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Date:   Tue, 01 Sep 2020 23:14:53 -0700
From:   John Fastabend <>
To:     Andrii Nakryiko <>,,,,
        Andrii Nakryiko <>
Subject: RE: [PATCH v2 bpf-next 03/14] libbpf: support CO-RE relocations for
 multi-prog sections

Andrii Nakryiko wrote:
> Fix up CO-RE relocation code to handle relocations against ELF sections
> containing multiple BPF programs. This requires lookup of a BPF program by its
> section name and instruction index it contains. While it could have been done
> as a simple loop, it could run into performance issues pretty quickly, as
> number of CO-RE relocations can be quite large in real-world applications, and
> each CO-RE relocation incurs BPF program look up now. So instead of simple
> loop, implement a binary search by section name + insn offset.
> Signed-off-by: Andrii Nakryiko <>
> ---
>  tools/lib/bpf/libbpf.c | 82 +++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 74 insertions(+), 8 deletions(-)

Acked-by: John Fastabend <>

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