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
37 #include <lttng/ust-endian.h>
40 #include <urcu/arch.h>
41 #include <urcu/compiler.h>
42 #include <urcu/hlist.h>
43 #include <urcu/list.h>
44 #include <urcu/uatomic.h>
46 #include <lttng/tracepoint.h>
47 #include <lttng/ust-events.h>
49 #include <usterr-signal-safe.h>
51 #include <lttng/ust-ctl.h>
54 #include <lttng/ust-dynamic-type.h>
55 #include <lttng/ust-context-provider.h>
58 #include "lttng-ust-uuid.h"
60 #include "tracepoint-internal.h"
61 #include "string-utils.h"
62 #include "lttng-bytecode.h"
63 #include "lttng-tracer.h"
64 #include "lttng-tracer-core.h"
65 #include "lttng-ust-statedump.h"
66 #include "context-internal.h"
67 #include "ust-events-internal.h"
69 #include "../libringbuffer/shm.h"
70 #include "../libcounter/counter.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(event_notifier_groups
);
82 struct cds_list_head
*_lttng_get_sessions(void)
87 static void _lttng_event_destroy(struct lttng_event
*event
);
88 static void _lttng_event_notifier_destroy(
89 struct lttng_event_notifier
*event_notifier
);
90 static void _lttng_enum_destroy(struct lttng_enum
*_enum
);
93 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
);
95 void lttng_session_sync_event_enablers(struct lttng_session
*session
);
97 void lttng_event_notifier_group_sync_enablers(
98 struct lttng_event_notifier_group
*event_notifier_group
);
100 void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
103 * Called with ust lock held.
105 int lttng_session_active(void)
107 struct lttng_session
*iter
;
109 cds_list_for_each_entry(iter
, &sessions
, node
) {
117 int lttng_loglevel_match(int loglevel
,
118 unsigned int has_loglevel
,
119 enum lttng_ust_loglevel_type req_type
,
123 loglevel
= TRACE_DEFAULT
;
125 case LTTNG_UST_LOGLEVEL_RANGE
:
126 if (loglevel
<= req_loglevel
127 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
131 case LTTNG_UST_LOGLEVEL_SINGLE
:
132 if (loglevel
== req_loglevel
133 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
137 case LTTNG_UST_LOGLEVEL_ALL
:
139 if (loglevel
<= TRACE_DEBUG
)
146 void synchronize_trace(void)
151 struct lttng_session
*lttng_session_create(void)
153 struct lttng_session
*session
;
156 session
= zmalloc(sizeof(struct lttng_session
));
159 if (lttng_context_init_all(&session
->ctx
)) {
163 CDS_INIT_LIST_HEAD(&session
->chan_head
);
164 CDS_INIT_LIST_HEAD(&session
->events_head
);
165 CDS_INIT_LIST_HEAD(&session
->enums_head
);
166 CDS_INIT_LIST_HEAD(&session
->enablers_head
);
167 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
168 CDS_INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
169 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
170 CDS_INIT_HLIST_HEAD(&session
->enums_ht
.table
[i
]);
171 cds_list_add(&session
->node
, &sessions
);
175 struct lttng_counter
*lttng_ust_counter_create(
176 const char *counter_transport_name
,
177 size_t number_dimensions
, const struct lttng_counter_dimension
*dimensions
)
179 struct lttng_counter_transport
*counter_transport
= NULL
;
180 struct lttng_counter
*counter
= NULL
;
182 counter_transport
= lttng_counter_transport_find(counter_transport_name
);
183 if (!counter_transport
)
185 counter
= zmalloc(sizeof(struct lttng_counter
));
189 counter
->ops
= &counter_transport
->ops
;
190 counter
->transport
= counter_transport
;
192 counter
->counter
= counter
->ops
->counter_create(
193 number_dimensions
, dimensions
, 0,
195 if (!counter
->counter
) {
209 void lttng_ust_counter_destroy(struct lttng_counter
*counter
)
211 counter
->ops
->counter_destroy(counter
->counter
);
215 struct lttng_event_notifier_group
*lttng_event_notifier_group_create(void)
217 struct lttng_event_notifier_group
*event_notifier_group
;
220 event_notifier_group
= zmalloc(sizeof(struct lttng_event_notifier_group
));
221 if (!event_notifier_group
)
224 /* Add all contexts. */
225 if (lttng_context_init_all(&event_notifier_group
->ctx
)) {
226 free(event_notifier_group
);
230 CDS_INIT_LIST_HEAD(&event_notifier_group
->enablers_head
);
231 CDS_INIT_LIST_HEAD(&event_notifier_group
->event_notifiers_head
);
232 for (i
= 0; i
< LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
; i
++)
233 CDS_INIT_HLIST_HEAD(&event_notifier_group
->event_notifiers_ht
.table
[i
]);
235 cds_list_add(&event_notifier_group
->node
, &event_notifier_groups
);
237 return event_notifier_group
;
241 * Only used internally at session destruction.
244 void _lttng_channel_unmap(struct lttng_channel
*lttng_chan
)
246 struct channel
*chan
;
247 struct lttng_ust_shm_handle
*handle
;
249 cds_list_del(<tng_chan
->node
);
250 lttng_destroy_context(lttng_chan
->ctx
);
251 chan
= lttng_chan
->chan
;
252 handle
= lttng_chan
->handle
;
254 * note: lttng_chan is private data contained within handle. It
255 * will be freed along with the handle.
257 channel_destroy(chan
, handle
, 0);
261 void register_event(struct lttng_event
*event
)
264 const struct lttng_event_desc
*desc
;
266 assert(event
->registered
== 0);
268 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
269 desc
->probe_callback
,
270 event
, desc
->signature
);
273 event
->registered
= 1;
277 void register_event_notifier(struct lttng_event_notifier
*event_notifier
)
280 const struct lttng_event_desc
*desc
;
282 assert(event_notifier
->registered
== 0);
283 desc
= event_notifier
->desc
;
284 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
285 desc
->u
.ext
.event_notifier_callback
, event_notifier
, desc
->signature
);
288 event_notifier
->registered
= 1;
292 void unregister_event(struct lttng_event
*event
)
295 const struct lttng_event_desc
*desc
;
297 assert(event
->registered
== 1);
299 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
300 desc
->probe_callback
,
304 event
->registered
= 0;
308 void unregister_event_notifier(struct lttng_event_notifier
*event_notifier
)
311 const struct lttng_event_desc
*desc
;
313 assert(event_notifier
->registered
== 1);
314 desc
= event_notifier
->desc
;
315 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
316 desc
->u
.ext
.event_notifier_callback
, event_notifier
);
319 event_notifier
->registered
= 0;
323 * Only used internally at session destruction.
