4 * Holds LTTng per-session event registry.
6 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
38 #include <lttng/ust-endian.h>
41 #include <urcu/arch.h>
42 #include <urcu/compiler.h>
43 #include <urcu/hlist.h>
44 #include <urcu/list.h>
45 #include <urcu/uatomic.h>
47 #include <lttng/tracepoint.h>
48 #include <lttng/ust-events.h>
50 #include <usterr-signal-safe.h>
52 #include <lttng/ust-ctl.h>
55 #include <lttng/ust-dynamic-type.h>
56 #include <lttng/ust-context-provider.h>
59 #include "lttng-ust-uuid.h"
61 #include "tracepoint-internal.h"
62 #include "string-utils.h"
63 #include "lttng-bytecode.h"
64 #include "lttng-tracer.h"
65 #include "lttng-tracer-core.h"
66 #include "lttng-ust-statedump.h"
67 #include "context-internal.h"
68 #include "ust-events-internal.h"
70 #include "../libringbuffer/shm.h"
72 #include <lttng/ust-abi.h>
75 * All operations within this file are called by the communication
76 * thread, under ust_lock protection.
79 static CDS_LIST_HEAD(sessions
);
80 static CDS_LIST_HEAD(trigger_groups
);
82 struct cds_list_head
*_lttng_get_sessions(void)
87 static void _lttng_event_destroy(struct lttng_event
*event
);
88 static void _lttng_trigger_destroy(struct lttng_trigger
*trigger
);
89 static void _lttng_enum_destroy(struct lttng_enum
*_enum
);
92 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
94 void lttng_session_sync_event_enablers(struct lttng_session
*session
);
96 void lttng_trigger_group_sync_enablers(struct lttng_trigger_group
*trigger_group
);
98 void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
101 * Called with ust lock held.
103 int lttng_session_active(void)
105 struct lttng_session
*iter
;
107 cds_list_for_each_entry(iter
, &sessions
, node
) {
115 int lttng_loglevel_match(int loglevel
,
116 unsigned int has_loglevel
,
117 enum lttng_ust_loglevel_type req_type
,
121 loglevel
= TRACE_DEFAULT
;
123 case LTTNG_UST_LOGLEVEL_RANGE
:
124 if (loglevel
<= req_loglevel
125 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
129 case LTTNG_UST_LOGLEVEL_SINGLE
:
130 if (loglevel
== req_loglevel
131 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
135 case LTTNG_UST_LOGLEVEL_ALL
:
137 if (loglevel
<= TRACE_DEBUG
)
144 void synchronize_trace(void)
149 struct lttng_session
*lttng_session_create(void)
151 struct lttng_session
*session
;
154 session
= zmalloc(sizeof(struct lttng_session
));
157 if (lttng_context_init_all(&session
->ctx
)) {
161 CDS_INIT_LIST_HEAD(&session
->chan_head
);
162 CDS_INIT_LIST_HEAD(&session
->events_head
);
163 CDS_INIT_LIST_HEAD(&session
->enums_head
);
164 CDS_INIT_LIST_HEAD(&session
->enablers_head
);
165 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
166 CDS_INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
167 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
168 CDS_INIT_HLIST_HEAD(&session
->enums_ht
.table
[i
]);
169 cds_list_add(&session
->node
, &sessions
);
173 struct lttng_trigger_group
*lttng_trigger_group_create(void)
175 struct lttng_trigger_group
*trigger_group
;
178 trigger_group
= zmalloc(sizeof(struct lttng_trigger_group
));
182 /* Add all contexts. */
183 if (lttng_context_init_all(&trigger_group
->ctx
)) {
188 CDS_INIT_LIST_HEAD(&trigger_group
->enablers_head
);
189 CDS_INIT_LIST_HEAD(&trigger_group
->triggers_head
);
190 for (i
= 0; i
< LTTNG_UST_TRIGGER_HT_SIZE
; i
++)
191 CDS_INIT_HLIST_HEAD(&trigger_group
->triggers_ht
.table
[i
]);
193 cds_list_add(&trigger_group
->node
, &trigger_groups
);
195 return trigger_group
;
199 * Only used internally at session destruction.
202 void _lttng_channel_unmap(struct lttng_channel
*lttng_chan
)
204 struct channel
*chan
;
205 struct lttng_ust_shm_handle
*handle
;
207 cds_list_del(<tng_chan
->node
);
208 lttng_destroy_context(lttng_chan
->ctx
);
209 chan
= lttng_chan
->chan
;
210 handle
= lttng_chan
->handle
;
212 * note: lttng_chan is private data contained within handle. It
213 * will be freed along with the handle.
215 channel_destroy(chan
, handle
, 0);
219 void register_event(struct lttng_event
*event
)
222 const struct lttng_event_desc
*desc
;
224 assert(event
->registered
== 0);
226 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
227 desc
->probe_callback
,
228 event
, desc
->signature
);
231 event
->registered
= 1;
235 void register_trigger(struct lttng_trigger
*trigger
)
238 const struct lttng_event_desc
*desc
;
240 assert(trigger
->registered
== 0);
241 desc
= trigger
->desc
;
242 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
243 desc
->u
.ext
.trigger_callback
, trigger
, desc
->signature
);
246 trigger
->registered
= 1;
250 void unregister_event(struct lttng_event
*event
)
253 const struct lttng_event_desc
*desc
;
255 assert(event
->registered
== 1);
257 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
258 desc
->probe_callback
,
262 event
->registered
= 0;
266 void unregister_trigger(struct lttng_trigger
*trigger
)
269 const struct lttng_event_desc
*desc
;
271 assert(trigger
->registered
== 1);
272 desc
= trigger
->desc
;
273 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
274 desc
->u
.ext
.trigger_callback
, trigger
);
277 trigger
->registered
= 0;
281 * Only used internally at session destruction.
284 void _lttng_event_unregister(struct lttng_event
*event
)
286 if (event
->registered
)
287 unregister_event(event
);
291 * Only used internally at session destruction.
