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title: Virtual Memory and Linux
description:
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# Virtual Memory and Linux
###### tags: `Interview`
> [intro_virtual memory](https://elinux.org/images/b/b0/Introduction_to_Memory_Management_in_Linux.pdf)

## Virtual Memory 優點
* 每個process可以有自己的`memory space`.
* Process之間是隔離的.
* Built-in memory proctection.
* User是無法碰觸到`kernel space`的
* Memory可以被移動 (以page為單位)
* 可以被`swap`到`disk`
* 實體記憶體可以被`mapping`到多個`process`
* Shared memory
* `Memory regions`可以有`access permisions`
* Read, write, execute