326 void _lttng_event_unregister(struct lttng_event
*event
)
328 if (event
->registered
)
329 unregister_event(event
);
333 * Only used internally at session destruction.
336 void _lttng_event_notifier_unregister(struct lttng_event_notifier
*event_notifier
)
338 if (event_notifier
->registered
)
339 unregister_event_notifier(event_notifier
);
342 void lttng_session_destroy(struct lttng_session
*session
)
344 struct lttng_channel
*chan
, *tmpchan
;
345 struct lttng_event
*event
, *tmpevent
;
346 struct lttng_enum
*_enum
, *tmp_enum
;
347 struct lttng_event_enabler
*event_enabler
, *event_tmpenabler
;
349 CMM_ACCESS_ONCE(session
->active
) = 0;
350 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
351 _lttng_event_unregister(event
);
353 synchronize_trace(); /* Wait for in-flight events to complete */
354 __tracepoint_probe_prune_release_queue();
355 cds_list_for_each_entry_safe(event_enabler
, event_tmpenabler
,
356 &session
->enablers_head
, node
)
357 lttng_event_enabler_destroy(event_enabler
);
358 cds_list_for_each_entry_safe(event
, tmpevent
,
359 &session
->events_head
, node
)
360 _lttng_event_destroy(event
);
361 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
362 &session
->enums_head
, node
)
363 _lttng_enum_destroy(_enum
);
364 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->chan_head
, node
)
365 _lttng_channel_unmap(chan
);
366 cds_list_del(&session
->node
);
367 lttng_destroy_context(session
->ctx
);
371 void lttng_event_notifier_group_destroy(
372 struct lttng_event_notifier_group
*event_notifier_group
)
375 struct lttng_event_notifier_enabler
*notifier_enabler
, *tmpnotifier_enabler
;
376 struct lttng_event_notifier
*notifier
, *tmpnotifier
;
378 if (!event_notifier_group
) {
382 cds_list_for_each_entry(notifier
,
383 &event_notifier_group
->event_notifiers_head
, node
)
384 _lttng_event_notifier_unregister(notifier
);
388 cds_list_for_each_entry_safe(notifier_enabler
, tmpnotifier_enabler
,
389 &event_notifier_group
->enablers_head
, node
)
390 lttng_event_notifier_enabler_destroy(notifier_enabler
);
392 cds_list_for_each_entry_safe(notifier
, tmpnotifier
,
393 &event_notifier_group
->event_notifiers_head
, node
)
394 _lttng_event_notifier_destroy(notifier
);
396 if (event_notifier_group
->error_counter
)
397 lttng_ust_counter_destroy(event_notifier_group
->error_counter
);
399 /* Close the notification fd to the listener of event_notifiers. */
401 lttng_ust_lock_fd_tracker();
402 close_ret
= close(event_notifier_group
->notification_fd
);
404 lttng_ust_delete_fd_from_tracker(
405 event_notifier_group
->notification_fd
);
410 lttng_ust_unlock_fd_tracker();
412 cds_list_del(&event_notifier_group
->node
);
414 free(event_notifier_group
);
418 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
420 struct lttng_ust_bytecode_node
*filter_node
, *tmp_filter_node
;
421 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
427 /* Destroy filter bytecode */
428 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
429 &enabler
->filter_bytecode_head
, node
) {
433 /* Destroy excluders */
434 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
435 &enabler
->excluder_head
, node
) {
440 void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler
*event_notifier_enabler
)
442 if (!event_notifier_enabler
) {
446 cds_list_del(&event_notifier_enabler
->node
);
448 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
450 free(event_notifier_enabler
);
454 int lttng_enum_create(const struct lttng_enum_desc
*desc
,
455 struct lttng_session
*session
)
457 const char *enum_name
= desc
->name
;
458 struct lttng_enum
*_enum
;
459 struct cds_hlist_head
*head
;
461 size_t name_len
= strlen(enum_name
);
465 /* Check if this enum is already registered for this session. */
466 hash
= jhash(enum_name
, name_len
, 0);
467 head
= &session
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
469 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
475 notify_socket
= lttng_get_notify_socket(session
->owner
);
476 if (notify_socket
< 0) {
481 _enum
= zmalloc(sizeof(*_enum
));
486 _enum
->session
= session
;
489 ret
= ustcomm_register_enum(notify_socket
,
496 DBG("Error (%d) registering enumeration to sessiond", ret
);
497 goto sessiond_register_error
;
499 cds_list_add(&_enum
->node
, &session
->enums_head
);
500 cds_hlist_add_head(&_enum
->hlist
, head
);
503 sessiond_register_error
:
512 int lttng_create_enum_check(const struct lttng_type
*type
,
513 struct lttng_session
*session
)
515 switch (type
->atype
) {
518 const struct lttng_enum_desc
*enum_desc
;
521 enum_desc
= type
->u
.legacy
.basic
.enumeration
.desc
;
522 ret
= lttng_enum_create(enum_desc
, session
);
523 if (ret
&& ret
!= -EEXIST
) {
524 DBG("Unable to create enum error: (%d)", ret
);
529 case atype_enum_nestable
:
531 const struct lttng_enum_desc
*enum_desc
;
534 enum_desc
= type
->u
.enum_nestable
.desc
;
535 ret
= lttng_enum_create(enum_desc
, session
);
536 if (ret
&& ret
!= -EEXIST
) {
537 DBG("Unable to create enum error: (%d)", ret
);
544 const struct lttng_event_field
*tag_field_generic
;
545 const struct lttng_enum_desc
*enum_desc
;
548 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
549 enum_desc
= tag_field_generic
->type
.u
.enum_nestable
.desc
;
550 ret
= lttng_enum_create(enum_desc
, session
);
551 if (ret
&& ret
!= -EEXIST
) {
552 DBG("Unable to create enum error: (%d)", ret
);
558 /* TODO: nested types when they become supported. */
565 int lttng_create_all_event_enums(size_t nr_fields
,
566 const struct lttng_event_field
*event_fields
,
567 struct lttng_session
*session
)
572 /* For each field, ensure enum is part of the session. */
573 for (i
= 0; i
< nr_fields
; i
++) {
574 const struct lttng_type
*type
= &event_fields
[i
].type
;
576 ret
= lttng_create_enum_check(type
, session
);
584 int lttng_create_all_ctx_enums(size_t nr_fields
,
585 const struct lttng_ctx_field
*ctx_fields
,
586 struct lttng_session
*session
)
591 /* For each field, ensure enum is part of the session. */
592 for (i
= 0; i
< nr_fields
; i
++) {
593 const struct lttng_type
*type
= &ctx_fields
[i
].event_field
.type
;
595 ret
= lttng_create_enum_check(type
, session
);
603 * Ensure that a state-dump will be performed for this session at the end
604 * of the current handle_message().
