4 * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * Holds LTTng per-session event registry.
8 * Dual LGPL v2.1/GPL v2 license.
14 #include <urcu/list.h>
15 #include <urcu/hlist.h>
18 #include <urcu/compiler.h>
19 #include <urcu/uatomic.h>
20 #include <uuid/uuid.h>
21 #include <ust/tracepoint.h>
25 #include <ust/lttng-events.h>
26 #include <ust/usterr-signal-safe.h>
28 #include "ltt-tracer.h"
29 #include "ltt-tracer-core.h"
31 #include "../libringbuffer/shm.h"
34 #include <ust/kcompat/jhash.h>
37 * The sessions mutex is the centralized mutex across UST tracing
38 * control and probe registration. All operations within this file are
39 * called by the communication thread, under ust_lock protection.
41 static DEFINE_MUTEX(sessions_mutex
);
45 pthread_mutex_lock(&sessions_mutex
);
50 pthread_mutex_unlock(&sessions_mutex
);
53 static CDS_LIST_HEAD(sessions
);
54 static CDS_LIST_HEAD(ltt_transport_list
);
57 * Pending probes hash table, containing the registered ltt events for
58 * which tracepoint probes are still missing. Protected by the sessions
61 #define PENDING_PROBE_HASH_BITS 6
62 #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS)
63 static struct cds_hlist_head pending_probe_table
[PENDING_PROBE_HASH_SIZE
];
65 struct ust_pending_probe
{
66 struct ltt_event
*event
;
67 struct cds_hlist_node node
;
71 static void _ltt_event_destroy(struct ltt_event
*event
);
72 static void _ltt_channel_destroy(struct ltt_channel
*chan
);
73 static int _ltt_event_unregister(struct ltt_event
*event
);
75 int _ltt_event_metadata_statedump(struct ltt_session
*session
,
76 struct ltt_channel
*chan
,
77 struct ltt_event
*event
);
79 int _ltt_session_metadata_statedump(struct ltt_session
*session
);
82 * called at event creation if probe is missing.
83 * called with session mutex held.
86 int add_pending_probe(struct ltt_event
*event
, const char *name
)
88 struct cds_hlist_head
*head
;
89 struct ust_pending_probe
*e
;
90 size_t name_len
= strlen(name
) + 1;
91 u32 hash
= jhash(name
, name_len
- 1, 0);
93 head
= &pending_probe_table
[hash
& (PENDING_PROBE_HASH_SIZE
- 1)];
94 e
= zmalloc(sizeof(struct ust_pending_probe
) + name_len
);
97 memcpy(&e
->name
[0], name
, name_len
);
98 cds_hlist_add_head(&e
->node
, head
);
100 event
->pending_probe
= e
;
105 * remove a pending probe. called when at event teardown and when an
106 * event is fixed (probe is loaded).
107 * called with session mutex held.
110 void remove_pending_probe(struct ust_pending_probe
*e
)
114 cds_hlist_del(&e
->node
);
119 * Called at library load: connect the probe on the events pending on
121 * called with session mutex held.
123 int pending_probe_fix_events(const struct lttng_event_desc
*desc
)
125 struct cds_hlist_head
*head
;
126 struct cds_hlist_node
*node
, *p
;
127 struct ust_pending_probe
*e
;
128 const char *name
= desc
->name
;
129 size_t name_len
= strlen(name
) + 1;
130 u32 hash
= jhash(name
, name_len
- 1, 0);
133 head
= &pending_probe_table
[hash
& (PENDING_PROBE_HASH_SIZE
- 1)];
134 cds_hlist_for_each_entry_safe(e
, node
, p
, head
, node
) {
135 struct ltt_event
*event
;
136 struct ltt_channel
*chan
;
138 if (strcmp(name
, e
->name
))
142 assert(!event
->desc
);
144 event
->pending_probe
= NULL
;
145 remove_pending_probe(e
);
146 ret
|= __tracepoint_probe_register(name
,
147 event
->desc
->probe_callback
,
151 event
->id
= chan
->free_event_id
++;
152 ret
|= _ltt_event_metadata_statedump(chan
->session
, chan
,
158 void synchronize_trace(void)
163 struct ltt_session
*ltt_session_create(void)
165 struct ltt_session
*session
;
167 session
= zmalloc(sizeof(struct ltt_session
));
170 CDS_INIT_LIST_HEAD(&session
->chan
);
171 CDS_INIT_LIST_HEAD(&session
->events
);
172 uuid_generate(session
->uuid
);
173 cds_list_add(&session
->list
, &sessions
);
177 void ltt_session_destroy(struct ltt_session
*session
)
179 struct ltt_channel
*chan
, *tmpchan
;
180 struct ltt_event
*event
, *tmpevent
;
183 CMM_ACCESS_ONCE(session
->active
) = 0;
184 cds_list_for_each_entry(event
, &session
->events
, list
) {
185 ret
= _ltt_event_unregister(event
);
188 synchronize_trace(); /* Wait for in-flight events to complete */
189 cds_list_for_each_entry_safe(event
, tmpevent
, &session
->events
, list
)
190 _ltt_event_destroy(event
);
191 cds_list_for_each_entry_safe(chan
, tmpchan
, &session
->chan
, list
)
192 _ltt_channel_destroy(chan
);
193 cds_list_del(&session
->list
);
197 int ltt_session_enable(struct ltt_session
*session
)
200 struct ltt_channel
*chan
;
202 if (session
->active
) {
208 * Snapshot the number of events per channel to know the type of header
211 cds_list_for_each_entry(chan
, &session
->chan
, list
) {
212 if (chan
->header_type
)
213 continue; /* don't change it if session stop/restart */
214 if (chan
->free_event_id
< 31)
215 chan
->header_type
= 1; /* compact */
217 chan
->header_type
= 2; /* large */
220 CMM_ACCESS_ONCE(session
->active
) = 1;
221 CMM_ACCESS_ONCE(session
->been_active
) = 1;
222 ret
= _ltt_session_metadata_statedump(session
);
224 CMM_ACCESS_ONCE(session
->active
) = 0;
229 int ltt_session_disable(struct ltt_session
*session
)
233 if (!session
->active
) {
237 CMM_ACCESS_ONCE(session
->active
) = 0;
242 int ltt_channel_enable(struct ltt_channel
*channel
)
246 if (channel
== channel
->session
->metadata
)
248 old
= uatomic_xchg(&channel
->enabled
, 1);
254 int ltt_channel_disable(struct ltt_channel
*channel
)
258 if (channel
== channel
->session
->metadata
)
260 old
= uatomic_xchg(&channel
->enabled
, 0);
266 int ltt_event_enable(struct ltt_event
*event
)
270 if (event
->chan
== event
->chan
->session
->metadata
)
272 old
= uatomic_xchg(&event
->enabled
, 1);
278 int ltt_event_disable(struct ltt_event
*event
)
282 if (event
->chan
== event
->chan
->session
->metadata
)
284 old
= uatomic_xchg(&event
->enabled
, 0);
290 static struct ltt_transport
*ltt_transport_find(const char *name
)
292 struct ltt_transport
*transport
;
294 cds_list_for_each_entry(transport
, <t_transport_list
, node
) {
295 if (!strcmp(transport
->name
, name
))
301 struct ltt_channel
*ltt_channel_create(struct ltt_session
*session
,
302 const char *transport_name
,
304 size_t subbuf_size
, size_t num_subbuf
,
305 unsigned int switch_timer_interval
,
306 unsigned int read_timer_interval
,
307 int *shm_fd
, int *wait_fd
,
308 uint64_t *memory_map_size
)
310 struct ltt_channel
*chan
;
311 struct ltt_transport
*transport
;
313 if (session
->been_active
)
314 goto active
; /* Refuse to add channel to active session */
315 transport
= ltt_transport_find(transport_name
);
317 DBG("LTTng transport %s not found\n",
321 chan
= zmalloc(sizeof(struct ltt_channel
));
324 chan
->session
= session
;
325 chan
->id
= session
->free_chan_id
++;
327 * Note: the channel creation op already writes into the packet
328 * headers. Therefore the "chan" information used as input
329 * should be already accessible.
331 transport
->ops
.channel_create("[lttng]", chan
, buf_addr
,
332 subbuf_size
, num_subbuf
, switch_timer_interval
,
333 read_timer_interval
, shm_fd
, wait_fd
,
338 chan
->ops
= &transport
->ops
;
339 cds_list_add(&chan
->list
, &session
->chan
);
351 * Only used internally at session destruction.
354 void _ltt_channel_destroy(struct ltt_channel
*chan
)
356 chan
->ops
->channel_destroy(chan
);
357 cds_list_del(&chan
->list
);
358 lttng_destroy_context(chan
->ctx
);
363 * Supports event creation while tracing session is active.
365 struct ltt_event
*ltt_event_create(struct ltt_channel
*chan
,
366 struct lttng_ust_event
*event_param
,
369 struct ltt_event
*event
;
372 if (chan
->used_event_id
== -1UL)
375 * This is O(n^2) (for each event, the loop is called at event
376 * creation). Might require a hash if we have lots of events.
