面向服务的体系架构灵活性(这样服务可以快速地换入换出)的代价是组织并控制业务活动的额外费用。
The price for the flexibility of a service-oriented architecture, where services can be swapped in or out rapidly, is a premium on organizing and controlling business activities.
交换列中较高的数值表示存在许多进程使用了太多的内存，需要对它们进行换入和换出。
High Numbers in the swapped column indicate that there are two many processes using too much memory that need to be swapped in and out.
当内核将一个分页换出、然后再将其换入的时候，通常表示这个分页经常会被使用，并且该分页应该保留在内存中。
When the kernel pages a page out and then pages it back in, it usually indicates that there is strong demand for the page and that the page should stay in memory.
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