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
;
260 struct cds_hlist_node
*node
;
262 size_t name_len
= strlen(enum_name
);
266 hash
= jhash(enum_name
, name_len
, 0);
267 head
= &session
->enums_ht
.table
[hash
& (LTTNG_UST_ENUM_HT_SIZE
- 1)];
268 cds_hlist_for_each_entry(_enum
, node
, head
, hlist
) {
270 if (!strncmp(_enum
->desc
->name
, desc
->name
,
271 LTTNG_UST_SYM_NAME_LEN
- 1)) {
277 notify_socket
= lttng_get_notify_socket(session
->owner
);
278 if (notify_socket
< 0) {
283 _enum
= zmalloc(sizeof(*_enum
));
288 _enum
->session
= session
;
291 ret
= ustcomm_register_enum(notify_socket
,
298 DBG("Error (%d) registering enumeration to sessiond", ret
);
299 goto sessiond_register_error
;
301 cds_list_add(&_enum
->node
, &session
->enums_head
);
302 cds_hlist_add_head(&_enum
->hlist
, head
);
305 sessiond_register_error
:
314 int lttng_create_enum_check(const struct lttng_type
*type
,
315 struct lttng_session
*session
)
317 switch (type
->atype
) {
320 const struct lttng_enum_desc
*enum_desc
;
323 enum_desc
= type
->u
.basic
.enumeration
.desc
;
324 ret
= lttng_enum_create(enum_desc
, session
);
325 if (ret
&& ret
!= -EEXIST
) {
326 DBG("Unable to create enum error: (%d)", ret
);
333 const struct lttng_event_field
*tag_field_generic
;
334 const struct lttng_enum_desc
*enum_desc
;
337 tag_field_generic
= lttng_ust_dynamic_type_tag_field();
338 enum_desc
= tag_field_generic
->type
.u
.basic
.enumeration
.desc
;
339 ret
= lttng_enum_create(enum_desc
, session
);
340 if (ret
&& ret
!= -EEXIST
) {
341 DBG("Unable to create enum error: (%d)", ret
);
347 /* TODO: nested types when they become supported. */
354 int lttng_create_all_event_enums(size_t nr_fields
,
355 const struct lttng_event_field
*event_fields
,
356 struct lttng_session
*session
)
361 /* For each field, ensure enum is part of the session. */
362 for (i
= 0; i
< nr_fields
; i
++) {
363 const struct lttng_type
*type
= &event_fields
[i
].type
;
365 ret
= lttng_create_enum_check(type
, session
);
373 int lttng_create_all_ctx_enums(size_t nr_fields
,
374 const struct lttng_ctx_field
*ctx_fields
,
375 struct lttng_session
*session
)
380 /* For each field, ensure enum is part of the session. */
381 for (i
= 0; i
< nr_fields
; i
++) {
382 const struct lttng_type
*type
= &ctx_fields
[i
].event_field
.type
;
384 ret
= lttng_create_enum_check(type
, session
);
392 * Ensure that a state-dump will be performed for this session at the end
393 * of the current handle_message().
