2 * lttng-ring-buffer-client.h
4 * LTTng lib ring buffer client template.
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
24 #include <lttng/ust-events.h>
25 #include "lttng/bitfield.h"
27 #include "lttng-tracer.h"
28 #include "../libringbuffer/frontend_types.h"
30 #define LTTNG_COMPACT_EVENT_BITS 5
31 #define LTTNG_COMPACT_TSC_BITS 27
34 * Keep the natural field alignment for _each field_ within this structure if
35 * you ever add/remove a field from this header. Packed attribute is not used
36 * because gcc generates poor code on at least powerpc and mips. Don't ever
37 * let gcc add padding between the structure elements.
40 struct packet_header
{
41 /* Trace packet header */
44 * contains endianness information.
46 uint8_t uuid
[LTTNG_UST_UUID_LEN
];
50 /* Stream packet context */
51 uint64_t timestamp_begin
; /* Cycle count at subbuffer start */
52 uint64_t timestamp_end
; /* Cycle count at subbuffer end */
53 uint64_t content_size
; /* Size of data in subbuffer */
54 uint64_t packet_size
; /* Subbuffer size (include padding) */
55 unsigned long events_discarded
; /*
56 * Events lost in this subbuffer since
57 * the beginning of the trace.
60 uint32_t cpu_id
; /* CPU id associated with stream */
61 uint8_t header_end
; /* End of header */
66 static inline uint64_t lib_ring_buffer_clock_read(struct channel
*chan
)
68 return trace_clock_read64();
72 size_t ctx_get_size(size_t offset
, struct lttng_ctx
*ctx
)
75 size_t orig_offset
= offset
;
79 offset
+= lib_ring_buffer_align(offset
, ctx
->largest_align
);
80 for (i
= 0; i
< ctx
->nr_fields
; i
++)
81 offset
+= ctx
->fields
[i
].get_size(offset
);
82 return offset
- orig_offset
;
86 void ctx_record(struct lttng_ust_lib_ring_buffer_ctx
*bufctx
,
87 struct lttng_channel
*chan
,
88 struct lttng_ctx
*ctx
)
94 lib_ring_buffer_align_ctx(bufctx
, ctx
->largest_align
);
95 for (i
= 0; i
< ctx
->nr_fields
; i
++)
96 ctx
->fields
[i
].record(&ctx
->fields
[i
], bufctx
, chan
);
100 * record_header_size - Calculate the header size and padding necessary.
101 * @config: ring buffer instance configuration
103 * @offset: offset in the write buffer
104 * @pre_header_padding: padding to add before the header (output)
105 * @ctx: reservation context
107 * Returns the event header size (including padding).
109 * The payload must itself determine its own alignment from the biggest type it
113 size_t record_header_size(const struct lttng_ust_lib_ring_buffer_config
*config
,
114 struct channel
*chan
, size_t offset
,
115 size_t *pre_header_padding
,
116 struct lttng_ust_lib_ring_buffer_ctx
*ctx
)
118 struct lttng_channel
*lttng_chan
= channel_get_private(chan
);
119 struct lttng_event
*event
= ctx
->priv
;
120 size_t orig_offset
= offset
;
123 switch (lttng_chan
->header_type
) {
124 case 1: /* compact */
125 padding
= lib_ring_buffer_align(offset
, lttng_alignof(uint32_t));
127 if (!(ctx
->rflags
& (RING_BUFFER_RFLAG_FULL_TSC
| LTTNG_RFLAG_EXTENDED
))) {
128 offset
+= sizeof(uint32_t); /* id and timestamp */
130 /* Minimum space taken by LTTNG_COMPACT_EVENT_BITS id */
131 offset
+= (LTTNG_COMPACT_EVENT_BITS
+ CHAR_BIT
- 1) / CHAR_BIT
;
132 /* Align extended struct on largest member */
133 offset
+= lib_ring_buffer_align(offset
