Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933293Ab0KQMvo (ORCPT ); Wed, 17 Nov 2010 07:51:44 -0500 Received: from casper.infradead.org ([85.118.1.10]:54759 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752507Ab0KQMvn convert rfc822-to-8bit (ORCPT ); Wed, 17 Nov 2010 07:51:43 -0500 Subject: Re: [ANNOUNCE] New utility: 'trace' From: Peter Zijlstra To: =?ISO-8859-1?Q?T=F6r=F6k?= Edwin Cc: Thomas Gleixner , LKML , Linus Torvalds , Andrew Morton , Ingo Molnar , Steven Rostedt , Arjan van de Ven In-Reply-To: <20101117144758.38bf4f05@deb0> References: <20101117144758.38bf4f05@deb0> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Wed, 17 Nov 2010 13:51:52 +0100 Message-ID: <1289998312.2109.745.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 801 Lines: 17 On Wed, 2010-11-17 at 14:47 +0200, Török Edwin wrote: > I see --call-graph in the trace record -h output, but it doesn't seem > to work on x86_64 for me. If you want to unwind userspace you need to build everything with framepointers -- sadly some people have been lobbying to remove framepointers from all distro builds, even though on x86_64 its nearly free (i386 does have a significant performance benefit, sadly). There's some work on-going to simply copy out the top of stack and let dwarves go wild at it in userspace, but that isn't done yet. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/