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
;
77 event
= caa_container_of(node
, struct ltt_ust_event
, node
.node
);
80 /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
83 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
88 if (event
->attr
.loglevel
!= key
->loglevel
) {
89 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
90 && key
->loglevel
== 0 && event
->attr
.loglevel
== -1) {
92 * Match is accepted. This is because on event creation, the
93 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
94 * -1 are accepted for this loglevel type since 0 is the one set by
95 * the API when receiving an enable event.
102 /* Only one of the filters is NULL, fail. */
103 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
107 if (key
->filter
&& event
->filter
) {
108 /* Both filters exists, check length followed by the bytecode. */
109 if (event
->filter
->len
!= key
->filter
->len
||
110 memcmp(event
->filter
->data
, key
->filter
->data
,
111 event
->filter
->len
) != 0) {
116 /* If only one of the exclusions is NULL, fail. */
117 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
121 if (key
->exclusion
&& event
->exclusion
) {
122 /* Both exclusions exist; check count followed by names. */
123 if (event
->exclusion
->count
!= key
->exclusion
->count
||
124 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
125 event
->exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
) != 0) {
137 * Find the channel in the hashtable and return channel pointer. RCU read side
138 * lock MUST be acquired before calling this.
140 struct ltt_ust_channel
*trace_ust_find_channel_by_name(struct lttng_ht
*ht
,
143 struct lttng_ht_node_str
*node
;
144 struct lttng_ht_iter iter
;
147 * If we receive an empty string for channel name, it means the
148 * default channel name is requested.
151 name
= DEFAULT_CHANNEL_NAME
;
153 lttng_ht_lookup(ht
, (void *)name
, &iter
);
154 node
= lttng_ht_iter_get_node_str(&iter
);
159 DBG2("Trace UST channel %s found by name", name
);
161 return caa_container_of(node
, struct ltt_ust_channel
, node
);
164 DBG2("Trace UST channel %s not found by name", name
);
169 * Find the event in the hashtable and return event pointer. RCU read side lock
170 * MUST be acquired before calling this.
172 struct ltt_ust_event
*trace_ust_find_event(struct lttng_ht
*ht
,
173 char *name
, struct lttng_filter_bytecode
*filter
, int loglevel
,
174 struct lttng_event_exclusion
*exclusion
)
176 struct lttng_ht_node_str
*node
;
177 struct lttng_ht_iter iter
;
178 struct ltt_ust_ht_key key
;
185 key
.loglevel
= loglevel
;
186 key
.exclusion
= exclusion
;
188 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
189 trace_ust_ht_match_event
, &key
, &iter
.iter
);
190 node
= lttng_ht_iter_get_node_str(&iter
);
195 DBG2("Trace UST event %s found", key
.name
);
197 return caa_container_of(node
, struct ltt_ust_event
, node
);
200 DBG2("Trace UST event %s NOT found", key
.name
);
205 * Lookup an agent in the session agents hash table by domain type and return
206 * the object if found else NULL.
208 * RCU read side lock must be acquired before calling and only released
209 * once the agent is no longer in scope or being used.
211 struct agent
*trace_ust_find_agent(struct ltt_ust_session
*session
,
212 enum lttng_domain_type domain_type
)
214 struct agent
*agt
= NULL
;
215 struct lttng_ht_node_u64
*node
;
216 struct lttng_ht_iter iter
;
221 DBG3("Trace ust agent lookup for domain %d", domain_type
);
225 lttng_ht_lookup(session
->agents
, &key
, &iter
);
226 node
= lttng_ht_iter_get_node_u64(&iter
);
230 agt
= caa_container_of(node
, struct agent
, node
);
237 * Allocate and initialize a ust session data structure.
239 * Return pointer to structure or NULL.
