter
);
191 node
= lttng_ht_iter_get_node_str(&iter
);
196 DBG2("Trace UST event %s found", key
.name
);
198 return caa_container_of(node
, struct ltt_ust_event
, node
);
201 DBG2("Trace UST event %s NOT found", key
.name
);
206 * Lookup an agent in the session agents hash table by domain type and return
207 * the object if found else NULL.
209 * RCU read side lock must be acquired before calling and only released
210 * once the agent is no longer in scope or being used.
212 struct agent
*trace_ust_find_agent(struct ltt_ust_session
*session
,
213 enum lttng_domain_type domain_type
)
215 struct agent
*agt
= NULL
;
216 struct lttng_ht_node_u64
*node
;
217 struct lttng_ht_iter iter
;
222 DBG3("Trace ust agent lookup for domain %d", domain_type
);
226 lttng_ht_lookup(session
->agents
, &key
, &iter
);
227 node
= lttng_ht_iter_get_node_u64(&iter
);
231 agt
= caa_container_of(node
, struct agent
, node
);
238 * Allocate and initialize a ust session data structure.
240 * Return pointer to structure or NULL.
242 struct ltt_ust_session
*trace_ust_create_session(uint64_t session_id
)
244 struct ltt_ust_session
*lus
;
246 /* Allocate a new ltt ust session */
247 lus
= zmalloc(sizeof(struct ltt_ust_session
));
249 PERROR("create ust session zmalloc");
253 /* Init data structure */
254 lus
->id
= session_id
;
257 /* Set default metadata channel attribute. */
258 lus
->metadata_attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
259 lus
->metadata_attr
.subbuf_size
= default_get_metadata_subbuf_size();
260 lus
->metadata_attr
.num_subbuf
= DEFAULT_METADATA_SUBBUF_NUM
;
261 lus
->metadata_attr
.switch_timer_interval
= DEFAULT_METADATA_SWITCH_TIMER
;
262 lus
->metadata_attr
.read_timer_interval
= DEFAULT_METADATA_READ_TIMER
;
263 lus
->metadata_attr
.output
= LTTNG_UST_MMAP
;
266 * Default buffer type. This can be changed through an enable channel
267 * requesting a different type. Note that this can only be changed once
268 * during the session lifetime which is at the first enable channel and
269 * only before start. The flag buffer_type_changed indicates the status.
271 lus
->buffer_type
= LTTNG_BUFFER_PER_UID
;
272 /* Once set to 1, the buffer_type is immutable for the session. */
273 lus
->buffer_type_changed
= 0;
274 /* Init it in case it get used after allocation. */
275 CDS_INIT_LIST_HEAD(&lus
->buffer_reg_uid_list
);
277 /* Alloc UST global domain channels' HT */
278 lus
->domain_global
.channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
279 /* Alloc agent hash table. */
280 lus
->agents
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
282 lus
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
283 if (lus
->consumer
== NULL
) {
288 * The tmp_consumer stays NULL until a set_consumer_uri command is
289 * executed. At this point, the consumer should be nullify until an
290 * enable_consumer command. This assignment is symbolic since we've zmalloc
293 lus
->tmp_consumer
= NULL
;
295 DBG2("UST trace session create successful");
300 ht_cleanup_push(lus
->domain_global
.channels
);
301 ht_cleanup_push(lus
->agents
);
308 * Allocate and initialize a ust channel data structure.
310 * Return pointer to structure or NULL.
312 struct ltt_ust_channel
*trace_ust_create_channel(struct lttng_channel
*chan
,
313 enum lttng_domain_type domain
)
315 struct ltt_ust_channel
*luc
;
319 luc
= zmalloc(sizeof(struct ltt_ust_channel
));
321 PERROR("ltt_ust_channel zmalloc");
325 luc
->domain
= domain
;
327 /* Copy UST channel attributes */
328 luc
->attr
.overwrite
= chan
->attr
.overwrite
;
329 luc
->attr
.subbuf_size
= chan
->attr
.subbuf_size
;
330 luc
->attr
.num_subbuf
= chan
->attr
.num_subbuf
;
331 luc
->attr
.switch_timer_interval
= chan
->attr
.switch_timer_interval
;
332 luc
->attr
.read_timer_interval
= chan
->attr
.read_timer_interval
;
333 luc
->attr
.output
= (enum lttng_ust_output
) chan
->attr
.output
;
335 /* Translate to UST output enum */
336 switch (luc
->attr
.output
) {
338 luc
->attr
.output
= LTTNG_UST_MMAP
;
343 * If we receive an empty string for channel name, it means the
344 * default channel name is requested.
