X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-ring-buffer-client.h;h=2f67799e19feb676cb0da2b9eef26e5f74a2c0a3;hb=e56bb47c3af00db3bc9e2dea711bef4882e6ef4c;hp=d219b79c91dfb0ea45658865a97b0dded461ac20;hpb=53569322d40ed45abe0368ddb08eb4a2738afc37;p=lttng-ust.git diff --git a/liblttng-ust/lttng-ring-buffer-client.h b/liblttng-ust/lttng-ring-buffer-client.h index d219b79c..2f67799e 100644 --- a/liblttng-ust/lttng-ring-buffer-client.h +++ b/liblttng-ust/lttng-ring-buffer-client.h @@ -30,6 +30,11 @@ #define LTTNG_COMPACT_EVENT_BITS 5 #define LTTNG_COMPACT_TSC_BITS 27 +enum app_ctx_mode { + APP_CTX_DISABLED, + APP_CTX_ENABLED, +}; + /* * Keep the natural field alignment for _each field_ within this structure if * you ever add/remove a field from this header. Packed attribute is not used @@ -45,6 +50,7 @@ struct packet_header { */ uint8_t uuid[LTTNG_UST_UUID_LEN]; uint32_t stream_id; + uint64_t stream_instance_id; struct { /* Stream packet context */ @@ -52,6 +58,7 @@ struct packet_header { uint64_t timestamp_end; /* Cycle count at subbuffer end */ uint64_t content_size; /* Size of data in subbuffer */ uint64_t packet_size; /* Subbuffer size (include padding) */ + uint64_t packet_seq_num; /* Packet sequence number */ unsigned long events_discarded; /* * Events lost in this subbuffer since * the beginning of the trace. @@ -62,6 +69,10 @@ struct packet_header { } ctx; }; +struct lttng_client_ctx { + size_t packet_context_len; + size_t event_context_len; +}; static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan) { @@ -69,31 +80,85 @@ static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan) } static inline -size_t ctx_get_size(size_t offset, struct lttng_ctx *ctx) +size_t ctx_get_aligned_size(size_t offset, struct lttng_ctx *ctx, + size_t ctx_len) { - int i; size_t orig_offset = offset; if (caa_likely(!ctx)) return 0; offset += lib_ring_buffer_align(offset, ctx->largest_align); - for (i = 0; i < ctx->nr_fields; i++) - offset += ctx->fields[i].get_size(&ctx->fields[i], offset); + offset += ctx_len; return offset - orig_offset; } +static inline +void ctx_get_struct_size(struct lttng_ctx *ctx, size_t *ctx_len, + enum app_ctx_mode mode) +{ + int i; + size_t offset = 0; + + if (caa_likely(!ctx)) { + *ctx_len = 0; + return; + } + for (i = 0; i < ctx->nr_fields; i++) { + if (mode == APP_CTX_ENABLED) { + offset += ctx->fields[i].get_size(&ctx->fields[i], offset); + } else { + if (lttng_context_is_app(ctx->fields[i].event_field.name)) { + /* + * Before UST 2.8, we cannot use the + * application context, because we + * cannot trust that the handler used + * for get_size is the same used for + * ctx_record, which would result in + * corrupted traces when tracing + * concurrently with application context + * register/unregister. + */ + offset += lttng_ust_dummy_get_size(&ctx->fields[i], offset); + } else { + offset += ctx->fields[i].get_size(&ctx->fields[i], offset); + } + } + } + *ctx_len = offset; +} + static inline void ctx_record(struct lttng_ust_lib_ring_buffer_ctx *bufctx, struct lttng_channel *chan, - struct lttng_ctx *ctx) + struct lttng_ctx *ctx, + enum app_ctx_mode mode) { int i; if (caa_likely(!ctx)) return; lib_ring_buffer_align_ctx(bufctx, ctx->largest_align); - for (i = 0; i < ctx->nr_fields; i++) - ctx->fields[i].record(&ctx->fields[i], bufctx, chan); + for (i = 0; i < ctx->nr_fields; i++) { + if (mode == APP_CTX_ENABLED) { + ctx->fields[i].record(&ctx->fields[i], bufctx, chan); + } else { + if (lttng_context_is_app(ctx->fields[i].event_field.name)) { + /* + * Before