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
26 #include <urcu/list.h>
27 #include <urcu/hlist.h>
37 #include <lttng/ust-endian.h>
41 #include <urcu/compiler.h>
42 #include <urcu/uatomic.h>
43 #include <urcu/arch.h>
45 #include <lttng/tracepoint.h>
46 #include <lttng/ust-events.h>
48 #include <usterr-signal-safe.h>
50 #include <lttng/ust-ctl.h>
52 #include <lttng/ust-dynamic-type.h>
53 #include <lttng/ust-context-provider.h>
56 #include "lttng-ust-uuid.h"
58 #include "tracepoint-internal.h"
59 #include "string-utils.h"
60 #include "lttng-tracer.h"
61 #include "lttng-tracer-core.h"
62 #include "lttng-ust-statedump.h"
64 #include "../libringbuffer/shm.h"
68 * All operations within this file are called by the communication
69 * thread, under ust_lock protection.
72 static CDS_LIST_HEAD(sessions
);
74 struct cds_list_head
*_lttng_get_sessions(void)
79 static void _lttng_event_destroy(struct lttng_event
*event
);
80 static void _lttng_enum_destroy(struct lttng_enum
*_enum
);
83 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
);
85 void lttng_session_sync_enablers(struct lttng_session
*session
);
87 void lttng_enabler_destroy(struct lttng_enabler
*enabler
);
90 * Called with ust lock held.
92 int lttng_session_active(void)
94 struct lttng_session
*iter
;
96 cds_list_for_each_entry(iter
, &sessions
, node
) {
104 int lttng_loglevel_match(int loglevel
,
105 unsigned int has_loglevel
,
106 enum lttng_ust_loglevel_type req_type
,
110 loglevel
= TRACE_DEFAULT
;
112 case LTTNG_UST_LOGLEVEL_RANGE
:
113 if (loglevel
<= req_loglevel
114 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
118 case LTTNG_UST_LOGLEVEL_SINGLE
:
119 if (loglevel
== req_loglevel
120 || (req_loglevel
== -1 && loglevel
<= TRACE_DEBUG
))
124 case LTTNG_UST_LOGLEVEL_ALL
:
126 if (loglevel
<= TRACE_DEBUG
)
133 void synchronize_trace(void)
138 struct lttng_session
*lttng_session_create(void)
140 struct lttng_session
*session
;
143 session
= zmalloc(sizeof(struct lttng_session
));
146 if (lttng_session_context_init(&session
->ctx
)) {
150 CDS_INIT_LIST_HEAD(&session
->chan_head
);
151 CDS_INIT_LIST_HEAD(&session
->events_head
);
152 CDS_INIT_LIST_HEAD(&session
->enums_head
);
153 CDS_INIT_LIST_HEAD(&session
->enablers_head
);
154 for (i
= 0; i
< LTTNG_UST_EVENT_HT_SIZE
; i
++)
155 CDS_INIT_HLIST_HEAD(&session
->events_ht
.table
[i
]);
156 for (i
= 0; i
< LTTNG_UST_ENUM_HT_SIZE
; i
++)
157 CDS_INIT_HLIST_HEAD(&session
->enums_ht
.table
[i
]);
158 cds_list_add(&session
->node
, &sessions
);
163 * Only used internally at session destruction.
166 void _lttng_channel_unmap(struct lttng_channel
*lttng_chan
)
168 struct channel
*chan
;
169 struct lttng_ust_shm_handle
*handle
;
171 cds_list_del(<tng_chan
->node
);
172 lttng_destroy_context(lttng_chan
->ctx
);
173 chan
= lttng_chan
->chan
;
174 handle
= lttng_chan
->handle
;
176 * note: lttng_chan is private data contained within handle. It
177 * will be freed along with the handle.
