Use 3.17 ktime_get_mono_fast_ns() new API

[lttng-modules.git] / wrapper / trace-clock.c

diff --git a/wrapper/trace-clock.c b/wrapper/trace-clock.c
new file mode 100644 (file)
index 0000000..1b7a217
--- /dev/null
+++ b/wrapper/trace-clock.c
@@ -0,0 +1,29 @@
+/*
+ * wrapper/trace-clock.c
+ *
+ * Contains LTTng trace clock mapping to LTTng trace clock or mainline monotonic
+ * clock. This wrapper depends on CONFIG_HIGH_RES_TIMERS=y.
+ *
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "trace-clock.h"
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0))
+DEFINE_PER_CPU(local_t, lttng_last_tsc);
+EXPORT_PER_CPU_SYMBOL(lttng_last_tsc);
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */