[lttng-ust.git] / liblttng-ust / ltt-ring-buffer-metadata-client.h

/*
 * ltt-ring-buffer-client.h
 *
 * Copyright (C) 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * LTTng lib ring buffer client template.
 *
 * Dual LGPL v2.1/GPL v2 license.
 */

#include <stdint.h>
#include <lttng/ust-events.h>
#include "lttng/bitfield.h"
#include "ltt-tracer.h"
#include "../libringbuffer/frontend_types.h"

struct metadata_packet_header {
	uint32_t magic;			/* 0x75D11D57 */
	uint8_t  uuid[16];		/* Unique Universal Identifier */
	uint32_t checksum;		/* 0 if unused */
	uint32_t content_size;		/* in bits */
	uint32_t packet_size;		/* in bits */
	uint8_t  compression_scheme;	/* 0 if unused */
	uint8_t  encryption_scheme;	/* 0 if unused */
	uint8_t  checksum_scheme;	/* 0 if unused */
	uint8_t  major;			/* CTF spec major version number */
	uint8_t  minor;			/* CTF spec minor version number */
	uint8_t  header_end[0];
};

struct metadata_record_header {
	uint8_t header_end[0];		/* End of header */
};

static const struct lttng_ust_lib_ring_buffer_config client_config;

static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan)
{
	return 0;
}

static inline
unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
				 struct channel *chan, size_t offset,
				 size_t *pre_header_padding,
				 struct lttng_ust_lib_ring_buffer_ctx *ctx)
{
	return 0;
}

#include "../libringbuffer/api.h"

static uint64_t client_ring_buffer_clock_read(struct channel *chan)
{
	return 0;
}

static
size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
				 struct channel *chan, size_t offset,
				 size_t *pre_header_padding,
				 struct lttng_ust_lib_ring_buffer_ctx *ctx)
{
	return 0;
}

/**
 * client_packet_header_size - called on buffer-switch to a new sub-buffer
 *
 * Return header size without padding after the structure. Don't use packed
 * structure because gcc generates inefficient code on some architectures
 * (powerpc, mips..)
 */
static size_t client_packet_header_size(void)
{
	return offsetof(struct metadata_packet_header, header_end);
}

static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
				unsigned int subbuf_idx,
				struct lttng_ust_shm_handle *handle)
{
	struct channel *chan = shmp(handle, buf->backend.chan);
	struct metadata_packet_header *header =
		(struct metadata_packet_header *)
			lib_ring_buffer_offset_address(&buf->backend,
				subbuf_idx * chan->backend.subbuf_size,
				handle);
	struct ltt_channel *ltt_chan = channel_get_private(chan);

	header->magic = TSDL_MAGIC_NUMBER;
	memcpy(header->uuid, ltt_chan->uuid, sizeof(ltt_chan->uuid));
	header->checksum = 0;		/* 0 if unused */
	header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
	header->packet_size = 0xFFFFFFFF;  /* in bits, for debugging */
	header->compression_scheme = 0;	/* 0 if unused */
	header->encryption_scheme = 0;	/* 0 if unused */
	header->checksum_scheme = 0;	/* 0 if unused */
	header->major = CTF_SPEC_MAJOR;
	header->minor = CTF_SPEC_MINOR;

}

/*
 * offset is assumed to never be 0 here : never deliver a completely empty
 * subbuffer. data_size is between 1 and subbuf_size.
 */
static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
			      unsigned int subbuf_idx, unsigned long data_size,
			      struct lttng_ust_shm_handle *handle)
{
	struct channel *chan = shmp(handle, buf->backend.chan);
	struct metadata_packet_header *header =
		(struct metadata_packet_header *)
			lib_ring_buffer_offset_address(&buf->backend,
				subbuf_idx * chan->backend.subbuf_size,
				handle);
	unsigned long records_lost = 0;

	header->content_size = data_size * CHAR_BIT;		/* in bits */
	header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
	records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf);
	records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
	records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
	WARN_ON_ONCE(records_lost != 0);
}

static int client_buffer_create(struct lttng_ust_lib_ring_buffer *buf, void *priv,
				int cpu, const char *name,
				struct lttng_ust_shm_handle *handle)
{
	return 0;
}

static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf,
				   void *priv, int cpu,
				   struct lttng_ust_shm_handle *handle)
{
}

static const struct lttng_ust_lib_ring_buffer_config client_config = {
	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
	.cb.record_header_size = client_record_header_size,
	.cb.subbuffer_header_size = client_packet_header_size,
	.cb.buffer_begin = client_buffer_begin,
	.cb.buffer_end = client_buffer_end,
	.cb.buffer_create = client_buffer_create,
	.cb.buffer_finalize = client_buffer_finalize,

