linux-kernel - Re: [RFC PATCH v2 5/5] btf: add CONFIG_BPF_SORT_BTF_BY_KIND

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Message-ID: <CAErzpmt8HOfZUtYSbmemvpwKO7=Y79ffJo--tLaEsHFUQCRtmA@mail.gmail.com>
Date: Tue, 21 Oct 2025 16:33:36 +0800
From: Donglin Peng <dolinux.peng@...il.com>
To: Eduard Zingerman <eddyz87@...il.com>
Cc: ast@...nel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
	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 v2 5/5] btf: add CONFIG_BPF_SORT_BTF_BY_KIND_NAME

On Tue, Oct 21, 2025 at 8:50 AM Eduard Zingerman <eddyz87@...il.com> wrote:
>
> On Mon, 2025-10-20 at 17:39 +0800, Donglin Peng wrote:
>
> [...]
>
> > diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig
> > index eb3de35734f0..08251a250f06 100644
> > --- a/kernel/bpf/Kconfig
> > +++ b/kernel/bpf/Kconfig
> > @@ -101,4 +101,12 @@ config BPF_LSM
> >
> >         If you are unsure how to answer this question, answer N.
> >
> > +config BPF_SORT_BTF_BY_KIND_NAME
> > +     bool "Sort BTF types by kind and name"
> > +     depends on BPF_SYSCALL
> > +     help
> > +       This option sorts BTF types in vmlinux and kernel modules by their
> > +       kind and name, enabling binary search for btf_find_by_name_kind()
> > +       and significantly improving its lookup performance.
> > +
>
> Why having this as an option?
> There are no downsides to always enabling, right?
> The cost of sorting btf at build time should be negligible.

Thanks, I'll remove this config option in the next version as suggested.

>
> [...]