Re: [PATCH perf,bpf 5/5] perf util: generate bpf_prog_info_event for short living bpf programs

[Song Liu]

> On Nov 21, 2018, at 2:11 PM, Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote:
> 
> On Wed, Nov 21, 2018 at 11:55:02AM -0800, Song Liu wrote:
>> This patch enables perf-record to listen to bpf_event and generate
>> bpf_prog_info_event for bpf programs loaded and unloaded during
>> perf-record run.
>> 
>> To minimize latency between bpf_event and following bpf calls, separate
>> mmap with watermark of 1 is created to process these vip events. Then
>> a separate dummy event is attached to the special mmap. A separate thread
>> is used to only poll bpf events.
>> 
>> By default, perf-record will listen to bpf_event. Option no-bpf-event is
>> added in case the user would opt out.
> 
> I think only default perf-record for sampling should include it.
> perf record -e for tracepoints, kprobes and anything else should imply no-bpf-event.
> 

Maybe something like
  
   if (software_event && ! -g)
        no_bpf_event = true;

?

This will allow attaching kprobe on bpf helper and see which bpf program
calls it. 

Thanks,
Song