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Date:   Wed, 23 Mar 2022 13:34:54 +0100
From:   Peter Zijlstra <>
To:     Masami Hiramatsu <>
Cc:     Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        Dave Hansen <>,,
        Jiri Olsa <>,
        Alexei Starovoitov <>,
        Andrii Nakryiko <>,
        Daniel Borkmann <>,
        Andrii Nakryiko <>,,, lkml <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        John Fastabend <>,
        KP Singh <>,
        Steven Rostedt <>,
        "Naveen N . Rao" <>,
        Anil S Keshavamurthy <>,
        "David S . Miller" <>
Subject: Re: [PATCH v13 bpf-next 1/1] rethook: x86: Add rethook x86

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?

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