Re: [RFC PATCH v3 00/37] perf tools: introduce 'perf bpf' command to load eBPF programs.

Alexei Starovoitov
2015-05-18T21:05:41Z

On 5/18/15 1:44 PM, Arnaldo Carvalho de Melo wrote:
>
> perf record --filter, to pass a filter to tracepoints, if I could
> instead of a filter expression pass, say, filter_bpf.o, that would seem
> natural for me, i.e. no new option, just an alternative type of filter,
> one way more powerful.
...
> I'd say keep it in --filter, that noticing it is a bpf object would
> dtrt:
>
> perf record --filter bpf_thing.o usleep 1
>

agree. make sense.
The only thing is that such bpf program defines both event and filter.
Existing --filter applies to --event, whereas this bpf_thing.o does both
and likely kprob-ing multiple events underneath.
I guess '--filter' still fits. Just need to document it clearly.