Linux 内核时钟之进程时间更新

/* * Called from the timer interrupt handler to charge one tick to the current * process.  user_tick is 1 if the tick is user time, 0 for system. */void update_process_times(int user_tick){ struct task_struct *p = current;
 /* Note: this timer irq context must be accounted for as well. */ account_process_tick(p, user_tick); run_local_timers(); rcu_check_callbacks(user_tick);#ifdef CONFIG_IRQ_WORK if (in_irq())  irq_work_tick();#endif scheduler_tick(); run_posix_cpu_timers(p);}