378 cds_list_for_each_entry(event
, &chan
->session
->events
, list
)
379 if (event
->desc
&& !strcmp(event
->desc
->name
, event_param
->name
))
381 event
= zmalloc(sizeof(struct ltt_event
));
385 event
->filter
= filter
;
387 * used_event_id counts the maximum number of event IDs that can
388 * register if all probes register.
390 chan
->used_event_id
++;
392 event
->instrumentation
= event_param
->instrumentation
;
393 /* Populate ltt_event structure before tracepoint registration. */
395 switch (event_param
->instrumentation
) {
396 case LTTNG_UST_TRACEPOINT
:
397 event
->desc
= ltt_event_get(event_param
->name
);
399 ret
= __tracepoint_probe_register(event_param
->name
,
400 event
->desc
->probe_callback
,
404 event
->id
= chan
->free_event_id
++;
407 * If the probe is not present, event->desc stays NULL,
408 * waiting for the probe to register, and the event->id
411 ret
= add_pending_probe(event
, event_param
->name
);
413 goto add_pending_error
;
420 ret
= _ltt_event_metadata_statedump(chan
->session
, chan
, event
);
422 goto statedump_error
;
424 cds_list_add(&event
->list
, &chan
->session
->events
);
429 WARN_ON_ONCE(__tracepoint_probe_unregister(event_param
->name
,
430 event
->desc
->probe_callback
,
432 ltt_event_put(event
->desc
);
444 * Only used internally at session destruction.
446 int _ltt_event_unregister(struct ltt_event
*event
)
450 switch (event
->instrumentation
) {
451 case LTTNG_UST_TRACEPOINT
:
453 ret
= __tracepoint_probe_unregister(event
->desc
->name
,
454 event
->desc
->probe_callback
,
459 remove_pending_probe(event
->pending_probe
);
470 * Only used internally at session destruction.
473 void _ltt_event_destroy(struct ltt_event
*event
)
475 switch (event
->instrumentation
) {
476 case LTTNG_UST_TRACEPOINT
:
478 ltt_event_put(event
->desc
);
484 cds_list_del(&event
->list
);
485 lttng_destroy_context(event
->ctx
);
490 * We have exclusive access to our metadata buffer (protected by the
491 * ust_lock), so we can do racy operations such as looking for
492 * remaining space left in packet and write, since mutual exclusion
493 * protects us from concurrent writes.
495 int lttng_metadata_printf(struct ltt_session
*session
,
496 const char *fmt
, ...)
498 struct lttng_ust_lib_ring_buffer_ctx ctx
;
499 struct ltt_channel
*chan
= session
->metadata
;
501 int ret
= 0, waitret
;
502 size_t len
, reserve_len
, pos
;
505 WARN_ON_ONCE(!CMM_ACCESS_ONCE(session
->active
));
508 ret
= vasprintf(&str
, fmt
, ap
);
516 for (pos
= 0; pos
< len
; pos
+= reserve_len
) {
517 reserve_len
= min_t(size_t,
518 chan
->ops
->packet_avail_size(chan
->chan
, chan
->handle
),
520 lib_ring_buffer_ctx_init(&ctx
, chan
->chan
, NULL
, reserve_len
,
521 sizeof(char), -1, chan
->handle
);
523 * We don't care about metadata buffer's records lost
524 * count, because we always retry here. Report error if
525 * we need to bail out after timeout or being
528 waitret
= wait_cond_interruptible_timeout(
530 ret
= chan
->ops
->event_reserve(&ctx
, 0);
531 ret
!= -ENOBUFS
|| !ret
;
533 LTTNG_METADATA_TIMEOUT_MSEC
);
534 if (waitret
== -ETIMEDOUT
|| waitret
== -EINTR
|| ret
) {
535 DBG("LTTng: Failure to write metadata to buffers (%s)\n",
536 waitret
== -EINTR
? "interrupted" :
537 (ret
== -ENOBUFS
? "timeout" : "I/O error"));
538 if (waitret
== -EINTR
)
542 chan
->ops
->event_write(&ctx
, &str
[pos
], reserve_len
);
543 chan
->ops
->event_commit(&ctx
);
551 int _ltt_field_statedump(struct ltt_session
*session
,
552 const struct lttng_event_field
*field
)
556 switch (field
->type
.atype
) {
558 ret
= lttng_metadata_printf(session
,
559 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
560 field
->type
.u
.basic
.integer
.size
,
561 field
->type
.u
.basic
.integer
.alignment
,
562 field
->type
.u
.basic
.integer
.signedness
,
563 (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_none
)
565 : (field
->type
.u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
