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"
35 * Match function for the events hash table lookup.
37 * Matches by name only. Used by the disable command.
39 int trace_ust_ht_match_event_by_name(struct cds_lfht_node
*node
,
42 struct ltt_ust_event
*event
;
48 event
= caa_container_of(node
, struct ltt_ust_event
, node
.node
);
52 if (strncmp(event
->attr
.name
, name
, sizeof(event
->attr
.name
)) != 0) {
64 * Match function for the hash table lookup.
66 * It matches an ust event based on three attributes which are the event name,
67 * the filter bytecode and the loglevel.
69 int trace_ust_ht_match_event(struct cds_lfht_node
*node
, const void *_key
)
71 struct ltt_ust_event
*event
;
72 const struct ltt_ust_ht_key
*key
;
73 int ev_loglevel_value
;
78 event
= caa_container_of(node
, struct ltt_ust_event
, node
.node
);
80 ev_loglevel_value
= event
->attr
.loglevel
;
82 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
85 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
89 /* Event loglevel value and type. */
90 if (event
->attr
.loglevel_type
== key
->loglevel_type
) {
91 /* Same loglevel type. */
92 if (key
->loglevel_type
!= LTTNG_UST_LOGLEVEL_ALL
) {
94 * Loglevel value must also match since the loglevel
97 if (ev_loglevel_value
!= key
->loglevel_value
) {
102 /* Loglevel type is different: no match. */
106 /* Only one of the filters is NULL, fail. */
107 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
111 if (key
->filter
&& event
->filter
) {
112 /* Both filters exists, check length followed by the bytecode. */
113 if (event
->filter
->len
!= key
->filter
->len
||
114 memcmp(event
->filter
->data
, key
->filter
->data
,
115 event
->filter
->len
) != 0) {
120 /* If only one of the exclusions is NULL, fail. */
121 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
125 if (key
->exclusion
&& event
->exclusion
) {
126 /* Both exclusions exist; check count followed by names. */
127 if (event
->exclusion
->count
!= key
->exclusion
->count
||
128 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
129 event
->exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
) != 0) {
141 * Find the channel in the hashtable and return channel pointer. RCU read side
142 * lock MUST be acquired before calling this.
144 struct ltt_ust_channel
*trace_ust_find_channel_by_name(struct lttng_ht
*ht
,
147 struct lttng_ht_node_str
*node
;
148 struct lttng_ht_iter iter
;
151 * If we receive an empty string for channel name, it means the
152 * default channel name is requested.
155 name
= DEFAULT_CHANNEL_NAME
;
157 lttng_ht_lookup(ht
, (void *)name
, &iter
);
158 node
= lttng_ht_iter_get_node_str(&iter
);
163 DBG2("Trace UST channel %s found by name", name
);
165 return caa_container_of(node
, struct ltt_ust_channel
, node
);
168 DBG2("Trace UST channel %s not found by name", name
);
173 * Find the event in the hashtable and return event pointer. RCU read side lock
174 * MUST be acquired before calling this.
176 struct ltt_ust_event
*trace_ust_find_event(struct lttng_ht
*ht
,
177 char *name
, struct lttng_filter_bytecode
*filter
,
178 enum lttng_ust_loglevel_type loglevel_type
, int loglevel_value
,
179 struct lttng_event_exclusion
*exclusion
)
181 struct lttng_ht_node_str
*node
;
182 struct lttng_ht_iter iter
;
183 struct ltt_ust_ht_key key
;
190 key
.loglevel_type
= loglevel_type
;
191 key
.loglevel_value
= loglevel_value
;
192 key
.exclusion
= exclusion
;
194 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
195 trace_ust_ht_match_event
, &key
, &iter
.iter
);
196 node
= lttng_ht_iter_get_node_str(&iter
);
201 DBG2("Trace UST event %s found", key
.name
);
203 return caa_container_of(node
, struct ltt_ust_event
, node
);
206 DBG2("Trace UST event %s NOT found", key
.name
);
211 * Lookup an agent in the session agents hash table by domain type and return
212 * the object if found else NULL.
214 * RCU read side lock must be acquired before calling and only released
215 * once the agent is no longer in scope or being used.
