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[RFC] introduce periodic BPF programs #924

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[RFC] introduce periodic BPF programs #924

wants to merge 1 commit into from

Commits on Jan 31, 2023

  1. link: introduce periodic BPF programs 

    link.Periodic attaches an eBPF program to a periodic perf event running
on specified CPU at specified frequency. Similarly, link.PeriodicAllCpus
does the same for each online CPU. Under the hood, this uses a
PERF_COUNT_SW_CPU_CLOCK perf event.

The design of this module is symmetric to the tracepoint module and
re-uses most of the logic and based on an original example by @florianl
https://gist.github.com/florianl/5d9cc9dbb3822e03f6f65a073ffbedbb.

The main use-case for this module is to periodically sample kernel state
to build higher level performance metrics like runqlen or a custom
profiler using bpf_get_stackid().

Signed-off-by: Jean-Tiare Le Bigot <jt@yadutaf.fr>
    @yadutaf
    yadutaf committed Jan 31, 2023
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