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

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Message-ID: <54AFEE58.8060609@gmail.com>
Date:	Fri, 09 Jan 2015 08:06:00 -0700
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
CC:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.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 8:03 AM, Arnaldo Carvalho de Melo wrote:
> Em Fri, Jan 09, 2015 at 03:55:39PM +0100, Jiri Olsa escreveu:
>> 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.
>
> Wonder if we have any way of forcing 'perf probe' to show what it will
> feed the kernel, perhaps -v?

# strace -e write perf probe -a fork_exit=do_fork%return
write(1, "Added new event:\n", 17Added new event:
)      = 17
write(3, "r:probe/fork_exit do_fork+0", 27) = 27

Would be nice to add the output to perf -v though.

David
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