395 int lttng_session_statedump(struct lttng_session
*session
)
397 session
->statedump_pending
= 1;
398 lttng_ust_sockinfo_session_enabled(session
->owner
);
402 int lttng_session_enable(struct lttng_session
*session
)
405 struct lttng_channel
*chan
;
408 if (session
->active
) {
413 notify_socket
= lttng_get_notify_socket(session
->owner
);
414 if (notify_socket
< 0)
415 return notify_socket
;
417 /* Set transient enabler state to "enabled" */
421 * Snapshot the number of events per channel to know the type of header
424 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
425 const struct lttng_ctx
*ctx
;
426 const struct lttng_ctx_field
*fields
= NULL
;
427 size_t nr_fields
= 0;
430 /* don't change it if session stop/restart */
431 if (chan
->header_type
)
435 nr_fields
= ctx
->nr_fields
;
436 fields
= ctx
->fields
;
437 ret
= lttng_create_all_ctx_enums(nr_fields
, fields
,
440 DBG("Error (%d) adding enum to session", ret
);
444 ret
= ustcomm_register_channel(notify_socket
,
453 DBG("Error (%d) registering channel to sessiond", ret
);
456 if (chan_id
!= chan
->id
) {
457 DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
463 /* We need to sync enablers with session before activation. */
464 lttng_session_sync_enablers(session
);
466 /* Set atomically the state to "active" */
467 CMM_ACCESS_ONCE(session
->active
) = 1;
468 CMM_ACCESS_ONCE(session
->been_active
) = 1;
470 ret
= lttng_session_statedump(session
);
477 int lttng_session_disable(struct lttng_session
*session
)
481 if (!session
->active
) {
485 /* Set atomically the state to "inactive" */
486 CMM_ACCESS_ONCE(session
->active
) = 0;
488 /* Set transient enabler state to "disabled" */
490 lttng_session_sync_enablers(session
);
495 int lttng_channel_enable(struct lttng_channel
*channel
)
499 if (channel
->enabled
) {
503 /* Set transient enabler state to "enabled" */
505 lttng_session_sync_enablers(channel
->session
);
506 /* Set atomically the state to "enabled" */
507 CMM_ACCESS_ONCE(channel
->enabled
) = 1;
512 int lttng_channel_disable(struct lttng_channel
*channel
)
516 if (!channel
->enabled
) {
520 /* Set atomically the state to "disabled" */
521 CMM_ACCESS_ONCE(channel
->enabled
) = 0;
522 /* Set transient enabler state to "enabled" */
524 lttng_session_sync_enablers(channel
->session
);
530 * Supports event creation while tracing session is active.
533 int lttng_event_create(const struct lttng_event_desc
*desc
,
534 struct lttng_channel
*chan
)
536 const char *event_name
= desc
->name
;
537 struct lttng_event
*event
;
538 struct lttng_session
*session
= chan
->session
;
539 struct cds_hlist_head
*head
;
540 struct cds_hlist_node
*node
;
542 size_t name_len
= strlen(event_name
);
544 int notify_socket
, loglevel
;
547 hash
= jhash(event_name
, name_len
, 0);
548 head
= &chan
->session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
549 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
551 if (!strncmp(event
->desc
->name
, desc
->name
,
552 LTTNG_UST_SYM_NAME_LEN
- 1)
553 && chan
== event
->chan
) {
559 notify_socket
= lttng_get_notify_socket(session
->owner
);
560 if (notify_socket
< 0) {
565 ret
= lttng_create_all_event_enums(desc
->nr_fields
, desc
->fields
,
568 DBG("Error (%d) adding enum to session", ret
);
569 goto create_enum_error
;
573 * Check if loglevel match. Refuse to connect event if not.
