[deliverable/linux.git] / arch / x86 / kernel / trace_clock.c

/*
 * X86 trace clocks
 */
#include <asm/trace_clock.h>
#include <asm/barrier.h>
#include <asm/msr.h>

/*
 * trace_clock_x86_tsc(): A clock that is just the cycle counter.
 *
 * Unlike the other clocks, this is not in nanoseconds.
 */
u64 notrace trace_clock_x86_tsc(void)
{
	u64 ret;

	rdtsc_barrier();
	rdtscll(ret);

	return ret;
}
Commit	Line	Data
8cbd9cc6 DS	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	*/
	13	u64 notrace trace_clock_x86_tsc(void)
	14	{
	15	u64 ret;
	16
	17	rdtsc_barrier();
	18	rdtscll(ret);
	19
	20	return ret;
	21	}