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-rw-r--r--kernel/include/linux/trace_clock.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/include/linux/trace_clock.h b/kernel/include/linux/trace_clock.h
new file mode 100644
index 000000000..1d7ca2739
--- /dev/null
+++ b/kernel/include/linux/trace_clock.h
@@ -0,0 +1,23 @@
+#ifndef _LINUX_TRACE_CLOCK_H
+#define _LINUX_TRACE_CLOCK_H
+
+/*
+ * 3 trace clock variants, with differing scalability/precision
+ * tradeoffs:
+ *
+ * - local: CPU-local trace clock
+ * - medium: scalable global clock with some jitter
+ * - global: globally monotonic, serialized clock
+ */
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+#include <asm/trace_clock.h>
+
+extern u64 notrace trace_clock_local(void);
+extern u64 notrace trace_clock(void);
+extern u64 notrace trace_clock_jiffies(void);
+extern u64 notrace trace_clock_global(void);
+extern u64 notrace trace_clock_counter(void);
+
+#endif /* _LINUX_TRACE_CLOCK_H */