[Bug bpf/22330] bpf: generate printf via event tuples, userspace formatting postprocessing

me at serhei dot io sourceware-bugzilla@sourceware.org
Wed Oct 17 21:28:00 GMT 2018


https://sourceware.org/bugzilla/show_bug.cgi?id=22330

--- Comment #3 from Serhei Makarov <me at serhei dot io> ---
Another reason to rework printf() -- the trace_printk() implementation
hardcodes any string operands to 64 bytes:

https://github.com/torvalds/linux/blob/6b2edf27fe26c73cd67b6bf5ffb23dce882e1455/kernel/trace/bpf_trace.c#L226

Prioritizing this PR on account of the 64-byte trace_printk() limitation.

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