, lttng_alignof(uint64_t));
134 offset
+= sizeof(uint32_t); /* id */
135 offset
+= lib_ring_buffer_align(offset
, lttng_alignof(uint64_t));
136 offset
+= sizeof(uint64_t); /* timestamp */
140 padding
= lib_ring_buffer_align(offset
, lttng_alignof(uint16_t));
142 offset
+= sizeof(uint16_t);
143 if (!(ctx
->rflags
& (RING_BUFFER_RFLAG_FULL_TSC
| LTTNG_RFLAG_EXTENDED
))) {
144 offset
+= lib_ring_buffer_align(offset
, lttng_alignof(uint32_t));
145 offset
+= sizeof(uint32_t); /* timestamp */
147 /* Align extended struct on largest member */
148 offset
+= lib_ring_buffer_align(offset
, lttng_alignof(uint64_t));
149 offset
+= sizeof(uint32_t); /* id */
150 offset
+= lib_ring_buffer_align(offset
, lttng_alignof(uint64_t));
151 offset
+= sizeof(uint64_t); /* timestamp */
158 offset
+= ctx_get_size(offset
, event
->ctx
);
159 offset
+= ctx_get_size(offset
, lttng_chan
->ctx
);
161 *pre_header_padding
= padding
;
162 return offset
- orig_offset
;
165 #include "../libringbuffer/api.h"
166 #include "lttng-rb-clients.h"
169 void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config
*config
,
170 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
174 * lttng_write_event_header
176 * Writes the event header to the offset (already aligned on 32-bits).
178 * @config: ring buffer instance configuration
179 * @ctx: reservation context
180 * @event_id: event ID
183 void lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config
*config
,
184 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
187 struct lttng_channel
*lttng_chan
= channel_get_private(ctx
->chan
);
188 struct lttng_event
*event
= ctx
->priv
;
190 if (caa_unlikely(ctx
->rflags
))
193 switch (lttng_chan
->header_type
) {
194 case 1: /* compact */
196 uint32_t id_time
= 0;
198 bt_bitfield_write(&id_time
, uint32_t,
200 LTTNG_COMPACT_EVENT_BITS
,
202 bt_bitfield_write(&id_time
, uint32_t,
203 LTTNG_COMPACT_EVENT_BITS
,
204 LTTNG_COMPACT_TSC_BITS
,
206 lib_ring_buffer_write(config
, ctx
, &id_time
, sizeof(id_time
));
211 uint32_t timestamp
= (uint32_t) ctx
->tsc
;
212 uint16_t id
= event_id
;
214 lib_ring_buffer_write(config
, ctx
, &id
, sizeof(id
));
215 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(uint32_t));
216 lib_ring_buffer_write(config
, ctx
, ×tamp
, sizeof(timestamp
));
223 ctx_record(ctx
, lttng_chan
, lttng_chan
->ctx
);
224 ctx_record(ctx
, lttng_chan
, event
->ctx
);
225 lib_ring_buffer_align_ctx(ctx
, ctx
->largest_align
);
230 lttng_write_event_header_slow(config
, ctx
, event_id
);
234 void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config
*config
,
235 struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
238 struct lttng_channel
*lttng_chan
= channel_get_private(ctx
->chan
);
239 struct lttng_event
*event
= ctx
->priv
;
241 switch (lttng_chan
->header_type
) {
242 case 1: /* compact */
243 if (!(ctx
->rflags
& (RING_BUFFER_RFLAG_FULL_TSC
| LTTNG_RFLAG_EXTENDED
))) {
244 uint32_t id_time
= 0;
246 bt_bitfield_write(&id_time
, uint32_t,
248 LTTNG_COMPACT_EVENT_BITS
,
250 bt_bitfield_write(&id_time
, uint32_t,
251 LTTNG_COMPACT_EVENT_BITS
,
252 LTTNG_COMPACT_TSC_BITS
,
254 lib_ring_buffer_write(config
, ctx
, &id_time
, sizeof(id_time
));
257 uint64_t timestamp
= ctx
->tsc
;
259 bt_bitfield_write(&id