294 void _lttng_trigger_unregister(struct lttng_trigger
*trigger
)
296 if (trigger
->registered
)
297 unregister_trigger(trigger
);
300 void lttng_session_destroy(struct lttng_session
*session
)
302 struct lttng_channel
*chan
, *tmpchan
;
303 struct lttng_event
*event
, *tmpevent
;
304 struct lttng_enum
*_enum
, *tmp_enum
;
305 struct lttng_event_enabler
*event_enabler
, *event_tmpenabler
;
307 CMM_ACCESS_ONCE(session
->active
) = 0;
308 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
309 _lttng_event_unregister(event
);
311 synchronize_trace(); /* Wait for in-flight events to complete */
312 __tracepoint_probe_prune_release_queue();
313 cds_list_for_each_entry_safe(event_enabler
, event_tmpenabler
,
314 &session
->enablers_head
, node
)
315 lttng_event_enabler_destroy(event_enabler
);
316 cds_list_for_each_entry_safe(event
, tmpevent
,
317 &session
->events_head
, node
)
318 _lttng_event_destroy(event
);
319 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
320 &session
->enums_head
, node
)
321 _lttng_enum_destroy(_enum
);
322 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->chan_head
, node
)
323 _lttng_channel_unmap(chan
);
324 cds_list_del(&session
->node
);
325 lttng_destroy_context(session
->ctx
);
329 void lttng_trigger_group_destroy(
330 struct lttng_trigger_group
*trigger_group
)
333 struct lttng_trigger_enabler
*trigger_enabler
, *tmptrigger_enabler
;
334 struct lttng_trigger
*trigger
, *tmptrigger
;
336 if (!trigger_group
) {
340 cds_list_for_each_entry(trigger
, &trigger_group
->triggers_head
, node
)
341 _lttng_trigger_unregister(trigger
);
345 cds_list_for_each_entry_safe(trigger_enabler
, tmptrigger_enabler
,
346 &trigger_group
->enablers_head
, node
)
347 lttng_trigger_enabler_destroy(trigger_enabler
);
349 cds_list_for_each_entry_safe(trigger
, tmptrigger
,
350 &trigger_group
->triggers_head
, node
)
351 _lttng_trigger_destroy(trigger
);
353 /* Close the notification fd to the listener of triggers. */
355 lttng_ust_lock_fd_tracker();
356 close_ret
= close(trigger_group
->notification_fd
);
358 lttng_ust_delete_fd_from_tracker(trigger_group
->notification_fd
);
363 lttng_ust_unlock_fd_tracker();
365 cds_list_del(&trigger_group
->node
);
371 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
373 struct lttng_ust_bytecode_node
*filter_node
, *tmp_filter_node
;
374 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
380 /* Destroy filter bytecode */
381 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
382 &enabler
->filter_bytecode_head
, node
) {
386 /* Destroy excluders */
387 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
388 &enabler
->excluder_head
, node
) {
393 void lttng_trigger_enabler_destroy(struct lttng_trigger_enabler
*trigger_enabler
)
395 if (!trigger_enabler
) {
399 cds_list_del(&trigger_enabler
->node
);
401 lttng_enabler_destroy(lttng_trigger_enabler_as_enabler(trigger_enabler
));
403 free(trigger_enabler
);
407 int lttng_enum_create(const struct lttng_enum_desc
*desc
,
408 struct lttng_session
*session
)
410 const char *enum_name
= desc
->name
;
411 struct lttng_enum
*_enum
;
412 struct cds_hlist_head
*head
;
414 size_t name_len
= strlen(enum_name
);
418 /* Check if this enum is already registered for this session. */
419 hash
= jhash(enum_name
, name_len
, 0);
420 head
= &session
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
422 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
428 notify_socket
= lttng_get_notify_socket(session
->owner
);
429 if (notify_socket
< 0) {
434 _enum
= zmalloc(sizeof(*_enum
));
439 _enum
->session
= session
;
442 ret
= ustcomm_register_enum(notify_socket
,
449 DBG("Error (%d) registering enumeration to sessiond", ret
);
450 goto sessiond_register_error
;
452 cds_list_add(&_enum
->node
, &session
->enums_head
);
453 cds_hlist_add_head(&_enum
->hlist
, head
);
456 sessiond_register_error
:
465 int lttng_create_enum_check(const struct lttng_type
*type
,
466 struct lttng_session
*session
)
468 switch (type
->atype
) {
471 const struct lttng_enum_desc
*enum_desc
;
474 enum_desc
= type
->u
.legacy
.basic
.enumeration
.desc
;
475 ret
= lttng_enum_create(enum_desc
, session
);
476 if (ret
&& ret
!= -EEXIST
) {
477 DBG("Unable to create enum error: (%d)", ret
);
482 case atype_enum_nestable
:
484 const struct lttng_enum_desc
*enum_desc
;
487 enum_desc
= type
->u
.enum_nestable
.desc
;
488 ret
= lttng_enum_create(enum_desc
, session
);
489 if (ret
&& ret
!= -EEXIST
) {
490 DBG("Unable to create enum error: (%d)", ret
);
497 const struct lttng_event_field
*tag_field_generic
;
498 const struct lttng_enum_desc
*enum_desc
;
501 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
502 enum_desc
= tag_field_generic
->type
.u
.enum_nestable
.desc
;
503 ret
= lttng_enum_create(enum_desc
, session
);
504 if (ret
&& ret
!= -EEXIST
) {
505 DBG("Unable to create enum error: (%d)", ret
);
511 /* TODO: nested types when they become supported. */
518 int lttng_create_all_event_enums(size_t nr_fields
,
519 const struct lttng_event_field
*event_fields
,
520 struct lttng_session
*session
)
525 /* For each field, ensure enum is part of the session. */
526 for (i
= 0; i
< nr_fields
; i
++) {
527 const struct lttng_type
*type
= &event_fields
[i
].type
;
529 ret
= lttng_create_enum_check(type
, session
);
537 int lttng_create_all_ctx_enums(size_t nr_fields
,
538 const struct lttng_ctx_field
*ctx_fields
,
539 struct lttng_session
*session
)
544 /* For each field, ensure enum is part of the session. */
545 for (i
= 0; i
< nr_fields
; i
++) {
546 const struct lttng_type
*type
= &ctx_fields
[i
].event_field
.type
;
548 ret
= lttng_create_enum_check(type
, session
);
556 * Ensure that a state-dump will be performed for this session at the end
557 * of the current handle_message().
