进程表是由修改过的BSD内核维护的，同样由BSD内核维护的还有文件系统，网络堆栈，UNIX形式的进程间数据交换(IPC)，以及很多其他东西。
The process tables are maintained by the modified FreeBSD kernel, as are the filesystem and network stacks, UNIX-style IPC, and quite a few other things.
同样，系统会经常杀掉这些进程以在空的缓存进程和底层内核缓存之间保持系统资源平衡。
As such, the system will often kill these processes in order to balance overall system resources between these empty cached processes and the underlying kernel caches.
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