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

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Message-ID: <20190217230557.GF7443@krava>
Date:   Mon, 18 Feb 2019 00:05:57 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ast@...nel.org, daniel@...earbox.net, kernel-team@...com,
        peterz@...radead.org, acme@...hat.com, jolsa@...nel.org,
        namhyung@...nel.org
Subject: Re: [PATCH v3 perf,bpf 11/11] perf, bpf: save information about
 short living bpf programs

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