559 int lttng_session_statedump(struct lttng_session
*session
)
561 session
->statedump_pending
= 1;
562 lttng_ust_sockinfo_session_enabled(session
->owner
);
566 int lttng_session_enable(struct lttng_session
*session
)
569 struct lttng_channel
*chan
;
572 if (session
->active
) {
577 notify_socket
= lttng_get_notify_socket(session
->owner
);
578 if (notify_socket
< 0)
579 return notify_socket
;
581 /* Set transient enabler state to "enabled" */
584 /* We need to sync enablers with session before activation. */
585 lttng_session_sync_event_enablers(session
);
588 * Snapshot the number of events per channel to know the type of header
591 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
592 const struct lttng_ctx
*ctx
;
593 const struct lttng_ctx_field
*fields
= NULL
;
594 size_t nr_fields
= 0;
597 /* don't change it if session stop/restart */
598 if (chan
->header_type
)
602 nr_fields
= ctx
->nr_fields
;
603 fields
= ctx
->fields
;
604 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
607 DBG("Error (%d) adding enum to session", ret
);
611 ret
= ustcomm_register_channel(notify_socket
,
620 DBG("Error (%d) registering channel to sessiond", ret
);
623 if (chan_id
!= chan
->id
) {
624 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
630 /* Set atomically the state to "active" */
631 CMM_ACCESS_ONCE(session
->active
) = 1;
632 CMM_ACCESS_ONCE(session
->been_active
) = 1;
634 ret
= lttng_session_statedump(session
);
641 int lttng_session_disable(struct lttng_session
*session
)
645 if (!session
->active
) {
649 /* Set atomically the state to "inactive" */
650 CMM_ACCESS_ONCE(session
->active
) = 0;
652 /* Set transient enabler state to "disabled" */
654 lttng_session_sync_event_enablers(session
);
659 int lttng_channel_enable(struct lttng_channel
*channel
)
663 if (channel
->enabled
) {
667 /* Set transient enabler state to "enabled" */
669 lttng_session_sync_event_enablers(channel
->session
);
670 /* Set atomically the state to "enabled" */
671 CMM_ACCESS_ONCE(channel
->enabled
) = 1;
676 int lttng_channel_disable(struct lttng_channel
*channel
)
680 if (!channel
->enabled
) {
684 /* Set atomically the state to "disabled" */
685 CMM_ACCESS_ONCE(channel
->enabled
) = 0;
686 /* Set transient enabler state to "enabled" */
688 lttng_session_sync_event_enablers(channel
->session
);
694 struct cds_hlist_head
*borrow_hash_table_bucket(
695 struct cds_hlist_head
*hash_table
,
696 unsigned int hash_table_size
,
697 const struct lttng_event_desc
*desc
)
699 const char *event_name
;
703 event_name
= desc
->name
;
704 name_len
= strlen(event_name
);
706 hash
= jhash(event_name
, name_len
, 0);
707 return &hash_table
[hash
& (hash_table_size
- 1)];
711 * Supports event creation while tracing session is active.
714 int lttng_event_create(const struct lttng_event_desc
*desc
,
715 struct lttng_channel
*chan
)
717 struct lttng_event
*event
;
718 struct lttng_session
*session
= chan
->session
;
719 struct cds_hlist_head
*head
;
721 int notify_socket
, loglevel
;
724 head
= borrow_hash_table_bucket(chan
->session
->events_ht
.table
,
725 LTTNG_UST_EVENT_HT_SIZE
, desc
);
727 notify_socket
= lttng_get_notify_socket(session
->owner
);
728 if (notify_socket
< 0) {
733 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
736 DBG("Error (%d) adding enum to session", ret
);
737 goto create_enum_error
;
741 * Check if loglevel match. Refuse to connect event if not.
743 event
= zmalloc(sizeof(struct lttng_event
));
750 /* Event will be enabled by enabler sync. */
752 event
->registered
= 0;
753 CDS_INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
754 CDS_INIT_LIST_HEAD(&event
->enablers_ref_head
);
758 loglevel
= *(*event
->desc
->loglevel
);
760 loglevel
= TRACE_DEFAULT
;
761 if (desc
->u
.ext
.model_emf_uri
)
762 uri
= *(desc
->u
.ext
.model_emf_uri
);
766 /* Fetch event ID from sessiond */
767 ret
= ustcomm_register_event(notify_socket
,
779 DBG("Error (%d) registering event to sessiond", ret
);
780 goto sessiond_register_error
;
783 cds_list_add(&event
->node
, &chan
->session
->events_head
);
784 cds_hlist_add_head(&event
->hlist
, head
);
787 sessiond_register_error
:
796 int lttng_trigger_create(const struct lttng_event_desc
*desc
,
797 uint64_t id
, struct lttng_trigger_group
*trigger_group
)
799 struct lttng_trigger
*trigger
;
800 struct cds_hlist_head
*head
;
804 * Get the hashtable bucket the created lttng_trigger object should be
807 head
= borrow_hash_table_bucket(trigger_group
->triggers_ht
.table
,
808 LTTNG_UST_TRIGGER_HT_SIZE
, desc
);
810 trigger
= zmalloc(sizeof(struct lttng_trigger
));
816 trigger
->group
= trigger_group
;
819 /* Trigger will be enabled by enabler sync. */
820 trigger
->enabled
= 0;
821 trigger
->registered
= 0;
823 CDS_INIT_LIST_HEAD(&trigger
->filter_bytecode_runtime_head
);
824 CDS_INIT_LIST_HEAD(&trigger
->capture_bytecode_runtime_head
);
825 CDS_INIT_LIST_HEAD(&trigger
->enablers_ref_head
);
826 trigger
->desc
= desc
;
828 cds_list_add(&trigger
->node
, &trigger_group
->triggers_head
);
829 cds_hlist_add_head(&trigger
->hlist
, head
);
838 void _lttng_trigger_destroy(struct lttng_trigger
*trigger
)
840 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
842 /* Remove from trigger list. */
843 cds_list_del(&trigger
->node
);
844 /* Remove from trigger hash table. */
845 cds_hlist_del(&trigger
