Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762297Ab2FVPSj (ORCPT ); Fri, 22 Jun 2012 11:18:39 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:36186 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758421Ab2FVPSi (ORCPT ); Fri, 22 Jun 2012 11:18:38 -0400 Message-ID: <4FE48CCA.2050506@gmail.com> Date: Fri, 22 Jun 2012 09:18:34 -0600 From: David Ahern User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 MIME-Version: 1.0 To: Namhyung Kim CC: Peter Zijlstra , Arnaldo Carvalho de Melo , Paul Mackerras , Ingo Molnar , LKML , Jiri Olsa Subject: Re: [RFC/PATCHSET 0/8] perf tools: Minimal build without libelf dependency (v2) References: <1340343462-15556-1-git-send-email-namhyung@kernel.org> <1340358478.18025.51.camel@twins> <1340377510.1478.10.camel@leonhard> In-Reply-To: <1340377510.1478.10.camel@leonhard> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1358 Lines: 34 On 6/22/12 9:05 AM, Namhyung Kim wrote: > Hi Peter, > > 2012-06-22 (금), 11:47 +0200, Peter Zijlstra: >> On Fri, 2012-06-22 at 14:37 +0900, Namhyung Kim wrote: >>> And then I realized that the perf record needs to know about the >>> build-id's anyway. :( So I implemented a poor man's version of elf >>> parser only for parsing the build-id info. >> >> Why? the very first versions didn't know about any of that nonsense :-) >> It works just fine as long as you don't go change binaries around. >> >> That said, you did the work already, so no objection, just saying >> builtids aren't that important. > > I'm not sure I understood you correctly. But 'perf record' needs to know > about the build-id's to save them to perf.data for 'perf report' later. > And 'perf archive' also needs to know about them to select necessary > binaries for the session. > And build-id's are not required for report (-B option for record). Also, the intent is for a small footprint binary for embedded systems. On such a system I would expect binaries and libraries to be stripped, so no point in running perf-archive. David -- 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/