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Update p4-linux-cfs-sched.md
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lec8/p4-linux-cfs-sched.md

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#### CFS的背景
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<!-- 万字长文,锤它!揭秘Linux进程调度器 https://www.eet-china.com/mp/a111242.html -->
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- O(1)和O(n)都将CPU资源划分为时间片
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- 采用固定额度分配机制,每个调度周期的进程可用时间片是确定的
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- 采用**固定额度**分配机制,每个调度周期的进程可用时间片是确定的
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- 调度周期结束被重新分配
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- O(1)调度器本质上是MLFQ(multi-level feedback queue)算法思想
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- 不足:O(1)调度器对进程交互性的响应不及时

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