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 #include <asm/trace_clock.h> 16 17 extern u64 notrace trace_clock_local(void); 18 extern u64 notrace trace_clock(void); 19 extern u64 notrace trace_clock_jiffies(void); 20 extern u64 notrace trace_clock_global(void); 21 extern u64 notrace trace_clock_counter(void); 22 23 #endif /* _LINUX_TRACE_CLOCK_H */ 24