From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752966AbbBAOKU (ORCPT ); Sun, 1 Feb 2015 09:10:20 -0500 Received: from mail.kernel.org ([198.145.29.136]:52906 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750825AbbBAOKS (ORCPT ); Sun, 1 Feb 2015 09:10:18 -0500 Date: Sun, 1 Feb 2015 11:10:25 -0300 From: Arnaldo Carvalho de Melo To: Sukadev Bhattiprolu Cc: Jiri Olsa , linux-kernel@vger.kernel.org, zhlbj@cn.ibm.com Subject: Re: perf_evlist__filter_pollfd() in trace__run() Message-ID: <20150201141025.GG3101@kernel.org> References: <20150129235522.GA14385@us.ibm.com> <20150130152216.GE3101@kernel.org> <20150130201611.GA13679@us.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150130201611.GA13679@us.ibm.com> X-Url: http://acmel.wordpress.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 Em Fri, Jan 30, 2015 at 12:16:11PM -0800, Sukadev Bhattiprolu escreveu: > Arnaldo Carvalho de Melo [acme@kernel.org] wrote: > | Em Thu, Jan 29, 2015 at 03:55:22PM -0800, Sukadev Bhattiprolu escreveu: > | > Should there be another check to before reading the mmap again ? > | > | Possibly, checking, but a similar algorithm should be in place for > | 'record', do you see any problems there? I.e. with 'perf record sleep > | 1'? > > No, I don't see the failure with perf record in several hundred attempts. > (both the distro and latest perf-core versions work ok). Ok, so its a matter of comparing what both are doing, will try. > | > I must add that I don't get the SIGSEGV on recent perf-core and the > | > system where we get the crash, first runs into the following > | > errors that we are still looking into (maybe related to "ppc64le" > | > architecture). > > With recent perf core I did not get the SIGSEGV (or the syscall translation > failures below) on a different system. > > But on this system, a power KVM guest, I get both errors even with latest > perf core (commit c52686f9f88). > > | > > | > Problems reading syscall 45 information > | > Problems reading syscall 5 information > | > Problems reading syscall 5 information > | > Problems reading syscall 108 information > | > Problems reading syscall 108 information > | > Problems reading syscall 90 information > | > Problems reading syscall 90 information > | > Problems reading syscall 6 information > | > > | > Unlike the SIGSEGV, these errors occur always. > > Most likely this syscall number translation is due to the > > https://fedorahosted.org/audit/browser/trunk/lib/machinetab.h > > missing this change set 1013, which added support for ppc64le. We have to improve that message to mention that perhaps a newer audit-libs package is required. - Arnaldo