Implement libcounter

[lttng-ust.git] / include / lttng / ust-events.h

diff --git a/include/lttng/ust-events.h b/include/lttng/ust-events.h
index 44b8d4c4878819d57b2a13b7130e9c28862540d7..721b0aed7ec57024a14b047ca291f89732b8e480 100644 (file)
--- a/include/lttng/ust-events.h
+++ b/include/lttng/ust-events.h
@@ -64,6 +64,7 @@ struct lttng_session;
 struct lttng_ust_lib_ring_buffer_ctx;
 struct lttng_ust_context_app;
 struct lttng_event_field;
+struct lttng_event_notifier_group;
 
 /*
  * Data structures used by tracepoint event declarations, and by the
@@ -616,6 +617,36 @@ struct lttng_channel {
        int tstate:1;                   /* Transient enable state */
 };
 
+#define LTTNG_COUNTER_DIMENSION_MAX    8
+
+struct lttng_counter_dimension {
+       uint64_t size;
+       uint64_t underflow_index;
+       uint64_t overflow_index;
+       uint8_t has_underflow;
+       uint8_t has_overflow;
+};
+
+struct lttng_counter_ops {
+       struct lib_counter *(*counter_create)(size_t nr_dimensions,
+                       const struct lttng_counter_dimension *dimensions,
+                       int64_t global_sum_step,
+                       int global_counter_fd,
+                       int nr_counter_cpu_fds,
+                       const int *counter_cpu_fds,
+                       bool is_daemon);
+       void (*counter_destroy)(struct lib_counter *counter);
+       int (*counter_add)(struct lib_counter *counter,
+                       const size_t *dimension_indexes, int64_t v);
+       int (*counter_read)(struct lib_counter *counter,
+                       const size_t *dimension_indexes, int cpu,
+                       int64_t *value, bool *overflow, bool *underflow);
+       int (*counter_aggregate)(struct lib_counter *counter,
+                       const size_t *dimension_indexes, int64_t *value,
+                       bool *overflow, bool *underflow);
+       int (*counter_clear)(struct lib_counter *counter, const size_t *dimension_indexes);
+};
+
 #define LTTNG_UST_STACK_CTX_PADDING    32
 struct lttng_stack_ctx {
        struct lttng_event *event;
@@ -677,6 +708,14 @@ struct lttng_session {
        struct lttng_ctx *ctx;                  /* contexts for filters. */
 };
 
+struct lttng_counter {
+       int objd;
+       struct lttng_event_notifier_group *event_notifier_group;    /* owner */
+       struct lttng_counter_transport *transport;
+       struct lib_counter *counter;
+       struct lttng_counter_ops *ops;
+};
+
 struct lttng_event_notifier_group {
        int objd;
        void *owner;
@@ -686,6 +725,9 @@ struct lttng_event_notifier_group {
        struct cds_list_head event_notifiers_head;      /* list of event_notifiers */
        struct lttng_ust_event_notifier_ht event_notifiers_ht; /* hashtable of event_notifiers */
        struct lttng_ctx *ctx;                  /* contexts for filters. */
+
+       struct lttng_counter *error_counter;
+       size_t error_counter_len;
 };
 
 struct lttng_transport {
@@ -695,6 +737,13 @@ struct lttng_transport {
        const struct lttng_ust_lib_ring_buffer_config *client_config;
 };
 
+struct lttng_counter_transport {
+       char *name;
+       struct cds_list_head node;
+       struct lttng_counter_ops ops;
+       const struct lib_counter_config *client_config;
+};
+
 struct lttng_session *lttng_session_create(void);
 int lttng_session_enable(struct lttng_session *session);
 int lttng_session_disable(struct lttng_session *session);
@@ -724,6 +773,13 @@ int lttng_attach_context(struct lttng_ust_context *context_param,
 void lttng_transport_register(struct lttng_transport *transport);
 void lttng_transport_unregister(struct lttng_transport *transport);
 
+void lttng_counter_transport_register(struct lttng_counter_transport *transport);
+void lttng_counter_transport_unregister(struct lttng_counter_transport *transport);
+
+struct lttng_counter *lttng_ust_counter_create(
+               const char *counter_transport_name,
+               size_t number_dimensions, const struct lttng_counter_dimension *dimensions);
+
 void synchronize_trace(void);
 
 int lttng_probe_register(struct lttng_probe_desc *desc);
@@ -810,6 +866,7 @@ extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_cal
 extern const struct lttng_ust_client_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
 
 struct lttng_transport *lttng_transport_find(const char *name);
+struct lttng_counter_transport *lttng_counter_transport_find(const char *name);
 
 int lttng_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
 void lttng_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);