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
)
314 struct ltt_ust_channel
*luc
;
318 luc
= zmalloc(sizeof(struct ltt_ust_channel
));
320 PERROR("ltt_ust_channel zmalloc");
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
)
380 struct ltt_ust_event
*lue
;
384 lue
= zmalloc(sizeof(struct ltt_ust_event
));
386 PERROR("ust event zmalloc");
391 case LTTNG_EVENT_PROBE
:
392 lue
->attr
.instrumentation
= LTTNG_UST_PROBE
;
394 case LTTNG_EVENT_FUNCTION
:
395 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
397 case LTTNG_EVENT_FUNCTION_ENTRY
:
398 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
400 case LTTNG_EVENT_TRACEPOINT
:
401 lue
->attr
.instrumentation
= LTTNG_UST_TRACEPOINT
;
404 ERR("Unknown ust instrumentation type (%d)", ev
->type
);
405 goto error_free_event
;
408 /* Copy event name */
409 strncpy(lue
->attr
.name
, ev
->name
, LTTNG_UST_SYM_NAME_LEN
);
410 lue
->attr
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
412 switch (ev
->loglevel_type
) {
413 case LTTNG_EVENT_LOGLEVEL_ALL
:
414 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_ALL
;
415 lue
->attr
.loglevel
= -1; /* Force to -1 */
417 case LTTNG_EVENT_LOGLEVEL_RANGE
:
418 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_RANGE
;
419 lue
->attr
.loglevel
= ev
->loglevel
;
421 case LTTNG_EVENT_LOGLEVEL_SINGLE
:
422 lue
->attr
.loglevel_type
= LTTNG_UST_LOGLEVEL_SINGLE
;
423 lue
->attr
.loglevel
= ev
->loglevel
;
426 ERR("Unknown ust loglevel type (%d)", ev
->loglevel_type
);
427 goto error_free_event
;
431 lue
->filter_expression
= filter_expression
;
432 lue
->filter
= (struct lttng_ust_filter_bytecode
*) filter
;
433 lue
->exclusion
= (struct lttng_event_exclusion
*) exclusion
;
436 lttng_ht_node_init_str(&lue
->node
, lue
->attr
.name
);
438 DBG2("Trace UST event %s, loglevel (%d,%d) created",
439 lue
->attr
.name
, lue
->attr
.loglevel_type
,
447 free(filter_expression
);
454 int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type
)
459 case LTTNG_EVENT_CONTEXT_VTID
:
460 utype
= LTTNG_UST_CONTEXT_VTID
;
462 case LTTNG_EVENT_CONTEXT_VPID
:
463 utype
= LTTNG_UST_CONTEXT_VPID
;
465 case LTTNG_EVENT_CONTEXT_PTHREAD_ID
:
466 utype
= LTTNG_UST_CONTEXT_PTHREAD_ID
;
468 case LTTNG_EVENT_CONTEXT_PROCNAME
:
469 utype
= LTTNG_UST_CONTEXT_PROCNAME
;
471 case LTTNG_EVENT_CONTEXT_IP
:
472 utype
= LTTNG_UST_CONTEXT_IP
;
474 case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER
:
475 if (!ustctl_has_perf_counters()) {
477 WARN("Perf counters not implemented in UST");
479 utype
= LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
;
483 ERR("Invalid UST context");
491 * Return 1 if contexts match, 0 otherwise.
493 int trace_ust_match_context(struct ltt_ust_context
*uctx
,
494 struct lttng_event_context
*ctx
)
498 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
502 if (uctx
->ctx
.ctx
!= utype
) {
506 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
507 if (uctx
->ctx
.u
.perf_counter
.type
508 != ctx
->u
.perf_counter
.type
) {
511 if (uctx
->ctx
.u
.perf_counter
.config
512 != ctx
->u
.perf_counter
.config
) {
515 if (strncmp(uctx
->ctx
.u
.perf_counter
.name
,
516 ctx
->u
.perf_counter
.name
,
517 LTTNG_UST_SYM_NAME_LEN
)) {
529 * Allocate and initialize an UST context.
531 * Return pointer to structure or NULL.