217 struct agent
*trace_ust_find_agent(struct ltt_ust_session
*session
,
218 enum lttng_domain_type domain_type
)
220 struct agent
*agt
= NULL
;
221 struct lttng_ht_node_u64
*node
;
222 struct lttng_ht_iter iter
;
227 DBG3("Trace ust agent lookup for domain %d", domain_type
);
231 lttng_ht_lookup(session
->agents
, &key
, &iter
);
232 node
= lttng_ht_iter_get_node_u64(&iter
);
236 agt
= caa_container_of(node
, struct agent
, node
);
243 * Allocate and initialize a ust session data structure.
245 * Return pointer to structure or NULL.
247 struct ltt_ust_session
*trace_ust_create_session(uint64_t session_id
)
249 struct ltt_ust_session
*lus
;
251 /* Allocate a new ltt ust session */
252 lus
= zmalloc(sizeof(struct ltt_ust_session
));
254 PERROR("create ust session zmalloc");
258 /* Init data structure */
259 lus
->id
= session_id
;
262 /* Set default metadata channel attribute. */
263 lus
->metadata_attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
264 lus
->metadata_attr
.subbuf_size
= default_get_metadata_subbuf_size();
265 lus
->metadata_attr
.num_subbuf
= DEFAULT_METADATA_SUBBUF_NUM
;
266 lus
->metadata_attr
.switch_timer_interval
= DEFAULT_METADATA_SWITCH_TIMER
;
267 lus
->metadata_attr
.read_timer_interval
= DEFAULT_METADATA_READ_TIMER
;
268 lus
->metadata_attr
.output
= LTTNG_UST_MMAP
;
271 * Default buffer type. This can be changed through an enable channel
272 * requesting a different type. Note that this can only be changed once
273 * during the session lifetime which is at the first enable channel and
274 * only before start. The flag buffer_type_changed indicates the status.
276 lus
->buffer_type
= LTTNG_BUFFER_PER_UID
;
277 /* Once set to 1, the buffer_type is immutable for the session. */
278 lus
->buffer_type_changed
= 0;
279 /* Init it in case it get used after allocation. */
280 CDS_INIT_LIST_HEAD(&lus
->buffer_reg_uid_list
);
282 /* Alloc UST global domain channels' HT */
283 lus
->domain_global
.channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
284 /* Alloc agent hash table. */
285 lus
->agents
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
287 lus
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
288 if (lus
->consumer
== NULL
) {
292 DBG2("UST trace session create successful");
297 ht_cleanup_push(lus
->domain_global
.channels
);
298 ht_cleanup_push(lus
->agents
);
305 * Allocate and initialize a ust channel data structure.
307 * Return pointer to structure or NULL.
309 struct ltt_ust_channel
*trace_ust_create_channel(struct lttng_channel
*chan
,
310 enum lttng_domain_type domain
)
312 struct ltt_ust_channel
*luc
;
316 luc
= zmalloc(sizeof(struct ltt_ust_channel
));
318 PERROR("ltt_ust_channel zmalloc");
322 luc
->domain
= domain
;
324 /* Copy UST channel attributes */
325 luc
->attr
.overwrite
= chan
->attr
.overwrite
;
326 luc
->attr
.subbuf_size
= chan
->attr
.subbuf_size
;
327 luc
->attr
.num_subbuf
= chan
->attr
.num_subbuf
;
328 luc
->attr
.switch_timer_interval
= chan
->attr
.switch_timer_interval
;
329 luc
->attr
.read_timer_interval
= chan
->attr
.read_timer_interval
;
330 luc
->attr
.output
= (enum lttng_ust_output
) chan
->attr
.output
;
332 /* Translate to UST output enum */
333 switch (luc
->attr
.output
) {
335 luc
->attr
.output
= LTTNG_UST_MMAP
;
340 * If we receive an empty string for channel name, it means the
341 * default channel name is requested.
343 if (chan
->name
[0] == '\0') {
344 strncpy(luc
->name
, DEFAULT_CHANNEL_NAME
, sizeof(luc
->name
));
346 /* Copy channel name */
347 strncpy(luc
->name
, chan
->name
, sizeof(luc
->name
));
349 luc
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
352 lttng_ht_node_init_str(&luc
->node
, luc
->name
);
353 CDS_INIT_LIST_HEAD(&luc
->ctx_list
);
355 /* Alloc hash tables */
356 luc
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
357 luc
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
359 /* On-disk circular buffer parameters */
360 luc
->tracefile_size
= chan
->attr
.tracefile_size
;
361 luc
->tracefile_count
= chan
->attr
.tracefile_count
;
363 DBG2("Trace UST channel %s created", luc
->name
);
370 * Allocate and initialize a ust event. Set name and event type.
