From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757247AbbAIPVY (ORCPT ); Fri, 9 Jan 2015 10:21:24 -0500 Received: from mail-pd0-f175.google.com ([209.85.192.175]:43498 "EHLO mail-pd0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753255AbbAIPVX (ORCPT ); Fri, 9 Jan 2015 10:21:23 -0500 Date: Sat, 10 Jan 2015 00:21:13 +0900 From: Namhyung Kim To: Jiri Olsa Cc: Masami Hiramatsu , Arnaldo Carvalho de Melo , David Ahern , linux-kernel@vger.kernel.org Subject: Re: [BUG] perf probe can't insert return kprobe Message-ID: <20150109152113.GA29697@danjae> References: <20150109145539.GC14750@krava.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20150109145539.GC14750@krava.brq.redhat.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? Maybe it's related to the below: https://lkml.org/lkml/2014/12/31/15 Have you check the acme/perf/urgent too? Thanks, Namhyung