Below the user space is the kernel space. Here, the Linux kernel exists.
用户空间之下是内核空间，Linux内核正是位于这里。
The selector then copies the channels and interested operations into the kernel space and let the kernel do the actual polling for the application.
然后，选择器把通道和感兴趣的操作复制到内核空间，让内核为这个应用程序执行实际的poll。
System calls are an efficient way of traversing between user-space and the kernel to request services in the kernel-space.
系统调用是穿越用户空间和内核空间，请求内核空间服务的一种有效方法。
System calls are an efficient way of traversing between user-space and the kernel to request services in the kernel-space.
系统调用是穿越用户空间和内核空间，请求内核空间服务的一种有效方法。
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