606 int lttng_session_statedump(struct lttng_session
*session
)
608 session
->statedump_pending
= 1;
609 lttng_ust_sockinfo_session_enabled(session
->owner
);
613 int lttng_session_enable(struct lttng_session
*session
)
616 struct lttng_channel
*chan
;
619 if (session
->active
) {
624 notify_socket
= lttng_get_notify_socket(session
->owner
);
625 if (notify_socket
< 0)
626 return notify_socket
;
628 /* Set transient enabler state to "enabled" */
631 /* We need to sync enablers with session before activation. */
632 lttng_session_sync_event_enablers(session
);
635 * Snapshot the number of events per channel to know the type of header
638 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
639 const struct lttng_ctx
*ctx
;
640 const struct lttng_ctx_field
*fields
= NULL
;
641 size_t nr_fields
= 0;
644 /* don't change it if session stop/restart */
645 if (chan
->header_type
)
649 nr_fields
= ctx
->nr_fields
;
650 fields
= ctx
->fields
;
651 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
654 DBG("Error (%d) adding enum to session", ret
);
658 ret
= ustcomm_register_channel(notify_socket
,
667 DBG("Error (%d) registering channel to sessiond", ret
);
670 if (chan_id
!= chan
->id
) {
671 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
677 /* Set atomically the state to "active" */
678 CMM_ACCESS_ONCE(session
->active
) = 1;
679 CMM_ACCESS_ONCE(session
->been_active
) = 1;
681 ret
= lttng_session_statedump(session
);
688 int lttng_session_disable(struct lttng_session
*session
)
692 if (!session
->active
) {
696 /* Set atomically the state to "inactive" */
697 CMM_ACCESS_ONCE(session
->active
) = 0;
699 /* Set transient enabler state to "disabled" */
701 lttng_session_sync_event_enablers(session
);
706 int lttng_channel_enable(struct lttng_channel
*channel
)
710 if (channel
->enabled
) {
714 /* Set transient enabler state to "enabled" */
716 lttng_session_sync_event_enablers(channel
->session
);
717 /* Set atomically the state to "enabled" */
718 CMM_ACCESS_ONCE(channel
->enabled
) = 1;
723 int lttng_channel_disable(struct lttng_channel
*channel
)
727 if (!channel
->enabled
) {
731 /* Set atomically the state to "disabled" */
732 CMM_ACCESS_ONCE(channel
->enabled
) = 0;
733 /* Set transient enabler state to "enabled" */
735 lttng_session_sync_event_enablers(channel
->session
);
741 struct cds_hlist_head
*borrow_hash_table_bucket(
742 struct cds_hlist_head
*hash_table
,
743 unsigned int hash_table_size
,
744 const struct lttng_event_desc
*desc
)
746 const char *event_name
;
750 event_name
= desc
->name
;
751 name_len
= strlen(event_name
);
753 hash
= jhash(event_name
, name_len
, 0);
754 return &hash_table
[hash
& (hash_table_size
- 1)];
758 * Supports event creation while tracing session is active.
761 int lttng_event_create(const struct lttng_event_desc
*desc
,
762 struct lttng_channel
*chan
)
764 struct lttng_event
*event
;
765 struct lttng_session
*session
= chan
->session
;
766 struct cds_hlist_head
*head
;
768 int notify_socket
, loglevel
;
771 head
= borrow_hash_table_bucket(chan
->session
->events_ht
.table
,
772 LTTNG_UST_EVENT_HT_SIZE
, desc
);
774 notify_socket
= lttng_get_notify_socket(session
->owner
);
775 if (notify_socket
< 0) {
780 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
783 DBG("Error (%d) adding enum to session", ret
);
784 goto create_enum_error
;
788 * Check if loglevel match. Refuse to connect event if not.
790 event
= zmalloc(sizeof(struct lttng_event
));
797 /* Event will be enabled by enabler sync. */
799 event
->registered
= 0;
800 CDS_INIT_LIST_HEAD(&event
->filter_bytecode_runtime_head
);
801 CDS_INIT_LIST_HEAD(&event
->enablers_ref_head
);
805 loglevel
= *(*event
->desc
->loglevel
);
807 loglevel
= TRACE_DEFAULT
;
808 if (desc
->u
.ext
.model_emf_uri
)
809 uri
= *(desc
->u
.ext
.model_emf_uri
);
813 /* Fetch event ID from sessiond */
814 ret
= ustcomm_register_event(notify_socket
,
826 DBG("Error (%d) registering event to sessiond", ret
);
827 goto sessiond_register_error
;
830 cds_list_add(&event
->node
, &chan
->session
->events_head
);
831 cds_hlist_add_head(&event
->hlist
, head
);
834 sessiond_register_error
:
843 int lttng_event_notifier_create(const struct lttng_event_desc
*desc
,
845 struct lttng_event_notifier_group
*event_notifier_group
)
847 struct lttng_event_notifier
*event_notifier
;
848 struct cds_hlist_head
*head
;
852 * Get the hashtable bucket the created lttng_event_notifier object
853 * should be inserted.
