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

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Message-ID: <f7024fc31ccc9c8b8bdfe2865cdf3604079e0039.camel@gmail.com>
Date: Mon, 20 Oct 2025 17:50:38 -0700
From: Eduard Zingerman <eddyz87@...il.com>
To: Donglin Peng <dolinux.peng@...il.com>, ast@...nel.org
Cc: 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 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.

[...]