From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756714Ab1DFWPt (ORCPT ); Wed, 6 Apr 2011 18:15:49 -0400 Received: from mail-pv0-f174.google.com ([74.125.83.174]:33328 "EHLO mail-pv0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756179Ab1DFWPs (ORCPT ); Wed, 6 Apr 2011 18:15:48 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; b=OEvhHWxd2PSdODfpwcuRJT4WYAhj0/4uIjkmzACgXweNR8GZvVkPG1oWNuaCcwifKm IACFtp2OPN/JziQ12kHbuv+ZWD96rpn5vQOa1Y2QoQX5aw61LLWjCmSUaQEZ9RpmIXx/ FemNJRUeLzAcOpcv5j9kOj3mrXTQ/c5+raIh0= Message-ID: <4D9CE610.4020603@gmail.com> Date: Wed, 06 Apr 2011 16:15:44 -0600 From: David Ahern User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110307 Fedora/3.1.9-0.39.b3pre.fc14 Thunderbird/3.1.9 MIME-Version: 1.0 To: Tim Blechmann CC: Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org Subject: Re: [2.6.39-rc2] perf top fails to mmap References: <4D9C84D5.6090303@gmail.com> <20110406175217.GC4987@ghostprotocols.net> <201104062248.23853.tim@klingt.org> In-Reply-To: <201104062248.23853.tim@klingt.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/06/11 14:48, Tim Blechmann wrote: >>> David >>> >>>> this happens when running perf as the same process as the process and >>>> when running perf as root. >> >> yep, works for me as well: >> >> [acme@emilia ~]$ cat vsyscall.c > > after including unistd.h, this compiles and works fine. however i cannot profile > any multithreaded program. does this work for you? > > tim > That does fail: # ps -C rsyslogd -L PID LWP TTY TIME CMD 795 795 ? 00:00:00 rsyslogd 795 797 ? 00:00:00 rsyslogd 795 798 ? 00:00:00 rsyslogd # /tmp/build-perf/perf top -p 795 Failed to mmap with 22 (Invalid argument) strace shows it failing at: ioctl(4, PERF_EVENT_IOC_SET_OUTPUT, 0x3) = -1 EINVAL (Invalid argument) Changing to use thread only works: # /tmp/build-perf/perf top -t 795