, uint8_t,
261 LTTNG_COMPACT_EVENT_BITS
,
263 lib_ring_buffer_write(config
, ctx
, &id
, sizeof(id
));
264 /* Align extended struct on largest member */
265 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(uint64_t));
266 lib_ring_buffer_write(config
, ctx
, &event_id
, sizeof(event_id
));
267 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(uint64_t));
268 lib_ring_buffer_write(config
, ctx
, ×tamp
, sizeof(timestamp
));
273 if (!(ctx
->rflags
& (RING_BUFFER_RFLAG_FULL_TSC
| LTTNG_RFLAG_EXTENDED
))) {
274 uint32_t timestamp
= (uint32_t) ctx
->tsc
;
275 uint16_t id
= event_id
;
277 lib_ring_buffer_write(config
, ctx
, &id
, sizeof(id
));
278 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(uint32_t));
279 lib_ring_buffer_write(config
, ctx
, ×tamp
, sizeof(timestamp
));
282 uint64_t timestamp
= ctx
->tsc
;
284 lib_ring_buffer_write(config
, ctx
, &id
, sizeof(id
));
285 /* Align extended struct on largest member */
286 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(uint64_t));
287 lib_ring_buffer_write(config
, ctx
, &event_id
, sizeof(event_id
));
288 lib_ring_buffer_align_ctx(ctx
, lttng_alignof(uint64_t));
289 lib_ring_buffer_write(config
, ctx
, ×tamp
, sizeof(timestamp
));
296 ctx_record(ctx
, lttng_chan
, lttng_chan
->ctx
);
297 ctx_record(ctx
, lttng_chan
, event
->ctx
);
298 lib_ring_buffer_align_ctx(ctx
, ctx
->largest_align
);
301 static const struct lttng_ust_lib_ring_buffer_config client_config
;
303 static uint64_t client_ring_buffer_clock_read(struct channel
*chan
)
305 return lib_ring_buffer_clock_read(chan
);
309 size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config
*config
,
310 struct channel
*chan
, size_t offset
,
311 size_t *pre_header_padding
,
312 struct lttng_ust_lib_ring_buffer_ctx
*ctx
)
314 return record_header_size(config
, chan
, offset
,
315 pre_header_padding
, ctx
);
319 * client_packet_header_size - called on buffer-switch to a new sub-buffer
321 * Return header size without padding after the structure. Don't use packed
322 * structure because gcc generates inefficient code on some architectures
325 static size_t client_packet_header_size(void)
327 return offsetof(struct packet_header
, ctx
.header_end
);
330 static void client_buffer_begin(struct lttng_ust_lib_ring_buffer
*buf
, uint64_t tsc
,
331 unsigned int subbuf_idx
,
332 struct lttng_ust_shm_handle
*handle
)
334 struct channel
*chan
= shmp(handle
, buf
->backend
.chan
);
335 struct packet_header
*header
=
336 (struct packet_header
*)
337 lib_ring_buffer_offset_address(&buf
->backend
,
338 subbuf_idx
* chan
->backend
.subbuf_size
,
340 struct lttng_channel
*lttng_chan
= channel_get_private(chan
);
345 header
->magic
= CTF_MAGIC_NUMBER
;
346 memcpy(header
->uuid
, lttng_chan
->uuid
, sizeof(lttng_chan
->uuid
));
347 header
->stream_id
= lttng_chan
->id
;
348 header
->ctx
.timestamp_begin
= tsc
;
349 header
->ctx
.timestamp_end
= 0;
350 header
->ctx
.content_size
= ~0ULL; /* for debugging */
351 header
->ctx
.packet_size
= ~0ULL;
352 header
->ctx
.events_discarded
= 0;
353 header
->ctx
.cpu_id
= buf
->backend
.cpu
;
357 * offset is assumed to never be 0 here : never deliver a completely empty
358 * subbuffer. data_size is between 1 and subbuf_size.