179 channel_destroy(chan
, handle
, 0);
183 void register_event(struct lttng_event
*event
)
186 const struct lttng_event_desc
*desc
;
188 assert(event
->registered
== 0);
190 ret
= __tracepoint_probe_register_queue_release(desc
->name
,
191 desc
->probe_callback
,
192 event
, desc
->signature
);
195 event
->registered
= 1;
199 void unregister_event(struct lttng_event
*event
)
202 const struct lttng_event_desc
*desc
;
204 assert(event
->registered
== 1);
206 ret
= __tracepoint_probe_unregister_queue_release(desc
->name
,
207 desc
->probe_callback
,
211 event
->registered
= 0;
215 * Only used internally at session destruction.
218 void _lttng_event_unregister(struct lttng_event
*event
)
220 if (event
->registered
)
221 unregister_event(event
);
224 void lttng_session_destroy(struct lttng_session
*session
)
226 struct lttng_channel
*chan
, *tmpchan
;
227 struct lttng_event
*event
, *tmpevent
;
228 struct lttng_enum
*_enum
, *tmp_enum
;
229 struct lttng_enabler
*enabler
, *tmpenabler
;
231 CMM_ACCESS_ONCE(session
->active
) = 0;
232 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
233 _lttng_event_unregister(event
);
235 synchronize_trace(); /* Wait for in-flight events to complete */
236 __tracepoint_probe_prune_release_queue();
237 cds_list_for_each_entry_safe(enabler
, tmpenabler
,
238 &session
->enablers_head
, node
)
239 lttng_enabler_destroy(enabler
);
240 cds_list_for_each_entry_safe(event
, tmpevent
,
241 &session
->events_head
, node
)
242 _lttng_event_destroy(event
);
243 cds_list_for_each_entry_safe(_enum
, tmp_enum
,
244 &session
->enums_head
, node
)
245 _lttng_enum_destroy(_enum
);
246 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->chan_head
, node
)
247 _lttng_channel_unmap(chan
);
248 cds_list_del(&session
->node
);
249 lttng_destroy_context(session
->ctx
);
254 int lttng_enum_create(const struct lttng_enum_desc
*desc
,
255 struct lttng_session
*session
)
257 const char *enum_name
= desc
->name
;
258 struct lttng_enum
*_enum
;
259 struct cds_hlist_head
*head
;
261 size_t name_len
= strlen(enum_name
);
265 /* Check if this enum is already registered for this session. */
266 hash
= jhash(enum_name
, name_len
, 0);
267 head
= &session
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
269 _enum
= lttng_ust_enum_get_from_desc(session
, desc
);
275 notify_socket
= lttng_get_notify_socket(session
->owner
);
276 if (notify_socket
< 0) {
281 _enum
= zmalloc(sizeof(*_enum
));
286 _enum
->session
= session
;
289 ret
= ustcomm_register_enum(notify_socket
,
296 DBG("Error (%d) registering enumeration to sessiond", ret
);
297 goto sessiond_register_error
;
299 cds_list_add(&_enum
->node
, &session
->enums_head
);
300 cds_hlist_add_head(&_enum
->hlist
, head
);
303 sessiond_register_error
:
312 int lttng_create_enum_check(const struct lttng_type
*type
,
313 struct lttng_session
*session
)
315 switch (type
->atype
) {
318 const struct lttng_enum_desc
*enum_desc
;
321 enum_desc
= type
->u
.basic
.enumeration
.desc
;
322 ret
= lttng_enum_create(enum_desc
, session
);
323 if (ret
&& ret
!= -EEXIST
) {
324 DBG("Unable to create enum error: (%d)", ret
);
331 const struct lttng_event_field
*tag_field_generic
;
332 const struct lttng_enum_desc
*enum_desc
;
335 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
336 enum_desc
= tag_field_generic
->type
.u
.basic
.enumeration
.desc
;
337 ret
= lttng_enum_create(enum_desc
, session
);
338 if (ret
&& ret
!= -EEXIST
) {
339 DBG("Unable to create enum error: (%d)", ret
);
345 /* TODO: nested types when they become supported. */
352 int lttng_create_all_event_enums(size_t nr_fields
,
353 const struct lttng_event_field
*event_fields
,
354 struct lttng_session
*session
)
359 /* For each field, ensure enum is part of the session. */
360 for (i
= 0; i
< nr_fields
; i
++) {
361 const struct lttng_type
*type
= &event_fields
[i
].type
;
363 ret
= lttng_create_enum_check(type
, session
);
371 int lttng_create_all_ctx_enums(size_t nr_fields
,
372 const struct lttng_ctx_field
*ctx_fields
,
373 struct lttng_session
*session
)
378 /* For each field, ensure enum is part of the session. */
379 for (i
= 0; i
< nr_fields
; i
++) {
380 const struct lttng_type
*type
= &ctx_fields
[i
].event_field
.type
;
382 ret
= lttng_create_enum_check(type
, session
);
390 * Ensure that a state-dump will be performed for this session at the end
391 * of the current handle_message().
