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llw_blog

追求新兴的软件技术，致力于通信产品的开发实践。

原创 Linux内核0.11

第1章从开机加电到执行main函数之前的过程。第2章设备环境初始化及激活进程0。第3章进程1的创建及执行。第4章进程2的创建及执行。

2023-10-02 16:50:10 108 2

原创嵌入式Linux基础

嵌入式Linux基础。

2023-09-15 02:19:00 84

原创程序4层架构模型

2023-07-15 01:13:57 181

原创 Effective STL .xmind

2023-07-15 01:08:14 91

原创 More Effective C++.xmind

More Effective C++

2023-07-09 13:56:38 91

原创 Effective C++.xmind

Effective C++.xmind

2023-06-29 17:18:12 92

原创深度探索C++对象模型.xmind

C++对象模型。

2023-06-16 12:25:43 131

原创《Qt Creator 快速入门第3版》

2021-03-22 00:20:39 389

原创 Protobuf架构和性能提升

2020-12-27 15:44:56 373

原创 Linux二进制分析

2020-11-27 22:59:21 234

原创程序是怎样跑起来的

2020-02-15 18:00:07 145

原创计算机是怎样跑起来的

附：Z80电路图。

2020-02-09 12:44:43 309 1

转载 ACTOR模型和CSP模型

http://www.cnblogs.com/netfocus/p/3365166.htmlhttp://www.jdon.com/45728

2016-05-02 21:21:27 925

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Linux内核0.11
wliulin: 作者：liheng gong 链接：https://www.zhihu.com/question/26825537/answer/34544526 来源：知乎著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。 Why map both the user process and kernel into virtual memory at the same time? Why not map in the user process when in user-space and map the kernel when in kernel-space? One reason: Performance. Swapping the virtual address space incurs a nontrivial cost. Worse, depending on the system, various caches must be flushed. For example, on x86, the TLB, which caches virtual to physical address translations, must be flushed whenever the virtual mappings change. On systems with virtually-tagged caches, such as older ARM architectures, the entirety of the data and instruction cache must be flushed whenever you context switch! Cache performance is everything on modern systems, so avoiding such flushes is of paramount importance.Consequently, by mapping both the kernel and user address spaces into memory at the same time, context switching into the kernel becomes relatively cheap,
Linux内核0.11
wliulin: 作者：liheng gong 链接：https://www.zhihu.com/question/26825537/answer/34544526 来源：知乎著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。 Why map both the user process and kernel into virtual memory at the same time? Why not map in the user process when in user-space and map the kernel when in kernel-space? One reason: Performance. Swapping the virtual address space incurs a nontrivial cost. Worse, depending on the system, various caches must be flushed. For example, on x86, the TLB, which caches virtual to physical address translations, must be flushed whenever the virtual mappings change. On systems with virtually-tagged caches, such as older ARM architectures, the entirety of the data and instruction cache must be flushed whenever you context switch! Cache performance is everything on modern systems, so avoiding such flushes is of paramount importance.Consequently, by mapping both the kernel and user address spaces into memory at the same time, context switching into the kernel becomes relatively cheap,
计算机是怎样跑起来的
reguozhi: 谢谢图片

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