533 struct ltt_ust_context
*trace_ust_create_context(
534 struct lttng_event_context
*ctx
)
536 struct ltt_ust_context
*uctx
;
541 utype
= trace_ust_context_type_event_to_ust(ctx
->ctx
);
546 uctx
= zmalloc(sizeof(struct ltt_ust_context
));
548 PERROR("zmalloc ltt_ust_context");
552 uctx
->ctx
.ctx
= (enum lttng_ust_context_type
) utype
;
554 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
555 uctx
->ctx
.u
.perf_counter
.type
= ctx
->u
.perf_counter
.type
;
556 uctx
->ctx
.u
.perf_counter
.config
= ctx
->u
.perf_counter
.config
;
557 strncpy(uctx
->ctx
.u
.perf_counter
.name
, ctx
->u
.perf_counter
.name
,
558 LTTNG_UST_SYM_NAME_LEN
);
559 uctx
->ctx
.u
.perf_counter
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
564 lttng_ht_node_init_ulong(&uctx
->node
, (unsigned long) uctx
->ctx
.ctx
);
573 void destroy_pid_tracker_node_rcu(struct rcu_head
*head
)
575 struct ust_pid_tracker_node
*tracker_node
=
576 caa_container_of(head
, struct ust_pid_tracker_node
, node
.head
);
581 void destroy_pid_tracker_node(struct ust_pid_tracker_node
*tracker_node
)
584 call_rcu(&tracker_node
->node
.head
, destroy_pid_tracker_node_rcu
);
588 int init_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
592 pid_tracker
->ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
593 if (!pid_tracker
->ht
) {
603 * Teardown pid tracker content, but don't free pid_tracker object.
606 void fini_pid_tracker(struct ust_pid_tracker
*pid_tracker
)
608 struct ust_pid_tracker_node
*tracker_node
;
609 struct lttng_ht_iter iter
;
611 if (!pid_tracker
->ht
) {
615 cds_lfht_for_each_entry(pid_tracker
->ht
->ht
,
616 &iter
.iter
, tracker_node
, node
.node
) {
617 int ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
620 destroy_pid_tracker_node(tracker_node
);
623 ht_cleanup_push(pid_tracker
->ht
);
624 pid_tracker
->ht
= NULL
;
628 struct ust_pid_tracker_node
*pid_tracker_lookup(
629 struct ust_pid_tracker
*pid_tracker
, int pid
,
630 struct lttng_ht_iter
*iter
)
632 unsigned long _pid
= (unsigned long) pid
;
633 struct lttng_ht_node_ulong
*node
;
635 lttng_ht_lookup(pid_tracker
->ht
, (void *) _pid
, iter
);
636 node
= lttng_ht_iter_get_node_ulong(iter
);
638 return caa_container_of(node
, struct ust_pid_tracker_node
,
646 int pid_tracker_add_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
648 int retval
= LTTNG_OK
;
649 struct ust_pid_tracker_node
*tracker_node
;
650 struct lttng_ht_iter iter
;
653 retval
= LTTNG_ERR_INVALID
;
656 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
658 /* Already exists. */
659 retval
= LTTNG_ERR_INVALID
;
662 tracker_node
= zmalloc(sizeof(*tracker_node
));
664 retval
= LTTNG_ERR_NOMEM
;
667 lttng_ht_node_init_ulong(&tracker_node
->node
, (unsigned long) pid
);
668 lttng_ht_add_unique_ulong(pid_tracker
->ht
, &tracker_node
->node
);
674 int pid_tracker_del_pid(struct ust_pid_tracker
*pid_tracker
, int pid
)
676 int retval
= LTTNG_OK
, ret
;
677 struct ust_pid_tracker_node
*tracker_node
;
678 struct lttng_ht_iter iter
;
681 retval
= LTTNG_ERR_INVALID
;
684 tracker_node
= pid_tracker_lookup(pid_tracker
, pid
, &iter
);
687 retval
= LTTNG_ERR_INVALID
;
690 ret
= lttng_ht_del(pid_tracker
->ht
, &iter
);
693 destroy_pid_tracker_node(tracker_node
);
699 * The session lock is held when calling this function.
