《Operating System Concepts》阅读笔记：p76-p86

《Operating System Concepts》学习第 11 天，p76-p86 总结，总计 11 页。

一、技术总结

1.mechanism & policy

(1)mechanisim 定义

An operation that defi nes how something will be done.

(2)policy 定义

A rule that defi nes what will be done.

(3)mechanism 和 policy 的区别

Mechanisms determine how to do something; policies determine what will be done. For example, the timer construct (see Section 1.4.3) is a mechanism for ensuring CPU protection, but deciding how long the timer is to be set for a particular user is a policy decision.

二、英语总结(生词：3)

1.consensus

(1)consensus: con-(“with, together”) + entire(“to feel, to think”, 参考 sense)

s/u. to think or fell together, reflect agreement or harmony among a group(共识，一致意见).

示例：There is little consensus regarding which services should re