	.tsc_bits = 0,
	.alloc = RING_BUFFER_ALLOC_GLOBAL,
	.sync = RING_BUFFER_SYNC_GLOBAL,
	.mode = RING_BUFFER_MODE_TEMPLATE,
	.backend = RING_BUFFER_PAGE,
	.output = RING_BUFFER_MMAP,
	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	.ipi = RING_BUFFER_NO_IPI_BARRIER,
	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
	.client_type = LTTNG_CLIENT_TYPE,
};

const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_config.cb;

static
struct ltt_channel *_channel_create(const char *name,
				void *buf_addr,
				size_t subbuf_size, size_t num_subbuf,
				unsigned int switch_timer_interval,
				unsigned int read_timer_interval,
				int **shm_fd, int **wait_fd,
				uint64_t **memory_map_size,
				struct ltt_channel *chan_priv_init)
{
	void *priv;
	struct ltt_channel *ltt_chan = NULL;
	struct lttng_ust_shm_handle *handle;

	handle = channel_create(&client_config, name,
			&priv, __alignof__(*ltt_chan), sizeof(*ltt_chan),
			chan_priv_init,
			buf_addr, subbuf_size, num_subbuf,
			switch_timer_interval, read_timer_interval,
			shm_fd, wait_fd, memory_map_size);
	if (!handle)
		return NULL;
	ltt_chan = priv;
	ltt_chan->handle = handle;
	ltt_chan->chan = shmp(ltt_chan->handle, ltt_chan->handle->chan);
	return ltt_chan;
}

static
void ltt_channel_destroy(struct ltt_channel *ltt_chan)
{
	channel_destroy(ltt_chan->chan, ltt_chan->handle, 0);
}

static
struct lttng_ust_lib_ring_buffer *ltt_buffer_read_open(struct channel *chan,
					     struct lttng_ust_shm_handle *handle,
					     int **shm_fd, int **wait_fd,
					     uint64_t **memory_map_size)
{
	struct lttng_ust_lib_ring_buffer *buf;

	buf = channel_get_ring_buffer(&client_config, chan,
			0, handle, shm_fd, wait_fd, memory_map_size);
	if (!lib_ring_buffer_open_read(buf, handle, 0))
		return buf;
	return NULL;
}

static
void ltt_buffer_read_close(struct lttng_ust_lib_ring_buffer *buf,
			   struct lttng_ust_shm_handle *handle)
{
	lib_ring_buffer_release_read(buf, handle, 0);
}

static
int ltt_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id)
{
	return lib_ring_buffer_reserve(&client_config, ctx);
}

static
void ltt_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx)
{
	lib_ring_buffer_commit(&client_config, ctx);
}

static
void ltt_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *src,
		     size_t len)
{
	lib_ring_buffer_write(&client_config, ctx, src, len);
}

static
size_t ltt_packet_avail_size(struct channel *chan, struct lttng_ust_shm_handle *handle)
			     
{
	unsigned long o_begin;
	struct lttng_ust_lib_ring_buffer *buf;

	buf = shmp(handle, chan->backend.buf[0].shmp);	/* Only for global buffer ! */
	o_begin = v_read(&client_config, &buf->offset);
	if (subbuf_offset(o_begin, chan) != 0) {
		return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
	} else {
		return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
			- sizeof(struct metadata_packet_header);
	}
}

#if 0
static
wait_queue_head_t *ltt_get_reader_wait_queue(struct channel *chan)
{
	return &chan->read_wait;
}

static
wait_queue_head_t *ltt_get_hp_wait_queue(struct channel *chan)
{
	return &chan->hp_wait;
}
#endif //0

static
int ltt_is_finalized(struct channel *chan)
{
	return lib_ring_buffer_channel_is_finalized(chan);
}

static
int ltt_is_disabled(struct channel *chan)
{
	return lib_ring_buffer_channel_is_disabled(chan);
}

static
int ltt_flush_buffer(struct channel *chan, struct lttng_ust_shm_handle *handle)
{
	struct lttng_ust_lib_ring_buffer *buf;
	int *shm_fd, *wait_fd;
	uint64_t *memory_map_size;

	buf = channel_get_ring_buffer(&client_config, chan,
			0, handle, &shm_fd, &wait_fd,
			&memory_map_size);
	lib_ring_buffer_switch(&client_config, buf,
			SWITCH_ACTIVE, handle);
	return 0;
}