346 if (chan
->name
[0] == '\0') {
347 strncpy(luc
->name
, DEFAULT_CHANNEL_NAME
, sizeof(luc
->name
));
349 /* Copy channel name */
350 strncpy(luc
->name
, chan
->name
, sizeof(luc
->name
));
352 luc
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
355 lttng_ht_node_init_str(&luc
->node
, luc
->name
);
356 CDS_INIT_LIST_HEAD(&luc
->ctx_list
);
358 /* Alloc hash tables */
359 luc
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
360 luc
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
362 /* On-disk circular buffer parameters */
363 luc
->tracefile_size
= chan
->attr
.tracefile_size
;
364 luc
->tracefile_count
= chan
->attr
.tracefile_count
;
366 DBG2("Trace UST channel %s created", luc
->name
);
373 * Allocate and initialize a ust event. Set name and event type.
374 * We own filter_expression, filter, and exclusion.
376 * Return pointer to structure or NULL.
378 struct ltt_ust_event
*trace_ust_create_event(struct lttng_event
*ev
,
379 char *filter_expression
,
380 struct lttng_filter_bytecode
*filter
,
381 struct lttng_event_exclusion
*exclusion
,
384 struct ltt_ust_event
*lue
;
388 lue
= zmalloc(sizeof(struct ltt_ust_event
));
390 PERROR("ust event zmalloc");
394 lue
->internal
= internal_event
;
397 case LTTNG_EVENT_PROBE
:
398 lue
->attr
.instrumentation
= LTTNG_UST_PROBE
;
400 case LTTNG_EVENT_FUNCTION
:
401 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
403 case LTTNG_EVENT_FUNCTION_ENTRY
:
404 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
406 case LTTNG_EVENT_TRACEPOINT
:
407 lue
->attr
.instrumentation
= LTTNG_UST_TRACEPOINT
;
410 ERR("Unknown ust instrumentation type (%d)", ev
->type
);
411 goto error_free_event
;
414 /* Copy event name */
415 strncpy(lue
->attr
.name
, ev
->name
, LTTNG_UST_SYM_NAME_LEN
);
416 lue
->attr
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
418 switch (ev
->loglevel_type
) {
419 case LTTNG_EVENT_LOGLEVEL_ALL
:
420 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_ALL
;
421 lue
->attr
.loglevel
= -1; /* Force to -1 */
423 case LTTNG_EVENT_LOGLEVEL_RANGE
:
424 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_RANGE
;
425 lue
->attr
.loglevel
= ev
->loglevel
;
427 case LTTNG_EVENT_LOGLEVEL_SINGLE
:
428 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_SINGLE
;
429 lue
->attr
.loglevel
= ev
->loglevel
;
432 ERR("Unknown ust loglevel type (%d)", ev
->loglevel_type
);
433 goto error_free_event
;
437 lue
->filter_expression
= filter_expression
;
438 lue
->filter
= filter
;
439 lue
->exclusion
= exclusion
;
442 lttng_ht_node_init_str(&lue
->node
, lue
->attr
.name
);
444 DBG2("Trace UST event %s, loglevel (%d,%d) created",
445 lue
->attr
.name
, lue
->attr
.loglevel_type
,
453 free(filter_expression
);
460 int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type
)
465 case LTTNG_EVENT_CONTEXT_VTID
:
466 utype
= LTTNG_UST_CONTEXT_VTID
;
468 case LTTNG_EVENT_CONTEXT_VPID
:
469 utype
= LTTNG_UST_CONTEXT_VPID
;
471 case LTTNG_EVENT_CONTEXT_PTHREAD_ID
:
472 utype
= LTTNG_UST_CONTEXT_PTHREAD_ID
;
474 case LTTNG_EVENT_CONTEXT_PROCNAME
:
475 utype
= LTTNG_UST_CONTEXT_PROCNAME
;
477 case LTTNG_EVENT_CONTEXT_IP
:
478 utype
= LTTNG_UST_CONTEXT_IP
;
480 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER
:
481 if (!ustctl_has_perf_counters()) {
483 WARN("Perf counters not implemented in UST");
485 utype
= LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
;
489 ERR("Invalid UST context");
497 * Return 1 if contexts match, 0 otherwise.
