CRII: CSR: System Support for Reactive Sensor Operation for Efficiency and Performance

在移动和可穿戴设备上，许多传感器提供了现实世界和数字领域之间的连接，使计算能够访问多种形式的原始数据，包括音频、视频、惯性运动传感和触摸屏控制。通过持续传感，移动设备服务在个人计算、辅助技术和许多其他领域发挥着重要作用。然而，从高数据速率传感器中获得富有表现力的输入，目前受到处理密集的原始数据流的效率和性能的基本限制。这在很大程度上是因为现代移动系统中的传感器配置和控制导致了显著的系统延迟，从而阻止了对传感器操作的即时控制，并限制了算法的表现力。本项目追求操作系统和传感器架构的转换，为响应式传感器操作提供系统支持：使用低级进程来观察和响应上下文，立即执行开发人员定义的传感器配置、采样和处理，然后在应用层提供数据访问。这种模式为开发人员提供了对传感器操作的表达性访问，同时在移动系统中保持能源效率和高性能。因此，该项目识别系统原则，通过操作系统服务、系统库、守护进程和传感器系统架构修改，为传感器处理和控制建模和设计反应性编程抽象。

On mobile and wearable devices, many sensors provide connections between the real world and the digital realm, enabling computing access to many forms of raw data, including audio, video, inertial motion sensing, and touchscreen control. Through continuous sensing, mobile device services play a large role in personal computing, assistive technology, and many other fields. However deriving expressive input from high data rate sensors currently suffers from fundamental limitations to the efficiency and performance of handling densely pipelined streams of raw data. This is largely because sensor configuration and control in modern mobile systems induces significant system latency, preventing immediate control of sensor operation and limiting algorithmic expressiveness. This project pursues the transformation of operating system and sensor architecture to provide system support for reactive sensor operation: using a low-level process to observe and react to context, immediately executing developer-defined sensor configuration, sampling, and processing before providing data access at the application layer. This paradigm provides developers with expressive access to sensor operation while maintaining energy-efficiency and high-performance in the mobile system. Thus, the project discerns systems principles to model and design reactive programming abstractions for sensor processing and control through operating system services, system libraries, daemon processes, and sensor system architecture modifications.