"An interprocess communication (IPC) mechanism is built into the system, and the various servers communicate and invoke "services" from each other by sending messages over the IPC mechanism. 互换“服务”"
"主板本号"
"Minor version is 6 (this is a stable kernel)"
"kernel Core subsystems, such as the scheduler 像调度程序那样的核心子系统"
"当一个程序调执行了系统调用(参见第5章)"
"current宏"
"It then checks that the new child will not exceed the resource limits on the number of processes for the current user."