函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\tsc.c Create Date:2022-07-27 08:46:08
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Scheduler clock - returns current time in nanosec units.

函数原型：u64 native_sched_clock(void)

返回类型：u64

参数：无

212  如果static_branch_likely( & __use_tsc)则
213  tsc_now等于dtsc() - returns the current TSC without ordering constraints* rdtsc() returns the result of RDTSC as a 64-bit integer
216  返回:Accelerators for sched_clock()* convert from cycles(64bits) => nanoseconds (64bits)* basic equation:* ns = cycles / (freq / ns_per_sec)* ns = cycles * (ns_per_sec / freq)* ns = cycles * (10^9 / (cpu_khz * 10^3))* ns = cycles * (10^6 / cpu_khz)
229  返回:The 64-bit value is not atomic - you MUST NOT read it* without sampling the sequence number in jiffies_lock.* get_jiffies_64() will do this for you as appropriate.减Have the 32 bit jiffies value wrap 5 minutes after boot* so jiffies wrap bugs show up earlier.的差乘1000000000除HZ