371 * We own filter_expression, filter, and exclusion.
373 * Return pointer to structure or NULL.
375 struct ltt_ust_event
*trace_ust_create_event(struct lttng_event
*ev
,
376 char *filter_expression
,
377 struct lttng_filter_bytecode
*filter
,
378 struct lttng_event_exclusion
*exclusion
,
381 struct ltt_ust_event
*lue
;
385 lue
= zmalloc(sizeof(struct ltt_ust_event
));
387 PERROR("ust event zmalloc");
391 lue
->internal
= internal_event
;
394 case LTTNG_EVENT_PROBE
:
395 lue
->attr
.instrumentation
= LTTNG_UST_PROBE
;
397 case LTTNG_EVENT_FUNCTION
:
398 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
400 case LTTNG_EVENT_FUNCTION_ENTRY
:
401 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
403 case LTTNG_EVENT_TRACEPOINT
:
404 lue
->attr
.instrumentation
= LTTNG_UST_TRACEPOINT
;
407 ERR("Unknown ust instrumentation type (%d)", ev
->type
);
408 goto error_free_event
;
411 /* Copy event name */
412 strncpy(lue
->attr
.name
, ev
->name
, LTTNG_UST_SYM_NAME_LEN
);
413 lue
->attr
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
415 switch (ev
->loglevel_type
) {
416 case LTTNG_EVENT_LOGLEVEL_ALL
:
417 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_ALL
;
418 lue
->attr
.loglevel
= -1; /* Force to -1 */
420 case LTTNG_EVENT_LOGLEVEL_RANGE
:
421 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_RANGE
;
422 lue
->attr
.loglevel
= ev
->loglevel
;
424 case LTTNG_EVENT_LOGLEVEL_SINGLE
:
425 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_SINGLE
;
426 lue
->attr
.loglevel
= ev
->loglevel
;
429 ERR("Unknown ust loglevel type (%d)", ev
->loglevel_type
);
430 goto error_free_event
;
434 lue
->filter_expression
= filter_expression
;
435 lue
->filter
= filter
;
436 lue
->exclusion
= exclusion
;
439 lttng_ht_node_init_str(&lue
->node
, lue
->attr
.name
);
441 DBG2("Trace UST event %s, loglevel (%d,%d) created",
442 lue
->attr
.name
, lue
->attr
.loglevel_type
,
450 free(filter_expression
);
457 int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type
)
462 case LTTNG_EVENT_CONTEXT_VTID
:
463 utype
= LTTNG_UST_CONTEXT_VTID
;
465 case LTTNG_EVENT_CONTEXT_VPID
:
466 utype
= LTTNG_UST_CONTEXT_VPID
;
468 case LTTNG_EVENT_CONTEXT_PTHREAD_ID
:
469 utype
= LTTNG_UST_CONTEXT_PTHREAD_ID
;
471 case LTTNG_EVENT_CONTEXT_PROCNAME
:
472 utype
= LTTNG_UST_CONTEXT_PROCNAME
;
474 case LTTNG_EVENT_CONTEXT_IP
:
475 utype
= LTTNG_UST_CONTEXT_IP
;
477 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER
:
478 if (!ustctl_has_perf_counters()) {
480 WARN("Perf counters not implemented in UST");
482 utype
= LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
;
486 ERR("Invalid UST context");
494 * Return 1 if contexts match, 0 otherwise.
496 int trace_ust_match_context(struct ltt_ust_context
*uctx
,
497 struct lttng_event_context
*ctx
)
501 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
505 if (uctx
->ctx
.ctx
!= utype
) {
509 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
510 if (uctx
->ctx
.u
.perf_counter
.type
511 != ctx
->u
.perf_counter
.type
) {
514 if (uctx
->ctx
.u
.perf_counter
.config
515 != ctx
->u
.perf_counter
.config
) {
518 if (strncmp(uctx
->ctx
.u
.perf_counter
.name
,
519 ctx
->u
.perf_counter
.name
,
520 LTTNG_UST_SYM_NAME_LEN
)) {
532 * Allocate and initialize an UST context.
