linux-kernel - Re: Update objtrace usage in Documentation/trace/events.rst

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Message-ID: <CAEr6+EB=zLULsL7whcS1aaCjctec2iasQ2+B1NXDxMXEKkTBoQ@mail.gmail.com>
Date:   Tue, 31 Oct 2023 11:06:22 +0800
From:   Jeff Xie <xiehuan09@...il.com>
To:     renhai_lenovo <kean0048@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, bagasdotme@...il.com,
        "corbet@....net" <corbet@....net>
Subject: Re: Update objtrace usage in Documentation/trace/events.rst

Hi renhai,

On Tue, Oct 31, 2023 at 10:46 AM renhai_lenovo <kean0048@...il.com> wrote:
>
> Documentation: trace/objtrace: Move the line entering the trace
> directory to the first step, so that the commands in the first step
> can be executed smoothly.
>
>     Signed-off-by: Renhai <rh_king@....com>
>
> diff --git a/Documentation/trace/events.rst b/Documentation/trace/events.rst
> index 52ac8ca8ab64..d5fadf7966de 100644
> --- a/Documentation/trace/events.rst
> +++ b/Documentation/trace/events.rst
> @@ -583,6 +583,7 @@ The following commands are supported:
>
>    .. code-block::
>
> +    # cd /sys/kernel/debug/tracing/
>       # echo 'p bio_add_page arg1=$arg1' > ./kprobe_events
>
>    Secondly, we can get the value dynamically based on the object:
> @@ -597,7 +598,6 @@ The following commands are supported:
>       # echo 'objtrace:add:arg1,0x28:u32:1 if comm == "cat"' >
> ./events/kprobes/ \
>         p_bio_add_page_0/trigger
>
> -     # cd /sys/kernel/debug/tracing/
>       # echo 'p bio_add_page arg1=$arg1' > ./kprobe_events
>       # echo 'objtrace:add:arg1,0x28:u32:1 if comm == "cat"' >
> ./events/kprobes/p_bio_add_page_0/trigger

Thank you for your interest in the objtrace function. I am currently
busy with other things.
I will come back soon to update this function. When I update it, I
will add your suggestions.

-- 
Thanks,
JeffXie