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#include <linux/time.h>
unsigned long mktime (unsigned int year, unsigned int mon,
unsigned int day, unsigned int hour,
unsigned int min, unsigned int sec);
#include <linux/time.h>
void do_gettimeofday(struct timeval *tv);
#include <linux/time.h>
struct timespec current_kernel_time(void);
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mktime转换年月日时间到一个 jiffies 值
do_gettimeofday精度接近毫秒的精度，不晚于下一个时钟嘀哒
current_kernel_time精度，虽以纳秒来表示, 只有时钟嘀哒的粒度
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