| 提高嵌入式Linux时钟精度的方法 |
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| 引用本文： | 王 霞,马忠梅,何小庆,江文瑞,黄武陵.提高嵌入式Linux时钟精度的方法[J].计算机工程,2006,32(23):70-72,9. |
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| 作者姓名： | 王 霞 马忠梅 何小庆 江文瑞 黄武陵 |
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| 作者单位： | (1. 北京理工大学信息学院，北京 100081；2. 北京麦克泰软件技术有限公司，北京 100094；3. 中国科学院自动化研究所，北京 100080) |
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| 摘 要： | 突破Linux内核在实时应用方面的缺陷主要体现在增加Linux内核的可抢占性、细化时钟粒度和调度算法上。该文从时钟精度的角度出发，介绍了目前流行的嵌入式操作系统在实时性方面的改进方法，分析了MontaVista Linux采用的高精度定时器HRT机制的原理、HRT对Linux内核的改造方法及其在ARM平台上的实现方法等。
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| 关 键 词： | 嵌入式Linux 时钟精度 高精度定时器 实时系统 ARM |
Method of Timer Resolution Improvement for |
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| WANG Xia,MA Zhongmei,HE Xiaoqing,JIANG Wenrui,HUANG Wuling.Method of Timer Resolution Improvement for[J].Computer Engineering,2006,32(23):70-72,9. |
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| Authors: | WANG Xia MA Zhongmei HE Xiaoqing JIANG Wenrui HUANG Wuling |
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| Affiliation: | (1. School of Information, Beijing Institute of Technology, Beijing 100081; 2. Beijing Microtech Software Technology Ltd., Beijing 100094;
3. Institute of Automation, Chinese Academy of Sciences, Beijing 100080)
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| Abstract: | Linux with real-time constraints are growing in the field of embedded system. In order to break through obstacle in real-time applications aspects, it is sensible to add preempt feature in Linux kernel, improve timer resolution and modify schedule strategy to satisfy real-time requirments. The thesis summarizes several modification methods of improving timer resolution and focuses on popular method named HRT, which applies comprehensively in embedded Linux system. |
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| Keywords: | Embedded Linux Timer resolution HRT Real-time system ARM |
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