701 int trace_ust_pid_tracker_lookup(struct ltt_ust_session
*session
, int pid
)
703 struct lttng_ht_iter iter
;
705 if (!session
->pid_tracker
.ht
) {
708 if (pid_tracker_lookup(&session
->pid_tracker
, pid
, &iter
)) {
715 * Called with the session lock held.
717 int trace_ust_track_pid(struct ltt_ust_session
*session
, int pid
)
719 int retval
= LTTNG_OK
;
722 /* Track all pids: destroy tracker if exists. */
723 if (session
->pid_tracker
.ht
) {
724 fini_pid_tracker(&session
->pid_tracker
);
725 /* Ensure all apps have session. */
726 ust_app_global_update_all(session
);
731 if (!session
->pid_tracker
.ht
) {
732 /* Create tracker. */
733 if (init_pid_tracker(&session
->pid_tracker
)) {
734 ERR("Error initializing PID tracker");
735 retval
= LTTNG_ERR_NOMEM
;
738 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
739 if (ret
!= LTTNG_OK
) {
741 fini_pid_tracker(&session
->pid_tracker
);
744 /* Remove all apps from session except pid. */
745 ust_app_global_update_all(session
);
749 ret
= pid_tracker_add_pid(&session
->pid_tracker
, pid
);
750 if (ret
!= LTTNG_OK
) {
754 /* Add session to application */
755 app
= ust_app_find_by_pid(pid
);
757 ust_app_global_update(session
, app
);
766 * Called with the session lock held.
768 int trace_ust_untrack_pid(struct ltt_ust_session
*session
, int pid
)
770 int retval
= LTTNG_OK
;
773 /* Create empty tracker, replace old tracker. */
774 struct ust_pid_tracker tmp_tracker
;
776 tmp_tracker
= session
->pid_tracker
;
777 if (init_pid_tracker(&session
->pid_tracker
)) {
778 ERR("Error initializing PID tracker");
779 retval
= LTTNG_ERR_NOMEM
;
780 /* Rollback operation. */
781 session
->pid_tracker
= tmp_tracker
;
784 fini_pid_tracker(&tmp_tracker
);
786 /* Remove session from all applications */
787 ust_app_global_update_all(session
);
792 if (!session
->pid_tracker
.ht
) {
793 retval
= LTTNG_ERR_INVALID
;
796 /* Remove PID from tracker */
797 ret
= pid_tracker_del_pid(&session
->pid_tracker
, pid
);
798 if (ret
!= LTTNG_OK
) {
802 /* Remove session from application. */
803 app
= ust_app_find_by_pid(pid
);
805 ust_app_global_update(session
, app
);
813 * Called with session lock held.
815 ssize_t
trace_ust_list_tracker_pids(struct ltt_ust_session
*session
,
818 struct ust_pid_tracker_node
*tracker_node
;
819 struct lttng_ht_iter iter
;
820 unsigned long count
, i
= 0;
825 if (!session
->pid_tracker
.ht
) {
826 /* Tracker disabled. Set first entry to -1. */
827 pids
= zmalloc(sizeof(*pids
));
838 cds_lfht_count_nodes(session
->pid_tracker
.ht
->ht
,
839 &approx
[0], &count
, &approx
[1]);
840 pids
= zmalloc(sizeof(*pids
) * count
);
845 cds_lfht_for_each_entry(session
->pid_tracker
.ht
->ht
,
846 &iter
.iter
, tracker_node
, node
.node
) {
847 pids
[i
++] = tracker_node
->node
.key
;
857 * RCU safe free context structure.
859 static void destroy_context_rcu(struct rcu_head
*head
)
861 struct lttng_ht_node_ulong
*node
=
862 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
863 struct ltt_ust_context
*ctx
=
864 caa_container_of(node
, struct ltt_ust_context
, node
);
870 * Cleanup UST context hash table.
872 static void destroy_contexts(struct lttng_ht
*ht
)
875 struct lttng_ht_node_ulong
*node
;
876 struct lttng_ht_iter iter
;
877 struct ltt_ust_context
*ctx
;
882 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, node
, node
) {
883 /* Remove from ordered list. */
884 ctx
= caa_container_of(node
, struct ltt_ust_context
, node
);
885 cds_list_del(&ctx
->list
);
886 /* Remove from channel's hash table. */
887 ret
= lttng_ht_del(ht
, &iter
);
889 call_rcu(&node
->head
, destroy_context_rcu
);
898 * Cleanup ust event structure.