499 int trace_ust_match_context(struct ltt_ust_context
*uctx
,
500 struct lttng_event_context
*ctx
)
504 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
508 if (uctx
->ctx
.ctx
!= utype
) {
512 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
513 if (uctx
->ctx
.u
.perf_counter
.type
514 != ctx
->u
.perf_counter
.type
) {
517 if (uctx
->ctx
.u
.perf_counter
.config
518 != ctx
->u
.perf_counter
.config
) {
521 if (strncmp(uctx
->ctx
.u
.perf_counter
.name
,
522 ctx
->u
.perf_counter
.name
,
523 LTTNG_UST_SYM_NAME_LEN
)) {
535 * Allocate and initialize an UST context.
537 * Return pointer to structure or NULL.
539 struct ltt_ust_context
*trace_ust_create_context(
540 struct lttng_event_context
*ctx
)
542 struct ltt_ust_context
*uctx
;
547 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
552 uctx
= zmalloc(sizeof(struct ltt_ust_context
));
554 PERROR("zmalloc ltt_ust_context");
558 uctx
->ctx
.ctx
= (enum lttng_ust_context_type
) utype
;
560 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
561 uctx
->ctx
.u
.perf_counter
.type
= ctx
->u
.perf_counter
.type
;
562 uctx
->ctx
.u
.perf_counter
.config
= ctx
->u
.perf_counter
.config
;
563 strncpy(uctx
->ctx
.u
.perf_counter
.name
, ctx
->u
.perf_counter
.name
,
564 LTTNG_UST_SYM_NAME_LEN
);
565 uctx
->ctx
.u
.perf_counter
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
570 lttng_ht_node_init_ulong(&uctx
->node
, (unsigned long) uctx
->ctx
.ctx
);
579 void destroy_pid_tracker_node_rcu(struct rcu_head
*head
)
581 struct ust_pid_tracker_node
*tracker_node
=
582 caa_container_of(head
, struct ust_pid_tracker_node
, node
.head
);
587 void destroy_pid_tracker_node(struct ust_pid_tracker_node
*tracker_node
)
590 call_rcu(&tracker_node
->node
.head
, destroy_pid_tracker_node_rcu
);
594 int init_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
598 pid_tracker
->ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
599 if (!pid_tracker
->ht
) {
609 * Teardown pid tracker content, but don't free pid_tracker object.
612 void fini_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
614 struct ust_pid_tracker_node
*tracker_node
;
615 struct lttng_ht_iter iter
;
617 if (!pid_tracker
->ht
) {
621 cds_lfht_for_each_entry(pid_tracker
->ht
->ht
,
622 &iter
.iter
, tracker_node
, node
.node
) {
623 int ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
626 destroy_pid_tracker_node(tracker_node
);
629 ht_cleanup_push(pid_tracker
->ht
);
630 pid_tracker
->ht
= NULL
;
634 struct ust_pid_tracker_node
*pid_tracker_lookup(
635 struct ust_pid_tracker
*pid_tracker
, int pid
,
636 struct lttng_ht_iter
*iter
)
638 unsigned long _pid
= (unsigned long) pid
;
639 struct lttng_ht_node_ulong
*node
;
641 lttng_ht_lookup(pid_tracker
->ht
, (void *) _pid
, iter
);
642 node
= lttng_ht_iter_get_node_ulong(iter
);
644 return caa_container_of(node
, struct ust_pid_tracker_node
,
652 int pid_tracker_add_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
654 int retval
= LTTNG_OK
;
655 struct ust_pid_tracker_node
*tracker_node
;
656 struct lttng_ht_iter iter
;
659 retval
= LTTNG_ERR_INVALID
;
662 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
664 /* Already exists. */
665 retval
= LTTNG_ERR_PID_TRACKED
;
668 tracker_node
= zmalloc(sizeof(*tracker_node
));
670 retval
= LTTNG_ERR_NOMEM
;
673 lttng_ht_node_init_ulong(&tracker_node
->node
, (unsigned long) pid
);
674 lttng_ht_add_unique_ulong(pid_tracker
->ht
, &tracker_node
->node
);
680 int pid_tracker_del_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
682 int retval
= LTTNG_OK
, ret
;
683 struct ust_pid_tracker_node
*tracker_node
;
684 struct lttng_ht_iter iter
;
687 retval
= LTTNG_ERR_INVALID
;
690 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
693 retval
= LTTNG_ERR_PID_NOT_TRACKED
;
696 ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
699 destroy_pid_tracker_node(tracker_node
);
705 * The session lock is held when calling this function.