UST 2.8, we cannot use the + * application context, because we + * cannot trust that the handler used + * for get_size is the same used for + * ctx_record, which would result in + * corrupted traces when tracing + * concurrently with application context + * register/unregister. + */ + lttng_ust_dummy_record(&ctx->fields[i], bufctx, chan); + } else { + ctx->fields[i].record(&ctx->fields[i], bufctx, chan); + } + } + } } /* @@ -113,10 +178,12 @@ static __inline__ size_t 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) + struct lttng_ust_lib_ring_buffer_ctx *ctx, + struct lttng_client_ctx *client_ctx) { struct lttng_channel *lttng_chan = channel_get_private(chan); struct lttng_event *event = ctx->priv; + struct lttng_stack_ctx *lttng_ctx = ctx->priv2; size_t orig_offset = offset; size_t padding; @@ -155,9 +222,19 @@ size_t record_header_size(const struct lttng_ust_lib_ring_buffer_config *config, padding = 0; WARN_ON_ONCE(1); } - offset += ctx_get_size(offset, event->ctx); - offset += ctx_get_size(offset, lttng_chan->ctx); - + if (lttng_ctx) { + /* 2.8+ probe ABI. */ + offset += ctx_get_aligned_size(offset, lttng_ctx->chan_ctx, + client_ctx->packet_context_len); + offset += ctx_get_aligned_size(offset, lttng_ctx->event_ctx, + client_ctx->event_context_len); + } else { + /* Pre 2.8 probe ABI. */ + offset += ctx_get_aligned_size(offset, lttng_chan->ctx, + client_ctx->packet_context_len); + offset += ctx_get_aligned_size(offset, event->ctx, + client_ctx->event_context_len); + } *pre_header_padding = padding; return offset - orig_offset; } @@ -185,6 +262,7 @@ void lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config *con uint32_t event_id) { struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); + struct lttng_event *event = ctx->priv; struct lttng_stack_ctx *lttng_ctx = ctx->priv2; if (caa_unlikely(ctx->rflags)) @@ -220,8 +298,15 @@ void lttng_write_event_header(const struct lttng_ust_lib_ring_buffer_config *con WARN_ON_ONCE(1); } - ctx_record(ctx, lttng_chan, lttng_ctx->chan_ctx); - ctx_record(ctx, lttng_chan, lttng_ctx->event_ctx); + if (lttng_ctx) { + /* 2.8+ probe ABI. */ + ctx_record(ctx, lttng_chan, lttng_ctx->chan_ctx, APP_CTX_ENABLED); + ctx_record(ctx, lttng_chan, lttng_ctx->event_ctx, APP_CTX_ENABLED); + } else { + /* Pre 2.8 probe ABI. */ + ctx_record(ctx, lttng_chan, lttng_chan->ctx, APP_CTX_DISABLED); + ctx_record(ctx, lttng_chan, event->ctx, APP_CTX_DISABLED); + } lib_ring_buffer_align_ctx(ctx, ctx->largest_align); return; @@ -236,6 +321,7 @@ void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config uint32_t event_id) { struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); + struct lttng_event *event = ctx->priv; struct lttng_stack_ctx *lttng_ctx = ctx->priv2; switch (lttng_chan->header_type) { @@ -293,8 +379,15 @@ void lttng_write_event_header_slow(const struct lttng_ust_lib_ring_buffer_config default: WARN_ON_ONCE(1); } - ctx_record(ctx, lttng_chan, lttng_ctx->chan_ctx); - ctx_record(ctx, lttng_chan, lttng_ctx->event_ctx); + if (lttng_ctx) { + /* 2.8+ probe ABI. */ + ctx_record(ctx, lttng_chan, lttng_ctx->chan_ctx, APP_CTX_ENABLED); + ctx_record(ctx, lttng_chan, lttng_ctx->event_ctx, APP_CTX_ENABLED); + } else { + /* Pre 2.8 probe ABI. */ + ctx_record(ctx, lttng_chan, lttng_chan->ctx, APP_CTX_DISABLED); + ctx_record(ctx, lttng_chan, event->ctx, APP_CTX_DISABLED); + } lib_ring_buffer_align_ctx(ctx, ctx->largest_align); } @@ -309,10 +402,11 @@ 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) + struct