linux-kernel - Re: [PATCH v3 perf,bpf 08/11] perf, bpf: save btf information as headers to perf.data

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Date:   Sun, 17 Feb 2019 23:58:16 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Song Liu <songliubraving@...com>
Cc:     Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, kernel-team@...com,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH v3 perf,bpf 08/11] perf, bpf: save btf information as
 headers to perf.data

Hi,

On Sat, Feb 16, 2019 at 6:55 AM Song Liu <songliubraving@...com> wrote:
>
> This patch enables perf-record to save btf information as headers to
> perf.data A new header type HEADER_BTF is introduced for this data.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---

[SNIP]
> +static void print_btf(struct feat_fd *ff, FILE *fp)
> +{
> +       struct perf_env *env = &ff->ph->env;
> +       struct rb_root *root;
> +       struct rb_node *next;
> +
> +       down_read(&env->bpf_progs.bpf_info_lock);
> +
> +       root = &env->bpf_progs.btfs;
> +       next = rb_first(root);
> +
> +       while (next) {
> +               struct btf_node *node;
> +
> +               node = rb_entry(next, struct btf_node, rb_node);
> +               next = rb_next(&node->rb_node);
> +               fprintf(fp, "# bpf_prog_info of id %u\n", node->id);

How about saying it's "btf" info?

Thanks,
Namhyung


> +       }
> +
> +       up_read(&env->bpf_progs.bpf_info_lock);
> +}