eBPF Prefetch Hints

⚡ Speed up frequently used binaries by hinting the Linux kernel to prefetch them — powered by eBPF.

🚀 What It Does

This tool uses an eBPF kernel-side program to track execution frequency of binaries under /usr/bin, and a user-space controller that:

• Aggregates call frequency from a BPF map
• Periodically identifies hot binaries
• Suggests prefetching those binaries via system hints

🔧 Features

• eBPF‑based tracing of binary execution under /usr/bin
• Maintains a frequency map of hot binaries in the kernel
• User‑defined polling interval
    • run sudo ./prefetch_hint <seconds>
    • defaults to 300 s (5 min) when omitted
• Advises the kernel with posix_fadvise() to prefetch the .text segment of each hot ELF binary

Prerequisites

• Linux kernel with eBPF support
• Clang/LLVM and libbpf-dev
• bpftool
• Root privileges

🛠️ Build and Run

make all
sudo ./prefetch_hint <time_interval>

📦 Header provenance

The bundled vmlinux.h was generated on Ubuntu 22.04.04 LTS (kernel 6.5.0, BTF enabled) using bpftool v7.3.0. Regenerate with make headers if you need an exact match for a custom kernel.