360 static void client_buffer_end(struct lttng_ust_lib_ring_buffer
*buf
, uint64_t tsc
,
361 unsigned int subbuf_idx
, unsigned long data_size
,
362 struct lttng_ust_shm_handle
*handle
)
364 struct channel
*chan
= shmp(handle
, buf
->backend
.chan
);
365 struct packet_header
*header
=
366 (struct packet_header
*)
367 lib_ring_buffer_offset_address(&buf
->backend
,
368 subbuf_idx
* chan
->backend
.subbuf_size
,
370 unsigned long records_lost
= 0;
375 header
->ctx
.timestamp_end
= tsc
;
376 header
->ctx
.content_size
=
377 (uint64_t) data_size
* CHAR_BIT
; /* in bits */
378 header
->ctx
.packet_size
=
379 (uint64_t) PAGE_ALIGN(data_size
) * CHAR_BIT
; /* in bits */
381 records_lost
+= lib_ring_buffer_get_records_lost_full(&client_config
, buf
);
382 records_lost
+= lib_ring_buffer_get_records_lost_wrap(&client_config
, buf
);
383 records_lost
+= lib_ring_buffer_get_records_lost_big(&client_config
, buf
);
384 header
->ctx
.events_discarded
= records_lost
;
387 static int client_buffer_create(struct lttng_ust_lib_ring_buffer
*buf
, void *priv
,
388 int cpu
, const char *name
, struct lttng_ust_shm_handle
*handle
)
393 static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer
*buf
, void *priv
, int cpu
, struct lttng_ust_shm_handle
*handle
)
397 static void client_content_size_field(const struct lttng_ust_lib_ring_buffer_config
*config
,
398 size_t *offset
, size_t *length
)
400 *offset
= offsetof(struct packet_header
, ctx
.content_size
);
401 *length
= sizeof(((struct packet_header
*) NULL
)->ctx
.content_size
);
404 static void client_packet_size_field(const struct lttng_ust_lib_ring_buffer_config
*config
,
405 size_t *offset
, size_t *length
)
407 *offset
= offsetof(struct packet_header
, ctx
.packet_size
);
408 *length
= sizeof(((struct packet_header
*) NULL
)->ctx
.packet_size
);
411 static struct packet_header
*client_packet_header(struct lttng_ust_lib_ring_buffer
*buf
,
412 struct lttng_ust_shm_handle
*handle
)
414 return lib_ring_buffer_read_offset_address(&buf
->backend
, 0, handle
);
417 static int client_timestamp_begin(struct lttng_ust_lib_ring_buffer
*buf
,
418 struct lttng_ust_shm_handle
*handle
,
419 uint64_t *timestamp_begin
)
421 struct packet_header
*header
;
423 header
= client_packet_header(buf
, handle
);
426 *timestamp_begin
= header
->ctx
.timestamp_begin
;
430 static int client_timestamp_end(struct lttng_ust_lib_ring_buffer
*buf
,
431 struct lttng_ust_shm_handle
*handle
,
432 uint64_t *timestamp_end
)
434 struct packet_header
*header
;
436 header
= client_packet_header(buf
, handle
);
439 *timestamp_end
= header
->ctx
.timestamp_end
;
443 static int client_events_discarded(struct lttng_ust_lib_ring_buffer
*buf
,
444 struct lttng_ust_shm_handle
*handle
,
445 uint64_t *events_discarded
)
447 struct packet_header
*header
;
449 header
= client_packet_header(buf
, handle
);
452 *events_discarded
= header
->ctx
.events_discarded
;
456 static int client_content_size(struct lttng_ust_lib_ring_buffer
*buf
,
457 struct lttng_ust_shm_handle
*handle
,
458 uint64_t *content_size
)
460 struct packet_header
*header
;
462 header
= client_packet_header(buf
, handle
);
465 *content_size
= header
->ctx
.content_size
;
469 static int client_packet_size(struct lttng_ust_lib_ring_buffer
*buf
,
470 struct lttng_ust_shm_handle
