参考资料
[/proc官方手册] http://man7.org/linux/man-pages/man5/proc.5.html
[解读/proc/$PID/status中各种参数] https://my.oschina.net/aiguozhe/blog/125477
[查看Linux & Android中内存占用方法] http://blog.csdn.net/myarrow/article/details/7703296
[Measuring Memory Usage] http://locklessinc.com/articles/memory_usage/
[Linux下的/proc/[pid]目录下的文件分析] https://github.com/NanXiao/gnu-linux-proc-pid-intro
[Linux中查看进程占用内存的情况] http://hutaow.com/blog/2014/08/28/display-process-memory-in-linux/
[内存 /proc/meminfo 之谜]http://linuxperf.com/?p=142
