* LTTng lib ring buffer client template.
*/
+#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include "context-internal.h"
#include "lttng-tracer.h"
#include "../libringbuffer/frontend_types.h"
+#include <urcu/tls-compat.h>
#define LTTNG_COMPACT_EVENT_BITS 5
#define LTTNG_COMPACT_TSC_BITS 27
struct lttng_ust_ctx *event_ctx;
};
+/*
+ * Indexed by lib_ring_buffer_nesting_count().
+ */
+typedef struct lttng_ust_lib_ring_buffer_ctx_private private_ctx_stack_t[LIB_RING_BUFFER_MAX_NESTING];
+static DEFINE_URCU_TLS(private_ctx_stack_t, private_ctx_stack);
+
+/*
+ * Force a read (imply TLS fixup for dlopen) of TLS variables.
+ */
+void RING_BUFFER_MODE_TEMPLATE_TLS_FIXUP(void)
+{
+ asm volatile ("" : : "m" (URCU_TLS(private_ctx_stack)));
+}
+
static inline uint64_t lib_ring_buffer_clock_read(struct lttng_ust_lib_ring_buffer_channel *chan)
{
return trace_clock_read64();
if (caa_likely(!ctx))
return 0;
- offset += lib_ring_buffer_align(offset, ctx->largest_align);
+ offset += lttng_ust_lib_ring_buffer_align(offset, ctx->largest_align);
offset += ctx_len;
return offset - orig_offset;
}
if (caa_likely(!ctx))
return;
- lib_ring_buffer_align_ctx(bufctx, ctx->largest_align);
+ lttng_ust_lib_ring_buffer_align_ctx(bufctx, ctx->largest_align);
for (i = 0; i < ctx->nr_fields; i++) {
if (mode == APP_CTX_ENABLED) {
ctx->fields[i]->record(ctx->fields[i], bufctx, chan);
switch (lttng_chan->priv->header_type) {
case 1: /* compact */
- padding = lib_ring_buffer_align(offset, lttng_alignof(uint32_t));
+ padding = lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint32_t));
offset += padding;
- if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) {
+ if (!(ctx->priv->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) {
offset += sizeof(uint32_t); /* id and timestamp */
} else {
/* Minimum space taken by LTTNG_COMPACT_EVENT_BITS id */
offset += (LTTNG_COMPACT_EVENT_BITS + CHAR_BIT - 1) / CHAR_BIT;
/* Align extended struct on largest member */
- offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t));
+ offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint64_t));
offset += sizeof(uint32_t); /* id */
- offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t));
+ offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint64_t));
offset += sizeof(uint64_t); /* timestamp */
}
break;
case 2: /* large */
- padding = lib_ring_buffer_align(offset, lttng_alignof(uint16_t));
+ padding = lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint16_t));
offset += padding;
offset += sizeof(uint16_t);
- if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) {
- offset += lib_ring_buffer_align(offset, lttng_alignof(uint32_t));
+ if (!(ctx->priv->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) {
+ offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint32_t));
offset += sizeof(uint32_t); /* timestamp */
} else {
/* Align extended struct on largest member */
- offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t));
+ offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint64_t));
offset += sizeof(uint32_t); /* id */
- offset += lib_ring_buffer_align(offset, lttng_alignof(uint64_t));
+ offset += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(uint64_t));
offset += sizeof(uint64_t); /* timestamp */
}
break;
struct lttng_client_ctx *client_ctx,
uint32_t event_id)
{
- struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->chan);
+ struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->priv->chan);
- if (caa_unlikely(ctx->rflags))
+ if (caa_unlikely(ctx->priv->rflags))
goto slow_path;
