OPPO Kernel Craftsman

Dec 10, 2021 · Fundamentals

The Life Cycle of Block IO: From Generation to Return

The article walks through the entire block I/O lifecycle in mobile devices—defining block devices, describing how user actions and system processes generate I/O, detailing scheduling, bio-to-request conversion, dispatch via SCSI/UFS, and the interrupt‑driven return path that wakes waiting processes, linking each stage to performance and power metrics.