241 struct ltt_ust_session
*trace_ust_create_session(uint64_t session_id
)
243 struct ltt_ust_session
*lus
;
245 /* Allocate a new ltt ust session */
246 lus
= zmalloc(sizeof(struct ltt_ust_session
));
248 PERROR("create ust session zmalloc");
252 /* Init data structure */
253 lus
->id
= session_id
;
256 /* Set default metadata channel attribute. */
257 lus
->metadata_attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
258 lus
->metadata_attr
.subbuf_size
= default_get_metadata_subbuf_size();
259 lus
->metadata_attr
.num_subbuf
= DEFAULT_METADATA_SUBBUF_NUM
;
260 lus
->metadata_attr
.switch_timer_interval
= DEFAULT_METADATA_SWITCH_TIMER
;
261 lus
->metadata_attr
.read_timer_interval
= DEFAULT_METADATA_READ_TIMER
;
262 lus
->metadata_attr
.output
= LTTNG_UST_MMAP
;
265 * Default buffer type. This can be changed through an enable channel
266 * requesting a different type. Note that this can only be changed once
267 * during the session lifetime which is at the first enable channel and
268 * only before start. The flag buffer_type_changed indicates the status.
270 lus
->buffer_type
= LTTNG_BUFFER_PER_UID
;
271 /* Once set to 1, the buffer_type is immutable for the session. */
272 lus
->buffer_type_changed
= 0;
273 /* Init it in case it get used after allocation. */
274 CDS_INIT_LIST_HEAD(&lus
->buffer_reg_uid_list
);
276 /* Alloc UST global domain channels' HT */
277 lus
->domain_global
.channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
278 /* Alloc agent hash table. */
279 lus
->agents
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
281 lus
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
282 if (lus
->consumer
== NULL
) {
287 * The tmp_consumer stays NULL until a set_consumer_uri command is
288 * executed. At this point, the consumer should be nullify until an
289 * enable_consumer command. This assignment is symbolic since we've zmalloc
292 lus
->tmp_consumer
= NULL
;
294 DBG2("UST trace session create successful");
299 ht_cleanup_push(lus
->domain_global
.channels
);
300 ht_cleanup_push(lus
->agents
);
307 * Allocate and initialize a ust channel data structure.
309 * Return pointer to structure or NULL.
311 struct ltt_ust_channel
*trace_ust_create_channel(struct lttng_channel
*chan
)
313 struct ltt_ust_channel
*luc
;
317 luc
= zmalloc(sizeof(struct ltt_ust_channel
));
319 PERROR("ltt_ust_channel zmalloc");
323 /* Copy UST channel attributes */
324 luc
->attr
.overwrite
= chan
->attr
.overwrite
;
325 luc
->attr
.subbuf_size
= chan
->attr
.subbuf_size
;
326 luc
->attr
.num_subbuf
= chan
->attr
.num_subbuf
;
327 luc
->attr
.switch_timer_interval
= chan
->attr
.switch_timer_interval
;
328 luc
->attr
.read_timer_interval
= chan
->attr
.read_timer_interval
;
329 luc
->attr
.output
= (enum lttng_ust_output
) chan
->attr
.output
;
331 /* Translate to UST output enum */
332 switch (luc
->attr
.output
) {
334 luc
->attr
.output
= LTTNG_UST_MMAP
;
339 * If we receive an empty string for channel name, it means the
340 * default channel name is requested.
342 if (chan
->name
[0] == '\0') {
343 strncpy(luc
->name
, DEFAULT_CHANNEL_NAME
, sizeof(luc
->name
));
345 /* Copy channel name */
346 strncpy(luc
->name
, chan
->name
, sizeof(luc
->name
));
348 luc
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
351 lttng_ht_node_init_str(&luc
->node
, luc
->name
);
352 CDS_INIT_LIST_HEAD(&luc
->ctx_list
);
354 /* Alloc hash tables */
355 luc
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
356 luc
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
358 /* On-disk circular buffer parameters */
359 luc
->tracefile_size
= chan
->attr
.tracefile_size
;
360 luc
->tracefile_count
= chan
->attr
.tracefile_count
;
362 DBG2("Trace UST channel %s created", luc
->name
);
369 * Allocate and initialize a ust event. Set name and event type.
370 * We own filter_expression, filter, and exclusion.
372 * Return pointer to structure or NULL.
