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Update 计算机操作系统 - 概述.md

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重新绘制配图。
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CyC2018
2026-10-26 22:04:13 +08:00
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commit 0a3fae9f5b
5 changed files with 134 additions and 2 deletions
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notes/pics/os-kernels.png
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notes/计算机操作系统 - 概述.md
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如果一个进程在用户态需要使用内核态的功能，就进行系统调用从而陷入内核，由操作系统代为完成。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/tGPV0.png" width="600"/> </div><br>
<div align="center"> <img src="pics/os-syscall.png" width="740px"/> </div><br>
Linux 的系统调用主要有以下这些：
@@ -107,7 +107,7 @@ Linux 的系统调用主要有以下这些：
因为需要频繁地在用户态和核心态之间进行切换，所以会有一定的性能损失。
<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/2_14_microkernelArchitecture.jpg"/> </div><br>
<div align="center"> <img src="pics/os-kernels.png" width="760px"/> </div><br>
## 中断分类
tools/diagram/src/os-kernels.svg
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<text x="380" y="28" class="title">宏内核与微内核</text>
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tools/diagram/src/os-syscall.svg
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<text x="420" y="222" class="c sub">按系统调用号查找</text>
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<text x="632" y="140" class="sub">返回文件描述符</text>
<text x="30" y="290" class="sub">进入内核时 CPU 切换到特权级，执行完再切回用户态。这一来一回比普通函数调用慢得多，所以频繁的小读写要用缓冲区合并。</text>
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