575 event
= zmalloc(sizeof(struct lttng_event
));
582 /* Event will be enabled by enabler sync. */
584 event
->registered
= 0;
585 CDS_INIT_LIST_HEAD(&event
->bytecode_runtime_head
);
586 CDS_INIT_LIST_HEAD(&event
->enablers_ref_head
);
590 loglevel
= *(*event
->desc
->loglevel
);
592 loglevel
= TRACE_DEFAULT
;
593 if (desc
->u
.ext
.model_emf_uri
)
594 uri
= *(desc
->u
.ext
.model_emf_uri
);
598 /* Fetch event ID from sessiond */
599 ret
= ustcomm_register_event(notify_socket
,
611 DBG("Error (%d) registering event to sessiond", ret
);
612 goto sessiond_register_error
;
615 /* Populate lttng_event structure before tracepoint registration. */
617 cds_list_add(&event
->node
, &chan
->session
->events_head
);
618 cds_hlist_add_head(&event
->hlist
, head
);
621 sessiond_register_error
:
631 int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc
*desc
,
632 struct lttng_enabler
*enabler
)
635 unsigned int has_loglevel
= 0;
637 assert(enabler
->type
== LTTNG_ENABLER_STAR_GLOB
);
638 if (!strutils_star_glob_match(enabler
->event_param
.name
, -1ULL,
641 if (desc
->loglevel
) {
642 loglevel
= *(*desc
->loglevel
);
645 if (!lttng_loglevel_match(loglevel
,
647 enabler
->event_param
.loglevel_type
,
648 enabler
->event_param
.loglevel
))
654 int lttng_desc_match_event_enabler(const struct lttng_event_desc
*desc
,
655 struct lttng_enabler
*enabler
)
658 unsigned int has_loglevel
= 0;
660 assert(enabler
->type
== LTTNG_ENABLER_EVENT
);
661 if (strcmp(desc
->name
, enabler
->event_param
.name
))
663 if (desc
->loglevel
) {
664 loglevel
= *(*desc
->loglevel
);
667 if (!lttng_loglevel_match(loglevel
,
669 enabler
->event_param
.loglevel_type
,
670 enabler
->event_param
.loglevel
))
676 int lttng_desc_match_enabler(const struct lttng_event_desc
*desc
,
677 struct lttng_enabler
*enabler
)
679 switch (enabler
->type
) {
680 case LTTNG_ENABLER_STAR_GLOB
:
682 struct lttng_ust_excluder_node
*excluder
;
684 if (!lttng_desc_match_star_glob_enabler(desc
, enabler
)) {
689 * If the matching event matches with an excluder,
690 * return 'does not match'
692 cds_list_for_each_entry(excluder
, &enabler
->excluder_head
, node
) {
695 for (count
= 0; count
< excluder
->excluder
.count
; count
++) {
699 excluder_name
= (char *) (excluder
->excluder
.names
)
700 + count
* LTTNG_UST_SYM_NAME_LEN
;
701 len
= strnlen(excluder_name
, LTTNG_UST_SYM_NAME_LEN
);
702 if (len
> 0 && strutils_star_glob_match(excluder_name
, len
, desc
->name
, -1ULL))
708 case LTTNG_ENABLER_EVENT
:
709 return lttng_desc_match_event_enabler(desc
, enabler
);
716 int lttng_event_match_enabler(struct lttng_event
*event
,
717 struct lttng_enabler
*enabler
)
719 if (lttng_desc_match_enabler(event
->desc
, enabler
)
720 && event
->chan
== enabler
->chan
)
727 struct lttng_enabler_ref
* lttng_event_enabler_ref(struct lttng_event
*event
,
728 struct lttng_enabler
*enabler
)
730 struct lttng_enabler_ref
*enabler_ref
;
732 cds_list_for_each_entry(enabler_ref
,
733 &event
->enablers_ref_head
, node
) {
734 if (enabler_ref
->ref
== enabler
)
741 * Create struct lttng_event if it is missing and present in the list of
745 void lttng_create_event_if_missing(struct lttng_enabler
*enabler
)
747 struct lttng_session
*session
= enabler
->chan
->session
;
748 struct lttng_probe_desc
*probe_desc
;
749 const struct lttng_event_desc
*desc
;
750 struct lttng_event
*event
;
752 struct cds_list_head
*probe_list
;
754 probe_list
= lttng_get_probe_list_head();
756 * For each probe event, if we find that a probe event matches
757 * our enabler, create an associated lttng_event if not
760 cds_list_for_each_entry(probe_desc
, probe_list
, head
) {
761 for (i
= 0; i
< probe_desc
->nr_events
; i
++) {
763 struct cds_hlist_head
*head
;
764 struct cds_hlist_node
*node
;
765 const char *event_name
;
769 desc
= probe_desc
->event_desc
[i
];
770 if (!lttng_desc_match_enabler(desc
, enabler
))
772 event_name
= desc
->name
;
773 name_len
= strlen(event_name
);
776 * Check if already created.
