eBPF is a Linux kernel technology that lets programs extend or observe supported kernel behavior without changing kernel source code or loading a kernel module. It is not a standalone product: the program type and attachment point determine what the program can see and do, making eBPF useful for networking, observability, tracing, profiling, and security.
What is eBPF?
eBPF is a mechanism for running small programs at defined points in the Linux kernel. A program can respond to events such as network activity, a trace event, or activity associated with a control group, subject to the capabilities of its specific program type. The Linux kernel documentation describes the underlying system in its BPF documentation; the community-maintained eBPF overview provides examples of how infrastructure tools use it.
The name comes from Berkeley Packet Filter, but current eBPF is not limited to packet filtering. It is a broader execution mechanism with different program categories and hooks. Two eBPF tools can therefore use the same underlying technology for very different jobs.
How does eBPF work?
- Write and compile a program. Programs are commonly written in C and compiled with LLVM, although other toolchains can produce eBPF bytecode.
- Submit it from user space. A loader sends the program to the kernel through the BPF system call. The requested program type and attachment point shape its available context and operations.
- Pass verification. Before allowing the program to run, the kernel verifier checks it against safety constraints.
- Attach it to a supported hook. Once loaded and attached, the program runs when its relevant event or hook occurs.
- Exchange data as needed. eBPF maps can hold data that programs and user-space processes access, and can support communication between programs.
The program type matters throughout this process: it determines what information the program receives, which operations it may perform, and what its return value means. The eBPF program-type reference describes the distinctions among common categories.
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What does the eBPF verifier check?
The verifier limits which programs the kernel will accept. Its checks include constraints related to termination, memory access, packet bounds, and locks. This helps prevent classes of unsafe behavior, but it does not prove that a program implements the right policy, produces useful results, or is appropriate for a production workload. Program review, least-privilege access, kernel-specific validation, and monitoring remain operational responsibilities. See the verifier reference for its role and constraints.
Accepted programs may be JIT-compiled, but that does not guarantee a particular performance gain. Impact depends on the program, hook, kernel, and workload; measure the actual deployment rather than assuming that eBPF is automatically faster or cost-free.
What can eBPF do in IT infrastructure?
| Use | How eBPF can help | What varies |
|---|---|---|
| Networking | Process or inspect traffic, apply filtering, and support traffic decisions at suitable network hooks. | The right hook depends on the job. XDP and other network program types have different roles and capabilities. |
| Observability | Collect or aggregate signals in the kernel and provide information for system visibility. | What is collected, how often a program runs, and whether it aggregates data in-kernel affect overhead and usefulness. |
| Tracing and profiling | Attach to supported kernel or user-space probe points and trace events to investigate behavior or performance. | The attachment mechanism depends on the question being investigated and the environment’s support. |
| Security | Enable monitoring or controls using contexts such as system calls, sockets, packets, and Linux Security Module hooks. | eBPF is an enabling mechanism for security tools, not a complete security product by itself. |
These are distinct applications, not interchangeable settings on one universal program. The eBPF community site describes examples including custom metrics, network insight, security, and performance monitoring. It also lists organizations such as Google, Netflix, Android, Meta, S&P Global, and Cloudflare as production users. Those examples do not establish an adoption rate or mean those organizations use the same deployment pattern.
What should teams check before deploying eBPF?
- Job and hook: Match the program type and attachment point to the task—such as a packet path, trace event, kernel function, cgroup event, or security hook.
- Kernel support: Confirm that the target kernel supports the required program type and interfaces. Community references are useful, but kernel-version-specific behavior should be checked against the target system.
- Privileges: Requirements depend on the operation and kernel. Linux capabilities relevant to eBPF include CAP_BPF for loading programs and creating maps, CAP_PERFMON for some tracing-related needs, and CAP_NET_ADMIN for network programs. Check the exact requirements for the target kernel and operation in the kernel documentation.
- Interface stability: Helper functions are part of the UAPI and have its stability guarantees. KFuncs are not UAPI and do not carry the same guarantees, so programs that use them should handle absence or change defensively.
- Data and overhead: Establish what the program collects or changes, how frequently it runs, whether it aggregates data in the kernel, and how it behaves under the relevant workload. Do not assume a performance improvement without a measurement for that workload.
- Operations and rollout: Plan loading and lifecycle management, access controls, observability, safe rollout, and resource use. Maps, pinning, object references, and resource limits are relevant operational concepts; the eBPF concepts reference covers them.
Why is eBPF gaining attention?
eBPF gives infrastructure tools a way to extend or observe selected kernel behavior without modifying kernel source code or installing a kernel module. That flexibility supports a range of network, visibility, tracing, and security use cases. Its value is practical rather than automatic: teams still need to choose the appropriate hook, validate compatibility and permissions, and understand the program’s behavior in their workload.
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For a structured next step, the eBPF community’s getting-started guide points readers to technical documentation, tutorials, a hands-on lab, and books including What Is eBPF?, Learning eBPF, and BPF Performance Tools.
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