基于android 的嵌入式设备优化研究
发布时间：2018-07-22 21:20
【摘要】：近几年随着智能手机跟平板等移动设备的发展，特别是伴随的android的诞生，其已经成为当前移动设备上主流的嵌入式操作系统，己引起了商业界和学术界的广泛关注，且越来越多的厂商都推出基于android操作系统的手机或者平板，而且很多互联网公司也开始推出基于android的手机。由于android是开源操作系统，并且很难做到硬件与软件的完美结合，如何使操作系统更好的去适应硬件成为一个研究的热点，因此优化android操作系统使得它与硬件的更加融合具有很高的研究价值。针对上述问题，本文主要从两个方面去优化android操作系统，一是性能方面，二是功耗方面。 性能方面的优化主要是以提升用户体验为目的，本论文主要是从两个方面进行性能优化，一个是开机启动的优化，因为开关机是用户的经常性行为，所以启动时间的优化是很容易体验到。本文利用cpu双核性能优势以及调换android的开机启动过程中的一些服务的顺序来实现开机的性能优化，优化结束后启动时间明显降低。另一方面是图形图像库skia的优化，通过oprofile等测试工具测的在某些情境下的图像处理的热点函数，从这些方面去优化skia库的源码，优化结束后用户浏览网页以及看电子书更加流畅。 功耗方面的优化主要是在满足用户对性能需求的前提下，，尽可能降低系统的能耗，延长设备的待机时间。本文主要是对android的电源管理以及cpu的调频策略等方面进行优化。重点是对android特有的电源管理策略和wakelock机制进行分析研究，提出了一套基于wakelock机制的降低功耗的方法，优化结束后能明显降低功耗。对调频策略方面的优化主要分析android系统的调频策略以及提出了自己一些看法，对降低功耗有一定的帮助。
[Abstract]:With the development of mobile devices such as smartphones and tablets in recent years , especially the birth of android , it has become the mainstream embedded operating system on mobile devices , which has caused extensive attention from the business community and academia , and more and more manufacturers have launched android - based mobile phones . Since android is an open source operating system and it is difficult to achieve the perfect combination of hardware and software , how to make the operating system better adapt to hardware becomes a research hotspot .
Performance optimization is mainly aimed at improving user experience . This thesis is mainly from two aspects : performance optimization , one is optimization of power - on startup , because the switch machine is a user ' s recurrent behavior , the optimization of starting time is very easy to experience . On the other hand , the optimization of graphics image library skia , the optimization of image processing under certain situations , such as oprofile , are used to optimize the source code of skia library . After optimization , the user browses the web page and the e - book is more fluent .
The optimization of power consumption is mainly to reduce the energy consumption of the system as much as possible and prolong the standby time of the equipment . This paper mainly analyzes the power management strategy of android and the frequency modulation strategy of the cpu , and puts forward a set of methods of reducing power consumption based on the wakelock mechanism . The optimization of frequency modulation strategy mainly analyzes the frequency modulation strategy of android system and puts forward some opinions , which can help reduce power consumption .
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP368.1
本文编号：2138608
[Abstract]:With the development of mobile devices such as smartphones and tablets in recent years , especially the birth of android , it has become the mainstream embedded operating system on mobile devices , which has caused extensive attention from the business community and academia , and more and more manufacturers have launched android - based mobile phones . Since android is an open source operating system and it is difficult to achieve the perfect combination of hardware and software , how to make the operating system better adapt to hardware becomes a research hotspot .
Performance optimization is mainly aimed at improving user experience . This thesis is mainly from two aspects : performance optimization , one is optimization of power - on startup , because the switch machine is a user ' s recurrent behavior , the optimization of starting time is very easy to experience . On the other hand , the optimization of graphics image library skia , the optimization of image processing under certain situations , such as oprofile , are used to optimize the source code of skia library . After optimization , the user browses the web page and the e - book is more fluent .
The optimization of power consumption is mainly to reduce the energy consumption of the system as much as possible and prolong the standby time of the equipment . This paper mainly analyzes the power management strategy of android and the frequency modulation strategy of the cpu , and puts forward a set of methods of reducing power consumption based on the wakelock mechanism . The optimization of frequency modulation strategy mainly analyzes the frequency modulation strategy of android system and puts forward some opinions , which can help reduce power consumption .
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP368.1
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本文编号：2138608
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