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update_process_times��
          if (p->counter < 0) {
   p->counter = 0;
   p->need_resched = 1;
  }
          if (p->priority < DEF_PRIORITY)
   kstat.cpu_nice += user;
  else
   kstat.cpu_user += user;
  kstat.cpu_system += system;
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cess����
���õ�do_process_times��ʲô���� ,����Ҳ���ж���ʱ����SIGXCPU��ʱ�ź�
static inline void do_process_times(struct task_struct *p,
 unsigned long user, unsigned long system)
{
 long psecs;
 psecs = (p->times.tms_utime += user);
 psecs += (p->times.tms_stime += system);
 if (psecs / HZ > p->rlim[RLIMIT_CPU].rlim_cur) { //����ж������õ�??
  /* Send SIGXCPU every second.. */
  if (!(psecs % HZ))
   send_sig(SIGXCPU, p, 1);
  /* and SIGKILL when we go over max.. */
  if (psecs / HZ > p->rlim[RLIMIT_CPU].rlim_max)
   send_sig(SIGKILL, p, 1);
 }
}
--

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