->hlist
);
847 lttng_free_trigger_filter_runtime(trigger
);
849 /* Free trigger enabler refs */
850 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
851 &trigger
->enablers_ref_head
, node
)
857 int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc
*desc
,
858 struct lttng_enabler
*enabler
)
861 unsigned int has_loglevel
= 0;
863 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_STAR_GLOB
);
864 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
865 desc
->name
, SIZE_MAX
))
867 if (desc
->loglevel
) {
868 loglevel
= *(*desc
->loglevel
);
871 if (!lttng_loglevel_match(loglevel
,
873 enabler
->event_param
.loglevel_type
,
874 enabler
->event_param
.loglevel
))
880 int lttng_desc_match_event_enabler(const struct lttng_event_desc
*desc
,
881 struct lttng_enabler
*enabler
)
884 unsigned int has_loglevel
= 0;
886 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_EVENT
);
887 if (strcmp(desc
->name
, enabler
->event_param
.name
))
889 if (desc
->loglevel
) {
890 loglevel
= *(*desc
->loglevel
);
893 if (!lttng_loglevel_match(loglevel
,
895 enabler
->event_param
.loglevel_type
,
896 enabler
->event_param
.loglevel
))
902 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
903 struct lttng_enabler
*enabler
)
905 switch (enabler
->format_type
) {
906 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
908 struct lttng_ust_excluder_node
*excluder
;
910 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
915 * If the matching event matches with an excluder,
916 * return 'does not match'
918 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
921 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
925 excluder_name
= (char *) (excluder
->excluder
.names
)
926 + count
* LTTNG_UST_SYM_NAME_LEN
;
927 len
= strnlen(excluder_name
, LTTNG_UST_SYM_NAME_LEN
);
928 if (len
> 0 && strutils_star_glob_match(excluder_name
, len
, desc
->name
, SIZE_MAX
))
934 case LTTNG_ENABLER_FORMAT_EVENT
:
935 return lttng_desc_match_event_enabler(desc
, enabler
);
942 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
943 struct lttng_event
*event
)
945 if (lttng_desc_match_enabler(event
->desc
,
946 lttng_event_enabler_as_enabler(event_enabler
))
947 && event
->chan
== event_enabler
->chan
)
954 int lttng_trigger_enabler_match_trigger(
955 struct lttng_trigger_enabler
*trigger_enabler
,
956 struct lttng_trigger
*trigger
)
958 int desc_matches
= lttng_desc_match_enabler(trigger
->desc
,
959 lttng_trigger_enabler_as_enabler(trigger_enabler
));
961 if (desc_matches
&& trigger
->group
== trigger_enabler
->group
&&
962 trigger
->id
== trigger_enabler
->id
)
969 struct lttng_enabler_ref
*lttng_enabler_ref(
970 struct cds_list_head
*enabler_ref_list
,
971 struct lttng_enabler
*enabler
)
973 struct lttng_enabler_ref
*enabler_ref
;
975 cds_list_for_each_entry(enabler_ref
, enabler_ref_list
, node
) {
976 if (enabler_ref
->ref
== enabler
)
983 * Create struct lttng_event if it is missing and present in the list of
987 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
989 struct lttng_session
*session
= event_enabler
->chan
->session
;
990 struct lttng_probe_desc
*probe_desc
;
991 const struct lttng_event_desc
*desc
;
992 struct lttng_event
*event
;
994 struct cds_list_head
*probe_list
;
996 probe_list
= lttng_get_probe_list_head();
998 * For each probe event, if we find that a probe event matches
999 * our enabler, create an associated lttng_event if not
1002 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1003 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1006 struct cds_hlist_head
*head
;
1007 struct cds_hlist_node
*node
;
1009 desc
= probe_desc
->event_desc
[i
];
1010 if (!lttng_desc_match_enabler(desc
,
1011 lttng_event_enabler_as_enabler(event_enabler
)))
1014 head
= borrow_hash_table_bucket(
1015 session
->events_ht
.table
,
1016 LTTNG_UST_EVENT_HT_SIZE
, desc
);
1018 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
1019 if (event
->desc
== desc
1020 && event
->chan
== event_enabler
->chan
) {
1029 * We need to create an event for this
1032 ret
= lttng_event_create(probe_desc
->event_desc
[i
],
1033 event_enabler
->chan
);
1035 DBG("Unable to create event %s, error %d\n",
1036 probe_desc
->event_desc
[i
]->name
, ret
);
1043 void probe_provider_event_for_each(struct lttng_probe_desc
*provider_desc
,
1044 void (*event_func
)(struct lttng_session
*session
,
1045 struct lttng_event
*event
),
1046 void (*trigger_func
)(struct lttng_trigger
*trigger
))
1048 struct cds_hlist_node
*node
, *tmp_node
;
1049 struct cds_list_head
*sessionsp
;
1052 /* Get handle on list of sessions. */
1053 sessionsp
= _lttng_get_sessions();
1056 * Iterate over all events in the probe provider descriptions and
1057 * sessions to queue the unregistration of the events.
1059 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
1060 const struct lttng_event_desc
*event_desc
;
1061 struct lttng_trigger_group
*trigger_group
;
1062 struct lttng_trigger
*trigger
;
1063 struct lttng_session
*session
;
1064 struct cds_hlist_head
*head
;
1065 struct lttng_event
*event
;
1067 event_desc
= provider_desc
->event_desc
[i
];
1070 * Iterate over all session to find the current event
1073 cds_list_for_each_entry(session
, sessionsp
, node
) {
1075 * Get the list of events in the hashtable bucket and
1076 * iterate to find the event matching this descriptor.
