X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=wrapper%2Fpoll.h;h=540be3153a5de22ab7a06d5e2f86d7e39f4f0bc4;hb=5f5ddf015e2f7aea813b99ef61d80a7af051c5b9;hp=71ebce94bb50218a729aaa8d4391bd1f48789d3c;hpb=f3bc08c50e1b302bceea699027d889fd6d9af525;p=lttng-modules.git

diff --git a/wrapper/poll.h b/wrapper/poll.h
index 71ebce94..540be315 100644
--- a/wrapper/poll.h
+++ b/wrapper/poll.h
@@ -1,12 +1,19 @@
-#ifndef CONFIG_LIB_RING_BUFFER
-#include <linux/poll.h>
+#ifndef _LTTNG_WRAPPER_POLL_H
+#define _LTTNG_WRAPPER_POLL_H
+
+/*
+ * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
 
-#warning "poll_wait_set_exclusive() is defined as no-op. Will increase LTTng overhead. Please consider using the LTTng kernel tree for better results."
+#include <linux/poll.h>
 
 /*
- * 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 */