linux-kernel - Re: [PATCH v9 perf,bpf 09/15] perf, bpf: save btf information as headers to perf.data

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Date:   Fri, 15 Mar 2019 16:26:10 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        bpf@...r.kernel.org, Networking <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>, sdf@...ichev.me
Subject: Re: [PATCH v9 perf,bpf 09/15] perf, bpf: save btf information as
 headers to perf.data

Em Fri, Mar 15, 2019 at 04:06:51PM -0300, Arnaldo Carvalho de Melo escreveu:
> And yes, there are BPF programs with BTF information associated:
 
> [root@...co perf]# bpftool map dump pids_filtered
> [{
>         "key": 2592,
>         "value": true
>     },{
>         "key": 20511,
>         "value": true
>     }
> ]
> [root@...co perf]#
 
> I.e. bpftool can find the BTF info and thus is able to show the
> 'pids_filtered' map keys and values pretty printed, not just as hex raw
> data.
 
> I'm trying to find out why 'bpftool map dump' finds the BTF info while
> perf_event__synthesize_one_bpf_prog() doesn't.

Humm, the BTF info above is for BPF _maps_ not for _programs_, I think
you haven't added BTF info for maps in the perf.data header, right?

- Arnaldo