Added timer data flushing and overwrite handling to the ring_buffer transport.

* buildrun.cxx (compile_pass): Checks for ring_buffer api change.
* runtime/autoconf-ring_buffer-flags.c: New file.
* runtime/transport/ring_buffer.c (tracing_wait_pipe): No longer
  schedules, just returns.  The timer function will handle it later.
  (_stp_data_write_reserve): Handles ring_buffer api change.  Added
  overwrite processing.  If we're full, delete an event to make room.
  (_stp_data_write_commit): Handles ring_buffer api change.
  (__stp_relay_wakeup_timer): New function.
  (__stp_relay_timer_start): Ditto.
  (__stp_relay_timer_stop): Ditto.
  (_stp_transport_data_fs_start): Calls __stp_relay_timer_start().
  (_stp_transport_data_fs_stop): Calls __stp_relay_timer_stop().
  (_stp_transport_data_fs_overwrite): Sets overwrite flag.

1 files changed, 6 insertions, 0 deletions

diff --git a/runtime/autoconf-ring_buffer-flags.c b/runtime/autoconf-ring_buffer-flags.c
new file mode 100644
index 00000000..7d7b8df0
--- /dev/null
+++ b/runtime/autoconf-ring_buffer-flags.c
@@ -0,0 +1,6 @@
+#include <linux/ring_buffer.h>
+
+void ___autoconf_func(void)
+{
+    (void)ring_buffer_lock_reserve(NULL, 0, 0);
+}