534 * Return pointer to structure or NULL.
536 struct ltt_ust_context
*trace_ust_create_context(
537 struct lttng_event_context
*ctx
)
539 struct ltt_ust_context
*uctx
;
544 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
549 uctx
= zmalloc(sizeof(struct ltt_ust_context
));
551 PERROR("zmalloc ltt_ust_context");
555 uctx
->ctx
.ctx
= (enum lttng_ust_context_type
) utype
;
557 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
558 uctx
->ctx
.u
.perf_counter
.type
= ctx
->u
.perf_counter
.type
;
559 uctx
->ctx
.u
.perf_counter
.config
= ctx
->u
.perf_counter
.config
;
560 strncpy(uctx
->ctx
.u
.perf_counter
.name
, ctx
->u
.perf_counter
.name
,
561 LTTNG_UST_SYM_NAME_LEN
);
562 uctx
->ctx
.u
.perf_counter
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
567 lttng_ht_node_init_ulong(&uctx
->node
, (unsigned long) uctx
->ctx
.ctx
);
576 void destroy_pid_tracker_node_rcu(struct rcu_head
*head
)
578 struct ust_pid_tracker_node
*tracker_node
=
579 caa_container_of(head
, struct ust_pid_tracker_node
, node
.head
);
584 void destroy_pid_tracker_node(struct ust_pid_tracker_node
*tracker_node
)
587 call_rcu(&tracker_node
->node
.head
, destroy_pid_tracker_node_rcu
);
591 int init_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
595 pid_tracker
->ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
596 if (!pid_tracker
->ht
) {
606 * Teardown pid tracker content, but don't free pid_tracker object.
609 void fini_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
611 struct ust_pid_tracker_node
*tracker_node
;
612 struct lttng_ht_iter iter
;
614 if (!pid_tracker
->ht
) {
618 cds_lfht_for_each_entry(pid_tracker
->ht
->ht
,
619 &iter
.iter
, tracker_node
, node
.node
) {
620 int ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
623 destroy_pid_tracker_node(tracker_node
);
626 ht_cleanup_push(pid_tracker
->ht
);
627 pid_tracker
->ht
= NULL
;
631 struct ust_pid_tracker_node
*pid_tracker_lookup(
632 struct ust_pid_tracker
*pid_tracker
, int pid
,
633 struct lttng_ht_iter
*iter
)
635 unsigned long _pid
= (unsigned long) pid
;
636 struct lttng_ht_node_ulong
*node
;
638 lttng_ht_lookup(pid_tracker
->ht
, (void *) _pid
, iter
);
639 node
= lttng_ht_iter_get_node_ulong(iter
);
641 return caa_container_of(node
, struct ust_pid_tracker_node
,
649 int pid_tracker_add_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
651 int retval
= LTTNG_OK
;
652 struct ust_pid_tracker_node
*tracker_node
;
653 struct lttng_ht_iter iter
;
656 retval
= LTTNG_ERR_INVALID
;
659 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
661 /* Already exists. */
662 retval
= LTTNG_ERR_PID_TRACKED
;
665 tracker_node
= zmalloc(sizeof(*tracker_node
));
667 retval
= LTTNG_ERR_NOMEM
;
670 lttng_ht_node_init_ulong(&tracker_node
->node
, (unsigned long) pid
);
671 lttng_ht_add_unique_ulong(pid_tracker
->ht
, &tracker_node
->node
);
677 int pid_tracker_del_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
679 int retval
= LTTNG_OK
, ret
;
680 struct ust_pid_tracker_node
*tracker_node
;
681 struct lttng_ht_iter iter
;
684 retval
= LTTNG_ERR_INVALID
;
687 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
690 retval
= LTTNG_ERR_PID_NOT_TRACKED
;
693 ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
696 destroy_pid_tracker_node(tracker_node
);
702 * The session lock is held when calling this function.
704 int trace_ust_pid_tracker_lookup(struct ltt_ust_session
*session
, int pid
)
706 struct lttng_ht_iter iter
;
708 if (!session
->pid_tracker
.ht
) {
711 if (pid_tracker_lookup(&session
->pid_tracker
, pid
, &iter
)) {
718 * Called with the session lock held.