374 struct ltt_ust_event
*trace_ust_create_event(struct lttng_event
*ev
,
375 char *filter_expression
,
376 struct lttng_filter_bytecode
*filter
,
377 struct lttng_event_exclusion
*exclusion
,
380 struct ltt_ust_event
*lue
;
384 lue
= zmalloc(sizeof(struct ltt_ust_event
));
386 PERROR("ust event zmalloc");
390 lue
->internal
= internal_event
;
393 case LTTNG_EVENT_PROBE
:
394 lue
->attr
.instrumentation
= LTTNG_UST_PROBE
;
396 case LTTNG_EVENT_FUNCTION
:
397 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
399 case LTTNG_EVENT_FUNCTION_ENTRY
:
400 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
402 case LTTNG_EVENT_TRACEPOINT
:
403 lue
->attr
.instrumentation
= LTTNG_UST_TRACEPOINT
;
406 ERR("Unknown ust instrumentation type (%d)", ev
->type
);
407 goto error_free_event
;
410 /* Copy event name */
411 strncpy(lue
->attr
.name
, ev
->name
, LTTNG_UST_SYM_NAME_LEN
);
412 lue
->attr
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
414 switch (ev
->loglevel_type
) {
415 case LTTNG_EVENT_LOGLEVEL_ALL
:
416 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_ALL
;
417 lue
->attr
.loglevel
= -1; /* Force to -1 */
419 case LTTNG_EVENT_LOGLEVEL_RANGE
:
420 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_RANGE
;
421 lue
->attr
.loglevel
= ev
->loglevel
;
423 case LTTNG_EVENT_LOGLEVEL_SINGLE
:
424 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_SINGLE
;
425 lue
->attr
.loglevel
= ev
->loglevel
;
428 ERR("Unknown ust loglevel type (%d)", ev
->loglevel_type
);
429 goto error_free_event
;
433 lue
->filter_expression
= filter_expression
;
434 lue
->filter
= (struct lttng_ust_filter_bytecode
*) filter
;
435 lue
->exclusion
= (struct lttng_event_exclusion
*) exclusion
;
438 lttng_ht_node_init_str(&lue
->node
, lue
->attr
.name
);
440 DBG2("Trace UST event %s, loglevel (%d,%d) created",
441 lue
->attr
.name
, lue
->attr
.loglevel_type
,
449 free(filter_expression
);
456 int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type
)
461 case LTTNG_EVENT_CONTEXT_VTID
:
462 utype
= LTTNG_UST_CONTEXT_VTID
;
464 case LTTNG_EVENT_CONTEXT_VPID
:
465 utype
= LTTNG_UST_CONTEXT_VPID
;
467 case LTTNG_EVENT_CONTEXT_PTHREAD_ID
:
468 utype
= LTTNG_UST_CONTEXT_PTHREAD_ID
;
470 case LTTNG_EVENT_CONTEXT_PROCNAME
:
471 utype
= LTTNG_UST_CONTEXT_PROCNAME
;
473 case LTTNG_EVENT_CONTEXT_IP
:
474 utype
= LTTNG_UST_CONTEXT_IP
;
476 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER
:
477 if (!ustctl_has_perf_counters()) {
479 WARN("Perf counters not implemented in UST");
481 utype
= LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
;
485 ERR("Invalid UST context");
493 * Return 1 if contexts match, 0 otherwise.
495 int trace_ust_match_context(struct ltt_ust_context
*uctx
,
496 struct lttng_event_context
*ctx
)
500 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
504 if (uctx
->ctx
.ctx
!= utype
) {
508 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
509 if (uctx
->ctx
.u
.perf_counter
.type
510 != ctx
->u
.perf_counter
.type
) {
513 if (uctx
->ctx
.u
.perf_counter
.config
514 != ctx
->u
.perf_counter
.config
) {
517 if (strncmp(uctx
->ctx
.u
.perf_counter
.name
,
518 ctx
->u
.perf_counter
.name
,
519 LTTNG_UST_SYM_NAME_LEN
)) {
531 * Allocate and initialize an UST context.
533 * Return pointer to structure or NULL.
