Linux系统运行态的动态变频低功耗策略

Low Power Strategy for Linux Running Mode Based on Dynamic Frequency Scaling

基于自主设计的嵌入式低功耗平台,深入分析了Linux系统运行态的低功耗管理技术。在分析Linux运行时动态变频技术的基础上,设计实现了动态变频的驱动层和内核适配层,提出了基于打分制的用户层策略和低开销的ondemand内核态策略。实验结果表明,在典型的应用场景下,采用提出的系统运行态功耗管理技术后,与优化前相比,系统运行功耗可降低28%。

Based on self-designed embedded low-power platform, an in-depth analysis was made on power consumption in Linux running mode, and power management technology in Linux running mode was discussed in detail. Dynamic frequency scaling （DFS） technique in Linux running mode was analyzed systemically, and the driver and kernel adaptive level for DFS were designed and implemented. A user strategy based on points system and a so- called on-demand kernel scheme with low overhead were presented. Experimental results indicated that, with the proposed optimization approaches, the system power in running mode was reduced by 28% in typical application scenario, compared to that before optimization.