855 head
= borrow_hash_table_bucket(
856 event_notifier_group
->event_notifiers_ht
.table
,
857 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
859 event_notifier
= zmalloc(sizeof(struct lttng_event_notifier
));
860 if (!event_notifier
) {
865 event_notifier
->group
= event_notifier_group
;
866 event_notifier
->user_token
= token
;
868 /* Event notifier will be enabled by enabler sync. */
869 event_notifier
->enabled
= 0;
870 event_notifier
->registered
= 0;
872 CDS_INIT_LIST_HEAD(&event_notifier
->filter_bytecode_runtime_head
);
873 CDS_INIT_LIST_HEAD(&event_notifier
->capture_bytecode_runtime_head
);
874 CDS_INIT_LIST_HEAD(&event_notifier
->enablers_ref_head
);
875 event_notifier
->desc
= desc
;
877 cds_list_add(&event_notifier
->node
,
878 &event_notifier_group
->event_notifiers_head
);
879 cds_hlist_add_head(&event_notifier
->hlist
, head
);
888 void _lttng_event_notifier_destroy(struct lttng_event_notifier
*event_notifier
)
890 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
892 /* Remove from event_notifier list. */
893 cds_list_del(&event_notifier
->node
);
894 /* Remove from event_notifier hash table. */
895 cds_hlist_del(&event_notifier
->hlist
);
897 lttng_free_event_notifier_filter_runtime(event_notifier
);
899 /* Free event_notifier enabler refs */
900 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
901 &event_notifier
->enablers_ref_head
, node
)
903 free(event_notifier
);
907 int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc
*desc
,
908 struct lttng_enabler
*enabler
)
911 unsigned int has_loglevel
= 0;
913 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_STAR_GLOB
);
914 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
915 desc
->name
, SIZE_MAX
))
917 if (desc
->loglevel
) {
918 loglevel
= *(*desc
->loglevel
);
921 if (!lttng_loglevel_match(loglevel
,
923 enabler
->event_param
.loglevel_type
,
924 enabler
->event_param
.loglevel
))
930 int lttng_desc_match_event_enabler(const struct lttng_event_desc
*desc
,
931 struct lttng_enabler
*enabler
)
934 unsigned int has_loglevel
= 0;
936 assert(enabler
->format_type
== LTTNG_ENABLER_FORMAT_EVENT
);
937 if (strcmp(desc
->name
, enabler
->event_param
.name
))
939 if (desc
->loglevel
) {
940 loglevel
= *(*desc
->loglevel
);
943 if (!lttng_loglevel_match(loglevel
,
945 enabler
->event_param
.loglevel_type
,
946 enabler
->event_param
.loglevel
))
952 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
953 struct lttng_enabler
*enabler
)
955 switch (enabler
->format_type
) {
956 case LTTNG_ENABLER_FORMAT_STAR_GLOB
:
958 struct lttng_ust_excluder_node
*excluder
;
960 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
965 * If the matching event matches with an excluder,
966 * return 'does not match'
968 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
971 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
975 excluder_name
= (char *) (excluder
->excluder
.names
)
976 + count
* LTTNG_UST_SYM_NAME_LEN
;
977 len
= strnlen(excluder_name
, LTTNG_UST_SYM_NAME_LEN
);
978 if (len
> 0 && strutils_star_glob_match(excluder_name
, len
, desc
->name
, SIZE_MAX
))
984 case LTTNG_ENABLER_FORMAT_EVENT
:
985 return lttng_desc_match_event_enabler(desc
, enabler
);
992 int lttng_event_enabler_match_event(struct lttng_event_enabler
*event_enabler
,
993 struct lttng_event
*event
)
995 if (lttng_desc_match_enabler(event
->desc
,
996 lttng_event_enabler_as_enabler(event_enabler
))
997 && event
->chan
== event_enabler
->chan
)
1004 int lttng_event_notifier_enabler_match_event_notifier(
1005 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1006 struct lttng_event_notifier
*event_notifier
)
1008 int desc_matches
= lttng_desc_match_enabler(event_notifier
->desc
,
1009 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1011 if (desc_matches
&& event_notifier
->group
== event_notifier_enabler
->group
&&
1012 event_notifier
->user_token
== event_notifier_enabler
->user_token
)
1019 struct lttng_enabler_ref
*lttng_enabler_ref(
1020 struct cds_list_head
*enabler_ref_list
,
1021 struct lttng_enabler
*enabler
)
1023 struct lttng_enabler_ref
*enabler_ref
;
1025 cds_list_for_each_entry(enabler_ref
, enabler_ref_list
, node
) {
1026 if (enabler_ref
->ref
== enabler
)
1033 * Create struct lttng_event if it is missing and present in the list of
1034 * tracepoint probes.
1037 void lttng_create_event_if_missing(struct lttng_event_enabler
*event_enabler
)
1039 struct lttng_session
*session
= event_enabler
->chan
->session
;
1040 struct lttng_probe_desc
*probe_desc
;
1041 const struct lttng_event_desc
*desc
;
1042 struct lttng_event
*event
;
1044 struct cds_list_head
*probe_list
;
1046 probe_list
= lttng_get_probe_list_head();
1048 * For each probe event, if we find that a probe event matches
1049 * our enabler, create an associated lttng_event if not
1052 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1053 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1056 struct cds_hlist_head
*head
;
1057 struct cds_hlist_node
*node
;
1059 desc
= probe_desc
->event_desc
[i
];
1060 if (!lttng_desc_match_enabler(desc
,
1061 lttng_event_enabler_as_enabler(event_enabler
)))
1064 head
= borrow_hash_table_bucket(
1065 session
->events_ht
.table
,
1066 LTTNG_UST_EVENT_HT_SIZE
, desc
);
1068 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
1069 if (event
->desc
== desc
1070 && event
->chan
== event_enabler
->chan
) {
1079 * We need to create an event for this
1082 ret
= lttng_event_create(probe_desc
->event_desc
[i
],
1083 event_enabler
->chan
);
1085 DBG("Unable to create event %s, error %d\n",
1086 probe_desc
->event_desc
[i
]->name
, ret
);
1093 void probe_provider_event_for_each(struct lttng_probe_desc
*provider_desc
,
1094 void (*event_func
)(struct lttng_session
*session
,
1095 struct lttng_event
*event
),
1096 void (*event_notifier_func
)(struct lttng_event_notifier
*event_notifier
))
1098 struct cds_hlist_node
*node
, *tmp_node
;
1099 struct cds_list_head
*sessionsp
;
1102 /* Get handle on list of sessions. */
1103 sessionsp
= _lttng_get_sessions();
1106 * Iterate over all events in the probe provider descriptions and
1107 * sessions to queue the unregistration of the events.
1109 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
1110 const struct lttng_event_desc
*event_desc
;
1111 struct lttng_event_notifier_group
*event_notifier_group
;
1112 struct lttng_event_notifier
*event_notifier
;
1113 struct lttng_session
*session
;
1114 struct cds_hlist_head
*head
;
1115 struct lttng_event
*event
;
1117 event_desc
= provider_desc
->event_desc
[i
];
1120 * Iterate over all session to find the current event
1123 cds_list_for_each_entry(session
, sessionsp
, node
) {
1125 * Get the list of events in the hashtable bucket and
1126 * iterate to find the event matching this descriptor.
