netdev - Re: [PATCH 04/18] bpf: Add name to struct bpf

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Message-ID: <CAPhsuW5u=6MEWKU4-Cfdr3VfYn+NuTgX6SezC_W33WZsM3j8ng@mail.gmail.com>
Date:   Wed, 26 Feb 2020 13:14:43 -0800
From:   Song Liu <song@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Andrii Nakryiko <andriin@...com>, Yonghong Song <yhs@...com>,
        Song Liu <songliubraving@...com>,
        Martin KaFai Lau <kafai@...com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...hat.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        John Fastabend <john.fastabend@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 04/18] bpf: Add name to struct bpf_ksym

On Wed, Feb 26, 2020 at 5:04 AM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Adding name to 'struct bpf_ksym' object to carry the name
> of the symbol for bpf_prog, bpf_trampoline, bpf_dispatcher.
>
> The current benefit is that name is now generated only when
> the symbol is added to the list, so we don't need to generate
> it every time it's accessed.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

The patch looks good. But I wonder whether we want pay the cost of
extra 128 bytes per bpf program. Maybe make it a pointer and only
generate the string when it is first used?

Thanks,
Song