568 field
->type
.u
.basic
.integer
.base
,
569 #if (BYTE_ORDER == BIG_ENDIAN)
570 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
572 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
577 ret
= lttng_metadata_printf(session
,
578 " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n",
579 field
->type
.u
.basic
._float
.exp_dig
,
580 field
->type
.u
.basic
._float
.mant_dig
,
581 field
->type
.u
.basic
._float
.alignment
,
582 #if (BYTE_ORDER == BIG_ENDIAN)
583 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
585 field
->type
.u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
590 ret
= lttng_metadata_printf(session
,
592 field
->type
.u
.basic
.enumeration
.name
,
597 const struct lttng_basic_type
*elem_type
;
599 elem_type
= &field
->type
.u
.array
.elem_type
;
600 ret
= lttng_metadata_printf(session
,
601 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
602 elem_type
->u
.basic
.integer
.size
,
603 elem_type
->u
.basic
.integer
.alignment
,
604 elem_type
->u
.basic
.integer
.signedness
,
605 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
607 : (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
610 elem_type
->u
.basic
.integer
.base
,
611 #if (BYTE_ORDER == BIG_ENDIAN)
612 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
614 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
616 field
->name
, field
->type
.u
.array
.length
);
621 const struct lttng_basic_type
*elem_type
;
622 const struct lttng_basic_type
*length_type
;
624 elem_type
= &field
->type
.u
.sequence
.elem_type
;
625 length_type
= &field
->type
.u
.sequence
.length_type
;
626 ret
= lttng_metadata_printf(session
,
627 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
628 length_type
->u
.basic
.integer
.size
,
629 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
630 length_type
->u
.basic
.integer
.signedness
,
631 (length_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
633 : ((length_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
636 length_type
->u
.basic
.integer
.base
,
637 #if (BYTE_ORDER == BIG_ENDIAN)
638 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
640 length_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
646 ret
= lttng_metadata_printf(session
,
647 " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
648 elem_type
->u
.basic
.integer
.size
,
649 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
650 elem_type
->u
.basic
.integer
.signedness
,
651 (elem_type
->u
.basic
.integer
.encoding
== lttng_encode_none
)
653 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_encode_UTF8
)
656 elem_type
->u
.basic
.integer
.base
,
657 #if (BYTE_ORDER == BIG_ENDIAN)
658 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = le;" : "",
660 elem_type
->u
.basic
.integer
.reverse_byte_order
? " byte_order = be;" : "",
668 /* Default encoding is UTF8 */
669 ret
= lttng_metadata_printf(session
,
671 field
->type
.u
.basic
.string
.encoding
== lttng_encode_ASCII
?
672 " { encoding = ASCII; }" : "",
683 int _ltt_context_metadata_statedump(struct ltt_session
*session
,
684 struct lttng_ctx
*ctx
)
691 for (i
= 0; i
< ctx
->nr_fields
; i
++) {
692 const struct lttng_ctx_field
*field
= &ctx
->fields
[i
];
694 ret
= _ltt_field_statedump(session
, &field
->event_field
);
702 int _ltt_fields_metadata_statedump(struct ltt_session
*session
,
703 struct ltt_event
*event
)
705 const struct lttng_event_desc
*desc
= event
->desc
;
709 for (i
= 0; i
< desc
->nr_fields
; i
++) {
710 const struct lttng_event_field
*field
= &desc
->fields
[i
];
712 ret
= _ltt_field_statedump(session
, field
);
720 int _ltt_event_metadata_statedump(struct ltt_session
*session
,
721 struct ltt_channel
*chan
,
722 struct ltt_event
*event
)
726 if (event
->metadata_dumped
|| !CMM_ACCESS_ONCE(session
->active
))
728 if (chan
== session
->metadata
)
731 * Don't print events for which probe load is pending.