1128 head
= borrow_hash_table_bucket(
1129 session
->events_ht
.table
,
1130 LTTNG_UST_EVENT_HT_SIZE
, event_desc
);
1132 cds_hlist_for_each_entry_safe(event
, node
, tmp_node
, head
, hlist
) {
1133 if (event_desc
== event
->desc
) {
1134 event_func(session
, event
);
1141 * Iterate over all event_notifier groups to find the current event
1144 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1146 * Get the list of event_notifiers in the hashtable bucket and
1147 * iterate to find the event_notifier matching this
1150 head
= borrow_hash_table_bucket(
1151 event_notifier_group
->event_notifiers_ht
.table
,
1152 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, event_desc
);
1154 cds_hlist_for_each_entry_safe(event_notifier
, node
, tmp_node
, head
, hlist
) {
1155 if (event_desc
== event_notifier
->desc
) {
1156 event_notifier_func(event_notifier
);
1165 void _unregister_event(struct lttng_session
*session
,
1166 struct lttng_event
*event
)
1168 _lttng_event_unregister(event
);
1172 void _event_enum_destroy(struct lttng_session
*session
,
1173 struct lttng_event
*event
)
1177 /* Destroy enums of the current event. */
1178 for (i
= 0; i
< event
->desc
->nr_fields
; i
++) {
1179 const struct lttng_enum_desc
*enum_desc
;
1180 const struct lttng_event_field
*field
;
1181 struct lttng_enum
*curr_enum
;
1183 field
= &(event
->desc
->fields
[i
]);
1184 switch (field
->type
.atype
) {
1186 enum_desc
= field
->type
.u
.legacy
.basic
.enumeration
.desc
;
1188 case atype_enum_nestable
:
1189 enum_desc
= field
->type
.u
.enum_nestable
.desc
;
1195 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
1197 _lttng_enum_destroy(curr_enum
);
1201 /* Destroy event. */
1202 _lttng_event_destroy(event
);
1206 * Iterate over all the UST sessions to unregister and destroy all probes from
1207 * the probe provider descriptor received as argument. Must me called with the
1210 void lttng_probe_provider_unregister_events(
1211 struct lttng_probe_desc
*provider_desc
)
1214 * Iterate over all events in the probe provider descriptions and sessions
1215 * to queue the unregistration of the events.
1217 probe_provider_event_for_each(provider_desc
, _unregister_event
,
1218 _lttng_event_notifier_unregister
);
1220 /* Wait for grace period. */
1221 synchronize_trace();
1222 /* Prune the unregistration queue. */
1223 __tracepoint_probe_prune_release_queue();
1226 * It is now safe to destroy the events and remove them from the event list
1229 probe_provider_event_for_each(provider_desc
, _event_enum_destroy
,
1230 _lttng_event_notifier_destroy
);
1234 * Create events associated with an event enabler (if not already present),
1235 * and add backward reference from the event to the enabler.
1238 int lttng_event_enabler_ref_events(struct lttng_event_enabler
*event_enabler
)
1240 struct lttng_session
*session
= event_enabler
->chan
->session
;
1241 struct lttng_event
*event
;
1243 if (!lttng_event_enabler_as_enabler(event_enabler
)->enabled
)
1246 /* First ensure that probe events are created for this enabler. */
1247 lttng_create_event_if_missing(event_enabler
);
1249 /* For each event matching enabler in session event list. */
1250 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1251 struct lttng_enabler_ref
*enabler_ref
;
1253 if (!lttng_event_enabler_match_event(event_enabler
, event
))
1256 enabler_ref
= lttng_enabler_ref(&event
->enablers_ref_head
,
1257 lttng_event_enabler_as_enabler(event_enabler
));
1260 * If no backward ref, create it.
1261 * Add backward ref from event to enabler.
1263 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1266 enabler_ref
->ref
= lttng_event_enabler_as_enabler(
1268 cds_list_add(&enabler_ref
->node
,
1269 &event
->enablers_ref_head
);
1273 * Link filter bytecodes if not linked yet.
1275 lttng_enabler_link_bytecode(event
->desc
,
1277 &event
->filter_bytecode_runtime_head
,
1278 <tng_event_enabler_as_enabler(event_enabler
)->filter_bytecode_head
);
1280 /* TODO: merge event context. */
1287 * Called at library load: connect the probe on all enablers matching
1289 * Called with session mutex held.
1291 int lttng_fix_pending_events(void)
1293 struct lttng_session
*session
;
1295 cds_list_for_each_entry(session
, &sessions
, node
) {
1296 lttng_session_lazy_sync_event_enablers(session
);
1301 int lttng_fix_pending_event_notifiers(void)
1303 struct lttng_event_notifier_group
*event_notifier_group
;
1305 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1306 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1312 * For each session of the owner thread, execute pending statedump.
1313 * Only dump state for the sessions owned by the caller thread, because
1314 * we don't keep ust_lock across the entire iteration.
1316 void lttng_handle_pending_statedump(void *owner
)
1318 struct lttng_session
*session
;
1320 /* Execute state dump */
1321 do_lttng_ust_statedump(owner
);
1323 /* Clear pending state dump */
1327 cds_list_for_each_entry(session
, &sessions
, node
) {
1328 if (session
->owner
!= owner
)
1330 if (!session
->statedump_pending
)
1332 session
->statedump_pending
= 0;
1340 * Only used internally at session destruction.
1343 void _lttng_event_destroy(struct lttng_event
*event
)
1345 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
1347 /* Remove from event list. */
1348 cds_list_del(&event
->node
);
1349 /* Remove from event hash table. */
1350 cds_hlist_del(&event
->hlist
);
1352 lttng_destroy_context(event
->ctx
);
1353 lttng_free_event_filter_runtime(event
);
1354 /* Free event enabler refs */
1355 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
1356 &event
->enablers_ref_head
, node
)
1362 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1364 cds_list_del(&_enum
->node
);
1365 cds_hlist_del(&_enum
->hlist
);
1369 void lttng_ust_events_exit(void)
1371 struct lttng_session
*session
, *tmpsession
;
1373 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, node
)
1374 lttng_session_destroy(session
);
1378 * Enabler management.