707 int trace_ust_pid_tracker_lookup(struct ltt_ust_session
*session
, int pid
)
709 struct lttng_ht_iter iter
;
711 if (!session
->pid_tracker
.ht
) {
714 if (pid_tracker_lookup(&session
->pid_tracker
, pid
, &iter
)) {
721 * Called with the session lock held.
723 int trace_ust_track_pid(struct ltt_ust_session
*session
, int pid
)
725 int retval
= LTTNG_OK
;
728 /* Track all pids: destroy tracker if exists. */
729 if (session
->pid_tracker
.ht
) {
730 fini_pid_tracker(&session
->pid_tracker
);
731 /* Ensure all apps have session. */
732 ust_app_global_update_all(session
);
737 if (!session
->pid_tracker
.ht
) {
738 /* Create tracker. */
739 if (init_pid_tracker(&session
->pid_tracker
)) {
740 ERR("Error initializing PID tracker");
741 retval
= LTTNG_ERR_NOMEM
;
744 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
745 if (ret
!= LTTNG_OK
) {
747 fini_pid_tracker(&session
->pid_tracker
);
750 /* Remove all apps from session except pid. */
751 ust_app_global_update_all(session
);
755 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
756 if (ret
!= LTTNG_OK
) {
760 /* Add session to application */
761 app
= ust_app_find_by_pid(pid
);
763 ust_app_global_update(session
, app
);
772 * Called with the session lock held.
774 int trace_ust_untrack_pid(struct ltt_ust_session
*session
, int pid
)
776 int retval
= LTTNG_OK
;
779 /* Create empty tracker, replace old tracker. */
780 struct ust_pid_tracker tmp_tracker
;
782 tmp_tracker
= session
->pid_tracker
;
783 if (init_pid_tracker(&session
->pid_tracker
)) {
784 ERR("Error initializing PID tracker");
785 retval
= LTTNG_ERR_NOMEM
;
786 /* Rollback operation. */
787 session
->pid_tracker
= tmp_tracker
;
790 fini_pid_tracker(&tmp_tracker
);
792 /* Remove session from all applications */
793 ust_app_global_update_all(session
);
798 if (!session
->pid_tracker
.ht
) {
799 retval
= LTTNG_ERR_INVALID
;
802 /* Remove PID from tracker */
803 ret
= pid_tracker_del_pid(&session
->pid_tracker
, pid
);
804 if (ret
!= LTTNG_OK
) {
808 /* Remove session from application. */
809 app
= ust_app_find_by_pid(pid
);
811 ust_app_global_update(session
, app
);
819 * Called with session lock held.
821 ssize_t
trace_ust_list_tracker_pids(struct ltt_ust_session
*session
,
824 struct ust_pid_tracker_node
*tracker_node
;
825 struct lttng_ht_iter iter
;
826 unsigned long count
, i
= 0;
831 if (!session
->pid_tracker
.ht
) {
832 /* Tracker disabled. Set first entry to -1. */
833 pids
= zmalloc(sizeof(*pids
));
844 cds_lfht_count_nodes(session
->pid_tracker
.ht
->ht
,
845 &approx
[0], &count
, &approx
[1]);
846 pids
= zmalloc(sizeof(*pids
) * count
);
851 cds_lfht_for_each_entry(session
->pid_tracker
.ht
->ht
,
852 &iter
.iter
, tracker_node
, node
.node
) {
853 pids
[i
++] = tracker_node
->node
.key
;
863 * RCU safe free context structure.
865 static void destroy_context_rcu(struct rcu_head
*head
)
867 struct lttng_ht_node_ulong
*node
=
868 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
869 struct ltt_ust_context
*ctx
=
870 caa_container_of(node
, struct ltt_ust_context
, node
);
876 * Cleanup UST context hash table.
878 static void destroy_contexts(struct lttng_ht
*ht
)
881 struct lttng_ht_node_ulong
*node
;
882 struct lttng_ht_iter iter
;
883 struct ltt_ust_context
*ctx
;
888 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, node
, node
) {
889 /* Remove from ordered list. */
890 ctx
= caa_container_of(node
, struct ltt_ust_context
, node
);
891 cds_list_del(&ctx
->list
);
892 /* Remove from channel's hash table. */
893 ret
= lttng_ht_del(ht
, &iter
);
895 call_rcu(&node
->head
, destroy_context_rcu
);
904 * Cleanup ust event structure.
