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

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Message-ID: <20150109153056.GB4136@krava.brq.redhat.com>
Date:	Fri, 9 Jan 2015 16:30:56 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [BUG] perf probe can't insert return kprobe

On Sat, Jan 10, 2015 at 12:21:13AM +0900, Namhyung Kim wrote:
> On Fri, Jan 09, 2015 at 03:55:39PM +0100, 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
> > 
> 
> Is it just return probe?  Did it work for normal kprobes?

yep, works for normal probes

> Maybe it's related to the below:
> 
> https://lkml.org/lkml/2014/12/31/15
> 
> Have you check the acme/perf/urgent too?

hum.. can't access lkml, I'll check, also with perf/urgent

thanks,
jirka
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