900 void trace_ust_destroy_event(struct ltt_ust_event
*event
)
904 DBG2("Trace destroy UST event %s", event
->attr
.name
);
905 free(event
->filter_expression
);
907 free(event
->exclusion
);
912 * URCU intermediate call to complete destroy event.
914 static void destroy_event_rcu(struct rcu_head
*head
)
916 struct lttng_ht_node_str
*node
=
917 caa_container_of(head
, struct lttng_ht_node_str
, head
);
918 struct ltt_ust_event
*event
=
919 caa_container_of(node
, struct ltt_ust_event
, node
);
921 trace_ust_destroy_event(event
);
925 * Cleanup UST events hashtable.
927 static void destroy_events(struct lttng_ht
*events
)
930 struct lttng_ht_node_str
*node
;
931 struct lttng_ht_iter iter
;
936 cds_lfht_for_each_entry(events
->ht
, &iter
.iter
, node
, node
) {
937 ret
= lttng_ht_del(events
, &iter
);
939 call_rcu(&node
->head
, destroy_event_rcu
);
943 ht_cleanup_push(events
);
947 * Cleanup ust channel structure.
949 * Should _NOT_ be called with RCU read lock held.
951 static void _trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
955 DBG2("Trace destroy UST channel %s", channel
->name
);
957 /* Destroying all events of the channel */
958 destroy_events(channel
->events
);
959 /* Destroying all context of the channel */
960 destroy_contexts(channel
->ctx
);
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 call_rcu(&channel
->node
.head
, destroy_channel_rcu
);
984 * Remove an UST channel from a channel HT.
986 void trace_ust_delete_channel(struct lttng_ht
*ht
,
987 struct ltt_ust_channel
*channel
)
990 struct lttng_ht_iter iter
;
995 iter
.iter
.node
= &channel
->node
.node
;
996 ret
= lttng_ht_del(ht
, &iter
);
1001 * Iterate over a hash table containing channels and cleanup safely.
1003 static void destroy_channels(struct lttng_ht
*channels
)
1006 struct lttng_ht_node_str
*node
;
1007 struct lttng_ht_iter iter
;
1013 cds_lfht_for_each_entry(channels
->ht
, &iter
.iter
, node
, node
) {
1014 ret
= lttng_ht_del(channels
, &iter
);
1016 call_rcu(&node
->head
, destroy_channel_rcu
);
1020 ht_cleanup_push(channels
);
1024 * Cleanup UST global domain.
1026 static void destroy_domain_global(struct ltt_ust_domain_global
*dom
)
1030 destroy_channels(dom
->channels
);
1034 * Cleanup ust session structure
1036 * Should *NOT* be called with RCU read-side lock held.
1038 void trace_ust_destroy_session(struct ltt_ust_session
*session
)
1041 struct buffer_reg_uid
*reg
, *sreg
;
1042 struct lttng_ht_iter iter
;
1046 DBG2("Trace UST destroy session %" PRIu64
, session
->id
);
1048 /* Cleaning up UST domain */
1049 destroy_domain_global(&session
->domain_global
);
1052 cds_lfht_for_each_entry(session
->agents
->ht
, &iter
.iter
, agt
, node
.node
) {
1053 int ret
= lttng_ht_del(session
->agents
, &iter
);
1060 ht_cleanup_push(session
->agents
);
1062 /* Cleanup UID buffer registry object(s). */
1063 cds_list_for_each_entry_safe(reg
, sreg
, &session
->buffer_reg_uid_list
,
1065 cds_list_del(®
->lnode
);
1066 buffer_reg_uid_remove(reg
);
1067 buffer_reg_uid_destroy(reg
, session
->consumer
);
1070 consumer_destroy_output(session
->consumer
);
1071 consumer_destroy_output(session
->tmp_consumer
);
1073 fini_pid_tracker(&session
->pid_tracker
);