linux-kernel - Re: [PATCH bpf-next v3 0/6] bpf trampoline support "jmp" mode

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Message-ID: <CAADnVQJF5qkT8J=VJW00pPX7=hVdwn2545BzZPEi=mPwFouThw@mail.gmail.com>
Date: Tue, 18 Nov 2025 16:28:27 -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 v3 0/6] bpf trampoline support "jmp" mode

On Tue, Nov 18, 2025 at 4:36 AM Menglong Dong <menglong8.dong@...il.com> wrote:
>
> As we can see above, the performance of fexit increase from 80.544M/s to
> 136.540M/s, and the "fmodret" increase from 78.301M/s to 159.248M/s.

Nice! Now we're talking.

I think arm64 CPUs have a similar RSB-like return address predictor.
Do we need to do something similar there?
The question is not targeted to you, Menglong,
just wondering.