Re: [PATCH] kprobes: Print an error if probe is rejected

From: Steven Rostedt
Date: Thu Jun 10 2021 - 13:33:50 EST

On Thu, 10 Jun 2021 19:16:43 +0900
Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:

> Hmm, Nack for this way, but I understand that is a problem.
> If you got the error in perf probe, which uses ftrace dynamic-event interface.
> In that case, the errors should not be output in the dmesg, but are reported
> via error_log in tracefs.
> And kprobes itself should return different error code to the caller, instead
> of printing error in dmesg. See below.

We should update perf to use libtracefs that also has an interface to
read the error_log file.

-- Steve