| David Sharp | 8cbd9cc | 2012-11-13 12:18:21 -0800 | [diff] [blame] | 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 | } | ||||