1380 struct lttng_event_enabler
*lttng_event_enabler_create(
1381 enum lttng_enabler_format_type format_type
,
1382 struct lttng_ust_event
*event_param
,
1383 struct lttng_channel
*chan
)
1385 struct lttng_event_enabler
*event_enabler
;
1387 event_enabler
= zmalloc(sizeof(*event_enabler
));
1390 event_enabler
->base
.format_type
= format_type
;
1391 CDS_INIT_LIST_HEAD(&event_enabler
->base
.filter_bytecode_head
);
1392 CDS_INIT_LIST_HEAD(&event_enabler
->base
.excluder_head
);
1393 memcpy(&event_enabler
->base
.event_param
, event_param
,
1394 sizeof(event_enabler
->base
.event_param
));
1395 event_enabler
->chan
= chan
;
1397 event_enabler
->base
.enabled
= 0;
1398 cds_list_add(&event_enabler
->node
, &event_enabler
->chan
->session
->enablers_head
);
1399 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1401 return event_enabler
;
1404 struct lttng_event_notifier_enabler
*lttng_event_notifier_enabler_create(
1405 struct lttng_event_notifier_group
*event_notifier_group
,
1406 enum lttng_enabler_format_type format_type
,
1407 struct lttng_ust_event_notifier
*event_notifier_param
)
1409 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1411 event_notifier_enabler
= zmalloc(sizeof(*event_notifier_enabler
));
1412 if (!event_notifier_enabler
)
1414 event_notifier_enabler
->base
.format_type
= format_type
;
1415 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.filter_bytecode_head
);
1416 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->capture_bytecode_head
);
1417 CDS_INIT_LIST_HEAD(&event_notifier_enabler
->base
.excluder_head
);
1419 event_notifier_enabler
->user_token
= event_notifier_param
->event
.token
;
1420 event_notifier_enabler
->num_captures
= 0;
1422 memcpy(&event_notifier_enabler
->base
.event_param
.name
,
1423 event_notifier_param
->event
.name
,
1424 sizeof(event_notifier_enabler
->base
.event_param
.name
));
1425 event_notifier_enabler
->base
.event_param
.instrumentation
=
1426 event_notifier_param
->event
.instrumentation
;
1427 event_notifier_enabler
->base
.event_param
.loglevel
=
1428 event_notifier_param
->event
.loglevel
;
1429 event_notifier_enabler
->base
.event_param
.loglevel_type
=
1430 event_notifier_param
->event
.loglevel_type
;
1432 event_notifier_enabler
->base
.enabled
= 0;
1433 event_notifier_enabler
->group
= event_notifier_group
;
1435 cds_list_add(&event_notifier_enabler
->node
,
1436 &event_notifier_group
->enablers_head
);
1438 lttng_event_notifier_group_sync_enablers(event_notifier_group
);
1440 return event_notifier_enabler
;
1443 int lttng_event_enabler_enable(struct lttng_event_enabler
*event_enabler
)
1445 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 1;
1446 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1451 int lttng_event_enabler_disable(struct lttng_event_enabler
*event_enabler
)
1453 lttng_event_enabler_as_enabler(event_enabler
)->enabled
= 0;
1454 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1460 void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler
*enabler
,
1461 struct lttng_ust_bytecode_node
*bytecode
)
1463 bytecode
->enabler
= enabler
;
1464 cds_list_add_tail(&bytecode
->node
, &enabler
->filter_bytecode_head
);
1467 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler
*event_enabler
,
1468 struct lttng_ust_bytecode_node
*bytecode
)
1470 _lttng_enabler_attach_filter_bytecode(
1471 lttng_event_enabler_as_enabler(event_enabler
), bytecode
);
1473 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1478 void _lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1479 struct lttng_ust_excluder_node
*excluder
)
1481 excluder
->enabler
= enabler
;
1482 cds_list_add_tail(&excluder
->node
, &enabler
->excluder_head
);
1485 int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler
*event_enabler
,
1486 struct lttng_ust_excluder_node
*excluder
)
1488 _lttng_enabler_attach_exclusion(
1489 lttng_event_enabler_as_enabler(event_enabler
), excluder
);
1491 lttng_session_lazy_sync_event_enablers(event_enabler
->chan
->session
);
1495 int lttng_event_notifier_enabler_enable(
1496 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1498 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 1;
1499 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1504 int lttng_event_notifier_enabler_disable(
1505 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1507 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
= 0;
1508 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1513 int lttng_event_notifier_enabler_attach_filter_bytecode(
1514 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1515 struct lttng_ust_bytecode_node
*bytecode
)
1517 _lttng_enabler_attach_filter_bytecode(
1518 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1521 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1525 int lttng_event_notifier_enabler_attach_capture_bytecode(
1526 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1527 struct lttng_ust_bytecode_node
*bytecode
)
1529 bytecode
->enabler
= lttng_event_notifier_enabler_as_enabler(
1530 event_notifier_enabler
);
1531 cds_list_add_tail(&bytecode
->node
,
1532 &event_notifier_enabler
->capture_bytecode_head
);
1533 event_notifier_enabler
->num_captures
++;
1535 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1539 int lttng_event_notifier_enabler_attach_exclusion(
1540 struct lttng_event_notifier_enabler
*event_notifier_enabler
,
1541 struct lttng_ust_excluder_node
*excluder
)
1543 _lttng_enabler_attach_exclusion(
1544 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
),
1547 lttng_event_notifier_group_sync_enablers(event_notifier_enabler
->group
);
1551 int lttng_attach_context(struct lttng_ust_context
*context_param
,
1552 union ust_args
*uargs
,
1553 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
1556 * We cannot attach a context after trace has been started for a
1557 * session because the metadata does not allow expressing this
1558 * information outside of the original channel scope.