393 int lttng_session_statedump(struct lttng_session
*session
)
395 session
->statedump_pending
= 1;
396 lttng_ust_sockinfo_session_enabled(session
->owner
);
400 int lttng_session_enable(struct lttng_session
*session
)
403 struct lttng_channel
*chan
;
406 if (session
->active
) {
411 notify_socket
= lttng_get_notify_socket(session
->owner
);
412 if (notify_socket
< 0)
413 return notify_socket
;
415 /* Set transient enabler state to "enabled" */
418 /* We need to sync enablers with session before activation. */
419 lttng_session_sync_enablers(session
);
422 * Snapshot the number of events per channel to know the type of header
425 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
426 const struct lttng_ctx
*ctx
;
427 const struct lttng_ctx_field
*fields
= NULL
;
428 size_t nr_fields
= 0;
431 /* don't change it if session stop/restart */
432 if (chan
->header_type
)
436 nr_fields
= ctx
->nr_fields
;
437 fields
= ctx
->fields
;
438 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
441 DBG("Error (%d) adding enum to session", ret
);
445 ret
= ustcomm_register_channel(notify_socket
,
454 DBG("Error (%d) registering channel to sessiond", ret
);
457 if (chan_id
!= chan
->id
) {
458 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
464 /* Set atomically the state to "active" */
465 CMM_ACCESS_ONCE(session
->active
) = 1;
466 CMM_ACCESS_ONCE(session
->been_active
) = 1;
468 ret
= lttng_session_statedump(session
);
475 int lttng_session_disable(struct lttng_session
*session
)
479 if (!session
->active
) {
483 /* Set atomically the state to "inactive" */
484 CMM_ACCESS_ONCE(session
->active
) = 0;
486 /* Set transient enabler state to "disabled" */
488 lttng_session_sync_enablers(session
);
493 int lttng_channel_enable(struct lttng_channel
*channel
)
497 if (channel
->enabled
) {
501 /* Set transient enabler state to "enabled" */
503 lttng_session_sync_enablers(channel
->session
);
504 /* Set atomically the state to "enabled" */
505 CMM_ACCESS_ONCE(channel
->enabled
) = 1;
510 int lttng_channel_disable(struct lttng_channel
*channel
)
514 if (!channel
->enabled
) {
518 /* Set atomically the state to "disabled" */
519 CMM_ACCESS_ONCE(channel
->enabled
) = 0;
520 /* Set transient enabler state to "enabled" */
522 lttng_session_sync_enablers(channel
->session
);
528 * Supports event creation while tracing session is active.
