linux-kernel - Re: [PATCH v13 bpf-next 1/1] rethook: x86: Add rethook x86 implementation

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Date:   Wed, 23 Mar 2022 13:34:54 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH v13 bpf-next 1/1] rethook: x86: Add rethook x86
 implementation

On Wed, Mar 23, 2022 at 08:41:19PM +0900, Masami Hiramatsu wrote:

> > Also, what's rethook for anyway?
> 
> Rethook is a feature which hooks the function return. Most of the
> logic came from the kretprobe. Simply to say, 'kretprobe - kprobe' is 
> the rethook :)

I got that far, but why did you take the bother to do these patches? Why
wasn't 'use kretprobe' a good enough option?