Linux proc目录详解 https://blog.csdn.net/qq_25518029/article/details/120033975
通过PROC文件收集进程信息 https://blog.csdn.net/sinat_34467747/article/details/78930918
/sys目录下各个子目录的具体说明
https://blog.csdn.net/kwame211/article/details/81045382
https://blog.csdn.net/kwame211/article/details/81045382