Allow attaching to bare tracepoints #646
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=416125 expired. Closing PR. |
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Some subsystems only have bare tracepoints (a tracepoint with no associated trace event) to avoid the problem of trace events being an ABI that can't be changed. From bpf presepective, bare tracepoints are what it calls RAW_TRACEPOINT(). Since bpf assumed there's 1:1 mapping, it relied on hooking to DEFINE_EVENT() macro to create bpf mapping of the tracepoints. Since bare tracepoints use DECLARE_TRACE() to create the tracepoint, bpf had no knowledge about their existence. By teaching bpf_probe.h to parse DECLARE_TRACE() in a similar fashion to DEFINE_EVENT(), bpf can find and attach to the new raw tracepoints. Enabling that comes with the contract that changes to raw tracepoints don't constitute a regression if they break existing bpf programs. We need the ability to continue to morph and modify these raw tracepoints without worrying about any ABI. Update Documentation/bpf/bpf_design_QA.rst to document this contract. Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Reuse module_attach infrastructure to add a new bare tracepoint to check we can attach to it as a raw tracepoint. Signed-off-by: Qais Yousef <qais.yousef@arm.com> Acked-by: Yonghong Song <yhs@fb.com>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=417431 irrelevant now. Closing PR. |
Pull request for series with
subject: Allow attaching to bare tracepoints
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=416125