process 0 ("swapper")

[Kevin Wilson]

Hi,
I see that the idle process (process 0) , is called "swapper".


init_idle() in kernel/sched/core.c:
...
#if defined(CONFIG_SMP)
	sprintf(idle->comm, "%s/%d", INIT_TASK_COMM, cpu);
#endif
...
#define INIT_TASK_COMM "swapper" in include/linux/init_task.h

Two questions:
1) why does this  #if defined(CONFIG_SMP) here ? shouldn't we name
   it swapper also in non SMP mode ?

2) Is there a reason that we do not see it with ps aux  (and also not
under proc; there is no /proc/0).
   - 1) no process 0; processes start from "1".
   - 2)  following command gives nothing:
        ps aux | grep  -i swapper


rgs,
Kevin