From: Steven Rostedt <rostedt@goodmis.org>
To: Fuyu Zhao <zhaofuyu@vivo.com>
Cc: Jiri Olsa <olsajiri@gmail.com>, Song Liu <song@kernel.org>,
ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
martin.lau@linux.dev, yonghong.song@linux.dev, haoluo@google.com,
eddyz87@gmail.com, kpsingh@kernel.org, sdf@fomichev.me,
mhiramat@kernel.org, mathieu.desnoyers@efficios.com,
shuah@kernel.org, willemb@google.com, kerneljasonxing@gmail.com,
paul.chaignon@gmail.com, chen.dylane@linux.dev, memxor@gmail.com,
martin.kelly@crowdstrike.com, ameryhung@gmail.com,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
linux-trace-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org, yikai.lin@vivo.com
Subject: Re: [RFC PATCH bpf-next v1 0/3] bpf: Add BPF program type for overriding tracepoint probes
Date: Thu, 18 Sep 2025 11:32:34 -0400 [thread overview]
Message-ID: <20250918113234.3f9e556a@gandalf.local.home> (raw)
In-Reply-To: <9cb5b3d5-97bb-4165-9a84-394d3d45a20e@vivo.com>
On Thu, 18 Sep 2025 21:15:57 +0800
Fuyu Zhao <zhaofuyu@vivo.com> wrote:
> As for the reason not to unregister and register a new callback:
> callbacks registered directly inside the kernel cannot be unregistered from
> user space. From user space, we can only attach additional callbacks
> with BPF programs, but can not remove or replace the ones already
> registered in the kernel. Therefore, an override mechanism is needed.
The fact that user space cannot unregister or override the current
callbacks, to me is a feature and not a bug.
-- Steve
next prev parent reply other threads:[~2025-09-18 15:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-17 7:22 [RFC PATCH bpf-next v1 0/3] bpf: Add BPF program type for overriding tracepoint probes Fuyu Zhao
2025-09-17 7:22 ` [RFC PATCH bpf-next v1 1/3] bpf: Introduce BPF_PROG_TYPE_RAW_TRACEPOINT_OVERRIDE Fuyu Zhao
2025-09-17 7:22 ` [RFC PATCH bpf-next v1 2/3] libbpf: Add support for BPF_PROG_TYPE_RAW_TRACEPOINT_OVERRIDE Fuyu Zhao
2025-09-17 7:22 ` [RFC PATCH bpf-next v1 3/3] selftests/bpf: Add selftest for "raw_tp.o" Fuyu Zhao
2025-09-17 19:30 ` [RFC PATCH bpf-next v1 0/3] bpf: Add BPF program type for overriding tracepoint probes Steven Rostedt
2025-09-18 12:33 ` Fuyu Zhao
2025-09-18 15:24 ` Steven Rostedt
2025-09-19 12:54 ` Fuyu Zhao
2025-09-21 21:08 ` Chuck Wolber
2025-09-17 20:02 ` Song Liu
2025-09-18 8:05 ` Fuyu Zhao
2025-09-18 8:47 ` Jiri Olsa
2025-09-18 13:15 ` Fuyu Zhao
2025-09-18 15:32 ` Steven Rostedt [this message]
2025-09-19 13:00 ` Fuyu Zhao
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