1560 if (session
->been_active
)
1563 switch (context_param
->ctx
) {
1564 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
1565 return lttng_add_pthread_id_to_ctx(ctx
);
1566 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
1568 struct lttng_ust_perf_counter_ctx
*perf_ctx_param
;
1570 perf_ctx_param
= &context_param
->u
.perf_counter
;
1571 return lttng_add_perf_counter_to_ctx(
1572 perf_ctx_param
->type
,
1573 perf_ctx_param
->config
,
1574 perf_ctx_param
->name
,
1577 case LTTNG_UST_CONTEXT_VTID
:
1578 return lttng_add_vtid_to_ctx(ctx
);
1579 case LTTNG_UST_CONTEXT_VPID
:
1580 return lttng_add_vpid_to_ctx(ctx
);
1581 case LTTNG_UST_CONTEXT_PROCNAME
:
1582 return lttng_add_procname_to_ctx(ctx
);
1583 case LTTNG_UST_CONTEXT_IP
:
1584 return lttng_add_ip_to_ctx(ctx
);
1585 case LTTNG_UST_CONTEXT_CPU_ID
:
1586 return lttng_add_cpu_id_to_ctx(ctx
);
1587 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
1588 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1590 case LTTNG_UST_CONTEXT_CGROUP_NS
:
1591 return lttng_add_cgroup_ns_to_ctx(ctx
);
1592 case LTTNG_UST_CONTEXT_IPC_NS
:
1593 return lttng_add_ipc_ns_to_ctx(ctx
);
1594 case LTTNG_UST_CONTEXT_MNT_NS
:
1595 return lttng_add_mnt_ns_to_ctx(ctx
);
1596 case LTTNG_UST_CONTEXT_NET_NS
:
1597 return lttng_add_net_ns_to_ctx(ctx
);
1598 case LTTNG_UST_CONTEXT_PID_NS
:
1599 return lttng_add_pid_ns_to_ctx(ctx
);
1600 case LTTNG_UST_CONTEXT_TIME_NS
:
1601 return lttng_add_time_ns_to_ctx(ctx
);
1602 case LTTNG_UST_CONTEXT_USER_NS
:
1603 return lttng_add_user_ns_to_ctx(ctx
);
1604 case LTTNG_UST_CONTEXT_UTS_NS
:
1605 return lttng_add_uts_ns_to_ctx(ctx
);
1606 case LTTNG_UST_CONTEXT_VUID
:
1607 return lttng_add_vuid_to_ctx(ctx
);
1608 case LTTNG_UST_CONTEXT_VEUID
:
1609 return lttng_add_veuid_to_ctx(ctx
);
1610 case LTTNG_UST_CONTEXT_VSUID
:
1611 return lttng_add_vsuid_to_ctx(ctx
);
1612 case LTTNG_UST_CONTEXT_VGID
:
1613 return lttng_add_vgid_to_ctx(ctx
);
1614 case LTTNG_UST_CONTEXT_VEGID
:
1615 return lttng_add_vegid_to_ctx(ctx
);
1616 case LTTNG_UST_CONTEXT_VSGID
:
1617 return lttng_add_vsgid_to_ctx(ctx
);
1623 int lttng_event_enabler_attach_context(struct lttng_event_enabler
*enabler
,
1624 struct lttng_ust_context
*context_param
)
1629 void lttng_event_enabler_destroy(struct lttng_event_enabler
*event_enabler
)
1631 if (!event_enabler
) {
1634 cds_list_del(&event_enabler
->node
);
1636 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler
));
1638 lttng_destroy_context(event_enabler
->ctx
);
1639 free(event_enabler
);
1643 * lttng_session_sync_event_enablers should be called just before starting a
1647 void lttng_session_sync_event_enablers(struct lttng_session
*session
)
1649 struct lttng_event_enabler
*event_enabler
;
1650 struct lttng_event
*event
;
1652 cds_list_for_each_entry(event_enabler
, &session
->enablers_head
, node
)
1653 lttng_event_enabler_ref_events(event_enabler
);
1655 * For each event, if at least one of its enablers is enabled,
1656 * and its channel and session transient states are enabled, we
1657 * enable the event, else we disable it.
1659 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1660 struct lttng_enabler_ref
*enabler_ref
;
1661 struct lttng_bytecode_runtime
*runtime
;
1662 int enabled
= 0, has_enablers_without_bytecode
= 0;
1665 cds_list_for_each_entry(enabler_ref
,
1666 &event
->enablers_ref_head
, node
) {
1667 if (enabler_ref
->ref
->enabled
) {
1673 * Enabled state is based on union of enablers, with
1674 * intesection of session and channel transient enable
1677 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1679 CMM_STORE_SHARED(event
->enabled
, enabled
);
1681 * Sync tracepoint registration with event enabled
1685 if (!event
->registered
)
1686 register_event(event
);
1688 if (event
->registered
)
1689 unregister_event(event
);
1692 /* Check if has enablers without bytecode enabled */
1693 cds_list_for_each_entry(enabler_ref
,
1694 &event
->enablers_ref_head
, node
) {
1695 if (enabler_ref
->ref
->enabled
1696 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1697 has_enablers_without_bytecode
= 1;
1701 event
->has_enablers_without_bytecode
=
1702 has_enablers_without_bytecode
;
1704 /* Enable filters */
1705 cds_list_for_each_entry(runtime
,
1706 &event
->filter_bytecode_runtime_head
, node
) {
1707 lttng_bytecode_filter_sync_state(runtime
);
1710 __tracepoint_probe_prune_release_queue();
1714 void lttng_create_event_notifier_if_missing(
1715 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1717 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1718 struct lttng_probe_desc
*probe_desc
;
1719 struct cds_list_head
*probe_list
;
1722 probe_list
= lttng_get_probe_list_head();
1724 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
1725 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
1728 const struct lttng_event_desc
*desc
;
1729 struct lttng_event_notifier
*event_notifier
;
1730 struct cds_hlist_head
*head
;
1731 struct cds_hlist_node
*node
;
1733 desc
= probe_desc
->event_desc
[i
];
1735 if (!lttng_desc_match_enabler(desc
,
1736 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)))
1740 * Given the current event_notifier group, get the bucket that
1741 * the target event_notifier would be if it was already
1744 head
= borrow_hash_table_bucket(
1745 event_notifier_group
->event_notifiers_ht
.table
,
1746 LTTNG_UST_EVENT_NOTIFIER_HT_SIZE
, desc
);
1748 cds_hlist_for_each_entry(event_notifier
, node
, head
, hlist
) {
1750 * Check if event_notifier already exists by checking
1751 * if the event_notifier and enabler share the same
1752 * description and id.
1754 if (event_notifier
->desc
== desc
&&
1755 event_notifier
->user_token
== event_notifier_enabler
->user_token
) {
1765 * We need to create a event_notifier for this event probe.
1767 ret
= lttng_event_notifier_create(desc
,
1768 event_notifier_enabler
->user_token
,
1769 event_notifier_group
);
1771 DBG("Unable to create event_notifier %s, error %d\n",
1772 probe_desc
->event_desc
[i
]->name
, ret
);
1779 * Create event_notifiers associated with a event_notifier enabler (if not already present).
1782 int lttng_event_notifier_enabler_ref_event_notifiers(
1783 struct lttng_event_notifier_enabler
*event_notifier_enabler
)
1785 struct lttng_event_notifier_group
*event_notifier_group
= event_notifier_enabler
->group
;
1786 struct lttng_event_notifier
*event_notifier
;
1789 * Only try to create event_notifiers for enablers that are enabled, the user
1790 * might still be attaching filter or exclusion to the
1791 * event_notifier_enabler.