531 int lttng_event_create(const struct lttng_event_desc
*desc
,
532 struct lttng_channel
*chan
)
534 const char *event_name
= desc
->name
;
535 struct lttng_event
*event
;
536 struct lttng_session
*session
= chan
->session
;
537 struct cds_hlist_head
*head
;
539 size_t name_len
= strlen(event_name
);
541 int notify_socket
, loglevel
;
544 hash
= jhash(event_name
, name_len
, 0);
545 head
= &chan
->session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
547 notify_socket
= lttng_get_notify_socket(session
->owner
);
548 if (notify_socket
< 0) {
553 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
556 DBG("Error (%d) adding enum to session", ret
);
557 goto create_enum_error
;
561 * Check if loglevel match. Refuse to connect event if not.
563 event
= zmalloc(sizeof(struct lttng_event
));
570 /* Event will be enabled by enabler sync. */
572 event
->registered
= 0;
573 CDS_INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
574 CDS_INIT_LIST_HEAD(&event
->enablers_ref_head
);
578 loglevel
= *(*event
->desc
->loglevel
);
580 loglevel
= TRACE_DEFAULT
;
581 if (desc
->u
.ext
.model_emf_uri
)
582 uri
= *(desc
->u
.ext
.model_emf_uri
);
586 /* Fetch event ID from sessiond */
587 ret
= ustcomm_register_event(notify_socket
,
599 DBG("Error (%d) registering event to sessiond", ret
);
600 goto sessiond_register_error
;
603 cds_list_add(&event
->node
, &chan
->session
->events_head
);
604 cds_hlist_add_head(&event
->hlist
, head
);
607 sessiond_register_error
:
616 int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc
*desc
,
617 struct lttng_enabler
*enabler
)
620 unsigned int has_loglevel
= 0;
622 assert(enabler
->type
== LTTNG_ENABLER_STAR_GLOB
);
623 if (!strutils_star_glob_match(enabler
->event_param
.name
, SIZE_MAX
,
624 desc
->name
, SIZE_MAX
))
626 if (desc
->loglevel
) {
627 loglevel
= *(*desc
->loglevel
);
630 if (!lttng_loglevel_match(loglevel
,
632 enabler
->event_param
.loglevel_type
,
633 enabler
->event_param
.loglevel
))
639 int lttng_desc_match_event_enabler(const struct lttng_event_desc
*desc
,
640 struct lttng_enabler
*enabler
)
643 unsigned int has_loglevel
= 0;
645 assert(enabler
->type
== LTTNG_ENABLER_EVENT
);
646 if (strcmp(desc
->name
, enabler
->event_param
.name
))
648 if (desc
->loglevel
) {
649 loglevel
= *(*desc
->loglevel
);
652 if (!lttng_loglevel_match(loglevel
,
654 enabler
->event_param
.loglevel_type
,
655 enabler
->event_param
.loglevel
))
661 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
662 struct lttng_enabler
*enabler
)
664 switch (enabler
->type
) {
665 case LTTNG_ENABLER_STAR_GLOB
:
667 struct lttng_ust_excluder_node
*excluder
;
669 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
674 * If the matching event matches with an excluder,
675 * return 'does not match'
677 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
680 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
684 excluder_name
= (char *) (excluder
->excluder
.names
)
685 + count
* LTTNG_UST_SYM_NAME_LEN
;
686 len
= strnlen(excluder_name
, LTTNG_UST_SYM_NAME_LEN
);
687 if (len
> 0 && strutils_star_glob_match(excluder_name
, len
, desc
->name
, SIZE_MAX
))
693 case LTTNG_ENABLER_EVENT
:
694 return lttng_desc_match_event_enabler(desc
, enabler
);
701 int lttng_event_match_enabler(struct lttng_event
*event
,
702 struct lttng_enabler
*enabler
)
704 if (lttng_desc_match_enabler(event
->desc
, enabler
)
705 && event
->chan
== enabler
->chan
)
712 struct lttng_enabler_ref
* lttng_event_enabler_ref(struct lttng_event
*event
,
713 struct lttng_enabler
*enabler
)
715 struct lttng_enabler_ref
*enabler_ref
;
717 cds_list_for_each_entry(enabler_ref
,
718 &event
->enablers_ref_head
, node
) {
719 if (enabler_ref
->ref
== enabler
)
726 * Create struct lttng_event if it is missing and present in the list of
730 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
732 struct lttng_session
*session
= enabler
->chan
->session
;
733 struct lttng_probe_desc
*probe_desc
;
734 const struct lttng_event_desc
*desc
;
735 struct lttng_event
*event
;
737 struct cds_list_head
*probe_list
;
739 probe_list
= lttng_get_probe_list_head();
741 * For each probe event, if we find that a probe event matches
742 * our enabler, create an associated lttng_event if not
745 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
746 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
748 struct cds_hlist_head
*head
;
749 struct cds_hlist_node
*node
;
750 const char *event_name
;
754 desc
= probe_desc
->event_desc
[i
];
755 if (!lttng_desc_match_enabler(desc
, enabler
))
757 event_name
= desc
->name
;
758 name_len
= strlen(event_name
);
761 * Check if already created.