1078 head
= borrow_hash_table_bucket(
1079 session
->events_ht
.table
,
1080 LTTNG_UST_EVENT_HT_SIZE
, event_desc
);
1082 cds_hlist_for_each_entry_safe(event
, node
, tmp_node
, head
, hlist
) {
1083 if (event_desc
== event
->desc
) {
1084 event_func(session
, event
);
1091 * Iterate over all trigger groups to find the current event
1094 cds_list_for_each_entry(trigger_group
, &trigger_groups
, node
) {
1096 * Get the list of triggers in the hashtable bucket and
1097 * iterate to find the trigger matching this
1100 head
= borrow_hash_table_bucket(
1101 trigger_group
->triggers_ht
.table
,
1102 LTTNG_UST_TRIGGER_HT_SIZE
, event_desc
);
1104 cds_hlist_for_each_entry_safe(trigger
, node
, tmp_node
, head
, hlist
) {
1105 if (event_desc
== trigger
->desc
) {
1106 trigger_func(trigger
);
1115 void _unregister_event(struct lttng_session
*session
,
1116 struct lttng_event
*event
)
1118 _lttng_event_unregister(event
);
1122 void _event_enum_destroy(struct lttng_session
*session
,
1123 struct lttng_event
*event
)
1127 /* Destroy enums of the current event. */
1128 for (i
= 0; i
< event
->desc
->nr_fields
; i
++) {
1129 const struct lttng_enum_desc
*enum_desc
;
1130 const struct lttng_event_field
*field
;
1131 struct lttng_enum
*curr_enum
;
1133 field
= &(event
->desc
->fields
[i
]);
1134 switch (field
->type
.atype
) {
1136 enum_desc
= field
->type
.u
.legacy
.basic
.enumeration
.desc
;
1138 case atype_enum_nestable
:
1139 enum_desc
= field
->type
.u
.enum_nestable
.desc
;
1145 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
1147 _lttng_enum_destroy(curr_enum
);
1151 /* Destroy event. */
1152 _lttng_event_destroy(event
);
1156 * Iterate over all the UST sessions to unregister and destroy all probes from
1157 * the probe provider descriptor received as argument. Must me called with the
1160 void lttng_probe_provider_unregister_events(
1161 struct lttng_probe_desc
*provider_desc
)
1164 * Iterate over all events in the probe provider descriptions and sessions
1165 * to queue the unregistration of the events.
1167 probe_provider_event_for_each(provider_desc
, _unregister_event
,
1168 _lttng_trigger_unregister
);
1170 /* Wait for grace period. */
1171 synchronize_trace();
1172 /* Prune the unregistration queue. */
1173 __tracepoint_probe_prune_release_queue();
1176 * It is now safe to destroy the events and remove them from the event list
1179 probe_provider_event_for_each(provider_desc
, _event_enum_destroy
,
1180 _lttng_trigger_destroy
);
1184 * Create events associated with an event enabler (if not already present),
1185 * and add backward reference from the event to the enabler.
1188 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
1190 struct lttng_session
*session
= event_enabler
->chan
->session
;
1191 struct lttng_event
*event
;
1193 if (!lttng_event_enabler_as_enabler(event_enabler
)->enabled
)
1196 /* First ensure that probe events are created for this enabler. */
1197 lttng_create_event_if_missing(event_enabler
);
1199 /* For each event matching enabler in session event list. */
1200 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1201 struct lttng_enabler_ref
*enabler_ref
;
1203 if (!lttng_event_enabler_match_event(event_enabler
, event
))
1206 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
1207 lttng_event_enabler_as_enabler(event_enabler
));
1210 * If no backward ref, create it.
1211 * Add backward ref from event to enabler.
1213 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1216 enabler_ref
->ref
= lttng_event_enabler_as_enabler(
1218 cds_list_add(&enabler_ref
->node
,
1219 &event
->enablers_ref_head
);
1223 * Link filter bytecodes if not linked yet.
1225 lttng_enabler_link_bytecode(event
->desc
,
1227 &event
->filter_bytecode_runtime_head
,
1228 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
1230 /* TODO: merge event context. */
1237 * Called at library load: connect the probe on all enablers matching
1239 * Called with session mutex held.
1241 int lttng_fix_pending_events(void)
1243 struct lttng_session
*session
;
1245 cds_list_for_each_entry(session
, &sessions
, node
) {
1246 lttng_session_lazy_sync_event_enablers(session
);
1251 int lttng_fix_pending_triggers(void)
1253 struct lttng_trigger_group
*trigger_group
;
1255 cds_list_for_each_entry(trigger_group
, &trigger_groups
, node
) {
1256 lttng_trigger_group_sync_enablers(trigger_group
);
1262 * For each session of the owner thread, execute pending statedump.
1263 * Only dump state for the sessions owned by the caller thread, because
1264 * we don't keep ust_lock across the entire iteration.
1266 void lttng_handle_pending_statedump(void *owner
)
1268 struct lttng_session
*session
;
1270 /* Execute state dump */
1271 do_lttng_ust_statedump(owner
);
1273 /* Clear pending state dump */
1277 cds_list_for_each_entry(session
, &sessions
, node
) {
1278 if (session
->owner
!= owner
)
1280 if (!session
->statedump_pending
)
1282 session
->statedump_pending
= 0;
1290 * Only used internally at session destruction.
1293 void _lttng_event_destroy(struct lttng_event
*event
)
1295 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1297 /* Remove from event list. */
1298 cds_list_del(&event
->node
);
1299 /* Remove from event hash table. */
1300 cds_hlist_del(&event
->hlist
);
1302 lttng_destroy_context(event
->ctx
);
1303 lttng_free_event_filter_runtime(event
);
1304 /* Free event enabler refs */
1305 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1306 &event
->enablers_ref_head
, node
)
1312 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1314 cds_list_del(&_enum
->node
);
1315 cds_hlist_del(&_enum
->hlist
);
1319 void lttng_ust_events_exit(void)
1321 struct lttng_session
*session
, *tmpsession
;
1323 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, node
)
1324 lttng_session_destroy(session
);
1328 * Enabler management.
