linux-kernel - Re: [PATCH bpf-next v2 0/6] bpf trampoline support "jmp" mode

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Message-ID: <CAADnVQK5U28Wv2tSkymZY6ixCoUrSDoohB5wJmpyZL7t-Czk4w@mail.gmail.com>
Date: Mon, 17 Nov 2025 22:31:04 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, 
	Daniel Borkmann <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, Eduard <eddyz87@...il.com>, 
	Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, 
	Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, jiang.biao@...ux.dev, 
	bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	linux-trace-kernel <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 0/6] bpf trampoline support "jmp" mode

On Sun, Nov 16, 2025 at 7:49 PM Menglong Dong <menglong8.dong@...il.com> wrote:
>
> For now, the bpf trampoline is called by the "call" instruction. However,
> it break the RSB and introduce extra overhead in x86_64 arch.

Please include performance numbers in the cover letter when you respin.