*handle
,
471 uint64_t *packet_size
)
473 struct packet_header
*header
;
475 header
= client_packet_header(buf
, handle
);
478 *packet_size
= header
->ctx
.packet_size
;
482 static int client_stream_id(struct lttng_ust_lib_ring_buffer
*buf
,
483 struct lttng_ust_shm_handle
*handle
,
486 struct packet_header
*header
;
488 header
= client_packet_header(buf
, handle
);
491 *stream_id
= header
->stream_id
;
495 static int client_current_timestamp(struct lttng_ust_lib_ring_buffer
*buf
,
496 struct lttng_ust_shm_handle
*handle
,
499 struct channel
*chan
;
501 chan
= shmp(handle
, handle
->chan
);
502 *ts
= client_ring_buffer_clock_read(chan
);
508 struct lttng_ust_client_lib_ring_buffer_client_cb client_cb
= {
510 .ring_buffer_clock_read
= client_ring_buffer_clock_read
,
511 .record_header_size
= client_record_header_size
,
512 .subbuffer_header_size
= client_packet_header_size
,
513 .buffer_begin
= client_buffer_begin
,
514 .buffer_end
= client_buffer_end
,
515 .buffer_create
= client_buffer_create
,
516 .buffer_finalize
= client_buffer_finalize
,
517 .content_size_field
= client_content_size_field
,
518 .packet_size_field
= client_packet_size_field
,
520 .timestamp_begin
= client_timestamp_begin
,
521 .timestamp_end
= client_timestamp_end
,
522 .events_discarded
= client_events_discarded
,
523 .content_size
= client_content_size
,
524 .packet_size
= client_packet_size
,
525 .stream_id
= client_stream_id
,
526 .current_timestamp
= client_current_timestamp
,
529 static const struct lttng_ust_lib_ring_buffer_config client_config
= {
530 .cb
.ring_buffer_clock_read
= client_ring_buffer_clock_read
,
531 .cb
.record_header_size
= client_record_header_size
,
532 .cb
.subbuffer_header_size
= client_packet_header_size
,
533 .cb
.buffer_begin
= client_buffer_begin
,
534 .cb
.buffer_end
= client_buffer_end
,
535 .cb
.buffer_create
= client_buffer_create
,
536 .cb
.buffer_finalize
= client_buffer_finalize
,
537 .cb
.content_size_field
= client_content_size_field
,
538 .cb
.packet_size_field
= client_packet_size_field
,
540 .tsc_bits
= LTTNG_COMPACT_TSC_BITS
,
541 .alloc
= RING_BUFFER_ALLOC_PER_CPU
,
542 .sync
= RING_BUFFER_SYNC_GLOBAL
,
543 .mode
= RING_BUFFER_MODE_TEMPLATE
,
544 .backend
= RING_BUFFER_PAGE
,
545 .output
= RING_BUFFER_MMAP
,
546 .oops
= RING_BUFFER_OOPS_CONSISTENCY
,
547 .ipi
= RING_BUFFER_NO_IPI_BARRIER
,
548 .wakeup
= LTTNG_CLIENT_WAKEUP
,
549 .client_type
= LTTNG_CLIENT_TYPE
,
551 .cb_ptr
= &client_cb
.parent
,
554 const struct lttng_ust_client_lib_ring_buffer_client_cb
*LTTNG_CLIENT_CALLBACKS
= &client_cb
;
557 struct lttng_channel
*_channel_create(const char *name
,
559 size_t subbuf_size
, size_t num_subbuf
,
560 unsigned int switch_timer_interval
,
561 unsigned int read_timer_interval
,
564 const int *stream_fds
, int nr_stream_fds
)
566 struct lttng_channel chan_priv_init
;
567 struct lttng_ust_shm_handle
*handle
;
568 struct lttng_channel
*lttng_chan
;
571 memset(&chan_priv_init
, 0, sizeof(chan_priv_init
));
572 memcpy(chan_priv_init
.uuid
, uuid
, LTTNG_UST_UUID_LEN
);
573 chan_priv_init
.id
= chan_id
;
574 handle
= channel_create(&client_config
, name
,
575 &priv
, __alignof__(struct lttng_channel
),
576 sizeof(struct lttng_channel
),
578 buf_addr
, subbuf_size
, num_subbuf
,
579 switch_timer_interval
