在配置IDS内存时，我们需要考虑总的可用内存，包括物理ram、虚拟内存和系统上的日常负载。
When configuring IDS memory, we need to consider the total available memory, both physical RAM and virtual memory and daily load on the system.
Linux包括了管理可用内存的方式，以及物理和虚拟映射所使用的硬件机制。
Linux includes the means to manage the available memory, as well as the hardware mechanisms for physical and virtual mappings.
可用内存包含不同VM对象联系在一起任何地址空间物理内存的页。
The free list contains pages of physical memory that are not associated with any address space of VM object.
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