How to use eBPF probes

This crate contains common code for eBPF-based measurement of RAPL perf-events. A starting point for this work has been the "bpf-perf" C examples, see this commit in the Linux kernel repository and the description of the feature.

Prerequisites

Install a rust stable toolchain: rustup install stable
Install a rust nightly toolchain with the rust-src component: rustup toolchain install nightly --component rust-src
Install bpf-linker: cargo install bpf-linker
Download our modified version of aya: download the whole repository at the given commit, and place the uncompressed directory next to the root directory of the measurement tool's directory.
Uncomment the last lines of the root Cargo.toml.

First, build the eBPF program that will be loaded into the kernel.

cargo xtask build-ebpf --release

To perform a release build you can use the --release flag. You may also change the target architecture with the --target flag.

cargo build --features enable_ebpf --release --bin cli_poll_rapl

sudo -E ./target/x86_64-unknown-linux-musl/release/cli_poll_rapl poll ebpf --domains pkg -f 1 -o stdout

Debug tip: remove --release flags and add environment variable RUST_LOG=debug