static struct ltt_transport ltt_relay_transport = {
	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
	.ops = {
		.channel_create = _channel_create,
		.channel_destroy = ltt_channel_destroy,
		.buffer_read_open = ltt_buffer_read_open,
		.buffer_read_close = ltt_buffer_read_close,
		.event_reserve = ltt_event_reserve,
		.event_commit = ltt_event_commit,
		.event_write = ltt_event_write,
		.packet_avail_size = ltt_packet_avail_size,
		//.get_reader_wait_queue = ltt_get_reader_wait_queue,
		//.get_hp_wait_queue = ltt_get_hp_wait_queue,
		.is_finalized = ltt_is_finalized,
		.is_disabled = ltt_is_disabled,
		.flush_buffer = ltt_flush_buffer,
	},
};

void RING_BUFFER_MODE_TEMPLATE_INIT(void)
{
	DBG("LTT : ltt ring buffer client init\n");
	ltt_transport_register(&ltt_relay_transport);
}

void RING_BUFFER_MODE_TEMPLATE_EXIT(void)
{
	DBG("LTT : ltt ring buffer client exit\n");
	ltt_transport_unregister(&ltt_relay_transport);
}
Commit	Line	Data
	1	/*
	2	* ltt-ring-buffer-client.h
	3	*
	4	* Copyright (C) 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	5	*
	6	* LTTng lib ring buffer client template.
	7	*
	8	* Dual LGPL v2.1/GPL v2 license.
	9	*/
	10
	11	#include <stdint.h>
	12	#include <lttng/ust-events.h>
	13	#include "lttng/bitfield.h"
	14	#include "ltt-tracer.h"
	15	#include "../libringbuffer/frontend_types.h"
	16
	17	struct metadata_packet_header {
	18	uint32_t magic; /* 0x75D11D57 */
	19	uint8_t uuid[16]; /* Unique Universal Identifier */
	20	uint32_t checksum; /* 0 if unused */
	21	uint32_t content_size; /* in bits */
	22	uint32_t packet_size; /* in bits */
	23	uint8_t compression_scheme; /* 0 if unused */
	24	uint8_t encryption_scheme; /* 0 if unused */
	25	uint8_t checksum_scheme; /* 0 if unused */
	26	uint8_t major; /* CTF spec major version number */
	27	uint8_t minor; /* CTF spec minor version number */
	28	uint8_t header_end[0];
	29	};
	30
	31	struct metadata_record_header {
	32	uint8_t header_end[0]; /* End of header */
	33	};
	34
	35	static const struct lttng_ust_lib_ring_buffer_config client_config;
	36
	37	static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan)
	38	{
	39	return 0;
	40	}
	41
	42	static inline
	43	unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
	44	struct channel *chan, size_t offset,
	45	size_t *pre_header_padding,
	46	struct lttng_ust_lib_ring_buffer_ctx *ctx)
	47	{
	48	return 0;
	49	}
	50
	51	#include "../libringbuffer/api.h"
	52
	53	static uint64_t client_ring_buffer_clock_read(struct channel *chan)
	54	{
	55	return 0;
	56	}
	57
	58	static
	59	size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
	60	struct channel *chan, size_t offset,
	61	size_t *pre_header_padding,
	62	struct lttng_ust_lib_ring_buffer_ctx *ctx)
	63	{
	64	return 0;
	65	}
	66
	67	/**
	68	* client_packet_header_size - called on buffer-switch to a new sub-buffer
	69	*
	70	* Return header size without padding after the structure. Don't use packed
	71	* structure because gcc generates inefficient code on some architectures
	72	* (powerpc, mips..)
	73	*/
	74	static size_t client_packet_header_size(void)
	75	{
	76	return offsetof(struct metadata_packet_header, header_end);
	77	}
	78
	79	static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
	80	unsigned int subbuf_idx,
	81	struct lttng_ust_shm_handle *handle)
	82	{
	83	struct channel *chan = shmp(handle, buf->backend.chan);
	84	struct metadata_packet_header *header =
	85	(struct metadata_packet_header *)
	86	lib_ring_buffer_offset_address(&buf->backend,
	87	subbuf_idx * chan->backend.subbuf_size,
	88	handle);
	89	struct ltt_channel *ltt_chan = channel_get_private(chan);
	90
	91	header->magic = TSDL_MAGIC_NUMBER;
	92	memcpy(header->uuid, ltt_chan->uuid, sizeof(ltt_chan->uuid));
	93	header->checksum = 0; /* 0 if unused */
