问题引入:
https://www.zhihu.com/question/21771664
解答:
https://www.zhihu.com/question/20728404/answer/15984205
相关,Should we disable linux swap?
https://www.jianshu.com/p/bdb5c5c3d7b1
理解虚拟内存机制
https://blog.csdn.net/FreeeLinux/article/details/53783039
共享内存