From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757681AbbAIPEo (ORCPT ); Fri, 9 Jan 2015 10:04:44 -0500 Received: from mail-pd0-f171.google.com ([209.85.192.171]:64320 "EHLO mail-pd0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757340AbbAIPEm (ORCPT ); Fri, 9 Jan 2015 10:04:42 -0500 Message-ID: <54AFEE06.1070000@gmail.com> Date: Fri, 09 Jan 2015 08:04:38 -0700 From: David Ahern User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: Jiri Olsa , Masami Hiramatsu CC: Arnaldo Carvalho de Melo , Namhyung Kim , linux-kernel@vger.kernel.org Subject: Re: [BUG] perf probe can't insert return kprobe References: <20150109145539.GC14750@krava.brq.redhat.com> In-Reply-To: <20150109145539.GC14750@krava.brq.redhat.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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