736 ret
= lttng_metadata_printf(session
,
740 " stream_id = %u;\n",
748 ret
= lttng_metadata_printf(session
,
749 " context := struct {\n");
753 ret
= _ltt_context_metadata_statedump(session
, event
->ctx
);
757 ret
= lttng_metadata_printf(session
,
763 ret
= lttng_metadata_printf(session
,
764 " fields := struct {\n"
769 ret
= _ltt_fields_metadata_statedump(session
, event
);
774 * LTTng space reservation can only reserve multiples of the
777 ret
= lttng_metadata_printf(session
,
783 event
->metadata_dumped
= 1;
790 int _ltt_channel_metadata_statedump(struct ltt_session
*session
,
791 struct ltt_channel
*chan
)
795 if (chan
->metadata_dumped
|| !CMM_ACCESS_ONCE(session
->active
))
797 if (chan
== session
->metadata
)
800 WARN_ON_ONCE(!chan
->header_type
);
801 ret
= lttng_metadata_printf(session
,
804 " event.header := %s;\n"
805 " packet.context := struct packet_context;\n",
807 chan
->header_type
== 1 ? "struct event_header_compact" :
808 "struct event_header_large");
813 ret
= lttng_metadata_printf(session
,
814 " event.context := struct {\n");
818 ret
= _ltt_context_metadata_statedump(session
, chan
->ctx
);
822 ret
= lttng_metadata_printf(session
,
828 ret
= lttng_metadata_printf(session
,
831 chan
->metadata_dumped
= 1;
837 int _ltt_stream_packet_context_declare(struct ltt_session
*session
)
839 return lttng_metadata_printf(session
,
840 "struct packet_context {\n"
841 " uint64_t timestamp_begin;\n"
842 " uint64_t timestamp_end;\n"
843 " uint32_t events_discarded;\n"
844 " uint32_t content_size;\n"
845 " uint32_t packet_size;\n"
846 " uint32_t cpu_id;\n"
854 * id 31 is reserved to indicate an extended header.
857 * id: range: 0 - 65534.
858 * id 65535 is reserved to indicate an extended header.
861 int _ltt_event_header_declare(struct ltt_session
*session
)
863 return lttng_metadata_printf(session
,
864 "struct event_header_compact {\n"
865 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
868 " uint27_t timestamp;\n"
872 " uint64_t timestamp;\n"
877 "struct event_header_large {\n"
878 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
881 " uint32_t timestamp;\n"
885 " uint64_t timestamp;\n"
889 lttng_alignof(uint32_t) * CHAR_BIT
,
890 lttng_alignof(uint16_t) * CHAR_BIT
895 * Output metadata into this session's metadata buffers.
898 int _ltt_session_metadata_statedump(struct ltt_session
*session
)
900 unsigned char *uuid_c
= session
->uuid
;
902 struct ltt_channel
*chan
;
903 struct ltt_event
*event
;
906 if (!CMM_ACCESS_ONCE(session
->active
))
908 if (session
->metadata_dumped
)
910 if (!session
->metadata
) {
911 DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n");
915 snprintf(uuid_s
, sizeof(uuid_s
),
916 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
917 uuid_c
[0], uuid_c
[1], uuid_c
[2], uuid_c
[3],
918 uuid_c
[4], uuid_c
[5], uuid_c
[6], uuid_c
[7],
919 uuid_c
[8], uuid_c
[9], uuid_c
[10], uuid_c
[11],
920 uuid_c
[12], uuid_c
[13], uuid_c
[14], uuid_c
[15]);
922 ret
= lttng_metadata_printf(session
,
923 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
924 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
925 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
926 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
927 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
928 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
934 " byte_order = %s;\n"
935 " packet.header := struct {\n"
937 " uint8_t uuid[16];\n"
938 " uint32_t stream_id;\n"
941 lttng_alignof(uint8_t) * CHAR_BIT
,
942 lttng_alignof(uint16_t) * CHAR_BIT
,
943 lttng_alignof(uint32_t) * CHAR_BIT
,
944 lttng_alignof(uint64_t) * CHAR_BIT
,
948 #if (BYTE_ORDER == BIG_ENDIAN)
957 ret
= _ltt_stream_packet_context_declare(session
);
961 ret
= _ltt_event_header_declare(session
);
966 cds_list_for_each_entry(chan
, &session
->chan
, list
) {
967 ret
= _ltt_channel_metadata_statedump(session
, chan
);
972 cds_list_for_each_entry(event
, &session
->events
, list
) {
973 ret
= _ltt_event_metadata_statedump(session
, event
->chan
, event
);
977 session
->metadata_dumped
= 1;
983 * ltt_transport_register - LTT transport registration
984 * @transport: transport structure
986 * Registers a transport which can be used as output to extract the data out of
987 * LTTng. Called with ust_lock held.
989 void ltt_transport_register(struct ltt_transport
*transport
)
991 cds_list_add_tail(&transport
->node
, <t_transport_list
);
995 * ltt_transport_unregister - LTT transport unregistration
996 * @transport: transport structure
997 * Called with ust_lock held.
999 void ltt_transport_unregister(struct ltt_transport
*transport
)
1001 cds_list_del(&transport
->node
);
1004 void ltt_events_exit(void)
1006 struct ltt_session
*session
, *tmpsession
;
1008 cds_list_for_each_entry_safe(session
, tmpsession
, &sessions
, list
)
1009 ltt_session_destroy(session
);