switch (lttng_chan->priv->header_type) {
bt_bitfield_write(&id_time, uint32_t,
LTTNG_COMPACT_EVENT_BITS,
LTTNG_COMPACT_TSC_BITS,
- ctx->tsc);
+ ctx->priv->tsc);
lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time));
break;
}
case 2: /* large */
{
- uint32_t timestamp = (uint32_t) ctx->tsc;
+ uint32_t timestamp = (uint32_t) ctx->priv->tsc;
uint16_t id = event_id;
lib_ring_buffer_write(config, ctx, &id, sizeof(id));
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint32_t));
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint32_t));
lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp));
break;
}
ctx_record(ctx, lttng_chan, client_ctx->chan_ctx, APP_CTX_ENABLED);
ctx_record(ctx, lttng_chan, client_ctx->event_ctx, APP_CTX_ENABLED);
- lib_ring_buffer_align_ctx(ctx, ctx->largest_align);
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, ctx->largest_align);
return;
struct lttng_client_ctx *client_ctx,
uint32_t event_id)
{
- struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->chan);
+ struct lttng_ust_lib_ring_buffer_ctx_private *ctx_private = ctx->priv;
+ struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->priv->chan);
switch (lttng_chan->priv->header_type) {
case 1: /* compact */
- if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) {
+ if (!(ctx_private->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) {
uint32_t id_time = 0;
bt_bitfield_write(&id_time, uint32_t,
bt_bitfield_write(&id_time, uint32_t,
LTTNG_COMPACT_EVENT_BITS,
LTTNG_COMPACT_TSC_BITS,
- ctx->tsc);
+ ctx_private->tsc);
lib_ring_buffer_write(config, ctx, &id_time, sizeof(id_time));
} else {
uint8_t id = 0;
- uint64_t timestamp = ctx->tsc;
+ uint64_t timestamp = ctx_private->tsc;
bt_bitfield_write(&id, uint8_t,
0,
31);
lib_ring_buffer_write(config, ctx, &id, sizeof(id));
/* Align extended struct on largest member */
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t));
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint64_t));
lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id));
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t));
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint64_t));
lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp));
}
break;
case 2: /* large */
{
- if (!(ctx->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) {
- uint32_t timestamp = (uint32_t) ctx->tsc;
+ if (!(ctx_private->rflags & (RING_BUFFER_RFLAG_FULL_TSC | LTTNG_RFLAG_EXTENDED))) {
+ uint32_t timestamp = (uint32_t) ctx_private->tsc;
uint16_t id = event_id;
lib_ring_buffer_write(config, ctx, &id, sizeof(id));
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint32_t));
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint32_t));
lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp));
} else {
uint16_t id = 65535;
- uint64_t timestamp = ctx->tsc;
+ uint64_t timestamp = ctx_private->tsc;
lib_ring_buffer_write(config, ctx, &id, sizeof(id));
/* Align extended struct on largest member */
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t));
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint64_t));
lib_ring_buffer_write(config, ctx, &event_id, sizeof(event_id));
- lib_ring_buffer_align_ctx(ctx, lttng_alignof(uint64_t));
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, lttng_ust_rb_alignof(uint64_t));
lib_ring_buffer_write(config, ctx, ×tamp, sizeof(timestamp));
}
break;
}
ctx_record(ctx, lttng_chan, client_ctx->chan_ctx, APP_CTX_ENABLED);
ctx_record(ctx, lttng_chan, client_ctx->event_ctx, APP_CTX_ENABLED);
- lib_ring_buffer_align_ctx(ctx, ctx->largest_align);