535 struct ltt_ust_context
*trace_ust_create_context(
536 struct lttng_event_context
*ctx
)
538 struct ltt_ust_context
*uctx
;
543 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
548 uctx
= zmalloc(sizeof(struct ltt_ust_context
));
550 PERROR("zmalloc ltt_ust_context");
554 uctx
->ctx
.ctx
= (enum lttng_ust_context_type
) utype
;
556 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
557 uctx
->ctx
.u
.perf_counter
.type
= ctx
->u
.perf_counter
.type
;
558 uctx
->ctx
.u
.perf_counter
.config
= ctx
->u
.perf_counter
.config
;
559 strncpy(uctx
->ctx
.u
.perf_counter
.name
, ctx
->u
.perf_counter
.name
,
560 LTTNG_UST_SYM_NAME_LEN
);
561 uctx
->ctx
.u
.perf_counter
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
566 lttng_ht_node_init_ulong(&uctx
->node
, (unsigned long) uctx
->ctx
.ctx
);
575 void destroy_pid_tracker_node_rcu(struct rcu_head
*head
)
577 struct ust_pid_tracker_node
*tracker_node
=
578 caa_container_of(head
, struct ust_pid_tracker_node
, node
.head
);
583 void destroy_pid_tracker_node(struct ust_pid_tracker_node
*tracker_node
)
586 call_rcu(&tracker_node
->node
.head
, destroy_pid_tracker_node_rcu
);
590 int init_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
594 pid_tracker
->ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
595 if (!pid_tracker
->ht
) {
605 * Teardown pid tracker content, but don't free pid_tracker object.
608 void fini_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
610 struct ust_pid_tracker_node
*tracker_node
;
611 struct lttng_ht_iter iter
;
613 if (!pid_tracker
->ht
) {
617 cds_lfht_for_each_entry(pid_tracker
->ht
->ht
,
618 &iter
.iter
, tracker_node
, node
.node
) {
619 int ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
622 destroy_pid_tracker_node(tracker_node
);
625 ht_cleanup_push(pid_tracker
->ht
);
626 pid_tracker
->ht
= NULL
;
630 struct ust_pid_tracker_node
*pid_tracker_lookup(
631 struct ust_pid_tracker
*pid_tracker
, int pid
,
632 struct lttng_ht_iter
*iter
)
634 unsigned long _pid
= (unsigned long) pid
;
635 struct lttng_ht_node_ulong
*node
;
637 lttng_ht_lookup(pid_tracker
->ht
, (void *) _pid
, iter
);
638 node
= lttng_ht_iter_get_node_ulong(iter
);
640 return caa_container_of(node
, struct ust_pid_tracker_node
,
648 int pid_tracker_add_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
650 int retval
= LTTNG_OK
;
651 struct ust_pid_tracker_node
*tracker_node
;
652 struct lttng_ht_iter iter
;
655 retval
= LTTNG_ERR_INVALID
;
658 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
660 /* Already exists. */
661 retval
= LTTNG_ERR_PID_TRACKED
;
664 tracker_node
= zmalloc(sizeof(*tracker_node
));
666 retval
= LTTNG_ERR_NOMEM
;
669 lttng_ht_node_init_ulong(&tracker_node
->node
, (unsigned long) pid
);
670 lttng_ht_add_unique_ulong(pid_tracker
->ht
, &tracker_node
->node
);
676 int pid_tracker_del_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
678 int retval
= LTTNG_OK
, ret
;
679 struct ust_pid_tracker_node
*tracker_node
;
680 struct lttng_ht_iter iter
;
683 retval
= LTTNG_ERR_INVALID
;
686 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
689 retval
= LTTNG_ERR_PID_NOT_TRACKED
;
692 ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
695 destroy_pid_tracker_node(tracker_node
);
701 * The session lock is held when calling this function.
703 int trace_ust_pid_tracker_lookup(struct ltt_ust_session
*session
, int pid
)
705 struct lttng_ht_iter iter
;
707 if (!session
->pid_tracker
.ht
) {
710 if (pid_tracker_lookup(&session
->pid_tracker
, pid
, &iter
)) {
717 * Called with the session lock held.
