Zero-Copy Pages in Rust: Or How I Learned To Stop Worrying And Love Lifetimes

The author provides detailed technical analysis of implementing zero-copy optimization in Rust database engines. The post explains how to eliminate CPU copies at two key boundaries: the OS boundary (using O_DIRECT I/O flags) and within the buffer pool (using Rust's lifetime system and borrowed references). Through code examples and architecture diagrams, the author demonstrates concrete patterns for achieving zero-copy page access critical for high-performance database engines.