Pass arbitrary arguments to perf?

[alfaix]

Hey,

I use flamegraph to build flamegraph for perf.data recorded on a different machine (in a production environment). My kernel symbols do not match locally.

I was wondering if there's a way to read a specific kallsyms (i.e., pass --kallsyms=<...> to perf script). This works with the original perl flamegraph since perf script is run manually.

This makes me think that this is probably a broader topic of passing arguments to perf, not the profiled executable.

Would a PR for something like this be ok? How would you recommend to structure this? I see that e.g., --freq is introduced as a specific option, but copying all options from perf one-by-one is probably not a good idea, especially with versioning concerns. Perhaps an environment variable, or a --perf-args='--kallsyms=... [--... ]'? And then a blacklist of things that would interfere with flamegraph's work (e.g., --no-inline or --call-graph=)

Or if there's already a way to do this and I missed it, would you please show me to it. Thanks!

[djc]

copying all options from perf one-by-one is probably not a good idea, especially with versioning concerns

Is --kallsyms particularly recent? I'm not too worried about versioning concerns.