linux-kernel - Re: [PATCH v5 00/12] tracing: fprobe: rethook: Use ftrace_regs instead of pt

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Message-ID: <CAADnVQ+HCLx+QUE88uVxeBNYFY4D=2-HADOU1C_czT1S1sRHgA@mail.gmail.com>
Date:   Fri, 29 Sep 2023 17:12:07 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Florent Revest <revest@...omium.org>,
        linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alan Maguire <alan.maguire@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Guo Ren <guoren@...nel.org>
Subject: Re: [PATCH v5 00/12] tracing: fprobe: rethook: Use ftrace_regs
 instead of pt_regs

On Thu, Sep 28, 2023 at 6:21 PM Masami Hiramatsu <mhiramat@...nel.org> wrote:
>
>
> Thus, what I need is to make fprobe to use function-graph tracer's shadow
> stack and trampoline instead of rethook. This may need to generalize its
> interface so that we can share it between fprobe and function-graph tracer,
> but we don't need to involve rethook and kretprobes anymore.

...

> And need to add patches
>
>  - Introduce a generized function exit hook interface for ftrace.
>  - Replace rethook in fprobe with the function exit hook interface.

you mean that rethook will be removed after that?