1793 if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->enabled
)
1796 /* First, ensure that probe event_notifiers are created for this enabler. */
1797 lttng_create_event_notifier_if_missing(event_notifier_enabler
);
1799 /* Link the created event_notifier with its associated enabler. */
1800 cds_list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, node
) {
1801 struct lttng_enabler_ref
*enabler_ref
;
1803 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler
, event_notifier
))
1806 enabler_ref
= lttng_enabler_ref(&event_notifier
->enablers_ref_head
,
1807 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler
));
1810 * If no backward ref, create it.
1811 * Add backward ref from event_notifier to enabler.
1813 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
1817 enabler_ref
->ref
= lttng_event_notifier_enabler_as_enabler(
1818 event_notifier_enabler
);
1819 cds_list_add(&enabler_ref
->node
,
1820 &event_notifier
->enablers_ref_head
);
1824 * Link filter bytecodes if not linked yet.
1826 lttng_enabler_link_bytecode(event_notifier
->desc
,
1827 &event_notifier_group
->ctx
,
1828 &event_notifier
->filter_bytecode_runtime_head
,
1829 <tng_event_notifier_enabler_as_enabler(event_notifier_enabler
)->filter_bytecode_head
);
1832 * Link capture bytecodes if not linked yet.
1834 lttng_enabler_link_bytecode(event_notifier
->desc
,
1835 &event_notifier_group
->ctx
, &event_notifier
->capture_bytecode_runtime_head
,
1836 &event_notifier_enabler
->capture_bytecode_head
);
1838 event_notifier
->num_captures
= event_notifier_enabler
->num_captures
;
1845 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
*event_notifier_group
)
1847 struct lttng_event_notifier_enabler
*event_notifier_enabler
;
1848 struct lttng_event_notifier
*event_notifier
;
1850 cds_list_for_each_entry(event_notifier_enabler
, &event_notifier_group
->enablers_head
, node
)
1851 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler
);
1854 * For each event_notifier, if at least one of its enablers is enabled,
1855 * we enable the event_notifier, else we disable it.
1857 cds_list_for_each_entry(event_notifier
, &event_notifier_group
->event_notifiers_head
, node
) {
1858 struct lttng_enabler_ref
*enabler_ref
;
1859 struct lttng_bytecode_runtime
*runtime
;
1860 int enabled
= 0, has_enablers_without_bytecode
= 0;
1862 /* Enable event_notifiers */
1863 cds_list_for_each_entry(enabler_ref
,
1864 &event_notifier
->enablers_ref_head
, node
) {
1865 if (enabler_ref
->ref
->enabled
) {
1871 CMM_STORE_SHARED(event_notifier
->enabled
, enabled
);
1873 * Sync tracepoint registration with event_notifier enabled
1877 if (!event_notifier
->registered
)
1878 register_event_notifier(event_notifier
);
1880 if (event_notifier
->registered
)
1881 unregister_event_notifier(event_notifier
);
1884 /* Check if has enablers without bytecode enabled */
1885 cds_list_for_each_entry(enabler_ref
,
1886 &event_notifier
->enablers_ref_head
, node
) {
1887 if (enabler_ref
->ref
->enabled
1888 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1889 has_enablers_without_bytecode
= 1;
1893 event_notifier
->has_enablers_without_bytecode
=
1894 has_enablers_without_bytecode
;
1896 /* Enable filters */
1897 cds_list_for_each_entry(runtime
,
1898 &event_notifier
->filter_bytecode_runtime_head
, node
) {
1899 lttng_bytecode_filter_sync_state(runtime
);
1902 /* Enable captures. */
1903 cds_list_for_each_entry(runtime
,
1904 &event_notifier
->capture_bytecode_runtime_head
, node
) {
1905 lttng_bytecode_capture_sync_state(runtime
);
1908 __tracepoint_probe_prune_release_queue();
1912 * Apply enablers to session events, adding events to session if need
1913 * be. It is required after each modification applied to an active
1914 * session, and right before session "start".
1915 * "lazy" sync means we only sync if required.
1918 void lttng_session_lazy_sync_event_enablers(struct lttng_session
*session
)
1920 /* We can skip if session is not active */
1921 if (!session
->active
)
1923 lttng_session_sync_event_enablers(session
);
1927 * Update all sessions with the given app context.
1928 * Called with ust lock held.
1929 * This is invoked when an application context gets loaded/unloaded. It
1930 * ensures the context callbacks are in sync with the application
1931 * context (either app context callbacks, or dummy callbacks).
1933 void lttng_ust_context_set_session_provider(const char *name
,
1934 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1935 void (*record
)(struct lttng_ctx_field
*field
,
1936 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1937 struct lttng_channel
*chan
),
1938 void (*get_value
)(struct lttng_ctx_field
*field
,
1939 struct lttng_ctx_value
*value
))
1941 struct lttng_session
*session
;
1943 cds_list_for_each_entry(session
, &sessions
, node
) {
1944 struct lttng_channel
*chan
;
1945 struct lttng_event
*event
;
1948 ret
= lttng_ust_context_set_provider_rcu(&session
->ctx
,
1949 name
, get_size
, record
, get_value
);
1952 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
1953 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
1954 name
, get_size
, record
, get_value
);
1958 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1959 ret
= lttng_ust_context_set_provider_rcu(&event
->ctx
,
1960 name
, get_size
, record
, get_value
);
1968 * Update all event_notifier groups with the given app context.
1969 * Called with ust lock held.
1970 * This is invoked when an application context gets loaded/unloaded. It
1971 * ensures the context callbacks are in sync with the application
1972 * context (either app context callbacks, or dummy callbacks).
1974 void lttng_ust_context_set_event_notifier_group_provider(const char *name
,
1975 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1976 void (*record
)(struct lttng_ctx_field
*field
,
1977 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1978 struct lttng_channel
*chan
),
1979 void (*get_value
)(struct lttng_ctx_field
*field
,
1980 struct lttng_ctx_value
*value
))
1982 struct lttng_event_notifier_group
*event_notifier_group
;
1984 cds_list_for_each_entry(event_notifier_group
, &event_notifier_groups
, node
) {
1987 ret
= lttng_ust_context_set_provider_rcu(
1988 &event_notifier_group
->ctx
,
1989 name
, get_size
, record
, get_value
);