720 int trace_ust_track_pid(struct ltt_ust_session
*session
, int pid
)
722 int retval
= LTTNG_OK
;
725 /* Track all pids: destroy tracker if exists. */
726 if (session
->pid_tracker
.ht
) {
727 fini_pid_tracker(&session
->pid_tracker
);
728 /* Ensure all apps have session. */
729 ust_app_global_update_all(session
);
734 if (!session
->pid_tracker
.ht
) {
735 /* Create tracker. */
736 if (init_pid_tracker(&session
->pid_tracker
)) {
737 ERR("Error initializing PID tracker");
738 retval
= LTTNG_ERR_NOMEM
;
741 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
742 if (ret
!= LTTNG_OK
) {
744 fini_pid_tracker(&session
->pid_tracker
);
747 /* Remove all apps from session except pid. */
748 ust_app_global_update_all(session
);
752 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
753 if (ret
!= LTTNG_OK
) {
757 /* Add session to application */
758 app
= ust_app_find_by_pid(pid
);
760 ust_app_global_update(session
, app
);
769 * Called with the session lock held.
771 int trace_ust_untrack_pid(struct ltt_ust_session
*session
, int pid
)
773 int retval
= LTTNG_OK
;
776 /* Create empty tracker, replace old tracker. */
777 struct ust_pid_tracker tmp_tracker
;
779 tmp_tracker
= session
->pid_tracker
;
780 if (init_pid_tracker(&session
->pid_tracker
)) {
781 ERR("Error initializing PID tracker");
782 retval
= LTTNG_ERR_NOMEM
;
783 /* Rollback operation. */
784 session
->pid_tracker
= tmp_tracker
;
787 fini_pid_tracker(&tmp_tracker
);
789 /* Remove session from all applications */
790 ust_app_global_update_all(session
);
795 if (!session
->pid_tracker
.ht
) {
796 /* No PID being tracked. */
797 retval
= LTTNG_ERR_PID_NOT_TRACKED
;
800 /* Remove PID from tracker */
801 ret
= pid_tracker_del_pid(&session
->pid_tracker
, pid
);
802 if (ret
!= LTTNG_OK
) {
806 /* Remove session from application. */
807 app
= ust_app_find_by_pid(pid
);
809 ust_app_global_update(session
, app
);
817 * Called with session lock held.
819 ssize_t
trace_ust_list_tracker_pids(struct ltt_ust_session
*session
,
822 struct ust_pid_tracker_node
*tracker_node
;
823 struct lttng_ht_iter iter
;
824 unsigned long count
, i
= 0;
829 if (!session
->pid_tracker
.ht
) {
830 /* Tracker disabled. Set first entry to -1. */
831 pids
= zmalloc(sizeof(*pids
));
842 cds_lfht_count_nodes(session
->pid_tracker
.ht
->ht
,
843 &approx
[0], &count
, &approx
[1]);
844 pids
= zmalloc(sizeof(*pids
) * count
);
849 cds_lfht_for_each_entry(session
->pid_tracker
.ht
->ht
,
850 &iter
.iter
, tracker_node
, node
.node
) {
851 pids
[i
++] = tracker_node
->node
.key
;
861 * RCU safe free context structure.
863 static void destroy_context_rcu(struct rcu_head
*head
)
865 struct lttng_ht_node_ulong
*node
=
866 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
867 struct ltt_ust_context
*ctx
=
868 caa_container_of(node
, struct ltt_ust_context
, node
);
874 * Cleanup UST context hash table.
876 static void destroy_contexts(struct lttng_ht
*ht
)
879 struct lttng_ht_node_ulong
*node
;
880 struct lttng_ht_iter iter
;
881 struct ltt_ust_context
*ctx
;
886 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, node
, node
) {
887 /* Remove from ordered list. */
888 ctx
= caa_container_of(node
, struct ltt_ust_context
, node
);
889 cds_list_del(&ctx
->list
);
890 /* Remove from channel's hash table. */
891 ret
= lttng_ht_del(ht
, &iter
);
893 call_rcu(&node
->head
, destroy_context_rcu
);
902 * Cleanup ust event structure.
