include/linux/trace_clock.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_TRACE_CLOCK_H
   3 #define _LINUX_TRACE_CLOCK_H
   4
   5 /*
   6  * 3 trace clock variants, with differing scalability/precision
   7  * tradeoffs:
   8  *
   9  *  -   local: CPU-local trace clock
  10  *  -  medium: scalable global clock with some jitter
  11  *  -  global: globally monotonic, serialized clock
  12  */
  13 #include <linux/compiler.h>
  14 #include <linux/types.h>
  15
  16 #include <asm/trace_clock.h>
  17
  18 extern u64 notrace trace_clock_local(void);
  19 extern u64 notrace trace_clock(void);
  20 extern u64 notrace trace_clock_jiffies(void);
  21 extern u64 notrace trace_clock_global(void);
  22 extern u64 notrace trace_clock_counter(void);
  23
  24 #endif /* _LINUX_TRACE_CLOCK_H */