778 hash
= jhash(event_name
, name_len
, 0);
779 head
= &session
->events_ht
.table
[hash
& (LTTNG_UST_EVENT_HT_SIZE
- 1)];
780 cds_hlist_for_each_entry(event
, node
, head
, hlist
) {
781 if (event
->desc
== desc
782 && event
->chan
== enabler
->chan
)
789 * We need to create an event for this
792 ret
= lttng_event_create(probe_desc
->event_desc
[i
],
795 DBG("Unable to create event %s, error %d\n",
796 probe_desc
->event_desc
[i
]->name
, ret
);
803 * Create events associated with an enabler (if not already present),
804 * and add backward reference from the event to the enabler.
807 int lttng_enabler_ref_events(struct lttng_enabler
*enabler
)
809 struct lttng_session
*session
= enabler
->chan
->session
;
810 struct lttng_event
*event
;
812 /* First ensure that probe events are created for this enabler. */
813 lttng_create_event_if_missing(enabler
);
815 /* For each event matching enabler in session event list. */
816 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
817 struct lttng_enabler_ref
*enabler_ref
;
819 if (!lttng_event_match_enabler(event
, enabler
))
822 enabler_ref
= lttng_event_enabler_ref(event
, enabler
);
825 * If no backward ref, create it.
826 * Add backward ref from event to enabler.
828 enabler_ref
= zmalloc(sizeof(*enabler_ref
));
831 enabler_ref
->ref
= enabler
;
832 cds_list_add(&enabler_ref
->node
,
833 &event
->enablers_ref_head
);
837 * Link filter bytecodes if not linked yet.
839 lttng_enabler_event_link_bytecode(event
, enabler
);
841 /* TODO: merge event context. */
847 * Called at library load: connect the probe on all enablers matching
849 * Called with session mutex held.
851 int lttng_fix_pending_events(void)
853 struct lttng_session
*session
;
855 cds_list_for_each_entry(session
, &sessions
, node
) {
856 lttng_session_lazy_sync_enablers(session
);
862 * For each session of the owner thread, execute pending statedump.
863 * Only dump state for the sessions owned by the caller thread, because
864 * we don't keep ust_lock across the entire iteration.
866 void lttng_handle_pending_statedump(void *owner
)
868 struct lttng_session
*session
;
870 /* Execute state dump */
871 do_lttng_ust_statedump(owner
);
873 /* Clear pending state dump */
877 cds_list_for_each_entry(session
, &sessions
, node
) {
878 if (session
->owner
!= owner
)
880 if (!session
->statedump_pending
)
882 session
->statedump_pending
= 0;
890 * Only used internally at session destruction.
893 void _lttng_event_destroy(struct lttng_event
*event
)
895 struct lttng_enabler_ref
*enabler_ref
, *tmp_enabler_ref
;
897 cds_list_del(&event
->node
);
898 lttng_destroy_context(event
->ctx
);
899 lttng_free_event_filter_runtime(event
);
900 /* Free event enabler refs */
901 cds_list_for_each_entry_safe(enabler_ref
, tmp_enabler_ref
,
902 &event
->enablers_ref_head
, node
)
908 void _lttng_enum_destroy(struct lttng_enum
*_enum
)
910 cds_list_del(&_enum
->node
);
914 void lttng_ust_events_exit(void)
916 struct lttng_session
*session
, *tmpsession
;
918 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, node
)
919 lttng_session_destroy(session
);
923 * Enabler management.
