linux-kernel - Re: [PATCH perf,bpf 5/5] perf util: generate bpf_prog_info

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Date:   Wed, 21 Nov 2018 14:11:47 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ast@...nel.org, daniel@...earbox.net, acme@...nel.org,
        peterz@...radead.org, kernel-team@...com
Subject: Re: [PATCH perf,bpf 5/5] perf util: generate bpf_prog_info_event for
 short living bpf programs

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.