Step four: the write system call returns, creating our fourth context switch.
步骤四：系统调用返回，导致了第4次上下文切换。
Whenever you switch activities, write down the time and the new activity.
自己每要另起干一件事，把时间和新项目都记下来。
Finally, save the switch configuration, by entering write mem.
最后，输入writemem保存交换机配置。
Whenever I need to write an email or make notes I can just switch back.
每当我需要写一封电子邮件或做笔记，我就可以切换回来。
Whenever I need to write an email or make notes I can just switch back.
每当我需要写一封电子邮件或做笔记，我就可以切换回来。
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