925 struct lttng_enabler
*lttng_enabler_create(enum lttng_enabler_type type
,
926 struct lttng_ust_event
*event_param
,
927 struct lttng_channel
*chan
)
929 struct lttng_enabler
*enabler
;
931 enabler
= zmalloc(sizeof(*enabler
));
934 enabler
->type
= type
;
935 CDS_INIT_LIST_HEAD(&enabler
->filter_bytecode_head
);
936 CDS_INIT_LIST_HEAD(&enabler
->excluder_head
);
937 memcpy(&enabler
->event_param
, event_param
,
938 sizeof(enabler
->event_param
));
939 enabler
->chan
= chan
;
941 enabler
->enabled
= 0;
942 cds_list_add(&enabler
->node
, &enabler
->chan
->session
->enablers_head
);
943 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
947 int lttng_enabler_enable(struct lttng_enabler
*enabler
)
949 enabler
->enabled
= 1;
950 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
954 int lttng_enabler_disable(struct lttng_enabler
*enabler
)
956 enabler
->enabled
= 0;
957 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
961 int lttng_enabler_attach_bytecode(struct lttng_enabler
*enabler
,
962 struct lttng_ust_filter_bytecode_node
*bytecode
)
964 bytecode
->enabler
= enabler
;
965 cds_list_add_tail(&bytecode
->node
, &enabler
->filter_bytecode_head
);
966 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
970 int lttng_enabler_attach_exclusion(struct lttng_enabler
*enabler
,
971 struct lttng_ust_excluder_node
*excluder
)
973 excluder
->enabler
= enabler
;
974 cds_list_add_tail(&excluder
->node
, &enabler
->excluder_head
);
975 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
979 int lttng_attach_context(struct lttng_ust_context
*context_param
,
980 union ust_args
*uargs
,
981 struct lttng_ctx
**ctx
, struct lttng_session
*session
)
984 * We cannot attach a context after trace has been started for a
985 * session because the metadata does not allow expressing this
986 * information outside of the original channel scope.
988 if (session
->been_active
)
991 switch (context_param
->ctx
) {
992 case LTTNG_UST_CONTEXT_PTHREAD_ID
:
993 return lttng_add_pthread_id_to_ctx(ctx
);
994 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
996 struct lttng_ust_perf_counter_ctx
*perf_ctx_param
;
998 perf_ctx_param
= &context_param
->u
.perf_counter
;
999 return lttng_add_perf_counter_to_ctx(
1000 perf_ctx_param
->type
,
1001 perf_ctx_param
->config
,
1002 perf_ctx_param
->name
,
1005 case LTTNG_UST_CONTEXT_VTID
:
1006 return lttng_add_vtid_to_ctx(ctx
);
1007 case LTTNG_UST_CONTEXT_VPID
:
1008 return lttng_add_vpid_to_ctx(ctx
);
1009 case LTTNG_UST_CONTEXT_PROCNAME
:
1010 return lttng_add_procname_to_ctx(ctx
);
1011 case LTTNG_UST_CONTEXT_IP
:
1012 return lttng_add_ip_to_ctx(ctx
);
1013 case LTTNG_UST_CONTEXT_CPU_ID
:
1014 return lttng_add_cpu_id_to_ctx(ctx
);
1015 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
1016 return lttng_ust_add_app_context_to_ctx_rcu(uargs
->app_context
.ctxname
,
1023 int lttng_enabler_attach_context(struct lttng_enabler
*enabler
,
1024 struct lttng_ust_context
*context_param
)
1026 #if 0 // disabled for now.
1027 struct lttng_session
*session
= enabler
->chan
->session
;
1030 ret
= lttng_attach_context(context_param
, &enabler
->ctx
,
1034 lttng_session_lazy_sync_enablers(enabler
->chan
->session
);
1040 void lttng_enabler_destroy(struct lttng_enabler
*enabler
)
1042 struct lttng_ust_filter_bytecode_node
*filter_node
, *tmp_filter_node
;
1043 struct lttng_ust_excluder_node
*excluder_node
, *tmp_excluder_node
;
1045 /* Destroy filter bytecode */
1046 cds_list_for_each_entry_safe(filter_node
, tmp_filter_node
,
1047 &enabler
->filter_bytecode_head
, node
) {
1051 /* Destroy excluders */
1052 cds_list_for_each_entry_safe(excluder_node
, tmp_excluder_node
,
1053 &enabler
->excluder_head
, node
) {
1054 free(excluder_node
);
1057 /* Destroy contexts */
1058 lttng_destroy_context(enabler
->ctx
);
1060 cds_list_del(&enabler
->node
);
1065 * lttng_session_sync_enablers should be called just before starting a
1069 void lttng_session_sync_enablers(struct lttng_session
*session
)
1071 struct lttng_enabler
*enabler
;
1072 struct lttng_event
*event
;
1074 cds_list_for_each_entry(enabler
, &session
->enablers_head
, node
)
1075 lttng_enabler_ref_events(enabler
);
1077 * For each event, if at least one of its enablers is enabled,
1078 * and its channel and session transient states are enabled, we
1079 * enable the event, else we disable it.
