rdtsc_ordered

函数名称：dtsc_ordered() - read the current TSC in program order* rdtsc_ordered() returns the result of RDTSC as a 64-bit integer.* It is ordered like a load to a global in-memory counter. It should* be impossible to observe non-monotonic rdtsc_unordered() behavior

函数原型：static __always_inline unsigned long long rdtsc_ordered(void)

返回类型：unsigned long long

参数：无

**调用者**
名称	描述
delay_tsc	TSC based delay:
delay_mwaitx	On some AMD platforms, MWAITX has a configurable 32-bit timer, that* counts with TSC frequency. The input value is the loop of the* counter, it will exit when the timer expires.
read_tsc	We used to compare the TSC to the cycle_last value in the clocksource* structure to avoid a nasty time-warp
measure_cycles_lat_fn	measure_cycles_lat_fn - Measure cycle latency to read pseudo-locked memory@_plr: pseudo-lock region to measure There is no deterministic way to test if a memory region is cached. One* way is to measure how long it takes to read the memory, the speed of
trace_clock_x86_tsc	race_clock_x86_tsc(): A clock that is just the cycle counter.* Unlike the other clocks, this is not in nanoseconds.
pvclock_clocksource_read

函数逻辑报告