linux kerner 獲取當前時間和時間差

 

struct timeval current_time;

struct timeval last_time;

unsigned long distance_time = 0;



do_gettimeofday(&last_time);

//do something

do_gettimeofday(&current_time);




distance_time = (current_time.tv_sec - last_time.tv_sec) * 1000000 +

         (current_time.tv_usec - last_time.tv_usec);