From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756898AbbJATK4 (ORCPT ); Thu, 1 Oct 2015 15:10:56 -0400 Received: from pandora.arm.linux.org.uk ([78.32.30.218]:60699 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755587AbbJATKy (ORCPT ); Thu, 1 Oct 2015 15:10:54 -0400 Date: Thu, 1 Oct 2015 20:10:41 +0100 From: Russell King - ARM Linux To: Drew Richardson Cc: will.deacon@arm.com, a.p.zijlstra@chello.nl, mingo@redhat.com, acme@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wade.cherry@arm.com, pawel.moll@arm.com Subject: Re: [PATCH] arm: perf: Fix userspace call stack walking Message-ID: <20151001191041.GY21513@n2100.arm.linux.org.uk> References: <20151001172643.GA23147@dreric01-gentoo.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151001172643.GA23147@dreric01-gentoo.localdomain> 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 On Thu, Oct 01, 2015 at 10:26:47AM -0700, Drew Richardson wrote: > The layout of stack frames has changed over time. Testing using a > arm-linux-gnueabi gcc-4.2 from 2007 the original code didn't work but > this new code does. It also works with clang as well as newer versions > of gcc. Can you point to a modern ARM distribution where perf actually works with calltraces into userspace? -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.