Implement lib counter

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

diff --git a/include/lttng/events.h b/include/lttng/events.h
index 80de505056fe8a265d06c02f43717c92934fc0ea..7b3b18571184fb0ee1d9717277800d42f20ce06e 100644 (file)
--- a/include/lttng/events.h
+++ b/include/lttng/events.h
@@ -512,6 +512,28 @@ struct lttng_channel_ops {
                        uint64_t *id);
 };
 
+struct lttng_counter_ops {
+       struct lib_counter *(*counter_create)(size_t nr_dimensions,
+                       const size_t *max_nr_elem,      /* for each dimension */
+                       int64_t global_sum_step);
+       void (*counter_destroy)(struct lib_counter *counter);
+       int (*counter_add)(struct lib_counter *counter, const size_t *dimension_indexes,
+                       int64_t v);
+       /*
+        * counter_read reads a specific cpu's counter if @cpu >= 0, or
+        * the global aggregation counter if @cpu == -1.
+        */
+       int (*counter_read)(struct lib_counter *counter, const size_t *dimension_indexes, int cpu,
+                        int64_t *value, bool *overflow, bool *underflow);
+       /*
+        * counter_aggregate returns the total sum of all per-cpu counters and
+        * the global aggregation counter.
+        */
+       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);
+};
+
 struct lttng_transport {
        char *name;
        struct module *owner;
@@ -519,6 +541,13 @@ struct lttng_transport {
        struct lttng_channel_ops ops;
 };
 
+struct lttng_counter_transport {
+       char *name;
+       struct module *owner;
+       struct list_head node;
+       struct lttng_counter_ops ops;
+};
+
 struct lttng_syscall_filter;
 
 #define LTTNG_EVENT_HT_BITS            12
@@ -789,6 +818,9 @@ int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier);
 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);
+
 void synchronize_trace(void);
 int lttng_abi_init(void);
 int lttng_abi_compat_old_init(void);