906 void trace_ust_destroy_event(struct ltt_ust_event
*event
)
910 DBG2("Trace destroy UST event %s", event
->attr
.name
);
911 free(event
->filter_expression
);
913 free(event
->exclusion
);
918 * URCU intermediate call to complete destroy event.
920 static void destroy_event_rcu(struct rcu_head
*head
)
922 struct lttng_ht_node_str
*node
=
923 caa_container_of(head
, struct lttng_ht_node_str
, head
);
924 struct ltt_ust_event
*event
=
925 caa_container_of(node
, struct ltt_ust_event
, node
);
927 trace_ust_destroy_event(event
);
931 * Cleanup UST events hashtable.
933 static void destroy_events(struct lttng_ht
*events
)
936 struct lttng_ht_node_str
*node
;
937 struct lttng_ht_iter iter
;
942 cds_lfht_for_each_entry(events
->ht
, &iter
.iter
, node
, node
) {
943 ret
= lttng_ht_del(events
, &iter
);
945 call_rcu(&node
->head
, destroy_event_rcu
);
949 ht_cleanup_push(events
);
953 * Cleanup ust channel structure.
955 * Should _NOT_ be called with RCU read lock held.
957 static void _trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
961 DBG2("Trace destroy UST channel %s", channel
->name
);
963 /* Destroying all events of the channel */
964 destroy_events(channel
->events
);
965 /* Destroying all context of the channel */
966 destroy_contexts(channel
->ctx
);
972 * URCU intermediate call to complete destroy channel.
974 static void destroy_channel_rcu(struct rcu_head
*head
)
976 struct lttng_ht_node_str
*node
=
977 caa_container_of(head
, struct lttng_ht_node_str
, head
);
978 struct ltt_ust_channel
*channel
=
979 caa_container_of(node
, struct ltt_ust_channel
, node
);
981 _trace_ust_destroy_channel(channel
);
984 void trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
986 call_rcu(&channel
->node
.head
, destroy_channel_rcu
);
990 * Remove an UST channel from a channel HT.
992 void trace_ust_delete_channel(struct lttng_ht
*ht
,
993 struct ltt_ust_channel
*channel
)
996 struct lttng_ht_iter iter
;
1001 iter
.iter
.node
= &channel
->node
.node
;
1002 ret
= lttng_ht_del(ht
, &iter
);
1007 * Iterate over a hash table containing channels and cleanup safely.
1009 static void destroy_channels(struct lttng_ht
*channels
)
1012 struct lttng_ht_node_str
*node
;
1013 struct lttng_ht_iter iter
;
1019 cds_lfht_for_each_entry(channels
->ht
, &iter
.iter
, node
, node
) {
1020 ret
= lttng_ht_del(channels
, &iter
);
1022 call_rcu(&node
->head
, destroy_channel_rcu
);
1026 ht_cleanup_push(channels
);
1030 * Cleanup UST global domain.
1032 static void destroy_domain_global(struct ltt_ust_domain_global
*dom
)
1036 destroy_channels(dom
->channels
);
1040 * Cleanup ust session structure
1042 * Should *NOT* be called with RCU read-side lock held.
1044 void trace_ust_destroy_session(struct ltt_ust_session
*session
)
1047 struct buffer_reg_uid
*reg
, *sreg
;
1048 struct lttng_ht_iter iter
;
1052 DBG2("Trace UST destroy session %" PRIu64
, session
->id
);
1054 /* Cleaning up UST domain */
1055 destroy_domain_global(&session
->domain_global
);
1058 cds_lfht_for_each_entry(session
->agents
->ht
, &iter
.iter
, agt
, node
.node
) {
1059 int ret
= lttng_ht_del(session
->agents
, &iter
);
1066 ht_cleanup_push(session
->agents
);
1068 /* Cleanup UID buffer registry object(s). */
1069 cds_list_for_each_entry_safe(reg
, sreg
, &session
->buffer_reg_uid_list
,
1071 cds_list_del(®
->lnode
);
1072 buffer_reg_uid_remove(reg
);
1073 buffer_reg_uid_destroy(reg
, session
->consumer
);
1076 consumer_destroy_output(session
->consumer
);
1077 consumer_destroy_output(session
->tmp_consumer
);
1079 fini_pid_tracker(&session
->pid_tracker
);