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, ctx->largest_align);
}
static const struct lttng_ust_lib_ring_buffer_config client_config;
}
static int client_timestamp_begin(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *timestamp_begin)
{
+ struct lttng_ust_shm_handle *handle = chan->handle;
struct packet_header *header;
header = client_packet_header(buf, handle);
}
static int client_timestamp_end(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *timestamp_end)
{
+ struct lttng_ust_shm_handle *handle = chan->handle;
struct packet_header *header;
header = client_packet_header(buf, handle);
}
static int client_events_discarded(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *events_discarded)
{
+ struct lttng_ust_shm_handle *handle = chan->handle;
struct packet_header *header;
header = client_packet_header(buf, handle);
}
static int client_content_size(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *content_size)
{
+ struct lttng_ust_shm_handle *handle = chan->handle;
struct packet_header *header;
header = client_packet_header(buf, handle);
}
static int client_packet_size(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *packet_size)
{
+ struct lttng_ust_shm_handle *handle = chan->handle;
struct packet_header *header;
header = client_packet_header(buf, handle);
}
static int client_stream_id(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *stream_id)
{
- struct lttng_ust_lib_ring_buffer_channel *chan = shmp(handle,
- buf->backend.chan);
struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(chan);
*stream_id = lttng_chan->priv->id;
}
static int client_current_timestamp(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *ts)
{
- struct lttng_ust_lib_ring_buffer_channel *chan;
-
- chan = shmp(handle, handle->chan);
*ts = client_ring_buffer_clock_read(chan);
return 0;
}
static int client_sequence_number(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *seq)
{
+ struct lttng_ust_shm_handle *handle = chan->handle;
struct packet_header *header;
header = client_packet_header(buf, handle);
}
static int client_instance_id(struct lttng_ust_lib_ring_buffer *buf,
- struct lttng_ust_shm_handle *handle,
+ struct lttng_ust_lib_ring_buffer_channel *chan,
uint64_t *id)
{
*id = buf->backend.cpu;
stream_fds, nr_stream_fds, blocking_timeout);
if (!handle)
goto error;
- lttng_chan_buf->chan = shmp(handle, handle->chan);
+ lttng_chan_buf->priv->rb_chan = shmp(handle, handle->chan);
return lttng_chan_buf;
error:
static
void lttng_channel_destroy(struct lttng_ust_channel_buffer *lttng_chan_buf)
{
- channel_destroy(lttng_chan_buf->chan, lttng_chan_buf->chan->handle, 1);
+ channel_destroy(lttng_chan_buf->priv->rb_chan, lttng_chan_buf->priv->rb_chan->handle, 1);
lttng_ust_free_channel_common(lttng_chan_buf->parent);
}
static
-int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx,
- uint32_t event_id)
+int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx)
{
- struct lttng_ust_channel_buffer *lttng_chan = channel_get_private(ctx->chan);
- struct lttng_ust_stack_ctx *lttng_ctx = ctx->priv;
- struct lttng_ust_event_recorder *event_recorder = lttng_ctx->event_recorder;
+ struct lttng_ust_event_recorder *event_recorder = ctx->client_priv;
+ struct lttng_ust_channel_buffer *lttng_chan = event_recorder->chan;
struct lttng_client_ctx client_ctx;
- int ret;
+ int ret, nesting;
+ struct lttng_ust_lib_ring_buffer_ctx_private *private_ctx;
+ uint32_t event_id;
+ event_id = event_recorder->priv->id;
client_ctx.chan_ctx = lttng_ust_rcu_dereference(lttng_chan->priv->ctx);