719 int trace_ust_track_pid(struct ltt_ust_session
*session
, int pid
)
721 int retval
= LTTNG_OK
;
724 /* Track all pids: destroy tracker if exists. */
725 if (session
->pid_tracker
.ht
) {
726 fini_pid_tracker(&session
->pid_tracker
);
727 /* Ensure all apps have session. */
728 ust_app_global_update_all(session
);
733 if (!session
->pid_tracker
.ht
) {
734 /* Create tracker. */
735 if (init_pid_tracker(&session
->pid_tracker
)) {
736 ERR("Error initializing PID tracker");
737 retval
= LTTNG_ERR_NOMEM
;
740 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
741 if (ret
!= LTTNG_OK
) {
743 fini_pid_tracker(&session
->pid_tracker
);
746 /* Remove all apps from session except pid. */
747 ust_app_global_update_all(session
);
751 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
752 if (ret
!= LTTNG_OK
) {
756 /* Add session to application */
757 app
= ust_app_find_by_pid(pid
);
759 ust_app_global_update(session
, app
);
768 * Called with the session lock held.
770 int trace_ust_untrack_pid(struct ltt_ust_session
*session
, int pid
)
772 int retval
= LTTNG_OK
;
775 /* Create empty tracker, replace old tracker. */
776 struct ust_pid_tracker tmp_tracker
;
778 tmp_tracker
= session
->pid_tracker
;
779 if (init_pid_tracker(&session
->pid_tracker
)) {
780 ERR("Error initializing PID tracker");
781 retval
= LTTNG_ERR_NOMEM
;
782 /* Rollback operation. */
783 session
->pid_tracker
= tmp_tracker
;
786 fini_pid_tracker(&tmp_tracker
);
788 /* Remove session from all applications */
789 ust_app_global_update_all(session
);
794 if (!session
->pid_tracker
.ht
) {
795 retval
= LTTNG_ERR_INVALID
;
798 /* Remove PID from tracker */
799 ret
= pid_tracker_del_pid(&session
->pid_tracker
, pid
);
800 if (ret
!= LTTNG_OK
) {
804 /* Remove session from application. */
805 app
= ust_app_find_by_pid(pid
);
807 ust_app_global_update(session
, app
);
815 * Called with session lock held.
817 ssize_t
trace_ust_list_tracker_pids(struct ltt_ust_session
*session
,
820 struct ust_pid_tracker_node
*tracker_node
;
821 struct lttng_ht_iter iter
;
822 unsigned long count
, i
= 0;
827 if (!session
->pid_tracker
.ht
) {
828 /* Tracker disabled. Set first entry to -1. */
829 pids
= zmalloc(sizeof(*pids
));
840 cds_lfht_count_nodes(session
->pid_tracker
.ht
->ht
,
841 &approx
[0], &count
, &approx
[1]);
842 pids
= zmalloc(sizeof(*pids
) * count
);
847 cds_lfht_for_each_entry(session
->pid_tracker
.ht
->ht
,
848 &iter
.iter
, tracker_node
, node
.node
) {
849 pids
[i
++] = tracker_node
->node
.key
;
859 * RCU safe free context structure.
861 static void destroy_context_rcu(struct rcu_head
*head
)
863 struct lttng_ht_node_ulong
*node
=
864 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
865 struct ltt_ust_context
*ctx
=
866 caa_container_of(node
, struct ltt_ust_context
, node
);
872 * Cleanup UST context hash table.
874 static void destroy_contexts(struct lttng_ht
*ht
)
877 struct lttng_ht_node_ulong
*node
;
878 struct lttng_ht_iter iter
;
879 struct ltt_ust_context
*ctx
;
884 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, node
, node
) {
885 /* Remove from ordered list. */
886 ctx
= caa_container_of(node
, struct ltt_ust_context
, node
);
887 cds_list_del(&ctx
->list
);
888 /* Remove from channel's hash table. */
889 ret
= lttng_ht_del(ht
, &iter
);
891 call_rcu(&node
->head
, destroy_context_rcu
);
900 * Cleanup ust event structure.
902 void trace_ust_destroy_event(struct ltt_ust_event
*event
)
906 DBG2("Trace destroy UST event %s", event
->attr
.name
);
907 free(event
->filter_expression
);
909 free(event
->exclusion
);
914 * URCU intermediate call to complete destroy event.
