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

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Message-ID: <8606158.T7Z3S40VBb@7950hx>
Date: Wed, 19 Nov 2025 10:47:11 +0800
From: Menglong Dong <menglong.dong@...ux.dev>
To: Menglong Dong <menglong8.dong@...il.com>,
 Alexei Starovoitov <alexei.starovoitov@...il.com>,
 Leon Hwang <leon.hwang@...ux.dev>
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 2025/11/19 08:28, Alexei Starovoitov wrote:
> 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.

I did some research before, and I find that most arch
have such RSB-like stuff. I'll have a look at the loongarch
later(maybe after the LPC, as I'm forcing on the English practice),
and Leon is following the arm64.

For the other arch, we don't have the machine, and I think
it needs some else help.

Thanks!
Menglong Dong

> 
>