linux-kernel - Re: [RFC PATCH v3 3/3] btf: Reuse libbpf code for BTF type sorting verification and binary search

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Message-ID: <CAADnVQLdN1mU-jR70WkkrWcfHXU1OOKDfWLdHS5Ji3-Fe++-xA@mail.gmail.com>
Date: Mon, 27 Oct 2025 12:55:59 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Donglin Peng <dolinux.peng@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>, LKML <linux-kernel@...r.kernel.org>, 
	bpf <bpf@...r.kernel.org>, Eduard Zingerman <eddyz87@...il.com>, 
	Andrii Nakryiko <andrii.nakryiko@...il.com>, Alan Maguire <alan.maguire@...cle.com>, 
	Song Liu <song@...nel.org>, pengdonglin <pengdonglin@...omi.com>
Subject: Re: [RFC PATCH v3 3/3] btf: Reuse libbpf code for BTF type sorting
 verification and binary search

On Mon, Oct 27, 2025 at 6:54 AM Donglin Peng <dolinux.peng@...il.com> wrote:
>
> +
> +/*
> + * btf_sort.c is included directly to avoid function call overhead
> + * when accessing BTF private data, as this file is shared between
> + * libbpf and kernel and may be called frequently (especially when
> + * funcgraph-args or func-args tracing options are enabled).
> + */
> +#include "../../tools/lib/bpf/btf_sort.c"

function call overhead? I don't believe it's measurable.

Don't do it on libbpf side either.

pw-bot: cr