Xcover, test coverage without instrumentation, using eBPF

What it does

Profile coverage of functional tests without instrumenting your binaries. - maxgio92/xcover

In the maker’s words, at launch

xcover started as a personal project, and we've already started using it internally at Chainguard to profile the test coverage of our packages. It measures function coverage, without instrumentation required at compile time, so that you can test the the binaries that you ship. It works with any ELF. This helps when…

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  Xcc700: Self-hosting mini C compiler for ESP32 (Xtensa) in 700 linesDec 2025 · github.com · ▲154

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  Alaz: Open-Source, Self-Hosted, eBPF-Based K8s Monitoring2023 · github.com · ▲101

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  xstack – Passive eBPF Linux stack profiling without tracepoints2025 · tanelpoder.com · ▲6

  Here's the latest eBPF performance tool of mine - xstack. It's a minimal tool, just 165 lines of eBPF C and under 500 lines of userland C code (including all comments and boilerplate!). It uses the libbpf and (Rust) BlazeSym libraries though (which are a lot of code). The point (and difference) of this tool is that it can sample both the kernel and userspace stack traces of all threads in your system. Traditionally, the "bpf_get_stack()" helper can not read userspace stack traces of other tasks in Linux, but since Linux 5.18 we can combine sleepable eBPF task iterator programs with a new…

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