763 hash
= jhash(event_name
, name_len
, 0);
764 head
= &session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
765 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
766 if (event
->desc
== desc
767 && event
->chan
== enabler
->chan
)
774 * We need to create an event for this
777 ret
= lttng_event_create(probe_desc
->event_desc
[i
],
780 DBG("Unable to create event %s, error %d\n",
781 probe_desc
->event_desc
[i
]->name
, ret
);
788 * Iterate over all the UST sessions to unregister and destroy all probes from
789 * the probe provider descriptor received as argument. Must me called with the
792 void lttng_probe_provider_unregister_events(struct lttng_probe_desc
*provider_desc
)
794 struct cds_hlist_node
*node
, *tmp_node
;
795 struct cds_list_head
*sessionsp
;
796 struct lttng_session
*session
;
797 struct cds_hlist_head
*head
;
798 struct lttng_event
*event
;
801 /* Get handle on list of sessions. */
802 sessionsp
= _lttng_get_sessions();
805 * Iterate over all events in the probe provider descriptions and sessions
806 * to queue the unregistration of the events.
808 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
809 const struct lttng_event_desc
*event_desc
;
810 const char *event_name
;
814 event_desc
= provider_desc
->event_desc
[i
];
815 event_name
= event_desc
->name
;
816 name_len
= strlen(event_name
);
817 hash
= jhash(event_name
, name_len
, 0);
819 /* Iterate over all session to find the current event description. */
820 cds_list_for_each_entry(session
, sessionsp
, node
) {
822 * Get the list of events in the hashtable bucket and iterate to
823 * find the event matching this descriptor.
825 head
= &session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
826 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
827 if (event_desc
== event
->desc
) {
828 /* Queue the unregistration of this event. */
829 _lttng_event_unregister(event
);
836 /* Wait for grace period. */
838 /* Prune the unregistration queue. */
839 __tracepoint_probe_prune_release_queue();
842 * It is now safe to destroy the events and remove them from the event list
845 for (i
= 0; i
< provider_desc
->nr_events
; i
++) {
846 const struct lttng_event_desc
*event_desc
;
847 const char *event_name
;
851 event_desc
= provider_desc
->event_desc
[i
];
852 event_name
= event_desc
->name
;
853 name_len
= strlen(event_name
);
854 hash
= jhash(event_name
, name_len
, 0);
856 /* Iterate over all sessions to find the current event description. */
857 cds_list_for_each_entry(session
, sessionsp
, node
) {
859 * Get the list of events in the hashtable bucket and iterate to
860 * find the event matching this descriptor.
