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IT Services Circle

Apr 1, 2022 · Fundamentals

Using likely/unlikely Macros for Performance Optimization in the Linux Kernel

This article explains how the Linux kernel’s likely and unlikely macros, which wrap GCC’s __builtin_expect, guide branch prediction to improve cache utilization and pipeline efficiency, and demonstrates their impact with sample code and assembly analysis.

C++Linux kernelbranch prediction

0 likes · 7 min read

Using likely/unlikely Macros for Performance Optimization in the Linux Kernel

Refining Core Development Skills

Mar 30, 2022 · Fundamentals

Understanding Linux Kernel likely/unlikely Macros for Performance Optimization

This article explains how the Linux kernel's likely and unlikely macros, which wrap __builtin_expect, guide the compiler's branch prediction to improve cache usage and pipeline efficiency, and demonstrates the effect with sample C code and assembly output.

C++KernelLinux

0 likes · 9 min read

Understanding Linux Kernel likely/unlikely Macros for Performance Optimization