linux-kernel - Re: [BUG] perf probe can't insert return kprobe

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Date:	Fri, 09 Jan 2015 08:04:38 -0700
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] perf probe can't insert return kprobe

On 1/9/15 7:55 AM, Jiri Olsa wrote:
> hi,
> I couldn't use following perf command to insert return probe:
>
>    # perf probe -a fork_exit=do_fork%return
>    Added new event:
>    Failed to write event: Invalid argument
>      Error: Failed to add events.
>
>
> I'm pretty sure I used this command before, so seems like
> it's broken. I can still use debugfs tracing interface to
> do that:
>    # echo 'r:do_fork_entry do_fork' > kprobe_events
>
> I used Arnaldo's latest perf/core and FC20 kernel:
>
>    # uname -a
>    Linux krava 3.17.7-200.fc20.x86_64 #1 SMP Wed Dec 17 03:35:33 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
>    # ./perf version
>    perf version 3.18.g6a7d78
>

If you want to bisect it the perf-probe command works for me on FC20, 
3.17.7-200.fc20.x86_64 with perf from 3.12 (my local modified version is 
based on 3.12).

David

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