1081 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1082 struct lttng_enabler_ref
*enabler_ref
;
1083 struct lttng_bytecode_runtime
*runtime
;
1084 int enabled
= 0, has_enablers_without_bytecode
= 0;
1087 cds_list_for_each_entry(enabler_ref
,
1088 &event
->enablers_ref_head
, node
) {
1089 if (enabler_ref
->ref
->enabled
) {
1095 * Enabled state is based on union of enablers, with
1096 * intesection of session and channel transient enable
1099 enabled
= enabled
&& session
->tstate
&& event
->chan
->tstate
;
1101 CMM_STORE_SHARED(event
->enabled
, enabled
);
1103 * Sync tracepoint registration with event enabled
1107 if (!event
->registered
)
1108 register_event(event
);
1110 if (event
->registered
)
1111 unregister_event(event
);
1114 /* Check if has enablers without bytecode enabled */
1115 cds_list_for_each_entry(enabler_ref
,
1116 &event
->enablers_ref_head
, node
) {
1117 if (enabler_ref
->ref
->enabled
1118 && cds_list_empty(&enabler_ref
->ref
->filter_bytecode_head
)) {
1119 has_enablers_without_bytecode
= 1;
1123 event
->has_enablers_without_bytecode
=
1124 has_enablers_without_bytecode
;
1126 /* Enable filters */
1127 cds_list_for_each_entry(runtime
,
1128 &event
->bytecode_runtime_head
, node
) {
1129 lttng_filter_sync_state(runtime
);
1132 __tracepoint_probe_prune_release_queue();
1136 * Apply enablers to session events, adding events to session if need
1137 * be. It is required after each modification applied to an active
1138 * session, and right before session "start".
1139 * "lazy" sync means we only sync if required.
1142 void lttng_session_lazy_sync_enablers(struct lttng_session
*session
)
1144 /* We can skip if session is not active */
1145 if (!session
->active
)
1147 lttng_session_sync_enablers(session
);
1151 * Update all sessions with the given app context.
1152 * Called with ust lock held.
1153 * This is invoked when an application context gets loaded/unloaded. It
1154 * ensures the context callbacks are in sync with the application
1155 * context (either app context callbacks, or dummy callbacks).
1157 void lttng_ust_context_set_session_provider(const char *name
,
1158 size_t (*get_size
)(struct lttng_ctx_field
*field
, size_t offset
),
1159 void (*record
)(struct lttng_ctx_field
*field
,
1160 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
1161 struct lttng_channel
*chan
),
1162 void (*get_value
)(struct lttng_ctx_field
*field
,
1163 struct lttng_ctx_value
*value
))
1165 struct lttng_session
*session
;
1167 cds_list_for_each_entry(session
, &sessions
, node
) {
1168 struct lttng_channel
*chan
;
1169 struct lttng_event
*event
;
1172 ret
= lttng_ust_context_set_provider_rcu(&session
->ctx
,
1173 name
, get_size
, record
, get_value
);
1176 cds_list_for_each_entry(chan
, &session
->chan_head
, node
) {
1177 ret
= lttng_ust_context_set_provider_rcu(&chan
->ctx
,
1178 name
, get_size
, record
, get_value
);
1182 cds_list_for_each_entry(event
, &session
->events_head
, node
) {
1183 ret
= lttng_ust_context_set_provider_rcu(&event
->ctx
,
1184 name
, get_size
, record
, get_value
);