Why omitting pid in the perf_event_open API

[0x161e-swei]

I noticed that in src/python/bcc/table.py, function open_perf_event does not expose the pid parameter in the API. Similarly in src/cc/api/BPF.cc, function open_perf_event does not expose the pid parameter in the API. However, in the src/cc/libbpf.c source code, bpf_perf_open_event offers the pid in its parameters.
What was the reason behind not exposing the pid to the bcc pyhton or cc API?

[chenhengqi]

Not sure why it is omited in the first place. If you have such requirements, PR is welcome.

[0x161e-swei]

Hi Hengqi, I opened a PR (#4682) related to this discussion. Would you mind taking a look?