Low Power Persistent Logging in Embedded Linux for Wearable and Edge Devices

Embedded devices such as smart glasses need logging systems that can keep records while using little energy and protecting flash storage from wear. In this study, a logging system for embedded Linux was designed with cache-based write control and file rotation. Tests were carried out in 120 sessions on both wearable devices and a development board under different workloads. The system reduced average energy use by 18.9% compared with the default setup, lowered write amplification by 26.8%, and cut the 99th percentile of log commit delay from 72 ms to 49 ms. In power loss tests, all key log entries were recovered, while the baseline lost about 6.7% of records. These results show that adjusting cache writes and rotation can improve efficiency and reliability, and can also extend the lifetime of flash storage in devices with strict power limits. The method offers a practical base for use in wearables and edge platforms, although further work on wider hardware types and long-term field studies is still needed.