clock: read bootid as clock monotonic ID

[lttng-modules.git] / wrapper / poll.h

diff --git a/wrapper/poll.h b/wrapper/poll.h
index 416ce5740da7a6e15b88401e209c49dc54860310..540be3153a5de22ab7a06d5e2f86d7e39f4f0bc4 100644 (file)
--- a/wrapper/poll.h
+++ b/wrapper/poll.h
@@ -1,20 +1,19 @@
+#ifndef _LTTNG_WRAPPER_POLL_H
+#define _LTTNG_WRAPPER_POLL_H
+
 /*
- * wrapper/poll.h
- *
- * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
  *
  * Dual LGPL v2.1/GPL v2 license.
  */
 
-#ifndef CONFIG_LIB_RING_BUFFER
 #include <linux/poll.h>
 
-#warning "poll_wait_set_exclusive() is defined as no-op. Will increase LTTng overhead. Please consider using the LTTng kernel tree for better results."
-
 /*
- * Will cause higher overhead when signalling all possible reader threads when a
- * buffer is ready to be consumed.
+ * Note: poll_wait_set_exclusive() is defined as no-op. Thundering herd
+ * effect can be noticed with large number of consumer threads.
  */
+
 #define poll_wait_set_exclusive(poll_table)
 
-#endif
+#endif /* _LTTNG_WRAPPER_POLL_H */