Cleanup: Move instrumentation/ headers to include/instrumentation/

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

diff --git a/wrapper/poll.h b/wrapper/poll.h
index 416ce5740da7a6e15b88401e209c49dc54860310..a97bb6b81fa105d9d02fadcd7cea92976fc3c6e7 100644 (file)
--- a/wrapper/poll.h
+++ b/wrapper/poll.h
@@ -1,20 +1,20 @@
-/*
- * wrapper/poll.h
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
  *
- * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * wrapper/poll.h
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  */
 
-#ifndef CONFIG_LIB_RING_BUFFER
-#include <linux/poll.h>
+#ifndef _LTTNG_WRAPPER_POLL_H
+#define _LTTNG_WRAPPER_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."
+#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 */