From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753829Ab2CCPTS (ORCPT ); Sat, 3 Mar 2012 10:19:18 -0500 Received: from mail-yx0-f174.google.com ([209.85.213.174]:50452 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752666Ab2CCPTR (ORCPT ); Sat, 3 Mar 2012 10:19:17 -0500 Authentication-Results: mr.google.com; spf=pass (google.com: domain of arnaldo.melo@gmail.com designates 10.236.78.201 as permitted sender) smtp.mail=arnaldo.melo@gmail.com; dkim=pass header.i=arnaldo.melo@gmail.com Date: Sat, 3 Mar 2012 12:19:12 -0300 From: Arnaldo Carvalho de Melo To: David Ahern Cc: LKML , Ingo Molnar Subject: Re: perf_guest default bug Message-ID: <20120303151912.GD16301@infradead.org> References: <4F5118B1.5070406@gmail.com> <20120303140405.GB16301@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120303140405.GB16301@infradead.org> X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Em Sat, Mar 03, 2012 at 11:04:05AM -0300, Arnaldo Carvalho de Melo escreveu: > Em Fri, Mar 02, 2012 at 12:00:01PM -0700, David Ahern escreveu: > > Similar to my last email, this patch is not in urgent trees or > > Linus' yet the problem exists in Linus' tree: > > https://lkml.org/lkml/2012/2/17/82 > > > > $ /tmp/pbuild/perf record -a -- sleep 1 > > [ perf record: Woken up 1 times to write data ] > > [ perf record: Captured and wrote 0.319 MB perf.data (~13935 samples) ] > > Segmentation fault > > > > Root cause is the perf_guest setting. > > > > $ /tmp/pbuild/perf --version > > perf version 3.3.rc5.60.g203738 > > This one was tricky, IIRC, weren't follow up patches needed to plug some > extra problems? Yeah, just trying cherry picking it and trying it on an RHEL6.2 kernel and it didn't work because older kernels don't have attr.exclude_{guest,host}, so I had to also cherrypick: [acme@sandy linux]$ git cherry-pick 0c9781280fb672ca09c997df3f14ba506bbdb977 Finished one cherry-pick. [perf/urgent b5f81a4] perf tools: Handle kernels that don't support attr.exclude_{guest,host} - Arnaldo