LXR linux/arch/x86/kernel/trace

   1/*
   2 * X86 trace clocks
   3 */
   4#include <asm/trace_clock.h>
   5#include <asm/barrier.h>
   6#include <asm/msr.h>
   7
   8/*
   9 * trace_clock_x86_tsc(): A clock that is just the cycle counter.
  10 *
  11 * Unlike the other clocks, this is not in nanoseconds.
  12 */
  13u64 notrace trace_clock_x86_tsc(void)
  14{
  15        return rdtsc_ordered();
  16}
  17