1330 struct lttng_event_enabler
*lttng_event_enabler_create(
1331 enum lttng_enabler_format_type format_type
,
1332 struct lttng_ust_event
*event_param
,
1333 struct lttng_channel
*chan
)
1335 struct lttng_event_enabler
*event_enabler
;
1337 event_enabler
= zmalloc(sizeof(*event_enabler
));
1340 event_enabler
->base
.format_type
= format_type
;
1341 CDS_INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
1342 CDS_INIT_LIST_HEAD(&event_enabler
->base
.excluder_head
);
1343 memcpy(&event_enabler
->base
.event_param
, event_param
,
1344 sizeof(event_enabler
->base
.event_param
));
1345 event_enabler
->chan
= chan
;
1347 event_enabler
->base
.enabled
= 0;
1348 cds_list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
1349 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1351 return event_enabler
;
1354 struct lttng_trigger_enabler
*lttng_trigger_enabler_create(
1355 struct lttng_trigger_group
*trigger_group
,
1356 enum lttng_enabler_format_type format_type
,
1357 struct lttng_ust_trigger
*trigger_param
)
1359 struct lttng_trigger_enabler
*trigger_enabler
;
1361 trigger_enabler
= zmalloc(sizeof(*trigger_enabler
));
1362 if (!trigger_enabler
)
1364 trigger_enabler
->base
.format_type
= format_type
;
1365 CDS_INIT_LIST_HEAD(&trigger_enabler
->base
.filter_bytecode_head
);
1366 CDS_INIT_LIST_HEAD(&trigger_enabler
->capture_bytecode_head
);
1367 CDS_INIT_LIST_HEAD(&trigger_enabler
->base
.excluder_head
);
1369 trigger_enabler
->id
= trigger_param
->id
;
1370 trigger_enabler
->num_captures
= 0;
1372 memcpy(&trigger_enabler
->base
.event_param
.name
, trigger_param
->name
,
1373 sizeof(trigger_enabler
->base
.event_param
.name
));
1374 trigger_enabler
->base
.event_param
.instrumentation
= trigger_param
->instrumentation
;
1375 trigger_enabler
->base
.event_param
.loglevel
= trigger_param
->loglevel
;
1376 trigger_enabler
->base
.event_param
.loglevel_type
= trigger_param
->loglevel_type
;
1378 trigger_enabler
->base
.enabled
= 0;
1379 trigger_enabler
->group
= trigger_group
;
1381 cds_list_add(&trigger_enabler
->node
, &trigger_group
->enablers_head
);
1383 lttng_trigger_group_sync_enablers(trigger_group
);
1385 return trigger_enabler
;
1388 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
1390 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
1391 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1396 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
1398 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
1399 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1405 void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
1406 struct lttng_ust_bytecode_node
*bytecode
)
1408 bytecode
->enabler
= enabler
;
1409 cds_list_add_tail(&bytecode
->node
, &enabler
->filter_bytecode_head
);
1412 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
1413 struct lttng_ust_bytecode_node
*bytecode
)
1415 _lttng_enabler_attach_filter_bytecode(
1416 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
1418 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1423 void _lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1424 struct lttng_ust_excluder_node
*excluder
)
1426 excluder
->enabler
= enabler
;
1427 cds_list_add_tail(&excluder
->node
, &enabler
->excluder_head
);
1430 int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler
*event_enabler
,
1431 struct lttng_ust_excluder_node
*excluder
)
1433 _lttng_enabler_attach_exclusion(
1434 lttng_event_enabler_as_enabler(event_enabler
), excluder
);
1436 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1440 int lttng_trigger_enabler_enable(struct lttng_trigger_enabler
*trigger_enabler
)
1442 lttng_trigger_enabler_as_enabler(trigger_enabler
)->enabled
= 1;
1443 lttng_trigger_group_sync_enablers(trigger_enabler
->group
);
1448 int lttng_trigger_enabler_disable(struct lttng_trigger_enabler
*trigger_enabler
)
1450 lttng_trigger_enabler_as_enabler(trigger_enabler
)->enabled
= 0;
1451 lttng_trigger_group_sync_enablers(trigger_enabler
->group
);
1456 int lttng_trigger_enabler_attach_filter_bytecode(
1457 struct lttng_trigger_enabler
*trigger_enabler
,
1458 struct lttng_ust_bytecode_node
*bytecode
)
1460 _lttng_enabler_attach_filter_bytecode(
1461 lttng_trigger_enabler_as_enabler(trigger_enabler
), bytecode
);
1463 lttng_trigger_group_sync_enablers(trigger_enabler
->group
);
1467 int lttng_trigger_enabler_attach_capture_bytecode(
1468 struct lttng_trigger_enabler
*trigger_enabler
,
1469 struct lttng_ust_bytecode_node
*bytecode
)
1471 bytecode
->enabler
= lttng_trigger_enabler_as_enabler(trigger_enabler
);
1472 cds_list_add_tail(&bytecode
->node
, &trigger_enabler
->capture_bytecode_head
);
1473 trigger_enabler
->num_captures
++;
1475 lttng_trigger_group_sync_enablers(trigger_enabler
->group
);
1479 int lttng_trigger_enabler_attach_exclusion(
1480 struct lttng_trigger_enabler
*trigger_enabler
,
1481 struct lttng_ust_excluder_node
*excluder
)
1483 _lttng_enabler_attach_exclusion(
1484 lttng_trigger_enabler_as_enabler(trigger_enabler
), excluder
);
1486 lttng_trigger_group_sync_enablers(trigger_enabler
->group
);
1490 int lttng_attach_context(struct lttng_ust_context
*context_param
,
1491 union ust_args
*uargs
,
1492 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
1495 * We cannot attach a context after trace has been started for a
1496 * session because the metadata does not allow expressing this
1497 * information outside of the original channel scope.
