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From: Jiri Olsa <jolsa@redhat.com>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>,
	David Ahern <dsahern@gmail.com>,
	Namhyung Kim <namhyung@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: [BUG] perf probe can't insert return kprobe
Date: Fri, 9 Jan 2015 15:55:39 +0100	[thread overview]
Message-ID: <20150109145539.GC14750@krava.brq.redhat.com> (raw)

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


thanks,
jirka

             reply	other threads:[~2015-01-09 14:55 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-09 14:55 Jiri Olsa [this message]
2015-01-09 15:03 ` [BUG] perf probe can't insert return kprobe Arnaldo Carvalho de Melo
2015-01-09 15:06   ` David Ahern
2015-01-09 15:04 ` David Ahern
2015-01-09 15:21 ` Namhyung Kim
2015-01-09 15:25   ` David Ahern
2015-01-09 15:30   ` Jiri Olsa
2015-01-09 15:44     ` Jiri Olsa
2015-01-10  9:51       ` Namhyung Kim
2015-01-12 11:00         ` Masami Hiramatsu

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