linux-kernel - Re: [PATCH bpf-next v2] libbpf: Load btf

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Date:   Fri, 17 Jan 2020 13:55:08 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     KP Singh <kpsingh@...omium.org>
Cc:     open list <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        Brendan Jackman <jackmanb@...omium.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Anton Protopopov <a.s.protopopov@...il.com>,
        Florent Revest <revest@...omium.org>
Subject: Re: [PATCH bpf-next v2] libbpf: Load btf_vmlinux only once per object.

On Fri, Jan 17, 2020 at 1:28 PM KP Singh <kpsingh@...omium.org> wrote:
>
> From: KP Singh <kpsingh@...gle.com>
>
> As more programs (TRACING, STRUCT_OPS, and upcoming LSM) use vmlinux
> BTF information, loading the BTF vmlinux information for every program
> in an object is sub-optimal. The fix was originally proposed in:
>
>    https://lore.kernel.org/bpf/CAEf4BzZodr3LKJuM7QwD38BiEH02Cc1UbtnGpVkCJ00Mf+V_Qg@mail.gmail.com/
>
> The btf_vmlinux is populated in the object if any of the programs in
> the object requires it just before the programs are loaded and freed
> after the programs finish loading.
>
> Reported-by: Andrii Nakryiko <andrii.nakryiko@...il.com>
> Reviewed-by: Brendan Jackman <jackmanb@...omium.org>
> Signed-off-by: KP Singh <kpsingh@...gle.com>
> ---

Looks great!

Acked-by: Andrii Nakryiko <andriin@...com>

>  tools/lib/bpf/libbpf.c | 153 +++++++++++++++++++++++++++--------------
>  1 file changed, 101 insertions(+), 52 deletions(-)
>

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