1499 if (session
->been_active
)
1502 switch (context_param
->ctx
) {
1503 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
1504 return lttng_add_pthread_id_to_ctx(ctx
);
1505 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
1507 struct lttng_ust_perf_counter_ctx
*perf_ctx_param
;
1509 perf_ctx_param
= &context_param
->u
.perf_counter
;
1510 return lttng_add_perf_counter_to_ctx(
1511 perf_ctx_param
->type
,
1512 perf_ctx_param
->config
,
1513 perf_ctx_param
->name
,
1516 case LTTNG_UST_CONTEXT_VTID
:
1517 return lttng_add_vtid_to_ctx(ctx
);
1518 case LTTNG_UST_CONTEXT_VPID
:
1519 return lttng_add_vpid_to_ctx(ctx
);
1520 case LTTNG_UST_CONTEXT_PROCNAME
:
1521 return lttng_add_procname_to_ctx(ctx
);
1522 case LTTNG_UST_CONTEXT_IP
:
1523 return lttng_add_ip_to_ctx(ctx
);
1524 case LTTNG_UST_CONTEXT_CPU_ID
:
1525 return lttng_add_cpu_id_to_ctx(ctx
);
1526 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
1527 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1529 case LTTNG_UST_CONTEXT_CGROUP_NS
:
1530 return lttng_add_cgroup_ns_to_ctx(ctx
);
1531 case LTTNG_UST_CONTEXT_IPC_NS
:
1532 return lttng_add_ipc_ns_to_ctx(ctx
);
1533 case LTTNG_UST_CONTEXT_MNT_NS
:
1534 return lttng_add_mnt_ns_to_ctx(ctx
);
1535 case LTTNG_UST_CONTEXT_NET_NS
:
1536 return lttng_add_net_ns_to_ctx(ctx
);
1537 case LTTNG_UST_CONTEXT_PID_NS
:
1538 return lttng_add_pid_ns_to_ctx(ctx
);
1539 case LTTNG_UST_CONTEXT_USER_NS
:
1540 return lttng_add_user_ns_to_ctx(ctx
);
1541 case LTTNG_UST_CONTEXT_UTS_NS
:
1542 return lttng_add_uts_ns_to_ctx(ctx
);
1543 case LTTNG_UST_CONTEXT_VUID
:
1544 return lttng_add_vuid_to_ctx(ctx
);
1545 case LTTNG_UST_CONTEXT_VEUID
:
1546 return lttng_add_veuid_to_ctx(ctx
);
1547 case LTTNG_UST_CONTEXT_VSUID
:
1548 return lttng_add_vsuid_to_ctx(ctx
);
1549 case LTTNG_UST_CONTEXT_VGID
:
1550 return lttng_add_vgid_to_ctx(ctx
);
1551 case LTTNG_UST_CONTEXT_VEGID
:
1552 return lttng_add_vegid_to_ctx(ctx
);
1553 case LTTNG_UST_CONTEXT_VSGID
:
1554 return lttng_add_vsgid_to_ctx(ctx
);
1560 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*enabler
,
1561 struct lttng_ust_context
*context_param
)
1566 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
1568 if (!event_enabler
) {
1571 cds_list_del(&event_enabler
->node
);
1573 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
1575 lttng_destroy_context(event_enabler
->ctx
);
1576 free(event_enabler
);
1580 * lttng_session_sync_event_enablers should be called just before starting a
1584 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
1586 struct lttng_event_enabler
*event_enabler
;
1587 struct lttng_event
*event
;
1589 cds_list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
1590 lttng_event_enabler_ref_events(event_enabler
);
1592 * For each event, if at least one of its enablers is enabled,
1593 * and its channel and session transient states are enabled, we
1594 * enable the event, else we disable it.
1596 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1597 struct lttng_enabler_ref
*enabler_ref
;
1598 struct lttng_bytecode_runtime
*runtime
;
1599 int enabled
= 0, has_enablers_without_bytecode
= 0;
1602 cds_list_for_each_entry(enabler_ref
,
1603 &event
->enablers_ref_head
, node
) {
1604 if (enabler_ref
->ref
->enabled
) {
1610 * Enabled state is based on union of enablers, with
1611 * intesection of session and channel transient enable
1614 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1616 CMM_STORE_SHARED(event
->enabled
, enabled
);
1618 * Sync tracepoint registration with event enabled
1622 if (!event
->registered
)
1623 register_event(event
);
1625 if (event
->registered
)
1626 unregister_event(event
);
1629 /* Check if has enablers without bytecode enabled */
1630 cds_list_for_each_entry(enabler_ref
,
1631 &event
->enablers_ref_head
, node
) {
1632 if (enabler_ref
->ref
->enabled
1633 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1634 has_enablers_without_bytecode
= 1;
1638 event
->has_enablers_without_bytecode
=
1639 has_enablers_without_bytecode
;
1641 /* Enable filters */
1642 cds_list_for_each_entry(runtime
,
1643 &event
->filter_bytecode_runtime_head
, node
) {
1644 lttng_bytecode_filter_sync_state(runtime
);
1647 __tracepoint_probe_prune_release_queue();
1651 void lttng_create_trigger_if_missing(struct lttng_trigger_enabler
*trigger_enabler
)
1653 struct lttng_trigger_group
*trigger_group
= trigger_enabler
->group
;
1654 struct lttng_probe_desc
*probe_desc
;
1655 struct cds_list_head
*probe_list
;
1658 probe_list
= lttng_get_probe_list_head();
1660 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1661 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1664 const struct lttng_event_desc
*desc
;
1665 struct lttng_trigger
*trigger
;
1666 struct cds_hlist_head
*head
;
1667 struct cds_hlist_node
*node
;
1669 desc
= probe_desc
->event_desc
[i
];
1671 if (!lttng_desc_match_enabler(desc
,
1672 lttng_trigger_enabler_as_enabler(trigger_enabler
)))
1676 * Given the current trigger group, get the bucket that
1677 * the target trigger would be if it was already
1680 head
= borrow_hash_table_bucket(
1681 trigger_group
->triggers_ht
.table
,
1682 LTTNG_UST_TRIGGER_HT_SIZE
, desc
);
1684 cds_hlist_for_each_entry(trigger
, node
, head
, hlist
) {
1686 * Check if trigger already exists by checking
1687 * if the trigger and enabler share the same
1688 * description and id.
1690 if (trigger
->desc
== desc
&&
1691 trigger
->id
== trigger_enabler
->id
) {
1701 * We need to create a trigger for this event probe.
1703 ret
= lttng_trigger_create(desc
, trigger_enabler
->id
,
1706 DBG("Unable to create trigger %s, error %d\n",
1707 probe_desc
->event_desc
[i
]->name
, ret
);
1714 * Create triggers associated with a trigger enabler (if not already present).
