当我运行命令：时cat /proc/$pid/stat，它返回如下字符串：
类型 1：
11473 (abc) R 11471 8438 8438 0 -1 4194304 113 0 0 0 0 0 0 0 20 0 1 0 740394567 13586432 387 18446744073709551615 4194304 4196636 140722465367280 140722465367056 4196041 0 0 16781312 0 0 0 0 17 3 0 0 0 0 0 6295032 6295624 20967424 140722465373721 140722465373798 140722465373798 140722465374123 0
类型 2：
> cpu 127932322 24371 17881916 2752559374 40433812 0 3629274 0 0 0
> cpu0 32078308 6691 4511623 689457980 9977449 0 62831 0 0 0
> cpu1 27945507 6745 4406054 689058150 9368678 0 3467446 0 0 0
> cpu2 34006589 5454 4469269 687604758 9965399 0 45624 0 0 0
> cpu3 33901916 5480 4494969 686438485 11122284 0 53371 0 0 0
> intr 10585846379 50 9 0 0 0 0 4 0 0 0 0 0 16 0 0 7230416 0 46894546 1845392925 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0
> ctxt 17568581605 btime 1481551477 processes 7067938
> procs_running 1
> procs_blocked 0
> softirq 7511130737 0 2303767815 1777050 1864188938 50494012 0 157806217 1205606999 0 1927489706
我的问题是：为什么文件/proc/pid/stat有两种类型。类型 2 是什么意思。