client_ctx.event_ctx = lttng_ust_rcu_dereference(event_recorder->priv->ctx);
/* Compute internal size of context structures. */
ctx_get_struct_size(client_ctx.event_ctx, &client_ctx.event_context_len,
APP_CTX_ENABLED);
- if (lib_ring_buffer_nesting_inc(&client_config) < 0)
+ nesting = lib_ring_buffer_nesting_inc(&client_config);
+ if (nesting < 0)
return -EPERM;
+ private_ctx = &URCU_TLS(private_ctx_stack)[nesting];
+ memset(private_ctx, 0, sizeof(*private_ctx));
+ private_ctx->pub = ctx;
+ private_ctx->chan = lttng_chan->priv->rb_chan;
+
+ ctx->priv = private_ctx;
+
switch (lttng_chan->priv->header_type) {
case 1: /* compact */
if (event_id > 30)
- ctx->rflags |= LTTNG_RFLAG_EXTENDED;
+ private_ctx->rflags |= LTTNG_RFLAG_EXTENDED;
break;
case 2: /* large */
if (event_id > 65534)
- ctx->rflags |= LTTNG_RFLAG_EXTENDED;
+ private_ctx->rflags |= LTTNG_RFLAG_EXTENDED;
break;
default:
WARN_ON_ONCE(1);
if (caa_unlikely(ret))
goto put;
if (lib_ring_buffer_backend_get_pages(&client_config, ctx,
- &ctx->backend_pages)) {
+ &private_ctx->backend_pages)) {
ret = -EPERM;
goto put;
}
}
static
-void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *src,
- size_t len)
+void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx,
+ const void *src, size_t len, size_t alignment)
{
+ lttng_ust_lib_ring_buffer_align_ctx(ctx, alignment);
lib_ring_buffer_write(&client_config, ctx, src, len);
}
static
-void lttng_event_strcpy(struct lttng_ust_lib_ring_buffer_ctx *ctx, const char *src,
- size_t len)
+void lttng_event_strcpy(struct lttng_ust_lib_ring_buffer_ctx *ctx,
+ const char *src, size_t len)
{
lib_ring_buffer_strcpy(&client_config, ctx, src, len, '#');
}
static
void lttng_event_pstrcpy_pad(struct lttng_ust_lib_ring_buffer_ctx *ctx,
- const char *src, size_t len)
+ const char *src, size_t len)
{
lib_ring_buffer_pstrcpy(&client_config, ctx, src, len, '\0');
}
-#if 0
static
-wait_queue_head_t *lttng_get_reader_wait_queue(struct lttng_ust_lib_ring_buffer_channel *chan)
+int lttng_is_finalized(struct lttng_ust_channel_buffer *chan)
{
- return &chan->read_wait;
-}
+ struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan;
-static
-wait_queue_head_t *lttng_get_hp_wait_queue(struct lttng_ust_lib_ring_buffer_channel *chan)
-{
- return &chan->hp_wait;
+ return lib_ring_buffer_channel_is_finalized(rb_chan);
}
-#endif //0
static
-int lttng_is_finalized(struct lttng_ust_lib_ring_buffer_channel *chan)
+int lttng_is_disabled(struct lttng_ust_channel_buffer *chan)
{
- return lib_ring_buffer_channel_is_finalized(chan);
-}
+ struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan;
-static
-int lttng_is_disabled(struct lttng_ust_lib_ring_buffer_channel *chan)
-{
- return lib_ring_buffer_channel_is_disabled(chan);
+ return lib_ring_buffer_channel_is_disabled(rb_chan);
}
static
-int lttng_flush_buffer(struct lttng_ust_lib_ring_buffer_channel *chan,
- struct lttng_ust_shm_handle *handle)
+int lttng_flush_buffer(struct lttng_ust_channel_buffer *chan)
{
+ struct lttng_ust_lib_ring_buffer_channel *rb_chan = chan->priv->rb_chan;
struct lttng_ust_lib_ring_buffer *buf;
int cpu;
- for_each_channel_cpu(cpu, chan) {
+ for_each_channel_cpu(cpu, rb_chan) {
int shm_fd, wait_fd, wakeup_fd;
uint64_t memory_map_size;
- buf = channel_get_ring_buffer(&client_config, chan,
- cpu, handle, &shm_fd, &wait_fd,
+ buf = channel_get_ring_buffer(&client_config, rb_chan,
+ cpu, rb_chan->handle, &shm_fd, &wait_fd,
&wakeup_fd, &memory_map_size);
lib_ring_buffer_switch(&client_config, buf,
- SWITCH_ACTIVE, handle);
+ SWITCH_ACTIVE, rb_chan->handle);
}
return 0;
}
projects / lttng-ust.git / blobdiff