	94	header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
	95	header->packet_size = 0xFFFFFFFF; /* in bits, for debugging */
	96	header->compression_scheme = 0; /* 0 if unused */
	97	header->encryption_scheme = 0; /* 0 if unused */
	98	header->checksum_scheme = 0; /* 0 if unused */
	99	header->major = CTF_SPEC_MAJOR;
	100	header->minor = CTF_SPEC_MINOR;
	101
	102	}
	103
	104	/*
	105	* offset is assumed to never be 0 here : never deliver a completely empty
	106	* subbuffer. data_size is between 1 and subbuf_size.
	107	*/
	108	static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
	109	unsigned int subbuf_idx, unsigned long data_size,
	110	struct lttng_ust_shm_handle *handle)
	111	{
	112	struct channel *chan = shmp(handle, buf->backend.chan);
	113	struct metadata_packet_header *header =
	114	(struct metadata_packet_header *)
	115	lib_ring_buffer_offset_address(&buf->backend,
	116	subbuf_idx * chan->backend.subbuf_size,
	117	handle);
	118	unsigned long records_lost = 0;
	119
	120	header->content_size = data_size * CHAR_BIT; /* in bits */
	121	header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
	122	records_lost += lib_ring_buffer_get_records_lost_full(&client_config, buf);
	123	records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
	124	records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
	125	WARN_ON_ONCE(records_lost != 0);
	126	}
	127
	128	static int client_buffer_create(struct lttng_ust_lib_ring_buffer buf, void priv,
	129	int cpu, const char *name,
	130	struct lttng_ust_shm_handle *handle)
	131	{
	132	return 0;
	133	}
	134
	135	static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf,
	136	void *priv, int cpu,
	137	struct lttng_ust_shm_handle *handle)
	138	{
	139	}
	140
	141	static const struct lttng_ust_lib_ring_buffer_config client_config = {
	142	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
	143	.cb.record_header_size = client_record_header_size,
	144	.cb.subbuffer_header_size = client_packet_header_size,
	145	.cb.buffer_begin = client_buffer_begin,
	146	.cb.buffer_end = client_buffer_end,
	147	.cb.buffer_create = client_buffer_create,
	148	.cb.buffer_finalize = client_buffer_finalize,
	149
	150	.tsc_bits = 0,
	151	.alloc = RING_BUFFER_ALLOC_GLOBAL,
	152	.sync = RING_BUFFER_SYNC_GLOBAL,
	153	.mode = RING_BUFFER_MODE_TEMPLATE,
	154	.backend = RING_BUFFER_PAGE,
	155	.output = RING_BUFFER_MMAP,
	156	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	157	.ipi = RING_BUFFER_NO_IPI_BARRIER,
	158	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
	159	.client_type = LTTNG_CLIENT_TYPE,
	160	};
	161
	162	const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_config.cb;
	163
	164	static
	165	struct ltt_channel _channel_create(const char name,
	166	void *buf_addr,
	167	size_t subbuf_size, size_t num_subbuf,
	168	unsigned int switch_timer_interval,
	169	unsigned int read_timer_interval,
	170	int shm_fd, int wait_fd,
	171	uint64_t **memory_map_size,
	172	struct ltt_channel *chan_priv_init)
	173	{
	174	void *priv;
	175	struct ltt_channel *ltt_chan = NULL;
	176	struct lttng_ust_shm_handle *handle;
	177
	178	handle = channel_create(&client_config, name,
	179	&priv, __alignof__(ltt_chan), sizeof(ltt_chan),
	180	chan_priv_init,
	181	buf_addr, subbuf_size, num_subbuf,
	182	switch_timer_interval, read_timer_interval,
	183	shm_fd, wait_fd, memory_map_size);
	184	if (!handle)
	185	return NULL;
	186	ltt_chan = priv;
	187	ltt_chan->handle = handle;
	188	ltt_chan->chan = shmp(ltt_chan->handle, ltt_chan->handle->chan);
	189	return ltt_chan;
	190	}
	191
	192	static
	193	void ltt_channel_destroy(struct ltt_channel *ltt_chan)
	194	{
	195	channel_destroy(ltt_chan->chan, ltt_chan->handle, 0);
	196	}
	197
	198	static
	199	struct lttng_ust_lib_ring_buffer ltt_buffer_read_open(struct channel chan,
	200	struct lttng_ust_shm_handle *handle,
	201	int shm_fd, int wait_fd,
	202	uint64_t **memory_map_size)
	203	{
	204	struct lttng_ust_lib_ring_buffer *buf;
	205
	206	buf = channel_get_ring_buffer(&client_config, chan,
	207	0, handle, shm_fd, wait_fd, memory_map_size);
	208	if (!lib_ring_buffer_open_read(buf, handle, 0))
	209	return buf;
	210	return NULL;
	211	}
	212
	213	static
	214	void ltt_buffer_read_close(struct lttng_ust_lib_ring_buffer *buf,
	215	struct lttng_ust_shm_handle *handle)
	216	{
	217	lib_ring_buffer_release_read(buf, handle, 0);
	218	}
	219
	220	static
	221	int ltt_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id)
	222	{
	223	return lib_ring_buffer_reserve(&client_config, ctx);
	224	}
	225
	226	static
	227	void ltt_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx)
	228	{
	229	lib_ring_buffer_commit(&client_config, ctx);
	230	}
	231
	232	static
	233	void ltt_event_write(struct lttng_ust_lib_ring_buffer_ctx ctx, const void src,
	234	size_t len)
	235	{
	236	lib_ring_buffer_write(&client_config, ctx, src, len);
	237	}
	238
	239	static
	240	size_t ltt_packet_avail_size(struct channel chan, struct lttng_ust_shm_handle handle)
	241
	242	{
	243	unsigned long o_begin;
	244	struct lttng_ust_lib_ring_buffer *buf;
	245
	246	buf = shmp(handle, chan->backend.buf[0].shmp); /* Only for global buffer ! */
	247	o_begin = v_read(&client_config, &buf->offset);
	248	if (subbuf_offset(o_begin, chan) != 0) {
	249	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
	250	} else {
	251	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
	252	- sizeof(struct metadata_packet_header);
	253	}
	254	}
	255
	256	#if 0
	257	static
	258	wait_queue_head_t ltt_get_reader_wait_queue(struct channel chan)
	259	{
	260	return &chan->read_wait;
	261	}
	262
	263	static
	264	wait_queue_head_t ltt_get_hp_wait_queue(struct channel chan)
	265	{
	266	return &chan->hp_wait;
	267	}
	268	#endif //0
	269
	270	static
	271	int ltt_is_finalized(struct channel *chan)
	272	{
	273	return lib_ring_buffer_channel_is_finalized(chan);
	274	}
	275
	276	static
	277	int ltt_is_disabled(struct channel *chan)
	278	{
	279	return lib_ring_buffer_channel_is_disabled(chan);
	280	}
	281
	282	static
	283	int ltt_flush_buffer(struct channel chan, struct lttng_ust_shm_handle handle)
	284	{
	285	struct lttng_ust_lib_ring_buffer *buf;
	286	int shm_fd, wait_fd;
	287	uint64_t *memory_map_size;
	288
	289	buf = channel_get_ring_buffer(&client_config, chan,
	290	0, handle, &shm_fd, &wait_fd,
	291	&memory_map_size);
	292	lib_ring_buffer_switch(&client_config, buf,
	293	SWITCH_ACTIVE, handle);
	294	return 0;
	295	}
	296
	297	static struct ltt_transport ltt_relay_transport = {
	298	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
	299	.ops = {
	300	.channel_create = _channel_create,
	301	.channel_destroy = ltt_channel_destroy,
	302	.buffer_read_open = ltt_buffer_read_open,
	303	.buffer_read_close = ltt_buffer_read_close,
	304	.event_reserve = ltt_event_reserve,
	305	.event_commit = ltt_event_commit,
	306	.event_write = ltt_event_write,
	307	.packet_avail_size = ltt_packet_avail_size,
	308	//.get_reader_wait_queue = ltt_get_reader_wait_queue,
	309	//.get_hp_wait_queue = ltt_get_hp_wait_queue,
	310	.is_finalized = ltt_is_finalized,
	311	.is_disabled = ltt_is_disabled,
	312	.flush_buffer = ltt_flush_buffer,
	313	},
	314	};
	315
	316	void RING_BUFFER_MODE_TEMPLATE_INIT(void)
	317	{
	318	DBG("LTT : ltt ring buffer client init\n");
	319	ltt_transport_register(&ltt_relay_transport);
	320	}
	321
	322	void RING_BUFFER_MODE_TEMPLATE_EXIT(void)
	323	{
	324	DBG("LTT : ltt ring buffer client exit\n");
	325	ltt_transport_unregister(&ltt_relay_transport);
	326	}