lttng_ust_lib_ring_buffer_ctx *ctx, + void *client_ctx) { return record_header_size(config, chan, offset, - pre_header_padding, ctx); + pre_header_padding, ctx, client_ctx); } /** @@ -338,6 +432,7 @@ static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t subbuf_idx * chan->backend.subbuf_size, handle); struct lttng_channel *lttng_chan = channel_get_private(chan); + uint64_t cnt = shmp_index(handle, buf->backend.buf_cnt, subbuf_idx)->seq_cnt; assert(header); if (!header) @@ -345,10 +440,12 @@ static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t header->magic = CTF_MAGIC_NUMBER; memcpy(header->uuid, lttng_chan->uuid, sizeof(lttng_chan->uuid)); header->stream_id = lttng_chan->id; + header->stream_instance_id = buf->backend.cpu; header->ctx.timestamp_begin = tsc; header->ctx.timestamp_end = 0; header->ctx.content_size = ~0ULL; /* for debugging */ header->ctx.packet_size = ~0ULL; + header->ctx.packet_seq_num = chan->backend.num_subbuf * cnt + subbuf_idx; header->ctx.events_discarded = 0; header->ctx.cpu_id = buf->backend.cpu; } @@ -504,6 +601,28 @@ static int client_current_timestamp(struct lttng_ust_lib_ring_buffer *buf, return 0; } +static int client_sequence_number(struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle, + uint64_t *seq) +{ + struct packet_header *header; + + header = client_packet_header(buf, handle); + *seq = header->ctx.packet_seq_num; + return 0; +} + +static int client_instance_id(struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle, + uint64_t *id) +{ + struct packet_header *header; + + header = client_packet_header(buf, handle); + *id = header->stream_instance_id; + return 0; +} + static const struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = { .parent = { @@ -524,6 +643,8 @@ struct lttng_ust_client_lib_ring_buffer_client_cb client_cb = { .packet_size = client_packet_size, .stream_id = client_stream_id, .current_timestamp = client_current_timestamp, + .sequence_number = client_sequence_number, + .instance_id = client_instance_id, }; static const struct lttng_ust_lib_ring_buffer_config client_config = { @@ -597,8 +718,27 @@ int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id) { struct lttng_channel *lttng_chan = channel_get_private(ctx->chan); + struct lttng_event *event = ctx->priv; + struct lttng_stack_ctx *lttng_ctx = ctx->priv2; + struct lttng_client_ctx client_ctx; int ret, cpu; + /* Compute internal size of context structures. */ + + if (lttng_ctx) { + /* 2.8+ probe ABI. */ + ctx_get_struct_size(lttng_ctx->chan_ctx, &client_ctx.packet_context_len, + APP_CTX_ENABLED); + ctx_get_struct_size(lttng_ctx->event_ctx, &client_ctx.event_context_len, + APP_CTX_ENABLED); + } else { + /* Pre 2.8 probe ABI. */ + ctx_get_struct_size(lttng_chan->ctx, &client_ctx.packet_context_len, + APP_CTX_DISABLED); + ctx_get_struct_size(event->ctx, &client_ctx.event_context_len, + APP_CTX_DISABLED); + } + cpu = lib_ring_buffer_get_cpu(&client_config); if (cpu < 0) return -EPERM; @@ -617,9 +757,17 @@ int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, WARN_ON_ONCE(1); } - ret = lib_ring_buffer_reserve(&client_config, ctx); - if (ret) + ret = lib_ring_buffer_reserve(&client_config, ctx, &client_ctx); + if (caa_unlikely(ret)) goto put; + if (caa_likely(ctx->ctx_len + >= sizeof(struct lttng_ust_lib_ring_buffer_ctx))) { + if (lib_ring_buffer_backend_get_pages(&client_config, ctx, + &ctx->backend_pages)) { + ret = -EPERM; + goto put; + } + } lttng_write_event_header(&client_config, ctx, event_id); return 0; put: