Add channel output method selection

[lttng-tools.git] / include / lttng / lttng.h

diff --git a/include/lttng/lttng.h b/include/lttng/lttng.h
index a8b7ac09a37351b307dc87714693217698b3a8d3..c04d1b4eadb7d996b752570c85d406544ac0f290 100644 (file)
--- a/include/lttng/lttng.h
+++ b/include/lttng/lttng.h
@@ -44,6 +44,43 @@ enum lttng_event_type {
        LTTNG_EVENT_FUNCTION,
 };
 
+/* Kernel context possible type */
+enum lttng_kernel_context_type {
+       LTTNG_KERNEL_CONTEXT_PID                = 0,
+       LTTNG_KERNEL_CONTEXT_PERF_COUNTER       = 1,
+       LTTNG_KERNEL_CONTEXT_COMM               = 2,
+       LTTNG_KERNEL_CONTEXT_PRIO               = 3,
+       LTTNG_KERNEL_CONTEXT_NICE               = 4,
+       LTTNG_KERNEL_CONTEXT_VPID               = 5,
+       LTTNG_KERNEL_CONTEXT_TID                = 6,
+       LTTNG_KERNEL_CONTEXT_VTID               = 7,
+       LTTNG_KERNEL_CONTEXT_PPID               = 8,
+       LTTNG_KERNEL_CONTEXT_VPPID              = 9,
+};
+
+/* Perf counter attributes */
+struct lttng_kernel_perf_counter_ctx {
+       uint32_t type;
+       uint64_t config;
+       char name[LTTNG_SYMBOL_NAME_LEN];
+};
+
+/* Event/Channel context */
+struct lttng_kernel_context {
+       enum lttng_kernel_context_type ctx;
+       union {
+               struct lttng_kernel_perf_counter_ctx perf_counter;
+       } u;
+};
+
+/*
+ * LTTng consumer mode
+ */
+enum lttng_kernel_output {
+       LTTNG_KERNEL_SPLICE       = 0,
+       LTTNG_KERNEL_MMAP         = 1,
+};
+
 /*
  * Either addr is used or symbol_name and offset.
  */
@@ -81,6 +118,7 @@ struct lttng_channel_attr {
        uint64_t num_subbuf;                       /* power of 2 */
        unsigned int switch_timer_interval;   /* usec */
        unsigned int read_timer_interval;     /* usec */
+       enum lttng_kernel_output output;        /* splice, mmap */
 };
 
 /*
@@ -129,6 +167,9 @@ extern int lttng_stop_tracing(char *session_name);
 /*
  * LTTng Kernel tracer control
  */
+extern int lttng_kernel_add_context(struct lttng_kernel_context *ctx,
+               char *event_name, char *channel_name);
+
 extern int lttng_kernel_create_channel(struct lttng_channel *chan);
 
 extern int lttng_kernel_enable_event(struct lttng_event *ev, char *channel_name);