It's Go Time on Linux

This post delves into the specifics of how Go programs on Linux obtain the current time, highlighting the evolution from older system calls like `time` and `gettimeofday` to the more precise `clock_gettime`. It details Cloudflare's adoption of the Linux vDSO (Virtual Dynamically linked Shared Objects) mechanism for low-overhead time retrieval, significantly improving performance for `time.Now()` and `runtime.nanotime`. The post also includes benchmarks demonstrating the performance gains and discusses the importance of accurate timekeeping for various system functions and potential pitfalls like Y2K and leap second bugs.