From: Leon Hwang <leon.hwang@linux.dev>
To: Xu Kuohai <xukuohai@huaweicloud.com>,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>,
Yonghong Song <yonghong.song@linux.dev>,
Jiri Olsa <jolsa@kernel.org>, KP Singh <kpsingh@kernel.org>,
Anton Protopopov <a.s.protopopov@gmail.com>,
Amery Hung <ameryhung@gmail.com>,
Eyal Birger <eyal.birger@gmail.com>, Rong Tao <rongtao@cestc.cn>
Subject: Re: [RFC PATCH bpf-next 00/12] bpf: Introduce static-defined tracing probe for BPF
Date: Tue, 30 Jun 2026 10:14:17 +0800 [thread overview]
Message-ID: <1f10e056-744e-45bf-af93-6192668be79c@linux.dev> (raw)
In-Reply-To: <8ea18b6a-932c-4eb0-a536-d52ce3e1f457@huaweicloud.com>
On 30/6/26 09:19, Xu Kuohai wrote:
> On 6/29/2026 9:53 PM, Leon Hwang wrote:
>
> So it is more of a user-space workaround than a formal solution. And even
> for this workaround, there is no need to add a new libbpf API to remove the
> stub. You can simply build two versions of bpf prog, one with subprog and
> one without. When you need to trace fentry, load the first one; otherwise,
> load the second one.
Yep.
>
> What SDT resolves is dynamic tracing after the prog is loaded, the hacking
> before loading does not apply.
>
I think current implementation is too complicated to justify this kind
of workaround. I'd be more comfortable with a simpler approach.
Thanks,
Leon
next prev parent reply other threads:[~2026-06-30 2:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-27 22:51 [RFC PATCH bpf-next 00/12] bpf: Introduce static-defined tracing probe for BPF Xu Kuohai
2026-06-27 20:51 ` [syzbot ci] " syzbot ci
2026-06-27 22:51 ` [RFC PATCH bpf-next 01/12] libbpf: Prepare bpf SDT probe section for the linker Xu Kuohai
2026-06-27 22:51 ` [RFC PATCH bpf-next 02/12] libbpf: Introduce bpf SDT probe macros Xu Kuohai
2026-06-27 22:51 ` [RFC PATCH bpf-next 03/12] libbpf: Add bpf_sdt_notes section parser Xu Kuohai
2026-06-27 22:51 ` [RFC PATCH bpf-next 04/12] bpf: Create insn_array map for bpf SDT probe Xu Kuohai
2026-06-27 15:34 ` bot+bpf-ci
2026-06-27 22:51 ` [RFC PATCH bpf-next 05/12] bpf: Collect SDT probe BTF IDs from BTF decl tags Xu Kuohai
2026-06-27 15:34 ` bot+bpf-ci
2026-06-27 22:51 ` [RFC PATCH bpf-next 06/12] bpf: Add type check for SDT probe site Xu Kuohai
2026-06-27 15:22 ` bot+bpf-ci
2026-06-27 22:51 ` [RFC PATCH bpf-next 07/12] bpf: Record probe name in SDT map Xu Kuohai
2026-06-27 22:51 ` [RFC PATCH bpf-next 08/12] libbpf: Add libbpf support to load SDT observer program Xu Kuohai
2026-06-27 22:51 ` [RFC PATCH bpf-next 09/12] bpf: Add kernel " Xu Kuohai
2026-06-27 15:22 ` bot+bpf-ci
2026-06-27 22:51 ` [RFC PATCH bpf-next 10/12] bpf: Support attach and detach for " Xu Kuohai
2026-06-27 22:51 ` [RFC PATCH bpf-next 11/12] bpf, x86: Add JIT support SDT for probe Xu Kuohai
2026-06-27 15:22 ` bot+bpf-ci
2026-06-27 22:51 ` [RFC PATCH bpf-next 12/12] selftests/bpf: Add tests for bpf SDT probe Xu Kuohai
2026-06-29 2:14 ` [RFC PATCH bpf-next 00/12] bpf: Introduce static-defined tracing probe for BPF Leon Hwang
2026-06-29 3:27 ` Xu Kuohai
2026-06-29 5:26 ` Leon Hwang
2026-06-29 7:51 ` Xu Kuohai
2026-06-29 10:55 ` Leon Hwang
2026-06-29 11:32 ` Xu Kuohai
2026-06-29 13:53 ` Leon Hwang
2026-06-30 1:19 ` Xu Kuohai
2026-06-30 2:14 ` Leon Hwang [this message]
2026-06-30 2:29 ` Xu Kuohai
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