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 } 22