Re: [PATCH v3 perf,bpf 11/11] perf, bpf: save information about short living bpf programs

Jiri Olsa
2019-02-17T23:06:03Z

On Fri, Feb 15, 2019 at 01:53:54PM -0800, Song Liu wrote:
> To annotate bpf programs in perf, it is necessary to save information in
> bpf_prog_info and btf. For short living bpf program, it is necessary to
> save these information before it is unloaded.
>
> This patch saves these information in a separate thread. This thread
> creates its own evlist, that only tracks bpf events. This evlists uses
> ring buffer with very low watermark for lower latency. When bpf load
> events are received, this thread tries to gather information via sys_bpf
> and save it in perf_env.

could we make this a generic? like havving support
to create a thread that would process sideband evets?

itcould be used for the that buildid stuff and for
things like getting full command lines from comm
events and such

jirka