Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752832Ab2HZRxj (ORCPT ); Sun, 26 Aug 2012 13:53:39 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:33983 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751087Ab2HZRxi (ORCPT ); Sun, 26 Aug 2012 13:53:38 -0400 Message-ID: <503A6273.9090702@fb.com> Date: Sun, 26 Aug 2012 10:52:51 -0700 From: Arun Sharma User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: Peter Zijlstra CC: LKML , Jiri Olsa , Arnaldo Carvalho de Melo , Benjamin Redelings , Corey Ashford , Cyrill Gorcunov , "Frank Ch. Eigler" , Frederic Weisbecker , Ingo Molnar , Masami Hiramatsu , Paul Mackerras , Robert Richter , Stephane Eranian , Tom Zanussi , Ulrich Drepper Subject: Re: perf backtraces off-by-1 References: <5037FC9F.3090603@fb.com> <1345997415.2296.0.camel@laptop> In-Reply-To: <1345997415.2296.0.camel@laptop> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.18.252] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.7.7855,1.0.428,0.0.0000 definitions=2012-08-26_07:2012-08-24,2012-08-26,1970-01-01 signatures=0 X-Proofpoint-Spam-Reason: safe Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 866 Lines: 25 On 8/26/12 9:10 AM, Peter Zijlstra wrote: > On Fri, 2012-08-24 at 15:13 -0700, Arun Sharma wrote: > >> One option is to support >> this for user mode only, with code to detect signal frames. Any other >> ideas? >> > I guess we'd need to see what that patch would look like... :-) > It used to look like this: http://git.savannah.gnu.org/gitweb/?p=libunwind.git;a=commitdiff;h=92cc7fd78a5a79c4bb5f85bfb7d7fb025df9cd5a These days we just look at dwarf augmentation string: http://git.savannah.gnu.org/gitweb/?p=libunwind.git;a=blob;f=src/dwarf/Gfde.c;h=8659624b0320c514057861a259b6efe1b605bbf3;hb=HEAD#l189 -Arun -- 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/