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When GTS is running in a container runtime which has configured CPU or memory limits or under an init system that uses cgroups to impose CPU and memory limits the values the Go runtime sees for GOMAXPROCS and GOMEMLIMIT are still based on the host resources, not the cgroup. At least for the throttling middlewares which use GOMAXPROCS to configure their queue size, this can result in GTS running with values too big compared to the resources that will actuall be available to it. This introduces 2 dependencies which can pick up resource contraints from the current cgroup and tune the Go runtime accordingly. This should result in the different queues being appropriately sized and in general more predictable performance. These dependencies are a no-op on non-Linux systems or if running in a cgroup that doesn't set a limit on CPU or memory. The automatic tuning of GOMEMLIMIT can be disabled by either explicitly setting GOMEMLIMIT yourself or by setting AUTOMEMLIMIT=off. The automatic tuning of GOMAXPROCS can similarly be counteracted by setting GOMAXPROCS yourself. |
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|---|---|---|
| .. | ||
| asm | ||
| internal | ||
| link | ||
| .clang-format | ||
| .gitignore | ||
| ARCHITECTURE.md | ||
| CODE_OF_CONDUCT.md | ||
| collection.go | ||
| CONTRIBUTING.md | ||
| doc.go | ||
| elf_reader_fuzz.go | ||
| elf_reader.go | ||
| info.go | ||
| LICENSE | ||
| linker.go | ||
| Makefile | ||
| map.go | ||
| marshalers.go | ||
| pinning.go | ||
| prog.go | ||
| README.md | ||
| run-tests.sh | ||
| syscalls.go | ||
| types_string.go | ||
| types.go | ||
eBPF
eBPF is a pure Go library that provides utilities for loading, compiling, and debugging eBPF programs. It has minimal external dependencies and is intended to be used in long running processes.
- asm contains a basic assembler
- link allows attaching eBPF to various hooks
- perf allows reading from a
PERF_EVENT_ARRAY - cmd/bpf2go allows embedding eBPF in Go
The library is maintained by Cloudflare and Cilium. Feel free to join the #libbpf-go channel on Slack.
Current status
The package is production ready, but the API is explicitly unstable right now. Expect to update your code if you want to follow along.
Requirements
- A version of Go that is supported by upstream
- Linux 4.9, 4.19 or 5.4 (versions in-between should work, but are not tested)
Useful resources
- eBPF.io (recommended)
- Cilium eBPF documentation (recommended)
- Linux documentation on BPF
- eBPF features by Linux version
Regenerating Testdata
Run make in the root of this repository to rebuild testdata in all
subpackages. This requires Docker, as it relies on a standardized build
environment to keep the build output stable.
The toolchain image build files are kept in testdata/docker/.
License
MIT