, read_timer_interval
,
580 stream_fds
, nr_stream_fds
);
584 lttng_chan
->handle
= handle
;
585 lttng_chan
->chan
= shmp(handle
, handle
->chan
);
590 void lttng_channel_destroy(struct lttng_channel
*chan
)
592 channel_destroy(chan
->chan
, chan
->handle
, 1);
596 int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx
*ctx
,
599 struct lttng_channel
*lttng_chan
= channel_get_private(ctx
->chan
);
602 cpu
= lib_ring_buffer_get_cpu(&client_config
);
607 switch (lttng_chan
->header_type
) {
608 case 1: /* compact */
610 ctx
->rflags
|= LTTNG_RFLAG_EXTENDED
;
613 if (event_id
> 65534)
614 ctx
->rflags
|= LTTNG_RFLAG_EXTENDED
;
620 ret
= lib_ring_buffer_reserve(&client_config
, ctx
);
623 lttng_write_event_header(&client_config
, ctx
, event_id
);
626 lib_ring_buffer_put_cpu(&client_config
);
631 void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx
*ctx
)
633 lib_ring_buffer_commit(&client_config
, ctx
);
634 lib_ring_buffer_put_cpu(&client_config
);
638 void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx
*ctx
, const void *src
,
641 lib_ring_buffer_write(&client_config
, ctx
, src
, len
);
645 void lttng_event_strcpy(struct lttng_ust_lib_ring_buffer_ctx
*ctx
, const char *src
,
648 lib_ring_buffer_strcpy(&client_config
, ctx
, src
, len
, '#');
653 wait_queue_head_t
*lttng_get_reader_wait_queue(struct channel
*chan
)
655 return &chan
->read_wait
;
659 wait_queue_head_t
*lttng_get_hp_wait_queue(struct channel
*chan
)
661 return &chan
->hp_wait
;
666 int lttng_is_finalized(struct channel
*chan
)
668 return lib_ring_buffer_channel_is_finalized(chan
);
672 int lttng_is_disabled(struct channel
*chan
)
674 return lib_ring_buffer_channel_is_disabled(chan
);
678 int lttng_flush_buffer(struct channel
*chan
, struct lttng_ust_shm_handle
*handle
)
680 struct lttng_ust_lib_ring_buffer
*buf
;
683 for_each_channel_cpu(cpu
, chan
) {
684 int shm_fd
, wait_fd
, wakeup_fd
;
685 uint64_t memory_map_size
;
687 buf
= channel_get_ring_buffer(&client_config
, chan
,
688 cpu
, handle
, &shm_fd
, &wait_fd
,
689 &wakeup_fd
, &memory_map_size
);
690 lib_ring_buffer_switch(&client_config
, buf
,
691 SWITCH_ACTIVE
, handle
);
696 static struct lttng_transport lttng_relay_transport
= {
697 .name
= "relay-" RING_BUFFER_MODE_TEMPLATE_STRING
"-mmap",
699 .channel_create
= _channel_create
,
700 .channel_destroy
= lttng_channel_destroy
,
702 .event_reserve
= lttng_event_reserve
,
703 .event_commit
= lttng_event_commit
,
704 .event_write
= lttng_event_write
,
705 .packet_avail_size
= NULL
, /* Would be racy anyway */
706 //.get_reader_wait_queue = lttng_get_reader_wait_queue,
707 //.get_hp_wait_queue = lttng_get_hp_wait_queue,
708 .is_finalized
= lttng_is_finalized
,
709 .is_disabled
= lttng_is_disabled
,
710 .flush_buffer
= lttng_flush_buffer
,
711 .event_strcpy
= lttng_event_strcpy
,
713 .client_config
= &client_config
,
716 void RING_BUFFER_MODE_TEMPLATE_INIT(void)
718 DBG("LTT : ltt ring buffer client \"%s\" init\n",
719 "relay-" RING_BUFFER_MODE_TEMPLATE_STRING
"-mmap");
720 lttng_transport_register(<tng_relay_transport
);
723 void RING_BUFFER_MODE_TEMPLATE_EXIT(void)
725 DBG("LTT : ltt ring buffer client \"%s\" exit\n",
726 "relay-" RING_BUFFER_MODE_TEMPLATE_STRING
"-mmap");
727 lttng_transport_unregister(<tng_relay_transport
);