1717 int lttng_trigger_enabler_ref_triggers(struct lttng_trigger_enabler
*trigger_enabler
)
1719 struct lttng_trigger_group
*trigger_group
= trigger_enabler
->group
;
1720 struct lttng_trigger
*trigger
;
1723 * Only try to create triggers for enablers that are enabled, the user
1724 * might still be attaching filter or exclusion to the
1727 if (!lttng_trigger_enabler_as_enabler(trigger_enabler
)->enabled
)
1730 /* First, ensure that probe triggers are created for this enabler. */
1731 lttng_create_trigger_if_missing(trigger_enabler
);
1733 /* Link the created trigger with its associated enabler. */
1734 cds_list_for_each_entry(trigger
, &trigger_group
->triggers_head
, node
) {
1735 struct lttng_enabler_ref
*enabler_ref
;
1737 if (!lttng_trigger_enabler_match_trigger(trigger_enabler
, trigger
))
1740 enabler_ref
= lttng_enabler_ref(&trigger
->enablers_ref_head
,
1741 lttng_trigger_enabler_as_enabler(trigger_enabler
));
1744 * If no backward ref, create it.
1745 * Add backward ref from trigger to enabler.
1747 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1751 enabler_ref
->ref
= lttng_trigger_enabler_as_enabler(
1753 cds_list_add(&enabler_ref
->node
,
1754 &trigger
->enablers_ref_head
);
1758 * Link filter bytecodes if not linked yet.
1760 lttng_enabler_link_bytecode(trigger
->desc
,
1761 &trigger_group
->ctx
, &trigger
->filter_bytecode_runtime_head
,
1762 <tng_trigger_enabler_as_enabler(trigger_enabler
)->filter_bytecode_head
);
1765 * Link capture bytecodes if not linked yet.
1767 lttng_enabler_link_bytecode(trigger
->desc
,
1768 &trigger_group
->ctx
, &trigger
->capture_bytecode_runtime_head
,
1769 &trigger_enabler
->capture_bytecode_head
);
1770 trigger
->num_captures
= trigger_enabler
->num_captures
;
1777 void lttng_trigger_group_sync_enablers(struct lttng_trigger_group
*trigger_group
)
1779 struct lttng_trigger_enabler
*trigger_enabler
;
1780 struct lttng_trigger
*trigger
;
1782 cds_list_for_each_entry(trigger_enabler
, &trigger_group
->enablers_head
, node
)
1783 lttng_trigger_enabler_ref_triggers(trigger_enabler
);
1786 * For each trigger, if at least one of its enablers is enabled,
1787 * we enable the trigger, else we disable it.
1789 cds_list_for_each_entry(trigger
, &trigger_group
->triggers_head
, node
) {
1790 struct lttng_enabler_ref
*enabler_ref
;
1791 struct lttng_bytecode_runtime
*runtime
;
1792 int enabled
= 0, has_enablers_without_bytecode
= 0;
1794 /* Enable triggers */
1795 cds_list_for_each_entry(enabler_ref
,
1796 &trigger
->enablers_ref_head
, node
) {
1797 if (enabler_ref
->ref
->enabled
) {
1803 CMM_STORE_SHARED(trigger
->enabled
, enabled
);
1805 * Sync tracepoint registration with trigger enabled
1809 if (!trigger
->registered
)
1810 register_trigger(trigger
);
1812 if (trigger
->registered
)
1813 unregister_trigger(trigger
);
1816 /* Check if has enablers without bytecode enabled */
1817 cds_list_for_each_entry(enabler_ref
,
1818 &trigger
->enablers_ref_head
, node
) {
1819 if (enabler_ref
->ref
->enabled
1820 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1821 has_enablers_without_bytecode
= 1;
1825 trigger
->has_enablers_without_bytecode
=
1826 has_enablers_without_bytecode
;
1828 /* Enable filters */
1829 cds_list_for_each_entry(runtime
,
1830 &trigger
->filter_bytecode_runtime_head
, node
) {
1831 lttng_bytecode_filter_sync_state(runtime
);
1834 /* Enable captures. */
1835 cds_list_for_each_entry(runtime
,
1836 &trigger
->capture_bytecode_runtime_head
, node
) {
1837 lttng_bytecode_capture_sync_state(runtime
);
1840 __tracepoint_probe_prune_release_queue();
1844 * Apply enablers to session events, adding events to session if need
1845 * be. It is required after each modification applied to an active
1846 * session, and right before session "start".
1847 * "lazy" sync means we only sync if required.
1850 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
1852 /* We can skip if session is not active */
1853 if (!session
->active
)
1855 lttng_session_sync_event_enablers(session
);
1859 * Update all sessions with the given app context.
1860 * Called with ust lock held.
1861 * This is invoked when an application context gets loaded/unloaded. It
1862 * ensures the context callbacks are in sync with the application
1863 * context (either app context callbacks, or dummy callbacks).
1865 void lttng_ust_context_set_session_provider(const char *name
,
1866 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1867 void (*record
)(struct lttng_ctx_field
*field
,
1868 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1869 struct lttng_channel
*chan
),
1870 void (*get_value
)(struct lttng_ctx_field
*field
,
1871 struct lttng_ctx_value
*value
))
1873 struct lttng_session
*session
;
1875 cds_list_for_each_entry(session
, &sessions
, node
) {
1876 struct lttng_channel
*chan
;
1877 struct lttng_event
*event
;
1880 ret
= lttng_ust_context_set_provider_rcu(&session
->ctx
,
1881 name
, get_size
, record
, get_value
);
1884 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
1885 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
1886 name
, get_size
, record
, get_value
);
1890 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1891 ret
= lttng_ust_context_set_provider_rcu(&event
->ctx
,
1892 name
, get_size
, record
, get_value
);
1900 * Update all trigger groups with the given app context.
1901 * Called with ust lock held.
1902 * This is invoked when an application context gets loaded/unloaded. It
1903 * ensures the context callbacks are in sync with the application
1904 * context (either app context callbacks, or dummy callbacks).
1906 void lttng_ust_context_set_trigger_group_provider(const char *name
,
1907 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1908 void (*record
)(struct lttng_ctx_field
*field
,
1909 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1910 struct lttng_channel
*chan
),
1911 void (*get_value
)(struct lttng_ctx_field
*field
,
1912 struct lttng_ctx_value
*value
))
1914 struct lttng_trigger_group
*trigger_group
;
1916 cds_list_for_each_entry(trigger_group
, &trigger_groups
, node
) {
1919 ret
= lttng_ust_context_set_provider_rcu(&trigger_group
->ctx
,
1920 name
, get_size
, record
, get_value
);