904 void trace_ust_destroy_event(struct ltt_ust_event
*event
)
908 DBG2("Trace destroy UST event %s", event
->attr
.name
);
909 free(event
->filter_expression
);
911 free(event
->exclusion
);
916 * URCU intermediate call to complete destroy event.
918 static void destroy_event_rcu(struct rcu_head
*head
)
920 struct lttng_ht_node_str
*node
=
921 caa_container_of(head
, struct lttng_ht_node_str
, head
);
922 struct ltt_ust_event
*event
=
923 caa_container_of(node
, struct ltt_ust_event
, node
);
925 trace_ust_destroy_event(event
);
929 * Cleanup UST events hashtable.
931 static void destroy_events(struct lttng_ht
*events
)
934 struct lttng_ht_node_str
*node
;
935 struct lttng_ht_iter iter
;
940 cds_lfht_for_each_entry(events
->ht
, &iter
.iter
, node
, node
) {
941 ret
= lttng_ht_del(events
, &iter
);
943 call_rcu(&node
->head
, destroy_event_rcu
);
947 ht_cleanup_push(events
);
951 * Cleanup ust channel structure.
953 * Should _NOT_ be called with RCU read lock held.
955 static void _trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
959 DBG2("Trace destroy UST channel %s", channel
->name
);
965 * URCU intermediate call to complete destroy channel.
967 static void destroy_channel_rcu(struct rcu_head
*head
)
969 struct lttng_ht_node_str
*node
=
970 caa_container_of(head
, struct lttng_ht_node_str
, head
);
971 struct ltt_ust_channel
*channel
=
972 caa_container_of(node
, struct ltt_ust_channel
, node
);
974 _trace_ust_destroy_channel(channel
);
977 void trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
979 /* Destroying all events of the channel */
980 destroy_events(channel
->events
);
981 /* Destroying all context of the channel */
982 destroy_contexts(channel
->ctx
);
984 call_rcu(&channel
->node
.head
, destroy_channel_rcu
);
988 * Remove an UST channel from a channel HT.
990 void trace_ust_delete_channel(struct lttng_ht
*ht
,
991 struct ltt_ust_channel
*channel
)
994 struct lttng_ht_iter iter
;
999 iter
.iter
.node
= &channel
->node
.node
;
1000 ret
= lttng_ht_del(ht
, &iter
);
1005 * Iterate over a hash table containing channels and cleanup safely.
1007 static void destroy_channels(struct lttng_ht
*channels
)
1009 struct lttng_ht_node_str
*node
;
1010 struct lttng_ht_iter iter
;
1015 cds_lfht_for_each_entry(channels
->ht
, &iter
.iter
, node
, node
) {
1016 struct ltt_ust_channel
*chan
=
1017 caa_container_of(node
, struct ltt_ust_channel
, node
);
1019 trace_ust_delete_channel(channels
, chan
);
1020 trace_ust_destroy_channel(chan
);
1024 ht_cleanup_push(channels
);
1028 * Cleanup UST global domain.
1030 static void destroy_domain_global(struct ltt_ust_domain_global
*dom
)
1034 destroy_channels(dom
->channels
);
1038 * Cleanup ust session structure
1040 * Should *NOT* be called with RCU read-side lock held.
1042 void trace_ust_destroy_session(struct ltt_ust_session
*session
)
1045 struct buffer_reg_uid
*reg
, *sreg
;
1046 struct lttng_ht_iter iter
;
1050 DBG2("Trace UST destroy session %" PRIu64
, session
->id
);
1052 /* Cleaning up UST domain */
1053 destroy_domain_global(&session
->domain_global
);
1056 cds_lfht_for_each_entry(session
->agents
->ht
, &iter
.iter
, agt
, node
.node
) {
1057 int ret
= lttng_ht_del(session
->agents
, &iter
);
1064 ht_cleanup_push(session
->agents
);
1066 /* Cleanup UID buffer registry object(s). */
1067 cds_list_for_each_entry_safe(reg
, sreg
, &session
->buffer_reg_uid_list
,
1069 cds_list_del(®
->lnode
);
1070 buffer_reg_uid_remove(reg
);
1071 buffer_reg_uid_destroy(reg
, session
->consumer
);
1074 consumer_output_put(session
->consumer
);
1076 fini_pid_tracker(&session
->pid_tracker
);