release/src-rt-6.x.4708/linux/linux-2.6.36/include/linux/trace_clock.h

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