862 head
= &session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
863 cds_hlist_for_each_entry_safe(event
, node
, tmp_node
, head
, hlist
) {
864 if (event_desc
== event
->desc
) {
865 /* Destroy enums of the current event. */
866 for (j
= 0; j
< event
->desc
->nr_fields
; j
++) {
867 const struct lttng_enum_desc
*enum_desc
;
868 const struct lttng_event_field
*field
;
869 struct lttng_enum
*curr_enum
;
871 field
= &(event
->desc
->fields
[j
]);
872 if (field
->type
.atype
!= atype_enum
) {
876 enum_desc
= field
->type
.u
.basic
.enumeration
.desc
;
877 curr_enum
= lttng_ust_enum_get_from_desc(session
, enum_desc
);
879 _lttng_enum_destroy(curr_enum
);
884 _lttng_event_destroy(event
);
893 * Create events associated with an enabler (if not already present),
894 * and add backward reference from the event to the enabler.
897 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
899 struct lttng_session
*session
= enabler
->chan
->session
;
900 struct lttng_event
*event
;
902 /* First ensure that probe events are created for this enabler. */
903 lttng_create_event_if_missing(enabler
);
905 /* For each event matching enabler in session event list. */
906 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
907 struct lttng_enabler_ref
*enabler_ref
;
909 if (!lttng_event_match_enabler(event
, enabler
))
912 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
915 * If no backward ref, create it.
916 * Add backward ref from event to enabler.
918 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
921 enabler_ref
->ref
= enabler
;
922 cds_list_add(&enabler_ref
->node
,
923 &event
->enablers_ref_head
);
927 * Link filter bytecodes if not linked yet.
929 lttng_enabler_event_link_bytecode(event
, enabler
);
931 /* TODO: merge event context. */
937 * Called at library load: connect the probe on all enablers matching
939 * Called with session mutex held.
941 int lttng_fix_pending_events(void)
943 struct lttng_session
*session
;
945 cds_list_for_each_entry(session
, &sessions
, node
) {
946 lttng_session_lazy_sync_enablers(session
);
952 * For each session of the owner thread, execute pending statedump.
953 * Only dump state for the sessions owned by the caller thread, because
954 * we don't keep ust_lock across the entire iteration.
956 void lttng_handle_pending_statedump(void *owner
)
958 struct lttng_session
*session
;
960 /* Execute state dump */
961 do_lttng_ust_statedump(owner
);
963 /* Clear pending state dump */
967 cds_list_for_each_entry(session
, &sessions
, node
) {
968 if (session
->owner
!= owner
)
970 if (!session
->statedump_pending
)
972 session
->statedump_pending
= 0;
980 * Only used internally at session destruction.
983 void _lttng_event_destroy(struct lttng_event
*event
)
985 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
987 /* Remove from event list. */
988 cds_list_del(&event
->node
);
989 /* Remove from event hash table. */
990 cds_hlist_del(&event
->hlist
);
992 lttng_destroy_context(event
->ctx
);
993 lttng_free_event_filter_runtime(event
);
994 /* Free event enabler refs */
995 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
996 &event
->enablers_ref_head
, node
)
1002 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
1004 cds_list_del(&_enum
->node
);
1005 cds_hlist_del(&_enum
->hlist
);
1009 void lttng_ust_events_exit(void)
1011 struct lttng_session
*session
, *tmpsession
;
1013 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, node
)
1014 lttng_session_destroy(session
);
1018 * Enabler management.
1020 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
1021 struct lttng_ust_event
*event_param
,
1022 struct lttng_channel
*chan
)
1024 struct lttng_enabler
*enabler
;
1026 enabler
= zmalloc(sizeof(*enabler
));
1029 enabler
->type
= type
;
1030 CDS_INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
1031 CDS_INIT_LIST_HEAD(&enabler
->excluder_head
);
1032 memcpy(&enabler
->event_param
, event_param
,
1033 sizeof(enabler
->event_param
));
1034 enabler
->chan
= chan
;
1036 enabler
->enabled
= 0;
1037 cds_list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
1038 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1042 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
1044 enabler
->enabled
= 1;
1045 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1049 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
1051 enabler
->enabled
= 0;
1052 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1056 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
1057 struct lttng_ust_filter_bytecode_node
*bytecode
)
1059 bytecode
->enabler
= enabler
;
1060 cds_list_add_tail(&bytecode
->node
, &enabler
->filter_bytecode_head
);
1061 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1065 int lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
1066 struct lttng_ust_excluder_node
*excluder
)
1068 excluder
->enabler
= enabler
;
1069 cds_list_add_tail(&excluder
->node
, &enabler
->excluder_head
);
1070 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1074 int lttng_attach_context(struct lttng_ust_context
*context_param
,
1075 union ust_args
*uargs
,
1076 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
1079 * We cannot attach a context after trace has been started for a
1080 * session because the metadata does not allow expressing this
1081 * information outside of the original channel scope.
1083 if (session
->been_active
)
1086 switch (context_param
->ctx
) {
1087 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
1088 return lttng_add_pthread_id_to_ctx(ctx
);
1089 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
1091 struct lttng_ust_perf_counter_ctx
*perf_ctx_param
;
1093 perf_ctx_param
= &context_param
->u
.perf_counter
;
1094 return lttng_add_perf_counter_to_ctx(
1095 perf_ctx_param
->type
,
1096 perf_ctx_param
->config
,
1097 perf_ctx_param
->name
,
1100 case LTTNG_UST_CONTEXT_VTID
:
1101 return lttng_add_vtid_to_ctx(ctx
);
1102 case LTTNG_UST_CONTEXT_VPID
:
1103 return lttng_add_vpid_to_ctx(ctx
);
1104 case LTTNG_UST_CONTEXT_PROCNAME
:
1105 return lttng_add_procname_to_ctx(ctx
);
1106 case LTTNG_UST_CONTEXT_IP
:
1107 return lttng_add_ip_to_ctx(ctx
);
1108 case LTTNG_UST_CONTEXT_CPU_ID
:
1109 return lttng_add_cpu_id_to_ctx(ctx
);
1110 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
1111 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1113 case LTTNG_UST_CONTEXT_CGROUP_NS
:
1114 return lttng_add_cgroup_ns_to_ctx(ctx
);
1115 case LTTNG_UST_CONTEXT_IPC_NS
:
1116 return lttng_add_ipc_ns_to_ctx(ctx
);
1117 case LTTNG_UST_CONTEXT_MNT_NS
:
1118 return lttng_add_mnt_ns_to_ctx(ctx
);
1119 case LTTNG_UST_CONTEXT_NET_NS
:
1120 return lttng_add_net_ns_to_ctx(ctx
);
1121 case LTTNG_UST_CONTEXT_PID_NS
:
1122 return lttng_add_pid_ns_to_ctx(ctx
);
1123 case LTTNG_UST_CONTEXT_USER_NS
:
1124 return lttng_add_user_ns_to_ctx(ctx
);
1125 case LTTNG_UST_CONTEXT_UTS_NS
:
1126 return lttng_add_uts_ns_to_ctx(ctx
);
1127 case LTTNG_UST_CONTEXT_VUID
:
1128 return lttng_add_vuid_to_ctx(ctx
);
1129 case LTTNG_UST_CONTEXT_VEUID
:
1130 return lttng_add_veuid_to_ctx(ctx
);
1131 case LTTNG_UST_CONTEXT_VSUID
:
1132 return lttng_add_vsuid_to_ctx(ctx
);
1133 case LTTNG_UST_CONTEXT_VGID
:
1134 return lttng_add_vgid_to_ctx(ctx
);
1135 case LTTNG_UST_CONTEXT_VEGID
:
1136 return lttng_add_vegid_to_ctx(ctx
);
1137 case LTTNG_UST_CONTEXT_VSGID
:
1138 return lttng_add_vsgid_to_ctx(ctx
);
1144 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1145 struct lttng_ust_context
*context_param
)
1147 #if 0 // disabled for now.