916 static void destroy_event_rcu(struct rcu_head
*head
)
918 struct lttng_ht_node_str
*node
=
919 caa_container_of(head
, struct lttng_ht_node_str
, head
);
920 struct ltt_ust_event
*event
=
921 caa_container_of(node
, struct ltt_ust_event
, node
);
923 trace_ust_destroy_event(event
);
927 * Cleanup UST events hashtable.
929 static void destroy_events(struct lttng_ht
*events
)
932 struct lttng_ht_node_str
*node
;
933 struct lttng_ht_iter iter
;
938 cds_lfht_for_each_entry(events
->ht
, &iter
.iter
, node
, node
) {
939 ret
= lttng_ht_del(events
, &iter
);
941 call_rcu(&node
->head
, destroy_event_rcu
);
945 ht_cleanup_push(events
);
949 * Cleanup ust channel structure.
951 * Should _NOT_ be called with RCU read lock held.
953 static void _trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
957 DBG2("Trace destroy UST channel %s", channel
->name
);
959 /* Destroying all events of the channel */
960 destroy_events(channel
->events
);
961 /* Destroying all context of the channel */
962 destroy_contexts(channel
->ctx
);
968 * URCU intermediate call to complete destroy channel.
970 static void destroy_channel_rcu(struct rcu_head
*head
)
972 struct lttng_ht_node_str
*node
=
973 caa_container_of(head
, struct lttng_ht_node_str
, head
);
974 struct ltt_ust_channel
*channel
=
975 caa_container_of(node
, struct ltt_ust_channel
, node
);
977 _trace_ust_destroy_channel(channel
);
980 void trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
982 call_rcu(&channel
->node
.head
, destroy_channel_rcu
);
986 * Remove an UST channel from a channel HT.
988 void trace_ust_delete_channel(struct lttng_ht
*ht
,
989 struct ltt_ust_channel
*channel
)
992 struct lttng_ht_iter iter
;
997 iter
.iter
.node
= &channel
->node
.node
;
998 ret
= lttng_ht_del(ht
, &iter
);
1003 * Iterate over a hash table containing channels and cleanup safely.
1005 static void destroy_channels(struct lttng_ht
*channels
)
1008 struct lttng_ht_node_str
*node
;
1009 struct lttng_ht_iter iter
;
1015 cds_lfht_for_each_entry(channels
->ht
, &iter
.iter
, node
, node
) {
1016 ret
= lttng_ht_del(channels
, &iter
);
1018 call_rcu(&node
->head
, destroy_channel_rcu
);
1022 ht_cleanup_push(channels
);
1026 * Cleanup UST global domain.
1028 static void destroy_domain_global(struct ltt_ust_domain_global
*dom
)
1032 destroy_channels(dom
->channels
);
1036 * Cleanup ust session structure
1038 * Should *NOT* be called with RCU read-side lock held.
1040 void trace_ust_destroy_session(struct ltt_ust_session
*session
)
1043 struct buffer_reg_uid
*reg
, *sreg
;
1044 struct lttng_ht_iter iter
;
1048 DBG2("Trace UST destroy session %" PRIu64
, session
->id
);
1050 /* Cleaning up UST domain */
1051 destroy_domain_global(&session
->domain_global
);
1054 cds_lfht_for_each_entry(session
->agents
->ht
, &iter
.iter
, agt
, node
.node
) {
1055 int ret
= lttng_ht_del(session
->agents
, &iter
);
1062 ht_cleanup_push(session
->agents
);
1064 /* Cleanup UID buffer registry object(s). */
1065 cds_list_for_each_entry_safe(reg
, sreg
, &session
->buffer_reg_uid_list
,
1067 cds_list_del(®
->lnode
);
1068 buffer_reg_uid_remove(reg
);
1069 buffer_reg_uid_destroy(reg
, session
->consumer
);
1072 consumer_destroy_output(session
->consumer
);
1073 consumer_destroy_output(session
->tmp_consumer
);
1075 fini_pid_tracker(&session
->pid_tracker
);