1148 struct lttng_session
*session
= enabler
->chan
->session
;
1151 ret
= lttng_attach_context(context_param
, &enabler
->ctx
,
1155 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1161 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1163 struct lttng_ust_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1164 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
1166 /* Destroy filter bytecode */
1167 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1168 &enabler
->filter_bytecode_head
, node
) {
1172 /* Destroy excluders */
1173 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
1174 &enabler
->excluder_head
, node
) {
1175 free(excluder_node
);
1178 /* Destroy contexts */
1179 lttng_destroy_context(enabler
->ctx
);
1181 cds_list_del(&enabler
->node
);
1186 * lttng_session_sync_enablers should be called just before starting a
1190 void lttng_session_sync_enablers(struct lttng_session
*session
)
1192 struct lttng_enabler
*enabler
;
1193 struct lttng_event
*event
;
1195 cds_list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1196 lttng_enabler_ref_events(enabler
);
1198 * For each event, if at least one of its enablers is enabled,
1199 * and its channel and session transient states are enabled, we
1200 * enable the event, else we disable it.
1202 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1203 struct lttng_enabler_ref
*enabler_ref
;
1204 struct lttng_bytecode_runtime
*runtime
;
1205 int enabled
= 0, has_enablers_without_bytecode
= 0;
1208 cds_list_for_each_entry(enabler_ref
,
1209 &event
->enablers_ref_head
, node
) {
1210 if (enabler_ref
->ref
->enabled
) {
1216 * Enabled state is based on union of enablers, with
1217 * intesection of session and channel transient enable
1220 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1222 CMM_STORE_SHARED(event
->enabled
, enabled
);
1224 * Sync tracepoint registration with event enabled
1228 if (!event
->registered
)
1229 register_event(event
);
1231 if (event
->registered
)
1232 unregister_event(event
);
1235 /* Check if has enablers without bytecode enabled */
1236 cds_list_for_each_entry(enabler_ref
,
1237 &event
->enablers_ref_head
, node
) {
1238 if (enabler_ref
->ref
->enabled
1239 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1240 has_enablers_without_bytecode
= 1;
1244 event
->has_enablers_without_bytecode
=
1245 has_enablers_without_bytecode
;
1247 /* Enable filters */
1248 cds_list_for_each_entry(runtime
,
1249 &event
->bytecode_runtime_head
, node
) {
1250 lttng_filter_sync_state(runtime
);
1253 __tracepoint_probe_prune_release_queue();
1257 * Apply enablers to session events, adding events to session if need
1258 * be. It is required after each modification applied to an active
1259 * session, and right before session "start".
1260 * "lazy" sync means we only sync if required.
1263 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1265 /* We can skip if session is not active */
1266 if (!session
->active
)
1268 lttng_session_sync_enablers(session
);
1272 * Update all sessions with the given app context.
1273 * Called with ust lock held.
1274 * This is invoked when an application context gets loaded/unloaded. It
1275 * ensures the context callbacks are in sync with the application
1276 * context (either app context callbacks, or dummy callbacks).
1278 void lttng_ust_context_set_session_provider(const char *name
,
1279 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1280 void (*record
)(struct lttng_ctx_field
*field
,
1281 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1282 struct lttng_channel
*chan
),
1283 void (*get_value
)(struct lttng_ctx_field
*field
,
1284 struct lttng_ctx_value
*value
))
1286 struct lttng_session
*session
;
1288 cds_list_for_each_entry(session
, &sessions
, node
) {
1289 struct lttng_channel
*chan
;
1290 struct lttng_event
*event
;
1293 ret
= lttng_ust_context_set_provider_rcu(&session
->ctx
,
1294 name
, get_size
, record
, get_value
);
1297 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
1298 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
1299 name
, get_size
, record
, get_value
);
1303 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1304 ret
= lttng_ust_context_set_provider_rcu(&event
->ctx
,
1305 name
, get_size
, record
, get_value
);